Multi-flow evaporative condenser

Abstract

The invention discloses a multi-flow evaporative condenser, and belongs to the technical field of condensing equipment. A wet air outlet is added according to the increase of air humidity, so that nearly-saturated wet air can be directly blown away by a fan while rising in a shell; the resistance encountered during upward flowing of the wet air can be reduced compared with the original way that the wet air continually rises across a heat exchange tube bundle; and the pump power consumption of the fan is reduced. In addition, more dry air can be enabled to enter the shell in order to improve the mass and heat transfer efficiency between the air and cooling water. In the condenser, a horizontal tube bundle is adopted instead of a traditional coil in order to realize arrangement of the tube spacing according to the principle of optimal thicknesses of liquid films outside tubes, ensure the formation of thin and uniform liquid films outside the tubes, improve the evaporative heat transfer rate, avoid the occurrence of scaling, and improve the compactness of a heat exchanger so as to reduce the size of equipment. In the multi-flow evaporative condenser, multiple flows are adopted insteadof the traditional single flow, so that timely separation of condensate in the tubes is facilitated so as to strengthen condensation heat transfer in the tubes.

Description

technical field [0001] The invention relates to a multi-flow evaporative condenser, which belongs to the technical field of condensation equipment. [0002] technical background [0003] The evaporative condenser is a high-efficiency condensation heat exchange device that uses water evaporation to absorb latent heat and then cool the medium. Compared with the traditional water-cooled condenser, the evaporative condenser is equivalent to integrating the condenser and the cooling tower, which saves the power consumption of the circulating water pump and reduces equipment investment; the vaporized phase change heat transfer of water replaces the sensible heat transfer of water heat, reducing water loss; using the wet bulb temperature of the air to reduce the condensation temperature of circulating water and improve heat transfer efficiency. Therefore, the evaporative condenser with the characteristics of water saving, energy saving and investment saving is gradually used in pow...

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Problems solved by technology

[0004] The Chinese patents of CN108562071A, CN108253667A and CN1967096A disclose a coil evaporative condenser. In order to reduce the formation of dry wall and scaling on the surface of the heat exchange tube, the structure and process of the coil evaporative condenser are optimized, but the Due to the limitation of the layout of the coil, there are the following problems: limited by the radius of the elbow and the arrangement of the tube bundle, the tube spacing is too large, and "flying water" and dry wall are prone to occur, resulting in scaling on the outer wall of the tube; the tube bundle layout is not compact , the heat transfer area per unit volume is too small; due to the large pipe length and many elbows of the coil, the flow resistance of the fluid in the pipe is relatively large, and the heat transfer efficiency is low, especially for the condensation phase change process in the pipe, because the vapor and liquid in the pipe cannot Timely separation, condensate continues to accumulate, and the condensation heat transfer process in the tube deteriorates sharply; when the coil leaks due to corrosion, the entire heat exchange elbow needs to be replaced, and the maintenance cost is high

[0008] (2) Limited by the radius of the bend and the arrangement of the tube bundles in the coil structure, the tube bundles are too large to arrange the tube bundles according to the optimal thickness of the liquid film on the surface of the tube bundles. This requires increasing the cooling of the spray outside the tubes The water flow rate is used to prevent the liquid splash on the outer wall of the tube and the occurrence of dry wall. The increase of the thickness of the liquid film outside the tube causes the heat transfer rate to decrease and the power consumption of the circulating cooling water pump to increase;

[0009] (3) The length of the tubes and the number of elbows in the coil result in large liquid flow resistance in the tubes and a decrease in the heat transfer efficiency of the condensation phase change process in the tubes; the arrangement of the tube bundles is not compact, and the volume of the tube bundles is too large; the replacement and maintenance costs of the tube bundles are too high

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