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On-line monitoring device for content of methane and non-methane total hydrocarbon

A technology of non-methane total hydrocarbons and monitoring devices, applied in measurement devices, material analysis by optical means, instruments, etc., can solve the problems of complex detection devices and slow detection speed, avoid mutual interference, avoid the use of consumables, cost saving effect

Active Publication Date: 2019-11-05
大连世有电力科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention provides an online monitoring device for methane and non-methane total hydrocarbon content in order to solve the problems of slow detection speed and complicated detection devices in existing detection devices

Method used

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  • On-line monitoring device for content of methane and non-methane total hydrocarbon
  • On-line monitoring device for content of methane and non-methane total hydrocarbon

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specific Embodiment approach 1

[0013] Specific implementation mode 1. Combination figure 1 Description of this embodiment, an online monitoring device for methane and non-methane total hydrocarbon content, combined with figure 1 , the monitoring device includes a main controller 1, a mid-infrared LED 3, a near-infrared laser 2, an electro-optic modulator 4, an optical filter 5, a gas absorption cell 6, a spectroscopic prism 7, a mid-infrared pyroelectric detector 8, a near-infrared Photodiode 9, full-wave rectifier bridge 10, analog-to-digital converter 11 and sampling device 12;

[0014] The mid-infrared LED 3 and the near-infrared laser 2 are simultaneously connected to the electro-optic modulator 4, the electro-optic modulator 4 is connected to the optical filter 5, and the optical filter 5 is connected to the gas absorption cell 6 connected, the gas absorption cell 6 is connected to the dichroic prism 7, and the dichroic prism 7 is connected to the mid-infrared pyroelectric detector 8 and the near-infr...

specific Embodiment approach 2

[0021] Specific embodiment two, combine figure 2 Describe this embodiment, this embodiment is another kind of structure of the on-line monitoring device of a kind of methane and non-methane total hydrocarbon content described in specific embodiment 1, wherein, adopt nickel-chromium alloy light source 16 to replace mid-infrared LED3, adopt step The electro-optic modulator 4 is replaced by the external modulation light-blocking sheet 15 fixed on the stepping motor 14 rotating shaft; the splitting prism 7 is removed, and the mid-infrared pyroelectric detector is replaced by a dual-wavelength infrared photodetector 17 8 and a near-infrared photodiode 9;

[0022] With the rotation of the stepping motor 14, the external modulation light blocking sheet 15 periodically blocks the mid-infrared light signal emitted by the nickel-chromium alloy light source 16 with a wavelength of 2-5 um to generate light and dark modulation, which is passed through the main controller 1 Controlling th...

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Abstract

The invention belongs to the technical field of industrial control and relates to an on-line monitoring device for methane and non-methane total hydrocarbon so as to solve the problems that an existing detection device is low in detection speed and complicated. The device includes a mid-infrared LED, a near-infrared laser, an electro-optic modulator, an optical filter, a gas absorption pool, a beam splitting prism, a pyroelectric mid-infrared detector, a near-infrared photodiode, a full-wave rectifier bridge, an analog-digital converter and a sampling device. The mid-infrared LED light sourceand the near-infrared semiconductor laser are adopted, and the concentration of the methane and the concentration of the total hydrocarbon are measured at the same time by using the same optical gas absorption pool. The external modulation technology is used for modulating a mid-infrared light source and a near-infrared light source at the same frequency synchronously, multiple reflections are realized through a reflection lens, optical paths are increased to improve the sensitivity of gas detection, and the adoption of the photoelectric detector of different wavebands can avoid mutual interference between different measured components.

Description

technical field [0001] The invention relates to the technical field of industrial control, in particular to an online monitoring device for methane and non-methane total hydrocarbon content. Background technique [0002] With the development of the economy and the progress of society, many industrial industries have produced a large amount of VOCs (volatile organic compounds) in the production process. my country's relevant air quality standards and emission standards include various VOCs, and the target substances of standard analysis methods for ambient air VOCs at home and abroad also include various VOCs. [0003] At present, there are many methods for monitoring various VOCs in the atmosphere: PID sensors and thermal conductivity detectors respond to all VOCs, but the sensitivity and accuracy are relatively low, and the content ratio of different components cannot be distinguished. Gas chromatography: High detection accuracy and can distinguish most types of VOCS, but t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/3504G01N21/359
CPCG01N21/3504G01N21/359
Inventor 王世有
Owner 大连世有电力科技有限公司
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