59results about How to "High dechlorination efficiency" patented technology

The invention relates to a normal temperature dechlorinating agent, the dechlorination agent comprises an active ingredient and a carrier, the active ingredient comprises a admixture formed by active ZnO, Ca(OH) 2 or light weight CaCO3; the carrier comprises clay and aluminate cement. The invention also discloses the preparation method of the dechlorination agent, the normal temperature dechlorination agent prepared by the method can realize the dechlorination function of the dechlorination agent in normal temperature with relatively higher chloride content and higher dechlorination accuracy.

The invention discloses a nanometer Pd / Fe catalyst and an application of the nanometer Pd / Fe catalyst in catalytic dechlorination. The nanometer Pd / Fe is supported on a PVDF Al2O3 (polyvinylidene fluoride Al2O3) thin film, wherein the thin film is 0.1 to 0.3mm; every centimeter of the thin film contains 0.5 to 0.6 microgram of Fe, and the content of Pb is 0.5 to 0.6 percent of that of Fe.

The invention relates to a sea sand treatment process, which comprises the following steps: (1) screening: removing impurities such as shells, gravels and the like in raw sand through vibration screening; (2) dechlorinating: conveying the screened sea sand, soaking the sea sand into a dechlorinating agent, and dechlorinating by adopting an ozone aqueous solution; (3) sand washing: conveying the dechlorinated sea sand to a washing pool, and washing the sea sand with washing water; and (4) dehydrating: dehydrating the cleaned sea sand to obtain finished sand. According to the invention, the strong oxidizing property of the dechlorinating agent oxidizes the chlorine ions in the sea sand into chlorine gas and discharges the chlorine gas, so that the chlorine ions are separated from the sea sand, and the dechlorinating efficiency of the sea sand is improved along with the increase of the concentration of ozone water and the increase of the dechlorinating time; and the dechlorinated sea sandis flushed by utilizing the washing water to remove residual chlorine ions and part of soil in the sea sand, so that the content of the soil and the content of mud blocks are reduced while the chlorine ions in the sea sand are further reduced, and the effects of improving the sea sand purification efficiency and reducing the water consumption are achieved.

The invention discloses a method for removing chlorine from metallurgical slag. The method comprises the following production steps: S1: carrying out slurrying on chlorine-containing metallurgical slag by utilizing water; S2, adjusting the pH (Potential of Hydrogen) of a solution subjected to the slurrying; S3: adding an oxidant; S4: adding an alkali; S5: carrying out liquid-solid separation; S6:washing filter residues. When the whole method is used, the chlorine removing efficiency is high; insoluble substances including cuprous chloride and the like in the solution subjected to the slurrying are oxidized by utilizing the oxidant and then chlorine is brought into the solution in a form of salt through alkaline substances; meanwhile, valuable metal in the solution is precipitated into theresidues and then solid-liquid separation is carried out; the separation is relatively complete; treatment sediment comprises a chlorine-containing substance and the valuable metal , and the valuablemetal can be reutilized through subsequent substitution reaction; the whole method has low energy consumption and low cost; produced chlorine-removed copper dreg is separated out.

The invention relates to a chlorination section byproduct hydrogen chloride gas absorption and purification acid-forming system and process. The system comprises: a tail gas purification acid-formingdevice, which is used for absorbing byproduct hydrogen chloride gas into 31-33wt% hydrochloric acid containing free chlorine; a dechlorination washing device, which is used for dechlorinating the hydrochloric acid containing free chlorine to obtain 30-31wt% dechlorinated hydrochloric acid; and a desorption concentration device, which is used for desorbing one part of dechlorinated hydrochloric acid into hydrogen chloride gas, and performing absorption with the other part of dechlorinated hydrochloric acid to obtain 31-32wt% industrial-grade hydrochloric acid; wherein the tail gas purificationacid-forming device, the dechlorination washing device and the desorption concentration device are sequentially communicated. According to the invention, hydrogen chloride-containing waste gas generated by reaction in a chlorination reaction kettle can be absorbed and purified into industrial hydrochloric acid, so that the waste gas can be recycled, and the concept of energy conservation and environmental protection is met.

The invention discloses a method for removing chlorine in chlorinated organic pollutant through electrochemistry method, and the method comprises the following steps: using a three-electrode system which adopts glassy carbon electrode modified with core-shell nanoscale bimetallic Fe / Pd catalyst as working electrode to perform cyclic voltammetry sweep in a mixed solution of H2SO4 solution and CCl4and determine the range of hydrogen region; and (2) electrolyzing for a period of time in the mixed solution of H2SO4 solution and CCl4 under the constant potential according to the determined range of hydrogen region. The method uses couple corrosion between Pd and Fe so as to accelerate the adsorption of hydrogen on Pd, the method is applicable to the fast chlorine-removing of chlorinated organic material at room temperature and normal pressure under the strong acid condition and the dechlorination efficiency is high.

The invention discloses a method for removing chlorine from a zinc sulfate solution. The method comprises the following steps that concentrated sulfuric acid is added into the zinc sulfate solution toadjust the pH value; ascorbic acid is added, then cuprous oxide is added for dechlorination treatment to form a cuprous chloride precipitate, filtering is carried out, and then a filtrate is taken for later use; the cuprous chloride precipitate is washed by using absolute ethyl alcohol, and the washing liquid and the filtrate are combined to obtain a mixed solution; an equal volume of organic amine is added into the mixed solution, extraction is carried out, and standing and layering are carried out so as to obtain a zinc sulfate solution with the chlorine removed and a chlorine-rich organicphase; and a reverse extraction agent is used for reversely extracting the chlorine-rich organic phase, so that the chlorine and the organic phase are separated. According to the method, chlorine ionsin the zinc sulfate solution are effectively removed, the dechlorination efficiency is high, the process is simple, and the chlorine removal cost is reduced.

The invention belongs to the field of coal-fired flue gas treatment and relates to a method for desulfurized slurry dechlorination, in particular to a method comprising the steps that a flue gas desulfurization gypsum dehydration filter solution is adopted to be subjected to a reaction with ozone, chlorine gas is released, a dechlorinated filtering solution is sent back to an adsorption tower, and therefore the content of chlorine in slurry is lowered. The method has the advantages that the flue gas desulfurization gypsum dehydration filter solution is dechlorinated instead of directly dechlorinating slurry, and interference caused by desulfurized intermediate products in the desulfurized slurry to dechlorination is avoided; the ozone adopts air as raw materials, and no other raw materials are consumed; the ozone is used as an oxidizing agent for releasing chlorine gas, and the technology is simple; due to a bubbling reaction, the chlorine gas is released, the air achieves the air lifting effect, and gas flow power can be provided not by a vacuum pump; the purpose of controlling the content of chlorine ions in the desulfurized slurry is achieved satisfactorily.

The invention discloses an electrocatalytic reduction combined electrode and a preparation method and application thereof. The electrode is characterized in that a graphite felt is taken as a substrate, and a multiwalled carbon nanotube, a nickel metal layer and a palladium metal layer are deposited on the substrate sequentially. The method includes: firstly, preparing the multiwall carbon nanotube / graphite felt electrode; soaking the electrode in a nickel salt solution and forming the nickel metal layer on the surface of the electrode through high-temperature nitrogen reduction; forming the palladium metal layer through direct metal reduction in a palladium salt solution to obtain the nickel-palladium bimetal combined electrode. The combined electrode is high in catalytic activity and good in stability, and nitrobenzenes and chlorphenols in water can be subjected to electrocatalytic treatment rapidly and efficiently.

The invention relates to the field of material preparation and is aimed at providing a method for preparing an efficient electron-transfer Cu-modified C / TiO2 photocatalytic reduction material. Tetrabutyl titanate is adopted as a titanium source in the method. The method includes preparing a C-doped TiO2 catalyst through a sol-gel process; and then preparing a Cu-loaded TiO2 photocatalyst by utilizing a photo-reduction deposition process, thus forming a C / Cu structure on the surface of the catalyst, enhancing interface electron transfer effects of the Cu element and further improving photocatalytic performance. Visible light absorption of the catalyst is enhanced and photogenerated charge transfer is accelerated, thus achieving efficient utilization of photo-generated electrons. The method overcomes disadvantages that present intrinsic semiconductors or semiconductors doped with a single element have small visible light response and that photogenerated charges are liable to be compounded. The C-doped TiO2 is prepared under a condition of not adding an extra carbon source, the surface of the catalyst is loaded with a transition metal element in place of precious metals, and therefore the cost is low and the method is simple and easily repeated. The dechlorination efficiency of the prepared catalyst is greatly increased, and efficient dechlorination is achieved under the premise of no use of precious metals.

The invention discloses a preparation method of a porous carbon material. The preparation method comprises the following steps: stirring and mixing chlorinated polyvinyl chloride, alkali metal hydroxides and methacrylate copolymers in parts by weight, and extruding at the temperature of 190-210 DEG C to obtain a granulating material; then increasing the temperature of the granulating material from 25 DEG C to 800-900 DEG C in an inert gas atmosphere at two-stage heating rate for carbonization, and then reducing the temperature to 25 DEG C at the cooling rate of 20-40 DEG C / min to obtain a carbonized material; then immersing the carbonized material into an aromatic substance for 2-4 hours, then increasing the temperature from 25 DEG C to 900-1000 DEG C in the inert gas atmosphere at the two-stage heating rate, keeping constant temperature for 3-4 hours, and then reducing the temperature to 25 DEG C at the cooling rate of 15-30 DEG C / min to obtain the porous carbon material. The preparation method disclosed by the invention has the advantages of simple process, environmental protection, easiness for industrialization and stability in product property.

The invention relates to the technical field of wet smelting, and specifically relates to a preparation and regeneration method of a circulating copper salt dechlorinating agent. The preparation and regeneration method comprises the following steps: 1) preparation; 2) alkali washing; 3) rinsing; 4) dechlorination; 5) acid pickling; 6) regeneration; 7) copper deposition; 8) oxidation; and 9) leaching. The invention aims to provide the method for preparing the regenerated copper salt dechlorinating agent to solve the problems of process defects and deficiencies of an existing dechlorination technology of a chlorine-containing zinc sulfate solution, low dechlorination efficiency of a copper slag dechlorination method, insufficient self-yield of copper slag and copper salt and the like. The method can recycle the main component copper metal of the copper salt dechlorinating agent infinitely, and achieves the advantages of low production cost, relatively simple operation, recycling of the dechlorinated copper salt, good dechlorination effect and the like, so as to solve the deficiencies in the prior art.

The invention discloses Ni / Fe double-metal face-centered cubic crystal nano-particles and a preparing method and application thereof. The liquid phase reduction method is adopted, PVP is used as a stabilizer, NaBH4 is used as a reducing agent, ferrous ions and nickle ions are added step by step for reduction, prepared Ni / Fe double-metal nano-particles are of a regular face-centered cubic structure, particle size distribution is even, particle size is large than the surface area, stability is good, and the polymerism can not easily happen. The prepared nano-particles can effectively catalyze and degrade polychlorinated biphenyl. Needed reaction equipment of the nano-particles is simple, equipment cost is low, the preparation process is high in controllability and simple in operation, the reaction condition is mild, and further industrial production is possible.

The invention relates to a method for removing chloride ions from a zinc hydrometallurgy solution, belonging to the field of non-ferrous metallurgy. The method comprises the steps of adding a strong oxidant to the zinc hydrometallurgy solution, oxidizing chloride ions in the solution to molecular chlorine, then placing the solution under negative pressure environment, and enabling molecular chlorine dissolved in the solution in the form of chlorine to be escaped rapidly from the zinc hydrometallurgy solution to achieve the purpose of removing chloride ions in the solution. The method disclosed by the invention has the advantages of simple process, no complex equipment requirements, low cost, good dechlorination effect and the like, and has good industrial application prospects.

The invention discloses a method for producing mineral slag micropowder by using titanium extraction tailings in the technical fields of solid waste treatment and resource utilization. The method mainly comprises the following steps: firstly preparing a liquid phase activating agent, performing liquid phase activation on titanium extraction tailings by using the activating agent, performing dehydration on the activated titanium extraction tailings, performing crushing, performing calcination, and finally grinding the obtained tailings to obtain the mineral slag micropowder. The method providedby the invention has the following beneficial effects: firstly, liquid phase activation is performed on the titanium extraction tailings, so that very good dechlorination and decarburization effectscan be obtained at a lower calcination temperature, and at the same time, potential hydration activity of the titanium extraction tailings can be well maintained; then low-temperature calcination is performed on the titanium extraction tailings, and grinding is performed, so that the S95-grade mineral slag micropowder can be prepared, and the mineral slag micropowder is used in a project or sold;and the method has the advantages of high dechlorination efficiency, low treatment costs, a large processing amount, a short process, good environmental protection and a good energy saving effect, andthe product has certain added value and large market capacity, and is a very good path for large-scale consumption of the titanium extraction tailings.

The invention discloses a preparation method of a loaded type antichlor. According to the preparation method disclosed by the invention, activated carbon loaded with TC-F is prepared by adopting an impregnation method and is used for removing organic chlorides in light oil. It can be seen from an infrared spectroscopic analysis diagram and a scanning electron microscope measurement analysis result that after KOH is used for activating, the proportion of an ash substance in the activated carbon is reduced, so that pore passages of the activated carbon are sufficiently exposed, or the ash substance mixed in the activated carbon is dissolved, so that generation of new pore passages is promoted. The dechlorinating effect of the activated carbon loaded with the TC-F is superior to that of unloaded activated carbon; the total load rate of the activated carbon which is firstly activated by the KOH and then is loaded with the TC-F is higher than a sample only unloaded with the TC-F, and a dechlorinating effect is also better. An experimental result shows that the dechlorinating efficiency of the loaded type antichlor prepared by the preparation method reaches 94.84 percent.

The invention discloses an efficient household garbage incineration fly ash two-stage washing process. According to the efficient household garbage incineration fly ash two-stage washing process, electrolysis dechlorination is performed on effluent after second-stage rinsing, the chlorine content of the second-stage rinsing entering first-stage rinsing is reduced, meanwhile, medium-temperature electrolytic plate frame pressing filtering is adopted, the pressing filtering fly ash water content is controlled to be less than 25%, the dissolution and adsorption effects of bound water on chloride ions are reduced, so that the chloride ion content in fly ash after the second-stage rinsing is guaranteed to be less than 0.8%, and the requirements for entering a cement kiln are met; and meanwhile, according to the efficient household garbage incineration fly ash two-stage washing process, the chlorine ion dissolution process in the first-stage rinsing process is promoted by reducing the chlorine ion content in the second-stage rinsing pressing filtering effluent, and the efficient household garbage incineration fly ash two-stage washing process is one efficient and economical household garbage fly ash washing process.

The invention relates to a combined desalting and anti-corrosion method of a catalytic reforming device. According to the method, a dewatering dechlorination tank (7) is additionally arranged behind a stabilizing tower feeding pressurizing pump (6); after the dewatering by the dewatering dechlorination tank, the water content is less than or equal to 15 ug / g; the chloride content is less than or equal to 0.5ug / g; a water washing desalination device (5) is additionally arranged on a tower top liquefied gas tower return backflow flow process; a great number of NH3, H2S and HCl inorganic matters are removed through the water washing desalination device (5), so that the backflow total salt content is reduced to be within 1mg / L. The long-period stable operation of the catalytic reforming device is realized.

The invention discloses a preparation method of a porous carbon material. The preparation method comprises the following steps of blending polyvinylidene chloride, polyvinyl chloride, basic metal oxide and a processing aid, carrying out extrusion molding, carrying out charing and carrying out carbon deposition to obtain the porous carbon material. The preparation method solves the problem that the prior art for preparing a porous carbon material structure only by polyvinylidene chloride produces unstable chlorine atoms, easily produces hole-closing phenomenon and difficultly controls apertures and a specific surface area so that porous carbon material performance and stability are influenced, and also solves the problem that based on the prior art, in a polyvinylidene chloride and polyvinyl chloride thermolysis dechlorination process, poisonous and harmful HCl gas is produced, process time is long and energy consumption is high. The preparation method has the advantages of simple processes, environmental friendliness, easy industrialization and stable product performances.

The invention relates to a molecular sieve-based catalyst used for dechlorination of methane chloride. The molecular sieve-based catalyst is characterized by comprising a micropore molecular sieve carrier and an oxide of a transitional metal element; the molecular sieve-based catalyst is prepared through the following method: impregnating 1 g of dried micropore molecular sieve into a 50 ml nitrate ethyl alcohol solution, wherein the load quantity of the transitional metal accounts for 5 wt%; stirring at the room temperature, using a rotary evaporimeter for distillation until dried, then drying at the temperature of 80 to 120 DEG C for 8 to 12 hours, and roasting at the temperature of 500 to 600 DEG C for 4 to 8 hours inside a muffle furnace. The catalyst for dechlorination, provided by the invention, adopts an impregnation method to prepare a transitional metal loading type ZSM-5 catalyst. Through synergistic effect of the transitional metal and the molecular sieve, the dechlorination capability of a chlorine contained volatile organic compound is improved. The catalyst provided by the invention is used for removing chlorine in methane chloride.

The invention discloses a preparation method of a flower-like nano-palladium / foamed nickel electrocatalytic material and an application of the flower-like nano-palladium / foamed nickel electrocatalyticmaterial in electrocatalytic reduction dechlorination reaction. Foamed nickel serves as a substrate material, a palladium chloride solution serves as a reaction solution, and the flower-like nano-palladium / foamed nickel electro-catalytic material is prepared through a chemical replacement method. The preparation method comprises the steps: applying the prepared material to monochloroacetic acid and 2,4-dichlorphenoxyacetic acid, and dechlorinating; in an H-type three-electrode system, the prepared electrode material is used as a working electrode, platinum is used as a counter electrode, a saturated calomel electrode is used as a reference electrode, a cathode chamber solution of the system is a sodium salt solution, river water or tap water and monochloroacetic acid or 2,4-dichlorophenoxyacetic acid for dechlorination, an anode chamber solution is a sodium salt solution, river water or tap water, a dechlorination reaction is carried out for 1-3 h under a constant potential dechlorination method or a constant current dechlorination method, and the conversion rate of monochloroacetic acid or 2,4-dichlorophenoxyacetic acid reaches 90.0% or above. The preparation method has the characteristics that the preparation method of the electrode material is simple, the dechlorination efficiency is high, and the electrolyte solution of the dechlorination reaction is wide in source.

The invention belongs to the technical field of semiconductor photocatalysis and relates to a preparation method for a silicon photocatalyst with a 3D multilevel structure. A silicon pillar array is subjected to a cleaning process and then is etched under the water bath temperature at 30 DEG C. The multi-level silicon is acquired by regulating the etching time. The light absorption strength of the prepared multi-level silicon is high; the light current is -30mAcm<2> and is 7.5 times of the light current of the silicon pillar array; 4-chlorophenol is dechlorinated under the photoelectric combined action; the dechlorinating efficiency can reach 90% or more after reacting for 60min; high-efficient photoelectric catalytic capacity is represented; the preparation method has the advantages of mild reaction condition, simple and convenient preparation technique, low cost, short preparation period, easy control, and the like; the prepared multi-level silicon photocatalyst can effectively enhance the light absorption of the material, reduce the light reflection, increase the light absorbing efficiency, boost the separation of photoproduced electron and hole and increase the photocatalytic activity; the effect in photoelectrocatalytic dechlorinating is obvious.

The invention discloses an extraction dechlorination method for petroleum unpolymerized C5. The method includes: firstly adding the unpolymerized C5 raw material and an extractant into an extraction tower, conducting treatment by the extraction tower to obtain dechlorinated unpolymerized C5 with Cl less than or equal to 10ppm, treating the residual component by a resolving tower to obtain high chlorine unpolymerized C5 with an extractant content of less than or equal to 50ppm, discharging the residue which is mostly the extractant component from the bottom of the resolving tower and letting it re-enter the extraction tower for recycle through a feed pipeline. The method solves the problem of dechlorination of C5 petroleum resin as a low-end product, after dechlorination, the chlorine content is less than or equal to 10ppm, and the dechlorination efficiency is high. Compared with the traditional hydrodechlorination process, the method uses fewer equipment, is easy to operate, has low equipment requirement, prolongs the service life of the equipment, and has high safety grade.

The invention discloses a metal nanocrystal modified composite electrode and a preparation method thereof, and the preparation method comprises the following steps: (1) adding a plurality of metal precursors into a reduction solution, adding an end-capping reagent and a surface stabilizer, and carrying out a constant-temperature reduction reaction to obtain metal nanocrystals; (2) uniformly mixing metal nanocrystals and a catalytic carrier, and adding the mixture into the film forming solution to form a homogeneous modification solution; and (3) coating a flat electrode plate with the homogeneous modification liquid to form a homogeneous liquid film, and drying to form a modification film, thereby obtaining the metal nanocrystal modified composite electrode. The invention further discloses application of the metal nanocrystal modified composite electrode in electrodynamic force / electrocatalysis combined remediation of soil pollution, and chlorine-containing organic pollutants in soil can be efficiently removed.

The invention relates to a desulfurization slurry dechlorination method and belongs to the coal-fired flue gas processing field. Further, for removal of chloride ions in flue gas desulfurization slurry obtained through ammonium sulfate-limestone method, a mode is employed that the desulfurized gypsum dewatering filtrate is supplemented with ammonium sulfate and then is subjected to electrolysis, hydrogen and chlorine are released directly, chlorine is released further through a stirred tank, the filtrate for dechlorination is sent back to an absorbing tower, and therefore the chlorine content in the slurry is lowered. The beneficial effects are as follows: firstly, instead of direct slurry dechlorination, desulfurized gypsum dewatering filtrate is subjected to dechlorination, and interferences of desulphurization intermediates in desulfurization slurry to dechlorination are avoided; secondly, after the filtrate is concentrated through supplemented ammonium sulfate, an electrolytic method is employed directly for dechlorination and the flows are simple; thirdly, release of chlorine which is not released in time in an electrolytic bath is promoted with high-speed stirring of the stirred tank; fourthly, the problem of control of the chloride ion content in desulphurization slurry is solved well and waste water discharge is reduced.

The invention relates to a dechlorination and decarbonization method for titanium extraction tailings through cooperation of a multiphase reaction. The method comprises the following steps: (1) feeding titanium extraction tailings are into a fluidized bed reactor and feeding oxygen-containing gas into the fluidized bed reactor to be subjected to oxygen supply and carbon burning treatment, whereinthe oxygen-containing gas serves as fluidization gas at the same time, and the surface temperature of the titanium extraction tailings in the oxygen supply and carbon burning treatment process is controlled to range from 500 DEG C to 600 DEG C; and (2) maintaining feeding oxygen-containing gas, feeding low-temperature water vapor at the temperature of 150-200 DEG C into the fluidized bed reactor to generate corrosion evaporation on the surface of the titanium extraction tailings to achieve the dechlorination purpose, wherein the surface temperature of the titanium extraction tailings in the oxygen supply carbon burning and corrosion evaporation treatment process is controlled to range from 500 DEG C to 600 DEG C. The waste heat of the titanium extraction tailings is fully utilized, air isintroduced for fluidized reaction carbon burning, heating and decarburization, water vapor is added for corrosion evaporation dechlorination, and a fluidization treatment mode of tailing-air-water vapor multiphase flowing and multiphase interface reaction effect matching is established. The method can improve the dechlorination efficiency, enhance the activity of interfacial water and shorten thetreatment time.

The invention relates to a preparation method and an application of a polypyrrole-multiwalled carbon nanotube collaboratively-modified palladium-carried composite electrode and belongs to the technical field of electrochemical water treatment. The method comprises the following steps of: firstly ultrasonically dispersing carbon nanotubes after being pretreated into a volatile organic solvent to form carbon nanotube suspension liquid, soaking and lifting a Ti (titanium) net in the suspension liquid, and naturally drying the Ti net to ensure that the carbon nanotubes are dispersed on the surface of the Ti net; carrying out the electrochemical oxidization polymerization in a Py (polypyrrole) sulfuric acid solution to form polypyrrole, so as to obtain a polypyrrole-multiwalled nanotube modified membrane; finally electrically depositing Pd (palladium) in a PdCl2 solution to obtain the polypyrrole-multiwalled carbon nanotube-modified Pd-carried composite electrode. The electrode is used for electrically catalyzing and reducing chloride of chlorophenol in the water. Compared with a Pd / Ti electrode with no modified layer, the research shows that the electrode can rapidly and high-efficiently remove 2, 4-dichlorophen and pentachlorophenol and has universality. The prepared electrode is high in catalytic activity, good in stability, rapid and high-efficient for electrically catalyzing the chlorophenol in the water and promising in application prospect.

The invention relates to a household garbage gasification treatment system with a composite dechlorination function. The system comprises a gasification furnace and a composite dechlorination system,wherein the composite dechlorination system comprises a coarse chlorine filtration device and a cyclone separator dechlorination device, the coarse chlorine filtration device comprises a plurality offiltering plates arranged in the gasification furnace from top to bottom and a calcium spraying port formed in the gasification furnace, one end of the filtering plate is connected with the gasification furnace, the filtering plate inclines downwards from the fixed end to the free end, the gasification furnace comprises a gasification reaction layer and a filter layer for placing the coarse chlorine filtration device, the filter layer is arranged at the top of the gasification reaction layer, and the calcium spraying port is arranged at the gasification reaction layer. According to the invention, after combustible gas is generated in a gasification furnace, the combustible gas can be directly subjected to deep dechlorination, so that high-temperature corrosion of the combustible gas to subsequent equipment is avoided so as to improve the steam parameters and the power generation efficiency and easily reduce the low-temperature heterogeneous catalytic synthesis of dioxin in the flue gascooling process.