JP3188096U - Heat exchanger for food process - Google Patents

Abstract

A heat exchanger for a food process in which a denatured product or a content of a heat-treated fluid that is food does not adhere to the heat exchanger on a plate forming the heat-treated fluid passage and its surrounding piping, and the heat exchanger Provide peripheral piping.
Heat exchange for a food process in which a metal plate is fixed at intervals, and the food, which is a heating medium V and a heated fluid F, is alternately circulated through the plurality of intervals, to heat-treat the food. A food process heat exchanger 10 in which the surface of the plate that comes into contact with food is coated with one of PPSU, PSU, and PESU, which are super engineering plastics of amorphous and sulfone resin, and The surrounding piping.
[Selection] Figure 2

Description

  The present invention relates to a heat exchanger used in a heat treatment performed for sterilization and processing of dairy products, various beverages, various seasonings, mayonnaise, cheese, oils and fats, and the like.

  Dairy products represented by milk, various beverages, various seasonings, mayonnaise, cheese, curry roux, and fat products are heat sterilized. By heat sterilization, food quality is maintained, bacteria and microorganisms are killed, hygiene hazards are prevented, and safety is maintained.

  However, the temperature of heat sterilization in milk and the like has increased by about 10 ° C. in the last 10 years, and there are cases where the temperature exceeds 140 ° C. at the maximum. As the sterilization temperature rises, the denaturation of calcium and protein in milk increases, and adhesion to the heat transfer plate surface of the stainless steel heat exchanger and the surrounding pipe inner surface increases. As a result, the continuous operation time of the heat sterilization process is shortened. If denatured calcium or protein adheres to the surface of the heat transfer plate of the stainless steel heat exchanger or the surrounding pipe inner surface, the heat sterilization process is interrupted and the heat transfer plate of the stainless steel heat exchanger is removed by CIP (fixed cleaning). The surface and the inner surface of the surrounding piping must be cleaned. If the adhesion of the stainless steel heat exchanger to the surface of the heat transfer plate and the inner surface of the surrounding piping increases, the frequency of cleaning must naturally be increased.

  Even in the production of curry roux, since foods such as honey and wine are mixed with fruits and vegetables, food residues adhere to the surface of the heat transfer plate and the surrounding pipes. It is desirable to enhance the product value of foods such as curry roux with a delicious and mellow taste and aroma and to differentiate the products. The attachment of food residues to the heat transfer plate surface and the inner surface of the surrounding pipes hinders the growth of this delicious and mellow taste and aroma, and frequent removal, that is, cleaning is required.

  As a conventional food process heat exchanger, the flow of fluid to the entire plate surface is made uniform to improve heat transfer performance, and in order to prevent the scale from adhering to the plate, passage holes are opened at the four corners, In the meantime, it is a plate type heat exchanger in which a plurality of plates having a transmission surface portion consisting of a triangular weir transmission surface and a main transmission surface are laminated, and on the transmission surface portion from the inlet side passage hole of the plate to the outlet side passage hole, Plate-type heat exchange that provides a flow path wall that directs the direction of the flow of fluid flowing through the transmission surface, and that distributes the fluid sequentially to the entire plate surface to equalize the flow of fluid across the plate surface. A device has been proposed (see, for example, Patent Document 1).

  As another conventional heat exchanger for food processing, even if a heat exchange medium containing impurities is circulated, the impurities do not accumulate, ensuring the flowability of the heat exchange medium and efficient heat exchange. In order to carry out, a plurality of heat transfer plates having heat transfer portions in which a plurality of ridges and recesses are alternately formed on both front and back surfaces, the heat transfer plates are laminated with the heat transfer portions facing each other. The plate-type heat exchanger in which the first space for circulating the heat exchange medium and the second space for circulating the heat exchange medium are alternately formed with each heat transfer section as a boundary, In addition, the second space is formed between the heat transfer portions in which the protrusions and the recesses are formed in a non-contact manner. A plate heat exchanger has been proposed (see, for example, Patent Document 2).

  Other conventional food process heat exchangers are food process heat exchangers that are coated with engineering plastics such as PEEK, PP, PET, PVDF, PFA, and PTFE on the surface side that comes into contact with food. Proposals have been made to prevent the adhesion of food residues to the surface and improve the chemical cleaning properties of the deposit (see, for example, Patent Document 3).

JP 2004-184077 A JP 2008-121956 A JP 2008-139021 A

  According to the food process heat exchanger according to Patent Document 1, the flow-transmitting portion extending from the inlet-side passage hole to the outlet-side passage hole of the plate, that is, the electric heating portion, is configured to impart flow directionality to the fluid flowing through the transmission portion. A channel wall is provided, and the fluid is sequentially distributed to the entire surface of the plate by the flow channel wall to make the fluid flow uniform on the entire surface of the plate. As a result, the flow of fluid over the entire surface of the plate can be made uniform, and the heat treatment can be performed uniformly and efficiently. However, the plate that forms the liquid passage to be treated is a metal plate that is not surface-treated at all, and it is inevitable that the content of the fluid to be treated adheres to the heat exchanger and its surrounding piping.

  According to the food process heat exchanger according to Patent Document 2, the first space is formed between the heat transfer portions in which the protrusions cross each other, while the second space includes the protrusions and the recesses. Since the formed regions are formed between non-contact heat transfer parts, the heat exchange medium travels between the plates in a direction perpendicular to the plate surface, and flows through the heat exchange medium containing impurities. Even if it makes it, it can carry out uniformly and efficiently, without this impurity accumulating. However, the plate forming the heat exchange medium passage is a metal plate that is not subjected to any surface treatment, and it is inevitable that the content of the heat exchange medium adheres to the heat exchanger and its surrounding piping.

  According to the food process heat exchanger proposed by Patent Document 3, the surface side in contact with the food is coated with engineering plastics such as PEEK, PP, PET, PVDF, PFA, and PTFE. However, as shown in Table 1 described in FIG. 1, engineering plastic has many drawbacks as a material for a heat exchanger for food processing.

(Purpose of the idea)
The present invention has been made in view of the above-mentioned problems in a conventional heat exchanger for food processing, and is a heated processing fluid that is food on a plate that forms a heated processing fluid passage and its surrounding piping. It is an object of the present invention to provide a food process heat exchanger and its surrounding piping in which the modified products and contents thereof are not attached to the heat exchanger.

  The present invention is also capable of performing heat treatment continuously and efficiently for a long time with less problems of deterioration and peeling of the inner surface of the plate and its surrounding piping that are in contact with the fluid to be heated, which is a food, even by high-temperature continuous heat treatment. It is an object of the present invention to provide a food process heat exchanger and its surrounding piping.

  Another object of the present invention is to provide a peripheral pipe of a heat exchanger for a food process capable of efficiently and energy-saving to maintain a high temperature without heating the heat-treated fluid in order to extend the heat treatment time. And

The first idea is
A heat exchanger for a food process in which a metal plate is fixed at intervals, and the food is heat-treated by alternately circulating a heating medium and a food to be heated at a plurality of the intervals. The food process heat exchanger is characterized in that the surface in contact with the food is coated with one of PPSU, PSU and PESU which are super engineering plastics of amorphous and sulfone resin.

The second idea is
A peripheral pipe of a heat exchanger for a food process that heats the food by fixing a metal plate at intervals and alternately circulating a food that is a heating medium and a fluid to be heated at a plurality of intervals. The surface of the plate in contact with the food is covered with one of PPSU, PSU and PESU which are super engineering plastics of amorphous and sulfone resin. It is piping.

Here, the structural formulas of PPSU, PSU, and PESU are as follows.

  According to the food process heat exchanger and its surrounding piping of the present invention, the denatured product and contents of the heated processing fluid which is food are added to the plate forming the heated processing fluid passage and its surrounding piping to the heat exchanger. A food process heat exchanger that does not adhere and its surrounding piping can be configured.

  According to the food process heat exchanger of the present invention and its surrounding piping, there are few problems of deterioration and peeling of the inner surface of the plate and its surrounding piping that are in contact with the fluid to be heated, which is a food, even by continuous high-temperature heat treatment. The food process heat exchanger and its surrounding piping can be configured to perform heat treatment continuously and efficiently for a long time.

  Further, according to the present invention, the peripheral piping of the heat exchanger for a food process capable of efficiently and energy-saving to maintain the heat-treated fluid at a high temperature without heating in order to extend the heat treatment time. Can do.

It is a characteristic comparison table of engineering plastics and super engineering plastics. It is a perspective view of the heat exchanger for food processing of embodiment of this invention, and its periphery piping. It is the front view and gasket explanatory drawing of the heat exchange plate member of the heat exchanger for food processing of embodiment of this invention. It is explanatory drawing of the 1st gasket and 2nd gasket of the heat exchanger for food processing of embodiment of this invention. FIG. 5 is a cross-sectional view taken along line VV in FIG. 3. FIG. 4 is a cross-sectional view taken along line VI-VI in FIG. 3. It is operation | movement explanatory drawing of the heat exchanger for food processing of embodiment of this invention.

  Below, the heat exchanger for food processing and its surrounding piping of embodiment of this invention are demonstrated based on a figure. As shown in FIG. 2, the food process heat exchanger 10 and its peripheral piping 11 heat-treat the heat-treated fluid F such as milk by a heating medium V such as heated steam in a non-contact manner for a predetermined time. .

  As shown in FIG. 2, the food process heat exchanger 10 includes a heat exchange plate member 20 and a first gasket 22 (not shown in FIG. 2) and a second gasket 24 (not shown in FIG. 2) alternately. It is stacked by interposing.

  As shown in FIG. 3, the heat exchange plate member 20 has a heated processing fluid inlet opening 30, a heated processing fluid outlet opening 32, a heating medium inlet opening 34, and a heating medium outlet opening 36 at upper and lower left and right corners. A gasket groove 39 is provided in the periphery of the heat exchange plate member 20.

  The entire surface of the heat exchange plate member 20 is coated with one of PPSU, PSU, and PESU which are super engineering plastics of a coating material, that is, an amorphous / sulfone resin. The coating material is powdered and sprayed onto the plate member of the material of the heat exchange plate member 20, and then welded in a high-temperature furnace.

  As shown in FIG. 3, the heat exchange plate member 20 is formed with a parallel step groove 40 in the central portion for inclining left and right symmetrically and making fluid or the like passing therethrough turbulent.

Diffusion for diffusing the to-be-heated fluid F flowing in from the to-be-heated fluid inlet opening 30 to the width of the parallel-to-groove 40 region between the to-be-heated fluid inlet opening 30 and the region of the parallel corrugated groove 40 A step groove 42 is formed.
Between the heating medium outlet opening 32 and the region of the parallel step groove 40, a concentrated step groove 44 for concentrating the heated processing fluid F from the region of the parallel step groove 40 to the heated processing fluid outlet opening 32 is formed. Has been.

A diffusion step groove 46 for diffusing the heating medium V flowing in from the heating medium inlet opening 34 into the width of the parallel step groove 40 is formed between the heating medium inlet opening 34 and the region of the parallel step groove 40. ing.
A concentrated step groove 48 for concentrating the heating medium V from the parallel step groove 40 region to the heating medium outlet opening 36 is formed between the heating medium outlet opening 36 and the region of the parallel step groove 40.

  As shown in FIG. 4A, the first gasket 22 is disposed in a predetermined portion of the gasket groove 39, and when the heat exchange plate member 20 is stacked, the heated processing fluid inlet opening 30 and the heated processing fluid are stacked. It is formed so as to communicate with the outlet opening 32.

  As shown in FIG. 4B, the second gasket 24 is disposed in a predetermined portion of the gasket groove 39, and when the heat exchange plate member 20 is stacked, the heating medium inlet opening 34 and the heating medium outlet opening 36 are arranged. Are formed to communicate with each other.

The heated fluid outlet opening 32 communicates with the heat treatment piping 50 of the peripheral piping 11 for extending the heat treatment time of the heated fluid F. The heat treatment pipe 50 does not have a heating function, and maintains the heated fluid F heated above the minimum heat treatment temperature in the food process heat exchanger 10 for a predetermined time in a state higher than the minimum heat treatment temperature. Heat treatment.
The inner surface of the heat treatment pipe 50 is coated with one of PPSU, PSU, and PESU which are super engineering plastics of a coating material, that is, an amorphous / sulfone resin. The coating material is powdered and sprayed onto the inner surface of the heat treatment pipe 11 (also referred to as a holding pipe), and then heated to around 400 ° C. and welded.

(Operation of heat exchanger for food process)
As shown in FIG. 7, the food process heat exchanger 10 is operated by arranging a plurality of heat exchange plate members 20 in the same direction, and alternately arranging a first gasket 22 and a second gasket 24 therebetween. Intervene. These include a heated process fluid inlet opening 30, a heated process fluid outlet opening 32, a heating medium inlet opening 34, a front end plate 62 having an opening 60 corresponding to each of the heating medium outlet openings 36, and a heated process fluid inlet. A portion corresponding to each of the opening 30, the heated fluid outlet opening 32, the heating medium inlet opening 34, and the heating medium outlet opening 36 is combined with a rear end plate 64 which is closed, and integrated by a long screw nut (not shown). It becomes.

  In the food process heat exchanger 10 configured as described above, for example, between the first heat exchange plate member 20 (1) from the left in FIG. 7 and the second heat exchange plate member 20 (2). The heating medium V flows in from the heating medium inlet opening 34, descends, and exits from the heating medium outlet opening 36.

  Between the second heat exchange plate member 20 (2) from the left in FIG. 7 and the third heat exchange plate member 20 (3), the heated fluid F flows from the heated fluid inlet 30. And then exits from the heated fluid outlet opening 32. The heated fluid F flowing out of the heated fluid outlet opening 32 enters the heat treatment pipe 50. Since the heat treatment pipe 50 does not have a heating function, the temperature of the heated fluid F decreases.

  The to-be-heated fluid F is heated to a temperature higher than the desired heat treatment temperature by the food process heat exchanger 10, and the temperature is controlled so as to reach the desired heat treatment temperature when flowing out of the heat treatment pipe 50. As a result, the heat-treated fluid F has been subjected to a predetermined heat treatment at a desired heat treatment temperature over a period of time passing through the food process heat exchanger 10 and the heat treatment pipe 50.

F Heat treatment fluid V Heating medium 10 Food process heat exchanger 11 Peripheral piping 20 Heat exchange plate member 22 First gasket 24 Second gasket 30 Heat treatment fluid inlet opening 32 Heat treatment fluid outlet opening 34 Heating medium inlet opening 36 Heating medium outlet opening 39 Gasket grooves 42, 46 Diffusion corrugated grooves 44, 48 Concentrated corrugated grooves 50 Heat treatment piping

Here, the structural formulas of PPSU, PSU, and PESU are as follows.

Claims (2)

  A heat exchanger for a food process in which a metal plate is fixed at intervals, and the food is heat-treated by alternately circulating a heating medium and a food to be heated at a plurality of the intervals. The food process heat exchanger is characterized in that the surface in contact with food is coated with one of PPSU, PSU and PESU which are super engineering plastics of amorphous and sulfone resin.   A peripheral pipe of a heat exchanger for a food process that heats the food by fixing a metal plate at intervals and alternately circulating a food that is a heating medium and a fluid to be heated at a plurality of intervals. The surface of the plate in contact with the food is covered with one of PPSU, PSU and PESU which are super engineering plastics of amorphous and sulfone resin. Plumbing.