Device for real time online monitoring concentration of SO3 gas in flue gas

A gas concentration and flue gas technology, applied in the direction of measuring devices, color/spectral characteristic measurement, material analysis through optical means, etc., can solve problems such as difficulty in concentration detection

Active Publication Date: 2018-05-01
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And thanks to SO 3 Absorption spectrum and H 2 O, SO 2 molecule at 1400cm -1 There is considerable overlap in nearby bands, and it is difficult to separate the H 2 O, SO 2 Molecules, so when using TDLAS technology to detect SO 3 The detection of concentration has always been difficult

Method used

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  • Device for real time online monitoring concentration of SO3 gas in flue gas

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Effect test

example 1

[0034] Using the above real-time online monitoring of SO in flue gas 3 The device and method of gas concentration are used to control SO at the outlet of a power plant 3 Concentrations were measured and unit load maintained at 300 MW. A 10 kV AC high voltage was applied to the absorption cell, and needle-plate electrodes were used. The optical analysis module uses a 7.16 μm quantum cascade laser and corresponding detectors. The signal of the photodetector is collected by the data acquisition card, and the signal is finally processed by the Labview program. Under this condition, SO 3 The average concentration is 21.57 mg / Nm 3 . Using the method in the national standard "Performance Test Method for Coal-fired Flue Gas Desulfurization Equipment—GB / T21508-2008" to obtain SO 3 The concentration is 21.35 mg / Nm 3 .

Embodiment 2

[0036] Using the above real-time online monitoring of SO in flue gas 3 The device and method of gas concentration are used to control SO at the outlet of a power plant 3 Concentrations were measured and unit load maintained at 200 MW. 100 kV AC high voltage was applied to the absorption pool, and needle-plate electrodes were used. The optical analysis module uses a 7.16 μm quantum cascade laser and corresponding detectors. The signal of the photodetector is collected by the data acquisition card, and the signal is finally processed by the Labview program. Under this condition, SO 3 The average concentration is 15.21mg / Nm 3 . Using the method in the national standard "Performance Test Method for Coal-fired Flue Gas Desulfurization Equipment—GB / T21508-2008" to obtain SO 3 The concentration is 15.02 mg / Nm 3 .

Embodiment 3

[0038] Using the above real-time online monitoring of SO in flue gas 3 The device and method of gas concentration are used to control SO at the outlet of a power plant 3 Concentrations were measured and unit load maintained at 300 MW. 10 kV AC high voltage is applied to the absorption cell, and column-plate electrodes are used. The optical analysis module uses a 7.16 μm quantum cascade laser and corresponding detectors. The signal of the photodetector is collected by the data acquisition card, and the signal is finally processed by the Labview program. Under this condition, SO 3 The average concentration is 21.65 mg / Nm 3 . Using the method in the national standard "Performance Test Method for Coal-fired Flue Gas Desulfurization Equipment—GB / T21508-2008" to obtain SO 3 The concentration is 21.34 mg / Nm 3 .

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Abstract

The invention discloses a device for real time online monitoring the concentration of SO3 gas in flue gas. A light source, a collimation lens, a gas absorption pool, a focusing lens, a photoelectric detector and data processing equipment are arranged in sequence from left to right, wherein the top inner wall of the gas absorption pool is provided with a first electrode; the bottom inner wall of the gas absorption pool is provided with a second electrode; the first electrode and the second electrode are connected with a power supply. The device has the beneficial effects that a non-uniform electric field is coupled into the gas absorption pool, and SO2 and H2O molecules are enriched in an area with high electric field intensity, so that the effect of separating the SO3 gas is achieved. Theabsorption characteristic peaks of the SO3 gas in the flue gas under a non-uniform electric field environment are scanned by laser light of corresponding wavebands to obtain a high-fineness absorptionspectrum of the gas, and high-accuracy real-time online analysis of the SO3 gas is performed by relevant technical means such as TDLAS (Tunable Diode Laser Absorption Spectroscopy).

Description

technical field [0001] The invention relates to the technical field of real-time on-line detection and analysis of gas, in particular to a real-time on-line monitoring of SO in flue gas 3 Apparatus and method for gas concentration. Background technique [0002] Since the "Twelfth Five-Year Plan", with the increasing control standards of nitrogen oxide emissions, denitrification technology has been widely used in thermal power units. Among them, selective catalytic reduction (SCR) technology has the highest denitrification efficiency and has become the current efficient control of nitrogen oxides. The first choice for waste emissions. However, the commercial catalysts used in the SCR technology process will also lead to SO in the flue gas 2 converted to SO 3 , increasing the SO in the flue gas 3 content. In addition, part of the sulfur will be oxidized to SO during the coal combustion process. 3 . Therefore, SO in coal-fired power plant pollutants 3 The emissions ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/01G01N21/39
CPCG01N21/01G01N21/39
Inventor 王晗丁艳军彭志敏蔡文琦刘金亮
Owner TSINGHUA UNIV
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