Waste slurry treatment system and waste slurry treatment method for sweeping pit of pipeline transportation coal slurry dehydration workshop

Abstract

The invention discloses a waste slurry treatment device for a sweeping pit of a pipeline conveying coal slurry dehydration workshop. The waste slurry treatment device comprises the sweeping pit, the sweeping pit is connected with a centrifugal liquid barrel through a supernatant unit, the output end of the centrifugal liquid barrel is connected with a centrifugal pump through a first pipeline, the output end of the centrifugal pump is connected with a concentration tank through a second pipeline, and the sweeping pit is connected with the centrifugal liquid barrel through a waste slurry unit. The invention further discloses a waste slurry treatment method. According to the waste slurry treatment device and the waste slurry treatment method for the sweeping pit of the pipeline transportation coal slurry dehydration workshop, the supernate and the waste slurry in the sweeping pit are separately treated, so that differentiated utilization and cyclic utilization of resources are realized, and the problems of waste slurry treatment of the sweeping pit of the pipeline transportation coal slurry dehydration workshop and large load of a subsequent concentration tank and sewage treatment are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of waste slurry disposal, and in particular relates to a waste slurry disposal system for a sweeping pit in a pipeline coal slurry dewatering workshop, and also relates to a waste slurry disposal method. Background Art

[0002] The terminal products of long-distance pipeline coal slurry mainly include high-concentration water-coal slurry, centrifugal coal, filter press coal, etc. The dewatering workshop is equipped with large equipment such as centrifuges, filter presses, scraper conveyors, belt conveyors, etc. The particularity of long-distance pipeline coal slurry transportation requires fine particle size. In the dewatering process of centrifuges and filter presses, due to leakage, splashing and dust falling to the ground during storage and transportation, the equipment and the ground need to be flushed, which will produce a large amount of flushing wastewater, causing the sweeping pit liquid level to be too high. After the sweeping pit wastewater reaches a certain liquid level, it is pumped to the concentration tank by a pump. The concentration of these waste slurries fluctuates widely. Directly sending them to the concentration tank for concentration will increase the workload of the concentration tank and the subsequent sewage treatment stage; at the same time, the low feed concentration of the concentration tank will prolong the residence time of the material in the concentration tank, and the bottom flow concentration of the concentration tank will be low, which will affect the filtration effect of the filter press. In the existing waste slurry disposal technology, the workload of the concentration tank and the subsequent sewage treatment stage is high, the working efficiency of the concentration tank is low, and the sweeping pit waste slurry cannot be reused in the production system. Summary of the invention The purpose of the present invention is to provide a waste slurry disposal system for a sweeping pit in a pipeline coal slurry dewatering workshop, which solves the problem of heavy load on the waste slurry disposal in the sweeping pit in the pipeline coal slurry dewatering workshop and the subsequent thickening tank and sewage treatment.

[0003] Another object of the present invention is to provide a method for disposing of waste pulp.

[0004] The technical solution adopted by the present invention is a waste slurry disposal system for a sweeping pit in a pipeline coal slurry dewatering workshop, comprising a sweeping pit, wherein the sweeping pit is connected to a centrifugal liquid barrel through a supernatant unit, the output end of the centrifugal liquid barrel is connected to a centrifugal pump through a first pipeline, the output end of the centrifugal pump is connected to a concentrating tank through a second pipeline, and the sweeping pit is connected to the centrifugal liquid barrel through the waste slurry unit.

[0005] The present invention is also characterized in that: The supernatant unit includes a first submersible slurry pump, which is arranged in the sweeping pit. The first submersible slurry pump is connected to a centrifuge stabilizing barrel through a supernatant pipeline, the input end of the centrifuge stabilizing barrel is connected to a pipe-fed coal slurry delivery pipe, the output end of the centrifuge stabilizing barrel is connected to a centrifuge through a third pipeline, the first output end of the centrifuge is connected to a centrifugal coal discharge chute, the second output end of the centrifuge is connected to a centrifuge liquid delivery pipe, and the other end of the centrifuge liquid delivery pipe is connected to the centrifuge liquid barrel.

[0006] The waste slurry unit comprises a second submerged slurry pump, which is arranged in the sweeping pit and connected to the centrifugal liquid barrel through a waste slurry pipeline at the bottom of the sweeping pit.

[0007] The arrangement height of the first submersible slurry pump in the sweeping pit is greater than the arrangement height of the second submersible slurry pump in the sweeping pit.

[0008] The sweeping pit is equipped with an online concentration meter, an ultrasonic level meter and a jet agitator.

[0009] A flow meter is provided on the supernatant pipeline.

[0010] Another technical solution adopted by the present invention is a waste pulp disposal method, comprising the following steps: S1. After the feeding of the sweeping pit is completed, the waste slurry is allowed to settle to form a supernatant and waste slurry; S2. Turn on the first submerged slurry pump, deliver the supernatant to the centrifuge stabilizing barrel, then turn off the first submerged slurry pump, dilute the supernatant to the coal slurry delivery pipe, deliver the coal slurry to the inner pipe of the delivery pipe, and then enter the centrifuge for centrifugation, and deliver the centrifuge to the centrifuge barrel; S3. Turn on the jet agitator to fully mix the waste slurry, then turn on the second submerged slurry pump to transport the waste slurry in the sweeping pit to the centrifugal liquid barrel; S4. The centrifugal liquid in the barrel is mixed and transported to the concentration tank via a centrifugal pump.

[0011] The beneficial effects of the present invention are: The present invention provides a waste slurry disposal system and method for a sweeping pit in a pipeline coal slurry dewatering workshop. A submersible slurry pump, a jet agitator, an ultrasonic level meter, and an online concentration meter are arranged in the sweeping pit. Since the waste slurry concentration in the sweeping pit is low and settles quickly, the liquid level and concentration of the sweeping pit are monitored online, and the supernatant is transported to the centrifuge feed stabilization barrel via the submersible slurry pump for diluting the pipeline coal slurry, so that the waste water is recycled and water is saved in the pipeline coal slurry centrifugal dilution process; after the supernatant is pumped, the jet agitator is started to mix the remaining material in the sweeping pit and then pumped to the centrifuge liquid barrel by the submersible slurry pump, and enters the concentration tank together with the centrifuge liquid; mixing the waste slurry at the bottom of the sweeping pit with the centrifuge liquid and entering the concentration tank can increase the feed concentration of the concentration tank, which is beneficial to accelerate the sedimentation rate of the material in the concentration tank, increase the bottom flow concentration of the concentration tank, and improve the working efficiency of the concentration tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the waste slurry disposal system of the sweeping pit of the pipeline coal slurry dewatering workshop of the present invention.

[0013] In the figure, 1. sweeping pit, 2. centrifugal liquid barrel, 3. first pipeline, 4. centrifugal pump, 5. second pipeline, 6. thickening tank, 7. first submerged slurry pump, 8. supernatant pipeline, 9. centrifuge stabilizing barrel, 10. pipe-fed coal slurry delivery pipe, 11. third pipeline, 12. centrifuge, 13. centrifugal coal unloading chute, 14. centrifugal liquid delivery pipe, 15. second submerged slurry pump, 16. waste slurry pipeline at the bottom of the sweeping pit, 17. online concentration meter, 18. ultrasonic level meter, 19. jet agitator, 20. flow meter. DETAILED DESCRIPTION

[0014] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0015] The present invention provides a waste slurry disposal system for a pipeline coal slurry dewatering workshop, such as Figure 1 As shown, it includes a sweeping pit 1, which is connected to a centrifugal liquid barrel 2 through a supernatant unit, and the output end of the centrifugal liquid barrel 2 is connected to a centrifugal pump 4 through a first pipeline 3, and the output end of the centrifugal pump 4 is connected to a concentration tank 6 through a second pipeline 5. The sweeping pit 1 is connected to the centrifugal liquid barrel 2 through a waste slurry unit; the supernatant unit includes a first submerged slurry pump 7, which is arranged in the sweeping pit 1, and the first submerged slurry pump 7 is connected to a centrifuge stabilizing barrel 9 through a supernatant pipeline 8. The first submerged slurry pump 7 is used to pump the supernatant in the sweeping pit 1, and the input end of the centrifuge stabilizing barrel 9 is connected to a pipe-transported coal slurry delivery pipe 10, and the output end of the centrifuge stabilizing barrel 9 is connected to a centrifuge 12 through a third pipeline 11, and the first output end of the centrifuge 12 is connected to a centrifugal coal unloading chute 13, and the second output end of the centrifuge 12 is connected to a centrifugal liquid delivery chute 14. Tube 14, the other end of the centrifugal liquid delivery pipe 14 is connected to the centrifugal liquid barrel 2; the waste slurry unit includes a second submerged slurry pump 15, the second submerged slurry pump 15 is arranged in the sweeping pit 1, the second submerged slurry pump 15 is connected to the centrifugal liquid barrel 2 through the waste slurry pipeline 16 at the bottom of the sweeping pit, and the second submerged slurry pump 15 is used to pump the waste slurry at the bottom of the sweeping pit 1; the arrangement height of the first submerged slurry pump 7 in the sweeping pit 1 is greater than the arrangement height of the second submerged slurry pump 15 in the sweeping pit 1; an online concentration meter 17, an ultrasonic level meter 18 and a jet agitator 19 are arranged in the sweeping pit 1; a flow meter 20 is provided on the supernatant pipeline 8, the online concentration meter 17 is used to monitor the concentration change of the slurry in the sweeping pit 1 in real time, the ultrasonic level meter 18 is used to monitor the liquid level in the sweeping pit 1, and the jet agitator 19 is used to stir the slurry in the sweeping pit 1.

[0016] The waste pulp disposal method provided by the present invention comprises the following steps: S1. When the sweeping pit is fed, the first submerged slurry pump, the second submerged slurry pump and the jet agitator remain closed, and when the sweeping pit is fed, the waste slurry is allowed to settle to form a supernatant and waste slurry; S2. Turn on the first submerged slurry pump, transfer the supernatant to the centrifuge stabilizing barrel, then turn off the first submerged slurry pump, dilute the supernatant to the coal slurry conveying pipe, transfer the coal slurry to the inner pipe of the conveying pipe, and realize the recycling of wastewater. Then the wastewater enters the centrifuge for centrifugation, and the centrifuge is transferred to the centrifuge liquid barrel, thereby improving the centrifugal effect of the centrifuge and reducing the moisture content of the centrifuged coal; S3. Turn on the jet agitator to fully mix the waste slurry, then turn on the second submerged slurry pump to transport the waste slurry in the sweeping pit to the centrifugal liquid barrel; S4. The centrifugal liquid barrel is mixed and transported to the concentration tank through a centrifugal pump. The waste slurry in the sweeping pit has a high concentration of sediment at the bottom after sedimentation. Stirring and mixing it to the centrifugal liquid barrel can increase the concentration of the centrifugal liquid, that is, increase the feed concentration of the concentration tank, and play a role in accelerating the concentration and sedimentation speed of the material in the concentration tank.

[0017] Example 1 The waste slurry disposal system for the pipeline coal slurry dewatering workshop provided in this embodiment is as follows: Figure 1 As shown, it includes a sweeping pit 1, which is connected to a centrifugal liquid barrel 2 through a supernatant unit, the output end of the centrifugal liquid barrel 2 is connected to a centrifugal pump 4 through a first pipeline 3, the output end of the centrifugal pump 4 is connected to a concentration tank 6 through a second pipeline 5, and the sweeping pit 1 is connected to the centrifugal liquid barrel 2 through a waste pulp unit.

[0018] Example 2 The waste slurry disposal system for the pipeline coal slurry dewatering workshop provided in this embodiment is as follows: Figure 1 As shown, it includes a sweeping pit 1, which is connected to a centrifugal liquid barrel 2 through a supernatant unit, the output end of the centrifugal liquid barrel 2 is connected to a centrifugal pump 4 through a first pipeline 3, and the output end of the centrifugal pump 4 is connected to a concentration tank 6 through a second pipeline 5. The sweeping pit 1 is connected to the centrifugal liquid barrel 2 through a waste slurry unit; the supernatant unit includes a first submerged slurry pump 7, which is arranged in the sweeping pit 1, and the first submerged slurry pump 7 is connected to a centrifuge stabilizing barrel 9 through a supernatant pipeline 8, and the input end of the centrifuge stabilizing barrel 9 is connected to The pipe-fed coal slurry delivery pipe 10, the output end of the centrifuge stabilizing barrel 9 is connected to the centrifuge 12 through the third pipeline 11, the first output end of the centrifuge 12 is connected to the centrifugal coal unloading chute 13, the second output end of the centrifuge 12 is connected to the centrifuge liquid delivery pipe 14, and the other end of the centrifuge liquid delivery pipe 14 is connected to the centrifuge liquid barrel 2; the waste slurry unit includes a second submerged slurry pump 15, the second submerged slurry pump 15 is arranged in the sweeping pit 1, and the second submerged slurry pump 15 is connected to the centrifuge liquid barrel 2 through the waste slurry pipeline 16 at the bottom of the sweeping pit.

[0019] Example 3 The waste slurry disposal system for the pipeline coal slurry dewatering workshop provided in this embodiment is as follows: Figure 1As shown, it includes a sweeping pit 1, which is connected to a centrifugal liquid barrel 2 through a supernatant unit, and the output end of the centrifugal liquid barrel 2 is connected to a centrifugal pump 4 through a first pipeline 3, and the output end of the centrifugal pump 4 is connected to a concentration tank 6 through a second pipeline 5. The sweeping pit 1 is connected to the centrifugal liquid barrel 2 through a waste slurry unit; the supernatant unit includes a first submerged slurry pump 7, which is arranged in the sweeping pit 1, and the first submerged slurry pump 7 is connected to a centrifuge stabilizing barrel 9 through a supernatant pipeline 8. The input end of the centrifuge stabilizing barrel 9 is connected to a pipe-transported coal slurry delivery pipe 10, and the output end of the centrifuge stabilizing barrel 9 is connected to a centrifuge 12 through a third pipeline 11. The centrifuge 12 first The output end is connected to a centrifugal coal discharge chute 13, the second output end of the centrifuge 12 is connected to a centrifugal liquid delivery pipe 14, and the other end of the centrifugal liquid delivery pipe 14 is connected to a centrifugal liquid barrel 2; the waste slurry unit includes a second submerged slurry pump 15, the second submerged slurry pump 15 is arranged in the sweeping pit 1, and the second submerged slurry pump 15 is connected to the centrifugal liquid barrel 2 through a waste slurry pipeline 16 at the bottom of the sweeping pit; the arrangement height of the first submerged slurry pump 7 in the sweeping pit 1 is greater than the arrangement height of the second submerged slurry pump 15 in the sweeping pit 1; an online concentration meter 17, an ultrasonic level meter 18 and a jet agitator 19 are arranged in the sweeping pit 1; a flow meter 20 is provided on the supernatant pipeline 8.

[0020] Example 4 The waste slurry disposal method proposed in this embodiment includes the following steps: S1. After the feeding of the sweeping pit is completed, the waste slurry is allowed to settle to form a supernatant and waste slurry; S2. Turn on the first submerged slurry pump, deliver the supernatant to the centrifuge stabilizing barrel, then turn off the first submerged slurry pump, dilute the supernatant to the coal slurry delivery pipe, deliver the coal slurry to the inner pipe of the delivery pipe, and then enter the centrifuge for centrifugation, and deliver the centrifuge to the centrifuge barrel; S3. Turn on the jet agitator to fully mix the waste slurry, then turn on the second submerged slurry pump to transport the waste slurry in the sweeping pit to the centrifugal liquid barrel; S4. The centrifugal liquid in the barrel is mixed and transported to the concentration tank via a centrifugal pump.

Claims

1. The waste slurry disposal system of the sweeping pit in the pipeline coal slurry dewatering workshop is characterized by: including a sweeping pit (1), The sweeping pit (1) is connected to a centrifugal liquid barrel (2) via a supernatant unit; the output end of the centrifugal liquid barrel (2) is connected to a centrifugal pump (4) via a first pipeline (3); the output end of the centrifugal pump (4) is connected to a concentration tank (6) via a second pipeline (5); and the sweeping pit (1) is connected to the centrifugal liquid barrel (2) via a waste pulp unit.

2. The waste slurry disposal system for the pipeline coal slurry dewatering workshop according to claim 1 is characterized in that: The supernatant liquid unit comprises a first submerged slurry pump (7), the first submerged slurry pump (7) being arranged in the sweeping pit (1), the first submerged slurry pump (7) being connected to a centrifuge stabilizing barrel (9) via a supernatant liquid pipeline (8), the input end of the centrifuge stabilizing barrel (9) being connected to a pipe-fed coal slurry delivery pipe (10), the output end of the centrifuge stabilizing barrel (9) being connected to a centrifuge (12) via a third pipeline (11), the first output end of the centrifuge (12) being connected to a centrifugal coal discharge chute (13), the second output end of the centrifuge (12) being connected to a centrifugal liquid delivery pipe (14), the other end of the centrifugal liquid delivery pipe (14) being connected to the centrifugal liquid barrel (2).

3. The waste slurry disposal system for the pipeline coal slurry dewatering workshop according to claim 2 is characterized in that: The waste slurry unit comprises a second submerged slurry pump (15), the second submerged slurry pump (15) being arranged in the sweeping pit (1), and the second submerged slurry pump (15) being connected to the centrifugal liquid barrel (2) via a waste slurry pipeline (16) at the bottom of the sweeping pit.

4. The waste slurry disposal system for the pipeline coal slurry dewatering workshop according to claim 3 is characterized in that: The arrangement height of the first submersible slurry pump (7) in the sweeping pit (1) is greater than the arrangement height of the second submersible slurry pump (15) in the sweeping pit (1).

5. The waste slurry disposal system for the pipeline coal slurry dewatering workshop according to claim 4 is characterized in that: An online concentration meter (17), an ultrasonic level meter (18) and a jet agitator (19) are provided in the sweeping pit (1).

6. The waste slurry disposal system for the pipeline coal slurry dewatering workshop according to claim 5 is characterized in that: The supernatant liquid pipeline (8) is provided with a flow meter (20).

7. A method for treating waste pulp, characterized in that: The waste slurry disposal system for the pipeline coal slurry dewatering workshop according to claim 6 comprises the following steps: S1. After the feeding of the sweeping pit is completed, the waste slurry is allowed to settle to form a supernatant and waste slurry; S2. Turn on the first submerged slurry pump, deliver the supernatant to the centrifuge stabilizing barrel, then turn off the first submerged slurry pump, dilute the supernatant to the coal slurry delivery pipe, deliver the coal slurry to the inner pipe of the delivery pipe, and then enter the centrifuge for centrifugation, and deliver the centrifuge to the centrifuge barrel; S3. Turn on the jet agitator to fully mix the waste slurry, then turn on the second submerged slurry pump to transport the waste slurry in the sweeping pit to the centrifugal liquid barrel; S4. The centrifugal liquid in the barrel is mixed and transported to the concentration tank via a centrifugal pump.

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