摘  要:循環流化床氣固兩相流數值模擬是通過建立數值模型以求更方便的研究循環流態化傳熱傳質性質，從而用以加強循環流化床鍋爐高效運作，提高能源利用率的技術。這種技術的推廣與研究可以預測流場中的各種參數，再現流場的運動及變化特性，準確反映顆粒在外力作用下的受力及運動特征。因此，在循環流化床鍋爐的研究和開發、尤其是大型化研究中，數值模擬成為一種不可或缺的研究方法和工具，具有重要的學術意義和實用價值。一個理想的循環流化床鍋爐數值模擬應當包含對循環化床對氣固相流顆粒進行了特點分析。

　　　再次，對氣固兩相流流化床鍋爐系統的一系列物理過程和化學過程的模型描述。對試驗而言，建模的投資要小得多，然而其通用性、靈活性和快速性卻可以使鍋爐設計者的設計建立在各種可能方案的充分比較、篩選和優化的基礎上，其好處和經濟效益是顯而易見的。

　　　論文首先，對本課題的研究背景和立項意義進行了論述；簡要介紹了循環流化床組成結構以及優點。

　　　其次，對多相流研究現狀進行了綜述。氣固兩相流的的基礎理論進行了簡要陳述，并結合循環流相流研究方法和氣固兩相流的主要參數進行了闡述。并且進行物理建模。其后詳述了數值模擬所依托的fluent軟件包。

　　　最后，對于氣固兩相流從原來的三類物理（對應于求解的數值模型）模型，即：連續介質模型、離散顆粒模型以及流體擬顆粒模型，側重于離散顆粒模型，并在以后的設計中，利用歐拉—拉格朗日數學方法，將氣固流態分為兩種形式：一種是將空氣場利用歐拉方法進行模擬；另一種是將流場利用拉格朗日方法進行模擬。并主要運用fluent軟件進行簡單顆粒的模擬計算簡單的直筒流態化模型。

關鍵詞：循環流化床  氣固兩相流   fluent  離散顆粒模型  歐拉—拉格朗日

Abstract:The numerical simulation of gas-solid two-phase flow on Circulating fluidized bed make a study of cycle fluidized heat and mass transfer properties according to  establish numerical model more conveniently ,in addition to strengthen the efficient of circulating fluidized bed boiler’s operations and improve the efficiency of energy technologies. This technology promotion and research can predict the various parameters flow field, reappearance the sports and variations of flow field, this way can reflect particles’ stress and movement characteristics in forces accurately. Therefore, during the circulating research and development of fluidized bed boiler in, especially Large-scale research, numerical simulation become a indispensable research methods and tools, has  an important effect on  academic value and practical value. An ideal circulating fluidized bed boiler in numerical simulation of circulating fluidized bed will contain gas-solid phase flow of the characteristic analysis particles.

　　　Next, we will describe a series of two physical processes and chemical process model of a gas-solid fluidized boiler system. As for test, modeling is much smaller, yet its commonality, flexibility and power makes boiler designers design based on various may plan fully comparison, screening and optimization, and on the basis of its benefits and economic benefits are obvious.

　　　Firstly, we will talk about the research background and significance of this subject; making a briefly introduction of the circulating fluidized bed’s structure and advantages.

　　　Secondly, do a review of multiphase flow. The foundation theory of Gas-solid two-phase are discussed briefly in the presentations, and combined with circular flow phase research methods and solid two-phase flow of main parameters is discussed in this paper. And also we will make a physical modeling. Thenceforth we will introduce the Fluent software packages which can support numerical simulation.

　　　Finally, there are three original physical model (corresponding to the solution of the numerical model) of gas-solid two-phase flow, namely: continuum model, discrete particle model and fluid fitting, stresses in discrete particle model particle model, and in the later design, use Euler - Lagrange mathematical gas-solid flow pattern is divided into two types: one kind is air field simulated using the Euler method; Another will flow field using Lagrange method is simulated. And using simple particles fluent soft software simulation calculation simple straight canister fluidized model mainly.

Keywords: circulating fluidized bed    gas-solid two-phase flow fluent   discrete particle model    Euler - Lagrange