JP2021177102A - Superheated steam generation device - Google Patents

Abstract

To prevent liquefied water from being discharged from a superheated steam generation device.SOLUTION: A superheated steam generation device 100 generates superheated steam by heating steam introduced from an introduction port P1, discharges the superheated steam from a discharge port P2, and comprises a water discharge prevention mechanism 4 for preventing water liquefied from the steam, from being discharged from the discharge port P2. The water discharge prevention mechanism 4 comprises a temperature sensor 41 provided in a steam housing part 2, and a control device 42 for controlling heating of the steam housing part 2 so that a detected temperature of the temperature sensor 41 is 100°C or higher.SELECTED DRAWING: Figure 1

Description

The present invention relates to a superheated steam generator that heats steam to generate superheated steam.

In recent years, a superheated steam treatment apparatus that cleans, dries, or sterilizes an object to be treated using superheated steam has been considered (for example, Patent Document 1).

This superheated steam generator includes a saturated steam generator that heats water to generate saturated steam and a superheated steam generator that heats the saturated steam to generate superheated steam. Further, some superheated steam generators do not have a saturated steam generating unit and are supplied with externally generated saturated steam to generate superheated steam.

In these superheated steam generators, when steam is supplied in a state where the superheated steam generator is at a temperature of 100 ° C. or lower, for example, at the start of operation, the steam is liquefied in the superheated steam generator at 100 ° C. or lower. Water will be derived from the superheated steam generator.

However, some objects to be heat-treated with superheated steam are adversely affected by the derived water.

Japanese Unexamined Patent Publication No. 2006-226651

Therefore, the present invention has been made to solve the above-mentioned problems, and its main object is to prevent liquefied water from being derived from the superheated steam generator.

That is, the superheated steam generator according to the present invention is a superheated steam generator that heats a steam accommodating portion having an introduction port and a lead-out port, heats the steam introduced from the introduction port, and derives superheated steam from the lead-out port. It is provided with a water discharge prevention mechanism for preventing the water vapor liquefied from being drawn out from the outlet, and the water discharge prevention mechanism includes a temperature sensor for detecting the temperature of the water vapor accommodating portion and the water vapor accommodating portion. The control device has a control device for controlling the heating of the unit, and the control device of the water vapor accommodating unit so that the detection temperature of the temperature sensor becomes 100 ° C. or higher before the water vapor is introduced into the introduction port. It is characterized by controlling heating.

In such a superheated steam generator, the steam is introduced into the introduction port after the temperature of the steam storage portion is heated to 100 ° C. or higher by the water discharge prevention mechanism, so that steam is introduced from the outlet port. It is possible to prevent liquefied water from being derived. As a result, it is possible to suppress the adverse effect of liquefied water on the object to be heat-treated using superheated steam.

In order to prevent liquefied water from being derived from the outlet port, the temperature of the outlet port must be at least 100 ° C. or higher. Therefore, it is desirable that the temperature sensor is provided on the lead-out port side in the water vapor accommodating portion.

It is conceivable that the superheated steam generator of the present invention has a configuration in which an on-off solenoid valve is provided on the introduction port side.
In order to automatically activate the water discharge prevention function in this configuration, the control device opens the on-off solenoid valve when the detection temperature of the temperature sensor reaches 100 ° C. or higher, and introduces the control device. It is desirable to introduce water vapor into the port. Further, even in the case of a device configuration separate from the saturated steam generator, it is possible to control on the introduction port side of the superheated steam generator so that steam is not introduced before the temperature of the superheated steam generator reaches 100 ° C. or higher.

In order to alleviate the heat shock of the superheated steam generator, the on-off solenoid valve is an electric proportional valve, and the control device may be opened so that the valve opening degree of the electric proportional valve is gradually increased. desirable.

Further, it is desirable that the superheated steam generator of the present invention is provided on the lead-out port side and further includes a lead-out side trap mechanism for trapping the water in which the steam is liquefied.
With this configuration, it is possible to further prevent the liquefied water from being derived from the superheated steam generator.

Further, in the present invention, it is desirable that the superheated steam generator is further provided on the introduction port side and further includes an introduction side trap mechanism for trapping the water in which the steam is liquefied.
With this configuration, it is possible to prevent the liquefied water of steam from being introduced into the superheated steam generator, and further prevent the liquefied water from being derived from the superheated steam generator.

According to the present invention configured as described above, since the superheated steam generator has a water discharge prevention mechanism, it is possible to prevent liquefied water from being derived from the superheated steam generator.

It is a figure which shows typically the structure of the superheated steam generator which concerns on one Embodiment of this invention. It is a perspective view which shows typically the specific structure of the superheated steam generator in the same embodiment. It is sectional drawing which shows typically the specific structure of the superheated steam generator in the same embodiment. It is a perspective view which shows typically the specific structure of the conductor tube in the same embodiment. It is a figure which shows the operation from the stopped state of the same embodiment to the introduction of water vapor into an introduction port.

Hereinafter, an embodiment of the superheated steam generator according to the present invention will be described with reference to the drawings.

<1. Device configuration>
The superheated steam generator 100 according to the present embodiment heats steam generated outside to generate superheated steam of more than 100 ° C. (200 ° C. to 2000 ° C.). As the device for generating steam externally (steam generating device), any boiler that can generate steam from water can be used.

As shown in FIG. 1, the superheated steam generator 100 of the present embodiment induces and heats the steam introduced from the introduction port P1 to generate superheated steam, and derives the superheated steam from the out-licensing port P2. ..

Specifically, as shown in FIGS. 2 and 3, the superheated steam generator 100 axially short-circuits the spirally wound cylindrical conductor tube 2 so that the inside and outside of the conductor tube 2 are short-circuited. Alternatively, induction heating is performed by the magnetic flux generation mechanism 3 provided on one of them to heat the water vapor flowing through the conductor tube 2 to generate superheated water vapor.

The conductor tube 2 is a water vapor accommodating portion having an introduction port P1 and a lead-out port P2. The conductor tube 2 is formed into a cylindrical shape by spirally winding a conductive tube and short-circuited in the axial direction, and leads out the introduction port P1 into which steam is introduced and superheated steam. It has a derivation port P2. By connecting the connecting pipe to the conductor pipe 2, the connecting pipe may have the introduction port P1 or the connecting pipe may have the outlet port P2. Further, the winding portions corresponding to one winding of the conductor tube 2 are in contact with or close to each other. As the material of the conductor tube 2, for example, austenitic stainless steel or an inconel alloy can be used. The detailed configuration of the conductor tube 2 will be described later.

The magnetic flux generation mechanism 3 is provided on the inside and outside of the conductor tube 2 to induce and heat the conductor tube 2, and has an induction coil 31 provided along the inner surface and the outer surface of the conductor tube 2. The magnetic flux generation mechanism 3 may have a magnetic path forming member such as an iron core (not shown). An AC voltage is applied to the induction coil 31 by an AC power supply having a commercial frequency (50 Hz or 60 Hz).

In the superheated steam generator 100 configured in this way, by applying an AC voltage of 50 Hz or 60 Hz to the induction coil 31, an induced current flows through the conductor tube 2 and the conductor tube 2 generates Joule heat. Then, the steam flowing through the conductor pipe 2 receives heat from the inner surface of the conductor pipe 2 and is heated to generate superheated steam.

Then, in the superheated steam generator 100 of the present embodiment, as shown in FIGS. 2 and 4, the introduction ports P1 of the conductor pipe 2 are provided at both ends in the axial direction of the conductor pipe 2, and the outlet port of the conductor pipe 2 is provided. P2 is provided at the central portion of the conductor tube 2 in the axial direction. The lead-out port P2 of the present embodiment is provided at a position where the conductor tube 2 is bisected in the axial direction, but the present invention is not limited to this.

Specifically, as shown in FIG. 4, the conductor tube 2 is divided into two conductor tube elements 21 and 22 at the central portion in the axial direction. Introductory ports P1 are provided at the axially outer ends 21a and 22a of the conductor tube elements 21 and 22, and outlet ports P2 are provided at the axial inner ends 21b and 22b of the conductor tube elements 21 and 22. Has been done. By arranging these two conductor tube elements 21 and 22 continuously in the axial direction, the introduction ports P1 of the conductor tube 2 are provided at both ends in the axial direction of the conductor tube 2, and the outlet ports P2 of the conductor tube 2 are provided. It will be provided at the central portion in the axial direction of the conductor tube 2.

The winding portions of the conductor tube elements 21 and 22 adjacent to each other are electrically connected by, for example, welding, and the opposing portions of the two conductor tube elements adjacent to each other are electrically connected to short-circuit the entire conductor tube. The circuit is configured. As a result, the conductor tube 2 becomes a secondary coil for one turn. The conductor tube elements 21 and 22 of the present embodiment have the same number of turns, but are not limited to this.

Here, in the opposing portions of the two conductor tube elements 21 and 22, the portions other than the lead-out port P2 are joined by a first joining element (not shown) having conductivity over the entire circumferential direction. The first joining element may be formed by welding.

In the present embodiment, as shown in FIG. 4, the lead-out port P2 of each conductor tube element 21 and 22 has an axial inner end portion 21b and 22b of each conductor tube element 21 and 22 having a radius of curvature twice the tube diameter. It is formed by bending with. Here, the lead-out port P2 is formed by bending the wound portion of each of the conductor tube elements 21 and 22 radially outward.

The axial inner end 21b of one conductor tube element 21 and the axial inner end 22b of the other conductor tube element 22 are configured to be close to each other in the circumferential direction, and the two conductor tube elements 21 and 22 are derived. The ports P2 are provided in contact with or in close proximity to each other. These two lead-out ports P2 are electrically joined to each other by a second conductive joining element 23. In the present embodiment, they are joined by a second joining element 23 so as to fill the space formed between the two out-licensing ports P2. The second joining element 23 is made of the same material as the conductor tube 2 or has substantially the same physical characteristics.

With respect to the conductor tube 2 configured in this way, the magnetic flux generation mechanism 3 is provided inside and outside the conductor tube 2 as shown in FIGS. 1 and 2. The magnetic flux generation mechanism 3x provided on the outside of the conductor tube 2 (the pull-out side of the lead-out port P2) is divided in the axial direction and is provided on the upper side and the lower side of the lead-out port P2, respectively. Further, the magnetic flux generation mechanism 3y provided inside the conductor tube 2 (the side opposite to the pull-out side of the lead-out port P2) is not divided in the axial direction and has an integral structure.

<2. Flood prevention mechanism ＞
As shown in FIG. 1, the superheated steam generator 100 of the present embodiment includes a water discharge prevention mechanism 4 for preventing water liquefied from water vapor from being derived from the outlet port P2.

The water discharge prevention mechanism 4 is provided on the conductor tube 2 and controls induction heating so that the temperature sensor 41 that detects the temperature of the conductor tube 2 and the detection temperature of the temperature sensor 41 become a set temperature of 100 ° C. or higher. It has a control device 42 to operate.

The temperature sensor 41 is provided on the lead-out port P2 side of the conductor tube 2. When the temperature sensor 41 is provided on the lead-out port P2 side, it is provided in the extending portion (the portion extending from the spiral portion) of the conductor pipe 2 in which the lead-out port P2 is provided, and the conductor adjacent to the lead-out port P2. It may be provided in the spiral portion (rolled portion) of the pipe 2, or may be provided in the connecting pipe connected to the lead-out port P2.

The control device 42 includes a CPU, a memory, an A / D converter, a D / A converter, and the like, and is based on the temperature detected by the temperature sensor 41 before the water vapor is introduced into the introduction port P1. Inductive heating is controlled so that the detection temperature of 41 becomes a set temperature of 100 ° C. or higher. The set temperature of 100 ° C. or higher is set so that the entire conductor tube 2 is surely set to 100 ° C. or higher, for example, 150 ° C.

Here, the water discharge prevention mechanism 4 further has an on-off solenoid valve 43 provided on the introduction port P1 side. When the on-off solenoid valve 43 is provided on the introduction port P1 side, it is provided in the extending portion (the portion extending from the spiral portion) of the conductor tube 2 in which the introduction port P1 is provided, and is connected to the introduction port P1. It may be provided in the connecting pipe.

Then, as shown in FIG. 5, the control device 42 automatically opens and closes the solenoid valve 43 when the detection temperature of the temperature sensor 41 reaches a set temperature of 100 ° C. or higher, for example, after the operation is started from the stopped state. It is opened to introduce water vapor into the introduction port P1. The on-off solenoid valve 43 of the present embodiment is an electric proportional valve, and the control device 42 is opened so that the valve opening degree of the electric proportional valve 43 is gradually increased.

The opening / closing time (time from the closed state to the open state) of the electric proportional valve 43 can be adjusted based on the difference between the temperature of the introduced water vapor and the detection temperature of the temperature sensor 41. For example, if the difference between the water vapor temperature and the detected temperature is small, the effect of heat shock is small, so it is conceivable to shorten the opening / closing time. It is conceivable to do.

In addition, in the present embodiment, as shown in FIG. 1, a lead-out side trap mechanism 5 for trapping water in which water vapor is liquefied is provided on the lead-out port P2 side. The lead-out side trap mechanism 5 has a storage unit 51 for storing liquefied water and a discharge unit 52 for discharging the water accumulated in the storage unit 51. When the lead-out trap mechanism 5 is provided on the lead-out port P2 side, it is provided in the extending portion (the portion extending from the spiral portion) of the conductor tube 2 in which the lead-out port P2 is provided, and is connected to the lead-out port P2. It may be provided in the connecting pipe to be connected. Here, it is desirable that the lead-out side trap 5 is provided at a position as close as possible to the superheated steam lead-out port of the superheated steam generator 100.

Further, an introduction side trap mechanism 6 for trapping water in which water vapor is liquefied is provided on the introduction port P1 side. The introduction-side trap mechanism 6 has a storage unit 61 for storing liquefied water and a discharge unit 62 for discharging the water accumulated in the storage unit 61. When the introduction side trap mechanism 6 is provided on the introduction port P1 side, it is provided in the extending portion (the portion extending from the spiral portion) of the conductor pipe 2 in which the introduction port P1 is provided, and is connected to the introduction port P1. It may be provided in the connecting pipe to be connected. Here, it is desirable that the introduction side trap mechanism 6 is provided at a position as close as possible to the spiral portion in the extending portion of the conductor tube 2.

<3. Effect of this embodiment>
According to the superheated steam generator 100 according to the present embodiment configured in this way, steam is introduced into the introduction port P1 after the temperature on the outlet port P2 side is heated to 100 ° C. or higher by the water discharge prevention mechanism 4. Therefore, it is possible to prevent water vapor liquefied from being derived from the outlet port P2. As a result, it is possible to suppress the adverse effect of liquefied water on the object to be heat-treated using superheated steam.

When the detection temperature of the temperature sensor 41 reaches a set temperature of 100 ° C. or higher, the control device 42 opens the on-off solenoid valve 43 and introduces water vapor into the lead-out port P1, so that the water discharge prevention function is automatically provided. I can get it to work. Further, in the case of a device configuration separate from the saturated steam generator, it is possible to control on the introduction port side of the superheated steam generator so that steam is not introduced before the temperature of the superheated steam generator reaches 100 ° C. or higher.

Since the lead-out side trap mechanism 5 is provided on the lead-out port P2 side, it is possible to further prevent the liquefied water from being led out from the superheated steam generator 100. Further, since the introduction side trap mechanism 6 is provided on the introduction port P1 side, it is possible to prevent the liquefied water of steam from being introduced into the superheated steam generator 100, and the liquefied water is derived from the superheated steam generator 100. It can be further prevented from being done.

<4. Other effects of this embodiment>
The present invention is not limited to the above embodiment.

For example, in the above-described embodiment, the conductor tube is joule-heated by the induction heating method, but the conductor tube may be joule-heated by the direct energization heating method. Further, the conductor tube may be configured to heat the water vapor flowing through the tube by heating the tube with an external heat source (for example, a heater) without generating Joule heat.

Further, although the temperature sensor 41 of the above embodiment is provided on the lead-out port P2 side, it may be at any position as long as the temperature of the conductor tube 2 can be detected.

Further, although the electromagnetic on-off valve of the above embodiment is provided in the superheated steam generator, it may be provided on the lead-out side of the steam generator that supplies steam to the superheated steam generator.

Moreover, the structure of the conductor tube is not limited to the above-described embodiment, and may be a structure in which one conductor tube is spirally wound.

Although the water vapor accommodating portion of the above embodiment is configured by using a conductor pipe, it may be a container for accommodating water vapor.

Further, in addition to the configuration of the above embodiment, the superheated steam generator may have a steam generator that heats water to generate steam.

In addition, the present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit of the present invention.

100 ・ ・ ・ Superheated steam generator P1 ・ ・ ・ Introduction port P2 ・ ・ ・ Derivation port 2 ・ ・ ・ Conductor pipe 4 ・ ・ ・ Water discharge prevention mechanism 41 ・ ・ ・ Temperature sensor 42 ・ ・ ・ Control device 43 ・ ・ ・ Opening and closing Solenoid valve (electric proportional valve)
5 ・ ・ ・ Derivation side trap mechanism 6 ・ ・ ・ Introduction side trap mechanism

Claims (6)

A superheated steam generator that heats a steam accommodating portion having an introduction port and an outlet port, heats steam introduced from the introduction port, and derives superheated steam from the outlet port.
A water discharge prevention mechanism for preventing the liquefied water of the water vapor from being drawn out from the outlet is provided.
The water discharge prevention mechanism includes a temperature sensor that detects the temperature of the water vapor accommodating portion and a control device that controls heating of the water vapor accommodating portion.
The control device is a superheated steam generator that controls heating of the steam accommodating portion so that the detection temperature of the temperature sensor becomes 100 ° C. or higher before the steam is introduced into the introduction port. The superheated steam generator according to claim 1, wherein the temperature sensor is provided on the lead-out port side in the steam accommodating portion. An on-off solenoid valve is provided on the introduction port side.
The superheated steam generator according to claim 1 or 2, wherein the control device opens the on-off solenoid valve when the detection temperature of the temperature sensor becomes 100 ° C. or higher. The on-off solenoid valve is an electric proportional valve.
The superheated steam generating device according to claim 3, wherein the control device is opened so that the valve opening degree of the electric proportional valve is gradually increased. The superheated steam generator according to any one of claims 1 to 4, further comprising a lead-out side trap mechanism that is provided on the lead-out port side and traps water in which the steam is liquefied. The superheated steam generator according to any one of claims 1 to 5, further comprising an introduction-side trap mechanism for trapping water in which the steam is liquefied, which is provided on the introduction port side.

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