Heat exchange unit and pasteurization device

Abstract

The utility model relates to the technical field of dairy product processing, and provides a heat exchange unit and a pasteurization device, comprising a heat exchange main body comprising at least three heat exchange sections; the sterilization main body comprises a heat supply section and a sterilization section, the heat supply section is suitable for allowing an external heating pipeline to penetrate through, and heat exchange media are arranged in the heat exchange section and the heat supply section and are suitable for transferring heat; the feed liquid pipeline sequentially penetrates through the at least three heat exchange sections, passes through the heat supply section and the sterilization section and then sequentially and reversely penetrates back from the at least three heat exchange sections, and the feed liquid pipeline is suitable for feeding feed liquid and allowing the feed liquid to flow along a passing track. At least three heat exchange sections are arranged, in the heat exchange process, stepped subsections of feed liquid temperature rising are increased, the temperature difference of feed liquid temperature rising of all the sections is correspondingly reduced, and the problems are effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of dairy product processing, in particular to a heat exchange unit and a pasteurization device. Background Art

[0002] In the dairy processing industry, in order to increase the shelf life of dairy products, liquid dairy products are usually heated for a certain period of time, that is, pasteurization. In the actual production process, pasteurization or pre-sterilization is mainly carried out through pasteurization machines to prevent the growth and reproduction of microorganisms that reduce nutritional value and sensory quality, and avoid the production of harmful and toxic substances.

[0003] The liquid milk heat exchange unit is one of the important units of the pasteurizer. In some pasteurizers, a plate heat exchanger is installed inside the liquid milk heat exchange unit, which can exchange heat between the hot milk that has completed the sterilization process and the liquid milk with a lower temperature, and recover heat through heat exchange with milk to achieve energy saving.

[0004] In the heat exchange unit, it is usually divided into a heat recovery section, a hot water heating section and a cooling section. The heat recovery section is usually a single-stage or double-stage plate heat exchanger. However, in practice, liquid milk often undergoes protein denaturation during the heating process, which leads to problems such as plate sticking in the hot water heating section, reducing heat exchange efficiency, increasing failure rate, and making it difficult to clean. Utility Model Content

[0005] In view of this, the utility model provides a heat exchange unit and a pasteurization device to solve the problem of plate sticking easily occurring in the heat exchange unit of the pasteurization machine.

[0006] In the first aspect, the utility model provides a heat exchange unit, comprising: a heat exchange body, comprising at least three heat exchange sections; a sterilization body, comprising a heating section and a sterilization section, the heating section being suitable for the passage of an external heating pipeline, the heat exchange section and the heating section being provided with a heat exchange medium suitable for transferring heat; a feed liquid pipeline, passing through the at least three heat exchange sections in sequence, and after passing through the heating section and the sterilization section, passing back in reverse from the at least three heat exchange sections in sequence, the feed liquid pipeline being suitable for passing feed liquid and providing the feed liquid to flow along the passage trajectory.

[0007] Beneficial effects:

[0008] A plurality of heat exchange sections are provided, and the feed liquid pipeline passes through these heat exchange sections in sequence and passes through these heat exchange sections in the reverse direction after completing heating and sterilization. The residual heat of the feed liquid after heating is used to heat the feed liquid before entering the sterilization body, thereby realizing mutual heat exchange between the feed liquid and the sterilization body.

[0009] Furthermore, in the heat exchange section with a large temperature difference between the feed and liquid, the rapid heating of the feed and liquid may lead to untimely heat exchange of the feed and liquid adjacent to the tube wall, resulting in rapid dehydration, followed by condensation of the feed and heat concentration, which will cause the feed and liquid to stick to the plate. By setting at least three heat exchange sections, compared with the single-stage or double-stage heat recovery section, at least one heat exchange section is added, that is, in the heat exchange process, the step-by-step section of the feed and liquid heating is increased, and the temperature difference of the feed and liquid heating in each section is correspondingly reduced, effectively avoiding the occurrence of the above problems.

[0010] In an optional embodiment, the heat supply section and the heat exchange body are spaced apart from each other.

[0011] In an optional embodiment, the heat exchange unit further includes: a heat exchange rack, including a plurality of heat insulating parts, on which the heat exchange body is correspondingly mounted, and the heat insulating parts are suitable for correspondingly separating each of the heat exchange sections; a heating rack, which is separated from and away from the heat exchange rack, and on which the heating sections are correspondingly mounted.

[0012] In an optional embodiment, the heat exchange unit further includes: a thermal insulation jacket, which is correspondingly arranged on the heat exchange frame and the heat supply frame, and is suitable for covering the outside of the heat exchange section and the heat supply section.

[0013] In an optional embodiment, the heat exchange unit further includes: a cooling section, in which a heat exchange medium is arranged and a cooling pipeline is passed through, the feed liquid pipeline is passed through the cooling section, and the cooling section is arranged downstream of the heat exchange body along the feed liquid flow trajectory.

[0014] In an optional embodiment, the cooling section is correspondingly arranged on the heat exchange frame, the heat insulation component is suitable for separating the cooling section and the heat exchange body, and the thermal insulation jacket is correspondingly arranged on the outside of the cooling section.

[0015] In an optional embodiment, the heat exchange unit further includes: a pressurizing element, which is arranged on the feed liquid pipeline and correspondingly arranged between the first heat exchange section through which the feed liquid passes and the sterilization section.

[0016] In an optional embodiment, the booster is correspondingly arranged on the liquid pipeline between the first heat exchange section and the second heat exchange section through which the liquid passes.

[0017] In an optional embodiment, the temperature of the heat medium in the heating pipeline is T, 74℃≤T≤78℃; the sterilization section is in the shape of a spiral tube and is adjacent to the heating section, and the sterilization section is suitable for the flow of the slurry for a first preset time t, 15s≤t≤20s; the temperature of the slurry before passing through the first heat exchange section is T1, and the temperature after passing through the cooling section is T2, 1℃≤T1≤7℃, 1℃≤T2≤7℃, and / or, the temperature of the slurry before passing through the first heat exchange section is T3, 50℃≤T3≤60℃.

[0018] In a second aspect, the utility model further provides a pasteurization device, comprising the above-mentioned heat exchange unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic structural diagram of a heat exchange unit according to an embodiment of the utility model;

[0021] Description of reference numerals:

[0022] 1. Heat exchange section; 2. Heating section; 21. Heating pipeline; 3. Sterilization section; 4. Liquid pipeline; 5. Cooling section; 51. Cooling pipeline; 6. Heat exchange rack; 61. Thermal insulation; 7. Heating rack; 8. Pressurization component; 9. Pressure sensor; 10. Temperature sensor. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 As shown, in the first aspect, the utility model provides a heat exchange unit, including: a heat exchange body, a sterilization body and a liquid pipeline 4.

[0025] In this embodiment, the heat exchange body includes three heat exchange sections 1. It can be understood that the heat exchange body may include more than three heat exchange sections 1.

[0026] The sterilization body includes a heating section 2 and a sterilization section 3. An external heating pipeline 21 is provided inside the heating section 2. A heating medium, specifically hot water, etc., is provided inside the heating section 1 and the heating section 2. A heat exchange medium is suitable for transferring heat. Specifically, the heat exchange medium can be in the form of a heat exchange plate, a heat exchange plate group, a heat exchange tube group, etc., and the material can be metal, heat conductive ceramics, etc.;

[0027] The liquid feed pipeline 4 sequentially passes through the three heat exchange sections 1 included in the heat exchange body, passes through the heating section 2 and the sterilization section 3, and then respectively passes back from the three heat exchange sections 1 in reverse order. The liquid feed pipeline 4 is suitable for passing the liquid feed and providing the liquid feed to flow along the passing trajectory. In this embodiment, three heat exchange sections 1 are provided, namely, heat exchange section 1, heat exchange section 2, and heat exchange section 3. Figure 1 Arranged from left to right in the figure, the feed liquid flows along the feed liquid pipeline 4 through the first heat exchange section, the second heat exchange section, the third heat exchange section, the heating section 2, the sterilization section 3, the third heat exchange section, the second heat exchange section and the first heat exchange section in sequence. The feed liquid is milk, or other liquid dairy products. Preferably, the portion of the feed liquid pipeline 4 exposed to the outside of the heat exchange body and the sterilization body can be made of heat insulating material, and the portion penetrating into the heat exchange body and the sterilization body can be made of heat conductive material. As a convertible embodiment, the heat exchange body and the sterilization body are respectively provided with a feed liquid inlet and a feed liquid outlet, and the portion of the feed liquid pipeline 4 penetrating into the heat exchange body and the sterilization body can be integrally arranged with the heat exchange body and the sterilization body.

[0028] A plurality of heat exchange sections 1 are provided, and the feed liquid pipeline 4 passes through these heat exchange sections 1 in sequence and reversely passes through these heat exchange sections 1 after completing heating and sterilization. The residual heat of the feed liquid after heating is used to heat the feed liquid before entering the sterilization body, thereby realizing mutual heat exchange between the feed liquids.

[0029] Furthermore, in the heat exchange section 1 where the temperature difference between the feed and liquid is large, the rapid heating of the feed may cause untimely heat exchange of the feed adjacent to the tube wall, leading to rapid dehydration. After that, the feed condenses and the heat is concentrated, resulting in the problem of the feed sticking to the plate. By setting at least three heat exchange sections 1, compared with the single-stage or double-stage heat recovery section, at least one heat exchange section 1 is added, that is, during the heat exchange process, the step-by-step segmentation of the feed temperature rise is increased, and the temperature difference of the feed temperature rise in each section is correspondingly reduced, effectively reducing or avoiding the occurrence of the above-mentioned problems. In addition, compared with the prior art, such a setting occupies less space for the newly added structure, has lower modification difficulty, and has less impact on the operation of existing equipment.

[0030] In this embodiment, the heating section 2 and the heat exchange body are far away from each other and are separated.

[0031] On the one hand, the two are separated and far away from each other in space, which makes it convenient for operators to disassemble and maintain the heating section 2 and the heat exchange main body separately. Since both the heating section 2 and the heat exchange main body heat the slurry, sporadic blockages or plate sticking problems may occur. This arrangement makes disassembly convenient, reduces the workload of equipment maintenance, and improves the service life of the equipment and the flexibility of matching. On the other hand, the independently set heating section 2 is a single section, which is easy to maintain and has a small temperature difference between the inlet and outlet of the heating medium, saving energy.

[0032] As a convertible embodiment, the heating section 2 and the heat exchange body can be arranged integrally.

[0033] In an optional implementation, the heat exchange unit further includes: a heat exchange frame 6 and a heat supply frame 7 .

[0034] Both are in the shape of a frame, wherein the heat exchange frame 6 is respectively provided with a heat exchange main body and a plurality of heat insulating members 61, the heat insulating members 61 can be specifically heat insulating plates, made of heat insulating materials, such as high temperature and high pressure resistant resin composite materials, rock wool composite materials, etc., and the number of the heat insulating members 61 can be set according to the number of heat exchange sections 1 on the heat exchange main body and the number of other structures installed on the heat exchange frame 6, and the heat insulating members 61 can be used to separate the heat exchange sections 1 accordingly;

[0035] The heating frame 7 and the heat exchange frame 6 are separated and arranged away from each other, and the heating section 2 is correspondingly installed on the heating frame 7. In this embodiment, the bottom of the heating frame 7 and the heat exchange frame 6 can be provided with wheels to facilitate the movement of the operator.

[0036] In addition, the heat exchange unit also includes a thermal insulation jacket.

[0037] There are two insulation jackets, both made of insulation materials, which are respectively arranged on the heat exchange frame 6 and the heat supply frame 7, and are covered on the outside of the heat exchange section 1 and the heat supply section 2. This arrangement can reduce the energy consumption of the heat exchange section 1 and the heat supply section 2 due to heat radiation, and improve the thermal efficiency of the heat exchange unit. As a convertible implementation, it can also be arranged on only one of the heat exchange frame 6 and the heat supply frame 7.

[0038] The heat exchange unit further comprises a cooling section 5 .

[0039] The cooling section 5 is also provided with a heat exchange medium suitable for transferring heat. Specifically, the heat exchange medium can be in the form of a heat exchange plate, a heat exchange plate group, a heat exchange tube group, etc., and can be made of metal, heat-conducting ceramics, etc. A cooling pipeline 51 is also provided in the cooling section 5, and a cooling medium flows inside. The cooling medium can be a fluid such as ice water or cold water. The liquid feed pipeline 4 is also provided in the cooling section 5, and the cooling section 5 is provided downstream of the heat exchange main body along the liquid feed flow trajectory. Preferably, the cooling section 5 is correspondingly provided on the heat exchange frame 6, the heat insulation 61 separates the cooling section 5 and the heat exchange main body, and the insulation jacket is correspondingly provided on the outside of the cooling section 5.

[0040] The setting of the cooling section 5 can cool the pasteurized milk to a lower temperature through the heat absorption of the cooling pipeline 51. Preferably, the cooling section 5 can cool the liquid to the temperature before the liquid enters the heat exchange body, so that the temperature of the liquid before and after pasteurization remains stable. It can be understood that it can also be cooled to other required temperatures.

[0041] In this embodiment, the temperature of the feed liquid before passing through the first heat exchange section 1 is T1, and the temperature of the feed liquid after passing through the cooling section 5 is T2, 1°C≤T1≤7°C, 1°C≤T2≤7°C.

[0042] The heat exchange unit further comprises a pressure increasing component 8 .

[0043] The booster 8 can be a material booster pump, which is arranged on the liquid feed pipeline 4 and is correspondingly arranged between the first heat exchange section 1 through which the liquid feed passes and the sterilization section 3. The booster pump can increase the pressure of the material in the liquid feed pipeline 4 and ensure the stability of the liquid feed flow rate.

[0044] Preferably, the booster 8 is arranged between the first heat exchange section 1 and the second heat exchange section 1 through which the feed liquid passes. As the temperature of the feed liquid increases, its viscosity increases, and the flow resistance between the feed liquid and the inner wall of the pipeline increases, thereby reducing the flow rate of the feed liquid. Between the first heat exchange section 1 and the second heat exchange section 1, the temperature rise of the feed liquid is the largest, and the change in the feed liquid flow rate is the most obvious. By arranging the booster 8 at this position, the stability of the feed liquid flow rate can be effectively guaranteed.

[0045] In this embodiment, the temperature of the heat medium in the heating pipeline 21 is T, 74°C≤T≤78°C, specifically 74°C, 75°C, 76°C, 77°C and 78°C, preferably in the range of 76°C to 77°C. Further preferably, when the feed liquid passes through the heating section 2, its temperature rises to a temperature close to that of the heat medium, and the average temperature difference is 1°C. In this embodiment, when the feed liquid passes through the heating section 2, its temperature rises to a range of 73°C to 77°C, preferably in the range of 75°C to 76°C, and the specific value can be changed according to the temperature of the heat medium.

[0046] The sterilization section 3 is in the shape of a spiral tube and is adjacent to the heating section 2. The adjacent sterilization section 3 can keep the feed liquid under the temperature condition after heating for a certain period of time to meet the pasteurization conditions. The sterilization section 3 is suitable for the feed liquid to flow for a first preset time t, 15s≤t≤20s, which can be 15 seconds, 16 seconds, 17 seconds, 18 seconds, 19 seconds or 20 seconds, among which 15 seconds is preferred.

[0047] As a convertible implementation, the temperature T may be in the range of 62°C to 65°C, and the sterilization section 3 may be a container such as a heat preservation cylinder, so that the material can be kept warm for 30 minutes.

[0048] In addition, the heat exchange unit also includes: a plurality of temperature sensors 10 and a plurality of pressure sensors 9, both of which are specifically temperature sensors and pressure sensors. In this embodiment, the temperature sensor and the pressure sensor are connected to the external controller through a wire or a wireless transmitter. It can be understood that both can also be provided with an instrument or display to display the measured values ​​in real time. Both the temperature sensor 10 and the pressure sensor 9 are correspondingly arranged on at least one of the liquid pipeline 4, the cooling pipeline 51 and the heating pipeline. The specific setting position can be set according to the corresponding pipeline to be detected.

[0049] Define along the flow direction of the feed liquid, the section of the feed liquid pipeline 4 that passes through the three heat exchange sections 1 and the sterilization section 3 for the first time is defined as the temperature rising section, and the section of the feed liquid pipeline 4 that passes through the sterilization section 3 and reversely passes through the three heat exchange sections 1 for the second time is defined as the temperature falling section.

[0050] In this embodiment, temperature sensors 10 and pressure sensors 9 are respectively provided on the liquid-feed pipeline 4 between the three heat exchange sections 1 of the cooling section; temperature sensors 10 and pressure sensors 9 are provided on the liquid-feed pipeline 4 between the heat exchange main body of the cooling section and the sterilization section 3; the inlet and outlet ends of the heating pipeline 21 are respectively connected with temperature sensors 10, and a pressure sensor 9 is also provided at the inlet end; the inlet end of the cooling pipeline 51 is connected with a temperature sensor 10; the portion of the liquid-feed pipeline 4 passing through the cooling section 5 is provided with a temperature sensor 10 and a pressure sensor 9; the portion of the liquid-feed pipeline 4 before entering the heat exchange main body is provided with a temperature sensor 10 and a pressure sensor 9.

[0051] In addition, the temperature of the feed liquid after passing through the first heat exchange section 1 is set to T3, 50°C≤T3≤60°C. Preferably, T3 is 55°C.

[0052] The initial temperature rise of the feed liquid is set within this range. On the one hand, during the pasteurization process, the milk liquid needs to be heated to about 75 degrees to achieve disinfection in a short time. Setting the initial temperature rise T3 of the feed liquid within this range can quickly heat up and reduce the temperature difference of the subsequent heat exchange section 1. Timely heat exchange of the feed liquid in the feed liquid pipeline 4 is ensured. On the other hand, since the milk liquid begins to dehydrate at 60 to 62 degrees Celsius, when the temperature is lower than 60 to 62 degrees Celsius, even if the feed liquid at the adjacent position of the pipe wall is heated quickly and the heat exchange is not timely, the milk liquid will not be quickly dehydrated due to heating.

[0053] As shown in the following table, it is a preferred rated temperature variation table of the feed liquid, heating medium and cooling medium flowing through the cooling section 5, each heat exchange section 1 and the heating section 2:

[0054] Table 1 Rated temperature changes of each section

[0055]

[0056] In a second aspect, the utility model further provides a pasteurization device, comprising the above-mentioned heat exchange unit.

[0057] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A heat exchange unit, suitable for a pasteurization device, characterized in that: include: A heat exchange body, comprising at least three heat exchange sections (1); The sterilization body comprises a heating section (2) and a sterilization section (3), wherein the heating section (2) is suitable for an external heating pipeline (21) to pass through, and a heat exchange medium is arranged in the heat exchange section (1) and the heating section (2) to transfer heat; The feed liquid pipeline (4) passes through the at least three heat exchange sections (1) in sequence, passes through the heating section (2) and the sterilization section (3), and then passes back in sequence from the at least three heat exchange sections (1). The feed liquid pipeline (4) is suitable for passing the feed liquid and allowing the feed liquid to flow along the passage trajectory.

2. The heat exchange unit according to claim 1, characterized in that: The heating section (2) and the heat exchange body are spaced apart from each other and are arranged separately.

3. The heat exchange unit according to claim 2, characterized in that: Also includes: A heat exchange frame (6) comprising a plurality of heat insulating members (61), the heat exchange body being correspondingly mounted on the heat exchange frame (6), the heat insulating members (61) being suitable for correspondingly separating the heat exchange sections (1); The heating frame (7) is spaced apart from and separated from the heat exchange frame (6), and the heating frame (7) is correspondingly provided with the heating section (2).

4. The heat exchange unit according to claim 3, characterized in that: Also includes: The heat-insulating jacket is correspondingly arranged on the heat exchange frame (6) and the heat supply frame (7), and is suitable for covering the outside of the heat exchange section (1) and the heat supply section (2).

5. The heat exchange unit according to any one of claims 1 to 4, characterized in that: Also includes: The cooling section (5) contains a heat exchange medium and is provided with a cooling pipeline (51). The feed liquid pipeline (4) is provided on the cooling section (5). The cooling section (5) is provided downstream of the heat exchange body along the feed liquid flow trajectory.

6. The heat exchange unit according to claim 5, characterized in that: The cooling section (5) is correspondingly arranged on the heat exchange frame (6), the heat insulation member (61) on the heat exchange frame (6) is suitable for separating the cooling section (5) and the heat exchange body, and the heat insulation jacket is correspondingly arranged on the outside of the cooling section (5).

7. The heat exchange unit according to any one of claims 1 to 4 and 6, characterized in that: Also includes: The pressure booster (8) is arranged on the feed liquid pipeline (4) and is correspondingly arranged between the first heat exchange section (1) through which the feed liquid passes and the sterilization section (3).

8. The heat exchange unit according to claim 7, characterized in that: The pressure increasing component (8) is correspondingly arranged on the liquid pipeline (4) between the first heat exchange section (1) and the second heat exchange section (1) through which the liquid passes.

9. The heat exchange unit according to any one of claims 1-4, 6 and 8, characterized in that: The temperature of the heating medium in the heating pipeline (21) is T, 74°C≤T≤78°C; The sterilization section (3) is in the shape of a spiral tube and is adjacent to the heating section (2). The sterilization section (3) is suitable for allowing the liquid to flow for a first preset time t, 15s≤t≤20s; The temperature of the feed liquid before passing through the first heat exchange section (1) is T1, and the temperature of the feed liquid after passing through the cooling section (5) is T2, 1°C≤T1≤7°C, 1°C≤T2≤7°C, and / or the temperature of the feed liquid after passing through the first heat exchange section (1) is T3, 50°C≤T3≤60°C.

10. A pasteurization device, characterized in that: include: The heat exchange unit according to any one of claims 1 to 9.

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