Comprehensive utilization system for drying low-order coal of thermal power plant in steam pumping and indirect heat exchanging way and process thereof

A low-rank coal, thermal drying technology, applied in the direction of drying gas arrangement, drying, drying machine, etc., can solve the problems of no actual deployment, and achieve the effects of saving energy consumption, improving boiler efficiency, and reducing coal consumption for power generation
CN101852540AActive Publication Date: 2010-10-06SHANDONG TIANLI DRYING TECH & EQUIP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG TIANLI DRYING TECH & EQUIP
Publication Date
2010-10-06

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Abstract

The invention relates to a comprehensive utilization system for drying low-order coal of a thermal power plant in a steam pumping and indirect heat exchanging way and a process thereof. The system comprises an indirect-heat-exchange low-order coal predrying device using a steam pipeline of a boiler or a steam turbine of the thermal power plant as a heat source, wherein tail steam obtained by the drying low-order coal of the device is connected with a secondary steam heat insulating and washing device; the secondary steam heat insulating and washing device is connected with a secondary steam recycling device; and the secondary steam recycling device is connected with a dust-containing waste water purifying and utilizing device. In the invention, the steam pumped by the boiler or the steam turbine is used as the drying heat source, high-moisture low-order coal (brown coal) is dewatered and dried through an indirect-heat-exchange drier, and secondary steam generated by dewatering the low-order coal (brown coal) is butt jointed with a steam-water system of the power plant, thereby the operating condition of the boiler is improved, the CO2 emission and fuel consumption are obviously reduced, the loss of a coal mill and matched systems is reduced, the generating efficiency of the power plant is improved, and the blank of the drying and the comprehensive utilization of the low-order coal (brown coal) of the thermal power plant in China is filled.
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Description

technical field

[0001] The invention relates to a comprehensive utilization system and a process for drying low-rank coal by steam extraction in a thermal power plant through indirect heat exchange. Background technique

[0002] At present, domestic coal-fired thermal power plants have not actually started the industrial application of low-rank coal (lignite) drying, and for the existing low-rank coal (lignite) power plants using pulverized coal boilers, the current domestic industrial scale low-rank coal (lignite) ) drying and dehydration technology is blank. Contents of the invention

[0003] The purpose of the present invention is to solve the above problems, to provide a comprehensive utilization system and process for thermal power plant pumping steam indirect heat exchange drying low-rank coal, which uses the steam extracted from the boiler or steam turbine as a drying heat source to dry the high-moisture low-rank coal (Lignite) is dehydrated and dried through an in...

Claims

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