本文選題：濃相氣力輸送 + 倉泵��； 參考：《濟南大學(xué)》2013年碩士論文

【摘要】：近年來，隨著我國工業(yè)化進程的不斷加快，人們環(huán)保意識的逐漸增強，在粉狀物料的輸送方面，具有自動化程度高、干凈環(huán)保等優(yōu)點的濃相氣力輸送技術(shù)得到了越來越多的應(yīng)用，廣泛應(yīng)用于食品、電廠、建材、化工等制造業(yè)領(lǐng)域。在工程應(yīng)用中，發(fā)送裝置的選擇和管道的布控是決定系統(tǒng)性能的重要因素，對輸送的穩(wěn)定性和連續(xù)性有決定性作用。 本文針對濃相氣力輸送系統(tǒng)應(yīng)用現(xiàn)狀，選取較為常用的上引式流態(tài)化發(fā)送倉泵作為研究對象，通過優(yōu)化設(shè)計，得出不同幾何參數(shù)的輸送倉泵系統(tǒng)，，進而確定最佳幾何構(gòu)型。以此為基礎(chǔ)，搭建氣力輸送實驗臺，采用空氣作為輸送動力，脫硫石膏粉體作為輸送物料，進行兩相流實驗，進而對不同幾何結(jié)構(gòu)下倉泵系統(tǒng)的流動特性進行研究，找出倉泵最優(yōu)的幾何構(gòu)型。并且結(jié)合數(shù)值模擬技術(shù)研究倉泵內(nèi)氣固兩相的流場信息，達到對輸送倉泵的優(yōu)化。 論文首先設(shè)計并開發(fā)了具有代表性的上引式流態(tài)化倉泵，通過優(yōu)化計算得到了較優(yōu)的系統(tǒng)參數(shù)，并進行了設(shè)計制作。在此基礎(chǔ)上搭建了密閉的、自動化效果良好的管道輸送系統(tǒng)。此系統(tǒng)主要包括發(fā)送倉泵、輸送管道、收料裝置和各種測試設(shè)備。實驗表明，系統(tǒng)能夠正常運行。 采用干燥的脫硫石膏粉作為輸送物料，通過改變發(fā)送倉泵的內(nèi)部幾何結(jié)構(gòu)、系統(tǒng)操作參數(shù)與系統(tǒng)參數(shù)，進行了系統(tǒng)的氣力輸送實驗，并經(jīng)過分析系統(tǒng)輸送能力、管道壓力降即能耗和系統(tǒng)穩(wěn)定性這些因素，得到了內(nèi)部最佳的幾何構(gòu)型。 在最佳的倉泵構(gòu)型基礎(chǔ)上，通過對系統(tǒng)的輸送能力、固相平均速度和系統(tǒng)能耗三個方面進行實驗，發(fā)現(xiàn)隨著表觀氣速的不斷增加，系統(tǒng)的輸送能力、固相平均速度和壓力降也隨之增加；隨著固氣比的增大，輸送能力和壓力降逐漸增大，但固相平均速度隨之減小。并且結(jié)合數(shù)學(xué)方法建立了關(guān)于輸送能力Gs和固相平均速度us的關(guān)聯(lián)式，經(jīng)過對比分析，發(fā)現(xiàn)誤差較小。 同時，論文采用數(shù)值模擬方法對發(fā)送倉泵內(nèi)的流場信息及輸送的動態(tài)特性進行了研究。得出了倉泵內(nèi)氣固兩相運動的變化規(guī)律。模擬研究發(fā)現(xiàn)，倉泵內(nèi)部發(fā)料過程兩相運動較為復(fù)雜，極易出現(xiàn)物料的大量聚集；兩相的速度矢量分布較為相似，矢量方向復(fù)雜多變，在兩相與倉泵內(nèi)壁相接觸部位能夠發(fā)生方向的改變；從顆粒速度流線圖可得出，在靠近倉泵內(nèi)壁處易形成大漩渦，在出料管附近易形成較小漩渦。同時，結(jié)合實驗研究，與實驗的設(shè)計參數(shù)相對應(yīng)，模擬改變了倉泵內(nèi)部幾何構(gòu)型。通過分析固相體積分布、固相速度矢量和顆粒速度流線圖，對比分析了不同結(jié)構(gòu)下兩相流場的變化規(guī)律，達到對倉泵優(yōu)化設(shè)計的目的。
[Abstract]:In recent years, with the acceleration of industrialization in China and the increasing awareness of environmental protection, there is a high degree of automation in the transportation of powdery materials. The dense phase pneumatic conveying technology with the advantages of clean and environmental protection has been applied more and more widely in the fields of food, power plant, building materials, chemical industry and so on. In engineering application, the selection of transmission device and the distribution and control of pipeline are the important factors that determine the system performance, and play a decisive role in the stability and continuity of transportation. In view of the present situation of application of dense phase pneumatic conveying system, the more commonly used updraft fluidized conveying bin pump is chosen as the research object. Through the optimization design, the conveying bin pump system with different geometric parameters is obtained, and the optimum geometric configuration is determined. On this basis, a pneumatic conveying test bench was built, air was used as conveying power, desulfurized gypsum powder was used as conveying material, and two-phase flow experiments were carried out, and the flow characteristics of silo pump system with different geometry were studied. Find out the optimal geometric configuration of the bin pump. Combined with numerical simulation technology, the flow field information of gas-solid two-phase in the tank pump is studied, and the optimization of the conveying bin pump is achieved. In this paper, a representative upfront fluidized bin pump is designed and developed. The optimal system parameters are obtained by optimizing calculation, and the system parameters are designed and manufactured. On this basis, a closed and automatic pipeline conveying system is built. This system mainly includes sending bin pump, conveying pipe, collecting device and various test equipment. The experiment shows that the system can run normally. The dry desulphurized gypsum powder is used as the conveying material. By changing the internal geometric structure of the delivery bin pump, the system operating parameters and system parameters, the pneumatic conveying experiment of the system is carried out, and the conveying capacity of the system is analyzed. The pressure drop, that is, energy consumption and system stability, is the best internal geometry. On the basis of the optimum configuration of bunker pump, through the experiments on the transportation capacity of the system, the average velocity of the solid phase and the energy consumption of the system, it is found that with the increasing of the apparent gas velocity, the transportation capacity of the system is increased. With the increase of solid-gas ratio, the transport capacity and pressure drop increased gradually, but the average velocity of solid phase decreased. The correlation between the transport capacity Gs and the average velocity of solid phase is established by combining the mathematical method. Through comparison and analysis, it is found that the error is relatively small. At the same time, numerical simulation method is used to study the information of flow field and the dynamic characteristics of transport. The change law of gas-solid two-phase motion in bin pump is obtained. The simulation results show that the two-phase motion is more complex and the mass accumulation of materials is easy to occur in the process of loading and unloading, and the velocity vector distribution of the two phases is similar, and the direction of the vector is complex and changeable. The direction of the two phase contact with the inner wall of the bin pump can be changed, and from the flow chart of particle velocity, it can be concluded that a large vortex is formed near the inner wall of the bin pump and a smaller vortex is easily formed near the discharge pipe. At the same time, according to the experimental design parameters, the simulation changes the internal geometry of the bin pump. Through the analysis of solid volume distribution, solid velocity vector and particle velocity streamline diagram, the variation law of two-phase flow field under different structures is compared and analyzed to achieve the purpose of optimizing the design of silo pump.
【學(xué)位授予單位】：濟南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TH232

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