Method for drying carrots by oxygen-free heat pump

A heat pump drying and carrot technology, applied in the direction of dehydration preservation of fruits/vegetables, food processing, etc., can solve the problem of easy loss of β-carotene, and achieve the effects of shortening drying time, easy control, and low energy consumption

Inactive Publication Date: 2012-12-19
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that carrots are prone to oxidation under hot wind or sunlight and the active ingredient β-carotene is easy to lose, the invention provides a method for drying carrots with an anaerobic heat pump

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Carrot pretreatment: Select 8 kg of carrots with bright colors, uniform sizes, no rot, insect pests and mechanical damage. After washing, peel off the skin of the carrots to a thickness of 0.5 mm, then cut off the root and head of the carrots by 3 cm each, and cut the remaining columnar carrots into pieces. Into a disc shape, the slice thickness is 2mm;

[0020] Lay the cut carrot slices on the horizontally arranged material tray in the drying room, the interval between the carrot slices and the slices is 1cm, place 1kg carrot slices on each layer of material tray, and close the drying room after placing;

[0021] Turn on the power of the drying equipment in the drying room, let the drying wind flow through the material tray in the horizontal direction, and set the wind speed flowing through the material tray to 0.5m / s;

[0022] Then feed nitrogen into the drying chamber to reduce the percentage of oxygen in the drying chamber to form an oxygen-free environment with an ...

Embodiment 2

[0025] Carrot pretreatment: select 9 kg of carrots with bright colors, uniform sizes, no rot, insect pests and mechanical damage. After washing, peel off the carrot skin to a thickness of 0.5mm, then cut off the carrot root and head by 3cm each, and cut the remaining columnar carrots into pieces. Into a disc shape, the slice thickness is 2.5mm;

[0026] Lay the cut carrot slices on the horizontally arranged material tray in the drying room, the interval between the carrot slices and the slices is 1.2cm, place 1.2kg carrot slices on each layer of material tray, and close the drying room after placing;

[0027] Turn on the power supply of the drying equipment in the drying room, make the drying wind flow through the material tray in the horizontal direction, and set the wind speed flowing through the material tray to 1m / s;

[0028] Then feed nitrogen into the drying chamber to reduce the percentage of oxygen in the drying chamber to form an oxygen-free environment with an oxygen...

Embodiment 3

[0031] Carrot pretreatment: select 10kg of carrots with bright colors, uniform size, no rotten insects and mechanical damage, after washing, peel off the carrot skin to a thickness of 0.5mm, then cut off the root and head of the carrot by 3cm each, and cut the remaining columnar carrots Into a disc shape, the slice thickness is 3mm;

[0032] Lay the cut carrot slices on the horizontally arranged material tray in the drying room, the interval between the carrot slices and the slices is 1.5cm, place 1.5kg carrot slices on each layer of material tray, and close the drying room after placing;

[0033] Turn on the power of the drying equipment, let the drying wind flow through the material tray in the horizontal direction, and set the wind speed flowing through the material tray to 1.5m / s;

[0034] Then feed nitrogen into the drying chamber to reduce the percentage of oxygen in the drying chamber to form an oxygen-free environment with an oxygen content of less than 5%, and then st...

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Abstract

The invention relates to a method for drying carrots, in particular to a method for drying carrots by an oxygen-free heat pump. By the method, nitrogen gas is filled into a drying chamber of the heat pump so as to generate an oxygen-free environment, and the carrots can be dried in the oxygen-free environment. On the basis of quality research on dried carrot slice products and energy reduction, the nitrogen gas is used as drying medium to dry carrot slices in the oxygen-free heat pump, so that beta-carotene in the dried carrot products is high in reservation ratio, the dried carrot products are orange in tinct and palatefull in flavor, and quality of the dried carrot slices is improved. By the method for drying carrots by the oxygen-free heat pump, drying time is shortened, and production efficiency is improved. Besides, the method for drying carrots by the oxygen-free heat pump is low in drying cost, fine in drying effect, easy to control and capable of realizing real sanitary large-scale continuous automatic production.

Description

technical field [0001] The invention relates to a method for drying carrots, in particular to a method for drying carrots with an anaerobic heat pump. Background technique [0002] my country is a large agricultural production country. In 2004, my country's vegetable output reached 550 million tons. In 2005, my country's vegetable output was 562.84 million tons. Among many vegetables, carrots have the most extensive planting area in my country, and there are fewer diseases and insect pests in the carrot planting process, so there is less agricultural pollution and high yield. Carrot is a nutritious home-cooked vegetable, but fresh carrots are not easy to preserve and are limited by seasons. At present, in order to keep the original color and nutritional content of carrots basically unchanged, it is easy to store and transport, and can effectively adjust the low and high seasons of carrot production. The development of carrots is mainly to dry and make dehydrated vegetables...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A23B7/02
CPCY02P60/85
Inventor 朱文学樊金玲吴佳宋宇刘云宏罗磊李欣杜琳宋会娟种翠娟
Owner HENAN UNIV OF SCI & TECH
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