共查询到19条相似文献,搜索用时 250 毫秒
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为提高蒸汽管网仿真计算、辅助调度、故障诊断等理论的实用性,基于管网水力热力联合计算模型,提出了一种基于改进遗传算法的蒸汽管网压降系数辨识方法。实例验证表明,该方法有效提高了管网计算模型的计算精度,增强了其解决实际工程问题的能力,对提高企业节能效果、加快流程工业节能减排建设具有一定的指导意义。 相似文献
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针对钢铁企业蒸汽管网压力变化波动大且存在流量数据随机缺失和异常等因素导致的难以对蒸汽系统进行实时有效调度的问题,提出了一种基于数据填补-最小二乘支持向量机(least squares support vector machine, LSSVM)的蒸汽管网压力预测方法。首先利用基于近邻噪声处理的K近邻缺失数据填补算法(eliminate neighbor noise K-nearest neighbor, ENN-KNN)对蒸汽流量原始数据进行异常点和缺失点填补,以降低数据中的异常点干扰;然后通过选取影响蒸汽管网压力的主要蒸汽发生和使用用户,包括煤精、海水淡化、烧结、干熄焦和炼钢等,利用LSSVM算法建模,对蒸汽管网压力进行预测。试验结果表明,基于本文所提方法的钢铁企业蒸汽管网压力的预测精度高、建模速度快,具有良好的抗干扰性和实用性,可以为蒸汽的合理调度提供科学的理论依据。 相似文献
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邯钢2800mm中厚板轧机优化规程研究 总被引:1,自引:0,他引:1
优化轧制规程计算及实现的基本数学模型,由优选轧制压力公式,变形抗力,温降模型参数和精确弹跳方程构成。通过计算机模拟实验比较主要压力公式的Qp值,优选出该轧机的实用压力公式,变形抗力和温降模型参数非线性估计方法,提高了压力预报精度;反映板宽因素的非线性弹跳方程,是提高辊缝设定精度的关键。通过实测轧机横向刚度的轧制方案,优化轧制规程和不同终轧道次轧制压力规程的设定计算,并在轧机上实验,证明所研制的方法 相似文献
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根据对蒸汽流量产生误差的分析,阐明了流量系数,流体膨胀系数以及蒸汽密度、温度、压力关键要素,对流量测量的影响。根据对饱和蒸汽、过热蒸汽流量测量的特点,分析减少流量测量误差所采取的修正方法,并推导出饱和蒸汽压力补偿,过热蒸汽压力、温度补偿的数学模型。介绍了微机流量测量及自动补偿在我厂的实际应用效果。 相似文献
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针对某钢铁联合企业低热值煤气燃气一蒸汽联合循环余热锅炉在实际运行中蒸汽参数达不到设计要求和余热利用率低等问题,对其汽水参数和进出口烟气参数进行了热工测试,并分析了燃气轮机排气温度、流量、背压、锅炉给水压力、节点温差、接近点温差、热端温差等因素对汽水参数、排烟温度及排烟阻力的影响。结果表明,影响联合循环余热锅炉热力性能的主要因素有燃机排气参数和余热锅炉综合传热系数。建议根据实时监测的燃气轮机排气温度和流量,选取与之匹配的给水压力、热端温差、节点温差和接近点温差;制定合理的烟气侧吹扫和清洗制度,执行严格的给水标准,保证换热面高效换热。 相似文献
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介绍蒸汽喷射真空泵的极限压力、流量、抽气速率等各项性能参数、特性曲线、工作原理及结构组成,并结合生产实际情况确定各项参数,通过严格计算,设计出与生产相匹配的蒸汽喷射泵,提高蒸发器的产能和运转周期,降低各项消耗。 相似文献
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Cheng-Hsiung Huang Chuen-Jinn Tsai Yu-Min Wang 《Canadian Metallurgical Quarterly》2007,133(4):454-461
An efficient venturi scrubber system combining a particle growth device and a traditional venturi scrubber was designed and tested in the laboratory. Before the venturi scrubber, saturated steam at 100°C was mixed with normal temperature waste stream to achieve supersaturation conditions allowing submicron particles to grow into micron sizes. Hence the control efficiency of submicron particles was greatly enhanced at a reasonably low pressure drop as compared to that found in the literature. At a flow rate of 250?L/min and a liquid to gas ratio of 2.5?L/m3, the control efficiency of the present venturi scrubber system for NaCl particles greater than 100?nm is greater than 90%, and pressure drop is only about 44?cmH2O (4.3?kPa). In comparison, to remove only 50% of 0.6?μm particles at the same liquid to gas ratio, the pressure drop needed will be greater than 200?cmH2O (or 19.6?kPa). Theoretical calculation has also been conducted to simulate particle growth process and the control efficiency of the venturi scrubber considering the effects of mixing ratio (ratio of steam to waste stream by mass flow rate) and particle diameter. Theoretical results using Calvert’s theory (1970) were found to agree well with the experimental data for NaCl particles greater than 50?nm, and for SiO2 particles greater than 150?nm. 相似文献
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主要介绍了有色金属加工厂采用二氧化碳灭火系统的必然性和二氧化碳的物相图,轧机区、主地沟、工艺地下室、板式过滤机四大保护区各采用何种灭火方式,以及各区CO2设计用量的计算方法、应用条件、联动关系,还介绍了喷头布置、管路布置、流量计算、管路压力降计算方法等及注意事项。 相似文献
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介绍多功能天车液压站的组成及工艺要求;以打壳快速下降为例,论述液压系统工作过程;介绍液压系统无压力故障时的检查方法,分析造成液压系统无压力的原因,提出相应的预防措施。 相似文献
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多孔介质换热元件的流动特性研究 总被引:3,自引:0,他引:3
对几种非均匀孔隙的多孔介质换热元件进行了冷态实验,得到流动阻力与流速的经验关系式,基于冷态实验,建立多孔介质系统的能量平衡模型,通过数值模拟,得到系统内部压力曲线;将冷态实验的结果推广到了非等温系统,并讨论了流量,温度场,组成多孔介质物质的形状,流通长度等因素对阻力损失的影响。 相似文献
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根据《锅炉机组热力计算标准方法》对某250dd生活垃圾炉排焚烧炉及其余热锅炉进行热力计算,提出系统黑度和烟气黑度的修正方法.讨论火焰中心高度系数、灰污系数对燃烧室烟气心口温度影响。同时,也对烟气侧辐射换热系数、横向冲刷错列管束系数和换热总系数的算法进行了讨论。 相似文献
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Optimal Design of Pressurized Irrigation Subunit 总被引:1,自引:0,他引:1
Ravindra V. Kale Rajesh P. Singh Pooran S. Mahar 《Canadian Metallurgical Quarterly》2008,134(2):137-146
A linear programming (LP) model is presented for optimal design of the pressurized irrigation system subunit. The objective function of the LP is to minimize the equivalent annual fixed cost of pipe network of the irrigation system and its annual operating energy cost. The hydraulic characteristics in the irrigation subunit are ensured by using the length, energy conservation, and pressure head constraints. The input data are the system layout, segment-wise cost and hydraulic gradients in all the alternative pipe diameters, and energy cost per unit head of pumping water through the pipeline network. The output data are: segment-wise lengths of different diameters, operating inlet pressure head, and equivalent annual cost of the pipeline network. The explicit optimal design is demonstrated with design examples on lateral and submain or manifold of pressurized irrigation systems. The effect of the equations for friction head loss calculation on optimization procedure is investigated through the design example for microirrigation manifold. The performance evaluation of the proposed model in comparison with the analytical methods, graphical methods, numerical solutions, and dynamic programming optimization model reveals the good performance of the proposed model. The verification of operating inlet pressure head obtained by the proposed model with accurate numerical step-by-step method suggested that it is mostly accurate. 相似文献