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Device and method for simultaneously detecting SO2 and SO3 in flue gas

A flue gas and flue gas pipe technology is applied in the field of devices that simultaneously detect SO2 and SO3 in flue gas. Avoid the interference of reducing gas, overcome randomness, and ensure the effect of accuracy

Pending Publication Date: 2021-09-28
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the condensation temperature used is 60-80°C, and this method cannot guarantee the SO in the flue gas. 3 It is completely trapped in the serpentine tube, which is easy to cause analysis errors, and this method is not suitable for lower SO 3 content of flue gas
[0007] In summary, when it comes to analyzing SO in flue gas 2 / SO 3 In terms of content, many patents basically revolve around the characteristics of online analysis, simple structure, process automation, etc., but there is generally a lack of solid SO 2 / SO 3 The theoretical basis of analysis, so for the detection and analysis of SO in flue gas 2 / SO 3 The accuracy of the content is not satisfactory

Method used

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  • Device and method for simultaneously detecting SO2 and SO3 in flue gas
  • Device and method for simultaneously detecting SO2 and SO3 in flue gas
  • Device and method for simultaneously detecting SO2 and SO3 in flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] A catalytic regeneration flue gas temperature is 500 ℃. Before sampling, it is necessary to select a suitable sampling point on the flue gas pipeline, and set a sampling port with a diameter of DN40 at the sampling point, insert the standard gas sampling probe into the flue, and connect it with a flange to collect the flue gas to be tested. N with gas pump 2 Back-purging cleaning pipeline and filter (the filter prevents solid particles in the flue gas from entering the detection system) turns on the heating and preheating sampling flue gas pipeline, and the temperature is set at 380°C.

[0061] Set the gas volume flow meters in the flue gas upstream pipeline 5 and the flue gas downstream pipeline 6 to 300ml / min, which can estimate the amount of SO in the flue gas x Less than 500mg / Nm 3 , add 50.0ml deoxygenated deionized water, 8.0mg hydrogen peroxide (analytical pure), 18.0mgN to the oxidation reactor 7 a OH (analytical pure). Add 50.0ml deoxygenated deionized wate...

Embodiment 2

[0069] Example 2 The flue gas temperature of an economizer is 300°C. Before sampling, it is necessary to select a suitable sampling point on the flue gas pipeline, and set a sampling port with a diameter of DN40 at the sampling point, insert the standard gas sampling probe into the flue, and connect it with a flange to collect the flue gas to be tested. N with gas pump 2 Back purge to clean the pipeline and filter, (the filter prevents solid particles in the flue gas from entering the detection system) Turn on the heating and preheating sampling flue gas pipeline, and set the temperature to 300°C.

[0070] Set the gas volume flowmeters in the flue gas upstream pipeline 5 and the flue gas downstream pipeline 6 to 200ml / min, which can estimate the amount of SO in the flue gas x At 500-1000mg / Nm 3 Range, add 100.0ml deoxygenated deionized water, 16.0mg hydrogen peroxide (analytical pure), 36.0mg NaOH (analytical pure) into the oxidation reactor. Add 100.0ml deoxygenated deioni...

Embodiment 3

[0077] Example 3 The flue gas temperature of a certain chimney is 50°C. Before sampling, it is necessary to select a suitable sampling point on the flue gas pipeline, and set a sampling port with a diameter of DN40 at the sampling point, insert the standard gas sampling probe into the flue, and seal the connection. N with gas pump 2 Back purge cleans the pipeline and filter (the filter prevents solid particles in the flue gas from entering the detection system).

[0078] Turn on the heating and preheating sampling flue gas pipeline, and set the temperature to 50°C. Set the gas volume flow meter in the flue gas upstream pipeline 5 and the flue gas downstream pipeline 6 to 500ml / min, adopt scheme 1, add 50.0ml deoxygenated deionized water, 8.0mg hydrogen peroxide (analytical pure), 18.0mgN a OH (analytical pure). Add 50.0ml deoxygenated deionized water, 10.0mg iodine (analytically pure), 36mgNaOH (analytical pure) and 1d starch solution into the discoloration reactor. Turn ...

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Abstract

The invention provides a device and method for simultaneously detecting SO2 and SO3 in flue gas. The device comprises a sampling system, a reaction system and a chromatographic system, wherein the sampling system comprises a high-temperature-resistant sampling pipe and a flue gas pipeline; the reaction system comprises an oxidation reactor, a color-changing reactor and a corresponding oxidation absorption reaction, the oxidation reactor acts on the flue gas in a flue gas upstream pipeline, and the SOx in the flue gas is converted into SO4 <2-> by adopting the quantitative H2O2, NaOH and deionized water; the color-changing reactor acts on the flue gas in a flue gas downstream pipeline, the content of SO2 in the flue gas is accurately analyzed by adopting an iodometric method, and SOx is converted into SO4 <2->. The method is high in precision, good in repeatability and wide in detection range, the detection range is 0.1 mg / Nm <3> to tens of thousands of mg / Nm <3>, the analysis method overcomes the randomness and contingency of in-situ measurement, the content of SO2 and the content of SO3 in the flue gas can be accurately analyzed at the same time, and the balance relation of SO2 and SO3 in the flue gas can be conveniently investigated.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment, in particular to a method for simultaneously detecting SO in flue gas 2 , SO 3 devices and methods. Background technique [0002] Sulfur oxides produced during the combustion of industrial fossil fuels are mainly SO 2 and a small amount of SO 3 , is a serious pollutant. Taking a coal-fired power plant as an example, the SO in the high-temperature flue gas 2 The content is in hundreds to thousands of ppm, SO 3 The content is about SO 2 0.5-5.0% of content, SO x It is extremely harmful to the human body, is the main cause of acid rain, and is also one of the important sources of atmospheric PM2.5. Current desulfurization methods can effectively remove SO 2 , the removal efficiency can reach 98%, but for SO 3 The removal efficiency is low. [0003] SO 3 It is a non-polar molecule, and it is a colorless transparent oily liquid at room temperature with a strong pungent taste. W...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/96
CPCG01N30/96
Inventor 赵耀王明星董峰邓宝永
Owner CHINA PETROLEUM & CHEM CORP
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