A contaminated gas stream can be passed through an in-line mixing device, positioned in a duct containing the contaminated gas stream, to form a turbulent contaminated gas stream. One or more of the following is true: (a) a width of the in-line mixing device is no more than about 75% of a width of the duct at the position of the in-line mixing device; (b) a height of the in-line mixing device is no more than about 75% of a height of the duct at the position of the in-line mixing device; and (c) a cross-sectional area of the mixing device normal to a direction of gas flow is no more than about 75% of a cross-sectional area of the duct at the position of the in-line mixing device. An additive can be introduced into the contaminated gas stream to cause the removal of the contaminant by a particulate control device.

A system and method for producing a modified coal ash involves collecting a bulk quantity of such coal ash, generally after it has been produced or landfilled, or is otherwise at temperatures closer to ambient, as opposed to power plant operational temperatures. In one possible implementation, the method herein involves removing carbon from the coal ash, such removal occurring by exposing the carbon to indirect heat, that is, externally-applied heat. For coal ashes with higher ash content. This removal is accomplished by subjecting the coal ash stream to heat, in one implementation, ranging between 850° F. and 1200° F., and such heat exposure occurring from about 10 minutes to about 30 minutes. The range of exposure time for the coal ash is determined so as to reduce the LOI from its initial level to a level acceptable for intended re-use or recycling. In one application, the LOI of carbon in the ash is reduced to 3% or less carbon. Upon completion of the range of the exposure time, the coal ash stream is removed from the sublimation heat, thereby forming a modified coal ash.

The present disclosure relates to a method for treating exhaust gas including a plasma reaction operation of reacting exhaust gas containing a volatile organic compound (VOC) with low-temperature plasma to generate exhaust gas containing a VOC-derived intermediate, and a combustion operation of combusting the exhaust gas containing the VOC-derived intermediate to produce carbon dioxide and water.

Disclosed is a compact venturi scrubber, used for removing undesirable materials from a gas stream, that includes a gas inlet section, a discharge section aligned with the gas inlet section, the discharge section having a base defined by the intersection of the gas inlet section and the discharge section, a diverging interior surface, and a diverging angle defined by the diverging interior surface, a nozzle, and a liquid inlet through which a liquid scrubbing medium is introduced to the nozzle, wherein the nozzle produces a full spray pattern directed towards the base of the discharge section with a sufficiently large discharge angle so that a cross-sectional area of the full spray pattern produced by the nozzle at the point it intersects with the base of the discharge section fully covers, and substantially matches the size and shape of, the cross-sectional area of the base of the discharge section.

The present invention relates to a hollow filter candle (1) which has, via impregnation of the inside with a catalyst solution, a concentration gradient of catalyst metals from the inside to the outside across the wall thickness thereof. The present invention furthermore relates to a method for producing a filter candle (1) according to the invention and the use of the filter candle (1) according to the invention for exhaust gas cleaning, in particular in waste incineration plants.

The present invention relates to a process for removing acid compounds contained in a gaseous effluent which consists in bringing a gaseous effluent into contact, in the absorption column, with an absorbent solution comprising water, between 20% and 28% by weight of pentamethyldipropylenetriamine and between 5% and 35% by weight of N-methyldiethanolamine.

The present disclosure relates to methods for processing plastic waste pyrolysis gas, such as methods wherein clogging of the systems used in the method is avoided or at least alleviated.

The invention concerns a plant and a method for treating gas by chemical, physical or hybrid absorption of compounds for removal, comprising at least: a) a step of absorption by contacting a gas for treatment with a depleted solvent to give a treated gas and a rich solvent; b) a step of optional separation by medium-pressure flashing c) a step of heat exchange between a fraction of the cold rich solvent and the hot depleted solvent in a first heat exchanger d) a step of heat exchange between the complementary fraction of the cold rich solvent and a hot gaseous effluent in a second exchanger e) a step of optional separation by low-pressure flashing f) a step of regeneration of the rich solvent by heating in a reboiler g) a step of separation by low-pressure flashing h) a cooling of the depleted solvent.

The invention relates to a method of reducing carbon dioxide and metal-containing dust and, more particularly, to a method of simultaneously reducing carbon dioxide and metal-containing dust by passing an off-gas, which contains carbon dioxide or carbon dioxide and metal-containing dust, through a reactor in which a sulfur-oxidizing microorganism is grown using carbon dioxide as a carbon source to produce sulfuric acid, and producing metal sulfates (MeSO.sub.4) by reaction of the produced sulfur acid with metal components present in the off-gas.

According to one embodiment, a gas processing equipment includes an oxygen remover 2 that removes oxygen contained in exhaust gas G, and a gas processing device 3 that processes pretreated exhaust gas G (P), from which the oxygen has been removed by the oxygen remover 2, with a carbon dioxide absorbent solvent S as a treatment agent.