Abstract: A low NOx gas combustor includes an air injection mechanism to create a combustion air path. A set of arc-shaped gas injector arrays are formed in an annular configuration. Each arc-shaped gas injector array injects an arc-shaped stream of gas that intersects with the combustion air path to produce a fuel rich flame segment that is separated from an adjacent fuel rich flame segment from an adjacent arc-shaped gas injector array by an air rich zone. The interaction between the fuel rich flame segment and the air rich zone results in low NOx combustion of the gas.

Abstract: A method is provided for reducing the sulfur content of exhaust (flue) gas from a combustion installation manufacturing process, or chemical process comprising the step of injecting dry powder alkali hydrate sorbent directly into intermediate temperature (800.degree.-1200.degree. F.) combustion/process gases. The alkali hydrate sorbent reacts rapidly with the sulfur-containing gases in this temperature regime to produce primarily alkali sulfites. The unreacted portion of the sorbent largely remains in the form of an alkali hydrate and may react further with residual sulfur, especially in the presence of water, at lower temperatures. A novel combustion chamber is also provided having an injection means for injecting alkali hydrate sorbent into a combustion volume where the temperature is in the range of 800.degree.-1200.degree. F., to cause a predetermined reaction of the alkali hydrate sorbent with SO.sub.