海洋工程中吸压组合式散料系统的方案设计研究

发布时间：2018-06-14 12:32

本文选题：散料系统 + 气固两相流　；参考：《江苏科技大学》2017年硕士论文

【摘要】：散料系统是一种采用气力输送方式,通过密闭管路完成散料输送的海工配套系统,在海洋石油三用工作船、平台供应船、海上钻井平台、散装水泥船、陆基散料灰站等方面有着广泛的应用。近年来海工市场的不断扩大,国内散料系统得到了快速的发展,但相较于国外散料系统,我国的散料系统研究相对落后,存在着设备采购成本高、散料罐体型大等问题,导致了国内散料系统售价高、船舶建造难度大。针对当前我国散料系统发展存在的问题,本文开展了吸压组合式散料系统的方案设计研究,为国内散料系统供应商降本增效,提高企业竞争力奠定了基础。本文的具体研究内容如下:首先,本文基于正压式散料系统,通过以常压舱室替代散料罐,以增设复载罐和真空泵实现正负压组合循环式输送散料为手段,进行了吸压组合式散料系统方案设计。散料系统方案设计包括散料系统的系统构成、工作原理和流程、自动控制系统与界面设计以及散料系统设计中需注意的特殊要求等。其次,本文以G级油井水泥颗粒为输送介质,运用solidworks、hypermesh和fluent软件开展复载罐进灰工况和出灰工况、缓冲罐输送效率的数值模拟,以验证吸压组合式散料系统的可行性以及其输送能力能否满足工程需要。复载罐进灰工况的数值模拟中,分析罐内水泥颗粒的运动特性和负压吸送口的质量流量,确定复载罐的进灰时间和进灰效率,并通过优化复载罐结构延长进灰时间,提高进灰效率;复载罐出灰工况的数值模拟中,参考钻井平台的输灰管路布置、长度以及风量,通过数值模拟对复载罐的进灰和出灰进行时间配比,满足两个复载罐循环式输灰的节拍,并在考虑降低能耗的前提下,确定符合复载罐进灰和出灰节拍的输灰风量;缓冲罐输送效率的数值模拟中,在同一气流速度和固气比的前提下,研究不同粒径下的缓冲罐输送效率,并在节省能耗的前提下,确定输送效率相比较高的油井水泥颗粒粒径。最后,通过在进灰口和缓冲罐卸料口的平均质量流量计算得到吸压组合式散料系统的输送效率和输送能力。
[Abstract]:Bulk material system is a kind of marine engineering supporting system which adopts pneumatic conveying mode and completes bulk material transportation through closed pipeline. It is used in offshore oil three-purpose working ship, platform supply ship, offshore drilling platform, bulk cement ship. The ground-based bulk ash station has been widely used in many fields. In recent years, with the continuous expansion of the marine engineering market, the domestic bulk material system has been rapidly developed. However, compared with the foreign bulk material system, the study of the bulk material system in China is relatively backward, and there are many problems such as the high cost of equipment procurement and the large bulk. As a result of the domestic bulk material system high price, ship construction is very difficult. In view of the problems existing in the development of bulk material system in China, the project design of the combined bulk material system with suction pressure is carried out in this paper, which lays a foundation for reducing the cost and increasing the efficiency of the domestic bulk material system suppliers and improving the competitiveness of enterprises. The specific research contents of this paper are as follows: firstly, based on the barotropic bulk material system, this paper uses the atmospheric chamber instead of the bulk tank to realize the positive and negative pressure combined circulation bulk conveying by adding the reloaded tank and vacuum pump. The scheme design of the combined bulk material system of suction and pressure is carried out. The scheme design of bulk material system includes the system structure, working principle and flow chart, automatic control system and interface design, and special requirements in bulk system design. Secondly, using G grade oil well cement particles as transport medium, using solidworkshypermesh and fluent software to carry out the numerical simulation of the conveying efficiency of reloaded tank under the condition of ash inlet and outlet, and the transport efficiency of buffer tank. In order to verify the feasibility of the combined bulk material suction system and its transport capacity to meet the needs of the project. In the numerical simulation of reloading tank, the movement characteristics of cement particles and the mass flow rate of negative pressure suction port are analyzed, and the time and efficiency of reloading tank are determined, and the ash feeding time is extended by optimizing the structure of reload tank. In the numerical simulation of reload tank's ash discharge condition, referring to the arrangement, length and air volume of the ash conveying pipeline of drilling platform, the time ratio of ash inlet and outlet of the reloaded tank is simulated by numerical simulation. In order to satisfy the rhythm of circulating ash transportation of two reloaded tanks, and considering the reduction of energy consumption, the air volume of ash transport in accordance with the timing of ash intake and ash discharge of the reloaded tank is determined, and in the numerical simulation of the transport efficiency of buffer tank, Under the premise of the same gas velocity and solid gas ratio, the transport efficiency of buffer tank with different particle sizes is studied, and the particle size of oil well cement particles with higher transport efficiency is determined on the premise of saving energy consumption. Finally, through the calculation of the average mass flow rate at the intake port and the discharging port of the buffer tank, the transport efficiency and the transport capacity of the combined suction and pressure bulk system are obtained.
【学位授予单位】：江苏科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P75

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