A fuel gas switching device for a fuel-driven compressor

Abstract

The utility model provides a fuel gas switching device for a fuel-driven compressor, comprising: a first electric valve, a second electric valve, a third electric valve, a fourth electric valve, a fifth electric valve, a sixth electric valve, a valve, a first pipeline, a second pipeline, a third pipeline, a first filter, and a second filter, one end of the first pipeline is connected to one end of the second pipeline, and the other end of the first pipeline is connected to the other end of the second pipeline; the first electric valve, the first filter, and the fourth electric valve are all installed on the first pipeline; the third electric valve, the second filter, and the second electric valve are all installed on the second pipeline; one end of the third pipeline is connected to the first pipeline between the first electric valve and the first filter; the other end of the third pipeline is connected to the second pipeline between the third electric valve and the second filter, and the fifth electric valve and the sixth electric valve are both installed on the third pipeline; one end of the valve is connected to the other end of the first pipeline through the pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel-driven compressor units, in particular to a fuel gas switching device for a fuel-driven compressor. Background Art

[0002] Among the auxiliary systems of fuel-driven compressor units, the fuel gas system is one of the core auxiliary systems. Its main equipment consists of: fuel gas skid and fuel gas skid beside the engine. Its core function is to provide energy for the gas turbine. The main process flow is: the gas from the station filter outlet enters the fuel gas skid, is filtered, heated, and pressure-regulated, and then is transported to the fuel gas skid beside the engine for further pressure regulation, filtration, heating and dehydration treatment.

[0003] For a fuel-driven compressor unit in operation, when the fuel gas is interrupted, the unit will be shut down directly. There are two main reasons for the interruption of fuel gas: ① The filter in the operating path is clogged, resulting in insufficient gas flow or excessive impurities in the gas atmosphere, which affects the combustion of the gas turbine nozzle and causes a large temperature difference, resulting in the unit shutting down due to failure; ② The pressure fluctuation is too large, triggering the skid body cut-off protection, and the gas source is interrupted, resulting in the unit shutting down due to failure. Secondly, in order to prevent impurities in the natural gas from entering the gas turbine and clogging the fuel nozzle, the fuel gas skid filter has a higher precision. When the gas source is dirty, the filter will be more clogged due to long-term operation. In order to avoid insufficient gas flow and dirty gas atmosphere caused by dirty filters, the operating personnel are required to manually switch the main and standby paths and maintain the filter element. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a fuel gas switching device for a fuel-driven compressor in view of the deficiencies in the prior art.

[0005] The technical solution of the utility model to solve the above technical problems is as follows: a fuel gas switching device for a fuel-driven compressor, comprising: a first electric valve, a second electric valve, a third electric valve, a fourth electric valve, a fifth electric valve, a sixth electric valve, a valve, a first pipeline, a second pipeline, a third pipeline, a first filter, and a second filter, one end of the first pipeline is connected to one end of the second pipeline, and the other end of the first pipeline is connected to the other end of the second pipeline; the first electric valve, the first filter, and the fourth electric valve are all installed on the first pipeline; the third electric valve, the second filter, and the second electric valve are all installed on the second pipeline; one end of the third pipeline is connected to the first pipeline between the first electric valve and the first filter; the other end of the third pipeline is connected to the second pipeline between the third electric valve and the second filter, and the fifth electric valve and the sixth electric valve are both installed on the third pipeline; one end of the valve is connected to the other end of the first pipeline through a pipeline.

[0006] The beneficial effects of adopting the technical solution of the utility model are: creating conditions for one-button start of the fuel-driven compressor unit, and being able to safely and efficiently complete the main and standby line switching of the fuel gas skid. Improving the safety and stability of the operation of the fuel-driven compressor unit. The filter is set to remove solid and liquid impurities in the natural gas entering the gas turbine to ensure the purity of the natural gas. The sixth electric valve is used to adjust the valve opening in time according to the pressure changes on the pipeline when the process is switched or before the fuel gas is put into use, so as to quickly stabilize the pressure. The function of the fifth electric valve is to cut off the pipeline, and the valve is closed when the process switch is completed. Save the start-up preparation time and reduce the risk of human operation.

[0007] Furthermore, the bottom of the first filter is connected to a first electric valve sleeve type drain valve through a pipeline, the bottom of the second filter is connected to a second electric valve sleeve type drain valve through a pipeline, the first electric valve sleeve type drain valve and the second electric valve sleeve type drain valve are both connected to a drain manifold through a pipeline, and the drain manifold is provided with a safety shut-off valve and a pressure transmitter.

[0008] The beneficial effects of adopting the above further technical solution are: the setting of the sewage manifold can realize the automatic control of sewage discharge operation of the dirty filter, reduce the operation risk of personnel, and improve the safety and stability of the operation of the fuel-driven compressor unit. When the filter in the use path is blocked and the pressure difference of the filter is high, the set logic will automatically switch the main and standby paths. When the process switch runs normally, the blocked path of the filter will be automatically drained. The logic control automatically opens the first electric ball valve or the second electric ball valve, and automatically controls the opening of the first electric valve sleeve type sewage valve or the second electric valve sleeve type sewage valve through the pressure value feedback of the pressure transmitter to discharge sewage. The first electric valve sleeve type sewage valve and the second electric valve sleeve type sewage valve at the bottom of the filter automatically adjust the valve opening through the pressure value feedback of the pressure transmitter to realize automatic sewage discharge operation.

[0009] Furthermore, a first electric ball valve is installed on the pipeline between the first electric valve sleeve type drain valve and the first filter, a second electric ball valve is installed on the pipeline between the second electric valve sleeve type drain valve and the second filter, the drain manifold is connected to a drain tank, and the cut-off pressure of the safety cut-off valve is 1MPa.

[0010] The beneficial effect of adopting the above further technical solution is: when the filter in the used route is blocked and the filter pressure difference is high, the set logic will automatically switch the main and standby routes. When the process switch runs normally, the route where the filter is blocked will be automatically drained. The logic control automatically opens the first electric ball valve or the second electric ball valve, and the pressure value feedback of the pressure transmitter automatically controls the opening of the first electric valve sleeve drain valve or the second electric valve sleeve drain valve to drain the sewage. The safety shut-off valve is used to avoid the failure of the pressure regulation of the front-end drain valve, resulting in an increase in the pressure of the drain pipeline, and the natural gas entering the drain tank exceeds the use pressure of the drain tank, so the pressure limit value of the safety shut-off valve is 1MPa. The manual drain ball valve and manual valve sleeve drain valve are changed to electric, and a self-powered safety shut-off valve and a pressure transmitter are added to the drain manifold. When the drain manifold detects a pressure of 1.0MPa, the safety shut-off valve performs a cut-off protection function.

[0011] Furthermore, the first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the fifth electric valve, and the sixth electric valve are all connected to a host computer.

[0012] The beneficial effect of adopting the above further technical solution is: by optimizing the process flow, increasing the control logic, and realizing the functions of main and standby line switching of the fuel gas skid and automatic control of sewage discharge, the original device can realize automatic startup or remote automatic switching of the main and standby lines during operation, and at the same time meet the requirements of zero pressure fluctuation during the commissioning or switching process, automatically adjust the downstream pressure, and avoid false triggering of the skid overpressure protection function.

[0013] Further, the first electric valve is adjacent to one end of the first pipeline, the fourth electric valve is adjacent to the other end of the first pipeline, the third electric valve is adjacent to one end of the second pipeline, and the second electric valve is adjacent to the other end of the second pipeline.

[0014] The beneficial effect of adopting the above further technical solution is that it is easy to install the electric valve on the pipeline.

[0015] Furthermore, a first heater is provided on the first pipeline, and a second heater is provided on the second pipeline.

[0016] The beneficial effect of adopting the above further technical solution is that the heater is provided to heat the natural gas entering the gas turbine so that its temperature reaches the temperature required for combustion of the gas turbine.

[0017] Furthermore, a first safety cut-off valve is provided on the first pipeline, and a second safety cut-off valve is provided on the second pipeline.

[0018] The beneficial effect of adopting the above-mentioned further technical solution is: the safety cut-off valve is used to monitor the pipeline pressure. When the pipeline pressure at the rear end of the safety cut-off valve reaches the set pressure, the mechanical structure is automatically triggered to cut off, thereby protecting the equipment and pipeline from exceeding the operating pressure, and uploading the cut-off information to the host computer in the station control room.

[0019] Furthermore, a first self-operated pressure regulating valve and a second self-operated pressure regulating valve are provided on the first pipeline, and a third self-operated pressure regulating valve and a fourth self-operated pressure regulating valve are provided on the second pipeline.

[0020] The beneficial effect of adopting the above further technical solution is that the self-operated pressure regulating valve is used to automatically adjust during operation according to the manually set pressure parameter value to control the pressure after the pressure regulating valve.

[0021] Furthermore, the fifth electric valve is an electric ball valve, and the sixth electric valve is an electric pressure regulating valve.

[0022] The beneficial effect of adopting the above further technical solution is that the electric ball valve serves as a pipeline cutoff, and the valve is closed when the process switching is completed. The electric stop valve (electric pressure regulating valve) is used to adjust the valve opening in time according to the pressure change on the pipeline when the fuel gas is put into use before the process switching or starting, and can quickly stabilize the pressure.

[0023] Furthermore, the downstream pressure of the first pipeline and the second pipeline is 3.5 MPa.

[0024] The beneficial effect of adopting the above further technical solution is to improve the operating safety and stability of the fuel-driven compressor unit.

[0025] Advantages of additional aspects of the present invention will be partially given in the following description, and partially become apparent from the following description, or be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is one of the structural schematic diagrams of the fuel gas switching device for a fuel-driven compressor provided in an embodiment of the utility model.

[0027] Figure 2 This is the second structural schematic diagram of the fuel gas switching device for a fuel-driven compressor provided in an embodiment of the utility model.

[0028] Description of the accompanying drawings: 7301, first electric valve; 7402, second electric valve; 7401, third electric valve; 7302, fourth electric valve; 7320, fifth electric valve; 7420, sixth electric valve; 2804, valve; 73, first pipeline; 74, second pipeline; 75, third pipeline; 76, sewage manifold; FL301, first filter; FL401, second filter; EH703, first heater; EH704, second heater; SSV7309, first 1. Safety shut-off valve; SSV7409, 2. Safety shut-off valve; 7306, 3. Safety shut-off valve; PV7310, 1. Self-operated pressure regulating valve; PV7311, 2. Self-operated pressure regulating valve; PV7410, 3. Self-operated pressure regulating valve; PV7411, 4. Self-operated pressure regulating valve; 7305, 1. Electric valve sleeve type drain valve; 7405, 2. Electric valve sleeve type drain valve; 7304, 1. Electric ball valve; 7404, 2. Electric ball valve; 7306, safety shut-off valve; PT, pressure transmitter. DETAILED DESCRIPTION

[0029] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The embodiments given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0030] like Figure 1 and Figure 2 As shown, the embodiment of the utility model provides a fuel gas switching device for a fuel-driven compressor, including: a first electric valve 7301, a second electric valve 7402, a third electric valve 7401, a fourth electric valve 7302, a fifth electric valve 7320, a sixth electric valve 7420, a valve 2804, a first pipeline 73, a second pipeline 74, a third pipeline 75, a first filter FL301, and a second filter FL401, one end of the first pipeline 73 is connected to one end of the second pipeline 74, and the other end of the first pipeline 73 is connected to the other end of the second pipeline 74; the first electric valve 7301, the first filter FL301, the fourth electric valve 73 02 are all installed on the first pipeline 73; the third electric valve 7401, the second filter FL401, and the second electric valve 7402 are all installed on the second pipeline 74; one end of the third pipeline 75 is connected to the first pipeline 73 between the first electric valve 7301 and the first filter FL301; the other end of the third pipeline 75 is connected to the second pipeline 74 between the third electric valve 7401 and the second filter FL401, the fifth electric valve 7320 and the sixth electric valve 7420 are all installed on the third pipeline 75; one end of the valve 2804 is connected to the other end of the first pipeline 73 through a pipeline.

[0031] The beneficial effects of adopting the technical solution of the utility model are: creating conditions for one-button start of the fuel-driven compressor unit, and being able to safely and efficiently complete the main and standby line switching of the fuel gas skid. Improving the safety and stability of the operation of the fuel-driven compressor unit. The filter is set to remove solid and liquid impurities in the natural gas entering the gas turbine to ensure the purity of the natural gas. The sixth electric valve is used to adjust the valve opening in time according to the pressure changes on the pipeline when the process is switched or before the fuel gas is put into use, so as to quickly stabilize the pressure. The function of the fifth electric valve is to cut off the pipeline, and the valve is closed when the process switch is completed. Save the start-up preparation time and reduce the risk of human operation.

[0032] The fuel gas switching device for a fuel-driven compressor of the utility model embodiment optimizes the process flow, increases the control logic, realizes the functions of switching the main and standby routes of the fuel gas skid and automatically controlling sewage discharge, so that the original device can realize automatic commissioning at startup or remote automatic switching of the main and standby routes during operation, and at the same time, meet the requirements of zero pressure fluctuation during commissioning or switching, automatically adjust the downstream pressure, and avoid false triggering of the overpressure protection function of the skid; in terms of sewage discharge, remote pressure control automatic sewage discharge and overpressure automatic cut-off protection are realized.

[0033] Through this optimization, conditions are created for the one-button start-up of the fuel-driven compressor unit, and the fluctuation-free switching between the main and standby lines can be completed safely and efficiently. The dirty filter can be automatically controlled to discharge sewage, reducing the operating risks of personnel and improving the safety and stability of the fuel-driven compressor unit.

[0034] like Figure 1 and Figure 2 As shown, further, the bottom of the first filter FL301 is connected to the first electric valve sleeve type drain valve 7305 through a pipeline, the bottom of the second filter FL401 is connected to the second electric valve sleeve type drain valve 7405 through a pipeline, the first electric valve sleeve type drain valve 7305 and the second electric valve sleeve type drain valve 7405 are both connected to a drain manifold 76 through a pipeline, and the drain manifold 76 is provided with a safety shut-off valve 7306 and a pressure transmitter PT.

[0035] The beneficial effects of adopting the above further technical solution are: the setting of the sewage manifold can realize the automatic control of sewage discharge operation of the dirty filter, reduce the operation risk of personnel, and improve the safety and stability of the operation of the fuel-driven compressor unit. When the filter in the use path is blocked and the pressure difference of the filter is high, the set logic will automatically switch the main and standby paths. When the process switch runs normally, the blocked path of the filter will be automatically drained. The logic control automatically opens the first electric ball valve or the second electric ball valve, and automatically controls the opening of the first electric valve sleeve type sewage valve or the second electric valve sleeve type sewage valve through the pressure value feedback of the pressure transmitter to discharge sewage. The first electric valve sleeve type sewage valve and the second electric valve sleeve type sewage valve at the bottom of the filter automatically adjust the valve opening through the pressure value feedback of the pressure transmitter to realize automatic sewage discharge operation.

[0036] like Figure 1 and Figure 2 As shown, further, a first electric ball valve 7304 is installed on the pipeline between the first electric valve sleeve type drain valve 7305 and the first filter FL301, a second electric ball valve 7404 is installed on the pipeline between the second electric valve sleeve type drain valve 7405 and the second filter FL401, the drain manifold 76 is connected to a drain tank, and the cut-off pressure of the safety cut-off valve 7306 is 1 MPa.

[0037] The beneficial effect of adopting the above further technical solution is: when the filter in the used route is blocked and the filter pressure difference is high, the set logic will automatically switch the main and standby routes. When the process switch runs normally, the route where the filter is blocked will be automatically drained. The logic control automatically opens the first electric ball valve or the second electric ball valve, and the pressure value feedback of the pressure transmitter automatically controls the opening of the first electric valve sleeve drain valve or the second electric valve sleeve drain valve to drain the sewage. The safety shut-off valve is used to avoid the failure of the pressure regulation of the front-end drain valve, resulting in an increase in the pressure of the drain pipeline, and the natural gas entering the drain tank exceeds the use pressure of the drain tank, so the pressure limit value of the safety shut-off valve is 1MPa. The manual drain ball valve and manual valve sleeve drain valve are changed to electric, and a self-powered safety shut-off valve and a pressure transmitter are added to the drain manifold. When the drain manifold detects a pressure of 1.0MPa, the safety shut-off valve performs a cut-off protection function.

[0038] like Figure 1 and Figure 2 As shown, further, the first electric valve 7301, the second electric valve 7402, the third electric valve 7401, the fourth electric valve 7302, the fifth electric valve 7320, and the sixth electric valve 7420 are all connected to a host computer.

[0039] The beneficial effect of adopting the above further technical solution is: by optimizing the process flow, increasing the control logic, and realizing the functions of main and standby line switching of the fuel gas skid and automatic control of sewage discharge, the original device can realize automatic startup or remote automatic switching of the main and standby lines during operation, and at the same time meet the requirements of zero pressure fluctuation during the commissioning or switching process, automatically adjust the downstream pressure, and avoid false triggering of the skid overpressure protection function.

[0040] The first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the fifth electric valve and the sixth electric valve are all connected to a host computer via cables to achieve remote operation of the electric valves.

[0041] like Figure 1 and Figure 2 As shown, further, the first electric valve 7301 is adjacent to one end of the first pipeline 73, the fourth electric valve 7302 is adjacent to the other end of the first pipeline 73, the third electric valve 7401 is adjacent to one end of the second pipeline 74, and the second electric valve 7402 is adjacent to the other end of the second pipeline 74.

[0042] The beneficial effect of adopting the above further technical solution is that it is easy to install the electric valve on the pipeline.

[0043] like Figure 1 and Figure 2 As shown, further, a first heater EH703 is provided on the first pipeline 73 , and a second heater EH704 is provided on the second pipeline 74 .

[0044] The beneficial effect of adopting the above further technical solution is that the heater is provided to heat the natural gas entering the gas turbine so that its temperature reaches the temperature required for combustion of the gas turbine.

[0045] like Figure 1 and Figure 2 As shown, further, the first pipeline 73 is provided with a first safety shut-off valve SSV7309, and the second pipeline 74 is provided with a second safety shut-off valve SSV7409.

[0046] The beneficial effect of adopting the above-mentioned further technical solution is: the safety cut-off valve is used to monitor the pipeline pressure. When the pipeline pressure at the rear end of the safety cut-off valve reaches the set pressure, the mechanical structure is automatically triggered to cut off, thereby protecting the equipment and pipeline from exceeding the operating pressure, and uploading the cut-off information to the host computer in the station control room.

[0047] like Figure 1 and Figure 2As shown, further, the first pipeline 73 is provided with a first self-operated pressure regulating valve PV7310 and a second self-operated pressure regulating valve PV7311, and the second pipeline 74 is provided with a third self-operated pressure regulating valve PV7410 and a fourth self-operated pressure regulating valve PV7411.

[0048] The beneficial effect of adopting the above further technical solution is that the self-operated pressure regulating valve is used to automatically adjust during operation according to the manually set pressure parameter value to control the pressure after the pressure regulating valve.

[0049] like Figure 1 and Figure 2 As shown, further, the fifth electric valve 7320 is an electric ball valve, and the sixth electric valve 7420 is an electric pressure regulating valve.

[0050] The beneficial effect of adopting the above further technical solution is that the electric ball valve serves as a pipeline cutoff, and the valve is closed when the process switching is completed. The electric stop valve (electric pressure regulating valve) is used to adjust the valve opening in time according to the pressure change on the pipeline when the fuel gas is put into use before the process switching or starting, and can quickly stabilize the pressure.

[0051] like Figure 1 and Figure 2 As shown, further, the downstream pressure of the first pipeline 73 and the second pipeline 74 is 3.5 MPa.

[0052] The beneficial effect of adopting the above further technical solution is to improve the operating safety and stability of the fuel-driven compressor unit.

[0053] 1. FL301 and FL401 are filters, which are used to remove solid and liquid impurities in the natural gas entering the gas turbine to ensure the purity of the natural gas. EH703 and EH704 are electric heaters, which are used to heat the natural gas entering the gas turbine to reach the temperature required for gas turbine combustion.

[0054] 2. SSV7309, SSV7409, and 7306 are safety shut-off valves. By monitoring the pipeline pressure, when the pipeline pressure at the rear end of the safety shut-off valve reaches the set pressure, the mechanical structure is automatically triggered to cut off, protecting the equipment and pipeline from exceeding the operating pressure, and the cut-off information will be uploaded to the host computer in the station control room.

[0055] 3. PV7310, PV7311, PV7410, and PV7411 are all self-operated pressure regulating valves. They are automatically adjusted during operation according to the manually set pressure parameter values ​​to control the pressure behind the pressure regulating valve. The characteristic of the self-operated pressure regulating valve is that it cannot quickly regulate the sudden fluctuations in the pressure behind the valve. When the pipeline pressure suddenly changes drastically, the pressure behind the pressure regulating valve cannot be stabilized at the set pressure value. The situation where the pressure changes drastically usually occurs when the fuel gas is put into use before starting the machine, and when the process switches between the two routes. When the self-operated pressure regulating valve is already running stably, it will not react too slowly, resulting in excessive changes in pipeline pressure and causing the safety shut-off valve to shut off.

[0056] Therefore, the purpose of adding an electric stop valve (the sixth electric valve 7420) in the process after rectification is to adjust the valve opening in time according to the pressure changes in the pipeline when the process is switched or the fuel gas is put into use before starting the machine, so as to achieve rapid pressure stabilization.

[0057] 4.7320 is an electric ball valve, which is used to cut off the pipeline. The valve is closed when the process switch is completed.

[0058] 5. After the sewage discharge process is improved, there is a sewage discharge pipeline under FL301 and FL401, where the sewage discharge pipeline is connected to one end of the 7305 and 7405 electric valve sleeve sewage valves respectively, and the other end is connected to the sewage main pipe (sewage manifold), and the sewage main pipeline finally leads to the sewage tank.

[0059] 6. Valves 7304 and 7404 are the first electric ball valves for sewage discharge, and valves 7305 and 7405 are electric valve sleeve type sewage valves. These four valves are equipped with logic interlocks. When the filter in the active route is blocked and the pressure difference of the filter is high, the set logic will automatically switch the main and standby routes. When the process switch runs normally, the route where the filter is blocked will be automatically drained. The logic control automatically opens the first electric ball valve 7304 or the second electric ball valve 7404, and automatically controls the opening of the first electric valve sleeve type sewage valve 7305 or the second electric valve sleeve type sewage valve 7405 for sewage discharge through the pressure value feedback of the pressure transmitter PT.

[0060] 7.7306 is a safety shut-off valve, located at the rear end of the main sewage pipeline and at the front end of the sewage tank inlet. The safety shut-off valve prevents the failure of the pressure regulation of the front sewage valve, which leads to an increase in the pressure of the sewage pipeline and the natural gas entering the sewage tank exceeds the use pressure of the sewage tank. Therefore, the pressure limit of the safety shut-off valve is 1MPa.

[0061] 8. PT is a pressure transmitter, located at the rear end of the third safety shut-off valve 7306 and at the entrance of the sewage tank. The first electric valve sleeve sewage valve 7305 and the second electric valve sleeve sewage valve 7405 at the bottom of the filter automatically adjust the valve opening through the pressure value feedback of the pressure transmitter to realize automatic sewage discharge operation.

[0062] All valves in the startup process before the transformation were manual, and the process was as follows:

[0063] (001) Confirm that the route in use is the main route (the inlet valve is the first valve)

[0064] (002) Open the second valve and confirm that the valve (second valve) is fully open.

[0065] (003) Slowly open the third valve and observe the pressure reading on the pipeline gradually stabilizing, then turn the third valve to the fully open position and confirm.

[0066] (004) Slowly close the first valve and observe whether the pressure indication at the backup outlet gradually stabilizes. Fully close the first valve and confirm that it is fully closed.

[0067] (005) Close the second valve and confirm that the second valve is fully closed.

[0068] In the operation process, in order to stabilize the pressure in the pipeline, the ball valve opening needs to be controlled manually, and multiple people are needed on site to assist and cooperate. This not only wastes time and effort during the startup process and increases the risk of human error, but the ball valve is used for throttling control, which is not conducive to the healthy operation of the equipment, and thus leads to equipment damage and unit failure shutdown.

[0069] Modification content: Change the first valve, the third valve, the fourth valve, and the second valve to electric, and add a section of pipeline at the inlet valve (first valve) and add two new electric valves: a ball valve (fifth electric valve 7320) and a pressure regulating valve (sixth electric valve 7420). Among them, the sixth electric valve 7420 automatically adjusts the valve opening according to the downstream pipeline pressure. When the pipeline pressure is confirmed to be stable, the inlet ball valve (first electric valve 7301) / third electric valve 7401 full-open operation command is executed.

[0070] The startup process after the transformation (taking the first pipeline 73 as an example and the operating pressure of 3.5MPa):

[0071] (001) Check and confirm that the first electric valve 7301, the fourth electric valve 7302, the third electric valve 7401, the second electric valve 7402, the fifth electric valve 7320, and the sixth electric valve 7420 are all fully closed, and the valve 2804 is fully open.

[0072] (002) Execute the one-button start logic and set the downstream stable pressure to 3.5MPa.

[0073] (003) Remotely and automatically open the third electric valve 7401 to confirm that the third electric valve 7401 is fully opened.

[0074] (004) Remotely and automatically open the fifth electric valve 7320 to confirm that the fifth electric valve 7320 is fully opened.

[0075] (005) Remotely and automatically open the fourth electric valve 7302 to confirm that the fourth electric valve 7302 is fully opened.

[0076] (006) According to the set downstream pressure of 3.5 MPa, the electric pressure regulating valve (sixth electric valve 7420) automatically operates to confirm that the downstream pressure of the first pipeline 73 is stable at 3.5 MPa.

[0077] (007) After the unit is successfully started and ignited, the first electric valve 7301 is opened automatically and remotely to confirm that the first electric valve 7301 is fully opened.

[0078] (008) Remotely and automatically close the third electric valve 7401 to confirm that the third electric valve 7401 is fully closed.

[0079] (009) Remotely and automatically close the sixth electric valve 7420 to confirm that the sixth electric valve 7420 is fully closed.

[0080] (010) Remotely and automatically close the fifth electric valve 7320 to confirm that the fifth electric valve 7320 is fully closed.

[0081] The modified fuel gas skid can monitor pressure changes and automatically control valve opening and closing, saving start-up preparation time and reducing the risk of human operation.

[0082] The main and backup line switching process after transformation (taking the switching of the first pipeline 73 to the second pipeline 74 as an example):

[0083] (001) Confirm that the third electric valve 7401, the second electric valve 7402, the fifth electric valve 7320, and the sixth electric valve 7420 are in the fully closed position; the first electric valve 7301, the fourth electric valve 7302, and the valve 2804 are in the fully open position.

[0084] (002) The pressure difference of the first filter FL301 reaches 0.8MPa, and the automatic control system executes the main-standby switching process.

[0085] (003) Remotely and automatically open the second electric valve 7402 to confirm that the second electric valve 7402 is fully opened.

[0086] (004) Remotely and automatically open the fifth electric valve 7320 to confirm that the fifth electric valve 7320 is fully opened.

[0087] (005) According to the set downstream pressure of 3.5 MPa, the electric pressure regulating valve (the sixth electric valve 7420) is automatically operated to confirm that the downstream pressure of the second pipeline 74 is stable at 3.5 MPa.

[0088] (006) Remotely and automatically close the fourth electric valve 7302 to confirm that the fourth electric valve 7302 is fully closed.

[0089] (007) Remotely and automatically open the third electric valve 7401 to confirm that the third electric valve 7401 is fully opened.

[0090] (008) Remotely and automatically close the first electric valve 7301, the fifth electric valve 7320, and the sixth electric valve 7420 to confirm that the first electric valve 7301, the fifth electric valve 7320, and the sixth electric valve 7420 are fully closed.

[0091] The switching process after the transformation realizes full automation of logic control, and can automatically switch to the backup path according to the operation status of the filter on the active path. It eliminates the risk of accidental cut-off of the gas source caused by human operation and improves the safety and stability of the compressor unit operation.

[0092] Automatic sewage discharge process optimization: an electric ball valve (the first electric ball valve 7304 and the second electric ball valve 7404) and an electric valve sleeve sewage valve (the first electric valve sleeve sewage valve 7305 and the second electric valve sleeve sewage valve 7405) are installed at the bottom of the fuel gas skid filter (the first filter FL301 and the second filter FL401), with specifications of 2 inches and 600LB, and a self-operated safety shut-off valve (the third safety shut-off valve 7306) and a pressure transmitter PT are installed on the filter sewage manifold (sewage manifold 76), among which the electric ball valve and the electric valve sleeve sewage valve are normally closed, and the self-operated safety shut-off valve is normally open. Thus, remote automatic sewage discharge and overpressure automatic shut-off protection functions are realized.

[0093] Modification content: Change the manual sewage ball valve and manual valve sleeve sewage valve to electric ones, and add a self-operated safety shut-off valve and a pressure transmitter at the sewage manifold. When the sewage manifold detection pressure is 1.0MPa, the third safety shut-off valve 7306 performs the shut-off protection function.

[0094] (001) The pressure point of the safety shut-off valve is on the sewage manifold line, and the shut-off pressure of the shut-off valve main equipment is 1.0MPa.

[0095] (002) The safety shut-off valve (the third safety shut-off valve 7306) and the pressure transmitter are connected to the control logic together. When the pressure value detected by the pressure transmitter is 1.0MPa, the logic control protection shutdown is executed.

[0096] (003) The filter differential pressure transmitter and the electric ball valve are connected to the control logic together. When the differential pressure transmitter detects a pressure of ≤60KPa, the electric ball valve is automatically closed.

[0097] (004) The electric ball valve and the electric valve sleeve type drain valve are connected to the control logic together. After the electric ball valve is fully closed, the electric valve sleeve type drain valve is automatically closed.

[0098] (005) The electric sleeve drain valve and the pressure transmitter on the manifold are connected to the control logic together. The pressure transmitter detects the pressure value and uses feedback to adjust the valve opening of the electric sleeve drain valve. The drain pressure of the drain manifold should be controlled to be ≤0.95MPa.

[0099] (006) When the differential pressure transmitter detects a value ≥80KPa, the system will prioritize the main-backup line switching process.

[0100] (007) After confirming that the main and backup lines have been switched successfully, the sewage discharge control process is executed and the sewage discharge electric ball valve is automatically opened.

[0101] (008) According to the numerical feedback of the sewage manifold pressure transmitter, the opening position of the electric valve sleeve type sewage valve is automatically adjusted in real time.

[0102] (009) When the differential pressure transmitter detects a value of ≤60KPa, the system determines that the sewage discharge is completed, stops the sewage discharge process, and automatically closes the electric ball valve.

[0103] (010) Confirm that the electric ball valve is fully closed and the electric valve sleeve drain valve is automatically closed to complete the draining.

[0104] (011) When the pressure transmitter detects a value ≥ 0.95MPa, the safety shut-off valve will be automatically closed to stop the sewage discharge process.

[0105] Automatic switching process optimization: Change the fuel gas inlet and outlet ball valves from manual to electric control, and add a pipeline (third pipeline) between the inlet ball valve (first electric valve 7301) / third electric valve 7401 and the filter (first filter FL301 and second filter FL401), connect the main and backup lines (first pipeline and second pipeline), and set an electric ball valve (fifth electric valve) and an electric pressure regulating valve (sixth electric valve).

[0106] Automatic switching logic optimization: Add control logic to the newly added electric valves to realize remote operation or automatic control of the electric valves.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A fuel gas switching device for a fuel-driven compressor, characterized in that: include: A first electric valve, a second electric valve, a third electric valve, a fourth electric valve, a fifth electric valve, a sixth electric valve, a valve, a first pipeline, a second pipeline, a third pipeline, a first filter, a second filter, one end of the first pipeline is connected to one end of the second pipeline, and the other end of the first pipeline is connected to the other end of the second pipeline; the first electric valve, the first filter, and the fourth electric valve are all installed on the first pipeline; The third electric valve, the second filter, and the second electric valve are all installed on the second pipeline; one end of the third pipeline is connected to the first pipeline between the first electric valve and the first filter; the other end of the third pipeline is connected to the second pipeline between the third electric valve and the second filter, the fifth electric valve and the sixth electric valve are all installed on the third pipeline; one end of the valve is connected to the other end of the first pipeline through a pipeline.

2. A fuel gas switching device for a fuel-driven compressor according to claim 1, characterized in that: The bottom of the first filter is connected to a first electric valve sleeve type drain valve through a pipeline, and the bottom of the second filter is connected to a second electric valve sleeve type drain valve through a pipeline. The first electric valve sleeve type drain valve and the second electric valve sleeve type drain valve are both connected to a drain manifold through a pipeline, and the drain manifold is provided with a safety shut-off valve and a pressure transmitter.

3. A fuel gas switching device for a fuel-driven compressor according to claim 2, characterized in that: A first electric ball valve is installed on the pipeline between the first electric valve sleeve type drain valve and the first filter, a second electric ball valve is installed on the pipeline between the second electric valve sleeve type drain valve and the second filter, the drain manifold is connected to a drain tank, and the cut-off pressure of the safety cut-off valve is 1MPa.

4. The fuel gas switching device for a fuel-driven compressor according to claim 1, characterized in that: The first electric valve, the second electric valve, the third electric valve, the fourth electric valve, the fifth electric valve, and the sixth electric valve are all connected to a host computer.

5. The fuel gas switching device for a fuel-driven compressor according to claim 1, characterized in that: The first electric valve is adjacent to one end of the first pipeline, the fourth electric valve is adjacent to the other end of the first pipeline, the third electric valve is adjacent to one end of the second pipeline, and the second electric valve is adjacent to the other end of the second pipeline.

6. The fuel gas switching device for a fuel-driven compressor according to claim 1, characterized in that: The first pipeline is provided with a first heater, and the second pipeline is provided with a second heater.

7. The fuel gas switching device for a fuel-driven compressor according to claim 1, characterized in that: The first pipeline is provided with a first safety cut-off valve, and the second pipeline is provided with a second safety cut-off valve.

8. The fuel gas switching device for a fuel-driven compressor according to claim 1, characterized in that: The first pipeline is provided with a first self-operated pressure regulating valve and a second self-operated pressure regulating valve, and the second pipeline is provided with a third self-operated pressure regulating valve and a fourth self-operated pressure regulating valve.

9. The fuel gas switching device for a fuel-driven compressor according to claim 1, characterized in that: The fifth electric valve is an electric ball valve, and the sixth electric valve is an electric pressure regulating valve.

10. The fuel gas switching device for a fuel-driven compressor according to claim 1, characterized in that: The downstream pressure of the first pipeline and the second pipeline is 3.5 MPa.

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