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264results about How to "Lower specific resistance" patented technology

Method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in evaporation manner and device of method

The invention discloses a method for cooperatively promoting agglomeration growth of PM (particulate matter) 2.5 and treating desulfuration wastewater in an evaporation manner and a device of the method. The method particularly includes steps that agglomeration liquor prepared by desulfuration wastewater, high polymer adhesive and wetting agent is sprayed into an inlet flue of an electric precipitator and is evaporated by the aid of heat of flue gas, in an evaporation process, the wetting agent promotes dust to enter drops of the agglomeration liquor, the high polymer adhesive is connected with PM2.5 via a polymer chain with polar groups, the grain diameter of the PM2.5 is prompted to be enlarged, so that the PM2.5 can be gathered by the follow-up electric precipitator, the desulfuration wastewater is evaporated completely, suspended matters and dissolvable pollutants in the wastewater are converted into solid to be dissolved out, and the suspended matters and the dissolvable pollutants in the wastewater, together with dust in the flue gas, are gathered by the electric precipitator. The device consists of a boiler, an air preheater, the electric precipitator, a desulfurizing tower, a hydraulic cyclone, a desulfuration wastewater clarification tank and an agglomeration liquor preparation tank, and a double-fluid atomizing nozzle is arranged in the flue between the air preheater and the electric precipitator.
Owner:SOUTHEAST UNIV

Synergistic removal system and method for realizing ultra-low emission of multiple pollutants of smoke of thermal power plant

The invention discloses a synergistic removal system and method for realizing ultra-low emission of multiple pollutants of smoke of a thermal power plant. By the aid of a synergistic dust-removal system consisting of a smoke cooler, an efficient dust remover, an efficient wet desulphurization system and a wet type electric dust remover, the total particulate matter emission in a chimney can be controlled within 5 mg/m<3>. By the aid of a synergistic mercury-removal system consisting of a selective catalytic reduction denitration system, the efficient dust remover, the efficient wet desulphurization system and the wet type electric dust remover, the emission concentration of mercury in the smoke at the chimney can be lower than 6 mu g/m<3>. By the aid of an efficient denitration system consisting of a low-nitrogen burner, a selective non-catalytic reduction denitration system and the selective catalytic reduction denitration system, the NOx concentration can be controlled within 50 mg/m<3>. A two-stage circulation two-tower limestone-gypsum wet desulphurization system is used, a rotary gas-to-gas heat exchanger is cancelled, the leakage of the original smoke to clean smoke is avoided, and the concentration of SO2 in the smoke can be controlled within 35 mg/m<3>. Besides, the synergistic removal system and method are low in overall investment level, and waste heat in the smoke can be recycled to reduce the energy consumption.
Owner:XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD +1

Potassium permanganate lysis/ferric chloride flocculation/biological carbon skeleton combined conditioning method for municipal sludge

The invention discloses a potassium permanganate lysis / ferric chloride flocculation / biological carbon skeleton combined conditioning method for municipal sludge, belonging to the technical field of environmental management. The method comprises the step of feeding certain amounts of potassium permanganate, ferric chloride and biological carbon into excess sludge at a certain stirring speed according to a certain feeding sequence, so as to condition the municipal sludge, so that the dehydration property of the municipal sludge is improved. The method has the beneficial effects that the cost of conditioning agents is low, and the operation is simple; meanwhile, the sludge breakage, flocculating constituent reconstruction and filter cake skeleton structure construction are achieved by virtue of three conditioning agents, so that the dehydration property of the sludge is overall improved, and the limitations of a single method and the combination of two methods in the past are broken through; by virtue of combined conditioning of the three conditioning agents, the dehydration property of the sludge can be obviously improved, and the moisture content of dehydrated sludge reaches 62%-67%; the cost is low, and the process is simple. The method is significant for the solving of the pollution problem of sludge.
Owner:HUNAN UNIV

Boiler energy saving and emission reduction system based on flue gas waste heat recovery and reheating technology

The invention discloses a boiler energy saving and emission reduction system based on flue gas waste heat recovery and the reheating technology. The system comprises an air preheater, a flue gas cooler, an electrostatic dust collector, a desulfurizing tower, a flue gas reheater, and a chimney. A flue gas inlet of the air preheater is communicated with a flue gas outlet of a boiler. A flue gas outlet of the air preheater is communicated with a flue gas inlet of the flue gas cooler. A flue gas outlet of the flue gas cooler is communicated with a flue gas inlet of the electrostatic dust collector. A flue gas outlet of the electrostatic dust collector is communicated with a tail flue gas inlet of the desulfurizing tower. A desulfurized flue gas outlet of the desulfurizing tower is communicated with a flue gas inlet of the flue gas reheater. A reheated flue gas outlet of the flue gas reheater is communicated with a flue gas inlet of the chimney. A hot water outlet of the flue gas cooler is communicated with a hot water inlet of the flue gas reheater. A cold water outlet of the flue gas reheater is communicated with a cold water inlet of the flue gas cooler through a booster pump. The boiler energy saving and emission reduction system based on flue gas waste heat recovery and the reheating technology allows boiler flue gas to be treated and is long in service life, energy efficient and environment friendly.
Owner:XIAN TPRI BOILER ENVIRONMENTAL PROTECTION ENG CO LTD +1

Zero-release coupling humidifying dust-removing synergizing system and method for desulfurization wastewater

The invention relates to a zero-release coupling humidifying dust-removing synergizing system and a zero-release coupling humidifying dust-removing synergizing method for desulfurization wastewater. The zero-release coupling humidifying dust-removing synergizing system comprises a desulfurizing tower, a gypsum dewatering system, a wastewater cyclone, a wastewater box, a rotary spraying and evaporating tower and a dust remover, wherein wastewater treated through the gypsum dewatering system is treated through the wastewater cyclone; afterwards, one part underflows to the desulfurizing tower to be repeatedly utilized; one part overflows to a wastewater box to be collected; the wastewater is conveyed to a rotary sprayer to be atomized; an atomized fog drop descends, is regressively in contact with a high-temperature fume which is introduced from the front of an air pre-heater; a solid particle in the evaporated wastewater and the fume integrally descend to the lower part of a rotary evaporating tower, and enter a front flue of the dust remover through an outlet flue of the rotary evaporating tower; the wastewater passes through the dust remover in a form of purified water vapor to enter the desulfurizing tower. The zero-release coupling humidifying dust-removing synergizing system and the zero-release coupling humidifying dust-removing synergizing method are high in wastewater treatment stability, and are not influenced by the load of a unit; the investment and running expenses are low; the water consumption and the energy consumption are reduced; the fume humidity is increased while the zero release of the wastewater is realized; the dust removal efficiency of the dust remover is improved.
Owner:ZHEJIANG UNIV

Method and device for cooperatively enhancing PM2.5 (Particulate Matter 2.5) removal and smoke afterheat deep utilization

The invention relates to a method and a device for cooperatively enhancing PM2.5 (Particulate Matter 2.5) removal and smoke afterheat deep utilization. The device is composed of a smoke humidifying device, an electric dust remover, a low-temperature coal economizer and a wet desulphurization tower. The method comprises the following steps: before smoke enters the electric dust remover, spraying atomized hot water to carry out humidifying and tempering treatment; enhancing the PM2.5 capturing of the electric dust remover and improving the moisture content of the smoke; providing the atomized hot water by the low-temperature coal economizer; arranging the low-temperature coal economizer between the electric dust remover and the desulphurization tower to recycle the sensible heat released by cooling the smoke to obtain the smoke with high relative humidity; then adjusting an inlet gas-liquid temperature difference and a desulphurization liquid-gas ratio of the subsequent wet desulphurization tower to enable the smoke with the high relative humidity in the desulphurization tower to be over-saturated in a desulphurization and washing process; and carrying out nucleation condensation on over-saturated water steam on the surface of PM2.5 so as to enable the granularity of the PM2.5 to grow and be captured. According to the method and the device, the capturing effect on the PM2.5 by the electric dust remover and a wet smoke desulphurization system can be enhanced and the smoke afterheat can also be recycled.
Owner:SOUTHEAST UNIV

Method for extracting copper from scrap copper through wet process

The invention relates to a method for extracting copper from scrap copper through a wet process. The method comprises the steps of: A) ammonia dissolving leaching: putting scrap copper in a multicomponent solution of ammonia, an ammonia salt, a monovalent chloride, and a divalent copper chloride to form an appropriate electric potential, and reacting the scrap copper with ammonia complex ions so as to be dissolved in the multicomponent solution and generate stable monovalent copper complex ions, filtering out most of metal element impurities Fe, Ni, Al, Sn and Pb from the scrap copper, leaving a small amount of impurities to undergo an oxidation reaction and react with ammonia molecules to generate complex ions of different coordination numbers and exist in the solution; B) extraction for impurity removing: extracting impurities Ag, Fe, Ni, Zn, Bi, Cr, Mn, Sb, Pb, and Sn into an organic phase, and keeping the monovalent copper complex ions in the solution; C) diaphragm electrolytic deposition for preparing high-purity cathode copper: carrying out electrolytic deposition of copper in the cathode chamber of a negative ion membrane electrolyzer, thus obtaining a well crystallized negative copper plate. The method of the invention is characterized by environmental protection and low energy consumption, and can generate high-purity copper directly.
Owner:周毅舟

Dedusting, desulfuration and waste-heat utilization integrated system with low PM2.5 emission

ActiveCN103968401APrevention of "Gypsum Rain" PhenomenonEmission controlFeed-water heatersAir preheaterAtmospheric air
The invention discloses a dedusting, desulfuration and waste-heat utilization integrated system with low PM2.5 emission. The system is composed of a boiler rear smoke channel, an air pre-heater, smoke-water heat exchangers, dust extraction devices, a desulphurization device, a low pressure heat regenerative system and a chimney. The outlet of the air pre-heater of the system is connected with the first-level smoke-water heat exchanger, after smoke is cooled through the heat exchanger, large solid particles carried in the smoke are removed through the first-level dust extraction device, then the smoke enters the second-level smoke-water heat exchanger through an induced draft fan and a booster fan to heat a part of power plant condensed water, and finally the smoke enters the desulphurization device. The outlet of the desulphurization device of the system is connected with the third-level smoke-water heat exchanger, after the smoke is heated up, the smoke enters the second-level dust extraction device to remove plaster particles, and finally the smoke is discharged to the atmosphere through the chimney. The dedusting, desulfuration and waste-heat utilization integrated system with the low PM2.5 emission can prevent the phenomenon of plaster rain of coal-fired power plants from occurring, can effectively reduce the emission load of PM2.5 of coal-fired power plants, and has the advantages of being simple in structure, mature in equipment technology and good in dedusting effect.
Owner:NORTH CHINA ELECTRIC POWER UNIV (BAODING)

Automatic control SCR flue gas denitrification urea pyrolysis system

The invention discloses an automatic control SCR flue gas denitrification urea pyrolysis system. The system is characterized in that a gas-gas heat exchanger is arranged in an inlet flue of an electric precipitator so as to form an air heating unit; a set of flue gas heating tube bundles are arranged in a boiler, so as to form an air reheating unit; after heated by the gas-gas heat exchanger and reheated by the flue gas heating tube bundles, air becomes high-temperature air at the temperature of heat resource required by urea pyrolysis; the high-temperature air is fed into a urea pyrolysis furnace and is mixed with a sprayed atomized urea solution, and then the pyrolysis is performed and an ammonia/air mixture is generated; the ammonia/air mixture is sprayed into an inlet flue of an SCR denitrification reactor through an AIG ammonia injection grating. The automatic control SCR flue gas denitrification urea pyrolysis system has the advantages that the technical structure is simple; the system can be widely applied to an SCR denitrification device of a coal-fired power plant; the urea atomizing pyrolysis efficiency can be effectively increased and the crystal plugging problem can be thoroughly solved; the waste-heat utilization of flue gas can be realized and the electrostatic precipitation efficiency can be increased; water used by a desulfurization system can be reduced.
Owner:ANHUI XINLT POWER TECH CONSULTING +1

System and method for modulating flue gas with sulfur trioxide

The invention discloses a system and a method for modulating flue gas with sulfur trioxide. The system comprises: a storage tank, a sulfuric acid conveying apparatus, a sulfuric acid pyrolysizing furnace, an air compressor for providing compressed air for the sulfuric acid pyrolysizing furnace, a blower and an air heating apparatus for providing hot air for the sulfuric acid pyrolysizing furnace,and an injector. The injector is connected to the sulfuric acid pyrolysizing furnace, and is arranged in the inlet flue of an electrostatic precipitator (ESP). With the flue gas modulating system andmethod provided by the present invention, sulfuric acid solution can be decomposed into a gas mixture of sulfur trioxide and steam under a high temperature; the gas mixture is then injected to the flue gas with the injector arranged in the inlet flue of the ESP; sulfur trioxide and moisture in the flue gas can be combined to form sulfuric acid aerosol attached to the surfaces of the dust particles; specific resistance of the dust can be reduced, and dedusting efficiency of the ESP can be improved. Compared to traditional technologies for modulating flue gas with sulfur trioxide, the method and the system provided by the present invention has advantages of simple operation, good economic benefit, and high improvement efficiency of the ESP.
Owner:FUJIAN LONGKING

Waste water disposal technique by union of steam recompression evaporation and flue spraying technology

The invention discloses a waste water disposal technique by union of steam recompression evaporation and flue spraying technology. The technique includes steps of removing suspended solid and calciumfrom waste water; then delivering waste water to a raw water tank by a water delivering pump after filtering, delivering waste water to a preheater by a raw water pump and a raw water filter to heat;after preliminarily preheating the waste water, heating in a pipe box at the lower part of the heater without evaporation, and then entering a gas fluid separator to carry out flashing and generate enough steam, absorbing steam to a steam compressor; using the secondary steam compressed and heated by the steam compressor as a new heat source and delivering to a shell side of the heater to releasethe potential heat; closing a steam door and realizing the self-circulation evaporation and heat transfer; drawing waste water without being evaporated in the gas fluid separator at a conical side ofthe lower part; delivering the circulated pump to the heater to circularly absorb heat; after circular evaporation for many times, discharging concentrated waste water from one path of the bottom partof the gas fluid separator to a concentrated water box and then delivering to a flue to spray and evaporate; discharging the other path to the raw water tank to adjust water balance. The waste waterdisposal technique is applicable to the treatment of waste water of a heat-engine plant.
Owner:XIAN XIELI POWER TECH

Method for preparing solar cell electrodes, solar cell substrates prepared thereby, and solar cells

The present invention provides a method for preparing electrodes for solar cells, substrates for the solar cells prepared using the same, and the solar cells. The invention forms conductive paste on substrates by a printing method and a wet metal plating method, and forms a non-porous cell structure by directly plating a crystallized metal layer on the substrate via etching without using excessive non-crystallized conductive paste or plating the porous conductive paste with metal. The invention also improves adhesion between the substrates and electrodes and reduces resistivity of the electrodes. In particular the invention improves the efficiency of the solar cells by forming an additional ohmic contact among the plated metal, crystallized metal layer and substrate via heat treatment. The method of the present invention: saves on the amount of expensive conductive paste used by allowing minimum printing to form only on the crystallized metal layer, solves pattern aligning problems, which decrease production and yield, by use of precise patterns through one-time offset printing, and enables high or low temperature sintering in a very short time in comparison to relatively thick electrode patterns, and reduces decreases in efficiency caused by light shielding of the electrodes.
Owner:SSCP CO LTD

Method for improving sludge dewatering performance by combining bioleaching and dual conditioners

The invention relates to a method for improving sludge dewatering performance by combining bioleaching and dual conditioners, and belongs to the technical field of sludge treatment. The method comprises the following steps of: under the condition of adding sufficient substrates, culturing and domesticating autochthonous bacteria in sludge, and using the autochthonous bacteria as inoculum; adding the inoculums into the residual sludge, and performing bioleaching on the sludge under the conditions of aerob, stirring and proper substrate until the pH of the sludge is about 2; adding saturated NaOH solution into the leached sludge to adjust the pH of the sludge to between 6 and 7; adding aluminium polychlorid and polyacrylamide into the sludge to condition the sludge; and performing mechanical dewatering on the treated sludge by a plate-and-frame filter pressing or centrifugal dewatering method to obtain the dewatered sludge with the moisture content between 65 and 75 percent. The bio-acidification and the dual conditioners are combined to improve the sludge dewatering performance, so the reaction efficiency can be improved, the reaction time can be shortened, the treatment capacity can be improved, and the sludge treatment cost can be reduced.
Owner:BEIJING FORESTRY UNIVERSITY
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