Method for recycling heat and water of steam evaporated during drying of fuel coal in power plant

Abstract

The invention discloses a technique for recycling heat and water of steam evaporated during the drying of fuel coal in a power plant, wherein the technique is combined by two conventional techniques, namely a fuel coal power generator set and a coal drying evaporated steam wet-method dust extraction system; particularly, on the basis of the conventional fuel coal power generator set and the coal drying evaporated steam wet-method dust extraction system, a heat exchanger is additionally arranged between a condenser and a heater I of the fuel coal power generator set and is used for energy exchanging utilization; the method is energy-saving and consumption-reducing; and steam evaporated from coal is recycled.

Description

technical field [0001] The invention relates to a method for coal-fired drying and evaporation water vapor heat and water recovery in a power plant. Background technique [0002] In the existing coal-fired generating units, the 20-40°C water condensed by the condenser needs to be heated step by step, boosted and then enters the coal-fired boiler for recycling. The step-by-step steam extraction is characterized by a large amount of steam extraction and a large amount of heat supplement. [0003] The existing coal drying and evaporating water vapor wet dust removal method is to use a wet dust collector to use the water vapor evaporated from coal powder (generally containing a small amount of non-condensable gas and a small amount of coal dust) and use 20-40°C water to indirect heat exchange to 90 Water vapor at ~150°C is condensed and evacuated directly after dust removal. The feature is that water vapor can be recovered, but the flow of water at 20-40°C that requires heat ex...

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Problems solved by technology

[0003] The existing coal drying and evaporating water vapor wet dust removal method is to use a wet dust collector to use the water vapor evaporated from coal powder (generally containing a small amount of non-condensable gas and a small amount of coal dust) and use 20-40°C water to indirect heat exchange to 90 Water vapor at ~150°C is condensed and evacuated directly after dust removal. The feature is that water vapor can be recovered, but the flow of water at 20-40°C that requires heat exchange is large, and the water at 60-120°C is directly discharged after heat exchange, resulting in heat loss.

[0004] Disadvantages: The existing coal-fired generator set and the coal drying and evaporating water vapor wet dedusting system operate independently, the energy consumption is high, and the energy is not comprehensively utilized

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