Three-dimensional internal and external finned tube integrated air preheater and processing method thereof

Abstract

The invention discloses a three-dimensional internal and external finned tube integrated air preheater and a smoke processing method thereof. The three-dimensional internal and external finned tube integrated air preheater comprises a vertical case, the upper end and the lower end of the case are provided with flue ports including an flue inlet and a flue outlet respectively; the inside of the case close to the flue ports is provided with tube plates to close the case and separate the inside and the flue ports; a plurality of three-dimensional internal and external finned tubes are welded to the tube plates at the upper end and the lower end in an expanded mode and fixed inside the case; the orifices of the three-dimensional internal and external finned tubes are arranged inside the flue ports; one side of the case is provided with an air inlet, and the other side of the case is provided with an air outlet. The three-dimensional internal and external finned tube integrated air preheater integrates an air preheater and a GGH (gas-gas heater) into a whole, thereby reducing equipment investment, saving equipment space, achieving integration and solving the problems of low heat exchange efficiency, heat transfer surface acid corrosion, scale formation, clogging and the like of existing devices. Most of preheated high-temperature air is applied to combustion of a boiler, the other part of the high-temperature air is mixed with purified flue gas flowing out of a desulfurizing tower, and the temperature of the mixed purified flue gas can be up to environment protecting emission standard.

Description

technical field [0001] The invention relates to an air preheater used for boiler heat exchange in a power plant, in particular to an air preheater integrating three-dimensional inner and outer rib tubes. Background technique [0002] Power plant boiler flue gas process, denitrification → air preheater → electric bag filter → booster fan → gas-gas heat exchanger (GGH for short) → desulfurization tower → GGH → chimney, the air preheater in the process generally adopts a spiral groove Tube air preheater, bare tube air preheater, hot pipe air preheater or rotary air preheater. The air preheater raises the air temperature from 20°C to 240~300°C, and the flue gas temperature drops from 290~350°C to 140~150°C. In the flue gas process, the GGH heat exchange equipment cools the original flue gas and enters the desulfurization tower for desulfurization. The desulfurized flue gas is called clean flue gas, and then the obtained clean flue gas is sent to the GGH for heating. The air pr...

AI Technical Summary

Problems solved by technology

The air preheater and GGH used in it have the following problems: the heat transfer coefficient is low, the heat exchange surface in the low temperature section has acid corrosion, scaling and ash plugging, and occupies a large area and takes up a lot of space

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