Kettle type evaporator for fused salt steam generation system

Abstract

The invention relates to a kettle type evaporator for a fused salt steam generation system. The kettle type evaporator comprises a first tube box, a second tube box, an evaporation kettle, a tube plate, a central cylinder and a heat exchange tube, the left end and the right end of the evaporation kettle are respectively connected with a first channel and a second channel through tube plates, the first channel is provided with a fused salt inlet, the second channel is provided with a fused salt outlet, the bottom of the evaporation kettle is provided with a water inlet, and the top of the evaporation kettle is provided with a steam outlet; a central cylinder is arranged in the evaporation kettle, the two ends of the central cylinder are connected with the two tube plates respectively, a plurality of heat exchange tubes are spirally wound on the periphery of the central cylinder, and the two ends of each heat exchange tube are fixedly arranged on the two tube plates respectively and are communicated with the first tube box and the second tube box respectively. According to the heat exchange tube of the kettle type evaporator, due to the fact that the spiral wound tube type structure is adopted, the heat exchange tube is more resistant to heat strain impact and more suitable for variable working condition operation, and meanwhile the heat exchange coefficient is increased. In addition, the molten salt evaporator is not limited by the length of a straight heat exchange tube any more, and possibility is provided for large scale of the molten salt evaporator.

Description

Technical Field

[0001] The invention relates to the technical field of high-temperature thermal energy storage and conversion equipment, and in particular to a kettle evaporator for a molten salt steam generation system. Background Art

[0002] Whether molten salt energy storage is used for solar thermal power generation or thermal power peak regulation, the heat stored in the molten salt needs to be released to produce steam, which is inseparable from the molten salt steam generation system, and the molten salt evaporator is one of the key equipment.

[0003] Chinese patent document CN119289338A discloses a variable diameter U-shaped tube evaporator for a molten salt heat storage system, including a shell, a tube sheet, a tube box partition plate, a U-shaped heat exchange tube, a baffle and a drain port. The U-shaped heat exchange tube is fixed on the tube sheet, the tube sheet is connected to the tube box, and the tube box is fixedly connected to the shell through a flange. The U-shaped heat exchange tubes all adopt a variable diameter structure, and the diameter of the U-shaped heat exchange tube is large at the inlet section and small at the outlet section. The evaporator adopts a U-shaped heat exchange tube bundle design with a gradual change along the way. The variable tube diameter structure optimizes the flow rate and pressure distribution of the fluid in the tube, reduces the risk of local overheating and uneven evaporation, and effectively reduces the flow resistance. The variable tube diameter design also reduces the phenomenon of thermal stress concentration, thereby improving the reliability and service life of the equipment. The defects and shortcomings of the variable diameter U-tube evaporator are as follows: (1) When the U-shaped heat exchange tube generates thermal strain, it will exert a certain pulling force on the tube sheet, and its impact resistance is relatively weak; (2) Since the number of tube passes of the U-shaped heat exchange tube is an even number, the same tube sheet needs to withstand a large temperature difference between the inlet and the outlet, resulting in large thermal strain of the tube sheet, which can easily lead to leakage or damage of the evaporator; (3) The molten salt mainly transfers heat through the straight tube section in the U-shaped heat exchange tube, which is not conducive to the formation of turbulence, so the overall heat transfer coefficient is relatively low; (4) The variable diameter U-tube evaporator is restricted by the length of the straight tube section of the U-shaped tube, and the heat transfer area per cubic meter of volume is less than 100 square meters, which is not conducive to the large-scale equipment. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a kettle evaporator for a molten salt steam generation system, which solves the technical problem that the tube plate of the existing U-tube evaporator has weak impact resistance and is easy to be damaged and leaked.

[0006] (II) Technical solution

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] An embodiment of the present invention provides a kettle-type evaporator for a molten salt steam generation system, comprising a first pipe box, a second pipe box, an evaporation kettle, a tube sheet, a central tube and a heat exchange tube;

[0009] The left and right ends of the evaporator are connected to the first pipe box and the second pipe box through the tube sheet respectively. The first pipe box is provided with a molten salt inlet, the second pipe box is provided with a molten salt outlet, the bottom of the evaporator is provided with a water inlet, and the top of the evaporator is provided with a steam outlet;

[0010] A central tube is arranged inside the evaporator, and both ends of the central tube are respectively connected to two tube sheets. Multiple heat exchange tubes are spirally wound around the periphery of the central tube. Both ends of each heat exchange tube are respectively fixed on the two tube sheets and are respectively connected to the first tube box and the second tube box.

[0011] Optionally, the plurality of heat exchange tubes are divided into at least two groups, each group of heat exchange tubes constitutes a heat exchange tube bundle layer, and at least two heat exchange tube bundle layers are cylindrical structures and are sleeved together.

[0012] Optionally, it also includes a junction box and a plurality of electric heating tubes;

[0013] One end of the plurality of electric heating tubes is fixedly arranged on a tube sheet near one side of the first tube box, and the other end of the plurality of electric heating tubes passes through the evaporator, another tube sheet and the second tube box, and is connected to a junction box.

[0014] Optionally, a plurality of electric heating tubes are located between adjacent heat exchange tube bundle layers and are spaced apart along the circumference of the central tube.

[0015] Optionally, it further comprises a water inlet distribution pipe, the water inlet distribution pipe comprises a first pipe section and a second pipe section;

[0016] One end of the first pipe section is a water inlet, and the other end of the first pipe section enters the interior of the evaporator and is connected to the middle of the second pipe section. The length direction of the second pipe section is parallel to the length direction of the evaporator, and the pipe wall of the second pipe section is provided with water outlet holes at intervals along the length direction.

[0017] Optionally, a steam header is also included;

[0018] The top of the evaporator is provided with a plurality of steam outlets at intervals along the length direction, and the plurality of steam outlets are connected to a steam header through pipelines. A plug is provided at one end of the steam header, and the other end of the steam header is a total steam outlet.

[0019] Optionally, a demister is provided at the inner side wall of the evaporator corresponding to the steam outlet area.

[0020] Optionally, salt drainage ports are provided at the bottoms of the first pipe box and the second pipe box.

[0021] Optionally, a manhole is provided on the top of the evaporator, and a sealed door is provided at the manhole.

[0022] (III) Beneficial effects

[0023] The beneficial effects of the present invention are as follows: the kettle evaporator for the molten salt steam generation system of the present invention comprises a first pipe box, a second pipe box, an evaporating kettle, a tube sheet, a central tube and a heat exchange tube; the first pipe box is used to distribute the molten salt entering the evaporator; the tube sheet is used to separate the pipe box and the evaporating kettle into two fluid spaces and fix the heat exchange tube; the heat exchange tube is a channel for the molten salt to flow, and performs heat exchange between the molten salt and water; the evaporating kettle is a space for steam to separate vapor and liquid; the second pipe box is used to collect the molten salt flowing out of the heat exchange tube. During operation, the molten salt in the heat exchange tube releases heat, that is, the molten salt enters the first pipe box from the molten salt inlet, then enters a plurality of spirally arranged heat exchange tubes, enters the second pipe box through the heat exchange tube, and flows out of the kettle evaporator through the molten salt outlet. The water in the evaporating kettle absorbs heat and evaporates, that is, the water flows into the evaporating kettle from the water inlet, and under the heating action of the high-temperature molten salt, the water absorbs heat and undergoes a phase change, and the generated saturated steam flows out of the kettle evaporator through the steam outlet. Compared with the existing U-tube evaporator for molten salt steam generation system, first, the heat exchange tube adopts a spiral winding structure, which can absorb thermal strain in time and effectively, making the kettle evaporator of the present invention more suitable for the large temperature difference heat exchange condition of molten salt, and because the spiral heat exchange tube can eliminate its own thermal stress, it has strong impact resistance and is more adaptable to variable load conditions. This feature makes it more suitable for thermal power peak regulation in power plants. Second, the two sides of the evaporator adopt independent tube sheets, and there is no thermal strain caused by uneven temperature distribution of the tube sheet. At the same time, the pull-off force of the heat exchange tube on the tube sheet is also eliminated, which solves the problem of tube sheet leakage under large temperature difference heat exchange conditions. Third, because the heat exchange tube adopts a spiral winding structure, the flow direction of the molten salt in the heat exchange tube changes from time to time, which is easy to form turbulence and there is no dead zone, thereby greatly improving the heat transfer coefficient. Fourth, the heat exchange tube adopts a spiral winding structure, so that the length of the evaporator is no longer limited by the length of the straight section of the heat exchange tube, which is conducive to the large-scale equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of Example 1 of a kettle-type evaporator for a molten salt steam generating system of the present invention;

[0025] Figure 2 for Figure 1 An enlarged schematic diagram of a kettle evaporator for a molten salt steam generation system at position A;

[0026] Figure 3 for Figure 1 Schematic diagram of the cross section of the heat exchange tube

[0027] Figure 4 It is a schematic structural diagram of Example 2 of a kettle-type evaporator for a molten salt steam generating system of the present invention;

[0028] Figure 5 for Figure 4Schematic cross-sectional view of the heat exchange tubes and electric heating tubes.

[0029] [Description of Reference Numerals]

[0030] 1: first pipe box; 2: second pipe box; 3: evaporator; 4: tube sheet; 5: head; 6: molten salt inlet; 7: molten salt outlet; 8: salt outlet; 9: support; 10: steam outlet; 11: steam header; 12: plugging; 13: main steam outlet; 14: demister; 15: manhole; 16: water inlet distribution pipe; 17: first pipe section; 18: second pipe section; 19: water inlet; 21: center tube; 22: heat exchange tube; 23: gasket; 24: junction box; 25: electric heating tube. DETAILED DESCRIPTION

[0031] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below in conjunction with the accompanying drawings through specific embodiments. Figure 1 The orientation is used as a reference.

[0032] Embodiment 1:

[0033] Reference Figure 1 and Figure 2 This embodiment provides a kettle evaporator for a molten salt steam generation system, including a first pipe box 1, a second pipe box 2, an evaporation kettle 3, two tube sheets 4, a central tube 21 and a plurality of heat exchange tubes 22.

[0034] The left and right ends of the evaporator 3 are connected to the first pipe box 1 and the second pipe box 2 through the tube sheet 4 respectively. The first pipe box 1 is provided with a molten salt inlet 6, and the second pipe box 2 is provided with a molten salt outlet 7. The bottom of the evaporator 3 is provided with a water inlet 19, and the top of the evaporator 3 is provided with a steam outlet 10.

[0035] A central tube 21 is arranged inside the evaporator 3, and both ends of the central tube 21 are respectively connected to the two tube sheets 4. A plurality of heat exchange tubes 22 are spirally wound around the periphery of the central tube 21. Both ends of each heat exchange tube 22 are respectively fixedly arranged on the two tube sheets 4 and are respectively connected to the first tube box 1 and the second tube box 2.

[0036] The kettle evaporator for the molten salt steam generation system of this embodiment comprises a first pipe box 1, a second pipe box 2, an evaporator 3, two tube sheets 4, a central tube 21 and a plurality of heat exchange tubes 22. The first pipe box 1 distributes the molten salt entering the evaporator. The tube sheet 4 separates the pipe box and the evaporator 3 into two fluid spaces and fixes the ends of the heat exchange tubes 22. The middle of the heat exchange tubes 22 is spirally wound around the periphery of the central tube 21. The central tube 21 is used to fix and support the heat exchange tubes 22. The heat exchange tubes 22 are channels for the circulation of molten salt and perform heat exchange between molten salt and water. The evaporator 3 is a space for steam to separate vapor and liquid. The second pipe box 2 is used to collect the molten salt flowing out of the heat exchange tubes 22. During operation, the molten salt in the heat exchange tubes 22 releases heat, that is, the molten salt enters the first pipe box 1 from the molten salt inlet 6, then enters the plurality of spirally arranged heat exchange tubes 22, enters the second pipe box 2 through the heat exchange tubes 22, and flows out of the kettle evaporator through the molten salt outlet 7. The water in the evaporator 3 absorbs heat and evaporates, that is, the water flows into the evaporator 3 from the water inlet 19. Under the heating effect of the high-temperature molten salt, the water absorbs heat and undergoes a phase change, and the generated saturated steam flows out of the kettle evaporator through the steam outlet 10. Compared with the existing U-tube evaporator for the molten salt steam generation system, first, the heat exchange tube 22 adopts a spiral winding structure, which can absorb thermal strain in a timely and effective manner, making the kettle evaporator of this embodiment more suitable for the large temperature difference heat exchange condition of the molten salt, and because the spiral heat exchange tube 22 can eliminate its own thermal stress, it has strong impact resistance and is more adaptable to variable load conditions. This feature makes it more suitable for thermal power peak regulation in power plants. Second, the two sides of the evaporator 3 use independent tube sheets 4, and there is no thermal strain caused by uneven temperature distribution of the tube sheet 4. At the same time, the pulling force of the heat exchange tube 22 on the tube sheet 4 is also eliminated, which solves the problem of tube sheet leakage under large temperature difference heat exchange conditions. Third, since the heat exchange tube 22 adopts a spiral winding structure, the flow direction of the molten salt in the heat exchange tube 22 changes from time to time, which is easy to form turbulence, and there is no dead zone, which greatly improves the heat transfer coefficient. Fourth, the heat exchange tube 22 adopts a spiral winding structure, so that the length of the evaporator is no longer limited by the length of the straight tube section of the heat exchange tube 22, which is conducive to the large-scale equipment.

[0037] Please refer to Figure 3 Preferably, the plurality of heat exchange tubes 22 are divided into at least two groups, each group of heat exchange tubes 22 constitutes a heat exchange tube bundle layer, and at least two heat exchange tube bundle layers are cylindrical structures and are sleeved together. Pads 23 are arranged between adjacent heat exchange tube bundle layers, and the pads 23 are used to position and fix the heat exchange tubes 22. In addition, a pipe clamp is also arranged on the heat exchange tube 22, and a wrapping tube is arranged on the periphery of the heat exchange tube bundle layer. The pipe clamp is used to fix the position of the heat exchange tube 22, and the wrapping tube is a thin-walled cylinder wrapped on the outermost layer of the heat exchange tube bundle layer.

[0038] The heat exchange tube 22 of this embodiment is wrapped in layers by spiral winding, and has a compact structure. Compared with the existing U-tube heat exchanger, the heat exchange area per unit volume is significantly improved.

[0039] Preferably, the bottom of the first pipe box 1 and the second pipe box 2 are provided with a salt discharge port 8. The purpose of providing the salt discharge port 8 is to timely discharge the molten salt in the first pipe box 1, the second pipe box 2 and the heat exchange tube 22 when the kettle evaporator stops running, so as to prevent the molten salt from solidifying and blocking the heat exchange tube 22 due to heat loss.

[0040] Preferably, the kettle evaporator further comprises a water inlet distribution pipe 16, which comprises a first pipe section 17 and a second pipe section 18. One end of the first pipe section 17 is a water inlet 19, and the other end of the first pipe section 17 enters the interior of the evaporating kettle 3 and is connected to the middle of the second pipe section 18; the length direction of the second pipe section 18 is parallel to the length direction of the evaporating kettle 3, and the pipe wall of the second pipe section 18 is provided with water outlet holes at intervals along the length direction.

[0041] It should be noted that water flows into the first pipe section 17 of the water inlet distribution pipe 16 from the water inlet 19, and is then distributed to various positions outside the heat exchange tube 22 through multiple water outlet holes on the second pipe section 18, thereby maintaining a certain water level in the evaporator 3.

[0042] Preferably, the kettle evaporator further comprises a steam header 11. The top of the evaporator 3 is provided with a plurality of steam outlets 10 at intervals along the length direction, and the plurality of steam outlets 10 are connected to the steam header 11 through pipelines. A plug 12 is provided at one end of the steam header 11, and the other end of the steam header 11 is a steam main outlet 13. It should be noted that the top of the evaporator 3 is provided with a plurality of steam outlets 10 at intervals, and the steam enters the steam header 11 from the steam outlets 10, and then flows out of the kettle evaporator through the steam main outlet 13, the purpose of which is to allow the steam to be discharged from different positions of the evaporator 3, which can not only ensure uniform gas discharge, but also facilitate steam-water separation.

[0043] Furthermore, a demister 14 is provided on the inner wall of the evaporator 3 in the area corresponding to the steam outlet 10. The demister 14 is provided to further separate steam from water, thereby improving the steam dryness and thus the steam quality.

[0044] Furthermore, a support 9 is provided on the lower surface of the evaporating kettle 3 , and the support 9 is used to support the body of the evaporating kettle 3 .

[0045] Preferably, a head 5 is provided on a side of the first pipe box 1 and the second pipe box 2 away from the tube sheet 4 .

[0046] Furthermore, a manhole 15 is provided on the top of the evaporating kettle 3, and a closed door is provided at the manhole 15. It should be noted that the manhole 15 is provided to facilitate workers to enter the evaporating kettle 3 to maintain and repair the pipeline.

[0047] Embodiment 2:

[0048] Reference Figure 4 and Figure 5 This embodiment provides another kettle type evaporator for a molten salt steam generating system. Different from Embodiment 1, the kettle type evaporator of this embodiment further includes a junction box 24 and a plurality of electric heating tubes 25.

[0049] One end of the plurality of electric heating tubes 25 is fixedly arranged on the tube sheet 4 near the first tube box 1, and the other end of the plurality of electric heating tubes 25 passes through the evaporator 3, another tube sheet 4 and the second tube box 2 in sequence, and then is connected to the junction box 24. The function of the electric heating tubes 25 is to heat the heat exchange tubes 22 in the evaporator 3.

[0050] It should be noted that, due to the characteristic of molten salt, when the temperature is lower than its solidification point, it will solidify, thereby blocking the heat exchange tube. The heat exchange tube 22 adopts a spiral winding structure. Although it has the above advantages, the risk of pipeline blockage will increase due to the long flow path of the molten salt. To solve this problem, in this embodiment, multiple electric heating tubes 25 are arranged in the evaporator 3. The electric heating tubes 25 can heat the heat exchange tube 22. On the one hand, it can maintain the water temperature in the kettle. On the other hand, in case the molten salt solidifies, the molten salt can be melted to clear the heat exchange tube 22.

[0051] Preferably, the electric heating tubes 25 are located between adjacent heat exchange tube bundle layers and are arranged at intervals along the circumference of the central tube 21. The purpose of such arrangement is to make the electric heating tubes 25 contact the heat exchange tube bundle layers uniformly, and when the electric heating tubes 25 are started, the electric heating tubes 25 can quickly melt the solidified molten salt.

[0052] Preferably, the kettle evaporator of this embodiment further includes a controller and a temperature sensor. The controller is connected to the junction box 24 and the temperature sensor respectively, and the temperature sensor is arranged in the evaporating kettle 3 to monitor the water temperature in the evaporating kettle 3. When the kettle evaporator is working, the temperature sensor monitors the water temperature in the evaporating kettle 3 and sends the water temperature data to the controller; the controller determines whether the water temperature data is less than a preset value: if so, the controller starts a plurality of electric heating tubes 25 through the junction box 24. At the same time, if the molten salt solidifies and blocks the heat exchange tube 22, since the electric heating tube 25 is in direct contact with the heat exchange tube 22, the electric heating tube 25 can quickly melt the molten salt, thereby clearing the heat exchange tube 22.

[0053] The rest of the same points as in Example 1 will not be repeated here.

[0054] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the present invention, unless otherwise clearly specified and limited, when a first feature is “on” or “below” a second feature, it may be that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, when a first feature is “above”, “above” or “above” a second feature, it may be that the first feature is directly above or obliquely above the second feature, or it may simply mean that the first feature is higher in level than the second feature. When a first feature is “below”, “below” or “below” a second feature, it may be that the first feature is directly below or obliquely below the second feature, or it may simply mean that the first feature is lower in level than the second feature.

[0057] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "embodiment", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0058] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A kettle evaporator for a molten salt steam generation system, characterized in that: It comprises a first pipe box (1), a second pipe box (2), an evaporator (3), a tube sheet (4), a central tube (21) and a heat exchange tube (22); The left and right ends of the evaporator (3) are respectively connected to a first pipe box (1) and a second pipe box (2) through a tube sheet (4); the first pipe box (1) is provided with a molten salt inlet (6); the second pipe box (2) is provided with a molten salt outlet (7); the bottom of the evaporator (3) is provided with a water inlet (19); and the top of the evaporator (3) is provided with a steam outlet (10); A central tube (21) is arranged inside the evaporator (3), and two ends of the central tube (21) are respectively connected to two tube sheets (4), and a plurality of heat exchange tubes (22) are spirally wound around the periphery of the central tube (21), and two ends of the heat exchange tubes (22) are respectively fixedly arranged on the two tube sheets (4) and are respectively connected to the first tube box (1) and the second tube box (2).

2. The kettle evaporator for a molten salt steam generation system according to claim 1, characterized in that: The plurality of heat exchange tubes (22) are divided into at least two groups, each group of heat exchange tubes (22) constitutes a heat exchange tube bundle layer, and at least two heat exchange tube bundle layers are cylindrical structures and are sleeved together.

3. The kettle evaporator for a molten salt steam generation system according to claim 2, characterized in that: It also includes a junction box (24) and a plurality of electric heating tubes (25); One end of the plurality of electric heating tubes (25) is fixedly arranged on a tube sheet (4) close to one side of the first tube box (1), and the other end of the plurality of electric heating tubes (25) passes through the evaporator (3), another tube sheet (4) and the second tube box (2), and is then connected to a junction box (24).

4. The kettle evaporator for a molten salt steam generation system according to claim 3, characterized in that: A plurality of electric heating tubes (25) are located between adjacent heat exchange tube bundle layers and are arranged at intervals along the circumference of the central tube (21).

5. The kettle evaporator for a molten salt steam generation system according to claim 1, characterized in that: It also includes a water inlet distribution pipe (16), wherein the water inlet distribution pipe (16) includes a first pipe section (17) and a second pipe section (18); One end of the first pipe section (17) is a water inlet (19), the other end of the first pipe section (17) enters the interior of the evaporating pot (3) and is connected to the middle of the second pipe section (18), the length direction of the second pipe section (18) is parallel to the length direction of the evaporating pot (3), and the pipe wall of the second pipe section (18) is provided with water outlet holes at intervals along the length direction.

6. The kettle evaporator for a molten salt steam generation system according to claim 1, characterized in that: Also includes a steam header (11); A plurality of steam outlets (10) are provided at intervals along the length direction on the top of the evaporator (3); the plurality of steam outlets (10) are connected to a steam header (11) through pipelines; a plug (12) is provided at one end of the steam header (11); and a total steam outlet (13) is provided at the other end of the steam header (11).

7. The kettle evaporator for a molten salt steam generation system according to claim 6, characterized in that: A demister (14) is provided on the inner side wall of the evaporating kettle (3) in a region corresponding to the steam outlet (10).

8. The kettle evaporator for a molten salt steam generation system according to claim 1, characterized in that: The bottoms of the first pipe box (1) and the second pipe box (2) are provided with salt drainage ports (8).

9. The kettle evaporator for a molten salt steam generation system according to claim 1, characterized in that: A manhole (15) is provided on the top of the evaporating kettle (3), and a sealed door is provided on the manhole (15).

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