Superheated steam drying pulverizing 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 powder making sub system comprises a steam powder generating and drying device, a steam powder separating device and a drying agent generating device for generating a drying agent. A waste steam heater heats the waste steam in the waste team heater through condensation released heat generated by the steam pumped from a steam turbine to form the superheated steam. 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 low-temperature condensed water and the environmental cold wind of the turbine unit. The environmental cold wind is preheated through the heat of the waste steam, and warm wind is obtained. An air preheater heats one part of the warm wind to obtain the hot wind. One part of the hot wind and the other part of the warm wind serve as primary wind and enter a wind powder mixer after being mixed in a primary wind mixer.

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 water recovery technology and a superheated steam drying pulverization coal-fired power generation system utilizing steam extraction heat of a steam turbine. 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 m...

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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 water vapor condensation extremely difficult. Difficult, so far there is no engineering application to achieve flue gas water recovery and heat recovery by cooling power plant boiler exhaust

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