转速对三分仓回转式空气预热器热力性能的影响  

Influence of Rotational Speed on Thermal Performance of Tri-sector Rotary Air Preheaters Based on Finite Difference Method

作　　者：陈珣[1] 段学农[1] 杨益[1] 王敦敦 

机构地区：[1]国网湖南省电力公司电力科学研究院,湖南长沙410007

出　　处：《热能动力工程》2016年第6期85-91,126,共7页Journal of Engineering for Thermal Energy and Power

摘　　要：基于有限差分法,将三分仓回转式空气预热器沿旋转方向周向展开,在蓄热元件单元和流体之间划分网格,通过建立每一有限单元内流体和蓄热单元间热平衡方程,利用改良的高斯塞德尔迭代方法计算得到蓄热元件的流体温度场分布。以某600 MW机组三分仓回转式空气预热器为例,详细分析了转速变化时,流体和金属温度场分布、ABS(硫酸氢铵)沉积区域等的变化趋势和规律。研究结果显示:(1)蓄热元件温度随转动角度分布的非线性特征,随转速降低而增加,可以用非稳定换热影响因子Π表征,各个分仓的Π值不同;(2)不同转速下,蓄热元件温度分布曲线,在加热和冷却周期内,各存在一个相对稳定的平衡位置;(3)三分仓空气预热器出口一次风、二次风平均温度随转速的变化趋势,与转子旋向和各空气分仓角度有关。Based on finite difference method,the tri-sector rotary regenerative air-preheater was spread along the rotor's circular side and mesh between the matrix elements and the fluids was generated.Then the matrix and fluid temperature fields were obtained according to the energy balance equation and using an improved Gauss-Sidel arithmetic.For a600 MW unit tri-sector rotary regenerative air-preheater,a detailed analysis was carried out for the temperature field distributions of the fluid and metal and ammonium bisulfate( ABS) deposition area with different the rotational speeds.The results showed that,1) The nonlinear characteristics of matrix temperature distribution along with the rotation angle increases while the rotational speed decreases,which can be described by the unsteady heat transfer correction factor Π,and for each sector the value of factor Π is different.2) There exist relatively stable balance positions during both heating and cooling periods,which are the intersection points of matrix temperature profile curves with different rotational speeds.3) The effect on average outlet temperatures of primary and secondary air channels from rotor rotational speed depends on the rotor rotation direction and the sector angle division.

关 键 词：三分仓回转式空气预热器 转速 热力性能 有限差分法 硫酸氢铵 非稳定换热 

分 类 号：TK284.1[动力工程及工程热物理—动力机械及工程]