Flue gas desulfurization gypsum powder treatment and deep processing system

Abstract

The invention belongs to the technical field of gypsum powder processing, and particularly relates to a flue gas desulfurization gypsum powder processing and deep processing system which comprises a crusher, a screening mechanism, a boiling calcining furnace and a finished product bin. The crushing roller pair is located in a roller cavity of the screening roller and arranged close to the lower surface of the screening roller, a gap between the crushing roller pair and the lower surface of the screening roller forms a coarse material feeding end of the crushing roller pair, two roller bodies of the crushing roller pair are arranged in a bilateral symmetry mode, and the axes of the two roller bodies are parallel to the axis of the screening roller. The crushing roller pair has a rotating freedom degree, and coarse materials below the crushing roller pair are subjected to secondary crushing from bottom to top by means of rotation of the crushing roller pair. The crushing roller pair is additionally arranged at the coarse material discharging end of the screening roller, secondary crushing is carried out in the screening roller, screening is carried out along the screening holes of the screening roller, and unqualified coarse materials collected at the coarse material discharging end of the screening mechanism are reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of gypsum powder processing, and in particular relates to a flue gas desulfurization gypsum powder processing and deep processing system. Background Art

[0002] Flue gas desulfurization gypsum is a by-product of the flue gas desulfurization process. The economic value of flue gas desulfurization gypsum is high. The deeply processed flue gas desulfurization gypsum is widely used in construction, building materials, industrial molds and other fields.

[0003] The treatment and deep processing technology of flue gas desulfurization gypsum is relatively mature, and its process mainly includes crushing - screening - calcination - ball milling - finished product. However, in the actual processing process, it is found that there is a lot of agglomerated gypsum in the flue gas desulfurization gypsum powder formed by crushing in the crusher, resulting in a lot of unqualified coarse materials collected when screening in the screening drum. The coarse materials need to be collected and re-added to the crusher for secondary crushing until they are screened into qualified fine materials. The secondary crushing and screening of coarse materials 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] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a flue gas desulfurization gypsum powder processing and deep processing system, by adding a pair of crushing rollers at the coarse material discharge end of the screening drum, during the screening process, the crushing rollers are secondary crushed in the screening drum and screened along the screen holes of the screening drum, thereby reducing the unqualified coarse material collected at the coarse material discharge end of the screening mechanism, reducing the number of secondary crushing of the coarse material by the crusher, thereby reducing the occupancy rate of the crusher and the screening mechanism by the coarse material, thereby reducing energy consumption and improving deep processing efficiency.

[0005] The specific technical solution adopted by the present invention is:

[0006] The flue gas desulfurization gypsum powder treatment and deep processing system includes a crusher, a screening mechanism, a boiling calcining furnace and a finished product bin. The flue gas desulfurization gypsum powder is crushed by the crusher and enters the feeding end of the screening mechanism. The fine material discharge end of the screening mechanism is connected with the boiling calcining furnace by means of a transmission unit. The discharge end of the boiling calcining furnace is connected with the feeding end of the finished product bin. The screening mechanism includes a frame, a screening drum and a pair of crushing rollers. The cylinder surface of the screening drum is provided with sieve holes. The bottom of the screening drum is formed as the fine material discharge end of the screening mechanism by means of the sieve holes. The screening drum is inclined by means of the frame. The port of the drum located at a high position forms the feeding end of the screening mechanism, and the port of the screening drum located at a low position forms the coarse material discharging end of the screening mechanism. The crushing roller pair is located in the cylinder cavity of the screening drum and is arranged close to the lower surface of the screening drum. The gap between the crushing roller pair and the lower surface of the screening drum forms the coarse material feeding end of the crushing roller pair. The two roller bodies of the crushing roller pair are symmetrically arranged and the axes of the two roller bodies are respectively parallel to the axis of the screening drum. The crushing roller pair has the freedom of rotation and the coarse material under the crushing roller pair is secondary crushed from bottom to top with the help of the rotation of the crushing roller pair.

[0007] A plurality of groups of retaining rings are arranged in the cylinder cavity of the screening drum at intervals along the axial direction, and the crushing roller pair is located at the intervals between adjacent retaining rings.

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

[0009] A crushing motor is fixedly connected to the frame, and the driving shaft of the crushing motor extends into the screening drum along the coarse material discharge end. A support cover is sleeved on the outer side of the driving shaft of the crushing motor, and the end of the support cover is fixedly connected to the frame. The crushing roller pair is suspended under the support cover by means of a connecting rod, and one of the roller bodies of the crushing roller pair is connected to the driving shaft of the crushing motor by means of a transmission belt passing through the support cover, and the two roller bodies of the crushing roller pair rotate in opposite directions by means of transmission gears.

[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 by means of 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 transported to the screening drum by means of the conveying screw.

[0011] The screening drum has the freedom to rotate around the axis of the screening drum with the help of a driving mechanism. The driving mechanism includes a driving motor and a plurality of driving units arranged at intervals along the axis of the screening drum. The driving unit includes a driving gear, a guide rail and a driven gear located in the guide rail. The guide rail is arranged along the circumference direction of the outer surface of the screening drum. The driven gear is sleeved on the screening drum. The driving gear is sleeved on the driving shaft of the driving motor and has the freedom to rotate. The driving gear is embedded in the guide rail and meshes with the driven gear. The screening drum rotates with the help of the cooperation between the driving gear and the driven gear.

[0012] A cleaning brush is also provided on the frame, and the cleaning brush is rotatably connected to the frame, and the surface of the cleaning brush is in contact with the outer side wall of the screening drum, so that the cleaning brush and the screening drum rotate relative to each other.

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

[0014] A ball mill is also arranged between the fluidized bed calcining furnace and the finished product bin. The discharge end of the fluidized bed calcining furnace is connected to the feed end of the ball mill, and the discharge end of the ball mill is connected to the finished product bin via a transmission unit.

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

[0016] The beneficial effects of the present invention are:

[0017] In the present invention, a pair of crushing rollers is arranged at the coarse material discharge end of the screening drum. During the screening process, the pair of crushing rollers performs secondary crushing in the screening drum and sieves along the sieve holes of the screening drum, thereby reducing the amount of unqualified coarse material collected at the coarse material discharge end of the screening mechanism and the number of secondary crushing of the coarse material by the crusher, thereby reducing the occupancy rate of the crusher and the screening mechanism by the coarse material, thereby reducing energy consumption and improving deep processing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a system process flow chart of the present invention;

[0019] Figure 2 It is a side structural diagram of the screening mechanism;

[0020] Figure 3 for Figure 2 An enlarged schematic diagram of

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the screening mechanism;

[0022] Figure 5 It is a structural schematic diagram of the screening drum along the axial direction;

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

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

[0025] Specific embodiments, such as Figure 1-5 As shown, the present invention provides a flue gas desulfurization gypsum powder processing and deep processing system, including a crusher, a screening mechanism, a boiling calcining furnace and a finished product bin. The flue gas desulfurization gypsum powder is crushed by the crusher and enters the feeding end of the screening mechanism. The fine material discharge end of the screening mechanism is connected with the boiling calcining furnace by means of a transmission unit, and the discharge end of the boiling calcining furnace is connected with the feeding end of the finished product bin. The screening mechanism includes a frame 1, a screening drum 2 and a crushing roller pair 3. The cylinder surface of the screening drum 2 is provided with sieve holes. The bottom of the screening drum 2 is formed as the fine material discharge end of the screening mechanism by means of the sieve holes. The screening drum 2 is inclined by means of the frame 1. The port of the screening drum 2 located at a high position forms the feeding end of the screening mechanism, and the port of the screening drum 2 located at a low position forms the coarse material discharging end of the screening mechanism. The crushing roller pair 3 is located in the cylinder cavity of the screening drum 2 and is arranged close to the lower surface of the screening drum 2. The gap between the crushing roller pair 3 and the lower surface of the screening drum 2 forms the coarse material feeding end of the crushing roller pair 3. The two roller bodies of the crushing roller pair 3 are symmetrically arranged and the axes of the two roller bodies are respectively parallel to the axis of the screening drum 2. The crushing roller pair 3 has the freedom of rotation and the coarse material under the crushing roller pair 3 is secondary crushed from bottom to top with the help of the rotation of the crushing roller pair 3.

[0026] In the actual processing process, it was found that there was a lot of clumped gypsum in the flue gas desulfurization gypsum powder formed by the crusher, which resulted in a lot of unqualified coarse material collected when 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 the coarse material not only occupied equipment and increased energy consumption, but also affected the processing efficiency of the deep processing of the desulfurization gypsum.

[0027] Therefore, in the present invention, a pair of crushing rollers 3 is provided at the coarse material discharge end of the screening drum 2. During the screening process, the pair of crushing rollers 3 performs secondary crushing in the screening drum 2 and sieves along the sieve holes of the screening drum 2, thereby reducing the amount of unqualified coarse material collected at the coarse material discharge end of the screening mechanism, reducing the number of secondary crushing of the coarse material by the crusher, thereby reducing the occupancy rate of the crusher and the screening mechanism by the coarse material, thereby reducing energy consumption and improving deep processing efficiency (in order to avoid the drawings in the specification from being cluttered and unclear, the sieve holes of the screening drum in the drawings are omitted).

[0028] When the screening mechanism is in use, the crushed flue gas desulfurization gypsum powder will enter the screening drum 2, and the qualified fine material will be screened out along the sieve holes on the side wall of the screening drum 2 and enter the boiling calcining furnace with the help of the elevator. The unqualified coarse material will continue to 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 contact the rotating crushing roller 3 and move to the gap between the crushing rollers 3 as the crushing rollers 3 rotate. The coarse material is crushed by the crushing rollers 3 and secondary crushing is formed. The coarse material after secondary crushing becomes finer and is screened out along the sieve 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] A plurality of groups of retaining rings 4 are arranged in the cylinder cavity of the screening drum 2 at intervals along the axial direction, and the crushing rollers 3 are located at the intervals between adjacent retaining rings 4. By arranging the retaining rings 4, the crushed materials in the screening drum 2 can be hindered, so that the crushed materials have sufficient time to be screened by the sieve holes. At the same time, the retaining rings 4 can also accumulate the crushed materials to a certain height, thereby ensuring that the coarse materials can contact the crushing rollers 3 and be crushed by the crushing rollers 3.

[0030] The rotation speed of the crushing roller pair 3 is 300-400rpm. The crushing roller pair 3 has a relatively high rotation speed. This is because the coarse material may be formed into flaky gypsum flakes after being crushed for the second time, which still does not meet the screening requirements of fine materials. The relatively high rotation speed of the crushing roller pair 3 will cause the coarse material after the second crushing to generate centrifugal force. After the second crushing, the coarse material hits the cylinder cavity of the screening drum 2 to form a third crushing, thereby crushing the flaky gypsum flakes into granular particles that meet the requirements of fine materials.

[0031] A crushing motor 5 is fixedly connected to the frame 1, and the driving 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 outer side of the driving shaft of the crushing motor 5, and the end of the support cover 6 is fixedly connected to the frame 1. The crushing roller pair 3 is suspended under the support cover 6 by means of a connecting rod 7, and one of the roller bodies of the crushing roller pair 3 is connected to the driving shaft of the crushing motor 5 by means of a transmission belt 8 passing through the support cover 6. The two roller bodies of the crushing roller pair 3 are rotated in opposite directions by means of a transmission gear 9. In the present invention, the first roller body of the crushing roller pair 3 rotates in the same direction as the driving shaft of the crushing motor 5 by means of the transmission belt 8, and the second roller body rotates in the opposite direction to the first roller body by means of the transmission gear 9, thereby ensuring that the coarse material is crushed and centrifugal force is formed to throw it upward.

[0032] The screening mechanism also includes a feed hopper 10, a conveying screw 11, and a conveying motor 12 for driving the conveying screw 11 to rotate. The output end of the crusher is connected with the feed end of the screening mechanism by means of 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 from the feed hopper 10 is conveyed to the screening drum 2 by means of the conveying screw 11. If the gypsum powder is directly poured into the screening drum 2, a large amount of gypsum powder will accumulate, so that the gypsum powder at the top of the gypsum powder pile has reached the coarse material discharge end of the screening drum 2 before being screened out. Therefore, a conveying screw 11 is provided, and the gypsum powder is transported into the screening drum 2 by the conveying screw 11 to avoid the accumulation of gypsum powder.

[0033] The screening drum 2 has the freedom to rotate around the axis of the screening drum 2 with the help of a driving mechanism. The driving mechanism includes a driving motor 13 and a plurality 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 circumference 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 end of the driving motor 13 and has the 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 with the help of the cooperation between the driving gear 14 and the driven gear 16.

[0034] A cleaning brush 17 is also provided on the frame 1, and the cleaning brush 17 is rotatably connected to the frame 1. The surface of the cleaning brush 17 fits against the outer wall of the screening drum 2, and the cleaning brush 17 and the screening drum 2 form relative rotation. The sieve holes of the screening drum 2 may be blocked by gypsum powder. Therefore, a cleaning brush 17 is provided. The cleaning brush 17 is located in the upper half of the screening drum 2. During the rotation of the screening drum 2, the circumference of the screening drum 2 will contact the cleaning brush 17. The gypsum powder in the sieve holes can be punched out by the bristles of the cleaning brush 17, thereby avoiding blockage of the sieve holes.

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

[0036] A ball mill is also provided between the fluidized bed calcining furnace and the finished product bin. The discharge end of the fluidized bed calcining furnace is connected to the feed end of the ball mill. The discharge end of the ball mill is connected to the finished product bin by means of a conveying unit. According to customer requirements, the ball mill can be selected to further grind the fine material.

[0037] The conveying unit may be any one of an elevator 18 , a conveyor belt, and an inclined slide rail. The conveying unit in this specific embodiment is the elevator 18 .

[0038] A dust collector is also arranged between the crusher and the screening mechanism. The waste gas generated by the crushing of the flue gas desulfurization gypsum powder by the crusher is collected by the dust collector. A lot of smoke and dust will be generated during the crushing process of the crusher. The smoke and dust can be absorbed by the dust collector to ensure the health of the workers.

[0039] A dryer is also arranged between the crusher and the screening mechanism, and the crushed flue gas desulfurization gypsum powder is dried by the dryer and then enters the feeding 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 calciner and a finished product bin. The flue gas desulfurization gypsum powder is crushed by the crusher and enters the feeding end of the screening mechanism. The fine material discharge end of the screening mechanism is connected with the fluidized bed calciner by means of a transmission unit. The discharge end of the fluidized bed calciner is connected with the feeding end of the finished product bin. The system is characterized in that: The screening mechanism comprises a frame (1), a screening drum (2) and a pair of crushing rollers (3); the surface of the cylinder of the screening drum (2) is provided with screening holes; the lower part of the screening drum (2) is formed as a fine material discharge end of the screening mechanism by means of the screening holes; the screening drum (2) is arranged in an inclined manner by means of the frame (1); the upper port of the screening drum (2) is formed as a material input end of the screening mechanism; the lower port of the screening drum (2) is formed as a coarse material discharge end of the screening mechanism; the pair of crushing rollers (3) is located at The crushing roller (3) is arranged in 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 roller bodies of the crushing roller (3) are arranged symmetrically on the left and right, and the axes of the two roller bodies are respectively 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 secondary crushed from bottom to top by the rotation of the crushing roller (3).

2. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1 is characterized in that: A plurality of groups of retaining rings (4) are arranged at intervals along the axial direction in the cylinder cavity of the screening drum (2), and the crushing roller pair (3) is located at the intervals between adjacent retaining rings (4).

3. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1 is characterized in that: The rotation speed of the crushing roller (3) is 300-400 rpm.

4. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1 is characterized in that: A crushing motor (5) is fixedly connected to the frame (1), and the driving 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 outer side of the driving shaft of the crushing motor (5), and the end of the support cover (6) is fixedly connected to the frame (1). The crushing roller pair (3) is suspended below the support cover (6) by means of a connecting rod (7), and one of the roller bodies of the crushing roller pair (3) is connected to the driving shaft of the crushing motor (5) by means of a transmission belt (8) passing through the support cover (6), and the two roller bodies of the crushing roller pair (3) rotate in opposite directions by means of a transmission gear (9).

5. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1 is characterized in that: The screening mechanism further comprises a feed hopper (10), a conveying screw (11) and a conveying motor (12) for driving the conveying screw (11) to rotate. The output end of the crusher is connected to the feed end of the screening mechanism by means of 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 means of the conveying screw (11).

6. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1 is characterized in that: The screening drum (2) has the freedom to rotate around the axis of the screening drum (2) by means of a driving mechanism. The driving mechanism comprises a driving motor (13) and a plurality of driving units arranged at intervals along the axis of the screening drum (2). The driving unit comprises 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 shaft of the driving motor (13) and has the 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).

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

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

9. The flue gas desulfurization gypsum powder treatment and deep processing system according to claim 1, characterized in that: A ball mill is also arranged between the fluidized bed calcining furnace and the finished product bin. The discharge end of the fluidized bed calcining furnace is connected to the feed end of the ball mill, and the discharge end of the ball mill is connected to the finished product bin via a transmission unit.

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

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