Dampers

EEI has supplied over 2500 dampers and guillotines to national and international clients for various applications in Boilers, Industrial Fans and Blowers, Pollution control, Flue Gas De-sulphurisation (FGD). We have also designed and manufactured 5m x 5m multi louver opposed blade damper for Larsen & Toubro L&T.

Dampers are used in the air/gas path to detour flow into an alternative duct system or to isolate a process usually for inspection and repair or control the flow.

Single, Multiple Opposed Blade Louver Damper

Depending on the application/ service, the damper can be single or multiple louver type. Opposed blade dampers are used for finer control of a large volume of air/gas.

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Butterfly 2 and 3-way

Butterfly dampers are circular with single or multiple blades. This type of damper is used for unidirectional flow. The 3-way dampers are also known as the diverter dampers.

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Guillotine dampers

Guillotine dampers are used for complete isolation of gas/air and they have a sealing efficiency as high as 99.8 %.

EEI has designed and manufacture different types of Dampers for various applications.

To control the flow, dampers will be of the opposed louver type and isolation dampers can be either parallel louver or guillotine. Double parallel louver dampers and double guillotine dampers are also manufactured to control the flow. Parallel blade louver damper or radial vane damper is applied in clean low temperature air at the forced draft fan inlet to centrifugal fans. These damper impart whirl to inlet air when damper vanes are partly closed, reducing power need. When they are fully open, the damper causes a slight loss in the system. These are applied when the gas is corrosive wet and ash laden near the scrubber both before and after. When an air heater fails the temperature changes can be of nearly 300°.

Specialized damper with actuator types are required for fast opening and tight closure in the gas turbine exhaust. In gas turbine combined cycle or heat recovery systems, a damper directs hot gas exhaust to the stack or to the recovery boiler, the gas is clean but can be corrosive, and is hot at around 900°F or higher.

For baghouses, both regular dampers and special poppet types are required. Tight sealing in dampers is required in the pollution control systems.

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