CN117472119A - Exhaust steam temperature control method and device for single-shaft gas turbine - Google Patents
Exhaust steam temperature control method and device for single-shaft gas turbine Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000005520 cutting process Methods 0.000 claims abstract description 15
- 230000003111 delayed effect Effects 0.000 claims abstract description 6
- 239000000446 fuel Substances 0.000 claims description 17
- 230000008569 process Effects 0.000 claims description 13
- 230000009467 reduction Effects 0.000 abstract description 4
- 230000003213 activating effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 57
- 230000008859 change Effects 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000003491 array Methods 0.000 description 2
- 230000001934 delay Effects 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000002737 fuel gas Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000002918 waste heat Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
Abstract
A steam exhaust temperature control method and device of a single-shaft gas turbine belong to the technical field of combined cycle units, and solve the problems that when a steam turbine is meshed with the units, the load of the steam turbine is increased to cause sudden drop of the load of the gas turbine and reduce the steam pressure and temperature parameters; setting an initial load and keeping the load unchanged when the turbine is in a running state, calculating a temperature set value according to unit history data, writing the temperature set value into a temperature control loop, clicking a temperature remote control input button, manually inputting a start-stop loop, activating the start-stop loop in a delayed manner, triggering a temperature input signal, sending the set value into a steam exhaust temperature control loop by the temperature control loop, keeping a grid-connected rotating speed after the turbine is in a running state, and cutting off the start-stop loop in a delayed manner; the invention replaces the exhaust temperature of the gas turbine by the set value of the given exhaust temperature when the steam turbine is connected, the load reduction of the gas turbine caused by the load increase of the gas turbine grid connection is avoided, and the system stability and the operation efficiency of the combined cycle unit are improved.
Description
Technical Field
The invention belongs to the technical field of combined cycle units, and relates to a steam exhaust temperature control method and device of a single-shaft gas turbine.
Background
The process flow of the gas-steam combined cycle unit is as follows: natural gas enters a combustion chamber through a shutoff valve and a fuel valve, air is continuously sucked from the atmosphere by a gas compressor and compressed, the compressed air enters the combustion chamber, the compressed air is mixed with injected fuel and then combusted into high-temperature fuel gas, the high-temperature fuel gas flows into gas turbine equipment to expand and do work, turbine impeller wheels are pushed to rotate together with the gas compressor impeller wheels, a generator is directly driven to generate power, high-temperature flue gas discharged after the work is directly driven to a waste heat boiler, high-temperature and high-pressure steam is generated by utilizing heat of the high-temperature flue gas, and then a generator set is driven to generate power, so that high-efficiency gas-steam combined cycle is formed.
The gas turbine can be divided into a single-shaft gas turbine and a split-shaft gas turbine according to the structure, and the single-shaft gas turbine and the steam turbine can be integrated on one shaft, so that exhaust steam can be better recycled, the steam turbine can generate additional power by utilizing high-temperature exhaust gas discharged by the gas turbine, the overall heat efficiency of the whole combined cycle system is improved, and compared with the split-shaft gas turbine, the single-shaft gas turbine has the characteristics of simple structure, small space occupation, low manufacturing cost and low maintenance cost, and therefore the single-shaft gas turbine is often adopted to be applied to a combined cycle unit.
In general, as shown in fig. 1, a load control mode of a gas turbine controls the start of the gas turbine through a start-up speed increasing loop and a rotation speed control loop, a gas turbine generator is controlled by the load control loop after grid connection, and under a specific working condition, the gas turbine can activate a steam exhaust temperature control loop; the four loops are connected in parallel and output after small selection calculation, and a fuel valve controller outputs a fuel valve command to distribute fuel to a fuel valve, and the fuel valve controls the air inflow of natural gas to change the load of the gas turbine. As disclosed in patent publication No. CN218844438U, a load control device for a gas turbine is disclosed, in which a feedforward control loop is added to a load control system, the output result of a PID regulator is used to fine tune the opening of a premix valve output by the feedforward control loop, so as to optimize the load control system for the gas turbine, the upper limit of the rising speed of a closed loop control system is controlled by setting a starting rising speed control loop and a steam exhaust temperature control loop, and the difficult problem of combustion overtemperature of the gas turbine is avoided by setting a steam exhaust temperature set value.
In fact, when the turbine is engaged with the unit, the load of the turbine suddenly increases, and the load of the turbine is necessarily reduced due to the fact that the total load command is kept unchanged, so that the corresponding steam pressure and temperature parameters are reduced, and the generated steam cannot meet the normal operation requirements of the turbine. The reduction of the load of the gas turbine in turn affects the load conditions of the turbine, causing relatively large disturbances which may appear as oscillations and seriously affect the stability of the system and the efficiency of the operation of the unit, which is a detrimental effect on the operation of the unit, which is difficult to solve in the prior art due to the sudden drop of the load of the gas turbine.
Disclosure of Invention
The invention is used for solving the problems that when the steam turbine is meshed with the unit, the load of the steam turbine is increased to cause the sudden drop of the load of the fuel engine, and the steam pressure and the temperature parameters are reduced.
The invention solves the technical problems through the following technical scheme:
a method for controlling exhaust steam temperature of a single-shaft gas turbine, applied to a control device, the method comprising:
s1, setting an initial load of a turbine in the process of turning and keeping the load unchanged;
s2, calculating a temperature set value according to historical data of the unit and writing the temperature set value into a temperature control loop;
s3, clicking a temperature remote control input button, and manually inputting a start-stop loop;
s4, starting and stopping the loop to activate in a delayed manner, triggering a temperature input signal, and sending a set value into a steam exhaust temperature control loop by a temperature control loop;
and S5, after the turbine is in the process of turning, maintaining the grid-connected rotating speed, delaying cutting off the start-stop loop, and returning to the step S4 if the grid-connected rotating speed is not reached.
Further, the initial load of the turbine at the time of the turbine turning is set to 30MW in the step S1.
Further, in step S5, the turbine keeps the grid-connected rotating speed at 3000r/min.
Further, the method for cutting off the start-stop loop in step S5 further includes: clicking a temperature remote control cutting button, and manually cutting off the start-stop loop.
The invention also provides a device based on the exhaust steam temperature control method of the single-shaft gas turbine, which comprises: a start-stop loop, a temperature control loop and a steam exhaust temperature control loop; the output end of the start-stop loop is connected with the input end of the temperature control loop, and the output end of the temperature control loop is connected with the input end of the exhaust steam temperature control loop;
the start-stop loop comprises: a first NOT gate, a first AND gate, a second AND gate, a first OR gate, a first timer, a second timer, a first trigger and a pulse trigger; one input end of the first AND gate receives a temperature remote control input signal, the other input end of the first AND gate is connected with one end of a first timer, the other end of the first timer is connected with one end of a first NOT gate, the other end of the first NOT gate is connected with the output end of a first trigger, the output end of the first AND gate is connected with the setting end of the first trigger, the output end of the first OR gate is connected with the reset end of the first trigger, and the output end of the first trigger outputs a temperature control input signal; one input end of the second AND gate receives a remote control temperature input signal, the other input end of the second AND gate is connected with the output end of the first trigger, and the output end of the second AND gate is connected with the first input end of the first OR gate; the second timer is connected in series with the pulse trigger, the non-series end of the second timer receives the engaged signal of the steam turbine, the non-series end of the pulse trigger is connected with the second input end of the first or gate, and the third input end of the first or gate is connected with the temperature remote control cutting signal.
Further, the temperature control loop includes: the system comprises a subtracter, a second NOT gate, a second OR gate, a third AND gate, a third timer, a tracking module and a first rate limiter; the subtracter is connected with the input end of the tracking module, and the subtracter is connected with the output end of the tracking module; one end of the second NOT gate receives a temperature control input signal, the other end of the second NOT gate is connected with one input end of the third AND gate, the other input end of the third AND gate is connected with the output end of the second OR gate, one end of the third NOT gate serves as an input end of a temperature control loop and receives the temperature control input signal, the other end of the third NOT gate is connected with one input end of the second OR gate, the other input end of the second OR gate receives a manual start-stop signal, the output end of the third AND gate is connected with one end of a third timer, the other end of the third timer is connected with the control end of the tracking module, the write-in end of the tracking module receives an externally written temperature set value signal, and the output end of the tracking module outputs the temperature set signal.
Further, the exhaust steam temperature control circuit includes: a second rate limiter, a deviation arithmetic unit and a steam exhaust temperature controller; the speed limiter, the deviation arithmetic unit and the exhaust steam temperature controller are connected in series, the non-series end of the speed limiter is used as an input end to receive the temperature control setting signal, and the non-series end of the exhaust steam temperature controller is used as an output end to send the fuel valve opening degree adjusting quantity signal.
The invention has the advantages that: according to the invention, when the steam turbine is connected, the set value of the steam exhaust temperature is set to replace the steam exhaust temperature of the gas turbine, the opening of the fuel valve is limited according to the regulating instruction output by the steam exhaust temperature controller, the purpose of limiting the load of the gas turbine is achieved, the load reduction of the gas turbine caused by the load increase of the steam turbine connected is avoided, and the system stability and the operation efficiency of the combined cycle unit are improved.
Drawings
FIG. 1 is a block diagram of load control of a gas turbine engine in the background;
FIG. 2 is a flow chart of a method of controlling exhaust gas temperature of a single-shaft gas turbine according to an embodiment of the present invention;
FIG. 3 is a block diagram of a start-stop circuit in a steam exhaust temperature control device of a single-shaft gas turbine according to an embodiment of the present invention;
FIG. 4 is a block diagram of a temperature control circuit in a steam exhaust temperature control device of a single-shaft gas turbine according to an embodiment of the present invention;
in the figure: 10. a first NOT gate; 11. a first AND gate; 12. a second AND gate; 13. a first OR gate; 14. a first timer; 15. a second timer; 16. a first trigger; 17. a pulse trigger; 20. a subtracter; 21. a second NOT gate; 22. a third NOT gate; 23. a second or gate; 24. a third AND gate; 25. a third timer; 26. a tracking module; 27. a first rate limiter; 30. a second rate limiter; 31. a deviation calculator; 32. and a steam exhaust temperature controller.
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. 2, specifically, a method for controlling the exhaust steam temperature of a single-shaft gas turbine is disclosed, which comprises the following steps:
s1, setting an initial load of a turbine in the process of turning and keeping the load unchanged;
when the steam turbine is meshed in a grid connection mode, the initial load set value of the turbine is set to be 30MW, the initial load set value is used for providing enough auxiliary power and rotational speed acceleration for the steam turbine in the process of the turbine, the rotor rotational speed of the steam turbine is ensured to gradually increase to reach the energy input required by the synchronization with the frequency of a power grid, the load is kept unchanged, the stability of the load can be ensured, and the smooth grid connection and normal operation of the steam turbine can be ensured.
S2, calculating a temperature set value according to historical data of the unit and writing the temperature set value into a temperature control loop;
the operator calculates a reasonable temperature value through the unit history data as a set value of the gas turbine exhaust steam temperature controller, and the set value ensures that parameters such as the air inlet pressure, the temperature and the flow of the steam turbine are in proper ranges at the initial moment.
S3, clicking a temperature remote control input button, and manually inputting a start-stop loop;
in this embodiment, when the steam turbine is to be connected, an operator manually clicks a temperature remote control input button on the front end interface to send a switching value signal of the temperature remote control input to the input end of the control loop, and the switching value signal is used as a start signal to input into the start-stop loop.
S4, starting and stopping the loop to activate in a delayed manner, triggering a temperature input signal, and sending a set value into a steam exhaust temperature control loop by a temperature control loop;
after receiving the temperature remote control input signal, the start-stop loop delays for 300 seconds to send a high-level signal to the trigger, and the trigger sets and outputs the temperature input signal which is used as an input signal of the temperature control loop; in the embodiment, an operator writes the temperature set value obtained in the step S2 in a front-end interface, sends the temperature set value into a tracking module in a temperature control loop, outputs an updated exhaust steam temperature set value, limits the opening of a fuel valve according to a regulating instruction output by a steam exhaust temperature controller, ensures that a gas turbine meets grid-connected starting conditions when grid-connected, limits the increase and decrease of the load of the gas turbine, avoids larger disturbance caused by the load fluctuation of the steam turbine, and ensures that the steam turbine is smoothly connected with a power grid; the operation personnel strengthen the monitoring disc, pay close attention to the working condition of the exhaust steam temperature loop in real time, and can assign the value to the exhaust steam temperature set value again through the front end interface.
S5, after the turbine is in the process of turning, maintaining the grid-connected rotating speed, delaying cutting off the start-stop loop, and returning to the step S4 if the grid-connected rotating speed is not reached;
after the steam turbine is connected with the power grid successfully, the steam turbine is meshed and a meshed signal of the steam turbine is sent to a start-stop loop, a timer in the start-stop loop is delayed by 2400 seconds to be connected with a trigger reset end, and a temperature control input signal outputs a low level.
In the embodiment, the turbine keeps the grid-connected rotating speed of 3000r/min and keeps the stable operation for 40 minutes, then the turbine is considered to complete the impact rotation, the grid connection is successful, the working state of the start-stop loop is automatically cut off, the temperature control loop stops sending the temperature set value to the exhaust steam temperature control loop, and the exhaust steam temperature control loop is only influenced by the exhaust steam temperature set by the gas turbine.
In the embodiment, when an operator finds abnormal parameters in the process of monitoring, the start-stop loop can be manually cut off at any time by clicking a temperature remote control cut-off button, and the limitation on the load of the gas turbine is stopped.
Because the steam turbine generator set has the delay and hysteresis characteristics of heat absorption and working by the waste heat boiler, the load changing process has longer hysteresis characteristics than the load changing process of the gas turbine, therefore, quantitative distribution is difficult to realize in the actual dynamic process, in the actual engineering, the load coordination control generally adopts the mode that the total load instruction is directly distributed to the gas turbine, and the balance of the total load instruction is realized by the gas turbine.
The embodiment of the invention also provides a device adopting the exhaust steam temperature control method based on the single-shaft gas turbine, which comprises the following steps: a start-stop loop, a temperature control loop and a steam exhaust temperature control loop; the output end of the start-stop loop is connected with the input end of the temperature control loop, and the output end of the temperature control loop is connected with the input end of the exhaust steam temperature control loop; the start-stop loop is used for inputting and cutting off the control of the exhaust steam temperature of the gas turbine when the gas turbine is connected with the grid, the temperature control loop is used for switching the temperature value of the exhaust steam temperature control loop, and the exhaust steam temperature control loop is used for adjusting the opening of the fuel valve according to the exhaust steam temperature difference value.
The start-stop loop comprises: a first NOT gate 10, a first AND gate 11, a second AND gate 12, a first OR gate 13, a first timer 14, a second timer 15, a first trigger 16, and a pulse trigger 17; one input end of the first and gate 11 receives a temperature remote control input signal, the other input end of the first and gate 11 is connected with one end of the first timer 14, the other end of the first timer 14 is connected with one end of the first NOT gate 10, the other end of the first NOT gate 10 is connected with the output end of the first trigger 16, the output end of the first and gate 11 is connected with the set end of the first trigger 16, the output end of the first or gate 13 is connected with the reset end of the first trigger 16, and the output end of the first trigger 16 outputs a temperature control input signal; one input end of the second and gate 12 receives a remote control temperature input signal, the other input end of the second and gate 12 is connected with the output end of the first trigger 16, and the output end of the second and gate 12 is connected with the first input end of the first or gate 13; the second timer 15 is connected in series with the pulse trigger 17, the non-series end of the second timer 15 receives the engaged signal of the steam turbine, the non-series end of the pulse trigger 17 is connected with the second input end of the first or gate 13, and the third input end of the first or gate 13 is connected with the temperature remote control cutting signal.
As shown in fig. 3, when the steam turbine starts to be connected, an operator sends a temperature remote control input signal through a button of a front interface, the temperature remote control input signal is at a high level, at this time, the engaged signal and the temperature remote control cut-off signal of the steam turbine are at a low level, at this time, the output ends of the first or gate 13, the first or gate 11, the second or gate 12 and the first trigger 16 are all at a low level, the first not gate 10 inputs the high level signal into the first timer 14, the first or gate 11 is turned on after 300 seconds, at this time, the first or gate 11 outputs the high level, the first trigger 16 outputs the high level, the temperature control input signal and the temperature control input intermediate quantity are at a high level, the power-on/off circuit is started after 5 minutes of time delay, and the temperature control input signal is sent into the temperature control loop;
when the steam turbine is connected to the grid successfully, the control system transmits the engaged signal of the steam turbine, the second timer 15 delays 2400 seconds and outputs a high level, the pulse trigger 17 is a rising edge trigger for outputting a high level pulse for maintaining 3 seconds
The first or gate 13 inputs a high level signal to the reset end of the first trigger 16, the first trigger 16 outputs a low level, that is, the temperature control input signal and the temperature control input intermediate quantity are low level, the power circuit is started to cut off the input, and the control device exits the control of the exhaust steam temperature control loop.
In this embodiment, when an operator finds an abnormal situation, the operator can send a temperature remote control cutting signal to the first trigger 16 at any time through the temperature remote control cutting button of the front end interface in the operation process, and cut off the start-stop loop, and exit the control of the exhaust steam temperature control loop without delay.
The temperature control loop comprises: subtractor 20, second NOT gate 21, second OR gate 23, third AND gate 24, third timer 25, tracking module 26, first rate limiter 27; the subtracted end of the subtracter 20 receives the exhaust gas temperature signal of the combustion engine, the speed reducing end of the subtracter 20 inputs an analog signal corresponding to the difference value, and the output end of the subtracter 20 is connected with the input end of the tracking module 26.
One end of the second NOT gate 21 receives a temperature control input signal, the other end of the second NOT gate 21 is connected with one input end of the third AND gate 24, the other input end of the third AND gate 24 is connected with the output end of the second OR gate 23, one end of the third NOT gate 22 serves as an input end of a temperature control loop and receives a temperature control input feedback signal, the other end of the third NOT gate 22 is connected with one input end of the second OR gate 23, the other input end of the second OR gate 23 receives a manual start-stop signal, the output end of the third AND gate 24 is connected with one end of the third timer 25, the other end of the third timer 25 is connected with the control end of the tracking module 26, the input end of the tracking module 26 receives an externally written temperature set value signal, and the output end of the tracking module 26 outputs a temperature set signal.
As shown in fig. 4, when the steam turbine is not meshed in a grid, the temperature control loop acquires the exhaust steam temperature of the gas turbine in real time, subtracts 8 ℃ from the temperature value through the subtracter 20, inputs the temperature value into the tracking module 26, selects the tracking port to be high level at the moment, outputs the value equal to the temperature value of the input end of the tracking module 26, sends the output value of the tracking module 26 into the exhaust steam temperature control loop, and calculates the fuel valve adjustment quantity according to the difference value between the temperature value and the exhaust steam temperature.
When the steam turbine is meshed in a grid connection mode, the temperature of the gas exhaust can be changed drastically due to sudden reduction of the load of the gas turbine, so that the change of the load of the gas turbine is limited through the written temperature set value, the drastic change of the temperature of the gas turbine is avoided, and disturbance is reduced; when the temperature control input signal, the temperature control input feedback signal and the bypass signal are all high levels after the start-stop loop sends the temperature control input signal, the third AND gate 24 outputs a low level, the third timer 25 is disconnected after 3 seconds of time delay after being changed from the high level to the low level, the tracking port is selected to be low level, the output value of the tracking module 26 is a temperature set value signal written in from the writing end to the outside, the temperature control loop sends the output value of the tracking module 26 into the steam exhaust temperature control loop, and the fuel valve adjustment amount is calculated according to the difference value between the output value and the steam exhaust temperature.
The temperature control input feedback signal is a feedback signal sent by the gas turbine after the temperature control input signal is sent, the bypass signal is a trigger signal manually given by an interface at the front end of an operator in consideration of safety.
The first rate limiter 27 is used for limiting the change rate of the exhaust steam temperature set value, preventing the temperature set value from changing too fast, affecting the system stability and guaranteeing the safety of the temperature control loop.
In this embodiment, an analog alarm module is further provided, and an alarm temperature value can be set, and when the output temperature set value is higher than the alarm value, an alarm signal is sent to the upper computer network.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In this embodiment, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
The exhaust steam temperature control circuit comprises: a second rate limiter 30, a deviation calculator 31, and a steam exhaust temperature controller 32; the speed limiter, the deviation arithmetic unit 31 and the exhaust steam temperature controller 32 are connected in series, the non-series end of the speed limiter is used as an input end to receive the temperature control setting signal, and the non-series end of the exhaust steam temperature controller 32 is used as an output end to send the fuel valve opening degree regulating quantity signal.
As shown in fig. 1, the second rate limiter 30 is configured to limit the rate of change of the exhaust gas temperature set value, prevent the set value from changing too fast to affect the system stability, the deviation calculator 31 is configured to calculate a deviation value between the exhaust gas temperature value and the exhaust gas temperature set value, and the exhaust gas temperature controller 32 is configured to calculate the fuel valve opening adjustment.
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 (7)
1. A method of controlling exhaust steam temperature of a single-shaft gas turbine, applied to a control device, the method comprising:
s1, setting an initial load of a turbine in the process of turning and keeping the load unchanged;
s2, calculating a temperature set value according to historical data of the unit and writing the temperature set value into a temperature control loop;
s3, clicking a temperature remote control input button, and manually inputting a start-stop loop;
s4, starting and stopping the loop to activate in a delayed manner, triggering a temperature input signal, and sending a set value into a steam exhaust temperature control loop by a temperature control loop;
and S5, after the turbine is in the process of turning, maintaining the grid-connected rotating speed, delaying cutting off the start-stop loop, and returning to the step S4 if the grid-connected rotating speed is not reached.
2. The method according to claim 1, wherein the initial load of the turbine in step S1 is set to 30MW.
3. The exhaust gas temperature control method of a single-shaft gas turbine according to claim 1, wherein in step S5, the turbine is kept at a grid-connected rotational speed of 3000r/min.
4. The exhaust gas temperature control method of a single-shaft gas turbine according to claim 1, wherein the method of removing the start-stop circuit in step S5 further comprises: clicking a temperature remote control cutting button, and manually cutting off the start-stop loop.
5. An apparatus based on the exhaust gas temperature control method of a single-shaft gas turbine according to any one of claims 1 to 4, characterized in that the apparatus comprises: a start-stop loop, a temperature control loop and a steam exhaust temperature control loop; the output end of the start-stop loop is connected with the input end of the temperature control loop, and the output end of the temperature control loop is connected with the input end of the exhaust steam temperature control loop;
the start-stop loop comprises: the first NOT gate (10), the first AND gate (11), the second AND gate (12), the first OR gate (13), the first timer (14), the second timer (15), the first trigger (16) and the pulse trigger (17); one input end of the first AND gate (11) receives a temperature remote control input signal, the other input end of the first AND gate (11) is connected with one end of a first timer (14), the other end of the first timer (14) is connected with one end of a first NOT gate (10), the other end of the first NOT gate (10) is connected with the output end of a first trigger (16), the output end of the first AND gate (11) is connected with the setting end of the first trigger (16), the output end of the first OR gate (13) is connected with the reset end of the first trigger (16), and the output end of the first trigger (16) outputs the temperature control input signal; one input end of the second AND gate (12) receives a remote control temperature input signal, the other input end of the second AND gate (12) is connected with the output end of the first trigger (16), and the output end of the second AND gate (12) is connected with the first input end of the first OR gate (13); the second timer (15) is connected in series with the pulse trigger (17), the non-series end of the second timer (15) receives the engaged signal of the steam turbine, the non-series end of the pulse trigger (17) is connected with the second input end of the first or gate (13), and the third input end of the first or gate (13) is connected with the temperature remote control cutting signal.
6. The exhaust gas temperature control device of a single-shaft gas turbine according to claim 5, wherein the temperature control circuit comprises: a subtracter (20), a second NOT gate (21), a third NOT gate (22), a second OR gate (23), a third AND gate (24), a third timer (25), a tracking module (26) and a first rate limiter (27); the subtracter (20) is used for receiving the exhaust steam temperature signal of the gas turbine, the speed reducing end of the subtracter (20) is used for inputting an analog quantity signal corresponding to the difference value, and the output end of the subtracter (20) is connected with the input end of the tracking module (26);
one end of the second NOT gate (21) receives a temperature control input signal, the other end of the second NOT gate (21) is connected with one input end of a third AND gate (24), the other input end of the third AND gate (24) is connected with the output end of the second OR gate (23), one end of the third NOT gate (22) serves as an input end of a temperature control loop and receives the temperature control input signal, the other end of the third NOT gate (22) is connected with one input end of the second OR gate (23), the other input end of the second OR gate (23) receives a manual start-stop signal, the output end of the third AND gate (24) is connected with one end of a third timer (25), the other end of the third timer (25) is connected with the control end of the tracking module (26), the write-in end of the tracking module (26) receives an externally written temperature set value signal, and the output end of the tracking module (26) outputs a temperature set signal.
7. The exhaust gas temperature control apparatus of a single-shaft gas turbine according to claim 5, wherein the exhaust gas temperature control circuit includes: a second rate limiter (30), a deviation calculator (31), and a steam exhaust temperature controller (32); the speed limiter, the deviation arithmetic unit (31) and the exhaust steam temperature controller (32) are connected in series, the non-series end of the speed limiter is used as an input end to receive a temperature control setting signal, and the non-series end of the exhaust steam temperature controller (32) is used as an output end to send a fuel valve opening degree adjusting quantity signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311259585.4A CN117472119A (en) | 2023-09-26 | 2023-09-26 | Exhaust steam temperature control method and device for single-shaft gas turbine |
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| CN202311259585.4A CN117472119A (en) | 2023-09-26 | 2023-09-26 | Exhaust steam temperature control method and device for single-shaft gas turbine |
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