Waste gas recycling treatment method

Abstract

The invention discloses a waste gas recycling treatment method. The waste gas recycling treatment method involves a waste gas pressurization unit, a dehydration unit, a sulfur dioxide removal unit, a carbon dioxide removal unit and a refrigeration unit, and the waste gas pressurization unit, the dehydration unit, the sulfur dioxide removal unit, the carbon dioxide removal unit and the refrigeration unit are sequentially connected. Compared with a traditional desulfuration and decarburization technology, the waste gas recycling treatment method has the advantages that firstly, waste gas is treated and recycled, high-purity sulfur dioxide and carbon dioxide products with high added values are obtained, no waste water is generated, an environmental protection project is no longer the burden of enterprises, and an industrial device with both environmental protection benefits and economic benefits is provided; secondly, near-zero emission of sulfur dioxide is achieved, carbon dioxide capture is also achieved, and a more economical carbon emission reduction technology is provided; and thirdly, the refrigerant of the refrigeration unit can be carbon dioxide, and the carbon dioxide is self-produced in the device and is also a green refrigerant.

Description

technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a waste gas resource treatment method. Background technique [0002] The flue gas contains sulfur dioxide, the main component of air pollution. Sulfur dioxide will seriously pollute the atmospheric environment, destroy the ecological balance, endanger the health of humans, animals and plants, cause large areas of acid rain, corrode and destroy buildings, and endanger the living environment of human beings and the ecological environment. huge. There are many ways to remove sulfur dioxide, which can be divided into three categories: wet method, dry method and semi-dry method according to the dry and wet form of desulfurization agent and desulfurization product. Wet sulfur dioxide removal mainly adopts alkaline absorbent method, mainly including limestone / lime method, magnesium method, seawater method, double alkali method, ammonia method, etc. Different alkaline absorb...

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Problems solved by technology

All these methods are trying their best to reduce sulfur emissions, but they cannot achieve zero sulfur emissions, and produce secondary pollution while desulfurization, gas-phase sulfur emissions meet the national emission standards, and the produced sulfate or solvent degradation products are a new waste

At the same time, the flue gas also contains a large amount of carbon dioxide. Carbon dioxide is a greenhouse gas, which mainly comes from flue gas. As the main greenhouse gas, the issue of carbon dioxide emission reduction has attracted widespread attention worldwide. There are many ways to remove carbon dioxide, including physical absorption. , chemical absorption method and physical and chemical absorption method, etc. At present, the traditional desulfurization and decarbonization methods have large investment and high operating costs, and most of the carbon dioxide in the flue gas is not recycled, and is directly discharged after desulfurization. For enterprises that emit waste gas In other words, exhaust gas treatment is a big burden

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