本文選題：水泥爐窯 + 煙氣脫硝　； 參考：《西安建筑科技大學(xué)》2015年碩士論文

【摘要】：水泥工業(yè)氮氧化物(NO_X)的排放量在全國NO_X的排放中占有較大的比例,是造成大氣污染的主要原因之一。本文分析了水泥工業(yè)NO_X的產(chǎn)生機理,介紹了水泥工業(yè)煙氣脫硝技術(shù)的原理,從技術(shù)成熟度、脫硝效率、工程實施的難易程度、投資運行成本及排放標(biāo)準(zhǔn)等方面對兩種主要脫硝工藝SNCR法和SCR法進行了比較,給出了目前水泥工業(yè)SNCR法進行煙氣脫硝的實用性和技術(shù)優(yōu)勢。本文通過SNCR法使用不同還原劑性能指標(biāo)的比較,給出通常選擇氨水作為還原劑的原因;同時,通過CFD技術(shù),對分解爐內(nèi)煙氣流場和溫度場進行模擬,為還原劑的噴入點的確定提供依據(jù)。提出了SNCR法煙氣脫硝技術(shù)影響脫硝效率的因素,如反應(yīng)溫度、噴點位置、氨氮比(NSR,Normalized Stoichiometric Ratio)、停留時間、氧含量等,通過實際工業(yè)對比試驗,對其影響程度進行了分析,并確定了上述影響因素在目前排放要求下SNCR脫硝設(shè)計和實施中的最佳取值。本文根據(jù)以上研究結(jié)果,結(jié)合兩個實際工程案例,對使用不同還原劑時煙氣脫硝的各項技術(shù)經(jīng)濟指標(biāo)進行對比說明,對脫硝效率的主要設(shè)計參數(shù)進行優(yōu)化,并結(jié)合實際運行參數(shù)對其影響程度通過圖表形式進行了分析,得出不同噴氨量條件下NO_X排放濃度和氨逃逸濃度、不同目標(biāo)排放濃度對應(yīng)的NSR值等,還對SNCR脫硝對水泥生產(chǎn)工藝的影響進行初步分析。給出了工程案例中脫硝系統(tǒng)設(shè)備選型的原則、噴槍安裝注意事項和配置等。同時為保證脫硝系統(tǒng)安全運行,考慮設(shè)置環(huán)境安全噴淋控制裝置以達到控制氨泄漏造成的危害。
[Abstract]:The amount of nitrogen oxide (NOX) in cement industry accounts for a large proportion of NO_X emissions in China, which is one of the main causes of air pollution. This paper analyzes the production mechanism of NO_X in cement industry, introduces the principle of flue gas denitrification technology in cement industry, and introduces the technical maturity, denitrification efficiency and the degree of difficulty in project implementation. Two main denitrification processes, SNCR method and SCR method, are compared in terms of investment operating cost and emission standard. The practicability and technical advantages of SNCR process for flue gas denitrification in cement industry are given. In this paper, the reason why ammonia is usually chosen as reducing agent is given by comparing the performance indexes of different reductants used in SNCR method, and the flow field and temperature field of flue gas in calciner are simulated by CFD technology. It provides the basis for determining the injection point of reducing agent. The factors influencing the denitrification efficiency of flue gas denitrification by SNCR are put forward, such as reaction temperature, injection point location, ammonia to nitrogen ratio, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N, N and N, etc. The optimum value of the above factors in the design and implementation of SNCR denitrification under the current emission requirements is determined. Based on the above research results and two practical engineering cases, this paper compares the technical and economic indexes of flue gas denitrification with different reducing agents, and optimizes the main design parameters of denitrification efficiency. Based on the analysis of actual operation parameters, the NO_X emission concentration and ammonia escape concentration, and the corresponding NSR value of different target emission concentration are obtained. The effect of SNCR denitrification on cement production process was also analyzed. The principle of equipment selection of denitrification system in engineering cases, the matters needing attention in installation and configuration of spray gun are given. In order to ensure the safe operation of denitrification system, environmental safety sprinkler control device is considered to control the harm caused by ammonia leakage.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X781.5

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本文編號：1881276