CN210801594U - SCR denitration flue gas heating device with annular seam sealing device - Google Patents
SCR denitration flue gas heating device with annular seam sealing device Download PDFInfo
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- CN210801594U CN210801594U CN201921342647.7U CN201921342647U CN210801594U CN 210801594 U CN210801594 U CN 210801594U CN 201921342647 U CN201921342647 U CN 201921342647U CN 210801594 U CN210801594 U CN 210801594U
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- 238000007789 sealing Methods 0.000 title claims abstract description 100
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 84
- 239000003546 flue gas Substances 0.000 title claims abstract description 84
- 238000010438 heat treatment Methods 0.000 title claims abstract description 16
- 239000007789 gas Substances 0.000 claims abstract description 67
- 239000000779 smoke Substances 0.000 claims abstract description 35
- 238000002485 combustion reaction Methods 0.000 claims abstract description 13
- 230000001133 acceleration Effects 0.000 abstract 1
- 230000002349 favourable effect Effects 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 13
- 238000005245 sintering Methods 0.000 description 11
- 238000005453 pelletization Methods 0.000 description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 238000000034 method Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000008602 contraction Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000008188 pellet Substances 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Abstract
An SCR denitration flue gas heating device with a circular seam sealing device belongs to the technical field of denitration heating. The device comprises a hot blast stove combustion system and a stove pressure control system; the combustion system of the hot blast stove comprises a combustion-supporting fan, a combustion-supporting gas pipeline, a combustible gas pipeline, a combustor and the like; the combustion-supporting fan is connected with the burner through a combustion-supporting gas pipeline, and the igniter is positioned at the air inlet of the burner of the furnace body of the hot blast furnace; the furnace pressure control system mainly comprises a furnace section reducing section of the hot blast furnace, a louvered smoke window adjusting valve, a high-temperature smoke outlet flue of the hot blast furnace and the like; the section reducing section is arranged at the front section of a hearth of the hot blast stove, and an inlet of the sealing fan is respectively connected with an inlet flue of the SCR denitration reactor and an outlet flue of the SCR denitration reactor through a raw smoke gas sealing gas pipeline and a clean smoke gas sealing gas pipeline. The advantage lies in, is favorable to avoiding the high temperature flue gas to flow at the inside direct acceleration of furnace, has effectively increased the flow resistance of high temperature flue gas.
Description
Technical Field
The utility model belongs to the technical field of steel industry sintering, pelletizing flue gas SCR denitration heating, in particular to join in marriage SCR denitration flue gas heating device who takes circumferential weld obturator.
Background
A large amount of industrial flue gas is generated in the production process of iron and steel enterprises and mainly comprises particulate matters and SO2、NOxVarious harmful gaseous pollutants such as HF and dioxin, and solid pollutants such as iron-containing dust and heavy metals seriously damage the ecological environment. Wherein NO discharged by sintering and pelletizing processesxUp to NO of the whole steel millxMore than half of the total amount discharged. The industrial flue gas in the production process of the traditional iron and steel enterprises is directly discharged into the atmosphere after desulfurization, dust removal and waste heat utilization, and is not subjected to denitration treatment. With the increasingly strict requirements of ultralow emission of iron and steel enterprises, the denitration treatment of sintering and pelletizing flue gas becomes a great importance.
The SCR denitration technology is one of the most mature denitration technologies with the most extensive application at present, has the advantages of high denitration efficiency, stable operation, reliable technology and the like, and has been successfully applied to sintering and pellet flue gas denitration treatment in the steel industry at home and abroad. As the sintering and pelletizing flue gas temperature is generally low (100-160 ℃), the optimal activity temperature (280-330 ℃) of the SCR denitration process catalyst is difficult to achieve. Therefore, a sintering and pelletizing flue gas SCR denitration system usually needs to be provided with a hot-blast stove to heat low-temperature raw flue gas, and the temperature of the low-temperature raw flue gas is raised to a window reaction temperature required by an SCR denitration catalyst. The conventional heating method of the prior sintering and pelletizing low-temperature raw flue gas is to directly introduce high-temperature hot air produced by a hot blast furnace into a vertical flue at the inlet of an SCR denitration reactor, and belongs to a direct-combustion and direct-mixing mode. Because the SCR denitration flue system is generally in a high negative pressure working condition (-6500 to-8000 Pa), and the working pressure required by the normal operation of the hearth and the burner of the hot blast stove is only-1000 Pa, the problem that the continuous and stable combustion is difficult to maintain due to the overlarge negative pressure in the hearth of the hot blast stove exists in the actual operation process, the heating efficiency of sintering and pelletizing low-temperature raw flue gas is seriously influenced, and the normal production is influenced.
Disclosure of Invention
An object of the utility model is to provide a join in marriage SCR denitration flue gas heating device who takes circumferential weld obturator adopts multiple stove pressure control technique effectively to have solved the problem that the hot-blast furnace lasts stable burning under the high negative pressure environment (-6500-8000 Pa) of denitration flue gas system. The micro-negative pressure combustion working condition in the hearth of the hot blast stove is maintained, and the denitration reaction efficiency is improved.
An SCR denitration flue gas heating device with a circular seam sealing device comprises a hot blast stove combustion system and a stove pressure control system. The hot blast stove combustion system comprises a combustion-supporting fan 1, a combustion-supporting gas pipeline 2, a combustible gas pipeline 5, a burner 8, an igniter 9 and a hot blast stove main body 10; the combustion-supporting fan 1 is connected with the combustor 8 through a combustion-supporting gas pipeline 2, the blast furnace gas is connected with the combustor 8 through a combustible gas pipeline 5, and the igniter 9 is positioned at the air inlet of the combustor 8 of the hot blast furnace body; the furnace pressure control system mainly comprises a furnace section reducing section 11 of the hot blast furnace, a sealing ring seam I12, a sealing ring seam II 13, a sealing ring seam III 14, a louver type smoke window adjusting valve 15, a high-temperature smoke outlet flue 16 of the hot blast furnace, a high-speed nozzle 17, a sealing fan 24, a raw smoke sealing gas pipeline 20, a clean smoke sealing gas pipeline 22 and a fan outlet sealing gas pipeline 27; the section reducing section 11 is arranged at the front section of a hearth of the hot blast stove, and the area of the section of the hearth is gradually reduced; the first sealing circular seam 12, the second sealing circular seam 13 and the third sealing circular seam 14 are arranged at the middle section of a hearth of the hot blast stove, and an inlet of a sealing fan 24 is respectively connected with an inlet flue 18 of the SCR denitration reactor and an outlet flue 19 of the SCR denitration reactor through a raw smoke gas sealing gas pipeline 20 and a clean smoke gas sealing gas pipeline 22; the outlet of the sealing fan 24 is connected with the side surfaces of the three sealing circular seams through a sealing gas pipeline 27; the hot-blast furnace export is connected with 15 entrys of tripe formula smoke window governing valve, and 15 exports of tripe formula smoke window governing valve are connected with high-speed nozzle 17 through hot-blast furnace high temperature hot air outlet flue 16, and high-speed nozzle 17 is established at SCR denitration reactor entry flue 18 anterior segment.
The first sealing circular seam 12, the second sealing circular seam 13 and the third sealing circular seam 14 are made of high-temperature-resistant materials with strong thermal stability, the distance between every two adjacent circular seams is 0.6m, and part of raw flue gas or clean flue gas of an SCR (selective catalytic reduction) denitration system is introduced into the circular seams to form an air curtain sealing layer, so that the flow resistance of the flue gas in the large hearth is increased.
The high-speed nozzle 17 in the denitration inlet flue adopts a Laval tapered form, and is made of a high-temperature-resistant material with strong thermal stability.
The using method of the heating device comprises the following specific steps and parameters:
1. starting a hot blast stove main body 10, introducing blast furnace gas and combustion-supporting air into a combustor 8, igniting the two mixed gases by an igniter 9 arranged on the combustor 8, and fully combusting the two mixed gases in a hearth of the hot blast stove to generate high-temperature flue gas;
2. the outlet direction of the high-temperature flue gas of the combustor 8 is vertically arranged, so that the high-temperature flue gas is prevented from directly accelerating to flow in a hearth, and the flow resistance of the flue gas is increased by 800-1000 Pa;
3. when the high-temperature flue gas flowing out of the combustor 8 is diffused to the hearth section contraction section 11, the flue gas throttling resistance is increased by 1000-1500 Pa through the hearth section contraction;
4. when the sealing gas adopts denitration raw flue gas, closing a butterfly valve III 23, opening a butterfly valve II 21, a butterfly valve IV 25 and a regulating valve III 26, starting a sealing fan 24, introducing part of the sintering and pelletizing denitration raw flue gas into a sealing annular seam I12, a sealing annular seam II 13 and a sealing annular seam III 14 to form three air curtains, and increasing the flow resistance of the flue gas in the furnace to 3000-3500 Pa; when the denitration clean flue gas is adopted as the sealing gas, closing the second butterfly valve 21, opening the third butterfly valve 23, the fourth butterfly valve 25 and the third regulating valve 26, starting the sealing fan 24, introducing part of the sintering and pellet denitration clean flue gas into the first sealing circular seam 12, the second sealing circular seam 13 and the third sealing circular seam 14 to form three air curtains, and increasing the flow resistance of the flue gas in the furnace to 3000-3500 Pa;
5. the high-temperature flue gas outlet of the hot blast stove is throttled by a valve of the louvered smoke window regulating valve 15, and the flow resistance of the flue gas is increased by 500-2000 Pa;
6. the high-temperature flue gas of the hot blast stove is introduced into a high-speed nozzle 17 in an inlet flue 18 of the SCR denitration reactor to form high-speed jet flow, so that the mixing rate of the high-temperature flue gas and the low-temperature original flue gas is improved, and the flow resistance of the high-temperature flue gas is increased by 1600-2000 Pa.
The utility model has the advantages that:
1. the high-temperature flue gas outlet direction of the hot blast stove burner is vertically arranged, so that the high-temperature flue gas is prevented from directly accelerating to flow in the hearth, the flow resistance of the flue gas is increased, and the combustible gas is ensured to be fully combusted in the hearth.
2. The front section of the hearth of the hot blast stove is provided with a section reducing section, and the flow resistance of high-temperature flue gas in the stove is increased by utilizing the contraction and throttling of the section of the hearth.
3. Three sealing circular seams are arranged in the middle section of a hearth of the hot blast stove, part of denitrated raw flue gas or clean flue gas is sucked to the circular seams through a circular seam sealing fan to form three air curtains, the flow area of high-temperature flue gas in the hearth is limited by using the air curtain sealing principle, dynamic adjustment is realized by interlocking with the internal pressure of the hearth, and the flow resistance of the high-temperature flue gas is effectively increased.
4. The high-temperature flue gas outlet of the hot blast stove is provided with a louvered flue gas window regulating valve, the flow of flue gas is automatically regulated according to the front-back pressure difference of the regulating valve, and the flow resistance of the flue gas is increased by throttling of the valve.
5. Set up high-speed nozzle in the SCR denitration reactor entry flue, utilize the structural feature that the nozzle moves, static pressure conversion to form high-speed efflux, when increase flue gas flow resistance, with the help of the entrainment effect of the high-speed efflux of nozzle, greatly increased the mixing rate of the former flue gas of high-temperature hot-blast and low temperature and the flue gas temperature homogeneity after the mixture, and then improved denitration efficiency.
6. The sealing gas can adopt the original flue gas or the clean flue gas of a denitration system, the internal pressure of the hearth is balanced, the high-temperature flue gas outlet temperature of the hot air furnace is favorably reduced, the temperature mixing uniformity of the high-temperature flue gas and the low-temperature original flue gas is enhanced, and the denitration efficiency is improved.
7. Through multiple hearth pressure control means such as arrangement of the outlet direction of the burner, contraction of the cross section of the hearth, a circular seam sealing device, a louvered smoke window adjusting valve, a high-speed nozzle and the like, the influence of the high negative pressure unfavorable working condition (-6500 to-8000 Pa) of an external SCR denitration flue system on the internal pressure of the hearth is effectively blocked, and the safety and the stability of continuous combustion of the hot blast stove in a high negative pressure environment are ensured.
Drawings
Fig. 1 is a schematic view of the overall structure of the device. The device comprises a combustion-supporting fan 1, a combustion-supporting gas pipeline 2, a butterfly valve I3, a regulating valve I4, a combustible gas pipeline 5, a quick cut-off valve 6, a regulating valve II 7, a combustor 8, an igniter 9, a hot blast stove main body 10, a section reducing section 11, a sealing circular seam I12, a sealing circular seam II 13, a sealing circular seam III 14, a louver type smoke window regulating valve 15, a hot blast stove high-temperature hot air outlet flue 16, a high-speed nozzle 17, an SCR denitration reactor inlet flue 18, an SCR denitration reactor outlet flue 19, a raw smoke gas sealing gas pipeline 20, a butterfly valve II 21, a clean smoke gas sealing gas pipeline 22, a butterfly valve III 23, a sealing fan 24, a butterfly valve IV 25, a regulating valve III 26 and a fan outlet sealing gas pipeline 27.
Detailed Description
An SCR denitration flue gas heating device with a circular seam sealing device comprises a hot blast stove combustion system and a stove pressure control system. The hot blast stove combustion system comprises a combustion-supporting fan 1, a combustion-supporting gas pipeline 2, a combustible gas pipeline 5, a burner 8, an igniter 9 and a hot blast stove main body 10; the combustion-supporting fan 1 is connected with the combustor 8 through a combustion-supporting gas pipeline 2, the blast furnace gas is connected with the combustor 8 through a combustible gas pipeline 5, and the igniter 9 is positioned at an air inlet of the combustion 8 of the hot blast furnace body; the furnace pressure control system mainly comprises a furnace section reducing section 11 of the hot blast furnace, a sealing ring seam I12, a sealing ring seam II 13, a sealing ring seam III 14, a louver type smoke window adjusting valve 15, a high-temperature smoke outlet flue 16 of the hot blast furnace, a high-speed nozzle 17, a sealing fan 24, a raw smoke sealing gas pipeline 20, a clean smoke sealing gas pipeline 22 and a fan outlet sealing gas pipeline 27; the section reducing section 11 is arranged at the front section of a hearth of the hot blast stove, and the area of the section of the hearth is gradually reduced; the first sealing circular seam 12, the second sealing circular seam 13 and the third sealing circular seam 14 are arranged at the middle section of a hearth of the hot blast stove, and an inlet of a sealing fan 24 is respectively connected with an inlet flue 18 of the SCR denitration reactor and an outlet flue 19 of the SCR denitration reactor through a raw smoke gas sealing gas pipeline 20 and a clean smoke gas sealing gas pipeline 22; the outlet of the sealing fan 24 is connected with the side surfaces of the three sealing circular seams through a sealing gas pipeline 27; the hot-blast furnace export is connected with 15 entrys of tripe formula smoke window governing valve, and 15 exports of tripe formula smoke window governing valve are connected with high-speed nozzle 17 through hot-blast furnace high temperature hot air outlet flue 16, and high-speed nozzle 17 is established at SCR denitration reactor entry flue 18 anterior segment.
The first sealing circular seam 12, the second sealing circular seam 13 and the third sealing circular seam 14 are made of high-temperature-resistant materials with strong thermal stability, the distance between every two adjacent circular seams is 0.6m, and part of raw flue gas or clean flue gas of an SCR (selective catalytic reduction) denitration system is introduced into the circular seams to form an air curtain sealing layer, so that the flow resistance of the flue gas in the large hearth is increased.
The high-speed nozzle 17 in the denitration inlet flue adopts a Laval tapered form, and is made of a high-temperature-resistant material with strong thermal stability.
The using method of the heating device comprises the following specific steps and parameters:
1. starting a hot blast stove main body 10, introducing blast furnace gas and combustion-supporting air into a combustor 8, igniting the two mixed gases by an igniter 9 arranged on the combustor 8, and fully combusting the two mixed gases in a hearth of the hot blast stove to generate high-temperature flue gas;
2. the outlet direction of the high-temperature flue gas of the combustor 8 is vertically arranged, so that the high-temperature flue gas is prevented from directly accelerating to flow in a hearth, and the flow resistance of the flue gas is increased by 890 Pa;
3. when the high-temperature flue gas flowing out of the combustor 8 is diffused to the section contraction section 11 of the hearth, the flue gas throttling resistance is increased by 1200Pa through the contraction of the section of the hearth;
4. when the sealing gas adopts denitration raw flue gas, closing a butterfly valve III 23, opening a butterfly valve II 21, a butterfly valve IV 25 and a regulating valve III 26, starting a sealing fan 24, introducing part of the sintering and pelletizing denitration raw flue gas into a sealing annular seam I12, a sealing annular seam II 13 and a sealing annular seam III 14 to form three air curtains, and increasing the flow resistance 3100Pa of the flue gas in the furnace; when the denitration clean flue gas is adopted as the sealing gas, the butterfly valve II 21 is closed, the butterfly valve III 23, the butterfly valve IV 25 and the regulating valve III 26 are opened, the sealing fan 24 is started, and the partially sintered and pellet denitration clean flue gas is introduced into the sealing annular seam I12, the sealing annular seam II 13 and the sealing annular seam III 14 to form three air curtains, so that the flow resistance of the flue gas in the furnace is increased by 3100 Pa;
5. the high-temperature smoke outlet of the hot blast stove is throttled by a valve of the louvered smoke window regulating valve 15, and the smoke flowing resistance is increased by 1600 Pa;
6. the high-temperature flue gas of the hot blast stove is introduced into a high-speed nozzle 17 in an inlet flue 18 of the SCR denitration reactor to form high-speed jet flow, so that the mixing rate of the high-temperature flue gas and the low-temperature original flue gas is improved, and meanwhile, the flow resistance 1860Pa of the high-temperature flue gas is increased.
Claims (3)
1. An SCR denitration flue gas heating device with a circular seam sealing device is characterized by comprising a hot blast stove combustion system and a stove pressure control system; the hot blast stove combustion system comprises a combustion-supporting fan (1), a combustion-supporting gas pipeline (2), a combustible gas pipeline (5), a burner (8), an igniter (9) and a hot blast stove main body (10); the combustion-supporting fan (1) is connected with the combustor (8) through a combustion-supporting gas pipeline (2), the blast furnace gas is connected with the combustor (8) through a combustible gas pipeline (5), and the igniter (9) is positioned at the air inlet of the combustor (8) of the hot blast furnace body; the furnace pressure control system comprises a furnace section reducing section (11) of the hot blast furnace, a sealing circular seam I (12), a sealing circular seam II (13), a sealing circular seam III (14), a louvered smoke window adjusting valve (15), a high-temperature hot air outlet flue (16) of the hot blast furnace, a high-speed nozzle (17), a sealing fan (24), a raw smoke gas sealing gas pipeline (20), a clean smoke gas sealing gas pipeline (22) and a fan outlet sealing gas pipeline (27); the section reducing section (11) is arranged at the front section of the hearth of the hot blast stove; the sealing circular seam I (12), the sealing circular seam II (13) and the sealing circular seam III (14) are arranged at the middle section of a hearth of the hot blast stove, and an inlet of a sealing fan (24) is respectively connected with an inlet flue (18) of the SCR denitration reactor and an outlet flue (19) of the SCR denitration reactor through a raw smoke gas sealing gas pipeline (20) and a clean smoke gas sealing gas pipeline (22); the outlet of the sealing fan (24) is connected with the side surfaces of the three sealing circular seams through a sealing gas pipeline (27); the hot blast stove hearth outlet is connected with the inlet of a shutter type smoke window adjusting valve (15), the outlet of the shutter type smoke window adjusting valve (15) is connected with a high-speed nozzle (17) through a hot blast stove high-temperature hot air outlet flue (16), and the high-speed nozzle (17) is arranged at the front section of an inlet flue (18) of the SCR denitration reactor.
2. The SCR denitration flue gas heating device of claim 1, wherein the first sealing circular seam (12), the second sealing circular seam (13) and the third sealing circular seam (14) are arranged, and the distance between every two adjacent circular seams is 0.6 m.
3. The SCR denitration flue gas heating apparatus of claim 1, wherein the high-speed nozzle (17) in the denitration inlet flue is in a Laval-type form.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921342647.7U CN210801594U (en) | 2019-08-16 | 2019-08-16 | SCR denitration flue gas heating device with annular seam sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921342647.7U CN210801594U (en) | 2019-08-16 | 2019-08-16 | SCR denitration flue gas heating device with annular seam sealing device |
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| Publication Number | Publication Date |
|---|---|
| CN210801594U true CN210801594U (en) | 2020-06-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921342647.7U Withdrawn - After Issue CN210801594U (en) | 2019-08-16 | 2019-08-16 | SCR denitration flue gas heating device with annular seam sealing device |
Country Status (1)
| Country | Link |
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| CN (1) | CN210801594U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425731A (en) * | 2019-08-16 | 2019-11-08 | 北京首钢国际工程技术有限公司 | A kind of SCR denitration Smoke-heating device for wearing circumferential weld obturator |
-
2019
- 2019-08-16 CN CN201921342647.7U patent/CN210801594U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110425731A (en) * | 2019-08-16 | 2019-11-08 | 北京首钢国际工程技术有限公司 | A kind of SCR denitration Smoke-heating device for wearing circumferential weld obturator |
| CN110425731B (en) * | 2019-08-16 | 2024-04-02 | 北京首钢国际工程技术有限公司 | SCR denitration flue gas heating device with circular seam sealing device |
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