«Equipment and technologies for oil and gas complex»

Modeling of evaporative air cooling in front of the heat exchange sections of air cooling sections taking into account the distribution of droplets by size

UDC: 621.565.945
DOI: -

Authors:

¹ National University of Oil and Gas "Gubkin University", Moscow, Russia

Keywords: air-cooling unit (ASU), simulation, temperature reduction, water injection, drop, spectrum, droplets distribution by size, evaporation degree

Annotation:

The authors of article consider the issue of assessing the efficiency of fine water spraying in front of the air-cooling units (ASU),’ heat exchange sections. A mathematical model of mass transfer in a two-phase air-droplet flow is presented, taking into account the distribution of injected droplets by size described by the Trösch – Golovkov function, and the analysis of the results of mathematical modeling performed using the MathCad package is given. It is shown that water injection into the air stream in front of the air cooler using fine spray nozzles (maximum droplet diameter is 40 μm), installed at a distance of 2 m from the heat exchange surface, causes 10,5 °C air temperature decrease in front of the device, which in real conditions can be a solution to the problem of cooling the target product in hot weather. However, complete evaporation of droplets does not occur. The use of vertical evaporation panels placed around the air coolers, containing centrifugal nozzles of both fine spray and medium fine atomization (up to 100 μm), makes it possible to achieve an even greater reduction of air temperature in front of the air coolers heat exchange surface. Replacement of the real poly-disperse spectrum of droplets by a mono-disperse one with a diameter equal to the average volume or average volumetric-surface one according to the Trösch – Golovkov distribution provides significantly overestimated results of water injection efficiency, and calculations based on the median diameter show the maximum difference of the cooled air temperature decrease (no more than 1.5 °C), which may be acceptable for preliminary calculations.

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