Industrial test system for simulating long-distance pipeline transportation of slurry

Abstract

The invention provides an industrial test system for simulating long-distance pipeline conveying of slurry, which comprises a feeding system, a slurry making system, a pumping system, a ring pipe system, a dehydration system, a water loss pipeline, a waste slurry treatment system and a control system, the feeding system is used for conveying materials to the slurry making system, the slurry making system is used for preparing material particles into slurry and conveying the slurry to the pumping system, and the ring pipe system is used for conveying the slurry to the ring pipe system. The pumping system conveys slurry to the annular pipe system through a slurry pump, the annular pipe system comprises three pipelines, the middle sections of the pipelines are further provided with water loss pipelines used for simulating the slurry water loss condition, the annular pipe system is further connected with a dewatering system, and after simulation is finished, materials are recycled after being dewatered through the dewatering system. All the systems operate in a linkage mode and are controlled through a control system, and the control system is specifically a ShenWei SCADA system. The linkage device provided by the invention can be used for simulating safe and stable transportation under the conditions of pipeline transportation and working condition change, and provides theoretical analysis and design basis for a slurry transportation technology.

Description

Technical Field

[0001] The invention belongs to the technical field of long-distance pipeline transportation devices, and in particular relates to an industrialized test system for simulating long-distance pipeline transportation of slurry. Background Art

[0002] Pipeline slurry transportation uses water as a carrier, and after crushing and grinding, it is made into a slurry with a suitable particle size distribution and concentration, and then transported to the end user through a pipeline via a high-pressure pump. After terminal processing, it can meet the requirements of different types of users. In addition to being safe and reliable, pipelines also need to have considerable economic benefits and market competitiveness.

[0003] Long-distance pipeline transportation of slurry may cause sudden leakage of the pipeline. If a leakage accident occurs, it may cause environmental pollution and safety accidents. The pipeline leakage is forced to stop and restart with slurry. There are three stages in total. The first stage is to complete the repair work such as welding of the leaking pipeline. The second stage is to clear and clean the residual slurry blockage in the pipe section. The third stage is to stop and restart between stations to complete the slurry transportation between stations. In theory, the slurry truck cannot be stopped for more than 72 hours, so it is crucial to promptly discover and deal with the leakage problem of long-distance pipeline transportation of slurry.

[0004] Therefore, in order to further study the startup residence time after slurry loses water, the pipeline abrasion rate under different working conditions, the operating conditions of different pipe diameters and the operating conditions of different laying angles, it is urgent to develop a linkage process system that can simulate the long-distance pipeline transportation operation of slurry, slurry water loss and adjust different laying angles, so as to provide theoretical analysis and design basis for slurry transportation technology, further provide a basis for solid-liquid two-phase flow, and provide good technical support. Summary of the invention

[0005] The purpose of the present invention is to provide an industrial test system for simulating long-distance pipeline transportation of slurry, which can be used to simulate pipeline transportation and how to transport safely and stably under changing working conditions, and provide theoretical analysis and design basis for slurry transportation technology.

[0006] The technical scheme adopted by the present invention is: an industrial test system for simulating long-distance pipeline transportation of slurry, including a feeding system, a slurry making system, a pumping system, a ring pipe system, a dehydration system, a water loss pipeline, a waste slurry treatment system and a control system. The feeding system includes a receiving platform, a screw conveyor and a crusher are arranged below the receiving platform, and the material is crushed and then transported to the buffer silo. An electro-hydraulic gate is arranged under the buffer silo to control the opening to send the material to the slurry making system. The slurry making system is provided with a process water storage tank and a rod mill, and the material is prepared into slurry and then transported to the pumping system. The pumping system is provided with a slurry storage tank and a water storage tank. The pumping system transports the slurry to the ring pipe system through a slurry pump. The ring pipe system includes three pipelines, namely, DN DN150 pipeline, DN200 pipeline, DN250 pipeline, a collection pipeline is set at the end of the three pipelines, a density meter II is set on the collection pipeline, the collection pipeline is connected to the waste slurry treatment system, the waste slurry treatment system includes a sweeping pit, when the slurry is transported to the collection pipeline, the density meter II is used to judge whether the slurry is qualified, the qualified slurry is transported to the slurry storage tank or the water storage tank, and the unqualified slurry is transported to the sweeping pit. A water loss pipeline is also set in the middle section of the DN150 pipeline to simulate the slurry loss condition. The slurry storage tank and the water storage tank are also connected to the dehydration system. When the simulation is completed, the material is dehydrated by the dehydration system and then recycled. The above systems are linked and controlled by the control system. The control system is specifically the Shenwei SCADA system.

[0007] The technical solution adopted by the present invention is also characterized in that: Furthermore, the feeding system includes a receiving platform, a screw conveyor I is arranged below the receiving platform, a crusher is arranged at the end of the screw conveyor I, a vibrating screen is arranged below the crusher, a seed material recovery system belt is also arranged between the vibrating screen and the crusher, a screw conveyor II is arranged below the vibrating screen, and the end of the screw conveyor II delivers the material to the buffer silo through a conveyor belt, and an electro-hydraulic gate is arranged at the bottom of the buffer silo.

[0008] Furthermore, the pulping system includes a quantitative feeder, which is arranged below the buffer silo, and the quantitative feeder delivers the material to the rod mill. The pulping system also includes a process water storage tank and an additive storage tank, which are respectively connected to the rod mill through pipelines, and the pipelines are respectively provided with a process water flow meter and an additive flow meter, the process water storage tank is provided with a process water pump, a process water tank level gauge and an agitator, and the additive storage tank is provided with an additive tank agitator, an additive tank level gauge and an additive pump; The rod mill is connected to a special vibrating screen for slurry, which transports qualified materials to a buffer slurry tank and returns the materials on the screen to the rod mill through rollers. The buffer slurry tank is connected to screw pumps I and II respectively. The screw pump I and screw pump II are both connected to the slurry storage tank and the water storage tank through pipelines, a density meter I and a flow meter I are arranged on the pipelines, and a slurry filter is arranged on the pipelines through a bypass; The buffer slurry tank is provided with a buffer slurry tank agitator and a buffer slurry tank liquid level gauge.

[0009] Furthermore, the pumping system includes a slurry storage tank and a water storage tank, and the slurry is transported to the ring pipe system through four slurry pumps and one diaphragm pump. The four slurry pumps are grouped in pairs and connected to the slurry storage tank and the water storage tank respectively; The slurry storage tank is provided with a slurry storage tank agitator and a slurry storage tank liquid level gauge; The water storage tank is provided with a water storage tank agitator and a water storage tank liquid level gauge.

[0010] Furthermore, a number of pressure transmitters are respectively arranged on the three pipelines of the ring pipe system, namely, the DN150 pipeline, the DN200 pipeline, and the DN250 pipeline. The pressure transmitters are evenly distributed on each pipeline. An abrasion short pipe is arranged 50 meters from the pump outlet of each of the three pipelines, namely, the abrasion short pipe I, the abrasion short pipe II, and the abrasion short pipe III. Six energy dissipation orifice plates with different apertures are also arranged on the DN250 pipeline. The aperture size is set according to needs. The six energy dissipation orifice plates are grouped into two and connected to the DN250 pipeline through a bypass. They are respectively, the energy dissipation orifice plate I and the energy dissipation orifice plate II, the energy dissipation orifice plate III and the energy dissipation orifice plate IV, the energy dissipation orifice plate V and the energy dissipation orifice plate VI. Pressure transmitters are arranged before and after each group of energy dissipation orifice plates. The ends of the DN150 pipeline, DN200 pipeline and DN250 pipeline are respectively provided with transparent glass tube I, transparent glass tube II and transparent glass tube III, and the front end of each transparent glass tube is also provided with metal hose I, metal hose II and metal hose III, and the front end of each metal hose is also provided with transparent glass tube IV, transparent glass tube V and transparent glass tube VI; The rear sections of the three pipelines are provided with adjustable brackets I and II, and a flow meter III is also provided on the collecting pipeline.

[0011] Furthermore, a flow meter II and a pressure transmitter are provided on the water loss pipeline.

[0012] Furthermore, the waste slurry treatment system includes a sweeping pit, and the sweeping pit is provided with a submersible slurry pump and a sweeping pit liquid level meter.

[0013] Furthermore, the dewatering system includes a centrifuge feed slurry pump, which transports the material to the centrifuge, and the centrifuge transports the centrifuged material to the material yard via a conveyor belt; The centrifuge outlet is connected to an emergency tank, which is connected to the centrifuge inlet via an emergency tank slurry pump and an emergency recovery pipeline; The centrifuge outlet is also connected to a centrifuge storage tank, which is connected to the concentrator through a centrifuge slurry pump, and a density meter and a flow meter IV are arranged between the centrifuge slurry pump and the concentrator. The bottom of the concentrator is connected to the filter press feed tank through a concentrator low-flow pump, and the feed tank is connected to the ultra-high pressure filter press through the filter press feed slurry pump. The filtrate recovery pipeline of the ultra-high pressure filter press is connected to the concentrator, and the ultra-high pressure filter press outlet is connected to the conveyor belt; The overflow from the top of the thickener is transported to the water treatment system through the overflow tank and the overflow slurry pump; The dehydration system also includes a concentrator dosing machine, and the concentrator dosing machine is connected to the concentrator.

[0014] The beneficial effects of the present invention are: 1. The industrial test system for simulating long-distance pipeline transportation of slurry of the present invention can simulate pipeline transportation and how to transport safely and stably under changing working conditions, and further study the startup residence time after the pipeline slurry loses water, the pipeline abrasion rate under different working conditions, the operating conditions of different pipe diameters and the operating conditions of different laying angles, so as to provide theoretical analysis and design basis for slurry transportation technology.

[0015] 2. The present invention connects various production systems in a unified manner through a control system, and generally adopts a SCADA system. The feeding and pulping systems realize closed-loop operation without waste discharge. Secondary crushing or secondary pulping is adopted to maximize the utilization of materials, achieve a high degree of automation, reduce operating staff, and improve efficiency.

[0016] 3. The feeding system of the present invention realizes the transportation of raw materials through two-stage spiral conveying, thereby avoiding the problem of scattering of raw materials, affecting the environment and increasing manpower, and realizes the recycling and reuse of seed materials through belts.

[0017] 4. The pulping system of the present invention is provided with two sets of preparation pipe slurry and high-concentration slurry systems, a return slurry and large particle recovery system, a slurry filter system, and a selected screw pump. The screw pump is a volumetric pump, which can increase the delivery volume, ensure the safe and stable operation of the subsequent system, and is also convenient for maintenance.

[0018] 5. The pumping system of the present invention is equipped with 4 slurry pumps, which can be switched or used in combination according to different conditions, thereby solving the complexity of production operation and switching the pumps according to different operating conditions to ensure operation.

[0019] 6. The annular pipe system of the present invention is provided with an abrasion short pipe, which is installed at 50 meters from the pump outlet and is in a stable position. The abrasion short pipe is detachable, and the purpose is to calculate the amount of abrasion of the slurry on the pipeline under different operating conditions. The metal hose and the adjustable brackets 111 and 112 are provided, and the purpose is to measure the repose angle and slip angle of the slurry under different laying angles of the pipeline. A pressure transmitter is provided on the pipeline, and the operating conditions under different working conditions are grasped through the pressure value. The energy dissipation annular pipe is provided with orifice plates of different apertures, and the combination of the orifice plates is adjusted according to different operating conditions. , eliminate excess pressure to ensure safe and stable operation of the pipeline. Each pipeline is equipped with three sampling points and a transparent glass tube at the top, middle and bottom. The purpose is to detect the slurry running in the pipeline, the changes in slurry concentration, ash content and particle size at different levels. The water loss pipeline is set to simulate the sudden situation of the Shenwei coal transportation project, the pipeline ruptures, resulting in slurry water loss and deposition in the pipeline. Different working conditions are simulated under different deposition times to ensure the safe and stable operation of the pipeline; three pipelines with different diameters are set to study the operation of slurry under different conveying volumes and different flow rates.

[0020] 7. The dehydration pipeline and adjustable lifting support system of the present invention, when simulating dehydration, opens the outlet valve of the dehydration pipeline, connects the outlet of the dehydration pipeline to the slurry storage tank to avoid slurry contamination, stops slurry supply, closes its inlet and outlet valves, and observes the state of the slurry after dehydration through the glass tube; in addition, the lifting support can be used in conjunction with the pipeline to simulate the complex terrain and various laying angles of the transportation project, and is used in conjunction.

[0021] 8. The feeding system, pulping system, pumping system, annular pipe system, water loss pipeline system and waste pulp treatment system of the present invention are operated in linkage, and the process operation can meet the linkage use of each system. The system achieves the linkage operation effect, improves the automation control effect, further reduces the number of on-site operators, and realizes precise and automated control of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the process diagram of the main equipment of the feeding system and pulping system of the present invention; Figure 2 It is the process diagram of the main equipment of the pumping system, the loop pipe system, the dewatering pipeline system and the waste slurry treatment system of the present invention; Figure 3 This is a process diagram of the main equipment and pipelines of the dehydration system of the present invention.

[0023] In the figure, 1. receiving platform, 2. screw conveyor I, 3. crusher, 4. seed material recovery system belt, 5. vibrating screen, 6. screw conveyor II, 7. buffer silo, 8. electro-hydraulic gate, 9. quantitative feeder, 10. rod mill, 11. process water storage tank, 12. process water pump, 13. process water flow meter, 14. process water tank level gauge, 15. agitator, 16. slurry special vibrating screen, 17. additive tank agitator, 18. additive tank level gauge, 19. Additive storage tank, 20. Additive pump, 21. Additive flow meter, 22. Buffer slurry tank agitator, 23. Buffer slurry tank level gauge, 24. Buffer slurry tank, 25. Screw pump I, 26. Screw pump II, 27. Density meter I, 28. Slurry filter, 29. Slurry tank agitator, 30. Slurry tank level gauge, 31. Slurry tank, 32. Water tank agitator, 33. Water tank level gauge, 34. Water tank, 35. Roller, 36. Flow meter I; 37. Slurry pump, 38. Pressure transmitter, 39. Flow meter II, 40. Energy dissipation orifice plate I, 41. Energy dissipation orifice plate II, 42. Energy dissipation orifice plate III, 43. Energy dissipation orifice plate IV, 44. Energy dissipation orifice plate V, 45. Energy dissipation orifice plate VI, 46. Transparent glass tube I, 47. Transparent glass tube II, 48. Transparent glass tube III, 133. Transparent glass tube IV, 134. Transparent glass tube V, 135. Transparent glass tube VI, 49. Densitometer II, 50. Flow meter III, 51. Sweeping pit, 52. Submersible slurry pump, 53. Diaphragm pump; 101. Abrasion short pipe I, 102. Abrasion short pipe II, 103. Abrasion short pipe III, 104. DN150 pipeline, 105. DN200 pipeline, 106. DN250 pipeline, 107. Metal hose I, 108. Metal hose II, 109. Metal hose III, 110. Water loss pipeline, 111. Adjustable bracket I, 112. Adjustable bracket II, 113. Sweeping pit level meter; 114. Centrifuge feed slurry pump, 115. Centrifuge, 116. Accident recovery pipeline, 117. Accident tank slurry pump, 118. Conveyor belt, 119. Accident tank, 120. Centrifuge liquid storage tank, 121. Centrifuge liquid slurry pump, 122. Density meter, 123. Flow meter IV, 124. Concentrator dosing machine, 125. Concentrator, 126. Concentrator low flow pump, 127. Overflow tank, 128. Filter press feed tank, 129. Filter press feed slurry pump, 130. Overflow slurry pump, 131. Ultra-high pressure filter press, 132. Filter press filtrate recovery pipeline. DETAILED DESCRIPTION

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

[0025] Example 1 Take the transportation of coal as an example.

[0026] Feeding system: Figure 1 As shown, the system sets up a receiving platform 1, and feeds coal to the crusher 3 through the screw conveyor Ⅰ2. The crusher SC101 crushes the coal particles with a feed size of 0-50mm to 0-6mm, and passes through the vibrating screen 5. The size of the screen plate can be changed according to production requirements. This experiment requires the size of the screen plate to be 6mm. The screened material is transported to the buffer silo 7 through the screw conveyor Ⅱ6. The screened material passes through the seed material recovery system belt 4 and is recovered to the crusher 3 through the belt for secondary crushing to achieve the effect of recycling. The raw coal is transported through two-stage screw conveying to avoid the problem of raw materials scattering, affecting the environment and increasing manpower. The seed coal is recycled and reused through the belt.

[0027] Pulping system: Figure 1 As shown, the system is provided with an electro-hydraulic gate 8 under the buffer silo 7 to feed coal by controlling the opening. After the coal falls into the quantitative feeder 9, it enters the rod mill 10 through a belt. The process water is fed by a diaphragm pump. An additive system, an additive storage tank 19, and an additive pump 20 are also provided. The pulping system can prepare 52-55% pipeline coal slurry or 61-65% high-concentration water-coal slurry. The two systems can be switched according to demand. The diameters of the steel rods in the rod mill 10 are 30, 40, 50, and 60 mm respectively. The prepared water-coal slurry passes through a special slurry vibrating screen 16. The qualified slurry enters the buffer slurry tank 24. The screened material enters the entrance of the rod mill 10 through a roller 35. The unqualified slurry is judged by a density meter I 27. The screw pump is sent to the entrance of the rod mill 10 through the return slurry pipeline for secondary grinding and pulping. The qualified slurry is transported by screw pump 25 / 26 (there are two screw pumps, one for backup and one for use), and a density meter I 27, a flow meter I 36, and a slurry filter 28 are set. The slurry filter 28 is provided with a bypass, and can enter the slurry storage tank 31 after being filtered by the slurry filter 28, or enter the slurry storage tank 31 through the bypass. The slurry filter 28 mainly removes iron ore, large particles, etc. in the coal slurry. The invention of this system mainly sets up two sets of preparation pipe slurry and high-concentration water-coal slurry systems, sets up a return slurry and large particle recovery system, sets up a slurry filter 28 filtration system, and selects a screw pump. The screw pump is a positive displacement pump, which can increase the delivery volume, ensure the safety and stable operation of the subsequent system, and facilitate maintenance.

[0028] Pumping system: Figure 2As shown, the system is provided with 4 slurry pumps 37, 1 diaphragm pump 53, 1 slurry storage tank 31 and 1 water storage tank 34. Two slurry pumps belong to the slurry supply slurry pumps, and two slurry pumps belong to the water supply slurry pumps. Since the outdoor ring pipe has three pipelines, namely, DN150 pipeline 104, DN200 pipeline 105 and DN250 pipeline 106, when using DN150 pipeline 104 and DN200 pipeline 105, the slurry supply slurry pump and the water supply slurry pump can be used separately to supply slurry. When using DN250 pipeline 106, the slurry supply slurry pump is used as the slurry feeding pump of the diaphragm pump 53 according to the load, and the diaphragm pump 53 is the main delivery pump. The use of the present invention solves the complexity of production operation, and the pump can be switched according to different operating conditions to ensure operation.

[0029] Environmental management system: Figure 2As shown, the system is equipped with three pipelines, namely DN150 pipeline 104, DN200 pipeline 105 and DN250 pipeline 106. DN250 pipeline 106 is equipped with energy dissipation orifice plate I 40, energy dissipation orifice plate II 41, energy dissipation orifice plate III 42, energy dissipation orifice plate IV 43, energy dissipation orifice plate V 44 and energy dissipation orifice plate VI 45. The orifice plate aperture ratios are set to be 0.25, 0.30, 0.33, 0.37 and 0.40 respectively, so as to simulate the pressure and impact on the pipeline caused by the potential energy generated by the terrain change in the Shenwei coal transportation project. The three pipelines are connected with abrasion short tube I 101, abrasion short tube II 102, abrasion short tube III 103, metal hose I 107, metal hose II 108, metal hose III 109, transparent glass tube I 46, transparent glass tube II 47, transparent glass tube III 48, transparent glass tube IV 133, transparent glass tube V 134, transparent glass tube VI 135, pressure transmitter 38 and water loss pipeline 110. Three sampling points, upper, middle and lower, are arranged on each pipeline. The present invention provides an abrasion short pipe, which is installed at 50 meters from the pump outlet and is in a stable position. The abrasion short pipe is detachable, and the purpose is to calculate the abrasion amount of the coal slurry on the pipeline under different operating conditions. The calculation is to weigh the mass of the abrasion short pipe at the initial installation stage and record it in the ledger. After each experiment, the slurry abrasion short pipe is disassembled, the mass is weighed, and the abrasion amount under the operating condition is calculated; the metal hose and the adjustable bracket I111 and the adjustable bracket II112 are provided to measure the repose angle and the slip angle of the coal slurry under different laying angles of the pipeline. A pressure transmitter is provided on the pipeline, and the operating conditions under different working conditions are grasped through the pressure values. The energy dissipation ring Orifice plates with different apertures are set on the pipe, and the combination of orifice plates is adjusted according to different operating conditions to eliminate excess pressure, so as to ensure safe and stable operation of the pipeline. Three sampling points and a transparent glass tube are set at the top, middle and bottom of each pipeline. The purpose is to detect the operation of coal slurry in the pipeline, the changes in coal slurry concentration, ash content and particle size at different layers. The water loss pipeline is set to simulate the sudden situation of Shenwei coal transportation project, the pipeline ruptures, resulting in water loss of coal slurry and deposition in the pipeline, and different working conditions are simulated under different deposition times to ensure safe and stable operation of the pipeline; three pipelines with different diameters are set to study the operation of coal slurry under different conveying volumes and different flow rates.

[0030] like Figure 2As shown, the water loss pipeline 110 and the adjustable brackets 111 and 112: The water loss pipeline in this system is set up based on the "2023.3.19" accident when the Shenwei pipeline coal transportation project was extended to the Huanglong section. The accident process was that the coal transportation pipeline was drilled by the drill bit, the pipeline lost pressure, and the coal slurry was instantly ejected, resulting in water loss in the coal slurry. The remedial measures were to weld the ruptured part of the pipeline, stop transportation from Shenmu to the extension station, keep the pipeline section in a full pipe state, and then the coal slurry extended to the Huanglong section was pressurized by a pump and pumped out by water pushing slurry to make the pipeline unobstructed. Based on this, the water-coal slurry pipeline laboratory is equipped with a water loss pipeline and an adjustable lifting bracket. The water loss pipeline is set on the DN150 pipeline 104, and the diameter of the water loss pipeline is DN50. When simulating water loss, the outlet valve of the water loss pipeline is opened, and the outlet of the water loss pipeline is connected to the slurry storage tank T201 to avoid coal slurry pollution. The slurry supply to DN150 is stopped, and its inlet and outlet valves are closed. The state of the coal slurry after water loss is observed through a transparent glass tube. In addition, the lifting bracket can be used in conjunction with the pipeline to simulate the complex terrain and various laying angles of the coal transportation project, and can be used in conjunction.

[0031] Waste pulp treatment system: Figure 2 As shown, when the annular pipe system is tested, water pushes slurry and slurry pushes water process operations are required. During this period, a slurry mixing section will be generated. The three pipelines have a summary pipeline, which has a discharge valve, a density meter II 49 and a flow meter III 50. When there is a slurry mixing section, open the discharge valve of the summary pipeline and observe the density counter value. When the value reaches the density of normal water or slurry, close the discharge valve, and normal process operations can be carried out to keep the pipeline as a single fluid. The slurry mixing section is discharged into the sweeping pit 51, which is equipped with a liquid level meter 113 and a submerged slurry pump 52. When the liquid level reaches the set discharge position, the submerged slurry pump 52 is started, and the slurry waste is discharged to the waste slurry pool at the Pucheng terminal for recycling and reuse.

[0032] Dehydration system: Figure 3As shown, after the ring pipe and water loss tests are completed, the material in the slurry tank or water storage tank is transported to the centrifuge 115 through the centrifuge feed slurry pump 114, and the product of the centrifuge 115 is transported to the coal stacking site through the conveyor belt 118, and then transported to the coal storage bunker of Pucheng Station by a car; the centrifuge liquid produced by the centrifuge 115 enters the centrifuge liquid storage tank 120, and is transported to the concentrator 125 by the centrifuge liquid slurry pump 121. The concentrator 125 is equipped with a concentrator dosing machine 124 (coagulant, coagulant), which is helpful to improve the concentrating effect of the concentrator 125 , the supernatant of the concentrator 125 overflows to the overflow tank 127, the low flow of the concentrator 125 is sent to the filter press feed tank 128 through the concentrator low flow pump 126, and then transported to the ultra-high pressure filter press 131 through the filter press feed slurry pump 129, the filter press coal produced is transported to the coal yard by belt, and transported to the coal storage bunker of Pucheng Station by car, and the filtrate of the filter press enters the concentrator 125 through the filter press filtrate recovery pipeline 132 for secondary concentration; the supernatant of the overflow tank 127 is transported to the water treatment system through the overflow slurry pump 130 and treated to qualified. The system also has an emergency tank 119. When the centrifuge has problems, the coal slurry enters the emergency tank 119, which plays a buffering role in the maintenance of the centrifuge, and then is transported to the entrance of the centrifuge 115 through the accident recovery pipeline 116 using the accident tank slurry pump 117.

[0033] Control system: This system adopts Shenwei SCADA system. The feeding system, pulping system, pumping system, ring pipe system, water loss pipeline system and waste pulp treatment system all adopt SCADA system, and the lifting bracket adopts electro-hydraulic control.

[0034] Example 2 Take the transportation of coal as an example.

[0035] Energy dissipation protection: When simulating the Shenwei coal transportation project, the same flow rate operating conditions are adopted. The 106 pipeline will be used, the slurry pump will be started as the feeding pump, and the diaphragm pump will be started as the main transportation pump. The diaphragm pump is mainly used to provide pressure maintenance and speed-up for the entire system. The energy dissipation orifice plate is used to determine the orifice plate combination with the aperture according to the flow rate and pressure. When the flow rate is greater than 1.8m / s, a small aperture combination is adopted, using energy dissipation orifice plate I40, energy dissipation orifice plate II41, energy dissipation orifice plate III42, and energy dissipation orifice plate IV43, with apertures of 0.25, 0.3, and 0.33. When the flow rate is 1.45-1.8m / s, energy dissipation orifice plate V44 and energy dissipation orifice plate VI45 are used, with apertures of 0.37 and 0.4.

[0036] Example 3 Take the transportation of coal as an example.

[0037] Water-slurry switching system, when a slurry pump is used for slurry supply test and ring pipe circulation, the slurry enters the slurry storage tank 31. After the slurry supply test, a slurry pump is used for water push slurry test. First, the coal slurry passes through the density meter Ⅱ49 to determine whether it has reached the slurry mixing stage. The slurry enters the slurry storage tank 31, and the density decreases. When it reaches 1-1.08kg / m3, it is the slurry mixing stage and enters the sweeping pit 51. When the value of the density meter Ⅱ49 is 1 kg / m3, the slurry mixing stage ends, and the system prompts to close the inlet valve of the sweeping pit 51, open the inlet valve of the water storage tank 34, and start water circulation.

[0038] Example 4 Take the transportation of coal as an example.

[0039] Pipeline flushing. After the test is completed, a slurry pump can be used to pump water to clean the pipeline. According to the density meter II 49, when the value is greater than 1 kg / m3, it enters the sweeping pit 51, and when it is equal to 1 kg / m3, it enters the water storage tank 34. The waste slurry in the sweeping pit 51 is pumped into the waste slurry pool of Pucheng station through the submersible slurry pump 52 for further treatment and dehydration to achieve efficient utilization of the waste slurry.

[0040] Example 5 Take the transportation of coal as an example.

[0041] SCADA control system: All production systems of the present invention are controlled by SCADA system, which sends out action messages through simulation calculation, numerical judgment, etc. to remind the upper-level personnel to perform the next operation, reducing the number of on-site operators. Only equipment inspection personnel and upper-level operators are required to operate the system.

[0042] Example 6 Take the transportation of coal as an example.

[0043] Laying angle adjustment: the adjustable bracket Ⅰ111 and the adjustable bracket Ⅱ112 provided in the present invention are hydraulic electric lifting devices, which can simulate pipeline laying, calculate the flow velocity and abrasion of pipelines at different angles, and observe the flow state of slurry. When running at different angles, the abrasion amount is calculated through the detachable abrasion short tube, and the flow state of the slurry after different lifting angles is observed through the glass tube.

Claims

1. An industrial test system for simulating long-distance pipeline transportation of slurry, characterized by: The invention comprises a feeding system, a pulping system, a pumping system, a ring pipe system, a dehydration system, a dewatering pipeline, a waste pulp treatment system and a control system. The feeding system comprises a receiving platform (1). A screw conveyor and a crusher (3) are arranged below the receiving platform (1). The material is crushed and then conveyed to a buffer silo (7). An electro-hydraulic gate (8) is arranged below the buffer silo (7). The crushed material is conveyed to the pulping system by controlling the opening. The pulping system is provided with a process water storage tank (11) and a rod mill (10). The material is prepared into slurry and then conveyed to the pumping system. The pumping system is provided with a slurry storage tank (31) and a water storage tank (34). The pumping system conveys the slurry to the ring pipe system through a slurry pump. The ring pipe system comprises three pipelines, namely a DN150 pipeline (104), a DN200 pipeline (105) and a DN 250 pipeline (106), a collection pipeline is arranged at the end of the three pipelines, a density meter II (49) is arranged on the collection pipeline, and the collection pipeline is connected to the waste pulp treatment system, and the waste pulp treatment system includes a sweeping pit (51). After the pulp is transported to the collection pipeline, the density meter II (49) is used to judge whether the pulp is qualified. The qualified pulp is transported to the pulp storage tank (31) or the water storage tank (34), and the unqualified pulp is transported to the sweeping pit (51). A dehydration pipeline (110) is also arranged in the middle section of the DN150 pipeline (104) for simulating the dehydration condition of the pulp. The pulp storage tank (31) and the water storage tank (34) are also connected to a dehydration system. After the simulation is completed, the material is dehydrated by the dehydration system and then recycled. The above-mentioned systems are operated in a linked manner and controlled by a control system. The control system is specifically a Shenwei SCADA system.

2. The industrial test system for simulating long-distance pipeline transportation of slurry according to claim 1 is characterized in that: The feeding system comprises a material receiving platform (1), a screw conveyor I (2) is arranged below the material receiving platform (1), a crusher (3) is arranged at the end of the screw conveyor I (2), a vibrating screen (5) is arranged below the crusher (3), a seed material recovery system belt (4) is arranged between the vibrating screen (5) and the crusher (3), a screw conveyor II (6) is arranged below the vibrating screen (5), and the end of the screw conveyor II (6) conveys material particles to a buffer bin (7) through a conveyor belt, and an electro-hydraulic gate (8) is arranged at the bottom of the buffer bin (7).

3. The industrial test system for simulating long-distance pipeline transportation of slurry according to claim 2 is characterized in that: The pulping system comprises a quantitative feeder (9), which is arranged below the buffer silo (7) and delivers material particles to the rod mill (10). The pulping system also comprises a process water storage tank (11) and an additive storage tank (19), the process water storage tank (11) and the additive storage tank (19) are respectively connected to the rod mill (10) via pipelines, and the pipelines are respectively provided with a process water flow meter (13) and an additive flow meter (21), the process water storage tank (11) is provided with a process water pump (12), a process water tank level meter (14) and an agitator (15), and the additive storage tank (19) is provided with an additive tank agitator (17), an additive tank level meter (18) and an additive pump (20); The rod mill (10) is connected to a slurry-specific vibrating screen (16), the slurry-specific vibrating screen (16) conveys qualified material particles to a buffer slurry tank (24), and conveys the screened material back to the rod mill (10) via a roller (35), and the buffer slurry tank (24) is respectively connected to a screw pump I (25) and a screw pump II (26); The screw pump I (25) and the screw pump II (26) are both connected to the slurry storage tank (31) and the water storage tank (34) through pipelines, a density meter I (27) and a flow meter I (36) are provided on the pipelines, and a slurry filter (28) is provided on the pipelines through a bypass; The buffer slurry tank (24) is provided with a buffer slurry tank agitator (22) and a buffer slurry tank liquid level meter (23).

4. The industrial test system for simulating long-distance pipeline transportation of slurry according to claim 2 is characterized in that: The pumping system comprises a slurry storage tank (31) and a water storage tank (34), and the slurry is transported to the annular pipe system through four slurry pumps (37) and one diaphragm pump (53). The four slurry pumps (37) are arranged in groups of two and are connected to the slurry storage tank (31) and the water storage tank (34) respectively. The slurry storage tank (31) is provided with a slurry storage tank agitator (29) and a slurry storage tank liquid level meter (30); The water storage tank (34) is provided with a water storage tank agitator (32) and a water storage tank liquid level gauge (33).

5. The industrial test system for simulating long-distance pipeline transportation of slurry according to claim 4 is characterized in that: The three pipelines of the annular pipe system, namely, the DN150 pipeline (104), the DN200 pipeline (105), and the DN250 pipeline (106), are provided with a plurality of pressure transmitters (38), which are evenly distributed on each pipeline. Abrasion short pipes, namely, abrasion short pipe I (101), abrasion short pipe II (102), and abrasion short pipe III (103), are provided at 50 meters from the pump outlet of the three pipelines. The DN250 pipeline ( Six energy dissipation orifice plates with different apertures are also arranged on the 106. The apertures are set according to needs. The six energy dissipation orifice plates are grouped in two and connected to the DN250 pipeline (106) through a bypass. They are energy dissipation orifice plate I (40) and energy dissipation orifice plate II (41), energy dissipation orifice plate III (42) and energy dissipation orifice plate IV (43), energy dissipation orifice plate V (44) and energy dissipation orifice plate VI (45). Pressure transmitters (38) are arranged before and after each group of energy dissipation orifice plates. A transparent glass tube I (46), a transparent glass tube II (47), and a transparent glass tube III (48) are respectively arranged at the ends of the DN150 pipeline (104), the DN200 pipeline (105), and the DN250 pipeline (106); a metal hose I (107), a metal hose II (108), and a metal hose III (109) are respectively arranged at the front end of each transparent glass tube; and a transparent glass tube IV (133), a transparent glass tube V (134), and a transparent glass tube VI (135) are respectively arranged at the front end of each metal hose; The rear sections of the three pipelines are provided with an adjustable bracket I (111) and an adjustable bracket II (112), and a flow meter III (50) is also provided on the collecting pipeline.

6. The industrial test system for simulating long-distance pipeline transportation of slurry according to claim 4, characterized in that: The dehydration pipeline is provided with a flow meter II (39) and a pressure transmitter (38).

7. The industrial test system for simulating long-distance pipeline transportation of slurry according to claim 4 is characterized in that: The waste slurry treatment system comprises a sweeping pit (51), and the sweeping pit (51) is provided with a submerged slurry pump (52) and a sweeping pit liquid level meter (113).

8. The industrial test system for simulating long-distance pipeline transportation of slurry according to claim 4, characterized in that: The dewatering system comprises a centrifuge feed slurry pump (114), the centrifuge feed slurry pump (114) conveys the material to the centrifuge (115), and the centrifuge (115) conveys the centrifuged material to a stockpile yard via a conveyor belt (118); The outlet of the centrifuge (115) is connected to an emergency tank (119), and the emergency tank (119) is connected to the inlet of the centrifuge (115) via an emergency tank slurry pump (117) and an emergency recovery pipeline (116); The centrifuge (115) outlet is also connected to a centrifuge storage tank (120), the centrifuge storage tank (120) is connected to a concentrator (125) via a centrifuge slurry pump (121), and a density meter (122) and a flow meter IV (123) are provided between the centrifuge slurry pump (121) and the concentrator (125), the bottom of the concentrator (125) is connected to a filter press feed tank (128) via a concentrator low-flow pump (126), the feed tank (128) is connected to an ultra-high pressure filter press (131) via a filter press feed slurry pump (129), the filtrate recovery pipeline (132) of the ultra-high pressure filter press (131) is connected to the concentrator (125), and the ultra-high pressure filter press (131) outlet is connected to a conveyor belt (118); The overflow from the top of the thickener (125) is transported to the water treatment system through the overflow tank (127) and the overflow slurry pump (130); The dehydration system further comprises a concentrator dosing machine (124), and the concentrator dosing machine (124) is connected to the concentrator (125).

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