枝狀火炬管網(wǎng)壓降計算的建模與仿真
發(fā)布時間：2018-12-17 00:55
【摘要】：火炬管網(wǎng)用于收集石化工藝裝置在開、停車及事故工況下排放的多余物料,在石化工業(yè)的安全生產(chǎn)中扮演重要角色。在工藝裝置的改造或擴建過程中,火炬管網(wǎng)的泄放點個數(shù)和泄放量發(fā)生改變,可能會導(dǎo)致安全泄放裝置的出口壓力超過其最大允許背壓,火炬氣無法排入管網(wǎng)。針對上述問題,以枝狀結(jié)構(gòu)的火炬管網(wǎng)為研究對象,開展火炬管網(wǎng)壓降計算的研究。本文的主要工作及成果如下:(1)根據(jù)火炬系統(tǒng)的設(shè)計標準的要求,在安全泄放裝置的背壓限制條件和管道內(nèi)氣體流速限制條件下,分別采用Romeo方程和Drwnchuk-Purvis-Robinson方程,對API 521標準中氣體排放管道壓降計算公式的摩擦阻力系數(shù)和氣體壓縮因子計算方法進行改進。將改進公式應(yīng)用于火炬管道的壓降計算,通過與其它管道壓降計算公式的案例分析對比,結(jié)果表明在一定管長范圍內(nèi),各計算結(jié)果幾乎完全吻合。這證明在保證計算效率的前提下,所提出的火炬管道壓降計算方法合理可用。(2)在對枝狀火炬管網(wǎng)進行抽象描述的前提下,利用關(guān)聯(lián)矩陣建立了管網(wǎng)拓撲模型;將其與上述火炬管道壓降公式聯(lián)合,最終實現(xiàn)了對火炬管網(wǎng)壓降的求解。通過與其它管網(wǎng)軟件進行案例分析對比,結(jié)果表明計算誤差在5%以內(nèi)。(3)為提高計算的精度和穩(wěn)定性,采用Crank-Nicolson隱式差分格式構(gòu)造氣體管道瞬態(tài)模型的差分方程,建立了適用于火炬管道入口壓力動態(tài)分析的瞬態(tài)流動模型。通過與管網(wǎng)瞬態(tài)模擬軟件Pipeline Studio(PLS)進行案例分析對比,結(jié)果表明在管道壓力較大或者管道長度較短的條件下,兩者計算結(jié)果吻合度較高,因此證明所建管道瞬態(tài)模型在一定范圍內(nèi)合理可用。(4)在火炬管道瞬態(tài)流動模型的基礎(chǔ)上,添加管網(wǎng)內(nèi)部節(jié)點處的流量及壓力邊界條件,建立了火炬管網(wǎng)瞬態(tài)流動模型。通過與PLS軟件進行案例分析對比,發(fā)現(xiàn)該模型的計算結(jié)果與PLS仿真結(jié)果有一定的偏差,但兩者計算結(jié)果的總體變化趨勢基本一致且相對誤差基本保持在可接受范圍以內(nèi)。
[Abstract]:The torch pipe network is used to collect the excess materials discharged by petrochemical process equipment under open, stop and accident conditions, which plays an important role in the safety production of petrochemical industry. In the process of revamping or extending the process equipment, the number and quantity of the discharge points of the torch pipe network will change, which may lead to the outlet pressure of the safe discharge device exceeding its maximum allowable back pressure, and the flare gas can not be discharged into the pipe network. Aiming at the above problems, the study on the calculation of the pressure drop of the torch pipe network is carried out with the branch structure of the torch pipe network as the research object. The main work and results are as follows: (1) according to the requirements of the design standard of the torch system, the Romeo equation and the Drwnchuk-Purvis-Robinson equation are adopted under the condition of the back pressure limitation of the safe discharge device and the gas velocity limit in the pipeline, respectively. The calculation method of friction resistance coefficient and gas compression factor of pressure drop formula of gas discharge pipe in API 521 standard is improved. The improved formula is applied to the calculation of the pressure drop of the torch pipeline. The results show that the calculated results are almost consistent with each other in a certain range of pipe length through the analysis and comparison with the other calculation formulas of the pressure drop of the torch pipeline. This proves that the proposed calculation method of flare pipeline pressure drop can be reasonably used on the premise of ensuring the calculation efficiency. (2) based on the abstract description of the branch torch pipe network, the topological model of the pipe network is established by using the correlation matrix; Combined with the above formula, the solution of the pressure drop of the torch pipe network is realized. The results show that the calculation error is less than 5%. (3) in order to improve the accuracy and stability of the calculation, the Crank-Nicolson implicit difference scheme is used to construct the difference equation of the gas pipeline transient model. A transient flow model suitable for the dynamic analysis of inlet pressure of torch pipeline is established. Through the case analysis and comparison with the transient simulation software Pipeline Studio (PLS) of pipe network, the results show that under the condition of high pressure or short length of pipeline, the calculated results are in good agreement with each other. Therefore, it is proved that the established transient model can be reasonably used in a certain range. (4) on the basis of the transient flow model of the torch pipeline, the transient flow model of the torch pipeline network is established by adding the flow and pressure boundary conditions at the internal nodes of the pipe network. By comparing with the PLS software, it is found that the calculation results of the model are different from those of the PLS simulation results, but the overall variation trend of the two results is basically the same and the relative error is kept within the acceptable range.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ052.7
本文編號：2383350
[Abstract]:The torch pipe network is used to collect the excess materials discharged by petrochemical process equipment under open, stop and accident conditions, which plays an important role in the safety production of petrochemical industry. In the process of revamping or extending the process equipment, the number and quantity of the discharge points of the torch pipe network will change, which may lead to the outlet pressure of the safe discharge device exceeding its maximum allowable back pressure, and the flare gas can not be discharged into the pipe network. Aiming at the above problems, the study on the calculation of the pressure drop of the torch pipe network is carried out with the branch structure of the torch pipe network as the research object. The main work and results are as follows: (1) according to the requirements of the design standard of the torch system, the Romeo equation and the Drwnchuk-Purvis-Robinson equation are adopted under the condition of the back pressure limitation of the safe discharge device and the gas velocity limit in the pipeline, respectively. The calculation method of friction resistance coefficient and gas compression factor of pressure drop formula of gas discharge pipe in API 521 standard is improved. The improved formula is applied to the calculation of the pressure drop of the torch pipeline. The results show that the calculated results are almost consistent with each other in a certain range of pipe length through the analysis and comparison with the other calculation formulas of the pressure drop of the torch pipeline. This proves that the proposed calculation method of flare pipeline pressure drop can be reasonably used on the premise of ensuring the calculation efficiency. (2) based on the abstract description of the branch torch pipe network, the topological model of the pipe network is established by using the correlation matrix; Combined with the above formula, the solution of the pressure drop of the torch pipe network is realized. The results show that the calculation error is less than 5%. (3) in order to improve the accuracy and stability of the calculation, the Crank-Nicolson implicit difference scheme is used to construct the difference equation of the gas pipeline transient model. A transient flow model suitable for the dynamic analysis of inlet pressure of torch pipeline is established. Through the case analysis and comparison with the transient simulation software Pipeline Studio (PLS) of pipe network, the results show that under the condition of high pressure or short length of pipeline, the calculated results are in good agreement with each other. Therefore, it is proved that the established transient model can be reasonably used in a certain range. (4) on the basis of the transient flow model of the torch pipeline, the transient flow model of the torch pipeline network is established by adding the flow and pressure boundary conditions at the internal nodes of the pipe network. By comparing with the PLS software, it is found that the calculation results of the model are different from those of the PLS simulation results, but the overall variation trend of the two results is basically the same and the relative error is kept within the acceptable range.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ052.7
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