CN104153829A - Method and device for starting power system of turbine unit for automatically switching oil circuits - Google Patents
Method and device for starting power system of turbine unit for automatically switching oil circuits Download PDFInfo
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- CN104153829A CN104153829A CN201410341667.8A CN201410341667A CN104153829A CN 104153829 A CN104153829 A CN 104153829A CN 201410341667 A CN201410341667 A CN 201410341667A CN 104153829 A CN104153829 A CN 104153829A
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Abstract
The invention belongs to the technical field of power drive, and particularly relates to a method for starting a power system of a turbine unit for automatically switching oil circuits. The method includes detecting the rotation speed of a rotor of the power system of the turbine unit when the power system of the turbine unit is started; comparing a value of the detected rotation speed of the rotor of the power system of the turbine unit to a preset value and judging whether the value of the rotation speed of the rotor is larger than or equal to the preset value; gradually closing an outlet valve of a high-pressure starting oil pump under the control until an outlet check valve of the high-pressure starting oil pump is closed if the value of the rotation value of the rotor is larger than or equal to the preset value, and then stopping controlling the outlet valve of the high-pressure starting oil pump. The invention further provides a device for starting the power system of the turbine unit for automatically switching the oil circuits. The method and the device have the advantages that when the value of the rotation speed of the rotor of the power system of the turbine unit is larger than or equal to the preset value, the outlet valve of the high-pressure starting oil pump is gradually closed under the control, so that the outlet check valve of the high-pressure starting oil pump can be closed, a procedure for replacing the high-pressure starting oil pump by a main oil pump for supplying oil can be automatically completed, and the service life of a speed regulating system of the turbine unit can be prolonged.
Description
Technical field
The invention belongs to motivational drive technical field, particularly a kind of steam turbine set power system starting method and device of realizing oil circuit automatic switchover.
Background technique
Steam turbine is the rotary power machinery that the transformation of energy of steam is become to mechanical work, and main prime mover as generating use, also can directly drive various pumps, blower fan, compressor and propeller for vessels.Can also utilize steam discharge or the intermediate extraction of steam turbine to meet production and heat supply needs in life.
But starting to run well at steam turbine needs the regular hour, steam turbine rotates by Steam Actuation rotor, and passing in time makes the rotor speed of steam turbine increasing.Main oil pump is directly connected with the rotor of steam turbine, to regulate oil and lubricant oil for the normal operation of steam turbine set provides, along with the rotor speed of steam turbine is increasing, the main oil pump outlet pressure of steam turbine can and then increase.And before the rotating speed of rotor reaches normal operation rotating speed, for providing, the normal operation of steam turbine set regulates oil and lubricant oil by high voltage startup oil pump.In the time that the rotating speed of rotor reaches the rotating speed of normal operation, need stop high voltage startup oil pump feed, and turn by main oil pump and take over and carry out fuel feeding.Current steam-turbine unit is often difficult for automatically completing above-mentioned transfer process, may cause the injector moment oil-break in steam-turbine unit, and then make injector moment oil-break in the time directly stopping high voltage startup oil pump, causes the phenomenon of chaser to occur.So, the normal work of steam turbine can be affected, and the life-span of the speed control system of steam-turbine unit can be greatly reduced.
Therefore, need a kind of steam turbine set power system starting method and device that oil circuit automatically switches of realizing badly.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of steam turbine set power system starting method that oil circuit automatically switches of realizing, automatically switched to the process of main oil pump fuel feeding by high voltage startup oil pump feed to realize, avoid the phenomenon of chaser to occur, improve the life-span of the speed control system of steam-turbine unit.
For solving the problems of the technologies described above, the invention provides a kind of steam turbine set power system starting method that oil circuit automatically switches of realizing, comprise the steps:
Step a: while starting described steam turbine set power system, detect the rotor speed of described steam turbine set power system;
Step b: by the rotor speed value of the described steam turbine set power system detecting and predefined value contrast, judge whether the rotor speed value of the described steam turbine set power system detecting is more than or equal to described predefined value, if so, go to step c;
Step c: control described high voltage startup oil pump outlet portal and close gradually, for reducing the oil pressure of described high voltage startup oil pump, until after described high voltage startup oil pump outlet non-return door closes, stop controlling described high voltage startup oil pump outlet portal.
Further, also comprise when stop described steam turbine set power system after described step c, control described high voltage startup oil pump outlet portal and return to the described high voltage startup oil pump of described control outlet portal and close gradually previous open mode.
Further, also comprise after described step c and stop described high voltage startup oil pump, then control described high voltage startup oil pump outlet portal and return to the open mode of the described high voltage startup oil pump of described control outlet portal before closing gradually.
Further, described predefined value is between 2700 to 2950r/min.
A kind of steam turbine set power system starting method that oil circuit automatically switches of realizing provided by the invention, by in the time that the rotor speed of steam turbine set power system is more than or equal to predefined value, controlling high voltage startup oil pump outlet portal closes gradually, and then high voltage startup oil pump outlet non-return door is closed, reach the process that automatically completes main oil pump and take over high voltage startup oil pump feed, the life-span of having improved the speed control system of steam-turbine unit.
The device that the present invention also provides a kind of steam turbine set power system that realizes oil circuit automatic switchover to start, comprise: high voltage startup oil pump outlet portal: be arranged in described steam turbine set power system, for controlling the rise and fall of high voltage startup oil pump outlet port oil pressure of described steam turbine set power system; Detection unit: be connected with the rotor of described steam turbine set power system, when starting described steam turbine set power system, detect the rotor speed of described steam turbine set power system; Judging unit: described judging unit is connected with described detection unit, by the rotor speed value of the described steam turbine set power system detecting and predefined value contrast, judge whether the rotor speed value of the described steam turbine set power system detecting is more than or equal to described predefined value; Control unit: described control unit is connected with described judging unit, for in the time that the rotor speed value of described steam turbine set power system is more than or equal to described predefined value, controlling described high voltage startup oil pump outlet portal closes gradually, for reducing the oil pressure of described high voltage startup oil pump, until after the high voltage startup oil pump outlet non-return door of described steam turbine set power system closes, stop controlling described high voltage startup oil pump outlet portal.
Further, described control system comprises recovery unit, described recovery unit is connected with described detection unit, in the time that described detection unit detects that described steam turbine set power system transfers halted state to by operating condition, control described high voltage startup oil pump outlet portal and return to the open mode of the described high voltage startup oil pump of described control outlet portal before closing gradually.
Further, judging unit: described judging unit is connected with described high voltage startup oil pump outlet non-return door, judges whether described high voltage startup oil pump outlet non-return door closes; Control unit: described control unit is connected with described judging unit, be used for judging when described high voltage startup oil pump outlet non-return door is closed, stop high voltage startup oil pump, then control described high voltage startup oil pump outlet portal and return to the open mode of the described high voltage startup oil pump of described control outlet portal before closing gradually.
Further, described steam turbine set power system comprises main oil pump, main oil pump outlet non-return door, oil circuit switching valve, high voltage startup oil pump, high voltage startup oil pump outlet portal, high voltage startup oil pump outlet non-return door, injector and Steam Turhine Adjustment security system, described main oil pump is connected with the first main oil pump pipe and the second main oil pump pipe respectively, described the first main oil pump pipe is provided with main oil pump outlet non-return door, described the second main oil pump pipe is provided with oil circuit switching valve, described high voltage startup oil pump is connected with the first high voltage startup oil pump pipe and the second high voltage startup oil pump pipe respectively, described the first high voltage startup oil pump pipe is provided with successively described high voltage startup oil pump outlet non-return door and described high voltage startup oil pump goes out doorway, described the first main oil pump pipe and described the first high voltage startup oil pump pipe are connected to form the first tie point, described the first tie point is connected with described Steam Turhine Adjustment security system respectively and described injector connects, described the second main oil pump pipe is connected with described the second high voltage startup oil pump pipe and forms the second tie point, described the second tie point goes out doorway with described high voltage startup oil pump outlet non-return door or described high voltage startup oil pump and is connected, described control unit is connected with described high voltage startup oil pump outlet portal.
Further, described judging unit is connected with delayer, and described delayer is connected with the start button of described steam turbine set power system.
Further, described oil circuit switching valve is two-position three-way valve, one side of described oil circuit switching valve is connected with the outlet of described main oil pump, the opposite side of described oil circuit switching valve is connected with the second tie point, the spool side of described oil circuit switching valve has leakage hole, make in the time that the rotor speed value of described steam turbine set power system is less than described predefined value, described spool is in enable possition, the drain tap of described oil circuit switching valve is connected with the outlet of described main oil pump, in the time that the rotor speed value of described steam turbine set power system is more than or equal to described predefined value, described spool is in closed position, described the second main oil pump pipe and described the second high voltage startup oil pump pipe disconnect.With respect to prior art, the device that a kind of steam turbine set power system that realizes oil circuit automatic switchover provided by the invention starts, by detection unit detection rotor rotating speed, then judge through judging unit whether rotor speed is more than or equal to predefined value, if close gradually by control unit control high voltage startup oil pump outlet portal, and then the oil pump capacity of reduction high voltage startup oil pump, under the oil pressure effect of main oil pump, high voltage startup oil pump outlet non-return door is closed, and the oil pressure of main oil pump can be pushed into closed position by spool at this moment, high voltage startup oil pump cannot pass through oil circuit switch fuel feeding, the complete fuel cut-off of high voltage startup oil pump, main oil pump substitutes it and carries out fuel feeding, reach the process that automatically completes main oil pump and take over high voltage startup oil pump feed, improve the life-span of the speed control system of steam-turbine unit.
Brief description of the drawings
In order to be illustrated more clearly in embodiment of the present invention or technological scheme of the prior art, to the accompanying drawing of required use in mode of execution be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 a kind ofly realizes the schematic flow sheet of steam turbine set power system starting method that oil circuit automatically switches for what embodiment of the present invention one provided;
Fig. 2 a kind ofly realizes another schematic flow sheet of steam turbine set power system starting method that oil circuit automatically switches for what embodiment of the present invention two provided;
Fig. 3 a kind ofly realizes the structural representation of steam turbine set power system that oil circuit automatically switches for what embodiment of the present invention three provided;
The structural representation of the device that a kind of steam turbine set power system that realizes oil circuit automatic switchover that Fig. 4 provides for embodiment of the present invention three starts.
Wherein, 1, main oil pump; 2, main oil pump outlet non-return door; 3, oil circuit switching valve; 4, high voltage startup oil pump; 5, high voltage startup oil pump outlet portal; 6, high voltage startup oil pump outlet non-return door; 7, injector; 8, Steam Turhine Adjustment security system; 10, the rotor of steam turbine set power system; 20, detection unit; 30, judging unit; 40, control unit.
Embodiment
Below in conjunction with the accompanying drawing in embodiment of the present invention, the technological scheme in embodiment of the present invention is clearly and completely described, obviously, described mode of execution is only the present invention's part mode of execution, instead of whole mode of executions.Based on the mode of execution in the present invention, the every other mode of execution that those of ordinary skill in the art obtain, all belongs to the scope of protection of the invention.
Mode of execution one
As shown in Figure 1, Fig. 1 a kind ofly realizes the schematic flow sheet of steam turbine set power system starting method that oil circuit automatically switches for what embodiment of the present invention one provided.
A kind of steam turbine set power system starting method that oil circuit automatically switches of realizing provided by the invention.Wherein,
Step S10: while starting described steam turbine set power system, detect the rotor speed of described steam turbine set power system.In the present embodiment, start after steam turbine set power system, the rotor speed of steam turbine set power system constantly promotes.Because the oil pressure of main oil pump is along with the continuous lifting of rotor speed increases, when the outlet oil pressure of main oil pump reaches while being the outlet oil pressure of high voltage startup oil pump of steam turbine set power system fuel feeding while starting, high voltage startup oil pump feed need be transferred to main oil pump fuel feeding.Therefore, need to detect the rotating speed of rotor.In the present embodiment, by the rotating speed of the detection unit detection rotor that is connected with rotor.For example, detection unit can be speed probe, by the rotating speed of speed probe detection rotor.
Step S20: by the rotor speed value of the described steam turbine set power system detecting and predefined value contrast.In the present embodiment, steam turbine set power system has judging unit, judging unit is connected with detection unit, to receive the rotor speed value of the steam turbine set power system of detection unit detection, then the rotor speed value of reception and preset predefined value are compared, judge the magnitude relationship between predefined value and the rotor speed value of detection steam turbine set power system.
Be understandable that, in the time that the rotor speed value of steam turbine set power system reaches predefined value big or small, the oil pressure size of main oil pump equals the oil pressure size of high voltage startup oil pump.
Step S30: the rotor speed value of steam turbine set power system is more than or equal to predefined value? in the present embodiment, judging unit compares rotor speed and the predefined value of the steam turbine set power system of detection.If the rotor speed of the steam turbine set power system detecting is more than or equal to predefined value, go to step S40; If not, go to step S20, again rotor speed and the predefined value of the steam turbine set power system detecting are compared.
Be understandable that, judging unit can time per unit receive one-time detection unit inspection steam turbine set power system rotor speed value and judge.In some embodiments, judging unit is also connected with delayer, and delayer is connected with the start button of steam turbine set power system.Delayer arranges a delay time t, and when pressing after the start button of steam turbine set power system, steam turbine set power system starts.Now delayer carries out time delay, and after time delay delay time t, the rotor speed value of the steam turbine set power system that triggering judging unit reception detection unit detects also judges.So, can greatly reduce the detection time of detection unit and detect number of times, reducing because wrongheaded probability appears in fault, improving the stability of detection unit.
Step S40: control described high voltage startup oil pump outlet portal and close gradually, for reducing the oil pressure of described high voltage startup oil pump, until after described high voltage startup oil pump outlet non-return door closes, stop controlling described high voltage startup oil pump outlet portal.In the present embodiment, steam turbine set power system also comprises control unit, and control unit is connected with judging unit.The rotor speed of judging the steam turbine set power system of detection when judging unit is more than or equal to predefined value, and this information is sent to control unit, and control unit need be controlled high voltage startup oil pump fuel cut-off.In the present embodiment, steam turbine set power system comprises that high voltage startup oil pump goes out doorway and high voltage startup oil pump outlet non-return door, high voltage startup oil pump goes out doorway and is connected with high voltage startup oil pump outlet non-return door, and high voltage startup oil pump outlet non-return door is connected with high voltage startup oil pump.Be that high voltage startup oil pump can cut out and fuel cut-off by high voltage startup oil pump outlet non-return door.Control unit control high voltage startup oil pump outlet portal closing gradually, in this process, the outlet oil pressure of high voltage startup oil pump is declined, until the outlet oil pressure of high voltage startup oil pump is while being less than the oil pressure of high voltage startup oil pump outlet non-return door opposite side, high voltage startup oil pump outlet non-return door is closed, high voltage startup oil pump fuel cut-off.In the present embodiment, high voltage startup oil pump outlet non-return door opposite side is connected with main oil pump.In the time that high voltage startup oil pump outlet non-return door is closed, control unit stops controlling high voltage startup oil pump outlet portal.
Be understandable that, in the time judging that the rotor speed value of the steam turbine set power system detecting is more than or equal to predefined value, can indicate staff manually to close the operation of high voltage startup oil pump outlet portal by tutorial light.And while sensing that by pressure transducer high voltage startup oil pump outlet non-return door is closed, again indicate the manual stop control unit control of staff high voltage startup oil pump outlet portal to close gradually by tutorial light.The instruction of twice tutorial light can be distinguished by the tutorial light of different colours.
Be understandable that, in the present embodiment, can determine according to factors such as the working environments of concrete steam turbine set power system and reality the size of predefined value, better between 2700 to 2950r/min.
A kind of steam turbine set power system starting method that oil circuit automatically switches of realizing provided by the invention, detect the steam turbine set power system rotor speed after starting by detection unit, judging unit constantly judges steam turbine set power system rotor speed, until steam turbine set power system rotor speed is more than or equal to after predefined value, control unit control high voltage startup oil pump outlet portal is closed gradually, and then in the specific moment, the oil pressure in high voltage startup oil pump outlet port is reduced automatically, utilize closing of high voltage startup oil pump outlet non-return door, realize high voltage startup oil pump and automatically transferred high voltage startup oil pump feed to main oil pump fuel feeding in the time that the oil pressure of main oil pump reaches required oil pressure, improve the life-span of the speed control system of steam-turbine unit, by high voltage startup oil pump outlet portal is set, further improve the probability that high voltage startup oil pump outlet non-return door is closed, predefined value, between 2700 to 2950r/min, can be adjusted the size of predefined value flexibly, and predefined value is tallied with the actual situation, and improves the stability of steam turbine set power system.
Mode of execution two
As shown in Figure 2, Fig. 2 a kind ofly realizes another schematic flow sheet of steam turbine set power system starting method that oil circuit automatically switches for what embodiment of the present invention two provided.
Wherein,
Steps A 10: in the present embodiment, consistent with the step S10 in mode of execution one.
Steps A 20: in the present embodiment, consistent with the step S20 in mode of execution one.
Steps A 30: in the present embodiment, consistent with the step S30 in mode of execution one.
Steps A 40: in the present embodiment, consistent with the step S40 in mode of execution one.
Steps A 50: steam turbine set power system stops? in the present embodiment, according to the rotating speed of Speed sensing device inductiopn rotor.If the rotating speed of rotor is become and stopped from rotation, the judging unit being connected with Speed sensing device judges that steam turbine set power system stops, and goes to step A60.If judging unit time per unit judges the rotating speed of a Speed sensing device inductiopn rotor, if the rotating speed of rotor does not stop from rotating to become, return to steps A 40.
Be understandable that, can also pressure inductor be set in the outlet of main oil pump.In the time that pressure inductor senses that the outlet pressure value of main oil pump equals zero or is substantially zero, the judging unit being connected with pressure inductor judges that steam turbine set power system stops, and goes to step A60.
Steps A 60: control described high voltage startup oil pump outlet portal and return to the open mode of the described high voltage startup oil pump of described control outlet portal before closing gradually.In the present embodiment, the control unit control high voltage startup oil pump outlet portal being connected with high voltage startup oil pump outlet portal is opened gradually, until high voltage startup oil pump outlet portal is opened completely.
Be understandable that, can indicate staff to control high voltage startup oil pump outlet portal by tutorial light, the control switch of the openings of sizes for controlling high voltage startup oil pump outlet portal can be pulled by staff, to further ensure the stability of steam turbine set power system.
A kind of steam turbine set power system starting method that oil circuit automatically switches of realizing provided by the invention, compared with mode of execution one, by increasing judgement that whether steam turbine set power system is stopped and after judging steam turbine set power system and stopping, the size of opening of high voltage startup oil pump outlet portal being changed to the complete open configuration before startup, so that next time is while starting steam turbine set power system, high voltage startup oil pump outlet pressure can not form pressure drop after high voltage startup oil pump outlet portal, high voltage startup oil pump normal fuel injection while having guaranteed again to start, further promote the stability of steam turbine set power system.
Mode of execution three
As Fig. 3 and Fig. 4, Fig. 3 a kind ofly realizes the structural representation of steam turbine set power system that oil circuit automatically switches for what embodiment of the present invention three provided; The structural representation of the device that a kind of steam turbine set power system that realizes oil circuit automatic switchover that Fig. 4 provides for embodiment of the present invention three starts.
A kind of steam turbine set power system that oil circuit automatically switches that realizes provided by the invention, steam turbine set power system comprises main oil pump 1, main oil pump outlet non-return door 2, oil circuit switching valve 3, high voltage startup oil pump 4, high voltage startup oil pump outlet portal 5, high voltage startup oil pump outlet non-return door 6, injector 7 and Steam Turhine Adjustment security system 8, main oil pump 1 is connected with the first main oil pump pipe and the second main oil pump pipe respectively, the first main oil pump pipe is provided with main oil pump outlet non-return door 2, the second main oil pump pipe is provided with oil circuit switching valve 3, high voltage startup oil pump 4 is connected with the first high voltage startup oil pump pipe and the second high voltage startup oil pump pipe respectively, the first high voltage startup oil pump pipe is provided with high voltage startup oil pump outlet non-return door 6 successively and high voltage startup oil pump goes out doorway 5, the first main oil pump pipe and the first high voltage startup oil pump pipe are connected to form the first tie point, the first tie point is connected with Steam Turhine Adjustment security system 8 respectively and injector 7 connects, the second main oil pump pipe is connected with the second high voltage startup oil pump pipe and forms the second tie point, the second tie point is connected with high voltage startup oil pump outlet non-return door 6 or high voltage startup oil pump outlet portal 5, control unit is connected with high voltage startup oil pump outlet portal 5.
Concrete, the first main oil pump pipe is connected in a node and is connected with main oil pump 1 by this node with the end that the second main oil pump pipe is positioned at same one end, makes the oil that main oil pump 1 pumps flow into respectively the first main oil pump pipe and the second main oil pump pipe by node.On the first main oil pump pipe, be provided with main oil pump outlet non-return door 2, and be provided with oil circuit switching valve 3 on the second main oil pump pipe.In the present embodiment, the first main oil pump pipe has the first tie point away from the end of main oil pump 1, and this first tie point is divided into two pipelines, and one of them pipeline is connected to Steam Turhine Adjustment security system 8, and another is connected to injector 7.The second main oil pump pipe has the second tie point away from the end of main oil pump 1, and this second tie point is divided into two pipelines, and one of them pipeline is connected on the pipeline being connected with injector 7 in the first tie point, and another pipeline is connected with high voltage startup oil pump 4.Wherein, on the second tie point, be connected to pipeline corresponding on the pipeline connecting with injector 7 in the first tie point and there is the high voltage startup oil pump outlet portal 5 and the high voltage startup oil pump outlet non-return door 6 that set gradually.High voltage startup oil pump outlet non-return door 6 is connected with high voltage startup oil pump 4, and high voltage startup oil pump outlet portal 5 is connected with high voltage startup oil pump outlet non-return door 6.
See Fig. 4, as seen from Figure 4, the rotor 10 of steam turbine set power system is connected with detection unit 20 again; Detection unit 20 is connected with rotor 10 and the judging unit 30 of steam turbine set power system respectively; Judging unit 30 is connected with detection unit 20 and control unit 40 respectively; Control unit 40 is connected with judging unit 30.
In order further to explain the working principle of steam turbine set power system starting method of the present invention, as described below:
In the time starting steam turbine set power system, the rotor 10 of steam turbine set power system rotates, and the oil pressure of the main oil pump 1 being connected with rotor increases with the increase of rotor speed.And then the pressure oil that main oil pump 1 produces is divided into two-way through node, the first main oil pump pipe of leading up to also pushes the main oil pump outlet non-return door 2 that is positioned at the first main oil pump pipe, but when the turn up of rotor is during less than predefined value, the force value that main oil pump 1 produces pressure oil is not enough to main oil pump outlet non-return door 2 to push open, and then causes the oil in the first main oil pump pipe to flow to injector 7 and Steam Turhine Adjustment security system 8 by main oil pump outlet non-return door 2.Same, in the second main oil pipe, the oil pressure of oil is not enough to promote the spool in oil circuit switching valve 3, make the interior oil of the second main oil pipe by being positioned at the leakage hole draining of spool side, and then oil also cannot pass through oil circuit switch 3.
In said process, detection unit 20 detects rotor 10 rotating speeds of steam turbine set power system, and judge by the judging unit 30 being connected with detection unit 20 whether rotor 10 rotating speeds of steam turbine set power system are more than or equal to predefined value, if, the oil pressure that main oil pump 1 produces backs down the spool in main oil pump outlet non-return door 2 and oil circuit switching valve 3, make the oil of being exported by main oil pump 1 by main oil pump outlet non-return door 2 to first tie points, the oil of being exported by main oil pump 1 is pushed into the spool of oil circuit switching valve 3 state of closing.Reduce gradually by the opening of controlling high voltage startup oil pump outlet portal 5, to high voltage startup oil pump 4 is declined by the mobile oil pressure of high voltage startup oil pump outlet non-return door 6 backward high voltage startup oil pump outlet portal 5 directions, and then reversing appears in the oil pressure that makes high voltage startup oil pump outlet non-return door 6 two ends, the oil pressure that has the first tie point to be connected on the pipeline of injector 7 is greater than the oil pressure of high voltage startup oil pump 4, and then high voltage startup oil pump outlet non-return door 6 is closed.So, high voltage startup oil pump 4 stops outside fuel feeding.Main oil pump 1 is taken over high voltage startup oil pump 4 and is provided the oil with certain oil pressure to injector 7 and Steam Turhine Adjustment security system 8.
Be understandable that, can indicate staff to control high voltage startup oil pump outlet portal 5 by tutorial light, the control switch of the openings of sizes for controlling high voltage startup oil pump outlet portal 5 can be pulled by staff, to further ensure the stability of steam turbine set power system.
Be understandable that, control unit 40 also comprises recovery unit, and recovery unit starts after steam turbine set power system shuts down, and controls high voltage startup oil pump outlet portal 5 and return to and control the open mode of high voltage startup oil pump outlet portal 5 before closing gradually.
The device that a kind of steam turbine set power system that realizes oil circuit automatic switchover provided by the invention starts, by detection unit 20 detection rotor rotating speeds, then judge through judging unit 30 whether rotor speed is more than or equal to predefined value, if controlling high voltage startup oil pump outlet portal 5 by control unit 40 closes gradually, and then the oil pump capacity of reduction high voltage startup oil pump 4, under the oil pressure effect of main oil pump 1, high voltage startup oil pump outlet non-return door 6 is closed, and the oil pressure of main oil pump 1 can be pushed into closed position by spool at this moment, high voltage startup oil pump 4 cannot pass through oil circuit switch 3 fuel feeding, the complete fuel cut-off of high voltage startup oil pump 4, main oil pump 1 substitutes it and carries out fuel feeding, reach the process that automatically completes main oil pump 1 and take over high voltage startup oil pump 4 fuel feeding, improve the life-span of the speed control system of steam-turbine unit, by recovery unit is set, make high voltage startup oil pump outlet portal 5 return to control high voltage startup oil pump outlet portal 5 and close gradually previous open mode, the back pressure of high voltage startup oil pump 4 can not declined because of the high voltage startup oil pump outlet portal 5 arranging, while again starting steam turbine set power system, can ensure the fuel feeding effect of high voltage startup oil pump 4, further improve the stability of steam turbine set power system, by as the circuit design of Fig. 3, realize the fuel feeding carrying out voluntarily between high voltage startup oil pump 4 and main oil pump 1 and switch stability, by oil circuit switching valve 3 is set, make it have to discharge and switch main oil pump 1 produces before fuel feeding oil and can after fuel feeding, overcome the oil pressure that high voltage startup oil pump 4 produces the spool of oil circuit switching valve 3 is closed switching, stop draining, further realized the automation of fuel feeding handoff procedure, predefined value is arranged between 2700 to 2950r/min, has improved accommodation and the operation stability of steam turbine set power system.
Mode of execution four
The difference of present embodiment and mode of execution three is to control high voltage startup oil pump outlet portal and closes gradually, for reducing the oil pressure of high voltage startup oil pump, until after high voltage startup oil pump outlet non-return door closes, after stopping controlling high voltage startup oil pump outlet portal, also comprise and stop described high voltage startup oil pump, then control described high voltage startup oil pump outlet portal and return to the open mode of the described high voltage startup oil pump of described control outlet portal before closing gradually.
Concrete, judging unit is also connected with high voltage startup oil pump outlet non-return door, judges whether high voltage startup oil pump outlet non-return door closes; Control unit is connected with judging unit, when judging that high voltage startup oil pump outlet non-return door is closed, stops high voltage startup oil pump, then controls high voltage startup oil pump outlet portal and returns to and control the open mode of described high voltage startup oil pump outlet portal before closing gradually.
In the present embodiment, can away from a side of high voltage startup oil pump, pressure inductor be set at high voltage startup oil pump outlet non-return door, judge according to the oil pressure of pressure inductor induction whether high voltage startup oil pump outlet portal state closes, if judging high voltage startup oil pump outlet portal is closed condition, stop high voltage startup oil pump.Then controlling high voltage startup oil pump outlet portal returns to and controls the open mode of high voltage startup oil pump outlet portal before closing gradually.
The device that a kind of steam turbine set power system that realizes oil circuit automatic switchover provided by the invention starts, whether close and in time high voltage startup oil pump stopped by judging high voltage startup oil pump outlet portal state, avoid the idle running of high voltage startup oil pump or avoided idle running time of high voltage startup oil pump, improved the stability of system; And for mode of execution three, control more fast high voltage startup oil pump outlet portal and return to and control the open mode of high voltage startup oil pump outlet portal before closing gradually, improved the speed of response of system.
It should be noted last that, above embodiment is only unrestricted in order to technological scheme of the present invention to be described, although the present invention is had been described in detail with reference to example, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technological scheme of the present invention, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. realize the steam turbine set power system starting method that oil circuit automatically switches for one kind, described steam turbine set power system comprises that high voltage startup oil pump goes out doorway and high voltage startup oil pump outlet non-return door, described high voltage startup oil pump goes out doorway and is connected with described high voltage startup oil pump outlet non-return door, described high voltage startup oil pump goes out doorway or described high voltage startup oil pump outlet non-return door is connected with described high voltage startup oil pump, it is characterized in that, comprise the steps:
Step a: while starting described steam turbine set power system, detect the rotor speed of described steam turbine set power system;
Step b: by the rotor speed value of the described steam turbine set power system detecting and predefined value contrast, judge whether the rotor speed value of the described steam turbine set power system detecting is more than or equal to described predefined value, if so, go to step c;
Step c: control described high voltage startup oil pump outlet portal and close gradually, for reducing the oil pressure of described high voltage startup oil pump, until after described high voltage startup oil pump outlet non-return door closes, stop controlling described high voltage startup oil pump outlet portal.
2. the steam turbine set power system starting method of realizing oil circuit automatic switchover as claimed in claim 1, it is characterized in that: also comprise when stop described steam turbine set power system after described step c, control described high voltage startup oil pump outlet portal and return to the described high voltage startup oil pump of described control outlet portal and close gradually previous open mode.
3. the steam turbine set power system starting method of realizing oil circuit automatic switchover as claimed in claim 1, it is characterized in that: also comprise after described step c stopping described high voltage startup oil pump, then control described high voltage startup oil pump outlet portal and return to the open mode of the described high voltage startup oil pump of described control outlet portal before closing gradually.
4. the steam turbine set power system starting method of realizing oil circuit automatic switchover as described in claim 2 or 3 any one, is characterized in that, described predefined value is between 2700 to 2950r/min.
5. a device of realizing the steam turbine set power system startup of oil circuit automatic switchover, is characterized in that: comprising:
High voltage startup oil pump outlet portal: be arranged in described steam turbine set power system, for controlling the rise and fall of high voltage startup oil pump outlet port oil pressure of described steam turbine set power system;
Detection unit: be connected with the rotor of described steam turbine set power system, when starting described steam turbine set power system, detect the rotor speed of described steam turbine set power system;
Judging unit: described judging unit is connected with described detection unit, by the rotor speed value of the described steam turbine set power system detecting and predefined value contrast, judge whether the rotor speed value of the described steam turbine set power system detecting is more than or equal to described predefined value;
Control unit: described control unit is connected with described judging unit, for in the time that the rotor speed value of described steam turbine set power system is more than or equal to described predefined value, controlling described high voltage startup oil pump outlet portal closes gradually, for reducing the oil pressure of described high voltage startup oil pump, until after the high voltage startup oil pump outlet non-return door of described steam turbine set power system closes, stop controlling described high voltage startup oil pump outlet portal.
6. the device that the steam turbine set power system that realizes oil circuit automatic switchover as claimed in claim 5 starts, it is characterized in that, described control system comprises recovery unit, described recovery unit is connected with described detection unit, in the time that described detection unit detects that described steam turbine set power system transfers halted state to by operating condition, control described high voltage startup oil pump outlet portal and return to the open mode of the described high voltage startup oil pump of described control outlet portal before closing gradually.
7. the device that the steam turbine set power system that realizes oil circuit automatic switchover as claimed in claim 5 starts, is characterized in that,
Judging unit: described judging unit is connected with described high voltage startup oil pump outlet non-return door, judges whether described high voltage startup oil pump outlet non-return door closes;
Control unit: described control unit is connected with described judging unit, be used for judging when described high voltage startup oil pump outlet non-return door is closed, stop high voltage startup oil pump, then control described high voltage startup oil pump outlet portal and return to the open mode of the described high voltage startup oil pump of described control outlet portal before closing gradually.
8. the device that the steam turbine set power system that realizes oil circuit automatic switchover as described in claim 6 to 7 any one starts, it is characterized in that, described steam turbine set power system comprises main oil pump, main oil pump outlet non-return door, oil circuit switching valve, high voltage startup oil pump, high voltage startup oil pump outlet portal, high voltage startup oil pump outlet non-return door, injector and Steam Turhine Adjustment security system, described main oil pump is connected with the first main oil pump pipe and the second main oil pump pipe respectively, described the first main oil pump pipe is provided with main oil pump outlet non-return door, described the second main oil pump pipe is provided with oil circuit switching valve, described high voltage startup oil pump is connected with the first high voltage startup oil pump pipe and the second high voltage startup oil pump pipe respectively, described the first high voltage startup oil pump pipe is provided with successively described high voltage startup oil pump outlet non-return door and described high voltage startup oil pump goes out doorway, described the first main oil pump pipe and described the first high voltage startup oil pump pipe are connected to form the first tie point, described the first tie point is connected with described Steam Turhine Adjustment security system respectively and described injector connects, described the second main oil pump pipe is connected with described the second high voltage startup oil pump pipe and forms the second tie point, described the second tie point goes out doorway with described high voltage startup oil pump outlet non-return door or described high voltage startup oil pump and is connected, described control unit is connected with described high voltage startup oil pump outlet portal.
9. the device that the steam turbine set power system that realizes oil circuit automatic switchover as claimed in claim 6 starts, is characterized in that, described judging unit is connected with delayer, and described delayer is connected with the start button of described steam turbine set power system.
10. the device that the steam turbine set power system that realizes oil circuit automatic switchover as claimed in claim 6 starts, it is characterized in that, described oil circuit switching valve is two-position three-way valve, one side of described oil circuit switching valve is connected with the outlet of described main oil pump, the opposite side of described oil circuit switching valve is connected with the second tie point, the spool side of described oil circuit switching valve has leakage hole, make in the time that the rotor speed value of described steam turbine set power system is less than described predefined value, described spool is in enable possition, the drain tap of described oil circuit switching valve is connected with the outlet of described main oil pump, in the time that the rotor speed value of described steam turbine set power system is more than or equal to described predefined value, described spool is in closed position, described the second main oil pump pipe and described the second high voltage startup oil pump pipe disconnect.
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| CN104153829B (en) | 2015-11-18 |
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