Boiler flue gas waste heat high-efficiency system and design method thereof

Abstract

The invention relates to a boiler flue gas waste heat high-efficiency system and a use method thereof, the boiler flue gas waste heat high-efficiency system is used for recycling boiler flue gas waste heat, so that the turbulivity is enhanced and heat exchange is enhanced when flue gas and air flow, and the high-efficiency system comprises a fuel preparation system, a high-efficiency air preheater, a boiler, an air feeder, a post-processing system, an induced draft fan and a chimney; wherein the air feeder is connected to the left side of the high-efficiency air preheater through an air inlet pipeline, and the right side of the high-efficiency air preheater is connected to the fuel preparation system through an air outlet pipeline; the fuel preparation system supplies heat to the boiler; the boiler is provided with a high-temperature flue gas pipeline which is connected to the top of the high-efficiency air preheater, the bottom of the high-efficiency air preheater is provided with a low-temperature flue gas pipeline which is connected to the post-treatment system, the post-treatment system sucks flue gas to a chimney through an induced draft fan, and the chimney discharges the flue gas to the external environment. The high-efficiency system can make full use of flue gas waste heat, the energy utilization rate is high, the high-efficiency air preheater in the system is compact in structure, a turbulence channel is arranged in the high-efficiency air preheater, the turbulence degree is enhanced, and the heat exchange effect is good.

Description

technical field [0001] The present invention is in the technical field of high-efficiency recovery and energy-saving equipment for waste heat of boiler flue gas in a coal-fired power station. Background technique [0002] At present, the high-efficiency air preheaters used in the waste heat recovery of flue gas from coal-fired power station boilers are mainly rotary, tubular and finned-tube types. Although the rotary high-efficiency air preheater is suitable for large air volume conditions, its structure is complex and the process requirements are high. At the same time, the flue gas and air are mixed during operation, and the air leakage rate is high; tubular and finned tubes Due to its large size, the type heat exchanger occupies a lot of space, and at the same time, it has problems such as low heat exchange efficiency, easy accumulation of dust and difficult to handle after accumulation, and large wear of the heat exchange tube at the inlet of the flue gas. [0003] The ...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the disadvantages of the current coal-fired power plant boiler flue gas waste heat recovery efficiency is low, the heat transfer capacity of the high-efficiency air preheater is poor, easy to accumulate ash and difficult to clean ash, etc., and overcome the traditional plate heat exchanger plate processing In the process, it is necessary to process the mold first and then press the plate with a hydraulic press, resulting in long processing cycle and high cost, so as to provide a high-efficiency boiler flue gas waste heat system and its use method to achieve the purpose of efficient use of flue gas waste heat

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