CN107954733A - A kind of original position aluminium borate whisker enhancing CFB boiler high-strength abrasion-proof is moldable - Google Patents

Abstract

The invention discloses an in-situ aluminum borate whisker reinforced CFB boiler high-strength wear-resistant plastic, which belongs to the technical field of high-strength wear-resistant plastic. It is composed of material A and material B, material A is aluminum dihydrogen phosphate liquid rubber material, material B is an inorganic refractory filler composed of boric acid, alumina, corundum aggregate, powder and a small amount of sintering aid, when using material A and Material B is mixed and stirred evenly in a certain proportion, and then applied to the part of the boiler that needs to be repaired. As the temperature of the boiler rises, boric acid and alumina in material B will generate aluminum borate whiskers in situ, and obtain high strength reinforced by aluminum borate whiskers. Fire-resistant and wear-resistant sintered wall surface. After the refractory plastic of the present invention is calcined at 900°C for 3 hours, the compressive strength reaches 147-180MPa and the flexural strength reaches 30-38MPa after testing; compared with the traditional CFB refractory plastic, the present invention The strength of the refractory plastic has been greatly improved, and the price is low, the construction is convenient, and it is suitable for industrial applications.

Description

An in-situ aluminum borate whisker reinforced CFB boiler with high strength and wear-resistant plastic

Technical field:

The invention relates to a method for preparing a high-strength circulating fluidized bed boiler refractory plastic, which is characterized in that the aluminum borate whiskers generated in situ are used to improve the strength of the plastic after sintering, and the temperature range of 900-1000 ° C is relatively high. The repaired CFB boiler inner wall produces high-strength wear protection.

technical background:

Circulating fluidized bed (CFB) boiler technology is a high-efficiency and low-pollution clean combustion technology for low-quality coal such as coal gangue that has developed rapidly in the past ten years. It operates at around 900°C. The principle of the circulating fluidized bed is that low-quality coal gangue is fluidized under the action of wind and circulated for combustion, and limestone is added at the same time to achieve desulfurization during the combustion process. During the operation of the coal circulating fluidized bed boiler, a large amount of fluidized materials are constantly in the high-temperature circulation flow, and a large number of particles will wash away the refractory material on the inner wall of the boiler, making the lining refractory material easy to wear and tear from time to time. Repairs will result in substantial losses. The strength of the currently used repairing materials still needs to be improved. Compared with the previous refractory plastics, the CFB high-alumina refractory plastics of the present invention have higher strength and better wear resistance, and high-strength structures can be obtained at 900-1000 ° C. Improve the repair level of the boiler, extend the warranty period, improve the quality of operation and economic benefits.

Invention content:

In order to achieve the purpose of further improving the strength of traditional refractory materials, the invention provides a method for preparing refractory plastics reinforced by aluminum borate whiskers generated in situ.

The technical scheme adopted by the present invention to solve its technical problems is: the refractory plastic is composed of A material and B material, A material is aluminum dihydrogen phosphate liquid rubber material, and B material is made of boric acid, powdered alumina, nano-alumina, Inorganic refractory filler composed of corundum aggregate, powder and a small amount of sintering aids, when used, material A and material B are mixed and stirred evenly in a certain proportion, and then applied to the part of the boiler that needs to be repaired. Boric acid and alumina generate aluminum borate whiskers in situ to obtain a high-strength refractory and wear-resistant sintered wall reinforced by aluminum borate whiskers.

Technical scheme of the present invention is:

An in-situ aluminum borate whisker reinforced CFB boiler high-strength wear-resistant plastic, which is composed of A material and B material, A material is aluminum dihydrogen phosphate liquid rubber material, B material is made of boric acid, alumina, silica fume, aluminum Inorganic refractory filler composed of calcium acid cement, corundum aggregate, powder and a small amount of sintering aid. When used, material A and material B are mixed and stirred evenly in a certain proportion, and then applied to the part of the boiler that needs to be repaired. As the temperature of the boiler rises, The boric acid in the material B and the powdered alumina generate aluminum borate whiskers in situ to obtain a high-strength refractory and wear-resistant sintered wall reinforced by the aluminum borate whiskers.

Preferably, there is a certain proportion of boric acid and alumina in material B.

Preferably, the proportion of boric acid and alumina is in the range of 1:13-40, more preferably 1:20-30.

Preferably, the alumina is a mixture of nano-alumina and calcined powdered alumina, the ratio range is between 1:5-9, and the particle size of the powdered alumina is 0-10um, preferably 3-5um, Nano-alumina is at 50-500nm, preferably 200-300nm.

Preferably, the A material is characterized in that it is formed by the reaction of a certain proportion of phosphoric acid and aluminum hydroxide or aluminum oxide, wherein the ratio of the amount of phosphorus to aluminum is in the range of 3:0.1-3:1.2, preferably 3:0.8-3:1.0.

Preferably, the inorganic refractory filler is characterized in that it consists of corundum, boric acid, alumina, aluminate cement, silica fume, and sintering aids.

Preferably, the corundum is characterized in that the corundum varieties such as white corundum, brown corundum, and fused dense corundum are 1-3mm corundum aggregate, 0-1mm corundum aggregate and 200-mesh corundum powder.

Preferably, the specific composition of the inorganic refractory filler is:

The sum of the composition of each component is 100%.

Preferably, the sintering aid is characterized in that the inorganic sintering aid is one or more composites of inorganic oxides such as sodium metaaluminate, nickel oxide, iron oxide, copper oxide, and zinc oxide.

Preferably, the high-strength wear-resistant plastic is characterized in that the weight ratio of material B to material A is 100:10-20.

The density of aluminum dihydrogen phosphate solution in material A is 1.60 g/ml. The composition ratio of filler B material is 0-20% 1mm-3mm corundum aggregate; 20%-40% 0mm-1mm corundum aggregate; 0%-10% 200 mesh corundum powder; 30%-45 % powdered alumina and nano-alumina composite; 4%-8% silica fume; 0-4% calcium aluminate cement; 0.75%-3% boric acid, 0-5% sodium metaaluminate, oxide One or more composites of inorganic oxides such as nickel, iron oxide, copper oxide, and zinc oxide.

The usage amount of material A is 12-16% of the total mass of material B.

The method of using the high-strength CFB refractory plastic developed by this patent is as follows: when using, first mix the material B evenly, then add the liquid phase A material in the state of stirring, make it fully mixed, apply it on the part that needs to be repaired, and then compact it After 24 hours of natural drying, it can be sintered with the temperature of the boiler.

Compared with the prior art, it has the following advantages:

The strength of the refractory plastic is greatly improved. At present, the fire-resistant plastic prepared by the present invention is calcined at 900°C for 3 hours. After testing, the compressive strength has reached 147-180MPa, and the flexural strength has reached 30-38MPa. Compared with the traditional CFB refractory plastic, the strength of the material has been greatly improved.

The price is low and the construction is convenient. The refractory plastic of the present invention is convenient for construction. When using it, you only need to mix and stir the B material and the A material according to the ratio of 100:12-16, apply it on the part that needs to be repaired, and then compact it. After curing and drying.

Detailed ways:

The present invention will be further described below in conjunction with embodiment.

Example 1

A high-strength CFB boiler refractory plastic, including filler (B material) and rubber material (A material) with a weight ratio of 100:15.3

The rubber material (material A) is an aluminum dihydrogen phosphate solution with a density of 1.60g/mL

Filler (B material) comprises the component of following weight fraction:

The preparation method comprises the following steps:

Weigh each substance in the filler according to the mass ratio, mix evenly and add 15.3% rubber material and continue mixing to make them stick together to form a refractory plastic with soft construction. The prepared refractory plastic is compacted and solidified in a mold of 40*40*160. After demoulding, it is calcined at 700°C for 3 hours, and the compressive strength reaches 140MPa, and the flexural strength reaches 22MPa. After calcination at 900°C for 3 hours The compressive strength reaches 147MPa, and the flexural strength reaches 30MPa. After being calcined at 1100°C for 3 hours, the compressive strength reaches 172MPa, and the flexural strength reaches 38MPa.

Example 2

A high-strength CFB boiler refractory plastic, including filler (B material) and rubber material (A material) with a weight ratio of 100:15.3

The rubber material (material A) is an aluminum dihydrogen phosphate solution with a density of 1.60g/mL

Filler (B material) comprises the component of following weight fraction:

The preparation method comprises the following steps:

Weigh each substance in the filler according to the mass ratio, mix evenly and add 15.3% rubber material and continue mixing to make them stick together to form a refractory plastic with soft construction. The prepared refractory plastic is compacted and solidified in a mold of 40*40*160. After testing, the compressive strength after calcination at 700°C for 3 hours reaches 152MPa, and the flexural strength reaches 26MPa after calcination at 900°C for 3 hours. The compressive strength reaches 158MPa, the flexural strength reaches 35MPa, and the compressive strength reaches 225MPa after being calcined at 1100°C for 3 hours, and the flexural strength reaches 36MPa.

Example 3

A high-strength CFB boiler refractory plastic, including filler (B material) and rubber material (A material) with a weight ratio of 100:15.3

The rubber material (material A) is an aluminum dihydrogen phosphate solution with a density of 1.60g/mL

Filler (B material) comprises the component of following weight fraction:

Weigh each substance in the filler according to the mass ratio, mix evenly and add 15.3% rubber material and continue mixing to make them stick together to form a refractory plastic with soft construction. The prepared refractory plastic was compacted and solidified in a mold of 40*40*160. The sample was tested and calcined at 700°C for 3 hours. The compressive strength reached 155MPa, and the flexural strength reached 28MPa. Calcined at 900°C for 3 hours After 1 hour, the compressive strength reaches 180MPa, and the flexural strength reaches 36MPa. After being calcined at 1100°C for 3 hours, the compressive strength reaches 210MPa, and the flexural strength reaches 44MPa.

Example 4

A high-strength CFB boiler refractory plastic, including filler (B material) and rubber material (A material) with a weight ratio of 100:15.3

The rubber material (material A) is an aluminum dihydrogen phosphate solution with a density of 1.60g/mL

Filler (B material) comprises the component of following weight fraction:

Weigh each substance in the filler according to the mass ratio, mix evenly and add 15.3% rubber material and continue mixing to make them stick together to form a refractory plastic with soft construction. The prepared refractory plastic was compacted and solidified in a mold of 40*40*160. The sample was tested and calcined at 700°C for 3 hours. The compressive strength reached 138MPa, and the flexural strength reached 26MPa. Calcined at 900°C for 3 hours After one hour, the compressive strength reached 165MPa, and the flexural strength reached 32MPa. After being calcined at 1100°C for 3 hours, the compressive strength reached 180MPa, and the flexural strength reached 38MPa.

Example 5

A high-strength CFB boiler refractory plastic, including filler (B material) and rubber material (A material) with a weight ratio of 100:15.3

The rubber material (material A) is an aluminum dihydrogen phosphate solution with a density of 1.60g/mL

Filler (B material) comprises the component of following weight fraction:

Weigh each substance in the filler according to the mass ratio, mix evenly and add 15.3% rubber material and continue mixing to make them stick together to form a refractory plastic with soft construction. The prepared refractory plastic was compacted and solidified in a mold of 40*40*160. The sample was tested and calcined at 700°C for 3 hours. The compressive strength reached 142MPa, and the flexural strength reached 25MPa. Calcined at 900°C for 3 hours After 1 hour, the compressive strength reached 168MPa, and the flexural strength reached 31MPa. After being calcined at 1100°C for 3 hours, the compressive strength reached 191MPa, and the flexural strength reached 36MPa.

Claims (10)

1. An in-situ aluminum borate whisker reinforced CFB boiler high-strength wear-resistant plastic, characterized in that it is composed of A material and B material, A material is aluminum dihydrogen phosphate liquid rubber, B material is made of boric acid, aluminum oxide , silica fume, calcium aluminate cement, corundum aggregate, powder and a small amount of sintering aids are inorganic refractory fillers. When used, materials A and B are mixed in a certain proportion and evenly applied to the parts that need to be repaired in the boiler. As the temperature of the boiler rises, boric acid and powdered alumina in material B generate aluminum borate whiskers in situ, and a high-strength refractory and wear-resistant sintered wall reinforced by aluminum borate whiskers is obtained. 2. The in-situ aluminum borate whisker-reinforced CFB boiler high-strength wear-resistant plastic according to claim 1 is characterized in that there is a certain proportion of boric acid and aluminum oxide in the B material. 3. The boric acid and aluminum oxide according to a certain ratio according to claim 2, the ratio range is: 1:13-40, preferably 1:20-30. 4. Alumina according to claim 2, which is a mixture of nano-alumina and calcined powdered alumina, the ratio range is between 1:5-9, and the particle size range of powdered alumina is 0-10um, preferably 3 -5um, nano-alumina is at 50-500nm, preferably 200-300nm. 5. A material according to claim 1, characterized in that it is formed by reacting a certain proportion of phosphoric acid and aluminum hydroxide or aluminum oxide, wherein the ratio range of the amount of phosphorus and aluminum is 3:0.1-3:1.2 , preferably 3:0.8-3:1.0. 6. The inorganic refractory filler according to claim 1, characterized in that it consists of corundum, boric acid, alumina, aluminate cement, silica fume, and sintering aids. 7. The corundum according to claim 1, characterized in that the corundum varieties such as white corundum, brown corundum, and fused dense corundum are 1-3mm corundum aggregates, 0-1mm corundum aggregates, and 200-mesh corundum Powder. 8. inorganic refractory filler according to claim 1, its concrete composition is: The sum of the composition of each component is 100%. 9. The sintering aid according to claim 8, characterized in that the inorganic sintering aid is one or more of inorganic oxides such as sodium metaaluminate, nickel oxide, iron oxide, copper oxide, zinc oxide, etc. Complex. 10. The high-strength wear-resistant plastic according to claim 1, characterized in that the weight ratio of material B to material A is 100:10-20.