Full-premixing double-layer combustion system of wall-hanging stove

Abstract

The utility model discloses a full-premixing double-layer combustion system of a wall-hanging stove. The full-premixing double-layer combustion system comprises a full-premixing fan, a furnace end, a combustor assembly, a heat exchange coil and an exhaust assembly. The combustor assembly comprises a middle partition plate. The combustion chamber is vertically divided into a primary combustion chamber and a secondary combustion chamber by the middle partition plate; the outer edge of the middle partition plate and the combustion chamber are spaced to form a combustion overflowing space, and the primary combustion cavity communicates with the secondary combustion cavity through the combustion overflowing space. According to the utility model, the upper and lower double-layer heat exchange structure separated by the middle partition plate can enable flue gas to be effectively diffused and covered in the two heat exchange cavities for heat exchange, and the middle partition plate can prevent flames from being directly jetted towards one side, deviating from the furnace end, of the combustion chamber, so that the flames are prevented from intensively combusting the end cover of the combustion chamber.

Description

Technical Field

[0001] This utility model relates to the field of wall-hung boiler technology, and in particular to a fully premixed double-layer combustion system for a wall-hung boiler. Background Technology

[0002] A fully premixed gas wall-hung boiler refers to a boiler where the gas and air are fully mixed before entering the combustion chamber, allowing for complete combustion. This method reduces the amount of gas consumed, thereby saving energy and reducing costs. For example, patent number CN208547115U discloses a fully premixed condensing wall-hung boiler. It includes a fully premixed fan with air and gas passages, an air intake burner, a combustion chamber, heat exchange coils inside the combustion chamber, and an exhaust passage. The fully premixed fan mixes the gas and air and pumps it into the combustion chamber through the burner for combustion, exchanging heat with water in the heat exchange coils. However, existing fully premixed gas wall-hung boilers have the following drawbacks:

[0003] Its combustion chamber is a complete combustion cavity, with heat exchange coils coiled inside the combustion chamber. After one heat exchange process, it is output from the exhaust duct. The heat exchange path between the combustion flue gas and the heat exchange coil in the combustion chamber is relatively simple, and the heat exchange efficiency between the flue gas and the heat exchange coil still needs to be improved. Moreover, the flame is directly sprayed from the furnace head to the other end of the combustion chamber, and the flame is concentrated in the combustion chamber to avoid burning the end of the combustion chamber away from the furnace head. The flue gas is also difficult to diffuse and cover the entire combustion chamber.

[0004] Therefore, further improvements are needed. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a fully premixed double-layer combustion system for a wall-hung boiler.

[0006] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a fully premixed double-layer combustion system for a wall-hung boiler, including: a fully premixed fan, a burner head, a burner assembly, a heat exchange coil and an exhaust assembly;

[0007] The burner assembly surrounds a combustion chamber, and the heat exchange coil is disposed within the combustion chamber; the burner head and the exhaust assembly are respectively disposed at the upper and lower ends of the combustion chamber; the burner head is connected to the fully premixed fan, which can send the mixed gas toward the combustion chamber; the flue gas in the combustion chamber can be discharged through the exhaust assembly.

[0008] The burner assembly includes an intermediate partition; the intermediate partition divides the combustion chamber into a primary combustion chamber and a secondary combustion chamber; the outer edge of the intermediate partition is spaced from the combustion chamber to form a combustion flow space, and the primary combustion chamber and the secondary combustion chamber are connected through the combustion flow space.

[0009] Optionally, the combustion chamber is cylindrical; the heat exchange coil includes an inlet pipe, a coil section, and an outlet pipe connected in sequence; the coil section is spiral-shaped, with its outer periphery located close to the inner wall of the combustion chamber; the outer periphery of the intermediate partition is located close to the inner wall of the coil section.

[0010] Optionally, the water inlet pipe is connected to the lower end of the coil section and passes through the secondary combustion chamber; the water outlet pipe is connected to the upper end of the coil section and passes through the primary combustion chamber.

[0011] Optionally, the coil section has a flat pipe structure, and a flow gap is provided between the upper and lower coil layers.

[0012] Optionally, the intermediate partition is provided with heat insulation cotton.

[0013] Optionally, the burner assembly includes an upper end cover, an annular shell, and a lower end cover; the annular shell is installed between the upper end cover and the lower end cover; the upper end cover and the lower end cover are connected by a plurality of connecting posts; the burner head is installed on the upper end cover, and the exhaust assembly is installed on the lower end cover.

[0014] Optionally, the lower end cover is provided with an exhaust baffle; the exhaust baffle and the lower end cover surround a flat exhaust channel; the exhaust baffle has an exhaust port that connects the secondary combustion chamber and the exhaust channel.

[0015] The beneficial effects of this utility model are as follows: A middle partition divides the combustion chamber into a primary combustion chamber and a secondary combustion chamber. The outer edge of the middle partition forms a combustion flow space with the combustion chamber, and the primary and secondary combustion chambers are connected through this space. The mixed gas output from the burner undergoes primary combustion in the primary combustion chamber and exchanges heat with the heat exchange coils. Subsequently, the flue gas enters the secondary combustion chamber from the combustion flow space and exchanges heat with the heat exchange coils. This utility model, with its middle partition-type double-layer heat exchange structure, allows the flue gas to effectively diffuse and cover both heat exchange chambers for heat exchange. Furthermore, the middle partition prevents the flame from directly spraying towards the side of the combustion chamber away from the burner, avoiding concentrated flame combustion on the end cap of the combustion chamber.

[0016] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1This is a schematic diagram of the structure of the fully premixed dual-layer combustion system of this utility model;

[0019] Figure 2 for Figure 1 Exploded view of the fully premixed dual-stage combustion system;

[0020] Figure 3 for Figure 1 Cross-sectional view of a fully premixed dual-stage combustion system.

[0021] Explanation of key component symbols:

[0022] 10. Fully premixed fan; 20. Burner head; 30. Burner assembly; 31. Combustion chamber; 311. Primary combustion chamber; 312. Secondary combustion chamber; 313. Combustion flow space; 32. Intermediate partition; 33. Insulation cotton; 34. Upper end cover; 35. Annular shell; 36. Lower end cover; 37. Connecting column; 38. Exhaust baffle; 381. Exhaust port; 39. Exhaust duct; 40. Heat exchange coil; 41. Water inlet pipe; 42. Coil section; 43. Water outlet pipe; 50. Exhaust assembly. Detailed Implementation

[0023] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0024] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0025] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0026] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0027] Example

[0028] Reference Figures 1 to 3 The present invention proposes a fully premixed double-layer combustion system for a wall-hung boiler, comprising: a fully premixed fan 10, a burner head 20, a burner assembly 30, a heat exchange coil 40, and an exhaust assembly 50.

[0029] The burner assembly 30 surrounds the combustion chamber 31, and the heat exchange coil 40 is disposed inside the combustion chamber 31; the burner head 20 and the exhaust assembly 50 are respectively disposed at the upper and lower ends of the combustion chamber 31; the burner head 20 is connected to the fully premixed fan 10, which can send the mixed gas to the combustion chamber 31; the flue gas in the combustion chamber 31 can be discharged through the exhaust assembly 50.

[0030] The burner assembly 30 includes an intermediate partition 32; the intermediate partition 32 divides the combustion chamber 31 into a primary combustion chamber 311 and a secondary combustion chamber 312; the outer edge of the intermediate partition 32 and the combustion chamber 31 form a combustion flow space 313, and the primary combustion chamber 311 and the secondary combustion chamber 312 are connected through the combustion flow space 313.

[0031] In this invention, the intermediate partition 32 divides the combustion chamber 31 into a primary combustion chamber 311 and a secondary combustion chamber 312. The outer edge of the intermediate partition 32 forms a combustion flow space 313 with the combustion chamber 31 as a gap, and the primary combustion chamber 311 and the secondary combustion chamber 312 are connected through the combustion flow space 313. The mixed gas output from the burner head 20 undergoes primary combustion in the primary combustion chamber 311 and undergoes primary heat exchange with the heat exchange coil 40. Subsequently, the flue gas enters the secondary combustion chamber 312 from the combustion flow space 313 and undergoes secondary heat exchange with the heat exchange coil 40. In this invention, the upper and lower double-layer heat exchange structure with the intermediate partition 32 allows the flue gas to effectively diffuse and cover the two heat exchange chambers for heat exchange. Furthermore, the intermediate partition can prevent the flame from directly spraying towards the side of the combustion chamber 31 away from the burner head 20, avoiding concentrated flame combustion of the end cap of the combustion chamber 31.

[0032] In this embodiment, the combustion chamber 31 is cylindrical; the heat exchange coil 40 includes an inlet pipe 41, a coil section 42, and an outlet pipe 43 connected in sequence; the coil section 42 is spiral-shaped, with its outer periphery close to the inner wall of the combustion chamber 31; the outer periphery of the intermediate partition 32 is close to the inner wall of the coil section 42. With the cylindrical combustion chamber 31 and the spiral coil section 42, the flame can burn and diffuse evenly within the combustion chamber 31, and the flame can fully contact the coil section 42 for heat exchange on the outer periphery of the inner wall of the combustion chamber 31.

[0033] Specifically, the inlet pipe 41 is connected to the lower end of the coil section 42 and passes through the secondary combustion chamber 312; the outlet pipe 43 is connected to the upper end of the coil section 42 and passes through the primary combustion chamber 311. The primary combustion chamber 311 serves as the main heat exchange chamber, where the flue gas temperature is high, which can fully heat the fluid near the output section of the coil section 42 and the part of the outlet pipe 43, ensuring the output of high-temperature fluid; while in the secondary combustion chamber 312, the flue gas is close to the exhaust assembly 50 and has a lower temperature, so the preheating of the flue gas is used to perform a heat exchange treatment on the low-temperature fluid in the input section of the coil section 42 and the part of the inlet pipe 41.

[0034] In this embodiment, the coil section 42 has a flat pipe structure, and a flow gap is provided between the upper and lower coil layers. The flat pipe structure results in a larger heat exchange cross-sectional area between the unit fluid and the coil, leading to higher heat exchange efficiency.

[0035] Furthermore, in order to reduce the heat of the high-temperature flue gas in the primary combustion chamber 311 from being directly transferred to the secondary combustion chamber 312 and the exhaust passage, the intermediate partition 32 is provided with heat insulation cotton 33.

[0036] In this embodiment, the burner assembly 30 includes an upper end cover 34, an annular shell 35, and a lower end cover 36; the annular shell 35 is installed between the upper end cover 34 and the lower end cover 36; the upper end cover 34 and the lower end cover 36 are connected by a plurality of connecting posts 37; the burner head 20 is installed on the upper end cover 34, and the exhaust assembly 50 is installed on the lower end cover 36. The separate upper end cover 34, annular shell 35, and lower end cover 36 can be easily assembled to form the burner shell component through the connecting posts 37.

[0037] In this embodiment, the lower end cover 36 is provided with an exhaust baffle 38; the exhaust baffle 38 and the lower end cover 36 surround a flat exhaust channel 39; the exhaust baffle 38 has an exhaust port 381 that connects the secondary combustion chamber 312 and the exhaust channel 39. Through the exhaust baffle 38, a flat exhaust channel 39 can be formed at the lower end cover 36; the exhaust baffle 38 can prevent the flue gas in the secondary combustion chamber 312 from flowing directly to the exhaust assembly 50, so that the flue gas can be effectively diffused and cover the secondary combustion chamber 312.

[0038] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A fully premixed double-layer combustion system for a wall-hung boiler, characterized in that, include: Fully premixed fan (10), burner head (20), burner assembly (30), heat exchange coil (40) and exhaust assembly (50); The burner assembly (30) surrounds the combustion chamber (31), and the heat exchange coil (40) is disposed in the combustion chamber (31); the burner head (20) and the exhaust assembly (50) are respectively disposed at the upper and lower ends of the combustion chamber (31); the burner head (20) is connected to the fully premixed fan (10) and can send the mixed gas out of the combustion chamber (31); the flue gas in the combustion chamber (31) can be discharged through the exhaust assembly (50); The burner assembly (30) includes an intermediate partition (32); the intermediate partition (32) divides the combustion chamber (31) vertically into a primary combustion chamber (311) and a secondary combustion chamber (312); the outer edge of the intermediate partition (32) and the combustion chamber (31) form a combustion flow space (313) at a distance, and the primary combustion chamber (311) and the secondary combustion chamber (312) are connected through the combustion flow space (313).

2. The fully premixed dual-layer combustion system of the wall-hung boiler according to claim 1, characterized in that: The combustion chamber (31) is cylindrical; the heat exchange coil (40) includes an inlet pipe (41), a coil section (42) and an outlet pipe (43) connected in sequence; the coil section (42) is spiral-shaped and its outer periphery is located close to the inner wall of the combustion chamber (31); the outer periphery of the intermediate partition (32) is located close to the inner wall of the coil section (42).

3. The fully premixed dual-layer combustion system of the wall-hung boiler according to claim 2, characterized in that: The water inlet pipe (41) is connected to the lower end of the coil section (42) and passes through the secondary combustion chamber (312); the water outlet pipe (43) is connected to the upper end of the coil section (42) and passes through the primary combustion chamber (311).

4. The fully premixed dual-layer combustion system of the wall-hung boiler according to claim 2, characterized in that: The coil section (42) has a flat pipe structure, and a flow gap is provided between the upper and lower coils.

5. The fully premixed dual-layer combustion system of the wall-hung boiler according to claim 1, characterized in that: The intermediate partition (32) is provided with heat insulation cotton (33).

6. The fully premixed dual-layer combustion system of the wall-hung boiler according to claim 1, characterized in that: The burner assembly (30) includes an upper end cover (34), an annular shell (35), and a lower end cover (36); the annular shell (35) is installed between the upper end cover (34) and the lower end cover (36); the upper end cover (34) and the lower end cover (36) are connected by a plurality of connecting posts (37); the burner head (20) is installed on the upper end cover (34), and the exhaust assembly (50) is installed on the lower end cover (36).

7. The fully premixed dual-layer combustion system of the wall-hung boiler according to claim 6, characterized in that: The lower end cover (36) is provided with an exhaust baffle (38); the exhaust baffle (38) and the lower end cover (36) surround a flat exhaust channel (39); the exhaust baffle (38) has an exhaust port (381) that connects the secondary combustion chamber (312) and the exhaust channel (39).

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