System and method for performing desulfurization, denitration and demercuration to flue gas simultaneously

Abstract

The invention relates to a system and a method for performing desulfurization, denitration and demercuration to flue gas simultaneously. The system comprises a flue gas generation device, a dust remover and an absorption tower, wherein the dust remover is connected with the flue gas generation device through a flue; the absorption tower is connected with the dust remover through the flue; the top of the absorption tower is connected with a chimney; the bottom of the absorption tower is connected with an oxidation air blower and a filter; the filter is connected with a separator; the separator is connected with a salt solution concentration crystallization device; a finished product packaging device is connected to the salt solution concentration crystallization device; an oxidation flue is arranged on the flue where the dust remover is connected with the absorption tower; and a strong oxidation system is connected to the oxidation flue so as to provide a strong oxidant. According to the system and the method, the desulfurization rate of flue gas produced by major industries can reach above 95%, the denitration rate can reach above 85%, and the demercuration rate can reach above 90%; and the set of the system is low in investment cost and energy consumption, convenient to use, suitable for flue gas desulfurization, denitration and demercuration treatment in various fields, so that other single desulfurization, denitration or demercuration systems cannot be compared with the system.

Description

technical field [0001] The invention relates to a system and method for simultaneous desulfurization, denitrification and mercury removal of flue gas. Background technique [0002] Nitrogen oxides and sulfur oxides produced during the utilization of coal, natural gas, and heavy oil, as well as some chemical production, have caused serious harm to the atmospheric environment. At present, there are several types of desulfurization technologies generally adopted for air pollution control, such as dry method, semi-dry method and wet method. Dry and semi-dry methods have the disadvantage of low desulfurization efficiency. The traditional wet desulfurization process generally uses acid-base neutralization reaction first, and then oxidizes the neutralized product. Therefore, these desulfurization methods have problems such as difficult oxidation and incomplete oxidation; complex by-product components, such as limestone gypsum desulfurization, Ammonia desulfurization, etc. And th...

AI Technical Summary

Problems solved by technology

The dry method and semi-dry method have the disadvantage of low desulfurization efficiency

The traditional wet desulfurization process generally uses acid-base neutralization reaction first, and then oxidizes the neutralized product. Therefore, these desulfurization methods have problems such as difficult oxidation and incomplete oxidation; complex by-product components, such as limestone gypsum desulfurization, Ammonia desulfurization, etc.

And the traditional desulfurization method does not have the denitrification ability

[0003] There are two main types of nitrogen oxide removal methods: one is to control the production of nitrogen oxides through the combustion process, and the efficiency is about 30-50%. This method has low denitrification efficiency and is easy to cause slagging in the furnace pipeline

The second type of flue gas denitrification technology is the selective catalytic reduction technology SCR widely used in Europe, America, Japan and other countries. The denitrification efficiency is generally 80%. The denitrification device of this method is set in the high temperature section, and there is a lot of dust in the flue gas, which is easy to cause catalyst breakdown. Clogging, wear, catalyst poisoning due to heavy metals contained, expensive to operate and invest

Images