CN202230373U - Automatic power plant start up & shut down system of gas-steam combined cycle unit - Google Patents
Automatic power plant start up & shut down system of gas-steam combined cycle unit Download PDFInfo
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- CN202230373U CN202230373U CN2011203491384U CN201120349138U CN202230373U CN 202230373 U CN202230373 U CN 202230373U CN 2011203491384 U CN2011203491384 U CN 2011203491384U CN 201120349138 U CN201120349138 U CN 201120349138U CN 202230373 U CN202230373 U CN 202230373U
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Abstract
The utility model discloses an automatic power plant start up & shut down system of a gas-steam combined cycle unit. The combined cycle unit at least comprises a gas turbine and gas turbine auxiliary system, a steam turbine and steam turbine auxiliary system, and also an exhaust-heat boiler, a balance of plant (BOP) system and a public system. The automatic power plant start up & shut down system covers the gas turbine and gas turbine auxiliary system, the steam turbine and steam turbine auxiliary system, the exhaust-heat boiler, the BOP system and the public system, and is a hierarchical control structure, separately being a unit coordination grade control module, a sub-unit grade control module and a device grade control module orderly from an upper layer to a lower layer. The automatic power plant start up & shut down system of the gas-steam combined cycle unit of the utility model enables the safe and reliable start up & shut down of the combined cycle unit to be realized, solidifies the unit start up & shut down process to the control system, thereby avoiding artificial maloperations, reducing the unit running artificial interventions substantially, and improving the unit reliability substantially.
Description
Technical field
The utility model relates to thermal technology's automation field technology of combustion and steam Combined Cycle Unit, relates in particular to an a kind of key start and stop control system of large-scale Combined Cycle Unit.
Background technology
One key start and stop (APS, automatic power plant start up & shut down system) are to realize that genset starts and the system of stopped process robotization, are one of recent development directions of Thermal Automation technology.As improving the horizontal efficient ways of unit automation, receive increasing concern of industry and attention.One key start and stop control system is powerful, it is advantageous that correctness, the standardization that can improve the unit start and stop, alleviates operations staff's working strength greatly.But the unit start-stop time is shortened in the security of an effective key start and stop control system enhancement apparatus operation, reduces the energy consumption of unit shutdown process, improves the automatization level of unit on the whole.
But key start and stop simultaneously are systems of a bulky complex, and design and enforcement all have big difficulty.Domestic in recent years many newly-built coal-fired units and Combined Cycle Unit all attempt to design a key start and stop control system.
CN102080579A discloses a kind of nuclear power station Turbo-generator Set start and stop control method, device and DCS control system, and this method comprises: the running status of the backup system of the running status of detection Turbo-generator Set and operational factor, Turbo-generator Set and the failure message of operational factor and Turbo-generator Set emerged in operation; With the concentrated same function tracking interface that is presented at of detected above-mentioned information; Follow the tracks of the above-mentioned information of interface display according to function and directly row control is transported in the start and stop of Turbo-generator Set.The method that this utility model application provides can make operator find the unusual of steam turbine genset intuitively, fast; And obtain key parameter fast and accurately and judge reason; Thereby operator can be transported the start and stop of nuclear power station steam turbine genset to a certain extent intuitively, fast and accurately to go control and intervenes the safety of assurance nuclear power station steam turbine genset.But the start and stop control method of above-mentioned nuclear power station can't be applied on the gas-vapo(u)r associating unit, and the start and stop range of control is not comprehensive yet, and automaticity is not high.
Another important branch coal fired power generation unit of genset also has employing one key start and stop control system; But because the technological process of coal fired power generation unit is complicated; An existing key start stop system can't satisfy complicated working condition requirement, finally causes this system can't realize the key start and stop on the complete meaning and only can operate the start and stop that the plurality of sub group is carried out single sub-process system by the operations staff.
The conventional relatively coal-fired unit of combustion and steam Combined Cycle Unit, technological process is simple, and the integrated level of combustion machine and turbine control system is high, and the basic condition of implementing APS is arranged.But the combustion and steam Combined Cycle Unit has two big characteristics again: the necessary load-responsive of first combustion and steam Combined Cycle Unit is fast, and the start-up time of unit, more coal-fired unit shortened (therefore being used for peak load regulation network) greatly; Two to be that Combined Cycle Unit opens, stops frequent for it, is generally to open day and stops night.
Exploitation, the applicable cases of the present domestic combustion and steam APS of combined-cycle power plant:
1, CLP power plant has realized that the key of preparatory stage starts before the subsidiary engine device start, and the start and stop program has been done to revise and perfect, shortens to 29 minutes from original 55 minutes when making the key payment for initiation of its preparatory stage.
2, Shenzhen power plant reports that three units of its those under one's command in 2007 have realized that all an omnidistance key starts, but sees that from the report data processes such as its boiler water filling still adopt manual mode to carry out, and starts and still has gap so leave an omnidistance FR key.
3, Shanghai is fired dynamo-electric factory and only is implemented in the key start and stop function that the TCS side is promptly fired the actuating section of machine-steam turbine-generator, and its APS is not contained stove island and BOP (balance of plant) system.
Can find out; Though domestic several home fuel gas Steam Combined Cycle units have carried out the exploitation of a key start and stop control system at present; But the device range that relates to from start and stop; The automaticity of shutdown process, and aspect analyses such as the economy of shutdown process and security still remain further to optimize and improve.
Therefore, those skilled in the art is devoted to develop the high Combined Cycle Unit of a kind of automaticity one key start and stop control system.
The utility model content
Because the above-mentioned defective of prior art, the utility model technical matters to be solved provides the Combined Cycle Unit one key start and stop control system that a kind of automaticity is high, security is good, improves with the above-mentioned defective to prior art.
For realizing above-mentioned purpose; The utility model provides an a kind of key start and stop control system of combustion and steam Combined Cycle Unit; Said Combined Cycle Unit comprises combustion machine and combustion machine backup system, steam turbine and steam turbine backup system at least, also comprises waste heat boiler, BOP system and synergic system; A said key start and stop control system covers said combustion machine and combustion machine backup system, said steam turbine and steam turbine backup system, said waste heat boiler, said BOP system and said synergic system; A said key start and stop control system is the step control structure, is followed successively by unit cooperative level control module, son group level control module and device level control module by the upper strata toward lower floor.
Further, at the condensate calorifier inlets place of said waste heat boiler bypass Electrically operated gate and small-bore pipeline are set.
Further, in the condensate system of said waste heat boiler, the water filling door of said condensate system is an Electrically operated gate, and to each user's house steward, the female pipe of user Electrically operated gate is set in said condensate system.
Further, the setting of cancellation throttling orifice plate on high pressure main steam heating coil passage.
Further, all adopt branched structure and/or redirect structure in said unit cooperative level control module, the said son group level control module.
Further, said son group level control module, said device level control module all adopt also row major calling logic; In same step preface, carry out the call operation of a plurality of said son group level control modules or said device level control module, final execution sequence is limited by the execution enabled condition of said son group level control module or said device level control mould.
Further, said unit cooperative level control module, son group level control module all is provided with bypass structure along controlling in the logic.
Further, said son group level control module comprises B of Unit OP control module, combustion machine control module, steam turbine control module, the control of HRSG (heat recovery steam generator) boiler circuit, synergic system control module.
Further, the artificial judgment point of a said key start and stop control system all adopts the control mode of automatic logic determines with confirming point.
Further; The start-up control of a said key start and stop control system comprises that successively subsidiary engine starts in the said BOP system; The last water of said waste heat boiler, the startup of said combustion machine is incorporated into the power networks, and bypath system cooperates said waste heat boiler increasing temperature and pressure; The red switch of said steam turbine, warming-up and be incorporated into the power networks, said Combined Cycle Unit according to the operating mode of boiler and steam turbine by the given pace load up to basic load.
Further, a said key start and stop control system has boiler water filling, combustion machine igniting preparation, three kinds of start-up mode of combined cycle startup in start-up control.
Further, a said key start and stop control system comprises the boiler water filling programmed control.
Further, in the injecting process of said Combined Cycle Unit, bypass deaerating type of cycles and the synchronous water filling of condensate well heater, and with the sign of deaerator level as fills with water.
Further, a said key start and stop control system adopts the boiler high, medium and low voltage to go up the technology of water simultaneously.
Further, in the said key start and stop control system, adopting condensate pump or deoxygenation pump in cold conditions or warm attitude is the technology of boiler water filling, when making the startup of feed pump postpone till said combustion machine igniting.
Further, in start-up course, utilize drum pressure to judge when unit is in cold conditions, select to replace water on the feed pump with the deoxygenation pump.
Further; The inactive control of a said key start and stop control system comprises the Reduction of Students' Study Load lotus successively to the minimum aperture of the entry guide vane IGV of said combustion machine, and said steam turbine is shut down, and continues the minimum load of Reduction of Students' Study Load lotus to said Combined Cycle Unit; Said combustion machine is shut down, and the subsidiary engine of said BOP system is shut down.
Further, a said key start and stop control system continues as the moisturizing of high, medium and low voltage drum to keep normal zero level in back one setting-up time of stopping using.
Further, a said key start and stop control system is closed height, intermediate pressure by-pass in the back of stopping using in half an hour, and the stoppage in transit feed pump.
Further, said unit cooperative level control module shifts to an earlier date some hrs stoppage in transit feed pump in the control of stopping using.
Further, a said key start and stop control system has the vacuum system of stopping, does not stop two kinds of shutdown mode of vacuum system in the control of stopping using.
Further, a said key start and stop control system also comprises intelligent alarm system, and said intelligent alarm system takes overtime judgement and/or status of equipment abnormal logic to judge.
The beneficial effect of the utility model:
The one key start and stop control system of the utility model is because said structure and controlling Design, and its start-up course has realized Combined Cycle Unit from full cut-off to band at full capacity, its stopping process realized Combined Cycle Unit from full capacity to the unit full cut-off.The one key start and stop control system covering scope of the utility model is wide and run through the start and stop overall process of combustion and steam Combined Cycle Unit, and all equipment of being controlled by DCS and TCS are all included the range of control of a key start and stop control system of the utility model in.
Particularly; The one key start and stop control system of the utility model has realized starting from the combustion machine and has prepared, lighted a fire, has been incorporated into the power networks, the hydrophobic blowdown increasing temperature and pressure of waste heat boiler, bypass cooperate increasing temperature and pressure, steam turbine admission condition to satisfy the process that reaches red switch, Combined Cycle Unit band initial load; Until whole starting process by given pace application of load to basic load; And reach minimum aperture by given pace Reduction of Students' Study Load lotus to entry guide vane IGV (inlet guide vane) from the combustion machine; Steam turbine progressively cuts out pitch and shuts down, and bypass cooperates to shut down keeps the high, medium and low voltage system pressure, and the combustion machine continues the Reduction of Students' Study Load lotus and exerts oneself to minimum; The shutdown of combustion machine, waste heat boiler heat-insulation pressure keeping, until the key start and stop control of the whole stopping process of subsidiary engine equipment downtime; The scope of the start and stop equipment that it relates to is extensively, the height of the automaticity of shutdown process, and the economy of shutdown process and security, all is superior to a key start and stop control system of existing any Combined Cycle Unit greatly.
One key start and stop control system of the combustion and steam combined cycle of the utility model has realized the safe and reliable start and stop of Combined Cycle Unit; The shutdown process of unit is cured to control system; Prevented artificial maloperation; The unit operation human intervention significantly reduces, and the reliability of unit improves greatly.
Below will combine accompanying drawing that the technique effect of design, concrete structure and the generation of the utility model is described further, with purpose, characteristic and the effect of understanding the utility model fully.
Description of drawings
Fig. 1 is the structural principle block diagram of a key start and stop control system of the utility model.
Fig. 2 is the structural representation of a key start and stop control system one specific embodiment of the utility model.
Fig. 3 is the startup FB(flow block) of a key start and stop control system of the utility model.
Fig. 4 be the utility model a key start and stop control system stop FB(flow block).
Fig. 5 is the FB(flow block) that water conservancy project is planted on the waste heat boiler in the prior art.
Fig. 6 is the FB(flow block) of water conservancy project skill on the waste heat boiler in the key start and stop control system of the utility model.
Fig. 7 is the structural representation of the case-involving system of waste heat boiler in the utility model.
Fig. 8 is the structural representation of the condensate system in the utility model.
Fig. 9 is the structural representation of the high pressure system of the unit in the utility model.
Embodiment
The utility model is an a kind of key start and stop control system of combustion and steam Combined Cycle Unit, and this combustion and steam Combined Cycle Unit has four units, and every unit is divided into machine island, stove island and BOP system three parts again.Wherein, the machine island comprises combustion machine and combustion machine backup system, steam turbine and steam turbine backup system, generator and generator backup system; The stove island comprises waste heat boiler and backup system; Part except that machine island, stove island is subordinate to the BOP system.
The technological process of combustion and steam Combined Cycle Unit can resolve into several bulks that combustion machine, generator, steam turbine, waste heat boiler etc. have relatively independent process.In the prior art in present technique field; The program control technology of combustion machine, steam turbine itself is ripe relatively and complete, so the key of a key start and stop control system of the Combined Cycle Unit of the utility model is that control with the control of waste heat boiler and BOP and combustion machine, steam turbine integrates.
In one embodiment, DCS of combustion and steam Combined Cycle Unit (distributed control system scattered control system) and TCS (turbine control system scattered control system) adopt incorporate Siemens T3000 system.Organic island, Lu Dao, BOP island are all unified to be controlled by Siemens T3000 system.Being configured to of the full T3000 of factory control system: every unit one cover T3000 control system is total to quadruplet; Synergic system is furnished with a cover T3000 control system in addition.
One key start and stop control system (being APS) of the combustion and steam combustion machine Combined Cycle Unit of the utility model can be launched based on the T3000 system.Obviously, the realization of a key start and stop control system of the utility model is not limited to the T3000 system in the present embodiment, also can adopt other systems commonly used in the prior art.
One key start and stop control system (APS) means whole-process automatic, and the automatic control system of Combined Cycle Unit has been proposed very high requirement.In the shutdown process of Combined Cycle Unit, the control emphasis of APS is through reasonable and tight sequential control module, accomplishes the safety and the economic start and stop of combustion machine, steam turbine, waste heat boiler and utility appliance.One of key of APS is to realize the seamless connection of sequential control module and closed-loop control, makes loops such as regulating water level, vapor pressure adjusting, the adjusting of steam steam temperature realize that in the start and stop stage whole process comes into operation automatically.
At the whole starting process difficult point that not establish any " control breakpoint " be APS place.For now, the start-up course of all Siemens's steam turbines has all kept two " control breakpoints " (artificial judgment point, affirmation point) without any exception, and all is to rely on artificial judgment.But what the utility model proposed substitutes the controlling schemes of " artificial judgment " by " judging automatically ", makes more reliable, safer, the science more of unit operation, has also expanded the integrality of a key start and stop control system.
Like Fig. 1, shown in Figure 2; One key start and stop control system of the combustion and steam Combined Cycle Unit of the utility model; Its essence is the program control greatly of unit level; Particularly, this key start and stop control system is the step control structure, is followed successively by unit cooperative level control module, son group level control module and device level control module by the upper strata toward lower floor.Owing to adopt modular design well arranged; All son group level control modules that will be subordinate to unit DCS and TCS control; The for example control module of steam turbine and steam turbine backup system (or name " functionalities "), the control module of combustion machine, the control module of B of Unit OP, control module of synergic system or the like; Pool all automatically drops into and need not operations staff's intervention in a unit cooperative level control module.
On the basis of three grades of hierarchical block controls, the utility model adopts the method for parallel calling in a large number, and son group level control module, device level control module all adopt also row major calling logic.Promptly in same step preface, carry out the call operation of a plurality of son group level control modules or device level control module; Final execution sequence acceptor group level control module or the restriction of the execution enabled condition of device level control module; To guarantee technological requirement, reduced the stand-by period of equipment to greatest extent.
As shown in Figure 3; The start-up control part of the one key start and stop control system of the utility model comprises that subsidiary engine starts in the BOP system, and the steam turbine backup system starts; The last water of waste heat boiler; The startup of combustion machine is incorporated into the power networks, and bypath system cooperates the waste heat boiler increasing temperature and pressure, the red switch of steam turbine, warming-up and be incorporated into the power networks; Combined Cycle Unit is pressed the given pace load up to basic load according to the operating mode of boiler and steam turbine, and adopts automatic logic determines to replace fully two " control breakpoints " (artificial judgment point, affirmation point) of start-up control process of the prior art.
For example, allow warming-up and " artificial release " steam turbine from the 870rpm red switch to 3000rpm these two " control breakpoint ", adopt automatic logic determines to replace existing manual and judge the qualified back of carbonated drink quality " artificial release ".
In a practical implementation; The technological requirement that the one key start and stop control system of the utility model starts according to the combustion machine; The startup of design combustion machine is along controlling as follows: at first start combustion machine utility appliance: comprise start-up control oil and lubricating oil system, open the compressor inlet baffle plate; Open pneumatic plant anti-asthma valve, start rock gas draining system etc.; After the combustion facility are equipped with entry condition, start converter plant SFC (static frequency convertor) and carry out the boiler purging selectively or drag the combustion machine; Open the rock gas pitch during to fire speed and put the raising speed of fighting, the SFC that stops using behind the turn up 35Hz arrives occlusion pressure mechanism of qi anti-asthma valve behind certain rotating speed; Behind the combustion machine simultaneous interconnecting, combustion of natural gas is switched to premixed from diffusion.
The utility model Middle combustion engine starts the original advantage of comparing with conventional method along control and is: carry out waste heat boiler selectively and purge.In a key start and stop control system, be designed with the situation of logical record shutdown last time.If caused shutting down because of combustion machine trip reason last time, it is residual to think that then waste heat boiler inside has without the rock gas of burning, and then this combustion machine need purge before starting.If orderly closedown, then this combustion machine needn't purge before starting, and directly drags the combustion machine by converter plant and behind certain rotating speed, lights a fire.The method both can shorten the start-up time (purge time is 12 minutes) of unit when the normal start and stop of unit, can significantly reduce the plant consumption (SFC drags rated power 4MW) of start-up course again.
Be illustrated in figure 4 as the utility model a key start and stop control system stop control procedure.The inactive control section of the one key start and stop control system of the utility model comprises that shutting down preceding set auxiliary machinery equipment downtime prepares, and the Reduction of Students' Study Load lotus is to the minimum aperture of the entry guide vane IGV of combustion machine; Steam turbine is shut down; Continue the minimum load of Reduction of Students' Study Load lotus to Combined Cycle Unit, the combustion machine is shut down, the waste heat boiler heat-insulation pressure keeping; The steam turbine backup system is stopped transport, and the subsidiary engine of BOP system is stopped transport.
For the utility model difference with the prior art clearly is described, be made as example with water control on the waste heat boiler.Referring to shown in Figure 5; Current journey on the waste heat boiler of routine is after condensate, feedwater and oxygen-eliminating device system start-up in the prior art, calls son group control module (i.e. " along control ") one by one and carries out the moisturizing of low pressure, middle pressure, high pressure drum and economizer; When mainly considering the cold start operating mode; The boiler replenishing water amount is big, and demineralized water has little time to replenish, and can cause condensate pump to trip because of water level of thermal well is low.The method of prior art has inferior position when Combined Cycle Unit is temperature, hot starting, hot start operating mode.When temperature, hot starting, hot start operating mode, for reducing drum wall temperature difference up and down, the last discharge of single drum and economizer is little, and the demineralized water make-up flow is underused.
As shown in Figure 6, current journey on the waste heat boiler in the key start and stop control system of the utility model after subsidiary engine starts completion, possesses last water condition, is carried out the last water group control module (i.e. " along control ") of high, medium and low voltage simultaneously.Through the coordination of last water total flow Dynamic Closed Loop Control, keep total mobile equilibrium of going up the water yield and demineralized water maximum flow of three pressing systems.
Therefore, total when a key start and stop control system of the utility model can both guarantee the cold start operating mode to go up the water time consistent with conventional method, the water time on when warm, hot starting, hot start operating mode, shortening effectively again.
Further,, all adopt branched structure and/or redirect structure in unit cooperative level control module, the son group level control module, make same suitable control logic applicable to different start and stop working condition requirements for adapting to the multiple start and stop operating mode of unit.
Simultaneously on the logical foundations of branched structure and redirect structure; For providing different start and stop degree, the operations staff selects; The one key start and stop control system of the utility model has boiler water filling, combustion machine igniting preparation, three kinds of start-up mode of combined cycle startup, stops vacuum system, does not stop two kinds of shutdown mode of vacuum system.
With calling of control module of water supply system group level is example: when cold start, no pressure in the boiler leans on condensate pump and deoxygenation thrust of pump can water be transported in the drum; And temperature, during hot starting, hot start, the drum internal pressure is higher, must start feed pump and can carry out moisturizing to drum.Feed pump is high-power (power of motor 2400KW) equipment; If adopt single-mode on drum, promptly to start feed pump before the water; With the significant wastage that causes station service; Therefore in unit cooperative level control module, adopt branched structure, judge that according to the height of drum pressure Combined Cycle Unit belongs to cold conditions or hot starting, hot start operating mode.If the cold start operating mode then walks to lead directly to branch along control, do not start feed pump and promptly begin to go up water; If the hot starting, hot start operating mode is then called feed pump earlier along control and opened along control, carry out again and go up water group control module.
Further, can begin to carry out from any operating point, in the suitable control logic of unit cooperative level control module, son group level control module bypass structure is set all for making a key start and stop control system.Promptly son group level control module need not to begin to carry out from the equipment full cut-off state that this child group relates to when starting along control, and son group logic can mask some step preface according to the current state of equipment.Therefore, except that needn't repeating operated step preface, the execution of also having avoided some step preface effectively makes a key start and stop control system of the utility model have more dirigibility to the influence of operational outfit.
With calling of control module of the sub-group level of water supply system is example: owing to the demands of different of the different operating modes of cold and hot state to startup feed pump sequential, unit cooperative level control module can be called feed pump for twice and start suitable control.When calling for the second time feed pump, be provided with the bypass condition,, then no longer repeat start-up operation if existing feed pump is in running status along control.Should not repeat is because feed pump need cut out all valves on the export pipeline along control before starting, and adopts the mode that opens pump of closing the door to prevent pipe vibration.Therefore if when feed pump moves, carry out again and open pump, then can cause the repetitive operation of related valve, and interrupt the last aquaporin got through along control.
In addition, because a key start and stop control system of the utility model adopts parallel logical organization, synchronization often has a plurality of son group level control modules to control at the equipment to unit, and the operations staff can't follow the tracks of one by one simultaneously and check.Therefore; The one key start and stop control system of the utility model also comprises intelligent alarm system; Take overtime judgement and/or status of equipment abnormal logic decision logic; Be that a key start and stop control system provides abundant running state information, the operations staff only needs when abnormal alarm occurring, to carry out tracking processing and gets final product.
One key start and stop control system also means whole-process automatic, and the closed loop adjustment loop is had higher requirements.Be different from operations staff's manually operation earlier in the prior art; Treat again closed loop to be thrown automatic mode after operating mode is stablized, a key start and stop control system of the utility model is by accomplishing coming into operation automatically of closed loop and guarantee the no big disturbance in safe range of controlled flow process parameter along control.The combined method that realizes this function comprise become the closed loop setting value, become the closed loop pid parameter, shutdown process chooses other parameters as the closed loop controlled volume, change technological means such as the different pursuit gains of closed loop are set according to the shutdown process parameter.
Be controlled to be example with the drum feedwater; The feedwater closed-loop control is coordinated realization steam water-level whole-process automatic control with suitable control group: in the boiler water filling stage; Along control The Water Level Control of Steam is switched to the feedwater flow control mode, continue after priming level, to close pitch to water on the drum by certain flow value.Boiler opens the pressure stage after the starting ignition of combustion machine: after drum began to expand, along the operation of control execution water level settings value trace actual value, pitch is the aperture of maintenance bond economizer minimum flow only; Reach more than 20% or after the drum pressure ascending amount reaches certain definite value when boiler continues the increasing temperature and pressure evaporation capacity; Then judge that along control the steam water-level expansion finishes; The pitch that will feed water control unperturbed switches to normal zero level control, and carries out the control model switching of single pulse and three momentums.
Therefore a key start and stop control system of the utility model has realized coming into operation automatically of closed loop in the shutdown process and has guaranteed not receive artificial factor.
Further, a key start and stop control system of the utility model also comprises the boiler water filling programmed control.Adopting condensate pump and deoxygenation pump in cold conditions or warm attitude is the mode of boiler water filling, when making the startup of feed pump postpone till the combustion machine to light a fire, has reduced the plant consumption in the start-up course.Adopt high pressure drum pressure and deoxygenation pump discharge pressure difference to judge whether to start water on the feed pump, the high pressure drum pressure is higher when hot, then be earlier in, water on the low-pressure drum, restarting feed pump is water on the high pressure drum.
Further, be the rapidity and the economy of the key start and stop control system that improves the utility model, start flow process and adopt the boiler high, medium and low voltage to go up the technology of water, quickening toggle speed simultaneously.Improving through process system on the one hand increases the demineralized water supply capacity, controls high, medium and low three on the other hand respectively and presses on the drums discharge and then control boiler always to go up discharge, makes the last water time shortening of waste heat boiler.
Further, it be the technology of boiler water filling that a key start and stop control system adopts condensate pump (power of motor 640KW) or deoxygenation pump (power of motor 200KW) in cold conditions or warm attitude, when making the startup of feed pump postpone till the combustion machine to light a fire.Through reasonable arrangement and best of breed, the Program Synchronization that can carry out is side by side carried out.As top bypass deaerating type of cycles with coagulate adding system, the utility model can be controlled original program and be about 390 minutes (cold conditions) T.T., is optimized for and programme controlled T.T. arranged side by side foreshortens to 270 minutes (correspondingly, hot required time is the shortest about 40 minutes).
Open the characteristics of stopping two-shift operation night to the combustion and steam Combined Cycle Unit as peak regulation unit day, a key start and stop control system of the utility model continues as the moisturizing of high, medium and low voltage drum and keeps normal zero level in the certain hour after shutdown.Moisturizing time when this method promptly can shorten next day Combined Cycle Unit starts, can utilize the accumulation of heat of boiler that hot water is mended into drum again, reduce the drum wall temperature difference that moisturizing brings, and then load up speed is reduced by the degree of wall temperature difference restriction when started next time.
The one key start and stop control system of the utility model adopts the combustion machine to shut down the method that the back waste heat boiler gets into the heat-insulation pressure keeping pattern as early as possible; Height, intermediate pressure by-pass are closed in half an hour in the back stopping using; And stoppage in transit feed pump; Lower the electric quantity consumption of subsidiary engine in the stopping process, reduced losing of energy through heat-insulation pressure keeping again.
Further, unit cooperative level control module is in the control of stopping using, and some hrs (general three hours) stoppage in transit feed pump can reduce station service power consumption rate effectively in advance.
In some other embodiment of the utility model, as shown in Figure 7, condensate well heater 1 has been shown among the figure, has added import Electrically operated gate 2, bypass oxygen-eliminating device 3, oxygen-eliminating device import pitch 31, oxygen-eliminating device outlet pitch 32, deoxygenation pump 33, feed pump 4 parts such as grade with fixed attention.Automatic Control for water on the waste heat boiler in the realization unit starting process; Be provided with bypass Electrically operated gate 11 and small-bore pipeline 12 in the increase of the porch of condensate well heater 1; And the method for employing condensate well heater, water supply system pipeline and the synchronous water filling of bypass oxygen-eliminating device, the Automatic Control of water on the realization said system.
In the prior art; Because condensate well heater inflow point only disposes a two positions Electrically operated gate; When the condensate well heater is intake first; For preventing that blank pipe from water hammer start taking place, need the operations staff to arrive certain little aperture to manually slowly shaking this Electrically operated gate on the spot, treat condensate well heater standard-sized sheet Electrically operated gate again behind the full water.The utility model is because after having increased above-mentioned bypass Electrically operated gate newly; When intaking first, open little bypass Electrically operated gate earlier and slowly be condensate well heater and follow-up system water filling by logic control; And after the pressure rising water filling of judging the condensate well heater is accomplished, open condensate well heater master Electrically operated gate again.
In the prior art because its structural design; Adopting is separately the method for condensate well heater, bypass oxygen-eliminating device, water supply system and pipeline water filling successively; Because condensate well heater and water supply system can't be judged after the water filling whether emptying of air in control system, therefore need the operations staff to manually opened air discharging manually operated door inspection affirmation on the spot.The utility model is owing to adopted the said structure design; Can adopt the control method of above-mentioned three systems water filling simultaneously; After each system's valve opening is communicated with, if after the highest oxygen-eliminating device water filling in position reaches certain water level, then can judge other system fills with water and emptying.
Other embodiment, as shown in Figure 8, condenser 5, condensate pump 51, condenser moisturizing pitch 52 have been shown among the figure, have removed parts such as iron filter 53, gland heater 54.Full-automatic for realizing that condensate system starts; The utility model improves the valve of condensate system; Change the water filling door of condensate system 55 into Electrically operated gate by manually operated door, and to each user's house steward, increased the female pipe of user Electrically operated gate 56 in condensate system.
Before condensate system starts, must be earlier to condensing water conduit water filling avoid blank pipe to start water hammer takes place.In the prior art, when starting, need by the operations staff to manual operation water filling door on the spot.The utility model is because said structure design, with the water filling door by manually change electronic after, saved manually-operated step.More and the part water system of condensate number of users is isolated with manually operated door, when condensate pump starts if close the user side valve one by one, length consuming time and omitting easily.After the utility model increases the female pipe of user Electrically operated gate, when condensate pump starts, only need logic control to close total door and can satisfy the condensate pump entry condition.
Other embodiment, as shown in Figure 9, parts such as condenser 5, intermediate pressure cylinder 6, intermediate pressure by-pass 61, high pressure cylinder 7, high pressure turbine by 71, high pressure main steam heating coil passage 8, heating coil valve 81 have been shown among the figure.For shortening the start-up time of unit, the utility model has been cancelled the throttling orifice plate on the high pressure main steam heating coil passage 8.Before steam turbine did not start after the combustion machine starts, the steam that the height of waste heat boiler, medium voltage network produce was back to condenser 5 through high pressure turbine by 71, intermediate pressure by-pass 61 respectively.Apart from the high pressure main inlet throttle-stop valve certain distance is arranged because high pressure turbine by 71 is arranged, even if when high pressure turbine by 71 is opened, the working medium before the high pressure main inlet throttle-stop valve does not circulate yet, and its temperature is difficult to satisfy steam turbine red switch requirement.Therefore dispose the circulation that the heating coil passage guarantees high pressure main inlet throttle-stop valve and the preceding working medium of intermediate pressure main stop valve in the prior art.When unit starting initial stage steam turbine red switch band bypass when operation, a part of high pressure main steam flow to condenser through the heating coil passage to middle pressure main steam line and through intermediate pressure by-pass.But in the prior art, receive the restriction of the throttling orifice plate on the heating coil passage, it is slower that high pressure main steam velocity of liquid assets causes temperature to rise more slowly, waits for that the time of steam turbine red switch condition is longer.The utility model has been cancelled throttling orifice plate, and has designed the steering logic that the heating coil valve is closed in the high time protection of middle pressure main steam line pressure, makes the steam turbine red switch condition time shorten to 39 minutes from 75 minutes.
More than describe the preferred embodiment of the utility model in detail.Should be appreciated that those of ordinary skill in the art need not creative work and just can make many modifications and variation according to the design of the utility model.Therefore, all technician in the art according to the design of the utility model on the basis of existing technology through the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in determined protection domain by claims.
Claims (9)
1. a key start and stop control system of a combustion and steam Combined Cycle Unit, said Combined Cycle Unit comprise combustion machine and combustion machine backup system, steam turbine and steam turbine backup system at least, also comprise waste heat boiler, BOP system and synergic system; It is characterized in that: a said key start and stop control system covers said combustion machine and combustion machine backup system, said steam turbine and steam turbine backup system, said waste heat boiler, said BOP system and said synergic system; A said key start and stop control system is the step control structure, is followed successively by unit cooperative level control module, son group level control module and device level control module by the upper strata toward lower floor.
2. a key start and stop control system as claimed in claim 1 is characterized in that: the condensate calorifier inlets place at said waste heat boiler is provided with bypass Electrically operated gate and small-bore pipeline.
3. a key start and stop control system as claimed in claim 1; It is characterized in that: in the condensate system of said waste heat boiler; The water filling door of said condensate system is an Electrically operated gate, and to each user's house steward, the female pipe of user Electrically operated gate is set in said condensate system.
4. a key start and stop control system as claimed in claim 1; It is characterized in that: the start-up control of a said key start and stop control system comprises that successively subsidiary engine starts in the said BOP system; The last water of said waste heat boiler, the startup of said combustion machine is incorporated into the power networks, and bypath system cooperates said waste heat boiler increasing temperature and pressure; The red switch of said steam turbine, warming-up and be incorporated into the power networks, said Combined Cycle Unit according to the operating mode of boiler and steam turbine by the given pace load up to basic load.
5. a key start and stop control system as claimed in claim 1; It is characterized in that: the inactive control of a said key start and stop control system comprises that successively the Reduction of Students' Study Load lotus is to the minimum aperture of the entry guide vane IGV of said combustion machine; Said steam turbine is shut down; Continue the minimum load of Reduction of Students' Study Load lotus to said Combined Cycle Unit, said combustion machine is shut down, and the subsidiary engine of said BOP system is shut down.
6. a key start and stop control system as claimed in claim 1 is characterized in that: all adopt branched structure and/or redirect structure in said unit cooperative level control module, the said son group level control module.
7. a key start and stop control system as claimed in claim 1 is characterized in that: in the suitable control logic of said unit cooperative level control module, son group level control module bypass structure is set all.
8. a key start and stop control system as claimed in claim 1 is characterized in that: said son group level control module comprises B of Unit OP control module, combustion machine control module, steam turbine control module, the control of HRSG boiler circuit, synergic system control module.
9. a key start and stop control system as claimed in claim 1 is characterized in that: a said key start and stop control system also comprises intelligent alarm system.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203491384U CN202230373U (en) | 2011-09-16 | 2011-09-16 | Automatic power plant start up & shut down system of gas-steam combined cycle unit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011203491384U CN202230373U (en) | 2011-09-16 | 2011-09-16 | Automatic power plant start up & shut down system of gas-steam combined cycle unit |
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| CN202230373U true CN202230373U (en) | 2012-05-23 |
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| CN2011203491384U Expired - Lifetime CN202230373U (en) | 2011-09-16 | 2011-09-16 | Automatic power plant start up & shut down system of gas-steam combined cycle unit |
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| CN (1) | CN202230373U (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102393688A (en) * | 2011-09-16 | 2012-03-28 | 上海申能临港燃机发电有限公司 | One-key start-stop control system for fuel gas and steam combined cycle unit |
| CN103439932A (en) * | 2013-08-12 | 2013-12-11 | 国家电网公司 | Method for increasing and decreasing breaking points in operation of automatic starting and stopping control system of thermal power generating unit |
| CN104033197A (en) * | 2013-03-06 | 2014-09-10 | 阿尔斯通技术有限公司 | Method for starting-up and operating a combined-cycle power plant |
| EP2775106A1 (en) | 2013-03-06 | 2014-09-10 | Alstom Technology Ltd | Method for operating a combined-cycle power plant |
| CN107976980A (en) * | 2017-11-25 | 2018-05-01 | 国网辽宁省电力有限公司电力科学研究院 | Large-scale phase modifier DCS controls start ＆ shutdown through one key system and method |
| CN110825050A (en) * | 2019-11-14 | 2020-02-21 | 南京国电南自维美德自动化有限公司 | Automatic start-stop control system and control method for F-grade gas-steam combined cycle system |
| CN112664283A (en) * | 2020-12-23 | 2021-04-16 | 上海电气电站设备有限公司 | Turbine automatic start-stop sequential control method, ultra-supercritical turbine unit and method thereof |
| CN114076006A (en) * | 2021-11-09 | 2022-02-22 | 国电投周口燃气热电有限公司 | Generating set intelligence opens and stops system based on APS controller |
| CN115031255A (en) * | 2022-06-24 | 2022-09-09 | 新地能源工程技术有限公司 | Flue gas recycling device of micro-gas turbine combined heat and power generation system |
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| CN102393688B (en) * | 2011-09-16 | 2015-03-18 | 上海申能临港燃机发电有限公司 | One-key start-stop control system for fuel gas and steam combined cycle unit |
| CN102393688A (en) * | 2011-09-16 | 2012-03-28 | 上海申能临港燃机发电有限公司 | One-key start-stop control system for fuel gas and steam combined cycle unit |
| US9631521B2 (en) | 2013-03-06 | 2017-04-25 | General Electric Technology Gmbh | Method for operating a combined-cycle power plant |
| US10072532B2 (en) | 2013-03-06 | 2018-09-11 | General Electric Technology Gmbh | Method for starting-up and operating a combined-cycle power plant |
| EP2775107A1 (en) | 2013-03-06 | 2014-09-10 | Alstom Technology Ltd | Method for starting-up and operating a combined-cycle power plant |
| EP2799671A2 (en) | 2013-03-06 | 2014-11-05 | Alstom Technology Ltd | Method for starting-up and operating a combined-cycle power plant |
| CN104033197A (en) * | 2013-03-06 | 2014-09-10 | 阿尔斯通技术有限公司 | Method for starting-up and operating a combined-cycle power plant |
| EP2775106A1 (en) | 2013-03-06 | 2014-09-10 | Alstom Technology Ltd | Method for operating a combined-cycle power plant |
| CN103439932B (en) * | 2013-08-12 | 2015-09-23 | 国家电网公司 | Fired power generating unit automatic start-stop control system increases and decreases the method for breakpoint in running |
| CN103439932A (en) * | 2013-08-12 | 2013-12-11 | 国家电网公司 | Method for increasing and decreasing breaking points in operation of automatic starting and stopping control system of thermal power generating unit |
| CN107976980A (en) * | 2017-11-25 | 2018-05-01 | 国网辽宁省电力有限公司电力科学研究院 | Large-scale phase modifier DCS controls start ＆ shutdown through one key system and method |
| CN110825050A (en) * | 2019-11-14 | 2020-02-21 | 南京国电南自维美德自动化有限公司 | Automatic start-stop control system and control method for F-grade gas-steam combined cycle system |
| CN112664283A (en) * | 2020-12-23 | 2021-04-16 | 上海电气电站设备有限公司 | Turbine automatic start-stop sequential control method, ultra-supercritical turbine unit and method thereof |
| CN114076006A (en) * | 2021-11-09 | 2022-02-22 | 国电投周口燃气热电有限公司 | Generating set intelligence opens and stops system based on APS controller |
| CN114076006B (en) * | 2021-11-09 | 2024-06-28 | 国电投周口燃气热电有限公司 | Generator set intelligent start-stop system based on APS controller |
| CN115031255A (en) * | 2022-06-24 | 2022-09-09 | 新地能源工程技术有限公司 | Flue gas recycling device of micro-gas turbine combined heat and power generation system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120523 |