CN-116465225-B - Cooling tower anti-freezing self-adaptive control system and method based on temperature field measurement

Abstract

The invention discloses a cooling tower anti-freezing self-adaptive control system and method based on temperature field measurement, wherein the system comprises a controller, a cooling tower circulating water inlet pipeline, a circulating water pump, a cooling tower circulating water return pipeline and a plurality of groups of adjustable anti-freezing devices arranged at an air inlet of a cooling tower, an outlet of the cooling tower circulating water inlet pipeline is communicated with a water inlet of the cooling tower through the circulating water pump, a water outlet of the cooling tower is communicated with the cooling tower circulating water return pipeline, a cooling tower water outlet temperature measuring point is arranged at the water inlet of the cooling tower, a cooling tower environment temperature measuring point is arranged at the lower edge of the air inlet of the cooling tower, and the controller is connected with the cooling tower environment temperature measuring point, the cooling tower water outlet temperature measuring point, the circulating water pump and the adjustable anti-freezing devices.

Inventors

• MU QIWEI
• FENG YONGHE
• MIAO XINLONG
• YUE JUN
• SHUI YUAN
• LI HENGHENG
• ZHANG BEN
• WANG HONGWU

Assignees

• 西安热工研究院有限公司
• 黄河西宁热电有限责任公司

Dates

Publication Date

20260505

Application Date

20230310

Claims (6)

1. 1. The cooling tower anti-freezing self-adaptive control method based on temperature field measurement is characterized by comprising a cooling tower anti-freezing self-adaptive control system based on temperature field measurement, wherein the cooling tower anti-freezing self-adaptive control system based on temperature field measurement comprises a controller, a cooling tower circulating water inlet pipeline (7), a circulating water pump (8), a cooling tower circulating water return pipeline (10) and a plurality of groups of adjustable anti-freezing devices (2) arranged at an air inlet of a cooling tower (1); An outlet of the cooling tower circulating water inlet pipeline (7) is communicated with a water inlet of the cooling tower (1) through a circulating water pump (8), a water outlet of the cooling tower (1) is communicated with the cooling tower circulating water return pipeline (10), a cooling tower water outlet temperature measuring point (9) is arranged at the water inlet of the cooling tower (1), and a cooling tower environment temperature measuring point (6) is arranged at the lower edge of the air inlet of the cooling tower (1); the controller is connected with the cooling tower environment temperature measuring point (6), the cooling tower water outlet temperature measuring point (9), the circulating water pump (8) and the adjustable anti-freezing equipment (2); The adjustable anti-freezing device (2) comprises an anti-freezing folding curtain (4) arranged at an air inlet of the cooling tower (1) and an anti-freezing device driving motor (3) for driving the anti-freezing folding curtain (4) to expand or contract, wherein the controller is connected with the anti-freezing device driving motor (3); The method comprises the following steps: The water output by the circulating water inlet pipeline (7) of the cooling tower is sent into the cooling tower (1) for cooling through the circulating water pump (8), and the water output by the cooling tower (1) is discharged through the circulating water return pipeline (10) of the cooling tower; The water outlet temperature of the cooling tower (1) is measured through the water outlet temperature measuring point (9) of the cooling tower, and the environment temperature at the lower edge of the air inlet of the cooling tower (1) is measured through the environment temperature measuring point (6) of the cooling tower; Calculating a detection period The average value of the ambient temperature in t is obtained, and the detection period is calculated The average value of the water outlet temperature in the T is obtained, the average water outlet temperature is preset at the ambient temperature of T 1 ℃ and the safe water outlet temperature of T 2 ℃; And controlling a circulating water pump (8) and an anti-freezing equipment driving motor (3) according to the average ambient temperature and the average water outlet temperature to realize anti-freezing self-adaptive control of the cooling tower.
2. 2. The cooling tower antifreeze self-adaptive control method based on temperature field measurement according to claim 1, wherein the specific operations of controlling the circulating water pump (8) and the antifreeze apparatus driving motor (3) according to the average ambient temperature and average outlet water temperature are: When the average ambient temperature is higher than T 1 ℃ and the average outlet water temperature is higher than T 2 ℃, the antifreezing pressure of the cooling tower (1) is smaller, the opening of the antifreezing folding curtain (4) is increased by P 1 %, and meanwhile, the flow rate of the circulating water pump (8) is reduced by Q%; When the average ambient temperature is greater than T 1 ℃ and the average water outlet temperature is less than T 2 ℃, the antifreeze pressure of the cooling tower (1) is medium, the opening of the antifreeze folding curtain (4) is reduced by P 2 % due to the lower average water outlet temperature, and the next detection period is continuously tracked T, the average cooling water outlet temperature is equal to or higher than T 2 ℃; When the average ambient temperature is less than T 1 ℃ and the average outlet water temperature is more than T 2 ℃, the antifreezing pressure of the cooling tower (1) is medium, and the current state is maintained; When the average ambient temperature is less than T 1 ℃ and the average outlet water temperature is less than T 2 ℃, the method shows that the antifreezing pressure of the cooling tower (1) is larger, the opening of the antifreezing folding curtain (4) is reduced by P 2 %, the flow rate of the circulating water pump (8) is increased by Q%, and the next temperature measurement period is continuously tracked T until the average water outlet temperature is greater than or equal to T 2 ℃.
3. 3. The cooling tower antifreeze self-adaptive control method based on temperature field measurement according to claim 2, wherein T 1 =0.
4. 4. The cooling tower antifreeze self-adaptive control method based on temperature field measurement according to claim 2, wherein T 2 =10.
5. 5. The cooling tower anti-freezing self-adaptive control method based on temperature field measurement according to claim 1, wherein when in operation, the anti-freezing device driving motor (3) is used for controlling the anti-freezing folding curtain (4) to be unfolded or contracted so as to adjust the opening degree of the air inlet of the cooling tower (1), and then adjust the air inlet area of the air inlet of the cooling tower (1).
6. 6. The cooling tower antifreeze self-adaptive control method based on temperature field measurement according to claim 1, wherein the adjustable antifreeze apparatus (2) further comprises a stroke displacement sensor (5) for detecting displacement of the antifreeze folding curtain (4), the stroke displacement sensor (5) being connected with a controller.

Description

Cooling tower anti-freezing self-adaptive control system and method based on temperature field measurement Technical Field The invention belongs to the technical field of operation of steam turbines, and relates to a cooling tower anti-freezing self-adaptive control system and method based on temperature field measurement. Background The cooling tower of the wet cooling unit is designed according to the maximum heat exchange capacity of summer working conditions, so that the circulating water quantity on the cooling tower is obviously reduced when the wet cooling unit is operated in winter peak shaving operation in northern areas, particularly when the wet cooling unit is operated in winter after heat supply modification, the antifreezing pressure of the circulating water on the cooling tower in winter is huge, and the problems of ice hanging, filler layer damage and the like of the cooling tower are easily caused. In addition, the peak shaving operation has extremely high time response requirement on flexible control, and the anti-freezing adjustment difficulty of the cooling tower is further improved. Disclosure of Invention The invention aims to overcome the defects of the prior art, and provides a cooling tower anti-freezing self-adaptive control system and method based on temperature field measurement. In order to achieve the purpose, the cooling tower anti-freezing self-adaptive control system based on temperature field measurement comprises a controller, a cooling tower circulating water inlet pipeline, a circulating water pump, a cooling tower circulating water return pipeline and a plurality of groups of adjustable anti-freezing devices arranged at an air inlet of the cooling tower; An outlet of the cooling tower circulating water inlet pipeline is communicated with a water inlet of the cooling tower through a circulating water pump, a water outlet of the cooling tower is communicated with the cooling tower circulating water return pipeline, a cooling tower water outlet temperature measuring point is arranged at the water inlet of the cooling tower, and a cooling tower environment temperature measuring point is arranged at the lower edge of the cooling tower air inlet; The controller is connected with the cooling tower environment temperature measuring point, the cooling tower water outlet temperature measuring point, the circulating water pump and the adjustable anti-freezing equipment. The adjustable anti-freezing device comprises an anti-freezing folding curtain arranged at the air inlet of the cooling tower and an anti-freezing device driving motor for driving the anti-freezing folding curtain to expand or contract, wherein the controller is connected with the anti-freezing device driving motor. When the anti-freezing device is in operation, the anti-freezing folding curtain is controlled to be unfolded or contracted by the driving motor of the anti-freezing device so as to adjust the opening degree of the air inlet of the cooling tower, and then the air inlet area of the air inlet of the cooling tower is adjusted. The adjustable anti-freezing device further comprises a stroke displacement sensor for detecting the displacement of the anti-freezing folding curtain, and the stroke displacement sensor is connected with the controller. The cooling tower anti-freezing self-adaptive control method based on temperature field measurement comprises the following steps: The water output by the circulating water inlet pipeline of the cooling tower is sent into the cooling tower for cooling through the circulating water pump, and the water output by the cooling tower is discharged through the circulating water return pipeline of the cooling tower; Measuring the outlet water temperature of the cooling tower through the outlet water temperature measuring point of the cooling tower, and measuring the ambient temperature at the lower edge of the air inlet of the cooling tower through the ambient temperature measuring point of the cooling tower; Calculating the average value of the water outlet temperature in the detection period delta T to obtain the average water outlet temperature, presetting the environment temperature T 1 ℃ and the safe water outlet temperature T 2 ℃; And controlling the circulating water pump and the driving motor of the anti-freezing equipment according to the average ambient temperature and the average water outlet temperature to realize anti-freezing self-adaptive control of the cooling tower. The specific operation of controlling the circulating water pump and the driving motor of the anti-freezing equipment according to the average ambient temperature and the average water outlet temperature is as follows: When the average ambient temperature is higher than T 1 ℃ and the average outlet water temperature is higher than T 2 ℃, the antifreezing pressure of the cooling tower is smaller, the opening of the antifreezing folding curtain is increased by P 1%, and meanwhile, the flow rate of