【摘要】：本文根據(jù)組合式三相分離器中氣液分離的要求開(kāi)發(fā)出一種裝有單根濾芯的聚結(jié)過(guò)濾裝置。試驗(yàn)中采用不同結(jié)構(gòu)參數(shù)的濾芯進(jìn)行了有關(guān)阻力特性、分離效率、進(jìn)出口液滴粒徑測(cè)量等研究。結(jié)合Fluent軟件研究了基準(zhǔn)結(jié)構(gòu)內(nèi)部的氣液兩相流場(chǎng),得到了氣相的流動(dòng)狀態(tài)、液滴的分布及逃逸規(guī)律,并進(jìn)行了結(jié)構(gòu)優(yōu)化。結(jié)果表明:操作參數(shù)和結(jié)構(gòu)參數(shù)均會(huì)對(duì)天然氣聚結(jié)過(guò)濾器的阻力特性及氣液分離效率產(chǎn)生影響。同一流量下減小濾芯的過(guò)濾面積,裝置進(jìn)出口壓差會(huì)增加。當(dāng)入口流量較低時(shí),氣液分離效率隨流量的增大而提高,但當(dāng)流量超過(guò)臨界流量后,分離效率會(huì)迅速下降。氣液分離效率與入口液滴粒徑的尺度有密切的關(guān)系,試驗(yàn)裝置對(duì)中位粒徑為8.7μm的液滴群的捕集效率顯著低于中位粒徑為40μm的液滴群。當(dāng)入口液滴濃度在30~75g/m3范圍內(nèi)變化時(shí),氣液分離效率隨加入液滴濃度的增加而提高,主要原因是液滴濃度越高,液滴聚并的幾率也越大,大粒徑的液滴更易于捕集。當(dāng)濾芯的過(guò)濾精度由10μm提高到2μm時(shí),氣液分離效率隨之提高,但阻力損失會(huì)隨之增加。過(guò)濾面積較小的濾芯更適合在低氣體流量下進(jìn)行分離操作。試驗(yàn)中通過(guò)激光粒度儀對(duì)分離器進(jìn)出口處液滴粒徑進(jìn)行在線測(cè)量,發(fā)現(xiàn)粒徑大于8μm的液滴基本除盡。通過(guò)試驗(yàn)得出了濾芯過(guò)濾精度與極限分離粒徑之間的對(duì)應(yīng)關(guān)系。通過(guò)Fluent軟件對(duì)內(nèi)部流動(dòng)規(guī)律進(jìn)行模擬,發(fā)現(xiàn)通過(guò)濾芯的氣量具有軸向的不均勻性,67.7%的氣流通過(guò)濾芯的上部區(qū)域進(jìn)入排氣管。優(yōu)化了入口結(jié)構(gòu),新結(jié)構(gòu)可以改善濾芯軸向氣量的分布但不顯著增加能耗。
[Abstract]:According to the requirement of gas-liquid separation in combined three-phase separator, a kind of coalescence filter device with single filter element is developed in this paper. The characteristics of resistance, separation efficiency and particle size measurement of liquid droplets were studied by using filter elements with different structure parameters. Combined with Fluent software, the gas-liquid two-phase flow field in the reference structure is studied, and the gas phase flow state, droplet distribution and escape law are obtained, and the structure optimization is carried out. The results show that both the operating parameters and the structure parameters have an effect on the resistance characteristics and the gas-liquid separation efficiency of the natural gas coalescence filter. At the same flow rate, the pressure difference between the inlet and outlet of the device will increase. When the inlet flow rate is low, the gas-liquid separation efficiency increases with the increase of the flow rate, but when the flow rate exceeds the critical flow rate, the separation efficiency will decrease rapidly. The efficiency of gas-liquid separation is closely related to the size of the inlet droplet size. The trapping efficiency of the experimental device for the droplet group with a median diameter of 8.7 渭 m is significantly lower than that of the liquid droplet group with a median diameter of 40 渭 m. When the concentration of the inlet droplet changes in the range of 30~75g/m3, the efficiency of gas-liquid separation increases with the increase of the concentration of the added droplet, the main reason is that the higher the concentration of the droplet, the greater the probability of droplet aggregation, and the larger the size of the droplet is, the easier it is to trap the droplet. When the filter precision is increased from 10 渭 m to 2 渭 m, the gas-liquid separation efficiency increases, but the resistance loss increases. The filter with small filter area is more suitable for separation operation at low gas flow rate. In the experiment, the particle size of the liquid droplets at the inlet and outlet of the separator was measured by laser particle size analyzer, and it was found that the droplets with diameter larger than 8 渭 m were basically eliminated. The relationship between the filter precision and the particle size of the limit separation is obtained by experiments. The internal flow pattern was simulated by Fluent software and it was found that 67.7% of the air flow through the upper part of the filter entered the exhaust pipe. By optimizing the inlet structure, the new structure can improve the axial flow distribution of the filter core, but not increase the energy consumption significantly.
【學(xué)位授予單位】：中國(guó)石油大學(xué)(華東)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TE953

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