本文選題：散料系統(tǒng) + 氣固兩相流��； 參考：《江蘇科技大學(xué)》2017年碩士論文

【摘要】：散料系統(tǒng)是一種采用氣力輸送方式,通過密閉管路完成散料輸送的海工配套系統(tǒng),在海洋石油三用工作船、平臺(tái)供應(yīng)船、海上鉆井平臺(tái)、散裝水泥船、陸基散料灰站等方面有著廣泛的應(yīng)用。近年來海工市場的不斷擴(kuò)大,國內(nèi)散料系統(tǒng)得到了快速的發(fā)展,但相較于國外散料系統(tǒng),我國的散料系統(tǒng)研究相對(duì)落后,存在著設(shè)備采購成本高、散料罐體型大等問題,導(dǎo)致了國內(nèi)散料系統(tǒng)售價(jià)高、船舶建造難度大。針對(duì)當(dāng)前我國散料系統(tǒng)發(fā)展存在的問題,本文開展了吸壓組合式散料系統(tǒng)的方案設(shè)計(jì)研究,為國內(nèi)散料系統(tǒng)供應(yīng)商降本增效,提高企業(yè)競爭力奠定了基礎(chǔ)。本文的具體研究內(nèi)容如下:首先,本文基于正壓式散料系統(tǒng),通過以常壓艙室替代散料罐,以增設(shè)復(fù)載罐和真空泵實(shí)現(xiàn)正負(fù)壓組合循環(huán)式輸送散料為手段,進(jìn)行了吸壓組合式散料系統(tǒng)方案設(shè)計(jì)。散料系統(tǒng)方案設(shè)計(jì)包括散料系統(tǒng)的系統(tǒng)構(gòu)成、工作原理和流程、自動(dòng)控制系統(tǒng)與界面設(shè)計(jì)以及散料系統(tǒng)設(shè)計(jì)中需注意的特殊要求等。其次,本文以G級(jí)油井水泥顆粒為輸送介質(zhì),運(yùn)用solidworks、hypermesh和fluent軟件開展復(fù)載罐進(jìn)灰工況和出灰工況、緩沖罐輸送效率的數(shù)值模擬,以驗(yàn)證吸壓組合式散料系統(tǒng)的可行性以及其輸送能力能否滿足工程需要。復(fù)載罐進(jìn)灰工況的數(shù)值模擬中,分析罐內(nèi)水泥顆粒的運(yùn)動(dòng)特性和負(fù)壓吸送口的質(zhì)量流量,確定復(fù)載罐的進(jìn)灰時(shí)間和進(jìn)灰效率,并通過優(yōu)化復(fù)載罐結(jié)構(gòu)延長進(jìn)灰時(shí)間,提高進(jìn)灰效率;復(fù)載罐出灰工況的數(shù)值模擬中,參考鉆井平臺(tái)的輸灰管路布置、長度以及風(fēng)量,通過數(shù)值模擬對(duì)復(fù)載罐的進(jìn)灰和出灰進(jìn)行時(shí)間配比,滿足兩個(gè)復(fù)載罐循環(huán)式輸灰的節(jié)拍,并在考慮降低能耗的前提下,確定符合復(fù)載罐進(jìn)灰和出灰節(jié)拍的輸灰風(fēng)量;緩沖罐輸送效率的數(shù)值模擬中,在同一氣流速度和固氣比的前提下,研究不同粒徑下的緩沖罐輸送效率,并在節(jié)省能耗的前提下,確定輸送效率相比較高的油井水泥顆粒粒徑。最后,通過在進(jìn)灰口和緩沖罐卸料口的平均質(zhì)量流量計(jì)算得到吸壓組合式散料系統(tǒng)的輸送效率和輸送能力。
[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.
【學(xué)位授予單位】：江蘇科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P75

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本文編號(hào)：2017392