【正文】 thane is discharged each yeah in China, 80 percent of the coal mine methane is of ultralow concentration, which has the quality of huge volume, low concentration and it fluctuate strongly in amount and concentration. So most of methane is discharged without any treatment, as a result, environment pollution and energy waste is increasingly serious. So it is of vital importance to study new technology dealing with ultralow concentration methane. The characteristic of a latemodel preheat catalytic oxidation device was experimentally studied in this paper. Before that, some improvements and new design were done to keep the device selfrunning. Then lots of experiments were done to study the performance of the device, the contents are as follows: (1)The study of starting performance shows that, with the increase of flow rate, the heating rate decrease, and the temperature of oxidation bed is more even。 the best coefficient of flow rate is between and , the lowest starting power is , and the optimum starting power is times of the lowest starting power. (2) The study of oxidizing performance shows that, with the increase of flow rate, the temperature in oxidation bed and the conversion rate of methane increase slowly then decreases rapidly, the efficiency of energy recovering decreases rapidly, and the temperature of exhaust gas increases slightly。 with the increase of temperature of oxidation bed entrance, the temperature in oxidation bed and the conversion rate of methane increase, the efficiency of energy recovering increases, and the temperature of exhaust gas increases to some extent. (3) The study of resistance characteristics shows that, resistance loss in each part increases with the increase of flow rate, but the pattern are different: the resistance loss in preheater increase quadratic, the resistance loss in oxidation bed increase linearly。 empirical formula of the device was got on the basic of lots experiments. Key word: coal mine ventilation air methane, preheat catalytic oxidation, starting performance, resistance characteristic. 山東理工大學碩士學位論文 目錄 IV 目錄 摘要 ................................................................................................................................ I Abstract.......................................................................................................................... II 目錄 ............................................................................................................................. IV 第一章 緒論 ................................................................................................................. 1 選題背景和意義 ............................................................................................. 1 國內(nèi)外研究現(xiàn)狀 ............................................................................................. 2 輔助燃 料 ............................................................................................... 2 主要燃料 ............................................................................................... 3 本課題研究內(nèi)容 ............................................................................................. 8 第二章 煤礦乏風瓦斯預熱催化氧化裝置試驗系統(tǒng) ................................................. 9 煤礦乏風瓦斯預熱催化氧化裝置 系統(tǒng)組成 ................................................. 9 供氣系統(tǒng) ............................................................................................... 9 預熱系統(tǒng) ............................................................................................. 12 加熱起動系統(tǒng) ..................................................................................... 13 催化氧化反應室 ................................................................................. 14 排氣系統(tǒng) ............................................................................................. 15 控制系統(tǒng) ............................................................................................. 15 煤礦乏風瓦斯預熱催化氧化裝置 工作原理 ............................................... 15 煤礦乏風預熱催化氧化裝置改造 ............................................................... 16 能量計算方法 ..................................................................................... 16 改造前裝置能量計算結(jié)果分析 ......................................................... 17 改進設計方案 ..................................................................................... 18 改造后裝置運行效果 ......................................................................... 20 試驗參數(shù) ....................................................................................................... 21 本章小結(jié) ....................................................................................................... 22 第三章 煤礦乏風瓦斯預熱催化氧化裝置起動特性試驗研究 ............................... 23 試驗條件下的甲烷起燃溫度 ....................................................................... 23 流量比例系數(shù)對裝置起動性能的影響 ....................................................... 23 流量比例系數(shù)對升溫速率的影響 ..................................................... 24 流量比例系數(shù)對溫度不均勻系數(shù)的影響 ......................................... 25 山東理工大學碩士學位論文 目錄 V 起動功率對裝置起動性能的影響 ............................................................... 25 起動功率對升溫速率的影響 ............................................................. 26 起動功率對截面溫度均勻性的影響 ................................................. 27 最佳起動工況 ............................................................................................... 27 本章小結(jié) ....................................................................................................... 29 第四章 煤礦乏風瓦斯預熱催化氧化裝置氧化性能試驗研究 ............................... 30 空速對裝置運行情況的影響 ....................................................................... 30 空速對氧化床溫度分布的影響 ...........................................