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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.


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Patent
19 Mar 1986
TL;DR: In this article, the gas released upon cocurrent depressurization from higher adsorption pressure is employed simultaneously for pressure equalization and purging purposes for air separation and other gas separations employing pressure swing adaption technology.
Abstract: In air separation and other gas separations employing pressure swing adsorption technology, reduced cycle times are achieved by an advantageous combination of simultaneous processing steps. The gas released upon cocurrent depressurization from higher adsorption pressure is employed simultaneously for pressure equalization and provide purge purposes. Cocurrent depressurization is also carried out at an intermediate pressure level, while countercurrent depressurization is simultaneously carried out at the opposite end of the bed being depressurized to its lower desorption pressure level.

3 citations

Patent
18 Dec 2018
TL;DR: In this article, a method for measuring energy efficiency of a natural ventilation countercurrent wet cooling tower was proposed, which comprises the following steps: obtaining structural parameters of the thenatural ventilation counter-current liquid cooling tower, measuring operating parameters during an operation process, and measuring circulating water pump operating parameters, and calculating an energy efficiency evaluation index Eta of the naturalventilation countercurrent WET cooling tower.
Abstract: The invention discloses a method for measuring energy efficiency of a natural ventilation countercurrent wet cooling tower, which comprises the following steps: obtaining structural parameters of thenatural ventilation countercurrent wet cooling tower; measuring operating parameters during an operation process of the natural ventilation countercurrent wet cooling tower, and measuring circulatingwater pump operating parameters during the operation process of the natural ventilation countercurrent wet cooling tower, wherein the circulating water pump operating parameters comprise circulating water pump working voltage U and working current I, and obtaining consumed pump power W (pump power) of the matching circulating water pump of the natural ventilation countercurrent wet cooling tower based on the consumed pump power of the matching circulating water pump of the natural ventilation countercurrent wet cooling tower; calculating an energy efficiency evaluation index Eta of the naturalventilation countercurrent wet cooling tower; when the energy efficiency evaluation index Eta is smaller than a, determining that the energy efficiency of the natural ventilation countercurrent wet cooling tower is evaluated as low energy efficiency; when the energy efficiency evaluation index Eta is not smaller than a and smaller than b, determining that the energy efficiency of the natural ventilation countercurrent wet cooling tower is evaluated as intermediate energy efficiency; when the energy efficiency evaluation index Eta is not smaller than b, determining that the energy efficiency of the natural ventilation countercurrent wet cooling tower is evaluated as high energy efficiency.

3 citations

Journal ArticleDOI
TL;DR: In this article, the role of high conductive layer integration in the performance of the direct contact membrane distillation (DCMD) processes is investigated in particular temperature polarization coefficient (TCP), mass flux and thermal efficiency.

3 citations

Patent
20 Jun 2012
TL;DR: In this article, a method for purifying reverse osmosis concentrated water with an active carbon-membrane separation accumulation countercurrent absorption technology is presented, where active carbon (PAC) is added to the column of drain water produced in the running process of a reverse osification device, and adding into a membrane reactor for undergoing an adsorption reaction.
Abstract: The invention discloses a method for purifying reverse osmosis concentrated water with an active carbon-membrane separation accumulation countercurrent absorption technology. The method comprises the following steps of: extracting concentrated drain water produced in the running process of a reverse osmosis device, and adding into a membrane reactor for undergoing an adsorption reaction; dissolving powder active carbon (PAC) into the membrane reactor for continually adsorbing, wherein the adding amount of the PAC is determined according to the content of organic matters in the reverse osmosis concentrated water, and the adding amount of the PAC can be added appropriately if a treatment effect is poor; and performing aerated stirring and circulating reflux, adsorbing for 10-15 minutes, uniformly dispersing the PAC, fully mixing with reverse osmosis concentrated water, and discharging purified water with a hollow fiber membrane assembly. PAC accumulation countercurrent absorption and membrane separation are used together, so that cost is low, operation is easy and convenient, and automatic degree is high. Due to the adoption of the method for purifying reverse osmosis concentrated water, the requirements of the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant are met, and the potential hazard of direct discharge on a water environment is reduced; and the method plays an important role in maintaining the balance of a water ecological system.

3 citations

Journal ArticleDOI
TL;DR: In this article, the droplet entrainment mechanism in liquid nitrogen and VN2-VN2 countercurrent flow was investigated using the Eulerian-Eulerian mathematical framework in ANSYS Fluent®.

3 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202358
2022115
202127
202041
201947
201849