CN105123893A - Method for drying jujube sheets by using heat pump - Google Patents
Method for drying jujube sheets by using heat pump Download PDFInfo
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- CN105123893A CN105123893A CN201510606009.1A CN201510606009A CN105123893A CN 105123893 A CN105123893 A CN 105123893A CN 201510606009 A CN201510606009 A CN 201510606009A CN 105123893 A CN105123893 A CN 105123893A
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- red date
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
- Y02P60/85—Food storage or conservation, e.g. cooling or drying
Abstract
The invention discloses a method for drying jujube sheets by using a heat pump. The method comprises the following steps: washing the picked fresh jujubes, removing kernels, slicing jujubes into sheets with a slicing machine, injecting water and preparing into pulp powder by using a pulping machine, spreading on a smooth glass sheet for molding, and after solidification, and flaking by using a flaker to obtain the wet jujube sheets; conveying the wet jujube sheets spread on the smooth glass sheet to a drying chamber, heating the low-temperature air to be high-temperature low-humidity air by using the heat pump, conveying the high-temperature low-humidity air into the drying chamber by using an air blower for heating, and at the same time, dewetting and heating the low-temperature high-humidity air at the outlet of the drying chamber by using the heat pump and conveying the processed air to the drying chamber for circulation; slicing the dried jujube sheets and packaging to obtain the dried jujube sheet finished product. According to the drying method provided by the invention, the characteristics of being quick in dehumidification and energy-saving of the heat pump are used fully during low-temperature drying, and the problems of the conventional jujube sheet drying method that the period is long, the cost is high, the dried jujube sheets are poor in quality and large in loss of nutrients are solved; the original flavor of the jujubes is retained to the maximum extent; the dried jujube sheet finished product prepared by using the method provided by the invention is purely natural, safe and good for health.
Description
Technical field
The invention belongs to fruit and vegetable dryness field, be specifically related to a kind of method of heat pump drying red date slices.
Background technology
China is Chan Zao big country in the world, and the cultivated area of jujube tree and the annual production of red date account for global more than 95%.Red date sugar content is higher, and fresh jujube sugar content is about 19% ~ 44%, and dry jujube sugar content is about 50% ~ 87%.Every 100g jujube pulp caloric value is about 1293KJ, is close with wheat flour (1427kJ), and containing 18 seed amino acids that needed by human body is wanted.Be rich in multivitamin in red date, especially Vc content is higher, therefore have the good reputation of " vitamin pill " simultaneously.But the maximum shortcoming of red date is that standing time is long perishable, easy damaged during transport.In red date Product processing, dryingly remain the of paramount importance elementary processing mode of current red date.
At present, the drying means of red date jujube sheet has natural seasoning and artificial seasoning usually.Natural seasoning, is commonly called as and dries, dries, although simple and convenient, with low cost, be subject to the restriction of natural conditions, especially runs into the weather of a run of wet weather, and dry run extends, and dried product quality reduces.Artificial seasoning, be divided into again hot-air seasoning, vacuum freeze-drying method, micro-wave drying method, infra-red drying method etc., heated-air drying is current Application comparison method widely, but in dry run, easily occur uneven drying, heat utilization ratio is not high, the problem that drying time is long, and higher baking temperature damages nutritional labeling in jujube sheet in baking oven, vitamin loss amount is large; Vacuum freeze drying, micro-wave drying method, consume energy high, and equipment manufacturing cost is expensive, and micro-wave drying method there will be the problem of microwave signal instability; Infra-red drying method has that firing rate is fast, and heat transfer efficiency is high, is easy to the feature controlled, but infrared coating easily aging, come off, radiance can slowly reduce, and infrared drier thermal requirements is relatively strict, and cost is high, and economy is not strong.
Summary of the invention
For above technical problem, the invention provides a kind of method of heat pump drying red date slices.The method drying efficiency is high, energy-saving effect obvious, and the jujube sheet quality better that drying obtains, nutrient component damages is little, and finished product color and luster perception is excellent.
the technical scheme that the present invention takes is as follows:
A method for heat pump drying red date slices, comprises the following steps:
(1) the new fresh date plucked is cleaned up, with stoner by extracting red date stone through washing jujube machine;
(2) thinly sliced by the clean red date slicer after stoning, red date thin slice is broken into powder slurry by water filling beater, and the mass ratio of red date thin slice and water is 1:6 ~ 8, is layered on smooth glass sheet shaping, solidifies rear flaker sheeting, obtains wet jujube sheet;
(3) the wet jujube sheet be layered on smooth glass plate obtained in step (2) is sent to hothouse, with air blast, the air of low temperature being become temperature through heat pump is 60 ~ 75 DEG C, humidity is the high temperature low-humidity air of 50 ~ 55%, send into the wet red date slices of hothouse heating, the temperature simultaneously exported by hothouse is 40 ~ 55 DEG C, humidity be 65 ~ 70% low temperature and high relative humidity air through dehumidifying heat up, send into hothouse circulation;
(4) the dry jujube sheet obtained in step (3) is carried out cutting into slices, encapsulating, obtain the dry finished product of red date slices.
The method of described heat pump drying red date slices, the thickness of the fresh red date slices described in step (2) is 5mm.
The method of described heat pump drying red date slices, on the sheet glass described in step (2), the thickness of initial red date slip is 2.5 ~ 3.5mm, and after sheeting, thickness is 2 ~ 3mm.
The method of described heat pump drying red date slices, the hothouse described in step (3) is chamber dryer, and flow level flows through, and carries out damp and hot exchange with red date slices.
The method of described heat pump drying red date slices, the drying box total length described in step (3) is 2500mm, and divide five and take out case, each case of taking out is of a size of 500mm × 300mm × 300mm, can put three layers of material.
The method of described heat pump drying red date slices, the wind speed of the high temperature low-humidity air and low temperature and high relative humidity air that enter hothouse described in step (3) is 1.5 ~ 1.8m/min.
The method of described heat pump drying red date slices, the continuous drying time is 9 ~ 12h to the wet jujube sheet described in step (3) in the drying chamber.
The method of described heat pump drying red date slices, it is 30 ~ 35% that the dried red date slices softness described in step (4) plays tough moisture content.
The method of described heat pump drying red date slices, the size of the finished product Drying Dates sheet described in step (4) is: 74mm × 20mm × 1 ~ 2mm.
compared with prior art, the present invention has following positive beneficial effect:
(1) the present invention adopts heat pump techniques Drying Dates sheet, in dry run, epidemic disaster and the air-flow velocity of circulating air can be regulated according to the characteristic of red date slices, make the evaporation rate of jujube sheet surface moisture substantially identical to surface migration speed with inside, access expansion is dry, ensures that jujube sheet has evenly good dry property.
(2) the present invention adopts heat pump techniques Drying Dates sheet, in heat pump drying device, the heat of high temperature low-humidity air is mainly derived from sensible heat contained in the Low Temperature Wet hot-air reclaiming hothouse discharge and latent heat, compared with the technology of other Drying Dates, drying efficiency is high, and energy-saving effect is obvious; And accurately independent control can be carried out to the epidemic disaster of drying medium and air-flow velocity, there is easy to operate, eco-friendly advantage.
(3) red date slices of phase isodose is respectively through heat pump drying, heated-air drying, infra-red drying and microwave drying, comparing result is as shown in table 1, known by table 1: heated-air drying is consuming time the longest, it is 2.1 times of the inventive method, the sugar content of dry rear jujube sheet and Vc content are all lower than the inventive method, and uneven white point appears in surface, energy consumption is high; After infra-red drying is consuming time, dry, sugar content is suitable with the inventive method with Vc content, but surperficial micro-volume poor flexibility, and energy consumption is higher; Microwave drying is fastest, drying is the most thorough, Vc content is the highest, but dry rear sugar content is minimum, and occurs part coking, and energy consumption is higher; Integrated comparative four kinds of drying means, the advantage that the inventive method is the most outstanding is the quality better of dry rear jujube sheet, and remain the local flavor of original red date to greatest extent, nutrient component damages is little, and finished product color and luster perception is excellent, and energy consumption is minimum.
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, and embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
embodiment 1:
A method for heat pump drying red date slices, comprises the following steps:
(1) the new fresh date plucked is cleaned up through washing jujube machine, and with stoner by extracting red date stone;
(2) the clean red date slicer after stoning is thinly sliced, water filling, the mass ratio of red date thin slice and water is 1:6 and is beaten into powder with beater to starch, be layered on be of a size of 450mm × 250mm smooth glass sheet on shaping, slurry thickness is 2.5 ~ 3mm, solidify rear flaker sheeting, thickness is 2 ~ 2.5mm;
(3) the wet jujube sheet be layered on smooth glass plate obtained in step (2) is sent in hothouse, utilizes heat pump to carry out continuous drying;
(4) in step (3) process, the wind speed entering the high temperature low-humidity air of hothouse is 1.5m/min, and temperature is 60 ~ 65 DEG C; Humidity is 50 ~ 55%; The wind speed going out the low temperature and high relative humidity air of hothouse is 1.5m/min, and temperature is 40 ~ 45 DEG C.Humidity is 65 ~ 70%; Dry total 12h consuming time;
(5) dry rear jujube sheet softness plays tough, and Drying Dates sheet, between 30-35%, carries out being sliced into 74mm × 20mm × 1mm size by moisture content, and encapsulation, obtains the dry finished product of red date slices.
embodiment 2:
A method for heat pump drying red date slices, comprises the following steps:
(1) the new fresh date plucked is cleaned up through washing jujube machine, and with stoner by extracting red date stone;
(2) the clean red date slicer after stoning is thinly sliced, water filling, the mass ratio of red date thin slice and water is 1:7 and is beaten into powder with beater to starch, be layered on be of a size of 450mm × 250mm smooth glass sheet on shaping, slurry thickness is 2.5 ~ 3mm, solidify rear flaker sheeting, thickness is 2 ~ 2.5mm;
(3) the wet jujube sheet be layered on smooth glass plate obtained in step (2) is sent in hothouse, utilizes heat pump to carry out continuous drying;
(4) in step (3) process, the wind speed entering the high temperature low-humidity air of hothouse is 1.5m/min, and temperature is 65 ~ 70 DEG C; Humidity is 50 ~ 55%; The wind speed going out the low temperature and high relative humidity air of hothouse is 1.5m/min, and temperature is 45 ~ 50 DEG C.Humidity is 65 ~ 70%; Dry total 10.5h consuming time;
(5) dry rear jujube sheet softness plays tough, and Drying Dates sheet, between 30-35%, carries out being sliced into 74mm × 20mm × 1mm size by moisture content, and encapsulation, obtains the dry finished product of red date slices.
embodiment 3:
A method for heat pump drying red date slices, comprises the following steps:
(1) the new fresh date plucked is cleaned up through washing jujube machine, and with stoner by extracting red date stone;
(2) the clean red date slicer after stoning is thinly sliced, water filling, the mass ratio of red date thin slice and water is 1:6 and is beaten into powder with beater to starch, be layered on be of a size of 450mm × 250mm smooth glass sheet on shaping, slurry thickness is 2.5 ~ 3mm, solidify rear flaker sheeting, thickness is 2 ~ 2.5mm;
(3) the wet jujube sheet be layered on smooth glass plate obtained in step (2) is sent in hothouse, utilizes heat pump to carry out continuous drying;
(4) in step (3) process, the wind speed entering the high temperature low-humidity air of hothouse is 1.5m/min, and temperature is 70 ~ 75 DEG C; Humidity is 50 ~ 55%; The wind speed going out the low temperature and high relative humidity air of hothouse is 1.5m/min, and temperature is 50 ~ 55 DEG C.Humidity is 65 ~ 70%; Dry total 9h consuming time;
(5) dry rear jujube sheet softness plays tough, and Drying Dates sheet, between 30-35%, carries out being sliced into 74mm × 20mm × 1mm size by moisture content, and encapsulation, obtains the dry finished product of red date slices.
embodiment 4:
A method for heat pump drying red date slices, comprises the following steps:
(1) the new fresh date plucked is cleaned up through washing jujube machine, and with stoner by extracting red date stone;
(2) the clean red date slicer after stoning is thinly sliced, water filling, the mass ratio of red date thin slice and water is 1:8 and is beaten into powder with beater to starch, be layered on be of a size of 450mm × 250mm smooth glass sheet on shaping, slurry thickness is 2.5 ~ 3mm, solidify rear flaker sheeting, thickness is 2 ~ 2.5mm;
(3) the wet jujube sheet be layered on smooth glass plate obtained in step (2) is sent in hothouse, utilizes heat pump to carry out continuous drying;
(4) in step (3) process, the wind speed entering the high temperature low-humidity air of hothouse is 1.8m/min, and temperature is 65 ~ 70 DEG C; Humidity is 50 ~ 55%; The wind speed going out the low temperature and high relative humidity air of hothouse is 1.8m/min, and temperature is 50 ~ 55 DEG C.Humidity is 65 ~ 70%; Dry total 10h consuming time;
(5) dry rear jujube sheet softness plays tough, and Drying Dates sheet, between 30-35%, carries out being sliced into 74mm × 20mm × 1mm size by moisture content, and encapsulation, obtains the dry finished product of red date slices.
embodiment 5:
A method for heat pump drying red date slices, comprises the following steps:
(1) the new fresh date plucked is cleaned up through washing jujube machine, and with stoner by extracting red date stone;
(2) the clean red date slicer after stoning is thinly sliced, water filling, the mass ratio of red date thin slice and water is 1:7 and is beaten into powder with beater to starch, be layered on be of a size of 450mm × 250mm smooth glass sheet on shaping, slurry thickness is 3 ~ 3.5mm, solidify rear flaker sheeting, thickness is 2.5 ~ 3mm;
(3) the wet jujube sheet be layered on smooth glass plate obtained in step (2) is sent in hothouse, utilizes heat pump to carry out continuous drying;
(4) in step (3) process, the wind speed entering the high temperature low-humidity air of hothouse is 1.8m/min, and temperature is 65 ~ 70 DEG C; Humidity is 50 ~ 55%; The wind speed going out the low temperature and high relative humidity air of hothouse is 1.8m/min, and temperature is 50 ~ 55 DEG C.Humidity is 65 ~ 70%; Dry total 11h consuming time;
(5) dry rear jujube sheet softness plays tough, and Drying Dates sheet, between 30-35%, carries out being sliced into 74mm × 20mm × 2mm size by moisture content, and encapsulation, obtains the dry finished product of red date slices.
Claims (7)
1. by a method for heat pump drying red date slices, it is characterized in that, comprise the following steps:
(1) new fresh date is cleaned up, with stoner by extracting red date stone through washing jujube machine;
(2) thinly sliced by the red date slicer after stoning, red date thin slice is broken into powder slurry by water filling beater, and red date is thin
The mass ratio of sheet and water is 1:6 ~ 8, spreads shaping on the glass sheet, solidifies rear flaker sheeting, obtain wet jujube sheet;
(3) the wet jujube sheet obtained in step (2) is sent to hothouse, becomes through heat pump with the air of air blast by low temperature
The high temperature low-humidity air that temperature is 60 ~ 75 DEG C, humidity is 50 ~ 55%, sends into the wet red date slices of hothouse heating, the temperature simultaneously exported by hothouse is 40 ~ 55 DEG C, low temperature and high relative humidity air that humidity is 65 ~ 70% heats up through dehumidifying, send into hothouse and recycle;
(4) the dry jujube sheet obtained in step (3) is carried out cutting into slices, encapsulating, obtain the dry finished product of red date slices.
2. the method for heat pump drying red date slices according to claim 1, is characterized in that, on the sheet glass described in step (2), the thickness of initial red date slip is 2.5 ~ 3.5mm, and after sheeting, thickness is 2 ~ 3mm.
3. the method for heat pump drying red date slices according to claim 1, is characterized in that, the hothouse described in step (3) is chamber dryer, and flow level flows through, and carries out damp and hot exchange with red date slices.
4. the method for heat pump drying red date slices according to claim 1, is characterized in that, the wind speed of the high temperature low-humidity air and low temperature and high relative humidity air that enter hothouse described in step (3) is 1.5 ~ 1.8m/min.
5. the method for heat pump drying red date slices according to claim 1, is characterized in that, the continuous drying time is 9 ~ 12h to the wet jujube sheet described in step (3) in the drying chamber.
6. the method for heat pump drying red date slices according to claim 1, is characterized in that, after the drying described in step (4), the moisture content of red date slices is 30 ~ 35%.
7. the method for heat pump drying red date slices according to claim 1, is characterized in that, the size of the finished product Drying Dates sheet described in step (4) is: 74mm × 20mm × 1 ~ 2mm.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105685865A (en) * | 2016-01-18 | 2016-06-22 | 江苏大学 | Method for infrared pre-dehydrating processing of red date slices |
| CN105716375A (en) * | 2015-12-26 | 2016-06-29 | 河南勃达微波装备股份有限公司 | Method for drying platycodon root by using heat pump |
| CN107080202A (en) * | 2017-06-13 | 2017-08-22 | 邢夺伟 | A kind of dry processing method of small bell jujube |
| CN107692114A (en) * | 2017-10-19 | 2018-02-16 | 王凤娇 | A kind of processing method of red date slices |
| CN110800942A (en) * | 2018-08-06 | 2020-02-18 | 湖南省农产品加工研究所 | Dried date processing method based on heat pump drying and ozone sterilization |
| CN111165565A (en) * | 2020-02-11 | 2020-05-19 | 杭州淘道科技有限公司 | Low-temperature drying sterilization method, dried jujube and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105716375A (en) * | 2015-12-26 | 2016-06-29 | 河南勃达微波装备股份有限公司 | Method for drying platycodon root by using heat pump |
| CN105716375B (en) * | 2015-12-26 | 2018-08-10 | 河南勃达微波装备股份有限公司 | A kind of method of heat pump drying campanulaceae |
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| CN107080202A (en) * | 2017-06-13 | 2017-08-22 | 邢夺伟 | A kind of dry processing method of small bell jujube |
| CN107692114A (en) * | 2017-10-19 | 2018-02-16 | 王凤娇 | A kind of processing method of red date slices |
| CN110800942A (en) * | 2018-08-06 | 2020-02-18 | 湖南省农产品加工研究所 | Dried date processing method based on heat pump drying and ozone sterilization |
| CN111165565A (en) * | 2020-02-11 | 2020-05-19 | 杭州淘道科技有限公司 | Low-temperature drying sterilization method, dried jujube and preparation method thereof |
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Application publication date: 20151209 |