Flue gas desulfurization gypsum powder treatment and deep processing system

Abstract

This invention belongs to the field of gypsum powder processing technology, specifically relating to a flue gas desulfurization gypsum powder treatment and deep processing system. It includes a crusher, a screening mechanism, a fluidized bed calcining furnace, and a finished product silo. The screening mechanism includes a frame, a screening drum, and crushing rollers. The crushing rollers are located inside the screening drum cavity and near its lower surface. The gap between the crushing rollers and the lower surface of the screening drum forms the coarse material feed end of the crushing rollers. The two rollers of the crushing rollers are symmetrically arranged, and their axes are parallel to the axis of the screening drum. The crushing rollers have rotational freedom, and the coarse material below them undergoes secondary crushing from bottom to top due to the rotation of the rollers. This invention adds crushing rollers at the coarse material discharge end of the screening drum, allowing for secondary crushing within the screening drum and sieving through the drum's screen holes, thus reducing the amount of substandard coarse material collected at the coarse material discharge end of the screening mechanism.

Description

Technical Field

[0001] This invention belongs to the field of gypsum powder processing technology, specifically relating to a flue gas desulfurization gypsum powder treatment and deep processing system. Background Technology

[0002] Flue gas desulfurization gypsum is a byproduct of the flue gas desulfurization process. It has high economic value and is widely used in construction, building materials, industrial molds and other fields after deep processing.

[0003] The processing and deep processing technology of flue gas desulfurization gypsum is relatively mature. The main process is crushing, screening, calcination, ball milling, and finished product. However, in actual processing, it was found that there are many clumps of gypsum in the flue gas desulfurization gypsum powder formed by crushing, which leads to a large amount of unqualified coarse material collected in the screening drum. The coarse material needs to be collected and added back to the crusher for secondary crushing until it is screened into qualified fine material. The secondary crushing and screening of coarse material not only occupies equipment and increases energy consumption, but also affects the processing efficiency of the deep processing of desulfurization gypsum. Summary of the Invention

[0004] To address the problems existing in the prior art, this invention provides a flue gas desulfurization gypsum powder treatment and deep processing system. By adding crushing rollers at the coarse material discharge end of the screening drum, the crushing rollers perform secondary crushing inside the screening drum during the screening process and the material passes through the screen holes of the screening drum. This reduces the amount of unqualified coarse material collected at the coarse material discharge end of the screening mechanism, reduces the number of times the crusher performs secondary crushing on the coarse material, thereby reducing the occupancy rate of the crusher and screening mechanism, and further reducing energy consumption and improving the efficiency of deep processing.

[0005] The specific technical solution adopted in this invention is as follows:

[0006] A flue gas desulfurization gypsum powder treatment and deep processing system includes a crusher, a screening mechanism, a fluidized bed calcining furnace, and a finished product silo. The flue gas desulfurization gypsum powder is crushed by the crusher and then enters the feed end of the screening mechanism. The fine material discharge end of the screening mechanism is connected to the fluidized bed calcining furnace via a conveying unit. The discharge end of the fluidized bed calcining furnace is connected to the feed end of the finished product silo. The screening mechanism includes a frame, a screening drum, and crushing rollers. The surface of the screening drum is provided with screen holes, and the lower part of the screening drum forms the fine material discharge end of the screening mechanism through the screen holes. The screening drum is inclined with the support of the frame. The upper end of the roller forms the feed end of the screening mechanism, and the lower end of the screening roller forms the coarse material discharge end of the screening mechanism. The crushing roller is located inside the cavity of the screening roller and is set close to the lower surface of the screening roller. The gap between the crushing roller and the lower surface of the screening roller forms the coarse material feed end of the crushing roller. The two rollers of the crushing roller are symmetrically arranged from left to right, and the axes of the two rollers are parallel to the axis of the screening roller. The crushing roller has the freedom of rotation, and the coarse material below the crushing roller is subjected to secondary crushing from bottom to top by means of the rotation of the crushing roller.

[0007] Multiple sets of retaining rings are spaced apart along the axial direction inside the cylinder cavity of the screening drum, and the crushing rollers are located at the intervals between adjacent retaining rings.

[0008] The rotation speed of the crushing rollers is 300-400 rpm.

[0009] A crushing motor is fixedly connected to the frame. The drive shaft of the crushing motor extends into the screening drum along the coarse material discharge end. A support cover is sleeved on the outside of the drive shaft of the crushing motor. The end of the support cover is fixedly connected to the frame. The crushing rollers are suspended below the support cover by a connecting rod. One of the rollers of the crushing rollers is connected to the drive shaft of the crushing motor by a transmission belt passing through the support cover. The two rollers of the crushing rollers rotate in opposite directions by a transmission gear.

[0010] The screening mechanism also includes a feed hopper, a conveying screw, and a conveying motor that drives the conveying screw to rotate. The output end of the crusher is connected to the feed end of the screening mechanism via a funnel-shaped feed hopper. The conveying screw is located below the feed hopper and is arranged along the axial direction of the screening drum. The flue gas desulfurization gypsum powder falling along the feed hopper is conveyed to the screening drum via the conveying screw.

[0011] The screening drum has a degree of freedom to rotate about its axis by means of a driving mechanism. The driving mechanism includes a drive motor and multiple sets of drive units spaced apart along the axis of the screening drum. Each drive unit includes a drive gear, a guide rail, and a driven gear located in the guide rail. The guide rail is arranged along the circumference of the outer surface of the screening drum. The driven gear is sleeved on the screening drum. The drive gear is sleeved with the drive shaft of the drive motor and has a degree of freedom to rotate. The drive gear is embedded in the guide rail and meshes with the driven gear. The screening drum rotates by means of the cooperation between the drive gear and the driven gear.

[0012] The frame is also equipped with a cleaning brush, which is rotatably connected to the frame. The surface of the cleaning brush is in contact with the outer wall of the screening drum, and the cleaning brush and the screening drum rotate relative to each other.

[0013] An intermediate buffer chamber is also provided between the conveying unit and the fluidized bed calcining furnace. The discharge end of the conveying unit is connected to the inlet end of the intermediate buffer chamber, and the discharge end of the intermediate buffer chamber is connected to the inlet end of the fluidized bed calcining furnace.

[0014] A ball mill is also installed between the fluidized bed calciner and the finished product silo. The discharge end of the fluidized bed calciner is connected to the feed end of the ball mill, and the discharge end of the ball mill is connected to the finished product silo via a conveying unit.

[0015] A dust collector is also installed between the crusher and the screening mechanism, and the waste gas generated by the crushing of flue gas desulfurization gypsum powder is collected by the dust collector.

[0016] The beneficial effects of this invention are:

[0017] In this invention, a crushing roller is provided at the coarse material discharge end of the screening drum. Through the crushing roller, the material is crushed twice inside the screening drum during the screening process and passes through the screen holes of the screening drum. This reduces the amount of unqualified coarse material collected at the coarse material discharge end of the screening mechanism, reduces the number of times the crusher crushes the coarse material, thereby reducing the occupancy rate of the crusher and screening mechanism, and thus reducing energy consumption and improving the efficiency of deep processing. Attached Figure Description

[0018] Figure 1 This is a system process flow diagram of the present invention;

[0019] Figure 2 This is a side view of the screening mechanism.

[0020] Figure 3 for Figure 2 Enlarged schematic diagram;

[0021] Figure 4 This is a cross-sectional structural diagram of the screening mechanism;

[0022] Figure 5 This is a schematic diagram of the structure of the screening drum along its axial direction;

[0023] In the attached diagram, 1 is the frame, 2 is the screening drum, 3 is the crushing roller, 4 is the retaining ring, 5 is the crushing motor, 6 is the support cover, 7 is the connecting rod, 8 is the transmission belt, 9 is the transmission gear, 10 is the feed hopper, 11 is the conveying screw, 12 is the conveying motor, 13 is the drive motor, 14 is the drive gear, 15 is the guide rail, 16 is the driven gear, 17 is the cleaning brush, and 18 is the elevator. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0025] Specific embodiments, such as Figure 1-5 As shown, this invention provides a flue gas desulfurization gypsum powder treatment and deep processing system, including a crusher, a screening mechanism, a fluidized bed calcining furnace, and a finished product silo. The flue gas desulfurization gypsum powder is crushed by the crusher and then enters the feed end of the screening mechanism. The fine material discharge end of the screening mechanism is connected to the fluidized bed calcining furnace via a conveying unit. The discharge end of the fluidized bed calcining furnace is connected to the feed end of the finished product silo. The screening mechanism includes a frame 1, a screening drum 2, and crushing rollers 3. The surface of the screening drum 2 is provided with screen holes, and the lower part of the screening drum 2 forms the fine material discharge end of the screening mechanism through the screen holes. The screening drum 2 is inclined with the support of the frame 1. The upper end of the screening drum 2 serves as the feed end of the screening mechanism, and the lower end of the screening drum 2 serves as the coarse material discharge end of the screening mechanism. The crushing roller 3 is located inside the cylinder cavity of the screening drum 2 and is positioned close to the lower surface of the screening drum 2. The gap between the crushing roller 3 and the lower surface of the screening drum 2 forms the coarse material feed end of the crushing roller 3. The two rollers of the crushing roller 3 are symmetrically arranged on the left and right, and the axes of the two rollers are parallel to the axis of the screening drum 2. The crushing roller 3 has a degree of freedom of rotation, and the coarse material below the crushing roller 3 is subjected to secondary crushing from bottom to top by means of the rotation of the crushing roller 3.

[0026] In actual processing, it was found that the flue gas desulfurization gypsum powder formed by the crusher contained a lot of clumps of gypsum, which resulted in a lot of unqualified coarse material being collected during screening in the screening drum 2. The coarse material needed to be collected and added back into the crusher for secondary crushing until it was screened into qualified fine material. The secondary crushing and screening of coarse material not only occupied equipment and increased energy consumption, but also affected the processing efficiency of the deep processing of desulfurization gypsum.

[0027] Therefore, in this invention, a crushing roller 3 is provided at the coarse material discharge end of the screening drum 2. Through the crushing roller 3, secondary crushing is carried out in the screening drum 2 during the screening process, and the material passes through the screen holes of the screening drum 2. This reduces the amount of unqualified coarse material collected at the coarse material discharge end of the screening mechanism, reduces the number of times the crusher performs secondary crushing on the coarse material, thereby reducing the occupancy rate of the crusher and screening mechanism, and thus reducing energy consumption and improving the efficiency of deep processing (to avoid clutter and unclear drawings in the specification, the screen holes of the screening drum in the drawings are omitted).

[0028] When the screening mechanism is in use, the pulverized flue gas desulfurization gypsum powder enters the screening drum 2. The qualified fine material will be screened out through the screen holes on the side wall of the screening drum 2 and enter the fluidized bed calcining furnace by means of the elevator. The unqualified coarse material will roll down along the inclined side wall of the screening drum 2 until it reaches the crushing roller 3. Due to the large volume of the coarse material, it will come into contact with the rotating crushing roller 3 and move towards the gap between the crushing roller 3 as the crushing roller 3 rotates. The coarse material is crushed by the crushing roller 3 and forms secondary crushing. The coarse material after secondary crushing becomes finer and is screened out through the screen holes on the side wall of the screening drum 2, thereby reducing the unqualified coarse material collected at the coarse material discharge end of the screening mechanism.

[0029] Multiple sets of retaining rings 4 are spaced apart along the axial direction inside the cylinder cavity of the screening drum 2. The crushing roller 3 is located at the interval between adjacent retaining rings 4. By setting the retaining rings 4, the crushed material in the screening drum 2 can be obstructed, so that the crushed material has enough time to be screened by the screen holes. At the same time, the retaining rings 4 can also accumulate the crushed material to a certain height, so as to ensure that the coarse material can contact the crushing roller 3 and be crushed by the crushing roller 3.

[0030] The rotation speed of the crushing roller 3 is 300-400 rpm. The crushing roller 3 has a high rotation speed because after the coarse material is crushed twice, it may form flaky gypsum flakes, which still do not meet the screening requirements of fine material. The high rotation speed of the crushing roller 3 will cause the coarse material after the second crushing to generate centrifugal force. After the second crushing, the coarse material will hit the cylinder cavity of the screening roller 2 to form a third crushing, thereby crushing the flaky gypsum flakes into granules that meet the requirements of fine material.

[0031] A crushing motor 5 is fixedly connected to the frame 1. The drive shaft of the crushing motor 5 extends into the screening drum 2 along the coarse material discharge end. A support cover 6 is sleeved on the outside of the drive shaft of the crushing motor 5. The end of the support cover 6 is fixedly connected to the frame 1. The crushing rollers 3 are suspended below the support cover 6 by means of a connecting rod 7. One of the rollers of the crushing rollers 3 is connected to the drive shaft of the crushing motor 5 by means of a transmission belt 8 passing through the support cover 6. The two rollers of the crushing rollers 3 rotate in opposite directions by means of a transmission gear 9. In this invention, the first roller of the crushing rollers 3 rotates in the same direction as the drive shaft of the crushing motor 5 by means of a transmission belt 8, and the second roller rotates in the opposite direction to the first roller by means of a transmission gear 9, thereby ensuring that the coarse material is crushed and thrown upward by centrifugal force.

[0032] The screening mechanism also includes a feed hopper 10, a conveying screw 11, and a conveying motor 12 that drives the conveying screw 11 to rotate. The output end of the crusher is connected to the feed end of the screening mechanism via the funnel-shaped feed hopper 10. The conveying screw 11 is located below the feed hopper 10 and is arranged along the axial direction of the screening drum 2. The flue gas desulfurization gypsum powder falling along the feed hopper 10 is conveyed to the screening drum 2 by the conveying screw 11. If the gypsum powder is directly poured into the screening drum 2, it will cause a large amount of gypsum powder to accumulate, so that the gypsum powder at the top of the gypsum powder pile will reach the coarse material discharge end of the screening drum 2 before it is screened out. Therefore, the conveying screw 11 is provided to transport the gypsum powder into the screening drum 2 to avoid the accumulation of gypsum powder.

[0033] The screening drum 2 has a degree of freedom to rotate around its axis by means of a driving mechanism. The driving mechanism includes a driving motor 13 and multiple sets of driving units spaced apart along the axis of the screening drum 2. Each driving unit includes a driving gear 14, a guide rail 15, and a driven gear 16 located in the guide rail 15. The guide rail 15 is arranged along the circumference of the outer surface of the screening drum 2. The driven gear 16 is sleeved on the screening drum 2. The driving gear 14 is sleeved with the driving end of the driving motor 13 and has a degree of freedom to rotate. The driving gear 14 is embedded in the guide rail 15 and meshes with the driven gear 16. The screening drum 2 rotates by means of the cooperation between the driving gear 14 and the driven gear 16.

[0034] The frame 1 is also equipped with a cleaning brush 17, which is rotatably connected to the frame 1. The surface of the cleaning brush 17 is in contact with the outer wall of the screening roller 2, and the cleaning brush 17 and the screening roller 2 rotate relative to each other. The screen holes of the screening roller 2 may be blocked by gypsum powder, so the cleaning brush 17 is provided. The cleaning brush 17 is located in the upper part of the screening roller 2. During the rotation of the screening roller 2, the circumference of the screening roller 2 will contact the cleaning brush 17. The bristles of the cleaning brush 17 will push out the gypsum powder in the screen holes, thereby avoiding screen blockage.

[0035] An intermediate buffer chamber is also provided between the conveying unit and the fluidized bed calcining furnace. The discharge end of the conveying unit is connected to the inlet end of the intermediate buffer chamber, and the discharge end of the intermediate buffer chamber is connected to the inlet end of the fluidized bed calcining furnace.

[0036] A ball mill is also installed between the fluidized bed calciner and the finished product silo. The discharge end of the fluidized bed calciner is connected to the feed end of the ball mill, and the discharge end of the ball mill is connected to the finished product silo via a conveying unit. According to customer requirements, the ball mill can be used to further grind the fine materials.

[0037] The conveying unit can be any one of the following: hoist 18, conveyor belt, or inclined slide rail. In this specific embodiment, the conveying unit is hoist 18.

[0038] A dust collector is also installed between the crusher and the screening mechanism. The waste gas generated by the crusher is collected by the dust collector. The crusher will generate a lot of smoke and dust during the crushing process. The dust collector can absorb the smoke and dust to ensure the health of the staff.

[0039] A dryer is also installed between the crusher and the screening mechanism. The crushed flue gas desulfurization gypsum powder is dried by the dryer and then enters the feed end of the screening mechanism.

Claims

1. A flue gas desulfurization gypsum powder treatment and deep processing system, comprising a crusher, a screening mechanism, a fluidized bed calcining furnace, and a finished product silo. The flue gas desulfurization gypsum powder is crushed by the crusher and then enters the feed end of the screening mechanism. The fine material discharge end of the screening mechanism is connected to the fluidized bed calcining furnace via a conveying unit. The discharge end of the fluidized bed calcining furnace is connected to the feed end of the finished product silo. The system is characterized in that... The screening mechanism includes a frame (1), a screening drum (2), and crushing rollers (3). The surface of the screening drum (2) is provided with screen holes. The lower part of the screening drum (2) forms the fine material discharge end of the screening mechanism through the screen holes. The screening drum (2) is inclined with the support of the frame (1). The upper end of the screening drum (2) forms the feed end of the screening mechanism, and the lower end forms the coarse material discharge end of the screening mechanism. The crushing rollers (3) are located at... The material is placed inside the cylinder cavity of the screening drum (2) and close to the lower surface of the screening drum (2). The gap between the crushing roller (3) and the lower surface of the screening drum (2) forms the coarse material feeding end of the crushing roller (3). The two rollers of the crushing roller (3) are arranged symmetrically on the left and right, and the axes of the two rollers are parallel to the axis of the screening drum (2). The crushing roller (3) has the freedom of rotation, and the coarse material below the crushing roller (3) is crushed from bottom to top by means of the rotation of the crushing roller (3). A crushing motor (5) is fixedly connected to the frame (1). The drive shaft of the crushing motor (5) extends into the screening drum (2) along the coarse material discharge end. A support cover (6) is sleeved on the outside of the drive shaft of the crushing motor (5). The end of the support cover (6) is fixedly connected to the frame (1). The crushing roller (3) is suspended below the support cover (6) by means of a connecting rod (7). One of the rollers of the crushing roller (3) is connected to the drive shaft of the crushing motor (5) by means of a transmission belt (8) passing through the support cover (6). The two rollers of the crushing roller (3) rotate in opposite directions by means of a transmission gear (9), and the gap between the two rollers rotates from bottom to top. The rotation speed of the crushing roller (3) is 300-400 rpm. After the coarse material is crushed twice, it forms a flaky gypsum sheet, which still does not meet the screening requirements of fine material. The high-speed crushing roller (3) will cause the coarse material to generate centrifugal force after secondary crushing. After secondary crushing, the coarse material will hit the cylinder cavity of the screening roller (2) to form a third crushing, thereby crushing the flaky gypsum sheet into granules that meet the requirements of fine material.

2. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1, characterized in that, The screening drum (2) has multiple sets of retaining rings (4) spaced apart along the axial direction inside the drum cavity, and the crushing roller (3) is located at the interval between adjacent retaining rings (4).

3. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1, characterized in that, The screening mechanism also includes a feed hopper (10), a conveying screw (11), and a conveying motor (12) that drives the conveying screw (11) to rotate. The output end of the crusher is connected to the feed end of the screening mechanism through the funnel-shaped feed hopper (10). The conveying screw (11) is located below the feed hopper (10) and is set along the axial direction of the screen drum (2). The flue gas desulfurization gypsum powder falling along the feed hopper (10) is conveyed to the screen drum (2) through the conveying screw (11).

4. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1, characterized in that, The screening drum (2) has a degree of freedom to rotate around the axis of the screening drum (2) by means of a driving mechanism. The driving mechanism includes a driving motor (13) and multiple sets of driving units spaced apart along the axis of the screening drum (2). The driving unit includes a driving gear (14), a guide rail (15) and a driven gear (16) located in the guide rail (15). The guide rail (15) is arranged along the circumferential direction of the outer surface of the screening drum (2). The driven gear (16) is sleeved on the screening drum (2). The driving gear (14) is sleeved with the driving shaft of the driving motor (13) and has a degree of freedom to rotate. The driving gear (14) is embedded in the guide rail (15) and meshes with the driven gear (16). The screening drum (2) rotates by means of the cooperation between the driving gear (14) and the driven gear (16).

5. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1, characterized in that, The frame (1) is also provided with a cleaning brush (17), which is rotatably connected to the frame (1). The surface of the cleaning brush (17) is in contact with the outer wall of the screening drum (2), and the cleaning brush (17) and the screening drum (2) rotate relative to each other.

6. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1, characterized in that, An intermediate buffer chamber is also provided between the conveying unit and the fluidized bed calcining furnace. The discharge end of the conveying unit is connected to the inlet end of the intermediate buffer chamber, and the discharge end of the intermediate buffer chamber is connected to the inlet end of the fluidized bed calcining furnace.

7. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1, characterized in that, A ball mill is also installed between the fluidized bed calciner and the finished product silo. The discharge end of the fluidized bed calciner is connected to the feed end of the ball mill, and the discharge end of the ball mill is connected to the finished product silo via a conveying unit.

8. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1, characterized in that, A dust collector is also installed between the crusher and the screening mechanism, and the waste gas generated by the crushing of flue gas desulfurization gypsum powder is collected by the dust collector.

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