34results about How to "Improve emission reduction efficiency" patented technology

The invention belongs to the technical field of N2O emission reduction in a coal-fired fluidized bed, and particularly relates to a biomass gasified gas re-burning mode and a biomass gasified gas re-burning system for a coal-fired fluidized bed. The wall of a fluidized bed boiler is provided with a plurality of biomass gasified gas nozzles, biomass gasified gas is introduced into a hearth of the fluidized bed boiler, and the biomass gasified gas is reacted with N2O-containing smoke generated by burning of coal dust in the hearth to realize multi-stage re-burning so as to improve the burning efficiency of the whole fluidized bed and reduce the emission of N2O. Compared with pyrolysis and direct burning, the biomass gas rich in combustible substances such as H2, CH4, CO and the like has low ash content and extremely low sulfur content, has no sulfur removal problem, is ideal re-burning fuel and can effectively reduce the emission of nitrogen oxides by using mixed burning of the biomass gasified gas and the coal dust; and because of low alkali metal and chlorine content in the gasified gas, problems of slag formation and corrosion can be avoided, utilization of the coal dust is not affected and efficient clean utilization of the biomass can be realized.

The invention discloses an iron ore sintering flue gas PM10 and PM2.5 emission reduction method, belonging to the technical field of reduction of emission of pollutants in an iron ore sintering process. According to the method, in an iron ore sintering process, an agglomeration solution is sprayed in a sintering flue gas channel, and fine particulate matter in sintering flue gas is agglomerated and grows up under the action of the agglomeration solution, and then is removed by a dedusting device; the agglomeration agent comprises polymeric aluminium chloride, sodium carboxymethylcellulose, polyacrylamide and a solid additive. According to the iron ore sintering flue gas PM10 and PM2.5 emission reduction method, the droplets of the agglomeration solution adsorbing fine particulate matter are nucleated and collided and grow up under low pressure to form large particle agglomerates, the agglomerated and grown fine particulate matter is removed by the dedusting device, and high-efficiency emission reduction of the fine particulate matter is realized. Therefore, the method can provide a brand-new means for reduction of emission of fine particulate matter in an iron ore sintering process.

The invention discloses a method for inhibiting emission of fine particles in the process of iron-ore sintering by an agglomeration process and belongs to the technical field of emission reduction of pollutants in the process of iron-ore sintering. The method comprises the following steps: (1) preparing agglomeration liquid, namely uniformly mixing components such as sodium carboxymethyl cellulose, polyacrylamide and an additive to obtain an agglomeration agent, and mixing the agglomeration agent and water to obtain the agglomeration liquid; (2) agglomerating fine particles, namely spraying the agglomeration liquid into flue gas to cause fine particles in the sintering flue gas to be agglomerated to grow larger under the action of the agglomeration liquid; and (3) trapping by a dust removing device, namely trapping and removing the fine particles agglomerated to grow larger by the dust removing device. The method disclosed by the invention has the advantages that agglomeration liquid droplets adsorbing the fine particles are nucleated and collide with each other and grow to form large-particle agglomerates under the condition of low pressure, and a dust-removing device is adopted to remove the fine particles agglomerated to be larger, so that an all-new emission-reducing path is provided for reducing the emission of fine particles in the process of iron-ore sintering.

The invention discloses a discharge reducing and resourcing method of coal-burning power station flue gas carbon dioxide, which is characterized by the following: adopting amino material as adsorbent; injecting amino material solution as ammonium salt pattern into the flue gas of carbon dioxide adsorbing system after pre-dedusting the tail part of coal-burning stove to reduce 20-95% carbon dioxide in the flue gas; separating and purifying to obtain high-purity carbon oxide; fitting for industrial, chemical, food manufacturing, oil extracting oil displacement and so on; making the escape rate of ammonium in the clean gas discharged by defroster not more than 15mg/Nm3. The invention simplifies the flow path technique with obvious kind and quantity of manufacturing equipment, which has more widely using prospect.

A gas recovery system for improving the efficiency of abatement and/or implementing reclamation and reuse of unused feed materials in effluent of a semiconductor manufacturing facility, especially in instances in which substantial portions of feed material are unused. The effluent is treated to reversibly capture the unused feed material, e.g., at a capture locus such as a physical adsorbent, cold finger, cryotrap, heat exchanger/condenser, membrane separation unit, filter, etc., and the captured unused feed material then is released from the capture locus and processed for such abatement and/or reclamation and reuse.

The invention relates to a low-carbon method for improving the emission reduction efficiency of oxynitride in circulated flue gas from a sintering machine, and the method comprises the following steps: (1) taking the flue gas in the middle of the total flue gas from a main flue, circulating the taken flue gas, wherein the flue gas is specifically taken from the area 20-70% from the head of the sintering machine to the bottom of the sintering machine, and the content of the oxygen in the flue gas in the upper circulating hood of a sintering pallet is no less than 18%; and (2) uniformly allocating an iron ore into sintering auxiliaries to serve as a catalyst. The invention provides a technical method for improving the circular denitration for the flue gas from the sintering machine with lowcost and low energy consumption. The technical method is characterized in that the iron ore is uniformly added into the sintering auxiliaries based on the flue gas circulation of the sintering machine, so as to improve the efficiency for denitration of the oxynitride. The technology provided by the invention is implemented based on the flue gas circulation of the sintering machine, the efficiencyfor denitrating the oxynitride from the circulated flue gas can be increased to 80-90% on the premise of not increasing the investment on equipment and construction, and the cost for energy consumption and operation.

The invention relates to a circulating spouting type NOx emission reduction system and a working method thereof. The circulating spouting type NOx emission reduction system comprises a rotary kiln, asmoke chamber, a spouting ring, a fuel system, a tertiary air pipe, a reactor, a first material distribution valve, a first cyclone cylinder, a denitration system, a decomposing furnace, a hopper anda second cyclone cylinder. An air inlet of the smoke chamber is connected with an air outlet of the rotary kiln, an air outlet of the reactor is connected to one side of the decomposing furnace and communicated with the interior of the decomposing furnace, and an air inlet of the reactor is connected with an air outlet of the smoke chamber through the spouting ring. An air outlet of the tertiary air pipe is connected to the bottom of the decomposing furnace, a feeding port of the hopper is connected to the lower portion of the air outlet of the tertiary air pipe, and an air inlet of the secondcyclone is connected with an air outlet of the decomposing furnace; The formation of NOX is effectively avoided or reduced so that the emission reduction efficiency of NOX is improved, and the ammonia water consumption of the denitration system is greatly reduced to save the production cost; meanwhile, the problem of serious material accumulation at the bottom of the decomposing furnace is solved, and secondary pollution can be avoided.

The invention provides a dry dust removal and wet desulphurization integral efficient smoke gas purification device and relates to the relevant fields of dust removal and desulphurization, smoke gas purification and energy saving and emission reduction industries. The dust removal and desulphurization device produced in China at present has the defects that the structure is simple, the performance is single, or the dust removal function is realized while the desulphurization function is not realized, or the desulphurization function is realized while the dust removal function is not realized, and the dust removal function and the desulphurization function are not perfectly combined. The dry dust removal and wet desulphurization integral efficient smoke gas purification device consists of an advanced cyclone dry dust remover and a Venturi wet desulfurization tower with highest efficiency and is characterized in that the integral efficient smoke gas purification device is formed by combined by an A tube dry dust removal structure and a B tube wet desulphurization structure, a smoke gas outlet of the dry dust remover and a smoke inlet of the wet desulphurization tower are connected into a smoke gas passage, and meanwhile, the dust removal and the desulphurization are respectively completed in each tube body. The dry dust removal and wet desulphurization integral efficient smoke gas purification device is applicable to smoke gas dust removal and desulphurization of various boilers, industrial kilns and high-emission enterprises such as cement plants, chemical plants, steel plants and power plants.

The invention discloses a composite agglomeration agent for reducing emission of fine particles in flue gas from iron-ore sintering and agglomeration and belongs to the technical field of emission reduction of pollutants in the process of iron-ore sintering. The composite agglomeration agent comprises the following components in parts by mass: 0-20 parts of polymeric aluminium chloride, 20-40 parts of sodium carboxymethyl cellulose, 20-40 parts of polyacrylamide and 2-5 parts of an additive. Agglomeration liquid is sprayed into a flue-gas channel of sintering flue gas, fine particles in the sintering flue gas are agglomerated to be larger under the action of the agglomeration liquid, and a dust-removing device is adopted to remove the fine particles agglomerated to be larger. The composite agglomeration agent disclosed by the invention has the advantages that agglomeration liquid droplets adsorbing the fine particles are nucleated and collide with each other and grow to form large-particle agglomerates under the condition of low pressure, and the dust-removing device is adopted to remove the fine particles agglomerated to be larger, so that an all-new emission reducing path is provided for reducing the emission of the fine particles in the process of iron-ore sintering.

The invention discloses a dust removal method of a pulse type high-frequency power supply. The dust removal method comprises the following steps that (1) a high-frequency power supply is installed through process improvement, and an electrostatic dust removal system is connected; (2) a modulation and demodulation technology is adopted, a rectifier transformer is driven, and a high-frequency powersupply is output; (3) the dust removal efficiency and the electricity-saving efficiency of an electrostatic dust remover with the power factors of 95%, 96% and 97% are set; (4) the optimal power factor of the electrostatic dust remover is set by investigating the dust removal efficiency and the electricity-saving efficiency of different power factors; and (5) and the pulse type high-frequency power supply electrostatic dust remover is controlled through the optimal power factor to perform dust removal. According to the method, the technical modification measures are adopted, the process is improved, and the voltage is modulated and demodulated in different degrees, so that the dust removal efficiency of the electric field is improved.

The invention discloses a method for reducing emission of sintering flue gas pollutants by utilizing SCR-containing waste catalyst pellets, and belongs to the technical field of pollutant emission reduction in the sintering process. In the preparation process of a sintering raw material, a sintering pellet is added, and the sintering pellet is sequentially provided with an inner-layer pellet, an outer-layer pellet and a catalyst layer from inside to outside. An ammonia inhibitor is included in the inner-layer pellet, and the ammonia inhibitor can release ammonia gas after being heated and decomposed. A pore-forming agent is included in the outer-layer pellet, and the pore-forming agent enables pores to be formed in the outer-layer pellet in the sintering process. The catalyst layer comprises an SCR catalyst and vanadium-titanium blast furnace slag. The pore-forming agent in the sintering pellet is heated and decomposed to generate pores, and therefore decomposition of the ammonia inhibitor such as urea and release of NH3 are delayed, the ammonia inhibitor is consistent with the NOX emission window period, NOX emission is reduced, and cooperative emission reduction of SO2, NOX and dioxin is realized in a breakthrough manner under the action of the catalyst.

The invention discloses an SO2 and NOx collaborative emission reduction method in a sintering process, and belongs to the technical field of pollutant emission reduction in the sintering process. In the preparation process of a sintering raw material, multilayer composite pellets are added, and each multilayer composite pellet comprises an inner-layer pellet body and a wrapping layer arranged outside the inner-layer pellet body; an ammonia inhibitor and an inner-layer pelletizing material are added in the preparation process of the inner-layer pellet bodies, the ammonia inhibitor can release ammonia gas after being heated and decomposed, and the content of an N element in the ammonia inhibitor accounts for 0.02%-0.15% of the mass of the inner-layer pellet bodies; and then the inner-layer pellet bodies are wrapped with the wrapping layers by using the outer-layer pelletizing material. According to the SO2 and NOx collaborative emission reduction method, the emission reduction efficiencyof SO2, NOx and dioxin can be effectively improved by adding the multi-layer composite pellets in the sintering process.