JPH04198603A - Superheated steam generating device - Google Patents

Abstract

PURPOSE:To discharge the superheated steam without lowering its temperature by providing a water supplying section at the ceiling section of the casing and installing a heat accumulating plate at its bottom section, and fixing a heating cylinder opening its lower end at the ceiling section of the casing. CONSTITUTION:A water supplying section 4 is provided at the ceiling section 3 of the casing 2, and at its bottom section 5 a heat accumulating plate 6 is provided. A heating cylinder 11 the lower end of which is open is fixed at the ceiling section of the casing, and a heater 12 is arranged inside the heating cylinder 11. A steam discharge section 14 enters the inside of the upper section of the heating cylinder 11. When water is supplied in water drops from the water supplying section 4, the water makes natural fall and makes contact with the heat accumulating plate 6 at the bottom section 5 and the water is instantaneously vaporized to become steam, which fill the inside of the casing. And, the steam is discharged from the steam discharge section 14 and reheated by the heater 12 inside the heating cylinder 11, and then the steam is discharged from the steam discharge section 14. With this arrangement it is possible to discharge the steam as it is in the superheated state without lowering its temperature, and, therefore, high temperature steam is obtained.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a device that generates superheated steam by reheating steam generated in a pressure-resistant casing with a heater, and is capable of reheating steam generated within a pressure-resistant casing to generate superheated steam. sterilization, sauna equipment,
It is used in fields such as food thermal processing and sterilization, steam heating, and bamboo processing.

(Prior art and its problems) As this type of superheated steam generator,
There is something disclosed in 9QO1 issue.

In this device, a porous material is interposed between two electrodes installed in a casing, and Joule heat is obtained by supplying water to this material, steam is ejected from the holes, and a heater connected in series is used to generate steam. The structure is such that superheated steam is obtained by heating the

However, since this device uses steam generation or Joule heat, it is difficult to control the amount of steam generated.
In addition, because the steam generating section is located at the upper part of the casing and the heater is located below it, thermal efficiency is poor even with superheated steam, and only steam at a relatively low temperature of about 105 degrees Celsius can be obtained. There is also the disadvantage that the range in which steam can be used is narrowed.

(Technical Section 1i) The present invention lowers the temperature of superheated steam in a device (1) that generates superheated steam by reheating steam generated in a pressure resistant casing (2) with a heater (12). The challenge was to discharge the water without causing any damage.

(Technical means) The technical means for solving this technical problem are: (a) water supply section (4) provided on the ceiling (3) of the casing (2), (b) its bottom (5) Heat storage plates (6), (c) placed in
A heating tube (11) fixed to the ceiling (3) of the casing and having an open bottom end; (d) A heater (12) placed inside the heating tube (11).
, j (e) A heating cylinder (11) 17) A steam v1 outlet (14) facing the inner side of the upper part.

In this case, a heater can be incorporated into the heat storage plate, or a heater can be placed in place of the heat storage plate.

(Effect of technical means) Since the heater (12) is placed in the heating cylinder (11) which is suspended from the ceiling (3) of the casing (2) with a downward opening, when the heater (12) is heated, , radiates heat from the outer surface of the cylinder into the casing (2) space, and also radiates heat from the lower opening of the heating cylinder (11) to the heat storage plate (6) to heat it, and the heat storage plate (6) radiates the heat. Heat is stored.

Water supply section (4) provided on the ceiling (3) of the casing (2)
) When water is supplied in the form of water droplets, the water naturally falls and comes into contact with the heat storage plate (6) on the bottom (5), where it instantaneously vaporizes and becomes steam, filling the casing (2).

Steam is discharged from the steam exhaust part (14) installed inside the upper part of the heating cylinder (11), but the steam is discharged from the casing (2).
) has a heating cylinder (11) opened at its lower end on the ceiling (3).
) is suspended, the generated steam is forced to pass through the heating cylinder (11).

The steam entering the heating cylinder (11) is reheated and raised in temperature by the heater (12) inside the heating cylinder (11),
The superheated steam rises and is discharged from the steam exhaust part (14) facing inside the upper part of the heating cylinder (11).

This heat storage plate (6) can ensure a - much higher temperature if a heater is incorporated therein or if a heating plate is placed in place of the heat storage plate.

As described above, the steam is discharged in a superheated state.

(Effects of the present invention) As a result of being able to discharge steam in a superheated state without lowering its temperature, steam at a high temperature of 130 to 180°C can be obtained, which can be used continuously, and the amount of steam can be reduced. It also has the advantage of being easy to control.

(Example) Next, a specific example of the above technical means will be explained with reference to the drawings.

The drawing is a schematic cross-sectional view of the above-mentioned superheat generator (1).

The internal pressure of the pressure-resistant casing (2) is approximately equal to the discharge pressure of superheated steam, and is preferably maintained at about 1.2 to 2.01 Lt&. Therefore, it is desirable to use a strong metal such as titanium alloy for this casing.

The internal pressure of the casing (2) can be adjusted not only by the amount of water supplied, which will be described later, but also by the operating conditions of the safety valve (8).

The outside of the pressure resistant casing (2) is covered with an exterior casing (lO) made of a heat insulating material, and the casing (2)
Prevents heat loss inside. As this heat insulating material, a known heat insulating material such as glass wool or foamed polyurethane is used.

The heat storage plate (6) installed at the bottom (5) of the casing is made of a metal with high thermal conductivity such as copper.

The water dripping from the water supply pipe (4) is transferred to this heat storage plate (6).
It turns into steam the moment it comes in contact with the Although a single tube is used in this embodiment, if a plurality of thin tubes are bundled together, water droplets can be dispersed into small pieces and dropped. Alternatively, multiple tubes can be distributed along the inner wall of the casing to distribute heat consumption.

In this embodiment, the heat storage plate (6) is configured in a fixed manner, but if it is configured to be rotatable in a horizontal state,
Since the falling point of the water droplets can be moved relatively, there is an advantage that a partial temperature drop of the heat storage plate can be prevented.

The heating tube (11) suspended from the ceiling (3) of the casing (2) is also made of a metal with high thermal conductivity such as copper. By placing an electric heater (12) along the inner wall, the steam is reheated by both.

The length and electric capacity of the heater (12) may be adjusted depending on the superheating temperature and the required amount of generated steam. By configuring the heating tube (11) vertically, the superheating temperature can be further increased.

In addition, the code|symbol (13) is an electric wire for supplying electricity to a heater (12), and (1B) is a support material of a heater (12).

A discharge pipe (14) for superheated steam reheated by the heater (12) opens into the ceiling (3) of the casing at the center of the heating cylinder (11). This tube is made of a material with relatively low thermal conductivity, such as stainless steel, and its periphery is covered with the same heat insulating material as described above.

Incidentally, reference numeral (9) is a drain for discharging dew condensation water generated when the device 1 (1) is stopped.

[Brief explanation of the drawing]

The drawing is for explaining a specific example of the above technical means, and is a schematic sectional view of a superheated steam generator. (2) Casing, (4) Water supply pipe, (6) Heat storage plate, (
8) Safety valve, (lO) exterior casing, (11) superheater, (12) heater, (14) steam exhaust pipe

Claims (3)

[Claims] (1) In a device that generates superheated steam by reheating steam generated in a pressure-resistant casing with a heater, a water supply section installed on the ceiling of the casing, a heat storage plate placed on the bottom, and a A superheated steam generator consisting of a fixed heating cylinder with its lower end open, a heater placed inside the heating cylinder, and a steam exhaust section facing inside the upper part of the heating cylinder. (2) The superheated steam generator according to claim 1, wherein the heat storage plate has a built-in heater. (3) The superheated steam generator according to claim 1, wherein a heater is arranged in place of the heat storage plate at the bottom of the casing.