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流化床换热器的传热性能与设备的结构参数和操作参数有关

 

  粒子在流化床换热器的含率,对传热系数有很大的影响=传热系数随粒食半的增加而增大。这是因为粒含率增加,导致粒子传热壁面的碰掩时的总停留,叫和接触面枳增加,方为泡核沸腾提供更多的汽化核心,另方面使壁而形成的汽泡跃离拉变小。跃离周期加快,强化了泡核沸腾传热。另外粒体积分宰的增加,单位时间内与壁面碰撞的粒子数增加,由壁面传递给粒子的热量增加,强化了固体粒子与传热壁曲+间的对流传热此外,粒子体枳分率的增加,减少了流动边界和,热边界层的厚度,强化了对流传热系数增加,这些作用的综合效果使得汽液固相流沸腾传热系数增大。

The content of the particles in the fluidized bed heat exchanger has a great influence on the heat transfer coefficient = the heat transfer coefficient increases with the increase of the grain size. This is because the particle holdup, resulting in an increase in the particle heat transfer wall touch mask when the total residence, called and the increase of contact area for nucleate boiling provided more nucleation sites, on the other hand the wall and the formation of bubble jump pulled away from the smaller. The jump period is accelerated, and the heat transfer of bubble boiling is enhanced. Slaughter also particle size increased, number of particles per unit time and collision with wall increased by the wall surface transfer to the heat of the particle increases, strengthen the convection heat transfer between solid particles and the wall heat transfer Qu + in addition, particle trifoliate rate increase, reducing the boundary flow and thermal boundary layer thickness, strengthen the convection heat transfer coefficient increased, the combined effect of these effects the vapor liquid solid flow boiling heat transfer coefficient increases.

流化床换热器的传热性能与设备的结构参数和操作参数有关。在设备定的情况下,流体的循环速度固体粒子的种类尺寸含率以及热通量等因素对流化床换热器化床换热器的传热系数随流量的增加而增大=这是因为流量增加,流体的湍动程度增大,流动边界员变薄,强化了对流传热。对相循环流化床换热器而言,卞体循环流量的增加还可使固体粒子的循环速度加快,粒广与壁161碰撞的频率及强度增人,增加了汽化核心,汽泡跃离壁面的频申增大,强化了床,1与传热壁面之间的对流传热及饱和泡核沸腾传热。流化床换热器中,固体粒子的选择很承要,不同种类的固体粒子,其传热系数有较大的方,般来说,粒子的导热系数密度比热较大时,传热系数较大。

The heat transfer performance of the fluidized bed heat exchanger(www.2018918.com) is related to the structural parameters and operating parameters of the equipment. In equipment, liquid circulation velocity of the solid particle size category containing rate and heat flux in fluidized bed for heat exchanger bed for the heat transfer coefficient of heat exchanger with the increase of the flow rate increases = this is because of the increased flow and fluid turbulence degree increases and flow boundary thinning, can improve the convection heat transfer. For phase circulating fluidized bed heat exchanger is concerned, Bian body circulation flow rate increase can also speed up the circulation of the solid particles, particle and wall 161 collision frequency and intensity is increased, increased the nucleation, bubble jump off the wall frequency application increases, strengthen the bed, between 1 and wall heat transfer convection heat transfer and saturated nucleate boiling heat transfer. In the fluidized bed heat exchanger, the solid particles are very well chosen, and the heat transfer coefficient of different kinds of solid particles is larger than that of the heat transfer coefficient.

  此外,粒+的润湿性能对沸腾传热系数也有定的影响,粒广的润湿性能差,沸腾传热系数较大。粒的尺寸增大,传热系数增大。闪为人的粒子以。打较大的动能,对流体边界的破坏强度大,利丁传热系数的提。但固体粒厂有个适宜的比例,般情况下,管径与粒径之比应大尸8.

In addition, the effect of particle size on the boiling heat transfer coefficient was also determined。 The wetting property of the particle was poor and the boiling heat transfer coefficient was large。 The size of particles increases and heat transfer coefficient increases。 The particles of a man's。 A large kinetic energy of the fluid boundary breaking strength, greater heat transfer coefficient。 But there is a suitable proportion of solid grain plant, as the case, the diameter and size of the ratio of the body should be 8

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