Integrated desulfurization and denitration
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There are a wide variety of technologies available for desulfurization and denitrification today. The traditional methods include limestone-based desulfurization and SCR denitrification, while various integrated technologies have also emerged. What are people’s thoughts on integrated technologies?
It’s all done using ammonia water; it’s feasible
It’s not all ammonia; I’ve come across methods that use sodium (not the double-alkali method), with oxidants being employed. By-product fertilizer. There is also an integrated technology that uses ammonia together with an organic catalyst and an oxidant.
At present, the integration of desulfurization and NOx removal mainly refers to the functions of the desulfurization tower; SNCR is used for boiler modifications. It seems that in the context of integrated desulfurization and NOx removal, efforts are focused on the tower itself: limestone desulfurization + oxidation + neutralization； The biggest challenge here is out-of-stock situations, as the by-products formed depending on the oxidant vary greatly, directly affecting the environment; moreover, the operating conditions are extremely poor ； Furthermore, desulfurization and denitrification processes and equipment are two different things; what’s most important at present is to design a well-structured integrated tower based on this process in order to avoid major flaws ； I am involved in manufacturing the slurry circulation pipes for fiberglass towers, which are used in desulfurization and denitrification processes; I also work on fiberglass desulfurization towers ； Those interested are welcome to get in touch: jzgrp@hotmail.com
The integration aspect is not yet clear. In previous years, I knew that using the ammonia method for desulfurization could achieve a denitration efficiency of around 30%, but the current emission standards require more than that. In fact, whether it’s desulfurization or denitration, both processes rely on redox reactions; the stronger the reactivity, the better the results. No specific practical examples of integrated systems have been seen yet; and if such examples do exist, it is uncertain whether the by-products could cause secondary pollution. Many small power plants, especially those in water-scarce areas in the west, generate large amounts of desulfurization wastewater in order to meet the standards for flue gas emissions. It causes even greater secondary pollution. Pollution in the air can still be seen and dealt with, but groundwater pollution is not so easy to address
Reducing secondary pollution while removing contaminants is indeed an issue that deserves attention
We are now carrying out secondary treatment on the desulfurization wastewater before reusing it, which reduces pollution while increasing the efficiency of water utilization
Ozone or hydrogen peroxide is added to the tower to treat nitrogen oxides, and then the tower is washed! !
Fog technology enables the integration of desulfurization and denitration