干法粒化后的高炉渣颗粒余热回收工艺主要以空气为冷却介质,由于空气的比热容小从而导致热效率低,因此,提出用自流床余热锅炉来回收高温炉渣颗粒的余热.基于CFD软件,将流动的颗粒当作连续的黏性流体,建立了一个三维数学模型,对颗粒绕流圆管传热的过程进行数值模拟,并验证了模型的正确性,研究了颗粒人口速度、水入口速度以及水人口温度对余热锅炉换热效果的影响规律.数值模拟结果表明:增大颗粒和水入口速度,可提高换热效果;增大水入口温度,传热系数没有变化,但热回收率减小.

Chemical looping air separation is a new method to separate oxygen from air. In the process, oxygen carrier releases oxygen in the reduction reactor and absorbs oxygen in the oxidation reactor. The reduction is endothermic, and the oxidation is exothermic. The heat transfer from oxidation reactor to reduction reactor is essential to design the CLAS process with low energy consumption. In this paper, the optimization CLAS process of CuO/ZrO2 oxygen carrier was established based on thermal analysis and pressure analysis. In the system, the heat can achieve self-balance with little heat supplied from outside. The effects of the technological parameters on the system energy consumption were investigated using Aspen Plus software. The results show that the energy consumption decreases with reduction temperature increasing and oxidation temperature decreasing. Moreover, the smaller the difference of temperature between the two reactors is, the lower energy consumption is. Under negative pressure, with the decreasing reduction pressure, the energy consumption decreases. Under positive pressure, with the increasing oxidation pressure, the energy consumption decreases firstly and then increases. The optimization operating parameters are obtained. The lowest energy consumption of the system is 0.132 kWh m−3 at the conditions of 990 °C reduction and 1000 °C oxidation temperatures and 0.5 atm. reduction and 1.7 atm. oxidation pressures.

The chemical looping oxygen production system was designed based on thermal analysis and pressure analysis . Then Aspen Plus chemical process simulation software is used to simulate and analyze the influence of reactor temperature and pressure on system energy consumption in order to optimize the oxygen production system. The results show that under ordinary pressure with the increasing of oxygen reactor temperature the system energy consumption decreases;whereas with the increasing of oxidation reactor temperature the energy consumption increases;and also the smaller the difference of temperature between two reactors is, the lower the system energy consumption is. Under negative pressure with the decreasing of the pressure of oxygen reactor, the system energy consumption decreases. However, under positive pressure with the increasing of the pressure of oxidation reactor, the energy consumption first decreases and then increases. Therefore, the optimization of operating parameters can be obtained in the oxygen production system where oxygen reactor runs under negative pressure and oxidation reactor under positive pressure.

Currently air is the main heat transferring medium to recover the waste heat of the blast furnace (hereinafter referred to as BF) slag particles after dry granulation, which has many disadvantages, such as small heat transfer coefficient, low thermal efficiency and so on. Using gravity bed waste heat boiler to recover the high temperature BF slag particles was proposed. This paper used Fluent, constructing a three dimensional numerical model and considering flowing particles as continuous viscous flow, to simulate the heat transfer process of high temperature BF slag particles around tubes. The influences of the inlet velocity of particles and water were investigated. The numerical simulation results showed that the heat transfer effect enhanced with the increasing of the inlet velocity of particles and water, and the heat recovery rate of the former dropped, while the latter rose.