Machine furnace waste heat coupling and utilizing system with pressure matcher

Abstract

The invention relates to a machine furnace waste heat coupling and utilizing system with a pressure matcher. The machine furnace waste heat coupling and utilizing system comprises a turbine low-pressure cylinder, the pressure matcher, an air heater, an air preheater and a low-temperature coal economizer. The input end of the pressure matcher is connected with the turbine low-pressure cylinder through a low-pressure cylinder gas extraction pipeline and a steam exhaust and extraction pipeline, and the steam exhaust and extraction pipeline is connected with a low-pressure cylinder gas exhaust pipeline, so that low-pressure exhaust gases of a turbine are extracted under the drive of low-pressure gas extraction of the turbine, and steam with pressure between low-pressure steam extraction and low-pressure steam exhaust is generated. The input end of the air heater is connected with the output end of the pressure matcher through a steam pipeline, and the output end of the air heater is connected with the air preheater, so that primary cold air and secondary cold air, which enter the air heater, are preheated by the steam, and the preheated primary cold air and the preheated secondary coldair are outputted to the air preheater. The air preheater is connected with the low-temperature coal economizer. The low-temperature coal economizer is connected with a circulating-water inlet pipeline and a circulating-water outlet pipeline. By the machine furnace waste heat coupling and utilizing system, waste heat utilization of exhaust steam of turbosets is realized.

Description

technical field [0001] The invention belongs to the technical field of thermal power generation, and in particular relates to a coupling utilization system for residual heat of a machine furnace with a pressure matching device. Background technique [0002] For thermal power units, the exhaust steam of the steam turbine takes away a huge amount of energy. The exhaust temperature of the wet-cooled unit can reach 30-50°C, and the exhaust temperature of the air-cooled unit can reach 60-70°C. Effective recovery of waste heat from steam turbine exhaust is a difficult problem, mainly manifested in two aspects: first, the energy level of steam turbine exhaust is not high, and the space for low-temperature exhaust steam is small; second, the specific volume of steam turbine exhaust is extremely large If the exhaust steam is directly used for heat exchange, a large heat exchanger and related pipelines need to be designed, which will increase equipment investment and operating costs, ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a coupling utilization system of machine furnace waste heat with a pressure matching device, so as to solve the problem of utilization of waste heat from steam turbine exhaust

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