Water-cooled premixing steam boiler

Abstract

This utility model relates to a water-cooled premixed steam boiler, comprising: an upper head, a steam-water separator disposed below the upper head, and a cylinder connected to the bottom of the upper head; a water-cooled premixed burner connected to the left side of the cylinder; a high-temperature convection tube bundle disposed inside the cylinder; a medium-temperature convection tube bundle disposed near the right side of the cylinder; low-temperature tube bundles disposed near the front and rear sides of the cylinder; a membrane wall tube bundle disposed inside the cylinder; a lower head connected to the bottom of the cylinder; and a condenser connected to the right side of the cylinder. The beneficial effects of this utility model are: the flame arrestor tube adopts a large-diameter finned structure design, which ensures sufficient flow area and enhances natural circulation, reduces system wind resistance, and reduces fan operating energy consumption; simultaneously, the flame stabilizer tube adopts a large-diameter water pipe design, further enhancing natural circulation and improving overall structural strength; and the medium-temperature convection tube bundle adopts a finned design, increasing the heat exchange area while reducing the furnace volume.

Description

Technical Field

[0001] This utility model relates to the field of gas-fired boiler technology, specifically to a water-cooled premixed steam boiler. Background Technology

[0002] A water-cooled premixed steam boiler is a type of steam boiler that combines water-cooling technology and premixed combustion technology. The gas and air are thoroughly mixed before entering the burner, resulting in more uniform and complete combustion, improved combustion efficiency, and reduced formation of incomplete combustion products. The burner head consists of water-cooled tube bundles with high heat transfer coefficients. The premixed gas is ejected through narrow slits between the water-cooled tube bundles for combustion, and boiler water is used to cool the flame, significantly reducing the flame temperature.

[0003] In the existing technology, the water-cooled premixed burner flame arrestor tubes of water-cooled premixed steam boilers have few gaps, small flow area, and large gas flow resistance, resulting in high energy consumption of the matching fans; the flame arrestor tubes and flame stabilizer tubes usually use small diameter tubes, which can ensure the necessary number of gaps and flow area, but in fact seriously restricts the possibility of structural optimization; the heat exchange tubes inside the boiler body adopt a bare tube structure, resulting in an excessively large boiler body size. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application and utility model provide a water-cooled premixed steam boiler. The flame arrestor tube adopts a large-diameter finned structure design, which can ensure sufficient flow area, enhance natural circulation, reduce system wind resistance, and reduce fan operating energy consumption. At the same time, the flame stabilizer tube adopts a large-diameter water pipe design, which further enhances natural circulation and improves the overall structural strength. The medium-temperature convection tube bundle adopts a finned design, which increases the heat exchange area while reducing the furnace volume.

[0005] This utility model provides the following technical solution: a water-cooled premixed steam boiler, comprising: an upper head, a steam-water separator disposed below the upper head, and a cylinder connected to the bottom of the upper head, a water-cooled premixed burner connected to the left side of the cylinder, a high-temperature convection tube bundle disposed inside the cylinder, and a medium-temperature convection tube bundle disposed inside the cylinder near the right side.

[0006] As a preferred embodiment of this utility model, the furnace outer low temperature tube bundle is respectively arranged near the front and rear sides of the cylinder, and the cylinder is also provided with a membrane wall tube bundle.

[0007] As a preferred embodiment of this utility model, a lower end cap is connected to the bottom of the cylinder, and a condenser is connected to the right side of the cylinder.

[0008] As a preferred embodiment of this utility model, a boiler tube plate is bolted to the bottom of the cylinder, and a fan is installed on the left side of the water-cooled premixed burner, while a control cabinet is installed on the right side of the cylinder near the top.

[0009] As a preferred embodiment of this utility model, the water-cooled premixed burner consists of a mixer, a flow equalization device, a flame arrestor tube, and a flame stabilizer tube.

[0010] As a preferred embodiment of this invention, the medium-temperature convection tube bundle adopts a finned tube structure.

[0011] As a preferred embodiment of this utility model, the flame arrestor tube is composed of large-diameter finned tubes. The finned tubes are arranged at equal intervals between the upper and lower fins to form a regular large-area gas flow channel structure. The two ends of the finned tubes are pressed flat so that each pair of finned tubes can fit tightly together. The flame stabilizer tube is composed of a large-diameter water pipe and is located in front of the flame arrestor tube.

[0012] The beneficial effects of this invention are as follows: The flame arrestor tube adopts a large-diameter finned structure design, which ensures sufficient flow area, enhances natural circulation, reduces system wind resistance, and reduces fan operating energy consumption. Simultaneously, the flame stabilizing tube adopts a large-diameter water pipe design, further enhancing natural circulation and improving overall structural strength. The medium-temperature convection tube bundle adopts a finned design, increasing the heat exchange area while reducing the furnace volume. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the structure of the water-cooled premixed burner of this utility model; Figure 4 This is a cross-sectional view of the flame arrestor tube and flame stabilizer tube of this utility model; Figure 5 This is a schematic diagram of the structure of the flame arrestor tube of this utility model; Figure 6 This is a schematic diagram of the structure of the medium-temperature convection tube bundle of this utility model; In the diagram: 1. Upper head; 2. Steam-water separator; 3. Boiler shell; 4. Water-cooled premixed burner; 401. Mixer; 402. Flow equalization device; 403. Flame arrestor tube; 404. Flame stabilizer tube; 5. High-temperature convection tube bundle; 6. Medium-temperature convection tube bundle; 7. Low-temperature tube bundle outside the furnace; 8. Membrane wall tube bundle; 9. Lower head; 10. Condenser; 11. Boiler tube sheet; 12. Fan; 13. Control cabinet. Detailed Implementation

[0014] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0015] Example like Figures 1 to 6 As shown, a water-cooled premixed steam boiler includes: an upper head 1, a steam-water separator 2 disposed below the upper head 1, and a cylinder 3 connected to the bottom of the upper head 1. A water-cooled premixed burner 4 is connected to the left side of the cylinder 3. A high-temperature convection tube bundle 5 is disposed inside the cylinder 3, and a medium-temperature convection tube bundle 6 is disposed inside the cylinder 3 near the right side.

[0016] In this embodiment, a furnace-external low-temperature tube bundle 7 is respectively arranged near the front and rear sides inside the cylinder 3, and a membrane wall tube bundle 8 is arranged inside the cylinder 3. A lower end cap 9 is connected to the bottom of the cylinder 3, and a condenser 10 is connected to the right side of the cylinder 3. A boiler tube plate 11 is bolted to the bottom of the cylinder 3, and a fan 12 is arranged on the left side of the water-cooled premixed burner 4. A control cabinet 13 is arranged on the right side of the cylinder 3 near the top.

[0017] In this embodiment, the water-cooled premixed burner 4 consists of a mixer 401, a flow equalization device 402, a flame arrestor tube 403, and a flame stabilizer tube 404. The medium-temperature convection tube bundle adopts a finned tube structure, and the flame arrestor tube 403 is composed of large-diameter finned tubes. The finned tubes are arranged with equal spacing between the upper and lower fins to form a regular large-area gas flow channel structure. The two ends of the finned tubes are pressed flat to ensure that each pair of finned tubes can fit tightly together. The flame stabilizer tube 404 is composed of a large-diameter water pipe and is located in front of the flame arrestor tube 403. The flame arrestor tube 403 adopts a large-diameter finned structure design, which can ensure sufficient flow area, enhance natural circulation, reduce system wind resistance, and reduce fan operating energy consumption. At the same time, the flame stabilizer tube 404 adopts a large-diameter water pipe design, which further enhances natural circulation and improves the overall structural strength. The medium-temperature convection tube bundle 6 adopts a finned design, which increases the heat exchange area while reducing the furnace volume.

[0018] Implementation Plan: The water-cooled premixed burner 4 consists of a mixer 401, a flow equalization device 402, a flame arrestor tube 403, and a flame stabilizer tube 404. The mixed gas undergoes proportional mixing of fuel and oxygen within the mixer 401. First, the flow equalization device 402, with its porous structure, achieves initial flow field uniformity. Then, it enters the flame arrestor tube 403 for secondary uniformity, and finally ignites and burns in front of the flame stabilizer tube 404. The flame arrestor tube 403 is composed of large-diameter finned tubes, with the upper and lower fins arranged at equal intervals to form a regular, large-area gas flow channel structure. The ends of the finned tubes are pressed flat to ensure a tight fit between any two finned tubes. The flame stabilizer tube 404, composed of a large-diameter water pipe, is located in front of the flame arrestor tube 403.

[0019] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0020] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A water-cooled premixed steam boiler, characterized in that, include: The upper head has a steam-water separator installed below it, and a cylinder is connected to the bottom of the upper head. A water-cooled premixed burner is connected to the left side of the cylinder. A high-temperature convection tube bundle is installed inside the cylinder, and a medium-temperature convection tube bundle is installed near the right side of the cylinder.

2. The water-cooled premixed steam boiler according to claim 1, characterized in that, Low-temperature tube bundles are installed near the front and rear sides of the furnace body, and membrane wall tube bundles are installed inside the furnace body.

3. A water-cooled premixed steam boiler according to claim 1, characterized in that, The bottom of the cylinder is connected to a lower end cap, and the right side of the cylinder is connected to a condenser.

4. A water-cooled premixed steam boiler according to claim 1, characterized in that, The boiler tube sheet is bolted to the bottom of the cylinder, and a fan is installed on the left side of the water-cooled premixed burner, while a control cabinet is installed on the right side of the cylinder near the top.

5. A water-cooled premixed steam boiler according to claim 1, characterized in that, The water-cooled premixed burner consists of a mixer, a flow equalization device, a flame arrestor tube, and a flame stabilizer tube.

6. A water-cooled premixed steam boiler according to claim 1, characterized in that, The medium-temperature convection tube bundle adopts a finned tube structure.

7. A water-cooled premixed steam boiler according to claim 6, characterized in that, The flame arrestor tube is composed of large-diameter finned tubes. The finned tubes are arranged at equal intervals between the upper and lower fins to form a regular large-area gas flow channel structure. The two ends of the finned tubes are pressed flat so that each pair of finned tubes can fit tightly together. The flame stabilizer tube is composed of a large-diameter water pipe and is located in front of the flame arrestor tube.

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