JP2019070493A - Superheated steam generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superheated steam generator capable of simplifying an apparatus configuration and reducing a product cost. SOLUTION: The superheated steam generator 20 of the present embodiment has an input pipe 23 for introducing saturated steam on one end 21a side of a housing 21 and an output pipe 24 on the other end 21b side for discharging superheated steam. The housing 21, the main body 31 of the cartridge heater 30 housed in the housing 21 and extending from the one end 21a side to the other end 21b side of the housing 21, and the outer peripheral wall 31a of the main body 31 around the main body 31 in the housing 21. A plurality of thin tubes 40, which are arranged in contact with the input pipe 23 and in which saturated steam introduced into the housing 21 from the input pipe 23 enters from the one end 40a side and heated superheated steam exits from the other end 40b side. As a result, the heat generated by the main body 31 is directly transferred to the plurality of thin tubes 40 around the main body 31, so that it is possible to heat the saturated steam flowing through the plurality of thin tubes 40 with a simple configuration. [Selection diagram] FIG. 4

Description

  The present invention relates to a superheated steam generator for heating saturated steam to generate superheated steam. In the present specification, "superheated steam" is steam obtained by further heating steam (saturated steam) evaporated at a boiling point determined under a certain pressure under the same pressure. In the case of water at atmospheric pressure, it is water vapor heated to a boiling point above 100 ° C.

  As a superheated steam generator which heats saturated steam and generates superheated steam, for example, there is a "normal pressure superheated steam generator" disclosed in Patent Document 1 below. In this superheated steam generator, a bundle of a plurality of heating pipes bundled to be in contact with each other is further covered with a cylindrical outer wall portion, and a heater is wound around the outer wall portion. As a result, the heat generated from the heater upon conduction is transmitted to the plurality of heating tubes via the outer wall portion, thereby enabling the heating of the water vapor passing through each heating tube.

  Further, in the “inductive heating type fluid heating device” disclosed in Patent Document 2 below, a plurality of stainless steel thin tubes are bundled and the periphery is covered with a cylindrical heating tube, and a heat insulating material is provided on the outer periphery of the heating tube. The intervening heating coil is wound. As a result, when high frequency power is supplied to the heating coil, an induction current flows in the heating tube and the heating tube generates heat, and the heat is transmitted to the plurality of thin tubes to flow the fluid such as water vapor in each thin tube. It enables heating.

JP, 2017-101910, A Japanese Patent Application Publication No. 2006-40714

  However, according to the prior art disclosed in the above Patent Documents 1 and 2, a plurality of heating pipes and thin tubes through which water vapor and the like pass are bundled, and the outer circumference is covered with a cylindrical outer pipe and a heater and a coil are wound around the circumference. Adopt a configuration. Therefore, there is a problem that the device configuration may be complicated. Further, stainless steel is used for a heating pipe or a thin tube through which water vapor and the like pass. Therefore, in addition to causing an increase in product cost, there is a problem that it is difficult to improve the heating efficiency of water vapor and the like because the thermal conductivity is smaller than aluminum, copper and brass (brass).

  The present invention has been made to solve the problems described above, and it is an object of the present invention to provide a superheated steam generator capable of simplifying the apparatus configuration and reducing the product cost.

  In order to achieve the above object, the superheated steam generator of the present invention described in claim 1 of the claim is a superheated steam generator for heating saturated steam to generate superheated steam, wherein the saturated steam is And a cylindrical body having an introduction portion for introducing one at one end and a discharge portion for discharging the superheated steam at the other end, and being accommodated in the cylindrical body and extending from the one end to the other end of the cylindrical body A rod-shaped heating element, the saturated steam being disposed around the heating element in the cylinder, in contact with the outer peripheral wall of the heating element, or in the vicinity of the outer peripheral wall, and introduced into the cylinder from the introduction part The present invention is technically characterized by including: a plurality of heating tubes in which the superheated steam which enters from one end side and is heated and exits from the other end side.

  The heating element is in the shape of a rod extending from one end to the other end of the cylinder, and a plurality of heating pipes are in contact with the outer peripheral wall of the heating element around the heating element (or a plurality of heating pipes is the outer circumference of the heating element) Placed near the wall). Thus, the heat generated by the heat generation of the heating element is transmitted directly (or indirectly) to the plurality of heating tubes disposed around the heating element. In addition, since the heating tube is disposed so as to surround the periphery of the heating element, compared to the configuration in which the heating element is disposed around the plurality of bundled heating tubes (configurations of Patent Documents 1 and 2 above), The heat transmitted to the outside of the heating element is effectively utilized (in the configurations of Patent Documents 1 and 2, the heating pipe is not disposed on the outer periphery (periphery) of the heating element). Is wasted). Therefore, since the heating efficiency is improved, it is possible to heat saturated steam flowing in the plurality of heating pipes while having a simple configuration. Moreover, since it is not necessary to wind a heater or a coil around a bundle of a plurality of heating tubes, it is not necessary to accommodate a cylindrical tube or the like that covers the bundle of heating tubes in a cylinder.

  In the superheated steam generator according to claim 2 of the present invention described in claim 2, in the superheated steam generator according to claim 1, a bundle of the plurality of heating pipes in the cylindrical body A technical feature of the present invention is that a plurality of second heating pipes are disposed around the periphery of which the saturated steam enters from one end and the superheated steam exits from the other end.

  Thereby, the heat generated by the heat generation of the heating element is also transmitted to the plurality of second heating pipes disposed around the bundle of the plurality of heating pipes, so that the heat flows in these second heating pipes Saturated steam can also be heated.

  Furthermore, the superheated steam generator of the present invention described in claim 3 described in claim 5 is the superheated steam generator according to claim 1 or claim 2, wherein the plurality of heating tubes are made of brass It is technically characterized that it is made.

  In general, brass (brass) is lower in cost and higher in thermal conductivity than stainless steel. Since brass (brass) is an alloy of copper and zinc, the thermal conductivity (unit: W / (m · K); W (watt), m (meter), K (kelvin) depends on the distribution. ) Is, for example, 16.7 to 20.9 for stainless steel, while 106 for brass. Therefore, compared with the case where the plurality of heating tubes are made of stainless steel, it is possible to reduce the cost of parts of the heating tube, and heat generated from the heating element can be reduced to the plurality of heating tubes and the plurality of second heatings. It becomes possible to transmit to the tube efficiently.

  The introduction portion may be provided on the peripheral wall of the cylindrical body. Thus, for example, when the heat generating body is positioned substantially on the axis of the cylinder, the introduction portion is provided at a position radially away from the heat generating body. For example, the heat generating body is attached to the cylinder When removing a heat generating body from a cylinder, it is hard to be mutually obstructed (especially an introductory part). Therefore, the working efficiency in the manufacturing process and maintenance of the said superheated steam generator can be improved.

  Further, in the case where the introduction portion is provided on the peripheral wall of the cylindrical body, one end side of the plurality of heating pipes may be located closer to the discharge portion than the introduction portion of the cylindrical body. As a result, the saturated steam flowing from the introduction portion can be more easily introduced to the one end side of the heating tube than when the one end side of the plurality of heating tubes is located on the opposite side of the discharge portion with respect to the introduction portion of the cylinder. . Therefore, it is possible to reduce saturated steam passing outside the heating pipe without flowing in the heating pipe. Therefore, the heating efficiency of saturated steam can be further improved.

  According to the first aspect of the present invention, since the heating efficiency is improved, it is possible to heat the saturated steam flowing in the plurality of heating pipes while having a simple configuration. Therefore, the device configuration can be simplified. In addition, since it is not necessary to wind a heater or a coil around a bundle of a plurality of heating tubes, there is no need to accommodate a cylindrical tube or the like covering the bundle of heating tubes in a cylinder, reducing the number of parts. Will also be possible. Therefore, the product cost can be reduced.

  According to the second aspect of the present invention, the heat generated by the heat generation of the heating element is also transmitted to the plurality of second heating tubes disposed around the bundle of the plurality of heating tubes. It also becomes possible to heat the saturated steam flowing in the pipe. Therefore, the flow rate of saturated steam that can be heated can be increased.

  According to the invention of claim 3, compared with the case where the plurality of heating pipes are made of stainless steel, it is possible to reduce the cost of parts of the heating pipe, and the heat generated from the heating element can be reduced to the plurality of heating pipes Can be efficiently transmitted to the second heating tube. Therefore, the apparatus configuration can be simplified, the product cost can be reduced, and the heating efficiency of saturated steam can also be improved.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the structural example of the superheated steam generation system provided with the superheated steam generator which concerns on one Embodiment of this invention. It is a side view which shows the example of the external appearance structure of the superheated steam generator of this embodiment. 3 (A) is a front view seen from the direction of arrows III-A shown in FIG. 2, FIG. 3 (B) is a back view seen from the direction of arrows III-B shown in FIG. It is sectional drawing of the radial direction (direction orthogonal to the longitudinal axis) which looked at the state cut | disconnected by the III-C-III-C line shown to these from the arrow direction. It is the axial direction (longitudinal direction) sectional view which looked at the state which cut a part of output pipe and a housing by the IV-IV line shown in Drawing 3 (A) from the arrow direction. It is explanatory drawing which shows the example of the distribution path of the steam which flows through the inside of a superheated steam generator. It is explanatory drawing which shows the other structural example of a superheated steam generator.

  Hereinafter, an embodiment of a superheated steam generator of the present invention will be described with reference to the drawings. First, a configuration example of a superheated steam generation system 10 provided with a superheated steam generation device 20 according to an embodiment of the present invention will be described based on FIG. 1. A schematic diagram showing an example of the configuration of the superheated steam generation system 10 is shown in FIG.

  As shown in FIG. 1, the superheated steam generation system 10 mainly includes a housing 11, a boiler apparatus 12, a supply pipe 13, a relay pipe 14, a discharge pipe 15, a control apparatus 17, wires 18 and 19, and a superheated steam generation apparatus It is composed of 20 mag. For example, the casing 11 excludes the boiler apparatus 12, the supply pipe 13, the relay pipe 14, the discharge pipe 15, the control apparatus 17, and the wires 18 and 19 except the introduction side end of the supply pipe 13 and the discharge side end of the discharge pipe 15. And the superheated steam generator 20 etc. are accommodated.

  The boiler device 12 is a saturated steam generation device that heats the water supplied via the supply pipe 13 to generate saturated steam. Water is supplied from the water source (not shown) into the inlet end of the supply pipe 13. In the boiler apparatus 12, for example, a reservoir for storing water supplied from the supply pipe 13 at a predetermined water level or more, the water stored in the reservoir is introduced to the inside, and the relay pipe 14 is connected to a space above the water surface. And a heater provided at the bottom so as to be immersed in the water in the boiler and capable of generating heat by power supplied from the outside. The electric heater is electrically connected to the control device 17 through the wiring 18, receives the supply of the driving power controlled by the control device 17, and heats the water to 100 ° C. or higher (approximately atmospheric pressure). . The reservoir, the boiler, and the electric heater that constitute the boiler device 12 are not shown.

  The superheated steam generator 20 is a booster (auxiliary heating device) that heats the saturated steam introduced from the boiler device 12 via the relay pipe 14 to generate superheated steam and discharges the superheated steam from the discharge pipe 15. That is, in the boiler device 12, when the drive power is supplied to the electric heater, the water in the boiler boils to generate saturated steam, and the saturated steam is discharged to the relay pipe 14. The superheated steam generator 20 generates the superheated steam, for example, by heating the saturated steam flowing from the relay pipe 14 at 250 ° C. or higher. The configuration of the superheated steam generator 20 will be described in detail later with reference to FIGS. Therefore, we will only focus on the functional outline here. The superheated steam generator 20 is provided with a cartridge heater 30 (see FIG. 4) as its heat source. The cartridge heater 30 is electrically connected to the control device 17 via the wiring 19, and the supply of drive power is controlled by the control device 17.

  The control device 17 is, for example, a microcomputer. Typically, it comprises a microprocessor, a memory, an input / output interface, a power supply unit, etc., and the microprocessor executes a predetermined control program stored in the memory, whereby the electric heater or the overheating of the boiler apparatus 12 is overheated. The cartridge heater 30 of the water vapor generator 20 is controlled. For example, the water in the boiler and the cartridge heater 30 are controlled in advance based on temperature information output from a not-shown temperature sensor or the like provided in the boiler of the boiler apparatus 12 or the superheated steam generator 20, for example. It is carried out so that it may become the set predetermined temperature.

  Next, the configuration and the like of the superheated steam generator 20 will be described based on FIGS. 2 to 5. The side view which shows the example of the external appearance structure of the superheated steam generator 20 is shown in figure by FIG. Further, FIG. 3 shows a front view, a rear view and a radial cross-sectional view of the superheated steam generator 20, respectively. Furthermore, FIG. 4 shows an axial sectional view of the superheated steam generator 20. Further, FIG. 5 is an explanatory view showing an example of a flow path of the steam flowing in the superheated steam generator 20. As shown in FIG.

  The superheated steam generator 20 mainly includes a housing 21, an input pipe 23, an output pipe 24, a plate 25, a packing 26, a cartridge heater 30, a thin tube 40, and the like. Mounted in place. It should be noted that, in FIG. 1, the superheated steam generator 20 is represented by a simple rectangular symbol for the sake of drawing expression.

  The housing 21 is, for example, a cylindrical tube made of stainless steel (hereinafter referred to as “stainless steel”), and has an axial length (longitudinal length) of about 20 cm and an axial diameter (in a direction orthogonal to the longitudinal axis). ) Is set to about 2 cm. At one end 21a of the housing 21, a stainless steel flange 22a having a flat plate annular shape (wedge shape) is welded. The flange portion 22a has, for example, a diameter of about 5 cm, and a through hole through which the cartridge heater 30 can be inserted is formed at the radial center portion, and a bolt 27 is screwed so as to surround the through hole. There are four compatible female screw holes.

  The other end 21 b of the housing 21 is formed with a bottom 22 b having a discharge hole which can communicate with the output pipe 24. Further, in the peripheral wall 21 c of the housing 21, an introduction hole capable of communicating with the input pipe 23 is formed on the side of the one end portion 21 a.

  The input pipe 23 is a cylindrical pipe made of stainless steel, and is formed, for example, so that the shape in the axial direction of the pipe is L-shaped. At one end of the input pipe 23, an introduction port 23a which can be communicated and connected to the relay pipe 14 is formed, and the other end of the input pipe 23 is in communication with the introduction hole of the peripheral wall 21c of the housing 21 It is welded to 21c.

  In the present embodiment, the input pipe 23 is provided on the peripheral wall 21 c of the housing 21, whereby the main body 31 of the cartridge heater 30 is positioned substantially on the axis of the housing 21 as described later. The input pipe 23 is provided at a position away from the Therefore, for example, when the cartridge heater 30 (main body 31) is attached to the housing 21 or when the cartridge heater 30 (main body 31) is removed from the housing 21, the input pipe 23 or the like does not easily get in the way. Therefore, the working efficiency in the manufacturing process and maintenance of the superheated steam generator 20 can be improved.

  Similarly to the input pipe 23, the output pipe 24 is also a cylindrical pipe made of stainless steel, and is formed, for example, in a linear shape of a predetermined length. An outlet 24a is formed at one end of the output pipe 24 so as to connect and connect the outlet pipe 15, and the other end of the output pipe 24 can communicate with the outlet hole of the bottom 22b of the housing 21. Welded to 22b.

  The plate 25 is, like the flange portion 22a, a flat stainless steel plate having an annular shape (wedge shape). The outer shape of the plate 25 is formed in substantially the same shape as the flange portion 22a, but a female screw hole capable of being screwed into the tapered screw 33 of the cartridge heater 30 is formed at the radial center, and this female screw hole And the through-holes through which the bolts 27 can be inserted are formed at four places.

  The packing 26 is a disk-like sealing member excellent in heat resistance. In the present embodiment, when the plate 25 is attached to the flange portion 22 a of the housing 21 by the four bolts 27, the packing 26 is interposed between the flange portion 22 a and the plate 25. Thereby, the packing 26 closely contacts the flange portion 22a and the plate 25 so as to fill the gap formed between them, and the airtightness between the flange portion 22a and the plate 25 is enhanced. The packing 26 is formed with a through hole through which the cartridge heater 30 can be inserted and a through hole through which the bolt 27 can be inserted.

  The cartridge heater 30 is, for example, one obtained by winding a heating wire such as a nichrome wire around a bobbin made of magnesium oxide, housed in a stainless steel cylindrical tube, and filled with magnesium oxide in the cylindrical tube. It differs from a so-called sheathed heater in that the heating wire is wound around the bobbin with a large diameter and high density and that both ends of the heating wire are drawn out from one end side of a stainless steel cylindrical tube. Therefore, the cartridge heater 30 can generate heat at a higher temperature than the sheathed heater. A stainless steel cylindrical tube corresponds to a heating element.

  The cartridge heater 30 according to the present embodiment mainly includes the main body 31, the plug 32, the protective cover 35, and the like, and can generate, for example, up to 600.degree. The cartridge heater 30 is attached to the housing 21 via a plate 25 so that the main body 31 is positioned substantially on the axis of the housing 21.

  The main body 31 is formed in a rod shape having a long cylindrical shape covered with a stainless steel cylindrical tube that accommodates the above-mentioned heating wire, filled magnesium oxide and the like. In the present embodiment, the length of the main body 31 is set to a size ranging from the one end 21 a side of the housing 21 to the other end 21 b side. At the proximal end of the main body 31, a plug 32 is provided which covers both ends of the heating wire drawn from the main body 31 and on which a taper screw 33 is formed.

  The tapered screw 33 of the plug 32 can be screwed to the female screw of the female screw hole formed in the radial center of the plate 25, so that the plug 32 is screwed to the plate 25, whereby the cartridge The heater 30 can be attached to the housing 21 via the plate 25. Further, since the tapered shape is expanded in diameter as the screwing progresses, the loosening of the screw is suppressed and the formation of a gap between both screw grooves of the female screw of the female screw hole and the male screw of the tapered screw 33 is suppressed and both are airtight. It becomes possible to make it adhere to a state. A protective cover 35 is connected to the plug 32 on the side opposite to the tapered screw 33. The protective cover 35 covers both ends (one end side and the other end side) of the heating wire drawn from the main body 31 and the connection portion of the wiring 19 connected thereto.

  The thin tube 40 is a cylindrical tube made of brass (brass), and in the present embodiment, the axial length is set to about 17 cm. In the present embodiment, when the thin tube 40 is housed in the housing 21, the one end 40 a of the thin tube 40 is positioned at the other end 21 b of the housing 21 than the introduction hole of the peripheral wall 21 c communicating with the input pipe 23, The axial length is set such that the other end 40 b of the capillary tube 40 is positioned closer to the one end 21 a of the housing 21 than the end of the main body 31 of the cartridge heater 30.

  Thus, the saturated water vapor flowing from the input pipe 23 is reduced compared to the case where the one end 40a of the thin tube 40 is positioned at the one end 21a of the housing 21 than the introduction hole of the peripheral wall 21c communicating with the input pipe 23. It is possible to reduce saturated water vapor passing through the outside of the thin tube 40 without flowing through the inside of the thin tube 40, since it is easy to lead to the one end 40a of the Therefore, the heating efficiency of saturated steam can be improved.

  Further, the thin tube 40 is accommodated in the housing 21 such that the outer peripheral wall thereof is in contact with the outer peripheral wall 31 a of the main body 31 of the cartridge heater 30. Further, the outer peripheral wall of the thin tube 40 is accommodated in the housing 21 so as to be in contact with the outer peripheral wall of another thin tube 40 adjacent thereto. The outer peripheral wall of the thin tube 40 also contacts the inner peripheral surface of the peripheral wall 21 c of the housing 21.

  In this embodiment, eight thin tubes 40 are accommodated in the housing 21 so as to surround the entire periphery of the main body 31 (see FIG. 3C). Although not shown, a rod made of brass, for example, is interposed in the gap formed between the thin tube 40 and the peripheral wall 21c. The cross section of this rod in the radial direction (the direction orthogonal to the longitudinal axis) is, for example, a circular tube, an elliptical tube, a rectangular tube, a polygonal tube such as a triangle, a pentagon, etc. 40 is formed in the shape which is hard to move to the radial direction. As a result, the thin tube 40 does not easily rattle within the housing 21 and the generation of noise that may occur when the superheated steam generator 20 vibrates is suppressed.

  By configuring the superheated steam generator 20 in this manner, when the main body 31 of the cartridge heater 30 generates heat, for example, at about 300 ° C., the heat is directly applied to the plurality of thin tubes 40 disposed around the main body 31. It is transmitted. Therefore, when the saturated steam introduced from the inlet 23 a of the input pipe 23 flows into the pipe from one end 40 a of these capillaries 40 and contacts the inner circumferential wall of the capillaries 40, the heat of the main body 31 passes through the capillaries 40. Since the heat is transferred to the saturated steam, the saturated steam body is heated, for example, at 250 ° C. to 290 ° C. As a result, the steam flowing out of the other end 40b of the capillary tube 40 becomes superheated steam, so the superheated steam is discharged from the outlet 24a of the output pipe 24 (broken line with arrows shown in FIG. 5).

  In the housing 21, heat is also transferred to the saturated steam when the saturated steam comes in contact with the outer circumferential wall of the thin tube 40 on the outside of the capillary 40, and such saturated steam is also For example, it is heated to about 250.degree. Thereby, the steam flowing out from the other end 40b along the outer peripheral wall of the capillary 40 also becomes superheated steam, so the superheated steam is discharged from the discharge port 24a of the output pipe 24.

  Furthermore, since the outer peripheral wall of the thin tube 40 also contacts the inner peripheral surface of the peripheral wall 21 c of the housing 21, part of the heat generated by the main body 31 is transmitted to the peripheral wall 21 c via the thin tube 40. Therefore, in the housing 21, since the saturated steam flowing through the outside of the thin tube 40 comes into contact with the inner peripheral surface of the peripheral wall 21c and the heat is transferred to the saturated steam, such saturated steam is also, for example, around 250 ° C. It is heated to As a result, the steam flowing out from the other end 21b along the inner peripheral surface of the peripheral wall 21c of the housing 21 also becomes superheated steam, so the superheated steam is discharged from the discharge port 24a of the output pipe 24.

  In the present embodiment, the thin tube 40 is made of brass (brass). This makes it possible to reduce the cost of parts of the thin tube 40 as compared to the case where the thin tube 40 is made of stainless steel. This is because brass (brass) is generally lower in cost and higher in thermal conductivity than stainless steel. Further, it is also possible to efficiently transmit the generated heat of the main body 31 to the narrow tube 40 and the peripheral wall 21 c of the housing 21. Although the thermal conductivity of brass depends on the distribution of copper and zinc being mixed, it is significantly higher than the thermal conductivity of stainless steel (16.7 to 20.9) (from 106 for brass) It is. The unit of thermal conductivity is [W / (m · K)] (W (watt), m (meter), K (Kelvin)).

  The melting temperature of brass also depends on the proportion of copper and zinc being mixed, and although generally about 800 ° C., it may be denatured or softened at around 400 ° C. Therefore, in the present embodiment, the upper limit of the heat generation temperature of the cartridge heater 30 is set in advance to 350 ° C., and the control device 17 controls the main body 31 so that the heat generation temperature becomes 350 ° C. or less. The superheated steam generator 20 of the present embodiment does not have a temperature sensor as understood from the respective drawings. Therefore, in the present embodiment, for example, the resistance value of a heating wire such as a nichrome wire constituting the cartridge heater 30 is measured instead of the temperature sensor, and the heat generation temperature of the main body 31 is estimated from the resistance value.

  More specifically, the control device 17 intermittently supplies drive power to the cartridge heater 30, and measures the resistance value of the heating wire of the main body 31 during a period in which the drive power is not supplied. Then, the heat generation temperature of the main body 31 is estimated using a predetermined map set in advance, using the resistance value obtained by this measurement. For example, when a period during which the drive power is not supplied occurs at intervals of 2 minutes for 5 seconds, the resistance value of the heating wire of the main body 31 is measured during the 5 seconds to estimate the heat generation temperature of the main body 31. The measurement of the resistance value may be performed multiple times to improve the measurement accuracy.

  The predetermined map measures, for example, the resistance value of the heating wire of the main body 31 with respect to the surface temperature (for example, 300 ° C. to 500 ° C.) of the outer peripheral wall 31 a of the main body 31 . Standard reference data is created based on the data of the predetermined number of samples obtained by this, and the correspondence relation (the correspondence relation between the resistance value of the heating wire of the main body 31 and the heat generation temperature of the main body 31) is predetermined. The heat generation temperature of the main body 31 is used for estimation by storing the map in advance in the memory of the control device 17.

  The resistance value Rh of the heating wire is, for example, an electric potential difference Vd (analog value) obtained by supplying a current I of a predetermined value (known) to the heating wire of the main body 31 through the wiring 19 as an A / D converter. It can be obtained by converting into digital values by the like and calculating Vd / I (= Rh).

  By controlling the heat generation temperature of the cartridge heater 30 in this manner, the capillary 40 can be maintained at an optimum temperature state, so that, for example, the capillary 40 is softened or denatured even if the capillary 40 is made of brass. It is also possible to prevent or suppress deterioration due to oxidation. In addition, it is possible to extend the life of the heating wire of the cartridge heater 30 and to prevent the cartridge heater 30 from being exhausted.

  As explained above, the superheated steam generator 20 of the present embodiment has the input pipe 23 for introducing saturated steam at one end 21a side of the housing 21 and the output pipe 24 for discharging the superheated steam to the other end 21b. And a rod-shaped main body 31 of the cartridge heater 30 housed in the housing 21 and extending from one end 21a side to the other end 21b side of the housing 21 and around the main body 31 in the housing 21; A plurality of thin tubes 40 disposed in contact with the outer peripheral wall 31a of the above, and the saturated steam introduced from the input pipe 23 into the housing 21 enters from one end 40a side and heated superheated steam exits from the other end 40b side; Prepare.

  In the superheated steam generator 20, the main body 31 of the cartridge heater 30 is in the shape of a rod extending from the one end 21 a side to the other end 21 b side of the housing 21, and a plurality of thin tubes 40 form the outer peripheral wall 31 a of the main body 31 around the main body 31. Placed in contact with Thus, the heat generated by the heat generation of the main body 31 is directly transmitted to the plurality of thin tubes 40 disposed around the main body 31. Further, the thin tube 40 is disposed so as to surround the entire periphery of the main body 31 of the cartridge heater 30.

  Thus, for example, as described in the section of [Background Art], an outer peripheral heater type configuration in which a bundle of a plurality of bundled heating tubes is covered with a cylindrical outer wall portion and a heater is wound around the outer wall portion Reference 1; JP-A-2017-101910) or a plurality of thin stainless steel thin tubes are bundled and the periphery is covered with a cylindrical heating tube, and a heat insulating material is interposed on the outer periphery of the heating tube to wind the heating coil. Compared to the configuration of the induction heating type (Patent Document 2; JP-A-2006-40714), the heat transmitted to spread outside the main body 31 is effectively used. Therefore, since the heating efficiency is improved, the physique of the device can be significantly reduced as compared with the configurations of Patent Documents 1 and 2. In other words, since the physique of the device is significantly reduced, the diffusion of heat that does not contribute to the heating of the capillary tube 40 is suppressed and the heating efficiency is improved as compared with the case where the physique is large. Therefore, it is possible to heat the saturated water vapor flowing through the plurality of capillaries 40 while having a simple configuration.

  Therefore, the device configuration can be simplified. Moreover, since it is not necessary to wind a heater or a coil around a bundle of a plurality of thin tubes 40, it is not necessary to accommodate a cylindrical tube or the like covering the bundle of thin tubes 40 in the housing 21. Therefore, it is also possible to reduce the number of parts. Therefore, the product cost can be reduced.

  In the superheated steam generator 20 of the embodiment described above, a configuration is adopted in which the plurality of thin tubes 40 are disposed around the main body 31 so as to contact the (main peripheral wall 31a) of the main body 31 of the cartridge heater 30. A plurality of thin tubes 40 may be disposed in the vicinity of the outer peripheral wall 31a without directly contacting the outer peripheral wall 31a. In the case of this configuration, the heat resistance between the main body 31 and the narrow tube 40 is increased as compared with the configuration in which the plurality of thin tubes 40 are disposed in contact with the outer peripheral wall 31 a, and therefore the heating efficiency of saturated steam is reduced. However, since it is possible to increase the diameter of the circumference where the capillaries 40 can be disposed, it is possible to, for example, increase the disposition density of the capillaries 40 or improve the degree of freedom of the disposition.

  Further, for example, as shown in FIG. 6A, the inner tube 50 is covered with a plurality of thin tubes 40 arranged around the main body 31, and a plurality of thin tubes 43 are further arranged around the inner tube 50. It is also good. In the case of this configuration, the inner circumferential surface of the inner tube 50 is in contact with the outer circumferential wall of the plurality of thin tubes 40. Further, the outer peripheral surface of the inner tube 50 is in contact with the outer peripheral wall of the plurality of thin tubes 43 arranged around the inner tube 50. Furthermore, the outer peripheral wall of the plurality of thin tubes 43 is in contact with the outer peripheral surface of the inner tube 50 and also in contact with the inner peripheral surface of the peripheral wall of the housing 121 (corresponding to the housing 21 of the above embodiment). In addition, the thin tube 43 is also made of brass, and the axial diameter and axial length thereof are set in the same manner as the thin tube 40 of the above-described embodiment. Moreover, the housing 121 is stainless steel, and differs from the housing 21 of the above-mentioned embodiment in that the diameter is set larger than the housing 21.

  Furthermore, for example, as shown in FIG. 6B, a plurality of thin tubes 45 having a diameter larger than that of the thin tube 40 may be arranged around the bundle of the plurality of thin tubes 40 arranged around the main body 31. In this configuration, the capillary 45 is made of brass, and its axial diameter (length in the direction orthogonal to the longitudinal axis) is set to, for example, about twice that of the capillary 40. Moreover, the axial length of the thin tube 45 is set similarly to the thin tube 40 of the above-mentioned embodiment. The outer peripheral wall of the plurality of thin tubes 45 is in contact with the outer peripheral wall of the thin tube 40 and also in contact with the inner peripheral surface of the peripheral wall of the housing 221 (corresponding to the housing 21 of the above embodiment). The housing 221 is made of stainless steel, and has a diameter larger than that of the housing 21. Further, the thickness of the housing 221 is larger than that of the housing 21 of the above-described embodiment.

  As in the configuration example (modification) shown in FIG. 6 (A) and FIG. 6 (B), the cartridge heater 30 is further arranged by arranging a plurality of thin tubes 43 and thin tubes 45 around the bundle of the plurality of thin tubes 40. The heat generated by the heat generation of the main body 31 is also transmitted to the plurality of thin tubes 43 and 45 arranged around the bundle of the plurality of thin tubes 40. Therefore, it is possible to heat the saturated water vapor flowing in the thin tubes 43, 45 as well. That is, since the thin tubes 43 and 45 are provided, the flow rate of the saturated steam increases. Therefore, the flow rate of saturated steam that can be heated can be increased.

  In the configuration example (modification) shown in FIG. 6 (A) and FIG. 6 (B), it is conceptualized that the plurality of thin tubes 40 arranged around the main body 31 constitute a single layer (one step). In addition, it can be conceptualized that the thin tube 43 and the thin tube 45 disposed around the double side constitute a double (second stage) eye. Such multi-stage configuration is limited as long as the heat generated by the main body 31 is transmitted within a temperature range (for example, 150 ° C. or 200 ° C.) effective for generating the superheated steam according to the device specification of the superheated steam generator 20 For example, three (three), four (four), or five (five) may be used.

  Further, in the superheated steam generator 20 of the above-described embodiment and the modified example thereof, the thin tubes 40, 43, 45 are made of brass (brass), but for example, if the material is less expensive than stainless steel, for example, Other metal materials such as aluminum and non-metal materials may be used.

  The capillaries 40, 43, 45 may be made of stainless steel. Although the cost of the thin tube itself increases as compared with the case where these thin tubes are made of brass, in the present embodiment, the thin tubes 40, 43, 45 are provided to surround the entire periphery of the main body 31 of the cartridge heater 30. It is arranged. As a result, compared with the configuration of the outer peripheral heater type of Patent Document 1 and the configuration of the induction heating type of Patent Document 2, the heat transmitted to spread outside the main body 31 is effectively used. Therefore, since the heating efficiency is improved, the physique of the device can be made significantly smaller than the configurations of Patent Documents 1 and 2. In other words, since the physical size of the device is significantly reduced, the diffusion of heat that does not contribute to the heating of the capillaries 40, 43, 45 is suppressed and the heating efficiency is improved, as compared to the case where the physical size is large.

  Therefore, as compared with the configurations of Patent Literatures 1 and 2, since the device becomes smaller, necessary metal materials and the like are reduced, which leads to a reduction in product cost. Further, even in the case where the thin tubes 40, 43, 45 are made of stainless steel, the apparatus configuration can be simplified, so that the number of parts can be reduced and the product cost can be reduced.

  Further, by making the thin tubes 40, 43, 45 of stainless steel, these thin tubes can be heated to the heat generation upper limit temperature (for example, 600 ° C.) of the cartridge heater 30, so saturated steam can be heated at a higher temperature. It is then possible to generate high temperature superheated steam close to 600.degree. By suppressing the heat generation temperature of the cartridge heater 30 (for example, 300 ° C.), it is possible to extend the life of the stainless steel thin tubes 40, 43, 45.

  Furthermore, in the superheated steam generator 20 of the above-described embodiment and the modification thereof, the housings 21, 121 and 221 are formed of cylindrical tubes (cylindrical tubes), but the shape of the radial cross section of the tubes is limited to a circle. For example, the shape may be any shape such as a polygonal shape such as a quadrangular shape, a pentagonal shape, or a hexagonal shape, or a deformed circular shape such as an elliptical shape or an oval (elliptical) shape. The thin tubes 40, 43, 45 are also formed of cylindrical tubes (cylindrical tubes), but the shape of the radial cross section of the tubes is not limited to a circle, and for example, square, pentagonal, hexagonal You may comprise in arbitrary shapes, such as polygonal shape, such as a shape, elliptical shape, and deformation circular shape, such as an oval (elliptical) shape.

  Furthermore, in the superheated steam generator 20 of the above-described embodiment and the modified example thereof, the main body 31 of the cartridge heater 30 is configured to be positioned substantially on the axis of the housings 21, 121 and 221 (cylindrical body) The main body 31 of the cartridge heater 30 may be disposed at a position deviated from the axis of these cylinders. When a plurality of cartridge heaters 30 are used, for example, the other cartridge heaters 30 are disposed such that the main bodies 31 of the other cartridge heaters 30 are positioned on the circumference where the thin tubes 40, 43, 45 are disposed. You may

  Furthermore, the two housings 21 are connected in a radial direction so that the cartridge heater can be mounted on substantially the axis of each of the housings 21 as in the radial cross-sectional shape of the feeder wire in the radial direction (direction orthogonal to the longitudinal axis) of the glasses feeder. You may take the structure which arrange | positions the main body 31 of thirty. As a result, it becomes possible to heat the capillary tube 40 by the two cartridge heaters 30, and the number of capillary tubes 40 is also increased, so that the flow rate of saturated steam can be significantly increased. The amount can be increased.

  As mentioned above, although the specific example of this invention was described in detail, these are only an illustration and do not limit a claim. The art set forth in the claims includes various variations or modifications of the specific examples described above. In addition, the technical elements described in the present specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Furthermore, the techniques illustrated in the present specification or the drawings simultaneously achieve a plurality of purposes, and achieving one of the purposes itself has technical utility. In addition, the description in the parenthesis in the column of [Description of Symbol] can clearly indicate the correspondence between the terms used in the above-described embodiments and the terms described in the claims.

DESCRIPTION OF SYMBOLS 10 ... Superheated steam generation system 11 ... Housing | casing 12 ... Boiler apparatus 17 ... Control apparatus 20 ... Superheated steam generation apparatus 21 ... Housing (cylindrical body)
21c ... peripheral wall (peripheral wall of cylinder)
23: Input pipe (introduction part)
24 ... Output pipe (discharge part)
30 ... cartridge heater 31 ... main body (heating element)
31a ... outer peripheral wall (outer peripheral wall of heating element)
40 ... capillary (heating tube)
43, 45 ... capillary tube (second heating tube)
50 ... inner pipe

Claims (3)

A superheated steam generator for heating saturated steam to generate superheated steam, comprising
A cylindrical body having an introduction portion for introducing the saturated steam at one end and a discharge portion for discharging the superheated steam at the other end;
A rod-shaped heating element accommodated in the cylinder and extending from the one end side of the cylinder to the other end side;
The saturated steam, which is disposed around the heating element in the cylinder, in contact with the outer circumferential wall of the heating element or in the vicinity of the outer circumferential wall, is introduced from one end to the saturated steam introduced from the introducing portion into the cylinder A plurality of heating tubes from which the superheated steam is discharged from the other end;
A superheated steam generator comprising:   In the cylinder, a plurality of second heating pipes are disposed around the bundle of the plurality of heating pipes, in which the saturated steam enters from one end and the superheated steam exits from the other end. The superheated steam generator according to claim 1.   The superheated steam generator according to claim 1 or 2, wherein the plurality of heating tubes are made of brass.

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