CN219258907U - Novel coal logistics transportation system - Google Patents

Abstract

The utility model discloses a novel coal logistics transportation system, which comprises a pipe coal slurry conveying system and a pipe coal slurry conveying system which are sequentially connected, wherein the pipe coal slurry conveying system is respectively connected with a clean coal system for preparing coal slurry through dewatering and a high-concentration coal slurry product preparing and conveying system. The utility model can realize the complete transportation flow of pulping, pumping and terminal treatment, and solves the problems of high loss, high cost and high spontaneous combustion risk existing in the prior transportation by adopting the road and the railway.

Description

Novel coal logistics transportation system

Technical Field

The utility model belongs to the technical field of solid material logistics transportation, and relates to a novel coal logistics transportation system.

Background

The coal transportation mode of China is divided into three modes of railway, waterway and highway, wherein the highway and railway occupy 85% of transportation scale, but the highway and railway transportation generally have the problems of transportation loss, higher cost and spontaneous combustion risk, and the natural resource consumption for constructing the railway and the highway is high. Therefore, optimizing and adjusting the coal transportation mode, developing new energy transportation facilities and related matched technologies become important points of research in China for many years, and pipeline coal transportation is used as a logistics transportation mode of new bulk cargo coal, so that the development of the pipeline coal transportation mode becomes a trend. However, the pipeline coal conveying comprises pulping, pumping, terminal treatment and other systems, and a mature coal logistics conveying system does not exist at present, so that the actual requirements of coal conveying cannot be met.

Disclosure of Invention

The utility model aims to provide a novel coal logistics transportation system which can realize complete transportation flow from pulping, pumping and terminal treatment and solve the problems of high loss, high cost and high spontaneous combustion risk existing in the conventional transportation of coal by adopting highway and railway.

The technical scheme adopted by the utility model is that the novel coal logistics transportation system comprises a pipe coal slurry preparation system and a pipe coal slurry transportation system which are sequentially connected, wherein the pipe coal slurry transportation system is respectively connected with a clean coal preparation system by dehydrating the pipe coal slurry and a high-concentration coal water slurry product preparation and transportation system.

The utility model is also characterized in that:

the pipe coal slurry conveying preparation system is sequentially connected with a coal storage bin, a crusher, a powder coal buffer bin, a quantitative coal feeder and a rod mill, wherein the rod mill is respectively connected with a safety screen and a slurry returning tank, and the slurry returning tank is sequentially connected with a qualified coal slurry tank and a slurry storage tank.

The pipe coal slurry conveying system comprises a head slurry feeding pump, a safety ring pipe and an inlet of a head high-pressure pump which are sequentially connected, an outlet of the head high-pressure pump is connected with a conveying pipeline, and the conveying pipeline is connected with a slurry storage tank of a terminal pump station.

The transport pipeline is sequentially provided with a pulp storage tank of the middle pump station, a pulp feeding pump of the middle pump station and a high-pressure pump of the middle pump station.

The transport pipeline is connected with a high-pressure pump of the middle pump station through a closed-circuit joint pipeline.

An energy storage station and an energy dissipation station are sequentially arranged between the conveying pipeline and the slurry storage tank of the terminal pump station.

The system for preparing clean coal by dehydrating pipe coal slurry comprises a feeding filtering buffer tank, a centrifuge and a coarse coal scraper conveyor which are sequentially connected, wherein the centrifuge is sequentially connected with a centrifugal liquid storage tank, a thickener, a filter press feeding tank, a filter press, a fine coal scraper conveyor and a fine coal belt conveyor, and the thickener is also respectively connected with a water treatment system and the filter press.

The high-concentration water-coal-slurry product preparation and conveying system comprises a raw coal slurry buffer tank, a concentration centrifuge, a dehydrated coarse coal kneader, a low-pressure coal slurry tank, a middle buffer tank, a high-concentration slurry high-pressure pump and a user large coal slurry tank which are connected in sequence;

the concentration centrifugal machine is also sequentially connected with a centrifugal liquid tank, a concentration tank and a water treatment system;

the concentrating and concentrating tank is also sequentially connected with a feeding groove of a concentrating filter press, a spiral receiving bin, a filter pressing fine coal kneading machine, a kneading groove, a coarse pulp groove, a fine mill, a fine pulp groove, an ultra-fine mill and an ultra-fine pulp groove; the superfine slurry tank is also connected with a dehydrated coarse coal kneader, and the kneading tank is also connected with the dehydrated coarse coal kneader.

The beneficial effects of the utility model are as follows:

1. in the pipeline transportation system provided by the utility model, the occupied area of the coal conveying pipeline is small, and the system accords with the national policy of saving land; the coal conveying pipeline is buried and operated in a closed mode, and the disaster resistance to severe weather is high; the transportation pressure of the traditional railway and highway is relieved, and the transportation cost is 17-35% of that of the traditional mode; avoiding the risks of transportation loss, dust pollution, high air return rate, spontaneous combustion and the like commonly existing in the traditional railway and highway transportation.

2. The utility model prepares the medium-high concentration pipe coal slurry under the condition of no additive by only adjusting the proportion of the steel bars of the rod mill.

3. The non-disturbance switching technology of closed circuit and open circuit of multiple pump stations is combined with the linkage energy dissipation equipment of the energy storage station and the energy dissipation station, so that stable operation of the pipe coal slurry in complex topography with ultra-long distance and high fall is realized.

4. An open-circuit starting and switching closed-circuit control system among stations of the ultra-long distance pipeline coal conveying system is established, and the operation requirements under different working conditions are met.

5. Adopts the three-peak grading concentration process of medium concentration dehydration and superfine grinding pulping to realize the concentration and quality improvement of the pipe coal slurry into high concentration gasified coal water slurry for the first time.

6. Meanwhile, the method comprises the preparation process of medium-concentration coal slurry conveying pipes and high-concentration coal water slurry, and the pipeline conveying mode of medium-concentration coal slurry conveying pipes and high-concentration coal water slurry conveying pipes is adopted, so that the pipeline coal conveying is realized in all directions.

Drawings

FIG. 1 is a schematic diagram of the overall structure of a novel coal logistics transportation system of the present utility model;

FIG. 2 is a schematic diagram of a system for preparing a coal slurry for pipe transportation in a novel coal logistics transportation system according to the present utility model;

FIG. 3 is a schematic diagram of a pipe coal slurry conveying system in a novel coal logistics transportation system;

FIG. 4 is a schematic diagram of a system for preparing clean coal by dewatering a pipe-conveyed coal slurry in a novel coal logistics transportation system;

FIG. 5 is a schematic diagram of a system for preparing and transporting a high concentration coal water slurry product in a novel coal logistics transportation system according to the present utility model.

In the figure, 1, a coal storage bin, 2, a crusher, 3, a tail coal buffer bin, 4, a quantitative coal feeder, 5, a rod mill, 6, a safety screen, 7, a slurry returning tank, 8, a slurry returning pump, 9, a qualified coal slurry tank, 10, a slurry storage tank, 11, a head end slurry feeding pump, 12, a safety loop, 13, a head end high-pressure pump, 14, an intermediate pump station slurry storage tank, 15, an intermediate pump feeding pump, 16, an intermediate pump station high-pressure pump, 17, an energy storage station, 18, an energy dissipation station, 19, a terminal pump station slurry storage tank, 20, a feed filtering buffer tank, 21, a centrifuge, 22, a coarse coal scraper conveyor, 23, a coarse coal belt conveyor, 24, a centrifugal liquid storage tank, 25, a thickener, 26, a filter press feed tank, 27, a filter press, 28, a fine coal scraper conveyor, 29. Fine coal Belt conveyor, 30. Raw coal slurry buffer tank, 31. Concentration centrifuge, 32. Dewatered coarse coal kneader, 33. Centrifugal tank, 34. Concentration tank, 35. Water treatment System, 36. Concentration filter press feed tank, 37. Concentration filter press, 38. Spiral receiving bin, 39. Pressure filtration fine coal kneader, 40. Kneading tank, 41. Coarse slurry tank, 42. Fine mill, 43. Fine slurry tank, 44. Ultra fine mill, 45. Ultra fine slurry tank, 46. Loop branch, 47. Closed-loop joint beat pipeline, 48. Transport pipeline, 49. Low pressure slurry tank, 50. Intermediate buffer tank, 51. High concentration slurry high pressure pump, 52. High concentration slurry delivery pipeline, 53. User large slurry tank.

Detailed Description

The utility model will be described in detail below with reference to the drawings and the detailed description.

The utility model discloses a novel coal logistics transportation system, which is shown in figure 1 and comprises a pipe coal slurry preparation system for preparing coal slurry, a pipe coal slurry transportation system for transporting the coal slurry, a pipe coal slurry dehydration clean coal preparation system for dehydrating the coal slurry, and a high-concentration water coal slurry product preparation and transportation system for preparing and transporting the water coal slurry product.

As shown in fig. 2, the pipe coal slurry preparation system comprises a coal storage bin 1, a crusher 2 is arranged at the downstream of the coal storage bin 1, a powder coal buffer bin 3 is arranged at the downstream of the crusher 2, a quantitative feeder 4 is arranged at the bottom of the powder coal buffer bin 3, the lower part of the tail end of the quantitative feeder 4 is right opposite to the inlet of a rod mill 5, the lower part of the outlet end of the rod mill 5 is right opposite to a safety screen 6, the tail end blanking port of the screen surface of the safety screen 6 is right opposite to the inlet of a slurry returning tank 7, the outlet of the slurry returning tank 7 is connected with the inlet of the rod mill 5 through a slurry returning pump 8 and a pipeline, the right lower part of the screen surface of the safety screen 6 is right opposite to the inlet of a qualified coal slurry tank 9, and the downstream of the qualified coal slurry tank 9 is a slurry storing tank 10. The feed inlet of the rod mill 5 is provided with a process water pipeline.

The structure of the pipe coal slurry conveying system is shown in fig. 3, and the pipe coal slurry conveying system comprises a head-end slurry feeding pump 11, wherein an outlet of the head-end slurry feeding pump 11 is respectively connected with a safety loop pipe 12 and a loop pipe branch 46, pipe tails of the safety loop pipe 12 and the loop pipe branch 46 are connected to an inlet of a head-end high-pressure pump 13, an outlet of the head-end high-pressure pump 13 is connected with a conveying pipeline 48, an energy storage station 17, an energy dissipation station 18 and a plurality of intermediate pump stations are arranged along the conveying pipeline 48, and the intermediate pump stations comprise an intermediate pump station slurry storage tank 14, an intermediate pump station slurry feeding pump 15 and an intermediate pump station high-pressure pump 16. The transport pipeline 48 can be led to the inlet of the intermediate pump station slurry storage tank 14, the outlet of the intermediate pump station slurry storage tank 14 is connected with the inlet of the intermediate pump station slurry feeding pump 15, and the outlet of the intermediate pump station slurry feeding pump 15 is connected with the inlet of the intermediate pump station high-pressure pump 16.

The transport pipe 48 can also lead to the inlet of the high-pressure pump 16 of the middle pump station through the closed-circuit joint-beating pipe 47, and the outlet of the high-pressure pump 16 of the middle pump station is continuously connected with the transport pipe 48 and finally is directly connected with the slurry storage tank 19 of the terminal pump station.

The structure of the system for preparing clean coal by dehydrating the pipe coal slurry is shown in fig. 4, and the system comprises a feeding filtering buffer tank 20, wherein the downstream of the feeding filtering buffer tank 20 is connected with a centrifugal machine 21, and the right lower part of a discharge hole of the centrifugal machine 21 corresponds to a coarse coal scraper conveyor 22 for conveying centrifugal coal; the right lower part of the tail end of the coarse coal scraper conveyor 22 corresponds to a coarse coal belt conveyor 23; the coarse coal belt conveyor 23 conveys clean coal # 1.

The water outlet of the centrifugal machine 21 is connected with a centrifugate storage tank 24 through a pipeline to convey centrifugate; the downstream tail end of the centrifugate storage tank 24 is connected with a thickener 25, the overflow drain outlet in the middle of the thickener 25 is directly connected with a water treatment system 35, the downstream of the drain outlet in the bottom of the thickener 25 is provided with a filter press feeding tank 26, the thickener 25 conveys underflow to the filter press feeding tank 26, the downstream of the filter press feeding tank 26 is provided with a filter press 27, the water collecting and draining pipeline of the filter press 27 is directly connected with the thickener 25, and the filter press 27 conveys filtrate to the thickener 25; a fine coal scraper conveyor 28 is arranged right below the discharge opening of the filter press 27, and the filter press 27 conveys filter-pressed coal to the fine coal scraper conveyor 28. And a fine coal belt conveyor 29 corresponds to the position right below the tail end of the fine coal scraper conveyor 28, and the fine coal belt conveyor 29 conveys No. 2 clean coal.

The structure of the high-concentration water-coal-slurry product preparation and conveying system is shown in fig. 5, and the high-concentration water-coal-slurry product preparation and conveying system comprises a raw coal slurry buffer tank 30, wherein a concentrating centrifuge 31 is arranged at the downstream of the raw coal slurry buffer tank 30, a dehydrated coarse coal kneader 32 is arranged at the downstream of a discharge port of the concentrating centrifuge 31, the concentrating centrifuge 31 conveys centrifugal coal to the dehydrated coarse coal kneader 32, additives and process water are simultaneously added into the dehydrated coarse coal kneader 32, the inlet of a low-pressure coal slurry tank 49 corresponds to the position right below a discharge port of the dehydrated coarse coal kneader 32, the dehydrated coarse coal kneader 32 conveys high-concentration water-coal slurry into the low-pressure coal slurry tank 49, an intermediate buffer tank 50 is arranged at the downstream of the low-pressure coal slurry tank 49, a high-concentration slurry high-pressure pump 51 is arranged at the downstream of the intermediate buffer tank 50, and the outlet of the high-concentration slurry high-pressure pump 51 is connected with a large coal-slurry tank 53 of a user through a high-concentration slurry conveying pipeline 52;

the water outlet of the concentration centrifuge 31 is connected with the centrifugal liquid tank 33 through a pipeline, the concentration centrifuge 31 conveys centrifugal liquid into the centrifugal liquid tank 33, the downstream of the centrifugal liquid tank 33 is a concentration and concentration tank 34, the middle overflow water outlet of the concentration and concentration tank 34 is directly connected with a water treatment system 35, the downstream of the bottom discharge outlet of the concentration and concentration tank 34 is a concentration filter press inlet tank 36, the bottom flow in the concentration and concentration tank 34 enters the concentration filter press inlet tank 36, the downstream of the concentration filter press inlet tank 36 is a concentration filter press 37, the water collecting and discharging pipeline of the concentration filter press 37 is directly connected with the concentration and concentration tank 34, and the filtrate in the concentration filter press 37 enters the concentration and concentration tank 34; a spiral receiving bin 38 is arranged at the downstream of the discharge port of the concentration filter press 37, and the concentration filter press 37 sends filter-pressed coal into the spiral receiving bin 38; the downstream of the spiral receiving bin 38 is a filter-pressing fine coal kneader 39, and process water and additives are simultaneously added into the filter-pressing fine coal kneader 39; the inlet of a kneading tank 40 is correspondingly arranged right below the blanking port of the filter-pressing fine coal kneader 39, a coarse slurry tank 41 is arranged at the downstream of the kneading tank 40, the discharging port of the kneading tank 40 is divided into two paths, one path is connected with the inlet of the dewatering coarse coal kneader 32, and the other path is connected with the inlet of the coarse slurry tank 41; the downstream of the coarse slurry tank 41 is a fine grinder 42, the discharge port of the fine grinder 42 is connected with the inlet of the fine slurry tank 43 through a pipeline, the downstream of the fine slurry tank 43 is an ultrafine grinder 44, the discharge port of the ultrafine grinder 44 is connected with the inlet of the ultrafine slurry tank 45 through a pipeline, the discharge port of the ultrafine slurry tank 45 is divided into two paths, one path is connected with the inlet of the dehydrated coarse coal kneader 32, and the other path is connected with the filter pressing fine coal kneader 39.

The dewatering coarse coal kneader 32, the press-filter fine coal kneader 39 and the coarse slurry tank 41 are provided with process water and additive feed lines, respectively.

The working flow of the novel coal logistics transportation system is as follows:

step 1, the preparation process of the pipe coal slurry preparation system comprises the following steps:

raw coal is conveyed by a belt to enter a coal storage bin 1 for buffering, coal discharged from the bottom of the coal storage bin 1 is conveyed by the belt to enter a crusher 2 for crushing to a certain granularity, crushed coal is conveyed by a coal powder buffer bin 3 for buffering, the crushed coal powder automatically flows by gravity to enter a quantitative feeder 4 for weighing, the crushed coal powder and a certain amount of process water enter a rod mill 5 for fully grinding into pipe coal conveying slurry with a certain concentration, the pipe coal conveying slurry is discharged from an outlet of the rod mill 5 and then screened by a safety screen 6, the screen mesh of the safety screen 6 is 3mm, oversize materials enter a slurry returning tank 7 as unqualified products, are lifted by a slurry returning pump 8 to enter an inlet of the rod mill 5 for secondary grinding, undersize materials enter a qualified coal slurry tank 9 for buffering, and finally are conveyed into a slurry storing tank 10 for storage and are ready for conveying. In the step 1, the particle size of the feeding material of the crusher 2 is-50 mm, and the particle size of the discharging material is-6 mm. In the step 1, the ratio of the diameter of the steel bars in the bar mill 5 is 50mm to 65mm to 75 mm=3-4 to 3-4;

in the step 1, the qualified standard of the pipe coal slurry is as follows: the concentration of the pipe coal slurry is 51% -55%, the viscosity is 50-150 mpa.s, the maximum grain diameter is less than 1.2mm, the stability meets the requirements of standing for 72 hours, no hard precipitation exists, the pH is 7-9, and the minus accumulation value of the screen lower is: -325 mesh 20% -25%, 200 mesh 25% -30%, 100 mesh 40% -45%, 48 mesh 70% -75%, 35 mesh 80% -85%, 20 mesh 90% -95%, 14 mesh 97% -100%.

In step 1, when the index of the pipe coal slurry is unqualified, the unqualified coal slurry is directly pumped into a waste slurry tank (the waste slurry tank belongs to a special slurry storage tank for storing waste slurry in the slurry storage tank 10).

Step 2, the conveying process of the pipe coal slurry conveying system is as follows:

the pipe coal slurry is conveyed into a safety loop 12 through a head-end slurry feeding pump 11 for safety inspection before conveying, and enters a head-end high-pressure pump 13 for pressurizing after being qualified (the pressure exerted by the head-end high-pressure pump 13 is more than 8 Mpa), or the pipe coal slurry is conveyed into the high-pressure pump 13 through a loop branch 46 through the slurry feeding pump 11 for pressurizing, and then enters a line conveying pipeline 46 until reaching a downstream intermediate pump station; the coal slurry enters the middle pump station slurry storage tank 14 for buffering after reaching the middle pump station, then automatically flows into the middle pump station slurry feeding pump 15, and then enters the middle pump station high-pressure pump 16 for pressurizing, or the pipe coal slurry enters the middle pump station high-pressure pump 16 for pressurizing after reaching the middle pump station, and then enters the line conveying pipeline 46 again, and is continuously pressurized and conveyed by the middle pump station in a relay mode until reaching the terminal pump station slurry storage tank 19.

In the step 2, the pipe coal slurry can enter the safety ring pipe 12 for safety inspection after passing through the head-end slurry feeding pump 11 and then enter the head-end high-pressure pump 13, or can bypass the safety ring pipe 12 and directly enter the head-end high-pressure pump 13 through the ring pipe branch 46; the safety loop 12 may be bypassed only if the system is operating stably for a long period of time and the product is acceptable.

In step 2, the system stably operates for a long time, and when the inlet pressure of the pipe coal slurry reaches the middle pump station and meets the inlet pressure requirement of the high-pressure pump 16 of the middle pump station, the pipe coal slurry can directly enter the high-pressure pump 16 of the middle pump station through the closed-circuit joint pipeline 47 to form closed-circuit operation along the line.

In the step 2, the rated inlet pressure of the head-end high-pressure pump 13 is 0.3-0.5MPa, the rated outlet pressure is 12-14MPa, the rated inlet pressure of the middle pump station high-pressure pump 16 is 0.3-0.5MPa, the rated outlet pressure is 9-11MPa, and all the outlet pressures of the high-pressure pumps between stations are determined according to the topography and station spacing along the line.

In the step 2, the energy storage station 17 and the energy dissipation station 18 are required to be arranged according to the topography situation along the line, if the topography has long distance and high drop zone, the energy storage station 17 is required to be arranged at the high point of the pipeline for supplementing slurry so as to prevent the high point from forming negative pressure and the pipeline from deforming; an energy dissipation station 18 is arranged at the low point of the pipeline for suppressing pressure so as to prevent an accelerating flow and a vacuum section from being formed at a high position, and the energy dissipation station is used for eliminating surplus potential energy of coal slurry so as to prevent serious safety accidents caused by abrasion of the pipe section at the low position.

In the step 2, the length of the conveying pipeline 48 is more than or equal to 10km, the outer diameter is 10-24 inches, the wall thickness is 10-20mm, the laying maximum angle is smaller than the maximum value of the slip angle and the repose angle of the coal slurry, the inner pipe of the pipeline is required to be full-pipe flow, the flow speed is 1.2-1.9m/s, and the friction loss along the line is 0.08-0.15MPa/km.

The coal slurry reaching the terminal pump station and in the slurry storage tank 19 respectively enters a clean coal preparation system by pipe-conveying coal slurry dehydration and a high-concentration coal water slurry product preparation and conveying system.

Step 3, the process of the clean coal system for preparing the pipe coal conveying slurry by dehydration comprises the following steps:

the pipe coal slurry enters a feeding filtering buffer groove 20 for buffering, then enters a centrifugal machine 21 for centrifugal dehydration, the dehydrated centrifugal coal falls into a coarse coal scraper conveyor 22 (the granularity of the coarse coal is more than 0.3 mm) below the centrifugal machine 21, and then is conveyed into a bin by a coarse coal belt conveyor 23 to obtain No. 1 clean coal; the centrifugate of the centrifuge 21 flows into a centrifugate storage tank 24 for buffering, then enters a thickener 25 for full sedimentation and concentration, overflow of the thickener 25 enters a water treatment system 35, underflow of the thickener 25 enters a filter press feeding tank 26 for buffering, then enters a filter press 27 for filter pressing and dehydration, filtrate of the filter press 27 also enters the thickener 25 for full sedimentation and concentration, dehydrated filter pressing coal falls into a fine coal scraper conveyor 28 (granularity of fine coal is below 0.15 mm) below the filter press 27, and then is conveyed into a cabin by a fine coal belt conveyor 29 to obtain No. 2 clean coal.

In step 3, the centrifuge 21 and the filter press 27 respectively generate two kinds of clean coal, and the two kinds of clean coal can be divided into different quality grades according to moisture and ash content, transported by different belts and stored in different coal bins, and sold according to the demands of users, so as to realize the maximization of benefits.

Step 4, the process of the high-concentration coal water slurry product preparation and conveying system is as follows:

the pipe coal slurry enters a raw coal slurry buffer tank 30 for buffering, then enters a concentration centrifuge 31 for centrifugal dehydration, the dehydrated centrifugal coal, a proper amount of process water and additives enter a dehydrated coarse coal kneader 32 for dilution and uniform mixing, the centrifugate of the concentration centrifuge 31 enters a centrifugate tank 33 for buffering, the centrifugate enters a concentration tank 34 for sedimentation and concentration through a pipeline, the overflow of the centrifugate after concentration enters a water treatment system 35, the underflow of the concentration tank 34 enters a concentration filter press for buffering in a trough 36, and then enters a concentration filter press 37 for filter pressing and dehydration, the filter liquor after filter pressing also enters the concentration tank 34 for sedimentation and buffering, the filter pressing coal after filter pressing and dehydration enters a spiral receiving bin 38 for scattering and buffering, then, the mixture is fully diluted and mixed with a proper amount of process water and additive solution into a filter-pressing fine coal kneader 39 to form filter-pressing fine slurry with a certain concentration, then the filter-pressing fine slurry is buffered in a kneading tank 40, then part of the filter-pressing fine slurry enters a dewatering coarse coal kneader 32, the other part of the filter-pressing fine slurry enters a coarse slurry tank 41 (the coarse slurry is 36-42% of the filter-pressing fine slurry) together with a proper amount of process water and additive solution, then the mixture is diluted and mixed again, the mixture enters a fine mill 42 to carry out fine grinding, the ground fine slurry enters a fine slurry tank 43 to buffer, then enters an superfine grinder 44 to carry out superfine grinding again, the superfine slurry after the secondary grinding enters a superfine slurry tank 45 to buffer, part of the superfine slurry tank 45 overflows into the dewatering coarse coal kneader 32, and the other part of the slurry enters the filter-pressing fine coal kneader 39. Finally, the centrifugal coal of the concentration centrifuge 31, the filter-pressing fine slurry of the kneading tank 40 and the fine slurry superfine slurry of the superfine slurry tank 45 are uniformly mixed in the dehydrated coarse coal kneader 32 to form high-concentration coal water slurry meeting the requirements of users, the high-concentration coal water slurry is stored in the low-pressure coal slurry tank 49 and then enters the middle buffer tank 50 for buffering, and then the high-concentration coal water slurry is conveyed into the user large coal slurry tank 53 through the high-concentration slurry conveying pipeline 52 by the high-concentration slurry high-pressure pump 51 (the high pressure is 1-3 MPa).

In the step 4, the concentration of the high-concentration coal water slurry product is 60% -68%, the viscosity is less than 800 mpa.s, the pH is 7-9, no hard precipitate exists in a standing experiment for 72 hours, and the minus accumulation value of the undersize is as follows: -325 mesh 25% -35%, 200 mesh 30% -40%, 35 mesh 80% -85%, 14 mesh 97% -100%.

In step 4, the dewatered coarse coal kneader 32 comprises centrifugal coal of a concentrating centrifuge 31, filter-pressed fine pulp of a kneading tank 40, fine pulp superfine pulp of a superfine pulp tank 45, and additional process water and additives to form a trimodal grading.

In the step 4, the mass ratio of the filter-pressing fine slurry to the fine slurry/superfine slurry is 65-75:15-25:8-12, wherein the water content of the centrifugal coal of the concentration centrifuge 31 is 15-25%, the concentration of the filter-pressing fine slurry in the filter-pressing fine coal kneader 39 is 50-58%, and the concentration of the fine slurry and the superfine slurry is 36-42%.

In the step 4, the water content of the centrifugal coal generated by the concentration centrifugal machine 31 is 15-25%, and the water content of the filter-pressed coal generated by the concentration filter press 37 is 25-35%.

In step 4, the average particle size of the discharged material of the fine mill is about 20-30 μm, and the average particle size of the discharged material of the ultra-fine mill is about 5 μm.

In the step 4, the additive raw material is naphthalene series lignosulfonate, regulator=4-5:4-5:1-2, the addition amount is 2-3 per mill of the total dry base coal mass, and the addition points of the process water and the additive are a dehydrated coarse coal kneader 32, a filter pressing fine coal kneader 39 and a coarse slurry tank 41.

In step 4, the process water and the water used for diluting the additives come from the overflow of the concentrating tank 34.

In the step 4, the outer diameter of the high-concentration slurry conveying pipeline is 8-12 inches, the wall thickness is 10-15mm, the length is 700-1000m, the high-concentration water coal slurry needs to flow in the pipeline in a turbulent mode, and the flow speed is 0.7-1.5m/s.

Claims (8)

1. A novel coal logistics transportation system, characterized in that: comprises a pipe coal slurry preparation system and a pipe coal slurry conveying system which are connected in sequence, wherein the pipe coal slurry conveying system is respectively connected with a clean coal preparation system for dehydrating coal slurry and a high-concentration coal water slurry product preparation and conveying system.

2. The novel coal logistics transportation system of claim 1, wherein: the coal slurry preparation system comprises a coal storage bin (1), a crusher (2), a last coal buffer bin (3), a quantitative coal feeder (4) and a rod mill (5), wherein the coal storage bin, the crusher (2), the last coal buffer bin, the quantitative coal feeder (4) and the rod mill (5) are sequentially connected, the rod mill (5) is respectively connected with a safety screen (6) and a slurry returning tank (7), and the slurry returning tank (7) is sequentially connected with a qualified coal slurry tank (9) and a slurry storage tank (10).

3. The novel coal logistics transportation system of claim 1, wherein: the pipe coal slurry conveying system comprises a head-end slurry feeding pump (11), a safety ring pipe (12) and an inlet of a head-end high-pressure pump (13) which are sequentially connected, an outlet of the head-end high-pressure pump (13) is connected with a conveying pipeline (48), and the conveying pipeline (48) is connected with a terminal pump station slurry storage tank (19).

4. A novel coal logistics transportation system in accordance with claim 3 wherein: the conveying pipeline (48) is sequentially provided with a middle pump station slurry storage tank (14), a middle pump station slurry feeding pump (15) and a middle pump station high-pressure pump (16).

5. A novel coal logistics transportation system in accordance with claim 3 wherein: the conveying pipeline (48) is connected with the high-pressure pump (16) of the middle pump station through a closed-circuit joint pipeline (47).

6. A novel coal logistics transportation system in accordance with claim 3 wherein: an energy storage station (17) and an energy dissipation station (18) are sequentially arranged between the conveying pipeline (48) and the slurry storage tank (19) of the terminal pump station.

7. The novel coal logistics transportation system of claim 1, wherein: the system for preparing clean coal by dehydrating the pipe coal slurry comprises a filtering buffer groove (20), a centrifuge (21) and a coarse coal scraper conveyor (22) which are sequentially connected, wherein the centrifuge (21) is sequentially connected with a centrifugal liquid storage tank (24), a thickener (25), a filter press feeding tank (26), a filter press (27), a fine coal scraper conveyor (28) and a fine coal belt conveyor (29), and the thickener (25) is further connected with a water treatment system (35) and the filter press (27) respectively.

8. The novel coal logistics transportation system of claim 1, wherein: the high-concentration water-coal-slurry product preparation and conveying system comprises a raw coal slurry buffer tank (30), a concentration centrifuge (31), a dehydrated coarse coal kneader (32), a low-pressure coal slurry tank (49), a middle buffer tank (50), a high-concentration slurry high-pressure pump (51) and a user large coal slurry tank (53) which are connected in sequence;

the concentration centrifuge (31) is also sequentially connected with a centrifugal liquid tank (33), a concentration tank (34) and a water treatment system (35);

the concentrating and concentrating tank (34) is also sequentially connected with a feeding groove (36) of a concentrating filter press, the concentrating filter press (37), a spiral receiving bin (38), a filter pressing fine coal kneading machine (39), a kneading and mixing groove (40), a coarse pulp groove (41), a fine grinding machine (42), a fine pulp groove (43), an ultrafine grinding machine (44) and an ultrafine pulp groove (45); the ultra-fine slurry tank (45) is also connected with a dehydrated coarse coal kneader (32).

Images