Simultaneous measurement system and method for ammonia gas, nitric oxide and nitrogen dioxide in engine tail gas

Abstract

The invention aims at providing a simultaneous measurement system and method for ammonia gas, nitric oxide and nitrogen dioxide in engine tail gas. The simultaneous measurement system comprises a tail gas sample collector, a tail gas sample flow division control system and CLDs. The tail gas sample flow division control system comprises a PLC electronic control system and an electronic control valve. The tail gas sample collector is connected with the PLC electronic control system through a delivery pump. The PLC electronic control system is connected with the electronic control valve. The electronic control valve comprises a first outlet, a second outlet and a third outlet, the first outlet, the second outlet and the third outlet are communicated with a line 1, a line 2 and a line 3 respectively, a line 1 flow controller and the corresponding CLD are installed on the line 1 in sequence, a line 2 flow controller, an NH3 catalytic reactor, a line 2 NOX catalytic reactor and the corresponding CLD are installed on the line 2 in sequence, and a line 3 flow controller, an NH3 catalytic reactor and the corresponding CLD are installed on the line 3 in sequence. By means of the simultaneous measurement system and method, the concentrations of NH3, NO and NO2 in tail gas can be instantaneously detected and simultaneously and precisely measured.

Description

technical field [0001] The invention relates to a measuring device and a measuring method thereof, in particular to a measuring device and a measuring method of engine exhaust. Background technique [0002] With the rapid development of my country's economy, my country's transportation industry has also developed accordingly. The development of the transportation industry has brought about an increase in the number of transportation vehicles such as automobiles and ships. However, with the increase of these motor vehicles, the emission of engine exhaust also increases, and the NOx gas in the exhaust has caused different degrees of damage to the ecological environment and affected people's quality of life. In existing engines, the emission of NOx in the exhaust of heavy-duty diesel engines is more than 60%, which is the main source of harmful gases. Therefore, it is of great practical significance to accurately detect the NOx components in the exhaust gas. [0003] At prese...

AI Technical Summary

Problems solved by technology

However, this method does not provide accurate measurements of NO and NO2 in the NOx component

At the same time, the two CLD detectors in the detection system will increase the weight of the overall detection system, increase the occupied area, and increase the complexity of the detection system

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