Methanol fuel ship ethylene glycol water tank monitoring system and monitoring method thereof

Abstract

The invention discloses a methanol fuel ship ethylene glycol water tank monitoring system and a monitoring method thereof, the methanol fuel ship ethylene glycol water tank monitoring system comprises an ethylene glycol water tank, a partition plate, a mechanical exhaust fan, a hydrocarbon sensor, a liquid level sensor, a heater, a remote control valve and a three-way remote control valve, the partition plate divides the ethylene glycol water tank into an ethylene glycol large cabin and an ethylene glycol isolation small cabin, and the partition plate is provided with an overflow hole; the hydrocarbon sensor is arranged at the upper end of the ethylene glycol isolation small cabin, the liquid level sensor and the heater are arranged at the lower end of the ethylene glycol isolation small cabin, the mechanical exhaust fan is connected with an air outlet of the ethylene glycol isolation small cabin, and a first liquid outlet of the ethylene glycol large cabin is connected with a first port of the three-way remote control valve. A second port of the three-way remote control valve is connected with one end of the remote control valve and a liquid inlet and outlet of the ethylene glycol isolation small cabin, and the other end of the remote control valve is connected with a second liquid outlet in the lower end of the ethylene glycol large cabin. The problems of misjudgment of methanol leakage and incapability of treating ethylene glycol water pollution in time in the prior art are solved.

Description

Technical Field

[0001] The invention relates to a monitoring system and a monitoring method thereof, in particular to an ethylene glycol water tank monitoring system and a monitoring method thereof for a methanol fuel ship, belonging to the technical field of ships. Background Art

[0002] The methanol fuel of the methanol fuel ship is heated or cooled by ethylene glycol water to reach the temperature requirement of the methanol equipment inlet. In the process of ethylene glycol water circulation, leakage is inevitable. When the methanol solution leaks into the ethylene glycol water, effective monitoring and treatment methods are one of the important safety factors of the methanol fuel ship. The monitoring and treatment of ethylene glycol water leakage is mainly through the following designs: The pressure of methanol fuel is greater than that of ethylene glycol water. Once a leak occurs, methanol fuel will leak into the ethylene glycol water solution, causing the level of the ethylene glycol water tank to rise. When the set level is detected, a high level alarm will be issued, thereby monitoring the leakage of methanol solution. The ethylene glycol water mixed with methanol solution will be manually emptied from the ethylene glycol water tank by the crew at a specific port and replaced with a new batch of ethylene glycol water that meets the requirements.

[0003] With the existing design, under severe sea conditions, the ship will experience a large roll or pitch, and the liquid level in the ethylene glycol water tank will change greatly, which may trigger a high liquid level alarm and lead to a false judgment of methanol solution leakage, thus affecting the normal use of methanol fuel. In addition, ethylene glycol water mixed with methanol solution is a toxic chemical that cannot be discharged directly into the sea. It can only be processed and replaced with new ethylene glycol water at designated ports, which is very inconvenient. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a monitoring system and a monitoring method for an ethylene glycol water tank of a methanol fuel ship, so as to solve the problems of misjudgment of methanol leakage and failure to timely handle ethylene glycol water pollution in the prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: A monitoring system for an ethylene glycol water tank of a methanol fuel ship comprises an ethylene glycol water tank, a partition, a mechanical exhaust fan, a hydrocarbon sensor, a liquid level sensor, a heater, a remote control valve and a three-way remote control valve, wherein the partition separates the ethylene glycol water tank into a large ethylene glycol compartment and a small ethylene glycol isolation compartment, and an overflow hole is provided at the upper end of the partition, the hydrocarbon sensor is arranged at the upper end of the small ethylene glycol isolation compartment, the liquid level sensor and the heater are arranged at the lower end of the small ethylene glycol isolation compartment, one end of the mechanical exhaust fan is connected to an air outlet at the upper end of the small ethylene glycol isolation compartment, a first liquid outlet at the lower end of the large ethylene glycol compartment is connected to port No. 1 of the three-way remote control valve, port No. 2 of the three-way remote control valve is connected to one end of the remote control valve and a liquid inlet and outlet at the lower end of the small ethylene glycol isolation compartment, and the other end of the remote control valve is connected to a second liquid outlet at the lower end of the large ethylene glycol compartment.

[0006] Furthermore, a ventilation tube is provided at the upper end of the ethylene glycol tank, one end of the ventilation tube is fixed at the upper end of the ethylene glycol tank and communicated with the inner cavity of the ethylene glycol tank, and the other end of the ventilation tube is arranged in a safe area.

[0007] Furthermore, the air vent tube is an inverted U-shaped air vent tube.

[0008] Furthermore, the heater is an electric heater, and a start-stop switch is provided on the electric heater.

[0009] Furthermore, the other end of the mechanical exhaust fan is connected to one end of the ventilation cap, and the other end of the ventilation cap is arranged in a safe area.

[0010] Furthermore, port No. 3 of the three-way remote control valve is connected to an ethylene glycol water circulation system.

[0011] A methanol fuel ship ethylene glycol water tank monitoring system comprises the following steps: When the liquid level sensor triggers the liquid level alarm signal, the start-stop switch is turned on, and the electric heater starts to heat the ethylene glycol water overflowing into the ethylene glycol isolation small compartment. When the ethylene glycol water in the ethylene glycol isolation small compartment is heated to 70°C, it is determined whether the hydrocarbon sensor triggers the hydrocarbon alarm signal. If the hydrocarbon sensor triggers the hydrocarbon alarm signal, it means that the ethylene glycol water in the ethylene glycol isolation small compartment is overflowed due to the leakage of methanol fuel into the ethylene glycol large compartment; if the hydrocarbon sensor does not trigger the hydrocarbon alarm signal, it means that the ethylene glycol water in the ethylene glycol isolation small compartment is overflowed due to the roll or pitch of the ship; When the hydrocarbon sensor triggers the hydrocarbon alarm signal, the remote control valve opens, allowing the glycol water mixed with methanol fuel in the glycol large tank to flow into the glycol isolation small tank, and the electric heater continues to heat to vaporize and volatilize the methanol fuel mixed in the glycol water in the glycol water tank; when the remote control valve is opened, the mechanical exhaust fan is started synchronously, with the air vent as the air inlet and the air vent cap as the air outlet, to discharge the vaporized and volatilized methanol fuel to a safe area; When the hydrocarbon sensor no longer detects methanol, the start-stop switch is turned off to stop the electric heater from heating. When the start-stop switch is turned off, the remote control valve is closed and the mechanical exhaust fan also stops working synchronously. When the remote control valve is closed, ports 2 and 3 of the three-way remote control valve are controlled to be connected, and ports 1 and 3 of the three-way remote control valve are closed, so that the ethylene glycol water in the ethylene glycol isolation small compartment flows into the ethylene glycol water circulation system as the pipeline holding amount of the ethylene glycol water circulation system; when the liquid level switch no longer detects the liquid level alarm signal, ports 2 and 3 of the three-way remote control valve are closed, and ports 1 and 3 of the three-way remote control valve are opened, so that the ethylene glycol water in the ethylene glycol large compartment flows into the ethylene glycol water circulation system to restore the ethylene glycol water circulation system to normal operating conditions.

[0012] Compared with the prior art, the present invention has the following advantages and effects: the present invention provides a monitoring system and a monitoring method for an ethylene glycol water tank of a methanol fuel ship, which accurately judges methanol leakage by separating large and small cabins and heating the ethylene glycol water in the small cabin in combination with liquid level and hydrocarbon detection, thereby solving the problem that in severe sea conditions, the ship experiences a large roll or pitch, triggering a high liquid level alarm in the ethylene glycol water tank, and causing erroneous judgment of methanol solution leakage; at the same time, the methanol fuel leaked into the ethylene glycol water is heated and volatilized by heating and discharged to a safe area by a mechanical exhaust fan, thereby solving the problem that the prior art cannot promptly handle methanol pollution in ethylene glycol water. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of an ethylene glycol water tank monitoring system for a methanol fuel ship of the present invention. DETAILED DESCRIPTION

[0014] In order to elaborate on the technical scheme adopted by the present invention to achieve the predetermined technical purpose, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments, and the technical means or technical features in the embodiments of the present invention can be replaced without paying creative work. The present invention will be described in detail below with reference to the drawings and in conjunction with the embodiments.

[0015] like Figure 1 As shown, a monitoring system for ethylene glycol water tanks of methanol fuel ships of the present invention comprises an ethylene glycol water tank 1, a partition 2, a mechanical exhaust fan 3, a hydrocarbon sensor 4, a liquid level sensor 5, a heater 6, a remote control valve 7 and a three-way remote control valve 8. The ethylene glycol water tank 1 is used to store ethylene glycol water as a heating or cooling medium for methanol fuel, and absorbs the thermal expansion and contraction of the ethylene glycol water during the circulation process. The partition 2 separates the ethylene glycol water tank 1 into a large ethylene glycol tank 9 and a small ethylene glycol isolation tank 10, and an overflow hole 11 is opened at the upper end of the partition 2, which is used for overflowing into the small ethylene glycol isolation tank 10 after the liquid level of the large ethylene glycol tank in the ethylene glycol water tank rises to the overflow hole position. A hydrocarbon sensor 4 is arranged at the upper end of the ethylene glycol isolation cabin 10 to detect whether methanol gas exists, a liquid level sensor 5 and a heater 6 are arranged at the lower end of the ethylene glycol isolation cabin 10 to monitor the liquid level in the ethylene glycol cabin, one end of the mechanical exhaust fan 3 is connected to the air outlet at the upper end of the ethylene glycol isolation cabin 10, the first liquid outlet at the lower end of the ethylene glycol cabin 9 is connected to port No. 1 of the three-way remote control valve 8, port No. 2 of the three-way remote control valve 8 is connected to one end of the remote control valve 7 and the liquid inlet and outlet at the lower end of the ethylene glycol isolation cabin 10, and the other end of the remote control valve 7 is connected to the second liquid outlet at the lower end of the ethylene glycol cabin 9.

[0016] A vent pipe 12 is provided at the upper end of the glycol tank 9 for ventilation of the glycol water tank. One end of the vent pipe 12 is fixed to the upper end of the glycol tank 9 and communicated with the inner cavity of the glycol tank 9, and the other end of the vent pipe 12 is provided in a safe area. The vent pipe 12 is an inverted U-shaped vent pipe, which can effectively prevent the glycol water in the glycol water tank 1 from leaking sideways.

[0017] The heater 6 is an electric heater, and a start-stop switch 13 is provided on the electric heater for connecting and disconnecting the electric heater.

[0018] The other end of the mechanical exhaust fan 3 is connected to one end of the air permeable cap 14, and the other end of the air permeable cap 14 is arranged in a safe area.

[0019] Port No. 3 of the three-way remote control valve 8 is connected to the ethylene glycol water circulation system.

[0020] A methanol fuel ship ethylene glycol water tank monitoring system comprises the following steps: When the liquid level sensor triggers the liquid level alarm signal, the start-stop switch is turned on, and the electric heater begins to heat the ethylene glycol water overflowing into the ethylene glycol isolation cabin. When the ethylene glycol water in the ethylene glycol isolation cabin is heated to 70°C, it is determined whether the hydrocarbon sensor triggers the hydrocarbon alarm signal. If the hydrocarbon sensor triggers the hydrocarbon alarm signal, it means that the ethylene glycol water in the ethylene glycol isolation cabin is overflowed due to the leakage of methanol fuel into the ethylene glycol large cabin; if the hydrocarbon sensor does not trigger the hydrocarbon alarm signal, it means that the ethylene glycol water in the ethylene glycol isolation cabin is overflowed due to the roll or pitch of the ship.

[0021] When the hydrocarbon sensor triggers the hydrocarbon alarm signal, the remote control valve opens, allowing the ethylene glycol water mixed with methanol fuel in the ethylene glycol large tank to flow into the ethylene glycol isolation small tank, and the electric heater continues to heat to vaporize and volatilize the methanol fuel mixed in the ethylene glycol water in the ethylene glycol water tank; when the remote control valve is opened, the mechanical exhaust fan is started synchronously, with the air vent pipe as the air inlet and the air vent cap as the air outlet, to discharge the vaporized and volatilized methanol fuel to a safe area.

[0022] When the hydrocarbon sensor no longer detects methanol reset, the start-stop switch is turned off to stop the electric heater from heating. When the start-stop switch is turned off, the remote control valve is closed and the mechanical exhaust fan also stops working synchronously.

[0023] When the remote control valve is closed, ports 2 and 3 of the three-way remote control valve are controlled to be connected, and ports 1 and 3 of the three-way remote control valve are closed, so that the ethylene glycol water in the ethylene glycol isolation small compartment flows into the ethylene glycol water circulation system as the pipeline holding amount of the ethylene glycol water circulation system; when the liquid level switch no longer detects the liquid level alarm signal, ports 2 and 3 of the three-way remote control valve are closed, and ports 1 and 3 of the three-way remote control valve are opened, so that the ethylene glycol water in the ethylene glycol large compartment flows into the ethylene glycol water circulation system to restore the ethylene glycol water circulation system to normal operating conditions.

[0024] The present invention provides a monitoring system and a monitoring method for an ethylene glycol water tank of a methanol fuel ship. The system separates large and small cabins and heats the ethylene glycol water in the small cabin, combines liquid level and hydrocarbon detection to accurately judge methanol leakage, thereby solving the problem that in severe sea conditions, the ship experiences a large roll or pitch, triggering a high liquid level alarm in the ethylene glycol water tank, and causing erroneous judgment of methanol solution leakage. At the same time, the methanol fuel leaked into the ethylene glycol water is heated and volatilized and discharged to a safe area through a mechanical exhaust fan, thereby solving the problem that the prior art cannot promptly handle methanol pollution in the ethylene glycol water.

[0025] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent replacement and improvement made to the above embodiments without departing from the content of the technical solution of the present invention, based on the technical essence of the present invention, within the spirit and principles of the present invention, still fall within the protection scope of the technical solution of the present invention.

Claims

1. A methanol fuel ship ethylene glycol water tank monitoring system, characterized by: The utility model comprises an ethylene glycol water tank, a partition, a mechanical exhaust fan, a hydrocarbon sensor, a liquid level sensor, a heater, a remote control valve and a three-way remote control valve. The partition separates the ethylene glycol water tank into a large ethylene glycol compartment and a small ethylene glycol isolation compartment, and an overflow hole is opened at the upper end of the partition. The hydrocarbon sensor is arranged at the upper end of the small ethylene glycol isolation compartment, and the liquid level sensor and the heater are arranged at the lower end of the small ethylene glycol isolation compartment. One end of the mechanical exhaust fan is connected to the air outlet at the upper end of the small ethylene glycol isolation compartment, the first liquid outlet at the lower end of the large ethylene glycol compartment is connected to port No. 1 of the three-way remote control valve, port No. 2 of the three-way remote control valve is connected to one end of the remote control valve and the liquid inlet and outlet at the lower end of the small ethylene glycol isolation compartment, and the other end of the remote control valve is connected to the second liquid outlet at the lower end of the large ethylene glycol compartment.

2. The ethylene glycol water tank monitoring system for methanol fuel ships according to claim 1 is characterized by: The upper end of the ethylene glycol tank is provided with a ventilation tube, one end of which is fixed to the upper end of the ethylene glycol tank and communicated with the inner cavity of the ethylene glycol tank, and the other end of which is arranged in a safe area.

3. The ethylene glycol water tank monitoring system for methanol fuel ships according to claim 2 is characterized by: The ventilation tube adopts an inverted U-shaped ventilation tube.

4. The ethylene glycol water tank monitoring system for methanol fuel ships according to claim 1 is characterized by: The heater is an electric heater, and a start-stop switch is provided on the electric heater.

5. The ethylene glycol water tank monitoring system for methanol fuel ships according to claim 1 is characterized by: The other end of the mechanical exhaust fan is connected to one end of the ventilation cap, and the other end of the ventilation cap is arranged in a safe area.

6. The ethylene glycol water tank monitoring system for methanol fuel ships according to claim 1, characterized in that: Port No. 3 of the three-way remote control valve is connected to the ethylene glycol water circulation system.

7. A monitoring system for ethylene glycol water tanks for methanol fuel ships according to any one of claims 1 to 6, characterized in that The following steps are involved: When the liquid level sensor triggers the liquid level alarm signal, the start-stop switch is turned on, and the electric heater starts to heat the ethylene glycol water overflowing into the ethylene glycol isolation small compartment. When the ethylene glycol water in the ethylene glycol isolation small compartment is heated to 70°C, it is determined whether the hydrocarbon sensor triggers the hydrocarbon alarm signal. If the hydrocarbon sensor triggers the hydrocarbon alarm signal, it means that the ethylene glycol water in the ethylene glycol isolation small compartment is overflowed due to the leakage of methanol fuel into the ethylene glycol large compartment; if the hydrocarbon sensor does not trigger the hydrocarbon alarm signal, it means that the ethylene glycol water in the ethylene glycol isolation small compartment is overflowed due to the roll or pitch of the ship; When the hydrocarbon sensor triggers the hydrocarbon alarm signal, the remote control valve opens, allowing the glycol water mixed with methanol fuel in the glycol large tank to flow into the glycol isolation small tank, and the electric heater continues to heat to vaporize and volatilize the methanol fuel mixed in the glycol water in the glycol water tank; when the remote control valve is opened, the mechanical exhaust fan is started synchronously, with the air vent as the air inlet and the air vent cap as the air outlet, to discharge the vaporized and volatilized methanol fuel to a safe area; When the hydrocarbon sensor no longer detects methanol, the start-stop switch is turned off to stop the electric heater from heating. When the start-stop switch is turned off, the remote control valve is closed and the mechanical exhaust fan also stops working synchronously. When the remote control valve is closed, ports 2 and 3 of the three-way remote control valve are controlled to be connected, and ports 1 and 3 of the three-way remote control valve are closed, so that the ethylene glycol water in the ethylene glycol isolation small compartment flows into the ethylene glycol water circulation system as the pipeline holding amount of the ethylene glycol water circulation system; when the liquid level switch no longer detects the liquid level alarm signal, ports 2 and 3 of the three-way remote control valve are closed, and ports 1 and 3 of the three-way remote control valve are opened, so that the ethylene glycol water in the ethylene glycol large compartment flows into the ethylene glycol water circulation system to restore the ethylene glycol water circulation system to normal operating conditions.

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