50t炼钢电弧炉烟气佘热回收系统的设计应用

以电弧炉炼钢过程烟气余热的回收利用及烟气净化除尘为主线,以热管蒸发器为换热元件,合理控制烟气流速,解决高温烟尘的沉降和蒸发器热管灰堵以及烟气温度波动大的难题,完成了50t电弧炉烟气余热回收净化系统设计与施工.对电弧炉炼钢过程中所产生的高温烟气直接进行余热回收,满足电弧炉炼钢流程VD真空处理对蒸汽的需求,实现了高温烟气余热回收利用和环境净化,为国内电弧炉节能降耗和清洁生产进行了有益的探索.     

径向热管换热器在天然气工业炉低温烟气中的应用

当前我国的能源形势紧张,能源利用状况令人担忧.在一些高耗能的企业,工业生产中排放的中低温烟气余热由于回收难度高、回收成本大等问题,一直得不到合理的利用,如何合理回收成为亟待解决的难题之一.简要介绍了一种新型余热利用换热设备——径向热管换热器,提出了计算热管换热器经济性评价指标的方法,并以某工厂低温烟气余热回收工程为实例,对烟气余热的回收利用进行了技术和经济效益分析.实践应用证明,径向热管换热器在工业低温烟气余热回收中有很好的实用性和可行性.     

空压机余热回收模糊神经网络控制算法

文中以对螺杆式空压机余热回收系统的余热回收最大化及热量精确控制为目的,首先构建余热回收系统的热力学模型,建立热平衡方程式。并针对该余热回收系统大超调量、易振荡和低控制精度的特性,设计了模糊神经网络控制算法以提高系统的控制精度和稳定性。利用matlab的simulink平台对模糊神经网络控制算法进行计算机仿真,仿真结果完全满足控制要求,而且效果良好。     

燃油注汽锅炉烟气余热回收技术

分析回收烟气预热的必要性,提出注汽锅炉烟气余热回收的方案,并通过测试分析证实了注汽锅炉烟气余热回收的效果,对回收排烟中水蒸汽潜热技术进行了介绍.     

船舶柴油机尾气热电装置热分析及结构设计

船舶柴油机具有能耗高,热效率低的特点,对尾气余热回收装置进行热分析和结构优化设计能有效提高余热回收效率.对基于温差发电的船舶柴油机余热回收装置进行热分析,提出余热回收装置的优化规律.选取工程中热电模块材质、船舶柴油机常见工况作为仿真物性,用热电模块冷热端温度差作为热电转换效率的指标.在船舶柴油机常见的温度和速度工况范围...     

大型燃煤电站锅炉典型烟气余热回收系统的性能分析

增设烟气余热回收系统是大型燃煤电站锅炉节能的有效途径.分析比较了4种典型锅炉尾部烟气余热回收系统,并结合某200MW机组参数,应用等效焓降理论及节能定量分析理论计算、比较了各种余热回收系统的经济性.分析结果表明,普通低压省煤器余热回收系统节能量最大,复合相变换热器余热回收系统性价比较高.     

热管余热回收装置在油气田燃气发动机上的应用

对热管余热回收装置的构造及工程应用进行了简要的描述,列举了在油气田生产中,利用热管余热回收装置回收燃气发动机余热的主要用途及工程实例。     

喷淋换热低温烟气余热回收供热技术及应用案例分析

传统热力供热行业是CO2排放的大户,能源的深度利用是实现"双碳"目标的有效途径之一.着重从低温烟气余热回收的角度出发,分析了低温烟气余热回收的现状,介绍了现状下不同技术路线烟气余热回收的原理.以喷淋换热低温烟气余热回收供热技术为例,结合实际工程案例,分析了实际运行数据.结果表明,采用喷淋换热进行烟气余热回收供热的技术可...     

汽车工厂空压机余热利用研究分析

对空压机余热回收利用的管路改造进行总结分类,指出有效的改造方法,并给出不同情况下空压机余热利用优先级,同时提出经济性分析时需要注意的问题。结合空压机余热回收利用的实例,并给出其控制逻辑。     

双热源集成发电系统研究

阐述了烧结工序中烧结机烟气和冷却机废气两种余热分布规律及协同回收利用原则,对立式逆流冷却机、热废气-烟气双热源余热锅炉装置、三进口余热锅炉装置及双余热源集成发电系统进行了研究,并以宝钢2号烧结余热回收系统余热源参数为基础,在烧结机烟气和冷却机废气携带热量不变的工况下,对研发的集成发电系统选定两种方案与原余热回收方案进行热经济性计算与对比分析.结果表明：双源集成发电系统两种方案的余热锅炉效率分别达到了73.4%和69.0%,发电净功率分别达到了16.40 MW和15.40 MW,研究结果可为中低品位余热高效回收装置的研发提供科学依据和技术支撑.     

Energy,exergy and economic analysis of industrial boilers

In this paper, the useful concept of energy and exergy utilization is analyzed, and applied to the boiler system. Energy and exergy flows in a boiler have been shown in this paper. The energy and exergy efficiencies have been determined as well. In a boiler, the energy and exergy efficiencies are found to be 72.46% and 24.89%, respectively. A boiler energy and exergy efficiencies are compared with others work as well. It has been found that the combustion chamber is the major contributor for exergy destruction followed by heat exchanger of a boiler system. Furthermore, several energy saving measures such as use of variable speed drive in boiler's fan energy savings and heat recovery from flue gas are applied in reducing a boiler energy use. It has been found that the payback period is about 1 yr for heat recovery from a boiler flue gas. The payback period for using VSD with 19 kW motor found to be economically viable for energy savings in a boiler fan.     

锅炉排污余热利用方法简介

大多数工业锅炉房锅炉排污基本上是直．接排放,没有采取余热回收措施,造成锅炉排污余热资源的极大浪费。介绍一种直接利用锅炉排污余热预热锅炉送风的技术方法以及应用效果。     

Comparison of the efficiency of the variants of a primary gas turbine supplementing a coal-fired power plant

Thermodynamic effects of four variants of the installation of a primary gas turbine supplementing a coal-fired power plant have been determined. The variants differ in the utilization mode of the heat recovery boiler of the gas turbine, which may be used to preheat the feed water of the steam power plant, but also for a secondary superheating of the steam. The introduction of an additional gas turbine expanding the working fluid down to a pressure lower than the ambient one with an additional compressor installed after the heat recovery boiler has been considered too. The reduction of exergy losses in the heat recovery boiler has been accepted as the main purpose of changing the scheme of the system. The new variants have been compared by means of the incremental energy efficiency of the gas turbine, characterizing the utilization degree of natural gas in the complex system.     

Consteel电炉余热锅炉的热平衡计算方法研究

针对Consteel电炉余热锅炉烟气入口参数不稳定的特点,得到了余热锅炉的各项热损失、锅炉效率、有效利用热量和蒸发量的计算公式。对65t Consteel电炉炼钢设备余热锅炉进行了热平衡计算,计算表明,锅炉的排烟热损失随烟气入口温度的降低而增加,而锅炉效率、有效利用热量和蒸发量随烟气入口温度的降低而降低,锅炉的平均蒸发量为23．1t／h。     

落丸清灰技术协助翅片管在高粘结性烟气余热回收中的应用

介绍了细粒径落丸清灰技术在翅片管余热锅炉清灰上的应用状况和技术特点,建立了冷态和热态清灰试验系统,在矿热炉余热发电系统的试用表明,对于烟尘粘度大的余热回收及发电系统,细粒径落丸可以有效解决该类系统的余热锅炉清灰问题,提高余热回收及发电水平。     

余热电站系统中的水泥窑余热锅炉简介

文章主要介绍了应用于水泥窑余热电站系统中的余热锅炉的特点及在设计、应用中应注意的问题,同时简要介绍了水泥窑余热锅炉的计算方法及一些应用于水泥行业的余热锅炉情况。     

余热锅炉管口区传热的数值分析

应用高温换热设备管口传热分析系统针对某天然气化工厂二次转化气余热锅炉管口区传热问题建立了物理、数学模型,进行了相应的数值分析。数值计算结果表明,新型双瓷管保护结构改善了管口区的传热性能。降低了余热锅炉管口区金属材料的温度,减缓了高温腐蚀反应速度;新型双瓷管保护结构同时改善了管口区域内保护套管的温度“畸变”,因而减轻管口区材料的热应力破坏。     

热管式余热锅炉的优化设计

介绍了热管式余热锅炉的主要设计参数的选定,给出了设计过程中热力计算环节的计算方法,并提出了优化方法。     

天然气锅炉改造为冷凝式锅炉的经济性评价

燃气供热锅炉排烟温度较高，带走了大量的热能。如果加装冷凝式换热器回收烟气的显热及潜热，可以大大提高锅炉效率，但是加装换热器必然增加设备成本。本文通过对冷凝式换热器设计计算，计算出不同排烟温度下的热能回收设备投资回收期，从经济上分析了天然气锅炉改造为冷凝式锅炉的可行性，并给出了锅炉最佳排烟温度。     

Analysis of two‐stage waste heat recovery based on natural gas‐fired boiler

Waste heat recovery (WHR) is crucial to the efficiency improvement of natural gas‐fired boiler systems. Two‐stage WHR systems based on the natural gas‐fired boiler were analyzed from the viewpoints of thermal efficiency and heat transfer irreversibility. An overall entransy dissipation‐based thermal resistance was derived to evaluate the irreversibility of WHR, including the entransy dissipations during condensation and in absorption heat pump (AHP). Compared with the basic WHR system, the two‐stage WHR systems have higher boiler efficiency and less irreversibility. The air‐humidified system recycles both the heat and vapor in flue gas, while the unutilized latent heat in the recovered vapor causes the boiler to be less efficient than the AHP system. Investigation on heat exchanger effectiveness of two‐stage WHR systems illustrated: in the two‐stage WHR system with air humidification, the increasing effectiveness of both heat exchangers could effectively increase boiler efficiency and reduce heat transfer irreversibility. In the two‐stage WHR system with AHP, boiler efficiency has a local optimum when the dew point occurs near the outlet of the first heat exchanger; increasing the second heat exchanger effectiveness is more efficient in improving boiler efficiency. The present work may provide available references and guidance for the design and optimization of the two‐stage WHR systems.