Primary-secondary micro-overheating spherical heat accumulator

Abstract

The utility model belongs to the technical field of steam equipment, and relates to a mother-son type micro-overheating spherical heat accumulator which comprises a spherical tank body, a steam outlet mother pipe and a heat exchanger, one end of the steam outlet mother pipe is connected with the spherical tank body, and the other end of the steam outlet mother pipe is connected with a heat exchanger steam inlet of the heat exchanger so that steam in the spherical tank body can be conveyed into the heat exchanger. The heat exchanger is arranged outside the spherical tank body; the heat exchanger is provided with a steam pipeline and a high-temperature saturated water pipeline which are used for indirect heat exchange, the two ends of the steam pipeline are connected with a heat exchanger steam inlet and a heat exchanger steam outlet respectively, and the two ends of the high-temperature saturated water pipeline are both communicated with a cavity of the spherical tank body. And therefore, high-temperature saturated water in the cavity of the spherical tank body enters the heat exchanger to indirectly exchange heat with steam. According to the utility model, the heat exchanger is arranged outside the spherical tank body, so that the heat exchanger does not occupy the internal space of the spherical tank body, and the difficulty of installation, construction and maintenance is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of steam equipment and relates to a mother-and-child type micro-superheated spherical heat accumulator. Background Art

[0002] In the steel industry, spherical heat accumulators are often used after the converter waste heat boiler. Through this heat accumulator, the intermittently generated saturated steam can be collected, stored and released smoothly when needed, converted into a continuous supply of steam flow to meet process needs.

[0003] Since the outlet steam of the converter waste heat boiler is saturated steam with high water content and difficult to use, some current spherical heat accumulators use micro-superheating to overcome the above disadvantages. For example, a Chinese patent with announcement number CN206974230U discloses a transformer-type spherical heat accumulator with micro-superheating, in which a heat pipe heat exchanger is inserted inside the heat accumulator, and the outlet steam is heated by high-temperature and high-pressure saturated water to meet the superheat requirement.

[0004] However, due to the large diameter of the heat pipe heat exchanger and the large diameter of the opening of the heat accumulator shell, the local stress at the opening is large, so it is necessary to increase the thickness of the spherical shell to ensure the structural strength, which increases the investment cost. At the same time, since the heat pipe heat exchanger needs to be inserted into the spherical shell, it is easy to interfere with the internal device of the heat accumulator and occupy a certain internal space, so there are certain requirements for the volume of the sphere. Moreover, this structural design has high requirements for the control of the liquid level. When the liquid level in the heat accumulator drops to a certain level, the heat pipe of the heat exchanger cannot contact the high-temperature water, which in turn affects the normal function of the micro-superheating function. In addition, since the heat pipe heat exchanger relies on gravity to drive the internal working fluid circulation, there are strict restrictions on the inclined installation angle of the heat exchanger. If the installation angle is improper, it may cause the working fluid circulation to be blocked, reduce the heat transfer efficiency of the heat pipe heat exchanger, or even make it unable to work normally. Therefore, this type of heat exchanger has high installation accuracy requirements, which increases the difficulty of construction and maintenance. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a mother-and-child type micro-superheated spherical heat accumulator to solve the technical problems raised in the background technology.

[0006] In order to achieve the above object, the utility model provides the following technical solutions:

[0007] A mother-child type micro-superheated spherical heat accumulator, comprising a spherical tank body, a steam outlet main pipe and a heat exchanger, one end of the steam outlet main pipe is connected to the spherical tank body, and the other end is connected to the heat exchanger steam inlet of the heat exchanger to transport the steam in the spherical tank body to the heat exchanger, and the heat exchanger is arranged outside the spherical tank body;

[0008] The heat exchanger has a steam pipe for indirect heat exchange and a high-temperature saturated water pipe. The two ends of the steam pipe are respectively connected to the steam inlet and the steam outlet of the heat exchanger. The two ends of the high-temperature saturated water pipe are connected to the cavity of the spherical tank body, so that the high-temperature saturated water in the cavity of the spherical tank body enters the heat exchanger to exchange heat indirectly with the steam.

[0009] Furthermore, the spherical tank body is provided with a steam-water separation device for separating high-temperature steam from water, and after the steam-water separation device separates the high-temperature steam, the steam is discharged through the steam outlet main pipe, and the high-temperature saturated water remains inside the spherical tank body.

[0010] Furthermore, a Laval nozzle for throttling and reducing pressure and a pressure regulating valve group for regulating pressure are provided on the steam outlet mother pipe, and the pressure regulating valve group is arranged at one end close to the heat exchanger.

[0011] Furthermore, there is at least one heat exchanger.

[0012] Furthermore, steam collecting chambers are provided between both ends of the heat exchanger and the steam inlet and the steam outlet of the heat exchanger;

[0013] The steam collecting chamber is formed by partitions arranged at both ends of the inner cavity of the heat exchanger and the cavity partitions at both ends of the heat exchanger. The channel between the two partitions serves as a high-temperature saturated water pipeline, and a plurality of connected thin tubes are provided between the two partitions as steam pipelines.

[0014] Furthermore, the heat exchanger is a shell and tube heat exchanger or a plate heat exchanger.

[0015] Furthermore, an independent bracket independent of the spherical tank body is provided on the outside of the heat exchanger to support the heat exchanger.

[0016] Furthermore, the steam outlet of the heat exchanger is connected to a user pipeline network.

[0017] The process flow of the mother-child micro-superheated spherical heat accumulator includes the following steps:

[0018] S1. The saturated steam at the outlet of the spherical tank body is throttled and adiabatically expanded through the Laval nozzle to become steam with a certain degree of superheat;

[0019] S2. Then the pressure is adjusted by the pressure regulating valve group and then enters the heat exchanger;

[0020] S3. The saturated steam and the high-temperature and high-pressure hot water in the spherical tank body are indirectly exchanged in the heat exchanger to become superheated steam with a superheat of 10℃-20℃;

[0021] S4. The superheated steam is sent to the user's pipeline network through the steam outlet of the heat exchanger.

[0022] The beneficial effects of the utility model are:

[0023] The utility model provides a mother-and-child type micro-superheated spherical heat accumulator. By arranging the heat exchanger outside the spherical tank body, the heat exchanger does not occupy the internal space of the sphere, so that the overall heat storage space of the spherical tank body is larger; and the external heat exchanger is provided with an independent bracket, which does not rely on the spherical shell of the spherical tank body to support the load, thereby improving the stress of the spherical shell and reducing the thickness of the spherical shell.

[0024] When designing the structure, the interface position between the high-temperature saturated water channel in the heat exchanger and the spherical tank body can be adjusted to adapt to the changes in the requirements of the spherical volume and the liquid level height in the spherical tank for different projects, ensuring that the heat exchanger can be immersed in the high-temperature medium even when the liquid level is low, so as to continuously carry out effective heat exchange; and it can convert the intermittently generated steam in the steel industry into continuously generated steam, and at the same time make the output steam have a certain degree of superheat, thereby improving the quality and utilization efficiency of the steam, and having obvious economic benefits.

[0025] Compared with the structural design existing in the prior art, the utility model solves the problem that the heat exchange tubes are exposed to the water surface due to the drop in the liquid level of the spherical tank body, resulting in loss of heat exchange capacity and insufficient superheat, and the independent external arrangement of the heat exchanger is more convenient for inspection and maintenance; and through this external heat exchanger arrangement, the requirements for the installation accuracy of the heat exchanger are greatly reduced, and the difficulty of installation, construction and maintenance is reduced.

[0026] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and research, or can be taught from the practice of the present invention to some extent. The objectives and other advantages of the present invention can be achieved and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be described in detail below in conjunction with the accompanying drawings, in which:

[0028] Figure 1 It is a schematic elevational structural diagram of a mother-and-child type micro-superheated spherical heat accumulator in the utility model;

[0029] Figure 2 The utility model is a schematic diagram of a top view of the structure of a mother-and-child type micro-superheated spherical heat accumulator.

[0030] Figure numerals: 1-spherical tank body; 2-steam-water separation device; 3-spherical tank steam outlet pipe flange interface; 4-steam outlet main pipe; 5-Laval nozzle; 6-pressure regulating valve group; 7-heat exchanger steam inlet; 8-steam collecting chamber; 9-heat exchanger; 10-heat exchanger steam outlet. DETAILED DESCRIPTION

[0031] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. The following embodiments and the features in the embodiments can be combined with each other without conflict.

[0032] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present utility model. In order to better illustrate the embodiments of the present utility model, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0033] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as a limitation on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0034] See also Figure 1-2 It is a mother-and-child type micro-superheated spherical heat accumulator, comprising a spherical tank body 1, a steam outlet main pipe 4 and a heat exchanger 9, one end of the steam outlet main pipe 4 is connected to the spherical tank body 1 through a spherical tank steam outlet pipe flange interface 3 arranged on the spherical tank body 1, and the other end is connected to the heat exchanger steam inlet 7 of the heat exchanger 9, and a Laval nozzle 5 for throttling and reducing pressure and a pressure regulating valve group 6 for regulating pressure are arranged on the steam outlet main pipe 4, and the heat exchanger 9 is arranged outside the spherical tank body 1.

[0035] A steam-water separation device 2 for separating high-temperature steam from water is arranged inside the spherical tank body 1. After the high-temperature steam is separated by the steam-water separation device 2, the steam is discharged through the steam outlet main pipe 4, and the high-temperature saturated water remains inside the spherical tank body 1; the steam-water separation device 2 is a conventional device in the prior art, so it is not described in detail.

[0036] Specifically, the heat exchanger 9 has a steam pipe for indirect heat exchange and a high-temperature saturated water pipe. The two ends of the steam pipe are respectively connected to the heat exchanger steam inlet 7 and the heat exchanger steam outlet 10. Both ends of the high-temperature saturated water pipe are connected to the cavity of the spherical tank body 1, so that the high-temperature saturated water in the cavity of the spherical tank body 1 enters the heat exchanger 9 to indirectly exchange heat with the steam.

[0037] Specifically, the heat exchanger steam outlet 10 of the heat exchanger 9 is connected to the user pipeline network, and a steam collecting chamber 8 is provided at both ends of the heat exchanger 9 and between the heat exchanger steam inlet 7 and the heat exchanger steam outlet 10; the steam collecting chamber 8 is formed by partitions arranged at both ends of the heat exchanger 9 and the cavity partitions at both ends of the heat exchanger 9, and a number of interconnected thin tubes are provided between the two partitions as steam pipes, and the channel between the two partitions is used as a high-temperature saturated water pipe, thereby realizing indirect heat exchange between steam and high-temperature saturated water.

[0038] The working process of the mother-and-child type micro-superheated spherical heat accumulator is as follows: the high-temperature steam in the spherical tank body 1 is separated into high-temperature saturated water and steam through the internal device 2, the steam is throttled and reduced in pressure through the steam outlet main pipe 4 and the Laval nozzle 5, and then enters the pressure regulating valve group 6 to adjust the pressure, and then enters the heat exchanger 9 through the heat exchanger steam inlet 7, and after indirect heat exchange with the high-temperature saturated water in the spherical tank body 1 in the heat exchanger 9, it is sent to the user pipeline network through the heat exchanger steam outlet 10, and finally the purpose of steam micro-superheating is achieved through the external heat exchanger 9.

[0039] In other embodiments, the heat exchanger 9 may be configured as a shell and tube heat exchanger or a plate heat exchanger.

[0040] Preferably, an independent bracket independent of the spherical tank body 1 is provided on the outside of the heat exchanger 9 so that the heat exchanger 9 does not rely on the spherical shell for support.

[0041] In another embodiment, the heat exchanger 9 is provided in plurality, and all are connected to the spherical tank body 1 through the steam outlet main pipe 4. And in this embodiment, the heat exchanger 9 is preferably two.

[0042] The mother-and-child type transformer type micro-superheated spherical heat accumulator in the utility model utilizes an external heat exchanger to superheat the outlet steam of the spherical tank body 1, thereby improving the low-quality state of saturated steam with water, which is beneficial to the long-distance transmission of steam; compared with the micro-superheated heat accumulator with a built-in heat pipe heat exchanger, the utility model can avoid the heat exchanger occupying the internal heat storage volume of the spherical tank body 1, thereby reducing the wall thickness of the spherical shell, reducing the weight of the spherical shell, and reducing the load borne by the pillars, thereby reducing investment;

[0043] In addition, the external heat exchanger is easy to install and maintain; it is connected to the spherical tank body 1 through a high-temperature saturated water pipeline, which enhances the adaptability of the heat exchanger to the liquid level changes in the spherical tank body 1, and can select a suitable installation position for the heat exchanger 9 according to the lowest liquid level of the spherical tank body 1, without being limited to the structure of the spherical tank body 1 itself, thereby being able to adapt to heat exchange conditions under lower liquid levels.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A mother-and-child type micro-superheated spherical heat accumulator, characterized in that: It includes a spherical tank body, a steam outlet main pipe and a heat exchanger, one end of the steam outlet main pipe is connected to the spherical tank body, and the other end is connected to the heat exchanger steam inlet of the heat exchanger to transport the steam in the spherical tank body to the heat exchanger, and the heat exchanger is arranged outside the spherical tank body; The heat exchanger has a steam pipe for indirect heat exchange and a high-temperature saturated water pipe. The two ends of the steam pipe are respectively connected to the steam inlet and the steam outlet of the heat exchanger. The two ends of the high-temperature saturated water pipe are connected to the cavity of the spherical tank body, so that the high-temperature saturated water in the cavity of the spherical tank body enters the heat exchanger to exchange heat indirectly with the steam.

2. The mother-child micro-superheated spherical heat accumulator according to claim 1 is characterized in that: The spherical tank body is provided with a steam-water separation device for separating high-temperature steam from water. After the steam-water separation device separates the high-temperature steam, the steam is discharged through the steam outlet main pipe, and the high-temperature saturated water remains in the spherical tank body.

3. The mother-child micro-superheated spherical heat accumulator according to claim 1 is characterized in that: A Laval nozzle for throttling and reducing pressure and a pressure regulating valve group for regulating pressure are arranged on the steam outlet mother pipe, and the pressure regulating valve group is arranged at one end close to the heat exchanger.

4. The mother-child micro-superheated spherical heat accumulator according to claim 1 is characterized in that: There is at least one heat exchanger.

5. The mother-child micro-superheated spherical heat accumulator according to claim 1 is characterized in that: Steam collecting chambers are provided at both ends of the heat exchanger and between the steam inlet and the steam outlet of the heat exchanger; The steam collecting chamber is formed by partitions arranged at both ends of the inner cavity of the heat exchanger and the cavity partitions at both ends of the heat exchanger. The channel between the two partitions serves as a high-temperature saturated water pipeline, and a plurality of connected thin tubes are provided between the two partitions as steam pipelines.

6. The mother-child micro-superheated spherical heat accumulator according to claim 1 is characterized in that: The heat exchanger is a shell and tube heat exchanger or a plate heat exchanger.

7. The mother-child micro-superheated spherical heat accumulator according to claim 1 is characterized in that: An independent bracket independent of the spherical tank body is arranged on the outside of the heat exchanger to support the heat exchanger.

8. The mother-and-child micro-superheated spherical heat accumulator according to claim 1 is characterized in that: The steam outlet of the heat exchanger is connected to the user pipeline network.

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