An industrial gasification slag grading recycling device and method

Abstract

The application discloses an industrial gasification slag grading recycling equipment and method, relates to the solid waste resource utilization technical field, and the equipment comprises a sorting treatment mechanism, a heat utilization mechanism and a water circulation mechanism, the sorting treatment mechanism is used for separating and sorting the gasification slag, and comprises a hot blast furnace, a cyclone separator, a sorting machine and a finished product bin; the heat utilization mechanism is used for fully utilizing system heat, and comprises a heating floor heating, a condenser, a condensate tank and a delivery pump; the water circulation mechanism is used for recycling system water, and comprises a circulating water tank and a circulating pump. The industrial gasification slag grading recycling equipment and method adopts dry method carbon ash separation, the heat value of the finished gasification slag is greatly improved while removing water in the grading recycling process, the comprehensive utilization of the gasification slag can be realized, the heat in the whole system is recycled and fully utilized, and the system heat energy utilization rate is improved.

Description

Technical Field

[0001] This invention relates to the field of solid waste resource utilization technology, and in particular to a device and method for graded recycling of industrial gasification slag. Background Technology

[0002] China is a major coal producer and consumer in the world. Coal gasification technology is hailed as the leading technology in the modern coal chemical industry, providing syngas for the entire downstream chemical production process. However, the gasification process inevitably generates a large amount of coal gasification slag. Statistics show that my country's annual coal gasification slag emissions exceed 33 million tons, causing significant pollution to the ecological environment. Currently, coal gasification slag production is high, utilization rate is low, treatment costs are high, and it poses environmental threats. Stockpiling and landfilling remain the main disposal methods for coal gasification slag. This method not only occupies a large amount of land but also causes soil and water pollution, rendering much land uncultivable and wasting land resources. When used as a co-firing agent in boilers, coal gasification slag has high moisture content, low residual carbon, and insufficient calorific value. When used as a cement substitute, the high residual carbon content limits the blending ratio. The interaction between carbon and ash hinders its resource utilization. Therefore, under the premise of harmless treatment, further adopting environmentally friendly and economical resource-based methods to treat coal gasification slag is not only an urgent need to improve the efficiency of coal resource development and utilization, but also an inherent requirement for building an environmentally friendly and resource-saving society.

[0003] In the coal gasification process, raw coal undergoes rapid decomposition at high temperatures within the gasifier. The gasification slag discharged from the bottom of the gasifier is typically called coarse slag, accounting for approximately 60-80%, while the slag carried out from the top by the gas flow is called fine slag, accounting for approximately 20-40%. After high-temperature gasification, the coarse slag has a low residual carbon content, while the fine slag has a high carbon content. Separating the residual carbon and ash components from the gasification fine slag is crucial for achieving its high-value, reduced-volume, and harmless utilization. Currently, the main decarbonization technology for coal gasification slag is still flotation, but this method has drawbacks such as high reagent consumption, high reagent costs, low residual carbon recovery rate, secondary pollution, and difficulties and high costs in treating organic wastewater.

[0004] Therefore, there is an urgent need for a new technology to reduce, recycle, and harmlessly dispose of coal gasification slag, improve its utilization rate, and alleviate or eliminate environmental problems. Summary of the Invention

[0005] The purpose of this invention is to provide a device and method for the graded recycling of industrial gasification slag, which solves the technical problems of low residual carbon recovery rate, secondary pollution, difficulty in treating organic wastewater, and high cost in current coal gasification slag decarbonization technology.

[0006] To achieve the above objectives, the present invention provides a device for the graded recycling of industrial gasification slag, comprising:

[0007] The sorting and processing mechanism is used to separate and sort gasification slag, including a hot blast stove, a cyclone separator, a sorting machine and a finished product bin. The hot blast stove is connected to the cyclone separator, the cyclone separator is connected to the sorting machine, and the sorting machine is connected to the finished product bin.

[0008] A heat utilization mechanism for fully utilizing the heat of the system includes a heated floor heating system, a condenser, a condensate tank, and a delivery pump. The heated floor heating system is connected to the condenser, the condenser is connected to the condensate tank, and the condensate tank is connected to the delivery pump.

[0009] A water circulation mechanism for recycling system water includes a circulating water tank and a circulating pump. The circulating water tank is connected to the heated underfloor heating system, and the circulating pump is connected to the circulating water tank.

[0010] Preferably, the system further includes a feeding and conveying mechanism, which includes a first elevator, a biomass fuel bin, and a weighing feeder. The first elevator is connected to the biomass fuel bin, the biomass fuel bin is connected to the weighing feeder, and the weighing feeder is connected to the hot air furnace.

[0011] Preferably, it further includes a feeding and mixing mechanism, which includes a twin-shaft mixing and dispersing machine, a weighing conveyor, and a second elevator. The weighing conveyor is connected to the heated floor heating system, the twin-shaft mixing and dispersing machine is connected to the weighing conveyor and the cyclone separator, and the second elevator is connected to the cyclone separator and the twin-shaft mixing and dispersing machine.

[0012] Preferably, the system further includes a dust removal mechanism, which includes a dust collector, an induced draft fan, and a dust silo. The inlet of the dust collector is connected to the sorting machine and the finished product silo, the outlet of the dust collector is connected to the dust silo, and the dust collector is connected to the induced draft fan.

[0013] Preferably, the heat utilization mechanism further includes a high-temperature sleeve heat exchanger, a preheating jacket disposed on the twin-shaft mixer, and a heat exchange tube disposed on the cyclone separator, wherein the high-temperature sleeve heat exchanger, the preheating jacket, and the heat exchange tube are connected by pipelines.

[0014] Preferably, the feeding and conveying mechanism further includes a dry slag bin and a screw weighing conveyor, wherein the dry slag bin is connected to the finished product bin, and the screw weighing conveyor is connected to the dry slag bin and the hot blast furnace.

[0015] Preferably, the return port of the circulating water tank is connected to the outlet of the heated floor heating system, the outlet of the circulating water tank is connected to the inlet of the circulating pump, and the outlet of the circulating pump is connected to the heat exchange tubes on the condenser and the cyclone separator, respectively.

[0016] Preferably, the inlet of the heated floor heating system is connected to the outlet of the preheating jacket and the outlet of the condenser.

[0017] Preferably, a first double-sided unloader is connected to the finished product silo, and / or a second double-sided unloader is connected to the powder and ash silo.

[0018] This invention also provides a method for the graded recycling of industrial gasification slag, the method utilizing the equipment for graded recycling of industrial gasification slag provided in any of the above-mentioned schemes, comprising:

[0019] Fuel is fed into the hot blast stove for heating and combustion to generate high-temperature flue gas, which is used to dry the wet gasified slag. The gasified slag is then separated into coarse and fine slag in the cyclone separator.

[0020] The separated fine residue is fed into the separator, which performs weight-based grading and screening of the fine residue.

[0021] The fine slag with high carbon content obtained from screening is transported into the finished product bin by the sorting machine. After the finished product in the finished product bin reaches the set material level, the finished product can be transported into the hot blast stove as fuel for the hot blast stove.

[0022] Compared to the aforementioned background technology, the industrial gasification slag grading and recycling equipment provided by this invention includes a feeding and conveying mechanism, a sorting and processing mechanism, a heat utilization mechanism, and a water circulation mechanism. The recycling method directly employs dry carbon-ash separation. During the grading and recycling process, while removing moisture, the calorific value of the finished gasification slag is significantly increased. The separated gasification coarse slag and fine ash can be directly applied to industries such as cement and building materials, achieving comprehensive utilization of gasification slag. Compared to the traditional wet decarbonization process for gasification slag, it reduces land occupation and investment, consumes almost no water resources during operation, and can recover condensate generated during system operation. The collected condensate volume is large and the water quality is good; after simple treatment, it can be used in industrial enterprises without generating secondary pollution. During the carbon-ash separation process of the gasification slag, the heat utilization mechanism recovers and fully utilizes the heat of the entire system, improving the system's thermal energy utilization rate. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the equipment for graded recycling of industrial gasification slag provided in an embodiment of the present invention.

[0025] Figure 2 This is a flowchart illustrating a method for graded recycling of industrial gasification slag provided in an embodiment of the present invention.

[0026] Figure 1 and Figure 2 Chinese reference numerals: 10. Feeding and conveying mechanism; 11. First elevator; 12. Biomass fuel bin; 121. Purifier; 13. Weighing feeder; 14. Dry slag bin; 15. Screw weighing conveyor; 20. Sorting and processing mechanism; 21. Hot air furnace; 211. Feed hopper; 212. Blower; 22. Cyclone separator; 221. Distributor; 23. Sorter; 24. Finished product bin; 241. First double-sided unloader; 242. First bulk feeder; 243. Powder feeder; 244. Roots blower; 30. Heat utilization mechanism; 31. Underfloor heating; 32. Condenser; 321. Filter 322. Mixer; 33. Condensate tank; 34. Transfer pump; 35. High-temperature sleeve heat exchanger; 351. Venturi tube; 352. Valve II; 353. Valve III; 36. Preheating jacket; 37. Heat exchange tube; 38. Valve I; 40. Water circulation mechanism; 41. Circulating water tank; 42. Circulating pump; 50. Dust removal mechanism; 51. Dust collector; 52. Exhaust fan; 53. Ash silo; 531. Second double-sided unloader; 532. Second bulk loader; 533. Mixing and humidifying machine; 60. Feeding and mixing mechanism; 61. Twin-shaft mixing and dispersing machine; 62. Weighing conveyor; 63. Second elevator. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] This invention provides a device for the graded recycling of industrial gasification slag, which can reduce, recycle, and harmlessly dispose of industrial gasification slag, improve its utilization rate, and effectively alleviate or eliminate environmental problems.

[0030] Please refer to Figure 1 The present invention provides an equipment for the graded recycling of industrial gasification slag, comprising a feeding and conveying mechanism 10, a sorting and processing mechanism 20, a heat utilization mechanism 30, and a water circulation mechanism 40.

[0031] Please refer to Figure 1 The feeding and conveying mechanism 10 includes a first elevator 11, a biomass fuel bin 12, and a weighing feeder 13. The first elevator 11 is connected to the biomass fuel bin 12, and the biomass fuel bin 12 is connected to the weighing feeder 13. Biomass fuel is lifted through the feed end of the first elevator 11 and then conveyed into the biomass fuel bin 12 through the discharge end of the first elevator 11. The biomass fuel is then conveyed to the weighing feeder 13 through the discharge port at the bottom of the biomass fuel bin 12. The weighing feeder 13 is used to weigh and convey the biomass fuel, and it supplies the biomass fuel from the biomass fuel bin 12 to the sorting and processing mechanism 20.

[0032] Please refer to Figure 1 The sorting and processing unit 20 is used to dry the gasification slag with high-temperature flue gas generated by fuel combustion and to separate and sort the gasification slag. The sorting and processing unit 20 includes a hot air furnace 21, a cyclone separator 22, a sorting machine 23 and a finished product bin 24. The hot air furnace 21 is connected to the cyclone separator 22, the cyclone separator 22 is connected to the sorting machine 23, and the sorting machine 23 is connected to the finished product bin 24.

[0033] A feed hopper 211 is provided on the hot blast stove 21. The weighing feeder 13 is connected to the hot blast stove 21. Biomass fuel enters the hot blast stove 21 through the feed hopper 211 of the hot blast stove 21 via the discharge port of the weighing feeder 13. The biomass fuel is burned in the hot blast stove 21 to generate high-temperature flue gas, which is used for drying gasification slag.

[0034] The outlet of the hot blast stove 21 is connected to the inlet of the cyclone separator 22. After the biomass fuel is burned in the hot blast stove 21, high-temperature flue gas is generated. The gasified wet slag is added to the high-temperature flue gas pipe through a venturi tube 351, and then separated in the cyclone separator 22 to obtain coarse and fine slag. The coarse slag outlet at the bottom of the cyclone separator 22 is connected to a distributor 221, which is also connected to the inlet of the distributor 221. The coarse slag is discharged through the outlet of the distributor 221. The fine slag outlet at the top of the cyclone separator 22 is connected to the inlet of the separator 23, and the fine slag enters the separator 23 from the fine slag outlet at the top of the cyclone separator 22.

[0035] The discharge port of the separator 23 is connected to the inlet of the finished product bin 24. The separator 23 is used to perform weight classification screening of fine slag materials. The heavier fine slag materials obtained from the classification screening enter the finished product bin 24 from the discharge port of the separator 23.

[0036] Please refer to Figure 1The equipment for the graded recycling of industrial gasification slag provided by this invention also includes a dust removal mechanism 50. The dust removal mechanism 50 includes a dust collector 51, an induced draft fan 52, and a dust silo 53. The inlet of the dust collector 51 is connected to the separator 23 and the finished product silo 24, and the outlet of the dust collector 51 is connected to the dust silo 53. The dust collector 51 is also connected to the induced draft fan 52. Specifically, the inlet of the dust collector 51 is connected to the outlet of the separator 23 and the outlet of the finished product silo 24. The lighter, finer slag material obtained from the grading and screening by the separator 23 and the powdery material in the finished product silo 24 enter the dust collector 51. The outlet of the dust collector 51 is connected to the inlet of the dust silo 53, and the outlet of the dust collector 51 is connected to the inlet of the induced draft fan 52. A gravity flap valve is installed at the bottom of the dust collector 51, and the gravity flap valve is located at the outlet of the dust collector 51.

[0037] Please refer to Figure 1 The heat utilization mechanism 30 is used to fully utilize the system's heat. The heat utilization mechanism 30 includes a heated floor heating system 31, a condenser 32, a condensate tank 33, and a transfer pump 34. The heated floor heating system 31 is connected to the condenser 32, the condenser 32 is connected to the condensate tank 33, and the condensate tank 33 is connected to the transfer pump 34. The heated floor heating system 31 is used to heat the gasified wet slag. The air outlet of the induced draft fan 52 is connected to the air inlet of the condenser 32, the water inlet of the condenser 32 is connected to the water circulation mechanism 40, the water outlet of the condenser 32 is connected to the inlet of the condensate tank 33, and the outlet of the condensate tank 33 is connected to the transfer pump 34. The condensate can be sent to a wastewater treatment plant or other devices for recycling via the transfer pump 34.

[0038] Please refer to Figure 1 The water circulation mechanism 40 is used to recycle the system water. The water circulation mechanism 40 includes a circulating water tank 41 and a circulating pump 42. The circulating water tank 41 is connected to the underfloor heating system 31, and the circulating pump 42 is connected to the circulating water tank 41. Specifically, the inlet of the circulating water tank 41 is connected to the production water in the external pipe, the return outlet of the circulating water tank 41 is connected to the outlet of the underfloor heating system 31, the outlet of the circulating water tank 41 is connected to the inlet of the circulating pump 42, and the outlet of the circulating pump 42 is connected to the inlet pipe of the condenser 32 and the cyclone separator 22, respectively.

[0039] In addition to using production water, the circulating water tank 41 can also use circulating water or demineralized water, with demineralized water being preferred. This can avoid the possibility of scaling caused by repeated heating of the pipeline, reduce the thermal conductivity, and reduce the need for pipeline cleaning.

[0040] Please refer to Figure 1The equipment for graded recycling of industrial gasification slag provided by this invention also includes a feeding and mixing mechanism 60. The feeding and mixing mechanism 60 includes a twin-shaft mixing and dispersing machine 61, a weighing conveyor 62, and a second elevator 63. The weighing conveyor 62 is connected to the underfloor heating system 31. The twin-shaft mixing and dispersing machine 61 is connected to the weighing conveyor 62 and the cyclone separator 22. The second elevator 63 is connected to the cyclone separator 22 and the twin-shaft mixing and dispersing machine 61. The weighing conveyor 62 is a belt conveyor with weighing function. The twin-shaft mixing and dispersing machine 61 has mixing and dispersing functions. Specifically, the internal conveying of the twin-shaft mixing and dispersing machine 61 uses twin-shaft mixing to fully mix dry and wet materials. The discharge end is equipped with dispersing blades to disperse the materials, facilitating subsequent drying. Thus, the twin-shaft mixing and dispersing machine 61 can mix and disperse coarse and wet slag.

[0041] Specifically, the coarse slag inlet of the twin-shaft mixing and dispersing machine 61 is connected to the discharge end of the second elevator 63, the wet slag inlet of the twin-shaft mixing and dispersing machine 61 is connected to the discharge end of the weighing conveyor 62, and the discharge outlet of the twin-shaft mixing and dispersing machine 61 is connected to the feed pipe of the cyclone separator 22. The heated wet slag from the heated floor heating system 31 is conveyed to the twin-shaft mixing and dispersing machine 61 via the weighing conveyor 62, and the coarse slag separated by the cyclone separator 22 is conveyed to the twin-shaft mixing and dispersing machine 61 via the second elevator 63.

[0042] In some of these embodiments, please refer to Figure 1 The heat utilization mechanism 30 also includes a high-temperature sleeve heat exchanger 35, a preheating jacket 36 installed on the twin-shaft mixing and dispersing machine 61, and a heat exchange tube 37 installed on the cyclone separator 22, with the heat exchange tube 37 wound around the bottom of the cyclone separator 22.

[0043] The high-temperature jacket heat exchanger 35 is used to utilize the heat from the high-temperature flue gas of the hot blast stove 21, where the temperature of the high-temperature flue gas at the outlet of the hot blast stove 21 is approximately 650–1000°C. This heat is used to heat the circulating water. Heat exchange tubes 37 are installed to exchange heat with the coarse slag material located at the bottom of the cyclone separator 22, thereby lowering the temperature of the coarse slag material. A preheating jacket 36 is installed on the twin-shaft mixing and dispersing machine 61 to heat the wet slag to 75–85°C.

[0044] Specifically, the air inlet of the high-temperature sleeve heat exchanger 35 is connected to the high-temperature flue gas outlet of the hot blast furnace 21, and the air outlet of the high-temperature sleeve heat exchanger 35 is connected to the air inlet of the cyclone separator 22. The water inlet of the heat exchange tube 37 is connected to the circulating pump 42, the water inlet of the high-temperature sleeve heat exchanger 35 is connected to the water outlet of the heat exchange tube 37, the water outlet of the high-temperature sleeve heat exchanger 35 is connected to the water inlet of the preheating jacket 36, and the water outlet of the preheating jacket 36 is connected to the water outlet pipeline of the condenser 32.

[0045] In some of these embodiments, please refer to Figure 1 The water flowing out of the outlet of the condenser 32 and the water flowing out of the outlet of the preheating jacket 36 are mixed by the mixer 322 and then delivered to the heating floor heating 31. This setting can ensure that the temperature is relatively constant.

[0046] In some of these embodiments, please refer to Figure 1 The bottom outlet of the finished product silo 24 is connected to a first double-sided unloader 241. One outlet of the first double-sided unloader 241 is connected to a first bulk loader 242, through which the finished product is discharged and loaded onto trucks for transport. The other outlet of the first double-sided unloader 241 is connected to a powder feeder 243, which is connected to a dry slag silo 14, allowing materials to be conveyed into the dry slag silo 14 for processing. The powder feeder 243 is connected to a Roots blower 244, which provides the air source power for the powder feeder 243.

[0047] In some of these embodiments, please refer to Figure 1 The bottom outlet of the dust silo 53 is connected to a second double-sided unloader 531. One of the outlets of the second double-sided unloader 531 is connected to a second bulk loader 532. The dust can be discharged, packaged and transported by truck through the second bulk loader 532. The other outlet of the second double-sided unloader 531 is connected to a mixing and humidifying machine 533. The dust can also be humidified by the mixing and humidifying machine 533 and then loaded and transported by truck.

[0048] It should be noted that the first double-sided unloader 241 and the second double-sided unloader 531 are equipped with fluidizing gas inlets to ensure smooth and uniform material discharge.

[0049] In some of these embodiments, please refer to Figure 1 The feeding and conveying mechanism 10 also includes a dry slag bin 14 and a screw weighing conveyor 15. The dry slag bin 14 is connected to the powder feeder 243. The discharge port of the powder feeder 243 is connected to the inlet of the dry slag bin 14. The discharge port of the dry slag bin 14 is connected to the screw weighing conveyor 15. The screw weighing conveyor 15 is connected to the hot blast furnace 21. The material is conveyed from the dry slag bin 14 into the hot blast furnace 21 through the screw weighing conveyor 15.

[0050] In some of these embodiments, please refer to Figure 1 A distributor 221 is connected to the bottom outlet of the cyclone separator 22. The distributor 221 has two outlets. One outlet is connected to the inlet of the second elevator 63. The coarse slag can be transported to the twin-shaft mixing and dispersing machine 61 through the second elevator 63. The coarse slag can also be discharged through the other outlet and loaded onto a truck for transportation.

[0051] In some of these embodiments, please refer to Figure 1 The top of the biomass fuel storage 12 is equipped with a purifier 121, which can filter and purify the exhaust gas of the biomass fuel storage 12. The filtered and purified exhaust gas will not affect the environment when it is discharged into the air.

[0052] In some of these embodiments, please refer to Figure 1 A blower 212 is connected to the hot air furnace 21. The air inlet of the hot air furnace 21 is connected to the air outlet of the blower 212, so that fresh air is introduced into the hot air furnace 21 by the blower 212 to assist combustion.

[0053] The ash produced by the combustion of biomass fuel in the hot blast stove 21 is discharged through the ash outlet and transported by truck. It should be noted that the hot blast stove 21 is equipped with an ignition device. Considering the characteristics of both biomass and gasification ash, in this embodiment, the hot blast stove 21 uses natural gas or liquefied petroleum gas as the ignition medium, ensuring rapid, convenient, safe, and efficient ignition. In actual use, either biomass pellet fuel or gasification ash can be added to the hot blast stove 21.

[0054] In some of these embodiments, please refer to Figure 1 A Venturi tube 351 is installed on the pipeline connecting the high-temperature sleeve heat exchanger 35 and the cyclone separator 22. The gasified fine slag is sucked into the conveying pipeline by relying on the Venturi effect and can be mixed and conveyed at the same time as unloading.

[0055] In some of these embodiments, please refer to Figure 1 The outlet of the condenser 32 is equipped with a steam trap assembly (not shown) and a filter 321. The steam trap assembly is used to separate non-condensable steam and condensate. The non-condensable steam is released after passing through the filter 321.

[0056] Based on the aforementioned equipment for the graded recycling of industrial gasification slag, this invention also provides a method for the graded recycling of industrial gasification slag. Taking the comprehensive treatment of fine industrial gasification slag as an example: the wet gasification slag has a moisture content of 55% (wt), a net calorific value of 1000 kcal / kg (as received), an ash content of 53.5% (dried basis), a fixed carbon content of 42.6% (dried basis), and a volatile matter content of 3.9% (dried basis), with a total processing capacity of 600 t / d. To prevent scaling and ensure operational efficiency, the system uses demineralized water, with a feed water temperature of 35℃ and an outlet temperature of approximately 700℃ for the hot blast furnace 21.

[0057] The recycling method is as follows: fuel is put into a hot air furnace for heating and combustion to generate high-temperature flue gas to dry the wet gasification slag. The gasification slag is then separated into coarse slag and fine slag in a cyclone separator.

[0058] The separated fine residue is fed into a separator, which performs weight-based grading and screening of the fine residue.

[0059] The fine slag with higher carbon content obtained from screening is transported into the finished product bin by the separator. After the finished product reaches the set material level in the bin, it can be transported into the hot blast stove as fuel. The lighter components with lower carbon content are collected in the ash bin, loaded onto trucks and transported for comprehensive utilization.

[0060] The above method specifically includes at least the following steps:

[0061] The preheating preparations for the hot air furnace 21 and the system preheating are complete. Valves 2 (352) and 1 (38) on the pipeline are closed, and all other valves are open.

[0062] Demineralized water is introduced into the circulating water tank 41. When the demineralized water in the circulating water tank 41 reaches the normal level, the circulating pump 42 is started. When the demineralized water in the circulating water tank 41 reaches the set level, the water supply is stopped.

[0063] Start the first elevator 11 and begin adding biomass fuel. After the biomass fuel in the biomass fuel bin 12 reaches the normal material level, the hot air furnace 21 is ignited. Then, start the blower 212 and the weighing feeder 13. With the addition of fuel, the hot air furnace 21 begins to burn biomass fuel normally.

[0064] Start the induced draft fan 52, the separator 23, the twin-shaft mixing and dispersing machine 61, and the weighing conveyor 62 in sequence, with an interval of 30 seconds;

[0065] The gasified wet slag is spread on the heated floor heating 31 and turned over as needed to quickly dissipate the moisture. When the moisture content of the gasified wet slag is reduced to 30-45% (wt), the gasified wet slag is dehumidified and dried by the heated floor heating 31 until the moisture content reaches the required 45%, and then it is fed through the weighing conveyor 62.

[0066] When the gasified wet slag reaches the discharge port of the twin-shaft mixing and dispersing machine 61, close valve 353 and open valve 252.

[0067] After the ash and hot air are separated, they pass through condenser 32. The humid air condenses into water, which is then separated by the steam trap group and collected in condensate tank 33. The non-condensable steam is filtered through filter 321 to remove fine dust before being released into the air.

[0068] As the system operates, after enough coarse slag accumulates at the bottom of the cyclone separator 2211, the second elevator 63 is started to provide mixed coarse slag to the twin-shaft mixing and dispersing machine 61, improving the dispersing and subsequent drying efficiency. The proportion of mixed coarse slag returned is about 10% to 20%; excess coarse slag is loaded onto trucks and transported off-site.

[0069] When the liquid level in the condensate tank 33 reaches the high level, the transfer pump 34 is started to send the condensate out for recycling, thus saving water resources.

[0070] After the system is running normally, once the finished product bin 24 reaches the set material level, the first double-sided unloader at the bottom 241 introduces homogenizing compressed air, starts the Roots blower 244, and sends the finished material to the dry slag bin 14 via the powder feeder 243 as fuel for the hot blast stove 21. Since the finished material has a high carbon content after carbon and ash separation, it can be burned. The hot blast stove 21 of the system can directly use the finished gasification slag as fuel, or it can be loaded onto trucks by a bulk loader and transported out as finished fuel for sale.

[0071] After the powder silo 53 reaches the set material level, the bottom second double-sided unloader 531 introduces homogenizing compressed air. According to the requirements of the customer, it can be loaded onto trucks and transported out as raw material for industries such as cement and building materials.

[0072] After the system is running stably, the circulating water recovers heat energy through the condenser 32, cyclone separator 22, and high-temperature sleeve heat exchanger 35. The circulating water temperature in the circulating water tank 41 is usually 30-40℃. After preheating in the cyclone separator 22, the temperature is 40-50℃. After passing through the high-temperature sleeve heat exchanger 35, it is heated to 85-95℃, and then heats the material in the twin-shaft mixing and dispersing machine 61. After heat exchange, the water temperature is 75-85℃, and after mixing with the liquid from the condenser 32, the temperature is 70-80℃. Then it enters the heating system 31, which is used to pre-dry the high-moisture initial gasification wet slag, reducing its moisture content from 55% to 45%. According to needs, this part of the evaporated water can be recovered. The collected condensate volume is not less than 8t / h. After the temperature is reduced to 30-40℃, it is returned to the circulating water tank 41. Thus, the entire system recovers and fully utilizes heat, improving the system's thermal energy utilization rate.

[0073] The gasification slag product obtained by the above treatment method has a moisture content of 10%. After the system separates carbon and ash, due to the change in the removal rate of coarse slag and fine ash with low carbon content, the amount of finished gasification slag is 7-8 t / h, and the received basis lower calorific value is 3200-3500 kcal / kg. It can be directly sold as fuel or fed into the hot blast stove 21 of this system to provide heat energy for the entire system, reducing the transportation cost of fuel for the hot blast stove 21 and reducing operating costs.

[0074] Understandably, the system can also install heating coils outside the hot air furnace 21 to recover heat energy and reduce heat loss in the hot air furnace 21 system.

[0075] The method for graded recycling of industrial gasification slag provided by this invention directly employs dry carbon-ash separation, which removes moisture while significantly increasing the calorific value of the finished gasification slag, allowing it to be used directly as industrial fuel. The separated coarse gasification slag and fine ash can be directly used in the cement and building materials industries, achieving comprehensive utilization of gasification slag. Compared to traditional wet decarbonization processes for gasification slag, this method reduces land occupation and investment, eliminates the need for water consumption, allows for water recycling, prevents secondary pollution, and collects a large volume of high-quality condensate, which can be used in industrial enterprises after simple treatment.

[0076] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0077] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A device for the graded recycling of industrial gasification slag, characterized in that, include: The sorting and processing mechanism is used to separate and sort gasification slag, including a hot blast stove, a cyclone separator, a sorting machine and a finished product bin. The hot blast stove is connected to the cyclone separator, the cyclone separator is connected to the sorting machine, and the sorting machine is connected to the finished product bin. A heat utilization mechanism for fully utilizing the heat of the system includes a heated floor heating system, a condenser, a condensate tank, and a delivery pump. The heated floor heating system is connected to the condenser, the condenser is connected to the condensate tank, and the condensate tank is connected to the delivery pump. A water circulation mechanism for recycling system water includes a circulating water tank and a circulating pump. The circulating water tank is connected to the heated underfloor heating system, and the circulating pump is connected to the circulating water tank. It also includes a feeding and conveying mechanism, which comprises a first elevator, a biomass fuel bin, and a weighing feeder. The first elevator is connected to the biomass fuel bin, the biomass fuel bin is connected to the weighing feeder, and the weighing feeder is connected to the hot blast stove. The feeding and conveying mechanism also includes a dry slag bin and a screw weighing conveyor. The dry slag bin is connected to the finished product bin, and the screw weighing conveyor is connected to both the dry slag bin and the hot blast stove. It also includes a feeding and mixing mechanism, which includes a twin-shaft mixing and dispersing machine, a weighing conveyor and a second elevator. The weighing conveyor is connected to the heated underfloor heating system. The twin-shaft mixing and dispersing machine is connected to the weighing conveyor and the cyclone separator. The second elevator is connected to the cyclone separator and the twin-shaft mixing and dispersing machine. The heat utilization mechanism also includes a high-temperature sleeve heat exchanger, a preheating jacket installed on the twin-shaft mixer, and a heat exchange tube installed on the cyclone separator. The high-temperature sleeve heat exchanger, the preheating jacket, and the heat exchange tube are connected by pipelines. The return port of the circulating water tank is connected to the outlet of the heated floor heating system, the outlet of the circulating water tank is connected to the inlet of the circulating pump, and the outlet of the circulating pump is connected to the heat exchange tubes on the condenser and the cyclone separator, respectively. The inlet of the heated floor heating system is connected to the outlet of the preheating jacket and the outlet of the condenser. The gasified wet slag is laid on the heated underfloor heating system, and the heated underfloor heating system dehumidifies and dries it until the moisture content meets the requirements.

2. The equipment for graded recycling of industrial gasification slag according to claim 1, characterized in that, It also includes a dust removal mechanism, which includes a dust collector, an induced draft fan, and a dust silo. The inlet of the dust collector is connected to the sorting machine and the finished product silo, the outlet of the dust collector is connected to the dust silo, and the dust collector is connected to the induced draft fan.

3. The equipment for graded recycling of industrial gasification slag according to claim 2, characterized in that, The finished product silo is connected to a first double-sided unloader, and / or the powder and ash silo is connected to a second double-sided unloader.

4. A method for graded recycling of industrial gasification slag, characterized in that, The process of graded recycling of industrial gasification slag using the equipment described in any one of claims 1-3 includes: Fuel is fed into the hot blast stove for heating and combustion to generate high-temperature flue gas, which is used to dry the wet gasified slag. The gasified slag is then separated into coarse and fine slag in the cyclone separator. The separated fine residue is fed into the separator, which performs weight-based grading and screening of the fine residue. The fine slag with high carbon content obtained from screening is transported into the finished product bin by the sorting machine. After the finished product in the finished product bin reaches the set material level, the finished product can be transported into the hot blast stove as fuel for the hot blast stove.

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