Methanol host test ventilation system

Abstract

The invention provides a methanol host test ventilation system, which is used for performing a ventilation test on a methanol host to be tested, and comprises a first purging liquid return pipe, a second purging liquid return pipe, a methanol liquid inlet pipe, an airtight test pipeline, a first bench test pipeline, a second bench test pipeline and an exhaust fan, the first end of the airtight test pipeline is communicated with a compressed air source, and the second end of the airtight test pipeline is communicated with the outer pipe of the methanol liquid inlet pipe. And two ends of the first bench test pipeline are respectively communicated with a compressed air source and an exhaust fan through an outer pipe of the methanol liquid inlet pipe, a ventilation outer pipe of the first methanol host and an outer pipe of the first purging liquid return pipe. And two ends of the second bench test pipeline are respectively communicated with a compressed air source and an exhaust fan through an outer pipe of the methanol liquid inlet pipe, a ventilation outer pipe of the second methanol host and an outer pipe of the second purging liquid return pipe. The problems that in the prior art, a system is complex in structure and poor in adaptability, and tests of various models are difficult to achieve are solved.

Description

Technical Field

[0001] The invention relates to the field of methanol diesel engines, in particular to a methanol main engine test ventilation system. Background Art

[0002] With the International Maritime Organization (IMO) proposing the goal of achieving net zero emissions around 2050 and setting two key milestones in 2030 and 2040, low-carbon methanol dual-fuel diesel engines have become widely used. This has also introduced new risks to the bench testing of low-carbon methanol dual-fuel diesel engines during production at main engine plants. To ensure that the final assembly test workshop is an intrinsically safe main engine facility, a double-walled pipe mechanical ventilation system is required to protect the methanol supply system and reduce the risk of fire in the event of a methanol leak. The double-walled pipe ventilation system is the most important protective measure for the methanol supply system, reducing the risks associated with methanol leaks. In the event of a methanol leak, the leak can be quickly detected, the methanol supply system shut down, the main engine switched to fuel mode, and the leaked methanol is ventilated, diluted, and discharged.

[0003] However, the flammable nature of methanol fuel has brought new safety challenges to the production bench test of the main engine factory. The traditional single-unit ventilation system has the following problems:

[0004] 1. Each model requires a separate ventilation system, resulting in large repeated investments in equipment;

[0005] 2. The test bench space utilization rate is low, which is not conducive to parallel testing of multiple models;

[0006] 3. System switching is complex, affecting test efficiency;

[0007] It can be seen that the existing technology has problems such as complex ventilation system structure, poor adaptability, and difficulty in implementing tests on multiple models. Summary of the Invention

[0008] The present invention provides a methanol main engine test ventilation system, which solves the problems in the prior art of complex system structure, poor adaptability and difficulty in implementing tests on multiple models.

[0009] The present invention provides a methanol main engine test ventilation system for performing a ventilation test on a methanol main engine to be tested, wherein the methanol main engine to be tested is located in a test workshop, and the fuel pipe of the methanol main engine to be tested includes a fuel inner pipe and a ventilation outer pipe which are sleeved together; the system includes a first purge return pipe, a second purge return pipe, a methanol liquid inlet pipe, an airtight test pipeline, a first test bench pipeline, a second test bench pipeline, and an exhaust fan;

[0010] The first purge return pipe, the second purge return pipe, and the methanol inlet pipe are all double-walled pipes, comprising an inner pipe and an outer pipe. The inner pipe is connected to the fuel inner pipe of the methanol host to be tested, and the outer pipe is sleeved outside the inner pipe to accommodate and circulate compressed air. The pipe wall of the first end of the outer pipe has a plurality of connecting holes for connecting to the ventilation outer pipe of the methanol host to be tested.

[0011] The methanol host to be tested includes a first methanol host and a second methanol host;

[0012] The first end of the airtight test pipeline is connected to the compressed air source, and the second end of the airtight test pipeline is connected to the outer pipe of the methanol inlet pipe;

[0013] The two ends of the first test bench pipeline are connected to the compressed air source and the exhaust fan respectively through the outer pipe of the methanol inlet pipe, the ventilation outer pipe of the first methanol main unit and the outer pipe of the first purge return pipe;

[0014] The two ends of the second bench test pipeline are connected to the compressed air source and the exhaust fan respectively through the outer pipe of the methanol inlet pipe, the ventilation outer pipe of the second methanol main unit and the outer pipe of the second purge return pipe;

[0015] Among them, the airtight test pipeline, the first test pipeline, the second test pipeline, and the exhaust fan are all located outside the test workshop.

[0016] The present invention can meet the different working conditions of bench tests of different methanol main engine models (such as marine dual-fuel methanol main engines) through the mutual connection and coordination of the airtight test pipeline, the first bench test pipeline, the second bench test pipeline, the first purge return pipe, the second purge return pipe and the methanol inlet pipe, greatly improving the utilization efficiency of the test bench and the test efficiency of the methanol main engine. In addition, the system does not need to be separately configured with a ventilation system for each methanol model, which greatly reduces the test cost. Furthermore, the system has a simple pipeline structure, which is conducive to the switching of different methanol main engines under different test conditions, simple operation and high test efficiency.

[0017] Optionally, a liquid supply tank and a liquid return tank are provided outside the test workshop, a first end of an inner tube in the methanol liquid inlet pipe is connected to the liquid supply tank, and a second end of the inner tube in the methanol liquid inlet pipe is connected to the fuel inlet of the first methanol main engine or the fuel inlet of the second methanol main engine;

[0018] The first end of the inner tube of the first purge liquid return pipe is connected to the liquid return tank, and the second end of the inner tube of the first purge liquid return pipe is connected to the fuel outlet of the first methanol main engine;

[0019] The first end of the inner tube of the second purge liquid return pipe is connected to the liquid return tank, and the second end of the inner tube of the second purge liquid return pipe is connected to the fuel outlet of the second methanol main engine.

[0020] Optionally, a first shut-off valve is provided on the airtight test pipeline, and along the flow direction of the compressed air in the pipeline, the first shut-off valve is located between the compressed air source and the outer tube of the methanol inlet pipe.

[0021] Optionally, the first test bench pipeline is provided with a second shut-off valve, a third shut-off valve, a fourth shut-off valve, a fifth shut-off valve, a flow control valve, a pressure sensor and a hydrocarbon sensor;

[0022] Wherein, along the flow direction of compressed air in the pipeline, the second shut-off valve is located upstream of the third shut-off valve, the flow control valve is located between the second shut-off valve and the third shut-off valve, and the second shut-off valve, the third shut-off valve and the flow control valve are all located upstream of the first purge return pipe;

[0023] The fourth shut-off valve is located upstream of the fifth shut-off valve, the pressure sensor is located upstream of the fourth shut-off valve, and the fourth shut-off valve, the fifth shut-off valve and the pressure sensor are all located downstream of the first purge liquid return pipe;

[0024] The hydrocarbon sensor is located between the fifth shut-off valve and the exhaust fan.

[0025] Optionally, a sixth shut-off valve and a seventh shut-off valve are provided on the second test bench pipeline;

[0026] The inlet of the sixth shut-off valve is connected to the compressed air source, the outlet of the sixth shut-off valve is connected to the inlet of the third shut-off valve, the inlet of the seventh shut-off valve is connected to the outer pipe of the second purge return pipe, and the outlet of the seventh shut-off valve is connected to the exhaust fan through the hydrocarbon sensor.

[0027] Optionally, the methanol host test ventilation system further includes a main pipeline, the inlet of the main pipeline is connected to the compressed air source, and the outlet of the main pipeline is connected to the first shut-off valve, the second shut-off valve and the sixth shut-off valve respectively;

[0028] A throttle valve is provided on the main pipeline.

[0029] The embodiment of the present invention can flexibly control the on-off of each pipeline to match different test conditions of different models by arranging the above-mentioned control valves (such as the first shut-off valve to the seventh shut-off valve, the flow control valve, the throttle valve, etc.) on each pipeline. At the same time, through the setting of the above-mentioned control valves, the embodiment of the present invention can improve the utilization rate of the pipeline, realize multiple test functions without adding pipelines, simplify the system structure, and improve the test efficiency.

[0030] Optionally, a bypass control valve is also provided on the first test bench pipeline;

[0031] The inlet and outlet of the bypass control valve are respectively connected to the inlet and outlet of the exhaust fan.

[0032] The embodiment of the present invention provides a bypass control valve between the inlet and outlet of the exhaust fan, so that the air flow and pressure in the pipeline can be adjusted through the bypass control valve, thereby enriching the possibility of operating parameters and improving the reliability and safety of system testing.

[0033] Optionally, the methanol host test ventilation system further includes a first valve group control unit;

[0034] The first valve group control unit is electrically connected to the first shut-off valve, the third shut-off valve, and the fourth shut-off valve to control the opening and closing of each shut-off valve.

[0035] Optionally, the methanol host test ventilation system also includes a second valve group control unit, which is electrically connected to the fifth shut-off valve, the sixth shut-off valve and the seventh shut-off valve to control the opening and closing of each shut-off valve.

[0036] Optionally, the methanol liquid supply system control unit of the methanol host to be tested is reused as the second valve group control unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic structural diagram of a methanol host test ventilation system according to an embodiment of the present invention;

[0038] Figure 2 This is a structural diagram of the ventilation system for the methanol host test in working condition 1 according to an embodiment of the present invention;

[0039] Figure 3 This is a structural diagram of the ventilation system for the methanol host test according to an embodiment of the present invention in working condition 2;

[0040] Figure 4 This is a structural diagram of the methanol host test ventilation system in working condition three according to an embodiment of the present invention.

[0041] Description of reference numerals:

[0042] 1: Methanol host test ventilation system;

[0043] 101: First purge return pipe; 102: Second purge return pipe; 103: Methanol inlet pipe; 104: Main pipeline;

[0044] 11: First test bench pipeline; 12: Second test bench pipeline; 13: Airtightness test pipeline; 14: Exhaust fan; 151: First shut-off valve; 152: Second shut-off valve; 153: Third shut-off valve; 154: Fourth shut-off valve; 155: Fifth shut-off valve; 156: Sixth shut-off valve; 157: Seventh shut-off valve; 158: Throttle valve; 159: Bypass control valve;

[0045] 161: flow control valve; 162: pressure sensor; 163: hydrocarbon sensor;

[0046] 171: first check valve; 172: second check valve; 173: third check valve;

[0047] 181: first valve group control unit;

[0048] 2: Methanol host to be tested; 21: First methanol host; 22: Second methanol host. DETAILED DESCRIPTION

[0049] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0050] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0051] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0052] The terms “first”, “second”, etc. are only used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0053] In the description of this embodiment, it should be noted that, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this embodiment based on specific circumstances.

[0054] To make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0055] The present invention provides a methanol host test ventilation system 1, see Figure 1, used to conduct ventilation tests on the methanol main engine under test. The fuel pipe of the methanol main engine under test includes an inner fuel pipe and an outer ventilation pipe that are nested together. The methanol main engine under test 2 is located in the test workshop and includes a first purge return pipe 101, a second purge return pipe 102, a methanol inlet pipe 103, an airtightness test pipeline 13, a first test bench pipeline 11, a second test bench pipeline 12, and an exhaust fan 14.

[0056] The first purge return liquid pipe 101, the second purge return liquid pipe 102 and the methanol inlet pipe 103 are all double-walled pipes, which include an inner pipe and an outer pipe. The inner pipe is used to accommodate and circulate methanol, and the inner pipe is connected to the fuel inner pipe of the methanol host to be tested. The outer pipe is sleeved outside the inner pipe and is used to accommodate and circulate compressed air. The first end of the outer pipe has a plurality of connecting holes in the pipe wall, which are used to connect to the ventilation outer pipe of the methanol host to be tested.

[0057] Specifically, one end of the double-walled outer tube connects to the methanol main unit's ventilation outer tube via sixteen circumferentially distributed holes with a diameter of 5 mm. The other end is connected to an exhaust fan. The inner tube serves as the methanol supply line, while the outer tube acts as a protective tube. The space between the inner and outer tubes is continuously drawn by an exhaust fan, configured as a negative-pressure mechanical ventilation system with a ventilation capacity of at least 30 times per hour. Leaks in the inner tube or low airflow in the double-walled tube interlayer are detected by a flow switch and hydrocarbon sensor, which transmit an alarm signal to the main unit's security system. The exhaust fan also meets the explosion-proof safety requirements of the area and is located in a safe location.

[0058] The methanol main engine to be tested includes a first methanol main engine and a second methanol main engine. It will be understood by those skilled in the art that the first methanol main engine and the second methanol main engine can be of the same type or different types. For example, both can be marine dual-fuel methanol main engines. More specifically, for example, the first methanol main engine is a MAN series methanol main engine provided by German engine manufacturer MAN Energy Solutions, and the second methanol main engine is a WinGD series methanol main engine developed by CSIC Winterthur Engine Co., Ltd.

[0059] Specifically, such as Figure 2 As shown, the first end of the airtight test pipeline 13 is connected to the compressed air source, and the second end of the airtight test pipeline 13 is connected to the outer tube of the methanol inlet pipe 103.

[0060] like Figure 3 As shown, both ends of the first test bench pipeline 11 are connected to the compressed air source and the exhaust fan 14 respectively through the outer pipe of the methanol inlet pipe 103, the ventilation outer pipe of the first methanol main unit 21 and the outer pipe of the first purge return pipe 101.

[0061] like Figure 4As shown, both ends of the second bench test pipeline 12 are connected to the compressed air source and the exhaust fan 14 respectively through the outer pipe of the methanol inlet pipe 103, the ventilation outer pipe of the second methanol main unit 22 and the outer pipe of the second purge return pipe 102.

[0062] Among them, the airtight test pipeline 13, the first test bench pipeline 11, the second test bench pipeline 12, and the exhaust fan 14 are all located outside the test workshop.

[0063] The specifications of the compressed air source can be selected according to the actual test conditions. In an example embodiment, Figure 1 As shown, the parameters of the compressed air are 7-9 bar. Any device that can output compressed air meeting this parameter does not depart from the scope of the embodiments of the present invention.

[0064] The present invention can meet the different working condition tests of different methanol host models through the mutual connection and coordination of the airtight test pipeline 13, the first test bench pipeline 11, the second test bench pipeline 12, the first purge return pipe 101, the second purge return pipe 102 and the methanol inlet pipe 103, thereby greatly improving the utilization efficiency of the test bench and the test efficiency of the methanol host. In addition, the system does not need to be separately configured with a ventilation system for each methanol model, which greatly reduces the test cost. Furthermore, the system has a simple pipeline structure, which is conducive to the switching of different methanol hosts under different test conditions, simple operation and high test efficiency.

[0065] In one embodiment, a liquid supply tank (not shown in the figure) and a liquid return tank (not shown in the figure) are provided outside the test workshop, the first end of the inner tube in the methanol liquid inlet pipe 103 is connected to the liquid supply tank, and the second end of the inner tube in the methanol liquid inlet pipe 103 is connected to the first methanol main unit 21 (such as Figure 2 as shown) or the fuel inlet of the second methanol host 22 (as shown) Figure 4 In a further embodiment, the outlet of the liquid supply tank is provided with a liquid supply skid (or can be understood as a liquid supply valve group), and the methanol liquid inlet pipe 103 can be connected to the liquid supply tank through the liquid supply skid.

[0066] The first end of the inner tube of the first purge liquid return pipe 101 is connected to the liquid return tank (not shown in the figure), and the second end of the inner tube of the first purge liquid return pipe 101 is connected to the first methanol main unit 21 (as shown in the figure). Figure 2 fuel outlet as shown).

[0067] The first end of the inner tube of the second purge return pipe 102 is connected to the return liquid tank (not shown in the figure), and the second end of the inner tube of the second purge return pipe 102 is connected to the second methanol main unit 22 (as shown in the figure). Figure 4 fuel outlet as shown).

[0068] Specifically, the above-mentioned fuel inlet can be understood as the inlet of the fuel inner tube of the methanol host to be tested (such as the first methanol host 21 or the second methanol host 22), and the above-mentioned fuel outlet can be understood as the outlet of the fuel inner tube of the methanol host to be tested.

[0069] To reduce costs, in one embodiment, the inner tube of the first purge liquid return pipe 101 is connected to the liquid return tank via a single-walled pipe. The first purge liquid return pipe 101 is located entirely within the workshop, while the single-walled pipe is located outside the workshop. The inner tube of the second purge liquid return pipe 102 is connected to the liquid return tank via a single-walled pipe. The second purge liquid return pipe 102 is located entirely within the workshop, while the single-walled pipe is located outside the workshop.

[0070] For further implementation, see Figure 1 , and combined with Figure 2 and Figure 3 It is understood that the airtight test pipeline 13 is provided with a first shut-off valve 151, which is provided along the flow direction of the compressed air in the pipeline (such as Figure 2 The first shut-off valve 151 is located between the compressed air source and the outer tube of the methanol inlet pipe 103.

[0071] Further, such as Figure 3 As shown, the first test bench pipeline 11 is provided with a second shut-off valve 152 , a third shut-off valve 153 , a fourth shut-off valve 154 , a fifth shut-off valve 155 , a flow control valve 161 , a pressure sensor 162 and a hydrocarbon sensor 163 .

[0072] Among them, along the flow direction of compressed air in the pipeline (such as Figure 3 The second shut-off valve 152 is located upstream of the third shut-off valve 153, the flow control valve 161 is located between the second shut-off valve 152 and the third shut-off valve 153, and the second shut-off valve 152, the third shut-off valve 153 and the flow control valve 161 are all located upstream of the first purge liquid return pipe 101.

[0073] Fourth shutoff valve 154 is located upstream of fifth shutoff valve 155. Pressure sensor 162 is also located upstream of fourth shutoff valve 154. Fourth shutoff valve 154, fifth shutoff valve 155, and pressure sensor 162 are all located downstream of first purge return pipe 101. Hydrocarbon sensor 163 is located between fifth shutoff valve 155 and exhaust fan 14.

[0074] Those skilled in the art will appreciate that the flow control valve 161 can also be understood as a flow switch, used to monitor the normal flow of compressed air and send an alarm signal when the flow rate is abnormal. The hydrocarbon sensor is used to monitor hazardous gases and send an alarm signal when the concentration exceeds the standard. The number of valves can be set as needed. In an exemplary embodiment, the number of flow control valves 161 is three. In one embodiment, two flow control valves 161 are installed on the common pipeline of the first test bench pipeline 11 and the second test bench pipeline 12, and the other is installed on the first test bench pipeline 11. The number of hydrocarbon sensors 163 is two. Multiple valves can improve the reliability and safety of the system.

[0075] In one embodiment, a bypass control valve 159 is further provided on the first test bench pipeline 11 , and the inlet and outlet of the bypass control valve 159 are respectively connected to the inlet and outlet of the exhaust fan 14 .

[0076] The embodiment of the present invention sets a bypass control valve 159 between the inlet and outlet of the exhaust fan 14, so that the air flow and pressure in the pipeline can be adjusted through the bypass control valve 159, thereby enriching the possibility of operating parameters and improving the reliability and safety of the system test.

[0077] In a further embodiment, Figure 4 As shown, a sixth shut-off valve 156 and a seventh shut-off valve 157 are provided on the second bench test pipeline 12 .

[0078] The inlet of the sixth shut-off valve 156 is connected to the compressed air source, the outlet of the sixth shut-off valve 156 is connected to the inlet of the third shut-off valve 153, the inlet of the seventh shut-off valve 157 is connected to the outer tube of the second purge return pipe 102, and the outlet of the seventh shut-off valve 157 is connected to the exhaust fan 14 through the hydrocarbon sensor 163.

[0079] In one embodiment, Figures 1 to 4 As shown, the methanol main engine test ventilation system 1 also includes a main pipeline 104. The inlet of the main pipeline 104 is connected to the compressed air source, and the outlet of the main pipeline 104 is respectively connected to the first shut-off valve 151, the second shut-off valve 152, and the sixth shut-off valve 156. A throttle valve 158 is provided on the main pipeline 104. In one embodiment, the main pipeline 104 can be a compressed air supply pipeline. In other embodiments, the main pipeline 104 is a main control pipeline connected to the compressed air supply pipeline.

[0080] In one embodiment, along the flow direction of the medium in the pipeline, a first check valve 171 is provided in front of the first shut-off valve 151, a second check valve 172 is provided behind the second shut-off valve 152, and a third check valve 173 is provided behind the sixth shut-off valve 156 to prevent the backflow of compressed air.

[0081] The embodiment of the present invention can flexibly control the on-off of each pipeline to match different test conditions of different models by arranging the above-mentioned control valves (such as the first shut-off valve 151 to the seventh shut-off valve 157, the flow control valve 161, the throttle valve 158, etc.) on each pipeline. At the same time, through the setting of the above-mentioned control valves, the embodiment of the present invention can improve the utilization rate of the pipeline, realize multiple test functions without adding pipelines, simplify the system structure, and improve the test efficiency.

[0082] The present invention does not limit the valve group opening and closing control system. For example, it can be manually controlled or electrically controlled. The types of valves are not limited as long as they can play the corresponding shutoff, throttling, and flow regulation functions. In an exemplary embodiment, the first shut-off valve 151 and the third shut-off valve 153 to the seventh shut-off valve 157 are all pneumatic shut-off valves, and the second shut-off valve 152 is a solenoid valve.

[0083] In a further embodiment, Figures 1 to 4 As shown, the methanol engine test ventilation system 1 also includes a first valve group control unit 181. The first valve group control unit 181 is electrically connected to the first shut-off valve 151, the third shut-off valve 153, and the fourth shut-off valve 154 to control the opening and closing of each shut-off valve. In one example, the first shut-off valve 151, the third shut-off valve 153, and the fourth shut-off valve 154 are pneumatically controlled valves, and the first valve group control unit 181 controls the opening and closing of each valve by controlling the air. In other alternative embodiments, the valves may be of other types, such as electric valves, solenoid valves, etc. In one example embodiment, the first shut-off valve 151 is normally closed in the event of a failure, and the third shut-off valve 153 and the fourth shut-off valve 154 are normally open in the event of a failure. The methanol engine test ventilation system 1 also includes a second valve group control unit (not shown in the figure), which is electrically connected to the sixth shut-off valve 156 and the seventh shut-off valve 157 to control the opening and closing of the sixth shut-off valve 156 and the seventh shut-off valve 157. In one embodiment, the methanol liquid supply system control unit of the methanol host 2 to be tested (eg, the first methanol host 21 or the second methanol host 22 ) is reused as the second valve group control unit.

[0084] The following describes the various test processes of the methanol host test ventilation system 1 according to an embodiment of the present invention:

[0085] When conducting air tightness tests on double wall pipe systems, see Figure 2 , compressed air flows as follows Figure 2As shown by the middle arrow, the third shut-off valve 153 and the fourth shut-off valve 154 are first controlled to be closed by the first valve group control unit 181, and the first shut-off valve 151 is controlled to be opened. The 7-bar compressed air after throttling and reducing pressure is passed through the first shut-off valve 151 through the air-tightness test pipeline 13, the methanol inlet pipe 103, the methanol main unit 2 to be tested and the first purge return liquid pipeline 101 to maintain the pressure between the third shut-off valve 153 and the fourth shut-off valve 154, and the compressed air is kept in the pipeline for 15 minutes. If the pressure of the pressure sensor 162 does not drop, it indicates that the system air tightness is qualified.

[0086] Before the bench test of the first methanol host 21, please refer to Figure 3 , compressed air flows as follows Figure 3 As indicated by the middle arrow, the second valve assembly control unit (e.g., the methanol liquid supply system control unit or the main unit double-walled pipe ventilation control system) opens the second shutoff valve 152, starting the exhaust fan 14. The first valve assembly control unit 181 controls the third and fourth shutoff valves 153 and 154 to open, while the first shutoff valve 151 is closed. In the event of a failure, the third and fourth shutoff valves 153 and 154 become normally open, while the first shutoff valve 151 becomes normally closed. The second valve assembly control unit (e.g., the methanol liquid supply system control unit or the main unit double-walled pipe ventilation control system) controls the fifth shutoff valve 155 to open, while the remaining valves remain closed. This allows the throttled and decompressed 7 bar compressed air to flow through the first bench test pipeline 11, the methanol inlet pipe 103, the first purge return pipe 101, the first methanol main unit 21, and the exhaust fan 14. The flow control valve 161 and the hydrocarbon sensor 163 are opened. If the flow rate and hydrocarbon data are normal, the bench test of the first methanol main unit 21 can proceed. When the compressed air flow and pressure in the system are too large, they can be adjusted through the bypass control valve 159 (such as a manual ball valve).

[0087] Before the bench test of the second methanol host 22 is carried out, Figure 4As shown, the second valve group control unit (e.g., the methanol liquid supply system control unit or the main unit double-walled pipe ventilation control system) opens the sixth and seventh shut-off valves 156 and 157, starts the exhaust fan 14, and opens the third and fourth shut-off valves 153 and 154 (the third and fourth shut-off valves 153 and 154 are normally open in the event of a failure). The remaining valves remain closed, allowing the 7-bar compressed air, which has undergone throttling and reduced pressure, to flow through the second bench test pipeline 12, the methanol inlet pipe 103, the second methanol main unit 22, the second purge return pipe 102, and the exhaust fan 14. The flow control valve 161 and the hydrocarbon sensor 163 are opened. If the flow and hydrocarbon data are normal, the bench test of the second methanol main unit 22 can proceed. If the compressed air flow and pressure within the system are excessive, they can be adjusted using the bypass control valve 159 (e.g., a manual ball valve).

[0088] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A methanol main engine test ventilation system, used for conducting ventilation tests on a methanol main engine to be tested, wherein the methanol main engine to be tested is located in a test workshop, and the fuel pipe of the methanol main engine to be tested comprises a fuel inner pipe and a ventilation outer pipe which are sleeved together; characterized in that: It includes a first purge liquid return pipe, a second purge liquid return pipe, a methanol liquid inlet pipe, an airtight test pipeline, a first bench test pipeline, a second bench test pipeline and an exhaust fan; The first purge return pipe, the second purge return pipe, and the methanol inlet pipe are all double-walled pipes, and the double-walled pipes include an inner pipe and an outer pipe. The inner pipe is connected to the fuel inner pipe of the methanol host to be tested, and the outer pipe is sleeved outside the inner pipe to accommodate and circulate compressed air. The pipe wall of the first end of the outer pipe has a plurality of connecting holes for connecting to the ventilation outer pipe of the methanol host to be tested. The methanol host to be tested includes a first methanol host and a second methanol host; The first end of the airtight test pipeline is connected to a compressed air source, and the second end of the airtight test pipeline is connected to the outer tube of the methanol inlet pipe; The two ends of the first bench test pipeline are connected to the compressed air source and the exhaust fan respectively through the outer pipe of the methanol inlet pipe, the ventilation outer pipe of the first methanol main unit and the outer pipe of the first purge return pipe; The two ends of the second bench test pipeline are connected to the compressed air source and the exhaust fan respectively through the outer pipe of the methanol inlet pipe, the ventilation outer pipe of the second methanol main unit and the outer pipe of the second purge return pipe; Among them, the airtight test pipeline, the first bench test pipeline, the second bench test pipeline, and the exhaust fan are all located outside the test workshop.

2. The methanol host test ventilation system according to claim 1, characterized in that: A liquid supply tank and a liquid return tank are provided outside the test workshop, a first end of the inner tube of the methanol liquid inlet pipe is connected to the liquid supply tank, and a second end of the inner tube of the methanol liquid inlet pipe is connected to the fuel inlet of the first methanol main engine or the fuel inlet of the second methanol main engine; The first end of the inner tube of the first purge liquid return pipe is connected to the liquid return tank, and the second end of the inner tube of the first purge liquid return pipe is connected to the fuel outlet of the first methanol main engine; The first end of the inner tube of the second purge liquid return pipe is connected to the liquid return tank, and the second end of the inner tube of the second purge liquid return pipe is connected to the fuel outlet of the second methanol main engine.

3. The methanol host test ventilation system according to claim 1, characterized in that: A first shut-off valve is provided on the airtight test pipeline. Along the flow direction of compressed air in the pipeline, the first shut-off valve is located between the compressed air source and the outer tube of the methanol inlet pipe.

4. The methanol host test ventilation system according to claim 3, characterized in that: The first test bench pipeline is provided with a second shut-off valve, a third shut-off valve, a fourth shut-off valve, a fifth shut-off valve, a flow control valve, a pressure sensor and a hydrocarbon sensor; Wherein, along the flow direction of compressed air in the pipeline, the second shut-off valve is located upstream of the third shut-off valve, the flow control valve is located between the second shut-off valve and the third shut-off valve, and the second shut-off valve, the third shut-off valve and the flow control valve are all located upstream of the first purge return pipe; The fourth shut-off valve is located upstream of the fifth shut-off valve, the pressure sensor is located upstream of the fourth shut-off valve, and the fourth shut-off valve, the fifth shut-off valve and the pressure sensor are all located downstream of the first purge liquid return pipe; The hydrocarbon sensor is located between the fifth shut-off valve and the exhaust fan.

5. The methanol host test ventilation system according to claim 4, characterized in that: The second test bench pipeline is provided with a sixth shut-off valve and a seventh shut-off valve; The inlet of the sixth shut-off valve is connected to the compressed air source, the outlet of the sixth shut-off valve is connected to the inlet of the third shut-off valve, the inlet of the seventh shut-off valve is connected to the outer pipe of the second purge return pipe, and the outlet of the seventh shut-off valve is connected to the exhaust fan through the hydrocarbon sensor.

6. The methanol host test ventilation system according to claim 5, characterized in that: It also includes a main pipeline, the inlet of the main pipeline is connected to the compressed air source, and the outlet of the main pipeline is connected to the first shut-off valve, the second shut-off valve and the sixth shut-off valve respectively; A throttle valve is provided on the main pipeline.

7. The methanol host test ventilation system according to claim 1, characterized in that: A bypass control valve is also provided on the first test bench pipeline; The inlet and outlet of the bypass control valve are respectively connected to the inlet and outlet of the exhaust fan.

8. The methanol host test ventilation system according to claim 4, characterized in that: Also included is a first valve group control unit; The first valve group control unit is electrically connected to the first shut-off valve, the third shut-off valve, and the fourth shut-off valve to control the opening and closing of each shut-off valve.

9. The methanol host test ventilation system according to claim 5, characterized in that: It also includes a second valve group control unit, which is electrically connected to the fifth shut-off valve, the sixth shut-off valve and the seventh shut-off valve to control the opening and closing of each shut-off valve.

10. The methanol host test ventilation system according to claim 9, characterized in that: The methanol liquid supply system control unit of the methanol host to be tested is reused as the second valve group control unit.

Images