Air control system of fluidized bed roaster

Abstract

The utility model belongs to the technical field of fluidized bed roamers, and particularly relates to a fluidized bed roaster air control system which comprises a roaster body and an air supply mechanism, the roaster body comprises a hearth and a feeding section which are vertically communicated, and a roaster gas outlet and a smoke outlet are formed in the top of the roaster body; the air supply mechanism comprises an air bellow, an air compressor, an air storage tank, a pulse control valve, a first ventilation pipe, an air blower, a one-way valve and a second ventilation pipe, the air bellow is connected to the bottom of the furnace body, an air distribution plate is arranged at the joint of the air bellow and the furnace body, and a first air inlet and a second air inlet are formed in the air bellow; a first air inlet of the air bellow is sequentially connected with a pulse control valve, an air storage tank and an air compressor through a first ventilation pipe, and a second air inlet of the air bellow is sequentially connected with a one-way valve and an air blower through a second ventilation pipe. According to the device, by adding the auxiliary gas path, gas is blown into the air bellow regularly and quantitatively, so that the air pressure in the air bellow is increased within an extremely short time, the air cap hole is physically cleaned, and the smoothness of the air path is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluidized bed roaster, and particularly relates to a risk control system for a fluidized bed roaster. Background Art

[0002] A fluidized bed roaster is a thermal equipment using the technology of dispersed flow fluidized bed. When a fluid flows upward through a static granular material layer, if the flow rate exceeds a certain limit, the bulk material layer begins to expand and creep, becoming fluidized and turning into a pseudo-fluid state. This process is called fluidization of the bulk material layer. After fluidization, the granular material tumbles up and down, similar to the boiling of the fluid, so it is also called a fluidized bed. The thermal equipment using this method to process materials is called a fluidized bed furnace.

[0003] However, in actual production, especially for large and medium-sized fluidized bed roasters, side-flow direct-blowing tuyeres are mostly used. The wind pressure inside the wind box fluctuates due to many factors, and the wind pressure of the tuyeres at the edge of the air distribution plate is relatively lower. Therefore, the final result is that a large amount of materials in the furnace will be sucked into the wind box through the tuyere holes along with the fluctuating wind pressure, causing serious slag accumulation in the wind box. At the same time, a part of the materials will first be sucked into the tuyere, and then, under the action of the fluctuating wind pressure, be blown back into the furnace, but cannot accurately blow into the furnace through the tuyere holes and remain in the tuyere. Over time, the tuyere holes will be blocked and sintered, ultimately resulting in uneven air distribution and difficult air distribution. If the maintenance is not timely, it may even cause safety accidents.

[0004] Therefore, there is an urgent need for a risk control system for a fluidized bed roaster to solve the above problems. Summary of the Utility Model

[0005] In view of the above defects existing in the prior art, the utility model provides a risk control system for a fluidized bed roaster, which includes a furnace body and an air supply mechanism. The furnace body includes a furnace chamber and a feeding section that are connected up and down. The top of the furnace body is provided with a furnace gas outlet and a smoke exhaust port.

[0006] The air supply mechanism includes a wind box, an air compressor, a gas storage tank, a pulse control valve, a first ventilation pipe, a blower, a check valve, and a second ventilation pipe. The wind box is connected to the bottom of the furnace body, and an air distribution plate is provided at the connection between the wind box and the furnace body. The wind box is provided with a first air inlet and a second air inlet. The first air inlet of the wind box is connected to the air compressor through the pulse control valve and the gas storage tank in sequence via the first ventilation pipe, and the second air inlet of the wind box is connected to the blower through the check valve via the second ventilation pipe.

[0007] Optionally, a fixed support is fixed below the furnace body. A first electromagnetic heating coil and a second electromagnetic heating coil are respectively provided on the outer side walls of the furnace chamber and the wind box of the furnace body. A feeding port is provided on one side of the feeding section of the furnace body, and a quantitative feeding device is connected at the feeding port. An inclined overflow discharge pipe is connected to the other side of the feeding section of the furnace body.

[0008] Specifically, the electromagnetic heating method is adopted, which is more energy-saving and environmentally friendly; at the same time, secondary heating is carried out in the furnace chamber to extend the reaction time of the material.

[0009] Optionally, the metering feeding device is a screw feeder.

[0010] Optionally, a heat insulation layer is arranged outside the furnace body.

[0011] Specifically, the heat insulation layer is made of high-temperature ceramic fiber, and has good heat insulation effect.

[0012] Optionally, a safety valve is arranged at the furnace gas outlet of the furnace body.

[0013] Optionally, a plurality of air caps are arranged on the air distribution plate of the air box.

[0014] The present utility model further includes other components that can make a fluidized bed roasting furnace air control system work properly, which are all conventional technical means in the art. In addition, the devices or components not defined in the present utility model all adopt conventional technical means in the art, such as air compressors, pulse control valves, blowers, one-way valves, electromagnetic heating coils, and screw feeders.

[0015] The working principle of the present utility model is that the blower passes air into the air box through the second ventilation pipe, the second electromagnetic heating coil arranged on the side wall of the air box heats the air in the air box, and at the same time, the screw feeder is used to quantitatively add materials into the feeding section. The materials are heated once by the hot air from the air box and then enter the furnace chamber from bottom to top, and then are heated twice by the first electromagnetic heating coil; for the air cap holes that may be blocked, an air compressor, an air storage tank, and a pulse control valve can be used as the auxiliary air path of the air box to blow gas into the air box regularly and quantitatively, so that the air pressure inside the air box rises in a very short time, thereby physically cleaning the air cap holes that are about to be blocked or have been blocked, and ensuring the smoothness of the air path.

[0016] The beneficial effect of the present utility model is that through the air supply mechanism, an air compressor, an air storage tank, and a pulse control valve are added as the auxiliary air path of the air box. Through automatic control, gas is blown into the air box regularly and quantitatively, so that the air pressure inside the air box rises in a very short time, thereby physically cleaning the air cap holes that are about to be blocked or have been blocked, and ensuring the smoothness of the air path. Description of the Drawings

[0017] The present utility model will be further described below with reference to the drawings and embodiments.

[0018] Figure 1 is a schematic diagram of the overall structure of the present utility model.

[0019] Figure 2 is Figure 1 an enlarged schematic diagram of the structure of part A in

[0020] In the figure: 1. furnace body, 2. furnace chamber, 3. feeding section, 4. furnace gas outlet, 5. smoke exhaust port, 6. safety valve, 7. air box, 8. air compressor, 9. gas storage tank, 10. pulse control valve, 11. first ventilation pipe, 12. blower, 13. check valve, 14. second ventilation pipe, 15. air distribution plate, 16. air cap, 17. fixed support, 18. first electromagnetic heating coil, 19. second electromagnetic heating coil, 20. screw feeder, 21. overflow discharge pipe. Specific embodiments

[0021] The present invention will be clearly described below in conjunction with the drawings in the embodiments of the present invention and specific embodiments. The description here is only used to explain the present invention, but not to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

[0022] Embodiment

[0023] As Figure 1-2 shown, an embodiment of the present invention provides a risk control system for a fluidized bed roasting furnace, including a furnace body 1 and an air supply mechanism. The furnace body 1 includes a furnace chamber 2 and a feeding section 3 that communicate with each other up and down. A furnace gas outlet 4 and a smoke exhaust port 5 are provided at the top of the furnace body 1, and a safety valve 6 is provided at the furnace gas outlet 4.

[0024] The air supply mechanism includes an air box 7, an air compressor 8, a gas storage tank 9, a pulse control valve 10, a first ventilation pipe 11, a blower 12, a check valve 13 and a second ventilation pipe 14. The air box 7 is connected to the bottom of the furnace body 1, and an air distribution plate 15 is provided at the connection between the air box 7 and the furnace body 1. A plurality of air caps 16 are provided on the air distribution plate 15. A first air inlet and a second air inlet are provided on the air box 7. The first air inlet of the air box 7 is connected to the pulse control valve 10, the gas storage tank 9 and the air compressor 8 in sequence through the first ventilation pipe 11, and the second air inlet of the air box 7 is connected to the check valve 13 and the blower 12 in sequence through the second ventilation pipe 14.

[0025] In addition, a fixed support 17 is fixed below the furnace body 1. A first electromagnetic heating coil 18 and a second electromagnetic heating coil 19 are respectively provided on the outer side walls of the furnace chamber 2 of the furnace body 1 and the air box 7. The electromagnetic heating method is adopted, which is more energy-saving and environmentally friendly. At the same time, secondary heating is carried out in the furnace chamber 2 to extend the material reaction time. A feeding port is provided on one side of the feeding section 3 of the furnace body 1, and a screw feeder 20 is connected to the feeding port. An inclined overflow discharge pipe 21 is connected to the other side of the feeding section 3 of the furnace body 1. A heat insulation layer is provided outside the furnace body 1, and the heat insulation layer is made of high-temperature ceramic fiber with good heat insulation effect.

[0026] The working principle of the present utility model is as follows: The blower 12 passes air into the air box 7 through the second ventilation pipe 14. The second electromagnetic heating coil 19 provided on the side wall of the air box 7 heats the air in the air box 7. Meanwhile, the screw feeder 20 is used to quantitatively add materials into the feeding section 3. After being heated once by the hot air from the air box 7, the materials enter the furnace 2 from bottom to top and are then heated twice by the first electromagnetic heating coil 18. For the tuyere holes that may be blocked, the air compressor 8, the air storage tank 9 and the pulse control valve 10 can be used as the auxiliary air path of the air box 7 to blow gas into the air box 7 regularly and quantitatively, so that the air pressure inside the air box 7 rises within a very short time, thereby physically cleaning the tuyere holes that are about to be blocked or have already been blocked to ensure the smoothness of the air path.

[0027] The embodiments of the present utility model have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments.

Claims

1. A risk control system for a fluidized bed roaster, comprising a furnace body and an air supply mechanism, characterized in that: The furnace body includes a furnace chamber and a feeding section that are connected vertically. A furnace gas outlet and a smoke exhaust port are provided at the top of the furnace body. The air supply mechanism includes an air box, an air compressor, a gas storage tank, a pulse control valve, a first ventilation pipe, a blower, a check valve, and a second ventilation pipe. The air box is connected to the bottom of the furnace body, and an air distribution plate is provided at the connection between the air box and the furnace body. A first air inlet and a second air inlet are provided on the air box. The first air inlet of the air box is connected to the pulse control valve, the gas storage tank, and the air compressor in sequence through the first ventilation pipe. The second air inlet of the air box is connected to the check valve and the blower in sequence through the second ventilation pipe.

2. The air control system of the fluidized bed roaster according to claim 1, wherein: A fixed support is fixed below the furnace body. A first electromagnetic heating coil and a second electromagnetic heating coil are respectively provided on the outer side walls of the furnace chamber of the furnace body and the air box. A feeding port is provided on one side of the feeding section of the furnace body, and a quantitative feeding device is connected at the feeding port. An inclined overflow discharge pipe is connected to the other side of the feeding section of the furnace body.

3. The air control system of the fluidized bed roaster according to claim 2, wherein: The quantitative feeding device is a screw feeder.

4. The air control system of the fluidized bed roaster according to claim 3, wherein: A heat insulation layer is provided outside the furnace body.

5. The air control system of the fluidized bed roaster according to claim 4, characterized in that: A safety valve is provided at the furnace gas outlet of the furnace body.

6. The air control system of the fluidized bed roaster according to claim 5, characterized in that: A plurality of air caps are provided on the air distribution plate of the air box.

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