A recovery system for desalinated water to absorb waste heat from thermal power plants

Abstract

A recovery system for desalinated water to absorb waste heat from a thermal power plant, which includes a water treatment device (1), a desalinated water recovery slag cooler waste heat device (2), a steam seal cooler (3), a heat pump or heat exchanger (4) and a desalination machine Oxygenator (5), cooling tower (6) and locomotive cooling device (7), characterized in that the desalinated water of the water treatment device (1) is divided into multiple branches, and the waste heat of the slag cooler (2), The steam seal cooler (3), heat pump or heat exchanger (4) is merged into the main pipeline (19) and enters the deaerator (5). The invention can effectively recover steam turbine waste heat and boiler high-temperature slag discharge heat, utilize heat pump or heat exchanger to recover the heat discharged to the atmosphere from circulating cooling water, reduce boiler desalted water heating self-use steam consumption in deaerator, save thermal power plant energy, and improve Heating capacity and economy of thermal power plants.

Description

technical field [0001] The invention relates to a waste heat recovery technology, in particular to a power plant waste heat recovery technology, in particular to a recovery system for desalinated water to absorb heat power plant waste heat. Background technique [0002] At present, for the thermal power plant with back pressure unit used for heating, the exhaust steam is directly sent to the heat user without condensed water recovery. Before entering the deaerator, the water needs to be preheated and boiled to remove oxygen. Therefore, more steam is consumed for heating when replenishing water, and the heating efficiency is reduced. In the circulating cooling water system, there is a large amount of waste heat in the steam turbine auxiliary equipment such as the slag cooler and the steam seal cooler, which needs to be taken away by the circulating cooling water and released into the atmosphere, resulting in a waste of waste heat in the auxiliary system and serious water evap...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to design a solution to the problem that the current boiler desalted water enters the deaerator at a low temperature and needs to consume a large amount of steam for heating, while the circulating water system slag cooler, steam turbine seal and maintenance cooling equipment have a lot of waste of heat. It can absorb the heat of steam turbine seal, slag cooler and maintenance cooling equipment to heat desalted water, so as to increase the temperature of desalted water entering the deaerator to save steam, and recover the excess heat discharged from cooling towers and air coolers. Waste heat recovery system

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