Multi-channel membrane water cooling structure of zinc oxide waste heat boiler
By employing a multi-channel membrane water-cooled structure and an inverted N-shaped flue arrangement, the problems of low dust recovery efficiency and insufficient heat energy utilization in zinc oxide waste heat boilers are solved, achieving efficient dust separation and heat energy recovery. It features a compact structure and low cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHENGZHOU ZHONGDING ENERGY SAVING & ENVIRONMENTAL PROTECTION TECHNOLOGY CO LTD
- Filing Date
- 2025-06-19
- Publication Date
- 2026-05-29
AI Technical Summary
Existing zinc oxide waste heat boilers have low dust recovery efficiency, insufficient heat energy utilization, and traditional structures are large in size, costly, and have low thermal efficiency.
It adopts a multi-channel membrane water-cooling structure, including a furnace flue gas channel, a second flue gas channel and a tail flue gas channel, and is equipped with a multi-stage dust separation device. It also adopts an inverted N-shaped flue arrangement and a finned tube serpentine structure to achieve efficient heat transfer and dust separation.
It achieves efficient dust separation and heat recovery, with a compact structure, low cost, small footprint, and the advantages of efficient heat transfer and environmental protection and energy saving.
Smart Images
Figure CN224302053U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of boiler technology, and more specifically, to a multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler. Background Technology
[0002] Typically, waste heat from zinc oxide is discharged after dust is recovered through a rudimentary settling chamber. This not only results in low zinc oxide recovery efficiency and poor performance, but also leads to the inefficient utilization of heat in the dust-laden flue gas, causing resource waste. Traditional dust treatment devices are bulky, have long construction periods, and high investment costs. Traditional waste heat boilers often employ horizontal single-channel structures or vertical double-sided heavy-duty wall structures, which result in large footprints, significant heat loss, and low thermal efficiency.
[0003] Therefore, a multi-channel membrane water-cooled structure for zinc oxide waste heat boilers is proposed. Utility Model Content
[0004] In order to overcome the above-mentioned defects of the prior art, this utility model provides a multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler. The multi-channel membrane water-cooled structure consists of a three-stage flue gas separation device composed of water-cooled membrane walls, in order to solve the problems mentioned in the background art.
[0005] To achieve the above objectives, this utility model provides the following technical solution: a multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler, comprising a foundation, a steel frame, a boiler drum, a furnace flue gas channel, a second flue gas channel, a tail flue gas channel, a front membrane wall, and a rear membrane wall; the furnace flue gas channel is equipped with an evaporator I, a low-temperature superheater, and a high-temperature superheater; the tail flue gas channel is equipped with an evaporator II, a high-temperature economizer, a medium-temperature economizer, and a low-temperature economizer; the upper part of the front membrane wall is equipped with a flue gas inlet, and the lower part of the rear membrane wall is equipped with a flue gas outlet; a primary dust separation device is installed at the bottom of the furnace flue gas channel, a secondary dust separation device is installed at the bottom of the second flue gas channel, and a tertiary dust separation device is installed at the bottom of the tail flue gas channel.
[0006] Preferably, the multi-channel membrane water-cooled structure of the zinc oxide waste heat boiler is characterized in that: the furnace flue gas channel, the second flue gas channel and the tail flue gas channel are all composed of membrane wall flue partitions.
[0007] Preferably, the furnace flue gas passage is composed of a front wall membrane wall, a middle front wall membrane wall, and a side membrane wall; the second flue gas passage is composed of a middle front wall membrane wall, a middle rear wall membrane wall, and a side membrane wall; and the tail flue gas passage is composed of a middle rear wall membrane wall, a rear wall membrane wall, and a side membrane wall.
[0008] Preferably, the primary dust separation device consists of a front membrane wall, a side membrane wall, and an ash hopper; the secondary dust separation device consists of a middle and rear membrane wall, a side membrane wall, and an ash hopper; and the tertiary dust separation device consists of a rear membrane wall, a side membrane wall, and an ash hopper.
[0009] Preferably, a high-temperature economizer (18), a medium-temperature economizer, and a low-temperature economizer are suspended on the steel frame by a serpentine structure formed by bending boiler finned tubes, and the high-temperature economizer, the medium-temperature economizer, and the low-temperature economizer (20) are arranged in a horizontal row in the tail flue gas passage.
[0010] The beneficial effects of this utility model are:
[0011] By adopting a full membrane water-cooled structure and an inverted N-shaped flue arrangement, a primary, secondary, and tertiary flue dust separation device is constructed at the bottom of the inverted N-shaped flue. This gives the heating surface a multi-functionality that can both conduct convective heat transfer and isolate flue gas. Thus, this waste heat boiler not only has the functions of efficient heat transfer and three-stage in-furnace flue dust separation, but also has the advantages of compact structure, low cost, small footprint, high efficiency, environmental protection, and energy saving. Attached Figure Description
[0012] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0013] Figure 2 This is a schematic diagram of the left-side planar structure of this utility model.
[0014] The attached diagram is labeled as follows: 1. Foundation; 2. Steel frame; 3. Primary dust separation device; 4. Evaporator I; 5. Furnace flue gas passage; 6. Front membrane wall; 7. Low-temperature superheater; 8. High-temperature superheater; 9. Flue gas inlet; 10. Boiler drum; 11. Middle front membrane wall; 12. Secondary flue gas passage; 13. Secondary dust separation device; 14. Middle rear membrane wall; 15. Tail flue gas passage; 16. Rear membrane wall; 17. Evaporator II; 18. High-temperature economizer; 19. Medium-temperature economizer; 20. Low-temperature economizer; 21. Flue gas outlet; 22. Tertiary dust separation device; 23. Ash hopper; 24. Side membrane wall. Detailed Implementation
[0015] 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.
[0016] As attached Figure 1-2The diagram shows a multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler. The boiler body is placed on a concrete foundation 1, with the boiler drum 10 at the top of the boiler body. The flue gas inlet 9 is located on the upper part of the front wall membrane wall 6. Flue gas enters the boiler body from the flue gas inlet 9 and turns 90° downwards through the furnace flue gas channel 5, which is composed of the front wall membrane wall 6, the middle front wall membrane wall 11, and the side membrane wall 24. The evaporator I4, the low-temperature superheater 7, and the high-temperature superheater 8 are arranged inside the furnace flue gas channel 5. Below the furnace flue gas channel 5, there is a primary dust separation device 3, which is composed of the front wall membrane wall 6, the side membrane wall 24, and the ash hopper 23. Fly ash falls into the primary dust separation device 3 due to inertia. After passing through the primary dust separation device 3, the flue gas turns 180° and enters the second flue gas channel 12 from the bottom. Fly ash falls into the bottom of the secondary dust separation device 13 due to inertia.
[0017] The second flue gas passage 12 consists of a front wall membrane wall 11, a rear wall membrane wall 14, and a side membrane wall 24. The flue gas at the top horizontal outlet of the second flue gas passage 12 turns 90° downwards into the tail flue gas passage 15. The tail flue gas passage 15 consists of a rear wall membrane wall 14, a rear wall membrane wall 16, and a side membrane wall 24. Evaporator II 17, high-temperature economizer 18, medium-temperature economizer 19, and low-temperature economizer 20 are arranged within the tail flue gas passage 15. Below the tail flue gas passage 15 is a three-stage dust separation device 22 consisting of a rear wall membrane wall 16, a side membrane wall 24, and an ash hopper 23. After passing through the three-stage dust separation device 22, the flue gas turns 90° and exits the furnace through the flue gas outlet 21. Fly ash falls to the bottom of the three-stage dust separation device 22 due to inertia, and then the zinc oxide inside the dust separation device is periodically cleaned out of the furnace.
[0018] To increase the convective heating area, the evaporators I4 and II17 are suspended from the hanging device by tubes bent into a serpentine structure. To ensure that the superheater outlet steam reaches the rated outlet parameters, the superheater consists of inlet and outlet headers, a water spray desuperheater, two sets of low-temperature superheater 7 serpentine tubes, and one set of high-temperature superheater 8 serpentine tubes. The superheater serpentine tubes are horizontally suspended in the flue gas passage 5 of the furnace. To improve the scouring of the economizer by the flue gas, the economizer is suspended from the steel frame 2 by boiler finned tubes bent into a serpentine structure and arranged horizontally in the tail flue gas passage 15. The economizer is arranged in three sections: high-temperature economizer 18, medium-temperature economizer 19, and low-temperature economizer 20. The flue gas outlet temperature 21 can be controlled relatively precisely. The three economizers can be decoupled and operated independently, which is convenient for maintenance and replacement. The finned tube structure greatly improves the heating area and heat transfer efficiency. The structure is simple and relatively compact.
[0019] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. 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 multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler, characterized in that: It includes the foundation (1), steel frame (2), boiler drum (10), furnace flue gas passage (5), second flue gas passage (12), tail flue gas passage (15), front wall membrane wall (6) and rear wall membrane wall (16); The furnace flue gas passage (5) is equipped with an evaporator I (4), a low-temperature superheater (7) and a high-temperature superheater (8); The tail flue gas passage (15) is equipped with an evaporator II (17), a high-temperature economizer (18), a medium-temperature economizer (19) and a low-temperature economizer (20); A flue gas inlet (9) is provided at the upper part of the front wall membrane wall (6), and a flue gas outlet (21) is provided at the lower part of the rear wall membrane wall (16); A primary dust separation device (3) is installed at the bottom of the flue gas passage (5) in the furnace, a secondary dust separation device (13) is installed at the bottom of the second flue gas passage (12), and a tertiary dust separation device (22) is installed at the bottom of the tail flue gas passage (15).
2. The multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler according to claim 1, characterized in that: The furnace flue gas passage (5), the second flue gas passage (12) and the tail flue gas passage (15) are all composed of membrane wall flue partitions.
3. The multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler according to claim 2, characterized in that: The furnace flue gas passage (5) is composed of a front wall membrane wall (6), a middle front wall membrane wall (11), and a side membrane wall (24); The second flue gas passage (12) is composed of a front wall membrane wall (11), a rear wall membrane wall (14), and a side membrane wall (24); The tail flue gas passage (15) is composed of a middle and rear wall membrane wall (14), a rear wall membrane wall (16), and a side membrane wall (24).
4. The multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler according to claim 3, characterized in that: The primary dust separation device (3) consists of a front membrane wall (6), a side membrane wall (24), and an ash hopper (23); The secondary dust separation device (13) consists of a middle and rear wall membrane wall (14), a side membrane wall (24), and an ash hopper (23). The tertiary dust separation device (22) consists of a rear wall membrane wall (16), a side membrane wall (24), and an ash hopper (23).
5. The multi-channel membrane water-cooled structure for a zinc oxide waste heat boiler according to claim 4, characterized in that: The steel frame (2) is suspended by a serpentine structure formed by the boiler finned tubes. The high-temperature economizer (18), medium-temperature economizer (19) and low-temperature economizer (20) are arranged in a horizontal row in the tail flue gas passage (15).