Coal slurry concentration comprehensive treatment system based on multi-module cooperation

Abstract

This utility model discloses a multi-module collaborative coal slurry thickening and comprehensive treatment system. The raw coal silo is connected to the inlet of a weighing feeder, and the bottom outlet of the weighing feeder is connected to the mill via a mill feed pipe. The mill outlet is connected to a primary drum screen, and the bottom outlet of the primary drum screen is connected to the mill discharge trough via a primary drum screen coal slurry guide pipe. The bottom outlet of the mill discharge trough is connected to a secondary drum screen via a low-pressure coal slurry pump, and the bottom outlet of the secondary drum screen is connected to a coal slurry trough via a secondary drum screen coal slurry guide pipe. The bottom outlet of the coal slurry trough is connected to a gasifier via a high-pressure coal slurry pump. Through optimized particle size distribution via circulating grinding, reduced viscosity via steam heating, suppression of overflow via screening structure, and control of non-lubricating residual moisture via flash steam emission, the coal slurry concentration is increased to 64.5%, the effective gas (CO+H2) production is increased by 1.5%, and the specific coal consumption is reduced by 12 kg / 1000 Nm³. 3 Oxygen consumption reduced by 16 Nm 3 / 1000Nm 3 CO2 emissions will be reduced by about 3.2%, and based on a synthetic ammonia plant with an annual output of 400,000 tons, the annual cost savings will be about 15.477 million yuan.

Description

Technical Field

[0001] This utility model relates to coal-water slurry preparation technology in the field of coal chemical industry. Specifically, it relates to a comprehensive treatment system and method that significantly improves coal slurry concentration and gasification efficiency through the synergistic effects of circulating grinding, temperature control, sieving optimization and flash steam emission. It is applicable to the preparation and treatment of high-concentration coal slurry in coal gasification processes. Background Technology

[0002] Raw coal is co-ground with water and additives in a coal mill to produce a slurry with a required particle size distribution and a concentration of approximately 60%-62% (normally controlled at 62%). The coal slurry overflowing from the mill passes through an outlet drum screen to remove large particles, then flows by gravity into the mill outlet trough. An agitator in the outlet trough homogenizes the slurry and keeps it in suspension. The slurry is then pumped through the outlet trough to the gasification section's coal slurry tank for gasification.

[0003] The existing coal-water slurry preparation process is constrained by the lack of synergy among multiple modules, resulting in a coal slurry concentration that is consistently lower than the ideal value (62.5%). The core problem is as follows:

[0004] Imbalance between particle size distribution and grinding efficiency: Single-pass grinding results in a unimodal structure of the coal slurry (porosity > 25%, bulk density ≤ 1.16 g / cm³). 3 The non-lubricating residual moisture content is 38%-40%, leading to increased gasification heat loss (a 5%-8% increase in specific coal / oxygen consumption and a 10%-15% increase in CO2 emissions). While adding existing ultrafine grinding technology can increase the concentration to 64%, the equipment cost surges by 30%.

[0005] Low temperature and high viscosity exacerbate slurry overflow: The viscosity of coal slurry increases sharply with temperature drop (up to 1000 mPa·s), forcing an increase in the amount of process water and coal slurry additives, resulting in a 1% decrease in coal slurry concentration (a 0.74% decrease in gas production efficiency).

[0006] Screen aperture structure defects: Analysis shows that to meet the process requirements for particle size distribution of coal-water slurry (<8 mesh 100%, <14 mesh 98%-100%, <40 mesh 93%-95%, <200 mesh 45%-58%, <325 mesh 30%-40%), the currently used drum screen uses a screen aperture size of 3.0~3.6mm (width) × 20mm (length) for control. The current drum screen (specification Ф2800*3200mm, perforated type (aperture diameter 3.5*20mm, material 316L)) has the following key bottlenecks: First, there is a contradiction between particle size control and gasification efficiency: when the screen aperture width is >3.8mm, the coal slurry particle size increases, leading to a decrease in the atomization effect of the gasifier, incomplete combustion, reduced gas production, and increased residual carbon in ash (affecting economic efficiency); coarse particles easily cause coal slurry stratification and sedimentation, increasing the risk of pipeline blockage and leading to unplanned shutdowns; large particles aggravate equipment wear and shorten the life of key components. Second, there are defects in the screen hole structure and the problem of slurry overflow: the existing screen hole (3.0mm×20mm) has insufficient effective screening area (4% of the section), resulting in high resistance to coal slurry flow; slurry blockage leads to an overflow rate of 3%-5%, which further restricts the improvement of screening efficiency and coal-water slurry concentration.

[0007] Existing screening technologies are limited by particle size control precision and structural defects, resulting in an interlocking effect of "low screening efficiency → overflow → limited concentration". It is necessary to optimize the screen aperture parameters or develop new classification technologies to break through the bottleneck.

[0008] Design flaws of the cyclone plate: The low cyclone plate (70mm) results in a short residence time of coal slurry (<10s), weak centrifugal stratification, and insufficient separation of large particles. Due to the insufficient height of the cyclone plate, a large amount of coal slurry overflows the cyclone plate and spills out of the drum screen, which increases the slurry preparation cost.

[0009] Non-lubricating residual moisture: Flash steam in the coal slurry tank is not effectively discharged, increasing the proportion of non-lubricating residual moisture in the coal slurry. Existing technologies rely on single optimizations (such as additive ratios and moisture content adjustments), which cannot systematically solve the synergistic contradiction between particle size distribution, screening efficiency, and temperature viscosity characteristics. A comprehensive enrichment technology involving multiple modules is needed. Summary of the Invention

[0010] To address the aforementioned technical problems, this utility model provides a multi-module collaborative coal slurry thickening and comprehensive treatment system. The raw coal silo is connected to the inlet of a weighing feeder, and the bottom outlet of the weighing feeder is connected to the mill via a mill feed pipe. The mill outlet is connected to a primary rotary screen, and the bottom outlet of the primary rotary screen is connected to the mill discharge trough via a primary rotary screen coal slurry guide pipe. The bottom outlet of the mill discharge trough is connected to a secondary rotary screen via a low-pressure coal slurry pump, and the bottom outlet of the secondary rotary screen is connected to a coal slurry trough via a secondary rotary screen coal slurry guide pipe. The bottom outlet of the coal slurry trough is connected to a gasifier via a high-pressure coal slurry pump.

[0011] The mill feed pipe is equipped with a coal pulverizing water pipeline, an additive inlet pipeline, and a low-pressure steam pipeline, and is sequentially equipped with a coal pulverizing water valve, an additive valve, and a low-pressure steam pipeline.

[0012] The bottom outlet of the primary drum screen is connected to the inlet of the waste coal slurry pool via a pipe, and the outlet of the waste coal slurry pool is connected to another inlet of the weighing feeder.

[0013] The bottom outlet of the mill discharge trough is connected to another inlet of the weighing feeder via a low-pressure coal slurry pump, the low-pressure coal slurry pump outlet pipeline, and the circulating grinding pipeline.

[0014] The top of the coal slurry tank is connected to the flash steam exhaust fan via a flash steam exhaust bend.

[0015] The bottom outlet of the flash steam discharge bend is connected to the inlet of the condensate water seal tank via a condensate guide pipe.

[0016] The overflow port of the condensate guide pipe is connected to the overflow pipe of the condensate water seal tank.

[0017] The screen aperture size of the primary or secondary drum screen is 3.0mm × 40mm, and the height of the cyclone plate inside the drum screen is 100mm.

[0018] This utility model also provides a comprehensive coal slurry concentration treatment method based on multi-module collaboration, including the following steps:

[0019] (1) Raw material proportioning and pretreatment: Raw coal enters the weighing feeder, is mixed with water and additives, and then sent to the mill for grinding to obtain coal slurry;

[0020] (2) After the coal slurry is separated into large particles by the primary drum screen, it flows by gravity to the mill discharge trough. The circulation ratio is controlled by the low-pressure coal slurry pump, and it returns to the mill for secondary grinding through the circulating grinding pipeline.

[0021] (3) The uncirculated coal slurry is sent to the secondary drum screen for screening;

[0022] (4) The material screened by the secondary drum screen enters the coal slurry tank, and the bottom of the coal slurry tank sends the material to the gasifier.

[0023] In some embodiments, a circulating grinding pipeline is connected to the pipeline after the outlet valve of the low-pressure coal slurry pump, and the outlet of the circulating grinding pipeline is set at the feed port of the weighing feeder, which facilitates the return of the circulating coal slurry to the mill for re-grinding to increase the fine particles of the coal slurry. In order to achieve the above purpose, this utility model patent provides a bi-peak graded circulating grinding pipeline to increase the coal slurry concentration. The outlets of the low-pressure coal slurry pump and the feed port of the weighing feeder at both ends of the circulating grinding pipeline are equipped with flow control valves and flushing water valves to achieve 10-20% adjustment of the total coal slurry circulation volume; the uncirculated coal slurry is sent to the secondary drum screen; the material screened by the secondary drum screen enters the coal slurry tank, and the bottom of the coal slurry tank sends the material to the gasifier.

[0024] Under the above grinding conditions, the material is ground through a mill circulation grinding pipeline until the proportion of coarse particles (150-200μm) is 40-50% and the proportion of fine particles (15-20μm) is 20-30%, forming a bimodal distribution and a denser packing structure.

[0025] In the preferred embodiment, the grinding process is carried out under the above-mentioned grinding conditions through a mill circulation grinding pipeline until the proportion of coarse particles (150-200μm) is 43% and the proportion of fine particles (15-20μm) is 23%, forming a bimodal gradation overall.

[0026] Steam is injected into the mill inlet using a low-pressure steam pipeline at a pressure of 0.3-0.5 MPa, a temperature of 130℃-140℃, and a flow rate of 4-6 tons / h. The coal slurry temperature is controlled in real time to maintain between 55℃ and 70℃. At this temperature, the viscosity is reduced to below 551 mPa·s based on a viscosity-temperature model (μ=-5.12T+909.4), thereby improving the coal slurry screening rate.

[0027] The novel screen aperture structure for a coal-water slurry drum screen optimizes the aperture size from the existing 3.0mm×20mm to 3.0mm×40mm, doubling the aperture length while maintaining the original aperture width. This improvement significantly expands the screening area, effectively solving the problems of high overflow rate (3%-5%) and low screening efficiency (75%) caused by insufficient screening area in traditional screens. The optimized aperture structure improves the fluidity of the coal slurry, increases the screening efficiency to over 95%, reduces the overflow rate to below 1%, and increases the coal slurry concentration by over 0.5%, ideally by over 1%.

[0028] The drum screen is equipped with multiple layers of swirl plates, each 100-110mm high, made of 304L stainless steel. Extending the coal slurry residence time to 5-10 seconds reduces the overflow rate to <1%.

[0029] In some preferred cases, the screen aperture size of the secondary drum screen is 3.0mm × 40mm, and the height of the cyclone plate inside the drum screen is 100mm.

[0030] By adding a blower exhaust pipe and a condensate drain pipe, the moisture content of the coal slurry is effectively reduced, and the slurry concentration is increased. The system includes a coal slurry tank, a blower, a condensate drain pipe, a stirrer, and a condensate water seal. After being heated and its viscosity reduced, the coal slurry enters the coal slurry tank. The blower discharges flash steam through a DN500 exhaust pipe, the condensate drain pipe collects and discharges condensate, and the stirrer ensures uniform heating of the coal slurry. This method significantly reduces the moisture content of the coal slurry and improves the efficiency and quality of coal slurry treatment through flash steam discharge and condensate separation.

[0031] In step (1), a low-pressure coal slurry pump is used to circulate a slurry with a volume fraction of 10%-20% to the mill. The circulation pipeline is DN80, with a porosity ≤12% and a bulk density of 1.20-1.28 g / cm³. 3 .

[0032] When the circulation ratio exceeds 20%, the proportion of fine particles exceeds the critical value (V_fine / V_voids > 0.8), the coarse particle skeleton structure disintegrates, and the coal slurry performance deteriorates. Therefore, the circulation ratio should be controlled between 10% and 20%, preferably 15% to 20%.

[0033] Uncirculated coal slurry at 77-97m 3 / h enters the secondary drum screen.

[0034] The screen aperture size of the secondary drum screen is 3.0mm × (40-45)mm. The drum screen is equipped with multiple layers of swirl plates. The height of the swirl plates inside the drum screen is 100-110mm, and the material is 304L stainless steel.

[0035] In some preferred cases, the screen aperture size of the secondary drum screen is 3.0mm × 40mm, and the height of the cyclone plate inside the drum screen is 100mm.

[0036] The screen aperture size of the drum screen is optimized by extending the aperture length rather than the width. This ensures that the flow resistance of the coal slurry is not increased without changing the particle size. For example, an optimized aperture size of 3.0mm × 40mm increases the screening area by 1.6m². 2 The screening efficiency has been increased to 95%.

[0037] For example, increasing the height of the swirl plate from 70mm to 100mm effectively intercepts the coal slurry and guides the coal slurry, increasing the swirling dispersion flow path and extending the coal slurry residence time to 5-10 seconds, such as 15s-20s, which increases the screening area and reduces the overflow rate to below 1%, such as reducing the overflow rate to 0.8%, or preferably reducing the overflow rate to 0.5%.

[0038] By synergistically optimizing the screen aperture parameters and cyclone plate structure, the interlocking contradiction of "screening-overflow" in traditional drum screens is broken, improving the system's economy while ensuring the stability of coal slurry concentration.

[0039] In step (5), the flash steam at the top of the coal slurry tank is pumped out by a centrifugal fan, and the condensate flows into the water seal tank through the guide pipe.

[0040] The centrifugal fan has an air volume of 8000~10000 m³ / h and a negative pressure of -5~-10 kPa. The exhaust pipe is DN500. Combined with a condensate drain pipe and a water seal tank, the flash steam discharge efficiency is improved, reducing non-lubricating residual moisture. The condensate water seal tank has a liquid level of 350-400 mm.

[0041] The technical solution of this utility model utilizes a process of circulating grinding to optimize particle size distribution, steam heating to reduce viscosity, sieving to extend residence time, and flash steam discharge to control water content. This ultimately increases the coal slurry concentration from 62.5% to over 64%, more preferably to over 64.5%, and even more preferably to over 65%. Effective gas (CO+H2) production increases by 1.5%, and specific coal consumption decreases by 12 kg / 1000 Nm³. 3 Oxygen consumption reduced by 16 Nm 3 / 1000Nm 3 CO2 emissions will be reduced by approximately 3.2%, resulting in annual cost savings of approximately 15.477 million yuan. Attached Figure Description

[0042] Figure 1 Schematic diagram of the integrated processing system.

[0043] The diagram shows: 1. Raw coal silo; 2. Weighing feeder; 3. Mill feed pipe; 4. Mill water valve; 5. Additive valve; 6. Low-pressure steam pipeline valve; 7. Mill; 8. Primary drum screen; 9. Primary drum screen coal slurry guide pipe; 10. Primary drum screen large particle material pipe; 11. Waste coal slurry pool; 12. Agitator; 13. Mill discharge chute; 14. Low-pressure coal slurry pump inlet valve; 15. Low-pressure coal slurry pump inlet pipeline; 16. Low-pressure coal slurry pump; 17. Low-pressure coal slurry pump outlet valve; 18. Low-pressure coal slurry pump outlet pipeline; 19. Secondary drum screen inlet valve; 20. Secondary drum screen; 21. Secondary drum screen large particle material pipe; 22. Secondary drum screen coal slurry guide pipe; 23. Agitator; 24. Flash steam discharge pipe; 25. Flash steam discharge fan; 26. Condensate guide pipe; 27. Condensate water seal tank; 28. Condensate water seal tank overflow pipe; 29. ​​Coal slurry tank; 30. High-pressure coal slurry pump inlet valve. 31 High-pressure coal slurry pump inlet pipeline, 32 High-pressure coal slurry pump, 33 High-pressure coal slurry pump outlet valve, 34 High-pressure coal slurry pump outlet pipeline, 35 Circulating grinding pipeline, 36 Circulating valve 1#, 37 Circulating valve 2#, 38 Flushing water valve 1#, 39 Flushing water valve 2#, 40 Waste coal slurry return to mill control valve, 41 Waste coal slurry return to mill pipeline.

[0044] Figure 2 The viscosity-temperature linear relationship curve is shown in Example 1.

[0045] Figure 3 This is a comparison diagram of the traditional sieve aperture and the sieve aperture of this utility model.

[0046] In the figure, 1' is the width of the traditional sieve aperture, 2' is the length of the traditional sieve aperture, and 3' is the length between the traditional sieve apertures.

[0047] In the figure, 4' represents the length of the new type of sieve aperture, and 5' represents the length of the new type of sieve aperture and the sieve aperture separation.

[0048] Figure 4 Comparison diagram of traditional swirl plates and the swirl plate structure of this utility model;

[0049] In the diagram, 1-1 is a screen, 1-2 is a cyclone plate, 1-4 is a coal slurry guide pipe, and 1-5 is a mill discharge chute;

[0050] In the diagram, 2-1 is the screen, 2-2 is the swirl plate, 2-3 is the optimized swirl plate, 2-4 is the coal slurry guide pipe, and 2-5 is the mill discharge chute.

[0051] Figure 5 : Structure diagram of flash steam emission system.

[0052] In the diagram, 19 is the inlet valve of the secondary drum screen, 20 is the secondary drum screen, 21 is the large particle material pipe of the secondary drum screen, 22 is the coal slurry guide pipe of the secondary drum screen, 24 is the flash steam discharge pipe, 25 is the flash steam discharge fan, 26 is the condensate guide pipe, 27 is the condensate water seal tank, and 28 is the overflow pipe of the condensate water seal tank. Detailed Implementation

[0053] Example 1

[0054] like Figure 1 , Figure 3 B, Figure 4 B, Figure 5 The structure yields a coal slurry thickening and comprehensive treatment system based on multi-module collaboration. The raw coal silo 1 is connected to the inlet of the weighing feeder 2, and the bottom outlet of the weighing feeder 2 is connected to the mill 7 via the mill feed pipe 3.

[0055] The outlet of mill 7 is connected to primary drum screen 8, and the bottom outlet of primary drum screen 8 is connected to mill discharge chute 13 via primary drum screen coal slurry guide pipe 9.

[0056] The bottom outlet of the mill discharge trough 13 is connected to the secondary drum screen 20 via the low-pressure coal slurry pump 16, and the bottom outlet of the secondary drum screen 20 is connected to the coal slurry trough 29 via the secondary drum screen coal slurry guide pipe 22.

[0057] The bottom outlet of the coal slurry tank 29 is connected to the gasifier via a high-pressure coal slurry pump 32.

[0058] The mill feed pipe 3 is equipped with a coal grinding water pipeline, an additive inlet pipeline, and a low-pressure steam pipeline, and is sequentially equipped with a coal grinding water valve 4, an additive valve 5, and a low-pressure steam pipeline 6.

[0059] The bottom outlet of the mill discharge trough 13 is connected to another inlet of the weighing feeder 2 via the low-pressure coal slurry pump 16, the low-pressure coal slurry pump outlet pipeline 18, and the circulating grinding pipeline 35.

[0060] The bottom outlet of the mill discharge chute 13 is also connected to another inlet of the weighing feeder 2 via the low-pressure coal slurry pump 16.

[0061] The top of the coal slurry tank 29 is connected to the flash steam exhaust fan 25 via a flash steam exhaust bend 24.

[0062] The bottom outlet of the flash steam discharge bend 24 is connected to the inlet of the condensate water seal tank 27 via the condensate guide pipe 26.

[0063] The overflow port of the condensate guide pipe 26 is connected to the overflow pipe 28 of the condensate water seal tank.

[0064] The screen aperture size of the primary or secondary drum screen is 3.0mm × 40mm, and the height of the cyclone plate inside the drum screen is 100mm.

[0065] It is understandable that corresponding valves are installed on different pipelines.

[0066] Example 2

[0067] The following process is performed using the apparatus of Example 1:

[0068] Coal quality parameters: Inner Mongolia coal HGI=60, Mad=6%, Aad=9.2%.

[0069] (1) Raw material proportioning and pretreatment: Raw coal enters the weighing feeder, is mixed with water and additives (sodium lignosulfonate), and is then sent to the mill for grinding to obtain coal slurry; During the grinding process, steam is injected into the mill inlet using a low-pressure steam pipeline, with a steam pressure of 0.3-0.5MPa, a steam temperature of 130℃-140℃, and a flow rate of 4.5 tons / h, and the coal slurry temperature is adjusted to 65℃~70℃ in real time.

[0070] (2) The sodium lignin sulfonate is prepared by sulfonation modification of lignin (a natural high molecular polymer with the second highest content in nature after cellulose and chitin). It is derived from sulfite pulping waste liquid in the papermaking industry. It has good solubility and high surface activity and dispersibility. It is widely used to increase the concentration of coal slurry, reduce viscosity, and improve fluidity and stability.

[0071] (3) Circulating grinding and bimodal gradation: After the coal slurry is separated into large particles by the primary drum screen 8, it flows by gravity to the mill discharge trough 13. The circulation ratio (volume ratio of 20%) is controlled by the low-pressure coal slurry pump 16, and the slurry is returned to the mill for secondary grinding through the circulating grinding pipeline 35. The uncirculated coal slurry (main flow rate 77m³ / h) 3 / h) is sent to the secondary drum screen for 20 screenings.

[0072] (4) Under the above grinding conditions, the particles are ground through a mill circulation grinding pipeline until the proportion of coarse particles (150-200μm) is 43% and the proportion of fine particles (15-20μm) is 23%, forming a bimodal distribution. This results in a denser packing structure.

[0073] (5) Steam heating is started simultaneously: low-pressure steam pipeline 6 (0.3MPa, 133℃, flow rate 5 tons / h) injects steam into the mill inlet and adjusts the coal slurry temperature to 70℃ in real time, so that the slurry viscosity is controlled to about 551 mPa·s.

[0074] The screen aperture structure of the primary and secondary drum screens: The drum screen aperture size is 3.0mm × 40mm, the spacing between the apertures is 5mm, and the screening area can be increased by 1.6m². 2 (By extending the length of the sieve openings instead of the width, we can ensure that the flow resistance of the coal slurry is not increased without changing the particle size of the coal slurry).

[0075] Improved swirl plate: The swirl plate height is 100mm, the coal slurry residence time is 15s, and the overflow rate is 0.8%.

[0076] The cyclone separator is used to classify and concentrate coal-water slurry, separating particles of different sizes through centrifugal force to improve the slurry quality.

[0077] The slurry enters the hydrocyclone tangentially, creating a rotating flow field. Fine particles pass through the screen and enter the discharge chute under centrifugal force, while larger particles intercepted by the screen are forced out of the drum screen by the spiral baffles. The hydrocyclone plates are internal guide plates of the drum screen, used to optimize the flow field distribution and enhance separation efficiency. Its advantages include a compact structure, no moving parts, and suitability for rapid classification of high-concentration slurries.

[0078] The material screened by the secondary drum screen enters the coal slurry tank, and the bottom of the coal slurry tank sends the material to the gasifier.

[0079] The flash steam at the top of the coal slurry tank 29 is drawn out by the blower 25 (negative pressure -5kPa) and enters the condensate recovery system through the DN500 pipe 24; the condensate flows into the water seal tank 27 (liquid level 350mm) through the guide pipe 26, reducing the proportion of non-lubricating residual water.

[0080] The above technical solution has the following beneficial effects.

[0081] Utility Model Benefit Calculation Table (Annual Production of 400,000 Tons of Synthetic Ammonia) Table 1

[0082]

[0083] Benefit calculation:

[0084] The price of synthetic ammonia is 2300 yuan / ton.

[0085] Increased production and profit growth: 15%

[0086] Total annual benefits increased to 15.477 million yuan.

[0087] Benefit composition:

[0088] Energy saving benefits: 2 million yuan (1.2 million yuan in coal savings + 800,000 yuan in oxygen savings)

[0089] Increased production benefit: 13.477 million yuan (5,916 tons × 2,300 yuan / ton)

[0090] The proportion of increased production benefits rose to 87.1%.

[0091] Key parameter verification:

[0092] Specific coal consumption: 12 kg / kNm 3 / 2% = 6kg / kNm 3

[0093] Specific oxygen consumption: 16 Nm 3 / kNm 3 / 2% = 8Nm³ / kNm 3

[0094] Increased ammonia production rate: 5916 tons / 400,000 tons = 1.48%

[0095] Calculation basis:

[0096] Coal price: 1000 yuan / ton

[0097] Oxygen price: 0.5 yuan / Nm³ 3

[0098] Annual effective gas demand: 100,000 kNm 3

[0099] When the utility model technology achieves a 2% increase in coal slurry concentration, the annual comprehensive benefit reaches 15.477 million yuan.

[0100] Note:

[0101] The technical solution for increasing the concentration of coal slurry through circulating grinding is as follows: that is, adopt the scheme of Example 1 and Example 4, except that steam is not injected in step (1); the screen hole of the drum screen is a primary drum screen or a secondary drum screen with a screen hole size of 3.0mm×20mm; the height of the swirl plate in the primary drum screen or the secondary drum screen is 70mm; and the steam heating step in step (5) is not performed.

[0102] The technical solution for increasing the temperature and concentration of coal slurry is as follows: the solution of Example 1 and Example 4 is adopted, except that the circulation is not performed in step (1); the screen hole of the drum screen is a primary drum screen or a secondary drum screen with a screen hole size of 3.0mm×20mm; the height of the swirl plate in the primary drum screen or the secondary drum screen is 70mm; the steam heating step in step (5) is not performed.

[0103] The technical solution for increasing the concentration of the drum screen by lengthening the screen holes is as follows: that is, adopt the solution of Example 1 and Example 4, except that circulation is not performed in step (1); steam is not injected in step (1); the height of the cyclone plate in the primary drum screen or the secondary drum screen is 70mm; and the steam heating step in step (5) is not performed.

[0104] The technical solution for increasing the concentration of the cyclone plate is as follows: that is, adopt the solution of Example 1 and Example 4, except that circulation is not performed in step (1); steam is not injected in step (1); the screen hole of the drum screen is a primary drum screen or a secondary drum screen with a screen hole size of 3.0mm×20mm; the steam heating step in step (5) is not performed.

[0105] The technical solution for the data of flash steam discharge condensation and concentration is as follows: that is, the scheme of Example 1 and Example 4 is adopted, except that no circulation is performed in step (1); no steam is injected in step (1); the screen hole of the drum screen is a primary drum screen or a secondary drum screen with a screen hole size of 3.0mm×20mm; the height of the swirl plate in the primary drum screen or the secondary drum screen is 70mm.

[0106] The data in the "total" section comes from the experimental procedures of the complete steps in Examples 1 and 4.

[0107] Using the scheme in this embodiment, the coal slurry concentration was increased to 64.5%, and after one month of operation, the coal slurry concentration stabilized at 64.6%. The conventional process in the background technology is as follows: using the schemes of Embodiments 1 and 4, except that step (1) does not involve circulation or steam injection; the drum screen is a primary or secondary drum screen with a screen size of 3.0mm × 20mm; the height of the swirl plate inside the primary or secondary drum screen is 70mm; and the steam heating step in step (5) is omitted. Using this scheme, the coal slurry concentration was increased to 62.5 ± 0.2%, and after one month of operation, the coal slurry concentration stabilized at 60.8 ± 0.4%.

Claims

1. A coal slurry concentration and comprehensive treatment system based on multi-module collaboration, characterized in that, The raw coal silo (1) is connected to the inlet of the weighing feeder (2), and the bottom outlet of the weighing feeder (2) is connected to the mill (7) via the mill feed pipe (3); the outlet of the mill (7) is connected to the primary drum screen (8), and the bottom outlet of the primary drum screen (8) is connected to the mill discharge trough (13) via the primary drum screen coal slurry guide pipe (9); the bottom outlet of the mill discharge trough (13) is connected to the secondary drum screen (20) via the low-pressure coal slurry pump (16), and the bottom outlet of the secondary drum screen (20) is connected to the coal slurry tank (29) via the secondary drum screen coal slurry guide pipe (22); the bottom outlet of the coal slurry tank (29) is connected to the gasifier via the high-pressure coal slurry pump (32).

2. The coal slurry concentration and comprehensive treatment system based on multi-module collaboration according to claim 1, characterized in that, The mill feed pipe (3) is equipped with a coal mill water pipeline, an additive inlet pipeline, and a low-pressure steam pipeline, and is equipped with a coal mill water valve (4), an additive valve (5), and a low-pressure steam pipeline (6) in sequence.

3. The coal slurry concentration and comprehensive treatment system based on multi-module collaboration according to claim 1, characterized in that, The bottom outlet of the primary drum screen (8) is connected to the inlet of the waste coal slurry pool (11) through a pipe, and the outlet of the waste coal slurry pool (11) is connected to the other inlet of the weighing feeder (2).

4. The coal slurry concentration and comprehensive treatment system based on multi-module collaboration according to claim 1, characterized in that, The bottom outlet of the mill discharge trough (13) is connected to another inlet of the weighing feeder (2) via the low-pressure coal slurry pump (16), the low-pressure coal slurry pump outlet pipeline (18), and the circulating grinding pipeline (35).

5. The coal slurry concentration and comprehensive treatment system based on multi-module collaboration according to claim 1, characterized in that, The top of the coal slurry tank (29) is connected to the flash steam exhaust fan (25) via a flash steam exhaust bend (24).

6. The coal slurry concentration and comprehensive treatment system based on multi-module collaboration according to claim 5, characterized in that, The bottom outlet of the flash steam discharge bend (24) is connected to the inlet of the condensate water seal tank (27) via the condensate guide pipe (26).

7. The coal slurry concentration and comprehensive treatment system based on multi-module collaboration according to claim 5, characterized in that, The overflow port of the condensate guide pipe (26) is connected to the overflow pipe (28) of the condensate water seal tank.

8. The coal slurry concentration and comprehensive treatment system based on multi-module collaboration according to claim 1, characterized in that, The screen aperture size of the primary or secondary drum screen is 3.0mm × 40mm, and the height of the cyclone plate inside the drum screen is 100mm.

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