Fta analyzer back pressure balancing system

Abstract

This utility model relates to the field of online analyzer technology and discloses a back pressure balancing system for an FTA analyzer, including an FTA analyzer, a back pressure balancing system, and a flare. The FTA analyzer is connected to the back pressure balancing system via an outlet pipe. One end of a return manifold is connected to the outlet pipe, and the other end is connected to the flare. A pneumatic pump is installed on the return manifold. A differential pressure flow meter is installed on the return manifold between the FTA analyzer and the pneumatic pump, with its other end connected to the return manifold between the FTA analyzer and the differential pressure flow meter, and the other end connected to the pneumatic pump. The control system is connected to the drive gas pipeline and the differential pressure flow meter. This utility model can reduce the pressure of the high-pressure gas discharged from the FTA analyzer, maintaining the discharged gas within a normal pressure range, enabling stable discharge of high-pressure gas. It solves the problem of high and fluctuating pipeline pressure preventing the discharge of exhaust gas after instrument analysis, improving system reliability and ensuring the long-term stability and maintainability of the system.

Description

Technical Field

[0001] This utility model relates to the field of safe emission technology for online analyzers, and specifically to a back pressure balancing system for an FTA analyzer. Background Technology

[0002] Online analyzer systems for safe emission control are widely used in production industries such as chemical, steel, cement, and power plants, as well as in environmental monitoring and safety monitoring. In these fields, online analyzer systems are used not only for detecting key substances in production processes, but also for monitoring safety-related substances and the emissions of environmental pollutants such as air and water pollutants.

[0003] When an FTA analyzer analyzes flammable gases, the analyzed gas cannot be directly discharged into the air. Instead, it is discharged into the original pipeline or flare. However, when analyzing high-pressure pipelines, the gas pressure entering the analyzer may be too high. When the high-pressure flammable gas is discharged into the high-pressure pipeline after analysis, back pressure may occur, which may damage the analyzer or cause flammable gas leakage. Utility Model Content

[0004] The technical problem this invention aims to solve is how to return the gas analyzed by the online analyzer to the original pipeline or flare under high pressure conditions in the sampling pipeline.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is to provide an FTA analyzer back pressure balancing system, including an FTA analyzer, a back pressure balancing system, and a flare. The FTA analyzer is connected to the back pressure balancing system through an outlet pipe. The back pressure balancing system includes a return main pipe, a pneumatic pump, a differential pressure flow meter, a dilution gas pipeline, a drive gas pipeline, and a control system. One end of the return main pipe is connected to the outlet pipe, and the other end is connected to the flare. The pneumatic pump is installed on the return main pipe. The differential pressure flow meter is installed on the return main pipe between the FTA analyzer and the pneumatic pump. One end of the dilution gas pipeline is connected to dilution gas, and the other end is connected to the return main pipe between the FTA analyzer and the differential pressure flow meter. One end of the drive gas pipeline is connected to drive gas, and the other end is connected to the pneumatic pump. The control system is connected to the drive gas pipeline and the differential pressure flow meter.

[0006] Optionally, a return manifold shut-off valve is provided on the return manifold between the FTA analyzer and the differential pressure flow meter.

[0007] Optionally, the dilution gas pipeline is provided with a dilution gas balloon valve, a dilution gas pressure reducing valve, and a dilution gas check valve in sequence from the dilution gas to the return main pipe.

[0008] Optionally, the drive air pipeline is provided with a drive air shut-off valve, a drive air check valve, and a drive air pneumatic valve in sequence between the drive air and the pneumatic pump.

[0009] Optionally, the control system includes a PLC control system and a pneumatic valve controller. The PLC control system is connected to the differential pressure flow meter, and the pneumatic valve controller is connected to the PLC control system and the driving pneumatic valve.

[0010] Optionally, a pneumatic valve control valve is provided between the pneumatic valve controller and the driving pneumatic valve. The pneumatic valve control valve is connected to valve air through a valve air pipeline, and a valve air shut-off valve is provided on the valve air pipeline.

[0011] Optionally, the differential pressure flow meter is provided with a flow-limiting orifice plate, which is located inside the return main pipe.

[0012] Optionally, a return main check valve is provided between the pneumatic pump and the flare.

[0013] Optionally, a discharge pressure transmitter is provided between the pneumatic valve and the return main check valve.

[0014] In summary, this invention, by incorporating a dilution gas and a pneumatic pump into the return main pipe, depressurizes the high-pressure gas discharged from the FTA analyzer, maintaining the discharged gas within the normal pressure range and ensuring the return main pipe remains at atmospheric pressure. This prevents backflow due to flare pressure, allowing for stable discharge of high-pressure gas. It solves the problem of fluctuating pipeline pressure preventing the discharge of exhaust gas after instrument analysis. Furthermore, it fully considers the use of ejectors as the sample introduction method in FTA instruments, improving system reliability, ensuring the safety of the instrument and personnel, and guaranteeing the long-term stability and maintainability of the system. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the back pressure balancing system of the FTA analyzer of this utility model;

[0016] In the diagram: 1. FTA analyzer; 2. Back pressure balancing system; 3. Return main shut-off valve; 4. Valve gas shut-off valve; 5. Differential pressure flow meter; 6. Flow limiting orifice plate; 7. Drive gas shut-off valve; 8. Drive gas pneumatic valve; 9. Pneumatic valve controller; 10. Pneumatic pump; 11. PLC control system; 12. Return main pipe; 13. Dilution balloon valve; 14. Dilution gas pressure reducing valve; 15. Dilution gas check valve; 16. Drive gas check valve; 17. Return main pipe check valve; 18. Discharge pressure transmitter. Detailed Implementation

[0017] The following combination Figure 1 The present invention will be described in further detail below.

[0018] This utility model discloses a back pressure balancing system for an FTA analyzer, referring to... Figure 1 The system includes an FTA analyzer 1, a back pressure balancing system 2, and a flare. The FTA analyzer 1 is connected to the back pressure balancing system 2 via an outlet pipe. The back pressure balancing system 2 includes a return main pipe 12, a pneumatic pump 10, a differential pressure flow meter 5, a dilution gas pipeline, a drive gas pipeline, and a control system. One end of the return main pipe 12 is connected to the outlet pipe, and the other end is connected to the flare. The pneumatic pump 10 is mounted on the return main pipe 12, and the differential pressure flow meter 5 is located between the FTA analyzer 1 and the pneumatic pump 10 on the return main pipe 12. 2. One end of the dilution gas pipeline is connected to dilution gas, and the other end is connected to the return main pipe 12 between the FTA analyzer 1 and the differential pressure flow meter 5. One end of the drive gas pipeline is connected to drive gas, and the other end is connected to the pneumatic pump 10. The control system is connected to the drive gas pipeline and the differential pressure flow meter 5. A return main pipe shut-off valve 3 is provided on the return main pipe 12 between the FTA analyzer 1 and the differential pressure flow meter 5. A flow limiting orifice plate 6 is provided on the differential pressure flow meter 5, and the flow limiting orifice plate 6 is located inside the return main pipe 12.

[0019] In a further embodiment, a dilution gas balloon valve 13, a dilution gas pressure reducing valve 14, and a dilution gas check valve 15 are sequentially provided on the dilution gas pipeline from the dilution gas to the return main pipe 12.

[0020] In a further embodiment, a drive air shut-off valve 7, a drive air check valve 16, and a drive air pneumatic valve 8 are sequentially provided on the drive air pipeline between the drive air and the pneumatic pump 10.

[0021] In a further embodiment, the control system includes a PLC control system 11 and a pneumatic valve controller 9. The PLC control system 11 is connected to the differential pressure flow meter 5, and the pneumatic valve controller 9 is connected to the PLC control system 11 and the driving pneumatic valve 8.

[0022] In a further embodiment, a pneumatic valve control valve is provided between the pneumatic valve controller 9 and the driving pneumatic valve 8. The pneumatic valve control valve is connected to valve air through a valve air pipeline. A valve air shut-off valve 4 is provided on the valve air pipeline. The valve air is used to drive the driving pneumatic valve 8.

[0023] In a further embodiment, a return main check valve 17 is provided between the pneumatic pump 10 and the flare; a discharge pressure transmitter 18 is provided between the pneumatic valve 10 and the return main check valve 17.

[0024] The discharge process of the FTA analyzer 1 in this utility model is as follows: After the FTA analyzer 1 has completed the analysis, the sample is discharged through the ejector inside the instrument and enters the return main pipe 12. After passing through the return main pipe shut-off valve 3, the dilution balloon valve 13 is opened. The dilution gas enters the return main pipe 12 through the dilution gas pressure reducing valve 14 and mixes with the sample gas. Then, it enters the pneumatic pump 10 through the differential pressure flow meter 5 with the flow limiting orifice plate 6 installed. The drive gas shut-off valve 7 is opened. The drive gas passes through the drive gas check valve 16 and the drive gas pneumatic valve 8 to drive the pneumatic pump 10, so that the sample in the pneumatic pump 10 is sucked in and discharged into the sample main pipe or the flare main pipe. The outlet pressure through the back pressure balance system can be viewed through the discharge pressure transmitter 18.

[0025] During this process, the pipeline connecting the exhaust gas from FTA analyzer 1 to the return main 12 needs to be a tube of at least 12mm. The return main 12 needs to be designed as a 1” PIPE pipe (a tube is used for nominal diameters below 15mm, and a PIPE pipe is used for nominal diameters above 15mm), meaning the diameter of the return main 12 is larger than the diameter of the exhaust pipe from FTA analyzer 1. The return main shut-off valve 3 is a 1” valve, and the exhaust gas entering the 1” PIPE pipe will have a buffering effect. In the return main 12, a slightly pressurized dilution gas is introduced from the dilution gas pressure reducing valve 14 and mixed with the instrument exhaust gas. This mixed gas is then controlled by a flow-limiting device. The differential pressure flow meter 5 of the orifice plate 6 can transmit the pipeline flow data to the PLC control system 11 in real time. The PLC control system 11 controls the pneumatic valve controller 9 based on the received flow, thereby controlling the suction force of the pneumatic pump 10 through the drive pneumatic valve 8. When the flow of the differential pressure flow meter 5 is fast, the suction force of the pneumatic pump 10 is increased to ensure that the return main pipe 12 is always under normal pressure. When the exhaust gas emission of the FTA analyzer 1 decreases, the dilution gas of the dilution gas pressure reducing valve 4 will increase the emission due to the suction force of the pneumatic pump 10, so that the pressure of the return pipe 12 can be maintained at normal pressure.

[0026] This invention features excellent system safety. One-way valves are added at the points where the driving gas, dilution gas, and sample tail gas come into contact as protective measures. For example, the dilution gas one-way valve 15 ensures that the tail gas of the FTA analyzer 1 will not contaminate the dilution gas. The driving gas one-way valve 16 and the return main one-way valve 17 protect this pressure stabilization system from backflow caused by the pressure at the return point, thereby protecting the safety of the instrument and the reliability of the system.

[0027] The FTA analyzer of this invention can improve the discharge pipeline conditions to 0.5 barg with a slight positive pressure, which can basically cover the pressure of the conventional exhaust gas recovery main pipe. It can be discharged into the original pipeline without the risk of backflow. When the exhaust gas main pipe pressure exceeds 0.5 barg, it is advisable to connect the sample exhaust gas discharge to the flare main pipe.

[0028] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A back pressure balancing system for an FTA analyzer, characterized in that, The system includes an FTA analyzer (1), a back pressure balancing system (2), and a flare. The FTA analyzer (1) is connected to the back pressure balancing system (2) via an outlet pipe. The back pressure balancing system (2) includes a return main pipe (12), a pneumatic pump (10), a differential pressure flow meter (5), a dilution gas pipeline, a drive gas pipeline, and a control system. One end of the return main pipe (12) is connected to the outlet pipe, and the other end is connected to the flare. The pneumatic pump (10) is located on the return main pipe (12). The differential pressure flow meter (5) is located on the return main pipe (12) between the FTA analyzer (1) and the pneumatic pump (10). One end of the dilution gas pipeline is connected to dilution gas, and the other end is connected to the return main pipe (12) between the FTA analyzer (1) and the differential pressure flow meter (5). One end of the drive gas pipeline is connected to drive gas, and the other end is connected to the pneumatic pump (10). The control system is connected to the drive gas pipeline and the differential pressure flow meter (5).

2. The back pressure balancing system for the FTA analyzer according to claim 1, characterized in that, A return main shut-off valve (3) is provided on the return main (12) between the FTA analyzer (1) and the differential pressure flow meter (5).

3. The back pressure balancing system for the FTA analyzer according to claim 1, characterized in that, The dilution gas pipeline is provided with a dilution gas balloon valve (13), a dilution gas pressure reducing valve (14), and a dilution gas check valve (15) in sequence from the dilution gas to the return main pipe (12).

4. The back pressure balancing system of the FTA analyzer according to claim 1, characterized in that, The drive air pipeline is provided with a drive air shut-off valve (7), a drive air check valve (16) and a drive air pneumatic valve (8) in sequence between the drive air and the pneumatic pump (10).

5. The back pressure balancing system of the FTA analyzer according to claim 4, characterized in that, The control system includes a PLC control system (11) and a pneumatic valve controller (9). The PLC control system (11) is connected to the differential pressure flow meter (5), and the pneumatic valve controller (9) is connected to the PLC control system (11) and the driving pneumatic valve (8).

6. The back pressure balancing system for the FTA analyzer according to claim 5, characterized in that, A pneumatic valve control valve is provided between the pneumatic valve controller (9) and the driving pneumatic valve (8). The pneumatic valve control valve is connected to a valve gas through a valve gas pipeline. A valve gas shut-off valve (4) is provided on the valve gas pipeline.

7. The back pressure balancing system for the FTA analyzer according to claim 1, characterized in that, The differential pressure flow meter (5) is provided with a flow limiting orifice plate (6), which is located inside the return main pipe (12).

8. The back pressure balancing system of the FTA analyzer according to claim 1, characterized in that, A return main check valve (17) is provided between the pneumatic pump (10) and the torch.

9. The back pressure balancing system of the FTA analyzer according to claim 8, characterized in that, A discharge pressure transmitter (18) is provided between the pneumatic pump (10) and the return main check valve (17).

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