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

Abstract

The invention provides a superheated steam drying powder-making coal-fired power generation system, which is used for driving a generator to generate power after burning of raw coal. The superheated steam drying power-making coal-fired power generation system comprises a boiler unit and a turboset, wherein the boiler unit comprises a powder-making subsystem, a boiler host machine subsystem, an air supply and powder supply subsystem and a dead steam water recovery subsystem; the powder-making subsystem comprises a steam and powder generating and drying device, a steam and powder separating device and a drying agent generating device; a dead steam heater of the drying agent generating device is used for heating dead steam in the dead steam heater by using steam extracted from a steam turbine to form superheated steam; an air preheater is used for heating a portion of environmental cold air to obtain hot air; a portion of the hot air is mixed together with the other portion of the environmental cold air in a primary air mixing chamber, and the mixed air enters an air and powder mixer as primary air; the other portion of the hot air is directly supplied to a pulverized coal burner as secondary air; the pulverized coal burner is used for burning pulverized coal in an air-powder mixture; the pulverized coal burns in a hearth together with the primary air and the secondary air to generate flue gas.

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...

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 it only theoretically feasible to recover moisture from the exhaust gas. Up to now, there has been no engineering application to achieve flue gas water recovery by cooling the exhaust gas of power plant boilers

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