Gas leakage detection system of marine dual-fuel main engine

Abstract

A fuel gas leakage detection system of a marine dual-fuel main engine comprises a cylinder body which is connected with an external interface of the main engine through a throttling hole plug, a filter, an oil separator and a fuel gas detector in sequence, and is characterized in that the fuel gas leakage detection system further comprises a pressure transmitter; and the pressure transmitter is connected between the throttling hole plug and the filter and is used for recording the flowing condition of the gas in real time so as to monitor the leakage condition of the gas in real time and serve as a basis for troubleshooting. The pressure transmitter is additionally arranged in front of the fuel gas detector, the fuel gas flowing condition can be recorded in real time, the fuel gas leakage condition can be monitored in real time, meanwhile, the recording of the fuel gas leakage condition facilitates follow-up troubleshooting of fault problems, the dual-fuel main engine has the advantages of being complete in function and convenient to operate, normal operation of the dual-fuel main engine is guaranteed, and the working efficiency of the dual-fuel main engine is improved. The gas leakage monitoring and recording system is more perfect and comprehensive.

Description

Technical Field

[0001] The invention relates to a fuel gas system of a dual-fuel marine diesel engine, in particular to a fuel gas leakage detection system of a marine dual-fuel main engine, belonging to the technical field of diesel engines. Background Art

[0002] In order to cope with the current severe environmental pollution problem, the International Maritime Organization has continuously raised its overall requirements for green, energy-saving and environmentally friendly ships. Traditional diesel engines need to be equipped with exhaust gas treatment equipment to meet emission standards. Today, the development trend of marine main engines is moving towards low emissions, high efficiency and green environmental protection.

[0003] The marine dual-fuel main engine can achieve the conversion of ship power by switching the supply of two fuels in different situations. Compared with the traditional marine diesel engine, a new gas supply system has been added. The operation of this type of main engine in gas mode can directly meet the emission control requirements of the NECA area and the SECA area.

[0004] The dual-fuel host can switch between gas and oil according to environmental requirements. With the use of gas, a comprehensive gas monitoring system needs to be set up. The monitoring system will perform an air tightness test every time the gas is switched, but there may be a small amount of gas leakage during operation.

[0005] Existing gas monitoring systems such as Figure 1 As shown: when using natural gas as the main fuel, the GAV valve is controlled to open, and the natural gas enters the cylinder body 1 for combustion. A part of the natural gas and other combustion gases enter the filter 4 from the cylinder body 1 through the throttle plug 2, and after filtration, they enter the gas detector 5 through the oil separator 3, and finally are discharged outside the main engine through the external interface 7.

[0006] However, this gas monitoring system has the following defects: when gas is used as the main fuel, the gas flow rate cannot be monitored at any time, and the maintenance work cannot find out the problem in time; when oil is used as the main fuel, if there is a small amount of gas leakage, the gas detector 5 cannot detect it in time. Therefore, it is necessary to improve the existing gas monitoring system to make the monitoring range of the gas monitoring system more comprehensive. Summary of the invention

[0007] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a gas leakage detection system for a marine dual-fuel main engine. A pressure transmitter is added in front of the gas monitor to monitor the gas leakage in real time. When the dual-fuel main engine switches to the main fuel, the gas situation can be recorded in time, and an alarm can be issued in time when the gas leaks. In addition, the record of the gas emission situation can facilitate subsequent troubleshooting of the problem.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A gas leak detection system for a marine dual-fuel main engine comprises a cylinder body, which is connected to an external interface of the main engine through a throttle plug, a filter, an oil separator and a gas detector in sequence, and is characterized in that: the gas leak detection system also comprises a pressure transmitter, which is connected between the throttle plug and the filter, and records the gas flow in real time, so as to monitor the gas leakage in real time and serve as a basis for troubleshooting.

[0010] Compared with the prior art, the present invention adds a pressure transmitter before the gas detector, which can record the gas flow in real time and achieve the following beneficial effects:

[0011] 1) Optimized functions: When the marine dual-fuel main engine is switching fuel, the gas monitoring system can realize real-time monitoring of gas leakage and can promptly alarm once a gas leakage occurs.

[0012] 2) It facilitates maintenance and repair - fault troubleshooting can be carried out based on the records of gas leakage, which facilitates subsequent troubleshooting of the problem.

[0013] 3) Realizing safe monitoring of fuel system operation - The present invention realizes real-time and comprehensive monitoring of the dual-fuel supply system, ensuring the normal operation of the dual-fuel main engine.

[0014] In short, the present invention has the advantages of complete functions and convenient operation, and is a more complete and comprehensive gas leakage monitoring and recording system. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of an existing gas leakage monitoring system.

[0016] Figure 2 It is a schematic diagram of the present invention.

[0017] In the figure, 1 is the cylinder body, 2 is the throttle plug, 3 is the oil separator, 4 is the filter, 5 is the gas detector, 6 is the pressure transmitter, and 7 is the external interface. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings in order to more clearly understand the structure of the present invention, but this is not intended to limit the protection scope of the present invention.

[0019] The invention is used for detecting gas leakage of a marine dual-fuel main engine.

[0020] See also Figure 2The gas leakage detection system includes a cylinder body 1, a throttle plug 2, an oil separator 3, a filter 4, a gas detector 5 and a pressure transmitter 6. The cylinder body 1 is connected to an external interface 7 of the host through the throttle plug 2, the filter 4, the oil separator 3 and the gas detector 5 in sequence. The pressure transmitter is connected between the throttle plug 2 and the filter 4 to record the gas flow in real time, so as to monitor the gas leakage in real time and serve as a basis for troubleshooting.

[0021] The specific working principle of the present invention is as follows:

[0022] See also Figure 2 , when the marine dual-fuel main engine is in operation, the fuel can be switched according to demand. When using gas as the main fuel, the GAV valve control is opened, and the gas enters the cylinder body 1 for combustion. A part of the gas and other combustion gases pass through the cylinder body 1 and then through the throttle plug 2, and then through the filter 4 to filter the small molecular particles in the gas, and then through the oil separator 3 to separate the oil, water and gas, and then enter the gas detector 5, and finally through the external interface 7 to the outside of the main engine; the pressure transmitter 6 set before the filter can quickly monitor the flow of gas, and record the flow of gas at any time. When the gas flow is abnormal, an alarm is issued to reduce the occurrence of danger. When using fuel oil as the main fuel, under normal circumstances, there is no natural gas flowing through the gas monitoring system; when the main engine is running, the pressure transmitter 6 records the internal situation of the main engine in real time, monitors whether there is a small amount of natural gas leakage, and if there is a gas outflow through the pipeline, the pressure transmitter will alarm and remind the operator to find and repair it in time.

[0023] The above are only preferred embodiments of the present invention. It must be pointed out that all equivalent modifications, changes and amendments made by technicians in the relevant field according to the content of the application of the present invention should fall within the scope of protection required by the present invention.

Claims

1. A gas leak detection system for a dual-fuel marine main engine, comprising a cylinder body, which is connected to an external interface of the main engine via a throttle plug, a filter, an oil separator and a gas detector in sequence, and is characterized in that: The gas leakage detection system also includes a pressure transmitter, which is connected between the throttle plug and the filter to record the gas flow in real time, so as to monitor the gas leakage in real time and serve as a basis for troubleshooting.

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