Method for co-processing of wind turbine damaged blades in a cement kiln

Abstract

The present application relates to the technical field of wind power generation broken blade disposal, and in particular to a method for cement kiln collaborative disposal of wind power generation broken blades; in the method, the broken wind power generation blades are cut into small blade pieces by a water jet cutting machine, the small blade pieces are sent into a shredder for cyclic shredding, and the shredded pieces are passed through a drum screen, the oversize pieces are sent into the shredder for cyclic shredding, and the undersize pieces are sent into a pyrolysis furnace for pyrolysis, and the slag produced by pyrolysis is collected for resource utilization. The method also provides an organic metal material capable of adsorbing dioxin, which can effectively adsorb dioxin produced by incineration of the blades and reduce the impact on the environment.

Description

TECHNICAL FIELD

[0001] The application relates to a wind power generation damaged blade disposal technology field, in particular to a method for cooperatively disposing wind power generation damaged blades in a cement kiln. BACKGROUND

[0002] The main material of the fan blade is a polymer-based composite material (resin-based composite material, commonly known as glass steel), which has advantages that other materials do not have, such as light weight, high strength, corrosion resistance, designable performance (all directions of the material), and special performance in other aspects, and thus has become the only choice for the blade material of a large wind turbine generator unit. Of course, everything has two sides, on the one hand, it has incomparable excellent performance, and on the other hand, it also has a fatal defect, that is, the recycling and post-processing of the blade material after the end of the product's life cycle. The recycling and post-processing of the thermoplastic material such as plastic bottles can be recycled and reused, but the thermosetting composite material cannot be simply reused. The blade matrix material is epoxy resin, which cannot be reused after curing, and the glass fiber is solidified in the fiber body, which is extremely difficult to recycle. Even if the recycling and post-processing is carried out, environmental protection and high cost problems are also faced.

[0003] Patent No. CN201721711850.8 relates to a large wind power blade recycling system for recycling and utilizing large-size damaged blades, which comprises an on-site processing device and an off-site processing device. The on-site processing device is a water jet cutting machine (2) arranged at the installation site and used for dividing the large-size damaged blade (1) to be recycled into small-size blade pieces (3). The off-site processing device comprises a shredding unit, a crushing unit, an air flow sorting unit, an activation unit and a material forming unit arranged in sequence. Compared with the prior art, the utility model has low cost, stable and reliable operation, avoids material waste, improves material utilization rate and has wide application range of the lump-shaped mixture.

[0004] Patent No. CN202222096324.2 discloses a wind power generation material recycling device, which comprises a rack body, a conveying roller body fixedly installed on the inner wall of the rack body, a wind blade movably installed on the top of the conveying roller body, a light pole frame penetratingly installed on the top of the rack body, a spring inlaidly installed on the outer portion of the light pole frame, and a bearing frame fixedly installed on the bottom of the light pole frame. The first motor drives the compression roller body to rotate, and the compression roller body is in close contact with the outer surface of the wind blade. The compression roller body can drive the wind blade to move. The second motor drives the second crushing shaft to rotate. The two gears mesh to drive the first crushing shaft to rotate. The two crushing shaft cylinders can disintegrate and crush the wind blade. During the process, the first crushing shaft and the second crushing shaft do not bear the weight of the wind blade, so that the bending and deformation of the first crushing shaft and the second crushing shaft during the crushing process of the wind blade can be avoided.

[0005] The existing waste blade treatment process is very simple, and after cutting, part of it is used for plate recycling. Overall, the process, technology and related equipment are still in the initial stage. With the large-scale retirement of blades, the blade recycling market is entering a peak period. The thermosetting material properties of the blade determine that it cannot be degraded, and the cost of recycling the fiber material is also very high. The existing scheme cannot reach the stage of environmental protection and recycling.

[0006] Due to the presence of polyester resin and glass fiber in wind power blades, high-temperature treatment technology is usually required for disposal of these waste materials. Cement kiln co-processing is one of the effective ways to dispose of waste, but the high-temperature treatment process may release some harmful gases such as dioxin and hydrogen chloride.

[0007] When cement kiln co-processing wind power blades, the generation of dioxin is mainly due to the volatile organic compounds (VOC) and chloride ions produced during the decomposition of polyester resin, and then the chloride ions combine with alkaline metal elements under high temperature conditions to generate dioxin with strong toxicity. When co-processing wind power blades with a cement kiln, attention should be paid to controlling the generation of dioxin to reduce its impact on the environment. SUMMARY

[0008] (1) Technical problems solved

[0009] To overcome the shortcomings of the prior art, the present application provides a method for co-processing damaged wind power blades in a cement kiln, which is a resource and environmentally friendly solution for processing damaged wind power blades.

[0010] (2) Technical solutions

[0011] To achieve the above purpose, the present application is implemented by the following technical solutions:

[0012] A method for co-processing damaged wind power blades in a cement kiln, the operation steps are:

[0013] The damaged wind power blades are cut into small size blade pieces by a water jet cutting machine, and the small size blade pieces are sent to a shredder for circulating shredding. The roller screen is used to screen the shredded pieces, and the screened material is sent to the shredder for circulating shredding. The screened material is sent to a pyrolysis furnace for pyrolysis, and the flue gas generated by pyrolysis is sent to an adsorption tower for adsorption. The slag generated by pyrolysis is collected and mixed into cement raw materials in a certain proportion, and then sent to a rotary kiln for calcination to obtain cement clinker.

[0014] Further supplement, the size of the roller screen undersize is not more than 20mm.

[0015] Further supplement, the heat source of the cracking furnace is the flue gas of the three-stage preheater of the cement kiln.

[0016] Further supplement, the temperature of the cracking furnace is controlled at 700-750℃.

[0017] Further supplement, the pyrolysis time is 1-3 hours.

[0018] Further supplement, the pyrolysis waste gas first enters the adsorption tower, and then is combined into the three times air of the cement kiln.

[0019] Further supplement, the adsorption filler is added in the adsorption tower, and the addition amount is 30-45% of the volume content of the adsorption tower.

[0020] Further supplement, the adsorption filler is an organic metal material for adsorbing dioxin, and the preparation steps are as follows:

[0021] S1: according to weight parts, 80-100 parts of iron oxide, 3-6 parts of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, 300-500 parts of water, control the reaction temperature to be 50-70℃, react for 1-3h, filter, dry, and get the double amino silane treated iron oxide;

[0022] S2: 80-100 parts of double amino silane treated iron oxide, 2-5 parts of pentaerythritol triacrylate are mixed, 300-500 parts of DMF are added, 3-6 parts of sodium methoxide are added, and the reaction is carried out for 0.5-2h, then 0.05-0.4 parts of cerium methacrylate are added, and the reaction is carried out for 1-3h, then filtered, dried, and the organic metal material for adsorbing dioxin is obtained;

[0023] S3: mixed with activated carbon, and the addition amount is 0.1-0.6% of the mass percentage content of activated carbon, to obtain the adsorption filler.

[0024] Further supplement, when the slag is matched with the cement raw material, the slag ratio is 10-15%.

[0025] Further supplement, the calcination temperature of the cement raw material in the rotary kiln is 1200-1400℃.

[0026] Reaction mechanism: the double amino silane treated iron oxide reacts with pentaerythritol triacrylate to produce amino addition reaction, and then reacts with cerium methacrylate to produce amino addition reaction.

[0027] (Three) beneficial effects

[0028] 1. Technical effect: the method cooperatively disposes the damaged wind power blade in the cement kiln, not only realizes the resource utilization of waste, reduces the cost of waste treatment, but also provides heat energy for the cement kiln.

[0029] 2、Cerium element has strong crystal field effect, can react with dioxin, thereby degrading dioxin, can reduce oxygen molecules to oxide ions, produce cerium oxide and active oxygen species, and then decompose organic molecules. In addition, cerium element can also directly decompose organic molecules through catalytic action and surface chemical action. Due to the catalytic action of cerium element, its decomposition effect on dioxin is good, and it can work in a wide pH range. DETAILED DESCRIPTION

[0030] The application will be further explained in connection with the following examples. It should be noted that the following examples are only used to illustrate the application and not to limit the technical solutions described in the application, so all technical solutions and improvements that do not deviate from the spirit and scope of the application are covered in the claim scope of the application.

[0031] Example 1

[0032] A method for co-processing damaged wind power blades in a cement kiln, the operation steps of which are as follows:

[0033] The damaged wind power blades are cut into small size blade pieces by a water jet cutting machine, and the small size blade pieces are sent into a shredder for circular shredding. The shredded pieces are passed through a roller screen, the oversize material is sent into the shredder for circular shredding, and the undersize material is sent into a pyrolysis furnace for pyrolysis. The flue gas generated by pyrolysis is sent into an adsorption tower for adsorption, and the slag generated by pyrolysis is collected and mixed into cement raw materials in a certain proportion, and then sent into a rotary kiln for calcination to obtain cement clinker.

[0034] The undersize material of the roller screen is not more than 20mm in size.

[0035] The heat source of the cracking furnace is the flue gas of the three-stage preheater of the cement kiln.

[0036] The temperature of the cracking furnace is controlled at 700℃.

[0037] The pyrolysis time is 3 hours.

[0038] The pyrolysis waste gas is first sent into the adsorption tower, and then into the three-stage air of the cement kiln.

[0039] Adsorption fillers are added to the adsorption tower, and the addition amount is 30% of the volume content of the adsorption tower.

[0040] The adsorption filler is an organometallic material for adsorbing dioxin, and the preparation steps are as follows:

[0041] S1: 800g of iron oxide, 30g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, 3000g of water, control the reaction temperature to be 50℃, react for 3h, filter, dry, and obtain double amino silane treated iron oxide;

[0042] S2: 800 g of diaminosilane treated iron oxide, 20 g of pentaerythritol triacrylate are mixed, 3000 g of DMF, 30 g of sodium methoxide are added, and the reaction is carried out for 0.5 h, 1 g of cerium methacrylate is added, and the reaction is carried out for 1 h, and then filtered, dried, to obtain an organometallic material for adsorbing dioxins;

[0043] S3: mixed with activated carbon, the amount is 0.1% of the mass percentage content of activated carbon, to obtain an adsorption filler.

[0044] When the slag is mixed with cement raw materials, the slag ratio is 10%.

[0045] The calcination temperature of the cement raw materials in the rotary kiln is 1200℃.

[0046] In this embodiment, the concentration of dioxins in the flue gas after adsorption is 0.2 ng TEQ / nm 3 , the adsorption capacity of dioxins in the adsorption material is 94 mg / g, and the removal rate of dioxins is 90.5%.

[0047] Example 2

[0048] A method for co-processing damaged wind power blades in a cement kiln, the operation steps are:

[0049] The damaged wind power blades are cut into small size blade pieces by a water jet cutting machine, and the small size blade pieces are sent into a shredder for circular shredding, and then pass through a drum screen, the oversize material is sent into the shredder for circular shredding, and the undersize material is sent into a pyrolysis furnace for pyrolysis, the flue gas generated by pyrolysis is sent into an adsorption tower for adsorption, and the slag generated by pyrolysis is collected and mixed into cement raw materials in a certain proportion, and then sent into a rotary kiln for calcination to obtain cement clinker.

[0050] The undersize material of the drum screen is not more than 20 mm in size.

[0051] The heat source of the cracking furnace is the flue gas of the three-stage preheater of the cement kiln.

[0052] The temperature of the cracking furnace is controlled at 700℃.

[0053] The pyrolysis time is 2 hours.

[0054] The pyrolysis waste gas first enters the adsorption tower, and then is combined with the tertiary air of the cement kiln.

[0055] The adsorption filler is added to the adsorption tower, and the amount is 35% of the volume content of the adsorption tower.

[0056] The adsorption filler is an organometallic material for adsorbing dioxins, and the preparation steps are as follows:

[0057] S1: 900g of iron oxide, 45g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and 4000g of water were reacted at 60℃ for 2 hours, filtered, and dried to obtain iron oxide treated with bisaminosilane.

[0058] S2: Mix 900g of iron oxide treated with diaminosilane and 35g of pentaerythritol triacrylate, add 4000g of DMF and 45g of sodium methoxide, react for 1.5 hours, add 2g of cerium methacrylate, react for 2 hours, filter, and dry to obtain an organometallic material that adsorbs dioxins.

[0059] S3: Mix with activated carbon, adding 0.3% of the activated carbon by mass, to obtain the adsorption filler.

[0060] When the slag is mixed with cement raw materials, the slag ratio is 12%.

[0061] The cement raw materials are calcined in a rotary kiln at a temperature of 1300℃.

[0062] In this specific implementation scheme, the dioxin concentration in the flue gas after adsorption is 0.1 ng TEQ / nm. 3 The adsorption capacity of the adsorbent material was 112 mg / g, and the dioxin removal rate reached 95.2%.

[0063] Example 3

[0064] A method for co-processing damaged wind turbine blades in a cement kiln, comprising the following steps:

[0065] Damaged wind turbine blades are cut into small blade pieces using a water jet cutter. The small blade pieces are then fed into a shredder for cyclic shredding. The material passing through a drum screen is shredded again in the shredder, while the material passing through the screen is fed into a pyrolysis furnace for pyrolysis. The flue gas generated by pyrolysis is adsorbed in an adsorption tower. The slag generated by pyrolysis is collected and mixed into cement raw materials in a certain proportion. Finally, it is sent to a rotary kiln for calcination to obtain cement clinker.

[0066] The size of the material passing through the drum screen shall not exceed 20mm.

[0067] The heat source for the pyrolysis furnace is the flue gas from the three-stage preheater of the cement kiln.

[0068] The temperature of the pyrolysis furnace is controlled at 750℃.

[0069] The pyrolysis time is 1 hour.

[0070] The pyrolysis waste gas first enters the adsorption tower, and then is incorporated into the tertiary air of the cement kiln.

[0071] The adsorption packing material is added to the adsorption tower, and the amount added is 45% of the volume content of the adsorption tower.

[0072] The adsorption filler is an organometallic material for adsorbing dioxins, and the preparation steps are as follows:

[0073] S1: 1000g of iron oxide, 60g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and 5000g of water were added. The reaction temperature was controlled at 70℃ and the reaction was carried out for 1 hour. The mixture was then filtered and dried to obtain iron oxide treated with bisaminosilane.

[0074] S2: Mix 1000g of iron oxide treated with diaminosilane and 50g of pentaerythritol triacrylate, add 5000g of DMF and 60g of sodium methoxide, react for 2h, add 4g of cerium methacrylate, react for 3h, filter, and dry to obtain an organometallic material that adsorbs dioxins.

[0075] S3: Mix with activated carbon, adding 0.6% of the activated carbon by mass, to obtain the adsorption filler.

[0076] When the slag is mixed with cement raw materials, the slag ratio is 15%.

[0077] The cement raw materials are calcined in a rotary kiln at a temperature of 1400℃.

[0078] In this specific implementation scheme, the dioxin concentration in the flue gas after adsorption is 0.1 ng TEQ / nm. 3 The adsorption capacity of the adsorbent material is 115 mg / g, and the dioxin removal rate reaches 95.2%.

[0079] Comparative Example 1

[0080] A method for co-processing damaged wind turbine blades in a cement kiln, comprising the following steps:

[0081] Damaged wind turbine blades are cut into small blade pieces using a water jet cutter. The small blade pieces are then fed into a shredder for cyclic shredding. The material passing through a drum screen is shredded again in the shredder, while the material passing through the screen is fed into a pyrolysis furnace for pyrolysis. The flue gas generated by pyrolysis is adsorbed in an adsorption tower. The slag generated by pyrolysis is collected and mixed into cement raw materials in a certain proportion. Finally, it is sent to a rotary kiln for calcination to obtain cement clinker.

[0082] The size of the material passing through the drum screen shall not exceed 20mm.

[0083] The heat source for the pyrolysis furnace is the flue gas from the three-stage preheater of the cement kiln.

[0084] The temperature of the pyrolysis furnace is controlled at 700℃.

[0085] The pyrolysis time is 3 hours.

[0086] The pyrolysis waste gas first enters the adsorption tower, and then is incorporated into the tertiary air of the cement kiln.

[0087] The adsorption packing material is added to the adsorption tower at a volume of 30%.

[0088] The adsorption filler is activated carbon.

[0089] When the slag is mixed with cement raw materials, the slag ratio is 10%.

[0090] The cement raw materials are calcined in a rotary kiln at a temperature of 1200℃.

[0091] In this specific implementation scheme, the dioxin concentration in the flue gas after adsorption is 1.5 ng TEQ / nm. 3 The dioxin adsorption capacity of the adsorbent material was 41 mg / g, and the dioxin removal rate was 28.6%.

[0092] Comparative Example 2

[0093] A method for co-processing damaged wind turbine blades in a cement kiln, comprising the following steps:

[0094] Damaged wind turbine blades are cut into small blade pieces using a water jet cutter. The small blade pieces are then fed into a shredder for cyclic shredding. The material passing through a drum screen is shredded again in the shredder, while the material passing through the screen is fed into a pyrolysis furnace for pyrolysis. The flue gas generated by pyrolysis is adsorbed in an adsorption tower. The slag generated by pyrolysis is collected and mixed into cement raw materials in a certain proportion. Finally, it is sent to a rotary kiln for calcination to obtain cement clinker.

[0095] The size of the material passing through the drum screen shall not exceed 20mm.

[0096] The heat source for the pyrolysis furnace is the flue gas from the three-stage preheater of the cement kiln.

[0097] The temperature of the pyrolysis furnace is controlled at 700℃.

[0098] The pyrolysis time is 3 hours.

[0099] The pyrolysis waste gas first enters the adsorption tower, and then is incorporated into the tertiary air of the cement kiln.

[0100] The adsorption packing material is added to the adsorption tower at a volume of 30%.

[0101] The adsorption filler is an organometallic material for adsorbing dioxins, and the preparation steps are as follows:

[0102] S1: 800g of iron oxide, 30g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and 3000g of water were reacted at 50℃ for 3 hours. The mixture was then filtered and dried to obtain iron oxide treated with bisaminosilane.

[0103] S2: Mix 800g of iron oxide treated with diaminosilane, 20g of pentaerythritol triacrylate, add 3000g of DMF and 30g of sodium methoxide, react for 1.5h, filter, and dry to obtain an organometallic material that adsorbs dioxins.

[0104] S3: Mix with activated carbon, adding 0.1% of the activated carbon by mass, to obtain the adsorption filler.

[0105] When the slag is mixed with cement raw materials, the slag ratio is 10%.

[0106] The cement raw materials are calcined in a rotary kiln at a temperature of 1200℃.

[0107] In this specific implementation scheme, the dioxin concentration in the flue gas after adsorption is 0.6 ng TEQ / nm. 3 The adsorption capacity of the adsorbent material was 80 mg / g, and the dioxin removal rate was 71.4%.

[0108] Comparative Example 3

[0109] A method for co-processing damaged wind turbine blades in a cement kiln, comprising the following steps:

[0110] Damaged wind turbine blades are cut into small blade pieces using a water jet cutter. The small blade pieces are then fed into a shredder for cyclic shredding. The material passing through a drum screen is shredded again in the shredder, while the material passing through the screen is fed into a pyrolysis furnace for pyrolysis. The flue gas generated by pyrolysis is adsorbed in an adsorption tower. The slag generated by pyrolysis is collected and mixed into cement raw materials in a certain proportion. Finally, it is sent to a rotary kiln for calcination to obtain cement clinker.

[0111] The size of the material passing through the drum screen shall not exceed 20mm.

[0112] The heat source for the pyrolysis furnace is the flue gas from the three-stage preheater of the cement kiln.

[0113] The temperature of the pyrolysis furnace is controlled at 700℃.

[0114] The pyrolysis time is 3 hours.

[0115] The pyrolysis waste gas first enters the adsorption tower, and then is incorporated into the tertiary air of the cement kiln.

[0116] The adsorption packing material is added to the adsorption tower at a volume of 30%.

[0117] The adsorption filler is an organometallic material for adsorbing dioxins, and the preparation steps are as follows:

[0118] S1: 800g of iron oxide, 30g of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, and 3000g of water were reacted at 50℃ for 3 hours. The mixture was then filtered and dried to obtain iron oxide treated with bisaminosilane.

[0119] S2: Add 3000g of DMF and 30g of sodium methoxide to 800g of iron oxide treated with diaminosilane, react for 0.5h, add 1g of cerium methacrylate, react for 1h, filter, and dry to obtain an organometallic material that adsorbs dioxins.

[0120] S3: Mix with activated carbon, adding 0.1% of the activated carbon by mass, to obtain the adsorption filler.

[0121] When the slag is mixed with cement raw materials, the slag ratio is 10%.

[0122] The cement raw materials are calcined in a rotary kiln at a temperature of 1200℃.

[0123] In this specific implementation scheme, the dioxin concentration in the flue gas after adsorption is 0.7 ng TEQ / nm. 3 The adsorption capacity of the adsorbent material was 72 mg / g, and the dioxin removal rate was 66.7%.

[0124] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A method for co-processing damaged wind power blades in a cement kiln, the operating steps of which are as follows: The damaged wind power blades are cut into small-sized blade pieces by a water jet cutter, and the small-sized blade pieces are sent to a shredder for cyclic shredding, and then pass through a drum screen, the oversize material is sent to the shredder for cyclic shredding, and the undersize material is sent to a pyrolysis furnace for pyrolysis, the flue gas generated by pyrolysis is sent to an adsorption tower for adsorption, and the slag generated by pyrolysis is collected and mixed into cement raw materials in a certain proportion, and then sent to a rotary kiln for calcination to obtain cement clinker. The adsorption tower is added with adsorption filler, and the addition amount is 30-45% of the volume content of the adsorption tower. The adsorption filler is an organic metal material for adsorbing dioxin, and the preparation steps are as follows: S1: 80-100 parts of iron oxide, 3-6 parts of 1,3-bis(3-aminopropyl)-1,1,3,3-tetramethyldisiloxane, 300-500 parts of water, and the reaction temperature is controlled at 50-70℃, and the reaction is carried out for 1-3h, then filtered, dried, and the double amino silane treated iron oxide is obtained; S2: 80-100 parts of double amino silane treated iron oxide, 2-5 parts of pentaerythritol triacrylate, 300-500 parts of DMF, 3-6 parts of sodium methoxide, and the reaction is carried out for 0.5-2h, then 0.05-0.4 parts of cerium methacrylate is added, and the reaction is carried out for 1-3h, then filtered, dried, and the organic metal material for adsorbing dioxin is obtained; S3: mixed with activated carbon, and the addition amount is 0.1-0.6% of the mass percentage content of activated carbon, and the adsorption filler is obtained.

2. A method of cement kiln co-processing of wind turbine broken blades according to claim 1, characterized in that: The undersize material of the drum screen is not more than 20mm in size.

3. A method of cement kiln co-processing of wind turbine broken blades according to claim 1, characterized in that: The heat source of the pyrolysis furnace is the flue gas of the three-stage preheater of the cement kiln.

4. A method of cement kiln co-processing of wind turbine broken blades according to claim 1, characterized in that: The temperature of the pyrolysis furnace is controlled at 700-750℃.

5. A method of cement kiln co-processing of windmill broken blades according to claim 1, characterized in that: The pyrolysis time is 1-3 hours.

6. A method of cement kiln co-processing of wind power generation damaged blades as claimed in claim 1 wherein: The flue gas generated by pyrolysis is first sent to the adsorption tower, and then combined with the three-stage air of the cement kiln.

7. A method of cement kiln co-processing of windmill broken blades according to claim 1, characterized in that: When the slag is mixed with the cement raw materials, the slag ratio is 10-15%.

8. A method of cement kiln co-processing of wind power generation damaged blades as claimed in claim 1 wherein: The calcination temperature of the cement raw materials in the rotary kiln is 1200-1400℃.