Method and device for strengthening NH3-SCR denitration of low-temperature flue gas by regulating and controlling autorotation of catalyst

Abstract

The invention provides a method for strengthening NH3-SCR denitration of low-temperature flue gas by regulating and controlling autorotation of a catalyst. The method comprises the steps: step 1, sufficiently mixing the low-temperature flue gas and ammonia gas in a molar ratio of (1:1)-(1:1.2) to obtain mixed gas; step 2, conveying the mixed gas to a catalyst autorotation reactor (3); step 3, rotating the mixed gas in a catalyst autorotation reactor (3), and completing SCR reaction on a catalyst micro-interface; step 4, enabling catalyst particles cooled after reaction to fall into a catalyst heating regenerator from the top of a central pipe of the catalyst autorotation reactor (3), carrying out heating regeneration, and discharging purified gas from the top of the catalyst autorotation reactor (3); and step 5, recycling the catalyst after being heated to 300 DEG C or above in the heating regenerator. The method and the device provided by the invention have the advantages of obvious denitration effect, simple process, strong toxicity resistance of the catalyst and low operation cost.

Description

technical field [0001] The invention belongs to the field of air pollution control, in particular to a low-temperature flue gas NH 3 -SCR rotation control enhanced denitrification method and device. Background technique [0002] Nitrogen oxides (NO x ) is one of the main pollutants in flue gas causing air pollution, which poses a serious threat to the environment and biological health. Although the medium-temperature (300°C-3300°C) Selective Catalytic Reduction (SCR) in the power industry has high efficiency and mature technology, but due to the limitation of emission standards and treatment costs, a large number of low-temperature flue gas (120°C-3300°C) NO x Emission control encounters great difficulties, so low-temperature SCR is the main engineering technology to achieve the goal of "Action Plan for Air Pollution Prevention and Control". However, the current obstacles to the industrialization of low-temperature SCR technology lie in the low-temperature activity of the...

AI Technical Summary

Problems solved by technology

Although this method solves the problems of easy ash accumulation, catalyst failure and ammonia escape that often occur in the prior art, the denitrification efficiency is still greatly affected by catalyst performance and reaction temperature, and the application of low-temperature flue gas scenarios is limited

[0007] In summary, the current denitrification equipment at home and abroad, due to the influence of the gas-solid contact area, the flue gas contains a large amount of SO 2 The flow field distribution of the flue gas in the steam tower is uneven, the contact time between the flue gas and the reducing agent and the catalyst is limited, the catalyst is poisoned, the catalytic reduction reaction efficiency is low, and NH is widely present. 3 Runaway, catalyst clogging, catalyst failure, etc.

It not only affects the improvement of denitrification efficiency, but also increases the cost of denitrification and causes secondary pollution and other problems.

[0008] Therefore, the preparation of low-temperature SCR denitration catalysts is currently a research hots

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