Lanthanum oxide large-specification ceramic heat accumulator and preparation process thereof

Abstract

Provided is a lanthanum oxide large-specification ceramic heat accumulator. The lanthanum oxide large-specification ceramic heat accumulator is characterized in that the heat accumulator is of a column structure, a plurality of hole channels penetrating through the column are arranged in the heat accumulator, the heat accumulator is formed by sintering inorganic powder and an additive, and the inorganic powder is prepared from, by weight, 30-50 parts of aluminum titanate, 40-50 parts of Al2O3, 3-8 parts of mullite, 3-9 parts of zirconium oxide, 2-4 parts of silicon nitride, 3-5 parts of boron nitride, 3-9 parts of ganister sand and 1-3 parts of lanthanum oxide. The lanthanum oxide large-specification ceramic heat accumulator has good forming performance and shape keeping performance. The formula and a production method are adopted, the hole channels of the heat accumulator are dense, the wall thickness is small and is only 1 mm, the section size is large and is larger than 100 cm<2>, the draw ratio is large, the length reaches 1,000 mm, and all the hole channels have the advantages of being small in resistance, less in accumulated dust, not likely to be blocked, good in dust removal performance and the like.

Description

technical field

[0001] The invention belongs to the field of industrial energy-saving and emission-reduction equipment, and in particular relates to a large-scale ceramic regenerator made of lanthanum oxide and a preparation process thereof. Background technique

[0002] Regenerative combustion technology has been widely used in industrial furnaces, and one of its technical cores is high-temperature heat storage honeycomb body. Regenerative honeycomb ceramics have replaced traditional regenerative balls and checker bricks due to their good heat storage and release performance, high temperature performance and thermal shock resistance. When in use, the high-temperature flue gas and low-temperature gas (such as air gas) pass through the regenerator alternately in opposite directions by reversing the direction, so that the regenerator continuously absorbs heat and releases heat, and acts as a heat exchange medium to achieve flue gas and air gas. purpose of heat exchange. The ...

Examples

Embodiment 1

[0015] The preparation process of the lanthanum oxide large-scale ceramic regenerator has an external dimension of 150mm×150mm and a length of 500mm. The preparation process is as follows: the cross-section of the regenerative honeycomb body is square; (1) dry mixing, firstly add the inorganic powder into the ball mill, dry mix for 4 hours, pass through a 100-mesh sieve, the inorganic powder includes the following weight ratio Components: 31 parts of aluminum titanate, Al 2 o 3 41 parts, 4 parts of mullite, 4 parts of zirconia, 2 parts of silicon nitride, 3 parts of boron nitride, 3 parts of silicon powder, 1 part of lanthanum oxide; (2) Add additives, the additive ingredients are methyl cellulose 2 parts by weight, 1 part by weight of hydroxyethyl cellulose, 1 part by weight of cyanoethyl cellulose, 1 part by weight of polyvinyl alcohol, 1 part by weight of polyethylene oxide, and 2 parts by weight of propylene glycol; (3) kneading, in a kneader Add water and lubricating oi...

Embodiment 2

[0018] The lanthanum oxide large-scale ceramic regenerator has a square cross-section, a size of 150mm×150mm, and a length of 1000mm. The preparation process is as follows: the cross-section of the regenerative honeycomb body is square; (1) dry mixing, firstly add the inorganic powder into the ball mill, dry mix for 6 hours, pass through the 80-mesh sieve, the inorganic powder includes the following weight ratio Components: 33 parts of aluminum titanate, Al 2 o 342 parts, 5 parts of mullite, 5 parts of zirconia, 3 parts of silicon nitride, 4 parts of boron nitride, 6 parts of silicon powder, 3 parts of lanthanum oxide; (2) Add additives, the additive ingredients are methyl cellulose 3 parts by weight, 1 part by weight of cyanoethyl cellulose, 2 parts by weight of polyvinyl alcohol, and 2 parts by weight of polypropylene glycol; (3) Kneading, adding water and lubricating oil while stirring in the kneader, when kneading, after adding 400kg of material , add water in 3 times wh...

Embodiment 3

[0021] The cross-section of the lanthanum oxide large-scale ceramic regenerator is rectangular, the overall size is 150mm×100mm, and the length is 800mm. In a ball mill, dry-mix for 3 hours, pass through a sieve of 80 mesh, and the inorganic powder includes the following components in weight ratio: 35 parts of aluminum titanate, Al 2 o 3 45 parts, 6 parts of mullite, 5 parts of zirconia, 4 parts of silicon nitride, 4 parts of boron nitride, 6 parts of silicon powder, 3 parts of lanthanum oxide; (2) Add additives, the additive ingredients are hydroxyethyl cellulose 5 parts by weight, 2 parts by weight of polyvinyl alcohol, 1 part by weight of polyethylene oxide, and 3 parts by weight of (polyethylene glycol 400); (3) Kneading, adding water and lubricating oil while stirring in the kneader, when kneading, After adding 400kg of material, stir for 15 minutes, then add half of the water, continue stirring for 5 minutes, add half of the rapeseed oil, add the remaining water and rap...

technical field

[0001] The invention belongs to the field of industrial energy-saving and emission-reduction equipment, and in particular relates to a large-scale ceramic regenerator made of lanthanum oxide and a preparation process thereof. Background technique

[0002] Regenerative combustion technology has been widely used in industrial furnaces, and one of its technical cores is high-temperature heat storage honeycomb body. Regenerative honeycomb ceramics have replaced traditional regenerative balls and checker bricks due to their good heat storage and release performance, high temperature performance and thermal shock resistance. When in use, the high-temperature flue gas and low-temperature gas (such as air gas) pass through the regenerator alternately in opposite directions by reversing the direction, so that the regenerator continuously absorbs heat and releases heat, and acts as a heat exchange medium to achieve flue gas and air gas. purpose of heat exchange. The ...

Examples

Embodiment 1

[0015] The preparation process of the lanthanum oxide large-scale ceramic regenerator has an external dimension of 150mm×150mm and a length of 500mm. The preparation process is as follows: the cross-section of the regenerative honeycomb body is square; (1) dry mixing, firstly add the inorganic powder into the ball mill, dry mix for 4 hours, pass through a 100-mesh sieve, the inorganic powder includes the following weight ratio Components: 31 parts of aluminum titanate, Al 2 o 3 41 parts, 4 parts of mullite, 4 parts of zirconia, 2 parts of silicon nitride, 3 parts of boron nitride, 3 parts of silicon powder, 1 part of lanthanum oxide; (2) Add additives, the additive ingredients are methyl cellulose 2 parts by weight, 1 part by weight of hydroxyethyl cellulose, 1 part by weight of cyanoethyl cellulose, 1 part by weight of polyvinyl alcohol, 1 part by weight of polyethylene oxide, and 2 parts by weight of propylene glycol; (3) kneading, in a kneader Add water and lubricating oi...

Embodiment 2

[0018] The lanthanum oxide large-scale ceramic regenerator has a square cross-section, a size of 150mm×150mm, and a length of 1000mm. The preparation process is as follows: the cross-section of the regenerative honeycomb body is square; (1) dry mixing, firstly add the inorganic powder into the ball mill, dry mix for 6 hours, pass through the 80-mesh sieve, the inorganic powder includes the following weight ratio Components: 33 parts of aluminum titanate, Al 2 o 342 parts, 5 parts of mullite, 5 parts of zirconia, 3 parts of silicon nitride, 4 parts of boron nitride, 6 parts of silicon powder, 3 parts of lanthanum oxide; (2) Add additives, the additive ingredients are methyl cellulose 3 parts by weight, 1 part by weight of cyanoethyl cellulose, 2 parts by weight of polyvinyl alcohol, and 2 parts by weight of polypropylene glycol; (3) Kneading, adding water and lubricating oil while stirring in the kneader, when kneading, after adding 400kg of material , add water in 3 times wh...

Embodiment 3

[0021] The cross-section of the lanthanum oxide large-scale ceramic regenerator is rectangular, the overall size is 150mm×100mm, and the length is 800mm. In a ball mill, dry-mix for 3 hours, pass through a sieve of 80 mesh, and the inorganic powder includes the following components in weight ratio: 35 parts of aluminum titanate, Al 2 o 3 45 parts, 6 parts of mullite, 5 parts of zirconia, 4 parts of silicon nitride, 4 parts of boron nitride, 6 parts of silicon powder, 3 parts of lanthanum oxide; (2) Add additives, the additive ingredients are hydroxyethyl cellulose 5 parts by weight, 2 parts by weight of polyvinyl alcohol, 1 part by weight of polyethylene oxide, and 3 parts by weight of (polyethylene glycol 400); (3) Kneading, adding water and lubricating oil while stirring in the kneader, when kneading, After adding 400kg of material, stir for 15 minutes, then add half of the water, continue stirring for 5 minutes, add half of the rapeseed oil, add the remaining water and rap...

Images