Steam generator

Abstract

Provided is a steam generator. The steam generator comprises an evaporator housing (01) and an evaporation core (02). The evaporation core (02) comprises a plurality of partition plates (1) arranged in sequence, an evaporation heat exchange plate (2) is provided between any two adjacent partition plates (1), and the evaporation heat exchange plate (2) has a cold side (21) and a hot side (22); the cold side (21) of the evaporation heat exchange plate (2) and an adjacent partition plate (1) are connected to each other to form an evaporation chamber (3); a first porous medium layer (33) is provided in an evaporation area of the evaporation chamber (3); and the hot side (22) of the evaporation heat exchange plate (2) and an adjacent partition plate (1) are connected to each other to form a heat exchange chamber (4). The first porous medium layer (33) is provided in the evaporation chamber (3), and a heat supply medium enters the heat exchange chamber (4), so as to supply heat to the evaporation chamber (3); and liquid enters the evaporation chamber (3) and then is heated and evaporated to generate steam.

Description

A steam generator Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a water vapor generator. Background Art

[0002] Water vapor plays a very important role in solid oxide fuel cell power generation systems. The main performances are as follows: (1) The ratio of water vapor to carbon in the airflow entering the reformer is a key factor affecting the reforming reaction; (2) A stable ratio of water vapor to carbon in the fuel airflow entering the fuel cell can prevent carbon deposition and extend the life of the solid oxide fuel cell power generation system; (3) The pressure and flow of water vapor can affect the changes in the combustion components in the downstream burner, affecting the stable operation of the burner. Therefore, maintaining a stable water vapor flow rate and accurately controlling the water vapor to carbon ratio are important considerations in the design of water vapor generators in solid oxide fuel cell power generation systems.

[0003] Existing steam generators include electric heating and convection heat exchange types. Electric heating steam generators suffer from uneven heat exchange, making convection heat exchangers more commonly used in solid oxide fuel cell power generation systems. However, existing convection heat exchange steam generators typically have fins on both the cold and hot sides. During the boiling process, the liquid water on the cold side undergoes a phase change, and bubbles continuously form at the vaporization core of the hot wall. The formation and collapse of these bubbles causes pressure and flow fluctuations, resulting in unstable steam emissions from the steam generator, and large fluctuations in both steam flow and steam pressure.

[0004] Therefore, it is very necessary to design a steam generator that can stably discharge water vapor. Summary of the Invention

[0005] The object of the present invention is to overcome the deficiencies of the prior art and provide a steam generator capable of stably discharging steam.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] The heat dissipation fan of claim 1, wherein the heat dissipation in the heat dissipation chamber is connected to the heat dissipation chamber to form a heat dissipation chamber. The heat dissipation chamber has a bottom surface and a bottom surface, and the top surface of the heat dissipation chamber is connected to the heat dissipation chamber to form a heat dissipation chamber. The heat dissipation chamber has a bottom surface and a bottom surface.

[0008] The water vapor generator of the present invention forms an evaporation chamber by interconnecting the cold side of the evaporation heat exchange plate with the adjacent partition, and forms a heat exchange chamber by interconnecting the hot side of the evaporation heat exchange plate with the adjacent partition. The heating medium enters the heat exchange chamber and is conducted through the evaporation heat exchange plate to provide heat for the evaporation chamber; after the liquid enters the evaporation chamber, it is heated and evaporated to generate steam; the present invention is provided with a first porous medium layer in the evaporation area, and the first porous medium layer can suppress the evaporation of liquid flowing through the first porous medium layer to generate large bubbles, so that the water vapor generator can stably discharge steam and reduce the fluctuation of the discharged steam flow rate and pressure.

[0009] In the present invention, preferably, the outer wall surface of the first porous medium layer is closely matched with the inner wall surface of the evaporation zone.

[0010] As a preferred embodiment of the present invention, the height ratio of the first porous medium layer to the evaporation zone is (0.02-1):1.

[0011] As a preferred embodiment of the present invention, the material of the first porous medium layer is at least one of foam metal and foam ceramic; the foam metal includes at least one of foam iron, foam nickel, foam copper, foam aluminum, foam aluminum alloy, foam iron-nickel alloy, foam nickel-cobalt alloy, foam titanium, foam titanium alloy, foam silver, and foam steel; the foam ceramic includes at least one of foam alumina ceramic, foam zirconia ceramic, and foam silicon carbide ceramic.

[0012] The material of the first porous medium layer is preferably foam metal, and the foam metal is preferably at least one of foam iron, foam nickel, foam aluminum alloy, foam iron-nickel alloy, foam cobalt-nickel alloy, foam titanium and foam titanium alloy.

[0013] As a preferred embodiment of the present invention, the porosity of the first porous medium layer is not less than 85%; the pore density of the first porous medium layer is not greater than 200 ppi.

[0014] As a preferred embodiment of the present invention, the evaporation zone is further provided with a first fin array, and the first fin array is located between the first porous medium layer and the steam outflow zone.

[0015] Furthermore, the first fin array includes a plurality of first fins arranged in an array, the first fins extending along the height direction of the evaporation zone, the height of the first fins is 2 to 40 mm, the thickness of the first fins is 0.05 to 3 mm; the spacing between any two adjacent first fins is 0.5 to 5 mm.

[0016] As a preferred embodiment of the present invention, a first gap is left between the first fin array and the first porous medium layer, and the height ratio of the first gap to the evaporation zone is (0.05-0.1):1.

[0017] The inventors have discovered that by leaving a gap between the first fin array and the first porous medium layer, the steam escaping from the pores of the first porous medium layer can be mixed in the gap, so that the steam flowing to the area where the first fin array is located has the same temperature and flow rate, avoiding the temperature gradient formed on the surface of the first fin array and the generation of thermal stress, thereby avoiding deformation damage to the first fin.

[0018] As a preferred embodiment of the present invention, at least one of a second porous medium layer and a second fin array is provided in the heat exchange chamber.

[0019] As a preferred embodiment of the present invention, the liquid inlet is connected to the outlet end of the cold side inlet diverter, the inlet end of the cold side inlet diverter is connected to a water inlet pipe, and the water inlet pipe is provided with a cold side inlet pressure gauge, a water flow meter and a water pump; the steam outlet is connected to the inlet end of the cold side outlet manifold, the outlet end of the cold side outlet manifold is connected to a steam pipe, and the steam pipe is provided with a cold side outlet pressure gauge.

[0020] As a preferred embodiment of the present invention, the heating medium inlet is connected to the outlet end of the hot side inlet diverter, the inlet end of the hot side inlet diverter is connected to the heating medium input pipe, and the heating medium input pipe is provided with a hot side inlet pressure gauge, a heating medium flow meter and a delivery pump; the heating medium outlet is connected to the inlet end of the hot side outlet manifold, and the outlet end of the hot side outlet manifold is connected to the heating medium output pipe.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The water vapor generator of the present invention forms an evaporation chamber by interconnecting the cold side of the evaporation heat exchange plate with the adjacent partition, and forms a heat exchange chamber by interconnecting the hot side of the evaporation heat exchange plate with the adjacent partition. The heating medium enters the heat exchange chamber and is conducted through the evaporation heat exchange plate to provide heat for the evaporation chamber; after the liquid enters the evaporation chamber, it is heated and evaporated to generate steam; the present invention is provided with a first porous medium layer in the evaporation area, and the first porous medium layer can suppress the evaporation of liquid flowing through the first porous medium layer to generate large bubbles, so that the water vapor generator can stably discharge steam, and the discharged steam flow rate and pressure fluctuations are small; the water vapor generator provided by the present invention is suitable for solid oxide fuel cell power generation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic structural diagram of a steam generator provided by the present invention;

[0024] FIG2 is a front view of the evaporation core provided by the present invention;

[0025] FIG3 is a cross-sectional view of an evaporation chamber provided in one embodiment of the present invention;

[0026] FIG4 is a cross-sectional view of a heat exchange chamber provided in one embodiment of the present invention;

[0027] FIG5 is a cross-sectional view of an evaporation chamber provided in another embodiment of the present invention;

[0028] FIG6 is a cross-sectional view of an evaporation chamber provided in a comparative example of the present invention;

[0029] FIG7 is a cross-sectional view of a heat exchange chamber provided in another embodiment of the present invention;

[0030] FIG8 is a cross-sectional view of a heat exchange chamber provided in yet another embodiment of the present invention.

[0031] In the figure, 01-evaporator shell, 02-evaporator core, 1-partition, 2-evaporation heat exchange plate, 21-cold side, 22-hot side, 3-evaporation chamber, 31-liquid inlet, 32-steam outlet, 33-first porous medium layer, 34-first fin, 35-first gap, 4-heat exchange chamber, 41-heating medium inlet, 42-heating medium outlet, 43-second porous medium layer, 44-second fin, 45-second gap, 5-cold side inlet pressure gauge, 6-water flow meter, 7-water pump, 8-cold side outlet pressure gauge. DETAILED DESCRIPTION

[0032] In order to better illustrate the purpose, technical solutions and advantages of the present invention, the present invention will be further described below in conjunction with specific embodiments.

[0033] Referring to Figures 1 to 5 and Figures 7 to 8, the present invention provides a water vapor generator, including an evaporator shell 01 and an evaporator core 02. The interior of the evaporator shell 01 is hollow, and the evaporator core 02 is arranged in the evaporator shell 01. The evaporator core 02 includes a plurality of partitions 1 arranged in sequence, and an evaporation heat exchange plate 2 is arranged between any two adjacent partitions 1; the evaporation heat exchange plate 2 has a cold side 21 and a hot side 22 opposite to the cold side 21; the cold side 21 of the evaporation heat exchange plate 2 and the adjacent partition 1 are connected. They are interconnected to form an evaporation chamber 3; the evaporation chamber 3 is provided with a liquid inlet 31 and a steam outlet 32; the evaporation chamber 3 is composed of a liquid inlet area, an evaporation area and a steam outflow area arranged in sequence, the liquid inlet area is connected to the liquid inlet 31, the steam outflow area is connected to the steam outlet 32, and a first porous medium layer 33 is provided in the evaporation area; the hot side 22 of the evaporation heat exchange plate 2 is interconnected with the adjacent partition 1 to form a heat exchange chamber 4; the heat exchange chamber 4 is provided with a heating medium inlet 41 and a heating medium outlet 42.

[0034] The heating medium enters the heat exchange chamber 4 and is conducted through the evaporation heat exchange plate 2 to provide heat for the evaporation chamber 3. After the liquid enters the evaporation chamber 3, it is heated and evaporated to generate steam. The present invention provides a first porous medium layer 33 in the evaporation area. The first porous medium layer 33 can suppress the evaporation of the liquid flowing through the first porous medium layer 33 to generate large bubbles, thereby enabling the steam generator to stably discharge steam and reduce the fluctuation of the discharged steam flow rate and pressure.

[0035] In one embodiment, the outer wall surface of the first porous medium layer 33 is closely matched with the inner wall surface of the evaporation zone.

[0036] In one embodiment, the height ratio of the first porous medium layer 33 to the evaporation zone is (0.02-1): 1. The height ratio of the first porous medium layer 33 to the evaporation zone is 1:1, which means that the first porous medium layer 33 fills the entire evaporation zone.

[0037] In one embodiment, the material of the first porous medium layer 33 is at least one of foam metal and foam ceramic; the foam metal includes at least one of foam iron, foam nickel, foam copper, foam aluminum, foam aluminum alloy, foam iron-nickel alloy, foam nickel-cobalt alloy, foam titanium, foam titanium alloy, foam silver, and foam steel; the foam ceramic includes at least one of foam alumina ceramic, foam zirconia ceramic, and foam silicon carbide ceramic.

[0038] The material of the first porous medium layer 33 is preferably foam metal, and the foam metal is preferably at least one of foam iron, foam nickel, foam aluminum alloy, foam iron-nickel alloy, foam cobalt-nickel alloy, foam titanium and foam titanium alloy.

[0039] In one embodiment, the porosity of the first porous medium layer 33 is not less than 85%, more preferably 90-98%; the pore density of the first porous medium layer 33 is not greater than 200 ppi, more preferably 50-80 ppi.

[0040] The inventors have found that if the porosity of the first porous medium layer 33 is lower than 85%, the pressure loss in the area where the first porous medium layer 33 is located will be too large, making it difficult for the liquid to flow into the steam generator; if the pore density of the first porous medium layer 33 is greater than 200 ppi, the strength of the first porous medium layer 33 will be insufficient, which will cause the steam generator to be easily deformed.

[0041] In one embodiment, the evaporation zone is further provided with a first fin array, which is located between the first porous medium layer 33 and the steam outflow zone; the first fin array is composed of a plurality of first fins 34 arranged in an array, and the plurality of first fins 34 divide the evaporation zone into a plurality of flow channels.

[0042] Specifically, the distance between any two adjacent first fins 34 is 0.5-5 mm; the first fins 34 extend along the height direction Z1 of the evaporation zone, the height of the first fins 34 is 2-40 mm, and the thickness of the first fins 34 is 0.05-3 mm.

[0043] Specifically, the first fin 34 is at least one of a straight fin, a serrated fin, a corrugated fin, and a perforated fin.

[0044] Specifically, a first gap 35 is left between the first porous medium layer 33 and the first fin array, and the height ratio of the first gap 35 to the evaporation zone is (0.05-0.1):1; the height ratio of the first porous medium layer 33 to the evaporation zone is (0.02-0.5):1, and the height ratio of the first fin array to the evaporation zone is (0.4-0.93):1.

[0045] The inventors have discovered that by leaving a first gap between the first fin array and the first porous medium layer 33, the steam escaping from the pores of the first porous medium layer 33 can be mixed in the first gap, so that the steam flowing to the area where the first fin array is located has the same temperature and flow rate, avoiding the temperature gradient formed on the surface of the first fin array and the generation of thermal stress, thereby avoiding deformation damage to the first fin.

[0046] In one embodiment, at least one of a second porous medium layer 43 and a second fin array is disposed in the heat exchange chamber 4 .

[0047] Specifically, a second porous medium layer 43 is provided in the heat exchange chamber 4, and the outer wall surface of the second porous medium layer 43 is closely matched with the inner wall surface of the heat exchange chamber 4; the height ratio of the second porous medium layer 43 to the heat exchange chamber 4 is (0.02~1):1.

[0048] Specifically, a second fin array is provided in the heat exchange chamber 4 , and a height ratio between the second fin array and the heat exchange chamber 4 is (0.4-1):1.

[0049] Specifically, a second porous medium layer 43 and a second fin array are provided in the heat exchange chamber 4, the outer wall surface of the second porous medium layer 43 is tightly matched with the inner wall surface of the heat exchange chamber 4, and the heating medium inlet 41, the second porous medium layer 43, the second fin array and the heating medium outlet 42 are arranged in sequence; a second gap 45 is left between the second porous medium layer 43 and the second fin array; the height ratio of the second gap 45 to the heat exchange chamber 4 is (0.05~0.1):1, the height ratio of the second porous medium layer 43 to the heat exchange chamber 4 is (0.02~0.5):1, and the height ratio of the second fin array to the heat exchange chamber 4 is (0.4~0.93):1.

[0050] Specifically, the material of the second porous medium layer 43 is at least one of foam metal and foam ceramic; the foam metal includes at least one of foam iron, foam nickel, foam copper, foam aluminum, foam aluminum alloy, foam iron-nickel alloy, foam nickel-cobalt alloy, foam titanium, foam titanium alloy, foam silver, and foam steel; the foam ceramic includes at least one of foam alumina ceramic, foam zirconia ceramic, and foam silicon carbide ceramic.

[0051] The material of the second porous medium layer 43 is preferably foam metal, and the foam metal is preferably at least one of foam iron, foam nickel, foam aluminum alloy, foam iron-nickel alloy, foam cobalt-nickel alloy, foam titanium and foam titanium alloy.

[0052] Specifically, the porosity of the second porous medium layer 43 is not less than 85%; the pore density of the second porous medium layer 43 is not greater than 200 ppi, and more preferably 50-80 ppi.

[0053] Specifically, the second fin array includes a plurality of second fins 44, which divide the heat exchange chamber 4 into a plurality of flow channels, and the plurality of second fins 44 are arranged in an array; the second fins 44 extend along the height direction Z2 of the heat exchange chamber 4, and the height of the second fins 44 is the height of the second fin array; the spacing between any two adjacent second fins 44 is 0.5 to 5 mm, the height of the second fins 44 is 2 to 40 mm, and the thickness of the second fins 44 is 0.05 to 3 mm.

[0054] Specifically, the second fin 44 is at least one of a straight fin, a serrated fin, a corrugated fin, and a perforated fin.

[0055] In one embodiment, the liquid inlet 31 is connected to the outlet end of the cold side inlet diverter (not shown in the figure), the inlet end of the cold side inlet diverter is connected to a water inlet pipe, and the water inlet pipe is provided with a cold side inlet pressure gauge 5, a water flow meter 6 and a water pump 7; the steam outlet 32 ​​is connected to the inlet end of the cold side outlet merger (not shown in the figure), the outlet end of the cold side outlet merger is connected to a steam pipe, and the steam pipe is provided with a cold side outlet pressure gauge 8.

[0056] In one embodiment, the heating medium inlet 41 is connected to the outlet end of the hot side inlet diverter (not shown in the figure), and the inlet end of the hot side inlet diverter is connected to the heating medium input pipe, and the heating medium input pipe is provided with a hot side inlet pressure gauge, a heating medium flow meter and a delivery pump; the heating medium outlet 42 is connected to the inlet end of the hot side outlet merger (not shown in the figure), and the outlet end of the hot side outlet merger is connected to the heating medium output pipe.

[0057] It is understandable that the evaporation chamber 3 can be formed in the following manner: an evaporation groove is opened on the cold side 21 of the evaporation heat exchange plate 2, and the evaporation groove is combined with the adjacent partition 1 to form the evaporation chamber 3; the liquid inlet 31 and the steam outlet 32 ​​are opened on the two opposite side walls of the evaporation groove.

[0058] It can be understood that the heat exchange chamber 4 can be formed in the following manner: a heat exchange groove is opened on the hot side 22 of the evaporating heat exchange plate 2, and the heat exchange groove is combined with the adjacent partition 1 to form the heat exchange chamber 4; the heating medium inlet 41 and the heating medium outlet 42 are opened on the two opposite side walls of the heat exchange groove.

[0059] It is understandable that, in the present invention, a third porous medium layer may be provided between any two adjacent first fins 34 ; and, in the present invention, a fourth porous medium layer may be provided between any two adjacent second fins 44 .

[0060] The following examples are provided to facilitate understanding of the present invention. These examples are not provided to limit the scope of the claims.

[0061] Example 1

[0062] Referring to Figures 1 to 4, this embodiment provides a water vapor generator, including an evaporator shell 01. The interior of the evaporator shell 01 is hollow, and an evaporator core 02 is disposed in the evaporator shell 01. The evaporator core 02 includes a plurality of partitions 1 arranged in sequence, and an evaporation heat exchange plate 2 is disposed between any two adjacent partitions 1; the evaporation heat exchange plate 2 has a cold side 21 and a hot side 22 opposite to the cold side 21.

[0063] The cold side 21 of the evaporating heat exchange plate 2 is interconnected with the adjacent partition 1 to form an evaporation chamber 3. A liquid inlet 31 and a steam outlet 32 ​​are formed on the sidewall of the evaporation chamber 3. The evaporation chamber 3 consists of a liquid inlet area, an evaporation area, and a steam outflow area, which are arranged in sequence. The liquid inlet area is connected to the liquid inlet 31, and the steam outflow area is connected to the steam outlet 32. A first porous medium layer 33 and a first fin array are provided in the evaporation area, and the first fin array is located between the first porous medium layer 33 and the steam outflow area. The outer wall surface of the first porous medium layer 33 is tightly fitted with the inner wall surface of the evaporation area. A first gap 35 is left between the first porous medium layer 33 and the first fin array. The height of the first porous medium layer 33 is h1, the height of the first fin array is h2, and the height of the first gap 35 is h3. The total height of the evaporation area is h, and h1, h2, and h3 respectively satisfy the following conditions with h: h1 / h=0.5, h2 / h=0.4, and h3 / h=0.1.

[0064] The fin array is composed of a plurality of first fins 34 arranged in an array. The plurality of first fins 34 divide the evaporation zone into a plurality of flow channels. The height of the first fin 34 is the height of the first fin array, and the spacing between any two adjacent first fins 34 is 1 mm. The thickness of the first fin 34 is 0.5 mm. The first fin 34 extends along the height direction Z1 of the evaporation zone. The height of the first fin 34 (i.e., h2) is 20 mm. The first fin 34 is a straight fin.

[0065] In this embodiment, an evaporation groove is provided on the cold side 21 of the evaporation heat exchange plate 2. The evaporation groove and the adjacent partition plate 1 form an evaporation chamber 3. The liquid inlet 31 and the steam outlet 32 ​​are provided on two opposite side walls of the evaporation groove.

[0066] The hot side 22 of the evaporating heat exchange plate 2 is interconnected with the adjacent partition 1 to form a heat exchange chamber 4. A heat supply medium inlet 41 and a heat supply medium outlet 42 are provided on the side wall of the heat exchange chamber 4. A second porous medium layer 43 and a second fin array are provided in the heat exchange chamber 4. The heat supply medium inlet 41, the second porous medium layer 43, the second fin array and the heat supply medium outlet 42 are arranged in sequence. The outer wall surface of the second porous medium layer 43 is tightly matched with the inner wall surface of the heat exchange chamber 4. A second gap 45 is left between the second porous medium layer 43 and the second fin array. The height of the second porous medium layer 43 is H1, the height of the second fin array is H2, the height of the second gap 45 is H3, and the total height of the heat exchange chamber 4 is H. H1, H2 and H3 respectively satisfy H: H1 / H=0.5, H2 / H=0.4, H3 / H=0.1.

[0067] The second fin array is composed of a number of second fins 44 arranged in an array, and the number of second fins 44 divides the heat exchange chamber 4 into a number of flow channels. The height of the second fins 44 extends along the height direction of the heat exchange chamber 4, and the height of the second fins 44 is the height of the second fin array; the spacing between any two adjacent second fins 44 is 1 mm; the thickness of the second fins 44 is 0.5 mm, and the height of the second fins 44 (i.e., H2) is 20 mm. The second fins 44 are corrugated fins, and the angle between two adjacent corrugations on the corrugated fins is 30°. The corrugated fins are provided with a number of through holes, and the porosity of the through holes on the second fins 44 is 20%.

[0068] In this embodiment, a heat exchange groove is provided on the hot side 22 of the evaporating heat exchange plate 2. The heat exchange groove and the adjacent partition plate 1 are combined to form a heat exchange chamber 4. The heat supply medium inlet 41 and the heat supply medium outlet 42 are provided on two opposite side walls of the heat exchange groove.

[0069] In this embodiment, the first porous medium layer 33 and the second porous medium layer 43 are made of the same material, namely, foamed iron; the foamed iron has a porosity of 85% and a pore density of 70 ppi.

[0070] In this embodiment, the liquid inlet 31 is connected to a water inlet pipe that extends to the exterior of the evaporator housing 01 and is equipped with a cold-side inlet pressure gauge 5, a water flow meter 6, and a water pump 7. The steam outlet 32 ​​is connected to a steam pipe that extends to the exterior of the evaporator housing 01 and is equipped with a cold-side outlet pressure gauge 8. The liquid is water, and the steam is water vapor.

[0071] In this embodiment, the heating medium inlet 41 is connected to a heating medium input pipe, and the heating medium outlet 42 is connected to a heating medium outlet pipe.

[0072] Examples 2 to 5

[0073] Examples 2 to 5 provide a water vapor generator respectively. The differences between Examples 2 to 5 and Example 1 are:

[0074] In Example 2, the second fins 44 are not provided in the heat exchange chamber 4 , and the second porous medium layer 43 fills the heat exchange chamber 4 , that is, H1 / H=1.

[0075] In Example 3, H1, H2 and H3 respectively satisfy H: H1 / H=0.3, H2 / H=0.62, H3 / H=0.08.

[0076] In Example 4, H1, H2 and H3 respectively satisfy H: H1 / H=0.02, H2 / H=0.93, H3 / H=0.05.

[0077] In Example 5, the second porous medium layer 43 is not provided in the heat exchange chamber 4 , and the height of the second fins 44 is equal to the height of the heat exchange chamber 4 , that is, H2 / H=1.

[0078] Examples 6 to 10

[0079] Examples 6 to 10 each provide a water vapor generator.

[0080] The difference between Example 6 and Example 1 is that in Example 6, the first fin 34 is not provided in the evaporation chamber 3 , and the first porous medium layer 33 fills the evaporation chamber 3 , that is, h1 / h=1.

[0081] The difference between Example 7 and Example 6 is that in Example 7, no second fins 44 are provided in the heat exchange chamber 4, and the second porous medium layer 43 fills the heat exchange chamber 4, that is, H1 / H=1.

[0082] The difference between Example 8 and Example 6 is that in Example 8, H1, H2 and H3 respectively satisfy H: H1 / H=0.3, H2 / H=0.62, H3 / H=0.08.

[0083] The difference between Example 9 and Example 6 is that in Example 9, H1, H2 and H3 respectively satisfy H: H1 / H=0.02, H2 / H=0.93, H3 / H=0.05.

[0084] The difference between Example 10 and Example 6 is that in Example 10, the second porous medium layer 43 is not provided in the heat exchange chamber 4, and the height of the second fin 44 is equal to the height of the heat exchange chamber 4, that is, H2 / H=1.

[0085] Examples 11 to 15

[0086] Examples 11 to 15 each provide a water vapor generator.

[0087] The difference between Example 11 and Example 1 is that in Example 11, h1, h2 and h3 respectively satisfy h: h1 / h=0.3, h2 / h=0.62, h3 / h=0.08.

[0088] The difference between Example 12 and Example 11 is that in Example 12, no second fins 44 are provided in the heat exchange chamber 4, and the second porous medium layer 43 fills the heat exchange chamber 4, that is, H1 / H=1.

[0089] The difference between Example 13 and Example 11 is that in Example 13, H1, H2 and H3 respectively satisfy H: H1 / H=0.3, H2 / H=0.62, H3 / H=0.08.

[0090] The difference between Example 14 and Example 11 is that in Example 14, H1, H2 and H3 respectively satisfy H: H1 / H=0.02, H2 / H=0.93, H3 / H=0.05.

[0091] The difference between Example 15 and Example 11 is that in Example 15, the second porous medium layer 43 is not provided in the heat exchange chamber 4, and the height of the second fin 44 is equal to the height of the heat exchange chamber 4, that is, H2 / H=1.

[0092] Examples 16 to 20

[0093] Examples 16 to 20 provide a water vapor generator.

[0094] The difference between Example 16 and Example 1 is that in Example 16, h1, h2 and h3 respectively satisfy h: h1 / h=0.02, h2 / h=0.93, h3 / h=0.05.

[0095] The difference between Example 17 and Example 16 is that in Example 17, the second fins 44 are not provided in the heat exchange chamber 4, and the second porous medium layer 43 fills the heat exchange chamber 4, that is, H1 / H=1.

[0096] The difference between Example 18 and Example 16 is that in Example 18, H1, H2 and H3 respectively satisfy H: H1 / H=0.3, H2 / H=0.62, H3 / H=0.08.

[0097] The difference between Example 19 and Example 16 is that in Example 19, H1, H2 and H3 respectively satisfy H: H1 / H=0.02, H2 / H=0.93, H3 / H=0.05.

[0098] The difference between Example 20 and Example 16 is that in Example 20, the second porous medium layer 43 is not provided in the heat exchange chamber 4, and the height of the second fin 44 is equal to the height of the heat exchange chamber 4, that is, H2 / H=1.

[0099] Comparative Examples 1 to 5

[0100] Comparative Examples 1 to 5 respectively provide a water vapor generator. The difference between Comparative Examples 1 to 5 and Example 1 is that, in Comparative Examples 1 to 5, as shown in Figure 6, the first porous medium layer 33 is not provided in the evaporation chamber 3, and the height of the first fin 34 is equal to the total height of the evaporation zone, that is, h2 / h=1.

[0101] In comparative example 1, the second fins 44 are not provided in the heat exchange chamber 4 , and the second porous medium layer 43 fills the heat exchange chamber 4 , that is, H1 / H=1.

[0102] In Comparative Example 2, H1, H2 and H3 respectively satisfy H: H1 / H=0.5, H2 / H=0.4, H3 / H=0.1.

[0103] In Comparative Example 3, H1, H2 and H3 respectively satisfy the following with H: H1 / H=0.3, H2 / H=0.62, H3 / H=0.08.

[0104] In Comparative Example 4, H1, H2 and H3 respectively satisfy the following with H: H1 / H=0.02, H2 / H=0.93, H3 / H=0.05.

[0105] In comparative example 5, the second porous medium layer 43 is not provided in the heat exchange chamber 4, and the height of the second fins 44 is equal to the height of the heat exchange chamber 4, that is, H2 / H=1.

[0106] Effect Example 1

[0107] The steam generators of the above embodiment and comparative example were started and operated for 1 hour. The water inlet flow rate, water inlet pressure and steam outlet pressure of each steam generator were tested during the operation, as follows:

[0108] (1) Flow fluctuation amplitude: The water flow meter controls the average water flow rate to be the flow rate required by the working condition. The absolute value of the difference between the extreme value and the average value of the collected flow rate is the absolute fluctuation amplitude of the cold side flow rate. The absolute fluctuation amplitude / average value of the flow rate*100% is the relative fluctuation amplitude of the cold side flow rate. The qualified standard is: the relative fluctuation amplitude of the cold side flow rate ≤0.5%.

[0109] (2) Fluctuation amplitude of cold side inlet pressure: Use the cold side inlet pressure gauge to measure the average value and extreme value of the cold side inlet pressure. The absolute value of the difference between the extreme value and the average value is the absolute fluctuation amplitude of the cold side inlet pressure. The value of absolute fluctuation amplitude / average value*100% is the relative fluctuation amplitude of the cold side inlet pressure. The qualified standard is: relative fluctuation amplitude of cold side inlet pressure ≤5%.

[0110] (3) Fluctuation amplitude of cold side outlet pressure: Use the cold side outlet pressure gauge to measure the average value and extreme value of the cold side outlet pressure. The absolute value of the difference between the extreme value and the average value is the absolute fluctuation amplitude of the cold side outlet pressure. The value of absolute fluctuation amplitude / average value*100% is the relative fluctuation amplitude of the cold side outlet pressure. The qualified standard is: relative fluctuation amplitude of cold side outlet pressure ≤5%.

[0111] The test results are shown in Table 1 below.

[0112] Table 1

[0113] As can be seen from Table 1, in Examples 1 to 20 of the present invention, the proportional relationship between the height h1 of the first porous medium layer 33, the height h2 of the fin array, the height h3 of the first gap, and the total height h of the evaporation zone is optimized in the evaporation chamber 3, and the proportional relationship between the height H1 of the second porous medium layer 43, the height H2 of the fin structure, the height H3 of the second gap 45, and the total height H of the heat exchange chamber 4 is optimized in the heat exchange chamber 4. This allows the steam generator to stably discharge steam, with small fluctuations in the discharged steam flow rate and pressure, with a relative fluctuation amplitude of less than 0.5% in the cold side flow rate, a relative fluctuation amplitude of less than 5% in the cold side inlet pressure, and a relative fluctuation amplitude of less than 5% in the cold side outlet pressure.

[0114] It should be understood that, in the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features.

[0115] In the present invention, unless otherwise specified or limited, terms such as "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A steam generator, characterized in that: The evaporator shell comprises an evaporator core, the interior of the evaporator shell is hollow, the evaporator core is arranged in the evaporator shell, the evaporator core comprises a plurality of partitions arranged in sequence, an evaporation heat exchange plate is arranged between any two adjacent partitions, the evaporation heat exchange plate has a cold side and a hot side opposite to the cold side; the cold side of the evaporation heat exchange plate is interconnected with adjacent partitions to form an evaporation chamber; the evaporation chamber is provided with a liquid inlet and a steam outlet; the evaporation chamber is composed of a liquid inlet area, an evaporation area and a steam outflow area arranged in sequence, the liquid inlet area is connected with the liquid inlet, the steam outflow area is connected with the steam outlet, and a first porous medium layer is arranged in the evaporation area; the hot side of the evaporation heat exchange plate is interconnected with adjacent partitions to form a heat exchange chamber, and the heat exchange chamber is provided with a heat supply medium inlet and a heat supply medium outlet.

2. The water vapor generator according to claim 1, characterized in that: The height ratio of the first porous medium layer to the evaporation zone is (0.02-1):

1.

3. The water vapor generator according to claim 1, characterized in that: The material of the first porous medium layer is at least one of foam metal and foam ceramic.

4. The water vapor generator according to claim 1, characterized in that: The porosity of the first porous medium layer is not less than 85%; the pore density of the first porous medium layer is not greater than 200 ppi.

5. The water vapor generator according to claim 1, characterized in that: The evaporation zone is further provided with a first fin array, and the first fin array is located between the first porous medium layer and the steam outflow zone.

6. The water vapor generator according to claim 5, characterized in that The first fin array includes a plurality of first fins arranged in an array, and the first fins extend along a height direction of the evaporation region.

7. The water vapor generator according to claim 5, characterized in that: A first gap is left between the first fin array and the first porous medium layer, and a height ratio of the first gap to the evaporation zone is (0.05-0.1):

1.

8. The water vapor generator according to claim 1, characterized in that: At least one of a second porous medium layer and a second fin array is disposed in the heat exchange chamber.

9. The water vapor generator according to claim 1, characterized in that: The liquid inlet is connected to the outlet end of the cold side inlet diverter through a pipeline, the inlet end of the cold side inlet diverter is connected to a water inlet pipe, and the water inlet pipe is provided with a cold side inlet pressure gauge, a water flow meter and a water pump; the steam outlet is connected to the inlet end of the cold side outlet manifold through a pipeline, the outlet end of the cold side outlet manifold is connected to a steam pipe, and the steam pipe is provided with a cold side outlet pressure gauge.

10. The water vapor generator according to claim 1, characterized in that: The heating medium inlet is connected to the outlet end of the hot side inlet diverter through a pipeline, and the inlet end of the hot side inlet diverter is connected to a heating medium input pipe, and the heating medium input pipe is provided with a hot side inlet pressure gauge, a heating medium flow meter and a delivery pump; the heating medium outlet is connected to the inlet end of the hot side outlet merger through a pipeline, and the outlet end of the hot side outlet merger is connected to a heating medium output pipe.

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