【摘要】：我國(guó)低階煤儲(chǔ)量豐富,但由于低階煤變質(zhì)程度低、含水率較高,加之其易自燃、難運(yùn)儲(chǔ)等原因,致使其工業(yè)利用價(jià)值受到很大局限,所以,基于低階煤的特性,采用物理方法對(duì)其進(jìn)行干燥提質(zhì),實(shí)現(xiàn)其發(fā)熱量的較大幅度提高,從而提升了煤炭資源利用率。在現(xiàn)階段煤炭物理干燥提質(zhì)技術(shù)中,滾筒干燥技術(shù)已經(jīng)較為成熟,并廣泛應(yīng)用于高階煤的物理干燥提質(zhì)。但對(duì)于低階煤,由于滾筒干燥過(guò)程中煤塵產(chǎn)生量大,當(dāng)煤塵達(dá)到爆炸極限濃度、引風(fēng)裝置將燃燒器內(nèi)高溫?zé)煔鈸诫s引火火源引入滾筒、滾筒內(nèi)熱煙氣中氧氣含量充足三個(gè)條件同時(shí)具備時(shí),就必然發(fā)生煤塵的爆燃爆炸。雖經(jīng)實(shí)驗(yàn)室以及工程實(shí)踐數(shù)次試驗(yàn),但均不能實(shí)現(xiàn)大幅度降低煤塵以及絕對(duì)消除高溫?zé)煔庵械幕鹦?所以,研究有效控制滾筒內(nèi)氧氣濃度在安全范圍之內(nèi),是實(shí)現(xiàn)系統(tǒng)煤塵抑爆的關(guān)鍵。依據(jù)煤塵災(zāi)害發(fā)生機(jī)理,在分析研究低階煤理化性質(zhì)、滾筒干燥提質(zhì)系統(tǒng)工藝及其裝配基礎(chǔ)上,利用流體力學(xué)軟件Fluent及相關(guān)理論,對(duì)滾筒干燥機(jī)內(nèi)不同入口煙氣溫度下滾筒干燥機(jī)內(nèi)氧氣濃度及降水率的動(dòng)態(tài)變化進(jìn)行模擬研究,獲得了高溫?zé)煔鉁囟取⒔邓逝c滾筒內(nèi)氧含量之間的關(guān)系及其變化規(guī)律;研發(fā)了基于負(fù)氧熱煙氣可控循環(huán)利用系統(tǒng)。工程實(shí)踐中,基于干燥物料的特性,附以滾筒干燥機(jī)內(nèi)部結(jié)構(gòu)的調(diào)整以及系統(tǒng)運(yùn)行參數(shù)的優(yōu)化,可實(shí)現(xiàn)有效控制滾筒內(nèi)氧氣濃度、抑制煤塵的爆炸。
[Abstract]:China is rich in low-rank coal reserves, but because of its low metamorphism, high water content, easy spontaneous combustion, difficult to transport and storage and other reasons, its industrial utilization value is greatly limited, so, based on the characteristics of low-rank coal, The physical method is used to dry and improve the quality, so that the calorific value of the coal resource can be greatly improved, and the utilization rate of coal resources can be improved. At present, the drum drying technology has been more mature in the physical drying and quality improvement technology of coal, and is widely used in the physical drying of high-grade coal. However, for low-order coal, because of the large amount of coal dust produced in the drying process of the drum, when the coal dust reaches the explosion limit concentration, the air entraining device introduces the high temperature flue gas doping ignition source in the burner into the drum. When the oxygen content in the hot flue gas is sufficient at the same time, the deflagration explosion of coal dust will inevitably occur. Although it has been tested several times in laboratory and engineering practice, it can not greatly reduce coal dust and absolutely eliminate Mars in high temperature flue gas. Therefore, the effective control of oxygen concentration in drum is within a safe range. It is the key to realize the explosion suppression of coal dust in the system. According to the occurrence mechanism of coal dust disaster, on the basis of analyzing and studying the physical and chemical properties of low rank coal, the technology of drum drying and quality improvement system and its assembly, the hydrodynamics software Fluent and related theories are used. The dynamic changes of oxygen concentration and water reduction rate in drum dryer at different inlet flue gas temperatures were simulated and studied, and the relationship between high temperature flue gas temperature, water reduction rate and oxygen content in drum was obtained. A controllable recycling system based on negative oxygen heat flue gas is developed. In engineering practice, based on the characteristics of dry materials, with the adjustment of the internal structure of the drum dryer and the optimization of the operating parameters of the system, the oxygen concentration in the drum can be effectively controlled and the explosion of coal dust can be suppressed.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD714.5

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 周琦;;低階煤提質(zhì)技術(shù)現(xiàn)狀及完善途徑[J];潔凈煤技術(shù);2016年02期

2 吳曉華;宋二波;賈尚偉;;基于SWOT分析的我國(guó)潔凈煤技術(shù)發(fā)展研究[J];潔凈煤技術(shù);2015年01期

3 趙鵬;李文博;梁江朋;谷小會(huì);;低階煤提質(zhì)技術(shù)現(xiàn)狀及發(fā)展建議[J];潔凈煤技術(shù);2015年01期

4 徐鑫;熊志軍;;國(guó)內(nèi)外煤炭提質(zhì)技術(shù)應(yīng)用現(xiàn)狀[J];中國(guó)煤炭;2013年12期

5 紀(jì)磊;張安明;田勇;;振動(dòng)床逆流低溫富氧褐煤干燥系統(tǒng)煤粉著火爆炸危險(xiǎn)性分析及其控制技術(shù)[J];礦業(yè)安全與環(huán)保;2013年06期

6 李振;于偉;楊超;周安寧;;低階煤提質(zhì)利用現(xiàn)狀及展望[J];礦山機(jī)械;2013年07期

7 曾凡虎;陳鋼;李澤海;黃學(xué)群;;我國(guó)低階煤熱解提質(zhì)技術(shù)進(jìn)展[J];化肥設(shè)計(jì);2013年02期

8 朱川;楊曉毓;邵徇;;低階煤干燥脫水技術(shù)的研究[J];潔凈煤技術(shù);2013年01期

9 劉思明;;低階煤熱解提質(zhì)技術(shù)發(fā)展現(xiàn)狀及趨勢(shì)研究[J];化學(xué)工業(yè);2013年01期

10 王春蓮;;煤塵爆炸產(chǎn)生的機(jī)理及特征研究[J];煤炭技術(shù);2012年11期

相關(guān)博士學(xué)位論文 前2條

1 王秋林;過(guò)熱蒸汽煤干燥與清潔燃燒關(guān)聯(lián)性分析及評(píng)價(jià)方法研究[D];天津大學(xué);2014年

2 王鶴;提質(zhì)低階煤型煤防水性能及技術(shù)研究[D];中國(guó)礦業(yè)大學(xué)（北京）;2011年

相關(guān)碩士學(xué)位論文 前9條

1 肖峗;滾筒式蒸汽干燥機(jī)與其旋轉(zhuǎn)接頭的流場(chǎng)數(shù)值模擬[D];湘潭大學(xué);2015年

2 姚連升;褐煤微波干燥及水分遷移特性試驗(yàn)研究[D];山東大學(xué);2015年

3 李小艷;褐煤管式氣流干燥流場(chǎng)的數(shù)值模擬研究及干燥管結(jié)構(gòu)優(yōu)化[D];遼寧工程技術(shù)大學(xué);2012年

4 楊雪;單通道滾筒干燥機(jī)內(nèi)溫度場(chǎng)和流場(chǎng)數(shù)值模擬[D];東北大學(xué);2011年

5 王飛;內(nèi)熱式蒸汽回轉(zhuǎn)干燥機(jī)內(nèi)流場(chǎng)溫度場(chǎng)數(shù)值模擬[D];東北大學(xué);2011年

6 盧，

本文編號(hào)：2478250