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159results about How to "Improve mercury removal efficiency" patented technology

Preparation method of rare-earth-based composite multi-component denitrification and dioxin removal catalyst

ActiveCN104226301AImprove catalytic oxidation abilityImprove surface acidity and alkalinityDispersed particle separationMetal/metal-oxides/metal-hydroxide catalystsPolymerDenitrification
The invention discloses a preparation method of a rare-earth-based composite multi-component denitrification and dioxin removal catalyst. According to the preparation method, titanium dioxide (titanium white) and silicon powder as carriers and ammonium metatungstate, ammonium metavanadate, cerous nitrate and lanthanum nitrate as active components, the steps of mixing, kneading, molding, drying and roasting are carried out in the presence of auxiliary materials to prepare the catalyst, wherein the auxiliary materials include monoethanolamine, citric acid, ammonium hydroxide, lactic acid, stearic acid, glass fibers, macromolecular polymer fibers RP-CHOP, hydroxypropyl methyl cellulose, polyoxyethylene and water. The prepared catalyst can simultaneously decompose nitric oxides and dioxin and can improve the mercury removal efficiency of the existing smoke control device. The prepared catalyst is not only applicable to new power plants, but also suitable for the modification of a wet-method desulphurization device of an old power plant, 80 to 95 percent of HgO generated in a coal burning power plant can be oxidized to Hg<2+> by utilizing the prepared catalyst, and a majority of particle-state Hg<2+> can be removed by utilizing a dust removal device.
Owner:山东信义汽车配件制造有限公司

Method and system for collectively removing NOx and mercury (Hg) in coal-fired flue gas by utilizing secondary combustion of biomass charcoal

The invention discloses a method for collectively removing NOx and mercury (Hg) in coal-fired flue gas by utilizing the secondary combustion of biomass charcoal, which is characterized in that: on the basis of the secondary combustion denitrification and the recycling of flue gas, the biomass charcoal is used as secondary-combustion fuel, the characteristics of the biomass charcoal such as low sulfur, low nitrogen, chloride containing, high ash-coke activity, high energy density, zero carbon dioxide (CO2) net emission and the like are utilized, and the biomass charcoal is sent into a secondary-combustion area of a hearth, the combined removal of multiple pollutants such as NOx, Hg and the like in the coal-fired flue gas can be realized through the catalyst reduction effect of anoxic combustion and biomass charcoal as well as the catalyst oxidation effect of chloride contained flue gas and high-activity ash and coke. The invention also discloses a system for realizing the method, which comprises a biomass charcoal preparing system, a coal pulverizing system, a hearth, a combustion system of the hearth, a flue gas recycling system and a boiler tail-gas processing system. The biomass charcoal is used as the secondary-combustion fuel, so the technical advantages of the secondary combustion of the fuel and the recycling of the flue gas can be integrated, and the method and the system have the advantages that: the investment cost and the running cost are low, the denitrification efficiency and the mercury removal efficiency are high, the CO2 net emission can be reduced, and the like.
Owner:NANJING NORMAL UNIVERSITY

Demercuration adsorbent based on pillared montmorillonite, preparation method and application thereof

InactiveCN105664838AImproving the Ability of Adsorption and Removal of Mercury in Coal-fired Flue GasImprove thermal stabilityGas treatmentOther chemical processesMass ratioSorbent
The present invention provides a mercury removal adsorbent based on pillared montmorillonite, its preparation method and application. The adsorbent includes a carrier and an active component loaded on the carrier. The carrier is pillared montmorillonite. The active component is a metal oxide, and the ratio of the mass of the metal element to the mass of the pillared montmorillonite in the metal oxide is ≤10.0wt.%. The adsorbent makes full use of the structural characteristics of montmorillonite and the activity of the active components to adsorb elemental mercury, so that the two can play a synergistic effect; the mercury removal adsorbent not only has high thermal stability: mercury removal within 100-450 °C The efficiency reaches 99%, and it also has a high mercury removal efficiency: the inlet mercury concentration is 120ug / m 3 The mercury removal efficiency is as high as 99% within 10 hours, and over 94% even within 20 hours. It can be used to remove mercury in flue gas produced by power plants, industrial boilers or industrial kilns.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI

Biomass carbon-based flue gas demercuration adsorbent and preparation method thereof

InactiveCN103252212AControl pollution dischargeRealize the double effect of protectionOther chemical processesDispersed particle separationMercury pollutionNitrogen gas
The invention discloses a biomass carbon-based flue gas demercuration adsorbent and a preparation method thereof. Based on comprehensive utilization of biomass resources and control of flue gas mercury pollutants, the emission of flue gas mercury is controlled by using modified biomass tar as the adsorbent. The biomass carbon-based flue gas demercuration adsorbent with a developed pore structure and abundant surface functional groups is prepared through treating processes of pyrogenic decomposition (at 400-800 DEG C in a nitrogen atmosphere) and steam activation (at an activation temperature of 800 DEG C with an N2-to-H2O mole ratio of 1: 1) of biomass raw material, modified reagent (H2O2, ZnCl2, NaCl or NaBr) solution dipping, and the like; and the biomass carbon-based flue gas demercuration adsorbent has the characteristics of wide adsorbent raw material source, simple preparation process, low cost, high demercuration efficiency and the like, and is suitable for coal-fired power plants and management of flue gas mercury emission in the fields of waste incineration and the like. The carbon-based flue gas demercuration adsorbent is prepared by adopting biomass, so that the emission reduction of mercury pollution can be realized, and the renewable resource of biomass can be utilized efficiently in a large scale; and the biomass carbon-based flue gas demercuration adsorbent has obvious economic benefit, environmental benefit and social benefit.
Owner:NANJING NORMAL UNIVERSITY

Novel activated carbon fiber adsorbing substance as well as preparation method and use thereof

The invention discloses a novel activated carbon fiber adsorbent a preparation method and the application thereof. The activated carbon fiber adsorbent is characterized by carrying MoS2 on the surface of activated carbon fiber. The preparation method comprises the following steps: the activated carbon fiber is used as a carrier, ammonium molybdate is used as a precursor, and deionized water is used as a solvent to be prepared into steeping liquor, wherein the mass ratio of the activated carbon fiber to the ammonium molybdate is 1 : 0.25 to 0.3; the ammonium molybdate is carried in the activated carbon fiber by a wet immersion method, and then, the activated carbon fiber immersed with the ammonium molybdate is heated to 450 to 500 DEG C in inert atmosphere to be oxidized and decomposed to obtain MoO3-activated carbon fiber; and then, the MoO3-activated carbon fiber is heated to 800 to 825 DEG C in Ar / H2S to be sulfurized, and finally, the activated carbon fiber with the surface carried with MoS2 is prepared, i.e. the activated carbon fiber adsorbent is prepared. When the activated carbon fiber adsorbent is used for removing mercury in fume, the effect is good, and the activated carbon fiber adsorbent also has the advantages of simple preparation and easy process control.
Owner:ZHEJIANG UNIV OF TECH

Preparation method of praseodymium-doped titanium dioxide composite nanofiber photocatalyst

The invention discloses a preparation method of a praseodymium-doped titanium dioxide composite nanofiber photocatalyst. The preparation method comprises the following steps: (a) adding tetrabutyl titanate into a mixed solution of absolute ethyl alcohol and acetic acid, uniformly mixing, then sequentially adding praseodymium acetylacetone and polyvinylpyrrolidone into the mixed solution, further stirring to obtain precursor solution; (b) adding the precursor solution into an injector of an electrostatic spinning device and controlling the process condition of electrostatic spinning to prepare praseodymium-doped titanium dioxide nanoffiber non-woven fabric; (c) putting the nanofiber non-woven fabric into a muffle furnace, increasing the temperature from the room temperature to 500 DEG C under the air atmosphere to calcine, then naturally cooling to the room temperature to obtain the required composite nanofiber photocatalyst product. According to the preparation method of the praseodymium-doped titanium dioxide composite nanofiber photocatalyst, the mercury removal efficiency and performance of coal-fired flue gas can be remarkably improved; meanwhile, the method has the advantages of being convenient to operate, low in cost and low in energy consumption, so that the method is especially applicable to application places for mercury removal of smoke in a coal-fired power plant.
Owner:HUAZHONG UNIV OF SCI & TECH

Efficient and economic mercury-containing waste water treatment method

the invention relates to an efficient and economic mercury-containing waste water treatment method. The efficient and economic mercury-containing waste water treatment method comprises the following steps of 1, adding an alkaline substance into high-concentration mercury-containing waste water so that the total mercury concentration is reduced to mercury concentration below 0.6mg / L, and 2, when the total mercury concentration of the high-concentration mercury-containing waste water is below 0.6mg / L, adding a sulfur-containing chelating agent into the high-concentration mercury-containing waste water according to 0.005 to 0.2% of the volume of the high-concentration mercury-containing waste water, adjusting a pH value of the mixed solution to a pH value of 3 to 7, adding 0.5 to 10% by mass of a flocculating agent into the clear solution according to a flocculating agent-clear solution volume ratio of 0.001 to 0.01 when mercury in the mixed solution is separated out, and carrying out solid-liquid separation after flocculating to obtain clarified waste water of which total mercury content is below 0.001mg / L. The efficient and economic mercury-containing waste water treatment method has the advantages that mercury removal efficiency is high; a scope of application is wide; a preparation treatment cost and a low equipment investment are low; and mercury-containing precipitates are gathered naturally and solid waste residues are treated centrally so that recovery and recycle are easy.
Owner:SHAANXI JINTAI CHLOR ALKALI CHEM CO LTD

Regeneration method of flue-gas demercuration absorbent

The invention discloses a regeneration method of a flue-gas demercuration absorbent composition. The regeneration method comprises the following steps: (a) washing an inactivated absorbent by using hydrogen peroxide solution, removing impurities such as flying ash on the surface of the absorbent, and converting elemental mercury absorbed on the surface of the absorbent into mercury in an oxidation state; (b) treating reacted mercury absorbent by using supercritical water and washing out the mercury absorbed; (c) further treating aqueous solution obtained in the step (b) by using sulfide solution, so as to obtain mercuric sulfide precipitate, and recovering the mercuric sulfide precipitate; (d) dipping and activating the absorbent in ferric chloride solution with the concentration being 1-3mol / L; and (e) drying, then roasting for 1-3 hours, thus obtaining the regeneration absorbent. The regeneration method disclosed by the invention is applicable to regeneration of the modified-metal-oxide-based mercury absorbent, and the recovery of the absorbing performance of the regenerated absorbent is good, so that the service life of the absorbent is prolonged and the economic and social benefits are good.
Owner:浙江大业新材料股份有限公司

Method for recovering mercury in situ from mercury fume in non-ferrous metal metallurgy

The invention discloses a method for recovering mercury in situ from mercury fume in non-ferrous metal metallurgy. The method comprises the following steps: performing absorption and mercury removal on mercury fume to obtain mercury-containing acid mud, and performing flocculation concentration and dehydration on the mercury-containing acid mud to obtain mercury-containing mud residues; pre-treating the mercury-containing mud, performing incineration, and recovering liquid mercury in a centralized manner by virtue of a multistage mercury condensation and collection device. The method is simple, low in cost, small in occupied area and high in efficiency of collecting and recovering the metal mercury, construction can be performed nearby a mercury fume production area of non-ferrous metal metallurgy, and environmental risk existing in the process of shipping out and treating the mercury-containing acid mud and during transportation can be avoided. Moreover, tail gases containing trace mercury can be introduced into a mercury fume purification system in non-ferrous metal metallurgy to be subjected to mercury removal again, a special tail gas treatment device does not need to be constructed, secondary pollution is effectively prevented from being avoided, and the method is simple and can be used on a large scale.
Owner:湖南西林环保材料有限公司

Preparation method for flue gas mercury-removing active carbon

The invention provides a preparation method for flue gas mercury-removing active carbon. The preparation method comprises the following steps: step 1, removing a surface chemical group of a raw material: washing the particle active raw material with 10.wt%-30.wt% NaOH solution and drying the raw materials at 100-120 DEG C; step 2, immersing halide salt: mixing, immersing and agitating the raw material active carbon with an oxygen-containing group on the surface and a halide salt solution according to the mass ratio ranging from 1:1 to 1:5 for 4-12 hours; filtering and drying to obtain active carbon carrying the halide salt, wherein the concentration of the halide salt solution is 10wt.%-50wt.%; step 3, loading halogen: putting the active carbon carrying the halide salt into a U-shaped pipe to form a filling layer; inputting air with the halogen from the top of the filling layer at the speed of 100-500mL / min and keeping the heat for 1-10 hours at room temperature to obtain saturated halogen-loaded active carbon; and step 4, heating the saturated halogen-loaded active carbon at the temperature in a range of 80-120 DEG C to remove the volatile halogen to prepare the flue gas mercury-removing active carbon.
Owner:INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY

Algae-char-impact-tower-based mercury removal method and preparation method of algae char

The invention relates to an algae-char impact-tower-based mercury removal method. The method comprises the following steps: performing pyrolysis on algae to prepare biomass char as a flue gas mercury removal adsorbent, and adsorbing and removing mercury in one impact tower reactor; recycling mercury resource and regenerating the adsorbent in a separator; cooling mercury-containing flue gas from a burner and spraying the flue gas into the impact tower reactor through a Laval spray pipe, spraying the algae char adsorbent into the impact tower reactor through the Laval spray pipes which are coaxially and oppositely arranged, and enabling two strands of gas flows to have opposite impact in the impact tower reactor so as to realize the adsorption and removal of mercury. When regeneration is performed in one impact tower reactor, flue gas from the burner is automatically switched and flows into the other impact tower reactor. The two impact tower reactors are alternatively used for performing regeneration. According to the method and the device, the biomass char is prepared by utilizing pyrolysis of algae and used for adsorbing and removing mercury, the removal process has no secondary pollution, the raw material of the adsorbent is a regenerative resource with wide reserves, and wide application prospects can be achieved.
Owner:南京朗洁环保科技有限公司

Ag and two-dimensional MXene modified high-temperature flue gas dust removal, denitration and mercury removal catalytic film and preparation method thereof

The invention belongs to the field of air purification, in particular to an Ag and two-dimensional MXene modified high-temperature flue gas dust removal, denitration and mercury removal catalytic filmand a preparation method thereof. The catalytic film is composed of a ceramic support and an active catalytic layer spread in a hole channel of the ceramic support, the active catalytic layer comprises a two-dimensional MXene nanosheet, AgNO3, active metal, a carrier, a dispersing agent and an adhesive; according to the invention, the two-dimensional layered MXene nanosheet is used as a structural guiding agent to prepare the Ag and two-dimensional MXene modified high-temperature flue gas dust removal, denitration and mercury removal catalytic film; the introduction of the two-dimensional MXene nano material enables the catalytic layer to have a two-dimensional and three-dimensional assembly structure, more active sites are provided, the contact between gas and the catalyst is increased,and the denitration and mercury removal efficiency is improved; meanwhile, by utilizing the separation performance of the film, the dust removal, denitration and mercury removal integrated treatment can be achieved at high temperature, and the flue gas purification process is simplified.
Owner:CHINASALT JINTAN
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