Forno a tunnel mobile per mattoni in argilla

Several Hard Injuries of Mobile Ring Tunnel Kiln

La struttura e le caratteristiche del processo produttivo dei forni a tunnel circolari mobili sono diverse dai forni a tunnel generali. Hanno relativamente meno investimenti, tempi di costruzione più brevi, minori costi di produzione, e un minor consumo di energia per la calcinazione rispetto ai forni a tunnel generali. Si sono sviluppati rapidamente negli ultimi dieci anni. Tuttavia, nell'uso pratico, l'effetto non è soddisfacente, e ci sono molti difetti e problemi. Alcuni sono problemi strutturali e di qualità intrinseci, some are process issues limited by the characteristics of this type of kiln, and some are environmental issues, ultimately affecting the output and quality of products. Most mobile circular tunnel kiln manufacturers have poor product quality and high scrap rates. There are multiple reasons for this “problem kiln”, first of all, the mobile circular tunnel kiln itself has some serious problems and defects, and there are several difficult to treat hard wounds:

1. Mobile circular tunnel kilns are not suitable for use in cold winter areas in the north.

The four main processes of brick stacking, essiccazione, roasting, and unloading in this type of kiln are arranged on the circular kiln passage, and operate in a sequential cycle with the circular kiln passage. There are no heating and insulation facilities, and production is mainly carried out in outdoor natural environments. Only rainproof and sunscreen awnings are installed on the kiln. Perciò, during the winter frost period in the north, the mud in the conveyors, mixers, and brick machines of this production line will be frozen into hard blocks and unable to be produced. Especially the wet billets stacked on the circular kiln, which have long been frozen hard and unusable, will definitely be shut down.

Affected by the cold climate, the effective working period of the mobile circular tunnel kiln is only 6-8 months per year, which cannot reach the total annual output. Anyone who chooses this kiln production line in the cold winter regions of the north has seriously affected the output and quality of the products. Its so-called advantage of high output has become an empty statement, leading to poor overall economic benefits throughout the year.

2. Mobile circular tunnel kilns have special requirements for the construction site.

Because its kiln body is a circular arc ring shape, it is placed on two concentric but unequal diameter circular tracks. The cross-section of the kiln has a width of over 13m, including 4.5m, 6.5m, 8.8m, and 10.m8. Its construction land is similar to the land used for the same production scale of a one-time code burning tunnel kiln production line. Tuttavia, the mobile circular tunnel kiln production line requires strict site conditions, and the adaptability of site selection is poor, which limits the flexibility of the overall process design. One is that the site must be a sufficiently large square (circular), e l'altro è che il sito deve essere piatto e livellato, senza la flessibilità e l'adattabilità di una tipica linea di produzione con forno a tunnel.

3. Non soddisfa i requisiti degli standard ambientali pertinenti.

① L'altezza dell'imbuto di scarico (camino) per l'essiccazione e la tostatura le emissioni di gas di scarico non soddisfano gli standard ambientali. L'aspiratore dell'umidità e l'aspiratore dei fumi del forno a tunnel circolare mobile sono tutti installati sul forno mobile e si muovono con il forno. Tutti i ventilatori non sono verticalmente verso l'alto, only the exhaust pipe is installed horizontally, allowing the exhaust gas to be discharged towards the inner side of the circular tunnel through a section of horizontal exhaust pipe. As a result, the exhaust gas diffuses around the factory area, creating a foul atmosphere that not only harms workers but also causes serious pollution to the environment. Some manufacturers have been continuously protested and complained about by surrounding residents, and have been ordered by local environmental protection departments to stop production and rectify.

② The exhaust gas emitted from drying and roasting has not been treated. The fuel used for the calcination products of mobile circular tunnel kilns is coal (banda del carbone, scorie, eccetera.), and the flue gas generated from combustion contains particulate matter such as smoke and dust, as well as gases such as SO2, HF, NOx, CO2, eccetera., which have not been treated with measures such as flue gas purification, dust removal, and desulfurization, causing significant pollution.

4. Thermal system and drying and roasting thermal process issues of mobile circular tunnel kiln.

① The quality of drying is difficult to guarantee, and uneven drying and dehydration may occur due to climate changes such as season, day and night, sunny and cloudy, cold and warm, dry and wet, which can easily lead to network cracks or mute sounds in the product.

② Due to the integrated connection and movement of the drying chamber and calcination kiln in this type of kiln, la velocità di essiccazione della billetta è limitata dalla velocità di cottura del forno di calcinazione, e non può essere regolato e controllato in base ai requisiti del processo di essiccazione della billetta. La temperatura della billetta che entra nel forno di calcinazione è troppo alta o troppo bassa, e l'umidità residua è troppo alta o troppo bassa, che potrebbero causare crepe o suoni muti nel prodotto.