WO2022151633A1

WO2022151633A1 - Wort thin film enhanced mass transfer boiling system and low-heat load boiling process thereof

Info

Publication number: WO2022151633A1
Application number: PCT/CN2021/097261
Authority: WO
Inventors: 戴晓勇; 李占勇; 徐庆; 张帆; 李彦华; 吴畏
Original assignee: 天津科技大学
Priority date: 2021-01-14
Filing date: 2021-05-31
Publication date: 2022-07-21
Also published as: CN112608801B; CN112608801A

Abstract

A wort thin film enhanced mass transfer boiling system, comprising a boiling precipitation tank pot body, a centrifugal film formation enhanced mass transfer device, a steam inlet pipeline system, a steam outlet pipeline system, a first variable-frequency material pump, a second variable-frequency material pump, a wort cooling system, and a CIP system. A boiling process using the system comprises the steps of feeding, heat preservation, heating to boiling, vacuum evaporation after boiling, vacuum flash evaporation, and the like.

Description

A wort film enhanced mass transfer boiling system and its low heat load boiling process

technical field

The invention belongs to the technical field of a wort boiling system in a beer brewing process and its technology, in particular to a wort film enhanced mass transfer boiling system with high efficiency mass transfer with secondary steam in a wort turbulent film state, and the use of the system Post low heat load boiling process.

Background technique

The brewing process of beer is mainly divided into the wort preparation process in the hot section and the wort fermentation process in the cold section. The wort preparation process is further divided into unit operations such as saccharification, filtration, boiling and cyclone precipitation. The Boiling stage is the most energy-intensive unit operation in beer brewing.

The wort must be boiled by a boiling system before it is oxygenated and used by yeast cells as a nutrient solution for alcoholic fermentation. Wort boiling is a complex process in which extensive chemical, physical, physicochemical and biochemical reactions take place. Its main purposes are: extraction and isomerization of hop components, formation of thermal coagulum, formation of stable wort by sterilization of wort and inactivation of residual enzymes, Maillard reaction, formation of some colors components, removal of unwanted volatile aroma compounds, pH reduction and water evaporation, etc. In this process: boiling intensity is the main means to affect the flavor of wort, and the evaluation of thermal separation effect is mostly based on the concentration of aroma compound dimethyl sulfide (DMS); Heat load, resulting in the increase of its carbonyl compounds [indicated by the thiobarbituric acid (TBA) value], which in turn causes the beer to age too quickly.

The wort boiling unit undergoes classic atmospheric boiling (total evaporation rate 8-12% and even higher), high pressure boiling (total evaporation rate 6-8%), low pressure boiling (total evaporation rate 6-7%), low pressure dynamic Boiling (total evaporation rate is 5%, which is the common form of wort boiling in beer brewing at this stage) and low heat load boiling (by means of vacuum flashing, stripping and other means to further reduce heat load), reducing primary energy consumption (low heat load) is the wort. The main pursuit of the evolution of boiling methods. Studies have shown that: in the wort boiling process, most of the reactions are only related to time and temperature, such as: inactivation of enzymes, sterilization of wort, extraction and isomerization of hop compounds, coagulation of proteins, pH reduction, Reduction and formation of aromatic compounds etc. All these reactions do not require evaporation, simply keeping the hot wort around the boiling point is sufficient to ensure these reactions take place. In this process, how to complete the DMS separation under the condition of low total evaporation (below 1%, this method ensures low heat load, and ensures the balance of beer and good foam stability) is in front of us Problem; in the wort swirl precipitation stage after boiling, since the wort continues to maintain high temperature, SMM (methylmethionine) in the wort can continue to be decomposed into DMS, resulting in an increase in the DMS content in the wort after boiling, so the completion After the efficient separation of the DMS formed in the boiling stage, how to quickly remove the DMS produced in the wort precipitation stage in the same system also poses new challenges for the new separation device.

For example, a Chinese invention patent "Saccharification Boiling Pot and Beer Saccharification Device Using the Pot" with the patent number of ZL200910223168.8 (announcement number of CN101709249) discloses such a wort boiling pot, which is characterized in that the bottom of the pot is protruding upwards The convex bottom is provided with a steam heating jacket, a wort inlet pipe passes through the middle of the convex bottom and opens into the pot body, and the opening is upward, and a wort distribution plate is buckled upside down above the opening. There is a gap for the wort to flow out between the distribution plate and the opening. When boiling, the wort flows in the form of a film on the jacket, and the evaporation area is huge, which is conducive to the evaporation of unfavorable taste substances. The disadvantages of this device are: in the boiling stage, the secondary steam cannot carry out effective mass transfer with the wort film, and the heat load is high; due to its special structure, it cannot be vacuum flashed; the boiled wort cannot be vacuum flashed. As a result, the temperature is lowered, which in turn reduces the heat load in the precipitation stage.

For example, another Chinese invention patent No. ZL200610050478.0 (announcement No. CN100398635C) discloses such a wort boiling system, which is characterized in that a vacuum chamber is arranged behind the sedimentation tank, and the vacuum chamber Connected to the vacuum pump, the wort is subjected to vacuum flash evaporation when it passes through the vacuum chamber, which can effectively remove the DMS produced by SMM in the wort at high temperature during the precipitation stage, but because of the denaturation of protein and the isomerization of hop components, it needs to be at the boiling point of the wort. It can only be achieved by reaching a specific time at a temperature of about 100%, and its description of shortening the boiling time is open to question. The disadvantages of this system are: no effective mass transfer with secondary steam; additional vacuum chambers and auxiliary systems need to be added; the DMS formed in the boiling stage cannot be removed in time, and the heat load in the boiling stage is high; Vacuum flashing of the juice results in a reduction in temperature, which in turn reduces the heat load in the precipitation stage.

In the end, changing the traditional strong boiling and adopting the method of keeping the temperature slightly lower than the boiling point to realize the boiling stage further reduces the primary energy consumption, thereby reducing the heat load and improving the quality of the wort, which has become the research direction of the new wort boiling system; The traditional boiling method, intensifying the mass transfer of DMS and secondary steam with evaporation of less than 1% due to primary energy consumption, is the best choice to achieve effective separation of DMS.

SUMMARY OF THE INVENTION

The purpose of the present invention is to aim at the deficiencies of the above-mentioned prior art, and propose a wort film enhanced mass transfer boiling system, which realizes secondary steam in the wort through the combination of the boiling sedimentation tank body and the centrifugal film forming enhanced mass transfer device. High-efficiency mass transfer with DMS on the turbulent membrane (high-efficiency removal of DMS), during boiling, the secondary steam generated by boiling is carried out on the surface of the turbulent membrane for high-efficiency mass transfer at atmospheric pressure to remove DMS; after boiling, the secondary steam generated by vacuum flash evaporation Efficient mass transfer on the surface of the turbulent membrane removes the DMS formed in the boiling stage, and at the same time, the temperature of the wort before precipitation can be reduced, thereby reducing the heat load and TBA value in the precipitation stage; after the precipitation, the secondary steam generated by the vacuum flash is on the surface of the turbulent membrane. Efficient mass transfer to remove DMS formed in the precipitation stage, and at the same time, it can reduce the temperature of the wort before cooling, thereby reducing the heat load in the cooling stage, thereby reducing the TBA value, and saving the energy consumed by cooling the wort; the entire boiling process can be at a temperature lower than the boiling point. Insulation, the evaporation is less than 1%, which greatly reduces the primary energy consumption and heat load, and then reduces the TBA value.

The purpose of the invention is also to provide a low heat load boiling process of a wort film enhanced mass transfer boiling system, which abandons the traditional intensive boiling, and adopts a low heat load boiling process with a temperature slightly lower than the boiling point temperature to achieve DMS and secondary steam. High-efficiency mass transfer in wort turbulent film state, rapid and effective separation of DMS under the condition that primary energy consumption brings evaporation less than 1%, it has extremely low primary energy consumption, so the heat load in the boiling stage is low, and the wort in the wort The resulting aging substances at least eliminate the advantage of premature aging of the beer.

The present invention solves its technical problem and realizes through the following technical solutions:

A wort film enhanced mass transfer boiling system, which comprises a boiling sedimentation tank body, a centrifugal film forming enhanced mass transfer device, a steam inlet pipeline system, a steam outlet pipeline system, a No. 1 variable frequency material pump, and a No. 2 variable frequency material pump , wort cooling system and CIP system, the centrifugal film-forming enhanced mass transfer device is located at the top of the boiling settling tank, through the fourteenth pneumatic butterfly valve and the secondary steam outlet set at the top of the boiling settling tank from the side. The rotating shaft passes through the center of the secondary steam outlet through the mechanical seal to reach the bottom of the boiling sedimentation tank and is equipped with a stirring device; the steam inlet pipeline is connected to the bottom of the centrifugal film-forming enhanced mass transfer device through three branches, respectively. The steam jacket of the film-forming device is connected with the steam jacket inlet of the boiler body of the boiling sedimentation tank and the conical bottom. The steam jacket of the film-forming device is connected to the outlet of the steam jacket on the bottom of the boiling sedimentation tank. The fifth pneumatic butterfly valve is connected with the second outlet and the first outlet arranged at the bottom of the boiling sedimentation tank, and the wort outlet arranged at the bottom of the centrifugal film-forming intensified mass transfer device; Eight pneumatic butterfly valves are connected with the wort return port, the tangential inlet and the hot wort inlet on the wort cooling system arranged on the barrel of the boiling sedimentation tank; The pneumatic butterfly valve, the second pneumatic butterfly valve are connected with the outlet 2 arranged on the bottom of the boiler of the boiling sedimentation tank and the outlet 3 arranged on the barrel of the boiling sedimentation tank, and the outlet is connected with the cloth arranged on the top of the centrifugal film-forming enhanced mass transfer device. connected to the inlet of the liquid system.

Moreover, the centrifugal film-forming enhanced mass transfer device is provided with a film-forming device housing, a liquid level switch 4, a mechanical seal, a rotating shaft, a frequency conversion motor, a pressure sensor, a wort buffer tube, a film-forming device wort outlet and a liquid distribution The device, wherein a gravity field diaphragm is fixed on the shell of the film forming device, a centrifugal force field diaphragm is fixed on the rotating shaft, and an indefinite number of spoilers are also arranged on the centrifugal force field diaphragm, and the bottom of the wort buffer tube passes through the fourteenth The pneumatic butterfly valve is connected, and the bottom and the secondary steam outlet are separated by a mechanical seal. The wort buffer cylinder and the conical bottom of the film-forming device shell are provided with a film-forming device steam jacket, which is used to generate a small amount of secondary steam and form a film. The top of the device shell is connected to the inlet of the vacuum pump, the outlet of the vacuum pump goes to the energy recovery system, and the centrifugal film-forming enhanced mass transfer device is a vacuum chamber.

Moreover, the secondary steam outlet at the top of the boiler body of the boiling sedimentation tank is connected to the secondary steam exhaust cylinder, the gas discharge is controlled by the thirteenth pneumatic butterfly valve, and the secondary steam outlet is strengthened by the fourteenth pneumatic butterfly valve and centrifugal film forming. The mass transfer device is connected from the side, and the barrel of the boiling sedimentation tank is provided with a temperature sensor, a liquid level sensor, a barrel jacket, an outlet three, a wort return port and a tangential inlet; the cone of the boiling sedimentation tank is provided with The bottom is provided with a steam jacket and a thermal coagulation collection device, wherein the thermal coagulation collection device also includes an outlet 2, an outlet 1 and a liquid level switch 1, and the outlet 1 is provided with a wort feeding pipeline through the tenth pneumatic butterfly valve. ; The center is provided with a stirring device for strengthening the collision and agglomeration of thermal coagulation, and it shares a rotating shaft and a frequency conversion motor with the centrifugal film-forming enhanced mass transfer device.

Moreover, the wort cooling system includes a plate heat exchanger, the plate heat exchanger is provided with an ice water inlet, a hot water outlet, a hot wort inlet and a cold wort outlet, and the ice water inlet is provided with a bimetallic A thermometer and a pneumatic regulating valve; a bimetallic thermometer and a fifteenth pneumatic butterfly valve are arranged on the hot water outlet; a bimetallic thermometer is arranged at the hot wort inlet and is connected to the outlet of the No. 1 frequency conversion material pump through a pneumatic butterfly valve; the cold wort outlet is arranged with a bimetallic thermometer Bimetal thermometer and go through the sixteenth pneumatic butterfly valve to the wort oxygenation device.

Moreover, in the CIP system, the inlet main pipe is provided with two branches, one of which passes through the twelfth pneumatic butterfly valve and the washing ball to clean the secondary steam exhaust cylinder, and the other branch passes through the eleventh pneumatic butterfly valve and the washing ball. Ball cleaning and boiling sedimentation tank pot body; CIP cleaning liquid returns to CIP system through outlet one and ninth pneumatic butterfly valve.

A low heat load boiling process utilizing the wort film to enhance mass transfer boiling system, which comprises the following steps:

(1) Feeding: the temperature at which the wort enters the boiling settling tank body is 98 °C, if the feeding temperature is insufficient, the steam heating system can be set outside the system to heat up to 98 °C;

(2) Insulation stage: to maintain constant temperature instead of high-intensity boiling, set the insulation temperature of the boiling sedimentation tank to 98 °C, the upper limit is 98.5 °C, and the lower limit is 97.5 °C, the steam heating system is used to maintain a constant temperature, and the wort is self-boiling The precipitation tank body is pumped into the centrifugal film-forming and enhanced mass transfer device, and the top of the centrifugal film-forming device is opened, and the steam jacket of the film-forming device is opened to generate a small amount of secondary steam. During the wort turbulent flow film, the DMS and the secondary steam carry out efficient mass transfer, and the DMS content in the secondary steam will become higher and higher. During the heat preservation period, because the temperature is lower than the boiling point of the wort, the total evaporation is less than 1%, and the heat preservation The time is 50-60 minutes;

(3) Heating to boiling: Boil the wort in the precipitation tank and heat it to boiling and keep heating continuously, and pump the wort into the centrifugal film-forming intensified mass transfer device to form a centrifugal film, and boil the secondary produced in the precipitation tank. The steam passes through the centrifugal film formation in turn to strengthen the centrifugal force field diaphragm in the mass transfer device and the wort turbulence film on the gravity field diaphragm. During this period, the DMS and the secondary steam perform efficient mass transfer, and the DMS content in the secondary steam will increase. High, timing 10-15 minutes, total evaporation is 0.5-0.7%;

(4) Vacuum evaporation after boiling: control the internal gauge pressure of the centrifugal film-forming intensified mass transfer device to be about -0.4bar by a vacuum pump, and pump the wort into the centrifugal film-forming intensified mass transfer device top to form a centrifugal film, and the wort in the vacuum chamber Vigorous boiling in the film state is conducive to the separation and discharge of DMS. At the same time, the secondary steam generated by boiling in the pot of the precipitation tank will enhance mass transfer on the surface of the wort turbulent membrane, and the DMS content in the secondary steam will become higher and higher. When the material temperature will drop to about 86-90 ℃, the low temperature at this stage is conducive to reducing the decomposition of SMM into DMS in the precipitation stage, and is conducive to the addition of aroma hops, reducing the volatilization loss of hop essential oil, and can reduce the heat in the precipitation stage. load, and then reduce the TBA value;

(5) The DMS formed in the precipitation stage is further removed by vacuum flashing before cooling after wort precipitation:

The inner surface pressure of the centrifugal film-forming enhanced mass transfer device is controlled by a vacuum pump to be about -0.8 bar, and the wort is pumped into the top of the centrifugal film-forming enhanced mass transfer device to form a centrifugal film. It is conducive to the separation and discharge of DMS, and at the same time, the secondary steam generated by boiling will enhance mass transfer on the surface of the wort turbulent membrane. The energy consumption of the wort; the total evaporation from steps (4) and (5) by vacuum flashing in a turbulent film state is 6-8%.

The advantages and beneficial effects of the present invention are:

1. The wort film-enhanced mass transfer boiling system of the present invention realizes high-efficiency mass transfer between secondary steam and DMS on the wort turbulent film by the combination of the boiling precipitation tank body and the centrifugal film-forming enhanced mass transfer device (efficient removal of DMS). ), during the boiling, the secondary steam generated by boiling is carried out on the surface of the turbulent membrane for efficient mass transfer at atmospheric pressure to remove DMS; after boiling, the secondary steam generated by vacuum flashing is subjected to efficient mass transfer on the surface of the turbulent membrane to remove DMS formed in the boiling stage. DMS, at the same time, can reduce the wort temperature before precipitation, thereby reducing the heat load and TBA value in the precipitation stage; after the precipitation, the secondary steam generated by the vacuum flashing will perform efficient mass transfer on the surface of the turbulent membrane to remove the DMS formed in the precipitation stage, and at the same time, the DMS formed in the precipitation stage can be removed. Reduce the temperature of the wort before cooling, thereby reducing the heat load in the cooling stage, thereby reducing the TBA value, and saving the energy consumed by cooling the wort; the entire boiling process can be kept at a temperature lower than the boiling point, and the evaporation is less than 1%, which greatly reduces the primary energy. consumption and thermal load, which in turn reduces the TBA value.

2. In the wort film enhanced mass transfer and boiling system of the present invention, a gravitational field diaphragm is fixed on the shell of the film-forming device, a centrifugal force field diaphragm is fixed on the rotating shaft, and an indefinite number of turbulence is also arranged on the centrifugal force field diaphragm The bottom of the wort buffer cylinder is connected by a fourteenth pneumatic butterfly valve, and the bottom and the secondary steam outlet are separated by a mechanical seal. The wort buffer cylinder and the cone bottom of the film-forming device shell are provided with a film-forming device steam jacket. , used to generate a small amount of secondary steam. The top of the film-forming device shell is connected to the inlet of the vacuum pump, the outlet of the vacuum pump goes to the energy recovery system, and the centrifugal film-forming enhanced mass transfer device is a vacuum chamber. After boiling, the secondary steam generated by the vacuum flash is in The high-efficiency mass transfer on the surface of the turbulent membrane removes the DMS formed in the boiling stage, and at the same time, it can reduce the temperature of the wort before precipitation, thereby reducing the heat load and TBA value in the precipitation stage.

3. In the wort film-enhanced mass transfer boiling system of the present invention, the secondary steam outlet at the top of the boiler body of the boiling sedimentation tank is connected to the secondary steam exhaust cylinder, the gas discharge is controlled by the thirteenth pneumatic butterfly valve, and the secondary steam outlet passes through the third steam outlet. 14. The pneumatic butterfly valve and the centrifugal film-forming enhanced mass transfer device are connected from the side. The centrifugal film-forming enhanced mass transfer device shares the rotating shaft and the frequency conversion motor. High-efficiency communication of the secondary steam is realized, and the structure is simplified by sharing the rotating shaft and the frequency conversion motor, which is beneficial to control.

4. The low heat load boiling process of the wort film enhanced mass transfer boiling system of the present invention is different from the traditional boiling method: the traditional boiling method only separates DMS through the secondary steam through the large evaporation intensity; The secondary steam and wort carry out efficient mass transfer in the turbulent film state, and the secondary steam contains higher DMS, which reduces the demand for secondary steam, thus reducing the boiling intensity, saving primary energy consumption and reducing heat load.

5. The low heat load boiling process of the wort film enhanced mass transfer boiling system of the present invention can adopt the form of keeping the temperature below the boiling temperature in the boiling stage, abandoning the traditional intensive boiling, and realizing the cracking of SMM into DMS, protein denaturation and hop isomerization. The total evaporation rate during the period is less than 1%, and the generated DMS is efficiently removed by mass transfer on the surface of the turbulent membrane through the secondary steam generated by the vacuum flash after boiling, and at the same time, the temperature of the wort before precipitation can be reduced, thereby reducing the heat load and TBA value in the precipitation stage. , is also conducive to the addition of aroma hops at this stage (low temperature reduces hop essential oil volatilization).

6. The low heat load boiling process of the wort film enhanced mass transfer boiling system of the present invention appropriately increases the boiling intensity during boiling, so that the secondary steam generated by boiling can be efficiently removed by mass transfer on the surface of the wort turbulent film surface due to high temperature cracking by SMM The resulting DMS, reduced DMS concentration in the wort has an effect on SMM cleavage.

7. In the low heat load boiling process of the wort film enhanced mass transfer boiling system of the present invention, after the precipitation is completed, the secondary steam generated by the vacuum flashing is carried out on the surface of the turbulent film for efficient mass transfer to remove the DMS generated by the SMM cracking in the precipitation stage. At the same time, it can reduce the temperature of the wort before cooling, thereby reducing the heat load in the cooling stage, thereby reducing the TBA value, and can save the energy consumed by cooling the wort.

8. The low heat load boiling process of the wort film enhanced mass transfer boiling system of the present invention can achieve vacuum flash evaporation of materials and film enhanced mass transfer in the boiling and precipitation stages, and it is completed in the same device, saving costs.

9. The low heat load boiling process of the wort film enhanced mass transfer boiling system of the present invention ensures low heat load and low TBA under the condition of low total evaporation (below 1%) brought about by the first energy consumption It is beneficial to avoid the premature aging taste of beer, and to ensure that the wort coagulability nitrogen is only slightly higher than that of traditional boiling, so that the beer has good balance and foam stability.

Description of drawings

Fig. 1 is the overall flow chart of the wort film enhanced mass transfer boiling system of the present invention;

Description of reference numerals

1-No. 2 variable frequency material pump, 2- No. 1 pneumatic butterfly valve, 3- No. 2 pneumatic butterfly valve, 4- No. 3 pneumatic butterfly valve, 5- No. 4 pneumatic butterfly valve, 6- No. 5 pneumatic butterfly valve, 7-No. 1 variable frequency material pump , 8- sixth pneumatic butterfly valve, 9- seventh pneumatic butterfly valve, 10- eighth pneumatic butterfly valve, 11- ninth pneumatic butterfly valve, 12- tenth pneumatic butterfly valve, 13- liquid level switch one, 14- outlet one, 15- Thermal coagulation collection device, 16-outlet 2, 17-cone bottom jacket, 18-stop valve 1, 19-pneumatic angle seat valve 1, 20-pneumatic angle seat valve 2, 21-stop valve 2, 22-outlet 3 , 23- liquid level switch 2, 24- temperature sensor 1, 25- stirring device, 26- boiling sedimentation tank body, 27- eleventh pneumatic butterfly valve, 28- ball washing, 29- washing ball, 30- twelfth Pneumatic butterfly valve, 31-vision light, 32-secondary steam outlet, 33-manhole, 34-thirteenth pneumatic butterfly valve, 35-fourteenth pneumatic butterfly valve, 36-secondary steam exhaust pipe, 37-wort buffer Cylinder, 38-liquid level switch 3, 39-secondary steam, 40-rotating shaft, 41-vacuum pump, 42-frequency conversion motor, 43-pressure sensor, 44-liquid distribution system, 45-centrifugal film-forming enhanced mass transfer device, 46-film-forming device shell, 47-mechanical seal, 48-pressure gauge, 49-film-forming device wort outlet, 50-gravity field diaphragm, 51-centrifugal force field diaphragm, 52-spoiler, 53-liquid Position switch three, 54-fifteenth pneumatic butterfly valve, 55-pneumatic regulating valve, 56-57-bimetal thermometer, 58-plate heat exchanger, 59-temperature sensor two, 60-61-bimetal thermometer, 62-th Sixteen pneumatic butterfly valve, 63-filter, 64-trap valve, 65-check valve, 66-filter, 67-trap valve, 68-check valve, 69-tangential inlet, 70-wort return port, 71 - Steam inlet piping system, 72- Condensate water outlet piping system, 73- Wort cooling system, 74- CIP system, 75- Cylinder jacket, 76- Liquid level switch 5, 77- Seventeenth pneumatic butterfly valve, 78-18th pneumatic butterfly valve, 79-mechanical seal, 80-filter, 81-trap valve, 82-check valve, 83-pneumatic angle seat valve 2, 84-stop valve 2, 85-film forming device steam clamp set.

Detailed ways

The present invention will be further described in detail below through specific examples. The following examples are only descriptive, not restrictive, and cannot limit the protection scope of the present invention.

A wort film enhanced mass transfer boiling system, including a boiling sedimentation tank body 26, a centrifugal film forming enhanced mass transfer device 45, a steam inlet pipeline system 71, a steam outlet pipeline system 72, a No. 1 variable frequency material pump 7, a second Number of frequency conversion material pump 1, wort cooling system 73 and CIP system 74.

The centrifugal film-forming enhanced mass transfer device 45 is provided with a film-forming device housing 46, a liquid level switch four 38, a mechanical seal 47, a rotating shaft 40, a variable frequency motor 42, a pressure sensor 43, a wort buffer tube 37, an outlet 49 and a liquid cloth device 44. A gravity field diaphragm 50 is fixed on the casing, a centrifugal force field diaphragm 51 is fixed on the rotating shaft 40 , and an indefinite number of spoilers 52 are also arranged on the centrifugal force field diaphragm 51 . The bottom of the wort buffer cylinder 37 is communicated with the secondary steam outlet 32 from the side through the fourteenth pneumatic butterfly valve 35 , and the bottom and the secondary steam outlet 32 are separated by a mechanical seal 79 . The wort buffer cylinder 37 and the film-forming device casing 46 are provided with a film-forming device steam jacket 85 on the conical bottom for generating a small amount of secondary steam. The top of the housing 46 is connected to the inlet of the vacuum pump 41, and the outlet of the vacuum pump 41 goes to the energy recovery system.

The top of the boiler body 26 of the boiling sedimentation tank is provided with a secondary steam outlet 32, a visual lamp 31 and a manhole 33, wherein the secondary steam outlet 32 is respectively connected with the secondary steam exhaust cylinder 36, and the gas discharge is controlled by thirteen pneumatic butterfly valves 34, The fourteenth pneumatic butterfly valve 35 is communicated with the centrifugal film-forming enhanced mass transfer device 45 from the side; the boiler body 26 of the boiling sedimentation tank is provided with a temperature sensor 24, a liquid level sensor 23, a cylinder jacket 75, an outlet three 22. The wort return port 70 and the tangential inlet 69; the conical bottom of the pot body 26 of the boiling sedimentation tank is provided with a steam jacket 17 and a thermal coagulation collection device 15, wherein the thermal coagulation collection device 15 also includes outlet two 16, Outlet one 14 and liquid level switch one 13; the center of the boiler body 26 of the boiling sedimentation tank is provided with a stirring device 25 for strengthening the collision and agglomeration of the thermal coagulation, and the stirring device and the centrifugal film-forming enhanced mass transfer device 45 use the same frequency conversion motor 42 and rotating shaft 40; The outlet one 14 sets the wort feeding pipeline through the tenth pneumatic butterfly valve 12.

The steam inlet pipeline 71 is provided with a pressure gauge 48 on the main line, and is then provided with three branches, one of which is connected to the inlet of the steam jacket 85 of the above-mentioned film-forming device through a stop valve 84 and a pneumatic angle seat valve 83, and one branch is connected through a stop valve. 21 and the pneumatic angle seat valve 20 are connected to the inlet of the above-mentioned cylinder jacket 75, and the other branch is connected to the inlet of the above-mentioned cone jacket 17 through the stop valve 18 and the pneumatic angle seat valve 20.

The steam outlet pipeline 72 is provided with three branches on the main line, one branch is connected to the outlet of the steam jacket 85 of the above-mentioned film-forming device through the filter 80, the steam trap 81 and the check valve 82, and the other branch passes through the filter 63, the steam trap 64 and the check valve 65 are connected to the above-mentioned outlet of the cylinder jacket 75 , and the other branch is connected to the above-mentioned outlet of the steam jacket 17 through a filter 68 , a steam trap 67 and a check valve 66 .

The inlet of No. 1 variable frequency material pump 7 is connected with the above-mentioned outlet two 16, one outlet 14 and the wort outlet 49 of the film-forming device through the third pneumatic butterfly valve 4, the fourth pneumatic butterfly valve 5, the fifth pneumatic butterfly valve 6 respectively; The outlet of the pump 7 is connected to the above-mentioned wort return port 70 , the tangential inlet 69 and the inlet of the wort cooling system 73 through the sixth pneumatic butterfly valve 8 , the seventh pneumatic butterfly valve 9 , and the eighth pneumatic butterfly valve 10 respectively.

The inlet of No. 2 variable frequency material pump 1 is connected to the above-mentioned outlet 2 16 and outlet 3 22 through the first pneumatic butterfly valve 2 and the second pneumatic butterfly valve 3 respectively; the outlet of No. 2 variable frequency material pump 1 is connected to the above-mentioned liquid distribution system inlet.

The main body of the wort cooling system 73 is a plate heat exchanger 58, and the plate heat exchanger 58 is provided with an ice water inlet, a hot water outlet, a hot wort inlet and a cold wort outlet. The ice water inlet is provided with a bimetal thermometer 57 and a pneumatic regulating valve 55; the hot water outlet is provided with a bimetal thermometer 56 and a pneumatic butterfly valve 54; the hot wort inlet is provided with a bimetal thermometer 61, which is connected to the above-mentioned pneumatic butterfly valve 10 through the above-mentioned pneumatic butterfly valve 10. The No. 1 frequency conversion material pump 7 is connected to the outlet; the cold wort outlet is provided with a bimetal thermometer 60 and the wort oxygenation device is passed through the sixteenth pneumatic butterfly valve 62.

The inlet main pipe of the CIP system 74 is provided with two branches, one of which cleans the secondary steam exhaust cylinder 36 through the pneumatic butterfly valve 30 and the washing ball 29, and the other branch cleans the boiling and sedimentation tank body through the pneumatic butterfly valve 27 and the washing ball 28 26; The CIP cleaning fluid is returned to the CIP system through the above-mentioned outlet 14 and the pneumatic butterfly valve 11.

The low heat load boiling process of the wort film enhanced mass transfer boiling system of the present invention comprises the following steps:

(1) Feeding:

Open the tenth pneumatic butterfly valve 12, the wort enters the boiling and sedimentation tank body, and the preheating temperature of the wort is 98°C. If the feed temperature is insufficient, the steam heating system set outside the system can be used to heat up to 98°C;

If the wort has not been preheated or is less than 98°C after preheating, when the wort covers the steam jacket 17 during feeding, first open the stop valve 18 and the pneumatic angle seat valve 19 to heat the wort first. When the feeding is completed, the stop valve 21 and the pneumatic angle seat valve 20 are opened again. During this period, the temperature sensor-24 and the PLC control the switches of the pneumatic angle seat valve 19 and the pneumatic angle seat valve 20. When the temperature reaches 98°C, the pneumatic angle seat valve is automatically closed. seat valve 19, pneumatic angle seat valve 20, and automatically enter the next process;

The specific operation is: control the switches of the pneumatic angle seat valve 19 and the pneumatic angle seat valve 20 through the PLC and the temperature sensor 1 24, open at a low temperature of 97.5 °C, and close at a high temperature of 98.5 °C. Period: 1) open the second pneumatic butterfly valve 3 and the second variable frequency material pump 1; 2) open the vacuum pump 41, the fourteenth pneumatic butterfly valve 35, and control the gauge pressure in the tank to 0 bar through the pressure sensor 43 and PLC; 3) open the first Fourteen pneumatic butterfly valve 35; 4) Open stop valve 84 and pneumatic angle seat valve 83; 5) Open frequency conversion motor 42, and set the frequency to about 560 rpm. Through the liquid distribution system 44, the wort is evenly distributed on the top of the gravity field diaphragm 50, and evenly flows to the bottom of the next layer of centrifugal force field diaphragm 51. Under the action of centrifugal force, the wort gradually moves along the centrifugal force field film in the form of a turbulent film. The surface of the sheet 51 rises to its top and falls to the top of the cone bottom of the shell 46, and forms a film along its wall surface, and forms a turbulent film under the disturbance of the wort film by the second spoiler 52; the film-forming device steam jacket A small amount of secondary steam 39 generated by 85 will enhance mass transfer through the wort turbulent membrane surface in the gap between the above-mentioned gravity field diaphragm and centrifugal force field diaphragm, and the DMS content in the secondary steam 39 will become higher and higher. During the period, the stirring device 25 strengthens the collision and agglomeration of the thermal coagulation, and reduces the problem of insufficient collision and agglomeration of the thermal coagulation due to low boiling strength and weak wort tumbling. During the heat preservation period, because the temperature is lower than the boiling point of the wort, the total evaporation during the period is below 1%, and the heat preservation time is 50 minutes (if the fourth step is not selected, the time is set to 60 minutes). 4).

(3) heating to boiling:

Boil the wort in the precipitation tank and heat it to boiling and keep heating continuously, and pump the wort into the centrifugal film-forming intensified mass transfer device to form a centrifugal film. The centrifugal force field membrane in the mass device and the wort turbulent membrane on the gravity field membrane surface, during which the DMS and the secondary steam carry out efficient mass transfer, and the DMS content in the secondary steam will be higher and higher, the time is 10-15 minutes, The total evaporation is 0.5-0.7%.

The specific process is: set the temperature to 100°C, and control the opening of the pneumatic angle seat valve 19 and the pneumatic angle seat valve 20 through PLC and temperature sensor 1 24 . After reaching 100°C (keep the pneumatic angle seat valve open continuously): 1) open the second pneumatic butterfly valve 3 and the second variable frequency material pump 1; 2) open the vacuum pump 41, the fourteenth pneumatic butterfly valve 35, and pass the pressure sensor 43 and PLC The gauge pressure in the control tank is 0bar; 3) Open the fifth pneumatic butterfly valve 6, the sixth pneumatic butterfly valve 8, and the No. 1 variable frequency material pump 7. During the period, when the liquid level is lower than the liquid level switch three 53, close the No. 1 variable frequency material pump 7, and the high Turn on the No. 1 variable frequency material pump 7 at 4 o'clock of the liquid level switch; 5) Turn on the variable frequency motor 42, and set the frequency to about 560 rpm. Through the liquid distribution system 44, the wort is evenly distributed on the top of the gravity field diaphragm 50, and evenly flows to the bottom of the next layer of centrifugal force field diaphragm 51. Under the action of centrifugal force, the wort gradually moves along the centrifugal force field film in the form of a turbulent film. The surface of the sheet 51 rises to its top and falls to the top of the cone bottom of the shell 46, and forms a film along its wall surface, and forms a turbulent film under the disturbance of the wort film by the second spoiler 52; the boiling sedimentation tank 26 is heated and boiled The secondary steam 39 generated at the time passes through the wort turbulent membrane surface in the gap between the above-mentioned gravity field diaphragm and centrifugal force field diaphragm to enhance mass transfer, and the DMS content in the secondary steam 39 will be higher and higher. Timing for 10 minutes, the total evaporation is about 0.6%, directly enter the next step after the time is up, and close all the open items.

(4) vacuum evaporation after boiling:

The inner surface pressure of the centrifugal film-forming enhanced mass transfer device is controlled by a vacuum pump to be about -0.4 bar, and the wort is pumped into the top of the centrifugal film-forming enhanced mass transfer device to form a centrifugal film. It is conducive to the separation and discharge of DMS, and at the same time, the secondary steam produced by boiling in the pot of the sedimentation tank will enhance mass transfer on the surface of the wort turbulent membrane. The content of DMS in the secondary steam will be higher and higher, and the final material temperature will drop to 86-90 When the temperature is around ℃, the low temperature at this stage is beneficial to reduce the decomposition of SMM into DMS in the precipitation stage, and is conducive to the addition of aroma hops, reducing the volatilization loss of hop essential oil, and reducing the heat load in the precipitation stage, thereby reducing the TBA value.

The specific process is: 1) open the second pneumatic butterfly valve 3 and the second variable frequency material pump 1; 2) open the vacuum pump 41, the fourteenth pneumatic butterfly valve 35, and through the pressure sensor 43 and the PLC control device, the gauge pressure is about -0.4bar 3) Open the fifth pneumatic butterfly valve 6, the sixth pneumatic butterfly valve 8, and the No. 1 variable frequency material pump 7. During the period, the No. 1 variable frequency material pump 7 is turned off when the liquid level is lower than the

liquid level switch

3 and 53, and the No. 1 variable frequency material pump 7 is turned on when the liquid level is higher than the liquid level switch. No. 1 frequency conversion material pump 7; 4) Turn on the frequency conversion motor 42, and set the frequency to a speed of about 560 rpm. Through the liquid distribution system 44, the wort is evenly distributed on the top of the gravity field diaphragm 50, and evenly flows to the bottom of the next layer of centrifugal force field diaphragm 51. Under the action of centrifugal force, the wort gradually moves along the centrifugal force field film in the form of a turbulent film. The surface of the sheet 51 rises to its top and falls to the top of the cone bottom of the film-forming device housing 46 and descends along its wall to form a film, and a turbulent film is formed under the disturbance of the wort film by the spoiler two 52; The secondary steam 39 enhances mass transfer through the wort turbulent membrane surface in the gap between the above-mentioned gravity field diaphragm and the centrifugal force field diaphragm, and the DMS content in the secondary steam 39 will be higher and higher. When the temperature in the tank will drop to about 88 ℃ (the low temperature at this stage is conducive to the addition of aroma hops, reduces the volatilization loss of hop essential oil, and can reduce the heat load in the precipitation stage, thereby reducing the TBA value), directly enter the lower temperature step, and close all open items.

(5) Swirl precipitation:

After the wort is precipitated and cooled, the DMS formed in the precipitation stage is removed by further vacuum flashing: open the third pneumatic butterfly valve 4, the seventh pneumatic butterfly valve 9, the No. 1 variable frequency material pump 7, time for 10 minutes, and swirl the wort through centrifugal force. Let the hot coagulation settle; turn off all open items after 10 minutes, continue to time for 20 minutes, and go directly to the next step after 20 minutes.

(6) The DMS formed in the precipitation stage is further removed by vacuum flashing before cooling after wort precipitation:

The inner surface pressure of the centrifugal film-forming enhanced mass transfer device is controlled by a vacuum pump to be about -0.8 bar, and the wort is pumped into the top of the centrifugal film-forming enhanced mass transfer device to form a centrifugal film. It is conducive to the separation and discharge of DMS, and at the same time, the secondary steam generated by boiling will enhance mass transfer on the surface of the wort turbulent membrane. Energy consumption of wort.

The specific process is: 1) open the first pneumatic butterfly valve 2, the second variable frequency material pump 1, close the pneumatic butterfly valve 2 and open the second pneumatic butterfly valve 3 when the liquid level drops to the liquid level switch 2 23; 2) open the vacuum pump 41, The fourteenth pneumatic butterfly valve 35, and through the pressure sensor 43 and the PLC control device, the gauge pressure is about -0.8 bar; 3) Open the fifth pneumatic butterfly valve 6, the seventh pneumatic butterfly valve 9, the eighth pneumatic butterfly valve 10, the No. 1 frequency conversion material Pump 7, when the liquid level is lower than the liquid level switch 3 53, turn off the No. 1 variable frequency material pump 7, and turn on the No. 1 variable frequency material pump 7 when the liquid level is higher than the liquid level switch 4. 4) Turn on the variable frequency motor 42, and set the frequency to its speed is about 560 rpm. Through the liquid distribution system 44, the wort is evenly distributed on the top of the gravity field diaphragm 50, and evenly flows to the bottom of the next layer of centrifugal force field diaphragm 51. Under the action of centrifugal force, the wort gradually moves along the centrifugal force field film in the form of a turbulent film. The surface of the sheet 51 rises to its top and falls to the top of the cone bottom of the film-forming device housing 46 and descends along its wall to form a film, and a turbulent film is formed under the disturbance of the wort film by the second spoiler sheet 52; The secondary steam 39 enhances mass transfer through the wort turbulent membrane surface in the gap between the above-mentioned gravity field diaphragm and centrifugal force field diaphragm, and the DMS content in the secondary steam 39 will be higher and higher. 5) Under this vacuum degree, the wort temperature will drop to about 63°C (compared to the traditional 100°C wort cooling, which saves energy, and can reduce the heat load of the wort in the cooling stage, thereby reducing the TBA value), start the pneumatic control valve 55 Cool the wort with the pneumatic butterfly valve 54, set the wort outlet temperature to 10°C, cool the wort with 3°C ice water, and use the temperature sensor II 59 to measure the wort outlet temperature, and control the pneumatic control valve through PLC. 55 degrees to control the wort outlet temperature, when the liquid level reaches the liquid level sensor 576, close all opening items; 6) Open the eighteenth pneumatic butterfly valve 78 and the sixteenth pneumatic butterfly valve 62 to top the wort in the pipeline. Sterile water, close and open after the top water is over, and go directly to the next step.

(7) CIP cleaning

Open the seventeenth pneumatic butterfly valve 77 for sewage discharge, and close the opening item when the liquid level reaches the liquid level switch one 13; open the pneumatic butterfly valve 30/27 for cleaning, during which you can open the No. And the device is cleaned; the cleaning liquid is returned to the CIP system by opening the ninth pneumatic butterfly valve 11.

Through vacuum flashing in a turbulent film state, vacuum evaporation after boiling in step (4) and vacuum flashing in step (6) wort precipitation before cooling to remove DMS formed in the precipitation stage, the total evaporation is about 7%. .

Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the invention and the appended claims Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

A wort film enhanced mass transfer boiling system, characterized in that it comprises a boiling sedimentation tank body (26), a centrifugal film forming enhanced mass transfer device (45), a steam inlet piping system (71), and a steam outlet piping system (72), the No. 1 frequency conversion material pump (7), the No. 2 frequency conversion material pump (1), the wort cooling system (73) and the CIP system (74), the centrifugal film-forming enhanced mass transfer device (45) is located at The top of the pot body (26) of the boiling sedimentation tank is communicated from the side with the secondary steam outlet (32) arranged on the top of the pot body (26) of the boiling sedimentation tank through the fourteenth pneumatic butterfly valve (35), and the rotating shaft (40) Passing through the center of the secondary steam outlet (32) through the mechanical seal to the bottom of the boiler body (26) of the boiling sedimentation tank, and a stirring device (25) is installed; the steam inlet pipeline (71) is connected to the centrifugal The film-forming device steam jacket (85) at the bottom of the film-forming enhanced mass transfer device (45), the boiler body (26) of the boiling precipitation tank and the steam jacket (17) on the bottom of the cone are connected to the inlet; the steam outlet The pipeline (72) is respectively connected with the steam jacket (85) of the film-forming device arranged at the bottom of the centrifugal film-forming enhanced mass transfer device (45) through three branches, the boiler body (26) of the boiling sedimentation tank and the steam jacket on the bottom of the cone. The outlet of the steam jacket (17) is connected to each other; the inlet of the No. 1 variable frequency material pump (7) passes through the third pneumatic butterfly valve (4), the fourth pneumatic butterfly valve (5), the fifth pneumatic butterfly valve (6) and the The second outlet (16) and the first outlet (14) arranged at the bottom of the pot body (26) of the boiling sedimentation tank are connected with the wort outlet (49) arranged at the bottom of the centrifugal film-forming enhanced mass transfer device (45); The sixth pneumatic butterfly valve (8), the seventh pneumatic butterfly valve (9), the eighth pneumatic butterfly valve (10), and the wort return port (70) and the tangential inlet (69) arranged on the barrel body of the boiling sedimentation tank (26) ) is connected with the hot wort inlet on the wort cooling system (73); the inlet of the No. 2 variable frequency material pump (1) is respectively connected to the first pneumatic butterfly valve (2), the second pneumatic butterfly valve (3) and the The second outlet (16) at the bottom of the boiler body (26) of the boiling sedimentation tank is connected with the third outlet (22) arranged on the cylinder body of the boiling sedimentation tank body (26), and the outlet is connected to the centrifugal film-forming enhanced mass transfer device. (45) The inlet of the liquid distribution system at the top is connected.
The wort film enhanced mass transfer boiling system according to claim 1, characterized in that: the centrifugal film forming enhanced mass transfer device (45) is provided with a film forming device shell (46), a liquid Position switch four (38), mechanical seal (47), rotating shaft (40), frequency conversion motor (42), pressure sensor (43), wort buffer cylinder (37), film-forming device wort outlet (49) and liquid distribution The device (44), wherein a gravitational field diaphragm (50) is fixed on the shell of the film forming device, a centrifugal force field diaphragm (51) is fixed on the rotating shaft (40), and an indeterminate diaphragm (51) is also provided on the centrifugal force field diaphragm (51). A number of spoilers (52), the bottom of the wort buffer cylinder (37) is connected through a fourteenth pneumatic butterfly valve (35), and the bottom of the wort buffer (37) is separated from the secondary steam outlet (32) by a mechanical seal (79). The buffer cylinder (37) and the conical bottom of the film-forming device casing (46) are provided with a film-forming device steam jacket (85) for generating a small amount of secondary steam. The top of the film-forming device casing (46) is connected to the vacuum pump (41). ) is connected to the inlet, the outlet of the vacuum pump (41) goes to the energy recovery system, and the centrifugal film-forming enhanced mass transfer device is a vacuum chamber.
A wort film enhanced mass transfer boiling system according to claim 1, characterized in that: the secondary steam outlet (32) at the top of the boiling sedimentation tank body (26) and the secondary steam exhaust cylinder ( 36) are connected, the gas discharge is controlled by the thirteenth pneumatic butterfly valve (34), the secondary steam outlet (32) is connected from the side through the fourteenth pneumatic butterfly valve (35) and the centrifugal film-forming enhanced mass transfer device (45), A temperature sensor (24), a liquid level sensor (23), a cylinder jacket (75), a third outlet (22), a wort return port (70) and a tangent are arranged on the cylinder of the boiler body (26) of the boiling sedimentation tank Inlet (69); a steam jacket (17) and a thermal coagulation collection device (15) are provided on the conical bottom of the boiling settling tank body (26), wherein the thermal coagulation collection device (15) also includes an outlet two. (16), outlet one (14) and liquid level switch one (13), wherein outlet one (1) 4 is provided with a wort feeding pipeline through the tenth pneumatic butterfly valve (11); the center of which is provided with enhanced thermal coagulation collision The agglomerated stirring device (25) shares the rotating shaft (40) and the variable frequency motor (42) with the centrifugal film-forming and mass transfer enhanced device (45).
A wort film enhanced mass transfer boiling system according to claim 1, characterized in that: the wort cooling system (73) comprises a plate heat exchanger (58), and the plate heat exchanger (58) is on the plate heat exchanger (58). An ice water inlet, a hot water outlet, a hot wort inlet and a cold wort outlet are provided, and a bimetallic thermometer (57) and a pneumatic regulating valve (55) are arranged on the ice water inlet; a bimetallic thermometer is arranged on the hot water outlet (56) and the fifteenth pneumatic butterfly valve (54); the hot wort inlet is provided with a bimetal thermometer (61) and is connected to the outlet of the No. 1 variable frequency material pump (7) through the pneumatic butterfly valve (10); the cold wort outlet is provided with a The bimetal thermometer (60) goes to the wort oxygenation device through the sixteenth pneumatic butterfly valve (62).
The wort film enhanced mass transfer boiling system according to claim 1, wherein the CIP system (74) is provided with two branches in its main inlet pipe, one of which passes through the twelfth pneumatic butterfly valve (30) and the washing ball (29) to clean the secondary steam exhaust pipe (36), and another branch through the eleventh pneumatic butterfly valve (27) and the washing ball (28) to clean the boiling sedimentation tank pot (26); CIP The cleaning fluid is returned to the CIP system through outlet one (14) and the ninth pneumatic butterfly valve (11).
A low heat load boiling process utilizing the wort film enhanced mass transfer boiling system according to claims 1-8, characterized in that: comprising the following steps:

(1) Feeding: the temperature at which the wort enters the boiling settling tank body is 98 °C, if the feeding temperature is insufficient, the steam heating system can be set outside the system to heat up to 98 °C;

(2) Insulation stage: to maintain constant temperature instead of high-intensity boiling, set the insulation temperature of the boiling sedimentation tank to 98 °C, the upper limit is 98.5 °C, and the lower limit is 97.5 °C, the steam heating system is used to maintain a constant temperature, and the wort is self-boiling The precipitation tank body is pumped into the centrifugal film-forming and enhanced mass transfer device, and the top of the centrifugal film-forming device is opened, and the steam jacket of the film-forming device is opened to generate a small amount of secondary steam. During the wort turbulent flow film, the DMS and the secondary steam carry out efficient mass transfer, and the DMS content in the secondary steam will become higher and higher. During the heat preservation period, because the temperature is lower than the boiling point of the wort, the total evaporation is less than 1%, and the heat preservation The time is 50-60 minutes;

(3) Heating to boiling: Boil the wort in the precipitation tank and heat it to boiling and keep heating continuously, and pump the wort into the centrifugal film-forming intensified mass transfer device to form a centrifugal film, and boil the secondary produced in the precipitation tank. The steam passes through the centrifugal film formation in turn to strengthen the centrifugal force field diaphragm in the mass transfer device and the wort turbulence film on the gravity field diaphragm. During this period, the DMS and the secondary steam perform efficient mass transfer, and the DMS content in the secondary steam will increase. High, timing 10-15 minutes, total evaporation is 0.5-0.7%;

(4) Vacuum evaporation after boiling: control the internal gauge pressure of the centrifugal film-forming intensified mass transfer device to be about -0.4bar by a vacuum pump, and pump the wort into the centrifugal film-forming intensified mass transfer device top to form a centrifugal film, and the wort in the vacuum chamber Vigorous boiling in the film state is conducive to the separation and discharge of DMS. At the same time, the secondary steam generated by boiling in the pot of the precipitation tank will enhance mass transfer on the surface of the wort turbulent membrane, and the DMS content in the secondary steam will become higher and higher. When the material temperature will drop to about 86-90 ℃, the low temperature at this stage is conducive to reducing the decomposition of SMM into DMS in the precipitation stage, and is conducive to the addition of aroma hops, reducing the volatilization loss of hop essential oil, and can reduce the heat in the precipitation stage. load, and then reduce the TBA value;

(5) The DMS formed in the precipitation stage is further removed by vacuum flashing before cooling after wort precipitation:

The inner surface pressure of the centrifugal film-forming enhanced mass transfer device is controlled by a vacuum pump to be about -0.8 bar, and the wort is pumped into the top of the centrifugal film-forming enhanced mass transfer device to form a centrifugal film. It is conducive to the separation and discharge of DMS, and at the same time, the secondary steam generated by boiling will enhance mass transfer on the surface of the wort turbulent membrane. The energy consumption of the wort; the total evaporation from steps (4) and (5) by vacuum flashing in a turbulent film state is 6-8%.