Horizontal water-cooled membrane wall waste heat boiler

Abstract

The utility model relates to the technical field of waste heat boiler discloses a horizontal water -cooling membrane type wall waste heat boiler, including membrane type water cooling wall, the top fixedly connected with upper collecting box of membrane type water cooling wall, both sides middle end of membrane type water cooling wall all are fixedly connected with lower collecting box, the top side of membrane type water cooling wall is provided with steam pocket, both sides of the bottom of steam pocket all are fixedly connected with lower collecting box through downcomer, the rear side of steam pocket is fixedly connected with the top side of upper collecting box through riser, the outer wall of membrane type water cooling wall is connected with the protective housing through the dismouting component. In the utility model, detachable heat preservation layer and protective housing are used, need not use cutting tool, can only through simple operation to detach the protective housing and carry out the check and the maintenance to the heating surface, replace the flue bottom side from the traditional firebrick with the inclined ash bucket formed by membrane type water cooling wall, additionally increase the heating area.

Description

Technical Field

[0001] This utility model relates to the field of waste heat boiler technology, and in particular to a horizontal water-cooled membrane wall waste heat boiler. Background Technology

[0002] Waste heat boilers are boilers that use the residual heat from waste gas, waste materials, or waste liquids in various industrial processes, as well as the heat generated after the combustion of combustible substances, to heat water to a certain temperature. Because waste heat boilers greatly improve the utilization rate of the heat released by fuel combustion, these boilers are very energy-efficient. Membrane water-cooled walls are water-cooled walls composed of airtight tube screens welded together from flat steel and pipes. They can ensure that the furnace has good airtightness, and for negative pressure boilers, they can significantly reduce the air leakage coefficient of the furnace and improve the combustion conditions inside the furnace. They can increase the effective radiant heating area, thereby saving steel consumption.

[0003] In existing boilers of this type, the traditional protective shell is mostly welded or integrally fixed, making it an inseparable unit with the membrane wall. When inspection, cleaning, or maintenance of the membrane wall's heating surface is required, maintenance personnel often have to cut and damage the protective shell to perform the operation, and then re-weld it after the maintenance is completed. This process not only greatly extends downtime for maintenance, seriously affecting production continuity, but also significantly increases maintenance costs such as labor and materials, and may damage the main structure due to repeated welding.

[0004] In response to this technical problem, this application proposes a horizontal water-cooled membrane wall waste heat boiler. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a horizontal water-cooled membrane wall waste heat boiler. It uses a removable insulation layer and protective shell, and the protective shell can be disassembled and the heating surface can be inspected and repaired without the need for cutting tools. The bottom side of the flue is replaced with an inclined ash hopper composed of a membrane water-cooled wall instead of traditional refractory bricks, which increases the heating area.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A horizontal water-cooled membrane wall waste heat boiler includes a membrane water-cooled wall. An upper header is fixedly connected to the top of the membrane water-cooled wall, and lower headers are fixedly connected to the middle of both sides of the membrane water-cooled wall. A steam drum is provided on the top side of the membrane water-cooled wall. The bottom sides of the steam drum are fixedly connected to the lower headers through downcomers. The rear side of the steam drum is fixedly connected to the top side of the upper header through a riser. A protective shell is connected to the outer wall of the membrane water-cooled wall through a disassembly assembly.

[0007] Furthermore, the assembly / disassembly assembly includes a mounting base fixedly connected to the outer wall of the membrane water-cooled wall. A plate and a pin are inserted into the middle of the mounting base. A mounting block is fixedly connected to the top side of the plate and the pin. A rotating handle is rotatably connected to the middle of the mounting block via a rotating shaft. A gear is sleeved on the outer wall of the rotating shaft.

[0008] Furthermore, racks are meshed on both the front and rear sides of the gear, and locking plates are fixedly connected to the sides of the two racks away from the mounting block.

[0009] Furthermore, a protrusion is fixedly connected to the bottom end of the locking plate near the mounting base, and insertion holes are provided on both sides of the bottom end of the mounting base, with the protrusion inserted into the insertion holes.

[0010] Furthermore, a smoke inlet connecting plate is fixedly connected to the front side of the membrane water-cooled wall, and a smoke outlet connecting plate is fixedly connected to the rear side of the membrane water-cooled wall. An upstream device is fixedly connected to the front side of the smoke inlet connecting plate via a flange and a pipe, and a non-metallic expansion joint is installed on the outer wall of the pipe.

[0011] Furthermore, an ash hopper is fixedly connected to the bottom end of the membrane water-cooled wall, and an ash discharge valve is installed at the bottom end of the ash hopper.

[0012] Furthermore, an insulation layer is fixedly connected to the side of the protective shell near the membrane water-cooled wall, and a through hole is provided at the middle of the protective shell and the insulation layer, and the number of through holes is multiple.

[0013] Furthermore, the insulation layer adopts a composite structure of nanoporous heat insulation board and ceramic fiber composite material in the high temperature region.

[0014] This utility model has the following beneficial effects: 1. In this utility model, the protective shell is transformed into a detachable component by using an mounting base and mounting block, which realizes non-destructive and convenient maintenance of the boiler membrane wall. Maintenance personnel do not need to cut the protective shell, but only need to operate the mounting block to remove the protective shell to inspect the heated surface, which shortens the downtime for maintenance and reduces maintenance costs.

[0015] 2. In this utility model, the bottom of the flue, which is made of traditional refractory bricks, is replaced with an inclined ash hopper made of membrane water-cooled walls. The inclined smooth wall surface allows the accumulated ash to automatically slide down to the ash discharge port under the action of gravity, avoiding the risk of ash accumulation hindering heat exchange, corroding the furnace body, or even blocking the flue. This ensures the continuous, stable, and efficient operation of the boiler. In addition, the extra water-cooled wall surface increases the heat receiving area, making fuller use of the heat of the flue gas and improving the heat recovery efficiency of the boiler. At the same time, the water-cooled wall keeps the ash hopper wall surface at a low temperature, effectively preventing the high-temperature melting and coking of the flue ash. Attached Figure Description

[0016] Figure 1 This is a perspective view of a horizontal water-cooled membrane wall waste heat boiler proposed in this utility model. Figure 2 This is a schematic diagram of the structure of the protective shell of a horizontal water-cooled membrane wall waste heat boiler after disassembly. Figure 3 This is a schematic diagram of the internal structure of the flue of a horizontal water-cooled membrane waste heat boiler proposed in this utility model. Figure 4 This is a schematic diagram of the protective shell and insulation layer structure of a horizontal water-cooled membrane wall waste heat boiler proposed in this utility model. Figure 5 This is a schematic diagram of the disassembly and assembly components of a horizontal water-cooled membrane waste heat boiler proposed in this utility model. Figure 6 This is a schematic diagram of the internal structure of the disassembly and assembly components of a horizontal water-cooled membrane waste heat boiler proposed in this utility model.

[0017] Legend: 1. Membrane water-cooled wall; 2. Protective shell; 3. Steam drum; 4. Riser pipe; 5. Downcomer pipe; 6. Upstream equipment; 7. Non-metallic expansion joint; 8. Mounting base; 9. Ash hopper; 10. Ash discharge valve; 11. Smoke outlet connecting plate; 12. Lower header; 13. Upper header; 14. Smoke inlet connecting plate; 15. Insulation layer; 16. Mounting block; 17. Insert plate; 18. Locking plate; 19. Pin; 20. Gear; 21. Rack; 22. Protrusion. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Reference Figures 1-3This utility model provides an embodiment of a horizontal water-cooled membrane wall waste heat boiler, including a membrane water-cooled wall 1, which serves as the main heat exchange surface. The membrane wall structure effectively increases the heat exchange area and improves the pressure-bearing capacity. An upper header 13 is fixedly connected to the top of the membrane water-cooled wall 1 to collect the steam-water mixture generated by evaporation. Lower headers 12 are fixedly connected to the middle of both sides of the membrane water-cooled wall 1 to distribute the circulating water flow and support the lower structure of the membrane wall. A steam drum 3 is installed on the top side of the membrane water-cooled wall 1, serving as a key component for steam-water separation and water storage, ensuring stable water circulation in the system. The bottom sides of the steam drum 3 are fixedly connected to the lower headers 12 via downcomers 5, and the rear side of the steam drum 3 is connected to the upper header 13 via risers 4. The membrane water-cooled wall 1 is fixedly connected to the top side. The outer wall of the membrane water-cooled wall 1 is connected to a protective shell 2 through a disassembly and assembly assembly, which facilitates external insulation and safety protection, and also facilitates inspection and maintenance. The bottom end of the membrane water-cooled wall 1 is fixedly connected to an ash hopper 9, which is used to collect ash in the flue gas and discharge it centrally. The bottom end of the ash hopper 9 is equipped with an ash discharge valve 10 to control the ash discharge process and maintain the system's airtightness. The front side of the membrane water-cooled wall 1 is fixedly connected to an inlet connection plate 14, and the rear side of the membrane water-cooled wall 1 is fixedly connected to an outlet connection plate 11, which is used for the entry and exit of flue gas. The front side of the inlet connection plate 14 is fixedly connected to an upstream device 6 through a flange and a pipe. The outer wall of the pipe is equipped with a non-metallic expansion joint 7 to compensate for the displacement and vibration of the pipe caused by temperature changes.

[0020] Reference Figure 4 The protective shell 2 is fixedly connected to the insulation layer 15 on the side near the membrane water-cooled wall 1, which effectively reduces heat loss and improves boiler thermal efficiency. The protective shell 2 and the insulation layer 15 are provided with through holes in the middle, and there are multiple through holes for inserting the mounting base 8. The insulation layer 15 adopts a composite structure of nanoporous heat insulation board and ceramic fiber composite material in the high temperature area, which significantly improves heat insulation performance and extends service life.

[0021] Reference Figure 5 and Figure 6 The assembly and disassembly components include a mounting base 8 fixedly connected to the outer wall of the membrane water-cooled wall 1, serving as the basic support structure for the outer shell installation. A plate 17 and a pin 19 are inserted into the middle of the mounting base 8 to achieve quick positioning and initial fixation. A mounting block 16 is fixedly connected to the top side of the plate 17 and the pin 19. A rotating handle is rotatably connected to the middle of the mounting block 16 via a rotating shaft. A gear 20 is sleeved on the outer wall of the rotating shaft to convert the rotational motion into linear motion, achieving bidirectional locking. Racks 21 are meshed on both the front and rear sides of the gear 20, driving the locking plate 18 to move synchronously and ensuring symmetrical locking. Locking plates 18 are fixedly connected to the sides of the two racks 21 away from the mounting block 16 to ensure a stable connection. A protrusion 22 is fixedly connected to the bottom end of the locking plate 18 near the mounting base 8. Insertion holes are opened on both sides of the bottom end of the mounting base 8, and the protrusion 22 is inserted into the insertion holes of the mounting base 8 to achieve mechanical interlocking and prevent detachment.

[0022] Working principle: When the boiler is running, the flue gas outlet of the upstream equipment 6 is connected to the boiler's flue gas inlet connection plate 14 through pipes and flanges, and a non-metallic expansion joint 7 is installed to compensate for installation errors and displacement. At the same time, the flue gas outlet connection plate 11 is connected to the downstream environmental protection equipment through pipes and flanges, and a non-metallic expansion joint 7 is installed. When the flue gas passes through the flue formed by the membrane water-cooled wall 1, the ash carried in the flue gas settles due to gravity and falls onto the inclined wall surface at the bottom of the flue. The low-temperature smooth inclined wall surface guides the ash to concentrate and be discharged from the ash hopper 9, avoiding ash accumulation in the flue. When maintenance is required, the rotating handle on the top side of the mounting block 16 is turned, which drives the gear 20 on the bottom side of the rotating handle to rotate. The rack 21 meshing with the gear 20 moves to both sides of the mounting block 16. Slide the locking plate 18, which is fixedly connected to the rack 21, to open to both sides. The protrusion 22 at the bottom of the locking plate 18, which is inserted into the insertion holes on both sides of the mounting base 8, disengages from the insertion holes, releasing the locking of the mounting block 16. Pull the mounting block 16 upwards to remove the protective shell 2 from the membrane water-cooled wall 1. After maintenance, first align the hole in the middle of the protective shell 2 with the mounting base 8 on the outer wall of the membrane water-cooled wall 1 and insert it. Then, align the pin 19 and the insertion plate 17 fixedly connected to the bottom side of the mounting block 16 with the opening at the top of the mounting base 8 and insert them. Rotate the handle in the opposite direction to tighten the locking plate 18 inwards and lock the mounting block 16 again. The mounting block 16 can then fix the protective shell 2 to the outer wall of the membrane water-cooled wall 1.

[0023] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A horizontal water-cooled membrane wall waste heat boiler, comprising a membrane water-cooled wall (1), characterized in that: The top of the membrane water-cooled wall (1) is fixedly connected to an upper header (13), and the middle of both sides of the membrane water-cooled wall (1) are fixedly connected to lower headers (12). A steam drum (3) is provided on the top side of the membrane water-cooled wall (1). The bottom sides of the steam drum (3) are fixedly connected to the lower headers (12) through downcomers (5). The rear side of the steam drum (3) is fixedly connected to the top side of the upper header (13) through an upcomer (4). The outer wall of the membrane water-cooled wall (1) is connected to a protective shell (2) through a disassembly assembly.

2. A horizontal water-cooled membrane waste heat boiler according to claim 1, characterized in that: The assembly and disassembly assembly includes a mounting base (8) fixedly connected to the outer wall of the membrane water-cooled wall (1). A plate (17) and a pin (19) are inserted into the middle of the mounting base (8). A mounting block (16) is fixedly connected to the top side of the plate (17) and the pin (19). A rotating handle is rotatably connected to the middle of the mounting block (16) via a rotating shaft. A gear (20) is sleeved on the outer wall of the rotating shaft.

3. A horizontal water-cooled membrane waste heat boiler according to claim 2, characterized in that: The gear (20) is meshed with racks (21) on both the front and rear sides, and locking plates (18) are fixedly connected to the side of each rack (21) away from the mounting block (16).

4. A horizontal water-cooled membrane waste heat boiler according to claim 3, characterized in that: The locking plate (18) has a protrusion (22) fixedly connected to the bottom end of the side near the mounting base (8). The mounting base (8) has insertion holes on both sides of the bottom end, and the protrusion (22) is inserted into the insertion hole.

5. A horizontal water-cooled membrane waste heat boiler according to claim 1, characterized in that: The front side of the membrane water-cooled wall (1) is fixedly connected to a smoke inlet connecting plate (14), the rear side of the membrane water-cooled wall (1) is fixedly connected to a smoke outlet connecting plate (11), the front side of the smoke inlet connecting plate (14) is fixedly connected to an upstream device (6) through a flange and a pipe, and a non-metallic expansion joint (7) is installed on the outer wall of the pipe.

6. A horizontal water-cooled membrane waste heat boiler according to claim 1, characterized in that: The bottom end of the membrane water-cooled wall (1) is fixedly connected to an ash hopper (9), and the bottom end of the ash hopper (9) is equipped with an ash discharge valve (10).

7. A horizontal water-cooled membrane waste heat boiler according to claim 1, characterized in that: The protective shell (2) is fixedly connected to the insulation layer (15) on the side near the membrane water-cooled wall (1). The protective shell (2) and the insulation layer (15) have through holes at their middle ends. There are multiple through holes.

8. A horizontal water-cooled membrane waste heat boiler according to claim 7, characterized in that: The insulation layer (15) adopts a composite structure of nanoporous heat insulation board and ceramic fiber composite material in the high temperature area.

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