本文關(guān)鍵詞： 粉體 排料流率 壓降　出處：《中國科學(xué)院大學(xué)(中國科學(xué)院工程熱物理研究所)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：本文在粉體連續(xù)排料降壓裝置上,開展了豎管壓降特性研究、篩網(wǎng)壓降特性研究以及排料流率實(shí)驗(yàn)研究,得到以下結(jié)論:1.豎管壓降特性實(shí)驗(yàn)1)當(dāng)料倉壓力一定時(shí),顆粒移動(dòng)速度對豎管段壓降影響很小,可以忽略,而隨著表觀氣速的增大,豎管段壓降呈線性增大;當(dāng)表觀氣速一定時(shí),豎管段壓降隨著料倉壓力的升高而增大。2)表觀氣速Ug0在0～0.2m/s范圍內(nèi)時(shí),空隙率ε基本不隨表觀顆粒速度Us0和表觀氣速Ug0變化,而隨入口壓力Pin的增大而減小。提出了適用于豎管移動(dòng)床的空隙率-壓力擬合計(jì)算公式:ε = 0.32+ 0.04067/Pm。通過該擬合公式以及Ergun方程可以較為準(zhǔn)確的預(yù)測豎管段壓降,在本實(shí)驗(yàn)范圍內(nèi),壓降預(yù)測的最大誤差小于20%。2.篩網(wǎng)卸壓特性實(shí)驗(yàn)1)對于同一種物料,隨著篩網(wǎng)排氣流量的增大,篩網(wǎng)壓降逐漸升高;2)在排氣流量一定時(shí),隨著顆粒粒徑的增大,篩網(wǎng)段壓降逐漸降低;3)在料倉壓力PA一定的情況下,隨著篩網(wǎng)排氣量的增大,篩網(wǎng)段壓降占總壓降的百分比逐漸升高。3.排料流率特性實(shí)驗(yàn)1)隨著L段入口壓力的升高,排料流率先緩慢增大,處于穩(wěn)定排料狀態(tài),當(dāng)入口壓力增大到一定值后,排料流率迅速增大,且L段入口壓力會自發(fā)下降,進(jìn)入流動(dòng)失穩(wěn)狀態(tài)。2)對于管徑較大的L段彎管而言,其排料啟動(dòng)壓力更低,排料流率更大,排料曲線的斜率更大。3)對平均粒徑較大的物料而言,其排料過程中的啟動(dòng)壓力更低,且在相同入口壓力下排料流率更大。
[Abstract]:In this paper, the characteristics of vertical tube pressure drop, sieve net pressure drop characteristic and discharge flow rate are studied on the powder continuous discharge pressure lowering device. The following conclusions are obtained: 1) when the silo pressure is constant, the pressure drop characteristic of vertical tube is tested. The effect of particle moving velocity on the pressure drop of vertical pipe is very small and can be ignored. However, with the increase of apparent gas velocity, the pressure drop of vertical pipe increases linearly, and when the apparent gas velocity is constant, the pressure drop of vertical pipe increases linearly with the increase of apparent gas velocity. The pressure drop of vertical pipe increases with the increase of silo pressure. 2) when the apparent gas velocity (Ug0) is in the range of 0 ~ 0.2 m / s, the porosity 蔚 basically does not change with the apparent particle velocity Us0 and the apparent gas velocity Ug0. However, with the increase of inlet pressure Pin, the porosity pressure fitting formula for vertical tube moving bed is proposed: 蔚 = 0.32 0.04067% Pm. Through this fitting formula and Ergun equation, the vertical pipe pressure drop can be predicted more accurately. The maximum error of pressure drop prediction is less than 20. 2. Experiment 1) for the same material, the pressure drop of the screen increases gradually with the increase of the exhaust flow rate of the screen)) with the increase of the particle size, the pressure drop of the screen increases gradually when the exhaust flow rate is fixed. The pressure drop of sieve mesh section gradually decreases.) under the condition of constant pressure PA of sieve, the percentage of pressure drop of screen net segment to total pressure drop gradually increases with the increase of screen net exhaust volume. Experiment 1) with the increase of inlet pressure of L section, the pressure drop of sieve mesh section increases gradually. When the inlet pressure increases to a certain value, the discharge flow rate increases rapidly, and the inlet pressure of L section will decrease spontaneously, and enter the flow instability state. 2) for the L section elbow with larger diameter, the discharge flow increases slowly and stably, and the discharge rate increases rapidly when the inlet pressure increases to a certain value. The starting pressure is lower, the discharge flow rate is larger, and the slope of discharge curve is larger. 3) for the material with larger average particle size, the starting pressure is lower and the discharge flow rate is larger under the same inlet pressure.
【學(xué)位授予單位】：中國科學(xué)院大學(xué)(中國科學(xué)院工程熱物理研究所)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ545

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