Pretreatment device for combustion of yellow phosphorus tail gas

Abstract

The utility model provides a combustion pretreatment device for yellow phosphorus tail gas, which relates to the technical field of yellow phosphorus production equipment and comprises a yellow phosphorus tail gas collecting mechanism, a yellow phosphorus tail gas dust removing mechanism, a yellow phosphorus tail gas drying mechanism and a tail gas harmful component removing mechanism which are sequentially connected, and the yellow phosphorus tail gas collecting mechanism comprises a tail gas collecting pipeline and a tail gas fan. The tail gas collecting mechanism is used for collecting tail gas generated in the production process, is connected with the yellow phosphorus tail gas dust removing mechanism, and is connected to the tail gas harmful component removing mechanism after passing through the yellow phosphorus tail gas drying mechanism; two-stage dust removal is arranged in the tail gas dust removal mechanism and comprises a reverse water flow flushing dust removal structure and an atomization dust removal structure, the contact degree of tail gas and cleaning water is increased, and the content of particle impurities in the tail gas is reduced; in addition, a heating reactor with a parallel structure is adopted for removing, the overall reaction efficiency and safety are greatly improved, meanwhile, the structure is simple and efficient, and smooth proceeding of a subsequent comprehensive utilization process can be guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of yellow phosphorus production equipment, in particular to a yellow phosphorus refining and monitoring device. Background Art

[0002] Yellow phosphorus tail gas is waste gas generated during the production of yellow phosphorus, which contains a variety of harmful gases and impurities. Therefore, before the tail gas is burned and utilized, it must be pretreated to ensure the safety and environmental protection of the combustion process.

[0003] During the pretreatment process, the yellow phosphorus tail gas must first be analyzed for its components. By using equipment such as gas analyzers, the content and proportion of each component in the tail gas can be accurately understood to provide data support for subsequent treatment; yellow phosphorus tail gas contains a variety of harmful impurities, such as sulfides, nitrogen oxides, etc. These impurities not only have a negative impact on the combustion process, but may also cause harm to the environment and human health. Therefore, during the pretreatment process, appropriate methods need to be used to remove these harmful impurities. Common methods include physical adsorption, chemical absorption, etc.; in order to ensure the stability and efficiency of the combustion process, the concentration of yellow phosphorus tail gas needs to be adjusted. By using methods such as dilution and concentration, the concentration of combustible gases in the tail gas can be adjusted to an appropriate range to meet the combustion requirements; gas temperature is one of the important factors affecting the combustion process. During the pretreatment process, the temperature of the yellow phosphorus tail gas needs to be controlled to ensure that it can burn stably during the combustion process. Common temperature control methods include heating and cooling; the stability of gas pressure is crucial to the combustion process. During the pretreatment process, appropriate measures need to be taken to stabilize the pressure of yellow phosphorus tail gas to prevent problems such as pressure fluctuations and unstable combustion during the combustion process; yellow phosphorus tail gas has certain toxicity and flammability, so effective measures need to be taken during the pretreatment process to prevent gas leakage. This includes using equipment and pipelines with good sealing properties, and regularly checking and maintaining the equipment status.

[0004] Pretreatment of yellow phosphorus tail gas before combustion is an essential part of the yellow phosphorus production process. The safety and environmental friendliness of the combustion process can be ensured through a series of steps such as analyzing gas composition, removing harmful impurities, adjusting gas concentration, controlling gas temperature, stabilizing gas pressure, preventing gas leakage, and taking safety protection measures. In the prior art, bag dust removal or electrostatic dust removal is mostly used for tail gas dust removal, and the processing cost is relatively high. In addition, in order to increase the speed of eliminating harmful components in tail gas, the prior art mostly uses equipment with a single channel structure to complete the operation stability and removal efficiency. Better measures should be sought for tail gas pretreatment, which will help improve combustion efficiency, reduce production costs, and achieve sustainable development. Summary of the invention

[0005] In order to solve the above problems, the utility model provides a combustion pre-treatment device for yellow phosphorus tail gas, which realizes the safety and environmental protection of tail gas treatment by optimizing the electric furnace tail gas pretreatment equipment involved in the yellow phosphorus preparation process.

[0006] The utility model adopts the following technical scheme: a combustion pre-treatment device for yellow phosphorus tail gas, comprising a yellow phosphorus tail gas collection mechanism, a yellow phosphorus tail gas dust removal mechanism, a yellow phosphorus tail gas drying mechanism, and a tail gas harmful component removal mechanism which are connected in sequence, characterized in that the yellow phosphorus tail gas collection mechanism comprises a tail gas collection pipeline and a tail gas fan, which is used to collect the tail gas generated in the production process, and is connected to the yellow phosphorus tail gas dust removal mechanism, and is connected to the tail gas harmful component removal mechanism after passing through the yellow phosphorus tail gas drying mechanism;

[0007] The yellow phosphorus tail gas dust removal mechanism is connected to the gas outlet end of the yellow phosphorus tail gas collection mechanism, and a reverse water flow is used to flush the dust removal structure;

[0008] First, the reverse water flow flushing dust removal structure includes a sealed flushing tower 1, a particle deposition cylinder 2, a yellow phosphorus tail gas intake pipe 3, a flushing water pipe 4 and a spiral flushing pipe 5;

[0009] The sealed flushing tower 1 is arranged inside the hollow particle sedimentation cylinder 2, and the two share a sealed top plate; a yellow phosphorus tail gas inlet pipe 3 connected to the gas outlet end of the yellow phosphorus tail gas collection mechanism is arranged in the middle and lower part of the sealed flushing tower 1, and the yellow phosphorus tail gas inlet pipe 3 is connected to the middle and lower part of the spiral flushing pipe 5, and the yellow phosphorus tail gas flows from bottom to top; and the spiral flushing pipe 5 is distributed in the particle sedimentation cylinder 2 from top to bottom, and its bottom end outlet is immersed below the flushing water surface of the lower part of the particle sedimentation cylinder 2; a flushing water pipe 4 is arranged on one side of the top of the sealed flushing tower 1, and the flushing water pipe 4 extends into the sealed flushing tower 1 and is connected to the top of the spiral flushing pipe 5; at the lower end of the sealed flushing tower 1, a multi-stage sealed sedimentation tank 6 is arranged, and the flushing water flow is recycled after sedimentation;

[0010] A partition 7 is vertically arranged inside the particle deposition cylinder 2, and the lower end of the partition 7 is immersed below the surface of the flushing water, so that the spiral flushing pipe 5 is isolated in an independent space on one side of the particle deposition cylinder 2. The inlet and outlet pipes of the temperature regulating medium are arranged on the side wall of the independent space, and the overall temperature in the independent space is adjusted according to the flushing conditions of the particles in the yellow phosphorus tail gas; at the same time, an exhaust gas recovery pipe 8 is arranged on the side plate on the other side of the particle deposition cylinder 2, and a yellow phosphorus tail gas outlet pipe 9 arranged on the other side of the top of the sealed flushing tower 1 extends from the top into the flushing water at the bottom;

[0011] The yellow phosphorus tail gas inlet pipe 3 enters from the lower part of the spiral flushing pipe 5, and the flushing water pipe 4 enters from the top of the sealed flushing tower 1. The two are connected through the spiral flushing pipe 5. The water and the yellow phosphorus tail gas meet in reverse in the spiral flushing pipe 5 and are mixed and flushed. The solid particles contained in the tail gas are collected into the water. The water containing particles enters the multi-stage sealed sedimentation tank 6 through the particle sedimentation cylinder 2 for sedimentation and separation. After the tail gas comes out from the top of the spiral flushing pipe 5, it is introduced into the flushing water by the yellow phosphorus tail gas outlet pipe 9 for rinsing, and then collected in the tail gas recovery pipe 8 on the side plate of the particle sedimentation cylinder 2, and the dust-removed tail gas is transported backward to the yellow phosphorus tail gas drying mechanism;

[0012] A tail gas harmful component removal mechanism is arranged behind the yellow phosphorus tail gas drying mechanism, and adopts a parallel heating reaction structure, including an alkali washing tower 16, a demister 17, an alkali solution supplementary pump 18, a steam preheater 19, a harmful component reactor 20, a fan 21 and a cooling tower 22; wherein, the alkali washing tower 16 is connected to the gas outlet end of the yellow phosphorus tail gas drying mechanism arranged at the front end through a pipeline and a vacuum pump; the outlet end of the vacuum pump is connected to the alkali washing tower 16, a drain pipe is left at the bottom of the alkali washing tower 16, and flows back into the alkali solution pool, the top of the alkali washing tower 16 is connected to the liquid inlet pipe, which is connected to the alkali solution pool, and an alkali solution supplementary pump 18 is arranged between the two; the gas outlet pipe arranged at the top of the alkali washing tower 16 is connected to the demister 17 The pipeline is then divided into several parallel branches, each of which is connected to a steam preheater 19, with its upper end connected to a high-temperature steam pipe and its lower end connected to a drain pipe; at the rear end of the steam preheater 19 of each route, a reactor with a temperature control device is provided, and harmful components in the exhaust gas are catalytically oxidized; after passing through the reactor, the branch pipes are merged and connected to a cooling tower 22 for cooling; during the whole process, the exhaust gas to be purified first passes through an alkali washing tower 16 to remove carbon dioxide and part of phosphorus, then is heated by a preheater and passes through the reactor from bottom to top, in the reactor, phosphorus and sulfur are catalytically oxidized and adsorbed by a catalyst, and then the exhaust gas is cooled and sent to the exhaust gas boiler as fuel.

[0013] Preferably, an atomizing dust removal structure is arranged behind the reverse water flow flushing dust removal structure, and the atomizing dust removal structure includes an atomizing collection pool 10, an atomizing water pipe 11, an atomizing dust removal tower 12, an air inlet pipe 13 and an air outlet pipe 14; wherein one end of the air inlet pipe 13 is connected to the tail gas recovery pipe 8 in the reverse water flow flushing dust removal structure, and the other end is connected to the bottom of the atomizing dust removal tower 12; the atomizing dust removal tower 12 is fixed to the upper end of the atomizing collection pool 10, and the atomizing water pipe 11 is connected to the top of the atomizing dust removal tower 12, and is close to the inner wall of the atomizing dust removal tower 12 from top to bottom. The yellow phosphorus tail gas is evenly distributed below and connected to atomizing nozzles 15 at different heights; the air outlet pipe 14 is connected to the top of the atomizing dust removal tower 12; the washed yellow phosphorus tail gas enters the atomizing dust removal tower 12 through the air inlet pipe and flows from bottom to top, and at the same time, the atomizing water pipe 11 sends water to the atomizing dust removal tower 12 and atomizes it into gas, adjusts the direction of the atomizing nozzle 15, and makes the water mist spray obliquely downward, which contacts the yellow phosphorus tail gas, recovers the residual particles in the atomizing collection pool 10 and collects them in the multi-stage sealed sedimentation tank 6, and the tail gas after dust removal is guided to the dryer through the air outlet pipe 14 and transported backward.

[0014] Preferably, the cooling tower 22 is hollow inside and is configured to have a structure in which cooling water is sprayed from top to bottom for cooling.

[0015] Preferably, a plurality of thin-walled coils are arranged inside the cooling tower 22, and the exhaust gas flows in the coils. A fan 21 is arranged outside the cooling tower 22 to cool the exhaust gas in the coils by the cooling airflow flowing in the space between the inside of the cooling tower 22 and the coils. Beneficial Effects

[0016] ① The utility model improves the purification efficiency and purification effect of yellow phosphorus tail gas by optimizing the design of key dust removal and harm removal mechanisms in yellow phosphorus tail gas pretreatment.

[0017] ② The present application sets up two-stage dust removal in the exhaust gas dust removal mechanism, namely a reverse water flow flushing dust removal structure and an atomization dust removal structure, which increases the contact degree between the exhaust gas and the cleaning water, removes the particulate matter in the exhaust gas to the greatest extent, and reduces the content of particulate impurities in the exhaust gas.

[0018] ③ This application uses a parallel-structured heating reactor to remove harmful components in yellow phosphorus tail gas, which greatly improves the overall reaction efficiency and safety. At the same time, the structure is simple and efficient, which can ensure the smooth progress of the subsequent comprehensive utilization process. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the structure of the combustion pre-treatment device of yellow phosphorus tail gas described in Example 1.

[0020] Figure 2 It is a schematic diagram of the reverse water flow flushing dust removal structure.

[0021] Figure 3 It is a schematic diagram of the structure of the combustion pre-treatment device of yellow phosphorus tail gas described in Example 2.

[0022] Figure 4 It is a schematic diagram of the atomization dust removal structure described in Example 2.

[0023] In the figure: sealed flushing tower 1, particle sedimentation cylinder 2, yellow phosphorus tail gas inlet pipe 3, flushing water pipe 4, spiral flushing pipe 5, multi-stage sealed sedimentation tank 6, partition 7, tail gas recovery pipe 8, tail gas outlet pipe 9, atomization collection tank 10, atomization water pipe 11, atomization dust removal tower 12, inlet pipe 13, outlet pipe 14, atomization nozzle 15, alkali washing tower 16, demister 17, alkali solution replenishing pump 18, steam preheater 19, harmful component reactor 20, fan 21, cooling tower 22. DETAILED DESCRIPTION

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments. Example 1

[0025] refer to Figure 1-2 , this embodiment describes a combustion pre-treatment device for yellow phosphorus tail gas, comprising a yellow phosphorus tail gas collection mechanism, a yellow phosphorus tail gas dust removal mechanism, a yellow phosphorus tail gas drying mechanism, and a tail gas harmful component removal mechanism connected in sequence;

[0026] The yellow phosphorus tail gas collection mechanism includes a tail gas collection pipeline and a tail gas fan, which is used to collect the tail gas generated during the production process and is connected to the yellow phosphorus tail gas dust removal mechanism, and then connected to the tail gas harmful component removal mechanism after passing through the yellow phosphorus tail gas drying mechanism;

[0027] The yellow phosphorus tail gas dust removal mechanism is connected to the air outlet of the yellow phosphorus tail gas collection mechanism, and adopts a reverse water flow flushing dust removal structure; it includes a sealed flushing tower 1, a particle deposition cylinder 2, a yellow phosphorus tail gas inlet pipe 3, a flushing water pipe 4 and a spiral flushing pipe 5; the sealed flushing tower 1 is arranged inside the hollow particle deposition cylinder 2, and the two share a sealed top plate; the middle and lower part of the sealed flushing tower 1 is provided with a yellow phosphorus tail gas inlet pipe 3 connected to the air outlet of the yellow phosphorus tail gas collection mechanism, and the yellow phosphorus tail gas inlet pipe 3 is connected to the middle and lower part of the spiral flushing pipe 5, and the yellow phosphorus tail gas inlet pipe 3 is connected to the middle and lower part of the spiral flushing pipe 5. Phosphorus tail gas flows from bottom to top; the spiral flushing pipe 5 is distributed in the particle sedimentation cylinder 2 from top to bottom, and its bottom outlet is immersed in the flushing water surface of the lower part of the particle sedimentation cylinder 2; a flushing water pipe 4 is arranged on one side of the top of the sealed flushing tower 1, and the flushing water pipe 4 extends into the sealed flushing tower 1 and is connected with the top of the spiral flushing pipe 5; at the lower end of the sealed flushing tower 1, a multi-stage sealed sedimentation tank 6 is arranged, and the flushing water flow is recycled after sedimentation; a partition 7 is vertically arranged inside the particle sedimentation cylinder 2, and the lower end of the partition 7 is immersed in The spiral flushing pipe 5 is submerged under the surface of the flushing water, and is isolated in an independent space on one side of the particle deposition cylinder 2. The inlet and outlet pipes of the temperature regulating medium are arranged on the side wall of the independent space, and the overall temperature in the independent space is adjusted according to the flushing conditions of the particles in the yellow phosphorus tail gas. At the same time, an exhaust gas recovery pipe 8 is arranged on the side plate on the other side of the particle deposition cylinder 2, and a yellow phosphorus tail gas outlet pipe 9 arranged on the other side of the top of the sealed flushing tower 1 extends from the top into the flushing water at the bottom; the yellow phosphorus tail gas inlet pipe 3 enters from the lower part of the spiral flushing pipe 5, and the flushing water pipe 4 It enters from the top of the sealed flushing tower 1, and the two are connected by the spiral flushing pipe 5. Water and yellow phosphorus tail gas meet in reverse in the spiral flushing pipe 5 and are mixed for flushing. The solid particles contained in the tail gas are collected in the water, and the water containing particles enters the multi-stage sealed sedimentation tank 6 through the particle sedimentation cylinder 2 for sedimentation and separation. After the tail gas comes out from the top of the spiral flushing pipe 5, it is introduced into the flushing water by the yellow phosphorus tail gas outlet pipe 9 for rinsing, and then collected in the tail gas recovery pipe 8 on the side plate of the particle sedimentation cylinder 2, and the dust-removed tail gas is transported backward to the yellow phosphorus tail gas drying mechanism.

[0028] A tail gas harmful component removal mechanism is arranged behind the yellow phosphorus tail gas drying mechanism, and adopts a parallel heating reaction structure, including an alkali washing tower 16, a demister 17, an alkali solution supplementary pump 18, a steam preheater 19, a harmful component reactor 20, a fan 21 and a cooling tower 22; wherein, the alkali washing tower 16 is connected to the gas outlet end of the yellow phosphorus tail gas drying mechanism arranged at the front end through a pipeline and a vacuum pump; the outlet end of the vacuum pump is connected to the alkali washing tower 16, a drain pipe is left at the bottom of the alkali washing tower 16, and flows back into the alkali solution pool, the top of the alkali washing tower 16 is connected to a liquid inlet pipe, which is connected to the alkali solution pool, and an alkali solution supplementary pump 18 is arranged between the two; the gas outlet pipe arranged at the top of the alkali washing tower 16 is connected to the demister 17, and then the pipeline is divided into several parallel branch pipes, each branch pipe is connected to a steam preheater 19, the upper end of which is connected to a high-temperature steam pipe, and the lower end is connected to a drain pipe; at the rear end of the steam preheater 19 of each road, a reactor with a temperature control device is provided, and harmful components in the tail gas are catalytically oxidized; after passing through the reactor, the branch pipes are merged and connected to a cooling tower 22 for cooling; the cooling tower 22 is hollow inside and is configured to have a structure in which cooling water is sprayed from top to bottom for cooling; the tail gas to be purified first passes through an alkali washing tower 16 to remove carbon dioxide and part of phosphorus, then is heated by a preheater and passes through the reactor from bottom to top, in which phosphorus and sulfur are catalytically oxidized and adsorbed by a catalyst, and then the tail gas is cooled and sent to a tail gas boiler as fuel; Example 2

[0029] refer to Figure 2-4 This embodiment describes a combustion pre-treatment device for yellow phosphorus tail gas, and its structure is basically the same as that described in Example 1, except that:

[0030] An atomizing dust removal structure is arranged behind the reverse water flow flushing dust removal structure, and the atomizing dust removal structure includes an atomizing collection pool 10, an atomizing water pipe 11, an atomizing dust removal tower 12, an air inlet pipe 13 and an air outlet pipe 14; wherein one end of the air inlet pipe 13 is connected to the tail gas recovery pipe 8 in the reverse water flow flushing dust removal structure, and the other end is connected to the bottom of the atomizing dust removal tower 12; the atomizing dust removal tower 12 is fixed to the upper end of the atomizing collection pool 10, the atomizing water pipe 11 is connected to the top of the atomizing dust removal tower 12, and is evenly attached to the inner wall of the atomizing dust removal tower 12 from top to bottom. The yellow phosphorus tail gas is evenly distributed and connected to atomizing nozzles 15 at different heights; the outlet pipe 14 is connected to the top of the atomizing dust removal tower 12; the washed yellow phosphorus tail gas enters the atomizing dust removal tower 12 through the air inlet pipe and flows from bottom to top, and at the same time, the atomizing water pipe 11 sends water to the atomizing dust removal tower 12 and atomizes it into gas, adjusts the direction of the atomizing nozzle 15, and makes the water mist spray obliquely downward, which contacts the yellow phosphorus tail gas, recovers the residual particles in the atomizing collection pool 10 and collects them in the multi-stage sealed sedimentation tank 6, and the tail gas after dust removal is guided to the dryer through the outlet pipe 14 and transported backward.

[0031] In addition, a plurality of thin-walled coils are arranged inside the cooling tower 22, and the exhaust gas flows in the coils. A fan 21 is arranged outside the cooling tower 22 to cool the exhaust gas in the coils by the cooling airflow flowing in the space between the inside of the cooling tower 22 and the coils.

Claims

1. A combustion pre-treatment device for yellow phosphorus tail gas, comprising a yellow phosphorus tail gas collecting mechanism, a yellow phosphorus tail gas dust removal mechanism, a yellow phosphorus tail gas drying mechanism, and a tail gas harmful component removal mechanism connected in sequence, characterized in that: The yellow phosphorus tail gas collection mechanism includes a tail gas collection pipeline and a tail gas fan, which is used to collect the tail gas generated during the production process and is connected to the yellow phosphorus tail gas dust removal mechanism, and then connected to the tail gas harmful component removal mechanism after passing through the yellow phosphorus tail gas drying mechanism; The yellow phosphorus tail gas dust removal mechanism is connected to the gas outlet end of the yellow phosphorus tail gas collection mechanism, and a reverse water flow is used to flush the dust removal structure; First, the reverse water flow flushing dust removal structure includes a sealed flushing tower (1), a particle deposition cylinder (2), a yellow phosphorus tail gas intake pipe (3), a flushing water pipe (4) and a spiral flushing pipe (5); The sealed flushing tower (1) is arranged inside a hollow particle sedimentation cylinder (2), and the two share a sealed top plate; a yellow phosphorus tail gas inlet pipe (3) connected to the gas outlet end of the yellow phosphorus tail gas collection mechanism is arranged at the middle and lower part of the sealed flushing tower (1), and the yellow phosphorus tail gas inlet pipe (3) is connected to the middle and lower part of the spiral flushing pipe (5), and the yellow phosphorus tail gas flows from bottom to top; and the spiral flushing pipe (5) is distributed from top to bottom in the particle sedimentation cylinder (2), and its bottom end outlet is immersed below the flushing water surface of the lower part of the particle sedimentation cylinder (2); a flushing water pipe (4) is arranged on one side of the top of the sealed flushing tower (1), and the flushing water pipe (4) extends into the sealed flushing tower (1) and is connected to the top of the spiral flushing pipe (5); at the lower end of the sealed flushing tower (1), a multi-stage sealed sedimentation tank (6) is arranged, and the flushing water flow is recycled after sedimentation; A partition (7) is vertically arranged inside the particle deposition cylinder (2), and the lower end of the partition (7) is immersed below the surface of the flushing water, so that the spiral flushing pipe (5) is isolated in an independent space on one side of the particle deposition cylinder (2). Inlet and outlet pipes of a temperature regulating medium are arranged on the side wall of the independent space, and the overall temperature in the independent space is adjusted according to the flushing conditions of the particles in the yellow phosphorus tail gas. At the same time, an exhaust gas recovery pipe (8) is arranged on the side plate on the other side of the particle deposition cylinder (2), and a yellow phosphorus tail gas outlet pipe (9) arranged on the other side of the top of the sealed flushing tower (1) extends from the top into the flushing water at the bottom. The yellow phosphorus tail gas inlet pipe (3) enters from the lower middle part of the spiral flushing pipe (5), and the flushing water pipe (4) enters from the top of the sealed flushing tower (1). The two are connected through the spiral flushing pipe (5). Water and yellow phosphorus tail gas meet in reverse in the spiral flushing pipe (5) and are mixed and flushed. Solid particles contained in the tail gas are collected in the water. The water containing particles enters the multi-stage sealed sedimentation tank (6) through the particle sedimentation cylinder (2) for sedimentation and separation. After the tail gas comes out from the top of the spiral flushing pipe (5), it is introduced into the flushing water through the yellow phosphorus tail gas outlet pipe (9) for rinsing, and then collected in the tail gas recovery pipe (8) on the side plate of the particle sedimentation cylinder (2). The tail gas after dust removal is transported backward to the yellow phosphorus tail gas drying mechanism; A tail gas harmful component removal mechanism is arranged behind the yellow phosphorus tail gas drying mechanism, and adopts a parallel heating reaction structure, including an alkali washing tower (16), a demister (17), an alkali solution replenishing pump (18), a steam preheater (19), a harmful component reactor (20), a fan (21) and a cooling tower (22); wherein the alkali washing tower (16) is connected to the gas outlet end of the yellow phosphorus tail gas drying mechanism arranged at the front end through a pipeline and a vacuum pump; the outlet end of the vacuum pump is connected to the alkali washing tower (16), and a drain pipe is left at the bottom of the alkali washing tower (16) and flows back into the alkali solution pool. The top is connected to a liquid inlet pipe, which is connected to an alkali liquid pool, and an alkali liquid replenishing pump (18) is arranged between the two; the outlet pipe arranged at the top of the alkali washing tower (16) is connected to the demister (17), and then the pipeline is divided into a plurality of parallel branch pipes, each branch pipe is connected to a steam preheater (19), the upper end of which is connected to a high-temperature steam pipe, and the lower end is connected to a drain pipe; at the rear end of the steam preheater (19) of each road, a reactor with a temperature control device is arranged, and harmful components in the exhaust gas are catalytically oxidized; after passing through the reactor, the branch pipes are merged and connected to a cooling tower (22) for cooling.

2. A combustion pre-treatment device for yellow phosphorus tail gas according to claim 1, characterized in that: An atomizing dust removal structure is arranged behind the reverse water flow flushing dust removal structure, and the atomizing dust removal structure comprises an atomizing collection pool (10), an atomizing water pipe (11), an atomizing dust removal tower (12), an air inlet pipe (13), and an air outlet pipe (14); wherein one end of the air inlet pipe (13) is connected to the tail gas recovery pipe (8) in the reverse water flow flushing dust removal structure, and the other end is connected to the bottom of the atomizing dust removal tower (12); the atomizing dust removal tower (12) is fixed to the upper end of the atomizing collection pool (10), the atomizing water pipe (11) is connected to the top of the atomizing dust removal tower (12), and is evenly distributed from top to bottom close to the inner wall of the atomizing dust removal tower (12), and is connected to atomizing nozzles (15) at different heights; and the air outlet pipe (14) is connected to the top of the atomizing dust removal tower (12).

3. The combustion pre-treatment device of yellow phosphorus tail gas according to claim 1 is characterized in that: The cooling tower (22) is hollow inside and is configured to have a structure in which cooling water is sprayed from top to bottom for cooling.

4. The combustion pre-treatment device of yellow phosphorus tail gas according to claim 1, characterized in that: A plurality of thin-walled coils are arranged inside the cooling tower (22), and the exhaust gas flows in the coils. A fan (21) is arranged outside the cooling tower (22) to cool the exhaust gas in the coils by a cooling airflow flowing in the space between the inside of the cooling tower (22) and the coils.

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