System and method for detecting content of sulfur trioxide in flue gas

A sulfur trioxide and detection method technology, applied in chemical method analysis, measuring device, color/spectral characteristic measurement, etc., to achieve the effect of easy on-site operation, avoiding interference, and simple method

Pending Publication Date: 2020-01-14
李朋
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent No. 201410340268.X discloses a method and system for measuring sulfur dioxide and sulfur trioxide in flue gas, but it is not clear which method is used to test SO in solution 4 2- ion concentration

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  • System and method for detecting content of sulfur trioxide in flue gas
  • System and method for detecting content of sulfur trioxide in flue gas
  • System and method for detecting content of sulfur trioxide in flue gas

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Embodiment 1

[0108] Such as figure 1 As shown, this embodiment provides a detection system for sulfur trioxide content in flue gas, including: a flue gas extraction unit 10 , a solution preparation unit 20 , a titration unit 30 and a data processing module 40 .

[0109] Before detecting the sulfur trioxide in the flue gas, this embodiment first determines the wavelength of the required photometric electrode, and the specific methods include:

[0110] 1. Color reaction:

[0111] (1) Add 0, 0.1, 0.2, 0.4, 0.6, 0.8, 1.0 mL of 0.01 mol / L barium ion solution to a 25 mL colorimetric tube respectively.

[0112] (2) Add 0.2 mL of 2 mg / mL thorium reagent aqueous solution, and dilute to 25 mL with 80% isopropanol.

[0113] (3) After mixing the solution evenly, let it stand for 15 minutes to obtain a series of different concentrations of Ba 2+ Standard solution samples.

[0114] 2. Use the purple light spectrophotometer to select the characteristic wavelength:

[0115] (1) Use 80% isopropanol so...

Embodiment 2

[0127] This embodiment is basically the same as Embodiment 1, the only difference is that the online detection system also includes a control unit, and the control unit realizes the control of each unit by controlling the opening and closing of other unit pumps.

[0128] The test result of this embodiment is 4.9mg / m 3 .

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Abstract

The invention provides a system and a method for detecting a content of sulfur trioxide in a flue gas, and belongs to the sulfur trioxide detection technology field. By using the method, a time pointwhen a second derivative of an absorbance and a titrating solution volume function is zero is used as a judgment end point. An interference of a complex component in the flue gas on absorbance can beeffectively avoided, and a large deviation caused when a concentration of sulfur trioxide is determined according to a linear relation between the absorbance or conductivity and a characteristic absorption peak of a sulfur trioxide compound due to complex chemical components of the flue gas is avoided.

Description

technical field [0001] The invention relates to the technical field of sulfur trioxide detection, and in particular provides an online detection system and detection method for sulfur trioxide content in flue gas. Background technique [0002] With the full implementation of the "ultra-low emission" transformation of coal-fired power plants in my country, and the implementation of GB13223-2011 "Emission Standards of Air Pollutants for Thermal Power Plants", the detection and control of pollutants in the flue gas of thermal power plants has received increasing attention. SO in flue gas of thermal power plant 3 It can significantly increase the acid dew point temperature in the flue gas and aggravate the corrosion in low temperature areas. Additionally, SO 3 It condenses with the water vapor in the flue gas to form sulfuric acid mist, and can also form viscous NH with escaped ammonia 4 SO 4 , It is more harmful to the air preheater and the tail flue. Therefore, fast and a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N31/16
CPCG01N21/33G01N31/162
Inventor 吴华成康玺李朋周卫青
Owner 李朋
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