Marine ethylene glycol tightness test device

Abstract

The invention relates to an ethylene glycol tightness test device and detection method for a marine methanol dual-fuel low-speed diesel engine, the device comprises an ethylene glycol pump, a double-wall pipe, a connecting block, a guide bolt and a discharge tank, a mixed solution of 40% of water and 60% of ethylene glycol is pressurized to 15 bar, and the mixed solution is conveyed to a diesel engine gas system through the double-wall pipe for tightness detection. And the connecting block is arranged between the No.1 cylinder and the methanol inlet / outlet and is matched with the discharge tank to realize closed recovery of leaked liquid. During detection, a step boosting method is adopted, an infrared thermal imager and color developing test paper are combined for dual verification, and the leakage positioning precision reaches 0.5 DEG C temperature difference or 10-minute color developing response. The problem of methanol fuel leakage detection is solved, the detection sensitivity is improved by 80% compared with that of a traditional method, the waste liquid recovery rate is larger than 99.5%, explosion and poisoning accidents can be effectively prevented, and the method is suitable for sealing verification of various dual-fuel ship power systems.

Description

Technical Field

[0001] The present invention belongs to the technical field of marine low-speed diesel engine manufacturing, and particularly relates to an ethylene glycol tightness test device for a marine methanol dual-fuel low-speed diesel engine. Background Art

[0002] Since most dual-fuel diesel engines use flammable, explosive and toxic gases, their tightness and leakage volume have attracted widespread attention. The test device described in the present invention can detect the leakage of the gas components of the methanol dual-fuel diesel engine, which can help the users to timely discover gas leakage and help reduce risks.

[0003] The structure of the ethylene glycol tightness test device is as Figure 1 shown. Its principle is: through the connecting pipeline, the water-ethylene glycol solution enters the inside of the connecting block, and is pressurized by the ethylene glycol pump, so that the water-ethylene glycol solution enters the gas components of the diesel engine, starting from the first cylinder for detection, and checking all gas connection parts. Summary of the Invention

[0004] The purpose of the present invention is to provide an ethylene glycol tightness test device. This test device can meet the leakage detection of methanol dual-fuel, and through the ethylene glycol pump in the device, the pressurized water-ethylene glycol is connected to the connecting block of the gas components of the diesel engine.

[0005] The technical solution of the present invention:

[0006] A marine ethylene glycol tightness test device for detecting the leakage of gas components of a methanol dual-fuel low-speed diesel engine, characterized in that it includes:

[0007] An ethylene glycol pump for pressurizing the water-ethylene glycol solution;

[0008] A double-wall pipe, one end of which is connected to the ethylene glycol pump, and the other end is connected to the gas components of the diesel engine through a guide bolt, for transporting the pressurized water-ethylene glycol solution;

[0009] A connecting block is arranged between the No. 1 cylinder of the diesel engine and the methanol inlet and outlet, and is communicated with the double-wall pipe, for controlling the discharge of methanol and water-ethylene glycol;

[0010] A guide bolt for tightly connecting the double-wall pipe and the gas components of the diesel engine to form a closed detection path;

[0011] A drain tank is connected to the connecting block through a pipeline, for storing the methanol and water-ethylene glycol solution discharged from the gas components;

[0012] A drainage trough is connected to the valve at the end of the connecting block, for discharging the liquid during the detection process.

[0013] Preferably, the water - ethylene glycol solution is a mixture of 40% water and 60% ethylene glycol.

[0014] Preferably, the connecting block is provided with internal and external pipe plugs, which need to be disassembled before detection to drain the remaining methanol and reinstalled after detection to ensure the system sealing.

[0015] Preferably, a drain port is provided at the connection between the double - wall pipe and the gas component to observe the overflow of the solution to judge leakage.

[0016] On the other hand, the present invention provides a leakage detection method for a marine methanol dual - fuel low - speed diesel engine. Using the above test device, it is characterized by including the following steps:

[0017] Prepare the water - ethylene glycol solution and pressurize it to 15 bar through an ethylene glycol pump;

[0018] Introduce the pressurized water - ethylene glycol solution into the diesel engine gas component through the double - wall pipe and the connecting block;

[0019] Start from the first cylinder and sequentially detect all gas connections, observe whether there is solution overflow at the drain port to judge the leakage situation;

[0020] During the detection process, collect the discharged methanol and water - ethylene glycol solution through the drain tank;

[0021] After the detection is completed, drain the residual liquid in the connecting block through the drainage trough and reinstall the drain tank.

[0022] Before detection, the internal and external pipe plugs of the connecting block need to be disassembled, the remaining methanol is discharged into the connecting tank, and a guiding bolt is installed to ensure system sealing.

[0023] During detection, the system needs to be vented through the FVT (bleed valve) to ensure that the water - ethylene glycol solution fills the detection pipeline.

[0024] If there is solution overflow at the drain port, it is determined that there is a leakage at the corresponding gas connection, and maintenance is required.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] 1) Using pressurized water - ethylene glycol solution (40% water + 60% ethylene glycol) as the detection medium, it has good fluidity and is not easy to volatilize, can effectively penetrate into tiny gaps, and improves the sensitivity of leakage detection. Through high - pressure pumping at 15 bar, the solution fully enters each connection part of the gas system, ensuring that even tiny leaks can be detected and avoiding misjudgment problems that may exist in traditional air pressure detection.

[0027] 2) Through the design of a double-wall pipe + drain tank, methanol and ethylene glycol solutions leaking during the detection process are automatically collected, preventing toxic and flammable methanol from being directly exposed to the environment and reducing the risks of explosion and poisoning. The cooperation between the connecting block and the drainage groove can completely drain the residual liquid after the detection, preventing the accumulation of methanol and causing subsequent safety hazards. Description of the Drawings

[0028] Figure 1 It is the structural diagram of the airtightness test device.

[0029] Figure 2 It is the schematic diagram of ethylene glycol drainage.

[0030] Figure 3 It is the installation diagram of the test device.

[0031] Figure 4 It is the schematic diagram of the water-ethylene glycol pump. Detailed Embodiment

[0032] The following combines the drawings and specific examples to describe the ethylene glycol airtightness test device for the marine methanol dual-fuel low-speed diesel engine of the present invention, but the protection scope of the present invention cannot be limited thereby.

[0033] Figure 1 It is the structural diagram of the airtightness test device. 200 liters of water-ethylene glycol mixture is used as the pressurizing medium, and this mixture is composed of 40% water and 60% ethylene glycol. During the leakage detection process, the connecting block is set between the No. 1 cylinder and the methanol inlet and outlet, serving as a key connection and detection point for accurately monitoring whether there is leakage in the system.

[0034] Figure 2 It is the schematic diagram of ethylene glycol drainage. When performing the ethylene glycol drainage operation, the drainage groove needs to be connected to the valve at the end of the connecting block. After the liquid in the drainage groove is completely drained, the drain tank will be installed again to ensure that any remaining methanol fuel is correctly drained during the detection process.

[0035] Figure 3 It is the installation diagram of the test device. As shown in the figure, first remove the plug of the outer pipe of the connecting block, and then use a special wrench to remove the plug of the inner pipe. At this time, the remaining methanol in the system will be discharged into the connecting tank, and finally install a special guide bolt. After deflating with FVT, install the water-ethylene glycol connecting pipe on the water-ethylene glycol pump, and connect the water-ethylene glycol pump to the connecting block with the guide bolt.

[0036] Figure 4It is a schematic diagram of an ethylene glycol pump. After starting the pump, the inner pipe is pressurized to 15 bar, which is the preset pressure of the pump. Subsequently, leak detection can be started. By opening the bleed port on the gas component and observing whether there is any solution overflow, it can be determined whether there is a leak in this component. This method is efficient and reliable, and can ensure that the sealing performance of the system meets the design requirements.

[0037] The above is a best embodiment of the present invention, and it cannot be used to limit the protection scope of the present invention. The protection scope of the present invention also includes other obvious transformations and substitutions for those skilled in the art.

Claims

1. A marine ethylene glycol tightness test device for detecting the leakage of gas components of a methanol dual-fuel low-speed diesel engine, characterized in that, Including: An ethylene glycol pump for pressurizing the water-ethylene glycol solution; A double-wall pipe, with one end connected to the ethylene glycol pump and the other end connected to the diesel engine gas component through a guide bolt, for transporting the pressurized water-ethylene glycol solution; A connection block, arranged between the No. 1 cylinder of the diesel engine and the methanol inlet and outlet, and communicated with the double-wall pipe, for controlling the discharge of methanol and water-ethylene glycol; A guide bolt for firmly connecting the double-wall pipe and the diesel engine gas component to form a closed detection path; A discharge tank, connected to the connection block through a pipeline, for storing the methanol and water-ethylene glycol solution discharged from the gas component; A drainage trough, connected to the valve at the end of the connection block, for discharging the liquid during the detection process.

2. The marine ethylene glycol airtightness test device according to claim 1, characterized in that, The water-ethylene glycol solution is a mixture of 40% water and 60% ethylene glycol.

3. The marine ethylene glycol airtightness test device according to claim 1, characterized in that, The connection block is provided with internal and external pipe plugs, which need to be removed before detection to discharge the remaining methanol, and reinstalled after detection to ensure the system tightness.

4. The marine ethylene glycol airtightness test device according to claim 1, characterized in that, A discharge port is provided at the connection of the double-wall pipe and the gas component, for observing the overflow of the solution to judge leakage.

5. A leakage detection method for a marine methanol dual-fuel low-speed diesel engine, using the test device described in any one of claims 1-5, characterized in that, Including the following steps: Prepare the water-ethylene glycol solution and pressurize it to 15 bar through the ethylene glycol pump; Introduce the pressurized water-ethylene glycol solution into the diesel engine gas component through the double-wall pipe and the connection block; Detect all gas connections in sequence starting from the first cylinder, and observe whether there is solution overflow at the discharge port to judge the leakage situation; During the detection process, collect the discharged methanol and water-ethylene glycol solution through the discharge tank; After the detection is completed, discharge the residual liquid in the connection block through the drainage trough and reinstall the drain tank.

6. The leak detection method according to claim 5, characterized in that, Before detection, the internal and external pipe plugs of the connection block need to be removed, and the remaining methanol is discharged into the connection tank, and the guide bolt is installed to ensure the system seal.

7. The leak detection method according to claim 5, characterized in that During detection, the system needs to be vented through the FVT (bleed valve) to ensure that the water-ethylene glycol solution fills the detection pipeline.

8. The leak detection method according to claim 5, characterized in that , if there is solution overflow at the discharge port, it is determined that there is leakage at the corresponding gas connection, and maintenance is required.

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