Gas fuel conveying monitoring system and overhauling method

Abstract

The invention relates to the technical field of gas fuel power, and discloses a gas fuel conveying monitoring system and a maintenance method. The periphery of the second pipe body is sleeved with the first pipe body, and gas fuel is introduced into the second pipe body; the first pressure sensor is connected with the first pipe body; the second pressure sensor is connected with the second pipe body; the combustible gas detector is arranged between the first pipe body and the second pipe body; the control assembly is electrically connected with the first pressure sensor and the second pressure sensor; the air pressure between the first pipe body and the second pipe body is larger than the air pressure in the second pipe body. According to the gas fuel conveying monitoring system, inert gas is introduced between the first pipe body and the second pipe body, even if gas leakage occurs in the inner pipe, gas cannot rapidly escape from the damaged position of the inner pipe, and after leakage is monitored, maintenance intervention can be conducted in time, and safety is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of gas fuel power technology, and in particular to a gas fuel delivery monitoring system and a maintenance method. Background Art

[0002] LNG ships have adopted dual-fuel technology to power medium-speed generators and low-speed diesel engines, and they generally use double-walled pipe systems to transport gas.

[0003] In the prior art, in the system, the gas mainly flows in the inner tube, while the fresh air from the outside circulates in the gap between the outer tube and the inner tube of the double-walled tube to ensure smooth air circulation. If the gas in the inner tube accidentally leaks, the leaked gas will be directly discharged into this annular area without penetrating into the cabin. This design significantly enhances the safety of the cabin.

[0004] Obviously, if a gas leak occurs, although it will not be discharged into the cabin, the mixture of gas and air in the outer pipe can easily form an explosion source, posing a great safety hazard. Summary of the invention

[0005] The purpose of the present invention is to provide a gas fuel transportation monitoring system, in which an inert gas is introduced between a first tube body and a second tube body, and the air pressure between the first tube body and the second tube body is kept greater than the air pressure inside the second tube body. Even if a gas leak occurs in the second tube body, due to the pressure difference, the gas will not escape quickly from the damaged part of the second tube body, but will only slowly diffuse into the first tube body. After the leak is detected, the staff can perform maintenance intervention in time to ensure safety.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A first aspect of the present invention provides a gas fuel delivery monitoring system, comprising:

[0008] A GVU valve group, wherein the GVU valve group has a first gas channel and a second gas channel, wherein the first gas channel is sleeved on the outer periphery of the second gas channel, and the first gas channel and the second gas channel are not connected to each other;

[0009] a first tube body, the first tube body being connected to the first gas channel, and an inert gas flowing inside the first tube body;

[0010] a second tube body, the second tube body being connected to the second gas channel, the first tube body being sleeved on the outer circumference of the second tube body, and gas fuel being passed through the interior of the second tube body;

[0011] a first pressure sensor, wherein the first pressure sensor is connected to the first tube body;

[0012] a second pressure sensor, wherein the second pressure sensor is connected to the second tube body;

[0013] A combustible gas detector, wherein the combustible gas detector is arranged between the first tube body and the second tube body;

[0014] a control component, the control component being electrically connected to the first pressure sensor and the second pressure sensor;

[0015] Wherein, the air pressure between the first tube body and the second tube body is greater than the air pressure inside the second tube body.

[0016] Furthermore, the gas fuel delivery monitoring system also includes a first valve, one end of which is connected to the first tube body and the other end is connected to external air; a second valve, one end of which is connected to the first tube body and the other end is connected to an inert gas source.

[0017] Furthermore, the gas fuel delivery monitoring system also includes an audible and visual alarm and a status indicator, and the control component is electrically connected to the first valve, the second valve, the audible and visual alarm, and the status indicator.

[0018] Furthermore, the status indicator has:

[0019] State 1: The system works normally;

[0020] State 2: System abnormality, abnormal pressure occurs in the first tube;

[0021] State 3: The system fails and the first tube is damaged;

[0022] State 4: The system fails and the second tube is damaged.

[0023] Furthermore, the control component is configured to:

[0024] The preset pressure in the second tube is denoted as P 1 , the value of the second pressure sensor is recorded as P 2 , the minimum working pressure in the first tube is recorded as P 3 , the value of the first pressure sensor is recorded as P 4 ;

[0025] When the system is working normally, P 4 ≥P 3 , P 1 ≈P 2 At this time, the first valve and the second valve are both in a closed state, and the state indicator displays the state 1;

[0026] When the system works for a long time, P 4 A decrease may occur until P 4 <P 3 , the state indicator shows the state 2, at this time, the second valve is opened until P 4 ≥P 3 , the second valve is closed, and the status indicator displays the state 1;

[0027] When the first tube is damaged, P 4 Rapidly decreases, at this time, the first valve and the second valve are both closed, P 4 Reduce to P 4 =P 2 After that, P 4 When the pressure continues to decrease to atmospheric pressure, the state indicator displays the state three, and the sound and light alarm flashes and sounds an alarm;

[0028] When the second tube is damaged, P 4 Rapidly decreases, at this time, the first valve and the second valve are both closed, and the combustible gas detector detects gas fuel leakage, P 4 Reduce to P 4 =P 2 After that, it remains unchanged, the status indicator displays the status four, and the sound and light alarm flashes and sounds an alarm.

[0029] The second aspect of the present invention provides a maintenance method based on the above-mentioned gas fuel delivery monitoring system:

[0030] When the GVU valve group needs to be repaired, the control component controls the first valve to open and the second valve to close until P 4 Equal to atmospheric pressure, at this time, the GVU valve body can be opened for maintenance;

[0031] When the GVU valve group is overhauled, the GVU valve group is closed, and the control component controls the first valve body to close and the second valve body to open until P 4 ≥P 3 , the status indicator displays the status one, and the gas fuel delivery monitoring system can resume normal operation.

[0032] Compared with the prior art, the gas fuel transportation monitoring system and maintenance method of the embodiment of the present invention has the following beneficial effects: an inert gas is introduced between the first tube body and the second tube body, and the air pressure between the first tube body and the second tube body is kept greater than the air pressure inside the second tube body. Even if a gas leak occurs in the second tube body, due to the pressure difference, the gas will not escape quickly from the damaged part of the second tube body, but will only slowly diffuse into the first tube body. After the combustible gas detector detects a leak, the staff can perform maintenance intervention in time to ensure safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a schematic diagram of the structure of a gas fuel delivery monitoring system according to an embodiment of the present invention;

[0034] Figure 2 is a schematic diagram of the effect of the indicator of the gas fuel delivery monitoring system according to an embodiment of the present invention;

[0035] In the figure, 1. GVU valve group;

[0036] 2. The first tube body;

[0037] 3. The second tube body;

[0038] 4. A first pressure sensor;

[0039] 5. A second pressure sensor;

[0040] 6. Combustible gas detector;

[0041] 7. Control components;

[0042] 8. First valve;

[0043] 9. Second valve;

[0044] 10. Sound and light alarm;

[0045] 11. Status indicator. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "inner", "outer", "lateral", "longitudinal" and the like used to indicate the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only used to facilitate the description of the present invention and simplify the description, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. For those of ordinary skill in the art, the specific meanings of these terms in the present invention can be understood according to specific circumstances.

[0048] In the description of the present invention, the terms "provided with", "set", "connected", and "placed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0050] The technical solution of the present invention is further described below in conjunction with embodiments and drawings.

[0051] A first aspect of the present invention provides a gas fuel delivery monitoring system, such as Figure 1 As shown, including:

[0052] GVU valve group 1, GVU valve group 1 has a first gas channel and a second gas channel, the first gas channel is sleeved on the periphery of the second gas channel, and the first gas channel and the second gas channel are not connected to each other;

[0053] A first tube body 2, the first tube body 2 is connected to the first gas channel, and an inert gas flows inside the first tube body 2;

[0054] The second tube body 3 is connected with the second gas channel, the first tube body 2 is sleeved on the outer periphery of the second tube body 3, and the gas fuel is passed through the interior of the second tube body 3;

[0055] A first pressure sensor 4, the first pressure sensor 4 is connected to the first tube body 2;

[0056] A second pressure sensor 5, the second pressure sensor 5 is connected to the second tube body 3;

[0057] A combustible gas detector 6, which is disposed between the first tube body 2 and the second tube body 3;

[0058] A control component 7, the control component 7 is electrically connected to the first pressure sensor 4 and the second pressure sensor 5;

[0059] The air pressure between the first tube body 2 and the second tube body 3 is greater than the air pressure in the second tube body 3 .

[0060] Based on the above technical solution, an inert gas is introduced between the first tube body 2 and the second tube body 3, and the air pressure between the first tube body 2 and the second tube body 3 is kept greater than the air pressure in the second tube body 3. Even if a gas leak occurs in the second tube body 3, due to the pressure difference, the gas will not escape quickly from the damaged part of the second tube body 3, but will only slowly diffuse into the first tube body 2. After the combustible gas detector 6 detects the leak, the staff can perform maintenance intervention in time to ensure safety.

[0061] Preferably, the gas fuel delivery monitoring system further includes a first valve 8, one end of which is connected to the first tube body 2, and the other end is connected to the external air; a second valve 9, one end of which is connected to the first tube body 2, and the other end is connected to the inert gas source. The gas pressure of the inert gas can be adjusted in time according to the pressure value of the first pressure sensor 4 to avoid the situation of excessive pressure or insufficient pressure. If the pressure is too high, when the second tube body 3 is damaged, the inert gas is easily pressed into the second tube body 3, resulting in an increase in the gas delivery speed in the second tube body 3, and the inert gas burns together with the gas fuel. Incomplete combustion is likely to produce harmful gases and pollute the environment; if the pressure is too low, the gas fuel escapes into the first tube body 2, and the subsequent gas treatment is more troublesome.

[0062] More preferably, the gas fuel delivery monitoring system further includes an audible and visual alarm 10 and a status indicator 11, and the control assembly 7 is electrically connected to the first valve 8, the second valve 9, the audible and visual alarm 10, and the status indicator 11. The audible and visual alarm device and the status indicator 11 can promptly remind the staff that there is a problem with the gas fuel delivery detection system and that it needs to be processed and repaired.

[0063] More preferably, if Figure 2 As shown, the status indicator 11 has:

[0064] State 1: The system works normally;

[0065] State 2: System abnormality, abnormal pressure occurs in the first tube 2;

[0066] State 3: The system fails and the first tube 2 is damaged;

[0067] State 4: The system fails and the second tube body 3 is damaged.

[0068] The status indicator 11 provides feedback on different states of the gas fuel delivery detection system in state one, state two, state three, and state four, so that the staff can have a preliminary understanding of the on-site conditions and do not need to go to the site to determine the damage condition, which is conducive to completing maintenance in a short time.

[0069] More preferably, the control component 7 is configured to:

[0070] The preset pressure in the second tube 3 is denoted as P 1 , the value of the second pressure sensor 5 is recorded as P 2 , the minimum working pressure in the first tube 2 is recorded as P 3 , the value of the first pressure sensor 4 is recorded as P 4 ;

[0071] When the system is working normally, P 4 ≥P 3 , P 1 ≈P 2 At this time, the first valve 8 and the second valve 9 are both in the closed state, and the state indicator 11 displays state 1;

[0072] When the system works for a long time, P 4 A decrease may occur until P 4 <P 3 , the status indicator 11 displays status 2, at this time, the second valve 9 is opened until P 4 ≥P 3 , the second valve 9 is closed, and the status indicator 11 displays status 1;

[0073] When the first tube 2 is damaged, P 4 Rapidly decreases, at this time, the first valve 8 and the second valve 9 are both closed, P 4 Reduce to P 4 =P 2 After that, P 4 When the pressure continues to decrease to atmospheric pressure, the status indicator 11 displays status three, and the sound and light alarm 10 flashes and sounds an alarm;

[0074] When the second tube 3 is damaged, P 4 Rapidly decreases, at this time, the first valve 8 and the second valve 9 are both closed, and the combustible gas detector 6 detects gas fuel leakage, P 4 Reduce to P 4 =P 2 After that, it remains unchanged, the status indicator 11 displays status four, and the sound and light alarm 10 flashes and sounds an alarm.

[0075] Since there will be no leakage of inert gas when the system is working normally, but considering that a small part of the inert gas may escape into the atmosphere through the gaps in some structural connections, the pressure of the inert gas may drop after the system has been working for a long time. At this time, the control component 7 monitors in real time and controls the second valve 9 to replenish the inert gas between the first tube body 2 and the second tube body 3 in time to maintain the pressure by itself.

[0076] Specifically, the detection end of the combustible gas detector 6 is arranged around the outer circumference of the second tube body 3 .

[0077] When the second tube body 3 is damaged, the inert gas enters the second tube body 3 from the damaged part of the second tube body 3, causing an initial drop. Although the air pressure between the first tube body 2 and the second tube body 3 is greater than the air pressure inside the second tube body 3, a small part of the gas fuel will diffuse between the first tube body 2 and the second tube body 3 due to the diffusion phenomenon. The combustible gas detector 6 can detect the gas leakage and perform timely maintenance when the leakage is small to avoid safety problems.

[0078] The second aspect of the present invention provides a maintenance method based on the above-mentioned gas fuel delivery monitoring system:

[0079] When the GVU valve group 1 needs to be repaired, the control component 7 controls the first valve 8 to open and the second valve 9 to close. 4 Until it is equal to atmospheric pressure, at which point the GVU valve body can be opened for inspection;

[0080] When the GVU valve group 1 is overhauled, the GVU valve group 1 is closed, and the control component 7 controls the first valve body to close and the second valve body to open until P 4 ≥P 3 , the status indicator 11 displays status 1, and the gas fuel delivery monitoring system can resume normal operation.

[0081] Before inspecting GVU valve group 1, exhaust the inert gas first to avoid excessive pressure of the inert gas when opening GVU valve group 1, which may cause harm to the staff during inspection.

[0082] In summary, an embodiment of the present invention provides a gas fuel transportation monitoring system and maintenance method, in which an inert gas is introduced between the first tube body 2 and the second tube body 3, and the air pressure between the first tube body 2 and the second tube body 3 is maintained greater than the air pressure inside the second tube body 3. Even if a gas leak occurs in the second tube body 3, due to the pressure difference, the gas will not escape quickly from the damaged part of the second tube body 3, but will only slowly diffuse into the first tube body 2. After the combustible gas detector 6 detects the leak, the staff can perform maintenance intervention in time to ensure safety.

[0083] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A gas fuel delivery monitoring system, characterized in that: include: A GVU valve assembly (1), wherein the GVU valve assembly (1) comprises a first gas channel and a second gas channel, wherein the first gas channel is sleeved on the outer periphery of the second gas channel, and the first gas channel and the second gas channel are not connected to each other; A first tube body (2), the first tube body (2) being connected to the first gas channel, and an inert gas passing through the interior of the first tube body (2); a second tube body (3), the second tube body (3) being connected to the second gas channel, the first tube body (2) being sleeved on the outer circumference of the second tube body (3), and gas fuel flowing inside the second tube body (3); A first pressure sensor (4), the first pressure sensor (4) being connected to the first tube body (2); A second pressure sensor (5), the second pressure sensor (5) being connected to the second tube body (3); A combustible gas detector (6), wherein the combustible gas detector (6) is arranged between the first tube body (2) and the second tube body (3); A control component (7), wherein the control component (7) is electrically connected to the first pressure sensor (4) and the second pressure sensor (5); The air pressure between the first tube (2) and the second tube (3) is greater than the air pressure inside the second tube (3).

2. The gas fuel delivery monitoring system according to claim 1, characterized in that: Also includes: a first valve (8), one end of which is connected to the first tube (2) and the other end of which is connected to external air; A second valve (9), one end of the second valve (9) is connected to the first tube (2), and the other end of the second valve (9) is connected to an inert gas source.

3. The gas fuel delivery monitoring system according to claim 2, characterized in that: It also includes an audible and visual alarm (10) and a status indicator (11), and the control component (7) is electrically connected to the first valve (8), the second valve (9), the audible and visual alarm (10), and the status indicator (11).

4. The gas fuel delivery monitoring system according to claim 3, characterized in that: The status indicator (11) has: State 1: The system works normally; State 2: the system is abnormal, and abnormal pressure occurs in the first tube (2); State three: the system fails and the first tube (2) is damaged; State 4: The system fails and the second tube (3) is damaged.

5. The gas fuel delivery monitoring system according to claim 4, characterized in that: The control component (7) is configured to: The preset pressure in the second tube (3) is recorded as P1, the value of the second pressure sensor (5) is recorded as P2, the minimum working pressure in the first tube (2) is recorded as P3, and the value of the first pressure sensor (4) is recorded as P4; When the system is operating normally, P4≥P3, P1≈P2, at which time, the first valve (8) and the second valve (9) are both in a closed state, and the state indicator (11) displays state 1; After the system has been working for a long time, P4 may decrease until P4 < P3, and the state indicator (11) displays the state 2. At this time, the second valve (9) is opened until P4 ≥ P3, and the second valve (9) is closed, and the state indicator (11) displays the state 1. When the first tube (2) is damaged, P4 drops rapidly. At this time, the first valve (8) and the second valve (9) are both closed. After P4 drops to P4=P2, when P4 continues to drop to atmospheric pressure, the state indicator (11) displays state three, and the sound and light alarm (10) flashes and sounds an alarm. When the second tube (3) is damaged, P4 drops rapidly. At this time, the first valve (8) and the second valve (9) are both closed, and the combustible gas detector (6) detects a gas fuel leak. After P4 drops to P4=P2, P4 remains unchanged, the status indicator (11) displays the status four, and the sound and light alarm (10) flashes and sounds an alarm.

6. A maintenance method, based on the gas fuel delivery monitoring system according to any one of claims 1 to 5, characterized in that: When the GVU valve group (1) needs to be repaired, the control component (7) controls the first valve (8) to open and the second valve (9) to close until P4 is equal to atmospheric pressure. At this time, the GVU valve body can be opened for maintenance; When the GVU valve group (1) is overhauled, the GVU valve group (1) is closed, and the control component (7) controls the first valve body to close and the second valve body to open until P4 ≥ P3, the status indicator (11) displays the state 1, and the gas fuel delivery monitoring system can resume normal operation.

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