Dry Roasting Equipment---Tunnel Roasting Kiln---Straight Tunnel Kiln---Masonry Tunnel Kiln

Xi'an Research and Design Institute of Wall & Roof Materials Co,.Ltd.
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China main port
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1 m²
Supply Capability:
50 m²/month
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Product Description:

Tunnel roasting kiln can be divided into straight tunnel kiln (with kiln car) and mobile rotary tunnel kiln (without kiln car). Straight tunnel kilns can be further divided into masonry tunnel kilns and prefabricated tunnel kilns in terms of construction methods. The mobile rotary tunnel kiln belongs to the assembled tunnel kiln.

Straight Tunnel Kiln:

(1)   Main products: sintered bricks, common bricks, porous bricks, hollow bricks/blocks, roof tiles, hollow wall panels.


(2)   According to the different output, the inner width of the tunnel kiln is divided into the following types:

the inner width is 3.6 and 3.7 meters, suitable for daily output of 150,000-200,000 blocks, and annual output of 50-66 million (common bricks)

the inner width is 4.6 and 4.8 meters, suitable for daily output of 210,000-250,000 blocks, and annual output of 69-82 million (common bricks)

the inner width is 5.4 and 5.6 meters, suitable for daily production of 260,000-300,000 pieces, and annual output of 85-100 million (common bricks)

the inner width is 6.9 and 7.2 meters, suitable for daily output of 310,000-400,000 blocks, and annual output of 102-132 million (common bricks)

the inner width is 9.2 and 9.4 meters, suitable for daily output of 600,000-620,000 pieces, and annual output of 165-200 million (common bricks)


(3)   Kiln Body Structure

Masonry Tunnel Kiln:

The kiln wall is a composite wall, and the innermost layer is the working layer in contact with the high temperature. It is usually built with refractory materials (common bricks can be sintered below 600°C). The materials, grades and specifications of the refractory materials used are determined according to the firing temperature of the kiln. The middle layer is the thermal insulation layer, which is composed of various lightweight thermal insulation materials. The selected lightweight thermal insulation materials should not only provide thermal insulation, but also maintain long-term safe use without damage. The outermost layer is a load-bearing protective layer, which is multi-purpose sintering. This layer is mostly built with sintered common bricks and porous bricks to protect the lightweight thermal insulation material from damage and to bear the load of the kiln roof and the transverse thrust of the vault.

The roof of the kiln is a composite kiln item, which is hoisted on site. Commonly used kiln roof structures are refractory fiber module + refractory fiber blanket + sealed castable + steel beam; clay refractory slab + high alumina hanger + refractory fiber blanket + sealed castable + steel beam; light mullite Brick + high-aluminum hanging column + refractory fiber blanket + sealing castable + steel beam.

      (4) Firing temperature: 950-1050

      (5) Firing cycle: 26-40h

      (6) Length of tunnel kiln: 110-170m

      (7) Length and size of kiln car: It is determined according to the size of the billet stack and the internal and external combustion method. The length and size of the commonly used kiln car are: 3600mm, 3900mm, 4100mm, 4200mm, 4350mm, 4800mm, etc.

      (8) Firing method: all internal combustion roasting; all external combustion roasting; combined internal and external combustion roasting.

     (9) The roasting kiln is often equipped with a smoke exhaust system, a combustion system, a waste heat system, a backburning system, a cooling system, and a bottom pressure balance system. Each system consists of fans, pipes and regulating valves. The kiln has a large section, high output, small temperature difference between sections, and good thermal insulation performance. Computer automatic monitoring and control system to ensure the stability of thermal parameters and roasting quality


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Q:What are the common types of dryers?
The belt dryer consists of a number of individual unit segments, each of which includes a circulating fan, a heating device, a separate or common fresh air extraction system and an exhaust gas extraction system. The amount of drying medium, temperature, humidity and exhaust cycle
Q:What is a combination of drying equipment?
Recently, a combination of different drying methods and different drying principles has been widely used, and a drying device capable of exerting their own advantages and making up their respective shortcomings.
Q:What are the characteristics of the drum dryer?
According to the dry material is heated, the current rotary drum dryer can be divided into five types, that is, direct Heating dryer, indirect heating dryer, compound heating dryer, steam calcining dryer, spray granulation drying machine.
Q:Frozen sublimation drying equipment which consists of several systems
Frozen Sublimation Drying equipment consists of refrigeration system, vacuum system, heating system and control system.
Q:The development prospects of the dryer
Compared with the adsorption dryer, the cold and dry machine is relatively energy efficient in its applicable field. But the cold and dry machine in the small load operation also exists "big horse car" energy waste phenomenon. People want the cold and dry power consumption can follow the load changes and adjust themselves to achieve the best energy saving effect,
Q:What is the best drying equipment?
Through the filter to make hot air purification, and then by the left shunt plate to the layers, so that the average hot air through each layer of dry material.
Q:How to choose the right drying equipment and drying technology
In the drying process of materials, different materials are not the same characteristics, drying requirements are not the same, drying methods are also different, how to choose the right drying equipment and it?
Q:What are the basic types of common drying equipment?
(3) drum scraper dryer drum scraper dryer is through the rotation of the cylinder, heat conduction way, will be attached to the outer wall of the cylinder liquid material or ribbon material, a dry continuous operation of equipment The The material to be dried is passed from the upper tank into the receptacle of the drum dryer. The drying drum is driven at the specified speed by the drive.
Q:What are the common drying methods?
Is the use of moisture to remove gas, liquid, solid material in a small amount of water, due to moisture dehumidifier dehumidification capacity is limited, only used to remove trace moisture in the material, so the production of very little.
Q:How to solve the dryer a series of failures
On the other hand, after the dryer was replaced, the dew point immediately peaked, indicating that the dryer was not adequately cooled before it was so well that it could not adsorb moisture well and that the dew point of the dryer would be reduced to normal after cooling. If the dryer is cooled properly, it will cause the temperature to peak. The sudden change in temperature will reduce the drying ability of the desiccant to heat-sensitive materials such as ionomers, amorphous polyesters and certain nylon grades.

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