Method of utilizing coal drying exhaust steam to reduce coal consumption of coal-fired power generator set and recovering water

A technology for generator set and coal drying, which is used in drying solid materials, drying, lighting and heating equipment, etc. It can solve the problem of unrecovered water vapor and heat from drying exhaust gas, and achieve the effect of completely controllable oxygen content.

Active Publication Date: 2014-08-06
TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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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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  • Method of utilizing coal drying exhaust steam to reduce coal consumption of coal-fired power generator set and recovering water

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, technical solution of the present invention is described in further detail again:

[0031] A method for reducing coal consumption and water recovery of a coal-fired power unit by using coal drying exhaust steam is to add a heat and water vapor recovery system between the coal drying system and the coal-fired power unit.

[0032] The dedusted dry tail gas (containing a large amount of water vapor, a small amount of non-condensable gas and a small amount of coal dust) from the coal drying system at 90-120 °C enters the absorption tower 1 (the conventional method is to directly discharge the atmosphere), and the circulating cooling water at 30-60 °C is supplied by The spray on the top of the absorption tower 1 and the dry tail gas conduct countercurrent direct contact heat exchange. A large amount of water vapor contained in the dry tail gas is carried by the gas through the absorption tower 1 and converted into hot water, whi...

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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 a coal-fired generating set by using coal drying and steam exhaust, and relates to the technical fields of heat recovery and water recovery of coal drying tail gas, and coal saving and consumption reduction in coal-fired power plants. Background technique [0002] Adding a raw coal pre-drying system with steam turbine extraction as the heat source to the existing coal-fired power plant can significantly reduce the coal consumption of the power plant. Tianhua Chemical Machinery and Automation Research and Design Institute / National Drying Technology and Equipment Engineering Technology Research Center has successfully applied this technology 2×150MW power generation project of Shenhua Guohua Power Indonesia Muyin Coal Power Project. At present, the coal drying system of the existing power plant and the coal-fired generating unit operate independently, and the dry tail g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B25/00
CPCY02P70/10
Inventor 赵旭申涛窦岩张麦奎令永功贾敏张岩谢晓玲
Owner TIANHUA INST OF CHEM MACHINERY & AUTOMATION
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