Quenching heat exchanger
By designing sewage pipes and exhaust pipes in the quench heat exchanger, the sewage holes and exhaust holes are located at specific locations on the first slope and the second slope respectively, the corrosion and overheating problems caused by dirt and water vapor accumulation in the traditional quench heat exchanger are solved, and the effect of reducing the risk of corrosion and overheating is achieved.
Patent Information
- Application Number
- CN202421646081.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-12
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-07-12
AI Technical Summary
In traditional quench heat exchangers, dirt and impurities are easily accumulated on the upper surface of the lower tube plate, resulting in corrosion problems; water vapor is easily accumulated on the lower surface of the upper tube plate, resulting in local overheating and damage.
A quench heat exchanger is designed, and the first pipe plate and the second pipe plate are arranged in the shell at intervals from bottom to top, and a sewage pipe and an exhaust pipe are provided. The sewage hole is located at the lowest point of the first slope, and the exhaust hole is located at the highest point of the second slope. Dirt and impurities enter the sewage pipe through the sewage hole, and water vapor enters the exhaust pipe through the exhaust hole to avoid dirt and water vapor accumulation and gathering on the slope.
It effectively reduces the chance of corrosion of the first slope surface and the chance of damage of the second slope surface due to local overheating, and extends the service life of the equipment.
Smart Images
Figure CN222783969U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of heat exchangers, in particular to a rapid cooling heat exchanger. Background Art
[0002] The quench heat exchanger is a key equipment with strong processability in the ethylene cracking unit. The quench heat exchanger mainly undertakes two tasks: one is to quickly cool the high-temperature cracking gas of about 800℃ to below the secondary reaction temperature to reduce olefin losses; the other is to recover as much high-level heat energy of the cracking gas as possible to generate high-pressure steam of about 14MPa.
[0003] The quench heat exchanger usually includes a shell, an upper tube sheet, a lower tube sheet and a heat exchange tube, wherein the upper tube sheet and the lower tube sheet are both arranged in the shell and the interior of the shell is divided into a saturated water area and two cracked gas areas located on the upper and lower sides of the saturated water area. The heat exchange tube is arranged in the saturated water area and is connected to the two cracked gas areas respectively. The high-temperature cracked gas flows in the heat exchange tube, and the saturated water flows in the saturated water area. The saturated water absorbs the heat of the high-temperature cracked gas to generate water vapor. The traditional upper tube sheet and the lower tube sheet are both horizontal plate structures, so the upper surface of the lower tube sheet is prone to accumulation of dirt and impurities, which causes the problem of corrosion of the lower tube sheet; the lower surface of the upper tube sheet is prone to accumulate water vapor. After the quench heat exchanger has been running for a long time, the temperature of the accumulated water vapor continues to rise, which causes the problem of damage to the upper tube sheet due to local overheating.
[0004] Therefore, it is urgent to propose a rapid cooling heat exchanger to solve the above technical problems. Utility Model Content
[0005] The utility model aims to provide a rapid cooling heat exchanger, which can reduce the probability of a first slope surface being corroded and the probability of a second slope surface being damaged due to local overheating.
[0006] To achieve this purpose, the utility model adopts the following technical solutions:
[0007] A quench heat exchanger, cracked gas and saturated water can exchange heat in the quench heat exchanger, the quench heat exchanger comprising:
[0008] a housing, the housing comprising a first region;
[0009] A first tube sheet and a second tube sheet, the first tube sheet and the second tube sheet are arranged in the shell in a spaced relationship from bottom to top, the first tube sheet, the second tube sheet and the inner wall of the shell enclose a first area, and saturated water can flow in the first area;
[0010] A sewage pipe, wherein a sewage hole is provided on the first tube sheet, a surface of the first tube sheet facing the first region is a first slope surface, and the sewage hole is located at the lowest point of the first slope surface, and the sewage pipe is connected to the sewage hole;
[0011] The exhaust pipe is provided with an exhaust hole on the second tube plate, the surface of the second tube plate facing the first area is a second slope surface, and the exhaust hole is located at the highest point of the second slope surface, and the exhaust pipe is connected with the exhaust hole.
[0012] Optionally, the slope angle of the first slope is a, a>2°;
[0013] And / or, the slope angle of the second slope is b, and b>2°.
[0014] Optionally, the drain hole is located at the center of the first tube sheet;
[0015] And / or, the exhaust hole is located at the center of the second tube sheet.
[0016] Optionally, the quench heat exchanger further comprises a valve, which is arranged on the sewage pipe and is selectively opened or closed.
[0017] Optionally, the quench heat exchanger also includes a heat exchange tube, which is arranged in the first area, and the shell also includes a second area and a third area, the second area is located on the side of the first tube sheet away from the first area, and the third area is located on the side of the second tube sheet away from the first area, and the second area and the third area are both connected to the heat exchange tube, and the cracked gas can circulate in the second area, the heat exchange tube and the third area.
[0018] Optionally, a sewage pipe is disposed through the side wall of the shell, and one end of the sewage pipe is located in the second area and communicated with the sewage hole;
[0019] The exhaust pipe is arranged through the side wall of the shell, and one end of the exhaust pipe is located in the third area and communicated with the exhaust hole.
[0020] Optionally, the sewage pipe gradually slopes downward in a direction away from the axis of the sewage hole;
[0021] The exhaust pipe gradually tilts upward in a direction away from the axis of the exhaust hole.
[0022] Optionally, the angle between the axis of the sewage pipe and the horizontal plane is c, c>2°;
[0023] And / or, the angle between the axis of the exhaust pipe and the horizontal plane is d, and d>2°.
[0024] Optionally, a surface of the first tube sheet facing the second region is a plane.
[0025] Optionally, the surface of the second tube sheet facing the third region is a plane.
[0026] Beneficial effects of the utility model:
[0027] The rapid cooling heat exchanger provided by the utility model is provided with a sewage pipe and an exhaust pipe, wherein the sewage pipe is connected with the sewage hole on the first tube plate, the surface of the first tube plate facing the first area is a first slope surface, and the sewage hole is located at the lowest point of the first slope surface. When dirt and impurities in the first area fall onto the first slope surface, the dirt and impurities can move to the lowest point on the first slope surface, and then the dirt and impurities enter the sewage pipe through the sewage hole to discharge the dirt and impurities, avoid the accumulation of dirt and impurities on the first slope surface, and reduce the probability of the first slope surface being corroded; in addition, the exhaust pipe is connected with the exhaust hole on the second tube plate, the surface of the second tube plate facing the first area is a second slope surface, and the exhaust hole is located at the highest point of the second slope surface. When water vapor is generated in the first area, the water vapor flows upward to the second slope surface, then moves to the highest point on the second slope surface, and finally enters the exhaust pipe through the exhaust hole to discharge the water vapor, avoid the accumulation of water vapor on the second slope surface, and reduce the probability of the second slope surface being damaged due to local overheating. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a schematic diagram of the partial cross-sectional structure of the quench heat exchanger provided in this embodiment.
[0029] In the figure:
[0030] 100, shell; 110, first area; 120, second area; 130, third area; 200, first tube sheet; 210, drain hole; 220, first slope; 300, second tube sheet; 310, exhaust hole; 320, second slope; 400, drain pipe; 500, exhaust pipe; 600, heat exchange tube. DETAILED DESCRIPTION
[0031] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention, rather than all structures, are shown in the accompanying drawings.
[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0033] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, 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, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.
[0035] This embodiment provides a rapid cooling heat exchanger, in which cracked gas and saturated water can exchange heat. The rapid cooling heat exchanger can reduce the probability of the first slope surface being corroded and the probability of the second slope surface being damaged due to local overheating.
[0036] Specifically, Figure 1 As shown, the quench heat exchanger includes a shell 100, a first tube sheet 200, a second tube sheet 300, a drain pipe 400 and an exhaust pipe 500, wherein the shell 100 includes a first area 110, the first tube sheet 200 and the second tube sheet 300 are arranged in the shell 100 from bottom to top, and the first tube sheet 200, the second tube sheet 300 and the inner wall of the shell 100 enclose the first area 110, and saturated water can flow in the first area 110. A drain hole 210 is provided on the first tube sheet 200, and the surface of the first tube sheet 200 facing the first area 110 is a first slope 220, and the drain hole 210 is located at the lowest point of the first slope 220. The drain pipe 400 is connected to the drain hole 210. An exhaust hole 310 is provided on the second tube sheet 300, and the surface of the second tube sheet 300 facing the first area 110 is a second slope 320, and the exhaust hole 310 is located at the highest point of the second slope 320. The exhaust pipe 500 is connected to the exhaust hole 310.
[0037] Based on the above design, the quench heat exchanger provided in this embodiment is provided with a drain pipe 400 and an exhaust pipe 500, wherein the drain pipe 400 is connected to the drain hole 210 on the first tube sheet 200, the surface of the first tube sheet 200 facing the first area 110 is the first slope 220, and the drain hole 210 is located at the lowest point of the first slope 220. When the dirt and impurities in the first area 110 fall onto the first slope 220, the dirt and impurities can move to the lowest point on the first slope 220, and then the dirt and impurities enter the drain pipe 400 through the drain hole 210 to discharge the dirt and impurities, thereby preventing the dirt and impurities from accumulating on the first slope 220. In addition, the exhaust pipe 500 is connected with the exhaust hole 310 on the second tube sheet 300, and the surface of the second tube sheet 300 facing the first area 110 is the second slope 320, and the exhaust hole 310 is located at the highest point of the second slope 320. When water vapor is generated in the first area 110, the water vapor flows upward to the second slope 320, then moves to the highest point on the second slope 320, and finally enters the exhaust pipe 500 through the exhaust hole 310 to discharge the water vapor, thereby preventing the water vapor from gathering on the second slope 320 and reducing the probability of the second slope 320 being damaged due to local overheating.
[0038] Furthermore, if Figure 1 As shown, the quench heat exchanger also includes a heat exchange tube 600, which is arranged in the first area 110. The shell 100 also includes a second area 120 and a third area 130. The second area 120 is located on the side of the first tube sheet 200 away from the first area 110, and the third area 130 is located on the side of the second tube sheet 300 away from the first area 110. The second area 120 and the third area 130 are both connected to the heat exchange tube 600, and the cracked gas can flow in the second area 120, the heat exchange tube 600 and the third area 130. In the first area 110, the saturated water in the shell 100 absorbs the heat of the cracked gas in the heat exchange tube 600, thereby realizing heat exchange between the saturated water and the cracked gas.
[0039] Furthermore, if Figure 1 As shown, one end of the sewage pipe 400 is located in the second area 120 and communicates with the sewage hole 210 , and the other end of the sewage pipe 400 is penetrated through the side wall of the shell 100 .
[0040] One end of the exhaust pipe 500 is located in the third area 130 and communicates with the exhaust hole 310 , and the other end of the exhaust pipe 500 passes through the side wall of the housing 100 .
[0041] Preferably, if Figure 1As shown, the drain pipe 400 gradually tilts downward in a direction away from the axis of the drain hole 210, so as to facilitate the smooth discharge of dirt and impurities from the drain pipe 400; and the exhaust pipe 500 gradually tilts upward in a direction away from the axis of the exhaust hole 310, so as to facilitate the smooth discharge of water vapor from the exhaust pipe 500.
[0042] Specifically, if Figure 1 As shown, the angle between the axis of the sewage pipe 400 and the horizontal plane is c, c>2°. For example, c can be 2°, 3° or 5°, etc., so that dirt and impurities can be quickly discharged from the sewage pipe 400 and dirt and impurities can be prevented from accumulating in the sewage pipe 400.
[0043] The angle between the axis of the exhaust pipe 500 and the horizontal plane is d, d>2°. For example, d can be 2°, 3° or 5°, etc., so that water vapor can be quickly discharged from the exhaust pipe 500 and avoid water vapor accumulation in the exhaust pipe 500 (even on the second slope 320).
[0044] Alternatively, if Figure 1 As shown, the surface of the first tube sheet 200 facing the second region 120 is a plane, which facilitates the connection between the sewage pipe 400 and the first tube sheet 200 on the one hand, and ensures that the cracked gas flows smoothly between the second region 120 (especially the position close to the first tube sheet 200) and the heat exchange tube 600 on the other hand, thereby avoiding the accumulation of the cracked gas at a certain position on the side of the first tube sheet 200 facing the second region 120, and reducing the probability of damage to the side of the first tube sheet 200 facing the second region 120 due to local overheating.
[0045] Alternatively, if Figure 1 As shown, the surface of the second tube sheet 300 facing the third region 130 is a plane, which facilitates the connection between the exhaust pipe 500 and the second tube sheet 300 on the one hand, and ensures that the cracked gas flows smoothly between the third region 130 (especially the position close to the second tube sheet 300) and the heat exchange tube 600 on the other hand, thereby avoiding the accumulation of the cracked gas at a certain position on the side of the second tube sheet 300 facing the third region 130, and reducing the probability of damage to the side of the second tube sheet 300 facing the third region 130 due to local overheating.
[0046] Alternatively, if Figure 1 As shown, the drain hole 210 is located at the center of the first tube sheet 200, that is, the side of the first tube sheet 200 facing the first area 110 gradually tilts downward from the edge to the center, so that the side of the first tube sheet 200 facing the first area 110 is roughly funnel-shaped, so that the structure of the first tube sheet 200 has better consistency.
[0047] Alternatively, if Figure 1As shown, the exhaust hole 310 is located at the center of the second tube sheet 300, that is, the side of the second tube sheet 300 facing the first area 110 gradually tilts upward from the edge to the center, so that the side of the second tube sheet 300 facing the first area 110 is roughly in the shape of an inverted funnel, so that the structural consistency of the second tube sheet 300 is better.
[0048] It should be pointed out that the drain hole 210 is located at the center of the first tube sheet 200, and the exhaust hole 310 is located at the center of the second tube sheet 300, and the heat exchange tube 600 is arranged in the first area 110. In order to achieve the avoidance of the drain hole 210 and the exhaust hole 310 and the heat exchange tube 600, the heat exchange tube 600 in this embodiment is located at an eccentric position of the first area 110, that is, the heat exchange tube 600 is staggered from the center position of the first tube sheet 200, and the heat exchange tube 600 is staggered from the center position of the second tube sheet 300.
[0049] It is understandable that in other embodiments, the drain hole 210 may also be located at a non-central position of the first tube sheet 200, that is, the surface of the first tube sheet 200 facing the first region 110 is an asymmetric structure, as long as the drain hole 210 is located at the lowest point of the first slope 220. In other embodiments, the exhaust hole 310 may also be located at a non-central position of the second tube sheet 300, that is, the surface of the second tube sheet 300 facing the first region 110 is an asymmetric structure, as long as the exhaust hole 310 is located at the highest point of the second slope 320.
[0050] Alternatively, if Figure 1 As shown, the slope angle of the first slope 220 is a, a>2°. For example, a can be 2°, 3° or 5°, etc., so that dirt and impurities can move more smoothly on the first slope 220 and enter the sewage pipe 400 through the sewage hole 210, further reducing the probability of dirt and impurities accumulating on the first slope 220.
[0051] Alternatively, if Figure 1 As shown, the slope angle of the second slope 320 is b, b>2°. For example, b can be 2°, 3° or 5°, so that water vapor can move more smoothly on the second slope 320 and enter the exhaust pipe 500 through the exhaust hole 310, further reducing the probability of water vapor gathering on the second slope 320.
[0052] Optionally, the quench heat exchanger further includes a valve (not shown in the figure), which is disposed on the drain pipe 400. The valve is selectively opened or closed, and the dirt and impurities on the first slope 220 enter the drain pipe 400 through the drain hole 210 and are intermittently discharged from the drain pipe 400 to prevent excessive saturated water in the first area 110 from entering the drain pipe 400 and being discharged from the drain pipe 400.
[0053] It should be pointed out that since the generation of dirt and impurities is not continuous and the amount of dirt and impurities generated is small, the intermittent discharge of dirt and impurities from the sewage pipe 400 will not cause the problem of dirt and impurities accumulating in the sewage pipe 400.
[0054] It should also be pointed out that the method of selectively opening or closing the valve can be implemented in a variety of common ways in the art, for example, manually opening or closing the valve at intervals; or manually judging whether to open or close the valve based on experience; or, connecting the controller to the valve signal and pre-entering a preset time value in the controller, and when the preset time is reached, the controller controls the valve to open or close; or, connecting the controller to the valve signal and pre-entering a preset pressure value in the controller, and when the pressure on the valve plate of the valve reaches the preset pressure, the controller controls the valve to open or close. The remaining methods for selectively opening or closing the valve are not listed here one by one.
[0055] Optionally, the exhaust pipe 500 is not provided with valves and other components, so that the water vapor in the exhaust pipe 500 can be continuously discharged from the exhaust pipe 500. In the first area 110, saturated water continuously absorbs the heat of the cracked gas in the heat exchange tube 600, so that water vapor is continuously generated in the first area 110. Here, the water vapor in the exhaust pipe 500 is continuously discharged from the exhaust pipe 500, which can avoid the accumulation of water vapor in the exhaust pipe 500, and is conducive to the water vapor in the first area 110 quickly passing through the exhaust hole 310 to enter the exhaust pipe 500, further reducing the probability of water vapor accumulating on the second slope 320. In addition, the structural design eliminates the need to install valve components on the exhaust pipe 500, which has the effect of reducing parts and simplifying the structure.
[0056] Optionally, the diameters of the heat exchange tube 600, the sewage pipe 400 and the exhaust pipe 500 are equal to facilitate production and processing, which helps to reduce production difficulty and reduce production costs.
[0057] Optionally, since part of the sewage pipe 400 is located in the second area 120 and part of the exhaust pipe 500 is located in the third area 130, and high-temperature cracking gas flows in both the second area 120 and the third area 130, the sewage pipe 400 and the exhaust pipe 500 are both made of high-temperature resistant materials, such as fully austenitic low-carbon nickel-iron-chromium alloy (Incoloy 800HT) or forgings and other common high-temperature resistant materials in the field, which are not listed here one by one.
[0058] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of protection of the present invention. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.
Claims
1. A quench heat exchanger, in which cracked gas and saturated water can exchange heat, characterized in that: The quench heat exchanger comprises: A housing (100), the housing (100) comprising a first region (110); A first tube sheet (200) and a second tube sheet (300), wherein the first tube sheet (200) and the second tube sheet (300) are arranged in the shell (100) at intervals from bottom to top, and the first tube sheet (200), the second tube sheet (300) and the inner wall of the shell (100) enclose the first area (110), and the saturated water can flow in the first area (110); A sewage pipe (400), wherein the first tube sheet (200) is provided with a sewage hole (210), the surface of the first tube sheet (200) facing the first area (110) is a first slope surface (220), and the sewage hole (210) is located at the lowest point of the first slope surface (220), and the sewage pipe (400) is connected to the sewage hole (210); An exhaust pipe (500), wherein the second tube sheet (300) is provided with an exhaust hole (310), the surface of the second tube sheet (300) facing the first region (110) is a second slope surface (320), and the exhaust hole (310) is located at the highest point of the second slope surface (320), and the exhaust pipe (500) is in communication with the exhaust hole (310).
2. The quench heat exchanger according to claim 1, characterized in that: The slope angle of the first slope surface (220) is a, where a>2°; And / or, the slope angle of the second slope surface (320) is b, and b>2°.
3. The quench heat exchanger according to claim 1, characterized in that: The sewage discharge hole (210) is located at the center of the first tube sheet (200); And / or, the exhaust hole (310) is located at the center of the second tube sheet (300).
4. The quench heat exchanger according to claim 1, characterized in that: The quench heat exchanger further comprises a valve, which is arranged on the sewage pipe (400) and is selectively opened or closed.
5. The quench heat exchanger according to any one of claims 1 to 4, characterized in that: The quench heat exchanger further comprises a heat exchange tube (600), wherein the heat exchange tube (600) is arranged in the first region (110); the shell (100) further comprises a second region (120) and a third region (130); the second region (120) is located on a side of the first tube sheet (200) away from the first region (110); the third region (130) is located on a side of the second tube sheet (300) away from the first region (110); the second region (120) and the third region (130) are both connected to the heat exchange tube (600); and the cracked gas can flow in the second region (120), the heat exchange tube (600) and the third region (130).
6. The rapid cooling heat exchanger according to claim 5, characterized in that: The sewage pipe (400) is disposed through the side wall of the shell (100), and one end of the sewage pipe (400) is located in the second area (120) and communicates with the sewage hole (210); The exhaust pipe (500) is disposed through a side wall of the shell (100), and one end of the exhaust pipe (500) is located in the third area (130) and communicates with the exhaust hole (310).
7. The rapid cooling heat exchanger according to claim 6, characterized in that: In a direction away from the axis of the sewage discharge hole (210), the sewage discharge pipe (400) gradually slopes downward; In a direction away from the axis of the exhaust hole (310), the exhaust pipe (500) gradually tilts upward.
8. The rapid cooling heat exchanger according to claim 7, characterized in that: The angle between the axis of the sewage pipe (400) and the horizontal plane is c, c>2°; And / or, the angle between the axis of the exhaust pipe (500) and the horizontal plane is d, and d>2°.
9. The rapid cooling heat exchanger according to claim 5, characterized in that: The surface of the first tube sheet (200) facing the second region (120) is a plane.
10. The quench heat exchanger according to claim 5, characterized in that: The surface of the second tube sheet (300) facing the third region (130) is a plane.