JPS63141557A - Boiling and aging of beans by indirect heating and apparatus therefor - Google Patents

Abstract

PURPOSE:To sanitarily boil and age beans without shape collapse in boiling, etc., by passing heated water for boiling and heating in a cooker through a circuit having a heat exchanger by steam heating provided on the outside of the cooker, heating the water, boiling and aging the beans by steam heating from the outside of the cooker and heated water, circulated and fed into the cooker. CONSTITUTION:Beans 9 in a cooker 1 are heated by a heat source 4 from the outside of the cooker and heated water for boiling and aging in the cooker is led out of the interior of the cooker to a heat exchanger 10 through a circuit 3 connecting the interior of cooker to the heat exchanger 10, heated by the heat exchanger 10 and then reintroduced into the cooker to boil and age the beans by heated water for boiling and aging heated on the outside of the cooker by a heating heat source 4 on the outside of the cooker and the circuit 3. As a result, problems, e.g. shape collapse in boiling, surface burn, etc., are not caused by temperature conditions suitable for boiling and aging the beans as compared with those of conventional methods for heating and boiling beans by directly blowing in steam and the beans can be sanitarily boiled and aged without an influence of impurities contained in vapor, e.g. antiscales, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and apparatus for boiling beans as raw materials for producing bean paste.

[Conventional technology]

Conventional methods for boiling beans, which are raw materials for making bean paste, include heating the beans stored in a pot with a double pot jacket from outside the pot using high-temperature steam introduced into the jacket, and heating the beans inside the pot. On the other hand, a common method is to boil the rice in combination with heating from within the pot using high-temperature steam directly fed into the pot. In addition, as a heat source for internal heating supplied to the inside of the pot, an electric heater was installed at the bottom of the pot to enable automatic boiling operation at night, along with the steam jet pipe for supplying steam. (For example, Japanese Patent Publication No. 60-149353, Japanese Utility Model Publication No. 1169/1983)
No. 33).

[Problem that the invention seeks to solve]

As mentioned above, in the conventional method of boiling beans of this type, in addition to the basic heating method of applying a heat source to the beans in the pot from outside the pot, steam is blown directly into the pot to provide a heating effect. Because it uses a direct heating method to promote the boiling process, there are some unreasonable points in the boiling process, and as a result, there are some problems with the quality and yield of the final product. There is.

The first problem is the problem with product quality when the steam obtained by the boiler is used to directly heat pulses. Generally, the steam obtained from a boiler has a gauge pressure of 5 to 7 kg/an! Q, saturated steam temperature 158 to 1
Since the steam is heated at a high temperature of 69°C and high pressure, it cannot be used as is for boiling food as it is too hot. Therefore, in the past, this heated steam was pumped through a pressure reducing valve to reduce the amount of steam to 2 to 3 kg, which would not interfere with the continuous operation of the boiler.
/cn! With the pressure and temperature reduced to around G and saturation temperature of about 133 to 143 degrees Celsius, live steam is directly ejected from an annular steam injection pipe placed in the pot, thereby shortening the boiling time. .

By the way, boiling beans means gelatinizing the starch in the beans, and the temperature required to cause this gelatinization is about 75°C. In other words, in order to boil beans, a temperature of about 75°C is sufficient, whereas when using the direct heating method described above, 2 to 3 kg/kg
The beans are brought into direct contact with high-temperature steam heat of about cnlG, about 133 to 143°C. In this case, the beans stored in the boiling bean tube inside the pot are boiled first starting from the outer periphery of the basket, and there is a large temperature difference before the heat is transferred to the beans located deep inside the basket. As a result, the beans on the outer periphery are constantly exposed to the above-mentioned high-temperature steam until the beans in the inner part are boiled, resulting in them collapsing. .

Naturally, as the beans in the outer periphery are exposed to higher-temperature steam than necessary, the beans in the outer periphery become "
In addition to the phenomenon of "boiling down", "surface burns" and "scorching",
A characteristic change called ``starch gelatinization'' occurs, and beans that have been deformed in this way can no longer be used as commercial products, resulting in a problem in that the product yield is significantly reduced.

The second problem is food hygiene when the steam obtained by the boiler is directly blown into the pot for heating. In other words, as is well known, the water injected into the boiler is treated with a deoxidizing agent that turns hard water into soft water and prevents deterioration of iron heat exchangers and prevents scale buildup. Can cleaning agent is usually highly alkaline water with a pH of PHII to 13, so when boiler water mixed with this can cleaning agent is vaporized and used for steaming food, the highly alkaline water will directly adhere to the food. This will significantly affect the quality of the food. In addition, this can cleaning agent not only affects the quality of food, but also contains a trace amount of heavy metal substances that are harmful to the human body, so it is undesirable from a food hygiene perspective.

[Means for solving problems]

In order to solve the problems caused by the conventional one-gas direct heating method when boiling beans as raw materials for making bean paste, the present invention aims to heat the beans by blowing high-temperature steam obtained from a boiler directly into the pot. It is not used as a heat source, but is used as a heating heat source for a heat exchanger installed in a container, and beans are boiled with heated water that does not contain impurities such as can cleaning agents and has a temperature suitable for gelatinizing beans. The purpose of this invention is to provide a method for boiling beans that has a high product yield and is free from hygienic problems, as well as an apparatus for the same.

As a method for boiling beans as described above, the present invention specifically heats beans in a pot using a heat source from a container, and also provides a circulation path connecting a heat exchanger provided in the container and the inside of the pot. According to
The heated water for boiling in the pot is led out from the pot to the heat exchanger, heated by the heat exchanger, and then introduced into the pot again, and heated by the volumetric heating heat source and the circulation path. This method is characterized in that beans are boiled using heated water for boiling that has been heated by water.

[Effect]

In the boiling method according to the present invention, the beans in the pot are heated by the heat source due to the capacity of the double pot jacket at the bottom of the pot, and the heated water for boiling stored in the pot is heated through the outlet path. It is also heated by circulating heated water, which is then sent to a capacitive heat exchanger and then reintroduced into the pot through an introduction path in a capacitively heated state. Therefore, in this invention, the high-temperature steam obtained by the boiler is used as a heat source from the capacity of the double boiler jacket and as a heat source for heating the heat exchanger, but it is also directly introduced into the boiler and used to heat the pulses. It is not used as a heat source for heating. Therefore, the beans in the pot are constantly subjected to circulating heat convection of heated water heated to temperature conditions suitable for gelatinization by a heat exchanger, allowing them to gelatinize without suffering high-temperature problems such as "surface burns." In addition to being easy to promote, there are no food hygiene problems caused by boiler water containing can cleaning agents.
It can be processed with good yield under appropriate boiling conditions.

〔Example〕

Next, the method of boiling beans according to the present invention will be explained with reference to the boiling apparatus shown in the attached drawings. The boiling device shown in the drawings consists of a pot l having a double pot jacket part 2 at the bottom, and a circulation path 3 with a heat exchanger installed outside the pot l.

Inside the double pot jacket part 2 provided at the bottom of the pot 1,
High-temperature steam that has been appropriately depressurized from the boiler 4 is introduced from the supply path 5 as a heating heat source from the volume, and a hollow heating column 6 extends from the center of the jacket part 2 toward the upper part of the inside of the pot. The heated steam inside the jacket part 2 does not flow out from the heating column 6 to the outside, that is, into the pot, and the heat is transferred from the inside of the heating column 6 to the beans in the center of the pot. The beans M9 in the pot 1 are accommodated in a bean boiling basket 7 having an insertion hole 8 for the heating column 6, and placed in the pot 1.

On the other hand, the circulation path 3 includes a heat exchanger 10 placed outside the pot 1,
A pump lla for sending boiling heated water 23 stored in the pot 1, which will be described later, from the bottom of the pot toward the heat exchanger 10.
It consists of an outlet passage 11 having a diameter of 100 degrees, and an introduction passage 12 through which heated water 23 in the heat exchanger 10 is sent out into the pot 1.

This heat exchanger 10 has a drum-shaped jacket 13 in which both 113a and 13b are closed, and a large number of four pipes 14 for heated water are arranged through the drum-shaped jacket 13, and an electric heater is installed inside the lower end of the jacket 13. A storage chamber 16 is provided, which is connected to the outlet passage 11 which can be removed to the outside as needed, and a storage chamber 17 is provided at the upper end, which is connected to the introduction passage 12 which conducts into the pot l. are provided for each. Note that the valley side connection end 12a of the introduction path 12 is provided at a position eccentric to the center of the pot 1, as shown in FIG. 2, and is introduced into the pot 1 through the introduction path 12. Cyclone flow along the inner wall of the pot 1 is applied to the heated water 23.

Inside the jacket 13 of the heat exchanger 10 is a boiler 4.
Electromagnetic valves 18a, 18 branched from the supply path 5 from
High-temperature steam is introduced through a branch pipe 18 having a pipe 18, and this steam is discharged to the outside through a discharge pipe 19. Note that the end of the outlet passage 11 connecting the heat exchanger 10 and the inside of the pot 1 on the pot side is connected to a connecting pipe 20 that passes through the double pot jacket bottom part 2 of the pot 1 and connects the inside and outside of the pot. There is.

On the other hand, inside the pot 1 is a water supply channel 22 led out from a water supply source 21.
is connected to the pot-side end of the outlet path 11 in the circulation path 3, and a predetermined amount of heated water 23 for boiling is supplied into the pot 1 through this water supply channel 22. The amount of heated water 23 supplied into the pot 1 is determined by a sensor 25b with an upper limit water level and a lower limit water level, which are branched from the water supply channel 22 and arranged to have the same height as the inside of the pot 1. The water level is measured by a water level gauge 24 provided. Further, a branch path 28 is connected from the water supply channel 22 to a shower nozzle 27 provided in a lid 26 of the pot 1 .

In addition, 29 in the figure is a temperature display meter that displays the temperature sensor 30 of the heated water 23 in the pot l and the temperature of the electric heater 15 of the heat exchanger 10.

The raw beans 9 stored in the pot 1 are washed to remove dirt, pebbles, etc., and then immersed in a water tank for a certain period of time to undergo pretreatment to increase the moisture content of the epidermis and promote gelatinization of starch. This soaking process may be performed by injecting a predetermined amount of water into the pot 1 from the water supply channel 22 while the beans 9 are placed in the bean boiling basket 7 in the pot.

After the soaking process is completed, high-temperature steam is supplied from the boiler 4 to the double pot jacket part 2 of the pot 1 and the jacket 13 of the heat exchanger 10, and the beans 9 in the pot 1 are soaked in the double pot jacket part 2 and Heating is performed from the heating column 6. At that time, heated water is also stored in the outlet path 11 in the circulation path 3 and the vibrator 14 of the heat exchanger IO, and the pump lla in the outlet path 11 is activated at the same time as the start of steam heating from outside the pot. The heated water 23 inside is sent into the heat exchanger 10 through the outlet path 11 and heated within the heat exchanger 10.

The heated water heated by the heat exchanger IO returns into the pot 1 through the introduction path 12, and heats the beans in the pot from the inside as well.

The temperature inside the pot rises to about 85 to 93 degrees Celsius due to the heating from outside the pot by the double pot jacket part 2 and the heating column 6, and the circulating heating of heated water from inside the pot by the heat exchanger 10. After that, this temperature condition is maintained for 15 to 20 minutes. This set temperature condition is maintained by cutting off the steam supply to the double kettle jacket part 2 and the heating column 6, and using only the heated water 23 by the heat exchanger IO in the circulation path 3. Further, this temperature maintenance is performed by appropriately opening and closing electromagnetic pulps 18a and 18b provided in a steam branch pipe 18 connecting the boiler 4 and the heat exchanger 10.

After the temperature holding step is completed, the steam supply to the heat exchanger 10 is cut off, and the outlet path 1 in the circulation path 3 is closed.
Open the valve llb provided at one end of the pot 1 to discharge all the heated water 23 in the pot 1 and the heated water 23 in the circulation path 3, and with the pulp in the water supply channel 22 closed, connect the branch channel 28 from the water supply source 21. Water is then supplied to the shower nozzle 27, and the beans 9 in the pot 1 are cleaned with shower water.

Pre-cooking is completed by the completion of this astringent cutting process, so
Next, move on to cooking. In this main cooking process, similarly to the pre-cooking process, heated water is stored in the pot and the circulation path, and then the double pot jacket part 2 and the circulation path 3 are heated with steam from the boiler 4. After heating to 85 to 93°C, a steaming process is performed for 15 to 20 minutes. Note that the electric heater 15 provided in the heat exchanger 10 is used for unmanned automatic operation at night.

〔effect〕

As described above, the method of boiling beans according to the present invention heats the heated water for boiling in the pot through a circulation path equipped with a heat exchanger using steam heating provided outside the pot. The beans are boiled and ripened using heated water that is circulated inside the pot.
Compared to the conventional method of heating and boiling by blowing steam directly into the boiler, the temperature conditions suitable for boiling beans eliminates problems such as streaks and surface burns, and the steam used for can cleaning agents, etc. It can be boiled hygienically without being affected by impurities contained in
Since the heating is not done by direct steam, the beans can be cooked to a ripe state without any streaks or surface burns, which greatly improves product yield compared to conventional direct heating methods, resulting in better product quality. This has the effect that it is possible to obtain raw materials for making bean paste.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the configuration of a boiling device used in the boiling method according to the present invention, and FIG. 2 is a cross-sectional view taken along the line ■-■ in FIG. 1: pot, 2: double pot jacket part, 3: va
Ring path, 4: Boiler, 6: Hollow heating column, 7:
Bean boiling basket, 9: Bean, 1O: Heat exchanger, 11: Outlet path, 12: Jinjin path, 18: Branch pipe, 21: Water supply source, 21: Water supply channel, 23: Heated water for boiling, 24: Water level gauge, 27: Shower nozzle.

Claims (7)

[Claims] (1) The beans in the pot are heated by a heat source from outside the pot, and the heating water for boiling in the pot is heated from inside the pot by a circulation path connecting the heat exchanger installed outside the pot and the inside of the pot. The beans are led out to an exchanger, heated by the heat exchanger, and then introduced into the pot again, using the heating heat source outside the pot and the heated water for boiling heated outside the pot through the circulation path. A boiling method that involves indirect heating of beans. (2) Heated water for boiling that is heated by the heat exchanger in the circulation path and returned to the pot is introduced into the pot so that a cyclone flow is applied along the inner wall of the pot. A method of boiling beans by indirect heating according to claim 1, wherein heat convection of heated water is generated. (3) Heating of the beans in the pot by a heat source from outside the pot is provided by a double pot jacket and a hollow heating column protruding from the center of the pot so as to communicate with the jacket. A method of boiling beans by indirect heating according to claim 1. (4) A pot with a double pot jacket, and the heated water in the pot is sent from the bottom of the pot through a lead-out path into a heat exchanger placed outside the pot, and the heated water is heated by the heat exchanger. A boiling device for indirect heating of beans, comprising a circulation path for heating water outside the pot through which heated water is sent into the upper part of the pot via an introduction path. (5) The legumes according to claim 4, wherein the in-pot connection port of the introduction path for feeding the heated water heated by the heat exchanger into the pot is provided toward an eccentric part in the pot. A boiling device using indirect heating. (6) Indirect heating of legumes according to claim 4, wherein the heat exchanger comprises a jacket section using high-temperature steam as a heat source, and an electric heater detachably attached to the lower end of the jacket section as necessary. boiling device. (7) An indirect method for producing legumes according to claim 4, which has a hollow heating column that protrudes from the center of the double pot jacket section toward the center of the pot so as to communicate with the jacket section. Boiling device by heating.