Potential of a direct contact adsorption heat pump system for generating steam from waste water

Abstract

SUMMARY An adsorption heat pump with a direct contact system for steam generation has been developed and the feasibility of the proposed system was confirmed both theoretically and experimentally. The basic cycle for the system has been proposed to use zeolite–water working pairs in the p‐T‐x equilibrium curve. To generate steam above 150°C from low‐energy level water at 80°C, a direct contact adsorption heat pump prototype was constructed. The experimental results show that steam could be generated by the direct contact system and the relationship between the amount of water adsorbed and the change in temperature with time is discussed. This study is expected to serve as a foundation for developing continuous adsorption heat pump systems for steam generation. Copyright © 2011 John Wiley & Sons, Ltd.

Pre‐adsorption of low‐grade waste steam for high‐temperature steam generation by using composite zeolite and long‐term heat storage salt of MgSO 4

“…Steam temperature in this work is the only one above 200°C. The average GTL in present study is close to 100°C, which is also the highest compared with other similar work . This demonstrates that the system has an outstanding ability to enhance low‐grade heat sources.…”

Experimental and simulation analysis of low temperature heat sources driven adsorption air conditioning, refrigeration, integrating ammonia, and organic expanding power generation

“…The results show that the internal cooling/heating can improve adsorption and desorption performance significantly, and the 10% to 40% of air humidity can be adsorbed by the internal cooling. Oktariani et al proposed one direct adsorption heat pump system to produce steam. The results present that 150°C of steam can be generated.…”

Performance of a Novel Steam Generation System Using a Water-zeolite Pair for Effective Use of Waste Heat From the Iron and Steel Making Process

“…In particular, the authors adopted a direct heat exchange method for the adsorption heat pump system to overcome the low heat transfer rate between the packed bed and heat transfer fluid. [3][4][5][6] Figure 2 shows the schematic of the cycle for the novel adsorption heat pump. At the start of the process, the steam generator with a dry adsorbent is evacuated using a vacuum pump to avoid air-entrained steam.…”

“…In our previous studies, superheated steam at 0.1-0.4 MPa was generated using water at 80°C and dry gas at 130°C with laboratory-scale apparatus using zeolite as the adsorbent. [3][4][5] In addition, the generation of steam under the cyclic operation of steam generation and regeneration processes was demonstrated experimentally. 6) In this study, the performance of the system using a water-zeolite pair was numerically investigated in terms of the mass of steam generated during the cyclic operation.…”