Unlock instant, AI-driven research and patent intelligence for your innovation.

Continuous monitoring device for total non-methane hydrocarbons and its working method

A technology of non-methane total hydrocarbons and monitoring devices, which is applied in the direction of measuring devices, material analysis through optical means, instruments, etc., can solve problems such as interference with methane measurement, inaccurate total hydrocarbon concentration data, and gas pressure fluctuations in the measurement cell, achieving The effect of improving sensitivity and precision

Active Publication Date: 2018-05-22
NANJING PROTON SCI & TECH ENG
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the absorption line of some organic gases (such as methanol) in the wavelength range of 1670-1675nm, it seriously interferes with the measurement of methane and greatly reduces the measurement accuracy of methane concentration
[0010] 2. Sampling flow control is a technical difficulty. Since the concentration of methane in the measured gas is very small (<10ppm) in most cases, the requirements for the sampling flow control of the laser module are very strict, and the sampling flow will directly lead to the measurement The fluctuation of the gas pressure inside the cell leads to the fluctuation of the measured gas concentration value
[0011] 3. The FID detector also has strict requirements on the control of the injection flow rate, otherwise it will cause the hydrogen flame to be unstable, resulting in inaccurate concentration data of total hydrocarbon detection
[0012] Based on the existence of the above technical difficulties, conventional laser spectroscopic gas analysis devices based on DLAS technology have not yet been applied in the monitoring of non-methane total hydrocarbons

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Continuous monitoring device for total non-methane hydrocarbons and its working method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] figure 1 The basic structural diagram of the continuous monitoring device for non-methane total hydrocarbons in Example 1 of the present invention is schematically provided, as figure 1 As shown, the continuous monitoring device includes:

[0043] A light source, such as a laser, used to emit measurement light, the wavelength of the measurement light covers the absorption spectrum line of methane, such as 1573.7nm or 1684.0nm;

[0044] A detection cell, such as a multi-reflection detection cell, which is used to accommodate the gas to be tested;

[0045] A detector, the detector is used to convert the measurement light that passes through the detection cell and is attenuated by the selective absorption of methane into an electrical signal, and transmits it to the calculation module;

[0046] FID detector, the FID detector is used to detect the total hydrocarbon content in the gas to be tested, and the specific structure and working method are prior art in the art, and...

Embodiment 2

[0058] An application example of the continuous monitoring device and its working method according to Embodiment 1 of the present invention.

[0059] In the application example, the light source is a semiconductor laser, and the wavelength modulation technology is adopted, so that the wavelength of the emitted measurement light covers the absorption line of methane at 1573.7nm or 1684.0nm; the detection cell is a White cell; the gas to be measured enters the For the detection pool, the specific flow rate is 5l / min, and the control accuracy needs to reach ±10ml / min; the gas to be tested directly enters the FID detector after flow control, and the specific flow rate is 50ml / min, and the control accuracy needs to reach ±0.1ml / min; Two air suction pumps send the gas to be tested into the FID detector and the detection pool respectively.

[0060] The working method of the above-mentioned continuous monitoring device is:

[0061] (A1) The gas to be tested after flow control is sent...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a continuous monitoring device for non-methane total hydrocarbon and a working method of the continuous monitoring device. The continuous monitoring device comprises an FID (flame ionization detector) and further comprises a light source, a detection cell, a detector and a computation module, wherein the light source is used for emitting measuring light, and an absorption spectral line of methane is covered with wavelength of the measuring light; the detection cell is used for accommodating to-be-measured gas; the detector is used for converting the measuring light penetrating through the to-be-measured gas in the detection cell into electrical signals, and sending the electrical signals to the computation module; the computation module is used for processing the electrical signals with an adsorption spectrum technology to obtain the methane content of the to-be-measured gas, and acquiring the content of non-methane total hydrocarbon in the to-be-measured gas according to the content of total hydrocarbon output by the FID. The continuous monitoring device has the advantages that the non-methane total hydrocarbon is monitored continuously in real time and the like.

Description

technical field [0001] The invention relates to gas analysis, in particular to a continuous monitoring device for total non-methane hydrocarbons and a working method thereof. Background technique [0002] The current non-methane total hydrocarbon analyzers are all intermittent measurement methods based on the principle of gas chromatography. Specifically, the chromatographic separation technology is used to separate the methane in the measured gas and use a hydrogen flame ionization detector (FID) to detect it separately. After removing the methane concentration, the non-methane total hydrocarbon concentration value is obtained. Since the chromatographic column is used to separate the measured gas, and the inert gas backflush is required after each separation of the chromatographic column to prepare for the next measurement, so this method of measurement can only be intermittent detection, and the analysis efficiency is low (generally every 1 to 2 minutes). [0003] At pr...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/3504
CPCG01N21/3504
Inventor 刘罡
Owner NANJING PROTON SCI & TECH ENG