Ultralow-temperature crushing process for retired wind power blade

Abstract

The invention discloses an ultralow-temperature crushing process for an out-of-service wind power blade, and relates to the technical field of green environmental protection, and the ultralow-temperature crushing process is characterized by comprising the following steps: step 1, taking the out-of-service wind power blade, cutting the out-of-service wind power blade to form a small-size wind power blade plate, and cleaning stains on the surface of the wind power blade plate for later use; 2, the wind power blade plate is placed in the long-strip-shaped cavity, the long-strip-shaped cavity is filled with clear water, firstly, heating is conducted to 50-100 DEG C, heat preservation is conducted for 2-5 min, then after the temperature is reduced to the room temperature, the long-strip-shaped cavity is frozen to-12 DEG C or below, and long-strip-shaped ice bars are obtained; 3, the temperature is controlled to be-150 DEG C or below, an ultrasonic vibrator acts on the long-strip-shaped cavity, and a pre-crushed blade plate is obtained after crushing treatment; 4, the temperature is controlled to be below-150 DEG C, the pre-crushed blade plate is guided into a wind power blade shredding machine to be crushed, and particulate matter is obtained; and 5, classifying the particles to form glass fiber particles, resin particles and balsa wood particles. The wind power blade recycling device has the effects of reducing the wind power blade recycling difficulty and improving the economical efficiency.

Description

Technical Field

[0001] The present invention relates to the field of green environmental protection technology, and more specifically to an ultra-low temperature crushing process for retired wind turbine blades. Background Art

[0002] Wind turbine blades are typically made of glass fiber or carbon fiber reinforced composites, which are strong and lightweight, but are complicated to handle after retirement due to their large size and resistance to degradation.

[0003] The crushing equipment in the existing technology has certain difficulties in processing glass fibers. Therefore, for the processing of wind turbine blades, more powerful equipment must be used, namely wind turbine blade shredders. Wind turbine blade shredder is a high-efficiency equipment designed specifically for the processing of waste wind turbine blades. It uses advanced shredding technology to effectively tear and process waste wind turbine blades. Among them, the effective decomposition and processing of the fiber structure of glass fibers is one of the core tasks of the wind turbine blade shredder. With the rapid development of the wind power industry and the emphasis on sustainability, the technology of wind turbine blade shredders is constantly improving, including improving crushing efficiency, reducing energy consumption, extending tool life, and reducing environmental impact. At the same time, policymakers and industry participants are also exploring more effective blade recycling strategies to promote the development of a green circular economy in the wind power industry.

[0004] However, since the structural materials of wind turbine blades are mainly composed of glass fiber, resin and balsa wood composite materials, the recycling of wind turbine blades requires high energy input and puts great pressure on the wear of the cutting tools, resulting in high recycling costs for wind turbine blades, which needs to be improved. Summary of the invention

[0005] In view of this, the purpose of this application is to provide a super-low temperature crushing process for retired wind turbine blades, so as to reduce energy consumption and improve the economic efficiency of wind turbine blade recycling. The specific scheme is as follows:

[0006] A process for ultra-low temperature crushing of retired wind turbine blades comprises the following steps:

[0007] Step 1: Take retired wind turbine blades, cut them into small-sized wind turbine blade plates, and clean the surface stains of the wind turbine blade plates for later use;

[0008] Step 2, placing the wind turbine blade plate into the long strip mold cavity and filling the long strip mold cavity with water, first heating to 50-100°C and keeping warm for 2-5 minutes, then cooling to room temperature and freezing the long strip mold cavity to below -12°C to obtain a long strip ice bar;

[0009] Step 3, controlling the temperature to be below -150° C., applying an ultrasonic vibrator to the long strip cavity, crushing the ice in the long strip cavity and the wind turbine blade plate covered by the ice, and obtaining a pre-crushed blade plate;

[0010] Step 4, controlling the temperature to be below -150° C., introducing the pre-crushed blade plate into a wind turbine blade shredder for crushing, and obtaining particles;

[0011] Step 5: Classify the particles into glass fiber particles, resin particles and balsa wood particles.

[0012] Preferably: in step 1, the small size specification of the wind turbine blade plate is 10-30cm*50-200cm.

[0013] Preferably, in step 2, the long ice strips are subjected to 1-5 heating and freezing processes.

[0014] Preferably: in step 3, the ultrasonic vibration frequency of the ultrasonic vibrator is 30-35 KHz, and the ultrasonic amplitude is 15-40 μm.

[0015] Preferably, the ultrasonic probe of the ultrasonic vibrator acts downward on the elongated cavity and applies a pressure of 0.5-0.6 MPa to the elongated cavity.

[0016] Preferably, in step 5, an airflow separator is used to screen and obtain glass fiber particles, resin particles and balsa wood particles.

[0017] Preferably, the water contains sodium chloride, and the content of sodium chloride is 1.2-2.8 g / L.

[0018] It can be seen from the above scheme that the present application provides an ultra-low temperature crushing process for retired wind turbine blades, and the ultra-low temperature crushing process for retired wind turbine blades has the following beneficial effects: by using high temperature to fill water in the wind turbine blade plate, and then applying force to the fiber structure of the glass fiber and the composite structure between the glass fiber, resin and balsa wood based on the volume increase caused by the freezing of water and the ice crystals formed, thereby reducing the overall structural strength of the wind turbine blade plate while reducing the difficulty of crushing the wind turbine blade plate by the ultrasonic vibrator, thereby effectively reducing energy input and reducing the wear pressure on the tool, so as to achieve the purpose of reducing energy consumption and improving the economy of wind turbine blade recycling. DETAILED DESCRIPTION

[0019] In order to make the technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] It should be mentioned that the low-temperature environments used in the embodiments of the present application are all implemented using existing equipment, such as liquid nitrogen at -196°C, liquid hydrogen at -269°C, He-3 at -271°C, etc. as low-temperature sources, which will not be elaborated here.

[0021] The following is a detailed description of the ultra-low temperature crushing process for retired wind turbine blades of the present application.

[0022] A process for ultra-low temperature crushing of retired wind turbine blades comprises the following steps:

[0023] Step 1: Take retired wind turbine blades, cut them into small-sized wind turbine blade plates, and clean the surface stains of the wind turbine blade plates for later use;

[0024] Step 2, placing the wind turbine blade plate into the long strip mold cavity and filling the long strip mold cavity with water, first heating to 50-100°C and keeping warm for 2-5 minutes, then cooling to room temperature and freezing the long strip mold cavity to below -12°C to obtain a long strip ice bar;

[0025] Step 3, controlling the temperature to be below -150° C., applying an ultrasonic vibrator to the long strip cavity, crushing the ice in the long strip cavity and the wind turbine blade plate covered by the ice, and obtaining a pre-crushed blade plate;

[0026] Step 4, controlling the temperature to be below -150° C., introducing the pre-crushed blade plate into a wind turbine blade shredder for crushing, and obtaining particles;

[0027] Step 5: Classify the particles into glass fiber particles, resin particles and balsa wood particles.

[0028] It should be noted that in step 1, the small size specification of the wind turbine blade plate is 10-30cm*50-200cm. And the elongated cavity matches the wind turbine blade plate. In step 2, the elongated ice strip is subjected to 1-5 heating and freezing processes. The heating and freezing process of multiple heating and freezing has the effect of further reducing the difficulty of crushing, but at the same time will lead to energy consumption. In step 3, the ultrasonic vibration frequency of the ultrasonic vibrator is controlled to be 30-35KHz, and the ultrasonic amplitude is 15-40μm. And the ultrasonic probe of the ultrasonic vibrator acts downward on the elongated cavity, and applies a pressure of 0.5-0.6MPa to the elongated cavity. In step 5, an airflow sorter is used to screen and obtain glass fiber particles, resin particles and balsa wood particles.

[0029] In order to further enhance the destructive strength of water freezing on wind turbine blades, sodium chloride is contained in the water, and the content of sodium chloride is 1.2-2.8g / L. If the content of sodium chloride increases, the freezing point of water will decrease, which will affect energy consumption.

[0030] Embodiment 1

[0031] A process for ultra-low temperature crushing of retired wind turbine blades comprises the following steps:

[0032] Step 1: Take the retired wind turbine blades and cut them into small-sized wind turbine blade plates. The small-sized specification of the wind turbine blade plates is 10cm*50cm. Then clean the surface stains of the wind turbine blade plates for later use.

[0033] Step 2, placing the wind turbine blade plate into the long strip mold cavity and filling the long strip mold cavity with water, and obtaining a long strip ice bar after a heating and freezing process; wherein the heating and freezing process is firstly heating to 50°C and keeping warm for 2 minutes, then cooling to room temperature and freezing the long strip mold cavity to -15°C;

[0034] Step 3, controlling the temperature to -150°C, applying an ultrasonic vibrator to the elongated cavity, crushing the ice in the elongated cavity and the wind turbine blade plate covered by ice, controlling the ultrasonic vibration frequency of the ultrasonic vibrator to be 30KHz, and the ultrasonic amplitude to be 15μm; and applying an ultrasonic probe of the ultrasonic vibrator downward to the elongated cavity, and applying a pressure of 0.5MPa to the elongated cavity, to obtain a pre-crushed blade plate;

[0035] Step 4, controlling the temperature to -155°C, introducing the pre-crushed blade plate into a wind turbine blade shredder for crushing to obtain particles;

[0036] Step 5: Use an airflow classifier to screen and classify the particles into glass fiber particles, resin particles and balsa wood particles.

[0037] Embodiment 2

[0038] A process for ultra-low temperature crushing of retired wind turbine blades comprises the following steps:

[0039] Step 1: Take the retired wind turbine blades and cut them into small-sized wind turbine blade plates. The small-sized specification of the wind turbine blade plates is 20cm*100cm. Then clean the surface stains of the wind turbine blade plates for standby use.

[0040] Step 2, placing the wind turbine blade plate into the long strip mold cavity and filling the long strip mold cavity with water, and obtaining a long strip ice bar after three heating and freezing processes; wherein the heating and freezing process is firstly heating to 60°C and keeping warm for 3 minutes, then cooling to room temperature and freezing the long strip mold cavity to -13°C;

[0041] Step 3, controlling the temperature to -196°C, applying an ultrasonic vibrator to the elongated cavity, crushing the ice in the elongated cavity and the wind turbine blade plate covered by ice, controlling the ultrasonic vibration frequency of the ultrasonic vibrator to be 32KHz, and the ultrasonic amplitude to be 30μm; and applying an ultrasonic probe of the ultrasonic vibrator downward to the elongated cavity, and applying a pressure of 0.55MPa to the elongated cavity, to obtain a pre-crushed blade plate;

[0042] Step 4, controlling the temperature to -150°C, introducing the pre-crushed blade plate into a wind turbine blade shredder for crushing to obtain particles;

[0043] Step 5: Use an airflow classifier to screen and classify the particles into glass fiber particles, resin particles and balsa wood particles.

[0044] Embodiment 3

[0045] A process for ultra-low temperature crushing of retired wind turbine blades comprises the following steps:

[0046] Step 1: Take the retired wind turbine blades and cut them into small-sized wind turbine blade plates. The small-sized specification of the wind turbine blade plates is 30cm*200cm. Then clean the surface stains of the wind turbine blade plates for standby use.

[0047] Step 2, placing the wind turbine blade plate into the long strip mold cavity and filling the long strip mold cavity with water, and obtaining a long strip ice bar after 5 heating and freezing processes; wherein the heating and freezing process is firstly heating to 100°C and keeping warm for 5 minutes, then cooling to room temperature and freezing the long strip mold cavity to -18°C; the water contains sodium chloride, and the content of sodium chloride is 1.2g / L;

[0048] Step 3, controlling the temperature to -180°C, applying an ultrasonic vibrator to the elongated cavity, crushing the ice in the elongated cavity and the wind turbine blade plate covered by ice, controlling the ultrasonic vibration frequency of the ultrasonic vibrator to be 35KHz, and the ultrasonic amplitude to be 40μm; and applying an ultrasonic probe of the ultrasonic vibrator downward to the elongated cavity, and applying a pressure of 0.6MPa to the elongated cavity, to obtain a pre-crushed blade plate;

[0049] Step 4, controlling the temperature to -196°C, introducing the pre-crushed blade plate into a wind turbine blade shredder for crushing to obtain particles;

[0050] Step 5: Use an airflow classifier to screen and classify the particles into glass fiber particles, resin particles and balsa wood particles.

[0051] Embodiment 4

[0052] The difference between Example 4 and Example 3 is that the content of sodium chloride in Example 4 is 2.8 g / L.

[0053] Embodiment 5

[0054] The difference between the fifth embodiment and the third embodiment is that the small size specification of the wind turbine blade plate in the fifth embodiment is 10 cm*50 cm.

[0055] Embodiment 6

[0056] The difference between Example 6 and Example 3 is that no sodium chloride is added to the water in Example 6.

[0057] Embodiment 7

[0058] The difference between Example 7 and Example 1 is that sodium chloride is added to the water in Example 7 and the content of sodium chloride is 1.5 g / L.

[0059] Comparative Example 1

[0060] The difference between Comparative Example 1 and Example 1 is that in step 2 of Comparative Example 1, the wind turbine blade plate is placed in the elongated cavity and the elongated cavity is filled with water, and then the elongated cavity is frozen to below -12°C after cooling to room temperature to obtain elongated ice bars.

[0061] Comparative Example 2

[0062] The difference between Comparative Example 2 and Example 1 is that, in Comparative Example 2, step 2 and step 3 are not performed, and the crushing process is performed at room temperature.

[0063] Comparative Example 3

[0064] The difference between Comparative Example 3 and Example 1 is that step 3 is not performed in Comparative Example 3.

[0065] Performance Test:

[0066] 1. Wear test: After the same number of wind turbine blades are crushed, the wear degree of the cutter is tested and marked as I, II, III, IV, and V from low to high according to the severity of wear. At the same time, (+), (=) and (-) are used to represent high, balanced, and low.

[0067] Performance tests were conducted on Examples 1 to 6 and Comparative Examples 1 to 3, and the test results are shown in Table 1 below.

[0068] Table 1 Performance test results

[0069]

[0070]

[0071] It can be seen from Table 1 above that by reducing the size of the wind turbine blade plate, it will be helpful to reduce the difficulty of the ultrasonic vibrator in crushing the wind turbine blade plate; at the same time, through the heating and freezing process, and especially multiple heating and freezing processes, it will be helpful to reduce the difficulty of the ultrasonic vibrator in crushing the wind turbine blade plate; and when a certain amount of sodium chloride is added to the water, it will be helpful to reduce the difficulty of the ultrasonic vibrator in crushing the wind turbine blade plate.

[0072] In summary, the present application provides an ultra-low temperature crushing process for retired wind turbine blades. The ultra-low temperature crushing process for retired wind turbine blades uses high temperature to fill water in the wind turbine blade plate, and then applies force to the fiber structure of the glass fiber and the composite structure between the glass fiber, resin and balsa wood based on the volume increase caused by the freezing of water and the ice crystals formed. While reducing the overall structural strength of the wind turbine blade plate, it reduces the difficulty of crushing the wind turbine blade plate by the ultrasonic vibrator, thereby effectively reducing energy input and reducing the wear pressure on the tool, so as to achieve the purpose of reducing energy consumption and improving the economy of wind turbine blade recycling.

[0073] The "first", "second", "third", "fourth", etc. (if any) referred to in this application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments described herein can be implemented in an order other than that described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods or devices.

[0074] It should be noted that the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0075] Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A process for ultra-low temperature crushing of retired wind turbine blades, characterized in that: The steps include: Step 1: Take retired wind turbine blades, cut them into small-sized wind turbine blade plates, and clean the surface stains of the wind turbine blade plates for later use; Step 2, placing the wind turbine blade plate into the long strip mold cavity and filling the long strip mold cavity with water, first heating to 50-100°C and keeping warm for 2-5 minutes, then cooling to room temperature and freezing the long strip mold cavity to below -12°C to obtain a long strip ice bar; Step 3, controlling the temperature to be below -150° C., applying an ultrasonic vibrator to the long strip cavity, crushing the ice in the long strip cavity and the wind turbine blade plate covered by the ice, and obtaining a pre-crushed blade plate; Step 4, controlling the temperature to be below -150° C., introducing the pre-crushed blade plate into a wind turbine blade shredder for crushing, and obtaining particles; Step 5: Classify the particles into glass fiber particles, resin particles and balsa wood particles.

2. The ultra-low temperature crushing process for retired wind turbine blades according to claim 1 is characterized in that: In step 1, the small size specification of the wind turbine blade plate is 10-30cm*50-200cm.

3. The ultra-low temperature crushing process for retired wind turbine blades according to claim 1 is characterized in that: In step 2, the long ice strips are subjected to 1-5 heating and freezing processes.

4. The ultra-low temperature crushing process for retired wind turbine blades according to claim 1 is characterized in that: In step 3, the ultrasonic vibration frequency of the ultrasonic vibrator is 30-35 KHz, and the ultrasonic amplitude is 15-40 μm.

5. The ultra-low temperature crushing process for retired wind turbine blades according to claim 4 is characterized in that: The ultrasonic probe of the ultrasonic vibrator acts downward on the elongated cavity and applies a pressure of 0.5-0.6 MPa to the elongated cavity.

6. The ultra-low temperature crushing process for retired wind turbine blades according to claim 1 is characterized in that: In step 5, an airflow classifier is used to screen and obtain glass fiber particles, resin particles and balsa wood particles.

7. The ultra-low temperature crushing process for retired wind turbine blades according to claim 1 is characterized in that: The water contains sodium chloride, and the content of sodium chloride is 1.2-2.8 g / L.

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