Microwave calcining device for desulfurized gypsum

Abstract

The utility model discloses a desulfurized gypsum microwave calcining device, relates to the technical field of industrial solid waste desulfurized gypsum treatment, and solves the problems that a microwave calcining device in the prior art is inconvenient to exhaust waste gas and low in feeding and discharging efficiency. The microwave oven comprises a rack, a microwave bin is arranged on the rack, a feeding assembly and a discharging assembly are arranged on the side wall of the microwave bin, a microwave emitter is arranged at the top of the microwave bin, a stirring mechanism is rotationally arranged at the bottom of the microwave bin, the microwave bin is communicated with an exhaust channel, and the stirring mechanism is matched with the discharging assembly. And the stirring mechanism is arranged, so that the desulfurized gypsum can be stirred in the heating and calcining process, and heating is more uniform. The feeding assembly and the discharging assembly are arranged on the side wall of the microwave bin body, the overall structure is reasonably arranged, the feeding angle is more convenient, stirring and conveying are conducted through cooperation of a stirring mechanism during discharging, and the feeding and discharging efficiency is improved; the exhaust channel is arranged, waste gas is exhausted while the microwave bin body is closed during calcination, and pollution caused by waste gas leakage is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial solid waste desulfurized gypsum treatment, in particular to a desulfurized gypsum microwave calcining device. Background Art

[0002] Desulfurized gypsum is also called flue gas desulfurized gypsum, sulfur gypsum or FGD gypsum. Its main component is more than 90% calcium sulfate dihydrate and 15-20% water content, just like natural gypsum. Desulfurized gypsum is a byproduct of the FGD process. After dust removal, the flue gas containing SO2 is passed through a limestone slurry scrubber to remove SO2. Using desulfurized gypsum to prepare building materials can realize its resource utilization to a great extent, promote the further development of the national environmental protection circular economy, and greatly reduce the amount of ore gypsum used for mining and protect resources. In recent years, with the rapid development of coal-fired power generation industry, the emission of desulfurized gypsum has increased year by year, but the comprehensive utilization rate is only about 30%. Therefore, the clean and effective utilization of desulfurized gypsum has always been an environmental problem associated with the healthy development of coal-fired power plants and coal-fired enterprises. The existing treatment method for desulfurized gypsum is mainly to convert the original desulfurized gypsum into semi-hydrated gypsum through high-temperature calcination and de-crystallization water, which is used to solidify the fly ash from garbage incineration. However, the traditional high-temperature calcination method has the disadvantages of high energy consumption and environmental protection.

[0003] The Chinese utility model patent with publication number CN202973833U discloses a continuous high-temperature industrial microwave calcining furnace for small mineral particles and powders, including: a cavity, a magnetron connected to the inner wall of the cavity, an inner tank, a heating element, a feed port, and a discharge port, characterized in that: a heating device is provided inside the cavity, the heating device is funnel-shaped, the heating device is connected to the inner tank and is located in the electromagnetic wave uniform field area in the cavity, there is a gap between the two adjacent layers of heating devices and they are in a positive and negative buckle shape, and the outer diameter of the upper layer of the heating device is smaller than the outer diameter of the lower layer of the heating device. However, during the overshoot of the calcination treatment of desulfurized gypsum, the generated gas needs to enter the exhaust gas purification system for purification before it can be discharged, and the equipment cannot achieve sealing during the calcination process and cannot export the exhaust gas. At the same time, the microwave calcining furnace relies on the feed port set at the top and the discharge port set obliquely at the bottom for feeding and discharging. However, when used in the desulfurized gypsum calcination scenario, it is easy to cause slow feeding speed and accumulation at the discharge port during discharging, resulting in low feeding and discharging efficiency. Utility Model Content

[0004] In view of the deficiencies in the above-mentioned background technology, the utility model proposes a microwave calcining device for desulfurized gypsum, which solves the problems of inconvenient exhaust gas discharge and low material input and output efficiency of the microwave calcining device in the prior art.

[0005] The technical solution of the utility model is implemented as follows: a microwave calcining device for desulfurized gypsum comprises a frame, a microwave bin body is arranged on the frame, a feeding assembly and a discharging assembly are arranged on the side wall of the microwave bin body, a microwave emitter is arranged on the top of the microwave bin body, a stirring mechanism is arranged at the bottom for rotation, the microwave bin body is connected to an exhaust channel, and the stirring mechanism is arranged in coordination with the discharging assembly.

[0006] Preferably, the microwave chamber body is a spindle-shaped rotating chamber body, and a heat-insulating layer is provided outside the microwave chamber body.

[0007] Preferably, the rack includes legs fixed to the side walls of the microwave chamber body, and a fixed foot plate is provided at the bottom of the legs.

[0008] Preferably, the feed assembly includes a feed opening opened on the upper part of the side wall of the microwave bin body, a feed cover plate for covering the feed opening is slidably provided on the feed opening, and a first pneumatic push rod for controlling the sliding of the feed cover plate is provided between the feed cover plate and the microwave bin body.

[0009] Preferably, the discharge assembly includes a discharge opening opened at the lower part of the side wall of the microwave bin body, a discharge cover is hinged at the upper edge of the discharge opening, and a second pneumatic push rod for controlling the discharge cover to cover the discharge opening is provided between the discharge cover and the microwave bin body.

[0010] Preferably, a sealing rubber ring is provided between the feed opening and the feed cover plate, and between the discharge opening and the discharge cover plate; and a material guide trough is connected to the lower edge of the discharge opening and the lower edge of the feed opening.

[0011] Preferably, the stirring mechanism includes a driving motor fixedly arranged at the bottom of the microwave chamber body, the output end of the driving motor enters the microwave chamber body and is provided with a conical block at the end, and the conical block is provided with blades; the conical block is higher than the lower edge of the discharge opening.

[0012] Preferably, the exhaust passage comprises an exhaust pipe connected to the microwave chamber body, the exhaust pipe is provided with an electromagnetic valve, an exhaust fan, and a metal filter is provided at the connection between the exhaust pipe and the microwave chamber body.

[0013] The beneficial effects of the utility model are as follows: by providing a microwave bin and a microwave transmitter, the purpose of emitting microwaves to heat and calcine the desulfurized gypsum entering the microwave bin can be achieved. By providing a stirring mechanism, the desulfurized gypsum entering the microwave bin can be stirred during the heating and calcining process to make the heating more uniform. By providing a feeding assembly and a discharging assembly on the side wall of the microwave bin, a reasonable layout of the overall structure is achieved, the feeding angle is more convenient, and the stirring mechanism is used to cooperate with the discharging for stirring and conveying, thereby accelerating the feeding and discharging efficiency; an exhaust channel is provided to discharge the exhaust gas in the microwave bin in a closed state during calcination to avoid pollution caused by exhaust gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the discharging assembly and the stirring mechanism of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the feed assembly and the exhaust channel of the utility model.

[0018] In the figure: 1: frame, 2: microwave chamber, 3: feeding assembly, 4: discharging assembly, 5: microwave emitter, 6: stirring mechanism, 7: exhaust channel, 8: legs, 9: fixed foot plate, 10: feeding opening, 11: feeding cover plate, 12: first pneumatic push rod, 13: discharging opening, 14: discharging cover plate, 15: second pneumatic push rod, 16: guide trough, 17: driving motor, 18: conical block, 19: blades, 20: exhaust pipe, 21: electromagnetic valve, 22: exhaust fan, 23: metal filter. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] like Figure 1As shown, in Example 1, a microwave calcining device for desulfurized gypsum comprises a frame 1, on which a microwave chamber 2 is arranged. Specifically, in this embodiment, the microwave chamber 2 is a spindle-shaped rotating chamber, and an insulation layer is arranged outside the microwave chamber 2. The insulation layer can insulate the microwave chamber, reduce heat loss during calcination, and save energy. In addition, the frame 1 comprises a leg 8 fixed to the side wall of the microwave chamber 2, and a fixed foot plate 9 is arranged at the bottom of the leg 8. The fixed foot plate 9 can be fixed to the ground through anchor bolts to form a stable supporting connection foundation. A feeding assembly 3 and a discharging assembly 4 are arranged on the side wall of the microwave chamber 2, and a microwave emitter 5 is arranged on the top of the microwave chamber 2, and a stirring mechanism 6 is arranged at the bottom for rotation. The microwave emitter can emit microwaves to heat and calcine the desulfurized gypsum entering the microwave chamber. The stirring mechanism can stir the desulfurized gypsum entering the microwave chamber during the heating and calcination process, so that the desulfurized gypsum is heated more evenly. The microwave chamber 2 is connected to the exhaust channel 7, which can discharge the exhaust gas in the microwave chamber in a closed state during calcination to avoid pollution caused by exhaust gas leakage. The stirring mechanism 6 is arranged in conjunction with the discharge assembly 4. During the calcination stage, the stirring mechanism can stir the desulfurized gypsum in the microwave chamber to make it heated more evenly. During the discharge stage after the calcination is completed, the stirring mechanism can quickly discharge the desulfurized gypsum from the microwave chamber through the discharge assembly.

[0021] In this embodiment, the feeding assembly and the discharging assembly are both arranged on the side wall of the microwave bin body, the feeding assembly is located at the upper end of the side wall, and the discharging assembly is located at the lower end of the side wall, and both are arranged on the inclined surface of the spindle-shaped microwave bin body, so that the feeding and discharging are carried out in an inclined manner, the feeding angle is more convenient, and a reasonable layout of the overall structure is achieved. When discharging the material, the stirring mechanism is used to cooperate with the stirring and conveying to speed up the feeding and discharging efficiency.

[0022] Embodiment 2, a microwave calcination device for desulfurized gypsum, such as Figure 2 , 3As shown, on the basis of Example 1, the feed assembly 3 includes a feed opening 10 opened on the upper part of the side wall of the microwave bin body 2, and a feed cover plate 11 for covering the feed opening 10 is slidably provided on the feed opening 10, and a first pneumatic push rod 12 for controlling the sliding of the feed cover plate 11 is provided between the feed cover plate 11 and the microwave bin body 2. A material guide groove 16 is connected to the lower edge of the feed opening 10. A sealing rubber ring is provided between the feed opening 10 and the feed cover plate 11, and the sealing rubber ring can improve the sealing performance in the covered state and avoid gas leakage during the calcination process. In this embodiment, arc-shaped slide grooves are provided at the upper and lower edges of the feed opening 10, and the feed cover plate is an arc-shaped cover plate with the same curvature as the microwave bin body, so that it can move laterally along the arc-shaped slide groove under the drive of the first pneumatic push rod to realize the opening and closing of the feed opening. The first pneumatic push rod is hinged on the support beam between the two arc-shaped slide grooves, and the telescopic end of the first pneumatic push rod is hinged to the support on the feed cover plate, so that the feed cover plate can be moved by utilizing the telescopic movement of the first pneumatic push rod.

[0023] The discharge assembly 4 includes a discharge opening 13 provided at the lower part of the side wall of the microwave bin body 2, a discharge cover plate 14 is hinged at the upper edge of the discharge opening 13, and a second pneumatic push rod 15 for controlling the discharge cover plate 14 to cover the discharge opening 13 is provided between the discharge cover plate 14 and the microwave bin body 2. A guide groove 16 is connected to the lower edge of the discharge opening 13. A sealing rubber ring is provided between the discharge opening 13 and the discharge cover plate 14. The sealing rubber ring can improve the sealing performance in the covered state and avoid gas leakage during the calcination process. In this embodiment, the upper edge of the discharge cover plate is hinged on the support of the side wall of the microwave bin body, and the second pneumatic push rod is also hinged on the support, and a support block is fixedly provided on the discharge cover plate, and the support block is hinged to the telescopic end of the second pneumatic push rod, so that the discharge cover plate can be driven to cover the discharge opening or be separated from the discharge opening by the telescopic movement of the second pneumatic push rod.

[0024] When this embodiment is in use, the feed opening is corresponded to the feed conveyor belt of a conventional desulfurization gypsum production line, and the material guide trough at the discharge opening is corresponded to the discharge conveyor belt of the production line. During feeding, the desulfurization gypsum is directly conveyed into the microwave bin body through the feed opening by the feed conveyor belt. The calcined desulfurization gypsum forms semi-hydrated gypsum. During discharging, the stirring mechanism is turned on to allow the semi-hydrated gypsum to quickly pass through the discharge opening and fall on the material guide trough and then on the discharge conveyor belt for transfer.

[0025] Embodiment 3, a microwave calcining device for desulfurized gypsum, based on embodiment 2, the stirring mechanism 6 includes a driving motor 17 fixedly arranged at the bottom of the microwave bin body 2, the output end of the driving motor 17 enters the microwave bin body 2 and is provided with a conical block 18 at the end, and a blade 19 is provided on the conical block 18. In addition, in this embodiment, the conical block 18 is higher than the lower edge of the discharge opening 13 to avoid the existence of a cleaning dead angle, and the desulfurized gypsum can be discharged to the outside of the discharge opening under the centrifugal action of the conical block and the stirring action of the blades during discharge. At the same time, during calcination, the driving motor is turned on to drive the conical block and the blades to rotate, and the blades stir the desulfurized gypsum to mix it.

[0026] Embodiment 4, a microwave calcining device for desulfurized gypsum, based on embodiment 3, the exhaust channel 7 includes an exhaust pipe 20 connected to the microwave chamber body 2, and an electromagnetic valve 21 is provided on the exhaust pipe 20. An exhaust fan 22 is provided on the exhaust pipe 17. A metal filter 23 is provided at the connection between the exhaust pipe 20 and the microwave chamber body 2. In this embodiment, the electromagnetic valve is arranged between the exhaust fan and the metal filter. When exhaust is required, the exhaust pipe 20 is connected to a conventional exhaust gas purification system, the electromagnetic valve 21 and the exhaust fan 22 are opened, and the exhaust fan discharges the exhaust gas in the microwave chamber body 2 to the exhaust gas purification system. A metal filter is provided to filter the desulfurized gypsum powder that is agitated and flows to the exhaust pipe with the airflow. The metal material of the metal filter can shield the microwaves emitted by the microwave transmitter to prevent leakage.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A microwave calcination device for desulfurized gypsum, characterized in that: The invention comprises a frame (1), wherein a microwave chamber (2) is provided on the frame (1), a feeding assembly (3) and a discharging assembly (4) are provided on the side wall of the microwave chamber (2), a microwave emitter (5) is provided on the top of the microwave chamber (2), and a stirring mechanism (6) is rotatably provided on the bottom, the microwave chamber (2) is connected to an exhaust passage (7), and the stirring mechanism (6) is arranged in coordination with the discharging assembly (4).

2. The microwave calcination device for desulfurized gypsum according to claim 1, characterized in that: The microwave chamber body (2) is a spindle-shaped rotating chamber body, and a heat-insulating layer is provided outside the microwave chamber body (2).

3. The microwave calcination device for desulfurized gypsum according to claim 2, characterized in that: The frame (1) comprises a support leg (8) fixed to the side wall of the microwave chamber (2), and a fixed foot plate (9) is provided at the bottom of the support leg (8).

4. The microwave calcining device for desulfurized gypsum according to any one of claims 1 to 3, characterized in that: The feed assembly (3) comprises a feed opening (10) formed on the upper part of the side wall of the microwave chamber (2); a feed cover plate (11) for covering the feed opening (10) is slidably provided on the feed opening (10); and a first pneumatic push rod (12) for controlling the sliding of the feed cover plate (11) is provided between the feed cover plate (11) and the microwave chamber (2).

5. The microwave calcination device for desulfurized gypsum according to claim 4, characterized in that: The discharge assembly (4) comprises a discharge opening (13) formed at the lower portion of the side wall of the microwave bin body (2); a discharge cover plate (14) is hingedly connected to the upper edge of the discharge opening (13); and a second pneumatic push rod (15) is provided between the discharge cover plate (14) and the microwave bin body (2) for controlling the discharge cover plate (14) to cover the discharge opening (13).

6. The microwave calcination device for desulfurized gypsum according to claim 5, characterized in that: Sealing rubber rings are provided between the feed opening (10) and the feed cover plate (11), and between the discharge opening (13) and the discharge cover plate (14); and a material guide trough (16) is connected to the lower edge of the discharge opening (13) and the lower edge of the feed opening (10).

7. The microwave calcination device for desulfurized gypsum according to claim 5 or 6, characterized in that: The stirring mechanism (6) comprises a driving motor (17) fixedly arranged at the bottom of the microwave chamber (2); the output end of the driving motor (17) enters the microwave chamber (2) and is provided with a conical block (18) at the end, and a blade (19) is provided on the conical block (18); the conical block (18) is higher than the lower edge of the discharge opening (13).

8. The microwave calcination device for desulfurized gypsum according to claim 1, characterized in that: The exhaust passage (7) comprises an exhaust pipe (20) connected to the microwave chamber body (2), and an electromagnetic valve (21) is provided on the exhaust pipe (20).

9. The microwave calcining device for desulfurized gypsum according to claim 8, characterized in that: An exhaust fan (22) is provided on the exhaust pipe.

10. The microwave calcining device for desulfurized gypsum according to claim 9, characterized in that: A metal filter (23) is provided at the point where the exhaust pipe (20) is connected to the microwave chamber body (2).

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