Numerical Simulation Study on Water Distribution for Waste Heat Utilization System with Jacketed Coke Oven Riser

摘要

Abstract The utilization of waste heat in the coke oven riser is an important means of energy reuse in the coking industry, it has a good development prospect in the field of waste heat recovery in China. The uniformity of flow distribution in water distribution system for waste heat utilization system (WHU) with the jacketed coke oven riser (JR) is an important factor affecting the normal and steady operation of WHU with JR. Too much water flow in the JR will lead to excessive heat transfer, tar condensation, black smoke phenomenon, and pollution of the environment. Too little water flow in the JR will cause serious damage to the JR and even threaten the safe operation of the coke oven. Therefore, the uneven water flow in the water distribution for the WHU with JR seriously restricts the development of this technology. So in this work, a 3D CFD model was established to study how to improve the flow distribution uniformity of water distribution for the WHU with JR. The key factors such as inlet velocity and pressure, the diameter of the main inlet pipe, outlet pipe and branch pipes, the number of JRs in a subgroup and different inlet and outlet methods were studied. The results showed that the larger the inlet velocity, the larger the diameter of the main inlet and outlet pipe, the smaller the diameter of the branch pipe, and the more number of the JRs in a subgroup, the better the uniformity of flow distribution. The value of the inlet pressure had no obvious effect on it. Among different inlet and outlet methods, Mid2-type is the most uniform method in flow distribution. The research results can provide theoretical guidance for future engineering practice and promote the development of WHU technology with JR.