Reduction of sulfur, nitrogen oxides and volatile trace metals from combustion in furnaces and boilers

A pollution reduction process, comprising substantially removing in a sequential series of processes, in a gas temperature range from about 3000° F. to about 200° F., a plurality of pollutants including nitrogen oxides, sulfur dioxide, dioxins, furans, volatile trace metals in ash, including at least one of arsenic, lead, and mercury, are removed wherein each of the sequential series of processes removes one or more of the pollutants individually and in combination further reduce the pollutants without impairing wall materials in furnaces and boilers wherein the pollutant reduction processes include two groups, wherein a first of the two groups comprises at least sulfur dioxide and takes place in a primary combustion zone, at about 3,000° F. gas temperatures, where fuel is injected and fired with combustion air, followed by a second of the two groups which take place in a post combustion zone between an exit of the combustion gases from the primary combustion gas zone at about 2,600° F. and a duct immediately upstream of a particle filter or electrostatic precipitator at gas temperatures of about 200° F.