Performance Test of Bench-Scaled Adsorption System for Generating High Temperature Steam from Waste Water

Yoshiaki Kawakami, Masayuki Tanino, Takasago Thermal Engineering Co., Ltd., JP, Yoshio Abe, Kasumi Ito, ThyssenKrupp Otto, JP, Kenji Marumo, Toshiyuki Aoyama, Morimatsu Industry Co., Ltd., JP, Tsuguhiko Nakagawa, Okayama Prefectural University, JP, Yoshinori Itaya, Gifu University, JP, Koichi Nakaso, Jun Fukai
Kyushu University, Japan

Keywords: steam-generation, adsorption-heat-pump, unused-thermal-energy

While large amount of hot waste water in the range 60-90 ˚C is released from many industrial processes, steam is demanded for heat sources of the manufactured processes. The system to generate steam from low-grade waste heat is therefore required for the effective utilization of energy. In this study, a novel steam generation process using a direct heat exchange system with adsorbent-water pair is proposed. Contacting water with adsorbent makes excess water evaporate due to the release of adsorption heat from adsorbent. Because this system does not require any heat exchangers, increment in packing density of adsorbent particles in the reactor is expected. The purpose of this study is to investigate the novel steam generation system using adsorbent-water pair. Cycle operation which consists of steam generation process and regeneration process has been studied experimentally and numerically using laboratory-scaled equipments of steam generator for 0.3 kg-adsorbent/unit. Based on this study, bench-scaled adsorption type steam recovery system for 10-15 kg-adsorbent/unit were constructed. Operation condition of the steam generation process and the regeneration process of this system was investigated. Continuous steam generation operation was moreover examined using this equipment of the three generator units.

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