【摘要】：微波負壓干燥是一種新型的干燥技術,其干燥原理是：在負壓狀態(tài)下,置于交變電場中的物料的水分子被極化后運動加劇,水分子之間摩擦生熱,使物料表面水分蒸發(fā),物料內部和外部形成了溫度梯度和濕度梯度,從而加速水分從物料由內向外遷移,實現(xiàn)干燥目的。由于微波功率、真空度、干燥時間、物料性質等參數(shù)對物料的干燥質量密切相關,因此,對微波負壓干燥技術的工藝研究成為干燥領域的研究熱點。 本課題以筒子紗為干燥對象,分析筒子紗在微波負壓干燥過程中,工藝參數(shù)對其干燥特性的影響,旨在降低能耗,提高干燥效率和質量。此外,還將微波負壓干燥技術應用到人造板的甲醛快速釋放試驗,以拓展將微波負壓干燥技術在其他領域的應用。主要內容有： 1、微波負壓干燥技術的研究。主要研究傳統(tǒng)的干燥方法和干燥設備;微波干燥技術的加熱原理、傳熱機理、能耗計算；負壓干燥的基本原理；微波負壓干燥的特點和應用前景。 2、微波負壓干燥試驗設備的優(yōu)化。完成微波負壓干燥設備主要性能的測定、輸出功率計算、擊穿場強校核；對微波負壓試驗設備進行優(yōu)化,包括負壓系統(tǒng)的優(yōu)化,磁控管散熱的改進,微波場均勻性的優(yōu)化；制定微波負壓試驗設備的操作規(guī)范。 3、完成筒子紗微波負壓干燥工藝試驗。以筒子紗為烘干對象,研究干燥時間對微波負壓干燥效果的影響,完成試驗過程單因素分析。采用響應面分析法、筒子紗正交試驗分析法,完成微波負壓干燥的多因素影響試驗分析。此外,完成復合木質板材甲醛的快速釋放工藝試驗。 4、微波負壓干燥的效益分析。完成微波負壓干燥技術的經(jīng)濟效益分析,包括微波負壓干燥設備的能源利用率和熱效率計算,微波負壓干燥與熱風干燥的能源利用率比較,微波負壓干燥經(jīng)濟性分析。
[Abstract]:Microwave negative pressure drying is a new drying technology. The drying principle is: under negative pressure, the water molecules placed in the alternating electric field become more and more active, and the friction between the water molecules generates heat, which evaporates the water content on the surface of the material. The temperature gradient and humidity gradient are formed inside and outside the material, which accelerates the moisture transfer from the inside to the outside of the material and realizes the purpose of drying. Because microwave power, vacuum, drying time and material properties are closely related to the drying quality of materials, the study of microwave negative pressure drying technology has become a hot spot in the field of drying. In order to reduce energy consumption and improve drying efficiency and quality, the influence of process parameters on drying characteristics of bobbin yarn during microwave negative pressure drying was analyzed. In addition, microwave negative pressure drying technology was applied to the rapid release test of formaldehyde in wood-based panels to expand the application of microwave negative pressure drying technology in other fields. The main contents are as follows: 1. Microwave negative pressure drying technology. This paper mainly studies the traditional drying methods and drying equipment, the heating principle, heat transfer mechanism, energy consumption calculation of microwave drying technology, the basic principle of negative pressure drying; The characteristics and application prospect of microwave negative pressure drying. 2. Optimization of microwave negative pressure drying test equipment. The main performance of microwave negative pressure drying equipment is determined, the output power is calculated, the breakdown field strength is checked, the microwave negative pressure test equipment is optimized, including the optimization of negative pressure system, the improvement of magnetron heat dissipation, and the optimization of microwave field uniformity. To establish the operation specification of microwave negative pressure test equipment. 3, to complete the microwave negative pressure drying process test of bobbin yarn. The effect of drying time on microwave negative pressure drying was studied, and the single factor analysis was completed. Response surface analysis and orthogonal test were used to analyze the effect of microwave negative pressure drying. In addition, complete the rapid release process test of composite wood plate formaldehyde. 4, the benefit analysis of microwave negative pressure drying. The economic benefit analysis of microwave negative pressure drying technology is completed, including the calculation of energy utilization ratio and thermal efficiency of microwave negative pressure drying equipment, the comparison of energy utilization ratio between microwave negative pressure drying and hot air drying, and the economic analysis of microwave negative pressure drying.
【學位授予單位】：東華大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB4

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