Apparatus for continuously supplying steam for soec

Abstract

The present invention relates to an apparatus for continuously supplying steam for an SOEC. The apparatus comprises: a steam generator which generates steam by heating water supplied from the outside while allowing the water to pass therethrough; and a steam temperature maintaining unit which is installed between the steam generator and an SOEC stack and prevents a temperature drop of the steam moving from the steam generator to the SOEC stack. The apparatus stably and continuously produces a constant amount of steam and prevents the temperature of the produced steam from dropping during transfer, and thus can deliver high-temperature steam to the SOEC stack to maintain an SOEC apparatus at peak performance.

Description

Continuous steam supply system for SOEC

[0001] The present invention relates to a continuous steam supply device configured to supply high-temperature steam to an SOEC stack, and more specifically, to a continuous steam supply device for an SOEC that prevents a drop in the temperature of the steam during transport and supplies high-temperature steam to the SOEC in a measured quantity, thereby maintaining the performance of the SOEC device at its best.

[0002] A Solid Oxide Electrolysis Cell (SOEC) is a device that decomposes water into hydrogen and oxygen through an electrochemical reaction opposite to that of a Solid Oxide Fuel Cell (SOFC), which operates at high temperatures. Since SOECs utilize steam at high temperatures to induce the water splitting reaction, the temperature and amount of steam directly affect the efficiency of the electrolysis reaction. For this reason, a steam supply at a constant temperature and flow rate is essential in SOEC systems, and the performance of the steam generator is critical to this.

[0003] Conventional steam generators have a simple structure in which water is placed in a tank equipped with a heater, and the heater is operated to boil the water and generate steam. However, this type of steam generator has the problem that the temperature and amount of generated steam are inconsistent. This is because the heater repeatedly turns on and off depending on the water temperature. In other words, when the heater is on, the water is heated and the amount of steam generated increases, but when the heater is turned off, the water temperature drops and the amount of steam generated decreases.

[0004] Such fluctuations in steam generation volume make it difficult to maintain consistency in steam temperature and supply volume, ultimately having a negative impact on the performance of the SOEC device. Therefore, there is a need for a steam generator capable of improving the performance of the SOEC device through a stable steam supply.

[0005] In addition, it is important to deliver the high-temperature steam generated from the steam generator to the SOEC stack while maintaining its temperature. This is because if the temperature drops while the steam is traveling along the transport path, the high efficiency of the steam generator becomes meaningless.

[0006] The present invention was created to resolve the above-mentioned problems and aims to provide a continuous steam supply device for SOEC that stably and continuously produces a constant amount of steam and prevents the temperature of the produced steam from dropping during transport, thereby delivering high-temperature steam to the SOEC stack and maintaining the performance of the SOEC device in an optimal state.

[0007] The continuous steam supply device for SOEC according to the present invention, as a means of solving the problem to achieve the above objective, comprises: a steam generator that generates steam by heating and passing water supplied from the outside through it; and a steam temperature maintaining unit installed between the steam generator and the SOEC stack, which prevents a drop in the temperature of the steam while it is moving from the steam generator to the SOEC stack.

[0008] In addition, the steam temperature maintaining unit comprises: a primary reheating unit installed in a steam transfer pipe that moves steam discharged from a steam generator and heats the steam transfer pipe, and a secondary reheating unit that reheats the steam that has passed through the steam transfer pipe and supplies it to the SOEC stack.

[0009] In addition, the primary reheating unit has a transfer pipe cover that surrounds the steam transfer pipe, a transfer pipe heater installed inside the transfer pipe cover and heating the steam transfer pipe, and a heater driving power source that supplies power to the transfer pipe heater.

[0010] In addition, the above primary reheating unit further includes a temperature sensor that detects the temperature of steam passing through the steam transfer pipe, and a controller that controls the heating temperature of the transfer pipe heater based on the sensing information of the temperature sensor.

[0011] And, the secondary heating unit comprises: a steam distributor that distributes steam delivered from a steam transfer pipe so that the steam moves along mutually different paths, and a distribution steam heater that heats the steam moving along each path in a distributed state.

[0012] Additionally, the steam distributor comprises a distribution manifold that receives and distributes delivered steam, a plurality of first ducts connected to the distribution manifold and receiving steam within the distribution manifold, a plurality of heat receiving tubes connected to the first ducts and passing steam within the first ducts, a plurality of second ducts arranged correspondingly to the first ducts and connected to the extended ends of the heat receiving tubes and receiving steam that has passed through the heat receiving tubes, and a receiving manifold that receives and combines steam within the second ducts and transmits it to an SOEC stack.

[0013] In addition, the above-mentioned distribution steam heater is positioned between the heat transfer tubes and heats the steam passing through the heat transfer tubes.

[0014] Additionally, the steam generator comprises a chamber that extends vertically and provides a sealed space, a water injection unit installed at the top of the chamber and injecting water into the chamber, an internal heater that heats the water injected from the water injection unit to generate steam, a heat transfer medium that fills the chamber, receives heat from the internal heater to heat it, and transfers heat to descending water, and a steam discharge unit that discharges the steam generated within the chamber through a steam transfer pipe.

[0015] In addition, the water injection unit includes a spray tube located at the top of the chamber that sprays water downward.

[0016] In addition, the water sprayer has an inlet pipe installed at the top of the chamber and receiving water supplied from the outside, and a spray bar connected to the inlet pipe, extending longitudinally within the chamber and having a plurality of water spray holes.

[0017] In addition, the heat transfer medium takes the form of a powder and heats water that is sprayed from a water sprayer and descends due to gravity by passing it through the pores.

[0018] And, the heat transfer medium includes silicon carbide (SiC).

[0019] In addition, the internal heaters have the shape of vertically extended rods, and a number of them are symmetrically arranged with respect to the vertical central axis of the chamber.

[0020] In addition, the interior of the chamber is further provided with a spacing member that maintains the spacing of the internal heaters.

[0021] In addition, the above-mentioned gap-maintaining member includes a support disc having the shape of a disc, with its peripheral portion fixed to the inner circumference of the chamber, and having a plurality of heater passage holes for passing an internal heater and a steam passage for passing steam downwards to guide it to the steam discharge portion.

[0022] In addition, the internal heater is equipped with a heat transfer surface area expander that expands the heat dissipation surface area of ​​the internal heater.

[0023] The continuous steam supply device for SOEC according to the present invention, configured as described above, can stably and continuously produce a constant amount of steam and prevent the temperature of the produced steam from dropping during transport, thereby delivering high-temperature steam to the SOEC stack and maintaining the performance of the SOEC device in an optimal state.

[0024] FIG. 1 is a block diagram illustrating the overall structure of a continuous steam supply device for SOEC according to one embodiment of the present invention.

[0025] FIG. 2 is a drawing illustrating the steam generator shown in FIG. 1 in more detail.

[0026] Figure 3 is a cross-sectional view illustrating the internal configuration of the steam generator of Figure 2.

[0027] Figure 4 is a cross-sectional view along line AA of Figure 3.

[0028] Figure 5 is a drawing showing the water spraying unit illustrated in Figure 3 separately.

[0029] Figure 6 is a plan view illustrating another example of the water spraying unit of Figure 3.

[0030] FIG. 7 is a cutaway perspective view showing the support disc illustrated in FIG. 3.

[0031] FIG. 8 is a drawing for explaining a configuration in which a heat transfer area expansion body is applied to the internal heater of FIG. 3.

[0032] FIG. 9 is a drawing showing the connection structure of a primary reheating unit and a secondary reheating unit applied to a steam continuous supply device for SOEC according to one embodiment of the present invention.

[0033] Figure 10 is a diagram illustrating the configuration of the primary reheating unit of Figure 9.

[0034] Figure 11 is a schematic diagram illustrating the structure of the secondary reheating unit of Figure 9.

[0035] Hereinafter, one embodiment according to the present invention will be described in more detail with reference to the attached drawings.

[0036] FIG. 1 is a block diagram illustrating the overall structure of a continuous steam supply device (10) for SOEC according to one embodiment of the present invention.

[0037] As described above, the steam continuous supply device (10) according to the present embodiment includes a water metering supply unit (11), a steam generator (20), and a steam temperature maintaining unit. The steam continuous supply device (10) serves to continuously supply high-temperature steam produced by the steam generator (20) to the SOEC stack (80).

[0038] The steam generator (20) generates steam by heating water supplied from the water metering supply unit (11) through the water supply pipe (11a) and passing it through the interior, and discharges the generated steam through the steam transfer pipe (34). Additionally, the steam temperature maintenance unit is installed between the steam generator (20) and the SOEC stack (80) and prevents a drop in the temperature of the steam while it is moving from the steam generator (20) to the SOEC stack (80). The steam temperature maintenance unit includes a primary reheating unit (40) and a secondary reheating unit (70).

[0039] The first reheating unit (40) is installed in the steam transfer pipe (34) and heats the steam transfer pipe (34) itself. The first reheating unit (40) prevents the steam from cooling down while passing through the steam transfer pipe (34). Then, the second reheating unit (40) reheats the steam that has passed through the steam transfer pipe (34) and delivers it to the SOEC stack (80). The SOEC stack (80) can generate hydrogen using the delivered steam as a raw material.

[0040] The secondary reheating unit (70) is housed in the furnace (60) together with the SOEC stack (80). The secondary reheating unit (70) reheats the steam that has passed through the steam transfer pipe (34) and supplies it to the SOEC stack. The furnace (60) accommodates the SOEC stack (80) and maintains a high temperature state. Since the SOEC stack (80) operates efficiently in a high temperature environment, the SOEC stack (80) is housed in the furnace (60) and maintained at a high temperature.

[0041] FIG. 2 is a drawing illustrating the steam generator shown in FIG. 1 in more detail, FIG. 3 is a cross-sectional view to explain the internal configuration of the steam generator of FIG. 2, and FIG. 4 is a cross-sectional view along line AA of FIG. 3.

[0042] As described above, the steam generator (20) can be fixed to an external support structure (51) via a fixing bracket (24). The steam generator (20) is installed vertically.

[0043] The steam generator (20) includes a chamber (21), a water injection section (25), a plurality of internal heaters (27), a heat transfer medium (29), and a steam discharge section.

[0044] The chamber (21) takes the shape of a cylinder, extends vertically, and provides a sealed space. The chamber (21) includes a main body (21a) of a certain diameter and a cap (21b) that seals the upper and lower ends of the main body.

[0045] The main body (21a) has the shape of a cylinder extended in the vertical direction and has service ports (21d) at two locations on the side. The service ports (21d) are ports that open the internal space of the chamber (21) to the outside and can be used for various purposes. For example, a pressure gauge (38) or a thermometer (39) can be mounted and operated on the service ports (21d). The cap (21b) is a plate-shaped member bolted to the upper and lower ends of the main body (21a). When the cap (21b) is removed, maintenance can be performed on the components inside the chamber (21).

[0046] Additionally, the water injection unit (25) is installed at the top of the chamber (21) and sprays water downward into the chamber. The water injection unit (25) is connected to the water metering supply unit (11) through the water supply pipe (11a). The water metering supply unit (11) supplies water at a flow rate set by the manager to the water injection unit. The flow rate of water supplied to the chamber (21) can be calculated accurately. Since all the water introduced into the chamber (21) is converted into steam, the amount of steam supplied can also be accurately predicted.

[0047] FIG. 5 is a drawing showing the water spraying unit (25) shown in FIG. 3 separately.

[0048] The water spray unit (25) illustrated in FIG. 5 is a vertical spray tube (25a) with its upper end connected to the water supply pipe (11a) and its lower end closed. A plurality of spray holes (25b) are formed in the spray tube (25a). The spray holes (25b) are nozzle-shaped holes that spray water introduced through the water supply pipe (11a) in a radial direction and downward. The inner diameter of the spray holes (25b) narrows from the inside to the outside of the spray tube (25a). As water passes through the spray holes (25b), it is accelerated and can reach further. As long as water can be supplied inside the chamber (21), the water spray unit can have various structures. FIG. 6 is a plan view illustrating a modified example of the water spray unit (25).

[0049] FIG. 6 is a plan view illustrating another example of the water spraying unit (25) of FIG. 3.

[0050] The water spraying unit (25) illustrated in FIG. 6 includes a vertical inlet pipe (25f) and a plurality of spray bars (25g). The inlet pipe (25f) is a vertical pipe connected to a water supply pipe (11a) and receives water supplied through the water supply pipe (11a) and directs it into the chamber (21). The inlet pipe (25f) is installed vertically in the center of the upper part of the chamber (21).

[0051] Additionally, the spray bar (25g) is a horizontal pipe connected to the inlet pipe, extending longitudinally within the chamber, and having a plurality of spray holes (25h). The spray bar (25g) extends radially around the inlet pipe (25f) and is symmetrical. In this embodiment, six spray bars (25g) are applied, but the number of spray bars (25g) applied may vary. The sum of the flow cross-sectional areas of the spray bars (25g) is equal to the flow cross-sectional area of ​​the inlet pipe (25f).

[0052] Water introduced through the inlet pipe (25f) splits at the bottom of the inlet pipe (25f) and flows into the spray bar (25g). Additionally, the water flowing into the spray bar (25g) spreads widely as it moves along the longitudinal direction of the spray bar (25g) in the radial direction of the chamber and is ejected through the spray hole (25h). When the spray bar (25g) is applied, water can be ejected more widely.

[0053] The water ejected through the above-mentioned water spray unit (25) descends by passing through the pores of the powder-type heat transfer medium (29) described later due to the action of gravity. In particular, as the descending water passes through the pores, it is repeatedly split and broken into very small 'fine water droplets'. As the size of the water droplets decreases, the surface area per unit volume increases, so heat transfer occurs more quickly and heating occurs faster. The finely divided water droplets receive direct heat generated by the internal heater (27) and indirect heat from the heat transfer medium (29) heated by the heater, and are converted into steam at a very high speed.

[0054] Additionally, the internal heater (27) serves to generate steam by heating the water sprayed from the water spray unit (25). The internal heater (27) includes a heater case (27a) and a head (27e). The heater case (27a) is a pipe-shaped hollow member with a closed bottom and accommodates a heating element (not shown) inside. The heating element generates heat by power applied through an external heater drive unit (36 in FIG. 2). The head (27e) is fixed to the upper part of the heater case (27a) and connects the heating element to a connecting module (23).

[0055] The head (27e) is exposed to the upper part of the chamber (21) and is covered by a protective cover (22). The protective cover (22) protects the head (27e) while housing it. Additionally, a connecting module (23) is mounted on the protective cover (22). The connecting module (23) is an electrical element that is electrically connected to each internal heater (27). The heater driving unit (36) is connected to the internal heater (27) through the connecting module (23) and drives the internal heater (27). For example, it turns the internal heater (27) on and off or controls the heating temperature of the heater. For example, it causes the internal heater (27) to output heat of 100°C to 350°C.

[0056] In addition, as shown in FIG. 4, the internal heaters (27) are symmetrically arranged inside the chamber (21). That is, six internal heaters (27) are arranged equilaterally with respect to the central axis of the chamber (21), which is filled with a heat transfer medium (29). The imaginary straight line connecting the internal heaters (27) takes the shape of a hexagon.

[0057] Furthermore, as illustrated in FIG. 8, a heat transfer area expansion body (28) may be additionally applied to the internal heater (27). FIG. 8 is a drawing for explaining an example configuration in which a heat transfer area expansion body (28) is mounted on the internal heater (27).

[0058] The heat transfer area expansion body (28) serves to expand the heat dissipation area of ​​the internal heater (27). The heat transfer area expansion body (28) can be made of aluminum or copper and accommodates a heater case (27a) inside it. The outer surface of the heater case (27a) and the inner surface of the heat transfer area expansion body (28) are in close contact. In addition, an uneven surface (28a) is formed on the outer surface of the heat transfer area expansion body (28). By applying the uneven surface (28a), the heat transfer area can be expanded. By additionally installing the heat transfer area expansion body (28) in this manner, the heat dissipation area of ​​heat generated from the heater increases, thereby further improving energy efficiency. As long as the heat transfer area can be expanded, the configuration of the heat transfer area expansion body can be changed in various ways.

[0059] Meanwhile, the heat transfer medium (29) is a powder-type element filled inside the chamber (21). The heat transfer medium (29) receives heat from the internal heater (27) inside the chamber and is heated, and transfers heat to the descending water to heat and vaporize the water. That is, in a state where it is heated itself, it heats the water that is sprayed from the water spraying part (25) and descends due to the action of gravity, passing it through the air gaps to generate steam.

[0060] The heat transfer medium in this embodiment is silicon carbide (SiC). The particle size of the silicon carbide can be varied, for example, it may have a particle size of 20 μm to 100 μm.

[0061] As is known, silicon carbide has high thermal conductivity and a very high melting point, which provides excellent thermal stability and allows it to maintain its physical and chemical properties stably even in high-temperature environments. In particular, it has a low coefficient of thermal expansion, so it hardly expands or contracts with changes in temperature. Since there is no concern about expansion, the heat transfer medium (29) can be filled inside the chamber (21). Of course, the more heat transfer medium (29) is added, the larger the heating surface area for the water becomes.

[0062] Since the heat transfer medium (29) itself has thermal conductivity, the heat emitted from the internal heater (27) is first transferred to the heat transfer medium (29) in direct contact with the internal heater (27), and then transferred sequentially to the surrounding heat transfer medium (29). Since the heat transfer medium (29) completely fills the interior of the chamber (21), the temperature inside the chamber (21) can be maintained uniformly. Eventually, the water sprayed from the water sprayer gradually descends due to the action of gravity, is heated by the heat transfer medium (29), and changes into steam.

[0063] The generated steam rises and fills the internal space of the chamber from the top. After the internal space of the chamber is completely filled with steam, the steam descends, passes downward through the support disc (31), and is discharged through the steam discharge section to the steam transfer pipe (34).

[0064] Additionally, a spacing member is further provided inside the chamber (21). The spacing member maintains the spacing of the internal heater (27) and also serves to guide steam to the steam discharge member, i.e., the steam discharge tube (33). In this embodiment, the spacing member includes a support disc (31).

[0065] Figure 7 is a drawing illustrating the support disk (31) above.

[0066] The support disc (31) is a disc-shaped member having a certain thickness. The periphery, or edge, of the support disc (31) is welded and fixed to the inner circumference of the chamber body (21a). Six heater passage holes (31a) are formed in the support disc (31). The heater passage holes (31a) are holes through which internal heaters (27) pass. As the internal heaters (27) are fitted into the heater passage holes (31a), the spacing between the internal heaters (27) can be maintained at a constant level.

[0067] Additionally, a plurality of steam passages (31c) are provided in the main portion of the support disc (31). The steam passages (31c) are passages through which steam generated inside the chamber passes. The steam guided downward through the steam passages (31c) passes through the lower space of the support disc (31) and exits through the discharge hole (33a) of the steam discharge tube (33).

[0068] The steam discharge tube (33) is a steam discharge section that discharges steam generated inside the chamber into the steam transfer pipe (34). The steam discharge tube (33) is a vertical pipe of a certain diameter, the upper end is fixed to the bottom surface of the support disc (31), and the lower end is connected to the steam transfer pipe (34) while extending to the bottom of the chamber (21). A plurality of discharge holes (33a) are formed in the steam discharge tube (33). Steam passes through the discharge holes (33a) and is discharged into the steam transfer pipe (34).

[0069] FIG. 9 is a drawing showing the connection structure of a primary reheating unit (40) and a secondary reheating unit (70) applied to a steam continuous supply device for SOEC according to one embodiment of the present invention.

[0070] As described above, the primary reheating unit (40) and the secondary reheating unit (70) are arranged in series along the direction of steam transfer. As mentioned, the primary reheating unit (40) prevents a temperature drop of the steam passing through the steam transfer pipe (34), and the secondary reheating unit (70) serves to heat the steam exiting the steam transfer pipe (34) one last time.

[0071] FIG. 10 is a drawing for explaining the configuration of the primary reheating unit (40) of FIG. 9.

[0072] The primary reheating unit (40) is installed in the steam transfer pipe (34) and heats the steam transfer pipe (34) itself. The primary reheating unit (40) includes a transfer pipe cover (41), an insulation liner (43), a transfer pipe heater (45), a temperature sensor (47), and a temperature control unit (49). Multiple primary reheating units (40) may be applied depending on the length or curved shape of the steam transfer pipe (34).

[0073] The transfer pipe cover (41) is a member that extends along the longitudinal direction of the steam transfer pipe (34) and surrounds the steam transfer pipe (34). The transfer pipe cover (41) blocks the steam transfer pipe (34) from the outside air. Additionally, the insulation liner (43) is an insulating member installed on the inner side of the transfer pipe cover (41). The insulation liner (43) prevents heat inside the transfer pipe cover (41) from being lost to the outside of the transfer pipe cover (41).

[0074] Additionally, the transfer pipe heater (45) heats the steam transfer pipe (34) while installed inside the transfer pipe cover (41). The structure of the transfer pipe heater (45) may vary, for example, it may be a coil-type heater that passes the steam transfer pipe (34) through its interior. The heat generated by the transfer pipe heater (45) is transferred to the steam inside the steam transfer pipe (34) through the steam transfer pipe (34).

[0075] The temperature sensor (47) is a temperature sensing unit that detects the temperature of the steam flowing through the steam transfer pipe (34). The detection information of the temperature sensor (47) is transmitted to the controller (49e) of the temperature control unit (49).

[0076] The temperature control unit (49) includes a heater driving power supply (49a) and a controller (49e). The heater driving power supply (49a) supplies power to the transfer pipe heater (45). Additionally, the controller (49e) controls the heating temperature of the transfer pipe heater (45) based on the sensing information of the temperature sensor (47). That is, the temperature of the transfer pipe heater (45) is controlled by adjusting the output of the heater driving power supply (49a).

[0077] FIG. 11 is a partially exploded perspective view to explain the configuration of the secondary reheating unit (70) of FIG. 9.

[0078] The secondary reheating unit (70) is responsible for reheating the steam that has passed through the steam transfer pipe and supplying it to the SOEC stack (80), and includes a steam distributor (75) and a distribution steam heater (71).

[0079] The steam distributor (75) distributes the steam delivered from the steam transfer pipe (34) so ​​that the steam travels along mutually different paths. In other words, it splits the flow of steam passing through a single passage to pass through multiple passages. The reason for separating the steam passages in this way is, of course, to increase the heating efficiency of the steam.

[0080] As illustrated in FIG. 11, the steam distributor (75) includes a distribution manifold (77a), a plurality of first ducts (75a), heat supply tubes (75c), second ducts (75e), and a receiving manifold (77b).

[0081] The distribution manifold (77a) is a vertically positioned hollow pipe. The upper part of the distribution manifold (77a) is connected to the steam transfer pipe (34), and the lower part is closed. The distribution manifold (77a) receives steam delivered from the steam transfer pipe (34) and then sends it out to a plurality of first ducts (75a).

[0082] The first duct (75a) is a hollow member with one end connected to the distribution manifold (77a). Steam inside the distribution manifold (77a) moves to the first duct (75a). In particular, multiple first ducts (75a) are arranged vertically at regular intervals while maintaining a horizontal position. The number of first ducts (75a) may vary. Steam inside the distribution manifold (77a) flows into each first duct (75a). If there are five first ducts (75a), 1 / 5 of the steam inside the distribution manifold (77a) flows into each first duct (75a).

[0083] As steam inside the distribution manifold (77a) moves to a plurality of first ducts (75a), the surface area of ​​the steam increases significantly. Since the steam fills the internal space of the first ducts (75a), the surface area of ​​the steam is equal to the surface area of ​​the first ducts (75a). The surface area of ​​the first ducts is a heat-receiving surface area capable of receiving heat from the outside.

[0084] Additionally, the heat transfer tube (75c) is a tube that extends horizontally with one end connected to the first duct (75a). A plurality of heat transfer tubes (75c) are parallel to each other. Furthermore, the sum of the surface areas of all heat transfer tubes (75c) is greater than the surface area of ​​the first duct (75a). The heat transfer surface area of ​​the steam is expanded once again.

[0085] The extended end of the heat supply tube (75c) is connected to the second duct (75e). Steam inside the first duct (75a) moves to the second duct (75e) through the heat supply tube (75c). The second duct (75e) is positioned corresponding to the first duct (75a), is connected to the extended end of the heat supply tube, and receives the steam that has passed through the heat supply tube. The steam that has passed through the heat supply tube (75c) is combined within the second duct (75e).

[0086] Additionally, the second duct (75e) is connected to the receiving manifold (77b). Steam within the second duct (75e) flows into the receiving manifold (77b) and is combined again. The steam collected in the second duct (75e) is supplied to the SOEC stack (80) through the steam pipe (79).

[0087] The distribution steam heater (71) serves to heat the steam moving along each path in a distributed state. The distribution steam heater (71) generates heat by receiving power from a separate power source (73).

[0088] The distribution steam heater (71) is a plate heater and is positioned between the heat supply tubes (75c) as shown in FIG. 11. That is, it heats the steam passing through the heat supply tubes while positioned between the heat supply tubes (75c).

[0089] Of course, the heat generated from the distribution steam heater (71) is also transferred to the first and second ducts (75a, 75e). The heat generated from the distribution steam heater (71) is transferred to the steam through the heat receiving tube (75c). Consequently, the steam is transferred to the SOEC stack (80) in a heated state once again while moving from the distribution manifold (77a) to the receiving manifold (77b).

[0090] Although the present invention has been described in detail through specific embodiments, the present invention is not limited to the above embodiments, and various modifications can be made by those skilled in the art within the scope of the technical concept of the present invention.

Claims

1. A steam generator that generates steam by heating and passing water supplied from the outside through it; A steam temperature maintaining unit installed between the steam generator and the SOEC stack, which prevents a drop in steam temperature while it is moving from the steam generator to the SOEC stack, Continuous steam supply device for SOEC.

2. In Paragraph 1, The above steam temperature maintaining unit is; A primary reheating unit installed in a steam transfer pipe that moves steam discharged from a steam generator and heats the steam transfer pipe, and A secondary reheating unit comprising a secondary reheating unit that reheats steam passing through a steam transfer pipe and supplies it to an SOEC stack. Continuous steam supply device for SOEC.

3. In Paragraph 2, The primary reheat unit is; A transfer pipe cover that surrounds the steam transfer pipe, and A transfer pipe heater installed inside the transfer pipe cover and heating the steam transfer pipe, and Includes a heater driving power supply that supplies power to the transfer pipe heater, Continuous steam supply device for SOEC.

4. In Paragraph 3, The above primary reheating unit includes, A temperature sensor that detects the temperature of steam passing through a steam transfer pipe, and A controller further comprising a controller that controls the heating temperature of the transfer pipe heater based on sensing information from a temperature sensor, Continuous steam supply device for SOEC.

5. In Paragraph 2, The above secondary heating unit is; A steam distributor that distributes steam delivered from a steam transfer pipe so that the steam travels along mutually different paths, and Includes a distribution steam heater that heats steam moving along each path in a distributed state, Continuous steam supply device for SOEC.

6. In Paragraph 5, The above steam distributor is, A distribution manifold that receives and distributes the delivered Steem, and A plurality of first ducts connected to a distribution manifold and receiving steam within the distribution manifold, and A plurality of heat transfer tubes connected to the first duct and passing steam within the first duct, and A plurality of second ducts arranged corresponding to the first duct, connected to the extended end of the heat transfer tube, and receiving steam that has passed through the heat transfer tube, and A receiving manifold equipped with a receiving manifold that receives steam from the second duct, combines it, and then transmits it to the SOEC stack. Continuous steam supply device for SOEC.

7. In Paragraph 6, The above distribution steam heater is, A device placed between heat transfer tubes and heating steam passing through the heat transfer tubes, Continuous steam supply device for SOEC.

8. In Paragraph 2, The above steam generator is, A chamber that extends vertically and provides a sealed space, and A water spray unit installed at the top of the chamber and spraying water into the chamber, and An internal heater that heats water sprayed from a water spray unit to generate steam, and A heat transfer medium that is filled inside the chamber, heats up by receiving heat from an internal heater, and transfers heat to descending water, and A steam discharge unit comprising a steam discharge section that discharges steam generated within a chamber into a steam transfer pipe. Continuous steam supply device for SOEC.

9. In Paragraph 8, In the above water spray unit, Includes a spray tube located at the top of the chamber that sprays water downward. Continuous steam supply device for SOEC.

10. In Paragraph 8, The above water spray unit is, An inlet pipe installed at the top of the chamber and receiving water supplied from the outside, and Having a spray bar connected to an inlet tube, extending longitudinally within a chamber, and having a plurality of water spray holes, Continuous steam supply device for SOEC.

11. In Paragraph 8, The above heat transfer medium is, It takes the form of a powder and heats water that is sprayed from a water sprayer and descends due to the action of gravity by passing it through the pores. Continuous steam supply device for SOEC.

12. In Paragraph 11, The above heat transfer medium includes silicon carbide (SiC). Continuous steam supply device for SOEC.

13. In Paragraph 8, The above internal heaters take the shape of vertically extended rods, and a plurality of them are symmetrical with respect to the vertical central axis of the chamber. Continuous steam supply device for SOEC.

14. In Paragraph 13, Inside the above chamber, a spacing member for maintaining the spacing of internal heaters is further provided. Continuous steam supply device for SOEC.

15. In Paragraph 14, In the above spacing member, A support disc having the shape of a disc, with a peripheral portion fixed to the inner circumference of a chamber, and comprising a plurality of heater passage holes for passing an internal heater, and a steam passage for passing steam downward and guiding it to the steam discharge portion. Continuous steam supply device for SOEC.

16. In Paragraph 13, The above internal heater, Equipped with a heat transfer surface area expander that expands the heat dissipation surface area of ​​the internal heater, Continuous steam supply device for SOEC.

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