Method for detecting content of nitrogen in denitrified fly ash
A detection method and technology for fly ash, which are applied in the direction of analysis by chemical reaction of materials and material analysis by observing the influence on chemical indicators, can solve the problems of high chemical composition, cumbersome, denitrification fly ash disposal and other problems. Problems such as unfavorable comprehensive utilization
Inactive Publication Date: 2014-04-09
SHANGHAI RES INST OF BUILDING SCI CO LTD
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[0003] With the mandatory implementation of power denitrification, traditional fly ash will all become denitrification fly ash. Affected by the denitrification process, denitrification agents (urea, ammonia, etc.) The chemical components such as ammonium salt in coal ash are high, which will have an adverse impact on the disposal and comprehensive utilization of denitrification fly ash
However, no systematic research has been carried out on denitrification fly ash in China at present. In terms of the detection of nitrogen elements in denitrification fly ash, the sensitivity of the element analyzer is not high among the existing detection methods, and the Kjeldahl nitrogen method is relatively cumbersome, which cannot meet the requirements. In order to meet the needs of large-scale promotion and application of denitrification fly ash and safety assurance, it is urgent to establish a scientific and effective detection method and corresponding standard for the nitrogen content of denitrification fly ash
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[0021] The embodiments of the present invention will be described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation manners and specific operation procedures are given, but the protection scope of the present invention is not limited to the following embodiments.
[0022] 1. Four samples of denitrified fly ash were taken from different coal-fired power plants in Shanghai, and 1.000 g of denitrified fly ash samples were weighed under natural drying.
[0023] 2. Reagent preparation:
[0024] Methyl red-bromocresol green indicator: Weigh 0.3g bromocresol green and 0.2g methyl red, and dissolve them in 100mL 95% volume concentration ethanol;
[0025] 2% boric acid absorption solution: weigh 2g boric acid and dissolve it in 1L deionized water;
[0026] 40% sodium hydroxide solution: weigh 40g of sodium hydroxide and dissolve it in 1L of deionized water;
[0027] 0.02mol / L hydrochloric acid standard so...
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The invention discloses a method for detecting the content of nitrogen in denitrified fly ash. The method comprises the following steps: distilling ammonium nitrogen of denitrified fly ash in a strong alkaline solution, titrating by adopting a hydrochloric acid solution, and calculating to obtain the content of nitrogen in the denitrified fly ash. The method for detecting the content of nitrogen in denitrified fly ash is made against the new solid wastes like the denitrified fly ash with the specific existing form of nitrogen as a starting point, is rapid and sensitive, fills a gap in the above performance index detection method of the denitrified fly ash, and can be widely used for the performance evaluation and quality control of the denitrified fly ash by coal-fired power plants and third party detection mechanisms.
Description
Technical field [0001] The invention belongs to the technical field of building material detection, and specifically relates to a method for detecting nitrogen content of denitrified fly ash. Background technique [0002] Serious air pollution, NO X Emission reduction has become a consensus for the development of the power industry and is an important part of my country's "Twelfth Five-Year Plan" work. "The Twelfth Five-Year Plan for Energy Conservation and Emission Reduction" (Guo Fa [2012] No. 40), and the "Twelfth Five-Year Plan for Energy Conservation and Emission Reduction" (Guo Fa [2011] No. 26) During the period, "the construction of denitration facilities for 400 million kilowatts of coal-fired units in service has been completed, and the low-nitrogen combustion technology transformation of 70 million kilowatts of coal-fired units has been implemented, and the denitrification efficiency has reached more than 75%." It is expected that "the emission of nitrogen oxides in t...
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Inventor 王琼杨利香林茂松
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD