Desorption-Ammonia Storage Type Solid Ammonia Nox Removal System

Abstract

The invention provides a desorption-ammonia storage type solid ammonia NOx removal system. The system comprises a solid ammonia reactor (1), an ammonia storage device (3) and a catalytic reactor (5);an outlet of the solid ammonia reactor (1) is connected to an inlet of the ammonia storage device (3) through a condensation portion inlet pipeline (9) and a pressure control valve (2); an outlet of the ammonia storage device (3) is connected to an inlet of the catalytic reactor (5) through a pressure control valve (4); the ammonia storage device (3) comprises a condensation portion (31) and an evaporation portion (32); and the condensation portion (31) and the evaporation portion (32) are each provided with an ammonia accommodating space. The condensation portion in the ammonia storage device can achieve a buffering effect, and the evaporation portion can achieve the stable ammonia supply effect. By keeping the condensing temperature of the condensation portion of the ammonia storage device and the evaporation temperature of the evaporation portion stable and adjusting the pressure control valves, the NOx removal operation process of the whole system can be stable and controllable.

Description

technical field [0001] The present invention relates to removal of NO X The system, specifically, involves a desorption-ammonia storage type solid ammonia removal of NO X system. Background technique [0002] Under the background of global active research on reducing the NOx content in locomotive exhaust, the NOx removal system has been more and more widely used. In diesel engine NOx purification technology, existing and proven technical solutions mainly include ammonia selective catalytic reduction technology (NH3-Selective Catalytic Reduction, NH3-SCR for short), hydrocarbon selective catalytic reduction technology (HC-Selective Catalytic Reduction, HC-SCR), storage-reduction technology (NOx-Storage / Reduction, NSR), NOx and PM purification technology and four-way catalytic technology. Among them, the most widely used denitrification technology is urea-SCR technology, that is, NH3-SCR technology. However, the urea-SCR technology has problems in practical application suc...

AI Technical Summary

Problems solved by technology

[0004] However, in the general solid ammonia NOx removal system, the rate of desorption of ammonia in the solid ammonia reactor will be affected by the temperature of the heating module of the solid ammonia reactor and the content of effective solid ammonia components in the solid ammonia reactor, so a stable desorption rate cannot be achieved. , making it difficult to regulate the amount of ammonia entering the catalytic reactor

So far, no research has proposed a solution with a controllable rate of ammonia desorption in solid ammonia reactors

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