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Induced draft – A mechanical draft tower with a fan at the discharge (at the top) which pulls air up through the tower. The fan induces hot moist air out the discharge. This produces low entering and high exiting air velocities, reducing the possibility of recirculation in which discharged air flows back into the air intake.
Large mechanical induced-draft or forced-draft cooling towers in industrial plants continuously circulate cooling water through heat exchangers and other equipment where the water absorbs heat. That heat is then rejected to the atmosphere by the evaporation of some of the water in cooling towers where upflowing air contacts the downflowing water.
In the present era, mechanical induced draft–type cooling towers are employed in cooling of water. Performance testing of cooling towers (both IDCT and NDCT) shall be carried out as per ATC-105 [4] at a time when the atmospheric conditions are within the permissible limits of deviation from the design conditions.
The impacts include thermal pollution and killing large numbers of fish and other aquatic species at cooling water intakes. [17] [18] A Marley mechanical induced draft cooling tower. The heat absorbed by the circulating cooling water in the condenser tubes must also be removed to maintain the ability of the water to cool as it circulates.
Normally it is done with the help of a forced draft fan. [2] Induced draft: When air or flue gases flow under the effect of a gradually decreasing pressure below atmospheric pressure. In this case, the system is said to operate under induced draft. The stacks (or chimneys) provide sufficient natural draft to meet the low draft loss needs.
The draft (draught in British English) flow rate induced by the stack effect can be calculated with the equation presented below. [12] [13] The equation applies only to buildings where air is both inside and outside the buildings. For buildings with one or two floors, h is the height of the building and A is the flow area of the openings.
However, the mechanical induced-draft or forced-draft wet cooling towers in many large thermal power plants, nuclear power plants, fossil-fired power plants, petroleum refineries, petrochemical plants, geothermal, biomass and waste-to-energy plants use fans to provide air movement upward through down coming water and are not hyperboloid chimney ...
Cooling towers: 2 × mechanical draft cooling towers [a] Cooling source: Lake Michigan: Thermal capacity: 1 × 2565 MW th: Power generation; Units operational: 1 × 805 MW e: Make and model: CE 2-loop (DRYAMB) Nameplate capacity: 805 MW e: Capacity factor: 99.2% (2021) 72.2% (lifetime) Annual net output: 7,014 GWh (2021) External links; Website
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