CN-116105510-B - Anti-freezing control system and method for direct air cooling unit

Abstract

The invention relates to an antifreezing control system and method for a direct air cooling unit, and belongs to the field of air cooling units. The invention relates to an antifreezing control system of a direct air cooling unit, which comprises a steam exhaust device, an air cooling island steam inlet butterfly valve, a distributing pipe, a vacuumizing valve, a vacuum pump, a connecting pipeline, an air cooling island, a condensed water collecting tank, condensed water temperature, steam exhaust pressure and condensed water collecting water temperature. The invention can accurately control the temperature of the condensate water collected by the condensate water collecting tank, and realizes the anti-freezing purpose of the air cooling island.

Inventors

• ZHANG ZUZHE
• LIAO YONGHAO
• DENG YUQIANG
• ZHANG XIAOPING
• WANG BO
• LIU SHUAI

Assignees

• 华电电力科学研究院有限公司

Dates

Publication Date

20260512

Application Date

20221216

Claims (5)

1. 1. A method for an antifreezing control system of a direct air cooling unit comprises a direct air cooling system, wherein the direct air cooling system comprises a steam exhaust device, an air cooling island steam inlet butterfly valve, a distributing pipe, a vacuumizing valve, a vacuum pump, a connecting pipeline, an air cooling island, a condensed water collecting water tank, condensed water temperature, a steam exhaust pressure and a condensed water collecting water temperature, the condensed water temperature is arranged in the steam exhaust device, the distributing pipe is arranged at the top of the air cooling island, the condensed water collecting water tank is arranged at the bottom of the air cooling island, the condensed water collecting water tank is arranged in the condensed water collecting water tank, the condensed water collecting water tank is connected with the steam exhaust device through the connecting pipeline and extends to the inside of the steam exhaust device, the distributing pipe is connected with the air cooling island steam inlet butterfly valve through the connecting pipeline and then connected with the steam exhaust device, the connecting pipeline is arranged at the side close to the steam exhaust device, and the countercurrent tube bundle of the air cooling island is connected with the vacuumizing valve through the connecting pipeline, and then connected with the vacuum pump.
2. 2. The method of the antifreeze control system of the direct air cooling unit of claim 1, wherein the exhaust pressure is obtained by converting the pressure of the condensed water temperature by a water and water vapor property table, and instead of the exhaust pressure, the exhaust pressure after converting the condensed water temperature and the exhaust pressure after converting the condensed water temperature are set to P 1 =P 0 =exhaust pressure; the specific formula is as follows, P 1 =f (x+a); P 1 =P 0 ; Wherein x = condensate temperature; a=constant, condensate supercooling degree design value; f, converting the temperature into pressure by a water and steam property table.
3. 3. The method of the antifreeze control system of the direct air cooling unit of claim 1, wherein the condensed water temperature and the condensed water collecting water temperature are respectively arranged in the steam exhaust device and the condensed water collecting water tank, and are respectively arranged at the upstream and the downstream of a connecting pipeline between the steam exhaust device and the condensed water collecting water tank, and the variation trend of the condensed water temperature is the same as the variation trend of the condensed water collecting water temperature; The condensed water collecting water temperature is calculated by the condensed water temperature to replace the condensed water collecting water temperature; the specific formula is as follows, t 1 =x+b; Limf(t 1 )=t 0 ; t 1 =t 0 ; Wherein t 1 =condensed water collection water temperature after condensed water temperature conversion; x = condensate temperature; b=constant, connecting pipe design temperature drop value; t 0 = condensate collection water temperature.
4. 4. The method for the antifreeze control system of the direct air cooling unit of claim 1, wherein the control of the exhaust pressure is indirectly realized by direct control of the temperature of the condensed water.
5. 5. The method for the anti-freezing control system of the direct air cooling unit according to claim 1, wherein the control of the temperature of the condensed water is indirectly realized through the direct control of the temperature of the condensed water.

Description

Anti-freezing control system and method for direct air cooling unit Technical Field The invention relates to a system and a method, in particular to an antifreezing control system and method for a direct air cooling unit, and belongs to the field of air cooling units. Background The exhaust pressure is used as an important parameter of the cold end of the thermal generator set, plays a great role in safe and economic operation of the set, adopts a direct air cooling system, an indirect air cooling system and a mechanical ventilation tower system as main technical means in the north of China, is easy to freeze due to the influence of environmental factors and load of the set in the exhaust pressure control process in winter, and can cause equipment damage when freezing is serious, thereby influencing the safe and economic operation of the set. At present, in order to prevent the freezing phenomenon of equipment, a series of anti-freezing technical means such as ACC control of an air cooling island, warming and heating, anti-freezing protection, frost protection, emergency water discharge and the like are adopted, and the technical means are based on steam water temperature abnormality derived from steam discharge pressure control, so that a series of technical means are adopted, a large amount of resources are consumed, and the anti-freezing cost is increased. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides the direct air cooling unit anti-freezing control system and the direct air cooling unit anti-freezing control method which are reasonable in structural design, safe and reliable and have the control method meeting the requirements, so that the condensed water collecting temperature is controlled rapidly and accurately, and the anti-freezing purpose of the direct air cooling unit is achieved. The method for solving the problems comprises a direct air cooling system, wherein the direct air cooling system comprises a steam exhaust device, an air cooling island steam inlet butterfly valve, a distributing pipe, a vacuumizing valve, a vacuum pump, a connecting pipeline, an air cooling island, a condensate water collecting tank, condensate water temperature, steam exhaust pressure and condensate water collecting water temperature, the condensate water temperature is arranged in the steam exhaust device, the distributing pipe is arranged at the top of the air cooling island, the condensate water collecting tank is arranged at the bottom of the air cooling island, the condensate water collecting water temperature is arranged in the condensate water collecting tank, the condensate water collecting tank is connected with the steam exhaust device through the connecting pipeline and extends to the inside of the steam exhaust device, the distributing pipe is connected with the air cooling island steam inlet butterfly valve through the connecting pipeline and then connected with the steam exhaust device, the connecting pipeline is arranged at the side close to the steam exhaust device, the counter-flow of the air cooling island is connected with the vacuumizing valve through the connecting pipeline and then connected with the vacuum pump, and is characterized by comprising the steps of setting the condensate water temperature in the steam exhaust device, the condensate water collecting point is controlled by the condensate water temperature in real time, and the condensate water temperature is indirectly converted into condensate water temperature, and the condensate water is condensed water is indirectly controlled by the condensate water temperature, and the condensate water temperature is condensed by the condensate water temperature. Preferably, the exhaust pressure is obtained by converting the condensed water temperature through a water and steam property table, and is replaced by the exhaust pressure, and the exhaust pressure after converting the condensed water temperature, the exhaust pressure and the exhaust pressure are set to be P 1 = P 0 = P 1＝P0; the specific formula is as follows, P 1 =f (x+a); P1＝P0; Wherein P 1 = condensing water temperature converted exhaust pressure; x = condensate temperature; a=constant, condensate supercooling degree design value; f, converting the temperature into pressure through a water and steam property table; P 0 = exhaust pressure. Preferably, the condensed water temperature and the condensed water collecting water temperature are respectively arranged in the steam exhaust device and the condensed water collecting water tank, and are respectively positioned at the upstream and the downstream of the middle connecting pipeline of the steam exhaust device and the condensed water collecting water tank, and the variation trend of the condensed water temperature is the same as that of the condensed water collecting water temperature; The condensed water collecting water temperature is calculated by the condensed water temperature