Method and device for measuring SOx in fire coal fume

A coal-burning flue gas and testing method technology, which is applied in the direction of measuring devices, sampling devices, and test sample preparation, can solve problems such as temperature inconsistency, easy deposition, and low SO3 concentration, so as to avoid secondary reactions and reduce errors , the effect of high measurement accuracy

Active Publication Date: 2012-11-14
SOUTHEAST UNIV
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Problems solved by technology

[0004] At present, the sampling and testing method of SO3 is mainly the controlled condensation method, which has two problems in operation. 1) Since the temperature of the sampling pipe is generally set above 260°C, which is inconsistent with the temperature in the actual sampling flue, SO 2 and O 2 , SO3 and fly ash inevitably r

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  • Method and device for measuring SOx in fire coal fume

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Embodiment Construction

[0013] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. After reading the present invention, those skilled in the art all fall into the appended claims of the present application to the amendments of various equivalent forms of the present invention limited range.

[0014] Such as figure 1 As shown, a detection device for SOx in coal-fired flue gas includes an isothermal and constant velocity sampling system, a condensation temperature control system, a flue gas absorption system and a flue gas flow control system connected in sequence through pipelines, wherein:

[0015] The isothermal and isokinetic sampling system includes a quartz sampling tube 2 with a heater on the outer surface, a cyclone separator, an incubator 5 and a temperature c...

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Abstract

The invention discloses a method and a device for measuring SOx in fire coal fume. The method comprises the following steps of: a. sampling fire coal fumes, wherein the temperature for sampling is kept the same as that of the fire coal fume in a flue during the process; b. cooling by using a condenser and absorbing SO3 in the fumes, wherein the temperature is controlled within 75-85 DEG C during the process; c. carrying out the oxidation absorption on the fumes, eliminating the moisture in the fumes, and simultaneously controlling to ensure a stable fume flow; and d. respectively detecting the content of SO3 absorbed by the condenser during the cooling and the content of SO2 after the oxidation absorption. According to the method, the temperature while the fume is sampled is kept the same as that in the fume constantly, so the secondary reaction of SO3 is avoided; and meanwhile the fly ash in the fume is isolated, and the accuracy of the flow, temperature and pressure for the fume sampling can be ensured; and moreover a high precision iron chromatography method is adopted for the measurement, so that the method is higher in measuring precision, and the error is reduced.

Description

[0001] technical field [0002] The invention belongs to the technical field of energy saving and environmental protection engineering, and in particular relates to a method and a device for testing SOx in coal-fired flue gas. Background technique [0003] Currently thermal power plant SO 2 A large amount of emissions have caused serious air pollution and acid rain problems. Although the emission of SO3 is very small, SO3 is easily combined with water vapor in the flue gas to form sulfuric acid vapor, which condenses on the heating surface whose wall temperature is lower than the acid dew point, causing acid dew point corrosion. The more SO3 content in the flue gas, the higher the acid dew point temperature, and the wider and more serious the corrosion range. At the same time, the corrosion problem also seriously restricts the recovery of low-temperature waste heat. The sampling test of SOx is of great significance to the understanding of acid corrosion and the developmen...

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Application Information

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IPC IPC(8): G01N30/02G01N30/14G01N1/22G01N1/34
Inventor 段伦博段钰锋赵长遂陈晓平桑圣欢王卉
Owner SOUTHEAST UNIV
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