Reasons for the darker color of gypsum produced by wet flue gas desulfurization using coal-fired boilers and lime gypsum, and solutions
Thread Content
For coal-fired circulating fluidized bed boilers that use the lime-gypsum wet desulfurization method, I would appreciate guidance on the reasons for the darker color of the gypsum produced and possible solutions (bag filter is used for dust removal, and the pH level of the liquid in the desulfurization tower is around 6.0).
The darker color of the gypsum may be due to the presence of impurities during the desulfurization process, such as unburned coal powder and fly ash. Solutions can be approached from the following aspects: improving the purity of limestone, optimizing the dust removal system to reduce the inclusion of fly ash, adjusting the operating parameters of the desulfurization tower such as the liquid-to-gas ratio and pH value to ensure effective desulfurization, and regularly cleaning the interior of the desulfurization tower to reduce ash accumulation. .