本文關(guān)鍵詞：顆粒粉塵在通風(fēng)管道內(nèi)的運(yùn)移規(guī)律研究　出處：《江西理工大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 顆粒粉塵 通風(fēng)管道 粉塵濃度 數(shù)值模擬 運(yùn)移規(guī)律

【摘要】：眾所周知,工業(yè)粉塵治理需通過(guò)選擇合理的除塵方法才能達(dá)到較好的降塵效果。目前,帶有長(zhǎng)管道的機(jī)械通風(fēng)除塵措施是工業(yè)粉塵治理的有效措施之一。隨著顆粒粉塵在管道內(nèi)長(zhǎng)時(shí)間排出,管道內(nèi)勢(shì)必會(huì)產(chǎn)生沉積現(xiàn)象。如果對(duì)其中的顆粒粉塵不采取處理措施,會(huì)導(dǎo)致很多不良的后果,特別是在管道內(nèi)部,輕則粉塵堆積,重則導(dǎo)致管道堵塞、腐蝕等。在進(jìn)行粉塵清除前,如能對(duì)管道內(nèi)部粉塵運(yùn)移、沉降的規(guī)律有所了解,這對(duì)粉塵清除工作以及根據(jù)規(guī)律重新設(shè)計(jì)管道結(jié)構(gòu)參數(shù)將會(huì)起到一定的幫助。本文以工業(yè)除塵管道為研究對(duì)象,基于流體力學(xué)、射流理論和計(jì)算流體動(dòng)力學(xué)等理論,通過(guò)Fluent6.3.26模擬軟件對(duì)圓管和方管建立了物理和數(shù)學(xué)模型,采用Standard k-e模型和標(biāo)準(zhǔn)壁面函數(shù)對(duì)管道內(nèi)的風(fēng)流流場(chǎng)進(jìn)行數(shù)值分析,并模擬了風(fēng)速、粉塵粒徑以及管型對(duì)管道內(nèi)粉塵濃度分布、沉積的影響。主要研究成果如下:(1)選取標(biāo)準(zhǔn)雙方程模型可以有效的數(shù)值模擬兩種管道內(nèi)部風(fēng)流流場(chǎng)及不同粒徑粉塵的分布。(2)管道壁面壓力大小分布受管型以及粉塵粒徑影響較小,受風(fēng)速影響較大。(3)在管道長(zhǎng)度達(dá)到一定長(zhǎng)度后,管道內(nèi)流速大小分布不受管道長(zhǎng)度的影響,當(dāng)圓管長(zhǎng)度大于25m、方管大于30m時(shí),管道內(nèi)流速分布穩(wěn)定,變化小。輸運(yùn)風(fēng)速越大,管道內(nèi)達(dá)到最大速度時(shí)的增值△v越大,但達(dá)到最大流速位置基本不變,圓管為15m處,方管為18m處。(4)不同粒徑粉塵在管道內(nèi)輸運(yùn)都具有相應(yīng)的最低沉積濃度輸運(yùn)風(fēng)速,輸運(yùn)風(fēng)速太低,達(dá)不到粉塵輸運(yùn)的效果;輸運(yùn)風(fēng)速太高,能耗增大,粉塵與管壁碰撞概率增大;因此在進(jìn)行通風(fēng)風(fēng)速設(shè)計(jì)時(shí),應(yīng)當(dāng)針對(duì)不同粒徑粉塵選擇最佳輸運(yùn)風(fēng)速。(5)16m/s送風(fēng)風(fēng)速下,對(duì)于粒徑粉塵為0.25μm至2.5μm時(shí),方管內(nèi)壁上的平均粉塵沉積濃度值要比圓管低。粒徑為0.25μm時(shí),方管壁面平均粉塵濃度值比圓管低0.05g/m3;粒徑為2.5μm時(shí),方管壁面平均粉塵濃度值比圓管低0.15g/m3;因此針對(duì)工業(yè)管道在16m/s風(fēng)速下輸運(yùn)粒徑為0.25μm至2.5μm粉塵時(shí),可考慮采用方形管道輸運(yùn)。
[Abstract]:As we all know, industrial dust control needs to select a reasonable dust removal method in order to achieve a better dust control effect. Mechanical ventilation and dust removal with long ducts is one of the effective measures for the treatment of industrial dust. If the particle dust is not treated, it will lead to a lot of adverse consequences, especially in the pipeline, light dust accumulation, heavy lead to pipeline blockage. Corrosion and so on. Before dust removal, such as the pipeline internal dust migration, settlement of the law of some understanding. This will play a certain role in dust removal and re-design of pipeline structural parameters according to the rules. This paper takes the industrial dust removal pipeline as the research object, based on hydrodynamics. Based on the theory of jet and computational fluid dynamics, the physical and mathematical models of circular and square tubes are established by Fluent6.3.26 simulation software. The Standard k-e model and the standard wall function are used to numerically analyze the air flow field in the pipeline, and the distribution of the wind speed, dust particle size and the dust concentration in the pipe is simulated. The main research results are as follows: 1) the standard two-equation model can be used to numerically simulate the airflow field and the distribution of dust with different particle sizes in two pipelines. The pressure distribution of pipe wall is less affected by pipe type and dust particle size. When the length of pipe reaches a certain length, the distribution of velocity is not affected by the length of pipe. When the length of round pipe is more than 25m, the length of square pipe is more than 30m. The velocity distribution in the pipeline is stable and the change is small. The larger the transport wind speed is, the greater the increment v is when the maximum velocity is reached in the pipeline, but the position of reaching the maximum velocity is basically unchanged, and the position of the circular pipe is 15m. The dust transport with different particle size in the pipeline has the corresponding lowest sediment concentration transport wind speed, which is too low to achieve the effect of dust transport. If the transport speed is too high, the energy consumption will increase, and the collision probability between dust and pipe wall will increase. Therefore, in the design of ventilation wind speed, we should select the best transport speed of 16 m / s for different particle size dust, when the particle size dust is 0.25 渭 m to 2.5 渭 m. The average dust concentration on the inner wall of the square tube is lower than that on the circular tube, and when the diameter is 0.25 渭 m, the average dust concentration on the wall of the square tube is 0.05g / m 3 lower than that on the round tube. When the particle size is 2.5 渭 m, the average dust concentration on the wall of the square tube is 0.15g / m ~ (-3) lower than that of the round tube. Therefore, when industrial pipelines transport dust particles from 0.25 渭 m to 2.5 渭 m at 16 m / s wind speed, square pipeline transport can be considered.
【學(xué)位授予單位】：江西理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：X701.2

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