料仓皮带机电子秤在烧结生产工艺中的应用--一种模块式计量托辊电子皮带秤的应用实践

烧结生产,是钢铁工业的重要环节。烧结矿生产的各种矿料、燃料、辅料配比和烧结矿成品需要称重计量。烧结料配料与烧结矿成品基本是采用皮带机输送,烧结矿生产物料适宜采用电子皮带秤计量。为简化电子皮带秤的结构,降低安装和维护工作量,可将皮带机的上托辊,采用模块式计量托辊代替,可组合组装成多段计量的电子皮带秤。模块式计量托辊,可安装到原皮带机或原皮带电子秤,替代原托辊或原计量托辊。简化电子皮带秤的结构和安装,减少安装与维护工程量。嵌入式计量托辊模块,为发明专利产品。     

A benchmark data set for two-phase Coriolis metering

For more than a decade there has been growing interest in the use of Coriolis mass flow metering applied to two-phase (gas/liquid) and multiphase (oil/water/gas) conditions. It is well-established that the mass flow and density measurements generated from multiphase flows are subject to large errors, and a variety of physical models and correction techniques have been proposed to explain and/or to compensate for these errors. One difficulty is the absence of a common basis for comparing correction techniques, because different flowtube designs and configurations, as well as liquid and gas properties, may result in quite different error curves. Furthermore, some researchers with interests in the modelling aspects of the field may not have suitable multiphase laboratory facilities to generate their own data sets. This paper offers a small data set that may be used by researchers as a benchmark i.e. a common data set for comparing correction techniques. The data set was collected at the UK National Flow Laboratory TUV-NEL, using air and a viscous oil, and provides experimental points over a wide flow range (8:1 turndown) and with Gas Volume Fraction (GVF) values up to 60%. As a first investigation using the benchmark data set, we consider how data sparsity (i.e. the flow rate and GVF spacing in the experimental grid) affects the accuracy of a correction model. A range of neural network models are evaluated, based on different subsets of the benchmark data set. The data set and some exemplary code are provided with the paper. Additional data sets are available on a web site created to support this initiative.     

工业余热跨季节储热系统优化及经济性分析

以工业余热跨季节储热用于区域供热系统为研究对象,在一个已有的1 MW工业余热系统的基础上,搭建工业余热跨季节储热系统设计方案,通过系统模拟对系统储热、取热过程进行分析。分析结果表明:工业余热跨季节储热适合长周期、大规模蓄热;储热体体积和循环流量应根据系统热源和取热装置特性进行合理匹配,在合理匹配范围内可参考系统经济性确定系统最优配置。最后,通过费用年值法分析优化后的系统经济性,分析表明工业余热跨季节储热用于区域供热成本仅略高于燃煤供热,相比燃气供热具有非常可观的经济性。     

隐蔽老火区立体式综合治理研究

对2320隐蔽老火区首先通过灌注泥浆对火区进行治理,同时对部分裂隙通道进行堵漏,然后对泥浆不能到达的区域注入高倍数三相泡沫灭火材料泡沫,瞬间将火源处覆盖,火源因隔绝氧气而窒息灭火。三相泡沫具有良好的堆积性和流动性,对煤体具有保水保湿,惰化遗煤氧化空间,并能够对松散煤体进行化学阻化,从本质上降低遗煤自然氧化速率,消灭了隐蔽老火区的火灾隐患,具有较高的推广价值。     

煤炭企业能源计量工作的实践与探讨

该文主要阐述了淄博矿业集团的能源计量工作,通过采取健全完善组织机制、强化基础管理、重点突破技术创新、多手段综合应用等多种措施,取得了明显成效,有力地促进了企业的节能减排和降本提效。     

采区煤仓穿越交叉巷道延伸改造设计及工程实践

为解决采区煤仓容量小、运煤路线复杂等问题，提出了穿越煤仓上口交叉巷道向上延伸煤仓的方法，并通过理论分析和计算，确定了在不破坏原有煤仓的基础上利用“锚杆+锚索+喷射混凝土”和混凝土支护相结合的方式对煤仓进行永久支护的设计方案，并利用反井钻机快速施工缩小工期。城峰公司二采区采区煤仓使用该方法进行改造，结果表明此方法能在短时间内通过改造增加煤仓的容量，缩小运煤路线|SCCT软件的配筋计算能够获得钢筋混凝土穿过交叉巷道影响区域的合理参数|可为类似条件的井下煤仓改造施工提供借鉴。     

Numerical investigation of cavitating Herschel Venturi-Tubes applied to liquid flow metering

The objective of the present work is the numerical investigation of the applicability of hydrodynamic cavitating Herschel Venturi-Tubes to liquid flow metering. For this purpose, two- and three-dimensional simulations of cavitating flow in two different nozzle geometries were carried out using commercial CFD code. For several reasons, the Herschel Venturi-Tube proved to be superior to other types of nozzles such as the ISO 9300 with respect to liquid flow metering.     

DEM study of particle motion in novel high-speed seed metering device

This paper presents a numerical study on the motions of seed particles in a novel high-speed seed metering device based on the discrete element method. The effects of key parameters, including inlet velocity of particles, feeding rates and the angle of seed cleaning element, are investigated by a series of controlled numerical experiments. The results show that in the seed filling area of the device, a better match of particle velocity and the tangential linear velocity of the seeding plate can improve the seed filling performance. The number of particles remaining in the metering device is an important factor that affects the device performance. A large number of particles in the device results in more multiple seeding, and a small number causes more leakage seeding. Under the conditions of the seeding plate rotational speed at 194.5 rpm (corresponding to the high ground speed of 14 km/h), feeding rate at ~14 seeds/s can ensure that around 24 seed particles are maintained in the device which generates minimum leakage and multiple seeding. The studies of the effect of the seed cleaning element angle show that an appropriate angle (e.g., 30°) can effectively enhance the clearing ability, increase the uniform stability of particles backflow, and improve the seeding performance.     

两个大型住宅项目设计配套消防备供电源供电方案分析及优劣对比

通过对两个大型住宅项目配置消防备供电源供电方案进行对比,分析由此产生的建设安装造价成本高低,以及后期物业管理程序的难易程度,总结出适宜于大型住宅项目的消防备供电源供电方案,既能降低建设投资成本,又可以简化后期物业管理程序,更好地保障消防系统供电安全,值得推广。     

Prism Signal Processing of Coriolis meter data for gasoline fuel injection monitoring

Prism Signal Processing is a new recursive FIR technique offering rapid filter design and calculation. It has previously been applied to Coriolis mass flow metering to generate fast (48 kHz) flow measurement updates, facilitating for the first time the direct mass flow measurement of individual fuel pulses injected into a laboratory diesel fuel injection test bench. In this paper we describe an augmented sensor signal filtering scheme which enables rapid tracking of the desired mode of flow tube vibration while notching out undesired modes. The new scheme is applied to a gasoline injection test bench where the vibrational interference is greater than for the previously described diesel system due to increased hydraulic shock. The paper presents experimental findings which illustrate the further challenges to be overcome in order to achieve the goal of traceable direct mass flow measurement of individual fuel injection pulses. For example, when a fuel pulse is shorter than the resonant period of the flow tube, the observed phase difference appears to show dependence on the instantaneous phase of the flow tube vibration.