CN114017185B - 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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- CN114017185B CN114017185B CN202111180309.XA CN202111180309A CN114017185B CN 114017185 B CN114017185 B CN 114017185B CN 202111180309 A CN202111180309 A CN 202111180309A CN 114017185 B CN114017185 B CN 114017185B
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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 a nitrogen charging pump to work, reduce energy consumption, and also 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 detonated when the unit is started, the fuel regulating pipeline is isolated through the valve, the pipeline isolated between the valves is provided with the emptying valve for emptying, 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-blocking 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 valve is 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, which is far away from the gas turbine body, a speed ratio valve is fixed at one end of the fuel pipeline, which is close to the gas turbine body, an auxiliary stop valve is fixed between the speed ratio valve and the safety shut-off valve, a nitrogen filling pipe is fixed between the auxiliary stop valve and the speed ratio valve, a discharge pipe is fixed 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 exhaust valve is fixed at one end of the discharge 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 slider and an L-shaped rod, the driving shell is fixed at one end of the top of the fuel pipeline close to the communicating pipe, 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 of the inner wall of the driving shell close to the first bevel gear, 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 slider is slidably connected with the inner wall of the driving shell, the slider 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 slider.
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 pipe 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 the contact of fore-set top, 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 fixed 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 the nitrogen pipe lower extreme.
Preferably, a U-shaped plate is fixed to the top of the buffer tank, a second motor is fixed to the top of the U-shaped plate, a first gear is fixed to the output end of the second motor, a gear ring is fixed to the outer side of the internal thread sleeve, and the first gear is meshed with the gear ring.
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-filled air-blocking leakage-proof system of 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 shut-off valve and the speed ratio valve are kept in an open state, the emptying valve is opened to empty natural gas in a fuel pipeline, the emptying valve is closed after a first pressure area and a second pressure area are reduced to atmospheric pressure, 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 the 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 greater than the pressure of the first pressure area, so that a gas barrier is formed between the auxiliary stop valve and the speed ratio valve, natural gas is prevented from leaking to the gas turbine body, the number of the emptying valves is reduced to the number of the emptying valves, and the risk of tripping operation 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 cushion jar, and extrude the piston board, make piston board extrusion third spring hold power, then people are closing the air-vent valve, the stored energy, it rotates to drive first gear and ring gear through the second motor, 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 pressure in the adjustable cushion jar, so that adapt to different pressure conditions:
4. when the fuel pipeline inputs fuel to the combustion engine 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 channel provided by the present invention;
FIG. 5 is a schematic view of a limiting mechanism according to the present invention;
FIG. 6 is a schematic structural diagram of a switch mechanism provided by 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 diagram of a buffering 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 according to 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 filling 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 below with reference to the drawings and the embodiments.
In a specific implementation process, as shown in fig. 2, 3 and 4, a gas turbine natural gas regulating pipeline nitrogen-filled gas-resistance leakage-prevention system 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, which is far away from the gas turbine body 3, a speed ratio valve 6 is fixed at one end of the fuel pipeline 1, which is 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, a nitrogen-filled pipe 8 is fixed between the fuel pipeline 1, which is located between the auxiliary shut-off valve 7 and the speed ratio valve 6, a nitrogen-filled pipe 8 is fixed between the fuel pipeline 1, an evacuation pipe 9 is fixed between the safety shut-off valve 5 and the auxiliary shut-off valve 7, an evacuation pipe 9 is fixed between the fuel pipeline 1 and the auxiliary shut-off valve 7, a first pressure-area 14 and a second pressure-area 15, and a second pressure-area communication pipe 14 are respectively located between the auxiliary shut-area communication pipe 14;
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 pressure of the second pressure area 15 is increased to 0.5MPa to close the nitrogen charging valve 10; 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 greater 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, therefore, the second sliding column 773 pushes the microswitch 776, at this time, the control pressure regulating valve 138 is 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 start of the nitrogen charging pump is avoided, and energy consumption is reduced.
Referring to fig. 5, the limiting mechanism 75 includes a driving housing 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 housing 751 is fixed to one end of the top of the fuel pipeline 1 close to the communication pipe 71, the bottom of the driving housing 751 is communicated with the fuel pipeline 1, the first threaded rod 752 is rotatably connected to an inner wall of the driving housing 751 through a bearing, the first bevel gear 753 is fixed to one end of the first threaded rod 752, the first motor 754 is fixed to one end of the inner wall of the driving housing 751, the second bevel gear 755 is fixed to an 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 housing 751, the slider 756 is threadedly connected to the first bevel gear 753 through a threaded hole, the L-shaped rod 757 is fixed to the bottom of the slider 756, the first bevel gear 753 is driven to rotate through the first bevel gear 755, and the first threaded rod 752 is driven to slide the slider 752, so that the slider 752 slides the L-shaped rod 757 to drive the L-shaped rod 757 through the sliding gear 755.
Referring to fig. 5 and 7, the triggering mechanism 76 includes a limiting block 761, a first sliding slot 762, a top pillar 763, a trapezoidal groove 764, a second sliding slot 765, a top 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 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 slot 762 is provided with the second sliding slot 765, the inner wall of the second sliding slot 765 is slidably connected with the top rod 766, the end of the top rod 766 is provided with a chamfer, the top rod 766 is slidably connected with the inner wall of the trapezoidal groove 764, the chamfer surface of the top pillar 766 is slidably connected with the inclined surface of the trapezoidal groove 764, the inner wall of the first sliding slot 762 is fixed with the tension spring 767, and the bottom of the tension spring 763 is fixedly connected with the bottom of the top pillar 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 the 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 mode, the first spool 772 is in contact 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 774 are fixed at the tops of the two support plates 775, the microswitch 776 is fixed on the lower surface of the mounting plate 775, the top of the second spool 773 penetrates through a through hole to be in contact with the microswitch barrel 771, the second spring 777 is sleeved on the outer side of the second spool 777, one end of the second spring 777 is fixedly connected with the first spool 775, and 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, a connecting pipe 12 is fixed to a lower end of the nitrogen charging pipe 8, a buffer mechanism 13 is fixed to a top of the connecting pipe 12, the buffer mechanism 13 includes a buffer tank 131, a piston plate 132, a third spring 133, an adjusting plate 134, an internally threaded sleeve 135, a second threaded rod 136, a limiting rod 137 and a pressure regulating valve 138, the buffer tank 131 is fixedly communicated to a top of the connecting pipe 12, the piston plate 132 is slidably connected to an inner wall of the buffer tank 131, the third spring 133 is fixed to a top of the piston plate 132, the adjusting plate 134 is fixed to a top of the third spring 133, the internally threaded sleeve 135 is rotatably connected to a top of the buffer tank 131 through a bearing, the second threaded rod 136 is threadedly connected to an inner wall of the internally threaded sleeve 135, a bottom of the second threaded rod 136 is fixedly connected to the adjusting plate 134, the limiting rod 137 is fixed to one end of a top of the adjusting plate 134, the limiting rod 137 is slidably connected to a top of the buffer tank 131 through a sliding hole, the lower end of the nitrogen charging pipe 8 is fixedly connected to a bottom of the buffer tank 131, a U-shaped plate 139 is fixedly connected to a top of the second motor 1310, a second motor 1310, an output end of the second motor 1310 is fixedly connected to a gear ring 1312, and a motor 1311 is connected to an output end of a motor, and a motor ring 1312, and a motor are respectively engaged with a first motor 1311.
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 a pipeline, 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 operation 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 drives the second sliding column 773 upwards 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 internally threaded sleeve 135 can be driven to rotate, the internally 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 the pressure in the buffer tank 131 can be adjusted, so that different pressure conditions can be adapted;
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 all the prior art, and are not described herein in detail.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (9)
1. A nitrogen-filling air-resistance leakage-prevention system for a natural gas adjusting pipeline of a gas turbine comprises a fuel pipeline (1), a shunt pipe (2), a gas turbine body (3) and a fuel adjusting 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 adjusting valve (4) is respectively fixed on a plurality of branch pipes of the shunt pipe (2), the nitrogen-filling air-resistance leakage-prevention system is characterized in that a safety shut-off valve (5) is fixed at one end, far away from the gas turbine body (3), of the fuel pipeline (1), a speed ratio valve (6) is fixed at one end, close to the gas turbine body (3), of the fuel pipeline (1), an auxiliary stop valve (7) is fixed between the speed ratio valve (6) and the safety shut-off valve (5), a nitrogen-filling pipe (8) is fixed between the auxiliary stop valve (7) and the speed ratio valve (6), a nitrogen-filling pipe (9) is fixed at one end of the fuel pipeline (1), an emptying pipe (9) is fixed between the safety shut-off valve (5) and the auxiliary stop valve (7), and an emptying pipe (8) is fixed at one end of the fuel pipeline (10);
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 trigger mechanism (76) and a switch mechanism (77), wherein the communicating pipe (71) is fixed between a speed ratio valve (6) and a 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 mode, the limiting ring (74) is fixed to one end, close to the valve column (73), of the fuel pipeline (1), the limiting mechanism (75) is fixed to one end, close to the communicating pipe (71), of the top of the fuel pipeline (1), the trigger mechanism (76) is fixed to the movable end of the limiting mechanism (75), and the switch mechanism (77) is fixed to one end, close to the limiting mechanism (75), of the fuel pipeline (1).
2. The gas turbine natural gas adjusting pipeline nitrogen-filled air-resistance leakage-preventing system as claimed in claim 1, 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), 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 one end 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 (751) is slidably connected to the inner wall of the driving shell (751), and the slider (756) is connected with the L-shaped threaded rod (756) through the threaded rod (756).
3. The gas turbine natural gas conditioning pipeline nitrogen injection choke leak prevention system of claim 2, it is characterized in that the trigger mechanism (76) comprises a limiting block (761), a first sliding chute (762), a top post (763), a trapezoidal groove (764), a second sliding chute (765), a top rod (766) and a tension spring (767), the limiting block (761) is fixed at one end of the L-shaped rod (757), the top of the limiting block (761) is arranged in an arc shape matched with the inner wall of the fuel pipeline (1), the top of the limiting block (761) is connected with the inner wall of the fuel pipeline (1) in a sliding way, a first sliding groove (762) is arranged in the middle of the limiting block (761), the inner wall of the first sliding chute (762) is connected with a support pillar (763) in a sliding way, the lower end of the top pillar (763) is provided with a trapezoidal groove (764), the lower end of the inner wall of the first chute (762) is provided with a second chute (765), an ejector rod (766) is connected to the inner wall of the second sliding groove (765) in a sliding mode, a chamfer is arranged at the end portion of the ejector rod (766), and the mandril (766) is connected with the inner wall of the trapezoidal groove (764) in a sliding way, the chamfer surface on the mandril (766) is connected with the inclined surface of the trapezoidal groove (764) in a sliding way, an extension spring (767) is fixed on the inner wall of the first sliding groove (762), and the extension spring (767) is fixedly connected with the bottom of the ejection column (763).
4. The gas turbine natural gas adjusting pipeline nitrogen-filled gas-resistance leakage-preventing system according to claim 3, 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 limiting 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 to the top of the first sliding column (772), the supporting plate (774) is symmetrically fixed to the top of the switch barrel (771), the mounting plate (775) is fixed to the tops of the two supporting plates (774), the microswitch (776) is fixed to the lower surface of the mounting plate (775), the top of the second sliding column (773) penetrates through a through hole to be in contact with the top of the switch barrel (771), and the second sliding column (777) is connected with the second sliding column (777), and the spring (777) and the second sliding column is sleeved on the outer side of the second sliding column.
5. The gas turbine natural gas regulating pipeline nitrogen filling gas-resistance leakage-prevention system according to claim 2, wherein a connecting pipe (12) is fixed at the lower end of the nitrogen filling pipe (8), and a buffer mechanism (13) is fixed at the top of the connecting pipe (12).
6. The gas turbine natural gas adjusting pipeline nitrogen-filled gas-resistance leakage-preventing system as claimed in claim 5, wherein the buffering mechanism (13) comprises a buffer 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 buffer 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 buffer 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 buffer tank (131) through a bearing, the second threaded rod (136) is threadedly connected with the inner wall of the internal threaded sleeve (135), the bottom of the second threaded rod (136) is fixedly connected with the adjusting plate (134), the limiting rod (137) is fixedly arranged at one end of the top of the adjusting plate (134), the limiting rod (137) is slidably connected with the top of the buffer tank (131) through a sliding hole, and the pressure regulating valve (138) is fixedly arranged at the lower end of the nitrogen-filled pipe (8).
7. The gas turbine natural gas conditioning pipeline nitrogen-filled vapor lock leakage prevention system according to claim 6, wherein 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).
8. The gas turbine natural gas conditioning pipe nitrogen filled vapor lock leakage prevention system of claim 7, wherein said first electric machine (754) and said second electric machine (1310) are each a speed reduction motor.
9. The gas turbine natural gas regulating pipeline nitrogen-filling gas-resistance leakage-preventing system according to claim 8, 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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| CN202111180309.XA CN114017185B (en) | 2021-10-11 | 2021-10-11 | Nitrogen-filled air resistance leakage-preventing system for natural gas adjusting pipeline of gas turbine |
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