System and method for adjusting concentration of fed coal slurry of sedimentation filtration type centrifugal machine

Abstract

The invention provides a sedimentation filtration type centrifuge feeding coal slurry concentration adjusting system and method.The adjusting system comprises a centrifuge feeding buffer box, a sedimentation filtration type centrifuge and a circulating water pool, and a feeding pipeline of the centrifuge feeding buffer box is provided with a first flow meter and a concentration meter; an outlet of the centrifugal machine feeding buffer box is connected with an inlet of the sedimentation filtering type centrifugal machine, an outlet of the circulating water pool is connected to the centrifugal machine feeding buffer box through a circulating water pipeline, a second flow meter and an electric ball valve are arranged on the circulating water pipeline, and centrifugal liquid of the sedimentation filtering type centrifugal machine is connected to a centrifugal liquid barrel through a pipeline. An outlet of the centrifugal liquid barrel is connected to an inlet of the thickener; an overflow port of the thickener is connected with an inlet of the circulating water tank. Automatic adjustment of the system can be achieved according to changes of the feeding amount and the concentration of the pipeline conveying coal slurry, and human intervention is not needed.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of slurry pipeline transportation, and particularly relates to a slurry concentration adjusting system and method for a settling-filtering centrifuge. BACKGROUND

[0002] The settling-filtering centrifuge plays a key role in the coal slurry dehydration process of pipeline transportation, and the solid-liquid separation efficiency directly affects the quality of the final product of the pipeline coal slurry. As a core control parameter, the settling-filtering centrifuge feeding concentration is generally high, far greater than the optimal feeding concentration of the settling-filtering centrifuge, under the condition of ensuring the transportation capacity and reliability, due to the influence of the front-end pipeline transportation process. The excessively high concentration will lead to an increase in the load of the settling-filtering centrifuge, a decrease in the separation efficiency, and even cause the equipment to be blocked. The excessively low concentration will reduce the processing capacity and increase the energy consumption. At present, the pipeline coal slurry is directly fed into the settling-filtering centrifuge dehydration system without concentration adjustment, which leads to poor solid-liquid separation effect of the settling-filtering centrifuge, high product moisture, and product quality that cannot meet the user requirements. In addition, the concentration change of the pipeline coal slurry leads to unstable operation of the settling-filtering centrifuge and high failure rate. SUMMARY

[0003] In view of the above deficiencies of the prior art, the present application provides a slurry concentration adjusting system and method for a settling-filtering centrifuge, which can adjust the optimal feeding concentration of the settling-filtering centrifuge in the high-concentration pipeline coal slurry dehydration system, has good solid-liquid separation effect, and improves the product quality.

[0004] The technical scheme provided by the present application is as follows: a slurry concentration adjusting system for a settling-filtering centrifuge, comprising a centrifuge feeding buffer tank, a settling-filtering centrifuge, and a circulating water pool. A first flow meter and a concentration meter are arranged on a feeding pipeline of the centrifuge feeding buffer tank. An outlet of the centrifuge feeding buffer tank is connected to an inlet of the settling-filtering centrifuge. An outlet of the circulating water pool is connected to the centrifuge feeding buffer tank through a circulating water pipeline. A second flow meter and an electric ball valve are arranged on the circulating water pipeline. Centrifugal liquid of the settling-filtering centrifuge is connected to a centrifugal liquid barrel through a pipeline. An outlet of the centrifugal liquid barrel is connected to an inlet of a thickener. An overflow port of the thickener is connected to an inlet of the circulating water pool.

[0005] Further, the feeding pipeline of the centrifuge feeding buffer tank is connected to a slurry storage tank. The coal slurry in the slurry storage tank 1 is fed to the centrifuge feeding buffer tank through a slurry feeding pump.

[0006] Further, the product after dehydration of the settling-filtering centrifuge is transferred to a product coal shed through a scraper conveyor.

[0007] Further, the outlet of the centrifugal liquid barrel is connected with the inlet of a centrifugal liquid pump, the outlet of the centrifugal liquid pump is connected with a thickener stable material barrel, and the outlet of the thickener stable material barrel is connected with the inlet of a thickener.

[0008] Further, the underflow of the thickener enters a fine particle filter press dewatering system through an underflow pump.

[0009] Further, the outlet of the circulating water pool is connected with the inlet of a dilution water pump, and the outlet of the dilution water pump is connected with a centrifuge feeding buffer box.

[0010] Further, the first flow meter, the concentration meter, the second flow meter, the electric ball valve and the pumps of the adjusting system are connected with a PLC control system.

[0011] The application provides another technical scheme: a method for adjusting the concentration of coal slurry fed into a sedimentation filtration type centrifuge, comprising the following steps:

[0012] (1) After the pipe-transported coal slurry reaches a terminal station, the coal slurry is stored in a slurry storage tank, and the coal slurry in the slurry storage tank is fed into a centrifuge feeding buffer box through a slurry feeding pump; a first flow meter and a concentration meter are installed on a feeding pipeline of the centrifuge feeding buffer box, and are used for monitoring the flow and the concentration of the coal slurry fed into the centrifuge feeding buffer box.

[0013] (2) The water used for adjusting the concentration of the coal slurry in the centrifuge feeding buffer box is from a circulating water pool, the water in the circulating water pool is fed into the centrifuge feeding buffer box through a dilution water pump, and a second flow meter and an electric ball valve are arranged on a water feeding pipeline.

[0014] (3) The product dewatered by the sedimentation filtration type centrifuge is transported to a product coal shed through a scraper conveyor, the sedimentation filtration type centrifugal liquid enters a centrifugal liquid barrel, and then is transported to a thickener stable material barrel through a centrifugal liquid pump, and then enters the thickener to be concentrated and clarified; the underflow of the thickener enters a fine particle filter press dewatering system through an underflow pump; and the overflow of the thickener finally returns to the circulating water pool, and part of the circulating water in the circulating water pool is used as dilution water, and the remaining part enters a waste water treatment station.

[0015] Further, the target concentration of the sedimentation filtration type centrifuge is calculated by the following formula:

[0016] ,

[0017] In the formula, is the feeding concentration measured by the concentration meter on the feeding pipeline of the centrifuge feeding buffer box, Q1 is the feeding coal slurry flow measured by the first flow meter on the feeding pipeline of the centrifuge feeding buffer box, and Q is the dilution water flow, and the following formula can be obtained from the above formula:

[0018] ,

[0019] The actual dilution water quantity is detected by the second flow meter arranged on the circulating water pipeline, the opening size of the electric ball valve on the circulating water pipeline is controlled, and the dilution water quantity and the required value are dynamically balanced.

[0020] The beneficial effects of the present application are:

[0021] (1) In view of the problem that the dehydration effect of the pipe-transported coal slurry is poor due to the high concentration of the pipe-transported coal slurry, the dilution and slurry adjustment link is added before the pipe-transported coal slurry enters the settling and filtering type centrifuge, so that the solid particles in the coal slurry are fully dispersed, which is beneficial to the solid-liquid separation of the coal slurry in the settling and filtering type centrifuge, and the product moisture is reduced.

[0022] (2) The concentrated water in the circulating water system is used as the dilution water source instead of clean water, so that the water consumption is reduced, the pressure of the waste water treatment system is reduced, and the energy consumption is reduced.

[0023] (3) The coal slurry concentration adjustment system can realize intelligent control, the data detected by the flow meter and the concentration meter installed on the feeding pipe of the centrifuge feeding buffer tank, the set target concentration value and the data detected by the flow meter installed on the dilution water pipeline are used to automatically adjust the opening size of the electric ball valve on the dilution water pipeline to adjust the dilution water quantity until the target value is reached. At the same time, the system can be automatically adjusted according to the changes of the pipe-transported coal slurry feeding quantity and the concentration, and human intervention is not required. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a process schematic diagram of the present application;

[0025] In the figure: 1 - slurry storage tank; 2 - slurry feeding pump; 3 - first flow meter; 4 - concentration meter; 5 - centrifuge feeding buffer tank; 6 - settling and filtering type centrifuge; 7 - centrifugal liquid barrel; 8 - centrifugal liquid pump; 9 - material stabilizing barrel; 10 - thickener; 11 - underflow pump; 12 - circulating water pool; 13 - dilution water pump; 14 - electric ball valve; 15 - second flow meter. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0027] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] like Figure 1 The system shown is a coal slurry concentration adjustment system for a sedimentation filter centrifuge feed, comprising a centrifuge feed buffer tank 5, a sedimentation filter centrifuge 6, and a circulating water tank 12. A first flow meter 3 and a concentration meter 4 are installed on the feed pipe of the centrifuge feed buffer tank 5. The outlet of the centrifuge feed buffer tank 5 is connected to the inlet of the sedimentation filter centrifuge 6. The outlet of the circulating water tank 12 is connected to the centrifuge feed buffer tank 5 via a circulating water pipeline. A second flow meter 15 and an electric ball valve 14 are installed on the circulating water pipeline. The centrifuged liquid from the sedimentation filter centrifuge 6 is connected to a centrifuged liquid tank 7 via a pipeline. The outlet of the centrifuged liquid tank 7 is connected to the inlet of a thickener 10. The overflow port of the thickener 10 is connected to the inlet of the circulating water tank 12.

[0030] The feed pipe of the centrifuge feed buffer tank 5 is connected to the slurry storage tank 1. The coal slurry in the storage tank 1 is transported to the centrifuge feed buffer tank by the feed pump 2. The dewatered product of the sedimentation filter centrifuge 6 is transferred to the product coal shed by the scraper conveyor.

[0031] The outlet of the centrifugal liquid tank 7 is connected to the inlet of the centrifugal liquid pump 8, the outlet of the centrifugal liquid pump 8 is connected to the thickener stabilizing tank 9, and the outlet of the thickener stabilizing tank 9 is connected to the inlet of the thickener 10. The underflow from the thickener 10 enters the dewatering system of the fine particle filter press via the underflow pump 11.

[0032] The outlet of the circulating water pool 12 is connected with the inlet of the dilution water pump 13, and the outlet of the dilution water pump 13 is connected to the centrifuge feed buffer tank 5. The first flow meter 3, the concentration meter 4, the second flow meter 15, the electric ball valve 14 and the pumps of the regulating system are connected with the PLC control system.

[0033] After the pipe coal slurry reaches the terminal station, it is stored in the slurry storage tank 1. The coal slurry in the slurry storage tank 1 is fed into the centrifuge feed buffer tank 5 through the slurry feeding pump 2. The first flow meter 3 and the concentration meter 4 are installed on the centrifuge feed buffer tank feed pipeline for monitoring the flow and concentration of the coal slurry fed into the centrifuge feed buffer tank 5. The water for adjusting the concentration of the coal slurry in the centrifuge feed buffer tank 5 comes from the circulating water pool 12. The water in the circulating water pool 12 is fed into the centrifuge feed buffer tank 5 through the dilution water pump 13. The second flow meter 15 and the electric ball valve 14 are arranged on the feed pipeline. The dewatered product of the settling and filtering type centrifuge 6 is transferred to the product coal shed through the scraper conveyor. The settling and filtering type centrifuge liquid enters the centrifuge liquid barrel 7, and then is transported to the thickener stable tank 9 through the centrifuge liquid pump 8 for buffering, and then enters the thickener 10 for concentration and clarification. The underflow of the thickener 10 enters the fine particle filter press dewatering system through the underflow pump 11. The overflow of the thickener 10 finally returns to the circulating water pool 12. Part of the circulating water in the circulating water pool 12 is used as dilution water, and the remaining part enters the wastewater treatment station.

[0034] The dilution to the target concentration is The target concentration is calculated by the following formula:

[0035]

[0036] In the formula, is the feed concentration measured by the concentration meter 4 on the centrifuge feed buffer tank feed pipeline, Q1 is the feed coal slurry flow measured by the flow meter 3 on the centrifuge feed buffer tank feed pipeline, and Q is the dilution water flow. From the above formula, we can get:

[0037]

[0038] Therefore, according to the data measured by the flow meter 3 and the concentration meter 4 on the centrifuge feed buffer tank feed pipeline and the target concentration to be diluted, the actual dilution water amount can be detected by the second flow meter 15 arranged on the circulating water pipeline to control the opening size of the electric ball valve 14 on the circulating water pipeline, so that the dilution water flow and the required value reach dynamic balance.

[0039] When the coal slurry concentration of the feeding of the sedimentation filter centrifuge is 53%, the product moisture is high, through multiple test research, when the feeding concentration is about 40%, the dewatering effect of the sedimentation filter centrifuge is better, and the water content is below 22%. The application solves the technical problem of adjusting the best feeding concentration range of the sedimentation filter centrifuge in the high-concentration pipe-conveying coal slurry dewatering system.

[0040] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or replaced by the same, without departing from the spirit and scope of the present application.

Claims

1. A coal slurry concentration adjustment system for a sedimentation filtration centrifuge feed, characterized in that, The centrifuge feed buffer tank (5) is connected with the slurry storage tank (1), and the coal slurry in the slurry storage tank (1) is transported to the centrifuge feed buffer tank by the slurry feeding pump (2).

2. The feed coal slurry concentration regulating system of a sedimentation filtration type centrifuge according to claim 1, characterized in that, The product after dehydration of the sedimentation filter centrifuge (6) is transferred to the product coal shed by the scraper conveyor.

3. The coal slurry concentration regulating system of the settling filtration type centrifuge feed according to claim 1, characterized in that, The outlet of the centrifugal liquid barrel (7) is connected with the inlet of the centrifugal liquid pump (8), and the outlet of the centrifugal liquid pump (8) is connected to the thickener stable barrel (9), and the outlet of the thickener stable barrel (9) is connected with the inlet of the thickener (10).

4. The feed coal slurry concentration regulating system of a settling filtration type centrifuge according to claim 1, wherein The underflow of the thickener (10) enters the fine particle filter press dehydration system through the underflow pump (11).

5. A feed coal slurry concentration regulating system for a settling filtration type centrifuge according to claim 4, wherein The outlet of the circulating water pool (12) is connected with the inlet of the dilution water pump (13), and the outlet of the dilution water pump (13) is connected to the centrifuge feed buffer tank (5).

6. A feed coal slurry concentration regulating system for a settling filtration type centrifuge according to claim 1, wherein The first flow meter (3), the concentration meter (4), the second flow meter (15), the electric ball valve (14) and each pump of the adjusting system are connected with the PLC control system.

7. A feed slurry concentration adjustment system for a decanter centrifuge according to any one of claims 1 to 6, characterized in that, The method comprises the following steps:

8. A method of adjusting the concentration of coal slurry fed into a settling filter type centrifuge, characterized by, (1) After the pipe-transported coal slurry reaches the terminal station, it is stored in the slurry storage tank (1), and the coal slurry in the slurry storage tank (1) is fed into the centrifuge feed buffer tank (5) by the slurry feeding pump (2), and the first flow meter (3) and the concentration meter (4) are installed on the feed pipe of the centrifuge feed buffer tank (5) for monitoring the flow and concentration of the coal slurry fed into the centrifuge feed buffer tank (5); (2) The water for adjusting the concentration of the coal slurry in the centrifuge feed buffer tank (5) comes from the circulating water pool (12), and the water in the circulating water pool (12) is fed into the centrifuge feed buffer tank (5) by the dilution water pump (13), and the second flow meter (15) and the electric ball valve (14) are arranged on the feed pipe; (3) The product after dehydration of the sedimentation filter centrifuge (6) is transferred to the product coal shed by the scraper conveyor, and the sedimentation filter centrifugal liquid enters the centrifugal liquid barrel (7), and then is transported to the thickener stable barrel (9) by the centrifugal liquid pump (8) after buffering, and then enters the thickener (10) to be concentrated and clarified, and the underflow of the thickener (10) enters the fine particle filter press dehydration system through the underflow pump (11), and the overflow of the thickener (10) finally returns to the circulating water pool (12), and part of the circulating water in the circulating water pool (12) is used as dilution water, and the remaining part enters the wastewater treatment station. ​ 9. A method for adjusting the concentration of coal slurry fed into a sedimentation filtration centrifuge according to claim 8, characterized in that, Target concentration for a decanter centrifuge Calculated from the formula: ， wherein Q1 is the feed slurry flow rate measured by the first flow meter on the feed pipe of the centrifuge feed buffer tank, and Q is the dilution water flow rate. ， The actual dilution water quantity is detected by the second flow meter arranged on the circulating water pipeline, and the opening size of the electric ball valve on the circulating water pipeline is controlled, so that the dilution water flow and the required value reach dynamic balance.

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