蜂窝蓄热体易损原因分析及其解决措施

针对加热炉采用的蜂窝蓄热体出现的问题,从材质性能、炉内实际情况、结构等方面分析出其破损原因。并设计一种新型的蓄热式烧嘴,通过热态试验对其换热性能与普通蓄热烧嘴进行了比较,表明采用这种新型烧嘴是解决蓄热体破损的有效措施之一。     

陶瓷蜂窝蓄热体在攀成钢的应用

以攀成钢线材厂蓄热式加热炉为例,针对原有蓄热室存在的问题,提出具体改进方案,完善并规范陶瓷蜂窝蓄热体的安装方法,经过实施,效果良好。     

用渐近分析法研究蜂窝蓄热体温度分布

1前言在冶金、机械和石化工业锻造炉、均热炉、连续加热炉、热处理炉、钢包烘烤炉、辐射管和熔铝炉上应用的高温空气燃烧(High Temperature Air Combustion,Hi-TAC)[1],具有热效率高、低NOx排放和燃烧放热均匀等特点。大多数的HiTAC应用了蜂窝蓄热系统[2]。温度变化和温度效率(     

蜂窝陶瓷蓄热体的热应力场数值模拟

对普通正方形格孔蜂窝蓄热体和夹角圆弧过渡正方形格孔蜂窝蓄热体的热应力场进行了数值模拟计算与对比分析.结果表明,夹角圆弧过渡正方形格孔蜂窝蓄热体的低应力区域更大,应力分布也更均匀;数值模拟结果能够指导蓄热体的结构优化设计.     

蜂窝蓄热体温度特性数学解析

基于蜂窝蓄热体气固传热精确解，研究蓄热体温度变化和切换周期设计方法，忽略沿气流流动方向的固体导热影响，建立了周期传热数学模型，并求出了气固温度分布精确解。和数值计算相比，半解析解可信，按炉内低氧稳定燃烧和蓄热体低温端不结业的要求，可进行切换周期优化设计，从而为低氧弥散燃烧设计和操控优化提供一种高效、经济、准确的解析研究方法。     

用拉普拉斯变换法求解蜂窝蓄热体气固温度分布

提出一种蜂窝蓄热体气固耦合周期传热数学解析研究方法。忽略沿气流流动方向的固体导热影响,建立了薄壁蓄热体周期传热数学模型,并对线性偏微分方程组进行无量纲化处理;借助Matlab的符号运算功能,用拉普拉斯变换法,求出了蜂窝蓄热体气固温度连续分布函数精确解,并获得了温度分布数值解;和文献纯数值计算对比,半解析结果吻合。证实高效、经济、准确地获取蜂窝蓄热体传热半解析数值解的可行性。     

蜂窝体蓄热室结构优化及软件开发

以蜂窝体蓄热室的结构优化为研究目标,模型采用的多目标优化以蜂窝蓄热体的温度效率和热回收率作为目标函数.,以空气流速,换向时间和蜂窝蓄热体的高度为优化变量,模型的计算采用线性加权法,对蜂窝体蓄热室的主要结构参数进行了优化设计,以保证气体在满足换热强度条件下,尽量减小阻力损失。并开发了蜂窝体蓄热室结构优化的软件。     

蓄热体材料的定性分析及选用

对用于旋转型蓄热式换热器蓄热体的３类材料（即陶瓷、碳素钢和耐热耐蚀钢）进行热处理参数的比较分析，提出各类材料在不同温度和环境下对换热器效率的影响和使用根据。     

蜂窝蓄热体换热特性的实验研究现状与结果分析

根据国内不同实验装置上两种格孔蜂窝蓄热体换热特性的实验研究结果,分析了相关因素与实验方法对蓄热体换热特性实验结果的影响关系,指出了实验研究对蓄热室设计与实际运行效果的重要作用。     

陶瓷蜂窝蓄热室传热性能影响因素分析

对蜂窝蓄热室的综合传热系数进行了理论计算,并分析了蓄热体各热物性参数及工况条件对综合传热系数的影响。     

某办公楼动态能耗模拟与节能分析

以eQUEST能耗模拟软件为工具,为重庆市某办公楼建立了能耗仿真模型,分析了空调设定温度、制冷机COP值、室内照明密度对能耗的影响,并对三者相应的节能潜力进行了比较分析。结果表明,建筑电耗随照明密度的减小线性降低,照明密度对建筑节能有着巨大的影响。     

Comparison of performance of heat regenerators: Relation between heat transfer efficiency and pressure drop

Heat regenerators transfer heat from one gas to another, with an intermediate storage in solids. The heat transfer surface for gas flow application should provide at the same time high surface area and low friction factor. Three geometries of heat transfer surface, monolith, stack of woven screens and bed of spheres, have been compared. Their performance was evaluated from the pressure drop of the heat regenerator working at a given heat transfer efficiency. The comparison was performed using numerical simulation and published measurements of heat transfer and flow friction characteristics. By adjusting the length and the period of the exchanger, it is possible to obtain the same heat transfer efficiency with the three geometries. Beds of spheres give very short and compact heat regenerators, working at high pressure drop. At the opposite, monoliths form long regenerators working at low pressure drop. Stacks of woven screens cover a wide range of performance: low porosity woven screens give high heat transfer efficiency and high pressure drop, while high porosity woven screens offer performance similar to that of the monoliths. Copyright © 2001 John Wiley & Sons, Ltd.     

Optimization of energy consumption and input costs for apple production in Iran using data envelopment analysis

In this study a non-parametric method of data envelopment analysis (DEA) was applied to analyze the efficiency of farmers, discriminate efficient farmers from inefficient ones and to identify wasteful uses of energy in order to optimize the energy inputs for apple production in Tehran province, Iran. From this study the following results were obtained: from the total of 56 farmers, considered for the analysis, 34% and 54% were found to be technically and pure technically efficient, respectively. The technical, pure technical and scale efficiency scores of farmers were 0.7857, 0.8982 and 0.8666, respectively. Optimum energy requirement was found to be 37993.15 MJ ha⁻¹; indicating that 11.29% of total energy input could be saved if the recommendations of this study are followed. From total energy saving, the contribution of electrical energy was the highest; it followed by chemicals energy inputs; implying that there was a great scope for saving energy inputs by improving the use pattern of these inputs. The results of economical analysis showed that the total costs of production could decreased from 8227.70 to 7570.01 $ ha⁻¹; also the benefit to cost ratio and productivity improved from 1.24 to 1.34 and 2.52 to 2.74, respectively.     

Assessing drivers of energy consumption and progress toward energy targets in Italy

ABSTRACT

The objectives of this study are to provide new insights on (i) the drivers of changes in final energy consumption in Italy over the period from 1995 to 2015 by employing a multi-sectoral decomposition analysis approach – Logarithmic Mean Divisia Index I (LMDI-I); and (ii) the progress of Italy toward the indicative energy efficiency and mandatory energy-saving targets set for 2020. The decomposition results show that from 1995 to 2015, an increase in final energy consumption caused by activity effects has been almost totally offset by structural changes. Energy intensity improvements occurred during the period from 2006 to 2015 when most of the energy efficiency policies in Italy were implemented. However, unlike the ex ante estimates of energy savings reported by the Italian government, the LMDI-I analysis shows that Italy is not on track to achieve the 2020 energy efficiency and energy-saving targets. Challenges and opportunities in policymaking are discussed.     

降低钢铁企业能源消耗的对策分析

指出了钢铁企业节能降耗的必要性,分析了武钢能源消耗现状,提出了武钢降低能源消耗的对策与途径。     

利用方法对锅炉进行节能分析

从热平衡和平衡两方面对锅炉进行能量分析,从而更全面地找出锅炉运行中所存在的问题,并提出改进措施。     

企业用能分析及空调节能方法探讨

对于不同的企业,生产工艺、规模及所消耗能源的种类各不相同,故其能耗量也不尽相同。主要针对某企业的能耗状况进行调查和分析,比较不同时间段的能源使用状况,并根据现场调查,分析造成各阶段能耗不同的原因,找出了降低产值能耗的方法。并对该企业的空调使用状况进行分析,找出仍有节能潜力的环节,提出可供参考的建议。最后,提出节能管理也是节能工作的重要组成部分。     

Impact of energy efficiency upgrade retrofits on the residential energy consumption in Canada

The impact of various energy efficiency upgrade scenarios on the annual energy consumption of the Canadian housing stock is assessed using the Canadian Residential Energy End‐use Model (CREEM). The energy efficiency upgrade scenarios that are considered include major retrofits, such as the improvement of the house envelope by adding insulation, and the replacement of the existing heating system and appliances by higher efficiency units, as well as minor retrofits, such as lighting fixture, thermostat, showerhead and aerator upgrades that reduce energy consumption. The economic feasibility of each upgrade was assessed using the indicator ‘energy savings per dollar investment’. The results indicate that the energy savings potential of the retrofits is rather small, resulting in savings of 0–8 per cent of the total energy consumption of the Canadian housing stock. Copyright © 2001 John Wiley & Sons, Ltd.