Multi-state sampling system and multi-state test method for sulfur trioxide in exhaust gas from stationary pollution sources

A fixed pollution source and sulfur trioxide technology, applied in the field of pollutant detection, can solve the problems of large deviation and inability to distinguish the form of exhaust gas, etc., and achieve the effect of accurate measurement results and low escape rate
CN103439152BActive Publication Date: 2015-08-12SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SHANGHAI MINGHUA ELECTRIC POWER TECH & ENG
Publication Date
2015-08-12

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Abstract

The invention discloses a polymorphic sampling system and method for sulfur trioxide in exhaust of a stationary pollution source. The polymorphic sampling method comprises the following steps: according to the form of SO3 in the exhaust, based on a selective condensation principle, collecting aerosol-state SO3 in the exhaust by adopting a front-stage collector under the temperature of the exhaust; and enabling the temperature of the exhaust flowing in a rear-stage collector to be reduced below an acid dew point through a water bath or water bath circulation so that the original gaseous SO3 under the temperature of the exhaust is transformed into the aerosol-state SO3 to be deposited in the rear-stage collector so as to realize the purpose that the aerosol-state SO3 and the gaseous SO3 are respectively measured. According to the scheme provided by the invention, the aerosol-state SO3 and the gaseous SO3 in the exhaust can be distinguished, and respectively quantified; a proportion of the aerosol-state SO3 to the gaseous SO3 is calculated, and the total concentration of the SO3 can also be measured. The measured concentration of the aerosol-state SO3 and the gaseous SO3 under the temperature of the exhaust provides basic data for researching acid corrosion at the tail of a boiler; meanwhile, the polymorphic sampling system can be applied to detection of SO3 emission concentration of exhaust of other pollution sources.
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Description

technical field

[0001] The invention relates to pollutant detection technology, in particular to the detection technology of sulfur trioxide in exhaust gas from fixed pollution sources. Background technique

[0002] SO in the exhaust of stationary pollution sources 3 The test is an important item for the detection and evaluation of pollutant emissions, as well as the corrosion status of the boiler tail and the evaluation of the acid dew point. In particular, the recent use of waste heat utilization equipment for flue gas from coal-fired boilers has promoted SO 3 testing needs.

[0003] US EPA Method8 adopts selective dissolution and absorption method to absorb SO with 80% isopropanol aqueous solution 3 / H 2 SO 4 , with 3% H 2 o 2 Absorb SO 2 . The disadvantage of this method is that the particulate matter is not removed, so that SO 3 The detection value is positive deviation. US NCASI (National Council of the Paper Industry for Air and Stream Improvement, Inc.) Me...

Claims

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