旋转式浓料分流阀的研制与应用

介绍一种适用于高浓度煤泥(体积含固量70±3%)等粘稠物料的管道旋转式浓料分流阀,详细阐述其分流原理、设计思想、结构特点、工作过程及其应用领域,为今后高浓度粘稠物料管道分流设备的应用提供依据。     

高浓度粘稠物料管道输送系统压力测试及其装置

高浓度粘稠物料存在于工业领域的各个行业,本文对高浓度粘稠物料的流变学特性和管道输送特性的研究出发,设计制造了适合此类非牛顿流体的管道输送压力测试装置.文中详细介绍了测压装置的结构组成、主要功能以及测试方法,并对该装置的静态标定和动态标定过程及其结果做了分析,通过对多种高浓度粘稠物料的实验测定,表明该测压装置安装位置合理、测试数据全面、测试精度和性能可靠、测压装置的结构紧凑、安装方便,完全适用于高浓度粘稠物料管道压力的测量.     

高浓度粘稠物料搅拌装置的研制与应用

针对高浓度粘稠物料内聚力较高,塑性和粘性较大,十分粘稠,搅拌均匀非常困难等问题,研发了专用的搅拌装置用于物料的存贮和搅拌成浆,实现了高浓度粘稠物料在仓内搅拌无死角、不堆积、不起拱、搅拌均匀且具有料位监测功能.本文详细介绍了该搅拌装置的主要结构、工作原理及主要特点.     

粘稠物料管道输送实验系统的设计与测试方法

本文以管道输送煤泥到电厂锅炉燃烧发电为背景,开展对粘稠物料的流变学特性和管道输送特性的研究。根据煤泥的流变特性,设计建造了适合此类高浓度、高粘稠度的非牛顿流体管道输送实验系统。实验结果表明,该系统设计合理、功能完善、测试数据准确可靠,可用于粘稠物料工业输送测试和指导现场的工业管道优化设计与安装调试。     

吸入特性测试装置的机械系统设计

为了研究大口径活塞泵对高浓度粘稠物料吸入容积效率,自行设计了吸入特性测试装置,简要阐述了机械系统的工作原理,详细介绍了物料缸、活塞、液动闸板阀等主要组成部分的功能与设计,最后简单介绍了测试装置的应用情况.     

高浓度粘稠物料加压旋转流变仪的研制与标定

高浓度粘稠物料(如原生煤泥、造纸污泥等一类工业副产品或固体废弃物)流变特性的测定在其管道输送系统的设计中有重要意义。这种粘稠物料若无添加剂作用在常压下是一种分散结团物料,不具备流体特性,无法采用一般旋转流变仪对其流变特性进行测试。因此研制出一种新型加压旋转流变仪(最高压力20MPa),将物料封闭加压,维持管道输送时的工况,保持其流体形态,从而达到物料加压流变特性测试的目的。该仪器的标定与使用结果表明其达到了设计要求,数据采集方便,测量自动化程度较高。     

基于吸入容积效率实测活塞泵排量的实验研究

为了能够准确测量活塞泵实际排量,根据往复式活塞泵排量计量原理,基于测量吸入容积效率的方法来计算活塞泵实际排量.首先针对影响吸入容积效率的主要因素,自行研制了一种高浓度黏稠物料吸入容积敛率测试装置,然后简要介绍了测试装置的组成及测试原理,建立了基于吸入容积效率计算实际排量的数学模型,再者开展高浓度煤泥实验,通过改变煤泥的质量分数、吸料速度、料缸长径比等工况来研究大口径活塞泵吸入容积效率,从而验证了该方法的可行性.通过该方法计算活塞泵实际排量,不仅更符合工程实际,而且能够研究何种工况下实际排量更接近于理论排量,为提高泉送效率及工程应用提供了技术依据.     

SLC30煤泥搓和机的改进设计

高浓度煤泥(质量浓度75%)在贮存中易于结块且在运输中常混入矸石、木块等杂质,故管道输送前必须对其破碎成浆,降低输送阻力.鉴于煤泥浓度高、持水性强、内聚力大,传统的破碎设备易发生堵塞,而SLC30煤泥搓和机弥补了传统破碎设备的缺陷,但实际应用中发现其煤泥处理量仅为20 t/h,无法满足工程需求.本文详述了SLC30煤泥搓和机的改进方案,最终使得煤泥的处理量增加至30 t/h,降底了煤泥破碎粒度,大大提高了其工作效率.     

气力输送系统中煤粉分流器的设计

在水泥、冶金和化工等行业的煅烧工艺过程中,一般都需要将燃烧均匀的物料等量地分供到多个燃烧喷嘴。而目前能较好地满足这一工艺要求的是在气力输送中应用在线分流技术。例如,国内新建的700～4000ｔ/ｄ熟料窑外分解干法水泥生产线中,煤磨系统制备的煤粉需分别输送到窑头喷煤管和窑尾分解炉燃烧器内,煤磨车间无论布置在窑头还是窑尾,都需要利用在线分流技术,由螺旋泵将煤粉均匀、等量、无脉冲地分送到多个燃烧喷嘴处。1　工作原理煤粉分流器的作用是将来自气力输送管道的煤粉均匀、等量、无脉冲地分送到各个分支管路中。当煤粉输送至分流器…     

预压螺旋的研究与应用

在泵送高浓度粘稠物料的浓料泵送系统中,由于所泵送的介质浓度高,粘度大,使得各种结构形式的浓料泵都有泵吸难的普遍问题,从而极大的限制了泵送效率.本文介绍了一种适用于高浓度粘稠物料泵送系统中给浓料泵提供带有一定压力和足够供给量的预压螺旋给料装置,详细阐述了其主要结构、工作原理及主要特点.     

高粘度煤泥加压旋转流变仪的标定与应用

高粘度煤泥流变特性是影响其高压管道输送阻力的一个重要因素．故研制加压旋转流变仪测量高粘度煤泥不同压力时的流变特性。标定加压旋转流变仪,用于测试压力对流变性的影响。使用加压旋转流变仪测试浓度75％煤泥的剪切应力和剪切速率．绘制了煤泥不同压力时的流变曲线和表观粘度曲线,通过分析确定了煤泥常压下是宾汉型流体,加压下为屈服假塑性流体。     

Concentration measurement with thermal probe for pulverized coal in the pneumatic pipeline of power plant

The concentration measurement of pulverized coal in a pneumatic pipeline is a challenging issue in power plant. A thermal probe manufactured with abrasion-proof steel was developed for coal concentration measurement in such a situation. The probe generates 15 W of heat. This method is based on the heat transfer between the thermal probe and the gas–solid two-phase flow. Experiments were conducted in a horizontal pneumatic pipeline to assess the accuracy of the thermal probe, where the gas was air and the solid was pulverized coal with mean diameter of 65 µm. The wall temperature of the thermal probe was found to be dependent on both coal powder concentration and air velocity. A new heat transfer correlation was proposed in terms of the modified Reynolds and Nusselt numbers for the gas–solid two-phase flow across the thermal probe. In the range of coal powder concentration from 0.1 to 0.65 kg/kg, the standard deviation is 0.01 kg/kg for the thermal probe. The thermal probe has potential application for concentration measurement of pulverized coal in the pneumatic pipelines of power plants.     

Numerical simulation on the erosion wear of a multiphase flow pipeline

The devices in coal chemical industries operate with harsh conditions, involving the high temperature, high pressure, and high concentration of pulverized coal particles. Therefore, leakages or perforations of pipelines occur frequently. In this paper, the numerical prediction on the erosion wear of a coal slurry transmission pipeline was conducted. The dense discrete phase model-kinetic theory of granular flow (DDPM-KTGF) and a modified erosion model were adopted to calculate the particle trajectories and erosion rates. In the numerical calculation, the erosion rate curve of 1Cr9Mo steel obtained in the experiments is incorporated into the erosion model. The results showed that the regions with high erosion risks predicted by the modified erosion model were in agreement with the experimental results. Then, the calculation method is validated. It is also found that the particle movements involve partial agglomeration under the drag of centrifugal force and the secondary flow, when they pass through the elbow. Larger particles are prone to impact on the back of the bend, which has more pronounced effect on the erosion wear. The positions of the maximum erosion rate on all the elbows were discussed, which provides a reference for the inspection on the wall thickness of pipeline.     

视频监控系统在长输管道及油气田高后果地区应用浅析

长输管道穿跨越、隧道、人员密集区等高后果区是油气管道运输过程中的高危区域,视频监控系统能够实现对该区域的实时监测和安全管控.针对监控网络搭建,提出高后果区视频监控系统建设解决方案,结合网络传输实现视频监控,终端用户能够通过平台联动处理各类报警,进行视频复核及应急预案处置,重点介绍了平台系统的组成结构、工作原理和技术特点...     

JYX高浓度黏稠物料加压旋转流变仪的研制

鉴于高浓度黏稠物料(如原生煤泥、城市污泥、造纸污泥等一类工业副产品或固体废弃物)若无添加剂作用在常压下是一种分散结团物质，流变参数测定过程中常出现被测介质“打滑”和容易“离析”等问题，研制出一种加压旋转流变仪(压力最高可达30MPa)，测量时将物料封闭加压，从而达到此类介质加压测量流变特性的目的。     

高铬耐磨铸铁复合管在选煤介质管路中的应用研究

从磨损类型和耐磨机理等方面，对高铬耐磨铸铁复合材料进行了探讨，试验结果和经济效益分析表明，这种高铬耐磨铸铁复合管对于选煤介质管路有良好的适用性和推广应用价值。     

Development of weighing tank system employing rotating double wing diverter

A new design for a diverter and weighing tank system has been developed. Experiments have been carried out on a prototype. Diverter wings are set as partitions along the diameter of a half-cylinder tube. The rotation axis is at the center of the half cylinder and runs parallel to liquid jets flowing vertically downward from several independent nozzles. This design contributes to small diverter timing error, compact design, small wet area, a simple and robust mechanism, easy implementation of the ISO4185 test, and easy adjustment of diverter trigger timing. After adjustment of start and stop signal timings, the estimated standard uncertainty caused by diverter timing error is reduced within a negligible small value (0.0019% or less) over a wide range of flow rates at any nozzle position. The weighing tank system has been improved by some refined devices. A single movement of the weighing platform can prevent escaping vapor, enable connection of an air tube, provide protection against impact, and provide a fail-safe against overflow. It is confirmed that the liquid flow calibration facility using the present system achieves accurate measurement, easy operation, wide flow range, high throughput, low cost, small weighing tank, easy maintenance, and safety.     

高清晰度漏磁检测器的研制及应用

石油天然气管道输送在国民经济中占有极为重要的战略地位,为确保输油气管道的安全运行,国内外正在积极推行管道完整性管理的理念。管道检测是完整性管理的重要组成部分,工业发达的国家均高度重视油气管道检测技术的研究和应用。本文简要介绍了漏磁检测技术的原理,以及高清晰度漏磁检测器的系统结构。