CN118224078A - Nuclear power station cold machine load control method based on big and small valve switching mode - Google Patents
Nuclear power station cold machine load control method based on big and small valve switching mode Download PDFInfo
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- CN118224078A CN118224078A CN202211630243.4A CN202211630243A CN118224078A CN 118224078 A CN118224078 A CN 118224078A CN 202211630243 A CN202211630243 A CN 202211630243A CN 118224078 A CN118224078 A CN 118224078A
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- guide vane
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- vane valve
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- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 238000010586 diagram Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 3
- 239000003507 refrigerant Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention relates to the technical field of cold machine load control, and particularly discloses a cold machine load control method of a nuclear power station based on a big-small valve switching mode. The method controls the load required by the refrigerator by adjusting the large and small guide vane valves, improves the condition that the refrigerator is poorly adjusted in low load, and improves the running reliability of equipment.
Description
Technical Field
The invention belongs to the technical field of cold load control, and particularly relates to a cold load control method of a nuclear power station based on a big-small valve switching mode.
Background
At present, a cold machine for providing a cold source is controlled by a compressor guide vane valve, the refrigerant quantity required by the compressor guide vane valve controlled refrigerator is sucked, and the cold machine is stopped due to redundant disturbance generated in the valve change process in the single compressor guide vane valve control process when the unit cold source demand is small, namely in a low load state.
Therefore, there is a need to design a cold load control method of a nuclear power plant based on a big and small valve switching mode to solve the above problems.
Disclosure of Invention
The invention aims to provide a nuclear power station cold machine load control method based on a big-small valve switching mode, which is used for realizing accurate control of loads by controlling small and large guide vane valves to adapt to load changes when the low and high loads of a cold machine change.
The technical scheme of the invention is as follows:
The utility model provides a cold machine load control method of nuclear power station based on big or small valve switching mode carries out the control of nuclear power station cold machine load through little guide vane valve and big guide vane valve, and wherein big guide vane valve and little guide vane valve parallel arrangement, when unit cold source demand is in low load state, controls through little guide vane valve, and when unit cold source demand is in high load state, controls through big guide vane valve.
The method comprises the following steps:
Step 1: acquiring a valve total opening instruction;
Step 2: and adjusting the opening degrees of the large guide vane valve and the small guide vane valve.
The step 1 specifically comprises the following steps:
After the cold machine starts to run, the chilled water outlet temperature set in the controller is compared with the chilled water outlet temperature actually detected to obtain a deviation value, and the total opening instruction of the valve corresponding to the current load deviation is obtained after PID operation of the controller.
The step2 specifically comprises the following steps:
sending a valve total opening instruction to a small guide vane valve and a large guide vane valve, and respectively adjusting the opening of the small guide vane valve and the large guide vane valve according to control opening curves of the small guide vane valve and the large guide vane valve;
And when the machine is started, the large guide vane valve is opened after the small guide vane valve is fully opened, and when the machine is shut down, the small guide vane valve is closed after the large guide vane valve is fully closed.
In the step 2, when the total opening instruction of the valve reaches 30%, the influence of the opening of the guide vane valve on the whole load is small;
When the total opening command of the valve is required to be continuously increased from 30%, the large guide vane valve and the small guide vane valve are switched, at the moment, the opening of the small guide vane valve is not increased any more, and the opening of the large guide vane valve is slowly increased until the chilled water outlet temperature is close to the set value of the controller.
In the step 2, the control mode of the small guide vane valve is as follows:
When the total opening instruction of the valve is 0%, the valve does not act;
When the total opening instruction of the valve is more than 0% and less than 30%, the opening instruction of the small guide vane valve is proportionally increased;
When the total opening command of the valve reaches 30%, the small guide vane valve reaches 90% of the maximum opening and reaches the theoretical maximum opening.
In step 1, the actual chilled water outlet temperature is detected by a chilled water outlet temperature sensor.
The invention has the remarkable effects that:
(1) The method controls the load required by the refrigerator by adjusting the large and small guide vane valves, improves the condition that the refrigerator is poorly adjusted in low load, and improves the running reliability of equipment.
(2) The valve opening control mode and the switching instruction parameters of the method can be optimized and adjusted according to different cold machine load requirements, and the application range is wide.
(3) According to the method, through accurately controlling and switching the large guide vane valve and the small guide vane valve, the accurate control output of the valve is realized, the loss of the refrigerant is reduced, and the total energy efficiency of the refrigerant in use is improved.
Drawings
FIG. 1 is a diagram of a chiller valve control logic;
FIG. 2 is a first schematic diagram of a chiller valve switch;
FIG. 3 is a second schematic diagram of a chiller valve switch;
Fig. 4 is a diagram of a chiller big and small valve opening control curve.
Detailed Description
The technical scheme provided by the invention is further described below with reference to the accompanying drawings: the described embodiments are intended to be illustrative of only some, but not all, of the embodiments disclosed herein and, based on the teachings provided herein, all other embodiments that may be made by one of ordinary skill in the art without the benefit of this disclosure are intended to be within the scope of this disclosure.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the terms used in this description of this invention are for the purpose of describing particular embodiments only and are not intended to limit the invention.
According to the cold load control method of the nuclear power station based on the big and small valve switching mode shown in fig. 1, the cold load of the nuclear power station is controlled through the small guide vane valve and the large guide vane valve, wherein the large guide vane valve and the small guide vane valve are arranged in parallel, when the unit cold source demand is small, namely in a low load state, the control is performed through the small guide vane valve, and when the unit cold source demand is large, namely in a high load state, the control is performed through the large guide vane valve.
The method specifically comprises the following steps:
Step1: acquiring a total opening instruction of a valve
After the cold machine starts to run, comparing the chilled water outlet temperature set in the controller with the chilled water outlet temperature actually detected by the chilled water outlet temperature sensor to obtain a deviation value, and obtaining a valve total opening instruction corresponding to the current load deviation after PID operation of the controller;
step 2: adjusting the opening of the large and small vane valves
Sending a valve total opening instruction to a small guide vane valve and a large guide vane valve, and respectively adjusting the opening of the small guide vane valve and the large guide vane valve according to control opening curves of the small guide vane valve and the large guide vane valve; the general control principle is to avoid the vibration of the machine set in the starting or adjusting process of the cold machine, when the cold machine is started, the large guide vane valve is opened after the small guide vane valve is fully opened, and when the cold machine is shut down, the small guide vane valve is closed after the large guide vane valve is fully closed.
As shown in fig. 2 to 4, the control mode of the small guide vane valve is as follows: when the total opening instruction of the valve is 0%, the valve does not act; when the total opening instruction of the valve is in the range of 0% -30% (excluding two end point values), the opening instruction of the valve of the small guide vane is proportionally increased; when the total opening instruction of the valve reaches 30%, the small guide vane valve reaches 90% of the maximum opening and reaches the theoretical maximum opening, and the influence of the opening of the small guide vane valve on the whole load is small;
When the total opening command of the valve is required to be continuously increased from 30%, the large guide vane valve and the small guide vane valve are switched, at the moment, the 90% opening of the small guide vane valve is not increased any more, and the opening of the large guide vane valve is slowly increased until the chilled water outlet temperature is met, and the chilled water outlet temperature approaches to the set value of the controller.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A nuclear power station cold load control method based on a big valve and a small valve switching mode is characterized by comprising the following steps of: and the control of the cold load of the nuclear power station is performed through the small guide vane valve and the large guide vane valve, wherein the large guide vane valve and the small guide vane valve are arranged in parallel, when the unit cold source demand is in a low load state, the control is performed through the small guide vane valve, and when the unit cold source demand is in a high load state, the control is performed through the large guide vane valve.
2. The nuclear power station cold load control method based on the big and small valve switching mode as claimed in claim 1, wherein: the method comprises the following steps:
Step 1: acquiring a valve total opening instruction;
Step 2: and adjusting the opening degrees of the large guide vane valve and the small guide vane valve.
3. The nuclear power station cold load control method based on the big and small valve switching mode as claimed in claim 2, wherein: the step 1 specifically comprises the following steps:
After the cold machine starts to run, the chilled water outlet temperature set in the controller is compared with the chilled water outlet temperature actually detected to obtain a deviation value, and the total opening instruction of the valve corresponding to the current load deviation is obtained after PID operation of the controller.
4. The nuclear power station cold load control method based on the big and small valve switching mode as claimed in claim 2, wherein: the step 2 specifically comprises the following steps:
sending a valve total opening instruction to a small guide vane valve and a large guide vane valve, and respectively adjusting the opening of the small guide vane valve and the large guide vane valve according to control opening curves of the small guide vane valve and the large guide vane valve;
And when the machine is started, the large guide vane valve is opened after the small guide vane valve is fully opened, and when the machine is shut down, the small guide vane valve is closed after the large guide vane valve is fully closed.
5. The nuclear power station cold load control method based on the big and small valve switching mode as claimed in claim 4, wherein: in the step 2, when the total opening instruction of the valve reaches 30%, the influence of the opening of the guide vane valve on the whole load is small; when the total opening command of the valve is required to be continuously increased from 30%, the large guide vane valve and the small guide vane valve are switched, at the moment, the opening of the small guide vane valve is not increased any more, and the opening of the large guide vane valve is slowly increased until the chilled water outlet temperature is close to the set value of the controller.
6. The nuclear power station cold load control method based on the big and small valve switching mode as claimed in claim 5, wherein: in the step 2, the control mode of the small guide vane valve is as follows:
When the total opening instruction of the valve is 0%, the valve does not act;
When the total opening instruction of the valve is more than 0% and less than 30%, the opening instruction of the small guide vane valve is proportionally increased;
When the total opening command of the valve reaches 30%, the small guide vane valve reaches 90% of the maximum opening and reaches the theoretical maximum opening.
7. A method for controlling the cold load of a nuclear power plant based on a big and small valve switching mode as claimed in claim 3, wherein: in step 1, the actual chilled water outlet temperature is detected by a chilled water outlet temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211630243.4A CN118224078A (en) | 2022-12-19 | 2022-12-19 | Nuclear power station cold machine load control method based on big and small valve switching mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211630243.4A CN118224078A (en) | 2022-12-19 | 2022-12-19 | Nuclear power station cold machine load control method based on big and small valve switching mode |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118224078A true CN118224078A (en) | 2024-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211630243.4A Pending CN118224078A (en) | 2022-12-19 | 2022-12-19 | Nuclear power station cold machine load control method based on big and small valve switching mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118224078A (en) |
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2022
- 2022-12-19 CN CN202211630243.4A patent/CN118224078A/en active Pending
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