Coking inhibiting composition, coking inhibitor, and method for using coking inhibiting composition

Abstract

The invention relates to the technical field of boiler coking inhibition, in particular to a coking inhibition composition, a coking inhibitor and a use method of the coking inhibition composition. The coking inhibition composition provided by the invention is prepared from the following components in parts by mass: 60 to 70 parts of expansive layered aluminosilicate and 20 to 40 parts of lubricating layered aluminosilicate, wherein the expansive layered aluminosilicate is prepared from one or more of bentonite, montmorillonite and activated clay; the lubricating layered aluminosilicate comprises one or more of talc, mica, pyrophyllite, asbestos and serpentine. The coking inhibition composition provided by the invention can obviously reduce the thickness of boiler coking, so that the coking inhibition composition has the advantage of easiness in cleaning, and in addition, the coking inhibition composition also has the advantages of low cost and safety.

Description

Technical Field

[0001] The present application relates to the technical field of boiler coking inhibition, and in particular to a coking inhibition composition, a coking inhibitor, and a method for using the coking inhibition composition. Background Art

[0002] With the development of industry, boilers, as important heat energy conversion equipment, have been widely used in various fields. However, the problem of boiler coking has always been a difficult problem that troubles the industry.

[0003] Boiler coking refers to the formation of hard coke when the ash in the fuel melts at high temperature and adheres to the heating surface during boiler operation. Hard coke not only reduces the thermal efficiency of the boiler, but also increases the thermal resistance of the heating surface. In severe cases, it may cause damage to the heating surface and affect the safe operation of the boiler.

[0004] Traditional coking inhibitors are mainly nitrates. Although nitrates decompose and release oxygen at high temperatures to help combustion, they also release highly toxic nitrogen oxides, which poses a safety hazard. In addition, there are coking inhibitors that mainly contain magnesium-based flame retardants, but their cost is relatively high and is not conducive to large-scale application. Summary of the invention

[0005] Based on this, the present application provides a coking inhibitor composition, a coking inhibitor, and a method for using the coking inhibitor composition. The coking inhibitor composition provided in the present application can significantly reduce the thickness of boiler coking, so it has the advantage of being easy to clean, and in addition, it also has the advantages of low cost and safety.

[0006] In a first aspect of the present application, there is provided a coking inhibition composition, comprising, by weight, 60 to 70 parts of an expandable layered aluminosilicate and 20 to 40 parts of a lubricating layered aluminosilicate;

[0007] Wherein, the expansive layered aluminosilicate comprises one or more of bentonite, montmorillonite and activated clay;

[0008] The lubricating layered aluminosilicate includes one or more of talc, mica, pyrophyllite, asbestos and serpentine.

[0009] In one embodiment, the expandable layered aluminosilicate comprises bentonite.

[0010] In one embodiment, the lubricating layered aluminosilicate includes one or more of talc and serpentine.

[0011] In one embodiment, the lubricating layered aluminosilicate comprises talc and serpentine in a mass ratio of 1:(0.8-1.2).

[0012] In one embodiment, the coking inhibition composition further comprises 10 to 20 parts of metal oxide by weight.

[0013] In one embodiment, the metal oxide includes one or more of iron oxide and ferrous oxide.

[0014] In one embodiment, the coking inhibition composition includes 60 to 70 parts of bentonite, 20 to 25 parts of talc and 10 to 15 parts of iron oxide.

[0015] In one embodiment, the coking inhibition composition includes 60 to 70 parts of bentonite, 10 to 20 parts of talc and 10 to 20 parts of serpentine.

[0016] The second aspect of the present application provides a coking inhibitor, comprising the coking inhibitor composition described in any embodiment of the first aspect of the present application.

[0017] The third aspect of the present application provides a method for using a coking inhibition composition, comprising the following steps: adding the coking inhibition composition described in any embodiment of the first aspect of the present application to the coking area or feeding system of a boiler, wherein the mass ratio of the coking inhibition composition to the total fuel is (0.3 kg to 1 kg): 1 ton.

[0018] The coking inhibition composition provided in the present application has at least the following beneficial effects:

[0019] The present application uses a compound of a specific type and a specific mass fraction of an expansive layered aluminosilicate and a lubricating layered aluminosilicate, and the two work together to enable the coking inhibition composition in the present application to react physically and chemically with the ash particles, so as to change the form of coking by increasing the melting point of ash and slag, physical expansion, etc., thereby solving the problem of boiler coking and ash accumulation. Specifically, the expansive layered aluminosilicate in the coking inhibition composition can adsorb harmful gases, incompletely burned organic matter and metal ions produced by boiler combustion, reduce the deposition of these substances on the heating surface, and reduce the coking inducement. On the other hand, its expansibility enables it to form a covering layer with a certain barrier effect on the heating surface, preventing the sediment from directly contacting and adhering to the heating surface, and at the same time filling between the coking particles or covering the surface of the coke layer, isolating the air from the coke layer, and inhibiting the further oxidation and growth of the coke layer. At the same time, the lubricating layered aluminosilicate can change the surface properties of the ash particle surface, and play an isolating role to reduce the surface viscosity of the ash particles, so that the coking is less and easier to handle.

[0020] In addition, the present application uses low-cost expandable layered aluminosilicates, lubricating layered aluminosilicates and other minerals as raw materials, which has the advantage of low cost; at the same time, it can also avoid the high-temperature decomposition of the coking inhibition composition, and can effectively reduce the generation of toxic or harmful gases, which is in line with the green and environmentally friendly chemical concept.

[0021] Furthermore, the coking inhibition composition provided in the present application has a wide range of applications and can be used to treat coking and ash accumulation problems in coal-fired boilers, environmental protection boilers, industrial coal-fired boilers, non-ferrous metallurgical boilers, etc. DETAILED DESCRIPTION

[0022] The following is a further complete and clear description of the coking inhibition composition, coking inhibitor, and method of using the coking inhibition composition of the present application in conjunction with specific examples. The present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive.

[0023] It should be understood that the terms described in this application are only for describing specific embodiments and are not intended to limit this application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0024] Unless otherwise indicated, all technical and scientific terms used herein have the same meanings as those generally understood by those skilled in the art in the field described in the present application. Although the present application only describes preferred methods and materials, any methods and materials similar or equivalent to those described herein may also be used in the implementation or testing of the present application. All documents mentioned in this specification are incorporated by reference to disclose and describe the methods and / or materials related to the documents. In the event of any conflict with any incorporated document, the content of this specification shall prevail.

[0025] As used herein, "one or more" refers to any one, any two, or any two or more of the listed items.

[0026] In this application, "first aspect", "second aspect", "third aspect", "fourth aspect", "fifth aspect", etc. are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or quantity, nor can they be understood as implicitly indicating the importance or quantity of the indicated technical features. Moreover, "first", "second", "third", "fourth", "fifth", etc. only serve the purpose of non-exhaustive enumeration and description, and it should be understood that they do not constitute a closed limitation on quantity.

[0027] In the present application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0028] In addition, for the numerical ranges in this application, it is understood that each intermediate value between the upper and lower limits of the range is also specifically disclosed. Each smaller range between any stated value or intermediate value in the stated range and any other stated value or intermediate value in the stated range is also included in this application. The upper and lower limits of these smaller ranges can be independently included or excluded in the range. In other words, unless otherwise indicated, all ranges disclosed herein are understood to include any and all subranges included therein.

[0029] Due to the complex mechanism of boiler coking, the current traditional decoking inhibitors have a very narrow scope of application and basically only work on a certain temperature range of the boiler. The success rate of successfully solving the problem is not high, less than 20% overall. Many of them even have side effects such as toxic gas decomposition and serious corrosion to boiler equipment.

[0030] Based on a lot of rich experience and sufficient experiments, the inventors of this application have found that the coking mechanism of the coking process mainly includes three stages: initial deposition, deposition growth, and deposition solidification. At higher temperatures, the ash in the fuel will be in the form of a melt. At this time, there are three main forces in the boiler: the action between ash particles and the melt, the interaction between ash particles, and the interaction between melts. Among these three actions, the liquid bridge force plays a leading role, that is, the interaction between the negative pressure of the melt and the surface tension causes adhesion, which in turn leads to coking.

[0031] Based on this, the first aspect of the present application provides a coking inhibition composition, which comprises 60 to 70 parts by mass of expandable layered aluminosilicate and 20 to 40 parts by mass of lubricating layered aluminosilicate.

[0032] Wherein, the expandable layered aluminosilicate includes one or more of bentonite, montmorillonite and activated clay.

[0033] The lubricating layered aluminosilicate includes one or more of talc, mica, pyrophyllite, asbestos and serpentine.

[0034] The coking inhibition composition provided in the present application is a highly active powder product, which can be sprayed into the coking area via compressed air or mixed into fuel particles for use.

[0035] The present application uses a compound of expandable layered aluminosilicate and lubricating layered aluminosilicate, and the two work together to enable the coking inhibition composition in the present application to undergo a physical and chemical reaction with ash particles, so as to change the form of coking by increasing the ash melting point, physical expansion, etc., thereby solving the problem of boiler coking and ash accumulation.

[0036] Specifically, the expansive layered aluminosilicate in the coking inhibition composition can adsorb harmful gases, incompletely burned organic matter, metal ions, etc. produced by boiler combustion, reduce the deposition of these substances on the heating surface, and reduce the cause of coking. On the other hand, its expansibility enables it to form a covering layer with a certain barrier effect on the heating surface, preventing the sediment from directly contacting and adhering to the heating surface. At the same time, it can also fill between the coking particles or cover the surface of the coke layer, isolating the air from the coke layer, and inhibiting further oxidation and growth of the coke layer. Hydrated aluminosilicates have high thermal stability, which can increase the melting point of ash; at the same time, the lubricating layered aluminosilicate hydrated magnesium silicate can change the surface properties of the ash particles and play an isolating role to reduce the surface viscosity of the ash particles, so that the coke is less brittle and easier to handle.

[0037] In addition, the present application uses low-cost expandable layered aluminosilicate hydrated aluminosilicate, lubricating layered aluminosilicate hydrated magnesium silicate and other minerals as raw materials, which has the advantage of low cost; at the same time, it can also avoid the high-temperature decomposition of the coking inhibition composition, and can effectively reduce the generation of toxic or harmful gases, which is in line with the green and environmentally friendly chemical concept.

[0038] Furthermore, the coking inhibition composition provided in the present application has a wide range of applications and can be used to treat coking and ash accumulation problems in coal-fired boilers, environmental protection boilers, industrial coal-fired boilers, non-ferrous metallurgical boilers, etc.

[0039] It can be understood that the specific types of expandable layered aluminosilicates mentioned in the present application, such as bentonite, montmorillonite and activated clay, can be hydrated aluminosilicates with similar structures synthesized by chemical methods.

[0040] It can be understood that the specific types of lubricating layered aluminosilicates mentioned in the present application, such as talc, mica, pyrophyllite and serpentine, can be hydrated metal silicates of similar structure synthesized by chemical methods.

[0041] The inventors of the present application have found through repeated research and experiments that the selection of each component and ratio in the coking inhibition composition can significantly affect the coking inhibition effect. It is understandable that in the present application, the mass fraction of the expansive layered aluminosilicate in the coking inhibition composition can be selected from any value between 60 and 70 parts. For example, the mass fraction of the expansive layered aluminosilicate includes but is not limited to 60 parts, 61 parts, 63 parts, 65 parts, 67 parts, 67.4 parts, 67.5 parts, 67.6 parts, 68 parts, 69 parts or 70 parts, or within the range of any two of the above point values.

[0042] It can be understood that in the present application, the mass fraction of the lubricating layered aluminosilicate can be selected from any value between 20 and 40. For example, the mass fraction of the lubricating layered aluminosilicate includes but is not limited to 20, 22, 22.4, 22.5, 22.6, 23, 25, 28, 30, 32, 35, 38, 39 or 40 parts, or within the range of any two of the above values.

[0043] The present applicant has found that the types of expandable layered aluminosilicate and lubricating layered aluminosilicate also play an important role in the thickness of coke and the like.

[0044] Furthermore, the expandable layered aluminosilicate includes bentonite.

[0045] Furthermore, the lubricating layered aluminosilicate includes one or more of talc and serpentine.

[0046] By further optimizing the types of expandable layered aluminosilicates and lubricating layered aluminosilicates, not only can the coking content be effectively reduced and the coking treatment time be shortened, but the coking inhibition composition provided in the present application can also be operated without stopping the machine, without affecting the load and operation, so as to extend the equipment operation time and avoid the economic losses caused by load and shutdown, which has obvious economic benefits and can extend the life of the equipment.

[0047] In one example, the lubricating layered aluminosilicate includes talc and serpentine in a mass ratio of 1:(0.8-1.2). For example, the mass ratio of talc and serpentine includes but is not limited to 1:0.8, 1:0.85, 1:0.88, 1:0.9, 1:0.95, 1:0.98, 1:1, 1:1.02, 1:1.05, 1:1.08, 1:1.1, 1:1.15, 1:1.18 or 1:1.2, or a range formed by any two of the above point values ​​as endpoint values.

[0048] In one example, the coking inhibition composition includes 60 to 70 parts of an expansive layered aluminosilicate, 10 to 20 parts of talc, and 10 to 20 parts of serpentine, by weight. For example, the weight parts of the expansive layered aluminosilicate include, but are not limited to, 60, 61, 65, 68 or 70 parts. The weight parts of talc include, but are not limited to, 10, 15, 18, 19, 19.5 or 20 parts. The weight parts of serpentine include, but are not limited to, 10, 15, 18, 19, 19.5 or 20 parts.

[0049] Furthermore, the present application has found that when the lubricating layered aluminosilicate contains both talc and serpentine, the synergistic effect of the two is more excellent. In this case, the coking inhibitor is more suitable for coal-fired boilers to prevent coking when burning low-melting-point coal.

[0050] In one example, the coking inhibition composition further includes 10 to 20 parts of metal oxides by mass. For example, the mass fractions of metal oxides include but are not limited to 10, 11, 12, 13, 15, 17, 18, 19 or 20 parts, or within the range of any two of the above point values. The present application finds that when a metal oxidant is further added to the coking inhibition composition, it is more suitable for treating the radiation zone of a non-ferrous metallurgical furnace, especially at a higher temperature; it focuses on treating coking in the ascending flue.

[0051] In one example, the metal oxide includes one or more of iron oxide and ferrous oxide.

[0052] In one example, the coking inhibition composition includes 60 to 70 parts of bentonite, 20 to 25 parts of talc and 10 to 15 parts of iron oxide. It is understood that the weight parts of bentonite can be selected from any value between 60 and 70 parts. For example, the weight parts of bentonite include but are not limited to 60, 62, 65, 67, 67.5, 68 or 70 parts. The weight parts of talc include but are not limited to 20, 22, 22.5, 23 or 25 parts. The weight parts of iron oxide include but are not limited to 10, 11, 12, 14 or 15 parts.

[0053] A second aspect of the present application provides a coking inhibitor, comprising the coking inhibitor composition described in any one of the examples of the first aspect of the present application.

[0054] In one example, the coking inhibitor further includes other additives.

[0055] It can be understood that as long as the coking inhibitor composition provided in the first aspect of the present application is used as the main component of the coking inhibitor, it is within the scope of protection of the present application, and those skilled in the art can add other additives to the coking inhibitor composition provided in the first aspect of the present application to form a coking inhibitor.

[0056] The third aspect of the present application provides a method for using a coking inhibition composition, comprising the following steps: adding the coking inhibition composition described in any embodiment of the first aspect of the present application to the coking area or feeding system of the boiler, wherein the mass ratio of the coking inhibition composition to the total fuel is (0.3 kg~1 kg): 1 ton.

[0057] It can be understood that the use method of the coking inhibitor composition provided in the present application can be applied to boiler types including but not limited to coal-fired boilers, environmental protection boilers, industrial coal-fired boilers, and nonferrous metallurgical boilers. In addition, the dosage of the coking inhibitor composition provided in the present application is relatively low, and its mass ratio of the coking inhibitor composition to the total fuel is (0.3 kg to 1 kg): 1 ton can make the coke brittle, the coke thickness becomes thinner, and it is easy to handle. Specifically, the dosage of the coking inhibitor composition provided in the present application includes but is not limited to 0.3 kg / ton, 0.5 kg / ton, 0.7 kg / ton, 0.9 kg / ton or 1 kg / ton, or within the range of any two of the above point values.

[0058] The following further specific examples are provided to explain the present application in detail. It should also be understood that the following examples are only used to further explain the present application and cannot be understood as limiting the scope of protection of the present application. Some non-essential improvements and adjustments made by those skilled in the art based on the above content of the present application belong to the scope of protection of the present application. The specific process parameters of the following embodiments are also only examples within a suitable range, that is, those skilled in the art can make a selection within a suitable range through the description herein, and are not necessarily limited to the specific values ​​of the embodiments below.

[0059] [raw material]

[0060] [Expandable layered aluminosilicate]

[0061] Bentonite: Gansu Hongquan Bentonite Co., Ltd., sodium bentonite, 90%, 200 mesh.

[0062] Montmorillonite: Inner Mongolia Ningcheng Tianyu Bentonite Technology Co., Ltd., sodium montmorillonite, 95%, 325 mesh.

[0063] Activated clay: Huangshan Baiyue Activated Clay Co., Ltd., 325 mesh.

[0064] Kaolin: Hengda Kaolin Material Factory, Xiangcheng District, Suzhou City, 200 mesh.

[0065] [Lubricating layered aluminosilicate]

[0066] Talc: Haicheng Chengxin Fine Mesh Stone Powder Factory, 800 mesh.

[0067] Serpentine: Jiangxi Yiyang Central Asia Mining Co., Ltd., 200 mesh.

[0068] Asbestos: Dunhuang Senxin Mining Co., Ltd., 400 mesh.

[0069] Mica: Hebei Huayuan Mining Co., Ltd., phlogopite, 400 mesh.

[0070] Pyrophyllite: Jiangsu Ceramics Research Institute Co., Ltd., 200 mesh.

[0071] [Metal oxides]

[0072] Iron oxide: Zibo Zichuan Liqiang Pigment Co., Ltd., national standard 180, content greater than 96%, average particle size 500 mesh.

[0073] Ferrous oxide: Daye Jinpeng Friction Material Co., Ltd., 1250 mesh.

[0074] Embodiment 1 to Embodiment 17

[0075] Examples 1 to 17 of the present application provide a coking inhibitor and a method for using the same, specifically comprising the following steps:

[0076] (1) Prepare a coking inhibitor by mixing the raw materials according to the weight proportions in Table 1;

[0077] (2) The coking inhibitor prepared in step (1) was added to the ascending flue of the bottom-blown smelting furnace of the copper smelter and the furnace of the pulverized coal furnace burning high-sodium coal, and the mass ratio of the coking inhibitor added to the total mass of the fuel was 0.3 kg: 1 ton. The coking condition was observed.

[0078] Comparative Example 1 to Comparative Example 7

[0079] Comparative Examples 1 to 7 of the present application provide a coking inhibitor and a method for using the same, specifically comprising the following steps:

[0080] (1) Prepare the coking inhibitor by mixing the raw materials according to the weight proportions in Table 2;

[0081] (2) The coking inhibitor prepared in step (1) was added to the ascending flue of the bottom-blown smelting furnace of the copper smelter and the furnace of the pulverized coal furnace burning high-sodium coal, and the mass ratio of the coking inhibitor added to the total mass of the fuel was 0.3 kg: 1 ton. The coking condition was observed.

[0082] Table 1

[0083]

[0084] Table 2

[0085]

[0086] After the coking inhibitors of the above-mentioned embodiments and comparative examples were added to the ascending flue of the bottom-blown smelting furnace of the copper smelter and the furnace of the pulverized coal furnace burning high-sodium coal, the coking conditions were counted respectively. Among them, the coking data added to the ascending flue of the bottom-blown smelting furnace of the copper smelter include coking thickness, operation cycle, cleaning time, and cleaning time of coking. After adding to the furnace of the pulverized coal furnace burning high-sodium coal, the furnace outlet temperature and the amount of cooling water were counted respectively.

[0087] The above test results are shown in Table 3.

[0088] Table 3

[0089]

[0090] Compared with the comparative example and the blank control group, the coking inhibitor provided by the present application, when added to the ascending flue of the bottom-blown smelting furnace of the copper smelter, reduced the coking thickness, increased the operating time, and shortened the cleaning time. In addition, compared with the comparative example and the blank control group, when the coking inhibitor provided by the present application was added to the coking in the furnace of the pulverized coal furnace mixed with high-sodium coal, the furnace outlet temperature was reduced and the value of the cooling water volume was reduced. This shows that the coking inhibitor provided by the present application can significantly change the combustion conditions, reduce coking, and make the coking easy to clean.

[0091] The mass fractions of the expandable layered aluminosilicate and lubricating layered aluminosilicate added in Comparative Examples 1 and 4 are not within the scope of the present application; no lubricating layered aluminosilicate is added to Comparative Example 2; kaolin is added to Comparative Example 3 instead of the expandable layered aluminosilicate of the present application; the contents of the components in Comparative Examples 5 and 6 are not within the scope of the present application; and kaolin is also used in Comparative Example 7 and the contents of the components are not within the scope of the present application, resulting in poor coking inhibition properties.

[0092] Examples 10 to 12 of the present application are basically the same, the main difference being that different types of expandable layered aluminosilicates are used. As can be seen from Table 3, Example 10 uses bentonite, which has a better performance in inhibiting coking in the ascending flue of the bottom-blown smelting furnace of the copper smelter and in the furnace of the pulverized coal furnace burning high-sodium coal.

[0093] Example 10, Example 13 and Example 14 are basically the same, the main difference is that Example 13 and Example 14 do not use talc, and Example 13 and Example 14 use pyrophyllite and mica respectively. As shown in Table 3, Example 10 uses talc, which has better performance in inhibiting coking in the ascending flue of the bottom-blown smelting furnace of the copper smelter and the furnace of the pulverized coal furnace burning high-sodium coal.

[0094] In addition, the coking inhibitors of Examples 2 and 9 in the present application, in the coking treatment experiment of the ascending flue of the bottom-blown smelting furnace of a copper smelter, the coking thickness has become thinner, from 55cm / cycle before the test to 20-22cm / cycle. The operation cycle was extended from 5 days before the test to 16-18 days, and the coke body obviously changed from hard and dense to soft and loose, which was easy to clean, greatly saving the workers' coking time. This shows that the technical solutions of Examples 2 and 9 of the present application have better coking inhibition performance in the radiation zone of the non-ferrous metallurgical furnace. It shows that it is suitable for locations with higher temperatures and can focus on treating coking in the ascending flue.

[0095] The addition of the coking inhibitor in Example 10 of the present application detected a decrease in the furnace outlet temperature, and the total amount of cooling water also showed a downward trend compared to before the experiment. This shows that with the addition of the coking inhibitor, the combustion conditions can be significantly changed, coking can be reduced, and the heat exchange efficiency can be changed. This shows that Example 10 of the present application focuses on coal-fired boilers. In an experiment in which a pulverized coal furnace was mixed with high-sodium coal, the ash in the furnace melted, and the color changed from the original khaki to bright black, and the shape changed from large-grained sand to blocky; after adding the coking inhibitor, it was observed from the fire-viewing holes around the furnace that the thickness of most of the tube walls became thinner, and no melting was found on the surface.

[0096] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0097] The above-described embodiments only express several implementation methods of the present application, which is convenient for understanding the technical solution of the present application in detail, but it cannot be understood as limiting the scope of protection of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present application, several modifications and improvements can be made, which all belong to the scope of protection of the present application. It should be understood that the technical solutions obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the technical solutions provided in the present application are all within the scope of protection of the claims attached to the present application. Therefore, the scope of protection of the patent of this application shall be based on the content of the attached claims, and the description can be used to interpret the content of the claims.

Claims

1. A coking inhibition composition, characterized in that: The composition comprises 60 to 70 parts by weight of an expandable layered aluminosilicate and 20 to 40 parts by weight of a lubricating layered aluminosilicate; Wherein, the expansive layered aluminosilicate comprises one or more of bentonite, montmorillonite and activated clay; The lubricating layered aluminosilicate includes one or more of talc, mica, pyrophyllite, asbestos and serpentine.

2. The coking inhibition composition according to claim 1, characterized in that The expandable layered aluminosilicate includes bentonite.

3. The coking inhibition composition according to claim 1, characterized in that The lubricating layered aluminosilicate includes one or more of talc and serpentine.

4. The coking inhibition composition according to claim 1, characterized in that The lubricating layered aluminosilicate comprises talc and serpentine in a mass ratio of 1: (0.8-1.2).

5. The coking inhibition composition according to any one of claims 1 to 4, characterized in that The coking inhibition composition further comprises 10 to 20 parts of metal oxide in parts by mass.

6. The coking inhibition composition according to claim 5, characterized in that The metal oxide includes one or more of iron oxide and ferrous oxide.

7. The coking inhibition composition according to any one of claims 1 to 4, characterized in that The coking inhibition composition comprises 60 to 70 parts of bentonite, 20 to 25 parts of talc and 10 to 15 parts of iron oxide.

8. The coking inhibition composition according to any one of claims 1 to 4, characterized in that The coking inhibition composition comprises 60 to 70 parts of expandable layered aluminosilicate, 10 to 20 parts of talc and 10 to 20 parts of serpentine.

9. A coking inhibitor, characterized in that: The invention comprises the coking inhibition composition as described in any one of claims 1 to 8 of the present application.

10. A method for using a coking inhibition composition, characterized in that: The method comprises the following steps: adding the coking inhibition composition according to any one of claims 1 to 8 into a boiler coking area or a feeding system, wherein the mass ratio of the coking inhibition composition to the total fuel is (0.3 kg to 1 kg): 1 ton.

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