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Continuous online detection method and device for sulfur trioxide in flue gas

A technology of sulfur trioxide and a detection method, which is applied in the field of air pollutant measurement, can solve problems such as high quantitative separation requirements, and achieve the effect of simple measurement method, not easy to condense, and stable chemical properties

Pending Publication Date: 2017-12-26
WUHAN KAIDI ELECTRIC POWER ENVIRONMENTAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the sampling time of a condensing device is generally more than 3 minutes, this application is similar to US8021617, and it still belongs to semi-online continuous measurement, and the measurement cycle is not less than 3 minutes
[0009] The US invention patent application number US8368896 discloses Measurement of sulfur trioxidevia spectroscopy, using SO 3 The difference between the light absorption wavelength and other gas components, the laser absorption spectrum of the flue gas component is measured, and the SO is determined by quantitative analysis of the spectrum. 3 Concentration values ​​that can achieve SO 3 Continuous online measurement, but due to SO 2 with SO 3 There is a certain overlap in the absorption spectrum of SO, and it is difficult to avoid the high concentration of SO 2 to SO 3 Measurement interference, and water vapor and fly ash also have a significant impact on laser absorption, so this technology has high requirements for the actual measurement environment and quantitative separation of spectra, and has certain technical limitations

Method used

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  • Continuous online detection method and device for sulfur trioxide in flue gas
  • Continuous online detection method and device for sulfur trioxide in flue gas

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Embodiment 1

[0060] Solid salt particle is NaCl, and the present invention comprises the following steps:

[0061] S1. Put about 20g of NaCl particles in a fluidized bed reactor. The fluidized bed reactor has a diameter of 40mm and a height of 160mm. The fluidized bed reactor is made of quartz material to ensure that the reactor itself does not interfere with the gas in the flue gas. Component reaction, the fluidized bed reactor is equipped with two sieve trays;

[0062] S2, heating the fluidized bed reactor to 400°C through a heating furnace;

[0063] S3. The sampling pipe is connected to the flue to collect the flue gas to be tested. The sampling pipe divides the sampling flue gas into two paths, which enter the first channel and the second channel respectively. The flue gas in the first channel directly flows into the first flue gas. Measure raw flue gas HCl concentration n in the analyzer 1 , the measurement accuracy is 0.1ppm, the flue gas in the second channel is passed into the fl...

Embodiment 2

[0069] Solid salt particle is FeS, and the present invention comprises the following steps:

[0070] S1. Put about 40g of FeS particles in a fluidized bed reactor with a diameter of 40mm and a height of 160mm. The fluidized bed reactor is made of quartz material, and the fluidized bed reactor is equipped with two sieve plates;

[0071] S2, heating the fluidized bed reactor to 300°C through a heating furnace;

[0072] S3. The sampling pipe is connected to the flue to collect the flue gas to be tested. The sampling pipe divides the sampling flue gas into two paths, which enter the first channel and the second channel respectively. The flue gas in the first channel directly flows into the first flue gas. Measure raw flue gas HCl concentration n in the analyzer 3 , the measurement accuracy is 0.1ppm, the flue gas in the second channel is passed into the fluidized bed reactor and then passed into the second flue gas analyzer to measure the HCl concentration n in the flue gas after...

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Abstract

The invention belongs to the technical field of measurement of atmospheric pollutants and discloses a continuous online detection method and device for sulfur trioxide in flue gas. The method comprises the following steps: dividing sampled flue gas in a flue into two ways, directly introducing a first way of the sampled flue gas into a first flue gas analyzer for measuring composition of raw flue gas, introducing a second way of the sampled flue gas into a fluidized bed reactor, carrying out irreversible reaction with solid salt particles placed in the fluidized bed reactor, introducing the flue gas after reaction into a second flue gas analyzer for measuring components of the flue gas after reaction; and calculating concentration of SO3 in the flue gas in a flue in real time by comparing difference between the components of the raw flue gas and the components of the flue gas after reaction as well as equivalent ratio of SO3 in the sampled flue gas with the solid salt particles during reaction. The continuous online detection method and device have the advantages that structure is simple, measurement accuracy is high, and continuous online detection on SO3 in the flue gas can be realized.

Description

technical field [0001] The invention belongs to the technical field of atmospheric pollutant measurement, and in particular relates to a continuous on-line detection method and device for sulfur trioxide in flue gas. Background technique [0002] SO 3 It is one of the main causes of acid rain, because it is easy to form submicron aerosol, and then form secondary sulfate particles, so it is also the PM in the atmosphere 2.5 one of the important sources. Also, SO 3 Will cause flue corrosion, and NH 3 、H 2 O combines to form cohesive NH 4 HSO 4 It will also lead to problems such as SCR deactivation and air preheater blockage. Especially under the policy requirements of ultra-low emissions of coal-fired flue gas in my country, in order to improve NO X The removal efficiency of the flue gas in the SCR becomes longer, further increasing the SO in the SCR 2 to SO 3 conversion rate. Therefore, SO in flue gas 3 Accurate measurement techniques are gaining more and more att...

Claims

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Application Information

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IPC IPC(8): G01N33/00
CPCG01N33/0004
Inventor 陈超韩长民赵红薛菲
Owner WUHAN KAIDI ELECTRIC POWER ENVIRONMENTAL