Design of Lime Kiln Decarbonization Purification System
Lime kilns, also known as lime calcining kilns, are a type of rotary kiln used in the calcination of limestone, which is mainly composed of kiln body, support device, transmission device, seal and other components. Lime kilns are widely used in industrial production lines for the production of various acids and alkalis, inorganic salt production and insulation materials. During the calcination of limestone, there will be a large amount of dust generated from the calcined material. These dusts not only affect the environmental air quality, but also cause the enterprise to suffer production losses and the workers to suffer excessive labor intensity. Therefore, the design of a lime kiln exhaust gas purification system becomes very necessary.
The classic lime kiln decarbonization purification system is composed of a three-stage water-sealed dry cyclone, a wet electrostatic precipitator, a oxidation dedusting tower and a beakplane dust collector. First, the exhaust gas from the kiln enters the first stage of the cyclone dust collector, and the relatively heavy dust is separated and removed here. The dust-containing gas passes through the second-stage cyclone dust collector to remove the dust particles again, and then enters the SCR wet electrostatic precipitator for secondary purification. Exhaust gas enters the oxidation dedusting tower for oxidation purification and substantial dust removal, then enters the fourth-stage inclined-plate dust collector for fine dust removal. Finally, after the exhaust gas is further processed by the activated carbon adsorption tower and the chimney, only clean exhaust gas is discharged into the atmosphere.
In addition, the design of the lime kiln decarbonization purification system should consider the following factors. First, the shape, height and cross-section shape of the chimney should be designed as far as possible to reduce the back pressure and ensure that the clean gas emission is unobstructed. Secondly, attention should be paid to the selection of dust collectors, oxidation dedusting towers and other components in the system, the airflow, inlet and outlet temperatures, wind speed and noise index should be reasonably matched to reduce the operating cost and ensure that the purification effect meets the design requirements. Finally, the online monitoring system should be configured in the whole system to collect and monitor the data from the purified flue gas, and feedback the data to the design colleagues for analysis and timely adjustment.
In summary, the design of a lime kiln decarbonization purification system should consider both the purification effect and the use cost. The design should meet the requirements of environmental protection, safety and efficiency. Only in this way can the design of the system be put into practical use, and the commercial benefits of the user can be maximized.
