本文選題：安全閥　切入點：在線沖洗　出處：《河北工業(yè)大學》2011年碩士論文　論文類型：學位論文

【摘要】：安全閥用于煤直接液化工業(yè)的油煤漿輸送管路時,當安全閥泄壓后,密封面上往往殘存煤顆粒,使閥瓣和閥座間存在縫隙,造成閥門關不死,從而產(chǎn)生內(nèi)泄漏,同時顆粒的存在會加劇閥瓣和閥座密封面的磨損,影響安全閥的密封性能。有效地清除密封面上的固相顆粒,是解決此問題的關鍵。為此本課題提出了一種含固體顆粒流體用安全閥的自動沖洗裝置,并應用FLUENT軟件的歐拉模型對沖洗過程進行了三維數(shù)值模擬,初步探討了方案的可行性。 通過對不含油源設備的在線沖洗裝置沖洗過程進行模擬研究發(fā)現(xiàn),對沖洗油管路與閥門連接管路的連接三通的角度進行合理地選擇,設定了合理的沖洗油管路入口的壓力,對閥門沖洗過程進行模擬計算發(fā)現(xiàn),沖洗一定的時間后,密封面上的煤粉顆粒體積率低于10-6,可認為密封面已被沖洗干凈。同時,分析了液固兩相流在沖洗裝置中的流動特點,討論了由沖洗過程對油煤漿輸送系統(tǒng)造成影響。 對以氣液式蓄勢器為油源設備的沖洗結構進行了研究。在不同壓力下,對連接蓄勢器和安全閥入口管路的三通采用不同角度,分別對不同裝置的沖洗過程進行數(shù)值模擬,分析了三通角度和蓄勢器壓力對沖洗過程的影響。沖洗一定時間后,閥瓣與閥座間顆粒相體積率低于10-6,且總耗油量在蓄勢器出油容量之內(nèi),可認為上述裝置能夠完成對閥門密封面的沖洗。 比較發(fā)現(xiàn),相同壓力下,60°斜三通裝置對煤漿系統(tǒng)的影響最小,45°斜三通裝置次之;不同壓力下,45°斜三通裝置可完成沖洗的壓力較低,總耗油量及進入油煤漿體系的油量小,優(yōu)于60°斜三通裝置。
[Abstract]:When the safety valve is used in the pipeline of coal slurry transportation in the direct coal liquefaction industry, when the pressure of the relief valve is released, the coal particles are often left on the sealing surface, resulting in a gap between the valve disc and the valve seat, resulting in the valve not being closed and resulting in internal leakage. At the same time, the presence of particles will increase the disc and seat sealing surface wear, affecting the sealing performance of the relief valve, effectively remove the solid particles on the sealing surface, This paper presents an automatic flushing device for the safety valve with solid particle fluid, and uses Euler model of FLUENT software to simulate the flushing process. The feasibility of the scheme is discussed preliminarily. Through the simulation study on the flushing process of the on-line flushing device without oil source equipment, it is found that the angle of connection between the flushing tubing line and the valve connecting pipeline is reasonably selected, and the reasonable pressure of the inlet of the flushing tubing line is set up. The simulation calculation of the valve flushing process shows that the volume ratio of pulverized coal particles on the sealing surface is less than 10-6 after washing for a certain time, and the sealing surface has been flushed out. At the same time, the flow characteristics of liquid-solid two-phase flow in the flushing device are analyzed. The influence of washing process on coal slurry conveying system is discussed. The flushing structure of gas-liquid accumulator as oil source equipment was studied. Under different pressures, the flushing process of different devices was simulated from different angles to connect the accumulator and the inlet pipe of safety valve. The effect of the angle of three links and the pressure of accumulator on the flushing process is analyzed. After flushing for a certain time, the volume ratio of particle phase between disc and seat is lower than 10-6, and the total oil consumption is within the oil output capacity of the accumulator. It can be considered that the above device can complete the flushing of the valve sealing surface. It is found that the influence of 60 擄oblique three-way unit on coal slurry system is the smallest at the same pressure, and that 45 擄oblique three-way unit under different pressures has lower pressure to complete washing, less total oil consumption and less oil into coal slurry system. It is better than 60 擄oblique three-way device.
【學位授予單位】：河北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2011
【分類號】：TH134

【引證文獻】

相關碩士學位論文 前1條

1 陳曉敏;粉—粉噴動床半干法煙氣脫硫反應的數(shù)值模擬[D];西北大學;2012年

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本文編號：1557724