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.

Floating head type single-tube-side countercurrent heat exchange method and heat exchanger

Abstract: The invention discloses a floating head type single-tube-side countercurrent heat exchange method, and belongs to the technical field of petrochemical engineering, energy conserving and process equipment. The method is used for solving the problems that the heat exchange depth of conventional heat exchangers is small and the deep energy conservation requirement cannot be met. According to the method, shell side media enter a shell from one end to exchange heat and then are discharged from the other end. The method is characterized in that tube side media enter the shell from the other end to exchange heat with the shell side media in a countercurrent mode and then are discharged through an inner guide tube with the thermal compensation function, and therefore high-temperature medium countercurrent heat exchange is realized and the deep energy conservation requirement is met; and inserts are arranged in heat exchange tubes to reinforce media heat transfer in the tubes, increase the heat transfer coefficient and improve the equipment efficiency. The invention further provides an auxiliary tube box, the inner guide tube and insert equipment for implementing the method. The method is used for realizing high-temperature medium countercurrent heat exchange, improving the heat exchange depth and realizing deep energy conservation.

Mass and Heat Transfer in Multi-Pulverizing RPB

Abstract: New typical cross-flow Rotating Packed Bed (RPB) called multi-pulverizing RPB was manufactured. Mass and heat transfer property of the new type PRB were studied by two experimental models. In the mass transfer model, the axial fan pumping gas press is only 100 Pa, mass transfer coefficient is similar to countercurrent RPB. In the heat transfer experiment, the axial fan pumping gas press is only 120 Pa; volumetric heat transfer coefficient is from 75 kW.m-3. K-1 to 100 kW.m-3. K-1.

Catalytic reactors and their modeling

Abstract: In an earlier review on modeling of catalytic gas–solid fluidized bed reactors, spouted beds were treated as a special case of fluidized beds, with the jet region extending to the upper free surface of the solids emulsion. The spout and the annulus are two well-distinguished zones, characterized by such different gas–solid contacting that they have been treated distinctly since the first approach for modeling spouted bed chemical reactors. The spout zone acts as a dilute vertical transport system, whereas the peripheral annulus has many similarities with a countercurrent downflow packed bed, the major peculiarity being gas percolation into the dense emulsion from the spout. Therefore, solids motion in a spouted bed is a major factor affecting mass and heat transfer, mixing, contacting, and hence the choice of reactor model. The solids can react (e.g., in combustion, where they are depleted over time), constitute inerts (e.g., sand diluting a solid fuel and regulating the system hydrodynamics, as well as providing a heat buffer), or act as a catalyst. Successful design and operation of a reactor depend on the ability to predict the system behavior, especially the hydrodynamics, mixing of individual phases, heat and mass transfer rates, and kinetics of the reactions involved.

Apparatus for treating high temperature waste water used in substrate processing apparatus

Abstract: An apparatus for treating high temperature waste water used in a substrate processing apparatus is provided to sufficiently lower temperature of the high temperature waste water by using a heat exchanger having a plurality of partition walls. A first pipe(110) discharges high temperature waste water used in a substrate processing apparatus. A heat exchanger(120) includes a heat exchange tank(122) that is connected to the first pipe and into which the high temperature waste water flows, and a plurality of partition walls(124) being arranged in the heat exchange tank and directing the high temperature waste water to flow in a zigzag form in the heat exchange tank in order to lower temperature of the high temperature waste water flowed through the first pipe. A second pipe(130) is connected to the heat exchanger to discharge the waste water of temperature being lowered in the heat exchanger. A check valve(132) is installed on the second pipe to prevent a countercurrent of the waste water.