Unit (11) for feeding a reducing solution from the tank to the exhaust duct of an endothemiic engine is provided. The unit comprises a supporting head (13) arranged for being associated to an aperture provided in a reducing solution tank and a heating device (15) for heating the reducing solution contained in the tank. The heating device (15) extends from the supporting head (13) and is provided with a duct (17) for a heating fluid. The duct (17) is defined by a side wall (31) which, when the unit (11) is in use, is internally in contact with the heating fluid passing through the duct (17) and externally in contact with the reducing solution present in the tank. At least one portion of the wall (31) of the duct (17) is non-smooth inside and/or outside the duct.

A chemical reactor including: a plurality of heat exchange plates which between them define reaction compartments, in which reactor each heat exchange plate includes two walls between them defining at least one heat exchange space, the respective walls being fixed together by joining regions, and the reactor also comprises at least one injection device for injecting substance into the reaction compartments, said substance-injection device passing through the heat-exchange plates in respective joining regions thereof. Also, a chemical reaction process that can be carried out in this reactor.

The present invention is directed to improved methods and systems for increasing the efficiency of a dehydrogenation section of an alkenyl aromatic hydrocarbon production facility, wherein an alkyl aromatic hydrocarbon, such as ethylbenzene, is dehydrogenated to produce an alkenyl aromatic hydrocarbon, such as styrene. The disclosed methods are more energy-efficient and cost effective than currently known methods for manufacturing styrene. The methods and systems advantageously utilize multiple reheat exchangers arranged in a series and/or parallel configuration that result in an energy consumption reduction and, consequently, a utility cost savings, as well as a reduction in styrene manufacturing plant investment costs.

The flow passage structure comprises: a plural number of ceramic flow passage layers laminated with one another, inside of which a flow passage is formed; two outermost layers disposed on respective sides of the plural number of flow passage layers in a lamination direction where the flow passage layers are laminated; an outer elastic sheets made of an elastic body, which is interposed between each of the outermost layers and the flow passage layer adjacent thereto; and a fastening member fastening the two outermost layers to each other, in a state that the two outermost layers sandwich the flow passage layers from both sides in the lamination direction.

The present disclosure relates to a shell-and-multi-double concentric-tube reactor and a shell-and-multi-double concentric-tube heat exchanger, and to a shell- and-multi-double concentric-tube reactor and a shell-and-multi-double concentric-tube heat exchanger which provide a new type of reactor and a heat exchanger, thereby maximizing catalyst performance and improving performance of the reactor by optimizing heat exchange efficiency and a heat flow, uniformly distributing a reactant, and increasing a flow rate of the reactant, and accordingly making the reactor and the heat exchanger compact.

Methods for improving heat transfer at the interface between the internal reactor wall and mesh media containing microfibrous entrapped catalysts (MFECs) and/or microfibrous entrapped sorbents (MFESs) are described herein. Improved (e.g., more rapid) heat transfer can be achieved using a variety of approaches including increasing the contacting area of the interface between the mesh media and the reactor wall so that more contacting points are formed, enhancing the contacting efficiency at the contacting points between the mesh media and the reactor wall, increasing the number of contact points between the mesh media and the reactor wall using fine fibers, and combinations thereof.

The main subject matter of the invention is a method for manufacturing at least one heat exchanger (50) with plates (10) with at least two fluid circuits, characterised in that it comprises the following steps: a) formation of a plurality of plates (10) each comprising a reference pattern; b) formation of one or more alignment patterns (11) on each plate (10) by circular repetition of the reference pattern around an axis of revolution (X); c) formation of a plurality of grooves (12) on each plate (10). The method further comprises the following successive steps: d) assembling the plates (10) by superimposition with respect to each other, each reference pattern of a plate being superimposed on an alignment pattern (11) of an adjacent plate; e) carrying out an assembly treatment on the assembly obtained at the end of the preceding step d) by diffusion welding, by brazing and/or by diffusion brazing.

A tube-bundle heat exchanger includes built-in elements formed by deflection surfaces, windows and directing sections. The product flows in the outer chamber of a tube-bundle heat exchanger with an inlet and an outlet for the product and an inlet and an outlet for the heat carrier medium in the tubes. The deflection panels including the tube-bundle heat exchanger are modified such that they leave windows open and a directing section is attached on the inlet side and the outlet side of the deflection surface. These directing sections run parallel to the tube axes and cross one another. The flow is divided by the direction sections on the inlet side and directed to the windows in opposing directions, where it then exits on respective opposing sides of the outlet sections and is deflected.

A radiator includes a base, a tubular structure, a plurality of fins and a spiral structure. The base has a water input port and a water output port. The tubular structure is coupled to the base and is further connected with the water input port and the water output port. A spiral structure is arranged inside the tubular structure, or the inner surface of the tubular structure has a delay structure formed by a plurality of bumps for improving heat dissipation efficiency of water. The tubular structure runs through the plurality of fins. In addition, the radiator of the present invention is applied to a hydrogen generator. The base of the radiator is directly and integrally formed with the upper cover of the water tank of the hydrogen generator, and the assembly can be completed only by coupling the base to the tube, thereby reducing the assembly process.

The invention concerns a heat exchanger having an exchange body having first passages for the flow of a first fluid and second passages for the flow of a second fluid exchanging heat with the first fluid, a first inlet manifold for introducing the first fluid into the first passages, a first outlet manifold for discharging the first fluid from the first passages). The heat exchanger also includes an inlet filter arranged facing the inlet surface of the exchange body, and/or an outlet filter arranged facing the outlet surface of the exchange body, the inlet filter and/or the outlet filter having a sheet metallic material selected from a metal gauze, a non-woven fabric of metallic fibres, a sintered metallic powder or sintered metallic fibres.