Method for determining escape ammonia in flue gas of cement plant

Abstract

The invention discloses a method for determining escape ammonia in flue gas of a cement plant. The method comprises the following steps: introducing flue gas of the cement plant into absorption liquid, and performing constant volume treatment with water, thus obtaining to-be-determined solution; preparing standard curve solution; respectively placing the to-be-determined solution and the standardcurve solution into different colorimetric tubes provided with a plug, performing constant volume treatment with water, then sequentially and respectively adding salicylic acid-trisodium citrate solution, sodium nitroprusside solution and sodium hypochlorite solution into the colorimetric tubes provided with the plug and uniformly mixing, then stabilizing the colorimetric tubes provided with the plug for 2-4 hours at the temperature of 30-40 DEG C, and then performing colorimetric determination according to coloring depth, thus obtaining concentration of ammonia in the flue gas of the cement plant. The method disclosed by the invention determines ammonia concentration by utilizing an indophenol blue spectrophotometric method, the help of large-scale analytical instruments and equipment isnot required as the detection analysis method is adopted, and the method is simple, quick and accurate, saves cost, has obvious practicability and is applicable to field laboratory analysis; and detection results are stable, repeatability is good, detection accuracy and precision are improved, and a measurable concentration range of a sample is broadened.

Description

technical field [0001] The invention belongs to the field of testing, and in particular relates to a method for measuring the escape of flue gas ammonia from a cement plant. Background technique [0002] Ammonia is the only alkaline gas in the atmosphere. It is soluble in water and chemically reacts with acidic substances. Such chemical properties enable it to react with sulfur dioxide and nitrogen oxides (NO X ) react to generate secondary particles such as ammonium nitrate and ammonium sulfate. Secondary particulate matter is an important source of PM2.5, which affects air quality and deteriorates the environment. Therefore, the control of ammonia emissions deserves attention. [0003] With the continuous development of my country's cement industry, the problem of fine particles and ozone layer pollution caused by nitrogen oxides is becoming more and more serious, which not only causes serious harm to the environment, but also poses a threat to human physical and mental h...

AI Technical Summary

Problems solved by technology

Although my country's cement plant denitrification technology and process are gradually localized, the technology for measuring ammonia slip is not very mature.

At present, in order to control the emission of nitrogen oxides, the out-of-stock technology of domestic cement plants mainly adopts the SNCR process, but this denitrification technology has not been practiced for a long time, and the experience is insufficient, and the phenomenon of ammonia escape is serious.

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