Multi-stage ammonia storage solid ammonia NOx removal system

Abstract

The invention provides a multi-stage ammonia storage type solid ammonia to remove NO x The system includes an ammonia storage-exhaust unit, an ammonia transfer unit and a catalytic reactor; the flue gas is divided into two paths, one of which enters the ammonia storage-exhaust unit and then is discharged and the other merges into the catalytic reactor; the ammonia storage-exhaust unit The ammonia gas inlet and outlet are arranged on the top, and the ammonia gas outlet is connected to the ammonia transfer unit through the ammonia pipe; the ammonia transfer unit is connected to the catalytic reactor through the ammonia valve and the nozzle at the outlet of the ammonia transfer unit. The ammonia storage-exhaust unit of the present invention plays the main role of ammonia supply and ammonia volume early warning, and the ammonia transfer unit plays the role of low-temperature start-up; when the locomotive is started, the ammonia transfer unit and the catalytic reactor are connected to realize NO removal x Low-temperature start-up of the system; by raising the temperature of the ammonia storage-exhaust unit to the threshold temperature, the ammonia storage-exhaust unit and the catalytic reactor are connected to achieve stable ammonia supply during operation; the multi-halide composite adsorbent is used as the ammonia storage ‑The reactive material of the ammonia exhaust unit, when the amount of ammonia is insufficient, it can realize the early warning function of ammonia amount 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

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