Coke oven flue gas waste heat and desulfurization and denitration dedusting system

Abstract

The invention discloses a coke oven flue gas waste heat and desulfurization and denitration dedusting system. The system comprises a waste heat recovery subsystem, a dry desulfurization subsystem, a dedusting subsystem, an ammonia water treatment subsystem, an SCR denitration subsystem and a chimney. A flue gas inlet end of the waste heat recovery subsystem is communicated with a coke oven main flue, a flue gas outlet end of the waste heat recovery subsystem is connected to a flue gas inlet end of the dry desulfurization subsystem, a flue gas outlet end of the dry desulfurization subsystem is communicated with a flue gas outlet end of the dedusting subsystem, an input end of the SCR denitration subsystem is communicated with an output end of the ammonia water treatment subsystem, and a flue gas outlet end of the SCR denitration subsystem is communicated with the chimney. The system provided by the invention performs waste heat recovery, desulfurization, dedusting and denitration treatment on coke oven flue gas, enables coke oven flue gas to reach the emission standard requirements, and has the characteristics of excellent economic performance and good environmental protection effect.

Description

technical field [0001] The invention relates to the technical field of energy saving and environmental protection in the metallurgical industry, in particular to a coke oven flue gas treatment system. Background technique [0002] my country is a large country of coke production. In the process of coking and producing coke, it is necessary to burn mixed gas or coke oven gas to indirectly heat the coal. When burning mixed gas or coke oven gas, coke oven smoke will inevitably be produced. Furnace flue gas is a kind of polluting gas, which contains a large amount of sulfur dioxide, nitrogen oxides and soot. With the increasingly stringent national environmental protection standards and the special requirements for pollution discharge in key domestic areas, the flue gas treatment of coke ovens has become very urgent. [0003] Coke oven flue gas has the following characteristics. 1) Flue gas temperature: The temperature of coke oven flue gas is generally around 240°C, which has ...

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Problems solved by technology

Among them, SO 2 The concentration is not high, not suitable for regenerative desulfurization process, NO x The concentration is high, and it is necessary to use a high-efficiency SCR process for denitrification treatment. In addition, the coke oven flue gas also contains tar and other substances, and the composition is relatively complex

[0004] In view of the above coke oven gas characteristics, the most widely used combination of high temperature denitrification and wet desulfurization in other industries can no longer meet the technical and economic requirements of coke oven gas treatment

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