本文選題：甲烷 + 吸附材料��； 參考：《西安科技大學(xué)》2013年碩士論文

【摘要】：我國是一個(gè)煤炭生產(chǎn)大國，煤炭儲(chǔ)量居世界第三。然而，在煤炭開采過程中，礦難事故頻繁發(fā)生，其中瓦斯災(zāi)難事故是危害最大、死亡比例最高的重大事故之一。礦井瓦斯的監(jiān)測與治理一直是煤炭行業(yè)安全管理工作的重中之重。鑒于目前礦井普遍使用的催化燃燒式瓦斯檢測存在零漂及穩(wěn)定性欠佳等缺點(diǎn)，本文提出利用壓電諧振原理設(shè)計(jì)制作甲烷傳感器敏感探頭，以吸附材料作為甲烷氣體的載體，利用壓電振子諧振頻率對(duì)自身重量的敏感性嘗試設(shè)計(jì)制作傳感器敏感探頭，，圍繞該敏感探頭相關(guān)的吸附材料、諧振體設(shè)計(jì)、性能分析等方面做了系統(tǒng)研究，完成了吸附材料的制備與表征、振動(dòng)體的有限元分析及設(shè)計(jì)制作、敏感探頭的加工組裝及其性能分析等工作。 作為同活性炭和沸石相對(duì)比的吸附材料,分別以硝酸鋅、氯化鋅和硫酸鋅為原料，采用低溫水熱法制備出了三種以鋅離子為金屬骨架結(jié)構(gòu)的配合物。對(duì)上述配合物進(jìn)行了XRD、紅外光譜、差熱-熱重及掃描電鏡測試分析。XRD分析結(jié)果表明，制備的三種金屬骨架配合物晶體為單一的純相，不含其他雜質(zhì)，結(jié)合紅外測試結(jié)果推測結(jié)構(gòu)為Zn(NH3)2BDC。差熱-熱重分析表明，三種配合物可以在溫度低于200℃使用，骨架結(jié)構(gòu)不坍塌。通過SEM觀測發(fā)現(xiàn)，以硝酸鋅制備的金屬配合物結(jié)晶效果最好，為針狀晶粒，適用于作甲烷氣體的載體；以氯化鋅、硫酸鋅制備的金屬配合物結(jié)晶為顆粒狀； 以PZT8壓電陶瓷作為激振材料，磷青銅為振動(dòng)本體材料，利用有限元方法進(jìn)行了模態(tài)分析，在分析結(jié)果的基礎(chǔ)上篩選無模態(tài)混疊的模型進(jìn)行三種氣敏探頭設(shè)計(jì)并進(jìn)行加工、組裝與測試。實(shí)際阻抗譜測試結(jié)果表明，有限元分析結(jié)果很好地指導(dǎo)了振動(dòng)體的設(shè)計(jì)，其分析結(jié)果可信； 分別以活性炭、5A型沸石分子篩、MOF金屬有機(jī)骨架配合3種不同的諧振體，構(gòu)成9種傳感器敏感探頭；利用TH2818型自動(dòng)元件分析儀、搭建阻抗頻率特性測試平臺(tái)，在甲烷濃度為0%-7.6%之間分別對(duì)9種傳感器敏感探頭進(jìn)行阻抗頻譜測試。通過對(duì)不同敏感探頭在不同甲烷濃度下的阻抗譜諧振峰偏移量（敏感探頭輸入-輸出曲線）、靈敏度與線性度的對(duì)比分析，表明以5A型沸石分子篩為吸附材料與3#諧振頭搭配得到的探頭對(duì)甲烷濃度有較好的靈敏度和線性，可作為甲烷傳感器敏感探頭。
[Abstract]:Our country is a big country of coal production, coal reserves ranks third in the world. However, in the process of coal mining, mine accidents occur frequently, among which the gas disaster is one of the most harmful and the highest proportion of deaths. Mine gas monitoring and control has been the most important work of coal industry safety management. In view of the shortcomings such as zero drift and poor stability in the catalytic combustion gas detection commonly used in mines at present, this paper presents the design and manufacture of a methane sensor sensitive probe based on piezoelectric resonance principle, in which the adsorbed material is used as the carrier of methane gas. Based on the sensitivity of the resonant frequency of piezoelectric vibrator to its own weight, the sensor sensitive probe is designed and fabricated. The related adsorption materials, resonant body design and performance analysis of the sensor are systematically studied. The preparation and characterization of the adsorption material, the finite element analysis and design of the vibrator, the processing and assembly of the sensitive probe and the performance analysis were completed. As adsorption materials compared with activated carbon and zeolite, zinc nitrate, zinc chloride and zinc sulfate were used as raw materials to prepare three complexes with zinc ion as metal skeleton structure by low temperature hydrothermal method. The results of XRD, IR, DTA, SEM and XRD analysis showed that the crystal of the three metal skeleton complexes was a single pure phase without other impurities. The structure of Zn (NH _ 3) _ 2BDC was deduced from the results of IR. Differential thermogravimetric analysis (DTA) shows that the three complexes can be used at temperatures below 200 鈩

本文編號(hào)：2117641