The invention relates to a device approximately defining an L shape and comprising at least two first nested pipes in the foot of the L (32), and at least one second pipe (36) provided with at least one opening (38), in the leg of the L, the first pipes being arranged in such a way as to define a duct between one end (34) of a first central pipe and said at least one opening (38) by means of passages defined at the ends of the first pipes.

A chemical plant may include one or more fired heaters for heating of process streams. A fired heater may include a direct-fired heat exchanger that uses the hot gases of combustion to raise the temperature of a process fluid feed flowing through tubes positioned within the heater. Fired heaters may deliver feed at a predetermined temperature to the next stage of the reaction process or perform reactions such as thermal cracking. Systems and methods are disclosed to optimize the performance of fired heaters or reduce energy consumption of fired heaters.

A modular oven used as a pizza oven, a wood-burning stove, a barbecue PIT and an open fire. Equipment combining the functions of a wood-burning stove, a barbecue, a pizza oven and a space for an open fire in a single modular component, and allowing easy movement based on castors, is not known. The object of the present invention is to provide a modular oven formed by a vertical structure composed of modules that may be removed and installed, allowing the desired equipment to be constructed. A further object is to be able to provide the structure in the form of modular components made from refractory material, for example refractory concrete, which facilitates the construction thereof. A further object is to provide the base thereof as a heat source, with an opening designed to receive firewood and able to receive other modules or to act as an open fire.

A display generally comprising a container that contains a source of combustion and a heat exchange assembly positioned above the source of combustion is disclosed. The heat exchange assembly is heated by the source of combustion and air passing through the assembly is heated and directed to the surrounding area around the display.

A chemical plant may include one or more fired heaters for heating of process streams. A fired heater may include a direct-fired heat exchanger that uses the hot gases of combustion to raise the temperature of a process fluid feed flowing through tubes positioned within the heater. Fired heaters may deliver feed at a predetermined temperature to the next stage of the reaction process or perform reactions such as thermal cracking. Systems and methods are disclosed to optimize the performance of fired heaters or reduce energy consumption of fired heaters.