CN114815918A - Temperature control system and method for supercritical carbon dioxide cycle power generation precooler - Google Patents
Temperature control system and method for supercritical carbon dioxide cycle power generation precooler Download PDFInfo
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- CN114815918A CN114815918A CN202210454020.0A CN202210454020A CN114815918A CN 114815918 A CN114815918 A CN 114815918A CN 202210454020 A CN202210454020 A CN 202210454020A CN 114815918 A CN114815918 A CN 114815918A
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Abstract
The invention discloses a temperature control system and method for a supercritical carbon dioxide cycle power generation precooler, which comprises a main pipeline valve regulating PID controller, a water pump frequency converter PID controller, a valve regulating PID controller, a fan frequency conversion PID, an electric valve regulating PID controller, a first frequency conversion water pump, a second frequency conversion water pump, a precooler, a second temperature transmitter, a first temperature transmitter, a cooling water main pipeline valve, an upper tower electric regulating valve, a return tower pool electric regulating valve, a frequency conversion fan, a precooler side valve, a third temperature transmitter, a water supplementing electric valve, a cooling water tower pool, a cooling tower and a liquid level transmitter.
Description
Technical Field
The invention belongs to the technical field of carbon dioxide cycle power generation, and relates to a temperature control system and method for a supercritical carbon dioxide cycle power generation precooler.
Background
At present, carbon dioxide cycle power generation becomes a novel power generation mode which is mainly attacked by various research and development institutions, an innovative union has been established by western's security thermal institute in combination with multiple scientific research institutions, the first 5MW supercritical carbon dioxide power generation test unit in the world passes long-time stable operation tests, and supercritical carbon dioxide cycle power generation becomes a novel commercial operation mode in the power generation field. The precooler 5 is used as the last ring of the carbon dioxide closed cycle and plays the roles of absorbing the residual heat after power generation and stabilizing the inlet temperature of the compressor, the efficiency of the compressor is directly influenced by the overhigh inlet temperature of the compressor, the power generation efficiency of a unit is further influenced, and the safe and stable operation of the compressor is influenced by the fact that the carbon dioxide enters a liquid phase region due to the overlow inlet temperature. Currently, there is no study on how to control the precooler temperature.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a temperature control system and a temperature control method for a precooler for supercritical carbon dioxide cycle power generation, which realize the control of the temperature of the precooler in the supercritical carbon dioxide cycle power generation.
In order to achieve the aim, the temperature control system of the supercritical carbon dioxide cycle power generation precooler comprises a main pipeline valve regulating PID controller, a water pump frequency converter PID controller, a valve regulating PID controller, a fan frequency conversion PID, an electric valve regulating PID controller, a first frequency conversion water pump, a second frequency conversion water pump, a precooler, a second temperature transmitter, a first temperature transmitter, a cooling water main pipeline valve, an upper tower electric regulating valve, a return tower pool electric regulating valve, a frequency conversion fan, a precooler side valve, a third temperature transmitter, a water supplementing electric valve, a cooling water tower pool, a cooling tower and a liquid level transmitter;
the bottom outlet of the cooling water tower pool is communicated with the inlet of a first variable frequency water pump and the inlet of a second variable frequency water pump after passing through a third temperature transmitter, the first variable frequency water pump is communicated with the second variable frequency water pump in parallel, the outlet of the first variable frequency water pump and the outlet of the second variable frequency water pump are divided into two paths after being connected in a pipeline in parallel, one path is communicated with the inlet of the cooling water tower pool through a valve beside a precooler, the other path is communicated with the inlet of the pipe side of the precooler, the outlet of the pipe side of the precooler is communicated with the inlet of a valve of a cooling water main pipeline through the first temperature transmitter, the outlet of the valve of the cooling water main pipeline is divided into two paths, one path is communicated with a spray header in the cooling tower through an electric regulating valve of an upper tower, the other path is communicated with the inlet of the cooling water tower pool through an electric regulating valve of a return tower pool, the cooling tower is positioned above the cooling water tower pool, and the bottom opening of the cooling tower is over against the cooling water tower pool, a variable frequency fan is arranged at the opening at the top of the cooling tower;
a liquid level transmitter is arranged in the cooling water tower pool, and a water supplementing pipeline is communicated with an inlet of the cooling water tower pool through a water supplementing electric valve;
the main pipeline valve adjusting PID controller and the water pump frequency converter PID controller are connected with the second temperature transmitter, the cooling water main pipeline valve adjusting, the first variable frequency water pump and the second variable frequency water pump;
the valve adjusting PID controller and the fan frequency conversion PID are connected with the third temperature transmitter, the upper tower electric regulating valve and the return tower tank electric regulating valve;
and the electric adjusting valve PID controller is connected with the liquid level transmitter and the water supplementing electric valve.
The outlet of the first variable-frequency water pump and the outlet of the second variable-frequency water pump are communicated with the pipe side inlet of the precooler through a first filter screen and a second filter screen after being connected in parallel through a pipeline.
The first filter screen and the second filter screen are arranged in parallel.
The outlet of the pipe side of the precooler is communicated with the inlet of the cooling water main pipeline regulating valve through a first flowmeter, a first temperature transmitter, a pressure transmitter and the inlet of the cooling water main pipeline regulating valve.
The water replenishing pipeline is communicated with the inlet of the cooling water tower pool through a water replenishing electric valve and a second flowmeter.
The temperature control method of the supercritical carbon dioxide cycle power generation precooler comprises the steps of controlling the temperature of carbon dioxide at the hot side outlet of the precooler, controlling the temperature of cooling water and controlling the liquid level of a cooling tower.
The specific process of controlling the temperature of the carbon dioxide at the hot side outlet of the precooler comprises the following steps:
subtracting a set value from the temperature of carbon dioxide at the hot side outlet of the precooler output by the second temperature transmitter to obtain a deviation, and then inputting the deviation into a main pipeline valve adjusting PID controller and a water pump frequency converter PID controller, wherein the main pipeline valve adjusting PID controller and the water pump frequency converter PID controller adopt a one-to-one operation mode; when the switching condition I is met, starting a main pipeline valve adjusting PID controller to control the opening degree of a cooling water main pipeline valve adjusting, wherein the first variable frequency water pump or the second variable frequency water pump tracks the minimum given frequency; and when the switching condition II is met, starting a water pump frequency converter PID controller to control a frequency converter of the first frequency conversion water pump or the second frequency conversion water pump, wherein the opening degree of the cooling water main pipeline adjusting valve is larger than 95% and the cooling water main pipeline adjusting valve is in a tracking state.
When any one of the following conditions is met, starting a main pipeline valve adjusting PID controller, namely:
11) the frequency converter of the first frequency conversion water pump or the second frequency conversion water pump is automatically switched, the cooling water main pipeline regulating valve is automatically switched, and the opening degree of the cooling water main pipeline regulating valve is less than 95 percent or the frequency converter instruction of the first frequency conversion water pump or the second frequency conversion water pump is less than 25 Hz;
12) manually controlling a frequency converter of the first variable-frequency water pump or the second variable-frequency water pump;
when any one of the following conditions is met, switching to a water pump frequency converter PID controller, namely:
21) the frequency converter of the first frequency conversion water pump or the second frequency conversion water pump is automatically switched, the cooling water main pipeline regulating valve is automatically switched, and the opening degree of the cooling water main pipeline regulating valve is more than 95 percent;
22) and the cooling water main pipeline regulating valve is manually controlled.
The concrete process of the control of the cooling water temperature is as follows:
inputting the deviation between the temperature of the cooling water output by the third temperature transmitter and a set value into a valve adjusting PID controller and a fan frequency conversion PID controller, wherein the valve adjusting PID controller and the fan frequency conversion PID controller adopt a standby working mode, and when a switching condition I is met, the valve adjusting PID controller is started to control the opening degrees of the upper tower electric regulating valve and the tower return pool electric regulating valve, wherein the upper tower electric regulating valve and the tower return pool electric regulating valve are always in opposite states; and when the switching condition II is met, starting the fan frequency conversion PID controller to control the frequency converter of the frequency conversion fan.
When any one of the following conditions is met, starting the valve regulating PID controller, namely:
31) the variable frequency fan is automatically switched, the upper tower electric regulating valve is automatically switched, the return tower tank electric regulating valve is automatically switched, and the opening of the upper tower electric regulating valve is less than 98 percent or the instruction of the variable frequency fan is less than 25 Hz;
32) manually controlling a variable frequency fan;
when any one of the following conditions is met, starting the fan variable-frequency PID controller, namely:
41) the variable frequency fan is automatically switched, the electric regulating valve for going up the tower is automatically switched, the electric regulating valve for returning to the tower pool is automatically switched, and the opening of the electric regulating valve for going up the tower is more than 98 percent;
42) manually controlling an electric regulating valve of the upper tower;
43) and manually controlling the electric regulating valve of the tower returning pool.
The invention has the following beneficial effects:
when the temperature control system and the method for the supercritical carbon dioxide cycle power generation precooler are specifically operated, the temperature of carbon dioxide at the outlet of the hot side of the precooler, the temperature of cooling water and the liquid level of a cooling tower are controlled, the electric energy is saved to the maximum extent by using hybrid control, and meanwhile, the temperature of the precooler in the supercritical carbon dioxide cycle power generation is controlled, so that the operating pressure of operators is reduced; in addition, because system equipment operates in the optimal working condition, the system resistance is minimum, the station service power consumption can be reduced, and the electric energy can be saved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a logic diagram of the present invention.
Wherein, 1 is the first frequency conversion water pump, 2 is the second frequency conversion water pump, 3 is first filter screen, 4 is the second filter screen, 5 is the precooler, 6 is the second temperature transmitter, 7 is first flowmeter, 8 is first temperature transmitter, 9 is pressure transmitter, 10 is cooling water main line transfer valve, 11 is upper tower electrical control valve, 12 is return tower pond electrical control valve, 13 is the inverter fan, 14 is precooler by the valve, 15 is the third temperature transmitter, 16 is the moisturizing motorised valve, 17 is the second flowmeter, 18 is cooling water tower pond 18, 19 is the cooling tower, 20 is the liquid level transmitter.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the temperature control system of the supercritical carbon dioxide cycle power generation precooler comprises a main pipeline valve regulating PID controller, a water pump frequency converter PID controller, a valve regulating PID controller, a fan frequency conversion PID, an electric valve regulating PID controller, a first frequency conversion water pump 1, a second frequency conversion water pump 2, a first filter screen 3, a second filter screen 4, a precooler 5, a second temperature transmitter 6, a first flow meter 7, a first temperature transmitter 8, a pressure transmitter 9, a cooling water main pipeline valve regulating 10, an upper tower electric regulating valve 11, a return tower pool electric regulating valve 12, a frequency conversion fan 13, a precooler side valve 14, a third temperature transmitter 15, a water supplementing electric valve 16, a second flow meter 17, a cooling water tower pool 18, a cooling tower 19 and a liquid level transmitter 20;
the bottom outlet of the cooling water tower pool 18 is communicated with the inlet of a first variable frequency water pump 1 and the inlet of a second variable frequency water pump 2 through a third temperature transmitter 15, the first variable frequency water pump 1 is communicated with the second variable frequency water pump 2 in parallel, the outlet of the first variable frequency water pump 1 and the outlet of the second variable frequency water pump 2 are divided into two paths after being connected in parallel through a pipeline and a pipe, wherein one path is communicated with the inlet of the cooling water tower pool 18 through a precooler side valve 14, the other path is communicated with the pipe side inlet of a precooler 5 through a first filter screen 3 and a second filter screen 4, the first filter screen 3 and the second filter screen 4 are arranged in parallel, the pipe side outlet of the precooler 5 is communicated with the inlets of a first flowmeter 7, a first temperature transmitter 8, a pressure transmitter 9 and a cooling water main pipeline regulating valve 10, the outlet of the cooling water main pipeline regulating valve 10 is divided into two paths, wherein one path is communicated with a spray head in the cooling tower 19 through an upper tower electric regulating valve 11, the other path is communicated with the inlet of a cooling water tower pool 18 through an electric regulating valve 12 of the tower returning pool, a cooling tower 19 is positioned above the cooling water tower pool 18, the bottom opening of the cooling tower 19 is opposite to the cooling water tower pool 18, and a variable frequency fan 13 is arranged at the top opening of the cooling tower 19.
A liquid level transmitter 20 is arranged in the cooling water tower pool 18, and a water supplementing pipeline is communicated with the inlet of the cooling water tower pool 18 through a water supplementing electric valve 16 and a second flowmeter 17.
The carbon dioxide outlet of the heat regenerator is communicated with the shell-side inlet of the precooler 5, and the shell-side outlet of the precooler 5 is communicated with the compressor surge tank through a second temperature transmitter 6.
A main pipeline valve adjusting PID controller and a water pump frequency converter PID controller are connected with a second temperature transmitter 6, a cooling water main pipeline valve adjusting 10, a first variable frequency water pump 1 and a second variable frequency water pump 2; the valve adjusting PID controller and the fan frequency conversion PID are connected with the third temperature transmitter 15, the upper tower electric regulating valve 11 and the return tower tank electric regulating valve 12; the electric adjusting valve PID controller is connected with the liquid level transmitter 20 and the water supplementing electric valve 16.
Referring to fig. 2, the method for controlling the compressor system of the supercritical carbon dioxide cycle power generation of the present invention comprises the following steps:
step one
Taking the temperature of carbon dioxide at the outlet of the hot side of the precooler 5 output by the second temperature transmitter 6 as the measured values of the first variable frequency water pump 1, the second variable frequency water pump 2 and the cooling water main pipeline regulating valve 10, subtracting the measured values from the set values to obtain a deviation, and then inputting the deviation into a main pipeline regulating valve PID controller and a water pump frequency converter PID controller, wherein the main pipeline regulating valve PID controller and the water pump frequency converter PID controller adopt a standby operation mode; when the switching condition I is met, starting a main pipeline valve adjusting PID controller to control a cooling water main pipeline valve adjusting 10, and at the moment, tracking the minimum given frequency of 20Hz by the first variable frequency water pump 1 or the second variable frequency water pump 2; and when the switching condition II is met, starting a water pump frequency converter PID controller to control a frequency converter of the first variable frequency water pump 1 or the second variable frequency water pump 2, wherein the opening degree of the cooling water main pipeline regulating valve 10 is larger than 95% and the cooling water main pipeline regulating valve is in a tracking state.
The specified switching condition is to meet the requirement of automatic control of the temperature of the carbon dioxide at the hot side outlet of the precooler 5 in the whole process, when the system is in the starting process, the first variable frequency water pump 1 and the second variable frequency water pump 2 operate under the minimum output working condition, the temperature of the carbon dioxide at the hot side outlet of the precooler 5 is preferentially controlled by the cooling water main pipeline regulating valve 10, when the opening degree of the cooling water main pipeline regulating valve 10 is greater than 95%, the system is automatically switched to a water pump frequency converter PID controller, the cooling water main pipeline regulating valve 10 keeps the maximum opening degree, and the frequency converter of the first variable frequency water pump 1 or the second variable frequency water pump 2 starts to regulate the temperature of the carbon dioxide at the hot side outlet of the precooler 5; when the system is in a stopping process, the frequency of the frequency converter of the first variable frequency water pump 1 or the second variable frequency water pump 2 is gradually reduced, and when the frequency is reduced to below 25Hz, the frequency converter is automatically switched to the main pipeline valve adjusting PID controller, so that the full-working-condition automatic control of the temperature of the carbon dioxide at the hot side outlet of the precooler 5 is completed.
Step two
In order to improve the control effect, the temperature of the cooling water is controlled in a constant range, the temperature of the cooling water output by the third temperature transmitter 15 is used as a process value of the variable frequency fan 13 and the electric regulating valve 11 of the upper tower, the deviation between the temperature of the cooling water and a set value is calculated and then input into a regulating valve PID controller and a fan variable frequency PID controller, wherein, the valve adjusting PID controller and the fan frequency conversion PID controller adopt a working mode of one standby and one use, when the switching condition one is met, then the valve adjusting PID controller is started to control the upper tower electric regulating valve 11 and the return tower tank electric regulating valve 12, wherein, the upper tower electric regulating valve 11 and the tower return pool electric regulating valve 12 are always in opposite states, the regulating valve PID controller outputs two fold line functions corresponding to the upper tower electric regulating valve 11 and the tower return pool electric regulating valve 12, namely, when the command of the upper tower electric control valve 11 is 0, the command of the return tower tank electric control valve 12 is 100; on the contrary, when the command of the upper tower electric control valve 11 is 100, the command of the return tower tank electric control valve 12 is 0; and when the switching condition II is met, starting the fan frequency conversion PID controller to control the frequency converter of the frequency conversion fan 13.
It should be noted that the specified switching condition is to satisfy the cooling water temperature whole-process automatic control, when the system is in the startup process, the variable frequency fan 13 operates in the minimum output working condition, the valve-adjusting priority controls the cooling water temperature, when the opening of the upper tower electric control valve 11 is greater than 98%, the control is automatically switched to the control of the variable frequency fan 13, the upper tower electric control valve 11 keeps the maximum opening, the tower return pool electric control valve 12 is fully closed, and the frequency converter of the first variable frequency water pump 1 or the second variable frequency water pump 2 starts to adjust the cooling water temperature; when the system is in a stopping process, the frequency of the frequency converter of the variable frequency fan 13 is gradually reduced, and when the frequency is reduced to below 25Hz, the frequency is automatically switched to a valve adjusting PID controller, so that the full working condition automatic control of the cooling water temperature is completed.
Step three
As the cooling water evaporates, the amount of the cooling water decreases, the liquid level of the cooling tower 19 output from the liquid level transmitter 20 is differentiated from the design value, and the differentiated result is input to the electric control valve PID controller to control the water replenishment electric valve 16.
When any one of the following conditions is met, starting a main pipeline valve adjusting PID controller, namely:
11) the frequency converter of the first frequency conversion water pump 1 or the second frequency conversion water pump 2 is automatically switched, the cooling water main pipeline adjusting valve 10 is automatically switched, and the opening degree of the cooling water main pipeline adjusting valve 10 is less than 95 percent or the frequency converter instruction of the first frequency conversion water pump 1 or the second frequency conversion water pump 2 is less than 25 Hz;
12) and the frequency converter of the first variable frequency water pump 1 or the second variable frequency water pump 2 is manually controlled.
When any one of the following conditions is met, switching to a water pump frequency converter PID controller, namely:
21) the frequency converter of the first variable frequency water pump 1 or the second variable frequency water pump 2 is automatically switched, the cooling water main pipeline regulating valve 10 is automatically switched, and the opening degree of the cooling water main pipeline regulating valve 10 is more than 95%;
22) the cooling water main line regulating valve 10 is manually controlled.
When any one of the following conditions is met, starting the valve regulating PID controller, namely:
31) the variable frequency fan 13 is automatically switched, the electric regulating valve 11 for going up the tower is automatically switched, the electric regulating valve 12 for returning to the tower pool is automatically switched, and the opening of the electric regulating valve 11 for going up the tower is less than 98 percent or the instruction of the variable frequency fan 13 is less than 25 Hz;
32) the variable frequency fan 13 is manually controlled.
When any one of the following conditions is met, starting the fan variable-frequency PID controller, namely:
41) the variable frequency fan 13 is automatically switched, the electric regulating valve for going up the tower is automatically switched, the electric regulating valve 12 for returning to the tower tank is automatically switched, and the opening of the electric regulating valve 11 for going up the tower is more than 98 percent;
42) the electric regulating valve 11 of the upper tower is manually controlled;
43) the electric regulating valve 12 of the tower returning pool is manually controlled.
Claims (10)
1. A temperature control system of a supercritical carbon dioxide cycle power generation precooler is characterized by comprising a main pipeline valve adjusting PID controller, a water pump frequency converter PID controller, a valve adjusting PID controller, a fan frequency conversion PID, an electric valve adjusting PID controller, a first frequency conversion water pump (1), a second frequency conversion water pump (2), a precooler (5), a second temperature transmitter (6), a first temperature transmitter (8), a cooling water main pipeline valve (10), an upper tower electric regulating valve (11), a return tower pool electric regulating valve (12), a frequency conversion fan (13), a precooler side valve (14), a third temperature transmitter (15), a water supplementing electric valve (16), a cooling water tower pool (18), a cooling tower (19) and a liquid level transmitter (20);
the bottom outlet of the cooling water tower pool (18) is communicated with the inlet of a first variable frequency water pump (1) and the inlet of a second variable frequency water pump (2) through a third temperature transmitter (15), the first variable frequency water pump (1) is communicated with the second variable frequency water pump (2) in parallel, the outlet of the first variable frequency water pump (1) and the outlet of the second variable frequency water pump (2) are divided into two paths after being connected in parallel through a pipeline, one path is communicated with the inlet of the cooling water tower pool (18) through a precooler side valve (14), the other path is communicated with the pipe side inlet of a precooler (5), the pipe side outlet of the precooler (5) is communicated with the inlet of a cooling water main pipeline regulating valve (10) through a first temperature transmitter (8), the outlet of the cooling water main pipeline regulating valve (10) is divided into two paths, one path is communicated with a spray header in a cooling tower (19) through an upper tower electric regulating valve (11), the other path is communicated with an inlet of a cooling water tower pool (18) through an electric regulating valve (12) of the tower returning pool, a cooling tower (19) is positioned above the cooling water tower pool (18), the bottom opening of the cooling tower (19) is opposite to the cooling water tower pool (18), and a variable frequency fan (13) is arranged at the top opening of the cooling tower (19);
a liquid level transmitter (20) is arranged in the cooling water tower pool (18), and a water supplementing pipeline is communicated with an inlet of the cooling water tower pool (18) through a water supplementing electric valve (16);
a main pipeline valve adjusting PID controller and a water pump frequency converter PID controller are connected with a second temperature transmitter (6), a cooling water main pipeline valve adjusting (10), a first variable frequency water pump (1) and a second variable frequency water pump (2);
the valve adjusting PID controller and the fan frequency conversion PID are connected with a third temperature transmitter (15), an upper tower electric regulating valve (11) and a return tower pool electric regulating valve (12);
the electric adjusting valve PID controller is connected with the liquid level transmitter (20) and the water supplementing electric valve (16).
2. The temperature control system of the precooler for supercritical carbon dioxide cycle power generation as claimed in claim 1, wherein the outlet of the first variable frequency water pump (1) and the outlet of the second variable frequency water pump (2) are connected with the inlet of the precooler (5) at the pipe side through the first filter screen (3) and the second filter screen (4) after being connected in parallel through a pipeline.
3. The supercritical carbon dioxide cycle power generation precooler temperature control system of claim 2, wherein the first filter (3) is arranged in parallel with the second filter (4).
4. The system for controlling the temperature of the precooler for supercritical carbon dioxide cycle power generation as claimed in claim 1, wherein the outlet on the pipe side of the precooler (5) is communicated with the inlet of the cooling water main pipeline regulating valve (10) through the first flow meter (7), the first temperature transmitter (8), the pressure transmitter (9).
5. The system as claimed in claim 4, wherein the water supply pipeline is communicated with the inlet of the cooling water tower pool (18) through a water supply electric valve (16) and a second flow meter (17).
6. A temperature control method of a supercritical carbon dioxide cycle power generation precooler is characterized in that the temperature control system of the supercritical carbon dioxide cycle power generation precooler based on the claim 1 comprises the control of the temperature of carbon dioxide at the hot side outlet of a precooler (5), the control of the temperature of cooling water and the control of the liquid level of a cooling tower (19).
7. The temperature control method of the supercritical carbon dioxide cycle power generation precooler as claimed in claim 6, wherein the specific process of controlling the temperature of the carbon dioxide at the hot side outlet of the precooler (5) is as follows:
subtracting a set value from the temperature of carbon dioxide at the hot side outlet of the precooler (5) output by the second temperature transmitter (6) to obtain a deviation, and then inputting the deviation into a main pipeline valve adjusting PID controller and a water pump frequency converter PID controller, wherein the main pipeline valve adjusting PID controller and the water pump frequency converter PID controller adopt a one-to-one operation mode; when the switching condition I is met, starting a main pipeline adjusting valve PID controller to control the opening degree of a cooling water main pipeline adjusting valve (10), and tracking the minimum given frequency by the first variable frequency water pump (1) or the second variable frequency water pump (2); and when the switching condition II is met, starting a water pump frequency converter PID controller to control a frequency converter of the first frequency conversion water pump (1) or the second frequency conversion water pump (2), wherein the opening degree of the cooling water main pipeline regulating valve (10) is larger than 95% and is in a tracking state.
8. The method for controlling the temperature of the precooler for supercritical carbon dioxide cycle power generation as claimed in claim 7, wherein the main pipeline valve adjusting PID controller is started when any one of the following conditions is met, namely:
11) the frequency converter of the first frequency conversion water pump (1) or the second frequency conversion water pump (2) is automatically switched, the cooling water main pipeline regulating valve (10) is automatically switched, the opening degree of the cooling water main pipeline regulating valve (10) is less than 95%, or the frequency converter instruction of the first frequency conversion water pump (1) or the second frequency conversion water pump (2) is less than 25 Hz;
12) the frequency converter of the first variable-frequency water pump (1) or the second variable-frequency water pump (2) is manually controlled;
when any one of the following conditions is met, switching to a water pump frequency converter PID controller, namely:
21) the frequency converter of the first variable frequency water pump (1) or the second variable frequency water pump (2) is automatically switched, the cooling water main pipeline regulating valve (10) is automatically switched, and the opening degree of the cooling water main pipeline regulating valve (10) is more than 95 percent;
22) the cooling water main pipeline adjusting valve (10) is manually controlled.
9. The method for controlling the temperature of the precooler for supercritical carbon dioxide cycle power generation as claimed in claim 7, wherein the specific process of controlling the temperature of the cooling water is as follows:
deviation between the temperature of cooling water output by a third temperature transmitter (15) and a set value is input into a valve adjusting PID controller and a fan frequency conversion PID controller, wherein the valve adjusting PID controller and the fan frequency conversion PID controller adopt a working mode for one use after another, and when a switching condition one is met, the valve adjusting PID controller is started to control the opening degrees of an upper tower electric regulating valve (11) and a tower return pool electric regulating valve (12), wherein the upper tower electric regulating valve (11) and the tower return pool electric regulating valve (12) are always in opposite states; and when the switching condition II is met, starting the fan frequency conversion PID controller to control the frequency converter of the frequency conversion fan (13).
10. The supercritical carbon dioxide cycle power generation precooler temperature control method according to claim 9, wherein the valve adjusting PID controller is activated when any one of the following conditions is satisfied:
31) the variable frequency fan (13) is automatically switched, the electric regulating valve (11) for going up the tower is automatically switched, the electric regulating valve (12) for returning to the tower pool is automatically switched, and the opening degree of the electric regulating valve (11) for going up the tower is less than 98 percent or the instruction of the variable frequency fan (13) is less than 25 Hz;
32) the variable frequency fan (13) is manually controlled;
when any one of the following conditions is met, starting the fan variable-frequency PID controller, namely:
41) the variable frequency fan (13) is automatically switched, the electric regulating valve for going up the tower is automatically switched, the electric regulating valve (12) for returning to the tower pool is automatically switched, and the opening degree of the electric regulating valve (11) for going up the tower is more than 98 percent;
42) the electric regulating valve (11) of the upper tower is manually controlled;
43) the electric regulating valve (12) of the tower returning pool is manually controlled.
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| CN114815918B (en) | 2023-09-19 |
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