Water-cooling arch chain type steam boiler

Abstract

The utility model relates to the technical field of boilers, in particular to a water-cooling arch chain type steam boiler which comprises a boiler body, a boiler barrel arranged on the upper portion of the boiler body, a hearth arranged on the lower portion of the boiler body, a chain grate stoker installed at the bottom of the boiler body, a front water-cooling arch installed on the front portion of the hearth, and a rear water-cooling arch installed on the rear portion of the hearth. Downcomers are connected to the bottoms of the two sides of the boiler barrel, the bottom ends of the downcomers are connected with headers, a front smoke box is arranged outside one end of the boiler barrel, a rear smoke box is arranged outside the other end of the boiler barrel, and the top of the hearth is communicated with the front smoke box. According to the water-cooling arch chain type steam boiler, the unique water-cooling arch design is combined with the chain grate stoker, so that the heat efficiency and the operation stability of the boiler are remarkably improved. Specifically, the front water-cooling arch and the rear water-cooling arch form a splayed shielding structure above the hearth, so that the heating area of the boiler is effectively increased, the heat exchange process in the hearth is optimized, combustion is more sufficient, and heat loss is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of boilers, in particular to a water-cooled arch chain type steam boiler. Background Art

[0002] In the field of boiler technology, steam boilers, as important heat energy conversion equipment, are widely used in industrial production, heating systems and other fields.

[0003] Traditional steam boilers often face challenges during design and operation, such as low thermal efficiency, complex structure, and difficult maintenance. Chain grate steam boilers, in particular, have long been a research focus on how to effectively improve furnace combustion efficiency while ensuring safe and stable operation. Utility Model Content

[0004] The purpose of the utility model is to provide a water-cooled arch chain steam boiler to solve the problems of low thermal efficiency, complex structure, and difficult maintenance faced by traditional steam boilers proposed in the above background technology during design and operation.

[0005] To achieve the above-mentioned purpose, the utility model provides a water-cooled arch chain steam boiler, comprising a furnace body, a boiler drum is provided on the upper part of the furnace body, a furnace is provided on the lower part of the furnace body, a chain grate is installed at the bottom of the furnace body, a front water-cooled arch is installed at the front part of the furnace, and a rear water-cooled arch is installed at the rear part of the furnace. Downcomers are connected to the bottom of both sides of the boiler drum, and the bottom ends of the downcomers are connected to a collecting box. A front smoke box is provided on the outside of one end of the boiler drum, and a rear smoke box is provided on the outside of the other end of the boiler drum. The top of the furnace is connected to the front smoke box.

[0006] Preferably, a ladder is installed on one outer wall of the furnace body.

[0007] Preferably, a plurality of threaded smoke pipes are horizontally installed inside the boiler drum, one end of the threaded smoke pipe is connected to the front smoke box, and the other end of the threaded smoke pipe is connected to the rear smoke box.

[0008] Preferably, a connecting flue is installed on the outer side of the rear smoke box, and an outer end of the connecting flue is connected to an economizer.

[0009] Preferably, the outer wall of the downcomer is in contact with the inner wall of the furnace body.

[0010] Preferably, the front water-cooling arch and the rear water-cooling arch form an eight-shaped shielding structure above the furnace.

[0011] Preferably, the top end of the front water-cooling arch is connected to one end of the boiler drum, and the top end of the rear water-cooling arch is connected to the other end of the boiler drum.

[0012] Preferably, a steam discharge pipe and a pressure control pipeline are installed on the top of the boiler drum.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] This water-cooled arch chain steam boiler utilizes a unique water-cooled arch design combined with a chain grate, significantly improving the boiler's thermal efficiency and operational stability. Specifically, the figure-eight shielding structure formed by the front and rear water-cooled arches above the furnace not only effectively increases the boiler's heated area but also optimizes the heat exchange process within the furnace, resulting in more complete combustion and significantly reduced heat loss. Furthermore, the horizontally mounted threaded flue pipes within the drum further enhance the heat exchange efficiency between the flue gas and water, improving the boiler's overall thermal energy conversion rate.

[0015] Furthermore, the boiler's compact structure makes it easy to maintain. A ladder facilitates routine inspection and maintenance, while the downcomer's close fit to the furnace's inner wall reduces heat loss and improves the boiler's thermal insulation. The economizer, attached to the rear smoke box, fully utilizes flue gas waste heat, further enhancing the boiler's energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a side structural diagram of the present utility model;

[0018] Figure 3 This is a schematic diagram of the top view of the structure of the utility model;

[0019] The meaning of each number in the figure is:

[0020] 1. Boiler drum; 11. Downcomer; 12. Ladder; 13. Threaded smoke pipe; 2. Chain grate; 3. Furnace; 31. Front water-cooling arch; 32. Rear water-cooling arch; 4. Front smoke box; 5. Rear smoke box; 6. Connecting flue; 7. Economizer; 8. Collecting box. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] The utility model provides a water-cooled arch chain steam boiler, such as Figure 1-Figure 3As shown, it includes a furnace body, with a boiler drum 1 provided at the top, a furnace 3 provided at the bottom, a chain grate 2 installed at the bottom of the furnace body, a front water-cooled arch 31 installed at the front of the furnace 3, and a rear water-cooled arch 32 installed at the rear of the furnace 3. Downcomers 11 are connected to the bottom of both sides of the boiler drum 1, and the bottom ends of the downcomers 11 are connected to the header 8. A front smoke box 4 is provided on the outside of one end of the boiler drum 1, and a rear smoke box 5 is provided on the outside of the other end of the boiler drum 1. The top of the furnace 3 is connected to the front smoke box 4. By installing the front water-cooled arch 31 and the rear water-cooled arch 32 at the front and rear of the furnace 3, respectively, an effective shielding structure is formed, which not only increases the heating area of ​​the boiler, but also promotes the optimization of the combustion process in the furnace, allowing the fuel to burn more fully, thereby improving the heat exchange efficiency and combustion efficiency. The boiler drum 1 is located at the top of the furnace body and is connected to the header 8 through the downcomer 11, forming a stable water circulation system. This design not only ensures the structural stability of the boiler during operation, but also helps maintain the water level balance inside the boiler, enhancing the safety of the boiler. The connection design between the top of the furnace 3 and the front smoke box 4, as well as the horizontally installed threaded smoke pipe inside the drum 1 (although not directly mentioned in this paragraph, it can be inferred from the subsequent description), together promote the smooth flow of flue gas and effective heat recovery. This helps to reduce heat loss and improve the overall thermal energy conversion efficiency of the boiler. The overall structural design of the boiler is reasonable and the layout is clear, which is convenient for operators to carry out daily inspections and maintenance work. In particular, the installation position of the chain grate 2 makes the addition of fuel and the cleaning of slag more convenient and quick.

[0023] In this embodiment, a ladder 12 is installed on one side of the outer wall of the furnace body. The provision of the ladder 12 greatly facilitates the operator to perform daily inspection, maintenance and troubleshooting of the boiler, improves work efficiency, and ensures the safety of the operator.

[0024] Specifically, several threaded smoke tubes 13 are horizontally mounted within the boiler drum 1. One end of each threaded smoke tube 13 connects to the front smoke box 4, while the other end connects to the rear smoke box 5. The threaded smoke tube 13 design increases the contact area between the flue gas and the water in the boiler drum, prolonging the flue gas's residence time within the drum and thereby improving heat exchange efficiency. The threaded structure also enhances the mechanical strength of the smoke tube, improving the durability of the boiler.

[0025] Furthermore, a connecting flue 6 is installed on the outside of the rear smoke box 5, and the outer end of the connecting flue 6 is connected to the economizer 7. The connecting flue 6 connects the rear smoke box 5 and the economizer 7, allowing the flue gas to further release its heat before being discharged from the boiler. This heat is absorbed by the economizer 7 and used to preheat the boiler inlet water, thereby improving the overall thermal efficiency and energy utilization of the boiler.

[0026] Furthermore, the outer wall of the downcomer 11 is in contact with the inner wall of the furnace body. The connecting flue 6 connects the rear smoke box 5 with the economizer 7, allowing the flue gas to release further heat before exiting the boiler. This heat is absorbed by the economizer 7 and used to preheat the boiler inlet water, thereby improving the overall thermal efficiency and energy utilization of the boiler.

[0027] Furthermore, the front and rear water-cooling arches 31 and 32 form a figure-eight (S)-shaped shielding structure above the furnace. This not only increases the boiler's heating area but also optimizes airflow distribution within the furnace, ensuring more complete combustion and reducing heat loss. This structure also helps reduce slagging and ash accumulation in the furnace, improving boiler cleanliness and operational stability.

[0028] Furthermore, the top end of the front water-cooling arch 31 is connected to one end of the boiler drum 1 , and the top end of the rear water-cooling arch 32 is connected to the other end of the boiler drum 1 .

[0029] Furthermore, a steam discharge pipe and a pressure control line are installed at the top of the boiler drum 1. The steam discharge pipe is used to discharge steam generated within the drum out of the boiler for user use. The pressure control line is used to monitor and control the pressure within the boiler, ensuring that the boiler operates at a safe pressure and preventing accidents caused by overpressure. This design improves the safety and reliability of the boiler.

[0030] When the water-cooled arch chain steam boiler of this utility model is in use, fuel is first placed on the chain grate 2 located at the bottom of the furnace body. As the chain grate 2 slowly moves, the fuel gradually enters the furnace 3 and burns. The heat generated by the combustion is transferred to the water-cooled walls, front water-cooled arches 31, and rear water-cooled arches 32 in the furnace 3 by radiation and convection. After these water-cooled structures absorb the heat, the heat is removed through the internal water circulation, thus achieving effective cooling of the boiler.

[0031] Simultaneously, the flue gas generated by combustion rises within the furnace 3 and enters the front smoke box 4 through the connection between the top of the furnace 3 and the front smoke box 4. The flue gas then flows through the horizontally mounted threaded smoke pipe 13 within the boiler drum 1, exchanging heat with the water within the threaded smoke pipe 13. During this process, the heat from the flue gas is absorbed by the water, thereby cooling the flue gas and heating the water.

[0032] After heat exchange in the threaded smoke tube 13, the flue gas enters the rear smoke box 5 and enters the economizer 7 through the connecting flue 6. In the economizer 7, the flue gas further releases its heat, which is used to preheat the boiler's inlet water, thereby improving the overall thermal efficiency and energy utilization of the boiler.

[0033] Throughout operation, the boiler drum 1, located at the top of the furnace, is connected to the header 8 via a downcomer 11, forming a stable water circulation system. This system not only ensures the structural stability of the boiler during operation but also helps maintain the water level balance within the boiler. Furthermore, a steam discharge pipe and pressure control line are installed at the top of the boiler drum 1. These pipes discharge the generated steam from the boiler for user use, while also monitoring and controlling the pressure within the boiler to ensure safe operation.

[0034] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A water-cooled arch chain steam boiler, comprising a furnace body, characterized in that: A boiler drum (1) is provided at the upper part of the furnace body, a furnace (3) is provided at the lower part of the furnace body, a chain grate (2) is installed at the bottom of the furnace body, a front water-cooling arch (31) is installed at the front part of the furnace (3), and a rear water-cooling arch (32) is installed at the rear part of the furnace (3). Downcomers (11) are connected to the bottom of both sides of the boiler drum (1), and the bottom end of the downcomer (11) is connected to a collecting box (8). A front smoke box (4) is provided on the outside of one end of the boiler drum (1), and a rear smoke box (5) is provided on the outside of the other end of the boiler drum (1). The top of the furnace (3) is connected to the front smoke box (4).

2. The water-cooled arch chain steam boiler according to claim 1, characterized in that: An escalator (12) is installed on one side outer wall of the furnace body.

3. The water-cooled arch chain steam boiler according to claim 1, characterized in that: A plurality of threaded smoke pipes (13) are horizontally installed inside the boiler drum (1), one end of the threaded smoke pipe (13) is connected to the front smoke box (4), and the other end of the threaded smoke pipe (13) is connected to the rear smoke box (5).

4. The water-cooled arch chain steam boiler according to claim 3, characterized in that: A connecting flue (6) is installed on the outer side of the rear smoke box (5), and an outer end of the connecting flue (6) is connected to an economizer (7).

5. The water-cooled arch chain steam boiler according to claim 1, characterized in that: The outer wall of the downcomer (11) is in contact with the inner wall of the furnace body.

6. The water-cooled arch chain steam boiler according to claim 1, characterized in that: The front water-cooling arch (31) and the rear water-cooling arch (32) form an eight-shaped shielding structure above the furnace.

7. The water-cooled arch chain steam boiler according to claim 1, characterized in that: The top end of the front water-cooling arch (31) is connected to one end of the boiler drum (1), and the top end of the rear water-cooling arch (32) is connected to the other end of the boiler drum (1).

8. The water-cooled arch chain steam boiler according to claim 1, characterized in that: A steam discharge pipe and a pressure control pipeline are installed on the top of the boiler drum (1).

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