Low-temperature adsorption denitration system and process for smoke

Abstract

The invention discloses a low-temperature adsorption denitration system and process for smoke. The low-temperature adsorption denitration system comprises a booster fan, a cooling capacity recoverer,a smoke cooling system, a smoke switching valve and denitration adsorption towers; an inlet of the booster fan communicates with an inlet smoke pipeline, the booster fan, the cooling capacity recoverer, the smoke cooling system, the smoke switching valve and the denitration adsorption towers sequentially communicate, an outlet of the smoke switching valve communicates with the first denitration adsorption tower and the second denitration adsorption tower, smoke outlets of the first denitration adsorption tower and the second denitration adsorption tower communicate with a smoke convergence device, and the smoke convergence device communicates with the cooling capacity recoverer. The two denitration adsorption towers are arranged to perform denitration and regeneration processes in turn, continuous denitration operation of the system can be achieved, the denitration efficiency is high, and adsorbed materials are desorbed and then recycled; and physical adsorption denitration is adopted,meanwhile NO2 and NO are directly adsorbed to be removed, preoxidation of the NO is not needed, strong oxidant and precious metal catalysis is not needed either, the denitration efficiency is high, and zero emission of NO<x> can be achieved.

Description

technical field [0001] The invention belongs to the technical field of flue gas denitrification, and in particular relates to a flue gas low-temperature adsorption denitrification system and process. Background technique [0002] The flue gas produced by coal combustion contains a large amount of nitrogen oxides NOx, which is one of the main causes of air pollution. At present, NOx in the flue gas is mainly removed by the SCR selective catalytic reduction method. In this method, NOx is added to the NH in the flue gas under the action of the catalyst. 3 Revert to harmless N 2 , and then removed. Although the SCR denitrification technology is quite mature, there are still many problems. For example, the catalyst only has high activity in a specific temperature range. When the power plant operating load is adjusted, the change of flue gas temperature will seriously affect the SCR denitrification efficiency. In addition, SCR denitrification has secondary pollution problems s...

AI Technical Summary

Problems solved by technology

Ozone method and hydrogen peroxide method require additional consumption of strong oxidant, high operating costs and easy to cause secondary pollution emissions; catalyst oxidation method requires practical and expensive noble metal catalysts, and is difficult to apply industrially; low-temperature plasma oxidation method consumes high power, which also leads to high running cost

Images