63results about How to "Increase discharge temperature" patented technology

The invention relates to a smoke washing device. A washing tower of the smoke washing device comprises a cooling adsorption washing area and an adverse current adsorption washing area. When smoke passes through the cooling adsorption washing area, partial pollutant such as smoke dust in the smoke can be removed, volume flow rate of the smoke is reduced simultaneously, and sectional area of the adverse current adsorption washing area is favorably reduced. In the adverse current adsorption washing area, the smoke dust in the smoke can be absorbed through sufficient contact between the smoke dust and a liquid film, and simultaneously pollutant such as sulfur dioxide can be sufficiently reacted. By means of the smoke washing device, high-efficient smoke dedusting desulfuration is achieved. In addition, washed smoke and heated air are mixed and then discharged out, smoke humidity is reduced, and rime fog at an air outlet of the smoke washing device is avoided. The smoke washing device is small in size, light in weight and applicable to flue gas treatment of a host machine and a boiler of an offshore platform or a traveling ship, and meets miniaturization requirements of on-land fume treatment equipment.

The invention discloses a drying production method and a device thereof for a polyaluminium chloride water purifying agent. The drying production method comprises the steps of: adopting a fluidized bed roaster as a hot blast stove to supply heat, and dividing high temperature flue gas at the temperature of 800-1000 DEG C into first-part flue gas and second-part flue gas, wherein the first-part flue gas and the second-part flue gas can be suitable for drying polyaluminium chloride liquid prepared by taking aluminum hydroxide, bauxite, calcium aluminate, hydrochloric acid and the like as raw materials through utilizing a one-step method or a two-step method, the content of liquid aluminum oxide can be 9-19%, and the basicity of products can be adapted to 40-98%; after liquid materials are dried, the quality of the drum-dried products meet a national standard GB / T22627-2008, and the quality of the spray-dried products meet the national standard GB15892-2009; and after the liquid is subjected to energy-saving drying, compared with the conventional drying process, 50-90 kg of the coals are saved during the production of each ton of solid products. The drying production method and the drying production device are more suitable for production devices in which the annual output of the single set of the drying device is 20000-50000 tons.

The invention discloses an integrated low-carbon micro-discharge energy-saving and emission-reduction boiler system. The system comprises a boiler body (1), a steam drum (2), a heat exchanger (3), a preheater (4), an economizer (5), a superheater (6), a steam turbine (7), a generator (8), a secondary smoke combustion device (9), a desulfuration and dust collect unit (10), an air blower (11) and a smoke exhauster (13), wherein the steam drum (2) and the heat exchanger (3) constitute a hot-water heating circulation loop, the economizer (5) is connected with the steam drum (2), and the air blower (11) feeds air to the preheater (4); the steam drum (2) is connected with the superheater (6), and then connected with the steam turbine (7) by a superheated steam pipe (22); the steam turbine (7) is connected with a low-pressure steam pipe (23), and the generator (8) is linked with the steam turbine (7); and the outlet of a gas duct of the boiler body (1) is connected with a smoke pipe (25), and the smoke exhauster (13) is arranged on the smoke pipe (25), and sequentially feeds smoke into the secondary smoke combustion device (9) and the desulfuration and dust collect unit (10) so as to process and discharge the smoke.

The invention discloses a discharged flue gas self-heating technology of wet flue gas desulfurization. Original flue gas is divided into the thionizer entering flue gas and the bypass flue gas. After the thionizer entering flue gas is washed by spraying a doctor solution in a thionizer, purified flue gas is formed and enters a straight discharging chimney. The bypass flue gas is conveyed into the straight discharging chimney. In the straight discharging chimney, the purified flue gas and the bypass flue gas are fully mixed and then discharged into the atmosphere. Mixed flue gas meets the requirement for environment-protection discharging, meanwhile, the bypass flue gas exchanges heat with the purified flue gas, so that the temperature of the mixed flue gas is raised, and the discharging temperature of the mixed flue gas is controlled to reach more than 70 DEG C. The invention further discloses a desulfuration purified flue gas self-heating device. In order to overcome the defects of a GGH, heat flue gas is used for directly heating the purified flue gas, and the heat flue gas and the purified flue gas are mixed and then discharged. The technology is simple, resistance is small, the GGH does not need to be arranged, the maintenance workload of the device is small, and therefore the wet flue gas desulfurization device is more simple and more practical in technology and meets the requirement for long-time efficient operation.

The invention relates to a white smoke eliminating and purification integrated device. The white smoke eliminating and purification integrated device comprises a gas inlet pipeline, the gas inlet pipeline is communicated with a flue gas warming device, the flue gas warming device is communicated with a purification device, and the purification device is communicated with a flue gas discharge pipe.The flue gas warming device comprises a shell, an inner cavity of the shell is provided with multiple heat exchange pipes, one ends of the heat exchange pipes are communicated with the gas inlet pipeline, the other ends of the heat exchange pipes are communicated with the purification device, and a heat exchange space is formed between the inner wall of the shell and the outer walls of the heat exchange pipes and communicated with the flue gas discharge pipe. By means of the flue gas warming device, high-temperature flue gas in the gas inlet pipeline and low-temperature flue gas in the flue gas discharge pipe can conduct heat exchange to increase the discharge temperature of the flue gas and decrease the temperature of the flue gas entering the purification device. By means of the white smoke eliminating and purification integrated device, the defect that existing flue gas cannot be subjected to purification and white smoke eliminating in one system can be overcome, and the efficiencyof purification and dewatering the flue gas is improved.

The invention discloses a method for preparing granular rubber by adopting three screw rods to continuously extrude devulcanized rubber powder, and belongs to the field of waste rubber cyclic regeneration. Devulcanized rubber powder which is preliminarily and thoroughly cooled is added into a three-screw-rod extruder through a metering feeding device, high shearing, stretching and compression effects are applied on the devulcanized rubber powder on the lower temperature condition by means of the strong material conveying capability, the shearing and mixing capability and the high productivity ratio of the three-screw-rod extruder, a cross-linked network in the devulcanized rubber powder is damaged further, the Mooney viscosity of the devulcanized rubber powder is lowered on the premise of not lowering the mechanical property, a granular rubber product is obtained, and a traditional refiner is replaced. Operation is continuously completed by the adoption of the three-screw-rod extruder on the closed, low temperature and high shearing conditions. The devulcanized rubber powder Mooney viscosity lowering effect which is originally achieved by the traditional refiner is achieved, the production process is environmentally friendly and continuous and saves energy, the stability of the mechanical property and the Mooney viscosity of the obtained granular rubber product is better than that of a product obtained by the traditional refiner.

The invention discloses a flue gas desulfurization process for comprehensively utilizing sintering flue gas. In the flue gas desulfurization process, a desulfurizing tower for absorbing sulfur dioxide and a regeneration tower for reclaiming desulphurization rich solution discharged by the desulfurizing tower are arranged; the sintering flue gas discharged by a sintering machine is conveyed to the regeneration tower, the sintering flue gas taken as a heat source indirectly heats the desulphurization rich solution in the regeneration tower to decompose the sulfur dioxide in the desulphurization rich solution, and an absorption liquid obtained after the desulphurization rich solution is regenerated is conveyed to the desulfurizing tower; and the discharged sintering flue gas in the regeneration tower is subjected to washing, dedusting and temperature reduction and then is sent into the desulfurizing tower, the sintering flue gas is subjected to cyclical absorption and desulphurization by the absorption liquid to obtain purified gas, and the purified gas is exhausted into atmosphere. The flue gas desulfurization process fully makes use of abandon resources, has less energy consumption, and low cost and can effectively reduce the occurrence of the phenomenon of flue gas condensation.

The invention discloses a device and method for condensing, drying and heating flue gas, in particular to a device and method for recovering and recycling condensed water in the flue gas and meeting the temperature requirement for diffusing pollutants in the flue gas to the upper air. A heat fluid outlet of a high-temperature heat tube heat exchanger of the device is connected with a heat fluid inlet of a low-temperature heat tube heat exchanger; a heat fluid outlet of the low-temperature heat tube heat exchanger is connected with a cold fluid inlet of the high-temperature heat tube heat exchanger. The method comprises the following steps of: introducing wet flue gas into an evaporation section of the high-temperature heat tube heat exchanger; heating a high-temperature heat tube; feedingthe wet flue gas subjected to temperature drop into an evaporation section of the low-temperature heat tube heat exchanger; feeding a coolant medium into the evaporation section of the low-temperature heat tube heat exchanger; reducing the temperature of the wet flue gas to below a dew point of water vapor under the action of the low-temperature heat tube; condensing the water vapor in the wet flue gas into water and discharging the water from a flue gas condensed water outlet; discharging the coolant medium absorbing the heat from a cold fluid outlet of the low-temperature heat tube heat exchanger; and heating the condensed dried flue gas by a high-temperature heat tube and discharging the heated flue gas by a chimney.

The invention relates to a flue gas waste heat recovery unit which comprises a flue gas unit, a generator unit, a condenser unit, an absorber unit, a water return pipe and a water supply pipe. The flue gas unit is sequentially connected with the generator unit, the condenser unit and the absorber unit to form a flue gas heat exchanging path; the outlet of the generator unit is connected with the inlet of a solution-to-solution heat exchanger, the outlet of the absorber unit is divided into two paths: one path is merged with the outlet of the solution-to-solution heat exchanger to be connected with the inlet of a solution-to-water heat exchanger through a solution spray pump, the outlet of the solution-to-water heat exchanger is connected with a solution spray mechanism in the absorber unit, the other path is connected with the inlet of a solution-to-solution heat exchanger through a solution circulating pump, and the outlet of the solution-to-solution heat exchanger is connected with a dilute solution spray mechanism through the generator unit so as to form a solution heat exchanging and circulating loop; the outlet of the condenser unit is connected with the inlet of a water-to-water heat exchanger through a condense water spray pump, the outlet of the water-to-water heat exchanger is connected with a condense water spray mechanism through the condenser unit to form a condense water heat exchanging and circulating loop; the water return pipe is connected with a water-to-water heat exchanger unit and the inlet of a solution-to-water heat exchanger, and the water supply pipe is connected with the water-to-water heat exchanger and the inlet of the solution-to-water heat exchanger.

The invention relates to a constant humidity type classification heat exchange dewatering and water sensible heat multistage utilization relaxation heat setting machine. A return air inlet and an exhaust outlet are formed in the lower portion of a drying chamber, the exhaust outlet is communicated to the outside of a box body through an exhaust tube, the return air inlet and an air compensation port in the box body are both communicated with a suction outlet of a fan, an air outlet of the fan is aligned to heat exchangers above the fan, the air outlet above the heat exchangers enters into the drying chamber, an inlet of a high pressure heat exchanger is connected with a steam supply main tube, an outlet of the high pressure heat exchanger is connected with an inlet of a middle pressure heat exchanger through a high pressure drain valve, an outlet of the middle pressure heat exchanger is connected into an inlet of a lower pressure heat exchanger through a middle pressure drain valve, an outlet of the low pressure heat exchanger is connected into a condensate pump through a low pressure drain valve, an outlet of the condensate pump is connected into a new wind preheater, a preheating air outlet of the new wind preheater is connected into the air compensation port of the relaxation setting machine, and low pressure condensate water of the relaxation setting machine is connected into the new wind preheater to achieve indirect heat exchange with new wind. The setting machine can achieve sufficient utilization of waste heat of the exhaust and the condensate water, and is high in heat efficiency.

The invention relates to a box-type waste heat recovering device of sintered ores. The box-type waste heat recovering device comprises a vertical-type box body, a tapered hoper, heat exchanging flowing plates and an air supply unit. A feeding port is formed in the top of the vertical-type box body, the tapper hopper is arranged at the bottom of the vertical-type box body, and a discharging port is formed in the bottom of the tapered hopper. The air supply unit is arranged in the tapered hopper, a circulating air inlet is formed in the bottom of the air supply unit, and an annular air outlet is formed in the top of the air supply unit. A circulating air outlet is formed in one side of the upper portion of the vertical-type box body, and the multiple layers of heat exchanging flowing plates arranged in a staggered mode are arranged on the vertical-type box body in the height direction to form a sintered ore flowing channel which is shaped like the Chinese character 'zhi'. The box-type waste heat recovering device of the sintered ores has the advantages of being continuous and stable in operating, good in airtightness, high in heat exchanging efficiency, small in system resistance and high in waste heat recovering quality.

The invention discloses a solar high-efficient spraying and cooling system, which comprises a solar heat collector and a vapor generator. A heat exchanger is arranged in the cavity, filled with a coolant, of the vapor generator, the heat exchanger and the solar heat collector form a closed circuit, and after the coolant absorbs energy of circulated hot water of the solar heat collector, high-temperature and high-pressure coolant vapor is formed. The system further comprises a secondary spraying device, an evaporation device and a gas condenser, wherein the secondary spraying device is respectively communicated with the evaporation device and the gas condenser, the high-temperature and high-pressure coolant vapor and low-temperature and low-pressure coolant vapor coming from the evaporation device pass through the secondary spraying device to enter the gas condenser, the low-temperature and low-pressure coolant vapor is formed in the evaporation device, and the temperature of the coolant in the evaporation device is enabled to be lowered to a designed temperature. By utilizing solar energy, the system has the characteristics of reliable working performance, low cost, stable operation and high efficiency.

The invention discloses a three-stage countercurrent evaporation salt separating system for high-salt wastewater and a salt separating method thereof. The system comprises a storage tank, a preheater,a condensed water tank, a first heater, a first evaporation chamber, a second heater, a second evaporation chamber, a third heater, a third evaporation chamber, a steam condenser, a vacuum pump, a first concentrator, a first centrifugal machine, a first mother liquor tank, a flash chamber, a second concentrator, a second centrifugal machine and a second mother liquor tank, by adopting a process of combining three-stage countercurrent evaporation sodium salt separating and flash evaporation cooling potassium salt separating with opposite flow directions of steam and materials, the discharge temperature is high, the problem that the low discharge temperature is not beneficial to sodium-potassium separating is solved, and the problem of coprecipitation of potassium chloride and sodium chloride is solved by controlling the concentration of discharged potassium chloride.

The invention relates to a graded drain and condensed water sensible heat cascade use relaxation heat setting machine. In a fresh air preheater, fresh air flows through a low-pressure condensed water preheating section, an intermediate-pressure condensed water preheating section and a high-pressure condensed water preheating section in sequence, and then the fresh air enters an air-supplement port of the relaxation heat setting machine; a main drain pipe of a heat exchanger is connected with a high-pressure drain pipe, an intermediate-pressure drain pipe and a low-pressure drain pipe in parallel, and the high-pressure drain pipe, the intermediate-pressure drain pipe and the low-pressure drain pipe can be switched; an outlet of a high-pressure drain valve is connected to the high-pressure condensed water preheating section through a first condensed water recycling pipe; an outlet of an intermediate-pressure drain valve is connected to the intermediate-pressure condensed water preheating section through a second condensed water recycling pipe; an outlet of a low-pressure drain valve is connected to the low-pressure condensed water preheating section through a third condensed water recycling pipe; drain water of the high-pressure condensed water preheating section is also connected into an inlet of the intermediate-pressure condensed water preheating section; and drain water of the intermediate-pressure condensed water preheating section is also connected into an inlet of the low-pressure condensed water preheating section. The setting machine has the advantage of high heat efficiency, and residual heat of condensed water can be fully utilized.

The invention relates to a continuous water bath sterilization pot. Horizontal sliding gate type feeding and discharging sealing devices adopt the principle of back pressure sealing of gate type U-shaped seal rings and adopt the mode of parallel feeding and discharging. The continuous water bath sterilization pot is suitable for sterilization processing of articles, such as flexibly packaged drinks, flexibly packaged medicaments, ham sausages, flexibly packaged food, pop-top cans, plastic packages and plastic cans, and is mainly formed by combining a material conveying chain, the horizontal sliding gate type feeding sealing device, a sterilization cabin, double layers of load conveying devices, a high-temperature water supply and recovery system, a cooling water supply and recovery system, the discharging sealing device, and the like. The continuous water bath sterilization pot has the advantages that the used sterile water is repeatedly heated by a boiler and then is reused after being filtered and the used cooling water can undergo circulating cooling in a cooling water tower and then can be used, so that the heat energy and plenty of water resources can be saved and the floor area can be reduced; the horizontal sliding gate type feeding and discharging sealing devices can enter 1-3 frames once; the continuous water bath sterilization pot can achieve the effect of increasing the degree of automation and has high application performance and reliability.

The present invention relates to fume desulfurizing technology, and is especially a wet fume purifier for dedusting and desulfurizing fume in coal (oil) burning boiler in large power generating plant. The present invention features the heat exchanger for heat exchange with the high temperature fume to be treated, and aims at providing wet fume purifier capable of raising the temperature of treated fume. Compared with available technology, the present invention has the advantages of high dedusting and desulfurizing efficiency, obvious energy saving effect, compact structure, convenient operation, etc. and can eliminate the corrosion problem of downstream apparatus.

The invention provides a system for deeply eliminating white smoke of a wet desulfurization flue gas, and belongs to the technical field of the flue gas desulfurization application. The system comprises a flue gas heat exchanging system, a desulfurization system and a heat pump circulating system. The flue gas heat exchanging system comprises a first heat exchanger and a second heat exchanger. Thedesulfurization system comprises a desulfurization tower. The desulfurization tower comprises a cooling absorbing section, an outlet section and a washing demisting section which are communicated. The heat pump circulating system comprises a generator, a condenser, an evaporator and an absorber. The system does not need an additional high-temperature heat source, and is capable of cooling desulfurization tower circulating liquid by using a heat pump technology, reducing moisture content of the purified flue gas, and through using circulating slurry heat and high-temperature inlet flue gas heat, improving a discharging temperature of the purified flue gas, greatly improving an unsaturation degree of the purified flue gas, thereby achieving a purpose of deeply eliminating the white smoke, and further reducing content of fine particulate matters in the flue gas through using condensation of water vapor.

The invention discloses a treatment method for low-temperature methanol washing exhaust gas. The treatment method comprises the following steps: washing the low-temperature methanol washing exhaust gas with water by using a water washing tower, and carrying out heat exchange on the washed low-temperature methanol washing exhaust gas used as a cold source and condensate water and / or a low-grade heat source. The low-temperature methanol wash exhaust gas is utilized as the low-temperature cold source to exchange heat with the condensate water or the low-grade heat source, so the discharge temperature of the low-temperature methanol wash exhaust gas is increased, and recovery of the low-grade heat source and condensate water in enterprises and saving of the use amount of desalinated water arerealized in order to achieve the purposes of energy saving and environmental protection.

The invention discloses a dust remover rear flue gas system provided with a flue gas heat exchanger. The system comprises two columns of induced draft fans communicated with a dust remover outlet, the flue gas heat exchanger communicated with the two columns of induced draft fans, a desulfurization absorption tower communicated with the flue gas heat exchanger, and a chimney communicated with the flue gas heat exchanger. The two columns of induced draft fans, the flue gas heat exchanger, the desulfurization absorption tower and the chimney are all arranged on the same straight line. The desulfurization absorption tower and the chimney are vertically arranged side by side. The two columns of induced draft fans and the flue gas heat exchanger are arranged between the chimney and the desulfurization absorption tower. The flue gas heat exchanger is arranged above the two columns of induced draft fans and comprises a gas inlet heat exchanger part communicated with one end of the desulfurization absorption tower, and a gas outlet heat exchanger part communicated with the other end of the desulfurization absorption tower. The gas inlet heat exchanger part and the gas outlet heat exchanger part are arranged into a whole. The dust remover rear flue gas system provided with the flue gas heat exchanger effectively utilizes space, the occupied land is saved, flue resistance and flue material consumption are reduced, and operating economy of a power plant is improved.

The invention discloses a process method for removing sulfur dioxide from boiler flue gas, coke oven flue gas, oil refining FCC regeneration flue gas and the like in hydrocarbon oxidative combustion, and a system for implementing the method. Therefore, the desulfurization process method disclosed by the invention has the advantages that the desulfurization efficiency and the emission suspended matter index can reach the special emission limit standard of atmospheric pollution of the Ministry of Environmental Protection; and in addition, the method also has the characteristics of low water content of the discharged flue gas and high flue gas emission temperature, and effective support is provided for reducing the generation of atmospheric haze and high-altitude heat emission of the flue gas. The typical implementation scheme is as follows: a carrier ball loaded with calcium hydroxide particles is in full contact with flue gas flowing transversely, radially and vertically through a moving bed reactor and is subjected to desulfurization reaction. The carrier ball can vertically move from top to bottom and also can obliquely move and flow according to a certain angle, so that a concentration difference is formed between a desulfurizing agent and sulfur dioxide in flue gas, and the desulfurizing effect is ensured to meet the environment-friendly emission requirement.

The invention belongs to the technical field of waste gas treatment, and discloses a method for cleaning and purifying sulfur-containing tail gases. The method includes the following steps: subjectingthe acidic sulfur-containing tail gases to a second-stage Claus reaction, feeding the reacted Claus tail gases to the bottom of a spraying tower, enabling the gases to run upwardly, discharging the gases from the top of the spraying tower after the gases contact with clear water downwardly sprayed from a spray nozzle at the top of the spraying tower, injecting the gases into a primary adsorptiontower provided with CuO activated carbon adsorbents to conduct adsorption treatment, cooling the gases by a heat exchanger, injecting the gases into a secondary adsorption tower provided with boron-nitrogen double-doped iron oxide activated carbon composite adsorbents to conduct adsorption treatment, and discharging out the treated gases. The method for cleaning and purifying the sulfur-containingtail gases has the advantages that efficient and stable desulfurization can be realized, the operational stability of the process is high, the treated gases can be directly discharged into the atmosphere, the diffusion speed is high, and formation of haze can be effectively prevented.

To provide a thermal exhaust air treatment plant, comprising a combustion chamber and a heat exchanger for transferring heat from a cleaned gas produced in the combustion chamber to an untreated gas to be supplied to the combustion chamber, wherein the heat exchanger comprises an inner heat exchanger chamber through which an inner fluid medium can flow and comprises an outer heat exchanger chamber through which an outer fluid medium can flow, which thermal exhaust air treatment plant permits regulation of the cleaned gas outlet temperature without a reduction in the cleaned gas quality, it is proposed that the thermal exhaust air treatment plant comprises a bypass device with a separating device by means of which a part of the outer fluid flow can be separated, as a bypass fluid flow, from an outer residual fluid flow, and with an admixing device by means of which the bypass fluid flow can be admixed to the residual fluid flow again after the residual fluid flow has passed through a section of the outer heat exchanger chamber.

The invention discloses an annealing cooling device for hot-rolled steel balls. The annealing cooling device for hot-rolled steel balls comprises a first chute, a horizontal transportation shaft, a heat exchange iron tube, a second chute and a water cooling tank. A spiral reinforcing steel bar is connected to the outer shaft wall of the horizontal transportation shaft in a sleeving mode, and the heat exchange iron tube and the horizontal transportation shaft are arranged in parallel; the top end of the first chute is connected to an annealing furnace, a notch in the bottom end of the first chute is located right above one end of the heat exchange iron tube, the other end of the heat exchange iron tube is located right above the top end of the second chute, and the heat exchange iron tube is provided with a circulating water inlet pipe and a circulating water outlet pipe; the bottom end of the second chute is connected to the side wall of the water cooling tank, a rotary shaft with feeding spiral blades is arranged on the water cooling tank, and the water cooling tank is also provided with a cold water inlet pipe, a water outlet pipe and a steel ball outlet. By cooing the annealed steel balls by way of sectional cooling, the steel ball cooling time is relatively short, the annealing effect is good and the work efficiency is high. The annealing cooling device has a function of identifying the internal stress of the steel balls, so that the product quality of the steel balls is guaranteed.

The invention relates to a constant humidity type classification heat exchange dewatering and water-wind sensible heat multistage utilization relaxation heat setting machine. A return air inlet and an exhaust outlet are formed in the lower portion of a drying chamber, the exhaust outlet is communicated to the outside of a box body through an exhaust tube, the return air inlet and an air compensation port in the box body are both communicated with a suction outlet of a fan, an air outlet of the fan is aligned to heat exchangers above the fan, the air outlet above the heat exchangers enters into the drying chamber, an inlet of a high pressure heat exchanger is connected with a steam supply main tube, an outlet of the high pressure heat exchanger is connected into an inlet of a middle pressure heat exchanger through a high pressure drain valve, an outlet of the middle pressure heat exchanger is connected into an inlet of a lower pressure heat exchanger through a middle pressure drain valve, an outlet of the low pressure heat exchanger is connected into a condensate pump through a low pressure drain valve, an outlet of the condensate pump is connected into a new wind preheater, a preheating air outlet of the new wind preheater is connected into the air compensation port of the relaxation setting machine, and exhaust and low pressure condensate water of the relaxation setting machine are respectively connected into the new wind preheater to achieve indirect heat exchange with new wind. The setting machine can achieve sufficient utilization of waste heat of the exhaust and the condensate water, and is high in heat efficiency.

The invention belongs to the technical field of high-purity magnesia high-temperature shaft kiln production, and specifically relates to a method for energy-saving, environment-friendly and efficient operation of a high-purity magnesia high-temperature shaft kiln for calcining high-purity magnesia. And the three aspects of raising the discharge flue gas temperature; wherein the method of maintaining the negative pressure in the kiln is to use the kiln cover plate of the welded structure; the method of forming the high-speed air flow at the kiln mouth feeding position is to use the air flow to form a sleeve; the lifting discharge The structure of flue gas temperature includes return air fan, return air pipeline and hot air circulation inlet pipeline. Compared with the prior art, the beneficial effects of the present invention are: 1) The absolute value of the negative pressure inside the kiln is increased by 500pa, which can reduce the energy consumption of the smoke exhaust fan by 40% compared with the past. 2) The bonding in the high temperature area is not obvious, and the operating life of the kiln (cleaning cycle) is more than doubled. 3) Raise the temperature of flue gas discharged from the kiln by more than 50°C, realizing the energy-saving, environment-friendly, efficient and safe operation of the high-temperature shaft kiln.