Acid Mist Control System and Its Usage Method

Abstract

The present invention belongs to the technical field of gas purification, and discloses an acid mist control system and a method for using the same. The acid mist control system includes a process gas pipeline, a compressed air injection assembly, and a first acid mist control unit and a second acid mist control unit that operate alternately. The process gas pipeline is connected to a process gas cooler and a WSA condenser; the first acid mist control unit includes a first combustion gas production assembly, a first valve, and a first outlet pipe; the second acid mist control unit includes a second combustion gas production assembly, a second valve, and a second outlet pipe. The outlet end of the second outlet pipe extends into and is connected to the process gas pipeline. The first outlet pipe is connected to the second outlet pipe and is disposed between the process gas pipeline and the second valve; the outlet of the compressed air pipe is selectively connected to the first outlet pipe or the second outlet pipe and is disposed at the outlet of the first valve or the second valve. The present invention can avoid blockage or corrosion of the pipeline, ensure the unobstructed operation of the system, and ensure the normal production of the acid-making operation.

Description

Technical Field

[0001] The present invention relates to the technical field of gas purification, and particularly relates to an acid mist control system and a method for using the same. Background Art

[0002] An acid mist controller is a device for removing sulfuric acid droplets from process gas and preventing acid mist from being discharged into the atmosphere.

[0003] The working process of the acid mist controller is as follows: First, the gas coming from the outside line is mixed with the air conveyed by the air blower in the mixer. The silicone oil conveyed by the compressed air also enters the mixer after passing through the silicone oil preheater. After the three are mixed, they enter the burner for combustion, generating combustion gas containing silicon dioxide. Then, the combustion gas enters the process gas pipeline from the outlet pipe of the combustion chamber. The silicon dioxide particles in the combustion gas capture the acidic particles in the process gas, forming acid mist. Finally, the acid mist flows to the WSA condenser and condenses into sulfuric acid droplets, thereby reducing the acid mist content in the process gas and preventing the acid mist content in the process gas from exceeding the standard when discharged to the atmosphere.

[0004] The existing acid mist control system usually includes two acid mist controllers, one for normal use and the other for standby. The outlet pipes of both acid mist controllers extend into the process gas pipeline. However, due to the impurities in the process gas, during the operation of the acid mist control system, impurities will accumulate in the part of the outlet pipe of the standby acid mist controller located in the process gas pipeline, and then the pipeline will be blocked, resulting in the operation failure of the acid mist control system. At the same time, the combustion gas discharged from the combustion chamber may cause premature condensation of acid mist in the process gas due to the temperature difference during transportation, resulting in corrosion of the pipeline by sulfuric acid droplets, damage to the acid mist controller or the process gas pipeline, and the acid mist control system cannot operate, affecting the progress of the acid-making operation. Summary of the Invention

[0005] An object of the present invention is to provide an acid mist control system, which can avoid pipeline blockage or corrosion, thereby ensuring the unobstructed operation of the acid mist control system and ensuring the normal production of the acid-making operation.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] An acid mist control system, comprising:

[0008] A process gas pipeline, configured to be connected between a process gas cooler and a WSA condenser;

[0009] A first acid mist control unit, comprising a first combustion gas generating assembly, a first valve and a first outlet pipe. The first outlet pipe is connected to the first combustion gas generating assembly, and the first valve is arranged on the first outlet pipe;

[0010] The second acid mist control unit includes a second combustion gas generating assembly, a second valve, and a second outlet pipe. The second outlet pipe is connected to the second combustion gas generating assembly. The second valve is provided on the second outlet pipe. The outlet end of the second outlet pipe extends into and is connected to the process gas pipeline. The first outlet pipe is connected to the second outlet pipe and is provided between the process gas pipeline and the second valve.

[0011] The compressed air injection assembly includes a compressed air source and a compressed air pipe connected to each other. The outlet of the compressed air pipe is selectively connected to the first outlet pipe or the second outlet pipe and is provided at the outlet of the first valve or the outlet of the second valve.

[0012] The first acid mist control unit and the second acid mist control unit operate alternately.

[0013] As an alternative embodiment of the acid mist control system provided by the present invention, the compressed air pipe includes a first compressed air injection pipe and a second compressed air injection pipe. The first compressed air injection pipe is connected between the compressed air source and the first outlet pipe. The second compressed air injection pipe is connected between the compressed air source and the second outlet pipe.

[0014] As an alternative embodiment of the acid mist control system provided by the present invention, the compressed air injection assembly further includes a third valve provided on the first compressed air injection pipe.

[0015] As an alternative embodiment of the acid mist control system provided by the present invention, the compressed air injection assembly further includes a fourth valve provided on the second compressed air injection pipe.

[0016] As an alternative embodiment of the acid mist control system provided by the present invention, the acid mist control system further includes a temperature detection unit provided on one side of the second outlet pipe close to the process gas pipeline to detect the temperature of the combustion gas in the second outlet pipe.

[0017] As an alternative embodiment of the acid mist control system provided by the present invention, the first combustion gas generating assembly includes a first burner, a first mixer, a first gas pipeline, a first silicone oil pipeline, and a first air pipeline. The outlet of the first burner is connected to the first outlet pipe. The inlet of the first burner is connected to the outlet of the first mixer. The inlets of the first mixer are respectively connected to the first gas pipeline, the first silicone oil pipeline, and the first air pipeline. The first gas pipeline is connected to a first gas source. The first silicone oil pipeline is connected to a first silicone oil tank. The first air pipeline is connected to a first fan.

[0018] As an alternative solution of the acid mist control system provided by the present invention, the second combustion gas generating assembly includes a second burner, a second mixer, a second coal gas pipeline, a second silicone oil pipeline and a second air pipeline. The air outlet of the second burner is communicated with the second outlet pipe, and the air inlet of the second burner is communicated with the outlet of the second mixer. The inlet of the second mixer is respectively communicated with the second coal gas pipeline, the second silicone oil pipeline and the second air pipeline. The second coal gas pipeline is communicated with a second coal gas source, the second silicone oil pipeline is communicated with a second silicone oil tank, and the second air pipeline is communicated with a second fan.

[0019] Another object of the present invention is to provide a method for using an acid mist control system. By adopting the acid mist control system in any one of the above solutions, when the first acid mist control unit is in an operating state and the second acid mist control unit is in a standby state, the method for using the acid mist control system includes:

[0020] Close the second valve, and the air outlet of the compressed air pipe is communicated with the second outlet pipe;

[0021] Open the first valve, and the compressed air source injects compressed air into the compressed air pipe at a preset flow rate.

[0022] Optionally, when the second acid mist control unit is in an operating state and the first acid mist control unit is in a standby state, the method for using the acid mist control system includes:

[0023] Close the first valve, and the air outlet of the compressed air pipe is communicated with the first outlet pipe;

[0024] Open the second valve, and the compressed air source injects compressed air into the compressed air pipe at a preset flow rate.

[0025] Optionally, when the first acid mist control unit or the second acid mist control unit is in an operating state respectively, the temperature detection unit detects the temperature of the combustion gas in the second outlet pipe, and the temperature of the combustion gas is higher than the temperature of the process gas discharged from the process gas cooler.

[0026] Advantages of the present invention:

[0027] In the acid mist control system provided by the present invention, the first acid mist control unit and the second acid mist control unit operate alternately. When the first acid mist control unit is operating, the second acid mist control unit is in a standby state; when the second acid mist control unit is operating, the first acid mist control unit is in a standby state. That is to say, the two acid mist control units can be used alternately to avoid the shutdown of the acid mist control system caused by the failure of the acid mist control unit. The acid mist control system further includes a process gas pipeline and a compressed air injection assembly. The process gas pipeline is connected between the process gas cooler and the WSA condenser. The process gas discharged from the process gas cooler flows through the process gas pipeline, mixes with the combustion gas discharged from the first acid mist control unit or the second acid mist control unit, and then flows into the WSA condenser and condenses into sulfuric acid droplets. The first acid mist control unit includes a first combustion gas generating assembly, a first valve, and a first outlet pipe; the second acid mist control unit includes a second combustion gas generating assembly, a second valve, and a second outlet pipe. The second outlet pipe is connected to the second combustion gas generating assembly. The second valve is arranged on the second outlet pipe. The outlet end of the second outlet pipe extends into and is connected to the process gas pipeline. The first outlet pipe is connected to the second outlet pipe and is arranged between the process gas pipeline and the second valve. That is to say, the first outlet pipe and the second outlet pipe are combined into a single pipe and extend into the process gas pipeline. No matter which standby acid mist control unit is converted to the operating state, the low-temperature combustion gas generated by it is mixed with the outlet gas of the acid mist control unit that was in the operating state before, so as to ensure that the temperature of the combustion gas entering the process gas pipeline will not be too low, resulting in premature acid mist condensation in the process gas and corrosion of the pipeline. At the same time, the co-use of the outlet pipes is also beneficial to preventing blockage of the outlet pipes of the standby acid mist control units. The compressed air injection assembly includes a compressed air source and a compressed air pipe connected to each other. The outlet of the compressed air pipe is selectively connected to the first outlet pipe or the second outlet pipe and is arranged at the outlet of the first valve or the outlet of the second valve. When the first acid mist control unit is in a standby state, the compressed air pipe is connected to the first outlet pipe to ensure the air flow in the pipeline downstream of the first valve and prevent impurity accumulation; when the second acid mist control unit is in a standby state, the compressed air pipe is connected to the second outlet pipe to ensure the air flow in the pipeline downstream of the second valve and prevent impurity accumulation. That is to say, the acid mist control system can avoid pipeline blockage or corrosion, thereby ensuring the unobstructed operation of the acid mist control system and the normal production of the acid production operation. Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments of the present invention. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present invention and these drawings.

[0029] Figure 1 It is a schematic structural diagram of the acid mist control system provided by the embodiments of the present invention.

[0030] In the figure:

[0031] 100, the first gas source; 200, the first silicone oil tank; 300, the first fan; 400, the second gas source; 500, the second silicone oil tank; 600, the second fan;

[0032] 1, the process gas pipeline;

[0033] 2, the first acid mist control unit; 211, the first burner; 212, the first mixer; 213, the first gas pipeline; 214, the first silicone oil pipeline; 215, the first air pipeline; 22, the first valve; 23, the first outlet pipe;

[0034] 3, the second acid mist control unit; 311, the second burner; 312, the second mixer; 313, the second gas pipeline; 314, the second silicone oil pipeline; 315, the second air pipeline; 32, the second valve; 33, the second outlet pipe;

[0035] 4, the compressed air injection assembly; 41, the compressed air source; 42, the first compressed air injection pipe; 43, the second compressed air injection pipe; 44, the third valve; 45, the fourth valve;

[0036] 5, the temperature detection unit. Specific embodiments

[0037] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0040] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the inventive product is customarily placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0042] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0044] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the figures, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are only used to explain the present invention and should not be construed as a limitation on the present invention.

[0045] This embodiment provides an acid mist control system, which is applied to the process gas pipeline connecting the process gas cooler and the WSA condenser, and can avoid the pipeline from being blocked or corroded, thereby ensuring the unobstructed operation of the acid mist control system and ensuring the normal production of the sulfuric acid production operation. As Figure 1As shown, the acid mist control system includes a process gas pipeline 1, a first acid mist control unit 2, a second acid mist control unit 3, and a compressed air injection assembly 4.

[0046] Among them, the first acid mist control unit 2 and the second acid mist control unit 3 operate alternately. When the first acid mist control unit 2 is operating, the second acid mist control unit 3 is in a standby state; when the second acid mist control unit 3 is operating, the first acid mist control unit 2 is in a standby state. That is to say, the two acid mist control units can be used alternately to avoid the shutdown of the acid mist control system due to the failure of the acid mist control unit. The process gas pipeline 1 is connected between the process gas cooler and the WSA condenser. The process gas discharged from the process gas cooler flows through the process gas pipeline 1, mixes with the combustion gas discharged from the first acid mist control unit 2 or the second acid mist control unit 3, and then flows into the WSA condenser and condenses into sulfuric acid droplets.

[0047] Specifically, continue to refer to Figure 1 , the first acid mist control unit 2 includes a first combustion gas generating assembly, a first valve 22, and a first outlet pipe 23. The first outlet pipe 23 is connected to the first combustion gas generating assembly, and the first valve 22 is arranged on the first outlet pipe 23. The second acid mist control unit 3 includes a second combustion gas generating assembly, a second valve 32, and a second outlet pipe 33. The second outlet pipe 33 is connected to the second combustion gas generating assembly, and the second valve 32 is arranged on the second outlet pipe 33. The outlet end of the second outlet pipe 33 extends into and is connected to the process gas pipeline 1. The first outlet pipe 23 is connected to the second outlet pipe 33 and is arranged between the process gas pipeline 1 and the second valve 32. That is to say, the first outlet pipe 23 and the second outlet pipe 33 are combined into a single pipe and extend into the process gas pipeline 1. No matter which standby acid mist control unit is converted to the operating state, the low-temperature combustion gas generated by it is mixed with the outlet gas of the acid mist control unit that was in the operating state before, which can ensure that the temperature of the combustion gas entering the process gas pipeline 1 will not be too low to cause premature acid mist condensation in the process gas and then corrode the pipeline. At the same time, the common use of the outlet pipes is also beneficial to preventing blockage of the outlet pipes of the standby acid mist control units.

[0048] Exemplarily, both the first valve 22 and the second valve 32 can be selected as solenoid valves to respectively control the on / off or flow rate of the combustion gas in the first outlet pipe 23 and the second outlet pipe 33. This is prior art and will not be elaborated in this embodiment.

[0049] Specifically, the first combustion gas generating assembly includes a first burner 211, a first mixer 212, a first gas pipeline 213, a first silicone oil pipeline 214, and a first air pipeline 215. The gas outlet of the first burner 211 is communicated with the first gas outlet pipe 23, and the gas inlet of the first burner 211 is communicated with the outlet of the first mixer 212. The inlets of the first mixer 212 are respectively communicated with the first gas pipeline 213, the first silicone oil pipeline 214, and the first air pipeline 215. The first gas pipeline 213 is communicated with the first gas source 100, the first silicone oil pipeline 214 is communicated with the first silicone oil tank 200, and the first air pipeline 215 is communicated with the first fan 300. That is, the gas generated by the first gas source 100 flows into the first mixer 212 through the first gas pipeline 213. At the same time, the first fan 300 supplies air to the first mixer 212 through the first air pipeline 215. At the same time again, the silicone oil carried and transported by compressed air also enters the first mixer 212 after passing through the silicone oil preheater. After the gas, air, and silicone oil are mixed in the first mixer 212, they enter the first burner 211 for ignition and combustion, thereby generating combustion gas containing silicon dioxide. Then, the combustion gas flows into the first gas outlet pipe 23 through the gas outlet of the first combustion, and finally enters the process gas pipeline 1. In the process gas pipeline 1, the silicon dioxide particles in the combustion gas capture the acidic particles in the process gas to form acid mist. Finally, the acid mist flows to the WSA condenser and condenses into sulfuric acid droplets, thereby reducing the acid mist content in the process gas and preventing the acid mist content in the process gas discharged to the atmosphere from exceeding the standard, causing environmental pollution.

[0050] Correspondingly, the second combustion gas generating assembly includes a second burner 311, a second mixer 312, a second gas pipeline 313, a second silicone oil pipeline 314, and a second air pipeline 315. The gas outlet of the second burner 311 is communicated with the second gas outlet pipe 33, and the gas inlet of the second burner 311 is communicated with the outlet of the second mixer 312. The inlets of the second mixer 312 are respectively communicated with the second gas pipeline 313, the second silicone oil pipeline 314, and the second air pipeline 315. The second gas pipeline 313 is communicated with the second gas source 400, the second silicone oil pipeline 314 is communicated with the second silicone oil tank 500, and the second air pipeline 315 is communicated with the second fan 600. The structure and working principle of the second combustion gas generating assembly are the same as those of the first combustion gas generating assembly, and will not be elaborated herein. It should be noted that in this embodiment, the second gas source 400 and the first gas source 100 are the same gas source.

[0051] Such as Figure 1As shown, the compressed air injection assembly 4 of the acid mist control system includes a compressed air source 41 and a compressed air pipe that are connected and communicate with each other. The air outlet of the compressed air pipe is selectively connected to the first air outlet pipe 23 or the second air outlet pipe 33, and is provided at the outlet of the first valve 22 or the outlet of the second valve 32. When the first acid mist control unit 2 is in a standby state, the compressed air pipe is connected to the first air outlet pipe 23 to ensure the air flow in the pipeline downstream of the first valve 22 and prevent impurity accumulation. When the second acid mist control unit 3 is in a standby state, the compressed air pipe is connected to the second air outlet pipe 33 to ensure the air flow in the pipeline downstream of the second valve 32 and prevent impurity accumulation.

[0052] Specifically, the compressed air pipe includes a first compressed air injection pipe 42 and a second compressed air injection pipe 43. The first compressed air injection pipe 42 is connected between the compressed air source 41 and the first air outlet pipe 23, and the second compressed air injection pipe 43 is connected between the compressed air source 41 and the second air outlet pipe 33. When the first acid mist control unit 2 is in a standby state, the compressed air source 41 feeds compressed air into the first compressed air injection pipe 42, and the compressed air flows into the first air outlet pipe 23 to ensure the air flow in the pipeline downstream of the first valve 22 and prevent silicon dioxide in the combustion gas from accumulating on the inner wall of the first air outlet pipe 23. When the second acid mist control unit 3 is in a standby state, the compressed air source 41 feeds compressed air into the second compressed air injection pipe 43, and the compressed air flows into the second air outlet pipe 33 to ensure the air flow in the pipeline downstream of the second valve 32 and prevent silicon dioxide in the combustion gas from accumulating on the inner wall of the second air outlet pipe 33.

[0053] More specifically, the compressed air injection assembly 4 further includes a third valve 44, and the third valve 44 is provided on the first compressed air injection pipe 42. The third valve 44 can control the on / off and flow rate of the compressed air in the first compressed air injection pipe 42. Correspondingly, the compressed air injection assembly 4 further includes a fourth valve 45, and the fourth valve 45 is provided on the second compressed air injection pipe 43. The fourth valve 45 can control the on / off and flow rate of the compressed air in the second compressed air injection pipe 43.

[0054] Exemplarily, the third valve 44 and the fourth valve 45 can also be selected as solenoid valves. Of course, in other embodiments, the third valve 44 and the fourth valve 45 can also be selected as manual valves, etc., and this embodiment does not limit this here.

[0055] Optionally, continue to refer to Figure 1, the acid mist control system further includes a temperature detection unit 5. The temperature detection unit 5 is disposed on one side of the second outlet pipe 33 close to the process gas pipeline 1 to detect the temperature of the combustion gas in the second outlet pipe 33. In this embodiment, the temperature detection unit 5 includes a thermometer, and the thermometer is disposed near the gas outlet of the second outlet pipe 33. Through the thermometer, the temperature of the combustion gas at the gas outlet of the second outlet pipe 33 can be measured. Making the temperature of the combustion gas at the gas outlet of the second outlet pipe 33 slightly higher than the temperature of the process gas in the process gas pipeline 1 can ensure that the process gas in the process gas pipeline 1 will not condense prematurely due to the temperature difference, thereby avoiding the corrosion of the process gas pipeline 1 by acidic droplets.

[0056] Adopting the acid mist control system in the above solution, this embodiment further provides a method for using the acid mist control system. The acid mist control system has the following two operating states:

[0057] I. When the first acid mist control unit 2 is in an operating state and the second acid mist control unit 3 is in a standby state, the method for using the acid mist control system includes: closing the second valve 32, and connecting the air outlet of the compressed air pipe to the second outlet pipe 33; opening the first valve 22, and injecting compressed air into the compressed air pipe by the compressed air source 41 at a preset flow rate.

[0058] In the first operating state, closing the second valve 32 can prevent the second acid mist control unit 3 from causing gas interference to the second outlet pipe 33 and avoid the gas reflux in the second outlet pipe 33. The compressed air source 41 injects compressed air into the compressed air pipe at a preset flow rate, and the compressed air generates gas flow between the downstream of the second valve 32 and the connection between the second outlet pipe 33 and the first outlet pipe 23, preventing the accumulation of silicon dioxide on the inner wall of the second outlet pipe 33 between the second valve 32 and the connection between the second outlet pipe 33 and the first outlet pipe 23. This preset flow rate does not need to be too large, as long as there is gas flow in the second outlet pipe 33. Specifically, it can be selected according to the pipe diameter of the second outlet pipe 33 and the flow rate of the combustion gas. This embodiment does not limit it here.

[0059] II. When the second acid mist control unit 3 is in an operating state and the first acid mist control unit 2 is in a standby state, the method for using the acid mist control system includes: closing the first valve 22, and connecting the air outlet of the compressed air pipe to the first outlet pipe 23; opening the second valve 32, and injecting compressed air into the compressed air pipe by the compressed air source 41 at a preset flow rate.

[0060] In the second operating state, closing the first valve 22 can prevent the first acid mist control unit 2 from causing gas interference to the first gas outlet pipe 23 and the second gas outlet pipe 33 downstream of the first valve 22, and at the same time avoid the gas reflux in the first gas outlet pipe 23. The compressed air source 41 injects compressed air into the compressed air pipe at a preset flow rate, and the compressed air generates gas flow between the downstream of the first valve 22 and the connection of the first gas outlet pipe 23 and the second gas outlet pipe 33, preventing the accumulation of silicon dioxide on the inner wall of the first gas outlet pipe 23 between the first valve 22 and the connection of the first gas outlet pipe 23 and the second gas outlet pipe 33. This preset flow rate does not need to be too large, as long as there is gas flow in the first gas outlet pipe 23. Specifically, it can be selected according to the pipe diameter of the first gas outlet pipe 23 and the flow rate of the combustion gas, and this embodiment does not limit it here.

[0061] Optionally, when the first acid mist control unit 2 or the second acid mist control unit 3 is in the operating state respectively, the temperature detection unit 5 detects the temperature of the combustion gas in the second gas outlet pipe 33, and the temperature of the combustion gas is higher than the temperature of the process gas discharged from the process gas cooler. That is to say, whether the acid mist control system is in the first operating state or the second operating state, it is necessary to detect the temperature of the combustion gas at the gas outlet of the second gas outlet pipe 33 through the temperature detection unit 5. Only when the temperature of the combustion gas at the gas outlet of the second gas outlet pipe 33 is always slightly higher than the temperature of the process gas in the process gas pipe 1 can it be ensured that the process gas in the process gas pipe 1 will not condense in advance due to the temperature difference, and thus the corrosion of the process gas pipe 1 by acidic droplets can be avoided.

[0062] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or variations can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Acid mist control system, characterized in that, Comprising: A process gas pipeline (1), configured to be connected between a process gas cooler and a WSA condenser; A first acid mist control unit (2), including a first combustion gas generating assembly, a first valve (22) and a first outlet pipe (23), the first outlet pipe (23) being connected to the first combustion gas generating assembly, and the first valve (22) being provided on the first outlet pipe (23); A second acid mist control unit (3), including a second combustion gas generating assembly, a second valve (32) and a second outlet pipe (33), the second outlet pipe (33) being connected to the second combustion gas generating assembly, the second valve (32) being provided on the second outlet pipe (33), the outlet end of the second outlet pipe (33) extending into and connected to the process gas pipeline (1), the first outlet pipe (23) being connected to the second outlet pipe (33) and being provided between the process gas pipeline (1) and the second valve (32); A compressed air injection assembly (4), including a compressed air source (41) and a compressed air pipe connected to each other, the outlet of the compressed air pipe being selectively connected to the first outlet pipe (23) or the second outlet pipe (33), and being provided at the outlet of the first valve (22) or the outlet of the second valve (32); The first acid mist control unit (2) and the second acid mist control unit (3) operate alternately.

2. The acid mist control system according to claim 1, wherein The compressed air pipe includes a first compressed air injection pipe (42) and a second compressed air injection pipe (43), the first compressed air injection pipe (42) being connected between the compressed air source (41) and the first outlet pipe (23), and the second compressed air injection pipe (43) being connected between the compressed air source (41) and the second outlet pipe (33).

3. The acid mist control system according to claim 2, wherein, The compressed air injection assembly (4) further includes a third valve (44), and the third valve (44) is provided on the first compressed air injection pipe (42).

4. The acid mist control system according to claim 2, wherein The compressed air injection assembly (4) further includes a fourth valve (45), and the fourth valve (45) is provided on the second compressed air injection pipe (43).

5. The acid mist control system according to claim 1, wherein, The acid mist control system further includes a temperature detection unit (5), and the temperature detection unit (5) is provided on one side of the second outlet pipe (33) close to the process gas pipeline (1) to detect the temperature of the combustion gas in the second outlet pipe (33).

6. The acid mist control system according to claim 1, wherein The first combustion gas generating assembly includes a first burner (211), a first mixer (212), a first gas pipeline (213), a first silicone oil pipeline (214), and a first air pipeline (215). The gas outlet of the first burner (211) is communicated with the first gas outlet pipe (23), the gas inlet of the first burner (211) is communicated with the outlet of the first mixer (212), the inlets of the first mixer (212) are respectively communicated with the first gas pipeline (213), the first silicone oil pipeline (214), and the first air pipeline (215). The first gas pipeline (213) is communicated with a first gas source (100), the first silicone oil pipeline (214) is communicated with a first silicone oil tank (200), and the first air pipeline (215) is communicated with a first blower (300).

7. The acid mist control system according to claim 1, wherein, The second combustion gas generating assembly includes a second burner (311), a second mixer (312), a second gas pipeline (313), a second silicone oil pipeline (314), and a second air pipeline (315). The gas outlet of the second burner (311) is communicated with the second gas outlet pipe (33), the gas inlet of the second burner (311) is communicated with the outlet of the second mixer (312), the inlets of the second mixer (312) are respectively communicated with the second gas pipeline (313), the second silicone oil pipeline (314), and the second air pipeline (315). The second gas pipeline (313) is communicated with a second gas source (400), the second silicone oil pipeline (314) is communicated with a second silicone oil tank (500), and the second air pipeline (315) is communicated with a second blower (600).

8. A method of using an acid mist control system, characterized in that When using the acid mist control system as described in any one of claims 1-7, when the first acid mist control unit (2) is in an operating state and the second acid mist control unit (3) is in a standby state, the usage method of the acid mist control system includes: Closing the second valve (32), and communicating the gas outlet of the compressed air pipe to the second gas outlet pipe (33); Opening the first valve (22), and injecting compressed air into the compressed air pipe from the compressed air source (41) at a preset flow rate.

9. The method for using the acid mist control system according to claim 8, wherein, When the second acid mist control unit (3) is in an operating state and the first acid mist control unit (2) is in a standby state, the usage method of the acid mist control system includes: Closing the first valve (22), and communicating the gas outlet of the compressed air pipe to the first gas outlet pipe (23); Opening the second valve (32), and injecting compressed air into the compressed air pipe from the compressed air source (41) at a preset flow rate.

10. The method of using the acid mist control system according to claim 8 or 9, characterized in that, When the first acid mist control unit (2) or the second acid mist control unit (3) is in an operating state respectively, the temperature of the combustion gas in the second gas outlet pipe (33) is detected by the temperature detection unit (5), and the temperature of the combustion gas is higher than the temperature of the process gas discharged from the process gas cooler.

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