CN111603921A - Flue gas denitration system and denitration method for tin smelting furnace - Google Patents
Flue gas denitration system and denitration method for tin smelting furnace Download PDFInfo
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- CN111603921A CN111603921A CN202010548939.7A CN202010548939A CN111603921A CN 111603921 A CN111603921 A CN 111603921A CN 202010548939 A CN202010548939 A CN 202010548939A CN 111603921 A CN111603921 A CN 111603921A
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- ammonia
- compressed air
- smelting furnace
- tin smelting
- flue
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- 238000003723 Smelting Methods 0.000 title claims abstract description 86
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 title claims abstract description 86
- 239000003546 flue gas Substances 0.000 title claims abstract description 52
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 11
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 246
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 118
- 239000007788 liquid Substances 0.000 claims abstract description 104
- 235000011114 ammonium hydroxide Nutrition 0.000 claims abstract description 74
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000007921 spray Substances 0.000 claims abstract description 40
- 238000009826 distribution Methods 0.000 claims abstract description 31
- 238000003860 storage Methods 0.000 claims abstract description 17
- 238000012806 monitoring device Methods 0.000 claims description 26
- 230000001105 regulatory effect Effects 0.000 claims description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 2
- 238000009692 water atomization Methods 0.000 claims description 2
- 239000000779 smoke Substances 0.000 abstract description 6
- 239000000428 dust Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000012141 concentrate Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonium chloride Substances [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009688 liquid atomisation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
Images
Classifications
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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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
-
- 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
- B01D53/346—Controlling the process
-
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Abstract
The utility model provides a tin smelting furnace flue gas denitration system and denitration method, denitration system includes ammonia water and joins in marriage concentrated device (1), ammonia liquor storage device (3), carries ammonia liquor transportation distribution pipeline (12) that branch road (13) stretched into in tin smelting furnace flue (10) through a plurality of ammonia liquors, stretches into compressed air distribution pipeline (11) in tin smelting furnace flue (10) through a plurality of compressed air branch roads (14), connects atomizing spray gun (7) that branch road and compressed air branch road were carried to the ammonia liquor. The invention can finish NO in tin smelting smoke in a reaction area reasonably arranged in a tin smelting furnace flueXFully reacts with atomized ammonia liquid, efficiently denitrates, and reduces escape of ammonia.
Description
Technical Field
The invention relates to the technical field of treatment of tin smelting flue gas, in particular to a device and a method for carrying out denitration treatment on tin smelting flue gas.
Background
The flue gas generated in the production process of the tin smelting furnace (fuming furnace and top-blown furnace) contains a large amount of smoke dust and various harmful gases, and the flue gas has high temperature, high corrosivity, complex components and NOXUnstable concentration of NO in the process of flue gas treatmentXThe treatment is not practical and effective, and the harmful gas in the flue gas is not effectively treated. With the enactment of new environmental protection laws, regulations and standards, such as environmental protection law, air pollution prevention law, matching management method, emission standard of industrial pollutants of tin, antimony and mercury (GB30770-2014), and the like, smoke dust, SO2The allowable emission standard of pollutants such as NOx is lower and lower, and higher requirements are put on the pollution treatment technology and the environmental management level of enterprises, wherein the emission standard of NOx is 300mg/m3Reduced to 200mg/m3. Therefore, it is necessary to develop a treatment device and a treatment method for NOx in tin smelting flue gas to strictly control NOx emission.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a denitration system and a denitration method for tin smelting flue gas, which have the advantages of low investment, simplicity, high efficiency, easy process control and good denitration effect.
The purpose of the invention is realized by the following technical scheme:
a flue gas denitration system of a tin smelting furnace comprises an ammonia water concentration distribution device, an ammonia liquid storage device connected with the ammonia water concentration distribution device through a pipeline, an ammonia liquid conveying and distributing pipeline with one end connected with the ammonia liquid storage device and the other end extending into a flue of the tin smelting furnace through a plurality of ammonia liquid conveying branches, a compressed air distributing pipeline extending into the flue of the tin smelting furnace through a plurality of compressed air branches, and an atomizing spray gun connected with the ammonia liquid conveying branches and the compressed air branches; a first conveying pump is arranged on a pipeline connecting the ammonia water concentration distribution device and the ammonia liquid storage device, and a second conveying pump is arranged on the ammonia liquid conveying and distribution pipeline; the ammonia liquid conveying and distributing pipelines are arranged along the two sides and the top surface of the tin smelting furnace flue, and the ammonia liquid conveying and distributing pipelines are connected with ammonia liquid conveying branches which extend into the flue from the two sides and the top surface of the tin smelting furnace flue respectively; the compressed air distribution pipeline is also arranged along the two sides and the top surface of the tin smelting furnace flue, and compressed air branches extending into the flue from the two sides and the top surface of the tin smelting furnace flue are connected to the compressed air distribution pipeline; an ammonia liquid conveying branch is matched with a compressed air branch and is connected with an atomizing spray gun together, and atomized ammonia liquid is sprayed into a flue to carry out flue gas denitration; the ammonia liquid conveying and distributing pipeline is provided with an ammonia liquid control valve, and the compressed air distributing pipeline is provided with a compressed air control valve; an ammonia water regulating valve, an ammonia water flowmeter and an ammonia water pressure gauge are arranged on each ammonia liquid conveying branch, and a compressed air regulating valve, a compressed air flowmeter and a compressed air pressure gauge are arranged on each compressed air branch; a flue gas online monitoring device and an ammonia online monitoring device are arranged in a flue of the tin smelting furnace; the ammonia liquid control valve, the compressed air control valve, the ammonia water regulating valve, the compressed air regulating valve, the ammonia water flowmeter, the compressed air flowmeter, the ammonia water pressure gauge, the compressed air pressure gauge, the flue gas online monitoring device and the ammonia gas online monitoring device are all connected with the automatic control system of the tin smelting furnace.
Further, the branch road is carried to the ammonia liquid and the compressed air branch road is provided with 8 respectively, constitutes 8 and carries the combination of branch road and compressed air branch road to the ammonia liquid, connects 8 atomizing spray guns respectively, and the front end interval sets up 2 atomizing spray guns in the tin smelting stove flue, and the top interval sets up 2 atomizing spray guns, and the rear end interval sets up 4 atomizing spray guns.
The denitration method of the flue gas denitration system of the tin smelting furnace comprises the following steps: adding desalted water and ammonia water into an ammonia water concentration device to prepare an ammonia water solution with required concentration, pumping the ammonia water solution to an ammonia liquid storage device through a first delivery pump for storage), and then delivering and distributing the ammonia liquid to an ammonia liquid delivery branch through an ammonia liquid delivery and distribution pipeline by using a second delivery pump; meanwhile, the compressed air sent from the compressed air distribution pipeline is distributed to the compressed air branch; the ammonia liquid in the ammonia liquid conveying branch and the compressed air in the compressed air branch enter an atomizing spray gun to be mixed at the same time, and the ammonia liquid spray is formed and sprayed into a flue of the tin smelting furnace;
the on-line monitoring device of the flue gas and the on-line monitoring device of the ammonia gas transmit the monitored flue gas information and ammonia escape information to the automatic control system of the tin smelting furnace, the automatic control system of the tin smelting furnace controls the flow of ammonia water needed by the tin smelting furnace through an ammonia liquid control valve arranged on an ammonia liquid conveying and distributing pipeline, adjusts and controls the flow of the ammonia water of a single atomizing spray gun through an ammonia water flow meter, an ammonia water pressure gauge and an ammonia water adjusting valve on each ammonia liquid conveying branch, adjusts and controls the compressed air quantity needed by the ammonia liquid atomized by the single atomizing spray gun through a compressed air control valve, a compressed air flow meter, a compressed air pressure gauge and a compressed air adjusting valve on each compressed air branch, the atomizing spray gun sprays the atomized ammonia liquid into a high-temperature area of the flue of the tin smelting furnace, the atomized ammonia liquid is vertically contacted with the flue gas on the cross section of the flue gas of the tin smelting, NOx is removed, and the sprayed atomized ammonia liquid amount and NO generated in the smoke of the tin smelting furnace are adjusted and controlled by an automatic control system of the tin smelting furnaceXThe reaction is thorough, and excessive ammonia liquid can not be sprayed out.
According to the invention, through reasonable arrangement along the flue of the tin smelting furnace and the ammonia liquid spraying system, the ammonia liquid is vertically contacted with the flue gas on the cross section of the flue of the tin smelting furnace, NOx in the flue gas is captured at the moment of ammonia liquid atomization and rapidly reacts with the flue gas, and the aim of removing NOx is achieved rapidly and efficiently.
Compared with the prior art, the invention has the main advantages that:
1. based on the characteristics of large smoke and dust amount, high flowing speed, high temperature, easy volatilization of ammonia water, low cost, good safety and the like of the tin smelting furnace, ammonia liquor is adopted as a reducing agent, and an atomization spraying method is adopted, so that the smoke and the reducing agent are fully reacted, and the denitration efficiency is improved;
2. according to the temperature zone change characteristics of the tin smelting furnace flue gas in the flue, a reaction zone of ammonia liquid and the flue gas is reasonably arranged, so that the denitration is more thorough;
3. according to NO in the flue gas of the tin smelting furnaceXDifferent working conditions such as unstable concentration and the like are monitored through the online monitoring device of the tin smelting flue gas and the online monitoring device of ammonia escapeConnecting, and controlling the ammonia liquid injection amount through bidirectional adjustment of an automatic control system of the tin smelting furnace to ensure that the atomized ammonia liquid amount injected by an atomizing spray gun and NO generated in the flue gas of the tin smelting furnaceXThe reaction is thorough, the escape rate of ammonia is low, and excessive ammonia liquor can not be sprayed out, so that the operation and the heat efficiency of the tin smelting furnace are influenced.
4. The system of the invention has low investment, easy installation and control and strong practicability.
Drawings
FIG. 1 is a schematic view of a denitration system of the present invention.
In the figure: 1-ammonia water concentration distribution device, 2-first delivery pump, 3-ammonia water storage device, 4-second delivery pump, 5-compressed air regulating valve, 6-ammonia water regulating valve, 7-atomization spray gun, 8-ammonia water control valve, 9-compressed air control valve, 10-tin smelting furnace flue, 11-compressed air distribution pipeline, 12-ammonia liquid delivery distribution pipeline, 13-ammonia liquid delivery branch, 14-compressed air branch, 15-flue gas online monitoring device, 16-ammonia gas online monitoring device, 17-ammonia liquid flow meter, 18-compressed air flow meter, 19-ammonia water pressure meter, 20-compressed air pressure meter, 21-ammonia water pipe and 22-desalted water pipe.
Detailed Description
The invention is further explained by the accompanying drawings.
As shown in figure 1, a tin smelting furnace flue gas denitration system, join in marriage concentrated device 1 including the aqueous ammonia, join in marriage ammonia liquid storage device 3 that concentrated device is connected through pipeline and aqueous ammonia, ammonia liquid storage device is connected to one end, the other end carries the ammonia liquid that branch road 13 stretches into in tin smelting furnace flue 10 through a plurality of ammonia liquids and carries distribution pipeline 12, stretch into compressed air distribution pipeline 11 in tin smelting furnace flue 10 through a plurality of compressed air branch roads 14, connect the atomizing spray gun 7 of ammonia liquid transport branch road and compressed air branch road. A first delivery pump 2 is arranged on a pipeline connecting the ammonia water concentration distribution device and the ammonia liquid storage device, and a second delivery pump 4 is arranged on the ammonia liquid delivery distribution pipeline. The ammonia liquid conveying and distributing pipeline 12 is arranged along the two sides and the top surface of the tin smelting furnace flue 10, and ammonia liquid conveying branch pipelines 13 which respectively extend into the flue from the two sides and the top surface of the tin smelting furnace flue are connected on the ammonia liquid conveying and distributing pipeline. The compressed air distribution pipeline 11 is also arranged along the two sides and the top surface of the tin smelting furnace flue, and a compressed air branch 14 extending into the flue from the two sides and the top surface of the tin smelting furnace flue is connected to the compressed air distribution pipeline; an ammonia liquor conveying branch 13 is paired with a compressed air branch 14 and is connected with an atomizing spray gun 7 together, and atomized ammonia liquor is sprayed into a flue to carry out flue gas denitration. The atomizing spray gun 7 is horizontally arranged in the flue, so that the atomized ammonia liquid is sprayed along the cross section of the flue. A horizontally disposed atomizing lance is seen in cross-section in fig. 1. An ammonia liquid control valve 8 is provided in the ammonia liquid delivery and distribution line 12, and a compressed air control valve 9 is provided in the compressed air distribution line 11. An ammonia water regulating valve 6, an ammonia water flowmeter 17 and an ammonia water pressure gauge 19 are arranged on each ammonia liquid conveying branch, and a compressed air regulating valve 5, a compressed air flowmeter 18 and a compressed air pressure gauge 20 are arranged on each compressed air branch. The rear end in the flue 10 of the tin smelting furnace is provided with an on-line flue gas monitoring device 15 and an on-line ammonia gas monitoring device 16. And the ammonia liquid control valve 8, the compressed air control valve 9, the ammonia water regulating valve 6, the compressed air control valve 5, the ammonia water flowmeter 17, the compressed air flowmeter 18, the ammonia water pressure gauge 19, the compressed air pressure gauge 20, the flue gas online monitoring device 15 and the ammonia gas online monitoring device 16 are all connected with the automatic control system of the tin smelting furnace.
In this embodiment, the branch road 13 is carried to the ammonia liquid and the compressed air branch road 14 is provided with 8 respectively, constitutes 8 and carries the combination of branch road and compressed air branch road to the ammonia liquid, connects 8 atomizing spray guns 7 respectively, and the front end interval sets up 2 atomizing spray guns in tin smelting furnace flue 10, and the top interval sets up 2 atomizing spray guns, and the rear end interval sets up 4 atomizing spray guns.
The denitration method of the flue gas denitration system of the tin smelting furnace comprises the following steps: the ammonia water concentrate is fed into the ammonia water concentration device 1 through the ammonia water pipe 21, the self-produced desalted water is fed into the ammonia water concentration device through the desalted water pipe 22, and the ammonia water concentrate and the desalted water are mixed in the ammonia water concentration device 1 to prepare the ammonia water solution (ammonia solution) with the required concentration. The prepared ammonia liquid is sent to an ammonia liquid storage device 3 by a first delivery pump 2 for storage and standby. When the ammonia liquid is required to be used, the ammonia liquid is conveyed and distributed to the ammonia liquid conveying branch 13 through the ammonia liquid conveying and distributing pipeline 12 by using the second conveying pump 4; meanwhile, compressed air from the plant area air compression station is distributed to a compressed air branch 14 through a compressed air distribution pipeline 11; the ammonia liquid in the ammonia liquid conveying branch and the compressed air in the compressed air branch enter the atomizing spray gun 7 to be mixed at the same time, and ammonia liquid spray is formed and sprayed into the flue 10 of the tin smelting furnace. The atomizing spray gun 7 is available on the market directly.
The on-line monitoring device 15 of the flue gas transmits the monitored information of the flue gas to the automatic control system of the tin smelting furnace, the on-line monitoring device 16 of the ammonia gas simultaneously transmits the detected ammonia escape information to the automatic control system of the tin smelting furnace, the automatic control system of the tin smelting furnace controls the flow of ammonia water needed by the tin smelting furnace through an ammonia liquid control valve 8 arranged on an ammonia liquid conveying and distributing pipeline 12, the flow of the ammonia water of a single atomizing spray gun is adjusted and controlled through an ammonia water flow meter 17, an ammonia water pressure gauge 19 and an ammonia water adjusting valve 6 on each ammonia liquid conveying branch, the compressed air control valve 9, a compressed air flow meter 18, a compressed air pressure gauge 20 and a compressed air adjusting valve 5 on each compressed air branch are used for adjusting the amount of compressed air needed by the single atomizing spray gun for atomizing the ammonia liquid, the atomizing spray gun sprays the atomized ammonia liquid into a high temperature area of the flue of the tin smelting furnace to be, capturing NOx in the flue gas at the moment of ammonia water atomization, reacting to remove NOx, and adjusting and controlling the sprayed atomized ammonia liquid amount and NO generated in the flue gas of the tin smelting furnace through an automatic control system of the tin smelting furnaceXThe reaction is thorough, and excessive ammonia liquid can not be sprayed out.
The control devices in the denitration system of the invention, such as the ammonia liquid control valve 8, the compressed air control valve 9, the ammonia water regulating valve 6, the compressed air regulating valve 5, the ammonia water flowmeter 17, the compressed air flowmeter 18, the ammonia water pressure gauge 19, the compressed air pressure gauge 20 and the like are directly connected to the automatic control system of the tin smelting furnace, no additional control system is needed, and the double connection of the denitration system of the invention with the tin smelting flue gas on-line monitoring device and the ammonia gas on-line monitoring device is realized by virtue of the flue gas on-line monitoring device 15 and the ammonia gas on-line monitoring device 16 which are provided and controlled by the tin smelting furnace control system, thereby realizing the double connection of the denitration system ofThe two-way regulation and control are realized, so that the amount of the ammonia liquid sprayed into the flue can be equal to the NO generated in the flue gas of the tin smelting furnaceXComplete reaction, and no influence on the operation and thermal efficiency of the tin smelting furnace due to excessive sprayed ammonia liquid. The control system of the tin smelting furnace and the access of the control device in the denitration system are all technical means which are well known by the ordinary technical personnel in the field.
Claims (3)
1. A flue gas denitration system of a tin smelting furnace is characterized by comprising an ammonia water concentration distribution device (1), an ammonia liquid storage device (3) connected with the ammonia water concentration distribution device through a pipeline, an ammonia liquid conveying and distributing pipeline (12) with one end connected with the ammonia liquid storage device and the other end extending into a tin smelting furnace flue (10) through a plurality of ammonia liquid conveying branches (13), a compressed air distributing pipeline (11) extending into the tin smelting furnace flue (10) through a plurality of compressed air branches (14), and an atomizing spray gun (7) connected with the ammonia liquid conveying branches and the compressed air branches; a first delivery pump (2) is arranged on a pipeline connecting the ammonia water concentration distribution device and the ammonia liquid storage device, and a second delivery pump (4) is arranged on the ammonia liquid delivery distribution pipeline; the ammonia liquid conveying and distributing pipeline (12) is arranged along the two sides and the top surface of the tin smelting furnace flue (10), and ammonia liquid conveying branch circuits (13) extending into the flue from the two sides and the top surface of the tin smelting furnace flue are connected to the ammonia liquid conveying and distributing pipeline; the compressed air distribution pipeline (11) is also arranged along the two sides and the top surface of the tin smelting furnace flue, and compressed air branches (14) which respectively extend into the flue from the two sides and the top surface of the tin smelting furnace flue are connected to the compressed air distribution pipeline; an ammonia liquid conveying branch (13) is matched with a compressed air branch (14) and is connected with an atomizing spray gun (7) together, and atomized ammonia liquid is sprayed into a flue to carry out flue gas denitration; an ammonia liquid control valve (8) is arranged on the ammonia liquid conveying and distributing pipeline (12), and a compressed air control valve (9) is arranged on the compressed air distributing pipeline (11); an ammonia water regulating valve (6), an ammonia water flowmeter (17) and an ammonia water pressure gauge (19) are arranged on each ammonia liquid conveying branch, and a compressed air regulating valve (5), a compressed air flowmeter (18) and a compressed air pressure gauge (20) are arranged on each compressed air branch; a flue gas online monitoring device (15) and an ammonia gas online monitoring device (16) are arranged in the tin smelting furnace flue (10); the ammonia control valve (8), the compressed air control valve (9), the ammonia regulating valve (6), the compressed air regulating valve (5), the ammonia flowmeter (17), the compressed air flowmeter (18), the ammonia pressure gauge (19), the compressed air pressure gauge (20), the flue gas online monitoring device (15) and the ammonia gas online monitoring device (16) are all connected with an automatic control system of the tin smelting furnace.
2. The flue gas denitration system of a tin smelting furnace according to claim 1, characterized in that, the ammonia liquor delivery branch (13) and the compressed air branch (14) are respectively provided with 8, constitute 8 to the combination of ammonia liquor delivery branch and compressed air branch, connect 8 atomizing spray guns (7) respectively, the front end interval sets up 2 atomizing spray guns in tin smelting furnace flue (10), the top interval sets up 2 atomizing spray guns, the rear end interval sets up 4 atomizing spray guns.
3. The denitration method of a flue gas denitration system of a tin smelting furnace according to claim 1 or 2, characterized in that the method is as follows: adding desalted water and ammonia water into an ammonia water concentration device (1) to prepare an ammonia water solution with required concentration, sending the ammonia water solution to an ammonia liquid storage device (3) through a first delivery pump (2) for storage, and then delivering and distributing the ammonia liquid to an ammonia liquid delivery branch (13) through an ammonia liquid delivery and distribution pipeline (12) by using a second delivery pump (4); while the compressed air fed from the compressed air distribution line (11) is distributed to the compressed air branch (14); the ammonia liquid in the ammonia liquid conveying branch and the compressed air in the compressed air branch enter an atomizing spray gun (7) to be mixed at the same time, and the ammonia liquid spray is formed and sprayed into a flue (10) of the tin smelting furnace;
flue gas on-line monitoring device (15) and ammonia on-line monitoring device (16) convey the flue gas information and ammonia escape information who monitor to tin smelting furnace automatic control system, tin smelting furnace automatic control system is through setting up ammonia control valve (8) control tin smelting furnace on ammonia liquor transport distribution pipeline (11) and need the flow of aqueous ammonia, through every ammonia liquor delivery branch on the branch road aqueous ammonia flowmeter (17), aqueous ammonia manometer (19) and aqueous ammonia governing valve (6) regulation control single branch atomizing spray gun's aqueous ammonia flow, through compressed air control valve (9), everyCompressed air flow meter (18), compressed air pressure gauge (20) and compressed air regulating valve (5) on the compressed air branch are used for regulating the amount of compressed air required by the atomized ammonia liquid of a single atomizing spray gun, the atomized ammonia liquid is sprayed into the high-temperature area of the tin smelting furnace flue by the atomizing spray gun and is vertically contacted with the flue gas on the cross section of the tin smelting furnace flue, NOx in the flue gas is captured and reacted at the moment of ammonia water atomization, NOx is removed, and the amount of the atomized ammonia liquid sprayed out and NO generated in the flue gas of the tin smelting furnace are regulated and controlled by the automatic control system of the tin smelting furnaceXThe reaction is thorough, and excessive ammonia liquid can not be sprayed out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010548939.7A CN111603921A (en) | 2020-06-16 | 2020-06-16 | Flue gas denitration system and denitration method for tin smelting furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010548939.7A CN111603921A (en) | 2020-06-16 | 2020-06-16 | Flue gas denitration system and denitration method for tin smelting furnace |
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| CN111603921A true CN111603921A (en) | 2020-09-01 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190252A (en) * | 2014-08-20 | 2014-12-10 | 浙江大学 | Multistage pyrolysis coupled flue gas denitrification system with independent SCR (Selective Catalytic Reduction) ammonia-supplementing spray guns |
| CN107854980A (en) * | 2017-12-13 | 2018-03-30 | 云南驰宏锌锗股份有限公司 | A kind of system for removing lead-zinc smelting flue gas nitrogen oxide |
| CN212440745U (en) * | 2020-06-16 | 2021-02-02 | 云南锡业股份有限公司锡业分公司 | Flue gas denitration system of tin smelting furnace |
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2020
- 2020-06-16 CN CN202010548939.7A patent/CN111603921A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104190252A (en) * | 2014-08-20 | 2014-12-10 | 浙江大学 | Multistage pyrolysis coupled flue gas denitrification system with independent SCR (Selective Catalytic Reduction) ammonia-supplementing spray guns |
| CN107854980A (en) * | 2017-12-13 | 2018-03-30 | 云南驰宏锌锗股份有限公司 | A kind of system for removing lead-zinc smelting flue gas nitrogen oxide |
| CN212440745U (en) * | 2020-06-16 | 2021-02-02 | 云南锡业股份有限公司锡业分公司 | Flue gas denitration system of tin smelting furnace |
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