Machine-boiler coupled heat supply waste heat utilization system

Abstract

The invention provides a machine-boiler coupled heat supply waste heat utilization system. The system comprises a boiler smoke waste heat reuse system, a steam turbine power generating system, a condensate water reheating system and a heating system. The boiler smoke waste heat reuse system comprises smoke-water heat exchangers. The steam turbine power generating system comprises an intermediate-pressure cylinder and a low-pressure cylinder communicating with the intermediate-pressure cylinder. The intermediate-pressure cylinder and the low-pressure cylinder further communicate with the heating system. The condensate water reheating system is used for reheating condensate water obtained after heat of steam used as a heat network circulating water heat source is released and / or condensate water obtained after condensation of a condensation device. The heating system is used for supplying heat to a user side. By means of the system, boiler waste heat and low-grade energy for steam turbine power generation are fully used for heating, and waste of low-grade and high-grade heat energy is reduced; a heat storage tank is arranged, the heat energy can be stored in the power generating high-load period, and the effect of thermoelectric decoupling is achieved; and the temperature of exhaust temperature of a boiler is reduced, the amount of water used for smoke desulfuration is reduced, and the system achieves energy saving and environmental protection and has good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of energy utilization, and in particular relates to a waste heat utilization system coupled with a machine furnace for heat supply. Background technique [0002] my country is rich in coal resources, and coal-fired power stations occupy an important position in the power system. The massive consumption of fossil energy has brought considerable pressure to the environment. Boilers, as the main equipment of thermal power generating units, are thermal power equipment and high-energy Consumption, the main source of high pollution. [0003] The exhaust smoke loss of the boiler is the largest item in the heat loss of the boiler, accounting for about 70-80% of the heat loss of the boiler. Boiler flue gas emissions include solid and gaseous pollutants, as well as thermal pollution caused by excessively high exhaust gas temperature. In coal-fired power stations, the general exhaust gas emission temperature is 120-13...

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Problems solved by technology

[0007] The purpose of the present invention is to provide a boiler-furnace coupled heat supply waste heat utilization system to at least solve the problem that the current exhaust gas temperature of coal-fired power plant boilers is too high, and the waste heat in the tail flue cannot be fully utilized. High-grade thermal energy is used to heat the circulating water for heating, resulting in waste of high-grade energy, serious loss of steam turbine cold source, and large energy waste

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