Practical Technical Measures for Improving Sintering Efficiency and Product Quality of Tunnel Kiln Bricks
The sintering efficiency of tunnel kilns directly determines the production capacity and economic benefit of brick manufacturing enterprises. Many factors including fuel condition, manual operation, kiln structure setting and temperature control will affect the sintering speed and finished product quality. Targeted technical adjustment and standardized management can effectively optimize the sintering process.
Moisture and particle size are two key indicators affecting fuel combustion performance. Excessively wet coal absorbs massive heat for water evaporation in the kiln, prolonging the preheating and ignition time. The caking phenomenon of wet coal further reduces combustion activity and air contact efficiency. Building rainproof coal storage facilities and drying wet coal in advance can fundamentally solve the problem of slow combustion caused by high fuel moisture. In terms of particle size, graded screening and crushing treatment must be implemented for kiln coal to eliminate large coal blocks. Uniform fine-particle fuel ensures full contact with oxygen, accelerates combustion reaction, and reduces kiln fouling and unqualified brick products.
Scientific coal feeding technology is the key to stable and efficient sintering. The traditional extensive feeding mode of less frequent and large-dose coal addition leads to unbalanced oxygen supply and unstable kiln temperature. The standardized operation scheme requires frequent small-dose feeding with a 1.5-minute cycle for full external combustion bricks, with precise feeding dosage matched to different temperature sections. The external fuel supply should be adjusted dynamically according to the internal combustion degree of brick blanks. Reasonable control of kiln bottom fuel deposition at 10% can balance the combustion state of the whole kiln. Mechanical automatic coal feeding equipment has obvious advantages in feeding uniformity, which can effectively reduce fuel waste and improve combustion stability.
Standardized shift management is an important link to maintain consistent sintering quality. Disordered operation of different shifts will cause chaotic fire progression, resulting in repeated temperature fluctuation, increased fuel consumption and inconsistent brick quality. Unifying the operation specifications of all staff can keep the fire advancing speed stable and realize continuous and efficient production. Increasing appropriate excess air on the basis of standard temperature control can optimize the oxidation atmosphere in the kiln, speed up the sintering reaction and improve production efficiency.
Reasonable temperature gradient control is the core technology for sintering internal combustion bricks. Rapid heating in the early stage will seal the surface pores of brick blanks, making it impossible for oxygen to enter the interior to support the combustion of internal fuel. The low-temperature slow heating in the front section of the combustion zone can preserve the pore permeability of brick blanks, ensure sufficient oxygen supply for internal fuel combustion, while high-temperature sintering in the middle and rear sections can completely consume residual internal fuel and eliminate defective bricks. In addition, the hollow brick design can effectively improve the internal oxygen circulation condition, greatly improve the combustion efficiency of high internal combustion bricks, and realize synchronous improvement of sintering speed and product quality.
