Boiler coking inhibitor, preparation method thereof and method for inhibiting boiler coking

Abstract

The invention relates to the technical field of chemical materials, in particular to a boiler coking inhibitor, a preparation method thereof and a method for inhibiting boiler coking. The boiler coking inhibitor comprises the following components in percentage by mass: 40%-70% of an aluminum-containing mineral component, 15%-30% of chlorite, 0-30% of a silicon-containing mineral component and 0%-20% of an iron-containing component, the silicon-containing mineral component and the iron-containing component are not 0 at the same time; the aluminum-containing mineral component is selected from at least one of calcined alumina, raw alumina, activated alumina, aluminum hydroxide and rho-type aluminum oxide; the silicon-containing mineral component comprises at least one of silicon dioxide powder, silica fume and quartz powder; the iron-containing component comprises at least one of reduced iron powder and iron oxide. The boiler coking inhibitor has the advantages of being low in cost, convenient to use and safe, and the problems of boiler coking and ash deposition can be effectively solved.

Description

Technical Field

[0001] The invention relates to the technical field of chemical materials, and in particular to a boiler coking inhibitor and a preparation method thereof, and a method for inhibiting boiler coking. 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. The coking problem is particularly prominent during the boiler combustion process. Coking not only affects the normal operation of the boiler and reduces combustion efficiency, but may also cause safety accidents. Traditional solutions include improving boiler design to optimize combustion methods and improve fuel quality, but this method has poor flexibility and is not suitable for boiler systems that have already been built and are difficult to transform on a large scale.

[0003] Spraying coking inhibitors into the coking area of ​​the boiler is a quick, flexible and effective way to solve the boiler coking problem. There are many decoking agents on the market, including nitrates and copper-based and magnesium-based products. They inhibit coking by catalyzing combustion, increasing melting point, micro-explosion, drying adhesives and other mechanisms, but these decoking agents also have many limitations, such as being corrosive to boilers, high cost or ineffective.

[0004] Therefore, developing an efficient, stable and low-cost coking inhibitor is of great significance for solving the boiler coking problem. Summary of the invention

[0005] The purpose of the present application is to provide a coking inhibitor which is low in cost, easy to use, safe, and can effectively improve the problem of boiler coking and ash accumulation. Further, a preparation method of a boiler coking inhibitor and a method for inhibiting boiler coking are provided.

[0006] In a first aspect, the present application provides a boiler coking inhibitor, which comprises the following components, calculated by mass percentage: 40% to 70% of an aluminum-containing mineral component, 15% to 30% of chlorite, 0% to 30% of a silicon-containing mineral component, and 0% to 20% of an iron-containing component; the silicon-containing mineral component and the iron-containing component are not both 0;

[0007] The aluminum-containing mineral component is selected from at least one of smelted alumina, raw alumina, activated alumina, aluminum hydroxide and p-type alumina;

[0008] The silicon-containing mineral component includes at least one of silicon dioxide powder, microsilica powder and quartz powder;

[0009] The iron-containing component includes at least one of reduced iron powder and iron oxide.

[0010] The above-mentioned boiler coking inhibitor includes aluminum mineral components, chlorite, silicon-containing mineral components and iron-containing components of specific components and proportions. Among them, chlorite minerals have high surface chemical activity and good dispersibility in the system. They can absorb the molten liquid phase components in the coke and penetrate into the interior of the coke body through capillary action to produce swelling. The content of aluminum oxide in slaked alumina, raw alumina, activated alumina, etc. is very high. Aluminum hydroxide can also be converted into aluminum oxide components under high temperature conditions, and cooperate with other components such as silicon dioxide, silicon micropowder with a high silicon dioxide content in the main component, microsilica powder and quartz powder components to form high-melting-point compounds at high temperatures, thereby effectively increasing the ash melting point and reducing the melting of slag. Furthermore, iron oxides mainly play a flocculation and dispersion role in the system, weakening the aggregation between particles that aggregate and settle due to van der Waals forces, forming a loose flocculent structure, and evenly dispersed in the system; they can also adsorb and fix the alkali metals in the coke, reducing their reactivity at high temperatures, which helps to reduce the reaction of alkali metals with other components in the slag, thereby inhibiting the formation of coke; iron oxides also have strong permeability, which can promote other components in the coke inhibitor to penetrate into the slag to participate in the reaction, improve the reaction efficiency, and crystallize to make the slag easy to fall off. In short, the present invention combines the unique physical and chemical effects of various minerals to formulate a specific ratio in a specific way, produce a synergistic effect, and have a good coke inhibition effect.

[0011] In addition, the present invention uses cheap minerals as raw materials, has low cost, does not release toxic or harmful gases during use, is green and environmentally friendly, and does not cause excessive emissions.

[0012] In some embodiments, the boiler coking inhibitor satisfies at least one of the following conditions:

[0013] (1) The average particle size of the aluminum-containing mineral component is 400 mesh to 600 mesh;

[0014] (2) The average particle size of the chlorite is 500-800 mesh;

[0015] (3) The average particle size of the silicon-containing mineral component is 300 mesh to 8000 mesh;

[0016] (4) The average particle size of the iron-containing component is 200 mesh to 600 mesh.

[0017] In some embodiments, the following components are included, calculated by mass percentage: 55% to 70% of the aluminum-containing mineral component, 15% to 25% of chlorite, and 15% to 30% of the silicon-containing mineral component.

[0018] In some embodiments, the following components are included, calculated by mass percentage: 55% to 70% of the aluminum-containing mineral component, 15% to 25% of chlorite, and 5% to 20% of the iron-containing component.

[0019] In some embodiments, the composition comprises the following components by weight percentage: 55% to 65% calcine, 20% to 25% chlorite and 15% to 25% silicon dioxide; or,

[0020] Calculated by mass percentage, it includes the following components: 65%~70% slaked alumina, 18%~25% chlorite and 8%~12% iron oxide.

[0021] In some embodiments, the iron oxide is ferric oxide.

[0022] In some embodiments, the boiler coking inhibitor is a powder; the average particle size of the boiler coking inhibitor is 300 mesh to 500 mesh.

[0023] A second aspect of the present application provides a method for preparing a boiler coking inhibitor, comprising the following steps: configuring raw materials according to the boiler coking inhibitor components described in the first aspect, and uniformly mixing the raw materials to obtain the boiler coking inhibitor.

[0024] The third aspect of the present application provides a method for inhibiting boiler coking, comprising the following steps:

[0025] During the operation of the boiler, the boiler coking inhibitor described in the first aspect is sprayed into the boiler coking area.

[0026] In some embodiments, the mass ratio of the added amount of the boiler coking inhibitor to the ore to be smelted in the boiler is (0.3~1):1000. DETAILED DESCRIPTION

[0027] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. It should be understood that the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] 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 invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] Where “including,” “having,” and “comprising” are used herein, it is intended to cover a non-exclusive inclusion, and another component / component may also be added unless explicit limiting terms such as “only,” “consisting of,” etc. are used.

[0030] In the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0031] The words "preferably", "more preferably", "preferably", "better", etc. in the present invention refer to embodiments of the present invention that can provide certain beneficial effects in certain circumstances. However, other embodiments may also be preferred under the same circumstances or other circumstances. In addition, the statement of one or more preferred embodiments does not imply that other embodiments are not applicable, nor is it intended to exclude other embodiments from the scope of the present invention. That is, in the present invention, "preferably", "more preferably", "preferably", "better", etc. are only used to describe implementation methods or examples with better effects, but do not constitute a limitation on the scope of protection of the present invention.

[0032] In the present invention, “further”, “furthermore”, “particularly”, etc. are used for descriptive purposes to indicate differences in content, but should not be construed as limiting the scope of protection of the present invention.

[0033] When a numerical range is disclosed in the present invention, the above range is considered to be continuous and includes the minimum and maximum values ​​of the range, as well as each value between such minimum and maximum values. Further, when the range refers to an integer, each integer between the minimum and maximum values ​​of the range is included. In addition, when multiple ranges are provided to describe features or characteristics, the range can be merged. In other words, unless otherwise specified, all ranges disclosed herein should be understood to include any and all sub-ranges included therein. And only some numerical ranges are specifically disclosed herein. However, any lower limit can be combined with any upper limit to form an unambiguous range; and any lower limit can be combined with other lower limits to form an unambiguous range, and any upper limit can also be combined with any other upper limit to form an unambiguous range. In addition, each individually disclosed point or single value itself can be combined with any other point or single value as a lower limit or upper limit or with other lower limits or upper limits to form an unambiguous range.

[0034] The weights of the relevant components mentioned in the embodiments of the present invention description may not only refer to the specific content of each component, but also indicate the weight ratio between the components. Therefore, as long as the content of the relevant components in the embodiments of the present invention description is proportionally enlarged or reduced, it is within the scope disclosed in the embodiments of the present invention description. Specifically, the weights described in the embodiments of the present invention description may be mass units known in the chemical industry such as μg, mg, g, and kg.

[0035] In the present invention, “above” or “below” both include the number itself, for example, below 1 means less than or equal to 1 (≤1), and above 1 means greater than or equal to 1 (≥1).

[0036] Boiler coking refers to the process in which the ash in the ore to be smelted melts at high temperatures and adheres to the heating surface during the operation of the smelting boiler, forming a hard coke. This will not only reduce the thermal efficiency of the boiler, but also increase 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. Boiler coking inhibitor is a chemical agent used to prevent coking inside the boiler. However, the preparation cost of some highly efficient coking inhibitors is high, which increases the cost burden of boiler operation, especially when used on a large scale. The high cost may limit the promotion and use of inhibitors. There are also some coking inhibitors that may produce substances harmful to the environment during use, or increase the difficulty of treating emissions during use. This is inconsistent with the current requirements of environmental protection and sustainable development, and it is necessary to find more environmentally friendly alternatives.

[0037] This application re-recognizes and explains the formation mechanism and development process of boiler coking and ash accumulation. It is believed that the coking process has three stages: initial deposition, deposition growth, and deposition solidification, which are mainly affected by the adhesion tendency of the impacting particles and the capture ability of the deposition surface. Coking is essentially the result of the interaction between the adhesive (melt) and the particles. This interaction is the result of the combined force formed by the mutual dominance of the following three forces: the action between particles and melts, the interaction between particles, and the interaction between melts. Among these forces, the liquid bridge force plays a leading role. It is the adhesion force caused by the negative pressure and surface tension of the capillary liquid, which can tightly adhere the particles together to form a stable ash accumulation structure.

[0038] Based on this, the present application intends to inhibit boiler coking by adding a coking inhibitor. The coking inhibitor of the present application is a highly active powder product, which is sprayed into the coking area by compressed air to produce a series of physical and chemical reactions, and changes the form of coking by increasing the melting point of ash, changing the wettability between solid and liquid, physical expansion, lattice distortion, etc., thereby improving the problem of boiler coking and ash accumulation.

[0039] In one embodiment of the present application, a boiler coking inhibitor is provided, which includes the following components, calculated by mass percentage: 40% to 70% aluminum-containing mineral components, 15% to 30% chlorite, 0% to 30% silicon-containing mineral components, and 0% to 20% iron-containing components; the silicon-containing mineral components and the iron-containing components are not both 0.

[0040] Among them, the aluminum-containing mineral component is selected from at least one of smelted bauxite, raw bauxite, activated bauxite, aluminum hydroxide and rho-type alumina.

[0041] The silicon-containing mineral component includes at least one of silicon dioxide powder, microsilica powder and quartz powder.

[0042] The iron-containing component includes at least one of reduced iron powder and iron oxide.

[0043] The above-mentioned boiler coking inhibitor includes aluminum mineral components, chlorite, silicon-containing mineral components and iron-containing components of specific components and proportions. Among them, chlorite minerals have high surface chemical activity and good dispersibility in the system. They can absorb the molten liquid phase components in the coke and penetrate into the coke body through capillary action to produce swelling. The content of aluminum oxide in slaked alumina, raw alumina, activated alumina, etc. is very high. Aluminum hydroxide can also be converted into aluminum oxide components under high temperature conditions, and cooperate with other components such as silicon dioxide, silicon micropowder with a high silicon dioxide content, microsilica powder and quartz powder components to form high-melting point compounds at high temperatures, thereby effectively increasing the ash melting point and reducing the melting of slag. Furthermore, the reduced iron powder forms iron oxides under high temperature conditions. The iron oxides in the system mainly play a flocculation and dispersion role, weakening the agglomeration between particles that aggregate and settle due to van der Waals forces, forming a loose flocculent structure, and evenly dispersed in the system; it can also adsorb and fix the alkali metals in the coke, reducing its reactivity at high temperatures, which helps to reduce the reaction of alkali metals with other components in the slag, thereby inhibiting the formation of coke; iron oxides also have strong permeability, which can promote other components in the coke inhibitor to penetrate into the slag to participate in the reaction, improve the reaction efficiency, and crystallize to make the slag easy to fall off. In short, this application combines the unique physical and chemical effects of various minerals to formulate a specific ratio, produce a synergistic effect, and have a good coke inhibition effect.

[0044] The coking inhibitor of the present application is a highly active powder product. After being sprayed into the coking area by compressed air or mixed with fuel, a series of physical and chemical reactions occur. The coking inhibitor of the present invention can be operated without stopping the machine, will not affect the load and operation, can avoid the economic losses caused by the load and shutdown, and has obvious economic benefits. The use of the coking inhibitor product of the present invention can also avoid the corrosion of liquid ash particles to the equipment, which can greatly extend the life of the equipment.

[0045] The coking inhibitor of the present application uses cheap minerals as raw materials, has low cost, does not release toxic or harmful gases during use, is green and environmentally friendly, and does not cause excessive emissions.

[0046] In this application, calcined alumina is bauxite obtained by calcining raw alumina at high temperature. Due to sintering and other phenomena during the calcination process, the volume shrinks and the density increases, usually between 3.0g / cm³ and 3.5g / cm³. After high-temperature calcination, the chemical activity decreases. The calcined alumina used in this application is conventional calcined alumina available on the market.

[0047] Raw bauxite: refers to the raw material of bauxite ore after simple beneficiation, crushing, grinding and other preliminary processing. It basically maintains the original physical and chemical properties of the ore, but the particle size becomes smaller. The density is relatively small, generally around 2.3g / cm³~2.7g / cm³. It has high chemical activity and can easily participate in some chemical reactions. The raw bauxite used in this application is conventional raw bauxite available on the market.

[0048] Activated alumina: also known as activated alumina (crystalline phase γ-Al2O3), raw alumina is subjected to acid or alkali precipitation to obtain pseudo-boehmite, and pseudo-boehmite is heat-treated at high temperature (usually at 400~600℃) to cause a phase change and transform into γ-Al2O3. γ-Al2O3 is a porous, highly dispersed solid material with a large specific surface area and a specific microporous surface structure, and has good adsorption performance, surface activity, excellent thermal stability, etc. The activated alumina used in this application is a conventional activated alumina available on the market, for example, China Aluminum Shandong Co., Ltd., activated alumina G1.

[0049] As an example, in the boiler coking inhibitor, the mass fraction of the aluminum-containing mineral component can be 40%, 42%, 45%, 46%, 48%, 50%, 52%, 55%, 56%, 58%, 60%, 62%, 65%, 68% or 70%. Further, the mass fraction of the aluminum-containing mineral component in the boiler coking inhibitor can be a range value consisting of any two of the above point values ​​as end values. Preferably, in the boiler coking inhibitor, the mass fraction of the aluminum-containing mineral component can be 55% to 70%.

[0050] Microsilica powder: The main component is silicon dioxide, and it also contains some amorphous impurities. It is an industrial by-product. It comes from the waste gas generated during the high-temperature smelting of industrial silicon and ferrosilicon in industrial electric furnaces. It is obtained by collecting the condensation products of silicon vapor in the smoke. The particles are extremely fine, belonging to the nanometer level or submicron level. The silicon powder used in this application is the commonly used commercial microsilica powder, for example, Chengdu East Bluestar Technology Development Co., Ltd., light-colored high-density microsilica powder.

[0051] As an example, in the boiler coking inhibitor, the mass fraction of chlorite may be 15%, 16%, 18%, 20%, 22%, 24%, 25%, 26%, 28% or 30%. Further, the mass fraction of chlorite in the boiler coking inhibitor may be a range value consisting of any two of the above point values ​​as end values. Preferably, in the boiler coking inhibitor, the mass fraction of chlorite may be 15% to 25%.

[0052] As an example, in the boiler coking inhibitor, the mass fraction of the silicon-containing mineral component can be 0, 5%, 8%, 10%, 15%, 16%, 18%, 20%, 22%, 24%, 25%, 26%, 28% or 30%. Further, the mass fraction of the silicon-containing mineral component in the boiler coking inhibitor can be a range value consisting of any two of the above point values ​​as end values. Preferably, in the boiler coking inhibitor, the mass fraction of the silicon-containing mineral component can be 15% to 30%.

[0053] As an example, in the boiler coking inhibitor, the mass fraction of the iron-containing component can be 0, 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or 20%. Further, the mass fraction of the silicon-containing mineral component in the boiler coking inhibitor can be a range value consisting of any two of the above point values ​​as end values. Preferably, in the boiler coking inhibitor, the mass fraction of the iron-containing component can be 5% to 20%.

[0054] In some embodiments, the boiler coking inhibitor comprises the following components: 55% to 70% of an aluminum-containing mineral component, 15% to 25% of chlorite, and 15% to 30% of a silicon-containing mineral component.

[0055] Furthermore, the boiler coking inhibitor includes the following components: 55% to 65% of calcine, 20% to 25% of chlorite and 15% to 25% of silicon dioxide.

[0056] In some embodiments, the boiler coking inhibitor includes the following components: 55% to 70% aluminum-containing mineral components, 15% to 25% chlorite, and 5% to 20% by weight of iron-containing components.

[0057] Furthermore, the boiler coking inhibitor includes the following components: 65% to 70% of calcine, 18% to 25% of chlorite and 8% to 12% of iron oxide.

[0058] In some embodiments, the average particle size of the aluminum-containing mineral component is 400 mesh to 600 mesh.

[0059] In some embodiments, the average particle size of chlorite is 500 mesh to 800 mesh. As an example, the average particle size of chlorite can be 500 mesh, 550 mesh, 600 mesh, 650 mesh, 700 mesh, 750 mesh or 800 mesh. Further, the average particle size of chlorite can be a range value consisting of any two of the above point values ​​as end values. Preferably, the average particle size of the chlorite family is 600 mesh.

[0060] In some embodiments, the average particle size of the silicon-containing mineral component is 300 mesh to 8000 mesh. As an example, the average particle size of the silicon-containing mineral component is 300 mesh, 325 mesh, 350 mesh, 400 mesh, 450 mesh, 500 mesh, 550 mesh, 600 mesh, 700 mesh, 1000 mesh, 2000 mesh, 4000 mesh, 5000 mesh, 6000 mesh or 8000 mesh. Further, the average particle size of the silicon-containing mineral component can be a range value consisting of any two of the above point values ​​as end values.

[0061] Furthermore, the average particle size of the silicon dioxide powder in the silicon-containing mineral component is 500 mesh to 700 mesh.

[0062] Furthermore, the average particle size of the microsilica powder in the silicon-containing mineral component is 6000 mesh to 8000 mesh.

[0063] Further, the particle size of the quartz powder in the silicon-containing mineral component is 300 mesh to 600 mesh. As an example, the average particle size of the quartz powder can be 300 mesh, 325 mesh, 400 mesh, 500 mesh or 600 mesh. It can also be other mesh numbers within the above range. It can be understood that the quartz powder with a mesh number of 500 mesh to 600 mesh is also the silicon powder in the art. Preferably, the average particle size of the quartz powder in the silicon-containing mineral component is 300 mesh to 400 mesh. Alternatively, the average particle size of the silicon powder is 500 mesh to 600 mesh.

[0064] In some embodiments, the average particle size of the iron-containing component is 200 mesh to 600 mesh. As an example, the average particle size of the iron-containing component can be 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh, 500 mesh, 550 mesh or 600 mesh. Further, the average particle size of the iron-containing component can be a range value consisting of any two of the above point values ​​as end values.

[0065] Furthermore, the average particle size of the reduced iron powder in the iron-containing component is 200 mesh to 300 mesh.

[0066] Furthermore, the average particle size of iron oxide in the iron-containing component is 500 mesh to 600 mesh.

[0067] The particle size of each component in the boiler coking inhibitor will affect the boiler coking inhibition effect. Within the above range, the smaller the particle size of the component, the better the solubility and dispersibility, which helps the coking inhibitor to be more evenly distributed in the boiler; the coking inhibitor particles with smaller particle size have a larger specific surface area and can react with the ash and flue gas condensate in the boiler more quickly.

[0068] In some embodiments, the boiler coking inhibitor is a powder.

[0069] In some embodiments, the average particle size of the boiler coking inhibitor is 300 mesh to 500 mesh.

[0070] In one embodiment of the present application, a method for preparing a boiler coking inhibitor is also provided, comprising the following steps: configuring raw materials according to the components of the boiler coking inhibitor, and mixing the raw materials uniformly to obtain the boiler coking inhibitor.

[0071] In one embodiment of the present application, a method for inhibiting boiler coking is also provided, comprising the following steps: during the operation of the boiler, spraying the above-mentioned boiler coking inhibitor into the boiler coking area. It can be understood that the boiler coking area refers to the area in the boiler where coking may occur based on conventional experience. It can also be the area where coking has already occurred.

[0072] In some embodiments, the boiler may be a copper smelting boiler, a lead smelting boiler, or a zinc smelting boiler.

[0073] In some embodiments, the mass ratio of the added amount of the boiler coking inhibitor to the ore to be smelted in the boiler is (0.3~1):1000.

[0074] The embodiments of the present invention will be described in detail below in conjunction with examples. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. The experimental methods in the following examples that do not specify specific conditions are preferably referred to the guidance provided in the present invention, and can also be based on the experimental manual or normal conditions in this area, can also be based on the conditions recommended by the manufacturer, or refer to experimental methods known in the art.

[0075] In the following specific embodiments, the measured parameters of raw material components may have slight deviations within the range of weighing accuracy unless otherwise specified. For temperature and time parameters, acceptable deviations caused by instrument test accuracy or operation accuracy are allowed.

[0076] The reagent information used in the examples and comparative examples of the present invention is as follows:

[0077] Chlorite: Haicheng Hetai Powder Technology Co., Ltd., CP-600, average particle size 600 mesh. The composition includes SiO2 content of 45%~50%, Al2O3 content of 10%~15%, MgO content of 20%~25%, and Fe2O3 content of 1%~5%.

[0078] Burnt bauxite: Gongyi Fenghuang Refractory Material Factory, 325 mesh, Al2O3 content greater than 70%;

[0079] Aluminum hydroxide: Xinxiang Jinsheng New Materials Co., Ltd., 800 mesh, Al (OH) 3 content greater than 99.8%.

[0080] Activated bauxite: China Aluminum Shandong Co., Ltd., activated alumina G1, 325 mesh, Al2O3 content greater than 98.6%.

[0081] ρ-type alumina: Chalco Shandong Co., Ltd., activated alumina (ρ-type), 400 mesh, Al2O3 content greater than 98.6%.

[0082] Silica: Yifeng Mining Technology (Dongyuan) Co., Ltd., 600 mesh, SiO2 content 96%~98%, normal white.

[0083] Silica powder: Donghai County Jinghe Silica Powder Co., Ltd., 600 mesh, SiO2 content 99.9%.

[0084] Microsilica fume: Chengdu East Bluestar Technology Development Co., Ltd., light color high density microsilica fume, 8000 mesh.

[0085] Quartz powder: Majiang County Jingfa Mining Co., Ltd., 325 mesh.

[0086] Reduced iron powder: Wuhan Jingang New Materials Co., Ltd., 200 mesh.

[0087] Iron oxide: Fe2O3 Zibo Zichuan Liqiang Pigment Co., Ltd., national standard 180, 500 mesh.

[0088] Bentonite: Gansu Hongquan Bentonite Co., Ltd., sodium bentonite, 200 mesh, montmorillonite content greater than 90%.

[0089] Activated clay: Huangshan Baiyue Activated Clay Co., Ltd., 325 mesh.

[0090] Kaolin: Hengda Kaolin Material Factory, Xiangcheng District, Suzhou City, 200 mesh.

[0091] Example 1

[0092] Step 1: According to the formula in Formula Table 1, weigh the corresponding raw materials and mix them evenly to obtain a coking inhibitor.

[0093] Step 2: During the operation of the No. 1 copper smelting bottom blowing smelting furnace, the coking inhibitor obtained in step 1 is sprayed into the coking area of ​​the boiler by compressed air, wherein the mass ratio of the coking inhibitor to the ore is 0.5:1000, that is, 0.5 kg of coking inhibitor is required for each ton of ore for smelting. After the furnace is shut down, the coking thickness at the furnace mouth is observed, and the time required for the robot arm to clean the coking is recorded.

[0094] Step 3: During the operation of the No. 2 copper smelting bottom blowing furnace, the coking inhibitor obtained in step 1 is sprayed into the coking area of ​​the boiler by compressed air, wherein the mass ratio of the coking inhibitor to the ore is 0.5:1000, that is, 0.5 kg of coking inhibitor is required for each ton of ore for smelting. After the furnace is stopped, the coking thickness at the furnace mouth is observed, and the time required for the robot arm to clean the coking is recorded. Among them, the No. 1 copper smelting bottom blowing smelting furnace and the No. 2 copper smelting bottom blowing smelting furnace smelt different copper ores respectively.

[0095] Embodiment 2~15

[0096] The preparation methods of Examples 2 to 15 are basically the same as those of Example 1, except that the component formulas of the coking inhibitor are different. The formulas of the coking inhibitors prepared in each example are shown in Table 1.

[0097] Blank test:

[0098] In this blank test, no coking inhibitor was added during the sintering process. After the furnace was shut down, the coking thickness at the furnace mouth was observed, and the time required for the robot arm to clean the coking was recorded.

[0099] Comparative Examples 1 to 10

[0100] The preparation methods of Comparative Examples 1 to 10 are basically the same as those of Example 1, except that the component formulas of the prepared coking inhibitors are different, and the specific formulas are shown in Table 1. The other preparation steps are the same as those of Example 1.

[0101] The formulas of the coking inhibitors prepared in the examples and comparative examples are shown in Table 1.

[0102] Table 1

[0103]

[0104] The coking conditions and coking cleaning time after sintering in the furnace of each embodiment and comparative example are shown in Table 2.

[0105] Table 2

[0106]

[0107] Note: "No. 1 Copper Smelting Bottom Blowing Furnace Boiler Mouth (Iron Content>20%)" in the table means that the content of iron oxide in the coke composition is greater than 20%. "No. 2 Copper Smelting Bottom Blowing Furnace Boiler Mouth (Iron Content<20%)" in the table means that the content of iron oxide in the coke composition is less than 20%. The copper ore materials smelted in the No. 1 Copper Smelting Bottom Blowing Furnace and the No. 2 Copper Smelting Bottom Blowing Furnace are different, and the smelting processes are different, so the iron oxide content in the coke is different.

[0108] From the data in Table 2, we can see that no coking inhibitors were added during the combustion process of the No. 1 copper smelting bottom-blown smelting furnace; after the furnace was shut down, the coking thickness on the east side of the furnace mouth was 25cm, the coking thickness on the southeast corner was 40cm, the coking thickness on the south was 18cm, and the coking thickness on the west was 13cm; the time to clean the coking with a robotic arm was 180min. No coking inhibitors were added during the combustion process of the No. 2 copper smelting bottom-blown smelting furnace; after the furnace was shut down, the coking thickness on the east side of the furnace mouth was 45cm, the coking thickness on the south was 20cm, the coking thickness on the west was 50cm, and the coking thickness on the north was 40cm; the time to clean the coking with a robotic arm was 120min.

[0109] In Examples 1 to 15, coking inhibitors were added during the combustion process of the No. 1 copper smelting bottom blowing furnace; after the furnace was shut down, the coking thickness on the east side of the furnace mouth was 5 to 22 cm, the coking thickness on the southeast corner was 15 to 34 cm, the coking thickness on the south was 3 cm to 16 cm, and the coking thickness on the west was 0 to 15 cm; the time for cleaning the coking by a mechanical arm was 25 cm to 85 min. No coking inhibitor was added during the combustion process of the No. 2 copper smelting bottom blowing furnace; after the furnace was shut down, the coking thickness on the east side of the furnace mouth was 5 cm to 36 cm, the coking thickness on the south was 0 to 15 cm, the coking thickness on the west was 17 cm to 34 cm, and the coking thickness on the north was 10 cm to 35 cm; the time for cleaning the coking by a mechanical arm was 15 min to 70 min. It can be seen that the coking inhibitor prepared by the technical method of the present application has a good coking inhibitory effect on different types of combustion boilers; and the coking inhibitor of the present application is effective, effectively alleviating the coking situation at the furnace mouth, and improving economic benefits and safety assurance.

[0110] Comparative Examples 1 to 10 use a different ratio from that of the present application to prepare a coking inhibitor. However, the results show that after using the coking inhibitors of Comparative Examples 1 to 10, the coking thickness at the furnace mouth is higher than that of Examples 1 to 15, and the time required for cleaning by a robotic arm is also higher than that of Examples 1 to 15; even, the coking thickness at the furnace mouth in some comparative examples is higher than the coking thickness at the furnace mouth when no coking inhibitor is added in the blank test; indicating that the coking inhibitors prepared in some comparative examples not only fail to achieve the effect of inhibiting coking, but aggravate the coking problem.

[0111] 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.

[0112] The above-described embodiments only express several implementation methods of the present invention, which are convenient for understanding the technical solutions of the present invention in detail, but they 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, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. 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 by the present invention are all within the protection scope of the claims attached to the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the contents of the attached claims, and the description can be used to interpret the contents of the claims.

Claims

1. A boiler coking inhibitor, characterized in that: The composition includes the following components by mass percentage: 40% to 70% aluminum-containing mineral component, 15% to 30% chlorite, 0% to 30% silicon-containing mineral component and 0% to 20% iron-containing component; the silicon-containing mineral component and the iron-containing component are not both 0; The aluminum-containing mineral component is selected from at least one of smelted alumina, raw alumina, activated alumina, aluminum hydroxide and p-type alumina; The silicon-containing mineral component includes at least one of silicon dioxide powder, microsilica powder and quartz powder; The iron-containing component includes at least one of reduced iron powder and iron oxide.

2. The boiler coking inhibitor according to claim 1, characterized in that: The boiler coking inhibitor meets at least one of the following conditions: (1) The average particle size of the aluminum-containing mineral component is 400 mesh to 600 mesh; (2) The average particle size of the chlorite is 500-800 mesh; (3) The average particle size of the silicon-containing mineral component is 300 mesh to 8000 mesh; (4) The average particle size of the iron-containing component is 200 mesh to 600 mesh.

3. The boiler coking inhibitor according to claim 1, characterized in that: Calculated by mass percentage, it includes the following components: 55% to 70% of the aluminum-containing mineral component, 15% to 25% of chlorite and 15% to 30% of the silicon-containing mineral component.

4. The boiler coking inhibitor according to claim 1, characterized in that: Calculated by mass percentage, it includes the following components: 55% to 70% of the aluminum-containing mineral component, 15% to 25% of chlorite and 5% to 20% of the iron-containing component.

5. The boiler coking inhibitor according to claim 1, characterized in that: Calculated by mass percentage, it includes the following components: 55% to 65% calcine, 20% to 25% chlorite and 15% to 25% silicon dioxide; or, Calculated by mass percentage, it includes the following components: 65%~70% slaked alumina, 18%~25% chlorite and 8%~12% iron oxide.

6. The boiler coking inhibitor according to any one of claims 1 to 5, characterized in that: The iron oxide is ferric oxide.

7. The boiler coking inhibitor according to any one of claims 1 to 5, characterized in that: The boiler coking inhibitor is a powder; the average particle size of the boiler coking inhibitor is 300 mesh to 500 mesh.

8. A method for preparing a boiler coking inhibitor, characterized in that: The method comprises the following steps: configuring raw materials according to the boiler coking inhibitor component according to any one of claims 1 to 7, and uniformly mixing the raw materials to obtain the boiler coking inhibitor.

9. A method for inhibiting boiler coking, characterized in that: The steps include: During the operation of the boiler, the boiler coking inhibitor according to any one of claims 1 to 7 is sprayed into the coking area of ​​the boiler.

10. The method for inhibiting boiler coking according to claim 9, characterized in that: The mass ratio of the added amount of the boiler coking inhibitor to the ore to be smelted in the boiler is (0.3~1):1000.

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