Optimized indirect catalytic combustion flue gas multistage heat exchange system and process

Abstract

The invention discloses an optimized indirect catalytic combustion flue gas multistage heat exchange system and process. The system comprises a catalyst bed, a natural gas combustor, a heat exchanger,an adsorption rotating wheel, an adsorption fan, a smoke exhaust fan and a desorption fan, wherein the heat exchanger is provided with four stages of heat exchange units according to a low and high-temperature level matching principle; the adsorption rotating wheel comprises an adsorption region, a purging region and a desorption region; another natural gas inlet and a combustor are arranged outside the catalyst bed; a pipeline of natural gas flue gas produced by combustion is communicated with a catalytic combustion waste gas pipeline to form a heat-side medium pipeline; after the natural gas flue gas and catalytic combustion flue gas are mixed, mixed gas enters the heat exchanger; concentrated waste gas and desorbed gas are respectively heated by the internal four stages of heat exchange units; after heat is recycled, the gas is discharged into a chimney. By use of a fine design of internal heat transfer units, a heat exchange process of fluid in the heat exchanger is optimized, andminimization of a heat exchange area is realized; and meanwhile, the life of a catalyst can be prolonged, and the system purification efficiency is improved.

Description

technical field [0001] The invention relates to an optimized indirect catalytic combustion flue gas multi-stage heat exchange system and process, which is especially suitable for the catalytic combustion process of low-concentration organic waste gas. Background technique [0002] With the continuous development and progress of the human industrial economy, the environmental problems caused by various waste gases generated in the industrial production process are increasing. Therefore, how to control industrial waste gas has become a problem that must be paid attention to in modern industrial production. Common treatment methods for industrial organic waste gas include thermal incineration, regenerative thermal incineration and catalytic incineration. Among them, catalytic incineration has been widely used because of its low light-off temperature, high treatment efficiency, and low energy consumption. [0003] An important step in the catalytic incineration system process i...

AI Technical Summary

Problems solved by technology

Firstly, the sulfur dioxide contained in the combustion of high-sulfur industrial natural gas will react with the metal ions in the catalyst, leading to a certain degree of poisoning of the catalyst and reducing the life of the catalyst; secondly, some studies have shown that the water vapor contained in natural gas flue gas will react with toluene Other organic components produce competitive adsorption, which affects the catalyst activity; in addition, the additional natural gas flue gas added increases the system's processing gas volume and increases the system load.

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