Multi-stage ammonia storage type solid ammonia NOx removal system

Abstract

The invention provides a multi-stage ammonia storage type solid ammonia NOx removal system. The multi-stage ammonia storage type solid ammonia NOx removal system comprises an ammonia storage-ammonia discharge unit, an ammonia transfer unit and a catalytic reactor; flue gas is divided into two paths, one path enters the ammonia storage-ammonia discharge unit and then is discharged, and converges with the other path, and enters the catalytic reactor; the ammonia storage-ammonia discharge unit is provided with an ammonia gas inlet and an ammonia gas outlet, and the ammonia gas outlet is connectedwith the ammonia transfer unit through an ammonia pipe; and the ammonia transfer unit is connected with the catalytic reactor through a ammonia transfer unit outlet ammonia valve and a spray pipe. The ammonia storage-ammonia discharge unit plays a role in main ammonia supply and ammonia amount early warning, and the ammonia transfer unit plays a role in low-temperature starting; when a locomotiveis started, the ammonia transfer unit is communicated with the catalytic reactor, so that low-temperature starting of the NOx removal system is realized; after the temperature of the ammonia storage-ammonia discharge unit is increased to a threshold temperature, the ammonia storage-ammonia discharge unit is communicated with the catalytic reactor, so that stable ammonia supply in operation is realized; a polyhalide composite adsorbent is used as a reaction material of the ammonia storage-ammonia discharge unit, and when the ammonia amount is insufficient, an ammonia amount early warning effect can be achieved through multi-stage reaction switching.

Description

technical field [0001] The present invention relates to removal of NO x system, specifically relates to a multi-stage ammonia storage type solid ammonia removal of NO x system; especially relates to a highly stable multi-stage ammonia storage type solid ammonia removal of NO x system. Background technique [0002] In order to solve the problem of nitrogen oxide emissions from gasoline vehicles and diesel vehicles, governments around the world have formulated increasingly stringent policies and regulations. The gap is getting bigger and bigger. The ever-increasing demand for air purification has brought a strong impetus to address vehicle nitrogen oxide emissions. Purify NO after combustion x The main technology includes the direct decomposition of NO x Technology, storage-reduction of NO x technology (NSR), selective catalytic reduction of NO x Technology (SCR) and hybrid NSR-SCR technology, of which the most widely used in industry is the Urea-SCR technology with ur...

AI Technical Summary

Problems solved by technology

When low-temperature solid ammonia is selected as the working fluid, the operation process is faced with the problem of large pressure fluctuations and low safety factor; when medium-high temperature solid ammonia is selected as the working fluid, the operation process is faced with the problem of high start-up temperature and slow start-up speed

At the same time, the existing single-stage solid ammonia removal of NO x In principle, it is impossible to realize the early warning function of the shortage of effective ammonia in solid ammonia, and it is impossible to realize the best continuous ammonia, which reduces the economy and increases the removal of NO x failure probability

Images