Cement raw material for retired wind power blade as well as preparation method and application of cement raw material

Abstract

The invention provides an ex-service wind turbine blade cement raw material as well as a preparation method and application thereof. The method comprises the following steps: crushing the retired wind turbine blade; burning the crushed retired wind turbine blade to obtain retired wind turbine blade ash; the limestone, the clay and the iron raw materials are crushed; determining the ratio of various raw materials according to a preset rate value; preparing the retired wind power blade ash, the crushed limestone, the clay and the iron raw material into a mixture according to the proportion; and grinding and homogenizing the mixture to obtain the cement raw material. The technical problem to be solved is how to prepare the cement raw material, so that the cement raw material with good comprehensive performance can be prepared by effectively utilizing solid waste raw materials such as decommissioned wind power blades to replace part of raw materials, the production cost of cement enterprises is reduced, meanwhile, the problem of land occupation pollution of peripheral decommissioned wind power blades is solved, and the cement raw material has obvious environmental protection benefits. Therefore, the device is more practical.

Description

Technical Field

[0001] The present invention relates to the technical field of cement production and manufacturing, and in particular to a cement raw material for retired wind turbine blades, and a preparation method and application thereof. Background Art

[0002] With the rapid increase in the number of retired wind turbine blades in my country, a series of environmental problems have been caused. However, in the existing technology, retired wind turbine blades are mostly treated by incineration, landfill and other treatment methods. Only a few reports can crush retired wind turbine blades and add them to concrete as additives for digestion and application. However, there are the following disadvantages in crushing retired wind turbine blades and adding them to concrete as additives: First, it is difficult to evenly disperse the fragments of retired wind turbine blades in concrete, and they are easy to agglomerate, resulting in uneven concrete performance; second, the interface bonding between retired wind turbine blades and concrete matrix may not be ideal, affecting stress transfer and reducing the reinforcement effect; third, the retired wind turbine blades make it more difficult to control the quality of concrete due to differences in fragment performance and addition amount. Summary of the invention

[0003] The main purpose of the present invention is to provide a cement raw material for retired wind turbine blades and a preparation method and application thereof. The technical problem to be solved is how to prepare a cement raw material so that it can effectively utilize solid waste raw materials such as retired wind turbine blades to replace part of the raw materials to prepare cement raw material with good comprehensive performance, thereby reducing the production cost of cement enterprises and solving the pollution problem of land occupation caused by retired wind turbine blades in the surrounding area. It has obvious environmental benefits and is therefore more suitable for practical use.

[0004] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions. A method for preparing cement raw material of retired wind turbine blades proposed in the present invention comprises the following steps:

[0005] S11: crushing retired wind turbine blades; incinerating the crushed retired wind turbine blades to obtain retired wind turbine blade ash; crushing limestone, clay and iron raw materials;

[0006] S12 determines the proportion of various raw materials according to the preset ratio value;

[0007] S13 prepares a mixture of retired wind turbine blade ash, crushed limestone, clay and iron raw materials according to a proportion;

[0008] The S14 mixture is ground and homogenized to obtain cement raw material.

[0009] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0010] Preferably, the aforementioned preparation method further comprises the following steps before the retired wind turbine blades are crushed:

[0011] S21 Disassemble retired wind turbine blades and take out the blade matrix containing resin and glass fiber;

[0012] S22: cutting the blade substrate into small pieces and then crushing them.

[0013] Preferably, in the aforementioned preparation method, the particle size of the retired wind turbine blades after crushing is less than 80 μm; and the particle size of the material after grinding is less than 80 μm.

[0014] Preferably, in the aforementioned preparation method, the flue gas generated by incineration of the crushed retired wind turbine blades is used to provide heat for decomposition of CaCO3 in the decomposition furnace.

[0015] Preferably, the aforementioned preparation method further comprises the step of performing chemical composition analysis on the retired wind turbine blade ash before determining the ratio of various raw materials according to preset rate values.

[0016] Preferably, in the aforementioned preparation method, the ratio of the various raw materials is obtained by performing four arithmetic operations based on the chemical composition analysis results of the retired wind turbine blade ash, limestone, clay and iron raw materials and the preset rate values.

[0017] Preferably, in the aforementioned preparation method, the cement raw material includes, by mass percentage, 84-86% limestone, 9-13% clay, 1.5-2.5% iron raw materials, and 0.1-3.5% retired wind turbine blade ash; the sum of the limestone, clay, iron raw materials and retired wind turbine blade ash is 100%.

[0018] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions: A cement raw material of retired wind turbine blades proposed in the present invention comprises retired wind turbine blade ash.

[0019] The purpose of the present invention and the solution to its technical problems can be further achieved by adopting the following technical measures.

[0020] Preferably, the aforementioned retired wind turbine blade cement raw material is prepared according to the aforementioned preparation method.

[0021] The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions: According to the present invention, a cement raw material based on the retired wind turbine blades mentioned above is used in the field of cement manufacturing.

[0022] By means of the above technical solution, the present invention provides a cement raw material for retired wind turbine blades and a preparation method and application thereof, which have at least the following advantages:

[0023] The cement raw meal and its preparation method and application proposed in the present invention are as follows: retired wind turbine blades are crushed and then incinerated to form retired wind turbine blade ash; the retired wind turbine blade ash is then used as a raw material and mixed with traditional raw materials to prepare cement raw meal; the present invention reuses retired wind turbine blades after incineration into ash, on the one hand, the inorganic components contained in the retired wind turbine blades can be effectively utilized in cement production and become part of cement minerals; on the other hand, the high temperature environment in the cement production process can decompose some organic matter in the retired wind turbine blades, thereby reducing their potential adverse effects on the quality of the final product. In the prior art, cement raw materials are generally prepared using four groups of materials: limestone, silicon, aluminum, and iron. The present invention improves the formula by adding retired wind turbine blade powder to replace part of the limestone, silicon, and aluminum. Among them, retired wind turbine blade powder can replace part of the limestone, which can reduce carbon emissions in the subsequent decomposition process. Retired wind turbine blade powder can also replace part of the silicon and aluminum materials, reducing the amount of silicon and aluminum materials, and reducing the manufacturing cost of cement materials. At the same time, the technical solution of the present invention can also effectively solve the pollution problem of the surrounding retired wind turbine blades, and will not cause new pollution or create new pollution sources, and has obvious environmental benefits. The technical solution of the present invention has opened up a new path for the comprehensive utilization of retired wind turbine blades. According to the cement raw materials formulated according to the present invention, the actual rate value of the cement clinker obtained after firing can be controlled within a reasonable range of the target rate value, and the chemical and physical properties of the cement clinker do not change significantly before and after the addition of retired wind turbine blade powder; that is, the digestion and utilization of retired wind turbine blade powder will not bring harm to the chemical and physical properties of the cement clinker, and can meet the daily production of cement enterprises.

[0024] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail as follows. DETAILED DESCRIPTION

[0025] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of a cement raw material for retired wind turbine blades and its preparation method and its specific implementation method, structure, characteristics and effects proposed by the present invention in combination with the preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0026] The present invention proposes a retired wind turbine blade cement raw material and a preparation method thereof. In addition to traditional raw materials, the cement raw material also introduces retired wind turbine blade ash as a raw material. On the one hand, the inorganic components contained in the retired wind turbine blades can be effectively utilized in cement production and become a part of cement minerals; on the other hand, the high temperature environment in the cement production process can decompose some organic matter in the retired wind turbine blades, thereby reducing its potential adverse effects on the quality of the final product.

[0027] Traditional raw materials in cement raw materials include a four-component material system of limestone, silicon material, aluminum material, and iron material; the present invention improves the formula by adding retired wind turbine blade powder; wherein, retired wind turbine blade powder can replace part of the limestone material, and can reduce carbon emissions in subsequent decomposition processes; retired wind turbine blade powder can also replace part of the silicon material and aluminum material, reduce the amount of silicon material and aluminum material therein, and reduce the manufacturing cost of cement materials; at the same time, the technical solution of the present invention can also effectively solve the pollution problem of land occupation caused by retired wind turbine blades in the surrounding area, and will not cause new pollution or create new pollution sources, and has obvious environmental benefits.

[0028] The method mainly comprises the following steps: firstly, the retired wind turbine blades are crushed, the crushed retired wind turbine blades are burned to obtain retired wind turbine blade ash; and limestone, clay and iron raw materials are crushed.

[0029] For retired wind turbine blades, since retired wind turbine blades include materials such as wood, foam, and metal parts in addition to resin materials containing glass fibers such as blades, in order to effectively utilize them, the present invention preferably splits and sorts them before crushing them, removes the filling materials therein, and only retains the blade matrix part containing resin and glass fibers; then cuts them into small pieces by a cutting machine, and then crushes the small pieces by a crusher; in order to facilitate their incineration, the present invention preferably crushes them into powder with a particle size less than <80μm.

[0030] A large amount of hot flue gas will be generated when the crushed retired wind turbine blades are incinerated. In order to better utilize the heat in the flue gas, the present invention preferably passes the hot flue gas generated by the incineration into a cement-burning decomposition furnace, and uses it for heating the decomposition of CaCO3 in the decomposition furnace, thereby utilizing the waste heat and saving energy.

[0031] The crushing of limestone, clay and iron raw materials can be carried out according to conventional means in the art, and the present invention does not specifically limit it, as long as it can be smoothly ground in the subsequent grinding process. In a specific embodiment of the present invention, the preparation of limestone material is to put the limestone raw material into a crusher for crushing, and after the crushing is completed, it enters the homogenization pile through a transfer bin for homogenization treatment; after the homogenization treatment is completed, the obtained material is stored in a limestone warehouse for standby; the preparation of clay material is to put the clay raw material into a crusher for crushing, and after the crushing is completed, it enters the homogenization pile through a transfer bin for homogenization treatment to obtain clay material; the preparation of iron material is to put the iron raw material into a crusher for crushing, and after the crushing is completed, it enters the homogenization pile through a transfer bin for homogenization treatment to obtain iron material.

[0032] The second step is to analyze the chemical composition of the retired wind turbine blade ash, limestone, clay and iron raw materials. This step is preferred. If the chemical composition of this batch of raw materials or a certain raw material is known, this step can be omitted. The technical purpose of analyzing the chemical composition is to accurately design the proportion of cement raw materials in the future, so as to better control the rate value of cement clinker obtained by burning the cement raw materials, thereby controlling the performance of the finished product.

[0033] The chemical composition analysis of limestone, clay, iron raw materials, etc. can be carried out by conventional means in the art, and the present invention does not impose any specific limitation thereto, as long as the oxide composition of various raw materials can be accurately understood.

[0034] The steps for chemical composition analysis of retired wind turbine blades are as follows: first, disassemble and decompose them to retain the blade matrix part containing resin and glass fiber; then use a cutter to cut them into small pieces, and then use a crusher to crush them, and then send the crushed retired wind turbine blades into a fluidized bed waste incinerator for combustion to obtain the treated retired wind turbine blade ash; then, use conventional means in the field to test the composition of the retired wind turbine blade ash.

[0035] The third step is to determine the ratio of various raw materials according to the preset rate values.

[0036] The preset rate value is set based on the product performance of the target cement raw material and the composition of the above raw materials. Based on a large number of experimental tests and industry experience, the preferred preset rate values ​​of the present invention are as follows: SM is 2.4-2.6, KH is 0.85, and IM is 1.4; this rate value is calculated based on the calcined composition after the cement raw material of the present invention is burned into cement clinker; this range of preset rate values ​​can ensure that the strength, consistency, fluidity, setting time, etc. of the cement clinker burned from the cement raw material are all within a reasonable range. In the above technical scheme, the preset rate values ​​of cement all adopt the customary meaning in the art, and are calculated based on the calcined basis after being burned. In a specific embodiment of the present invention, the composition of the raw materials is shown in Table 1 below, and the units are all mass percentages:

[0037] Table 1

[0038] <![CDATA[SiO2]]> <![CDATA[Al2O3]]> MgO CaO <![CDATA[TiO2]]> <![CDATA[Fe2O3]]> <![CDATA[Na2O]]> other loss total Wind turbine blade ash 56.57 22.30 12.11 6.41 0.64 0.63 0.62 -- 0.72 100 limestone 7.5 1.5 1.1 50.23 -- 0.59 -- -- 39.08 100 clay 68.72 16.87 0.83 1.44 -- 5.46 -- -- 6.68 100 Aluminum raw materials 13.45 63.77 1.66 2.87 -- 16.35 -- 0.92 0.98 100 Iron raw materials 21.4 4.96 2.36 5.51 -- 61.64 -- 0.91 3.22 100

[0039] According to the ratio calculation of the raw materials with the above chemical composition, the ratio of the above raw materials is as follows in terms of mass percentage: limestone 84-86%, clay 9-13%, iron raw materials 1.5-2.5%, retired wind turbine blade ash 0.1-3.5%, and the total amount of limestone, clay, iron raw materials and retired wind turbine blade ash is 100%.

[0040] The ratio of various raw materials in the technical solution of the present invention is preferably obtained by performing four arithmetic operations based on the chemical composition analysis results of retired wind turbine blade ash, limestone, clay and iron raw materials, and preset rate values; it can also be calculated based on statistical analysis of data from a large number of experimental tests or by assigning an empirical formula based on the professional experience of technical personnel.

[0041] The cement raw material prepared according to the ratio of the above raw materials is fired into cement clinker according to the conventional method, and the cement clinker after grinding can reach a 3d flexural strength of more than 2.8MPa; a 3d compressive strength of more than 16.6MPa; a 28d flexural strength of more than 6.0MPa; and a 28d compressive strength of more than 36.7MPa.

[0042] The ratio of the above raw materials will change with the change of the chemical composition of the raw materials. The above preferred ratio is designed based on the chemical composition of the raw materials shown in Table 1. The ratio design of the raw materials in the present invention is mainly carried out by controlling its ratio value within a preset ratio value range.

[0043] The fourth step is to prepare the mixture. This step can be carried out by conventional means in the art, and the present invention does not specifically limit it, as long as the ingredients can be accurately prepared. In a specific embodiment of the present invention, the speed of the conveyor belt scale is adjusted by the central control microcomputer, and the retired wind turbine blade ash, limestone crushed material, clay crushed material, and iron raw material crushed material are transported by the conveyor belt scale, and the raw materials in the formula amount are evenly mixed to obtain a mixture.

[0044] The fifth step is to grind the above-mentioned mixture into a grinding raw material. The grinding of the mixture can be carried out by conventional means in the art, and the present invention does not specifically limit it, as long as the mixture can be ground to a certain particle size. In order to be effectively controlled in the subsequent process, the present invention preferably grinds it into a grinding raw material with a particle size of less than 80 μm.

[0045] The sixth step is to homogenize the raw material to obtain cement raw material. The raw material homogenization can be carried out by conventional means in the art, and the present invention does not specifically limit it. In a specific embodiment of the present invention, the ground raw material is sent to the raw material homogenization bin by a storage elevator for homogenization to obtain cement raw material.

[0046] The present invention also proposes a retired wind turbine blade cement raw material, which includes retired wind turbine blade ash. By introducing retired wind turbine blade ash into cement raw material, the present invention can effectively utilize the inorganic components contained in retired wind turbine blades in cement production and become part of cement minerals; on the other hand, the high temperature environment in the cement production process can decompose some organic matter in retired wind turbine blades, which can reduce their potential adverse effects on the quality of the final product; the added retired wind turbine blade powder can replace part of the limestone material, thereby reducing carbon emissions in the subsequent decomposition process; and the added retired wind turbine blade powder can also replace part of the silicon material and aluminum material, reduce the amount of silicon material and aluminum material, and reduce the manufacturing cost of cement materials; at the same time, the technical solution of the present invention can also effectively solve the pollution problem of land occupation caused by retired wind turbine blades in the surrounding area, and has obvious environmental benefits. After adding retired wind turbine blade ash in the technical solution of the present invention, the chemical and physical properties of the prepared cement raw material after being fired into cement clinker do not change significantly compared with the cement to which the retired wind turbine blade ash is not added; that is, the digestion and utilization of retired wind turbine blade powder will not harm the chemical and physical properties of the cement clinker fired therefrom, and can meet the daily production of cement companies.

[0047] The above-mentioned cement raw material is prepared according to the above-mentioned preparation method. The cement clinker obtained by burning the cement raw material prepared by the technical solution of the present invention has a sieve residue of less than 2.3% on a 80 μm square hole sieve.

[0048] The present invention also proposes an application of the aforementioned retired wind turbine blade cement raw material in the field of cement manufacturing.

[0049] The present invention will be further described below in conjunction with specific embodiments, but this should not be construed as limiting the scope of protection of the present invention. Some non-essential improvements and adjustments made to the present invention by technicians in this field based on the above-mentioned contents of the present invention still fall within the scope of protection of the present invention.

[0050] Unless otherwise specified, the materials, reagents, etc. involved below are all commercially available products well known to those skilled in the art; unless otherwise specified, the methods described are all methods well known in the art. Unless otherwise defined, the technical terms or scientific terms used should have the common meanings understood by ordinary technicians in the field to which the present invention belongs.

[0051] Example 1

[0052] This embodiment prepares a cement raw material, wherein the chemical composition of the raw materials used in this embodiment is shown in Table 1. The specific steps are as follows:

[0053] 1) Treatment of retired wind turbine blades: First, the retired wind turbine blades are disassembled and decomposed, and the blade matrix containing resin and glass fiber is retained; the blade matrix is ​​first cut into small pieces by a cutting machine, and then crushed into powder with a particle size of 80μm by a crusher; the crushed retired wind turbine blade powder is sent to a fluidized bed incinerator for combustion to obtain the treated retired wind turbine blade ash for standby use.

[0054] 2) Limestone, clay and iron raw materials are respectively put into the crusher for crushing, and after crushing, they are passed through the transfer bin and then enter the homogenization pile for homogenization treatment; after the homogenization treatment, limestone, clay and iron raw materials are respectively obtained.

[0055] 3) The ingredients are prepared in the proportions of 85.25 wt% of limestone, 9.81% of clay, 1.86 wt% of iron material and 3.08 wt% of retired wind turbine blade ash.

[0056] 4) The speed of the conveyor belt scale is adjusted by the central control microcomputer, and the limestone material, clay material, iron material and retired wind turbine blade ash are transported by the conveyor belt scale to mix the four raw materials in the formula amount evenly to obtain a mixture.

[0057] 5) The mixed material is fed into the raw material mill for grinding. The particle size of the raw material after grinding should be less than 80μm.

[0058] 6) After grinding, the ground raw material is sent to the raw material homogenization warehouse through the warehouse elevator for homogenization to obtain cement raw material.

[0059] The cement raw material prepared in this example was fired into cement clinker according to a conventional laboratory method, and then the cement clinker was ground and then subjected to quality inspection. The results are shown in Table 2.

[0060] Embodiments 2 to 6

[0061] The same as Example 1, except that the ratio of the raw materials is different, as shown in Table 2. The test results are shown in Table 2.

[0062] Comparative Example

[0063] The same as Example 1, except that retired wind turbine blade ash is not added, and the raw material ratio is shown in Table 2. The test results of the cement clinker fired by this comparative example are shown in Table 2.

[0064] Table 2

[0065]

[0066]

[0067] It can be seen from the material ratios and performance test results shown in Table 2 that in each embodiment, the physical and chemical properties of the cement clinker, such as strength, consistency, fluidity, setting time, etc., are within a reasonable range and can meet the daily production of cement enterprises.

[0068] It can be seen from the material ratios and performance test results shown in Table 2 that in Example 1 and the comparative example, the physical and chemical properties after being fired into cement clinker, such as strength, consistency, fluidity and setting time, are basically the same, that is, adding some retired wind turbine blade ash to the cement raw material will not have a significant impact on its chemical and physical properties.

[0069] The technical features in the claims and / or the specification of the present invention may be combined, and the combination is not limited to the combination obtained by reference in the claims. The technical solution obtained by combining the technical features in the claims and / or the specification is also within the protection scope of the present invention.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing cement raw material of retired wind turbine blades, characterized in that: It includes the following steps: S11: crushing the retired wind turbine blades; incinerating the crushed retired wind turbine blades to obtain retired wind turbine blade ash; crushing limestone, clay and iron raw materials; S12 determines the proportion of various raw materials according to the preset ratio value; S13 prepares a mixture of retired wind turbine blade ash, crushed limestone, clay and iron raw materials according to a proportion; The S14 mixture is ground and homogenized to obtain cement raw material.

2. The preparation method according to claim 1, characterized in that: The decommissioned wind turbine blades may also be crushed before the following steps are included: S21 Disassemble retired wind turbine blades and take out the blade matrix containing resin and glass fiber; S22: cutting the blade substrate into small pieces and then crushing them.

3. The preparation method according to claim 1, characterized in that: The particle size of the retired wind turbine blades after crushing is less than 80 μm; the particle size of the material after grinding is less than 80 μm.

4. The preparation method according to claim 1, characterized in that: The flue gas generated by the incineration of the crushed retired wind turbine blades is used to provide heat for the decomposition of CaCO3 in the decomposition furnace.

5. The preparation method according to claim 1, characterized in that: Before determining the ratio of various raw materials according to the preset rate values, the method also includes a step of analyzing the chemical composition of the retired wind turbine blade ash.

6. The preparation method according to claim 5, characterized in that: The ratio of the various raw materials is obtained by performing four arithmetic operations based on the chemical composition analysis results of the retired wind turbine blade ash, limestone, clay and iron raw materials and the preset rate values.

7. The preparation method according to claim 1, characterized in that: Calculated by mass percentage, the cement raw material includes: 84-86% limestone, 9-13% clay, 1.5-2.5% iron raw materials, and 0.1-3.5% retired wind turbine blade ash; the sum of the limestone, clay, iron raw materials and retired wind turbine blade ash is 100%.

8. A cement raw material for retired wind turbine blades, characterized in that: It includes ash from retired wind turbine blades.

9. The cement raw material for retired wind turbine blades according to claim 8, characterized in that: It is prepared according to the preparation method according to any one of claims 1 to 7.

10. Use of the cement raw material of retired wind turbine blades according to claim 8 or 9 in the field of cement manufacturing.

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