A method for reducing coal consumption and water recovery of coal-fired generating units by using coal drying and exhaust steam

Abstract

The invention relates to a method of utilizing coal drying exhaust steam to reduce coal consumption of a coal-fired power generator set and recovering water. The method is to add a heat and water recovery system between a coal drying system and the coal-fired power generator set, wherein the heat and water recovery system can convert heat and water vapor carried by the dry tail gas to heat and water carried by hot water, and then the hot water carrying a lot of heat is used for preheating carrier gas entering the coal drying system, air entering a coal-fired boiler system and condensed water after condensing steam by a steam turbine in order to realize efficient transfer of the heat carried by the dry tail gas to the coal-fired power generator set, reduce the coal consumption for the coal-fired power generator set and recover water. The method is characterized by completely recovering and utilizing heat and water vapor carried by the dry tail gas, so as to obviously reduce the coal consumption of a power plant, and conform to the national industry policy of energy conservation and emission reduction.

Description

Technical field [0001] The invention proposes a method for reducing coal consumption and water recovery of coal-fired generating units by using coal drying exhaust steam, and relates to the technical fields of heat recovery and water recovery of coal drying tail gas and coal-fired power plants to save coal and reduce consumption. Background technique [0002] The addition of a raw coal pre-drying system using steam turbine extraction as the heat source to existing coal-fired power plants can significantly reduce coal consumption in power plants. Tianhua Chemical Machinery and Automation Research and Design Institute / National Drying Technology and Equipment Engineering Technology Research Center has successfully applied this technology In Shenhua Guohua Power Indonesia Muyin Coal Power Project 2×150MW power generation project. At present, the coal drying system of the existing power plant and the coal-fired generating unit operate independently. The dry tail gas generated during t...

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Problems solved by technology

At present, the coal drying system of the existing power plant and the coal-fired generating unit operate independently, and the dry tail gas generated during the coal drying process of the power plant is directly discharged into the atmosphere after dust removal (commonly used methods include bag dust removal, electric dust removal and wet dust removal), and the dry tail gas contains Large amounts of water vapor and heat are not recovered

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