CN-121977871-A - Method and device for evaluating cooling effect of wet cooling unit, electronic equipment and storage medium

CN121977871ACN 121977871 ACN121977871 ACN 121977871ACN-121977871-A

Abstract

The application discloses a method, a device, electronic equipment and a storage medium for evaluating cooling effect of a wet cooling unit, and relates to the technical field of steam turbines, wherein the method comprises the steps of obtaining state parameters of the wet cooling unit, and constructing a correlation correction curve of low-pressure cylinder penultimate temperature and final temperature according to the state parameters; the method comprises the steps of collecting state parameters of a wet cooling unit during operation, respectively calculating single factor correction values of each parameter for the penultimate temperature and the final temperature of a low-pressure cylinder according to an associated correction curve, integrating and superposing the single factor correction values to obtain a comprehensive correction value, calculating a correction temperature after eliminating multi-parameter deviation by combining a temperature actual monitoring value, calculating a cooling effect deviation rate based on a difference value of the correction temperature and a design temperature, and judging a cooling effect according to the cooling effect deviation rate. The method has the technical effects of accurately reducing the real cooling effect of the cooling steam on the blades, realizing quantitative judgment of the cooling effect, providing clear data support for unit operation regulation and control, and guaranteeing the safety and stability of the operation of the wet cooling unit with small volume flow.

Inventors

WU HONGBIN
SHI JINGJIE
WANG XINGGANG
YUN FENG
WANG KE

Assignees

北方联合电力有限责任公司包头第二热电厂

Dates

Publication Date: 20260505
Application Date: 20251230

Claims (10)

1. The method for evaluating the cooling effect of the wet cooling unit is characterized by comprising the following steps of: acquiring state parameters of a wet cooling unit, and constructing a correlation correction curve of the temperature of a penultimate stage and a final stage of a low-pressure cylinder according to the state parameters; collecting state parameters of the wet cooling unit during operation, and respectively calculating single factor correction values of each parameter to the temperature of the penultimate stage and the final stage of the low-pressure cylinder according to the associated correction curve; Integrating and superposing the single-factor correction values to obtain comprehensive correction values, and calculating corrected temperatures after eliminating multi-parameter deviation by combining with temperature actual monitoring values; And calculating a cooling effect deviation rate based on the difference value of the corrected temperature and the design temperature, and judging the cooling effect of the penultimate blade and the final blade according to the cooling effect deviation rate.
2. The method for evaluating the cooling effect of a wet cooling unit according to claim 1, wherein the step of obtaining the state parameter of the wet cooling unit and constructing the associated correction curve of the temperature of the penultimate stage and the final stage of the low-pressure cylinder according to the state parameter comprises the steps of: The opening of a cooling steam regulating valve is regulated to enable the flow of cooling steam to be within a first preset flow threshold value and the temperature of the cooling steam to be within a preset temperature threshold value, the back pressure of a unit is enabled to be within a preset pressure threshold value through the frequency of a vacuum pump set, the opening of a temperature reducing water regulating valve is regulated to enable the flow of temperature reducing water of a low-pressure cylinder to be within a second preset flow threshold value, and temperature data of the penultimate blade and the final blade under corresponding working conditions are collected; and performing curve fitting on the temperature data by adopting a least square method to form nonlinear correction curves of each parameter and temperature.
3. The method for evaluating the cooling effect of a wet cooling unit according to claim 1, wherein the steps of collecting the state parameters of the wet cooling unit during operation, and calculating the single-factor correction value of each parameter for the penultimate temperature and the final temperature of the low pressure cylinder according to the associated correction curve respectively, comprise the following steps: The reference values of four key parameters under the design working condition of the unit are called, and the relative deviation rate of the actual value and the reference value is calculated; And determining a temperature correction coefficient corresponding to each parameter according to the associated correction curve by a table lookup method or an interpolation method, and multiplying the relative deviation rate by the temperature correction coefficient to obtain the single factor correction value.
4. The method for evaluating the cooling effect of the wet cooling unit according to claim 1, wherein the integrating and superposing the single factor correction values to obtain a comprehensive correction value, and calculating the corrected temperature after eliminating the multi-parameter deviation by combining the actual temperature monitoring value comprises the following steps: Adding the four types of single-factor correction values by adopting an algebraic superposition mode to obtain the comprehensive correction value; And calculating the blade temperatures of the penultimate blade and the final blade after correction according to the comprehensive correction value and the temperature actual monitoring value.
5. The method according to claim 1, wherein calculating a cooling effect deviation ratio based on a difference between the corrected temperature and a design temperature, and determining cooling effects of the penultimate blade and the final blade based on the cooling effect deviation ratio, comprises: Calculating a cooling effect deviation rate based on the corrected temperature and the design temperature; and classifying the cooling effect as being better than, equal to or lower than the design value based on a preset deviation rate threshold according to the cooling effect deviation rate.
6. The method for evaluating the cooling effect of a wet cooling unit according to claim 1, further comprising: when the corrected temperature exceeds a first preset temperature threshold value, the opening of a water injection regulating valve of the rear cylinder is regulated to reduce the temperature of the steam exhaust area; and when the corrected temperature is lower than a second preset temperature threshold value, reducing the frequency of the vacuum pump set or adjusting the opening degree of the vacuum breaking valve to increase the back pressure.
7. A wet cooling unit cooling effect evaluation device, comprising: the construction module is configured to acquire state parameters of the wet cooling unit, and construct a correlation correction curve of the temperature of the penultimate stage and the final stage of the low-pressure cylinder according to the state parameters; the first calculating module is configured to collect state parameters of the wet cooling unit during operation and calculate single-factor correction values of all parameters on the temperature of the penultimate stage and the final stage of the low-pressure cylinder according to the associated correction curve; the second calculation module is configured to integrate and superimpose the single-factor correction values to obtain integrated correction values, and calculate corrected temperatures after eliminating multi-parameter deviation by combining with the temperature actual monitoring values; and a determination module configured to calculate a cooling effect deviation rate based on a difference between the corrected temperature and the design temperature, and determine cooling effects of the penultimate blade and the last blade according to the cooling effect deviation rate.
8. An electronic device, comprising: At least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the wet chiller unit cooling effect evaluation method of any one of claims 1-6.
9. A non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the wet cooling unit cooling effect evaluation method according to any one of claims 1 to 6.
10. A computer program product, characterized in that it comprises a computer program which, when executed by a processor, implements the wet cooling unit cooling effect evaluation method according to any one of claims 1-6.

Description

Method and device for evaluating cooling effect of wet cooling unit, electronic equipment and storage medium Technical Field The application relates to the technical field of steam turbines, in particular to a wet cooling unit cooling effect evaluation method and device, electronic equipment and a storage medium. Background Wet cooling units are widely used in thermal power generation systems, and the low pressure cylinders thereof are used for maintaining the temperature safety of the penultimate stage and the final stage blades under the operation mode of small volume flow and usually through the synergistic effect of cooling steam and low pressure cylinder temperature reducing water. Under the working condition, main stream steam in the unit, entering the low-pressure cylinder from the low-pressure communicating pipe is completely blocked, and only a small amount of cooling steam enters the low-pressure cylinder through a special cooling steam pipeline, so that the temperature of the blade is restrained from being too high, the deformation or damage of the blade is avoided, and the stable operation of the unit is ensured. However, because the unit operation environment and the internal conditions are difficult to maintain in the design working condition all the time, key parameters such as cooling steam flow, cooling steam temperature, unit back pressure, low-pressure cylinder temperature reduction water flow and the like often deviate from the design values. These parameter deviations may directly interfere with the actual temperature measurements of the penultimate and final stage blades, and if the cooling effect is evaluated by simply directly comparing the actual temperature with the design temperature, the influence of the multiparameter fluctuations on the temperature cannot be stripped, thereby causing distortion in the judgment of the cooling effect. Disclosure of Invention The application provides a method and a device for evaluating cooling effect of a wet cooling unit, electronic equipment and a storage medium. The problems that in the related art, due to the fact that multiple parameters such as cooling steam flow, cooling steam temperature, unit back pressure and low-pressure cylinder temperature reduction water flow are easily influenced by environment and load and deviate from design values, judgment of cooling effect is distorted and quantitative evaluation cannot be achieved can be solved. According to a first aspect of the present application, there is provided a cooling effect evaluation method of a wet cooling unit, including: Acquiring state parameters of a wet cooling unit, and constructing a correlation correction curve of the temperature of the penultimate stage and the final stage of the low-pressure cylinder according to the state parameters; collecting state parameters of a wet cooling unit during operation, and respectively calculating single factor correction values of each parameter on the temperature of the penultimate stage and the final stage of the low-pressure cylinder according to the associated correction curve; integrating and superposing the single-factor correction value to obtain a comprehensive correction value, and calculating a correction temperature after eliminating multi-parameter deviation by combining with a temperature actual monitoring value; And calculating a cooling effect deviation rate based on the difference between the corrected temperature and the design temperature, and judging the cooling effect of the penultimate blade and the final blade according to the cooling effect deviation rate. According to a second aspect of the present application, there is provided a cooling effect evaluation device for a wet cooling unit, comprising: the construction module is configured to acquire state parameters of the wet cooling unit and construct a correlation correction curve of the temperature of the penultimate stage and the final stage of the low-pressure cylinder according to the state parameters; the first calculating module is configured to collect state parameters of the wet cooling unit during operation and calculate single factor correction values of the parameters on the temperature of the penultimate stage and the final stage of the low-pressure cylinder according to the associated correction curve respectively; The second calculation module is configured to integrate and superimpose the single-factor correction values to obtain integrated correction values, and calculate corrected temperatures after eliminating multi-parameter deviation by combining with the actual temperature monitoring values; and a determination module configured to calculate a cooling effect deviation rate based on a difference between the corrected temperature and the design temperature, and determine the cooling effect of the penultimate blade, the last-stage blade, according to the cooling effect deviation rate. According to a third aspect of the present application, there