Flue gas treatment system and use method

Abstract

The invention relates to a flue gas treatment system and a use method, and the flue gas treatment system comprises an industrial furnace which generates carbon monoxide with the concentration greater than 8,000 milligrams per cubic meter; the heat exchanger comprises a first inlet and a second inlet, the first inlet is communicated with the industrial furnace exhaust port, and the second inlet is communicated with the industrial furnace exhaust port; the first outlet is used for discharging the flue gas after heat is absorbed by a heat exchange structure in the heat exchanger; the second inlet is used for receiving the treated flue gas; the second outlet is used for discharging the flue gas subjected to heat exchange by the heat exchanger; the heat compensation furnace comprises a combustor, a heating device and a heating device; the third inlet is communicated with the first outlet and is used for receiving the flue gas; the heat compensation furnace has the beneficial effects that heating is conducted by means of circulating heat of heat of the heat compensation furnace, the energy utilization rate is high, equipment operation is stable, and after balance is established, continuous low-carbon and efficient operation can be achieved by adjusting the combustor.

Description

Technical Field

[0001] The present invention belongs to the field of flue gas treatment environmental protection equipment, and specifically relates to a flue gas treatment system and a use method. Background Art

[0002] Carbon monoxide is one of the atmospheric pollutants that participates in the formation of photochemical smog and reacts with other pollutants (such as nitrogen oxides and volatile organic compounds) to produce secondary pollutants such as ozone, further deteriorating air quality. Carbon monoxide not only poses a threat to human health, but also has a profound impact on air quality, climate change and ecosystems. Reducing carbon monoxide emissions, improving combustion efficiency, and strengthening air quality monitoring and management are the keys to improving air quality. The flue gas discharged from industrial furnaces contains CO at a concentration of approximately 8000mg / m 3 Environmental protection requirements require that the CO in flue gas be reduced to 2800 mg / m 3 the following.

[0003] The inventors discovered through research into existing technologies that CO treatment processes primarily involve: 1) placing a catalyst, typically a precious metal, in the flue gas duct to oxidize CO in the flue gas to CO₂ at relatively low temperatures. However, current catalysts have a short lifespan and high operating costs. 2) The RTO furnace process, which also involves direct oxidation at high temperatures, has the disadvantages of high initial investment, large footprint, complex equipment, and transient levels of pollutants in the flue gas exceeding permitted levels during the reversal process.

[0004] Therefore, there is an urgent need for a flue gas treatment system containing carbon monoxide that has a simple device structure and does not require catalysis or reversing. Summary of the Invention

[0005] Research and development found that low-concentration CO may ignite above 600°C and burn violently at 710°C. Therefore, by heating the flue gas containing carbon monoxide, it is promoted to burn or oxidize and convert into carbon dioxide, forming a technical solution that uses the waste heat after combustion to reheat the flue gas, thus overcoming the defects in the existing technology.

[0006] The technical solution adopted by the present invention is: a flue gas treatment system, comprising:

[0007] Industrial furnaces producing carbon monoxide at concentrations exceeding 8,000 mg / m3;

[0008] and a heat exchanger, the heat exchanger comprising:

[0009] a first inlet, connected to the exhaust port of the industrial furnace, receiving the flue gas containing carbon monoxide discharged from the industrial furnace;

[0010] A first outlet discharges the flue gas after absorbing heat through the internal heat exchange structure of the heat exchanger;

[0011] a second inlet for receiving the treated flue gas;

[0012] a second outlet for discharging the flue gas after heat exchange in the heat exchanger;

[0013] Furthermore, a supplementary heating furnace is included, wherein the supplementary heating furnace includes:

[0014] A burner for heating the gas inside the supplementary heating furnace;

[0015] a third inlet, connected to the first outlet, for receiving the flue gas;

[0016] The third outlet is connected to the second inlet and discharges the flue gas in the supplementary heating furnace.

[0017] Furthermore, the supplementary heating furnace further comprises:

[0018] A turbulent partition divides the supplementary heating furnace into a combustion chamber and a mixing chamber;

[0019] The burner is located in the combustion chamber;

[0020] A temperature measuring element is provided in the mixing chamber;

[0021] The second inlet is in communication with the combustion chamber, and the second outlet is in communication with the mixing chamber.

[0022] Further,

[0023] The burners are arranged in groups evenly spaced within the combustion chamber;

[0024] The temperature measuring elements are in multiple groups and are evenly spaced and arranged in the mixing chamber.

[0025] Further,

[0026] The time for the flue gas in the mixing chamber to travel from the third inlet to the mixing chamber is greater than or equal to two seconds.

[0027] Further,

[0028] The heat exchanger is a ceramic heat exchanger.

[0029] Furthermore, it also includes:

[0030] a waste heat utilization device, connected to the second outlet, for utilizing the heat of the flue gas for preheating;

[0031] The chimney receives the flue gas discharged by the waste heat utilization device and discharges it to the outside.

[0032] And, a method for using a flue gas treatment system, comprising: a flue gas treatment system, the flue gas treatment system comprising:

[0033] Industrial furnaces producing carbon monoxide at concentrations exceeding 8,000 mg / m3;

[0034] and a heat exchanger, the heat exchanger comprising:

[0035] a first inlet, connected to the exhaust port of the industrial furnace, receiving the flue gas containing carbon monoxide discharged from the industrial furnace;

[0036] A first outlet discharges the flue gas after absorbing heat through the internal heat exchange structure of the heat exchanger;

[0037] a second inlet for receiving the treated flue gas;

[0038] a second outlet for discharging the flue gas after heat exchange in the heat exchanger;

[0039] Furthermore, a supplementary heating furnace is included, wherein the supplementary heating furnace includes:

[0040] A burner, for heating the gas inside the supplementary heating furnace;

[0041] a third inlet, connected to the first outlet, for receiving the flue gas;

[0042] a third outlet, connected to the second inlet, for discharging the flue gas in the supplementary heating furnace;

[0043] The supplementary heat furnace also includes:

[0044] A turbulent partition divides the supplementary heating furnace into a combustion chamber and a mixing chamber;

[0045] The burner is located in the combustion chamber;

[0046] A temperature measuring element is provided in the mixing chamber;

[0047] The second inlet is in communication with the combustion chamber, and the second outlet is in communication with the mixing chamber;

[0048] The burners are arranged in groups evenly spaced within the combustion chamber;

[0049] The temperature measuring elements are multiple groups, evenly spaced and arranged in the mixing chamber;

[0050] Also includes:

[0051] a waste heat utilization device, connected to the second outlet, for utilizing the heat of the flue gas for preheating;

[0052] a chimney, receiving the flue gas discharged from the waste heat utilization device and discharging it to the outside;

[0053] And, also includes the following methods:

[0054] The industrial furnace discharges the flue gas with a temperature greater than 100 degrees Celsius;

[0055] The first inlet receives the flue gas;

[0056] The flue gas is heated in the heat exchanger;

[0057] The first outlet discharges the flue gas into the supplementary heating furnace, and heats the flue gas in the supplementary heating furnace;

[0058] The second inlet receives the heated flue gas discharged from the supplementary heating furnace;

[0059] The second outlet discharges the flue gas and heats the flue gas entering the first inlet by means of the heat exchange structure;

[0060] Repeat the above steps until the lowest temperature of the flue gas when it is discharged from the second outlet is greater than 800 degrees Celsius;

[0061] The temperature measuring element monitors the temperature discharged from the second outlet;

[0062] By adjusting the burner, the flue gas is controlled to be maintained at a temperature above 800 degrees Celsius at the second outlet;

[0063] The flue gas discharged from the second outlet is heated by the waste heat utilization device;

[0064] The flue gas after being utilized by the waste heat utilization device is discharged from the chimney.

[0065] Furthermore, the following method is also included:

[0066] monitoring the carbon monoxide concentration of the flue gas discharged from the chimney;

[0067] When the carbon monoxide concentration of the flue gas exceeds 2,800 mg / m3, increasing the number of burners operating;

[0068] Dynamically maintain the concentration of the flue gas when it is discharged from the chimney.

[0069] Furthermore, the following method is also included:

[0070] The lowest temperature of the plurality of temperature measuring elements is maintained at more than 800 degrees Celsius.

[0071] Furthermore, the following method is also included:

[0072] By adjusting the specifications of the heat exchanger, the temperature of the flue gas discharged from the second outlet is set above 200 degrees Celsius and below 300 degrees Celsius.

[0073] The beneficial effects of the present invention compared to the prior art are: the system uses its own circulating heat for heating, has high energy utilization, and stable equipment operation. After establishing a balance, the burner can be adjusted to achieve continuous low-carbon and efficient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0074] Figure 1 This is a schematic diagram of the system layout of a specific embodiment of the present invention;

[0075] Figure 2 This is a schematic structural diagram of a heat exchanger according to a specific embodiment of the present invention;

[0076] Figure 3 This is a structural schematic diagram of a supplementary heat furnace according to a specific embodiment of the present invention;

[0077] Figure 4 This is a schematic diagram of the top view of the supplementary heating furnace according to a specific embodiment of the present invention;

[0078] The markings are as follows: 1-industrial furnace; 2-heat exchanger; 21-first inlet; 22-first outlet; 23-second inlet; 24-second outlet;

[0079] 3-Supplementary heating furnace; 31-Third inlet; 32-Third outlet; 33-Burner; 34-Turbine partition; 35-Temperature measuring element;

[0080] 4-Waste heat utilization device; 5-Chimney. DETAILED DESCRIPTION

[0081] The technical solutions in the embodiments are clearly and completely described. Obviously, the embodiments described are only a part of the embodiments of the present invention, rather than all the embodiments. In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0082] Low concentrations of CO may ignite above 600°C and burn violently at 710°C. Therefore, by heating the flue gas containing carbon monoxide, it is promoted to burn or oxidize and convert into carbon dioxide, forming a set of technical solutions that utilize the waste heat after combustion to reheat the flue gas, thus overcoming the defects of the existing technology. Figures 1 to 4 , the specific implementation is: a flue gas treatment system, including:

[0083] Industrial furnaces1 producing carbon monoxide at a concentration greater than 8,000 mg / m3;

[0084] And, heat exchanger 2, in actual application, sheet or tubular heat exchangers can be used as long as they meet the heat exchange requirements, but it should be noted that the concept of the invention is to heat carbon monoxide, then ignite it to release heat, form high-temperature flue gas, and then reversely heat the incoming flue gas to always keep the flue gas temperature entering the treatment device greater than 710 degrees Celsius. Usually, it is required to be greater than 900 degrees Celsius in the design, so this has requirements for the heat exchange capacity of heat exchanger 2. Generally, large heat exchange components are required to meet the heat exchange requirements of the flue gas, and gradually form a process in which the incoming flue gas temperature is heated by the returning flue gas to a temperature that allows combustion. The heat of the returned flue gas after the outlet is low and can be used as waste heat. The dynamic balance of the above cycle, the heat lost in the middle is supplemented by the burner 33.

[0085] See also Figure 2 , the heat exchanger 2 comprises:

[0086] The first inlet 21 is connected to the exhaust port of the industrial furnace 1 and receives the flue gas containing carbon monoxide discharged from the industrial furnace 1;

[0087] The first outlet 22 discharges the flue gas after absorbing heat through the internal heat exchange structure of the heat exchanger 2;

[0088] The second inlet 23 receives the treated flue gas;

[0089] The second outlet 24 discharges the flue gas after heat exchange in the heat exchanger 2;

[0090] Also, see Figure 3 and Figure 4 , further comprising a supplementary heat furnace 3, wherein the supplementary heat furnace 3 comprises:

[0091] The burner 33 heats the gas inside the supplementary heating furnace 3;

[0092] a third inlet 31, connected to the first outlet 22, for receiving the flue gas;

[0093] The third outlet 32 ​​is connected to the second inlet 23 to discharge the flue gas in the supplementary heat furnace 3. The above technical solution forms a basic component that allows circulation, which can realize the treatment and heat utilization of flue gas.

[0094] In some other embodiments, preferably, the supplementary heat furnace 3 further includes:

[0095] The turbulent partition 34 divides the supplementary heating furnace 3 into a combustion chamber and a mixing chamber. Since flue gas heating requires a large space, usually more than 10,000 cubic meters, and the burners 33 are usually arranged on the peripheral side, the flue gas in the middle may not be ignited and oxidized into carbon dioxide. In order to avoid the emission of such high-concentration carbon monoxide flue gas, mixing is required at the end of the processing equipment to neutralize the concentration.

[0096] The burner 33 is located in the combustion chamber;

[0097] A temperature measuring element 35 is provided in the mixing chamber; the temperature measuring element 35 is one of the important components of the system for controlling the flue gas circulation, and the temperature needs to be continuously monitored to determine whether the flue gas is oxidized or ignited.

[0098] The second inlet 23 is in communication with the combustion chamber, and the second outlet 24 is in communication with the mixing chamber.

[0099] In the embodiment, in order to improve the conversion efficiency and the reliability of the system, preferably,

[0100] The burners 33 are arranged in groups and spaced evenly within the combustion chamber;

[0101] The temperature measuring elements 35 are in multiple groups and are evenly spaced apart and arranged in the mixing chamber.

[0102] In other embodiments, in order to ensure the treatment of flue gas, preferably,

[0103] The time it takes for the flue gas in the mixing chamber to travel from the third inlet 31 to the mixing chamber is greater than or equal to two seconds. This requires extending the length or space of the mixing chamber. Since the flow rate of the flue gas entering the mixing chamber is generally not fast, it can be ensured that the flue gas is ignited or oxidized.

[0104] In other embodiments, since the heat exchange temperature is higher than 800 degrees Celsius, preferably,

[0105] The heat exchanger 2 is a ceramic heat exchanger.

[0106] In other embodiments, see Figure 1 , also includes:

[0107] The waste heat utilization device 4 is connected to the second outlet 24 and uses the heat of the flue gas for preheating;

[0108] The chimney 5 receives the flue gas discharged by the waste heat utilization device 4 and discharges it to the outside. The heat of the flue gas is fully utilized to convert the temperature of other parts that need to be preheated, such as preheating scrap steel and preheating zinc ingots.

[0109] At the same time, the usage of this system is also designed as follows:

[0110] A method for using a flue gas treatment system, comprising: a flue gas treatment system, the flue gas treatment system comprising:

[0111] Industrial furnaces1 producing carbon monoxide at a concentration greater than 8,000 mg / m3;

[0112] And, a heat exchanger 2, the heat exchanger 2 comprising:

[0113] The first inlet 21 is connected to the exhaust port of the industrial furnace 1 and receives the flue gas containing carbon monoxide discharged from the industrial furnace 1;

[0114] The first outlet 22 discharges the flue gas after absorbing heat through the internal heat exchange structure of the heat exchanger 2;

[0115] The second inlet 23 receives the treated flue gas;

[0116] The second outlet 24 discharges the flue gas after heat exchange in the heat exchanger 2;

[0117] Furthermore, a supplementary heat furnace 3 is included, and the supplementary heat furnace 3 includes:

[0118] The burner 33 heats the gas inside the supplementary heating furnace 3;

[0119] a third inlet 31, connected to the first outlet 22, for receiving the flue gas;

[0120] The third outlet 32 ​​is connected to the second inlet 23 and discharges the flue gas in the supplementary heating furnace 3;

[0121] The supplementary heat furnace 3 also includes:

[0122] A turbulent partition 34 divides the supplementary heating furnace 3 into a combustion chamber and a mixing chamber;

[0123] The burner 33 is located in the combustion chamber;

[0124] A temperature measuring element 35 is provided in the mixing chamber;

[0125] The second inlet 23 is in communication with the combustion chamber, and the second outlet 24 is in communication with the mixing chamber;

[0126] The burners 33 are arranged in groups and spaced evenly within the combustion chamber;

[0127] The temperature measuring elements 35 are multiple groups, evenly spaced and arranged in the mixing chamber;

[0128] Also includes:

[0129] The waste heat utilization device 4 is connected to the second outlet 24 and uses the heat of the flue gas for preheating;

[0130] a chimney 5 for receiving the flue gas discharged from the waste heat utilization device 4 and discharging the flue gas to the outside;

[0131] And, also includes the following methods:

[0132] The industrial furnace 1 discharges the flue gas with a temperature greater than 100 degrees Celsius;

[0133] The first inlet 21 receives the flue gas;

[0134] The flue gas is heated in the heat exchanger 2;

[0135] The first outlet 22 discharges the flue gas into the supplementary heating furnace 3 and heats the flue gas in the supplementary heating furnace 3;

[0136] The second inlet 23 receives the heated flue gas discharged from the supplementary heating furnace 3;

[0137] The second outlet 24 discharges the flue gas and heats the flue gas entering the first inlet 21 by means of the heat exchange structure;

[0138] Repeat the above steps until the lowest temperature of the flue gas when it is discharged from the second outlet 24 is greater than 800 degrees Celsius;

[0139] The above steps gradually form a thermal cycle during the initial flue gas entry. For example, if the initial flue gas temperature is 150 degrees Celsius, the efficiency of the burner 33 can be improved, heating the flue gas to a set temperature of 400 degrees Celsius. Then, in the heat exchanger 2, the heat of this 400-degree flue gas heats the subsequent flue gas, raising it from the initial 150 degrees Celsius to 250 degrees Celsius. This cycle gradually forms a balance, reaching a flue gas temperature of 150 degrees Celsius. When entering the supplementary heat furnace 3, the flue gas temperature is close to 800 degrees Celsius. Through combustion, the flue gas temperature approaches 900 degrees Celsius. This flue gas returns to the heat exchanger 2 to heat the subsequent flue gas, reheating it to nearly 800 degrees Celsius. The flue gas discharged from the heat exchanger 2 is then controlled at 200 to 300 degrees Celsius. This forms a heat conservation principle, with the lost heat being replenished by the burner 33.

[0140] The temperature measuring element 35 monitors the temperature discharged from the second outlet 24;

[0141] By adjusting the burner 33, the flue gas is controlled to be maintained at a temperature above 800 degrees Celsius at the second outlet 24;

[0142] The flue gas discharged from the second outlet 24 is heated by the waste heat utilization device 4;

[0143] The flue gas utilized by the waste heat utilization device 4 is discharged from the chimney 5 .

[0144] In other embodiments, in order to dynamically control the concentration of carbon monoxide in the flue gas, multiple groups of burners 33 are provided and the number of burners 33 working is controlled, which also includes the following methods:

[0145] monitoring the carbon monoxide concentration of the flue gas discharged from the chimney 5;

[0146] When the carbon monoxide concentration of the flue gas exceeds 2,800 mg / m3, the number of burners 33 operating is increased;

[0147] The concentration of the flue gas when discharged from the chimney 5 is dynamically maintained.

[0148] In some embodiments, preferably, in order to ensure that the concentration of carbon monoxide after treatment meets the requirements, the following method is also included:

[0149] The lowest temperature of the plurality of temperature measuring elements 35 is maintained to be above 800 degrees Celsius.

[0150] In some embodiments, preferably yours, in order to ensure dynamic balance, it is necessary to add a temperature control device at the end of the heat exchanger 2 to control the exchange efficiency of the heat exchanger 2 to form an optimal energy balance point, and also include the following methods:

[0151] By adjusting the specifications of the heat exchanger 2, the temperature of the flue gas discharged from the second outlet 24 is set to be above 200 degrees Celsius and below 300 degrees Celsius.

[0152] During specific operation, flue gas discharged from industrial furnace 1, with a temperature not exceeding 200°C and a carbon monoxide concentration greater than 8,000 mg / m3, is heated by heat exchanger 2 to a temperature of 700-800°C before entering supplemental heating furnace 3. Burner 33 in supplemental heating furnace 3 ignites and oxidizes carbon monoxide into carbon dioxide. Temperature measuring element 35 ensures that the flue gas temperature is above 800°C. At this point, the flue gas returns to heat exchanger 2, heating the incoming flue gas. The exhaust flue gas reaches a terminal temperature between 200°C and 300°C, effectively heating the incoming flue gas. The initially treated flue gas then heats the incoming flue gas before entering supplemental heating furnace 3, forming a reverse cycle heating path that meets the required flue gas heating requirements. The exhausted flue gas can then be utilized by waste heat recovery device 4 before being discharged through chimney 5.

[0153] The beneficial effects are: this system utilizes its own circulating heat for heating, resulting in high energy utilization and stable equipment operation. After establishing equilibrium, the burner can be adjusted to achieve continuous low-carbon and high-efficiency operation. It avoids the use of catalysts or reversing processes, achieving efficient heat exchange and carbon monoxide treatment.

[0154] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A flue gas treatment system, characterized in that: include: Industrial furnaces (1) producing carbon monoxide at a concentration greater than 8,000 mg / m3; and a heat exchanger (2), the heat exchanger (2) comprising: A first inlet (21) is connected to the exhaust port of the industrial furnace (1) and receives the flue gas containing carbon monoxide discharged from the industrial furnace (1); a first outlet (22) for discharging the flue gas after absorbing heat through the internal heat exchange structure of the heat exchanger (2); a second inlet (23) for receiving the treated flue gas; a second outlet (24) for discharging the flue gas after heat exchange in the heat exchanger (2); Furthermore, it also includes a supplementary heating furnace (3), wherein the supplementary heating furnace (3) includes: A burner (33) for heating the gas inside the supplementary heating furnace (3); a third inlet (31), connected to the first outlet (22), for receiving the flue gas; The third outlet (32) is connected to the second inlet (23) to discharge the smoke in the supplementary heating furnace (3).

2. The flue gas treatment system according to claim 1, characterized in that: The supplementary heat furnace (3) further comprises: A turbulent partition (34) divides the supplementary heating furnace (3) into a combustion chamber and a mixing chamber; The burner (33) is located in the combustion chamber; A temperature measuring element (35) is provided in the mixing chamber; The second inlet (23) is in communication with the combustion chamber, and the second outlet (24) is in communication with the mixing chamber.

3. The flue gas treatment system according to claim 2, characterized in that: The burners (33) are arranged in groups evenly spaced apart in the combustion chamber; The temperature measuring elements (35) are in multiple groups and are evenly spaced and arranged in the mixing chamber.

4. The flue gas treatment system according to claim 2, characterized in that: The time for the flue gas in the mixing chamber to travel from the third inlet (31) to the mixing chamber is greater than or equal to two seconds.

5. The flue gas treatment system according to claim 1, characterized in that: The heat exchanger (2) is a ceramic heat exchanger.

6. The flue gas treatment system according to any of claims 1-5, characterized in that: Also includes: a waste heat utilization device (4), connected to the second outlet (24), for preheating by utilizing the heat of the flue gas; The chimney (5) receives the flue gas discharged from the waste heat utilization device (4) and discharges it to the outside.

7. A method for using a flue gas treatment system, characterized in that: include: A flue gas treatment system, comprising: Industrial furnaces (1) producing carbon monoxide at a concentration greater than 8,000 mg / m3; and a heat exchanger (2), the heat exchanger (2) comprising: A first inlet (21) is connected to the exhaust port of the industrial furnace (1) and receives the flue gas containing carbon monoxide discharged from the industrial furnace (1); a first outlet (22) for discharging the flue gas after absorbing heat through the internal heat exchange structure of the heat exchanger (2); a second inlet (23) for receiving the treated flue gas; a second outlet (24) for discharging the flue gas after heat exchange in the heat exchanger (2); Furthermore, it further comprises a supplementary heating furnace (3), wherein the supplementary heating furnace (3) comprises: A burner (33) for heating the gas inside the supplementary heating furnace (3); a third inlet (31), connected to the first outlet (22), for receiving the flue gas; a third outlet (32) communicating with the second inlet (23) for discharging smoke from the supplementary heating furnace (3); The supplementary heat furnace (3) further comprises: A turbulent partition (34) divides the supplementary heating furnace (3) into a combustion chamber and a mixing chamber; The burner (33) is located in the combustion chamber; A temperature measuring element (35) is provided in the mixing chamber; The second inlet (23) is in communication with the combustion chamber, and the second outlet (24) is in communication with the mixing chamber; The burners (33) are arranged in groups evenly spaced apart in the combustion chamber; The temperature measuring elements (35) are in multiple groups and are evenly spaced and arranged in the mixing chamber; Also includes: a waste heat utilization device (4), connected to the second outlet (24), for preheating by utilizing the heat of the flue gas; a chimney (5) for receiving the flue gas discharged from the waste heat utilization device (4) and discharging the flue gas to the outside; And, also includes the following methods: The industrial furnace (1) discharges the flue gas with a temperature greater than 100 degrees Celsius; The first inlet (21) receives the flue gas; The flue gas is heated in the heat exchanger (2); The first outlet (22) discharges the flue gas into the supplementary heating furnace (3), and heats the flue gas in the supplementary heating furnace (3); The second inlet (23) receives the heated flue gas discharged from the supplementary heating furnace (3); The second outlet (24) discharges the flue gas and heats the flue gas entering through the first inlet (21) by means of the heat exchange structure; Repeat the above steps until the lowest temperature of the smoke when it is discharged from the second outlet (24) is greater than 800 degrees Celsius; The temperature measuring element (35) monitors the temperature discharged from the second outlet (24); By adjusting the burner (33), the flue gas is controlled to be maintained at a temperature above 800 degrees Celsius at the second outlet (24); The flue gas discharged from the second outlet (24) is heated by the waste heat utilization device (4); The flue gas utilized by the waste heat utilization device (4) is discharged from the chimney (5).

8. The method for using the flue gas treatment system according to claim 7, characterized in that: Also includes the following methods: monitoring the carbon monoxide concentration of the flue gas discharged from the chimney (5); When the carbon monoxide concentration of the flue gas exceeds 2,800 mg / m3, increasing the number of operations of the burner (33); Dynamically maintain the concentration of the flue gas when it is discharged from the chimney (5).

9. The method for using the flue gas treatment system according to claim 7, characterized in that: Also includes the following methods: The lowest temperature of the plurality of temperature measuring elements (35) is maintained to be above 800 degrees Celsius.

10. The method for using the flue gas treatment system according to claim 7, characterized in that: Also includes the following methods: By adjusting the specifications of the heat exchanger (2), the temperature of the flue gas discharged from the second outlet (24) is set above 200 degrees Celsius and below 300 degrees Celsius.

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