Coal-based gasification slag residual carbon backflow, circulation and reselection extraction system and process

Abstract

The application discloses a coal-based gasification slag residual carbon backflow, circulating and reselecting extraction system and process, and relates to the technical field of coal chemical industry.The system comprises a circulating water pool, a water bubbling machine, a water selection pool, a particle size sorting machine, a sedimentation classifier, a desliming screen, an A-spiral group, a B-spiral group and a hot air pressure filter.The coal-based gasification slag residual carbon recovery rate reaches more than 98%, which is much higher than the residual carbon recovery rate level of less than 60% in the same industry.The water content of the extracted carbon is less than 40%.The coal-based gasification slag residual carbon backflow, circulating and reselecting extraction system and process can realize the water content of the carbon product after the extraction of the residual carbon in the coal-based gasification slag to be less than 40%, which is much higher than the water content level of 50%-70% of the extracted carbon in the same industry, and effectively solves the technical problem of the dehydration difficulty of the gasification fine slag.

Description

Technical Field

[0001] This invention relates to the field of coal chemical technology, and in particular to a coal-based gasification slag residue reflux, recycling and re-selection extraction system and process. Background Technology

[0002] Sources and Problems of Coal-Based Gasification Slag: Coal-based gasification slag is a solid residue generated during the coal gasification process, consisting of both coarse and fine gasification slag. It is considered solid waste from coal chemical industry enterprises. It contains unreacted carbon, ash, and other oxides. In existing coal gasification technologies, the residual carbon content in coal-based gasification slag is relatively high, ranging from 10% to 30%.

[0003] The resource utilization of coal-based gasification slag focuses on the recovery and reuse of residual carbon and inorganic minerals in the ash. However, the close binding of residual carbon and ash in coal-based gasification slag makes direct utilization difficult. The mixing of residual carbon and ash, coupled with the high technical difficulty in separation, has become a bottleneck restricting the resource utilization of coal-based gasification slag. Therefore, the separation of residual carbon and ash is the primary technical step for the resource utilization, high-value utilization, comprehensive utilization, and large-scale application of coal-based gasification slag.

[0004] Currently, large-scale treatment of coal-based gasification slag in my country primarily relies on landfill disposal, leading to resource waste, land occupation, and environmental pollution. Meanwhile, the comprehensive recycling and reuse of coal-based gasification slag is gradually becoming a key factor restricting the development of the coal chemical industry. Therefore, there is an urgent need for a high-value, high-efficiency, comprehensive, and large-scale application technology for the treatment of coal-based gasification slag.

[0005] Existing technical defects: First, the current bottleneck in the separation technology of coal-based gasification slag residue and ash directly leads to low recovery rate of coal-based gasification slag residue and low purity of extracted carbon. Specific technical defects: The recovery rate of coal-based gasification slag residue refers to the mass ratio of the residue product extracted from coal-based gasification slag after processing by a certain coal-based gasification slag residue extraction system and process to the residue before extraction.

[0006] The residual carbon recovery rate not only affects the utilization rate of coal-based gasification slag residual carbon resources, but is also a key standard for directly evaluating the merits of this type of "gasification slag residual carbon extraction technology".

[0007] A higher residual carbon recovery rate indicates a stronger and higher quality ability of the technology to recover and recycle residual carbon resources from coal-based gasification slag. A high residual carbon recovery rate is a crucial technological capability for ensuring the full recovery and recycling of residual carbon resources in solid wastes such as coal-based gasification slag. It is also a fundamental technological support for realizing the resource-based and high-value utilization of bulk industrial solid waste.

[0008] The current traditional gasification slag carbon extraction process in China is limited by the defects of existing technology, especially in the pretreatment stage of gasification slag raw materials. Due to the large amount of loss and waste of residual carbon in the gasification slag raw materials, the residual carbon recovery rate is low, less than 60%, resulting in resource loss in the comprehensive utilization of gasification slag.

[0009] The carbon purity after extraction is not high: The carbon purity after extraction of coal-based gasification slag residue refers to the proportion of carbon and non-carbon substances in the residue product extracted from coal-based gasification slag after processing by a certain gasification slag carbon extraction system and process.

[0010] The purity of the extracted carbon not only affects the quality of the extracted carbon, but is also the core standard for evaluating the merits of this type of "gasification residue carbon extraction technology".

[0011] The higher the purity of the extracted carbon, the more fully the technology can be applied to the separation of residual carbon and ash from coal-based gasification slag, and the more sophisticated the separation technology is. This provides better technical support for the high-quality and high-value utilization of solid waste resources such as gasification slag, and promotes the high-standard and high-level development of the solid waste comprehensive utilization industry while achieving high-quality and high-value utilization of bulk industrial solid waste.

[0012] The current traditional gasification slag carbon extraction process in China is limited by the defects of existing technology, especially in the unidirectional multi-stage separation process, it is difficult to fully separate residual carbon and non-carbon substances. This results in a large loss of residual carbon and a reduction in the purity of the extracted carbon, which is below 85%, and the quality of the extracted carbon is poor.

[0013] Secondly, coal-based gasification fine slag is a filter cake formed from the concentration, sedimentation, and filter pressing of gasification black water, and it has a high moisture content. Due to the strong water-holding capacity of the gasification fine slag particles and the strong binding force between the hydrophilic functional groups on the particle surface and polar water, the dehydration efficiency is severely affected, making the dehydration of gasification fine slag a current technical challenge in the industry. This results in high moisture content and difficulty in dehydration of the carbon products extracted from coal-based gasification fine slag, leading to specific technical defects that affect reuse.

[0014] The high moisture content of the extracted carbon makes dehydration difficult, affecting its reusability.

[0015] Due to the characteristics of coal-based gasification slag, such as well-developed pores, large specific surface area, severe surface oxidation, poor hydrophobicity, high water content (50%-70%), and low calorific value, the residual carbon in the coal-based gasification slag is difficult to dehydrate and cannot be directly co-fired. After extraction, the residual carbon product still has an extremely high moisture content (50%-70%) after dehydration by conventional methods, which seriously affects the secondary use of extracted carbon and the market value of comprehensive utilization products of coal-based gasification slag.

[0016] Therefore, addressing the high moisture content of coal-based gasification slag residue and improving the dehydration capacity of extracted carbon are market demands for achieving high-quality, high-value recycling and reuse of coal-based gasification slag residue products. It is also necessary to strengthen the market competitiveness of enterprises in the comprehensive utilization industry of coal-based gasification slag.

[0017] Finally, coal-based gasification slag includes both coarse and fine gasification slag. Comprehensive treatment technology for both coarse and fine gasification slag is crucial for achieving large-scale coal-based gasification slag processing capabilities. Based on the requirements for large-scale coal-based gasification slag processing, and considering current traditional processes, specific technical shortcomings exist: limited processing capacity, weak comprehensive processing capability, and low overall energy efficiency. Specifically, due to differences in physical morphology, formation process, and chemical composition between coarse and fine gasification slag, current traditional processes can only process either coarse or fine gasification slag individually, failing to achieve "multi-functionality," thus hindering the large-scale processing of coal-based gasification slag.

[0018] A comprehensive treatment process and system capable of processing gasification coarse slag or gasification fine slag separately, as well as a mixture of gasification coarse slag and gasification fine slag, not only greatly saves input costs, but is also a necessary requirement for realizing the large-scale utilization of coal-based gasification slag, while improving the overall efficiency of the coal-based gasification slag treatment industry.

[0019] Due to the limitations of current traditional gasification slag carbon extraction processes, such as low residual carbon recovery rate, low carbon purity after extraction, high moisture content in the extracted carbon product, limited processing targets, relatively high energy consumption, and high equipment costs, it is essential to develop a coal-based gasification slag residual carbon extraction system and process that features high residual carbon recovery rate, high carbon purity after extraction, relatively low moisture content in the extracted carbon product, comprehensive gasification slag processing capabilities, relatively low energy consumption, and relatively low investment costs. Summary of the Invention

[0020] The purpose of this invention is to solve the above-mentioned problems by designing a coal-based gasification slag residue reflux, recycling, and re-selection extraction system and process. This invention addresses the issues of low residue recovery rate, low carbon purity after extraction, high moisture content in extracted carbon products, limited processing targets, relatively high energy consumption, and high equipment costs in existing coal-based gasification slag residue extraction technologies. These technologies fail to achieve high-quality, high-value-added, and large-scale recovery and full recycling of coal-based gasification slag residue, minimize residue resource waste, and provide comprehensive processing capabilities for mixed gasification slag raw materials.

[0021] The technical solution of the present invention to achieve the above objectives is as follows: a coal-based gasification slag residue reflux and recycling extraction system, including a circulating water tank, a water bubbler, a water separation tank, a particle size separator, a sedimentation classifier, a desliming screen, an A spiral group, a B spiral group, and a hot air filter press.

[0022] The circulating water tank is used to supply water to the water jetting machine, which is used to inject water into the water separation tank for impact. The outlet of the water separation tank is connected to the inlet of the particle size separator. The undersize outlet of the particle size separator is connected to the inlet of the sedimentation classifier. The flotation slurry outlet of the sedimentation classifier is connected to the inlet of the desliming screen. The oversize outlet of the desliming screen is connected to the inlet of the A spiral assembly. The A concentrate slurry outlet of the A spiral assembly is connected to the inlet of the B spiral assembly. The concentrate slurry outlet of the B spiral assembly is connected to the inlet of the hot air filter press.

[0023] Preferably, it includes a first material tank, a first slurry pump, a second material tank, a second slurry pump, a concentrate slurry tank, a filter press pump, and a finished carbon storage tank;

[0024] The inlet of the first material tank is connected to the discharge outlet of the desliming screen. The outlet of the first material tank is connected to the inlet of the first slurry pump. The outlet of the first slurry pump is connected to the inlet of the A spiral assembly. The inlet of the second material tank is connected to the A concentrate slurry outlet of the A spiral assembly. The outlet of the second material tank is connected to the inlet of the second slurry pump. The outlet of the second slurry pump is connected to the inlet of the B spiral assembly. The inlet of the concentrate slurry tank is connected to the concentrate slurry outlet of the B spiral assembly. The outlet of the concentrate slurry tank is connected to the inlet of the filter press pump. The outlet of the filter press pump is connected to the inlet of the hot air filter press. After the concentrate slurry is pumped into the hot air filter press for dewatering, it forms finished carbon. The finished carbon is transported to the finished carbon silo.

[0025] Preferably, it includes a residue silo, a coarse ash silo, an A dewatering screen, an A fine ash silo, a B dewatering screen, a B fine ash silo, a tailings filter press pump, a tailings filter press, and a tailings silo.

[0026] The feed inlet of the residue silo is connected to the screen outlet of the particle size separator; the feed inlet of the coarse ash silo is connected to the coarse ash outlet of the settling classifier; the feed inlet of the A dewatering screen is connected to the A tailings outlet of the A spiral assembly; the screen outlet of the A dewatering screen is connected to the feed inlet of the A fine ash silo; the feed inlet of the B dewatering screen is connected to the B tailings outlet of the B spiral assembly; the screen outlet of the B dewatering screen is connected to the feed inlet of the B fine ash silo; the feed inlet of the tailings filter press pump is connected to the outlet of the sedimentation tank; the outlet of the tailings filter press pump is connected to the feed inlet of the tailings filter press; and the tailings outlet of the tailings filter press is connected to the feed inlet of the tailings silo.

[0027] Preferably, the sludge underflow from the desliming screen, the water underflow from the A dewatering screen, the water underflow from the B dewatering screen, and the filter water from the hot air filter press all enter the sedimentation tank through a gravity-flow trough.

[0028] The filter water from the tailings filter press enters the circulating water tank through a gravity-flow trough.

[0029] Preferably, gravity-flow troughs are installed between the water separation tank and the particle size separator, between the particle size separator and the sedimentation classifier, between the sedimentation classifier and the desliming screen, between the desliming screen and the first material tank, between the desliming screen and the sedimentation tank, between the A spiral group and the second material tank, between the A spiral group and the A dewatering screen, between the B spiral group and the concentrate slurry tank, and between the B spiral group and the B dewatering screen.

[0030] Conveyor belts are installed between the particle size separator and the residue silo, between the settling classifier and the coarse ash silo, between the A dewatering screen and the A fine ash silo, between the B dewatering screen and the B fine ash silo, between the hot air filter press and the finished carbon silo, and between the tailings filter press and the tailings silo.

[0031] Preferably, the particle size separator is a single unit or multiple units connected in series, and the separator adopts a linear vibrating screen; the sedimentation classifier is a single unit or multiple units connected in series, and the classifier adopts a single shaft; the A spiral group and B spiral group are both multiple units connected in series, and spiral chutes are used; the hot air filter press is a single unit or multiple units connected in series, and an automated hot air backflushing filter press is used; and the tailings filter press is a single unit or multiple units connected in series, and a high-pressure diaphragm filter press is used.

[0032] A coal-based gasification slag residue reflux and recycling extraction process includes the following steps:

[0033] Step 1: Continuously inject water to impact the gasification slag solids, making them dispersed and easy to flow;

[0034] Step 2: Perform particle size separation on the gasification slag to obtain slurry and residue;

[0035] Step 3: Sedimentation and classification of the slurry to obtain flotation slurry and coarse ash;

[0036] Step 4: Deslim the flotation slurry to obtain slurry with a mesh size greater than or equal to 200 mesh and mud with a mesh size less than 200 mesh;

[0037] Step 5: Perform a first spiral treatment on the slurry with a mesh size of 200 or larger to obtain A concentrate slurry, A middlings slurry, and A tailings;

[0038] Step 6: Perform a second spiral processing on the A concentrate slurry to obtain concentrate slurry, B middlings slurry, and B tailings;

[0039] Step 7: The concentrate slurry is dehydrated by hot air pressure filtration to form finished carbon.

[0040] Preferably, the slurry in step 5, A, is returned to the first material pool and then the spiral separation process in step 5 is repeated.

[0041] The slurry in step B of step 6 is returned to the second material tank and then the spiral treatment in step 6 is repeated.

[0042] Preferably, the water supply rate is 400 cubic meters per hour during the continuous water injection impact of the gasification slag.

[0043] The gasification slag is fed by gravity into one or more particle size separators for vibration separation;

[0044] The slurry is fed by gravity into one or more settling and classifying machines for settling and classification.

[0045] The floating slurry is deslimed and extracted by gravity flow into one or more desliming screens.

[0046] The slurry with a mesh size of 200 or higher is fed into multiple A-type spiral pumps by one or more first slurry pumps for classification.

[0047] The A concentrate slurry is fed into multiple B spiral groups for classification via one or more second slurry pumps.

[0048] The concentrate slurry is pumped into one or more hot air filter presses by one or more filter press pumps for drying, dehydration and extraction.

[0049] The tailings are pumped into one or more tailings filter presses for dewatering and extraction.

[0050] Tailings A and tailings B are fed by gravity into one or more A dewatering screens and B dewatering screens respectively to extract fine ash A and fine ash B.

[0051] The particle size separator has a vibration frequency of 960 rpm at a fixed frequency, a screen aperture of 3 mm, and two 6-pole motors.

[0052] The desliming screen has a fixed vibration frequency of 960 rpm, a screen cloth aperture of 200 mesh, and two 6-pole motors.

[0053] The first slurry pump has a working flow rate of 400 cubic meters per hour, a frequency of 1440 revolutions per minute, a power of 45 kilowatts, and a 4-pole single motor.

[0054] The second slurry pump has a working flow rate of 260 cubic meters per hour, a frequency of 960 revolutions per minute, a power of 22 kilowatts, and a 6-pole single motor.

[0055] The filter press pump has a frequency of 960 revolutions per minute, a power of 75 kilowatts, and a 6-pole single motor.

[0056] Both the A dewatering screen and the B dewatering screen use a frequency of 960 rpm, a 120-mesh screen cloth, and two 6-pole motors.

[0057] The present invention provides a coal-based gasification slag residual carbon reflux, recycling and re-selection extraction system and process, which achieves a coal-based gasification slag residual carbon recovery rate of over 98%. The coal-based gasification slag residual carbon reflux, recycling and re-selection extraction system and process provided by the present invention can achieve a residual carbon recovery rate of over 98% for coal-based gasification slag, which is far higher than the industry average of less than 60%.

[0058] To further explain, the coal-based gasification slag residual carbon reflux, recycling and re-selection extraction system and process provided by the present invention achieves a coal-based gasification slag residual carbon recovery rate of over 98%, which is applicable not only to coarse gasification slag in coal-based gasification slag, but also to fine gasification slag in coal-based gasification slag, and also to mixed slag of coarse gasification slag and fine gasification slag in coal-based gasification slag.

[0059] The carbon purity of coal-based gasification slag residue after extraction reaches 90%: The coal-based gasification slag residue reflux and recycling extraction system and process provided by this invention can achieve a carbon purity of 90% (of which the ash content is 10%) after extraction of coal-based gasification slag residue, which is far higher than the carbon purity level of less than 85% in the same industry.

[0060] To further explain, the coal-based gasification slag residual carbon reflux, recycling and re-selection extraction system and process provided by the present invention achieves a carbon purity of 90% after extraction of coal-based gasification slag residual carbon, which is applicable not only to coarse gasification slag in coal-based gasification slag, but also to fine gasification slag in coal-based gasification slag, and also to mixed slag of coarse gasification slag and fine gasification slag in coal-based gasification slag.

[0061] The moisture content of extracted carbon is <40%: The coal-based gasification slag residual carbon reflux and recycling re-selection extraction system and process provided by this invention can achieve a moisture content of <40% in the carbon product (hereinafter referred to as: extracted carbon) after extraction of residual carbon from coal-based gasification slag, which is far higher than the industry level of 50%-70% moisture content in extracted carbon, and effectively solves the industry technical problem of difficult dehydration of gasification fine slag.

[0062] To further explain, the coal-based gasification slag residual carbon reflux, recycling and re-selection extraction system and process provided by the present invention, which achieves a moisture content of <40% for extracted carbon, is applicable not only to coarse gasification slag in coal-based gasification slag, but also to fine gasification slag in coal-based gasification slag, and also to mixed slag of coarse and fine gasification slag in coal-based gasification slag.

[0063] The "one machine, multiple uses" comprehensive treatment function of coal-based gasification slag: The coal-based gasification slag residual carbon reflux, recycling and re-selection extraction system and process provided by this invention can simultaneously process coal-based gasification coarse slag or coal-based gasification fine slag, and also process mixed slag of coal-based gasification coarse slag and coal-based gasification fine slag.

[0064] Compared to other processes in the industry that can only process either coarse or fine coal-based gasification slag, this invention provides a coal-based gasification slag residual carbon reflux, recycling, and re-extraction system and process that has a comprehensive processing function that far surpasses that of other processes in the industry, offering "multi-purpose functionality in one machine". Attached Figure Description

[0065] Figure 1 This is a schematic diagram of the coal-based gasification slag residue reflux and recycling re-selection extraction system of the present invention;

[0066] In the diagram: 1. Water separation tank; 2. Water immersion machine; 3. Particle size separator; 4. Slurry; 5. Residue silo; 6. Sedimentation classifier; 7. Flotation slurry; 8. Coarse ash silo; 9. Desliming screen; 10. 200-mesh slurry; 11. First feed tank; 12. First slurry pump; 13. A spiral assembly; 14. A middlings slurry; 15. A concentrate slurry; 16. A tailings; 17. A dewatering screen; 18. A fine... 19. Ash silo, 20. Second material tank, 21. Second slurry pump, 22. B spiral assembly, 23. B middlings slurry, 24. Concentrate slurry tank, 25. B tailings, 26. B dewatering screen, 27. B fine ash silo, 28. Filter press pump, 29. Hot air filter press, 30. Finished carbon silo, 31. Sedimentation tank, 32. Tailings filter press pump, 33. Tailings filter press, 34. Tailings silo, 35. Circulating water tank. Detailed Implementation

[0067] The present invention will now be described in detail with reference to the accompanying drawings, such as... Figure 1 As shown, a coal-based gasification slag residue reflux, recycling and re-selection extraction system and process are described.

[0068] Example: A coal-based gasification slag residue reflux and recycling extraction system includes a circulating water tank 34, a water bubbler 2, a water separation tank 1, a particle size separator 3, a sedimentation classifier 6, a desliming screen 9, an A spiral group 13, a B spiral group 21, and a hot air filter press 28.

[0069] The circulating water tank 34 is used to supply water to the water bubbler 2, which is used to inject water into the water separation tank 1 for impact. The outlet of the water separation tank 1 is connected to the inlet of the particle size separator 3. The undersize outlet of the particle size separator 3 is connected to the inlet of the sedimentation classifier 6. The flotation slurry outlet of the sedimentation classifier 6 is connected to the inlet of the desliming screen 9. The oversize outlet of the desliming screen 9 is connected to the inlet of the A spiral group 13. The A concentrate slurry outlet of the A spiral group 13 is connected to the inlet of the B spiral group 21. The concentrate slurry outlet of the B spiral group 21 is connected to the inlet of the hot air filter press 28.

[0070] It includes a first material tank 11, a first slurry pump 12, a second material tank 19, a second slurry pump 20, a concentrate slurry tank 23, a filter press pump 27, and a finished carbon storage tank 29;

[0071] The inlet of the first material tank 11 is connected to the discharge outlet of the desliming screen 9. The discharge outlet of the first material tank 11 is connected to the inlet of the first slurry pump 12. The discharge outlet of the first slurry pump 12 is connected to the inlet of the A spiral assembly 13. The inlet of the second material tank 19 is connected to the A concentrate slurry discharge outlet of the A spiral assembly 13. The discharge outlet of the second material tank 19 is connected to the inlet of the second slurry pump 19. The discharge outlet of the second slurry pump 19 is connected to the inlet of the B spiral assembly 21. The inlet of the concentrate slurry tank 23 is connected to the concentrate slurry discharge outlet of the B spiral assembly 21. The discharge outlet of the concentrate slurry tank 23 is connected to the inlet of the filter press pump 27. The discharge outlet of the filter press pump 27 is connected to the inlet of the hot air filter press 28. After the concentrate slurry is pumped into the hot air filter press 28 by the filter press pump 27 for dewatering, it forms finished carbon. The finished carbon is transported to the finished carbon storage 29.

[0072] It includes a residue silo 5, a coarse ash silo 8, an A dewatering screen 17, an A fine ash silo 18, a B dewatering screen 25, a B fine ash silo 26, a tailings filter press pump 31, a tailings filter press 32, and a tailings silo 33.

[0073] The feed inlet of residue silo 5 is connected to the screen outlet of particle size separator 3; the feed inlet of coarse ash silo 8 is connected to the coarse ash outlet of settling classifier 6; the feed inlet of A dewatering screen 17 is connected to the A tailings outlet of A spiral assembly 13; the screen outlet of A dewatering screen 17 is connected to the feed inlet of A fine ash silo 18; the feed inlet of B dewatering screen 25 is connected to the B tailings outlet of B spiral assembly 21; the screen outlet of B dewatering screen 25 is connected to the feed inlet of B fine ash silo 26; the feed inlet of tailings filter press pump 31 is connected to the outlet of sedimentation tank 30; the outlet of tailings filter press pump 31 is connected to the feed inlet of tailings filter press 32; and the tailings outlet of tailings filter press 32 is connected to the feed inlet of tailings silo 33.

[0074] The sludge under the screen of the sludge desliming screen 9, the water under the screen of the A dewatering screen 17, the water under the screen of the B dewatering screen 25, and the filter water from the hot air filter press 28 all enter the sedimentation tank 30 through a gravity flow trough.

[0075] The filter water from the tailings filter press 32 enters the circulating water tank 34 through a gravity-flow trough.

[0076] Self-flowing water troughs are installed between water separation tank 1 and particle size separator 3, between particle size separator 3 and sedimentation classifier 6, between sedimentation classifier 6 and desliming screen 9, between desliming screen 9 and first material tank 11, between desliming screen 9 and sedimentation tank 30, between A spiral group 13 and second material tank 19, between A spiral group 13 and A dewatering screen 17, between B spiral group 21 and concentrate slurry tank 23, and between B spiral group 21 and B dewatering screen 25.

[0077] Conveyor belts are installed between particle size separator 3 and residue silo 5, between sedimentation classifier 6 and coarse ash silo 8, between A dewatering screen 17 and A fine ash silo 18, between B dewatering screen 25 and B fine ash silo 26, between hot air filter press 28 and finished carbon silo 29, and between tailings filter press 32 and tailings silo 33.

[0078] The particle size separator 3 is a single unit or multiple units connected in series. The separator adopts a linear vibrating screen. The sedimentation classifier 6 is a single unit or multiple units connected in series. The classifier adopts a single shaft. The A spiral group 13 and the B spiral group 21 are both multiple units connected in series and adopt spiral chutes. The hot air filter press 28 is a single unit or multiple units connected in series and adopts an automated hot air backflushing filter press. The tailings filter press 32 is a single unit or multiple units connected in series and adopts a high-pressure diaphragm filter press.

[0079] A coal-based gasification slag residue reflux and recycling extraction process includes the following steps:

[0080] Step 1: Continuously inject water to impact the gasification slag solids, making them dispersed and easy to flow;

[0081] Step 2: Perform particle size separation on the gasification slag to obtain slurry and residue;

[0082] Step 3: Sedimentation and classification of the slurry to obtain flotation slurry and coarse ash;

[0083] Step 4: Deslim the flotation slurry to obtain slurry with a mesh size greater than or equal to 200 mesh and mud with a mesh size less than 200 mesh;

[0084] Step 5: Perform a first spiral treatment on the slurry with a mesh size of 200 or larger to obtain A concentrate slurry, A middlings slurry, and A tailings;

[0085] Step 6: Perform a second spiral processing on the A concentrate slurry to obtain concentrate slurry, B middlings slurry, and B tailings;

[0086] Step 7: The concentrate slurry is dehydrated by hot air pressure filtration to form finished carbon.

[0087] The slurry in step 5, A, is returned to the first material pool and then the spiral separation process in step 5 is repeated.

[0088] The slurry in step B of step 6 is returned to the second material tank and then the spiral treatment in step 6 is repeated.

[0089] When continuously injecting water to impact the gasification slag, the water distribution rate is 400 cubic meters per hour (per 100 tons of gasification slag);

[0090] The gasification slag flows by gravity into one or more particle size separators 3 for vibration separation;

[0091] The slurry flows by gravity into one or more settling classifiers 6 for settling and classification;

[0092] The flotation slurry is fed by gravity into one or more desliming screens 9 for desliming and extraction.

[0093] Slurry with a mesh size of 200 or higher is fed into multiple A spiral pump groups 13 for classification via one or more first slurry pumps 12;

[0094] A concentrate slurry is fed into multiple B spiral groups 21 by one or more second slurry pumps 20 for classification;

[0095] The concentrate slurry is fed into one or more hot air filter presses 28 via one or more filter press pumps 27 for drying, dehydration and extraction.

[0096] Tailings are pumped into one or more tailings filter presses 32 via one or more tailings filter press pumps 31 for dewatering and extraction;

[0097] Tailings A and tailings B are fed by gravity into one or more A dewatering screens 17 and B dewatering screens 25 respectively for dewatering and extraction of A fine ash and B fine ash.

[0098] The particle size separator 3 has a fixed vibration frequency of 960 rpm, a screen aperture of 3 mm, and two 6-pole motors.

[0099] The sludge desliming screen 9 has a fixed vibration frequency of 960 rpm, a screen cloth aperture of 200 mesh (0.074 mm), and two 6-pole motors.

[0100] The first slurry pump 12 has a working flow rate of 400 cubic meters per hour, a frequency of 1440 revolutions per minute, a power of 45 kilowatts, and a 4-pole single motor.

[0101] The second slurry pump 20 has a working flow rate of 260 cubic meters per hour, a frequency of 960 revolutions per minute, a power of 22 kilowatts, and a 6-pole single motor.

[0102] The filter press pump 27 has a frequency of 960 rpm, a power of 75 kW, and a 6-pole single motor.

[0103] Both the A dewatering screen 17 and the B dewatering screen 25 use a frequency of 960 rpm, a screen cloth with an aperture of 120 mesh (approximately 0.125 mm), and two 6-pole motors.

[0104] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

Claims

1. A coal-based gasification slag residue reflux and recycling extraction system, characterized in that, It includes a circulating water tank (34), a water bubble machine (2), a water separation tank (1), a particle size separator (3), a sedimentation classifier (6), a desliming screen (9), an A spiral assembly (13), a B spiral assembly (21), and a hot air filter press (28). The circulating water tank (34) is used to supply water to the bubble machine (2), the bubble machine (2) is used to inject water into the water separation tank (1) for impact, the outlet of the water separation tank (1) is connected to the inlet of the particle size separator (3), the undersize outlet of the particle size separator (3) is connected to the inlet of the sedimentation classifier (6), the flotation slurry outlet of the sedimentation classifier (6) is connected to the inlet of the desliming screen (9), the oversize outlet of the desliming screen (9) is connected to the inlet of the A spiral group (13), the A concentrate slurry outlet of the A spiral group (13) is connected to the inlet of the B spiral group (21), and the concentrate slurry outlet of the B spiral group (21) is connected to the inlet of the hot air filter press (28). It also includes a first material tank (11), a first slurry pump (12), a second material tank (19), a second slurry pump (20), a concentrate slurry tank (23), a filter press pump (27), and a finished carbon storage tank (29). The inlet of the first material tank (11) is connected to the discharge outlet of the desliming screen (9), the outlet of the first material tank (11) is connected to the inlet of the first slurry pump (12), the outlet of the first slurry pump (12) is connected to the inlet of the A spiral assembly (13), the inlet of the second material tank (19) is connected to the A concentrate slurry outlet of the A spiral assembly (13), the outlet of the second material tank (19) is connected to the inlet of the second slurry pump (20), and the second slurry pump ( The outlet of the 20) is connected to the inlet of the B spiral group (21), the inlet of the concentrate slurry tank (23) is connected to the outlet of the concentrate slurry of the B spiral group (21), the outlet of the concentrate slurry tank (23) is connected to the inlet of the filter press pump (27), and the outlet of the filter press pump (27) is connected to the inlet of the hot air filter press (28). After the concentrate slurry is pumped into the hot air filter press (28) by the filter press pump (27) for dewatering, it forms finished carbon. The finished carbon is transported to the finished carbon warehouse (29). It also includes a residue silo (5), a coarse ash silo (8), an A dewatering screen (17), an A fine ash silo (18), a B dewatering screen (25), a B fine ash silo (26), a tailings filter press pump (31), a tailings filter press (32), and a tailings silo (33). The feed inlet of the residue silo (5) is connected to the screen outlet of the particle size separator (3); the feed inlet of the coarse ash silo (8) is connected to the coarse ash outlet of the settling classifier (6); the feed inlet of the A dewatering screen (17) is connected to the A tailings outlet of the A spiral assembly (13); the screen outlet of the A dewatering screen (17) is connected to the feed inlet of the A fine ash silo (18); and the feed inlet of the B dewatering screen (25) is connected to the B spiral assembly. The tailings outlet of group (21) is connected to the B tailings outlet, the screen outlet of the B dewatering screen (25) is connected to the inlet of the B fine ash silo (26), the inlet of the tailings filter press pump (31) is connected to the outlet of the sedimentation tank (30), the outlet of the tailings filter press pump (31) is connected to the inlet of the tailings filter press (32), and the tailings outlet of the tailings filter press (32) is connected to the inlet of the tailings silo (33). The sludge under the screen of the desludge screen (9), the water under the screen of the A dewatering screen (17), the water under the screen of the B dewatering screen (25), and the filter water from the hot air filter press (28) all enter the sedimentation tank (30) through a gravity flow tank. The filter water from the tailings filter press (32) enters the circulating water tank (34) through a gravity-flow trough.

2. The coal-based gasification slag residue reflux and recycling extraction system according to claim 1, characterized in that, Self-flowing water troughs are installed between the water separation tank (1) and the particle size separator (3), between the particle size separator (3) and the sedimentation classifier (6), between the sedimentation classifier (6) and the desliming screen (9), between the desliming screen (9) and the first material tank (11), between the desliming screen (9) and the sedimentation tank (30), between the A spiral group (13) and the second material tank (19), between the A spiral group (13) and the A dewatering screen (17), between the B spiral group (21) and the concentrate slurry tank (23), and between the B spiral group (21) and the B dewatering screen (25). Conveyor belts are installed between the particle size separator (3) and the residue silo (5), between the settling classifier (6) and the coarse ash silo (8), between the A dewatering screen (17) and the A fine ash silo (18), between the B dewatering screen (25) and the B fine ash silo (26), between the hot air filter press (28) and the finished carbon silo (29), and between the tailings filter press (32) and the tailings silo (33).

3. The coal-based gasification slag residue reflux and recycling extraction system according to claim 2, characterized in that, The particle size separator (3) is a single unit or multiple units connected in series. The separator adopts a linear vibrating screen. The sedimentation classifier (6) is a single unit or multiple units connected in series. The classifier adopts a single shaft. The A spiral group (13) and B spiral group (21) are multiple units connected in series and adopt spiral chutes. The hot air filter press (28) is a single unit or multiple units connected in series and adopts an automated hot air backflushing filter press. The tailings filter press (32) is a single unit or multiple units connected in series and adopts a high-pressure diaphragm filter press.

4. A coal-based gasification slag residue reflux and recycling extraction process, employing the coal-based gasification slag residue reflux and recycling extraction system described in any one of claims 1-3, characterized in that, Includes the following steps: Step 1: Continuously inject water to impact the gasification slag solids, making them dispersed and easy to flow; Step 2: Perform particle size separation on the gasification slag to obtain slurry and residue; Step 3: Sedimentation and classification of the slurry to obtain flotation slurry and coarse ash; Step 4: Deslim the flotation slurry to obtain slurry with a mesh size greater than or equal to 200 mesh and mud with a mesh size less than 200 mesh; Step 5: Perform a first spiral treatment on the slurry with a mesh size of 200 or larger to obtain A concentrate slurry, A middlings slurry, and A tailings; Step 6: Perform a second spiral processing on the A concentrate slurry to obtain concentrate slurry, B middlings slurry, and B tailings; Step 7: The concentrate slurry is dehydrated by hot air pressure filtration to form finished carbon.

5. The coal-based gasification slag residue reflux and recycling extraction process according to claim 4, characterized in that, The slurry in step 5, A, is returned to the first material pool and then the spiral separation process in step 5 is repeated. The slurry in step B of step 6 is returned to the second material tank and then the spiral treatment in step 6 is repeated.

6. The coal-based gasification slag residue reflux and recycling extraction process according to claim 5, characterized in that, During the continuous water injection impact of the gasification slag, the water supply rate is 400 cubic meters per hour; The gasification slag is fed by gravity into one or more particle size separators (3) for vibration separation; The slurry is fed by gravity into one or more settling classifiers (6) for settling and classification; The floating slurry is deslimed and extracted by gravity flow into one or more desliming screens (9); The slurry with a mesh size of 200 or higher is fed into multiple A spiral pump groups (13) by one or more first slurry pumps (12) for classification; The A concentrate slurry is fed into multiple B spiral groups (21) by one or more second slurry pumps (20) for classification; The concentrate slurry is fed into one or more hot air filter presses (28) via one or more filter press pumps (27) for drying, dehydration and extraction; Tailings are pumped (31) into one or more tailings filter presses (32) for dewatering and extraction; The tailings A and B are fed by gravity into one or more A dewatering screens (17) and B dewatering screens (25) respectively for dewatering to extract A fine ash and B fine ash; The particle size separator (3) has a vibration frequency of 960 rpm, a screen aperture of 3 mm, and two 6-pole motors. The vibration frequency of the desliming screen (9) is a fixed frequency of 960 rpm, the screen cloth aperture is 200 mesh, and there are two 6-pole motors. The first slurry pump (12) has a working flow rate of 400 cubic meters per hour, a frequency of 1440 revolutions per minute, a power of 45 kilowatts, and a 4-pole single motor. The second slurry pump (20) has a working flow rate of 260 cubic meters per hour, a frequency of 960 revolutions per minute, a power of 22 kilowatts, and a 6-pole single motor. The filter press pump (27) has a frequency of 960 rpm, a power of 75 kW, and a 6-pole single motor. The A dewatering screen (17) and B dewatering screen (25) both use a frequency of 960 rpm, a 120-mesh sieve cloth, and two 6-pole motors.

Images