Key Tunnel Kiln Thermal Control Techniques and Solutions to Brick Stack Collapse Faults
In the commercial brick production industry, tunnel kiln thermal system adjustment is an indispensable technical means to improve finished brick quality and production efficiency. It is a standardized production technology that optimizes the internal thermal environment of the kiln by adjusting adjustable production factors, fully adapting to the firing process requirements of different brick and tile products.
Practical tunnel kiln temperature regulation operations cover multiple key links of kiln operation. On the basis of stable kiln equipment, production workers adjust the operating frequency of the three major ventilation and heat dissipation equipment: exhaust heat fans, smoke exhaust devices and kiln door fans. In addition, precise control of pipeline valve opening, reasonable matching of kiln car operating speed, and scientific top coal feeding are adopted to dynamically balance the kiln internal temperature and realize intelligent thermal management.
Stable tunnel kiln operation relies on four rigid production standards.
First, green brick internal combustion heat value must be kept uniform, avoiding local overheating or insufficient heat caused by uneven heat supply.
Second, the temperature of the preheating, firing and cooling zones must be kept within the allowable error range to ensure consistent brick firing effect.
Third, a fixed kiln feeding schedule must be implemented; without changing product specifications and internal heat ratio, the kiln car entry interval is fixed to ensure stable heat absorption of green bricks.
Fourth, the physical and chemical properties of fired bricks must be stable to avoid product quality fluctuations caused by thermal system changes.
Brick stack collapse fault is a major bottleneck restricting continuous production of tunnel kilns. Once the fault occurs, the kiln has to stop operation, resulting in production shutdown and economic losses. Moreover, high-temperature kiln maintenance is accompanied by high safety hazards, which greatly increases the operational risk of brick factories.
Through long-term production practice, the industry has summarized four root causes of brick stack collapse. Poor manual and mechanical brick stacking leads to unstable stack structure; continuous operation of kiln cars will loosen the stacks and cause collapse. Inadequate drying treatment leads to excessive green brick water content, reducing the structural firmness of brick stacks. Deformation and settlement of kiln running rails cause kiln car inclination, making brick stacks squeeze and collide with kiln walls and collapse. Falling refractory bricks on the kiln body will block the gap between the stack and the kiln, causing structural damage to the brick stack. Operators must suspend kiln feeding immediately once abnormal stack operation is found, and conduct comprehensive inspection and troubleshooting.
To completely solve the problem of brick stack collapse and stabilize kiln thermal operation, targeted improvement measures are formulated. First, upgrade the brick drying production line to strictly control the moisture index of green bricks before kiln entry. Second, standardize the whole process of brick stacking, adhere to the flat, straight and stable stacking standards, and strictly check stack quality before feeding. Third, establish a regular maintenance mechanism for kiln infrastructure, regularly detect the deformation of kiln rails and the damage of kiln wall and top refractory bricks, and repair and replace damaged parts in a timely manner.
FAQ
Q1: What standards must be met for tunnel kiln normal firing operation?
A: Stable green brick heat value, qualified and stable kiln zone temperature, fixed kiln feeding schedule, and stable product physical and chemical indicators are four mandatory standards.
Q2: How does high green brick moisture affect tunnel kiln production?
A: Excessive moisture will reduce brick stack stability and easily cause collapse; it will also affect kiln temperature balance and reduce finished brick quality.
Q3: What maintenance work is required for daily tunnel kiln operation?
A: Daily maintenance includes fan and pipeline valve inspection, kiln rail deformation detection, refractory brick damage inspection, and green brick quality testing.
Q4: How to improve the stability of tunnel kiln brick stacking?
A: Adhere to flat, straight and stable stacking principles, control green brick moisture, and ensure flat and stable kiln rail operation.
