Quadruple-effect falling film evaporation device applied to production of concentrated milk
By adjusting the steam flow direction and temperature, the problem of steam temperature reduction in the falling film evaporator was solved, ensuring the evaporation effect of the after-effect heater and improving the quality of the concentrated milk product.
Patent Information
- Application Number
- CN202423149588.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-19
- Publication Date
- 2025-11-14
- Estimated Expiration
- 2034-12-19
AI Technical Summary
In the prior art, the steam cools down as it passes through the falling film evaporator, resulting in a lower temperature of the heating medium in the subsequent second-effect evaporator compared to the first-effect evaporator. This affects the evaporation effect of the subsequent evaporator, especially when the raw material flow rate is unstable, as the temperature change in the pre-effect separator is insufficient to meet the evaporation requirements of the subsequent heater.
By coordinating components such as the second three-way valve, the second diverter pipe, the first jump pipe, and the first check valve, the steam flow direction is adjusted so that some steam directly enters the third falling film evaporator. The second diverter pipe adds steam from the main steam pipe to the first gas guide pipe, thereby increasing the heating steam temperature of the second and third falling film evaporators and ensuring that the temperature of the pre-effect separator is sufficient for the use of the post-effect heater.
It enables convenient and flexible adjustment of steam temperature, compensates for insufficient temperature in the pre-effect separator, ensures smooth evaporation operation of the post-effect heater, and improves the quality of the concentrated milk product.
Smart Images
Figure CN223542453U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of four-effect falling film evaporators, specifically to a four-effect falling film evaporator device used in the production of concentrated milk. Background Technology
[0002] Concentrated milk production requires a four-effect falling film evaporator. In falling film evaporation, the feed liquid is added from the upper tube box of the heating chamber of the evaporator. Through a liquid distribution and film-forming device, it is evenly distributed into each heat exchange tube and flows down the inner wall of the tubes in a uniform film. During this flow, the liquid is heated and vaporized by the shell-side heating medium. The resulting vapor and liquid phase enter the separation chamber of the evaporator together. After thorough separation, the vapor enters the next effect evaporator as the heating medium, thus achieving multi-effect operation. The liquid phase is discharged from the separation chamber.
[0003] In existing technologies, the steam cools down as it passes through the falling film evaporator, resulting in a lower temperature of the heating medium in the subsequent second-effect evaporator compared to the first-effect evaporator. Furthermore, the boiling points of the subsequent effects are generally lower than those of the preceding effects. Therefore, even with the lower heating medium temperature, a certain degree of evaporation and concentration can still be achieved. However, due to factors such as the feed flow rate in the evaporator, the temperature change in the preceding effect separator will vary. In certain situations, the temperature drop in the preceding effect separator may be insufficient for evaporation operations in the subsequent effect heater. Utility Model Content
[0004] In view of the above problems, this application provides a four-effect falling film evaporator for the production of concentrated milk, which can make up for the insufficient temperature in the pre-effect separator to carry out evaporation operation in the post-effect heater, and the adjustment method is quick and convenient.
[0005] According to one aspect of the embodiments of this application, a four-effect falling film evaporator for producing concentrated milk is provided. The four-effect falling film evaporator for producing concentrated milk includes a first falling film evaporator, a second falling film evaporator, a third falling film evaporator, and a fourth falling film evaporator arranged sequentially. The first, second, third, and fourth falling film evaporators are respectively connected to a first separator, a second separator, a third separator, and a fourth separator via gas circulation pipes. Each of the first, second, third, and fourth falling film evaporators has a feed inlet and a concentrate outlet, and the feed inlet and the concentrate outlet are sequentially connected, including a feed pipe and a main steam pipe. The feed pipe is connected to the feed inlet of the first falling film evaporator via a pump, and the main steam pipe is connected to the heating steam inlet of the first falling film evaporator via a first diversion valve and a first diversion pipe. The gas phase outlet of the first separator is connected to the heating steam inlet of the second falling film evaporator via a first gas guide pipe. The gas phase outlet of the second separator is connected to the heating steam inlet of the third falling film evaporator via a second gas guide pipe. The gas phase outlet of the third separator is connected to the heating steam inlet of the fourth falling film evaporator via a third gas guide pipe. The middle part of the first gas guide pipe is connected to a first transition pipe via a first three-way valve. The other end of the first transition pipe is connected to the middle part of the second gas guide pipe. A first check valve is installed on the first gas guide pipe between the first three-way valve and the heating steam inlet of the second falling film evaporator. The main steam pipeline is connected to a second branch pipe via a second branch valve. The other end of the second branch pipe is connected to the first gas guide pipe between the first check valve and the heating steam inlet of the second falling film evaporator.
[0006] In some embodiments, the concentrate outlet at the bottom of the fourth falling film evaporator is connected to a first discharge pipe and a second discharge pipe via a pump. Both the first discharge pipe and the second discharge pipe are equipped with discharge valves, and the end of the first discharge pipe is connected to the feed pipe.
[0007] In some embodiments, the gas phase outlet of the fourth separator is connected to a cooling tower.
[0008] In some embodiments, the middle part of the third air guide pipe is connected to a second transition pipe via a second three-way valve, and the other end of the second transition pipe is connected to the cooling tower. The main steam pipe is connected to a third branch pipe via a third branch valve, and the other end of the third branch pipe is connected to the middle part of the third air guide pipe.
[0009] In some embodiments, a temperature detection device is provided at both the first transition tube and the second transition tube.
[0010] In some embodiments, air pressure detection devices are provided at the first air duct, the second air duct, and the third air duct.
[0011] The beneficial effects of this application are as follows: By setting up a second three-way valve, a second diversion pipe, a first jump pipe, and a first check valve in cooperation, a portion of the steam that originally flowed into the second falling film evaporator can be diverted through the first jump pipe and directly enter the third falling film evaporator, thereby directly increasing the temperature of the heating steam in the third falling film evaporator. At the same time, the second diversion pipe adds the live steam in the main steam pipe to the first gas guide pipe and finally enters the second falling film evaporator, thereby increasing the temperature of the heating steam in the second falling film evaporator. Furthermore, this application allows for convenient and flexible adjustment of the temperature of the steam entering the second and third falling film evaporators, compensating for the problem that the temperature in the pre-effect separator is too low to be sufficient for evaporation operation in the subsequent effect heater.
[0012] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description
[0013] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:
[0014] Figure 1 This is a schematic diagram of the overall structure of a four-effect falling film evaporator for producing concentrated milk, provided in an embodiment of this application.
[0015] Figure 2 This is a partial structural diagram of the first falling film evaporator and the first separator provided in the embodiments of this application.
[0016] The reference numerals in the detailed embodiments are as follows:
[0017] A four-effect falling film evaporator 100 is used in the production of concentrated milk. It includes a first falling film evaporator 110, a feed inlet 111, a concentrate outlet 112, a heating steam inlet 113, a second falling film evaporator 120, a third falling film evaporator 130, a fourth falling film evaporator 140, a first separator 151, a second separator 152, a third separator 153, a fourth separator 154, a feed pipe 160, a main steam pipe 170, and a first gas guide. Pipe 181, second air guide pipe 182, third air guide pipe 183, first transition pipe 184, second transition pipe 185, first three-way valve 186, second three-way valve 187, first check valve 188, first discharge pipe 191, second discharge pipe 192, cooling tower 193, first diverter valve 194, first diverter pipe 195, second diverter valve 196, second diverter pipe 197, third diverter valve 198, third diverter pipe 199. Detailed Implementation
[0018] The embodiments of the technical solution of this application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and the foregoing description of the accompanying drawings are intended to cover non-exclusive inclusion.
[0019] For details, please refer to Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the overall structure of a four-effect falling film evaporator used in the production of concentrated milk, as provided in an embodiment of this application. Figure 2This is a partial structural diagram of the first falling film evaporator and the first separator provided in an embodiment of this application. The four-effect falling film evaporator 100 used for producing concentrated milk includes a first falling film evaporator 110, a second falling film evaporator 120, a third falling film evaporator 130, and a fourth falling film evaporator 140 arranged sequentially. The first falling film evaporator 110, the second falling film evaporator 120, the third falling film evaporator 130, and the fourth falling film evaporator 140 are respectively connected to a first separator 151, a second separator 152, a third separator 153, and a fourth separator 154 via gas circulation pipes. The first falling film evaporator 110... The second falling film evaporator 120, the third falling film evaporator 130, and the fourth falling film evaporator 140 all have an inlet 111 and a concentrate outlet 112, which are sequentially connected. During operation, concentrated milk material is fed into the first falling film evaporator 110. After the material undergoes a first concentration in the first falling film evaporator 110, it enters the second falling film evaporator 120. This cycle repeats for four times before the concentrated milk material is discharged from the bottom of the fourth falling film evaporator 140 at the concentrate outlet. All of the above configurations are existing technologies and will not be elaborated upon here. The four-effect falling film evaporator 100 used for producing concentrated milk includes an inlet pipe 160 and a main steam pipe 170. The inlet pipe 160 is connected to the inlet 111 of the first falling film evaporator 110 via a pump. The inlet pipe 160 is used to transport the concentrated milk raw material into the first falling film evaporator 110 along the inlet 111. The main steam pipe 170 is connected to the heating steam inlet 113 of the first falling film evaporator 110 through the first diversion valve 194 and the first diversion pipe 195. The live steam in the steam pipe can enter the heating steam inlet 113 of the first falling film evaporator 110 through the first diversion pipe 195. The gas phase outlet of the first separator 151 is connected to the heating steam inlet 113 of the second falling film evaporator 120 via the first gas guide pipe 181. The gas phase outlet of the second separator 152 is connected to the heating steam inlet 113 of the third falling film evaporator 130 via the second gas guide pipe 182. The gas phase outlet of the third separator 153 is connected to the heating steam inlet 113 of the fourth falling film evaporator 140 via the third gas guide pipe 183. The heating steam passes sequentially through the first falling film evaporator 110, the first separator 151, the second falling film evaporator 120, the second separator 152, the third falling film evaporator 130, the third separator 153, the fourth falling film evaporator 140, and the fourth separator before being discharged, thus achieving multi-effect utilization of steam. It is understood that the steam temperature will gradually decrease during this process.The middle part of the first gas guide pipe 181 is connected to the first transition pipe 184 through the first three-way valve 186. The other end of the first transition pipe 184 is connected to the middle part of the second gas guide pipe 182. The first transition pipe 184 can divert part of the steam in the first gas guide pipe 181 and guide it to the middle part of the second gas guide pipe 182, and finally enter the heating steam inlet 113 of the third falling film evaporator 130 along the second gas guide pipe 182. It should be noted that the steam in the first transition pipe 184 has a higher temperature than the original steam temperature in the second gas guide pipe 182 because it has not passed through the second falling film evaporator 120. The remaining steam in the first gas guide pipe 181 continues to flow into the second falling film evaporator 120. A first check valve 188 is installed on the first gas guide pipe 181 between the first three-way valve 186 and the heating steam inlet 113 of the second falling film evaporator 120. The main steam pipe 170 is connected to a second diversion pipe 197 through the second diversion valve 196. The other end of the second diversion pipe 197 is connected to the first gas guide pipe 181 between the first check valve 188 and the heating steam inlet 113 of the second falling film evaporator 120. Some of the steam in the first gas guide pipe 181 enters the second gas guide pipe 182 directly through the first transition pipe 184. At this time, the live steam in the main steam pipe can be supplemented to the first gas guide pipe 181 through the second diversion pipe 197 and finally enters the heating steam inlet 113 of the second falling film evaporator 120 along the first gas guide pipe 181. It can be understood that the temperature of the part of the steam introduced into the first gas guide pipe 181 from the main steam pipe should be higher than the temperature of the remaining steam in the original first gas guide pipe 181.
[0020] As can be seen from the above, in this embodiment, by setting the second three-way valve 187, the second diversion pipe 197, the first jump pipe 184, and the first check valve 188 to cooperate with each other, part of the steam that originally flowed into the second falling film evaporator 120 can be diverted through the first jump pipe 184 and directly enter the third falling film evaporator 130, thereby directly increasing the temperature of the heating steam in the third falling film evaporator 130. At the same time, the second diversion pipe 197 is used to add the live steam in the main steam pipe 170 to the first gas guide pipe 181 and finally enter the second falling film evaporator 120, thereby increasing the temperature of the heating steam in the second falling film evaporator 120. Thus, this application can conveniently and flexibly adjust the temperature of the steam entering the second falling film evaporator 120 and the third falling film evaporator 130, making up for the problem that the temperature in the pre-effect separator is too low to be sufficient for the evaporation operation in the subsequent effect heater.
[0021] In some embodiments, the concentrate outlet 112 at the bottom of the fourth falling film evaporator 140 is connected to a first discharge pipe 191 and a second discharge pipe 192 via a pump. Both the first discharge pipe 191 and the second discharge pipe 192 are equipped with discharge valves. The end of the first discharge pipe 191 is connected to the feed pipe 160. In this embodiment, with the above configuration, the concentrated milk after evaporation and concentration at the bottom of the fourth falling film evaporator 140 can re-enter the feed pipe 160 through the first discharge pipe 191 and circulate back into the first falling film evaporator 110 for further evaporation and concentration, thereby improving the quality of the finished concentrated milk product.
[0022] In some embodiments, the gas phase outlet of the fourth separator 154 is connected to a cooling tower 193. In this embodiment, the gas phase flowing out of the gas phase outlet of the first separator 151 can be sent to the cooling tower 193 for cooling.
[0023] In some embodiments, the middle of the third air guide pipe 183 is connected to the second transition pipe 185 via the second three-way valve 187, and the other end of the second transition pipe 185 is connected to the cooling tower 193. The main steam pipe 170 is connected to the third branch pipe 199 via the third branch valve 198, and the other end of the third branch pipe 199 is connected to the middle of the third air guide pipe 183. In this embodiment, the second transition pipe 185 is configured similarly to the first transition pipe 184 in the above embodiment, and the third branch pipe 199 is configured similarly to the second branch pipe 197. The specific configuration and working principle can be referred to above. Here, the temperature of the steam entering the fourth falling film evaporator 140 can be conveniently and flexibly adjusted through the above configuration.
[0024] In some embodiments, temperature detection devices are provided at both the first transition pipe 184 and the second transition pipe 185. In this embodiment, by setting temperature detection devices to detect the temperature of the first transition pipe 184 and the second transition pipe 185, it is convenient for operators to flexibly adjust the gas flow rate in each pipe according to the detected temperature.
[0025] In some embodiments, air pressure detection devices are provided at the first air guide pipe 181, the second air guide pipe 182, and the third air guide pipe 183. In this embodiment, the air pressure detection devices facilitate the detection of air pressure at various points, thereby ensuring production safety.
[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although the foregoing embodiments have provided a detailed description of this application, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A four-effect falling film evaporator for producing concentrated milk, comprising a first falling film evaporator, a second falling film evaporator, a third falling film evaporator, and a fourth falling film evaporator arranged sequentially, wherein the first falling film evaporator, the second falling film evaporator, the third falling film evaporator, and the fourth falling film evaporator are respectively connected to a first separator, a second separator, a third separator, and a fourth separator via gas circulation pipes, wherein each of the first falling film evaporator, the second falling film evaporator, the third falling film evaporator, and the fourth falling film evaporator has a feed inlet and a concentrate outlet, and the feed inlet and the concentrate outlet are sequentially connected, characterized in that, Including the feed pipe and the main steam pipe; The feed pipe is connected to the feed inlet of the first falling film evaporator via a pump. The main steam pipe is connected to the heating steam inlet of the first falling film evaporator via a first diversion valve and a first diversion pipe. The gas phase outlet of the first separator is connected to the heating steam inlet of the second falling film evaporator via a first gas guide pipe. The gas phase outlet of the second separator is connected to the heating steam inlet of the third falling film evaporator via a second gas guide pipe. The gas phase outlet of the third separator is connected to the heating steam inlet of the fourth falling film evaporator via a third gas guide pipe. The middle part of the first gas guide pipe is connected to a first transition pipe via a first three-way valve. The other end of the first transition pipe is connected to the middle part of the second gas guide pipe. A first check valve is installed on the first gas guide pipe between the first three-way valve and the heating steam inlet of the second falling film evaporator. The main steam pipe is connected to a second diversion pipe via a second diversion valve. The other end of the second diversion pipe is connected to the first gas guide pipe between the first check valve and the heating steam inlet of the second falling film evaporator.
2. The four-effect falling film evaporator for producing concentrated milk according to claim 1, characterized in that, The concentrate outlet at the bottom of the fourth falling film evaporator is connected to a first discharge pipe and a second discharge pipe via a pump. Both the first discharge pipe and the second discharge pipe are equipped with discharge valves. The end of the first discharge pipe is connected to the feed pipe.
3. The four-effect falling film evaporator for producing concentrated milk according to claim 1, characterized in that, The gas phase outlet of the fourth separator is connected to a cooling tower.
4. The four-effect falling film evaporator for producing concentrated milk according to claim 3, characterized in that, The middle part of the third air guide pipe is connected to the second jump pipe through the second three-way valve, and the other end of the second jump pipe is connected to the cooling tower. The main steam pipe is connected to the third diversion pipe through the third diversion valve, and the other end of the third diversion pipe is connected to the middle part of the third air guide pipe.
5. The four-effect falling film evaporator for producing concentrated milk according to claim 4, characterized in that, Temperature detection devices are installed at both the first transition tube and the second transition tube.
6. The four-effect falling film evaporator for producing concentrated milk according to claim 1, characterized in that, Air pressure detection devices are installed at the first air guide tube, the second air guide tube, and the third air guide tube.