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    流化床換熱器的傳熱性能與設備的結構參數和操作參數有關

     

      粒子在流化床換熱器的含率,對傳熱系數有很大的影響=傳熱系數隨粒食半的增加而增大。這是因為粒含率增加,導致粒子傳熱壁面的碰掩時的總停留,叫和接觸面枳增加,方為泡核沸騰提供更多的汽化核心,另方面使壁而形成的汽泡躍離拉變小。躍離周期加快,強化了泡核沸騰傳熱。另外粒體積分宰的增加,單位時間內與壁面碰撞的粒子數增加,由壁面傳遞給粒子的熱量增加,強化了固體粒子與傳熱壁曲+間的對流傳熱此外,粒子體枳分率的增加,減少了流動邊界和,熱邊界層的厚度,強化了對流傳熱系數增加,這些作用的綜合效果使得汽液固相流沸騰傳熱系數增大。

    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.

    流化床換熱器的傳熱性能與設備的結構參數和操作參數有關。在設備定的情況下,流體的循環速度固體粒子的種類尺寸含率以及熱通量等因素對流化床換熱器化床換熱器的傳熱系數隨流量的增加而增大=這是因為流量增加,流體的湍動程度增大,流動邊界員變薄,強化了對流傳熱。對相循環流化床換熱器而言,卞體循環流量的增加還可使固體粒子的循環速度加快,粒廣與壁161碰撞的頻率及強度增人,增加了汽化核心,汽泡躍離壁面的頻申增大,強化了床,1與傳熱壁面之間的對流傳熱及飽和泡核沸騰傳熱。流化床換熱器中,固體粒子的選擇很承要,不同種類的固體粒子,其傳熱系數有較大的方,般來說,粒子的導熱系數密度比熱較大時,傳熱系數較大。

    The heat transfer performance of the fluidized bed heat exchanger(www.yybnkj.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+的潤濕性能對沸騰傳熱系數也有定的影響,粒廣的潤濕性能差,沸騰傳熱系數較大。粒的尺寸增大,傳熱系數增大。閃為人的粒子以。打較大的動能,對流體邊界的破壞強度大,利丁傳熱系數的提。但固體粒廠有個適宜的比例,般情況下,管徑與粒徑之比應大尸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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