Efficient integrated pretreatment system

Abstract

The utility model discloses an efficient integrated pretreatment system, which relates to the technical field of automatic temperature control devices and comprises a visible washing tank, a two-way needle valve is arranged at the bottom of the visible washing tank, a gas-liquid separator is communicated with the side surface of the visible washing tank, a pretreatment cabinet is arranged on the outer side of a pretreatment cabinet, and a gas-liquid separator is communicated with the gas-liquid separator. The side face of the gas-liquid separator is communicated with the membrane filter through the adjustable flow meter, the zero-point gas switching loop is arranged on the side face of the silica gel tank, by means of the pretreatment system, the replacement number of pressure reducing valves is reduced, the maintenance cost is saved, meanwhile, the liquid level is convenient to adjust through the visual water washing tank, the water washing effect is improved, and the water washing efficiency is improved. The pretreatment system is relatively high in desulfurization and sealing performance, the leakage rate of equipment is reduced, and meanwhile, the risk of pollution of a gas chamber of an online analyzer is reduced. Two paths of switchable desulfurization tanks are adopted, so that continuous and uninterrupted online measurement and online desulfurization agent replacement are realized.

Description

Technical Field

[0001] This utility model relates to the field of automatic temperature control device technology, and in particular to a high-efficiency integrated pretreatment system. Background Technology

[0002] Pretreatment device for the online gas analyzer of coal gasification unit 16 The main processing unit handles sample gas from the scrubbing tower outlet. The process sample gas temperature is 167℃, and the pressure is 3.8MPa. The main components of the sample gas are CH4, CO, CO2, H2, O2, tar, dust, and ammonia nitrogen. The long-term, stable operation of the online syngas analyzer in the coal gasification unit hinges on the efficiency and reliability of the sample gas pretreatment system. Based on the characteristics of the coal gasification syngas sample, the pretreatment system must perform pressure reduction, cooling, water removal, dust removal, and removal of byproducts that affect measurements, ensuring the sample gas meets the gas cleanliness requirements of the online analyzer. Unit 16 of coal gasification Pre-processing device for online body analyzer Since its commissioning in 2007, the pretreatment system has been inadequate, resulting in problems such as blocked sampling pipelines, poor sample gas sealing, damage to sample gas pressure reducing valves, and excessive sulfur content in sample gas leading to contamination and damage to the gas chamber. These issues are key factors affecting the safe and stable operation of the analytical instruments.

[0003] The current sample gas pretreatment system consists of on-site pretreatment and sample gas pretreatment in the analysis cabin. Its flowchart and physical diagram are shown below. Figure 1 and Figure 2 The pre-treatment process mainly involves sampling from the pipeline on-site, passing through a switch valve into a cooler, then through a water-vapor separator, and finally into a T-type filter. After preliminary filtration, the pressure is reduced to 0.3 MPa by a pressure reducing valve before being sent to the sample gas pre-treatment device in the analysis cabin. The sample gas then enters a desulfurization tank to remove H2S, followed by a water washing tank to remove the desulfurizing agent. After passing through a 0.5 μm precision T-type filter, the pre-filtered sample gas passes through a gas-liquid separator to remove moisture, then uses a vortex cooler to lower the dew point, and finally passes through a second T-type filter, using a rotor flow meter. The process involves controlling the flow rate of sample gas into the analytical instrument to complete the sample gas composition analysis. During operation, several issues arise: First, the high ammonia nitrogen content in the sample gas can easily clog the sampling pipeline, including the pre-treatment stage, and the sample gas pressure reducing valve is prone to blockage and damage. Second, poor sealing of the pipelines connecting to the desulfurization tank and water washing tank can easily lead to sample gas leakage, resulting in toxic gases in the sample gas and posing a safety hazard. Third, the water in the desulfurization tank and water washing tank is replaced periodically; when the sulfur content in the sample gas is high, inadequate desulfurization can lead to contamination and damage to the gas chamber. Fourth, the entire pre-treatment process involves excessively long pipelines, causing data lag and affecting measurement results. Utility Model Content

[0004] The purpose of this invention is to provide a highly efficient integrated pretreatment system to address the shortcomings of existing sample gas pretreatment systems, which consist of on-site pretreatment and in-analytical sample gas pretreatment. A flowchart and physical diagram are provided below. Figure 1 and Figure 2 The pre-treatment process mainly involves sampling from the pipeline on-site, passing through a switch valve into a cooler, then through a water-vapor separator, and finally into a T-type filter. After preliminary filtration, the pressure is reduced to 0.3 MPa by a pressure reducing valve before being sent to the sample gas pretreatment device in the analysis cabin. The sample gas then enters a desulfurization tank to remove H2S, and then enters a water washing tank to remove the desulfurizing agent. After passing through a 0.5 μm precision T-type filter, the pre-filtered sample gas passes through a gas-liquid separator to remove moisture, then uses a vortex cooler to lower the dew point, and finally passes through a second T-type filter, controlled by a rotor flow meter. The flow rate of the sample gas entering the analytical instrument completes the sample gas composition analysis. During use, firstly, due to the high ammonia nitrogen content in the sample gas, it is easy to clog the sampling pipeline, including the pretreatment stage, and the sample gas pressure reducing valve is prone to blockage and damage; secondly, due to the poor sealing of the pipelines connected to the desulfurization tank and water washing tank, sample gas leakage is likely to occur, and the sample gas contains toxic gases, posing a safety hazard; thirdly, the water in the desulfurization tank and water washing tank is changed regularly, and when the sulfur content of the sample gas is high, the desulfurization effect is inadequate, which can lead to contamination and damage to the gas chamber; fourthly, the entire pretreatment process pipeline is too long, causing analytical data lag and affecting the measurement results.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a high-efficiency integrated pretreatment system, including a visible water washing tank, a two-way needle valve at the bottom of the visible water washing tank, and a gas-liquid separator connected to the side of the visible water washing tank. A pretreatment cabinet is located outside the visible water washing tank, and the side of the pretreatment cabinet is connected to a pretreatment cabinet via a steam inlet tank. A desulfurization tank and a silica gel tank are respectively located inside the pretreatment cabinet. A linear filter is located on the side of the desulfurization tank, and a bypass filter is located on the side of the linear filter. The side of the desulfurization tank is connected to a pressure reducing valve body... The gas-liquid separator is connected, and the side of the desulfurization tank is connected to a safety discharge port and an instrument air port via a safety valve and an air filter pressure reducing valve, respectively. The side of the gas-liquid separator is connected to a membrane filter via an adjustable flow meter. The side of the silica gel tank is equipped with a zero-point gas switching circuit. Using this pretreatment system reduces the number of pressure reducing valve replacements, saving maintenance costs. Simultaneously, the visible water washing tank facilitates liquid level adjustment, improves the water washing effect, and reduces the dust content of the sample gas. This pretreatment system has high sealing performance, reducing equipment leakage rate and the risk of contamination of the online analyzer's gas chamber. The use of two switchable desulfurization tanks enables continuous, uninterrupted online measurement and online replacement of the desulfurizing agent.

[0006] As a preferred technical solution of this utility model, a T-type filter and an electric heating pressure reducing valve are provided between the visible water washing tank and the gas-liquid separator.

[0007] As a preferred technical solution of this utility model, the bottom of the visible water washing tank is connected to a washing water inlet via a two-way ball valve; advanced facilities such as an electric heating pressure reducing valve, a temperature controller, a visible water washing device, and a precision membrane filter are included; and measures such as a two-way switchable desulfurization device, four-way sample gas output, and shared zero-point gas calibration are adopted; finally, the pre-treatment and sample gas pre-treatment in the analysis cabin are integrated separately, and reliable sealing technology is used to avoid sample gas leakage. Due to the high degree of integration, the sample gas pipeline is shortened and data lag is reduced.

[0008] As a preferred technical solution of this utility model, the inside of the pretreatment cabinet is connected to a drain outlet via a gas-liquid separator and an automatic drain tank.

[0009] As a preferred embodiment of this utility model, the silicone tank is connected to a flow meter via a three-way ball valve.

[0010] As a preferred embodiment of this utility model, the bypass filter is provided with a vortex cooler on its side.

[0011] As a preferred embodiment of this utility model, the desulfurization tank is connected to a fast return port via a one-way valve.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] This invention employs advanced facilities such as an electric heating pressure reducing valve, a temperature controller, a visible water washing device, and a precision membrane filter; it also adopts measures such as a two-way switchable desulfurization device, four-way sample gas output, and a shared zero-point gas calibration; finally, the pre-treatment stage and the sample gas pre-treatment stage in the analysis cabin are integrated separately, and reliable sealing technology is used to prevent sample gas leakage. Due to the high degree of integration, the sample gas pipeline is shortened and the data lag is reduced.

[0014] This invention reduces the number of pressure-reducing valve replacements and saves on maintenance costs by using this pretreatment system. The visible water washing tank facilitates liquid level adjustment, improves the washing effect, and reduces dust content in the sample gas. The pretreatment system features high sealing performance for desulfurization, reducing equipment leakage and the risk of contamination in the online analyzer's gas chamber. The use of two switchable desulfurization tanks enables continuous, uninterrupted online measurement and online replacement of the desulfurizing agent. Attached Figure Description

[0015] Figure 1 This is a structural system diagram of the present invention;

[0016] Figure 2 This is a structural pre-processing cabinet diagram of the present invention;

[0017] Figure 3 This is a structural pre-processing cabinet diagram of this utility model.

[0018] In the diagram: 1. Two-way ball valve; 2. Gas-liquid separator; 3. Automatic drain tank; 4. T-type filter; 5. Electric heating pressure reducing valve; 6. Visible water washing tank; 7. Two-way needle valve; 8. Pretreatment cabinet; 9. Pressure reducing valve body; 10. Safety valve; 11. Air filter pressure reducing valve; 12. Vortex cooler; 13. Linear filter; 14. Three-way ball valve; 15. Desulfurization tank; 16. Silica gel tank; 17. Flow meter body; 18. Adjustable flow meter; 19. Pretreatment cabinet; 20. Bypass filter; 21. Check valve; 22. Membrane filter; 23. Zero-point gas switching circuit. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 This utility model provides a high-efficiency integrated pretreatment system, including a visible water washing tank 6. A two-way needle valve 7 is provided at the bottom of the visible water washing tank 6, and a gas-liquid separator 2 is connected to the side of the visible water washing tank 6. A pretreatment cabinet 8 is provided on the outside of the visible water washing tank 6. A pretreatment cabinet 19 is connected to the side of the pretreatment cabinet 8 via a steam inlet tank. A desulfurization tank 15 and a silica gel tank 16 are respectively provided on the inside of the pretreatment cabinet 19. A linear filter 13 is provided on the side of the desulfurization tank 15, and a bypass filter 20 is provided on the side of the linear filter 13. The side of the desulfurization tank 15 is connected to the gas-liquid separator 2 via a pressure reducing valve body 9. The desulfurization tank 15 is connected to a safety discharge port and an instrument air port via a safety valve 10 and an air filter pressure reducing valve 11, respectively. The gas-liquid separator 2 is connected to a membrane filter 22 via an adjustable flow meter 18. The silica gel tank 16 has a zero-point gas switching circuit 23 on its side. Using this pretreatment system reduces the number of pressure reducing valve replacements, saving maintenance costs. The visible water washing tank 6 facilitates liquid level adjustment, improves the washing effect, and reduces dust content in the sample gas. This pretreatment system has high sealing performance, reducing equipment leakage and the risk of contamination in the online analyzer's gas chamber. The use of two switchable desulfurization tanks 15 enables continuous, uninterrupted online measurement and online replacement of the desulfurizing agent.

[0021] A T-type filter 4 and an electric heating pressure reducing valve 5 are installed between the visible water washing tank 6 and the gas-liquid separator 2. The bottom of the visible water washing tank 6 is connected to the washing water inlet through a two-way ball valve 1. Advanced facilities such as the electric heating pressure reducing valve 5, temperature controller, visible water washing device, and precision membrane filter 22 are provided. Measures such as two-way switchable desulfurization device, four-way sample gas output, and shared zero-point gas calibration are adopted. Finally, the pre-treatment and sample gas pre-treatment in the analysis cabin are integrated separately. Reliable sealing technology is used to avoid sample gas leakage. Due to the high integration, the sample gas pipeline is shortened and the data lag is reduced. The inside of the pre-treatment cabinet 19 is connected to the drain outlet through the gas-liquid separator 2 and the automatic drain tank 3.

[0022] The silica gel tank 16 is connected to the flow meter body 17 through the three-way ball valve 14. The bypass filter 20 is equipped with a vortex cooler 12 on its side. The desulfurization tank 15 is connected to the fast return port through the one-way valve 21.

[0023] In practical use, the analyzer's pretreatment system employs a highly efficient integrated pretreatment system. The key innovation lies in the use of advanced facilities such as an electrically heated pressure reducing valve 5, a temperature controller, a visible water washing device, and a precision membrane filter 22. It also incorporates a two-way switchable desulfurization device, four sample gas outputs, and a shared zero-point gas calibration. Finally, the pretreatment stage and the sample gas pretreatment within the analysis cabin are integrated, utilizing reliable sealing technology to prevent sample gas leakage. Due to this high integration, the sample gas pipeline is shortened, reducing data lag. Specifically, the sample gas first enters an 800x250x1000 stainless steel double-layer heat-traced insulated box through a sampling pipe, then passes through a Φ6 two-way valve into a gas-liquid separator (interface specification NPT1 / 2). After preliminary separation in the gas-liquid separator, some moisture enters a visible drain tank and is discharged through the process drain. The sample gas then undergoes preliminary filtration through a T-type corundum filter (interface specification NPT1 / 4”, filtration accuracy 0.2um) before passing through an electrically heated pressure reducing valve 5 (interface specification G3 / 4). After depressurization, the liquid enters the visible water washing tank 6 (gas inlet / outlet specification NPT1 / 4”, liquid inlet / outlet specification G1 / 2”). After initial treatment, the sample gas enters a 1200x250x800 stainless steel double-layer heat-traced insulation box and then enters a gas-liquid separator (interface specification NPT1 / 2) through a Φ6 two-way valve. The sample gas after water washing is separated (the water enters a visible drain tank, and the water removed by the vortex cooler 12 is discharged into the process drain). After pressure stabilization by a pressure reducing valve, part of the gas is discharged into the flare, and part of the sample gas passes through the vortex cooler 12 for cooling and dehydration. The dehydrated sample gas then enters a T-type alumina filter for dust filtration, forming a rapid loop. Part of the sample gas is discharged into the flare, and the other part passes through a T-type linear filter 13 to remove tar. It is then switched to a desulfurization tank 15 through a Φ6 three-way valve to remove H2S. The desulfurized sample gas enters a silica gel tank 16 to test the desulfurization effect and remove water again. Finally, it passes through a Φ6 three-way valve and enters a rotor flow meter. After flow adjustment, it passes through a 0.A 2µm membrane filter 22 is used, and the sample gas is then analyzed by the analyzer. The optimized pretreatment system uses an electrically heated pressure reducing valve 5 to control the sample gas temperature, solving the problem of ammonia nitrogen crystallization clogging and preventing damage to the pressure reducing valve. A visible water washing tank 6 is used to wash away dust and other impurities in the sample gas, and the water washing level can be adjusted intuitively to prevent the water level from being too high and bringing liquid into the pretreatment system, ensuring the stability of the pretreatment system. In the optimized pretreatment system, the desulfurization tank 15 uses a three-way valve for switching. After one desulfurizing agent is saturated with H2S, desulfurization is carried out without stopping the gas flow. The replacement of reagents enables continuous online monitoring, improving the stability and accuracy of the online analyzer. The optimized pretreatment system allows for the calibration of four online analyzers using a single zero-point sample gas, reducing the number of spare parts required and saving costs. This highly efficient integrated pretreatment system is particularly useful for the gas pretreatment system of the 16-unit online analyzer. After processing by this system, the purity of the sample gas is further improved, extending the service life of the online analyzer. It offers excellent economic benefits, enhances the stability of the online analyzer, and has high practicality.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-efficiency integrated pretreatment system, comprising a visible water washing tank (6), characterized in that: The bottom of the visible water washing tank (6) is provided with a two-way needle valve (7), and the side of the visible water washing tank (6) is connected to a gas-liquid separator (2). The outside of the visible water washing tank (6) is provided with a pretreatment cabinet (8). The side of the pretreatment cabinet (8) is connected to a pretreatment cabinet (19) through a steam inlet tank. The inside of the pretreatment cabinet (19) is provided with a desulfurization tank (15) and a silica gel tank (16). The side of the desulfurization tank (15) is provided with a linear filter (13). A bypass filter (20) is provided on the side of the filter (13). The side of the desulfurization tank (15) is connected to the gas-liquid separator (2) through the pressure reducing valve body (9). The side of the desulfurization tank (15) is connected to the safety discharge port and the instrument air port through the safety valve (10) and the air filter pressure reducing valve (11), respectively. The side of the gas-liquid separator (2) is connected to the membrane filter (22) through the adjustable flow meter (18). The side of the silica gel tank (16) is provided with a zero-point gas switching circuit (23).

2. The high-efficiency integrated preprocessing system according to claim 1, characterized in that: A T-type filter (4) and an electric heating pressure reducing valve (5) are provided between the visible water washing tank (6) and the gas-liquid separator (2).

3. The high-efficiency integrated preprocessing system according to claim 1, characterized in that: The bottom of the visible water washing tank (6) is connected to a washing water inlet via a two-way ball valve (1).

4. The high-efficiency integrated preprocessing system according to claim 1, characterized in that: The pretreatment cabinet (19) has a drain outlet connected to the inside of the cabinet via a gas-liquid separator (2) and an automatic drain tank (3).

5. The efficient integrated preprocessing system according to claim 1, characterized in that: The silicone container (16) is connected to a flow meter body (17) via a three-way ball valve (14).

6. The efficient integrated preprocessing system according to claim 1, characterized in that: The bypass filter (20) is provided with a vortex cooler (12) on its side.

7. The high-efficiency integrated preprocessing system according to claim 1, characterized in that: The desulfurization tank (15) is connected to a fast return port via a one-way valve (21).

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