Composition structure of refractory lining in industrial furnace
Although there are many types of industrial furnaces, in terms of basic structure, they mainly include three parts: ① heating system: includes equipment systems that provide various heat sources to materials in industrial furnaces. Such as: energy medium pipes and equipment systems, power transmission system transformer equipment, etc .: ② Industrial furnace body: This is the basic structure of industrial furnaces. Generally includes frame support structure, furnace structure, material conveying system, etc. ③Fume exhaust system: It mainly includes flue, chimney, heat exchanger, and exhaust auxiliary equipment. ④ Other supporting equipment.
The basis for completing the road building materials to the furnace lining structure when designing the furnace lining structure of industrial furnaces is the key procedure to achieve the purpose of equipment technology. Here mainly introduces the furnace lining structure with refractory as the main material. In the design process of the furnace lining, the following aspects need to be paid attention to:
(1) Reasonable furnace size. This is determined by the production process served by the industrial furnace. The furnace size is subject to process requirements and overall equipment design. The size of the furnace is the basic condition of the industrial furnace production process. The reasonableness of the furnace lining size directly affects the production of the entire process.
(2) Stable structural form. Due to the special use of industrial furnaces, the furnace lining is generally heated on one side. When the furnace lining is in such an extreme temperature difference environment for a long time, or structural damage occurs, or stress deforms, or it forms on the hot surface, the furnace lining structure will be greatly tested. Therefore, the stability of the furnace lining structure is a key indicator of the furnace lining design.
(3) Economical and effective material allocation.
Generally speaking, the inner lining structure of industrial furnaces mainly has 4 forms: (1) refractory brick masonry: (2) amorphous refractory lining (3) refractory ceramic fiber lining: (4) mixed lining .
(1) Refractory brick masonry
Refractory brick masonry is composed of refractory brick and refractory mud. It is the most traditional and most widely used form of masonry structure in industrial furnace body structure. When using refractory bricks to construct or construct the structure of an industrial furnace body, first of all, refractory bricks and refractory mud should be selected according to the design or original structural requirements. Then the masonry structure was completed in accordance with the design drawings. There are generally masonry made of refractory bricks, which are mainly used in walls, furnace roofs, furnace bottoms and pipes in industrial furnace body structures.
(2) Unshaped refractory lining
The so-called amorphous refractory lining means that the main material constituting the furnace lining is an amorphous refractory. These amorphous refractory materials mainly include: refractory castable, refractory plastic, refractory spray paint and so on.
When the refractory castable is used as the main material of the furnace body structure, it is used for the working layer of the furnace body structure, such as side walls, furnace roof, pipe lining and outer cladding, and also for the working layer and the steel structure of the furnace (such as the furnace shell). As insulation layer.
Refractory plastic. In theory, refractory plastics can replace the function of refractory bricks in the main structure of various industrial furnaces. However, in practical applications, the following issues need to be studied before making a decision.
① Type and form of furnace: melting furnace, reaction furnace or heating furnace:
② Furnace structure: furnace top, side wall or furnace bottom: construction thickness: with or without insulation material: height and load of the furnace wall, etc .:
③ The operation of the furnace: the furnace temperature and its changes, whether the operation mode is continuous or intermittent, the state of the material being heated makes it solid or liquid or gaseous, and the impact load in the furnace:
④ Economy and construction conditions. In the actual industrial furnace body structure, the most widely used refractory plastic is in the furnace roof and furnace wall.
Refractory spray paint. Because spraying construction has the advantages that it can be formed at any angle, any position, and any geometric shape, the lining body formed by spray coating is often used in the design of the furnace lining of industrial furnaces.
Because the characteristics of spray paint are basically the same as those of the castable, the structural form is also the same as the castable lining. The parts used in the industrial furnace body include the furnace wall, the roof, the lining wall of the pipe, and the insulation layer. In order to stabilize the structure of the spray paint liner, different types of metal anchors or anchor bricks are usually provided in the liner according to the specific structural requirements.
(3) Refractory ceramic fiber lining
As a semi-finished raw material, refractory ceramic fiber is in a loose shape, and can be processed into finished products such as fiber blankets, fiber ropes, fiber paper, fiberboard, and fiber fastening (folding module or laminated module). Paint or fiber castable. Ceramic fibers can be used directly in a loose form, but when they exist as a lining, ceramic fibers are often processed into blankets, boards or ties.
Therefore, in existing industrial kiln linings, it can basically be determined that refractory materials must be used to protect the shell from melting changes.
Although there are many types of industrial furnaces, in terms of basic structure, they mainly include three parts: ① heating system: includes equipment systems that provide various heat sources to materials in industrial furnaces. Such as: energy medium pipes and equipment systems, power transmission system transformer equipment, etc .: ② Industrial furnace body: This is the basic structure of industrial furnaces. Generally includes frame support structure, furnace structure, material conveying system, etc. ③Fume exhaust system: It mainly includes flue, chimney, heat exchanger, and exhaust auxiliary equipment. ④ Other supporting equipment.
The basis for completing the road building materials to the furnace lining structure when designing the furnace lining structure of industrial furnaces is the key procedure to achieve the purpose of equipment technology. Here mainly introduces the furnace lining structure with refractory as the main material. In the design process of the furnace lining, the following aspects need to be paid attention to:
(1) Reasonable furnace size. This is determined by the production process served by the industrial furnace. The furnace size is subject to process requirements and overall equipment design. The size of the furnace is the basic condition of the industrial furnace production process. The reasonableness of the furnace lining size directly affects the production of the entire process.
(2) Stable structural form. Due to the special use of industrial furnaces, the furnace lining is generally heated on one side. When the furnace lining is in such an extreme temperature difference environment for a long time, or structural damage occurs, or stress deforms, or it forms on the hot surface, the furnace lining structure will be greatly tested. Therefore, the stability of the furnace lining structure is a key indicator of the furnace lining design.
(3) Economical and effective material allocation.
Generally speaking, the inner lining structure of industrial furnaces mainly has 4 forms: (1) refractory brick masonry: (2) amorphous refractory lining (3) refractory ceramic fiber lining: (4) mixed lining .
(1) Refractory brick masonry
Refractory brick masonry is composed of refractory brick and refractory mud. It is the most traditional and most widely used form of masonry structure in industrial furnace body structure. When using refractory bricks to construct or construct the structure of an industrial furnace body, first of all, refractory bricks and refractory mud should be selected according to the design or original structural requirements. Then the masonry structure was completed in accordance with the design drawings. There are generally masonry made of refractory bricks, which are mainly used in walls, furnace roofs, furnace bottoms and pipes in industrial furnace body structures.
(2) Unshaped refractory lining
The so-called amorphous refractory lining means that the main material constituting the furnace lining is an amorphous refractory. These amorphous refractory materials mainly include: refractory castable, refractory plastic, refractory spray paint and so on.
When the refractory castable is used as the main material of the furnace body structure, it is used for the working layer of the furnace body structure, such as side walls, furnace roof, pipe lining and outer cladding, and also for the working layer and the steel structure of the furnace (such as the furnace shell). As insulation layer.
Refractory plastic. In theory, refractory plastics can replace the function of refractory bricks in the main structure of various industrial furnaces. However, in practical applications, the following issues need to be studied before making a decision.
① Type and form of furnace: melting furnace, reaction furnace or heating furnace:
② Furnace structure: furnace top, side wall or furnace bottom: construction thickness: with or without insulation material: height and load of the furnace wall, etc .:
③ The operation of the furnace: the furnace temperature and its changes, whether the operation mode is continuous or intermittent, the state of the material being heated makes it solid or liquid or gaseous, and the impact load in the furnace:
④ Economy and construction conditions. In the actual industrial furnace body structure, the most widely used refractory plastic is in the furnace roof and furnace wall.
Refractory spray paint. Because spraying construction has the advantages that it can be formed at any angle, any position, and any geometric shape, the lining body formed by spray coating is often used in the design of the furnace lining of industrial furnaces.
Because the characteristics of spray paint are basically the same as those of the castable, the structural form is also the same as the castable lining. The parts used in the industrial furnace body include the furnace wall, the roof, the lining wall of the pipe, and the insulation layer. In order to stabilize the structure of the spray paint liner, different types of metal anchors or anchor bricks are usually provided in the liner according to the specific structural requirements.
(3) Refractory ceramic fiber lining
As a semi-finished raw material, refractory ceramic fiber is in a loose shape, and can be processed into finished products such as fiber blankets, fiber ropes, fiber paper, fiberboard, and fiber fastening (folding module or laminated module). Paint or fiber castable. Ceramic fibers can be used directly in a loose form, but when they exist as a lining, ceramic fibers are often processed into blankets, boards or ties.
Therefore, in existing industrial kiln linings, it can basically be determined that refractory materials must be used to protect the shell from melting changes.
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