Coking inhibitor as well as use method and application of coking inhibitor

Abstract

The invention provides a coking inhibitor as well as a use method and application of the coking inhibitor. The coking inhibitor comprises an aluminum-containing compound and a silicon-containing inhibitor in a mass ratio of 1: (1.5-3.5), wherein the aluminum-containing compound comprises one or two of activated aluminum oxide and alumina; the silicon-containing inhibitor comprises a first silicon-containing compound and a second silicon-containing compound; the first silicon-containing compound comprises one or two of asbestos and serpentine; the second silicon-containing compound includes one or both of a silicon-containing oxide and a metal silicate. Aiming at the coking type of the LSW model, that is, a solution is medium-viscosity, the solubility of a solid phase in a liquid phase is relatively large, the solution is in a split-phase-emulsion state, and small particles are continuously dissolved to form a coking product which is settled and gathered, the hardness of the coking product is effectively reduced by compounding an aluminum-containing compound and a silicon-containing inhibitor, and the shape of the coking product is changed; original large slag blocks are changed into small slag blocks, and the thickness of a coke hanging body is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of boiler coking inhibition, and in particular to a coking inhibitor, a method for using the coking inhibitor, and an application thereof. 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 has plagued the industry. Boiler coking refers to the process in which the ash in the fuel melts at high temperature and adheres to the heating surface to form a hard coke body during the operation of the boiler. Boiler coking can cause many hazards, such as reducing the heat transfer efficiency of the boiler. Because the thermal conductivity of the coking layer is poor, the heat absorbed by the heating surface will be reduced, thereby affecting the steam production and quality. Moreover, severe coking may cause damage to the heating surface, such as causing local overheating and deformation of the pipeline or even bursting, increasing maintenance costs and downtime.

[0003] However, traditional coking inhibitors have the problem of poor stability of effect and cannot work well for different sintering types of coking, such as the sintering coking products formed by the LSW model. Summary of the invention

[0004] Based on this, the present application provides a coking inhibitor that can be used for sintering coking products formed by LSW models, a method for using the coking inhibitor, and an application.

[0005] The present application provides a coking inhibitor,

[0006] Wherein, the aluminum-containing compound includes one or two of activated alumina and bauxite;

[0007] The silicon-containing inhibitor includes a first silicon-containing compound and a second silicon-containing compound;

[0008] The first silicon-containing compound includes one or both of asbestos and serpentine;

[0009] The second silicon-containing compound includes one or both of silicon-containing oxide and metal silicate.

[0010] In one embodiment, the coking inhibitor comprises the aluminum-containing compound, the first silicon-containing compound and the silicon-containing oxide in a mass ratio of 1:(0.5-2):(0.5-2).

[0011] In one embodiment, the silicon-containing oxide satisfies one or both of the following conditions:

[0012] (1) The silicon-containing oxide includes one or more of silicon dioxide, microsilica powder, powdered quartz and fused quartz;

[0013] (2) The particle size of the silicon-containing oxide is 300 mesh to 8500 mesh.

[0014] In one embodiment, the coking inhibitor comprises the aluminum-containing compound, the first silicon-containing compound and the metal silicate in a mass ratio of 1:(0.5-2):(0.5-2).

[0015] In one embodiment, the metal silicate satisfies one or both of the following conditions:

[0016] (1) The metal silicate includes one or more of bentonite, montmorillonite and activated clay;

[0017] (2) The particle size of the metal silicate is 100 mesh to 350 mesh.

[0018] In one embodiment, the particle size of the aluminum-containing compound is 300 mesh to 600 mesh.

[0019] In one embodiment, the particle size of the first silicon-containing compound is 100 mesh to 500 mesh.

[0020] The present application also provides a method for using a coking inhibitor, comprising the following steps: adding the coking inhibitor described in any one of claims 1 to 7 into a coking body.

[0021] In one embodiment, the coking inhibitor and the fuel are added to the coke body in a mass ratio of (0.3~1):1000.

[0022] Furthermore, the present application provides the use of the above-mentioned coking inhibitor in treating coking in a furnace for incinerating industrial waste.

[0023] The present application is aimed at the coking type of the LSW model, that is, the solution has a medium viscosity, the solubility of the solid phase in the liquid phase is relatively large, and it is in a phase separation-emulsion state. The coking products formed by the continuous dissolution of small particles and the sedimentation and aggregation are compounded by aluminum-containing compounds and silicon-containing inhibitors to effectively reduce the hardness of the above-mentioned coking products, change the shape, and change the original large pieces of slag into small pieces of slag, thereby reducing the thickness of the coking body. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present application, 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.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. 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.

[0026] The term "and / or" used herein includes any one of two or more related listed items, and also includes any and all combinations of the related listed items, wherein the any and all combinations include any combination of two related listed items, any more related listed items, or all related listed items. For example, "A and / or B" includes three parallel solutions: A, B, and "a combination of A and B".

[0027] In this article, unless otherwise specified, "one or more" means any one of the listed items or any combination of the listed items. Similarly, "one or more" and other expressions that mean "one or more" are also understood in the same way unless otherwise specified.

[0028] In this document, "further", "further", "particularly", "for example", "such as", "example", "for example", etc. are used for descriptive purposes, indicating that the previous and subsequent technical solutions are related in terms of the content covered, but should not be understood as limiting the previous technical solution, nor can they be understood as limiting the scope of protection of this document. In this document, unless otherwise specified, A (such as B) means that B is a non-limiting example of A, and it can be understood that A is not limited to B.

[0029] Herein, "optionally", "optional", and "optional" mean optional, that is, any one of the two parallel schemes of "yes" or "no". If multiple "optional" items appear in a technical solution, unless otherwise specified and there is no contradiction or mutual restriction, each "optional" item is independent of each other. In this application, descriptions such as "optionally contain", "optionally include", etc. mean "contain or not contain". "Optional component X" means that component X exists or does not exist, or means that component X is contained or not contained.

[0030] In this document, the terms "first", "second", "third", "fourth", etc. in "the first aspect", "the second aspect", "the third aspect", "the fourth 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", 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.

[0031] In this article, 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.

[0032] Herein, when it comes to a numerical interval (i.e., a numerical range), unless otherwise specified, the distribution of the optional numerical values ​​within the numerical interval is considered to be continuous and includes the two numerical endpoints (i.e., the minimum and maximum values) of the numerical interval, and each numerical value between the two numerical endpoints. Unless otherwise specified, when a numerical interval only refers to integers within the numerical interval, including the two endpoint integers of the numerical range, and each integer between the two endpoints, is equivalent to directly listing each integer. When multiple numerical ranges are provided to describe features or characteristics, these numerical ranges can be combined. In other words, unless otherwise specified, the numerical ranges disclosed herein should be understood to include any and all sub-ranges included therein. The "numerical value" in the numerical interval can be any quantitative value, such as a number, a percentage, a ratio, etc. "Numerical interval" allows broadly including numerical interval types such as percentage intervals, ratio intervals, and ratio intervals.

[0033] Herein, the term "room temperature" or "normal temperature" generally refers to 4°C to 35°C, for example, 20°C ± 5°C. In some embodiments herein, "room temperature" or "normal temperature" refers to 10°C to 30°C. In some embodiments herein, "room temperature" or "normal temperature" refers to 20°C to 30°C.

[0034] In this article, if there are multiple steps involved in the method flow, unless there is a clear different description in this article, there is no strict order restriction for the execution of these steps, and they can be executed in other orders than described. Moreover, any step can include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn, alternating or simultaneously with other steps or parts of sub-steps or stages of other steps.

[0035] The present application provides a coking inhibitor, which comprises an aluminum-containing compound and a silicon-containing inhibitor in a mass ratio of 1:(1.5-3.5);

[0036] The aluminum-containing compound includes one or two of activated alumina and bauxite;

[0037] The silicon-containing inhibitor includes a first silicon-containing compound and a second silicon-containing compound;

[0038] The first silicon-containing compound includes one or both of asbestos and serpentine;

[0039] The second silicon-containing compound includes one or both of a silicon-containing oxide and a metal silicate.

[0040] Activated alumina is a porous, highly dispersed solid material with relatively stable chemical properties, and can maintain good performance within a certain temperature and pressure range.

[0041] Alumina includes Al2O3, SiO2, Fe2O3, and TiO2, accounting for about 95% of the total composition. Among them, Al2O3 is the most important component, and its main form is aluminum hydroxide and aluminum silicate, with a content generally between 45% and 80%; SiO2 generally exists in the form of clay minerals, which is inversely related to the Al2O3 content; Fe2O3 content is mostly between 1% and 1.5%; TiO2 content is generally 2% to 4%. It also includes CaO, MgO, K2O, Na2O, MnO2 and organic matter, and the content of these components is relatively low.

[0042] Asbestos is a general term for natural fibrous silicate minerals.

[0043] Serpentine is mainly composed of magnesium silicate, and its general chemical formula is Mg6[Si4O 10 ](OH)8.

[0044] The present application is aimed at the coking type of the LSW model, that is, the solution has a medium viscosity, the solubility of the solid phase in the liquid phase is relatively large, and it is in a phase separation-emulsion state. The coking products formed by the continuous dissolution of small particles and the sedimentation and aggregation are compounded by aluminum-containing compounds and silicon-containing inhibitors to effectively reduce the hardness of the above-mentioned coking products, change the shape, and change the original large pieces of slag into small pieces of slag, thereby reducing the thickness of the coking body.

[0045] Specifically, the coking inhibitor composition may include, but is not limited to, an aluminum-containing compound and a silicon-containing inhibitor in a mass ratio of 1:1.5, 1:2, 1:2.5, 1:3 or 1:3.5.

[0046] In a specific example, the composition of the coking inhibitor includes an aluminum-containing compound, a first silicon-containing compound, and a silicon-containing oxide in a mass ratio of 1:(0.5~2):(0.5~2).

[0047] In a specific example, silicon-containing oxides include one or more of silicon dioxide, microsilica powder, powdered quartz and fused quartz. Microsilica powder, also known as silica fume, is collected and processed by a special capture device during the high-temperature smelting of industrial silicon and ferrosilicon in an industrial electric furnace. The main component is silicon dioxide, which generally contains about 85% to 98%. Powdered quartz is a naturally produced quartz powder ore. The main component is silicon dioxide, with a high purity, generally greater than 98%. Fused quartz is formed by melting quartz raw materials at high temperatures, and its main component is silicon dioxide.

[0048] In a specific example, the particle size of the silicon-containing oxide is 300 mesh to 8500 mesh.

[0049] It can be understood that the composition of the coking inhibitor includes the aluminum-containing compound, the first silicon-containing compound and the silicon-containing oxide in a mass ratio of 1:(0.5~2):(0.5~2).

[0050] Further, the particle size of silicon dioxide is 400 mesh to 800 mesh. Specifically, the particle size of silicon dioxide can be but not limited to 400 mesh, 500 mesh, 600 mesh, 700 mesh or 800 mesh. The particle size of microsilica is 6000 mesh to 8500 mesh. Specifically, the particle size of microsilica can be but not limited to 6000 mesh, 6500 mesh, 7000 mesh, 7500 mesh, 8000 mesh or 8500 mesh. The particle size of powdered quartz is 300 mesh to 500 mesh, and the particle size of powdered quartz can be but not limited to 300 mesh, 325 mesh, 350 mesh, 375 mesh, 400 mesh, 425 mesh, 450 mesh, 475 mesh or 500 mesh. The particle size of the fused quartz is 300 mesh to 500 mesh. The particle size of the fused quartz can be, but is not limited to, 300 mesh, 325 mesh, 350 mesh, 375 mesh, 400 mesh, 425 mesh, 450 mesh, 475 mesh or 500 mesh.

[0051] The above formula has a better effect on treating coking on the side wall of the furnace of the furnace body for incinerating industrial waste. Specifically, when the Ca content in the coking body is greater than 20%, after adding the coking inhibitor, the apparent properties of the coking body change significantly, including color change, reduced hardness, loose structure, from hard and unbreakable to brittle, shape change, from large pieces of slag to small pieces of slag, and the thickness of the coking body on the side wall of the furnace decreases.

[0052] In a specific example, the composition of the coking inhibitor includes an aluminum-containing compound, a first silicon-containing compound, and a metal silicate in a mass ratio of 1:(0.5~2):(0.5~2).

[0053] In a specific example, the metal silicate includes one or more of bentonite, montmorillonite and activated clay. Bentonite is clay or clay rock with montmorillonite as the main mineral component, and the main component is montmorillonite, and also contains a small amount of impurities such as feldspar and quartz. Montmorillonite is a hydrated layered aluminum silicate mineral with a chemical formula of E x (H2O)4{(Al 2-x Mg x )2[(Si,Al)4O 10 ](OH)2}, where E is the interlayer exchangeable cation, mainly Na + , Ca 2+ , followed by K + , Li +Activated clay is an adsorbent obtained by using bentonite as raw material and undergoing inorganic acid treatment. The main component is the product of acid activation of clay minerals such as montmorillonite.

[0054] In a specific example, the particle size of the metal silicate is 100 mesh to 350 mesh. Specifically, the particle size of the metal silicate can be, but is not limited to, 100 mesh, 150 mesh, 200 mesh, 250 mesh, 300 mesh or 350 mesh.

[0055] The above formula has a better effect on treating the coking of the front arch and rear arch of the furnace body of the furnace body for incinerating industrial waste. Specifically, the Ca content in the coking body is>20%. According to the observation of the fire viewing hole, during the test, the growth rate of the coke block slowed down; the thickness became thinner (it was observed that the coking thickness of the rear arch became 1 / 4 of the original, and the coking thickness of the front arch was reduced to 1 / 3 of the original); during the addition of the coking inhibitor, the coking fell off in small pieces, which would not affect normal operation, and the fallen slag became loose and fragile compared to before the test.

[0056] In a specific example, the particle size of the aluminum-containing compound is 300 mesh to 600 mesh. Specifically, the particle size of the aluminum-containing compound can be, but is not limited to, 300 mesh, 350 mesh, 400 mesh, 450 mesh, 500 mesh, 500 mesh or 600 mesh.

[0057] In a specific example, the particle size of the first silicon-containing compound is 100 mesh to 500 mesh. Specifically, the particle size of the first silicon-containing compound may be, but is not limited to, 100 mesh, 150 mesh, 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh or 500 mesh.

[0058] The present application also provides a method for using a coking inhibitor, comprising the following steps: adding any of the above coking inhibitors into a coked body.

[0059] In a specific example, the mass ratio of the amount of coking inhibitor added to the fuel is (0.3~1):1000. It can be understood that the coking inhibitor is sprayed into the coking body by compressed air, wherein the mass ratio of the amount of coking inhibitor added to the fuel is (0.3~1):1000. Further, the mass ratio of the amount of coking inhibitor added to the fuel may be, but is not limited to, 0.3:1000, 0.4:1000, 0.5:1000, 0.6:1000, 0.7:1000, 0.8:1000, 0.9:1000 or 1:1000. The above-mentioned fuel may be, but is not limited to, one or more of coal, mineral material and garbage, for example, coal burning means that the fuel is coal, metallurgical furnace means that the fuel is mineral material, and garbage incinerator means that the fuel is garbage.

[0060] Furthermore, the present application provides the use of the above-mentioned coking inhibitor in treating coking in a furnace for incinerating industrial waste.

[0061] 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 illustrate 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 such as 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 an example 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.

[0062] Bauxite was purchased from Gongyi Phoenix Refractory Material Factory with a particle size of 325 mesh; activated alumina was purchased from Chalco Shandong Co., Ltd. with a particle size of 400 mesh; serpentine was purchased from Jiangxi Yiyang Central Asia Mining Co., Ltd. with a particle size of 200 mesh; asbestos was purchased from Dunhuang Senxin Mining Co., Ltd. with a particle size of 400 mesh; silicon dioxide was purchased from Yifeng Mining Technology (Dongyuan) Co., Ltd. with a particle size of 600 mesh; microsilica was purchased from Chengdu Donglanxing Technology Development Co., Ltd. with a particle size of 8000 mesh; powder quartz was purchased from Majiang Jingfa Mining Co., Ltd. with a particle size of 325 mesh; fused quartz was purchased from Lianyungang Hongding Quartz Co., Ltd. with a particle size of 400 mesh; bentonite was purchased from Gansu Hongquan Bentonite Co., Ltd. with a particle size of 200 mesh; montmorillonite was purchased from Inner Mongolia Ningcheng Tianyu Bentonite Technology Co., Ltd. with a particle size of 325 mesh; activated clay was purchased from Huangshan Baiyue Activated Clay Co., Ltd. with a particle size of 325 mesh.

[0063] Example 1

[0064] The coking inhibitor provided in this embodiment comprises alumina, serpentine and silicon dioxide in a mass ratio of 1:1:1. The above raw materials are prepared and put into a mixer for uniform mixing.

[0065] The formulas of other embodiments and comparative examples are shown in Table 1 below. The preparation method is the same as that of Example 1. The coking inhibitors and fuel of the above embodiments and comparative examples are sprayed to the coking body in the coking area of ​​the furnace of a power plant burning industrial waste by compressed air at a ratio of 0.5:1000. The coking thickness in the table is the thickness data recorded in the furnace two days after the coking inhibitors of each embodiment and comparative example are added respectively. The smaller the coking thickness, the better the coking inhibition effect. It can be understood that the difference between each embodiment and comparative example is only the composition of the coking inhibitor.

[0066] Table 1

[0067]

[0068] The Ca content in the coke body of the furnace body for incinerating industrial waste is >20%. After adding the coke inhibitor, the apparent properties of the coke body change significantly, including color change, reduced hardness, loose structure, from hard and unbreakable to brittle, shape change, from large pieces of slag to small pieces of slag, and the thickness of the coke body hanging on the side wall of the furnace decreases. According to the observation of the fire viewing hole, during the test, the growth rate of the coke block slowed down; the thickness became thinner (it was observed that the thickness of the coke hanging on the rear arch became 1 / 4 of the original, and the thickness of the coke hanging on the front arch decreased to 1 / 3 of the original); during the addition of the coke inhibitor, the coke fell off in small pieces, which would not affect normal operation, and the fallen slag became loose and brittle compared to before the test.

[0069] 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.

[0070] 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 inhibitor, characterized in that: The composition includes an aluminum-containing compound and a silicon-containing inhibitor in a mass ratio of 1:(1.5-3.5); Wherein, the aluminum-containing compound includes one or two of activated alumina and bauxite; The silicon-containing inhibitor includes a first silicon-containing compound and a second silicon-containing compound; The first silicon-containing compound includes one or both of asbestos and serpentine; The second silicon-containing compound includes one or both of silicon-containing oxide and metal silicate.

2. The coking inhibitor according to claim 1, characterized in that The coking inhibitor comprises the aluminum-containing compound, the first silicon-containing compound and the silicon-containing oxide in a mass ratio of 1:(0.5-2):(0.5-2).

3. The coking inhibitor according to claim 2, characterized in that The silicon-containing oxide satisfies one or both of the following conditions: (1) The silicon-containing oxide includes one or more of silicon dioxide, microsilica powder, powdered quartz and fused quartz; (2) The particle size of the silicon-containing oxide is 300 mesh to 8500 mesh.

4. The coking inhibitor according to claim 1, characterized in that The coking inhibitor comprises the aluminum-containing compound, the first silicon-containing compound and the metal silicate in a mass ratio of 1:(0.5-2):(0.5-2).

5. The coking inhibitor according to claim 4, characterized in that The metal silicate satisfies one or both of the following conditions: (1) The metal silicate includes one or more of bentonite, montmorillonite and activated clay; (2) The particle size of the metal silicate is 100 mesh to 350 mesh.

6. The coking inhibitor according to any one of claims 1 to 5, characterized in that The particle size of the aluminum-containing compound is 300 mesh to 600 mesh.

7. The coking inhibitor according to any one of claims 1 to 5, characterized in that The particle size of the first silicon-containing compound is 100 mesh to 500 mesh.

8. A method for using a coking inhibitor, characterized in that: The method comprises the following steps: adding the coking inhibitor according to any one of claims 1 to 7 into the coking body.

9. The method of use according to claim 8, characterized in that: The coking inhibitor and the fuel are added into the coke body in a mass ratio of (0.3-1):1000.

10. Use of the coking inhibitor according to any one of claims 1 to 7 in treating coking in a furnace for incinerating industrial waste.

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