A falling film air cooler and wastewater treatment process based on evaporative air cooling technology

Abstract

The invention discloses a falling-film type air cooler based on evaporative air-cooling technology, wherein several falling-film plates are arranged vertically and longitudinally; The filter plate on the falling film plate is provided with a number of square perforations penetrating the left and right sides of the filter plate. Each deflector is in the shape of an isosceles triangle, and the bottom edge of each deflector is in contact with the liquid-passing plate. , each deflector has a cavity inside, and each deflector has an opening on the bottom edge facing the liquid-passing plate, the liquid-passing plate is inserted into the deflector, and the bottom edge of each deflector is Corresponding top ends are provided with circular perforations; connecting pipes are arranged between the circular perforations of every two falling film plates; The invention has the advantages of good heat transfer and mass transfer synchronization, no mass transfer downward phenomenon, extremely high heat transfer coefficient, small heat transfer temperature difference loss, and can be assembled on site.

Description

technical field [0001] The invention relates to the field of high-salt wastewater treatment, in particular to a falling film air cooler based on evaporative air cooling technology and a wastewater treatment process. Background technique [0002] For most factories, the soluble salt discharged from the factory mainly comes from the use of fresh water in the factory. The specific ways to generate high-salt wastewater are: purified wastewater generated during the factory water purification process, such as the blowdown of the boiler desalination system, the boiler , sewage discharge of continuous drainage system; sewage discharge formed by circulating cool water system to maintain the stability of water quality. The soluble salt indicators of the high brine from the above two paths are basically similar, and this similarity is reflected in the water quality composition and concentration ratio, and the volume is also the same. For factories of different production types, the co...

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Problems solved by technology

[0004] However, there are the following problems in the treatment of high-salt wastewater: 1. Technical problems. The problem that cannot be solved in the treatment of high-salt wastewater is salt separation, that is, the solid-state separation of salt

The current problems of membrane separation (HERO) and electrodialysis (EDR) technologies are: the selective permeability of the membrane is not high; the cost is high, the life is short; the power consumption is high, and the energy usage level is high.

When the water spray density is too small, the heat transfer efficiency is high, but it is easy to cause the tube wall to be stagnant; when it is too large, it is easy to cause a decrease in heat transfer efficiency

When the shell-side water circulation of the surface evaporative air cooler adopts high brine, the concentration effect can be produced, and the resulting technical problem is: in the high brine environment, the heat exchange tube of the surface evaporative air cooler should not use carbon steel, but needs Upgraded to stainless steel series materials, the equipment investment increased by orders of magnitude, the shell structure of the surface evaporative air cooler is restricted by the manufacturing and transportation conditions, and the processing capacity of a single equipment is too small, which is not suitable for large chemical enterprises.

The heat transfer temperature difference loss is large, and the heat transfer temperature difference loss is closely related to the circulation flow rate of high brine. When the circulation rate is controlled by a high cycle ratio, the heat transfer efficiency of the system is improved and the temperature difference loss is reduced. This is beneficial to the circulating cold water end. Favorable, but the mass transfer efficiency on the tower side decreases, and the power cost required for water circulation increases; and when the circulation rate of high brine is low, the mass transfer efficiency on the tower side increases, but the heat transfer efficiency decreases, and the temperature loss of the system increases large, causing the temperature of the circulating cooling water system to be too high, which has an unacceptable impact on the process system of the whole plant

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