Sample gas diluting system workable in negative-pressure environment
A sample and negative pressure technology, applied in the field of sample gas dilution system, can solve problems such as distortion of gas chromatograph detection results, fluctuation of sample gas concentration in the dilution gas pipe, etc.
Active Publication Date: 2017-12-29
上海炫一智能科技有限公司
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Problems solved by technology
[0004] The dilution gas pipe is connected to the sample pump. During the working process of the sample pump, the air pressure in the dilution gas pipe is lower than the standard atmospheric pressure. At this time, the flow rate of the carrier gas in the carrier gas pipe and the flow rate of the original sample gas in the sample gas pipe change instantaneously, which will cause dilution. The concentration of sample gas in the trachea fluctuates
When the sample pump draws the sample gas whose concentration fluctuates and sends it to the gas chromatograph for detection, the detection results of the gas chromatograph will be distorted
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[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0023] On the contrary, the invention covers any alternatives, modifications, equivalent methods and schemes within the spirit and scope of the invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. It is without the description of these details that the present invention can be fully understood by those skilled in the art.
[0024] like figure 1 As shown, a sample gas dilution system that can work in a negative pressure ...
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The invention discloses a sample gas diluting system workable in a negative-pressure environment. The sample gas diluting system comprises a first regulating valve, a second regulating valve and a gas pipe assembly, wherein the gas pipe assembly comprises a carrier gas pipe, a sample gas pipe, a diluent gas pipe and a pipe joint, and the carrier gas pipe and the sample gas pipe are separately communicated with the diluent gas pipe via the pipe joint. The sample gas diluting system further comprises a flow sensor, a first pressure sensor, a second pressure sensor and a negative-pressure sensor. The sample gas pipe comprises an air resistance section located between the second pressure sensor and the pipe joint. The negative-pressure sensor is arranged on the pipe joint or at a position close to the pipe joint. The sample gas diluting system provided by the invention can provide diluted sample gas with a stale concentration for a gas chromatograph, so the detection precision of the gas chromatograph can be improved.
Description
technical field [0001] The invention relates to a sample gas dilution system which can work in a negative pressure environment. Background technique [0002] Gas chromatography is widely used in petroleum, chemical industry, biochemistry, medicine and health, food industry, environmental protection, etc., and can perform quantitative and qualitative analysis of gases. In order to obtain sample gas with different concentrations, the original sample gas needs to be diluted. [0003] The existing sample gas dilution system includes a first regulating valve, a second regulating valve and a gas pipe assembly. The gas pipe assembly includes a carrier gas pipe, a sample gas pipe and a dilution gas pipe for connecting the carrier gas pipe and the sample gas pipe. The first regulating valve is installed on the carrier gas pipe. The upper part is used to adjust the gas flow rate of the carrier gas flowing through the carrier gas tube per unit time. The second regulating valve is inst...
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IPC IPC(8): G01N1/38G01N30/02
CPCG01N1/38G01N30/02G01N2030/025
Inventor 张彦俊
Owner 上海炫一智能科技有限公司