Superheated steam drying powder making type coal-fired power generation system

Abstract

The invention provides a superheated steam drying powder making type coal-fired power generation system which is used for driving a power generator to generate power after raw coal is burned. The coal-fired power generation system comprises a boiler unit and a turbine unit, wherein the boiler unit comprises a powder making sub system, a boiler main machine sub system, a wind and powder feeding sub system and a waste steam and water recycling sub system; the turbine unit comprises a water feeding pipe, a steam conveying pipe and a steam turbine. The powder making sub system comprises a steam powder generating and drying device, a steam powder separating device and a drying agent generating device. The drying agent generating device comprises a waste steam pumped steam heater and a waste steam smoke heater, wherein the waste steam pumped steam heater is used for preheating the waste steam through the condensation released heat generated by the steam pumped from the steam turbine to form the hot waste steam, and the waste steam smoke heater is used for further heating the hot waste steam through the smoke from a hearth to form the superheated steam serving as the drying agent. The waste steam and water recycling sub system comprises a waste steam and water recycling device for conducting condensation recycling on one part of the waste steam through the environmental cold air.

Description

technical field [0001] The invention relates to the field of coal-fired power generation, in particular to boiler air supply, superheated steam drying pulverization, coal moisture recovery technology and superheated steam drying pulverization type coal-fired power generation system. 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 country. Ab...

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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