Horizontal feeding system of fluidized bed boiler

Abstract

The utility model relates to the field of feeding of fluidized bed boilers, in particular to a horizontal feeding system of a fluidized bed boiler, which comprises a blanking hopper, a first-stage screw feeder, a second-stage screw feeder, a first-stage screw feeder, a first-stage screw feeder, a second-stage screw feeder, a second-stage screw feeder, a second-stage screw feeder and a third-stage screw feeder, the hearth is used for burning special fuel, and a secondary screw feeder is mounted on the outer side of the hearth; when the horizontal feeding system of the fluidized bed boiler runs, special fuel is fed through the blanking hopper, conveyed to the blanking pipe through the operation of the first-stage screw feeder, descended to the bottom of the blanking pipe under the action of gravity and accumulated at the bottom of the blanking pipe, and the special fuel is conveyed to the blanking pipe through the first-stage screw feeder. Therefore, sealing of the blanking pipe is achieved, the purpose of sealing the boiler is achieved, the problem of smoke return is completely eradicated, and the problem of air leakage of the feeding port of the circulating fluidized bed boiler is solved.

Description

Technical Field

[0001] The utility model relates to the field of fluidized bed boiler feeding, in particular to a fluidized bed boiler horizontal feeding system. Background Art

[0002] The circulating fluidized bed boiler is a type of boiler that has been developed for more than 30 years. It has the characteristics of wide fuel adaptability, high combustion efficiency and low pollutant emission rate. It was mainly used for coal burning at the beginning. Because it can be applied to various types of coal, especially low calorific value coal and has the advantages of low pollutant emission, it has been widely used soon. The feeding system of all coal-burning circulating fluidized bed boilers is that the coal enters the feeder (quantitative) from the coal hopper, which is generally a screw feeder and a belt feeder, and then enters the furnace for combustion through the feeder to a vertical drop pipe and a 45° inclined drop pipe.

[0003] Later, with the continuous emergence of the demand for burning various new fuels, various new fluidized bed boilers for combustion (not limited to coal) also continued to appear, such as: circulating fluidized bed boilers that burn urban domestic waste, circulating fluidized bed boilers that use biomass as fuel. The feeding device of the new boiler still uses the feeding form of the circulating fluidized bed boiler that burns coal: feeding device, conveying device, and dropping device. Since the boiler is not well sealed during the feeding process, the boiler has problems such as unstable feeding, air leakage at the feeding port, and smoke return at the feeding port during operation, affecting the safe and stable operation of the boiler. Therefore, this feeding method cannot adapt to this new type of fuel. At the same time, in order to reduce the occurrence of the above two situations, some wind that is useless for boiler combustion should be supplemented from the feeding port to the furnace, but this also leads to excessive boiler flue gas and increased air coefficient, which reduces boiler efficiency.

[0004] Therefore, it is necessary to provide a new fluidized bed boiler horizontal feeding system to solve the above technical problems. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a horizontal feeding system for a fluidized bed boiler.

[0006] The horizontal feeding system of the fluidized bed boiler provided by the utility model comprises:

[0007] A drop hopper, which is used to feed special fuels, and a first-stage screw feeder is installed at the discharge port of the drop hopper;

[0008] The furnace is used for burning special fuels, and a two-stage screw feeder is installed on the outside of the furnace;

[0009] The drop pipe is installed between the discharge port of the first-stage screw feeder and the feed port of the second-stage screw feeder. The inside of the drop pipe is filled with special fuel. The drop hopper, the first-stage screw feeder and the second-stage screw feeder are all set higher than the furnace. When the device is in use, the special fuel is fed through the drop hopper, and the special fuel is transported to the drop pipe through the operation of the first-stage screw feeder. The special fuel falls to the bottom of the drop pipe under the action of gravity. The special fuel will accumulate at the bottom of the drop pipe, thereby achieving the purpose of sealing the drop pipe, and then achieving the purpose of sealing the boiler, eliminating the problem of smoke return, and the special fuel at the bottom of the drop pipe is transported to the second-stage screw feeder, and then the special fuel is transported to the furnace.

[0010] Preferably, a rotating rod is symmetrically rotatably installed inside the blanking tube through a bearing, a crushing roller is fixedly installed in the middle of the rotating rod, a driving gear and a driven gear are respectively fixedly installed at the ends of the two rotating rods, the driving gear is meshingly connected with the driven gear, and a control motor is fixedly installed on the outside of the blanking tube at a position corresponding to the end of one of the rotating rods, the output end of the control motor is fixedly connected to the end of the rotating rod, and the control motor is a reduction motor.

[0011] Preferably, a conical ring for conveying the special fuel to between the two crushing rollers is fixedly installed inside the top end of the drop pipe, so that all the special fuel can be conveyed to between the two crushing rollers for crushing.

[0012] Preferably, the surface friction of the conical ring is small, so as to prevent the accumulation of special fuel on the surface of the conical ring.

[0013] Preferably, a vibration motor is fixedly installed on the outer side of the drop tube. The operation of the vibration motor drives the density of the special fuel accumulated at the bottom of the drop tube to increase, and at the same time, the special fuel at the bottom of the drop tube can be stably transported to the secondary screw feeder under the action of vibration.

[0014] Preferably, a blowing pipe is installed on the outer side of the furnace corresponding to the lower position of the secondary screw feeder. The blowing of the blowing pipe introduces primary air into the furnace to disperse the fuel inside the furnace.

[0015] Compared with the prior art, the horizontal feeding system for fluidized bed boiler provided by the utility model has the following beneficial effects:

[0016] The utility model provides a fluidized bed boiler horizontal feeding system. When the system is in operation, special fuel is fed through a feeding hopper, and the special fuel is transported to a feeding pipe through the operation of a first-stage screw feeder. The special fuel falls to the bottom of the feeding pipe under the action of gravity, and the special fuel is accumulated at the bottom of the feeding pipe, thereby closing the feeding pipe, and further sealing the boiler, eliminating the problem of smoke return, and solving the problem of air leakage at the feeding port of the circulating fluidized bed boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the horizontal feeding system of a fluidized bed boiler provided by the utility model;

[0018] Figure 2 for Figure 1 The local structure schematic diagram shown;

[0019] Figure 3 for Figure 1 The schematic diagram of the partial cross-section structure is shown.

[0020] Numbers in the figure: 1. Drop hopper; 2. First-stage screw feeder; 3. Furnace; 4. Second-stage screw feeder; 5. Drop pipe; 6. Rotating rod; 7. Crushing roller; 8. Driving gear; 9. Driven gear; 10. Control motor; 11. Conical ring; 12. Vibration motor; 13. Blowing pipe. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] The specific implementation of the present utility model is described in detail below in conjunction with specific embodiments.

[0023] See also Figures 1 to 3 The embodiment of the utility model provides a fluidized bed boiler horizontal feeding system, the fluidized bed boiler horizontal feeding system comprising:

[0024] A drop hopper 1, which is used to feed special fuels, and a first-stage screw feeder 2 is installed at the discharge port of the drop hopper 1;

[0025] A furnace 3, which is used for burning special fuels. A two-stage screw feeder 4 is installed outside the furnace 3;

[0026] The drop pipe 5 is installed between the discharge port of the primary screw feeder 2 and the feed port of the secondary screw feeder 4. The inside of the drop pipe 5 is filled with special fuel. The drop hopper 1, the primary screw feeder 2 and the secondary screw feeder 4 are all arranged higher than the furnace 3. When the device is in use, the special fuel is fed through the drop hopper 1, and the special fuel is transported to the drop pipe 5 through the operation of the primary screw feeder 2. The special fuel falls to the bottom of the drop pipe 5 under the action of gravity, and the special fuel will accumulate at the bottom of the drop pipe 5, thereby achieving the purpose of sealing the drop pipe 5, and then achieving the purpose of sealing the boiler, eliminating the problem of smoke return, and the special fuel at the bottom of the drop pipe 5 is transported to the secondary screw feeder 4, and then the special fuel is transported to the furnace 3.

[0027] See also Figures 1 to 3 A rotating rod 6 is symmetrically rotatably installed inside the blanking tube 5 through a bearing, a crushing roller 7 is fixedly installed in the middle of the rotating rod 6, a driving gear 8 and a driven gear 9 are fixedly installed at the ends of the two rotating rods 6, and the driving gear 8 is meshed with the driven gear 9. A control motor 10 is fixedly installed at the end position of one of the rotating rods 6 on the outside of the blanking tube 5, and the output end of the control motor 10 is fixedly connected to the end of the rotating rod 6. The control motor 10 is a reduction motor.

[0028] See also Figures 1 to 3 A conical ring 11 for conveying the special fuel between the two crushing rollers 7 is fixedly installed inside the top end of the drop pipe 5. All the special fuel can be conveyed between the two crushing rollers 7 for crushing.

[0029] See also Figures 1 to 3 The surface friction of the conical ring 11 is small, which prevents the accumulation of special fuel on the surface of the conical ring 11.

[0030] See also Figures 1 to 3 A vibration motor 12 is fixedly installed on the outer side of the drop tube 5. The operation of the vibration motor 12 will increase the density of the special fuel accumulated at the bottom of the drop tube 5. At the same time, the special fuel at the bottom of the drop tube 5 can be stably transported to the secondary screw feeder 4 under the action of vibration.

[0031] See also Figures 1 to 3 A blowing pipe 13 is installed on the outer side of the furnace 3 corresponding to the lower position of the secondary screw feeder 4. The blowing of the blowing pipe 13 introduces primary air into the furnace 3 to disperse the fuel inside the furnace 3.

[0032] When the device is in use, the special fuel is fed through the drop hopper 1, and the special fuel is transported to the drop pipe 5 through the operation of the first-stage screw feeder 2. The special fuel drops to the bottom of the drop pipe 5 under the action of gravity. In this process, the material is transported between the two crushing rollers 7 through the provided conical ring 11, and the rotating rod 6 is driven to rotate under the operation of the control motor 10. The two crushing rollers 7 are driven to rotate through the engagement of the driving gear 8 and the driven gear 9. The special fuel will be crushed and extruded between the two crushing rollers 7 to crush larger materials. The special fuel will accumulate at the bottom of the drop pipe 5, thereby achieving the closure of the drop pipe 5, and then achieving the purpose of sealing the boiler, eliminating the problem of smoke return, and at the same time, the density of the special fuel accumulated at the bottom of the drop pipe 5 will be increased through the operation of the vibration motor 12. At the same time, the special fuel at the bottom of the drop pipe 5 can be stably transported to the second-stage screw feeder 4 under the action of vibration, and then the special fuel is transported to the furnace 3.

[0033] The circuits and controls involved in the present invention are all prior art and will not be described in detail here.

[0034] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A horizontal feeding system for a fluidized bed boiler, characterized in that: include: A drop hopper (1), the drop hopper (1) is used to feed special fuel, and a first-stage screw feeder (2) is installed at the discharge port of the drop hopper (1); A furnace (3), the furnace (3) is used for burning special fuel, and a secondary screw feeder (4) is installed outside the furnace (3); A material drop pipe (5) is installed between the discharge port of the first-stage screw feeder (2) and the feed port of the second-stage screw feeder (4), and the interior of the material drop pipe (5) is filled with a special fuel.

2. The horizontal feeding system of the fluidized bed boiler according to claim 1, characterized in that: The drop hopper (1), the first-stage screw feeder (2) and the second-stage screw feeder (4) are all arranged higher than the furnace (3).

3. The horizontal feeding system of a fluidized bed boiler according to claim 1, characterized in that: A rotating rod (6) is symmetrically rotatably mounted inside the drop tube (5) via a bearing, a crushing roller (7) is fixedly mounted in the middle of the rotating rod (6), a driving gear (8) and a driven gear (9) are respectively fixedly mounted at the ends of the two rotating rods (6), the driving gear (8) and the driven gear (9) are meshingly connected, and a control motor (10) is fixedly mounted on the outer side of the drop tube (5) at a position corresponding to the end of one of the rotating rods (6), and the output end of the control motor (10) is fixedly connected to the end of the rotating rod (6).

4. The horizontal feeding system of the fluidized bed boiler according to claim 3, characterized in that: The control motor (10) is a reduction motor.

5. The horizontal feeding system of the fluidized bed boiler according to claim 3, characterized in that: A conical ring (11) is fixedly installed inside the top end of the drop tube (5) and is used to transport the special fuel to between the two crushing rollers (7).

6. The horizontal feeding system for fluidized bed boiler according to claim 5, characterized in that: The surface friction of the conical ring (11) is small.

7. The horizontal feeding system for a fluidized bed boiler according to claim 5, characterized in that: A vibration motor (12) is fixedly mounted on the outer side of the drop tube (5).

8. The horizontal feeding system for a fluidized bed boiler according to claim 1, characterized in that: A blowing pipe (13) is installed on the outer side of the furnace (3) at a position below the secondary screw feeder (4).

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