Effect of double vacancy near the heating wall on the heating characteristics of particle pile

Abstract Reducing carbon emissions is the focal issues of common concern all over the world. It is of great significance for reducing carbon emissions to explore the effect of double vacancy adjacent to the heating wall on heating characteristics of particle pile. A heat exchange model with double vacancy was constructed, which was verified by a particle reactor experimental system. Effect of the change of the double-vacancy's position on the heating characteristics was studied. The results show that with the increase of the distance between the double vacancy and the heating wall, the thermal resistance of the selected area increases first and then decreases. The minimum heat flux and heating efficiency of the selected area, the maximum thermal resistance of the selected area, and the maximum area ratio of the vacancy affected area all appear when the distance from the vacancy to the heating wall is 1 time the particle size. With the increasing of the relative distance between the double vacancy, the total heat flux on the heating wall increases, the thermal resistance of the particle reactor decreases. When the relative distance of double-vacancy increases to 8 times the particle size, the mutual influence between the double-vacancy disappears.