A method and assembly for supplying heat in the desired pattern while suppressing the production of nitrogen oxides and carbon dioxide. The assembly includes a fluid mixture nozzle assembly in fluid communication with an external conduit and a radiant section of a fired process heater. The fluid mixture nozzle assembly includes an open mixing channel having an upstream converging section, a midstream mixing section, and a downstream diverging section for entraining a fluid mixture with vitiated flue gas combustion products. The fluid mixture nozzle assembly is installed in the wall, floor, or ceiling of the fired heater.

Disclosed herein is a flue pipe system comprising a flue pipe, a first electrode, a second electrode, a third electrode, and a voltage supply. The flue pipe can define a fluid flow path through an interior volume of the flue pipe. The voltage supply can be connected to the first electrode, the second electrode, and the third electrode. The voltage supply can form a first electrical circuit comprising the voltage supply, the first electrode, and the third electrode and a second electrical circuit comprising the voltage supply, the second electrode, and the third electrode. The first electrical circuit can form a streamer corona discharge between the first electrode and the third electrode in the interior volume such that the fluid flow path flows therethrough. The second electrical circuit can form a flow of ions between the second electrode and the third electrode along the interior surface of the flue pipe.

A method for the control of nitrogen oxides content in the combustion fumes of a thermal power plant is disclosed; the method comprises the on-site production of ammonia by the steps of: electrolysis of water as a source of hydrogen; separation of air as a source of nitrogen, formation of a make-up gas and synthesis of ammonia in a suitable synthesis loop; said on-site produced ammonia, or a solution thereof, is used for a process of reduction of nitrogen oxides in the combustion fumes.

A lean burn combustion source includes a first side stream comprising an inlet and an outlet, both positioned downstream of a furnace and upstream of a particulate control device, and a second side stream comprising: an inlet positioned downstream of the particulate control device and upstream of the catalyst, a heat exchanger section passing through the first side stream, whereby heat from hot exhaust gas flowing through the first side stream is transferred to hot exhaust gas flowing through the second side stream, an injector positioned in the second side stream injecting aqueous based reagent into the hot exhaust gas flowing through the second side stream such that the aqueous based reagent decomposes to ammonia gas, and an outlet in fluid communication with a reagent distribution device positioned in the primary exhaust gas stream downstream of the particulate control device and upstream of the catalyst.

A process for capturing undesirable combustion products produced in a high temperature combustion system in which a carbonaceous fuel is utilized. Very finely sized particles of alkaline earth carbonates or hydroxides, with or without added ground ash, are provided in slurry form, are dried and milled to provide unagglomerated, sub-micron-sized particles that are injected along with pulverized coal and an oxidizing agent into the high temperature combustion zone of a furnace. The particles capture and neutralize the gases that result in condensable acids, including SO.sub.x, NO.sub.x, HCL, and HF, as well as capturing toxic metals that are present in the combustion products, they mitigate ash fouling and slagging, and they facilitate economic heat exchange that permits fuel savings and recovery of water for use in other processes.

A gas includes a main pipe, a bypass pipe, a gas sensor and a cooler. The main pipe, as an exhaust pipe, discharges exhaust gas generated at combustion of gas fuel. The bypass pipe branches from the main pipe and is set to be smaller in flow rate of the exhaust gas than the main pipe. The gas sensor is arranged in the bypass pipe to detect a gas contained in the exhaust gas. The cooler cools the bypass pipe.

The present invention provides environmental equipment which is able to remarkably reduce operating costs and a power generation system comprising same, comprising: a boiler; a power generation unit for generating electricity by steam generated from the boiler; first denitrifying equipment to which exhaust gas is delivered from the boiler and which sprays a reducing agent into the exhaust gas to denitrify the exhaust gas; a low-low temperature electrostatic precipitator for collecting dust of the exhaust gas provided from the first denitrifying equipment; second denitrifying equipment which sprays a reducing agent into the exhaust gas provided from the low-low temperature electrostatic precipitator to secondarily denitrify the exhaust gas and allows the exhaust gas to be provided towards a smokestack.

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 gas combustion treatment device that subjects an ammonia-containing gas, a hydrogen cyanide-containing gas, and a hydrogen sulfide-containing gas to combustion treatment includes: a first combustion unit configured to introduce therein fuel, the ammonia-containing gas, the hydrogen cyanide-containing gas, and air and burn and reduce the fuel and the gases at an air ratio lower than 1; a second combustion unit provided downstream of the first combustion unit and configured to burn and reduce, in a reducing atmosphere, nitrogen oxide in a first combustion gas sent from the first combustion unit; and a third combustion unit provided downstream of the second combustion unit and configured to introduce therein hydrogen sulfide-containing gas with air in addition to a second combustion gas sent from the second combustion unit.

A method comprising treating combustion exhaust gas containing nitrogen oxides in the presence of a denitration catalyst to remove nitrogen oxides from the combustion exhaust gas, wherein the denitration catalyst is composed of a shaped product comprising a catalyst component, the shaped product has micro cracks in a mesh pattern or a bipectinate pattern on the surface of the shaped product, and the micro cracks have a 95% crack width of 100 μm or less and a crack area ratio variation coefficient of 0.7 or less.