本文關(guān)鍵詞： 煤炭地下氣化 活性炭測(cè)氡 多重分形 時(shí)間序列 相關(guān)性　出處：《太原理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：煤炭地下氣化(UCG)是綜合性的能源生產(chǎn)技術(shù)，可將賦存的不可采和不經(jīng)濟(jì)煤炭資源氣化成煤氣（CH4、CO等），輸送到地面供生產(chǎn)生活使用。隨著我國(guó)能源結(jié)構(gòu)的變化，煤炭地下氣化相對(duì)以往煤炭開采利用方式在環(huán)境效益、資源充分利用率、企業(yè)經(jīng)濟(jì)效益、施工人員安全性等方面優(yōu)勢(shì)明顯。目前我國(guó)地下氣化歷經(jīng)30多年發(fā)展，已經(jīng)逐步由實(shí)驗(yàn)室研究朝著工業(yè)生產(chǎn)應(yīng)用方向發(fā)展，然而相對(duì)于地面煤氣化過(guò)程，地下煤氣化過(guò)程中諸多變量的控制和地下爐燃燒狀態(tài)的監(jiān)測(cè)難以達(dá)到有效控制程度。 本文以新奧氣化采煤技術(shù)有限公司申報(bào)的國(guó)家“863”計(jì)劃重大研究課題子課題“氣化工作面的綜合探測(cè)技術(shù)”為基礎(chǔ)，在煤炭氣化試驗(yàn)區(qū)應(yīng)用放射性測(cè)氡法監(jiān)測(cè)煤炭地下氣化過(guò)程中的燃燒狀態(tài)。運(yùn)用多重分形理論方法對(duì)氣化試驗(yàn)區(qū)氡濃度從時(shí)間序列上分析研究了其分布的多重分形特征，研究表明氣化區(qū)氡濃度分布具有明顯的多重分形特征，多重分形參數(shù)與氣化區(qū)溫度呈反相關(guān)的關(guān)系。 地表淺部氡濃度隨外界因素（氣壓、氣溫、濕度）變化而改變，而地表介質(zhì)種類的不同也是影響氡濃度分布變化的因素，在此基礎(chǔ)上在烏蘭察布自然狀態(tài)下的試驗(yàn)區(qū)上開展了不同介質(zhì)不同深度氡濃度分布的多重分形特征研究，從多重分形角度給出了土壤區(qū)和玄武巖區(qū)活性炭測(cè)氡的最佳取樣深度，研究表明不同介質(zhì)的氡濃度分布具有明顯的多重分形特征，土壤區(qū)和玄武巖區(qū)多重分形譜寬度α變化不大，由曲線譜寬度α與曲線α對(duì)稱可知，，兩種介質(zhì)淺部30cm~40cm深度對(duì)稱性較好，土壤區(qū)以40cm氡濃度的對(duì)稱性最好，氡濃度分布相對(duì)穩(wěn)定；玄武巖區(qū)30cm氡濃度對(duì)稱性最好，氡濃度分布相對(duì)穩(wěn)定。從多重分形特征上來(lái)看，在玄武巖區(qū)和土壤區(qū)野外測(cè)氡時(shí)吸附裝置的理想埋深深度應(yīng)在30cm~40cm之間，其中土壤區(qū)以40cm效果最佳，而玄武巖區(qū)以30cm深度較好。在確定合理取樣深度基礎(chǔ)上，野外開展工作時(shí)，可以科學(xué)合理指導(dǎo)野外實(shí)地工作。 運(yùn)用多重分形方法研究烏蘭察布低射氣地區(qū)及氣化區(qū)氡濃度分布的多重分形特征，可以在實(shí)際工作時(shí)確定合理的取樣深度，為氣化區(qū)燃燒狀態(tài)的監(jiān)測(cè)提供一種全新的方法。
[Abstract]:The underground coal gasification (UCGG) is a comprehensive energy production technology, which can gasify the unrecoverable and uneconomical coal resources into coal gas, Ch _ 4CO, etc., which can be transported to the ground for production and daily use. With the change of energy structure in China, The underground gasification of coal has obvious advantages in the aspects of environmental benefit, full utilization of resources, economic benefit of enterprises and safety of construction personnel compared with the previous ways of coal mining and utilization. At present, underground gasification in China has been developing for more than 30 years. It has been gradually developed from laboratory research to industrial application. However, compared with the surface coal gasification process, the control of many variables in underground coal gasification process and the monitoring of combustion state in underground coal gasification process are difficult to achieve effective control level. This paper is based on the national "863" project, "Comprehensive Detection Technology of Gasification face", which has been declared by Xinao Gasification Coal Mining Technology Co., Ltd. In the coal gasification test area, the radioactivity radon method is used to monitor the combustion state in the coal underground gasification process. The multifractal distribution of radon concentration in the coal gasification test area is analyzed from the time series by using the multifractal theory. The results show that the radon concentration distribution in gasified area has obvious multifractal characteristics, and the multifractal parameters are inversely correlated with the temperature of gasification area. The concentration of radon changes with the change of external factors (air pressure, air temperature, humidity), and the variety of surface media is also the factor that affects the distribution of radon concentration. On the basis of this, the multifractal characteristics of radon concentration distribution in different media and different depth are studied in the experimental area under the natural condition of Wulanchabu. The optimum sampling depth of radon measurement by activated carbon in soil area and basalt area is given from the point of view of multifractal. The results show that the distribution of radon concentration in different media has obvious multifractal characteristics, and the multifractal spectrum width 偽 in soil and basalt areas has little change. The depth symmetry of the two media is good, the symmetry of radon concentration is the best in the soil area, the distribution of radon concentration is relatively stable, the symmetry of radon concentration is the best in the basalt area, and the radon concentration distribution is relatively stable in the basalt area. The ideal depth of the adsorption device for radon measurement in basalt and soil areas should be between 30 cm and 40 cm, of which 40cm in soil area is the best, and 30cm depth in basalt area is better. On the basis of determining reasonable sampling depth, the optimum depth for field work is 40 cm. The field work can be guided scientifically and reasonably. The multifractal method is used to study the multifractal characteristics of radon concentration distribution in low emission gas area and gasification area of Wulanchabu. The reasonable sampling depth can be determined in practical work, which provides a new method for monitoring combustion state in gasification area.
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD84;P631.6

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