The OBF process is widely studied as an alternative ironmaking process, due to the social pressure of energy and environment at present. A comprehensive mathematical model of the OBF process is established, which is based on material and exergy balances. The process parameters of the OBF with different oxygen enriched blast were calculated through the model. The calculation results demonstrated that the material balance of carbon input in the OBF process decreased by 6.7% (OBF-I) and 22.4% (OBF-II) compared to the TBF process. Also, the industrial oxygen consumption increased from 185.88 m 3 (OBF-I) to 228.32 m 3 (OBF-II). The exergy output and the total exergy loss of the OBF-I process decreased by 1.5% and 5.6%, respectively, and those in the OBF-II process decreased by 16.60% and 30.81%. Due to the exergy indices in OBF-II process all improved, the OBF-II process was a significantly efficient ironmaking process compared to the TBF.

Coffee machines have become very popular in recent years, but their lack of functionality still requires a great deal of manual maintenance, which inevitably has many hidden dangers. Coffee machines with radio frequency identification systems (RFID) are more effective in reducing losses due to manual labor, and increasing efficiency. However, collision problems in RFID systems can seriously affect the performance of the system. In this paper, we propose a specific solution to such problems by proposing a collision-free process technology for arrayed multipoint devices. And this technique is successfully applied in a coffee machine. Through design experiments, after 10,000 repeated tests, no collision error occurred. The problem of collisions in coffee machines with RFID mechanisms has been successfully solved.