Chemical looping reaction system for co-processing sintering flue gas and coal gas

Abstract

The utility model discloses a chemical looping reaction system for co-processing sintering flue gas and coal gas, which comprises a sintering flue gas reactor, the upper part of the sintering flue gas reactor is connected with a first gas-solid separator, the lower part of the first gas-solid separator is connected with a first material return valve, the first material return valve is connected with a coal gas reactor, and the middle lower part of the coal gas reactor is provided with an overflow port; the overflow port is connected with the sintering flue gas reactor through an overflow pipe, and the sintering flue gas reactor and the coal gas reactor are filled with oxygen carriers. The device has the beneficial effects that the sintering flue gas and various coal gases of the steel mill can be cooperatively treated; heat and oxygen of the sintering flue gas are recycled; pollutants such as NOx, SO2, CO and dioxin in the sintering flue gas are treated; high-quality steam is produced for heat supply or power generation; and CO2 generated by coal gas combustion is enriched.

Description

Technical Field

[0001] The present application belongs to the technical field of energy conservation and emission reduction, and specifically relates to a chemical chain reaction system for collaboratively treating sintering flue gas and coal gas. Background Art

[0002] The steel industry is a major carbon emitter. The steelmaking process is complicated and many processes produce various by-products. The sintering flue gas produced during the sintering process is a low-temperature, high-oxygen waste gas containing a large amount of NO x , SO2, CO, dioxins and other pollutants, which seriously pollute the environment. The current conventional treatment method is to discharge it after desulfurization, denitrification and dust removal, which does not effectively utilize its heat and oxygen.

[0003] Typical sintering flue gas compositions are shown below:

[0004] project unit Numerical Flue gas temperature ℃ 160 Moisture content (volume) Vol% 12 CO content (volume) Vol% 1 Oxygen content (volume) Vol% 15 <![CDATA[CO2 content (volume)]]> Vol% 0 <![CDATA[Volume content of N2]]> Vol% 72 <![CDATA[SO2 concentration]]> <![CDATA[mg / Nm 3 ]]> 2000 <![CDATA[NO x Concentration]]> <![CDATA[mg / Nm 3 ]]> 350 Dust concentration <![CDATA[mg / Nm 3 ]]> 50～60

[0005] Blast furnace gas, a combustible gas produced during the blast furnace ironmaking process, has a low calorific value and can be used for power generation or chemical production. Converter gas, a medium-calorific gas produced during the converter steelmaking process, has a high CO content, and its safe utilization is a hot topic for steel companies both domestically and internationally. Coke oven gas, a combustible byproduct produced during the coking process in coke ovens, has a high calorific value and can be used as domestic fuel or for power generation or chemical production.

[0006] Typical gas composition is as follows:

[0007]

[0008]

[0009] When coal gas is directly burned as fuel to generate electricity, a large amount of low-concentration CO2 is emitted, and the cost of carbon capture is high.

[0010] Patent 202022557533.3 proposes a "sintering flue gas coordinated treatment system," comprising a flue gas conveying pipeline and an internally heated reactor, a cyclone dust collector, a rapid desuperheater, a desulfurization tower, a dust collector, an induced draft fan, and a gas exhaust device, all connected in series along the flue gas conveying direction. The reactor in this system uses the design principles of a conventional coal-fired boiler furnace, but the flue gas velocity and temperature differ from those of the sintering flue gas reactor in this application, representing a different type of technology.

[0011] Patent 201711365220.4 proposes a "Converter Gas Dry Dust Removal Waste Heat Recovery System and Process." This system, which includes a flue gas filter, chemical looping combustion equipment, and a waste heat boiler, can recover sensible heat energy from converter gas below 900°C, achieving zero converter gas emission without the need for explosion relief valves. It can also intermittently process converter gas for continuous energy supply. This application solution can collaboratively process blast furnace gas, converter gas, and coke oven gas, allowing for any combination of these gases. Utility Model Content

[0012] In order to efficiently and economically treat sintering flue gas, while increasing the CO2 concentration of flue gas from coal gas power generation and reducing the cost of carbon capture, this application proposes a chemical chain reaction system for the coordinated treatment of sintering flue gas and coal gas. Compared with the existing technologies for direct treatment of sintering flue gas and direct combustion of coal gas for power generation, this application scheme can coordinate the treatment of steel plant sintering flue gas and various types of coal gas; recycle the heat and oxygen content of sintering flue gas; treat NO in sintering flue gas; x , SO2, CO, dioxins and other pollutants; produce high-quality steam for heating or power generation; enrich CO2 produced by coal gas combustion.

[0013] The purpose of this application is achieved through the following technical solutions:

[0014] A chemical chain reaction system for collaboratively processing sintering flue gas and coal gas comprises a sintering flue gas reactor, wherein the upper portion of the sintering flue gas reactor is connected to a first gas-solid separator, the lower portion of the first gas-solid separator is connected to a first return valve, the first return valve is connected to the coal gas reactor, an overflow port is provided in the middle and lower portion of the coal gas reactor, the overflow port is connected to the sintering flue gas reactor via an overflow pipe, and the sintering flue gas reactor and the coal gas reactor are filled with an oxygen carrier.

[0015] Furthermore, the sintering flue gas reactor adopts a fast bed design, with a flue gas velocity between 7 and 15 m / s, and the coal gas reactor adopts a bubbling bed design, with a flue gas velocity between 1 and 3 m / s.

[0016] Furthermore, the first gas-solid separator is in the form of two or more stages connected in series.

[0017] Furthermore, the upper portion of the coal gas reactor is connected to the second gas-solid separator, the lower portion of the second gas-solid separator is connected to the second return valve, and the second return valve is connected to the coal gas reactor.

[0018] Furthermore, the first gas-solid separator is a cyclone separator, and the first return valve is a U-shaped return valve; the second gas-solid separator is a cyclone separator, and the second return valve is a U-shaped return valve.

[0019] Furthermore, it also includes a sintering flue gas generating system, which is connected to the dust collector, the dust collector is connected to the booster fan, and the booster fan is connected to the wind chamber at the bottom of the sintering flue gas reactor.

[0020] Furthermore, it also includes a blast furnace gas generating system, a converter gas generating system and a coke oven gas generating system. The blast furnace gas generating system passes through a first regulating damper, the converter gas generating system passes through a second regulating damper and the coke oven gas generating system passes through a third regulating damper and is connected to the gas reactor through a connecting flue.

[0021] Furthermore, the top of the first gas-solid separator is connected to the first steam generator, the first steam generator is connected to the first flue gas purification device, and the first flue gas purification device is connected to the chimney.

[0022] Furthermore, the top of the second gas-solid separator is connected to the second steam generator, the second steam generator is connected to the second flue gas purification device, and the second flue gas purification device is connected to the CO2 purification device.

[0023] Furthermore, the second flue gas purification device is connected to a recirculation fan, and the recirculation fan is connected to the bottom of the coal gas reactor.

[0024] Beneficial effects of this application:

[0025] 1. It can collaboratively process steel mill sintering flue gas and various types of coal gas.

[0026] 2. Recycle the heat and oxygen of sintering flue gas; treat NO in sintering flue gas x , SO2, CO, dioxins and other pollutants.

[0027] 3. Produce high-quality steam for heating or power generation.

[0028] 4. Enrich CO2 produced by coal gas combustion.

[0029] The aforementioned main solution of this application and its further options can be freely combined to form multiple solutions, all of which are solutions that can be adopted and protected by this application; and in this application, (non-conflicting options) can also be freely combined with each other and with other options. After understanding this solution, those skilled in the art will understand that there are many combinations based on existing technology and common knowledge, all of which are technical solutions to be protected by this application, and they are not exhaustive here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the structural principle diagram of this application.

[0031] Figure 2 This is a schematic diagram of the two-stage series structure of the first gas-solid separator of this application.

[0032] In the figure: 1-sintering flue gas reactor, 2-first gas-solid separator, 3-first return valve, 4-gas reactor, 5-overflow pipe, 6-oxygen carrier, 7-second gas-solid separator, 8-second return valve, 9-connecting flue, 11-first steam generator, 12-first flue gas purification device, 13-chimney, 21-sintering flue gas generating system, 22-dust collector, 23-booster fan, 41-second steam generator, 42-second flue gas purification device, 43-CO2 purification device, 31-recirculation fan, 51-blast furnace gas generating system, 52-converter gas generating system, 53-coke oven gas generating system, 61-first regulating damper, 62-second regulating damper, 63-third regulating damper, 201-first gas-solid separator A, 202-first gas-solid separator B, 301-first return valve A, 302-second return valve B. DETAILED DESCRIPTION

[0033] The present application will be further described below with reference to specific embodiments and accompanying drawings.

[0034] Example 1

[0035] refer to Figure 1 and Figure 2 As shown, a chemical chain reaction system for collaboratively processing sintering flue gas and coal gas includes a sintering flue gas reactor 1, a first gas-solid separator 2, a first return valve 3, a coal gas reactor 4, an overflow pipe 5, an oxygen carrier 6, a second gas-solid separator 7, a second return valve 8, a connecting flue 9, a first steam generator 11, a first flue gas purification device 12, a chimney 13, a sintering flue gas generating system 21, a dust collector 22, a booster fan 23, a second steam generator 41, a second flue gas purification device 42, a CO2 purification device 43, a recirculation fan 31, a blast furnace gas generating system 51, a converter gas generating system 52, a coke oven gas generating system 53, a first regulating damper 61, a second regulating damper 62 and a third regulating damper 63.

[0036] The upper part of the sintering flue gas reactor 1 is connected to the first gas-solid separator 2, the lower part of the first gas-solid separator 2 is connected to the first return valve 3, the first return valve 3 is connected to the coal gas reactor 4, and an overflow port is opened in the middle and lower part of the coal gas reactor 4. The overflow port is connected to the lower part of the sintering flue gas reactor 1 through an overflow pipe 5. The sintering flue gas reactor 1 and the coal gas reactor 4 are filled with oxygen carriers 6.

[0037] Sintering flue gas reactor 1 uses a fast-bed design, with flue gas velocities between 7 and 15 m / s. Coal gas reactor 4 uses a bubbling bed design, with flue gas velocities between 1 and 3 m / s. Oxygen carrier 6 continuously circulates between sintering flue gas reactor 1 and coal gas reactor 4, undergoing a chemical reaction.

[0038] In the sintering flue gas reactor 1, the low-valent oxygen carrier reacts chemically with the oxygen in the sintering flue gas and is oxidized into a high-valent oxygen carrier. The main reaction formula is: 2Me x O y +O2→2Me x O y+1 The reaction releases a large amount of heat, maintaining the temperature in the sintering flue gas reactor 1 at 950-1050° C. The high temperature environment is used to remove CO and dioxins in the sintering flue gas.

[0039] The first gas-solid separator 2 is a cyclone separator, and the first return valve 3 is a U-shaped return valve. To minimize oxygen carrier loss in the flue gas, the first gas-solid separator 2 is a two-stage or multi-stage series arrangement. The first gas-solid separator 2 separates the flue gas and oxygen carrier after the reaction in the sintering flue gas reactor 1. The flue gas is discharged from the top for subsequent treatment, while the oxygen carrier is discharged from the bottom through the first return valve 3 and enters the coal gas reactor 4.

[0040] In the coal gas reactor 4, the high-valent oxygen carrier reacts with CO, H2, C m H n Chemical reactions occur and are reduced to low-valent oxygen carriers. The main reaction formula is: Me x O y+1 +CO+H2+C m H n →

[0041] Me x O y +CO2+H2O, with the reaction amount of each reactant determined by the gas composition. The temperature of the gas reactor 4 is maintained at 850-950°C. The oxygen carrier above the overflow port in the gas reactor 4 circulates back through the overflow pipe 5, allowing the oxygen carrier to circulate back and forth between the sintering flue gas reactor 1 and the gas reactor 4, continuously transferring heat and oxygen.

[0042] The upper portion of the gas reactor 4 is connected to a second gas-solid separator 7, the lower portion of which is connected to a second return valve 8, which is in turn connected to the gas reactor 4. The second gas-solid separator 7 is a cyclone separator, and the second return valve 8 is a U-shaped return valve. The second gas-solid separator 7 separates the flue gas and oxygen carrier after the reaction in the gas reactor 4. The gas is discharged from the upper portion for subsequent processing, while the oxygen carrier is discharged from the lower portion and returned to the gas reactor 4 through the second return valve 8.

[0043] The sintering flue gas generation system 21 is connected to the dust collector 22, which is connected to the booster fan 23, which is connected to the bottom air chamber of the sintering flue gas reactor 1. The sintering flue gas generation system 21 is the source of sintering flue gas production. After dust removal and boosting, the produced sintering flue gas is fed into the sintering flue gas reactor 1 for reaction treatment.

[0044] Blast furnace gas generation system 51, converter gas generation system 52, and coke oven gas generation system 53 are the sources of blast furnace gas, converter gas, and coke oven gas, respectively. Blast furnace gas generation system 51 passes through a first damper 61, converter gas generation system 52 passes through a second damper 62, and coke oven gas generation system 53 passes through a third damper 63, all connected to gas reactor 4 via connecting flue 9. By adjusting the dampers, blast furnace gas, coke oven gas, and converter gas can be mixed in a specific proportion and fed into the gas reactor, or they can be fed separately.

[0045] The top of the first gas-solid separator 2 is connected to the first steam generator 11, the first steam generator 11 is connected to the first flue gas purification device 12, and the first flue gas purification device 12 is connected to the chimney 13. The top of the second gas-solid separator 7 is connected to the second steam generator 41, the second steam generator 41 is connected to the second flue gas purification device 42, and the second flue gas purification device 42 is connected to the CO2 purification device 43.

[0046] The steam generator is used to reduce the outlet flue gas temperature of the sintering flue gas reactor and the coal gas reactor, and heat the feed water into high-quality steam for heating or power generation. The flue gas purification device is used to remove SO2 and NO in the flue gas. X , dust and other pollutants. The CO2 purification device is used to purify the CO2 in the flue gas at the outlet of the coal gas reactor to obtain high-concentration CO2.

[0047] The second flue gas purification device 42 is connected to the recirculation fan 31, which is connected to the bottom of the coal gas reactor 4. The recirculation fan 31 pressurizes the partially purified flue gas and sends it back to the coal gas reactor 4 to maintain the fluidization of the coal gas reactor.

[0048] Example 2

[0049] refer to Figure 1 and Figure 2 As shown, a chemical chain reaction system for collaboratively processing sintering flue gas and coal gas includes a sintering flue gas reactor 1, a first gas-solid separator 2, a first return valve 3, a coal gas reactor 4, an overflow pipe 5, an oxygen carrier 6, a second gas-solid separator 7, a second return valve 8, a connecting flue 9, a first steam generator 11, a first flue gas purification device 12, a chimney 13, a sintering flue gas generating system 21, a dust collector 22, a booster fan 23, a second steam generator 41, a second flue gas purification device 42, a CO2 purification device 43, a recirculation fan 31, a blast furnace gas generating system 51, a converter gas generating system 52, a coke oven gas generating system 53, a first regulating damper 61, a second regulating damper 62 and a third regulating damper 63.

[0050] The upper part of the sintering flue gas reactor 1 is connected to the first gas-solid separator 2, the lower part of the first gas-solid separator 2 is connected to the first return valve 3, the first return valve 3 is connected to the coal gas reactor 4, and an overflow port is opened in the middle and lower part of the coal gas reactor 4. The overflow port is connected to the lower part of the sintering flue gas reactor 1 through an overflow pipe 5. The sintering flue gas reactor 1 and the coal gas reactor 4 are filled with oxygen carriers 6.

[0051] The sintering flue gas reactor 1 uses a fast bed design with a flue gas velocity of 10 m / s, while the coal gas reactor 4 uses a bubbling bed design with a flue gas velocity of 1.5 m / s. The oxygen carrier 6 continuously circulates between the sintering flue gas reactor 1 and the coal gas reactor 4, while a chemical reaction occurs.

[0052] In the sintering flue gas reactor 1, the low-valent oxygen carrier reacts chemically with the oxygen in the sintering flue gas and is oxidized into a high-valent oxygen carrier. The main reaction formula is: 2Me x O y +O2→2Me x O y+1 The reaction releases a large amount of heat, maintaining the temperature in the sintering flue gas reactor 1 at 1000° C. The high temperature environment is used to remove CO and dioxins in the sintering flue gas.

[0053] The first gas-solid separator 2 is a cyclone separator, and the first return valve 3 is a U-shaped return valve. To reduce the loss of oxygen carriers in the flue gas, the first gas-solid separator 2 adopts a two-stage series structure. Specifically, the first gas-solid separator 2 includes a first gas-solid separator A201 and a first gas-solid separator B202. The upper part of the sintering flue gas reactor 1 is connected to the first gas-solid separator A201, and the upper part of the first gas-solid separator A201 is connected to the first gas-solid separator B202. The first gas-solid separator A201 and the first gas-solid separator B202 are connected to the coal gas reactor 4 via the first return valve A301 and the first return valve B302, respectively.

[0054] The first gas-solid separator A201 and the first gas-solid separator B202 perform secondary separation on the flue gas and oxygen carrier after the reaction in the sintering flue gas reactor 1. The flue gas is discharged from the upper part of the first gas-solid separator B202 for subsequent treatment, and the oxygen carrier is discharged from the lower part of the two-stage separator and enters the coal gas reactor 4 through the return valve.

[0055] In the coal gas reactor 4, the high-valent oxygen carrier reacts with CO, H2, C m H n Chemical reactions occur and are reduced to low-valent oxygen carriers. The main reaction formula is: Me x O y+1 +CO+H2+C m H n →

[0056] Me x Oy +CO2+H2O, with the reaction amount of each reactant determined by the gas composition. The temperature of the gas reactor 4 is maintained at 900°C. The oxygen carrier above the overflow port in the gas reactor 4 circulates back through the overflow pipe 5, allowing the oxygen carrier to circulate back and forth between the sintering flue gas reactor 1 and the gas reactor 4, continuously transferring heat and oxygen.

[0057] The upper portion of the gas reactor 4 is connected to a second gas-solid separator 7, the lower portion of which is connected to a second return valve 8, which is in turn connected to the gas reactor 4. The second gas-solid separator 7 is a cyclone separator, and the second return valve 8 is a U-shaped return valve. The second gas-solid separator 7 separates the flue gas and oxygen carrier after the reaction in the gas reactor 4. The gas is discharged from the upper portion for subsequent processing, while the oxygen carrier is discharged from the lower portion and returned to the gas reactor 4 through the second return valve 8.

[0058] The sintering flue gas generation system 21 is connected to the dust collector 22, which is connected to the booster fan 23, which is connected to the bottom air chamber of the sintering flue gas reactor 1. The sintering flue gas generation system 21 is the source of sintering flue gas production. After dust removal and boosting, the produced sintering flue gas is fed into the sintering flue gas reactor 1 for reaction treatment.

[0059] Blast furnace gas generation system 51, converter gas generation system 52, and coke oven gas generation system 53 are the sources of blast furnace gas, converter gas, and coke oven gas, respectively. Blast furnace gas generation system 51 passes through a first damper 61, converter gas generation system 52 passes through a second damper 62, and coke oven gas generation system 53 passes through a third damper 63, all connected to gas reactor 4 via connecting flue 9. By adjusting the dampers, blast furnace gas, coke oven gas, and converter gas can be mixed in a specific proportion and fed into the gas reactor, or they can be fed separately.

[0060] The top of the first gas-solid separator 2 is connected to the first steam generator 11, the first steam generator 11 is connected to the first flue gas purification device 12, and the first flue gas purification device 12 is connected to the chimney 13. The top of the second gas-solid separator 7 is connected to the second steam generator 41, the second steam generator 41 is connected to the second flue gas purification device 42, and the second flue gas purification device 42 is connected to the CO2 purification device 43.

[0061] The steam generator is used to reduce the outlet flue gas temperature of the sintering flue gas reactor and the coal gas reactor, and heat the feed water into high-quality steam for heating or power generation. The flue gas purification device is used to remove SO2 and NO in the flue gas. X , dust and other pollutants. The CO2 purification device is used to purify the CO2 in the flue gas at the outlet of the coal gas reactor to obtain high-concentration CO2.

[0062] The second flue gas purification device 42 is connected to the recirculation fan 31, which is connected to the bottom of the coal gas reactor 4. The recirculation fan 31 pressurizes the partially purified flue gas and sends it back to the coal gas reactor 4 to maintain the fluidization of the coal gas reactor.

[0063] The parameters before and after the sintering flue gas treatment using this embodiment are as follows. This solution makes full use of the heat and oxygen content of the sintering flue gas, significantly reducing SO2 and NO X , dust, dioxins and other pollutants.

[0064] project unit Before treatment After processing Flue gas temperature ℃ 160 120 Moisture content (volume) Vol% 12 14 CO content (volume) Vol% 1 0 Oxygen content (volume) Vol% 15 2 <![CDATA[Volume content of N2]]> Vol% 72 84 <![CDATA[SO2 concentration]]> <![CDATA[mg / Nm 3 ]]> 2000 ≤35 <![CDATA[NO x Concentration]]> <![CDATA[mg / Nm 3 ]]> 350 ≤50 Dust concentration <![CDATA[mg / Nm 3 ]]> 50～60 ≤5 Dioxins <![CDATA[ngTEQ / Nm 3 ]]> 30～60 ≤0.1

[0065] The comparison of CO2 concentration (dry state) in flue gas generated by the scheme of this embodiment and conventional gas furnace combustion power generation is shown below. This scheme greatly increases the CO2 concentration in the flue gas generated by gas combustion and reduces the cost of carbon capture.

[0066] project unit Conventional gas stove This patent solution blast furnace gas ％ 26.4 43.1 converter gas ％ 29.8 73.4 coke oven gas ％ 8.5 86.6

[0067] The aforementioned basic examples and their further selected examples can be freely combined to form multiple embodiments, all of which are embodiments that can be adopted and claimed for protection in this application. In this application, each selected example can be arbitrarily combined with any other basic examples and selected examples.

[0068] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A chemical chain reaction system for collaboratively treating sintering flue gas and coal gas, comprising a sintering flue gas reactor (1), characterized in that: The upper part of the sintering flue gas reactor (1) is connected to the first gas-solid separator (2), the lower part of the first gas-solid separator (2) is connected to the first return valve (3), the first return valve (3) is connected to the coal gas reactor (4), an overflow port is provided in the middle and lower part of the coal gas reactor (4), the overflow port is connected to the sintering flue gas reactor (1) through an overflow pipe (5), and the sintering flue gas reactor (1) and the coal gas reactor (4) are filled with an oxygen carrier (6).

2. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 1 is characterized in that: The sintering flue gas reactor (1) adopts a fast bed design, and the flue gas velocity is 7-15m / s The gas reactor (4) adopts a bubbling bed design, and the flue gas velocity is between 1 and 3 m / s.

3. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 1 or 2, characterized in that: The first gas-solid separator (2) is in the form of two or more stages connected in series.

4. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 1 is characterized in that: The upper part of the coal gas reactor (4) is connected to the second gas-solid separator (7), the lower part of the second gas-solid separator (7) is connected to the second return valve (8), and the second return valve (8) is connected to the coal gas reactor (4).

5. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 4 is characterized in that: The first gas-solid separator (2) is a cyclone separator, and the first return valve (3) is a U-shaped return valve; the second gas-solid separator (7) is a cyclone separator, and the second return valve (8) is a U-shaped return valve.

6. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 1 is characterized in that: The invention also includes a sintering fume generating system (21), the sintering fume generating system (21) is connected to a dust collector (22), the dust collector (22) is connected to a booster fan (23), and the booster fan (23) is connected to the bottom wind chamber of the sintering fume reactor (1).

7. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 1 or 6, characterized in that: The system further comprises a blast furnace gas generating system (51), a converter gas generating system (52) and a coke oven gas generating system (53). The blast furnace gas generating system (51) passes through a first regulating damper (61), the converter gas generating system (52) passes through a second regulating damper (62), and the coke oven gas generating system (53) passes through a third regulating damper (63), and then are connected to the gas reactor (4) through a connecting flue (9).

8. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 1 is characterized in that: The top of the first gas-solid separator (2) is connected to the first steam generator (11), the first steam generator (11) is connected to the first flue gas purification device (12), and the first flue gas purification device (12) is connected to the chimney (13).

9. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 4, characterized in that: The top of the second gas-solid separator (7) is connected to the second steam generator (41), the second steam generator (41) is connected to the second flue gas purification device (42), and the second flue gas purification device (42) is connected to the CO2 purification device (43).

10. The chemical chain reaction system for collaboratively treating sintering flue gas and coal gas according to claim 9, characterized in that: The second flue gas purification device (42) is connected to the recirculation fan (31), and the recirculation fan (31) is connected to the bottom of the coal gas reactor (4).

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