Topic
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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01 Jan 2023
TL;DR: In this article , models of cocurrent and countercurrent dryers were developed within a process flowsheeting package and applied to a case study of a timber veneer dryer to evaluate the balance between operating costs and the ease of control for different contacting arrangements.
Abstract: Models of cocurrent and countercurrent dryers have been developed within a process flowsheeting package (SPEEDUPTM) and applied to a case study of a timber veneer dryer to evaluate the balance between operating costs and the ease of control for these different contacting arrangements. For this case study, cocurrent working has been predicted to require only 2% more energy for the same final moisture content compared with countercurrent working. However, cocurrent working is significantly easier to control, according to several measures of process operability based on the steady-state response of the system.
TL;DR: In this paper , the local solids holdup and local particle velocity in a Countercurrent Liquid-upward and Solids-downward Fluidized Bed (CCLSFB) were investigated in details using optical fiber probes with two different models in a Plexiglas column of 1.5 m in height and 7.0 cm in inner diameter.
Patent•
04 May 2011
TL;DR: In this article, a diesel gas-liquid countercurrent hydrogenation method is described in which hydrogen and raw material diesel countercurrent pass through catalyst bed layers in a reactor, and the diameters of the reaction regions are successively increased from top to bottom in order to increase the section gaps (gas and liquid communication area) of the catalyst bed layer.
Abstract: The invention discloses a diesel gas-liquid countercurrent hydrogenation method which is characterized in that hydrogen and raw material diesel countercurrent pass through catalyst bed layers in a reactor, that is to say, the hydrogen enters the reactor from the bottom and is discharged from the top of the reactor, and a liquid phase enters into the reactor from the top to reversely contact the hydrogen and is discharged from the bottom of the reactor. a gas-liquid countercurrent reactor is provided with at least two reaction regions, and the diameters of the reaction regions are successively increased from top to bottom in order to increase the section gaps (gas and liquid communication area) of the catalyst bed layers in the reaction regions. Under the condition that the flow of the gas flowing upwards is increased with the height of the reactor, the gas speed is kept relatively stable to prevent the flooding of the reaction regions, thereby increasing the operational flexibility of the reactor.
Patent•
07 Aug 2019
TL;DR: In this paper, a method and a device for generating compressed nitrogen by the cryogenic decomposition of air is described, where the distillation column system has a high pressure column (4), a low-pressure column (6), a main condenser (5) and a low pressure column top condenser(7).
Abstract: The invention provides a method and a device for generating compressed nitrogen by the cryogenic decomposition of air. The distillation column system has a high-pressure column (4), a low-pressure column (6), a main condenser (5) and a low-pressure-column top condenser (7). The evaporation space of the low-pressure column top condenser (7) is in the form of a forced flow evaporator. The high-pressure column (4) has a baffle section (8) which is arranged directly above the point where the feed air (3) is introduced and has 1 to 5 theoretical or actual plates. The oxygen-rich liquid stream (11)introduced into the low-pressure column (6) is withdrawn from the high-pressure column (4) above the baffle section (8). Purge stream (9A) is withdrawn below the barrier zone (8) and removed (9B) fromthe distillation column system. The gaseous nitrogen stream (26A, 26B) is heated in a countercurrent subcooler (12) by indirect heat exchange with an oxygen-rich liquid stream (11) from the high pressure column (4) before being heated in the main heat exchanger (2).