A method is described for operating a catalytic evaporator (1), with the step: feeding fuel and an oxidant to the catalytic evaporator, which method is distinguished by the fact that (a) the feed of the fuel is performed as a pulsed feed, and/or (b) the feed of the oxidant is performed as a pulsed feed.

A method is described for operating a catalytic evaporator (1), with the step: feeding fuel and an oxidant to the catalytic evaporator, which method is distinguished by the fact that (a) the feed of the fuel is performed as a pulsed feed, and/or (b) the feed of the oxidant is performed as a pulsed feed.

An internal combustion engine (1) has anelectric heating catalyst (5) in an exhaust passage (2) . When it is detected that a door has been opened, the electric heating catalyst (5) is preheated. If power of an engine controller (8) is lost during the preheating, information on an estimated temperature, which is stored in the engine controller (8), is lost. The engine controller (8) forbids energization of the electric heating catalyst (5) until a cooling period necessary for temperature of the electric heating catalyst (5) to fall elapses after recovery of the power of the engine controller (8) . After the cooling period elapses, the preheating is started again.

An internal combustion engine (1) has anelectric heating catalyst (5) in an exhaust passage (2) . When it is detected that a door has been opened, the electric heating catalyst (5) is preheated. If power of an engine controller (8) is lost during the preheating, information on an estimated temperature, which is stored in the engine controller (8), is lost. The engine controller (8) forbids energization of the electric heating catalyst (5) until a cooling period necessary for temperature of the electric heating catalyst (5) to fall elapses after recovery of the power of the engine controller (8) . After the cooling period elapses, the preheating is started again.

A system for reducing a temperature of an exhaust gas stream of a gas turbine system according to an embodiment includes: a compressor component of a gas turbine system; an airflow generation system for attachment to a rotatable shaft of the gas turbine system, the airflow generation system and the compressor component drawing in an excess flow of air through an air intake section; a mixing area for receiving an exhaust gas stream produced by the gas turbine system; an air extraction system for: extracting at least a portion of the excess flow of air generated by the airflow generation system and the compressor component to provide bypass air; and diverting the bypass air into the mixing area to reduce a temperature of the exhaust gas stream; and a fluid injection system for injecting an atomized fluid into the mixing area to reduce a temperature of the exhaust gas stream.

A system for reducing a temperature of an exhaust gas stream of a gas turbine system according to an embodiment includes: a compressor component of a gas turbine system; an airflow generation system for attachment to a rotatable shaft of the gas turbine system, the airflow generation system and the compressor component drawing in an excess flow of air through an air intake section; a mixing area for receiving an exhaust gas stream produced by the gas turbine system; an air extraction system for: extracting at least a portion of the excess flow of air generated by the airflow generation system and the compressor component to provide bypass air; and diverting the bypass air into the mixing area to reduce a temperature of the exhaust gas stream; and a fluid injection system for injecting an atomized fluid into the mixing area to reduce a temperature of the exhaust gas stream.

A muffler, in particular an end muffler, is provided for an exhaust system in a vehicle. The muffler has a muffler housing that has an exhaust intake pipe via which exhaust flows into the muffler housing as well as an exhaust discharge pipe via which exhaust flows out of the muffler housing. At least part of the muffler housing or the entire muffler housing is surrounded by an outer housing, and an air gap is provided between the muffler housing and the outer housing.

A muffler, in particular an end muffler, is provided for an exhaust system in a vehicle. The muffler has a muffler housing that has an exhaust intake pipe via which exhaust flows into the muffler housing as well as an exhaust discharge pipe via which exhaust flows out of the muffler housing. At least part of the muffler housing or the entire muffler housing is surrounded by an outer housing, and an air gap is provided between the muffler housing and the outer housing.

An airflow control system control system for a gas turbine system according to an embodiment includes: an airflow generation system including a plurality of air moving systems for selective attachment to a rotatable shaft of a gas turbine system, the airflow generation system drawing in an excess flow of air through an air intake section; and a mixing area for receiving an exhaust gas stream of the gas turbine system; the airflow generation system: directing a first portion and a second portion of the excess flow of air generated by the airflow generation system into the mixing area to reduce a temperature of the exhaust gas stream; and directing a third portion of the excess flow of air generated by the airflow generation system into a discharge chamber of a compressor component of the gas turbine system.

The present application provides a selective catalyst reduction system for use with a combustion gas stream of a gas turbine. The selective catalyst reduction system may include a tempering air system with a finger mixer and a number of mixer plates and a catalyst positioned downstream of the tempering air system. The tempering air system cools the combustion gas stream and evens out the temperature profile before the combustion gas stream reaches the catalyst.