A gas turbine intelligent purge gas leakage detection device

Abstract

The utility model relates to an intelligent purge gas leakage detection device for a gas turbine, comprising an exhaust pipeline (10) of the gas turbine; a purge module (20), wherein a plurality of purge modules (20) are arranged on the inner wall of the exhaust pipeline (10) and are spaced apart along a spiral line; and a concentration detection module (30); a processor is used to determine whether the maximum value of the combustible gas concentration detected by the plurality of concentration detection modules (30) is greater than or equal to a preset threshold value; if so, it indicates that there is an area with a high combustible gas concentration in the exhaust pipeline (10), and the purge module (20) is started to purge the exhaust pipeline (10); if not, it indicates that the combustible gas concentration in the exhaust pipeline (10) is low, and the machine can be started directly, thereby balancing the purge time and the start time, avoiding an excessively long purge time from increasing the grid connection time and the response speed to the grid when the unit is started, and at the same time avoiding cooling of the heating components of the gas turbine and the boiler, thereby affecting the performance of the hot start unit.

Description

Technical Field

[0001] The utility model relates to the technical field of gas turbines, in particular to an intelligent purge gas leakage detection device for a gas turbine. Background Art

[0002] In gas-fired generator sets, combustible materials may accumulate in the gas turbine exhaust piping. When the turbine is started, it is essential to ensure that no explosive mixtures are present at the turbine exhaust. Therefore, proper boiler ventilation is essential before ignition. According to the National Fire Protection Association's NFPA 85 standard, the purge time must be at least five minutes, and the required purge air volume must be at least five times the boiler volume. However, excessively long purge times increase the unit's startup time, increase grid connection time, and increase the grid's response speed. This also accelerates the cooling of the gas turbine and boiler's heated components, impacting the unit's performance during hot start-up. Utility Model Content

[0003] The technical problem to be solved by the present invention is that it is currently necessary to purge the exhaust pipeline of the gas turbine, but an excessively long purge time will increase the grid connection time and response speed to the power grid when the unit is started, while accelerating the cooling of the gas turbine and boiler heating components, affecting the performance of the hot start unit.

[0004] In order to solve the above problems, the utility model provides a gas turbine intelligent purge gas leakage detection device, comprising an exhaust pipeline of the gas turbine; a purge module, wherein a plurality of purge modules are arranged on the inner wall of the exhaust pipeline and spaced apart along a spiral line; an air inlet end of the purge module is connected to a gas storage device through an air pipe group;

[0005] a concentration detection module, which is connected to one end of the sampling line, the other end of which is arranged on the purge module, so as to detect the combustible gas concentration in the exhaust line;

[0006] The processor is electrically connected to the purge module and the concentration detection module, and takes the maximum value of the combustible gas concentration detected by multiple concentration detection modules, and starts the purge module when the maximum value is greater than or equal to a preset threshold.

[0007] The gas turbine intelligent purge gas leakage detection device provided by the utility model also has the following technical features:

[0008] The purge module includes a connecting tube and a pressure plate. One end of the connecting tube is connected to the air pipe group. The other end of the connecting tube is rotatably provided with a pressure plate. A plurality of guide grooves are circumferentially spaced apart on the pressure plate, and the guide grooves are connected to the connecting tube.

[0009] The guide groove comprises a straight groove (251) and an arc-shaped groove (252) provided on the outer surface of the pressure plate, one end of the straight groove (251) is connected to one end of the arc-shaped groove (252), the other end of the straight groove (251) passes through one end surface of the pressure plate, and the other end of the arc-shaped groove (252) passes through the other end surface of the pressure plate.

[0010] The inner hole diameter of the other end of the connecting cylinder gradually decreases from being away from the pressure plate to being close to the pressure plate.

[0011] The connecting cylinder is an L-shaped cylinder, and the pressure plate is rotatably arranged at the other end of the connecting cylinder through a rotating shaft.

[0012] The air pipe group includes a main pipe and a branch pipe. One end of the main pipe is connected to the air storage device, the other end of the main pipe is connected to one end of multiple branch pipes, and the other end of the branch pipe is connected to one end of the connecting tube.

[0013] The branch pipe is provided with a flow regulating module and a pressure regulating module, and both the flow regulating module and the pressure regulating module are electrically connected to the processor.

[0014] It also includes a database, which is used to store the combustible gas concentrations detected by multiple concentration detection modules in real time.

[0015] The present invention has the following beneficial effects: the processor determines whether the maximum value of the combustible gas concentration detected by multiple concentration detection modules is greater than or equal to a preset threshold value. If so, it means that there is an area with a high combustible gas concentration in the exhaust pipeline, and the purge module is started to purge the exhaust pipeline. If not, it means that the combustible gas concentration in the exhaust pipeline is low, and the unit can be started directly, thereby balancing the purge time and the start-up time, avoiding excessive purge time that increases the grid connection time and response speed to the power grid when the unit is started, and at the same time avoiding cooling of the heated components of the gas turbine and boiler, affecting the performance of the hot start unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a connection diagram of the utility model;

[0017] Figure 2 Set up a diagram for the location of the purge module;

[0018] Figure 3 It is a partial cross-sectional view of the purge module;

[0019] Figure 4 It is a structural diagram of the pressure plate. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other.

[0021] like Figures 1 to 4 As shown, the intelligent purge gas leakage detection device for a gas turbine of the present invention includes an exhaust pipeline 10 of a gas turbine, and further includes:

[0022] Purge modules 20, multiple purge modules 20 are arranged on the inner wall of the exhaust pipeline 10 and are spaced apart along the spiral line; the air inlet end of the purge module 20 is connected to the air storage device 22 through the air pipe group 21;

[0023] a concentration detection module 30 , which is in communication with one end of a sampling line 31 , the other end of which is disposed on the purge module 20 , to detect the combustible gas concentration in the exhaust line 10 ;

[0024] The processor is electrically connected to the purge module 20 and the concentration detection module 30, and takes the maximum value of the combustible gas concentrations detected by the multiple concentration detection modules 30, and starts the purge module 20 when the maximum value is greater than or equal to a preset threshold.

[0025] The processor determines whether the maximum value of the combustible gas concentration detected by the multiple concentration detection modules 30 is greater than or equal to a preset threshold value. If so, it means that there is an area with a high combustible gas concentration in the exhaust pipeline 10, and the purge module 20 is started to purge the exhaust pipeline 10. If not, it means that the combustible gas concentration in the exhaust pipeline 10 is low, and the unit can be started directly, thereby balancing the purge time and the start-up time, avoiding excessive purge time that increases the grid connection time and response speed to the grid when the unit is started, and at the same time avoiding cooling of the heated components of the gas turbine and boiler, affecting the performance of the hot start unit.

[0026] The gas stored in the gas storage device 22 may be air.

[0027] The system may further include an alarm electrically connected to the processor, and when the maximum value of the combustible gas concentration detected by the plurality of concentration detection modules 30 is greater than or equal to a preset threshold, the alarm is activated to sound an alarm.

[0028] The preset threshold value may be selected and set according to the gas turbine operation requirements. For example, the preset threshold value of the combustible gas concentration may be set to 25%.

[0029] The processor may be connected to the purge module 20 and the concentration detection module 30 by wire or wirelessly. In the case of wireless connection, a corresponding wireless communication module may be provided in each module.

[0030] Preferably, see Figure 3 、 Figure 4The purge module 20 includes a connecting tube 23 and a pressure plate 24. One end of the connecting tube 23 is connected to the air pipe group 21. The other end of the connecting tube 23 is rotatably provided with a pressure plate 24. A plurality of guide grooves 25 are circumferentially spaced apart on the pressure plate 24. The guide grooves 25 are connected to the connecting tube 23.

[0031] When the purge module 20 is started, under the control of the processor, the gas in the gas storage device 22 flows to the connecting tube 23 through the gas pipe group 21, and then flows out of the pressure plate 24 through multiple guide grooves 25, so as to realize gas purge action in multiple directions, thereby improving the purge effect and purge efficiency of the exhaust pipeline 10.

[0032] Preferably, the guide groove 25 includes a straight groove 251 and an arc-shaped groove 252 opened on the outer surface of the pressure plate 24, one end of the straight groove 251 is connected to one end of the arc-shaped groove 252, the other end of the straight groove 251 passes through one end surface of the pressure plate 24, and the other end of the arc-shaped groove 252 passes through the other end surface of the pressure plate 24.

[0033] The gas in the gas storage device 22 flows to the connecting tube 23 through the gas pipe group 21, and then flows out of the pressure plate 24 through the straight groove 251 and the arc groove 252 in sequence. The pressure plate 24 is rotated under the action of the arc groove 252, thereby realizing the rotation of the pressure plate 24 to perform gas purge action in multiple directions, further improving the purge effect and purge efficiency of the exhaust pipeline 10.

[0034] The shape of the pressure plate 24 is preferably a truncated cone, with a smaller diameter at the end close to the connecting tube 23 and a larger diameter at the end away from the connecting tube 23, so that the gas flowing out of the guide groove 25 can be purged over a larger range.

[0035] One end of the straight groove 251 is tangentially and smoothly connected to one end of the arc-shaped groove 252 .

[0036] The other end of the straight groove 251 passes through an end surface of the pressure plate 24 close to the connecting tube 23 , and the other end of the arcuate groove 252 passes through an end surface of the pressure plate 24 away from the connecting tube 23 .

[0037] The other end of the arc-shaped groove 252 is consistent with the exhaust direction of the exhaust pipeline 10, so as to facilitate the exhaust of combustible gas.

[0038] Preferably, the inner hole diameter of the other end of the connecting cylinder 23 gradually decreases from away from to close to the pressure plate 24 .

[0039] Before the gas flows to the pressure plate 24 , the flow rate of the gas is increased to facilitate pushing the pressure plate 24 to rotate.

[0040] The inner hole wall of the other end of the connecting tube 23 is in contact with the outer surface of the pressure plate 24 and rotates therewith.

[0041] Preferably, the connecting cylinder 23 is an L-shaped cylinder, and the pressure plate 24 is rotatably disposed at the other end of the connecting cylinder 23 via a rotating shaft 26 .

[0042] One end of the rotating shaft 26 is fixed to the pressure plate 24 , and the other end is rotationally sealed to the inner wall of the connecting tube 23 .

[0043] Preferably, see Figure 1 The air pipe group 21 includes a main pipe 27 and a branch pipe 28. One end of the main pipe 27 is connected to the air storage device 22, the other end of the main pipe 27 is connected to one end of multiple branch pipes 28, and the other end of the branch pipe 28 is connected to one end of the connecting tube 23.

[0044] Preferably, a flow regulating module 11 and a pressure regulating module 12 are provided on the branch pipe 28 , and both the flow regulating module 11 and the pressure regulating module 12 are electrically connected to the processor.

[0045] The gas flow in the branch pipe 28 is monitored in real time by the flow regulating module 11 and controlled in real time by the processor; the gas pressure in the branch pipe 28 is monitored in real time by the pressure regulating module 12 and controlled in real time by the processor.

[0046] Preferably, a database is also included, which is used to store the combustible gas concentrations detected by multiple concentration detection modules 30 in real time.

[0047] The working principle of this utility model is as follows:

[0048] Before the gas turbine is started, multiple concentration detection modules 30 detect the combustible gas concentrations at different locations in the exhaust pipeline 10. The processor determines whether the maximum value of the detected combustible gas concentrations is greater than or equal to a preset threshold. If so, it indicates that there is an area with a high combustible gas concentration in the exhaust pipeline 10, and the purge module 20 is started to purge the exhaust pipeline 10. If not, it indicates that the combustible gas concentration in the exhaust pipeline 10 is low, and the turbine can be started directly, thereby balancing the purge time and the startup time, avoiding excessive purge time that increases the grid connection time and response speed of the unit when starting, and at the same time avoiding cooling of the gas turbine and boiler heating components, which affects the performance of the hot-start unit.

[0049] When the purge module 20 is started, under the control of the processor, the gas in the gas storage device 22 flows to the connecting tube 23 through the main pipe 27 and the branch pipe 28 of the air pipe group 21 in turn, and then flows out of the pressure plate 24 through the straight groove 251 and the arc groove 252 in turn, and the pressure plate 24 is rotated under the action of the arc groove 252, so that the pressure plate 24 can rotate to perform gas purge action in multiple directions, further improving the purge effect and purge efficiency of the exhaust pipeline 10; at the same time, the gas flow in the branch pipe 28 is monitored in real time by the flow regulation module 11, and controlled in real time by the processor; the gas pressure in the branch pipe 28 is monitored in real time by the pressure regulation module 12, and controlled in real time by the processor; in addition, the purge time of the purge module 20 is controlled by the processor.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A gas turbine intelligent purge gas leakage detection device, comprising an exhaust pipeline (10) of a gas turbine, characterized in that: Also includes: A purge module (20), wherein a plurality of purge modules (20) are arranged on the inner wall of the exhaust pipeline (10) and are spaced apart along the spiral line; an air inlet end of the purge module (20) is connected to the air storage device (22) via an air pipe group (21); A concentration detection module (30) which is in communication with one end of a sampling pipeline (31), wherein the other end of the sampling pipeline (31) is arranged on the purge module (20) to detect the concentration of combustible gas in the exhaust pipeline (10); A processor is electrically connected to the purge module (20) and the concentration detection module (30), and takes the maximum value of the combustible gas concentrations detected by the multiple concentration detection modules (30), and starts the purge module (20) when the maximum value is greater than or equal to a preset threshold value.

2. The gas turbine intelligent purge gas leakage detection device according to claim 1, characterized in that: The purge module (20) comprises a connecting tube (23) and a pressure plate (24); one end of the connecting tube (23) is in communication with the air pipe assembly (21); the other end of the connecting tube (23) is rotatably provided with the pressure plate (24); a plurality of guide grooves (25) are circumferentially spaced apart on the pressure plate (24); the guide grooves (25) are in communication with the connecting tube (23).

3. The gas turbine intelligent purge gas leakage detection device according to claim 2, characterized in that: The guide groove (25) comprises a straight groove (251) and an arc-shaped groove (252) formed on the outer surface of the pressure plate (24); one end of the straight groove (251) is connected to one end of the arc-shaped groove (252); the other end of the straight groove (251) penetrates one end surface of the pressure plate (24); and the other end of the arc-shaped groove (252) penetrates the other end surface of the pressure plate (24).

4. The gas turbine intelligent purge gas leakage detection device according to claim 3, characterized in that: The diameter of the inner hole at the other end of the connecting tube (23) gradually decreases from being away from the pressure plate (24) to being close to the pressure plate (24).

5. The gas turbine intelligent purge gas leakage detection device according to claim 2, characterized in that: The connecting cylinder (23) is an L-shaped cylinder, and the pressure plate (24) is rotatably arranged at the other end of the connecting cylinder (23) via a rotating shaft (26).

6. The gas turbine intelligent purge gas leakage detection device according to claim 2, characterized in that: The air pipe group (21) comprises a main pipe (27) and a branch pipe (28); one end of the main pipe (27) is connected to the air storage device (22); the other end of the main pipe (27) is connected to one end of a plurality of branch pipes (28); and the other end of the branch pipe (28) is connected to one end of the connecting tube (23).

7. The gas turbine intelligent purge gas leakage detection device according to claim 6, characterized in that: The branch pipe (28) is provided with a flow regulating module (11) and a pressure regulating module (12), and the flow regulating module (11) and the pressure regulating module (12) are both electrically connected to the processor.

8. The gas turbine intelligent purge gas leakage detection device according to claim 1, characterized in that: It also includes a database, which is used to store the combustible gas concentrations detected by the multiple concentration detection modules (30) in real time.

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