Methane value online real-time monitoring system

Patent metadata

Field	Value
Publication number	US-11493438-B2
Application number	US-202117203893-A
Country	US
Kind code	B2
Filing date	Mar 17, 2021
Priority date	Mar 21, 2020
Publication date	Nov 8, 2022
Grant date	Nov 8, 2022

Abstract

The disclosure discloses a methane value online real-time monitoring system, which includes a laser tunable system portion, a gas component detection system portion and a data processing system portion. The laser tunable system portion includes a computer, laser drivers, tunable lasers, a laser beam combiner, a collimator, and a beam expander, which are connected in sequence. The gas component detection system portion includes a gas supply system pipeline, a hose, a valve, and a gas chamber. The data processing system portion includes a detector, lock-in amplifiers, an oscilloscope, and a data acquisition card, which are connected in sequence. In a working process of the methane value online real-time monitoring system, gas mass namely the methane value change can be monitored in real time on line by collecting natural gas introduced into a combustion chamber through a gas supply system pipeline of a natural gas engine.

First claim

What is claimed is:

1. A system, comprising:
a gas chamber, a computer, laser drivers, tunable lasers, a laser beam combiner, a collimator, a beam expander, a detector, and lock-in amplifiers;
wherein the laser drivers are configured to tune wavelengths of the tunable lasers by changing temperatures and electric currents of the tunable lasers;
wherein the laser beam combiner is configured to combine laser beams from the tunable lasers to form a combined laser beam;
wherein the collimator is configured to collimate the combined laser beam and direct the combined laser beam to the beam expander;
wherein the beam expander is configured to expand and direct the combined laser beam into the gas chamber;
wherein the detector is configured to output, to the lock-in amplifiers, a signal representing the combined laser beam that has been refracted by a gas in the gas chamber;
wherein the lock-in amplifiers are configured to extract amplitudes of the wavelengths from the signal and feed the amplitudes to the computer; and
wherein the computer is configured to determine a methane number of the gas based on the amplitudes.

2. The system according to claim 1 , wherein the wavelengths comprise peak absorption wavelengths of methane, ethane, propane, butane, carbon dioxide, and nitrogen.

3. The according to claim 1 , wherein the tunable lasers and the laser drivers are in one-to-one correspondence.

Assignees

• Univ Harbin Eng

Inventors

• Dong Quan
• Zhang Yuqin
• Wang Di
• Lu Changhao
• Ni Zuo
• Yang Xiyu

Classifications

• G01N33/0047

  Organic compounds · CPC title

• G01N21/39 Primary

  using tunable lasers · CPC title

• Y02T10/30

  Use of alternative fuels, e.g. biofuels · CPC title

• G01N33/0036

  specially adapted to detect a particular component (physical analysis of gaseous biological material G01N33/497) · CPC title