本文選題：轉(zhuǎn)運(yùn)站 + 粘性物料　； 參考：《湘潭大學(xué)》2017年碩士論文

【摘要】：轉(zhuǎn)運(yùn)站是現(xiàn)代散狀物料輸送設(shè)備中的重要組成部分。在轉(zhuǎn)運(yùn)過程中物料從頭部輥筒進(jìn)行拋料,通過頭罩的導(dǎo)流作用使其進(jìn)入落料管內(nèi),然后順著落料管管壁落入下行皮帶被運(yùn)送到指定位置。因此,頭罩內(nèi)的結(jié)構(gòu)與落料管設(shè)計(jì)的好壞直接影響著物料轉(zhuǎn)送的效率與轉(zhuǎn)運(yùn)站的使用壽命。國內(nèi)外學(xué)者在對于轉(zhuǎn)運(yùn)過程的研究時(shí),通常忽略了物料含有一定水分,從而未考慮其具有一定的粘性,而在實(shí)際工程中物料的粘性對于轉(zhuǎn)運(yùn)過程影響是巨大的。因此,有必要從理論計(jì)算、實(shí)驗(yàn)研究和數(shù)值仿真等相結(jié)合的角度對粘性物料在轉(zhuǎn)運(yùn)過程中的影響進(jìn)行研究,本文從以下幾個(gè)方面開展工作:(1)一般粘性物料的粒徑都在微米級別,顆粒間的粘結(jié)力大于其重力,因此,在研究轉(zhuǎn)運(yùn)過程中粘性顆粒間的相互作用力時(shí),必須考慮顆粒間的粘結(jié)力。本文首先介紹了經(jīng)典彈性模型以及JKR模型、液橋模型,分析了它們的適用范圍,在此基礎(chǔ)上以濕煤粉作為粘性物料研究對象,提出適用于濕煤粉顆粒的接觸模型,采用API建立EDEM中的接觸計(jì)算模型。(2)通過直剪試驗(yàn)測試得到濕煤粉顆粒間的內(nèi)摩擦系數(shù),通過斜板實(shí)驗(yàn)測試得到濕煤粉顆粒與皮帶及鋼板間的滑動(dòng)角,采用電熱恒溫干燥箱測試了實(shí)驗(yàn)樣品的含水率,并且通過塌落實(shí)驗(yàn)校準(zhǔn)了濕煤粉顆粒間的粘性參數(shù)。(3)通過建立簡化的拋料模型,分析了濕煤粉顆粒間粘性對于拋料過程的影響,并且計(jì)算了在考慮粘性的情況下物料的卸料軌跡,與仿真結(jié)果進(jìn)行了對比。在此基礎(chǔ)上分析了轉(zhuǎn)運(yùn)站頭罩內(nèi)擋板的形狀。(4)建立了轉(zhuǎn)運(yùn)站落料管的簡化模型,利用前面所確立的濕煤粉DEM微觀接觸模型以及宏觀接觸參數(shù),進(jìn)行濕煤粉在落料管中轉(zhuǎn)運(yùn)過程仿真。確定其它參數(shù)不變,分別改變上行皮帶的速度、喂料速度、物料粘性等參數(shù),然后分析了各個(gè)參數(shù)在轉(zhuǎn)運(yùn)過程中對于落料管堵塞行為的影響,統(tǒng)計(jì)物料流出落料管時(shí)的速度預(yù)測其對于下行皮帶的沖擊影響。
[Abstract]:Transfer station is an important part of modern bulk material transportation equipment.In the process of transfer, the material is thrown from the head roller, and through the flow guide action of the hood, the material enters the drop pipe, and then falls down the tube wall and is transported to the designated position.Therefore, the structure of the hood and the design of the discharge pipe directly affect the efficiency of material transfer and the service life of the transfer station.In the research of the transfer process, scholars at home and abroad usually ignore the fact that the material contains a certain amount of water, so it is not considered that the material has a certain viscosity. However, in practical engineering, the viscosity of the material has a great impact on the transfer process.Therefore, it is necessary to study the influence of viscous materials on the transport process from the angle of theoretical calculation, experimental research and numerical simulation.The adhesion between particles is greater than its gravity. Therefore, in studying the interaction between viscous particles in the transport process, the adhesion between particles must be taken into account.In this paper, the classical elastic model, JKR model and liquid bridge model are introduced, and their application range is analyzed. On the basis of this, a contact model suitable for wet pulverized coal particles is put forward, based on which wet coal powder is used as the object of study on viscous materials.The contact calculation model in EDEM was established by API. (2) the internal friction coefficient between wet pulverized coal particles was obtained by direct shear test, and the slip angle between wet pulverized coal particle and belt and steel plate was obtained by inclined plate test.The moisture content of the experimental sample was measured by electrothermal constant temperature drying box, and the viscosity parameter between wet coal particles was calibrated by collapsing experiment. The effect of viscosity between wet coal particles on the process of material throwing was analyzed by establishing a simplified model of throwing material.The unloading trajectory of the material considering viscosity is calculated and compared with the simulation results.On this basis, the shape of the inner baffle of the hood of the transfer station is analyzed. The simplified model of the unloading pipe of the transfer station is established. The microscopic contact model of wet pulverized coal (DEM) and the macroscopic contact parameters are used.The transfer process of wet pulverized coal in blanking tube was simulated.Other parameters are determined to change the speed of the uplink belt, feeding speed, material viscosity and so on. Then, the influence of each parameter on the clogging behavior of the blanking pipe is analyzed in the process of transportation.The impact of the material on the down belt is predicted by calculating the velocity of the material flowing out of the blanking pipe.
【學(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD50;TP391.9

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