CN117287272A - Control method for auxiliary system of combined cycle unit for responding to load demand of power grid - Google Patents
Control method for auxiliary system of combined cycle unit for responding to load demand of power grid Download PDFInfo
- Publication number
- CN117287272A CN117287272A CN202311253248.4A CN202311253248A CN117287272A CN 117287272 A CN117287272 A CN 117287272A CN 202311253248 A CN202311253248 A CN 202311253248A CN 117287272 A CN117287272 A CN 117287272A
- Authority
- CN
- China
- Prior art keywords
- water
- starting
- model
- pump
- circulating water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 212
- 239000000498 cooling water Substances 0.000 claims description 39
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 230000001502 supplementing effect Effects 0.000 claims description 15
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 125000000524 functional group Chemical group 0.000 claims description 7
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 238000005457 optimization Methods 0.000 claims description 4
- 230000003068 static effect Effects 0.000 claims description 4
- 230000004044 response Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 description 74
- 239000000243 solution Substances 0.000 description 4
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K13/00—General layout or general methods of operation of complete plants
- F01K13/02—Controlling, e.g. stopping or starting
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Feedback Control In General (AREA)
Abstract
The invention discloses a control method of an auxiliary system of a combined cycle unit for responding to power grid load demands, which relates to the technical field of intelligent control of gas-steam combined cycle units. The invention utilizes the control method of the model to intelligently and reasonably start the circulating water system, the open water system and the condensate system in a linkage and coordination way, realizes the comprehensive and reasonable starting of the auxiliary system, realizes the flexible and efficient starting of the auxiliary system as a main line, and realizes the efficient and safe starting operation of the gas-steam combined cycle unit.
Description
Technical Field
The invention relates to the technical field of intelligent control of a gas-steam combined cycle unit, in particular to a control method of an auxiliary system of a combined cycle unit responding to power grid load demands.
Background
In recent decades, with the rapid development of the power industry in China and the transition of the economic situation in China, as a thermal power plant which plays the dominant role in the conventional power industry, the installed capacity of the thermal power plant is gradually reduced, and the installed capacity of clean energy units such as wind power, solar energy, photo-heat and the like is continuously increased at a growing speed.
The following problems exist in the prior art:
along with the increase of the capacity of the clean energy unit, the wind rejection rate, the light rejection rate and the water rejection rate are continuously increased year by year, and in order to further reduce the light rejection rate, the wind rejection rate and the water rejection rate in the power grid, the power grid can be ensured to run safely and stably according to the current-stage power supply structure in the power grid, the gas-steam combined cycle unit is required to have the capability of responding to the load demand of the power grid in time, and the safe and rapid starting operation of the gas-steam combined cycle unit is ensured to be capable of rising to full load at any time. The requirements bring great tests to an auxiliary system of the gas-steam combined cycle unit, and the auxiliary system is required to be stable and safe in the whole process.
Disclosure of Invention
The invention provides a control method of an auxiliary system of a combined cycle unit for responding to the load demand of a power grid, so as to solve the problems in the background technology.
In order to solve the technical problems, the invention adopts the following technical scheme:
according to the control method of the auxiliary system of the combined cycle unit responding to the power grid load demand, the optimal starting coordination mode of the circulating water system, the closed water system, the open water system and the condensed water system is found through big data combined data optimization, various requirements of the auxiliary system of the steam turbine in the gas-steam combined cycle unit are met, an important foundation is laid for starting subsequent main equipment, safe and efficient starting of the unit is finally achieved, and meanwhile the load demand of the power grid side responding to the current deep peak shaving background is met.
The technical scheme of the invention is further improved as follows: the starting meeting condition of the circulating water system linkage matching model is as follows: no. 1, no. 2 and No. 3 circulating water pumps stop running to liquid level is less than 3.2m behind the No. 1 flat screen.
The technical scheme of the invention is further improved as follows: the starting of the circulating water system linkage coordination model comprises the following steps:
a1: opening a circulating water passage and performing static pressure water injection;
a2: after the automatic water injection of the model is completed, closing an outlet valve of the circulating pump;
a3: starting a model pre-selected circulating water pump;
a4: starting the circulating water pump to control in sequence;
a5: closing an outlet hydraulic butterfly valve of the No. 1 circulating water pump;
a6: opening a hydraulic butterfly valve at an outlet of the No. 1 circulating water pump to a 15-degree position;
a7: setting the frequency of the frequency converter to be 35Hz, and directly skipping the step by setting the power frequency;
a8: the breaker state of the circulating water pump of switch-on No. 1;
a9: the position of a breaker of the circulating water pump for closing the valve 1;
a10: starting the No. 1 circulating water pump frequency converter, and directly skipping to the next step when the power frequency is high;
a11: the outlet hydraulic butterfly valve of the No. 1 circulating water pump is in a full-open state;
a12: performing water injection work, and directly skipping to the next step when the water injection work is not performed at the first station;
a13: setting the variable frequency rotating speed of the No. 1 circulating water pump to be controlled to be in an automatic state, and skipping to the next step when the variable frequency rotating speed is in a power frequency state;
a14: the model checks whether each work of the circulating water pump is successfully completed;
a15: putting into a circulating water pump for standby.
The technical scheme of the invention is further improved as follows: the open water system linkage fit model motion meeting conditions are as follows: the circulating water system linkage matching model is started.
The technical scheme of the invention is further improved as follows: the starting of the open water system linkage coordination model comprises the following steps:
b1: opening a valve associated with the open water user side;
b2: the outlet electric shut-off valve of the open water heat exchanger is opened.
The technical scheme of the invention is further improved as follows: the closed cooling water system linkage cooperation model starting meeting conditions are as follows: the closed cooling water filling is not started and the closed cooling water functional group is not completed.
The technical scheme of the invention is further improved as follows: the starting of the closed cooling water system linkage matching model comprises the following steps:
c1: calling a cold water closing and filling functional group;
c2: opening outlet valves of three closed water pumps;
and C3: opening and closing an inlet valve of a cooling water system of a cold water user;
and C4: setting the expansion tank water supplementing regulating valve at the minimum opening;
c5: the model observation shows that the rear water level is at a large opening;
c6: setting a regulating valve automatically after water filling is completed;
c7: the closed expansion tank water supplementing regulating valve is set in a setting state;
and C8: an inlet valve for opening and closing cooling water of a cold water user;
c9: preselecting a setting function of a closed water inlet and outlet valve of the cooler;
c10: closing an outlet valve of the closed cooling water pump;
c11: starting a closed cooling water pump;
and C12: putting the closed cooling water pump in a standby state.
The technical scheme of the invention is further improved as follows: the starting meeting condition of the linkage coordination model of the condensation water system is as follows: the No. 1 condensate pump is not operated, and the No. 1 condensate pump does not meet the protection tripping condition.
The technical scheme of the invention is further improved as follows: the starting of the condensation water system linkage matching model comprises the following steps:
d1: opening an inlet valve and an outlet valve of a No. 1 condensate pump;
d2: setting the starting rotating speed of the condensate pump frequency converter, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
d3: closing a No. 1 condensate pump isolating switch;
d4: closing a No. 1 condensate pump;
d5: starting a condensate pump frequency converter, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
d6: opening an outlet valve of a No. 1 condensate pump;
d7: setting the rotation speed control of the condensate pump frequency converter automatically, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
d8: checking whether the condensate system is operating normally.
By adopting the technical scheme, compared with the prior art, the invention has the following technical progress:
1. the invention provides a control method of an auxiliary system of a combined cycle unit for responding to the load demand of a power grid, which is characterized in that the control method of a model is utilized to intelligently and reasonably start a circulating water system, an open water system and a condensate water system in a linkage and matching way, so that the auxiliary system is comprehensively and reasonably started in a coordinated way, the auxiliary system is flexibly and efficiently started as a main line, and the efficient and safe starting operation of a gas-steam combined cycle unit is realized.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is further illustrated by the following examples:
example 1
As shown in FIG. 1, the invention provides a control method of an auxiliary system of a combined cycle unit for responding to the load demand of a power grid, and the control method of the auxiliary system of the combined cycle unit for responding to the load demand of the power grid finds the optimal starting coordination mode of a circulating water system, a closed water system, an open water system and a condensation water system through big data combined data optimization, meets various requirements of a turbine auxiliary system in a gas-steam combined cycle unit, lays an important foundation for the starting of subsequent main equipment, finally realizes the safe and efficient starting of the unit, and meets the load demand of a response power grid side under the current deep peak regulation background.
In the embodiment, the combined cycle unit auxiliary system utilizes the control method of the model to intelligently and reasonably start the circulating water system, the open water system and the condensate water system in a linkage and cooperation mode, realizes the comprehensive and reasonable starting of the auxiliary system, saves time, timely responds to the requirement of the power grid load, optimizes the operation mode of the high-power auxiliary machine to the maximum extent, realizes the full-automatic starting and stopping of the auxiliary machine, simultaneously optimizes the operation economy of the main auxiliary machine, and simultaneously analyzes from the angle of the whole plant, and gives consideration to the optimization monitoring of the operation of the starting boiler and the public system before the unit is started and after the unit is stopped.
Example 2
As shown in fig. 1, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the starting condition of the circulating water system linkage matching model is as follows: no. 1, no. 2 and No. 3 circulating water pump stop operation to liquid level is less than 3.2m behind the flat filter screen of No. 1, and the start-up of circulating water system linkage cooperation model includes following steps:
a1: opening a circulating water passage and performing static pressure water injection;
the model sends out an action instruction: and the water inlet and outlet valves of the circulating water on the side A and the side B of the condenser are respectively provided with an outlet hydraulic butterfly valve of the circulating water pump of No. 1, no. 2 and No. 3.
The model receives feedback actions: the circulating waterway is smooth (comprising No. 1 to No. 10 cooling tower water inlet electric doors, and the model automatically selects to open corresponding water inlet doors and condenser water inlet and outlet valves according to the running state of the model); the outlet hydraulic butterfly valves of the No. 1, no. 2 and No. 3 circulating water pumps are fully opened; the model automatically confirms that the static water injection is finished, or the time delay is 30 minutes after the operation of the first circulating water pump is finished.
A2: after the automatic water injection of the model is completed, closing an outlet valve of the circulating pump;
the model sends out an action instruction: and closing the hydraulic butterfly valve at the outlet of the No. 1 and No. 2 circulating water pumps and the No. 3 circulating water pumps.
The model receives feedback actions: the model receives that the outlet hydraulic butterfly valves of the No. 1 and No. 2 circulating water pumps and the No. 3 circulating water pumps are all closed.
A3: starting a model pre-selected circulating water pump;
the model sends out an action instruction: and calling a preselected circulating water pump to start sequential control.
The model receives feedback actions: the circulation water pump is started to successfully control the command.
A4: starting the circulating water pump to control in sequence;
the model sends out an action instruction: it is checked whether the start-up operating conditions are met.
The model receives feedback actions: the operation of the first circulating water pump is completed, or the circulating water and the waterway of the mechanical tower are smooth.
A5: closing an outlet hydraulic butterfly valve of the No. 1 circulating water pump;
the model sends out an action instruction: and the model gives an instruction for closing the outlet hydraulic butterfly valve of the No. 1 circulating water pump.
The model receives feedback actions: the outlet hydraulic butterfly valve of the No. 1 circulating water pump is positioned at the fully closed position.
A6: opening a hydraulic butterfly valve at an outlet of the No. 1 circulating water pump to a 15-degree position;
the model sends out an action instruction: and the model gives a command of stopping after opening the 15-degree position of the outlet hydraulic butterfly valve of the No. 1 circulating water pump.
The model receives feedback actions: the outlet hydraulic butterfly valve of the No. 1 circulating water pump is positioned at a 15-degree position, or the operation of the first circulating water pump is completed.
A7: setting the frequency of the frequency converter to be 35Hz, and directly skipping the step by setting the power frequency;
the model sends out an action instruction: the model is issued to set the speed of the frequency converter of the No. 1 circulating water pump to be 35Hz, and the next step is skipped when the model is in the power frequency state.
The model receives feedback actions: the rotating speed of the No. 1 circulating water pump is between 32Hz and 38Hz, or in the working state of power frequency at the moment.
A8: the breaker state of the circulating water pump of switch-on No. 1;
the model sends out an action instruction: and the model is arranged at the switch positions of the frequency converters K1 and K2 of the circulating water pump of the switch-on number 1 and the switch position of the switch-off number K3.
The model receives feedback actions: the No. 1 circulating water pump frequency converter K1 is in a closing state, the K2 is in a closing state, and the No. 1 circulating water pump frequency converter K3 is in a separating brake state.
A9: the position of a breaker of the circulating water pump for closing the valve 1;
the model sends out an action instruction: and the model issues a command for checking whether the switch position of the circuit breaker of the No. 1 circulating water pump is in a closing state.
The model receives feedback actions: the power supply of the No. 1 circulating water pump is already at a closing position.
A10: starting the No. 1 circulating water pump frequency converter, and directly skipping to the next step when the power frequency is high;
the model sends out an action instruction: and the model issues a command for checking whether the switch position of the frequency converter of the No. 1 circulating water pump is in a closing state.
The model receives feedback actions: the No. 1 circulating water pump frequency converter is already in a closing position or is already in a power frequency state.
A11: the outlet hydraulic butterfly valve of the No. 1 circulating water pump is in a full-open state;
the model sends out an action instruction: and the model issues a command of fully opening the hydraulic butterfly valve at the outlet of the No. 1 circulating water pump.
The model receives feedback actions: the outlet hydraulic butterfly valve of the No. 1 circulating water pump is in a fully opened state, or the operation of the first circulating water pump is completed.
A12: performing water injection work, and directly skipping to the next step when the water injection work is not performed at the first station;
the model sends out an action instruction: and the model issues a command of fully opening the hydraulic butterfly valve at the outlet of the No. 1 circulating water pump.
The model receives feedback actions: the outlet hydraulic butterfly valve of the No. 1 circulating water pump is in a fully opened state, or the operation of the first circulating water pump is completed.
A13: setting the variable frequency rotating speed of the No. 1 circulating water pump to be controlled to be in an automatic state, and skipping to the next step when the variable frequency rotating speed is in a power frequency state;
the model sends out an action instruction: and the model issues a command for setting the variable-frequency rotating speed control of the No. 1 circulating water pump to be automatic.
The model receives feedback actions: the frequency conversion control of the No. 1 circulating water pump frequency converter is in an automatic state at the moment.
A14: the model checks whether each work of the circulating water pump is successfully completed;
the model sends out an action instruction: and the model issues commands for checking various works of the circulating water pump.
The model receives feedback actions: the power supply of the circulating water pump is in a closing position, the circulating water pump operates, the hydraulic butterfly valve at the outlet of the circulating water pump is in a full-open state, and the frequency conversion control of the frequency converter of the circulating water pump is in an automatic state. The model receives that the pre-selection circulating water pump is started and the sequential control is completed, and the circulating water pumps No. 1, no. 2 and No. 3 are started and the sequential control is completed.
A15: putting into a circulating water pump for standby.
The model sends out an action instruction: putting into a circulating water pump for standby.
The model receives feedback actions: the circulating water pump is put into operation for standby.
Example 3
As shown in fig. 1, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the starting condition of the open water system linkage coordination model is as follows: the circulating water system linkage matching model is started, and the starting of the open water system linkage matching model comprises the following steps:
b1: opening a valve associated with the open water user side;
the model sends out an action instruction: the model issues instructions to open all valves on the open water user side.
The model receives feedback actions: the model receives a feedback signal that the open water user valve has been fully opened.
B2: the outlet electric shut-off valve of the open water heat exchanger is opened.
The model sends out an action instruction: the model sends out an instruction of opening the electric shutoff valve of the outlet of the open water heat exchanger.
The model receives feedback actions: the outlet electric shut-off valve of the heat exchanger is already in an open state.
Example 4
As shown in fig. 1, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the starting condition of the linkage coordination model of the closed cooling water system is as follows: the closed cooling water filling is not started and the closed cooling water functional group is not completed, and the starting of the closed cooling water system linkage matching model comprises the following steps:
c1: calling a cold water closing and filling functional group;
the model sends out an action instruction: two closed cooling water outlet valves of the closed cooler are opened.
The model receives feedback actions: the two water-water heat exchangers are in an opened state when the electric shut-off valve of the cold water outlet is closed.
C2: opening outlet valves of three closed water pumps;
the model sends out an action instruction: the model sends out an instruction for opening the outlet valve of the No. 1 closed water pump, the No. 2 closed water pump and the No. 3 closed water pump.
The model receives feedback actions: the model receives that the outlet valves of the No. 1 and No. 2 closed water pumps and the No. 3 closed water pumps are in an opened state.
And C3: opening and closing an inlet valve of a cooling water system of a cold water user;
the model sends out an action instruction: and the model gives an opening instruction of the electric valve of the water communicating pipe for closed circulation of cooling water.
The model receives feedback actions: the closed circulation cooling water inlet and outlet water communicating pipe electric valve is successfully opened.
And C4: setting the expansion tank water supplementing regulating valve at the minimum opening;
the model sends out an action instruction: the valve position of the normal water supplementing electric regulating valve of the closed cold water tank is smaller than 40%, and the valve position opening of the normal water supplementing electric regulating valve of the closed cold water tank is increased to 30%.
The model receives feedback actions: the liquid level of the closed circulation expansion water tank is more than 800mm, and the pressure of the main pipe at the outlet of the closed cooling water pump is less than 0.05MPa.
C5: the model observation shows that the rear water level is at a large opening;
the model sends out an action instruction: when the valve position of the normal water supplementing electric regulating valve of the closed cold water tank is smaller than 40%, the instruction that the valve position opening of the normal water supplementing electric regulating valve of the closed cold water tank is increased to 40% is set under the model.
The model receives feedback actions: the liquid level of the closed circulation expansion water tank is more than 1000mm, and the pressure of the main pipe at the outlet of the closed cooling water pump is more than 0.1MPa.
C6: setting a regulating valve automatically after water filling is completed;
the model sends out an action instruction: and the model gives an automatic command for opening and closing the normal water supplementing and regulating valve position opening of the cold water tank to 10 percent.
The model receives feedback actions: the valve position of the normal water supplementing regulating valve of the closed cold water tank is smaller than 8%, and the normal water supplementing regulating valve of the closed cold water tank is in an automatic state, so that the closed cooling water filling functional group is completed.
C7: the closed expansion tank water supplementing regulating valve is set in a setting state;
the model sends out an action instruction: the normal water supplementing and adjusting valve of the closed cold water tank is automatically arranged.
The model receives feedback actions: the normal water supplementing and adjusting valve of the closed-loop water tank is automatically arranged, and the liquid level of the closed-loop circulating expansion water tank is more than 800mm.
And C8: an inlet valve for opening and closing cooling water of a cold water user;
the model sends out an action instruction: the model gives an instruction for opening the closed circulating cooling water and the electric valve of the backwater communicating pipe.
The model receives feedback actions: the closed circulation cooling water inlet and return water communicating pipe electric valve is fully opened.
C9: preselecting a setting function of a closed water inlet and outlet valve of the cooler;
the model sends out an action instruction: and the model gives a command for opening and pre-selecting a closed water inlet and outlet valve of the cooler.
The model receives feedback actions: the working position cold shut-off device selects a No. 1 path, and the electric shut-off valve of the cold water outlet of the No. 1 water-water heat exchanger is fully opened; or the working position cold-closing device selects a No. 2 path, and the No. 2 water-water heat exchanger closes the electric shut-off valve of the cold water outlet.
C10: closing an outlet valve of the closed cooling water pump;
the model sends out an action instruction: and the model sends a command of closing the electric shut-off valve of the outlets of the cooling water pumps No. 1 and No. 2.
The model receives feedback actions: the electric shutoff valves of the outlets of the No. 1 and No. 2 cooling water pumps are in a closed state.
C11: starting a closed cooling water pump;
the model sends out an action instruction: and the model issues a command for starting the preselected closed water pump to start sequential control.
The model receives feedback actions: the preselected closed water pump is successfully started.
And C12: putting the closed cooling water pump in a standby state.
The model sends out an action instruction: and (5) issuing a command for putting the closed cooling water pump into standby by the model.
The model receives feedback actions: the closed cooling water pump is put into operation for standby.
Example 5
As shown in fig. 1, on the basis of embodiment 1, the present invention provides a technical solution: preferably, the starting condition of the linkage coordination model of the condensation water system is as follows: the No. 1 condensate pump is not operated, and the No. 1 condensate pump does not meet the protection tripping condition, and the starting of the condensate system linkage cooperation model comprises the following steps:
d1: opening an inlet valve and an outlet valve of a No. 1 condensate pump;
the model sends out an action instruction: and closing the electric shutoff valve of the inlet and outlet of the No. 1 condensate pump.
The model receives feedback actions: and the inlet and outlet electric shutoff valves of the No. 1 condensate pump are fully closed, or the condensate pump is ready for use.
D2: setting the starting rotating speed of the condensate pump frequency converter, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
the model sends out an action instruction: the model sends out a command for setting the frequency of the speed of the No. 1 condensate pump frequency converter to be 20 Hz.
The model receives feedback actions: the model receives that the speed running frequency of the No. 1 condensate pump frequency converter is greater than 18Hz, or the No. 1 condensate pump is in a power frequency state at the moment.
D3: closing a No. 1 condensate pump isolating switch;
the model sends out an action instruction: and the model gives instructions for switching on the condensate pump frequency converters K1 and K2 and instructions for switching off the switch K3.
The model receives feedback actions: the condensate pump frequency converters K1 and K2 are switched on and the switch K3 is switched off.
D4: closing a No. 1 condensate pump;
the model sends out an action instruction: and closing the No. 1 condensate pump.
The model receives feedback actions: the No. 1 condensate pump is already at the closing position.
D5: starting a condensate pump frequency converter, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
the model sends out an action instruction: and the model gives an instruction for starting the condensate pump frequency converter.
The model receives feedback actions: the condensate pump operates in variable frequency, or the condensate pump No. 1 is in a power frequency state.
D6: opening an outlet valve of a No. 1 condensate pump;
the model sends out an action instruction: and the model gives an instruction of opening an electric shutoff valve of the outlet of the No. 1 condensate pump.
The model receives feedback actions: the electric shutoff valve of the No. 1 condensate pump outlet is in a full-open position.
D7: setting the rotation speed control of the condensate pump frequency converter automatically, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
the model sends out an action instruction: setting the variable-frequency rotating speed of the condensate pump to be controlled to be in an automatic state.
The model receives feedback actions: the variable frequency control of the condensate pump is in an automatic state, or the condensate pump No. 1 is at the power frequency.
D8: checking whether the condensate system is operating normally.
The model sends out an action instruction: the model issues a command to check whether the condensate pump No. 1 is running (variable frequency or power frequency).
The model receives feedback actions: the electric shutoff valve of the No. 1 condensate pump outlet is in a full-open position.
The foregoing invention has been generally described in great detail, but it will be apparent to those skilled in the art that modifications and improvements can be made thereto. Accordingly, it is intended to cover modifications or improvements within the spirit of the inventive concepts.
Claims (9)
1. The control method of the auxiliary system of the combined cycle unit for responding to the load demand of the power grid is characterized by comprising the following steps of: according to the control method for the auxiliary system of the combined cycle unit responding to the power grid load demand, the optimal starting coordination mode of the circulating water system, the closed water system, the open water system and the condensate water system is found through the big data combined data optimization, so that various demands of the auxiliary system of the steam turbine in the gas-steam combined cycle unit are met, an important foundation is laid for starting subsequent main equipment, safe and efficient starting of the unit is finally realized, and meanwhile, the load demand of the response power grid side under the current deep peak regulation background is met.
2. The combined cycle unit auxiliary system control method responsive to grid load demand of claim 1, wherein: the starting meeting condition of the circulating water system linkage matching model is as follows: no. 1, no. 2 and No. 3 circulating water pumps stop running to liquid level is less than 3.2m behind the No. 1 flat screen.
3. The combined cycle unit auxiliary system control method responsive to grid load demand of claim 2, wherein: the starting of the circulating water system linkage coordination model comprises the following steps:
a1: opening a circulating water passage and performing static pressure water injection;
a2: after the automatic water injection of the model is completed, closing an outlet valve of the circulating pump;
a3: starting a model pre-selected circulating water pump;
a4: starting the circulating water pump to control in sequence;
a5: closing an outlet hydraulic butterfly valve of the No. 1 circulating water pump;
a6: opening a hydraulic butterfly valve at an outlet of the No. 1 circulating water pump to a 15-degree position;
a7: setting the frequency of the frequency converter to be 35Hz, and directly skipping the step by setting the power frequency;
a8: the breaker state of the circulating water pump of switch-on No. 1;
a9: the position of a breaker of the circulating water pump for closing the valve 1;
a10: starting the No. 1 circulating water pump frequency converter, and directly skipping to the next step when the power frequency is high;
a11: the outlet hydraulic butterfly valve of the No. 1 circulating water pump is in a full-open state;
a12: performing water injection work, and directly skipping to the next step when the water injection work is not performed at the first station;
a13: setting the variable frequency rotating speed of the No. 1 circulating water pump to be controlled to be in an automatic state, and skipping to the next step when the variable frequency rotating speed is in a power frequency state;
a14: the model checks whether each work of the circulating water pump is successfully completed;
a15: putting into a circulating water pump for standby.
4. The combined cycle unit auxiliary system control method responsive to grid load demand of claim 1, wherein: the open water system linkage fit model motion meeting conditions are as follows: the circulating water system linkage matching model is started.
5. The combined cycle unit auxiliary system control method responsive to grid load demand of claim 4, wherein: the starting of the open water system linkage coordination model comprises the following steps:
b1: opening a valve associated with the open water user side;
b2: the outlet electric shut-off valve of the open water heat exchanger is opened.
6. The combined cycle unit auxiliary system control method responsive to grid load demand of claim 1, wherein: the closed cooling water system linkage cooperation model starting meeting conditions are as follows: the closed cooling water filling is not started and the closed cooling water functional group is not completed.
7. The combined cycle unit auxiliary system control method responsive to grid load demand of claim 6, wherein: the starting of the closed cooling water system linkage matching model comprises the following steps:
c1: calling a cold water closing and filling functional group;
c2: opening outlet valves of three closed water pumps;
and C3: opening and closing an inlet valve of a cooling water system of a cold water user;
and C4: setting the expansion tank water supplementing regulating valve at the minimum opening;
c5: the model observation shows that the rear water level is at a large opening;
c6: setting a regulating valve automatically after water filling is completed;
c7: the closed expansion tank water supplementing regulating valve is set in a setting state;
and C8: an inlet valve for opening and closing cooling water of a cold water user;
c9: preselecting a setting function of a closed water inlet and outlet valve of the cooler;
c10: closing an outlet valve of the closed cooling water pump;
c11: starting a closed cooling water pump;
and C12: putting the closed cooling water pump in a standby state.
8. The combined cycle unit auxiliary system control method responsive to grid load demand of claim 1, wherein: the starting meeting condition of the linkage coordination model of the condensation water system is as follows: the No. 1 condensate pump is not operated, and the No. 1 condensate pump does not meet the protection tripping condition.
9. The combined cycle unit auxiliary system control method responsive to grid load demand of claim 8, wherein: the starting of the condensation water system linkage matching model comprises the following steps:
d1: opening an inlet valve and an outlet valve of a No. 1 condensate pump;
d2: setting the starting rotating speed of the condensate pump frequency converter, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
d3: closing a No. 1 condensate pump isolating switch;
d4: closing a No. 1 condensate pump;
d5: starting a condensate pump frequency converter, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
d6: opening an outlet valve of a No. 1 condensate pump;
d7: setting the rotation speed control of the condensate pump frequency converter automatically, and skipping to the next step when the condensate pump frequency converter is in a power frequency state;
d8: checking whether the condensate system is operating normally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311253248.4A CN117287272A (en) | 2023-09-27 | 2023-09-27 | Control method for auxiliary system of combined cycle unit for responding to load demand of power grid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311253248.4A CN117287272A (en) | 2023-09-27 | 2023-09-27 | Control method for auxiliary system of combined cycle unit for responding to load demand of power grid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117287272A true CN117287272A (en) | 2023-12-26 |
Family
ID=89251356
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311253248.4A Pending CN117287272A (en) | 2023-09-27 | 2023-09-27 | Control method for auxiliary system of combined cycle unit for responding to load demand of power grid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117287272A (en) |
-
2023
- 2023-09-27 CN CN202311253248.4A patent/CN117287272A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107120981B (en) | High back pressure heat supply working condition abnormal control system with on-line monitoring and closed loop adjustment | |
| CN109441560A (en) | A kind of expansion power generator air admittance regulation system and method | |
| CN111561440A (en) | High efficiency air compressor machine unit control system | |
| CN114446503A (en) | System of integrated small reactor nuclear power unit and reactor operation method | |
| CN113638776B (en) | Steam extraction back pressure type steam turbine thermodynamic system and control method thereof | |
| WO2022247037A1 (en) | Variable-speed constant-frequency compressed air energy storage peak shaving system and method | |
| CN110130436B (en) | Intelligent water energy circulation power-saving system | |
| CN110714804B (en) | Bypass control system suitable for CAES system expansion unit | |
| CN210179286U (en) | Novel electric control system for fan bearing bush lubricating thin oil station | |
| CN117287272A (en) | Control method for auxiliary system of combined cycle unit for responding to load demand of power grid | |
| CN209228417U (en) | A kind of expansion power generator air admittance regulation system | |
| CN101497086A (en) | High-pressure water descaling system | |
| CN114150728B (en) | Circulation water supply system | |
| CN110597173B (en) | Main transformer cooling control method | |
| CN217814018U (en) | Energy-saving closed pump cooling water driving system | |
| CN201671667U (en) | Turbine hot well water level control device | |
| CN214118272U (en) | Steam turbine low pressure jar water injection system of thermal power plant | |
| CN210692296U (en) | Main transformer cooling control system | |
| CN217440120U (en) | Steam power vacuum pumping system | |
| CN219317016U (en) | Auxiliary condensate pump equipment for saving energy of turbine condensate system | |
| CN111498948B (en) | Photovoltaic multi-stage composite thermal storage water purification system and control method thereof | |
| CN217712693U (en) | Standby driving device for small heat supply steam turbine | |
| CN220622174U (en) | High-efficiency water ring vacuum pump unit | |
| CN215676546U (en) | Novel indirect air cooling tower emergency water draining device | |
| CN209942893U (en) | Latent heat recovery system for exhaust vaporization of steam turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |