Cooling Tower Blowdown
In this article explained about basic concepts of cooling tower types of cooling towers formula for cooling tower efficiency.
Cooling tower blowdown. This is an inherent function of. The logic circuit shown in the figure disables the chemical feeds during blowdown of the tower. As excess heat builds cooling towers reject it into the atmosphere through evaporation which causes the concentration of dissolved solids including calcium magnesium chloride and silica to rise. Process leaks windage and drift are really just forms of uncontrolled blowdown.
The last formula gives you more accurate coc if you have flow measurement facility available for makeup blowdown water in the cooling tower. Aquatech s cooling tower blowdown recovery process can return nearly all of the blowdown volume for use as service or demineralized water. Cooling tower blowdown options. Optimize performance with scalesense.
Increasing cycles from three to six reduces cooling tower make up water by 20 and cooling tower blowdown by 50. A combination of technologies is required to get a stable operation. The cycles of concentration normally vary from 3 0 to 8 0 depending on the design of a cooling tower. Make sure you are getting maximum performance and cycles out of your cooling tower.
It is always advisable to maintain coc as high as possible to reduce make water requirement. The mass balance around a cooling tower as illustrated in the figure to the right is. One of the most efficient used techniques is reverse osmosis. Cstn july 2003 l et s take a look at how to calculate cooling tower blowdown.
The actual number of cycles of concentration the cooling tower system can handle depends on the make up water quality and cooling tower water treatment regimen. Cooling tower blowdown is a difficult stream to treat. Cooling tower blowdown ctb management strategies may involve one or more of the following options. This saves costly chemicals by not allowing them to be fed down the drain with the solids being removed during blowdown.
Cooling tower blowdown equation by james mcdonald pe cwt originally published. Also brief about cooling tower mass balance of make up water requirement in system drift losses or windage evaporation losses blowdown or draw off. More complex cooling tower systems include the addition of biocides inhibitors and dispersants to further protect the equipment. Cooling tower makeup treatment.
Cooling tower cycles of concentration coc are limited by the nature of the impurities they concentrate during the evaporative process. A robust real time sensor is the lowest cost first solution. This process dilutes the system water mineral concentrations that steadily increase due to water evaporation. Reverse osmosis membranes are used to separate dissolved ions and produce a high quality permeate.
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