共查询到20条相似文献,搜索用时 203 毫秒
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对中国石化安庆分公司催化裂化装置三机组烟气轮机组在MIP技术改造后的运行状况进行分析,总结出影响烟机能量回收的因素,并提出了通过采取优化烟机操作、增加入口烟气量、减少烟气管道温度损失以及对辅助系统进行改造等措施,来提高烟机运行效率的方案。 相似文献
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介绍了YL-25000A型烟气能量回收机组主要技术性能指标及操作参数。分析了机组在运行中存在的主要问题,及机组实际值与设计值的功率平衡问题,并进行了数据核算。分析表明,机组烟气流通能力、绝热效率及功率均达到设计要求,且主风流量超过4850m3/min(标准)后电机功率会随主风机量的增加而线性上升。 相似文献
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低温余热双循环发电系统的设计与优化 总被引:1,自引:1,他引:0
采用螺杆膨胀机双循环系统回收低温余热用于发电,拟合有机工质R245fa的热物性参数进行热力设计计算,并提出2种确定蒸发温度的方法,对单位质量的热源,分别以系统净功率、系统效率为优化目标,结合热力学第一定律与第二定律评价2种方法的优劣性.结果表明:随着蒸发温度的升高,存在最佳蒸发温度使得系统净功率最大,而系统热效率逐渐提高;系统净功率最大时,系统对余热能量回收较大,且回收量最大,故选择以系统净功率为目标作为蒸发温度的优化方法;基于蒸发压力恒定不变,证明了余热回收热量、系统净功率和系统效率随着过热度的增加而减少,应尽量采用饱和状态蒸气动力循环. 相似文献
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本文介绍了能量回收机组在实际生产中实现平稳经济运行的注意事项,主要从日常操作、烟气质量控制、烟气参数控制、防喘振及防逆流保护等几方面进行了总结,为机组实现经济平稳运行提供了较好的经验. 相似文献
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以烟气脱硫系统为例,从设计、运行的角度分析了污染物减排中节能技术。提出,系统设计中选择合适的烟气流速、优化吸收塔内流场分布、对于不设GGH的脱硫系统将增压风机和引风机合并,并设置低温烟气热能回收装置,对于脱硫系统节能具有很重要的意义。 相似文献
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针对常规电站锅炉余热利用系统中低温省煤器入口烟气温度的限制,对锅炉尾部受热面进行综合优化,将空气预热器分两级布置,在两级空气预热器之间布置低温省煤器;并通过改变Ⅱ级空气预热器出口空气温度,优化低温省煤器所处的烟气温度范围,从而得到热力学最优工况;最后结合技术经济性分析,得出符合工程实际的综合优化结果.结果表明:通过空气预热器分级设计和合理设定关键运行参数,在热力学最佳方案下机组供电煤耗降低约6.7g/(kW·h),结合技术经济性分析,在年平均运行5 500h工况下,每年净收益可达2 100余万元,经济效益显著. 相似文献
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转炉烟气余热回收系统将转炉烟气的余热资源充分回收,使之转化为可以利用的蒸汽,经济效益显著。介绍了某钢铁厂120 t转炉烟气余热回收系统的工艺设计要点。该系统自投运以来,整个生产过程运行稳定,各项指标均达到设计要求。 相似文献
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冷热电联供系统主要应用于大型集中性供能系统中。作为分布式能源的一种,冷热电联供系统具有节约能源、改善环境、提高电力综合效益的优势。一般情况下,三联供系统是以天然气为燃料带动燃气轮机、微燃机或内燃机发电机等燃气发电设备运行,产生的电力供应用户的电力需求,系统发电后排出的余热通过余热回收利用设备(余热锅炉或者余热直燃机等)向用户供热、供冷。通过这种方式提高整个系统的一次能源利用率,实现能源的梯级利用,还可以提供并网电力作能源互补,经济收益和效率均得以提升。研究较为常见的燃气轮机中的一种蒸汽型吸收式冷热电联产系统,对不同配置方式和运行方式进行横向与纵向交叉比较,以完成系统优化研究。 相似文献
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Petr Stehlik 《传热工程》2013,34(5):383-397
Heat recovery systems play an important role in waste to energy and biomass processing. An efficient approach that follows a recommended hierarchy in design, process as a whole (e.g., incineration) → subsystem of the process (e.g., heat recovery system) → equipment (e.g., air pre-heater), is shown. Important factors have to be taken into consideration in processes for incineration (combustion of biomass), especially available energy, specific features of hot process fluid (flue gas), type of waste/biomass, fouling, and environmental impact. A combination of intuitive design, know-how, and a sophisticated approach based on up-to-date computational tools is shown. Some novel types of heat exchangers (e.g., air preheaters for high- and low-temperature applications, heat recovery steam generators and/or heaters, and those for specific applications) that can be substituted for conventional ones are presented. An improved or even optimum design of heat exchangers requires computational support in the following areas: a simulation based on energy and mass balance, the thermal and hydraulic calculation of heat exchangers, a CFD (computational fluid dynamics) approach, optimization, and heat integration. Some examples are presented. An approach that ranges from an idea to an industrial application is demonstrated on the novel design of integrated compact equipment (combustion chamber installed inside heat exchanger) for the thermal treatment of waste gases, including heat recovery. This approach involves simulation for obtaining basic process parameters, thermal and hydraulic calculations, design of experimental facility, the manufacture of the equipment and building of this facility, operation and functionality testing, data acquisition for validating and improving the CFD model, and the utilization of feedback from industrial applications. 相似文献
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设备容量优化和运行策略优化是分布式能源系统设计,运行的关键问题。为实现分布式能源系统的经济效益,能效水平和环境效益最大化,针对楼宇型分布式能源系统建立了相对普适化的物理模型和数学模型,以粒子群优化算法和线性规划相结合,采用两阶段优化方法计算系统的最优容量配置,并给出运行策略。以某写字楼的分布式能源系统为例,得到最优的系统设备容量和全年逐时运行策略,并采用遍历法验证计算结果的准确性。优化的分布式能源系统与传统供能系统相比,费用年值降低7.79%,年总能耗降低24.18%,污染物排放量减少了62.77 %。 相似文献
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Kanubhai K. Parmar Kutub Ujjainwala Sukanta K. Dash 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2018,40(23):2773-2784
Steam cracking is a fundamental application of olefin production which is the building block of petrochemical complex. Continuous efforts are being made to optimize the cracker performance by process-side optimization. The cracker furnace flue gas, which has a huge quantum of low-grade energy, is getting lost from the stack; a waste heat recovery system is being employed to generate ow-pressure steam. This also helps in the reduction of induced draft fan suction temperature. However, if there are no low-pressure steam consumers, the steam requires to be vented or partial heat recovery to be done. The lower heat recovery through waste heat recovery boiler restricts the cracking furnace throughput due to a higher suction temperature of the induced draft. A detailed steam network study has been done for a petrochemical complex having various downstream plants to maximize heat recovery as well as furnace throughput. For any equipment in question, to use a lower steam, it was a challenge to switch over from relatively higher-pressure steam to lower-pressure steam due to equipment design consideration as well as operating temperature requirement of any process. Different alternatives were thought of and evaluated based on process requirement, possibility of steam venting of other level steam, and cost of modifications. The outcome of this study has helped to utilize the low-pressure steam. The study indicated that for optimization of cracker performance, in addition to process side, there is a scope to improve on flue gas side operation also. 相似文献