Gas treatment system

Abstract

The utility model discloses a coal gas treatment system which is sequentially provided with a water washing tower and an electric coke catcher, coal gas is subjected to water washing and electric coke catching and then is filtered through a filter, so that tar which is not completely removed by the electric coke catcher and dust which is not washed away by the water washing tower in the coal gas are removed, and the situation that the operation efficiency of a compressor is reduced by the tar which is not removed is avoided; meanwhile, normal metabolism and growth of microorganisms in the fermenter are ensured.

Description

Technical Field

[0001] This invention relates to the field of industrial gas pretreatment technology, and more particularly to a coal gas treatment system. Background Technology

[0002] Currently, industrial waste gas is typically recovered and reused through combustion heating or power generation, which results in the emission of large amounts of pollutants such as CO2, SO2, and dust. However, by directly feeding industrial waste gas into a fermenter, where it is utilized by microorganisms and converted into liquid ethanol and microbial protein, emissions of CO2, SO2, and particulate matter caused by combustion can be effectively reduced, thus playing a positive role in environmental protection.

[0003] Before being sent to the fermenter, industrial exhaust gas usually undergoes water washing and electrostatic precipitator treatment. However, the existing water washing and electrostatic precipitator treatment processes cannot completely remove tar from the exhaust gas. The unremoved tar will reduce the operating efficiency of the compressor and also threaten the metabolic growth of microorganisms in the fermenter. Summary of the Invention

[0004] In view of the above problems, this application is made in order to provide a gas treatment system that overcomes or at least partially solves the above problems.

[0005] In a first aspect, a gas treatment system is provided, comprising: a water washing tower, an electrostatic precipitator, a filter, an inlet pipeline, a first on / off mechanism, an outlet pipeline, a fermenter, a second on / off mechanism, a compressor, and a control mechanism;

[0006] The filter includes a housing and a filter mechanism, with the filter mechanism housed within the housing.

[0007] The inlet of the air intake pipe is connected to the gas source, and the outlet is connected to the inlet of the housing;

[0008] The water washing tower, the electrostatic precipitator, and the first switching mechanism are sequentially installed in the air inlet pipeline;

[0009] The inlet of the gas outlet pipe is connected to the outlet of the box, and the outlet is connected to the fermenter;

[0010] The second on / off mechanism and the compressor are sequentially installed in the air outlet pipeline.

[0011] The control mechanism is electrically connected to the first on / off mechanism and the second on / off mechanism respectively, and is used to control the first on / off mechanism and the second on / off mechanism to close, so as to cut off the air intake pipe and the air outlet pipe, or to control the first on / off mechanism and the second on / off mechanism to open, so as to open the air intake pipe and the air outlet pipe.

[0012] Optionally, the gas treatment system also includes a cleaning device connected to the filter, and a control mechanism electrically connected to the cleaning device for controlling the cleaning device to clean the filter mechanism.

[0013] Optionally, the gas processing system may also include a differential pressure monitoring device;

[0014] The differential pressure monitoring device is connected to the inlet and outlet of the container respectively, and is used to detect the actual differential pressure between the inlet and outlet of the container.

[0015] The control mechanism is also electrically connected to the differential pressure monitoring mechanism to receive the actual differential pressure between the inlet and outlet of the housing sent by the differential pressure monitoring mechanism, and compare the actual differential pressure with the preset differential pressure. When it is determined that the actual differential pressure is greater than the preset differential pressure, the control mechanism controls the first on / off mechanism and the second on / off mechanism to close, and controls the cleaning device to clean the filter mechanism.

[0016] Optionally, the cleaning device includes a spray head, a cleaning fluid pipeline, and a third on / off mechanism;

[0017] The spray head is installed inside the housing and located above the filtration mechanism;

[0018] The inlet of the cleaning fluid pipeline is connected to the cleaning fluid source, and the outlet is connected to the spray head;

[0019] The third on / off mechanism is located in the cleaning fluid pipeline;

[0020] The control mechanism is electrically connected to the cleaning device and is used to control the cleaning device to clean the filter mechanism, including:

[0021] The control mechanism is electrically connected to the third on / off mechanism and is used to control the third on / off mechanism to open, so that the cleaning fluid in the cleaning fluid pipeline enters the tank through the spray head to clean the filter mechanism.

[0022] Optionally, the cleaning device may also include a waste discharge pipeline and a fourth on / off mechanism;

[0023] The inlet of the waste discharge pipe is connected to the bottom of the box;

[0024] The fourth switching mechanism is installed in the waste discharge pipeline;

[0025] The control mechanism is also electrically connected to the fourth switching mechanism, which is used to control the fourth switching mechanism to open to open the waste discharge pipeline, or to control the fourth switching mechanism to close to shut off the waste discharge pipeline.

[0026] Optionally, the gas treatment system also includes a replacement mechanism, which includes a first replacement pipeline, a fifth switching mechanism, a second replacement pipeline, and a sixth switching mechanism.

[0027] The inlet of the first replacement pipeline is connected to the replacement gas source, and the outlet is connected to the first connection point of the inlet pipeline. The first connection point is located between the first switching mechanism and the housing.

[0028] The fifth switching mechanism is located in the first replacement pipeline;

[0029] The inlet of the second replacement pipeline is connected to the second connection point of the outlet pipeline. The second connection point is located between the outlet of the housing and the second on / off mechanism.

[0030] The sixth switching mechanism is located in the second replacement pipeline;

[0031] The control mechanism is also electrically connected to the fifth and sixth on / off mechanisms, and is used to open the fifth and sixth on / off mechanisms after the first and second on / off mechanisms are closed and before the cleaning device cleans the filter mechanism, so as to perform gas replacement on the filter, and to close the fifth and sixth on / off mechanisms after the filter is gas replaced.

[0032] Optionally, the control mechanism is also used to control the fifth and sixth on / off mechanisms to open and dry the filter after the control cleaning device has cleaned the filter mechanism;

[0033] And before controlling the first and second switching mechanisms to open, control the fifth and sixth switching mechanisms to close.

[0034] Optionally, the inlet of the enclosure is located below the outlet of the enclosure.

[0035] Optionally, the gas treatment system may also include a purification mechanism, which is located in the gas outlet pipeline and between the compressor and the fermenter.

[0036] Optionally, the filtration mechanism includes multiple layers of screens.

[0037] Optionally, the gas treatment system also includes a secondary pipeline, the inlet of which is connected to a third connection point on the inlet pipeline, the third connection point being located between the electrostatic precipitator and the first switching mechanism; the outlet of the secondary pipeline is connected to a fourth connection point on the outlet pipeline, the fourth connection point being located between the second switching mechanism and the compressor.

[0038] The technical solution provided in this application has at least the following technical effects or advantages:

[0039] The gas treatment system provided in this application consists of a water washing tower and an electrostatic precipitator arranged sequentially. After the gas is washed with water and electrostatically precipitated, it is filtered through a filter to remove tar that was not completely removed by the electrostatic precipitator and dust that was not washed away by the water washing tower. This prevents the tar that was not removed from reducing the operating efficiency of the compressor, while ensuring the normal metabolic growth of microorganisms in the fermenter.

[0040] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0041] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0042] Figure 1 This is a wireframe diagram of the gas treatment system in an embodiment of this application;

[0043] Figure 2 This is a partial structure of the gas treatment system in the embodiments of this application. Figure 1 ;

[0044] Figure 3 This is a partial structure of the gas treatment system in the embodiments of this application. Figure 2 ;

[0045] Figure 4 This is a photograph of the multi-layer folded screen as described in the embodiments of this application;

[0046] Figure 5 This is a schematic diagram of a filter in an embodiment of this application. Detailed Implementation

[0047] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings.

[0048] The accompanying drawings illustrate various structural schematics according to embodiments of this application. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0049] To better understand the above technical solutions, the following will describe the above technical solutions in detail with reference to specific implementation methods. It should be understood that the embodiments of this disclosure and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.

[0050] Currently, industrial waste gas is typically recovered and reused through combustion heating or power generation, which releases large amounts of pollutants such as CO2, SO2, and dust. However, directly converting industrial waste gas into liquid ethanol and microbial protein can effectively reduce CO2, SO2, and particulate matter emissions from combustion, thus playing a positive role in environmental protection.

[0051] Ethanol production via coal gas fermentation is a new technology that uses carbon monoxide as a carbon source to produce ethanol through microbial fermentation. After distillation to extract ethanol, the fermentation wastewater contains a certain amount of microbial protein, which greatly increases the difficulty of wastewater treatment. At the same time, the microbial protein in the wastewater has a simple composition and high crude protein content, making it a high-value-added protein feed that can be widely used in aquaculture and livestock feeding. Microbial protein powder can replace a portion of fishmeal in the feed industry to reduce dependence on high-grade protein feeds for marine fish, which has significant environmental and economic benefits.

[0052] The raw gas from the ferroalloy plant undergoes a three-stage water scrubbing process in a water washing tower to remove dust and some tar. Then, it passes through an electrostatic precipitator with corona electrodes and a precipitation electrode, where it is ionized under high-voltage, oxygen-free electricity. Positively charged dust and tar particles migrate towards the electrodes, while negatively charged tar particles move towards the electrode tube wall, forming large droplets that flow by gravity to the tar collection pipe for collection. The purified gas is then adiabatically compressed and pressurized in a centrifuge, and further processed through temperature-switching adsorption for dust, tar, and benzene / naphthalene removal, followed by hydrolysis detoxification and molybdenum-based deoxygenation, ultimately providing qualified raw gas for the fermentation system.

[0053] However, in the feed gas treatment process of the new coal gas fermentation to ethanol production process, the feed gas treatment unit has limited capacity to handle tar. Tar carried in the feed gas enters the centrifugal compressor, adsorbs onto the impeller, and gradually accumulates, causing abnormal operation of the centrifugal compressor. Therefore, the current method of using a water scrubbing tower to remove a small portion of the tar and an electrostatic precipitator to remove most of the tar by high-voltage ionization cannot meet the stable operation requirements of the feed gas pretreatment, seriously endangering the metabolic growth of fermentation microorganisms.

[0054] In view of this, this application provides a gas processing system, please refer to... Figure 1 , Figure 1 This is a wireframe diagram of the gas treatment system in an embodiment of this application.

[0055] The gas treatment system 100 provided in this application embodiment includes: a water washing tower 101, an electrostatic precipitator 102, a filter 103, an inlet pipe 104, a first on / off mechanism 105, an outlet pipe 106, a fermenter 107, a second on / off mechanism 108, a compressor 109, and a control mechanism 110.

[0056] The filter 103 includes a housing 1031 and a filter mechanism 1032, which is disposed inside the housing 1031. The inlet of the air inlet pipe 104 is connected to a gas source, and the outlet is connected to the inlet of the housing 1031. The water washing tower 101, the electrostatic precipitator 102, and the first on / off mechanism 105 are sequentially disposed in the air inlet pipe 104. The inlet of the air outlet pipe 106 is connected to the outlet of the housing 1031, and the outlet is connected to the fermenter 107. The second on / off mechanism 108 and the compressor 109 are sequentially disposed in the air outlet pipe 106.

[0057] The control mechanism 110 is electrically connected to the first on / off mechanism 105 and the second on / off mechanism 108 respectively, and is used to control the first on / off mechanism 105 and the second on / off mechanism 108 to close, so as to cut off the air intake pipe 104 and the air outlet pipe 106, or to control the first on / off mechanism 105 and the second on / off mechanism 108 to open, so as to connect the air intake pipe 104 and the air outlet pipe 106.

[0058] The gas treatment system provided in this application embodiment involves gas being washed by a three-stage spray system in a water washing tower 101 to remove dust and some tar. The gas then passes through an electrostatic precipitator 102, where the corona electrode and the precipitation electrode are ionized under high-voltage, oxygen-free electricity. Positively charged dust and tar particles move towards the electrodes, while negatively charged tar particles move towards the electrode tube wall, forming large droplets. These droplets then flow by gravity to the tar collection pipe for collection. Finally, the gas passes through a filtration mechanism 1032 for tar adsorption and dust removal, ultimately providing qualified raw material gas for the fermentation bacteria in the fermenter 107.

[0059] When there is a lot of tar and dust in the filter mechanism 1032, the control mechanism 110 controls the first on / off mechanism 105 and the second on / off mechanism 108 to disconnect in order to clean the filter mechanism 1032. Finally, the control mechanism 110 controls the first on / off mechanism 105 and the second on / off mechanism 108 to open to restore the process.

[0060] The first on / off mechanism 105 and the second on / off mechanism 108 can be double-sealed triple-eccentric electric butterfly valves or other types of solenoid valves, which will not be elaborated here.

[0061] In some alternative implementations, it remains as follows Figure 1 As shown, the gas treatment system also includes a cleaning device 111, which is connected to the filter 103. The control mechanism 110 is electrically connected to the cleaning device 111 and is used to control the cleaning device 111 to clean the filter mechanism 1032.

[0062] When there is a large amount of tar and dust in the filter mechanism 1032, the control mechanism 110 controls the first on / off mechanism 105 and the second on / off mechanism 108 to disconnect, cutting off the transmission of gas. This allows the cleaning device 111 to clean the filter mechanism 1032. This is beneficial for the stable operation of the entire gas pretreatment section, protecting the normal operation of the core equipment compressor 109; moreover, it greatly helps to improve the fermentation strains, creating economic benefits.

[0063] In some alternative implementations, such as Figure 2 As shown, the cleaning device 111 includes a spray head 201, a cleaning fluid pipeline 202, and a third on / off mechanism 203. The spray head 201 is disposed inside the housing 1031 and located above the filter mechanism 1032. The inlet of the cleaning fluid pipeline 202 is connected to the cleaning fluid source, and the outlet is connected to the spray head 201. The third on / off mechanism 203 is disposed in the cleaning fluid pipeline 202. It can be understood that the control mechanism 110 is also electrically connected to the third on / off mechanism 203 to control the third on / off mechanism 203 to open, so that the cleaning fluid in the cleaning fluid pipeline 202 enters the housing 1031 through the spray head 201 to clean the filter mechanism 1032.

[0064] For example, still as Figure 2 As shown, the cleaning fluid source is a cleaning fluid tank 207 containing cleaning fluid. A cleaning fluid pump is installed on the cleaning fluid pipeline 202. The control mechanism 110 is electrically connected to the cleaning fluid pump 208 to control the start of the cleaning fluid pump, so as to send the cleaning fluid in the cleaning fluid tank to the spray head 201 through the cleaning fluid pipeline 202.

[0065] In some alternative implementations, it remains as follows Figure 2 As shown, the gas treatment system also includes a differential pressure monitoring mechanism 204; the differential pressure monitoring mechanism 204 is connected to the inlet and outlet of the housing 1031 respectively, and is used to detect the actual differential pressure between the inlet and outlet of the housing 1031.

[0066] The control mechanism 110 is also electrically connected to the differential pressure monitoring mechanism 204 to receive the actual differential pressure between the inlet and outlet of the housing 1031 sent by the differential pressure monitoring mechanism 204. Specifically, it detects the differential pressure between the inlet pipe 104 and the outlet pipe 106. The control mechanism 110 compares the actual differential pressure with the preset differential pressure. When the actual differential pressure is greater than the preset differential pressure, it controls the first on / off mechanism 105 and the second on / off mechanism 108 to close, and controls the cleaning device 111 to clean the filter mechanism 1032. Tar and dust adhering to the filter mechanism 1032 increase the resistance of gas passing through the filter 103. When the actual differential pressure is greater than the preset differential pressure, it indicates that the accumulation of tar and dust has reached a level that affects the normal transmission of gas and reduces the filtering function of the filter 103. At this time, closing the first on / off mechanism 105 and the second on / off mechanism 108 cuts off the transmission of gas, thereby controlling the cleaning device 111 to clean the filter mechanism 1032.

[0067] In some alternative implementations, it remains as follows Figure 2 As shown, the cleaning device 111 also includes a waste discharge pipe 205 and a fourth on / off mechanism 206; the inlet of the waste discharge pipe 205 is connected to the bottom of the housing 1031; the fourth on / off mechanism 206 is disposed in the waste discharge pipe 205.

[0068] Understandably, the control mechanism 110 is also electrically connected to the fourth on / off mechanism 206, which is used to control the fourth on / off mechanism 206 to open, so as to conduct the waste discharge pipe 205 to discharge the waste liquid in the tank 1031, or to control the fourth on / off mechanism 206 to close, so as to cut off the waste discharge pipe 205.

[0069] The third on / off mechanism 203 and the fourth on / off mechanism 206 can be double-sealed triple-eccentric electric butterfly valves or other types of solenoid valves, which will not be elaborated here.

[0070] For example, a waste liquid collection tank 209 is provided on the waste discharge pipeline 205, and a waste pump 210 is provided on the waste discharge pipeline 205. The control mechanism 110 is electrically connected to the waste liquid pump and controls the start of the cleaning liquid pump to send the waste liquid in the waste liquid collection tank to the ferroalloy high-temperature calcining furnace for treatment through the waste discharge pipeline 205.

[0071] Understandably, pressure gauges 211 are also installed in the inlet pipe 104 and the outlet pipe 106 respectively to detect and display the real-time pressure of the inlet pipe 104 and the outlet pipe 106, so that operators can judge whether the gas treatment system 100 is operating normally.

[0072] In some alternative implementations, such as Figure 3As shown, the gas treatment system also includes a replacement mechanism, which comprises a first replacement pipeline 301, a fifth switching mechanism 302, a second replacement pipeline 303, and a sixth switching mechanism 304. The inlet of the first replacement pipeline 301 is connected to the replacement gas source, and the outlet is connected to the first connection point of the inlet pipeline 104, which is located between the first switching mechanism 105 and the housing 1031. The fifth switching mechanism 302 is located in the first replacement pipeline 301. The inlet of the second replacement pipeline 303 is connected to the second connection point of the outlet pipeline 106, which is located between the outlet of the housing 1031 and the second switching mechanism 108. The sixth switching mechanism 304 is located in the second replacement pipeline 303.

[0073] For example, the fifth switching mechanism 302 includes two or more pneumatic valves, the sixth switching mechanism 304 includes two or more pneumatic valves, or other types of solenoid valves, which will not be described in detail here.

[0074] Understandably, the control mechanism 110 is also electrically connected to the fifth switching mechanism 302 and the sixth switching mechanism 304, for opening the fifth switching mechanism 302 and the sixth switching mechanism 304 to perform gas replacement on the filter 103 after the first switching mechanism 105 and the second switching mechanism 108 are closed and before the cleaning device 111 cleans the filter mechanism 1032, and for closing the fifth switching mechanism 302 and the sixth switching mechanism 304 after the filter 103 is gas replaced.

[0075] When the filter mechanism 1032 needs cleaning, the first on / off mechanism 105 and the second on / off mechanism 108 are closed. There is gas in the filter 103. The fifth on / off mechanism 302 and the sixth on / off mechanism 304 are opened to open the first replacement pipeline 301. The replacement gas enters the inlet pipeline 104 and the filter 103 through the first connection point. At the same time, the replacement gas is discharged from the second replacement pipeline 303, carrying away the gas in the filter 103, thus completing the replacement. The control mechanism 110 controls the fifth on / off mechanism 302 and the sixth on / off mechanism 304 to close, which in turn controls the third on / off mechanism 203 and the fourth on / off mechanism 206 to open, so as to clean the filter mechanism 1032.

[0076] In some alternative embodiments, the control mechanism 110 is also used to control the fifth on / off mechanism 302 and the sixth on / off mechanism 304 to open and dry the filter 103 after the control cleaning device 111 has cleaned the filter mechanism 1032; and to control the fifth on / off mechanism 302 and the sixth on / off mechanism 304 to close before the control of the first on / off mechanism 105 and the second on / off mechanism 108 are opened.

[0077] In some alternative implementations, it remains as follows Figure 1As shown, the gas treatment system also includes a purification mechanism 112, which is installed in the gas outlet pipeline 106 and located between the compressor 109 and the fermenter 107.

[0078] The purification unit 112 is used to finely purify the coal gas after it has been treated by the water washing tower 101, the electrostatic precipitator 102, and the filter 103. It mainly performs targeted purification based on the survival conditions of the fermentation bacteria in the fermenter 107. For example, the purification unit 112 removes substances that the bacteria cannot tolerate, such as SO2, benzene, naphthalene, and oxygen. Specific operations can include hydrolysis detoxification, molybdenum-based deoxygenation, etc.

[0079] In some alternative implementations, it remains as follows Figure 3 As shown, the gas treatment system also includes a secondary pipeline 305 and a seventh switching mechanism 306. The inlet of the secondary pipeline 305 is connected to a third connection point on the inlet pipeline 104, which is located between the electrostatic precipitator 102 and the first switching mechanism 105. The outlet of the secondary pipeline 305 is connected to a fourth connection point on the outlet pipeline 106, which is located between the second switching mechanism 108 and the compressor 109. The seventh switching mechanism 306 is located in the secondary pipeline 305.

[0080] It is understood that the control mechanism 110 is electrically connected to the seventh on / off mechanism 306 and is used to control the opening and closing of the seventh on / off mechanism 306. When the passage where the filter 103 is located needs to be shut down for maintenance or replacement of parts, the gas delivered by the electrostatic precipitator 102 is transmitted through the auxiliary pipeline 305 to ensure continuous operation of the system.

[0081] In some alternative embodiments, the filtration mechanism 1032 includes multiple layers of screens, such as... Figure 4 The multi-layered folded screen shown. The housing 1031 can be made as follows: Figure 5 The rectangular screen box shown has its inlet located below the outlet of the box body 1031. The gas enters the box body 1031 through the inlet, passes through multiple layers of folded screens for filtration along an upward path, and then exits through the outlet of the box body 1031. The gas moves from top to bottom within the box body 1031. The cleaning liquid delivered by the spray head 201 flows upward within the box body 1031, thereby rinsing the multiple layers of folded screens in the opposite direction to the gas movement. This ensures that the rinsing liquid completely enters the multiple layers of folded screens, completely removing the tar and dust deposited on the multiple layers of folded screens.

[0082] The control mechanism 110 can adopt a DCS control program and be applied to the gas treatment system provided in the above embodiment. The specific operation for gas treatment is as follows:

[0083] When the gas enters the filter 103, some of the tar will be intercepted by the screen, i.e., the filter mechanism 1032, and will adhere to the screen, causing the pressure difference between the two ends to increase, triggering the following sequence of actions in DCS program 1:

[0084] The seventh switching mechanism 306 of the secondary pipeline 305 opens, the first switching mechanism 105 closes, and the second switching mechanism 108 closes. Gas is switched from the main line where the filter 103 is located to the secondary pipeline 305. After the first switching mechanism 105 and the second switching mechanism 108 close, the DCS program 2 is triggered after a 30-second delay, and the following sequential actions are performed:

[0085] The two pneumatic valves of the fifth on / off mechanism 302 are opened, the pneumatic valve of the sixth on / off mechanism 304 is opened, the opening degree setting value is 60% (the opening degree of the regulating valve can be changed in the DCS system, the change range is 50%-100%), the other pneumatic valve of the sixth on / off mechanism 304 is opened, and the nitrogen purging is automatically timed for 30 minutes (the replacement time setting value can be modified in the DCS system).

[0086] After the automatic nitrogen purging is completed, the pneumatic valves of the fifth on / off mechanism 302 and the sixth on / off mechanism 304 are closed, triggering the following sequential actions of DCS program 3:

[0087] The third switching mechanism 203 and the fourth switching mechanism 206 are opened, with the opening set at 60% (the opening of the regulating valve can be changed in the DCS system, with a change range of 50%-100%). The cleaning fluid pump starts to deliver cleaning fluid (the left and right hand valves of the cleaning pump are normally open, the mechanical seal water is always open, and the cleaning fluid tank always has a sufficient amount of cleaning fluid). The tar cleaning is automatically timed for 20 minutes (the cleaning time setpoint can be modified in the DCS system).

[0088] After the automatic tar cleaning is completed, the cleaning fluid pump starts and stops, and the third on / off mechanism 203 and the fourth on / off mechanism 206 are closed after a delay of 120 seconds. The upstream ferroalloy can be contacted according to the actual liquid level to start the waste liquid pump and send the waste liquid in the waste liquid collection tank to be calcined.

[0089] After the automatic tar cleaning is completed, the relevant valves are closed, the third on / off mechanism 203 and the fourth on / off mechanism 206 close with a 30-second delay, triggering the second sequential action of DCS program 2.

[0090] When the automatic nitrogen purging is completed and the relevant valves are closed, the fifth on / off mechanism 302 and the sixth on / off mechanism 304 close with a 30-second delay, triggering the following sequential actions of DCS program 4:

[0091] The first switching mechanism 105 is opened, the seventh switching mechanism 306 is closed, the auxiliary line is switched to the main line, and the gas treatment system 100 is restored to operation.

[0092] In summary, the gas treatment system proposed in this application improves the tar treatment capacity of the raw gas pretreatment unit to a certain extent, ensuring stable production operation.

[0093] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this application may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

Claims

1. A gas processing system, characterized in that, include: Filter, air inlet pipe, water washing tower, electrostatic precipitator, first on / off mechanism, air outlet pipe, fermenter, second on / off mechanism, compressor, control mechanism; The filter includes a housing and a filtering mechanism, wherein the filtering mechanism is disposed within the housing; The inlet of the air intake pipe is connected to the gas source, and the outlet is connected to the inlet of the housing; The water washing tower, the electrostatic precipitator, and the first switching mechanism are sequentially arranged in the air inlet pipeline; The inlet of the gas outlet pipe is connected to the outlet of the box, and the outlet is connected to the fermenter; The second on / off mechanism and the compressor are sequentially arranged in the air outlet pipeline; The control mechanism is electrically connected to the first switching mechanism and the second switching mechanism, respectively.

2. The gas treatment system as described in claim 1, characterized in that, The gas treatment system also includes a cleaning device, which is connected to the filter, and the control mechanism is electrically connected to the cleaning device.

3. The gas treatment system as described in claim 2, characterized in that, The gas treatment system also includes a differential pressure monitoring device; The differential pressure monitoring mechanism is connected to the inlet and outlet of the housing, respectively. The control mechanism is also electrically connected to the differential pressure monitoring mechanism.

4. The gas treatment system as described in claim 2, characterized in that, The cleaning device includes a spray head, a cleaning fluid pipeline, and a third on / off mechanism; The spray head is disposed inside the housing and located above the filtration mechanism; The inlet of the cleaning fluid pipeline is connected to the cleaning fluid source, and the outlet is connected to the spray head; The third on / off mechanism is located in the cleaning fluid pipeline.

5. The gas treatment system as described in claim 2, characterized in that, The cleaning device also includes a waste discharge pipeline and a fourth on / off mechanism; The inlet of the waste discharge pipe is connected to the bottom of the box; The fourth switching mechanism is provided in the waste discharge pipeline; The control mechanism is also electrically connected to the fourth switching mechanism.

6. The gas treatment system as described in claim 1, characterized in that, The gas treatment system also includes a replacement mechanism, which includes a first replacement pipeline, a fifth switching mechanism, a second replacement pipeline, and a sixth switching mechanism. The inlet of the first replacement pipeline is connected to the replacement gas source, and the outlet is connected to the first connection point of the inlet pipeline. The first connection point is located between the first switching mechanism and the housing. The fifth switching mechanism is disposed in the first replacement pipeline; The inlet of the second replacement pipeline is connected to the second connection point of the outlet pipeline, and the second connection point is located between the outlet of the housing and the second on / off mechanism; The sixth switching mechanism is disposed in the second replacement pipeline; The control mechanism is also electrically connected to the fifth switching mechanism and the sixth switching mechanism.

7. The gas treatment system as described in claim 1, characterized in that, The inlet of the box is located below the outlet of the box.

8. The gas treatment system as described in claim 1, characterized in that, The gas treatment system also includes a purification mechanism, which is installed in the gas outlet pipeline and located between the compressor and the fermenter.

9. The gas treatment system as described in claim 1, characterized in that, The filtration mechanism includes multiple layers of screens.

10. The gas treatment system as described in claim 1, characterized in that, The gas treatment system further includes a secondary pipeline and a seventh switching mechanism. The inlet of the secondary pipeline is connected to a third connection point on the inlet pipeline, which is located between the electrostatic precipitator and the first switching mechanism. The outlet of the secondary pipeline is connected to a fourth connection point on the outlet pipeline, which is located between the second switching mechanism and the compressor. The seventh switching mechanism is located on the secondary pipeline, and the control mechanism is electrically connected to the seventh switching mechanism.

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