JP2000074307A - Manufacture of normal pressure superheated steam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently raise steam at its temperature by heating water at a normal pressure to generate the steam, mixing combustion gas with the steam, and superheating the steam. SOLUTION: A normal pressure steam generator 1 is connected to a cooker 3 via a steam passage 4. A fan 5 is provided at the passage 4. The generator 1 heats water at a normal pressure by an electric heater, a gas combustion or the like to generate steam, and sends the steam to the cooker 3. A combustion gas passage 6 for sending combustion gas from combustion equipment 2 is connected to a midway of the passage 4, and a fan 7 is provided at the passage 6. The combustion gas of the equipment 2 is sent into the passage 4 by the fan 7, and mixed with the steam to superheat the steam. Thus, normal pressure superheated steam can be obtained by suppressing a heat loss without using a pressure container or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for producing superheated steam at normal pressure.

[0002]

2. Description of the Related Art Superheated steam can be used as a heating means for sterilization, drying or cooking. In this case, if superheated steam at normal pressure is used, there is no need to use a pressure structure such as a high-pressure boiler or a high-pressure vessel, so that the equipment structure is simplified, safety is improved, and management is facilitated. Such normal pressure superheated steam is obtained by generating steam and then raising the temperature thereof.

[0003] Conventionally, in order to produce superheated steam under normal pressure, the steam has been heated to a high temperature using a heating device such as an electric heater to be superheated.

[0004]

However, in the conventional method of heating steam with an electric heater or the like, the efficiency of increasing the temperature of steam is low, and heat energy is not efficiently used for superheating, resulting in waste of energy.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-mentioned prior art, and has as its object to provide a method for producing superheated steam at normal pressure which can efficiently raise the temperature of steam with a simple structure.

[0006]

In order to achieve the above object, the present invention is characterized in that water is heated at normal pressure to generate steam, and the steam is mixed with a combustion gas to be superheated. Provided is a method for producing atmospheric superheated steam.

According to this configuration, the high-temperature combustion gas is mixed with the steam under the atmospheric pressure to raise the temperature of the steam, so that the heat energy of the combustion gas is efficiently used for superheating the steam, and the heat loss is reduced. Can be suppressed to obtain superheated steam at normal pressure.

In a preferred embodiment, the combustion gas is C
And H or a liquid or gaseous fuel or natural gas containing H.

According to this structure, ethyl alcohol (C
2H5OH), methyl alcohol (CH3OH), propyl alcohol (C3H7OH), butyl alcohol (C4
H9OH) and other fuels, such as propane (C3H8), butane (C4H10), and other liquid fuels, combustible gases, and natural gas containing hydrocarbons as the main component, and the combustion gas mixed with normal-pressure steam. The combustion gas contains almost only carbon dioxide (CO2) and water (H20), and therefore, there is no problem even if it is mixed with superheated steam.

[0010]

FIG. 1 is a configuration diagram of an embodiment of the present invention. In this embodiment, the steam generated by the normal-pressure steam generator 1 is heated to a high temperature by the combustion gas burned by the combustion device 2 to produce normal-pressure superheated steam, and the normal-pressure superheated steam is sent to the cooking device 4. It is used for various heating cooking. The atmospheric pressure steam generator 1 is connected to the cooking device 3 via the steam passage 4.
Connected to. A fan 5 is provided in the steam passage 4 to send steam to the cooking device 4. A combustion gas passage 6 for feeding combustion gas from the combustion device 2 is connected in the middle of the steam passage 4. A fan 7 is provided in the combustion gas passage 6 to feed combustion gas into the steam passage 4. As a result, the high-temperature combustion gas is mixed with the normal-pressure steam in the steam passage 4 to raise the temperature of the steam, thereby obtaining normal-pressure superheated steam.

The normal pressure steam generator 1 generates water vapor by heating water at normal pressure by an electric heater (not shown) or gas combustion.

The combustion device 2 burns a gas fuel or a liquid fuel containing C and H, such as alcohol, propane or natural gas. The combustion temperature is controlled by adjusting the fuel supply amount to be burned, so that the temperature of the superheated steam can be easily controlled. Further, since the inside of the steam passage 4 and the combustion gas passage 6 is at normal pressure, the combustion gas forms a rising airflow by erected the combustion gas passage 6 in the vertical direction, and the combustion gas is removed without using the fan 7. It is also possible to introduce into the steam passage 4.

FIG. 2 is a configuration diagram of another embodiment of the present invention. In this embodiment, the normal-pressure steam generator 1 and the combustion device 2 are connected to a mixing chamber 8, and the normal-pressure steam and the combustion gas are mixed in the mixing chamber 8 to produce superheated steam. The obtained normal pressure superheated steam is sent to the cooking device 3 by the fan 10 through the steam passage 9 and used for various heating and cooking. The other configuration and operation and effect are the same as those of the embodiment of FIG.

In the embodiment shown in FIG. 2, the combustion device 2 may be provided in the mixing chamber 8 to generate a combustion gas in a normal-pressure steam atmosphere.

In each of the above embodiments, the superheated steam at normal pressure is used for cooking, but it can also be used for a sterilizing device, a drying device for metal or the like, or for heating. If it is used as a sterilizer, it can sterilize or kill microorganisms and pests in a state where the air is shut off by covering the object of sterilization without leakage with water vapor. It can be used effectively.

[0016] In addition, the present invention can be applied to chicken eggs and cultural properties as a target of sterilization. By sterilizing the chicken eggs, Salmonella and the like can be quickly killed, and a remarkable effect on food hygiene can be obtained with a simple configuration. In addition, pests, their eggs, and the like can be killed by the sterilization treatment of cultural properties, and historical articles and the like can be protected.

[0017]

As described above, in the present invention, the superheated steam is produced by mixing the high-temperature combustion gas with the steam under the atmospheric pressure to heat the steam to produce superheated steam. Used for superheating of steam, it is possible to obtain normal-pressure superheated steam with a small heat loss without using a pressure vessel or the like.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a configuration diagram of another embodiment of the present invention.

[Explanation of symbols]

1: normal pressure steam generator, 2: combustion device, 3: cooker,
4: steam passage, 5: fan, 6: combustion gas passage, 7: fan, 8: mixing chamber, 9: steam passage, 10: fan.

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[Procedure amendment]

[Submission date] October 15, 1998 (1998.10.
15)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction contents]

[0010]

FIG. 1 is a configuration diagram of an embodiment of the present invention. In this embodiment, the steam generated by the normal-pressure steam generator 1 is heated to a high temperature by the combustion gas burned by the combustion device 2 to produce normal-pressure superheated steam, and the normal-pressure superheated steam is sent to the cooking device 4. It is used for various heating cooking. The atmospheric pressure steam generator 1 is connected to the cooking device 3 via the steam passage 4.
Connected to. A fan 5 is provided in the steam passage 4 to send steam to the cooking device 4. A combustion gas passage 6 for feeding combustion gas from the combustion device 2 is connected in the middle of the steam passage 4. A fan 7 is provided in the combustion gas passage 6 to feed combustion gas into the steam passage 4. As a result, the high-temperature combustion gas is mixed with the normal-pressure steam in the steam passage 4 to raise the temperature of the steam to obtain normal-pressure superheated steam. What
The superheated steam sent to the cooking device 3 is used for cooking.
After use, it is discharged from the cooking device 3, so that the inside of the cooking device 3 is always
The superheated steam is flowing through the
Key is retained.

Claims (2)

[Claims] 1. A method for producing superheated steam under normal pressure, wherein water is heated at normal pressure to generate steam, and the steam is mixed with a combustion gas to be superheated. 2. The method for producing superheated steam under normal pressure according to claim 1, wherein the combustion gas is obtained by burning a liquid containing C and H, or a gaseous fuel or natural gas.