117results about How to "Reduce removal costs" patented technology

The invention relates to a flue gas desulfurization and denitration purification recovery system, which comprises an oxidation absorption tower, a separation regeneration system and a concentration crystallization drying device, wherein the oxidation absorption tower comprises an oxidation tank, a flue gas inlet, a spraying filler layer, an atomization oxidation layer, a demister and a flue gas outlet. According to the present invention, flue gas enters the oxidation absorption tower from the flue gas inlet to carry out oxidation absorption on nitrogen oxides, sulfur oxides and heavy metals in the flue gas so as to form the absorption liquid, the purified flue gas is subjected to moisture removing through the demister and then is discharged from the flue gas outlet, anions of the absorption liquid are exchanged into the bed layer in the anion exchange equipment of the separation regeneration system, ammonia water is adopted to perform regeneration on the bed layer, the regenerated ammonium salt solution enters the concentration crystallization drying device, and crystallization drying is performed to form the composite ammonium fertilizer; and the nitrogen oxides, the sulfur oxides and the heavy metals in the flue gas can be removed in the integrated manner, such that the problems of ammonia escape and ammonium salt aerosol in the prior art can be avoided, and characteristics of simple equipment and product resource are provided.

Disclosed is a desulfurization and denitrification process utilizing microwave to intermittently irradiate activated carbon. Two or more adsorption beds filled with activated carbon particles are used for adsorbing or implementing microwave irradiation to flue gas of boilers alternatively. Flue gas is delivered into one of the adsorption beds by an induced draft fan, then the adsorption bed begins to run, and sulfur and nitric oxides in the flue gas are adsorbed by the activated carbon. After the activated carbon in the adsorption bed in running is saturated, the adsorption bed is in a regenerating state so as to be reused. The flue gas is delivered into the other adsorption bed beginning to run so as to be adsorbed, activated carbon particles of the regenerating adsorption bed are irradiated by microwave, sulfur and nitric oxides adsorbed on the surface of the activated carbon are quickly reduced and decomposed into elemental sulfur and nitrogen gas under high temperature, and the different adsorption beds are switched between the running state and the regenerating stage alternatively. Metal oxide is used as a reduction reaction catalyst so as to reduce reduction and decomposition temperature and loss of carbon. By the desulfurization and denitrification process, energy consumption of microwave irradiation can be reduced greatly, loss of carbon can be decreased, and in-situ regeneration of activated carbon is realized. In addition, the desulfurization and denitrification process has the advantages of fine desulfurization and denitrification effect, short time for regeneration of activated carbon, low cost for desulfurization and denitrification, high recovery rate, easiness in industrialized implementing and the like.

The invention discloses a process for removing nitrite in aquaculture wastewater by immobilized nitrobacteria. The process comprises the preparation of nitrobacteria concentrated solution, the preparation of nitrobacteria immobilized particles, the activation of the nitrobacteria immobilized particles, the preparation of a nitrobacteria immobilized particle reaction packet and the removal of nitrite in the aquaculture wastewater by the reaction packet, wherein the preparation of the nitrobacteria immobilized particles comprises the steps that an aqueous mixture of polyvinyl alcohol, sodium alginate and silicon dioxide is heated and fully dissolved, and is evenly mixed so as to be made into embedding solution; when the embedding solution is cooled down to room temperature, embedding nitrobacteria concentrated solution is added in the embedding solution; after evenly mixed, the mixed solution is dripped into a crosslinking agent; the crosslinking agent consists of calcium chloride solution and saturated boric acid solution which are mixed according to the volume ratio of between 1 to 1 and 1 to 3; and finally, the immobilized particles are filtered out by a piece of gauze. The process has the advantages that nitrite has quick, continuous and stable degradation effect, and maintains high biological activity for a long time; moreover, the reaction packet can be used repeatedly and has the advantages of simple manufacturing method and low cost, thereby having enormous application prospect.

The invention discloses a data operation optimization method based on power plant desulfurization system, and the method comprises the steps: obtaining the actual operation data of a power plant actual operation system in a certain time period, and carrying out the preprocessing and regression analysis of the actual operation data; dividing different working conditions according to the operation load, and performing numerical simulation to obtain overall flow field, temperature and SO2 component distribution conditions of the desulfurization system under different working conditions; carrying out big data analysis on the actual operation data of the desulfurization system of the coal-fired power plant to obtain an optimal interval of the operation data under the determined working condition; and practicing the big data optimization result in the simulation result to check the accuracy of the optimization result. According to the method, the working conditions are firstly distinguished before the neural network prediction model is established, so that the data size is reduced, the relationship among the energy consumption, the sulfur removal rate output parameters and the influence factors is relatively clear and simple, and the precision can be ensured.

The invention provides an antibiotic and heavy metal removed meso-porous silicon based bifunctional adsorbing material and a preparation method thereof. The adsorbing material contains a functional group-amino and Fe (III). The method comprises the following steps: uniformly mixing a mesoporous molecular sieve with a methylbenzene solution in protective atmosphere after drying the mesoporous molecular sieve, adding a silane coupling agent into the mixed solution, mixing and stirring in the protective atmosphere, filtering, cleaning, drying, adding into an Fe (III)-containing alcoholic solution, stirring, filtering, cleaning and drying to obtain the meso-porous silicon based bifunctional adsorbing material. The prepared adsorbing material contains different functional groups, can specifically adsorb specific pollutants, can remove the antibiotics and heavy metals in a water body under the complexing action of the amino and the heavy metal and the complexing action of the Fe (III) and the antibiotics, and the removal cost can be reduced; and besides, the preparation method is simple and the conditions can be controlled easily.

The elimination of iron scale on surface of stainless steel plate is completed with several shot blasting machines. The present invention features that SM150-type steel grits are filled into the material bin of the shot blasting machines and used in eliminating iron scale on surface of stainless steel plate. The present invention has sanding coefficient of 1.1-1.2, throwing head rotation speed of shot blasting machines of 1850-2000 rpm, annealing temperature of the hot rolled stainless steel plate of 1125-1140 deg.c, the brush roller pressure current in the pickling zone after elimination of 20-30 A, the washing water pressure not lower than 5Br and the technological speed of the hot rolled stainless steel plate of 60-67 m / min. Three shot blasting machines have separated thrown portions for high eliminating effect, and the present invention has low scale eliminating medium consumption, low cost and low surface roughness of the eliminated stainless steel plate.

The purpose of the present invention is to obtain an ethylene•α-olefin•non-conjugated polyene copolymer that has a low permanent compression set at low temperatures, is flexible, and has an excellent balance of rubber elasticity at low temperatures and tensile strength at normal temperatures. This ethylene-based polymer is an ethylene•α-olefin•non-conjugated polyene copolymer that includes units derived from ethylene (A), units derived from an α-olefin (B) containing 4-20 carbon atoms, and units derived from a non-conjugated polyene (C) and satisfies (1)-(4). (1) The molar ratio of (A) to (B) is 40 / 60-90 / 10, (2) the contained amount of the units derived from (C) is 0.1-6.0 mol %, (3) ML(1+4)125° C. is 5-100, and (4) the B value is 1.20 or more.

The invention discloses a highly toxic waste water pre-treatment device and a use method thereof. The device comprises an active sludge adsorption unit and a coagulation absorption unit. In a use process, the active sludge adsorption unit removes COD (chemical oxygen demand) and partial heavy metal; the coagulation absorption unit removes most of the heavy metal. According to the practical use conditions, the installation and use sequence of the active sludge adsorption unit and the coagulation absorption unit can be freely arranged. The highly toxic waste water pre-treatment device disclosed by the invention has the advantages that heavy metal ions and the organic matter concentration of aromatic organic matters, phenol organic matters, ether organic matters and the like in industrial waste water can be greatly reduced; the total COD removal rate reaches 60 to 80 percent; the heavy metal removal rate reaches 80 percent; the beneficial conditions are provided for subsequent deep treatment of industrial waste water.

The invention discloses an in-situ precipitation preparation method for a geopolymer fluorine removal agent. An alkali-activated geopolymer serves as a carrier, and metal ions are loaded onto geopolymer particles by adopting an in-situ precipitation method. The whole preparation process is simple in process and mild in conditions, no other additive is needed, a high-temperature calcining link is not needed, the preparative energy consumption is reduced, and the removal efficiency and production cost are taken into account. The experimental results show that the geopolymer fluorine removal agent prepared by in-situ precipitation has the characteristics of being uniform in coating, uniform in particle size, large in specific surface area, high in porosity, stable in mechanical property and the like, and direct packing is conveniently performed for conducting separating experiments; and the product has an excellent effect of adsorbing fluorine ions in water, the adsorbent failed after adsorption completion can be treated by utilizing a geopolymer curing mechanism, secondary pollution is avoided, and the product serving as a novel fluorine ion adsorbing material has wide prospects in the aspect of water treatment.

The invention discloses an ultralow-emission power generation system using low-calorific-value fuel for combustion. The ultralow-emission power generation system comprises a high temperature circulating fluidized bed boiler, a low temperature dust remover, a wet-process smoke desulphurization system and a wet type electric dust remover, wherein the high temperature circulating fluidized bed boiler comprises a controllable multi-stage air supply system, an ash staging cooling and discharging system, a low resistance air distribution device, a highly efficient cyclone separator, a deep denitration system and a strong smoke cooler and is small in N2O emission amount, and porous ashes are used for adsorbing SO3 and heavy metals; the ash concentration in the boiler and material grain size distribution can be adjusted through the ash staging cooling and discharging system when the low-calorific-value fuel for combustion is combusted so as to optimize combustion, heat transmission and flowing; the ultralow emission of NOx is realized through the controllable multi-stage air supply system and the deep denitration system; the ultralow emission of SO2 is realized by combining the wet-process smoke desulphurization system and calcium-injection desulfurization in the boiler; the ultralow emission of dust is realized through the lower temperature dust remover, the wet-process smoke desulphurization system and the wet type electric dust remover. According to the ultralow-emission generation system, the emission standards of thermal power plants and natural gas turbine generator units in key areas, the cost of pollutant removal is low and the environmental benefit is remarkable.

The invention discloses a control method of inclusions in ultra-low carbon steel and aims at solving the technical problem of high removal cost and difficulty in effective removal of aluminum oxide inclusions in the ultra-low carbon steel with the carbon content being 0.0020 percent grade at present. The control method of the inclusions in the ultra-low carbon steel comprises the following steps of 1) adopting converter top-bottom blowing; 2) conveying molten steel in a steel ladle into a refining furnace for refining treatment; 3) conveying the molten steel in the steel ladle into an RH vacuum furnace for refining treatment; and 4) performing slab continuous casting on the molten steel after refining treatment with the RH vacuum furnace to obtain a continuous cast slab. The control methodis simple in technology control, effectively removes the inclusions in the steel in the ultra-low carbon steel production process, is low in removal cost of the inclusions and is stable and reliable.

The invention discloses a method for removing the sulfate ions in brine water or industrial briny water. Sedimentation agent which takes up 0.5-8 permillages of the total weight of the brine water or the industrial briny water is added in the brine water or the industrial briny water the SO4<2-> concentration of which is more than 10 grams per liter. The sedimentation agent is stirred up until dissolving. Then, the lime sludge for making soda produced during ammonia soda production process is added and stirred up evenly, the adding amount of which is 20-30 percent of the total volume of the brine water or the industrial briny water. The SO4<2-> in the brine water or the industrial briny water can be removed after being filtrated. The method treats a waste with another waste, greatly reduced the removal cost of the sulfate ions to less than 5 RMB per ton of brine water, has simple technological flow, is convenient to be operated, can protect environment, does not bring secondary pollution to the brine water or the industrial briny water and surrounding environment, ensures that the content of the sulfate ions is reduced by more than sixty percents, and can meet the requirement that the sulfate ions content in the brine water or the industrial briny water is less than 5 grams per liter after being treated.

The invention discloses a method for expelling fouling organisms on a small ship to by using a washing device. A vertical rotary washing device is suspended at the edge of the upper side of a ship side by using a lifting rope and is adsorbed to the external side of a hull at a first height by means of a magnetic attraction force; the rotary washing device is started to begin to clear the fouling organisms on the external side of the hull; the upper end of the lifting rope moves along the edge of the upper side of the ship side at a constant speed; the rotary washing device synchronously and transversely move in a direction consistent with the direction of the upper end of the lifting rope along the external side of the hull under the action of a counter-acting force of the hull so as to finish the clearing of the fouling organisms at the first height; the lifting rope is enabled to form an included angle of 20-30 degrees with the vertical direction; the rotation axis of a washing partof the rotary washing device is inclined; the rotary washing device moves to a second height on the external side of the hull in a downwardly inclined manner; and the clearing of the fouling organismson the external side of the hull can be finished in sequence by repeating the steps. According to the method for expelling the fouling organisms on the small ship to by using the washing device, thefouling organism clearing cost is low, the fouling organism clearing effect is good, and the problems of high requirements on personnel and potential safety hazards can be solved.

The invention provides a rapid removing method for protium in gas-containing a tritium hydrogen isotope. The rapid removing method sequentially comprises the following steps: a. carrying out leakage rate checking on a palladium retention method protium removing device, inflating He to realize the pressure being 1.5MPa and keeping the pressure for 60min; b. carrying out pre-treatment before purification; c. carrying out purification treatment; and d. carrying out post-treatment. By adopting the rapid removing method for the protium in the gas-containing the tritium hydrogen isotope, the low-protium gas-containing the tritium hydrogen isotope can be obtained.

The invention discloses a method for removing smell substances in water by using zero-valent iron to activate persulfate. The method utilizes the zero-valent iron to dissolve out ferrous ions in a reaction system, activates the persulfate to generate free sulfate radicals and degrades the smell substances in the water so as to achieve the purpose of removing the smell substances in the water. The method has the advantages that the smell substances with low concentration can be effectively removed under the condition of less addition amount, simultaneously the weakening of the removing effect due to excessive ferrous ions can be avoided; a better removing effect can be achieved under normal temperature, the pH application range is wide, the operation is simple, the method can be implemented without need of adding other equipment and can be used for removing the smell substances in the water.

The invention relates to a method for removing nitrate and nitrite during cucumber clear juice processing. The method comprises the following steps: crushing to prepare cucumber pulp, squeezing to prepare cucumber normal juice, carrying out enzymolysis and centrifugal treatment on the cucumber normal juice to obtain cucumber clear juice, adding active carbon in the cucumber clear juice to carry out stirring adsorption, carrying out ultrafiltration, heating to 45-50 DEG C, obtaining clarified cucumber clear juice through a resin adsorption column, and carrying out vacuum concentration, sterilization and filling on the cucumber clear juice to obtain the nitrate and nitrite removed cucumber clear juice. According to the method, macroporous resin is used for adsorbing the nitrate and nitrite in the cucumber juice during cucumber clear juice processing, so that the removal cost is low, the efficiency is high and the quality index of the domestic and export fruit and vegetable juice can be fully satisfied; meanwhile, the macroporous resin can be repeatedly used through elution, and the elution rate is up to above 90%.

The invention relates to the field of cleaning equipment, and discloses an adlet eliminating machine with a hollow planet carrier and a water flow route. Four spraying nozzle type brush heads, a pack basket type rack, three transmission hollow shafts, a planet carrier, a gear pair, the hollow planet carrier, a driving hollow shaft, a bearing block, two sealing bearings, a thru hole I, a thru hole II and a sealing water cavity are mainly included; the sealing water cavity is defined by the driving hollow shaft, the bearing block and the two sealing bearings, the bearing block is provided with the thru hole I, and the driving hollow shaft is provided with the thru hole II; the spraying nozzle type brush heads, the transmission hollow shaft, a hollow planet carrier center shaft, the driving hollow shaft and a main shaft motor output shaft are sequentially connected; and water passes through a water storage box, a water pipe, the thru hole I, the sealing water cavity, the thru hole II, the driving hollow shaft, the hollow planet carrier and the spraying nozzle type brush heads in sequence, and the three spraying nozzle type brush heads on the periphery can revolute and rotate. The adlet eliminating machine with a hollow planet carrier and the water flow route are novel in design, the water route system layout is reasonable and ingenious, the using rate of a detergent is improved, and the effect is good.

The invention provides a method for removing dyes in water by utilizing a magnetic metal-organic framework material and relates to the method for removing the dyes in the water, and the method is mainly used for solving the problems of complicated process, low treatment efficiency and high cost of the existing method for removing the dyes in the water. The method comprises the following steps: 1) preparing the metal-organic framework material so as to obtain the metal-organic framework material; 2) preparing the magnetic metal-organic framework material so as to obtain the magnetic metal-organic framework material; 3) removing the dyes in the water, namely firstly, adding the magnetic metal-organic framework material into to-be-treated water, stirring for certain time at a certain stirring speed and carrying out magnetic separation by utilizing a magnet so as to finish the removal of the dyes in the water. The method is mainly used for removing the dyes in the water.

The invention relates to a method for desulfurizing and denitrating boiler gas simultaneously by using active carbon under microwave radiation, which is used for solving the problem of removing sulfur dioxide and nitrogen oxide. The technical scheme is achieved as follows: dedusted gas is introduced into an active carbon bed, is desulfurized and denitrated under the condition that active carbon is heated 400-600 DEG C by microwave, and 10-30kg of CuCl is added into per cubic meter of active carbon to be used as a catalyst. The invention greatly improves the desulfurizing rate and the denitrating rate by using the selective heating property of the microwave and combining the reducing capacity of the carbon to SO2 and NOx, and can achieve desulfurizing rate above 95 percent and denitrating rate above 90 percent. The CuCl catalyst is coated on the surface of the active carbon, therefore, the invention can obviously reduce the denitrating reaction temperature, not only reduces the loss of the active carbon, but also improves the reaction condition, and is beneficial to the recovery of elemental sulfur.

The invention provides a municipal solid waste landfill waste leachate treatment device, and belongs to the field of wastewater treatment. A system is high in internal circulation ratio and strong inimpact load resistance, an external carbon source is omitted, organic matters in waste leachate are preferentially used for nitrogen removal by pre-denitrification, electrocatalytic oxidation nitrogenremoval serves as supplement and gate-keeping, and the total nitrogen removal rate of the system can meet emission standards. Total nitrogen is removed by electrocatalytic oxidation, and total nitrogen removal cost is lower than that of nitrogen removal by adding the carbon source. The system does not generate high-salinity concentrated liquor, and investment and operation of high-cost high-salinity concentrated liquor treatment equipment are omitted. A screening system with a low ion rejection rate is selected, screened high-concentration wastewater and low-concentration wastewater are subjected to electrocatalytic oxidation, the salt content of the system can be controlled, the influence of inorganic salt over-accumulation on biochemical treatment efficiency is avoided, the device is suitable for industrial application, and final discharge outlet water quality is superior to municipal solid waste landfill pollution control standards (GB 16889-2008).

The invention provides preparation and application of a modified nano-hydroxyapatite adsorbing material. The coupling effect of a magnetic stirrer and ultrasound is utilized to ensure that hydroxyapatite can be completely integrated into nanometer titanium dioxide dispersion, by controlling the parameters such as water bath refluxing time, a drying temperature and the reaction pH, the rate of loading of nanometer titanium dioxide by nano-hydroxyapatite is increased, and then the novel adsorbing material capable of simultaneously adsorbing various heavy metal ions and with a high adsorption rate is obtained, so that adsorption and removal of the heavy metal ions in soil are realized.

The invention provides a protection structure of an expansive soil cutting slope and a construction method. The protection structure comprises a bottom protection structure, a middle protection structure and a top protection structure. The bottom protection structure sequentially comprises first waterproof geotechnical cloth, a foundation drainage cushion layer and a first reinforced layer from bottom to top; a seepage ditch is formed in the foundation drainage cushion layer; the middle protection structure sequentially comprises an internal drainage layer, a second reinforced layer and a slope cultivation soil layer from inside to outside; the internal drainage layer is connected with the foundation drainage cushion layer and can drain water to the foundation drainage cushion layer; the second reinforced layer is arranged on the first reinforced layer; the slope cultivation soil layer is located on a road surface; the top protection structure comprises second waterproof geotechnical cloth and a top protection layer; the second waterproof geotechnical cloth is arranged on the top of the middle protection structure; and the top protection layer is arranged on the second waterproof geotechnical cloth. The construction method is a method for constructing the protection structure. According to the protection structure of the expansive soil cutting slope and the construction method, the expansive soil slope can be effectively treated, and the stability of a slope base structure is maintained.

The invention discloses a method for treating ethyl nitrite in sodium azide synthesis tail gas and belongs to the technical field of tail gas treatment. The method comprises the step of leading ethyl nitrite air flow into an absorption liquid containing urea, hydrogen ions and nitrate. The method is low in cost, the reaction is mild, the concentration of ethyl nitrite in the tail gas can be greatly reduced, and the treatment efficiency is 99.1%. The method can effectively protect the environment and have very good economic benefits and social benefits.

The invention discloses a method for regulating the proportion of S / G type lignin and improving the degradation and conversion efficiency of cell walls by using laccase PtoLAC14, and belongs to the technical field of plant genetic engineering. The CDS sequence of the PtoLAC14 is shown as SEQ ID No. 1. It is discovered for the first time that the populus tomentosa PtoLAC14 can specifically regulateand control polymerization of G-type lignin monomers, and the PtoLAC14 is edited by using a CRISPR / Cas9 technology, so that transgenic plants with reduced total lignin content, reduced G-type lignincontent and increased lignin S / G ratio are obtained; the cell wall degradability of the transgenic plants is obviously improved, so that the removal cost of lignin during biological energy source production and papermaking is reduced. The invention lays a foundation for lignin genetic improvement and directed molecular breeding of plants, provides a new gene resource for plant genetic engineering,and has a wide application prospect.

The invention relates to an adsorbing agent simultaneously removing H2S and Hg in middle temperature coal gas and a preparation method of the adsorbing agent as well as the application of the adsorbing agent. The adsorbing agent is metallic oxide loading gamma-Al2O3, wherein metallic oxides are Fe, Zn and / or Pd oxides; according to the total percent by weight of the adsorbing agent, the percent by weight of the Fe oxide, i.e. Fe2O3 is 0-50wt%, the percent by weight of the Zn oxide, i.e. ZnO is 0-40wt%, and the percent by weight of the Pd oxide, i.e. PdO is 0-10wt%, wherein the percent by weight of the Fe, Zn and Pd oxides is asynchronously 0, and the total percent by weight of the content of the Fe, Zn and Pd oxides is less than 100wt%, and the balance is a gamma-Al2O3 carrier. The preparation method has the advantages of simple process and easiness in operation and high removal rate of sulfur and mercury; and the prepared adsorbing agent not only can be used for separately or jointlyremoving H2s and H in the middle temperature coal gas, but also can be used for removing mercury from other gases.

The invention provides a method of removing oxalate from Bayer-process washing liquid. The method comprises the following steps: adding NaOH into washing liquid so as to crystallize and separate out sodium oxalate; then performing solid-liquid separation to obtain sodium oxalate, wherein the concentration of C2O4<2-> in the washing liquid is 5-15g / l, the concentration of Na2OK in the reaction liquid is 200-300g / l, and the added NaOH is solid or solution. The method provided by the invention effectively reduces the loss of alkali and aluminum oxide, lowers the cost of removing sodium oxalate and obtains a relatively pure sodium oxalate product; the use of lime is avoided, the volume of residues is reduced, and the working conditions are improved; moreover, it is unnecessary to particularlycontrol the alkali liquid in a low-concentration range. The method of removing sodium oxalate provided by the invention is applicable to the technology of producing aluminum oxide from various types of bauxite by a Bayer process, and has a wide application range.

The invention discloses a water body floating object environment-friendly remover and a using method thereof, and belongs to the technical field of water body treatment and environmental protection. Removal of floating objects of different sizes can be realized, and meanwhile, automatic adjustment can be carried out according to the cleaning amount of the floating objects; and on one hand, the active adjustment is carried out by rotation in the horizontal direction, and on the other hand, the removal at the height of the water surface is maintained by descending in the vertical direction. Theremoved floating objects are effectively collected and prevented from escaping back to a water body again, and in the clearing process, through the disturbance effect of the water body, the breathingeffect of a lung is simulated to actively capture and adsorb the small floating objects in the water body, and the small-sized floating objects are removed, so that the removing effect on the water floating objects is improved; and in addition, technical personnel can be timely reminded to recycle through specular reflection when removal is saturate, the removing cost is low, repeated utilizationcan be achieved after treatment, all-weather quick removing is carried out in an unpowered mode, the removing effect is remarkable, environmental protection is achieved, and secondary pollution is avoided.

The invention discloses a method for treating waste gas in ethyl nitrite production process, belonging to the technical field of environmental protection. The method comprises the following steps: introducing gas flow containing ethyl nitrite and nitric oxides into absorption liquid containing urea, hydrogen ions and nitrate for reacting. According to the method disclosed by the invention, the cost of treating the produced waste gas mixed with nitric oxides and ethyl nitrite during ethyl nitrite protection is low, the reaction is mild, the concentration of the ethyl nitrite in tail gas can be greatly reduced, the environment can be effectively protected, and the method has excellent economic benefits and social benefits.

The invention relates to a pile foundation dismounting method and an offshore foundation dismounting method. The offshore foundation dismounting method comprises the following steps that lifting ropesare connected to a guiding pipe frame, and the guiding pipe frame is cut; the lifting ropes are lifted, and the guiding pipe frame is removed; the outer sides of pile foundations are sleeved with enclosure sleeves; sea water and sediment between the enclosure sleeves and the pile foundations are removed; connecting bars are arranged between the enclosure sleeves and the pile foundations; the pilefoundations are cut, and thus to-be-removed pile bodies are obtained; and the to-be-removed pile bodies, or the enclosure sleeves or the connecting bar are lifted, and the to-be-removed pile bodies are lifted to the preset positions. During dismounting, the outer sides of the pile foundations are sleeved with the enclosure sleeves, each enclosure sleeve and the corresponding pile foundation are connected into a whole through arrangement of the connecting bars, thus after the pile foundations are cut, the cut to-be-removed pile bodies can be moved to the preset positions by hoisting the enclosure sleeves, or the connecting bars, and the pile foundations are dismounted. Using of a large lifting ship is avoided, the construction period is further shortened, and the removing cost is lowered.