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  本文選題：安全閥　切入點(diǎn)：在線沖洗　出處：《河北工業(yè)大學(xué)》2011年碩士論文　論文類(lèi)型：學(xué)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(shí),當(dāng)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(mén)關(guān)不死,從而產(chǎn)生內(nèi)泄漏,同時(shí)顆粒的存在會(huì)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(wèn)題的關(guān)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(dòng)沖洗裝置,并應(yīng)用FLUENT軟件的歐拉模型對(duì)沖洗過(guò)程進(jìn)行了三維數(shù)值模擬,初步探討了方案的可行性。 通過(guò)對(duì)不含油源設(shè)備的在線沖洗裝置沖洗過(guò)程進(jìn)行模擬研究發(fā)現(xiàn),對(duì)沖洗油管路與閥門(mén)連接管路的連接三通的角度進(jìn)行合理地選擇,設(shè)定了合理的沖洗油管路入口的壓力,對(duì)閥門(mén)沖洗過(guò)程進(jìn)行模擬計(jì)算發(fā)現(xiàn),沖洗一定的時(shí)間后,密封面上的煤粉顆粒體積率低于10-6,可認(rèn)為密封面已被沖洗干凈。同時(shí),分析了液固兩相流在沖洗裝置中的流動(dòng)特點(diǎn),討論了由沖洗過(guò)程對(duì)油煤漿輸送系統(tǒng)造成影響。 對(duì)以氣液式蓄勢(shì)器為油源設(shè)備的沖洗結(jié)構(gòu)進(jìn)行了研究。在不同壓力下,對(duì)連接蓄勢(shì)器和安全閥入口管路的三通采用不同角度,分別對(duì)不同裝置的沖洗過(guò)程進(jìn)行數(shù)值模擬,分析了三通角度和蓄勢(shì)器壓力對(duì)沖洗過(guò)程的影響。沖洗一定時(shí)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(shì)器出油容量之內(nèi),可認(rèn)為上述裝置能夠完成對(duì)閥門(mén)密封面的沖洗。 比較發(fā)現(xiàn),相同壓力下,60°斜三通裝置對(duì)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(jìn)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(xué)位授予單位】：河北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH134

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

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

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本文編號(hào)：1557724