Fuel gas conveying device for boiler

Abstract

The utility model relates to the technical field of gas-fired boilers, in particular to a gas conveying device for boilers, which comprises a support frame, a return pipe, a gas conveying pipe group and a rotating structure, a right combustion chamber is fixedly connected inside the support frame, a cyclone separator is fixedly connected inside the support frame and positioned on one side of the combustion chamber, and a gas conveying pipe group is arranged inside the cyclone separator. The top of the combustion chamber is communicated with the cyclone separator through a pipeline, a backflow pipe is installed between the combustion chamber and the cyclone separator, one end of the backflow pipe is fixedly connected with the side wall of the combustion chamber, the other end of the backflow pipe is fixedly connected with the bottom of the cyclone separator, and the top of the cyclone separator is fixedly connected with an exhaust pipe. A fuel gas conveying pipe set used for conveying fuel gas and coal lock gas is installed at the bottom of the combustion chamber, a rotating structure used for mixing the fuel gas and the coal lock gas is installed in the combustion chamber, and the fuel gas conveying device for the boiler has the advantages of being efficient and accurate in fuel gas conveying and efficient and sufficient in fuel gas mixing.

Description

Technical Field

[0001] This utility model relates to the field of gas boiler technology, and in particular to a gas transmission device for boilers. Background Technology

[0002] Boilers play a vital role in industrial production and daily life, including heating and power generation. As a key component of boilers, the performance of gas transmission devices directly affects the boiler's operating efficiency, energy utilization, and pollutant emissions.

[0003] Traditional boiler gas transmission and combustion systems have several shortcomings when dealing with the co-firing of various gases. Firstly, the gas transmission pipeline layout is often unreasonable, making it difficult to achieve precise transmission and uniform distribution of different gases. For example, when introducing low-temperature methanol wash fuel gas and coal lock gas, the existing pipeline system cannot accommodate the different characteristics of these two gases (low-temperature methanol wash fuel gas has a flow rate of approximately 2500-4000 Nm³ / h, operating temperature of 24℃, operating pressure of 0.3 MPa, and a calorific value of approximately 1779 Kcal / Nm³; coal lock gas has a flow rate of approximately 1500-2000 Nm³ / h, operating temperature of ambient temperature, operating pressure of 15-20 KPa, and a calorific value of approximately 2492.7 Kcal / Nm³). ³), which stably and efficiently delivers fuel gas to the boiler combustion chamber, resulting in uneven distribution of the gas within the combustion chamber and affecting combustion efficiency. On the other hand, in the gas mixing stage, traditional devices lack an effective mixing structure. In the combustion chamber, fuel gas and coal lock gas cannot be mixed quickly and fully, failing to form a good combustible mixture, which in turn limits the combustion speed and intensity, resulting in low energy utilization efficiency of the boiler. Furthermore, traditional devices struggle to precisely control the pressure regulation during gas delivery, unable to adjust the delivery pressure of fuel gas and coal lock gas in a timely and accurate manner according to changes in the actual operating conditions of the boiler. This further affects the stable operation and energy utilization effect of the boiler.

[0004] Therefore, it is necessary to provide a new gas transmission device for boilers to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a gas transmission device for boilers.

[0006] The boiler gas delivery device provided by this utility model includes: a support frame, a return pipe, a gas delivery pipe assembly, and a rotating structure. The right combustion chamber is fixedly connected inside the support frame. A cyclone separator is fixedly connected to one side of the combustion chamber inside the support frame. The top of the combustion chamber is connected to the cyclone separator through a pipe. A return pipe is installed between the combustion chamber and the cyclone separator. One end of the return pipe is fixedly connected to the side wall of the combustion chamber, and the other end of the return pipe is fixedly connected to the bottom of the cyclone separator. An exhaust pipe is fixedly connected to the top of the cyclone separator. A gas delivery pipe assembly for delivering fuel gas and coal lock gas is installed at the bottom of the combustion chamber. A rotating structure for mixing fuel gas and coal lock gas is installed inside the combustion chamber.

[0007] Preferably, the gas delivery pipe assembly includes: a fuel gas delivery main pipe, a Y-shaped distributor, a fuel gas delivery branch pipe, a coal lock gas delivery main pipe, and a coal lock gas delivery branch pipe. A fuel gas delivery main pipe is provided on one side of the combustion chamber. A Y-shaped distributor is fixedly connected to one end of the fuel gas delivery main pipe near the combustion chamber. Fuel gas delivery branch pipes are fixedly connected to the other two holes of the Y-shaped distributor. The fuel gas delivery branch pipes extend into the combustion chamber from the diagonal and are fixedly connected to the combustion chamber. A coal lock gas delivery main pipe is provided on one side of the combustion chamber. A Y-shaped distributor is fixedly connected to one end of the coal lock gas delivery main pipe near the combustion chamber. Coal lock gas delivery branch pipes are fixedly connected to the other two holes of the Y-shaped distributor. Coal lock gas delivery branch pipes extend into the combustion chamber from the diagonal and are fixedly connected to the combustion chamber.

[0008] Preferably, the rotating structure includes: an outer ring, a gas groove, an inner ring, pushers, and an impeller. The inner wall of the combustion chamber is fixedly connected to the outer ring. The outer wall of the outer ring is connected to the two sets of fuel gas delivery pipes and coal gas delivery pipes. A gas groove for gas flow is opened inside the outer ring. The inner wall of the outer ring is rotatably connected to the inner ring. The outer wall of the inner ring is fixedly connected to multiple sets of pushers for pushing gas at equal intervals. The inner wall of the inner ring is fixedly connected to an impeller.

[0009] Preferably, both sets of fuel gas delivery pipes and coal lock gas delivery pipes are fixedly connected to a self-regulating pressure regulator.

[0010] Preferably, the impeller shaft has a conical design.

[0011] Preferably, multiple sets of air outlets are equidistantly provided on the inner ring side.

[0012] Preferably, an air inlet is provided at the bottom of the combustion chamber, and an air distribution plate is fixedly connected to the bottom of the combustion chamber above the air inlet.

[0013] Preferably, the surface of the air distribution plate has multiple sets of air holes at equal intervals, and each of the air holes is fixedly connected to an air cap.

[0014] Compared with related technologies, the boiler gas transmission device provided by this utility model has the following advantages:

[0015] Highly efficient and precise gas delivery:

[0016] Through the fuel gas delivery main pipe, the coal lock gas delivery main pipe, and the Y-shaped distributor connected to them, the fuel gas and coal lock gas are evenly distributed to their respective two delivery branches and extend into the combustion chamber from the diagonal. This achieves a decentralized input of gas in the combustion chamber, making the gas distribution more uniform. With the help of the self-regulating pressure regulator, the gas pressure in the fuel gas and coal lock gas delivery branches can be precisely adjusted according to the combustion requirements of the circulating fluidized bed boiler under different operating conditions. This ensures a stable and appropriate supply of gas, lays the foundation for stable and efficient combustion, avoids combustion fluctuations caused by unstable gas supply, and improves the stability and reliability of boiler operation.

[0017] Efficient and thorough gas mixing:

[0018] The rotating structure is ingeniously designed. Fuel gas and coal lock gas first flow into the outer ring, which is connected to the delivery pipe. The gas groove guides the orderly flow of gas. The inner ring rotates within the outer ring. The gas flow in the outer ring's gas groove pushes the pusher plate, causing the inner ring and impeller to rotate. At the same time, the rising gas in the combustion chamber also pushes the impeller to rotate. Under the dual action, the pusher plate and impeller exert force on the gas, promoting thorough mixing of fuel gas and coal lock gas. The conical design of the impeller shaft reduces rotational resistance, improves mixing efficiency, and prevents solid particles from accumulating on the top of the impeller shaft, ensuring stable impeller operation. Multiple sets of gas outlets on the side of the inner ring ensure that the mixed gas flows evenly into the combustion chamber, forming a uniform combustible mixture. This thorough mixing greatly improves the combustion speed and efficiency of the gas, allowing the fuel to fully contact and react rapidly with oxygen in the circulating fluidized bed. This reduces the generation of incomplete combustion products such as carbon monoxide, significantly improves energy utilization, and reduces fuel consumption and operating costs. Attached Figure Description

[0019] Figure 1 A schematic diagram of the structure of the boiler gas transmission device provided by this utility model;

[0020] Figure 2 for Figure 1 The diagram shows the structure of the combustion chamber;

[0021] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the combustion chamber.

[0022] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the outer ring.

[0023] The following are labeled in the diagram: 1. Support frame; 2. Combustion chamber; 3. Cyclone separator; 4. Return pipe; 5. Exhaust pipe; 6. Main fuel gas delivery pipe; 7. Y-shaped distributor; 8. Fuel gas delivery branch pipe; 9. Main coal lock gas delivery pipe; 10. Coal lock gas delivery branch pipe; 11. Outer ring; 12. Gas trough; 13. Inner ring; 14. Push plate; 15. Impeller; 16. Self-regulating pressure regulator; 17. Air distribution plate; 18. Air cap. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Please see Figures 1 to 4 A boiler gas delivery device includes: a support frame 1, a return pipe 4, a gas delivery pipe assembly, and a rotating structure. A right combustion chamber 2 is fixedly connected inside the support frame 1. A cyclone separator 3 is fixedly connected to one side of the combustion chamber 2 inside the support frame 1. The top of the combustion chamber 2 is connected to the cyclone separator 3 via a pipe. A return pipe 4 is installed between the combustion chamber 2 and the cyclone separator 3. One end of the return pipe 4 is fixedly connected to the side wall of the combustion chamber 2, and the other end is fixedly connected to the bottom of the cyclone separator 3. An exhaust pipe 5 is fixedly connected to the top of the cyclone separator 3. A gas delivery pipe assembly for delivering fuel gas and coal lock gas is installed at the bottom of the combustion chamber 2. A rotating structure for mixing fuel gas and coal lock gas is installed inside the combustion chamber 2. An air inlet is opened at the bottom of the combustion chamber 2. An air distribution plate 17 is fixedly connected above the air inlet at the bottom of the combustion chamber 2. Multiple sets of air holes are equidistantly opened on the surface of the air distribution plate 17, and air caps 18 are fixedly connected to the top of each of the multiple air holes.

[0027] It should be noted that the combination of the air distribution plate 17 and the air cap 18 can ensure uniform air distribution, provide fluidization power for the circulating fluidized bed, and at the same time provide sufficient oxygen for the complete combustion of the combustible mixture.

[0028] Please see Figure 2 and Figure 3The gas transmission pipeline assembly includes: a fuel gas transmission main pipe 6, a Y-shaped distributor 7, a fuel gas transmission branch pipe 8, a coal lock gas transmission main pipe 9, and a coal lock gas transmission branch pipe 10. A fuel gas transmission main pipe 6 is provided on one side of the combustion chamber 2. A Y-shaped distributor 7 is fixedly connected to one end of the fuel gas transmission main pipe 6 near the combustion chamber 2. The other two holes of the Y-shaped distributor 7 are fixedly connected to the fuel gas transmission branch pipe 8. The fuel gas transmission branch pipe 8 extends into the combustion chamber 2 from the diagonal and is fixedly connected to the combustion chamber 2. A coal lock gas transmission main pipe 9 is provided on one side of the combustion chamber 2. A Y-shaped distributor 7 is fixedly connected to one end of the coal lock gas transmission main pipe 9 near the combustion chamber 2. The other two holes of the Y-shaped distributor 7 are fixedly connected to the coal lock gas transmission branch pipe 10. The coal lock gas transmission branch pipe 10 extends into the combustion chamber 2 from the diagonal and is fixedly connected to the combustion chamber 2. A self-regulating pressure regulator 16 is fixedly connected to both sets of fuel gas transmission branch pipes 8 and coal lock gas transmission branch pipes 10.

[0029] It should be noted that the self-regulating pressure regulator 16 can precisely adjust the gas pressure in the fuel gas delivery pipe 8 and the coal lock gas delivery pipe 10 as needed.

[0030] Please see Figure 3 and Figure 4 The rotating structure includes an outer ring 11, a gas groove 12, an inner ring 13, a pusher plate 14, and an impeller 15. The inner wall of the combustion chamber 2 is fixedly connected to the outer ring 11. The outer wall of the outer ring 11 is connected to the two sets of fuel gas delivery pipes 8 and coal lock gas delivery pipes 10. The outer ring 11 has a gas groove 12 for gas flow. The inner wall of the outer ring 11 is rotatably connected to the inner ring 13. The outer wall of the inner ring 13 is fixedly connected to multiple sets of pusher plates 14 for pushing gas at equal intervals. The inner wall of the inner ring 13 is fixedly connected to the impeller 15. The shaft of the impeller 15 is designed as a cone. Multiple sets of air outlet holes are opened at equal intervals on the side of the inner ring 13.

[0031] It should be noted that the conical design at the shaft center of impeller 15 can reduce rotational resistance and also prevent solid particles from remaining on the top of the impeller 15 shaft, thus avoiding an increase in the overall weight of impeller 15.

[0032] The working principle of the boiler gas transmission device provided by this utility model is as follows:

[0033] Gas delivery:

[0034] Fuel gas and coal lock gas are transported to the vicinity of combustion chamber 2 through fuel gas main pipe 6 and coal lock gas main pipe 9, respectively. One end of fuel gas main pipe 6 is connected to a Y-shaped distributor 7, which evenly distributes the fuel gas to two fuel gas distribution pipes 8 extending from the diagonal of combustion chamber 2. Coal lock gas main pipe 9 also evenly distributes coal lock gas to two coal lock gas distribution pipes 10 extending from the diagonal of combustion chamber 2 through the Y-shaped distributor 7. During the transportation process, the self-regulating pressure regulator 16 precisely adjusts the gas pressure in fuel gas distribution pipes 8 and coal lock gas distribution pipes 10 as needed to ensure that the gas is stably and accurately delivered to combustion chamber 2.

[0035] Gas mixing:

[0036] After the fuel gas and coal lock gas enter the combustion chamber 2, they first flow into the outer ring 11, which is connected to two sets of delivery pipes. The outer ring 11 has a gas groove 12 inside to provide a channel for gas flow. The inner ring 13 rotates on the inner wall of the outer ring 11. Multiple sets of push plates 14 on the outer wall of the inner ring 13 push the inner ring 13 to rotate under the action of the gas flow inside the gas groove 12. At the same time, the impeller 15 fixed on the inner wall of the inner ring 13 will also rotate due to the thrust of the rising gas in the combustion chamber 2. Under the dual push of the gas in the gas groove 12 and the gas in the combustion chamber 2, the inner ring 13, push plates 14 and impeller 15 will rotate synchronously. The push plates 14 and impeller 15 will also generate force on the gas during the rotation, so that the fuel gas and coal lock gas are more fully mixed to form a uniform combustible mixture. The impeller 15 has a conical design at the shaft center to reduce rotational resistance and avoid solid particles from being retained and increasing the weight of the impeller 15. Multiple sets of gas outlet holes are equidistantly opened on the side of the inner ring 13 so that the gas flows into the combustion chamber 2 during the rotation.

[0037] Combustion and fluidization:

[0038] The air supply vent at the bottom of the combustion chamber 2 supplies air into the chamber through the air distribution plate 17. The air cap 18 on the air distribution plate 17 ensures that the air is evenly distributed, providing fluidization power for the circulating fluidized bed and making the bed material (such as coal particles, inert materials, etc.) fluidized. At the same time, sufficient oxygen also creates conditions for the complete combustion of the combustible mixture. The combustible mixture comes into full contact with the fluidized bed material and burns rapidly and completely in the fluidized state, releasing a large amount of heat.

[0039] Gas-solid separation and circulation:

[0040] The high-temperature flue gas generated by combustion carries solid particles and other impurities from the top of the combustion chamber 2 through a pipe into the cyclone separator 3. Inside the cyclone separator 3, the high-speed rotating airflow generates centrifugal force, throwing the solid particles against the cylinder wall, causing them to fall by gravity. The purified gas is discharged from the top exhaust pipe 5. The separated solid particles and some gas return to the combustion chamber 2 through the return pipe 4, realizing the circulation of bed material and gas, maintaining the material balance and combustion stability in the fluidized bed, and improving combustion efficiency and heat utilization.

[0041] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A gas transmission device for boilers, characterized in that, include: A support frame (1) is fixedly connected to a combustion chamber (2). A cyclone separator (3) is fixedly connected to one side of the combustion chamber (2) inside the support frame (1). The top of the combustion chamber (2) is connected to the cyclone separator (3) through a pipe. A return pipe (4) is installed between the combustion chamber (2) and the cyclone separator (3). One end of the return pipe (4) is fixedly connected to the side wall of the combustion chamber (2), and the other end of the return pipe (4) is fixedly connected to the bottom of the cyclone separator (3). An exhaust pipe (5) is fixedly connected to the top of the cyclone separator (3). Gas transmission pipeline assembly, the bottom of combustion chamber (2) is equipped with a gas transmission pipeline assembly for transporting fuel gas and coal lock gas; Rotary structure, the combustion chamber (2) is equipped with a rotary structure for mixing fuel gas and coal lock gas.

2. The boiler gas transmission device according to claim 1, characterized in that, The gas delivery pipeline assembly includes: a fuel gas delivery main pipe (6), a Y-shaped distributor (7), a fuel gas delivery branch pipe (8), a coal lock gas delivery main pipe (9), and a coal lock gas delivery branch pipe (10). The fuel gas delivery main pipe (6) is located on one side of the combustion chamber (2). The Y-shaped distributor (7) is fixedly connected to one end of the fuel gas delivery main pipe (6) near the combustion chamber (2). The other two holes of the Y-shaped distributor (7) are fixedly connected to the fuel gas delivery branch pipes (8). The fuel gas delivery branch pipes (8) supply gas from the combustion chamber (2) to the combustion chamber (2). The combustion chamber (2) extends into the combustion chamber (2) at its diagonal and is fixedly connected to the combustion chamber (2). A coal lock gas conveying main pipe (9) is provided on one side of the combustion chamber (2). A Y-shaped diverter (7) is fixedly connected to one end of the coal lock gas conveying main pipe (9) near the combustion chamber (2). The other two holes of the Y-shaped diverter (7) are fixedly connected to coal lock gas conveying branch pipes (10). The coal lock gas conveying branch pipes (10) extend into the combustion chamber (2) from its diagonal and are fixedly connected to the combustion chamber (2).

3. The boiler gas transmission device according to claim 2, characterized in that, The rotating structure includes an outer ring (11), a gas groove (12), an inner ring (13), a pusher plate (14), and an impeller (15). The inner wall of the combustion chamber (2) is fixedly connected to the outer ring (11). The outer wall of the outer ring (11) is connected to the two sets of fuel gas delivery pipes (8) and coal lock gas delivery pipes (10). The outer ring (11) has a gas groove (12) for gas flow inside. The inner wall of the outer ring (11) is rotatably connected to the inner ring (13). The outer wall of the inner ring (13) is fixedly connected to multiple sets of pusher plates (14) for pushing gas at equal intervals. The inner wall of the inner ring (13) is fixedly connected to the impeller (15).

4. The boiler gas transmission device according to claim 2, characterized in that, Both sets of fuel gas delivery pipes (8) and coal lock gas delivery pipes (10) are fixedly connected to self-regulating pressure regulators (16).

5. The boiler gas transmission device according to claim 3, characterized in that, The impeller (15) has a conical design at its shaft center.

6. The boiler gas transmission device according to claim 3, characterized in that, Multiple sets of air outlets are equidistantly opened on the side of the inner ring (13).

7. The boiler gas transmission device according to claim 1, characterized in that, An air inlet is provided at the bottom of the combustion chamber (2), and an air distribution plate (17) is fixedly connected above the air inlet at the bottom of the combustion chamber (2).

8. The boiler gas transmission device according to claim 7, characterized in that, Multiple sets of air holes are equidistantly opened on the surface of the air distribution plate (17), and air caps (18) are fixedly connected to the top of each of the multiple air holes.

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