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Title: Energy-efficient regenerative liquid desiccant drying process

Abstract

This invention relates to the use of desiccants in conjunction with an open loop drying cycle and a closed loop drying cycle to reclaim the energy expended in vaporizing moisture in harvested crops. In the closed loop cycle, the drying air is brought into contact with a desiccant after it exits the crop drying bin. Water vapor in the moist air is absorbed by the desiccant, thus reducing the relative humidity of the air. The air is then heated by the used desiccant and returned to the crop bin. During the open loop drying cycle the used desiccant is heated (either fossil or solar energy heat sources may be used) and regenerated at high temperature, driving water vapor from the desiccant. This water vapor is condensed and used to preheat the dilute (wet) desiccant before heat is added from the external source (fossil or solar). The latent heat of vaporization of the moisture removed from the desiccant is reclaimed in this manner. The sensible heat of the regenerated desiccant is utilized in the open loop drying cycle. Also, closed cycle operation implies that no net energy is expended in heating drying air.

Inventors:
; ;
Publication Date:
OSTI Identifier:
7040281
Patent Number(s):
US 4189848
Assignee:
Dept. of Energy
Resource Type:
Patent
Resource Relation:
Patent File Date: Filed date 4 Aug 1977; Other Information: PAT-APPL-821,868
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; CROPS; DRYING; DESICCANTS; REGENERATION; CLOSED-CYCLE SYSTEMS; DESIGN; ENERGY RECOVERY; LITHIUM CHLORIDES; OPEN-CYCLE SYSTEMS; SOLAR DRYING; ALKALI METAL COMPOUNDS; CHLORIDES; CHLORINE COMPOUNDS; HALIDES; HALOGEN COMPOUNDS; LITHIUM COMPOUNDS; LITHIUM HALIDES; RECOVERY; 320304* - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Waste Heat Recovery & Utilization

Citation Formats

Ko, S M, Grodzka, P G, and McCormick, P O. Energy-efficient regenerative liquid desiccant drying process. United States: N. p., 1980. Web.
Ko, S M, Grodzka, P G, & McCormick, P O. Energy-efficient regenerative liquid desiccant drying process. United States.
Ko, S M, Grodzka, P G, and McCormick, P O. Tue . "Energy-efficient regenerative liquid desiccant drying process". United States.
@article{osti_7040281,
title = {Energy-efficient regenerative liquid desiccant drying process},
author = {Ko, S M and Grodzka, P G and McCormick, P O},
abstractNote = {This invention relates to the use of desiccants in conjunction with an open loop drying cycle and a closed loop drying cycle to reclaim the energy expended in vaporizing moisture in harvested crops. In the closed loop cycle, the drying air is brought into contact with a desiccant after it exits the crop drying bin. Water vapor in the moist air is absorbed by the desiccant, thus reducing the relative humidity of the air. The air is then heated by the used desiccant and returned to the crop bin. During the open loop drying cycle the used desiccant is heated (either fossil or solar energy heat sources may be used) and regenerated at high temperature, driving water vapor from the desiccant. This water vapor is condensed and used to preheat the dilute (wet) desiccant before heat is added from the external source (fossil or solar). The latent heat of vaporization of the moisture removed from the desiccant is reclaimed in this manner. The sensible heat of the regenerated desiccant is utilized in the open loop drying cycle. Also, closed cycle operation implies that no net energy is expended in heating drying air.},
doi = {},
url = {https://www.osti.gov/biblio/7040281}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {2}
}