CN113294784A

CN113294784A - Rotary cement kiln system for disposing waste fan blades and working method thereof

Info

Publication number: CN113294784A
Application number: CN202110574130.6A
Authority: CN
Inventors: 林伟荣; 蔡安民; 许扬; 张林伟; 李媛; 金强; 李力森
Original assignee: Huaneng Clean Energy Research Institute
Current assignee: Huaneng Clean Energy Research Institute
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2021-08-24

Abstract

The invention discloses a rotary cement kiln system for disposing waste fan blades and a working method thereof, and belongs to the technical field of resource recovery. The device comprises a blade crushing and smashing system, a raw material feeding system, a flue gas treatment system, a suspension preheater, a decomposing furnace, a rotary kiln, a clinker cooling device and a blade particle pneumatic conveying system. Crushed fan blade particles enter a decomposing furnace for pyrolysis and combustion through pneumatic transmission, and a cyclone is arranged at the bottom of the decomposing furnace; the heat released by the combustion of the organic composite material and the heat released by the combustion of the pulverized coal are used for preheating and decomposing the raw materials; the glass fibers in the blade particles also participate in forming raw materials, and the raw materials enter the rotary kiln together for firing clinker. The waste fan blades are effectively and comprehensively utilized, and combustion products are treated by a smoke treatment device arranged in a rotary cement kiln system together with coal-fired smoke to realize normal emission. The invention can smoothly realize the harmless and resource treatment of the waste blades of the fan, and generates good environmental protection benefit and economic benefit.

Description

Rotary cement kiln system for disposing waste fan blades and working method thereof

Technical Field

The invention belongs to the technical field of resource recovery, and particularly relates to a rotary cement kiln system for treating waste fan blades and a working method thereof.

Background

The wind power generation industry presents a rapid development trend, the quantity of newly-added devices is continuously increased every year, on the other hand, due to the design life and other reasons, a large number of fans face elimination every year, and blade breakage caused by abnormal operation of a wind turbine generator and corner waste and defective products of blade enterprises jointly form a large number of waste/used blades (collectively called used blades) which are increasingly required to be comprehensively disposed every year. The waste leaves are effectively recycled, so that the expectation of building an environment-friendly society is met, and the harmless recycling treatment of the waste leaves is worthy of deep exploration.

From the material composition, the fan blade mainly comprises a composite material (epoxy resin and the like), a fiber reinforced material (such as glass fiber and the like), an adhesive (such as epoxy adhesive, polyurethane adhesive and the like), a coating and the like. The weight ratio of the organic composite material in the blade is high, and the rest is mainly glass fiber. The thermosetting composite material is difficult to degrade, if the thermosetting composite material is not recycled, the resource waste is caused, and great pressure is formed on the environment.

The blade material recycling comprises energy utilization and raw material utilization. The heat utilization is to burn the organic composite material to utilize the heat value thereof, and the raw material utilization refers to the participation of the composite material of the waste blade in similar resource flows, such as the chopping of the blade for the repeated use of different products and processes, or the separation of the composite material in the blade from the glass fiber and the like for the recycling of different purposes. Because the composite material of epoxy resin, adhesive and the like belongs to thermosetting plastics, pyrolysis gas/oil is generated by thermal decomposition at high temperature, namely, the pyrolysis product has flammability, and meanwhile, the waste blades contain 10 percent of glass fiber (components such as calcium oxide, aluminum oxide, silicon oxide and the like) and can be used for cement production and the like after extraction.

The blade thermosetting plastic is subjected to thermal decomposition, the decomposition product can be used as a raw material after being recovered, and the resource recycling property is more outstanding compared with the modes such as incineration and the like, but no mature technology exists at present.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a rotary cement kiln system for treating waste fan blades and a working method thereof, so that harmless and recycling treatment of the waste fan blades is realized, and the rotary cement kiln system has good environmental protection benefits and economic benefits.

The invention is realized by the following technical scheme:

the invention discloses a rotary cement kiln system for treating waste fan blades, which comprises a blade crushing and smashing system, a raw material feeding system, a flue gas treatment system, a suspension preheater, a decomposing furnace, a rotary kiln, a clinker cooling device and a blade particle pneumatic conveying system, wherein the blade crushing and smashing system is connected with the decomposing furnace;

the decomposing furnace comprises a decomposing furnace barrel, wherein a material return pipe, a plurality of tertiary air nozzles, a plurality of coal as fired nozzles and a plurality of blade particle nozzles are respectively arranged on the decomposing furnace barrel; the blade crushing and crushing system is connected with the blade particle nozzle through a blade particle pneumatic conveying system; the upper part of the decomposition furnace cylinder is connected with a flue gas pipeline, the lower part of the decomposition furnace cylinder is connected with a gradually expanding connecting flue, and a swirler is arranged in the gradually expanding connecting flue;

one end of the rotary kiln is connected with a smoke chamber, the other end of the rotary kiln is connected with a coal nozzle entering the kiln, and the smoke chamber is connected with a gradually expanding connecting flue through a rotary kiln gas flue; a clinker outlet of the rotary kiln is connected with a clinker cooling device through a clinker discharge pipe; the clinker cooling device is connected with a clinker discharge port;

the suspension preheater comprises a multi-stage cyclone, a flue gas inlet of the last stage cyclone is connected with a flue gas pipeline, a kiln raw material conveying pipe is connected with an outlet at the bottom of the last stage cyclone, and the kiln raw material conveying pipe is connected with a smoke chamber; the bottom outlet of the penultimate cyclone is connected with a material returning pipe; the air inlet pipe of the primary cyclone is communicated with the exhaust pipe of the secondary cyclone, the joint of the air inlet pipe and the exhaust pipe is provided with a raw material feeding pipe, and the raw material feeding pipe is connected with a raw material feeding system; the central cylinder of the primary cyclone cylinder is connected with a flue gas treatment system.

Preferably, the blade crushing and crushing system comprises a crusher, an iron remover and a crusher which are connected in sequence, and the crusher is connected with the blade particle pneumatic conveying system through a third discharging auger.

Preferably, the raw material feeding system comprises a material homogenizing bin, a first packing auger, a bucket elevator and a second packing auger which are connected in sequence, wherein a feeding port is formed in the material homogenizing bin, and the second packing auger is connected with the raw material feeding pipe.

Preferably, the flue gas treatment system comprises a humidifying tower, a dust remover and a chimney which are connected in sequence, a first induced draft fan is arranged on a connecting pipeline between the humidifying tower and the dust remover, and a second induced draft fan is arranged on a connecting pipeline between the dust remover and the chimney.

Preferably, a plurality of coal as fired nozzles, a plurality of blade particle nozzles and a plurality of tertiary air nozzles are sequentially arranged along the decomposing furnace cylinder from top to bottom; the plurality of coal as fired nozzles, the plurality of blade particle nozzles and the plurality of tertiary air nozzles are respectively arranged along the outer wall of the decomposition furnace cylinder in a slant direction.

Further preferably, a plurality of coal as fired nozzles, a plurality of blade particle nozzles and a plurality of tertiary air nozzles are circumferentially and uniformly distributed at the same height position of the decomposition furnace cylinder respectively, and form an included angle of 45-60 degrees with the radial direction of the decomposition furnace cylinder.

Preferably, the swirler includes a plurality of circumferentially and uniformly distributed swirl vanes, the surface of the swirl vane is provided with a fire-resistant wear-resistant layer, and the center of the swirl vane is a high-temperature-resistant base body.

Preferably, the clinker cooling device comprises a cooling chamber, the inlet end of the cooling chamber is connected with a clinker discharge pipe, the outlet end of the cooling chamber is connected with a clinker discharge port, one side of the cooling chamber is provided with a plurality of cooling fans, and the other side of the cooling chamber is respectively connected with a tertiary air pipe, a secondary air pipe, a coal grinding exhaust pipe, an exhaust gas pipe and a clinker discharge port; the tertiary air pipe is connected with the tertiary air nozzle, the secondary air pipe is connected with a secondary air port of the rotary kiln, the coal grinding air exhaust pipe is connected with a coal grinding system, and the exhaust pipe is connected with the pneumatic conveying system for the blade particles.

Further preferably, the secondary air pipe, the tertiary air pipe, the coal grinding exhaust pipe and the exhaust gas pipe are sequentially arranged from the inlet end to the outlet end of the cooling chamber respectively.

The invention discloses a working method of a rotary cement kiln system for disposing waste fan blades, which comprises the following steps:

the waste blades are processed by a blade crushing and crushing system to form blade particles, and the blade particles are conveyed to a blade particle nozzle by a blade particle pneumatic conveying system and are sprayed into a decomposing furnace; coal powder is sprayed into the decomposing furnace through a coal-as-fired nozzle, tertiary air is sprayed into the decomposing furnace through a tertiary air nozzle, and high-temperature flue gas from the rotary kiln is formed into rotational flow through a rotary kiln gas flue and is connected with a cyclone in the flue in a gradually expanding manner to promote the combustion of the coal powder; the blade particles are heated and decomposed to generate high-temperature flue gas, and the residual glass fibers are entrained by the high-temperature flue gas and enter a suspension preheater through a flue gas pipeline along with the pulverized coal, the coal ash and the raw materials from the return pipe to preheat the raw materials from a raw material feeding system; the flue gas separated by the suspension preheater is discharged into a flue gas treatment system from a central cylinder of the primary cyclone cylinder for treatment; the raw material preheated and decomposed by the suspension preheater enters the rotary kiln through a smoke chamber by a kiln raw material conveying pipe; the coal air entering the kiln is sprayed into the rotary kiln by the coal nozzle, the coal air is burnt and released in the high-temperature secondary air environment, the raw material is calcined into clinker, the clinker is discharged into a clinker cooling device through a clinker discharge pipe, and the clinker is discharged out of the system through a clinker discharge port after being cooled.

Compared with the prior art, the invention has the following beneficial technical effects:

the rotary cement kiln system for treating the waste fan blades can achieve large waste blade treatment capacity on the premise of not influencing the normal operation of the rotary cement kiln system, and is high in system regulation flexibility; the broken fan blade particles enter the decomposing furnace for pyrolysis and combustion through a pneumatic conveying method, and the cyclone arranged at the bottom of the decomposing furnace ensures that the pulverized coal and the blade particles can be fully pyrolyzed and combusted, so that most of carbonate in raw materials is decomposed, and the performance of the decomposing furnace is improved. The heat released by the combustion of the organic composite material and the heat released by the combustion of the pulverized coal are used for preheating and decomposing raw materials, and the potential heat value of the fan blade is effectively utilized. The glass fibers in the blade particles also participate in forming raw materials, and the raw materials enter the rotary kiln together for firing clinker. The waste fan blades are effectively and comprehensively utilized, and combustion products are treated by environment-friendly devices such as dust removal devices, denitration devices and the like which are equipped in a rotary cement kiln system along with coal-fired flue gas, so that normal discharge is realized. In the high-temperature combustion environment in the decomposing furnace, special pollutants (such as dioxin and the like) burnt by the organic composite material in the blades can hardly be formed, and extra flue gas treatment equipment is not required to be added. Can smoothly realize the harmless and resource treatment of the waste blades of the fan, and generate good environmental protection benefit and economic benefit.

Furthermore, the blade crushing and smashing system processes the blades into particles with smaller diameters step by step through the crusher and the smashing machine, so that full pyrolysis is facilitated; meanwhile, metal parts (such as small bolts and the like) carried in the raw materials are removed from the iron remover, so that the metal parts are prevented from flowing into the pyrolyzer and causing adverse effects on a boiler system.

Furthermore, the raw materials can be uniformly mixed in the homogenizing silo, which is beneficial to the subsequent preheating.

Furthermore, the flue gas is evaporated after being atomized in the humidifying tower, so that the water content of the flue gas can be improved, the temperature of part of the flue gas can be reduced, and the dust removal efficiency of the dust remover can be improved.

Furthermore, materials in the coal as fired nozzle, the blade particle nozzle and the tertiary air nozzle are obliquely sprayed into the decomposing furnace along the outer wall of the decomposing furnace cylinder body, so that the heat exchange strength of the particles in the decomposing furnace is improved, the retention time is prolonged, the pulverized coal combustion, the pyrolysis and combustion of the blade particles and the decomposition of most of carbonate in raw materials are facilitated, and the performance of the decomposing furnace is improved.

Furthermore, the coal as fired nozzles, the blade particle nozzles and the tertiary air nozzles are uniformly distributed in the circumferential direction and sprayed at an angle of 45-60 degrees, so that the coal as fired nozzles, the blade particle nozzles and the tertiary air nozzles are favorably and fully mixed with the rotational flow of the flue gas.

Furthermore, the center of the spinning disk adopts a high-temperature-resistant base body, and the outer surface of the spinning disk is covered with a fireproof wear-resistant layer, so that the service life of the spinning disk can be effectively prolonged, and the safety and the stability of a system are improved.

Furthermore, the gas in the clinker cooling device is respectively used as tertiary air of the decomposing furnace, secondary air of the rotary kiln, coal grinding air of the coal grinding system and gas of the blade particle pneumatic conveying system, so that energy in the system is fully utilized, and the energy consumption of the system is reduced.

Furthermore, the secondary air pipe, the tertiary air pipe, the coal grinding exhaust pipe and the exhaust gas pipe are sequentially arranged from the inlet end to the outlet end of the cooling chamber respectively and are sequentially arranged according to the temperature requirements, and the energy is fully and gradiently utilized.

The working method of the rotary cement kiln system for disposing the waste fan blades, disclosed by the invention, is flexible in process, can realize larger waste blade disposal amount on the premise of not influencing the normal operation of the rotary cement kiln system, fully utilizes resources in the disposal process, can reduce the use of coal fuel, can also consume a large amount of waste for social environment, and generates good environmental protection benefit and economic benefit.

Drawings

FIG. 1 is a schematic diagram of the overall construction of a rotary cement kiln system for disposing of waste fan blades according to the present invention;

FIG. 2 is a schematic diagram of a multi-stage suspension preheater according to the present invention;

FIG. 3 is a schematic view of the decomposing furnace of the present invention;

FIG. 4 is a view B-B of FIG. 3;

FIG. 5 is a view A-A of FIG. 3

FIG. 6 is a cross-sectional view of a spinning disk.

In the figure: 1. a material homogenizing bin; 2. a first auger; 3. a bucket elevator; 4. a second auger; 5. a suspension preheater; 6. a conveying pipe for raw materials entering the kiln; 7. a decomposing furnace; 8. a flue gas duct; 9. a material returning pipe; 10. feeding into a coal pipe of a decomposing furnace; 11. feeding the mixture into a decomposition furnace air pipe; 12. a tertiary air pipe; 13. a rotary kiln gas flue; 14. a smoking chamber; 15. a rotary kiln; 16. a clinker discharge pipe; 17. a clinker cooling device; 18. a secondary air duct; 19. a kiln coal inlet duct; 20. a coal pipe entering the kiln; 21. a coal grinding air pumping pipe; 22. an exhaust gas pipe; 23. a cooling fan; 24. a clinker discharge port; 25. a humidifying tower; 26. a first induced draft fan; 27. a dust remover; 28. a second induced draft fan; 29. a chimney; 30. a C1 class cyclone; 31. a C2 class cyclone; 32. a C3 class cyclone; 33. a C4 class cyclone; 34. a C5 class cyclone; 35. a first shut-off valve; 36. a tertiary air nozzle; 37. a coal as fired nozzle; 38. a swirler; 39. a kiln coal injection nozzle; 40. a spinning disk; 41. a decomposing furnace cylinder; 42. a high temperature resistant matrix; 43. a refractory wear layer; 44. a vane particle nozzle; 45. a leaf particle conveying pipe; 46. a crusher; 47. a de-ironing separator; 49. a pulverizer; 50. a third discharging flood dragon; 51. a blower; 52. a second stop valve; 53. a third induced draft fan; 54. a third stop valve; 55. a fourth stop valve; 56. an air inlet pipe; 57. an exhaust pipe; 58. a discharge pipe; 59. a central barrel; 60. the flue is connected in a gradually expanding way.

Detailed Description

The invention will now be described in further detail with reference to the following drawings and specific examples, which are intended to be illustrative and not limiting:

referring to fig. 1, in the rotary cement kiln system for disposing waste fan blades of the present invention, raw materials such as clay and limestone are crushed and then conveyed into a homogenizing silo 1 in a certain proportion for homogenizing and mixing treatment to form raw materials. The bottom of the equalizing bin 1 is provided with a discharge hole, the equalizing bin is conveyed to a bucket elevator 3 through a first auger 2, the equalizing bin is lifted to a suspension preheater 5 by the bucket elevator 3 at a certain height, and raw materials are conveyed and conveyed into the suspension preheater 5 by a second auger 4 after the bucket elevator 3 discharges the materials.

As shown in fig. 2, in an embodiment of the present invention, the suspension preheater 5 is composed of a C1-grade cyclone 30, a C2-grade cyclone 31, a C3-grade cyclone 32, a C4-grade cyclone 33 and a C5-grade cyclone 34, each grade of cyclone is designed as a cyclone structure with an offset central cylinder, and the cyclones are connected in series, as shown in the figure, an air inlet pipe 56 of the C1-grade cyclone 30 is connected to an air outlet pipe 57 of the C2-grade cyclone 31, and a discharge pipe 58 of the C1-grade cyclone 30 is connected to an air inlet pipe 56 of the C2-grade cyclone 31; raw materials are conveyed to a proper position between an air inlet pipe 56 of the C1-level cyclone cylinder 30 and an air outlet pipe 57 of the C2-level cyclone cylinder 31 by the second packing auger 4, a raw material inlet pipe is connected, and a first stop valve 35 is arranged on the raw material inlet pipe; the separated raw material of the C4 grade cyclone cylinder 33 enters the decomposing furnace 7 through the return pipe 9, and the separated raw material of the C5 grade cyclone cylinder 34 is sent into the rotary kiln 15 through the kiln raw material conveying pipe 6 for burning.

The suspension preheater 5 preheats the raw materials by using high-temperature flue gas (1050-1300 ℃) formed by burning coal powder in the decomposing furnace 7, the flue gas is guided to flow through each cyclone cylinder by the gas guide pipe and the gas guide flue from bottom to top, the temperature of the flue gas is gradually reduced, and the temperature of the flue gas at the outlet of the C1-level cyclone cylinder 30 is 250 ℃. After entering the suspension preheater 5, raw materials are firstly contacted with lower-temperature flue gas and exchange heat, the particle size of raw materials is small, the specific surface area is large, heat exchange can be fully carried out under the high-speed airflow environment, the gravity of large particles is greater than the air drag force, the large particles directly fall into the next-stage cyclone cylinder (C2-stage cyclone cylinder 31) through the exhaust pipe 57, small particles are carried by the flue gas to enter the previous-stage cyclone cylinder (C1-stage cyclone cylinder 30), and the small particles enter the next-stage cyclone cylinder (C3-stage cyclone separator 32) through the discharge pipe after high-efficiency gas-solid separation of the cyclone cylinder, so that the raw materials are heated by the higher-temperature flue gas. The raw meal particles are heated and the processes of clay dehydration and partial decomposition of carbonate occur in the suspension preheater 5. The above steps are repeated, the temperature of the raw materials entering the kiln, which are separated by the C5 stage cyclone 34 at the tail end of the suspension preheater 5, is 1020 ℃, the dehydration and the carbonate decomposition are fully completed, the main components of the raw materials are silicon dioxide, aluminum oxide, calcium oxide and oxides of Mg and Fe, and the raw materials can be used for firing clinker.

The high-temperature heating flue gas of the suspension preheater 5 comes from the decomposing furnace 7, a coal-as-fired nozzle 37 and a tertiary air nozzle 36 are respectively connected to the decomposing furnace 7, a rotary kiln gas flue 13 is connected to the bottom, and the high-temperature flue gas (minus 1020 ℃) generated by burning clinker and coal powder in the rotary kiln 15 enters the decomposing furnace 7 through a smoke chamber 14 at the kiln tail of the rotary kiln 15 and the rotary kiln gas flue 13. The injected coal as fired is heated and combusted to release heat in an aerobic environment, the temperature is further raised, and the raw meal conveyed to the decomposing furnace 7 through the return pipe 9 of the C4-level cyclone 33 completes most of carbonate (CaCO) in a high-temperature environment₃Etc.) and is carried by high-temperature flue gas to enter a suspension preheater 5 through a flue gas pipeline 8 at the front end of a C5-level cyclone 34, and finally raw materials which are dehydrated and decomposed by carbonate enter a rotary kiln 15 through a kiln raw material conveying pipe 6.

A rotary kiln 15 for firing clinker arranged obliquely at an angle, the kiln tail position passing through the smoke chamber 14 for receiving raw material entering the kiln and discharging smoke; the kiln head is provided with a kiln coal/air conveying system and a clinker discharge pipe 16. The coal entering the kiln and the coal entering the kiln are conveyed through the coal entering pipe 20 and the coal entering air pipe 19, coal particles carried by the coal entering the kiln are sprayed into the rotary kiln 15 under the action of the coal entering nozzle 39, meanwhile, air used for cooling clinker in the clinker cooling device 17 is extracted at a high-temperature section and is sent into the rotary kiln 15 to be used as secondary air, and the temperature of the secondary air is as high as 1100 ℃. The temperatures of the coal entering the kiln and the air of the coal entering the kiln are not more than 70 ℃, the air volume of the coal entering the kiln is small, the coal powder is mainly conveyed, the dilution and cooling degree of the coal powder to a high-temperature airflow environment is negligible, namely, the coal entering the kiln can be rapidly heated, ignited and released heat under the high-temperature secondary air environment, and a high-temperature environment of more than 1500 ℃ is formed in the whole rotary kiln 15 area, so that the physical and chemical reactions in the cement clinker forming process are facilitated, such as kaolin dehydration, calcium carbonate decomposition, magnesium carbonate decomposition, and the formation of important substances such as C2S, C3A, C4AF, C3S and the like.

The clinker discharged from the clinker discharge pipe 16 has a temperature higher than 1400 ℃, enters the clinker cooling device 17 for cooling, and cooling fans 23 with different numbers are arranged on the side part of the clinker cooling device 17 to provide large-flow air for convective heat exchange with the clinker. The cooled clinker temperature can be reduced to about 230 ℃, and the clinker is discharged from a clinker discharge pipe 24 and made into a cement finished product by a downstream cement preparation device.

And the side part of the clinker cooling device 17 is sequentially provided with an air extraction opening, and cooling air with different temperature ranges is extracted and utilized. And a secondary air pipe 18, a tertiary air pipe 12, a coal grinding exhaust pipe 21 and an exhaust gas pipe 22 are sequentially arranged along the clinker inlet to the clinker outlet of the clinker cooling device 17. The temperature of the secondary air is 1100 ℃, the temperature of the tertiary air is 930 ℃, the temperature of the coal grinding air is 340 ℃, and the temperature of the waste gas is 240 ℃, so that the method can be used for meeting the utilization requirements of the whole rotary cement kiln system.

The waste gas of the rotary cement kiln system is led out from the central cylinder 59 of the C1-grade cyclone cylinder 30 in the suspension preheater 5 through the main exhaust pipe, the smoke temperature at the outlet of the main exhaust pipe is about 350 ℃, the smoke is pumped to the humidifying tower 25 under the action of the first induced draft fan 26, water is sprayed, atomized and evaporated, the water content of the smoke is improved, the partial smoke temperature is reduced, and the dust removal efficiency is improved. The humidified flue gas enters a downstream dust remover 27 for efficient dust removal and is introduced into a chimney 29 by a second induced draft fan 28 for emission.

The working process of the invention is as follows:

the waste blades are divided into sections 2-3 meters long in length in a wind power plant/blade enterprise and then are intensively transported to the site of a cement plant for temporary storage. When the rotary cement kiln system operates, the sectional blades are sent into the crusher 46, the blades are primarily crushed into massive raw materials with the length of 2-3 cm through a mechanical structure formed by mutually meshing and cutting in the crusher 46, the massive raw materials are discharged from an outlet of the crusher 46 after being crushed and directly fall into the downstream iron remover 47, an electromagnetic adsorption system is arranged in the iron remover 47, metal pieces (such as small bolts and the like) carried in the raw materials can be adsorbed, and the situation that metal devices flow into the downstream system to influence the normal operation of the system is avoided. A pulverizer 49 is connected below the outlet of the iron remover 47, and the pulverizer 49 can further pulverize the lump material into vane particles having an average particle size of-2 mm. The particles are discharged from the crusher 49 by a third discharge auger 50.

The crushed lamina particles are transported to the decomposing furnace 7 by a lamina particle pneumatic conveying system. The air flow of pneumatic transmission has two sources, one is from the waste gas that the clinker cooling device 17 discharges, the temperature is about 240 ℃, draw by the third draught fan 53, set up a tee pipe in the third draught fan 53 low reaches, adjust the air flow through controlling the aperture of the third stop valve 54, the surplus waste gas is discharged by the control of the fourth stop valve 54. The blower 51 provides air at normal temperature (25 ℃), the temperature of blade particle conveying airflow is controlled to be 70-80 ℃ through flow regulation, the flow speed in the blade particle conveying pipe 45 with the diameter of 300mm is 20-25 m/s, blade particles discharged by the third discharging auger 50 are conveyed for a long distance and are sprayed into the decomposing furnace 7 through the blade particle nozzle 44, and the blade particle conveying pipe 45 is provided with the second stop valve 52.

The invention designs a decomposing furnace 7 for disposing and utilizing blade particles, as shown in figure 3, the main part of the decomposing furnace is a circular decomposing furnace cylinder body 41, and the bottom of the decomposing furnace cylinder body is connected with a rotary kiln gas flue 13. The high temperature flue gas (1020 ℃) formed in the rotary kiln 15 enters the decomposing furnace 7 through the rotary kiln gas flue 13 and the gradually expanding connecting flue 60. The cyclones 38 are arranged in the divergent connecting flue 60, and the cyclones 38 are formed by uniformly distributing 4-6 cyclone sheets 40 twisted into a certain shape, as shown in fig. 5. The flue gas will form a rotary upward flow in the decomposition furnace cylinder 41 by the guiding action of the cyclone sheet 40. As the introduced rotary kiln gas has higher temperature (1020 ℃) and high particle concentration, the upper surface and the lower surface of the cyclone sheet 40 are covered with a refractory wear-resistant layer 43 with the thickness of 20-25 cm, the center is a high-temperature resistant matrix 42, and the high-temperature resistant matrix 42 can be made of high-temperature resistant stainless steel such as 310S stainless steel, as shown in figure 6, the service life of the equipment is prolonged under the condition of not influencing flow field guiding.

The decomposing furnace cylinder 41 is sequentially provided with a tertiary air nozzle 36, a blade particle nozzle 44 and a coal as fired nozzle 37 from bottom to top. The coal as fired nozzle 37 is respectively connected with the coal as fired pipe 10 and the air pipe 11 of the decomposing furnace. As shown in fig. 4, the nozzles are uniformly distributed along the decomposing furnace cylinder 41, and the nozzles should be arranged at a certain angle (45-60 °) to the radial direction, so that the pulverized coal or the air flow is obliquely sprayed into the decomposing furnace 7, is fully fused with the rotary kiln gas flowing in a rotating manner, and flows upwards along the decomposing furnace cylinder 41 in a rotating manner. The number and the arrangement height of the tertiary air nozzles 36, the blade particle nozzles 44 and the coal as fired nozzles 37 need to be combined with the specific design of the decomposition furnace cylinder 41, so that the coal powder can stay for 2-3 seconds and complete the full combustion.

The rotational flow high temperature aerobic environment in the decomposing furnace 7 enables the sprayed coal powder to be heated rapidly and complete combustion. After the blade particles are sprayed through the blade particle nozzle 44, the particles are rapidly heated, the organic composite material contained in the particles is heated and decomposed, and the cracking products are ignited, so that the blade particles are ignited like coal powder until the blade particles are burnt out. Namely, the organic composite material in the blade particles forms flue gas and releases heat, and the glass fiber is entrained by the flue gas along with the pulverized coal, the coal ash and the decomposed raw material from the return pipe 9 and enters the suspension preheater 5 through the flue gas pipeline 8. I.e. the glass fibres in the particles of the blades also participate in the formation of kiln raw meal which is fed by the kiln raw meal conveyor 6 to the rotary kiln 15 for firing the clinker.

It should be noted that the above description is only a part of the embodiments of the present invention, and equivalent changes made to the system described in the present invention are included in the protection scope of the present invention. Persons skilled in the art to which this invention pertains may substitute similar alternatives for the specific embodiments described, all without departing from the scope of the invention as defined by the claims.

Claims

1. A cement rotary kiln system for disposing waste fan blades is characterized by comprising a blade crushing and smashing system, a raw material feeding system, a flue gas treatment system, a suspension preheater (5), a decomposing furnace (7), a rotary kiln (15), a clinker cooling device (17) and a blade particle pneumatic conveying system;

the decomposing furnace (7) comprises a decomposing furnace cylinder body (41), and a material return pipe (9), a plurality of tertiary air nozzles (36), a plurality of coal as fired nozzles (37) and a plurality of blade particle nozzles (44) are respectively arranged on the decomposing furnace cylinder body (41); the blade crushing and crushing system is connected with a blade particle nozzle (44) through a blade particle pneumatic conveying system; the upper part of the decomposition furnace cylinder body (41) is connected with a flue gas pipeline (8), the lower part of the decomposition furnace cylinder body is connected with a gradually expanding connecting flue (60), and a swirler (38) is arranged in the gradually expanding connecting flue (60);

one end of the rotary kiln (15) is connected with a smoke chamber (14), the other end is connected with a coal-entering nozzle (39), and the smoke chamber (14) is connected with a gradually-expanding connecting flue (60) through a rotary kiln gas flue (13); a clinker outlet of the rotary kiln (15) is connected with a clinker cooling device (17) through a clinker discharge pipe (16); the clinker cooling device (17) is connected with a clinker discharge port (24);

the suspension preheater (5) comprises a multi-stage cyclone, the flue gas inlet of the last stage cyclone is connected with a flue gas pipeline (8), the bottom outlet of the last stage cyclone is connected with a kiln raw material conveying pipe (6), and the kiln raw material conveying pipe (6) is connected with a smoke chamber (14); the bottom outlet of the penultimate cyclone cylinder is connected with a material return pipe (9); the air inlet pipe (56) of the primary cyclone is communicated with the exhaust pipe (57) of the secondary cyclone, a raw material feeding pipe is arranged at the joint of the air inlet pipe (56) and the exhaust pipe (57), and the raw material feeding pipe is connected with a raw material feeding system; the central cylinder (59) of the primary cyclone cylinder is connected with the flue gas treatment system.

2. The rotary cement kiln system for disposing the waste fan blade as claimed in claim 1, wherein the blade crushing and pulverizing system comprises a crusher (46), an iron remover (47) and a pulverizer (49) which are connected in sequence, and the pulverizer (49) is connected with the blade particle pneumatic conveying system through a third discharging auger (50).

3. The rotary cement kiln system for disposing the waste fan blades as claimed in claim 1, wherein the raw material feeding system comprises a material homogenizing bin (1), a first packing auger (2), a bucket elevator (3) and a second packing auger (4) which are connected in sequence, a feeding port is arranged on the material homogenizing bin (1), and the second packing auger (4) is connected with a raw material feeding pipe.

4. The rotary cement kiln system for disposing the waste fan blades as claimed in claim 1, wherein the flue gas treatment system comprises a humidifying tower (25), a dust remover (27) and a chimney (29) which are connected in sequence, a first induced draft fan (26) is arranged on a connecting pipeline between the humidifying tower (25) and the dust remover (27), and a second induced draft fan (28) is arranged on a connecting pipeline between the dust remover (27) and the chimney (29).

5. The rotary cement kiln system for disposing waste fan blades as claimed in claim 1, wherein a plurality of coal-as-fired nozzles (37), a plurality of blade particle nozzles (44) and a plurality of tertiary air nozzles (36) are arranged in sequence from top to bottom along the decomposing furnace cylinder (41); the plurality of coal as fired nozzles (37), the plurality of blade particle nozzles (44) and the plurality of tertiary air nozzles (36) are respectively arranged along the outer wall of the decomposition furnace cylinder body (41) in a beveling way.

6. The rotary cement kiln system for disposing the waste fan blades as claimed in claim 5, wherein the plurality of coal as fired nozzles (37), the plurality of blade particle nozzles (44) and the plurality of tertiary air nozzles (36) are respectively and annularly and uniformly distributed at the same height position of the decomposition furnace cylinder (41), and the included angle between the nozzles and the radial direction of the decomposition furnace cylinder (41) is 45-60 degrees.

7. The rotary cement kiln system for disposing waste fan blades as claimed in claim 1, wherein the cyclone (38) comprises a plurality of circumferentially and uniformly distributed cyclone plates (40), the surface of the cyclone plate (40) is provided with a refractory and wear-resistant layer (43), and the center is provided with a high-temperature resistant base body (42).

8. The rotary cement kiln system for disposing the waste fan blades as claimed in claim 1, wherein the clinker cooling device (17) comprises a cooling chamber, the inlet end of the cooling chamber is connected with a clinker discharge pipe (16), the outlet end of the cooling chamber is connected with a clinker discharge port (24), one side of the cooling chamber is provided with a plurality of cooling fans (23), and the other side of the cooling chamber is respectively connected with a tertiary air pipe (12), a secondary air pipe (18), a coal grinding exhaust pipe (21), an exhaust pipe (22) and the clinker discharge port (24); the tertiary air pipe (12) is connected with a tertiary air nozzle (36), the secondary air pipe (18) is connected with a secondary air port of the rotary kiln (15), the coal grinding air extraction pipe (21) is connected with a coal grinding system, and the exhaust gas pipe (22) is connected with a blade particle pneumatic conveying system.

9. The rotary cement kiln system for disposing waste fan blades as claimed in claim 8, wherein the secondary air duct (18), the tertiary air duct (12), the coal grinding air exhaust duct (21) and the exhaust air duct (22) are sequentially arranged along the inlet end to the outlet end of the cooling chamber, respectively.

10. The method for operating a rotary cement kiln system for disposing waste fan blades according to any one of claims 1 to 9, comprising:

the waste blades are processed by a blade crushing and crushing system to become blade particles, and the blade particles are conveyed to a blade particle nozzle (44) by a blade particle pneumatic conveying system and sprayed into a decomposing furnace (7); coal powder is sprayed into the decomposing furnace (7) through a coal-as-fired nozzle (37), tertiary air is sprayed into the decomposing furnace (7) through a tertiary air nozzle (36), high-temperature flue gas from the rotary kiln (15) becomes rotational flow through a rotary kiln gas flue (13) under the action of a swirler (38) in a gradually-expanded connecting flue (60) to promote the combustion of the coal powder; the blade particles are heated and decomposed to generate high-temperature flue gas, and the residual glass fibers are entrained by the high-temperature flue gas and enter a suspension preheater (5) through a flue gas pipeline (8) to preheat raw materials from a raw material feeding system along with pulverized coal, coal ash and raw materials from a return pipe (9); the flue gas separated by the suspension preheater (5) is discharged into a flue gas treatment system for treatment through a central cylinder (59) of the primary cyclone cylinder; the raw materials preheated and decomposed by the suspension preheater (5) enter the rotary kiln (15) through a smoke chamber (14) from a kiln raw material conveying pipe (6); coal particles carried by coal air entering the kiln are sprayed into the rotary kiln (15) through a coal inlet nozzle (39), combustion is carried out under the environment of high-temperature secondary air to release heat, raw materials are calcined into clinker, the clinker is discharged into a clinker cooling device (17) through a clinker discharge pipe (16), and the clinker is discharged out of the system through a clinker discharge port (24) after being cooled.