nuovi punti da considerare nella scelta di un forno a tunnel
1. Seleziona soluzioni tecniche mature per garantire che la linea di produzione raggiunga lo standard e raggiunga la capacità produttiva.
Quando si utilizza il forno a tunnel per bruciare i mattoni, vari parametri utilizzati nella produzione dovrebbero essere determinati in base alle proprietà di base delle materie prime.
La lunghezza, la larghezza e l'altezza del forno sono calcolate in base alla potenza del forno. Quando si calcola la lunghezza, larghezza e altezza del forno, le velocità di riscaldamento e raffreddamento delle materie prime, il tempo di cottura delle materie prime, devono essere considerati la temperatura di cottura più alta e l'intervallo di temperature di cottura. E altri fattori.
2. Disposizione ragionevole del sistema del forno a tunnel per rendere stabile la cottura.
Secondo la definizione di forno a tunnel, forno a tunnel dovrebbe essere dotato di sistema di ventilazione, sistema di combustione del carburante, sistema di ingresso dei veicoli, e sistema di tenuta. Questi sottosistemi costituiscono il sistema di lavoro del forno a tunnel. La stretta collaborazione di ciascun sistema può far funzionare normalmente il forno a tunnel.
Secondo i requisiti dell'atmosfera di cottura nel forno, vengono forniti il numero e la posizione dei ventilatori utilizzati sul forno, la pressione dell'aria dei ventilatori è determinata in funzione della forma dei prodotti cotti e della densità del forno, e il volume di ventilazione dei ventilatori è determinato in base alla potenza.
A seconda del tipo di carburante utilizzato, il metodo del sistema di combustione del carburante, che tipo di apparecchiatura di combustione utilizzare, e la disposizione, la posizione e la quantità delle apparecchiature di combustione dovrebbero rendere la temperatura nel forno il più uniforme possibile. I contenuti principali inclusi nel sistema di accesso sono la modalità di ingresso e l'intervallo di tempo di ingresso.
Il sistema di tenuta comprende la tenuta tra carro forno e corpo forno, la tenuta tra la porta del forno e il corpo del forno, la tenuta tra la tubazione e il corpo del forno, e la sigillatura tra i carri del forno. È isolato per formare un buon spazio di cottura all'interno del forno a tunnel, so that the semi-finished product can be fired into the finished product inside the kiln.
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.
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. Infatti, 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. Infatti, 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: le materie prime sono 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
It is one of the most prominent problems at present to arbitrarily entrust the construction of units without kiln construction qualifications. They lack necessary job training and qualification certification of construction personnel.
