61 results about "Carbon dioxide low" patented technology

The invention discloses a biomass gasification hydrogen-producing system and a method, which belongs to the technical field of hydrogen production. Biomass gasification hydrogen production and chemical-looping combustion are combined to realize low-cost separation of carbon dioxide; and the fractional utilization of matter and energy is realized via the circulation among three beds with metal oxide as a heat carrier and an oxygen carrier. The system mainly comprises an air reactor, a fuel reactor, a moving bed gasifier, a gas-solid separation device, a gas purification device, a hydrogen separation device and a follow-up hydrogen-producing device. The system not only can realize hydrogen production, but also can realize hydrogen production with near zero emission of CO2, thereby realizing efficient cleaning and utilization of biomass.

The feasibility of using CO2 from a concentrated source to grow microalgae is limited by the high cost of CO2 capture and transportation, as well as significant CO2 loss during algae culture. Another challenge is the inability of algae in using CO2 during night while CO2 is continuously produced from the source. To address these challenges, this invention provides a process in which CO2 is captured as bicarbonate and used as feedstock for algae culture. Then the carbonate is regenerated in the algae culture process as absorbent to capture more CO2, which is converted to bicarbonate for use as feedstock, etc. This process significantly reduces carbon capture costs since it avoids the energy for carbonate regeneration. Also, transporting a solid or aqueous bicarbonate solution has a much lower cost than transporting compressed CO2, and using bicarbonate provides a better alternative for CO2 delivery to algae culture systems than supplying CO2 gas.

The two-stage CO2 low-temp. refrigerating equipment is characterized by that its low-temp. jet pump is connected with gas-liquid-solid three-phase separator, the gas-liquid-solid three-phase separator is respectively connected with heat regenerator, circulating pump and user's heat exchanger. The outlet state of the low-temp. jet pump is three-phase point of CO2, and the fluid of outlet is a gas-liquid-solid three-phase coexisting mixture, said low-temp. jet pump can be made into monounit together with gas-liquid-solid three-phase separator, so that it can make the solid microparticle diameter of CO2 formed after isenthalpic decompression of liquid separated from intermediate gas-liquid be very small, the circulating pump can be used for transferring solid-liquid two-phase mixture into user's heat exchanger, and can utilize the crilical hidden heat produced by converting CO2 solid-phase micropartide into liquid phase to release cold quantity.

The invention discloses a low-temperature hydrogen purification device which comprises a catalytic deoxidization device, a normal-temperature adsorption device, a low-temperature heat exchange device and a low-temperature adsorption device. Deoxidization is performed on crude hydrogen by the catalytic deoxidization device, the crude hydrogen is cooled to reach normal temperature by the catalytic deoxidization device, the normal-temperature adsorption device is used for adsorbing nitrogen in the crude hydrogen, the low-temperature heat exchange device is used for cooling the crude hydrogen, and the low-temperature adsorption device is used for adsorbing the nitrogen in the crude hydrogen. A gas inlet of the catalytic deoxidization device is connected with the crude hydrogen, a gas outlet of the catalytic deoxidization device is sequentially connected with the normal-temperature adsorption device, the low-temperature heat exchange device and the low-temperature adsorption device through pipelines, the normal-temperature adsorption device further can adsorb water and carbon dioxide in the crude hydrogen, and the low-temperature adsorption device further can adsorb micro-oxygen in the crude hydrogen. The invention further discloses a control method of the low-temperature hydrogen purification device. The low-temperature hydrogen purification device can obtain hydrogen with higher purity and better quality by the aid of tertiary purification technology, and the purification device further has the advantages of low operating cost, less equipment investment, convenience in operation, simplicity and convenience in maintenance and high reliability.

The invention relates to a low-energy consumption device for trapping carbon dioxide in tail gas of an LNG power plant. The low-energy consumption device comprises a LNG cold energy recycling system,a gas hydrate forming system and a gas hydrate decomposing system. According to the low-energy consumption device, the CO2 in flue gas is separated and trapped through the use of a large amount of cold energy released in the LNG gasifying process of a gas-fired power plant and through combination with a way of hydrate formation, a tray-type hydrate forming tower can achieve continuous separation of hydrate, a gas heat exchange-type hydrate decomposing device can fully utilize afterheat of the flue gas for decomposing the hydrate, and the CO2 is sealed up for safekeeping. The low-energy consumption device fully utilizes LNG cold energy and the afterheat of the flue gas, achieves continuous separation of the flue gas, seals up the CO2 for safekeeping to reduce CO2 emission, plays a positiverole in relieving the greenhouse effect, and is not affected by seasonal and environmental changes and has a great practical application value.

The invention provides a heavy oil reservoir cold recovery method adopting carbon dioxide energy storage and high pressure viscosity reduction. The heavy oil reservoir cold recovery method comprises the steps that carbon dioxide is injected into a heavy oil reservoir to accumulate energy for a stratum and initial viscosity reduction is carried out to crude oil; and a high-efficiency cold-recoveryviscosity-reducing agent is used to achieve further viscosity reduction of heavy oil in a carbon dioxide low-temperature effect environment, interfacial tension is reduced, colloids and asphaltene precipitated from the heavy oil are dissolved, thus mobility of underground heavy oil is improved, driving power of the crude oil is increased, and the degree of exploitation of the heavy oil reservoir is improved. According to the heavy oil reservoir cold recovery method adopting carbon dioxide energy storage and high pressure viscosity reduction, the improvement of the reservoir energy of heavy oilreservoirs and the improvement of the flowability of underground crude oil are realized, and the cold damage effect caused by the precipitation of the colloids and the asphaltene by the low-temperature effect during the heavy oil cold recovery process is reduced, thereby greatly improving the degree of reserve utilization of the heavy oil reservoirs.

The invention discloses a processing technique of liquid carbon dioxide by decarbonizing and resolving synthetic ammonia, relating to the technical field of synthetic ammonia production and processing. The technique comprises the following steps: desulfurization, drying and dewatering, condensation, purification, dealkylation and rectification purification. According to the technique disclosed by the invention, the liquid carbon dioxide recovery integrates the characteristics of carbon dioxide low-pressure deep freezing and rectification; and a medium-pressure process is utilized to produce the liquid carbon dioxide and separate the impurities with lower boiling point than the carbon dioxide, and impurities which have higher boiling point than the carbon dioxide and can not be separated by rectification are specifically removed. The synthetic ammonia PSA decarbonization CO2-containing bleed air is recovered to prepare the high-purity liquid industrial-grade carbon dioxide and liquid food-grade carbon dioxide, thereby reducing the emission of greenhouse gases, enhancing the productivity of industrial gases of the local area, greatly lowering the energy consumption and cost of the synthetic ammonia product, and enhancing the economic benefits of the enterprises and the environmental protection of the local area.

The invention discloses a carbon dioxide low-temperature Rankine cycle power generation system. According to the power generation system, carbon dioxide is adopted as a cycle working medium, environment air is adopted as a heat source, the pressure of high-pressure liquid-state LNG is reduced in the use process, the temperature of the high-pressure liquid-state LNG is reduced to -162 DEG C, and therefore a cold source environment is formed; and the carbon dioxide discharged by a turbine is cooled to a liquid state in a condenser by the low-temperature LNG, after being pressurized by a workingmedium pump, the carbon dioxide absorbs heat from the environment to the heat state, and then the carbon dioxide enters the turbine to act to drive a motor to generate power. The system has the advantages that the temperature of a cold source is low, the environment is adopted as the heat source, and wasted work of the working medium pump is small; and the environment air is directly adopted as the heat source, and no extra energy is needed to be consumed for providing heat for the power generation system.

A method for brewing grape wine by low temperature dipping through carbon dioxide comprises the following steps: raw material treatment: selecting ripe grape berries without diseases, conveying the grape berries through a conveying belt, carrying out ultraviolet sterilization treatment on the grape berries and then placing the grape berries in a fermenting tank; low temperature dipping through carbon dioxide: before the raw materials are placed in the fermenting tank, enabling the fermenting tank to be filled with the carbon dioxide through a conveying tube, while the grape berries are placed in the fermenting tank, reducing the temperature to be 3-10 DEG C in a mode of continuing filling the carbon dioxide in the fermenting tank, and maintaining the temperature in the fermenting tank at the temperature of 3-10 DEG C for 5-7 days; and after low temperature dipping through the carbon dioxide is finished, heating the fermenting tank, and then inoculating yeast to begin to ferment and brew wine. When the grape wine is brewed by the method, even if the grapes are damaged, the expected effect can be achieved in the dipping process through the carbon dioxide.

The invention discloses a high pressure gas vortex expanded low temperature refrigerating system, and provides a system for reducing pressure by virtue of vortex expansion. The high pressure gas vortex expanded carbon dioxide low temperature refrigerating system is characterized in that a vortex pipe comprises a vortex chamber, a cold section and a hot pressure expanding section, and the center of a bottom plate of the hot pressure expanding section is provided with a center baffle enabling cold gas in a center region to go back towards the cold section; the outlet of a high-pressure stage compressor is connected with the inlet of a gas cooler, and the outlet of the gas cooler is connected with a high-pressure gas inlet connecting pipe; one of cold gas outlet connecting pipes of the cold section is connected in parallel with a collected saturation liquid outlet connecting pipe and then is connected with the inlet of an evaporator, the other cold gas outlet connecting pipe is connected with a heat exchanger low temperature cold gas inlet connecting pipe, and a heat exchanger low temperature cold gas outlet is connected in parallel with the outlet of the evaporator and then is connected with the inlet of a low-pressure stage compressor; the outlet of the low-pressure stage compressor is connected in parallel with a heat exchanger high temperature hot gas outlet and then is connected with the inlet of the high-pressure stage compressor, and a hot gas outlet connecting pipe is connected with a heat exchanger high temperature hot gas inlet. The irreversible loss high pressure gas vortex expanded carbon dioxide low temperature refrigerating system provided by the invention is reduced by virtue of depressurization with vortex expansion.

The invention provides an oxygen cabin type gym air-conditioning system and a working method thereof. The oxygen cabin type gym air-conditioning system comprises an oxygen cabin type gymnasium, a central air-conditioning new air supplying main air channel, an air source purifying system, an air sterilization filtering device, an oxygen generator, an oxygen supplying device, a carbon dioxide lower air suction system and a negative oxygen ion generator. When an oxygen measuring instrument measures that oxygen content in the gymnasium is smaller than or equal to 22%, the oxygen generator starts to work to deliver oxygen into the gymnasium. When the oxygen measuring instrument measures that oxygen content in the gymnasium is greater than or equal to 30%, the oxygen generator does not work. When a carbon dioxide measuring instrument measures that CO2 content in the gymnasium is smaller than or equal to 3%, the carbon dioxide lower air suction system does not work. When the carbon dioxide measuring instrument measures that the CO2 content in the gymnasium is greater than or equal to 3%, greater than or equal to 5% or greater than or equal to 6%, an exhaust fan of the carbon dioxide lower air suction system respectively work at a low gear, a middle gear and a high gear. The oxygen cabin type gym air-conditioning system has the advantages of being reasonable in structure, simple in operating step, economic in cost and strong in practical applicability, thoroughly changes air property in the gymnasium and further changes physical function of a sporter.

The invention belongs to the technical field of beverage processing and relates to a preparation method of a Gewasi beverage. The preparation method comprises the following steps of preparing a wort fermentation broth and a breadcrumb fermentation broth, carrying out isometric mixing of the wort fermentation broth and the breadcrumb fermentation broth, and carrying out filtration, disinfection, blending and carbon dioxide-filling low-temperature pressure-maintaining loading. The preparation method urilizes lactobacillus bulgaricus and beer yeast to ferment a barley malt saccharified liquid and a bread saccharified liquid. The lactobacillus bulgaricus and beer yeast ferment are respectively under optimal conditions so that a fermentation rate is fast and a mouthfeel is good. Compared with preparation methods of the traditional Russian Gewasi beverages, the preparation method provided by the invention has the advantages of stable batch product quality, difficult bacterial infection, low cost, convenient operation and industrial production easiness.

The invention discloses an automatic atmosphere control element and a fruit atmosphere control preservation method thereof, wherein the box bottom, the box wall and a box cover of an atmosphere control box are provided with at least one air hole respectively. Firstly, at least one first long atmosphere control element and one second long atmosphere control element, and a short atmosphere control element are soaked in a liquid, the atmosphere control elements are arranged in the air holes of the atmosphere control box filled with fruits, and the short atmosphere control element is completely plugged into the air hole of the box bottom of the atmosphere control box; one to all the first long atmosphere control elements and the second atmosphere control elements are inserted into a part of the box wall of the atmosphere control box, side holes are exposed, and an atmosphere control instrument is used to introduce carbon dioxide gas into the atmosphere control box; and the atmosphere control box is closed for 20 to 30 hours, and the fruits in the atmosphere control box are preserved in the carbon dioxide gas. The automatic atmosphere control element can perform full-range regulation preservation on the whole circulation area of storage, transportation, and sales of the fruits and so on. The aim of fruit preservation with high carbon dioxide, low oxygen and low temperature can be realized by arranging the automatic atmosphere control element on the atmosphere control box and adopting a novel atmosphere control method combined with automatic atmosphere control and spontaneous atmosphere control.

The invention provides a skid-mounted natural gas liquefaction and purification integrated cold box. The skid-mounted natural gas liquefaction and purification integrated cold box comprises a natural gas supercooling heat exchanger, a natural gas unit, a gas-phase refrigerant unit and a recooling unit, wherein the gas-phase refrigerant unit is used for cooling natural gas in the natural gas unit; the recooling unit is used for making a liquid-phase refrigerant and a gas-phase refrigerant be mixed to form a mixed refrigerant, cooling the gas-phase refrigerant subjected to heat exchange, and returning part of the mixed refrigerant to a natural gas precooling heat exchanger and a gas-phase refrigerant precooling heat exchanger; and the other part of the mixed refrigerant flows back to a liquid-phase refrigerant heat exchanger. The skid-mounted natural gas liquefaction and purification integrated cold box has the following beneficial effects that soldered plate heat exchangers are used as the heat exchangers in the cold box; and meanwhile, a carbon dioxide low-temperature separator is integrated in the cold box, carbon dioxide is separated out through a low-temperature separation method, and thus the equipment investment and operating cost of a natural purification device are greatly reduced. Furthermore, efficient cold distribution is achieved through reasonable refrigerant flow distribution, so that the cold box is made to have high thermodynamic efficiency, and the exergy loss in the heat exchange process is reduced.

The invention belongs to the technical field of edible mushroom culturing, and discloses an industrialized bottle-type culturing method of pleurotus ostreatus. The method comprises the steps of adopting 850-1,400 ml polyethylene plastic bottles, wherein each bottle is filled with 0.19-0.33kg of dryer, the temperature in a culture room is 20 DEG C-22 DEG C, the relative air humidity is controlled to be 70%, and lucifugal culturing is conducted for 28-30 days under a dark condition; removing the bottle lids, controlling the temperature to be 15-17 DEG C, controlling the relative air humidity to be 85-90%, giving 100lx-300lx scattering light, keeping the air fresh, making the concentration of carbon dioxide lower than 0.06%, sustaining the condition for 7-10 days, and conducting harvesting when pleurotus ostreatus caps of sporophores grow to 3-4 centimeters. According to the industrialized bottle-type culturing method of the pleurotus ostreatus, industrialized daily production of pleurotus ostreatus can be achieved, and the safety of the product is guaranteed. In the meanwhile, the biological efficiency is sharply improved, and the first-cut mushroom biological efficiency reaches 40-64%. The mushroom fruiting uniformity is good, and it is guaranteed that 100% culture bottles fruit pleurotus ostreatus simultaneously.

The low temperature CO2 pyrethrin extracting process includes crushing pyrethrum to 20-100 mesh, extraction in CO2 liquid for 1.5-2.5 hr first at 0-25 deg.c and 5-15 MPa and then at 5-40 deg.c and 3-13 MPa, and recovering CO2 for reuse. The process of the present invention has high extractive purity, low production cost and high extraction efficiency in despite of its total yield lower than that of supercritical extraction process.

The invention discloses a process for preparing methanol from carbon dioxide based on a low-temperature plasma hydrogenation method, comprising the following steps: premixing; preheating, wherein the heating temperature is 15-50 DEGC; reaction, wherein the premixed materials are guided into a DBD (Dielectric Barrier Discharge) integrated reactor for reaction; separation, wherein products obtained after the reaction, including methanol, water and unreacted carbon dioxide and hydrogen, are separated in a separation unit; and purification, wherein pure methanol enters a product tank in liquid form. The process disclosed by the invention has the following advantages and beneficial effects: first, carbon dioxide can be efficiently converted into the methanol, and clean energy such as solar energy and the like can be selected as a driving energy; second, the reaction can be completed in a condition close to a room temperature, and has the characteristics of moderate reaction condition, high carbon dioxide conversion efficiency, low requirement for equipment and lower cost; third, a lot of optical radiation will be produced in the process of gas discharge, and can be utilized effectively when DBD is used in cooperation with a catalyst, and therefore conversion of the carbon dioxide is greatly promoted.

The invention relates to a combined cooling heating and power circulatory system with carbon dioxide as a carrier. The system comprises a dry ice library, a dry ice machine, a conveying pipe gallery, a branch pipe gallery, a carbon dioxide low-temperature user, a waste heat absorber and a heat energy utilization user. The conveying pipe gallery is provided with a cold carbon dioxide header pipe, a hot carbon dioxide header pipe, an upper conveying belt and a lower conveying belt, wherein the hot carbon dioxide header pipe and the cold carbon dioxide header pipe are located on the lower portion of the lower conveying belt. The branch pipe gallery is provided with an upper conveying belt and a lower conveying belt. The dry ice library is connected to the cold carbon dioxide header pipe through a pipeline, the cold carbon dioxide header pipe is connected to the carbon dioxide low-temperature user through an outlet pipe, and an outlet of the waste heat absorber is connected to the hot carbon dioxide header pipe. The hot carbon dioxide header pipe is connected with the heat energy utilization user, and an outlet of the heat energy utilization user is connected to the dry ice library through the dry ice machine. According to the high and low temperature performance of carbon dioxide, carbon dioxide resources are effectively utilized, greenhouse gas emission is reduced, waste is turned into wealth, atmospheric environment protection is facilitated, and the life quality of people and socialization level are improved.

The invention relates to a carbon dioxide liquid evaporation self-driven refrigerating system. The refrigerating system is formed by sequentially connecting a carbon dioxide low-temperature storage tank, a needle valve, an evaporator, a fan, a capillary pipe, a heat exchanger, a one-way valve and a cutoff valve through a pipeline, wherein the carbon dioxide low-temperature storage tank is provided with a safety valve, a release valve and a ball valve; the output end of the carbon dioxide low-temperature storage tank is communicated with the input end of the ball valve; and the output end of the ball valve is connected with the input end of the needle valve. According to the technical scheme, carbon dioxide liquid is mainly pressed into the evaporator for evaporative refrigeration by using the internal pressure of the carbon dioxide low-temperature storage tank, and a refrigerant is directly discharged into the atmospheric air after absorbing heat. Refrigeration lasting for a corresponding period of time is performed according to the storage volume of the carbon dioxide low-temperature storage tank, so that refrigeration without any external driving power is realized, that is to say, normal work of the refrigerating system can be ensured when power is dissipated.

A low temperature and high pressure liquefaction recovery device for carbon dioxide in petrochemical exhaust gas comprises a raw material gas tank, a compressor, a cooler, a heat exchanger, a distillation column and a lower temperature air turbo expander; an outlet of the raw material gas tank is connected to an inlet of the compressor; an outlet of the compressor is connected with an inlet of thecooler; the outlet of the cooler is connected with the distillation column through the heat exchanger; the lower temperature air turbo expander is connected to an inlet of the heat exchanger.

The invention provides a carbon dioxide low-pressure manifold picking tool and an application and fracture method thereof. The carbon dioxide low-pressure manifold picking tool comprises a picking seat, a support is arranged on the picking seat, a main pipe is fixedly arranged on the support, two axial sides of the main pipe are provided with a plurality of suction inlets and outlets, control valves and mating end caps are arranged at the suction inlets and the outlets, and two axial ends of the main pipe are sealed by a union and a plug. In carbon dioxide fracture construction organization, modular installation of a low-pressure block can be realized, hosting is facilitated, on-site construction pipeline connection modes can be simplified, messy low-pressure pipeline connection is improved, manpower waste is decreased, speed and efficiency are increased, and construction cycle is shortened. Besides, the picking tool is provided with a safety valve and an emptying ball valve, and noisegenerated by airflow is reduced by a thin-walled circular pipe in emptying. Total corrosion resistance, low-temperature resistance and pressure-bearing levels of the picking tool are higher than those of a conventional distributor, and safe, efficient and large-displacement liquid supply requirements are met.

The invention relates to an improved efficient recuperative coal-based supercritical CO2 secondary reheating power generation system. The system comprises a carbon dioxide high-pressure turbine, a carbon dioxide middle-pressure turbine, a carbon dioxide low-pressure turbine, a high-temperature recuperative heater, a low-temperature recuperative heater, a re-compressor, a main compressor, a condenser, a coal-fired boiler air preheater, an air preheater smoke bypass high-temperature heat exchanger, an air preheater smoke bypass low-temperature heat exchanger, a boiler primary reheater, a boilersecondary reheater and a smoke heat exchanger cold side bypass. According to the system, a secondary reheat carbon dioxide power generation system is arranged, the circulation heat efficiency can be improved by 0.3%; a recuperative heating system for heating the carbon dioxide through the smoke is arranged, on one hand, the smoke discharge loss is reduced, the efficiency of a boiler is improved by0.5%, and on the other hand, irreversible heat exchange loss of heat transfer of the recuperative heater is reduced, and the heat efficiency of the circulating power generation can be improved by about 0.15%. By means of the system, the circulation efficiency of an existing coal-based supercritical carbon dioxide power generation system can be integrally improved by about 1% or above.

The invention discloses a gas carbon dioxide liquidation system and method. The system comprises a raw material gas compressor, a circulation compressor, a plurality of parallel adsorbers, a resurgent gas heater, a low-temperature heat exchanger, a rectification purification tower, a plurality of switching valves and a plurality of throttle valves. The method includes the steps that (1) carbon dioxide raw material gas is compressed and cooled; (2) gas carbon dioxide deep purification is carried out; (3) gas carbon dioxide low temperature liquidation is carried out; (4) non-condensable gas in liquid carbon dioxide is removed; and (5) low pressure carbon dioxide gas circulated compression is carried out. The gas carbon dioxide liquidation system is compact in structure, high in efficiency, small in equipment investment and running cost and high in reliability; and by means of the method, safety of the system is improved, a low temperature rectifying tower and the low-temperature heat exchanger are used for replacing expensive refrigeration plants, gas carbon dioxide liquidation is facilitated, the cost of gas carbon dioxide liquidation is greatly reduced, and carbon dioxide gas circulated use is achieved.

The invention relates to a low-energy-consumption desorption system and a low-energy-consumption desorption method for carbon dioxide through cooperation of a catalyst and an external field. Rich liquor absorbing CO2 is conveyed through a rich liquor conveying pump, and the rich liquor and barren liquor conveyed through a barren liquor conveying pump after desorption are subjected to heat exchange in a barren liquor and rich liquor heat exchanger to be heated; the heated rich solution enters a desorption tower, the regenerated barren solution is vaporized by a microwave reboiler and then provides desorption energy for the rich solution in the desorption tower, the barren solution vaporized by the microwave reboiler is in reverse contact with the rich solution, and the contact area sequentially comprises a filler area with an ultrasonic strengthening area and a catalytic area with the ultrasonic strengthening area from top to bottom; the desorbed gas mixture is cooled by a gas-liquid cooler, and liquid obtained after gas-liquid separation by a gas-liquid separator is continuously injected into the desorption tower for circulation; and the energy consumption is reduced by more than 40%. The low-energy-consumption desorption of the carbon dioxide is realized under the action of the catalyst cooperating with the external fields such as the ultrasonic field / microwave electromagnetic field.

The invention relates to the field of tires and particularly relates to a process and device for preparing a graphene tire by coproduction. By coproducing electric oil aluminum alloy ferrosilicon by a coal-based graphene tire, graphene tire production and tail gas pollution emission management, IGCC power generation and oil production are integrated together to realize industrialized application. The process and the device, provided by the invention, have the beneficial effects that firstly, graphene automobile tires, motorcycle tires, tractor tires, bicycle tires, industrial tires and airplane safety tires can be produced at a low cost;; particularly, the anti-puncturing and anti-explosion properties of the tires can be improved, the resistance is increased and the service life is prolonged; secondly, an aluminum alloy can be prepared by using produced carbon black and coal ash and hydrogen is prepared from tail gas produced by the ferrosilicon at a low cost; carbon dioxide collected from the IGCC power generation is used for preparing oil at a low cost; and thirdly, the problems of coal power carbon dioxide emission and fly ash environment pollution are controlled from the source, and the carbon dioxide and the fly ash are 100% utilized.

The invention discloses a one-stage throttling complete cooling carbon dioxide two-stage refrigeration / heat pump integrated experiment table which consists of water systems and a coolant system, and comprises a carbon dioxide low-pressure compressor, a carbon dioxide oil separator I, a carbon dioxide intercooler, a carbon dioxide high-pressure compressor, a carbon dioxide oil separator II, a coolant stop valve group, carbon dioxide tubular heat exchangers (I and II), carbon dioxide finned tube heat exchangers (I and II), electric heaters (I and II), single air conditioners (I and II), water pumps (I and II), a first heat preservation water tank, a second heat preservation water tank, a carbon dioxide gas-liquid separator, a flowmeter group, a dry filter and the like; the switch states of corresponding coolant stop valves are operated to realize simulation of a one-stage throttling middle complete cooling two-stage transcritical carbon dioxide air-cooled refrigeration system, an air source heat pump, a water-cooled refrigeration system, an air source condensation heat recovering system, an air-cooled cold water unit system, a water source heat pump, a water-cooled cold water unit system and a water source condensation heat recovering system.

The invention discloses a two-stage throttling incomplete cooling carbon dioxide refrigeration / heat pump comprehensive experimental table. The comprehensive experimental table comprises water systems and a refrigerant system, and particularly comprises a carbon dioxide low-pressure compressor, a carbon dioxide oil separator I, carbon dioxide gas-liquid separators I and II, a carbon dioxide high-pressure compressor, a carbon dioxide oil separator II, a refrigerant stop valve group, carbon dioxide shell-and-tube heat exchangers I and II, carbon dioxide finned tube exchangers I and II, electric heaters I and II, simplex air conditioners I and II, water pumps I and II, a first heat preservation water tank, a second heat preservation water tank, a flowmeter group, a dry filter, and the like. An air cooling refrigerating system, an air source heat pump, a water cooling refrigerating system, an air source condensation heat recovery system, an air cooling water chiller unit system, a water source heat pump, a water cooling water chiller unit system and a water source condensation heat recovery system which adopt a two-stage transcritical carbon dioxide form of two-stage throttling incomplete inter-cooling can be simulated through adjusting the on-off states of the corresponding refrigerant stop valves.

The invention discloses a device and a method for removing carbon dioxide in tail gas containing ammonia gas, carbon dioxide, polyhydric alcohol and cyclic carbonate generated in the process of preparing cyclic carbonate through reaction of urea and polyhydric alcohol. Carbon dioxide in the tail gas is converted into a carbonate aqueous solution, so that the problem that equipment and pipelines are blocked due to the fact that ammonia in the tail gas reacts with carbon dioxide at a low temperature to generate ammonium salt in the process of preparing cyclic carbonate from urea and polyol is solved. The method has the advantages of high feasibility, no ammonia consumption in the carbon dioxide removal process, simplicity, great convenience, high efficiency, easiness in control, thorough carbon dioxide removal, smooth tail gas post-treatment system and the like.

The invention discloses a two-stage throttling complete cooling carbon dioxide refrigeration / heat pump comprehensive experimental bench. The experimental bench is constituted by a water system and a refrigerant system and comprises a carbon dioxide low pressure compressor, a first carbon dioxide oil separator, a first carbon dioxide gas-liquid separator, a second carbon dioxide gas-liquid separator, a carbon dioxide high pressure compressor, a second carbon dioxide oil separator, a refrigerant stop valve group, a first carbon dioxide shell-and-tube heat exchanger, a second carbon dioxide shell-and-tube heat exchanger, a first carbon dioxide finned tube heat exchanger, a second carbon dioxide finned tube heat exchanger, a first electric heater, a second electric heater, a first single type air conditioner, a second single type air conditioner, a first water pump, a second water pump, a first thermal insulation water tank, a second thermal insulation water tank, a flowmeter group, a drying and filtering device and the like. According to the comprehensive experimental bench, by operating on-off states of corresponding refrigerant stop valves, a two-stage trans-critical carbon dioxide air-cooling refrigeration system, an air source heat pump, a water-cooling refrigeration system, an air source condensation heat recovery system, an air-cooling water chilling unit system, a water source heat pump, a water-cooling water chilling unit system and a water source condensation heat recovery system of two stage throttling and completely cooled in the middle can be simulated.

The invention discloses a preparation method of CaSrNaA for adsorbing carbon dioxide under low pressure. A 4A molecular sieve is mainly used as a raw material, and the ion exchange degree of a Cax / 2Sry / 2NazA molecular sieve meets the following requirements through ion exchange of pure calcium ions, pure strontium ions or calcium and strontium ions: (1) during pure calcium ion exchange (y=0), the calcium ion exchange degree x is 0.7-0.9, and x+z=1; (2) during pure strontium ion exchange (x=0), the strontium ion exchange degree y is 0.4-0.8, and y+z=1; and (3) during calcium-strontium ion exchange (x>0, y>=0.4), 0.7<=x+y<=0.8, and x+y+z=1. The carbon dioxide adsorption capacity of the optimal molecular sieve can reach 10.0-13.4 wt% under the conditions of the temperature of 25 DEG C and the carbon dioxide low pressure (2-6 torr).