Isokinetic sampling and constant flow control system for flue particulate matter based on jet modulation and its pretreatment method

Abstract

The invention discloses a constant speed sampling and constant current control system for flue channel particulate matters based on jet modulation and a pre-processing method of flue channel by adopting the system. The constant speed sampling and constant current control system for the flue channel particulate matters based on jet modulation comprises a jet modulation sub-system, a zero-gas preparation sub-system, a zero-gas control sub-system, a sample gas introduction sub-system, a sample gas mixing sub-system, a sample gas heating sub-system, a sample gas dehumidification sub-system, a particulate matter detection sub-system and an air compressor. According to the constant speed sampling and constant current control system for the flue channel particulate matters based on jet modulationand the pre-processing method of the flue channel by adopting the system disclosed by the invention, a constant speed sampling technology of flue channel particulate matters based on jet modulation is adopted, an air compression source is used as a power source of a plurality of jet modulation systems, so that power is provided for the flow-controlled jet modulation systems in all levels of functional sub-systems; by utilizing negative pressure produced by the jet modulation systems, to-be-detected sample gas is pumped, and automatic constant speed sampling control of the flue gas in a flue channel is realized through the jet modulation systems (consisting of a solenoid valve, a flowmeter, a controller and the like).

Description

technical field [0001] The invention belongs to the field of real-time on-line monitoring, in particular to a flue particle constant-velocity sampling system and constant flow control technology and a method for pretreatment of flue gas by using the system. Background technique [0002] At present, the main factor affecting the technical performance of the particle monitoring system in CEMS is how to satisfy the stable and reliable operation of the measuring instrument under the above-mentioned complex working conditions under the conditions of high temperature, high humidity, high flow rate, and low concentration, and have high sensitivity. , accuracy, precision and small error rate to meet the needs of actual monitoring. [0003] Isokinetic sampling, dehumidification, cooling, dilution and other sample gas pretreatment methods are the main ways to solve the above problems. The national standard "Determination of Particulate Matter in Exhaust from Stationary Pollution Sour...

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Problems solved by technology

[0005] The shortcomings of using a negative pressure vacuum pump to pump sample gas are mainly manifested in the following aspects. First, if the vacuum pump wants to achieve a certain negative pressure pumping, the pumping flow must be increased, so the power consumption is relatively large; In the case of continuous work, the working life is relatively short and easy to be damaged. The third is that in a continuous monitoring system, there are multiple subsystems that need to pretreat the sample gas, such as: dehumidification, dilution, instrument detection, etc., using multiple distributed The system structure of the vacuum pump layout is difficult to control the constant flow of the whole system, and it is also difficult to guarantee the realization of constant speed sampling

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