一种新型的全光再生节点

提出了一种能够对采用副载波复用(SCM)标签技术的光分组信号进行再生的节点结构。该节点结构简单,不用进行波长变换,可以对SCM标签信号与负载信号分别进行全光再生。仿真结果表明再生节点可以保持SCM标签信号与负载信号频谱的稳定,不会产生串扰,再生效果良好。     

Heat Saturation Time of Solid Spherical Regenerator of HTAC

In order to control the heat saturation time, the temperature field of the regenerators of high temperature air combustion （HTAC） technology after reheating furnace was studied. A one-dimensional unsteady mathematical model was established and discretized through finite difference method. The relationship between the heat saturation time and some factors was determined through the calculation of a program developed by language C. The heat saturation time decreases with the increase of heat convection coefficient, however, the increase of heat capacity, density and radius of regenerator all increase the heat saturation time approximately linearly.     

二氧化碳再生塔塔顶压力调节阀故障分析及改进

针对布朗工艺脱碳系统二氧化碳再生塔塔顶压力调节阀在生产运行中出现的问题,进行系统分析,确认阀门共振是事故多发的主要原因,采取有针对性的改进和预防措施。     

Static research of flow in rotor channels of the regenerator

One demonstrates here the results of static experiments which suggest the pulsating flow in rotating channels of the rotor of heat regenerators occurs. Electrolytic technique was used to measure distribution of the mass transfer coefficient for one of many straight, round, radial ducts of the rotor for different angle positions at mean Reynolds number as a parameter. The use of the Chilton–Colburn analogy made it possible to state the angle-distribution of flow-velocity. The Reynolds number deviation was about ±30% in comparison with its mean value which suggests that the phenomenon should be taken into account in formulating the models of rotary heat exchangers. An equality – approximately – of the mean velocity of an out-gassed electrolyte in the opposite ducts of the rotor of the model, working in a closed hydraulic system, was stated which was justified theoretically for one-dimensional flow.     

Comparative analysis of natural and conventional working fluids for use in transcritical Rankine cycle using low‐temperature geothermal source

Theoretical analyses of natural and conventional working fluids‐based transcritical Rankine power cycles driven by low‐temperature geothermal sources have been carried out with the methodology of pinch point analysis using computer models. The regenerator has been introduced and analyzed with a modified methodology considering the considerable variation of specific heat with temperature near the critical state. The evaluations of transcritical Rankine cycles have been performed based on equal thermodynamic mean heat rejection temperature and optimized gas heater pressures at various geothermal source temperature levels ranging from 80 to 120°C. The performances of CO₂, a natural working fluid most commonly used in a transcritical power cycle, have been indicated as baselines. The results obtained show: optimum thermodynamic mean heat injection temperatures of transcritical Rankine cycles are distributed in the range of 60 to 70% of given geothermal source temperature level; optimum gas heater pressures of working fluids considered are lower than baselines; thermal efficiencies and expansion ratios (Exp_r) are higher than baselines while net power output, volume flow rate at turbine inlet (V₁) and heat transfer capacity curves are distributed at both sides of baselines. From thermodynamic and techno‐economic point of view, R125 presents the best performances. It shows 10% higher net power output, 3% lower V₁, 1.0 time higher Exp_r, and 22% reduction of total heat transfer areas compared with baselines given geothermal source temperature of 90°C. With the geothermal source temperature above 100°C, R32 and R143a also show better performances. R170 shows nearly the same performances with baselines except for the higher V₁ value. It also shows that better temperature gliding match between fluids in the gas heater can lead to more net power output. Copyright © 2010 John Wiley & Sons, Ltd.     

蓄热燃烧与陶瓷球蓄热式换热器

介绍了蓄热燃烧原理，并对蓄热燃烧用蓄热体的基本要求、陶瓷球蓄热体的材质、形状、大小等进行了较深入的研究分析；给出了陶瓷球蓄热式换热器的结构参数，换向控制和换向时间、低氧高温燃烧和低NOx排放等关键技术。面对当前工业窑炉的现状，提出实施蓄热燃烧技术可使工业窑炉的热效率提高到70％－80％，节省能耗54％，有效地减少了CO2和NOx的排放，降低了环境污染。     

利用催化裂化烟气中CO生产碳酸二甲酯

提出用变压吸附法提纯催化裂化再生烟气或炼钢高炉尾气中的CO，通过甲醇液相氧化羰基化法生产DMC的工艺路线。这对提高企业经济效益，减轻环境污染，促进资源的合理利用，有重大而深远的意义。     

丙酮污染对微型机械制冷机性能影响的实验研究

设计微型高压阀直接向机械制冷机内在线、连续地添加污染杂质,提出了制冷机丙酮污染的强化加速实验方案,从量化角度深入研究了污染对回热式机械制冷机性能影响的规律.实验分析表明,随着丙酮添加量的增加,制冷能力首先稍微增强,然后在42 mg和121 mg时分别出现了性能衰变的拐点.在间歇性开机时还发现了制冷机污染效应的时延现象.结合传热、流阻等理论对实验规律进行了分析讨论,为机械制冷机的可靠性技术和寿命预测研究奠定了基础.     

催化裂化再生器外取热器分类及换热性能分析

从换热过程的内在规律出发,将已投用的外取热器分为阀控上流式、阀控下流式、气控下流式、无循环式 共４种形式;提出了热量分解概念,外取热器热量由对流热和当量“扩散热”两部分组成。已投用的外取热器中,气 控式设备效率最高,单位外取热器设备体积取热量为 ０、４５ ＭＷ／ｍ~３,其他形式为 ０．３ ＭＷ／ｍ~３,再考虑滑阀造价,气控 式投资明显低于阀控式;对应同样的流化气速和催化剂循环量,气控式能提供更高的催化剂温度及更大的换热强 度;各种取热器均可用肋片强化,肋片效率一般在０．７左右。     

流化催化裂化再生器构型的讨论

利用裂化催化剂上的烧碳动力学和化学反应工程学原理,讨论了催化剂再生的影响因素,并通过再生器的烧焦计算,重点讨论了再生温度、过程热效应、催化剂循环和再生器构型的影响。可供催化裂化装置再生器的设计和实际操作参考。