Integrated sample gas suction-assisted dilution module and working method thereof

Abstract

The invention discloses an integrated sample gas suction-assisted dilution module and a working method thereof. The dilution module comprises a filter, a jet pump and a dilution unit which are integrated in a shell, the shell is provided with a sample gas inlet, a standard gas and reverse blowing connector, a zero gas inlet and a mixed sample gas outlet, the sample gas inlet is communicated with the dilution unit through the filter, the zero gas inlet and the mixed sample gas outlet are both communicated with the dilution unit, the sample gas inlet is communicated with the jet pump through a plurality of pumping assisting pipelines, and the sample gas inlet and the standard gas are communicated with the back flushing interface. Based on the integrated module design, the whole dilution module can realize the heat tracing function of all parts only by using one heat tracing system, so that the heat tracing structure of the system is greatly simplified, the probability that the temperature control link of the system goes wrong is reduced, the reliability of the whole system is improved, and meanwhile, the volume of the dilution module is greatly reduced.

Description

technical field [0001] The invention relates to an integrated sample gas-assisted extraction dilution module and a working method thereof, and belongs to the technical field of flue gas monitoring systems. Background technique [0002] The dilution method is a common sample gas sampling and processing method in the flue gas monitoring system. [0003] The dilution method uses the principle of sonic small hole (also called critical small hole), that is, when there is a certain pressure difference before and after the small hole, and when the fluid flows through the small hole, for a certain pore diameter, the flow rate through the small hole increases with the pressure difference. Big and increase. But when the pressure difference exceeds a certain value (called the critical pressure difference), the flow velocity of the fluid passing through the shrinkage hole of the small hole reaches the speed of sound. At this time, no matter how the pressure difference increases, the fl...

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Problems solved by technology

[0010] Purpose of the invention: In view of the problem that when the traditional dilution module is connected with an external pumping-assisted jet pump and used at the SCR outlet, it is easy to cause pipeline blockage and greatly increase the difficulty of heat tracing in the system. The present invention provides an integrated sample gas-assisted pumping dilution module and its working method , the module integrates jet pump, filter, dilution unit and other components into one shell, realizes the design of all internal pipelines, greatly simplifies the heat tracing structure of the system, and effectively improves the overall reliability of the system

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