Backheating and heating technology by using residual heat of exhaust steam in steam power cycle

Abstract

It relates to a heat supply technique by using left vapor heat in the vapor power circulation. It mainly uses two-level or multi-level secondary absorbing heat pump technique with absorption and evaporator, with the exhaust gas as the heat source, environment as the cooling source. The exhaust heat return technique can improve vapor power circulating heat efficiency, with better energy saving benefit, realizing two times heating for desalinated sea water. It can reduce coolant consumption with less pollution.

Description

technical field [0001] The invention belongs to the technical field of waste heat utilization and energy-saving equipment and engineering application. Background technique [0002] In the steam power cycle represented by thermal power plants and nuclear power plants, less than half of the heat energy contained in the high-temperature and high-pressure steam entering the steam turbine is converted into mechanical energy, and a large amount of unusable heat energy exists in the low-temperature and low-pressure exhaust at the outlet of the steam turbine. In the steam, the heat energy contained in the exhaust steam is finally released to the environment through the cooling system, and this process is accompanied by the consumption of a large amount of cooling water and thermal pollution to the environment. [0003] The main method to improve the thermal efficiency of the steam power cycle is to adopt heat recovery technology. Generally, steam extraction in the middle of the stea...

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Problems solved by technology

[0005] Although exhaust steam contains a large amount of heat energy, due to its low temperature and pressure, traditional energy-saving technologies cannot recycle it with reasonable process parameters and relatively low engineering cost

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