nouveaux points à prendre en compte lors du choix d'un four tunnel

1. Sélectionner des solutions techniques matures pour s'assurer que la ligne de production atteint la norme et atteint la capacité de production.

Lorsque vous utilisez un four tunnel pour brûler des briques, divers paramètres utilisés dans la production doivent être déterminés en fonction des propriétés de base des matières premières.

La puissance de cuisson du four est que les indicateurs de performance du produit cuit répondent aux exigences de la norme nationale, pas seulement combien est tiré, et la sortie du four est de combien. Certains produits cuits au four ne mesurent que 3 mm à 4 mm de surface, mais l'intérieur n'est pas complètement cuit. Ces produits qui ne répondent pas aux exigences de la norme nationale ne peuvent pas être utilisés comme base de calcul de la puissance du four tunnel.

La durée, la largeur et la hauteur du four sont calculées en fonction de la sortie du four. Lors du calcul de la longueur, largeur et hauteur du four, les vitesses de chauffage et de refroidissement des matières premières, le temps de cuisson des matières premières, la température de cuisson la plus élevée et la plage de température de cuisson doivent être prises en compte. Et d'autres facteurs.

2. Disposition raisonnable du système de four tunnel pour rendre la cuisson stable.

Selon la définition du four tunnel, le four tunnel doit être équipé d'un système de ventilation, système de combustion de carburant, système d'entrée de véhicule, et système d'étanchéité. Ces sous-systèmes constituent le système de travail du four tunnel. La coopération étroite de chaque système peut faire fonctionner le four tunnel normalement.

Selon les exigences de l'atmosphère de cuisson dans le four, le nombre et la position des ventilateurs utilisés sur le four sont équipés, la pression d'air des ventilateurs est déterminée en fonction de la forme des produits cuits et de la densité du four, et le volume de ventilation des ventilateurs est déterminé en fonction de la puissance.

Selon le type de carburant utilisé, la méthode du système de combustion de carburant, quel type d'équipement de combustion utiliser, et la position de disposition et la quantité d'équipements de combustion doivent rendre la température dans le four aussi uniforme que possible. Les principaux contenus inclus dans le système d'entrée sont le mode d'entrée et l'intervalle de temps d'entrée.

Le système d'étanchéité comprend l'étanchéité entre le wagon du four et le corps du four, l'étanchéité entre la porte du four et le corps du four, l'étanchéité entre la canalisation et le corps du four, et l'étanchéité entre les wagons du four. Il est isolé pour former un bon espace de cuisson à l'intérieur du four tunnel, afin que le produit semi-fini puisse être cuit dans le produit fini à l'intérieur du four.

3. Recognize the importance of kiln car and ensure the stable quality of fired products.

The kiln car is an indispensable equipment in the production process of the tunnel kiln, and it is also the key equipment related to the performance of the tunnel kiln and whether it can be used normally.

In order to make the kiln car play the role of key equipment, the first thing is to maintain a good seal between the kiln car and the tunnel kiln body, so as to completely isolate the inside of the kiln from the outside of the kiln, so that the cold air outside the kiln cannot enter at will In the kiln, the hot air in the kiln will not leak into the kiln, so that the firing process in the kiln can be carried out smoothly.

Deuxièmement, the seal between the kiln cars should also be reliable, the reason is as mentioned above. Third, the operation of the kiln car should be stable, so as to avoid the occurrence of such phenomena as kiln collapse, uneven firing, and difficulty in entering the car. Fourth, the thermal insulation layer on the kiln car is very important. If the thermal insulation layer of the kiln car has a good thermal insulation effect, the temperature in the kiln will be consistent, the quality of the fired products will be uniform, and the color will be the same. If the thermal insulation effect of the kiln car is not good, Alors, the temperature difference between the upper and lower sides of the kiln will be large, and the fired products will be cooked on the top and cooked on the bottom, or cooked on the top and under the coke. In short, the product quality is uneven and the color difference is large.

Some factories have been in operation for less than a year, and the kiln car often has problems and needs to be replaced, which not only increases production costs, but also changes the understanding of tunnel kilns, and feels that tunnel kilns are inferior to other kilns. En fait, the root cause is the insulation layer of the kiln car, and the seemingly simple insulation layer problem has not been properly handled.

Some kiln cars did not reduce the thickness and material of the thermal insulation layer, but the thermal insulation effect was still very poor. Why is the temperature under some tunnel kiln cars only 40℃~50℃, people can check it smoothly under the car, while the temperature under some cars is so high that people can’t get into the car at all. En fait, the reason is very simple, it is caused by the gap in the insulation layer of the kiln car.

1. Construction materials must be guaranteed.

In the design process of the kiln, the material properties and usage requirements of various materials are considered, and the usage position and thickness of the materials are calculated. In order to ensure the construction quality, the use position and amount of materials shall not be arbitrarily changed during the construction process, nor the variety and quality grade of the materials used.

If it is to be replaced, the strength grade of the structural material must be higher than that of the original design material, and the thermal conductivity of the insulation material to be replaced must be lower than that of the original material.

2. Construction according to design requirements.

In the process of using the tunnel kiln, the technical requirements that should be met in the construction process, the construction difficulty and the solutions are fully considered. Many norms and standards are used in the design, including national standards and norms, provincial and ministerial-level standards and norms, local-level standards and norms, and industry standards and norms.

In the construction requirements, specific requirements are put forward for each part. These requirements are in line with the requirements of the construction specifications and standards. If you want to change them, you must refer to the corresponding items of the specifications and standards, and make changes according to the requirements of the specifications and standards. Change.

Problems and lessons in tunnel kiln construction

As we all know, there are three principles to produce good fired bricks: les matières premières sont la base, kiln equipment is the key, and management is the foundation. If it is not designed, the materials used are inferior, and the construction is arbitrarily commissioned, the kiln will become the biggest obstacle to the sustainable development of the production enterprise. There are the following fatal problems in the reconstruction and new construction of tunnel kilns, which should be paid great attention by colleagues in the whole industry:

1. The furnace design is unreasonable

Some enterprises do not pay attention to the process design of sintering kilns. There are generally simple kiln structures, unscientific drying kiln structures, and unreasonable air duct design, so that various tunnel kilns of different lengths appear in front of us. In order to meet the owner’s blind request to reduce the cost, many tunnel kilns are overweight and weak.

2. Most construction teams are unqualified, and the construction quality is worrying

C'est l'un des problèmes les plus importants à l'heure actuelle de confier arbitrairement la construction d'unités sans qualification de construction de four. Ils manquent de la formation professionnelle nécessaire et de la certification des qualifications du personnel de construction.