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CN110975541A - Treatment device and method for VOCs-containing sintering flue gas - Google Patents

Treatment device and method for VOCs-containing sintering flue gas Download PDF

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Publication number
CN110975541A
CN110975541A CN201911330338.2A CN201911330338A CN110975541A CN 110975541 A CN110975541 A CN 110975541A CN 201911330338 A CN201911330338 A CN 201911330338A CN 110975541 A CN110975541 A CN 110975541A
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China
Prior art keywords
flue gas
vocs
plasma reaction
combustion
plasma
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Inventor
胡小吐
刘勇
钟璐
胡静龄
杨颖欣
杨森林
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Guangdong Jiade Environmental Protection Technology Co Ltd
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Guangdong Jiade Environmental Protection Technology Co Ltd
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
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    • B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
    • B01D53/323—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00 by electrostatic effects or by high-voltage electric fields
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    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
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    • B01D53/1456—Removing acid components
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    • B01D53/18—Absorbing units; Liquid distributors therefor
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
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    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
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    • F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
    • F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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Abstract

The invention provides a treatment device for VOCs-containing sintering flue gas, which comprises a plasma reaction device, a combustion device and an absorption device, wherein a discharge electrode is arranged in the plasma reaction device, the discharge electrode is connected with a discharge power supply arranged outside the plasma reaction device, an outlet of the plasma reaction device is connected with an inlet of the combustion device, and an outlet of the combustion device is connected with an inlet of the absorption device. The invention converts VOCs in the flue gas into harmless gas and converts low-price NO into harmless gas by arranging the plasma reaction device and the combustion devicexOxidation to facilitate final SO2And NOxThe absorption of the catalyst realizes the simultaneous removal of organic and inorganic components in the flue gas, the removal rate of VOCs reaches more than 98 percent, and the plasma oxidation reaction is carried out, thereby greatly reducing the difficulty of the combustion reaction and reducing the generation of secondary harmful products; the device has the advantages of simple structure, low equipment cost and energy consumption and wide application prospect.

Description

Treatment device and method for VOCs-containing sintering flue gas
Technical Field
The invention belongs to the technical field of flue gas treatment, and relates to a treatment device and a treatment method for sintering flue gas containing VOCs.
Background
The industrial production of fossil fuel combustion, metal smelting and the like can generate a large amount of flue gas except common SO2With NOxSuch inorganic gaseous pollutants often contain organic pollutants, and Volatile Organic Compounds (VOCs) are a general term for a large group of organic pollutants. At present, the serious environmental problems caused by gas pollution, such as haze, acid rain, photochemical smog and the like, except SO2With NOxAnd the pollutants are also related to the emission of the VOCs and the generation of secondary products thereof, particularly the generation of haze and photochemical smog, and the emission of the VOCs is relatively high, so that the human health and living environment are seriously endangered, and therefore, the smoke containing the VOCs needs to be subjected to desulfurization and denitrification treatment and also needs to be subjected to VOCs gas removal before being discharged.
At present, the purification process of VOCs mainly comprises three methods, namely a physical method, a chemical method and a biological method, but the methods have defects of the methods. The physical method mainly adopts an adsorbent to adsorb the VOCs so as to concentrate and collect the VOCs, but the adsorbent needs to be regenerated or even replaced regularly, so that the operation cost is increased; the chemical method is to convert VOCs by adopting chemical reaction, so that the required energy consumption is high, and secondary pollution is easy to generate; the biological principle is to degrade the VOCs by using microorganisms, but the biological principle has higher requirements on the tested VOCs, including degradability, water solubility, toxicity to the microorganisms and the like, is greatly influenced by environmental conditions, and is less in application at present. Therefore, research is currently focused on chemical approaches to the conversion and removal of VOCs.
CN 107081036A discloses a dust removal purification device and method for VOCs by ultraviolet activated ozone oxidation, wherein the device sequentially comprises an ultraviolet excitation area, a particle conversion area and a dust removal area according to the gas flow direction; an ultraviolet lamp is arranged in the ultraviolet excitation area and is used for carrying out ultraviolet excitation on oxygen and VOCs in the mixed gas; the volume of the particle conversion zone is larger than that of the ultraviolet excitation zone, and the ozone and VOCs after being excited by ultraviolet react in the particle conversion zone to convert the VOCs into solid particles; the dust removing area is internally provided with dust removing equipment, and solid particles converted from the VOCs are removed by the dust removing equipment; the device converts oxygen into ozone by ultraviolet excitation, but VOCs are not completely decomposed or converted by treatment, and formed solid particles easily cause secondary pollution and need to be treated again.
CN 203549850U discloses an organic waste gas comprehensive treatment system, which comprises a raw material storage tank of an oil refinery, a desulfurization reactor, a sewage treatment field, a gas mixing tank, a heat storage combustion reactor and a steam generator; the waste gas discharge pipeline of raw materials storage tank is through gas pump and desulfurization reactor access connection, desulfurization reactor export and gas mixing tank access connection, and the gas collecting house steward of sewage treatment field is through bleed fan and gas mixing tank access connection, and gas mixing tank export and heat accumulation combustion reactor access connection, heat accumulation combustion reactor upper portion are connected with steam generator, and the heat accumulation combustion reactor export links to each other with exhaust duct. The device mainly adopts the combustion method to fully transform organic waste gas, but organic waste gas often has complicated components, easily generates toxic and harmful secondary products during combustion, and has higher required energy consumption.
In summary, for the treatment of flue gas containing VOCs, it is necessary to completely decompose or convert the organic components as much as possible, without generating secondary harmful products, and at the same time, to treat the inorganic components, thereby simplifying the treatment process of flue gas.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a device and a method for treating sintering flue gas containing VOCs, wherein the device can completely convert VOCs in the flue gas into harmless gas and can convert low-price NO into low-price NO through the arrangement of a plasma reaction device and a combustion devicexOxidation to facilitate final SO2And NOxThe absorption of the organic and inorganic components in the sintering flue gas can be simultaneously removed.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a treatment device for VOCs-containing sintering flue gas, which comprises a plasma reaction device, a combustion device and an absorption device, wherein a discharge electrode is arranged in the plasma reaction device, the discharge electrode is connected with a discharge power supply arranged outside the plasma reaction device, an outlet of the plasma reaction device is connected with an inlet of the combustion device, and an outlet of the combustion device is connected with an inlet of the absorption device.
In the invention, SO is removed from sintering flue gas2And NOxThe device utilizes the high activity and the oxidability of plasma to rapidly decompose VOCs and convert the VOCs into combustible micromolecules by arranging a plasma reaction device and a combustion device, and partial components can be completely converted into CO2And H2O, the difficulty of combustion reaction is greatly reduced, and the generation of secondary harmful products is reduced; meanwhile, in the plasma reaction stage, low-valence nitrogen oxides such as NO are oxidized and are convenient to react with SO in the absorption device2The residual gas can reach the standard and be discharged after the absorption; the deviceSimple structure, low operation cost, removal of organic and inorganic components in the sintering flue gas at one time, and wide application prospect.
The following technical solutions are preferred technical solutions of the present invention, but not limited to the technical solutions provided by the present invention, and technical objects and advantageous effects of the present invention can be better achieved and achieved by the following technical solutions.
In a preferred embodiment of the present invention, the plasma reactor includes a streamer discharge plasma reactor.
Preferably, the plasma reaction device is further provided with a grounding electrode, and the grounding electrode is arranged around the discharge electrode.
Preferably, the discharge electrode is connected to a positive electrode of a discharge power source, and the ground electrode is connected to a negative electrode of the discharge power source.
In the invention, the key of the plasma reactor is that the discharge electrode generates high-energy electrons by streamer corona under the condition of applying high voltage to break O2、H2The molecular bonds of O and other substances form active free radicals or ions, so that subsequent chemical reaction is initiated, and therefore, the position relation and related parameters of the discharge power supply and the discharge electrode can be reasonably set according to needs.
In a preferred embodiment of the present invention, the combustion apparatus includes a regenerative combustion furnace or a catalytic combustion furnace.
Preferably, a heat accumulator is arranged in the heat accumulation combustion furnace.
Preferably, the catalytic combustor is charged with a catalyst.
In the invention, the regenerative combustion furnace and the catalytic combustion furnace are two combustion devices of different types, the regenerative combustion furnace has higher temperature and is suitable for treating organic waste gas with large air volume and low concentration, the regenerative combustion furnace is provided with a heat accumulator, an additional heat source is not needed, and the heat carried by the heat accumulator can be used for the optimized utilization of the heat inside and outside the system; the temperature required by the catalytic combustion furnace is low, secondary harmful products cannot be generated, and the purification efficiency is high.
In a preferred embodiment of the present invention, the absorption device includes a spray absorption tower.
In the invention, the spray absorption tower can absorb sulfur and nitrate to absorb SO in the flue gas2And NO after oxidationxAbsorbing and realizing desulfurization and denitrification treatment.
Preferably, at least one spray header is arranged at the top of the spray absorption tower, for example, one, two, three or four spray headers are arranged, and the specific quantity is selected according to the size of the spray absorption tower and the smoke treatment capacity.
Preferably, the middle part of the spraying absorption tower is provided with a liquid distributor which is mainly used for redispersing the spraying liquid in the middle part of the absorption tower, so that the spraying liquid is in full contact with the flue gas, and the absorption efficiency is improved.
Preferably, the bottom liquid outlet and the top liquid inlet of the spray absorption tower are connected through a pipeline outside the spray absorption tower.
As a preferable technical scheme of the invention, the device also comprises a dust removal device, and the dust removal device is arranged in front of the plasma reaction device.
Preferably, the dust removing device comprises any one of a cyclone dust collector, a bag dust collector or an electric dust collector, or a combination of at least two of the following, typical but non-limiting examples being: the combination of a cyclone dust collector and a bag type dust collector, the combination of a bag type dust collector and an electric dust collector, the combination of a cyclone dust collector, a bag type dust collector and an electric dust collector and the like.
According to the invention, the sintering flue gas passes through the dust removal device to remove most of dust particles, so that the generation of active free radicals and reaction influence of the particles on the plasma reaction device are avoided.
In another aspect, the present invention provides a method for treating sintering flue gas containing VOCs by using the above apparatus, the method comprising:
(1) introducing sintering flue gas containing VOCs to be treated into a plasma reaction device, and carrying out oxidation reaction on the VOCs and NO under the action of plasma;
(2) carrying out combustion reaction on the flue gas reacted in the step (1), and completely converting the residual VOCs;
(3) and (3) absorbing the flue gas reacted in the step (2) by adopting an absorption liquid to obtain purified flue gas.
As a preferred embodiment of the present invention, the VOCs in the sintering flue gas in step (1) include any one or a combination of at least two of benzene, acetone, carbon disulfide, or methyl chloride, and the combination is exemplified by, but not limited to: combinations of benzene and acetone, combinations of carbon disulfide and methyl chloride, combinations of benzene, acetone and carbon disulfide, and the like.
In the invention, the VOCs comprise various types of organic matters and can be mainly divided into monocyclic aromatic hydrocarbons, oxygen-containing compounds, sulfur-containing compounds and halogenated aliphatic compounds, and the listed components are main components with relatively high content.
Preferably, the concentration of VOCs in the sintering flue gas is 1-10 mg/m3For example 1mg/m3、2mg/m3、3mg/m3、5mg/m3、6mg/m3、8mg/m3Or 10mg/m3And the like, but are not limited to the recited values, and other values not recited within the numerical range are also applicable.
Preferably, the sintering flue gas also comprises SO2、NOx、O2And dust;
preferably, O in the sintering flue gas2The content of (b) is 3 to 8% by volume, for example, 3%, 4%, 5%, 6%, 7%, or 8%, but is not limited to the recited values, and other values not recited in the above numerical range are also applicable.
In the invention, the sintering flue gas needs to have certain oxygen content, which is not only beneficial to generating plasma active substances in a plasma reaction device, but also beneficial to smoothly carrying out the post-combustion reaction.
Preferably, before the sintering flue gas is introduced into the plasma reaction device, dust removal treatment is performed.
In a preferred embodiment of the present invention, when the plasma reaction apparatus described in the step (1) is operated, the voltage applied to the discharge electrode is 20 to 80kV, for example, 20kV, 30kV, 40kV, 50kV, 60kV, 70kV or 80kV, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
Preferably, streamer discharge occurs after a voltage is applied across the discharge electrode, and the active species generated include electrons, ions, and radicals.
Preferably, the active material completely oxidizes or decomposes VOCs into small organic molecules.
In the invention, after plasma oxidation treatment, part of VOCs components in the flue gas are completely oxidized and converted into inorganic molecules such as H2O and CO2, but part of VOCs components are not completely oxidized and only partially decomposed to generate micromolecular organic matters.
In a preferred embodiment of the present invention, the combustion reaction in step (2) is carried out in a regenerative furnace or a catalytic furnace.
Preferably, the reaction temperature of the flue gas in the regenerative furnace is 800 to 1000 ℃, for example 800 ℃, 850 ℃, 900 ℃, 950 ℃ or 1000 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the reaction temperature of the flue gas in the catalytic combustion furnace is 250 to 500 ℃, for example 250 ℃, 300 ℃, 350 ℃, 400 ℃, 450 ℃ or 500 ℃, but is not limited to the recited values, and other values not recited in the range of the values are also applicable.
Preferably, the catalyst in the catalytic combustor comprises a transition metal oxide catalyst, preferably a composite oxide catalyst.
In the present invention, the catalyst for catalytic combustion of organic exhaust gas mainly comprises manganese-based, copper-based and rare earth metal oxide catalysts, and the composite oxide is preferably selected from catalysts having a specific crystal phase structure, such as perovskite-type composite oxide or spinel-type composite oxide.
As a preferable technical scheme of the invention, the absorption liquid in the step (3) is in countercurrent contact with the flue gas in a spraying mode for absorption.
Preferably, the absorbing solution of step (3) comprises an alkaline solution.
Preference is given toIn step (3), the absorption liquid comprises Ca (OH)2Any one of solutions, NaOH solutions or ammonia or a combination of at least two of these, typical but non-limiting examples being: ca (OH)2Combination of the solution and NaOH solution, combination of NaOH solution and aqueous ammonia, Ca (OH)2Solutions, combinations of NaOH solutions and ammonia, and the like.
Preferably, the absorbing solution in step (3) is recycled until the salt concentration reaches 40-60 wt%, such as 40 wt%, 45 wt%, 48 wt%, 50 wt%, 54 wt%, 57 wt% or 60 wt%, but not limited to the recited values, and other values in the range are also applicable.
Compared with the prior art, the invention has the following beneficial effects:
(1) the device converts VOCs in the flue gas into harmless gas and converts low-price NO into harmless gas by arranging the plasma reaction device and the combustion devicexOxidation to facilitate final SO2And NOxThe absorption of the method realizes the simultaneous removal of organic and inorganic components in the sintering flue gas, and the removal rate of VOCs reaches more than 98 percent;
(2) the device disclosed by the invention carries out plasma oxidation reaction, so that the difficulty of combustion reaction is greatly reduced, and the generation of secondary harmful products is reduced;
(3) the device has the advantages of simple structure, low equipment cost and energy consumption and wide application prospect.
Drawings
FIG. 1 is a schematic structural diagram of a VOCs-containing sintering flue gas treatment device provided in example 1 of the present invention;
the device comprises a dust removal device 1, a plasma reaction device 2, a discharge electrode 21, a grounding electrode 22, a combustion device 3 and an absorption device 4.
Detailed Description
In order to better illustrate the present invention and facilitate the understanding of the technical solutions of the present invention, the present invention is further described in detail below. However, the following examples are only simple examples of the present invention and do not represent or limit the scope of the present invention, which is defined by the claims.
The invention provides a device and a method for treating VOCs-containing sintering flue gas, the device comprises a plasma reaction device 2, a combustion device 3 and an absorption device 4, a discharge electrode 21 is arranged in the plasma reaction device 2, the discharge electrode 21 is connected with a discharge power supply arranged outside the plasma reaction device 2, an outlet of the plasma reaction device 2 is connected with an inlet of the combustion device 3, and an outlet of the combustion device 3 is connected with an inlet of the absorption device 4.
The method comprises the following steps:
(1) introducing sintering flue gas containing VOCs to be treated into a plasma reaction device, and carrying out oxidation reaction on the VOCs and NO under the action of plasma;
(2) carrying out combustion reaction on the flue gas reacted in the step (1), and completely converting the residual VOCs;
(3) and (3) absorbing the flue gas reacted in the step (2) by adopting an absorption liquid to obtain purified flue gas.
The following are typical but non-limiting examples of the invention:
example 1:
the embodiment provides a processing apparatus for VOCs-containing sintering flue gas, the structural schematic diagram of the apparatus is shown in FIG. 1, and the apparatus comprises a plasma reaction apparatus 2, a combustion apparatus 3 and an absorption apparatus 4, a discharge electrode 21 is arranged in the plasma reaction apparatus 2, the discharge electrode 21 is connected with a discharge power supply arranged outside the plasma reaction apparatus 2, an outlet of the plasma reaction apparatus 2 is connected with an inlet of the combustion apparatus 3, and an outlet of the combustion apparatus 3 is connected with an inlet of the absorption apparatus 4.
The plasma reaction device 2 comprises a streamer discharge plasma reactor.
The plasma reaction device 2 is further provided with a ground electrode 22, and the ground electrode 22 is disposed around the discharge electrode 21.
The discharge electrode 21 is connected to the positive electrode of a discharge power supply, and the ground electrode 22 is connected to the negative electrode of the discharge power supply.
The combustion device 3 comprises a heat storage combustion furnace, and a heat accumulator is arranged in the heat storage combustion furnace.
The absorption device 4 comprises a spray absorption tower, three spray headers are arranged at the top of the spray absorption tower, and a liquid distributor is arranged in the middle of the spray absorption tower.
And the bottom liquid outlet and the top liquid inlet of the spray absorption tower are connected through a pipeline outside the spray absorption tower.
The device also comprises a dust removal device 1, wherein the dust removal device 1 is arranged in front of the plasma reaction device 2; the dust removing device 1 is a bag type dust remover.
Example 2:
the embodiment provides a processing apparatus who contains VOCs sintering flue gas, the device includes plasma reaction unit 2, burner 3 and absorbing device 4, be equipped with discharge electrode 21 in the plasma reaction unit 2, discharge electrode 21 links to each other with the outer discharge power who sets up of plasma reaction unit 2, the export of plasma reaction unit 2 links to each other with burner 3's entry, burner 3's export links to each other with absorbing device 4's entry.
The plasma reaction device 2 comprises a streamer discharge plasma reactor.
The plasma reaction device 2 is further provided with a ground electrode 22, and the ground electrode 22 is disposed around the discharge electrode 21.
The discharge electrode 21 is connected to the positive electrode of a discharge power supply, and the ground electrode 22 is connected to the negative electrode of the discharge power supply.
The combustion device 3 comprises a catalytic combustion furnace, and a catalyst is filled in the catalytic combustion furnace.
The absorption device 4 comprises a spray absorption tower, five spray headers are arranged at the top of the spray absorption tower, and a liquid distributor is arranged in the middle of the spray absorption tower.
And the bottom liquid outlet and the top liquid inlet of the spray absorption tower are connected through a pipeline outside the spray absorption tower.
The device also comprises a dust removal device 1, wherein the dust removal device 1 is arranged in front of the plasma reaction device 2; the dust removing device 1 is an electric dust remover.
Example 3:
the embodiment provides a method for treating sintering flue gas containing VOCs, which is implemented by adopting the device in embodiment 1 and comprises the following steps:
(1) firstly, dedusting sintering flue gas containing VOCs to be treated, wherein the concentration of the VOCs in the sintering flue gas is 5mg/m3And also contains SO2、NOxAnd O2，O2The volume content of the active substance is 5 percent, then the active substance is introduced into a plasma reaction device 2, 50kV voltage is applied to a discharge electrode 21 to generate streamer discharge, the generated active substance has electrons, ions and free radicals, and under the action of the active substance, VOCs and NO are subjected to oxidation reaction;
(2) carrying out combustion reaction on the flue gas reacted in the step (1) in a regenerative combustion furnace at the reaction temperature of 800 ℃, and converting the residual VOCs reacted in the step (1) into CO2And H2O；
(3) Absorbing the flue gas reacted in the step (2) by adopting absorption liquid to contact with the flue gas in a countercurrent way in a spraying way, wherein the absorption liquid is Ca (OH)2And (4) obtaining purified flue gas by using the solution, and recycling the absorption solution until the salt concentration reaches 50 wt% for recovery.
In the embodiment, the method can fully remove VOCs in the sintering flue gas, the removal rate can reach 98.2%, no secondary harmful product is generated in the treatment process, and SO in the flue gas is generated at the same time2And NOxCan also be fully removed, and can remove organic and inorganic components in the sintering flue gas at one time, and the emission reaches the standard.
Example 4:
the embodiment provides a method for treating sintering flue gas containing VOCs, which is implemented by adopting the device in embodiment 1 and comprises the following steps:
(1) firstly, dedusting sintering flue gas containing VOCs to be treated, wherein the concentration of VOCs in the sintering flue gas is 8mg/m3And also contains SO2、NOxAnd O2，O2Is 8 percent, then is introduced into a plasma reaction device 2, and is applied on a discharge electrode 21Streamer discharge is generated at the voltage of 80kV, the generated active substances comprise electrons, ions and free radicals, and VOCs and NO are subjected to oxidation reaction under the action of the active substances;
(2) carrying out combustion reaction on the flue gas reacted in the step (1) in a regenerative combustion furnace at the reaction temperature of 1000 ℃, and converting the residual VOCs reacted in the step (1) into CO2And H2O；
(3) And (3) absorbing the flue gas reacted in the step (2) by adopting absorption liquid to be in countercurrent contact with the flue gas in a spraying mode, wherein the absorption liquid is ammonia water solution to obtain purified flue gas, and the absorption liquid is recycled until the salt concentration reaches 60 wt% for recovery.
In the embodiment, the method can fully remove VOCs in the sintering flue gas, the removal rate can reach 98.8%, no secondary harmful product is generated in the treatment process, and SO in the flue gas is generated at the same time2And NOxCan also be fully removed, and can remove organic and inorganic components in the sintering flue gas at one time, and the emission reaches the standard.
Example 5:
the embodiment provides a method for treating sintering flue gas containing VOCs, which is implemented by adopting the device in the embodiment 2 and comprises the following steps:
(1) firstly, dedusting sintering flue gas containing VOCs to be treated, wherein the concentration of the VOCs in the sintering flue gas is 1mg/m3And also contains SO2、NOxAnd O2，O2The volume content of the active substance is 3 percent, then the active substance is introduced into a plasma reaction device 2, 20kV voltage is applied to a discharge electrode 21 to generate streamer discharge, the generated active substance has electrons, ions and free radicals, and under the action of the active substance, VOCs and NO are subjected to oxidation reaction;
(2) carrying out combustion reaction on the flue gas reacted in the step (1) in a catalytic combustion furnace at the reaction temperature of 300 ℃, wherein the catalyst filled in the catalytic combustion furnace is a copper manganese spinel catalyst, and converting the residual VOCs reacted in the step (1) into CO2And H2O；
(3) And (3) absorbing the flue gas reacted in the step (2) by adopting absorption liquid to perform countercurrent contact with the flue gas in a spraying mode, wherein the absorption liquid is ammonia water and NaOH solution with the volume ratio of 1:1 to obtain purified flue gas, and the absorption liquid is recycled until the salt concentration reaches 40 wt% for recovery.
In the embodiment, the method can fully remove VOCs in the sintering flue gas, the removal rate can reach 98.5%, no secondary harmful product is generated in the treatment process, and SO in the flue gas is generated at the same time2And NOxCan also be fully removed, and can remove organic and inorganic components in the sintering flue gas at one time, and the emission reaches the standard.
Example 6:
the embodiment provides a method for treating sintering flue gas containing VOCs, which is implemented by adopting the device in the embodiment 2 and comprises the following steps:
(1) firstly, dedusting sintering flue gas containing VOCs to be treated, wherein the concentration of the VOCs in the sintering flue gas is 3mg/m3And also contains SO2、NOxAnd O2，O2The volume content of the active substance is 6 percent, then the active substance is introduced into a plasma reaction device 2, 40kV voltage is applied to a discharge electrode 21 to generate streamer discharge, the generated active substance has electrons, ions and free radicals, and under the action of the active substance, VOCs and NO are subjected to oxidation reaction;
(2) carrying out combustion reaction on the flue gas reacted in the step (1) in a catalytic combustion furnace at the reaction temperature of 450 ℃, wherein the catalyst filled in the catalytic combustion furnace is a cerium-zirconium solid solution catalyst, and converting the residual VOCs reacted in the step (1) into CO2And H2O；
(3) And (3) absorbing the flue gas reacted in the step (2) by adopting absorption liquid to perform countercurrent contact with the flue gas in a spraying mode, wherein the absorption liquid is NaOH solution to obtain purified flue gas, and the absorption liquid is recycled until the salt concentration reaches 45 wt% for recovery.
In the embodiment, the method can fully remove VOCs in the sintering flue gas, the removal rate can reach 98.4%, no secondary harmful product is generated in the treatment process, and SO in the flue gas is generated at the same time2And NOxCan also be fully removed, and the sintering smoke is contained in the sintering smokeAnd removing inorganic components, and discharging after reaching the standard.
In combination with the above embodiments, the device of the present invention converts the VOCs in the flue gas into harmless gases and converts low-priced NO through the arrangement of the plasma reaction device and the combustion devicexOxidation to facilitate final SO2And NOxThe absorption of the method realizes the simultaneous removal of organic and inorganic components in the sintering flue gas, and the removal rate of VOCs reaches more than 98 percent; according to the invention, the plasma oxidation reaction is carried out firstly, so that the difficulty of the combustion reaction is greatly reduced, and the generation of secondary harmful products is reduced; the device has the advantages of simple structure, low equipment cost and energy consumption and wide application prospect.
The applicant states that the present invention is illustrated by the detailed apparatus and method of the present invention through the above embodiments, but the present invention is not limited to the above detailed apparatus and method, i.e. it is not meant to imply that the present invention must be implemented by the above detailed apparatus and method. It will be apparent to those skilled in the art that any modifications to the present invention, equivalents of the means for substitution and addition of means for carrying out the invention, selection of specific means, etc., are within the scope and disclosure of the invention.

Claims (10)

1. The utility model provides a processing apparatus who contains VOCs sintering flue gas, its characterized in that, the device includes plasma reaction unit, burner and absorbing device, be equipped with the discharge electrode in the plasma reaction unit, the discharge electrode links to each other with the outer discharge power who sets up of plasma reaction unit, the export of plasma reaction unit links to each other with burner's entry, burner's export links to each other with absorbing device's entry.
2. The processing apparatus of claim 1, wherein the plasma reaction apparatus comprises a streamer discharge plasma reactor;
preferably, the plasma reaction device is further provided with a grounding electrode, and the grounding electrode is arranged around the discharge electrode;
preferably, the discharge electrode is connected to a positive electrode of a discharge power source, and the ground electrode is connected to a negative electrode of the discharge power source.
3. The processing apparatus according to claim 1 or 2, wherein the combustion apparatus comprises a regenerative combustion furnace or a catalytic combustion furnace;
preferably, a heat accumulator is arranged in the heat accumulation combustion furnace;
preferably, the catalytic combustor is charged with a catalyst.
4. The process arrangement according to any one of claims 1 to 3, wherein the absorption device comprises a spray absorption tower;
preferably, at least one spray header is arranged at the top of the spray absorption tower;
preferably, a liquid distributor is arranged in the middle of the spray absorption tower;
preferably, the bottom liquid outlet and the top liquid inlet of the spray absorption tower are connected through a pipeline outside the spray absorption tower.
5. The processing apparatus according to any one of claims 1 to 4, wherein the apparatus further comprises a dust removing device disposed before the plasma reaction apparatus;
preferably, the dust removing device comprises any one of a cyclone dust remover, a bag type dust remover or an electric dust remover or a combination of at least two of the cyclone dust remover, the bag type dust remover and the electric dust remover.
6. A method for treating sintering flue gas containing VOCs by using the device of any one of claims 1 to 5, characterized in that the method comprises the following steps:
(1) introducing sintering flue gas containing VOCs to be treated into a plasma reaction device, and carrying out oxidation reaction on the VOCs and NO under the action of plasma;
(2) carrying out combustion reaction on the flue gas reacted in the step (1), and completely converting the residual VOCs;
(3) and (3) absorbing the flue gas reacted in the step (2) by adopting an absorption liquid to obtain purified flue gas.
7. The method according to claim 6, wherein the VOCs in the sintering flue gas of step (1) comprise any one or a combination of at least two of benzene, acetone, carbon disulfide or methyl chloride;
preferably, the concentration of VOCs in the sintering flue gas is 1-10 mg/m3；
Preferably, the sintering flue gas also comprises SO2、NOx、O2And dust;
preferably, O in the sintering flue gas2The volume content of (a) is 3-8%;
preferably, before the sintering flue gas is introduced into the plasma reaction device, dust removal treatment is performed.
8. The method according to claim 6 or 7, wherein in the step (1), when the plasma reaction device is operated, the voltage applied to the discharge electrode is 20-80 kV;
preferably, streamer discharge occurs after a voltage is applied to the discharge electrode, and the generated active substances include electrons, ions and radicals;
preferably, the active material completely oxidizes or decomposes VOCs into small organic molecules.
9. The method according to any one of claims 6 to 8, wherein the combustion reaction of step (2) is carried out in a regenerative furnace or a catalytic furnace;
preferably, the reaction temperature of the flue gas in the heat storage combustion furnace is 800-1000 ℃;
preferably, the reaction temperature of the flue gas in the catalytic combustion furnace is 250-500 ℃;
preferably, the catalyst in the catalytic combustor comprises a transition metal oxide catalyst, preferably a composite oxide catalyst.
10. The method according to any one of claims 6 to 9, wherein the absorption liquid in the step (3) is absorbed by being contacted with the flue gas in a counter-current manner in a spraying manner;
preferably, the absorption liquid of step (3) comprises an alkaline solution;
preferably, the absorption liquid in step (3) comprises Ca (OH)2Any one or the combination of at least two of solution, NaOH solution and ammonia water;
preferably, the absorption liquid in the step (3) is recycled until the salt concentration reaches 40-60 wt%.
CN201911330338.2A 2019-12-20 2019-12-20 Treatment device and method for VOCs-containing sintering flue gas Pending CN110975541A (en)

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Application publication date: 20200410