System for desulfurizing and denitrating active coke flue gas, and process method

Abstract

The invention discloses a system for desulfurizing and denitrating active coke flue gas, and a process method. The system comprises an adsorption reactor, a desorption regenerator, a material conveying device and a byproduct conversion device, wherein the devices are connected by specific pipelines and functions of the devices are realized by using a specific process method; the adsorption reactor is a composite layer double-section cross flow moving bed and consists of a denitration section and a desulfurization section, so that SO2, NOx, dioxin, mercury and smoke dust in flue gas are purified in an integrated mode; the desorption regenerator is divided into a preheating area, a regeneration area and a cooling area, so that active coke on which the mercury, and the dioxin are enriched are extracted, and subsequent harmless treatment of the active coke is realized; the desorption regenerator performs heat exchange by a heater and circulates heat energy for recovering, and the byproduct conversion device is used for performing sulphur recycling on desorption regenerated gas generated in the regeneration process; and by the process method, the integrated purification of the flue gas and the harmless treatment of the active coke can be realized.

Description

technical field [0001] The present invention belongs to the flue gas desulfurization, denitrification, dioxin and mercury removal and dust removal integrated flue gas (waste) gas purification technology in the fields of coal-fired thermal power, smelting and sintering machines, coal-fired boilers, non-ferrous metallurgy and chemical building materials, specifically The invention relates to a system and a process method for desulfurization and denitrification of activated coke flue gas. Background technique [0002] With the rapid development of my country's industrialization and economic construction, a large amount of SO is emitted into the atmosphere every year. 2 and NO x , causing severe acid rain hazards. As of 2010, the annual SO emissions into the atmosphere 2 More than 20 million tons, beyond the self-purification capacity of the atmosphere. The NOx emitted into the atmosphere is increasing year by year, and the acid rain in our country has gradually changed from...

AI Technical Summary

Problems solved by technology

Some units in Japan and Germany abroad have developed a combined desulfurization and denitrification adsorption reactor, desorption regenerator and process method. Cross-flow moving bed is an adsorption reactor widely used in a combined desulfurization and denitrification process method, patent CN 101274193B A radial moving bed used for flue gas purification is disclosed. The performance of the multi-unit parallel combination of the announced radial moving bed with a circular cross-section is relatively poor; the patent JP8103668 discloses an active coke desulfurization and denitrification catalyst and corresponding The desulfurization and denitrification device diagram of the published device has no obvious double-stage structure and internal structure and no layering; therefore, the effect of desulfurization and denitrification is not obvious; patent JP62171737 has announced a process flow for desulfurization and denitrification of activated coke, but the desulfurization tower and The denitrification tower is arranged separately

[0007] In summary, the existing combined desulfurization and denitrification adsorption reactor, desorption regenerator and process method have low structural efficiency, high energy consumption, complicated process, insufficient gas-solid contact, poor heat transfer performance in the bed, and easy hot spots. Formation, integration of low purification performance, poor stability in adapting to working conditions, etc., it is necessary to develop new activated coke flue gas desulfurization and denitrification and process flow and new structure of adsorption reactor and desorption regenerator to realize activated coke flue gas Innovation of desulfurization and denitrification system and process method

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