燃气灶挡风节能罩的研究

发布时间：2018-03-24 04:30

本文选题：燃气灶　切入点：挡风节能罩　出处：《青岛理工大学》2013年硕士论文

【摘要】：全球工业化进程的飞速发展，导致了能源的大量消耗，，能源紧缺问题也变得越来越明显。虽然现在不断开发新型能源的利用，但是作为能源主流的煤、石油、天然气依然占据着全球能源的主导地位，而这三种主流能源都属于非可再生资源。在不断的消耗之下，其存储量也越来越少，节能也就成为现阶段社会发展的一个主题。在我国，燃气的使用非常广泛，尤其是在家用燃气灶具方面的使用占据了非常大的比例。燃气灶平均热效率作为衡量燃气灶燃烧效率的主要指标，我国现阶段的大部分燃气灶平均热效率并不高，造成了大量的能源浪费。为了顺应全球节能的社会大趋势，对于提高燃气灶的平均热效率研究也在不断深化。现阶段，对燃气灶具的节能研究主要在集中于开发设计新型结构的燃气灶和燃气灶附属装置研究。本文对燃气灶附属装置挡风节能罩进行研究，分析其节能特性，为开发节能效果更好的挡风节能罩提供依据。本文借助CFD软件FLUENT对某一家用燃气灶在不使用挡风节能罩和使用铁质、陶瓷、高硅氧三种不同类型的挡风节能罩进行数值模拟计算，通过计算结果得到燃气灶燃烧空间在各种情况下的温度场。利用FLUENT前期处理软件GAMBIT，建立物理模型。由连续性方程、动量守恒方程、能量守恒方程、组分质量传输方程、K方程和ε方程组成封闭的微分方程组，通过组分传输定义边界条件，采用甲烷燃烧两步反应机理，设置稳定的松弛因子，通过分离求解器计算得出模型燃烧空间内温度场。通过计算得出燃气灶在使用三种不同类型的挡风节能罩时燃烧空间温度均比不使用挡风节能罩时要高，其中燃烧空间温度最高的为使用高硅氧挡风节能罩。利用模拟计算得出的温度场通过传热计算得到该燃气灶在不使用挡风节能罩时热效率为39.6%，使用三种挡风节能罩后热效率均有提升，最高为使用高硅氧挡风节能罩，能提升燃气灶热效率至52.6%。通过实验对比得到该燃气灶不使用节能罩时平均热效率最高为39.6%，使用铁质挡风节能罩平均热效率最高为44.2%，使用陶瓷挡风节能罩平均热效率最高为44.9%，使用高硅氧挡风节能罩平均热效率最高为52.8%。软件模拟计算和实验结果都验证了挡风节能罩在提高燃气灶平均热效率方面有良好的效果。借助对燃气灶挡风节能罩节能特性的理论与实验研究，得到为了提高挡风节能罩的节能效果，挡风节能罩的外表面材料应该选择耐高温且导热系数低的材料，内表面采用一层导热系数高的材料，并且在内壁设置一层催化燃烧的物质，同时预留一定的二次空气入口。壁厚则应先保证其耐热强度，在此之上尽量减少挡风节能罩所吸收的热量。
[Abstract]:The rapid development of global industrialization has led to a large consumption of energy, and the problem of energy shortage has become more and more obvious. Natural gas still occupies the leading position of global energy, and these three mainstream energy resources belong to non-renewable resources. Under the constant consumption, its storage capacity is becoming less and less, and energy saving has become a theme of social development at this stage. In China, gas is widely used, especially in domestic gas stoves. The average thermal efficiency of gas stoves is the main index to measure the combustion efficiency of gas stoves. The average thermal efficiency of most gas stoves in China is not high at the present stage, resulting in a large amount of energy waste. In order to conform to the social trend of global energy conservation, the research on improving the average thermal efficiency of gas stoves is also deepening. The research on energy saving of gas cooker is mainly focused on the development and design of new structure gas cooker and the auxiliary device of gas stove. In this paper, the energy saving hood of the auxiliary device of gas stove is studied, and its energy saving characteristic is analyzed. It provides the basis for the development of the wind shield with better energy saving effect. With the help of CFD software FLUENT, the numerical simulation of three different types of windshield for a domestic gas stove without using an air shield and using iron, ceramic and high silicon oxygen has been carried out in this paper. The temperature field of the combustion space of the gas stove under various conditions is obtained through the calculation results. The physical model is established by using the FLUENT pre-processing software gambit. The continuity equation, momentum conservation equation and energy conservation equation are used to establish the physical model. The component mass transfer equation K equation and 蔚 equation form a closed differential equation system. The boundary conditions are defined by component transmission, and the stable relaxation factor is set up by adopting the two-step reaction mechanism of methane combustion. The temperature field in the model combustion space is calculated by the separation solver, and the combustion space temperature of the gas stove using three different types of windshield is higher than that without the windshield. The highest temperature of combustion space is the use of high silicon oxygen windshield. The thermal efficiency of the gas stove is 39.6 when it is not used, and three kinds of windshield are used to save energy by using the temperature field calculated by simulation through heat transfer calculation. The thermal efficiency behind the cover is improved, Maximum use of high silicon oxygen windshield, The experimental results show that the average thermal efficiency of the stove is 39.6 when it is not used, the average thermal efficiency of using iron windshield is 44.2, and the average thermal efficiency of ceramic windshield is 44.2. The maximum rate is 44.9, and the average thermal efficiency of using high silicon oxygen windshield is 52.8. The results of simulation and experiment show that the windshield has a good effect in increasing the average thermal efficiency of gas stove. With the aid of the theoretical and experimental study on the energy saving characteristics of the windshield of the gas stove, it is obtained that in order to improve the energy saving effect of the windshield, the materials on the outer surface of the windshield should be selected with high temperature resistance and low thermal conductivity. The inner surface is made of a layer of material with high thermal conductivity, a layer of catalytic combustion material is arranged on the inner wall, and a certain inlet of secondary air is reserved. The thickness of the wall should first ensure its heat resistance strength. On top of this, minimize the heat absorbed by the windshield.
【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU996.75;TS914.23

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