JPH0191818A - Continuous boiling apparatus - Google Patents

Abstract

PURPOSE: To prevent the degradation in the yield of effective components by providing a steam cooker with steaming pipes, steam ejection pipes having many steam ejection holes and plural partition plates, providing these steaming pipes with raw material delivery ports at points lower than the top ends of the steaming pipes and providing a the cooker with steam and froth discharge pipes. CONSTITUTION: When raw materials for tofu (soybean curd) are supplied to the steaming pipe 1, the raw material are sufficiently mixed in respective chambers 8 by the high-presser steam injected out of the steam injection holes 2. Further, the raw materials collide against the partition plates 5, by which the raw materials are diffused to be increased in the degree of mixing and are uniformly heated. The raw materials are thereafter supplied to the next steaming pipe through a connecting pipe 13 from the raw material delivery port 12. The froth (internal steam) generated from the raw materials is filled in the space above the liquid surface of the raw materials in the steaming pipe. The froth is discharged from the discharge pipe 16 and is condensed and discharged through a condenser 17. At this time, the formation and upward flotation of the froth consisting of the effective components, such as protein, contained in the raw materials are suppressed by the raw partition plates 5 to prevent the discharge of the effective components from the discharge pipes. The froth consisting of bitter components, such as saponin, has high stability and is, therefore, discharged and removed by floating upward.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a continuous steaming apparatus for high viscosity materials such as tofu raw materials and soups.

(Prior art and its problems) Gradually and uniformly heat-processing raw materials for tofu, such as mashed soybeans soaked in water, powdered soybeans, and compressed soybeans with water added, from room temperature to about 100°C. is generally called steaming.

Conventionally, many steaming or heating devices are used. For example, the device shown in Japanese Patent Publication No. 61-22940 is one such example, and the main component of this device is a screeny conveyor-like baffle plate, so that the raw material supplied to the steaming tube is It is transported with almost the same relationship, that is, without being subjected to stirring or mixing. As a result, there is a difference in the degree of steaming between the Kure near the steam cylinder and the Kure located further away, resulting in uneven boiling, making it impossible to obtain tofu with good texture and texture. Another disadvantage is that the inside of the steaming tube is a closed system, that is, the soybean outlet is located at the upper end, and there is no separate bubble tube, so bitter components such as saponin cannot be removed by generating and discharging bubbles. There is.

Further, in another conventionally known apparatus shown in Japanese Patent Publication No. 46-2391, since there is no baffle plate in the cylindrical pot, the raw materials supplied into the cylindrical pot are transported without being stirred or mixed at all. As a result, uneven heating occurs, causing uneven boiling, and the steam ejected from the steam jet pipe does not mix sufficiently with the raw material, forming bubbles, which float upwards and cause the air vent pipe to flow. There is a drawback that heating efficiency decreases because the gas is discharged through the gas.

The present invention was made in view of the current situation, and it eliminates uneven boiling in the device, removes bitter components in raw materials such as tofu, prevents oxidation and flavor deterioration of the raw materials, and improves steaming. It is an object of the present invention to provide a continuous steaming apparatus that can prevent the yield of active ingredients from decreasing due to overflow caused by a rise in temperature and an increase in the generation of bubbles as the process progresses.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the continuous steaming apparatus of the present invention includes a steaming pipe and a steam jetting pipe extending longitudinally inside the steaming pipe and having a large number of steam jetting holes. It has a vertical double structure consisting of a plurality of partition plates that are substantially perpendicular to the axis of the steaming tube and have cutouts in some parts, and are arranged so that the cutouts are in opposing positions to each other. The space between the pipe and the steam injection pipe is divided at approximately equal intervals, a raw material supply port is provided at the lower end of the steaming pipe, a raw material delivery port is provided a predetermined distance below the upper end of the steaming pipe, and water vapor and bubbles are provided. A discharge pipe is connected to the upper end of the steaming pipe.

(Example) A continuous steaming apparatus for tofu raw materials according to an example of the present invention will be described based on the drawings. A vertical cylindrical steaming pipe 1 having a top plate and a bottom plate has a steam jetting pipe 3 inside thereof along the same axis.
It has a double structure with The steam jet pipe has a large number of steam jet holes 2 on its outer peripheral wall.

The space between the steaming pipe 1 and the ejection pipe 3 is divided into a plurality of chambers 8, for example twelve, by a plurality of partition plates 5. Here, if the ratio between the arrangement interval of the partition plates 5 and the inner diameter of the steaming tube is set to 0.5:1 to 0.9:1, the stirring and mixing efficiency of the tofu raw materials can be increased. The partition plates 5 are provided substantially perpendicularly to the axes of both tubes and at substantially equal intervals. The jet pipe 3 passes through a hole 6 in each partition plate 5.

The partition plate 5 is a circular plate having an inner diameter equal to the inner diameter of the steaming tube 1, and is provided with a notch 7 cut into a straight line, as shown in FIG. The ratio of the cross-sectional area of the steaming tube 1 to the area of the notch 7 is 1:O.
, '05 to 1:0.25. As shown in FIG. 2, the notches 7 are arranged alternately from the top to the right, then to the left, so that the tofu raw material flows through the inside of the steaming tube by winding through the partition plate. Note that the cutout portion is not limited to a linear cutout in the disk, and may be formed by, for example, providing an eccentric circular hole in the disk.

The steam ejection pipe 3 passes through the bottom plate of the steaming pipe 1 and is connected to a steam supply pipe 4, from which steam is supplied. Also,
A raw material supply port 9 is provided in the bottom plate of the steaming tube 1, and raw materials for tofu are fed into the raw material supply port from a raw material pressure pump (not shown) through a supply pipe 11 and a three-way valve 10.

Furthermore, a raw material delivery port 12 is provided on the upper side surface of the steaming tube 1 . The raw material outlet 12 is located at a predetermined distance below the upper end of the steaming tube. As shown in FIG. 1, when a plurality of steaming tubes 1 are arranged side by side and connected in series, the above-mentioned predetermined distance increases as the working process becomes slower, that is, the later the process becomes. In addition, the height of the steaming pipe 1 and the above distances h1, h2, h
3. The ratio of h4... is 1:0.05 to 1:
Preferably it is 0.5. In FIG. 1, the process progresses from right to left toward subsequent steps. The raw material delivery port 12 is
It is connected to the raw material supply pipe 11 by a connecting pipe, that is, a raw material delivery pipe 13 .

A discharge pipe 16 is connected to a hole provided in the top plate of the steaming pipe 1, and water vapor and bubbles discharged from the upper part of the steaming pipe are discharged from the discharge pipe 1.
6 and is condensed and discharged. Part 1! A cooling water supply pipe 1 for condensation is installed in the upper part of the condenser 17.
4 are connected.

The continuous steaming apparatus of the present invention having the above structure operates as follows. In the continuous steaming apparatus shown in the drawing, four steaming tubes 1 are arranged side by side, and the raw material supply tubes 11 are connected in series through a three-way valve provided for each steaming tube. Further, the discharge pipes 16 are also connected in series for all the steaming pipes.

Steam supplied by the steam supply pipe 4 is ejected from the steam jet pipe 3 into the inside of the steaming pipe 1 to raise the inside temperature to a predetermined temperature. This temperature setting is performed by a solenoid valve installed in the middle of the steam supply pipe 4, which opens and closes in response to an operation signal from a separately provided temperature control device.

The raw material for tofu is fed from the raw material pressure pump to the three-way valve 10 of the first steaming pipe, as shown by arrow A in FIG. The three-way valve is adjusted to open the upper port, open the inlet lateral port, and close the outlet lateral port. As a result, the raw materials are supplied to the steaming pipe 1, where they are thoroughly mixed in each chamber 8 by the force of the pressure pump from below and the high pressure steam injected from the steam injection holes 2, and further After colliding with the partition plate 5, being diffused and increasing the mixing degree, and as a result, being heated uniformly over the entire area, the raw material is transferred to the raw material delivery port 12 as shown by the arrow.
From there, it passes through the connecting pipe 13, passes through the next three-way valve, and is supplied to the next steaming pipe.

At this time, the liquid level of the raw material in the steaming tube is almost at the lower end of the raw material outlet 12, and the space above the liquid level is filled with bubbles (internal steam) generated from the raw material, and these bubbles are caused by overflow. Due to this phenomenon, it is discharged from the discharge pipe 16 as shown by the arrow C, and is condensed and discharged through the condenser 17 as shown by the arrow. Note that the temperature rise of the tofu raw material is, for example, 50°C, 75°C, 90°C, and 100°C at each position when measured at the raw material outlet of the first to fourth steaming tubes.

As mentioned above, the raw materials are continuously heated and heated in each steaming tube.
The raw material, which is steamed, pressure-fed, and finally uniformly heated to approximately 100°C, is transported to the next okara/soy milk separation process, etc., as shown by arrow E. In this way, gou can be steamed continuously.

(Effects of the Invention) The continuous steaming apparatus of the present invention having the configuration as described above has the following effects.

In each chamber divided by the partition plate, the raw material already present in the chamber is stirred by the raw material and jetted steam pumped from the notch of the partition plate, and steaming is performed evenly and sufficiently. This has the effect of preventing uneven cooking. In addition, the partition plate prevents the ejected steam from forming bubbles and floating above the steaming tube, and the steam and raw materials are sufficiently contacted and mixed, thereby improving heating efficiency.

Further, the partition plate suppresses the formation and upward floating of bubbles consisting of active ingredients such as proteins contained in the raw materials (soy milk, soy milk, soybean paste), and prevents the active ingredients from coming out of the drain pipe. Since the bubbles made of bitter components such as saponin are highly stable, the partition plate does not prevent them from floating upward and being discharged, so that the bitter components can be effectively removed.

By providing the raw material outlet at a predetermined position, a predetermined space is formed above the raw material in the steaming tube, and by creating bubbles in this space, the degree of contact between the outside air and the raw material is reduced, and the oxidation and flavor of the tofu raw material are reduced. It has the effect of preventing deterioration.

In order to solve the conventional drawbacks that as the steaming of raw materials progresses, the temperature rises, the generation of bubbles increases, and overflow occurs, which reduces the yield of active ingredients. Since the position of the raw material delivery port is set low, that is, the volume in which bubbles can exist is increased, overflow does not occur, and therefore, the yield does not decrease.

[Brief explanation of the drawing]

FIG. 1 is a front view of the continuous steaming apparatus of the present invention, FIG. 2 is a partially sectional side view of the same, and FIG. 3 is a plan view of a partition plate. 1... Steaming pipe 2... Steam jetting hole 3... Steam jetting pipe 4... Steam supply pipe 5... Partition plate 6... Hole 7... Notch 8...Chamber 9...Raw material supply port 10...Three-way valve 11...Raw material supply pipe 12...Raw material outlet 13...Connecting pipe 14...・Cooling water supply pipe 16... Discharge pipe 17... Condensing pipe Figure 1 Figure 2

Claims (2)

[Claims] (1) A vertical double-structured continuous steaming device consisting of a steaming pipe (1) and a steam jetting pipe (3) extending longitudinally inside the steaming pipe and having a large number of steam jetting holes (2), A plurality of adjacent partition plates (5) each having a notch (7) in a part and substantially perpendicular to the axis of the steaming tube are arranged so that the notches face each other. The space between the pipe (1) and the steam jetting pipe (3) is divided into approximately equal intervals, the raw material supply port (9) is provided at the lower end of the steaming pipe (1), and the raw material delivery port (12) is provided at the lower end of the steaming pipe (1). A continuous steaming device, characterized in that it is provided a predetermined distance below the upper end of the steaming pipe (1), and a steam and foam discharge pipe (16) is communicated with the upper end of the steaming pipe (1). (2) A plurality of the steaming pipes (1) are connected in series, and the steaming pipes (1) are
1) The continuous steaming apparatus according to claim 1, wherein the continuous steaming apparatus is arranged so as to be gradually lower than the upper end.