A two-stage heat exchange type ammonia stripping and shrinking unit

Abstract

This application provides a two-stage heat exchange ammonia vaporizer, relating to the field of vaporizer technology. It includes a shell, which is a hollow structure with openings at the top and bottom. Inside the shell are a first heat exchange tube and a second heat exchange tube, with the first heat exchange tube located below the second. Both ends of the first and second heat exchange tubes extend out of the shell. A first flange is located at the upper end of the shell, and a second flange is located at the lower end. The two-stage heat exchange ammonia vaporizer provided by this invention employs a segmented heat exchange method. In use, a mixture of ammonia gas and water vapor enters the shell from the lower end. A heat-collecting medium is introduced into the first heat exchange tube, and cooling water is introduced into the second heat exchange tube. As the mixture rises, it first contacts and exchanges heat with the first heat exchange tube, achieving heat energy recovery. As the ammonia continues to rise, it contacts and exchanges heat with the second heat exchange tube. Because the ammonia temperature decreases, the amount of cooling water used is reduced.

Description

Technical Field

[0001] This application relates to the field of ammonia separator technology, and more specifically, to a two-stage heat exchange ammonia stripping separator. Background Technology

[0002] The common process for ammonia stripping is as follows: raw ammonia water, after heat exchange with ammonia stripping wastewater, enters the ammonia stripping tower. Steam is introduced at the bottom of the tower, and ammonia vapor evaporated at the top is condensed and sent to the ammonia treatment unit. The low-concentration ammonia stripping wastewater discharged from the bottom of the tower is sent to subsequent treatment processes. The ammonia stripping separator is located at the top of the ammonia stripping tower. Ammonia gas flows inside the pipes, and circulating cooling water flows between the pipes. Its main function is to cool the ammonia gas and water vapor from the condensing ammonia stripping tower, so that the condensate flows back into the ammonia stripping tower, thereby increasing the ammonia concentration. However, conventional separators consume a large amount of cooling water and do not effectively utilize the high-temperature heat source of the ammonia stripping tower, resulting in significant waste. Summary of the Invention

[0003] The purpose of this application is to provide a two-stage heat exchange ammonia stripping and shrinking unit, which can solve the technical problems of large cooling consumption and heat energy waste in existing shrinking units.

[0004] This application provides a two-stage heat exchange ammonia stripping and shrinking unit, including a shell. The shell is a hollow structure with openings at the top and bottom. A first heat exchange tube and a second heat exchange tube are arranged inside the shell. The first heat exchange tube is located below the second heat exchange tube. Both ends of the first heat exchange tube and both ends of the second heat exchange tube extend out of the shell. A first flange is provided at the upper end of the shell, and a second flange is provided at the lower end of the shell.

[0005] Preferably, the outer casing includes a first shell, a second shell, a third shell, and a fourth shell arranged sequentially from bottom to top. The second flange is disposed at the lower end of the first shell, the first heat exchange tube is disposed inside the second shell, the second heat exchange tube is disposed inside the third shell, and the first flange is disposed at the upper end of the fourth shell.

[0006] Preferably, both the first housing and the fourth housing are inverted funnel-shaped structures.

[0007] Preferably, a third flange is provided at the upper end of the first housing, a fourth flange is provided at the lower end of the second housing, and the second housing and the first housing are connected by a flange. A fifth flange is provided at the upper end of the second housing, a sixth flange is provided at the lower end of the third housing, and the third housing and the second housing are connected by a flange. A seventh flange is provided at the upper end of the third housing, and an eighth flange is provided at the lower end of the fourth housing, and the fourth housing and the third housing are connected by a flange.

[0008] Preferably, both the first heat exchange tube and the second heat exchange tube are tube-and-tube structures.

[0009] The beneficial effects of this utility model are:

[0010] The two-stage heat exchange ammonia vaporizer provided by this utility model adopts a staged heat exchange method. In use, a mixture of ammonia and water vapor enters the interior of the shell from the lower end of the shell. The heat collection medium is introduced into the interior of the first heat exchange tube, and cooling water is introduced into the interior of the second heat exchange tube. During the ascent, the mixture of ammonia and water vapor first contacts the first heat exchange tube and exchanges heat, realizing the recovery and utilization of heat energy. After the ammonia continues to rise, it will contact the second heat exchange tube and exchange heat. Since the temperature of the ammonia is reduced after one heat exchange, the amount of cooling water used is reduced. Attached Figure Description

[0011] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] The reference numerals in the attached figures are as follows:

[0014] 1. Outer shell; 2. First heat exchange tube; 3. Second heat exchange tube; 4. First flange; 5. Second flange; 6. First shell; 7. Second shell; 8. Third shell; 9. Fourth shell; 10. Third flange; 11. Fourth flange; 12. Fifth flange; 13. Sixth flange; 14. Seventh flange; 15. Eighth flange. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0017] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0018] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0020] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0021] Example

[0022] like Figure 1 As shown in the figure, this application embodiment provides a two-stage heat exchange ammonia stripping and shrinking device, including a shell 1. The shell 1 is a hollow structure with openings at the top and bottom. A first heat exchange tube 2 and a second heat exchange tube 3 are arranged inside the shell 1. The first heat exchange tube 2 is located below the second heat exchange tube 3. Both ends of the first heat exchange tube 2 and both ends of the second heat exchange tube 3 extend out of the shell 1. A first flange 4 is provided at the upper end of the shell 1. The shell 1 is connected to the ammonia stripping tower through a flange. A second flange 5 is provided at the lower end of the shell 1. The shell 1 is connected to the ammonia treatment device through a flange. The flange connection can ensure the sealing effect and prevent ammonia from overflowing.

[0023] In use, a mixture of ammonia and water vapor enters the interior of the outer shell 1 from the lower end. A heat-collecting medium (hot water at 60℃~70℃) is introduced into the first heat exchange tube 2, and cooling water is introduced into the second heat exchange tube 3. As the mixture rises, it first contacts and exchanges heat with the first heat exchange tube 2, resulting in a heat-collecting medium with a temperature of 70℃~80℃. This heat-collecting medium can then be used as a heat source for winter heating, refrigeration, and other devices requiring low-temperature heat sources, thus achieving heat energy recovery and utilization. As the ammonia continues to rise, it contacts and exchanges heat with the second heat exchange tube 3. Because the temperature of the ammonia decreases after one heat exchange, the amount of cooling water used is reduced. The ammonia with increased concentration is discharged from the upper end of the outer shell 1 and sent to the ammonia treatment device.

[0024] In this embodiment, the outer shell 1 includes a first shell 6, a second shell 7, a third shell 8 and a fourth shell 9 arranged sequentially from bottom to top. The second flange 5 is disposed at the lower end of the first shell 6, the first heat exchange tube 2 is disposed inside the second shell 7, the second heat exchange tube 3 is disposed inside the third shell 8, and the first flange 4 is disposed at the upper end of the fourth shell 9.

[0025] In this embodiment, both the first shell 6 and the fourth shell 9 are inverted funnel-shaped structures. The inverted funnel-shaped first shell 6 is used to increase the gas flow rate at the inlet and enhance turbulence, thereby improving heat transfer efficiency. The inverted funnel-shaped fourth shell 9 can smoothly guide the gas outflow and avoid eddies and energy dissipation caused by sudden expansion.

[0026] In this embodiment, a third flange 10 is provided at the upper end of the first housing 6, a fourth flange 11 is provided at the lower end of the second housing 7, and the second housing 7 is connected to the first housing 6 by a flange. A fifth flange 12 is provided at the upper end of the second housing 7, a sixth flange 13 is provided at the lower end of the third housing 8, and the third housing 8 is connected to the second housing 7 by a flange. A seventh flange 14 is provided at the upper end of the third housing 8, and an eighth flange 15 is provided at the lower end of the fourth housing 9, and the fourth housing 9 is connected to the third housing 8 by a flange. The flange connection between the first housing 6 and the second housing 7, between the second housing 7 and the third housing 8, and between the third housing 8 and the fourth housing 9 can ensure a sealing effect and allow for disassembly of each part, thereby facilitating regular inspection and maintenance of the first heat exchange tube 2, the second heat exchange tube 3, the first housing 6, the second housing 7, the third housing 8, and the fourth housing 9.

[0027] In this embodiment, both the first heat exchange tube 2 and the second heat exchange tube 3 are tube-and-shell tubes. Tube-and-shell tubes have advantages such as simple structure, strong adaptability, high heat exchange efficiency, and are easy to maintain and repair.

[0028] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A two-stage heat exchanging ammonia desublimator characterized by: The device includes an outer shell, which is a hollow structure with openings at the top and bottom. Inside the outer shell, a first heat exchange tube and a second heat exchange tube are arranged. The first heat exchange tube is located below the second heat exchange tube. Both ends of the first heat exchange tube and both ends of the second heat exchange tube extend out of the outer shell. A first flange is provided at the upper end of the outer shell, and a second flange is provided at the lower end of the outer shell.

2. A two-stage heat exchanging ammonia decompression column according to claim 1, characterized in that: The outer casing includes a first shell, a second shell, a third shell, and a fourth shell arranged sequentially from bottom to top. The second flange is located at the lower end of the first shell, the first heat exchange tube is located inside the second shell, the second heat exchange tube is located inside the third shell, and the first flange is located at the upper end of the fourth shell.

3. A two-stage heat exchanging ammonia decompression column according to claim 2, characterized in that: Both the first shell and the fourth shell are inverted funnel-shaped structures.

4. A two-stage heat exchanging ammonia decompression column according to claim 3, characterized in that: The first housing has a third flange at its upper end, the second housing has a fourth flange at its lower end, and the second housing and the first housing are connected by a flange. The second housing has a fifth flange at its upper end, the third housing has a sixth flange at its lower end, and the third housing and the second housing are connected by a flange. The third housing has a seventh flange at its upper end, and the fourth housing has an eighth flange at its lower end, and the fourth housing and the third housing are connected by a flange.

5. A two-stage heat exchanging ammonia stripper according to claim 4, characterized in that: Both the first heat exchange tube and the second heat exchange tube are tube-and-tube structures.

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