本文關(guān)鍵詞： 安全閥 流量 實驗研究 數(shù)值模擬　出處：《華南理工大學(xué)》2011年碩士論文　論文類型：學(xué)位論文

【摘要】：安全閥在承壓設(shè)備,例如鍋爐壓力容器、壓力管道等系統(tǒng)中得到廣泛的應(yīng)用,它是一種用來防止壓力超過允許的極限值,確保生產(chǎn)系統(tǒng)正常運行的安全裝置。工業(yè)生產(chǎn)的各個行業(yè)中都廣泛應(yīng)用了安全閥,其正常動作對于帶壓設(shè)備的安全運行起著十分重要的作用。從安全閥的運行經(jīng)驗可知,安全閥在使用過程中會出現(xiàn)各種各樣的故障,如整定壓力隨著使用時間的推移會發(fā)生某些偏差,或者造成泄漏,閥瓣受粘,彈簧剛度過硬或軟化,閥桿不對中等,從而引起嚴重的后果。即使超壓時安全閥正常動作,如果排量不足以泄壓,也會對設(shè)備安全造成危害。所以對安全閥的流量測量非常重要。在安全閥的超壓泄放機理研究中,人們越來越認識到采用數(shù)值模擬進行研究的重要性,數(shù)值計算的結(jié)果能有效地以減少實驗研究的規(guī)模、次數(shù)并能夠更深入地探究安全閥介質(zhì)流動機理。 本文通過基本理論分析,嘗試建立一種通過閥芯傳感器的測試數(shù)據(jù)來計算安全閥開啟過程中泄放量(排量)的方法。 在對超壓泄放過程流場進行數(shù)值模擬,探討安全閥閥口流動的機理的基礎(chǔ)上,得到閥瓣膜在泄放過程中的閥口壓力隨泄放時間的變化過程,根據(jù)閥口流動類似于噴口流動過程的物理特征相似的特點,從而將泄放過程中壓力的時間變化曲線與有關(guān)瞬時流量關(guān)聯(lián),最終研究得到了一個有效的流量檢測方法。實驗室已經(jīng)研發(fā)出一種閥芯傳感器式的安全閥,并已經(jīng)實現(xiàn)采集安全閥開啟時閥芯應(yīng)變數(shù)據(jù)的功能,本文將這些數(shù)據(jù)轉(zhuǎn)化成壓力數(shù)據(jù)后繪制成曲線。本文研究如何利用這些曲線得到安全閥泄放流量的檢測方法。 在現(xiàn)場試驗研究中,本課題采用可壓縮介質(zhì)(空氣)來進行排放試驗,通過閥芯傳感器測試數(shù)據(jù)計算出排量,并與檢測法蘭計算流量的方法進行了初步的比較,結(jié)果證明了使用安全閥上裝設(shè)的閥芯傳感器的測試曲線進行流量測量的可行性和準確性。從而擴展了閥芯膜傳感器的應(yīng)用范圍。 通過數(shù)值模擬和實驗研究,發(fā)現(xiàn)帶有閥膜傳感器的安全閥可以在實現(xiàn)安全閥參數(shù)校驗性能參數(shù)的同時,檢測并計量安全閥的泄放流量,從而擴大了新型的閥芯膜傳感器的應(yīng)用范圍。
[Abstract]:Safety valves are widely used in pressure-bearing equipment such as boilers, pressure vessels, pressure pipes, and so on. They are used to prevent pressure from exceeding the allowable limit. Safety devices to ensure the normal operation of production systems. Safety valves are widely used in various industries of industrial production, and their normal operation plays a very important role in the safe operation of pressurized equipment. Various failures occur during the use of the relief valve, such as certain deviations in setting pressure over time, or leakage, adhesion to the disc, stiffness of the spring, or softening, and the stem is not moderate. This will cause serious consequences. Even if the relief valve works normally during overpressure, if the displacement is not sufficient to discharge the pressure, it will also cause harm to the safety of the equipment. Therefore, it is very important to measure the flow of the safety valve. In the study of the mechanism of overpressure discharge of the safety valve, More and more people realize the importance of numerical simulation. The results of numerical calculation can effectively reduce the scale and number of experimental studies and can further explore the mechanism of the flow of relief valve media. This paper attempts to establish a method to calculate the discharge (displacement) of the safety valve during the opening process by means of the test data of the spool sensor. Based on the numerical simulation of the flow field in the process of overpressure discharge and the discussion of the mechanism of the flow of the relief valve, the variation process of the valve opening pressure with the release time during the release process of the disc membrane is obtained. According to the similar physical characteristics of valve flow process similar to that of nozzle flow process, the time-varying curve of pressure during discharge is related to the relevant instantaneous flow rate. The laboratory has developed a kind of valve core sensor type safety valve, and has realized the function of collecting the valve core strain data when the valve opens. In this paper, these data are converted into pressure data and then plotted into curves. This paper studies how to use these curves to obtain the detection method of relief valve discharge flow. In the field test research, the subject uses compressible medium (air) to carry on the discharge test, calculates the displacement through the valve core sensor test data, and has carried on the preliminary comparison with the detection flange calculation flow method. The results show that it is feasible and accurate to use the test curve of the spool sensor installed on the safety valve to measure the flow, thus extending the scope of application of the spool film sensor. Through numerical simulation and experimental study, it is found that the safety valve with film sensor can detect and measure the discharge rate of the relief valve while verifying the performance parameters of the safety valve. Thus, the application range of the new type of spool film sensor is expanded.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH134

【引證文獻】

相關(guān)期刊論文 前2條

1 于鵬;王珍珠;;淺談鍋爐安全閥在線校驗[J];中小企業(yè)管理與科技(上旬刊);2012年12期

2 郭崇志;幸莎;;安全閥穩(wěn)態(tài)泄放過程的瞬態(tài)模擬與試驗驗證[J];液壓與氣動;2013年04期

相關(guān)碩士學(xué)位論文 前2條

1 朱壽林;安全閥排量及泄放機理仿真與實驗研究[D];華南理工大學(xué);2012年

2 幸莎;安全閥開啟流場參數(shù)的模擬與試驗研究[D];華南理工大學(xué);2013年

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本文編號：1499062