CN113217936A

CN113217936A - System for treating waste fan blade in decomposing furnace and working method thereof

Info

Publication number: CN113217936A
Application number: CN202110574097.7A
Authority: CN
Inventors: 林伟荣; 蔡安民; 李力森; 蔺雪峰; 张林伟
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: 2021-08-06

Abstract

The invention discloses a system for treating waste fan blades in a decomposing furnace and a working method thereof, belonging 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 fan coal mill. The broken waste fan blade particles are merged into a pneumatic conveying pipeline at the downstream of the fan coal mill and are conveyed into the decomposing furnace for pyrolysis and combustion, heat released by combustion of the organic composite materials of the waste blade particles and heat released by combustion of pulverized coal provide energy for dehydration and decomposition of raw materials, and the potential heat value of the fan blade is effectively utilized. The glass fiber in the blade particles, the burning coal dust and the ash slag formed by the burning of the coal dust are mixed into the raw material and enter a downstream suspension preheater, and are finally separated and returned to the rotary kiln to participate in the firing of the clinker. The invention realizes the harmless and resource treatment of the waste fan blades and has good environmental protection benefit and economic benefit.

Description

System for treating waste fan blade in decomposing furnace and working method thereof

Technical Field

The invention belongs to the technical field of resource recovery, and particularly relates to a system for treating a waste fan blade in a decomposing furnace 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.

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.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention aims to provide a system for treating waste fan blades in a decomposing furnace and a working method thereof, which effectively utilize the potential heat value of the fan blades, realize the harmless and recycling treatment of the waste fan blades and have good environmental protection benefits and economic benefits.

The invention is realized by the following technical scheme:

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

one end of the rotary kiln is connected with a smoke chamber, the other end of the rotary kiln is provided with a kiln head end plate, a kiln coal inlet nozzle is arranged on the kiln head end plate, and the kiln coal inlet nozzle is connected with a kiln coal inlet air pipe and a kiln coal inlet pipe;

the decomposing furnace comprises a decomposing furnace barrel, and a material returning pipe, a plurality of tertiary air nozzles and a plurality of coal as fired nozzles are respectively arranged on the decomposing furnace barrel; 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, a swirler is arranged in the gradually expanding connecting flue and comprises a plurality of circumferentially and uniformly distributed swirl plates; the plurality of coal as fired nozzles are connected with the fan coal mill through a coal as fired conveying pipe, and a third induced draft fan is arranged on the coal as fired conveying pipe; the fan coal mill is connected with an air inlet pipe and is connected with the clinker cooling device through a coal milling exhaust pipe, and a second air feeder is arranged on the air inlet pipe;

the blade crushing and smashing system is connected with a coal as fired conveying pipe; the coal-entering air draft branch pipe is connected to the coal-grinding air draft pipe and is connected to a coal-grinding system of the rotary kiln; a fifth stop valve is arranged on the coal entering air draft branch pipe, and a fourth stop valve is arranged on the coal grinding air draft pipe behind the coal entering air draft branch pipe; the smoke chamber is connected with the gradually-expanded 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 flue gas entry and the flue gas pipeline of suspension preheater are connected, go into kiln raw material exit linkage and go into kiln raw material conveyer pipe, go into kiln raw material conveyer pipe and be connected with the smoke chamber, and the returning charge export is connected with the returning charge pipe, and the raw material inlet pipe is connected with raw material feed system, and the exhanst gas outlet is connected with flue gas processing system.

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 first blowers, 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, and the coal grinding pumping pipe is connected with the fan coal mill.

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.

Preferably, 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 the 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 raw material feeding pipe is arranged at the joint of the air inlet pipe and the exhaust pipe, and the raw material feeding pipe is connected with the 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 smashing system comprises a crusher, an iron remover, a belt conveyor and a smashing machine which are connected in sequence, and the smashing machine is connected with the kiln coal feeding pipe 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 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 and the plurality of tertiary air nozzles are respectively arranged along the outer wall of the decomposing furnace cylinder in a beveling way.

Further preferably, the plurality of coal as fired nozzles and the 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.

The invention discloses a working method of the system for treating the waste fan blade in the decomposing furnace, which comprises the following steps:

raw coal is processed into coal powder with proper particle size by a fan coal mill and enters a coal-as-fired conveying pipe, waste blades are processed by a blade crushing and crushing system to form blade particles, the blade particles and the coal powder are immersed into the coal-as-fired conveying pipe, tertiary air is sprayed into a decomposing furnace by a tertiary air nozzle, high-temperature flue gas from a rotary kiln is turned into rotational flow by a rotary kiln gas flue through the action of a swirler in a gradually-expanded connecting flue to promote combustion of the coal powder, and the generated high-temperature flue gas wraps the coal powder, the coal ash and raw materials from a return pipe and enters a suspension preheater through a flue gas pipeline 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 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; after the flow of a part of hot gas from the coal grinding exhaust pipe is regulated by a fourth stop valve, the hot gas is mixed with normal-temperature air provided by a second air feeder and enters a coal as fired conveying pipe, and fully mixed blade particles and coal powder are sprayed into the decomposing furnace through a coal as fired nozzle under the action of a third induced draft fan; after the flow of the other part of hot gas from the coal grinding exhaust pipe is regulated by a fifth stop valve, the hot gas is conveyed to a coal grinding system of the rotary kiln through a coal inlet exhaust branch pipe; the blade particles entering the decomposing furnace are rapidly heated, the organic composite materials contained in the blade particles are heated and decomposed, the cracking products are ignited to form smoke and release heat, and the coal particles are combusted and release heat in a high-temperature secondary air environment; the residual glass fiber, the burning coal powder and the ash slag formed by the coal powder burning fall into the raw material, are mixed into the raw material to enter a downstream suspension preheater, are finally separated and are returned to the rotary kiln through a smoke chamber by a kiln raw material conveying pipe, are burnt into clinker and are discharged into a clinker cooling device through a clinker discharging pipe, and are discharged out of the system through a clinker discharging port after being cooled.

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

the invention discloses a system for disposing waste fan blades in a decomposing furnace, which is characterized in that crushed waste fan blade particles are merged into a pneumatic conveying pipeline at the downstream of a fan coal mill and are conveyed into the decomposing furnace for pyrolysis and combustion, heat released by combustion of organic composite materials of the waste fan blade particles and heat released by combustion of pulverized coal provide energy for dehydration and decomposition of raw materials, and the potential heat value of the fan blades is effectively utilized. The glass fiber in the blade particles, the burning coal dust and the ash slag formed by the burning of the coal dust are mixed into the raw material and enter a downstream suspension preheater, and are finally separated and returned to the rotary kiln to participate in the firing of the clinker. The cyclone arranged at the bottom of the decomposing furnace ensures that the pulverized coal and the return materials can be fully pyrolyzed and combusted; on one hand, the fan coal mill can efficiently realize the sufficient crushing of raw coal, so that the formed coal powder can be sufficiently mixed in a coal inlet pipe of the kiln; meanwhile, the fan coal mill can provide certain pressure, and the power consumption of pneumatic transmission is reduced. In addition, the hot air of the coal grinding exhaust pipe and the normal-temperature air provided by the second air feeder are mixed and then enter the fan coal mill, so that the crushing and drying of the raw coal entering the kiln in the fan coal mill are facilitated, the waste heat of the high-temperature clinker is fully utilized, the thermal efficiency of the system is improved, and the energy consumption of the system is reduced. The hot air extracted by the coal grinding exhaust pipe can be used as a heating heat source of coal required by the decomposing furnace and the rotary kiln, and the hot air quantity for heating the coal entering the kiln and the coal entering the furnace is respectively adjusted through the opening control of the fifth stop valve and the fourth stop valve. The blade composite material is pyrolyzed and combusted in the rotary kiln environment with the temperature exceeding 1300 ℃, the generation amount of special smoke pollutants (such as dioxin and the like) is very little, and the smoke can be discharged up to the standard without adding extra smoke treatment equipment. The system can realize larger processing amount of the waste blades on the premise of not influencing the normal operation of the cement kiln system, and has high flexibility in adjustment; 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 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.

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. The belt conveyor can lift the primarily crushed blade particles to a proper height, so that the subsequent treatment of the blade particles is facilitated and the blade particles are connected into a kiln gas power conveying 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 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 particles in the decomposing furnace is improved, the retention time is prolonged, the pulverized coal combustion, the pyrolysis and combustion of 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 and the tertiary air nozzles are uniformly distributed in the annular direction and sprayed at an angle of 45-60 degrees, so that the coal as fired nozzles and the tertiary air nozzles are favorably and fully mixed with the rotational flow of the flue gas.

The working method of the system for treating the waste fan blade in the decomposing furnace disclosed by the invention has the advantages that the process is flexible, the blade treatment capacity is far smaller than the coal amount entering the kiln, the larger treatment capacity of the waste blade can be realized on the premise of not influencing the normal operation of a cement kiln system, the resources are fully utilized in the treatment process, the use of coal fuel can be reduced, a large amount of waste can be consumed for social environment, and good environmental protection benefit and economic benefit are generated.

Drawings

FIG. 1 is a schematic view of the overall configuration of the system for disposing of waste fan blades in a decomposition furnace 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.

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. a kiln coal inlet duct; 11. a coal as fired delivery 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 second stop valve; 20. a coal pipe entering the kiln; 21. a coal grinding air pumping pipe; 22. an exhaust gas pipe; 23. a first blower; 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; 44. a kiln head end plate; 45. a coal bunker; 46. a crusher; 47. a de-ironing separator; 48. a belt conveyor; 49. a pulverizer; 50. a third discharging auger; 51. a second blower; 52. a fan coal mill; 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 connecting flue is gradually expanded; 61. a fourth discharging auger; 64. and a fifth stop valve.

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, the system for disposing the waste fan blade in the decomposing furnace of the present invention relies on a dry cement rotary production process, and raw materials such as clay and limestone are crushed and then are 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. By controlling the speed of the second packing auger 4 and the opening degree of the first stop valve 35, the raw material entering amount can be effectively controlled, and the smoke is prevented from being reversely mixed.

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 coal powder injected through the coal as fired nozzle 37 is heated and combusted to release heat in an aerobic environment, and the temperature of the upper middle area of the decomposing furnace (7) is greatly improved. The raw meal delivered to the decomposing furnace 7 through the return pipe 9 of the C4 grade cyclone 33 will complete most of carbonate (CaCO) in 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 inlet nozzle 39 and a clinker discharge pipe 16. The kiln coal inlet nozzle 39 is connected with a kiln coal inlet air pipe 10 and a kiln coal inlet pipe 20, pulverized coal is crushed, transported and falls into the kiln coal inlet pipe 20, and enters the rotary kiln 15 through the kiln coal inlet nozzle 39 under the action of coal conveying air provided by the kiln coal inlet air pipe 10. At the same time, the air used to cool the clinker in the clinker cooling device 17 is extracted at the high temperature stage and returned to the rotary kiln 15 to participate in combustion as secondary air, the temperature of which is up to 1100 ℃. The temperature of the coal powder entering the kiln can reach 150-250 ℃, namely the coal powder entering the kiln can be rapidly heated, ignited and released heat under the high-temperature secondary air environment, and a high-temperature environment exceeding 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, formation of important substances such as C2S, C3A, C4AF and C3S.

The temperature of the clinker discharged from the clinker discharge pipe 16 exceeds 1400 ℃, the clinker enters the clinker cooling device 17 for cooling, and the first air blowers 23 with different numbers are arranged on the side part of the clinker cooling device 17 to provide large-flow air for carrying out heat convection 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.

In order to effectively improve the performance of the suspension preheater 5 and the decomposing furnace 7 of the rotary cement kiln system, the decomposing furnace 7 is specially designed, 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 gradually-expanding connecting flue 60, and the cyclones 38 are formed by uniformly distributing 4-6 cyclone sheets 40 twisted into a certain shape. 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 refractory and wear-resistant materials with the thickness of 20-25 cm, and the center of the cyclone sheet is made of high-temperature resistant stainless steel, such as 310S stainless steel, so that the service life of the equipment is prolonged under the condition that the formation of a rotational flow field is not influenced.

The decomposing furnace cylinder 41 is sequentially provided with a tertiary air nozzle 36 and a coal as fired nozzle 37 from bottom to top. The coal as fired nozzle 37 is directly connected with the coal as fired conveying pipe 11, namely, the coal powder is carried and smoothly sent into the decomposing furnace 7 by utilizing high-speed air in the coal as fired conveying pipe 11. The nozzles are uniformly distributed along the circumferential direction of the decomposing furnace cylinder 41, and the nozzles are arranged at a certain angle (45-60 degrees) with the radial direction, so that the pulverized coal or the airflow 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 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 coal required for the decomposing furnace 7 is crushed by using a fan coal mill 52. The hot gas required by the fan coal mill 52 mainly comes from the coal-grinding exhaust pipe 21 of the clinker cooling device 17, and the outlet temperature of the hot gas is about 340 ℃. The hot air extracted by the coal grinding exhaust pipe 21 has larger air volume and can be used as a heating source of the fire coal required by the decomposing furnace 7 and the rotary kiln 15. The hot air volume for heating the coal in the kiln and the coal in the furnace can be respectively adjusted by controlling the opening degree of the fifth stop valve 64 and the fourth stop valve 55. (the coal grinding system after the fifth shut-off valve 64 is a conventional system and is not shown in FIG. 1). The fourth stop valve 55 controls the amount of hot air for pyrolyzing the coal as fired, the hot air needs to be mixed with the normal temperature air (25 ℃) provided by the second blower 51, and the flow and the temperature of the mixed gas meet the operation requirement of the fan coal mill 52 through the opening control of the third stop valve 54 and the fourth stop valve 55, wherein the temperature of the mixed gas can be controlled to be 150-200 ℃. The fan coal mill 52 is mainly composed of main components such as a flue gas and raw coal inlet on the side part, an overfire air crushing and separating device, a striking wheel, a driving motor and the like. The mixed air is fed from the side flue, and a temporary storage and conveying device for coal entering the kiln is arranged above the flue. Raw coal is temporarily stored in the coal bunker 45, is conveyed by the fourth discharging auger 61 and falls into the flue, is brought into the over-wind crushing and separating device by the mixed gas, and the motor drives the beating wheel to realize preliminary crushing through rapid collision between blades of the beating wheel and coal particles. The mixed air carries the pulverized coal particles to flow to the downstream, under the action of a separator at the rear end of the striking wheel, the large-particle pulverized coal is separated and falls into the striking wheel to be crushed again, and the process is repeated, and finally the mixed hot air carries the pulverized coal with the particle size meeting the combustion requirement to enter the coal as fired conveying pipe 11. The diameter of the coal as fired conveying pipe 11 is about 300mm, the internal airflow temperature is 150-200 ℃, the airflow speed is 20-25 m/s, and long-distance conveying is realized under the conveying power provided by a third induced draft fan 53. The coal powder is conveyed and enters the decomposing furnace 7 through the coal-as-fired nozzle 37, so that the rapid combustion is realized, and the processes of heating dehydration and carbonate decomposition of raw materials are participated.

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 belt conveyer 48 is arranged below the outlet of the iron remover 47, and the purpose of the belt conveyer is to lift the primarily crushed blade particles to a proper height, so as to facilitate the subsequent treatment of the blade particles and connect the blade particles into a kiln gas power conveying system. A crusher 49 is connected downstream of the belt conveyor 48, and the crusher 49 can further crush the lump raw material into leaf particles having an average particle size of-2 mm. The particles are discharged from the crusher 49 by a third discharge auger 50.

A connecting pipe is arranged at a proper position of the coal as fired conveying pipe 11 close to the fan coal mill 52 and is directly connected to an outlet of the third discharging auger 50, and the blade particle treatment capacity is controlled by adjusting the opening degree of the second stop valve 19 and the operation of the third discharging auger 50. After falling into the coal-as-fired conveying pipe 11, the blade particles are also conveyed pneumatically under the action of high-speed airflow, can be relatively uniformly mixed with pulverized coal in the whole conveying process, and finally enter the decomposing furnace 7 through the coal-as-fired nozzle 37.

Because of the exothermic high temperature environment who produces of fuel burning in the dore furnace 7 for the discarded blade granule that spout in the lump and buggy can both be heated rapidly and burn: the organic composite material contained in the blade particles is heated and decomposed, and the cracking products are ignited, so that the blade particles are fired like coal powder until the blade particles are burnt out. I.e. the organic composite material in the blade particles forms smoke and releases heat. After the combustible is cracked/combusted, the residual glass fiber, the combusted coal powder and ash slag formed by the combustion of the coal powder are mixed into raw materials to enter a downstream suspension preheater 5, and finally the raw materials are separated and returned to a rotary kiln 15 to be burnt into clinker and discharged through a clinker discharge pipe 16.

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 system for disposing waste fan blades in a decomposing furnace is characterized by comprising a blade crushing and smashing system, a raw material feeding system, a flue gas treatment system, a suspension preheater (5), the decomposing furnace (7), a rotary kiln (15), a clinker cooling device (17) and a fan coal mill (52);

one end of the rotary kiln (15) is connected with a smoke chamber (14), the other end of the rotary kiln is provided with a kiln head end plate (44), a kiln coal inlet nozzle (39) is arranged on the kiln head end plate (44), and the kiln coal inlet nozzle (39) is connected with a kiln coal inlet pipe (10) and a kiln coal inlet pipe (20);

the decomposing furnace (7) comprises a decomposing furnace cylinder body (41), and a material return pipe (9), a plurality of tertiary air nozzles (36) and a plurality of coal as fired nozzles (37) are respectively arranged on the decomposing furnace cylinder body (41); 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), a swirler (38) is arranged in the gradually expanding connecting flue (60), and the swirler (38) comprises a plurality of circumferentially and uniformly distributed swirl plates (40); the plurality of coal as fired nozzles (37) are connected with a fan coal mill (52) through a coal as fired conveying pipe (11), and a third induced draft fan (53) is arranged on the coal as fired conveying pipe (11); the fan coal mill (52) is connected with an air inlet pipe and is connected with the clinker cooling device (17) through a coal milling exhaust pipe (21), and a second blower (51) is arranged on the air inlet pipe;

the blade crushing and smashing system is connected with a coal as fired conveying pipe (11); a coal entering air draft branch pipe is connected to the coal grinding air draft pipe (21) and is connected to a coal grinding system of the rotary kiln (15); a fifth stop valve (64) is arranged on the coal entering air draft branch pipe, and a fourth stop valve (55) is arranged on the coal grinding air draft pipe (21) behind the coal entering air draft branch pipe; the smoke chamber (14) is connected with the 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 flue gas entry and the flue gas pipeline (8) of suspension preheater (5) are connected, go into kiln raw material exit linkage and go into kiln raw material conveyer pipe (6), go into kiln raw material conveyer pipe (6) and be connected with smoke chamber (14), and the returning charge export is connected with returning charge pipe (9), and the raw material inlet pipe is connected with raw material feed system, and the exhanst gas outlet is connected with flue gas treatment system.

2. The system for disposing of waste fan blades in a decomposition furnace according to 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 is connected with a clinker discharge port (24), one side of the cooling chamber is provided with a plurality of first blowers (23), and the other side is respectively connected with a tertiary air pipe (12), a secondary air pipe (18), a coal grinding exhaust pipe (21), an exhaust gas pipe (22) and the clinker discharge port (24); the tertiary air pipe (12) is connected with the tertiary air nozzle (36), the secondary air pipe (18) is connected with a secondary air port of the rotary kiln (15), and the coal grinding extraction pipe (21) is connected with a fan coal mill (52).

3. The system for disposing of waste fan blades in a decomposition furnace according to claim 2, wherein the secondary air duct (18), the tertiary air duct (12), the coal grinding extraction duct (21) and the exhaust air duct (22) are arranged in sequence from the inlet end to the outlet end of the cooling chamber, respectively.

4. The system for disposing of waste fan blades in a decomposing furnace according to claim 1, wherein the suspension preheater (5) comprises a multi-stage cyclone, a flue gas inlet of the last stage cyclone is connected to a flue gas duct (8), a kiln raw material feeding duct (6) is connected to a bottom outlet of the last stage cyclone, and the kiln raw material feeding duct (6) is connected to the 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, the 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.

5. The system for disposing of waste fan blades in a decomposition furnace according to claim 1, wherein the blade crushing and pulverizing system comprises a crusher (46), a de-ironing separator (47), a belt conveyor (48) and a pulverizer (49) connected in sequence, and the pulverizer (49) is connected with the kiln coal inlet pipe (20) through a third discharge auger (50).

6. The system for disposing the waste fan blade in the decomposing furnace according to 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.

7. The system for disposing the waste fan blade in the decomposition furnace according to 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).

8. The system for disposing of waste fan blades in a decomposing furnace according to claim 1, wherein a plurality of coal-as-fired nozzles (37) 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) 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 direction.

9. The system for disposing the waste fan blade in the decomposing furnace according to claim 8, wherein the plurality of coal-as-fired nozzles (37) and the plurality of tertiary air nozzles (36) are circumferentially and uniformly distributed at the same height position of the decomposing furnace cylinder (41) and form an included angle of 45-60 degrees with the radial direction of the decomposing furnace cylinder (41).

10. The method of operating a system for disposing of waste fan blades in a pyrolysis furnace according to any one of claims 1 to 9, comprising:

raw coal is processed into coal powder with proper particle size by a fan coal mill (52) and enters a coal-as-fired conveying pipe (11), waste blades are processed into blade particles by a blade crushing and crushing system and are immersed into the coal-as-fired conveying pipe (11) together with the coal powder, tertiary air is sprayed into a decomposing furnace (7) by a tertiary air nozzle (36), high-temperature flue gas from a rotary kiln (15) becomes rotational flow to promote combustion of the coal powder through a rotary kiln gas flue (13) under the action of a swirler (38) in a gradually-expanded connecting flue (60), the generated high-temperature flue gas wraps the coal powder, the coal ash and raw materials from a return pipe (9), and enters a suspension preheater (5) through a flue gas pipeline (8) to preheat the raw materials from a raw material feeding system; the flue gas separated by the suspension preheater (5) is discharged into a flue gas treatment system for treatment; 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); after the flow of a part of hot gas from the coal grinding exhaust pipe (21) is regulated by a fourth stop valve (55), the hot gas is mixed with normal-temperature air provided by a second air feeder (51) and enters a coal as fired conveying pipe (11), and fully mixed blade particles and coal powder are injected into a decomposing furnace (7) through a coal as fired nozzle (37) under the action of a third induced draft fan (53); the other part of hot gas from the coal grinding exhaust pipe (21) is conveyed to a coal grinding system of the rotary kiln (15) through a coal entering exhaust branch pipe after the flow of the hot gas is adjusted by a fifth stop valve (64); the blade particles entering the decomposing furnace (7) are heated rapidly, the organic composite materials contained in the blade particles are heated and decomposed, the cracking products are ignited to form smoke and release heat, and the coal particles are combusted and release heat in a high-temperature secondary air environment; the residual glass fiber, the burning coal dust and ash slag formed by the coal dust fall into the raw material, are mixed into the raw material to enter a downstream suspension preheater (5), are finally separated and are returned to a rotary kiln (15) through a smoke chamber (14) by a raw material conveying pipe (6) entering the kiln, are burnt into clinker together and are discharged into a clinker cooling device (17) through a clinker discharging pipe (16), and are discharged out of the system through a clinker discharging port (24) after being cooled.