LU504188B1

LU504188B1 - A gas power plant leak monitoring device and its working method

Info

Publication number: LU504188B1
Application number: LU504188A
Authority: LU
Inventors: Yantao Liu; Likun Zheng; Bingliang Yang; Feng Sun; Qingjian You; Xindong Hao; Fengguang Dai; Chunxiao Li; Lianmin Ma; Zuyi Sun
Original assignee: Yantai Power Plant Of Huaneng Shandong Power Generation Co Ltd
Priority date: 2023-04-17
Filing date: 2023-05-11
Publication date: 2023-11-13
Also published as: CN116659752A

Abstract

The invention relates to a gas power plant leak monitoring device and a method of workingthereof, wherein the gas power plant leak monitoring device, comprises a sealing box, a leak monitoring section, a gas tightness detection section, a plugging section, an early warningdeviceand a control module. The gas detector and suction fan are located inside the monitoringboxandare capable of drawing air from the sealed box into the gas detector. The gas detector, suctionfan,blocking section, warning device and control module are electrically connected. The inventionissimple in structure and ingenious in design. The pipeline to be monitored is arrangedinasealed environment, effectively solving the problem of difficult detection of gas pipeline leaks intheopen air, and is provided with a blocking section, which can be blocked in time topreventcontinuous leaks from causing safety accidents.

Description

A gas power plant leak monitoring device and its working method /°°*788

Technical field

The present invention relates to the technical field of gas power plant monitoring and in particular to a gas power plant leak monitoring device and its working method.

Background technology

Gas-fired power plants use natural gas as an energy source, with significant green and low-carbon effects, and less environmental impact than coal-fired power plants. Natural gas is the collective name for a mixture of hydrocarbons, with a specific gravity of approximately 0.65, lighter than air, colourless and odourless, with a natural gas explosion limit of 5-15%, the gas power plant natural gas system is the largest source of danger, to ensure that the natural gas system is tight and leak-free is the most fundamental prerequisite to protect the gas power plant.

In order to prevent the natural gas system from leaking and causing a fire and explosion, gas power plants are generally arranged in the open air so that leaking natural gas can spread smoothly to the atmosphere.

A common method of gas leak detection in gas-fired power plants is to use a flammable gas meter to measure each flange, interface, etc. of the gas system. However, when using a flammable gas meter to measure the flanges and interfaces of a gas system in the open air, it is difficult to measure small leaks because small amounts of natural gas are quickly diluted by the air and, in windy conditions, minor leaks are easily blown away by the wind, making it impossible for the flammable gas meter to accurately measure the presence of natural gas leaks in each flange and interface of the gas system.

Therefore, how to provide a gas power plant leak monitoring device and its working method, in order to solve the problem of the difficulty of detecting the leakage of natural gas lines in the open air environment, is the technical problem to be solved by the technical person in the field.

Summary of the invention

To solve the problem of difficulties in detecting leaks in natural gas lines in an open-air environment, the present invention provides a gas power plant leak monitoring device and its working method.

A gas power plant leak monitoring device provided for the purpose of the present invention comprises a sealing box, a leak monitoring section, a gas tightness detection section, a plugging section, an early warning device and a control module.

Sealed box, hollow inside, with openings on opposite sides, capable of being set in the 904188 pipeline to be monitored.

The leak monitoring section is set on top of the sealed box and includes a monitoring box, a flow guide tube, a heat sink, a gas detector and a suction fan.

The monitoring box, hollow inside, is connected at the bottom to one end of the inflow tube and has a heat sink opening at the top of the box.

The other end of the conduit is connected to the top surface of the sealed box.

The gas detector is fixedly attached to the inner top surface of the monitoring box.

The suction fan is set inside the monitoring box and is able to draw air from the sealed box into the gas detector.

The airtightness testing section is provided on the sealing box to test the airtightness of the sealing box.

The blocking section, the warning device and the control module are each mounted on the monitoring box, the blocking section being able to block the inflow pipe and the warning device being used to give a warning signal.

The gas detector, suction fan, blocking section, warning device and control module are electrically connected.

In some of these specific examples, the sealed box comprises an upper housing, a lower housing, a first sealing section and a second sealing section.

The upper and lower housings have curved openings on opposite sides, so that the upper and lower housings can be fitted to each other and set on the pipeline to be monitored, forming a closed monitoring space inside.

The first sealing section is provided at the point where the upper housing, the lower housing and the pipe to be monitored fit together.

The second sealing section is provided at the point where the upper housing fits into the lower housing.

In some of these specific examples, positioning slots are provided in the bottom corners of the upper housing and positioning shafts are provided in the top corners of the lower housing, the positioning shafts being able to be seated in the positioning slots.

In some of these specific examples, the sealed box further comprises reinforcing arcs, with reinforcing arcs provided at the internal corners of the upper housing and reinforcing arcs 904188 provided at the internal corners of the lower housing.

In some of these specific examples, the airtightness testing section includes a water injection pipe, a ventilation pipe, a drain pipe and a valve.

The water injection and ventilation pipes are set on the top surface of the sealed box and are connected to the inside of the box.

The drain pipe is set in the bottom of the sealed box and is connected to the interior of the box.

The water injection, ventilation and drainage pipes are equipped with separate valves.

In some of these specific examples, the blocking section comprises a blower, air guide and air bag.

The blower is fixed to the side wall of the monitoring box and is electrically connected to the control module.

One end of the air duct is connected to the blower and the other end has an air bag attached.

The airbag is set in the infusion tube.

The blower is able to inject air into the airbag through the guide tube in order to expand the airbag and seal the guide tube.

In some of these specific examples, the control module comprises a battery pack, a central processor, a signal transmitter, an audible and visual alarm, a reset and a time relay.

The battery pack is electrically connected to the central processor.

The central processor is electrically connected to the signal transmitter, the audible and visual alarm, the reset and the time relay respectively.

The audible and visual alarm is electrically connected to the resetter.

The time relay is electrically connected to the blower.

In some of these specific examples, the first sealing section is a sealing wrap.

In some of these specific examples, curved blocks are also provided at the curved openings of the upper and lower housings.

A method of working a gas power plant leak monitoring device based on the same idea, comprising the gas power plant leak monitoring device provided in any of the above specific examples, the method of working being as follows:

First the seal box is set on the pipe to be monitored and the airtightness testing section TS 904188 activated to test the seal box for airtightness.

The suction fan is then activated, drawing the gas from the sealed box into the gas detector and realising the function of monitoring gas leaks in the pipeline.

When a gas leak is detected by the gas detector, the control module controls the warning device to send out a warning signal to realise the remote alarm function.

After a predetermined period of time, the control module controls the blocking section and blocks the inflow pipe.

Beneficial effect of the present invention: The gas power plant leak monitoring device of the present invention reduces the influence of the open air environment on gas leak detection by providing a sealed box and a leak monitoring section and arranging the pipeline to be monitored in a sealed environment. A gas-tight detection section is also provided for testing the gas-tightness of the sealed box to improve the accuracy of gas leak detection. It is also provided with a control module, an early warning device and a blocking section. When a gas leak is detected, the departure early warning device issues an early warning signal and the control module controls the blocking section to block the inflow pipe after a predetermined period of time, so as to avoid a continuous gas leak and a dangerous accident when the docking point of the gas transmission pipe cannot be repaired in time. The invention is simple in structure and ingenious in design, effectively solving the problem of difficulty in detecting leaks in gas pipelines in an open-air environment, and is provided with a blocking section that can be blocked in time to prevent safety accidents caused by continuous leaks.

Description of attached figures

Figure 1 is a schematic diagram of the structure of some specific examples of a gas power plant leak monitoring device of the present invention;

Figure 2 is an expanded view of the sealed box of the leak monitoring device for gas power plants shown in Fig. 1;

Figure 3 is a schematic diagram of the structure of the monitoring box of the gas power plant leak monitoring device shown in Figure 1;

Figure 4 is a schematic diagram of the structure of the control module of the gas power plant leak monitoring device of the present invention.

In the attached drawings, 10, leak monitoring section; 11, monitoring box; 12, gas detector;

13, suction fan; 14, control module; 15, flow guide tube; 16, heat dissipation hole; 20, sealing. 504188 box; 21, sealing housing; 22, first sealing section; 23, positioning shaft; 24, arc block; 25, reinforcement arc; 26, second sealing section; 30, gas tightness detection section; 31, water injection pipe; 32 33, outlet pipe; 40, blocking section; 41, blower; 42, air guide; 43, air bag. 5 Specific embodiments

The technical solutions in the examples of the invention will be described clearly and completely below in conjunction with the accompanying drawings in the examples of the invention, it being clear that the examples described are only a part of the examples of the invention and not all of them.

Examples of the described examples are shown in the accompanying drawings, wherein the same or similar symbols from beginning to end indicate the same or similar components or components having the same or similar functions. The examples described below by reference to the accompanying drawings are exemplary and are intended to be used to explain the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "top", "bottom", "inside", "outside", "axis", "circumferential", etc. indicate orientation or positional relationships based on the attached drawings and are intended only to facilitate or simplify the description, and not to indicate or imply that the device referred to is a device, "axis", "circumferential", etc. indicate orientations or positional relationships based on those shown in the accompanying drawings and are intended only to facilitate or simplify the description of the invention and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and is therefore not to be construed as limiting the invention.

Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or as implicitly specifying the number of technical features indicated. Thus, a feature qualified with "first" and "second" may explicitly or implicitly include one or more such features. In the description of the present invention, "plurality" means two or more, unless otherwise expressly and specifically limited.

In the present invention, unless otherwise expressly specified and limited, the terms

"mounted", "connected", "joined", "fixed", "articulated", "articulated", "hinged", etc. shall be 504188 understood in a broad sense, e.g. as a fixed connection, as a removable connection, or as an integral part; as a mechanical connection or as an electrical connection. ", "articulation", "articulation" and the like shall be understood in a broad sense, e.g. as a fixed connection, as a detachable connection or as an integral part, as a mechanical connection or as an electrical connection, as a direct connection or as an indirect connection through an intermediate medium, as a connection within two elements. or indirectly via an intermediate medium; it can be a connection within two elements or an interactive relationship between two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the context of the present invention can be understood on a case-by-case basis.

Therefore, the present invention provides a gas power plant leak monitoring device and its working method to solve the problem of difficulties in detecting natural gas line leaks in an open-air environment.

With reference to Figures 1, 2 and 3, a gas power plant leak monitoring device comprising a sealing box 20, a leak monitoring section 10, a gas tight detection section 30, a sealing section 40, an early warning device and a control module 14.

Sealed box 20, hollow inside, with openings on opposite sides, capable of being set in the pipeline to be monitored.

The leak monitoring section 10 is set on the top of the sealed box 20 and includes a monitoring box 11, a flow guide 15, a heat sink 16, a gas detector 12 and a suction fan 13.

The monitoring box 11, hollow inside, is connected at the bottom to one end of the inflow tube 15, and a heat sink 16 is also provided at the top of the monitoring box 11.

The other end of the conduit 15 is connected to the top surface of the sealed box 20.

The gas detector 12 is fixedly attached to the inner top surface of the monitoring box 11. 0506188

The suction fan 13 is set inside the monitoring box 11 and is able to draw air from the sealed box 20 into the gas detector 12.

The airtightness testing section 30 is provided on the sealing box 20 for testing the airtightness of the sealing box 20.

The blocking section 40, the warning device and the control module 14 are each provided on the monitoring box 11. The blocking section 40 is capable of blocking the inflow pipe 15 and the warning device is used to issue a warning signal.

The gas detector 12, the suction fan 13, the blocking section 40, the warning device and the control module 14 are electrically connected.

Specifically, the sealed box 20 is located on the pipeline to be monitored, and the interior is sealed and isolated from the outside environment, which can effectively reduce the influence of the open environment on gas leak detection and improve the accuracy of detection. A leak monitoring section 10 is provided at the top of the sealed box 20, including a monitoring box 11, a gas detector 12 arranged inside the box 11 and a suction fan 13. The monitoring box 11 is connected to the sealed box 20 through a flow guide tube 15, and the suction fan 13 enables the gas inside the sealed box 20 to be sucked into the gas detector 12 through the flow guide tube 15 in order to complete the monitoring of the local gas leakage of the pipeline. There are also heat sink holes 16 in the top of the monitoring box 11, which help to discharge the gas and reduce the temperature of the monitoring box 11.

It will be appreciated that the invention is simple in structure and subtle in design, effectively solving the problem of the difficulty of detecting leaks in gas pipes in an open-air environment. The sealed box 20 can isolate the pipeline to be monitored from the open air environment, avoiding the influence of natural wind in the open air environment; the gas in the sealed box 20 can be sucked into the gas detector 12 through the suction fan 13, which can improve the detection of micro-leakage situations and prevent the leakage from being detected due to the small amount of leakage and low gas concentration. The sealed box 20 is also provided with a gas tightness detection section 30, which allows the gas tightness inside the sealed box 20 to be tested before the gas is tested, to prevent the sealed box 20 from leaking and thus affecting the test results.

It will be appreciated that the invention is also provided with a plugging section 40, an carly 904 88 warning device and a control module 14. When the gas detector 12 detects a gas leak, it transmits a signal to the control module 14, which controls the early warning device to issue an early warning signal to alert staff that there is a gas leak in the monitored pipeline. After a predetermined period of time, the control module 14 controls the sealing section 40 to seal the sealing box 20 to avoid continuous gas leakage and dangerous accidents when the docking point of the gas transmission pipeline cannot be repaired in time.

In some specific examples of the invention, the sealing box 20 comprises an upper housing, a lower housing, a first sealing section 22 and a second sealing section 26.

The first sealing section 22 is provided at the point where the upper housing, the lower housing and the pipe to be monitored fit together.

The second sealing section 26 is provided at the point where the upper housing fits into the lower housing.

Specifically, the sealing box 20 is a sealed housing 21 formed by fitting the upper housing and the lower housing together, with a hollow interior and circular openings on opposite sides, capable of being set in the pipeline to be monitored. The upper housing and the lower housing have curved openings on opposite sides, the upper housing and the lower housing are laminated to each other to form the sealed housing 21, and the two curved openings are laminated to form a circular opening. The first sealing part 22 is provided at the circular opening to seal the gap between the pipeline to be monitored and the sealing shell 21; the second sealing part 26 is provided at the place where the upper and lower shells fit together.

It can be understood that the seal box 20 for the upper shell and lower shell design, can make the overall device more flexible, flexible monitoring point position, easy to move, only need to be monitored in the pipeline out of the assembly of the seal shell 21 to form the seal box 20 can complete the isolation of the external environment, so as to improve the monitoring accuracy. To further reduce the influence of the external environment on the gas leak detection, a first sealing part 22 and a second sealing part 26 are also provided, the first sealing part 22 is used to fill the gap between the sealing housing 21 and the pipeline, and the second sealing part OH 88 26 1s used to fill the gap between the upper housing and the lower housing, in order to form an airtight space inside the sealing housing 21 and discharge the influence of the external environment.

In some specific examples of the present invention, positioning slots are provided at the bottom corners of the upper housing and positioning shafts 23 are provided at the top corners of the lower housing, the positioning shafts 23 being able to be seated with the positioning slots.

In some specific examples of the invention, the sealed box 20 further comprises a reinforcing arc 25, with the reinforcing arc 25 provided at the internal corners of the upper housing and the reinforcing arc 25 provided at the internal corners of the lower housing.

Specifically, a positioning slot is provided at the bottom corners of the upper casing and a positioning shaft 23 is fixedly linked to the top corners of the lower casing, the positioning shaft 23 is able to snap into the positioning slot, thus limiting the relative position of the upper casing and the lower casing, thus making the installation of the upper casing and the lower casing more convenient, the positioning shaft 23 can be inserted into the positioning slot to complete the alignment of the upper casing and the lower casing, which can then be fixed by bolts to complete the The installation is completed with bolts. To ensure the strength of the overall structure, the internal corners of the upper and lower housings are provided with reinforcement arcs 25, which can increase the overall stiffness.

In some specific examples of the invention, the airtightness testing section 30 comprises a water injection pipe 31, a ventilation pipe 32, a drain pipe and a valve.

The water injection pipe 31 and the ventilation pipe 32 are provided on the top surface of the sealed box 20 and are connected to the interior of the box 20.

The drain pipe is provided at the bottom of the sealed box 20 and is connected to the interior of the sealed box 20.

The water injection pipe 31, the ventilation pipe 32 and the drainage pipe are each provided with a valve.

Specifically, the water injection pipe 31 and the ventilation pipe 32 are set on the top surface of the upper housing and run through it; the drainage pipe is set on the side of the lower housing and is set close to the bottom surface, capable of being connected to the interior of the sealed housing 21. LUS04188

It will be appreciated that the water injection pipe 31 is located on the top surface to help inject water into the seal box 20 and thereby test the airtightness of the seal box 20; the ventilation pipe 32 is able to remove excess air from the interior and is located on the top surface so as not to interfere with the water injection process; the drainage pipe is arranged at the bottom of the seal box 20 to help remove water from the seal box 20 after the airtightness test has been completed.

In some specific examples of the invention, the blocking section 40 comprises a blower 41, an air guide 42 and an air bag 43.

The blower 41 is fixedly attached to the side wall of the monitoring box 11 and is electrically connected to the control module 14.

One end of the air duct 42 is connected to the blower 41 and the other end is connected to an air bag 43.

The airbag 43 is set inside the inflow tube 15.

The blower 41 is able to inject air into the air bladder 43 through the air guide 42 in order to expand the air bladder 43 and seal the inflow pipe 15.

Specifically, the blower 41 is provided on the outer wall of the monitoring box 11 and is connected to the airbag 43 through the air duct 42. When the blower 41 is activated, air is injected into the air bladder 43, which expands and blocks the air duct 15, isolating the sealed box 20 from the monitoring box 11.

Understandably, if a gas leak is detected and workers are unable to repair the leak in time, a prolonged gas leak will cause a safety incident, at which point the blocking section 40 is activated to isolate the sealed box 20, preventing the gas leak from entering the air and waiting for workers to carry out repairs.

Referring to Figure 4, in some specific examples of the present invention, the control module 14 comprises a battery pack, a central processor, a signal transmitter, an audible and visual alarm, a resetter and a time relay.

The battery pack is electrically connected to the central processor.

The audible and visual alarm is electrically connected to the resetter. 0506188

The time relay is electrically connected to the blower 41.

Specifically, the device of this example is powered through the battery pack, when the gas detector 12 detects a gas leak, the central processor receives the data information from the gas detector 12 and analyses it, then sends the signal through the signal transmitter to control the early warning device to activate the sound and light alarm to achieve the alarm function, when the early warning device is activated, the time relay enters the countdown at the same time, and after reaching a predetermined time, it feeds back the signal to the central processor, the central processor starts the blower 41, which in turn fills the air bag 43 inside the inflow pipe 15 to seal the inflow pipe 15.

It can be understood that when a gas leak is detected, the control module 14 can promptly upload the data information and activate the warning device to issue a warning signal to alert the nearby workers of a gas leak; at the same time, it will also activate the time relay to automatically start the blower 41 to seal the inflow pipe 15 after a predetermined time. In this way, gas leakage information can be transmitted in a timely manner, and after a predetermined time, if workers are unable to repair the leakage in time, or if leakage information is found, the inflow pipe 15 can be blocked in time to avoid continuous leakage in the gas transmission pipeline in order to cause safety accidents.

In some specific examples of the invention, the first sealing section 22 is a sealing wrap.

Specifically, the sealing tape is wrapped around the opposite sides of the docking points of the pipes to be monitored, with a controlled thickness of 10-15 mm.

In some specific examples of the invention, the arched openings in the upper and lower housings are also provided with arched blocks 24.

It will be appreciated that the curved block 24 is the same shape as the opening and can be fitted to the pipeline to be monitored to improve the sealing effect of the sealing box 20.

The present invention also provides a method of working a gas power plant leak monitoring device comprising the gas power plant leak monitoring device provided in any of the above specific examples, the method of working being as follows:

First the seal box 20 is set on the pipe to be monitored and the gas tightness test section 30 is activated to test the gas tightness of the seal box 20.

The suction fan 13 then activates, drawing the gas in the sealed box 20 into the gas detector 904188 12, realising the function of monitoring gas leaks in the pipeline.

When the gas detector 12 detects a gas leak, the control module 14 controls the warning device to issue a warning signal to achieve the remote alarm function.

The control module 14 controls the blocking section 40 after a predetermined time has elapsed, blocking the inflow pipe 15.

Specifically, first position the pipeline to be monitored, assemble the upper housing with the lower housing, and insert the positioning shaft 23 into the positioning slot. After fitting, the first sealing part 22 is wound at the fitting of the pipeline and the sealing shell 21, the winding thickness is controlled at 10-15 mm; the second sealing part 26 is filled at the fitting of the upper shell and the lower shell and fixed by bolts to complete the arrangement of the sealing box 20.

Before testing, the air tightness of the seal box 20 needs to be tested by tightening the valve of the drain pipe and injecting water into the seal box 20 through the inlet pipe. After filling, leave it for 5-10min and observe whether water stains appear in the seal box 20. If water stains are observed to appear, tighten the corresponding bolts on both sides to achieve a seal. After ensuring the airtightness, open the drainage pipe to drain the water inside the sealed box 20 and then close the valves of the water injection pipe 31, the ventilation pipe 32 and the drainage pipe.

When detecting, the suction fan 13 is activated to suck the gas out of the sealed box 20 and inhale it to the gas detector 12. When the gas detector 12 detects a gas leak, it transmits the information to the central processing, which sends out the gas leak information through the signal transmitter and controls the warning device to issue a warning signal; at the same time, the time relay is activated. After a predetermined period of time, the central processor receives feedback and starts the blower 41 to seal the inflow pipe 15 to avoid continuous gas leakage, which can cause safety accidents.

In the description of this specification, reference to the terms "an example", "some examples", "example", "specific example ", "a specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the example or example are included in at least one example or example of the present invention. In this specification, schematic expressions of terms do not necessarily refer to the same example or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more of the examples or examples. 0506188

The above is only a preferred specific example of the present invention, but the scope of protection of the present invention is not limited thereto, and any equivalent substitution or change made by any person skilled in the art in accordance with the technical solutions of the present invention and the conception of the invention thereof, within the scope disclosed herein, shall be covered by the scope of protection of the present invention.

Claims

CLAIMS LU504188

1. À gas power plant leak monitoring device, characterised in that it comprises: a sealing box, a leak monitoring section, a gas tightness detection section, a blocking section, an early warning device and a control module; A sealed box, hollow inside, with openings on opposite sides, capable of being set in the pipeline to be monitored, Said leak monitoring section is provided at the top of said sealed box and includes a monitoring box, a flow guide tube, a heat sink, a gas detector and a suction fan; Said monitoring box, hollow inside and connected at the bottom to one end of said inflow tube, said monitoring box also having heat sink holes in the top; The other end of said inflow tube is connected to the top surface of said sealed box; Said gas detector is fixedly attached to the inner top surface of said monitoring box; Said suction fan is provided inside said monitoring box and is capable of drawing air from said sealed box into said gas detector; Said airtightness testing section is provided on said sealed box for testing the airtightness of said sealed box; Said blocking section, said early warning device and said control module are each provided on said monitoring box, said blocking section being able to block said inflow pipe and said early warning device being used to give an early warning signal; Said gas detector, said suction fan, said blocking section, said warning device and said control module are electrically connected.

2. The gas power plant leak monitoring device according to claim 1, wherein said sealed box comprises an upper housing, a lower housing, a first sealing section and a second sealing section: Said upper housing, said lower housing have curved openings on opposite sides, said upper housing and said lower housing are able to fit into each other and are set on the pipe to be monitored, forming a closed monitoring space inside; Said first sealing section is provided at the point where said upper housing, said lower housing and the line to be monitored fit together;

Said second sealing section is provided at the point where said upper housing fits into sad 904188 lower housing.

3. The gas power plant leak monitoring device according to claim 2, wherein said positioning slots are provided at the bottom corners of said upper housing and said positioning shafts are provided at the top corners of said lower housing, said positioning shafts being capable of being seated in said positioning slots.

4. The gas power plant leak monitoring device according to claim 2, wherein said sealing box further comprises a reinforcing arc, said reinforcing arc being provided at the internal corners of said upper housing and said reinforcing arc being provided at the internal corners of said lower housing.

5. The gas power plant leak monitoring device according to claim 1, wherein said gas tight detection section comprises a water injection pipe, a ventilation pipe, a drain pipe and a valve; Said water injection pipe and said ventilation pipe are provided on the top surface of said sealed box and are connected to the interior of said sealed box; Said drainage pipe is provided at the bottom of said sealed box and is connected to the interior of said sealed box; Said water injection pipe, said ventilation pipe and said drain pipe are each provided with a valve.

6. The gas power plant leak monitoring device according to claim 1, wherein said blocking section comprises a blower, an air guide and an air bag; Said blower is fixedly connected to the side wall of said monitoring box and electrically connected to said control module; (a) Said air guide duct is connected at one end to said blower and at the other end to said air bag; Said airbag is provided within said inflow tube; Said blower is capable of injecting air into said air bladder through said guide pipe in order to expand said air bladder and seal said guide pipe.

7. The gas power plant leak monitoring device according to claim 6, wherein said control module comprises a battery pack, a central processor, a signal transmitter, an audible and visual alarm, a reset and a time relay;

Said battery pack is electrically connected to said central processor; 0506188 Said central processor is electrically connected to said signal transmitter, audible and visual alarm, resetter and time relay respectively; Said audible and visual alarm is electrically connected to said resetter; Said time relay is electrically connected to said blower.

8. The leak monitoring device for gas power plants according to claim 2, wherein said first sealing part is a sealing wrap.

9. The gas power plant leak monitoring device according to claim 2, wherein said upper housing and said lower housing are further provided with arched blocks at the arched openings.

10. A method of working a gas power plant leak monitoring device, characterised in that it comprises the gas power plant leak monitoring device of any one of claims 1-9, working as follows: First said sealing box is sited on the pipe to be monitored and said airtightness testing section is activated to test the airtightness of said sealing box; Then said suction fan is activated to draw the gas in said sealed box into said gas detector, enabling the monitoring of gas leaks in the pipeline; When said gas detector detects a gas leak, said control module controls said early warning device to issue an early warning signal to achieve a remote alarm function Said control module controls said blocking section after a predetermined time, to block said inflow pipe.