CN108117383B - Use method of rotary co-production furnace for roasting and activating circulating fluidized bed - Google Patents
Use method of rotary co-production furnace for roasting and activating circulating fluidized bed Download PDFInfo
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- CN108117383B CN108117383B CN201711451627.9A CN201711451627A CN108117383B CN 108117383 B CN108117383 B CN 108117383B CN 201711451627 A CN201711451627 A CN 201711451627A CN 108117383 B CN108117383 B CN 108117383B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/02—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed
- F23C10/04—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone
- F23C10/08—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases
- F23C10/10—Fluidised bed combustion apparatus with means specially adapted for achieving or promoting a circulating movement of particles within the bed or for a recirculation of particles entrained from the bed the particles being circulated to a section, e.g. a heat-exchange section or a return duct, at least partially shielded from the combustion zone, before being reintroduced into the combustion zone characterised by the arrangement of separation apparatus, e.g. cyclones, for separating particles from the flue gases the separation apparatus being located outside the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C10/00—Fluidised bed combustion apparatus
- F23C10/18—Details; Accessories
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/42—Non metallic elements added as constituents or additives, e.g. sulfur, phosphor, selenium or tellurium
- C04B2235/422—Carbon
Abstract
The invention relates to the technical field of environmental protection and resource recycling comprehensive utilization, in particular to a use method of a rotary co-production furnace for roasting and activating a circulating fluidized bed. The method is characterized in that: the device comprises a roasting and activating rotary furnace, a circulating fluidized bed coal-fired boiler and an electric bag dust catcher, wherein the roasting and activating rotary furnace is designed between a combustion system and a heat exchange system of the circulating fluidized bed coal-fired boiler, specifically, a hot air duct of the roasting and activating rotary furnace is connected with a cyclone separator of the circulating fluidized bed coal-fired boiler, high-temperature flue gas discharged by a winnowing machine of the roasting and activating rotary furnace exchanges heat through a superheater, an economizer and an air preheater of the circulating fluidized bed coal-fired boiler in sequence, and the electric bag dust catcher is a finished product catching device of the roasting and activating rotary furnace and an environment-friendly processing device of waste gas particles of the circulating fluidized bed coal-fired boiler.
Description
Technical Field
The invention relates to the technical field of environmental protection and resource recycling comprehensive utilization, in particular to a use method of a rotary co-production furnace for roasting and activating a circulating fluidized bed.
Background
The kaolin has wide application, is mainly used in the industries of paper making, ceramics, rubber and plastics, chemical industry, coating, medicine and the like, and has the main mineral component of kaolinite, wherein the crystal chemical formula of the kaolinite is 2SiO2·Al2O3·2H2Removing organic matters and reconstructing crystal lattices by a calcining process; the mechanical crushing and the air flow crushing have enough fineness to meet the requirements of preparing fillers, paper-making coatings, molecular sieves and catalyst carriers of cable plastics, rubber sealing rings and the like. Fly ash of circulating fluidized bed coal-fired boiler is the most common waste in the production process of boiler, and the main component of fly ash is SiO2、Al2O3Is the source of occupational disease hazard factors of pneumoconiosis, has great harm to personnel in a workplace, is easy to cause occupational diseases of the pneumoconiosis and the like, causes pollution to the environment by dust dissipated in the air, changes waste into valuable and prepares kaolin by high-value utilization, which is a problem that engineering technicians in the technical field want to solve, wherein the actual problems to be solved comprise obtaining enough fineness, adding various proportioning guiding agents and proper process equipment, thereby ensuring that the kaolin is prepared by sufficient fineness and proper process equipmentKaolin prepared by the fly ash of the circulating fluidized bed coal-fired boiler meets the chemical composition and physical performance indexes required by the industries of paper making, ceramics, rubber and plastics, coatings and enamel. Chinese invention patent (CN 201610683499.X, patent name is sludge drum external heat drying and circulating fluidized bed incineration integrated and tail gas purification device) discloses a sludge drum external heat drying and circulating fluidized bed incineration integrated and tail gas purification device, which is characterized in that: the drying system comprises a rotary kiln roller, a fan and a condenser, the rotary kiln roller is arranged on a tail flue of the circulating fluidized bed in an inserting mode, and water vapor and odor generated in the wet sludge drying process are sent into a hearth of the circulating fluidized bed to be combusted and deodorized after being condensed by the condenser to remove moisture; two air preheaters are arranged in the tail flue and are respectively connected with a primary air port and a secondary air port arranged on a hearth of the circulating fluidized bed; the tail gas purification system comprises an active carbon injection device, a bag-type dust remover and a wet desulphurization system which are sequentially arranged behind an air preheater; a gas conveying pipe is arranged between the bag-type dust collector and the wet desulphurization system and is connected with a primary air port; the invention is used for drying and incinerating sludge. The Chinese invention patent (with the patent number of CN201510884574.4, the patent name is a poly-generation system and method taking coal pyrolysis as a guide) discloses a poly-generation system and method taking coal pyrolysis as a guide, which is characterized by comprising a coal pyrolysis unit and a semicoke combustion power generation unit which can independently operate; the coal pyrolysis unit comprises a dryer, a preheater, a pyrolysis kiln, a high-temperature gas filter, a pyrolysis gas cooling and waste heat recovery device, a second cooler, a tar electric catcher and a fluidized bed furnace connected with the pyrolysis kiln, wherein the dryer, the preheater, the pyrolysis kiln, the high-temperature gas filter, the pyrolysis gas cooling and waste heat recovery device, the second cooler and the tar electric catcher are sequentially connected; the semicoke combustion power generation unit comprises a circulating fluidized bed boiler connected with the pyrolysis kiln, a waste heat recovery boiler and a slag cooler connected with the circulating fluidized bed boiler, a steam turbine connected with the circulating fluidized bed boiler and the waste heat recovery boiler, and a power generator connected with the steam turbine; the pyrolysis gas cooling and waste heat recovery device, the waste heat recovery boiler and the slag cooler are all connected with the dryer and used for providing hot flue gas for the dryer; heat generated by pyrolysis of coal pyrolysis unitThe most of the semi-coke directly enters a circulating fluidized bed boiler to be combusted and generate power, and the other small part of the semi-coke enters a fluidized bed boiler to generate hot flue gas required by pyrolysis; when one of the coal pyrolysis unit and the semicoke combustion power generation unit breaks down, the coupling link is cut off, and the other unit can still independently operate.
The technical scheme provided by the prior art 1 aims at providing a sludge roller external heat drying and circulating fluidized bed incineration integrated and tail gas purification device, which is closer to the design scheme of the scheme, but the outlet temperature of a hearth of a circulating fluidized bed coal-fired boiler is 900 +/-50 ℃, the roasting and activating temperature of kaolin is required to reach 900-1280 ℃, and the rotary kiln roller is arranged on a tail flue of the circulating fluidized bed in an inserting manner and is heated only by drying, so that the process temperature condition required by roasting and activating cannot be met; in the prior art 2, thermal-state semi-tar gas generated after the coal is cracked in the rotary kiln is sent to a circulating fluidized bed boiler for combustion and power generation, and the other part of the semi-tar gas is sent to the fluidized bed boiler to generate hot air for supplying heat required by cracking the coal, so that the cyclic comprehensive utilization of fly ash of the circulating fluidized bed coal is not mentioned.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a method for using a circulating fluidized bed roasting activation rotary co-production furnace, which is characterized by comprising the following steps:
step one, the coal enters a cyclone separator after fluidized combustion in a hearth of a circulating fluidized bed coal-fired boiler, larger high-temperature solid particles separated by the cyclone separator enter a material returning system, the high-temperature solid particles form a material column in a vertical pipe of a material returning device, a U-shaped valve is arranged between the vertical pipe and a material returning pipe, an isobaric air chamber is arranged at the bottom of the U-shaped valve to supply air so as to ensure the fluidization of the high-temperature solid particles, the pressure difference between the material column in the vertical pipe and the hearth pressure drives the high-temperature solid particles to be continuously conveyed to the hearth through the material returning pipe for secondary combustion, the outlet end of the material returning pipe is provided with a guide pipe, smoke is led out through an air inlet to ensure that the guide chamber is always in a negative pressure state, thereby reducing the chamber pressure at the outlet of the return pipe, the high-temperature coal particles falling into the negative pressure chamber are blown by the blowing chamber to be cooled and fluidized and are discharged through the air inducing port, meanwhile, the fly ash of the coal-fired boiler of the circulating fluidized bed discharged by the cyclone separator is carried by high-temperature flue gas and is sent into a roasting activation rotary furnace to be used as a raw material for preparing kaolin.
And step two, the carrier roller assembly comprises a roller group and a base, two groups of roller group assemblies are embedded in the front and the back of the roasting activation rotary cylinder body, the positioning frame is arranged on the carrier roller assembly, the ring gear is embedded on the roasting activation rotary cylinder body, the roasting activation rotary cylinder body is driven to rotate around the central axis of the roasting activation rotary cylinder body under the driving of the driving gear assembly, and the driving gear assembly comprises a driving gear and a transmission system.
And step three, the roasting activation rotary furnace barrel assembly comprises a mechanical seal assembly I, a ring gear, a roasting activation rotary barrel, a roller way assembly, a high-aluminum ball stack layer and a mechanical seal assembly II, wherein the high-aluminum ball stack layer is laid in the roasting activation rotary barrel, spherical fillers with different diameters are formed on the high-aluminum ball stack layer due to abrasion and continuous supplement, and the high-aluminum balls continuously roll and rub with each other in the roasting activation rotary barrel when rotating along with the roasting activation rotary barrel.
And step four, conveying materials such as a guiding agent and the like into an injector by a screw conveyor of the distributor, simultaneously guiding and flapping the fly ash of the coal-fired boiler with the circulating fluidized bed carried by high-temperature flue gas into the injector from a hot air duct to a spiral blade of the distributor after the fly ash is mixed with the materials such as the guiding agent and the like through a diversion cone, throwing the fly ash to the inner wall of the roasting and activating rotary cylinder body along the rotation tangential direction of the spiral blade under the action of centrifugal force, losing kinetic energy to stay at the bottom under the actions of friction of the inner wall of the roasting and activating rotary cylinder body, blocking by the gravity, the spiral blade and the like, suspending the high-aluminum ball stack layer therebetween and performing friction grinding, and completing activation and grinding at the temperature of 900-1280 ℃.
And fifthly, designing inlets of the air separator as three spiral inlets uniformly distributed along the circumferential direction, so that a cyclone wind zone which is formed by short-circuiting smoke wind channels at two ends of a roasting and activating rotary furnace barrel assembly and guides a spiral blade to lift and spirally advance along the inner wall of the roasting and activating rotary cylinder can be avoided, and high-temperature smoke can enter the air separator after passing through the spiral cyclone wind zone lifted by the spiral blade, so that finished particles with uniform activation degree and fineness can be sorted.
And sixthly, after the high-temperature flue gas discharged from the air separator is subjected to heat exchange through a heat exchanger, a coal economizer and an air preheater in sequence, the temperature of the flue gas is reduced to 150-160 ℃, the flue gas carries kaolin finished product particles to enter an electric bag dust catcher, the flue gas is separated from the kaolin finished product particles, the kaolin finished product particles are caught by the electric bag dust catcher and sent to the next process, and the tail gas is treated by an environment-friendly facility and then is discharged after reaching the standard.
The inventor finds that the fire coal is burnt out at the temperature of 900 +/-50 ℃ in a circulating fluidized bed hearth, then is separated by a cyclone separator, coarse particles are returned to the hearth by a return feeder to be continuously combusted, the particle size of fine particles carried in the flue gas discharged by the cyclone separator is 38-58 mu m, and the main component is Al2O3、SiO2And unburned C, called circulating fluidized bed coal-fired boiler fly ash, which has good activity of the main component SiO2About 45-55% of Al2O3The content of the carbon is about 35-38%, the content of unburned C is about 3-5%, and the carbon is used as impurity Si in coal and forms SiO under the condition of low oxygen content after being burnt out at high temperature in a hearth of a coal-fired boiler of a circulating fluidized bed2Aerosol with Al2O3The unburned C particles are carried by high-speed flue gas, are crushed by impact, are separated at high temperature and enter a roasting activation rotary furnace, and have larger specific surface area and cation exchange capacity.
The inventor finds that in order to realize the high-value utilization of fly ash of a circulating fluidized bed coal-fired boiler for preparing kaolin, the requirements on chemical components and physical properties of the kaolin need to be met according to GB/T14563-2008 of kaolin and test method thereof, and although the specific requirements of various industries on kaolin fillers are not completely consistent, the fineness of the kaolin fillers is equal to that of Al2O3/SiO2The ratio is specified clearly, so that the fly ash of the circulating fluidized bed coal-fired boiler staying at the bottom of the roasting and activating rotary furnace is ground by utilizing the continuous rolling and mutual friction of the high-alumina balls in the roasting and activating rotary furnace along with the rotation of the high-alumina balls, and the Al is added at the high temperature of 900-1280 ℃ of roasting and activating2O3、SiO2The reconstruction of the crystal lattice is completed at the same timeThe intermolecular bond energy is reduced, the space is increased, kaolin finished products with the fineness of 1000-1200 meshes can be easily obtained under the friction grinding of the high-alumina balls, meanwhile, component particles fallen off by the mutual friction grinding of the high-alumina balls are also supplemented into the kaolin finished products, and impurities needing to be separated are not generated.
The inventor finds that if the high-value utilization of the fly ash of the circulating fluidized bed coal-fired boiler is realized, the waste heat of the high-temperature flue gas discharged by the roasting and activating rotary furnace is fully utilized, the technical scheme that the roasting and activating rotary furnace is designed between the combustion system and the heat exchange system of the circulating fluidized bed coal-fired boiler can realize the aim, in particular, a hot air duct of the roasting and activating rotary furnace is connected with a cyclone separator of the circulating fluidized bed coal-fired boiler, and the high-temperature flue gas discharged by a winnowing machine of the roasting and activating rotary furnace sequentially passes through a superheater, an economizer and an air preheater of the circulating fluidized bed coal-fired boiler for heat exchange.
The inventor finds that the design, installation, operation, maintenance and standard operation guide of the dust removing equipment (published by Jilin audio-video press, published in 2003, 9 months) clearly indicates that even if the dust is collected at high temperature, the smoke temperature of the electric bag dust remover cannot be higher than 400 ℃, the electric bag dust remover can meet the use conditions after the high-temperature smoke discharged by the roasting and activating rotary furnace is subjected to heat exchange and cooling through a heater, a coal economizer and an air preheater, and the electric bag dust remover achieves the purposes of being a finished product collecting device of the roasting and activating rotary furnace and an environment-friendly treatment device of waste gas particles of a circulating fluidized bed coal-fired boiler.
The inventor finds that the using temperature of roasting activation of the rotary roasting activation furnace is 900-1280 ℃, the temperature of a hearth of a coal-fired boiler of a circulating fluidized bed is 900 +/-50 ℃, and the fluidized layer, namely coking, loses a fluidized state after the temperature is exceeded, so that the rotary roasting activation furnace cannot normally run, meanwhile, the part of the hearth except for the fluidized layer is provided with a water wall heating surface, and a heating surface is not arranged, and the working temperature required by the rotary roasting activation furnace is realized by conveying fine coal powder inwards for combustion to supplement the required heat value.
The inventor finds that the material returning device is used for supplying air to high-temperature solid particles separated by the cyclone separator through the vertical pipe through the isobaric air chamber at the bottom and returning the air to the hearth for burning again through the material returning pipe, the U-shaped valve is arranged between the vertical pipe and the material returning pipe, and the isobaric air chamber is arranged at the bottom of the U-shaped valve for supplying air to ensure the fluidization of the high-temperature solid particles. The pressure difference between the material column in the vertical pipe and the hearth pressure is the guarantee for driving the high-temperature solid particles to be continuously conveyed to the hearth. Because the scheme is a circulating fluidized bed roasting and rotating integrated furnace, the discharge end of the roasting and activating rotary furnace is provided with a wind separator, the design requirement is lower in flue gas flow velocity so as to reduce the kinetic energy of the carried finished product particles and sort out the finished product particles with enough fineness, and the air supply to a hearth needs to overcome the resistance of parts such as the hearth, a cyclone separator, an injector, a spiral blade, a wind separator and the like, so the air supply requirement to the hearth of the circulating fluidized bed coal-fired boiler is high in air pressure and low in air volume, the pressure head of the hearth is higher, the height requirement of a material column of a vertical pipe is higher according to the requirement of the pressure difference balance between the material column in the vertical pipe and the hearth pressure, namely, the return quantity of high-temperature solid particles is high, and the ratio of the return quantity to the circulating fluidized bed coal-fired boiler entering the roasting and activating rotary furnace is determined by the cyclone separator, in other words, the load of the air separator increases and the separation efficiency decreases. In order to solve the problems, a guide chamber is designed at the outlet end of the return pipe, the guide chamber is in a negative pressure state, and the guide pipe beside the outlet of the return pipe is designed to reduce the local chamber pressure at the outlet of the return pipe, so that the height of a material column of a vertical pipe is reduced, the purposes of material balance and separation efficiency guarantee are achieved, and the circulating fluidized bed coal-fired boiler and the roasting activation rotary furnace can be effectively combined and normally run.
The inventor finds that to prevent the leakage of waste gas pollutants, reliable sealing needs to be designed at two ends of a roasting and activating rotary furnace, because the temperature difference between the inside and the outside of the furnace body is large, the fineness of materials reaches more than 1000 meshes, and the working condition is a positive pressure state, the sealing forms such as labyrinth, packing and the like are easy to lose efficacy, only mechanical sealing is suitable, and the purposes of cooling, lubricating, dust prevention and the like can be well solved by spraying hydraulic oil on the sealing surface of a moving ring and a static ring.
The inventor finds that the distributor is designed for supplementing high-alumina balls and conveying powder such as a guiding agent and clean coal, the splitter cone is designed at the outlet end of the distributor cone and mainly aims at dispersing the materials and uniformly mixing the materials with fly ash of a coal-fired boiler of a circulating fluidized bed, the uniformly mixed powder is wrapped by high-temperature smoke and is thrown to a spiral blade along the rotating tangential direction of the spiral blade under the action of centrifugal force, the powder is thrown to the inner wall of a roasting and activating rotary furnace along the rotating tangential direction of the spiral blade under the action of friction of the inner wall of the furnace body, the powder is prevented by a high-alumina ball pile layer, gravity, the spiral blade and the like to lose kinetic energy and stay at the bottom of the furnace body, the powder is mutually rubbed and ground by the.
The inventor finds that the air separator inlet is designed into three spiral inlets uniformly distributed along the circumferential direction, can avoid cyclone wind belts spirally advancing along the inner wall of the roasting activation rotary cylinder, which are short-circuited by smoke wind channels at two ends of the roasting activation rotary furnace and guide spiral blades to lift, and also has the advantages that the inlet ventilation area is large, the smoke flow rate is reduced under the condition of the same ventilation volume, the kinetic energy of carried particles is reduced, and thus the finished particles with enough fineness are sorted.
Compared with the prior art, the invention at least has the following advantages: firstly, fly ash of a coal-fired boiler of a circulating fluidized bed is the most common waste in the production process of the boiler, is greatly harmful to personnel in a workplace, is easy to cause occupational diseases such as pneumoconiosis and the like, and causes pollution to the environment by dust dissipated in the air. The invention changes waste into valuable and is used for preparing kaolin, thereby not only reducing environmental pollution, but also reducing production cost; secondly, to realize the high-value utilization of fly ash of the circulating fluidized bed coal-fired boiler for preparing kaolin, the requirements of chemical components and physical properties of the kaolin are required to be met according to GB/T14563-2008 of Kaolin and test method thereof, and although the concrete requirements of various industries on kaolin fillers are not completely consistent, the fineness of the kaolin fillers is equal to that of Al2O3/SiO2The ratio is specified clearly, so that the fly ash of the circulating fluidized bed coal-fired boiler staying at the bottom of the roasting and activating rotary furnace is ground by utilizing the continuous rolling and mutual friction of the high-alumina balls in the roasting and activating rotary furnace along with the rotation of the high-alumina balls, and the Al is added at the high temperature of 900-1280 ℃ of roasting and activating2O3、SiO2While the reconstruction of the crystal lattice is completedThe intermolecular bond energy is reduced, the space is increased, kaolin finished products with the fineness of 1000-1200 meshes can be easily obtained under the friction grinding of the high-alumina balls, meanwhile, component particles which are removed by the mutual friction grinding of the high-alumina balls are also supplemented into the kaolin finished products, and impurities which need to be separated are not generated; thirdly, the mechanical sealing scheme is adopted for sealing two ends of the roasting activation rotary furnace, so that the sealing problem under the high-temperature condition can be reliably completed, and the emission of waste gas pollutants is avoided; fourthly, the inlets of the air separator are designed into three spiral inlets which are uniformly distributed along the circumferential direction, so that the short circuit of smoke wind channels at two ends of the roasting activation rotary furnace can be avoided, cyclone wind belts which are raised by spiral blades and spirally advance along the inner wall of the roasting activation rotary cylinder body can be guided, and the ventilation area of the inlets is larger than that of the outlets, so that the smoke flow velocity is reduced under the condition of the same ventilation quantity, the kinetic energy of carried particles is reduced, and the finished product particles with enough fineness are sorted out; fifthly, the guide pipe is designed beside the outlet of the return pipe, so that the local chamber pressure of the outlet of the return pipe is reduced, the height of a material column of a vertical pipe is reduced, the purposes of material balance and separation efficiency guarantee are achieved, and the circulating fluidized bed coal-fired boiler and the roasting activation rotary furnace can be effectively combined and normally run; sixthly, the roasting and activating rotary furnace is designed between a combustion system and a heat exchange system of the circulating fluidized bed coal-fired boiler, specifically, a hot air duct of the roasting and activating rotary furnace is connected with a cyclone separator of the circulating fluidized bed coal-fired boiler, high-temperature flue gas discharged by a winnowing machine of the roasting and activating rotary furnace exchanges heat through a superheater, an economizer and an air preheater of the circulating fluidized bed coal-fired boiler in sequence, and the electric bag dust catcher is a finished product catching device of the roasting and activating rotary furnace and an environment-friendly treatment device for waste gas particles of the circulating fluidized bed coal-fired boiler.
Drawings
FIG. 1 is a schematic structural view of a circulating fluidized bed roasting activation rotary cogeneration furnace using method.
FIG. 2 is a schematic view of the A-A section structure of the method for using the rotary co-production furnace for roasting and activating the circulating fluidized bed.
FIG. 3 is a schematic diagram of a partial enlarged structure B of the method for using the rotary co-production furnace for roasting and activating the circulating fluidized bed.
FIG. 4 is a schematic structural diagram of a large sample C of the method for using the rotary co-production furnace for roasting and activating the circulating fluidized bed.
FIG. 5 is a schematic diagram of the D-direction structure of the method for using the rotary co-production furnace for roasting and activating the circulating fluidized bed.
FIG. 6 is a schematic diagram of a partial enlarged structure E of a method for using a circulating fluidized bed roasting activation rotary cogeneration furnace according to the invention.
FIG. 7 is a schematic diagram of a partial enlarged structure F of the method for using a circulating fluidized bed roasting-activating rotary cogeneration furnace of the invention.
I-roasting activation rotary furnace II-circulating fluidized bed coal-fired boiler III-electric bag dust catcher
1-distributor 2-drive gear assembly 3-carrier roller assembly
4-roasting activation rotary furnace barrel component 5-air separator 6-screw conveyor 7-ejector
8-cooling jacket 9-diffluence cone 10-positioning frame 11-spiral blade
12-transmission system 13-driving gear 14-hot air duct 15-mechanical seal assembly I
16-ring gear 17-roller way assembly 18-roasting activation rotary cylinder
19-high-alumina ball stack layer 20-mechanical seal assembly II 21-roller set 22-base
23-cyclone separator 24-hearth 25-material returning system 26-material returning device
27-guide chamber 28-vertical pipe 29-U-shaped valve 30-return pipe 31-induced draft opening
32-guide pipe 33-negative pressure chamber 34-blowing chamber 35-superheater 36-economizer
37-air preheater.
Detailed Description
The invention is further described with reference to the following detailed description of embodiments and drawings.
As shown in figure 1, figure 2, figure 3, figure 4, figure 5, figure 6 and figure 7, the method for using the rotary co-production furnace with the roasting and activation of the circulating fluidized bed is characterized in that:
firstly, coal enters a cyclone separator 23 after fluidized combustion in a hearth 24 of a circulating fluidized bed coal-fired boiler II, larger high-temperature solid particles separated by the cyclone separator 23 enter a material returning system 25, the high-temperature solid particles form a material column in a vertical pipe 28 of a material returning device 26, a U-shaped valve 29 is arranged between the vertical pipe 28 and a material returning pipe 30, an isobaric air chamber is arranged at the bottom of the U-shaped valve 29 for supplying air to ensure the fluidization of the high-temperature solid particles, the pressure difference between the material column in the vertical pipe 28 and the hearth pressure drives the high-temperature solid particles to be continuously conveyed to the hearth 24 through the material returning pipe 30 for secondary combustion, a guide pipe 32 is arranged at the outlet end of the material returning pipe 30, smoke is led out through an air inlet 31 to ensure that the guide chamber 27 is always in a negative pressure state, so that the local hearth pressure at the outlet of the material returning pipe 30 is reduced, the high-temperature solid particles falling into a negative pressure chamber 33 are supplied air by an air blowing chamber 34 for cooling And the activation rotary furnace II is used as a raw material for preparing the kaolin.
And step two, the carrier roller assembly 3 comprises a roller group 21 and a base 22, two groups of roller way assemblies 17 are embedded in the front and the back of the roasting and activating rotary cylinder 18, the positioning frame is arranged on the carrier roller assembly 3, a ring gear 16 is embedded in the roasting and activating rotary cylinder 18, the roasting and activating rotary cylinder 18 is driven to rotate around the central axis of the roasting and activating rotary cylinder 18 under the driving of the driving gear assembly 2, and the driving gear assembly 2 comprises a driving gear 13 and a transmission system 12.
Step three, the roasting activation rotary furnace cylinder component 4 comprises a mechanical seal component I15, a ring gear 16, a roasting activation rotary cylinder 18, a roller way component 17, a high-alumina ball stacking layer 19 and a mechanical seal component II 20, wherein the high-alumina ball stacking layer 19 is laid in the roasting activation rotary cylinder 18, spherical fillers with different diameters are formed on the high-alumina ball stacking layer 19 due to abrasion and continuous supplement, and high-alumina balls continuously roll and rub with each other when rotating in the roasting activation rotary cylinder 18.
And step four, conveying materials such as a guiding agent and the like into an ejector 7 by a screw conveyor 6 of the distributor 1, simultaneously conveying fly ash of the coal-fired boiler with the high-temperature flue gas carrying the circulating fluidized bed from a hot air duct 14 into the ejector 7 to be mixed with the materials such as the guiding agent and the like, guiding the fly ash to a spiral blade 11 of the distributor 1 through a diversion cone 9, throwing the fly ash to the inner wall of a roasting and activating rotary cylinder 18 along the rotation tangential direction of the spiral blade 11 under the action of centrifugal force, losing kinetic energy to stay at the bottom under the actions of friction of the inner wall of the roasting and activating rotary cylinder 18, a high-aluminum ball pile layer 19, gravity, the spiral blade 11 and the like, suspending the high-aluminum ball pile layer 19 therebetween, performing friction grinding, and completing activation and grinding into kaolin finished product particles with.
And step five, designing inlets of the air separator 5 into three spiral inlets which are uniformly distributed along the circumferential direction, so that a cyclone wind zone which is short-circuited with smoke wind channels at two ends of the roasting and activating rotary furnace cylinder assembly 4 and guides the spiral blades 11 to lift and spirally advance along the inner wall of the roasting and activating rotary cylinder 18 can be avoided, high-temperature smoke can advance along the path of the spiral cyclone wind zone lifted by the spiral blades 11 to wrap and carry the qualified fineness to enter the air separator 5, and accordingly finished particles with uniform activation degree and fineness can be sorted.
And sixthly, after the high-temperature flue gas discharged from the air separator 5 is subjected to heat exchange through a heat exchanger 35, an economizer 36 and an air preheater 37 in sequence, the temperature of the flue gas is reduced to 150-160 ℃, the flue gas carries kaolin finished product particles to enter an electric bag dust catcher III, the flue gas is separated from the kaolin finished product particles, the kaolin finished product particles are caught by the electric bag dust catcher III and are sent to the next process, and the tail gas is treated by an environment-friendly facility and then is discharged after reaching the standard.
Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (1)
1. A method for using a rotary co-production furnace for roasting and activating a circulating fluidized bed is characterized by comprising the following steps: step one, the coal enters a cyclone separator after fluidized combustion in a hearth of a circulating fluidized bed coal-fired boiler, larger high-temperature solid particles separated by the cyclone separator enter a material returning system, the high-temperature solid particles form a material column in a vertical pipe of a material returning device, a U-shaped valve is arranged between the vertical pipe and a material returning pipe, an isobaric air chamber is arranged at the bottom of the U-shaped valve to supply air so as to ensure the fluidization of the high-temperature solid particles, the pressure difference between the material column in the vertical pipe and the hearth pressure drives the high-temperature solid particles to be continuously conveyed to the hearth through the material returning pipe for secondary combustion, the outlet end of the material returning pipe is provided with a guide pipe, smoke is led out through an air inlet to ensure that the guide chamber is always in a negative pressure state, thereby reducing the chamber pressure at the outlet of the return pipe, the high-temperature coal particles falling into the negative pressure chamber are blown by the blowing chamber to be cooled and fluidized and are discharged through the air inducing port, meanwhile, the fly ash of the coal-fired boiler of the circulating fluidized bed discharged by the cyclone separator is carried by high-temperature flue gas and is sent into a roasting activation rotary furnace to be used as a raw material for preparing kaolin; the roller component comprises a roller group and a base, two groups of roller group components are embedded in the front and the back of the roasting activation rotary cylinder body, the positioning frame is arranged on the roller component, the ring gear is embedded in the roasting activation rotary cylinder body, the roasting activation rotary cylinder body is driven to rotate around the central axis of the roasting activation rotary cylinder body under the driving of the driving gear component, and the driving gear component comprises a driving gear and a transmission system; thirdly, the roasting and activating rotary furnace cylinder assembly comprises a mechanical sealing assembly I, a ring gear, a roasting and activating rotary cylinder, a roller way assembly, a high-aluminum ball stack layer and a mechanical sealing assembly II, wherein the high-aluminum ball stack layer is laid in the roasting and activating rotary cylinder, and forms spherical fillers with different diameters due to abrasion and continuous supplement, and the high-aluminum balls roll and rub with each other continuously in the roasting and activating rotary cylinder along with the rotation of the high-aluminum balls; conveying a guiding agent material into an injector by a screw conveyor of the distributor, simultaneously leading high-temperature flue gas carrying fly ash of the coal-fired boiler of the circulating fluidized bed to enter the injector from a hot air channel to be mixed with the guiding agent material, then leading the fly ash to a spiral blade of the distributor through a diversion cone, throwing the fly ash to the inner wall of the roasting and activating rotary cylinder along the rotation tangential direction of the spiral blade under the action of centrifugal force, losing kinetic energy to stay at the bottom under the actions of friction of the inner wall of the roasting and activating rotary cylinder, blocking by the gravity and the spiral blade, stopping the high-aluminum ball pile layer between the high-aluminum ball pile layer and grinding the high-aluminum ball pile layer by mutual friction, and completing activation and grinding of kaolin finished particles with enough fineness at the temperature of; fifthly, inlets of the air separator are designed into three spiral inlets which are uniformly distributed along the circumferential direction, so that a cyclone wind zone which is raised by a spiral blade and spirally advances along the inner wall of the roasting and activating rotary cylinder body component at two ends of the roasting and activating rotary furnace cylinder body component can be prevented from being in short connection, the high-temperature smoke advances along the path of the spiral cyclone wind zone raised by the spiral blade and wraps kaolin finished product particles with qualified fineness to enter the air separator, and the finished product particles with relatively uniform activation degree and fineness are sorted out; and sixthly, after the high-temperature flue gas discharged from the air separator is subjected to heat exchange through a heat exchanger, a coal economizer and an air preheater in sequence, the temperature of the flue gas is reduced to 150-160 ℃, the flue gas carries kaolin finished product particles to enter an electric bag dust catcher, the flue gas is separated from the kaolin finished product particles, the kaolin finished product particles are caught by the electric bag dust catcher and sent to the next process, and the tail gas is treated by an environment-friendly facility and then is discharged after reaching the standard.
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| CN105485671A (en) * | 2016-01-20 | 2016-04-13 | 枣庄矿业（集团）有限责任公司蒋庄煤矿 | Hood strengthening device of circulating fluidized bed |
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| CN2395146Y (en) * | 1999-09-20 | 2000-09-06 | 李爱民 | Rotary kiln-fluidised bed combined solid waste pyrolysis apparatus |
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| CN102925219A (en) * | 2012-11-07 | 2013-02-13 | 东南大学 | Device for resource utilization of circulating fluidized bed coal-gasified discharged ash and use method |
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