Multi-page rolled type film contactor for removing resolvable gases in water

Abstract

The invention provides a multi-page rolled type film contactor for removing resolvable gases in water; the film contactor consists of three parts including a tube shell, a film core and a shell cover; the film core is formed by a film bag rolled along a center pipe, wherein the film bag is formed by two layers of plate-type micro-porous membranes and a layer of partition net which are overlapped with each other; a spiral inner cavity and a spiral outer cavity are formed in the film bag and outer of the film bag, respectively. Water flows through the outer wall of the film, sweeping gas is pumped from the inner wall of the film by a vacuum pump, the vacuum generated by the high-flow sweeping gas and the vacuum pump enables the gas movement of CO2 (carbon dioxide) or O2 (oxygen) in the water from the inner part of the film to the film wall, and the inter-phase mass transfer and separation are achieved by the indirect contact of micro-porous membranes between channels. The multi-page rolled type film contactor can remove oxygen at a low temperature without heating water, and thus the energy consumption is low; the film contactor is compact in structural design, is small in volume, is convenient to mount and use, is easy to operate, is stable when running in equipment, is small in circulating volume and excellent in separation effect; the gas removing efficiency can reach more than 99%, and the concentration of CO2 in outlet water is less than 2ppm and the concentration of O2 is less than 2ppb.

Description

technical field [0001] The invention relates to a multi-sheet rolling membrane contactor for removing dissolved gases in water, especially O in water for steam boilers. 2 removal. Background technique [0002] In industrial production, the requirements for dissolved oxygen content in water are becoming more and more stringent. Food, biotechnology, semiconductors, and boiler water all need to remove dissolved oxygen, especially in the boiler industry. The presence of dissolved oxygen can easily cause boilers and water pipes to Corrosion of the road, and deposits on the surface of the boiler wall, causing the boiler to be heated unevenly and cause an explosion. According to incomplete statistics, various failures of the boiler are related to dissolved oxygen, accounting for more than 40%. Therefore, the control of the oxygen content in water for thermal recovery boilers plays a key role in ensuring the safe and economical operation of thermal recovery steam boilers. The rele...

AI Technical Summary

Problems solved by technology

Among them, the plate-type membrane contactor has a small packing density and low efficiency, and often requires multi-stage membrane contactors to be used in series and parallel. The operation of the equipment is complicated and the separation time is long; the hollow fiber-type membrane contactor has a high packing density, has a self-supporting effect, and is widely used. However, some membrane materials (such as polytetrafluoroethylene) are limited by the membrane manufacturing process, and it is difficult to obtain a hollow fiber membrane contactor, and the application is limited to a certain extent.

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