Liquid phase flue gas desulfurizing and denitrifying purification method and apparatus

Abstract

The invention relates to a liquid-phase smoke desulfuration denitration purifying method and relative device, belonging to the smoke purifying technique. It can effectively remove sulfur dioxide and nitrogen oxide of smoke. It utilizes ejection bubbling method to adsorb the sulfur dioxide and nitrogen oxide of smoke, while the adsorption solution is the sodium chlorite solution in 0.001MOL / L-0.100MOL / or the additive in 0.001MOL / L-0.005MOL / L, and the pH valve of adsorption solution is 3-11; the additive is one or the combination of calcium hypochlorite, baking soda, hydrogen dioxide solution, acid sodium phosphate, or calcium hydrate. The removing efficiency of sulfur dioxide in said invention is above 99%; the removing efficiency of nitrogen oxide is above 90%; and the utilization of adsorption solution is above 97%. Therefore, said invention has the advantages that high removing efficiency, lower cost, simple device, high utilization of adsorption solution and wider application for large, middle, and small boiler, etc.

Description

technical field [0001] The invention relates to a method and device for purifying flue gas, in particular to purifying flue gas by using a jet bubbler, and belongs to the technical field of flue gas purification. Background technique [0002] In recent years, with the rapid development of industry, the problem of environmental pollution has become more and more prominent. For example, harmful gases such as sulfur dioxide and nitrogen oxides in the combustion waste gas of petroleum and coal are discharged into the atmosphere, causing serious pollution of the atmospheric environment. According to relevant information, China's annual economic losses caused by acid rain pollution caused by sulfur dioxide and nitrogen oxides to the ecological environment and human health are about 110 billion yuan. Therefore, the country is increasingly strengthening the control and governance of harmful gas pollution such as sulfur dioxide and nitrogen oxides. There are many reports on flue gas...

AI Technical Summary

Problems solved by technology

The advantages of calcium desulfurization are high removal efficiency and high utilization rate of desulfurizer, but there are also problems such as easy fouling and blockage of equipment, which will cause the system to fail to operate.

For denitrification technology, the catalytic reduction method in the dry method is the most researched, but the reduction method is used to remove NO X , not only cannot recover nitrogen resources, but also consume a large amount of reducing agent, resulting in waste of resources

At the same time SO 2 The coexistence of NO can easily poison the NO catalyst, which is a difficult problem that has not been solved in the world for many years

However, the currently developed oxidation denitrification method generally has problems such as the use of oxidants is expensive, and even some gas oxidants used have potential safety hazards during equipment operation.

In addition, the existing flue gas desulfurization and denitrification technologies are all graded treatment methods. The graded treatment not only occupies a large area, the system is complex, and the equipment investment and operation and maintenance costs are high.

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