CN117386511A - TCA cooling water control method and system - Google Patents
TCA cooling water control method and system Download PDFInfo
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- CN117386511A CN117386511A CN202311228611.7A CN202311228611A CN117386511A CN 117386511 A CN117386511 A CN 117386511A CN 202311228611 A CN202311228611 A CN 202311228611A CN 117386511 A CN117386511 A CN 117386511A
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- 239000000498 cooling water Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 117
- 230000001105 regulatory effect Effects 0.000 claims abstract description 93
- 238000001816 cooling Methods 0.000 claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 9
- 230000001276 controlling effect Effects 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 53
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 229920006395 saturated elastomer Polymers 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000010606 normalization Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
- F02C7/00—Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for jet-propulsion plants
- F02C7/12—Cooling of plants
- F02C7/16—Cooling of plants characterised by cooling medium
- F02C7/18—Cooling of plants characterised by cooling medium the medium being gaseous, e.g. air
- F02C7/185—Cooling means for reducing the temperature of the cooling air or gas
Abstract
A TCA cooling water control method and system belong to the technical field of gas turbines, and solve the problem that a backwater flow regulating valve is difficult to control cooling water flow when the gas turbine cools air; the method comprises the steps of collecting gas turbine operation data, carrying out data processing on gas turbine load, obtaining TCA cooling water flow set value, calculating deviation value with TCA cooling water flow actual value, inputting the normalized deviation value into a PID module, outputting a control instruction through the PID module, and adjusting TCA backwater flow valve opening; the opening of the return water flow regulating valve in the TCA system is regulated through the PID module, the return water flow of the cooling water is controlled, the occurrence of safety accidents caused by flow imbalance is avoided when the cooler returns water to the high-pressure steam drum, the normal operation of the TCA system in turbine cooling air is ensured, the risk of misoperation of the unit is reduced, and the running stability of the unit is improved.
Description
Technical Field
The invention belongs to the technical field of gas turbines, and relates to a TCA cooling water control method and system.
Background
The turbine cooling air system (TCA system) is an independent thermodynamic system of the Mitsubishi M701F4/F5 gas turbine, and the shafting of the gas turbine unit consists of a gas turbine, a gas compressor, a steam turbine, a generator and the like. In normal operation of the gas turbine, the turbine rotor and the turbine blades exposed to the high temperature gas must be cooled by turbine cooling air. The turbine cooling air is used for cooling a turbine impeller by introducing external air in turbine equipment such as a gas turbine, and in the operation process of the gas turbine, high-temperature and high-pressure gas generally flows through the impeller to raise the surface temperature of the impeller, the cooling air is pumped out from a gas extraction opening of a compressor, is cooled by a TCA system cooler and is sent to the front of a turbine rotor and turbine blades, and heat on the surface of the impeller is absorbed, so that the temperature of the impeller is effectively reduced.
In gas turbines, turbine cooling air is typically cooled by a chiller, which is typically located between the compressor and the combustor of the gas turbine, common chiller types including air coolers and water coolers. The air cooler performs convection heat exchange between turbine cooling air and cooling media in the external environment, such as atmospheric air, and the water cooler performs heat exchange between cold water or other liquid cooling media and the turbine cooling air, for example, the patent of the invention with publication number of CN115559816A discloses a control method and a control system of a water-cooled turbine rotor cooling air system of an M701F4 gas turbine.
In the TCA system, cooling water of a cooler is obtained from a low-pressure steam drum, cooling water flowing out of the low-pressure steam drum is divided into two paths after absorbing heat of exhaust gas of a gas compressor of a combustion engine, one path of water is returned to a condenser through a water supply pump, the other path of water is returned to the high-pressure steam drum through a water supply valve after being converged with an outlet pipeline of a high-pressure economizer, the flow of cooling water of the TCA system is controlled by adjusting a pneumatic flow valve and a water return flow valve, the temperature of turbine cooling air is reduced, and the cooling air is maintained in a temperature range meeting operation requirements. In practice, the opening degree of the backwater flow regulating valve is usually regulated in an open loop control manner, so that the change of TCA cooling water flow cannot be well reflected, and when the water level of the high-pressure steam drum is frequently regulated by the water feeding regulating valve, the cooling water loop flowing into the high-pressure steam drum can generate great fluctuation, so that the backwater flow regulating valve is difficult to control the cooling water flow, the deviation between the actual flow value and the theoretical flow value is larger during operation, and an unstable factor is brought to the operation of the TCA system.
Disclosure of Invention
The technical scheme of the invention is used for solving the problems that when the turbine cools air, the theoretical value and the actual value of the cooling water flow of the gas turbine deviate greatly, and the backwater flow regulating valve is difficult to control the cooling water flow.
The invention solves the technical problems through the following technical scheme:
a TCA cooling water control method, the method comprising:
s1, collecting operation data of a gas turbine, comprising the following steps: the load of the gas turbine, the inlet air temperature of the gas compressor, the actual value of TCA cooling water flow and the opening of the TCA backwater flow valve;
s2, carrying out data processing on the load of the gas turbine, and correcting the load of the gas turbine through the inlet temperature of the gas compressor to obtain a TCA cooling water flow set value;
s3, calculating a deviation value between the TCA cooling water flow set value and the TCA cooling water flow actual value;
s4, normalizing the deviation value, and inputting the normalized deviation value into a PID module;
s5, outputting a control instruction through the PID module, and adjusting the opening of the TCA backwater flow regulating valve.
Further, in the step S2, the data processing is performed on the load of the gas turbine, and the load of the gas turbine is corrected by the air inlet temperature of the air compressor, so as to obtain the set value of the TCA cooling water flow, which includes:
s21, carrying out data processing on the load of the gas turbine through a first function block, and outputting a first function value;
s22, the first function value and the air inlet temperature of the air compressor are used as input data to be sent to a multiplier, and the output value of the multiplier is used as a TCA cooling water flow set value.
Further, the method for calculating the deviation value between the TCA cooling water flow set value and the TCA cooling water flow actual value in step S3 includes: and sending the TCA cooling water flow set value and the TCA cooling water flow actual value into a subtracter as input data, and taking the subtracter output value as a deviation value of the TCA cooling water flow set value and the TCA cooling water flow actual value.
Further, the calculation formula of the control command output by the PID module in step S5 is as follows:
wherein u (t) is the output value of the PID module in the time domain, K is the gain amplification factor, K p Is proportional gain, K i And e (t) is the deviation value of the TCA cooling water flow set value and the TCA cooling water flow actual value in the time domain.
Further, when the load of the gas turbine is smaller than 130MW, the opening of the backwater flow regulating valve is kept at 5%, and the pneumatic flow regulating valve is closed-loop regulated.
Further, when the load of the gas turbine is greater than 130MW, a PID module is called to output a control instruction, the opening of the backwater flow regulating valve is regulated, the minimum limit value of the opening of the backwater flow regulating valve is set to be 30% of the opening in the PID module, and the pneumatic flow regulating valve maintains 5% of the opening.
Further, the method also comprises setting a TR functional block for manually controlling the opening of the backwater flow regulating valve, and when the load of the gas turbine is less than 130MW, manually controlling the backwater flow regulating valve to keep 5% of the opening, and performing closed-loop regulation on the pneumatic flow regulating valve; when the load of the gas turbine is greater than 130MW, the backwater flow regulating valve is manually controlled to increase the opening to 30% at a certain speed, the minimum limit value of the opening is 30% of the opening, and the pneumatic flow regulating valve maintains 5% of the opening.
The invention also provides a control system based on the TCA cooling water control method, which comprises the following steps: comprising the following steps: the low-pressure steam drum and the connected water supply pump, circulating water loop, hot water loop, high-pressure steam drum and high-pressure superheater; the water outlet of the water feeding pump is connected with the water inlet of the circulating water loop through a water feeding pipeline, the water outlet of the circulating water loop is connected with the water inlet of the high-pressure steam drum through an outlet pipeline, and the air outlet of the high-pressure steam drum is connected with the air inlet of the high-pressure superheater through a steam channel;
the hot water loop comprises a turbine cooling air cooler, a pneumatic flow regulating valve and a backwater flow regulating valve; the inlet of the pneumatic flow regulating valve is connected with the inlet of the backwater flow regulating valve in parallel and then connected with the + water outlet of the turbine cooling air cooler, the outlet of the backwater flow regulating valve is connected with the water inlet of the high-pressure steam drum, and the outlet of the pneumatic flow regulating valve is connected with the external condenser through a water supply pipeline.
Further, the circulating water loop comprises a differential pressure valve, a water feeding valve and a high-pressure economizer; the inlet of the differential pressure valve is used as the water inlet of the circulating water loop, the outlet of the water feeding regulating valve is used as the water outlet of the circulating water loop, the outlet of the differential pressure valve is connected with the inlet of the high-pressure economizer, and the outlet of the high-pressure economizer is connected with the inlet of the water feeding regulating valve.
Further, an air outlet of the high-pressure superheater is connected with an external steam turbine through a steam pipeline.
The invention has the advantages that: the opening of the backwater flow regulating valve in the TCA system is regulated through the PID module, the backwater flow of cooling water is controlled, the hot water loop is separated from the circulating water loop, the backwater flow of the backwater flow regulating valve is prevented from being influenced by the opening fluctuation of the water supply regulating valve, the occurrence of safety accidents caused by flow imbalance is avoided when the cooler backwaters to the high-pressure steam drum, the normal running of the TCA system in turbine cooling air is ensured, the risk of misoperation of a unit is reduced, and the running stability of the unit is improved.
Drawings
FIG. 1 is a flow chart of a TCA cooling water control method of an embodiment of the invention;
FIG. 2 is a control block diagram of a TCA cooling water control method according to an embodiment of the invention;
FIG. 3 is a block diagram of a TCA cooling water control system according to an embodiment of the invention;
fig. 4 is a functional relationship diagram of a first functional block of the TCA cooling water control method according to an embodiment of the present invention.
In the figure: 10. a low pressure drum; 20. a water feed pump; 31. a differential pressure valve; 32. a high pressure economizer; 33. feeding water and regulating a door; 41. a turbine cooling air cooler; 42. a pneumatic flow regulating valve; 43. a backwater flow regulating valve; 50. a high pressure steam drum; 60. a high pressure superheater.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described in the following in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The technical scheme of the invention is further described below with reference to the attached drawings and specific embodiments:
example 1
As shown in fig. 1, specifically, a TCA cooling water control method is disclosed, which includes the following steps:
s1, collecting operation data of a gas turbine, comprising the following steps: the load of the gas turbine, the inlet air temperature of the gas compressor, the actual value of TCA cooling water flow and the opening of the TCA backwater flow valve;
in the embodiment, gas turbine load data and gas compressor inlet temperature data which are monitored in real time are obtained from a gas turbine control system side; and (3) acquiring TCA cooling water flow data and TCA backwater flow valve opening data from TCA system site measurement, and sending the data into the TCA cooling water control system of the embodiment in a hard-wired mode.
S2, carrying out data processing on the load of the gas turbine, correcting the load of the gas turbine through the inlet air temperature of the gas compressor, and obtaining a TCA cooling water flow set value, wherein the method comprises the following steps of:
s21, carrying out data processing on the load of the gas turbine through a first function block, and outputting a first function value;
as shown in fig. 4, the input variable of the function block is a gas turbine load value, the output variable is a first function value, and the function relationship is shown in a line diagram of fig. 4, wherein when the gas turbine load data is lower than 130MW, the first function value is in a linear relationship with the gas turbine load value, the output variable value is X1 after the gas turbine load data is operated by the first function block, and the first function value is used as a set value of uncorrected cooling water flow and is further corrected by the air inlet temperature of the air compressor.
S22, taking the first function value and the air inlet temperature of the air compressor as input data to be sent to a multiplier, and taking the output value of the multiplier as a TCA cooling water flow set value;
as shown in fig. 2, the first function value obtained in step S21 is multiplied by the air intake temperature of the compressor, and the value output by the multiplier is used as the corrected TCA cooling water flow rate set value.
S3, calculating a deviation value between the TCA cooling water flow set value and the TCA cooling water flow actual value;
in this embodiment, the TCA cooling water flow set value and the TCA cooling water flow actual value are used as input data of the subtracter, the subtracter output value is used as a deviation value of the TCA cooling water flow set value and the TCA cooling water flow actual value, and used as a control error for input of the PID module, and the actual output value gradually approaches the desired target value through the adjustment of the PID module, so that the effect of reducing the error is achieved.
S4, normalizing the deviation value, and inputting the normalized deviation value into a PID module;
in this embodiment, the deviation value obtained in step S3 is normalized, and if the normalization is not performed, the input deviation of the PID module may have excessive or insufficient measuring range and value, resulting in complex PID parameter tuning process.
S5, outputting a control instruction through the PID module, and adjusting the opening of the TCA backwater flow regulating valve.
In this embodiment, the output value of the PID module is calculated for the input deviation value by using the proportional link and the integral link, and the calculation formula for outputting the control command through the PID module is as follows:
wherein u (t) is the output value of the PID module in the time domain, K is the gain amplification factor, K p Is proportional gain, K i And e (t) is a deviation value of a TCA cooling water flow set value and a TCA cooling water flow actual value in a time domain, and specific parameter values need to be debugged and modified in an actual application process.
The control instruction of the opening of the TCA backwater flow regulating valve is obtained after calculation, the instruction is sent to the on-site executing mechanism through a hard wiring mode, meanwhile, the embodiment also designs a tracking function, and when the control system is in a manual mode, the output of the PID tracks the opening of the TCA backwater flow regulating valve.
In this embodiment, a control strategy of the pneumatic flow control valve and the return water flow control valve in the TCA cooling water control system is described according to the load value of the gas turbine acquired in step S1.
And starting the gas turbine to a load of 130MW, when the load of the gas turbine is smaller than 130MW, correcting the load of the gas turbine through the air inlet temperature of the air compressor in the operation interval, keeping the opening of the backwater flow regulating valve at 5%, and performing closed-loop regulation on the pneumatic flow regulating valve.
When the load of the gas turbine is greater than 130MW, the load of the gas turbine is corrected through the air inlet temperature of the air compressor, the set value of TCA cooling water flow and the input deviation value of the PID module are calculated, the PID module is called to output a control instruction, the opening of the backwater flow regulating valve is regulated, the minimum limit value of the opening of the backwater flow regulating valve is set to be 30% of the opening in the PID module, and the pneumatic flow regulating valve maintains 5% of the opening.
As shown in fig. 2, the TCA cooling water control method further includes setting a TR function block, which is used for manually controlling the opening of the backwater flow regulating valve, and when the backwater flow regulating valve is switched from automatic control to manual control, triggering the PID module to output and track the feedback value of the current valve, so as to realize non-disturbance switching between manual control and automatic control.
When the load of the gas turbine is less than 130MW, manually controlling the backwater flow regulating valve to keep 5% of opening, and performing closed-loop regulation on the pneumatic flow regulating valve; when the load of the gas turbine is greater than 130MW, the opening of the backwater flow regulating valve is manually controlled to be increased to 30% at a certain speed, the minimum limit value of the opening is 30% of the opening, and at the moment, in order to avoid interference of the pneumatic flow regulating valve on the regulation of the backwater flow regulating valve, the pneumatic flow regulating valve is kept at the opening of 5%.
The control method based on the TCA cooling water method of the embodiment is used for carrying out simulation experiments, and under the condition of controlling the backwater flow regulating valve based on open loop, the actual value of the TCA cooling water flow is always maintained at the highest value which can exceed the set value by about 80t/h; under the condition of adjusting the backwater flow regulating valve based on the control method of the embodiment, the actual value of TCA cooling water flow fluctuates within +/-3 t/h of a set value calculated according to the load of the gas turbine, so that the precise adjustment of the opening of the backwater flow regulating valve and the precise control of the cooling water flow are effectively realized.
The embodiment of the invention also provides a control system adopting the TCA cooling water-based method, which comprises the following steps: the low-pressure steam drum 10 and the water supply pump 20, the circulating water loop, the hot water loop, the high-pressure steam drum 50 and the high-pressure superheater 60 which are connected; the water outlet of the water feed pump 20 is connected with the water inlet of the circulating water loop through a water feed pipeline, the water outlet of the circulating water loop is connected with the water inlet of the high-pressure steam drum 50 through an outlet pipeline, the air outlet of the high-pressure steam drum 50 is connected with the air inlet of the high-pressure superheater 60 through a steam channel, and the air outlet of the high-pressure superheater 60 is connected with an external steam turbine through a steam pipeline.
In this embodiment, the high-pressure steam drum 50 and the high-pressure superheater 60 are connected through a steam pipeline, the high-pressure saturated steam is changed into high-temperature and high-pressure superheated steam through a superheating process, and the superheated steam is returned to the high-pressure steam drum 50 to be supplied to equipment or a system requiring the high-temperature and high-pressure steam, and the superheated steam released in the high-pressure superheater 60 can be input into the steam turbine through the steam pipeline to provide power output.
The circulating water loop comprises a differential pressure valve 31, a water feeding regulating valve 33 and a high-pressure economizer 32; the inlet of the differential pressure valve 31 is used as the water inlet of the circulating water loop, the outlet of the water feeding regulating valve 33 is used as the water outlet of the circulating water loop, the outlet of the differential pressure valve 31 is connected with the inlet of the high-pressure economizer 32, and the outlet of the high-pressure economizer 32 is connected with the inlet of the water feeding regulating valve 33.
In this embodiment, the low pressure steam drum 10 in the circulating water loop provides low pressure saturated steam, the steam is pumped by the water feeding pump 20 and is conveyed to the circulating water loop, the water feeding pump 20 is used for providing enough pressure and flow to meet the requirement of the boiler on water feeding, the differential pressure valve 31 controls the water flow by adjusting the opening degree of the valve, the boiler system is maintained in a proper pressure range, the safe and stable operation of the system is ensured, the high pressure economizer 32 heats the feed water by utilizing the waste heat in the boiler flue gas, the fuel consumption is reduced, the requirement on external energy is reduced while the heat efficiency is improved, the water feeding valve 33 is used for adjusting the water feeding flow in the circulating water loop, the water feeding valve 33 is used for controlling the water flow and the speed flowing into the high pressure steam drum 50, the circulating water loop realizes the recycling of heat energy, and provides stable and reliable high pressure steam supply for other equipment or systems, and energy is saved.
The hot water loop comprises a turbine cooling air cooler 41, a pneumatic flow regulating valve 42 and a backwater flow regulating valve 43; the water inlet of the turbine cooling air cooler 41 is connected with the water outlet of the water feeding pump 20, the inlet of the pneumatic flow regulating valve 42 is connected with the + water outlet of the turbine cooling air cooler 41 after being connected in parallel with the inlet of the backwater flow regulating valve 43, the outlet of the backwater flow regulating valve 43 is connected with the water inlet of the high-pressure steam drum 50, and the outlet of the pneumatic flow regulating valve 42 is connected with an external condenser through a water feeding pipeline.
In this embodiment, the low-pressure steam drum 10 is used for supplying the water supply pump 20, the cooling air is effectively cooled by the turbine cooling air cooler 41, the two branches of the turbine cooling air cooler 41 are provided with the pneumatic flow regulating valve 42 and the backwater flow regulating valve 43 to regulate and distribute the flow, the branch where the pneumatic flow regulating valve 42 is located flows the steam after absorbing the heat to the condenser, so that the cooling and recovery of the condensing agent can be realized, the thermal efficiency of the system is improved, and the loss of heat energy is reduced.
The backwater flow rate regulating valve 43 is used for backwater cooling water after absorbing heat to the high-pressure steam drum 50, the cooling water guided back to the high-pressure steam drum 50 is used for providing enough high-pressure saturated steam to generate power output and drive a steam turbine and other devices, in the embodiment, control of the backwater flow rate regulating valve 43 is mainly achieved, compared with the conventional TCA cooling water control system, the backwater flow rate regulating valve 33 is used for always controlling the water flow rate of a circulating water loop and a hot water loop, the circulating water loop and the hot water loop are separated, an outlet of the backwater flow rate regulating valve 43 is directly connected with a water inlet of the high-pressure steam drum 50, the backwater regulating valve 33 is arranged in the circulating water loop, and the fact that the cooling water loop flowing into the high-pressure steam drum 50 is greatly fluctuated due to the fact that the backwater regulating valve 33 regulates the water level of the high-pressure steam drum 50 is avoided, and the backwater flow rate regulating valve 43 is difficult to control the cooling water flow rate.
The above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A TCA cooling water control method, characterized in that the method includes:
s1, collecting operation data of a gas turbine, comprising the following steps: the load of the gas turbine, the inlet air temperature of the gas compressor, the actual value of TCA cooling water flow and the opening of the TCA backwater flow valve;
s2, carrying out data processing on the load of the gas turbine, and correcting the load of the gas turbine through the inlet temperature of the gas compressor to obtain a TCA cooling water flow set value;
s3, calculating a deviation value between the TCA cooling water flow set value and the TCA cooling water flow actual value;
s4, normalizing the deviation value, and inputting the normalized deviation value into a PID module;
s5, outputting a control instruction through the PID module, and adjusting the opening of the TCA backwater flow regulating valve.
2. The TCA cooling water control method according to claim 1, wherein the step S2 of processing data of the load of the gas turbine, correcting the load of the gas turbine by the intake air temperature of the compressor, and obtaining the TCA cooling water flow rate set value includes:
s21, carrying out data processing on the load of the gas turbine through a first function block, and outputting a first function value;
s22, the first function value and the air inlet temperature of the air compressor are used as input data to be sent to a multiplier, and the output value of the multiplier is used as a TCA cooling water flow set value.
3. The TCA cooling water control method according to claim 1, wherein the method for calculating the deviation value between the TCA cooling water flow rate set value and the TCA cooling water flow rate actual value in step S3 includes: and sending the TCA cooling water flow set value and the TCA cooling water flow actual value into a subtracter as input data, and taking the subtracter output value as a deviation value of the TCA cooling water flow set value and the TCA cooling water flow actual value.
4. The TCA cooling water control method according to claim 1, characterized in that in step S5, the calculation formula of the control command output by the PID module is as follows:
wherein u (t) is the output value of the PID module in the time domain, K is the gain amplification factor, K p Is proportional gain, K i And e (t) is the deviation value of the TCA cooling water flow set value and the TCA cooling water flow actual value in the time domain.
5. The TCA cooling water control method of claim 1, in which the return water flow rate regulating valve maintains 5% of opening when the gas turbine load is less than 130MW, and the pneumatic flow rate regulating valve performs closed-loop regulation.
6. The TCA cooling water control method according to claim 1, characterized in that when the load of the gas turbine is greater than 130MW, a PID module is called to output a control command, the opening of the backwater flow regulating valve is regulated, the minimum limit value of the opening of the backwater flow regulating valve is set to be 30% of the opening in the PID module, and the pneumatic flow regulating valve maintains 5% of the opening.
7. The TCA cooling water control method of claim 1, further comprising setting a TR function block for manually controlling an opening of the backwater flow rate adjustment valve, when the gas turbine load is less than 130MW, manually controlling the backwater flow rate adjustment valve to maintain an opening of 5%, and performing closed-loop adjustment of the pneumatic flow rate adjustment valve; when the load of the gas turbine is greater than 130MW, the backwater flow regulating valve is manually controlled to increase the opening to 30% at a certain speed, the minimum limit value of the opening is 30% of the opening, and the pneumatic flow regulating valve maintains 5% of the opening.
8. A TCA cooling water control system based on any one of claims 1 to 7, comprising: the low-pressure steam drum (10) and the water supply pump (20), the circulating water loop, the hot water loop, the high-pressure steam drum (50) and the high-pressure superheater (60) are connected; the water outlet of the water feeding pump (20) is connected with the water inlet of the circulating water loop through a water feeding pipeline, the water outlet of the circulating water loop is connected with the water inlet of the high-pressure steam drum (50) through an outlet pipeline, and the air outlet of the high-pressure steam drum (50) is connected with the air inlet of the high-pressure superheater (60) through a steam channel;
the hot water loop comprises a turbine cooling air cooler (41), a pneumatic flow regulating valve (42) and a backwater flow regulating valve (43); the water inlet of the turbine cooling air cooler (41) is connected with the water outlet of the water feeding pump (20), the inlet of the pneumatic flow regulating valve (42) is connected with the water outlet of the turbine cooling air cooler (41) after being connected in parallel with the inlet of the backwater flow regulating valve (43), the outlet of the backwater flow regulating valve (43) is connected with the water inlet of the high-pressure steam drum (50), and the outlet of the pneumatic flow regulating valve (42) is connected with the external condenser through the water feeding pipeline.
9. The TCA cooling water control system of claim 8, characterized in that the circulating water circuit comprises a differential pressure valve (31), a water feed valve (33), a high pressure economizer (32); the inlet of the differential pressure valve (31) is used as the water inlet of the circulating water loop, the outlet of the water feeding regulating valve (33) is used as the water outlet of the circulating water loop, the outlet of the differential pressure valve (31) is connected with the inlet of the high-pressure economizer (32), and the outlet of the high-pressure economizer (32) is connected with the inlet of the water feeding regulating valve (33).
10. The TCA cooling water control system of claim 8, in which the outlet of the high pressure superheater (60) is connected to an external steam turbine by a steam pipe.
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| CN202311228611.7A CN117386511A (en) | 2023-09-21 | 2023-09-21 | TCA cooling water control method and system |
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| CN202311228611.7A CN117386511A (en) | 2023-09-21 | 2023-09-21 | TCA cooling water control method and system |
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2023
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