【摘要】：我國低階煤儲量豐富,但由于低階煤變質(zhì)程度低、含水率較高,加之其易自燃、難運儲等原因,致使其工業(yè)利用價值受到很大局限,所以,基于低階煤的特性,采用物理方法對其進行干燥提質(zhì),實現(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,并廣泛應用于高階煤的物理干燥提質(zhì)。但對于低階煤,由于滾筒干燥過程中煤塵產(chǎn)生量大,當煤塵達到爆炸極限濃度、引風裝置將燃燒器內(nèi)高溫煙氣摻雜引火火源引入滾筒、滾筒內(nèi)熱煙氣中氧氣含量充足三個條件同時具備時,就必然發(fā)生煤塵的爆燃爆炸。雖經(jīng)實驗室以及工程實踐數(shù)次試驗,但均不能實現(xiàn)大幅度降低煤塵以及絕對消除高溫煙氣中的火星,所以,研究有效控制滾筒內(nèi)氧氣濃度在安全范圍之內(nèi),是實現(xiàn)系統(tǒng)煤塵抑爆的關(guān)鍵。依據(jù)煤塵災害發(fā)生機理,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,利用流體力學軟件Fluent及相關(guān)理論,對滾筒干燥機內(nèi)不同入口煙氣溫度下滾筒干燥機內(nèi)氧氣濃度及降水率的動態(tài)變化進行模擬研究,獲得了高溫煙氣溫度、降水率與滾筒內(nèi)氧含量之間的關(guān)系及其變化規(guī)律;研發(fā)了基于負氧熱煙氣可控循環(huán)利用系統(tǒng)。工程實踐中,基于干燥物料的特性,附以滾筒干燥機內(nèi)部結(jié)構(gòu)的調(diào)整以及系統(tǒng)運行參數(shù)的優(yōu)化,可實現(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.
【學位授予單位】：華北理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD714.5

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