Nitrogen testing system for fuel valve of methanol dual-fuel ship

Abstract

The invention discloses a nitrogen testing system for a methanol dual-fuel ship gas valve, and belongs to the technical field of gas detection. The test system comprises a nitrogen supply unit, a nitrogen cut-off valve with a limit, a methanol fuel valve test board, a ventilation fan, an oxygen detector and the like. The system has a working mode, a low-pressure alarm mode and an oxygen alarm mode, in the oxygen alarm mode, when an oxygen detector detects that the oxygen concentration is lower than a set threshold value, it is judged that the nitrogen concentration exceeds the standard, and when the oxygen detector sends out an oxygen concentration low alarm, a chain closing and limiting nitrogen cut-off valve is triggered to cut off nitrogen release; and meanwhile, the ventilation fan is turned on for continuous ventilation. Through interlocking and linkage of a nitrogen stop valve, an oxygen detector, a ventilation fan, a workshop electric control door and the like, a nitrogen release outlet valve is closed at the first time when nitrogen exceeds the standard, an alarm is given, ventilation is started, and suffocation caused by the fact that the nitrogen exceeds the standard is avoided.

Description

TECHNICAL FIELD

[0001] The application relates to a methanol dual-fuel ship fuel valve nitrogen test system and belongs to the technical field of gas detection. BACKGROUND

[0002] With the increasingly stringent global emission restrictions, many ships are equipped with clean fuel systems such as methanol, and the methanol fuel valves of the fuels need to be tested by high-pressure nitrogen, but the existing fuel valve test bench is arranged in a closed space and tested by high-pressure nitrogen, and there is a risk of suffocation in the case of nitrogen leakage, and the safety is low, and needs to be improved. SUMMARY

[0003] To solve the problems in the prior art, the application provides a ship fuel valve nitrogen test system which has obvious advantages in safety and reliability and prevention of suffocation.

[0004] The technical scheme adopted by the application is as follows: a methanol dual-fuel ship fuel valve nitrogen test system, the test system comprises a nitrogen supply unit with low-pressure alarm, a nitrogen cut-off valve with limit, a methanol fuel valve test bench, a ventilation fan, an oxygen detector, a set of oxygen cylinders of a gas welding machine unit, an oxygen release valve and a workroom electric control door.

[0005] The nitrogen supply unit with low-pressure alarm, the nitrogen cut-off valve with limit and the methanol fuel valve test bench form a fuel valve nitrogen test system for fuel valve test; the nitrogen cut-off valve with limit is electrically connected with the ventilation fan and the workroom electric control door; the nitrogen supply unit with low-pressure alarm is electrically connected with the ventilation fan and the workroom electric control door.

[0006] The oxygen detector, the nitrogen cut-off valve with limit, the ventilation fan, the set of oxygen cylinders of the gas welding machine unit, the oxygen release valve and the workroom electric control door form a combined system for preventing nitrogen leakage; the oxygen detector is electrically connected with the ventilation fan, the oxygen release valve and the workroom electric control door.

[0007] The system comprises a test working mode, a low-pressure alarm mode and an oxygen alarm mode.

[0008] Test working mode: when the methanol fuel valve nitrogen test system is normally working, the nitrogen cut-off valve with limit is opened to release nitrogen, and the ventilation fan is opened in linkage, and the workroom electric control door is opened, so that ventilation is continuously ensured when nitrogen is used.

[0009] Low-pressure alarm mode: when the methanol fuel valve nitrogen test system is not working and the nitrogen supply unit with low-pressure alarm detects that the pressure of the nitrogen supply unit decreases, nitrogen low-pressure alarm is triggered, the ventilation fan is opened in linkage, and the workroom electric control door is opened, so that ventilation is continuously ensured when nitrogen leaks.

[0010] Oxygen alarm mode: when the oxygen detector in the working chamber detects that the oxygen concentration is lower than the set threshold, it is determined that the nitrogen concentration is excessive, and the oxygen detector issues an oxygen concentration low alarm:

[0011] a. If the nitrogen cut-off valve with a limit is detected to be in an open state, the interlocking closing of the nitrogen cut-off valve with a limit is triggered to cut off the nitrogen release, maintain the opening of the ventilation fan and the electrically controlled door of the working chamber, and simultaneously open the oxygen release valve of the oxy-fuel welding unit oxygen cylinder group to release oxygen;

[0012] b. If the nitrogen cut-off valve with a limit is detected to be in a closed state, the nitrogen low pressure alarm with a low pressure alarm triggers a nitrogen low pressure alarm, maintains the opening of the ventilation fan and the electrically controlled door of the working chamber, and simultaneously opens the oxygen release valve of the oxy-fuel welding unit oxygen cylinder group to release oxygen;

[0013] c. If the nitrogen cut-off valve with a limit is detected to be in a closed state and the nitrogen low pressure alarm with a low pressure alarm does not trigger a nitrogen low pressure alarm, the oxygen detector opens the ventilation fan and the electrically controlled door of the working chamber, and simultaneously opens the oxygen release valve of the oxy-fuel welding unit oxygen cylinder group to release oxygen;

[0014] Until the oxygen detector detects that the oxygen reaches the normal value in air, the oxygen release valve is closed.

[0015] Compared with the prior art, the present application has the following advantages: through interlocking and linkage of the nitrogen cut-off valve, the oxygen detector, the ventilation fan, etc., the nitrogen release outlet valve is closed in the first time when the nitrogen concentration is excessive, an alarm is issued, and ventilation is started to avoid suffocation caused by excessive nitrogen. The system is designed to test the nitrogen environment of the methanol dual-fuel ship gas valve to ensure the effectiveness of the test. At the same time, through the interlocking control of multiple modes and multiple devices, the prevention, early warning and disposal of nitrogen leakage are covered in a closed loop, intelligent operation is realized, and finally the dual high requirements of equipment test accuracy and operation environment safety in the field of ship maintenance are met. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0017] Figure 1 is a schematic diagram of a methanol dual-fuel ship gas valve nitrogen test system.

[0018] In the figure: 1, nitrogen supply unit, 2, nitrogen cut-off valve with limit, 3, methanol fuel valve test bench, 4, ventilation fan, 5, oxygen detector, 6, set of oxygen cylinders for welding machine unit, 7, oxygen release valve, 8, electrically controlled door of workshop. DETAILED DESCRIPTION

[0019] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the drawings and in combination with the embodiments.

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0021] It should be noted that the terms used herein are only for describing the specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form, unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0022] Unless specifically stated otherwise, the relative arrangement of the components and steps, numerical expressions, and values set forth in the examples are not intended to limit the scope of the present application. At the same time, it should be clear that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportion relationship for the convenience of description. The technology, methods and devices known to those skilled in the relevant art can not be discussed in detail, but in appropriate cases, the technology, methods and devices should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0023] In the description of the application, it needs to be understood that the orientation words such as "front, back, up, down, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the devices or elements referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the scope of protection of the application: the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0024] For the convenience of description, spatial relative terms such as "over", "above", "upper surface", "upper" and the like can be used herein to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the devices described in the drawings. For example, if the devices in the drawings are inverted, the device described as "above" or "over" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0025] In addition, it should be noted that the use of the words "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, and therefore cannot be understood as a limitation on the scope of protection of the application.

[0026] Figure 1 A methanol dual-fuel ship gas valve nitrogen test system is shown, the test system includes a nitrogen supply unit 1 with low pressure alarm, a nitrogen cut-off valve 2 with limit, a methanol fuel valve test bench 3, a ventilation fan 4, an oxygen detector 5, a gas welding machine unit oxygen bottle group 6, an oxygen release valve 7, a workshop electric control door 8;

[0027] The gas valve nitrogen test system includes a nitrogen supply unit 1 with low pressure alarm, a nitrogen cut-off valve 2 with limit, a methanol fuel valve test bench 3, which is used for gas valve test; wherein the nitrogen cut-off valve 2 with limit is electrically connected with the ventilation fan 4 and the workshop electric control door 8, to control the opening and closing of the two. The nitrogen supply unit 1 with low pressure alarm is also electrically connected with the ventilation fan 4 and the workshop electric control door 8, to control the opening and closing of the two.

[0028] The joint system comprises an oxygen detector 5, a nitrogen cut-off valve 2 with a limit, a ventilation fan 4, a gas welding unit oxygen cylinder group 6, an oxygen release valve 7, and a workshop electric control door 8, which are used to prevent nitrogen leakage and regulate the oxygen concentration in the workshop.

[0029] The system comprises a test working mode, a low-pressure alarm mode, and an oxygen alarm mode.

[0030] Test working mode: When the methanol fuel valve nitrogen test system is working normally, nitrogen is introduced into the methanol fuel valve for testing. The nitrogen cut-off valve 2 with a limit is opened to release nitrogen, which will automatically open the ventilation fan 4 and the workshop electric control door 8 to ensure continuous ventilation during the use of nitrogen.

[0031] Low-pressure alarm mode: When the nitrogen supply unit 1 with a low-pressure alarm detects a decrease in the nitrogen supply unit pressure while the methanol fuel valve nitrogen test system is not working, the nitrogen low-pressure alarm will be triggered. After the alarm is issued, the nitrogen supply unit 1 with a low-pressure alarm will control the opening of the ventilation fan 4 and the workshop electric control door 8 to ensure continuous ventilation in the event of nitrogen leakage.

[0032] Oxygen alarm mode: When the oxygen detector 5 in the workshop detects that the oxygen concentration is lower than the set threshold, it is determined that the nitrogen concentration is excessive, and the oxygen detector 5 will issue an oxygen concentration low alarm.

[0033] a. If it is detected that the nitrogen cut-off valve 2 with a limit is in an open state, the interlocking closing of the nitrogen cut-off valve 2 with a limit will be triggered to cut off the release of nitrogen, and the opening of the ventilation fan 4 and the workshop electric control door 8 will be maintained, while the gas welding unit oxygen cylinder group 6 and the oxygen release valve 7 will be opened to release oxygen;

[0034] b. If it is detected that the nitrogen cut-off valve 2 with a limit is in a closed state, the nitrogen low-pressure alarm of the nitrogen supply unit 1 with a low-pressure alarm will be triggered, the opening of the ventilation fan 4 and the workshop electric control door 8 will be maintained, and the gas welding unit oxygen cylinder group 6 and the oxygen release valve 7 will be opened to release oxygen;

[0035] c. If it is detected that the nitrogen cut-off valve 2 with a limit is in a closed state and the nitrogen low-pressure alarm of the nitrogen supply unit 1 with a low-pressure alarm is not triggered, the oxygen detector 5 will open the ventilation fan 4 and the workshop electric control door 8, and the gas welding unit oxygen cylinder group 6 and the oxygen release valve 7 will be opened to release oxygen;

[0036] Until the oxygen detector 5 detects that the oxygen reaches the normal value in the air, the oxygen release valve 7 will be closed.

[0037] The nitrogen supply unit 1, the nitrogen cut-off valve 2 with a limit, and the methanol fuel valve test bench 3 constitute a gas valve nitrogen test system for testing a gas valve; when the methanol fuel valve nitrogen test system is working normally, the nitrogen cut-off valve 2 with a limit is opened to release nitrogen, and a ventilation fan 4 is opened in a cascading manner to ensure continuous ventilation to prevent suffocation when nitrogen is used; when the nitrogen concentration exceeds the standard, an oxygen detector 5 sends a low-oxygen-concentration alarm to trigger a cascading action, the nitrogen cut-off valve 2 with a limit is closed, and the ventilation fan 4 is opened to cut off the release of nitrogen and continuously ventilate to prevent suffocation.

[0038] The system realizes the prevention, early warning, and disposal of nitrogen leakage in a closed loop through cascading control of multiple modes and multiple devices, simultaneously realizes intelligent operation, and finally meets the dual high requirements of precision of equipment testing and safety of an operating environment in the field of ship maintenance.

[0039] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A nitrogen testing system for a methanol dual-fuel ship fuel valve, characterized in that, The testing system includes a nitrogen supply unit (1) with low pressure alarm, a nitrogen shut-off valve (2) with limit switch, a methanol fuel valve test bench (3), a ventilation fan (4), an oxygen detector (5), an oxygen cylinder group for the gas welding machine unit (6), an oxygen release valve (7), and an electrically controlled door for the work area (8). A nitrogen supply unit (1) with low-pressure alarm, a nitrogen shut-off valve (2) with limit switch, and a methanol fuel valve test bench (3) constitute a gas valve nitrogen test system for gas valve testing; the nitrogen shut-off valve (2) with limit switch is electrically connected to the ventilation fan (4) and the workshop electric control door (8); the nitrogen supply unit (1) with low-pressure alarm is electrically connected to the ventilation fan (4) and the workshop electric control door (8); The oxygen detector (5), nitrogen shut-off valve (2) with limit switch, ventilation fan (4), oxygen cylinder group of gas welding machine unit (6), oxygen release valve (7), and workshop electric control door (8) form a joint system to prevent nitrogen leakage; the oxygen detector (5) is electrically connected to the ventilation fan (4), oxygen release valve (7), and workshop electric control door (8). The system includes a test working mode, a low-pressure alarm mode, and an oxygen alarm mode; Test working mode: When the methanol fuel valve nitrogen test system is working normally, the nitrogen shut-off valve (2) with limit switch opens to release nitrogen, and the ventilation fan (4) and the electrical control door of the work room (8) are opened in an interlock to ensure continuous ventilation when nitrogen is used; Low pressure alarm mode: The nitrogen supply unit (1) with low pressure alarm detects a drop in nitrogen supply unit pressure when the nitrogen test system of methanol fuel valve is not working and triggers nitrogen low pressure alarm. The ventilation fan (4) and the electrical control door of the workshop (8) are opened in a chain to ensure continuous ventilation when nitrogen leaks. Oxygen alarm mode: When the oxygen detector (5) in the work area detects that the oxygen concentration is lower than the set threshold, it determines that the nitrogen concentration exceeds the standard, and the oxygen detector (5) issues a low oxygen concentration alarm: a. If the nitrogen shut-off valve (2) with limit is detected to be in the open state, the nitrogen shut-off valve (2) with limit is triggered to close the interlock and cut off the nitrogen release, maintaining the opening of the ventilation fan (4) and the electrical control door (8) of the workshop. At the same time, the oxygen cylinder group (6) of the gas welding machine unit releases oxygen by opening the oxygen release valve (7). b. If the nitrogen shut-off valve (2) with limit is detected to be closed, the nitrogen supply unit (1) with low pressure alarm will trigger the nitrogen low pressure alarm, maintain the opening of the ventilation fan (4) and the electrical control door (8) of the workshop, and at the same time, the oxygen cylinder group (6) of the gas welding machine unit will release oxygen by opening the oxygen release valve (7). c. If the nitrogen shut-off valve (2) with limit is detected to be closed and the nitrogen supply unit (1) with low pressure alarm does not trigger the nitrogen low pressure alarm, then the oxygen detector (5) turns on the ventilation fan (4) and the electrical control door (8) of the workshop, and at the same time the oxygen cylinder group (6) of the gas welding machine unit releases oxygen by opening the oxygen release valve (7). The oxygen release valve (7) closes once the oxygen detector (5) detects that the oxygen level in the air has reached the normal value.

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