Enrichment detection and analysis device for online measurement of ultralow-concentration VOCs (Volatile Organic Compounds)
An analysis device and ultra-low concentration technology, which is applied in the field of enrichment detection and analysis devices for online measurement of ultra-low concentration VOC, can solve the problems of low heat transfer efficiency of mica sheet, high-temperature failure and deterioration of enrichment adsorption materials, and long response time of temperature sensors And other problems, to achieve the effect of rapid temperature sensing
Pending Publication Date: 2020-07-24
苏州天蓝分析仪器有限公司
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Problems solved by technology
[0010] In the above process, the heat transfer efficiency of the mica sheet is low, resulting in the heating time of the enrichment tube far exceeding the ideal time of 5 seconds; the temperature sensor and the glass tube are not tightly bonded, and the response time of the temperature sensor is long. As a result, when the temperature detected by the sensor reaches 300 degrees, the instantaneous temperature of the enrichment tube may have exceeded 400 degrees, and the upper limit of the temperature resistance of the enrichment adsorption material does not exceed 350 degrees, which will easily lead to high temperature failure and deterioration of the enrichment adsorption material
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[0030] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, so that those skilled in the art can better understand the present invention and implement it, but the examples given are not intended to limit the present invention.
[0031] The enrichment tube is made of SS316L stainless steel tube, and the inner wall is silanized and passivated to reduce the adsorption of VOC; the enrichment tube is filled with solid enrichment adsorption powder fillers that meet the requirements of the national standard.
[0032] The temperature sensor is a thermocouple temperature sensor, and the temperature sensing point of the thermocouple is welded into one body with the stainless steel enrichment tube by means of fusion spot welding. In this way, the temperature of the enrichment tube becomes the temperature of the temperature sensing point of the thermocouple, and the heat transfer rate of the fused metal far exceeds th...
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The invention discloses an enrichment detection and analysis device for online measurement of ultralow-concentration VOCs (Volatile Organic Compounds). The enrichment detection and analysis device comprises an enrichment pipe and a temperature sensor, wherein the enrichment pipe is a stainless steel pipe; the enrichment pipe is filled with solid enrichment adsorption powder filler; a thermocoupletemperature sensor is adopted as the temperature sensor; a temperature sensing point of a thermocouple and the stainless steel enrichment pipe are welded into a whole through a fusion spot welding method; and the stainless steel enrichment pipe is clamped by two open U-shaped copper clamps at the two ends of the enrichment pipe. The enrichment detection and analysis device has the beneficial effects that the thermocouple temperature sensor is adopted as the temperature sensor, and the temperature sensing point of the thermocouple and the stainless steel enrichment pipe are welded into a wholethrough the fusion spot welding method, so that the temperature of the enrichment pipe is changed into the temperature of the temperature sensing point of the thermocouple; the metal heat transfer speed of whole formed by fusion far exceeds the speed of a ceramic temperature sensor; and the function of rapidly sensing the temperature is realized.
Description
technical field [0001] The invention relates to the field of VOC measurement, in particular to an enrichment detection and analysis device for online measurement of ultra-low concentration VOC. Background technique [0002] Environmental protection departments need to conduct online continuous monitoring of volatile organic pollutants (VOC for short) in the ambient air around more and more industrial parks. [0003] The concentration of VOC components in the ambient air is very low, and the VOC pollution factors to be monitored need to be enriched at low temperature, analyzed at high temperature, and then sent to chromatography for analysis. [0004] Due to the continuous work and unattended characteristics of online equipment, the general enrichment sampling uses the enrichment tube filled with solid adsorption material as the adsorption unit, enrichment sampling under low temperature conditions, instantaneous (generally the temperature rise time does not exceed 5 seconds) ...
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IPC IPC(8): G01N30/02G01N30/08G01N30/14G01N30/30
CPCG01N30/02G01N30/08G01N30/14G01N30/30
Inventor 李伟庄晓冬
Owner 苏州天蓝分析仪器有限公司