CN114017185A - Nitrogen-filled air resistance leakage-preventing system for natural gas adjusting pipeline of gas turbine - Google Patents
Nitrogen-filled air resistance leakage-preventing system for natural gas adjusting pipeline of gas turbine Download PDFInfo
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- CN114017185A CN114017185A CN202111180309.XA CN202111180309A CN114017185A CN 114017185 A CN114017185 A CN 114017185A CN 202111180309 A CN202111180309 A CN 202111180309A CN 114017185 A CN114017185 A CN 114017185A
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- gas turbine
- fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/222—Fuel flow conduits, e.g. manifolds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/22—Fuel supply systems
- F02C7/232—Fuel valves; Draining valves or systems
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention provides a nitrogen-filled air-resistance leakage-preventing system for a natural gas adjusting pipeline of a gas turbine, which comprises a fuel pipeline, a shunt pipe, a gas turbine body and a fuel adjusting valve, wherein the fuel pipeline is communicated with the shunt pipe, the shunt pipe is communicated with a fuel inlet of the gas turbine body, and the fuel adjusting valve is respectively fixed on a plurality of branch pipes of the shunt pipe. The invention can assist the pipeline between the stop valve and the speed ratio valve to form air resistance, reduce the number of the emptying valves to groups while stopping natural gas from leaking to the gas turbine body, greatly reduce the risk of tripping operation of a misoperation unit, detect pressure through a mechanical structure, have high reliability, increase the pressure of a second pressure area through the buffer mechanism when the natural gas leaks, avoid frequently starting the nitrogen-filled pump to work, reduce energy consumption, and buffer the pressure fluctuation of gas through the buffer mechanism when the fuel pipeline inputs fuel to the gas turbine body, thereby improving the stability.
Description
Technical Field
The invention relates to the technical field of leakage prevention of gas turbines, in particular to a leakage prevention system for a natural gas adjusting pipeline of a gas turbine through nitrogen filling and air resistance.
Background
After the gas turbine is shut down, in order to guarantee the hot standby state of the unit, the natural gas fuel regulating pipeline needs to store the natural gas with working pressure, but in order to prevent the natural gas leaking to the gas turbine body due to valve internal leakage and residual natural gas, the natural gas leaking to the inside of the gas turbine is prevented from deflagrating when the unit is started, the fuel regulating pipeline is isolated through the valve, the pipeline isolated between the valves is provided with the evacuation valve to evacuate, and the natural gas is guaranteed not to leak to the gas turbine body. As shown in fig. 1, in order to ensure the evacuation effect of each section of pipeline, taking a ge9f.05 combustion engine as an example, 4 groups of evacuation valves are provided, and in the operation process of the unit, an event that the unit trips due to the incorrect opening of the evacuation valves occurs many times, so that the unit is hidden in safe and stable operation.
Therefore, it is necessary to provide a leakage-preventing system for the nitrogen-filled gas resistance of the natural gas regulating pipeline of the gas turbine, which uses high-pressure nitrogen to punch the pipeline between the natural gas pipeline valve groups to form a gas resistance, prevents natural gas leakage, reduces the number of the emptying valves, and reduces the risk of tripping of the emptying valve malfunction unit, so as to solve the technical problems.
Disclosure of Invention
In order to solve the technical problem, the invention provides a nitrogen-filling air-resistance leakage-preventing system for a natural gas adjusting pipeline of a gas turbine.
The invention provides a nitrogen-filling air-resistance leakage-preventing system for a natural gas regulating pipeline of a gas turbine, which comprises a fuel pipeline, a shunt pipe, a gas turbine body and a fuel regulating valve, wherein the fuel pipeline is communicated with the shunt pipe, the shunt pipe is communicated with a fuel inlet of the gas turbine body, the fuel regulating valves are respectively fixed on a plurality of branch pipes of the shunt pipe, a safety shut-off valve is fixed at one end of the fuel pipeline far away from the gas turbine body, a speed ratio valve is fixed at one end of the fuel pipeline close to the gas turbine body, an auxiliary stop valve is fixed between the speed ratio valve and the safety shut-off valve of the fuel pipeline, a nitrogen filling pipe is fixedly communicated between the auxiliary stop valve and the speed ratio valve of the fuel pipeline, the fuel pipeline is fixedly communicated with an emptying pipe between the safety shut-off valve and the auxiliary stop valve, a nitrogen filling valve is fixed at one end of the nitrogen filling pipe, and an emptying valve is fixed at one end of the emptying pipe.
Preferably, the auxiliary stop valve includes a communicating pipe, a one-way valve, a spool, a limit ring, a limit mechanism, a trigger mechanism and a switch mechanism, the communicating pipe is fixed between the speed ratio valve and the safety shut-off valve of the fuel pipeline, the one-way valve is fixed in the middle of the communicating pipe, the spool is connected to one end of the inner wall of the fuel pipeline in a sliding manner, the limit ring is fixed to one end of the fuel pipeline close to the spool, the limit mechanism is fixed to one end of the top of the fuel pipeline close to the communicating pipe, the trigger mechanism is fixed to the movable end of the limit mechanism, and the switch mechanism is fixed to one end of the fuel pipeline close to the limit mechanism.
Preferably, the limiting mechanism comprises a driving shell, a first threaded rod, a first bevel gear, a first motor, a second bevel gear, a sliding block and an L-shaped rod, the driving shell is fixed at one end, close to the communicating pipe, of the top of the fuel pipeline, the bottom of the driving shell is communicated with the fuel pipeline, the inner wall of the driving shell is rotatably connected with the first threaded rod through a bearing, the first bevel gear is fixed at one end of the first threaded rod, the first motor is fixed at the top of one end, close to the first bevel gear, of the inner wall of the driving shell, the second bevel gear is fixed at the output end of the first motor, the first bevel gear is meshed with the second bevel gear, the sliding block is connected to the inner wall of the driving shell in a sliding mode, the sliding block is in threaded connection with the first threaded rod through a threaded hole, and the L-shaped rod is fixed at the bottom of the sliding block.
Preferably, the trigger mechanism includes stopper, first spout, fore-set, dovetail groove, second spout, ejector pin and extension spring, L shape pole one end is fixed with the stopper piece, and the stopper top be with fuel pipe inner wall matched with arc setting, stopper top and fuel pipe inner wall sliding connection, first spout has been seted up at the stopper middle part, first spout inner wall sliding connection has the fore-set, the dovetail groove has been seted up to the fore-set lower extreme, the second spout has been seted up to first spout inner wall lower extreme, second spout inner wall sliding connection has the ejector pin, the ejector pin tip is equipped with the chamfer, and ejector pin and dovetail groove inner wall sliding connection, chamfer face on the ejector pin and the inclined plane sliding connection in dovetail groove, first spout inner wall is fixed with the extension spring, and extension spring and fore-set bottom fixed connection.
Preferably, the on-off mechanism includes a switch section of thick bamboo, first traveller, second traveller, backup pad, mounting panel, micro-gap switch and second spring, the one end that the fuel conduit is close to the stopper is fixed with a switch section of thick bamboo, the sliding lower extreme sliding connection of switch section of thick bamboo inner wall has first traveller, first traveller and fore-set top contact, first traveller top is fixed with the second traveller, switch section of thick bamboo top symmetry is fixed with the backup pad, two the backup pad top is fixed with the mounting panel, mounting panel lower surface mounting has micro-gap switch, the second traveller top passes switch section of thick bamboo top and micro-gap switch contact through the through-hole, second traveller outside cover is equipped with the second spring, second spring one end and first traveller fixed connection, and the second spring other end and switch section of thick bamboo inner wall fixed connection.
Preferably, a connecting pipe is fixed at the lower end of the nitrogen filling pipe, and a buffer mechanism is fixed at the top of the connecting pipe.
Preferably, buffer gear includes buffer tank, piston plate, third spring, regulating plate, internal thread sleeve, second threaded rod, gag lever post and air-vent valve, the fixed intercommunication in connecting pipe top has the buffer tank, buffer tank inner wall sliding connection has the piston plate, piston plate top is fixed with the third spring, third spring top is fixed with the regulating plate, the buffer tank top is rotated through the bearing and is connected with the internal thread sleeve, internal thread sleeve inner wall threaded connection has the second threaded rod, second threaded rod bottom and regulating plate fixed connection, regulating plate top one end is fixed with the gag lever post, the gag lever post passes through slide opening and buffer tank top sliding connection, it is fixed with the air-vent valve to fill nitrogen pipe lower extreme.
Preferably, the buffer tank top is fixed with the U-shaped board, the U-shaped board top is fixed with the second motor, the output of second motor is fixed with first gear, the internal thread sleeve outside is fixed with the ring gear, and first gear is connected with the ring gear meshing.
Preferably, the first motor and the second motor are both a reduction motor.
Preferably, the fuel pipeline is located between the safety shut-off valve and the auxiliary shut-off valve and is a first pressure area, the fuel pipeline is located between the auxiliary shut-off valve and the speed ratio valve and is a second pressure area, and two ends of the communicating pipe are respectively communicated with the first pressure area and the second pressure area.
Compared with the related art, the gas turbine natural gas adjusting pipeline nitrogen filling and gas resistance leakage preventing system provided by the invention has the following beneficial effects:
the invention provides a nitrogen-filling air-resistance leakage-preventing system for a natural gas adjusting pipeline of a gas turbine, which comprises the following steps:
1. when the gas turbine is used, after the gas turbine body is stopped, the safety shut-off valve and the fuel regulating valve are automatically closed, the auxiliary stop valve and the speed ratio valve are kept in an open state, the emptying valve is opened to empty natural gas in the fuel pipeline, when the first pressure area and the second pressure area are reduced to the atmospheric pressure, the emptying valve is closed, the nitrogen charging valve is automatically opened, and the nitrogen charging valve is closed when the pressure of the second pressure area is increased to 0.5 MPa; if the pressure of the first pressure area is increased due to internal leakage of the safety shut-off valve in the pressure maintaining process, the nitrogen charging valve automatically opens the nitrogen charging valve, and the pressure of the second pressure area is always kept to be 0.5MPa higher than the pressure of the first pressure area, so that a pipeline between the auxiliary stop valve and the speed ratio valve forms a gas barrier, natural gas is prevented from leaking to the gas turbine body, the number of the emptying valves is reduced to a group, and the risk of tripping of a misoperation unit is greatly reduced;
2. when the gas turbine body runs, the limiting block is driven by the limiting mechanism to move towards one end of the gas turbine body, so that when gas is introduced into the fuel pipeline, the gas pushes the valve column to slide, one end of the valve column is limited by the limiting block, the other end of the valve column is separated from the communicating pipe, the gas is conveyed to the other end of the fuel pipeline through the communicating pipe and then enters the flow dividing pipe to be used in the gas turbine body, after the gas turbine body stops running, the limiting block is driven by the limiting mechanism to move towards one end far away from the gas turbine body after the gas in the fuel pipeline is emptied, the top of the limiting block is aligned with the switch mechanism, the distance between the limiting block and the limiting ring is shortened, the movable range of the valve column in the fuel pipeline is reduced, the valve column can always plug one end of the communicating pipe to close the communicating pipe, and then the second pressure area is filled with nitrogen, because the pressure in the fuel pipeline is increased, the nitrogen pushes the valve post to slide towards one end of the limiting ring, if the gas leaks, the pressure in the first pressure area is greater than the pressure in the second pressure area, the gas pushes the valve post to slide towards one end of the limiting block, the valve post pushes the ejector rod, the ejector rod pushes the trapezoidal groove of the ejector post to drive the ejector post to push upwards, the top of the ejector post pushes the first sliding post to push the first sliding post upwards, the first sliding post drives the second sliding post to slide upwards, and the second sliding post pushes the microswitch, at the moment, the pressure regulating valve is controlled to be opened, so that the connecting pipe is communicated with the nitrogen filling pipe, the third spring pushes the piston plate to slide downwards, the pressure stored in the buffer tank is released into the fuel pipeline, the pressure in the second pressure area is increased, the frequent starting of the nitrogen filling pump is avoided, the energy consumption is reduced, and the pressure is detected through a mechanical structure, the reliability is high;
3. at filling the nitrogen in-process, nitrogen pressure passes through in the connecting pipe gets into the buffer tank, and extrude the piston board, make the piston board extrusion third spring hold power, then people are closing the air-vent valve, the stored energy, rotate through the second motor and drive first gear and ring gear and rotate, and then can drive the internal thread sleeve and rotate, make the internal thread sleeve drive the second threaded rod and go up and down, and then can drive regulating plate extrusion third spring, thereby the pressure in the adjustable buffer tank, so that adapt to the different pressure condition:
4. when the fuel pipeline inputs fuel to the gas turbine body, the pressure fluctuation of the fuel gas can be buffered through the buffer mechanism, and the stability is improved.
Drawings
FIG. 1 is a prior art system diagram;
FIG. 2 is a system diagram provided by the present invention;
FIG. 3 is a schematic structural diagram of an auxiliary stop valve provided by the present invention;
FIG. 4 is a schematic diagram of the internal structure of a fuel pipeline provided by the present invention;
FIG. 5 is a schematic structural view of a limiting mechanism provided in the present invention;
FIG. 6 is a schematic structural diagram of a switch mechanism provided in the present invention;
FIG. 7 is a schematic structural view of an actuating mechanism provided in the present invention;
FIG. 8 is a schematic structural view of a cushion mechanism provided in the present invention;
FIG. 9 is a schematic view of the internal structure of the cushioning mechanism provided in the present invention;
fig. 10 is a schematic structural view of a third spring provided in the present invention.
Reference numbers in the figures: 1. a fuel conduit; 2. a shunt tube; 3. a combustion engine body; 4. a fuel regulating valve; 5. a safety shut-off valve; 6. a speed ratio valve; 7. an auxiliary stop valve; 71. a communicating pipe; 72. a one-way valve; 73. a spool; 74. a limiting ring; 75. a limiting mechanism; 751. a drive case; 752. a first threaded rod; 753. a first bevel gear; 754. a first motor; 755. a second bevel gear; 756. a slider; 757. an L-shaped rod; 76. a trigger mechanism; 761. a limiting block; 762. a first chute; 763. a top pillar; 764. a trapezoidal groove; 765. a second chute; 766. a top rod; 767. a tension spring; 77. a switch mechanism; 771. a switch cylinder; 772. a first traveler; 773. a second strut; 774. a support plate; 775. mounting a plate; 776. a microswitch; 777. a second spring; 8. a nitrogen charging pipe; 9. emptying the pipe; 10. a nitrogen charging valve; 11. an evacuation valve; 12. a connecting pipe; 13. a buffer mechanism; 131. a buffer tank; 132. a piston plate; 133. a third spring; 134. an adjusting plate; 135. an internally threaded sleeve; 136. a second threaded rod; 137. a limiting rod; 138. a pressure regulating valve; 139. a U-shaped plate; 1310. a second motor; 1311. a first gear; 1312. a gear ring; 14. a first pressure zone; 15. a second pressure zone.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
In a specific implementation process, as shown in fig. 2, 3 and 4, a natural gas regulating pipeline nitrogen-filling gas-blocking leakage-preventing system for a gas turbine comprises a fuel pipeline 1, a shunt pipe 2, a gas turbine body 3 and a fuel regulating valve 4, wherein the fuel pipeline 1 is communicated with the shunt pipe 2, the shunt pipe 2 is communicated with a fuel inlet of the gas turbine body 3, the fuel regulating valve 4 is respectively fixed on a plurality of branch pipes of the shunt pipe 2, a safety shut-off valve 5 is fixed at one end of the fuel pipeline 1 away from the gas turbine body 3, a speed ratio valve 6 is fixed at one end of the fuel pipeline 1 close to the gas turbine body 3, an auxiliary shut-off valve 7 is fixed between the speed ratio valve 6 and the safety shut-off valve 5 and is positioned on the fuel pipeline 1, a nitrogen-filling pipe 8 is fixed between the auxiliary shut-off valve 7 and the speed ratio valve 6 and a vent pipe 9 is fixed between the safety shut-off valve 5 and the auxiliary shut-off valve 7 and is positioned on the fuel pipeline 1, a nitrogen charging valve 10 is fixed at one end of the nitrogen charging pipe 8, an exhaust valve 11 is fixed at one end of the exhaust pipe 9, a first pressure area 14 is formed between the fuel pipeline 1 and the safety shut-off valve 5 and the auxiliary shut-off valve 7, a second pressure area 15 is formed between the fuel pipeline 1 and the auxiliary shut-off valve 7 and the speed ratio valve 6, and two ends of the communicating pipe 71 are respectively communicated with the first pressure area 14 and the second pressure area 15;
it should be noted that, after the gas turbine body 3 is shut down, the safety shut-off valve 5 and the fuel regulating valve 4 are automatically closed, the auxiliary shut-off valve 7 and the speed ratio valve 6 are kept in an open state, the evacuation valve 11 is opened to evacuate natural gas in the fuel pipeline 1, when the first pressure area 14 and the second pressure area 15 are reduced to atmospheric pressure, the evacuation valve 11 is closed, the nitrogen charging valve 10 is automatically opened, and the nitrogen charging valve 10 is closed when the pressure of the second pressure area 15 is increased to 0.5 MPa; if the pressure of the first pressure area 14 is increased due to the internal leakage of the safety shutoff valve 5 in the pressure maintaining process, the nitrogen charging valve 10 automatically opens the nitrogen charging, and the pressure of the second pressure area 15 is always kept to be 0.5MPa higher than the pressure of the first pressure area 14. Therefore, air resistance is formed between the auxiliary stop valve 7 and the speed ratio valve 6 through pipelines, natural gas is prevented from leaking to the gas turbine body 3, the number of the emptying valves 11 is reduced to 1 group, and the risk of tripping of a malfunction unit is greatly reduced.
Referring to fig. 3 and 4, the auxiliary stop valve 7 includes a communication pipe 71, a one-way valve 72, a spool 73, a limit ring 74, a limit mechanism 75, a trigger mechanism 76, and a switch mechanism 77, the communication pipe 71 is fixed between the speed ratio valve 6 and the safety shut-off valve 5 of the fuel pipeline 1, the one-way valve 72 is fixed in the middle of the communication pipe 71, the spool 73 is slidably connected to one end of the inner wall of the fuel pipeline 1, the limit ring 74 is fixed to one end of the fuel pipeline 1 close to the spool 73, the limit mechanism 75 is fixed to one end of the top of the fuel pipeline 1 close to the communication pipe 71, the trigger mechanism 76 is fixed to the movable end of the limit mechanism 75, and the switch mechanism 77 is fixed to one end of the fuel pipeline 1 close to the limit mechanism 75;
it should be noted that, when the combustion engine body 3 is running, the limiting block 761 is driven by the limiting mechanism 75 to move towards one end of the combustion engine body 3, so that when gas is introduced into the fuel pipeline 1, the gas pushes the valve post 73 to slide, so that one end of the valve post 73 is limited by the limiting block 761, so that the other end of the valve post 73 is separated from the communicating pipe 71, the gas is conveyed to the other end of the fuel pipeline 1 through the communicating pipe 71, and then enters the shunt pipe 2 to be used in the combustion engine body 3, after the combustion engine body 3 stops running, the gas in the fuel pipeline 1 is emptied, the limiting block 761 is driven by the limiting mechanism 75 to move towards one end far away from the combustion engine body 3, and the top of the limiting block 761 is aligned with the switch mechanism 77, so that the distance between the limiting block 761 and the limiting ring 74 is shortened, so that the movable range of the valve post 73 in the fuel pipeline 1 is reduced, and one end of the communicating pipe 71 is always blocked by the valve post 73, the communicating pipe 71 is closed, at this time, the second pressure area 15 is filled with nitrogen again, in the nitrogen filling process, nitrogen pressure enters the buffer tank 131 through the connecting pipe 12, and presses the piston plate 132, so that the piston plate 132 presses the third spring 133 to accumulate force, then people close the pressure regulating valve 138, store energy, and due to the increase of pressure in the fuel pipeline 1, the nitrogen pushes the valve post 73 to slide towards one end of the limit ring 74, if gas leaks, the pressure of the first pressure area 14 is greater than the pressure of the second pressure area 15, so that the gas pushes the valve post 73 to slide towards one end of the limit block 761, so that the valve post 73 presses the ejector rob 766, so that the ejector rob 766 pushes the trapezoidal groove 764 of the ejector rob 763, so as to drive the ejector rob 763 to push upwards, so that the top of the ejector rob 763 pushes the first sliding column, so that the first sliding column drives the second sliding column 773 to slide upwards, and so that the second sliding column 773 pushes the microswitch 776, at this time, the pressure regulating valve 138 is controlled to be opened, so that the connecting pipe 12 is communicated with the nitrogen charging pipe 8, and the third spring 133 presses the piston plate 132 to slide downwards, thereby releasing the pressure stored in the buffer tank 131 into the fuel pipeline 1, increasing the pressure of the second pressure region 15, avoiding frequent start of the nitrogen charging pump, and reducing energy consumption.
Referring to fig. 5, the limiting mechanism 75 includes a driving shell 751, a first threaded rod 752, a first bevel gear 753, a first motor 754, a second bevel gear 755, a slider 756, and an L-shaped rod 757, wherein the driving shell 751 is fixed at one end of the top of the fuel pipeline 1 close to the communicating pipe 71, the bottom of the driving shell 751 is communicated with the fuel pipeline 1, the first threaded rod 752 is rotatably connected to the inner wall of the driving shell 751 through a bearing, the first bevel gear 753 is fixed at one end of the first threaded rod 752, the first motor 754 is fixed at the top of the inner wall of the driving shell 751 close to the first bevel gear 753, the second bevel gear 755 is fixed at the output end of the first motor 754, the first bevel gear 753 is engaged with the second bevel gear 755, the slider 756 is slidably connected to the inner wall of the driving shell, the slider 756 is threadedly connected to the first threaded rod 752 through a threaded hole, the L-shaped rod 757 is fixed at the bottom of the slider 756, the first bevel gear 753 is driven to rotate by the first motor 754, and the first threaded rod 752 is driven to rotate by the second bevel gear 755, so that the first threaded rod 752 drives the slider 756 to slide, and the slider 756 drives the L-shaped rod 757 to slide.
Referring to fig. 5 and 7, the triggering mechanism 76 includes a limiting block 761, a first sliding slot 762, a top post 763, a trapezoidal groove 764, a second sliding slot 765, a push rod 766 and a tension spring 767, wherein one end of the L-shaped rod 757 is fixed with the limiting block 761, the top of the limiting block 761 is in an arc shape matching with the inner wall of the fuel pipeline 1, the top of the limiting block 761 is slidably connected with the inner wall of the fuel pipeline 1, the middle of the limiting block 761 is provided with the first sliding slot 762, the inner wall of the first sliding slot 762 is slidably connected with the top post 763, the lower end of the top post 763 is provided with the trapezoidal groove 764, the lower end of the inner wall of the first sliding slot 762 is provided with the second sliding slot 765, the inner wall of the second sliding slot 765 is slidably connected with the push rod 766, the end of the push rod 766 is provided with a chamfer, the push rod 766 is slidably connected with the inner wall of the trapezoidal groove 764, the chamfer surface of the push rod 766 is slidably connected with the inclined surface of the trapezoidal groove 764, the inner wall of the first sliding slot 767 is fixed with the tension spring 762, and the tension spring 767 is fixedly connected with the bottom of the top column 763;
referring to fig. 5 and 6, the switch mechanism 77 includes a switch barrel 771, a first spool 772, a second spool 773, a support plate 774, a mounting plate 775, a microswitch 776 and a second spring 777, the switch barrel 771 is fixed at one end of the fuel pipeline 1 close to a limit block 761, the first spool 772 is connected to the sliding lower end of the inner wall of the switch barrel 771 in a sliding manner, the first spool 772 contacts with the top of the top post 763, the second spool 773 is fixed at the top of the first spool 772, the support plates 774 are symmetrically fixed at the top of the switch barrel 771, the mounting plates 775 are fixed at the tops of the two support plates 774, the microswitch 776 is fixed at the lower surface of the mounting plate 775, the second spool 773 is connected with the microswitch 776 by passing through a through hole through the top of the switch barrel 771, the second spring 777 is sleeved at the outer side of the second spool 777, one end of the second spring 777 is fixedly connected with the first spool 772, the other end of the second spring 777 is fixedly connected with the inner wall of the switch barrel 771;
the spool 73 slides to the one end of stopper 761 for spool 73 extrudes ejector pin 766, makes ejector pin 766 push up the dovetail groove 764 of fore-set 763, drives the fore-set 763 and pushes up, makes the fore-set 763 top push up first traveller 772, makes first traveller 772 upwards drive second traveller 773 and slides, thereby makes second traveller 773 push up micro-gap switch 776.
Referring to fig. 3, 8, 9 and 10, the lower end of the nitrogen charging pipe 8 is fixed with a connecting pipe 12, the top of the connecting pipe 12 is fixed with a buffer mechanism 13, the buffer mechanism 13 includes a buffer tank 131, a piston plate 132, a third spring 133, an adjusting plate 134, an internal thread sleeve 135, a second threaded rod 136, a limiting rod 137 and a pressure regulating valve 138, the top of the connecting pipe 12 is fixedly communicated with the buffer tank 131, the inner wall of the buffer tank 131 is slidably connected with the piston plate 132, the top of the piston plate 132 is fixed with the third spring 133, the top of the third spring 133 is fixed with the adjusting plate 134, the top of the buffer tank 131 is rotatably connected with the internal thread sleeve 135 through a bearing, the inner wall of the internal thread sleeve 135 is threadedly connected with the second threaded rod 136, the bottom of the second threaded rod 136 is fixedly connected with the adjusting plate 134, one end of the top of the adjusting plate 134 is fixed with the limiting rod 137, the limiting rod 137 is connected with the top of the buffer tank 131 in a sliding mode through a sliding hole, the lower end of the nitrogen charging pipe 8 is fixed with the pressure regulating valve 138, the top of the buffer tank 131 is fixed with a U-shaped plate 139, the top of the U-shaped plate 139 is fixed with a second motor 1310, the output end of the second motor 1310 is fixed with a first gear 1311, the outer side of the internal thread sleeve 135 is fixed with a gear ring 1312, the first gear 1311 is connected with the gear ring 1312 in a meshing mode, and the first motor 754 and the second motor 1310 are both speed reducing motors.
The working principle is as follows:
when the gas turbine is used, after the gas turbine body 3 is stopped, the safety shut-off valve 5 and the fuel regulating valve 4 are automatically closed, the auxiliary shut-off valve 7 and the speed ratio valve 6 are kept in an open state, the evacuation valve 11 is opened to evacuate natural gas in the fuel pipeline 1, when the first pressure area 14 and the second pressure area 15 are reduced to the atmospheric pressure, the evacuation valve 11 is closed, the nitrogen charging valve 10 is automatically opened, and the nitrogen charging valve 10 is closed when the pressure of the second pressure area 15 is increased to 0.5 MPa; if the pressure of the first pressure area 14 is increased due to the internal leakage of the safety shutoff valve 5 in the pressure maintaining process, the nitrogen charging valve 10 automatically opens the nitrogen charging, and the pressure of the second pressure area 15 is always kept to be 0.5MPa higher than the pressure of the first pressure area 14. Therefore, air resistance is formed between the auxiliary stop valve 7 and the speed ratio valve 6 through pipelines, natural gas is prevented from leaking to the gas turbine body 3, the number of the emptying valves 11 is reduced to 1 group, and the risk of tripping of a malfunction unit is greatly reduced;
when the gas turbine body 3 runs, the first bevel gear 753 is driven to rotate by the first motor 754, and then the first threaded rod 752 is driven to rotate by the second bevel gear 755, so that the first threaded rod 752 drives the slider 756 to slide, the slider 756 drives the limit block 761 on the L-shaped rod 757 to move towards one end of the gas turbine body 3, when gas is introduced into the fuel pipeline 1, the gas pushes the valve column 73 to slide, so that one end of the valve column 73 is limited by the limit block 761, the other end of the valve column 73 is separated from the communicating pipe 71, the gas is conveyed to the other end of the fuel pipeline 1 through the communicating pipe 71 and then enters the shunt pipe 2 to be used in the gas turbine body 3, when the gas turbine body 3 stops running, after the gas in the fuel pipeline 1 is emptied, the limit block 761 is driven by the limit mechanism 75 to move towards one end far away from the gas turbine body 3, and the top of the limit block 761 is aligned with the switch mechanism 77, the distance between the limiting block 761 and the limiting ring 74 is shortened, so that the movable range of the valve post 73 in the fuel pipeline 1 is reduced, the valve post 73 always plugs one end of the communicating pipe 71 to close the communicating pipe 71, at this time, the second pressure area 15 is filled with nitrogen, during the nitrogen filling process, the nitrogen pressure enters the buffer tank 131 through the connecting pipe 12 and presses the piston plate 132, so that the piston plate 132 presses the third spring 133 to accumulate force, then people close the pressure regulating valve 138 to store energy, the pressure in the fuel pipeline 1 is increased due to the pressure, so that the nitrogen pushes the valve post 73 to slide towards one end of the limiting ring 74, if gas leaks, the pressure of the first pressure area 14 is greater than the pressure of the second pressure area 15, so that the gas pushes the valve post 73 to slide towards one end of the limiting block 761, so that the valve post 73 pushes the push rod 766, and the push rod 766 pushes the trapezoidal groove 764 of the push rod 763, the jacking column 763 is driven to jack upwards, so that the top of the jacking column 763 jacks the first sliding column 772, the first sliding column 772 jacks the second sliding column 773 to slide, the second sliding column 773 jacks the microswitch 776, at the moment, the pressure regulating valve 138 is controlled to be opened, the connecting pipe 12 is communicated with the nitrogen charging pipe 8, the third spring 133 extrudes the piston plate 132 to slide downwards, the pressure stored in the buffer tank 131 is released into the fuel pipeline 1, the pressure of the second pressure area 15 is increased, frequent starting of the nitrogen charging pump is avoided, and energy consumption is reduced;
the second motor 1310 rotates to drive the first gear 1311 and the gear ring 1312 to rotate, so that the internal threaded sleeve 135 can be driven to rotate, the internal threaded sleeve 135 drives the second threaded rod 136 to lift, the adjusting plate 134 can be driven to extrude the third spring 133, and therefore the pressure in the buffer tank 131 can be adjusted, and different pressure conditions can be adapted conveniently;
when the fuel pipeline 1 inputs fuel to the engine body 3, the pressure fluctuation of the fuel gas can be buffered through the buffer mechanism 13, and the stability is improved.
The circuits and controls involved in the present invention are prior art and will not be described in detail herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A natural gas regulating pipeline nitrogen-filled air-resistance leakage-preventing system of a gas turbine comprises a fuel pipeline (1), a shunt pipe (2), a gas turbine body (3) and a fuel regulating valve (4), wherein the fuel pipeline (1) is communicated with the shunt pipe (2), the shunt pipe (2) is communicated with a fuel inlet of the gas turbine body (3), the fuel regulating valve (4) is respectively fixed on a plurality of branch pipes of the shunt pipe (2), the natural gas regulating pipeline is characterized in that one end, far away from the gas turbine body (3), of the fuel pipeline (1) is fixedly provided with a safety shut-off valve (5), one end, close to the gas turbine body (3), of the fuel pipeline (1) is fixedly provided with a speed ratio valve (6), an auxiliary stop valve (7) is fixed between the speed ratio valve (6) and the safety shut-off valve (5), a nitrogen-filled pipe (8) is fixed between the auxiliary stop valve (7) and the speed ratio valve (6) of the fuel pipeline (1), the fuel pipeline (1) is located between the safety shut-off valve (5) and the auxiliary stop valve (7) and is fixedly communicated with an emptying pipe (9), one end of the nitrogen filling pipe (8) is fixedly provided with a nitrogen filling valve (10), and one end of the emptying pipe (9) is fixedly provided with an emptying valve (11).
2. The gas turbine natural gas adjusting pipeline nitrogen-filling gas-resistance leakage-preventing system according to claim 1, wherein the auxiliary stop valve (7) comprises a communicating pipe (71), a one-way valve (72), a valve column (73), a limiting ring (74), a limiting mechanism (75), a triggering mechanism (76) and a switch mechanism (77), the communicating pipe (71) is fixed between the speed ratio valve (6) and the safety shut-off valve (5) of the fuel pipeline (1), the one-way valve (72) is fixed in the middle of the communicating pipe (71), the valve column (73) is connected to one end of the inner wall of the fuel pipeline (1) in a sliding manner, the limiting ring (74) is fixed to one end of the fuel pipeline (1) close to the valve column (73), the limiting mechanism (75) is fixed to one end of the top of the fuel pipeline (1) close to the communicating pipe (71), and the triggering mechanism (76) is fixed to the movable end of the limiting mechanism (75), and a switch mechanism (77) is fixed at one end of the fuel pipeline (1) close to the limiting mechanism (75).
3. The gas turbine natural gas adjusting pipeline nitrogen-filled air-resistance leakage-preventing system as claimed in claim 2, wherein the limiting mechanism (75) comprises a driving shell (751), a first threaded rod (752), a first bevel gear (753), a first motor (754), a second bevel gear (755), a slider (756) and an L-shaped rod (757), one end of the top of the fuel pipeline (1) close to the communicating pipe (71) is fixed with the driving shell (751), the bottom of the driving shell (751) is communicated with the fuel pipeline (1), the inner wall of the driving shell (751) is rotatably connected with the first threaded rod (752) through a bearing, one end of the first threaded rod (752) is fixed with the first bevel gear (753), one end of the inner wall of the driving shell (751) close to the first bevel gear (753) is fixed with the first motor (754), and the output end of the first motor (754) is fixed with the second bevel gear (755), and the first bevel gear (753) is in meshed connection with the second bevel gear (755), the inner wall of the driving shell (751) is connected with a sliding block (756) in a sliding mode, the sliding block (756) is in threaded connection with the first threaded rod (752) through a threaded hole, and an L-shaped rod (757) is fixed at the bottom of the sliding block (756).
4. The gas turbine natural gas regulating pipeline nitrogen-filling air-resistance leakage-preventing system according to claim 3, wherein the trigger mechanism (76) comprises a limiting block (761), a first sliding groove (762), a top pillar (763), a trapezoidal groove (764), a second sliding groove (765), a top rod (766) and a tension spring (767), a limiting block (761) is fixed at one end of the L-shaped rod (757), the top of the limiting block (761) is in an arc shape matched with the inner wall of the fuel pipeline (1), the top of the limiting block (761) is in sliding connection with the inner wall of the fuel pipeline (1), the middle of the limiting block (761) is provided with the first sliding groove (762), the inner wall of the first sliding groove (762) is in sliding connection with the top pillar (763), the lower end of the top pillar (763) is provided with the trapezoidal groove (764), the lower end of the inner wall of the first sliding groove (762) is provided with the second sliding groove (765), second spout (765) inner wall sliding connection has ejector pin (766), ejector pin (766) tip is equipped with the chamfer, and ejector pin (766) and dovetail groove (764) inner wall sliding connection, chamfer face and the inclined plane sliding connection in dovetail groove (764) on ejector pin (766), first spout (762) inner wall is fixed with extension spring (767), and extension spring (767) and fore-set (763) bottom fixed connection.
5. The gas turbine natural gas adjusting pipeline nitrogen-filled gas-resistance leakage-preventing system according to claim 4, wherein the switch mechanism (77) comprises a switch barrel (771), a first sliding column (772), a second sliding column (773), a supporting plate (774), a mounting plate (775), a microswitch (776) and a second spring (777), one end of the fuel pipeline (1) close to the limit block (761) is fixedly provided with the switch barrel (771), the sliding lower end of the inner wall of the switch barrel (771) is connected with the first sliding column (772) in a sliding mode, the first sliding column (772) is in contact with the top of the top column (763), the second sliding column (773) is fixed on the top of the first sliding column (772), the supporting plate (774) is symmetrically fixed on the top of the switch barrel (771), the mounting plate (775) is fixed on the tops of the two supporting plates (774), and the microswitch (776) is fixed on the lower surface of the mounting plate (775), the top of the second sliding column (773) penetrates through the top of the switch barrel (771) through a through hole to be in contact with the microswitch (776), a second spring (777) is sleeved on the outer side of the second sliding column (773), one end of the second spring (777) is fixedly connected with the first sliding column (772), and the other end of the second spring (777) is fixedly connected with the inner wall of the switch barrel (771).
6. The gas turbine natural gas regulating pipeline nitrogen-filling gas-resistance leakage-preventing system according to claim 3, wherein a connecting pipe (12) is fixed at the lower end of the nitrogen-filling pipe (8), and a buffering mechanism (13) is fixed at the top of the connecting pipe (12).
7. The gas turbine natural gas adjusting pipeline nitrogen-filled gas-resistance leakage-preventing system according to claim 6, wherein the buffering mechanism (13) comprises a buffering tank (131), a piston plate (132), a third spring (133), an adjusting plate (134), an internal threaded sleeve (135), a second threaded rod (136), a limiting rod (137) and a pressure regulating valve (138), the buffering tank (131) is fixedly communicated with the top of the connecting pipe (12), the piston plate (132) is slidably connected with the inner wall of the buffering tank (131), the third spring (133) is fixedly arranged on the top of the piston plate (132), the adjusting plate (134) is fixedly arranged on the top of the third spring (133), the internal threaded sleeve (135) is rotatably connected with the top of the buffering tank (131) through a bearing, the second threaded rod (136) is connected with the inner wall of the internal threaded sleeve (135) in a threaded manner, and the bottom of the second threaded rod (136) is fixedly connected with the adjusting plate (134), a limiting rod (137) is fixed to one end of the top of the adjusting plate (134), the limiting rod (137) is connected with the top of the buffer tank (131) in a sliding mode through a sliding hole, and a pressure adjusting valve (138) is fixed to the lower end of the nitrogen charging pipe (8).
8. The gas turbine natural gas conditioning pipeline nitrogen-filled gas-resistance leakage-prevention system according to claim 7, characterized in that a U-shaped plate (139) is fixed on the top of the buffer tank (131), a second motor (1310) is fixed on the top of the U-shaped plate (139), a first gear (1311) is fixed on the output end of the second motor (1310), a gear ring (1312) is fixed on the outer side of the internally threaded sleeve (135), and the first gear (1311) is in meshed connection with the gear ring (1312).
9. The gas turbine natural gas conditioning pipe nitrogen filled vapor lock leakage prevention system of claim 8, wherein said first motor (754) and said second motor (1310) are each a speed reduction motor.
10. The gas turbine natural gas regulating pipeline nitrogen-filling gas-resistance leakage-preventing system according to claim 1, wherein a first pressure area (14) is formed between the safety shut-off valve (5) and the auxiliary shut-off valve (7) of the fuel pipeline (1), a second pressure area (15) is formed between the auxiliary shut-off valve (7) and the speed ratio valve (6) of the fuel pipeline (1), and two ends of the communicating pipe (71) are respectively communicated with the first pressure area (14) and the second pressure area (15).
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| CN117346982A (en) * | 2023-12-05 | 2024-01-05 | 西南石油大学 | Buried ball valve internal leakage detection device and method |
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| CN114017185B (en) | 2022-11-29 |
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