本文選題：褐煤 + 流化床干燥器�。� 參考：《中國(guó)礦業(yè)大學(xué)》2015年碩士論文

【摘要】：褐煤通過流化床干燥是其提質(zhì)的重要方式,對(duì)流化床來說,布風(fēng)板結(jié)構(gòu)對(duì)流化質(zhì)量?jī)?yōu)劣起著決定性的作用。布風(fēng)板結(jié)構(gòu)形式多樣,但用于干燥的流化床設(shè)備因特殊的高溫條件,布風(fēng)板依舊以初始階段的直孔或斜孔型為主。本文針對(duì)用于干燥流化床布風(fēng)板現(xiàn)狀,對(duì)其結(jié)構(gòu)提出多種改進(jìn)措施。以布風(fēng)性能優(yōu)良的側(cè)流型布風(fēng)板和加工制造廉價(jià)的直孔型布風(fēng)板為基礎(chǔ),結(jié)合兩種類型布風(fēng)板的特性和優(yōu)勢(shì),創(chuàng)新性地設(shè)計(jì)出四種新型布風(fēng)板結(jié)構(gòu),分別命名為普通斜孔型布風(fēng)板、旋轉(zhuǎn)斜孔型布風(fēng)板、六角對(duì)吹斜孔型布風(fēng)板和傘型帽板分離型布風(fēng)板。建立安裝四種不同結(jié)構(gòu)布風(fēng)板的流化床三維模型、合理劃分網(wǎng)格、確定數(shù)值模擬方法和邊界條件后,用FLUENT軟件對(duì)四種結(jié)構(gòu)開展單相流三維模型數(shù)值模擬,得到了一系列模擬結(jié)果且通過壓降實(shí)驗(yàn)驗(yàn)證模擬結(jié)果的正確性。通過對(duì)比分析氣流速度矢量圖形、軸向壓降、徑向靜壓曲線和氣流分布形態(tài)等參數(shù)認(rèn)定傘型帽板分離型布風(fēng)板為四種創(chuàng)新性結(jié)構(gòu)中的最佳結(jié)構(gòu),再通過褐煤干燥熱態(tài)實(shí)驗(yàn),對(duì)比安裝四種布風(fēng)板流化床在相同參數(shù)下的褐煤干燥效率和干燥均勻度兩個(gè)參數(shù),實(shí)驗(yàn)結(jié)果證明安裝傘型帽板分離型布風(fēng)板的流化床無論是褐煤干燥效率還是干燥均勻度均是最佳,確定最佳結(jié)構(gòu)為傘型帽板分離型布風(fēng)板。針對(duì)傘型帽板分離型布風(fēng)板進(jìn)行了開孔率研究,開孔率分別為2.24%、5.04%和8.95%。分別對(duì)安裝此三種開孔率布風(fēng)板的流化床模型開展氣固兩相流二維數(shù)值模擬,對(duì)比壓降波動(dòng)均方根(RMS)、顆粒分布和氣固相速度矢量圖形等參數(shù)確定最佳開孔率為2.24%,然后通過對(duì)比安裝三種不同開孔率布風(fēng)板的流化床的褐煤干燥效率,實(shí)驗(yàn)結(jié)果表明三種中2.24%對(duì)于傘型帽板分離型布風(fēng)板為最佳開孔率。
[Abstract]:The drying of lignite in fluidized bed is an important way to improve its quality. In the fluidized bed, the structure of the fluidized bed has a decisive effect on the quality of the fluidized bed. The structure of the air cloth plate is varied, but the fluidized bed equipment used for drying is still dominated by the initial straight hole or the oblique pass because of the special high temperature conditions. A variety of improvement measures are put forward for the structure of the dry fluidized bed air cloth plate. On the basis of the side flow pattern plate with excellent wind performance and the manufacturing and manufacturing of the cheap straight hole type cloth wind plate, combined with the characteristics and advantages of the two types of wind sheet, the structure of the four new type of wind sheet is designed, which are named as the ordinary inclined hole type sheet. A rotating inclined hole type cloth wind plate, six angles to the blowing plate and the parachute cap plate separation type air plate. The three-dimensional model of the fluidized bed is set up and installed with four different structures of the wind plate. The numerical simulation method and the boundary condition of the numerical simulation method and the boundary condition are set up. The FLUENT software is used to simulate the three-dimensional model of the single phase flow with the four structures. A series of simulation results are used to verify the correctness of the simulation results. By comparing and analyzing the parameters of the velocity vector graphics, axial pressure drop, radial static pressure curve and air distribution pattern, the best structure of four kinds of innovative structures is found in the umbrella type cap plate separation type. The drying efficiency and Drying Uniformity of four kinds of wind sheet fluidized bed with the same parameters are two parameters. The experimental results show that the best structure is the drying efficiency of brown coal and the evenness of drying, and the best structure is the separation type air plate of the umbrella type cap plate. The opening rate is studied. The opening rate is 2.24%, 5.04% and 8.95%. respectively. The two dimensional numerical simulation of gas solid two phase flow is carried out respectively on the fluidized bed model of the three kinds of open hole rate sheet. The optimum opening rate is determined by comparing the pressure drop mean square root (RMS), the particle distribution and the gas solid velocity vector figure to determine the optimum opening rate. The drying efficiency of three kinds of fluidized bed lignite with different opening rate is compared. The experimental results show that the optimum opening rate is 2.24% for the parachute type cap plate separation type air plate in the three kinds.

【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ051.13;TQ536

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本文編號(hào)：1774723