CN-118143022-B - Method for recycling wind power blade

CN118143022BCN 118143022 BCN118143022 BCN 118143022BCN-118143022-B

Abstract

The invention belongs to the field of recycling of thermosetting composite materials, and particularly relates to a method for recycling wind power blades, which comprises the steps of cutting the wind power blades into large fragments by a laser cutting machine, and collecting a powdery mixture generated during cutting; the method comprises the steps of placing large fragments into a plasma low-temperature ashing instrument for low-temperature ashing to obtain glass fibers, sorting the powdery mixture by an airflow sorting machine to obtain a mixture of glass fibers and epoxy resin powder and powder of Sha Mufen, and carrying out electrostatic sorting on the mixture of glass fibers and epoxy resin powder to obtain glass fiber powder and epoxy resin powder. According to the method for recycling the wind power blade, the glass fiber is treated by the plasma low-temperature ashing instrument, the system can keep low temperature in the treatment process, and the whole sample is not heated, so that the obtained glass fiber has high strength, small loss of tensile strength, long fiber length and high recycling value.

Inventors

Feng jinting
GONG JIA
ZHANG TAO
Xue Qisen
HUANG YOUHUA
CHEN PISHAN
HAN WENLI
ZHAO HUAQING
WANG YUZHU
LIU YANJIE

Assignees

北辰先进循环科技(青岛)有限公司

Dates

Publication Date: 20260508
Application Date: 20240411

Claims (7)

1. The method for recycling the wind power blade is characterized by comprising the following steps of: cutting the wind power blade into large fragments by a laser cutting machine, and collecting a powdery mixture generated during cutting; placing the large fragments into a plasma low-temperature ashing instrument for low-temperature ashing to obtain glass fibers; sorting the powdery mixture by an airflow sorting machine to obtain a mixture of glass fibers and epoxy resin powder and a powder of the bara Sha Mufen; electrostatic separation is carried out on the mixture of the glass fiber and the epoxy resin powder, and the glass fiber powder and the epoxy resin powder are separated; The airflow sorting machine comprises a sorting barrel (1), wherein the top of the sorting barrel (1) is connected with a barrel cover (2), a feeding barrel (3) is connected in a central hole of the barrel cover (2), a lower discharge opening (4) is arranged at the bottom of the sorting barrel (1), an upper discharge opening (5) is arranged above the lateral part of the sorting barrel (1), a material dispersing component (6) is rotationally connected with the sorting barrel (1), and the upper part of the material dispersing component (6) is connected with a power component (7) arranged on the barrel cover (2), an inclined air inlet pipe (8) is arranged below the lateral part of the sorting barrel (1), and the horizontal height of a pipe body inserted into the sorting barrel (1) by the inclined air inlet pipe (8) is higher than the horizontal height of the pipe body extending out of the sorting barrel (1); The material dispersing component (6) comprises a supporting frame (601) transversely arranged in the separation cylinder (1), a dispersing rotating shaft (602) is connected in a sliding manner in a central circle of the supporting frame (601), a material dispersing disc (603) fixed on the dispersing rotating shaft (602) is positioned between an inclined air inlet pipe (8) and an upper discharge hole (5), a pressure spring (604) is fixed between the material dispersing disc (603) and the supporting frame (601), the pressure spring (604) is sleeved on the dispersing rotating shaft (602), a plurality of longitudinal sliding holes are uniformly arranged on the material dispersing disc (603) in a surrounding manner, a plurality of longitudinal shafts (605) are in sliding fit in the longitudinal sliding manner, the tops of the longitudinal shafts (605) are fixedly connected with a grading wheel (606), a plurality of vortex impellers are uniformly arranged on the outer wheel surface of the grading wheel (606), the inner side surface of the grading wheel (606) is in rotating fit on the outer side surface of the feeding cylinder (3), a rotating connection shaft bracket (607) is arranged on a shaft body (14) penetrating out of the feeding cylinder (3), the dispersing rotating shaft (602) is in a sliding manner on the top of the vertical guide shaft (607) of the top of the cylinder cover (2), the shaft bracket (607) is in a sliding manner, the shaft bracket (608) is connected on the shaft (608) in a rotating manner, a bevel gear I fixed at one end of the transverse rotating shaft (608) is meshed with a bevel gear fixed on the dispersing rotating shaft (602), and a friction disc (609) fixed at the other end of the transverse rotating shaft (608) is connected with the power component (7); The power component (7) comprises a motor arranged on the cylinder cover (2), a friction wheel on an output shaft of the motor is vertically in friction connection with a friction disc (609), and the friction wheel is positioned below the transverse rotating shaft (608); The friction wheel is driven to rotate after the motor is started, the friction wheel drives the friction disc (609) to rotate through vertical friction when the friction wheel rotates, the friction disc (609) rotates to drive the transverse rotating shaft (608) to rotate, the bevel gear I on the transverse rotating shaft (608) is meshed with the bevel gear fixed on the dispersing rotating shaft (602), the dispersing rotating shaft (602) is driven to rotate, the dispersing rotating shaft (602) drives the material dispersing disc (603) to rotate, the classifying wheel (606) is driven to rotate through a plurality of longitudinal shafts (605) when the material dispersing disc (603) rotates, a plurality of vortex impellers are uniformly arranged on the outer wheel surface of the classifying wheel (606) in a surrounding mode, when the speed of a powdery mixture falling on the material dispersing disc (603) through the feeding barrel (3) is high and the weight is high, impact force of the powdery mixture on the material dispersing disc (603) is large, the material dispersing rotating shaft (602) is driven to slide downwards on the supporting frame (601) and compress the pressure spring (604), openings between the material dispersing rotating disc (603) and the classifying wheel (606) are large, when the dispersing rotating shaft (607) slides downwards, the friction cover (607) is driven to slide downwards on the shaft center of the guide disc (609), and the friction disc (609) is driven to slide downwards when the shaft cover (2) slides downwards.
2. The method for recycling wind power blades according to claim 1, wherein the size of the large pieces is 0.5 x 0.5m.
3. The method for recycling wind power blades according to claim 1, wherein the cutting speed of the laser cutting machine is 10-20m/min, and the laser output power of the laser cutting machine is 200-500W.
4. The method for recycling wind power blades according to claim 1, wherein when the plasma low-temperature ashing instrument performs low-temperature ashing on massive fragments, the reaction temperature of the plasma low-temperature ashing instrument is 100-150 ℃, the ultrapure oxygen flow is 1-3L/min, the plasma output power is 30-75W, the reaction time is 1-5h, and the operation vacuum degree is 0.04-0.1kPa.
5. The method for recycling wind power blades according to claim 1, wherein when the powdery mixture is separated by an air flow separator, the air flow speed of the air flow separator is 8-11m/s, and the pulsation frequency is 1-5Hz.
6. The method for recycling wind power blades according to claim 1, wherein when the mixture of glass fibers and epoxy resin powder is subjected to electrostatic classification, the electrostatic classification voltage is 25-50kV, and the rotating speed is 60-80rpm.
7. The method for recycling wind power blades according to claim 1, wherein the upper surface of the classifying wheel (606) is uniformly and circumferentially fixed with one end of a plurality of bending connecting rods (610), the other end of the plurality of bending connecting rods (610) is rotationally connected with a plurality of rotating cross shafts (611), dispersing impellers (612) are fixedly arranged on the plurality of rotating cross shafts (611), a linkage gear (613) fixedly arranged on the plurality of rotating cross shafts (611) is meshed with an end face gear ring fixedly arranged in the classifying cylinder (1), the end face gear ring is positioned above the linkage gear (613), and the rotating cross shafts (611) are positioned between the classifying wheel (606) and the material dispersing disc (603).

Description

Method for recycling wind power blade Technical Field The invention belongs to the field of recycling of thermosetting composite materials, and particularly relates to a method for recycling wind power blades. Background With the development of the wind power industry in China, wind power generation is already the third largest power generation mode after thermal power and hydropower. While the clean energy sources are greatly developed in China, the number of retired wind power blades is increased, and how to recycle the wind power blades in a high-valued manner becomes a great difficulty in obstructing the development of the wind power industry. At present, the mode of recovering and treating wind power blades at home and abroad is mainly divided into a mechanical recovery method, a heat recovery method and a chemical method. The mechanical recovery method has the advantages of short length of the recovered glass fiber, serious mechanical property loss and low recovery value, the heat recovery method has the advantages of great intensity loss of the recovered glass fiber, higher reaction cost, long length of the glass fiber recovered by the chemical method and high cleanliness, but serious reagent pollution and high cost, and therefore, the method cannot be industrially applied. It is clear that at present, no mature technical path exists in China to face the out-of-service tide of the wind power blade, so that the recovery treatment of the wind power blade is both an opportunity and a challenge for the whole industry. Disclosure of Invention The invention aims to solve the problems in the prior art and provides a method for recycling wind power blades. The aim of the invention is achieved by the following technical scheme: A method for recycling wind power blades comprises the following steps: cutting the wind power blade into large fragments by a laser cutting machine, and collecting a powdery mixture generated during cutting; placing the large fragments into a plasma low-temperature ashing instrument for low-temperature ashing to obtain glass fibers; sorting the powdery mixture by an airflow sorting machine to obtain a mixture of glass fibers and epoxy resin powder and a powder of the bara Sha Mufen; And carrying out electrostatic separation on the mixture of the glass fiber and the epoxy resin powder to separate the glass fiber powder and the epoxy resin powder. Optionally, the size of the large pieces is 0.5 x 0.5m. Optionally, the cutting speed of the laser cutting machine is 10-20m/min, and the laser output power of the laser cutting machine is 200-500W. Optionally, when the low-temperature plasma ashing instrument performs low-temperature ashing on the massive fragments, the reaction temperature of the low-temperature plasma ashing instrument is 100-150 ℃, the ultrapure oxygen flow is 1-3L/min, the plasma output power is 30-75W, the reaction time is 1-5h, and the operation vacuum degree is 0.04-0.1kPa. Optionally, when the powdery mixture is separated by the airflow separator, the airflow speed of the airflow separator is 8-11m/s, and the pulsation frequency is 1-5Hz. Optionally, when the mixture of glass fibers and epoxy resin powder is subjected to electrostatic separation, the electrostatic separation voltage is 25-50kV, and the rotating speed is 60-80rpm. The invention has the following beneficial effects: According to the method for recycling the wind power blade, the glass fiber is treated by the plasma low-temperature ashing instrument, the system can keep low temperature in the treatment process, and the whole sample is not heated, so that the obtained glass fiber has high strength, small tensile strength loss, long fiber length and high recycling value. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention as claimed. Drawings The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. FIG. 1 is a flow chart of steps for recycling wind power blades provided by an embodiment of the invention; fig. 2 is a schematic view of a first view angle of an airflow classifier according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a second view of an airflow classifier according to an embodiment of the present invention; FIG. 4 is a cross-sectional view of an airflow classifier provided by an embodiment of the present invention; FIG. 5 is a schematic view of a cartridge according to an embodiment of the present invention; FIG. 6 is a schematic view of a feed cylinder according to an embodiment of the present invention; FIG. 7 is a schematic view of a material dispersing unit according to an embodiment of the present invention; FIG. 8 is a schematic diagram of a partial str