Study on Variable Working Condition Characteristics of 600 MW Direct Air Cooling Condenser

doi:10.12096/j.2096-4528.pgt.21089

Abstract

Abstract:

The coal consumption of direct air cooling unit is higher than that of wet cooling unit, and its back pressure is easily affected by environmental factors. Therefore, it is of great significance to study the exhaust pressure characteristics of air condensing unit under variable working conditions for the safe and economic operation of the unit.The ε-NTU method was used to establish the mathematical model of the 600 MW direct air cooling unit under the condensing condition. The characteristic curves of the condenser under the condensing condition were calculated. The effects of the face wind speed, ambient temperature and exhaust flow rate on the exhaust pressure were analyzed. The conclusions are as follows: When the ambient temperature is higher and the exhaust steam flow is constant, the back pressure economy is better when the head wind speed is 2.5 m/s. During the period of high temperature in summer, the exhaust steam pressure of condenser increases significantly with the increase of exhaust steam flow and the decrease of head-on wind speed. It is necessary for the unit to operate under limited load and appropriately increase the fan speed to reduce the back pressure. When the ambient temperature is low, the exhaust steam flow rate and the face wind speed have little influence on the exhaust steam pressure of the condenser, so it is necessary to take anti-freezing measures. Appropriately increasing the exhaust steam pressure of the condenser is beneficial to the safe operation of the air-cooled island.

Key words: direct air cooling, condenser, variable working condaton, characteristic curve, run advice

CLC Number:

TK 261

Liuming AN, Jizhen AN, Yifan LIU, Gang XU, Ji LI. Study on Variable Working Condition Characteristics of 600 MW Direct Air Cooling Condenser[J]. Power Generation Technology, 2022, 43(6): 935-941.

Figures/Tables 9

Fig. 1 Iterative calculation flow chart

Tab. 1 Condenser design parameters

排汽压力/

kPa

排汽流量/

(t∙h^-1)

迎面风速/

(m∙s^-1)

环境温度/

℃

迎风面积/

m²

Fig. 2 Characteristic comparison curves of air cooling condenser

Fig. 3 Characteristic curves of ambient temperature and condenser exhaust pressure under different exhaust flows at 2.31 m/s head wind speed

Fig. 4 Characteristic curves of ambient temperature and condenser exhaust pressure under exhaust flow of 1 167 t/h and different face wind speeds

Fig. 5 Characteristic curves of head wind speed and condenser exhaust pressure under different ambient temperatures with exhaust flow of 1 167 t/h

Fig. 6 Characteristic curves of head wind speed and condenser exhaust pressure under ambient temperature of 33.5 ℃ and different exhaust flows

Fig. 7 Characteristic curves of exhaust flow and condenser exhaust steam pressure under different ambient temperatures at 2.31 m/s head wind speed

Fig. 8 Characteristic curves of exhaust flow and condenser exhaust pressure at ambient temperature of 33.5 ℃ and different head wind speeds

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