Hot air heat utilization system for indirect cooling tower

Abstract

The invention discloses a hot air heat utilization system for an indirect cooling tower. The hot air heat utilization system comprises the indirect cooling tower and an air inlet header; a plurality of air outlets are symmetrically formed in the part above a heat exchange area of the indirect cooling tower, and an annular air extracting box is arranged outside the air outlets and is connected to the outer side of the indirect cooling tower in a sealed mode; an outlet of the annular air extracting box is connected to the air inlet header, and hot air of the indirect cooling tower is conveyed into an air heater by a fan for being heated again after flowing through the air inlet header. According to the hot air heat utilization system, during the low-temperature operation period of a unit, the hot air of the indirect cooling tower is utilized as the air source entering the air heater, and therefore the steam extraction amount of the air heater can be lowered, the operation efficiency of a steam turbine can be improved, the exhaust gas temperature of a boiler can be increased, and blockage and corrosion of an air pre-heater can be reduced; the air extracting box is arranged in an annular mode, and therefore air inletting is stable; during the low-temperature operation period, the coal consumption of power generation can be lowered by 0.5 g / (Kw.h).

Description

【Technical field】 [0001] The invention belongs to the technical field of heat energy reuse, and relates to an indirect cooling tower warm air heat utilization system. 【Background technique】 [0002] In the entire thermal power generation system, the loss of the cold source of the steam turbine accounts for the majority of all losses. Although the energy carried by the working medium in the cold end system of the steam turbine accounts for more than 55% of the heat in the entire thermodynamic cycle, due to the low energy level The low temperature is difficult to be utilized and can only be discharged from the system in the form of waste heat. For the indirect cooling unit, the circulating water of the steam turbine is cooled by the air flowing into the indirect cooling tower, and the heated air is directly discharged into the environment. If the waste heat in part of the heated air can be used, the whole unit can be upgraded. cycle efficiency. [0003] Large-scale generatin...

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Problems solved by technology

[0002] In the entire thermal power generation system, the loss of the cold source of the steam turbine accounts for the majority of all losses. Although the energy carried by the working medium in the cold end system of the steam turbine accounts for more than 55% of the heat in the entire thermodynamic cycle, due to the low energy level It is difficult to be utilized and can only be discharged from the system in the form of waste heat

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