JP5851195B2 - Steam generator - Google Patents

Description

  The present invention relates to a steam generator that generates saturated steam by heating water contained in a container by heat generated by combustion of a burner.

  As a conventional steam generator, for example, in Patent Document 1, a cylindrical storage portion in which water and an electric heater are stored is installed so that its tube axis is horizontal, and a cylindrical shape that generates saturated steam. The can body is connected in communication with the upper end of the outer peripheral surface of the housing portion so that the tube axis of the can body is perpendicular to the tube axis of the housing portion. A steam generator having an L-shaped container is disclosed.

  The electric heater accommodated in the accommodating portion is a longitudinal electric heater provided in a state along the tube axis of the tubular accommodating portion, and the accommodating portion provided with the electric heater is water that generates saturated steam. When the water is filled up to the position below the inside of the can connected in communication with the upper end of the housing, and the water is heated by the electric heater, the can Saturated steam is generated from the water surface inside.

  Thus, by connecting the storage unit and the can body to form a substantially L-shaped container, for example, the storage unit is installed so that its tube axis is vertical, and the storage unit and the can body It is said that the length in the height direction of the container can be shortened as compared with the case where the container is constituted by the containers connected vertically.

JP 2004-53146 A

However, since the steam generator disclosed in Patent Document 1 is configured with a substantially L-shaped container as described above, the height of the container can be reduced, but the length in the horizontal direction is long. Therefore, there exists a problem that a steam generator cannot be comprised compactly.
In addition, in order to generate a sufficient amount of saturated steam from the water surface inside the can body, it is necessary to heat the whole amount of water contained in the container with an electric heater to raise the temperature. Since it takes time to raise the temperature of the water, there is a problem that a long time is required until a sufficient amount of saturated steam is generated.

  This invention is made | formed in view of this situation, The objective is to provide the steam generator which can generate | occur | produce saturated steam rapidly, although it is a compact structure.

In order to achieve the above object, a steam generator according to the present invention comprises:
A steam generator that generates saturated steam by heating water contained in a container by heat generated by combustion of a burner.
The container includes a furnace tube through which combustion gas generated by combustion of the burner flows, and a porous body provided on the outer peripheral side of the furnace tube in a state of being thermally connected to the furnace tube, The porous body has water permeability and is disposed in a state extending from below the surface of the water contained in the container to above the water surface, so that the water that has permeated the porous body is transmitted from the furnace tube. Heated to generate saturated steam ,
The furnace tube has a double pipe structure in which an inner tube extending along the axial direction of the furnace tube is provided inside the furnace tube, and a combustion gas formed between the furnace tube and the inner tube Flowing the combustion gas in a flow path, introducing the saturated steam generated by heat exchange between the combustion gas and water contained in the vessel through the furnace tube and the porous body into the inner pipe. The superheated steam is generated by heat exchange through the inner pipe between the saturated steam and the combustion gas introduced into the inner pipe, and the superheated steam is discharged from the inner pipe to the outside. .

According to the above characteristic configuration, since the furnace tube in which the combustion gas generated by the combustion of the burner circulates and the porous body provided on the outer peripheral side of the furnace tube in a state of being thermally connected to the furnace tube, The heat of the combustion gas generated by the combustion of the burner can be transferred to the porous body thermally connected to the furnace tube through the furnace tube.
In addition, the porous body has water permeability and is disposed in a state extending from below the surface of the water contained in the container to above the surface of the water, so that the water contained in the container is porous. It is possible to penetrate inside the many pores formed in the body and has a large specific surface area due to the many pores,
With this large specific surface area, the water contained in the container can be efficiently heated by the portion of the porous body located below the water surface, and the water permeated from the portion of the porous body located below the water surface can be efficiently Saturated vapor can be rapidly generated from the porous body by heating well.
Further, according to the above characteristic configuration, the furnace tube has a double tube structure in which the inner tube is provided inside the furnace tube, and the saturated steam generated in the container is introduced and circulated into the inner tube, Combustion gas can be flowed in the combustion gas flow path formed by the inner peripheral surface of the furnace tube and the outer peripheral surface of the inner tube. Thus, heat exchange between the combustion gas and water can be performed through the furnace tube and the porous body provided on the outer peripheral side of the furnace tube, and water can be heated to generate saturated steam. Heat exchange between the combustion gas and the saturated steam can be performed via the pipe, and the saturated steam can be heated to generate superheated steam. By making the furnace tube into a double tube structure in this way, saturated steam and superheated steam can be generated simultaneously by the heat generated in the furnace tube, making it possible to design the apparatus more compactly and quickly. Saturated steam and superheated steam can be generated.

Further features of the steam generator according to the present invention are as follows:
The burner is provided on the base end side in the axial direction of the furnace tube, and the burner has a combustion chamber formed in a cylindrical shape, and is directed toward the tangential direction of the inner peripheral surface of the combustion chamber. It is a tubular flame burner that forms a tubular flame by ejecting an air-fuel mixture with fuel gas or ejecting air and fuel gas separately.

  According to the above characteristic configuration, since the burner is a tubular flame burner that forms a tubular flame, high-temperature combustion that is generated by combustion by the tubular flame formed in the combustion chamber formed in a cylindrical shape and is in a swirling state The gas enters the furnace tube without being prevented from turning, and flows in the axial direction while turning in the circumferential direction. Therefore, heat exchange between the combustion gas and the furnace tube can be performed with a coefficient larger than a general counter flow or parallel flow heat transfer coefficient, and the porous body thermally connected to the furnace tube can efficiently perform the heat exchange. Water can be heated to generate saturated steam.

Further features of the steam generator according to the present invention are as follows:
The burner is provided on the base end side in the axial direction of the furnace tube, and the burner has a combustion chamber formed in a cylindrical shape, and is directed toward the tangential direction of the inner peripheral surface of the combustion chamber. It is a tubular flame burner that forms a tubular flame by ejecting an air-fuel mixture with fuel gas or ejecting air and fuel gas separately,
In flowing the combustion gas distally from the axial direction of the base end side in the combustion gas flow path formed between the front Symbol furnace tube within said tube,
The inner pipe is provided on the base end side in the axial direction so as to pass through the combustion chamber of the tubular flame burner and penetrate the combustion chamber to the base end side in the axial direction.

  According to the above characteristic configuration, the inner pipe is provided on the proximal end side in the axial direction so as to pass through the combustion chamber of the tubular flame burner and penetrate the combustion chamber to the proximal end side in the axial direction. The saturated steam flowing in the pipe can exchange heat with the hottest combustion gas when passing through the combustion chamber. Therefore, saturated steam can be generated quickly and the apparatus can be designed more compactly.

Further features of the steam generator according to the present invention are as follows:
The porous body is integrally formed on the outer peripheral surface of the furnace tube, and the furnace tube is configured to be rotatable with the axial direction of the furnace tube as a rotation axis, and the axial direction of the furnace tube is set as a horizontal direction. It is in the point provided with the rotation drive means which is installed in the said container and rotates the said furnace tube.

According to the above characteristic configuration, since the porous body is integrally formed on the outer peripheral surface of the furnace tube, the heat generated by the combustion of the burner can be efficiently transferred from the furnace tube to the porous body. The water in the container can be heated to a higher temperature by the material, and the water that has permeated the porous material can be heated more quickly to generate saturated vapor.
The furnace tube is installed in the container with the axial direction as the horizontal direction, and the rotation driving means for rotating the furnace tube rotates with the axial direction as the rotation axis. Since the porous body formed integrally with the rotating body rotates and heat transfer from the porous body to the water stored in the container is promoted, the water stored in the container is heated to a higher temperature. Can do. Further, since the rotation of the porous body allows more water to permeate into the porous body, saturated vapor can be generated more rapidly.

Further features of the steam generator according to the present invention are as follows:
The porous body is formed of a sintered body of massive metal, massive ceramics, or a mixture thereof.

  According to the above characteristic configuration, the porous body is formed of a sintered body of a lump (for example, spherical) metal, a lump ceramic, or a mixture thereof, so that the specific surface area inside the porous body is increased. It is possible to efficiently exchange heat with water that has penetrated into the porous body. As a result, saturated steam can be generated quickly, and the apparatus can be configured more compactly.

Further features of the steam generator according to the present invention are as follows:
The furnace tube is formed as an airtight body having no gas permeability by the same material as that forming the porous body.

  According to the above characteristic configuration, since the furnace tube is made of the same material as the material forming the porous body, it is easy to integrally form the furnace tube and the porous body. For example, in the case where the furnace tube and the porous body are integrally formed by sintering or the like, since the same material is used, the sintering becomes easy and the bonding by the sintering is strengthened so that the heat transfer is efficiently performed in the sintered portion. It is. In addition, since the same material is used after sintering, the coefficient of thermal expansion is the same, the thermal stress generated between the furnace tube and the porous body can be minimized, and the durability of the device can be reduced. Can be improved. Further, since the furnace tube is formed as an airtight body having no gas permeability, it is possible to prevent the combustion gas flowing inside the furnace tube from flowing out into the container, and the inside of the furnace tube of water contained in the container Inflow to the can be prevented.

The cross-sectional view of the steam generator which concerns on this embodiment. The longitudinal cross-sectional view of a steam generator. The cross-sectional enlarged view of a porous body. The longitudinal cross-sectional view of a tubular flame burner.

  An embodiment of a steam generator according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a cross-sectional view of the steam generator 1 according to the present embodiment, and FIG. 2 is a vertical cross-sectional view of the steam generator 1 according to the present embodiment. The steam generator 1 generates saturated steam V by heating the water W stored in the container 2 with heat generated by the combustion of the tubular flame burner 20. The vessel 2 is provided with a furnace tube 3 through which combustion gas E generated by the combustion of the tubular flame burner 20 flows, and a porous provided on the outer peripheral side of the furnace tube 3 in a state of being thermally connected to the furnace tube 3. A body 9 is provided. The porous body 9 has water W permeability and is disposed in a state extending from below the water surface of the water W accommodated in the container 2 to above the water surface. The saturated steam V is generated by heating by heat transfer from the furnace tube 3.

  The tubular flame burner 20 is attached to the outer surface of the container 2 having a hollow rectangular parallelepiped shape. And between the side surface (referred to as the proximal end side surface 2a) of the container 2 to which the tubular flame burner 20 is attached and the side surface of the container 2 (referred to as the distal end side surface 2b) facing the proximal end side surface 2a. The furnace tube 3 is provided so as to cross the inside of the container 2. Specifically, the tubular flame burner 20 is attached to the approximate center of the proximal side surface 2a outside the container 2, and the furnace tube 3 is connected to the tubular flame burner 20 on the proximal side surface 2a. In addition, it is provided so as to cross the inside of the container 2 in a state of extending from the approximate center of the proximal side surface 2a toward the approximate center of the distal side surface 2b.

Further, on the upper surface 2 c of the container 2, a saturated steam outlet 4 for taking out the saturated steam V generated in the container 2, a pressure gauge 5 for measuring the pressure of the container 2, and a water level in the container 2 are measured. A water level gauge 6 is provided.
On the other hand, a water supply port 7 for supplying water W into the container 2 is provided below the proximal side surface 2a. The saturated steam outlet 4 is provided with a steam on-off valve 4a, and the water supply port 7 is provided with a water on-off valve 7a. Further, the container 2 is provided with an overpressure relief valve (not shown) and a mounting portion for a tubular flame burner 20 for generating combustion gas E. Then, the water opening / closing valve 7a of the water supply port 7 is controlled to open and close by a control unit (not shown) so that the water level measured by the water level gauge 6 is maintained at a preset reference water level Ws. Here, as shown in FIG. 2, the reference water level Ws is set to a water level at which about 1/3 of the diameter of the tubular porous body 9 is immersed in water.

Hereinafter, the furnace tube 3 will be described in detail with reference to FIGS. 1 and 2.
The furnace tube 3 is connected to the tubular flame burner 20 with its proximal end 3a supported by the proximal support member Ba provided on the proximal side surface 2a, and its distal end 3b It is supported by a tip-side support member Bb provided substantially at the center of the tip-side side surface 2b, and is provided in a state of passing through the container 2 while traversing the inside of the container 2.
Thereby, the combustion gas E generated in the tubular flame burner 20 is changed from the base end side (right side in FIG. 1) in the axial direction (right and left direction in FIG. 1) of the furnace tube 3 to the tip side in the axial direction (in FIG. 1). It flows to the left side) and is configured to be exhausted from an exhaust port 13 provided on the front end side of the furnace tube 3.

  Further, the furnace tube 3 has a double tube structure in which an inner tube 8 extending along the axial direction of the furnace tube 3 is provided inside the furnace tube 3, and the saturated steam V generated in the container 2 is transferred to the inner tube. 8 is introduced into the inner tube flow path R2 in the inner tube 8 from the distal end side to flow from the distal end side to the proximal end side, and between the inner peripheral surface 3d of the furnace tube 3 and the outer peripheral surface of the inner tube 8. In the formed annular combustion gas flow path R1, the combustion gas E is caused to flow from the proximal end side to the distal end side, and the saturated steam V and the combustion gas E introduced into the inner pipe inner flow path R2 in the inner pipe 8 are brought into the interior. Heat exchange is possible through the tube wall of the tube 8. As a result, the superheated steam S can be generated from the saturated steam V introduced into the flow path R2 in the inner pipe, and the generated superheated steam S is a discharge port 11 provided at the end 8b on the proximal end side of the inner pipe 8. It is comprised so that it may discharge outside.

  The inner space P of the container 2 and the inner pipe inner flow path R2 are connected by the steam introduction flow path Rv on the tip side of the inner pipe inner flow path R2, and the inner space P of the container 2 passes through the steam introduction flow path Rv. The saturated steam V present in the inner pipe can be introduced into the inner pipe flow path R2. In addition, the steam introduction flow path Rv is provided with an introduction opening / closing valve Rva so that the introduction of the saturated steam V to the inner pipe flow path R2 can be blocked.

  Further, the furnace tube 3 and the inner tube 8 are arranged so that their axial centers are concentric, and an annular combustion gas flow path R1 is formed by the inner peripheral surface 3d of the furnace tube 3 and the outer peripheral surface of the inner tube 8. And connected to the combustion chamber 22 of the tubular flame burner 20 at the base end side of the furnace tube 3, the combustion gas E generated by the combustion of the tubular flame burner 20 is introduced, and the exhaust port 13 for the combustion gas E is connected to the combustion chamber 22. It is provided on the tip side of the furnace tube 3.

  The inner peripheral surface 3d of the furnace tube 3 and the inner peripheral surface 22a of the combustion chamber 22 formed in a cylindrical shape of the tubular flame burner 20 are connected substantially flush with each other, and the inner tube 8 has a tubular flame at the proximal end side. While passing through the combustion chamber 22 of the burner 20, a side surface through hole 26 a provided in the combustion chamber side wall 26 orthogonal to the axial direction of the cylindrical combustion chamber 22 is provided to penetrate to the base end side. Therefore, the end 8a on the proximal end side of the inner tube 8 is supported by the side surface through hole 26a, and the distal end side is connected to the steam introduction flow path Rv and fixedly supported.

A discharge port 11 for discharging the superheated steam S generated by heating the saturated steam V is formed in the end 8a on the base end side that penetrates the combustion chamber side wall 26 of the inner pipe 8.
Here, an annular heat-resistant seal member 25 is provided in the side through hole 26a, and the inner tube 8 is slidably supported by the heat-resistant seal member 25. Thereby, the inner tube 8 is heated by the combustion of the combustion gas E and the combustion chamber 22, and thermal expansion generated in the inner tube 8 can be allowed.

  Further, the furnace tube 3 is integrally formed with the porous body 9 on the outer peripheral surface 3c, and the furnace tube 3 is rotatably disposed in the container 2 so that the axial direction of the furnace tube 3 is a horizontal direction and the axial direction is a rotation axis. The furnace tube 3 is configured to be rotated by a motor 10 that is disposed and provided outside the container 2.

Specifically, the furnace tube 3 is supported by the base end side support member Ba provided at the base end side surface 2a at the base end side end portion 3a, and the front end side end portion 3b is provided at the front end side surface 2b. It is supported by a distal end side support member Bb provided substantially at the center, and is provided in the container 2 in a state of penetrating the container 2. By this proximal end side support member Ba and the distal end side support member Bb, the furnace tube 3 becomes a container. 2 is rotatably supported.
The base end side support member Ba and the front end side support member Bb have heat resistance against the temperature of the furnace tube 3 that is heated by the combustion gas E, and seals that prevent the saturated steam V and water W from leaking from the container 2. And a bearing having a heat resistant seal structure.
The motor 10 for generating the rotational driving force of the furnace tube 3 is installed outside the container 2, and is provided between the pulley 10 a and the outer peripheral surface 3 c of the tip side end 3 b of the furnace tube 3. The rotational driving force generated in the motor 10 by the transmission belt 12 is transmitted to the outer periphery of the furnace tube 3 to rotate the furnace tube 3.

Next, the porous body 9 will be described in detail based on FIG.
As described above, the porous body 9 is formed integrally with the outer peripheral surface 3 c of the outer peripheral surface 3 c of the furnace tube 3. In the present embodiment, the porous body 9 is formed of a sintered body obtained by depositing and sintering a copper sphere C having a particle system Cd of about 120 μm. The furnace tube 3 is formed of a copper tube which is an airtight body, and the outer peripheral surface 3c and the porous body 9 which is a sintered body of the copper sphere C are sintered and integrally formed (FIG. 1 and FIG. 2).

As shown in FIG. 3, gaps formed by a large number of sintered copper spheres C form communication pores H inside the porous body 9. The water W accommodated in the inside penetrates. The pore cross-sectional area Hd of the communication pore H is formed in a state where the communication pores H having various pore cross-sectional areas Hd are mixed.
In particular, in the communication pore H having a small pore cross-sectional area Hd, for example, the water W can permeate into the porous body 9 up to a position close to the outer peripheral surface 3c of the furnace tube 3 by capillary action. The cylinder 3 can generate the saturated vapor V by efficiently heating the water W in the vicinity of the outer peripheral surface 3c.
On the other hand, in the communicating pore H having a large pore cross-sectional area Hd, for example, the saturated vapor V generated by heating in the porous body 9 can be easily released to the outside of the porous body 9 and the porous body 9 is porous. The water W stored in the container 2 can be heated by releasing the water W before it becomes saturated vapor V by being permeated into the material 9 and heated.

For the average pore cross-sectional area of the pore cross-sectional area Hd of the porous body 9, for example, the particle system Cd of the copper sphere C to be sintered, the sintering temperature and the sintering time during sintering are changed. Can be adjusted by.
The average pore cross-sectional area of the communicating pores H of the porous body 9 is set to a predetermined value such as thermal efficiency based on the material of the porous body 9, the amount of heat transferred to the furnace tube 3, the amount of saturated steam generated, and the like. It can be set as appropriate to optimize the conditions.

Next, the tubular flame burner 20 will be described in detail with reference to FIG.
FIG. 4 is a longitudinal sectional view of the tubular flame burner 20. The tubular flame burner 20 provided at the proximal end 3a of the furnace tube 3 is a mixture of air A and fuel gas F toward the tangential direction of the inner peripheral surface 22a of the combustion chamber 22 formed in a cylindrical shape. The tubular flame burner 20 is formed by ejecting the gas M or ejecting the air A and the fuel gas F separately to form a tubular flame. Further, the combustion chamber 22 formed in the cylindrical shape of the tubular flame burner 20 and the axial center of the furnace tube 3 forming a double tube structure are provided on the proximal side surface 2a of the furnace tube 3 ( (See FIG. 1).

  The tubular flame burner 20 is composed of an air receiving space 23a for receiving air A from the air inlet 21a and a fuel gas receiving space 23b for receiving fuel gas F from the fuel gas inlet 21b. The receiving space 23 a and the fuel gas receiving space 23 b are provided in a state of being alternately arranged in the circumferential direction of the combustion chamber 22, with each pair sandwiching the combustion chamber 22. And the air supply path 24a which injects the air A from the air reception space 23a to the air-fuel mixture injection part 24c, and the fuel which supplies the fuel gas F from the fuel gas reception space 23b to the middle part of the flow path of the air supply path 24a A gas supply path 24b is provided.

  Thus, by supplying the fuel gas F from the fuel gas supply path 24b in the middle of the flow path of the air supply path 24a, an air-fuel mixture M of the air A and the fuel gas F is generated in the middle of the flow path and mixed. The air-fuel mixture M is ejected from the air ejection portion 24c toward the tangential direction of the inner peripheral surface 22a of the combustion chamber 22, and the air-fuel mixture M can be swirled in the same rotation direction in the combustion chamber 22. .

  Thus, the air-fuel mixture M that is mixed and adjusted to an appropriate air ratio within the combustible limit forms a so-called tubular flame having a hollow cylindrical shape in the combustion chamber 22. The inner part of the flame of the tubular flame is a high-temperature combustion gas E that has almost finished the combustion reaction, and the combustion gas E swirls the combustion chamber 22 along the axial direction of the combustion chamber 22 as a whole. Flow to the side. In this state, the air-fuel mixture M is almost completely combusted in the combustion chamber 22 by the combustion by the tubular flame in the combustion chamber 22, and the combustion gas E is emitted from the open end 22 b on the furnace tube 3 side of the combustion chamber 22. Discharged.

  Further, in the air receiving space 23a and the fuel gas receiving space 23b, air A and fuel gas F having low temperatures before combustion exist, and therefore the inner peripheral surface of the combustion chamber 22 by the air A and fuel gas F. The temperature rise of 22a can be suppressed and the flame temperature close | similar to an adiabatic flame is implement | achieved. Note that if air A is supplied in excess to cause lean combustion, the combustion temperature of the tubular flame is suppressed, and the generation of NOx is suppressed.

  When combustion is started in the tubular flame burner 20, the tubular flame burner 20 is ignited so that the tubular flame burner 20 can be automatically ignited by ignition means such as spark discharge (not shown). In addition, after ignition, the supply amount of the fuel gas F and the air A can be adjusted by a thermal power adjusting means (not shown) so that the thermal power can be adjusted. In the thermal power adjustment, the temperature of the combustion gas E or the superheated steam S is detected, the intensity of the thermal power is adjusted according to the detected temperature, and the temperature of the combustion gas E or the superheated steam S is adjusted to a desired temperature. It is configured to be able to.

When the tubular flame burner 20 is ignited and combustion is started, a tubular flame is formed in the combustion chamber 22 and the combustion gas E is introduced into the combustion gas flow path R1 of the furnace tube 3 as described above. The combustion gas E introduced into the combustion gas flow path R1 exchanges heat with the water W that has permeated the porous body 9 and the water W accommodated in the container 2 through the furnace tube 3 and the porous body 9, and the container. Saturated steam V can be generated in 2.
On the other hand, the generated saturated steam V is introduced into the combustion gas flow path R1 by introducing the open / close valve Rva into the inner pipe inner flow path R2 of the inner pipe 8 via the steam introduction flow path Rv. The burned combustion gas E exchanges heat with the saturated steam V flowing through the inner pipe inner flow path R2 through the inner pipe 8 to generate superheated steam S. Then, the combustion gas E having a low temperature after heat exchange is exhausted from the exhaust port 13 formed at the front end side end 3 b of the furnace tube 3.
Note that the saturated steam V generated in the container 2 can be taken out from the saturated steam outlet 4, and the superheated steam S generated in the inner pipe flow path R2 can be taken out from the outlet 11. For example, the superheated steam S can be adjusted in a temperature range of 300 ° C. to 500 ° C. and supplied to a steam cooker such as a conveyor oven.
[Another embodiment]
(A) In the above embodiment, the container 2 has a hollow rectangular parallelepiped shape. However, the present invention is not limited to this, and the container 2 may have a horizontal cylindrical shape. Furthermore, although the base end side surface 2a and the front end side surface 2b are flat, when the pressure in the container 2 is high, the base end side surface 2a and the front end side surface 2b are formed in a hemispherical shape. A pressure vessel may be used.

(B) A heat insulating process may be performed by providing a heat insulating material or the like on the outer peripheral wall of the container 2.

(C) A heat insulating material or the like may be provided on the outer peripheral wall of the steam introduction flow path Rv to perform heat insulation.

(D) In the above embodiment, the tubular flame burner 20 that forms and burns a tubular flame is used. However, the present invention is not limited to this, and a straight flame burner that burns by forming a straight flame or a swirling flame is formed. It is good also as a swirling flame burner which burns.

(E) In the above embodiment, the burner for generating the combustion gas E is provided on the base side surface 2a of the container 2, but the present invention is not limited to this, and a burner is installed inside the furnace tube 3. May be. Further, a burner that generates the combustion gas E may be provided separately from the container 2, and the combustion gas E may be introduced into the proximal end portion 3 a of the furnace tube 3.

(F) In the above embodiment, the furnace tube 3 is rotatably supported by the container 2, but the present invention is not limited thereto, and the furnace tube 3 may be provided in a state of being fixed to the container 2.

(G) In the above-described embodiment, the porous body 9 is composed of a sintered body of the copper sphere C. However, the porous body 9 is not limited to this, and the porous body 9 is formed by sintering a spherical metal, a spherical ceramic, or a mixture thereof. You may be comprised with a ligation.

(H) In the above-described embodiment, the inner peripheral surface 3d and the outer peripheral surface 3c of the furnace tube 3 are configured so as not to be uneven. However, the inner peripheral surface 3d of the furnace tube 3 is made of a material having good thermal conductivity. A plurality of heat transfer fins may be provided to enlarge the electric heating area in the combustion gas flow path R1. In addition, a plurality of heat transfer fins made of a material having good thermal conductivity may be provided on the outer peripheral surface 3 c of the furnace tube 3 to enlarge the electric heat area between the porous body 9.

(I) In the above-described embodiment, the inner peripheral surface and the outer peripheral surface of the inner tube 8 are configured to have no unevenness, but the heat transfer made of a material having good thermal conductivity on the inner peripheral surface of the inner tube 8. A plurality of fins may be provided to increase the electric heating area in the inner pipe flow path R2. Further, a plurality of heat transfer fins made of a material having a good thermal conductivity may be provided on the outer peripheral surface of the inner tube 8 to expand the electric heating area in the combustion gas flow path R1.

(J) In the above embodiment, the steam introduction flow path Rv is disposed outside the container 2, but the present invention is not limited thereto, and the steam introduction flow path Rv may be provided inside the container 2. Thereby, the temperature fall of the saturated steam V which distribute | circulates the vapor | steam introduction flow path Rv can be prevented by the thermal radiation from the surface of the vapor | steam introduction flow path Rv.

  As described above, it is possible to provide a steam generator that can quickly generate saturated steam while having a compact configuration.

DESCRIPTION OF SYMBOLS 1 Steam generator 2 Container 3 Furnace cylinder 3c Outer peripheral surface (outer peripheral side)
3d Inner peripheral surface 8 Inner tube 9 Porous body 10 Motor (rotation drive means)
20 Tubular flame burner 22 Combustion chamber 22a Inner peripheral surface A Air C Copper sphere (spherical metal)
E Combustion gas F Fuel gas M Mixture R1 Combustion gas flow path S Superheated steam V Saturated steam W Water

Claims (6)

A steam generator that generates saturated steam by heating water contained in a container by heat generated by combustion of a burner,
The container includes a furnace tube through which combustion gas generated by combustion of the burner flows, and a porous body provided on the outer peripheral side of the furnace tube in a state of being thermally connected to the furnace tube, The porous body has water permeability and is disposed in a state extending from below the surface of the water contained in the container to above the water surface, so that the water that has permeated the porous body is transmitted from the furnace tube. Heated to generate saturated steam ,
The furnace tube has a double pipe structure in which an inner tube extending along the axial direction of the furnace tube is provided inside the furnace tube, and a combustion gas formed between the furnace tube and the inner tube Flowing the combustion gas in a flow path, introducing the saturated steam generated by heat exchange between the combustion gas and water contained in the vessel through the furnace tube and the porous body into the inner pipe. A steam generator for generating superheated steam by heat exchange between the saturated steam introduced into the inner pipe and the combustion gas through the inner pipe and discharging the superheated steam from the inner pipe to the outside .   The burner is provided on the base end side in the axial direction of the furnace tube, and the burner has a combustion chamber formed in a cylindrical shape, and is directed toward the tangential direction of the inner peripheral surface of the combustion chamber. The steam generator according to claim 1, wherein the steam generator is a tubular flame burner that forms a tubular flame by ejecting an air-fuel mixture with fuel gas or ejecting air and fuel gas separately. The burner is provided on the base end side in the axial direction of the furnace tube, and the burner has a combustion chamber formed in a cylindrical shape, and is directed toward the tangential direction of the inner peripheral surface of the combustion chamber. It is a tubular flame burner that forms a tubular flame by ejecting an air-fuel mixture with fuel gas or ejecting air and fuel gas separately,
In flowing the combustion gas distally from the axial direction of the base end side in the combustion gas flow path formed between the front Symbol furnace tube within said tube,
2. The inner pipe is provided on the proximal end side in the axial direction so as to pass through the combustion chamber of the tubular flame burner and penetrate the combustion chamber to the proximal end side in the axial direction. Steam generator. The porous body is integrally formed on the outer peripheral surface of the furnace tube, and the furnace tube is configured to be rotatable with the axial direction of the furnace tube as a rotation axis, and the axial direction of the furnace tube is set as a horizontal direction. The steam generator as described in any one of Claim 1 to 3 provided with the rotational drive means installed in the said container and rotating the said furnace tube. The steam generator according to any one of claims 1 to 4 , wherein the porous body is formed of a sintered body of a block metal, a block ceramic, or a mixture thereof. The steam generator according to any one of claims 1 to 5 , wherein the furnace tube is formed as an airtight body having no gas permeability by the same material as that forming the porous body.

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