CN108308368B - Soybean protein clear water treatment system and method - Google Patents
Soybean protein clear water treatment system and method Download PDFInfo
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- CN108308368B CN108308368B CN201810236917.XA CN201810236917A CN108308368B CN 108308368 B CN108308368 B CN 108308368B CN 201810236917 A CN201810236917 A CN 201810236917A CN 108308368 B CN108308368 B CN 108308368B
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
- A23J1/00—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites
- A23J1/14—Obtaining protein compositions for foodstuffs; Bulk opening of eggs and separation of yolks from whites from leguminous or other vegetable seeds; from press-cake or oil-bearing seeds
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- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23J—PROTEIN COMPOSITIONS FOR FOODSTUFFS; WORKING-UP PROTEINS FOR FOODSTUFFS; PHOSPHATIDE COMPOSITIONS FOR FOODSTUFFS
- A23J3/00—Working-up of proteins for foodstuffs
- A23J3/14—Vegetable proteins
- A23J3/16—Vegetable proteins from soybean
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C—CHEMISTRY; METALLURGY
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/08—Thin film evaporation
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- C—CHEMISTRY; METALLURGY
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
- C02F1/12—Spray evaporation
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- C—CHEMISTRY; METALLURGY
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/32—Nature of the water, waste water, sewage or sludge to be treated from the food or foodstuff industry, e.g. brewery waste waters
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The invention relates to the field of food production and processing, in particular to a soybean protein clear water treatment system and a soybean protein clear water treatment method. The bean clear water treatment system consists of a heating separation system, a separation liquid temporary storage tank, an evaporation concentration system, a concentrated liquid temporary storage tank and a spray drying system, wherein all the components are sequentially connected in series to form a continuous production line. Wherein the heating separation system consists of a steam direct contact heater and a disc type centrifugal separator; the evaporation concentration system consists of a centrifugal pump and a three-effect tube type falling film evaporator; the spray drying system consists of a rotor pump, a high-pressure pump, a spray gun and a drying tower. The soybean clear water treatment system and the method can comprehensively and efficiently treat the soybean clear water generated in the production process of the soybean protein, can produce a certain amount of soybean protein isolate while generating no other waste, and can discharge the soybean clear water treated by the method without sewage treatment.
Description
Technical Field
The invention relates to the field of food production and processing, in particular to a soybean protein clear water treatment system and a soybean protein clear water treatment method.
Background
The soybean protein is a plant complete protein, the amino acid composition of the soybean protein is similar to that of milk protein, the soybean protein contains a plurality of amino acids essential to human bodies, and the soybean protein is equivalent to animal protein in terms of nutritional value and is closest to human amino acid in terms of gene structure, so the soybean protein is the most nutritional plant protein. In addition, soy protein has incomparable advantages with animal protein, such as reducing cholesterol, and being easy to digest and absorb. The united states Food and Drug Administration (FDA) states: the risk of cardiovascular and cerebrovascular diseases can be obviously reduced by taking 25 g of soybean protein every day.
The Soybean Protein Isolate (SPI) is a complete protein food additive produced by using low-temperature desolventized soybean meal as a raw material. The isolated soy protein has a protein content of above 90% and contains approximately 20 amino acids, including various essential amino acids. The isolated soy protein is rich in nutrition, does not contain cholesterol, and is a few varieties capable of replacing animal protein in plant protein. Soy protein isolate has various functional properties such as dispersibility, emulsifiability, hydration, oil absorption, gelling, foaming and film forming properties, and is widely used in various fields of food production such as beverages, nutritional foods and fermented foods.
At present, soybean protein production enterprises generally adopt an alkali-soluble acid-precipitation process to extract soybean protein and a soybean protein isolate product from soybean meal, and when the soybean protein is extracted from the soybean meal, bean clear water generated in the extraction process enters a sewage treatment workshop to be treated by an air floatation anaerobic process. However, the whole process of air-float anaerobic treatment of the bean clear water in the sewage treatment plant needs to consume a large amount of materials and energy, and under the condition of not generating any economic benefit, strong pungent peculiar smell and a large amount of waste water and solid waste which are difficult to treat are generated, so that the production cost is increased, and a large burden is caused to the environment. In view of this, methods and facilities for efficiently cleaning soybean protein clear water are urgently needed in practical production.
Disclosure of Invention
The invention aims to provide a soybean protein bean clear water treatment system and a soybean protein bean clear water treatment method. The method can comprehensively and efficiently treat the bean clear water generated in the production process of the soybean protein, and can produce a certain amount of soybean protein isolate without generating any other waste.
The invention provides a soybean protein clear water treatment system, which comprises a heating separation system, a separation liquid temporary storage tank, an evaporation concentration system, a concentrated liquid temporary storage tank and a spray drying system, wherein the components are sequentially connected in series to form a continuous production line; wherein:
the heating separation system consists of a steam direct contact heater and a disc type centrifugal separator;
the evaporation concentration system consists of a centrifugal pump and a three-effect tube type falling-film evaporator, wherein the three-effect tube type falling-film evaporator comprises a first effect evaporator, a second effect evaporator and a third effect evaporator;
the spray drying system consists of a rotor pump, a high-pressure pump, a spray gun and a drying tower.
The soybean protein bean clear water treatment system disclosed by the invention adopts the steam direct contact heater, the utilization efficiency of steam heat can be maximally close to 100%, so that the heating temperature can be quickly adjusted, and tests prove that when the temperature of the feed liquid is controlled within the range of 65-75 ℃ (more preferably 68-73 ℃), the subsequent centrifugal separation equipment is facilitated to obtain the best separation effect.
The feed liquid heated to the target temperature directly enters the disc type centrifugal separator without entering the temporary storage tank, so that the phenomenon that part of heat of the feed liquid is flashed in the process of entering the temporary storage tank to cause unnecessary energy waste can be avoided; one conveying pump can be reduced, and the power consumption is reduced; the bacterial colony propagation caused by temporary storage of materials in the tank can be avoided, and the product quality is not influenced; the system length can be shortened, and the fault occurrence points can be reduced.
After the feed liquid enters the disc type centrifugal separator, the system separation is carried out, through tests, in order to ensure the feed liquid separation effect, the separation factor is controlled to be 4500-6000, and meanwhile, in consideration of energy consumption and product quality, the separation factor is more preferably 5000.
Separating supernatant obtained after separation enters a separating liquid temporary storage tank, and in order to ensure the quality of feed liquid and avoid colony propagation, the temporary storage time of the feed liquid must be strictly controlled, and is set to be 1-10 minutes, preferably 1-3 minutes.
The conditions for evaporative concentration obtained by screening were tested as follows:
pumping the material liquid into a first-effect evaporator from a separation liquid temporary storage tank through a centrifugal pump, wherein the temperature of the material liquid in the first-effect evaporator is controlled to be 80-85 ℃, and preferably 84 ℃;
pumping the feed liquid into a second-effect evaporator from a first-effect evaporator through a centrifugal pump, wherein the temperature of the feed liquid in the second-effect evaporator is controlled to be 65-70 ℃, and preferably 68 ℃;
pumping the material liquid into a third-effect evaporator from the second-effect evaporator through a centrifugal pump, wherein the temperature of the material liquid in the third-effect evaporator is controlled to be 52-57 ℃, and preferably 54 ℃;
the working termination point of the third effect evaporator is set to be when the feed liquid in the third effect evaporator is concentrated until the solid content reaches 15-20%; in view of both energy consumption and yield, 18% is preferable.
And (3) enabling the concentrated solution obtained after the concentration to enter a concentrated solution temporary storage tank, and strictly controlling the temporary storage time of the feed liquid for ensuring the quality of the feed liquid and avoiding bacterial colony propagation, wherein the temporary storage time is set to be 1-8 minutes, and preferably 1-2 minutes.
The concentrated solution in the concentrated solution temporary storage tank is sent into a high-pressure pump through a rotor pump, the high-pressure pump sprays the concentrated solution into a drying tower under pressure, in order to ensure the spraying effect and the quality of a dried product, a hollow cone-shaped nozzle is preferably selected as a spraying gun, and the spraying pressure is set to be 15-30Mpa, preferably 20 Mpa; meanwhile, in order to control the moisture of the product, the air supply temperature of the drying tower is controlled to be 180-.
In conclusion, the working conditions of the components in the soybean protein bean clear water treatment system are as follows:
(1) the temperature control range of a steam direct contact heater in the heating separation system is set to be 65-75 ℃;
(2) the separation factor of the disc centrifuge in the thermal separation system was set at 4500-;
(3) the temporary storage time of the separation liquid obtained after the separation in the separation liquid temporary storage tank is set to be 1-10 minutes;
(4) the temperature control range of the feed liquid in the first-effect evaporator in the evaporation concentration system is set to be 80-85 ℃;
(5) the temperature control range of the feed liquid in the second effect evaporator in the evaporation concentration system is set to be 65-70 ℃;
(6) the temperature control range of the feed liquid in the third effect evaporator in the evaporation concentration system is set to be 52-57 ℃;
(7) the working termination point of the third effect evaporator is set to be when the feed liquid in the third effect evaporator is concentrated until the solid content reaches 15-20%;
(8) setting the temporary storage time of the concentrated solution obtained after the concentration in a concentrated solution temporary storage tank to be 1-8 minutes;
(9) the spray pressure of a high-pressure pump in the spray drying system is set to be 15-30 Mpa;
(10) the control range of the air supply temperature of the drying tower in the spray drying system is set to be 180-195 ℃, and the control range of the air exhaust temperature is set to be 70-80 ℃.
Preferably, the working conditions of the components in the soy protein bean clear water treatment system are as follows:
(1) the temperature control range of a steam direct contact heater in the heating separation system is set to be 68-73 ℃;
(2) the separation factor of the disc centrifuge in the thermal separation system was set to 5000;
(3) the temporary storage time of the separation liquid obtained after the separation in the separation liquid temporary storage tank is set to be 1-3 minutes;
(4) the temperature of feed liquid in a first-effect evaporator in the evaporation concentration system is controlled to be set to 84 ℃;
(5) the temperature of feed liquid in a second-effect evaporator in the evaporation concentration system is controlled to be 68 ℃;
(6) the temperature of feed liquid in a third-effect evaporator in the evaporation concentration system is controlled to be 54 ℃;
(7) the working termination point of the third effect evaporator is set to be when the feed liquid in the third effect evaporator is concentrated until the solid content reaches 18%;
(8) setting the temporary storage time of the concentrated solution obtained after the concentration in a concentrated solution temporary storage tank to be 1-2 minutes;
(9) the spray pressure of the high-pressure pump in the spray drying system is set to be 20 Mpa;
(10) the air supply temperature of the drying tower in the spray drying system is controlled to be 190 ℃, and the air exhaust temperature is controlled to be 74 ℃.
Further preferably, the spray gun in the spray drying system adopts a hollow cone nozzle.
Secondly, the invention also provides a soybean protein clear water treatment method, which comprises the following steps:
(1) pumping clear water of soybean protein beans into a steam direct contact type heater through a centrifugal pump, starting a steam pipeline valve, and controlling the heating temperature to be 65-75 ℃ through a back pressure valve;
(2) directly pumping the heated bean clear water into a disc type centrifugal separator, setting the separation factor of the centrifugal separator to be 4500-;
(3) starting a centrifugal pump, pumping separated supernatant in a separated liquid temporary storage tank into a three-effect tubular falling-film evaporator, and sequentially carrying out evaporation concentration in a first-effect evaporator, a second-effect evaporator and a third-effect evaporator, wherein the temperature of feed liquid in the first-effect evaporator is controlled to be 80-85 ℃, the temperature of feed liquid in the second-effect evaporator is controlled to be 65-70 ℃, the temperature of feed liquid in the third-effect evaporator is controlled to be 52-57 ℃, when the feed liquid is concentrated in the third-effect evaporator until the solid content reaches 15-20%, the concentration is stopped, the obtained concentrated liquid enters the concentrated liquid temporary storage tank, and the temporary storage time is controlled to be 1-8 minutes;
(4) sending the concentrated solution in the concentrated solution temporary storage tank into a high-pressure pump through a rotor pump, starting the high-pressure pump, and carrying out pressure spraying on the concentrated solution in a drying tower, wherein a spray gun adopts a hollow cone-shaped nozzle, and the spraying pressure is set to be 15-30 Mpa; the air supply temperature of the drying tower is controlled to be 180-195 ℃, the air exhaust temperature is controlled to be 70-80 ℃, and the obtained product is packaged after spray drying is finished.
Preferably, the soybean protein bean clear water treatment method comprises the following steps:
(1) pumping clear water of soybean protein beans into a steam direct contact type heater through a centrifugal pump, starting a steam pipeline valve, and controlling the heating temperature to be 68-73 ℃ through a back pressure valve;
(2) directly pumping the heated bean clear water into a disc type centrifugal separator, setting the separation factor of the centrifugal separator to be 5000, directly feeding the separated supernatant obtained after the separation into a separation liquid temporary storage tank, and controlling the temporary storage time to be 1-3 minutes;
(3) starting a centrifugal pump, pumping separated supernatant in a separated liquid temporary storage tank into a three-effect tubular falling-film evaporator, and sequentially carrying out evaporation concentration in a first-effect evaporator, a second-effect evaporator and a third-effect evaporator, wherein the temperature of feed liquid in the first-effect evaporator is controlled to be 84 ℃, the temperature of feed liquid in the second-effect evaporator is controlled to be 68 ℃, the temperature of feed liquid in the third-effect evaporator is controlled to be 54 ℃, when the feed liquid is concentrated in the third-effect evaporator until the solid content reaches 18%, the concentration is stopped, the obtained concentrated liquid enters the concentrated liquid temporary storage tank, and the temporary storage time is controlled to be 1-2 minutes;
(4) sending the concentrated solution in the concentrated solution temporary storage tank into a high-pressure pump through a rotor pump, starting the high-pressure pump, and carrying out pressure spraying on the concentrated solution in a drying tower, wherein a spray gun adopts a hollow cone-shaped nozzle, and the spraying pressure is set to be 20 Mpa; the air supply temperature of the drying tower is controlled to be 190 ℃, the air exhaust temperature is controlled to be 74 ℃, and the obtained product is packaged after spray drying is finished.
Production tests prove that the soybean protein clear water treatment system and method can comprehensively and efficiently treat soybean clear water generated in the production process of soybean protein, can produce a certain amount of soybean protein isolate while generating no other waste, and the soybean clear water treated by the method can reach the emission standard without sewage treatment. If the method can be popularized and applied in the field of soybean protein production, considerable economic benefits are expected to be generated.
Drawings
FIG. 1 is a diagram of a soybean protein bean clear water treatment system of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples is for the purpose of describing particular embodiments, and is not intended to limit the scope of the present invention; in the description and claims of the present application, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any value therebetween can be selected unless the invention otherwise indicated. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In addition to the specific methods, devices, and materials used in the examples, any methods, devices, and materials similar or equivalent to those described in the examples may be used in the practice of the invention in addition to the specific methods, devices, and materials used in the examples, in keeping with the knowledge of one skilled in the art and with the description of the invention.
Example 1
A soybean protein clear water treatment system comprises a heating separation system, a separation liquid temporary storage tank, an evaporation concentration system, a concentrated liquid temporary storage tank and a spray drying system, wherein the components are sequentially connected in series to form a continuous production line (shown in figure 1); wherein:
the heating separation system consists of a steam direct contact heater and a disc type centrifugal separator;
the evaporation concentration system consists of a centrifugal pump and a three-effect tube type falling-film evaporator, wherein the three-effect tube type falling-film evaporator comprises a first effect evaporator, a second effect evaporator and a third effect evaporator;
the spray drying system consists of a rotor pump, a high-pressure pump, a spray gun (hollow cone nozzle) and a drying tower.
The working conditions of each component in the soybean protein bean clear water treatment system are as follows:
(1) the temperature control range of a steam direct contact heater in the heating separation system is set to be 68-73 ℃;
(2) the separation factor of the disc centrifuge in the thermal separation system was set to 5000;
(3) the temporary storage time of the separation liquid obtained after the separation in the separation liquid temporary storage tank is set to be 1-3 minutes;
(4) the temperature of feed liquid in a first-effect evaporator in the evaporation concentration system is controlled to be set to 84 ℃;
(5) the temperature of feed liquid in a second-effect evaporator in the evaporation concentration system is controlled to be 68 ℃;
(6) the temperature of feed liquid in a third-effect evaporator in the evaporation concentration system is controlled to be 54 ℃;
(7) the working termination point of the third effect evaporator is set to be when the feed liquid in the third effect evaporator is concentrated until the solid content reaches 18%;
(8) setting the temporary storage time of the concentrated solution obtained after the concentration in a concentrated solution temporary storage tank to be 1-2 minutes;
(9) the spray pressure of the high-pressure pump in the spray drying system is set to be 20 Mpa;
(10) the air supply temperature of the drying tower in the spray drying system is controlled to be 190 ℃, and the air exhaust temperature is controlled to be 74 ℃.
Example 2
A soybean protein bean clear water treatment method comprises the following steps:
(1) pumping clear water of soybean protein beans into a steam direct contact type heater through a centrifugal pump, starting a steam pipeline valve, and controlling the heating temperature to be 68-73 ℃ through a back pressure valve;
(2) directly pumping the heated bean clear water into a disc type centrifugal separator, setting the separation factor of the centrifugal separator to be 5000, directly feeding the separated supernatant obtained after the separation into a separation liquid temporary storage tank, and controlling the temporary storage time to be 1-3 minutes;
(3) starting a centrifugal pump, pumping separated supernatant in a separated liquid temporary storage tank into a three-effect tubular falling-film evaporator, and sequentially carrying out evaporation concentration in a first-effect evaporator, a second-effect evaporator and a third-effect evaporator, wherein the temperature of feed liquid in the first-effect evaporator is controlled to be 84 ℃, the temperature of feed liquid in the second-effect evaporator is controlled to be 68 ℃, the temperature of feed liquid in the third-effect evaporator is controlled to be 54 ℃, when the feed liquid is concentrated in the third-effect evaporator until the solid content reaches 18%, the concentration is stopped, the obtained concentrated liquid enters the concentrated liquid temporary storage tank, and the temporary storage time is controlled to be 1-2 minutes;
(4) sending the concentrated solution in the concentrated solution temporary storage tank into a high-pressure pump through a rotor pump, starting the high-pressure pump, and carrying out pressure spraying on the concentrated solution in a drying tower, wherein a spray gun adopts a hollow cone-shaped nozzle, and the spraying pressure is set to be 20 Mpa; the air supply temperature of the drying tower is controlled to be 190 ℃, the air exhaust temperature is controlled to be 74 ℃, and the obtained product is packaged after spray drying is finished.
While the preferred embodiments and examples of the present invention have been described in detail, the present invention is not limited to the embodiments and examples, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art.
Claims (2)
1. A soybean protein bean clear water treatment method comprises the following steps:
(1) pumping clear water of soybean protein beans into a steam direct contact type heater through a centrifugal pump, starting a steam pipeline valve, and controlling the heating temperature to be 65-75 ℃ through a back pressure valve;
(2) directly pumping the heated bean clear water into a disc type centrifugal separator, setting the separation factor of the centrifugal separator to be 4500-;
(3) starting a centrifugal pump, pumping separated supernatant in a separated liquid temporary storage tank into a three-effect tubular falling-film evaporator, and sequentially carrying out evaporation concentration in a first-effect evaporator, a second-effect evaporator and a third-effect evaporator, wherein the temperature of feed liquid in the first-effect evaporator is controlled to be 80-85 ℃, the temperature of feed liquid in the second-effect evaporator is controlled to be 65-70 ℃, the temperature of feed liquid in the third-effect evaporator is controlled to be 52-57 ℃, when the feed liquid is concentrated in the third-effect evaporator until the solid content reaches 15-20%, the concentration is stopped, the obtained concentrated liquid enters the concentrated liquid temporary storage tank, and the temporary storage time is controlled to be 1-8 minutes;
(4) sending the concentrated solution in the concentrated solution temporary storage tank into a high-pressure pump through a rotor pump, starting the high-pressure pump, and carrying out pressure spraying on the concentrated solution in a drying tower, wherein a spray gun adopts a hollow cone-shaped nozzle, and the spraying pressure is set to be 15-30 Mpa; controlling the air supply temperature of the drying tower to be 180-195 ℃, controlling the air exhaust temperature to be 70-80 ℃, and packaging the obtained product after spray drying is finished;
the treatment method adopts a soybean protein clear water treatment system, the soybean protein clear water treatment system consists of a heating separation system, a separation liquid temporary storage tank, an evaporation concentration system, a concentrated liquid temporary storage tank and a spray drying system, and all the components are sequentially connected in series to form a continuous production line; wherein:
the heating separation system consists of a steam direct contact heater and a disc type centrifugal separator;
the evaporation concentration system consists of a centrifugal pump and a three-effect tube type falling-film evaporator, wherein the three-effect tube type falling-film evaporator comprises a first effect evaporator, a second effect evaporator and a third effect evaporator;
the spray drying system consists of a rotor pump, a high-pressure pump, a spray gun and a drying tower.
2. The soybean protein bean water treatment method of claim 1, comprising the steps of:
(1) pumping clear water of soybean protein beans into a steam direct contact type heater through a centrifugal pump, starting a steam pipeline valve, and controlling the heating temperature to be 68-73 ℃ through a back pressure valve;
(2) directly pumping the heated bean clear water into a disc type centrifugal separator, setting the separation factor of the centrifugal separator to be 5000, directly feeding the separated supernatant obtained after the separation into a separation liquid temporary storage tank, and controlling the temporary storage time to be 1-3 minutes;
(3) starting a centrifugal pump, pumping separated supernatant in a separated liquid temporary storage tank into a three-effect tubular falling-film evaporator, and sequentially carrying out evaporation concentration in a first-effect evaporator, a second-effect evaporator and a third-effect evaporator, wherein the temperature of feed liquid in the first-effect evaporator is controlled to be 84 ℃, the temperature of feed liquid in the second-effect evaporator is controlled to be 68 ℃, the temperature of feed liquid in the third-effect evaporator is controlled to be 54 ℃, when the feed liquid is concentrated in the third-effect evaporator until the solid content reaches 18%, the concentration is stopped, the obtained concentrated liquid enters the concentrated liquid temporary storage tank, and the temporary storage time is controlled to be 1-2 minutes;
(4) sending the concentrated solution in the concentrated solution temporary storage tank into a high-pressure pump through a rotor pump, starting the high-pressure pump, and carrying out pressure spraying on the concentrated solution in a drying tower, wherein a spray gun adopts a hollow cone-shaped nozzle, and the spraying pressure is set to be 20 Mpa; the air supply temperature of the drying tower is controlled to be 190 ℃, the air exhaust temperature is controlled to be 74 ℃, and the obtained product is packaged after spray drying is finished.
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