Fully premixed combustion water-fire tube steam boiler

Abstract

The utility model relates to the technical field of boilers, in particular to a full-premixing combustion water-fire tube steam boiler which comprises a boiler body, a full-premixing combustor is installed on the outer portion of one side of the boiler body, an upper boiler barrel is installed on the upper portion of the boiler body, a lower boiler barrel is installed on the lower portion of the boiler body, and a hearth is arranged in the boiler body and close to the full-premixing combustor. An upper smoke collecting chamber is installed at the top of the upper furnace barrel, a lower smoke collecting chamber is installed at the bottom of the lower furnace barrel, a plurality of heat exchange sleeves are vertically installed in the furnace body, each heat exchange sleeve comprises an inner pipe and an outer pipe, the inner pipes are located in the outer pipes, and one side of the lower smoke collecting chamber is communicated with the interior of the furnace body. According to the fully premixed combustion water-fire tube steam boiler, the fully premixed combustion technology is adopted, fuel and air are fully mixed according to a certain proportion before combustion, uniform combustible mixed gas is formed, combustion is more sufficient, and the combustion efficiency is improved. The full-premixing combustor is reasonable in design, suspends in a limited space behind a combustion plane, adapts to a smaller hearth space, and meanwhile guarantees stability and uniformity of combustion.

Description

Technical Field

[0001] This utility model relates to the field of boiler technology, specifically to a fully premixed combustion water-fire tube steam boiler. Background Technology

[0002] In the field of boiler technology, with the continuous advancement of urbanization and industrialization, energy demand is constantly increasing, and per capita energy consumption is rising steadily. At the same time, growing environmental awareness is placing higher demands on the energy efficiency and environmental performance of boiler equipment. Traditional boilers often suffer from incomplete combustion, low thermal efficiency, and high pollutant emissions during the combustion process, which not only wastes energy but also exacerbates environmental pollution.

[0003] To address these challenges, fully premixed combustion technology is increasingly being applied in the boiler industry. Fully premixed combustion is an advanced combustion method characterized by the thorough mixing of fuel and air in a specific ratio before combustion to form a homogeneous combustible mixture, which is then burned within a fully premixed burner. This combustion method improves combustion efficiency and reduces pollutants from incomplete combustion, particularly nitrogen oxides (NOx) emissions.

[0004] However, existing water-tube and fire-tube steam boilers still have some shortcomings in terms of structural design and thermal efficiency. For example, some boilers have low heat exchange efficiency, leading to energy waste; at the same time, the NOx emissions generated during the combustion process of some boilers are still high, failing to meet increasingly stringent environmental standards. Utility Model Content

[0005] The purpose of this invention is to provide a fully premixed combustion water-tube steam boiler to solve the problems mentioned in the background art, such as the shortcomings in structural design and thermal efficiency of some water-tube steam boilers.

[0006] To achieve the above objectives, this utility model provides a fully premixed combustion water-tube steam boiler, comprising a furnace body, a fully premixed burner installed on the outside of one side of the furnace body, an upper furnace tube installed on the upper part of the furnace body, a lower furnace tube installed on the lower part of the furnace body, a furnace chamber located inside the furnace body near the fully premixed burner, an upper smoke collection chamber installed at the top of the upper furnace tube, a lower smoke collection chamber installed at the bottom of the lower furnace tube, and a plurality of heat exchange tubes vertically installed inside the furnace body, each heat exchange tube comprising an inner tube and an outer tube, the inner tube being located inside the outer tube, and one side of the lower smoke collection chamber communicating with the interior of the furnace body.

[0007] Preferably, a steam outlet is provided at the top of the furnace cylinder.

[0008] Preferably, the top of the upper smoke collection chamber is provided with a smoke outlet.

[0009] Preferably, a water supply pipe is connected to one side of the lower furnace cylinder, and a water supply pump is installed on the water supply pipe.

[0010] Preferably, the upper end of the outer tube is connected to the upper furnace cylinder, and the lower end of the outer tube is connected to the lower furnace cylinder.

[0011] Preferably, the upper end of the inner tube passes through the upper furnace cylinder and is connected to the upper smoke collection chamber, and the lower end of the inner tube passes through the lower furnace cylinder and is connected to the lower smoke collection chamber.

[0012] Preferably, a heat exchange channel is formed between adjacent heat exchange sleeves.

[0013] Preferably, the heat exchanger has two sets of heat exchangers: a cooling jacket and a flame stabilizing jacket. The cooling jacket is close to the furnace, and the flame stabilizing jacket is far from the furnace.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0015] This fully premixed combustion water-tube steam boiler employs fully premixed combustion technology, where fuel and air are thoroughly mixed in a specific ratio before combustion to form a uniform combustible mixture, resulting in more complete combustion and improved combustion efficiency. The fully premixed burner is rationally designed with a short flame length, suspended in the limited space behind the combustion plane, adapting to a smaller furnace space while ensuring combustion stability and uniformity.

[0016] Several heat exchange tubes, including inner and outer tubes, are vertically installed inside the furnace, forming a highly efficient heat exchange structure. The inner tubes serve as waste heat channels for flue gas, while the space between the outer and inner tubes acts as a water flow channel, allowing for thorough heat exchange between the waste heat from the flue gas and the water flow, thus improving heat exchange efficiency. The heat exchange channels formed between adjacent heat exchange tubes further increase the heat exchange area, ensuring a large evaporation rate even with a relatively small amount of aqueous solution.

[0017] Fully premixed combustion technology reduces pollutants from incomplete combustion, particularly nitrogen oxides (NOx) emissions. The boiler is equipped with cooling and flame stabilizing jackets. The cooling jackets, located close to the furnace, cool the combustion gases, effectively reducing the NOx content generated after combustion. The flame stabilizing jackets stabilize combustion, further suppressing NOx formation.

[0018] The boiler has a compact structure with a rational layout of components such as the boiler body, upper furnace drum, lower furnace drum, upper smoke collection chamber, and lower smoke collection chamber, facilitating installation and maintenance. The heat exchange tubes are composed of multiple rows arranged in parallel, with adjacent rows staggered to improve space utilization. The design of the feedwater pipes and pump ensures continuous water supply to the boiler, enhancing its operational stability. Attached Figure Description

[0019] Figure 1This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 2 This utility model Figure 1 A magnified view of a portion of point A in the middle;

[0021] Figure 3 This is a schematic diagram of the heat exchange sleeve in this utility model;

[0022] The meanings of the labels in the diagram are as follows:

[0023] 1. Furnace body; 2. Upper furnace drum; 21. Steam outlet; 3. Lower furnace drum; 31. Water supply pipe; 32. Water supply pump; 4. Fully premixed burner; 5. Furnace chamber; 6. Upper smoke collection chamber; 61. Smoke outlet; 7. Lower smoke collection chamber; 8. Heat exchanger jacket; 81. Inner tube; 82. Outer tube. Detailed Implementation

[0024] 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.

[0025] This utility model provides a fully premixed combustion water-tube steam boiler, such as... Figures 1-3As shown, the boiler includes a furnace body 1. A fully premixed burner 4 is installed on one side of the furnace body 1. An upper furnace cylinder 2 is installed on the upper part of the furnace body 1, and a lower furnace cylinder 3 is installed on the lower part of the furnace body 1. A furnace chamber 5 is located inside the furnace body 1 near the fully premixed burner 4. An upper smoke collection chamber 6 is installed at the top of the upper furnace cylinder 2, and a lower smoke collection chamber 7 is installed at the bottom of the lower furnace cylinder 3. Several heat exchanger tubes 8 are vertically installed inside the furnace body 1. Each heat exchanger tube 8 includes an inner tube 81 and an outer tube 82, with the inner tube 81 located inside the outer tube 82. One side of the lower smoke collection chamber 7 communicates with the interior of the furnace body 1. The furnace body 1, as the main body of the boiler, is compact and robust, providing a reliable foundation for the stable operation of the boiler. The fully premixed burner 4 installed on one side of the furnace body 1 facilitates fuel input and combustion process control, improving the ease of boiler operation. The upper part of the furnace body 1 is equipped with an upper furnace drum 2, and the lower part with a lower furnace drum 3. This layered design facilitates the flow of flue gas and the transfer of heat, improving the boiler's thermal efficiency. Inside the furnace body 1, near the fully premixed burner 4, is a furnace chamber 5. The design of the furnace chamber 5 is adapted to the characteristics of fully premixed combustion, ensuring complete fuel combustion and efficient heat utilization. An upper smoke collection chamber 6 is installed at the top of the upper furnace drum 2, and a lower smoke collection chamber 7 is installed at the bottom of the lower furnace drum 3. The design of the smoke collection chambers facilitates the collection and emission of flue gas, reducing flue gas retention and pollution. Several heat exchange tubes 8 are vertically installed inside the furnace body 1. Each heat exchange tube 8 includes an inner tube 81 and an outer tube 82, with the inner tube 81 located inside the outer tube 82. This tube-type design increases the heat exchange area and improves heat exchange efficiency. The structure of the heat exchange tubes 8 allows for sufficient heat exchange between the waste heat of the flue gas and the water flow, further improving the boiler's thermal utilization rate. One side of the lower flue gas chamber 7 is connected to the interior of the furnace body 1. This design ensures smooth exhaust of flue gas and reduces resistance during boiler operation.

[0026] In this embodiment, a steam outlet 21 is provided at the top of the upper furnace drum 2. This design allows the steam generated by the boiler to be discharged smoothly, meeting the steam supply requirements and improving the practicality and efficiency of the boiler.

[0027] Specifically, the top of the upper smoke collection chamber 6 is equipped with a smoke outlet 61. This structure ensures that the flue gas can be discharged from the boiler in an orderly manner, reducing the retention of flue gas, which is conducive to the stable operation of the boiler and environmental protection.

[0028] Furthermore, a water supply pipe 31 is connected to one side of the lower furnace drum 3, and a water supply pump 32 is installed on the water supply pipe 31. This design ensures continuous water supply to the boiler, enabling the boiler to operate continuously and stably, and improving the boiler's reliability and durability.

[0029] Furthermore, the upper end of the outer tube 82 is connected to the upper furnace drum 2, and the lower end of the outer tube 82 is connected to the lower furnace drum 3. This structure allows the water flow to circulate inside the boiler, making full use of the heat inside the boiler and improving heat exchange efficiency.

[0030] Furthermore, the upper end of the inner tube 81 passes through the upper furnace cylinder 2 and is connected to the upper smoke collection chamber 6, while the lower end of the inner tube 81 passes through the lower furnace cylinder 3 and is connected to the lower smoke collection chamber 7. This design allows the flue gas to flow orderly inside the boiler and to exchange heat fully with the water flow, further improving the boiler's thermal efficiency.

[0031] Furthermore, a heat exchange channel is formed between adjacent heat exchange tubes 8. This structure increases the heat exchange area, allowing the waste heat from the flue gas to be more fully absorbed by the water flow, thereby improving the boiler's energy utilization rate.

[0032] Furthermore, the heat exchanger tube 8 consists of two sets: a cooling tube and a flame stabilizing tube. The cooling tube is close to the furnace, while the flame stabilizing tube is far from the furnace. This effectively reduces the temperature of the combustion gases and decreases NOx formation; the flame stabilizing tube, being far from the furnace, stabilizes combustion, further improving the boiler's combustion efficiency and environmental performance.

[0033] In operation, the fully premixed combustion water-tube steam boiler of this invention first introduces fuel through the fully premixed burner 4, where it is fully mixed with air in a specific ratio to form a homogeneous combustible mixture. This combustible mixture then burns within the furnace 5, releasing a large amount of heat energy. The furnace 5 is designed to accommodate the characteristics of fully premixed combustion, ensuring complete fuel combustion and efficient heat utilization. The high-temperature flue gas generated during combustion flows within the furnace 5, providing a heat source for subsequent heat exchange processes.

[0034] High-temperature flue gas flows out of the furnace 5 and enters the gap between the heat exchange tubes 8. After initial cooling and flame stabilization, it then enters the lower smoke collection chamber 7 and the inner tube 81. The high-temperature flue gas flows in the inner tube 81 and exchanges heat with the water flow in the outer tube 82. The water flows in the water flow channel between the inner wall of the outer tube 82 and the outer wall of the inner tube 81, absorbing the heat from the flue gas. Finally, it is discharged from the upper smoke collection chamber 6. In the upper smoke collection chamber 6, the flue gas is further cooled and then discharged from the boiler in an orderly manner through the flue gas outlet 61, reducing flue gas retention and pollution.

[0035] A feedwater pipe 31 is connected to one side of the lower furnace drum 3, and a feedwater pump 32 is installed on the feedwater pipe 31. This design ensures continuous water supply to the boiler, enabling it to operate stably and continuously. Water flows into the lower furnace drum 3 from the feedwater pipe 31, and then flows upward in the water flow channel of the outer pipe 82, gradually heating up by absorbing heat from the flue gas. When the water temperature reaches the boiling point, steam is generated in the upper furnace drum 2. The steam is smoothly discharged through the steam outlet 21 at the top of the upper furnace drum 2, meeting the steam supply requirements. After the steam is discharged, it is collected through the pipeline to form condensate, which is then recycled back into the lower furnace drum 3 inside the boiler, forming a water circulation.

[0036] There are two sets of heat exchanger tubes 8: a cooling tube and a flame stabilizing tube. The cooling tube is close to the furnace 5, effectively reducing the temperature of the combustion gases and decreasing NOx formation. When high-temperature flue gas passes through the cooling tube, its heat is absorbed by the water flow, lowering its temperature and thus inhibiting the formation of thermal nitrogen oxides. The flame stabilizing tube is far from the furnace 5, playing a role in stabilizing combustion. The center of the flame stabilizing tube is aligned with the gap of the adjacent first tube (the gap formed between the cooling tubes), creating a negative pressure when the combustion gas flows out of the flame stabilizing tube, which can re-ignite unburned gases, improving the boiler's combustion efficiency and environmental performance.

[0037] Finally, it should be noted that the electronic components in the premixed fully premixed burner 4 and other components in this embodiment are all general standard parts or parts known to those skilled in the art. Their structure and principle can be learned by those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order between each electrical component in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fully premixed combustion water-tube steam boiler, comprising a boiler body (1), characterized in that: A fully premixed burner (4) is installed on the outside of one side of the furnace body (1). An upper furnace cylinder (2) is installed on the upper part of the furnace body (1). A lower furnace cylinder (3) is installed on the lower part of the furnace body (1). A furnace chamber (5) is provided inside the furnace body (1) near the fully premixed burner (4). An upper smoke collection chamber (6) is installed at the top of the upper furnace cylinder (2). A lower smoke collection chamber (7) is installed at the bottom of the lower furnace cylinder (3). Several heat exchange sleeves (8) are vertically installed inside the furnace body (1). Each heat exchange sleeve (8) includes an inner tube (81) and an outer tube (82). The inner tube (81) is located inside the outer tube (82). One side of the lower smoke collection chamber (7) is connected to the inside of the furnace body (1).

2. The fully premixed combustion water-tube steam boiler according to claim 1, characterized in that: The top of the furnace cylinder (2) is provided with a steam outlet (21).

3. The fully premixed combustion water-tube steam boiler according to claim 1, characterized in that: The top of the upper smoke collection chamber (6) is provided with a smoke outlet (61).

4. The fully premixed combustion water-tube steam boiler according to claim 1, characterized in that: A water supply pipe (31) is connected to one side of the lower furnace cylinder (3), and a water supply pump (32) is installed on the water supply pipe (31).

5. The fully premixed combustion water-tube steam boiler according to claim 1, characterized in that: The upper end of the outer tube (82) is connected to the upper furnace cylinder (2), and the lower end of the outer tube (82) is connected to the lower furnace cylinder (3).

6. The fully premixed combustion water-tube steam boiler according to claim 5, characterized in that: The upper end of the inner tube (81) passes through the upper furnace cylinder (2) and is connected to the upper smoke collection chamber (6), and the lower end of the inner tube (81) passes through the lower furnace cylinder (3) and is connected to the lower smoke collection chamber (7).

7. The fully premixed combustion water-tube steam boiler according to claim 1, characterized in that: A heat exchange channel is formed between adjacent heat exchange sleeves (8).

8. The fully premixed combustion water-tube steam boiler according to claim 1, characterized in that: The heat exchanger sleeve (8) consists of two sets: a cooling sleeve and a flame stabilizing sleeve. The cooling sleeve is close to the furnace, while the flame stabilizing sleeve is far from the furnace.

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