How to improve the efficiency of waste heat recovery in the steel industry in China?

Waste heat recovery is a method of minimizing energy usage and environmental pollution by using various methods to recover energy lost and unused in industrial production. As one of China's major metallurgical industries, the pollution and resource waste generated by the steel industry make it necessary to improve the efficiency of waste heat recovery. In this dissertation, the difficulties currently encountered by waste heat recovery can be summarized from two aspects: the difficulty in obtaining patent licenses and the continued lack of increase in low-temperature waste heat recovery efficiency. Among them, the difficulty in obtaining patents not only increases the cost of steel manufacturers economically, but also makes it difficult to carry out research to improve the efficiency of waste heat recovery smoothly, because the research process may involve patented technologies. As the cooling medium used in the organic Rankine cycle, the performance in safeguarding the environment and energy-saving effect of R236ea coincide with the current difficulties encountered in China in the utilization of waste heat recovery. The achievement of the Kalina cycle in recovering low-grade waste heat makes it a possible alternative to the organic Rankine cycle. However, the problem of difficulty in obtaining patent licenses is difficult to solve. In the subsequent promotion process, the current imbalance in the scale advancement of the steel and metallurgical industry in different regions and the scale gap of Chinese steel mills may lead to differences in the applicable waste heat recovery methods. In the future, the conclusions of this dissertation need to be tested to confirm the feasibility of alleviating China's rapid energy consumption.