發(fā)布時(shí)間：2018-07-04 20:38

  本文選題：粉體揚(yáng)塵 + 氣固兩相流��； 參考：《江南大學(xué)》2017年碩士論文

【摘要】：近年來(lái),隨著粉體物料需求日益增加,由粉體生產(chǎn)、包裝引起的粉塵污染日趨嚴(yán)重。特別在粉體充填包裝中產(chǎn)生的大量粉塵,不僅磨損生產(chǎn)設(shè)備,影響包裝精度,更傷害工人健康。本課題通過(guò)分析揚(yáng)塵規(guī)律,優(yōu)化設(shè)計(jì)粉體除塵系統(tǒng)。具體在理論分析和模擬仿真基礎(chǔ)上分析粉體充填揚(yáng)塵的影響因素以及控塵措施;計(jì)算粉塵顆粒收集條件;設(shè)計(jì)除塵罩及確定除塵參數(shù)。通過(guò)整合兩種除塵方式,設(shè)計(jì)粉體充填包裝工藝路線、工作循環(huán)圖。本課題旨在分析粉體下落揚(yáng)塵的一般規(guī)律及影響因素,為粉料包裝除塵提供理論參考。論文研究的主要內(nèi)容如下:(1)對(duì)本課題研究對(duì)象進(jìn)行調(diào)研分析,確定主要研究?jī)?nèi)容。通過(guò)分析粉體包裝過(guò)程中的實(shí)際揚(yáng)塵情況與危害,并調(diào)研該行業(yè)的生產(chǎn)現(xiàn)狀以及發(fā)展趨勢(shì),確定課題研究的目的和意義。在查閱文獻(xiàn)和生產(chǎn)調(diào)研基礎(chǔ)上,掌握國(guó)內(nèi)外對(duì)粉體包裝,揚(yáng)塵處理方面的現(xiàn)狀與進(jìn)展;理清理論研究方法—?dú)夤虄上嗟陌l(fā)展趨勢(shì);分析現(xiàn)有包裝方法中除塵的理念和措施。在此基礎(chǔ)上,明確了課題主要研究?jī)?nèi)容與課題開(kāi)展方向。(2)對(duì)粉體充填揚(yáng)塵理論的分析。從顆粒、粉體的基本物理特性展開(kāi)分析,明確顆粒粒徑、粒徑分布以及粉體密度、流動(dòng)性特點(diǎn),分析顆粒密度與粉體密度的聯(lián)系與區(qū)別,了解顆粒揚(yáng)塵的基本產(chǎn)生條件。在此基礎(chǔ)上根據(jù)粉體下落揚(yáng)塵現(xiàn)象,分析顆粒與氣流的作用過(guò)程,將其明確歸納為氣固耦合作用。在此基礎(chǔ)上,分析總結(jié)粉體揚(yáng)塵的因素條件,特別針對(duì)粉體包裝過(guò)程的揚(yáng)塵提出顆粒密度、質(zhì)量流量以及下落高度三個(gè)關(guān)鍵因素。最后,基于粉體揚(yáng)塵理論,提出適于粉體充填包裝的除塵系統(tǒng)構(gòu)思。(3)除塵流場(chǎng)內(nèi)顆粒的平衡條件及理論計(jì)算。根據(jù)氣固兩相中顆粒在流場(chǎng)內(nèi)的受力理論,結(jié)合顆粒實(shí)際運(yùn)動(dòng)情況分析氣流對(duì)顆粒的受力,場(chǎng)強(qiáng)對(duì)顆粒的受力以及其它一些作用力。分析氣流與氣壓對(duì)顆粒作用的關(guān)系,發(fā)現(xiàn)氣壓現(xiàn)象本質(zhì)由氣流產(chǎn)生。通過(guò)預(yù)估顆粒受力的量級(jí)大小,分析紊流雷諾數(shù)對(duì)顆粒運(yùn)動(dòng)影響,給出抽氣集塵時(shí)顆粒的受力上限、下限平衡方程。將方程整理、簡(jiǎn)化為氣流速度和顆粒粒徑為自變量對(duì)顆粒受力大小因變量的關(guān)系式。最后,通過(guò)MATLAB繪制平衡方程,分析抽氣除塵的理論風(fēng)速條件。(4)對(duì)粉體充填揚(yáng)塵進(jìn)行仿真模擬,分析影響因素。在氣固兩相理論基礎(chǔ)上,分析仿真機(jī)理選取合適的仿真模型與計(jì)算條件。根據(jù)生產(chǎn)實(shí)際與國(guó)家標(biāo)準(zhǔn)建立粉袋模型,設(shè)置模型參數(shù)和仿真條件,并對(duì)模型網(wǎng)格進(jìn)行無(wú)關(guān)性驗(yàn)證。在此基礎(chǔ)上,分析顆粒密度、質(zhì)量流量及下落高度對(duì)粉體下落充填揚(yáng)塵的影響。以顆粒速度分布、顆粒駐留時(shí)間、氣流速度分布以及顆粒分布占比等為基礎(chǔ)分析了粉袋內(nèi)顆粒與氣流的實(shí)際作用情況。最終確定粉體下落產(chǎn)塵量最少的距離區(qū)間。(5)除塵系統(tǒng)優(yōu)化設(shè)計(jì)。根據(jù)粉體除塵罩設(shè)置理論和粉體實(shí)際充填情況設(shè)計(jì)除塵罩。并建立除塵罩模型,設(shè)置仿真參數(shù)條件并模擬粉體除塵過(guò)程。通過(guò)顆粒速度分布、氣流速度分布及顆粒分布占比探究合理風(fēng)速。計(jì)算除塵功率,將得到的除塵參數(shù)整合,設(shè)計(jì)粉體除塵系統(tǒng),并根據(jù)工藝路線繪制工作循環(huán)圖。
[Abstract]:In recent years, with the increasing demand of powder material, the dust pollution caused by the powder production and packaging is becoming more and more serious. In particular, a large amount of dust produced in the packing and packing of powder is not only worn out to wear production equipment, but also affects the packaging precision and harm the workers' health. This subject is to optimize the dust removal system by analyzing the dust law. On the basis of analysis and Simulation simulation, the influence factors of dust filling and dust control and dust control measures are analyzed, the collecting conditions of dust particles are calculated, dust cover and dust removal parameters are designed. Through the integration of two kinds of dust removal methods, the process route of powder filling packaging and working cycle diagram are designed. The purpose of this topic is to analyze the general rule of dust falling. The main contents of the paper are as follows: (1) research and analysis of the subject of this subject, determine the main research content. Through the analysis of the actual dust situation and harm in the process of powder packaging, and investigate the production status and development trend of the industry, to determine the research topic. Objective and significance. On the basis of consulting literature and production research, we can grasp the status and progress of powder packaging and dust treatment at home and abroad, clarify the development trend of the theoretical research method - gas solid two phase, analyze the concept and measures of the dust removal in the existing packaging methods. On this basis, the main research content and the project development are clarified. (2) analysis of the theory of dust filling and dust. From the basic physical characteristics of particles and powders, the particle size, particle size distribution, powder density, fluidity characteristics, the analysis of the relation and difference between particle density and powder density are analyzed, and the basic conditions of particle dust are understood. Based on this, the dust phenomenon of the powder is lowered. The action process of particle and air flow is analyzed, and it is clearly summed up as gas-solid coupling effect. On this basis, the factors of powder dust are analyzed and summarized. In particular, three key factors, particle density, mass flow and falling height, are put forward. Finally, based on the theory of powder dust, powder filling bag is put forward. The design of the dedusting system. (3) the equilibrium conditions and theoretical calculation of the particles in the dust flow field. According to the theory of the force in the flow field in the two phase of the gas solid, the force of the air on the particles, the force of the field strength to the particles and some other forces are analyzed according to the actual movement of the particles. The relationship between the effect of air and pressure on the particles is analyzed. The present pressure is essentially generated by the air flow. By estimating the magnitude of the force of the particles, the influence of the turbulent Reynolds number on the particle motion is analyzed. The upper limit of the force and the lower equilibrium equation are given. The equation is arranged to simplify the relationship between the velocity of air flow and the particle size as the dependent variable on the size of the particles. Finally, through the equation, the relationship between the particle size and the particle size is simplified. The MATLAB balance equation is plotted and the theoretical wind speed conditions are analyzed. (4) the influence factors are simulated and the influence factors are analyzed. On the basis of the gas solid two phase theory, the suitable simulation model and the calculation conditions are selected for the simulation mechanism. The model parameters and imitation of the model are set up according to the production practice and the national standard. On the basis of this, the effect of particle density, mass flow and falling height on dust filling and dust is analyzed on this basis. The actual effects of particle velocity distribution, particle residence time, airflow velocity distribution and particle distribution ratio are analyzed on the basis of particle density, particle density, flow velocity distribution and particle distribution ratio. The optimum design of dust removal system is finally determined. (5) the design of dust removal system is optimized. Dust cover is designed based on the theory of dust dust cover setting and actual filling of powder. A model of dust cover is set up. The simulation parameters are set up and the process of dust removal is simulated. The distribution of particle velocity, distribution of air velocity and distribution of particles are carried out by the particle velocity distribution. Compared with exploring reasonable wind speed, calculating the power of dust removal, integrating the dedusting parameters, designing the dust removal system, drawing the working cycle diagram according to the technological route.
【學(xué)位授予單位】：江南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X701.2

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