Flue gas quenching device

Abstract

The present invention discloses a flue gas quenching device, which comprises an air intake pipe, a wet quenching tower, an atomizing nozzle and a heat exchanger, wherein the air intake pipe is provided with an air intake, a first air outlet and a second air outlet, the wet quenching tower comprises a tower body, a chamber is provided in the tower body, the wet quenching tower is connected to the air intake pipe to connect the chamber and the first air outlet, the atomizing nozzle is provided on the tower body for spraying atomized water into the chamber, the high-temperature flue gas in the chamber is suitable for heat exchange with the atomized water, the heat exchanger is provided with a first inlet and a first outlet, and the cooling medium is suitable for entering the interior of the heat exchanger through the first inlet and flowing out of the heat exchanger from the first outlet. The flue gas quenching device of the present invention has the characteristics of simple structure, small footprint, high-efficiency cooling, effective use of flue gas sensible heat and reduction of water content of outlet flue gas.

Description

Technical Field

[0001] The invention relates to the technical field of flue gas cooling, and in particular to a flue gas rapid cooling device. Background Art

[0002] Waste residue, dust, sludge and other solid wastes generated in the industrial production process are currently mainly reduced and harmlessly disposed of by thermal treatment methods such as incineration and smelting. The high-temperature flue gas generated during the thermal treatment process needs to be treated with a rapid cooling device to inhibit the generation of harmful substances such as dioxins.

[0003] At present, the quenching tower mainly adopts the gas-liquid heat exchange method, spraying atomized water through the spray gun on the top of the tower, fully contacting with the high-temperature flue gas, and the atomized water reaches the saturation temperature instantly and evaporates, and the temperature of the high-temperature flue gas drops sharply to below 200°C, and finally discharged from the bottom of the quenching tower together with water vapor. This method can effectively cool the high-temperature flue gas rapidly, but the sensible heat of the high-temperature flue gas is not fully utilized. At the same time, the water content of the flue gas from the thermal treatment of industrial solid waste is high (the initial water content can reach more than 30%). After passing through the quenching tower, the water content of the flue gas can reach more than 40%. This high-water content flue gas is very easy to condense, causing the subsequent bag filter to stick. In addition, the sulfur, chlorine, fluorine and other acidic substances contained in the flue gas will also cause the quenching tower and subsequent environmental protection equipment to corrode due to flue gas condensation. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes a flue gas quenching device that has high efficiency in cooling, recovers sensible heat, has a simple structure, and is safe and reliable.

[0006] The flue gas quenching device according to an embodiment of the present invention comprises an air inlet duct, a wet quenching tower, an atomizing nozzle and a heat exchanger, wherein the air inlet duct is provided with an air inlet, a first air outlet and a second air outlet, and high-temperature flue gas is suitable for entering the air inlet duct through the air inlet and flowing out of the air inlet duct from the first air outlet and the second air outlet; the wet quenching tower comprises a tower body, a chamber is provided in the tower body, the wet quenching tower is connected to the air inlet duct to connect the chamber and the first air outlet, and the high-temperature flue gas flowing out of the first air outlet is suitable for entering the chamber ; The atomizing nozzle is arranged on the tower body to spray atomized water into the chamber, and the high-temperature flue gas in the chamber is suitable for heat exchange with the atomized water; the heat exchanger is provided with a first inlet and a first outlet, and the cooling medium is suitable for entering the interior of the heat exchanger through the first inlet and flowing out of the heat exchanger from the first outlet, and the heat exchanger is connected to the air inlet pipe to connect the interior of the heat exchanger and the second air outlet, and the high-temperature flue gas flowing out of the second air outlet is suitable for entering the interior of the heat exchanger and exchanging heat with the cooling medium inside the heat exchanger.

[0007] According to the flue gas quenching device of the embodiment of the present invention, the high-temperature flue gas is cooled simultaneously by a wet quenching tower and a heat exchanger, and the structure is simple, and the temperature can be reduced quickly. At the same time, because part of the high-temperature flue gas enters the heat exchanger for cooling, the water consumption of the wet quenching tower for cooling is reduced, and the water content of the exhaust flue gas is effectively reduced. The heat exchanger can use the cooling medium to exchange heat with the high-temperature flue gas, and effectively absorb sensible heat. Moreover, the flue gas quenching device of the embodiment of the present invention occupies a small area and can be flexibly arranged, which is conducive to the placement of subsequent facilities.

[0008] In some embodiments, the flue gas rapid cooling device also includes an air outlet pipe, which includes a first air outlet pipe and a second air outlet pipe, the first air outlet pipe is connected to the tower body to connect the interior of the first air outlet pipe and the chamber, the first air outlet pipe is suitable for discharging the flue gas after heat exchange with the atomized water from the chamber, the second air outlet pipe is connected to the heat exchanger to connect the interior of the second air outlet pipe and the interior of the heat exchanger, and the second air outlet pipe is suitable for discharging the flue gas after heat exchange with the cooling medium from the interior of the heat exchanger.

[0009] In some embodiments, the air outlet pipe further includes a first connecting pipe, and the first connecting pipe is respectively connected to the first air outlet pipe and the second air outlet pipe to connect the first air outlet pipe and the second air outlet pipe.

[0010] In some embodiments, the heat exchanger is disposed adjacent to the top of the tower body in the up-down direction, the second gas outlet pipe is located above the first gas outlet pipe, and at least a portion of the first gas outlet pipe extends upward from the lower end of the tower body.

[0011] In some embodiments, an extension direction of the first air outlet pipe forms an angle with a length direction of the tower body.

[0012] In some embodiments, the heat exchanger is further provided with a second inlet and a second outlet, the second inlet is communicated with the second air outlet, and the interior of the heat exchanger is communicated with the interior of the second air outlet pipe through the second outlet.

[0013] In some embodiments, the flue gas quenching device further includes a second connecting pipe, and the second connecting pipe is connected to the air inlet pipe and the heat exchanger to connect the second air outlet and the second inlet.

[0014] In some embodiments, the flue gas rapid cooling device further includes a regulating valve, which is disposed in the second connecting pipe and is used to control the amount of high-temperature flue gas flowing out of the second air outlet.

[0015] In some embodiments, the tower body includes a conical section, a cylindrical section and an inverted conical section connected in sequence from top to bottom, the upper end of the conical section is connected to the air inlet pipe, and the atomizing nozzle is arranged in the conical section.

[0016] In some embodiments, the wet quench tower and the air inlet duct are both made of corrosion-resistant materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the main view of the flue gas quenching device structure.

[0018] Figure 2 It is a top view of the structure of the flue gas quenching device.

[0019] Figure 3 It is a schematic diagram of the structure of a rotary heat exchanger.

[0020] Reference numerals:

[0021] Inlet pipe 1, air inlet 11, first air outlet 12, second air outlet 13, wet quenching tower 2, tower body 21, chamber 22, conical section 23, cylindrical section 24, inverted conical section 25, atomizing nozzle 3, heat exchanger 4, first inlet 41, first outlet 42, second inlet 43, second outlet 44, outlet pipe 5, first outlet pipe 51, second outlet pipe 52, first connecting pipe 53, second connecting pipe 6, regulating valve 7. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0023] The following describes a flue gas quenching device according to an embodiment of the present invention with reference to the accompanying drawings.

[0024] like Figure 1-3 As shown, the flue gas quenching device according to an embodiment of the present invention includes: an air inlet duct 1, a wet quenching tower 2, an atomizing nozzle 3 and a heat exchanger 4.

[0025] The air intake duct 1 is provided with an air intake port 11 , a first air outlet 12 and a second air outlet 13 . High temperature flue gas is suitable for entering the air intake duct 1 through the air intake port 11 and flowing out of the air intake duct 1 from the first air outlet 12 and the second air outlet 13 .

[0026] The wet quenching tower 2 includes a tower body 21, and a chamber 22 is provided in the tower body 21. The wet quenching tower 2 is connected to the air inlet pipe 1 to connect the chamber 22 and the first air outlet 12. The high-temperature flue gas flowing out of the first air outlet 12 is suitable for entering the chamber 22. The atomizing nozzle 3 is arranged on the tower body 21 for spraying atomized water into the chamber 22. The high-temperature flue gas in the chamber 22 is suitable for heat exchange with the atomized water.

[0027] The heat exchanger 4 is provided with a first inlet 41 and a first outlet 42, and the cooling medium is suitable for entering the interior of the heat exchanger 4 through the first inlet 41 and flowing out of the heat exchanger 4 from the first outlet 42. The heat exchanger 4 is connected to the air inlet duct 1 to communicate with the interior of the heat exchanger 4 and the second air outlet 13, and the high-temperature flue gas flowing out of the second air outlet 13 is suitable for entering the interior of the heat exchanger 4 and performing heat exchange with the cooling medium in the heat exchanger 4.

[0028] In other words, the high-temperature flue gas enters the air inlet 1 through the air inlet 11 and flows out of the air inlet 1 from the first air outlet 12 and the second air outlet 13. The high-temperature flue gas flowing out of the first air outlet 12 enters the tower body 21 of the wet quenching tower 2, and is cooled by heat exchange with the atomized water sprayed from the atomizing nozzle 3; the high-temperature flue gas flowing out of the second air outlet 13 enters the inside of the heat exchanger 4, and is cooled by heat exchange with the cooling medium inside the heat exchanger 4. The high-temperature flue gas enters the wet quenching tower 2 and the heat exchanger 4 at the same time for cooling, which is more efficient.

[0029] According to the flue gas quenching device of the embodiment of the present invention, the wet quenching tower 2 and the heat exchanger 4 cool down the high-temperature flue gas at the same time, the structure is simple, and the temperature can be quickly reduced. At the same time, because part of the high-temperature flue gas enters the heat exchanger 4 for cooling, the water consumption of the wet quenching tower 2 for cooling is reduced, and the water content of the exhaust flue gas is effectively reduced. The heat exchanger 4 can use the cooling medium to exchange heat with the high-temperature flue gas and effectively absorb sensible heat. Moreover, the flue gas quenching device of the embodiment of the present invention occupies a small area and can be flexibly arranged, which is conducive to the placement of subsequent facilities.

[0030] In some embodiments, the flue gas quenching device further includes an air outlet pipe 5, and the air outlet pipe 5 includes a first air outlet pipe 51 and a second air outlet pipe 52. The first air outlet pipe 51 is connected to the tower body 21 to connect the interior of the first air outlet pipe 51 and the chamber 22, and the first air outlet pipe 51 is suitable for discharging the flue gas after heat exchange with the atomized water from the chamber 22. The second air outlet pipe 52 is connected to the heat exchanger 4 to connect the interior of the second air outlet pipe 52 and the interior of the heat exchanger 4, and the second air outlet pipe 52 is suitable for discharging the flue gas after heat exchange with the cooling medium from the interior of the heat exchanger 4.

[0031] The first gas outlet duct 51 and the second gas outlet duct 52 can quickly discharge the smoke after heat exchange from the chamber 22 and the inside of the heat exchanger 4, and at the same time prevent the smoke from escaping and causing pollution to the environment.

[0032] In some embodiments, the gas outlet pipe 5 further includes a first connecting pipe 53 , which is connected to the first gas outlet pipe 51 and the second gas outlet pipe 52 respectively to connect the first gas outlet pipe 51 and the second gas outlet pipe 52 .

[0033] The first connecting pipe 53 integrates the first gas outlet pipe 51 and the second gas outlet pipe 52 into the same pipe, which is convenient for the operation of subsequent processes and can increase the exhaust speed of smoke.

[0034] In some embodiments, the heat exchanger 4 is disposed adjacent to the top of the tower body 21 in the up-down direction, the second gas outlet pipe 52 is located above the first gas outlet pipe 51 , and at least a portion of the first gas outlet pipe 51 extends upward from the lower end of the tower body 21 .

[0035] The high-temperature flue gas flows from top to bottom in the heat exchanger 4, and exchanges heat with the cooling medium flowing from bottom to top in the heat exchanger 4, which can effectively utilize the sensible heat of the high-temperature flue gas. The cooled flue gas is discharged through the second air outlet pipe 52. After the high-temperature flue gas is fully in contact with the atomized water sprayed from the atomizing nozzle 3 in the tower body 21, the cooled flue gas and the water vapor formed by the atomized water are discharged from the first air outlet pipe 51 at the same time. At least part of the first air outlet pipe 51 extends upward from the lower end of the tower body 21, so that part of the water vapor can condense on the inner wall of the pipe, thereby reducing the water content of the flue gas.

[0036] In some embodiments, an extending direction of the first air outlet pipe 51 forms an angle with a length direction of the tower body 21 .

[0037] The first air outlet pipe 51 extends obliquely upward, and the extension direction is V-shaped with the length direction of the tower body 21. The inclination angle of the first air outlet pipe 51 can prevent dust accumulation in the pipe and allow liquid formed by condensation on the inner wall of the pipe to flow downward to avoid adhesion with the dust to block the pipe.

[0038] In some embodiments, the heat exchanger 4 is further provided with a second inlet 43 and a second outlet 44. The second inlet 43 is connected to the second air outlet 13. The interior of the heat exchanger 4 is connected to the interior of the second air outlet pipe 52 through the second outlet 44. After the high-temperature flue gas flows out from the second air outlet 13, it enters the heat exchanger 4 from the second inlet 43 and exchanges heat with the cooling medium in the heat exchanger 4. The cooled flue gas flows out from the second outlet 44 and is discharged from the heat exchanger 4 from the second air outlet pipe 52.

[0039] like Figure 3 As shown, the high-temperature flue gas flowing out from the second air outlet 13 enters the heat exchanger 4 from top to bottom through the second inlet 43, exchanges heat with the cooling medium flowing from bottom to top in the heat exchanger 4, and then flows out from the second outlet 44. The cooling medium enters the heat exchanger 4 from bottom to top through the first inlet 41, exchanges heat with the high-temperature flue gas, and then the heated cooling medium flows out from the first outlet 42 for other uses.

[0040] In some embodiments, the flue gas quenching device further includes a second connecting pipe 6, which is connected to the air intake pipe 1 and the heat exchanger 4 to communicate with the second air outlet 13 and the second inlet 43. The second connecting pipe 6 connects the air intake pipe 1 and the heat exchanger 4, so that the high-temperature flue gas flows from the air intake pipe 1 into the heat exchanger 4.

[0041] In some embodiments, the flue gas quenching device further includes a regulating valve 7 , which is disposed in the second connecting pipe 6 and is used to control the amount of high-temperature flue gas flowing out of the second gas outlet 13 .

[0042] The flue gas quenching device of this embodiment can control the amount of high-temperature flue gas entering the heat exchanger 4 by adjusting the opening and closing degree of the regulating valve 7.

[0043] In some embodiments, the tower body 21 includes a conical section 23, a cylindrical section 24 and an inverted conical section 2523 connected in sequence from top to bottom, the upper end of the conical section 23 is connected to the air inlet pipe 1, and the atomizing nozzle 3 is arranged in the conical section 23. The inverted conical section 2523 is provided with an ash hopper (not shown in the drawings), which is used to collect fly ash entrained in the flue gas in the wet quenching tower 2, and the first air outlet pipe 51 is connected from the inverted conical section 2523 and extends upward to be connected to the first connecting pipe 53.

[0044] In some embodiments, the wet quench tower 2 and the air inlet duct 1 are both made of corrosion-resistant materials to avoid corrosion caused by condensation of flue gas.

[0045] Reference below Figure 1-3 The flue gas quenching devices according to some specific examples of the present invention are described.

[0046] like Figure 1-3As shown, the flue gas quenching device according to an embodiment of the present invention includes an air inlet pipe 1, a wet quenching tower 2, an atomizing nozzle 3, a heat exchanger 4 and an air outlet pipe 5.

[0047] The air inlet duct 1 includes an air inlet 11, a first air outlet 12 and a second air outlet 13. High-temperature flue gas enters the air inlet duct 1 through the air inlet 11 and flows out of the air inlet duct 1 from the first air outlet 12 and the second air outlet 13. The air outlet duct 5 includes a first air outlet duct 51, a second air outlet duct 52 and a first connecting duct 53.

[0048] The wet quenching tower 2 includes a tower body 21, such as Figure 1 As shown, the tower body 21 is connected from top to bottom with the conical section 23, the cylindrical section 24 and the inverted conical section 2523 in sequence, and the upper end of the conical section 23 is connected to the air inlet pipe 1, so that the chamber 22 in the tower body 21 is connected to the first air outlet 12, and the high-temperature flue gas flowing out of the first air outlet 12 enters the chamber 22. The conical section 23 is provided with an atomizing nozzle 3, and the atomizing nozzle 3 sprays atomized water into the chamber 22, and the high-temperature flue gas entering the chamber 22 performs heat exchange with the atomized water. An ash hopper (not shown) for collecting fly ash entrained in the flue gas is provided at the bottom of the inverted conical section 2523 of the tower body 21. The ash hopper is connected to the first air outlet pipe 51. The first air outlet pipe 51 extends obliquely upward, and the extension direction is V-shaped with the length direction of the tower body 21. The cooled flue gas condenses in the first air outlet pipe 51 and then flows downward to the bottom of the tower body 21. The first air outlet pipe 51 extends to the first connecting pipe 53 and is connected to the first connecting pipe 53.

[0049] The heat exchanger 4 is disposed adjacent to the top of the tower body 21 in the vertical direction. Figure 2 As shown, a second connecting pipe 6 is further provided between the heat exchanger 4 and the air inlet pipe, and the second connecting pipe 6 is connected to the air inlet pipe 1 and the heat exchanger 4 to communicate with the second air outlet 13 and the second inlet 43. A regulating valve 7 is provided in the second connecting pipe 6, and the amount of high-temperature flue gas entering the heat exchanger 4 can be controlled by adjusting the opening and closing degree of the regulating valve 7.

[0050] The heat exchanger 4 is provided with a first inlet 41, a first outlet 42, a second inlet 43 and a second outlet 44. Figure 3 As shown, the cooling medium enters the heat exchanger 4 from bottom to top through the first inlet 41 and flows out of the heat exchanger 4 from the first outlet 42. The high-temperature flue gas enters the air inlet duct 1 through the air inlet 11 and flows out of the air inlet duct 1 from the second air outlet 13. It enters the heat exchanger 4 from top to bottom through the second inlet 43. The high-temperature flue gas exchanges heat with the cooling medium inside the heat exchanger 4. The cooled flue gas is discharged into the second air outlet duct 52 through the second outlet 44. Figure 1As shown, the second air outlet pipe 52 extends downward and is connected to the first connecting pipe 53. The first connecting pipe 53 integrates the first air outlet pipe 51 and the second air outlet pipe 52 into the same pipe, which is convenient for the operation of subsequent processes and can increase the smoke exhaust speed.

[0051] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0052] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0055] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0056] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A flue gas quenching device, characterized in that: include: An air inlet duct, wherein the air inlet duct is provided with an air inlet, a first air outlet, and a second air outlet, and high-temperature flue gas is suitable for entering the air inlet duct through the air inlet and flowing out of the air inlet duct from the first air outlet and the second air outlet; A wet quenching tower, the wet quenching tower comprising a tower body, the tower body having a chamber, the wet quenching tower being connected to the air inlet duct to connect the chamber and the first air outlet, and the high-temperature flue gas flowing out of the first air outlet is suitable for entering the chamber; an atomizing nozzle, the atomizing nozzle being arranged on the tower body and used for spraying atomized water into the chamber, and the high-temperature flue gas in the chamber is suitable for heat exchange with the atomized water; A heat exchanger, wherein the heat exchanger is provided with a first inlet and a first outlet, wherein a cooling medium is adapted to enter the interior of the heat exchanger through the first inlet and flow out of the heat exchanger from the first outlet, wherein the heat exchanger is connected to the air inlet duct to communicate the interior of the heat exchanger and the second air outlet, wherein the high-temperature flue gas flowing out of the second air outlet is adapted to enter the interior of the heat exchanger and perform heat exchange with the cooling medium in the heat exchanger; The tower body comprises a conical section, a cylindrical section and an inverted conical section which are sequentially connected from top to bottom, the upper end of the conical section is connected to the air intake pipe, and the atomizing nozzle is arranged in the conical section; An ash hopper for collecting fly ash entrained by flue gas is provided at the bottom of the inverted cone section.

2. The flue gas quenching device according to claim 1, characterized in that: It also includes an air outlet pipe, which includes a first air outlet pipe and a second air outlet pipe. The first air outlet pipe is connected to the tower body to connect the inside of the first air outlet pipe and the chamber. The first air outlet pipe is suitable for discharging the flue gas after heat exchange with the atomized water from the chamber. The second air outlet pipe is connected to the heat exchanger to connect the inside of the second air outlet pipe and the inside of the heat exchanger. The second air outlet pipe is suitable for discharging the flue gas after heat exchange with the cooling medium from the inside of the heat exchanger.

3. The flue gas quenching device according to claim 2, characterized in that: The air outlet pipeline further includes a first connecting pipeline, and the first connecting pipeline is respectively connected to the first air outlet pipeline and the second air outlet pipeline to connect the first air outlet pipeline and the second air outlet pipeline.

4. The flue gas quenching device according to claim 2, characterized in that: The heat exchanger is disposed adjacent to the top of the tower body in the up-down direction, the second gas outlet pipe is located above the first gas outlet pipe, and at least a portion of the first gas outlet pipe extends upward from the lower end of the tower body.

5. The flue gas quenching device according to claim 2, characterized in that: An extending direction of the first air outlet pipe forms an angle with a length direction of the tower body.

6. The flue gas quenching device according to claim 2, characterized in that: The heat exchanger is further provided with a second inlet and a second outlet, the second inlet is communicated with the second air outlet, and the interior of the heat exchanger is communicated with the interior of the second air outlet pipe through the second outlet.

7. The flue gas quenching device according to claim 6, characterized in that: It also includes a second connecting pipe, which is connected to the air inlet pipe and the heat exchanger to communicate with the second air outlet and the second inlet.

8. The flue gas quenching device according to claim 7, characterized in that: It also includes a regulating valve, which is arranged on the second connecting pipe and is used to control the amount of high-temperature flue gas flowing out of the second air outlet.

9. The flue gas quenching device according to any one of claims 1 to 8, characterized in that: The wet quenching tower and the air inlet pipe are both made of corrosion-resistant materials.

Images