CN114100204A - Deep cone thickener underflow energy-saving conveying system and using method thereof - Google Patents
Deep cone thickener underflow energy-saving conveying system and using method thereof Download PDFInfo
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- CN114100204A CN114100204A CN202111408244.XA CN202111408244A CN114100204A CN 114100204 A CN114100204 A CN 114100204A CN 202111408244 A CN202111408244 A CN 202111408244A CN 114100204 A CN114100204 A CN 114100204A
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- B01D21/01—Separation of suspended solid particles from liquids by sedimentation using flocculating agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Abstract
The invention provides an energy-saving underflow conveying system of a deep cone thickener, which comprises the deep cone thickener, a stirring device and a pipeline conveying device for conveying the underflow from the deep cone thickener to the stirring device, wherein the pipeline conveying device is in signal connection with a PLC central control system; the pipeline conveying device comprises a pressure water supply system, a gravity flow pipeline system, a pumping pipeline system and a slurry pump for supplying energy to the underflow; the pressure water supply system, the gravity flow pipeline system and the pumping pipeline system are communicated with each other; the slurry pump is positioned on one side of the pumping pipeline system and serves as initial underflow slurry energy supply equipment. By switching of the valve group and supply of pressure water, the underflow is fully filled in the conveying pipeline under the driving action of the slurry pump and then is switched to the gravity flow mode by the pumping mode, so that the use of the slurry pump in the conveying process is reduced, and the energy consumption and the cost in the mine filling process are effectively reduced; the pipeline conveying process is controlled through PLC programming, the automation degree is high, and the preparation quality and efficiency of the filling slurry are improved.
Description
Technical Field
The invention relates to the field of preparation of filling slurry in mine filling, in particular to an energy-saving underflow conveying system of a deep cone thickener and a using method thereof.
Background
The deep cone thickener is a tailing thickening enrichment device commonly used in the field of mine filling at present, low-concentration total tailings of a selecting factory enter the deep cone thickener, flocculation sedimentation and enrichment are carried out to form high-concentration mortar at the lower part, an underflow barrel and a discharge port are arranged at the bottom of the thickener, and the underflow is conveyed to a stirring device in a preparation factory building through a pipeline to complete tailing feeding.
The deep cone thickener and the preparation plant are generally arranged at the same elevation, the stirring device in the preparation plant is usually a section of vertical strong stirring tank or a section of horizontal stirrer, and in order to ensure that the prepared filling slurry in the stirring device can smoothly flow into a filling drill hole or a feeding hopper of a filling pump, the stirring device can be erected on a higher platform so as to provide sufficient height difference. And the underflow barrel of the deep cone thickener is located on the ground, so that underflow of the thickener needs to be conveyed to a feeding hole of stirring equipment at a relatively higher position from a lower position, and the underflow cannot automatically flow to the stirring equipment at the higher position through a pipeline after a sand discharging hole of the underflow is opened. The conventional solution is to design a slurry pump with appropriate flow and lift, and pump the underflow of the thickener to a stirring device through the slurry pump to complete tailing feeding, and the use of the slurry pump effectively solves the problem of conveying the underflow of the thickener.
Through tail mortar fluidity tests and practical application, the discovery shows that the underflow of a thickener has high cohesive force in a static state due to high concentration, and the underflow mortar can not flow smoothly in a pipeline after the underflow sand valve is opened; when the underflow mortar is in a disturbed state, the cohesive force of the underflow mortar is quickly reduced, in addition, the relative height difference between the thickener and the feeding hole of the stirring equipment is larger, the rake frame of the thickener rotates to enable the mortar inside to have certain fluidity, and when the mortar starts to flow at the underflow barrel, the potential energy can maintain the conveying of the underflow in the pipeline. Due to the height difference between the thickener and the stirring equipment, when the pipeline is filled with mortar, the potential energy of the mortar can overcome the on-way resistance of the mortar in the pipeline, and the self-flowing conveying of the underflow is maintained. In the prior art, the underflow pump is usually added to the pipeline transportation to realize the transportation of the underflow of the thickener, and the slurry pump can disturb the underflow mortar in the thickener, reduce the cohesive force of the underflow mortar, and fill the pipeline with the underflow mortar through pressure transportation. However, the underflow slurry is continuously delivered and can wear the slurry pump, possibly becoming a failure point in the underflow delivery system. In addition, in the conveying process, the energy consumption of the slurry pump is large, and the cost in the mine filling process is increased.
In the prior art, the invention patent application with the publication number of CN 113513363 a discloses a fine-grained high-concentration tailing filling and thickening device, which comprises a tank part, a wind-water slurry making system, a bottom flow conveying system, an electric control system, a flocculant preparation and addition system and the like, wherein the wind-water slurry making system comprises an annular water pipe set and an annular gas pipe set, annular water pipes of all layers of the annular water pipe set and annular gas pipes of all layers of the annular gas pipe set are positioned at different height positions and distributed in an inverted cone shape, and a plurality of high-pressure rubber water (gas) spraying pipes, valves and external water (wind) slurry making nozzles are connected to the annular water pipes and the annular gas pipes of each layer; the annular water pipe is connected with the water supply and drainage main pipe, and the annular air pipe is connected with the air supply and exhaust main pipe. The bottom pulp discharge port of the groove body part is connected with the pulp conveying pipe through a slurry pump, so that the pulp enters the underflow conveying system. In the technical scheme, the whole underflow conveying process involves the use of a slurry pump, the underflow mortar is continuously conveyed, the underflow mortar can abrade the slurry pump, the energy consumption in the conveying process is large, and the cost in the mine filling process is increased.
In view of the above, there is a need to design an improved underflow energy-saving conveying system of a deep cone thickener to solve the above problems.
Disclosure of Invention
The invention aims to provide an energy-saving underflow energy-saving conveying system of a deep cone thickener and a using method of the energy-saving underflow conveying system of the deep cone thickener.
In order to realize the aim, the invention provides an energy-saving underflow conveying system of a deep cone thickener, which comprises the deep cone thickener, a stirring device and a pipeline conveying device for conveying underflow from the deep cone thickener to the stirring device, wherein the pipeline conveying device is in signal connection with a PLC (programmable logic controller) central control system in which a pipeline conveying flow is stored;
the pipeline conveying device comprises a pressure water supply system, a self-flowing pipeline system, a pumping pipeline system and a slurry pump serving as underflow mortar initial energy supply equipment;
the pressure water supply system, the gravity flow pipeline system and the pumping pipeline system are communicated with each other;
the slurry pump is positioned on one side of the pumping pipeline system and serves as underflow mortar initial energy supply equipment.
Further, the pumping pipeline system comprises a pumping branch pipe, and a fourth electric knife gate valve and a fifth electric knife gate valve which are arranged on the pumping branch pipe.
Further, the pumping branch pipe comprises a horizontal section along the flow direction of the underflow mortar and a vertical section perpendicular to the flow direction of the underflow mortar, and the slurry pump is arranged at the intersection of the horizontal section and the vertical section of the pumping branch pipe.
Furthermore, the artesian pipeline system comprises an artesian branch pipe, a second electric knife gate valve, an automatic exhaust valve and a third electric knife gate valve which are arranged on the artesian branch pipe, wherein the artesian branch pipe comprises a horizontal section parallel to the flow direction of the underflow mortar and a vertical section perpendicular to the flow direction of the underflow mortar.
Further, the tail end of the vertical end of the pumping branch pipe and the tail end of the horizontal end of the self-flowing branch pipe are converged and extend to the feeding hole of the stirring equipment together.
Furthermore, one end of the pressure water supply system is connected with a pipeline conveying system, the other end of the pressure water supply system is connected with the gravity flow pipeline system, and the pressure water supply system comprises a production water pipe, a first check valve, a first electric ball valve, a second check valve and a production water inlet, wherein the first check valve, the first electric ball valve, the second electric ball valve and the second check valve are arranged on the production water pipe, and the production water inlet is arranged between the first electric ball valve and the second electric ball valve.
The invention also provides a use method of the deep cone thickener underflow energy-saving conveying system for preparing filling slurry, which comprises the following steps:
s1, preparing for starting;
opening a first electric ball valve of a production water supply system, enabling production water to enter an underflow conveying pipe through a first check valve, keeping the first electric knife gate valve, the second electric knife gate valve and the third electric knife gate valve closed in the process, keeping the fourth electric knife gate valve and the fifth electric knife gate valve open, and enabling the production water to flow into stirring equipment after passing through a pumping branch pipe;
s2, conveying the underflow mortar;
opening the first electric knife gate valve, opening a sand discharge port to enable the deep cone thickener to start underflow sand supply, opening a slurry pump to enable the pipeline to be full of underflow mortar, and starting underflow pumping; then, the production water enters the gravity flow branch pipe 241, the air in the gravity flow branch pipe 241 is discharged by the pressure generated by the production water, meanwhile, the slurry pump 26 is closed, the conveying mode of the underflow mortar is switched from the conveying of the pumping branch pipe 251 to the conveying of the gravity flow branch pipe 241, and the underflow mortar is conveyed from the deep cone thickener 10 to the stirring device 30;
s3, shutdown;
when the filling preparation work is finished, a second electric ball valve in a pressure water supply system is started, the first electric knife gate valve and the second electric knife gate valve are closed, the deep cone thickener stops discharging, the gravity flow branch pipe is flushed by the pressure of production water until clear water appears at the feed inlet of the stirring equipment; when clear water appears at the feed inlet of the stirring equipment, closing a second electric ball valve in the pressure water supply system, opening a first electric ball valve, and enabling the produced water to enter the underflow conveying pipeline through the first check valve; then, closing the third electric knife gate valve, opening a fourth electric knife gate valve, the fifth electric knife gate valve and the slurry pump, and washing the underflow conveying pipeline and the pumping branch pipe until clear water appears at the feed inlet of the stirring equipment; and when clear water appears at the feed inlet of the stirring equipment, the first electric ball valve and the slurry pump in the pressure water supply system are closed, and the cleaning work of the underflow conveying pipe network is completed.
Further, the step S2 includes the following steps:
s21, pumping and conveying;
opening the first electric knife gate valve and the slurry pump, enabling the underflow mortar to flow out of the sand discharge port, closing the first electric ball valve and stopping supplying water into the conveying pipeline; the underflow mortar is conveyed by the pressurization of the slurry pump, passes through the pumping branch pipe and enters a feeding hole of the stirring equipment; then, the second electric ball valve of the pressure water supply system is opened, the produced water enters the gravity flow branch pipe through the first check valve, the air in the gravity flow branch pipe is discharged through the automatic exhaust valve under the pressure generated by the produced water, and the gravity flow branch pipe is filled with water;
s22, self-stream conveying;
closing the slurry pump, the fourth electric knife gate valve and the fifth electric knife gate valve, opening the second electric knife gate valve and the third electric knife gate valve, and keeping opening the second electric ball valve in the pressure water supply system; when the underflow feed flow is stable, closing the second electric ball valve in the pressure water supply system, and stopping supplying water to the gravity flow branch pipe; the underflow of the thickener continuously feeds into the stirring equipment through the gravity flow branch pipe.
Further, the whole operation process is controlled by a PLC central control system programmed into the filling system.
Further, the bottom of the deep cone thickener is positioned below the horizontal plane where the feed inlet of the stirring device is positioned.
The invention has the beneficial effects that:
the energy-saving underflow conveying system of the deep cone thickener provided by the invention fully utilizes the potential energy of the underflow mortar in the deep cone thickener, and after the underflow mortar is fully filled in a pipeline under the pressure conveying of a slurry pump, the underflow mortar is converted from pumping to self-flowing conveying by switching of a valve group and the supply of pressure water by utilizing the principle of a communicating vessel, so that the slurry pump is stopped in the normal process of supplying the underflow mortar, the energy consumption is reduced, meanwhile, the underflow mortar does not pass through the slurry pump, the abrasion speed of wearing parts such as the slurry pump and the like can be reduced, and the service life of equipment is prolonged; the pipeline conveying device is in signal connection with the PLC central control system in which the pipeline conveying flow is controlled, so that a valve group and a water supply network in the pipeline conveying system can be controlled, the automation degree is high, the preparation quality and efficiency of the filling slurry are improved, the labor intensity of workers is reduced, and pipe blockage accidents possibly caused by wrong operation are effectively avoided; switching the underflow mortar from the pumping branch to the gravity flow branch by switching the valve group and supplying pressure water; after the gravity flow branch is filled with water and exhausted, the principle of the communicating vessel and the potential energy of the mortar of the thickener ensure continuous feeding.
Drawings
FIG. 1 is a schematic structural view of an energy-saving underflow delivery system of a deep cone thickener according to the present invention;
FIG. 2 is a flow path diagram of underflow mortar in the pumping and conveying process when the underflow energy-saving conveying system of the deep cone thickener of the invention is applied to prepare filling slurry;
FIG. 3 is a flow path diagram of the underflow mortar during the self-flowing transportation process when the underflow energy-saving transportation system of the deep cone thickener of the invention is applied to prepare the filling slurry;
the reference numbers are as follows:
100. the underflow energy-saving conveying system of the deep cone thickener; 10. a deep cone thickener; 21. placing a sand port; 22. a first electric knife gate valve; 23. a pressurized water supply system; 231. a pressurized water supply system; 232. a first electrically powered ball valve; 233. a second electrically operated ball valve; 234. a second check valve; 235. a production water inlet; 24. a gravity flow piping system; 241. a gravity flow branch pipe; 242. a second electric knife gate valve; 243. an automatic exhaust valve; 244. a third electric knife gate valve; 25. a pumping piping system; 251. a pumping branch pipe; 252. a fourth electric knife gate valve; 253. a fifth electric knife gate valve; 26. a slurry pump; 30. and (4) stirring equipment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Referring to fig. 1, the energy-saving underflow conveying system 100 of the deep cone thickener provided by the present invention includes a deep cone thickener 10, a stirring device 30, and a pipe conveying device for conveying underflow mortar from the deep cone thickener 10 to the stirring device 30. The pipeline conveying device comprises a pressure water supply system 23, an artesian pipeline system 24, a pumping pipeline system 25 and a slurry pump 26 as an underflow mortar initial energy supply device, wherein the pressure water supply system 23, the artesian pipeline system 24 and the pumping pipeline system 25 are communicated with each other. A sand outlet 21 is arranged on the pipeline close to the bottom of the deep cone thickener 10 for the underflow mortar to flow out. Along the flow direction of the underflow mortar, a first electric knife gate valve 22 close to the sand discharge port 21 is arranged, a conveying pipeline behind the first electric knife gate valve 22 starts to branch, one branch enters a pressure water supply system 23 in the vertical direction, the other branch is still arranged along the flow direction of the underflow mortar and branches into a gravity flow pipeline system 24 and a pumping pipeline system 25, and the tail end of the pressure water supply system 23 is converged with the middle end of the gravity flow pipeline system 24. The pressure water supply system 23 comprises a production water pipe connected with a conveying pipeline in the vertical direction, a first check valve 231, a first electric ball valve 232, a second electric ball valve 233 and a second check valve 234 are sequentially arranged on the water pipe, a production water inlet 235 is arranged between the first electric ball valve 232 and the second electric ball valve 233, and the production water pipe at the tail end of the second check valve 234 enters the gravity flow pipeline system 24; the gravity flow pipeline system 24 comprises a gravity flow branch pipe 241, a second electric knife gate valve 242, an automatic exhaust valve 243 and a third electric knife gate valve 244 which are sequentially arranged on the gravity flow branch pipe 241, wherein the gravity flow branch pipe 241 comprises a horizontal section parallel to the flow direction of the underflow mortar and a vertical section perpendicular to the flow direction of the underflow mortar; the pumping pipeline system 25 comprises a pumping branch pipe 251, and a fourth electric knife gate valve 252 and a fifth electric knife gate valve 253 which are sequentially arranged on the pumping branch pipe 251, wherein the pumping branch pipe 251 comprises a horizontal section along the flow direction of the underflow mortar and a vertical section perpendicular to the flow direction of the underflow mortar, a slurry pump 26 is arranged at the intersection of the horizontal section and the vertical section of the pumping branch pipe 251 to supply power to the underflow mortar in the conveying pipeline, so that the underflow mortar is stirred and moves in the conveying pipeline, and the vertical end tail end of the pumping branch pipe 251 is merged with the horizontal end tail end of the gravity branch pipe 241 and extends to the feed inlet of the stirring device 30.
The invention also provides a use method of the deep cone thickener underflow energy-saving conveying system 100 for preparing filling slurry, which comprises the following steps:
s1, preparing for starting;
the first electric ball valve 232 of the production water supply system is opened, the production water enters the underflow delivery pipe through the first check valve 231, in the process, the first electric knife gate valve 22, the second electric knife gate valve 242 and the third electric knife gate valve 244 are kept closed, the fourth electric knife gate valve 252 and the fifth electric knife gate valve 253 are kept opened, and the production water flows into the stirring device 30 after passing through the pumping branch pipe 251. The process aims at flushing and lubricating the underflow conveying pipeline and cleaning tailing possibly remaining in the pipeline;
s2, conveying the underflow mortar;
starting a first electric knife gate valve 22 to enable the deep cone thickener 10 to start underflow sand supply, starting a slurry pump 26 to enable the pipeline to be filled with underflow mortar, and starting underflow pumping; then, the production water enters the gravity flow branch pipe 241, the air in the gravity flow branch pipe 241 is discharged by the pressure generated by the production water, meanwhile, the slurry pump 26 is closed, the conveying mode of the underflow mortar is switched from the conveying of the pumping branch pipe 251 to the conveying of the gravity flow branch pipe 241, and the underflow mortar is conveyed from the deep cone thickener 10 to the stirring device 30;
s21, pumping and conveying;
opening the first electric knife gate valve 22 and the slurry pump 26, allowing the underflow mortar to flow out of the sand discharge port 21, closing the first electric ball valve 232, and stopping supplying water into the conveying pipeline; the underflow mortar is pressurized and conveyed by the slurry pump 26, passes through the pumping branch pipe 251 and enters the feeding hole of the stirring equipment 30; the pumping is kept for a period of time, so that the feed flow of the underflow mortar is stable, and the flow path of the underflow mortar in the process is shown in figure 2;
the second electric ball valve 233 of the pressure water supply system 23 is opened, and the produced water enters the gravity flow branch pipe 241 through the first check valve 231; the pressure generated by the production water enables the air in the gravity flow branch pipe 241 to be discharged through the automatic exhaust valve 243, and the gravity flow branch pipe 241 is filled with water;
s22, self-stream conveying;
closing the slurry pump 26, the fourth electric knife gate valve 252 and the fifth electric knife gate valve 253, opening the second electric knife gate valve 242 and the third electric knife gate valve 244, and keeping opening the second electric ball valve 233 in the pressure water supply system 23, wherein the underflow mortar keeps supplying to the stirring equipment due to the communicating vessel principle and the potential energy of the mortar in the thickener; when the underflow feed flow is stable, the second electric ball valve 233 in the pressure water supply system 23 is closed, and the water supply to the gravity flow branch pipe 241 is stopped; the underflow of the thickener is continuously fed into the stirring device through the gravity branch pipe 241, and the flow path of the underflow mortar in the process is shown in FIG. 3; in the process, the underflow mortar does not pass through the slurry pump 26, the energy consumption of underflow conveying is avoided, the abrasion to the slurry pump is reduced, and the aim of saving energy is fulfilled;
s3, shutdown;
when the filling preparation work is finished, the second electric ball valve 233 in the pressure water supply system 23 is opened, the first electric knife gate valve 22 and the second electric knife gate valve 242 are closed, the thickener stops discharging, the gravity flow branch pipe 241 is flushed by the pressure of the production water until clear water appears at the feed port of the stirring device 30; when clear water appears at the feed inlet of the stirring device 30, the second electric ball valve 233 in the pressure water supply system 23 is closed, the first electric ball valve 232 is opened, and the produced water enters the underflow conveying pipeline through the first check valve 231; then, the third electric knife gate valve 244 is closed, the fourth electric knife gate valve 252, the fifth electric knife gate valve 253 and the slurry pump 26 are opened, and the underflow conveying pipeline and the pumping branch pipe 252 are washed until clear water appears at the feed inlet of the stirring device 30; when clean water appears at the feed inlet of the stirring device 30, the first electric ball valve 232 and the slurry pump 26 in the pressure water supply system 23 are closed, and the cleaning work of the underflow conveying pipe network is completed.
In the whole process, the opening and closing of the electric valve and the slurry pump 26, the starting operation process and the closing process can be controlled by a PLC central control system written in the filling system through programming, so that the remote operation and the automatic control of the conveying process of the underflow mortar are facilitated, the labor intensity of workers is reduced, the efficiency is improved, and pipe blockage accidents possibly caused by wrong operation are eliminated.
Example 1
A multi-metal ore of the inner Mongolia adopts a sublevel rock drilling stage subsequent filling mining method, the volume of a single stope dead zone is large, and the single filling amount is required to be large. The filling process is that after the tailing is treated by the high-efficiency deep cone thickener, high-concentration underflow mortar is formed, the underflow is pumped to a vertical strong stirring tank arranged on the second floor of a preparation factory building through a slurry pump, and the annual filling amount of a mine reaches 150 ten thousand meters3The slurry pump needs to operate at full load in the production process, the 45kW motor consumes more energy, and the wearing parts of the slurry pump are frequently replacedFrequently, accessories such as an impeller need to be replaced once in 3 months on average, the replacement frequency of sealing elements such as packing is higher, and certain influence is caused on the smoothness of production. According to the invention, a underflow conveying system of the thickener is transformed, a corresponding gravity branch is arranged, and by utilizing the principle of a communicating vessel, through the switching of a valve group and the supply of pressure water, after a slurry pump is used for filling the pipeline with underflow mortar, the potential energy of the mortar in the thickener is used for continuously feeding, and the underflow conveying does not pass through the slurry pump any more. Compared with the 3 months, the service life of the easily damaged part of the slurry pump is prolonged to 1.5 years, the replacement frequency of the sealing part is greatly reduced, and a large amount of energy consumption is saved.
Example 2
The old dead zone is treated by the copper mine in Sichuan by adopting a full-tailing cemented filling mode, the volume of the dead zone is large, and the single filling time is long. The design is that a deep cone thickener supplies high-concentration tailings, the continuous sand supply is needed to a two-stage continuous horizontal stirrer, and filling slurry prepared by the stirrer automatically flows into a filling pump and then is pumped to an underground dead zone. About 40 ten thousand meters of old goaf is treated in mine year3Normal annual stoping and filling dead zone volume of 20 ten thousand meters3Thus, the annual preparation amount of the filling slurry is about 60 ten thousand m3And the slurry pump continuously supplies sand during filling operation, a 30kW motor consumes more energy, wearing parts need to be replaced once in 6 months on average, and sealing parts such as packing are replaced more frequently, so that certain influence is caused on production. According to the invention, a underflow conveying system of the thickener is transformed, a corresponding gravity branch is arranged, and by utilizing the principle of a communicating vessel, through the switching of a valve group and the supply of pressure water, after a slurry pump is used for filling the pipeline with underflow mortar, the potential energy of the mortar in the thickener is used for continuously feeding, and the underflow conveying does not pass through the slurry pump any more. The consumption speed of easily damaged parts of the slurry pump is greatly reduced, and the operation cost and a large amount of energy consumption are saved.
In summary, the energy-saving underflow conveying system 100 of the deep cone thickener provided by the invention fully utilizes the potential energy of the mortar in the deep cone thickener, and after the underflow mortar is fully filled in a pipeline under the pressure conveying of the slurry pump 26, the underflow mortar is converted from pumping to self-flowing conveying by switching of the valve group and the supply of pressure water by utilizing the principle of the communicating vessel, so that the slurry pump 26 is stopped in the normal process of supplying the underflow mortar, the energy consumption is reduced, meanwhile, the underflow mortar does not pass through the slurry pump, the abrasion speed of wearing parts such as the slurry pump and the like is reduced, and the service life of equipment is prolonged; the PLC central control system is used for controlling a valve group and a water supply network in the conveying system, so that the automation degree is high, the preparation quality and efficiency of the prepared filling slurry are improved, the labor intensity of workers is reduced, and pipe blockage accidents possibly caused by wrong operation are effectively avoided; switching the underflow mortar pumping branch to the gravity flow branch through switching of the valve group and supply of pressure water; after the gravity flow branch is filled with water and exhausted, the principle of the communicating vessel and the potential energy of the mortar of the thickener ensure continuous feeding.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (10)
1. The energy-saving underflow conveying system of the deep cone thickener is characterized by comprising a deep cone thickener (10), a stirring device (30) and a pipeline conveying device for conveying underflow mortar from the deep cone thickener (10) to the stirring device (30), wherein the pipeline conveying device is in signal connection with a PLC (programmable logic controller) central control system in which a pipeline conveying flow is stored;
the pipeline conveying device comprises a pressure water supply system (23), a gravity flow pipeline system (24), a pumping pipeline system (25) and a slurry pump (26) serving as an initial underflow mortar energy supply device;
the pressure water supply system (23), the gravity flow pipeline system (24) and the pumping pipeline system (25) are communicated with each other;
the slurry pump (26) is located on one side of the pumping pipe system (25) and serves as an underflow mortar initial energy supply device.
2. The deep cone thickener underflow energy saving delivery system according to claim 1, wherein said pumping pipe system (25) comprises a pumping branch pipe (251), a fourth electric knife gate valve (252) and a fifth electric knife gate valve (253) provided on said pumping branch pipe (251).
3. The energy-saving underflow conveying system of a deep cone thickener according to claim 2, wherein said pumping branch pipe (251) comprises a horizontal section along the flow direction of the underflow mortar and a vertical section perpendicular to the flow direction of the underflow mortar, and said slurry pump (26) is arranged at the intersection of the horizontal section and the vertical section of said pumping branch pipe (251).
4. The deep cone thickener underflow energy saving delivery system according to claim 1, wherein the gravity flow pipe system (24) comprises a gravity flow branch pipe (241), a second electric knife gate valve (242), an automatic exhaust valve (243) and a third electric knife gate valve (244) which are arranged on the gravity flow branch pipe (241), and the gravity flow branch pipe (241) comprises a horizontal section parallel to the flow direction of the underflow mortar and a vertical section perpendicular to the flow direction of the underflow mortar.
5. The energy-saving underflow delivery system according to claim 4, wherein the vertical end of said pumping branch pipe (251) is merged with the horizontal end of said gravity flow branch pipe (241) and extends to the feed inlet of said stirring device (30).
6. The energy-saving underflow delivery system according to claim 1, wherein said pressurized water supply system (23) is connected to a pipeline system at one end and to said gravity flow pipeline system (24) at the other end, said pressurized water supply system (23) comprising a production water pipe, a first check valve (231), a first electric ball valve (232), a second electric ball valve (233) and a second check valve (234) disposed on said production water pipe, and a production water inlet (235) disposed between said first electric ball valve (232) and said second electric ball valve (233).
7. Use of the deep cone thickener underflow energy efficient transfer system according to any of claims 1 to 6 for the preparation of a filling slurry, characterized by the steps of:
s1, preparing for starting;
opening a first electric ball valve (232) of a production water supply system, enabling production water to enter an underflow conveying pipe through a first check valve (231), wherein the first electric knife gate valve (22), the second electric knife gate valve (242) and the third electric knife gate valve (244) are kept closed, the fourth electric knife gate valve (252) and the fifth electric knife gate valve (253) are kept open, and enabling the production water to flow into the stirring equipment (30) after passing through a pumping branch pipe (251);
s2, conveying the underflow mortar;
opening the first electric knife gate valve (22), opening a sand discharge port (21) to enable the deep cone thickener (10) to start underflow sand supply, opening a slurry pump (26) to enable the pipeline to be filled with underflow mortar, and starting underflow pumping; then, the production water enters the gravity branch pipe (241), the air in the gravity branch pipe (241) is discharged by using the pressure generated by the production water, meanwhile, the slurry pump (26) is closed, the conveying mode of the underflow mortar is switched from the conveying of the pumping branch pipe (251) to the conveying of the gravity branch pipe (241), and the underflow mortar is conveyed from the deep cone thickener (10) to the stirring device (30);
s3, shutdown;
when the filling preparation work is finished, a second electric ball valve (233) in a pressure water supply system (23) is opened, the first electric knife gate valve (22) and the second electric knife gate valve (242) are closed, the deep cone thickener (10) stops discharging, and the gravity flow branch pipe (241) is flushed by the pressure of production water until clear water appears at the feed inlet of the stirring equipment (30); when clear water appears at the feed inlet of the stirring equipment (30), closing a second electric ball valve (233) in the pressure water supply system (23), opening a first electric ball valve (232), and enabling the produced water to enter an underflow conveying pipeline through a first check valve (231); then, closing the third electric knife gate valve (244), opening a fourth electric knife gate valve (252), a fifth electric knife gate valve (253) and the slurry pump (26), and flushing the underflow conveying pipeline and the pumping branch pipe (252) until clear water appears at the feeding hole of the stirring equipment (30); when clear water appears at the feed inlet of the stirring equipment (30), the first electric ball valve (232) and the slurry pump (26) in the pressure water supply system (23) are closed, and the cleaning work of the underflow conveying pipe network is completed.
8. Use of the deep cone thickener underflow energy efficient transfer system according to claim 7 for the preparation of a filling slurry, wherein said step S2 comprises the steps of:
s21, pumping and conveying;
the first electric knife gate valve (22) and the slurry pump (26) are opened, the underflow mortar flows out of the sand discharge port (21), the first electric ball valve (232) is closed, and water supply into a conveying pipeline is stopped; the underflow mortar is conveyed by the pressurization of the slurry pump (26), passes through the pumping branch pipe (251) and enters the feeding hole of the stirring equipment (30); then, the second electric ball valve (233) of the pressure water supply system (23) is opened, the produced water enters the gravity branch pipe (241) through the first check valve (231), the air in the gravity branch pipe (241) is discharged through an automatic exhaust valve (243) by the pressure generated by the produced water, and the gravity branch pipe (241) is filled with water;
s22, self-stream conveying;
closing the slurry pump (26), the fourth electric knife gate valve (252) and the fifth electric knife gate valve (253), opening the second electric knife gate valve (242) and the third electric knife gate valve (244), and keeping opening the second electric ball valve (233) in the pressure water supply system (23); when the underflow feed flow is stable, closing the second electric ball valve (233) in the pressure water supply system (23) and stopping supplying water to the gravity branch pipe (241); the underflow of the thickener will continue to feed the stirring device through the gravity branch (241).
9. The energy-saving underflow delivery system according to claim 7 wherein the entire operation is controlled by a PLC central control system programmed into the charging system.
10. The energy-saving underflow delivery system according to claim 1, wherein the bottom of said deep cone thickener (10) is located below the level of the inlet of said agitator (30).
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| WO2024113561A1 (en) * | 2022-11-30 | 2024-06-06 | 中冶北方（大连）工程技术有限公司 | Filling slurry transport system and control method therefor |
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