LNG ship combustible gas detection system and ship

Abstract

The embodiment of the utility model provides an LNG ship combustible gas detection system and a ship. According to the combustible gas detection system for the LNG ship, a corresponding cabin area sampling unit and a cargo hold area sampling unit are designed according to the characteristics of a cabin and a cargo hold of the LNG ship, so that the installation environment of the cabin and the cargo hold is overcome, and combustible gas detection of the LNG cabin and the cargo hold can be realized.

Description

Technical Field

[0001] The present application relates to the technical field of LNG ship safety, and in particular to a LNG ship combustible gas detection system and a ship. Background Art

[0002] Green ship propulsion with the goal of reducing greenhouse gas emissions has become a hot topic in the shipping industry in recent years. At present, my country's shipping industry is actively exploring a low-carbon development path guided by the 2030 carbon peak target and the 2060 carbon neutrality vision. The annual demand for liquefied natural gas (LNG) fuel in China and the global shipping industry is increasing, and the supporting demand for liquid cargo systems of large LNG carriers is also increasing.

[0003] There are clear regulations and restrictions on combustible gas detection in the International Maritime Organization-International Convention for the Safety of Life at Sea (i.e. SOLAS Convention) and the "Rules for Classification of Seagoing Steel Ships". In addition, the "International Code of Safety for Ships Powered by Gases or Other Low Flashpoint Fuels" (IGF Code), the "International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk" (IGC Code), and the "Rules for the Use of Natural Gas Fuel in Ships" have put forward clear requirements for ships using or transporting natural gas, including the location / space for setting up gas detection systems, visual and auditory alarms, functional design and installation requirements, etc. In order to closely monitor the concentration of liquid cargo steam or combustible gas in ships and ensure the safe navigation of ships, gas detection systems are indispensable monitoring and alarm equipment. Utility Model Content

[0004] The purpose of this application is to provide a combustible gas detection system for LNG ships.

[0005] In a first aspect, an embodiment of the present application provides a LNG ship combustible gas detection system, the system comprising: a system control unit, a cargo tank sampling unit, and a gas detector;

[0006] The system control unit is in communication connection with the gas detector, and the system control unit is capable of sending gas detection instruction information to the gas detector;

[0007] The gas detector is arranged in the engine room area, and can be used to detect the gas concentration after receiving the gas detection instruction information sent by the system control unit, and send the detection result to the system control unit;

[0008] The cargo hold sampling unit includes a cargo hold area sampling box and a cargo hold area sampling valve group, each sampling valve of the cargo hold area sampling valve group is controlled by a corresponding solenoid valve, the cargo hold area sampling box is communicatively connected with the system control unit, the cargo hold area sampling box is connected to the cargo hold area sampling valve group through a sampling pipe, a first sampling pump and a first gas detector are arranged in the cargo hold area sampling, the first gas detector is connected to each sampling valve of the cargo hold area sampling valve group through a sampling pipe, the cargo hold area sampling box can control the solenoid valve switch corresponding to each sampling valve, and drive the sampling valve of the cargo hold area sampling valve group to sample gas into the cargo hold area sampling box through the first sampling pump for detection by the first gas detector.

[0009] In some embodiments, the system further comprises: a cabin sampling unit;

[0010] The cabin sampling unit includes a cabin area sampling box and a cabin area sampling valve group, the cabin area sampling box is communicatively connected to the system control unit, the cabin area sampling box is connected to the cabin area sampling valve group via a sampling pipe, a second sampling pump and a second gas detector are arranged in the cabin area sampling box, the second gas detector is correspondingly connected to the sampling valve of the cabin area sampling valve group via the sampling pipe, and the second sampling pump can drive the sampling valve of the cabin area sampling valve group to sample gas into the cabin area sampling box for detection by the second gas detector.

[0011] In some embodiments, the number of the first gas detectors is four.

[0012] In some embodiments, the cargo hold area sampling valve group includes a two-way sampling valve group, one main and one backup.

[0013] In some embodiments, the sampling positions of the cargo area sampling valve group include an insulating layer space, a liquid dome and a channel.

[0014] In some embodiments, the system control unit includes a programmable logic controller (PLC) module and peripheral circuits, and the PLC module includes: a CPU module, an analog input module, a digital input module, and a digital output module.

[0015] In some embodiments, the system control unit is communicatively connected with the gas detector, including: the system control unit is connected with the gas detector by wire.

[0016] In some embodiments, the cabin area sampling box is communicatively connected to the system control unit, including: the cabin area sampling box is connected to the system control unit by wire or wirelessly.

[0017] In some embodiments, the cargo hold area sampling box is communicatively connected to the system control unit, including: the cargo hold area sampling box is connected to the system control unit by wire or wirelessly.

[0018] In a second aspect, an embodiment of the present application provides an LNG ship, comprising a LNG ship combustible gas detection system as described in any embodiment of the first aspect.

[0019] The above-mentioned embodiments of the present application, by designing a LNG ship combustible gas detection system, design corresponding cabin area sampling units and cargo hold area sampling units according to the characteristics of the engine room and cargo hold of the LNG ship, so as to overcome the installation environment of the engine room and cargo hold, and realize the combustible gas detection of the LNG engine room and cargo hold. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings illustrate generally, by way of example and not limitation, various embodiments discussed herein.

[0021] Figure 1 This is the overall architecture diagram of the combustible gas detection system;

[0022] Figure 2 PLC configuration for combustible gas detection system;

[0023] Figure 3 Configure the flammable gas detection system communication;

[0024] Figure 4 Configure the IO configuration for the combustible gas detection system;

[0025] Figure 5 AI sampling circuit diagram for combustible gas detection system;

[0026] Figure 6 This is the P-ID diagram of the sampling box in the cabin area;

[0027] Figure 7 This is a block diagram of the cargo hold area sampling unit architecture;

[0028] Figure 8 This is the cargo hold area sampling unit P-ID diagram;

[0029] Fig. 9 This is the circuit diagram of the power cut-off box. DETAILED DESCRIPTION

[0030] In order to enable a more detailed understanding of the features and technical contents of the embodiments of the present application, the implementation of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present application.

[0031] In the embodiments of the present application, it should be noted that, unless otherwise specified and limited, the term "connection" should be understood in a broad sense. For example, it can be an electrical connection or a connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0032] It should be noted that the terms "first\second\third" involved in the embodiments of the present application are only used to distinguish similar objects, and do not represent a specific order for the objects. It is understandable that the specific order or sequence of "first\second\third" can be interchanged where permitted. It should be understood that the objects distinguished by "first\second\third" can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0033] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0034] An embodiment of the present application provides a flammable gas detection system for an LNG ship, the system comprising: a system control unit, a cargo hold sampling unit, and a gas detector.

[0035] The system control unit is communicatively connected with the gas detector, and the system control unit can send gas detection instruction information to the gas detector.

[0036] In some embodiments, the system control unit is connected to the gas detector by wire, and the system control unit can send gas detection instruction information to the gas detector and receive a 4-20mA analog signal sent by the gas detector.

[0037] The gas detector is arranged in the engine room area, and can be used to detect the gas concentration after receiving the gas detection instruction information sent by the system control unit, and send the detection result to the system control unit.

[0038] The cargo hold sampling unit includes a cargo hold area sampling box and a cargo hold area sampling valve group. Each sampling valve of the cargo hold area sampling valve group is controlled by a corresponding solenoid valve. The cargo hold area sampling box is communicatively connected with the system control unit. The cargo hold area sampling box is connected to the cargo hold area sampling valve group through a sampling tube. A first sampling pump and a first gas detector are arranged in the cargo hold area sampling. The first gas detector is connected to each sampling valve of the cargo hold area sampling valve group through a sampling tube. The cargo hold area sampling box can control the solenoid valve switch corresponding to each sampling valve, and drive the sampling valve of the cargo hold area sampling valve group to sample gas into the cargo hold area sampling box through the first sampling pump for detection by the first gas detector.

[0039] In some embodiments, the system further comprises: a cabin sampling unit.

[0040] The cabin sampling unit includes a cabin area sampling box and a cabin area sampling valve group. The cabin area sampling box is communicatively connected to the system control unit. The cabin area sampling box is connected to the cabin area sampling valve group through a sampling tube. A second sampling pump and a second gas detector are arranged in the cabin area sampling box. The second gas detector is correspondingly connected to the sampling valve of the cabin area sampling valve group through the sampling tube. The second sampling pump can drive the sampling valve of the cabin area sampling valve group to sample gas into the cabin area sampling box for detection by the second gas detector.

[0041] In some embodiments, the number of the first gas detectors is four.

[0042] In some embodiments, the cargo hold area sampling valve group includes a two-way sampling valve group, one main and one backup.

[0043] In some embodiments, the sampling locations of the cargo area sampling valve group include the insulation layer space, the liquid dome and the channel.

[0044] In some embodiments, the system control unit includes a programmable logic controller (PLC) module and peripheral circuits, and the PLC module includes: a CPU module, an analog input module, a digital input module, and a digital output module.

[0045] In some embodiments, the system control unit is communicatively connected to the gas detector, including: the system control unit is connected to the gas detector by wire.

[0046] In some embodiments, the cabin area sampling box is communicatively connected to the system control unit, including: the cabin area sampling box is connected to the system control unit by wire or wirelessly.

[0047] In some embodiments, the cargo hold area sampling box is communicatively connected to the system control unit, including: the cargo hold area sampling box is connected to the system control unit by wire or wirelessly.

[0048] An embodiment of the present application provides an LNG ship, comprising a LNG ship combustible gas detection system as described in any of the above embodiments.

[0049] In order to elaborate on the design features of the combustible gas detection system, the gas detector is further explained below in conjunction with the accompanying drawings.

[0050] The overall structure diagram of the combustible gas detection system is as follows: Figure 1 As shown in the figure, the main control box of the combustible gas detection system mainly collects signals from the cabin area sampling unit and the cargo hold area sampling unit. The cabin sampling unit consists of the cabin area sampling box and gas detectors arranged in various places in the cabin. It is mainly used to detect the gas concentration in the necessary positions in the cabin (mainly the emergency cut-off protection place) and some other areas (such as ventilation places, air locks, etc.). The cargo hold sampling unit is mainly composed of the cargo hold area sampling box and the external sampling pipeline, and is mainly used for sampling in dangerous areas such as liquid cargo tanks.

[0051] The PLC configuration of the combustible gas detection system is as follows: Figure 2 As shown in the figure, the controller module of the control unit is mainly composed of a programmable logic controller (PLC) and peripheral circuits. The PLC module includes: CPU module, analog input module, digital input module, and digital output module. The most important feature of the gas detection device system is: a large number of points, especially a large number of analog acquisition points. Therefore, the PLC module is configured by the CPU and IO expansion module.

[0052] The flammable gas detection system communication configuration is as follows: Figure 3 As shown in the figure, the system control unit needs to communicate with the peripheral centralized monitoring alarm system (IAS) as a slave through the Modbus RTU protocol, and the control box also needs to communicate with the remote touch screen. In this design, three communication modules are extended on the left side of the CPU, and the communication requirements can be met through software configuration.

[0053] The IO configuration of the combustible gas detection system is as follows: Figure 4 As shown in the figure, the IO module configuration of the system control unit includes: 11 analog input modules, 1 digital input module, 4 digital output modules. On the basis of 1215CPU, 88 AI input points, 16 DI input points and 64 DO output points can be additionally expanded, which meets the hardware requirements of the gas detection system control unit of LNG carriers. At the same time, the total width of the module is only 297mm, which can also be easily installed horizontally on the rail in the control box.

[0054] The AI ​​sampling circuit diagram of the combustible gas detection system is as attached. Figure 5 shown.

[0055] Cabin area sampling box P-ID diagram is attached Figure 6As shown, the gas in the measured place enters the sampling box through the flame arrester 1 and the oil-water separator 3 to prevent the spread of flame caused by crankcase gas leakage. A manual three-way valve 2 is installed in the sampling box, and the measured gas is sampled by the sampling pump 4, passes through the flow switch 5, and then passes through the gas detector 6, and then is released to the outside of the sampling box. The sampling box is arranged in a safe area, and an independent combustible gas detector is installed inside the box to detect whether there is a leak in the pipeline inside the box. The sampling unit in the cabin area adopts a modular design. Each sampling box can be built-in with 2, 4 or 6 sampling pipelines according to actual needs, with attached Figure 6 The figure shows two sampling lines, each of which can be used independently for sampling and monitoring: main engine high and low temperature fresh water expansion tanks, glycol water expansion tanks, main and auxiliary engine crankcases, etc. Multiple different sampling boxes can be used together in the same gas detection system. For example, when the two areas to be tested are far apart or it is inconvenient to lay pipes, two or more can be used at the same time.

[0056] The cargo hold area sampling unit architecture diagram and P-ID diagram are as follows: Figure 7 and attached Figure 8 As shown, the cargo hold sampling unit is composed of a cargo hold area sampling box and an external sampling pipeline 8, and is mainly used for sampling point detection in dangerous areas such as cargo holds. The cargo hold area sampling box is composed of 4 gas detectors 9, a two-way sampling valve group with one backup and one use, and a sampling pump 11. The sampling pipeline 8 samples the gas in the insulating layer space, liquid dome, channel and other areas, and samples it into the sampling box through the sampling pump 11 built into the sampling box. The sampling box detects each detection point in turn. The cargo hold area sampling box unit is also equipped with an oil-water separator, a flame arrester, and an independent combustible gas detector to detect internal leakage of the sampling box. The sampling circuit includes a sampling pump 11 and a gas detector 9, one for backup and one for use, that is, the sampling box should include at least 2 sampling pumps and 4 gas detectors. The sampling circuit has a purge function. When the detection system stops or resets, compressed air purges the internal pipelines and sampling pipelines of the box through the purge valve 13 to achieve purge protection. The gas detection system has a redundant design and a wide range design. It uses two range detectors, 0-100% LEL and 0-100% VOL, and both detectors are used as a backup. The calibration of the gas detector can be achieved by opening the calibration valve 14 and introducing standard gas. A gas detector is installed in the internal space of the cargo hold sampling box to detect gas leakage in the box. When a leak occurs, the cargo hold sampling box needs to be manually purged. There is a manual air inlet valve 18 on the wall of the cargo hold sampling box. When the valve is opened, external compressed air enters the box for purging, and is discharged to the open space from the gas discharge valve 17 through the vacuum tube 16. Since the cargo hold sampling box is cut off from power at this time, a portable gas detector can be connected to the detection valve 19 to detect whether there is no high gas concentration alarm inside the box.

[0057] The circuit diagram of the power cut-off box is attached. Fig. 9As shown. The function of the power cut-off box is to supply power or cut off the power to the cargo hold sampling box through the main control unit. When the concentration is detected to be greater than 30% LEL, the gas detection system can automatically cut off the power supply of the control box, and it must be manually powered on again. At this time, the cargo hold sampling box is in a power-off state, isolating the risk of explosion.

[0058] The technical solutions described in the embodiments of the present application can be combined arbitrarily without conflict.

[0059] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A LNG ship combustible gas detection system, characterized in that: The system comprises: a system control unit, a cargo compartment sampling unit and a gas detector; The system control unit is in communication connection with the gas detector, and the system control unit is capable of sending gas detection instruction information to the gas detector; The gas detector is arranged in the engine room area, and can be used to detect the gas concentration after receiving the gas detection instruction information sent by the system control unit, and send the detection result to the system control unit; The cargo hold sampling unit includes a cargo hold area sampling box and a cargo hold area sampling valve group, each sampling valve of the cargo hold area sampling valve group is controlled by a corresponding solenoid valve, the cargo hold area sampling box is communicatively connected with the system control unit, the cargo hold area sampling box is connected to the cargo hold area sampling valve group through a sampling pipe, a first sampling pump and a first gas detector are arranged in the cargo hold area sampling, the first gas detector is connected to each sampling valve of the cargo hold area sampling valve group through a sampling pipe, the cargo hold area sampling box can control the solenoid valve switch corresponding to each sampling valve, and drive the sampling valve of the cargo hold area sampling valve group to sample gas into the cargo hold area sampling box through the first sampling pump for detection by the first gas detector.

2. The LNG ship combustible gas detection system according to claim 1 is characterized in that: The system further comprises: a cabin sampling unit; The cabin sampling unit includes a cabin area sampling box and a cabin area sampling valve group, the cabin area sampling box is communicatively connected to the system control unit, the cabin area sampling box is connected to the cabin area sampling valve group via a sampling pipe, a second sampling pump and a second gas detector are arranged in the cabin area sampling box, the second gas detector is correspondingly connected to the sampling valve of the cabin area sampling valve group via the sampling pipe, and the second sampling pump can drive the sampling valve of the cabin area sampling valve group to sample gas into the cabin area sampling box for detection by the second gas detector.

3. The LNG ship combustible gas detection system according to claim 1 is characterized in that: The number of the first gas detectors is four.

4. The LNG ship combustible gas detection system according to claim 1, characterized in that: The cargo hold area sampling valve group includes a two-way sampling valve group, one main and one backup.

5. The LNG ship combustible gas detection system according to claim 1, characterized in that: The sampling positions of the cargo hold area sampling valve group include the insulation layer space, the liquid dome and the channel.

6. The LNG ship combustible gas detection system according to claim 1, characterized in that: The system control unit includes a programmable logic controller (PLC) module and peripheral circuits. The PLC module includes a CPU module, an analog input module, a digital input module and a digital output module.

7. The LNG ship combustible gas detection system according to claim 1, characterized in that: The system control unit is communicatively connected with the gas detector, including: the system control unit is connected with the gas detector by wire.

8. The LNG ship combustible gas detection system according to claim 2 is characterized in that: The cabin area sampling box is communicatively connected with the system control unit, including: the cabin area sampling box is connected with the system control unit by wire or wirelessly.

9. The LNG ship combustible gas detection system according to claim 1, characterized in that: The cargo hold area sampling box is communicatively connected with the system control unit, including: the cargo hold area sampling box is connected with the system control unit by wire or wirelessly.

10. An LNG ship, characterized in that: It comprises the LNG ship combustible gas detection system as described in any one of claims 1 to 9.

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