Vacuum flash evaporation enhanced mass transfer deoxidation equipment and deoxidation process

Abstract

The invention relates to vacuum flash evaporation enhanced mass transfer deoxidation equipment and a deoxidation process. The process flow comprises the following steps of: feeding oxygen-containing water which is preheated to certain temperature into an enhanced mass transfer deoxidation machine by using a feed pump; spraying the water on an inner cylindrical wall of a revolving drum by using a spray pipe after feeding the water into the deoxidation machine from a feed port and feeding the water into a filler layer; reducing pressure to saturated steam pressure at the temperature under the action of the vacuum pump, wherein the water starts to boil and produces steam at the temperature; striking the water into a liquid membrane or droplets by the filler layer which rotates at a high speed in an enhanced deoxidation machine; repeatedly performing mass transfer on vapor phase and liquid phase in the process and throwing water and steam out of an outer cylindrical wall of the revolving drum; rapidly bringing away the steam produced by boiling and desorbed oxygen through an air outlet by the vacuum pump, wherein dissolved oxygen is continuously reduced by continuous production of vapor; and discharging the bottom deoxygenated water from a discharge pump through a liquid outlet. By combining vacuum flash evaporation, steam stripping and enhanced mass transfer, the process has the advantages of high deoxidation efficiency, low running cost, small size, energy conservation, environmental friendliness and broad application range.

Description

technical field [0001] The invention relates to a vacuum flash evaporation enhanced mass transfer deoxidation equipment and a water deoxygenation process using the equipment. Background technique [0002] Water is an important material resource in human production activities. Water is needed in many places in modern production. In many fields, there are high requirements for the oxygen content of water. For example, water injection in oil fields needs to reduce the oxygen content to 50 ~100mg / m 3 Below, the water for steam boilers needs to reduce the dissolved oxygen content in the water to 50mg / m 3 Below, even 7mg / m 3 The following is to reduce the corrosion of dissolved oxygen to equipment. In the food industry, it is also necessary to deoxidize beverages, beer, etc. to improve quality, extend shelf life and reduce the use of preservatives. [0003] In an open environment, the water body will dissolve the oxygen in the air. This dissolution balance follows Henry's law ...

AI Technical Summary

Problems solved by technology

[0005] The traditional steam deoxygenation device requires a bulky stripping tower (a supergravity machine can also be used), as described in the patent CN 201280447Y, which includes a connected desorption tower and an absorption tower, but both require a steam generating device and consume a large amount of energy. Steam, with low mass transfer efficiency and high temperature, is difficult to apply in the food and beverage industry

[0006] The traditional vacuum deoxidation device, as described in the patent CN 2060626U, adopts spray feeding, because the water vapor generated by passive evaporation is only generated on the water surface, and the amount of water vapor is small, the mass transfer efficiency is low, and the required vacuum degree is high. Cannot achieve high oxygen removal capacity

[0007] Traditional chemical deoxidizers (or combined with other deoxidizers) need to consume a large amount of deoxidizers, and will cause secondary pollution to water, making it difficult to apply in the food and beverage industry

[0008] Patent CN86101425 mentions a device that utilizes variable pressure cooling evaporation to generate steam for oxygen removal, but its application is still limited due to its high temperature, high pressure, and low mass transfer efficiency

[0009] In patent CN 1064338A, the high-gravity rotating bed is used to feed oxygen-free N 2 Or natural gas for deoxidation requires a large amount of gas, and oxygen-free gas is not easy to obtain, and it is difficult to achieve a very low oxygen content. When steam deoxidation is used, a steam generating device is also required, such as the document "Using Super Gravity Technology In "Deoxidation of Boiler Feed Water" (Progress in Chemical Industry, Volume 21, Issue 6, 2002), higher temperature is required, energy consumption is large, and application range is narrow

[0010] Therefore, the traditional deoxidation methods have certain application defects. Although some existing traditional deoxidation methods can meet the application requirements, they all have the problem of high cost and are difficult to popularize and apply.

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