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VOCs monitoring system for in-situ thermal desorption

A monitoring system, thermal desorption technology, applied in the direction of measuring devices, material analysis through electromagnetic means, instruments, etc., can solve the problems of inconvenient soil thermal sampling, difficulty in controlling the VOCs concentration of the restoration progress, etc., to improve energy utilization rate, Reduce secondary pollution and ensure normal operation

Pending Publication Date: 2020-02-11
广西博测检测技术服务有限公司
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Problems solved by technology

[0005] The purpose of the present invention is to provide a VOCs monitoring system for in-situ thermal desorption, which solves the inconvenience of soil thermal sampling in the existing in-situ thermal desorption technology, and it is difficult to control the actual repair progress and monitor the high-temperature and high-negative-pressure gas. Technical issues such as VOCs concentration

Method used

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Embodiment 1

[0023] Such as figure 1 As shown, the present invention is a VOCs monitoring system for in-situ thermal desorption, which includes a central control device 1, an air intake pipe 2, a cooling system 3, a flow control system 4, a vacuum pump 5, a PID photoion detector 6, a return Trachea 7, extraction main pipe 8. The central control device 1 is used to control the start and stop of equipment in the system and the collection and processing of corresponding data signals; the air inlet pipe 2 is the air inlet channel for gas sampling, and is connected to the extraction main pipe 8 at the same time as the air return pipe 7 , balance the pressure difference between the inlet and outlet of gas detection, improve the measurement accuracy; the flow control system includes a flow meter and a regulating valve, which can be remotely controlled to adjust the intake flow; the PID photoion detector includes a PID photoion detector and data acquisition The transmission system can detect the ...

specific Embodiment

[0026] In a VOCs-contaminated site, the in-situ thermal desorption technology was used to remediate the polluted soil. The high-temperature tail gas generated was extracted by negative pressure and collected to the extraction main pipe 8. First, the semiconductor cooler 9 in the cooling system 3 was turned on and pre-cooled to Set the temperature, then turn on the flow control system 4 and the vacuum pump 5 to adjust to the set flow rate, the high temperature and high negative pressure gas is pumped from the extraction main pipe 8 to the intake pipe 2 through the vacuum pump 5, cooled by the semiconductor cooler 9, and filtered by the gas filter 10 After entering the PID photoion detector 6, the signal fed back by the PID photoion detector 6 according to the VOCs concentration in the gas is converted by the data acquisition and transmission system and then sent to the central control device 1. After the detection, the gas is discharged into the extraction main pipe through the g...

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Abstract

The invention discloses a VOCs monitoring system for in-situ thermal desorption, and belongs to the technical field of soil in-situ thermal desorption. The system comprises a central control device, an air inlet pipe, a cooling system, a flow control system, a vacuum pump, a PID photoion detector, an air return pipe and an extraction header pipe, one end of the air inlet pipe is connected with thefront end of the extraction header pipe, the other end of the air inlet pipe is connected with the cooling system, the cooling system is connected with the vacuum pump through the flow control system, the vacuum pump is connected with the PID photoion detector, the PID photoion detector is connected with the rear end of the of the extraction header pipe through the air return pipe, and the central control device is connected with the cooling system, the flow control system, the vacuum pump and the PID photoion detector through a PLC. An exhaust port is connected back to the exhaustion headerpipe to form an air return pipe, the pressure difference between the air inlet and the air outlet is reduced, the measuring precision is improved, and secondary pollution is reduced. The cooling system is arranged to reduce the air temperature and water content, and normal operation of a measuring instrument is guaranteed.

Description

technical field [0001] The invention relates to the technical field of in-situ thermal desorption of soil, in particular to a VOCs monitoring system for in-situ thermal desorption. Background technique [0002] In the remediation technology of VOCs-contaminated sites, in-situ thermal desorption has received extensive attention because of its fast remediation speed, complete removal of pollutants, and small secondary pollution. However, limited by the dense pipelines in the in-situ thermal desorption site and the inconvenience of soil thermal sampling, it is often difficult to control the actual restoration progress in actual operation, which may easily lead to incomplete restoration and excessive heating to waste resources. [0003] In view of the above problems, the present invention is a VOCs online monitoring system for in-situ thermal desorption, which can monitor the concentration of VOCs in the extraction pipeline of the in-situ thermal desorption system in real time a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/64
CPCG01N27/64
Inventor 周永信朱红祥覃当麟黄锦孙张子安廖长君苏建赵志勇黄祖浩詹磊汤桂腾王延海苏丽梅
Owner 广西博测检测技术服务有限公司
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