Abstract
In order to explore a suitable drying device and method for heat-sensitive pulp materials, a refractance window dehydration (RW) device and an infrared refractance window dehydration (IR-RW) device were designed and manufactured with hot water and carbon fiber infrared plate as heat sources, respectively. The drying experiments were carried out with carrot pulp and also compared with the hot air drying. Both of the RW and IR-RW device were composed of feeding system, heating system, cooling system and unloading system. The control system was made of touch screen and a series of slave controllers. A control network was formed base on Modbus protocol to precisely control the parameters of drying process. The experimental results showed that the design scheme of RW and IR-RW drying devices was feasible and the work program was also reliable. When the drying temperature was 95 ℃, both of IR and IR-RW drying devices can achieve rapid dehydration,and the 2 mm thick carrot pulp can be dried in 5 min. The material temperature raised rapidly to 60~75 ℃ at the initial drying stage, and then gradually became stable in the middle drying stage, and decreased in the later drying stage. The maximum temperature of the material was 15~25 ℃ lower than that of the heating source of drying. In the preheating stage, it took about 2 minutes for the IR-RW device to reach the set temperature, while it took about 30 minutes for the hot water to reach the set temperature in the RW drying process. The quality attributes of the RW and IR-RW dried samples were not significantly different (P＜0.05), and had the color difference (△E) and loss of carotene are about 17, 10% respectively. The required time for hot air drying at 75 ℃ was nearly 13 min, and the loss of carotene was 32.58%. The HA drying samples had obvious browning and bonding phenomenon, and the color difference (△E) of HA samples was 37.5. The research results provided important information about pulp drying with RW and IR-RW drying technologies.
Publication Date
2-18-2023
First Page
108
Last Page
115, 141
DOI
10.13652/j.issn.1003-5788.2020.09.019
Recommended Citation
ZHANG, Wei-peng; NIE, Yi-fan; XIAO, Hong-wei; ZHENG, Zhi-an; JU, Hao-yu; and HUANG, Zhi-gang
(2023)
"Design and drying test of refractance window drying equipment,"
Food and Machinery: Vol. 36:
Iss.
9, Article 19.
DOI: 10.13652/j.issn.1003-5788.2020.09.019
Available at:
https://www.ifoodmm.cn/journal/vol36/iss9/19
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