Problems with ASPEN ammonia-based desulfurization

Thread Content

When using ASPEN to simulate ammonia-based desulfurization, the following message appears; I’m not sure what it means Reinitialization completed at 21:23:01 on Thu, Aug 17, 2017 >> -> Processing input specifications... INFORMATION: Since Henry components are defined in this case, the binary database will be searched automatically for any available Henry constants. The pair parameters for the ELECNRTL option set have been retrieved from the ENRTL-RK database. Parameters related to pure components have also been obtained from the database; these parameters are used with the ELECNRTL option set unless you enter your own parameters in the PROP-DATA sections. Parameter DGFORM was retrieved for component H2SO4; parameter DHFORM was also retrieved for H2SO4; parameter MW was retrieved for H2SO4; parameter PC was retrieved for H2SO4; parameter TC was retrieved for H2SO4; parameter ZC was retrieved for H2SO4; parameter RKTZRA was retrieved for H2SO4; parameter VC was retrieved for H2SO4; parameter VLBROC was retrieved for component NH3; parameter CPAQ0 was retrieved for component HSO4-; parameter CPDIEC was retrieved for component HCL; parameter VLBROC was again retrieved for component CO2; parameter THRSWT(ELEMENT/3) was retrieved for component HCL; parameter CPAQ0 was retrieved once more for component SO4--; parameter PLXANT was retrieved for component H2O; parameter THRSWT(ELEMENT/3) was retrieved for H2SO4; parameter PLXANT was retrieved for component HCL; parameter PLXANT was also retrieved for H2SO4; parameter THRSWT(ELEMENT/3) was retrieved for H2O. ** Error encountered while checking input specifications: Block name: A1; Model name: RSTOIC. Reaction number “1” does not satisfy the mass balance condition. The absolute error is -98.079. Please check the stoichiometry and molecular weights. ! Errors occurred while processing input specifications