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CN-121994028-A - Heat insulation and energy saving method of rotary kiln

CN121994028ACN 121994028 ACN121994028 ACN 121994028ACN-121994028-A

Abstract

The invention discloses a heat insulation and energy saving method of a rotary kiln, which is characterized in that a light thermal vibration protective coating of a carrier rocket is applied to the outside of the rotary kiln for the first time, and the continuous exploration and optimization are carried out on a coating process, and the steps comprise surface cleaning, sand blasting, primer spraying, intermediate paint spraying and finishing paint spraying. The rotary kiln heat loss reducing device has the advantages that the heat loss of the rotary kiln is effectively reduced, the energy utilization efficiency is obviously improved, the thermal stress of the rotary kiln caused by severe temperature change is effectively relieved, the maintenance period is prolonged, the production cost is reduced, and the energy conservation and emission reduction are realized.

Inventors

  • XUE DALIANG
  • ZHANG XI
  • XUE YUTING

Assignees

  • 云南旭森节能科技有限公司

Dates

Publication Date
20260508
Application Date
20260319

Claims (10)

  1. 1. The heat insulation and energy saving method of the rotary kiln is characterized by comprising the following steps: s1, cleaning the surface, namely cleaning the external surface of the rotary kiln to remove impurities attached to the surface; S2, sand blasting treatment, namely performing sand blasting treatment on the surface of the rotary kiln; S3, spraying a primer, namely spraying a layer of high-temperature resistant primer on the surface of the rotary kiln, wherein the thickness of a dry film of the primer is 50-80 mu m, and drying and curing for 2-4 hours at room temperature; S4, spraying intermediate paint, namely after the primer is completely dried and cured, spraying the intermediate paint on the surface of the primer, wherein the dry film thickness of the intermediate paint is 80-120 mu m, and after the intermediate paint is sprayed, putting the rotary kiln into a baking oven at 60-80 ℃ for drying for 1-2 h; s5, coating a finish paint, namely after the intermediate paint is dried and cooled to room temperature, uniformly scraping a layer of finish paint on the surface of the intermediate paint, wherein the thickness of the layer of finish paint is 1-1.5 mm, the included angle between a scraper and the surface is 30-45 degrees during scraping, then spraying a layer of finish paint on the surface, accurately adjusting the thickness and flatness of the finish paint to enable the total thickness of the finish paint to reach 2-3 mm, and naturally drying the finish paint for 7-10 d in a room temperature environment after finishing the finish paint coating.
  2. 2. The method for insulating heat and saving energy of the rotary kiln according to claim 1, wherein the specific method of sand blasting in the step S2 is characterized in that quartz sand with the granularity of 80-120 meshes is used, compressed air with the pressure of 0.5-0.8MPa is used for driving the quartz sand to impact the surface of the rotary kiln at a high speed for 20-40min, so that the surface roughness of the rotary kiln reaches Ra 6.3-Ra 12.5 mu m.
  3. 3. The heat-insulating and energy-saving method for the rotary kiln according to claim 1, wherein the pressure of the spray gun is 0.3-0.5MPa when the primer is sprayed in the step S3 and the intermediate paint is sprayed in the step S4, the distance between the spray gun and the surface of the rotary kiln is 200-300mm, and the moving speed of the spray gun is 10-15 m/min.
  4. 4. The heat-insulating and energy-saving method for the rotary kiln according to claim 1, wherein the pressure of the spray gun is 0.4-0.6MPa when the finish paint is sprayed in the step S5, and the distance between the spray gun and the surface of the rotary kiln is 250-350 mm.
  5. 5. The heat-insulating and energy-saving method for the rotary kiln according to claim 1, wherein the step S5 is characterized by further comprising the step S6 of adhering a heat-insulating layer after finishing paint is coated, namely adhering a heat-insulating layer on the surface of the finishing paint.
  6. 6. The method for heat insulation and energy saving of a rotary kiln according to claim 5, wherein the heat preservation layer is aluminum silicate fiber board.
  7. 7. The method of heat insulation and energy saving for a rotary kiln according to claim 6, wherein the step S6 is further characterized by comprising the step of arranging an anti-scouring surface layer, wherein a layer of high-temperature-resistant adhesive is sprayed on the surface of the heat preservation layer, the heat preservation layer is solidified for 24 hours at normal temperature after spraying, and then the temperature is raised stepwise, the temperature is raised by 50 ℃ per hour, and crystallization of the high-temperature-resistant adhesive is promoted to form a compact protection layer.
  8. 8. The heat-insulating and energy-saving method for the rotary kiln according to claim 7, wherein the dry film thickness of the high-temperature-resistant adhesive is 1mm-3mm.
  9. 9. The method for heat insulation and energy saving of the rotary kiln according to claim 1, wherein the surface cleaning in the step S1 is carried out by flushing the surface of the rotary kiln by using a high-pressure water gun under the water pressure of 5-8 MPa.
  10. 10. The method of claim 1, wherein the top-coat paint used in the step S5 is added with 0.5-1.5% of dispersant and 0.3-0.8% of leveling agent.

Description

Heat insulation and energy saving method of rotary kiln Technical Field The invention relates to the technical field of rotary kilns, in particular to a heat insulation and energy saving method of a rotary kiln. Background The rotary kiln is used as core thermal equipment in the key industries of metallurgy, chemical industry, building materials and the like, and the surface temperature of the cylinder body is generally in the interval range of 80-230 ℃ during the continuous operation. A large amount of heat energy is scattered into the surrounding environment through the surface of the cylinder body, so that the environment temperature is too high, potential damage is caused to on-site operators, peripheral equipment, instruments and the like, serious waste of energy is caused, and the production cost is greatly increased. The prior rotary kiln adopts heat preservation measures mainly comprising traditional heat preservation materials such as rock wool and glass wool, and has the defects of poor heat preservation effect and short service life. Therefore, developing a novel rotary kiln heat preservation technology with high-efficiency heat insulation performance and ultra-long and durable performance has become a key problem to be overcome in the current industrial field. Disclosure of Invention The invention aims to solve the technical problem of providing the heat-insulating and energy-saving method of the rotary kiln with good heat-insulating effect and long maintenance period. In order to solve the technical problems, the technical scheme of the invention is a heat insulation and energy saving method of a rotary kiln, which comprises the following steps: s1, cleaning the surface, namely cleaning the external surface of the rotary kiln to remove impurities attached to the surface; S2, sand blasting treatment, namely performing sand blasting treatment on the surface of the rotary kiln; S3, spraying a primer, namely spraying a layer of high-temperature resistant primer on the surface of the rotary kiln, wherein the thickness of a dry film of the primer is 50-80 mu m, and drying and curing for 2-4 hours at room temperature; S4, spraying intermediate paint, namely after the primer is completely dried and cured, spraying the intermediate paint on the surface of the primer, wherein the dry film thickness of the intermediate paint is 80-120 mu m, and after the intermediate paint is sprayed, putting the rotary kiln into a baking oven at 60-80 ℃ for drying for 1-2 h; s5, coating a finish paint, namely after the intermediate paint is dried and cooled to room temperature, uniformly scraping a layer of finish paint on the surface of the intermediate paint, wherein the thickness of the layer of finish paint is 1-1.5 mm, the included angle between a scraper and the surface is 30-45 degrees during scraping, then spraying a layer of finish paint on the surface, accurately adjusting the thickness and flatness of the finish paint to enable the total thickness of the finish paint to reach 2-3 mm, and naturally drying the finish paint for 7-10 d in a room temperature environment after finishing the finish paint coating. The finishing paint used in the step S5 is a carrier rocket light thermal vibration protective paint developed by Zhoushan aerospace new material Co., ltd, and the paint has extremely low heat conductivity coefficient which is less than or equal to 0.05W/(m.K) at the standard 25 ℃ environment temperature. The excellent high temperature resistance is still another remarkable advantage of the paint. It can stably operate for a long time in a high temperature environment of 600 ℃ or more without any performance degradation phenomenon. The coating exhibits excellent reflectivity to heat radiation, and the reflectivity to heat radiation is more than or equal to 85%. The primer and the intermediate paint in the step S3 and the step S4 are matched with the light thermal vibration protective coating of the carrier rocket. Further, the specific method of sand blasting in the step S2 is that quartz sand with the granularity of 80-120 meshes is used, compressed air with the pressure of 0.5-0.8MPa is used for driving the quartz sand to impact the surface of the rotary kiln at a high speed for 20-40min, and the surface roughness of the rotary kiln reaches Ra 6.3-Ra 12.5 mu m. Furthermore, the pressure of the spray gun is 0.3-0.5MPa when the step S3 is used for spraying the primer and the step S4 is used for spraying the intermediate paint, the distance between the spray gun and the surface of the rotary kiln is 200-300mm, and the moving speed of the spray gun is 10-15 m/min Furthermore, the pressure of the spray gun is 0.4-0.6MPa when the finish paint is sprayed in the step S5, and the distance between the spray gun and the surface of the rotary kiln is 250-350 mm. Further, after finishing paint is coated in the step S5, the method further comprises a step S6 of adhering an insulation layer, namely adhering the insulatio