A water vapor generator

Abstract

The present application relates to a kind of water vapor generator.The water vapor generator includes evaporator shell and evaporative core, the evaporative core includes several sequentially arranged partitions, evaporative heat exchange plate is provided between any two adjacent partitions, the evaporative heat exchange plate has cold side and hot side;The cold side of the evaporative heat exchange plate and adjacent partition are mutually connected to form evaporative chamber;First porous medium layer is provided in the evaporation zone of the evaporative chamber;The hot side of the evaporative heat exchange plate and adjacent partition are mutually connected to form heat exchange chamber.The present application is provided with first porous medium layer in evaporative chamber, and heat medium enters heat exchange chamber, to heat supply to evaporative chamber;Liquid is evaporated to produce steam after being heated when entering evaporative chamber, and the setting of first porous medium layer can inhibit the liquid flowing through first porous medium layer to produce large bubbles, so that water vapor generator can stably discharge steam, and the discharged steam flow and pressure fluctuation are small.

Description

Technical Field

[0001] This invention relates to the field of fuel cell technology, and more particularly to a steam generator. Background Technology

[0002] Water vapor plays a crucial role in solid oxide fuel cell power generation systems, primarily in the following ways: (1) the ratio of water vapor to carbon in the gas flow entering the reformer is a key influencing factor on the reforming reaction; (2) a stable ratio of water vapor to carbon in the fuel gas flow entering the fuel cell can prevent carbon deposition and extend the lifespan of the solid oxide fuel cell power generation system; and (3) the pressure and flow rate of water vapor affect the changes in combustion components in the downstream burner, impacting the stable operation of the burner. Therefore, maintaining a stable steam flow rate and precisely controlling the ratio of water vapor to carbon are important considerations in the design of the water vapor generator in a solid oxide fuel cell power generation system.

[0003] Existing steam generators include electrically heated and convective heat transfer types. Electrically heated steam generators suffer from uneven heat transfer, therefore convective heat transfer steam generators are more commonly used in solid oxide fuel cell power generation systems. However, existing convective heat transfer steam generators typically have finned structures on both the cold and hot sides. During the boiling process of liquid water, the liquid water on the cold side undergoes a phase change, continuously generating bubbles at the vaporization core of the hot wall. The generation and collapse of these bubbles cause pressure and flow fluctuations, leading to unstable steam emissions from the steam generator, characterized by large fluctuations in both flow rate and pressure.

[0004] Therefore, it is essential to design a steam generator capable of stably discharging steam. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a steam generator capable of stably emitting steam.

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

[0007] A steam generator includes an evaporator shell and an evaporator core. The evaporator shell is hollow, and the evaporator core is disposed inside the evaporator shell. The evaporator core includes a plurality of sequentially arranged partitions, and an evaporation heat exchange plate is disposed 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 connected to the adjacent partitions to form an evaporation chamber. The evaporation chamber has a liquid inlet and a steam outlet. The evaporation chamber is composed of a liquid inflow zone, an evaporation zone, and a steam outflow zone arranged sequentially. The liquid inflow zone is connected to the liquid inlet, and the steam outflow zone is connected to the steam outlet. A first porous medium layer is disposed in the evaporation zone. The hot side of the evaporation heat exchange plate is connected to the adjacent partitions to form a heat exchange chamber, and the heat exchange chamber has a heating medium inlet and a heating medium outlet.

[0008] The steam generator of the present invention forms an evaporation chamber by connecting the cold side of the evaporation heat exchange plate to the adjacent partition, and forms a heat exchange chamber by connecting the hot side of the evaporation heat exchange plate to the adjacent partition. The heating medium enters the heat exchange chamber and is conducted through the evaporation heat exchange plate to heat the evaporation chamber. After entering the evaporation chamber, the liquid is heated and evaporated to generate steam. The present invention provides a first porous medium layer in the evaporation zone. The first porous medium layer can suppress the generation of large bubbles by the evaporation of the liquid flowing through the first porous medium layer, thereby enabling the steam generator to stably discharge steam and making the discharge steam flow and pressure fluctuations small.

[0009] In this invention, preferably, the outer wall surface of the first porous medium layer is in close contact with the inner wall surface of the evaporation zone.

[0010] In 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] In 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] In 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] In a preferred embodiment of the present invention, the evaporation zone is further provided with a fin array, which is located between the first porous medium layer and the steam outflow zone.

[0015] Furthermore, the 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 being 2 to 40 mm, the thickness of the first fins being 0.05 to 3 mm, and the spacing between any two adjacent first fins being 0.5 to 5 mm.

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

[0017] The inventors discovered that leaving a gap between the fin array and the first porous medium layer allows the steam escaping from the pores of the first porous medium layer to mix in the gap, ensuring that the steam flowing towards the fin array area has the same temperature and flow rate. This avoids the formation of a temperature gradient on the surface of the fin array, which would generate thermal stress and thus prevent deformation damage to the fins.

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

[0019] In a preferred embodiment of the present invention, the liquid inlet is connected to the outlet end of the cold-side inlet distributor, the inlet end of the cold-side inlet distributor is connected to a water inlet pipe, and the water inlet pipe is equipped 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 equipped with a cold-side outlet pressure gauge.

[0020] In a preferred embodiment of the present invention, the heating medium inlet is connected to the outlet end of the heat-side inlet distributor, the inlet end of the heat-side inlet distributor is connected to a heating medium input pipe, and the heating medium input pipe is equipped with a heat-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 heat-side outlet manifold, and the outlet end of the heat-side outlet manifold is connected to a heating medium output pipe.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The steam generator of this invention forms an evaporation chamber by connecting the cold side of the evaporation heat exchange plate to an adjacent partition, and a heat exchange chamber by connecting the hot side of the evaporation heat exchange plate to an adjacent partition. The heating medium enters the heat exchange chamber and is conducted through the evaporation heat exchange plate to heat the evaporation chamber. After entering the evaporation chamber, the liquid is heated and evaporates to generate steam. This invention provides a first porous medium layer in the evaporation zone. The first porous medium layer can suppress the generation of large bubbles by the evaporation of the liquid flowing through the first porous medium layer, thereby enabling the steam generator to stably discharge steam with small fluctuations in the discharge steam flow rate and pressure. The steam generator provided by this invention is suitable for solid oxide fuel cell power generation systems. Attached Figure Description

[0023] Figure 1 A schematic diagram of the structure of the steam generator provided by the present invention;

[0024] Figure 2 This is a front view of the core provided by the present invention;

[0025] Figure 3 This is a cold side sectional view of an evaporative heat exchange plate provided according to an embodiment of the present invention;

[0026] Figure 4 This is a thermal sectional view of an evaporative heat exchange plate provided in one embodiment of the present invention;

[0027] Figure 5 A cold side sectional view of an evaporative heat exchange plate provided in another embodiment of the present invention;

[0028] Figure 6 This is a cold side sectional view of the evaporative heat exchange plate provided as a comparative example of the present invention;

[0029] Figure 7 A thermal sectional view of an evaporative heat exchange plate provided in another embodiment of the present invention;

[0030] Figure 8 This is a thermal sectional view of an evaporative heat exchange plate provided in another embodiment of the present invention.

[0031] In the figure, 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 media layer, 34-first fin, 35-first gap, 4-heat exchange chamber, 41-heating medium inlet, 42-heating medium outlet, 43-second porous media 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 Implementation

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

[0033] Please see Figures 1-8 This invention provides a steam generator, comprising an evaporator shell and an evaporator core. The evaporator shell is hollow, and the evaporator core is disposed within the evaporator shell. The evaporator core includes a plurality of sequentially arranged partitions 1, 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. The cold side 21 of the evaporation heat exchange plate 2 is interconnected with the adjacent partitions 1 to form an evaporation chamber 3. The evaporation chamber 3 has a liquid inlet 31 and a steam outlet 32. The evaporation chamber 3 is composed of a liquid inflow area, an evaporation area, and a steam outflow area arranged sequentially. The liquid inflow 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 is disposed in the evaporation area. The hot side 22 of the evaporation heat exchange plate 2 is interconnected with the adjacent partitions 1 to form a heat exchange chamber 4. The heat exchange chamber 4 has a heating medium inlet and a heating medium outlet.

[0034] The heating medium enters the heat exchange chamber 4 and is conducted through the evaporation heat exchange plate 2 to heat the evaporation chamber 3. After entering the evaporation chamber 3, the liquid is heated and evaporated to generate steam. The present invention provides a first porous medium layer 33 in the evaporation zone. The first porous medium layer 33 can suppress the generation of large bubbles by the evaporation of the liquid flowing through the first porous medium layer 33, thereby enabling the steam generator to stably discharge steam and making the discharge steam flow and pressure fluctuations small.

[0035] In one embodiment, the outer wall surface of the first porous medium layer 33 is in close contact 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 to 1):1. When the height ratio of the first porous medium layer 33 to the evaporation zone is 1:1, it means that the first porous medium layer 33 fills the entire evaporation zone.

[0037] In one embodiment, the first porous medium layer 33 is made of 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 first porous medium layer 33 is preferably made of 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 discovered that if the porosity of the first porous media layer 33 is less than 85%, it will result in excessive pressure loss in the area where the first porous media layer is located, which will make it difficult for water to flow into the evaporator; if the pore density of each porous media layer is greater than 200 ppi, it will result in insufficient strength of the corresponding media layer, which will make the evaporator prone to deformation.

[0041] In one embodiment, the evaporation zone is further provided with a fin array, which is located between the first porous medium layer 33 and the steam outflow zone; the 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 spacing between any two adjacent first fins 34 is 0.5 to 5 mm; the first fins 34 extend along the height direction of the evaporation zone, the height of the first fins 34 is 2 to 40 mm, and the thickness of the first fins 34 is 0.05 to 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 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 fin array to the evaporation zone is (0.4~0.93):1.

[0045] The inventors discovered that leaving a gap between the fin array and the first porous medium layer 33 allows the steam escaping from the pores of the first porous medium layer 33 to mix in the gap, so that the steam flowing to the area where the fin array is located has the same temperature and flow rate, avoiding the formation of a temperature gradient on the surface of the fin array and thus avoiding thermal stress, thereby preventing deformation damage to the fins.

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

[0047] Specifically, a second porous medium layer 43 is provided inside the heat exchange chamber 4, and the outer wall surface of the second porous medium layer 43 is in close contact 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, the heat exchange chamber 4 is equipped with a finned structure, and the height ratio of the finned structure to the heat exchange chamber 4 is (0.4~1):1.

[0049] Specifically, a second porous medium layer 43 and a fin structure are provided inside the heat exchange chamber 4. The outer wall surface of the second porous medium layer 43 is tightly fitted with the inner wall surface of the heat exchange chamber 4. The heating medium inlet 41, the second porous medium layer 43, the fin structure 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 fin structure. 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 fin structure 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 to 80 ppi.

[0053] Specifically, the fin structure 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 of the heat exchange chamber 4, and the height of the second fins 44 is the height of the fin structure; 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 a cold-side inlet distributor (not shown in the figure), the inlet end of which is connected to a water inlet pipe, and a cold-side inlet pressure gauge 5, a water flow meter 6, and a water pump 7 are installed on the water inlet pipe; the steam outlet 32 ​​is connected to the inlet end of a cold-side outlet manifold (not shown in the figure), the outlet end of which is connected to a steam pipe, and a cold-side outlet pressure gauge 8 is installed on the steam pipe.

[0056] In one embodiment, the heating medium inlet 41 is connected to the outlet end of the heat-side inlet distributor, the inlet end of the heat-side inlet distributor is connected to a heating medium input pipe, and the heating medium input pipe is equipped with a heat-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 heat-side outlet manifold, and the outlet end of the heat-side outlet manifold is connected to a heating medium output pipe.

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

[0058] It is 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 evaporation heat exchange plate 2, and the heat exchange groove is combined with the adjacent partition plate 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 understood that the present invention may also provide a third porous medium layer between any two adjacent first fins 34; the present invention may also provide a fourth porous medium layer between any two adjacent second fins 44.

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

[0061] Example 1

[0062] Please see Figures 1-4 This embodiment provides a steam generator, including an evaporator shell, the interior of which is hollow, and an evaporation core is provided inside the evaporator shell. The evaporation core includes a plurality of partitions 1 arranged in sequence, and an evaporation heat exchange plate 2 is provided 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 evaporation heat exchange plate 2 is connected to the adjacent partition plate 1 to form an evaporation chamber 3. The side wall of 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 inflow area, an evaporation area and a steam outflow area arranged in sequence. The liquid inflow 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 fin array are provided in the evaporation area. The first fin 34 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 in close contact with the inner wall surface of the evaporation area. A first gap 35 is left between the first porous medium layer 33 and the fin array. The height of the first porous medium layer 33 is h1, the height of the fin array is h2, the height of the first gap 35 is h3, and the total height of the evaporation area is h. h, h1, h2 and h3 satisfy: h1 / h = 0.5, h2 / h = 0.4, 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 fins 34 is the height of the fin array. The distance between any two adjacent first fins 34 is 1 mm. The thickness of the first fins 34 is 0.5 mm. The first fins 34 extend along the height direction of the evaporation zone. The height (i.e., h2) of the first fins 34 is 20 mm. The first fins 34 are straight fins.

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

[0066] The hot side 22 of the evaporative heat exchange plate 2 is connected to the adjacent partition plate 1 to form a heat exchange chamber 4. The side wall of the heat exchange chamber 4 is provided with a heating medium inlet 41 and a heating medium outlet 42. A second porous medium layer 43 and a fin structure are provided in the heat exchange chamber 4. The heating medium inlet 41, the second porous medium layer 43, the fin structure and the heating medium outlet 42 are arranged in sequence. The outer wall surface of the second porous medium layer 43 is in close contact 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 fin structure. The height of the second porous medium layer 43 is H1, the height of the fin structure is H2, the height of the second gap 45 is H3, and the total height of the heat exchange chamber 4 is H. H, H1, H2 and H3 satisfy: H1 / H = 0.5, H2 / H = 0.4, H3 / H = 0.1.

[0067] The fin structure consists of several arrayed second fins 44, which divide the heat exchange chamber 4 into several 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 fin structure. The spacing between any two adjacent second fins 44 is 1 mm. The thickness of the second fin 44 is 0.5 mm, and the height (H2) of the second fin 44 is 20 mm. The second fin 44 is a corrugated fin, and the included angle between two adjacent corrugations on the corrugated fin is 30°. Several through holes are opened on the corrugated fin, and the opening rate of the through holes on the second fin 44 is 20%.

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

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

[0070] In this embodiment, the liquid inlet 31 is connected to a water inlet pipe that extends to the outside of the water evaporator shell. The water inlet pipe 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 outside of the water evaporator shell. The steam pipe is equipped with a cold-side outlet pressure gauge 8.

[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 2-5

[0073] Examples 2-5 each provide a steam generator. The difference between Examples 2-5 and Example 1 is that:

[0074] In Example 2, 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, i.e., H1 / H = 1.

[0075] In Example 3, H, H1, H2, and H3 satisfy the following values: H1 / H = 0.3, H2 / H = 0.62, and H3 / H = 0.08. In Example 4, H, H1, H2, and H3 satisfy the following values: H1 / H = 0.02, H2 / H = 0.93, and H3 / H = 0.05.

[0076] In embodiment 5, 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.

[0077] Examples 6-10

[0078] Examples 6 to 10 each provide a steam generator.

[0079] 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.

[0080] The difference between Example 7 and Example 6 is that in Example 7, the second fin 44 is 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.

[0081] The difference between Example 8 and Example 6 is that in Example 8, H, H1, H2 and H3 satisfy: H1 / H = 0.3, H2 / H = 0.62, H3 / H = 0.08.

[0082] The difference between Example 9 and Example 6 is that in Example 9, H, H1, H2 and H3 satisfy: H1 / H = 0.02, H2 / H = 0.93, H3 / H = 0.05.

[0083] 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.

[0084] Examples 11-15

[0085] Examples 11 to 15 each provide a steam generator.

[0086] The difference between Example 11 and Example 1 is that in Example 11, h, h1, h2 and h3 satisfy: h1 / h = 0.3, h2 / h = 0.62, h3 / h = 0.08.

[0087] The difference between Example 12 and Example 11 is that in Example 12, the second fin 44 is 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.

[0088] The difference between Example 13 and Example 11 is that in Example 13, H, H1, H2 and H3 satisfy: H1 / H = 0.3, H2 / H = 0.62, H3 / H = 0.08.

[0089] The difference between Example 14 and Example 11 is that in Example 14, H, H1, H2 and H3 satisfy: H1 / H = 0.02, H2 / H = 0.93, H3 / H = 0.05.

[0090] 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.

[0091] Examples 16-20

[0092] Examples 16-20 provide a steam generator.

[0093] The difference between Example 16 and Example 1 is that in Example 16, h, h1, h2 and h3 satisfy: h1 / h = 0.02, h2 / h = 0.93, h3 / h = 0.05.

[0094] The difference between Example 17 and Example 16 is that in Example 17, the second fin 44 is 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.

[0095] The difference between Example 18 and Example 16 is that in Example 18, H, H1, H2 and H3 satisfy: H1 / H = 0.3, H2 / H = 0.62, H3 / H = 0.08.

[0096] The difference between Example 19 and Example 16 is that in Example 19, H, H1, H2 and H3 satisfy: H1 / H = 0.02, H2 / H = 0.93, H3 / H = 0.05.

[0097] 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.

[0098] Comparative Examples 1-5

[0099] Comparative Examples 1-5 each provide a steam generator. The difference between Comparative Examples 1-5 and Example 1 is that, in Comparative Examples 1-5, as... Figure 6 As shown, 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, i.e., h2 / h=1.

[0100] In Comparative Example 1, 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, i.e., H1 / H = 1.

[0101] In Comparative Example 2, H, H1, H2, and H3 satisfy the following conditions: H1 / H = 0.5, H2 / H = 0.4, and H3 / H = 0.1.

[0102] In Comparative Example 3, H, H1, H2, and H3 satisfy the following conditions: H1 / H = 0.3, H2 / H = 0.62, and H3 / H = 0.08. In Comparative Example 4, H, H1, H2, and H3 satisfy the following conditions: H1 / H = 0.02, H2 / H = 0.93, and H3 / H = 0.05.

[0103] In Comparative Example 5, no second porous medium layer 43 is 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, i.e., H2 / H = 1.

[0104] Example of effect 1

[0105] The steam generators of the above embodiments and comparative examples were started and operated for 1 hour. During the operation, the inlet water flow rate, inlet water pressure, and steam outlet pressure of each steam generator were tested as follows:

[0106] (1) Flow fluctuation range: The average flow rate controlled by the water flow meter is the flow rate required under working conditions. The absolute value of the difference between the extreme value and the average value of the flow rate is the absolute fluctuation range of the cold side flow rate. The absolute fluctuation range / the average value of the flow rate * 100% is the relative fluctuation range of the cold side flow rate. The qualified standard is: the relative fluctuation range of the cold side flow rate ≤ 0.5%.

[0107] (2) Fluctuation of cold side inlet pressure: The average value and extreme value of cold side inlet pressure are measured by using a cold side inlet pressure gauge. The absolute value of the difference between the extreme value and the average value is the absolute fluctuation of cold side inlet pressure. The absolute fluctuation of cold side inlet pressure / average value * 100% is the relative fluctuation of cold side inlet pressure. The qualified standard is: the relative fluctuation of cold side inlet pressure ≤ 5%.

[0108] (3) Cold side outlet pressure fluctuation range: The average value and extreme value of the cold side outlet pressure are measured using a cold side outlet pressure gauge. The absolute value of the difference between the extreme value and the average value is the absolute fluctuation range of the cold side outlet pressure. The ratio of the absolute fluctuation range / the average value * 100% is the relative fluctuation range of the cold side outlet pressure. The standard is: the relative fluctuation range of the cold side outlet pressure ≤ 5%.

[0109] The test results are shown in Table 1 below.

[0110] Table 1

[0111]

[0112] As shown in Table 1, embodiments 1-20 of the present invention optimize 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 in the evaporation chamber 3, and optimize 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. This enables the steam generator to stably discharge steam, resulting in small fluctuations in the discharged steam flow rate and pressure, with a relative fluctuation of less than 0.5% in the cold side flow rate, a relative fluctuation of less than 5% in the cold side inlet pressure, and a relative fluctuation of less than 5% in the cold side outlet pressure.

[0113] It should be understood that in the description of this 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 indicated technical features. Therefore, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature.

[0114] In this invention, unless otherwise explicitly specified and limited, the terms "set up," "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of a structure. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0115] 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 modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A water vapor generator characterized by, The device includes an evaporator shell and an evaporator core. The evaporator shell is hollow, and the evaporator core is disposed inside the evaporator shell. The evaporator core includes several sequentially arranged partitions, and an evaporator heat exchange plate is disposed between any two adjacent partitions. The evaporator heat exchange plate has a cold side and a hot side opposite to the cold side. The cold side of the evaporator heat exchange plate is connected to the adjacent partitions to form an evaporation chamber. The evaporation chamber has a liquid inlet and a steam outlet. The evaporation chamber consists of a liquid inflow area, an evaporation area, and a steam outflow area arranged sequentially. The liquid inflow area is connected to the liquid inlet, and the steam outflow area is connected to the steam outlet. A first porous medium layer is disposed in the evaporation area. The hot side of the evaporator heat exchange plate is connected to the adjacent partitions to form a heat exchange chamber, and the heat exchange chamber has a heating medium inlet and a heating medium outlet. The evaporation zone is also provided with a fin array, which is located between the first porous medium layer and the steam outflow zone, with a first gap between the fin array and the first porous medium layer.

2. The steam generator as described in claim 1, characterized in that, The material of the first porous medium layer is at least one of foam metal and foam ceramic.

3. The water vapor generator of claim 1, wherein, 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.

4. The water vapor generator of claim 1, wherein, The fin array includes a plurality of first fins arranged in an array, the first fins extending along the height direction of the evaporation zone.

5. The steam generator as described in claim 1, characterized in that, The height ratio of the first gap to the evaporation zone is (0.05~0.1):

1.

6. The steam generator as described in claim 1, characterized in that, The heat exchange chamber is provided with at least one of the following structures: a second porous medium layer and a fin structure.

7. The water vapor generator of claim 1, wherein, The liquid inlet is connected to the outlet end of the cold-side inlet distributor via a pipe. The inlet end of the cold-side inlet distributor is connected to a water inlet pipe, and the water inlet pipe is equipped 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 via a pipe. The outlet end of the cold-side outlet manifold is connected to a steam pipe, and the steam pipe is equipped with a cold-side outlet pressure gauge.

8. The water vapor generator of claim 1, wherein, The heating medium inlet is connected to the outlet end of the heat-side inlet distributor via a pipeline. The inlet end of the heat-side inlet distributor is connected to a heating medium input pipe. The heating medium input pipe is equipped with a heat-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 heat-side outlet manifold via a pipeline. The outlet end of the heat-side outlet manifold is connected to a heating medium output pipe.

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