辊道窑余热应用于立式烘干器的实践与体会

针对建材工业中彩釉砖生产工艺的特点和特殊要求，自行设计、制造了一套利用辊道窑余热为干燥介质来取代立式烘干器燃用柴油作干燥介质干燥坯体的热工系统。该系统的运行完全满足了生产工艺的要求，既节约了能源，降低了生产成本，又提高了产品质量、产量。     

论铝铜冶炼和加工设备的节能

从设备的选型。生产工艺与设备技术革新和余热利用3个方面阐述了如何提高铝、铜冶炼和加工设备的节能。     

论倒焰窑余热利用

<正> 1 前言根据我国目前能源政策和生产技术结构的现状,倒焰窑还要存在较长的时间,因此,现阶段对倒焰窑余热利用的研究仍有现实意义。本文提出了利用倒焰窑余热较为合理的简易方法,既提高了余热利用率,又能较好地满足砖坯干燥工艺要求。经实际使用,工作性能良好,操作简便,管理容易,可满足生产工艺的需要,对     

余热利用简介

余热利用是指回收生产工艺过程中排出的具有高于环境温度的气态（如高温烟气）、液态（如冷却水）、固态（如各种高温钢材）物质所栽有的热能,并加以重复利用的过程。余热是在一定经济技术条件下,在能源利用设备中没有被利用的能源,也就是多余、废弃的能源。它包括高温废气余热、冷却介质余热、废汽废水余热、高温产品和炉渣余热、化学反应余热、     

铝冶炼烟气净化余热利用技术的探讨

近十几年来,我国的铝冶炼工业迅速发展,为国民经济的增长做出了重要贡献.但在冶炼铝生产过程中,会产生大量有害烟气,这种气体严重危害人类的健康,破坏生态环境.由于受经济利益的驱动,环保领域和扩大产量方面的研究工作成果较多,降低能耗方面的研究尚待深入进行.以铝冶炼烟气净化余热利用技术为研究内容,通过建立烟气净化余热利用系统,解决铝冶炼生产过程中的能源利用问题,从而实现能源再生的目的.     

水泥窑篦冷机余热发电节能改造数值分析

干法水泥生产工艺中,在回转窑篦冷机段取热进行余热发电是一种有效的节能方法。但是如何在保证不影响二次风、三次风等生产正常用风情况下,使篦冷机内熟料余热得到最大限度利用是节能改造时需要解决的难题。对某10 000 t/d篦冷机12 MW余热节能改造项目进行了数值模拟,模拟了节能改造前后篦冷机内部流场和温度场分布,分析了预计取热方式的可行性,为后续余热发电节能改造项目提供理论支撑。     

利用农村家用灶余热驱动固体吸附冰箱的可行性研究

固体吸附制冷技术是利用低品位能源的一种有效工具。本文结合吸附制冷可利用余热和农村生活用能中余热丰富这两大特性，提出了通过吸附制冷来利用农村家用灶产生的余热进行制冷这一方案，并通过分析认为这是完全可行的。     

热泵技术回收工业低温余热的探讨

面对我国日益严峻的能源和环境问题,如何提高我国工业的综合能源利用效率并降低环境污染,已成为当前亟待解决的关键问题之一. 工业中的高品质余热资源可以通过余热锅炉发电等形式进行回收;而类似于循环冷却水或低温蒸汽凝液等工业低温余热资源,因其温度低而无法直接送回生产工艺过程中,一般难以利用,多通过冷却塔与空气进行换热而排放掉这部分热能.因此,如何利用低位热源成为新的课题,而热泵技术在此课题中占有重要的地位.     

罐式炉煅烧技术

煅烧是铝用炭阳极生产中对产品质量有重要影响的工序,煅烧设备直接影响到炭阳极企业的产品质量和经济效益,对比罐式煅烧炉、回转窑和回转床,认为罐式煅烧炉具有炭质烧损低、产品质量好等优势,值得各企业推广使用.对顺流式罐式煅烧炉和逆流式罐式煅烧炉的炉体结构进行了描述,讨论了顺流式罐式炉工作原理及生产工艺,认为控制好燃料量、空气量...     

利用罐式煅烧炉烟气进行余热发电的可行性研究

我国石油焦煅烧以罐式煅烧炉和回转窑为主。罐式煅烧炉是我国最早采用的一种煅烧设备,能够煅烧不同挥发份含量的生石油焦,具有锻烧料质量稳定,炭质烧损率低,煅后焦的堆积密度高,操作简单、维护工作量小、连续生产的周期长等优点,因此广泛应用于大、中小炭素厂和铝用炭素行业中。罐式炉煅烧过程产生大量烟气,风温很高,通常高达950℃以上,供导热油炉的部分用热后烟气也有600℃。烟气热焓高,可利用其来生产蒸汽进行发电,既能有效提高企业自供电率,实现企业节能减排降耗增效,可取得良好的社会效益、经济效益和环境效益。本文介绍了罐式煅烧炉烟气余热利用发电的可行性。     

A review of the applications of heat pipe heat exchangers for heat recovery

The waste heat recovery by heat pipes is accepted as an excellent way of saving energy and preventing global warming. This paper is a literature review of the application of heat pipes heat exchangers for the heat recovery that is focused on the energy saving and the enhanced effectiveness of the conventional heat pipe (CHP), two-phase closed thermosyphon (TPCT) and oscillating heat pipe (OHP) heat exchangers. The relevant papers were allocated into three main categories, and the experimental studies were summarized. These research papers were analyzed to support future works. Finally, the parameters of effectiveness of the CHP, TPCT and OHP heat exchangers were described. This review article provides additional information for the design of heat pipe heat exchangers with optimum conditions in the heat recovery system.     

Determining the best type of heat exchangers for heat recovery

It is a common problem to choose the most appropriate heat exchanger configuration for heat recovery. In this study, a new model has been developed for determining the area and type of the most appropriate waste heat recovery heat exchanger for maximum net gain. A non-dimensional E number has been defined based on known technical and economic parameters such as the life-time, unit area cost of the heat exchanger, lower heating value of the fuel, overall heat transfer coefficient of heat exchanger, boiler efficiency, operation time per year, heat exchanger effectiveness, ratio of heat capacities, annual variation of the temperature of fluids supplied to the heat exchanger and present worth factor. The non-dimensional E numbers has been demonstrated in graphical forms as a function of NTU and ratio of heat capacities and corresponding heat exchanger area giving maximum net gain can easily be obtained from these graphs. The best heat exchanger type and its area can be determined comparing net gains or effectiveness of heat exchangers at NTU_max. Application of the new method has been given with a case study as a sample calculation.     

The heat transfer and pressure loss characteristics of a heat exchanger for recovering latent heat (the heat transfer and pressure loss characteristics of the heat exchanger with wing fin)

In recent years the requirement for reduction of energy consumption has been increasing to solve the problems of global warming and the shortage of petroleum resources. A latent heat recovery type heat exchanger is one of the effective methods of improving thermal efficiency by recovering latent heat. This paper described the heat transfer and pressure loss characteristics of a latent heat recovery type heat exchanger having a wing fin (fin pitch: 4 mm, fin length: 65 mm). These were clarified by measuring the exchange heat quantity, the pressure loss of heat exchanger, and the heat transfer coefficient between outer fin surface and gas. The effects of condensate behavior in the fins on heat transfer and pressure loss characteristics were clarified. Furthermore, the equations for predicting the heat transfer coefficient and pressure loss which are necessary in the design of the heat exchanger were proposed. ©2007 Wiley Periodicals, Inc. Heat Trans Asian Res, 36(4): 215–229, 2007; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/htj.20154     

利用热泵技术回收城市污水中的热能

阐述了城市污水热能利用的主要特点，分析了评价了把城市污水用做热泵水源的可行性，介绍了利用水源热泵回收城市污水热能的方式，讨论了城市污水源热泵系统在运动中可能存在的问题及应采取的措施。     

紧凑式两相换热器中管式换热元件沸腾传热实验研究

以烃类物质（丙烷和正戊烷）作为工质,进行了紧凑式换热器中带有加工配置表面的管式换热元件池沸腾实验研究。其中,单管实验温度工况为２５３Ｋ￣２９３Ｋ（饱和工质）。实验中所采用的换热元件为重入式结构加工配置表面的强化传热管和光管以及低助管。针对由４５根光管或带有加工配置表面的管子所构成的叉排管束进行了实验研究,实验工质为丙烷和正戊烷,实验温度分别为两种工质在２６３Ｋ和３０８Ｋ之间的饱和和温度。并将所得实     

Application of intensified heat transfer for the retrofit of heat exchanger network

A number of design methods have been proposed for the retrofit of heat exchanger networks (HEN) during the last three decades. Although considerable potential for energy savings can be identified from conventional retrofit approaches, the proposed solutions have rarely been adopted in practice, due to significant topology modifications required and resulting engineering complexities during implementation. The intensification of heat transfer for conventional shell-and-tube heat exchangers can eliminate the difficulties of implementing retrofit in HEN which are commonly restricted by topology, safety and maintenance constraints, and includes high capital costs for replacing equipment and pipelines. This paper presents a novel design approach to solve HEN retrofit problems based on heat transfer enhancement. A mathematical model has been developed to evaluate shell-and-tube heat exchanger performances, with which heat-transfer coefficients and pressure drops for both fluids in tube and shell sides are obtained. The developed models have been compared with the Bell-Delaware, simplified Tinker and Wills-Johnston methods and tested with the HTRI® and HEXTRAN® software packages. This demonstrates that the new model is much simpler but can give reliable results in most cases. For the debottlenecking of HEN, four heuristic rules are proposed to identify the most appropriate heat exchangers requiring heat transfer enhancements in the HEN. The application of this new design approach allows a significant improvement in energy recovery without fundamental structural modifications to the network.     

土壤空气换热器换热特性的模拟研究

文章针对日光温室环境下土壤空气换热器的换热特性进行了研究。首先通过监测土壤空气换热器沿程空气温度的全天变化,分析了试验工况下土壤空气换热器的动态换热过程及系统性能变化规律。研究结果表明,在试验工况下,土壤空气换热器系统的性能系数(COP)可高达24.1。在此基础上,通过建立土壤空气换热器的非稳态换热模型,模拟研究不同的入口风速对土壤空气换热器换热性能的影响。研究结果表明,当换热管入口空气温度相同时,随着入口风速的增加,土壤空气换热器进出口空气温度差逐渐减小,出口处空气温度与土壤温度差值逐渐增大,这意味着土壤空气换热器有效换热长度逐渐变长。在此过程中,土壤空气换热器系统的换热量和COP随着入口空气风速的增加呈现出先增后减的规律。通过模拟结果可知,当入口风速达到5.5 m/s时,土壤空气换热器系统的换热量与COP均达到最大值。     

竖直地埋管换热器吸排热量比对换热区温度场影响研究

以上海市同济大学土壤源热泵科学实验场工程为例,利用Feflow软件建立三维非稳态管群传热模型,按照上海典型办公建筑所要求的地埋管换热器吸排热量比(0.33,0.67和1.10)的条件,对30 a内地埋管换热器及其所处换热区的换热特性进行了数值模拟,探讨了地埋管换热器吸排热量比对换热区土壤温度的影响。研究结果表明,地埋管换热器全年吸排热量差异是影响换热区温度场分布的重要因素,当地埋管换热器全年累计吸排热量比为0.55~0.60时,有利于消除埋管区的热堆积现象。     

Experimental investigation on the heat transfer characteristics of axial rotating heat pipes

The heat transfer performance of axial rotating heat pipes was measured under steady state at rotational speeds up to 4000 RPM, or a maximum centrifugal acceleration of 170g, and heat transfer rates up to 0.7 kW. A cylindrical and an internally tapered heat pipe with water as the working fluid were tested with different fluid loadings that ranged from 5% to 30% of the total interior volume. The measurements were used to characterize the effects of rotational speed, working fluid loading, and heat pipe geometry on the heat transfer performance. The internal taper on the condenser was found to significantly increase the heat transfer rate compared to the cylindrical case. A comparison between the test results and predictions from previous models showed that natural convection in the liquid film at the heat pipe evaporator plays an important role in the heat transfer mechanism at high rotational speeds.