Methanol host test ventilation system

Abstract

The utility model provides a ventilation system for a methanol host test, which is used for carrying out 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] This utility model relates to the field of methanol diesel engines, and in particular to a test ventilation system for methanol main engine. Background Technology

[0002] With the International Maritime Organization (IMO) setting a goal of achieving net-zero emissions by around 2050 and establishing 2030 and 2040 as key milestones, low-carbon methanol dual-fuel diesel engines have become widely used. However, this also introduces new risks to bench testing of low-carbon methanol dual-fuel diesel engines during OEM production. To ensure the final assembly and testing workshop is a suitable location for intrinsically safe OEMs, a dual-walled pipe mechanical ventilation system is needed to protect the methanol supply system and reduce the risk of fire in the event of a methanol leak. The dual-walled pipe ventilation system is the most important protective measure for the methanol supply system, minimizing the risk of methanol leaks. When a methanol leak occurs, it can be quickly detected, the methanol supply system shut off, the OEM switched to fuel mode, and the leaked methanol diluted and discharged through ventilation.

[0003] However, the flammable nature of methanol fuel presents new safety challenges for OEMs' production bench tests. Traditional single-unit ventilation systems have the following problems:

[0004] 1. Each model requires a separate ventilation system, resulting in significant redundant investment in equipment;

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

[0006] 3. Complex system switching affects experimental efficiency;

[0007] It is evident that existing technologies suffer from problems such as complex ventilation system structures, poor adaptability, and difficulty in conducting tests on multiple aircraft models. Utility Model Content

[0008] This invention provides a ventilation system for methanol engine testing, which solves the problems of complex system structure, poor adaptability, and difficulty in testing multiple engine models in the prior art.

[0009] This utility model provides a ventilation system for testing methanol generators, used to conduct ventilation tests on methanol generators under test. The methanol generator under test is located in a test workshop. The fuel pipe of the methanol generator under test includes an inner fuel pipe and a ventilation outer pipe that are sleeved together. It includes a first purge return pipe, a second purge return pipe, a methanol inlet pipe, an airtightness 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. The double-walled pipe includes an inner pipe and an outer pipe. The inner pipe is connected to the fuel inner pipe of the methanol generator under test. The outer pipe is sleeved outside the inner pipe and is used to accommodate and circulate compressed air. The pipe wall at the first end of the outer pipe has multiple connecting holes for connecting to the ventilation outer pipe of the methanol generator under test.

[0011] The methanol generators to be tested include a first methanol generator and a second methanol generator;

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

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

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

[0015] The airtightness test pipeline, the first test frame pipeline, the second test frame pipeline, and the exhaust fan are all located outside the test workshop.

[0016] This invention, through the interconnection and coordination of airtight test pipelines, first test bench pipelines, second test bench pipelines, first purge return pipes, second purge return pipes, and methanol inlet pipes, can meet the different operating conditions of different methanol engine models (such as marine dual-fuel methanol engines), greatly improving the utilization efficiency of the test bench and the testing efficiency of the methanol engine. Furthermore, this system does not require a separate ventilation system for each methanol engine model, greatly reducing testing costs. In addition, the system has a simple pipeline structure, which is conducive to switching between different methanol engines under different test conditions, and is easy to operate with high testing efficiency.

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

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

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

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

[0021] Optionally, the first test bench is equipped 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] In this configuration, along the direction of compressed air flow 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 return pipe.

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

[0025] Optionally, the second test bench is equipped with a sixth shut-off valve and a seventh shut-off valve;

[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 main unit test ventilation system also includes a main pipeline, the inlet of which is connected to a compressed air source, and the outlet of which is connected to a first shut-off valve, a second shut-off valve, and a sixth shut-off valve, respectively.

[0028] A throttling valve is installed on the main pipeline.

[0029] This utility model embodiment, by setting the above-mentioned control valves (such as the first to seventh shut-off valves, flow control valves, throttle valves, etc.) on each pipeline, can flexibly control the opening and closing of each pipeline to meet the different test conditions of different models. At the same time, by setting the above-mentioned control valves, this utility model embodiment can improve the utilization rate of the pipeline, realize multiple test functions without adding pipelines, simplify the system structure, and improve test efficiency.

[0030] Optionally, a bypass control valve is also installed on the pipeline of the first test stand;

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

[0032] This utility model embodiment, by setting a bypass control valve between the inlet and outlet of the exhaust fan, can adjust the air flow and pressure in the pipeline through the bypass control valve, enriching the possibilities of operating parameters and improving the reliability and safety of system testing.

[0033] Optionally, the methanol main unit test ventilation system also 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 main unit test ventilation system also includes a second valve group control unit, which is electrically connected to the fifth, sixth and seventh shut-off valves to control the opening and closing of each shut-off valve.

[0036] Optionally, the methanol supply system control unit of the methanol generator to be tested can be reused as the second valve group control unit. Attached Figure Description

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

[0038] Figure 2 This is a schematic diagram of the ventilation system of the methanol main unit under test in one of the embodiments of this utility model.

[0039] Figure 3 This is a schematic diagram of the ventilation system of the methanol main engine under test in operating condition two according to an embodiment of this utility model;

[0040] Figure 4 This is a schematic diagram of the structure of the methanol main engine test ventilation system under operating condition three in an embodiment of this utility model.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1: Methanol main unit 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 piping; 12: Second test bench piping; 13: Air tightness test piping; 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: Throttling 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 generator to be tested; 21: First methanol generator; 22: Second methanol generator. Detailed Implementation

[0049] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection 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 in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

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

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

[0053] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0054] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0055] This utility model provides a methanol main engine test ventilation system 1. Please refer to [link / reference]. Figure 1This is used for ventilation tests on the methanol generator under test. The fuel pipes of the methanol generator under test include an inner fuel pipe and an outer ventilation pipe that are sleeved together. The methanol generator 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 pipe 13, a first test bench pipe 11, a second test bench pipe 12, and an exhaust fan 14.

[0056] The first purge return pipe 101, the second purge return pipe 102, and the methanol inlet pipe 103 are all double-walled pipes. The double-walled pipe includes an inner pipe and an outer pipe. The inner pipe is used to contain and circulate methanol. The inner pipe is connected to the fuel inner pipe of the methanol generator under test. The outer pipe is sleeved outside the inner pipe and is used to contain and circulate compressed air. The first end of the outer pipe has multiple connecting holes in the pipe wall for connecting to the ventilation outer pipe of the methanol generator under test.

[0057] Specifically, one end of the outer pipe of the double-walled tube is connected to the ventilation pipe of the methanol generator through sixteen circumferentially distributed 5mm diameter holes, and the other end is connected to an exhaust fan. The inner pipe serves as the methanol supply pipeline, and the outer pipe serves as the protective pipe. The space between the inner and outer pipes is continuously evacuated by an exhaust fan, which is configured as a negative pressure mechanical ventilation system with a ventilation capacity of at least 30 times per hour. When a leak occurs in the inner pipe or the airflow in the double-walled tube interlayer is low, it can be detected by a flow switch and a hydrocarbon sensor, and an alarm signal will be transmitted to the generator's safety system. Furthermore, the exhaust fan meets the explosion-proof safety requirements of the area and is located in a safe position.

[0058] The methanol main engine to be tested includes a first methanol main engine and a second methanol main engine. Those skilled in the art will understand that the first and second methanol main engines 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 the German engine manufacturer MAN Energy Solutions, and the second methanol main engine is a WinGD series methanol main engine developed by CSSC Winterthur Engine Co., Ltd.

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

[0060] like Figure 3 As shown, the two ends of the first test pipeline 11 are connected to the compressed air source and the exhaust fan 14 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, respectively.

[0061] like Figure 4As shown, the two ends of the second test pipeline 12 are connected to the compressed air source and the exhaust fan 14 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, respectively.

[0062] Among them, the airtightness test pipeline 13, the first test frame pipeline 11, the second test frame 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 one example implementation, such as... Figure 1 As shown, the parameters of the compressed air are 7-9 bar. Any device that can output compressed air that meets these parameters is within the scope of this utility model embodiment.

[0064] This invention, through the interconnection and cooperation of the airtightness test pipeline 13, the first test stand pipeline 11, the second test stand pipeline 12, the first purge return pipe 101, the second purge return pipe 102, and the methanol inlet pipe 103, can meet the testing requirements of different methanol generator models under different operating conditions, greatly improving the efficiency of the test bench and the testing efficiency of the methanol generator. Furthermore, this system does not require a separate ventilation system for each methanol generator model, greatly reducing testing costs. In addition, the system has a simple pipeline structure, which is conducive to switching between different methanol generators under different testing conditions. It is easy to operate and has high testing efficiency.

[0065] In one embodiment, a supply tank (not shown in the figure) and a return tank (not shown in the figure) are provided outside the test workshop. The first end of the inner tube of the methanol inlet pipe 103 is connected to the supply tank, and the second end of the inner tube of the methanol inlet pipe 103 is connected to the first methanol generator 21 (e.g., Figure 2 (as shown) fuel inlet or second methanol main unit 22 (e.g.) Figure 4 The fuel inlet is shown in the figure. 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 assembly), and the methanol 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 return pipe 101 is connected to the return tank (not shown in the figure), and the second end of the inner tube of the first purge return pipe 101 is connected to the first methanol generator 21 (e.g., Figure 2 (As shown) fuel outlet.

[0067] The first end of the inner tube of the second purge return pipe 102 is connected to the return 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 generator 22 (e.g., Figure 4 (As shown) fuel outlet.

[0068] Specifically, the aforementioned fuel inlet can be understood as the inlet of the fuel inner pipe of the methanol main unit to be tested (e.g., the first methanol main unit 21 or the second methanol main unit 22), and the aforementioned fuel outlet can be understood as the outlet of the fuel inner pipe of the methanol main unit to be tested.

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

[0070] For further implementation methods, please refer to Figure 1 and combined Figure 2 and Figure 3 Understood, the airtightness test pipeline 13 is equipped with a first shut-off valve 151, along the direction of compressed air flow in the pipeline (e.g., Figure 2 (As indicated by the middle arrow), the first shut-off valve 151 is located between the compressed air source and the outer pipe of the methanol inlet pipe 103.

[0071] Furthermore, such as Figure 3 As shown, the first test pipeline 11 is equipped 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 direction of compressed air flow in the pipeline (e.g. Figure 3 (In the direction indicated by the middle arrow), the second shut-off valve 152 is located upstream of the third shut-off valve 153, and the flow control valve 161 is located between the second shut-off valve 152 and the third shut-off valve 153. Furthermore, 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 return pipe 101.

[0073] The fourth shut-off valve 154 is located upstream of the fifth shut-off valve 155, and the pressure sensor 162 is located upstream of the fourth shut-off valve 154. The fourth shut-off valve 154, the fifth shut-off valve 155, and the pressure sensor 162 are all located downstream of the first purge return pipe 101. The hydrocarbon sensor 163 is located between the fifth shut-off valve 155 and the exhaust fan 14.

[0074] Those skilled in the art will understand that the flow control valve 161 can also be understood as a flow switch, used to monitor whether the compressed air volume is normal and to send an alarm signal when the flow is abnormal. The hydrocarbon sensor is used to monitor hazardous gases and to send an alarm signal when the concentration exceeds the standard. The number of valves can be set as needed. In one example embodiment, the number of flow control valves 161 is three. In another embodiment, two flow control valves 161 are located on a shared pipeline of the first test bench pipeline 11 and the second test bench pipeline 12, and the other is located 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, the first test pipeline 11 is also provided with a bypass control valve 159, the inlet and outlet of which are connected to the inlet and outlet of the exhaust fan 14, respectively.

[0076] This embodiment of the invention provides a bypass control valve 159 between the inlet and outlet of the exhaust fan 14. This bypass control valve 159 can adjust the air flow and pressure in the pipeline, enriching the possibilities of operating parameters and improving the reliability and safety of system testing.

[0077] In a further implementation, such as Figure 4 As shown, the second test bench pipeline 12 is equipped with a sixth shut-off valve 156 and a seventh shut-off valve 157.

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

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

[0081] This utility model embodiment involves installing the aforementioned control valves (e.g., the first shut-off valve 151~) on each pipeline.

[0082] The seventh shut-off valve 157, flow control valve 161, throttle valve 158, etc. can flexibly control the on / off of each pipeline to match different test conditions of different models. At the same time, through the setting of the above control valves, this utility model embodiment can improve the utilization rate of pipelines, realize multiple test functions without adding pipelines, simplify the system structure, and improve test efficiency.

[0083] This utility model does not limit the valve group opening and closing control system. For example, it can be manually controlled or electrically controlled. There are no restrictions on the type of valve, as long as it can play the corresponding shut-off, throttling, and flow regulation functions. In one example embodiment, the first shut-off valve 151, 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.

[0084] In a further implementation, such as Figures 1-4 As shown, the methanol generator 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. The first valve group control unit 181 controls the opening and closing of each valve by controlling air. In other alternative embodiments, the valve type can also be other types, such as electric valves, solenoid valves, etc. In one example embodiment, the first shut-off valve 151 is a normally closed valve in the event of failure, and the third shut-off valve 153 and the fourth shut-off valve 154 are normally open valves in the event of failure. The methanol generator 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 supply system control unit of the methanol generator 2 under test (e.g., the first methanol generator 21 or the second methanol generator 22) is reused as the second valve group control unit.

[0085] The following describes the various test procedures of the methanol main engine test ventilation system 1 according to an embodiment of this utility model:

[0086] When conducting an airtightness test on a double-walled pipe system, please refer to [link / reference]. Figure 2 The direction of compressed air is as follows Figure 2As shown by the middle arrow, the first valve group control unit 181 first controls the third shut-off valve 153 and the fourth shut-off valve 154 to close, and controls the first shut-off valve 151 to open. The 7 bar compressed air after throttling and pressure reduction is pressurized through the first shut-off valve 151 through the air tightness test pipeline 13, the methanol inlet pipe 103, the methanol host to be tested 2, and the first purge return pipeline 101 to the space between the third shut-off valve 153 and the fourth shut-off valve 154. 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.

[0087] Before conducting the bench test of the first methanol main unit 21, please refer to [link / reference needed]. Figure 3 The direction of compressed air is as follows Figure 3 As indicated by the middle arrow, the second shut-off valve 152 is opened via the second valve group control unit (e.g., the methanol supply system control unit or the main unit dual-wall pipe ventilation control system), and the exhaust fan 14 is started. The third shut-off valve 153 and the fourth shut-off valve 154 are opened via the first valve group control unit 181, and the first shut-off valve 151 is closed. The third and fourth shut-off valves 153 and 154 are normally open valves if they fail, and the first shut-off valve 151 is normally closed if it fails. The fifth shut-off valve 155 is opened via the second valve group control unit (e.g., the methanol supply system control unit or the main unit dual-wall pipe ventilation control system), while the remaining valves remain closed. This allows the 7 bar compressed air, after throttling and pressure reduction, to flow through the first test bench 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 all flow and hydrocarbon data are normal, the bench test of the first methanol main unit 21 can be performed. When the compressed air flow and pressure in the system are too high, they can be adjusted by the bypass control valve 159 (e.g., a manual ball valve).

[0088] Before conducting the bench test of the second methanol main unit 22, such as Figure 4As shown, the sixth shut-off valve 156 and the seventh shut-off valve 157 are opened through the second valve group control unit (e.g., the methanol supply system control unit or the main unit's dual-wall pipe ventilation control system), the exhaust fan 14 is started, and the third shut-off valve 153 and the fourth shut-off valve 154 are opened (the third shut-off valve 153 and the fourth shut-off valve 154 are normally open valves in case of failure). The remaining valves remain closed, allowing the 7 bar compressed air after throttling and pressure reduction 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 all flow and hydrocarbon data are normal, the bench test of the second methanol main unit 22 can be performed. When the compressed air flow and pressure in the system are too high, they can be adjusted through the bypass control valve 159 (e.g., a manual ball valve).

[0089] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A ventilation system for testing a methanol generator, used for conducting ventilation tests on a methanol generator under test, wherein the methanol generator under test is located in a test workshop, and the fuel pipe of the methanol generator under test includes an inner fuel pipe and an outer ventilation pipe sleeved together; characterized in that, It includes a first purge return pipe, a second purge return pipe, a methanol inlet pipe, an airtightness test pipeline, a first test bench pipeline, a second test bench 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. The double-walled pipe includes an inner pipe and an outer pipe. The inner pipe is connected to the fuel inner pipe of the methanol generator under test. The outer pipe is sleeved outside the inner pipe and is used to accommodate and circulate compressed air. The pipe wall at the first end of the outer pipe has multiple connecting holes for connecting to the ventilation outer pipe of the methanol generator under test. The methanol generator to be tested includes a first methanol generator and a second methanol generator; The first end of the airtightness test pipeline is connected to a compressed air source, and the second end of the airtightness test pipeline is connected to the outer pipe of the methanol inlet pipe; 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 outer pipe of the ventilation of the first methanol main unit and the outer pipe of the first purge return pipe. The two ends of the second 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 outer pipe of the second methanol main unit ventilation pipe and the outer pipe of the second purge return pipe; The airtightness test pipeline, the first test bench pipeline, the second test bench pipeline, and the exhaust fan are all located outside the test workshop.

2. The methanol host test ventilation system of claim 1, wherein, The test workshop is equipped with a liquid supply tank and a liquid return tank. The first end of the inner tube of the methanol inlet pipe is connected to the liquid supply tank, and the second end of the inner tube of the methanol inlet pipe is connected to the fuel inlet of the first methanol main unit or the fuel inlet of the second methanol main unit. The first end of the inner tube of the first purge return pipe is connected to the return tank, and the second end of the inner tube of the first purge return pipe is connected to the fuel outlet of the first methanol main unit. The first end of the inner tube of the second purge return pipe is connected to the return tank, and the second end of the inner tube of the second purge return pipe is connected to the fuel outlet of the second methanol main unit.

3. The methanol host test ventilation system of claim 1, wherein, The airtightness test pipeline is equipped with a first shut-off valve, which is located between the compressed air source and the outer pipe of the methanol inlet pipe along the flow direction of compressed air in the pipeline.

4. The methanol host test ventilation system of claim 3, wherein, The first test bench pipeline is equipped 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; In this configuration, 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 return pipe. The hydrocarbon sensor is located between the fifth shut-off valve and the exhaust fan.

5. The methanol host test ventilation system of claim 4, wherein, The second test bench is equipped 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 of claim 5, wherein, It also includes a main pipeline, the inlet of which is connected to the compressed air source, and the outlet of which is connected to the first shut-off valve, the second shut-off valve and the sixth shut-off valve respectively. A throttling valve is installed on the main pipeline.

7. The methanol host test ventilation system of claim 1, wherein, The first test bench is also equipped with a bypass control valve; The inlet and outlet of the bypass control valve are respectively connected to the inlet and outlet of the exhaust fan.

8. The methanol main engine test ventilation system according to claim 4, characterized in that, It also includes the 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 venting system of claim 5, wherein, 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 of claim 9, wherein, The methanol supply system control unit of the methanol generator under test is reused as the second valve group control unit.

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