JP2002349802A - Heat storage type steam generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat storage type steam generator which is quickly started, and in which a thermal shock is low upon recovery of heat, an unbalance between high temperature and low temperature is decreased and a heat storage member can be formed with a marketed standard material by a minimum welding operation. SOLUTION: In the heat storage type steam generator, electric energy is stored as heat energy and the stored heat is supplied to water to generate steam. A steel material having a square form in a section (square steel), a rectangular form (a kind of square steel) or a circular form (round bar) or the like is used as the heat storage member. A central hole is provided in the heat storage member and a central rod is inserted thereto. An annular passage formed by the inner surface of the central hole and the outer surface of the center rod is used as a surface for boiling and evaporating injected water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores heat generated by, for example, inexpensive nighttime electric power in a heat storage body, injects water as needed into a cavity provided in the heat storage body, and boils and evaporates the inside of the cavity. The present invention relates to a regenerative steam generator that generates steam by using a metal such as iron as a regenerator. The generated steam can be supplied as it is to use as a steam supply device (boiler), and the generated steam can be used as a hot water supply device that easily generates hot water using a gas-liquid direct contact heat exchanger. It is.

[0003]

2. Description of the Related Art Conventionally, heat generated by, for example, inexpensive nighttime electric power is stored in a metal heat storage body (a heat capacity per unit volume is large due to a small specific non-volume and a high heat storage temperature), and a cavity in the heat storage body is used. Of a regenerative steam generator for generating steam by pouring water into the water and evaporating it by boiling has already been disclosed in Japanese Patent Application No. 1-0443535 and Japanese Patent Application Laid-Open No. 22-22 / 1990.
No. 5951 has been filed.

The former (Japanese Patent Application No. 1-0443535) includes:
Water is supplied to an evaporating chamber formed in the heat storage body and having a cavity with an opening at the top, and the water is boiled and evaporated by exchanging heat with the inner surface of the heat storage body cavity. Is described. However, the proposal remains only in principle,
Changes in the state of heat dissipation (heat recovery), including the behavior of the water and the generated steam poured into the cavity inside the heat storage body and the heat conduction of the heat storage body (change of the temperature distribution of the heat storage body), Further, there is almost no mention of a desirable specific form such as a contact area of the heat storage portion with water per unit heat capacity.

[0005] The latter (Japanese Patent Laid-Open No. 225951/1990) discloses that a heat storage portion has two flat bars (width of about 150 mm and thickness of 4 mm).
The width is designed so that the temperature difference in the width direction during heat storage, that is, the temperature difference between the heater side and the opposite side is about 10 ° C. The thickness is designed so that the stored thermal energy can be recovered in 1 to 2 hours. )
Is overlapped with a small gap (1 to 3 mm) and the periphery is sealed by welding to form a cavity. A water injection pipe is connected to the top, and the water from the water injection pipe boils and evaporates in the small gap to form steam. It is described that a configuration that is recovered from a steam pipe connected to a lower portion is referred to as a heat storage block, and a plurality of the heat storage blocks are arranged to have a required heat storage capacity.

[0006] The heat storage portion is a flat steel welded structure, is inexpensive and easily manufacturable, and has a high thermal conductivity characteristic of the steel material. Although it is excellent in that it is configured not to cause fatigue, it has the following problems.

(1) If the heat recovery capacity (capability of recovering heat stored in a short time) is increased, for example, if heat stored in eight hours at night is to be recovered in half an hour, the flat steel inner and outer surfaces must be recovered. The temperature difference becomes about 100 ° C., and a thermal shock occurs. Particularly, the distortion (thermal shock) of the welded portion on both sides of the flat steel is large, and the results of simulation analysis by a computer have revealed that there is a possibility that the welding may be broken after several hundred cycles of operation. If the thickness of the flat steel is reduced, the temperature difference between the inner and outer surfaces becomes smaller and the problem of thermal shock can be solved.However, the number of blocks must be increased to secure the necessary heat storage amount, which increases cost. Become. (The heat storage capacity is simply proportional to the heat storage body weight.)

(2) The heat transmission coefficient in the water injection section at the top of the heat storage block is higher than in other sections. (At the top of the regenerator, water with a low temperature flows only at the center of the micro gap at the top, and the boiling heat transfer characteristic has the highest heat transmission characteristic at the point of the saturation temperature of steam plus several tens of degrees Celsius. For this reason, when water injection is started, first, heat exchange occurs mainly at the top of the heat storage body, and the temperature rapidly drops to near the saturation temperature of steam. This phenomenon has a characteristic that it sequentially moves downward. As a result, in the middle stage of heat recovery, a large temperature difference occurs between the upper and lower portions of the heat storage body. If heat storage is restarted in this state, only the lower temperature reaches the rated temperature first, and sufficient heat storage cannot be performed. However, this is not a problem when the heat recovery from the heat storage body is completely completed. A method of eliminating the upper and lower temperature differences by heat conduction between the upper and lower heat storage bodies is also conceivable, but if the height of the heat storage block exceeds 1 m, the time required for the temperature difference to fall within an appropriate temperature difference is required for one day or more.
Can not be adopted.

(3) In order to prevent water from leaking into the heat storage body even when there is a leak (water injection valve, etc.), the water surface of the steam-water separator, hot water tank, etc. should be placed below the heat storage body except for heat recovery for safety of the device. It is located below, and the water in the injection pipe at the time of heat recovery pause is a steam-water separator,
Or consider returning to the hot water tank. For this reason, the time of filling the water in the vertically long water injection pipe when heat recovery is restarted becomes longer,
There will be a time lag in the steam pressure control or hot water supply temperature control.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a heat storage body which has solved the conventional disadvantages as follows.

[0011] A structure of a heat storage element which is tough and has high performance (can perform heat recovery in a short time) by reducing thermal shock generated in the heat storage element during heat recovery.

[0012] A heat recovery method in which the upper and lower temperature imbalances in the heat storage body during heat recovery are as small as possible.

[0013] A heat storage element in which a heat storage element is used as much as possible on a commercially available standard material, and welding work that leads to improvement in reliability and cost reduction is reduced.

Improvement of control responsiveness by shortening water filling time when resuming heat recovery

[0015]

According to a first aspect of the present invention, a heat storage body is made of a steel material whose cross section is substantially symmetrical with respect to the center of a square (square steel), a rectangle (a type of square steel), or a circle (steel bar). A central hole is provided in this, the inner surface is used as a main boiling evaporation surface for water injection, and a center rod is inserted to form an annular flow path for water injection and generated steam.

[0016] Water is injected from the injection pipe to the top of the center rod.
The water overflows and flows down the annular flow path toward the lower part of the heat storage body. During this time, the injected water boils and evaporates, is converted into steam, and is discharged through a steam pipe. In the early stage of heat recovery, the water injected into the top of the central rod instantly boils partially and becomes a gas-liquid multiphase flow and flows down the annular flow path. If this state is maintained, excessive heat exchange in the water injection section at the top of the heat storage body is mitigated, as in the case of a conventional heat storage body in which flat steel sheets are stacked, and heat exchange only from the upper part of the heat storage body is avoided. In order to promote this phenomenon, it is conceivable that a gas-liquid multiphase flow overflows from the top of the center rod for as long as possible by providing a depression or a shallow hole at the top of the center rod.

According to a second aspect of the present invention, the effect of the shape of the top of the center rod of the invention according to the first aspect is promoted, and a recess or a shallow hole provided at the top of the center rod is further deepened.
By extending to the lower end of the center rod, water injection is surely converted into a gas-liquid mixed phase flow while reciprocating in the center rod, and it is intended to overflow from the top of the center rod and flow down the annular flow path.
In order to realize the present invention, the center rod adopts a center pipe with a closed lower end, and a water injection pipe is inserted into this.

According to a third aspect of the present invention, there is provided an intermediate structure between the first and second aspects of the present invention. First, a water injection pipe path is a path leading to a heat storage body through a steam pipe, and then a center rod is provided. In this case, a method is adopted in which the hole reaches the top of the central rod through the hole provided, and overflows from the top of the central rod to flow down the annular flow path formed by the central hole and the central rod. As a result, the center rod becomes a center pipe. By the above, the heat storage body center hole does not need to penetrate the heat storage body top.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In addition to the configuration of the invention described in (1), a wire (steel wire or the like) or a thin flat steel (steel ribbon) is wound around a part or the whole of the center rod to form the center hole and the center rod (or center pipe). By forming an annular flow path in a spiral shape, the water-injection and vapor-liquid multi-phase flow of steam are swirled and flow down, giving centrifugal force to the water droplet and impinging or pressing against the inner surface of the center hole, the heat transfer performance is improved. In addition, the heat transfer area of the inner surface of the center hole can be adjusted with a high degree of freedom.

According to a fifth aspect of the present invention, in addition to the configurations of the second and third aspects of the present invention, a water injection pipe is connected by connecting pipes having substantially the same inner diameter and outer diameter, and by inserting them into each other, The inner diameter of the heat storage body is gradually increased by the insertion depth of the center pipe. The part of the injected water boils and evaporates in the injection pipe to form a gas-liquid multi-phase flow, and the remarkable pressure loss in the injection pipe increases. This is a configuration that prevents such a situation.

According to the first aspect of the present invention, the ratio of the heat transfer area of the heat storage body (the inner surface area of the center hole with respect to the weight of the heat storage body) is about one-fourth as compared with the flat steel overlap, and the temperature decreases from the upper part of the heat storage body. However, the tendency to sequentially shift to the lower part is greatly reduced. Furthermore, the arrangement of the center holes in the heat storage body is substantially symmetrical, so that the thermal shock is concentrated on the welded portion unlike the flat steel lamination method, and does not become a weak point. In addition, the strain due to the temperature difference between the inner surface of the center hole and the outer surface of the heat storage body is largest at the inner surface of the center hole. Cracks and cracks are prevented from progressing and are inherently safe.

At the time of heat recovery, water first flows into the recess at the top of the central rod from the water injection pipe. At the initial stage of heat recovery, the central rod is also hot, and a very small part of the injected water instantaneously boils and evaporates to form a jet (steam and fine water droplets). The gas overflows from the top of the central rod as a gas-liquid mixed tank phase flow), and then flows down the annular flow path between the central hole and the central rod. As a result, the temperature drop at the top of the center rod becomes faster, but the heat exchange with the inner surface of the heat storage center hole is a gas-liquid multi-phase flow of steam and fine water droplets, and the heat exchange area is reduced. Is uniform, the initial heat transfer amount at the upper part of the heat storage body is greatly reduced, and the phenomenon of the temperature drop from the upper part of the heat storage body is greatly improved. This effect is further enhanced if the heat transfer coefficient is reduced by disposing a metal thin plate (metal foil) on the inner surface of the central hole of the heat storage body to provide a function of a thermal shield.

According to a second aspect of the present invention, the effect of the depression or hole at the top of the center rod according to the first aspect of the present invention is pushed forward. This is a configuration in which a jet of gas-liquid multiphase flow flows out from the top of the center rod for a long time. According to the invention of claim 1, only the upper part of the center rod serves to make water injection a gas-liquid multi-phase flow. In this method, however, the center pipe from the top to the bottom serves to make water injection a gas-liquid multi-phase flow. Become. The center rod is a pipe for inserting a water injection pipe, and is referred to as a center pipe. The center pipe adopts a configuration that blocks the lower part. Furthermore, the central rod (the central pipe) receives heat from the heat storage body by heat exchange through radiation and heat conduction from the central hole, and it takes a longer time to lower the temperature, so a long-term gas-liquid multiphase flow supply Becomes possible.

The third aspect of the present invention is similar to the configuration of the first aspect of the present invention. First, the injection pipe path is a path leading to the heat storage body through the steam pipe, and then through the hole provided in the center rod, to the top of the center rod, overflowing from the top of the center rod, and an annular flow path formed by the center hole and the center rod Is adopted. As a result, the center rod becomes a center pipe. In this method, the reciprocating method of claim 2 is a one-way method.
The entire central pipe will continue to function as a water-gas multi-phase flow.

With the above, it is not necessary for the heat storage body central hole to penetrate the heat storage body top.

Regarding the time lag at the time of filling the water injection pipe with water, which was a drawback of the prior art and the first and second aspects of the invention, the water injection pipe is inserted from the lower part of the heat storage body, so the water lag from the water surface of the steam-water separator. The distance is shortened (the steam partial volume during heat recovery standby can be drastically reduced), and the filling time for water injection into the water injection pipe when heat recovery is resumed is shortened, and steam pressure control or hot water supply temperature control without time lag is executed. You can do it.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In addition to the configuration of the invention described in the above, a part or all of the annular flow path between the heat storage center hole and the center rod or between the center pipes is formed in a spiral shape, and the gas-liquid multiphase flow of water injection and steam swirls and flows down. As a result, a centrifugal force is applied to the water droplet, and the water droplet collides or is pressed against the inner surface of the center hole to improve the heat transfer performance. If a wire (steel wire or the like) or a thin flat steel (steel ribbon) is wound around the center rod so that the finished outer shape is slightly smaller than the center hole diameter, this method can be adopted simply and at low cost. The turning speed can be freely set by changing the pitch and the number of wires or thin steel bars wound around the center rod. For example, it can be set so that the top of the heat storage body has a low turning speed and the bottom has a high turning speed. Furthermore, in the case of thin flat steel, the heat transfer area on the inner surface of the center hole can be adjusted with a high degree of freedom.

According to a fifth aspect of the present invention, in addition to the second and third aspects of the present invention, the inner diameter of the water injection pipe is increased stepwise according to the insertion depth of the center rod, so that the water injection becomes a gas-liquid multiphase flow and the pressure loss is increased. This is realized by inserting water injection pipes having the same inner and outer diameters to each other to connect them.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system diagram.

In this drawing, two heat storage bodies 1 are arranged so as to sandwich a heater 8 for heating, and are housed in a heat insulating tank 6 filled with a heat insulating material 7. The heat storage body 1 is supported and fixed from the bottom of the heat insulating tank 6 by a leg made of a heat-resistant alloy, but the leg is omitted in this figure. The heat storage body 1 has a central hole 2 made of a bar-shaped steel having a square cross section, a rectangular cross section, or a circular cross section. A water injection pipe 4 is provided at an upper part, and a steam pipe 5 is provided at a lower part of the heat storage body 1 through thermal shock preventing switching parts 4A and 4B. Connected
Constructs a closed structure. The center rod 3 is inserted into the center hole 2 to form an annular flow path 9. In this drawing, the combination of the two heat storage elements 1 and the heater 8 is used, but the number is changed according to the heat storage capacity of the apparatus, and the number of sets is not limited.

The size of the heat storage body is determined by, for example, nighttime power.
When planning to store heat from zero to 100% in 8 hours, the temperature difference between the heater side and the opposite side of the heat storage body will be around 10 ° C, and the heat recovery capacity for 1 hour (heat storage in 8 hours) Since the thermal shock generated on the inner surface of the center hole falls within the planned life due to the fact that the heat can be recovered in one hour), a 150 mm square steel with a center hole of about 30 mm can be used. It is determined by the time and heat recovery capacity, and the height of the heat storage body is 500
mm to 2000 mm is appropriate and the optimal value is determined by an effective adiabatic plan; the above dimensions are one example.

The steam pipe 5 is connected to the steam separator 30 so that steam is blown out into the water from a number of small holes 31 at the tip. If the steam ejected into the water is superheated steam, the temperature is reduced to the steam saturation temperature by direct contact heat exchange. The steam on the water surface 32 of the steam separator 30 is supplied to a steam destination via a steam pipe 34 and a steam valve 35. The steam pipe is provided with a safety valve 36. The water level in the steam-water separator 30 is determined to be maintained at a predetermined water level by the water level electrode 33, and the opening and closing of the water supply valve 45 is controlled to maintain a constant water level. The feedwater source can be used as it is when tap water with a pressure sufficiently higher than the generated steam pressure can be used, but if necessary, a feedwater pump may be installed. (Not shown)

The water source for the water injection is the water in the steam separator 30. During normal operation, the water in the steam separator 30 is saturated water, and if the pressure is increased by the water injection pump 44, the NPSH becomes insufficient and the pump 44 functions. Therefore, the cooling is performed by the sub cooler 40. As a cooling heat source of the subcooler 40, a method of executing the cooling water source by supplying water to the steam separator 30 is adopted.

The water injection is pressurized by the water injection pump 44, controlled by opening and closing the water injection valve 47, and flows into the heat storage body via the water injection pipe and the thermal shock preventing switching 4A.

The second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a system diagram.

The invention shown in FIG. 3 is obtained by pushing the effect of the depression or hole at the top of the center rod of the first embodiment. The gas-liquid multi-phase jet is discharged from the top of the rod. The water injection pipe 4 has a configuration in which the inner diameter is gradually increased according to the insertion depth of the center rod 3 so as to suppress the water injection from becoming a gas-liquid multiphase flow and increasing the pressure loss. The center rod is a pipe for inserting a water injection pipe, and is referred to as a center pipe 3. The central pipe 3 adopts a configuration that closes the lower part. Other configurations are the same as those of the first embodiment.

The third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a system diagram of the third embodiment.

The invention shown in this figure is different from the first embodiment and the second embodiment.
In the first embodiment, the water injection pipe route is a route leading to the heat storage unit 1 through the steam pipe, and then the center rod 3 is passed through the hole provided in the center rod 3. A method is adopted in which an annular flow path 9 formed by the center hole 2 and the center rod 3 flows down to the top and overflows from the top of the center rod 3. As a result, the center rod becomes a center pipe. Further, the hole into which the water flows upward has a configuration in which the inner diameter increases stepwise according to the insertion depth, similarly to the configuration of the third aspect. With the above, it is not necessary for the heat storage body center hole to penetrate the heat storage body 1 top.
(That is, there is no need to connect the water injection pipe 4 to the heat storage body via the thermal shock prevention switching 4A.)

The fourth embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a perspective view of the fourth embodiment.

According to the present invention, in addition to the structure of the invention described in the first to third embodiments, a heat storage body central hole 2 is provided.
By making the annular flow path 9 between the shaft and the center rod 3 into a spiral shape, water and steam are swirled and flow down to apply a centrifugal force to the water droplets, and to impinge or press against the inner surface of the center hole 2 to improve heat transfer performance. It has a configuration. Center rod 2
If a wire (steel wire or the like) 10 or a thin flat steel (steel ribbon) 10 is wound around the inside and the finished outer shape is slightly smaller than the inner diameter of the center hole 2, this method can be adopted simply and at low cost. The turning speed can be set freely by changing the pitch and the number of the wire 10 or the thin flat steel 10 wound around the center rod 3. For example, it can be set so that the top of the heat storage body has a low turning speed and the bottom has a high turning speed. Further, in the case of the thin flat steel 10, the heat transfer area on the inner surface of the center hole 3 can be adjusted with a high degree of freedom.

Referring to the drawings, a fifth embodiment of the present invention will be described. FIG.

The present invention relates to a method for connecting a water injection pipe 4 inserted into a steam pipe 5 and a center pipe 3 in addition to the configuration of the invention described in the second and third embodiments. It is. In the center pipe 3, the inner diameter of the water injection pipe 4 is gradually increased according to the insertion depth so that the pressure loss in the water injection pipe 4 is not excessively increased, and the water injection pipe 4 is inserted when assembling the heat storage body. Since it is necessary to weld the thermal shock preventing switching 5A and the steam pipe 5 to the heat storage body 1 as it is, simple connection work of the water injection pipe 4 is required. As a countermeasure, as shown in FIG. 5, the connection is made only by inserting the water injection pipe 4 having an outer diameter equal to the inner diameter into the water injection pipe 4. Normally, the pipe connection is generally free from leakage, but the heat storage body 1 and the steam pipe 5 of the present invention are connected.
As for the water injection pipe 4 inside, the leaked water returns to the steam separator 30 via the steam pipe 5 as it is, and the water injection leak does not cause a problem in the heat recovery operation.

As an example, FIG. 5 shows a configuration in which the inner diameter of the water injection pipe 4 is sequentially increased from left to right to 3φ, 4φ, 5φ, and 6φ, and all of them can be accommodated in a tube having an outer diameter of 10φ.

[0044]

According to the first aspect of the present invention, it is possible to use a square steel or a round steel as a commercially available standard material and to obtain a highly reliable heat storage body with a small welding amount. In addition, thermal shock during heat recovery is greatly reduced by using the central hole as a heat transfer surface, and the amount of initial heat recovery at the top of the heat storage body is reduced by adjusting the heat transfer area (reducing the diameter of the center hole). Thus, the temperature imbalance between the upper and lower portions of the heat storage body can be reduced.

According to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, water injection is converted into a gas-liquid multiphase flow until the end of heat recovery by reciprocating in the center rod (center pipe). This suppresses the state where water flows directly into the annular flow path between the center hole and the center rod, reduces the phenomenon that the temperature drops quickly from the initial stage of heat recovery at the top of the heat storage body, and further reduces the temperature imbalance between the top and bottom of the heat storage body. Can be obtained.

According to the third aspect of the present invention, it is possible to obtain an effect of further reducing the temperature imbalance between the upper and lower portions of the heat storage body, similarly to the effect of the second aspect of the invention. In addition, since the water injection pipe passes through the steam pipe to reach the heat storage body, the work of piping the water injection pipe becomes easier. (It is not necessary to use the heating pipe 4A for preventing thermal shock for the water injection pipe.) The water injection pipe 4 is shortened, and the time required to fill the water injection pipe with water when resuming heat recovery is shortened, thereby eliminating the time lag and improving controllability. . The necessity of penetrating the center hole of the heat storage body is eliminated.

According to the fourth aspect of the present invention, since the annular flow path 9 between the center hole 2 and the center rod (center pipe) 3 is formed as a spiral, the water droplets in the gas-liquid mixed-phase flow have an effect on the inner surface of the center hole due to centrifugal force. Effective heat exchange can be realized because of the collision. Wire (steel wire, etc.) 10 or thin flat steel (steel ribbon) 10 on the center rod
If the finished outer shape is slightly smaller than the center hole diameter, this method can be adopted simply and at low cost. The turning speed can be set freely by changing the pitch and the number of the wire 10 or the thin flat steel 10 wound around the center rod 3. For example, it can be set so that the top of the heat storage body has a low turning speed and the bottom has a high turning speed. Further, in the case of the thin flat steel 10, the heat transfer area on the inner surface of the center hole can be adjusted with a high degree of freedom.

According to the fifth aspect of the present invention, the inner diameter of the water injection pipe in the center pipe 3 can be increased stepwise by the insertion depth, and the work of connecting the steam pipe 5 to the heat storage body 1 can be largely performed. Can be simplified. Leakage at the insertion part of the water injection pipe 4 causes the water injection to return to the steam separator 30 via the steam pipe 5 without any problem.

[0049]

[Brief description of the drawings]

FIG. 1 is a system diagram showing a first embodiment of the present invention.

FIG. 2 is a system diagram showing a second embodiment of the present invention.

FIG. 3 is a system diagram showing a third embodiment of the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the present invention.

FIG. 5 is a sectional view of an injection pipe showing a fifth embodiment of the present invention.

FIG. 6 is a cross-sectional view of a conventional heat storage body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Heat storage body 2 Center hole 3 Center rod (center pipe) 4 Water injection pipe 4A Water injection pipe fitting (for thermal shock prevention) 5 Steam pipe 5A Steam pipe fitting (for thermal shock prevention) 6 Thermal insulation tank 7 Thermal insulation material 8 Heater 9 Annular flow path 10 wire or flat steel 30 Steam-water separator 31 Small hole 32 Water surface 33 Water level electrode 34 Steam pipe 35 Steam valve 36 Safety valve 40 Subcooler 41 Communication pipe 44 Water injection pump 45 Water supply pipe 46 Water supply valve 47 Water injection valve

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Takahiko Oishi 24-1 Yonedachojima, Takasago City, Hyogo Prefecture F-term (reference) in Nippon Kikai Co., Ltd. 3L034 BA12 BB02

Claims (5)

[Claims] 1. A regenerative steam generator for storing electric energy as heat energy and applying the stored heat to water to generate steam, the cross section of which is square (square steel) or rectangular (a type of square steel). ) Or a steel material such as a circle (steel bar) is used as a heat storage body, and a center hole is provided in this heat storage body.
A regenerative steam generator wherein a center rod is further inserted to make an annular flow path formed by the inner surface of the center hole and the outer surface of the center rod a boiling evaporation surface for water injection. 2. In addition to the configuration of the invention described in claim 1,
The central rod is called the central pipe as a pipe with a closed bottom, and the water injection pipe is inserted into the central pipe to reciprocate water up and down the regenerator, and when the injected water overflows from the top of the central rod, it becomes a gas-liquid mixed phase flow A regenerative steam generator, characterized in that: 3. In addition to the configuration of the invention described in claim 1,
The path leading to the heat storage element of the water injection pipe passes through the inside of the steam pipe connected to the lower part of the heat storage element, then to the top of the center rod through the hole provided in the center rod, and the gas-liquid mixed-phase flow of water injection and steam from the top of the center rod Alternatively, a regenerative steam generator characterized by overflowing water and flowing down an annular flow path formed by a center hole and a center rod. 4. An annular flow path formed by a center hole and a center rod (or a center pipe) is formed by winding a wire (steel wire or the like) or a thin flat steel (steel ribbon) around part or all of the center rod. The regenerative steam generator according to claim 1, wherein the steam generator is formed in a shape. 5. A water injection pipe structure is characterized in that pipes having substantially the same inner diameter and outer diameter are connected to each other by inserting them into a pipe, and the inner diameter is gradually increased according to the insertion depth of the central pipe in the heat storage body. Claim 2, or 3
A regenerative steam generator according to any one of the above. [0001]