Integrated device and process for carrying out desulfurization, dust removal and modification on coal-pyrolyzed gas

Abstract

The invention discloses an integrated device and process for carrying out desulfurization, dust removal and modification on coal-pyrolyzed gas. Raw coke oven gas from a medium and low-temperature coal dry-distillation furnace or a coke oven directly enters an integrated moving bed purifier, and the desulfurization, dust removal and modification processes are implemented without reducing the temperature by utilizing the physical sensible heat taken by the gas so as to obtain clean and high-quality coal tar and gas. The integrated moving bed purifier is divided into three parts, including a desulfurization region, a primary catalytic region and a secondary catalytic region which are sequentially filled with a desulfurizing agent, a natural ore type tar cracking catalyst and an artificial tar cracking catalyst; when dust in the gas passes through a particle bed which is in a stacked state, the aim of dust purification can be reached by impact, sedimentation, interception and the like. All the desulfurizing agent and catalysts can be regenerated and recycled in place. The device and the process disclosed by the invention can be used for implementing the desulfurization, dust removal and modification in one step, are beneficial to simplification of the subsequent process of a coal thermal process, and have the advantages of increasing the added value of pyrolysis products and reducing the environmental pollution.

Description

technical field [0001] The present invention relates to a coal pyrolysis gas treatment device and process, in particular to an integrated device and process for desulfurization, dust removal and upgrading of coal pyrolysis gas (especially medium and low temperature dry distillation gas or raw coke oven gas) . Background technique [0002] Medium and low temperature dry distillation usually refers to the process of coal being heated at 500-800 ° C, isolated from air, and thermally decomposed to produce semi-coke, coal tar, and gas. The temperature of high-temperature dry distillation (coking) is above 900°C, and its products are coke, high-temperature coal tar and gas. While the above two processes provide high-quality fuels and chemicals for the society, they also bring serious pollution to the environment. In particular, coking is an intermittent production process, and the subsequent processing of tar consumes a lot of energy, the process is complicated, and the dust poll...

AI Technical Summary

Problems solved by technology

While the above two processes provide high-quality fuels and chemicals for the society, they also bring serious pollution to the environment. In particular, coking is an intermittent production process, and the subsequent processing of tar consumes a lot of energy, the process is complicated, and the dust pollution is serious. Prominent problems such as low product quality

The traditional gas treatment process is to directly cool the gas to obtain dusty coal tar, and then reheat the coal tar for processing, which not only consumes a lot of energy, but also pollutes waste water and residue during the cooling process; or sprays the raw gas with ammonia water to cool down and remove dust. As a result, the dust content in the tar is very high, and it brings waste water and waste residue pollution, and at the same time wastes the physical sensible heat of the gas

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