Abstract: In an embodiment, a system and methods for updating rules, deadlines, and procedures in a community exchange system are provided. Users of the system, which may be contributors who update and introduce new triggering events and their associated rule and best practices deadlines and/or subscribers who use the system to calculate deadlines using the most up-to-date rule and best practice deadlines provided by the system, communicate with a server using their personal devices through a network or network(s). Contributors may receive rewards which may be converted into credit for use of the system to calculate deadlines or used for other purposes.

Abstract: A system is provided for maintaining the concentration of sulfur oxides in a flue duct (60) at a predetermined value. The sulfur oxides being maintained at a concentration to substantially optimize the particulate removal performance of an electrostatic precipitator (70). The sulfur rate control system (100) injects sulfur trioxide into the flue gas in proportion to a deficiency in the content of sulfur oxides in the flue gas, with respect to the proportion to particulates being carried by the flue gas. The sulfur trioxide is formed in a catalytic converter (54) which is supplied with sulfur dioxide and oxygen from a reaction chamber (40). The formation of sulfur dioxide is controlled by metering the source of sulfur responsive to a signal provided from a ratio controller (64).