Heat storage type converter waste heat recovery method and device

Abstract

The invention provides a heat storage type converter waste heat recovery method and device. During a steel-making period of a converter, flue gas is preliminarily cooled through a flue and passes an overheating chamber and a waste heat furnace in turn for waste heat recovery step by step, and an overheating steam product is generated. The cooled flue gas enters a coal gas collection chamber through a deduster and is recovered. At this time, heat storage materials in a vaporized flue, a heat exchange tube set, the waste heat furnace and the deduster store heat. During a non-steel-making period, the heat storage materials in the waste heat furnace and the heat exchange tube set continue to release heat and generate steam so as to realize continuous supply. At the same time, because the heat storage materials release heat, the temperature of each device won't greatly decrease, the device is prevented from fatigue failure due to frequent large temperature difference, and the safety is increased and the service life is prolonged. The heat storage type converter waste heat recovery method and device solve the problems of low waste heat utilization, large energy consumption and high operation cost in a converter waste heat recovery system at present, prolong the service life of each device while meeting the waste heat gradient utilization of the converter, improve the heat energy utilization rate, reduce the operation and maintenance cost, and are suitable for large-scale popularization and usage.

Description

technical field [0001] The invention relates to recovery of waste heat from converter flue gas in the metallurgical industry and prolonging the service life of equipment, in particular to a method and device for recovery of waste heat from a heat storage type converter. Background technique [0002] A large amount of high-temperature flue gas will be produced in the process of converter steelmaking, the temperature of the flue gas outlet is about 1400-1600 °C, and the dust concentration is 70-200g / m 3 , After leaving the furnace mouth, it needs to cool down before entering the flue gas dust removal system. The dust removal methods can be roughly divided into wet dust removal (OG method) or dry dust removal (LT method). The main principle of the OG method is that the converter flue gas is cooled to 900-1000 ° C by the vaporization cooling flue, and then enters the two-stage venturi tube, and is cleaned and purified by steps such as washing and gravity dehydration; the main pr...

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Problems solved by technology

[0005] The purpose of the present invention is to address the above problems, to provide a heat storage type converter waste heat recovery method and device to solve the current problems of low converter waste heat utilization rate and high cost, and can be used for renewable energy and other industrial process waste heat. use

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