The result shows that the length of the samplingpipe inserted into the vent-pipe and the vent-pipe's airproof are the key factors for the correct exhaust emissions results.
When sampling, the speed of sample gas is similar to the actural pipe gas by controlling the sample gas flow.
取样时通过控制采样流量，使样气流速模拟取样点管道中煤气流速达到等速取样的条件。
3
The test result shows absorption of air pipe with automatic monitoring sampling is main reasons causing lower value than that of the five days sampling method do.