Crude benzene tubular furnace tail gas cleaning system and process

Abstract

The invention relates to the technical field of harmless treatment of crude benzene tubular furnace tail gas, in particular to a crude benzene tubular furnace tail gas cleaning system and process. Thesystem comprises a desulfurizing agent device, a dust removal and denitration integrated device and a chimney, wherein the crude benzene tube furnace is connected with the dust removal and denitration integrated device through a first flue gas pipeline, the desulfurizing agent device is connected with the first flue gas pipeline through a desulfurizing agent conveying pipeline, and a desulfurizing agent conveying fan is arranged on the desulfurizing agent conveying pipeline; the dust removal and denitration integrated device is connected with a chimney through a second flue gas pipeline, andan induced draft fan is arranged on the second flue gas pipeline. A process combining SDS dry desulfurization and SCR selective catalytic reduction denitration is adopted, so that through a desulfurization, denitration and dust removal integrated process, efficient desulfurization, denitration and particulate matter removal are achieved while the crude benzene tubular furnace tail gas is cleaned.The desulfurization and denitrification efficiency is high, the structure is simple, the system is integrated, and the desulfurization and denitrification efficiency is high.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of crude benzene tube furnace tail gas, in particular to a crude benzene tube furnace tail gas cleaning system and process. Background technique [0002] Since 2012, when the state promulgated the "Emission Standards for Pollutants in the Coking Chemical Industry" (GB16171-2012) (hereinafter referred to as "Emission Standards"), various localities have successively proposed regulations based on the emission of COG in the combustion section such as crude benzene tube furnace Higher environmental protection requirements for "emission standards", taking Tangshan area as an example, it is clearly stipulated in the "Tang Huanqi (2018) No. 4" document: SO in the tail gas of the combustion COG section 2 The emission concentration limit is 15mg / Nm 3 , NO x The emission concentration limit is 100mg / Nm 3 , the particle emission concentration limit is 10mg / Nm 3 , in order to meet more stringen...

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Problems solved by technology

[0008] The treatment process of nitrogen oxides in the electric power, cement, glass and other industries is quite mature, but the temperature of the crude benzene tube furnace exhaust gas discharged from the coking plant is relatively low, the exhaust gas volume is small, and the NO x , SO 2 The concentration is relatively low. If the traditional denitrification process is adopted, it will inevitably be restricted by factors such as low exhaust gas temperature and high initial investment and operation costs, and cannot meet the requirements of emission standards.

[0009] According to the investigation of the existing technology, it is found that when the crude benzene tube furnace and the coke oven chimney are arranged on one side, and the distance is relatively close, and the pipeline is easy to install, the tail gas of the crude benzene tube furnace is merged into the coke oven flue gas, and concentrated The desulfurization and denitrification cleaning treatment can make the exhaust gas of the crude benzene tube furnace meet the standard discharge; however, when the crude benzene tube furnace and the coke oven chimney are separated on both sides of the coke oven, or the crude benzene tube furnace tail gas cannot be smoothly combined due to site and pipeline restrictions. When entering the coke oven flue gas desulfurization and denitrification system, the crude benzene tube furnace tail gas will face the difficulty of processing and the plight of substandard emissions, which will affect the environmental protection emission and use of the entire gas purification system and even the entire coke oven system

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