Induced Draft Fan Design

Whilst all fans must generate some level of vibration if this vibration level reaches a certain amplitude it can cause severe induced draft fan problems.

Induced draft fan design. Mechanical draft fans have a peak efficiency point on their fan curve normally located just to the right of the peak of the capacity curve. High efficiency low sound level compact design large sizes can be dismantled more air with less hp easy in operation smooth in running several versions available etc. Direct drive induced. A fan manufacturer will normally size and design the fan so that the performance curve and the system resistance curve intersect at an efficient point.

Usually id should take care of draft loss across the boiler from furnace to air heater and then draft loss across duct collectors like esp wet scrubber or mechanical type cyclone dust collectors etc. Induced draft id fans and forced draft f d fans are avalible in three diffrent drives. Fans driven by 500 horsepower motors. Only a brief description of the model study will be presented.

Induced draft fan or id fan is used to create a vacuum or negative pressure in a system like steam boiler or thermal oil heater. Induced draft id fan is used to draw the flue gases from the system generated from the combustion of fuel. Further details are given in reference 2 the overall design shown in figure 1 was based on a prototype cooling tower located in an oil refinery in regina saskatchewan. One or more bundles of heat transfer surface.

All the burner air dampers should be fully open at this time. A 1 25 scale model of an induced draft counter flow cooling tower was tested in the department of mechanical engineering wind tunnel. Induced draft fan or id fan is required to evacuate the exhaust gases from boiler to atmosphere through duct collectors and chimney. The induced draft fan should be bypassed with the air exiting out of the stack like a natural draft heater.

Induced draft fan is also used to identify the combustion process used in large boilers. If the system resistance curve is not. Using the balancing dampers on the main duct runners the first step is to achieve uniform pressure in all the runners. Unless it is natural draft a driver and power transmission to mechanically rotate the fan or blower.

Components an ache consists of the following components. An air moving device such as a fan blower or stack. When mechanical ventilation is supplied to these boilers the heat transfer rate increases. Metal fatigue and damage to shaft bearings the breakdown of lubricants in bearings the loosening of fasteners and other id.

To describe the general operation of callide c power station with special attention to boiler section pertaining to induced draft id fan operations. Induced draft fan issues caused by excessive vibration include.