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Special measurement system for concurrently measuring ammonia gas and nitrogen oxide in motor tail gas

A nitrogen oxide and measurement system technology, applied in the direction of chemiluminescence/bioluminescence, and analysis through chemical reactions of materials, can solve the problems of high price, high maintenance cost, inconvenient calibration and traceability, etc., and achieve low maintenance cost , high reliability, easy calibration effect

Active Publication Date: 2013-01-02
TIANJIN CPOWER TECH DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are problems such as high price, inconvenient calibration and traceability, and high maintenance costs

Method used

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  • Special measurement system for concurrently measuring ammonia gas and nitrogen oxide in motor tail gas
  • Special measurement system for concurrently measuring ammonia gas and nitrogen oxide in motor tail gas
  • Special measurement system for concurrently measuring ammonia gas and nitrogen oxide in motor tail gas

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Embodiment Construction

[0052] Such as image 3 Shown, the technical principle of the present invention to residual ammonia concentration measurement in engine exhaust is: for containing a small amount of NO x (NO, NO 2 ), NH 3 The direct sampling method is used to collect the final exhaust gas; the direct sampling gas is diluted and mixed with the air measured by the first Venturi tube (CFV1) to form a diluted exhaust gas; the diluted exhaust gas passes through the second Venturi tube (CFV2) ) after measurement, and then divided into two ways to enter CLD measurement line 1 and CLD measurement line 2, and use the measurement of NO to obtain (NH 3 +NO x ) and NO x (NO, NO 2 ) measured value, where:

[0053] The specific operation of CLD measurement line 1 includes: the diluted exhaust gas first passes through the ammonia oxidation catalytic conversion device, and the NH 3 Converted to NO; detected by CLD1, its NO measurement value should be NO x (NO, NO 2 ) and NH 3 The total concentration ...

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Abstract

The present invention discloses a special measurement system for concurrently measuring ammonia gas and nitrogen oxide in motor tail gas. The special measurement system comprises a motor exhaust gas sampling unit, a NOx / NH3 analysis unit and a computer control and management unit. According to the present invention, sample gas and air are subjected to dilution mixing to obtain diluted discharge gas, wherein the air is filtered, and then enters a CFV1 for metering dilution air flow; the diluted discharge gas passes through a CFV2 to meter a dilution discharge gas flow; the resulting gas is divided into two parts according to the flow path, wherein one part of the gas passes through an ammonia gas oxygen catalysis conversion device, and enters a CLD1 to obtain the total NO measurement value containing NH3 concentration, and the other part of the gas directly enters a CLD2 to obtain a NO measurement value, wherein the NO measurement value does not contain NH3; and concentration values of NH3 and NOx are obtained based on the difference between the two measurement values ??of the two parts of the gas. The special measurement system of the present invention has the following advantages that: requirements on engine transient state operating condition power measurement and NH3 measurement by the national stage IV can be met, NH3 / NOx component concentration can be measured simultaneously, measurement precision is high, and the like. In addition, with the present invention, NOx conversion efficiency (SCR catalysis reduction efficiency) can be calculated according to the measurement results.

Description

technical field [0001] The present invention relates to the gas component concentration measurement technology of motor vehicle and internal combustion engine (or called: engine, the same below) exhaust gas emission, especially relates to a kind of using chemiluminescent detection principle (CLD, chemiluminescent detector) to realize ammonia and nitrogen oxide (NH 3 / NO x ) Measuring instruments and measuring methods for co-measurement of component concentrations. Background technique [0002] Statistics show that heavy-duty diesel vehicles account for less than 10% of motor vehicles, but their NO x Emissions accounted for motor vehicle NO x more than 60% of emissions. In my country, heavy-duty diesel vehicles with more than 9 passenger cars and trucks with a total weight of more than 3.5 tons account for more than 50% of the heavy-duty diesel vehicles, so their nitrogen oxides and particulate matter (NO x +PM) emissions are bound to account for the vast majority of mot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/76
Inventor 李德宽李斌
Owner TIANJIN CPOWER TECH DEV CO LTD
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