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CN-115900351-B - Heat insulation brick for rotary kiln made of heat insulation materials with multilayer structures

CN115900351BCN 115900351 BCN115900351 BCN 115900351BCN-115900351-B

Abstract

The invention relates to the technical field of refractory bricks, in particular to a heat-insulating brick for a rotary kiln with a multi-layer structure heat-insulating material, which comprises a brick body, wherein the brick body is provided with a hollow area in the thickness direction, the hollow area is filled with the heat-insulating material, the brick body is back to kiln body inside one side surface seted up the back groove, and this back groove runs through along the brick body thickness direction, back filler that is used for heat retaining is filled to back inslot portion. The heat-insulating brick has the advantages of good heat shock stability of the magnesium-aluminum brick, higher load softening temperature, stronger heat-insulating capability and greatly reduced energy consumption of a transition zone.

Inventors

  • YAO CHAO
  • QU DIANLI
  • TAN SHANGRONG
  • LIU ZECHEN

Assignees

  • 辽宁科技大学

Dates

Publication Date
20260505
Application Date
20221103

Claims (7)

  1. 1. The multi-layer structure heat insulation material heat insulation brick for the rotary kiln is characterized by comprising a brick body, wherein a hollow area is formed in the thickness direction of the brick body, a heat insulation material is filled in the hollow area, a back groove is formed in the surface of one side of the brick body, which is back to the kiln body, and penetrates through the back groove along the thickness direction of the brick body, and a back filler for heat insulation is filled in the back groove; The hollow area comprises a first hollow area which is positioned in the middle of the brick body and is of an equilateral triangle shape, one tip of the first hollow area faces the surface where the back groove is located, two second hollow areas are further arranged between the surfaces where the first hollow area and the back groove are located, the second hollow areas are of right-angled triangles, the two second hollow areas are respectively arranged on the left side and the right side of the first hollow area and are symmetrically arranged, the longest edge of the second hollow areas is approximately parallel to the side edge of the first hollow area adjacent to the longest edge of the second hollow area, and the acute angle of the surface where the second hollow areas are adjacent to the back groove is 60 degrees; hollow microspheres made of heat-resistant materials are filled in the first hollow area and/or the second hollow area; The back filler is provided with two layers of heat insulation materials, wherein the thickness of the heat insulation material filled near the bottom of the back groove is 1cm-1.5cm, the heat conductivity coefficient is 0.02W/m.K, the working temperature is 1000 ℃, the thickness of the heat insulation material filled near the opening of the back groove is 0.5-1cm, the heat conductivity coefficient is 0.02W/m.K, the working temperature is 600 ℃, and the aerogel heat insulation material and the aerogel felt are bonded through refractory clay.
  2. 2. The multi-layer heat insulating brick for rotary kiln according to claim 1, wherein the first hollow area and the second hollow area occupy 20% -25% of the surface area.
  3. 3. The multi-layer heat insulating brick for rotary kiln according to claim 1, wherein the brick body is 220mm in size, 65mm in size, 14cm-16cm in side length of the first hollow area, and 8cm-10cm in length of the longest side of the second hollow area.
  4. 4. The multi-layer heat insulating brick for rotary kiln according to claim 1, wherein the brick body has a porosity of 15-18% and is prepared by firing high-purity magnesite, fused magnesia-alumina spinel and fused magnesia with different particle sizes in proportion, and the softening temperature under load is above 1580 ℃.
  5. 5. The multi-layer heat insulating brick for rotary kiln according to claim 1, wherein the number of the back grooves is 3-6.
  6. 6. The multi-layer heat insulating brick for rotary kiln according to claim 1, wherein the back grooves have a width of 35mm and a depth of 1cm-2cm, the thickness is equal to the thickness of the brick body, and the two adjacent back grooves are spaced by 8mm-9mm.
  7. 7. The multi-layer heat insulating brick for rotary kiln of claim 6 wherein the total area of the openings of the back slots is 80-85% of the area of the back slots.

Description

Heat insulation brick for rotary kiln made of heat insulation materials with multilayer structures Technical Field The invention relates to the technical field of refractory bricks, in particular to a heat-insulating brick for a rotary kiln made of a multi-layer heat-insulating material. Background With the rapid development of the world cement industry, refractory bricks for cement kilns have made remarkable progress in both types and quality. The rotary kiln has different atmosphere environment, working temperature and other parts, so that the refractory bricks used in different parts of the rotary kiln, such as a decomposing zone, a transition zone, a cooling zone and the like, are different. The refractory bricks in the firing belt not only need high refractoriness, strong slag erosion resistance and good thermal shock resistance, but also need high-temperature strength, and meanwhile, higher cost performance is also expected. At present, the common refractory brick for the transition zone of the rotary cement kiln is a magnesia-alumina brick, and is characterized by good thermal shock stability and higher softening temperature under load. However, the problem that the magnesium-aluminum brick has too high heat conductivity and poor heat preservation capability cannot be solved at present, and the defect is that the energy consumption of a transition zone of the rotary kiln is increased and the resource waste is caused. Currently, the above problems seriously affect the technical progress of the industry of calcining cement clinker, and have become an important problem for limiting the development of the cement industry. Disclosure of Invention In order to solve the problems, the invention provides the heat-insulating brick for the rotary kiln made of the multi-layer heat-insulating material, which has the advantages of good heat shock stability of the magnesium-aluminum brick, higher load softening temperature, stronger heat-insulating capability and greatly reduced energy consumption of a transition zone. In order to achieve the above purpose, the invention adopts the following technical scheme: The utility model provides a multilayer structure insulating material insulating brick for rotary kiln, includes the brick body, and the brick body has seted up the fretwork district in its thickness direction, and this fretwork district intussuseption is filled with and is used for insulating material, the back groove has been seted up to the inside one side surface of kiln body dorsad, and this back groove runs through along the brick body thickness direction, the inside back filler that is used for heat retaining of packing of back groove. Preferably, the hollowed-out area comprises a first hollowed-out area of an equilateral triangle positioned in the middle of the brick body, one pointed end of the first hollowed-out area faces towards the surface where the back groove is positioned, two second hollowed-out areas are further arranged between the surfaces where the first hollowed-out area and the back groove are positioned, the second hollowed-out areas are of right-angled triangles, the two second hollowed-out areas are respectively arranged on the left side and the right side of the first hollowed-out area and are symmetrically arranged, the longest edge of the second hollowed-out areas is approximately parallel to the side edge of the first hollowed-out area adjacent to the side edge of the first hollowed-out area, and the acute angle of the surface where the second hollowed-out area is adjacent to the back groove is 60 degrees. Preferably, hollow beads made of heat-resistant materials are filled in the first hollow area and/or the second hollow area. Preferably, when the first hollow area and the second hollow area occupy 20% -25% of the surface area. Preferably, the brick body is 220mm in size, 198mm in size and 65mm in size, the side length of the first hollow area is 14cm-16cm, and the length of the longest side of the second hollow area is 8cm-10cm. Preferably, the porosity of the brick body is generally 15% -18%, and the brick body is prepared by firing high-purity magnesia, fused magnesia-alumina spinel, fused magnesia and the like with different granularities in proportion, wherein the softening temperature under load is more than 1580 ℃. Preferably, the number of the back grooves is 3-6. Preferably, the width of the back groove opening is 35mm, the depth is 1cm-2cm, the thickness is equal to the thickness of the brick body, and the distance between two adjacent back grooves is 8mm-9mm. Preferably, the total area of the openings of the back grooves accounts for 80% -85% of the area of the surface where the openings of the back grooves are located. Preferably, the back filling material is provided with two layers of heat insulation materials, wherein the filling thickness of the heat insulation material near the bottom of the back groove is 1cm-1.5cm, the heat conduction coefficient is about 0.02