Boiler coking inhibitor and preparation method and application thereof
By using boiler coking inhibitors composed of chlorite, talc and other minerals, the problems of poor effect and narrow application of traditional inhibitors are solved, and effective inhibition and wide application of boiler coking is achieved.
Patent Information
- Application Number
- CN202510017868.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2025-03-25
AI Technical Summary
Traditional boiler coking inhibitors have poor inhibitory effects on boiler coking and have a narrow range of applications.
A boiler coking inhibitor is provided, including chlorite, talc and other minerals, such as vermiculite, magnesium oxide, bentonite, etc. The inhibitor made of mixing these components is incorporated into the fuel or injected into the coking area to achieve inhibition of boiler coking.
The boiler coking inhibitor has a good inhibitory effect and a wide range of application. It can effectively reduce the problems of coking ash accumulated by the air pre-drug boiler inlet boiler and the desulfurization tower of the waste incineration boiler.
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of coking inhibitors, and in particular to a boiler coking inhibitor and a preparation method and application thereof. Background Art
[0002] Boiler coking refers to the process in which the ash in the fuel melts at high temperatures and adheres to the heating surface to form hard coke during boiler operation. 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. Therefore, it is necessary to reduce the coking of the boiler as much as possible to improve the stability and safety of boiler operation. Traditional methods to reduce boiler coking include improving boiler design, optimizing combustion methods, improving fuel quality, etc., but these methods are often costly and overly complicated. Therefore, the coking problem of the boiler can be improved at a low cost through boiler coking inhibitors. Boiler coking inhibitors are a chemical agent used to reduce coking in boilers.
[0003] However, traditional boiler coking inhibitors have poor inhibitory effects on boiler coking and have a narrow scope of application. Summary of the invention
[0004] Based on this, it is necessary to provide a boiler coking inhibitor and its preparation method and application. The boiler coking inhibitor of the present application has a good inhibitory effect on boiler coking and has a wide range of applications.
[0005] In a first aspect, the present application provides a boiler coking inhibitor, comprising the following components in parts by weight:
[0006] 20 to 40 parts of chlorite, 20 to 40 parts of talc, and 20 to 60 parts of other raw materials; the other raw materials include at least one of vermiculite, magnesium oxide, bentonite, montmorillonite, activated clay, industrial salt, trisodium phosphate and sodium sulfate.
[0007] In some embodiments, the boiler coking inhibitor includes the following components in parts by weight: 33.3 to 40 parts of the chlorite, 33.3 to 40 parts of the talc, and 20 to 33.3 parts of the first raw material, wherein the first raw material includes at least one of industrial salt, trisodium phosphate and sodium sulfate.
[0008] In some embodiments, the boiler coking inhibitor includes the following components in parts by weight: 20 to 33.33 parts of chlorite, 20 to 33.33 parts of talc, and 33.33 to 60 parts of a second raw material; the second raw material includes at least one of vermiculite, magnesium oxide, bentonite, montmorillonite and activated clay.
[0009] In some embodiments, the magnesium oxide comprises activated magnesium oxide.
[0010] In some embodiments, the boiler coking inhibitor comprises the following components in percentage by weight: 20% to 40% of the chlorite, 20% to 40% of the talc, and 20% to 60% of the other raw materials.
[0011] In some embodiments, the boiler coking inhibitor comprises the following components in mass percentage: 20% chlorite, 20% talc and 60% vermiculite.
[0012] In some embodiments, the boiler coking inhibitor comprises chlorite, talc and industrial salt in equal amounts.
[0013] In a second aspect, the present application provides a method for preparing a boiler coking inhibitor, comprising the following steps:
[0014] The following components are mixed in parts by mass: 20 to 40 parts of chlorite, 20 to 40 parts of talc, and 20 to 60 parts of other raw materials; the other raw materials include at least one of vermiculite, magnesium oxide, bentonite, montmorillonite, activated clay, industrial salt, trisodium phosphate and sodium sulfate.
[0015] In a third aspect, the present application provides a method for inhibiting boiler coking, comprising the following steps:
[0016] The boiler coking inhibitor described in any one of the above items is mixed into the fuel of the boiler, or the boiler coking inhibitor described in any one of the above items is sprayed into the coking area of the boiler.
[0017] In a fourth aspect, the present application provides a method for inhibiting coking and ash deposition in an air preheater of a pulverized coal boiler, by adding any of the boiler coking inhibitors described above into the fuel of the pulverized coal boiler, or by spraying any of the boiler coking inhibitors described above into the coking and ash deposition area of the air preheater.
[0018] In a fifth aspect, the present application provides a method for inhibiting coking in a desulfurization tower of a waste incineration boiler, by adding any of the above-mentioned boiler coking inhibitors into the fuel of the waste incineration boiler, or by spraying any of the above-mentioned boiler coking inhibitors into the coking area of the desulfurization tower.
[0019] The boiler coking inhibitor of the present application has a good inhibitory effect on boiler coking and a wide range of applications. In particular, the boiler coking inhibitor of the present application can be used to reduce the coking and ash accumulation problem of the air preheater of a pulverized coal boiler, and can also be used to reduce the coking problem of the desulfurization tower of a waste incineration boiler, and both can have a good inhibitory effect on boiler coking. DETAILED DESCRIPTION
[0020] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.
[0021] 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. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.
[0022] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0023] In addition, 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 the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0024] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0025] In a first aspect, the present application provides a boiler coking inhibitor, comprising the following components in parts by weight:
[0026] 20 to 40 parts of chlorite, 20 to 40 parts of talc, and 20 to 60 parts of other raw materials; the other raw materials include at least one of vermiculite, magnesium oxide, bentonite, montmorillonite, activated clay, industrial salt, trisodium phosphate and sodium sulfate.
[0027] The boiler coking inhibitor of the present application has a good inhibitory effect on boiler coking and a wide range of applications. In particular, the boiler coking inhibitor of the present application can be used to reduce the coking and ash accumulation problem of the air preheater of a pulverized coal boiler, and can also be used to reduce the coking problem of the desulfurization tower of a waste incineration boiler, and both can have a good inhibitory effect on boiler coking.
[0028] During the research process, the present application found that the process of boiler coking and ash accumulation includes three stages: initial deposition, deposition growth, and deposition solidification. The degree of coking mainly depends on the adhesion tendency of the impacting particles and the capture ability of the deposition surface. Boiler coking and ash accumulation is essentially the result of the interaction between the adhesive (melt) and the particles. The boiler coking inhibitor of the present application can be directly added to the boiler fuel, or the boiler coking inhibitor can be sprayed into the coking area of the boiler to react physically and chemically with the coking and other ash particles on the heating surface, thereby increasing the ash melting point as a whole and reducing the surface viscosity of the ash particles. Finally, the ash accumulation is removed by expansion dispersion and other methods.
[0029] Furthermore, the raw materials of the boiler coking inhibitor of the present application are all low-priced minerals, and the use cost is low. At the same time, the risk of toxic and harmful gas release during use is low, and it is green and environmentally friendly. In addition, the boiler coking inhibitor is easy to use and can be added without stopping the machine, without affecting the load and operation, and can avoid economic losses caused by downtime.
[0030] Chlorite is a special 2:1 type hydrous layered aluminum silicate mineral and one of the main clay minerals. Its chemical composition can be expressed as Y3[Z4O 10 ](OH)2·Y3(OH)6, where Y mainly represents Mg 2+ , Fe 2+ 、Al 3+ and Fe 3+ , Z is mainly Si and Al, and the crystal belongs to a family of layered silicate minerals of monoclinic, triclinic or orthorhombic (orthorhombic) system. Chlorite crystals are pseudo-hexagonal flakes or plates, the flakes are flexible, and the aggregates are scaly and earthy. The specific gravity is 2.6~3.3, and the Mohs hardness is 2~3.
[0031] Talc is a silicate mineral with the chemical formula Mg3Si4O 10(OH)2, expressed as 3MgO·4SiO2·H2O in oxide form, is mainly composed of hydrous magnesium silicate, and also contains a small amount of impurities such as aluminum oxide. Talc belongs to the monoclinic system, with a layered lattice structure, often in the form of flakes, scales, dense blocks, and also in the form of leaf-like, phosphorus-like, granular, fibrous aggregates, etc. The Mohs hardness is 1 and the specific gravity is 2.75.
[0032] The main components of vermiculite are hydrous silicate minerals of magnesium, aluminum and iron. These elements are arranged in a complex crystal structure, which changes significantly when heated. The most prominent physical property of vermiculite is its thermal expansion. At high temperatures of 800℃~1000℃, vermiculite will expand rapidly and its volume can increase by 8~20 times. The density of vermiculite is relatively low, especially after expansion, the density is generally between 0.06g / cm³~0.2g / cm³. Its hardness is relatively low, with a Mohs hardness of about 1~1.5.
[0033] Bentonite is a non-metallic mineral with montmorillonite as its main mineral component, and the montmorillonite content is 85%~90%.
[0034] Montmorillonite is a layered silicate mineral whose crystal structure is a 2:1 type crystal structure consisting of two layers of silicon-oxygen tetrahedrons sandwiched between a layer of aluminum-oxygen octahedrons.
[0035] Activated clay, also known as bleaching earth, is a fine-grained, naturally produced, high-adsorption soil-like material, mainly composed of silicon dioxide (SiO2), aluminum oxide (Al2O3), and iron oxide (Fe2O3).
[0036] The main component of industrial salt is sodium chloride.
[0037] Optionally, the mass fraction of chlorite in the boiler coking inhibitor is 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts or 40 parts, or, the mass fraction of chlorite in the boiler coking inhibitor may also be within the range between any two of the above mass fractions.
[0038] Optionally, the mass fraction of talc in the boiler coking inhibitor is 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 32 parts, 34 parts, 36 parts, 38 parts or 40 parts, or, the mass fraction of talc in the boiler coking inhibitor may also be within the range between any two of the above mass fractions.
[0039] Optionally, the mass fraction of other raw materials in the boiler coking inhibitor is 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts, or, the mass fraction of other raw materials in the boiler coking inhibitor can also be within the range between any two of the above mass fractions.
[0040] In some embodiments, the boiler coking inhibitor includes the following components in parts by weight: 33.3 to 40 parts of chlorite, 33.3 to 40 parts of talc, and 20 to 33.3 parts of a first raw material, wherein the first raw material includes at least one of industrial salt, trisodium phosphate and sodium sulfate.
[0041] The above-mentioned boiler coking inhibitor is effective in reducing the coking problem of the desulfurization tower of the waste incineration boiler.
[0042] In some embodiments, the boiler coking inhibitor includes the following components in parts by weight: 20 to 33.33 parts of chlorite, 20 to 33.33 parts of talc, and 33.33 to 60 parts of a second raw material; the second raw material includes at least one of vermiculite, magnesium oxide, bentonite, montmorillonite and activated clay.
[0043] The above-mentioned boiler coking inhibitor is effective in reducing the coking and ash accumulation problem in the air preheater of a pulverized coal boiler.
[0044] In some embodiments, the magnesium oxide comprises activated magnesium oxide.
[0045] The magnesium oxide in this application may be active magnesium oxide. Active magnesium oxide is a special type of magnesium oxide. It refers to magnesium oxide with high chemical activity, and its activity is mainly reflected in its ability to react with water or other chemicals. Special processes are usually used to produce active magnesium oxide. A common method is to calcine magnesium carbonate or magnesium hydroxide at a relatively low temperature. For example, magnesium hydroxide is used as a raw material and calcined at a relatively low temperature (such as 400°C to 600°C). The magnesium oxide obtained in this way has a higher specific surface area and activity. Because the lower calcination temperature makes the crystal structure of magnesium oxide incomplete, it has more defects and active sites, thereby enhancing its chemical activity. The specific surface area of ordinary magnesium oxide is relatively small, generally around 10m 2 / g~30m 2 / g, usually the particles are relatively dense. Activated magnesium oxide has a large specific surface area, which can reach 50m 2 / g~200m 2 / g or even higher. The larger specific surface area allows active magnesium oxide to have more surface atoms and active centers, which is also an important reason for its high chemical activity. Its particles are often loose.
[0046] In some embodiments, the boiler coking inhibitor includes the following components in the following mass percentages: 20% to 40% of chlorite, 20% to 40% of talc, and 20% to 60% of other raw materials.
[0047] Optionally, the mass percentage of chlorite in the boiler coking inhibitor is 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38% or 40%, or, the mass percentage of chlorite in the boiler coking inhibitor may also be within the range between any two of the above mass percentages.
[0048] Optionally, the mass percentage of talc in the boiler coking inhibitor is 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38% or 40%, or, the mass percentage of talc in the boiler coking inhibitor may also be within the range between any two of the above mass percentages.
[0049] Optionally, the mass percentage of other raw materials in the boiler coking inhibitor is 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55% or 60%, or, the mass percentage of other raw materials in the boiler coking inhibitor may also be within the range between any two of the above mass percentages.
[0050] In some embodiments, the boiler coking inhibitor comprises the following components in the following mass percentages: 20% to 40% of chlorite, 20% to 40% of talc, and 20% to 60% of other raw materials.
[0051] It can be understood that the components of the boiler coking inhibitor are the following components in the following mass percentages: 20% to 40% of chlorite, 20% to 40% of talc, and 20% to 60% of other raw materials, which means that the boiler coking inhibitor contains only the above three types of raw materials.
[0052] In some embodiments, the boiler coking inhibitor comprises the following components in mass percentage: 20% chlorite, 20% talc and 60% vermiculite.
[0053] The boiler coking inhibitor having the above components can achieve a better effect of reducing the coking and ash accumulation problem in the air preheater of a pulverized coal boiler.
[0054] In some embodiments, the components of the boiler coking inhibitor are chlorite, talc and industrial salt in equal amounts.
[0055] The boiler coking inhibitor having the above components can achieve a better effect of reducing the coking problem of the desulfurization tower of the waste incineration boiler.
[0056] In some embodiments, the boiler coking inhibitor is a powder.
[0057] It can be understood that the boiler coking inhibitor is a powder, which means that all raw materials in the boiler coking inhibitor are in powder form. The powdered boiler coking inhibitor is convenient to be mixed with the boiler dye or directly sprayed into the coking area of the boiler through compressed air.
[0058] In some embodiments, the particle size of the chlorite is 600 mesh to 800 mesh.
[0059] Optionally, the particle size of the chlorite is 600 mesh, 620 mesh, 640 mesh, 660 mesh, 680 mesh, 700 mesh, 720 mesh, 740 mesh, 760 mesh, 780 mesh or 800 mesh, or the particle size of the chlorite may be within the range between any two of the above particle sizes.
[0060] In some embodiments, the particle size of talc is 600 mesh to 800 mesh.
[0061] Optionally, the particle size of the talc is 600 mesh, 620 mesh, 640 mesh, 660 mesh, 680 mesh, 700 mesh, 720 mesh, 740 mesh, 760 mesh, 780 mesh or 800 mesh, or the particle size of the talc may also be within the range between any two of the above particle sizes.
[0062] In some embodiments, the particle size of the first raw material is 100 mesh to 200 mesh.
[0063] Optionally, the particle size of the first raw material is 100 mesh, 110 mesh, 120 mesh, 130 mesh, 140 mesh, 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh or 200 mesh, or, the particle size of the first raw material may also be within the range between any two of the above particle sizes.
[0064] In some embodiments, the particle size of the second raw material is 200 mesh to 500 mesh.
[0065] Optionally, the particle size of the second raw material is 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh or 500 mesh, or the particle size of the second raw material may also be within the range between any two of the above particle sizes.
[0066] It is understood that the mesh number of the particle size refers to: Mesh refers to the number of holes on the screen per inch. For example, 100 mesh means there are 100 holes on the screen per inch. The larger the mesh number, the smaller the hole size. It is a common unit for measuring particle size, mainly used in screening methods to determine the particle size range of particles. Within the particle size range of the above components, the boiler coking inhibitor has a better inhibitory effect on boiler coking.
[0067] Another embodiment of the present application provides a method for preparing a boiler coking inhibitor, comprising the following steps:
[0068] The following components are mixed in parts by weight: 20 to 40 parts of chlorite, 20 to 40 parts of talc, and 20 to 60 parts of other raw materials; the other raw materials include at least one of vermiculite, magnesium oxide, bentonite, montmorillonite, activated clay, industrial salt, trisodium phosphate and sodium sulfate.
[0069] Another embodiment of the present application provides a method for inhibiting boiler coking, comprising the following steps:
[0070] Any of the above boiler coking inhibitors is mixed into the fuel of the boiler, or any of the above boiler coking inhibitors is sprayed into the coking area of the boiler.
[0071] It is understood that the coking area of the boiler refers to the area in the boiler that has already coked. The boiler coking inhibitor of the present application can be added to the boiler fuel to inhibit the coking of the boiler, and the boiler coking inhibitor can be sprayed into the coking area of the boiler to improve the coking of the area that has already coked.
[0072] Another embodiment of the present application provides a method for inhibiting coking and ash deposition in an air preheater of a pulverized coal boiler, by adding any of the above-mentioned boiler coking inhibitors into the fuel of the pulverized coal boiler, or by spraying any of the above-mentioned boiler coking inhibitors into the coking and ash deposition area of the air preheater.
[0073] Another embodiment of the present application provides a method for inhibiting coking in a desulfurization tower of a waste incineration boiler, wherein any of the above-mentioned boiler coking inhibitors is added to the fuel of the waste incineration boiler, or any of the above-mentioned boiler coking inhibitors is sprayed into the coking area of the desulfurization tower.
[0074] The following are specific embodiments
[0075] Example 1
[0076] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 1 is 20% chlorite, 20% talc, and 60% vermiculite.
[0077] Example 2
[0078] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 2 is 20% chlorite, 20% talc, and 60% magnesium oxide.
[0079] Example 3
[0080] Calculated by mass percentage, the composition of the boiler coking inhibitor in Example 3 is 20% chlorite, 20% talc, and 60% active magnesium oxide.
[0081] Example 4
[0082] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 4 is 20% chlorite, 20% talc, and 60% bentonite.
[0083] Example 5
[0084] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 5 is 20% chlorite, 20% talc, and 60% montmorillonite.
[0085] Example 6
[0086] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 6 is 20% chlorite, 20% talc, and 60% activated clay.
[0087] Example 7
[0088] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 7 is 33.33% chlorite, 33.33% talc, and 33.33% industrial salt.
[0089] Example 8
[0090] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 8 is 40% chlorite, 40% talc, and 20% industrial salt.
[0091] Example 9
[0092] Calculated by mass percentage, the composition of the boiler coking inhibitor in Example 9 is 40% chlorite, 40% talc, and 20% trisodium phosphate.
[0093] Example 10
[0094] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 10 is 40% chlorite, 40% talc, and 20% sodium sulfate.
[0095] Embodiment 11
[0096] Calculated by mass percentage, the composition of the boiler coking inhibitor in Example 11 is 30% chlorite, 30% talc, and 40% vermiculite.
[0097] Example 12
[0098] Calculated by mass percentage, the composition of the boiler coking inhibitor in Example 12 is 30% chlorite, 30% talc, and 40% industrial salt.
[0099] Comparative Example 1
[0100] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 1 is 45% chlorite, 45% talc, and 10% industrial salt.
[0101] Comparative Example 2
[0102] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 2 is 45% chlorite, 45% talc, and 10% trisodium phosphate.
[0103] Comparative Example 3
[0104] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 3 is 45% chlorite, 45% talc, and 10% sodium sulfate.
[0105] Comparative Example 4
[0106] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 4 is 15% chlorite, 15% talc, and 70% industrial salt.
[0107] Comparative Example 5
[0108] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 5 is 10% chlorite, 10% talc, and 80% vermiculite.
[0109] Comparative Example 6
[0110] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 6 is 10% chlorite, 10% talc, and 80% magnesium oxide.
[0111] Comparative Example 7
[0112] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 7 is 10% chlorite, 10% talc, and 80% bentonite.
[0113] Comparative Example 8
[0114] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 8 is 45% chlorite, 45% talc, and 10% vermiculite.
[0115] Comparative Example 9
[0116] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 9 is 20% pyrophyllite, 20% talc, and 60% vermiculite.
[0117] Comparative Example 10
[0118] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 10 is 20% chlorite, 20% black talc, and 60% vermiculite.
[0119] Comparative Example 11
[0120] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 11 is 20% chlorite, 20% talc, and 60% mica.
[0121] Comparative Example 12
[0122] Chlorite 33.33%, talc 33.33%, calcium chloride 33.33%.
[0123] Comparative Example 13
[0124] No boiler coking inhibitors added.
[0125] The raw materials used in the above embodiments are all commercially available powders, and the specific manufacturers and product models are as follows: Chlorite: Haicheng Hetai Powder Technology Co., Ltd., CP-600, 600 mesh. Talc: Haicheng Chengxin Micro-fine Mesh Stone Powder Factory, 800 mesh. Vermiculite: Shijiazhuang Chenxing Industrial Co., Ltd., fine vermiculite, 325 mesh. Magnesium oxide: Haicheng Lisheng Mining Co., Ltd., 90 powder, 325 mesh. Activated magnesium oxide: Hebei Meishen Technology Co., Ltd., activity 40, content 92, 500 mesh. Bentonite: Gansu Hongquan Bentonite Co., Ltd., sodium bentonite, 90%, 200 mesh. Montmorillonite: Inner Mongolia Ningcheng Tianyu Bentonite Technology Co., Ltd., sodium montmorillonite, 95%, 325 mesh. Activated white clay: Huangshan Baiyue Activated White Clay Co., Ltd., 325 mesh. Industrial salt: Huangshi Jiangnan Chemical Raw Materials Co., Ltd., industrial fine salt, 100 mesh. Trisodium phosphate: Wuhan Xinyongqing Chemical Co., Ltd., industrial grade, 200 mesh. Sodium sulfate: Wuhan Tianhui Chemical Co., Ltd., 100 mesh. Pyrophyllite: Jiangsu Ceramics Research Institute Co., Ltd., 200 mesh. Black talc: Shangrao Guangfeng District Yatai Mining Co., Ltd., 400 mesh. Mica: Hebei Huayuan Mining Co., Ltd., phlogopite, 400 mesh. Calcium chloride: Wuhan Tianhui Chemical Co., Ltd., calcium chloride dihydrate.
[0126] The components of the above embodiments and comparative examples are shown in the following table:
[0127]
[0128] It is understood that the pyrophyllite in the above table refers to the comparative example in which chlorite is replaced by pyrophyllite. The black talc in the above table refers to the comparative example in which talc is replaced by black talc. Mica and calcium chloride refer to the comparative example in which other raw materials are replaced by mica and calcium chloride.
[0129] The boiler coking inhibitors of the above embodiments and comparative examples are used to treat the coking ash accumulation in the air preheater of a pulverized coal boiler and the coking ash accumulation in the desulfurization tower of a waste incineration boiler, respectively. The effect of treating the coking ash accumulation in the air preheater of a pulverized coal boiler is characterized by the differential pressure of the air preheater at different positions. The lower the differential pressure, the better the effect of inhibiting coking. The effect of treating the coking ash accumulation in the desulfurization tower of a waste incineration boiler is characterized by observing the number of times the coke body falls off. The higher the number of times the coke body falls off per day, the better the effect of treating the coking ash accumulation in the desulfurization tower of a waste incineration boiler. The test results are shown in the following table:
[0130]
[0131] By comparing the test results of each embodiment and comparative example 13, it can be seen that the differential pressure of the air preheater at different positions of the pulverized coal boiler in each embodiment is significantly lower, and the number of coke shedding times per day in the desulfurization tower of the incineration boiler is significantly higher, that is, the boiler coking inhibitor of the present application can be used to reduce the coking and ash accumulation problem of the air preheater of the pulverized coal boiler, and can also be used to reduce the coking problem of the desulfurization tower of the waste incineration boiler, and both can have a good inhibitory effect on boiler coking.
[0132] By comparing the test results of the embodiments and comparative examples 1 to 8, it can be seen that when the mass percentage of each component in the boiler coking inhibitor is too high or too low, the inhibitory effect on boiler coking is poor.
[0133] By comparing the test results of the embodiments and comparative examples 9 to 12, it can be seen that when the chlorite, talc or other raw materials in the boiler coking inhibitor are replaced with other components, the boiler coking inhibitor has a poor inhibitory effect on boiler coking.
[0134] At the same time, by comparing the test results of each embodiment, it can be seen that the boiler coking inhibitor composed of 20% chlorite, 20% talc and 60% vermiculite has a significantly better effect on treating the coking and dust accumulation problem of the air preheater of a pulverized coal boiler. The boiler coking inhibitor composed of 33.33% chlorite, 33.33% talc and 33.33% industrial salt has a significantly better effect on treating the coking problem of the desulfurization tower of a waste incineration boiler.
[0135] 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.
[0136] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims, and the description may be used to interpret the content of the claims.
Claims
1. A boiler coking inhibitor, characterized in that: The composition comprises the following components in parts by weight: 20 to 40 parts of chlorite, 20 to 40 parts of talc, and 20 to 60 parts of other raw materials; the other raw materials include at least one of vermiculite, magnesium oxide, bentonite, montmorillonite, activated clay, industrial salt, trisodium phosphate and sodium sulfate.
2. The boiler coking inhibitor according to claim 1, characterized in that: The boiler coking inhibitor comprises the following components in parts by mass: 33.3 to 40 parts of the chlorite, 33.3 to 40 parts of the talc, and 20 to 33.3 parts of the first raw material, wherein the first raw material comprises at least one of industrial salt, trisodium phosphate and sodium sulfate.
3. The boiler coking inhibitor according to claim 1, characterized in that: The boiler coking inhibitor comprises the following components in parts by weight: 20 to 33.33 parts of chlorite, 20 to 33.33 parts of talc, and 33.33 to 60 parts of a second raw material; the second raw material comprises at least one of vermiculite, magnesium oxide, bentonite, montmorillonite and activated clay.
4. The boiler coking inhibitor according to claim 1, characterized in that: The magnesium oxide includes active magnesium oxide.
5. The boiler coking inhibitor according to claim 1, characterized in that: The boiler coking inhibitor comprises the following components in percentage by mass: 20% to 40% of the chlorite, 20% to 40% of the talc, and 20% to 60% of the other raw materials.
6. The boiler coking inhibitor according to claim 1, characterized in that: The components of the boiler coking inhibitor are the following components in mass percentage: 20% of chlorite, 20% of talc and 60% of vermiculite; or, the components of the boiler coking inhibitor are chlorite, talc and industrial salt in equal mass.
7. A method for preparing a boiler coking inhibitor, characterized in that: The steps include: The following components are mixed in parts by mass: 20 to 40 parts of chlorite, 20 to 40 parts of talc, and 20 to 60 parts of other raw materials; the other raw materials include at least one of vermiculite, magnesium oxide, bentonite, montmorillonite, activated clay, industrial salt, trisodium phosphate and sodium sulfate.
8. A method for inhibiting boiler coking, characterized in that: The steps include: The boiler coking inhibitor according to any one of claims 1 to 6 is mixed into the fuel of the boiler, or the boiler coking inhibitor according to any one of claims 1 to 6 is sprayed into the coking area of the boiler.
9. A method for inhibiting coking and ash deposition in an air preheater of a pulverized coal boiler, characterized in that: The boiler coking inhibitor according to any one of claims 1 to 6 is added to the fuel of the pulverized coal boiler, or the boiler coking inhibitor according to any one of claims 1 to 6 is sprayed into the coking and ash accumulation area of the air preheater.
10. A method for inhibiting coking of a desulfurization tower of a waste incineration boiler, characterized in that: The boiler coking inhibitor according to any one of claims 1 to 6 is mixed into the fuel of the waste incineration boiler, or the boiler coking inhibitor according to any one of claims 1 to 6 is sprayed into the coking area of the desulfurization tower.