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 the following components in percentage by mass: 60-70% of a first component and 30-40% of a second component, wherein the first component comprises one or two of aluminosilicate mineral and talc; the aluminosilicate-containing minerals comprise one or more of bentonite, montmorillonite and activated clay; the second component comprises one or more of chlorite, magnesium oxide, sodium chloride and aluminum oxide. Aiming at a viscous flow mechanism, particularly a coking product which is low in system viscosity, short in material property and formed by sedimentation due to colloid particle entanglement caused by electrolyte, the first component and the second component which are specifically selected and proportionally are compounded, so that the coking condition to be formed is effectively controlled, the size of formed coke blocks is reduced, and the coking balance is kept.

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 types of sintering coke, such as sintering coke products formed by viscous flow mechanism. Summary of the invention

[0004] Based on this, the present application provides a coking inhibitor that can be used for sintered coking products formed by a viscous flow mechanism, a method for using the coking inhibitor, and an application thereof.

[0005] The present application provides a coking inhibitor, which comprises, by mass percentage, 60% to 70% of a first component and 30% to 40% of a second component;

[0006] Wherein, the first component includes one or two of aluminum silicate minerals and talc;

[0007] The aluminum silicate minerals include one or more of bentonite, montmorillonite and activated clay;

[0008] The second component includes one or more of chlorite, magnesium oxide, sodium chloride and aluminum oxide.

[0009] In one embodiment, the composition of the coking inhibitor includes 65% to 70% of the first component and 30% to 35% of the chlorite by mass.

[0010] In one embodiment, the composition of the coking inhibitor includes 65% to 70% of the first component and 30% to 35% of the magnesium oxide by mass percentage.

[0011] In one embodiment, the coking inhibitor comprises, by mass percentage, 65% to 70% of the first component and 30% to 35% of the alumina.

[0012] In one embodiment, the first component includes the aluminum silicate mineral and the talc in a mass ratio of 1:(0.8-1.2).

[0013] In one embodiment, the composition of the coking inhibitor includes, by mass percentage, 60% to 70% of the aluminum silicate mineral, 15% to 30% of the chlorite, and 5% to 20% of the sodium chloride.

[0014] In one embodiment, one or more of the following conditions are met:

[0015] (1) The particle size of the aluminum silicate mineral is 150 mesh to 350 mesh;

[0016] (2) The particle size of the talc is 600-900 mesh;

[0017] (3) The particle size of the second component is 50 mesh to 650 mesh.

[0018] The present application also provides a method for using a coking inhibitor, comprising the following steps: adding the above-mentioned coking inhibitor into a coked body.

[0019] Furthermore, the present application provides the use of the above-mentioned coking inhibitor in treating coking in a furnace of incinerating domestic waste.

[0020] Furthermore, the present application provides the use of the above-mentioned coking inhibitor in treating coking in the ascending flue of a metallurgical furnace.

[0021] The present application targets the viscous flow mechanism, specifically the low viscosity of the system, the short material property, and the coking products formed by the entanglement of colloidal particles caused by the electrolyte and the sedimentation. By compounding the first component and the second component in a specific selection and proportion, the coking that is about to be formed is effectively controlled, the size of the coke blocks that have been formed is reduced, and the coking balance is maintained. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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".

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] The present application provides a coking inhibitor, which comprises, by mass percentage, 60% to 70% of a first component and 30% to 40% of a second component;

[0034] Wherein, the first component includes one or two of aluminum silicate minerals and talc;

[0035] Aluminum silicate minerals include one or more of bentonite, montmorillonite and activated clay;

[0036] The second component includes one or more of chlorite, magnesium oxide, sodium chloride and aluminum oxide.

[0037] The present application targets the viscous flow mechanism, specifically the low viscosity of the system, the short material property, and the coking products formed by the entanglement of colloidal particles caused by the electrolyte and the sedimentation. By compounding the first component and the second component in a specific selection and proportion, the coking that is about to be formed is effectively controlled, the size of the coke blocks that have been formed is reduced, and the coking balance is maintained.

[0038] Bentonite is a clay rock, also known as montmorillonite clay rock, which often contains a small amount of illite, kaolinite, halloysite, chlorite, zeolite, quartz, feldspar, calcite, etc. It is generally white or light yellow, and due to the change of iron content, it can be light gray, light green, pink, brown red, brick red, gray black, etc. It has a waxy, earthy or greasy luster. Some bentonites are loose like soil, while others are dense and hard. The main chemical components are silicon dioxide, aluminum oxide and water, and also contain iron, magnesium, calcium, sodium, potassium and other elements. The content of Na2O and CaO has a great influence on the physical and chemical properties and process performance of bentonite.

[0039] Montmorillonite is a layered mineral composed of extremely fine particles of hydrous aluminum silicate, also known as colloid stone and microcrystalline kaolinite. It is the main component of bentonite formed by the alteration of igneous rocks such as volcanic concretion in an alkaline environment. Montmorillonite belongs to the monoclinic system, TOT type, and dioctahedral structure. Molecular formula 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 + Montmorillonite is mainly formed by the weathering of basic igneous rocks in an alkaline environment, and some are the decomposition products of volcanic ash deposited on the seabed.

[0040] Activated white clay is an adsorbent made from clay (mainly bentonite) as raw material, treated with inorganic acid, rinsed with water and dried. It is a milky white powder, odorless, tasteless, non-toxic, with strong adsorption properties, and can adsorb colored and organic substances.

[0041] Talc is a trioctahedral mineral with the structural formula (Mg6)[Si8]O 20 (OH)4.

[0042] Chlorite can be expressed as Y3[Z4O 10 ](OH)2·Y3(OH)6, a general term for a family of layered sodium chloride silicate minerals with monoclinic, triclinic or orthorhombic crystal systems. In the chemical formula, Y mainly represents Mg 2+ , Fe 2+ 、Al 3+ and Fe3+ In some mineral species (such as nickel chlorite, manganese chlorite, lithium borate chlorite, etc.), it can also be Cr, Ni, Mn, V, Cu or Li; Z is mainly Si and Al, and occasionally Fe 3+ or B 3+ However, the so-called chlorite usually refers to the mineral species mainly composed of Mg and Fe, namely, clinochlore, oolite, etc. 2+ :R 2+ The differences in (divalent cation) ratios and the number of Si atoms further lead to subspecies such as chlorochlore and lepidolite.

[0043] In a specific example, the composition of the coking inhibitor includes 65% to 70% of the first component and 30% to 35% of chlorite in terms of mass percentage. The first component includes an aluminum silicate mineral and talc in a mass ratio of 1:(0.8 to 1.2).

[0044] Specifically, the first component includes, but is not limited to, an aluminum silicate mineral and talc in a mass ratio of 1:0.8, 1:0.9, 1:1, 1:1.1 or 1:1.2.

[0045] Furthermore, the composition of the coking inhibitor includes, by mass percentage, 30% to 35% of aluminum silicate minerals, 30% to 35% of talc, and 30% to 35% of chlorite.

[0046] In a specific example, the composition of the coking inhibitor includes 65% to 70% of the first component and 30% to 35% of magnesium oxide by mass percentage. The first component includes an aluminum silicate mineral and talc in a mass ratio of 1: (0.8 to 1.2). It can be understood that the magnesium oxide here can be not limited to ordinary magnesium oxide but also active magnesium oxide.

[0047] Specifically, the first component includes, but is not limited to, an aluminum silicate mineral and talc in a mass ratio of 1:0.8, 1:0.9, 1:1, 1:1.1 or 1:1.2.

[0048] Furthermore, the composition of the coking inhibitor includes, by mass percentage, 30% to 35% of an aluminum silicate mineral, 30% to 35% of talc, and 30% to 35% of magnesium oxide.

[0049] In a specific example, the composition of the coking inhibitor includes 65% to 70% of the first component and 30% to 35% of alumina by mass percentage. The first component includes an aluminum silicate mineral and talc in a mass ratio of 1: (0.8 to 1.2). It can be understood that the alumina here may not be limited to one or both of activated alumina and bauxite.

[0050] Specifically, the first component mentioned above may include, but is not limited to, an aluminum silicate mineral and talc in a mass ratio of 1:0.8, 1:0.9, 1:1, 1:1.1 or 1:1.2.

[0051] Furthermore, the composition of the coking inhibitor includes, by mass percentage, 30% to 35% of aluminum-containing silicate minerals, 30% to 35% of talc, and 30% to 35% of aluminum oxide.

[0052] In a specific example, the composition of the coking inhibitor includes, by mass percentage, 60% to 70% of aluminum silicate minerals, 15% to 30% of chlorite, and 5% to 20% of sodium chloride.

[0053] In a specific example, the particle size of the aluminum silicate mineral is 150 mesh to 350 mesh. Specifically, the particle size of the aluminum silicate mineral can be, but is not limited to, 150 mesh, 200 mesh, 250 mesh, 300 mesh or 350 mesh.

[0054] In a specific example, the particle size of the talc is 600-900 mesh. Specifically, the particle size of the talc can be, but is not limited to, 650 mesh, 700 mesh, 750 mesh, 800 mesh, 850 mesh or 900 mesh.

[0055] In a specific example, the particle size of the second component is 50 mesh to 650 mesh. Specifically, the particle size of chlorite is 500 mesh to 650 mesh, which may be but is not limited to 500 mesh, 550 mesh, 600 mesh or 650 mesh. The particle size of magnesium oxide is 300 mesh to 400 mesh, which may be but is not limited to 300 mesh, 325 mesh, 350 mesh, 375 mesh or 400 mesh. The particle size of sodium chloride is 50 mesh to 150 mesh, which may be but is not limited to 50 mesh, 75 mesh, 100 mesh, 125 mesh or 150 mesh. The particle size of aluminum oxide is 300 mesh to 450 mesh, which may be but is not limited to 300 mesh, 325 mesh, 350 mesh, 375 mesh or 400 mesh.

[0056] The present application also provides a method for using a coking inhibitor, comprising the following steps: adding the above-mentioned coking inhibitor into a coked body.

[0057] It can be understood that the coking inhibitor is sprayed into the coke body by compressed air, and specifically the coking inhibitor and the fuel are sprayed into the coke body by compressed air, wherein the mass ratio of the amount of the coking inhibitor added to the fuel is (0.3~1):1000. Further, the mass ratio of the amount of the coking inhibitor added to the fuel can 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 fuel can 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.

[0058] Furthermore, the present application provides the use of the above-mentioned coking inhibitor in treating coking in a furnace of incinerating domestic waste.

[0059] Furthermore, the present application provides the use of the above-mentioned coking inhibitor in treating coking in the ascending flue of a metallurgical furnace.

[0060] Specifically, the metallurgical furnace uptake flue may be, but is not limited to, the uptake flue of a metal smelting plant or the uptake flue of a precious metal anode mud side-blowing reduction furnace.

[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] Alumina 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; chlorite was purchased from Haicheng Hetai Powder Technology Co., Ltd. with a particle size of 600 mesh; talc was purchased from Haicheng Chengxin Micro-fine Stone Powder Factory with a particle size of 800 mesh; sodium chloride was purchased from Huangshi Jiangnan Chemical Raw Materials Co., Ltd. with a particle size of 100 mesh; magnesium oxide was purchased from Haicheng Lisheng Mining Co., Ltd. with a particle size of 325 mesh; activated magnesium oxide was purchased from Hebei Meishen Technology Co., Ltd. with a particle size of 500 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 white clay was purchased from Huangshan Baiyue Activated White Clay Co., Ltd. with a particle size of 325 mesh; calcium chloride was purchased from Wuhan Tianhui Chemical Co., Ltd. with a particle size of 100 mesh.

[0063] Example 1

[0064] The composition of the scorch inhibitor provided in this embodiment includes 33.33% by mass of bentonite, 33.33% by mass of chlorite and 33.33% by mass of talc. The above raw materials are prepared and put into a mixer for uniform mixing.

[0065] The formulas and corresponding effects of other embodiments and comparative examples are shown in Tables 1 and 2 below. The preparation method is the same as that of Example 1. The coking inhibitors and fuels of the above embodiments and comparative examples are sprayed to the coke bodies in the ascending flue of the metallurgical furnace and the furnace of the power plant for burning domestic waste by compressed air at a mass ratio of 0.5:1000. It can be understood that the difference between the embodiments and comparative examples is only the composition of the coking inhibitors.

[0066] The data in the ascending flue of the Ge Copper Smelter in Table 1 and Table 2 specifically refer to the coking thickness corresponding to the operation cycle of the ascending flue. The longer the operation cycle and the smaller the coking thickness formed, the better the effect. For the coking thickness in the coking test of the side walls and rear arches of the furnace of the domestic waste power plant, the coking inhibitors of each embodiment and the comparative example were added respectively, and the thickness data in the furnace was recorded two days later. The smaller the coking thickness, the better the coking inhibition effect. For the operation cycle of the ascending flue of the side-blown reduction furnace of precious metal anode mud and the cleaning time required in the corresponding operation cycle. The longer the operation time but the shorter the time required for cleaning, the better the effect of the coking inhibitor.

[0067] Table 1

[0068]

[0069] Table 2

[0070]

[0071] The coking inhibitor provided by this application targets the coking in the ascending flue of a copper smelter, which generally contains a high amount of Cu, with a Cu content of up to 72%. The operating cycle before the test was only 4 days, and the furnace was shut down for cleaning because the coking in the ascending flue affected the flue gas circulation. The coking thickness was about 45 cm, and a scaffold had to be set up for cleaning each time, which posed a very high safety risk. After adding the coking inhibitor of this application, the coking condition continued to improve, and the coking in the ascending flue was gradually removed. The wall originally covered with coking became clean, with only a small amount of coking remaining. Basically, the furnace would not be shut down due to the coking problem here, which greatly improved the production efficiency.

[0072] The coking inhibitor provided by the present application is used to treat the coking of the furnace side wall of the grate furnace waste power plant that incinerates domestic waste. Before the test, the furnace side wall had a lot of coking, with a thickness of 800~100cm, and material blocking often occurred, seriously affecting the operation. During the test process after adding the coking inhibitor of the present application, the coke block has maintained a trend of gradually becoming smaller, maintaining the coking balance (increasing and then falling off).

[0073] The coking inhibitor provided by the present application is aimed at treating the coking at the rear arch of the furnace of a grate furnace waste power plant that incinerates domestic waste. The coking problem at the rear arch of the furnace is serious, causing the coke blocks to fall as a whole, resulting in grate failure, and often requiring fire suppression and furnace shutdown for treatment. During the test after adding the coking inhibitor of the present application, it was observed from the fire viewing hole that the coke blocks became smaller and no large pieces of coke fell.

[0074] The coking inhibitor provided by this application is aimed at the coking of the ascending flue of the side-blown reduction furnace for precious metal anode mud. Before the test, the coking from the furnace mouth to the ascending flue was serious, and the furnace was generally shut down for cleaning after 7 days of operation due to the small flue gas flow cross-section. After adding the product, it was in good condition after 28 days of operation. Only a small amount of coking of about 30 centimeters was found on the north side, and there was basically no coking on the other three sides. This shows that the addition of the coking inhibitor of this application effectively controls the coking at this location, greatly prolongs the operation cycle, and reduces the safety risks caused by coking cleaning.

[0075] 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.

[0076] 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 60% to 70% of the first component and 30% to 40% of the second component by mass percentage; Wherein, the first component includes one or two of aluminum silicate minerals and talc; The aluminum silicate minerals include one or more of bentonite, montmorillonite and activated clay; The second component includes one or more of chlorite, magnesium oxide, sodium chloride and aluminum oxide.

2. The coking inhibitor according to claim 1, characterized in that The composition of the coking inhibitor includes, by mass percentage, 65% to 70% of the first component and 30% to 35% of the chlorite.

3. The coking inhibitor according to claim 1, characterized in that The composition of the coking inhibitor includes, by mass percentage, 65% to 70% of the first component and 30% to 35% of the magnesium oxide.

4. The coking inhibitor according to claim 1, characterized in that The coking inhibitor comprises, by mass percentage, 65% to 70% of the first component and 30% to 35% of the alumina.

5. The coking inhibitor according to any one of claims 2 to 4, characterized in that The first component includes the aluminum silicate mineral and the talc in a mass ratio of 1:(0.8-1.2).

6. The coking inhibitor according to claim 1, characterized in that The composition of the coking inhibitor includes, by mass percentage, 60% to 70% of the aluminum silicate mineral, 15% to 30% of the chlorite, and 5% to 20% of the sodium chloride.

7. The coking inhibitor according to any one of claims 1 to 4 and 6, characterized in that One or more of the following conditions are met: (1) The particle size of the aluminum silicate mineral is 150 mesh to 350 mesh; (2) The particle size of the talc is 600-900 mesh; (3) The particle size of the second component is 50 mesh to 650 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. Use of the coking inhibitor according to any one of claims 1 to 7 in treating coking in a furnace of incinerating domestic waste.

10. Use of the coking inhibitor according to any one of claims 1 to 7 in treating coking in the ascending flue of a metallurgical furnace.

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