Direct air cooling system with peak cooling device

Abstract

The invention relates to a direct air cooling system with a peak cooling device. The direct air cooling system is used for the condensation process of steam turbine exhaust steam of a thermal power plant. The direct air cooling system comprises a steam exhaust device (1), a steam exhaust pipeline (2), an air-cooled condenser (3) and the peak cooling device. The direct air cooling system is characterized in that the peak cooling device comprises a water-cooled condenser heat exchanger (12), a cooling tower (11) and a circulating water pipeline (10); the water-cooled condenser heat exchanger (12) is arranged in the steam exhaust device (1), so that the steam exhaust device achieves a steam condensation function; the water-cooled condenser heat exchanger (12) is connected with the cooling tower (11) through the circulating water pipeline (10); and the system is additionally provided with a condensate water tank (7) for storing condensate water, the air-cooled condenser (3) is connected with the condensate water tank (7) through a first condensate water pipeline (4), and the steam exhaust device (1) is connected with the condensate water tank (7) through a second condensate water pipeline (8). The direct air cooling system has the beneficial effects that the pressure drop of dead steam in the steam exhaust device and the steam exhaust pipeline is reduced, a flow diversion pipeline and a valve of the peak cooling device are omitted, and the invested cost of the system is reduced.

Description

technical field [0001] The invention relates to a direct air cooling system with a peak cooling device, which is used for the condensation process of steam turbine exhaust in a thermal power plant. Background technique [0002] In the process of thermal power generation, the exhaust steam discharged from the low-pressure cylinder of the steam turbine needs to be condensed into water and then sent back to the boiler for recycling. In order to save water resources, many power plants use direct air cooling system to condense exhaust steam. [0003] At present, the direct air-cooling system is composed of an exhaust device, an exhaust pipe, an air-cooled condenser, and a condensate pipe. After the exhaust steam from the low-pressure cylinder of the steam turbine enters the exhaust device, it is introduced into the air-cooled condenser through the exhaust pipe to be condensed into water, and then returns to the exhaust device. The exhaust device has the function of storing cond...

AI Technical Summary

Problems solved by technology

[0005] 1) Adding pipes and valves on the exhaust pipe to lead the exhaust steam into the water-cooled condenser, the investment cost is high;

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