Steam generator with reduced steam temperature difference

Abstract

The application relates to a steam generator capable of reducing steam temperature difference, which comprises a shell, a containing chamber, a heat source inlet, a heat source outlet, a feed water inlet and a steam outlet, the heat source inlet, the heat source outlet, the feed water inlet and the steam outlet are arranged on the shell and are communicated with the containing chamber; a plurality of heat exchange assemblies are arranged in the containing chamber; a plurality of feed water assemblies are arranged on one end of the shell and are communicated with at least one heat exchange assembly; a steam output assembly is arranged on the steam outlet and is connected with the heat exchange assembly; and a plurality of adjusting assemblies are arranged on each feed water assembly and are used for adjusting the feed water flow in the corresponding feed water assembly. In this way, the temperature of the steam output by the heat exchange assembly can be adjusted, the steam temperature of each heat exchange assembly delivered to the steam output assembly is balanced, the steam temperature difference is reduced, the steam yield and quality are ensured, and thermal stress can be avoided, so that the use performance of the steam generator is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steam generation equipment, in particular to a steam generator capable of reducing steam temperature difference. BACKGROUND

[0002] The once-through steam generator can directly generate superheated steam, super-high pressure steam and supercritical parameter steam, which brings higher power generation efficiency, and has compact structure, so it is widely used in nuclear power generation and power field. The main design of the once-through steam generator is divided into two types, one is integrated large spiral pipe type design, and the other is split modular design.

[0003] For the split modular steam generator, the main advantage is that the internal modules can be produced in batches, the cost is low, and each module can carry out out-of-pile hot state verification test, which ensures the uniformity of steam temperature to a certain extent, becomes a better type of once-through steam generator, and is convenient for popularization and application of the steam generator.

[0004] Generally, the split modular steam generator has a plurality of heat exchange modules, each of which can independently carry out heat exchange and generate steam. However, under actual service conditions, different modules are affected by various factors, steam is generated in sequence, and there is a difference in resistance along the way in the module, so that the water flow distribution in different modules is uneven and uncontrollable, which affects the yield and quality of steam. Moreover, the difference in water flow distribution between the modules makes the temperature difference on the steam tube plate larger, generates larger thermal stress, and affects the use performance of the steam generator. SUMMARY

[0005] Therefore, it is necessary to provide a steam generator capable of reducing steam temperature difference, ensuring uniform steam temperature and thus ensuring steam yield and quality, in view of the problem of large steam tube plate temperature difference in the current steam generator.

[0006] A steam generator capable of reducing steam temperature difference, comprising:

[0007] An outer shell having a hollow containing chamber and a heat source inlet, a heat source outlet, a water inlet and a steam outlet, the heat source inlet, the heat source outlet, the water inlet and the steam outlet being arranged in the outer shell and respectively communicating with the containing chamber;

[0008] A plurality of heat exchange components arranged in the containing chamber;

[0009] A plurality of water supply components located outside the outer shell, one end of the water supply component penetrating the water inlet of the outer shell and communicating with at least one heat exchange component;

[0010] A steam output component arranged in the steam outlet and connected with the heat exchange component.

[0011] a plurality of adjusting components, each of the adjusting components corresponding to one of the water supply components, for adjusting water flow in the corresponding water supply component.

[0012] In an embodiment of the present application, the adjusting component comprises a flow valve, which is arranged in the water supply component, and the opening degree of the flow valve is adjusted to adjust the water flow in the water supply component.

[0013] In an embodiment of the present application, the adjusting component further comprises a temperature measuring element, which is arranged in the steam output component, for detecting the actual temperature of the steam output by the corresponding heat exchange component.

[0014] In an embodiment of the present application, the steam generator capable of reducing steam temperature difference further comprises a controller, which is electrically connected to the temperature measuring element and the flow valve, and the controller controls the opening degree of the flow valve according to the actual temperature detected by the temperature measuring element.

[0015] Alternatively, the flow valve has a plurality of opening degree positions, each of the temperature intervals of the heat exchange components corresponds to one of the opening degree positions, and the opening degree position is selected according to the actual temperature detected by the temperature measuring element.

[0016] In an embodiment of the present application, the steam output component comprises a steam header and a steam tube plate, one end of the steam tube plate is connected to each of the heat exchange components, the other end of the steam tube plate is connected to the steam header, and the temperature measuring element is arranged in the steam tube plate.

[0017] In an embodiment of the present application, each of the water supply components corresponds to one of the heat exchange components, or each of the water supply components corresponds to at least two of the heat exchange components.

[0018] In an embodiment of the present application, the water supply component comprises a water supply pipe and a water supply tube plate, one end of the water supply pipe is connected to the water supply tube plate, and the water supply tube plate is connected to the heat exchange component through the shell.

[0019] In an embodiment of the present application, the steam generator capable of reducing steam temperature difference further comprises a main water supply pipe, which is connected to a water source and each of the water supply components.

[0020] In an embodiment of the present application, the heat exchange component comprises a center pipe, an outer sleeve pipe, and a heat exchange pipe, the outer sleeve pipe is sleeved on the center pipe and surrounds an annular space, the heat exchange pipe is arranged in the annular space, one end of the heat exchange pipe is connected to the water supply component, and the other end of the heat exchange pipe is connected to the steam output component.

[0021] In an embodiment of the present application, the steam generator capable of reducing steam temperature difference further comprises a main feedwater pipe, the steam output assembly comprises a steam header and a steam tube plate, the feedwater assembly comprises a feedwater pipe and a feedwater tube plate, the heat exchange assembly comprises a central pipe, a jacket pipe and a heat exchange pipe, the jacket pipe is sleeved on the central pipe and surrounds an annular space, the heat exchange pipe is arranged in the annular space, each feedwater assembly corresponds to one heat exchange assembly, one end of the feedwater pipe is connected to the feedwater tube plate, the other end of the feedwater pipe is connected to one end of the heat exchange pipe, the other end of the heat exchange pipe is connected to one end of the steam tube plate, the other end of the steam tube plate is connected to the steam header, and the temperature measuring element is arranged on the steam tube plate.

[0022] After the above technical scheme is adopted, the present application has at least the following technical effects:

[0023] The steam generator capable of reducing steam temperature difference has a shell with a heat source inlet, a heat source outlet, a feedwater inlet and a steam outlet communicating with a hollow accommodating chamber, a plurality of heat exchange assemblies are arranged in the shell, a plurality of feedwater assemblies are arranged on the outer side of the shell, one end of each feedwater assembly penetrates through the shell and is connected to at least one heat exchange assembly, a steam output assembly is arranged in the steam outlet and is connected to the plurality of heat exchange assemblies, and each feedwater assembly corresponds to one adjusting assembly, so that the feedwater flow in the feedwater assembly can be adjusted by the corresponding adjusting assembly.

[0024] The heat source enters the accommodating chamber of the shell through the heat source inlet and contacts the heat exchange assembly, at the same time, the feedwater assembly delivers water to the heat exchange assembly, the heat source and the water exchange heat through the heat exchange assembly, the water absorbs heat and becomes steam which enters the steam output assembly through the heat exchange assembly, and the steam generated by the plurality of heat exchange assemblies is gathered and output as main steam through the steam output assembly. The steam generator capable of reducing steam temperature difference can adjust the feedwater flow in the feedwater assembly by the adjusting assembly, so as to adjust the temperature of the steam output by the heat exchange assembly, balance the steam temperature delivered by each heat exchange assembly to the steam output assembly, reduce the temperature difference of the steam, ensure the yield and quality of the steam, and avoid generating thermal stress, thereby ensuring the use performance of the steam generator capable of reducing steam temperature difference. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 FIG. 1 is a sectional view of the steam generator capable of reducing steam temperature difference according to an embodiment of the present application.

[0026] Figure 2 FIG. 2 is a sectional view of the steam generator capable of reducing steam temperature difference according to another embodiment of the present application. Figure 1 FIG. 3 is an enlarged view of part A of the steam generator capable of reducing steam temperature difference shown in FIG. 2.

[0027] Figure 3 FIG. 4 is a sectional view of the steam generator capable of reducing steam temperature difference according to another embodiment of the present application. Figure 1A partial enlarged view of the steam generator capable of reducing steam temperature difference at B.

[0028] Wherein: 100, the steam generator capable of reducing steam temperature difference; 110, the shell; 111, the heat source inlet; 112, the heat source outlet; 113, the feedwater inlet; 114, the steam outlet; 120, the heat exchange assembly; 121, the central tube; 122, the outer sleeve tube; 123, the heat exchange tube; 130, the feedwater assembly; 131, the feedwater pipe; 132, the feedwater tube plate; 140, the steam output assembly; 141, the steam tube plate; 1411, the conveying channel; 142, the steam header; 150, the adjusting assembly; 151, the flow valve; 152, the temperature measuring element; 160, the main feedwater pipe. DETAILED DESCRIPTION

[0029] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways other than those described herein without departing from the spirit of the present application. It is therefore intended that the present application not be limited to the embodiments disclosed herein for purposes of disclosure.

[0030] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0032] In the present application, unless specifically defined otherwise, if there is an appearance of the terms "installation", "connection", "connection", "fixation" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the present application, unless specifically defined otherwise, if there is a description of the first feature "on" or "under" the second feature and the like, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0034] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0035] Referring to Figure 1 The present application provides a steam generator 100 capable of reducing steam temperature difference. The steam generator 100 capable of reducing steam temperature difference is applied to the field of nuclear power generation and power, and can generate steam to meet the actual use demand. Of course, in other embodiments of the present application, the steam generator 100 capable of reducing steam temperature difference can also be applied to other fields requiring the use of steam. Figure 1 The cross-sectional view of the steam generator 100 capable of reducing steam temperature difference according to an embodiment of the present application.

[0036] It can be understood that the current split modular steam generator has a plurality of heat exchange modules, each of which can independently exchange heat and generate steam. However, under actual service conditions, different modules are affected by various factors, and steam is generated in sequence. Moreover, there are differences in the resistance along the way in the module, which makes the distribution of water flow in different modules uneven and uncontrollable, affecting the yield and quality of steam. Moreover, the difference in water flow distribution between modules makes the temperature difference on the steam tube plate larger, generating a larger thermal stress, affecting the performance of the steam generator.

[0037] Therefore, the present application provides a novel steam generator 100 capable of reducing steam temperature difference, which can reduce the temperature difference of steam output by each module, thereby ensuring the yield and quality of steam, and also avoiding the generation of thermal stress, ensuring the performance of the steam generator 100 capable of reducing steam temperature difference. The specific structure of the steam generator 100 capable of reducing steam temperature difference of an embodiment is introduced below.

[0038] Referring to Figure 1 In an embodiment, the steam generator 100 capable of reducing steam temperature difference includes a shell 110, a plurality of heat exchange assemblies 120, a plurality of water supply assemblies 130, a steam output assembly 140, and a plurality of adjusting assemblies 150. The shell 110 has a hollow containing chamber and a heat source inlet 111, a heat source outlet 112, a water inlet 113, and a steam outlet 114. The heat source inlet 111 and the heat source outlet 112 are arranged on the shell 110 and communicate with the containing chamber. The water inlet 113 and the steam outlet 114 are arranged on the shell 110 and communicate with the containing chamber. The plurality of heat exchange assemblies 120 are arranged in the containing chamber. The plurality of water supply assemblies 130 are located outside the shell 110, one end of the water supply assembly 130 penetrates the shell 110 and communicates with at least one heat exchange assembly 120. The steam output assembly 140 is arranged at the steam outlet 114 and connected with the heat exchange assembly 120. Each adjusting assembly 150 corresponds to a water supply assembly 130 and is used for adjusting the water flow in the corresponding water supply assembly 130.

[0039] The shell 110 is a housing of the steam generator capable of reducing steam temperature difference, the shell 110 is hollow, and each component of the steam generator capable of reducing steam temperature difference is arranged in the shell 110, thereby playing a protection role. Moreover, the steam generator capable of reducing steam temperature difference generates steam in the shell 110, thereby ensuring the sealing of the steam generator capable of reducing steam temperature difference and avoiding steam leakage. The shell 110 has a heat source inlet 111, a heat source outlet 112, a water inlet 113 and a steam outlet 114, and the heat source inlet 111, the heat source outlet 112, the water inlet 113 and the steam outlet 114 are all communicated with the containing chamber of the shell 110. Optionally, the heat source inlet 111 and the heat source outlet 112 are arranged at opposite ends of the shell 110.

[0040] The heat source inlet 111 and the heat source outlet 112 are arranged at opposite ends of the shell 110, and the water inlet 113 and the steam outlet 114 are arranged at opposite ends of the shell 110. The heat exchange assembly 120 is located in the containing chamber of the shell 110, the heat source inlet 111 can input heat source into the shell 110, and the heat source can exchange heat with the heat exchange assembly 120 in the containing chamber after entering the shell 110, and the heat source after heat release is recycled through the heat source outlet 112 to be reheated, thereby realizing the reuse of the heat source. Optionally, the heat source is helium or other fluid with heat and capable of heating water into steam. The water inlet 113 delivers water to the heat exchange assembly 120, and the water exchanges heat with the heat source in the heat exchange assembly 120, so that the water can become steam after heat absorption and be delivered through the steam outlet 114 to meet the use demand.

[0041] The steam output assembly 140 is arranged at the steam outlet 114 and connected with the heat exchange assembly 120. The water supply assembly 130 is arranged outside the shell 110, and one end of the water supply assembly 130 extends into the shell 110 through the water inlet 113 of the shell 110 to be connected with the heat exchange assembly 120. In this way, the water supply assembly 130 delivers water to the heat exchange assembly 120, at the same time, the heat source enters the shell 110 through the heat source inlet 111, the heat source exchanges heat with the water through the heat exchange assembly 120, the heat-released heat source is discharged through the heat source outlet 112, and the water after heat absorption becomes steam and enters the steam output assembly 140 to be output through the steam output assembly 140.

[0042] The number of the heat exchange assemblies 120 is multiple, the multiple heat exchange assemblies 120 are arranged in the accommodating chamber of the shell 110 in intervals, the number of the water supply assemblies 130 is also multiple, each water supply assembly 130 is connected to one end of at least one heat exchange assembly 120, and the other end of the multiple heat exchange assemblies 120 is connected to the steam output assembly 140. In this way, the steam output by the multiple heat exchange assemblies 120 can be gathered into the steam output assembly 140, and the main steam is output through the steam output assembly 140.

[0043] In order to ensure that the steam temperature of each heat exchange assembly 120 transported into the steam output assembly 140 is balanced, the steam generator 100 capable of reducing the steam temperature difference of the present application further comprises an adjusting assembly 150, which can adjust the water flow in the water supply assembly 130, so as to adjust the water flow into the heat exchange assembly 120, so as to adjust the steam temperature output by the heat exchange assembly 120. It can be understood that when each heat exchange assembly 120 exchanges heat with the heat source, the heat released by the heat source is the same. When it is necessary to reduce the temperature of the steam in the heat exchange assembly 120, the adjusting assembly 150 can increase the water flow in the water supply assembly 130, at this time, more water enters the heat exchange assembly 120 to exchange heat with the heat source, so as to reduce the temperature of the steam output by the heat exchange assembly 120. Similarly, when it is necessary to increase the temperature of the steam in the heat exchange assembly 120, the adjusting assembly 150 reduces the water flow in the water supply assembly 130, at this time, a small amount of water enters the heat exchange assembly 120 to exchange heat with the heat source, so as to increase the temperature of the steam output by the heat exchange assembly 120.

[0044] The steam generator 100 capable of reducing the steam temperature difference of the above-mentioned embodiment adjusts the water flow in the water supply assembly 130 through the adjusting assembly 150, so as to adjust the temperature of the steam output by the heat exchange assembly 120, so that the steam temperature of each heat exchange assembly 120 transported into the steam output assembly 140 is balanced, the temperature difference of the steam is reduced, so as to ensure the yield and quality of the steam, and at the same time, the thermal stress can be avoided, and the use performance of the steam generator 100 capable of reducing the steam temperature difference is ensured.

[0045] Optionally, the heat source inlet 111 and the heat source outlet 112 and the water inlet 113 and the steam outlet 114 are arranged in cross. That is, the heat source inlet 111 corresponds to the steam outlet 114, and the heat source outlet 112 corresponds to the water inlet 113. In this way, the heat exchange area of the heat source and the water can be increased, and the heat exchange effect can be ensured.

[0046] Optionally, the steam generator 100 capable of reducing the steam temperature difference is arranged in a vertical, horizontal or inclined manner. Figure 1As shown, the steam generator 100, which reduces steam temperature difference, is vertically arranged. The heat source inlet 111 and steam outlet 114 are located on the top sides of the steam generator 100, while the heat source outlet 112 and feedwater inlet 113 are located at the bottom. Of course, in other embodiments of this application, the steam generator 100 can also be horizontally arranged or placed at any angle.

[0047] See Figure 1 In one embodiment, the regulating component 150 includes a flow valve 151, which is disposed in the water supply component 130. Adjusting the opening degree of the flow valve 151 regulates the water flow rate in the water supply component 130. The flow valve 151 is used to regulate the water flow rate in the water supply component 130. Adjusting the flow valve 151 allows for different water flow rates to be delivered by the water supply component 130. Each water supply component 130 corresponds to one flow valve 151, and the water flow rate in the corresponding water supply component 130 is regulated by the corresponding flow valve 151.

[0048] See Figure 1 and Figure 2 The regulating component 150 also includes a temperature sensing element 152, which is disposed in the steam output component 140 and is used to detect the actual temperature of the steam output from the corresponding heat exchange component 120. Figure 2 for Figure 1 The diagram shows a partial enlarged view at point A of the steam generator 100, which reduces the steam temperature difference. Each heat exchange component 120 corresponds to a temperature sensing element 152, which can detect the actual temperature of the steam delivered from the heat exchange component 120 to the steam output component 140.

[0049] Understandably, after multiple temperature sensing elements 152 detect the temperature of their respective heat exchange components 120, if most of the temperature sensing elements 152 detect the actual steam temperature to be basically consistent, and only a small number of temperature sensing elements 152 detect the actual steam temperature to be higher or lower, then the flow rate of the water supply component 130 corresponding to the small number of temperature sensing elements 152 is adjusted by the flow valve 151 to adjust the steam temperature, reduce the temperature difference of the steam output from each heat exchange component 120, and thus make the temperature of the steam delivered to the steam output component 140 by each heat exchange component 120 basically uniform.

[0050] Optionally, the temperature sensing element 152 is a thermocouple. Of course, in other embodiments of this application, the temperature sensing element 152 may also be other sensors capable of temperature detection.

[0051] The steam generator 100 capable of reducing steam temperature difference of the present application adjusts the opening of the flow valve 151 through the actual temperature data of the steam monitored by the temperature measuring element 152, so as to adjust the temperature of the steam output by the heat exchange assembly 120. It can be understood that the opening of the flow valve 151 can be automatically adjusted according to the actual temperature of the steam detected by the temperature measuring element 152, or manually adjusted.

[0052] In an embodiment of the present application, the steam generator 100 capable of reducing steam temperature difference further comprises a controller, which is electrically connected to the temperature measuring element 152 and the flow valve 151. The controller controls the opening of the flow valve 151 according to the actual temperature detected by the temperature measuring element 152. In this embodiment, the temperature measuring element 152 can detect the actual temperature of the steam in the steam output assembly 140 in real time, and feed the data of the actual temperature to the controller. After the corresponding temperature measuring element 152 of each heat exchange assembly 120 feeds the corresponding actual temperature to the controller, the controller compares the data of the actual temperatures, and selects the temperature data that is too low or too high, and controls the corresponding flow valve 151 to adjust the opening.

[0053] That is, through the electrical connection of the controller, the temperature measuring element 152 and the flow valve 151, the embodiment can realize real-time online adjustment of the water flow of different heat exchange assemblies 120, so as to balance the temperature of the steam delivered by each heat exchange assembly 120 to the steam output assembly 140, and reduce the temperature difference.

[0054] Of course, in another embodiment of the present application, the opening of the flow valve 151 is adjusted manually. Prior to the actual use of the steam generator 100 capable of reducing steam temperature difference, simulation tests are carried out under different working conditions, and the parameters detected by the temperature measuring element 152 and the opening of the flow valve 151 and other related parameters in the steam generator 100 capable of reducing steam temperature difference are fixed through the tests. In this way, during the actual use of the steam generator 100 capable of reducing steam temperature difference, the opening of the flow valve 151 can be adjusted according to the working condition of the steam generator 100 capable of reducing steam temperature difference, so as to ensure that the temperature of the steam delivered by each heat exchange assembly 120 to the steam output assembly 140 is balanced.

[0055] For example, the flow valve 151 has multiple opening levels, and each temperature interval of the heat exchange assembly 120 corresponds to an opening level, and the opening level is selected according to the actual temperature detected by the temperature measuring element 152. That is, the opening of the flow valve 151 is divided into multiple different opening levels, and each temperature interval of the steam output by the heat exchange assembly 120 corresponds to an opening level, and the corresponding flow valve 151 can be adjusted according to the temperature of the steam output by the heat exchange assembly 120.

[0056] Of course, in other embodiments of the present application, the user can also adjust the opening of the flow valve 151 in real time according to the actual use requirements.

[0057] Referring to Figure 1 In an embodiment, the steam output assembly 140 comprises a steam header 142 and a steam tube plate 141, one end of the steam tube plate 141 is connected with each heat exchange assembly 120, the other end of the steam tube plate 141 is connected with the steam header 142, and the temperature measuring element 152 is arranged on the steam tube plate 141. The steam tube plate 141 is arranged in the steam outlet 114, and the steam tube plate 141 connects each heat exchange assembly 120 and the steam header 142. Each heat exchange assembly 120 can respectively deliver the heat-exchanged steam into the steam tube plate 141, the steam is gathered through the steam tube plate 141, and then delivered into the steam header 142, and the main steam is output through the steam header 142.

[0058] It can be understood that the heat exchange assembly 120 is connected with the steam tube plate 141 through the connecting pipe. The steam tube plate 141 has a plurality of groups of delivery channels 1411, one end of each group of delivery channels 1411 is connected with the delivery pipe of one heat exchange assembly 120, and the other end of each group of delivery channels 1411 is communicated with the steam header 142. Each heat exchange assembly 120 delivers steam into the delivery channel 1411 of the steam tube plate 141 through the corresponding connecting pipe, and then each group of delivery channels 1411 gathers the steam into the steam header 142. Each group of delivery channels 1411 corresponds to at least one temperature measuring element 152, and the temperature of the steam in the corresponding delivery channel 1411 is measured through the temperature measuring element 152.

[0059] Optionally, the number of delivery channels 1411 in each group of delivery channels 1411 is one, and the steam of the heat exchange assembly 120 is gathered into the steam header 142 through one delivery channel 1411. Of course, in other embodiments of the present application, the number of delivery channels 1411 in each group of delivery channels 1411 can also be multiple, one end of the multiple delivery channels 1411 is connected with the delivery pipe of the same heat exchange assembly 120, and the other end of the multiple delivery channels 1411 is communicated with the steam header 142, so that the steam can be separated and the eddy current loss can be reduced.

[0060] Optionally, when the number of temperature measuring elements 152 is one, one temperature measuring element 152 is arranged at a detection position of the delivery channel 1411, and the detection position refers to a position that can directly detect the actual temperature of the steam delivered by the heat exchange assembly 120. Of course, in other embodiments of the present application, the number of temperature measuring elements 152 can also be multiple, and the multiple temperature measuring elements 152 are arranged at the end of one group of delivery channels 1411, for detecting the actual temperature of the steam delivered by the heat exchange assembly 120.

[0061] Referring to Figure 1In an embodiment, each water supply assembly 130 corresponds to one heat exchange assembly 120. That is, each water supply assembly 130 supplies water to one heat exchange assembly 120, and each water supply assembly 130 is provided with one flow valve 151 and one temperature measuring element 152. In this way, the temperature measuring element 152 can adjust the water flow in the water supply assembly 130 by controlling the corresponding flow valve 151, so as to adjust the water flow into the corresponding heat exchange assembly 120, thereby achieving the temperature adjustment of the outlet steam.

[0062] Of course, in other embodiments of the present application, each water supply assembly 130 can correspond to at least two heat exchange assemblies 120. That is, one water supply assembly 130 supplies water to multiple heat exchange assemblies 120 through the cooperation of one flow valve 151 and one temperature measuring element 152. In this way, the number of water supply assemblies 130 and flow valves 151 can be reduced, and the operation and management difficulty can be reduced.

[0063] Referring to Figure 1 In an embodiment, the water supply assembly 130 includes a water supply pipe 131 and a water supply pipe plate 132, one end of the water supply pipe 131 is connected to the water supply pipe plate 132, and the water supply pipe plate 132 is connected to the heat exchange assembly 120 through the shell 110. The water supply pipe plate 132 is arranged in the water inlet 113 of the shell 110, so that the water supply pipe plate 132 is connected to the heat exchange assembly 120 through the shell 110. One end of the water supply pipe 131 is connected to a water source, and the other end of the water supply pipe 131 is connected to the water supply pipe plate 132. In this way, the water source delivers water to the water supply pipe plate 132 through the water supply pipe 131, and delivers the water to the heat exchange assembly 120 through the water supply pipe plate 132.

[0064] Referring to Figure 1 In an embodiment, the steam generator 100 capable of reducing the steam temperature difference further includes a main water supply pipe 160 connected to the water source and each water supply assembly 130. It can be understood that, since the number of water supply assemblies 130 is multiple, in order to facilitate the connection of the water source to each water supply assembly 130, the steam generator 100 capable of reducing the steam temperature difference of the present application is provided with the main water supply pipe 160, which is connected to one end of the water supply pipe 131 of each water supply assembly 130. In this way, the water in the water source can be delivered to the main water supply pipe 160, and the main water supply pipe 160 can branch the water therein to each water supply pipe 131.

[0065] Optionally, the main water supply pipe 160 is circular. Of course, in other embodiments of the present application, the main water supply pipe 160 can also be polygonal or the like.

[0066] Referring to Figure 1 and Figure 3In an embodiment, the heat exchange assembly 120 comprises a center tube 121, an outer sleeve tube 122, and a heat exchange tube 123. The outer sleeve tube 122 is sleeved on the center tube 121 and surrounds an annular space. The heat exchange tube 123 is arranged in the annular space. One end of the heat exchange tube 123 is connected to the water supply assembly 130, and the other end is connected to the steam output assembly 140. Figure 3 For Figure 1 A partial enlarged view of the steam generator 100 capable of reducing steam temperature difference at B is shown.

[0067] The center tube 121 and the outer sleeve tube 122 provide a mounting space for the heat exchange tube 123, so that the heat exchange tube 123 can be reliably fixed in the shell 110. The center tube 121 is arranged in the outer sleeve tube 122 and has a certain spacing between the center tube 121 and the outer sleeve tube 122. In this way, the center tube 121 and the outer sleeve tube 122 can surround an annular space. The heat exchange tube 123 is located in the annular space. One end of the heat exchange tube 123 is connected to the water supply tube plate 132 of the water supply assembly 130, and the other end is connected to the steam tube plate 141 of the steam output assembly 140 through a connecting pipe. In this way, the water supply tube plate 132 can deliver water into the heat exchange tube 123, and at the same time, the heat source entering the shell 110 can contact the outer wall of the heat exchange tube 123, so as to realize heat exchange between the water and the heat source. After the water absorbs heat, the water becomes steam and enters the steam tube plate 141.

[0068] Optionally, the heat exchange assembly 120 comprises a support frame arranged between the center tube 121 and the outer sleeve tube 122, supporting and connecting the center tube 121 and the outer sleeve tube 122, and supporting and connecting the heat exchange tube 123. Optionally, the heat exchange tube 123 is a plurality of heat exchange tubes 123 arranged at intervals in the annular space. Of course, in other embodiments of the present application, the number of heat exchange tubes 123 can also be one. Optionally, the steam generator 100 capable of reducing steam temperature difference further comprises a mounting seat arranged in the shell 110. The mounting seat is fixedly connected to the outer sleeve tube 122, so that the heat exchange assembly 120 is fixed in the shell 110 through the mounting seat.

[0069] It is worth noting that the heat exchange tube 123 is a straight tube, and can also be a spiral tube. Moreover, when the heat exchange tube 123 is a spiral tube, the spiral tube can be wound clockwise or counterclockwise. When the heat exchange tube 123 is a plurality of heat exchange tubes 123, the plurality of heat exchange tubes 123 that are spiral tubes can be on one cylindrical surface or on a plurality of cylindrical surfaces.

[0070] Referring to Figure 1 and Figure 2In the embodiment, the steam generator 100 capable of reducing steam temperature difference further comprises a main feedwater pipe 160, the steam output assembly 140 comprises a steam header 142 and a steam tube plate 141, the feedwater assembly 130 comprises a feedwater pipe 131 and a feedwater tube plate 132, and the heat exchange assembly 120 comprises a central pipe 121, a jacket pipe 122 and a heat exchange pipe 123, the jacket pipe 122 is sleeved on the central pipe 121 and surrounds an annular space, the heat exchange pipe 123 is arranged in the annular space, each feedwater assembly 130 corresponds to a heat exchange assembly 120, one end of the feedwater pipe 131 is connected to the feedwater tube plate 132, the other end of the feedwater pipe 131 is connected to one end of the heat exchange pipe 123, the other end of the heat exchange pipe 123 is connected to one end of the steam tube plate 141, the other end of the steam tube plate 141 is connected to the steam header 142, and the temperature measuring element 152 is arranged on the steam tube plate 141.

[0071] The heat source enters the shell 110 through the heat source inlet 111, exchanges heat with the heat exchange pipe 123, and flows out through the heat source outlet 112 after heat release. The feedwater pipe 131 delivers water to the heat exchange pipe 123 through the feedwater tube plate 132, and the water becomes steam after absorbing heat and enters the steam tube plate 141. The heat source is a primary heat exchange medium, and the water is a secondary heat exchange medium. That is, the primary heat exchange medium enters the steam generator 100 capable of reducing steam temperature difference from the heat source inlet 111, flows through the heat exchange pipe 123 to complete heat exchange with the secondary heat exchange medium, and then flows out of the steam generator 100 capable of reducing steam temperature difference from the heat source outlet 112. The secondary heat exchange medium flows into each heat exchange pipe 123 corresponding to the heat exchange assembly 120 from the feedwater tube plate 132, completes heat exchange with the primary heat exchange medium, and then enters the steam header 142 through the steam tube plate 141 and flows out of the steam generator 100 capable of reducing steam temperature difference.

[0072] The steam generator 100 capable of reducing steam temperature difference of the application can realize controllable adjustment of different feedwater flow distribution in the heat exchange assembly 120 through cooperation of the flow valve 151 and the temperature measuring element 152, and reduce the temperature difference and thermal stress of the steam tube plate 141. The temperature measuring element 152 can monitor real-time temperature data of steam output by the heat exchange assembly 120 in the steam tube plate 141 in real time, and the flow valve 151 can feed back the opening of the flow valve 151 in a manual or automatic manner according to the real-time temperature data, so as to control the feedwater flow and adjust the temperature of steam output by the heat exchange assembly 120 in the steam tube plate 141, thereby reducing the temperature difference of steam output by different heat exchange assemblies 120 in the steam tube plate 141 and balancing the temperature of each steam in the steam header 142.

[0073] Further, under the premise of controllable adjustment of the feedwater flow, the out-of-pile thermal state verification test of the heat exchange assembly 120 can more effectively demonstrate and migrate the application to the actual service state of the module. At the same time, the steam generator 100 with reduced steam temperature difference can enhance the service capability of the steam generator 100 with reduced steam temperature difference under different flow conditions (flow, temperature, etc.) by adjusting the feedwater flow, ensure the service safety and structural integrity of the steam generator 100 with reduced steam temperature difference, and obtain a large amount of steam with uniform quality, prolong the service life of the steam generator 100 with reduced steam temperature difference.

[0074] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, but as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present disclosure.

[0075] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation on the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A steam generator capable of reducing steam temperature difference, characterized in that, The steam generator capable of reducing steam temperature difference is applied to nuclear power generation and power equipment, and comprises: a shell having a hollow accommodating chamber and a heat source inlet, a heat source outlet, a feedwater inlet and a steam outlet, the heat source inlet, the heat source outlet, the feedwater inlet and the steam outlet being arranged on the shell and being communicated with the accommodating chamber; a plurality of heat exchange assemblies arranged in the accommodating chamber; a plurality of feedwater assemblies arranged outside the shell, one end of each of the feedwater assemblies penetrating the feedwater inlet of the shell and being communicated with at least one of the heat exchange assemblies; a steam output assembly arranged on the steam outlet and connected with the heat exchange assemblies; and a plurality of adjusting assemblies, each of which corresponds to one of the feedwater assemblies and is used for adjusting the flow of feedwater in the corresponding feedwater assembly. After the heat source enters the shell through the heat source inlet, the heat source can exchange heat with each of the heat exchange assemblies in the accommodating chamber, and the heat exchange assembly is discharged through the heat source outlet and is recycled for heating, and the heat source is helium.

2. The reduced vapor temperature difference steam generator of claim 1, wherein The adjusting assembly comprises a flow valve arranged on the feedwater assembly, and the opening degree of the flow valve can be adjusted to adjust the flow of feedwater in the feedwater assembly.

3. The reduced vapor temperature difference steam generator of claim 2, wherein, The adjusting assembly further comprises a temperature measuring element arranged in the steam output assembly and used for detecting the actual temperature of the steam output by the corresponding heat exchange assembly.

4. The reduced vapor temperature difference steam generator of claim 3, wherein The steam generator capable of reducing steam temperature difference further comprises a controller electrically connected with the temperature measuring element and the flow valve, and the controller controls the opening degree of the flow valve according to the actual temperature detected by the temperature measuring element. Alternatively, the flow valve has a plurality of opening degree positions, each temperature range of the heat exchange assemblies corresponds to one of the opening degree positions, and the opening degree position is selected according to the actual temperature detected by the temperature measuring element.

5. The reduced vapor temperature difference steam generator of claim 3, wherein The steam output assembly comprises a steam header and a steam tube plate, one end of the steam tube plate is connected with each of the heat exchange assemblies, the other end of the steam tube plate is connected with the steam header, and the temperature measuring element is arranged on the steam tube plate.

6. The reduced vapor temperature difference steam generator according to any one of claims 1 to 5, characterized by, Each of the feedwater assemblies corresponds to one of the heat exchange assemblies, or each of the feedwater assemblies corresponds to at least two of the heat exchange assemblies.

7. The reduced vapor temperature difference steam generator according to any one of claims 1 to 5, wherein The feedwater assembly comprises a feedwater pipe and a feedwater tube plate, one end of the feedwater pipe is connected with the feedwater tube plate, and the feedwater tube plate penetrates the shell and is connected with the heat exchange assembly.

8. The reduced vapor temperature difference steam generator according to any one of claims 1 to 5, wherein The steam generator capable of reducing steam temperature difference further comprises a main feedwater pipe connected with a water source and each of the feedwater assemblies.

9. The reduced vapor temperature difference steam generator according to any one of claims 1 to 5, wherein The heat exchange assembly comprises a center pipe, an outer sleeve pipe and a heat exchange pipe, the outer sleeve pipe is sleeved on the center pipe and surrounds an annular space, the heat exchange pipe is arranged in the annular space, one end of the heat exchange pipe is connected with the feedwater assembly, and the other end of the heat exchange pipe is connected with the steam output assembly.

10. The reduced vapor temperature difference steam generator according to claim 3 or 4, wherein The steam generator capable of reducing steam temperature difference further comprises a main feedwater pipe, the steam output assembly comprises a steam header and a steam tube plate, the feedwater assembly comprises a feedwater pipe and a feedwater tube plate, the heat exchange assembly comprises a central pipe, an outer sleeve pipe and a heat exchange pipe, the outer sleeve pipe is sleeved on the central pipe and surrounds an annular space, the heat exchange pipe is arranged in the annular space, each feedwater assembly corresponds to one heat exchange assembly, one end of the feedwater pipe is connected to the feedwater tube plate, the other end of the feedwater pipe is connected to one end of the heat exchange pipe, the other end of the heat exchange pipe is connected to one end of the steam tube plate, the other end of the steam tube plate is connected to the steam header, and the temperature measuring element is arranged on the steam tube plate.

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