Energy-saving heat exchange system with direct vapor-water mixing

Abstract

The invention discloses an energy-saving heat exchange system with direct vapor-water mixing, namely, a spray atomization heat exchange water collection device is arranged in the high temperature end in the laryngeal portion of a condenser so as to perform high-low temperature condensed water shunting and further to achieve heat exchange cooling circulation and heating circulation of condensed water. The energy-saving heat exchange system is characterized in that cross-cooling circulation and heating circulation are utilized to solve the conflict between the vacuum degree of the unit and the too low temperature of the condensed water. Low-temperature condensed water vapor is directly mixed for heat exchange and cooling circulation to improve the vacuum degree. Condensed water heating circulation is utilized, which avoids the problem that the condensed water becomes too cold, so that backheating economy is improved. Water-water heat exchange and low-temperature water storage are used to improve the vacuum degree of the unit. Furthermore, a water collection device is used for separating the vapor discharging whirlpool at the laryngeal portion to improve the flowing effect. The energy-saving heat exchange system is remarkable in energy-saving effect and easy to implemente and can be massively and widely generalized.

Description

technical field [0001] The invention relates to an energy-saving system for directly mixing steam and water for heat exchange, which is mainly used in the field of thermal power generation. technical background [0002] The circulating water cooling tower, a landmark building in a thermal power plant, swallows clouds and mist all the year round, and most of the heat is discharged into the atmosphere through the cooling tower. Pollution, the loss rate of heat energy is higher than the utilization rate; improving the thermal efficiency of thermal power units is a common key technology for energy saving and emission reduction, and the research and development of waste heat recycling is the focus of reducing emissions from cooling towers. [0003] In recent years, heating units have added atomizing nozzles to the throat of the condenser, and used low-temperature desalted supplementary water to transfer heat through contact to absorb part of the condensation heat of steam, so tha...

AI Technical Summary

Problems solved by technology

One is that the condensed water formed by spraying adheres to the tube bundle to form a water film, which is not conducive to the heat transfer of the tube bundle

The second is that the condensed water will meet the recooling of the cooling water pipe during the process of dripping from top to bottom, resulting in supercooling of the condensed water, which will affect the economy of the entire unit

Third, the supplementary water volume is limited by the rated flow rate of equipment such as condensate pumps, shaft-sealed condensers, and low-heat heaters. The effect of contact heat transfer technology is limited by the amount of spray water, and its advantages cannot be fully utilized.

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