Spectrum detection system for diesel SCR ammonia pollution

Abstract

The invention relates to a spectrum detection system for diesel SCR ammonia pollution. The spectrum detection system comprises a photoelectric device unit and a gas path unit, wherein the photoelectric device unit comprises a laser, a splitter, a collimator, a laser driver, a signal generator, a photoelectric detector, a preamplifier, a lock-in amplifier, a data acquisition card and a host computer; the gas path unit comprises a gas pool, a standard gas module, an SCR purification system and a filtration system. The spectrum detection system realizes functions of real-time concentration monitoring, concentration data storage and display and the like of ammonia by using the TDLAS technology as the theoretical basis and combining with the reflecting pool and harmonic detection technology; the spectrum detection system is simple to operate, provides a solid technical basis for the field of detection and application of diesel ammonia pollution, realizes a detection and evaluation system for diesel ammonia emission, greatly improves the system detection accuracy and response speed, and provides new means for the research of emission reduction of a diesel and environmental monitoring.

Description

technical field [0001] The invention belongs to the technical field of gas concentration detection equipment, in particular to a diesel engine SCR ammonia pollution spectrum detection system. Background technique [0002] Energy and the environment are the material basis for the survival and development of human society. As a carrier closely related to energy and the environment, the engine has become a necessity for production and life that is closely related to various industries and families. Due to its advantages of low fuel consumption and high torque, diesel engines are widely used in ship power, power generation, irrigation, vehicle power and other fields, especially in the development of vehicle power. In recent years, with the rapid and continuous growth of diesel vehicles and construction machinery, the main pollutant nitrogen oxides (NO x ) and particulate matter (PM) pollution to the environment has become increasingly prominent, NO x It is one of the main poll...

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Problems solved by technology

Since diesel vehicles, especially heavy-duty diesel machinery vehicles, have a large amount of exhaust gas and a large number of vehicles, their contribution to air pollution is increasing day by day. In the past, the source of ammonium salt pollution that needs to be controlled in PM2.5 monitoring is usually concerned with the denitrification treatment of coal power plants. However, other domestic units that have carried out research on the TDLAS test system have not conducted in-depth research on the detection of ammonia pollution in exhaust emissions during the purification process of diesel engines, nor have they investigated the NH in diesel engine exhaust. 3 The technical means of fast, real-time and high-precision detection of gas are followed up and solved

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