重力熱管提取儲(chǔ)煤堆自燃熱量的實(shí)驗(yàn)研究

1、論文題目：重力熱管提取儲(chǔ)煤堆自燃熱量的實(shí)驗(yàn)研究專業(yè)：供熱、供燃?xì)?、通風(fēng)及空調(diào)工程碩士生：屈銳（簽名）指導(dǎo)教師：姬長發(fā)（簽名）薛韓玲（簽名）摘要在煤碳的開采和運(yùn)輸過程中，都涉及到煤的儲(chǔ)存堆放問題。在堆放過程中，煤中的碳分子與周圍氧分子會(huì)發(fā)生緩慢的氧化放熱反應(yīng)，釋放的熱量如不能及時(shí)散發(fā)出去，煤垛溫度就會(huì)升高，甚至引起煤堆自燃，且會(huì)使煤質(zhì)降低，造成巨大的資源損失和環(huán)境污染。目前對(duì)煤堆自燃所采用的方法主要有傳統(tǒng)的打密眼和澆水的方法，這主要是煤中

2、水分受熱汽化吸收了汽化潛熱，借助孔眼的“煙囪效應(yīng)”將熱量散發(fā)出去，起到降溫的作用。但這種方法受煤中含水分的影響，一方面水分以水蒸氣形式離開煤垛帶走汽化潛熱，另一方面水分逸出將會(huì)增大煤與空氣的接觸面積，從而加快氧化產(chǎn)生熱量如果能及時(shí)移除煤堆內(nèi)部的熱量，就可以有效避免煤堆自燃。重力熱管已經(jīng)在電子元件冷卻、余熱回收等方面顯示了高效的導(dǎo)熱技術(shù)，在此嘗試把重力熱管應(yīng)用于移除煤堆內(nèi)部的自燃熱量，利用重力熱管對(duì)煤火非控燃燒熱量進(jìn)行提取，既能達(dá)到煤火防

3、止的目的，又能充分利用能源，有利于防止地下煤火蔓延擴(kuò)展或防止火區(qū)復(fù)燃。熱管所提取的熱量亦可進(jìn)行余熱的二次利用。本文嘗試?yán)脤?shí)驗(yàn)的手段進(jìn)行了熱管提取煤堆熱量的實(shí)驗(yàn)，通過測試儲(chǔ)煤堆內(nèi)部溫度場的變化，進(jìn)行了熱管換熱性能的對(duì)比試驗(yàn)。對(duì)比了不插熱管和插入熱管后的降溫效果，插入熱管后，通過改變重力熱管的布置間距、插入深度、傾斜角度和冷凝段散熱方式對(duì)比了煤堆的降溫效果。結(jié)果表明煤垛中插入熱管后可以明顯的降低煤垛內(nèi)的溫度，當(dāng)插入多根光管時(shí)，熱管間的間距

4、縮小、插入深度減小、熱管布置角度減小時(shí)可以有效提高煤堆的散熱，當(dāng)煤堆內(nèi)部溫度升高時(shí)，冷凝段加裝翅片的熱管降溫效果更好，熱管可有效防治煤堆的自燃和煤田火災(zāi)。本文的研究思路為煤火自燃熱量的提取和利用提供了新思路。關(guān)鍵詞：熱管；煤自燃；熱性能；儲(chǔ)煤堆研究類型：應(yīng)用研究萬方數(shù)據(jù)SubjectSubjectSubjectSubject::::ExperimentalExperimentalExperimentalExperimentalResea

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