JP2008190785A - Steam generating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a steam generating device capable of effectively capturing liquid droplets having a fine particle diameter and evaporating the same. <P>SOLUTION: This steam generating device 10 comprises a steam generator 12 including a steam generating portion 18 for vaporizing liquid, a steam trap 30 sectioning a downstream-side steam flow channel 36 of the steam generating portion 12 into a number of flow channels by a number of partitions 34, and a temperature control portion 38 for keeping a surface temperature of the steam trap 30 to be higher than a lower limit temperature generating Leidenfrost phenomenon. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vapor generating device for generating vapor by vaporizing a liquid.

A reformer is known in which an evaporation section and a superheat section are communicated with each other by a U-turn section made of a bellows pipe, and a guide for suppressing the movement of droplets is disposed in the U-turn section (for example, Patent Documents). 1). In this technology, the droplet flying from the evaporation part to the super heat part is dropped by the guide onto the lower wall surface of the U-turn part (bellows pipe) and brought into contact with the bellows concave part of the lower wall surface of the U-turn part. It is designed to evaporate.
JP 2004-224621 A

  By the way, an evaporator having a large number of flow paths having a fine representative diameter has been developed from the demand for improvement in evaporation characteristics and heat exchange efficiency. The droplets that have passed through such a fine channel have a small particle size and high followability with respect to the vapor flow, and therefore are difficult to capture with the conventional guide and bellows pipe as described above. That is, although the conventional techniques as described above are effective for capturing a relatively large-sized droplet, there is room for improvement in capturing a small-sized droplet having high followability to the vapor flow.

  In view of the above fact, an object of the present invention is to obtain a vapor generating apparatus capable of effectively capturing and evaporating droplets having a fine particle diameter.

  The steam generator according to the invention of claim 1 is a steam generator for vaporizing a liquid, a flow path partitioning body that divides a steam flow path downstream of the steam generator into a plurality of flow paths, Temperature control means for maintaining the surface temperature of the flow path partition body at or above the lower limit temperature at which the liquid droplets cause the Leidenfrost phenomenon.

  In the steam generator according to claim 1, the liquid is vaporized in the steam generating unit to generate steam, and the steam passes through the flow path partitioned by the flow path partition body and is discharged (supplied) outside the apparatus. The Here, since the flow path partition is maintained at a temperature equal to or higher than the lower limit temperature at which the Leidenfrost phenomenon occurs by the temperature control means, when a droplet that is not vaporized flows out of the steam generator, the liquid droplet is separated from the flow path partition. Can be captured by the vapor film generated during The Leidenfrost phenomenon is a phenomenon in which a vapor film is generated between a droplet and a heating surface in a broad sense, and the lower limit temperature at which the Leidenfrost phenomenon occurs is grasped as a predetermined temperature exceeding the saturation temperature of the substance. can do. As an aspect in which the liquid droplets are captured, for example, an aspect in which a liquid droplet having a particle diameter equal to or smaller than the representative diameter of the flow path formed between the flow path partition bodies is captured between the flow path partition bodies is It is conceivable that a droplet having a particle diameter exceeding the representative diameter of the channel formed between the bodies is captured at the end of the channel partition. The liquid droplets captured by the flow path partition body can be gradually evaporated from the outer periphery by the heat supply from the flow path partition body (temperature control means) and can be completely vaporized.

  Thus, in the steam generator according to the first aspect, it is possible to effectively capture and evaporate droplets having a fine particle diameter. For example, in a configuration in which the steam flow path of the steam generation unit is partitioned into a large number of fine flow paths by the partition wall, the flow path partition body may be configured continuously from the partition wall of the steam generation unit. .

  The steam generator according to a second aspect of the present invention is the steam generator according to the first aspect, wherein the flow path partition has a representative diameter of the flow path partitioned by the flow path partition. It arrange | positions so that the upstream side may become below the diameter of the said droplet which flies.

  In the steam generating device according to claim 2, the particle diameter range of the droplets that can be generated in the steam generating section is estimated by the specification of the steam generating section, and a plurality of flow paths having a representative diameter smaller than the lower limit of the particle diameter range By arranging the flow path partition bodies so as to be partitioned into two, the droplets can be reliably captured before entering between the flow path partition bodies (at the end of the flow path partition body). As a result, the droplets are prevented from passing between the flow path partition bodies, and the droplets having a fine particle diameter can be captured and evaporated more effectively. Furthermore, the vapor film generated as the captured droplets (particles) are vaporized has an effect of further preventing (inhibiting) the passage of the droplet particles.

  The steam generator according to a third aspect of the present invention is the steam generator according to the first or second aspect, wherein the steam generator heats a peripheral wall of a flow path having a fine representative diameter, The liquid supplied to the flow path is vaporized, and the flow path partition body has a representative diameter of the flow path defined by the flow path partition body that is equal to or less than a representative diameter of the flow path in the steam generation unit. Are arranged to be.

  In the steam generator according to claim 3, the vapor generation is performed by heating the peripheral wall of the flow path having a fine representative diameter in the steam generation section. Therefore, the droplets flying from the vapor generating part have a particle diameter equal to or smaller than the representative diameter. Here, since the representative diameter of the flow path defined by the flow path partition for capturing the liquid droplet is equal to or smaller than the representative diameter of the flow path in the steam generating section, the liquid droplet from the steam generating section is allowed to pass through the vapor film. Can be captured reliably.

  The steam generator according to a fourth aspect of the present invention is the steam generator according to any one of the first to third aspects, wherein the flow path defined by the flow path partition body is steam from above in the direction of gravity. Is arranged to flow in.

  In the steam generator according to claim 4, since the flow path partition is disposed with the upstream end directed upward in the direction of gravity, the liquid having a particle diameter larger than the representative diameter of the flow path defined by the flow path partition Drops can be reliably captured and evaporated above the end of the channel compartment while balancing gravity and vapor film forces (so that they do not escape to other parts). In particular, as in claim 2, it is preferable that the representative diameter of the flow path defined by the flow path partitioning body is equal to or smaller than the particle diameter of the droplet.

  A steam generator according to a fifth aspect of the present invention is the steam generator according to any one of the first to fourth aspects, wherein the steam generator vaporizes the supplied water. The temperature control means keeps the surface temperature of the flow path partition body at 160 ° C. or higher.

  In the steam generating device according to claim 5, since the temperature of the flow path partition body is 160 ° C. or higher, when a water droplet comes close to the flow path partition body, for example, the water drop may break or dance due to instability of the vapor film. The water droplets are prevented from closing at a specific part of the flow path.

  The steam generator according to a sixth aspect of the present invention is the steam generator according to any one of the first to fifth aspects, wherein the temperature control means determines the surface temperature of the flow path partition body as the Leidenfrost temperature. To keep below.

  In the steam generator according to claim 6, since the temperature of the flow path partition body is equal to or lower than the Leidenfrost temperature, it is possible to prevent the liquid droplet from shifting to a spheroid state (spheroid state) that is stationary in a spheroid shape. . For this reason, it is prevented that a specific flow path closes among a plurality of flow paths which a flow path division object partitions.

  As described above, the steam generating apparatus according to the present invention has an excellent effect that droplets having a fine particle diameter can be effectively captured and evaporated.

  A steam generator 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a schematic diagram showing a schematic overall configuration of the steam generator 10. As shown in FIG. 1, the steam generator 10 includes a steam generator 12. The steam generator 12 evaporates the liquid supplied from the liquid tank 14 by the pump 16 and generates a steam, and a heating unit for heating the steam generating unit 18 (supplying evaporation line heat). 20 is configured as a heating type evaporator.

  As shown in FIG. 5, the steam generation unit 18 is divided into a large number of fine flow paths 18 </ b> A in which the internal space of the steam generation pipe 22 formed in a substantially rectangular tube shape has a fine representative diameter De by a large number of partition walls 24. And is configured as a microchannel evaporator that vaporizes a liquid by heat transmitted from the heating unit 20 via the steam generation pipe 22 and a number of partition walls 24 (and a buffer gas flow path 26 described later). Yes.

  Further, in this embodiment, a buffer gas flow path 26 is provided between the steam generation unit 18 and the heating unit 20, and for example, gas used in a device to which the steam generation device 10 is applied is allowed to pass. Preheated or heated. In this way, by interposing the buffer gas flow path 26 between the steam generation unit 18 and the heating unit 20, the steam generator 12 supplies the liquid supply amount and heat supply to the steam generation unit 18 in order to change the steam generation amount. When the amount is changed, the buffer gas flow path 26 absorbs a rapid temperature change of the steam generation unit 18.

  Note that the steam generator 10 is configured to change the liquid supply amount by the pump 16 and the heat supply amount by the heating unit 20 in response to a change request of the steam generation amount by a controller (not shown). Further, as shown in FIG. 5, the buffer gas flow path 26 is composed of a number of partition walls 28 that also function as heat transfer paths from the heating unit 20 to the buffer gas flow path 26 and the steam generation unit 18, and a gas flow pipe 29. The internal space is partitioned into a large number of fine gas flow paths 26A.

  Further, a droplet trap 30 is communicated with the steam outlet 18 </ b> B of the steam generator 18 of the steam generator 12. As shown in FIGS. 2 and 3, the droplet trap 30 has a large number of internal spaces of a vapor flow path forming tube 32 formed in a substantially rectangular frame (cylinder) shape with a flow path partition wall 34 as a flow path partition body. Are divided into fine flow paths 30A having a fine representative diameter Dt. The steam trap 30 or the partition wall 34 corresponds to the flow path partition body in the present invention.

  The representative diameter Dt of the fine flow path 30A constituting the droplet trap 30 is set to be equal to or smaller than the representative diameter De of the fine flow path 18A constituting the vapor generating unit 18. The representative diameter (representative length) D of a rectangular channel such as the fine channel 18A and the fine channel 30A is D = 4 × S / L, where S is the channel cross-sectional area and L is the wetting length. It becomes. When the aspect ratio of the fine flow path 18A and the fine flow path 30A, which are rectangular flow paths, is 16 or more, the representative diameter D (De, Dt) is approximately equal to the cross section of the flow path in the vapor flow direction view. The short side length can be as follows.

  In this embodiment, the representative diameter Dt of the droplet trap 30 reaches the vapor channel 36 between the vapor generator 18 and the droplet trap 30 without being evaporated by the vapor generator 18, and the vapor channel 36 The particle diameter Dd of the flying droplet d is set to be equal to or less. More specifically, the range of the particle diameter Dd of the droplets discharged from the fine flow path 18A of the steam generation unit 18 depends on the representative diameter De of the fine flow path 18A and can be estimated from the representative diameter De. it can. When the fine channel 18A has a sufficient channel length, the relationship of particle diameter Dd <representative diameter De is established (in this embodiment, the particle diameter Dd is on the order of submillimeters and several millimeters). As shown in FIG. 4, the representative diameter Dt of the microchannel 30 </ b> A constituting the droplet trap 30 is equal to or less than the lower limit particle diameter of the particle diameter Dd (range) estimated from the representative diameter De of the steam generation unit 18. Is set as In FIG. 4, for the sake of convenience, the representative diameter Dt of the fine channel 30A is illustrated as the short side length of the fine channel 30A.

  The droplet trap 30 described above is arranged in such a posture that the upstream end 30B in the vapor flow direction faces upward in the gravity direction. In this posture, the droplet trap 30 has a surface temperature T of the flow path partition wall 34 and the vapor flow path forming pipe 32 that is equal to or higher than the predetermined temperature Tl and separately equal to or lower than the predetermined temperature Tu (Tl) by a temperature control unit 38 as temperature control means. ≦ T ≦ Tu). The predetermined temperature Tl is set as a lower limit temperature at which the droplet d flying in the steam flow path 36 without being evaporated by the steam generating unit 18 causes the Leidenfrost phenomenon, and the predetermined temperature Tu is separately set as the Leidenfrost temperature. ing.

  This Leidenfrost phenomenon and Leidenfrost temperature will be supplemented based on FIG. FIG. 6 is a graph showing the relationship between the fixed surface temperature and the life of the droplet (time consumed for evaporation) when the liquid (water in this example) evaporates on the solid surface. From this figure, when the liquid evaporates on the solid surface, the droplet life is shortened as the solid surface temperature rises. It can be seen that there are a temperature region B that becomes longer and a temperature region C that continues to the high temperature side of the temperature region B and whose droplet life becomes longer as the solid surface temperature increases.

  In temperature region A, the droplets adhere to the fixed surface and cause lenticular evaporation. In the temperature region B, a vapor film (bubble) is partially generated as the droplets evaporate, and the droplets behave intermittently in contact with the solid surface and dance on the solid surface. Along with this dance-like behavior, the droplets may break up. As a result, the droplet life becomes longer as the solid surface temperature increases. In the temperature region C, the droplets are supported (floated) by the vapor film and transition to a spheroid state where they evaporate while still being a spheroid (showing a spheroid state phenomenon).

  In a broad sense, the phenomenon (temperature regions B and C) in which a vapor film is formed between the droplet and the solid surface is the Leidenfrost phenomenon, and the temperature at which the lifetime of the droplet is maximized is the Leidenfrost temperature. is there. In a narrow sense, the behavior of a droplet in the temperature region B below the Leidenfrost temperature may be referred to as a Leidenfrost phenomenon. In any case, the predetermined temperature Tl that is the lower limit temperature at which the droplet d causes the Leidenfrost phenomenon is set as the lower limit temperature of the temperature region B, and the additional predetermined temperature Tu that is the Leidenfrost temperature is the upper limit ( It is set as the temperature of the boundary with the temperature region C).

  Therefore, when the liquid evaporated by the steam generator 10 is water at approximately atmospheric pressure, as shown in FIG. 6, the surface temperature T of the steam flow path forming pipe 32 and the flow path partition wall 34 of the droplet trap 30 is the temperature. The controller 38 controls (manages) 160 ° C. ≦ T ≦ 300 ° C. In this embodiment, the temperature control unit 38 can be grasped as a heating device that heats the steam flow path forming tube 32 and the flow path partition wall 34 of the droplet trap 30. For example, a signal corresponding to the surface temperature of the steam trap 30. The surface temperature T of the vapor flow path forming tube 32 and the flow path partition wall 34 of the droplet trap 30 is maintained in the above range by performing feedback control based on a signal from a temperature sensor (not shown) that outputs the signal.

  Next, the operation of the first embodiment will be described by taking the case where the liquid to be evaporated is water as an example.

  In the steam generator 10 having the above-described configuration, the pump 16, the heating unit 20, and the temperature control unit 38 are activated by activation. Then, the water in the liquid tank 14 is supplied to the steam generation unit 18 by the pump 16. The steam generation unit 18 receives heat supply from the heating unit 20 via the buffer gas flow path 26 and evaporates the supplied water. The steam is discharged from the steam outlet 18B of the steam generating unit 18, and is supplied to, for example, a steam consuming apparatus through the steam flow path 36 and the droplet trap 30.

  By the way, in the steam generator 10, as shown in FIG. 2, the water droplet d is discharged from the steam outlet 18 </ b> B in a state where it is not vaporized due to bumping or pressure fluctuation in the steam generator 18, and flies through the steam channel 36. There is.

  Here, in the steam generation device 10, the representative diameter Dt of the fine flow path 30 </ b> A of the droplet trap 30 is equal to or smaller than the particle diameter Dd of the water droplet d, and a large number of vapor flow path forming pipes 32 constituting the droplet trap 30 are disposed inside. Since the surface temperature T of the flow path partition wall 34 and the vapor flow path forming pipe 32 partitioned into the fine flow path 30A is 160 ° C. ≦ T ≦ 300 ° C., it flies through the vapor flow path 36 and the upstream end 30B of the droplet trap 30. The water droplet d that has reached is captured by the upstream end 30B of the droplet trap 30 through the vapor film. That is, the discharge in the liquid state downstream (supply to the steam consuming apparatus) is prohibited.

  Since the surface temperature T of the flow path partition wall 34 constituting the droplet trap 30 is controlled to a temperature corresponding to the temperature region B of FIG. 6, in other words, the temperature at which the water droplet d causes a narrow Leidenfrost phenomenon. Since the surface temperature of the flow path partition wall 34 is controlled, the water droplet d behaves in such a way that it splits into several parts or dances due to the instability of the vapor film, and on the surface of the upstream end 30B of the droplet trap 30. While being moved between the flow path partition walls 34, it is gradually evaporated by supplying heat from the temperature control unit 38 via the flow path partition walls 34. In particular, since the droplet trap 30 is arranged in a posture in which the upstream end 30B in the vapor flow direction faces the upper side in the direction of gravity, for example, the water droplet d as in a configuration in which the vapor flow direction is arranged along the horizontal direction. Can be reliably captured and evaporated without escaping to the lower side of the steam flow path 36 in the direction of gravity.

  Thus, in the steam generator 10 according to the first embodiment, it is possible to effectively capture and evaporate the droplet (water droplet) d having a fine particle diameter. Thereby, the droplet d is completely vaporized, and it is possible to effectively prevent the droplet from being supplied to the vapor consuming apparatus.

  In the steam generator 10, since the upper limit of the surface temperature T of the droplet trap 30 is controlled to be equal to or lower than the Leidenfrost temperature, the water droplet d may transition to the spheroid state on the upstream end 30 </ b> B of the droplet trap 30. Is prevented. As a result, the water droplet d captured by the droplet trap 30 moves along the upper surface of the upstream end 30B of the droplet trap 30 or moves so as to dance, so that the vapor flow in the specific microchannel 30A. Will not be disturbed. For this reason, it is possible to prevent a local low temperature portion from being generated in the droplet trap 30 that forms a part of the vapor flow path, and the occurrence of uneven vapor concentration in the numerous fine flow paths 30A.

  Next, the steam generator 50 which concerns on the 2nd Embodiment of this invention is demonstrated based on FIG.7 and FIG.8. Note that parts and portions that are basically the same as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and description thereof is omitted, and illustration may be omitted.

  In FIG. 7, a schematic overall configuration of the steam generator 50 is shown in a schematic diagram. As shown in this figure, the steam generator 50 includes a steam generator 54 in which a superheater 52 is sandwiched between the steam generator 18 and the heating unit 20 in place of the steam generator 12. This is different from the steam generator 10 according to the embodiment. This will be specifically described below.

  The steam generation device 50 includes a U-turn flow path member 56 that forms a U-turn flow path 56A for communicating the steam outlet 18B of the steam generation section 18 and the steam inlet 52A of the superheat section 52. As shown in FIG. 8, the superheat part 52 functions as a heat transfer path from the heating part 20 to the superheat part 52 itself and the steam generation part 18, similarly to the buffer gas flow path 26 in the first embodiment. A large number of partition walls 28 divide the internal space of the superheat steam flow pipe 58 into fine superheat steam gas flow paths 58A.

  In this embodiment, the vapor inlet 52 </ b> A (at least a part on the upstream end side) in the superheat unit 52 is the droplet trap 30. Specifically, the representative diameter Dt of the superheat steam gas flow path 58A is set to be equal to or smaller than the representative diameter De of the fine flow path 18A constituting the steam generation unit 18, and the liquid flying through the U-turn flow path member 56 is used. It is set to the particle diameter Dd or less of the droplet d.

  Furthermore, the superheater 52 is disposed in such a posture that the steam inlet 52A, which is the upstream end in the steam flow direction, faces upward in the gravity direction. The heating unit 20 in this embodiment is configured to keep the surface temperature of the superheat steam flow pipe 58 and the partition wall 28 at or above the predetermined temperature Tl and separately below the predetermined temperature Tu (Tl ≦ T ≦ Tu). ing.

  Therefore, in the steam generator 50, it can be grasped that the droplet trap 30 is integrally incorporated in the steam generator 54, and the heating unit 20 is also configured as the temperature control unit 38. Other configurations of the steam generator 50 are the same as the corresponding configurations of the steam generator 10.

  Therefore, the steam generator 50 according to the second embodiment can basically obtain the same effect by the same operation as the steam generator 10 according to the first embodiment. That is, in the steam generator 50, it is possible to effectively capture and evaporate droplets having a fine particle diameter.

  In the steam generator 50, the steam inlet 52A (upstream end surface in the steam flow direction) of the superheat section 52 is mainly used as the droplet trap 30, so that the droplet trap 30 is configured without increasing the number of parts. be able to. Thereby, the steam generator 50 can be configured more compactly than the steam generator 10.

  In the above-described second embodiment, an example in which the heating unit 20 performs temperature control (management) of the droplet trap 30 has been described. However, the present invention is not limited to this, and is independent of the heating unit 20, for example. The temperature control unit 38 may control the temperature of the droplet trap 30 (for example, a part on the upstream end side of the superheat unit 52).

  Further, in the above-described second embodiment, the example in which the droplet trap 30 is provided integrally with the superheat portion 52 has been described. However, the present invention is not limited to this, and for example, separate from the superheat portion 52. The droplet trap 30 may be provided on the steam inlet 52A of the superheater 52. In this configuration, the representative diameter Dt can be set independently of the length of the superheater 52 and the representative diameter (arrangement of the partition walls 28).

  Further, in each of the embodiments described above, an example in which the representative diameter Dt of the droplet trap 30 is equal to or smaller than the particle diameter Dd of the droplet d is shown, but the present invention is not limited to this. The representative diameter Dt may be equal to or larger than the particle diameter Dd of the droplet d. Even in this case, by managing the surface temperature of the flow path partition wall 34 in the temperature region B in which the Leidenfrost phenomenon in a narrow sense occurs, the liquid droplet d does not simply pass through the liquid droplet trap 30, and the flow path partition wall It gradually evaporates while rolling on 34 and dancing. In this case, the extending direction of the flow path partition wall 34 (the vapor flow direction of the fine flow path 30A) may be inclined with respect to the gravity direction or may be horizontal.

  Furthermore, in each of the above-described embodiments, an example is shown in which the vapor flow path forming pipe 32 is partitioned into a large number of fine flow paths 30A by the flow path partition wall 34, and the vapor trap 30 is configured. For example, the vapor discharge line connected to the vapor outlet 18B may be divided into a large number of fine flow paths (flow paths that are short in the flow direction) by a mesh-shaped flow path partition.

  Further, in each of the above-described embodiments, the example in which the fine channel 30A includes the plate-like (lattice-like) channel partition wall 34 so that the rectangular channel is formed is shown, but the present invention is not limited to this. For example, the steam trap 30 may be formed in a honeycomb shape, and may be configured such that the outer peripheral surfaces of a large number of cylindrical pipes are connected. In these cases, it is preferable to determine the representative diameter of the fine channel so that the droplet d flying in the vapor channel 36 does not pass through the fine channel.

  Further, in each of the above-described embodiments, the steam generators 12 and 54 have been illustrated with the buffer gas flow path 26 and the superheater 52 sandwiched between the steam generators 18 and 20, respectively. It is needless to say that the present invention is not limited to this and can be applied to any steam generator in which droplets may be generated.

It is a mimetic diagram showing a schematic whole composition of a steam generator concerning a 1st embodiment of the present invention. It is a perspective view which shows typically the droplet trap which comprises the steam generator which concerns on the 1st Embodiment of this invention. It is a plane sectional view of the droplet trap which constitutes the steam generating device concerning a 1st embodiment of the present invention. It is a plane sectional view expanding and showing some droplet traps which constitute the steam generating device concerning a 1st embodiment of the present invention. It is a perspective view showing typically the steam generator which constitutes the steam generator concerning a 1st embodiment of the present invention. It is a diagram for explaining a Leidenfrost phenomenon. It is a schematic diagram which shows the schematic whole structure of the steam generator which concerns on the 2nd Embodiment of this invention. It is a perspective view which shows typically the steam generator which comprises the steam generator which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

10 Steam generator 12 Steam generator (steam generator)
18 Steam generating part 30 Droplet trap (channel partition)
34 Bulkhead (channel partition)
38 Temperature Control Unit 50 Steam Generator 54 Steam Generator (Steam Generation Unit)

Claims (6)

A steam generator for vaporizing the liquid;
A flow path partitioning body that divides a steam flow path downstream of the steam generation section into a plurality of flow paths;
A temperature control means for maintaining the surface temperature of the flow path partition body at or above a lower limit temperature at which the liquid droplets cause a Leidenfrost phenomenon;
Steam generator with   2. The flow path partition body is disposed so that a representative diameter of the flow path partitioned by the flow path partition body is equal to or smaller than a diameter of the droplet flying upstream from the flow path partition body. The steam generator described. The vapor generating unit is configured to vaporize the liquid supplied to the flow path by heating the peripheral wall of the flow path having a fine representative diameter.
The said flow path division body is arrange | positioned so that the representative diameter of the said flow path which this flow path division body divided may be below the representative diameter of the flow path in the said steam generation part. Steam generator.   The steam generator according to any one of claims 1 to 3, wherein the flow path defined by the flow path partitioning body is disposed so that steam flows from above in the direction of gravity. The steam generation part is adapted to vaporize the supplied water,
The steam generator according to any one of claims 1 to 4, wherein the temperature control means is configured to keep a surface temperature of the flow path partition body at 160 ° C or higher. The steam generator according to any one of claims 1 to 5, wherein the temperature control means is configured to keep the surface temperature of the flow path partition body at or below the Leidenfrost temperature.

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