CN114018064A - Steel rolling heating furnace flue gas CO emission reduction and waste heat recovery synergistic ultralow emission process - Google Patents
Steel rolling heating furnace flue gas CO emission reduction and waste heat recovery synergistic ultralow emission process Download PDFInfo
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- CN114018064A CN114018064A CN202111359563.6A CN202111359563A CN114018064A CN 114018064 A CN114018064 A CN 114018064A CN 202111359563 A CN202111359563 A CN 202111359563A CN 114018064 A CN114018064 A CN 114018064A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 70
- 239000003546 flue gas Substances 0.000 title claims abstract description 68
- 238000010438 heat treatment Methods 0.000 title claims abstract description 40
- 238000011084 recovery Methods 0.000 title claims abstract description 36
- 239000002918 waste heat Substances 0.000 title claims abstract description 36
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 35
- 239000010959 steel Substances 0.000 title claims abstract description 35
- 238000005096 rolling process Methods 0.000 title claims abstract description 33
- 230000009467 reduction Effects 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000002195 synergetic effect Effects 0.000 title claims description 11
- 230000008569 process Effects 0.000 title abstract description 10
- 239000000779 smoke Substances 0.000 claims abstract description 29
- 239000003426 co-catalyst Substances 0.000 claims abstract description 18
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 18
- 230000023556 desulfurization Effects 0.000 claims abstract description 18
- 239000000428 dust Substances 0.000 claims abstract description 18
- 239000003054 catalyst Substances 0.000 claims abstract description 14
- 239000012159 carrier gas Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001301 oxygen Substances 0.000 claims description 10
- 239000004071 soot Substances 0.000 claims description 9
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 239000003245 coal Substances 0.000 claims description 5
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 239000003034 coal gas Substances 0.000 claims description 3
- 238000006555 catalytic reaction Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical group [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
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- Analytical Chemistry (AREA)
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Abstract
The invention discloses a process for realizing CO emission reduction and waste heat recovery of steel rolling heating furnace flue gas in cooperation with ultralow emission. Comprises an SCR/CO integrated reactor (5), a desulphurization unit (14) and a dust removal unit (15); a CO catalyst bed layer (8) is arranged at the middle lower part of the SCR/CO integrated reactor (5), a denitration catalyst bed layer (7) is arranged at the upper part of the CO catalyst bed layer (8), and a rectification grid (6) is arranged at the top of the SCR/CO integrated reactor (5); an inlet at the lower part of the SCR/CO integrated reactor (5) is connected with a waste heat recovery heat exchanger (10); the waste heat recovery heat exchanger (10) is respectively connected with the preheating heat exchanger (2) and the air-smoke side ultra-low emission system (11) through a smoke pipeline; the preheating heat exchanger (2) is also connected and disconnected through a flue gas pipelineAn inlet at the lower part of the sulfur unit (14) and an outlet at the upper part of the SCR/CO integrated reactor (5); the upper outlet of the desulfurization unit (14) is connected with the inlet of the dust removal unit (15). The invention meets the CO emission reduction requirement of a steel rolling heating furnace, and the hourly mean value of the CO concentration at the flue gas outlet is less than or equal to 2000mg/Nm3。
Description
Technical Field
The invention belongs to the technical field of energy conservation and environmental protection, and particularly relates to a process for realizing CO emission reduction and waste heat recovery of steel rolling heating furnace flue gas in cooperation with ultralow emission.
Background
With the gradual promotion of 'ultra-low emission' in the steel industry, the CO emission reduction standard of industrial flue gas with higher content is improved, and the highest emission concentration of carbon monoxide is not higher than 2000mg/Nm (China national Standard for fixed pollution sources carbon monoxide emission) (DB 13/487 one-year 2002)3And the like.
The steel industry is used as a large-scale emission household of atmospheric pollutants, wherein a steel rolling heating furnace is one of main sources of CO emission, according to field experiment data, smoke components of a certain steel rolling heating furnace after dust removal, desulfurization and denitration are continuously monitored for multiple times for 4 hours, and detection results show that the CO emission value is generally 20000-50000 ppm, and the highest value appears 70000 once+ppm; the emission value cannot meet the requirement of ultra-low emission standard.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a steel rolling heating furnace flue gas CO emission reduction and waste heat recovery synergistic ultralow emission process.
In order to realize the aim of the invention, one aspect of the invention provides a steel rolling heating furnace flue gas CO emission reduction and waste heat recovery synergistic ultralow emission system, which comprises an SCR/CO integrated reactor, a desulfurization unit and a dust removal unit; a CO catalyst bed layer is arranged at the middle lower part of the SCR/CO integrated reactor, a denitration catalyst bed layer is arranged at the upper part of the CO catalyst bed layer, and a rectification grid is arranged at the top of the SCR/CO integrated reactor; an inlet at the lower part of the SCR/CO integrated reactor is connected with a waste heat recovery heat exchanger; the waste heat recovery heat exchanger is respectively connected with the preheating heat exchanger and the air-smoke side ultra-low emission system through a smoke pipeline; the preheating heat exchanger is also connected with an inlet at the lower part of the desulfurization unit and an outlet at the upper part of the SCR/CO integrated reactor through a flue gas pipeline; and an outlet at the upper part of the desulfurization unit is connected with an inlet of the dust removal unit.
According to the embodiment of the invention, the waste heat recovery heat exchanger is connected with a carrier gas taking pipeline, and a start-stop temperature compensation unit is arranged in the carrier gas taking pipeline.
According to the embodiment of the invention, the CO catalyst bed layer is provided with a temperature control system.
According to the embodiment of the invention, the middle section of a flue gas pipeline connected with the preheating heat exchanger and the upper outlet of the SCR/CO integrated reactor is provided with an air mixing and oxygen regulating valve bank and an ammonia injection assembly.
According to the embodiment of the invention, the outlet of the dust removal unit is connected with the induced draft fan and the exhaust funnel.
According to the embodiment of the invention, the SCR/CO integrated reactor is arranged in 5-6 layers, the denitration catalyst bed layer is 2 layers, the CO catalyst bed layer is 2 layers, and 1-2 layers are reserved.
On the other hand, the invention provides a steel rolling heating furnace flue gas CO emission reduction and waste heat recovery synergistic ultralow emission method, which comprises the following steps:
step 1: flue gas discharged from the coal smoke side of the steel rolling heating furnace passes through a preheating heat exchanger, and enters the SCR/CO integrated reactor after the temperature of the flue gas is raised;
step 2: the flue gas is subjected to denitration catalyst bed layer and CO catalyst bed layer reaction in the SCR/CO integrated reactor in sequence, NOx in the flue gas is removed, and simultaneously, the removed CO releases a large amount of reaction heat to increase the temperature of the flue gas; the released heat is subjected to heat exchange treatment through a waste heat recovery heat exchanger and a preheating heat exchanger;
and step 3: and the soot subjected to denitration and CO removal in the SCR/CO integrated reactor enters a desulfurization unit and a dust removal unit for desulfurization and dust removal treatment.
Heating the air smoke of the carrier gas taking pipeline by a part of heat released by CO catalytic reaction in the step 2 through a waste heat recovery heat exchanger, and outputting the heat to an ultra-low discharge system at the air smoke side of the steel rolling heating furnace; the other part is used for discharging flue gas at the side of steel rolling heating soot through a preheating heat exchanger so as to meet the requirements of denitration and CO removal temperature windows.
According to the invention, the CO catalyst bed layer is provided with an intelligent temperature control system, the air-smoke carrier gas taking pipeline is provided with a start-stop temperature compensation unit, and a CO concentration and other parameter monitoring system is configured to control the temperature compensation unit to start and stop, so that the stable operation of the system is ensured.
In the startup and shutdown stage of the invention, because the catalyst has the requirements of preheating, heat preservation and cooling, a temperature compensation unit is arranged on the heat output passage, and the waste heat recovery heat exchanger is used as a heat input facility during the startup and shutdown period; the temperature compensation unit can use a gas hot blast stove or other heat tracing equipment.
Compared with the prior art, the invention has the following beneficial effects.
(1) The invention meets the CO emission reduction requirement of a steel rolling heating furnace, and the hourly mean value of the CO concentration at the flue gas outlet is less than or equal to 2000mg/Nm3(1600 ppm), and CO emission reduction is implemented on the soot side of the steel rolling heating furnace.
(2) According to the invention, CO emission reduction is implemented on the coal smoke side of the steel rolling heating furnace, the heat released by catalytic combustion can simultaneously meet the temperature rise requirement of the denitration reaction of the coal smoke and the air smoke, large-scale external gas compensation is not needed, and the external energy consumption of the system is saved.
(3) The intelligent control system is provided, and because the fluctuation speed of the CO concentration in the flue gas is high, the fluctuation range is large, and the system temperature rise is strongly related to a plurality of parameters such as the CO concentration of the flue gas, the oxygen content, the flue gas flow, the system resistance loss and the like, the intelligent control system is adopted to monitor and automatically evaluate the temperature change of CO catalytic combustion and the CO concentration parameter, and the start and stop of the temperature compensation unit can be automatically adjusted to ensure the reaction temperature of the SCR catalyst; the smoke oxygen content measurement control system is adopted, the opening of an electric valve of the air mixing and oxygen regulating system can be accurately adjusted, and therefore stable operation of the ultralow emission system is guaranteed.
Drawings
FIG. 1 is a process flow diagram of the CO emission reduction and waste heat recovery synergistic ultralow emission process of the flue gas of a steel rolling heating furnace.
In the figure: the method comprises the following steps of 1, a coal smoke side of a steel rolling heating furnace, 2, a preheating heat exchanger, 3, an air mixing and oxygen regulating valve bank, 4, an ammonia injection assembly, 5, an SCR/CO integrated reactor, 6, a rectifying grid, 7, a denitration catalyst bed, 8, a CO catalyst bed, 9, a temperature control system, 10, a waste heat recovery heat exchanger, 11, an air smoke side ultralow emission system, 12, a carrier gas taking pipeline, 13, a starting and stopping temperature compensation unit, 14, a desulfurization unit, 15, a dust removal unit, 16, an induced draft fan and 17, and the like.
Detailed Description
The present invention is described in further detail below with reference to the attached drawings.
The invention relates to a process which takes intelligent control, CO emission reduction, waste heat recovery and ultra-low emission of flue gas as core and innovation points.
The CO catalytic oxidation technology principle is that the CO and O contained in the industrial flue gas are treated by the action of a catalyst2In an environment below the ignition point (the ignition point of CO is 650 ℃), enabling CO and O2Reaction to CO2So as to achieve the purpose of harmless removal. At the same time, CO and O2The oxidation reaction of (a) is a strongly exothermic reaction, and the pure CO has a heat value of 12.64 MJ/Nm3（CO + O2 → CO2 + 12.64 MJ/Nm3）。
The process only performs CO emission reduction and flue gas ultra-low emission on the flue gas side of a group of steel rolling heating furnaces, and performs denitration, desulfurization, dust removal and ultra-low emission on empty flue gas, and the process of the flue gas is explained as follows: flue gas flow rate 60000Nm3H, wherein the CO content is 12000-46000ppm, O2More than 6 percent and the soot temperature is 125 ℃.
The steel rolling heating furnace flue gas CO emission reduction and waste heat recovery synergistic ultra-low emission system comprises an SCR/CO integrated reactor 5, a desulfurization unit 14 and a dust removal unit 15; a CO catalyst bed layer 8 is arranged at the middle lower part of the SCR/CO integrated reactor 5, a denitration catalyst bed layer 7 is arranged at the upper part of the CO catalyst bed layer 8, and a rectification grid 6 is arranged at the top of the SCR/CO integrated reactor 5; an inlet at the lower part of the SCR/CO integrated reactor 5 is connected with a waste heat recovery heat exchanger 10; the waste heat recovery heat exchanger 10 is respectively connected with the preheating heat exchanger 2 and the air-smoke side ultra-low emission system 11 through smoke pipelines; the preheating heat exchanger 2 is also connected with an inlet at the lower part of the desulfurization unit 14 and an outlet at the upper part of the SCR/CO integrated reactor 5 through a flue gas pipeline; the outlet at the upper part of the desulfurization unit 14 is connected with the inlet of the dust removal unit 15.
The waste heat recovery heat exchanger 10 is connected with a carrier gas taking pipeline 12, and a starting and stopping temperature compensation unit 13 is arranged in the carrier gas taking pipeline 12.
The CO catalyst bed layer 8 is provided with a temperature control system 9.
Flue gas discharged from a coal gas side 1 of a steel rolling heating furnace passes through a preheating heat exchanger 2, the temperature of the flue gas is raised, a flue gas flow field is adjusted through a rectifying grating 6, the flue gas enters an SCR/CO integrated reactor 5, the temperature of the flue gas is raised by about 190 ℃ through the preheating heat exchanger, a mixed air oxygen regulating valve group 3 and an ammonia injection assembly 4 are respectively configured at the middle section of a flue gas pipeline to regulate the atmosphere, and the temperature of the flue gas is about 280 ℃ when the flue gas is at an inlet of the SCR/CO integrated reactor 5.
Before the flue gas enters the SCR/CO integrated reactor 5 for denitration, the opening of an electric valve of the air mixing and oxygen regulating system is accurately adjusted through the oxygen concentration monitoring and controlling system in the flue gas, so that the denitration and CO reaction efficiency is ensured.
The flue gas undergoes denitration and CO removal reactions in the SCR/CO integrated reactor 5 in sequence, NOx in the flue gas is removed, and simultaneously, the removed CO releases a large amount of reaction heat to cause the temperature of the flue gas to rise; according to the calculation of the average CO concentration in the flue gas of 16000ppm, the heat released by CO catalytic combustion can cause the temperature of the flue gas to rise by about 130 ℃.
Further, a part of the released heat is heated by the waste heat recovery heat exchanger 10 to carry the gas and output the heat to the ultra-low discharge system 11 at the air-smoke side of the steel rolling heating furnace; the other part is used for heating the flue gas discharged from the coal gas side 1 of the steel rolling heating furnace through a preheating heat exchanger 2 so as to meet the requirements of denitration and CO removal temperature windows; according to the check calculation of the conditions, the temperature of the flue gas at the outlet of the SCR/CO integrated reactor 5 is about 405 ℃, the temperature of the flue gas recovered by the waste heat recovery heat exchanger 10 is 380 ℃, and the temperature of the flue gas entering the preheating heat exchanger 2 is 345 ℃.
Further, an open-close temperature compensation unit 13 is arranged in the air-smoke low-temperature end carrier gas taking pipeline 12, and when the heating furnace is not stably operated, the heating furnace is controlled to open and close the air-smoke side ultra-low emission system 11 through intelligent monitoring and control of the smoke temperature, the CO concentration and the CO catalytic efficiency, so that the open and close of the temperature compensation unit are controlled in an interlocking manner, and the heat energy requirement of the air-smoke side ultra-low emission system 11 is met.
Once the heating furnace air smoke side ultralow emission system 11 runs stably, the heat released by CO catalytic combustion can meet the heat energy requirements of a group of heating furnace soot and air smoke, and the supply of external energy is cut off.
Further, the temperature of the soot after denitration and CO removal is reduced to 155 ℃, the soot enters the desulfurization unit 14 and the dust removal unit 15, and the soot reaches SO2And the ultra-low emission requirement of the particulate matters is met, and then the particulate matters are discharged to the atmosphere through an induced draft fan 16 and an exhaust funnel 17.
When the average concentration of CO at the inlet of the system is less than or equal to 30000ppm, the oxygen content in the flue gas is more than or equal to 6 percent, the catalyst use space velocity is 2000h according to the condition that the activation temperature of the CO catalyst is more than or equal to 250 ℃ and the catalyst use space velocity is more than or equal to-1The hourly mean value of the outlet CO concentration is less than or equal to 2000mg/Nm3(1600 ppm) design.
The invention is not limited to the details of construction set forth above, as such modifications and variations that fall within the spirit and scope of the invention are possible.
Claims (8)
1. The steel rolling heating furnace flue gas CO emission reduction and waste heat recovery synergistic ultralow emission system comprises an SCR/CO integrated reactor (5), a desulfurization unit (14) and a dust removal unit (15); the device is characterized in that a CO catalyst bed layer (8) is arranged at the middle lower part of the SCR/CO integrated reactor (5), a denitration catalyst bed layer (7) is arranged at the upper part of the CO catalyst bed layer (8), and a rectification grid (6) is arranged at the top of the SCR/CO integrated reactor (5); an inlet at the lower part of the SCR/CO integrated reactor (5) is connected with a waste heat recovery heat exchanger (10); the waste heat recovery heat exchanger (10) is respectively connected with the preheating heat exchanger (2) and the air-smoke side ultra-low emission system (11) through a smoke pipeline; the preheating heat exchanger (2) is also connected with an inlet at the lower part of the desulfurization unit (14) and an outlet at the upper part of the SCR/CO integrated reactor (5) through a flue gas pipeline; and an outlet at the upper part of the desulfurization unit (14) is connected with an inlet of the dust removal unit (15).
2. The system for the CO emission reduction of the flue gas of the steel rolling heating furnace and the synergistic ultralow emission of the waste heat recovery according to claim 1, wherein the waste heat recovery heat exchanger (10) is connected with a carrier gas taking pipeline (12), and a start-stop temperature compensation unit (13) is arranged in the carrier gas taking pipeline (12).
3. The system for the CO-emission reduction of flue gas of a steel rolling heating furnace and the CO-recovery of waste heat in an ultra-low emission manner as claimed in claim 1, wherein the CO catalyst bed layer (8) is provided with a temperature control system (9).
4. The system for the CO emission reduction of the flue gas of the steel rolling heating furnace and the synergistic ultra-low emission of the waste heat recovery according to claim 1, wherein a mixed air oxygen regulating valve bank (3) and an ammonia injection assembly (4) are arranged at the middle section of a flue gas pipeline connected with an upper outlet of the preheating heat exchanger (2) and the SCR/CO integrated reactor (5).
5. The system for the CO emission reduction of the flue gas of the steel rolling heating furnace and the collaborative ultra-low emission of the waste heat recovery according to claim 1, wherein the outlet of the dust removal unit (15) is connected with a draught fan (16) and an exhaust funnel (17).
6. The steel rolling heating furnace flue gas CO emission reduction and waste heat recovery synergistic ultralow emission system as claimed in claim 1, wherein the SCR/CO integrated reactor (5) is installed in 5-6 layers, the denitration catalyst bed layer (7) is 2 layers, and the CO catalyst bed layer (8) is 2 layers for standby 1-2 layers.
7. The method for realizing the coordinated ultralow emission of the CO emission reduction and the waste heat recovery of the flue gas of the steel rolling heating furnace by adopting the system of any one of claims 1 to 6 is characterized by comprising the following steps:
step 1: flue gas discharged from a coal gas side (1) of a steel rolling heating furnace passes through a preheating heat exchanger (2), the temperature of the flue gas is raised, and the flue gas enters an SCR/CO integrated reactor (5);
step 2: the flue gas is subjected to the reaction of a denitration catalyst bed layer (7) and a CO catalyst bed layer (8) in an SCR/CO integrated reactor (5) in sequence, NOx in the flue gas is removed, and simultaneously, a large amount of reaction heat is released by the removed CO, so that the temperature of the flue gas rises; the released heat is subjected to heat exchange treatment through a waste heat recovery heat exchanger (10) and a preheating heat exchanger (2);
and step 3: the soot subjected to denitration and CO removal in the SCR/CO integrated reactor (5) enters a desulfurization unit (14) and a dust removal unit (15) for desulfurization and dust removal treatment.
8. The method as set forth in claim 7, characterized in that a part of heat released by CO catalytic reaction in the step 2 is used for heating the air smoke in the carrier gas taking pipeline (12) through the waste heat recovery heat exchanger (10) and outputting the heat to the ultra-low emission system (11) on the air smoke side of the steel rolling heating furnace; the other part is used for discharging flue gas from a steel rolling heating coal smoke side (1) through a preheating heat exchanger (2) so as to meet the requirements of denitration and CO removal temperature windows.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116020574A (en) * | 2022-12-31 | 2023-04-28 | 中钢集团天澄环保科技股份有限公司 | Integral carbon monoxide purifying catalyst with protective agent and preparation method and application thereof |
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