Combined water-cooled premixing steam boiler

Abstract

The utility model relates to a boiler technical field, concretely is a kind of combined water-cooled premix steam boiler, including boiler body, the outside of including boiler body is provided with steam-water separator, one side inside boiler body is equipped with full premix burner, the combustion mouth of full premix burner is provided with water collecting tank, the upper portion of water collecting tank is provided with steam collecting chamber, steam collecting chamber is connected to steam-water separator by steam outlet pipe, the bottom of steam-water separator is connected with downcomer, and downcomer is communicated with water collecting tank below;Water collecting tank upper side is connected with water supply pipe.The combined water-cooled premix steam boiler, make gas and air mix fully before entering combustion mouth, guarantee combustion more fully, improve the combustion efficiency, reduce the waste of fuel.Meanwhile, water collecting tank top is communicated with steam collecting chamber by heat exchange pipe, and the flue gas in the inside of boiler body can heat the water in water collecting tank by heat exchange pipe, fully utilizes the flue gas waste heat, further improves the thermal efficiency of whole boiler, and reduces energy consumption.

Description

Technical Field

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

[0002] In today's industrial production and daily life, boilers, as important heat energy supply equipment, directly affect energy efficiency and environmental pollution levels. With increasingly stringent environmental protection requirements and rising energy costs, the development of efficient and low-pollution boiler technologies has become an urgent need for the industry.

[0003] Traditional gas-fired boilers are mainly classified into water-tube boilers and fire-tube boilers according to the working fluid flow method. For example, the common WNS series fire-tube gas-fired boilers, due to the pressure-bearing capacity limitations of the tube sheet structure, typically have a capacity of no more than 20 tons, making it difficult to meet the needs of large-scale production. In some large chemical enterprises and food processing plants, such small-capacity boilers cannot provide sufficient steam. While the SZS series water-tube gas-fired boilers have a relatively high evaporation capacity, their double-drum structure requires all heat exchange tube bundles to be welded to the drum at both ends. This welding work is extremely labor-intensive and requires very high quality, which not only increases manufacturing costs but may also affect the safe operation of the boiler due to welding quality problems. In addition, both of these traditional boilers require the addition of a steel frame structure for overall support on the outside of the boiler body, which consumes a large amount of additional steel and limits the overall stability and seismic performance of the boiler.

[0004] In recent years, surface burner technology has developed rapidly. Types such as water-cooled burners, porous ceramic plate burners, and metal fiber or wire mesh burners offer high adjustability, uniform flames, and flame temperatures below 1100℃, effectively suppressing the formation of thermal nitrogen oxides (NOx), resulting in NOx emissions below 30mg, meeting the latest environmental standards. As a type of surface burner, the planar burner only requires one wall of the boiler for installation and is widely used in small-capacity boilers such as gas-fired hot water boilers and gas-fired wall-hung boilers. However, in the pressurized gas-fired boiler market, the application of related technologies remains relatively limited. For example, the high-power water-cooled premixed steam boiler mentioned in reference document CN202323655981, while addressing some issues of existing technologies, still has room for optimization in its overall structure. Further improvements are needed in achieving more efficient steam-water separation, further reducing energy consumption, and minimizing pollutant emissions. Utility Model Content

[0005] The purpose of this invention is to provide a combined water-cooled premixed steam boiler to address the issues raised in the background art regarding how to achieve more efficient steam-water separation, further reduce energy consumption, and reduce pollutant emissions, which still require further improvement.

[0006] To achieve the above objectives, this utility model provides a combined water-cooled premixed steam boiler, including a boiler body, a steam-water separator disposed on the outer side of the boiler body, a fully premixed burner installed on one side inside the boiler body, a water collection tank disposed at the combustion port of the fully premixed burner, a steam collection chamber disposed on the upper part of the water collection tank, the steam collection chamber being connected to the steam-water separator via a steam outlet pipe, a downcomer connected to the bottom of the steam-water separator, the downcomer communicating with the lower part of the water collection tank; and a water supply pipe connected to the upper side of the water collection tank.

[0007] This setup, by installing a steam-water separator on the outside of the boiler body, in conjunction with the internal fully premixed burner, water collection tank, and steam collection chamber, constructs a complete steam-water circulation system. The fully premixed burner ensures thorough mixing of fuel gas and air before combustion, improving combustion efficiency; the water collection tank collects water, the steam collection chamber collects steam, and the steam-water separator separates the moisture from the steam. The separated water flows back to the water collection tank through a downcomer, forming a closed-loop circulation. The makeup water pipe is used to replenish water losses in the system.

[0008] Preferably, a water supply pipe is connected to the upper side of the water collection tank.

[0009] This design ensures that the water supply pipe is connected to the upper side of the water collection tank, allowing the water supply to directly enter the upper area of ​​the tank and mix thoroughly with the hot water inside. This prevents cold water from directly impacting the bottom of the tank and affecting system stability.

[0010] Preferably, one end of the water supply pipe is connected to an external water source, and the other end extends into the water collection tank and has several branch outlets.

[0011] This feature involves extending the water supply pipe into the water collection tank and opening several branch outlets to disperse the supply water into multiple streams, thereby increasing the contact area and mixing effect between the supply water and the hot water in the tank.

[0012] Preferably, there are two water collection tanks arranged one above the other, separated by a partition, with transition cavities provided on the upper and lower sides of the partition.

[0013] This design employs two vertically positioned water collection tanks separated by a partition, with transition chambers on either side of the partition. This structure increases the water flow path and heating area, allowing water to flow between the different collection tanks and transition chambers, thus extending the heating time.

[0014] Preferably, an upper end cap and a lower end cap are installed at the upper and lower ends of the boiler body, respectively, and a flue gas outlet is provided on one side of the boiler body.

[0015] This design involves installing end caps at both the top and bottom of the boiler body, forming a closed cylindrical structure. This ensures that the connection between the end caps and the cylindrical body is only subject to tensile force, making the stress distribution simple and clear. An exhaust port is located on one side, rationally planning the flow path of the flue gas.

[0016] Preferably, a drain pipe is connected to one side of the bottom of the water collection tank.

[0017] This feature connects to a drain pipe on one side of the bottom of the water collection tank, facilitating the regular removal of impurities and dirt deposited in the tank and preventing the accumulation of impurities from affecting water quality and heat exchange efficiency.

[0018] Preferably, the top of the water collection tank is connected to the steam collection chamber via a heat exchange pipe. The flue gas inside the boiler body heats the water in the water collection tank through the heat exchange pipe, and the steam generated is collected through the steam collection chamber.

[0019] This feature connects the top of the water collection tank to the steam collection chamber via heat exchange tubes. When the high-temperature flue gas in the boiler passes through the heat exchange tubes, it transfers heat to the water inside the tubes, heating and vaporizing the water. The resulting steam rises and enters the steam collection chamber for collection.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] In this combined water-cooled premixed steam boiler, the fully premixed burner ensures thorough mixing of fuel gas and air before they enter the combustion chamber, guaranteeing more complete combustion, improving combustion efficiency, and reducing fuel waste. Simultaneously, the top of the water collection tank is connected to the steam collection chamber via heat exchange tubes, allowing the flue gas inside the boiler to heat the water in the collection tank, fully utilizing the waste heat of the flue gas, further enhancing the overall boiler's thermal efficiency and reducing energy consumption.

[0022] The circulation system, consisting of a steam-water separator, steam outlet pipe, downcomer, and water collection tank, can efficiently separate steam and water. The separated water returns to the water collection tank through the downcomer, ensuring stable water circulation, preventing water carryover in the steam, ensuring the quality of the output steam, and improving the efficiency and safety of steam use.

[0023] The water supply pipe connects to an external water source at one end and extends into the water collection tank at the other end, with several branch outlets. This design ensures a uniform and stable supply of water to the water collection tank, maintaining a stable water level inside the boiler. Meanwhile, the drain pipe connected to the bottom of the water collection tank facilitates the timely removal of impurities and scale from the water, ensuring the quality of the water inside the boiler, extending its service life, and reducing malfunctions and maintenance costs caused by water quality issues.

[0024] Two water collection tanks, positioned one above the other, are separated by a partition, with transition chambers on both the upper and lower sides of the partition. This structural design increases the water flow path and heating area, further enhancing the heat exchange effect. Meanwhile, the end cap design at both ends of the boiler body and the rational layout of the flue gas outlets enhance the stability of the boiler structure, optimize the flue gas emission process, help reduce flue gas temperature, and improve energy utilization. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the boiler body in this utility model;

[0027] Figure 3 This is a schematic diagram of the water supply pipe in this utility model;

[0028] The meanings of the labels in the diagram are as follows:

[0029] 1. Boiler body; 11. Steam collection chamber; 12. Water collection tank; 13. Water supply pipe; 131. Diversion port; 14. Baffle plate; 15. Transition chamber; 16. Sewage pipe; 17. Flue gas outlet; 18. Heat exchange tube; 2. Steam-water separator; 3. Fully premixed burner; 4. Steam outlet pipe; 5. Downcomer. Detailed Implementation

[0030] 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.

[0031] This utility model provides a combined water-cooled premixed steam boiler, such as Figure 1 As shown, the boiler includes a boiler body 1, a steam-water separator 2 is installed on the outside of the boiler body 1, a fully premixed burner 3 is installed on one side inside the boiler body 1, a water collection tank 12 is installed at the combustion port of the fully premixed burner 3, a steam collection chamber 11 is installed on the upper part of the water collection tank 12, the steam collection chamber 11 is connected to the steam-water separator 2 through a steam outlet pipe 4, a downcomer 5 is connected to the bottom of the steam-water separator 2, and the downcomer 5 is connected to the lower part of the water collection tank 12; a water supply pipe 13 is connected to the upper side of the water collection tank 12.

[0032] A complete steam-water circulation system is constructed by installing a steam-water separator 2 on the outside of the boiler body 1, in conjunction with the internal fully premixed burner 3, water collection tank 12, and steam collection chamber 11. The fully premixed burner 3 ensures thorough mixing of fuel gas and air before combustion, improving combustion efficiency. The water collection tank 12 collects water, and the steam collection chamber 11 collects steam. The steam collection chamber 11 is connected to the steam-water separator 2 via a steam outlet pipe 4 for steam-water separation. The separated water flows back to the bottom of the water collection tank 12 through a downcomer 5 connected to the bottom of the steam-water separator 2, forming a closed-loop circulation. A makeup water pipe 13 is connected to the upper side of the water collection tank 12 to replenish water losses in the system. This design achieves efficient steam-water separation and circulation, improves steam quality and energy utilization efficiency, and the fully premixed combustion method reduces nitrogen oxide emissions, meeting environmental protection requirements.

[0033] In this embodiment, as Figure 1 As shown, a water supply pipe 13 is connected to the upper side of the water collection tank 12.

[0034] The water supply pipe 13 is connected to the upper side of the water collection tank 12, ensuring that the supply water can directly enter the upper area of ​​the water collection tank 12 and fully mix with the hot water in the tank. This avoids cold water directly impacting the bottom of the tank, which could affect system stability. The optimized water supply method makes the process smoother, reduces the impact on the system's thermal balance, and improves the stability of boiler operation.

[0035] Specifically, such as Figure 3 As shown, one end of the water supply pipe 13 is connected to an external water source, and the other end extends into the water collection tank 12 and has several branch outlets 131.

[0036] One end of the water supply pipe 13 is connected to an external water source, and the other end extends into the water collection tank 12 with several branch outlets 131. This disperses the water supply into multiple streams, increasing the contact area and mixing effect between the water supply and the hot water in the tank. This further improves the uniformity and mixing efficiency of the water supply, avoids problems of localized excessively low or high water temperatures, ensures the consistency of water temperature within the water collection tank 12, and is conducive to the stable generation of high-quality steam.

[0037] Furthermore, such as Figure 2 As shown, there are two water collection tanks 12, which are arranged one above the other. The water collection tanks 12 are separated by a partition 14, and transition cavities 15 are provided on the upper and lower sides of the partition 14.

[0038] Two water collection tanks 12 are arranged one above the other and separated by a partition 14. Transition cavities 15 are also provided on the upper and lower sides of the partition 14. This structure increases the water flow path and heating area, allowing water to flow between the different water collection tanks 12 and the transition cavities 15, thus extending the heating time.

[0039] The heat exchange process is enhanced, improving the water heating efficiency, thereby increasing the overall thermal efficiency and steam output of the boiler.

[0040] Furthermore, such as Figure 2 As shown, the upper end cap and lower end cap are respectively installed at the upper and lower ends of the boiler body 1, and a flue gas outlet 17 is provided on one side of the boiler body 1.

[0041] The boiler body 1 has upper and lower end caps installed at its top and bottom, respectively, forming a closed cylindrical structure. This ensures that the connection between the upper and lower end caps and the cylindrical body is only subject to tensile force, making the stress distribution simple and clear. A flue gas outlet 17 is provided on one side of the boiler body 1, rationally planning the flow path of the flue gas. This structural design enhances the boiler's structural stability and safety, simplifies stress analysis, and extends the boiler's service life. Simultaneously, the optimized flue gas path helps reduce flue gas resistance and improve flue gas efficiency.

[0042] Furthermore, such as Figure 2 As shown, a drain pipe 16 is connected to one side of the bottom of the water collection tank 12.

[0043] A drain pipe 16 is connected to one side of the bottom of the water collection tank 12 to facilitate the regular removal of impurities and scale deposited in the water collection tank 12, preventing the accumulation of impurities from affecting water quality and heat exchange efficiency. This ensures the quality of the water inside the boiler, reduces the corrosion and blockage of heat exchange tubes and other components by scale, extends the service life of the equipment, and reduces maintenance costs.

[0044] Furthermore, such as Figure 2 As shown, the top of the water collection tank 12 is connected to the steam collection chamber 11 through the heat exchange pipe 18. The flue gas inside the boiler body 1 heats the water in the water collection tank 12 through the heat exchange pipe 18, and the steam generated is collected through the steam collection chamber 11.

[0045] The top of the water collection tank 12 is connected to the steam collection chamber 11 via heat exchange pipe 18. The flue gas inside the boiler body 1 heats the water in the water collection tank 12 through the heat exchange pipe 18. The water generates steam after being heated and is collected through the steam collection chamber 11. This fully utilizes the waste heat of the flue gas, improves energy efficiency, achieves a highly efficient heat exchange process, and ensures the stable generation and collection of steam.

[0046] In operation, the combined water-cooled premixed steam boiler of this invention first connects one end of the water supply pipe 13 to an external water source, and the other end extends into the water collection tank 12, dispersing water through the diversion port 131. Since the water supply pipe 13 is connected to the upper side of the water collection tank 12, the newly added water can fully mix with the hot water in the tank, avoiding any impact on the system's thermal balance. The water in the water collection tank 12 then becomes the basic working fluid for the entire steam-water circulation system during subsequent operation.

[0047] The fully premixed burner 3, installed on one side inside the boiler body 1, begins operation. The fuel gas and air are thoroughly mixed within the premixed burner 3 before entering the combustion port. The mixed gas then burns intensely at the combustion port, releasing a large amount of heat. Compared to traditional combustion methods, this fully premixed combustion method results in more complete combustion, effectively improving combustion efficiency while reducing nitrogen oxide emissions.

[0048] The heat generated by the fully premixed burner 3 first heats the water in the water collection tank 12 at the combustion port. Since there are two water collection tanks 12, arranged vertically and separated by a partition 14, the transition chambers 15 on both sides of the partition 14 increase the water flow path and heating area. The water is gradually heated within the water collection tank 12, and as heat is continuously transferred, the water reaches its boiling point and begins to vaporize, producing steam. Simultaneously, the flue gas inside the boiler body 1 transfers its waste heat to the water in the water collection tank 12 through the heat exchange tubes 18 at the top of the water collection tank 12, further promoting water vaporization and achieving full utilization of the waste heat, thus improving energy efficiency. The generated steam rises to the steam collection chamber 11 at the top of the water collection tank 12 for collection.

[0049] Steam in the steam collecting chamber 11 is transported to the steam-water separator 2 outside the boiler body 1 through the steam outlet pipe 4. In the steam-water separator 2, the water carried in the steam is separated by utilizing the principle of density difference between steam and water. The separated water flows back to the bottom of the water collecting tank 12 through the downcomer 5 at the bottom of the steam-water separator 2, and re-enters the water collecting tank 12 to participate in the circulation, while the separated high-quality steam can be drawn out for external use.

[0050] Throughout the operation, the drain pipe 16 connected to one side of the bottom of the water collection tank 12 can be opened periodically to discharge the impurities and dirt deposited in the water collection tank 12, preventing these impurities from affecting water quality and heat exchange efficiency, ensuring the cleanliness of the water inside the boiler, reducing the corrosion and blockage of the equipment by scale, and maintaining the stable and efficient operation of the boiler.

[0051] The upper and lower end caps installed at both ends of the boiler body 1 form a closed structure with the furnace body, making the connection simple and reliable. After the flue gas generated by combustion heats the water in the water collection tank 12, it is discharged through the flue gas outlet 17 set on one side of the boiler body 1. The reasonable flue gas path planning reduces the flue gas resistance and improves the flue gas efficiency.

[0052] Finally, it should be noted that the electronic components in the boiler body 1 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 known to 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 the electrical components in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0053] 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 combined water-cooled premixed steam boiler, comprising a boiler body (1), characterized in that: The boiler body (1) is equipped with a steam-water separator (2) on its outer side. A fully premixed burner (3) is installed on one side inside the boiler body (1). A water collection tank (12) is provided at the combustion port of the fully premixed burner (3). A steam collection chamber (11) is provided on the upper part of the water collection tank (12). The steam collection chamber (11) is connected to the steam-water separator (2) through a steam outlet pipe (4). A downcomer (5) is connected to the bottom of the steam-water separator (2). The downcomer (5) is connected to the bottom of the water collection tank (12). A water supply pipe (13) is connected to the upper side of the water collection tank (12).

2. The combined water-cooled premixed steam boiler according to claim 1, characterized in that: A water supply pipe (13) is connected to the upper side of the water collection tank (12).

3. The combined water-cooled premixed steam boiler according to claim 1, characterized in that: One end of the water supply pipe (13) is connected to a water source, and the other end extends into the water collection tank (12) and has several branch outlets (131).

4. The combined water-cooled premixed steam boiler according to claim 1, characterized in that: There are two water collection tanks (12), which are arranged one above the other. The water collection tanks (12) are separated by a partition (14), and transition cavities (15) are provided on the upper and lower sides of the partition (14).

5. The combined water-cooled premixed steam boiler according to claim 1, characterized in that: The upper end cap and the lower end cap are respectively installed at the upper and lower ends of the boiler body (1), and a flue gas outlet (17) is provided on one side of the boiler body (1).

6. The combined water-cooled premixed steam boiler according to claim 1, characterized in that: A drain pipe (16) is connected to one side of the bottom of the water collection tank (12).

7. The combined water-cooled premixed steam boiler according to claim 1, characterized in that: The top of the water collection tank (12) is connected to the steam collection chamber (11) through a heat exchange pipe (18). The flue gas inside the boiler body (1) heats the water in the water collection tank (12) through the heat exchange pipe (18), and the steam generated is collected through the steam collection chamber (11).

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