Coal-fired power generation system with superheated steam drying and pulverization

Abstract

The invention provides a coal-fired power generation system capable of drying superheated steam into powder, which is used for combusting raw coal and then drying a generator to generate power and comprises a boiler unit and a steam turbine unit, wherein the boiler unit comprises a powder making subsystem, a boiler host subsystem, an air-powder supply subsystem and a waste steam water recycling subsystem; the powder making subsystem comprises a steam-powder generating and drying device, a steam-powder separation device and a drying agent generating device; the boiler host subsystem comprises a boiler hearth, a boiler smoke channel and a pulverized coal combustor; the waste steam water recycling subsystem comprises a waste steam water recycling device which is connected with the steam turbine and is used for condensing and recycling one part of the waste steam by virtue of the low-temperature condensation water of a steam turbine; the drying agent generating device comprises a waste steam heater and a superheated steam pipeline which is used for conveying a drying agent to the steam-powder generating and drying device to circulate; a waste steam heater is used for heating the waste steam in the waste steam heater by virtue of the smoke of the boiler hearth to form the superheated steam which is used as the drying agent.

Description

technical field [0001] The invention relates to the field of coal-fired power generation, in particular to a superheated steam drying pulverization type coal-fired power generation system with boiler air supply, superheated steam drying pulverization, and coal moisture recovery technology. Background technique [0002] my country is a country rich in coal but lacking in oil and gas. Coal has always been in the core dominant position in my country's energy supply. For a long time to come, the energy structure dominated by coal will continue in my country. Because coal-fired power stations have the characteristics of large-scale concentrated use of coal, which is conducive to efficient and clean utilization of coal, coal is mainly used for power generation at home and abroad. At present in my country, 55% of the total coal output is used for coal-fired thermal power generation. In terms of power structure, thermal power generation is the main power generation method in my coun...

AI Technical Summary

Problems solved by technology

It can be seen that due to the huge amount of dry flue gas and the low water dew point, the recovery of moisture in the exhaust gas requires a huge flue gas cooling heat exchanger and a large amount of cooling medium with a sufficiently low temperature, which makes the recovery of moisture from the exhaust gas and the latent heat of condensation of water vapor extremely difficult. Therefore, there is no engineering application to realize the recovery of flue gas water and heat recovery by cooling the exhaust gas of power plant boilers

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