Abstract
The primary energy demand increases, but a large amount of waste heat resources were not effectively used. To explore the influence of particle stacking structure on waste heat recovery process, CFD method was used to simulate. An unsteady heat transfer model of two particles was established, effect of particle stacking angle on heat transfer characteristics of the particles close to the wall under different initial temperature conditions was studied. Results show that: higher initial temperature, resulting in increased heat transfer time, the larger particle stacking angle causes the shortening of heat transfer time. When initial temperature is 1073 K, the average wall heat flux shows a trend of rapid decline first and then a slow one. At the same moment, the larger stacking angle causes smaller particle average temperature. The change of particle stacking angle shows a greater impact on the temperature of the particles close to adiabatic wall. The increase in the stacking angle resulting in better heat transfer characteristics between particles.
Highlights
The rapid growth of the global economy has promoted the rapid development of the industrial field, which increases the consumption of primary energy
Results show that: higher initial temperature, resulting in increased heat transfer time, the larger particle stacking angle causes the shortening of heat transfer time
The change of particle stacking angle shows a greater impact on the temperature of the particles close to adiabatic wall
Summary
The rapid growth of the global economy has promoted the rapid development of the industrial field, which increases the consumption of primary energy. A large number of high-temperature solid particles are produced in the industrial field [2]. If these particles are directly discharged, it will cause environmental pollution and energy waste. High-temperature solid materials are randomly stacked in the packed bed. The irregularities of the stacked structure and the diversity of particle sizes and shapes make the research move hard. The research on the heat transfer characteristics of the packed bed from regular arrangement [3] to irregular arrangement [4], from single particle size [5] to irregularly shaped particles [6], from the simplified numerical model [7] to the actual production [8]. The results may provide basic theoretical support for the high-temperature solid particle waste heat recovery technology
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