Boiler coking inhibitor and application thereof
By using boiler coking inhibitors with components such as forsterite, chlorite and silica, the melting point of the ash slag and changes the wettability between solid and liquid, the problem of poor effect of traditional inhibitors is solved, and effective inhibition and wide application of boiler coking is achieved.
Patent Information
- Application Number
- CN202510017867.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2025-03-28
AI Technical Summary
Traditional boiler coking inhibitors have poor inhibitory effects on boiler coking and have a narrow range of application, which cannot effectively solve the various harms caused by boiler coking.
A boiler coking inhibitor is provided, including components such as forsterite, chlorite and silica, which inhibit boiler coking by increasing the melting point of the ash slag, changing the wettability between solid and liquid, physical expansion, and lattice distortion.
This boiler coking inhibitor has a good effect on boiler coking and has a wide range of application. It can effectively reduce the coking problems in the position of the screen superheater in waste heat boilers in environmentally friendly boilers and the position of the screen superheater in the coal powder boilers.
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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 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 troubled the industry. Boiler coking will reduce heat transfer efficiency, cause over-temperature damage to the heating surface, change the thermal stress distribution of the heating surface, affect combustion stability, increase incomplete combustion losses, affect the normal ventilation of the boiler, and increase the risk of boiler accidents. Therefore, it is necessary to reduce boiler coking as much as possible to improve the stability and safety of boiler operation.
[0003] Boiler coking inhibitor is a chemical agent used to reduce coking in boilers and is often used to inhibit boiler coking. 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 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] 30 to 60 parts of a first material, 20 to 35 parts of a second material, and 20 to 35 parts of a silicon-containing material; the first material comprises forsterite; the second material comprises at least one of chlorite and serpentine; the silicon-containing material comprises at least one of a silica material, mica and vermiculite.
[0007] In some embodiments, the silicon dioxide material includes at least one of silicon dioxide, microsilica powder, powdered quartz and fused quartz.
[0008] In some embodiments, the first material, the second material, and the silicon-containing material in the boiler coking inhibitor are equal in mass.
[0009] In some embodiments, the components are included in the following mass percentages: 30% to 60% of the first material, 20% to 35% of the second material, and 20% to 35% of the silicon-containing material.
[0010] In some embodiments, the particle size of the first material is 400 mesh to 600 mesh.
[0011] In some embodiments, the particle size of the second material is 200 mesh to 600 mesh.
[0012] In some embodiments, the particle size of the silicon-containing material is 325 mesh to 8000 mesh.
[0013] In some embodiments, the boiler coking inhibitor comprises forsterite, chlorite and silicon dioxide in equal amounts.
[0014] In some embodiments, the boiler coking inhibitor comprises forsterite, chlorite and vermiculite of equal mass.
[0015] In some embodiments, the boiler coking inhibitor is a powder.
[0016] In a second aspect, the present application provides a method for inhibiting boiler coking, comprising the following steps:
[0017] 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.
[0018] In a third aspect, the present application provides a method for inhibiting ash and coking in a waste heat boiler in an environmentally friendly boiler, comprising the following steps:
[0019] The boiler coking inhibitor described in any one of the above items is mixed into the fuel of the environmentally friendly boiler, or the boiler coking inhibitor described in any one of the above items is sprayed into the coking area of the waste heat boiler.
[0020] In a fourth aspect, the present application provides a method for inhibiting coking at a platen superheater position in a pulverized coal boiler, comprising the following steps:
[0021] The boiler coking inhibitor described in any one of the above items is mixed into the fuel of the pulverized coal boiler, or the boiler coking inhibitor described in any one of the above items is sprayed into the coking area of the platen superheater.
[0022] 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 ash accumulation and coking problem of waste heat boilers in environmentally friendly boilers, and can also be used to reduce the coking problem at the position of the screen superheater in pulverized coal boilers, and both can have a good inhibitory effect on boiler coking. DETAILED DESCRIPTION
[0023] 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.
[0024] 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.
[0025] 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, which 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.
[0026] 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.
[0027] 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.
[0028] One embodiment of the present application provides a boiler coking inhibitor, comprising the following components in parts by mass:
[0029] 30 to 40 parts of the first material, 30 to 40 parts of the second material, and 30 to 40 parts of a silicon-containing material; the first material includes forsterite; the second material includes at least one of chlorite and serpentine; the silicon-containing material includes at least one of a silica material, mica and vermiculite.
[0030] The above-mentioned boiler coking inhibitor can be used to reduce the ash accumulation and coking problem of waste heat boilers in environmentally friendly boilers, and can also be used to reduce the coking problem at the screen superheater position in pulverized coal boilers. At the same time, the boiler coking inhibitor of the present application has a good inhibitory effect on boiler coking.
[0031] During the research process, the present application found that the process of boiler ash coking 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 ash coking 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 inhibit the boiler coking effect by increasing the melting point of the ash, changing the wettability between the solid and the liquid, physical expansion, lattice distortion, etc.
[0032] 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.
[0033] It is understandable that forsterite is a refractory raw material with magnesium oxide and silicon dioxide as the main components. Its theoretical chemical formula is 2MgO·SiO2 or Mg2SiO4, and it is a kind of olivine mineral. Forsterite usually appears in colors such as olive green, yellow green or green brown. Its Mohs hardness is 6.5~7, its relative density is 3.28g / cm³~3.51g / cm³, and its refractive index is 1.654~1.690. Forsterite belongs to the orthorhombic system, and its crystals are columnar or thick plate-shaped. Common single forms include parallelepiped, rhombic column and rhombic bipyramid.
[0034] 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.
[0035] Serpentine is a hydrous magnesium-rich silicate mineral. It mainly contains magnesium oxide (MgO), silicon dioxide (SiO2) and water (H2O), of which the MgO content is about 43.6%, the SiO2 content is about 43.6%, and the H2O content is about 13.1%. The structural unit layer of the crystal is composed of silicon oxygen tetrahedral sheets and brucite octahedral sheets. The Mohs hardness is 2.5~4.
[0036] Mica is a rock-forming mineral, usually in the form of pseudo-hexagonal flakes or plates, and occasionally in the form of columns. The main components of mica are aluminum silicates of potassium, aluminum, magnesium, iron, lithium, etc.
[0037] 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.
[0038] In some embodiments, the silica material includes at least one of silicon dioxide, microsilica powder, powdered quartz, and fused quartz.
[0039] Microsilica fume, also known as silica fume or silicon powder, is a highly active, amorphous powder. It is a byproduct of the production process of industrial silicon or ferrosilicon alloys, and is mainly produced through high-temperature smelting and rapid cooling. The main component of microsilica fume is silicon dioxide, which can reach more than 90%, and also contains a small amount of impurities such as aluminum oxide and iron oxide. The particle size of microsilica fume is extremely small, usually in the submicron to micron level. Most of the particles are submicron, with an average particle size of about 0.15μm, a specific surface area of up to 15000m² / kg~30000m² / kg, and has a very high surface activity.
[0040] Pink quartz is a non-metallic mineral with unique physical and chemical properties. Its chemical composition is mainly silicon dioxide, which generally reaches 95%~98%, and some can even reach more than 99%. It has fewer impurities and usually contains Fe, Mg, Al, Ca, Li, Na, K, Ge, B, etc. The particle size of pink quartz is mostly below 10μm. It has the characteristics of fine particle size, loose structure, easy processing, strong acid resistance, refractoriness of 1750℃~1832℃, and Mohs hardness of about 7.
[0041] Fused quartz is an amorphous, glassy substance of silicon oxide, also known as synthetic fused quartz or quartz glass. The impurity content in fused quartz can be reduced to extremely low levels, usually in the ppm (parts per million) range. The melting temperature is about 1713°C. The Mohs hardness is 6.0~7.0.
[0042] Optionally, the mass fraction of the first material in the boiler coking inhibitor is 30 parts, 33 parts, 35 parts, 38 parts, 40 parts, 42 parts, 45 parts, 48 parts, 50 parts, 52 parts, 55 parts, 58 parts or 60 parts, or, the mass fraction of the first material in the boiler coking inhibitor may also be within the range between any two of the above mass fractions.
[0043] Optionally, the mass fraction of the second material in the boiler coking inhibitor is 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 31 parts, 33 parts or 35 parts, or the mass fraction of the second material in the boiler coking inhibitor may also be within the range between any two of the above mass fractions.
[0044] Optionally, the mass fraction of silicon-containing material in the boiler coking inhibitor is 20 parts, 22 parts, 24 parts, 26 parts, 28 parts, 30 parts, 31 parts, 33 parts or 35 parts, or, the mass fraction of silicon-containing material in the boiler coking inhibitor may also be within the range between any two of the above mass fractions.
[0045] In some embodiments, the first material, the second material, and the silicon-containing material in the boiler coking inhibitor are equal in mass.
[0046] The boiler coking inhibitor containing the first material, the second material and the silicon-containing material of equal mass can achieve a relatively good inhibitory effect.
[0047] In some embodiments, the following mass percentages of the components are included: 30% to 60% of the first material, 20% to 35% of the second material, and 20% to 35% of the silicon-containing material.
[0048] Optionally, the mass percentage of the first material in the boiler coking inhibitor is 30%, 33%, 35%, 38%, 40%, 42%, 45%, 48%, 50%, 52%, 55%, 58% or 60%, or, the mass percentage of the first material 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 the second material in the boiler coking inhibitor is 20%, 22%, 24%, 26%, 28%, 30%, 31%, 33% or 35%, or the mass percentage of the second material in the boiler coking inhibitor may also be within the range between any two of the above mass percentages.
[0050] Optionally, the mass percentage of silicon-containing material in the boiler coking inhibitor is 20%, 22%, 24%, 26%, 28%, 30%, 31%, 33% or 35%, or, the mass percentage of silicon-containing material in the boiler coking inhibitor may also be within the range between any two of the above mass percentages.
[0051] In some embodiments, the boiler coking inhibitor comprises the following components in mass percentage: 30% to 60% of the first material, 20% to 35% of the second material, and 25% to 35% of the silicon-containing material.
[0052] It can be understood that the components of the boiler coking inhibitor are the following components in the following mass percentages: 30% to 60% of the first material, 20% to 35% of the second material, and 25% to 35% of the silicon-containing material, which means that the boiler coking inhibitor contains only the above three types of raw materials.
[0053] In some embodiments, the first material is forsterite.
[0054] In some embodiments, the second material is at least one of chlorite and serpentine.
[0055] In some embodiments, the silicon-containing material is at least one of a silicon dioxide material, mica, and vermiculite.
[0056] In some embodiments, the particle size of the first material is 400 mesh to 600 mesh.
[0057] Optionally, the particle size of the first material is 400 mesh, 420 mesh, 440 mesh, 460 mesh, 480 mesh, 500 mesh, 520 mesh, 540 mesh, 560 mesh, 580 mesh or 600 mesh, or the particle size of the first material may also be within the range between any two of the above mesh sizes.
[0058] In some embodiments, the particle size of the second material is 200 mesh to 600 mesh.
[0059] Optionally, the particle size of the second material is 200 mesh, 250 mesh, 300 mesh, 350 mesh, 400 mesh, 450 mesh, 500 mesh, 550 mesh or 600 mesh, or the particle size of the second material may also be within the range between any two of the above mesh sizes.
[0060] In some embodiments, the particle size of the silicon-containing material is 325 mesh to 8000 mesh.
[0061] In some embodiments, in the silicon-containing material, the particle size of silicon dioxide, powdered quartz, fused quartz, mica and vermiculite is 325 mesh to 600 mesh.
[0062] In some embodiments, in the silicon-containing material, the particle size of silicon dioxide, powdered quartz, fused quartz, mica and vermiculite is 325 mesh, 350 mesh, 375 mesh, 400 mesh, 450 mesh, 500 mesh, 550 mesh, 575 mesh or 600 mesh, or, in the silicon-containing material, the particle size of silicon dioxide, powdered quartz, fused quartz, mica and vermiculite can also be within the range between any two of the above mesh sizes.
[0063] In some embodiments, the particle size of the microsilica powder is 6000 mesh to 8000 mesh.
[0064] Optionally, the particle size of the microsilica powder is 6000 mesh, 6200 mesh, 6400 mesh, 6600 mesh, 6800 mesh, 7000 mesh, 7200 mesh, 7400 mesh, 7600 mesh, 7800 mesh or 8000 mesh, or, the particle size of the microsilica powder can also be within the range between any two of the above mesh sizes.
[0065] 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.
[0066] In some embodiments, the components of the boiler coking inhibitor are forsterite, chlorite and silicon dioxide in equal amounts.
[0067] The boiler coking inhibitor having the above components can achieve a better effect of reducing the ash accumulation and coking problem of the waste heat boiler in the environmental protection boiler.
[0068] In some embodiments, the components of the boiler coking inhibitor are forsterite, chlorite and vermiculite in equal amounts.
[0069] The boiler coking inhibitor having the above components can achieve a better effect of reducing the coking problem at the platen superheater position in the pulverized coal boiler.
[0070] In some embodiments, the boiler coking inhibitor is a powder.
[0071] 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 fuel or directly sprayed into the coking area of the boiler through compressed air.
[0072] Another embodiment of the present application provides a method for preparing a boiler coking inhibitor, comprising the following steps:
[0073] Mix the following components in parts by mass: 30 to 60 parts of the first material, 20 to 35 parts of the second material, and 20 to 35 parts of a silicon-containing material; the first material includes forsterite; the second material includes at least one of chlorite and serpentine; the silicon-containing material includes at least one of a silica material, mica and vermiculite.
[0074] Another embodiment of the present application provides a method for inhibiting boiler coking, comprising the following steps:
[0075] 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.
[0076] 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.
[0077] Another embodiment of the present application provides a method for inhibiting ash and coking in a waste heat boiler in an environmentally friendly boiler, comprising the following steps:
[0078] Any of the above boiler coking inhibitors is mixed into the fuel of the environmentally friendly boiler, or any of the above boiler coking inhibitors is sprayed into the coking area of the waste heat boiler.
[0079] Another embodiment of the present application provides a method for inhibiting coking at a platen superheater in a pulverized coal boiler, comprising the following steps:
[0080] Any of the above boiler coking inhibitors is mixed into the fuel of a pulverized coal boiler, or any of the above boiler coking inhibitors is sprayed into the coking area of a platen superheater.
[0081] The following are specific embodiments
[0082] Example 1
[0083] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 1 is 33.33% forsterite, 33.33% chlorite, and 33.33% silicon dioxide.
[0084] Example 2
[0085] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 2 is 33.33% forsterite, 33.33% chlorite, and 33.33% microsilica.
[0086] Example 3
[0087] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 3 is 33.33% forsterite, 33.33% chlorite, and 33.33% powder quartz.
[0088] Example 4
[0089] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 4 is 33.33% forsterite, 33.33% chlorite, and 33.33% fused quartz.
[0090] Example 5
[0091] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 5 is 33.33% forsterite, 33.33% chlorite, and 33.33% vermiculite.
[0092] Example 6
[0093] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 6 is 33.33% forsterite, 33.33% chlorite, and 33.33% mica.
[0094] Example 7
[0095] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 7 is 40% forsterite, 30% chlorite, and 30% silicon dioxide.
[0096] Example 8
[0097] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 8 is 30% forsterite, 35% chlorite, and 35% silicon dioxide.
[0098] Example 9
[0099] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 9 is 60% forsterite, 20% serpentine, and 20% silicon dioxide.
[0100] Example 10
[0101] In terms of mass percentage, the composition of the boiler coking inhibitor in Example 10 is 33.33% forsterite, 33.33% serpentine, and 33.33% silicon dioxide.
[0102] Comparative Example 1
[0103] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 1 is 80% forsterite, 10% chlorite, and 10% silicon dioxide.
[0104] Comparative Example 2
[0105] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 2 is 33.33% of sepiolite, 33.33% of chlorite, and 33.33% of silicon dioxide.
[0106] Comparative Example 3
[0107] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 3 is 33.33% forsterite, 33.33% talc, and 33.33% silicon dioxide.
[0108] Comparative Example 4
[0109] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 4 is 80% forsterite, 10% chlorite, and 10% vermiculite.
[0110] Comparative Example 5
[0111] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 5 is 33.33% of sepiolite, 33.33% of chlorite, and 33.33% of vermiculite.
[0112] Comparative Example 6
[0113] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 6 is 33.33% forsterite, 33.33% talc, and 33.33% vermiculite.
[0114] Comparative Example 7
[0115] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 7 is 20% forsterite, 60% chlorite, and 20% silicon dioxide.
[0116] Comparative Example 8
[0117] Calculated by mass percentage, the composition of the boiler coking inhibitor in Comparative Example 8 is 20% forsterite, 20% chlorite, and 60% silicon dioxide.
[0118] Comparative Example 9
[0119] No boiler coking inhibitors are added.
[0120] The raw materials used in the above embodiments are all commercially available powders, and the specific manufacturers and product models are as follows: Forsterite: Xixia County Shengfang Refractory Material Co., Ltd., 500 mesh. Chlorite: Haicheng Hetai Powder Technology Co., Ltd., CP-600, 600 mesh. Serpentine: Jiangxi Yiyang Zhongya Mining Co., Ltd., 200 mesh. Silicon dioxide: Yifeng Mining Technology (Dongyuan) Co., Ltd., 600 mesh, SiO2 content 96%~98%, ordinary white. Microsilica powder: Chengdu Donglanxing Technology Development Co., Ltd., light-colored high-density microsilica powder, 8000 mesh. Powder quartz: Majiang County Jingfa Mining Co., Ltd., 325 mesh. Fused quartz: Lianyungang Hongding Quartz Co., Ltd., 400 mesh Vermiculite: Shijiazhuang Chenxing Industrial Co., Ltd., fine vermiculite, 325 mesh. Mica: Hebei Huayuan Mining Co., Ltd., phlogopite, 400 mesh. Sepiolite: Neixiang County Xinglei Sepiolite Co., Ltd., 400 mesh.
[0121] The components of the above embodiments and comparative examples are shown in the following table:
[0122]
[0123] It can be understood that the sepiolite in the above table refers to the boiler coking inhibitor in which the first material is replaced by sepiolite. The talc in the above table refers to the boiler coking inhibitor in which the second material is replaced by talc.
[0124] The boiler coking inhibitors of the above embodiments and comparative examples are used to treat the ash coking of waste heat boilers in hazardous waste rotary kilns and to treat the coking at the screen superheater position in pulverized coal boilers. Among them, treating the ash coking of waste heat boilers in hazardous waste rotary kilns refers to inhibiting the ash accumulation in the descending flue of the waste heat boiler. After the ash accumulation reaches a fixed thickness, the ash accumulation will be cleaned. The effect of treating the ash coking of waste heat boilers in hazardous waste rotary kilns is characterized by the frequency of online cleaning of the ash accumulation in the ash hopper of the waste heat boiler in the hazardous waste rotary kiln. The effect of treating the coking at the screen superheater position in the pulverized coal boiler is characterized by the screen flue gas temperature drop of the screen superheater of the pulverized coal boiler. The better the treatment effect, the higher the screen flue gas temperature drop. The test results are shown in the following table:
[0125]
[0126] By comparing the test results of each embodiment and comparative example 9, it can be seen that the frequency of online cleaning of ash accumulation in the ash hopper of the waste heat boiler of the hazardous waste rotary kiln in each embodiment is significantly reduced, and the temperature drop of the flue gas screen of the pulverized coal boiler screen superheater is significantly increased, that is, the boiler coking inhibitor of the present application can be used to reduce the ash accumulation and coking problem of the waste heat boiler in the environmentally friendly boiler, and can also be used to reduce the coking problem at the screen superheater position in the pulverized coal boiler, and has a good inhibitory effect on boiler coking.
[0127] By comparing the test results of the embodiments and comparative examples 2, 3, 5 and 6, it can be seen that when the first material or the second material in the boiler coking inhibitor is replaced with other raw materials, the inhibitory effect on boiler coking is poor.
[0128] By comparing the test results of the embodiments and comparative examples 1, 4, 7 and 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.
[0129] At the same time, by comparing the test results of each embodiment, it can be seen that the boiler coking inhibitor with a composition of 33.33% forsterite, 33.33% chlorite and 33.33% silicon dioxide has a significantly better effect on treating the ash accumulation and coking problem of the waste heat boiler in the hazardous waste rotary kiln, and the boiler coking inhibitor with a composition of 33.33% forsterite, 33.33% chlorite and 33.33% vermiculite has a significantly better effect on treating the coking problem at the screen superheater position in the pulverized coal boiler.
[0130] 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.
[0131] 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: 30 to 60 parts of a first material, 20 to 35 parts of a second material, and 20 to 35 parts of a silicon-containing material; the first material comprises forsterite; the second material comprises at least one of chlorite and serpentine; the silicon-containing material comprises at least one of a silica material, mica and vermiculite.
2. The boiler coking inhibitor according to claim 1, characterized in that: The silicon dioxide material includes at least one of silicon dioxide, microsilica powder, powdered quartz and fused quartz.
3. The boiler coking inhibitor according to claim 1, characterized in that: The first material, the second material and the silicon-containing material in the boiler coking inhibitor are equal in mass.
4. The boiler coking inhibitor according to claim 1, characterized in that: The composition comprises the following components in mass percentage: 30% to 60% of the first material, 20% to 35% of the second material, and 20% to 35% of the silicon-containing material.
5. The boiler coking inhibitor according to claim 1, characterized in that: The particle size of the first material is 400-600 mesh; and / or, The particle size of the second material is 200 mesh to 600 mesh; and / or, The particle size of the silicon-containing material is 325 mesh to 8000 mesh.
6. The boiler coking inhibitor according to claim 1, characterized in that: The components of the boiler coking inhibitor are forsterite, chlorite and silicon dioxide of equal mass; or, The components of the boiler coking inhibitor are forsterite, chlorite and vermiculite of equal mass.
7. The boiler coking inhibitor according to any one of claims 1 to 6, characterized in that: The boiler coking inhibitor is a powder.
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 7 is mixed into the fuel of the boiler, or the boiler coking inhibitor according to any one of claims 1 to 7 is sprayed into the coking area of the boiler.
9. A method for inhibiting ash and coking in a waste heat boiler in an environmentally friendly boiler, characterized in that: The steps include: The boiler coking inhibitor according to any one of claims 1 to 7 is added to the fuel of the environmentally friendly boiler, or the boiler coking inhibitor according to any one of claims 1 to 7 is sprayed into the coking area of the waste heat boiler.
10. A method for inhibiting coking at a platen superheater in a pulverized coal boiler, characterized in that: The steps include: The boiler coking inhibitor according to any one of claims 1 to 7 is added to the fuel of the pulverized coal boiler, or the boiler coking inhibitor according to any one of claims 1 to 7 is sprayed into the coking area of the platen superheater.