Method for researching smell characteristics of multi-component gas in dynamic mixing mode

A technology of dynamic mixing and mixing of gases, applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve the problems of decreased odor intensity, inability to fully reflect the influence of odor grade and type, and inability to reflect the impact, etc. The effect of research speed

Pending Publication Date: 2022-01-28
CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD +1
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, it has been found through research that such a fixed-proportion mixed gas exhibits the same odor characteristics as the single-component trend. For example, when the mixed gas of A and B is considered to be a single substance of C, the odor studied by the olfactory diluter The law mainly expresses the law of C, a

Method used

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  • Method for researching smell characteristics of multi-component gas in dynamic mixing mode
  • Method for researching smell characteristics of multi-component gas in dynamic mixing mode
  • Method for researching smell characteristics of multi-component gas in dynamic mixing mode

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0085] DETAILED DESCRIPTION OF THE INVENTION

[0086] Evaluation Gas Preparation: Take n-butanol, prepare 10L air bag, charge 5L nitrogen in the air bag, turn off the air bag valve, and use injection to injection 10 μl of n-butanol according to the injection port of the air bag, 40 ° C Balance 30 min. The 5L gas is charged, thoroughly mixed, resulting in a high-concentration gas as a raw sample of dilution lyvous.

[0087] Equipment Pipeline Aging Cleaning: Since the odor gas has adsorption, the air path is required to perform high temperature aging, the aging temperature is 65 ° C, time 5 min, and then purified by pure nitrogen, and purge 2min.

[0088] Equipment dilution process: The two groups of mixed gases are connected to the multi-channel dynamic sniffing dilute, through the instrument setting, the dilution ratio of each gas path, such as 4000 times dilution of the A channel, B channel dilute 3000 times.

[0089] Gas mixing and evaluation: All gases entering multiple channe...

Example Embodiment

[0106] Example 1:

[0107] Two kinds of single substance concentrations and odor grades of the same ratio 1, the subjective odor level of acetic acid is D = 0.9837 · LogC + 4.0726, the relationship between benzothiazole is D = 0.9837 · LogC + 3.4096.

[0108] According to the dilution method of this standard, the two bags are accessed to the A channel and B channel of multi-channel lyvous diluters, and the original concentration of the A gas bag is 116 ng / ml, and the original concentration of the B gas bag is 275 ng / ml. The two bags of gases were diluted and combined with the ratio of Table 4, and the dilution ratio in the table can be obtained, and 16 combinations can be obtained, and the sniffing staff will smell and record the 辨 result, as shown in Table 5

[0109] Table 4 Two-component dilution scale

[0110]

[0111] Table 5 Two-component multi gradient mixed gas odor rating results

[0112]

[0113]

[0114] Analysis of the above data can be seen that the method ca...

Example Embodiment

[0116] Example 2:

[0117] A variety of single substance concentrations and odor grades are the same, and each material obtains D = A · Logc + B fitting straight line, and the integration of odor estimation, such asFigure 9 Indicated.

[0118] According to the dilution method of this standard, the four bags are accessed to the A channel to the multi-channel lyvous diluer to the D channel, and the original concentration of the A gas bag is 116 ng / ml, the original concentration of the B gas bag is 275 ng / ml, The original concentration of the C gas bag was 305 ng / ml. The original concentration of the D airbag was 122 ng / ml, and the two bags of gases were diluted and combined with the proportion of Table 6, and there were 16 kinds of dilution ratios. Combination, the sniffing member is robbed and records the olfactory result, as shown in Table 7.

[0119] Table 6 Four components dilution proportion

[0120]

[0121] Table 7 Four components multi gradient mixed gas odor ratin...

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Abstract

The invention provides a method for researching smell characteristics of multi-component gas in a dynamic mixing mode. The method comprises the following steps of S1, preparing a single-component standard gas for a plurality of single substances by using a standard solution and nitrogen; S2, researching the relationship between the odor grade and the concentration of the plurality of single-substance standard gases obtained in the step S1 through a sniffing dilution instrument; and S3, mixing the plurality of single-substance standard gases obtained in the S1, exporting the mixed gas to a sniffing port, and judging the relationship of the mixed gas. According to the method for researching the smell characteristics of the multi-component gas in the dynamic mixing mode, a problem that the concentration ratio of the smell substances is fixed is solved, the concentration of each smell substance in each test can be set at will, the research speed is greatly increased, and the requirement for consumption of smell bag consumables is reduced.

Description

technical field [0001] The invention belongs to the field of odor detection, and in particular relates to a method for studying the odor characteristics of multi-component gases in a dynamic mixing mode. Background technique [0002] When studying the law of odor levels in the traditional way, micro-sampling needles are used to inject high-purity liquids into fixed-volume air bags, and nitrogen shocks are used to mix and prepare high-concentration standard gases to be evaluated. Long-term evaluation of odors will reduce the sensitivity to odors. Sensitivity, from the maximum dilution ratio of 14000 times, gradually diluted to 1 times. There is a proportional relationship between the concentration of the dilution gas and the concentration of the standard gas, as shown in formula (1). [0003] [0004] In the formula: C 0 - standard gas concentration; [0005] C i - standard gas concentration; [0006] k—dilution ratio; [0007] At the dilution olfactory mouth, strict...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/0001
Inventor 姚谦王焰孟李传杰刘亚林胡俊艳李骊璇武金娜冯世豪李晶王崇
Owner CATARC AUTOMOTIVE TEST CENT TIANJIN CO LTD
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