Method for recycling the afterheat of continuous blowdown extension tank and device thereof

Abstract

The invention discloses a method for recycling the afterheat of a continuous blowdown extension tank and a device thereof. Secondary steam discharged by a second stage continuous blowdown extension tank (6) is connected to an air deaerator (1) by a pipeline (2). Secondary steam discharged by a first stage continuous blowdown extension (5) is connected to a pressure deaerator (3) by a pipeline. The first stage continuous blowdown extension (5) and the second stage continuous blowdown extension tank (6) pass through drainage water of a boiler, the capacity of which is expanded, go into a raw water preheater, change heat with demineralized water, and then send demineralized water into the air deaerator (1) for reusing afterheat. The invention greatly reduces heat loss, increases utilization rate of soft water, provides guarantee for efficient running of boiler water, reduces running cost and maintenance cost, and improves working environment.

Description

Technical field: [0001] The invention relates to a method and a device for recovering and utilizing waste heat in a thermal power plant supporting an alumina plant. Background technique: [0002] In thermal power plants built in support of the alumina industry or coal-fired power plants in the power industry, the quality of the steam produced by the boiler is directly related to the salt content of the boiler water. Although the content of the desalinated feed water is very small, due to the strong evaporation of the furnace water, the salt content of the furnace water is much larger than that of the feed water. In order to ensure the steam quality, it is necessary to maintain the salt content of the boiler water not to exceed a certain amount, so the boiler water must be continuously discharged. However, this leads to a series of contradictions: to maintain a low salt content in the furnace water, it is necessary to increase the blowdown rate. Since the temperature of the ...

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Problems solved by technology

[0003] At present, in the current design of thermal power plants, the continuous blowdown of boilers adopts the method of setting up continuous blowdown to expand the container, but the discharged continuous discharge of secondary steam is directly discharged outside the plant, and the hot water after expansion is directly discharged into the trench, which has caused a lot of waste. The heat loss and the large white fog will affect the environment

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