Countercurrent exchange

About: Countercurrent exchange is a research topic. Over the lifetime, 2255 publications have been published within this topic receiving 28687 citations. The topic is also known as: Countercurrent exchange.

Gaseous heat exchanger of radial flow

Abstract: The utility model provides a gaseous heat exchanger of radial flow, gaseous heat exchanger of radial flow includes cylinder and heat exchange tube, the heat exchange tube set up in in the cylinder, which comprises an outer pipe and an inner pipe, part between the cylinder is the shell side, part in the heat exchange tube is the tube side, and the hot gas flows at the shell side, and cooling gas flows at the tube side The utility model provides a gaseous heat exchanger has changed cold and hot gas medium's flow pattern, and instant heating gas flows at the shell side, cooling gas flows at the tube side, carries out countercurrent flow, because cooling gas is narrow -minded, can reduce the tube bank quantity of heat exchange tube, the tube bank number that the while hot gas was flowed through at the shell side also reduces for the pressure drop of heat exchanger significantly reduces

Method of producing synthesis gas in heat exchanger reactor by conversion with steam

Abstract: FIELD: process engineering. ^ SUBSTANCE: invention relates to chemistry. Synthesis gas is produced from common charge containing hydrocarbons and, possibly, recirculated compounds. Common charge comprises first, second and third charges. Flow with first charge with addition of steam is subjected to conversion with steam to produce, at least, one synthesis gas fraction in, at least, one multi-tube heat exchange reactor with multiple tubes accommodating catalyst and chamber wherein said tubes are enclosed. First charge with steam addition circulates in multiple tubes in one direction. Reaction tubes are heated by circulation of fluid heat carrier outside said tubes, but, mostly, in first charge countercurrent conditions wherein fluid heat carrier contains, at least, first gas flow from partial or complete combustion of first charge subjected to circulation in aforesaid reactor for heating of reaction tubes, which then is mixed in, at least, one additional charge inside the chamber with, at least, a part of third charge and gas to up the temperature of said first flow. Mix flow thus produced circulates in heat exchange reactor for extra heating of reaction tubes till release from said reactor. Synthesis gas is produced from first load flow and, possibly, from part or all flow of fluid heat carrier. ^ EFFECT: higher process efficiency. ^ 14 cl, 6 dwg, 1 tbl, 1 ex

Apparatus for countercurrent heat exchange and its application to installations for the distillation of air

Abstract: This apparatus ( 3 A, 3 B) is for heat exchange between at least one first fluid available at a temperature at about ambient and at least one second fluid available at a cryogenic temperature below −20° C. It comprises structure alternately to circulate the first fluid through heat exchange material in an overall centripetal manner relative to a general central axis (X-X) of the apparatus ( 3 ), from a radially external inlet ( 17 ) of the apparatus, and structure to circulate the second fluid through the heat exchange material in an overall centrifugal manner relative to said central axis, from a radially internal inlet ( 18 ) of the apparatus. Use in cooling regenerators and exchangers, and if desired for simultaneous purification, of atmospheric air to be distilled.

Fractionation of 15n in countercurrent hno3-no system at low temperature

Abstract: This article describes the method for fractionation of 15N isotope based on the exchange of nitrogen isotopes in the system consisting of liquid mixtures of nitric acid and nitrogen oxides and the gaseous nitrogen oxide in the temperature range between 233 and 263 K under atmospheric pressure developed by the authors. The chemical interactions occurring between liquid nitric acid and gaseous nitrogen oxide at low temperatures and the equilibrium of the nitrogen isotopes exchange has been studied by means of the analysis of each co-existing phase in a packed column with counter-current movement of liquid and gas phases. The results obtained by theoretical modeling and experimental testing of the experimental plant have allowed one to conclude that the low temperature NITROX method is promising for the large-scale 15N production. This method improves upon the main technological parameters of the process as compared to traditional room temperature NITROX system. It allows for increasing the productivity of t...