CN116697329A - Steam generator capable of reducing steam temperature difference - Google Patents

Abstract

The application relates to a steam generator capable of reducing steam temperature difference, comprising: the shell is provided with a containing cavity, a heat source inlet, a heat source outlet, a water supply inlet and a steam outlet, and the heat source inlet, the heat source outlet, the water supply inlet and the steam outlet are arranged on the shell and are respectively communicated with the containing cavity; the heat exchange assemblies are arranged in the accommodating chamber at intervals; the water supply assemblies penetrate through the shell at one end and are communicated with the at least one heat exchange assembly; the steam output assembly is arranged at the steam outlet and is connected with the heat exchange assembly; and a plurality of adjusting assemblies, each adjusting assembly corresponds to one water supply assembly and is used for adjusting the water supply flow in the corresponding water supply assembly. So can adjust the temperature of heat exchange component output steam for each heat exchange component carries the steam temperature equilibrium of steam output component, reduces the difference in temperature of steam, guarantees the output and the quality of steam, can also avoid producing thermal stress simultaneously, guarantees steam generator's performance.

Description

Steam generator capable of reducing steam temperature difference

Technical Field

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

Background

The direct-current steam generator can directly generate superheated steam and ultrahigh-pressure and supercritical-parameter steam, so that higher power generation efficiency is achieved, and the direct-current steam generator is compact in structure and widely applied to the fields of nuclear power generation and power. The main design of the direct-current type steam generator is divided into two types, one is an integrated large spiral pipe type design, and the other is a separated modularized design.

For the split modularized steam generator, the main advantages are that the internal modules can be produced in batches, the manufacturing cost is low, each module can carry out an out-of-pile thermal state verification test, the uniformity of the steam temperature is ensured to a certain extent, and the split modularized steam generator is of a better direct-current type and is convenient to popularize and apply.

Typically, a split modular steam generator has a plurality of heat exchange modules, each capable of independently exchanging heat and generating steam. However, under actual service conditions, different modules are affected by a plurality of factors, steam is generated successively, and in addition, the on-way resistance in the modules is different, so that the distribution of water supply flow in the different modules is uneven and uncontrollable, and the yield and quality of the steam are affected. Moreover, the difference of water supply flow distribution among the modules makes the temperature difference on the steam tube plate larger, generates larger thermal stress, and influences the service performance of the steam generator.

Disclosure of Invention

Based on the above, it is necessary to provide a steam generator capable of reducing the temperature difference of steam and ensuring the balance of the steam temperature to ensure the steam yield and quality, aiming at the problem of large temperature difference of a steam tube plate in the current steam generator.

A steam generator for reducing a temperature difference of steam, comprising:

the shell is provided with a hollow accommodating cavity, a heat source inlet, a heat source outlet, a water supply inlet and a steam outlet, and the heat source inlet, the heat source outlet, the water supply inlet and the steam outlet are arranged in the shell and are respectively communicated with the accommodating cavity;

the heat exchange assemblies are arranged in the accommodating chamber at intervals;

the water supply assemblies are positioned on the outer side of the shell, and one end of each water supply assembly passes through the water supply inlet of the shell and is communicated with at least one heat exchange assembly;

the steam output assembly is arranged at the steam outlet and is connected with the heat exchange assembly; and

and each adjusting assembly corresponds to one water supply assembly and is used for adjusting the water supply flow in the corresponding water supply assembly.

In an embodiment of the application, the adjusting assembly comprises a flow valve, the flow valve is arranged on the water supply assembly, and the opening degree of the flow valve can adjust the water supply flow in the water supply assembly when being adjusted.

In an embodiment of the application, the adjusting assembly further comprises a temperature measuring element, and the temperature measuring element is arranged in the steam output assembly and is used for detecting the actual temperature of the steam output by the corresponding heat exchange assembly.

In an embodiment of the application, the steam generator capable of reducing the steam temperature difference further includes a controller, the controller is electrically connected with the temperature measuring element and the flow valve, and the controller controls the opening of the flow valve according to the actual temperature detected by the temperature measuring element;

or the flow valve is provided with a plurality of opening gears, each temperature interval of the heat exchange assembly corresponds to one opening gear, and the opening gears are selected according to the actual temperature detected by the temperature measuring element.

In an embodiment of the present application, the steam output assembly includes a steam header and a steam tube plate, one end of the steam tube plate is connected to each heat exchange assembly, the other end of the steam tube plate is connected to the steam header, and the temperature measuring element is disposed on the steam tube plate.

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

In one embodiment of the application, the water supply assembly comprises a water supply pipeline and a water supply pipe plate, one end of the water supply pipeline is connected with the water supply pipe plate, and the water supply pipe plate is connected with the heat exchange assembly through the shell.

In an embodiment of the present application, the steam generator capable of reducing steam temperature difference further includes a main water supply pipe, and the main water supply pipe connects a water source and each water supply assembly.

In an embodiment of the application, the heat exchange assembly comprises a central tube, an outer sleeve and a heat exchange tube, wherein the outer sleeve is sleeved on the central tube and surrounds an annular space, the heat exchange tube is arranged in the annular space, one end of the heat exchange tube is connected with the water supply assembly, and the other end of the heat exchange tube is connected with the steam output assembly.

In an embodiment of the application, the steam generator capable of reducing the steam temperature difference further comprises a main water feeding pipe, the steam output assembly comprises a steam header and a steam tube plate, the water feeding assembly comprises a water feeding pipe and a water feeding pipe plate, the heat exchange assembly comprises a central pipe, an outer sleeve and a heat exchange pipe, the outer sleeve is sleeved on the central pipe and surrounds an annular space, the heat exchange pipe is arranged in the annular space, each water feeding assembly corresponds to one heat exchange assembly, one end of the water feeding pipe is connected with the water feeding pipe plate, the other end of the water feeding pipe is connected with one end of the heat exchange pipe, the other end of the heat exchange pipe is connected with one end of the steam tube plate, 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.

After the technical scheme is adopted, the application has at least the following technical effects:

the steam generator capable of reducing the steam temperature difference comprises a shell, a plurality of heat exchange components, a plurality of water supply components and a steam output component, wherein the heat source inlet, the heat source outlet, the water supply inlet and the steam outlet are communicated with a hollow accommodating cavity of the shell, the plurality of heat exchange components are arranged in the shell at intervals, the plurality of water supply components are positioned on the outer side of the shell, one end of each water supply component penetrates through the shell to be connected with at least one heat exchange component, the steam output component is positioned in the steam outlet and is connected with the plurality of heat exchange components, each water supply component corresponds to one adjusting component, and the water supply flow in the water supply component is adjusted through the corresponding adjusting component.

The heat source enters the accommodating chamber of the shell through the heat source inlet and is in contact with the heat exchange assembly, meanwhile, the water supply assembly conveys water into the heat exchange assembly, the heat source exchanges heat with the water through the heat exchange assembly, the water absorbs heat and then turns into steam, the steam enters the steam output assembly through the heat exchange assembly, and the steam generated by the heat exchange assemblies is converged through the steam output assembly and then is output as main steam. This can reduce steam temperature difference's steam generator, adjusting part can adjust the feedwater flow in the water supply assembly to adjust the temperature of heat transfer assembly output steam, make each heat transfer assembly carry the steam temperature equilibrium of steam output assembly, reduce the difference in temperature of steam, thereby guarantee steam's output and quality, can also avoid producing thermal stress simultaneously, guarantee can reduce steam temperature difference's steam generator's performance.

Drawings

Fig. 1 is a cross-sectional view of a steam generator capable of reducing a temperature difference of steam according to an embodiment of the present application.

Fig. 2 is a partial enlarged view of the steam generator at a, which can reduce the temperature difference of the steam shown in fig. 1.

Fig. 3 is a partial enlarged view of the steam generator at B, shown in fig. 1, which can reduce the temperature difference of steam.

Wherein: 100. a steam generator capable of reducing a temperature difference of steam; 110. a housing; 111. a heat source inlet; 112. a heat source outlet; 113. a feed water inlet; 114. a steam outlet; 120. a heat exchange assembly; 121. a central tube; 122. an outer sleeve; 123. a heat exchange tube; 130. a water supply assembly; 131. a water supply pipe; 132. a water feed tube panel; 140. a steam output assembly; 141. a steam tube sheet; 1411. a conveying channel; 142. a steam header; 150. an adjustment assembly; 151. a flow valve; 152. a temperature measuring element; 160. a main water supply pipe.

Detailed Description

In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.

In the description of the present application, it should be understood that, if any, these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., are used herein with respect to the orientation or positional relationship shown in the drawings, these terms refer to the orientation or positional relationship for convenience of description and simplicity of description only, and do not indicate or imply that the apparatus or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the application.

Furthermore, the terms "first," "second," and the like, if any, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the terms "plurality" and "a plurality" if any, mean at least two, such as two, three, etc., unless specifically defined otherwise.

In the present application, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly. For example, the two parts can be fixedly connected, detachably connected or integrated; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present application, unless expressly stated or limited otherwise, the meaning of a first feature being "on" or "off" a second feature, and the like, is that the first and second features are either in direct contact or in indirect contact through an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.

It will be understood that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein, if any, are for descriptive purposes only and do not represent a unique embodiment.

Referring to fig. 1, the present application provides a steam generator 100 that can reduce the temperature difference of steam. The steam generator 100 capable of reducing the steam temperature difference is applied to the nuclear power generation and power field, and can generate steam to meet the actual use requirements. Of course, in other embodiments of the present application, the steam generator 100 that can reduce the temperature difference of steam can be applied to other fields where steam is required. Fig. 1 is a cross-sectional view of a steam generator 100 capable of reducing a temperature difference of steam according to an embodiment of the present application.

It will be appreciated that current split modular steam generators have a plurality of heat exchange modules, each capable of independently exchanging heat and generating steam. However, under actual service conditions, different modules are affected by a plurality of factors, steam is generated successively, and in addition, the on-way resistance in the modules is different, so that the distribution of water supply flow in the different modules is uneven and uncontrollable, and the yield and quality of the steam are affected. Moreover, the difference of water supply flow distribution among the modules makes the temperature difference on the steam tube plate larger, generates larger thermal stress, and influences the service performance of the steam generator.

Therefore, the present application provides a novel steam generator 100 capable of reducing steam temperature difference, wherein the steam generator 100 capable of reducing steam temperature difference can reduce the temperature difference of steam output by each module, thereby ensuring the yield and quality of steam, avoiding thermal stress, and ensuring the service performance of the steam generator 100 capable of reducing steam temperature difference. The following describes a specific structure of the steam generator 100 capable of reducing a temperature difference of steam according to an embodiment.

Referring to fig. 1, in one embodiment, a steam generator 100 that may reduce steam temperature differentials includes a housing 110, a plurality of heat exchange assemblies 120, a plurality of feedwater assemblies 130, a steam output assembly 140, and a plurality of conditioning assemblies 150. The housing 110 has a hollow accommodating chamber, a heat source inlet 111, a heat source outlet 112, a water supply inlet 113 and a steam outlet 114, the heat source inlet 111 and the heat source outlet 112 are provided in the housing 110 and communicate with the accommodating chamber, and the water supply inlet 113 and the steam outlet 114 are provided in the housing 110 and communicate with the accommodating chamber. A plurality of heat exchange assemblies 120 are disposed in the receiving chamber at intervals. The water supply assemblies 130 are located outside the housing 110, and one end of the water supply assembly 130 passes through the housing 110 and communicates with the at least one heat exchange assembly 120. The steam output assembly 140 is disposed at the steam outlet 114 and is connected to the heat exchange assembly 120. Each of the adjusting assemblies 150 corresponds to one of the water supply assemblies 130 for adjusting the flow of water in the corresponding water supply assembly 130.

The shell 110 is a shell of the steam generator 100 capable of reducing steam temperature difference, the shell 110 is hollow, and all parts of the steam generator 100 capable of reducing steam temperature difference are arranged in the shell 110 to play a role in protection. Also, the steam generator 100, which can reduce the temperature difference of the steam, generates the steam in the case 110, and the sealability of the steam generator 100, which can reduce the temperature difference of the steam, is ensured by the case 110, thereby preventing the steam from leaking. The housing 110 has a heat source inlet 111, a heat source outlet 112, a water supply inlet 113, and a steam outlet 114, and the heat source inlet 111, the heat source outlet 112, the water supply inlet 113, and the steam outlet 114 are all communicated with the accommodating chamber of the housing 110. Alternatively, the heat source inlet 111 and the heat source outlet 112 are provided at opposite ends of the housing 110.

The heat source inlet 111 and the heat source outlet 112 are provided at opposite ends of the housing 110, and the feed water inlet 113 and the steam outlet 114 are provided at opposite ends of the housing 110. The heat exchange assembly 120 is located in the accommodating chamber of the housing 110, the heat source inlet 111 can input a heat source into the housing 110, after the heat source enters the housing 110, the heat source can exchange heat with the heat exchange assembly 120 in the accommodating chamber, and the heat source after heat release is recovered after passing through the heat source outlet 112, so as to be reheated, thereby realizing the recycling of the heat source. Alternatively, the heat source is helium or other fluid having heat and capable of heating water to steam. The water inlet 113 conveys water to the heat exchange assembly 120, and the water exchanges heat with a heat source in the heat exchange assembly 120, so that the water can be changed into steam after absorbing heat and is sent out through the steam outlet 114 to meet the use requirement.

The steam output assembly 140 is disposed at the steam outlet 114 and is coupled to the heat exchange assembly 120. The water supply assembly 130 is disposed at an outer side of the housing 110, and one end of the water supply assembly 130 protrudes into the housing 110 through the water supply inlet 113 of the housing 110 so as 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, and at the same time, the heat source enters the housing 110 through the heat source inlet 111, the heat source exchanges heat with the water through the heat exchange assembly 120, the heat source having released heat is discharged through the heat source outlet 112, the water absorbs heat and turns into steam, which enters the steam output assembly 140, and is output through the steam output assembly 140.

The number of the heat exchanging assemblies 120 is plural, the plural heat exchanging assemblies 120 are disposed in the accommodating chamber of the housing 110 at intervals, the number of the water supplying assemblies 130 is plural, each water supplying assembly 130 is connected with one end of at least one heat exchanging assembly 120, and the other ends of the plural heat exchanging assemblies 120 are connected with the steam output assembly 140. In this way, the steam outputted from the plurality of heat exchange assemblies 120 can be collected into the steam output assembly 140, and the main steam is outputted through the steam output assembly 140.

In order to ensure that the temperature of the steam delivered to the steam output assembly 140 by each heat exchange assembly 120 is balanced, the steam generator 100 capable of reducing the steam temperature difference of the present application further comprises an adjusting assembly 150, wherein the adjusting assembly 150 can adjust the water supply flow rate in the water supply assembly 130, thereby adjusting the water supply flow rate entering the heat exchange assembly 120 to achieve the purpose of adjusting the temperature of the steam output by the heat exchange assembly 120. It will be appreciated that each heat exchange assembly 120 exchanges heat with a heat source that releases the same amount of heat. When the temperature of the steam in the heat exchange assembly 120 needs to be reduced, the adjusting assembly 150 can increase the flow rate of the water in the water supply assembly 130, and more water enters the heat exchange assembly 120 to exchange heat with the heat source, so that the temperature of the steam output by the heat exchange assembly 120 can be reduced. Similarly, when the temperature of the steam in the heat exchange assembly 120 needs to be increased, the adjusting assembly 150 reduces the flow rate of the water in the water supply assembly 130, and at this time, a small amount of water enters the heat exchange assembly 120 to exchange heat with the heat source, so that the temperature of the steam output by the heat exchange assembly 120 can be increased.

The steam generator 100 capable of reducing the temperature difference of steam in the above embodiment adjusts the water supply 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, equalize the temperature of the steam transmitted to the steam output assembly 140 by each heat exchange assembly 120, reduce the temperature difference of steam, thereby ensuring the yield and quality of steam, avoiding the generation of thermal stress, and ensuring the service performance of the steam generator 100 capable of reducing the temperature difference of steam.

Alternatively, the heat source inlet 111 is disposed crosswise to the heat source outlet 112 and the feedwater inlet 113 is disposed crosswise to the steam outlet 114. I.e. the heat source inlet 111 corresponds to the steam outlet 114 and the heat source outlet 112 corresponds to the feedwater inlet 113. Therefore, the heat exchange area of the heat source and water can be increased, and the heat exchange effect is ensured.

Alternatively, the steam generator 100, which may reduce the temperature difference of the steam, is arranged vertically, horizontally, or obliquely. As shown in fig. 1, the steam generator 100 capable of reducing the steam temperature difference is arranged vertically, the heat source inlet 111 and the steam outlet 114 are arranged at two sides of the top of the steam generator 100 capable of reducing the steam temperature difference, and the heat source outlet 112 and the water supply inlet 113 are arranged at the bottom of the steam generator 100 capable of reducing the steam temperature difference. Of course, in other embodiments of the present application, the steam generator 100, which can reduce the temperature difference of steam, may also be disposed horizontally, or placed at any angle.

Referring to fig. 1, in an embodiment, the adjusting assembly 150 includes a flow valve 151, the flow valve 151 is disposed on the water supply assembly 130, and the opening of the flow valve 151 can adjust the water supply flow in the water supply assembly 130 when adjusting. The flow valve 151 is used to effect feedwater flow regulation in the feedwater assembly 130. The opening degree of the flow valve 151 can be adjusted when the flow valve 151 is adjusted, so that the water supply assembly 130 can deliver different water supply flows. Each of the water supply assemblies 130 corresponds to one of the flow valves 151, and the flow rate of the water supply in the corresponding water supply assembly 130 is adjusted by the corresponding flow valve 151.

Referring to fig. 1 and 2, the adjusting assembly 150 further includes a temperature measuring element 152, and the temperature measuring element 152 is disposed in the steam output assembly 140 and is used for detecting an actual temperature of the steam output by the corresponding heat exchange assembly 120. Fig. 2 is a partial enlarged view of the steam generator 100 at a, which can reduce the temperature difference of steam shown in fig. 1. Each heat exchange assembly 120 corresponds to a temperature sensing element 152, and the temperature sensing elements 152 are capable of sensing the actual temperature of the steam delivered by the heat exchange assembly 120 to the steam delivery assembly 140.

It can be understood that after the plurality of temperature measuring elements 152 respectively detect the temperatures of the corresponding heat exchanging assemblies 120, if the actual temperatures of the steam detected by the most of temperature measuring elements 152 are substantially consistent, only the actual temperatures of the steam detected by the less part of temperature measuring elements 152 are higher or lower, at this time, the flow rate of the water supplied by the less part of temperature measuring elements 152 corresponding to the water supplying assembly 130 is adjusted by the flow valve 151, so as to adjust the temperature of the steam, reduce the temperature difference of the steam output by each heat exchanging assembly 120, and thus make the temperature of the steam delivered to the steam output assembly 140 by each heat exchanging assembly 120 substantially uniform.

Optionally, the temperature measuring element 152 is a thermocouple. Of course, in other embodiments of the present application, the temperature measuring element 152 may be other sensors capable of detecting temperature.

According to the steam generator 100 capable of reducing the steam temperature difference, the opening degree of the flow valve 151 is adjusted through the actual temperature data feedback of the steam monitored by the temperature measuring element 152, so that the temperature of the steam output by the heat exchange assembly 120 is adjusted. It is understood that the opening degree of the flow valve 151 may be automatically adjusted according to the actual temperature of the steam detected by the temperature measuring element 152, or the opening degree of the flow valve 151 may be manually adjusted.

In an embodiment of the present application, the steam generator 100 capable of reducing the temperature difference of steam further includes a controller electrically connected to the temperature measuring element 152 and the flow valve 151, and 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 back the data of the actual temperature to the controller. After the corresponding temperature measuring element 152 of each heat exchange assembly 120 feeds back the corresponding actual temperature to the controller, the controller compares the data of each actual temperature, and selects out the data of lower or higher temperature, and controls the corresponding flow valve 151 to adjust the opening.

That is, in this embodiment, the controller and the temperature measuring element 152 are electrically connected with the flow valve 151, so that the real-time on-line adjustment of the water supply flow rate of the different heat exchange assemblies 120 can be realized, so that the temperature of the steam delivered to the steam output assembly 140 by each heat exchange assembly 120 is balanced, and the temperature difference is reduced.

Of course, in another embodiment of the present application, the opening of the flow valve 151 is manually adjusted. The steam generator 100 capable of reducing the steam temperature difference is subjected to simulation tests under different working conditions in advance, and parameters detected by the temperature measuring element 152 in the steam generator 100 capable of reducing the steam temperature difference, the opening degree of the flow valve 151 and other related parameters are fixed through the tests. In this way, when the steam generator 100 capable of reducing the steam temperature difference is in actual use, the opening degree of the flow valve 151 can be adjusted according to the working condition of the steam generator 100 capable of reducing the steam temperature difference, so that the temperature balance of the steam conveyed to the steam output assembly 140 by each heat exchange assembly 120 can be ensured.

Illustratively, the flow valve 151 has a plurality of opening steps, one for each temperature interval of the heat exchange assembly 120, and the opening step is selected according to the actual temperature detected by the temperature measuring element 152. That is, the opening degree of the flow valve 151 is divided into a plurality of different opening degree gears, one opening degree gear is corresponding to each temperature interval of the steam output by the heat exchange assembly 120, and the corresponding flow valve 151 may be adjusted according to the temperature of the steam output by the heat exchange assembly 120.

Of course, in other embodiments of the present application, the user may also adjust the opening of the flow valve 151 in real time according to the actual use requirement.

Referring to FIG. 1, in one embodiment, steam delivery assembly 140 includes a steam header 142 and a steam tube plate 141, one end of steam tube plate 141 is connected to each heat exchange assembly 120, the other end of steam tube plate 141 is connected to steam header 142, and a temperature sensing element 152 is disposed on steam tube plate 141. A steam tube plate 141 is disposed in the steam outlet 114, the steam tube plate 141 connecting each heat exchange assembly 120 with a steam header 142. Each heat exchange assembly 120 is capable of delivering heat exchanged steam into a steam tube plate 141, converging the steam through the steam tube plate 141, delivering the steam into a steam header 142, and outputting main steam through the steam header 142.

It will be appreciated that the heat exchange assembly 120 is connected to the steam tube plate 141 by connecting tubes. The steam tube plate 141 has a plurality of sets of transfer channels 1411, one end of each set of transfer channels 1411 being in communication with a transfer tube of one heat exchange assembly 120, and the other end of each set of transfer tubes being in communication with a steam header 142. Each heat exchange assembly 120 delivers steam through a corresponding connecting tube to the delivery channels 1411 of the steam tubesheet 141, and each set of delivery channels 1411 in turn funnels the steam into the steam header 142. Each group of conveying channels 1411 corresponds to at least one temperature measuring element 152, and the temperature of steam in the corresponding conveying channel 1411 is measured by the temperature measuring element 152.

Alternatively, the number of transfer channels 1411 in each set of transfer channels 1411 is one, and the steam of the heat exchange assembly 120 is collected into the steam header 142 by one transfer channel 1411. Of course, in other embodiments of the present application, the number of the conveying channels 1411 in each group of conveying channels 1411 may be plural, one end of the conveying channels 1411 is connected to the conveying pipe of the same heat exchange assembly 120, and the other end of the conveying channels 1411 is connected to the steam header 142, so that steam can be separated, and eddy current loss is reduced.

Alternatively, when the number of the temperature measuring elements 152 is one, one temperature measuring element 152 is disposed at a detection position of the conveying passage 1411, and the detection position is a position capable of directly detecting the actual temperature of the steam conveyed by the heat exchange assembly 120. Of course, in other embodiments of the present application, the number of the temperature measuring elements 152 may be plural, and the plurality of temperature measuring elements 152 are disposed at the end of the group of conveying channels 1411 at intervals, so as to detect the actual temperature of the steam conveyed by the heat exchange assembly 120.

Referring to fig. 1, in one 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 corresponding to one temperature measuring element 152. In this way, the temperature measuring element 152 can adjust the flow rate of the feedwater in the feedwater assembly 130 by controlling the corresponding flow valve 151, thereby adjusting the flow rate of the feedwater into the corresponding heat exchange assembly 120, and realizing the temperature adjustment of the outlet steam.

Of course, in other embodiments of the present application, at least two heat exchange assemblies 120 may be associated with each water supply assembly 130. That is, one water supply assembly 130 supplies water to the plurality of heat exchange assemblies 120, respectively, by the cooperation of one flow valve 151 and one temperature measuring element 152. This can reduce the number of water supply assemblies 130 and flow valves 151, reducing operational and management difficulties.

Referring to fig. 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 housing 110. The water feed tube panel 132 is arranged in the water feed inlet 113 of the housing 110 in such a way that the water feed tube panel 132 is connected to the heat exchange assembly 120 through the housing 110. One end of the water feed pipe 131 is connected to a water source, and the other end of the water feed pipe 131 is connected to a water feed tube panel 132. In this way, the water source delivers water through the water feed pipe 131 to the water feed pipe panel 132 and through the water feed pipe panel 132 into the heat exchange assembly 120.

Referring to fig. 1, in one embodiment, the steam generator 100 capable of reducing the steam temperature difference further includes a main water supply pipe 160, wherein the main water supply pipe 160 connects the water source with each water supply assembly 130. It will be appreciated that, since the number of the water supply assemblies 130 is plural, in order to facilitate connection of the water source to each water supply assembly 130, the steam generator 100 capable of reducing the steam temperature difference according to the present application is added with the main water supply pipe 160, and the main water supply pipe 160 is connected to one end of the water supply pipe 131 of each water supply assembly 130. In this way, water from the water source can be delivered to the main feed pipe 160, and the main feed pipe 160 diverts water therein to the individual feed pipes 131.

Alternatively, the main water feed pipe 160 is circularly disposed. Of course, in other embodiments of the present application, the main water feed pipe 160 may also be polygonal, etc.

Referring to fig. 1 and 3, in an embodiment, the heat exchange assembly 120 includes a central tube 121, an outer sleeve 122 and a heat exchange tube 123, the outer sleeve 122 is sleeved on the central tube 121 and encloses an annular space, the heat exchange tube 123 is disposed 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. Fig. 3 is a partial enlarged view of the steam generator 100 at B, which can reduce the steam temperature difference, shown in fig. 1.

The central tube 121 and the outer jacket tube 122 provide an installation space for the heat exchange tube 123 such that the heat exchange tube 123 is reliably fixed in the housing 110. The central tube 121 is disposed in the outer sleeve 122 with a certain distance from the outer sleeve 122. In this way, an annular space can be defined between the center tube 121 and the outer sleeve 122. Heat exchange tubes 123 are located in the annular space. One end of the heat exchange tube 123 is connected to the feed tube plate 132 of the feed water assembly 130, and the other end is connected to the steam tube plate 141 of the steam output assembly 140 through a connection pipe. In this way, the water supply pipe plate 132 can convey water into the heat exchange pipe 123, and at the same time, the heat source can contact with the outer wall of the heat exchange pipe 123 after entering the housing 110, so that the heat exchange between the water and the heat source is realized, and the water absorbs heat and turns into steam to enter the steam pipe plate 141.

Optionally, the heat exchange assembly 120 includes a support frame, which is disposed between the central tube 121 and the outer sleeve 122, and is configured to connect the central tube 121 and the outer sleeve 122, and further configured to connect the heat exchange tube 123. Optionally, the heat exchange tubes 123 are plural, and the plural heat exchange tubes 123 are disposed in the annular space at intervals. Of course, in other embodiments of the present application, the number of heat exchange tubes 123 may also be one. Optionally, the steam generator 100 capable of reducing steam temperature difference further includes a mounting seat disposed in the housing 110, and the outer sleeve 122 is fixedly connected to the mounting seat, so that the heat exchange assembly 120 is fixed in the housing 110 through the mounting seat.

The heat exchange tube 123 may be a straight tube or a spiral tube. In addition, when the heat exchange tube 123 is a spiral tube, the spiral tube may be wound clockwise or counterclockwise. When there are a plurality of heat exchange tubes 123, the plurality of heat exchange tubes 123 may be on one cylindrical surface or on a plurality of cylindrical surfaces.

Referring to fig. 1 and 2, in the present embodiment, the steam generator 100 capable of reducing steam temperature difference further includes a main water feeding pipe 160, the steam output assembly 140 includes a steam header 142 and a steam tube plate 141, the water feeding assembly 130 includes a water feeding pipe 131 and a water feeding pipe plate 132, the heat exchange assembly 120 includes a central pipe 121, an outer sleeve 122 and a heat exchange pipe 123, the outer sleeve 122 is sleeved on the central pipe 121 and encloses an annular space, the heat exchange pipe 123 is disposed in the annular space, each water feeding assembly 130 corresponds to one heat exchange assembly 120, one end of the water feeding pipe 131 is connected to the water feeding pipe plate 132, the other end of the water feeding 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 disposed on the steam tube plate 141.

The heat source enters the housing 110 through the heat source inlet 111, exchanges heat with the heat exchange tube 123, releases heat, and flows out through the heat source outlet 112. The water feed pipe 131 feeds water to the heat exchange pipe 123 through the water feed pipe plate 132, and the water absorbs heat to become steam and enters the steam pipe plate 141. The heat source is a primary loop heat exchange medium, and the water is a secondary loop heat exchange medium. Namely, the primary heat exchange medium enters the steam generator 100 capable of reducing the steam temperature difference from the heat source inlet 111, and after heat exchange is completed between the heat exchange tube 123 and the secondary heat exchange medium, the primary heat exchange medium flows out of the steam generator 100 capable of reducing the steam temperature difference from the heat source outlet 112. The two-loop heat exchange medium flows into each heat exchange tube 123 of the corresponding heat exchange assembly 120 from the water tube plate 132, and after heat exchange with the one-loop heat exchange medium, the two-loop heat exchange medium enters the steam header 142 through the steam tube plate 141 so as to flow out of the steam generator 100 capable of reducing the steam temperature difference.

According to the steam generator 100 capable of reducing the steam temperature difference, the flow valve 151 and the temperature measuring element 152 are matched to realize controllable adjustment of different water supply flow distribution in the heat exchange assembly 120, so that the temperature difference and the thermal stress of the steam tube plate 141 are reduced. The temperature measuring element 152 can monitor and obtain real-time temperature data of steam output by the corresponding heat exchange assembly 120 in the steam tube plate 141 in real time, the flow valve 151 can feed back and adjust the opening of the flow valve 151 in a manual or automatic mode, so as to control the water supply 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 transmitted by different heat exchange assemblies 120 in the steam tube plate 141, and balancing the temperature of each steam in the steam header 142.

Moreover, on the premise of controllable adjustment of the water supply flow, the out-of-pile thermal state verification test of the heat exchange assembly 120 can be used for more effectively verifying and migrating the actual service state of the module. Meanwhile, the steam generator 100 capable of reducing the steam temperature difference can enhance the service capacity of the steam generator 100 capable of reducing the steam temperature difference under different working conditions by adjusting the water supply flow under different incoming flow states (flow, temperature and the like), ensure the service safety and the structural integrity of the steam generator 100 capable of reducing the steam temperature difference, obtain a large amount of steam with uniform quality, and prolong the service life of the steam generator 100 capable of reducing the steam temperature difference.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.

Claims (10)

1. A steam generator for reducing a temperature difference of steam, comprising:

the shell is provided with a hollow accommodating cavity, a heat source inlet, a heat source outlet, a water supply inlet and a steam outlet, and the heat source inlet, the heat source outlet, the water supply inlet and the steam outlet are arranged in the shell and are respectively communicated with the accommodating cavity;

the heat exchange assemblies are arranged in the accommodating chamber at intervals;

the water supply assemblies are positioned on the outer side of the shell, and one end of each water supply assembly passes through the water supply inlet of the shell and is communicated with at least one heat exchange assembly;

the steam output assembly is arranged at the steam outlet and is connected with the heat exchange assembly; and

and each adjusting assembly corresponds to one water supply assembly and is used for adjusting the water supply flow in the corresponding water supply assembly.

2. The steam generator of claim 1, wherein the adjustment assembly comprises a flow valve disposed in the feedwater assembly, the flow valve being adjustable in opening to adjust the feedwater flow in the feedwater assembly.

3. The steam generator of claim 2, wherein the conditioning assembly further comprises a temperature sensing element disposed in the steam output assembly for sensing an actual temperature of the output steam of the corresponding heat exchange assembly.

4. The steam generator of claim 3, further comprising a controller electrically connecting the temperature sensing element and the flow valve, the controller controlling the opening of the flow valve based on the actual temperature sensed by the temperature sensing element;

or the flow valve is provided with a plurality of opening gears, each temperature interval of the heat exchange assembly corresponds to one opening gear, and the opening gears are selected according to the actual temperature detected by the temperature measuring element.

5. A steam generator capable of reducing steam temperature difference according to 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 heat exchange assembly, 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 steam generator of any one of claims 1 to 5, wherein each of the feedwater assemblies corresponds to one of the heat exchange assemblies, or wherein each of the feedwater assemblies corresponds to at least two of the heat exchange assemblies.

7. The steam generator of any one of claims 1 to 5, wherein the water supply assembly comprises a water supply pipe and a water supply pipe plate, one end of the water supply pipe is connected to the water supply pipe plate, and the water supply pipe plate is connected to the heat exchange assembly through the housing.

8. The steam generator of any one of claims 1 to 5, further comprising a main water feed pipe connecting a water source to each of the water feed assemblies.

9. The steam generator of any one of claims 1 to 5, wherein the heat exchange assembly comprises a central tube, an outer sleeve and a heat exchange tube, the outer sleeve is sleeved on the central tube and encloses an annular space, the heat exchange tube is arranged in the annular space, one end of the heat exchange tube is connected with the water supply assembly, and the other end of the heat exchange tube is connected with the steam output assembly.

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