CN105918770A - Energy-saving control method for jet enthalpy gain heat pump vacuum freeze drying unit equipment with economizer - Google Patents
Energy-saving control method for jet enthalpy gain heat pump vacuum freeze drying unit equipment with economizer Download PDFInfo
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- CN105918770A CN105918770A CN201610299896.7A CN201610299896A CN105918770A CN 105918770 A CN105918770 A CN 105918770A CN 201610299896 A CN201610299896 A CN 201610299896A CN 105918770 A CN105918770 A CN 105918770A
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L3/00—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs
- A23L3/40—Preservation of foods or foodstuffs, in general, e.g. pasteurising, sterilising, specially adapted for foods or foodstuffs by drying or kilning; Subsequent reconstitution
- A23L3/44—Freeze-drying
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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
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Abstract
The invention relates to an energy-saving control method for jet enthalpy gain heat pump vacuum freeze drying unit equipment with an economizer. The energy-saving control method for a control system is characterized by comprising the following steps of according to requirements of a food drying process, determining the temperature T1 of heating mediums entering an inlet of a heating partition board of a drying chamber; according to vacuum requirements of the unit equipment and the changes of the thickness of a surface frost layer of a water catcher in the operation process of the unit equipment, determining a functional expression of changes of evaporating temperature T3 of the water catcher in the running process of the unit equipment along with running time t; according to the functional expression of the changes of the evaporating temperature T3 of the water catcher along with the running time t, realizing energy-saving control through the opening degree of a main throttle valve, and speed adjustment of a jet enthalpy gain frequency conversion compressor; according to the evaporating temperature T3 of the water catcher and condensing temperature T2 of a condenser, obtaining the best opening degree of an auxiliary throttle valve corresponding to the main throttle valve under different opening degrees through experiment or theoretical arithmetic, and adjusting the opening degree of the auxiliary throttle valve, so that a refrigerating system is in the best energy efficiency ratio of the refrigerating system. The energy-saving control method disclosed by the invention has the advantages that the evaporating temperature of the water catcher can be dynamically adjusted according to the changes of the frosting thickness of the water catcher, energy-saving running of the jet enthalpy gain refrigerating system with the economizer is realized, and the refrigerating system runs in the energy-saving manner.
Description
Technical field
The present invention relates to a kind of band economizer air injection enthalpy-increasing heat pump vacuum lyophilization unit equipment energy-saving control method.
Background technology
The food that vacuum freeze is dried is good relative to the food quality that other drying meanss are dried, but the course of processing
Middle energy consumption is big.During vacuum freeze runs, the water sublimed being on the one hand dried in food needs substantial amounts of heat, separately
On the one hand, moisture is sublimated in water vessel needs substantial amounts of cold.Owing to providing the refrigeration of cold for vacuum freeze
System is during refrigeration, and substantial amounts of heat released by its condenser, and this heat is more than food drying institute calorific requirement, because of
This, have researcher to propose to utilize refrigerant system condenser heat as food drying thermal source, so occur in that heat pump vacuum freezing
It is dried unit equipment.Unit equipment energy consumption in running is mainly refrigeration system energy consumption, the joint of unit equipment to be realized
Can, it is important under meeting the requirements such as food processing technology parameter such as hothouse heating-up temperature, vacuum, improve refrigeration as far as possible
The evaporating temperature of system.Due within a dry process-cycle food drying technique be change, its required refrigerating capacity and
Evaporating temperature is change, and institute's calorific requirement and heating-up temperature are also changes, and it is energy-conservation how Collaborative Control becomes unit equipment
Crucial.Simultaneously as hothouse heating needed for temperature typically at about 60 DEG C, refrigeration system evaporating temperature at about-40 DEG C,
Refrigeration system must use cascade refrigeration, two-stage compression refrigeration or air injection enthalpy-increasing refrigeration could meet requirement, but this also increases
The control difficulty of unit equipment.
Summary of the invention
It is an object of the invention to overcome the deficiencies in the prior art to provide a kind of band economizer air injection enthalpy-increasing heat pump vacuum cold
Lyophilizing dry unit equipment energy-saving control method, in a complete dry process-cycle, the evaporating temperature of water vessel can root
Dynamically adjust according to the change of water vessel surface frosting thickness, it is achieved that the energy saving in running of air injection enthalpy-increasing refrigeration system so that band economy
Device air injection enthalpy-increasing heat pump vacuum lyophilization unit equipment runs more energy-conservation.
In order to achieve the above object, the present invention is achieved in that it is a kind of band economizer air injection enthalpy-increasing heat pump vacuum
Lyophilization unit equipment energy-saving control method, it is characterised in that unit equipment includes vacuum system, air injection enthalpy-increasing frequency conversion compression
Machine, cooling water flow regulation valve, bypass heat exchanger, heating medium circulation pump, condenser, hothouse heated barrier, economizer, auxiliary
Help choke valve, primary throttle valve, water vessel, control system, heating medium inlet temperature sensor, condensation temperature sensor and catch water
Device evaporating temperature sensor；Wherein said heating medium inlet temperature sensor senses enters adding of hothouse heated barrier entrance
Temperature T1 of thermal medium, condensation temperature sensor sensing flows out condensation temperature T2 of the cold-producing medium of condenser, water vessel evaporation temperature
Degree sensor sensing enters evaporating temperature T3 of the cold-producing medium of water vessel, and described control system energy-saving control method includes that step is such as
Under:
(1) temperature T1 adding thermal medium of entrance hothouse heated barrier entrance is determined according to food drying technological requirement, with this
Realized by the aperture of regulation cooling water flow regulation valve for control object, when actual temperature is more than setting value, cool down water
The aperture of flow control valve strengthens, otherwise reduces；
(2) according to the change of water vessel surface frost thickness in unit equipment vacuum level requirements and unit equipment running,
Determine that in unit equipment running, evaporating temperature T3 of water vessel is with running the functional expression that time t changes, the following is a kind of letter
The computational methods changed:
A (), according to the vacuum of the hothouse determined, obtains the corresponding steam de-sublimation temperature of water vessel, namely water vessel frost layer
The evaporating temperature on surface have to be lower than this temperature, the highest initial evaporation of water vessel when this temperature namely unit equipment bring into operation
Temperature T31；
B () always catches the water yield and surface area according to water vessel, frosting thickness in water vessel surface when determining whole service end cycle
D, obtains end evaporating temperature T32 of required water vessel at the end of cycle of operation, therefore catches water in the S time in whole service cycle
The initial vaporization temperature T31 of device and the poor Δ T=T31-T32 terminating evaporating temperature T32；
C () because of in the S time in whole service cycle, the unit interval distillation water yield is different, according to actual motion rule, and its running
Substantially can be divided into two stages, the first stage is 0～0.5S within the operation time of half, and the distillation water yield is about total Water
70% ± 10%, and unit interval distillation amount is essentially identical；Within the second stage remaining operation time namely 0.5S～S, distillation
The water yield is about the 30% ± 10% of total Water, and unit interval distillation amount is the most essentially identical；As calculated with plate water vessel, then
Evaporating temperature T3 of first stage water vessel (11) is T3=T31-1.4*(t/s with the function formula I of operation time t change) * Δ
T, in formula I,, the function formula II changed at the evaporating temperature T3 t in time of second stage water vessel is T3=T31-
0.4 Δ T-0.6*(t/s) * Δ T, in formula II,, it is contemplated that to the certain safe clearance of evaporating temperature, actual evaporation temperature
Degree T4 can reduce by 2～3 DEG C on the basis of above-mentioned value of calculation；
(3) the function formula I changed with operation time t according to evaporating temperature T3 of water vessel and function formula II, pass through primary throttle valve
Aperture regulation and the rotational speed regulation of air injection enthalpy-increasing frequency-changeable compressor realize；When the actual value of evaporating temperature T3 of water vessel is high
When value of calculation, the rotating speed of air injection enthalpy-increasing frequency-changeable compressor improves, and the aperture of primary throttle valve reduces accordingly, when actual value is less than meter
During calculation value, the rotating speed increasing enthalpy frequency-changeable compressor (2) reduces, and the aperture of primary throttle valve strengthens accordingly；
(4) according to evaporating temperature T3 and condensation temperature T2 of condenser of water vessel, main joint is obtained by experiment or Theoretical Calculation
The optimal aperture of the auxiliary throttle valve that stream valve is corresponding under different apertures, the aperture of regulation auxiliary throttle valve, make refrigeration system
It is in optimal Energy Efficiency Ratio state.
The present invention compared with prior art, has the advantage that
Heat pump vacuum lyophilization unit equipment is in a complete dry process-cycle, and water vessel evaporating temperature can basis
The change of water vessel surface frosting thickness dynamically adjusts, it is achieved that the energy saving in running of band economizer air injection enthalpy-increasing refrigeration system so that
Band economizer air injection enthalpy-increasing heat pump vacuum lyophilization unit equipment runs more energy-conservation.
Accompanying drawing explanation
Fig. 1 is the band economizer air injection enthalpy-increasing heat pump vacuum lyophilization combined equipment system schematic diagram that the present invention implements.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings.Below with reference to
The embodiment that accompanying drawing describes is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
As it is shown in figure 1, it is a kind of band economizer air injection enthalpy-increasing heat pump vacuum lyophilization unit equipment Energy Saving Control side
Method, unit equipment includes vacuum system 1, air injection enthalpy-increasing frequency-changeable compressor 2, cooling water flow regulation valve 3, bypass heat exchanger 4, adds
Thermal medium circulating pump 5, condenser 6, hothouse heated barrier 7, economizer 8, auxiliary throttle valve 9, primary throttle valve 10, water vessel
11, control system 12, heating medium inlet temperature sensor 13, condensation temperature sensor 14 and water vessel evaporating temperature sensor
15；Wherein
The refrigerant outlet of described air injection enthalpy-increasing frequency-changeable compressor 2 connects with the refrigerant inlet of bypass heat exchanger 4, described bypass
The refrigerant outlet of heat exchanger 4 connects with the refrigerant inlet of condenser 6, the refrigerant outlet of described condenser 6 and economizer 8
Two refrigerant inlets connection, described auxiliary throttle valve 9 is located on the pipe that a condenser 6 connects with economizer 8, described economy
In the middle of one cold-producing medium of one refrigerant outlet of device 8 and air injection enthalpy-increasing frequency-changeable compressor 2, gas returning port connects, another of economizer 8
Refrigerant outlet is connected with the refrigerant inlet of water vessel 11 by primary throttle valve 10, the refrigerant outlet of water vessel 11 and jet
Increase the cold-producing medium main gas returning port connection of enthalpy frequency-changeable compressor 2；Described heating medium circulation pump 5 is connected with hothouse heated barrier 7,
Condenser 6 is to adding thermal medium heating, and the thermal medium that adds after being heated is flowed in hothouse heated barrier 7 to enter hothouse material
Row heating；The temperature of described cooling water flow regulation valve 3 scalable bypass heat exchanger 4, hothouse is carried out by described vacuum system 1
Evacuation, water vessel 11 traps the moisture content from hothouse；
Described heating medium inlet temperature sensor 13 senses the inlet temperature of circulating-heating medium, namely enters hothouse heating
Temperature T1 adding thermal medium of dividing plate 7 entrance, the condensation temperature of the cold-producing medium of condenser 6 is flowed out in condensation temperature sensor 14 sensing
T2, water vessel evaporating temperature sensor 15 sensing enters evaporating temperature T3 of the cold-producing medium of water vessel 11, described control system 12
Energy-saving control method comprise the following steps that
(1) temperature T1 adding thermal medium of entrance hothouse heated barrier 7 entrance is determined according to food drying technological requirement, with
This is realized by the aperture of regulation cooling water flow regulation valve 3 for control object, when actual temperature is more than setting value, and cooling
The aperture of Water flow adjusting valve 3 strengthens, otherwise reduces；
(2) according to the change of water vessel 11 surface frost thickness in unit equipment vacuum level requirements and unit equipment running
Change, determine that in unit equipment running, evaporating temperature T3 of water vessel 11, with running the functional expression that time t changes, the following is one
The computational methods that kind simplifies:
A (), according to determining the vacuum of hothouse, obtains the corresponding steam de-sublimation temperature of water vessel 11, namely water vessel 11 frost
Layer surface evaporating temperature T3 have to be lower than this temperature, when this temperature namely unit equipment bring into operation water vessel 11 the highest at the beginning of
Beginning evaporating temperature T31；
B () always catches the water yield and surface area according to water vessel 11, water vessel 11 surface frosting when determining whole service end cycle
Thickness d, obtains end evaporating temperature T32 of required water vessel 11 at the end of cycle of operation, therefore S time in whole service cycle
The initial vaporization temperature T31 of interior water vessel (11) and the poor Δ T=T31-T32 terminating evaporating temperature T32；
C () because of in the S time in whole service cycle, the unit interval distillation water yield is different, according to actual motion rule, and its running
Substantially can be divided into two stages, the first stage is 0～0.5S within the operation time of half, and the distillation water yield is about total Water
70% ± 10%, and unit interval distillation amount is essentially identical；Within the second stage remaining operation time namely 0.5S～S, distillation
The water yield is about the 30% ± 10% of total Water, and unit interval distillation amount is the most essentially identical；As calculated with plate water vessel, then
Evaporating temperature T3 of first stage water vessel (11) is T3=T31-1.4*(t/s with the function formula I of operation time t change) * Δ
T, in formula I,, the function formula II changed at the evaporating temperature T3 t in time of second stage water vessel 11 is T3=
T31-0.4 Δ T-0.6*(t/s) * Δ T, in formula II,；In view of to the certain safe clearance of evaporating temperature, reality is steamed
Send out temperature T4 and can reduce by 2～3 DEG C on the basis of above-mentioned value of calculation；
(3) the function formula I changed with operation time t according to evaporating temperature T3 of water vessel 11 and function formula II, by main throttling
The aperture regulation of valve 10 and the rotational speed regulation of air injection enthalpy-increasing frequency-changeable compressor 2 realize.Reality when evaporating temperature T3 of water vessel 1
When actual value is higher than value of calculation, the rotating speed of air injection enthalpy-increasing frequency-changeable compressor 2 improves, and the aperture of primary throttle valve 10 reduces accordingly, works as reality
When actual value is less than value of calculation, the rotating speed increasing enthalpy frequency-changeable compressor 2 reduces, and the aperture of primary throttle valve 10 strengthens accordingly；
(4) according to evaporating temperature T3 and condensation temperature T2 of condenser 6 of water vessel 11, obtained by experiment or Theoretical Calculation
The optimal aperture of auxiliary throttle valve 9 corresponding under the aperture of different primary throttle valves 10, the aperture of regulation auxiliary throttle valve 9, make
Refrigeration system is in optimal Energy Efficiency Ratio state.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that: not
These embodiments can be carried out multiple change in the case of the principle of the disengaging present invention and objective, revise, replace and deform, this
The scope of invention is limited by claim and equivalent thereof.
Claims (1)
1. a band economizer air injection enthalpy-increasing heat pump vacuum lyophilization unit equipment energy-saving control method, it is characterised in that combination
Equipment include vacuum system (1), air injection enthalpy-increasing frequency-changeable compressor (2), cooling water flow regulation valve (3), bypass heat exchanger (4),
Heating medium circulation pump (5), condenser (6), hothouse heated barrier (7), economizer (8), auxiliary throttle valve (9), main throttling
Valve (10), water vessel (11), control system (12), heating medium inlet temperature sensor (13), condensation temperature sensor (14)
And water vessel evaporating temperature sensor (15)；The sensing of wherein said heating medium inlet temperature sensor (13) enters hothouse and adds
Temperature T1 adding thermal medium of hot dividing plate (7) entrance, the cold-producing medium of condenser (6) is flowed out in condensation temperature sensor (14) sensing
Condensation temperature T2, water vessel evaporating temperature sensor (15) sensing enters evaporating temperature T3 of the cold-producing medium of water vessel (11), institute
State control system (12) energy-saving control method to comprise the following steps that
(1) temperature T1 adding thermal medium of entrance hothouse heated barrier (7) entrance is determined according to food drying technological requirement,
Realized by the aperture of regulation cooling water flow regulation valve (3) as control object, when actual temperature is more than setting value,
The aperture of cooling water flow regulation valve (3) strengthens, otherwise reduces；
(2) according to water vessel (11) surface frost thickness in unit equipment vacuum level requirements and unit equipment running
Change, determines that in unit equipment running, evaporating temperature T3 of water vessel (11) is with running the functional expression that time t changes, below
It is the computational methods of a kind of simplification:
A (), according to determining the vacuum of hothouse, obtains the corresponding steam de-sublimation temperature of water vessel (11), namely water vessel
(11) evaporating temperature T3 on frost layer surface have to be lower than this temperature, water vessel (11) when this temperature namely unit equipment bring into operation
The highest initial vaporization temperature T31；
B () always catches the water yield and surface area according to water vessel (11), water vessel (11) surface when determining whole service end cycle
Frosting thickness d, obtains end evaporating temperature T32 of required water vessel (11) at the end of cycle of operation, therefore whole service week
The initial vaporization temperature T31 of water vessel (11) and temperature difference T=T31-T32 terminating evaporating temperature T32 in time phase S；
C () because of in the S time in whole service cycle, the unit interval distillation water yield is different, according to actual motion rule, and its running
Substantially can be divided into two stages, the first stage is 0～0.5S within the operation time of half, and the distillation water yield is about total Water
70% ± 10%, and unit interval distillation amount is essentially identical；Within the second stage remaining operation time namely 0.5S～S, distillation
The water yield is about the 30% ± 10% of total Water, and unit interval distillation amount is the most essentially identical；As calculated with plate water vessel, then
Evaporating temperature T3 of first stage water vessel (11) is T3=T31-1.4*(t/s with the function formula I of operation time t change) * Δ
T, in formula I,, the function formula II changed at the evaporating temperature T3 t in time of second stage water vessel (11) is T3=
T31-0.4 Δ T-0.6*(t/s) * Δ T, in formula II,, it is contemplated that to the certain safe clearance of evaporating temperature, actual steaming
Send out temperature T4 and can reduce by 2～3 DEG C on the basis of above-mentioned value of calculation；
(3) the function formula I changed with operation time t according to evaporating temperature T3 of water vessel (11) and function formula II, by main joint
The aperture regulation of stream valve (10) and the rotational speed regulation of air injection enthalpy-increasing frequency-changeable compressor (2) realize；Evaporation when water vessel (11)
When the actual value of temperature T3 is higher than value of calculation, the rotating speed of air injection enthalpy-increasing frequency-changeable compressor (2) improves, the aperture of primary throttle valve (10)
Corresponding reduction, when actual value is less than value of calculation, the rotating speed increasing enthalpy frequency-changeable compressor (2) reduces, the aperture of primary throttle valve (10)
Corresponding increasing；
(4) according to evaporating temperature T3 and condensation temperature T2 of condenser (6) of water vessel (11), by experiment or Theoretical Calculation
Obtain the optimal aperture of primary throttle valve (10) auxiliary throttle valve (9) corresponding under different apertures, regulation auxiliary throttle valve (9)
Aperture, make refrigeration system be in optimal Energy Efficiency Ratio state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610299896.7A CN105918770B (en) | 2016-05-09 | 2016-05-09 | energy-saving control method for enhanced vapor injection heat pump vacuum freeze drying combined equipment with economizer |
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| CN201610299896.7A CN105918770B (en) | 2016-05-09 | 2016-05-09 | energy-saving control method for enhanced vapor injection heat pump vacuum freeze drying combined equipment with economizer |
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| CN105918770A true CN105918770A (en) | 2016-09-07 |
| CN105918770B CN105918770B (en) | 2019-12-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109442889A (en) * | 2018-10-10 | 2019-03-08 | 浙江大学 | One mode changeable waste heat recovery type heat pump drying device and its operation method |
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| CN109442889B (en) * | 2018-10-10 | 2019-10-01 | 浙江大学 | One mode changeable waste heat recovery type heat pump drying device and its operation method |
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| Publication number | Publication date |
|---|---|
| CN105918770B (en) | 2019-12-13 |
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