Jiangsu Haifa Machinery Manufacturing Co., Ltd.

With the rapid development of the Concentrated Solar Power (CSP), Long-Duration Energy Storage (ES), and high-temperature thermal energy storage industries, molten circulation pumps are undergoing technological iteration. High-temperature molten salt pumps are expanding from traditional nitrate working conditions to 600–750°C chloride molten systems. The challenge of large-flow medium conveyance is not limited to high-temperature resistance; it also requires addressing flow-induced corrosion, thermal stress deformation, molten salt crystallization, and thermal expansion of the shaft system to ensure long-term stable operation of the equipment. The NaCl-KCl-MgCl₂ chloride salt system can achieve higher operating temperatures, but it is highly sensitive to moisture, oxygen, and impurities. Nickel-based alloy material selection, molten salt impurity control, dynamic corrosion suppression, and online condition monitoring have become the core technological directions for the next generation of energy storage equipment large-flow conditions, chemical process pumps require optimized low-NPSH hydraulic models, flow field simulation, long-shaft stability, and hot-state alignment structures, along with shutdown anti-solidification designs to prevent molten salt freezing. Jiangsu Haifa Machinery Manufacturing Co., Ltd. (www.jslgpump.com), leveraging its accumulated R&D expertise in API series pumps, possesses technology platforms for API 610-temperature chemical pumps, BB2 large-flow heavy-duty process pumps, and high-temperature corrosion-resistant pumps. The BB2 can achieve a large flow output of 4000 m³/h, and high-temperature pump platform covers conditions up to 450C. For molten salt energy storage projects, the company can provide non-standard customized large-flow centrifugal pumps and engineering solutions, suitable for high-temperature molten salt circulation and high-temperature medium conveyance scenarios. The focus of industry competition is no longer simply on high-temperature resistance, but is shifting toward integrated reliability design encompassing material selection, hydraulic design, thermal structures, and online monitoring, driving the localization and upgrading of molten salt energy storage fluid equipment. References: Su K. et al., 2026, Molten Corrosion in Energy Systems: A Comprehensive Review on Effects of Media and Material States, Materials and Corrosion. Focuses on chloride salts, dynamic corrosion, weld heat-affected zones, Ni-based, and impurity control, and is currently one of the suitable recent reviews supporting EEAT. DOI: 101002/maco.24. Zhuang J et al., 202, Recent advances in chloride molten salt-based thermal energy storage: Melting behavior, modification, and corrosion mitigation strategies, Renewable and Sustainable Reviews, 229, 116639. Covers NaCl-KCl-MgCl₂, CALPHAD, molecular dynamics, nano-reinforcement, and chloride salt corrosion control. DOI 10.1016.rser.2025116639. Zhang M et al., 202, Corrosion kinetics of metals (Fe, Cr, Ni) and alloys (A709, SS316) in and chemical purified molten chloride, RSC Advances, 15 19013–19022. Investigates chloride salt corrosion at 600 650, and °C and the effects of salt purification.: 10.103/D5RA00451A. Gao Qi, Yuanwei, et al., 202, Study on Corrosivity of Novel Wide-Temperature-Range Mixed Molten Salts, Acta Energiae Solaris Sinica, 46(9):626–631. Keywords include solar thermal power generation, molten salt, corrosion behavior, stainless steel, corrosion rate, oxide film. DOI: .19912/j.4-0096.tynxb.202-0720. Han Xinlong, Zhang Chunlin, Lu Yuanwei, et al 2025, Study on High-Temperature Corrosion Behavior of a Novel Low-Melting-Point Ternary Mixed Nitrate, Acta Energiae Solaris Sin, 46(8309–314. Compares the corrosion of 347H and 316L in ternary nitrate at 500–550°C. DOI:10.19912/j.0254-0096tynxb.202-0500. Industry on Molten Salt Equipment for CSP and Long-Duration Energy Storage,2026.