A downflow hearth furnace includes a refractory-lined furnace lid. A burner is thermally coupled through the lid. A combustible material conveyor system communicates with an entry port. A variable speed motor driven rotatable combustible material disperser is positioned under the entry port and coupled to a rotation shaft. A refractory-lined furnace shell has a top edge mating with a bottom edge of the furnace lid and can be raised and lowered between an open position and a closed position. A bed of gas-permeable heat resistant material suspended on a layer of filter material defines a bottom end of a hearth disposed above a plenum. An outlet duct communicates with the plenum and has a horizontal outlet flange. A fixed scrubber input duct has an inlet flange positioned to mate with and form a seal with the outlet duct flange when the furnace shell is in the closed position.

Methods and systems for inhibiting buildup of crystalline materials in a flue gas desulfurization (FGD) unit. Crystalline materials can accumulate in FGD units as a byproduct of chemical desulfurization processes and can adversely impact FGD unit function. The systems described in the present application include an FGD unit with one or more selected bacterial strains disposed therein. It is believed that the bacteria may form a biofilm on the surfaces in the FGD and/or form a biosurfactant to inhibit or prevent buildup of crystalline materials in the FGD unit. Methods include inoculating an FGD unit with one or more selected bacteria that inhibit or prevent buildup of crystalline materials in the FGD unit. Methods may include periodic reinoculation of the FGD unit.

The invention relates to a method for cleaning a gas, comprising the step of guiding said gas to be cleaned through a supply line and contacting said gas with a liquid and a step of injecting the liquid into the gas flow under pressure over a complete flow area of said supply line. The method is characterized in that the gas to be cleaned is fed into the gas cleaning compartment from a gas supply line, said gas cleaning compartment having a peripheral wall, and in that the gas cleaning compartment at a downstream position of the gas supply line is provided with at least one injection nozzle provided in the peripheral wall for injecting the liquid into the gas cleaning compartment and against an opposite wall part, said method further comprising the step of discharging the liquid and the contaminants contained therein via the wall of the gas cleaning compartment. The invention also relates to a device for performing the method.

A method for the treatment of gas generated by the combustion of fossil fuel in a first combustion chamber, the method comprising the steps of transferring the gas to a second combustion chamber, combusting the gas in the second furnace in the presence of oxygen and a fuel source to generate waste gas and treating the waste gas to produce a concentrated carbon dioxide stream.

Provided is an air pollution control system including: a boiler, a denitration apparatus; an air heater; a precipitator; a desulfurization apparatus; a dehydrator; a concentration apparatus that is configured to remove some of water of dehydrated filtrate from the dehydrator; a spray drying apparatus provided with a spray unit that is configured to spray concentrated/dehydrated filtrate concentrated by the concentration apparatus; and a flue gas introduction line through which branch gas branched from the flue gas is introduced to the spray drying apparatus.

The disclosure concerns a system for the removal of particulate from a waste vapor stream from a hydrocarbon production process. The particulate can be removed from the waste vapor stream using a series of water streams and gravity separation.

The present application provides an air quality control system for cleaning a flue gas from a fluid catalytic cracking unit. The air quality control system may include a selective catalytic reduction system in communication with the flue gas to remove nitrogen oxides and a wet scrubber positioned downstream of the selective catalytic reduction system and in communication with the flue gas to remove sulfur oxides and particulates.

Provided is an air pollution control system including: a boiler, a denitration apparatus; an air heater; a precipitator; a desulfurization apparatus; a dehydrator; a concentration apparatus that is configured to remove some of water of dehydrated filtrate from the dehydrator; a spray drying apparatus provided with a spray unit that is configured to spray concentrated/dehydrated filtrate concentrated by the concentration apparatus; and a flue gas introduction line through which branch gas branched from the flue gas is introduced to the spray drying apparatus.

Provided is an air pollution control system including: a boiler, a denitration apparatus; an air heater; a precipitator; a desulfurization apparatus; a dehydrator; a concentration apparatus that is configured to remove some of water of dehydrated filtrate from the dehydrator; a spray drying apparatus provided with a spray unit that is configured to spray concentrated/dehydrated filtrate concentrated by the concentration apparatus; and a flue gas introduction line through which branch gas branched from the flue gas is introduced to the spray drying apparatus.

Flue gas is a by-product of many energy and industrial plants and is typically emitted through a chimney stack. If the flue gas temperature in the chimney stack drops below the flue gas dew point, condensation of water vapor and acid gases ensues. These gases are very corrosive for chimney stacks designed to operate in a dry condition. The Flue Gas Reheat System of the present invention continuously and proactively manages flue gas chimney stack temperatures above the dew point in order to optimize emission control and effectuate energy efficiency improvements in industrial plants. Waste heat is harvested from the exterior surfaces of existing steam and pollution control equipment through conduction, convection and radiation. This heat is transferred to a working fluid. The working fluid is then directly mixed with the flue gas prior to the flue gas entering the chimney stack to raise the temperature of (or re-heat) the flue gas above its dew point to maintain a dry chimney stack condition. The use of residual or waste heat from throughout the plant and the minimal equipment required to harvest the waste heat reduces the operating cost and improves the overall reliability of the system. This method is useful in many industries, including electric power generation plants and other energy intensive process industries that seek emission control and various boiler and fuel energy efficiency improvements, many of which improvements result in a reduction in normal chimney stack temperature.