Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Scinor Water Technology Co., Ltd., Beijing, 100083, China.
Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, 100083, China.
Environ Res. 2022 Sep;212(Pt C):113458. doi: 10.1016/j.envres.2022.113458. Epub 2022 May 13.
The widespread use of fossil energy emits a large amount of carbon dioxide, leading to the greenhouse effect and global warming. The essence of reducing carbon emissions is to achieve higher-quality sustainable development. The recycling of waste heat in the iron and steel industry is of great significance to reducing carbon emissions. Aiming at the problem of insufficient utilization of gas in iron and steel industry and the development of seawater desalination industry, a water-electricity cogeneration and thermal membrane coupling technology is established. Low-temperature multi-effect distillation seawater desalination device is directly connected with steam turbine generator, which uses gas to generate electricity. After generating electricity, negative pressure exhaust at the end of steam turbine is used for seawater desalination. The thermal efficiency of the system is increased to over 80%, the waste heat is effectively utilized, and the carbon emission in the thermal desalination process is reduced. At the same time, the high-efficiency removal and resource utilization of salt in concentrated seawater are realized. The recovery ratio of freshwater is over 55%, the salt content of freshwater is below 500 mg/L, and the salt content of seawater concentrated by membrane method can reach 79,450 mg/L. A new comprehensive utilization and recycling system of seawater has been constructed to realize efficient recycling of energy resources and promote the development process of carbon emission reduction.
化石能源的广泛使用会排放大量二氧化碳，导致温室效应和全球变暖。减少碳排放的本质是实现更高质量的可持续发展。钢铁行业余热的回收对减少碳排放具有重要意义。针对钢铁行业煤气利用不足和海水淡化行业发展的问题，建立了水电联产与热膜耦合技术。将低温多效蒸馏海水淡化装置直接与汽轮发电机组相连，利用煤气进行发电。发电后，利用汽轮机末端的负压排气进行海水淡化。该系统的热效率提高到 80%以上，有效利用了余热，减少了热法海水淡化过程中的碳排放。同时，实现了浓缩海水中盐分的高效去除和资源利用。淡水的回收率超过 55%，淡水的盐含量低于 500mg/L，膜法浓缩的海水盐含量可达 79450mg/L。构建了新的海水综合利用和循环回收系统，实现了能源资源的高效回收，促进了减排的发展进程。
