钢铁行业中低温烟气余热相变储热装置特性分析

Characteristics analysis of the phase change thermal storage equipment for medium and low temperature flue gas from steel industry

现阶段中国钢铁行业中低温余热资源总量丰富,但各类余热能级跨度大、温度分布范围宽,并且余热资源存在间歇性与不稳定性,现有技术已无法满足要求。相变储热以其储热密度高、储释热过程温度恒定等优势成为研究热点。该文介绍了利用NaNO3/SiO2为相变储热材料,设计制造相变储热实验装置,并对该装置的特性进行分析。实验结果显示,在测试条件下,该套装置储热时最大储热效率为68.3%,放热时最大放热效率约为60%。

Presently, Chinas steel industry works with rich media and low heat resources. Because the industry wastes a wide span of heat energies, operates over a large temperature range, and is intermittent and unstable, the existing technology of heat recovery is insufficient. Phase-changing thermal storage materials have become a research hotspot because their heat storage density is high and their temperature remains constant during heat storage and release. This paper introduces the design and manufacture of test equipment based on NaNO3/SiO2 as the phase-change thermal storage material and analyzes its characteristics. In an experimental evaluation of the test equipment, the highest heat storage efficiency was 68.3% and the highest exothermal efficiency reached approximately 60%.