發(fā)布時間：2018-01-22 12:28

  本文關(guān)鍵詞： 垃圾衍生燃料 流化床 數(shù)值研究 兩相流 曳力模型　出處：《沈陽航空航天大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來流化床技術(shù)的應(yīng)用領(lǐng)域已經(jīng)成功擴展到生物質(zhì)和固體廢物燃料的處理方面,由于流化床具有燃燒效率高,污染排放低,燃料適應(yīng)性廣的優(yōu)點,已經(jīng)成為固廢焚燒處理的主要設(shè)備。本文在實驗的基礎(chǔ)上,用基于顆粒動力學(xué)理論(Kinetic Theory of Granular Flow,KTGF)的歐拉-歐拉兩相流模型和燃燒模型,分別研究了在床料顆粒在流化床中的冷態(tài)流動特性,床料與垃圾衍生燃料(Refuse Derived Fuel,RDF)的混合流動特性以及流化床傳熱和燃燒特性的影響因素。對比分析了氣固流動中,氣體和固體顆粒之間相互影響的規(guī)律,包括氣泡隨時間的演變機理。以及不同曳力模型在本模型中的應(yīng)用對環(huán)核結(jié)構(gòu)的影響,流化速度對床內(nèi)流場分布和床層膨脹的影響,并且得到了實驗的良好驗證。對于傳熱和燃燒狀態(tài)下的速度場,溫度場,濃度場的分布對燃燒、換熱效率及污染物排放的影響。并與實驗值進行了對比驗證。本文有關(guān)研究結(jié)果與試驗相符合,對RDF在流化床中燃燒的實際工程應(yīng)用具有重要參考價值。
[Abstract]:In recent years, the application of fluidized bed technology has been successfully expanded to biomass and solid waste fuel treatment, because fluidized bed has the advantages of high combustion efficiency, low pollution emissions, wide fuel adaptability. It has become the main equipment for solid waste incineration treatment. In this paper, based on particle dynamics theory, Kinetic Theory of Granular Flow is used. KTGF-based Euler-Euler two-phase flow model and combustion model were used to study the cold flow characteristics of particles in fluidized bed. The mixed flow characteristics of Refuse Derived fuel and the influencing factors of heat transfer and combustion characteristics of fluidized bed are compared and analyzed in gas-solid flow. The interaction between gas and solid particles, including the evolution mechanism of bubbles with time, and the effect of different drag models on the ring nuclear structure in this model. The effect of fluidization velocity on the flow field distribution and bed expansion in the bed is well verified by experiments. For the velocity field, temperature field and concentration field under the heat transfer and combustion state, the distribution of the velocity field and the concentration field on the combustion. The effects of heat transfer efficiency and pollutant emission are compared with the experimental data. The results of this paper are in agreement with the experimental results, and have important reference value for the practical engineering application of RDF combustion in fluidized bed.
【學(xué)位授予單位】：沈陽航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X705;TK16
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本文編號：1454666