CN111418690A - Coffee stock solution concentrating device and production method of flash-dissolved reduced coffee - Google Patents
Coffee stock solution concentrating device and production method of flash-dissolved reduced coffee Download PDFInfo
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- CN111418690A CN111418690A CN202010424385.XA CN202010424385A CN111418690A CN 111418690 A CN111418690 A CN 111418690A CN 202010424385 A CN202010424385 A CN 202010424385A CN 111418690 A CN111418690 A CN 111418690A
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- 235000013353 coffee beverage Nutrition 0.000 title claims abstract description 191
- 235000016213 coffee Nutrition 0.000 title claims abstract description 190
- 239000011550 stock solution Substances 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000007710 freezing Methods 0.000 claims abstract description 91
- 230000008014 freezing Effects 0.000 claims abstract description 91
- 239000007788 liquid Substances 0.000 claims abstract description 85
- 239000000463 material Substances 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 38
- 239000000843 powder Substances 0.000 claims description 34
- 239000000243 solution Substances 0.000 claims description 31
- 238000000034 method Methods 0.000 claims description 17
- 239000002002 slurry Substances 0.000 claims description 15
- 238000004108 freeze drying Methods 0.000 claims description 14
- 241000533293 Sesbania emerus Species 0.000 claims description 13
- 238000000926 separation method Methods 0.000 claims description 10
- 238000003860 storage Methods 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 7
- 238000000605 extraction Methods 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 229910001385 heavy metal Inorganic materials 0.000 claims description 5
- 229920002521 macromolecule Polymers 0.000 claims description 5
- 239000000447 pesticide residue Substances 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 4
- 238000009413 insulation Methods 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 239000012141 concentrate Substances 0.000 claims 9
- 235000021539 instant coffee Nutrition 0.000 description 8
- 239000000796 flavoring agent Substances 0.000 description 6
- 235000019634 flavors Nutrition 0.000 description 6
- 239000000306 component Substances 0.000 description 4
- 230000035622 drinking Effects 0.000 description 3
- 238000000703 high-speed centrifugation Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000002120 nanofilm Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000013124 brewing process Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003205 fragrance Substances 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 235000013647 Prunus pensylvanica Nutrition 0.000 description 1
- 240000007942 Prunus pensylvanica Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000005374 membrane filtration Methods 0.000 description 1
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- 238000011946 reduction process Methods 0.000 description 1
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- 238000001694 spray drying Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
- 238000003809 water extraction Methods 0.000 description 1
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
- A23F5/28—Drying or concentrating coffee extract
- A23F5/30—Drying or concentrating coffee extract by freezing out the water
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/16—Removing unwanted substances
- A23F5/18—Removing unwanted substances from coffee extract
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
- A23F5/26—Extraction of water-soluble constituents
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23F—COFFEE; TEA; THEIR SUBSTITUTES; MANUFACTURE, PREPARATION, OR INFUSION THEREOF
- A23F5/00—Coffee; Coffee substitutes; Preparations thereof
- A23F5/24—Extraction of coffee; Coffee extracts; Making instant coffee
- A23F5/28—Drying or concentrating coffee extract
- A23F5/32—Drying or concentrating coffee extract by lyophilisation
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- Life Sciences & Earth Sciences (AREA)
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- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
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Abstract
The invention relates to a coffee stock solution concentrating device and a production method of flash-dissolving reduced coffee, wherein the device comprises a freezing chamber, a freezing tank is arranged in the freezing chamber, the freezing tank is communicated with a steam conveying pipe and a coffee stock solution conveying pipe, a temperature sensor and a liquid level sensor are arranged in the freezing tank, the lower end of the freezing tank extends out of the freezing chamber, the bottom end of the freezing tank is communicated with a liquid outlet funnel, a material receiving container is arranged at the lower end of the liquid outlet funnel, the temperature sensor and the liquid level sensor are connected with a P L C controller, and the refrigerating device is communicated with the freezing chamber.
Description
Technical Field
The invention relates to a concentrating device, in particular to a coffee stock solution concentrating device for keeping the original taste of coffee, and also relates to a production method of flash-dissolved reduced coffee, belonging to the field of coffee solid beverage processing.
Background
Coffee is commonly sold as both roast and ground coffee and instant coffee.
The traditional coffee brewing method is to brew roasted coffee beans by using a percolator after grinding on site, wherein the coffee beans are filtered by filter materials such as filter paper (filter cloth) and the like in the brewing process, and residues are filtered, so that the freshly ground coffee with good taste and flavor is obtained.
The instant coffee is prepared by making coffee into dry powder by using brewed coffee liquid through a spray drying method or a conventional low-temperature drying method, and the instant coffee which is ready to drink is obtained.
The traditional freshly ground coffee has the inconvenient factors of time-consuming brewing process, requirement of specific instruments and the like; instant coffee suffers from a permanent loss of substantial flavor during drying and is of inferior quality compared to freshly ground coffee.
The freeze-dried flash-dissolved coffee reduced powder not only maintains the taste and flavor of freshly ground coffee, but also has the characteristic of convenient drinking of instant coffee, and becomes a new and expensive coffee family.
In order to obtain the flash-dissolved coffee which not only maintains the taste and flavor of the freshly ground coffee, but also has the characteristic of convenient drinking of instant coffee, the flash-dissolved reduced coffee powder is obtained by adopting a freeze drying method.
Before freeze drying, coffee powder is soaked and extracted to obtain primary coffee pulp on the premise of keeping the original taste and effective components of coffee as much as possible.
And (3) carrying out solid-liquid separation on the primary coffee pulp to obtain the coffee stock solution with lower concentration without coffee grounds. In order to increase the efficiency of the ultrafiltration and lyophilization, the concentration of the coffee base must be increased.
Disclosure of Invention
In order to solve the above problems, the present invention provides an apparatus and method for concentrating a coffee raw liquid. The technical scheme of the invention is as follows:
the utility model provides a coffee stoste enrichment facility, includes the freezer, is equipped with freezing jar in the freezer, freezing jar and steam conveying pipe and coffee stoste conveyer pipe intercommunication, is equipped with temperature sensor and level sensor in the freezing jar, and freezing jar lower extreme stretches out the freezer, and freezing tank bottoms end and play liquid funnel intercommunication connect the material container to locate out the liquid funnel lower extreme, and temperature sensor and level sensor are connected with P L C controller, refrigerating plant and freezer intercommunication.
Furthermore, a bracket is arranged below the freezing chamber, one end of the coffee stock solution conveying pipe is communicated with the liquid storage tank, and the liquid storage tank is arranged beside the bracket.
Furthermore, a pipeline pump is arranged on the coffee original liquid conveying pipe, a first electromagnetic valve is arranged on the coffee original liquid conveying pipe between the pipeline pump and the liquid storage tank, a second electromagnetic valve and a third electromagnetic valve are respectively arranged on the coffee original liquid conveying pipe and the steam conveying pipe at the inlet of the freezing tank, a fourth electromagnetic valve is arranged on a pipeline at the lower end of the liquid outlet funnel, and the pipeline pump and the electromagnetic valves are controlled by a P L C controller.
Furthermore, three temperature sensors are arranged on the freezing tank at different heights, and a liquid outlet funnel is also provided with a temperature sensor.
Furthermore, one end of the liquid outlet funnel is hinged with the bottom end of the freezing tank.
Furthermore, the inner wall of the freezing chamber is provided with a heat insulation layer.
The invention also relates to a method for concentrating the coffee stock solution before freeze drying, which is carried out as follows:
after the coffee stock solution to be concentrated is injected into the freezing tank, the temperature of the freezing chamber is reduced to-5 ℃ to 30 ℃, the temperature in the freezing tank is synchronously reduced, so that water in the coffee stock solution is frozen and floats on the upper part of the liquid level when the temperature of the freezing tank is reduced to the freezing point, the water in the coffee stock solution is continuously separated out in the heat preservation process, floats on the upper layer of the solution after being frozen, and the lower layer of the solution is taken out after a period of time, thus obtaining the concentrated coffee stock solution with a large amount of water removed.
The invention also relates to a production method of the flash-dissolved reduced coffee, which comprises the following steps:
roasting and grinding green coffee beans to obtain ground coffee powder;
step (2), extracting the ground coffee powder with cold water to obtain coffee slurry;
step (3), performing solid-liquid separation on the coffee slurry to obtain coffee grounds and low-concentration coffee stock solution;
concentrating the obtained coffee stock solution to obtain concentrated coffee solution;
screening the concentrated coffee stock solution through a molecular membrane to remove macromolecular substances, heavy metals and pesticide residues;
and (6) freeze-drying the concentrated coffee liquid, and controlling the temperature to be below 0 ℃ to obtain the flash-dissolved reduced coffee powder.
Further, in the step (4), the low-concentration coffee raw liquid is concentrated by the above-mentioned device according to the above-mentioned method to obtain the high-concentration concentrated coffee liquid.
Further, in the step (2), the ground coffee powder and cold water are mixed at normal temperature according to the ratio of 1: 1-4, extracting in an extraction tower to obtain coffee slurry; in the step (4), the soluble solid content of the concentrated coffee liquid reaches more than 10 percent.
Compared with the prior art, the invention has the following beneficial effects:
(1) after the coffee stock solution is concentrated before freeze drying by adopting the freeze concentration device, the finally obtained flash-dissolved reduced coffee powder has high reduction degree, rich fragrance and clear liquor color, fully retains the original components, fragrance and flavor of coffee, and perfectly reduces the original flavor of freshly ground coffee.
(2) The device has ingenious structural design, and based on the fact that the freezing point of water in the coffee solution is higher than that of the soluble coffee substance solution, when the temperature of the freezing tank is reduced to the freezing point, the water in the solution is firstly frozen and floats on the upper part of the liquid level, the process is circulated at a certain constant temperature, the water in the solution is continuously separated out and floats on the upper layer of the solution after being frozen, and at the moment, the lower layer of the solution is taken out, so that the concentrated coffee stock solution with a large amount of water removed is obtained. Furthermore, the funnel at the bottom of the freezing tank of the device is arranged outside the freezing chamber, and the funnel is movably connected with the freezing chamber, so that the lower-layer solution can be conveniently taken out.
(3) According to the method provided by the invention, cold water extraction is carried out at normal temperature instead of high-temperature extraction to obtain raw coffee pulp, the raw coffee liquid with lower concentration is obtained through solid-liquid separation, low-temperature freezing concentration is carried out through a self-developed device to obtain the raw coffee liquid with the soluble solid content of more than 10%, and the raw coffee liquid is further purified through molecular membrane filtration and then is freeze-dried to obtain the flash-dissolved coffee powder. The flash-dissolved reduced coffee powder obtained by the method effectively retains the aroma and the taste of coffee, and can achieve the quality of freshly roasted and ground brewed coffee.
(4) The flash-dissolving reduced coffee powder prepared by the method has the same sensory quality as freshly ground brewed coffee, has no change in quality after being stored for 24 months, and is suitable for instant brewing and drinking and also very suitable for preparing high-quality coffee beverages.
Drawings
FIG. 1 is a schematic diagram of the structure of the device of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Unless otherwise defined, technical or scientific terms used in the embodiments of the present application should have the ordinary meaning as understood by those having ordinary skill in the art to which the present invention belongs. The use of "first," "second," and similar language in the embodiments of the present invention does not denote any order, quantity, or importance, but rather the terms "first," "second," and similar language are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. "mounted," "connected," and "coupled" are to be construed broadly and may, for example, be fixedly coupled, detachably coupled, or integrally coupled; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "Upper," "lower," "left," "right," "lateral," "vertical," and the like are used solely in relation to the orientation of the components in the figures, and these directional terms are relative terms that are used for descriptive and clarity purposes and that can vary accordingly depending on the orientation in which the components in the figures are placed.
Example 1
As shown in fig. 1, the coffee raw liquid concentrating device of the present embodiment includes a freezing chamber 10, a freezing tank 6 is disposed in the freezing chamber 10, the freezing tank 6 is communicated with a steam delivery pipe 9 and a coffee raw liquid delivery pipe 3, a temperature sensor and a liquid level sensor are disposed in the freezing tank 6, three temperature sensors 11 are disposed on the freezing tank at different heights, and a liquid outlet funnel 13 is also provided with the temperature sensor 11.
The lower end of the freezing tank 6 extends out of the freezing chamber 10, the bottom end of the freezing tank 6 is communicated with the liquid outlet funnel 13, the material receiving container 16 is arranged at the lower end of the liquid outlet funnel 13, the temperature sensor 11 and the liquid level sensor 15 are connected with the P L C controller 17, and the refrigerating device 18 is communicated with the freezing chamber 10.
A support 19 is arranged below the freezing chamber 10, one end of a coffee original liquid conveying pipe 3 is communicated with a liquid storage tank 1, the liquid storage tank 1 is arranged beside the support 19, a pipeline pump 5 is arranged on the coffee original liquid conveying pipe 3, a first electromagnetic valve 4 is arranged on the coffee original liquid conveying pipe 3 between the pipeline pump 5 and the liquid storage tank 1, a second electromagnetic valve 7 and a third electromagnetic valve 8 are respectively arranged on the coffee original liquid conveying pipe 3 and a steam conveying pipe 9 at the inlet of the freezing tank 6, a fourth electromagnetic valve 14 is arranged on a pipeline at the lower end of the liquid outlet funnel 13, and the pipeline pump 5 and the electromagnetic valves are controlled by a P L.
As shown in fig. 1, one end of the liquid outlet funnel 13 is hinged with the bottom end of the freezing cylinder 6. The inner wall of the freezing chamber 10 is provided with a heat insulation layer.
After the liquid to be concentrated is injected into the freezing tank, the temperature in the freezing tank is synchronously reduced by reducing the temperature of the freezing chamber, and as the freezing point of the water in the coffee solution is higher than that of the coffee solution, the water in the solution is frozen and floats on the upper part of the liquid level when the temperature of the freezing tank is reduced to the freezing point, the process is circulated at a certain constant temperature, so that the water in the solution is continuously separated out and floats on the upper layer of the solution after being frozen, and at the moment, the lower layer of solution is taken out, namely the concentrated coffee stock solution with a large amount of water removed is obtained.
The size and number of freezing cylinders 6 can be set as desired and matched to the size of the freezing chamber 10.
In the embodiment, a coffee solution 2 to be concentrated is placed in a liquid storage tank 1, a P L C controller 17 controls a first electromagnetic valve 4, a second electromagnetic valve 7 and a pipeline pump 5, a low-concentration liquid is filled into a freezing tank 6 through a coffee stock solution conveying pipe 3, after a liquid level sensor 15 transmits liquid level information to a P L C controller 17, the P L C controller 17 controls the electromagnetic valves 4 and 7 and the pipeline pump 5 to stop filling, the refrigerating device 18 is started to reduce the temperature in a freezing chamber 10 while the electromagnetic valves 4 and 7 are closed, data are transmitted through a temperature sensor 11 in the temperature reduction process and are controlled by a P L C controller 17, when the temperature of the freezing chamber is reduced to a set temperature and is automatically timed by the controller 17 to freeze for a period, the refrigerating device 18 stops working, a fourth electromagnetic valve 14 is opened, the concentrated liquid 12 is discharged to a container 16 and is replaced, at the moment, a liquid outlet funnel 13 of the openable freezing tank is opened, the third electromagnetic valve 8 is opened, high-temperature steam is injected into the freezing tank 6 through a steam conveying pipe 9, the wall of the freezing tank 6 is quickly frozen, the wall of the freezing tank is separated from the ice blocks, and the ice blocks are naturally discharged.
The coffee production method of the embodiment includes the following steps:
roasting and grinding green coffee beans to obtain ground coffee powder;
roasting green coffee beans, and crushing the roasted and moderately roasted Kenya red cherry coffee beans into powder at normal temperature to obtain ground coffee powder.
And (2) extracting the ground coffee powder with cold water to obtain coffee slurry.
Mixing ground coffee powder with water according to a ratio of 1: 1.3 weight ratio to release water soluble material upon contact with water in the extraction column.
Step (3), performing solid-liquid separation on the coffee slurry to obtain coffee grounds and coffee stock solution;
the coffee slurry is separated into coffee grounds and coffee raw liquid by high-speed centrifugation.
And (4) concentrating the screened coffee stock solution to obtain concentrated coffee solution.
And (5) screening the coffee stock solution through a 0.01-micrometer molecular film to remove macromolecular substances, heavy metals and pesticide residues.
The low-concentration coffee base obtained after the solid-liquid separation was freeze-concentrated before freeze-drying by the apparatus of this example to obtain a concentrated coffee base. And (3) reducing the temperature of the freezing chamber to-15 ℃, synchronously reducing the temperature in the freezing tank, leading water in the coffee stock solution to freeze and float on the upper part of the liquid level in the freezing tank, continuously separating out the water in the coffee stock solution, floating on the upper layer of the solution after freezing, and taking out the lower layer of the solution after keeping the temperature for 3 hours, thus obtaining the concentrated coffee stock solution with a large amount of water removed. The soluble solid content of the concentrated coffee liquid reaches 15.8 percent.
And (6) vacuumizing the concentrated coffee liquid at the temperature of-20 ℃, and freeze-drying to obtain the flash-dissolved reduced coffee powder.
Example 2
The coffee raw liquid concentrating apparatus of this example is the same as that of example 1.
The coffee production method of the embodiment includes the following steps:
roasting and grinding green coffee beans to obtain ground coffee powder;
roasting green coffee beans, and crushing the roasted Yunnan small-particle moderate roasted coffee beans into powder at normal temperature to obtain ground coffee powder.
Step (2), extracting the ground coffee powder with cold water to obtain coffee slurry;
mixing ground coffee powder with water according to a ratio of 1: 3.3 weight ratio to release water soluble substances in contact with water in the extraction column.
Step (3), performing solid-liquid separation on the coffee slurry to obtain coffee grounds and coffee stock solution;
the coffee slurry is separated into coffee grounds and coffee raw liquid by high-speed centrifugation.
And (4) screening the coffee stock solution through a 0.01-micrometer molecular film to remove macromolecular substances, heavy metals and pesticide residues.
And (5) concentrating the screened coffee stock solution to obtain concentrated coffee solution.
The low-concentration coffee base obtained after the solid-liquid separation was freeze-concentrated before freeze-drying by the apparatus of this example to obtain a concentrated coffee base. And (3) reducing the temperature of the freezing chamber to-12 ℃, synchronously reducing the temperature in the freezing tank, leading water in the coffee stock solution to freeze and float on the upper part of the liquid level in the freezing tank, continuously separating out the water in the coffee stock solution, floating on the upper layer of the solution after freezing, and taking out the lower layer of the solution after preserving the temperature for 2.8 hours, thus obtaining the concentrated coffee stock solution with a large amount of water removed. The soluble solids content of the concentrated coffee solution reached 16.4%.
And (6) vacuumizing the concentrated coffee liquid at the temperature of-50 ℃, and freeze-drying to obtain the instant coffee powder.
Example 3
The coffee production method of the embodiment includes the following steps:
roasting and grinding green coffee beans to obtain ground coffee powder;
roasting green coffee beans, and crushing the roasted Columbia cadim deep roasted coffee beans into powder at normal temperature to obtain ground coffee powder.
Step (2), extracting the ground coffee powder with cold water to obtain coffee slurry;
mixing ground coffee powder with water according to a ratio of 1: 2.8 weight ratio, water-soluble substances are released in the extraction column upon contact with water.
Step (3), performing solid-liquid separation on the coffee slurry to obtain coffee grounds and coffee stock solution;
the coffee slurry is separated into coffee grounds and coffee raw liquid by high-speed centrifugation.
Screening the coffee stock solution through a 0.01-micrometer molecular film to remove macromolecular substances, heavy metals and pesticide residues;
concentrating the screened coffee stock solution to obtain concentrated coffee solution;
the low-concentration coffee base obtained after the solid-liquid separation was freeze-concentrated before freeze-drying by the apparatus of this example to obtain a concentrated coffee base. And (3) reducing the temperature of the freezing chamber to-12 ℃, synchronously reducing the temperature in the freezing tank, leading water in the coffee stock solution to freeze and float on the upper part of the liquid level in the freezing tank, continuously separating out the water in the coffee stock solution, floating on the upper layer of the solution after freezing, and taking out the lower layer of the solution after preserving the heat for 3.4 hours, thus obtaining the concentrated coffee stock solution with a large amount of water removed. The soluble solid content of the concentrated coffee liquid reaches 17.1 percent.
And (6) vacuumizing the concentrated coffee liquid at the temperature of-30 ℃, and freeze-drying to obtain the flash-dissolved reduced coffee powder.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A coffee stock solution concentration device is characterized by comprising a freezing chamber, wherein a freezing tank is arranged in the freezing chamber, the freezing tank is communicated with a steam conveying pipe and a coffee stock solution conveying pipe, a temperature sensor and a liquid level sensor are arranged in the freezing tank, the lower end of the freezing tank extends out of the freezing chamber, the bottom end of the freezing tank is communicated with a liquid outlet funnel, a material receiving container is arranged at the lower end of the liquid outlet funnel, the temperature sensor and the liquid level sensor are connected with a P L C controller, and a refrigerating device is communicated with the freezing chamber.
2. The coffee concentrate apparatus of claim 1, wherein: a bracket is arranged below the freezing chamber, one end of the coffee stock solution conveying pipe is communicated with a liquid storage tank, and the liquid storage tank is arranged beside the bracket.
3. The coffee concentrate apparatus of claim 2, wherein the coffee concentrate feeding pipe is provided with a pipe pump, the coffee concentrate feeding pipe between the pipe pump and the liquid storage tank is provided with a first solenoid valve, the coffee concentrate feeding pipe and the steam feeding pipe at the inlet of the freezing tank are respectively provided with a second solenoid valve and a third solenoid valve, the pipe at the lower end of the liquid outlet funnel is provided with a fourth solenoid valve, and the pipe pump and the solenoid valves are controlled by a P L C controller.
4. The coffee concentrate apparatus of claim 1, wherein: three temperature sensors are arranged on the freezing tank at different heights, and a temperature sensor is also arranged on the liquid outlet funnel.
5. The coffee concentrate apparatus of claim 1, wherein: one end of the liquid outlet funnel is hinged with the bottom end of the freezing tank.
6. The coffee concentrate apparatus of claim 1, wherein: the inner wall of the freezing chamber is provided with a heat insulation layer.
7. A method for concentrating coffee stock solution before freeze drying is characterized by comprising the following steps: the method comprises the following steps:
after the coffee stock solution to be concentrated is injected into the freezing tank, the temperature of the freezing chamber is reduced to-5 ℃ to 30 ℃, the temperature in the freezing tank is synchronously reduced, so that water in the coffee stock solution is frozen and floats on the upper part of the liquid level when the temperature of the freezing tank is reduced to the freezing point, the water in the coffee stock solution is continuously separated out in the heat preservation process, floats on the upper layer of the solution after being frozen, and the lower layer of the solution is taken out after a period of time, thus obtaining the concentrated coffee stock solution with a large amount of water removed.
8. A production method of flash-dissolved reduced coffee is characterized in that: the method comprises the following steps:
roasting and grinding green coffee beans to obtain ground coffee powder;
step (2), extracting the ground coffee powder with cold water to obtain coffee slurry;
step (3), performing solid-liquid separation on the coffee slurry to obtain coffee grounds and low-concentration coffee stock solution;
concentrating the obtained coffee stock solution to obtain concentrated coffee solution;
screening the concentrated coffee stock solution through a molecular membrane to remove macromolecular substances, heavy metals and pesticide residues;
and (6) freeze-drying the concentrated coffee liquid, and controlling the temperature to be below 0 ℃ to obtain the flash-dissolved reduced coffee powder.
9. The production method according to claim 8, characterized in that: in step (4), the low strength coffee concentrate is concentrated according to the method of claim 7 using the apparatus of any of claims 1-6 to obtain a high strength concentrated coffee.
10. The production method according to claim 8, characterized in that: in the step (2), the ground coffee powder and cold water are mixed according to the proportion of 1: 1-4, extracting in an extraction tower to obtain coffee slurry; in the step (4), the soluble solid content of the concentrated coffee liquid reaches more than 10 percent.
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| CN202010424385.XA CN111418690A (en) | 2020-05-19 | 2020-05-19 | Coffee stock solution concentrating device and production method of flash-dissolved reduced coffee |
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| CN202010424385.XA CN111418690A (en) | 2020-05-19 | 2020-05-19 | Coffee stock solution concentrating device and production method of flash-dissolved reduced coffee |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113519670A (en) * | 2021-07-27 | 2021-10-22 | 昆明凯澜创意科技有限公司 | Production equipment and method of high-concentration coffee liquid |
| CN115104660A (en) * | 2021-09-02 | 2022-09-27 | 周睿 | Cold-extraction freeze-dried coffee nutrition powder capable of improving body building efficiency and preparation method thereof |
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| CN115104660A (en) * | 2021-09-02 | 2022-09-27 | 周睿 | Cold-extraction freeze-dried coffee nutrition powder capable of improving body building efficiency and preparation method thereof |
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