A double heating surface dilution air air heater for a coal-fired power generating unit denitration system

Abstract

The utility model relates to a double heating surface dilution air warm air blower of coal-fired generating set denitration system, by cold dilution air main pipe, steam heating unit, wind / smoke heating unit, hot dilution air main pipe and three -way direction control valve constitute, steam heating unit includes cold dilution air pipe, hot dilution air pipe and heat exchanger, wind / smoke heating unit includes cold dilution air pipe, hot dilution air pipe, wind / smoke heat exchange pipe and wind / smoke flow space, and the import of wind / smoke heat exchange pipe is connected with cold dilution air pipe, and the export of wind / smoke heat exchange pipe is connected with hot dilution air pipe, and cold dilution air main pipe is connected through three -way direction control valve between two cold dilution air pipes. The utility model utilizes the high temperature wind / smoke with interference heat of coal-fired generating set to heat dilution air, to replace the auxiliary steam heating during the normal operation of unit, can greatly reduce the use amount of auxiliary steam, reduce production cost, and also has the positive role to environmental protection.

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