煤矸石页岩烧结砖的节能研究

发布时间：2018-08-11 20:13

【摘要】：摘要：随着国家墙体材料政策的改革和落实,粘土实心砖已被逐渐禁止和淘汰,煤矸石烧结砖作为一种新型的墙材材料,因其具有保护环境、节约耕地、性能优越等特点受到了越来越广泛的重视,因此对于煤矸石烧结砖的节能研究具有重要的意义。本文以湖南省常德市某砖瓦企业研究对象,采用原型研究法与数值模拟法相结合的方式,通过FLUENT软件对隧道焙烧窑内的温度场进行了数值模拟,主要工作如下：结合研究对象,对煤矸石烧结砖制作过程中的耗电量进行了现场测试,分析了原料破碎部分的耗电量以及风机运行的耗电量与产量之间的关系；对制作烧结砖的原料的热值进行了测量,研究发现原料热值的波动较大。对隧道焙烧窑进行了热平衡测试分析,结果显示其主要能耗在固体的不完全燃烧热损失以及砖坯出窑热损失,研究发现引起该损失的主要原因是窑内起火车位的后移。建立了隧道焙烧窑的物理及数学模型,采用k-ε湍流模型以及多孔介质非平衡模型模拟了窑内的温度分布,通过比较数值模拟与现场测试结果验证了所选模型的合理性。数值模拟了进风量、预热段砖坯的含水率以及原料热值对焙烧窑内起火车位及砖坯焙烧时间的影响,研究发现砖坯的含水率是影响起火车位的最主要的因素。最后针对该隧道焙烧窑目前存在的问题,提出了一种优化方案,比较分析了优化前后窑内的起火车位的及砖坯焙烧时间的不同,并通过测试前后窑内温度场及成品“黑心”现象的对比验证了该方案的可行性,优化方案实施后的节能率为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.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU522.1

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