A method and apparatus for achieving optimal combustion. A boiler has a blower-type burner operatively associated therewith wherein the burner has a variable speed blower. Combustive air is provided to the burner, and in accordance with the invention, a gaseous combustion-correcting complex is provided for supplying a plurality of gaseous additives to the combustive air of the burner. A plurality of sensors are disposed within the boiler and burner, and within a discharge outlet of the boiler, a...

A pressurized internal circulating fluidized-bed boiler is incorporated in a combined-cycle electric generating system in which a fuel such as coal, petro coke or the like is combusted in a pressurized fluidized bed and an exhaust gas produced by the combusted fuel is introduced into a gas turbine. The pressurized internal circulating fluidized-bed boiler includes a pressure vessel, a combustor disposed in the pressure vessel and a main fluidized bed combustion chamber provided with an air diffu...

A coal-fired firetube boiler and a method for converting a gas-fired firetube boiler to a coal-fired firetube boiler, the converted boiler including a plurality of combustion zones within the firetube and controlled stoichiometry within the combustion zones.

This abstract describes a process for the complete oxidation of municipal refuse and certain hazardous materials. The facility to accommodate the process consists of a completely enclosed, rotating, cylindrical kiln wherein solids, liquids, and gaseous compounds are simultaneously oxidized. To supplement the burning process, natural gas will be injected into the kiln chamber through a regulatory apparatus. Within the oxidation chamber, temperatures of 3200 degrees F., plus, will be maintained by...

Apparatus for cooperation with an associated furnace having the capability of burning either coal or oil wherein the improvement includes a coutant having an opening in the bottom thereof. An extended ash hopper is disposed under the coutant. The hopper includes a portion that extends beyond the coutant and a furnace sidewall that abuts an end of the coutant. The ash hopper is generally registered with respect to the opening and the apparatus includes apparatus for conducting gases to be recircu...

An apparatus and method by which deposits are removed from the heat exchange surfaces of heat exchange element in a boiler. According to the present invention, a heat exchange medium flowing through the element at a first temperature has injected into it a fluid at a second temperature. The injection of the fluid and the temperature difference between the fluid and the medium causes a pressure wave to be produced in the heat exchange element at a specific location whereby the pressure wave in th...

A stand supports a blast pipe generally upright with its open bottom end engaging against a stump. Fuel is inserted into the pipe and ignited. A blower injects air into the pipe to intensify the combustion of the fuel and promote burning of the stump adjacent to the bottom end of the pipe. The pipe is advanced into the stump as the stump is burned.

A method for endothermically dissociating contaminated acid wherein high velocity oxidant causes a recirculation flow within a combustion zone and combusts with fuel to release heat and wherein the heat is efficiently applied by the internal recirculation to the acid for endothermic dissociation of the acid.

The sulfur trioxide in the combustion gas stream of a power plant is reacted with injected ammonia to produce a solid ammonium sulfate that is captured, and not released to the atmosphere. A feedforward signal indicative of the total mass flow of sulfur trioxide is determined as the product of the measured boiler load and the sulfur trioxide content of the combustion gas, as measured prior to the addition of ammonia. The ammonia mass flow injection rate is preferably at a normal stoichiometric r...

A fluidized-bed incineration system is disclosed wherein complete combustion of fluctuating furnace charge is achieved through the use of an invented system that includes a feedback control apparatus to regulate the variable quantities of air required for treating fluctuating volumes of products of combustion processes; the combustion control is triggered by a feedback apparatus incorporating the computed measurements of radiative energy or furnace pressure in combination with dynamic oxygen mea...