Ultra-clean emission system for cooperatively treating VOCs-containing waste gas and coke oven flue gas

Abstract

The invention relates to an ultra-clean emission system for cooperatively treating VOCs-containing waste gas and coke oven flue gas. The ultra-clean emission system comprises a combustion device, a cooling device, a desulfurization device, a dust removal device, a heating device, a denitration device and an emission device which are connected in sequence, wherein the combustion device is used for carrying out combustion treatment on the VOCs-containing waste gas; the cooling device is used for cooling the combusted waste gas; the desulfurization device is used for carrying out desulfurization treatment on mixed gas of the coke oven flue gas and the cooled waste gas; the dust removal device is used for carrying out dust removal treatment on the desulfurized gas; the heating device is used for heating the dedusted gas; the denitration device is used for carrying out denitration treatment on the heated gas; and the emission device is used for discharging the denitrated gas into the atmosphere. The system can be used for cooperatively treating VOCs-containing waste gas and coke oven flue gas, has the characteristic of simultaneously treating VOCs, sulfur dioxide and nitric oxide, can enable the treated flue gas to reach the ultra-clean emission standard, and is simple in process flow, stable in operation and relatively low in cost.

Description

technical field [0001] The invention relates to the technical field of purification treatment of VOCs-containing waste gas and flue gas in the iron and steel industry, in particular to an ultra-clean emission system for co-processing VOCs-containing waste gas and coke oven flue gas. Background technique [0002] In the context of my country's continuous upgrading of environmental protection measures, the standards for flue gas emissions in the traditional steel industry are becoming increasingly stringent. Among them, the desulfurization and dust removal systems are quite mature, and the treatment of volatile organic compounds (VOCs) Denitrification is still in the development stage; the VOCs in the flue gas emitted from the coking process of iron and steel plants are one of the important sources of atmospheric VOCs. Most of the VOCs are not only toxic but also carcinogenic. In addition, VOCs can also cause photochemical smog, damage the ozone layer, cause Leukemia and other h...

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Problems solved by technology

[0003] At present, coke oven flue gas and VOCs-containing waste gas in the iron and steel industry are usually treated separately. In the prior art, there is a combined flue gas treatment system with activated carbon method flue gas purification technology and low-temperature denitrification (publication number is CN209333456U), which is absorbed by activated carbon. System and low-temperature SCR denitrification to remove sulfur dioxide and nitrogen oxides in flue gas at the same time. Although the system basically does not consume water resources and has no secondary pollution during operation, the low-temperature SCR denitrification system currently has immature technology. Unstable operating efficiency and other shortcomings,

[0004] There is also a VOCs-containing exhaust gas treatment system (public number 207928940U), which removes some impurities such as naphthalene, tar, and benzene in the exhaust gas through the VOCs purification system, and then sends it to a gas-fired boiler for combustion to achieve the purpose of purification. Reuse can improve the utilization rate of resources to a certain extent, but the system only treats one kind of VOCs waste gas, and the sulfur dioxide and other substances produced by gas boilers need secondary treatment to meet the emission requirements

[0005] In the existing technology, for the treatment of VOCs waste gas and coke oven flue gas produced by coking plants, there are shortcomings such as single treatment medium, high investment cost, secondary pollution, and high energy consumption. It is urgent to develop a technical procedure with simple procedures , No secondary pollution, low energy consumption co-processing coking plant VOCs and ultra-clean flue gas emission technology

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