Nitrogen oxide collecting device

Abstract

The invention discloses a nitrogen oxide collecting device, which comprises a sampling chamber, a piston located in the sampling chamber and a driving mechanism used for driving the piston, wherein the driving mechanism is connected with a controller, the side wall, opposite to the piston, in the sampling chamber is a front side wall, a sampling opening is formed in the front side wall, and a filter element used for filtering a gas sample is arranged on the periphery of the sampling opening. A high-pressure gas inlet for introducing external high-pressure gas to flush the filter element is formed in the front part of the sampling chamber, and a first limiting switch connected with the controller and used for detecting whether the piston is attached to the front side wall or not is further arranged in the sampling chamber. In the process of backwashing the filter element, high-pressure gas enters the sampling chamber along the high-pressure gas inlet and flows out along the sampling opening to carry out backwashing on the filter element. After washing is completed, the driving mechanism controls the piston to move forwards, and washing gas is exhausted. When the piston is attached to the first limiting switch, gas in the sampling chamber is completely exhausted, so that the gas sample is prevented from being polluted.

Description

technical field [0001] The invention relates to the technical field of detection equipment, in particular to a nitrogen oxide collection device. Background technique [0002] With the rapid development of my country's economy, the harm of nitrogen oxides (NOX) emitted by coke ovens has been paid more and more attention, and corresponding emission control standards have been formulated. The premise of nitrogen oxide control is to be able to collect accurate and reliable nitrogen oxide samples. Exhaust gas from coke ovens contains a large amount of solid particles. If these solid particles are not treated, they will eventually affect the measurement results of nitrogen oxides. During the actual collection process of exhaust gas, the solid particles in the exhaust gas will be adsorbed in the ceramic filter element in the collection instrument. If the solid particles accumulate for a long time, the collection instrument will be blocked, and the clogged collection instrument can...

AI Technical Summary

Problems solved by technology

However, the high-pressure gas used in this method may contaminate the sample, causing the defect of sample distortion

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