The sintering flue gas circulation process is a new process developed in recent years, and there is a distinction between inner circulation and outer circulation. The internal circulation process is complicated, and it is necessary to add a sintering fan and supporting multi-tube dust removal, which can not only reduce flue gas emissions and use the low-temperature waste heat of flue gas, but also effectively increase production; the external circulation process is simple, which can reduce flue gas emissions and utilization The low-temperature waste heat of the flue gas, but the output of the sintering machine has not been significantly improved. Therefore, in order to increase the output, reduce the amount of external flue gas and use the waste heat, most customers use the internal circulation method; some customers simply use the external circulation method to reduce the flue gas volume and use the waste heat.

　　With the development of sintering technology and the improvement of the level of pelletizing of sintering raw materials, the air permeability of the entire sintered material layer has also become better. Adding a sintering flue gas circulation fan can increase the combustion air temperature of the sintering machine and increase the air permeability of the material layer. Increase the output of sinter.

　　The main fuel for sintering is coke powder, which consumes about 50kg per ton of sintered ore. The temperature of the circulating flue gas of the sintering flue gas cycle can reach 150-200°C, which contains a large amount of sensible heat, so the usage of coke powder can be reduced. According to the data of many customers of our company, under the same conditions, each ton of sintered ore can use less coke powder at 1.5～2.5kg

　　After adopting the sintering flue gas internal circulation, if the full sintering flue gas circulation is adopted, under the condition of the same output, the amount of external flue gas exhaust will be reduced (usually the amount involved in the flue gas circulation is about 25-30% of the total flue gas. In the same way, the external flue gas is 70-80% of the original flue gas volume). Due to the reduction of the external flue gas volume, the load of the corresponding flue gas treatment equipment (electric dust removal, desulfurization and de-sales, etc.) equipment is reduced. In the case of increasingly stringent environmental protection requirements, and the reduction of pollutant emissions, environmental protection equipment can operate more efficiently and meet higher environmental protection requirements.

　　The flue gas recycling process of sintering machine and ring cooler can effectively improve the quality of sintered ore, reduce the emission of pollutants in dust and exhaust gas, and can use part of the secondary combustion of CO in the flue gas, which saves fuel and reduces CO emissions. It can effectively reduce NOX emissions.

　　According to market changes and customer requirements, our company actively explores ideas and optimizes product structure. It has completed the high-quality construction of sintering machines and circulating cooler flue gas circulation systems for many enterprises in Shanxi, Hebei, Shandong and Henan. After use, it can be used in the original With the same structure of the sintering machine, it can not only improve the output and quality of sintered ore, but also meet the country's increasingly strict environmental protection and enterprise energy-saving high standards, which is well received by customers.