本文選題：轉(zhuǎn)載站 + 塊煤��； 參考：《西安科技大學》2017年碩士論文

【摘要】：針對陜北侏羅紀煤田千萬噸級大型現(xiàn)代化礦井,煤炭運輸距離長、運量大,煤炭轉(zhuǎn)載過程中塊煤破碎問題,以及設(shè)備磨損、煤塵、噪音等問題突出,采用EDEM數(shù)值分析方法、破碎理論分析、現(xiàn)場試驗等綜合手段,對大流量、長距離、多轉(zhuǎn)載煤炭運輸轉(zhuǎn)載塊煤率損失機理和控制進行了以下研究。通過物理力學實驗測定煤的物理力學參數(shù),采用EDEM建立煤塊顆粒結(jié)構(gòu)模型和粘結(jié)接觸模型,分析不同入射速度、入射角度、煤塊形狀、煤塊強度,材質(zhì)等情況下煤塊的碰撞破碎過程,得出煤塊入射速度和角度越大,破碎越嚴重及其之間的二元擬合關(guān)系;得出加橡膠內(nèi)襯情況下,塊煤破碎率降低了 21.5%;塊煤強度增大,塊煤破碎較難。仿真分析了球形、立方體、片狀塊煤的碰撞過程,得出其碰撞力鍵斷裂率分別是:立方塊13%,片狀43%,球形3%,從而進一步得出碰撞接觸面積越大,煤塊碰撞破碎越難。建立了千萬噸級塊煤顆粒流模型,對塊煤的堆積角、煤流軌跡、煤流質(zhì)量流率、卸料速度等問題進行研究,并與現(xiàn)場情況進行對比,模擬結(jié)果與理論計算完全相符。對塊煤破碎的轉(zhuǎn)載損失及止損進行仿真分析,得出弧形型擋料板能有效減少沖擊;得出煤流在沖擊緩沖箱后,速度大大降低,且煤流沖擊緩沖箱后煤流離散性較大,不利于防塵,沖擊系數(shù)是弧形擋料板的50倍,不利于防破碎;對煤流高、低位的煤顆粒進行追蹤監(jiān)測,發(fā)現(xiàn)高位的煤流顆粒在緩沖堆內(nèi)部緩慢運動,低位的煤顆粒沿緩沖斜面迅速離開緩沖箱,從而出現(xiàn)后來的低位煤流顆粒總是在不斷的沖擊之前的高位煤流顆粒;理論分析并仿真分析得出弧形溜槽能更好的避免跌落過程中引起的沖擊過大問題;通過對溜槽末端有、無弧形導向段的情況進行仿真,得出有弧形導向段的溜槽能更好減少煤流對下部膠帶運輸機皮帶面的沖擊。將研究結(jié)果應用于轉(zhuǎn)龍灣煤礦轉(zhuǎn)載站改造中,根據(jù)存在的問題設(shè)計了新的轉(zhuǎn)載站,通過仿真驗證了新轉(zhuǎn)載站在煤流速度控制和防破碎方面的優(yōu)越性,將設(shè)計的轉(zhuǎn)載站應用了生產(chǎn)現(xiàn)場,使塊煤率提高了 12.1%。
[Abstract]:In view of the large modern coal mine of ten million tons in Jurassic coal field of northern Shaanxi, the coal transport distance is long, the volume of coal transportation is large, the coal is broken in the process of coal transfer, and the problems of equipment wear, coal dust and noise are prominent, the EDEM numerical analysis method is adopted. This paper studies the mechanism and control of coal rate loss in large flow, long distance and long distance coal transportation by comprehensive means such as crushing theory analysis and field test. The physical and mechanical parameters of coal were measured by physical and mechanical experiments. The particle structure model and bond contact model were established by EDEM, and the different incident velocity, incident angle, coal block shape, coal mass strength were analyzed. Under the condition of material and other conditions, the collision process of coal block is obtained. The bigger the incident velocity and angle of coal block is, the more serious the breakage is and the binary fitting relationship between them is obtained. When rubber lining is added, the crushing rate of block coal decreases by 21.5wt%, and the strength of block coal increases. Block coal is difficult to break. The collision process of spherical, cubic and flake block coal is simulated and analyzed, and the fracture rate of collision force bond is obtained as follows: vertical block 13, sheet 43 and spherical 3. The larger the impact contact area is, the more difficult it is to break the coal block. The particle flow model of ten million tonnage block coal is established. The accumulation angle, coal flow trajectory, coal flow mass flow rate and discharge speed of block coal are studied, and the simulation results are in good agreement with the theoretical calculation. Based on the simulation analysis of the transfer loss and stop loss of block coal crushing, it is concluded that the arc block plate can effectively reduce the impact, and the coal flow speed is greatly reduced after the impact of the buffer box, and the coal flow dispersion is larger after the coal flow impact the buffer box. It is not good for dust prevention, the impact coefficient is 50 times as high as the arc block, which is not good for the prevention of breakage, the high coal flow particles are tracked and monitored, and it is found that the high coal flow particles are moving slowly in the buffer reactor. The low coal particles leave the buffer box quickly along the buffering inclined plane, thus the later low coal flow particles always appear before the continuous impact of the high coal flow particles; Theoretical analysis and simulation analysis show that the arc chute can better avoid the excessive impact caused by the falling process. It is concluded that the chute with arc guide section can reduce the impact of coal flow on the belt surface of the lower belt conveyor. The research results are applied to the reconstruction of the coal transfer station in Xilongwan Coal Mine. According to the existing problems, a new reloading station is designed. The superiority of the new reprint station in coal flow speed control and anti-crushing is verified by simulation. The designed transfer station is applied to the production site and the block coal rate is increased by 12. 1%.
【學位授予單位】：西安科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD528.1

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