Device for recycling waste heat of flue gas in power station boiler

Abstract

The invention provides a device for recycling waste heat of flue gas in a power station boiler, which is characterized in that one end of a water inlet pipe of a heat exchanger is communicated on a pipeline between a gland heater and a low pressure heater; the other end of the water inlet pipe is communicated with a coil in the heat exchanger; the other end of the coil is connected with a deaerator through a water return pipe of the heat exchanger; the deaerator is connected with the low pressure heater through the pipeline; a clean water return pipe is arranged at the bottom of the heat exchanger; a nozzle is arranged at the upper part of the heat exchanger and is communicated with one end of a clean water pipe; the other end of the clean water pipe is connected with a water collecting tank or a desulfurizer storing pot; one end of a flue pipe is connected with an electrostatic dust collector through a draught fan; and the other end of the flue pipe is communicated with a chimney or a desulfurizing tower through the heat exchanger. The device for recycling waste heat can recycle most of heat in the flue gas discharged from the boiler and can convert the recycled heat into the heat of the condensation water of a steam turbine, thereby reducing the steam consumption of the low pressure heater in a heat regenerative system of the steam turbine and saving a large amount of energy sources. A cleaning device is arranged in the heat exchanger, thereby ensuring the cleanness and the heat exchange efficiency of a heat exchange surface.

Description

technical field [0001] The invention provides a boiler flue gas waste heat utilization device. Background technique [0002] At present, the exhaust smoke of power plant boilers is sucked by the boiler induced fan, enters the electrostatic precipitator for dust removal treatment, removes most of the coal ash in the flue gas, and then is transported to the chimney exhaust or desulfurization device for desulfurization treatment through the boiler induced fan. This process only removes dust and desulfurizes the flue gas, and does not utilize the heat of the flue gas. Generally, the exhaust gas temperature of power plant boilers is between 110°C and 130°C. The exhaust gas loss of the entire boiler accounts for about 5% to 10% of the boiler efficiency. A large amount of heat in the flue gas is wasted without being used. Contents of the invention [0003] The problem to be solved by the present invention is to provide a utility boiler flue gas waste heat utilization device to f...

AI Technical Summary

Problems solved by technology

Generally, the exhaust gas temperature of power plant boilers is between 110°C and 130°C, and the exhaust gas loss of the entire boiler accounts for about 5% to 10% of the boiler efficiency. A large amount of heat in the flue gas is wasted without being used.

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