CN103727746B - The temperature-controlled process of food vacuum freeze drying equipment heating process - Google Patents
The temperature-controlled process of food vacuum freeze drying equipment heating process Download PDFInfo
- Publication number
- CN103727746B CN103727746B CN201310640102.5A CN201310640102A CN103727746B CN 103727746 B CN103727746 B CN 103727746B CN 201310640102 A CN201310640102 A CN 201310640102A CN 103727746 B CN103727746 B CN 103727746B
- Authority
- CN
- China
- Prior art keywords
- temperature
- heating
- section
- threshold values
- charge
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Abstract
The temperature-controlled process of food vacuum freeze drying equipment heating process, vacuum freeze-drying machine is utilized to carry out heat drying, dry heat temperature section controls, first paragraph heating-up temperature is 100 DEG C ~ 130 DEG C, most back segment heating-up temperature is material maximum permissible temperature, hop count is determined between 4 ~ 12 sections, and middle each section of heating-up temperature reduces continuously; Set the temperature of charge threshold values of each section, first paragraph temperature of charge threshold values is 0 DEG C ~ 30 DEG C, and most back segment temperature of charge threshold values is material maximum permissible temperature, and middle each section of temperature of charge threshold values raises continuously; Heat in process at every section, the time used when temperature of charge measured value reaches the temperature of charge threshold values of place section is this section of duration, then enters next section and to heat process; After most back segment temperature of charge measured value reaches material maximum permissible temperature, maintain 20 ~ 150 minutes, terminate dry run; Identical material is undertaken adding temperature control can carry out vacuum freeze drying to this kind of food by above-mentioned heating-up temperature, segmented mode, each section of duration.
Description
Technical field
The present invention relates to the control technology of vacuum freeze, particularly a kind of temperature-controlled process of food vacuum freeze drying equipment heating process.
Background technology
Vacuum freeze drying (abbreviation freeze-drying) is placed in the dryness storehouse of maintenance vacuum by freezing material, makes the water sublimed in material and obtain the method for dried foods by heating.The method that existing food vacuum freeze drying equipment (abbreviation freeze dryer) generally all adopts contactless double-side radiation to heat.Namely material disc is positioned between heating plate, and material disc does not directly contact with heating plate, and have electric heater or internal circulation heat-conducting medium (as water or heat conduction wet goods) in heating plate, heating plate transfers heat to material mainly through the mode of radiation heat transfer.
Freeze dryer needs the heating power controlling heating plate in dry run.The sublimation process of the larger then moisture of heating power is faster on the one hand.On the other hand because material top layer heat and mass condition is good, water sublimed is very fast, and nexine heat and mass condition is poor, water sublimed is also slower, the temperature of the material of stem portion dewatered must be made in dry run not exceed maximum permissible temperature, therefore occur that heating power is unsuitable excessive after stem portion, to prevent the temperature of top layer material too high at material.The maximum permissible temperature of material is also disintegration temperature, is the temperature ensureing that internal batch composition is not damaged in dry run, is determined by material self component characteristic and quality requirement.According to above-mentioned analysis, the control strategy of freeze dryer heating process should be ensureing to heat with heating power large as far as possible under temperature of charge is no more than the prerequisite of material maximum permissible temperature.
The heating power controlling heating plate realizes by controlling heating-up temperature, and the heating-up temperature of freeze dryer refers to the temperature of the temperature of heater plate surface or the heat-conducting medium of the interior circulation of heating plate.Heating-up temperature is higher, and the heat provided for material in the unit interval is more, and rate of drying is faster.
At present, two kinds of methods are mainly taked to the control of heating-up temperature in freeze-drying process.First method manually sets heating-up temperature, and adjust the setting value of heating-up temperature at any time in dry run.Second method presets some sections of freeze-dry process curves in advance, every segment process curve includes design temperature and runs duration, when program enters certain section of curve, heating-up temperature performs by this section of design temperature, until after reaching setting operation duration the running time of this section, program enters next section of curve motion automatically.
Aforementioned first method can not the automatic control of implementation procedure, manually adjusts setting value in time after needing to be judged the situation in running by operating personnel.Generally in dried material, insert some temperature sensor probes in advance to measure temperature of charge, dry run starts rear operating personnel constantly adjust heating-up temperature setting value according to the change of temperature of charge.Whole process need ensures that temperature of charge is no more than material maximum permissible temperature.The experience of this method operating personnel and subjective judgement play a part very important, and randomness is comparatively large, and easily causes maloperation in process.This method is applicable to sample experiments or trial production.
Aforementioned second method can the automatic control of implementation procedure, but before pre-programmed curve, need the setting value being determined process curve in advance by aforementioned first method through several times experiment.And to new freeze-dry process process, namely for different material kinds, or the condition such as the shape of material, thickness and sabot amount is when changing, freeze-dry process curve originally can not adjust automatically accordingly according to the change of material condition, needs again to determine new freeze-dry process curve by first method through several times experiment.
Existing food freeze-drying factory to the control of freeze dryer heating-up temperature usually by aforementioned two kinds of methods combining, a small-sized freeze dryer is utilized to be tested by first method, obtain the freeze-dry process curve of material, then in large-scale freeze dryer, use this freeze-dry process curve negotiating second method automatically to control.Direct large-scale freeze dryer can be avoided like this to carry out testing and the waste of a large amount of materials that may occur and the loss of the energy.But which not only adds investment and the experimentation of experimental facilities, also because the heat transfer boundary condition (as thermal source, heating board structure and heat dissipation environment etc.) of small-sized freeze dryer and large-scale freeze dryer has difference, the freeze-dry process curve utilizing small-sized freeze dryer to test to obtain is not often best concerning large-scale freeze dryer, likely affects product quality, increases energy resource consumption or reduce production efficiency.
Summary of the invention
The object of this invention is to provide in a kind of control easy and simple to handle, easy, heating process without the need to operating personnel judge manual mode operation, energy-conservation, materials quality is not affected, the temperature-controlled process of food vacuum freeze drying equipment heating process that operating efficiency is high, overcome the deficiencies in the prior art.
The temperature-controlled process of food vacuum freeze drying equipment heating process of the present invention, be utilize vacuum freeze-drying machine to carry out heat drying, step is as follows:
A, the heating-up temperature of dry run is carried out Discrete control, first paragraph heating-up temperature is 100 DEG C ~ 130 DEG C, and most back segment heating-up temperature is material maximum permissible temperature, between 40 DEG C ~ 70 DEG C, hop count is determined between 4 ~ 12 sections, and middle each section of heating-up temperature reduces continuously;
B, set the temperature of charge threshold values of each section, first paragraph temperature of charge threshold values is 0 DEG C ~ 30 DEG C, and most back segment temperature of charge threshold values is material maximum permissible temperature, and between 40 DEG C ~ 70 DEG C, middle each section of temperature of charge threshold values raises continuously;
C, heat in process at every section, the time used when temperature of charge measured value reaches the temperature of charge threshold values of place section is this section of duration, then enters next section and to heat process;
D, maintain 20 ~ 150 minutes when most back segment temperature of charge measured value reaches material maximum permissible temperature, terminate dry run;
E, identical material are undertaken adding temperature control can carry out vacuum freeze drying to this kind of food by above-mentioned heating-up temperature, segmented mode, each section of durations.
In dry run, before the dry material of dehydration occurs, the heating-up temperature of freeze dryer sets by equipment maximum heating ability; After dry material occurs, then start the rate of climb suitably controlling temperature of charge, record the temperature of the dry bed of material in the course of the work, and it and the temperature of charge threshold values set are compared, after temperature of charge reaches setting temperature of charge threshold values, reduce heating-up temperature, thus reduce the rate of climb of temperature of charge.Heating-up temperature and the temperature of charge threshold values of setting take setting stepwise, the setting heating-up temperature of each section reduces successively, the setting temperature of charge threshold values of each section then raises successively simultaneously, and final stage setting heating-up temperature is equal to material maximum permissible temperature with setting temperature of charge threshold values.When all temperature of charge and heating-up temperature are equal in error range, then after maintaining a period of time, dry run terminates.For at least running a freeze-drying process and obtaining the situation of ripe heating process curve, then can measure temperature of charge, each section of heating runs duration and sets by actual motion duration before respectively.
The present invention is further illustrated below, and method is as follows:
Freeze dryer heating process curve is divided into some sections, is generally 4 ~ 12 sections, every section comprises setting heating-up temperature, setting runs duration and setting temperature of charge threshold values totally three setting values.
The numerical value of each section of setting heating-up temperature successively decreases in order successively, the numerical value of first paragraph setting heating-up temperature is the heating-up temperature value making equipment reach maximum heating ability, number range is generally 100 DEG C ~ 130 DEG C, the numerical value of final stage setting heating-up temperature is the maximum permissible temperature value of material, and number range is generally 40 DEG C ~ 70 DEG C.
Each section of setting temperature of charge threshold values increases progressively in order successively, and its value is greater than 0 DEG C, and is no more than the maximum permissible temperature value of material.
During each section of heating process curve motion, the heating-up temperature of freeze dryer is run by this section setting heating-up temperature, until when the actual run time of this section reaches this section of setting operation duration, program judges whether to there is effective temperature of charge measured value.Effective temperature of charge measured value refers to the temperature value within normal temperature of charge scope (being generally-30 ~ 70 DEG C) obtained by temperature of charge sensor measurement, and it is selected as effectively on control inerface simultaneously.If there is no effective temperature of charge measured value, then program enters next section of heating process curve motion automatically; If there is effective temperature of charge measured value, then the peak among effective temperature of charge measured value and setting temperature of charge threshold values are compared, if the peak of effective temperature of charge measured value does not reach setting temperature of charge threshold values, then heating-up temperature continues to run with this section setting heating-up temperature, until when the peak of effective temperature of charge measured value is equal to or greater than the setting temperature of charge value of this section, this section of end of run, program enters next section.
The computer heating control program of freeze dryer runs each segment process heating curves in order successively, when after final stage technique heating curves end of run, and if there is no effective temperature of charge measured value, then dry run terminates; If there is effective temperature of charge measured value, then all effective temperature of charge measured values and heating-up temperature close to or equal after maintain the holding time of one section of setting again after dry run terminate, to reduce the impact of temperature of charge inhomogeneities, holding time of setting is generally 20 ~ 150 minutes.
At the end of dry run, control program sends corresponding prompting to operating personnel, and before end heating-up temperature automatic control program, the heating-up temperature of freeze dryer maintains the setting heating-up temperature operation of final stage always.
When using the control method of above-mentioned heating-up temperature, if for be new freeze-dry process process, need before dried material is frozen, at least respectively insert a temperature sensor probe on material moisture distillation top layer faster and the slower nexine of distillation.If institute's processing materials had at least run a freeze-drying process, and the conditions such as the shape of material, thickness and sabot amount are substantially constant, then do not need to insert temperature sensor probe in freeze-drying process in material.Every section of setting operation duration of freeze-dry process curve is set as this section of actual motion duration in the heating process run.
The control method of freeze dryer heating-up temperature provided by the invention meets and is ensureing to carry out the requirement of heating with heating power large as far as possible under temperature of charge is no more than the prerequisite of material maximum permissible temperature, and avoid existing freeze dryer and need when obtaining new freeze-dry process curve to carry out the process of many experiments through manual setting heating-up temperature, the automaticity that freeze dryer heating process is controlled is higher, be easier to operation, decreases cost of human resources.For large-scale freeze dryer, the heating technique parameter obtained by the inventive method with tested compared with the heating technique parameter that obtains by small-sized freeze dryer, more meet food technology requirement and actual operating mode, be conducive to saving the consumption of the energy and improving the operating efficiency of equipment.
Detailed description of the invention
The temperature-controlled process of food vacuum freeze drying equipment heating process of the present invention, be utilize vacuum freeze-drying machine to carry out heat drying, step is as follows:
A, the heating-up temperature of dry run is carried out Discrete control, first paragraph heating-up temperature is 100 DEG C ~ 130 DEG C, and most back segment heating-up temperature is 40 DEG C ~ 70 DEG C, and hop count is determined between 4 ~ 12 sections, and middle each section of heating-up temperature reduces continuously;
B, set the temperature of charge threshold values of each section, first paragraph temperature of charge threshold values is 0 DEG C, and most back segment temperature of charge threshold values is 40 DEG C ~ 70 DEG C, and middle each section of temperature of charge threshold values raises continuously;
C, heat in process at every section, the time used when temperature of charge measured value reaches the temperature of charge threshold values of place section is this section of duration, then enters next section and to heat process;
D, maintain 20 ~ 150 minutes when most back segment temperature of charge measured value reaches 40 DEG C ~ 70 DEG C, terminate dry run;
E, identical material are undertaken adding temperature control can carry out vacuum freeze drying to this kind of food by above-mentioned heating-up temperature, segmented mode, each section of durations.
Control for the temperature of the freeze-drying heating process of apple, further illustrate the present invention, apple is after the pretreatment process such as cleaning, sterilization, peeling, stoning, section, and uniform spreading enters in freeze dryer pallet, and the useful load of unit tray area is 10kg/m
2.The needle-like temperature sensor probe of two band pulling and inserting type joints is inserted respectively in the apple flakes of a pallet top layer and bottom wherein.Put into by material disc and freeze storehouse and lower the temperature, then send in dryness storehouse by the material disc freezed, the vacuum in storehouse to be dried reaches after working vacuum degree requires, the heating plate of freeze dryer is heated up, beginning heating process.
The freeze-dry process curve of heating process is divided into 10 sections, and the setup parameter of each section comprises setting heating-up temperature, setting runs duration and setting temperature of charge threshold values, and as shown in table 1, the maximum permissible temperature of this apple flakes is 50 DEG C.
Table 1 heating parameters setting (new technology)
Heating schedule brings into operation from the 1st section, heating-up temperature is run by this section setting heating-up temperature (120 DEG C), until after reaching setting operation duration (100min) running time of this section, the peak of the temperature of charge measured value measured by four temperature sensors compares with setting temperature of charge threshold values (10 DEG C), as the former is more than or equal to the latter, then heating schedule enters the 2nd section; As the former is less than the latter, then heating-up temperature continues to perform by this section setting heating-up temperature (120 DEG C), until after the peak of four temperature of charge measured values reaches setting temperature of charge threshold values (10 DEG C), program enters the 2nd section.
By that analogy, heating schedule runs successively by each section of sequence number, and to the last one section (the 10th section) runs complete.
After all temperature of charge measured values are equal within the scope of measure error with setting heating-up temperature (50 DEG C), maintain 40 minutes again, dry run terminates, control program sends to freeze dryer operating personnel the prompting that dry run terminates, before operating personnel's finishing control program, the setting heating-up temperature of freeze dryer remains unchanged.
Program records the actual motion duration of in above-mentioned control method running each section automatically, obtains the freeze-drying heating technique parameter of this kind of apple, as shown in table 2.
Table 2 heating parameters setting (maturation process)
The freeze-drying process of follow-up this kind of apple does not need to insert temperature sensor in material, heating process is carried out temperature by the parameter of table 2 and is controlled, because there is not effective temperature of charge measured value, the control of setting temperature of charge threshold values on heating process does not affect.
Claims (1)
1. a temperature-controlled process for food vacuum freeze drying equipment heating process, is characterized in that: utilize vacuum freeze-drying machine to carry out heat drying, step is as follows:
A, the heating-up temperature of dry run is carried out Discrete control, first paragraph heating-up temperature is 100 DEG C ~ 130 DEG C, most back segment heating-up temperature is material maximum permissible temperature, material maximum permissible temperature is between 40 DEG C ~ 70 DEG C, hop count is determined between 4 ~ 12 sections, and first paragraph reduces continuously to the heating-up temperature of most back segment;
B, set the temperature of charge threshold values of each section, first paragraph temperature of charge threshold values is 0 DEG C ~ 30 DEG C, most back segment temperature of charge threshold values is material maximum permissible temperature, and material maximum permissible temperature is between 40 DEG C ~ 70 DEG C, and first paragraph raises continuously to the temperature of charge threshold values of most back segment;
C, heat in process at every section, the time used when temperature of charge measured value reaches the temperature of charge threshold values of place section is this section of duration, then enters next section and to heat process;
D, maintain 20 ~ 150 minutes when most back segment temperature of charge measured value reaches material maximum permissible temperature, terminate dry run;
E, identical material are undertaken adding temperature control can carry out vacuum freeze drying to this kind of food by above-mentioned heating-up temperature, segmented mode, each section of durations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310640102.5A CN103727746B (en) | 2013-12-04 | 2013-12-04 | The temperature-controlled process of food vacuum freeze drying equipment heating process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310640102.5A CN103727746B (en) | 2013-12-04 | 2013-12-04 | The temperature-controlled process of food vacuum freeze drying equipment heating process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103727746A CN103727746A (en) | 2014-04-16 |
| CN103727746B true CN103727746B (en) | 2015-09-23 |
Family
ID=50451930
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310640102.5A Active CN103727746B (en) | 2013-12-04 | 2013-12-04 | The temperature-controlled process of food vacuum freeze drying equipment heating process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103727746B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114655630B (en) * | 2022-01-26 | 2024-04-30 | 郑州市碧亮真空设备有限公司 | Closed-loop production line for continuously producing and processing freeze-dried products |
| CN114967783B (en) * | 2022-07-01 | 2023-07-07 | 福建利众诚食品有限公司 | Cooling regulation and control method and device based on multi-stage freeze-dried food |
| CN117367043B (en) * | 2023-12-07 | 2024-04-02 | 欣诺泰克(江苏)智造科技有限公司 | Vacuum freeze drier |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1903291A1 (en) * | 2006-09-19 | 2008-03-26 | Ima-Telstar S.L. | Method and system for controlling a freeze drying process |
| WO2011034892A2 (en) * | 2009-09-15 | 2011-03-24 | The Trustees Of Columbia University In The City Of New York | Systems, methods, and devices for microbubbles |
| CN101703196B (en) * | 2009-11-06 | 2011-11-16 | 江南大学 | Segmentation method for improving uniform expansion effect of granular fruits and vegetables during microwave spouted drying |
-
2013
- 2013-12-04 CN CN201310640102.5A patent/CN103727746B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN103727746A (en) | 2014-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103727746B (en) | The temperature-controlled process of food vacuum freeze drying equipment heating process | |
| CN102511542A (en) | Microwave vacuum stage drying method for high moisture vegetables and fruits | |
| CN106839751B (en) | A kind of microwave drying control system based on dielectric property dynamic change | |
| CN104664374B (en) | Gardenia fruit baking equipment and baking technology | |
| CN105783427A (en) | Microwave vacuum drying method achieving staging control | |
| CN206478958U (en) | A kind of heated-air drying equipment | |
| CN102986838A (en) | Intermediate wave infrared and radio frequency combined drying method suitable for dehydration of large-scale seasoning edible mushrooms | |
| CN108497526A (en) | For normal pressure ultrasonic atomizatio-spouted drying device of low frequency microwave pulse of conditioning fruit-vegetable and its application | |
| CN107782124A (en) | A kind of hot wind and microwave dries conjuncted method | |
| CN206803604U (en) | A kind of freeze drying plant for making collagen | |
| CN103392795B (en) | Drying device and drying method | |
| TW201826943A (en) | Simultaneous rapidly drying and parboiling of wet paddy rice by radio-frequency hot air drying | |
| RU2546182C1 (en) | Method and device for drying topinambur | |
| CN105937833A (en) | Freeze drying process of cordyceps sinensis | |
| CN113623973A (en) | Automatic wet vibrating many function combination drying device of accuse control by temperature change | |
| CN105192618B (en) | A kind of tempering drying process of Chinese yam slices | |
| CN102626135A (en) | Vacuum microwave vibration drying method with low energy consumption and low percent cracked rice for granular food-borne material | |
| CN110613153A (en) | Production system of organic dry fruit matrimony vine | |
| CN214065626U (en) | Vegetable baking machine capable of baking uniformly | |
| CN104222894B (en) | A kind of method utilizing the spouted dry efficient uniform dehydrating and conditioning Radix Dauci Sativae of the height microwave combined pulse of frequency | |
| KR101806344B1 (en) | Method for vacuum freeze drying of polyglutamic acid | |
| CN202050872U (en) | Device for segmental temperature control under low temperature, quick-cooling and red skin elimination for peanuts | |
| RU2369284C1 (en) | Method of continuous drying of food products using convective and microwave energy supply | |
| Kozak et al. | Optimization of energy consumption in the freeze drying process of champignon (Agaricus bisporus L) | |
| CN103385279A (en) | Drying method for meat product |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address | ||
| CP03 | Change of name, title or address |
Address after: No. 888, Southwest Road, Shahekou District, Dalian City, Liaoning Province Co-patentee after: ALLIANCE FREEZE DRY Ltd. Patentee after: Iceberg cold and hot technology Co., Ltd Address before: 116000 No. 888, Southwest Road, Shahekou District, Liaoning, Dalian Co-patentee before: ALLIANCE FREEZE DRY Ltd. Patentee before: DALIAN REFRIGERATION Co.,Ltd. |