Modeling the kinetics of methane conversion in steam reforming process of coke-oven gas based on experimental data

Steam-reforming is an effective approach for upgrading methane and hydrocarbon of coke-oven gas into CO and HE, but the kinetic behavior needs more study. We investigated the conversion of methane in coke-oven gas by steam reforming process in an electric tubular flow at 14 kPa with temperature varying from .500 ℃ to 9.50 ℃, and developed a kenetic model for, ignoring the effects of adsorption and diffusion. The optimal dynamic conditions for methane conversion 14 kPa are as follows： the ratio of the amount of water to the amount of methane is from 1.1 to 1.3; the reaction temperature is from 1 223 K to 1 273 K. The methane conversion rate is larger than 95% when the ratio of the amount of water to the amount of methane is 1.2 at a temperature above 1 223 K with the residence time up to 0.75 s.

Kinetic model on coke oven gas with steam reforming

The effects of factors such as the molar ratio of H2O to CH4 (n(H2O)/n(CH4)), methane conversion temperature and time on methane conversion rate were investigated to build kinetic model for reforming of coke-oven gas with steam. The results of experiments show that the optimal conditions for methane conversion are that the molar ratio of H2O to CH4 varies from 1.1 to 1.3 and the conversion temperature varies from 1 223 to 1 273 K. The methane conversion rate is more than 95% when the molar ratio of H2O to CH4 is 1.2, the conversion temperature is above 1 223 K and the conversion time is longer than 0.75 s. Kinetic model of methane conversion was proposed. All results demonstrate that the calculated values by the kinetic model accord with the experimental data well, and the error is less than 1.5%.

汽轮机通流部分采用可调式汽封实用效果评价

介绍了现有汽轮机采用曲径(疏齿)式汽封的特点及存在的问题,叙述了可调式(布莱登)汽封工作原理及应用情况。以实测结果为例,评价了汽封性能的优劣,不仅影响机组的经济性,而且影响机组的可靠性,并对华能大连电厂、华能沁北电厂、抚顺热电厂、大连泰山热电厂7台机组改造前、后得到的不同结果,定性分析其原因,并给出结论性评价。

自调因子模糊控制器在造气炉中的应用

介绍了造气炉生产半水煤气的工艺过程和造气机理。阐述了自调因子模糊控制器的控制方案和设计方法。通过控制系统的硬件配置和软件设计 ,对双炉并联运行采取了抗干扰措施。结果表明 ,蒸汽分解率从 3 0 %提高到 5 0 % ,且运行稳定 ,操作简单。

流媒体智能调节与控制研究

针对网上教学视频信息传输的需求,对视频传输所涉及的流媒体编码、网络带宽自适应等一些关键技术做了研究。采用两种技术相结合的方法,实现了对流媒体的智能调节和控制,解决了Internet网络环境下远程异步教学信息的传输稳定性等问题。

德士古气制甲醇存在的问题及解决措施

介绍了采用德士古水煤气制甲醇的工艺流程、装置特点和生产监控重点;分析了气体净化、甲醇合成和精馏装置存在的问题,提出了解决措施;结合生产实际,对操作中发生的事故进行了点评。

浅谈1000MW超超临界汽轮机高调阀节能优化运行

为适应电力现货市场交易,对1000MW超超临界机组主汽压进行优化和汽轮机高调阀阀序进行节能优化,实现顺序阀下高调阀最佳运行方式,达到了可调度负荷段汽轮机热耗的明显下降,取得机组电力交易竞价成本的优势。同时主汽压和高调阀阀序的改变为机组运行带来新的变化,运行人员应根据变化及时调整。

基于改进原子算法的核极限学习机热耗率预测

针对发电汽轮机热耗率模型难以精准预测的问题,提出一种改进原子算法与核极限学习机综合建模的预测方法.首先,通过提出一种动态调整搜索策略,针对原子算法全局勘探能力和局部开发能力不平衡的问题进行改进.其次,引入疯狂因子和教学策略,提高原子算法的全局搜索精度和搜索速度,避免算法早熟收敛.最后,通过某电厂汽轮机实际运行数据建立汽轮机热耗率模型,通过改进原子算法优化后的核极限学习机对热耗率模型进行预测,同时将预测结果与其他几种预测方法的预测结果进行对比验证.实验结果表明,改进后的原子算法有效提高了核极限学习机的泛化能力,提高了汽轮机热耗率的预测精度.