Distillation Column

2015-01-20 13:46:02 点击数：

Advantages: Under certain conditions, the packed column pressure drop is small, high operating flexibility, production capacity, highlighting the advantages of a small amount of liquid hold, but the higher cost of some filler, and sensitive to the initial distribution, the separation at high pressure efficiency and throughput generally higher than in regular, reduced pressure was much lower;

Relatively speaking, the plate tower structure is simple, easy to enlarge, and low cost, as well as physical system for atmospheric pressure, especially City tower diameter and multi-lateral line gas-liquid mass transfer equipment, plate towers have a greater advantage in the operation and design already has a more mature experience. Therefore, the development of research on the plate tower tower technology still plays an indispensable role. Different types of plate tower, which lies in the different structures of the plate, a common main types are: bubble column, sieve tray, floating valve tower, tongue tower. Board bubble column is the first industrial application of a plate column, but in quite a long period of time is more popular plate tower a tower. Compare plate tower is a very complex issue. But production capacity, tray efficiency, operational flexibility, the pressure drop and the cost and other terms, the float valve in the steam load tower, operating flexibility, efficiency and bubble column trays have a clear advantage compared to the current thus obtained widely used. Drop sieve tray is small, low cost, large capacity, in addition to a smaller operating flexibility, the rest are close to the float valve tower, it has a wider application.

Packed tower belonging differential contact type liquid mass transfer equipment. Tower packing for the basic components in the gas-liquid contact and mass transfer. Liquid filler surface was membranous flow from top to bottom, bottom to top with the gas phase in a continuous countercurrent flow of liquid to do, and gas-liquid mass transfer between the two phases and heat transfer. Two-phase concentration or temperature changes along a continuous high tower. There are major components of the tower, fillers and support, liquid distributors and redistributors, demister and so on. Packing is the core internals packed tower, it is the gas - liquid two-phase heat transfer and mass transfer sufficient contact surface area is provided. Bulk fillers and can be divided into two major categories of structured packing. Bulk packing refers to the huddle based filler, the filler particle having a certain shape, also known as particulate filler; in huddle bulk packed column gas-liquid two-phase flow path is random, when combined with fillers to fill difficult to achieve uniform consistent throughout, and thus prone to channeling and other adverse conditions, thereby reducing the efficiency of the tower. Structured packing is a uniform geometry in the tower by the rules, neat pile of packing voids large, so large capacity, low pressure drop, and because of the flow channel rules, so long as the initial liquid evenly distributed in the whole tower distribution is uniform, so the structured packing is almost no amplification effect, with high mass transfer efficiency. Types of structured packing structure can be divided in accordance with gauze packing and packing board, depending on size of the packed column, folded into a cylindrical block or block the use of the tower in the tower makes up a cylindrical puzzle loading.