What are the technologies for flue gas desulfurization in lime kilns
Lime kilns produce a large amount of exhaust gas containing sulfur dioxide during the production process, which poses a threat to the environment and human health. Therefore, the application of exhaust gas desulfurization technology is crucial. The common desulfurization technologies for lime kiln waste gas currently include wet desulfurization, semi dry desulfurization, and dry desulfurization. These technologies each have their own characteristics and are suitable for different production conditions and environmental requirements.
Wet desulfurization is one of the widely used technologies in the treatment of waste gas from lime kilns, mainly using the limestone gypsum method. This method involves spraying limestone slurry into an absorption tower and reacting it with sulfur dioxide in the exhaust gas to produce gypsum, with a desulfurization efficiency of over 95%. Wet desulfurization technology is mature and stable, but there are issues with wastewater treatment and equipment corrosion risks. The semi dry desulfurization usually adopts the spray drying method, which atomizes the lime slurry and reacts with the waste gas. The desulfurization efficiency is 80% -90%. This method consumes less water and produces waste that is easy to handle, making it suitable for areas with scarce water resources.
Dry desulfurization technology mainly includes activated carbon adsorption method and circulating fluidized bed method. The activated carbon adsorption method utilizes the adsorption performance of activated carbon to remove sulfur dioxide, with a desulfurization efficiency of about 70% -85%, suitable for treating low concentration exhaust gas. The circulating fluidized bed method achieves a desulfurization efficiency of about 90% by fully contacting and reacting the desulfurizer with the exhaust gas in the fluidized bed, and no wastewater is generated. The selection of exhaust gas desulfurization technology for lime kilns needs to comprehensively consider the characteristics of exhaust gas, operating costs, and environmental requirements, ensuring that emissions meet standards while achieving economic feasibility.
With increasingly strict environmental standards, the flue gas desulfurization technology of lime kilns is also constantly innovating. In the future, efficient, low consumption, and non secondary pollution desulfurization technology will become a research and development focus, providing support for the green development of the lime industry. What are the technologies for flue gas desulfurization in lime kilns, and how to optimize existing processes, are still topics that the industry needs to continue exploring.
