JP2003004204A - High temperature steam generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high temperature steam generating device capable of effecting mass production of high temperature steam at a low cost. SOLUTION: The high temperature steam generating device is formed of a conductive metal having heat resistance and consists of a heat transfer pipe 1, provided with a steam feed end 4 and a steam discharge end 5; and a heating device 16 to effect heating of the heat transfer pipe 1 through energization of the heat transfer pipe 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a high temperature steam generator.

[0002]

2. Description of the Related Art Conventionally, as a high temperature steam generator which has been widely spread, as shown in FIG. 5, a heater 25 and a heat transfer tube 21 are provided in an outer casing 22 partitioned in a box shape.
In general, the outer casing 2 has a structure in which a heat storage material 26 such as ceramic wool is filled, and the steam generator includes a steam transfer end 2 of the heat transfer tube 21.
By passing water at 3, the heater 2 and the heat storage material 26
The water that passes through the heat transfer tube 21 is heated by and, and finally high temperature steam is continuously discharged from the exhaust port 24 of the heat transfer tube 21.

[0003]

For example, when incinerating industrial waste, there is a problem that dioxin, which is harmful to the human body, is generated. From this fact, an atmosphere of high temperature steam of 800 ° C. or higher, which exceeds the dioxin formation temperature, is formed. However, the method of incineration of industrial waste in that atmosphere and incineration while preventing the generation of dioxin harmful to the human body is adopted.
In recent years, it has attracted attention as an epoch-making industrial waste incineration method.

However, at the present stage, while satisfying the conditions of low cost and mass production, the temperature of 800 ° C.
There is no specific method that can generate high-temperature steam as above, and in the incineration process of the industrial waste, it is obliged to select an incineration method that burns oil or gas as in the past. Not only the application to incineration, but the advent of a high-temperature steam generator that can meet the conditions of low cost and mass production is desired.

It is an object of the present invention to provide a high temperature steam generator capable of producing high temperature steam at low cost and for mass production.

[0006]

According to a first aspect of the present invention, there is provided a heat transfer tube which is formed of a heat-resistant conductive metal and has a steam supply end and an exhaust end, respectively, and the heat transfer tube. A heating device that heats the heat transfer tube by energizing the
It is characterized in that it is configured from.

Although the metal applied to the heat transfer tube is not particularly limited, it is specifically formed of a stainless alloy which has a low manufacturing cost, a high thermal conductivity, and is easily processed. Further, the shape of the heat transfer tube may be one that can generate a large amount of high-temperature steam in a space-saving manner,
Specific examples include a coiled form. Further, the heating device may be any device capable of energizing the heat transfer tube so that the steam passing through the heat transfer tube is heated to a steam having a desired temperature. A power supply device of a phase welding machine and the like can be mentioned. Further, the means for sending the steam into the heat transfer tube of the present steam generator is not particularly limited, but it is also possible to send the steam generated in a generally widely used heat storage tank or the like into the heat transfer tube.

When formed in this manner, the heat transfer tube is energized in the heating device to be heated by the electric resistance of the heat transfer tube as a load, whereby the steam passing through the heat transfer tube is heated to high temperature steam. Finally, it becomes possible to discharge high-temperature steam of 800 ° C. or higher at the exhaust end.

Further, a sufficiently high temperature steam can be obtained by heating the heat transfer tube by energizing it. However, if the heat transfer tube is housed in a heat insulation tank as described in claim 2, it will be affected by outside air. When the heat transfer tube is not cooled and the heat storage material is housed in the heat retaining tank as in claim 3, heating by the heat transfer tube is performed more efficiently. Here, the heat insulation tank is a concept including all that can block heat outflow between the outside and the heat transfer tube. Also, the heat storage material is not particularly limited as long as it has a heating effect and a heat retaining effect on the heat transfer tube.

If the heating device is provided with a temperature control means, the heating device is energized from the heating device to the heat transfer tube in response to a change in the generated steam temperature. By switching the ON / OFF, the high temperature steam discharged at the exhaust end of the heat transfer tube does not exceed the set temperature or does not fall below the set temperature, and the high temperature steam is always in a constant temperature state. Since it is maintained, it does not waste the energy required to generate steam,
It becomes possible to stably feed high temperature steam.

Here, the temperature control means means all means for controlling the start / stop of the heating device to keep the high temperature steam discharged in the heat transfer tube at a constant temperature state. An example of the SSR (solid state relay) is to open / close the power supply path connected to the heat transfer tube to control the start / stop of the heating device.

Further, the invention according to claim 5 ensures the insulation between the exhaust end side or the steam supply end side protruding to the outside of the heat-retaining tank in the heat transfer pipe, or the pipe line connected to the heat transfer pipe on both end sides. If an insulating member is provided, even if an operator suddenly touches a heat transfer tube that is energized, a dangerous electric shock may occur.
Can prevent short circuit accidents. Here, the insulating member may be any member that can cut off the power supply to the heat transfer tube at the installation site, and specifically, a ceramic or the like having high insulation and heat resistance is applied.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the high temperature steam generator of the present invention will be described in detail below. In this embodiment,
This high-temperature steam generator is applied to an incinerator for industrial waste and is configured to receive steam generated by a heat storage tank as shown in FIG. 5, which is generally widespread. Specifically, steam of about 400 ° C. is sent toward the high temperature steam generator of the present invention.

First, a general description of the high temperature steam generator of the present embodiment will be given with reference to FIG. 1. The heat retaining tank 2 is formed by a box-shaped outer casing made of microtherm (hereinafter, referred to as an external The casing 2 will be referred to as a casing 2.), and the heat transfer tube 1 having a coil shape is housed in the outer casing 2.
Further, the outer casing 2 is filled with powdered ceramic wool 18. Moreover, power source terminals 7 and 7 are provided near the steam inlet 4 side and the steam outlet 5 side of the heat transfer tube 1, respectively, and the control B0X17
Among them, the power supply device 16 of the single-phase welding machine, which serves as the heating device 16 for the heat transfer tube 1, and the temperature control means 1 of the power supply device 16.
It houses the circuit that incorporates the SSR12 that becomes 2,
In this SSR 12, the steam temperature on the side of the heat transfer tube 1 and the incinerator detection area C is the detection area A, B, C in each of the temperature sensors 13, 14, 15 installed in each detection area A, B, C. When the temperature inside C exceeds the set temperature, the SS
When R12 is turned off and the relay is stopped to stop energizing the heat transfer tube 1 from the power supply device 16, while the temperature of the steam discharged from the heat transfer tube 1 becomes lower than the set temperature, S is again set.
The SR 12 starts the relay, the power supply device 16 is energized, and the temperature of the steam is maintained.

The heat transfer tube 1 is formed by bending a long pipe material made of stainless alloy into a coil shape. One end side of the heat transfer tube 1 serves as a steam inlet 4, while the other side The end side is an outlet 5 for the steam generated in the heat transfer tube 1. Further, the outer casing 2 of the heat transfer tube 1
Plate-shaped power supply terminals 7 and 7 respectively hang downward from the portions projecting from the outside to the power supply device 16 described above. Further, the heat transfer tube 1
An insulating flange 11 made of ceramic is fitted between the steam discharge port 5 and a pipe line 19 leading to an incinerator connected to the steam discharge port 5 in the vicinity of the steam discharge port 5, and thereby the heat transfer tube 1 Even when electricity is being supplied to the heat transfer tube 1, the insulation effect is exerted in the portion of the conduit 19 on the incinerator side of the location where the insulating flange 11 of the heat transfer tube 1 is installed, and an electric shock / short circuit accident can be prevented for the operator. ing.

SSR which is the main part of the temperature control means
As shown in FIGS. 3 and 4, the (solid-state relay) 12 includes a heat transfer tube detection area A, a heat transfer tube exhaust port detection area B, and an incinerator detection area C by the temperature sensors 13, 14, and 15, respectively. The steam temperature in the areas A, B, and C is detected, and the on / off of the power supply from the power supply device 16 to the heat transfer tube 1 is controlled. Then, the SSR 12 has a steam temperature of 8 depending on the temperatures detected by the temperature sensors 13, 14 and 15, respectively.
By controlling ON / OFF of energization on the basis of 00 ° C., the heating state of the heat transfer tube 1 is accurately controlled to a constant temperature. The SSR 12 may be of various types depending on the set amperage of the power supply device 16 when energized. Therefore, the SSR 12 is compatible with the current of 320 amperes included in the power supply device 16 used in the present embodiment. It is desirable to use the above kind.

In the steam generator of this embodiment, the steam generated at the steam inlet 4 of the heat transfer tube 1 is heated by the power supply 16 to heat the heat transfer tube 1 When the high temperature steam becomes 800 ° C. or higher and the high temperature steam discharged at the steam discharge port 5 of the heat transfer tube 1 is heated to 800 ° C. or higher in consideration of the waste of energy, the power supply device 16 is controlled by the SSR 12. By turning off the energization and stopping the heating of the heat transfer tube 1, the start switch of the power supply device 16 is turned on / off.
The temperature of the high temperature steam that is controlled and sent into the incinerator for industrial waste is always sent at a constant temperature.

[0018]

According to the invention described in claim 1 of the present invention, the heat transfer tube is energized, and the steam taken into the tube heated by the electric resistance of the heat transfer tube due to the energization passes to obtain the value. It is possible to provide a high-temperature steam generator that can obtain high-temperature steam at a desired temperature instantly and can be mass-produced at low cost.

According to the second and third aspects of the present invention, the heat transfer tube can be heated more efficiently.

According to the fourth aspect of the present invention, since the temperature control means is provided in the heating device, the generated high-temperature steam is stabilized at a constant temperature while being maintained at a constant temperature. Can be supplied.

In the invention according to claim 5 of the present invention, since the electrically conductive portion of the heat transfer tube can be blocked by the insulating member to prevent an electric shock / short circuit accident, the safety of the worker can be more surely ensured.

[Brief description of drawings]

FIG. 1 is a front view showing a high temperature steam generator of the present invention.

FIG. 2 is a cross-sectional plan view of the high temperature steam generator of the present invention.

FIG. 3 is an explanatory diagram showing a main part of a high temperature steam generator of the present invention.

FIG. 4 is a circuit diagram of a heating device and temperature control means of the present invention.

FIG. 5 is a vertical sectional front view showing a conventional high temperature steam generator.

[Explanation of symbols]

1 heat transfer tube 2 External casing (heat insulation tank) 4 Steam intake (steam end) 5 Steam outlet (exhaust end) 11 Insulation flange (insulation member) 12 SSR (temperature control means) 16 Power supply device (heating device) 18 Ceramic wool (heat storage material) 19 pipelines

Claims (5)

[Claims] 1. A heat transfer tube (1) which is made of a heat-resistant conductive metal and has a steam supply end (4) and an exhaust end (5), and the heat transfer tube (1) is energized. A high temperature steam generator comprising a heating device (16) for heating the heat transfer tube (1). 2. The high-temperature steam generator according to claim 1, wherein the heat transfer tube (1) is housed in a heat insulation tank (2). 3. A heat storage material (1) is provided in the heat insulation tank (2).
The high temperature steam generator according to claim 2, characterized in that (8) is housed therein. 4. The high-temperature steam generator according to claim 1, wherein the heating device (16) is provided with a temperature control means (12). 5. A heat retaining tank (2) in the heat transfer tube (1)
Of the exhaust end (5) side or the steam supply end (4) side protruding outside the
Alternatively, at both end sides (4,5), an insulating member (1) for ensuring insulation with the conduit (19) connected to the heat transfer tube (1).
1) provided with 1),
The high-temperature steam generator according to 3, 4.