A slag pool two-stage steam recovery type heat exchange device

Abstract

The application relates to a slag pool two-stage steam recovery type heat exchange device and relates to the technical field of heat exchange recovery, which comprises a heat exchange pipe, a primary heat exchange module is arranged on the heat exchange pipe, a steam inlet pipe is arranged at the bottom of the heat exchange pipe, the other end of the steam inlet pipe is communicated with a waste incineration slag pool, a secondary heat exchange module is arranged in the steam inlet pipe, high-temperature steam enters the heat exchange pipe from the waste incineration slag pool through the steam inlet pipe, the steam is subjected to primary heat exchange in the secondary heat exchange module in the steam inlet pipe, then enters the heat exchange pipe, and is subjected to deep heat exchange by the primary heat exchange module; heat is absorbed by a circulating medium; the secondary heat exchange module is subjected to primary heat exchange, and the primary heat exchange module is subjected to deep heat exchange; two-stage high-efficiency recovery greatly improves waste heat utilization rate; the secondary heat exchange module is arranged in front of the filter impurities, the structure of the primary heat exchange module is protected, and the problem of easy corrosion of the equipment is reduced.

Description

Technical Field

[0001] This application relates to the field of heat exchange and recovery technology, and in particular to a two-stage steam recovery heat exchanger for slag pools. Background Technology

[0002] The steam generated in the ash pits during waste incineration typically contains a large amount of heat energy, but most waste incineration plants currently do not effectively recover and utilize this heat energy, leading to energy waste. Furthermore, direct emission of ash pit steam causes environmental thermal pollution and odor spread. In recent years, with increasing environmental protection requirements and rising energy costs, ash pit steam recovery technology has gradually gained attention; however, existing technologies still suffer from low recovery efficiency and equipment corrosion.

[0003] Therefore, in view of the above situation, there is an urgent need to develop a two-stage steam recovery heat exchanger for slag pools to overcome the shortcomings in current practical applications. Utility Model Content

[0004] To address the shortcomings of the aforementioned technologies, this application provides a two-stage steam recovery heat exchanger for slag pools.

[0005] This application provides a two-stage steam recovery heat exchanger for a slag pool, which adopts the following technical solution: A two-stage steam recovery heat exchanger for a waste incineration slag pit includes a heat exchange tube, a primary heat exchange module on the heat exchange tube, a steam inlet pipe at the bottom of the heat exchange tube, the other end of the steam inlet pipe being connected to the waste incineration slag pit, and a secondary heat exchange module inside the steam inlet pipe.

[0006] Beneficial effects: The secondary module performs initial heat exchange, while the primary module performs deep heat exchange. The dual-stage high-efficiency recovery significantly improves the utilization rate of waste heat. The secondary module filters impurities in advance, protecting the primary heat exchange structure.

[0007] In one optional embodiment, one end of the heat exchange tube is an air inlet with a screen at the air inlet, and the other end of the heat exchange tube is an exhaust port with an exhaust assembly at the exhaust port.

[0008] Beneficial effects: The screen of the heat exchange tube filters out large particles of impurities from the outside air, preventing blockage of the heat exchange tube and protecting the internal primary heat exchange module structure. The exhaust component regulates the steam flow and optimizes heat exchange conditions.

[0009] In one optional embodiment, the primary heat exchange module includes multiple heat exchange coils, which are fixedly disposed on the inner wall of the heat exchange tube. A first liquid passage chamber is formed within the heat exchange coil. Multiple heat exchange columns are vertically fixedly disposed on the inner ring of the heat exchange coil. A second liquid passage chamber is disposed within each heat exchange column. The two ends of the first liquid passage chamber and the second liquid passage chamber are connected. A third liquid passage chamber is formed within a portion of the heat exchange tube corresponding to the multiple sets of heat exchange coils. A first liquid inlet pipe and a first liquid outlet pipe are disposed on the outer wall of the heat exchange tube corresponding to the two ends of the third liquid passage chamber.

[0010] Beneficial effects: The contact between the steam in the heat exchanger coil and the inner wall of the heat exchanger tube, the outer wall of the heat exchanger coil, and the outer wall of the heat exchanger column transfers heat to the coolant. The cooled steam liquefies and falls downwards. The heat exchanger column array significantly increases the contact area and improves the heat transfer efficiency. The heat exchanger column disrupts the steam flow direction, breaks the boundary layer, and enhances heat exchange. Multiple heat exchanger coils are connected in parallel, which facilitates maintenance or segmented replacement.

[0011] In one optional embodiment, a steam inlet is provided at the bottom of the heat exchange tube, and the steam inlet is connected to the steam inlet pipe.

[0012] Beneficial effects: After being pre-treated by the two-stage heat exchange module, the steam enters the heat exchange tubes evenly from the bottom steam inlet. Bottom steam inlet avoids airflow short-circuiting and ensures that the entire heat exchange tube section is filled.

[0013] In one optional embodiment, a liquid guide port is provided at the bottom of the other side of the heat exchange tube, and a liquid collection tank is provided below the liquid guide port.

[0014] Beneficial effects: Timely drainage of condensate prevents stagnation and corrosion of pipes; easily collected condensate can be treated and reused (e.g., boiler feedwater); accelerates liquid flow; and eliminates dead zones.

[0015] In one optional embodiment, the bottom of the heat exchange tube at the liquid inlet is sloped.

[0016] Beneficial effect: Steam condensate flows along the slope to the liquid outlet and into the collection tank for recycling.

[0017] In one optional embodiment, the secondary heat exchange module includes a first slot and a second slot. The first slot and the second slot are provided in the side wall of the steam inlet pipe. A first rotating frame and a second rotating frame are respectively rotatably arranged in the first slot and the second slot. A first filter screen is provided in the first rotating frame and a second filter screen is provided in the second rotating frame.

[0018] Beneficial effects: The first filter screen coarsely filters out large particles, while the second filter screen finely filters out fine dust, intercepting impurities of different particle sizes in stages, protecting the secondary heat exchange module. The first and second rotating frames can be rotated out for cleaning, enabling online cleaning without stopping the machine.

[0019] In one optional embodiment, a fourth liquid passage chamber is provided inside the first rotating frame, and an inlet and an outlet are provided on the first rotating frame. A second inlet pipe and a second outlet pipe are provided on the outer wall of the steam inlet pipe. The second inlet pipe communicates with the fourth liquid passage chamber through the liquid outlet, and the second outlet pipe communicates with the fourth liquid passage chamber through the liquid outlet.

[0020] Beneficial effects: Heat exchange begins during the filtration stage, improving overall recovery efficiency; the coolant provides cooling protection for the first filter, extending its service life.

[0021] In one optional embodiment, handles are provided on the outer sides of the first rotating frame and the second rotating frame, respectively.

[0022] Beneficial effects: The rotating frame can be pulled out by rotating the handle for cleaning or replacement. Maintenance can be performed without tools, and the quick operation reduces downtime.

[0023] In one optional embodiment, a fixing plate is provided on the inner wall of the steam inlet pipe, a rotating shaft is rotatably mounted on the fixing plate, a fan blade is mounted on the rotating shaft, and a rotating brush is mounted at the other end of the rotating shaft. The rotating brush is attached to the side of the second rotating frame facing the heat exchange tube.

[0024] Beneficial effects: Steam drives the fan blades to rotate, which in turn drives the rotating shaft to rotate within the fixed plate. This drives the rotating brush to clean the back of the second filter screen at high speed, removing the deposits on the second filter screen in real time, preventing the mesh from becoming clogged. The steam kinetic energy is used to automatically clean the dust, maintaining the filtration efficiency. No additional power is required, making it energy-saving and reliable.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. Two-stage heat exchange improves waste heat recovery rate; 2. Rotating filter screen supports online maintenance, reducing downtime; 3. The condensate is guided by a slope to prevent liquid accumulation and corrosion, thus extending the life of the equipment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the front view structure provided in an embodiment of this application; Figure 2 This is a schematic diagram of the rear view structure provided in an embodiment of this application; Figure 3 This is a schematic diagram of the front cross-sectional structure provided in an embodiment of this application; Figure 4 This is a schematic diagram of the cross-sectional structure of the first rotating frame provided in the embodiment of this application.

[0027] Explanation of reference numerals in the attached drawings: 1. Heat exchange tube; 11. Air inlet; 12. Screen; 13. Exhaust port; 14. Exhaust assembly; 15. Third liquid passage chamber; 16. Steam inlet; 17. Liquid guide port; 18. First liquid inlet pipe; 19. First liquid outlet pipe; 2. Primary heat exchange module; 21. Heat exchange coil; 22. First liquid passage chamber; 23. Heat exchange column; 24. Second liquid passage chamber; 3. Steam inlet pipe; 31. Second liquid inlet pipe; 32. Second liquid outlet pipe; 4. Secondary heat exchange module; 41. First slot; 42. Second slot; 43. First rotating frame; 44. Second rotating frame; 45. First filter screen; 46. Second filter screen; 47. Fourth liquid passage chamber; 48. Liquid inlet; 49. Liquid outlet; 50. Handle; 51. Fixing plate; 52. Rotating shaft; 53. Fan blade; 54. Rotating brush; 6. Liquid collection tank. Detailed Implementation

[0028] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0029] 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. They are used 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0030] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0031] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0032] The present invention provides the following embodiments. Example 1 This application discloses a two-stage steam recovery heat exchanger for a slag pool, referring to... Figure 1 , Figure 3 It includes a heat exchange tube 1, a primary heat exchange module 2 is provided on the heat exchange tube 1, a steam inlet pipe 3 is provided at the bottom of the heat exchange tube 1, the other end of the steam inlet pipe 3 is connected to the waste incineration slag pool, and a secondary heat exchange module 4 is provided inside the steam inlet pipe 3.

[0033] The working principle and beneficial effects of the above technical solution are as follows: High-temperature steam enters the heat exchange tube 1 from the waste incineration slag pool through the steam inlet pipe 3. The steam first undergoes initial heat exchange in the secondary heat exchange module 4 in the steam inlet pipe 3, and then enters the heat exchange tube 1, where it undergoes deep heat exchange in the primary heat exchange module 2. The heat is absorbed by the circulating medium. The secondary heat exchange module 4 performs initial heat exchange, and the primary heat exchange module 2 performs deep heat exchange. The dual-stage high-efficiency recovery greatly improves the waste heat utilization rate. The secondary heat exchange module 4 filters impurities beforehand, protecting the structure of the primary heat exchange module 2 and reducing the problem of easy corrosion of the equipment.

[0034] like Figures 1-2 As shown, one end of the heat exchange tube 1 is an air inlet 11, and a screen 12 is provided at the air inlet 11. The other end of the heat exchange tube 1 is an exhaust port 13, and an exhaust assembly 14 is provided on the exhaust port 13.

[0035] The working principle and beneficial effects of the above technical solution are as follows: one end of the heat exchange tube 1 is fixed to the screen 12, the exhaust assembly 14 draws out the ambient air and steam in the steam inlet pipe 3, forcibly guides the steam flow, enhances the heat exchange efficiency, and then discharges the remaining gas after the steam heat exchange liquefaction from the exhaust port 13 for the next processing operation. The screen 12 of the heat exchange tube 1 filters out large particulate impurities in the ambient air to prevent blockage of the heat exchange tube 1 and protect the internal primary heat exchange module 2 structure. The exhaust assembly 14 adjusts the steam flow and optimizes the heat exchange conditions.

[0036] like Figure 3 As shown, the primary heat exchange module 2 includes multiple heat exchange coils 21, which are fixedly disposed on the inner wall of the heat exchange tube 1. A first liquid passage chamber 22 is provided in the heat exchange coil 21. Multiple heat exchange columns 23 are vertically fixedly disposed on the inner ring of the heat exchange coil 21. A second liquid passage chamber 24 is provided in the heat exchange column 23. The two ends of the first liquid passage chamber 22 and the second liquid passage chamber 24 are connected. A third liquid passage chamber 15 is provided in the portion of the heat exchange tube 1 corresponding to the multiple sets of heat exchange coils 21. A first liquid inlet pipe 18 and a first liquid outlet pipe 19 are provided on the outer wall of the heat exchange tube 1 corresponding to the two ends of the third liquid passage chamber 15.

[0037] The working principle and beneficial effects of the above technical solution are as follows: The inner wall of the heat exchange tube 1 fixes multiple heat exchange coils 21, and the heat exchange coils 21 fix multiple heat exchange columns 23. The outer wall of the heat exchange tube 1 fixes the first liquid inlet pipe 18 and the first liquid outlet pipe 19 respectively. The coolant enters the third liquid passage chamber 15 from the first liquid inlet pipe 18, passes through the first liquid passage chamber 22, and then passes through the second liquid passage chamber 24 before being discharged into the collector through the first liquid outlet pipe 19 to complete the heat absorption cycle. The steam in the heat exchange coil 21 transfers heat to the coolant through contact with the inner wall of the heat exchange tube 1, the outer wall of the heat exchange coil 21, and the outer wall of the heat exchange column 23. The cooled steam liquefies and falls downward. The array of heat exchange columns 23 significantly increases the contact area and improves the heat transfer efficiency. The heat exchange columns 23 disrupt the steam flow direction, break the boundary layer, and enhance heat exchange. Multiple heat exchange coils 21 are connected in parallel, which facilitates maintenance or segmented replacement.

[0038] like Figure 3 As shown, a steam inlet 16 is provided at the bottom of the heat exchange tube 1, and the steam inlet 16 is connected to the steam inlet tube 3.

[0039] The working principle and beneficial effects of the above technical solution are as follows: After the steam is pretreated by the secondary heat exchange module 4, it enters the heat exchange tube 1 evenly from the bottom steam inlet 16. Bottom steam inlet avoids airflow short circuit and ensures that the entire heat exchange tube 1 is filled.

[0040] like Figure 3 As shown, a liquid guide port 17 is provided at the bottom of the other side of the heat exchange tube 1, and a liquid collection tank 6 is provided below the liquid guide port 17. The bottom of the heat exchange tube 1 at the liquid inlet 17 is sloped.

[0041] The working principle and beneficial effects of the above technical solution are as follows: the steam condensate flows along the inclined surface to the liquid guide port 17, flows into the liquid collection tank 6 for recovery, and the condensate is discharged in time to avoid stagnation and corrosion of the pipeline. The condensate that is easy to collect can be treated and reused (such as boiler feedwater), accelerates the liquid flow, and eliminates dead corners of accumulation.

[0042] like Figures 3-4 As shown, the secondary heat exchange module 4 includes a first slot 41 and a second slot 42. The first slot 41 and the second slot 42 are provided in the side wall of the steam inlet pipe 3. A first rotating frame 43 and a second rotating frame 44 are respectively rotatably arranged in the first slot 41 and the second slot 42. A first filter screen 45 is provided in the first rotating frame 43 and a second filter screen 46 is provided in the second rotating frame 44.

[0043] The working principle and beneficial effects of the above technical solution are as follows: the first slot 41 and the second slot 42 opened on the steam inlet pipe 3 respectively limit the first rotating frame 43 and the second rotating frame 44. The steam flows through the two-stage filter screen in sequence. The first filter screen 45 coarsely filters out large particles, and the second filter screen 46 finely filters out fine dust. Different particle sizes of impurities are intercepted in stages to protect the secondary heat exchange module 4. The first rotating frame 43 and the second rotating frame 44 can be rotated out for cleaning, realizing online cleaning without stopping the machine.

[0044] like Figures 3-4 As shown, a fourth liquid passage chamber 47 is provided inside the first rotating frame 43. The first rotating frame 43 is provided with a liquid inlet 48 and a liquid outlet 49. A second liquid inlet pipe 31 and a second liquid outlet pipe 32 are provided on the outer wall of the steam inlet pipe 3. The second liquid inlet pipe 31 is connected to the fourth liquid passage chamber 47 through a liquid outlet, and the second liquid outlet pipe 32 is connected to the fourth liquid passage chamber 47 through a liquid outlet 49.

[0045] The working principle and beneficial effects of the above technical solution are as follows: the coolant enters the fourth liquid passage chamber 47 from the second liquid inlet pipe 31. The coolant in the fourth liquid passage chamber 47 absorbs the heat of the steam in the filter area and is then discharged from the second liquid outlet pipe 32. Heat exchange begins in the filtration stage, improving the overall recovery efficiency. The coolant cools and protects the first filter screen 45, extending its service life.

[0046] like Figure 4 As shown, handles 50 are respectively provided on the outer sides of the first rotating frame 43 and the second rotating frame 44.

[0047] The working principle and beneficial effects of the above technical solution are as follows: the rotating frame can be pulled out by rotating the handle 50° for cleaning or replacement. Maintenance can be carried out without tools, and the quick operation reduces downtime.

[0048] like Figure 3 As shown, a fixing plate 51 is provided on the inner wall of the steam inlet pipe 3, a rotating shaft 52 is rotatably mounted on the fixing plate 51, a fan blade 53 is provided on the rotating shaft 52, and a rotating brush 54 is provided at the other end of the rotating shaft 52. The rotating brush 54 is attached to the side of the second rotating frame 44 facing the heat exchange pipe 1.

[0049] The working principle and beneficial effects of the above technical solution are as follows: the inner wall of the steam inlet pipe 3 is fixed to the fixed plate 51, and the fixed plate 51 protects the rotating shaft 52 from rotation. Steam drives the fan blade 53 to rotate, which in turn drives the rotating shaft 52 to rotate within the fixed plate 51. This drives the rotating brush 54 to clean the back of the second filter screen 46 at high speed, removing the adhering substances on the second filter screen 46 in real time to prevent the mesh from clogging. The steam kinetic energy is used to automatically clean the dust and maintain the filtration efficiency. No additional power is required, making it energy-saving and reliable.

[0050] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this application.

Claims

1. A two-stage steam recovery heat exchanger for slag ponds, characterized in that: It includes a heat exchange tube (1), a primary heat exchange module (2) is provided on the heat exchange tube (1), a steam inlet pipe (3) is provided at the bottom of the heat exchange tube (1), the other end of the steam inlet pipe (3) is connected to the waste incineration slag pool, and a secondary heat exchange module (4) is provided inside the steam inlet pipe (3).

2. The slag pool two-stage steam recovery heat exchanger according to claim 1, characterized in that: One end of the heat exchange tube (1) is an air inlet (11), and a screen (12) is provided at the air inlet (11). The other end of the heat exchange tube (1) is an exhaust port (13), and an exhaust assembly (14) is provided on the exhaust port (13).

3. The slag pool two-stage steam recovery heat exchanger according to claim 2, characterized in that: The primary heat exchange module (2) includes multiple heat exchange coils (21). The heat exchange coils (21) are fixedly installed on the inner wall of the heat exchange tube (1). A first liquid passage chamber (22) is opened in the heat exchange coil (21). Multiple heat exchange columns (23) are vertically fixed on the inner ring of the heat exchange coil (21). A second liquid passage chamber (24) is provided in the heat exchange column (23). The two ends of the first liquid passage chamber (22) and the second liquid passage chamber (24) are connected. A third liquid passage chamber (15) is opened in the part of the heat exchange tube (1) corresponding to multiple sets of heat exchange coils (21). A first liquid inlet pipe (18) and a first liquid outlet pipe (19) are provided on the outer wall of the heat exchange tube (1) corresponding to the two ends of the third liquid passage chamber (15).

4. The two-stage steam recovery heat exchanger for slag pools according to claim 3, characterized in that: The bottom of the heat exchange tube (1) is provided with a steam inlet (16), which is connected to the steam inlet tube (3).

5. A two-stage steam recovery heat exchanger for slag pools according to claim 4, characterized in that: A liquid guide port (17) is provided at the bottom of the other side of the heat exchange tube (1), and a liquid collection tank (6) is provided below the liquid guide port (17).

6. A two-stage steam recovery heat exchanger for slag pools according to claim 5, characterized in that: The bottom of the heat exchange tube (1) at the liquid inlet (17) is sloped.

7. A two-stage steam recovery heat exchanger for slag pools according to claim 4, characterized in that: The secondary heat exchange module (4) includes a first slot (41) and a second slot (42). The first slot (41) and the second slot (42) are provided in the side wall of the steam inlet pipe (3). A first rotating frame (43) and a second rotating frame (44) are respectively rotatably arranged in the first slot (41) and the second slot (42). A first filter screen (45) is provided in the first rotating frame (43), and a second filter screen (46) is provided in the second rotating frame (44).

8. A two-stage steam recovery heat exchanger for slag pools according to claim 7, characterized in that: The first rotating frame (43) has a fourth liquid passage chamber (47) inside. The first rotating frame (43) is provided with a liquid inlet (48) and a liquid outlet (49). The outer wall of the steam inlet pipe (3) is provided with a second liquid inlet pipe (31) and a second liquid outlet pipe (32). The second liquid inlet pipe (31) is connected to the fourth liquid passage chamber (47) through the liquid outlet, and the second liquid outlet pipe (32) is connected to the fourth liquid passage chamber (47) through the liquid outlet (49).

9. A two-stage steam recovery heat exchanger for slag pools according to claim 8, characterized in that: Handles (50) are provided on the outer sides of the first rotating frame (43) and the second rotating frame (44).

10. A two-stage steam recovery heat exchanger for slag pools according to claim 9, characterized in that: A fixing plate (51) is provided on the inner wall of the steam inlet pipe (3). A rotating shaft (52) is rotatably provided on the fixing plate (51). A fan blade (53) is provided on the rotating shaft (52). A rotating brush (54) is provided at the other end of the rotating shaft (52). The rotating brush (54) is attached to the side of the second rotating frame (44) facing the heat exchange pipe (1).

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