CN116531779A - Application of mechanical vapor compression system in tomato sauce processing - Google Patents
Application of mechanical vapor compression system in tomato sauce processing Download PDFInfo
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- CN116531779A CN116531779A CN202310438584.XA CN202310438584A CN116531779A CN 116531779 A CN116531779 A CN 116531779A CN 202310438584 A CN202310438584 A CN 202310438584A CN 116531779 A CN116531779 A CN 116531779A
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- evaporator
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- 230000006835 compression Effects 0.000 title claims abstract description 31
- 238000007906 compression Methods 0.000 title claims abstract description 31
- 238000012545 processing Methods 0.000 title claims abstract description 28
- 235000007688 Lycopersicon esculentum Nutrition 0.000 title claims abstract description 25
- 235000015067 sauces Nutrition 0.000 title claims abstract description 24
- 240000003768 Solanum lycopersicum Species 0.000 title claims description 24
- 238000001704 evaporation Methods 0.000 claims abstract description 73
- 230000008020 evaporation Effects 0.000 claims abstract description 70
- 235000015193 tomato juice Nutrition 0.000 claims abstract description 50
- 238000010438 heat treatment Methods 0.000 claims description 101
- 239000007788 liquid Substances 0.000 claims description 47
- 238000000926 separation method Methods 0.000 claims description 42
- 239000002994 raw material Substances 0.000 claims description 21
- 238000004891 communication Methods 0.000 claims description 13
- 235000015113 tomato pastes and purées Nutrition 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 239000003365 glass fiber Substances 0.000 claims description 3
- 241000196324 Embryophyta Species 0.000 claims 1
- 239000003595 mist Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 23
- 241000227653 Lycopersicon Species 0.000 abstract 1
- 239000010408 film Substances 0.000 description 18
- 239000000243 solution Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 239000011550 stock solution Substances 0.000 description 8
- 239000011552 falling film Substances 0.000 description 7
- 230000009194 climbing Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000005484 gravity Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000009835 boiling Methods 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 4
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 239000012153 distilled water Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 235000013365 dairy product Nutrition 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 235000015203 fruit juice Nutrition 0.000 description 1
- 235000011389 fruit/vegetable juice Nutrition 0.000 description 1
- 239000008258 liquid foam Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- 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
- A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
- A23L27/60—Salad dressings; Mayonnaise; Ketchup
- A23L27/63—Ketchup
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/28—Evaporating with vapour compression
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Nutrition Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Polymers & Plastics (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to the technical field of tomato juice evaporation processing, in particular to application of a mechanical vapor compression system in tomato sauce processing, the mechanical vapor compression system comprises a material tank, a first feed pump is arranged at the discharge end of the material tank in a communicating way through a pipeline, a first preheater is arranged at the first feed pump in a communicating way through a pipeline, and a second preheater is arranged at the first preheater in a communicating way through a pipeline.
Description
Technical Field
The invention relates to the technical field of tomato juice evaporation processing, in particular to a mechanical vapor compression system and application thereof.
Background
The evaporator is widely applied to the fields of food processing, fruit juice concentration, beverage production, dairy production, chemical industry, pharmaceutical industry, wastewater treatment, environmental protection engineering and the like, the mechanical vapor compression (MVR) evaporator is used for compressing and evaporating secondary vapor generated by utilizing an energy-efficient vapor compressor, the pressure and the temperature of the secondary vapor are improved, the secondary vapor with heat energy is pumped into a heater to heat the stock solution, and the heated stock solution is continuously evaporated to generate the secondary vapor, so that a continuous evaporation state is realized.
However, the existing mechanical vapor compression (MVR) evaporators all adopt a tube array climbing film evaporation system, through separating a heating chamber from an evaporation chamber (a separation chamber), feed liquid enters a heating tube from the bottom, and is quickly vaporized after heated boiling, vapor quickly rises in the tube, the feed liquid is driven by high-speed rising vapor, forms film-shaped rising along the tube wall and continues to evaporate, vapor and liquid are separated at the top, secondary vapor overflows from the top, and finished liquid is discharged from the bottom, but the upward climbing film of the material is not easy to control, so that the phenomenon of dry wall easily occurs at the upper part of the evaporator.
Accordingly, there is a need for a mechanical vapor compression system and application thereof that addresses the above-described issues.
Disclosure of Invention
In order to solve the technical problems, the invention provides an application of a mechanical vapor compression system in tomato sauce processing.
The invention provides a mechanical vapor compression system in tomato sauce processing, which comprises a raw material tank, wherein a first feed pump is arranged at the discharge end of the raw material tank in a communicating way through a pipeline, a first preheater is arranged at the first feed pump in a communicating way through a pipeline, a second preheater is arranged at the first preheater in a communicating way through a pipeline, and an evaporation device is arranged at the discharge end of the second preheater in a communicating way through a pipeline. When the device is used, 4.5-5% of tomato juice stock solution is pumped into the first preheater through the first feed pump, the temperature is raised to 70 ℃, then the tomato juice stock solution is conveyed into the second preheater, the temperature is raised to 78 ℃, the preheating of tomato juice is realized, the tomato juice stock solution enters the circulating pump, and then enters the evaporation device to exchange heat with steam.
Preferably, the evaporation device comprises a first feeding pipe, a first heating evaporator, a first evaporation separation chamber, a second feeding pump, a second feeding pipe, a second heating evaporator and a second evaporation separation chamber, wherein the first feeding pipe is fixedly arranged at the discharge end of the second preheater, one end of the first feeding pipe, which is far away from the second preheater, is communicated with the first heating evaporator, one end of the first feeding pipe, which is far away from the second preheater, is communicated with the top of the first heating evaporator, the first evaporation separation chamber is arranged at the bottom discharge end of the first heating evaporator, one end of the first evaporation separation chamber, which is far away from the first heating evaporator, is communicated with the second feeding pump through a pipeline, the second feeding pipe is arranged at the discharge pipe of the second feeding pump through a pipeline, one end of the second feeding pipe, which is far away from the second feeding pump, is communicated with the top of the second heating evaporator, and the second evaporation separation chamber is arranged at the bottom of the second heating evaporator through a pipeline. The tomato juice raw material liquid filled from the second preheater is conveyed to the top of the first heating evaporator through the first feeding pipe, forms membranous decline along the inner wall of the pipe under the action of gravity and evaporates, the concentrated liquid enters the first evaporation separation chamber from the bottom of the first heating evaporator and is discharged from the bottom, the secondary steam overflows from the top, the concentrated liquid is conveyed to the second heating evaporator along with the conveying of the second feeding pump, and the concentrated liquid enters the second evaporation separation chamber from the bottom of the second heating evaporator and is discharged from the bottom.
Preferably, the first evaporation separation chamber and the second evaporation separation chamber are internally provided with a baffling type and cyclone type parallel connected tortuous channel demisting device. Larger droplets in the rising vapor may be separated.
Preferably, the upper ends of the first evaporation separation chamber and the second evaporation separation chamber adopt glass fiber dipping fluorosilicone oil candle type demisters. The device can separate tiny liquid drops (liquid drops less than or equal to 2 um) carried in the secondary steam, the secondary steam is subjected to two-stage demisting separation in the separator, and the liquid drop carried in the steam can be reduced to 0.1%, so that the quality of distilled water is greatly improved, the service life of equipment is prolonged, and long-term stable operation of a compressor is ensured.
Preferably, the first heating evaporator and the second heating evaporator are internally provided with film distributing devices. The materials are distributed into the heat exchange tube in a film shape through the film distributor, the material solution is heated by steam outside the tube when flowing down the tube cavity by virtue of attraction force, evaporation is generated after the material solution reaches the evaporation temperature, and the material solution flows down from the tube together with secondary steam to evaporate in a film form.
Preferably, the air outlet holes of the first heating evaporator and the second heating evaporator are communicated through a pipeline and are provided with a steam compressor. After being compressed by a vapor compressor, the secondary vapor is sent into the falling film heating chamber shell side of the first heating evaporator and the second heating evaporator, and the falling film heating chamber shell side is provided with a plate, so as to guide the secondary vapor, condense and discharge the non-condensable gas.
Preferably, the condensed water of the first heating evaporator and the condensed water of the second heating evaporator are communicated with the condensed water tank through pipelines. The condensed water is collected and discharged intensively.
Preferably, the first heating evaporator and the second heating evaporator are internally provided with high-efficiency foam removers. After the droplets entrained in the secondary steam generated by evaporation enter the separator, the liquid droplets are attached to the wall of the separator under the centrifugal action and can be removed by the efficient demister.
Preferably, gas collecting spaces are arranged at the gas outlet ends of the first heating evaporator and the second heating evaporator. The non-condensable gases at the gas outlet ends of the first and second heating evaporators may be vented by an automatic control system as a function of pressure.
The scheme also comprises the application of the mechanical vapor compression system in the production of tomato paste, and the mechanical vapor compression system comprises the following steps:
s1, pumping 4.5-5% tomato juice in a raw material tank to a first preheater through a first feeding pump, wherein the first preheater is provided with a vacuum degree of-54 Kpa and a temperature of 70 ℃, the concentration of the tomato juice is about 5.2-5.5%, and then conveying the tomato juice into a second preheater, and the second preheater is provided with a vacuum degree of-67 Kpa and a temperature of 78 ℃, and the concentration of the tomato juice is about 8-8.5%, so that preheating of the tomato juice is realized;
s2, along with continuous operation of the first feeding pump, tomato juice raw material liquid filled out of the second preheater is sequentially conveyed to the tops of the first heating evaporator and the second heating evaporator, the tomato juice discharging concentration is about 37%, and then tomato paste with the concentration of about 37% is stored in a finished product storage tank through a pipeline, so that production of the tomato paste is realized.
Compared with the related art, the application of the mechanical vapor compression system in tomato sauce processing has the following beneficial effects:
(1) When the mechanical vapor compression system is applied to tomato sauce processing, compared with the prior art, tomato juice in a raw material tank is pumped to a first preheater through a first feeding pump and then is conveyed to a second preheater, so that the tomato juice is preheated, the flow of a material circulating pump is greatly reduced, and the power consumption of the material circulating pump is reduced;
(2) According to the application of the mechanical vapor compression system in tomato sauce processing, the tomato juice raw material liquid filled in the second preheater is conveyed to the top of the first heating evaporator through the first feeding pipe along with the continuous operation of the first feeding pump, the tomato juice raw material liquid forms a membranous decline along the inner wall of the pipe under the action of gravity and is evaporated, concentrated liquid enters the first evaporation separation chamber from the bottom of the first heating evaporator and is discharged from the bottom, secondary vapor overflows from the top, the concentrated liquid is conveyed to the second heating evaporator along with the conveying of the second feeding pump, the concentrated liquid enters the second evaporation separation chamber from the bottom of the second heating evaporator and is discharged from the bottom of the second heating evaporator, so that the tomato juice is evaporated and concentrated, in the process, the conditions that the existing climbing film evaporator is difficult to control the material to climb up the film and the drying wall is easy to appear at the upper part of the evaporator are solved, the retention time of the tomato juice inside the first heating evaporator and the second heating evaporator is reduced, the heating time of the tomato juice is shortened, and the quality of tomato sauce is adversely affected by heating the tomato product is shortened.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a second schematic diagram of the overall structure of the present invention.
Reference numerals in the drawings: 1. a raw material tank; 2. a first feed pump; 3. a first preheater; 4. a second preheater; 5. an evaporation device; 6. a first feed tube; 7. a first heating evaporator; 8. a first evaporation separation chamber; 9. a second feed pump; 10. a second feed tube; 11. a second heating evaporator; 12. and a second evaporation separation chamber.
Detailed Description
The invention will be further described with reference to fig. 1, 2 and embodiments.
Example 1
Referring to fig. 1 and 2, a mechanical vapor compression system in tomato sauce processing includes a raw material tank 1, a first feed pump 2 is installed at a discharge end of the raw material tank 1 through pipeline communication, a first preheater 3 is installed at the first feed pump 2 through pipeline communication, a second preheater 4 is installed at the first preheater 3 through pipeline communication, and an evaporation device 5 is installed at a discharge end of the second preheater 4 through pipeline communication. When the device is used, 4.5-5% of tomato juice stock solution is sent to the first preheater 3 through the first feed pump 2, the temperature is raised to 70 ℃, then the tomato juice stock solution is sent to the second preheater 4, the temperature is raised to 78 ℃, the preheating of tomato juice is realized, the tomato juice stock solution enters the circulating pump, and then enters the evaporation device 5 to exchange heat with steam.
According to the invention, the evaporation device 5 comprises a first feeding pipe 6, a first heating evaporator 7, a first evaporation separation chamber 8, a second feeding pump 9, a second feeding pipe 10, a second heating evaporator 11 and a second evaporation separation chamber 12, wherein the first feeding pipe 6 is fixedly arranged at the discharge end of the second preheater 4, one end of the first feeding pipe 6 far away from the second preheater 4 is communicated with the first heating evaporator 7, one end of the first feeding pipe 6 far away from the second preheater 4 is communicated with the top of the first heating evaporator 7, the first evaporation separation chamber 8 is arranged at the discharge end of the bottom of the first heating evaporator 7, the second feeding pump 9 is arranged at the end of the first evaporation separation chamber 8 far away from the first heating evaporator 7 in a pipeline communication manner, the second feeding pipe 10 is arranged at the discharge pipe of the second feeding pump 9 in a pipeline communication manner, the second heater 11 is arranged at the end of the second feeding pipe 10 far away from the second feeding pump 9 in a communication manner, the second feeding pipe 10 is communicated with the top of the second heater 11, and the second evaporator 12 is arranged at the bottom of the second heating evaporator 11 in a communication manner. The tomato juice raw material liquid filled from the second preheater 4 is conveyed to the top of the first heating evaporator 7 through the first feeding pipe 6, forms membranous decline along the inner wall of the pipe under the action of gravity and evaporates, the concentrated solution enters into the first evaporation separation chamber 8 from the bottom of the first heating evaporator 7 and is discharged from the bottom, the secondary steam overflows from the top, the concentrated solution is conveyed to the second heating evaporator 11 along with the conveying of the second feeding pump 9, the concentrated solution enters into the second evaporation separation chamber 12 from the bottom of the second heating evaporator 11 and is discharged from the bottom, and in the process, the concentrated solution is evaporated from the top of the first heating evaporator 7 from top to bottom by falling film, so that the conditions that the traditional climbing film evaporator is difficult to control due to the upward climbing of the material and the phenomenon that the wall is easy to appear on the upper part of the evaporator are solved.
In the invention, a deflection type and cyclone type parallel connected tortuous passage demister is arranged in the first evaporation separation chamber 8 and the second evaporation separation chamber 12. Larger droplets in the rising vapor may be separated.
In the invention, the upper ends of the first evaporation separation chamber 8 and the second evaporation separation chamber 12 adopt glass fiber dipping fluorosilicone oil candle type demisters. The liquid drops with the small liquid drops less than or equal to 2um in the secondary steam can be separated, the secondary steam is subjected to two-stage demisting separation in the separator, the liquid drop entrainment in the steam can be reduced to 0.1%, the quality of distilled water can be greatly improved, the service life of equipment is prolonged, and long-term stable operation of the compressor is ensured.
In the invention, the first heating evaporator 7 and the second heating evaporator 11 are respectively provided with a film distributor inside. The materials are distributed into the heat exchange tube in a film shape through the film distributor, the material solution is heated by steam outside the tube when flowing down the tube cavity by virtue of attraction force, evaporation is generated after the material solution reaches the evaporation temperature, and the material solution flows down from the tube together with secondary steam to evaporate in a film form.
In the invention, the air outlet holes of the first heating evaporator 7 and the second heating evaporator 11 are communicated with each other through a pipeline and are provided with a steam compressor. After being compressed by a vapor compressor, the secondary vapor is sent into the falling film heating chamber shell side of the first heating evaporator 7 and the second heating evaporator 11, and the falling film heating chamber shell side is provided with a plate, so that the secondary vapor is guided to be condensed and the non-condensable gas is discharged.
In the invention, the condensed water of the first heating evaporator 7 and the second heating evaporator 11 is communicated with a condensed water tank through a pipeline. The condensed water is collected and discharged intensively.
Referring to fig. 1 and 2 in combination, the first heating evaporator 7 and the second heating evaporator 11 are both internally provided with efficient demisters. After the droplets entrained in the secondary steam generated by evaporation enter the separator, the liquid droplets are attached to the wall of the separator under the centrifugal action and can be removed by the efficient demister.
In the invention, the gas outlet ends of the first heating evaporator 7 and the second heating evaporator 11 are provided with gas collecting spaces. The noncondensable gases at the gas outlet ends of the first heating evaporator 7 and the second heating evaporator 11 can be discharged by an automatic control system according to the pressure.
In the invention, the application of the mechanical vapor compression system in the production of tomato paste comprises the following steps:
s1, delivering tomato juice with the concentration of 4.5-5% in a raw material tank 1 to a first preheater 3 through a first feed pump 2, setting vacuum degree-54 Kpa at the first preheater 3 and the temperature of 70 ℃, concentrating the tomato juice to about 5.2-5.5%, then delivering the tomato juice to a second preheater 4, setting vacuum degree-67 Kpa at the second preheater 4 and the temperature of 78 ℃, concentrating the tomato juice to about 8-8.5%, and preheating the tomato juice;
s2, along with the continuous operation of the first feeding pump 2, the tomato juice raw material liquid filled out of the second preheater 4 is sequentially conveyed to the tops of the first heating evaporator 7 and the second heating evaporator 11, the tomato juice discharging concentration is about 37%, and then tomato paste with the concentration of about 37% is stored in a finished product storage tank through a pipeline, so that the production of the tomato paste is realized.
Working principle: tomato juice in the feed tank 1 is sent to the first preheater 3 through the first feed pump 2, and then is sent to the second preheater 4, preheating of tomato juice is achieved, along with continuous operation of the first feed pump 2, tomato juice raw material liquid filled out of the second preheater 4 is sent to the top of the first heating evaporator 7 through the first feed pipe 6, film-shaped descent is formed along the inner wall of the pipe under the action of gravity and evaporation is carried out, concentrated liquid enters the first evaporation separation chamber 8 from the bottom of the first heating evaporator 7 and is discharged from the bottom, secondary steam overflows from the top, concentrated liquid is sent to the second heating evaporator 11 along with the conveying of the second feed pump 9, concentrated liquid enters the second evaporation separation chamber 12 from the bottom of the second heating evaporator 11, evaporation concentration of tomato juice is achieved, and in the process, the conditions that the existing film-lifting evaporator is difficult to control the film-lifting due to material climbing up and dry wall on the upper portion of the evaporator are solved.
Comparative examples
The mechanical vapor compression system mentioned in example 1 is an improved and practical tomato paste processing evaporator, and a forced circulation evaporator is also used in the past tomato paste processing;
the forced circulation evaporator consists of a heating chamber, an evaporation crystallization chamber, a condenser, a circulating pump, a vacuum and drainage system, a gas-liquid separation chamber, a secondary steam flash tank, a salt separator, an operation platform, a detection instrument, an electric instrument control cabinet, a valve, a pipeline system and the like, and consists of a heat exchange chamber and a crystallization evaporator; the liquid is circulated in the tube array by a circulating pump and heated to overheat at a temperature higher than the boiling point of the normal liquid. After entering the separator, the pressure of the liquid drops rapidly to cause the flash evaporation of part of the liquid or the rapid boiling, and the secondary steam generated by the evaporation enters the next evaporator to be heated or enters the condenser to be condensed. The concentrated solution is circularly pumped to a salt separator, and solid brine is effectively separated in the salt separator;
the forced circulation evaporator operates under vacuum low temperature condition, and has the features of fast material liquid flow rate, fast evaporation, less scaling, etc. the forced circulation evaporator may be divided into single effect, double effect and multiple effect evaporators, and the evaporator is one heating chamber to provide heat for evaporation to liquid to promote the boiling and vaporization of liquid, and the evaporating chamber has great amount of liquid foam produced in the heating chamber to the evaporating chamber in relatively great space.
Forced circulation evaporator application range: the forced circulation evaporator is suitable for scaling-prone liquid and high-viscosity liquid, is used as a high-concentration device in a multi-effect evaporation device, and is very suitable for being used as a crystallization evaporator of salt solution, and is characterized in that:
1. the whole set of system has reasonable and attractive design, stable operation, high efficiency, energy conservation and low steam consumption; the concentration ratio is large, forced circulation type is adopted, so that feed liquid with high viscosity is easy to flow and evaporate, and the concentration time is short;
2. the special design can realize switching and efficiency improvement through simple operation so as to adapt to the production of different products;
3. the evaporation temperature is low, the heat is fully utilized, the material liquid is heated gently, and the method is suitable for concentrating heat-sensitive materials;
4. the evaporator is heated uniformly in the pipe through forced circulation, has high heat transfer coefficient and can prevent the phenomenon of dry wall;
5. the feed liquid enters the separator for separation, so that the separation effect is enhanced, and the whole equipment has larger operation elasticity;
6. the whole set of equipment has compact structure, small occupied area and simple and smooth layout, and represents the development direction of large-scale complete evaporation equipment;
7. continuous feeding and discharging, and automatic control of the liquid level and the required concentration of the feed liquid can be realized
Type and throughput of forced circulation evaporator:
single-effect forced circulation evaporator: moisture evaporation (L/h): 1000. 1500, 2000;
double-effect forced circulation evaporator: moisture evaporation (L/h): 4000. 5000, 8000;
three-effect forced circulation evaporator: moisture evaporation (L/h): 6000. 8000, 12000, 15000, 18000, 36000;
the following table is a comparison of the data in example 1 and comparative example
According to comparison, the falling film evaporator in the mechanical vapor compression system in tomato sauce processing is a film evaporator, the material in the equipment is small in volume, high in flow speed, short in residence time and short in heating time, energy consumption is low, the falling film evaporator is suitable for concentrating heat-sensitive materials, in tomato sauce processing, the mechanical vapor compression system in tomato sauce processing is applied to the tomato sauce processing, the tomato juice raw material liquid filled in the second preheater is conveyed to the top of the first heating evaporator through the first feeding pipe along with the continuous operation of the first feeding pump, film-like falling is formed along the inner wall of the pipe under the action of gravity and is evaporated, concentrated liquid enters the first evaporation separation chamber from the bottom and is discharged from the bottom, secondary steam overflows from the top, the concentrated liquid enters the second evaporation separation chamber from the bottom of the second heating pump and is discharged from the bottom, evaporation concentration of juice is realized, the quality of the tomato juice is easy to climb up from the first heating film evaporator to the top and the second heating film evaporator is not easy to be influenced, the quality of the tomato juice is difficult to be heated up from the top to the first heating film evaporator, and the quality of the tomato juice is difficult to be heated up from the first heating film evaporator. Meanwhile, when the mechanical vapor compression system is applied to tomato sauce processing, compared with the prior art, tomato juice in a raw material tank is pumped to a first preheater through a first feed pump and then is conveyed into a second preheater, so that the tomato juice is preheated, the flow of a material circulating pump is greatly reduced, the power consumption of the material circulating pump is reduced, and a remarkable technical effect is achieved.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. The mechanical vapor compression system in tomato sauce processing is characterized by comprising a raw material tank (1), wherein a first feed pump (2) is installed at the discharge end of the raw material tank (1) through pipeline communication, a first preheater (3) is installed at the first feed pump (2) through pipeline communication, a second preheater (4) is installed at the first preheater (3) through pipeline communication, and an evaporation plant (5) is installed at the discharge end of the second preheater (4) through pipeline communication.
2. Mechanical vapor compression system in tomato sauce processing according to claim 1, characterized in that the evaporation device (5) comprises a first feed pipe (6), a first heating evaporator (7), a first evaporation separation chamber (8), a second feed pump (9), a second feed pipe (10), a second heating evaporator (11) and a second evaporation separation chamber (12), wherein the first feed pipe (6) is fixedly arranged at the discharge end of the second preheater (4), the first heating evaporator (7) is arranged at the end of the first feed pipe (6) far away from the second preheater (4) in a communicating manner, the end of the first feed pipe (6) far away from the second preheater (4) is communicated with the top of the first heating evaporator (7), the first evaporation separation chamber (8) is arranged at the bottom discharge end of the first heating evaporator (7), the second feed pump (9) is arranged at the end of the first evaporation separation chamber (8) far away from the first heating evaporator (7) in a communicating manner through a pipeline, the first feed pipe (9) is arranged at the end of the second feed pipe (9) far away from the second evaporator (10) in a communicating manner, the bottom of the second heating evaporator (11) is provided with a second evaporation separation chamber (12) through a pipeline.
3. Mechanical vapor compression system in tomato sauce processing according to claim 2, characterized in that the first and second evaporation separation chambers (8, 12) are internally provided with a baffled, swirl-type parallel tortuous path demister.
4. A mechanical vapor compression system in tomato sauce processing according to claim 3, wherein the upper ends of the first and second evaporation separation chambers (8, 12) are glass fiber dip fluorosilicone oil candle mist eliminator.
5. Mechanical vapor compression system in tomato sauce processing according to claim 2, characterized in that the first (7) and second (11) heating evaporators are each internally mounted with a film distributor.
6. Mechanical vapor compression system in tomato sauce processing according to claim 5, wherein the air outlets of the first heating evaporator (7) and the second heating evaporator (11) are connected by a pipe and are provided with a vapor compressor.
7. Mechanical vapor compression system in tomato sauce processing according to claim 6, wherein the condensed water of the first (7) and second (11) heating evaporators is arranged in communication with a condensed water tank via a pipe.
8. Mechanical vapor compression system in tomato sauce processing according to claim 7, characterized in that the first (7) and second (11) heating evaporators are internally mounted with high efficiency demisters.
9. Mechanical vapor compression system in tomato sauce processing according to claim 8, wherein a gas collecting space is provided at the gas outlet ends of the first (7) and second (11) heating evaporators.
10. Use of a mechanical vapour compression system according to any of claims 1 to 9 in the production of tomato paste, comprising the following steps:
s1, delivering tomato juice with the concentration of 4.5-5% in a raw material tank (1) to a first preheater (3) through a first feed pump (2), setting the vacuum degree of-54 Kpa at the temperature of 70 ℃, concentrating the tomato juice with the concentration of about 5.2-5.5%, and then delivering the tomato juice into a second preheater (4), wherein the second preheater (4) is set with the vacuum degree of-67 Kpa at the temperature of 78 ℃ and concentrating the tomato juice with the concentration of about 8-8.5%, so as to preheat the tomato juice;
s2, along with continuous operation of the first feeding pump (2), tomato juice raw material liquid filled out of the second preheater (4) is sequentially conveyed to the tops of the first heating evaporator (7) and the second heating evaporator (11), the discharge concentration of tomato juice is about 37%, and then tomato paste with the concentration of about 37% is stored in a finished product storage tank through a pipeline, so that production of tomato paste is realized.
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| CN202310438584.XA CN116531779A (en) | 2023-04-19 | 2023-04-19 | Application of mechanical vapor compression system in tomato sauce processing |
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