【摘要】：摘要：隨著國家墻體材料政策的改革和落實,粘土實心磚已被逐漸禁止和淘汰,煤矸石燒結(jié)磚作為一種新型的墻材材料,因其具有保護(hù)環(huán)境、節(jié)約耕地、性能優(yōu)越等特點受到了越來越廣泛的重視,因此對于煤矸石燒結(jié)磚的節(jié)能研究具有重要的意義。 本文以湖南省常德市某磚瓦企業(yè)研究對象,采用原型研究法與數(shù)值模擬法相結(jié)合的方式,通過FLUENT軟件對隧道焙燒窯內(nèi)的溫度場進(jìn)行了數(shù)值模擬,主要工作如下： 結(jié)合研究對象,對煤矸石燒結(jié)磚制作過程中的耗電量進(jìn)行了現(xiàn)場測試,分析了原料破碎部分的耗電量以及風(fēng)機運行的耗電量與產(chǎn)量之間的關(guān)系；對制作燒結(jié)磚的原料的熱值進(jìn)行了測量,研究發(fā)現(xiàn)原料熱值的波動較大。對隧道焙燒窯進(jìn)行了熱平衡測試分析,結(jié)果顯示其主要能耗在固體的不完全燃燒熱損失以及磚坯出窯熱損失,研究發(fā)現(xiàn)引起該損失的主要原因是窯內(nèi)起火車位的后移。 建立了隧道焙燒窯的物理及數(shù)學(xué)模型,采用k-ε湍流模型以及多孔介質(zhì)非平衡模型模擬了窯內(nèi)的溫度分布,通過比較數(shù)值模擬與現(xiàn)場測試結(jié)果驗證了所選模型的合理性。 數(shù)值模擬了進(jìn)風(fēng)量、預(yù)熱段磚坯的含水率以及原料熱值對焙燒窯內(nèi)起火車位及磚坯焙燒時間的影響,研究發(fā)現(xiàn)磚坯的含水率是影響起火車位的最主要的因素。 最后針對該隧道焙燒窯目前存在的問題,提出了一種優(yōu)化方案,比較分析了優(yōu)化前后窯內(nèi)的起火車位的及磚坯焙燒時間的不同,并通過測試前后窯內(nèi)溫度場及成品“黑心”現(xiàn)象的對比驗證了該方案的可行性,優(yōu)化方案實施后的節(jié)能率為5.6%。
[Abstract]:Abstract: with the reform and implementation of the national wall material policy, the clay solid brick has been gradually banned and eliminated. As a new type of wall material, coal gangue sintered brick is a new type of wall material, because of its protection of environment and conservation of cultivated land. More and more attention has been paid to the characteristics of superior performance, so it is of great significance to study the energy saving of coal gangue sintered brick. In this paper, a brick and tile enterprise in Changde City, Hunan Province, was used to simulate the temperature field in a tunnel roasting kiln by using the method of prototype research and numerical simulation. The main work is as follows: combined with the research object, the power consumption of coal gangue sintered brick is tested on the spot, and the relationship between the power consumption of the broken part of raw material and the power consumption of fan operation and the output is analyzed. The calorific value of raw material for sintered brick was measured, and it was found that the calorific value of raw material fluctuated greatly. The heat balance test of tunnel calciner is carried out. The results show that the main energy consumption is the heat loss of incomplete combustion of solid and the heat loss of brick kiln. It is found that the main reason of this loss is the backward movement of fire parking space in kiln. The physical and mathematical models of the tunnel kiln were established. The temperature distribution in the kiln was simulated by using the k- 蔚 turbulence model and the non-equilibrium model of porous media. The rationality of the selected model was verified by comparing the numerical simulation with the field test results. The effects of air intake, moisture content of preheated brick and calorific value of raw materials on fire parking and firing time in roasting kiln are numerically simulated. It is found that the moisture content of brick billet is the most important factor affecting the fire parking space. Finally, aiming at the existing problems of the tunnel kiln, an optimization scheme is put forward, and the difference of the fire parking space and the firing time of brick billet before and after the optimization is compared and analyzed. The feasibility of the scheme is verified by comparing the temperature field in kiln before and after the test and the "black heart" phenomenon of finished product. The energy saving rate of the optimized scheme is 5.6.
【學(xué)位授予單位】：中南大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU522.1

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