Chemical formulation and combined process for inhibiting deposition and corrosion in cooling water and gypsum scaling in flue gas desulfurization scrubber systems

A combined cooling water/flue gas desulfurization process comprising:

• (a) contacting a gas with water in a cooling tower said gas having a lower temperature than said water such that upon contact said water is cooled by the transfer of thermal energy from said water to said gas, said water comprising between about 0.2 and about 100 ppm active by weight of an inhibitor formulation comprising polyacrylate, polymaleic anhydride, and phosphonate;
• (b) contacting a sulfur-containing gas with reagent slurry in a flue gas desulfurizer thereby desulfurizing said sulfur containing gas;
• and
• (c) supplying at least a portion of said water from said cooling tower to make up at least a portion of wash water in said desulfurizer, said water being supplied in an amount sufficient to maintain between about 0.01 and about 20 ppm active by weight of said inhibitor formulation in said reagent wash water.