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Water-free surface silanization on composite zeolite 13X/MgSO4 in a direct-contact adsorption heat pump for stable steam generation

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  • Chen, Tingting
  • Xue, Bing
  • He, Xiaoran
  • Wei, Ruixun
  • Li, Guangyao

Abstract

Direct-contact method has been utilized in an open-loop adsorption heat pump based on composite adsorbent for high-temperature steam generation. Deliquescence problem arisen from the loss of salt in adsorbent under high humidity environment limits the stable performance during adsorption process. The composite zeolite was functionally modified with octyltrimethoxysilane (OTMOS) agent during water-free process based on liquid chemical grafting method. Measurement results from XRF (X-Ray Fluorescence) confirm the stable amount of salt is kept inside the modified zeolite. Characterization results from BET (Brunauer-Emmett-Teller) reveal the facts that pore volume and diameter are reduced simultaneously with the decrease in surface area. During regeneration dry air at 130 °C is used for removing water out of the packed bed filled with S8-7.5 (the composite adsorbent modified with 7.5 % OTMOS). During generation process superheated steam at 200 °C is obtained directly from hot water at 72 °C. GTL (Gross Temperature Lift) reaches 115 °C. COPh (coefficient of performance for heating) and SHP (specific heating power) for steam generation are increased by 16.2 % and 10.4 %, respectively after modification. The corresponding increases in system indicators stem from the promotion of steam mass, as adsorption abilities for composite zeolite are maintained well during direct contact with liquid water after modification.

Suggested Citation

  • Chen, Tingting & Xue, Bing & He, Xiaoran & Wei, Ruixun & Li, Guangyao, 2024. "Water-free surface silanization on composite zeolite 13X/MgSO4 in a direct-contact adsorption heat pump for stable steam generation," Renewable Energy, Elsevier, vol. 221(C).
    • Handle: RePEc:eee:renene:v:221:y:2024:i:c:s0960148123017093
    DOI: 10.1016/j.renene.2023.119794
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    References listed on IDEAS

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