Anti-corrosion target region wear-resistant refractory material as well as preparation method and application thereof
By using a combination of laminated plastic layers and coatings in the target area of the circulating fluidized bed boiler separator, the problem of insufficient wear resistance and corrosion resistance is solved, high wear resistance and corrosion resistance of the material are achieved, the service life is extended and the engineering cost is reduced.
Patent Information
- Application Number
- CN202511068106.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-31
- Publication Date
- 2025-10-17
AI Technical Summary
The refractory materials in the target area of the separator of a circulating fluidized bed boiler are prone to wear and corrosion in a high-temperature and high-dust environment. Existing technologies make it difficult to simultaneously improve both wear resistance and corrosion resistance, resulting in rapid material damage and affecting boiler operation stability.
The plastic layer and coating are stacked. The coating is composed of aluminum oxide, chromium ore and silicon carbide, and is combined with a coagulant to enhance the bonding strength. The coating is embedded in the pores of the plastic layer to seal the pores, forming a dense layer to improve wear resistance and corrosion resistance.
It significantly improves the surface strength and corrosion resistance of the target area material, extends service life, reduces project costs, reduces wear and corrosion, and improves separator efficiency.
Smart Images
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Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of wear protection of circulating fluidized bed boilers, and particularly relates to an anti-corrosion target area wear-resistant refractory material and a preparation method and application thereof. BACKGROUND
[0002] The circulating fluidized bed boiler has a great advantage in clean combustion due to its economic and reasonable use of low-quality coal, and is currently developing rapidly. The separator is an important component for completing material circulation of the circulating fluidized bed boiler. Since the flue gas speed in the separator is high (20 m / s-30 m / s), the ash particle concentration is large (5 kg / m 3 3 ), the movement in the separator belongs to complex gas-solid two-phase flow, and the working environment of the separator is harsh, and the wear-resistant refractory material is generally laid.
[0003] The target area is the main impact area when the high-dust gas flow is sharply rotated in the separator, and is not only the area where the particles first impact the separator wall, but also the area where the gas flow has the highest speed and exists sharp turning, which aggravates the wear of the target area refractory material. With the wide use of selective non-catalytic reduction (SNCR) technology, the products generated in the SNCR reaction process, such as ammonium bisulfate and ammonium sulfate (NH4HSO4 and (NH4)2SO4), have strong corrosive and sticky properties, accelerate the chemical corrosion of the target area refractory material, and cause the decrease of the relevant indexes of the material, especially when the urea reducing agent is unevenly or excessively sprayed, the chemical corrosion in the local area will be more serious; and the precipitation and formation of these products can cause uneven temperature change of the surface and the inside of the target area refractory material, thereby increasing the thermal stress of the material, causing cracks, peeling or performance degradation of the refractory material.
[0004] In China, most of the circulating fluidized bed boilers have encountered different degrees of target area refractory wear and peeling problems. According to data statistics, about half of the separator failures are caused by damage of the wear-resistant refractory material, and further cause unplanned shutdown of the unit. This also puts forward higher requirements for the wear resistance, corrosion resistance and thermal stress bearing capacity of the target area refractory material.
[0005] The prior art has taken technical measures such as setting a boss, adopting a patty structure, adding a layer of refractory material at the inlet of the cyclone separator, and increasing the thickness of the wear-resistant refractory material layer in the target area to prolong the service life of the refractory material in the target area. There are also new materials for wear protection. However, the running results show that the technical measures such as setting a boss, adopting a patty structure, and adding a layer of refractory material have reduced the wear of the target area, but have changed the flow of the dust-containing gas in the separator cylinder, destroyed the flow field, caused the efficiency of the separator to decrease, and still have the problem of the falling of the wear-resistant lining. Increasing the thickness of the wear-resistant refractory material layer also brings new problems of construction, fixation, and maintenance. The existing wear-resistant new materials mainly start from hardness, and have insufficient corrosion resistance, which cannot cope with the corrosion of ammonium bisulfate and ammonium sulfate (NH4HSO4 and (NH4)2SO4). SUMMARY
[0006] The present application aims to at least partially solve one of the technical problems in the related art. To this end, the present application provides an anti-corrosion target area wear-resistant refractory material and a preparation method and application thereof. The anti-corrosion target area wear-resistant refractory material has good wear resistance, corrosion resistance, and thermal shock resistance, can greatly improve the surface strength and corrosion resistance of the circulating fluidized bed target area material, avoid corrosion caused by ammonium bisulfate generated after SNCR denitration, and damage to the target area caused by thermal stress changes.
[0007] To this end, the first aspect of the present application provides an anti-corrosion target area wear-resistant refractory material, which comprises a plastic layer and a coating layer arranged in layers.
[0008] The raw materials for preparing the plastic layer include alumina, zircon sand, chrome sand, silicon carbide, and kaolin, wherein the content of each component is: 60wt%-70wt% of alumina, 5wt%-10wt% of zircon sand, 5wt%-15wt% of chrome sand, 5wt%-15wt% of silicon carbide, and 5wt%-10wt% of kaolin.
[0009] The raw materials for preparing the coating layer include alumina, chrome sand, and silicon carbide, wherein the content of each component is: 60wt%-75wt% of alumina, 10wt%-20wt% of chrome sand, and 10wt%-20wt% of silicon carbide.
[0010] The anti-corrosion target area wear-resistant refractory material provided by the present application has good wear resistance, corrosion resistance, and thermal shock resistance, and has a long service life and low engineering cost.
[0011] According to the embodiment of the present application, the chemical composition of the coating layer has Al2O3≥80wt%, Fe2O3≤1.0wt%, and SiC≥10wt%.
[0012] According to an embodiment of the present application, the coating layer has a refractoriness of ≥1800℃, a bulk density of 2.8g / cm 3 ~3.5g / cm 3 , and a porosity of 13%~18%.
[0013] According to an embodiment of the present application, the coating layer has an average particle size of 0.5mm~2mm, wherein the proportion of particles with a particle size of ≤1mm is >75wt%.
[0014] According to an embodiment of the present application, the raw material for preparing the coating layer further comprises a coagulation accelerator.
[0015] According to an embodiment of the present application, the content of the coagulation accelerator in the coating layer is 0.2wt%~1.0wt%.
[0016] According to an embodiment of the present application, the coagulation accelerator comprises sodium fluosilicate.
[0017] According to an embodiment of the present application, the chemical composition of the plastic layer comprises Al2O3≥80wt%, Fe2O3≤1.0wt%, and SiC≥10wt%.
[0018] According to an embodiment of the present application, the plastic layer has a refractoriness of ≥1800℃, a bulk density of 2.6g / cm 3 ~3.2g / cm 3 , and a porosity of 15%~20%.
[0019] According to an embodiment of the present application, the plastic layer has an average particle size of 0.5mm~3mm, wherein the proportion of particles with a particle size of ≤1mm is >60wt%.
[0020] According to an embodiment of the present application, the raw material for preparing the plastic layer further comprises a heat-conducting filler.
[0021] According to an embodiment of the present application, the content of the heat-conducting filler in the plastic layer is 2wt%~4wt%.
[0022] According to an embodiment of the present application, the heat-conducting filler comprises boron nitride.
[0023] According to an embodiment of the present application, the plastic layer has a thermal conductivity of 5W / (m·K)~15W / (m·K) at 1000℃.
[0024] According to an embodiment of the present application, the plastic layer has a pH value of 4~6.
[0025] According to an embodiment of the present application, the raw material for preparing the plastic layer further comprises a binder.
[0026] According to an embodiment of the present application, the content of the adhesive in the plasticable layer is 5wt%-10wt%.
[0027] According to an embodiment of the present application, the adhesive comprises phosphoric acid.
[0028] According to an embodiment of the present application, the surface of the plasticable layer comprises protrusions and grooves, and the height difference between the protrusions and the grooves is 10mm-30mm.
[0029] The second aspect of the present application provides a preparation method of the anti-corrosion target area wear-resistant refractory material of the first aspect, and the preparation method comprises the following steps:
[0030] The plasticable layer is laid on the target area part, and a coating is coated on the plasticable layer to obtain the anti-corrosion target area wear-resistant refractory material.
[0031] The anti-corrosion target area wear-resistant refractory material can be prepared by using the preparation method provided by the present application, and the anti-corrosion target area wear-resistant refractory material has strong wear resistance and corrosion resistance, long service life, high thermal conductivity, small influence on heat transfer, high thermal shock resistance and low peeling; the engineering cost is low, the low-temperature hardening performance is good, the construction is convenient, and the maintenance period is short.
[0032] According to an embodiment of the present application, the preparation method further comprises the following steps of preparing the plasticable layer:
[0033] The alumina, zircon sand, chromium sand, silicon carbide, kaolin, heat-conducting filler and adhesive are mixed once to obtain the plasticable layer.
[0034] According to an embodiment of the present application, the mixing time is 5min-10min.
[0035] According to an embodiment of the present application, the preparation method further comprises the following steps of preparing the coating:
[0036] The alumina, chromium sand, silicon carbide and coagulation accelerator are mixed twice to obtain the coating.
[0037] According to an embodiment of the present application, the mixing time is 3min-5min.
[0038] The third aspect of the present application provides the application of the anti-corrosion target area wear-resistant refractory material of the first aspect or the anti-corrosion target area wear-resistant refractory material obtained by the preparation method of the second aspect in a circulating fluidized bed boiler separator.
[0039] The anti-corrosion target area wear-resistant refractory material can greatly improve the surface strength and corrosion resistance of the circulating fluidized bed separator target area material, avoid corrosion caused by ammonium bisulfate generated after SNCR denitration, and damage of the target area caused by thermal stress change.
[0040] Additional aspects and advantages of the application will be set forth in part in the description which follows, and in part will become apparent to those skilled in the art upon examination of the following and / or can be learned by practice of the application. BRIEF DESCRIPTION OF DRAWINGS
[0041] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings, wherein:
[0042] Figure 1 A schematic diagram of the anti-corrosion target area wear-resistant refractory material is shown. DETAILED DESCRIPTION
[0043] Embodiments of the present application are described in detail below. The embodiments described below are examples for explaining the present application and should not be understood as limiting the present application.
[0044] It should be noted that the terms "first", "second" are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. Further, in the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.
[0045] The endpoints of the ranges and any values described herein are not limited to the precise values stated. The ranges and values should be construed to be approximations that allow for significant variation. Within each range, other values can exist that are not expressly identified. For ranges comprising two or more parameters, any combination of these parameters within the value range is also contemplated unless otherwise specifically stated.
[0046] In order to facilitate the understanding of the present application, some technical and scientific terms are defined in detail below. Unless otherwise explicitly defined herein elsewhere, all other technical and scientific terms used herein have the meanings commonly understood by one of ordinary skill in the art to which the present application belongs.
[0047] In this document, the term "comprising" or "including" is an open-ended expression that includes the indicated content, but does not exclude other content.
[0048] In this document, the terms "optionally," "optional," or "may" generally mean that the subsequently described event or circumstance can or can not occur, and the description includes instances where the event or circumstance occurs, and instances where it does not.
[0049] According to the embodiments of the present application, the first aspect of the present application provides an anti-corrosion target area wear-resistant refractory material, which comprises a plastic layer and a coating layer arranged in a stack;
[0050] The raw materials for preparing the plastic layer include alumina, zirconia sand, chrome sand, silicon carbide, and kaolin, wherein the content of each component is: 60wt%-70wt% of alumina, 5wt%-10wt% of zirconia sand, 5wt%-15wt% of chrome sand, 5wt%-15wt% of silicon carbide, and 5wt%-10wt% of kaolin.
[0051] The raw materials for preparing the coating layer include alumina, chrome sand, and silicon carbide, wherein the content of each component is: 60wt%-75wt% of alumina, 10wt%-20wt% of chrome sand, and 10wt%-20wt% of silicon carbide.
[0052] The anti-corrosion target area wear-resistant refractory material provided by the present application increases the anti-wear and other capabilities of the target area part from the material perspective, improves the wear resistance, thermal vibration stability, and corrosion resistance of the anti-corrosion target area wear-resistant refractory material by using components with specific proportions, and prolongs the service life. In addition, the coating layer has acid and alkali resistance, can embed into the pores and micro-cracks on the surface of the plastic layer, close the surface pores of the plastic layer, form a dense surface layer, and avoid the invasion of corrosive substances into the plastic layer to ensure the implementation effect.
[0053] According to specific embodiments of the present application, the chemical composition of the coating layer contains Al2O3≥80wt%, Fe2O3≤1.0wt%, and SiC≥10wt%, and as some specific examples, the content of Al2O3 in the chemical composition of the coating layer can be 80wt%, 81wt%, 82wt%, 83wt%, 84wt%, 85wt%, etc., the content of Fe2O3 can be 1.0wt%, 0.9wt%, 0.8wt%, 0.7wt%, 0.6wt%, etc., and the content of SiC can be 10wt%, 11wt%, 12wt%, 13wt%, 14wt%, 15wt%, etc.
[0054] According to specific embodiments of the present application, the refractoriness of the coating layer is ≥1800℃, the bulk density is 2.8g / cm 3 ~3.5g / cm 3 , and the porosity is 13%-18%, and as some specific examples, the bulk density of the coating layer can be 2.8g / cm 3, 3.0 g / cm 3 , 3.2 g / cm 3 , 3.4 g / cm 3 , etc. The porosity can be 13%, 14%, 15%, 16%, 17%, 18%, etc.
[0055] According to a specific embodiment of the present application, the average particle size of the coating is 0.5 mm to 2 mm, wherein the proportion of particles with a particle size of 1 mm or less is > 75 wt%.
[0056] According to a specific embodiment of the present application, the raw material for preparing the coating further comprises a coagulation accelerator. Specifically, the coagulation accelerator enhances the bonding strength of the coating to the plasticizable layer by chemical reaction with the surface of the coating and the plasticizable layer, preventing the coating from peeling off.
[0057] According to a specific embodiment of the present application, the content of the coagulation accelerator in the coating is 0.2 wt% to 1.0 wt%, and as some specific examples, the content of the coagulation accelerator in the coating can be 0.2 wt%, 0.4 wt%, 0.6 wt%, 0.8 wt%, 1.0 wt%, etc.
[0058] According to a specific embodiment of the present application, the type of the coagulation accelerator is not particularly limited, and as some specific examples, the coagulation accelerator includes but is not limited to sodium fluorosilicate.
[0059] According to a specific embodiment of the present application, the chemical composition of the plasticizable layer is Al2O3≥ 80 wt%, Fe2O3≤ 1.0 wt%, SiC≥ 10 wt%, and as some specific examples, the content of Al2O3 in the chemical composition of the plasticizable layer can be 80 wt%, 81 wt%, 82 wt%, 83 wt%, 84 wt%, 85 wt%, etc., the content of Fe2O3 can be 1.0 wt%, 0.9 wt%, 0.8 wt%, 0.7 wt%, 0.6 wt%, etc., and the content of SiC can be 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, etc.
[0060] According to a specific embodiment of the present application, the plasticizable layer has a refractoriness of ≥ 1800℃, a bulk density of 2.6 g / cm 3 to 3.2 g / cm 3 , and a porosity of 15% to 20%, and as some specific examples, the bulk density of the plasticizable layer can be 2.6 g / cm 3 , 2.8 g / cm 3 , 3.0 g / cm 3 , 3.2 g / cm 3 , etc., and the porosity can be 15%, 16%, 17%, 18%, 19%, 20%, etc.
[0061] According to a specific embodiment of the present application, the average particle size of the plasticable layer is 0.5mm-3mm, wherein the proportion of particles with a particle size of 1mm or less is >60wt%.
[0062] According to a specific embodiment of the present application, the raw material for preparing the plasticable layer further comprises a heat-conducting filler.
[0063] According to a specific embodiment of the present application, the content of the heat-conducting filler in the plasticable layer is 2wt%-4wt%, and as some specific examples, the content of the heat-conducting filler in the plasticable layer can be 2wt%, 3wt%, 4wt%, etc.
[0064] According to a specific embodiment of the present application, the type of the heat-conducting filler is not particularly limited, and as some specific examples, the heat-conducting filler includes but is not limited to boron nitride.
[0065] According to a specific embodiment of the present application, the thermal conductivity of the plasticable layer at 1000℃ is 5W / (m·K)-15W / (m·K), and as some specific examples, the thermal conductivity of the plasticable layer at 1000℃ can be 5W / (m·K), 10W / (m·K), 15W / (m·K), etc.
[0066] According to a specific embodiment of the present application, the pH value of the plasticable layer is 4-6, and as some specific examples, the pH value of the plasticable layer can be 4, 5, 6, etc.
[0067] According to a specific embodiment of the present application, the raw material for preparing the plasticable layer further comprises a binder.
[0068] According to a specific embodiment of the present application, the content of the binder in the plasticable layer is 5wt%-10wt%, and as some specific examples, the content of the binder in the plasticable layer can be 5wt%, 6wt%, 7wt%, 8wt%, 9wt%, 10wt%, etc.
[0069] According to a specific embodiment of the present application, the type of the binder is not particularly limited, and as some specific examples, the binder includes but is not limited to phosphoric acid.
[0070] According to a specific embodiment of the present application, the surface of the plasticable layer comprises protrusions and grooves, and the height difference between the protrusions and the grooves is 10mm-30mm (schematic diagram as shown in Figure 1The plastic layer is arranged in a concave-convex staggered manner, which forms a complex three-dimensional fitting structure and produces a strong mechanical interlocking effect, thereby enhancing the structural firmness and anti-falling ability of the whole. On the other hand, the arrangement can improve the flow field, disperse the airflow or particle impact, thereby reducing the abrasion, and facilitating the construction and maintenance.
[0071] According to the embodiment of the present application, the second aspect of the present application provides a preparation method of the anti-corrosion target area wear-resistant refractory material, and the preparation method comprises the following steps:
[0072] The plastic layer is laid on the target area, and a coating is coated on the plastic layer to obtain the anti-corrosion target area wear-resistant refractory material.
[0073] In the preparation method provided by the present application, the coating is embedded in the pores and micro-cracks on the surface of the plastic layer, thereby sealing the pores on the surface of the plastic layer and avoiding the peeling and corrosion of the plastic layer.
[0074] According to the specific embodiment of the present application, the laying method is not particularly limited, and as some specific examples, the laying method comprises at least one of stuffing and ramming.
[0075] Specifically, the surface of the plastic layer laid on the target area can be made into a micro-rough structure by equipment.
[0076] According to the specific embodiment of the present application, the coating method is not particularly limited, and as some specific examples, the coating method comprises at least one of smearing and spraying.
[0077] According to the specific embodiment of the present application, the preparation method further comprises the following steps of preparing the plastic layer:
[0078] The alumina, zircon sand, chromium sand, silicon carbide, kaolin, heat-conducting filler and binder are mixed to obtain the plastic layer.
[0079] Specifically, the finished product of the plastic layer is in a powder form.
[0080] According to the specific embodiment of the present application, the specific operation of the primary mixing can not be particularly limited, and the mixing can be performed as long as the uniform mixing purpose is achieved, for example, the raw materials can be mixed, crushed, ground and homogenized.
[0081] According to the specific embodiment of the present application, the time of the primary mixing is 5 min to 10 min, and as some specific examples, the time of the primary mixing can be 5 min, 6 min, 7 min, 8 min, 9 min, 10 min, etc.
[0082] According to a specific embodiment of the present application, the preparation method further comprises the following steps of preparing the coating:
[0083] The alumina, chrome sand, silicon carbide and coagulation accelerator are secondarily mixed to obtain the coating.
[0084] Specifically, the finished product of the coating is in powder form.
[0085] According to a specific embodiment of the present application, the secondary mixing time is 3-5 minutes, and as some specific examples, the secondary mixing time can be 3 minutes, 4 minutes, 5 minutes, etc.
[0086] According to a specific embodiment of the present application, the preparation method further comprises the following steps: applying a plastic layer to the target area, coating the coating on the plastic layer, and curing treatment to obtain the corrosion-resistant target area wear-resistant refractory material.
[0087] Specifically, the curing treatment can be performed without using an oven, and a natural curing method is used. The coating is green before natural curing, and the natural curing time is 6-12 hours. After construction is completed, the coating is left to stand for 2-3 days, and the maintenance time of the flue gas temperature in the 300-400℃ and 500-600℃ temperature ranges is respectively extended by 30 minutes during the start-up process, so as to improve the bonding degree of the plastic layer and the coating, and improve the strength and corrosion resistance.
[0088] According to an embodiment of the present application, the third aspect of the present application provides an application of the corrosion-resistant target area wear-resistant refractory material of the first aspect or the corrosion-resistant target area wear-resistant refractory material obtained by the preparation method of the second aspect in a circulating fluidized bed boiler separator.
[0089] The corrosion-resistant target area wear-resistant refractory material provided by the present application can greatly improve the surface strength and corrosion resistance of the target area material of the circulating fluidized bed separator, avoid corrosion caused by ammonium bisulfate generated after SNCR denitration, and avoid damage to the target area caused by thermal stress changes.
[0090] The solutions of the present application will be explained in combination with the embodiments below. Those skilled in the art will understand that the embodiments below are only used to illustrate the present application, and should not be regarded as limiting the scope of the present application. If the specific techniques or conditions are not specified in the embodiments, the techniques or conditions described in the literature in the art or according to the product instructions are used. If the reagents or instruments are not specified by the manufacturer, they are all conventional products that can be obtained by purchase.
[0091] Example 1
[0092] The present embodiment provides a corrosion-resistant target area wear-resistant refractory material and a preparation method thereof, and the preparation method comprises the following steps:
[0093] 65wt% of alumina, 7wt% of zircon sand, 8wt% of chrome sand, 8wt% of silicon carbide, 5wt% of kaolin, 2wt% of boron nitride, 5wt% of phosphoric acid are mixed and stirred for 5min by using a forced stirrer to obtain a plastic layer, and the average particle size of the raw materials is 1mm;
[0094] 65wt% of alumina, 10wt% of chrome sand, 15wt% of silicon carbide, 0.2wt% of sodium fluorosilicate are mixed and stirred for 4min to obtain a coating layer, and the average particle size of the raw materials is 1mm;
[0095] The plastic layer is laid on the target area part by filling and ramming, and the coating layer is sprayed on the plastic layer and naturally cured for 6h to obtain the corrosion-resistant target area wear-resistant refractory material.
[0096] Example 2
[0097] The embodiment provides a corrosion-resistant target area wear-resistant refractory material and a preparation method thereof, and the preparation method comprises the following steps:
[0098] 70wt% of alumina, 5wt% of zircon sand, 10wt% of chrome sand, 5wt% of silicon carbide, 8wt% of kaolin, 2wt% of boron nitride, and 5wt% of phosphoric acid are mixed and stirred for 6min by using a forced stirrer to obtain a plastic layer, and the average particle size of the raw materials is 1.5mm;
[0099] 75wt% of alumina, 15wt% of chrome sand, 10wt% of silicon carbide, and 0.5wt% of sodium fluorosilicate are mixed and stirred for 4min to obtain a coating layer, and the average particle size of the raw materials is 0.8mm;
[0100] The plastic layer is laid on the target area part by filling and ramming, and the coating layer is sprayed on the plastic layer and naturally cured for 8h to obtain the corrosion-resistant target area wear-resistant refractory material.
[0101] Example 3
[0102] The embodiment provides a corrosion-resistant target area wear-resistant refractory material and a preparation method thereof, and the preparation method comprises the following steps:
[0103] 60wt% of alumina, 10wt% of zircon sand, 15wt% of chrome sand, 10wt% of silicon carbide, 5wt% of kaolin, 4wt% of boron nitride, and 6wt% of phosphoric acid are mixed and stirred for 5min by using a forced stirrer to obtain a plastic layer, and the average particle size of the raw materials is 0.8mm;
[0104] Mixing and stirring 60wt% of alumina, 20wt% of chromium ore sand, 20wt% of silicon carbide, 0.3wt% of sodium fluorosilicate for 4min to obtain a coating layer, and the average particle size of the raw material is 1.2mm;
[0105] The plastic layer is laid on the target area by filling and ramming, and the coating layer is sprayed on the plastic layer and naturally cured for 8h to obtain the corrosion-resistant target area refractory material.
[0106] Comparative Example 1
[0107] The difference between this comparative example and Example 1 is that the plastic layer is not laid, and the coating layer is directly coated on the target area.
[0108] Comparative Example 2
[0109] The difference between this comparative example and Example 1 is that the plastic layer is laid on the target area, and the coating layer is not coated on the plastic layer.
[0110] Test Example
[0111] The wear-resistant refractory materials prepared in the examples and comparative examples are tested for performance, and the test methods are as follows:
[0112] (1) Wear resistance
[0113] The wear resistance is tested according to GB / T 18301.
[0114] (2) Corrosion resistance
[0115] The corrosion resistance is tested according to GB / T 10125.
[0116] (3) Thermal shock resistance
[0117] The thermal shock resistance is tested according to GB / T 30873.
[0118] (4) pH value
[0119] The pH value is tested according to JC / T 2709.
[0120] (5) Porosity
[0121] The porosity is tested according to GB / T 2997.
[0122] (6) Thermal conductivity
[0123] The thermal conductivity is tested according to GB / T 22588.
[0124] (7) Bulk density
[0125] The bulk density is tested according to GB / T 2997.
[0126] The results of the performance tests of the wear-resistant refractory materials prepared in Examples 1-3 and Comparative Examples 1-2 are shown in Table 1.
[0127] Table 1
[0128]
[0129]
[0130] Results analysis:
[0131] From the data in Table 1, it can be seen that the wear-resistant refractory materials prepared in Examples 1-3 have excellent wear resistance, corrosion resistance, thermal shock resistance and thermal conductivity compared with the comparative examples.
[0132] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples without contradiction.
[0133] Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.
Claims
1. A corrosion-resistant target wear-resistant refractory material, characterized in that: The anti-corrosion target area wear-resistant and refractory material includes a plastic layer and a coating layer arranged in a stacked manner; The raw materials for preparing the plastic layer include aluminum oxide, zircon sand, chromium ore, silicon carbide, and kaolin, wherein the content of each component is: aluminum oxide 60wt% to 70wt%, zircon sand 5wt% to 10wt%, chromium ore 5wt% to 15wt%, silicon carbide 5wt% to 15wt%, and kaolin 5wt% to 10wt%; The raw materials for preparing the coating include aluminum oxide, chromium ore and silicon carbide, wherein the content of each component is: aluminum oxide 60wt% to 75wt%, chromium ore 10wt% to 20wt%, and silicon carbide 10wt% to 20wt%.
2. The corrosion-resistant target wear-resistant refractory material according to claim 1, characterized in that: The chemical composition of the coating is Al2O3≥80wt%, Fe2O3≤1.0wt%, and SiC≥10wt%; Optionally, the coating has a refractoriness of ≥1800°C and a bulk density of 2.8 g / cm 3 ~3.5g / cm 3 , porosity is 13% to 18%; Optionally, the average particle size of the coating is 0.5 mm to 2 mm, wherein the proportion of particles with a particle size of less than 1 mm is greater than 75 wt%.
3. The corrosion-resistant target wear-resistant refractory material according to claim 1, characterized in that: The raw materials for preparing the coating also include a coagulant and curing agent; Optionally, the content of the accelerating curing agent in the coating is 0.2 wt% to 1.0 wt%; Optionally, the accelerating curing agent comprises sodium fluorosilicate.
4. The corrosion-resistant target wear-resistant refractory material according to claim 1, characterized in that: The chemical composition of the plastic layer includes Al2O3≥80wt%, Fe2O3≤1.0wt%, and SiC≥10wt%; Optionally, the plastic layer has a refractoriness of ≥1800°C and a bulk density of 2.6 g / cm 3 ~3.2g / cm 3 , the porosity is 15% to 20%; Optionally, the average particle size of the plastic layer is 0.5 mm to 3 mm, wherein particles with a particle size of less than 1 mm account for more than 60 wt%.
5. The corrosion-resistant target wear-resistant refractory material according to claim 1, characterized in that: The raw materials for preparing the plastic layer also include thermally conductive fillers; Optionally, the content of the thermally conductive filler in the plastic layer is 2 wt% to 4 wt%; Optionally, the thermally conductive filler comprises boron nitride; Optionally, the thermal conductivity of the plastic layer at 1000° C. is 5 W / (m·K) to 15 W / (m·K); Optionally, the pH value of the plastic layer is 4 to 6; Optionally, the raw materials for preparing the plastic layer further include a binder; Optionally, the content of the adhesive in the plastic layer is 5 wt% to 10 wt%; Optionally, the binder comprises phosphoric acid.
6. The corrosion-resistant target wear-resistant refractory material according to claim 1, characterized in that: The surface of the plastic layer includes protrusions and grooves, and the height difference between the protrusions and grooves is 10 mm to 30 mm.
7. A method for preparing the corrosion-resistant target wear-resistant refractory material according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: The plastic layer is laid on the target area, and a coating is applied on the plastic layer to obtain the corrosion-resistant target area wear-resistant and fire-resistant material.
8. The preparation method according to claim 7, characterized in that The preparation method further comprises the following steps of preparing the plastic layer: Alumina, zircon sand, chromium ore sand, silicon carbide, kaolin, thermal conductive filler, and adhesive are mixed once to obtain the plastic layer; Optionally, the time for the first mixing is 5 min to 10 min.
9. The preparation method according to claim 7, characterized in that The preparation method further comprises the following steps of preparing the coating: Aluminum oxide, chromium ore, silicon carbide, and a coagulant accelerating curing agent are mixed for a second time to obtain the coating; Optionally, the secondary mixing time is 3 min to 5 min.
10. Use of the corrosion-resistant target wear-resistant refractory material according to any one of claims 1 to 6 or the corrosion-resistant target wear-resistant refractory material obtained by the preparation method according to any one of claims 7 to 9 in a circulating fluidized bed boiler separator.