The foundry refractory manufacturer will take you to understand what issues need to be considered in the selection of arch bridge refractory materials

The foundry refractory manufacturer tells you that the sleeve lime kiln has changed the original positive pressure operation mode of the vertical kiln, and now it is changed to negative pressure operation without smoke and dust overflow, which is more conducive to environmental protection requirements; the upper and lower layers are set to be staggered and evenly distributed There are multiple combustion chambers, and each combustion chamber is connected to the inner cylinder through an arch bridge made of refractory materials, so that the high-temperature flue gas generated by combustion can be evenly distributed, so that the stone can be heated evenly.

The stone passes through the preheating zone, the upper countercurrent calcination zone, the middle countercurrent calcination zone, and the lower cocurrent calcination zone to form a combination of countercurrent calcination and parallel calcination to improve the sintering quality and activity of lime. Use the inner cylinder to preheat the combustion-supporting air once, and recover part of the flue gas to preheat through the heat exchanger to reduce energy consumption. High degree of automation, simple operation and convenient adjustment.
The foundry refractory manufacturer tells you that due to the high flame temperature in the combustion chamber, the arch bridge part is easy to collapse, which affects the service life of the kiln body, and also seriously affects the quality of lime produced and the smooth progress of steelmaking production, which will also lead to a large amount of refractory materials The range increases; heat exchanger tube bundles and circulation channel tubes are prone to fouling and clogging, which is difficult to clean; the combustion system and control system have high operating requirements, and improper operation may easily cause high flue gas temperature at the top of the kiln, which is not conducive to facility maintenance.
The foundry refractory manufacturer tells you that the collapse of the arch bridge requires not only the improvement and optimization of the structure of the arch bridge, but also the selection of refractory materials. In the early stage, magnesia bricks were used as linings, and later they were changed to magnesia-chrome bricks or magnesia-aluminum spinel linings due to collapse problems. For the lining, high-strength composite ceramic wear-resistant materials with good wear resistance can also be used. The following factors need to be considered in the selection of arch bridge refractory materials:
1. Select the refractory material according to the sintering atmosphere in the kiln, and it is wear-resistant and corrosion-resistant;
2. Consider the load-bearing and construction factors of the arch bridge;
The clogging of heat exchangers is a difficult problem. At present, some domestic enterprises use chemical reagents to react with dirt, and then wash with high-pressure water; or mix cold air to reduce the inlet temperature of heat exchangers, which can reduce the dust content of heat exchangers. Concentration, more importantly, it is necessary to optimize and improve the structure of the heat exchanger.
The foundry refractory manufacturer tells you to add an exhaust gas analyzer and an online calorific value meter to the control system of the sleeve kiln. Through the online detection of exhaust gas and coal gas, the working status can be fed back in time, so that the operator can adjust the working parameters of the lime kiln in time. The premise is that the combustion Equipment needs to ensure combustion control.
The foundry refractory manufacturer tells you that the lower part of the upper inner sleeve, the outer wall of the lower section of the lower inner sleeve steel pipe, the top diversion cap at the upper end of the lower inner sleeve, and the top of the arch bridge are seriously damaged. High-strength ceramics with good wear resistance can be used for wear-resistant casting Repair and maintenance can be carried out by using materials, which can quickly solve maintenance problems and resume production.