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

Disclosed is a sorbent for the removal of mercury from combustion flue gas and a preparation method thereof. The sorbent includes an activated heavy oil heavy ash impregnated with 0.1-30% by weight of any chemical substance selected from sulfur, iodine, bromine and chlorine. The sorbent is prepared in an economical manner using heavy oil fly ash, industrial waste generated from heavy oil-fired boilers, and has excellent sorption performance for mercury, so that a low concentration of mercury contained in combustion flue gas discharged from large-scale boilers can be removed by injection of a small amount of the sorbent. Thus, the invention can prevent a reduction in the recycling rate of coal fly ash in coal-fired power plants and minimize operation cost.

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.

A wet flue gas desulfurization and demercuration process and a system thereof based on two-stage oxidizing reaction. The process does two-stage oxidizing treatment to the simple substance HgO in flue gas utilizing to ultraviolet radiation and oxidant of halogen series, transmutes the gas phase divalent ion Hg2+ therein to liquid phase divalent ion Hg2+ using the modified limestone-gesso wet desulfurization process, and then transmutes the liquid phase divalent ion Hg2+ to the stable mercuric sulfide-HgS deposition via stabilizer of liquid phase divalent ion Hg2+. The system comprises desulfurization and demercuration equipments such as an ultraviolet irradiator, an electrical precipitator, an oxidant spraying unit and a reaction absorber etc, gesso treatment equipments of desulfurization byproduct, and a treating equipment for mercuric sulfide-HgS deposition. The process and the system thereof can raise the oxidation rate of simple substance Hg in the flue gas effectively, and at the same time effectively overcome the reduction release of divalent ion Hg2+ to avoid secondary pollution and be capable of raise desulfurization and demercuration efficiency of limestone-gesso wet desulfurization system.

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.

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.

The invention discloses a flue gas treatment method for simultaneous desulfurization, denitrification and demercuration by a calcium and magnesium method. The method comprises the steps of (1) carrying out dust removal on the flue gas of a boiler, then enabling the flue gas to enter a static mixer, spraying ozone into the static mixer at the same time, and carrying out mixed oxidation on the flue gas of the boiler and the ozone; (2) after mixed oxidation, enabling the mixed gas to enter an absorption tower from the bottom of the absorption tower, spraying the mixed slurry of magnesium oxide and limestone or magnesium oxide and lime in a circulating way in the absorption tower, and feeding a demercuration agent into the absorption tower; (3) finally, discharging the sprayed and absorbed flue gas via a chimney from the top of the absorption tower. After the method is adopted, the denitration performance of the whole technology is maintained to be at a higher level, and high efficiency of desulfurization and demercuration is realized.

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.

The invention discloses a mercury removal method based on active carbon online activation and a mercury removal device based on activated carbon online activation. Low temperature plasma treatment is carried out on active carbon and high-activity gas, so that the high-activity gas is changed into high-activity atomic or ionic state by plasma and is loaded on the active carbon, an active site is formed on the active carbon, and further online activation of the active carbon is realized; and then the online activated active carbon is fed into a flue, so as to adsorb and remove mercury in flue gas in the flue, and further mercury removal treatment of the flue gas is realized. According to the mercury removal method and device, a method for online activating the active carbon by virtue plasma is utilized for obtaining modified active carbon, mercury removal efficiency of the active carbon is improved, and the advantages of short consumed time and convenience in treatment are realized.

The invention discloses a preparation method of an environment-friendly active carbon catalyst. The preparation method comprises the following steps: (1) mixing an active carbon precursor, a simple substance or a compound containing at least one VIA family element, and an inorganic adhesive, performing extrusion forming after kneading, and drying to obtain a formed material; (2) preparing steeping fluid of a compound containing at least one of a IA family element, a IIA family element, a IB family element, a IIB family element, a VIIB family element, a VIII family element and a La family element, steeping the formed material obtained in step (1), and drying; and (3) activating the formed material treated in step (2) in a CO2 or H2O atmosphere to obtain the environment-friendly active carbon catalyst.

The invention discloses a supported mercury remover. The active components at least comprise MSSH and carriers, wherein M is a metal which can generate a trivalent ion. The invention further discloses a preparation method of the mercury remover on the basis of the disclosure of the mercury remover. The mercury remover has a very high binding force for mercury, the binding strength between the mercury remover and mercury is stronger than that between the metal sulfide and mercury, and thus the problem of low utilization rate of metal sulfide in the mercury removing process, causing by the bad binding force between the metal sulfide and mercury and low mercury capacity during the mercury removing process, is solved.

The invention discloses a method for removing mercury from smoke in a coal fired power plant and a mercury removing agent used by the same. In the term of the weight percent, the mercury removing agent is prepared from cobalt oxide and copper chloride in a mass ratio of (5-10):1000 through mixing. The mercury removing agent adopted in the invention can be directly used in a limestone- gypsum wet desulphurization system, is simple in use and convenience for use without reconstructing the traditional equipment and is low in cost; and the method for removing mercury by using the mercury removingagent has the advantages of high mercury removing efficiency, difficulty in corrosion to the device, and no generation of secondary pollution, can be used for oxidizing NO in the smoke into NO2 easily dissolved into water, and realizes the effect of removing mercury and NOx simultaneously.

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.

The invention discloses a demercuration absorption liquid, wherein the demercuration absorption liquid is formed by mixing imidazolium ionic liquids and hydrogen peroxide with the mass ratio of 9: (10-20). The absorption liquid is high in efficiency, and has no pollution.

The invention relates to a magnetic adsorbent for removing Hg0 from flue gas and preparation and application of the magnetic adsorbent. The magnetic adsorbent is MagFeSi-Cu0. The preparation method includes the first step of putting Fe3O4 nano particles in deionized water, adding Na2SiO3, adding a mixture into ethyl alcohol, adding NH3*H2O for a sol-gel reaction, conducting steam treatment and conducting drying to obtain magnetic particles of a silicon dioxide coating; the second step of introducing copper nano particles into the surface of silicon iron and sintering the magnetic particles of the silicon dioxide coating and the silicon iron to obtain the magnetic adsorbent. The magnetic adsorbent is applied to removing Hg0 from the flue gas. An adsorbent of mercury is the magnetic adsorbent, the coal-fired flue gas passes through a filter material, the mercury in the flue gas is caught by the magnetic adsorbent in the filter material, a dry drum magnetic separator is used for adsorbent spending and flying ash extraction, the used magnetic adsorbent MagFeSi-Cu0 will be regenerated and cycled, and therefore use cost of the adsorbent will be lowered.

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.