疏松混合物材料微波特性分析與應用
發(fā)布時間：2018-11-10 08:52
【摘要】：疏松混合物,本文是指將兩種或多種物質組成的散�；蚍蹱钗镒杂傻靥畛涞侥骋还潭ㄈ萜髦械亩逊e狀態(tài)。應“貧油料微波高功率處理”課題需求,對油砂樣品在加熱容器中的微波特性進行測量分析,設計出一種提高微波加熱效率的手段。本文選擇較成熟的TM0n0模式圓柱諧振腔進行物料的復介電常數(shù)測量,利用Lichtenecker對數(shù)混合物公式計算油砂樣品在加熱爐內(nèi)自由堆積狀態(tài)下的等效復介電常數(shù),并設計了一套能滿足工業(yè)化需求的加熱爐原型機,在常溫下做了端口反射的簡單測量,與理論比較一致性良好。具體研究成果如下:(1)本文首先針對貧油料在熱解過程中的物理特性進行分析,總結出“疏松混合物”的特點,在針對混合物的一系列等效理論中,選擇一種有效介質理論作為分析重點;Lichtenecker對數(shù)混合物公式得到過理論證明,從而脫離于半經(jīng)驗公式的范疇,利用該公式進行推導,得到混合物料和空氣均勻混合下的等效復介電常數(shù)表達式;其次,利用CM因子推導了對數(shù)公式和其他兩種常見公式之間的關系,表明對數(shù)公式在實際應用中具有明顯優(yōu)勢。(2)隨后,根據(jù)疏松混合物材料介電特性,提出了利用諧振腔微擾法測量其復介電常數(shù),并制作了TM0n0模式圓柱諧振腔測試系統(tǒng),搭建了簡易的可用于加熱的實驗平臺;然后用石英、聚四氟乙烯和水對測試算法進行校準,在常溫下,對兩組各10份不同含水率含油率的油砂樣品進行測試,分析了測試結果并發(fā)現(xiàn):含油率的高低對測試結果影響不明顯,而含水率是影響微波損耗的關鍵因素。(3)最后,圍繞微波加熱技術優(yōu)勢展開敘述,應產(chǎn)業(yè)化需求,針對915MHz工業(yè)微波源,提出利用開放式同軸諧振腔系統(tǒng)作為加熱容器的方案,仿真并實際加工了一套同軸腔原型機,常溫下分別填充體積分數(shù)為0.4、0.5、0.6、0.7的油砂樣品,測得端口電壓駐波比,與理論值比較發(fā)現(xiàn):同軸諧振腔實測端口反射大于理論值,但變化趨勢保持一致,驗證了對數(shù)公式理論具有一定適用性,最后分析了系統(tǒng)存在的誤差項。
[Abstract]:Loose mixture, in this paper, refers to the stacking state in which two or more particles or powders are freely filled in a fixed container. In order to meet the requirement of "microwave high power treatment of lean oil materials", the microwave characteristics of oil sand sample in heating vessel were measured and analyzed, and a method to improve the efficiency of microwave heating was designed. In this paper, the complex dielectric constant of the material is measured with the more mature TM0n0 mode cylindrical resonator, and the equivalent complex dielectric constant of the oil sand sample is calculated by using the Lichtenecker logarithmic mixture formula under the condition of free stacking in the heating furnace. A reheating furnace prototype is designed to meet the needs of industrialization. A simple measurement of port reflection is made at room temperature, which is in good agreement with the theory. The specific research results are as follows: (1) in this paper, the physical properties of lean oil during pyrolysis are analyzed, and the characteristics of "loose mixture" are summarized. A kind of effective medium theory is chosen as the key point of the analysis. The Lichtenecker logarithmic mixture formula has been proved by theory, which is derived from the semi-empirical formula, and the equivalent complex permittivity expression under uniform mixing of mixture material and air is obtained. Secondly, the relationship between logarithmic formula and other common formulas is deduced by using CM factor, which shows that logarithmic formula has obvious advantages in practical application. (2) subsequently, according to the dielectric properties of loose mixture materials, The complex permittivity is measured by the resonator perturbation method, and the TM0n0 mode cylindrical resonator testing system is made, and a simple experimental platform for heating is set up. Then the algorithm was calibrated with quartz, polytetrafluoroethylene and water. Two groups of 10 oil sand samples with different water content were tested at room temperature. The test results are analyzed and it is found that the oil content has no obvious influence on the test results, but the water content is the key factor affecting microwave loss. (3) finally, the advantages of microwave heating technology are described, which should be industrialized. Aiming at 915MHz industrial microwave source, a scheme of using open coaxial resonator system as heating vessel is put forward. A coaxial cavity prototype machine is simulated and processed. The oil sand sample with volume fraction of 0.4g 0.5U 0.60.70 is filled separately at room temperature. The port voltage standing wave ratio is measured and compared with the theoretical value. It is found that the measured port reflection of the coaxial resonator is larger than the theoretical value, but the variation trend is consistent, which verifies the applicability of the logarithmic formula theory. Finally, the error term of the system is analyzed.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB30;TE31
本文編號：2321971
[Abstract]:Loose mixture, in this paper, refers to the stacking state in which two or more particles or powders are freely filled in a fixed container. In order to meet the requirement of "microwave high power treatment of lean oil materials", the microwave characteristics of oil sand sample in heating vessel were measured and analyzed, and a method to improve the efficiency of microwave heating was designed. In this paper, the complex dielectric constant of the material is measured with the more mature TM0n0 mode cylindrical resonator, and the equivalent complex dielectric constant of the oil sand sample is calculated by using the Lichtenecker logarithmic mixture formula under the condition of free stacking in the heating furnace. A reheating furnace prototype is designed to meet the needs of industrialization. A simple measurement of port reflection is made at room temperature, which is in good agreement with the theory. The specific research results are as follows: (1) in this paper, the physical properties of lean oil during pyrolysis are analyzed, and the characteristics of "loose mixture" are summarized. A kind of effective medium theory is chosen as the key point of the analysis. The Lichtenecker logarithmic mixture formula has been proved by theory, which is derived from the semi-empirical formula, and the equivalent complex permittivity expression under uniform mixing of mixture material and air is obtained. Secondly, the relationship between logarithmic formula and other common formulas is deduced by using CM factor, which shows that logarithmic formula has obvious advantages in practical application. (2) subsequently, according to the dielectric properties of loose mixture materials, The complex permittivity is measured by the resonator perturbation method, and the TM0n0 mode cylindrical resonator testing system is made, and a simple experimental platform for heating is set up. Then the algorithm was calibrated with quartz, polytetrafluoroethylene and water. Two groups of 10 oil sand samples with different water content were tested at room temperature. The test results are analyzed and it is found that the oil content has no obvious influence on the test results, but the water content is the key factor affecting microwave loss. (3) finally, the advantages of microwave heating technology are described, which should be industrialized. Aiming at 915MHz industrial microwave source, a scheme of using open coaxial resonator system as heating vessel is put forward. A coaxial cavity prototype machine is simulated and processed. The oil sand sample with volume fraction of 0.4g 0.5U 0.60.70 is filled separately at room temperature. The port voltage standing wave ratio is measured and compared with the theoretical value. It is found that the measured port reflection of the coaxial resonator is larger than the theoretical value, but the variation trend is consistent, which verifies the applicability of the logarithmic formula theory. Finally, the error term of the system is analyzed.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB30;TE31
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