Efficient waste heat recovery system for high-temperature solid particles based on heat transfer enhancement

A series of efficient heat recovery methods including PCHEE-A, PCHEE-K and a double-medium system is proposed in this paper, which is to provide comprehensive solutions for high temperature particle in different situations. The PCHEE-A and PCHEE-K can increase the heat transfer area and heat transfer coefficient, through extending specific area to 1000-2000 m(2)/m(3) and inducing turbulence in the heat transfer boundary, respectively. For the double-medium system which can achieve deep heat recovery and utilization, a multi-dimensional thermal resistance model is established to conduct heat analysis. Based on the model, Pareto frontier optimization of the double-medium system is carried out, and the optimal medium arrangement as well as the heat load distribution is derived. By combing the above methods, three typical systems (single-medium vertical plate-type with PCHEE-A, double-medium vertical tube-type and horizontal-type with PCHEE-K) are established and can get heat recovery efficiency at around 80%.