Tail gas self-circulation white feather removing device and method

Abstract

The present application relates to a kind of tail gas self-circulation white feather elimination device and method, present existing industrial tail gas elimination "white feather" effect is not good, the problem of high cost. Including quenching tower, absorption tower, gas-gas heat exchanger, electrostatic precipitator and tail gas suction fan, when using, dry high-temperature tail gas is indirectly heat exchanged in the heat exchange pipe middle of gas-gas heat exchanger, after heat exchange, tail gas enters into quenching tower, and from quenching tower in countercurrent contact with quenching water, after washing condensation, tail gas is discharged from the top of quenching tower to the lower part of absorption tower under the action of circulating fan, dry tail gas is absorbed and filtered after being absorbed and filtered from absorption circulating pump through absorption filtering device, enters into electrostatic precipitator and is purified, then enters into the shell of gas-gas heat exchanger and is indirectly heat exchanged, after purification, tail gas is heated by uncleaned tail gas and is discharged to the environment, i.e. using the heat of tail gas itself to heat tail gas to unsaturated state, the purpose of tail gas white feather elimination is realized, so as to produce low cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of industrial tail gas treatment, in particular to a tail gas self-circulation white plume eliminating device and method. BACKGROUND

[0002] The "white plume" is also called "white smoke plume". In the industrial production process, the tail gas discharged from the chimney mixes with the ambient cold air. In the process of temperature drop, the water vapor contained in the tail gas is condensed to saturation. The water mist produced by condensation presents white feather shape under the refraction and scattering of light, thus being called "white plume".

[0003] In the existing petrochemical and chemical production, more than 80% of the processes need to use catalysts. The preparation of catalysts mainly includes five processes of colloid synthesis, spray drying, high-temperature calcination, filtration and water washing, and air flow drying. A certain amount of high-temperature dust-containing gas is produced in the processes of spray drying, high-temperature calcination and air flow drying. This part of gas can be discharged into the atmosphere only after purification and absorption. Among them, the spray drying process (150-180℃) and the air flow drying process (140-150℃) produce a large amount of exhaust gas with high dust content and the most serious tailing phenomenon. Whether this problem can be effectively solved is the most urgent. At present, the main treatment methods for dry gas at home and abroad include washing, washing + electric dust removal combination technology, etc. After washing and dust removal, the dry gas is discharged into the atmosphere at a temperature of about 40-50℃. Since the dry gas discharged into the atmosphere is in a saturated state, when the ambient temperature is low, the water vapor in the tail gas rapidly condenses into small droplets, forming a "white smoke zone" above the exhaust port, commonly known as "white plume". Compared with the single washing technology, the washing + electric dust removal technology combination has better dust removal and demisting effect, and reduces the moisture content of the exhaust gas. However, in cold weather areas, especially in winter, the "white plume" phenomenon still exists.

[0004] At present, many countries including foreign countries use electric dust removal and demisting technology, which has been widely used in chemical industry, metallurgy and air treatment industries. Although this technology has good demisting effect, it still cannot eliminate the "white plume". At the same time, this technology has the disadvantages of high investment and high production cost. SUMMARY

[0005] The present application aims to solve the problem of poor effect of eliminating "white plume" and high cost of existing industrial tail gas.

[0006] The technical scheme adopted by the present application to solve the technical problems proposed by the present application is as follows:

[0007] The white feather self-circulation eliminating device of the application comprises a quenching tower and an absorption tower, the quenching tower is internally provided with a quenching cooling device, the absorption tower is internally provided with an absorption filtering device, the white feather eliminating device further comprises a gas-gas heat exchanger, an electric dust collector and a tail gas suction fan, the gas-gas heat exchanger comprises a sealed heat exchanger shell and heat exchange pipes arranged in the heat exchanger shell, the gas inlet end of the heat exchange pipes is connected with the tail gas outlet, the gas outlet end of the heat exchange pipes is connected with the gas inlet of the quenching tower, the quenching tower is internally provided with a quenching water nozzle, the quenching water nozzle is arranged above the gas inlet of the quenching tower, a circulating fan is arranged between the gas outlet of the quenching tower and the gas inlet of the absorption tower, the gas outlet of the absorption tower is connected with the gas inlet of the electric dust collector, the gas outlet of the electric dust collector is connected with the gas inlet of the tail gas suction fan, a circulating gas inlet connected with the gas outlet of the tail gas suction fan is arranged on the heat exchanger shell, and an external tail gas outlet is further arranged on the heat exchanger shell.

[0008] The tail gas self-circulation eliminating method of the white feather self-circulation eliminating device of the application comprises the following steps:

[0009] Step A: the dry high-temperature tail gas is indirectly exchanged heat in the heat exchange pipes of the gas-gas heat exchanger, the heat exchange pipes pass through the shell of the gas-gas heat exchanger, and the heat exchange pipes and the shell of the gas-gas heat exchanger form an independent sealed space;

[0010] Step B: the heat-exchanged tail gas enters the quenching tower and is countercurrently contacted with the quenching water in the quenching tower, part of the dust and water vapor carried in the tail gas is washed and condensed, and a small amount of gas dissolved in water is absorbed;

[0011] Step C: the tail gas after washing and condensation is discharged from the top of the quenching tower to the lower part of the absorption tower under the action of the circulating fan, the dry tail gas is absorbed and filtered by the absorption filtering device from the absorption circulating pump, and the harmful gas carried in the dry tail gas is absorbed;

[0012] Step D: the dry tail gas after absorption treatment then enters the electrostatic dust collector, and further removes the solid particles and other substances therein;

[0013] Step F: the dry tail gas after electrostatic precipitation enters the shell of the gas-gas heat exchanger under the action of the tail gas suction fan, the purified tail gas is exchanged heat with the un-purified tail gas in the heat exchange pipes, and the purified tail gas is heated by the un-purified tail gas and then discharged to the environment.

[0014] The technical scheme further limiting the application comprises:

[0015] The white feather eliminating device further comprises a quenching tower circulating pump, the bottom of the quenching tower is provided with a quenching tower water tank, the water inlet of the quenching tower circulating pump is connected with the bottom of the quenching tower water tank, and the water outlet of the quenching tower circulating pump is connected with the quenching water nozzle.

[0016] The outlet of the quenching tower circulating pump is connected with a quenching tower blow-off port.

[0017] The quenching device is a water-cooling ring pipe arranged in the shell wall of the quenching tower.

[0018] The white feather removing device further comprises an absorption tower circulating pump, the absorption filter device is arranged at the upper portion of the absorption tower, the absorption filter device comprises a filler layer, a spray pipe and a demister, the spray pipe is arranged above the filler layer, the demister is arranged at the top of the absorption tower, the bottom of the absorption tower is provided with an absorption tower water tank, the water inlet of the absorption tower circulating pump is connected with the bottom of the absorption tower water tank, and the water outlet of the absorption tower circulating pump is connected with the spray pipe.

[0019] The demister is a mesh cover arranged at the top of the absorption tower, and the gas outlet of the absorption tower is arranged above the mesh cover.

[0020] The water outlet of the absorption tower circulating pump is connected with an absorption tower blow-off port.

[0021] In step B, the bottom of the quenching tower is provided with a quenching tower water tank, the quenching tower circulating pump pumps the quenching water in the quenching tower water tank to the quenching water spray head to be sprayed out, so that a circulating water is formed in the quenching tower, and the quenching tower circulating pump discharges sewage through the quenching tower blow-off port connected with the quenching tower circulating pump.

[0022] In step C, the bottom of the absorption tower is provided with an absorption tower water tank, the absorption filter device comprises a filler layer, a spray pipe and a demister, the absorption tower circulating pump pumps the water in the absorption tower water tank to the spray pipe to be sprayed onto the filler layer, the dry tail gas contacts the sprayed filler layer, the harmful gas dissolved in the water in the dry tail gas is absorbed by the filler layer and then passes through the demister, the demister makes the mist droplets in the tail gas to be deflected, and the absorption tower circulating pump discharges sewage through the absorption tower blow-off port connected with the absorption tower circulating pump.

[0023] By the technical scheme, the tail gas self-circulation white feather eliminating device has the advantages that: when the tail gas self-circulation white feather eliminating device is used, the dry high-temperature tail gas is indirectly exchanged in the heat exchange pipe of the gas-gas heat exchanger, the exchanged tail gas is in countercurrent contact with the quenching water from the quenching tower, part of the dust and water vapor carried by the tail gas is condensed by washing, a small amount of gas dissolved in water is absorbed, the tail gas after washing and condensation is discharged from the top of the quenching tower to the lower part of the absorption tower under the action of the circulating fan, the dry tail gas is filtered by the absorption filtering device, the harmful gas carried by the dry tail gas is absorbed, the dry tail gas after absorption treatment enters the electrostatic precipitator, and the solid particles and other substances in the dry tail gas are further removed; the dry tail gas after electrostatic precipitation enters the shell of the gas-gas heat exchanger under the action of the tail gas suction fan, the purified tail gas is exchanged with the un-purified tail gas in the heat exchange pipe, and the purified tail gas is discharged to the environment after being heated by the un-purified tail gas, that is, the heat of the tail gas itself is used to heat the tail gas to a non-saturated state, the purpose of eliminating white feather of the tail gas is achieved, and the production cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a side view of the tail gas self-circulation white feather eliminating device. DETAILED DESCRIPTION

[0025] The structure of the present application will be further described below with reference to the accompanying drawings.

[0026] Reference Figure 1 In the embodiment, the method for eliminating white feather of the tail gas in the catalyst preparation industry is described, and in the implementation, the method is not limited to the tail gas in the catalyst industry, but can also be applied to the tail gas in other industrial fields, such as petrochemical industry, chemical industry, metallurgy and coal chemical industry, etc. In the embodiment, the dry tail gas in the catalyst preparation industry mainly consists of nitrogen, oxygen, carbon dioxide, water vapor and a small amount of dust, hydrogen chloride, etc., and the temperature is 150-180℃.

[0027] The tail gas self-circulation white feather removing device comprises a quenching tower 1 and an absorption tower 2, the quenching tower is provided with a quenching cooling device, the absorption tower 2 is provided with an absorption filter device 21, the white feather removing device further comprises a gas-gas heat exchanger 3, an electric dust collector 4 and a tail gas suction fan 5, the gas-gas heat exchanger 3 comprises a sealed heat exchanger shell 31 and heat exchange pipes 32 arranged in the heat exchanger shell, the gas inlet end 321 of the heat exchange pipes is connected with a tail gas outlet, and the gas outlet end 322 of the heat exchange pipes is connected with a gas inlet of the quenching tower, the gas-gas heat exchanger can adopt different types such as a tube-shell heat exchanger and a finned tube heat exchanger, the un-purified tail gas is introduced into the heat exchange pipes of the gas-gas heat exchanger, and the high-temperature gas in the pipes exchanges heat with the purified gas in the heat exchanger shell outside the heat exchange pipes, so that the purified gas in the heat exchanger shell is heated, thereby saving cost. The quenching tower 1 is provided with a quenching water nozzle 11, the quenching water nozzle is arranged above the gas inlet 12 of the quenching tower, the quenching water nozzle sprays quenching water to cool and wash the tail gas, and part of the dust and water vapor carried in the tail gas is washed and condensed. In the embodiment, the white feather removing device further comprises a quenching tower circulating pump 6, the bottom of the quenching tower 1 is provided with a quenching tower water tank 13, and a water inlet can be arranged above the quenching tower water tank to discharge water into the quenching tower water tank. The water inlet 61 of the quenching tower circulating pump is connected with the bottom of the quenching tower water tank, and the water outlet 62 of the quenching tower circulating pump is connected with the quenching water nozzle. The quenching cooling device is a water-cooling ring pipe arranged in the wall of the quenching tower shell, and the water-cooling ring pipe is provided with circulating quenching water to cool and quench the quenching tower shell. The quenching tower shell can be made of glass fiber reinforced plastic, and the water-cooling ring pipe and the quenching water nozzle can be made of polytetrafluoroethylene, so as to prevent the corrosion of acid and alkali substances on the equipment. The quenching tower circulating pump pumps the water in the water tank to the quenching water nozzle to be sprayed, the water falls into the quenching tower water tank and is recycled by the quenching tower circulating pump, thereby saving resources. The water outlet 62 of the quenching tower circulating pump is connected with a quenching tower blowdown port 63. When sewage needs to be discharged, the quenching water nozzle is closed, and the sewage is discharged from the quenching tower blowdown port by the quenching tower circulating pump. In the embodiment, the quenching water nozzle is a Venturi structure nozzle. The water pressure of the quenching water nozzle can be increased, so that the tail gas can be rapidly cooled.

[0028] A circulating fan 7 is arranged between the gas outlet 13 of the quenching tower and the gas inlet 22 of the absorption tower, and the circulating fan pumps the cooled and purified gas in the quenching tower into the absorption tower. In the embodiment, the absorption tower is mainly used for absorbing hydrogen chloride gas dissolved in water, and different absorption filter devices can be arranged according to needs to perform targeted absorption and purification during specific implementation.

[0029] In the embodiment, the white feather removing device further comprises an absorption tower circulating pump 8. The absorption filter device is arranged at the upper portion of the absorption tower. The absorption filter device 21 comprises a filler layer, a spray pipe and a demister. The spray pipe is arranged above the filler layer. The demister is arranged at the top of the absorption tower. The bottom of the absorption tower 2 is provided with an absorption tower water tank 23. The water inlet 81 of the absorption tower circulating pump is connected with the bottom of the absorption tower water tank. The water outlet 82 of the absorption tower circulating pump is connected with the spray pipe. The absorption tower circulating pump pumps the water in the absorption tower water tank to the spray pipe to be sprayed. The spray pipe wets the filler layer. The wet filler layer absorbs the hydrogen chloride in the tail gas and further filters the tail gas. The sprayed water falls into the absorption tower water tank and is recycled by the absorption tower circulating pump, thereby saving resources. In the embodiment, the water outlet of the absorption tower circulating pump 8 is connected with an absorption tower blowdown port 83. When it is necessary to discharge sewage, the spray pipe is closed, and the sewage is discharged from the absorption tower blowdown port by the absorption tower circulating pump. In the embodiment, the demister is a mesh cover arranged at the top of the absorption tower. The gas outlet of the absorption tower is arranged above the mesh cover. The mesh cover traps and folds the mist droplets in the tail gas to purify the tail gas again. The absorption tower shell can be made of glass fiber reinforced plastic. The filler layer, the spray pipe and the mesh cover can be made of polytetrafluoroethylene to prevent the corrosion of acid and alkali substances to the equipment.

[0030] The gas outlet 24 of the absorption tower is connected with the gas inlet of the electric dust collector 4. The tail gas enters the electric dust collector. The dust particles are charged in the ionization process of the tail gas through the high-voltage electric field. The dust particles are deposited on the dust collector under the action of the electric field force, thereby further removing the fine dust particles in the tail gas. The gas outlet of the electric dust collector is connected with the gas inlet of the tail gas suction fan 5. The heat exchanger shell 31 is provided with a circulating gas inlet 311 connected with the gas outlet of the tail gas suction fan. The heat exchanger shell is further provided with an external exhaust gas outlet 312. The tail gas suction fan sucks the purified tail gas into the heat exchanger shell. The un-purified high-temperature tail gas in the heat exchange pipe of the gas-gas heat exchanger heats the purified gas in the heat exchanger shell, thereby heating by the heat of the tail gas itself.

[0031] The tail gas self-circulation white feather removing method of the tail gas self-circulation white feather removing device comprises the following steps:

[0032] Step A: The dry high-temperature tail gas mainly comprises nitrogen, oxygen, carbon dioxide, water vapor and a small amount of dust, hydrogen chloride and the like. The temperature of the dry high-temperature tail gas is 150-180℃. The dry high-temperature tail gas is indirectly heat exchanged in the middle of the heat exchange pipe of the gas-gas heat exchanger. The heat exchange pipe penetrates through the shell of the gas-gas heat exchanger. The heat exchange pipe and the shell of the gas-gas heat exchanger form an independent sealed space. The tail gas in the heat exchange pipe is cooled to 110-130 degrees after heat exchange.

[0033] Step B: The heat-exchanged tail gas enters into the quenching tower, the quenching tower circulating pump pumps the quenching water in the quenching water tank to the quenching water spray head to spray out, the tail gas is contacted with the quenching water from the quenching tower in countercurrent, part of the dust and water vapor carried by the tail gas is condensed by washing, a small amount of gas dissolved in water is absorbed, and the tail gas after washing and condensation is about 40-50℃; when pollution needs to be discharged, the quenching water spray head is closed, and the quenching tower circulating pump discharges sewage through the quenching tower sewage outlet connected with the quenching tower circulating pump.

[0034] Step C: The tail gas after washing and condensation is discharged from the top of the quenching tower to the lower part of the absorption tower under the action of the circulating fan, the dry tail gas is absorbed and filtered by the absorption filtering device from the absorption circulating pump, and the harmful gas carried by the dry tail gas is absorbed; in specific implementation, different absorption filtering devices are set according to the harmful gas to be absorbed. In this embodiment, the bottom of the absorption tower is provided with an absorption tower water tank, the absorption filtering device includes a filler layer, a spray pipe and a demister, the absorption tower circulating pump pumps the water in the absorption tower water tank to the spray pipe to spray onto the filler layer, the dry tail gas contacts the sprayed filler layer, and the hydrogen chloride gas dissolved in water in the dry tail gas is absorbed by the filler layer and then passes through the demister, and the demister makes the mist droplets in the tail gas flow. When pollution needs to be discharged, the spray pipe is closed, and the absorption tower circulating pump discharges sewage through the absorption tower sewage outlet connected with the absorption tower circulating pump.

[0035] Step D: The dry tail gas after absorption treatment then enters into the electrostatic precipitator to further remove solid particles and other substances therein; the dust particles are charged in the high-voltage electric field ionization process of the tail gas in the electric precipitator, and the dust particles are deposited on the dust collector under the action of the electric field force, so as to further remove the fine dust particles in the tail gas.

[0036] Step F: The dry tail gas after electrostatic precipitation enters into the shell of the gas-gas heat exchanger under the action of the tail gas suction fan, the purified tail gas is heat-exchanged with the un-purified tail gas in the heat exchange pipe, and the purified tail gas is heated to 60-80℃ by the un-purified tail gas and then discharged to the environment. Thus, the tail gas is heated to a non-saturated state by using the heat of the tail gas itself, the purpose of tail gas white feather elimination is achieved, and the production cost is low.

[0037] In the description of the application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0038] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0039] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like 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 application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0041] Although the specific embodiments of the present application are described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of the present application. Various modifications and variations made by those skilled in the art within the scope described in the claims are still within the scope of protection of the present application.

Claims

1. A tail gas self-circulation white feather elimination device, comprising a quench tower and an absorption tower, wherein the quench tower is equipped with a quench cooling device, and the absorption tower is equipped with an absorption and filtration device, characterized in that: The white feather elimination device further includes a gas-to-gas heat exchanger, an electrostatic precipitator, and an exhaust gas suction fan. The gas-to-gas heat exchanger includes a sealed heat exchanger shell and heat exchange tubes disposed within the shell. The inlet end of the heat exchange tubes is connected to the exhaust gas outlet, and the outlet end is connected to the inlet of a quench tower. The quench tower is equipped with quench water nozzles positioned above the inlet of the quench tower. A circulating fan is installed between the outlet of the quench tower and the inlet of the absorption tower. The outlet of the absorption tower is connected to the inlet of the electrostatic precipitator, and the outlet of the electrostatic precipitator is connected to the inlet of the exhaust gas suction fan. The heat exchanger shell has a circulating inlet connected to the outlet of the exhaust gas suction fan. The heat exchanger shell also has... The device includes an exhaust gas outlet; the white feather elimination device also includes an absorption tower circulation pump, the absorption and filtration device is located at the top of the absorption tower, the absorption and filtration device includes a packing layer, a spray pipe and a demister, the spray pipe is installed above the packing layer, the demister is located at the top of the absorption tower, the bottom of the absorption tower is provided with an absorption tower water tank, the inlet of the absorption tower circulation pump is connected to the bottom of the absorption tower water tank, and the outlet of the absorption tower circulation pump is connected to the spray pipe; the white feather elimination device also includes a quench tower circulation pump, the bottom of the quench tower is provided with a quench tower water tank, the inlet of the quench tower circulation pump is connected to the bottom of the quench tower water tank, and the outlet of the quench tower circulation pump is connected to a quench water nozzle.

2. The exhaust gas self-circulation white feather elimination device as described in claim 1, characterized in that: The outlet of the quench tower circulating pump is connected to the quench tower drain outlet.

3. The exhaust gas self-circulation white feather elimination device as described in claim 1, characterized in that: The aforementioned rapid cooling device is a water-cooled ring pipe installed inside the shell wall of the rapid cooling tower.

4. The exhaust gas self-circulation white feather elimination device as described in claim 1, characterized in that: The demister is a mesh cover installed at the top of the absorption tower, with the air outlet of the absorption tower positioned above the mesh cover.

5. The exhaust gas self-circulation white feather elimination device as described in claim 1, characterized in that: The outlet of the absorption tower circulating pump is connected to the absorption tower drain outlet.

6. A method for eliminating white feathers from exhaust gas using an exhaust gas self-circulation white feather elimination device as described in any one of claims 1-5, characterized in that: The steps include the following: Step A: The dry, high-temperature exhaust gas enters the heat exchange tubes in the gas-to-gas heat exchanger for indirect heat exchange. The heat exchange tubes pass through the shell of the gas-to-gas heat exchanger, and the heat exchange tubes and the shell of the gas-to-gas heat exchanger form an independent sealed space. Step B: The exhaust gas after heat exchange enters the quench tower and comes into countercurrent contact with the quench water from the quench tower. Some of the dust and water vapor carried in the exhaust gas are washed and condensed, and a small amount of water-soluble gases are absorbed. Step C: After washing and condensation, the exhaust gas is discharged from the top of the quench tower to the bottom of the absorption tower by the action of the circulating fan. The dried exhaust gas and the gas from the absorption circulation pump are absorbed and filtered by the absorption filtration device, and the harmful gases carried in the dried exhaust gas are absorbed. The bottom of the absorption tower is equipped with an absorption tower water tank. The absorption filtration device includes a packing layer, a spray pipe and a demister. The absorption tower circulation pump pumps water from the absorption tower water tank to the spray pipe and sprays it onto the packing layer. The dried exhaust gas comes into contact with the sprayed packing layer. The harmful gases dissolved in water in the dried exhaust gas are absorbed by the packing layer and then pass through the demister. The demister deflects the mist droplets in the exhaust gas. The absorption tower circulation pump discharges the wastewater through the absorption tower drain port connected to the absorption tower circulation pump. Step D: The dried exhaust gas after absorption treatment then enters the electrostatic precipitator to further remove solid particles and other substances. Step F: The dried exhaust gas after electrostatic dust removal enters the shell of the gas-to-gas heat exchanger under the action of the exhaust gas suction fan. The purified exhaust gas exchanges heat with the unpurified exhaust gas in the heat exchange tube. The purified exhaust gas is heated by the unpurified exhaust gas and then discharged into the environment.

7. The method for eliminating white feathers through exhaust gas self-circulation as described in claim 6, characterized in that: In step B, a quench tower water tank is provided at the bottom of the quench tower. The quench tower circulation pump draws the quench water in the quench tower water tank to the quench water nozzle and sprays it out, thereby forming circulating water in the quench tower. The quench tower circulation pump discharges the sewage through the quench tower drain port connected to the quench tower circulation pump.

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