On-line multi-point gas sampling analysis system and test method in pipeline internal steady state

A technology of gas sampling and sampling system, which is applied in the direction of sampling, sampling devices, and analysis materials, etc., to achieve fast response, reduce the cost of transformation and upgrading, and increase accuracy

Active Publication Date: 2020-12-11
ZHEJIANG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the current sampling equipment that is compatible with FTIR can only extract gas from one position in the tube to measure the gas composition in a small area of ​​the tube.

Method used

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  • On-line multi-point gas sampling analysis system and test method in pipeline internal steady state
  • On-line multi-point gas sampling analysis system and test method in pipeline internal steady state
  • On-line multi-point gas sampling analysis system and test method in pipeline internal steady state

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0042] The invention provides an online multi-point gas sampling and analysis system in a pipeline internal steady state, including a multi-point sampling system, an electromagnetic valve system, an air extraction heating system, and a control system.

[0043]Multi-point sampling system: mainly refers to the rectification sampling pipe, and also includes the exhaust pipe and the corresponding connection device installed with the rectification sampling pipe. The rectification sampling tube is composed of a rectification cover and a sampling tube. The rectification cover is a short and thick stainless steel tube with an outer diameter of 40mm, a wall thickness of 1mm, and a length of 150mm. The outer ring of the windward side is cut into a slope with an angle of 45°; sampling The tube is a thin and long stainless steel tube. The outer d...

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Abstract

The invention discloses an online multi-point gas sampling and analysis system under a steady state in a pipeline, and a testing method. The system comprises a multipoint sampling system, an electromagnetic valve system, an air exhaust heating system and a control system, wherein the multipoint sampling system comprises a plurality of rectifying and sampling tubes; the electromagnetic valve systemcomprises a plurality of normally-closed electromagnetic needle valves and a filter; each rectifying and sampling tube is externally connected with one normally-closed electromagnetic needle valve; and the air exhaust heating system comprises an electric heating cover, FTIR (Fourier Transform Infrared Spectrometer) equipment, an air-water separator, an air pump and a flowmeter. The system has a simple and reliable structure and low cost, can measure gas ingredients on different positions in the pipeline online, utilizes the rectifying and sampling tubes to extract gas from the pipeline, can reduce an influence of sampling on flowing in the pipeline as much as possible, sets the amount and the positions of the rectifying and sampling tubes according to practical testing requirements, and is suitable for testing various diesel exhaust systems. During testing, a nitrogen blowing process is added in a measurement interval of every two sampling points, and FTIR measurement accuracy can beincreased.

Description

technical field [0001] The invention relates to a system and a corresponding test method for online real-time sampling and analysis of gas components at multiple positions in a pipeline in a steady state, and in particular to a multi-channel system based on an electromagnetic valve, a rectification sampling tube and an air extraction heating device. Point sampling equipment and methods for testing gas distribution across pipe sections. Background technique [0002] The problem of motor vehicle exhaust pollution is becoming more and more serious, especially for diesel engines, which require a complex exhaust after-treatment device to purify the exhaust gas so that it meets the requirements of the corresponding national emission regulations. The emission of nitrogen oxides (NOx) from diesel engines is relatively high. Among many diesel engine emission technologies, ammonia gas generated by urea decomposition is used as the main reducing agent of NOx, and related catalysts are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/24
CPCG01N1/2252
Inventor 吴锋刘子汛姚栋伟汤婷
Owner ZHEJIANG UNIV
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