JPH03221756A - Indirect heating device - Google Patents

Abstract

PURPOSE:To permit a uniform and efficient indirect heating even of a highly viscous liquid without causing burning by a method wherein a passage for heating medium is formed in a space between an inner and an outer cylinder, a series of axially twisted plate-like members are provided in the inner cylinder and the fixed stirring mechanisms with these plate-like members arranged in coaxial out-of-phase relationship are provided. CONSTITUTION:Each of the units 5 composing an indirect heating device 4 consists of an inner cylinder 6 through which the liquid to be treated is passed and an outer cylinder 7 provided covering the inner cylinder in spaced relation to its outer periphery and coaxially thereof. The inner cylinder 6 is provided in its interior with a passage 604 for passing therethrough the liquid under indirect heat treatment throughout the length of the inner cylinder and coaxially thereof and this passage 604 is provided with a fixed stirring mechanisms 8 in its interior. The fixed stirring mechanism 8 is formed into on axially twisted blade 801 by turning a plate-like body through 90 deg. about its central part 802. A series of such blades 801 are fixedly and coaxially arranged in the passage 604 of the inner cylinder 6 with the ends of the blades kept in contact with one another, These blades 801 are also arranged in the passage 604 along the nearly entire length thereof in 90 deg. out-of-phase relationship between each adjacent blade.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an indirect heating device used for sterilizing or denaturing liquids.

[Prior art] As a heat treatment device for the purpose of sterilizing or denaturing highly viscous liquids such as concentrated fish extract, soy milk, or brewing stocks,
BACKGROUND ART Conventionally, liquids have been heat-treated by combining indirect heating devices using heat exchangers and direct heating devices that bring water vapor and liquid into direct contact.

In the above heat treatment method, a plate heater type heat exchanger is mainly used as the indirect heating device.

[Problems to be Solved by the Invention] In the plate heater type heat exchanger constituting the indirect heating device used in the above-mentioned prior art, the liquid flows between the beat plates in a layered manner, so that the contact between the outer layer and the plate is reduced. There is a tendency for liquid to be exchanged between the central part and the central part, and this tendency is particularly strong for highly viscous liquids.

For this reason, the outer layer that comes into contact with the liquid plate is constantly exposed to high temperatures, and it is necessary to prevent scorching or excessive heating to prevent scorching, and there is a limit to the heating temperature. child .

Therefore, the heating burden on the second-stage direct heating means provided downstream of the indirect heating device increases, and the amount of water vapor condensed also increases, resulting in a disadvantage that the water content of the treatment liquid tends to increase.

The present invention has been made to solve the above problems, and its purpose is to
It is possible to efficiently perform indirect heat treatment without scorching of the processing body and without five layers of processing liquid.By combining this with a direct heat treatment device, the heating burden on the direct heating device is reduced and the liquid can be sterilized. An object of the present invention is to provide an indirect heating device suitable for use in a heat treatment device for carrying out denaturation, etc.

[Means for Solving the Problems] A means for solving the problems described above includes an inner cylinder through which the liquid to be heated is allowed to flow, and an outer cylinder provided to surround the outer circumference of the inner cylinder at a distance. A heating medium passage is formed in the space between the inner and outer cylinders, and a plurality of plate-like members twisted in the axial direction are arranged in series inside the inner cylinder, and each plate-like member is arranged in phase in the axial direction. This is an indirect heating device equipped with a staggered fixed stirring mechanism.

[Effect by the above means] According to the above means, the liquid flowing into the indirect heating device is heated by a fixed stirring mechanism in the flow path, that is, a plurality of fixed stirring mechanisms twisted in the axial direction and provided with a phase shift in the axial direction. It is stirred by a plate-shaped member, and the i & body is heated by uniform heat exchange in each part, and since it does not form a laminar flow, the outer layer is prevented from getting frizzy, and efficient heating is achieved.[Example] 1st The figure is a longitudinal sectional side view of the indirect heating device according to the present invention, FIG. 2 is a side view of the plate-shaped member fJi that connects the fixed stirring mechanism 11+4, FIG. 3 is a plan view of the same plate-shaped member alone, and FIG. 4 5 is a schematic explanatory view of a heat treatment apparatus incorporating the indirect heating apparatus according to the present invention, and FIG. 5 is a longitudinal sectional view showing an example of a direct heating apparatus used in the heat treatment apparatus.

The indirect heating device 4 is as shown in FIGS.
The figure shows a single unit 5 of the indirect heating device 4. The indirect heating device 4 is used, for example, in a heat treatment device for limbs as shown in FIG. The liquid is pumped in.

As shown in FIG. 1, the unit 5 constituting the indirect heating device 4 consists of an inner cylinder 6 through which a processing liquid flows, and an outer cylinder 7 that is provided concentrically and covers the outer circumference of the inner cylinder 6 at a distance. Flanges 6 are attached to the end faces of both axial ends 601 and 602 of the inner cylinder 6.
03, 603 are provided, and the units 5 are arranged in parallel as shown in FIG. Communicate through the connection.

A closing lid 701702 is provided at both ends of the outer cylinder 8 in the axial direction, and the closing lid 701y702 is provided at both ends 601, 6 of the inner cylinder 6.
provided so as to extend radially outward from the outer periphery of 02,
As a result, an airtight indirect heating medium passage 703 is formed between the outer periphery of the inner cylinder 6 and the inner periphery of the outer cylinder 7, and this passage 703 is formed in a ring shape so as to surround the outer periphery of the inner cylinder 6. Ru.

An artificial part 704 for the indirect heating medium is provided on the earthen wall of the outer periphery of one end of the outer cylinder 7, and an outlet part 705 thereof is provided on the lower wall of the outer periphery of the other end. An indirect heating medium flows into the passage 703 from the artificial part 704, and the medium passes through the passage 703 and flows out from the outlet part 704. When the unit 1-5 is connected as shown in FIG. The indirect heating medium flows from the unit to the downstream unit, and the passage 703 of each unit 5... is the inlet part 704 of the downstream one.
and the outlet section 705 of the upstream one are respectively connected to communicate with each other.

A passage 604 for the indirect heat treatment liquid is provided in the inner direction 6 over the entire length in the axial direction, and a fixed stirring mechanism 8 is provided within this passage 604. The fixed agitation mechanism 8 is as shown in FIG. 2, and is formed by twisting a plate-shaped body 900 degrees around a central portion 802 to form a blade body 801 that is spiral in the axial direction. A plurality of these wing bodies 801 are prepared, and these wing bodies 801... are connected to the passage 6 of the inner cylinder 6.
04, a plurality of them are fixedly disposed in series in the axial direction so that their respective ends are in contact with each other. The fixed blade bodies 801 arranged in series are arranged so that adjacent ones are shifted in phase by 90', and are arranged over substantially the entire length of the passage 604.

The fixed stirring mechanism 8 is configured as described above.

The unit 5 is arranged as follows (7) and the indirect heating device 4 of the liquid heat treatment apparatus as shown in FIG. 4 is installed at the bottom of the tank.

That is, as shown in FIG. 4, a plurality of units 5... are prepared, the units 5... are inverted, and the artificial part 704 of the indirect heating medium is connected to the outlet part 705 on the upstream side. 705 is connected to the person [1 section 704 on the downstream side thereof, the population section 704 of the final stage unit 5B is connected to the indirect heating medium supply line 10, and the outlet [1
The section 705 is connected to the IJI outlet line 11 of the indirect heating medium. Both ends of the inner cylinder 6 of each unit are connected to the sacrum 9 of U-shape (°2) as described above, and the inner cylinder 6 of each unit 5 is connected in communication. be done.

The indirect heating medium used in the indirect heating device 4 described above is 1
0 For example, hot water, steam, etc. are used.

Outer r8 of the final stage unit 5B from line 10 in Figure 4
Since the passages 703 of each unit 5... are connected at each entrance/exit part, the medium flows through each passage, and the medium flows through the outlet of the -th unit 5A. The iJI is outputted from the section 705 to the line 11, thereby heating the inner cylinder 6 with the medium and indirectly heating the liquid flowing inside the inner cylinder 6.

The processing liquid pumped from the pump 2 flows into the inner cylinder 6, and the processing liquid flows in the passage 604 in the inner cylinder 6 from upstream to downstream. As mentioned above, the fixed agitation mechanism 8 is provided in the passage 604, and the fixed agitation mechanism 8 moves the plurality of blade bodies 801 twisted by 900 degrees out of phase with each other into the passage 6-. 4 are arranged adjacent to each other in series in the axial direction,
Therefore, the pumped inflow 1. The liquid flow is twisted by the fixed wing body 801, and the next downstream stage is out of phase by 90 degrees, so it is divided and twisted, and this is repeated sequentially to efficiently It is sent downstream while being agitated. Therefore, the liquid flow does not become a laminar flow, and moves while being in contact with the inner wall 605 of the inner cylinder 6 while being stirred at each of the outer layer, middle layer, and inner layer without any speed, and efficiently exchanges heat and is heated. It happens.

In addition, by selecting the number of blades 801 that form the stirring mechanism at the bottom of the tank, etc., it is possible to set the heating under optimal conditions according to the physical properties of the liquid.

By the way, to further explain the heat treatment apparatus in which the indirect heating apparatus 4 according to the present invention is used according to FIG. A temperature sensor 14 is provided upstream of the temperature sensor 12, and information from the sensor 14 is inputted to a thermocontroller 15, and the control valve 13 is opened or closed by a diaphragm 131, for example, according to the judgment of the controller 15.
I control or open/close adjustment to control the flow rate, adjust the supply amount of the medium, and adjust the heating temperature to 1. do the same thing.

A direct heating device 16 is provided downstream of the indirect heating device 4 described above, and they are connected to each other through a connecting pipe 12.

For example, the direct heating device 16 shown in FIG. 5 is used.

The direct heating device 16 includes a main body 17 made of a pipe through which preheated liquid flows, and connection flanges 171 and 172 to connecting pipes at both axial ends of the main body 17.

On the main body 17, there is provided a water vapor distribution chamber 18 consisting of a pipe body with both ends closed in parallel, and a direct heating medium section 181 such as saturated steam is provided on the upper wall of one end of the chamber, and a direct heating medium section 181 such as saturated steam is provided at the inlet end. A connecting flange 182 is provided. The bottom wall 184 of the tube 183 forming the distribution chamber 18 and the top wall 17 of the main body 17
3. Connect with multiple introduction vibrators 19...
The vibrator 19 has a small diameter and is inclined in the direction in which the limb flows, that is, from left to right in the figure, since the liquid flows in this direction, and the vibrators 19 are parallel to each other. The upstream end 174 of the main body 17 is connected to the downstream end of the communication pipe 12 described above, and the liquid subjected to the indirect heat treatment described above flows into the passage 175 of the main body 17 and connected to the connecting pipe 20 connected to the downstream end 176. It is discharged into the hold tube 21 via.

By the way, from the inlet section 181 through the supply line 22,
For example, saturated steam is supplied into the distribution chamber 18, and the distribution chamber 1
Saturated water vapor is introduced into the passage 175 from 8 through the vibrator 19, and the direction of the water vapor jetting out is inclined in the forward direction with respect to the flow direction of the liquid, so that the water vapor is efficiently mixed into the liquid. , efficiently heats liquids.

Note that a control valve 23 is provided in the supply line 22, and a filter 24 is provided upstream of the valve 23. Then, the temperature of the liquid after the heat treatment immediately after flowing out from the direct heating device 16 is
The information is detected by a sensor 25 installed in the connecting pipe 20, and the information is input manually to the thermo controller 26, and the control valve 23 is controlled to open and close using a diaphragm 231, for example, or the opening degree is adjusted to control the flow rate, thereby controlling the supply amount of the heating medium. The heating temperature is controlled by adjusting the

Processing liquid transport line 27 for the hold tube 21 described above
The downstream end of this line 27 is connected to an indirect cooling device 28.
The cooling device 28 has a similar structure to the indirect heating device 4, and circulates cold water or the like between the inner cylinder 29 and the outer cylinder 30 surrounding it to cool the heated liquid being transported. do. At the downstream end of the indirect cooling device 28, a final transport line 3 is provided.
1 is connected, and the line 31 is connected to the product storage tank 32. A pressure sensor 33 is installed in the line 31 to detect the transportation pressure of the liquid, and if necessary, the pressure controller 3
4, the control valve 35 provided downstream of the sensor 33 is adjusted. Then, by setting the pressure in the processing line appropriately higher than the evaporation temperature in the direct heating device using the pressure controller 34, boiling of the processing liquid in the line can be prevented.

As described above, a liquid heat treatment line was constructed.

[Effects of the Invention] As is clear from the above, according to the present invention, when indirectly heating a highly viscous liquid, the indirect heating device has a fixed stirring mechanism (liii) in the liquid circulation path. In this method, a plurality of twisted plate members are arranged in series in the axial direction, and the plate members are arranged out of phase with each other, so that the liquid flowing under pressure into the passage is twisted by the plate members, and the phase of the liquid downstream is shifted. Therefore, the liquid does not become a laminar flow, and the outer layer, middle layer, and inner layer are agitated without any speed, and are in contact with the inner wall of the inner cylinder that forms the passage. The liquid can be moved and heated through efficient heat exchange.
Efficient indirect heating can be achieved evenly in each part without burning, and the above can be done by simply installing twisted plate-like members in the pipe-like inner cylinder in a row in the axial direction with different phases. Therefore, it has many advantages such as the above-mentioned revolutionary advantages with a simple structure.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a longitudinal cross-sectional side view of an indirect heating device according to the present invention, FIG. 2 is a side view of a plate member 111 constituting a fixed stirring mechanism, and The figure is a plan view of the same plate-shaped part 14 alone, Figure 4 is a schematic explanatory diagram of the heat treatment equipment incorporating the indirect heating device for unexploded 1jJJ, and Figure 5 is the direct heating used in the same heat treatment device. FIG. 2 is a vertical cross-sectional view showing an example of the device. In the drawing, 4 is an indirect heating device, 5 is a 41 unit thereof, 6 is an inner cylinder, 605 is a liquid passage, 7 is an external heating device, 70
5 is an indirect heating medium passage, 8 is a fixed stirring mechanism, and 801 is a plate-like portion.

Claims (1)

[Claims] It consists of an inner cylinder that allows the liquid to be heated to flow through it, and an outer cylinder that is provided to surround the outer periphery of the inner cylinder at a distance, and a heating medium passage is formed in the space between the inner and outer cylinders. , constituted by a plurality of plate-like members twisted in the axial direction, and
An indirect heating device characterized by being provided with a fixed stirring mechanism in which each plate member is shifted in phase in the axial direction.