Anti-coking coating and preparation process thereof

An anti-coking and coating technology, applied in coatings, devices for coating liquid on the surface, etc., can solve the problems of lower melting point, difficulty in achieving complete combustion, lower combustion chamber temperature, etc., and achieve high temperature resistance and wear resistance Excellent high temperature and chemical stability, strong effect of high temperature oxidation resistance

Active Publication Date: 2022-03-18
宜兴瑞泰耐火材料工程有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

2. Uneven fineness of pulverized coal: too fine or too coarse may cause coking
3. Mixing ratio of fuel and air: If the amount of air in the boiler is insufficient during the combustion process, it is difficult to achieve complete combustion, resulting in lower melting point and formation of coking
4. Air leakage during boiler operation: Air leakage operation will reduce the temperature of the combustion chamber, delay the combustion process, raise the center of the flame, and elongate the flame, causing the temperature of the flue gas at the furnace outlet to rise, and it is easy to form over-screen coking
The anti-coking coating of this patent is mainly a zirconia-alumina-magnesia system. At high temperatures, alumina-magnesia usually undergoes a eutectic reaction with basic oxides to form a low eutectic point phase, which affects the high temperature of the coating. Erosion resistance, therefore, the coating still has limitations in practical application

Method used

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  • Anti-coking coating and preparation process thereof
  • Anti-coking coating and preparation process thereof
  • Anti-coking coating and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] An anti-coking coating, calculated in parts by mass, the raw material formula is:

[0035]

[0036]

[0037] The particle size range of the molybdenum carbide powder is 0.088-0.044mm;

[0038] The complex oxide includes Al 2 o 3 , ZrO 2 、Cr 2 o 3 , where Al 2 o 3 , ZrO 2 、Cr 2 o 3 , the ratio range mass ratio is 15:2:7;

[0039] The particle size range of the compound oxide is 0.044-0.002mm;

[0040] Al in the compound oxide 2 o 3 Tabular alumina, ZrO 2 Monoclinic zirconia, Cr 2 o 3 is chrome green;

[0041] The antioxidant is metal silicon and metal aluminum powder, and the metal silicon is nano metal silicon powder with a particle size of 500-20nm;

[0042] The molar ratio of the metal silicon powder and metal aluminum powder is 1:5;

[0043] The binding agent is aluminum sol; the surfactant is sodium hexametaphosphate.

[0044] When configuring the anti-coking coating, put the binder and dispersant into the water according to the required ratio...

Embodiment 2

[0051] An anti-coking coating, calculated in parts by mass, the raw material formula is:

[0052]

[0053]

[0054] The particle size range of the molybdenum carbide powder is 0.088-0.044mm;

[0055] The complex oxide includes Al 2 o 3 , ZrO 2 、Cr 2 o 3 , where Al 2 o 3 , ZrO 2 、Cr 2 o 3 , the ratio range mass ratio is 15:2:7;

[0056] The particle size range of the compound oxide is 0.044-0.002mm;

[0057] Al in the compound oxide 2 o 3 It is tabular corundum;

[0058] ZrO in the compound oxide 2 is monoclinic zirconia;

[0059] Cr in the compound oxide 2 o 3 is chrome green;

[0060] Described antioxidant is metal silicon and metal aluminum powder;

[0061] The metal silicon is nano metal silicon powder with a particle size of 500-20nm;

[0062] The molar ratio of the metal silicon powder and metal aluminum powder is 1:5;

[0063] The binding agent is aluminum sol;

[0064] Described surfactant is sodium tripolyphosphate.

[0065] When configurin...

Embodiment 3

[0072] An anti-coking coating, calculated in parts by mass, the raw material formula is:

[0073]

[0074] The particle size range of the molybdenum carbide powder is 0.088-0.044mm;

[0075] The complex oxide includes Al 2 o 3 , ZrO 2 、Cr 2 o 3 , where Al 2 o 3 , ZrO 2 、Cr 2 o 3 , the ratio range mass ratio is 15:2:7;

[0076] The particle size range of the compound oxide is 0.044-0.002mm;

[0077] Al in the compound oxide 2 o 3 It is tabular corundum;

[0078] ZrO in the compound oxide 2 is monoclinic zirconia;

[0079] Cr in the compound oxide 2 o 3 is chrome green;

[0080] Described antioxidant is metal silicon and metal aluminum powder;

[0081] The metal silicon is nano metal silicon powder with a particle size of 500-20nm;

[0082] The molar ratio of the metal silicon powder and metal aluminum powder is 1:5;

[0083] The binding agent is aluminum sol;

[0084] The surfactant is a naphthalene-based high-efficiency water reducer.

[0085] When co...

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Abstract

Molybdenum carbide, lithium oxide and zirconium boride are used as main raw materials, and a compound oxide, an antioxidant, a binding agent and the like are used as auxiliary materials. A coating formed after the coating is constructed has the advantages of high wear resistance, coking resistance, acid and alkali corrosion resistance and the like in a high-temperature service environment, does not crack or fall off under the condition of cold and hot alternation, has excellent high-temperature and chemical stability, and is suitable for coking resistance of coal-fired boilers, kilns and the like in electric power, metallurgy, petrifaction and other industrial and mining enterprises.

Description

technical field [0001] The invention relates to an anti-coking coating and a preparation process thereof, belonging to the field of inorganic non-metal material coatings. Background technique [0002] With the continuous development of electric power technology, large-capacity thermal power units are more and more favored by users, and more and more supercritical units are running. The corresponding problem of boiler coking has become the most serious problem that plagues the safe operation of boilers. Especially in the boiler's downcomer, superheater, reheater, cold ash hopper, return riser, furnace mouth and other parts, it is easy to coke during operation. As the operation time goes by, there will be more and more coke. The thickening of the coke in the downcomer of the boiler and the superheater will directly affect the steam temperature, the outlet temperature of the furnace, and the exhaust gas temperature of the boiler, and even cause the tube wall to overheat, direct...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D7/61C09D7/48B05D7/24
CPCC09D1/00C09D7/61C09D7/48B05D7/24
Inventor 邵开君俞小平陈松林杨力张林俞盛魏瀚钱军峰
Owner 宜兴瑞泰耐火材料工程有限公司
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