CN109908719A - A kind of process removing heavy metal in flue gas lead - Google Patents

A kind of process removing heavy metal in flue gas lead Download PDF

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Publication number
CN109908719A
CN109908719A CN201910269652.8A CN201910269652A CN109908719A CN 109908719 A CN109908719 A CN 109908719A CN 201910269652 A CN201910269652 A CN 201910269652A CN 109908719 A CN109908719 A CN 109908719A
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flue gas
lead
sodium bicarbonate
heavy metal
oxidation
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李建军
马晓文
郭家秀
刘勤
岑望来
刘勇军
楚英豪
袁山东
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Sichuan University
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Sichuan University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/64—Heavy metals or compounds thereof, e.g. mercury
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—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
    • 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
    • B01D53/504—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 device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/508—Sulfur oxides by treating the gases with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • B01D53/82—Solid phase processes with stationary reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/30—Sulfur compounds
    • B01D2257/302—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/60—Heavy metals or heavy metal compounds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Abstract

The invention discloses a kind of process for removing heavy metal in flue gas lead, take using sodium bicarbonate as particulate form lead Pb in absorption flue gaspBed, utilize the gap absorption particulate form lead Pb of the sodium carbonate that reacts with smoke gas pyrolysis of sodium bicarbonatep, make element state lead Pb in flue gas using the active oxidation substance that oxidation reaction generates0It is converted into oxidation state lead Pb2+, come into full contact with using the mixed liquor that the sodium bicarbonate after sodium bicarbonate and pyrolysis adsorption and oxidation adds water to prepare as spray liquid and flue gas, remove the oxidation state lead Pb in flue gas2+The particulate form Pb not being removed with previous steppAnd oligo-element state Pb0.The present invention compensates for Conventional processing methods and generally takes off the inefficient disadvantage of lead compared with the de- splicer's skill of existing tradition；And spray operation operational process, without fouling, blocking risk, insensitive to flue gas fluctuation, the adaptability of device is good；The problem of overcoming the secondary sewage and the pollution of secondary solid waste that wet process is denounced, has good economy and environmental benefit.

Description

A kind of process removing heavy metal in flue gas lead
Technical field
The present invention relates to atmosphere environmental protection flue gases purification field more particularly to a kind of works for removing heavy metal in flue gas lead Process.
Background technique
Lead is the poisonous substance that a kind of pair of environment and nerve have serious harm, and lead can hinder hemoglobin after entering in body blood Synthesis, leads to anaemia；Lead poisoning also results in arteries and veins vasopasm, digestive tract ulcer and retinal hemorrhage etc.；Lead can seriously endanger There are the symptoms such as inconvenient walking and insomnia in the growth and development of children.Source there are two lead contamination in atmosphere at present is main, one It is the natural mineral resources exploitation based on galena (PbS), the other is combustion of fossil fuel, industrial production, life and traffic side The discharge in face, wherein coal fire discharged is considered as most important the Factors Resulting in Lead Contamination.In recent years, with industry and the height of other industry Speed development, lead contamination is also increasingly severe, has become and seriously threatens one of important environmental factor of human health.
The lead content in world wide in fire coal is 0.1~7900 μ g/g at present, and the lead content in most of coals is 2~80 μg/g.There are mainly two types of forms for the existing forms of lead in flue gas: gaseous state lead Pbg(Pb0、Pb2+) and particle lead (Pbp), wherein by In Pb0With the property for being insoluble in water, existing flue gas purifying equipment is difficult to be removed, Pb2+Water solubility preferably, it is de- in desulfurization It can be partly removed in nitre equipment.
Method of removing lead common at present is roughly divided into de- lead before burning, takes off lead after taking off lead and burning in burning.Before burning De- lead is mainly by carrying out de- lead to coal-fired flotation and coal washing.It is a kind of based on organic matter and inorganic matter in coal dust that flotation, which takes off lead, Density and the different cleaning technique of organic affinity, since heavy metal element is primarily present in inorganic matter, by coal dust Middle addition organic suspending agent carries out flotation, can be enriched in flotation waste residue to realize a removing huge sum of money using the heavy metal in fire coal Belong to lead.It is that the lead that will be enriched on ash content of coal particle realizes de- lead by the ash content removed in coal that coal washing, which takes off lead,.Coal-washing technique at This is relatively low, can achieve the purpose that desulphurization denitration simultaneously.Flotation and coal washing belong to physics and take off lead, but all physics De- lead technology not can be completely removed the heavy metal in fire coal, and flotation effect also suffers from coal, pulverized coal particle size and flotation The influence of agent pH value, this technology are all subject to certain restrictions in promotion and application.
Lead is taken off in burning to refer in combustion by adding solid absorbent absorption capture heavy metal element, makes a huge sum of money The adsorbent for belonging to and having activated carries out physical absorption and chemical reaction, to realize the discharge of heavy metal in control fire coal.Burning Taking off lead afterwards is to carry out de- lead to the flue gas after burning.De- lead coal-fired at present takes off lead after mainly using burning.Lead is taken off after burning What domestic application was most at present is to take active carbon injection+cloth bag device to carry out de- lead, but this lead technology of removing is merely capable of removing 30% or so particle lead in flue gas, most of lead still enter atmosphere in the form of a vapor, form lead dust in an atmosphere and fall on Ground.Existing de- lead technology is higher and higher with the requirement of environmental improvement, is not able to satisfy the requirement of environmental improvement, is badly in need of exploitation More effective flue gas takes off lead technology.
Summary of the invention
It is an object of the invention to overcome existing flue gas to take off deficiency existing for lead technology, provide in the new removing flue gas of one kind The process of heavy metal lead solves gaseous state lead in flue gas and is difficult to be caught to realize the lead removed in flue gas under cryogenic Collect the problem of removing.
The process of removing heavy metal in flue gas lead provided by the invention, comprising the following steps:
(1) heavy metal lead, SO will be contained2The flue gas for being 90 DEG C~150 DEG C with NO temperature, which is passed through with sodium bicarbonate powder, is The bed of absorbent carries out pyrolysis adsorption oxidation reaction with the sodium bicarbonate as absorbent, and sodium bicarbonate is pyrolyzed as high ratio The sodium carbonate in surface area gap, sodium carbonate utilize the particulate form lead Pb in gap absorption flue gasp, the activity of oxidation reaction generation Oxidation material is by element state lead Pb0It is oxidized to oxidation state lead Pb2+；
(2) be sent into spray column from the lower part of spray column through step (1) treated flue gas, under the spray of top by carbonic acid The spray liquid that sodium bicarbonate powder behind hydrogen sodium powder end and pyrolysis adsorption and oxidation adds water to prepare comes into full contact with carry out elimination reaction, takes off Except the oxidation state lead Pb in flue gas2+The particulate form Pb not being removed with step (1)pAnd oligo-element state Pb0, lead is to precipitate or network Solvate form enters spray liquid and is removed；
(3) smoke exhaust system of the lead content lower than national emission standard after step (2) processing.
In above-mentioned technical proposal of the invention, SO in flue gas2Mass ratio with NO is preferably in the range of 1:1~10.
In above-mentioned technical proposal of the invention, in step (1) dosage of sodium bicarbonate can according to flue gas air speed 20000~ 30000h-1It is determined.
In above-mentioned technical proposal of the invention, sodium bicarbonate powder partial size priority acccess control is in 10-150 μ m.
In above-mentioned technical proposal of the invention, SO in sodium bicarbonate and flue gas2The active oxidation substance generated is reacted, Active principle includes at least one of sodium dithionate, sodium pyrosulfite, sodium thiosulfate, sodium bicarbonate and sodium carbonate.
In above-mentioned technical proposal of the invention, the volume ratio priority acccess control of spray liquid and flue gas is in 3~5:1 range.
In above-mentioned technical proposal of the invention, model of the mass concentration priority acccess control of the spray liquid 1%~10% It encloses.
Sodium bicarbonate and fresh bicarbonate after being pyrolyzed adsorption and oxidation in above-mentioned technical proposal of the invention, in spray liquid The quality of sodium is than priority acccess control in the range of 1:1~3.
In above-mentioned technical proposal of the invention, particulate form lead is gone preferably in through step (1) treated flue gas When being lower than 60% except efficiency, fresh sodium bicarbonate absorbent is replaced.
In above-mentioned technical proposal of the invention, preferably when spray liquid pH value is less than 8, sodium bicarbonate powder need to be added It is recycled to adjust pH to 8-10.
In above-mentioned technical proposal of the invention, the flue gas includes boiler fired coal flue gas, also includes that lead smelts generation The leaded exhaust gas that exhaust gas and other industry generate.
In above-mentioned technical proposal of the invention, using sodium bicarbonate powder as the bed of absorbent, one layer can be, it can also To say multilayer.The bed of absorbent can be set in the adsorption oxidation reaction device specially designed, also can be set in flue.
The trace heavy metal lead in flue gas is removed using the present invention, if continuous processing is taken to be removed, work Equipment in skill for being laid with sodium bicarbonate powder bed will at least be set side by side two, when the sodium bicarbonate in an equipment is inhaled When replacing fresh sodium bicarbonate powder after attached reduced performance, the other equipment starting equipped with sodium bicarbonate powder bed is needed Operation, guarantee are carried out continuously removing lead to flue gas.
The present invention utilizes carbon using the sodium bicarbonate with strong oxidation and strong suction-operated as gas cleaning adsorption bed Particulate form lead (Pb in the hole absorption flue gas for the high-specific surface area carbonic acid sodium that sour hydrogen sodium thermal decomposition generatesp), utilize bicarbonate SO in sodium and flue gas2React the element state lead (Pb in a large amount of activating oxide confrontation flue gases generated0) aoxidized, it is allowed to turn Turn to water-soluble preferably oxidation state lead (Pb2+), the flue gas after oxidative absorption enters spray column, after being pyrolyzed adsorption and oxidation Various shapes in flue gas are further removed under the good alkalinity removing environment that sodium bicarbonate and fresh sodium bicarbonate mixed solution are built The lead of state, to realize the purification to lead in flue gas.
The process of removing heavy metal in flue gas lead provided by the invention, is utilized during lead in removing flue gas The sulfur dioxide and nitrogen oxides of flue gas also enable the sulfur dioxide in flue gas remove, make cigarette while lead is removed NO in gas is first converted to NO through dry oxidation2, then NO is eventually converted into after spraying3 -(nitrate ion), further to take off Except the nitrogen oxides in flue gas provides advantage.Process i.e. of the invention can not only remove lead in flue gas, also for Sulfur dioxide and nitrogen oxides in removing flue gas create condition.The present invention is using oxidation sodium bicarbonate and sodium bicarbonate mixing Solution is as spray liquid, since the dissolubility of sodium salt is good, risk is blocked caused by no fouling, and insensitive to flue gas fluctuation, mentioned The high adaptability of device also overcomes secondary sewage that wet process is denounced and the problem of secondary solid waste pollutes.
The present invention has found a kind of good adsorbent-sodium bicarbonate of adsorption activity under cryogenic, is a kind of efficient oxygen Agent has effectively facilitated the Pb in coal-fired flue-gas0Transformation generates Pb2+And Pbp, solve gaseous state lead and be difficult to be trapped by traditional technology Problem provides a kind of removing new method for trace heavy metal lead in removing flue gas, and this method is simple, small investment, operation cost It is lower, it is corrosion-free to flue gas purifying equipment.
Specific embodiment
Below by taking the specific implementation of process of the invention in Luzhou, Sichuan factory as an example, to further illustrate this hair It is bright, but it should be strongly noted that therefore protection scope of the present invention cannot be limited among the embodiment confining spectrum.
Case study on implementation 1
The flue gas of Luzhou, Sichuan factory 130t/h coal-fired steam boiler discharge, tunnel gas amount are 158627m3/ h, cigarette Lead content is 33.42 μ g/Nm in gas3.The present embodiment aoxidizes space by ADSORPTION IN A FIXED BED of existing flue stack, with bicarbonate Sodium is 20000h according to flue gas air speed as adsorption and oxidation agent, dosage-1It is determined, to aoxidize sodium carbonate and unoxidized carbon Sour hydrogen sodium is the spray liquid of spray column, reacts the lead removed in flue gas with smoke contacts by spray liquid.Specific removing operation is such as Under:
(1) ADSORPTION IN A FIXED BED aoxidizes: commercially available sodium bicarbonate is polished, sieve the sodium base that resulting partial size is 150 μm Absorbent powder is placed in the fixed bed in flue, and fixed bed is set as one layer, and 90 DEG C of flue-gas temperature, SO in flue gas2 Ratio with NO is 1.0.When fixed bed containing lead fume by being loaded with sodium base absorbant, sodium base absorbant can occur thermal decomposition and produce The hole of raw high-specific surface area, adsorbs the particulate form lead (Pb in flue gasp)；The SO in sodium bicarbonate and flue gas after pyrolysis2Reaction produces Raw a large amount of active oxidation substance, by element state lead (Pb in flue gas0) it is oxidized to oxidation state lead (Pb2+), flue gas after adsorption and oxidation Detection sample detection lead tolerance is 13.60 μ g/Nm3。
(2) spray column spray removing: by the flue gas in step (1) after ADSORPTION IN A FIXED BED oxidation processes under spray column Portion is sent into spray column, and spray liquid is the sodium bicarbonate and unoxidized sodium hydrogen carbonate powder after aoxidizing in above-mentioned fixed bed in spray column End mixes in mass ratio for 3:1, and Hou Jiashui is configured to the sodium bicarbonate solution that mass concentration is 10.0%, and spray liquid passes through circulation Pump circulation is sprayed from top, is come into full contact with carry out elimination reaction with flue gas, is removed the oxidation state lead Pb in flue gas2+And step (1) the particulate form Pb not being removedpAnd oligo-element state Pb0, lead is to precipitate or complex form enters spray liquid and is removed, spray Drenching liquid-gas ratio in tower is 5.0, and entire wet sprinkling system running pH is 8.84, and flue gas inspection sample detection contains after spray removing Lead amount is 3.79 μ g/Nm3。
(3) smoke exhaust system of the lead content lower than national emission standard after step (2) processing.
Case study on implementation 2
The flue gas of Luzhou, Sichuan factory 130t/h coal-fired steam boiler discharge, tunnel gas amount are 138167m3/ h, cigarette Lead content is 37.56 μ g/Nm in gas3.The present embodiment aoxidizes space by ADSORPTION IN A FIXED BED of existing flue stack, with bicarbonate Sodium is 24500h according to flue gas air speed as adsorption and oxidation agent, dosage-1It is determined, to aoxidize sodium bicarbonate and unoxidized Sodium bicarbonate is the spray liquid of spray column, reacts the lead removed in flue gas with smoke contacts by spray liquid.Specific removing operation It is as follows:
(1) ADSORPTION IN A FIXED BED aoxidizes: commercially available sodium bicarbonate is polished, it sieves the sodium base that resulting partial size is 50 μm and inhales Agent powder to be received to be placed in the fixed bed in flue, fixed bed is set as one layer, and 108 DEG C of flue-gas temperature, SO in flue gas2With The ratio of NO is 1.2.Flue gas inspection sample detection lead tolerance is 10.80 μ g/Nm after adsorption and oxidation3。
(2) spray column spray removing: by the flue gas in step (1) after ADSORPTION IN A FIXED BED oxidation processes under spray column Portion is sent into spray column, and spray liquid is that sodium bicarbonate and above-mentioned sodium bicarbonate powder after aoxidizing in above-mentioned fixed bed are pressed in spray column Mass ratio is 1:1 mixing, and Hou Jiashui is configured to the sodium bicarbonate solution that mass concentration is 2.5%, and spray liquid is followed by circulating pump Ring comes into full contact with carry out elimination reaction with flue gas from top spray, and liquid-gas ratio is 4.0 in spray column, entire wet sprinkling system fortune Row pH is 8.42, and flue gas inspection sample detection lead tolerance is 5.84 μ g/Nm after spray removing3。
(3) smoke exhaust system of the lead content lower than national emission standard after step (2) processing.
Case study on implementation 3
The flue gas of Luzhou, Sichuan factory 130t/h coal-fired steam boiler discharge, tunnel gas amount are 153449m3/ h, cigarette Lead content is 38.30 μ g/Nm in gas3.The present embodiment aoxidizes space by ADSORPTION IN A FIXED BED of existing flue stack, with bicarbonate Sodium is 30000h according to flue gas air speed as adsorption and oxidation agent, dosage-1It is determined, to aoxidize sodium bicarbonate and unoxidized Sodium bicarbonate is the spray liquid of spray column, reacts the lead removed in flue gas with smoke contacts by spray liquid.Specific removing operation It is as follows:
(1) ADSORPTION IN A FIXED BED aoxidizes: commercially available sodium bicarbonate is polished, it sieves the sodium base that resulting partial size is 10 μm and inhales Agent powder to be received to be placed in the fixed bed in flue, fixed bed is set as one layer, and 108 DEG C of flue-gas temperature, SO in flue gas2With The ratio of NO is 10.0.Flue gas inspection sample detection lead tolerance is 10.30 μ g/Nm after adsorption and oxidation3。
(2) spray column spray removing: by the flue gas in step (1) after ADSORPTION IN A FIXED BED oxidation processes under spray column Portion is sent into spray column, and spray liquid is that sodium bicarbonate and above-mentioned sodium bicarbonate powder after aoxidizing in above-mentioned fixed bed are pressed in spray column Mass ratio is 2:1 mixing, and Hou Jiashui is configured to the sodium bicarbonate solution that mass concentration is 1.0%, and spray liquid is followed by circulating pump Ring comes into full contact with carry out elimination reaction with flue gas from top spray, and liquid-gas ratio is 3.0 entire wet sprinkling system fortune in spray column Row pH is 8.13, and flue gas inspection sample detection lead tolerance is 8.74 μ g/Nm after spray removing3。
(3) smoke exhaust system of the lead content lower than national emission standard after step (2) processing.
It should be noted that in above three embodiments, when particulate form lead goes out to imitate in step (1) treated flue gas When rate is lower than 60%, when needing replacing the pH value of spray liquid in new sodium bicarbonate absorbent step (2) less than 8, need to be added Sodium bicarbonate powder adjusts pH value to 8~10.
In each embodiment, the dosage of sodium base absorbant powder or solution, according to flue gas pollutant changes of contents (visitor Flue gas pollutant changes with raw materials and fuel in sight and operating condition changes and changes) and on-line checking pollutant emission requirement up to standard, The dosage of adjustment sodium base absorbant is so that discharge flue gas reaches emission request in real time.
Although describing a specific embodiment of the invention in conjunction with the embodiments above, those skilled in the art should Understand, these are merely examples, without departing from the principle and essence of the present invention, can do to these embodiments Various changes or modifications out, such as the adsorption and oxidation fixed bed of setting lead, it is multilayer that fixed bed, which can be set, or more A fixed bed is set side by side along the horizontal direction that flue gas enters, but these change and modification each fall within protection scope of the present invention.

Claims (10)

1. a kind of process for removing heavy metal in flue gas lead, which comprises the following steps:
(1) heavy metal lead, SO will be contained2The flue gas for being 90 DEG C~150 DEG C with NO temperature is passed through using sodium bicarbonate powder as absorbent Bed, carry out pyrolysis adsorption oxidation reaction with the sodium bicarbonate as absorbent, sodium bicarbonate is pyrolyzed as high-specific surface area The sodium carbonate in gap, sodium carbonate adsorb the particulate form lead Pb in flue gas by gapp, the activating oxide of oxidation reaction generation Matter is by element state lead Pb0It is oxidized to oxidation state lead Pb2+；
(2) be sent into spray column from the lower part of spray column through step (1) treated flue gas, under the spray of top by sodium bicarbonate The spray liquid that sodium bicarbonate powder after powder and pyrolysis adsorption and oxidation adds water to prepare comes into full contact with carry out elimination reaction, removes cigarette Oxidation state lead Pb in gas2+The particulate form Pb not being removed with step (1)pAnd oligo-element state Pb0, lead is to precipitate or complex compound Form enters spray liquid and is removed；
(3) smoke exhaust system of the lead content lower than national emission standard after step (2) processing.
2. the process of removing heavy metal in flue gas lead according to claim 1, which is characterized in that SO in flue gas2And NO Mass ratio be 1:1~10.
3. the process of removing heavy metal in flue gas lead according to claim 1, which is characterized in that carbon in step (1) The dosage of sour hydrogen sodium is according to 20000~30000h of flue gas air speed-1It is determined.
4. the process of removing heavy metal in flue gas lead according to claim 1, which is characterized in that sodium bicarbonate powder Particle size range is at 10-150 μm.
5. the process of removing heavy metal in flue gas lead according to claim 1, which is characterized in that sodium bicarbonate and cigarette SO in gas2The active oxidation substance generated is reacted, active principle includes at least sodium dithionate, sodium pyrosulfite, thio sulphur One of sour sodium, sodium bicarbonate and sodium carbonate.
6. the process of removing heavy metal in flue gas lead according to one of claims 1 to 5, which is characterized in that spray The volume ratio of liquid and flue gas is 3~5:1.
7. the process of removing heavy metal in flue gas lead according to claim 6, which is characterized in that the spray liquid Mass concentration is 1%~10%.
8. the process of removing heavy metal in flue gas lead according to claim 7, which is characterized in that be pyrolyzed in spray liquid The mass ratio of sodium bicarbonate and sodium bicarbonate after adsorption and oxidation is 1:1~3.
9. the process of removing heavy metal in flue gas lead according to one of claims 1 to 5, which is characterized in that through step Suddenly when the removal efficiency of particulate form lead is lower than 60% in (1) treated flue gas, fresh sodium bicarbonate absorbent is replaced.
10. the process of removing heavy metal in flue gas lead according to one of claims 1 to 5, which is characterized in that spray When liquid pH value is less than 8, it is recycled that sodium bicarbonate powder adjusting pH to 8-10 need to be added.
CN201910269652.8A 2018-12-21 2019-04-04 A kind of process removing heavy metal in flue gas lead Pending CN109908719A (en)

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CN2018115685777 2018-12-21
CN201811568577.7A CN109569224A (en) 2018-12-21 2018-12-21 A kind of process removing heavy metal in flue gas lead

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CN201811568577.7A Pending CN109569224A (en) 2018-12-21 2018-12-21 A kind of process removing heavy metal in flue gas lead
CN201910269783.6A Pending CN109908720A (en) 2018-12-21 2019-04-04 A kind of method that sodium salt method removes heavy metal Hg in low-temperature flue gas
CN201910269810.XA Pending CN109908721A (en) 2018-12-21 2019-04-04 A kind of method that sodium salt method removes heavy metal arsenic in low-temperature flue gas
CN201910269826.0A Pending CN109908722A (en) 2018-12-21 2019-04-04 A kind of method that sodium salt method removes metalloid selenium in low-temperature flue gas
CN201910269652.8A Pending CN109908719A (en) 2018-12-21 2019-04-04 A kind of process removing heavy metal in flue gas lead

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CN201811568577.7A Pending CN109569224A (en) 2018-12-21 2018-12-21 A kind of process removing heavy metal in flue gas lead
CN201910269783.6A Pending CN109908720A (en) 2018-12-21 2019-04-04 A kind of method that sodium salt method removes heavy metal Hg in low-temperature flue gas
CN201910269810.XA Pending CN109908721A (en) 2018-12-21 2019-04-04 A kind of method that sodium salt method removes heavy metal arsenic in low-temperature flue gas
CN201910269826.0A Pending CN109908722A (en) 2018-12-21 2019-04-04 A kind of method that sodium salt method removes metalloid selenium in low-temperature flue gas

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