共查询到19条相似文献,搜索用时 789 毫秒
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两级烟气废热热管溴化锂制冷机稳态仿真 总被引:2,自引:1,他引:1
利用热管废热溴化锂制冷机不仅能够回收工业过程的大量废热、余热,而且可以提高整个工业系统的能源利用效率。针对两级烟气废热热管溴化锂吸收式制冷机,编写了溴化锂制冷机的设计计算程序和变工况的仿真计算程序,主要研究外界参数变化对系统性能的影响,其结果与理论分析能较好得吻合。对溴化锂制冷机的设计及操作运行、控制调节等具有一定的指导意义。 相似文献
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废热溴化锂制冷机可以直接利用烟气废热或化学反应热来驱动进行制冷,因此废热回收的综合利用率比较高。论文对烟气废热驱动废热溴化锂制冷机的热能利用的经济性进行了分析,在烟气废热驱动溴化锂制冷机中,溴化锂制冷机的COP仅仅反映的是溴化锂制冷机本身的性能,不能作为衡量废热溴化锂制冷机废热制冷的效率高低和性能好坏的标准,因此本文采用废热利用率和废热制冷率对烟气废热溴化锂制冷机的废热制冷性能指标,废热制冷率与炯效率分析结果相一致,通过比较发现,二级烟气双效废热驱动废热溴化锂制冷机的废热制冷率最高,炯效率也最高。 相似文献
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利用热管废热溴化锂制冷机不仅能够回收工业过程的大量废热、余热,而且可以提高整个工业系统的能源利用效率。针对两级烟气废热热管溴化锂制冷机发生器的结构特征,建立了动态数学模型,进行了数值求解,得出了机组启动过程中发生器的各参数的变化规律。结果表明:蒸汽发生量与溶液出口温度基本同步稳定,烟气中间为250℃左右,出口温度为200℃左右。此研究对减短启动时间、节约能源具有一定的积极意义。 相似文献
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在联产系统能量和物质转换过程模拟和分析的基础上,重点研究了热功转换过程及其与甲醇合成过程的相互影响.得到部分联产率对系统输出功、甲醇合成压缩机耗功、甲醇产量、合成塔副产蒸汽的影响.并对比了动力独立生产系统和部分联产系统供电效率. 相似文献
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本文针对传统焦炭生产工艺的不足、并应用联产系统整合思路,研究提出新型焦炭动力联产系统.新系统取消了传统炼焦工艺中直接燃用焦炉煤气为炭化室提供炼焦热量的方式,采用外置煤炭燃烧室提供热量,从而实现用低品质煤炭替代高品质焦炉煤气;节省下来的富氢、高热值的焦炉煤气作为燃料提供给联合循环,实现高效洁净发电;改进炼焦过程烟气废热回收方式,使得排烟损失大大降低.分析结果表明,新系统具有优良的热力性能,相对节能率高达15%左右.对系统关键过程的图像(火用)分析分析表明,燃烧过程和换热过程等变革与改进是系统性能提升的关键所在.本文研究将为冶金生产的可持续发展提供新思路与新系统方案. 相似文献
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窄点设计法在功、热联合系统中的应用 总被引:1,自引:0,他引:1
余热利用是节能的重要途径。化工、炼油和冶金等企业中通常有若干股余热流拥有大量余热,一部分可在工艺过程中加以利用,另一部分可作为动力回收的热源。许多设计方法把热利用和动力回收两者隔裂开来,首先着眼于热利用,然后再考虑动力回收。这种方法可以对热利用和动力回收系统分别进行优化,但从总体上未必能达到最优目标。八 相似文献
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我国工业余热资源丰富,尤其是中低温余热具有巨大的回收利用潜力。本文提出采用热耦合多级自由活塞斯特林发电机来构建余热回收利用系统,可有效拓宽余热利用温度范围,减小余热热源传热损失。首先基于热声理论,从声阻抗角度计算考察了单级自由活塞斯特林热电联供系统在变温和变充气压力等工况下的性能;然后对一台三级自由活塞斯特林热电联供系统进行解耦计算,分别考察了供水温度、单级加热量、工作压力等因素对系统性能的影响;最后开展了实验研究,在420/350/300℃热端温度及22/22/18 kW加热量下获得自由活塞斯特林热电联产系统净输出电功10.09 kW,供热量45.29 kW,对应总热电效率为16.27%,综合热利用率为89.32%,各级相对卡诺效率分别为30.90%、32.10%、36.08%,展现出重要的应用前景。 相似文献
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《Heat Recovery Systems and CHP》1995,15(4):333-346
The Thermosyphon Rankine Engine (TSR) is a recent concept for power generation using solar or other available low grade heat sources. The basis of the engine is the modification of a heat pipe, with its excellent heat and mass transfer characteristics, to incorporate a turbine, thereby making the system into a Rankine Cycle Engine.The TSR is directed towards power production from solar ponds, geothermal energy and heat produced by solar collectors, as well as for waste heat utilisation for electrical power generation.A theoretical formulation and results from experiments on prototype units are presented. Based on the results, it is concluded that the TSR engine may play an important role for conversion into electrical energy of thermal energy produced by conventional solar collectors, geothermal sources and waste heat. 相似文献
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Hoon Kim Sung-Geun Park Buyoung Jung Junphil Hwang Woochul Kim 《Applied Physics A: Materials Science & Processing》2014,114(4):1201-1208
Low-quality heat is generally discarded for economic reasons; a low-cost energy conversion device considering price per watt, $/W, is required to recover this waste heat. Thin-film based thermoelectric devices could be a superior alternative for this purpose, based on their low material consumption; however, power generated in conventional thermoelectric device architecture is negligible due to the small temperature drop across the thin film. To overcome this challenge, we propose new device architecture, and demonstrate approximately 60 Kelvin temperature differences using a thick polymer nanocomposite. The temperature differences were achieved by separating the thermal path from the electrical path; whereas in conventional device architecture, both electrical charges and thermal energy share same path. We also applied this device to harvest body heat and confirmed its usability as an energy conversion device for recovering low-quality heat. 相似文献
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《Heat Recovery Systems and CHP》1995,15(1):13-17
An endoreversible Carnot cycle is presented in this paper for a heat engine using higt-temperature waste heat. The endoreversible Carnot cycle is a modified Carnot cycle, where the heat-transferred between the heat engine and its surroundings is the only irreversible process. Since the energy input (waste heat) to the heat engine is free, the cost of the output power of the heat engine depends mainly on the size of the heat exchangers. A specific power, power per unit area of heat exchanger surface area, is adopted as the objective function for the performance analysis of the heat engine. The relation between the maximum obtainable specific power and the temperature range in which the high-temperature waste heat engine operates is found. 相似文献
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《Heat Recovery Systems and CHP》1991,11(5):335-339
This paper presents a discussion on energy and development with reference to India and brings into focus the importance of small power units (30–300 kW) fuelled by agroresidues and industrial waste heat. It examines the present status of these units and points out that the steam based systems excel over others in such features as conversion efficiency, robust operation and maintenance. The design and performance characteristics of steam based units developed at the Australian National University are outlined; the technology has been operational for about 10 years using steam generated by solar collectors. The nett present cost (NPC) calculations show that the commercial unit is likely to be significantly less expensive for periods over 6 years. 相似文献
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《Journal of Electrostatics》2007,65(3):182-188
Large amounts of low-grade heat are emitted from various industries and wasted into the environment. This heat energy can be used as a free source for pyroelectric power generation. We first discuss the principle of pyroelectric conversion based on the differences in crystal structures of copolymer. Then we discuss the pyroelectric conversion of waste heat using copolymer films containing 60% vinylidene fluoride (VDF) and 40% trifluoroethylene (TrFE) and the impact of the preconditioning of the pyroelectric films on the net power output. We discovered that the pre-polarization (poling) of pyroelectric films has a significant beneficial effect by decreasing internal conduction during power conversion. This in turn increased net power output. We were able to reach 95–165 J/L of copolymer used in each cycle even including the internal leakage. We also showed it is critically important to operate the power conversion near the phase transition where electron discharge is the highest. 相似文献
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