美国善能MBC—1805精密珩磨机床的电气控制

一、MBC-1805的六种操作方式 1、人工启动、人工冲程珩磨、人工停机。 2、人工启动、机动冲程珩磨、人工停机。 3、人工启动、零位停机。 3、按钮启动、零件停机。 5、人工启动、尺寸自动控制停机。 6、按钮启动、尺寸自动控制停机。     

江西省工业锅炉节能降耗问题的研究

高耗能特种设备包括锅炉、换热压力容器、电梯、起重机械等。其中工业锅炉数量多，占能耗比重大，最具节能潜力。工业锅炉使用范围广，涉及的管理环节多、设计、制造、安装、修理、改造、使用、检验七个环节基本都与节能降耗有关。因此，工业锅炉的节能降耗必须统筹兼顾，全面协调，实施全过程控制。     

《太阳能学报》稿约

1本刊为新能源和可再生能源领域综合性学术期刊(月刊),报导我国太阳能、风能、生物质能、海洋能、地热能及氢能等科学技术研究成果,登载原创性的学术论文、研究报告、实验仪器和实验技术等。2文稿要求观点明确、数据可靠、言简意明、重点突出。文稿必须细致地核对,做到齐、清、定。3文中的计量单位一律采用《中华人民共和国法定计量单位》。     

广东省地热资源现状及开发前景展望

温泉是集热、矿、水三位于一体的宝贵矿产资源。其属性单一，为矿产资源中的能源矿产类。广东省的温泉分布甚广，全省已发现温泉311处、温泉点294处、隐伏地热区17处。其中，粤东地区主要分布在丰顺、东山湖、普宁、紫金和惠州地区；粤中及南部主要分布于三元里、龙门、从化、中山及珠海地区：粤西主要分布于思平、吴川、阳江等地；粤北主要分布于枫湾、曲江、小坑、清远、英德等地。     

书讯

<正>《节能减排培训教材》是一套内容实用、知识权威、观念先进,具有针对性、系统性、适用性的节能培训教材。该书于2008年底出版,共分三册。第一册为"政策法规篇",包括法律、法规、规章、法规性文件、规划及部分地方规章、政策文件、规划等。第二册为"节能技术篇",系统介绍节能基础知识、电、热、水、新能源技术、锅炉节能、公建节能等专业知识,并选择具有代表性的案例进行讲解。     

《太阳能学报》稿约

1本刊为新能源和可再上能源领域综合性学术期刊(月刊),报导我国太阳能、风能、生物质能、海洋能、地热能及氢能等科学技术研究成果,登载原创性的学术论文、研究报告、实验仪器和实验技术等。2文稿要求观点明确、数据可靠、言简意明、重点究出。文稿必须细致地核对,做到齐、清、定。3文中的计量单位一律采用《中华人民共和国法定计量单位》。     

菱铁矿

菱铁矿是铁的碳酸盐矿物,成分为FeCO3。菱铁矿属于三方晶系,晶体呈菱面体,晶面往往弯曲。集合体呈粒状、块状或结核状,亦有葡萄状和土状者。显晶质球粒状的称球菱铁矿,隐晶质凝胶状的称胶菱铁矿。菱铁矿莫氏硬度3.75~4.25,有白色条纹和玻璃光泽或珍珠光泽。热液成因的菱铁矿常见于金属矿脉中,与重晶石、萤石、方铅矿以及其他矿物是相关的。沉积成因的菱铁矿常见于页岩层、黏土层和煤层中,在氧化带易水解成褐铁矿,形成铁帽。菱铁矿常呈结核体或放射状球粒结构的菱铁矿产出,铁的硫化物包括黄铁矿和白铁矿。其常见的共生矿物有:石英、黄铁矿、褐铁矿、针铁矿、黄铜矿、闪锌矿、冰晶石、方铅矿、重晶石、方解石、白云石、萤石等。     

能源经济学

能源是人类社会赖以生存和发展的重要物质基础。能源在其开发利用过程中,存在着诸如市场、价格、供求关系等各种各样的经济现象,它与人们的日常生活及社会的经济发展息息相关。能源经济学正是在这种背景下发展起来的1门年轻的科学。能源经济学研究能源生产、交换、分配、消费过程的经济关系和经济规律的学科。能源经济学为国家和地区制定有关能源工业发展的方针、规划、政策提供理论依据。能源经济学将是包含能源的需求、能源的定价机制、能源     

国内外内燃机车技术水平的比较(下)

简要回顾了我国铁路牵引动力改革的成就 ;对国内外内燃机车的技术水平进行了比较。比较的重点是 :国内外机车车辆的运用强度 ;内燃机车的性能参数、经济性、可靠性和耐久性。对国内外内燃机车及内燃动车的主要部件和系统的技术水平进行了比较。比较的重点是 :柴油机、增压器、电传动系统、液力传动系统、走行部、辅助系统和微机控制系统。通过比较 ,找出国产内燃机车、内燃动车及其主要部件及系统与国外先进水平的差距。     

征稿启事

本刊对政府能源管理部门及机电、锅炉、电力、环保、冶金、化工、建筑、煤气、制冷与空调等行业以及科研与设计机构、高等学校的有关领导、管理人员、工程技术人员、教师及研究生具有一定的实际应用和参考价值。欢迎踊跃来稿。     

过热器减温水过量的治理改造与实施效果

针对某电厂5号锅炉实际运行过程中存在的过热器减温水过量的问题,提出了4种受热面改造方案,通过对4种改造方案热力计算结果的对比分析,最终选择方案A对锅炉尾部受热面进行了初步改造.改造后的实际运行和性能试验数据表明:在不同负荷工况下,过热器减温水总量明显下降,平均下降约100 t/h;省煤器出口欠焓在允许范围内,保证了锅炉水循环的安全性;机组整体的经济性、安全性及可调性都得到提高,改造取得了圆满成功.     

Evaluation of retrofitting gas-fired cooling and heating systems into BCHP using design optimization

The influence of energy prices on the feasibility of a retrofit is investigated. The retrofit describes the conversion of a system from HVAC to BCHP for energy-saving. This includes two optimal retrofit design models, of which the exergetic efficiency and annual costs (AC) are the separate objective functions. The retrofit scheme is planned to insert gas engines as prime movers into the original system, which have adopted gas-fired absorption chillers. The solutions of the optimizations show that such a retrofit can result in a remarkable rise in exergetic efficiency but is not viable with current energy prices. The contradictory solutions reveal a gap between the current energy prices system of the country and the present energy situation. Further investigation gives the critical lines of which each divides the coordinate plane of natural gas–electric prices into two parts of benefit and deficit. If the electric price rises to a certain extent, the retrofit will be advantageous both in benefit and energy-saving. So it is really an urgent task to reform the energy prices system in China. Conclusions may be helpful for other similar retrofit projects, and for legislators and the government which are responsible for improving the energy market in China.     

常熟电厂#1机汽轮机电液控制系统（DEH）简介

简述了常熟电厂＃１机汽轮机控制系统ＤＥＨ改造的情况。在现有设备的基础上,采用低压油电调方式,以最少的改造费用,最短的改造周期,达到与高压油系统相当的控制水平,为国产３００ＭＷ汽轮机调改造低压油模式走出一条新路。     

天津大港发电厂#3锅炉改造

本文介绍了天津大港发电厂#3锅炉概况 ,改造原因 ,改造目的和改造的范围 ;预测改造后的运行性能和特点。该工程改造成功对电厂安全运行和提高经济效益具有重大的意义     

Global algorithm for systematic retrofit of tubular process furnaces

Tubular process furnaces are widely used especially in the chemical and petrochemical process plants and refineries. Retrofit of a furnace is usually recommended for increasing plant capacity or improvement of the furnace (and/or plant) energy efficiency. Many different constraints of existing furnace design and operation are the reasons for which the retrofit of a furnace is a very difficult task. Main operational and geometrical constraints are taken into account in furnace retrofit integration approach created earlier. This approach was developed primarily for improvement of the furnace energy efficiency. When furnace retrofit for increasing the plant capacity is performed additional criteria have to be considered. Then fluid hydrodynamic behaviour plays an important role and influences the retrofit strategy. This problem is discussed in the paper and results in suggestion of the global conceptual algorithm for furnace retrofit strategy. Practical case studies demonstrate applicability of the proposed global furnace retrofit algorithm.     

Technology line and case analysis of heat metering and energy efficiency retrofit of existing residential buildings in Northern heating areas of China

The building area in northern heating areas accounting for 70% of the total land area in China is 6,500,000,000 m². The average heating energy consumption in northern China is 100–200% times more than developed countries in the same latitude. This paper introduced firstly the heat metering and energy efficiency retrofit background of existing residential buildings in northern heating areas of China organized by mohurd and MOF, and then put forward the total principle and contents of retrofit. Through analyzing some retrofit cases in Germany, Poland and China, some technological experiences were summarized and finally a technology line suitable for heat metering and energy efficiency retrofit of existing residential buildings in northern heating areas of China which involved retrofit for heat metering and temperature regulation of heating systems, heat balance of heat source and network, and building envelope was described to provide a systematic, scientific, technological guide for the retrofit projects of 0.15 billion m² in “the Eleventh Five-Year Plan” period.     

Plant energy saving through efficient retrofit of furnaces

Tubular process furnaces belong to energy demanding equipment in the process industry, especially in the chemical and petrochemical process plants and refineries. Several ways of energy saving in such plants usually exist. Retrofit of furnaces can be considered as one of the straightforward and efficient ways. However, operational and geometrical constraints of an existing furnace are the reasons due to which the retrofit of a furnace is a very difficult task. Therefore, the process retrofit is usually focused on heat exchanger network (HEN) retrofit considering maximum furnace duty. Nevertheless, the furnace retrofit should be considered wherever possible. In some older plants, the placement of new shells or topology changes in HENs can be expensive due to various reasons and only minimum topology modifications are usually allowed. The furnace retrofit procedure described in this paper is based on an advanced furnace integration approach using some principles of Pinch Analysis and considering furnace limitations. It can bring surprising results. This method combines principles of an effective design of both processes and equipment. An efficient methodology for furnaces retrofit, using optimization of both stack temperature and air preheating system, is applied. An advantage of this approach is demonstrated through a case study — retrofit of furnace in petrol hydrogenation refining plant for energy efficiency improvement.     

高压变频技术在凝结水泵调速改造中的应用

结合嘉兴电厂4号机组凝结水泵变频调速改造项目,从装置选型、动力方案、控制逻辑、经济性等几个方面进行了分析和总结,对其"功率单元旁路"和"工频旁路"提出了改进意见,并给出了设备改造及运行方面的建议.采用高压变频技术对凝结水泵进行调速改造后,降低了母管压力,实现了"软启停",延长了系统寿命,取得了较明显的经济效益,对大容量电机变频改造具有一定的参考价值.     

合同能源管理在医院建筑节能改造中的应用

既有建筑开展节能改造是我国现阶段落实节能减排目标、实现可持续发展的关键工作内容之一。合同能源管理作为一种新兴的节能改造商业模式,可以充分调动用能单位开展节能改造的积极性,并充分利用市场资源,最终有效落实节能减排目标。对合同能源管理的概念内涵、发展现状、扶持政策、改造技术以及常见的商业模式进行概述,并以实际的医院建筑改造项目为案例,对其采用合同能源管理的改造方案、商业模式以及风险管控进行介绍,旨在为我国的公共建筑特别是医院建筑的节能改造提供参考依据。     

浅析汽轮机通流部分改造对辅机性能的影响

汽轮机通流部分改造是否可以达到预期效果在某种程度上取决于辅机系统对改造的适应性,因此分析与探讨关键辅机的适应性对确保机组增容改造后的安全经济运行具有重要意义.以某型300MW汽轮机的通流部分改造为实例,分析其部分辅机设备主要参数在改造前后的变化趋势,重点讨论关键辅机在汽轮机通流部分改造后其固有特性对机组性能的潜在影响,进而为优化改造方案提出建议,以期为同类机组增容改造提供参考.