Coal slime super-high pressure dewatering and conveying system and working method thereof

Abstract

This invention provides an ultra-high pressure dewatering and conveying system for coal slime and its working method, solving the problems of high moisture content and difficult conveying of coal slime. The inner cylinder of the distributor is fixedly installed inside the sleeve housing; the inner cone cylinder is fixed inside the inner cylinder of the distributor; the sleeve housing is connected to the left side of the inner cylinder of the distributor through an auxiliary nozzle, and the sleeve housing is connected to the diversion and guiding channel through an auxiliary nozzle; the inner cylinder of the distributor is connected to the coal slime water pipeline; the auxiliary connecting pipe is connected to the sleeve housing; the outer shell is fitted and fixed on the inner cylinder of the mixer; the spray chamber is connected to the inner cylinder of the mixer through a nozzle; the spray connecting pipe is installed on the outer shell and connected to the spray chamber; the diversion and guiding channel is connected to the inner cylinder of the mixer, and the inner cylinder of the mixer is connected to the coal slime dewatering machine; the booster water tank is connected to the booster water pump, the booster water pump is connected to the coal slime dewatering machine, and the booster water branch pipeline is connected to the booster water main pipeline; both the auxiliary connecting pipe and the spray connecting pipe are connected to the booster water branch pipeline.

Description

Technical Field

[0001] This invention relates to an ultra-high pressure dewatering and conveying system for coal slime and its working method. Background Technology

[0002] The coal industry is a crucial foundation for national economic development and a fundamental industry related to the national economy and people's livelihood. With the rapid development of the national economy, coal production has become the world's largest. In 2022, China's raw coal production reached 4.56 billion tons, a year-on-year increase of 9%, setting a new historical record. National coal consumption increased by 4.3%, accounting for 56.2% of the country's total energy consumption. From January to June 2023, China's cumulative raw coal production reached 2193.507 million tons, a cumulative increase of 11%. Based on the dual goals of ensuring national energy security and addressing climate change, coal will remain my country's primary energy source for some time to come. As the proportion of raw coal processed in my country continues to increase, the emissions of byproducts—such as coal gangue and coal slime, which are low-calorific-value coal fuels—are also increasing. In the future, with the growth of coal production and further increases in the processing rate, the generation of low-calorific-value coal fuels such as coal gangue and coal slime will further increase. my country's coal slime production increased from 150 million tons in 2012 to 215 million tons in 2022, while coal slime utilization increased from 28 million tons in 2012 to 51 million tons in 2022. However, the overall utilization rate of coal slime in my country is generally below 25%, with large amounts of coal slime being dumped and landfilled in gullies and valleys, wasting resources, occupying land, and polluting the environment. Vigorously developing comprehensive utilization technologies for low-calorific-value coal slime and realizing large-scale resource utilization of low-calorific-value coal fuels such as coal slime and coal gangue is of great significance for improving the clean, efficient, and green development level of my country's coal industry and promoting green and high-quality industrial development.

[0003] With increasingly stringent environmental requirements and standards, coal slime storage is becoming more and more difficult. Some coal preparation plants have had to limit or shut down production because they cannot handle coal slime. Therefore, the effective disposal of coal slime has become a problem that plagues coal enterprises.

[0004] The state has further clarified the need to "promote the clean, low-carbon, safe and efficient use of energy," which has raised the requirements for improving the clean and efficient use of coal. The requirements for the quality of coal products at the end-consumer stage have also increased under the conditions of environmental protection emissions, dual control of energy and carbon emission reduction. Improving the utilization efficiency of coal slime can reduce the proportion of coal energy consumption in order to achieve carbon reduction goals.

[0005] The difficulties in coal slime treatment mainly lie in the following two aspects:

[0006] (1) The high moisture content of coal slime results in a low calorific value;

[0007] (2) The high viscosity of coal slime makes it easy to clump and clog, making transportation difficult. Summary of the Invention

[0008] The purpose of this invention is to overcome the above-mentioned shortcomings in the prior art and to provide a reasonably designed coal slime ultra-high pressure dewatering and conveying system and its working method, which solves the problems of high coal slime moisture content and difficult conveying.

[0009] The technical solution adopted by this invention to solve the above problems is: a coal slime ultra-high pressure dewatering and conveying system, characterized in that: it includes a coal slime water storage silo, a main dewatering and conveying system, and a pressurization system; the main dewatering and conveying system includes a coal slime conveying pump, an auxiliary distributor, a jet mixer, a coal slime dewatering machine, a toothed roller crusher, and a finished coal slime yard; the outlet of the coal slime water storage silo is connected to the inlet of the coal slime conveying pump, and the outlet of the coal slime conveying pump is connected to the coal slime water pipeline; the dry coal slime outlet of the coal slime dewatering machine is connected to the inlet of the toothed roller crusher, and the outlet of the toothed roller crusher is connected to the finished coal slime yard; the auxiliary distributor includes a distributor inner cylinder, a sleeve shell, an auxiliary connecting pipe, and an inner cone; the distributor inner cylinder is fixedly installed inside the sleeve shell; the inner cone is fixed inside the distributor inner cylinder, dividing the right side of the distributor inner cylinder into at least two diversion and guiding channels; the distributor inner cylinder is provided with auxiliary spray holes and auxiliary spray holes. The sleeve shell is connected to the left side of the distributor inner cylinder through an auxiliary nozzle, and the sleeve shell is also connected to the diversion and guiding channel through an auxiliary nozzle. The inlet of the distributor inner cylinder is connected to the coal slurry water pipeline; the outlet of the auxiliary nozzle is connected to the sleeve shell. The jet mixer includes a mixer inner cylinder, an outer shell, and a jet nozzle. The outer shell is fitted and fixed onto the mixer inner cylinder, forming a jet chamber between the outer shell and the mixer inner cylinder. Nozzles are provided on the mixer inner cylinder, and the jet chamber is connected to the mixer inner cylinder through the nozzles. The jet nozzle is installed on the outer shell, and the jet connection... The outlet of the pipe is connected to the jet chamber; the outlet of the diversion and guiding channel is connected to the inlet of the mixer inner cylinder, and the outlet of the mixer inner cylinder is connected to the coal slime water inlet of the coal slime dewatering machine; the pressurization system includes a pressurization water tank, a pressurization water pump, a main pressurization water pipeline, and a pressurization water branch pipeline; the outlet of the pressurization water tank is connected to the inlet of the pressurization water pump, the outlet of the pressurization water pump is connected to the pressurization water inlet of the coal slime dewatering machine through the main pressurization water pipeline, and the pressurization water branch pipeline is connected to the main pressurization water pipeline; the auxiliary connection pipe and the jet connection pipe are both connected to the pressurization water branch pipeline.

[0010] The present invention describes a return pipeline connected to the return port of a coal slurry water storage silo, the return pipeline being connected to a coal slurry water pipeline, and a conveying return valve installed on the return pipeline.

[0011] The invention also includes a discharge belt conveyor and a transfer belt conveyor. The dry coal slime outlet of the coal slime dewatering machine is connected to the inlet of the toothed roll crusher via the discharge belt conveyor, and the outlet of the toothed roll crusher is connected to the finished coal slime yard via the transfer belt conveyor.

[0012] The coal slurry water storage silo of the present invention is equipped with a stirrer and an aeration device; the stirring blades of the stirrer are arranged in a tree-like pattern; the aeration device is arranged in a ring shape.

[0013] The invention also includes a vacuum system, which comprises a vacuum water tank and a vacuum water pump; the outlet of the vacuum water tank is connected to the inlet of the vacuum water pump, and the outlet of the vacuum water pump is connected to the main pressurized water pipeline.

[0014] The invention also includes a cleaning system, which includes a cleaning water tank and a cleaning water pump; the outlet of the cleaning water tank is connected to the inlet of the cleaning water pump, and the outlet of the cleaning water pump is connected to the cleaning water inlet of the coal slime dewatering machine.

[0015] The present invention also includes an air-assisted system, which includes an air compressor, an air dryer, and an air storage tank; the outlet of the air compressor is connected to the inlet of the air dryer, the outlet of the air dryer is connected to the inlet of the air storage tank, and the outlet of the air storage tank is connected to the air purging port of the coal slime dewatering machine and the air inlet of the aeration device, respectively.

[0016] The present invention also includes a sewage system, which includes a sewage ditch and a sewage collection tank. The sewage outlets of the coal slime dewatering machine, the coal slime water storage silo, and the pressurized water tank are respectively connected to the sewage ditch, and the sewage ditch is connected to the sewage collection tank.

[0017] The present invention provides a drain outlet at the lower end of the jet chamber, and the drain outlet is sealed with a chamber drain plug.

[0018] A method for operating a coal slime ultra-high pressure dewatering and conveying system, characterized by the following steps:

[0019] (1) Coal slurry from the coal washing plant is transported to the coal slurry storage silo for temporary storage until use;

[0020] (2) The coal slurry water in the coal slurry water storage bin is transported to the coal slurry water pipeline by the coal slurry water conveying pump, and then enters the inner cylinder of the distributor of the auxiliary distributor;

[0021] (3) The water in the booster tank is boosted to more than 10MPa by the booster pump, and then sent to the main booster water pipeline. The water then enters the booster water inlet and the booster water branch pipeline of the coal slime dewatering machine from the main booster water pipeline. The ultra-high pressure booster water in the booster water branch pipeline is then input into the auxiliary connection pipe and the jet connection pipe.

[0022] In the booster distributor, ultra-high pressure boosted water is ejected at high speed from the booster nozzle and auxiliary nozzle, and is fully mixed with the coal slurry water conveyed in the inner cylinder of the distributor to form a homogeneous mixture, which is then conveyed into the inner cylinder of the jet mixer from the outlet of the diversion guide channel.

[0023] In the jet mixer, ultra-high pressure boosted water is ejected at high speed from the nozzle and fully mixed with the coal slurry water conveyed in the inner cylinder of the distributor to form a homogeneous mixture, which is then conveyed into the coal slurry dewatering machine through the outlet of the inner cylinder of the mixer.

[0024] (4) The coal slime after deep dewatering by the coal slime dewatering machine is transferred by the unloading belt conveyor, crushed by the toothed roller crusher, and then transported to the finished coal slime yard for storage as power coal.

[0025] Compared with the prior art, the present invention has the following advantages and effects:

[0026] 1) Coal slime can be deeply dehydrated, enabling its commercial use as thermal coal and its cogeneration through pure CFB combustion. Ultra-high pressure deep dehydration of coal slime and pure CFB combustion for cogeneration are the main methods for large-scale resource-based treatment of low-calorific-value coal slime resources. This allows for the large-scale and rapid utilization of coal slime, improving the overall utilization value of coal. Currently, the capacity of low-calorific-value coal-fired power generation units in my country accounts for a very low proportion of the country's total installed thermal power capacity. Therefore, vigorously developing low-calorific-value coal-fired power generation is urgent and has great market potential.

[0027] 2) The system adopts a fully automatic control mode and operates automatically;

[0028] 3) After deep dewatering, the moisture content of coal slime can be controlled within 18%, and it can be used directly as power coal;

[0029] 4) The water in the booster tank is pressurized to over 10MPa by the booster pump. The ultra-high pressure water enters the auxiliary distributor and the jet mixer. The auxiliary distributor and the jet mixer solve the problems of coal slurry diversion and easy blockage during coal slurry transportation. The auxiliary distributor uses a high-pressure auxiliary method to make the mixing more uniform. The dual-diversion structure makes the distribution more uniform and less prone to blockage. It effectively solves the problems of high viscosity, easy blockage, easy agglomeration, and uneven distribution in the coal slurry pipeline transportation process. The jet mixer sprays high pressure, mixes evenly, is not easy to block, is not easy to wear, is not easy to agglomerate, and has low pollution. It effectively solves the problems of insufficient stability and reliability in the coal slurry pipeline transportation process.

[0030] 5) It can achieve fully enclosed operation, and the on-site environment is relatively good;

[0031] 6) The particle size of coal slime water is in the range of 0~3mm, which solves the problem of handling coarse and fine coal slime in the coal washing and beneficiation process. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram of the front cross-sectional structure of the power distributor according to an embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram of the front cross-sectional structure of the jet mixer according to an embodiment of the present invention. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0036] The embodiments of the present invention include a coal slurry water storage bin 2, a dewatering and conveying main system, a pressurization system, a vacuum system, a cleaning system, an air-assisted system, and a sewage discharge system.

[0037] The coal slurry storage silo 2 is lined with high-polymer PTFE wear-resistant and corrosion-resistant lining. The top is equipped with a feed inlet, a return outlet, a continuous level gauge, and four agitators 33 with tree-like blades for better mixing. An overflow outlet is located on the upper side of the silo, and a discharge outlet and a sludge outlet are located at the bottom for material outflow and sludge discharge. Two rings of aeration devices 41 are arranged in a circular pattern in the middle and bottom of the coal slurry storage silo 2. Twenty-four streamlined aeration nozzles 32 are evenly arranged along the upper edge of each aeration device 41. The aeration devices 41 and agitators 33 in the coal slurry storage silo 2 prevent coal slurry from clumping, are less prone to clogging, and allow for long-term storage.

[0038] The main dewatering and conveying system includes a coal slime conveying pump 3, a conveying shut-off valve 4, a conveying return valve 5, an auxiliary distributor 6, a jet mixer 8, a coal slime dewatering machine 10, a discharge belt conveyor 27, a toothed roller crusher 28, a transfer belt conveyor 29, and a finished coal slime yard 30.

[0039] The coal slime dewatering machine 10 is equipped with a coal slime water inlet, a booster water inlet, a cleaning water inlet, an air purging port, a wastewater outlet, and a dry coal slime outlet. The outlet of the coal slime water storage silo 2 is connected to the inlet of the coal slime conveying pump 3. The outlet of the coal slime conveying pump 3 is connected to the inlet of the auxiliary distributor 6 via a coal slime water pipeline 36. A conveying shut-off valve 4 is installed on the coal slime water pipeline 36. A return pipeline 37 is connected to the return port of the coal slime water storage silo 2, and the return pipeline is connected to the coal slime water pipeline 36. A conveying return valve 5 is installed on the return pipeline 37. The outlet of the auxiliary distributor 6 is connected to the inlet of the jet mixer 8, and the outlet of the jet mixer 8 is connected to the coal slime water inlet of the coal slime dewatering machine 10. The dry coal slime outlet of the coal slime dewatering machine 10 is connected to the inlet of the toothed roll crusher 28 via a discharge conveyor belt 27. The outlet of the toothed roll crusher 28 is connected to the finished coal slime yard 30 via a transfer conveyor belt 29.

[0040] The pressurization system is set up at the pressurization water inlet of the coal slime dewatering machine 10. The pressurization system includes a pressurization water tank 11, a pressurization water pump 12, a pressurization shut-off valve 13, a pressurization overflow valve 14, a pressurization diversion valve 15, a pressurization inlet valve 16, a high-pressure booster valve 7, a high-pressure jet valve 9, an overflow pressurization pump 38, a main pressurization water pipeline 39, and a pressurization water branch pipeline 40.

[0041] The outlet of the booster water tank 11 is connected to the inlet of the booster water pump 12. The outlet of the booster water pump 12 is connected to the inlet of the booster shut-off valve 13. The outlet of the booster shut-off valve 13 is connected to the booster water inlet of the coal slime dewatering machine 10 via the main booster water pipeline 39. A booster inlet valve 16 is installed on the main booster water pipeline 39. A booster branch pipeline 40 is connected to the main booster water pipeline 39. A booster diversion valve 15 is installed on the booster branch pipeline 40. The outlet of the booster water tank 11 is connected to the inlet of the overflow booster pump 38. The outlet of the overflow booster pump 38 is connected to the inlet of the booster overflow valve 14. The outlet of the booster overflow valve 14 is connected to the overflow inlet of the booster water tank 11.

[0042] The auxiliary distributor 6 includes an inlet flange 61, a distributor inner cylinder 62, a cavity front sealing plate 63, a sleeve housing 64, an auxiliary water inlet flange 65, an auxiliary pipe 66, an inner cavity cone 69, and a diversion outlet flange 610.

[0043] The inner cylinder 62 of the distributor is fixedly installed inside the sleeve housing 64. The inlet of the inner cylinder 62 extends out from the sleeve housing 64, and the inlet flange 61 is fixedly installed at the inlet of the inner cylinder 62. The front sealing plate 63 of the cavity is fixedly installed on the left end of the sleeve housing 64 and the inner cylinder 62, sealing the left end of the sleeve housing 64. The right side of the inner cylinder 62 is funnel-shaped, and the inner cone 69 is fixed to the right side of the inner cylinder 62, dividing the right side of the inner cylinder 62 into at least two diversion and guiding channels 612. The outlets of these diversion and guiding channels 612 are all equipped with diversion outlet flanges 610. The inner cone 69 is a wear-resistant conical solid cylinder. The inner cylinder 62 of the distributor is provided with auxiliary spray holes 68 and secondary spray holes 67. The sleeve housing 64 is connected to the left side of the inner cylinder 62 of the distributor through the secondary spray holes 67, and the sleeve housing 64 is connected to the diversion and guiding channel 612 through the auxiliary spray holes 68. There are multiple auxiliary spray holes 68, arranged in three rings, with eight auxiliary spray holes in each ring. The auxiliary spray holes 68 are figure-eight shaped holes, with the diameter reduced from Φ12mm to Φ6mm, and are inclined, forming an angle of 12° with the center line of the inner cylinder 62 of the distributor. There are eight secondary spray holes 67, arranged in one ring. The secondary spray holes 67 are figure-eight shaped holes, with the diameter reduced from Φ16mm to Φ8mm, and are inclined, forming an angle of 24° with the center line of the inner cylinder 62 of the distributor. The auxiliary inlet flange 65 is fixedly installed at the inlet of the auxiliary pipe 66, and the outlet of the auxiliary pipe 66 is connected to the sleeve housing 64. The inlet of the distributor inner cylinder 62 is connected to the coal slurry water pipeline 36 through the inlet flange 61. The auxiliary pipe 66 is connected to the booster water branch pipeline 40 through the high-pressure booster valve 7.

[0044] The jet mixer 8 includes an inlet flange 81, a mixer inner cylinder 82, an outer shell, a high-pressure jet flange 85, a jet pipe 86, an outlet flange 88, and a chamber drain plug 810.

[0045] An inlet flange 81 is fixedly installed at the inlet of the mixer inner cylinder 82, and an outlet flange 88 is fixedly installed at the outlet of the mixer inner cylinder 82. An outer shell is fitted and fixedly installed on the mixer inner cylinder 82, with both the left and right ends of the outer shell sealed. A complete jet chamber 811 is formed between the outer shell and the mixer inner cylinder 82. A drain port is provided at the lower end of the jet chamber 811, and the drain port is sealed with a chamber drain plug 810. The outer shell includes a chamber baffle 83, a left shell 84, and a right shell 87. The right shell 87 is fitted onto the mixer inner cylinder 82, and its right end is fixed to the mixer inner cylinder 82, thus sealing the right end of the outer shell. The right shell 87 is trumpet-shaped. The left shell 84 is fitted onto the mixer inner cylinder 82, and its right end is welded and fixed to the right end of the right shell 87. The chamber baffle 83 is fixedly installed on the left end of the left shell 84 and the mixer inner cylinder 82, sealing the left end of the left shell 84, thus sealing the left end of the outer shell. A nozzle 89 is provided on the inner cylinder 82 of the mixer. The jet chamber 811 is connected to the inner cylinder 82 of the mixer through the nozzle 89. The nozzle 89 is used for jet mixing during the conveying of coal slurry to prevent coal slurry deposition and blockage. There are multiple nozzles 89, arranged in three rings, with six nozzles in each ring. The nozzles 89 are streamlined, smooth, throat-shaped orifices, with the orifice diameter decreasing from Φ20mm to Φ4mm and then increasing to Φ8mm. The nozzles 89 are inclined, forming an angle of 36° with the centerline of the inner cylinder 82 of the mixer. A high-pressure jet flange 85 is fixedly installed at the inlet of the jet pipe 86, which is installed on the left shell 84 of the outer casing. The outlet of the jet pipe 86 is connected to the jet chamber 811. The outlet of a diversion material guide channel 612 is connected to the inlet of the mixer inner cylinder 82 of a jet mixer 8 via a pipeline. The outlet of the mixer inner cylinder 82 is connected to the coal slime water inlet of the coal slime dewatering machine 10 via a pipeline. The jet pipe 86 is connected to the pressurized water branch pipeline 40 via a high-pressure jet valve 9.

[0046] The pressurized water inlet of the coal slime dewatering machine 10 is equipped with a vacuum system, including a vacuum water tank 17, a vacuum water pump 18, and a vacuum shut-off valve 19. The outlet of the vacuum water tank 17 is connected to the inlet of the vacuum water pump 18, and the outlet of the vacuum water pump 18 is connected to the main pressurized water pipeline 39 through the vacuum shut-off valve 19.

[0047] A cleaning system is installed at the cleaning water inlet of the coal slime dewatering machine 10, including a cleaning water tank 20, a cleaning water pump 21, and a cleaning shut-off valve 22. The outlet of the cleaning water tank 20 is connected to the inlet of the cleaning water pump 21, and the outlet of the cleaning water pump 21 is connected to the cleaning water inlet of the coal slime dewatering machine 10 through the cleaning shut-off valve.

[0048] The coal slime water storage silo 2 and the coal slime dewatering machine 10 are equipped with an air-assisted system, including an air compressor 23, an air dryer 24, an air storage tank 25, an air purge valve 26, and an aeration shut-off valve 31. The outlet of the air compressor 23 is connected to the inlet of the air dryer 24, and the outlet of the air dryer 24 is connected to the inlet of the air storage tank 25. The air storage tank 25 is equipped with a safety valve, a pressure gauge, and a drain valve. The outlet of the air storage tank 25 is connected to the air purge port of the coal slime dewatering machine 10 and the air inlet of the aeration device 41, respectively. An air purge valve 26 is installed on the air purge port of the coal slime dewatering machine 10. An aeration shut-off valve 31 is installed at the air inlet of the aeration device 41.

[0049] The coal slime ultra-high pressure dewatering and conveying system is equipped with a sewage discharge system, including a sewage discharge ditch 34 and a sewage collection tank 35. The sewage discharge outlets of the coal slime dewatering machine 10, the coal slime water storage tank 2, the vacuum water tank 17, the pressurization water tank 11, and the cleaning water tank 20 are respectively connected to the sewage discharge ditch 34. The sewage discharge ditch 34 is connected to the sewage collection tank 35. The sewage discharged from the sewage collection tank 35 is centrally transported to the sewage treatment plant for treatment and recycling.

[0050] A method for operating a coal slime ultra-high pressure dewatering and conveying system, characterized by the following steps:

[0051] (1) Coal slurry with a moisture content of 50% to 90% from the coal washing plant is transported to coal slurry storage silo 2 for temporary storage until use.

[0052] (2) The coal slurry water with a moisture content of 50% to 90% in the coal slurry water storage bin 2 is transported to the coal slurry water pipeline 36 by the coal slurry water conveying pump 3, and then enters the inner cylinder 62 of the distributor of the auxiliary distributor 6.

[0053] (3) A multi-stage auxiliary distributor 6 and a jet mixer 8 are installed in front of the coal slime dewatering machine 10 to solve the problem of easy blockage during coal slime water flow and transportation.

[0054] The water in the booster water tank 11 is boosted to more than 10MPa by the booster water pump 12, and then sent into the booster water main pipeline 39. From the booster water main pipeline 39, it enters the booster water inlet and booster water branch pipeline 40 of the coal slime dewatering machine 10. The ultra-high pressure booster water of more than 10MPa in the booster water branch pipeline 40 is then input into the auxiliary connection pipe 66 and the jet connection pipe 86.

[0055] In the booster distributor 6, pressurized water is sprayed out at high speed and evenly from three rings of booster nozzles 68 and one ring of auxiliary nozzles 67, and is fully mixed with the coal slurry water conveyed in the inner cylinder 62 of the distributor to form a homogeneous mixture, thereby ensuring that the coal slurry water is stably and evenly conveyed from the outlet of the diversion and guiding channel 612 into the inner cylinder 82 of the jet mixer 8.

[0056] In the jet mixer 8, pressurized water is sprayed out at high speed and uniformly from the nozzle 89, and is fully mixed with the coal slime conveyed in the inner cylinder 82 of the distributor to form a homogeneous mixture, thereby ensuring that the coal slime is stably and uniformly conveyed through the outlet of the inner cylinder 82 of the mixer into the coal slime dewatering machine 10 for deep dewatering.

[0057] (4) Coal slime with a moisture content of ≤18% after deep dewatering by coal slime dewatering machine 10 is transferred by unloading belt conveyor 27, crushed to a particle size of less than 30mm by toothed roller crusher 28, and then transported to finished coal slime yard 30 for storage as power coal for later use.

[0058] (5) The wastewater from coal slime dewatering machine 10, coal slime water storage bin 2, vacuum water tank 17, pressurization water tank 11, and cleaning water tank 20 flows by gravity to the wastewater ditch 34. The wastewater from the wastewater ditch 34 is collected to the wastewater collection pool 35 and then transported to the wastewater treatment station for treatment and recycling.

[0059] Furthermore, it should be noted that the specific embodiments described in this specification may differ in the shape and name of their components, etc. The above description is merely illustrative of the structure of the present invention. All equivalent or simple variations made based on the structure, features, and principles described in this patent concept are included within the protection scope of this patent. Those skilled in the art can make various modifications or additions to the described specific embodiments or use similar methods to substitute them, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, all of which should fall within the protection scope of this invention.

Claims

1. A coal slime ultra-high pressure dewatering and conveying system, characterized in that: The system includes a coal slurry water storage silo, a main dewatering and conveying system, and a pressurization system. The main dewatering and conveying system includes a coal slurry conveying pump, an auxiliary distributor, a jet mixer, a coal slurry dewatering machine, a toothed roller crusher, and a finished coal slurry yard. The outlet of the coal slurry water storage silo is connected to the inlet of the coal slurry conveying pump, and the outlet of the coal slurry conveying pump is connected to the coal slurry water pipeline. The dry coal slurry outlet of the coal slurry dewatering machine is connected to the inlet of the toothed roller crusher, and the outlet of the toothed roller crusher is connected to the finished coal slurry yard. The auxiliary distributor includes a distributor inner cylinder, a sleeve housing, an auxiliary connecting pipe, and an inner cone. The distributor inner cylinder is fixedly installed inside the sleeve housing. The inner cone is fixed inside the distributor inner cylinder, dividing the right side of the distributor inner cylinder into at least two diversion and guiding channels. The distributor inner cylinder is equipped with auxiliary spray holes and secondary spray holes. The sleeve shell is connected to the left side of the distributor inner cylinder through an auxiliary nozzle, and the sleeve shell is also connected to the diversion and guiding channel through an auxiliary nozzle. The inlet of the distributor inner cylinder is connected to the coal slurry water pipeline; the outlet of the auxiliary nozzle is connected to the sleeve shell. The jet mixer includes a mixer inner cylinder, an outer shell, and a jet nozzle. The outer shell is fitted and fixed onto the mixer inner cylinder, forming a jet chamber between the outer shell and the mixer inner cylinder. Nozzles are provided on the mixer inner cylinder, and the jet chamber is connected to the mixer inner cylinder through the nozzles. The jet nozzle is installed on the outer shell, and the jet connection... The outlet of the pipe is connected to the jet chamber; the outlet of the diversion and guiding channel is connected to the inlet of the mixer inner cylinder, and the outlet of the mixer inner cylinder is connected to the coal slime water inlet of the coal slime dewatering machine; the pressurization system includes a pressurization water tank, a pressurization water pump, a main pressurization water pipeline, and a pressurization water branch pipeline; the outlet of the pressurization water tank is connected to the inlet of the pressurization water pump, the outlet of the pressurization water pump is connected to the pressurization water inlet of the coal slime dewatering machine through the main pressurization water pipeline, and the pressurization water branch pipeline is connected to the main pressurization water pipeline; the auxiliary connection pipe and the jet connection pipe are both connected to the pressurization water branch pipeline.

2. The coal slime ultra-high pressure dewatering and conveying system according to claim 1, characterized in that: The coal slurry water storage silo is connected to a return pipe at the return port, and the return pipe is connected to the coal slurry water pipeline. A conveying return valve is installed on the return pipe.

3. The coal slime ultra-high pressure dewatering and conveying system according to claim 1, characterized in that: It also includes a discharge belt conveyor and a transfer belt conveyor. The dry coal slime outlet of the coal slime dewatering machine is connected to the inlet of the toothed roll crusher through the discharge belt conveyor, and the outlet of the toothed roll crusher is connected to the finished coal slime yard through the transfer belt conveyor.

4. The coal slime ultra-high pressure dewatering and conveying system according to claim 1, characterized in that: The coal slurry water storage silo is equipped with a stirrer and an aeration device; the stirring blades of the stirrer are arranged in a tree-like pattern; and the aeration device is arranged in a ring.

5. The coal slime ultra-high pressure dewatering and conveying system according to claim 1, characterized in that: It also includes a vacuum system, which consists of a vacuum water tank and a vacuum water pump; the outlet of the vacuum water tank is connected to the inlet of the vacuum water pump, and the outlet of the vacuum water pump is connected to the main pressurized water pipeline.

6. The coal slime ultra-high pressure dewatering and conveying system according to claim 1, characterized in that: It also includes a cleaning system, which consists of a cleaning water tank and a cleaning water pump; the outlet of the cleaning water tank is connected to the inlet of the cleaning water pump, and the outlet of the cleaning water pump is connected to the cleaning water inlet of the coal slime dewatering machine.

7. The coal slime ultra-high pressure dewatering and conveying system according to claim 4, characterized in that: It also includes an air-assisted system, which includes an air compressor, an air dryer, and an air storage tank; the outlet of the air compressor is connected to the inlet of the air dryer, the outlet of the air dryer is connected to the inlet of the air storage tank, and the outlet of the air storage tank is connected to the air purging port of the coal slime dewatering machine and the air inlet of the aeration device, respectively.

8. The coal slime ultra-high pressure dewatering and conveying system according to claim 1, characterized in that: It also includes a sewage system, which consists of a sewage ditch and a sewage collection tank. The sewage outlets of the coal slime dewatering machine, the coal slime water storage silo, and the pressurized water tank are connected to the sewage ditch, which is connected to the sewage collection tank.

9. The coal slime ultra-high pressure dewatering and conveying system according to claim 1, characterized in that: A drain outlet is provided at the lower end of the jet chamber, and the drain outlet is sealed with a chamber drain plug.

10. A method of operating the coal slime ultra-high pressure dewatering and conveying system according to any one of claims 1-9, characterized in that: The steps are as follows: (1) Coal slurry from the coal washing plant is transported to the coal slurry storage silo for temporary storage until use; (2) The coal slurry water in the coal slurry water storage bin is transported to the coal slurry water pipeline by the coal slurry water conveying pump, and then enters the inner cylinder of the distributor of the auxiliary distributor; (3) The water in the booster tank is boosted to more than 10MPa by the booster pump, and then sent to the main booster water pipeline. The water then enters the booster water inlet and the booster water branch pipeline of the coal slime dewatering machine from the main booster water pipeline. The ultra-high pressure booster water in the booster water branch pipeline is then input into the auxiliary connection pipe and the jet connection pipe. In the booster distributor, ultra-high pressure boosted water is ejected at high speed from the booster nozzle and auxiliary nozzle, and is fully mixed with the coal slurry water conveyed in the inner cylinder of the distributor to form a homogeneous mixture, which is then conveyed into the inner cylinder of the jet mixer from the outlet of the diversion guide channel. In the jet mixer, ultra-high pressure boosted water is ejected at high speed from the nozzle and fully mixed with the coal slurry water conveyed in the inner cylinder of the distributor to form a homogeneous mixture, which is then conveyed into the coal slurry dewatering machine through the outlet of the inner cylinder of the mixer. (4) The coal slime after deep dewatering by the coal slime dewatering machine is transferred by the unloading belt conveyor, crushed by the toothed roller crusher, and then transported to the finished coal slime yard for storage as power coal.

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