Inlet Filtration Sample Clauses

Inlet Filtration. 8.1.7.2.1 Inlet Filter Compartment The self-cleaning inlet filter compartment utilizes high efficiency media filters which are automatically cleaned of accumulated dust, thereby maintaining the inlet pressure drop below a preset upper limit. This design provides single-stage high efficiency filtration for prolonged periods without frequent replacements. Appropriate filter media is provided based on the site specific environmental conditions. Dust-laden ambient air flows at a very low velocity into filter modules which are grouped around a clean-air plenum. The filter elements are pleated to provide an extended surface. The air, after being filtered, passes through venturis to the clean air plenum and into the inlet ductwork. As the outside of the filter elements become laden with dust, increasing differential pressure is sensed by a pressure switch in the plenum. When the setpoint is reached, a cleaning cycle is initiated. The elements are cleaned in a specific order, controlled by an automatic sequencer. The sequencer operates a series of solenoid-operated valves, each of which controls the cleaning of a small number of filters. Each valve releases a brief pulse of high pressure air into a blowpipe which has orifices located just above the filters. This pulse shocks the filters and causes a momentary reverse flow, disturbing the filter cake. Accumulated dust breaks loose, falls, and disperses. The cleaning cycle continues until enough dust is removed for the compartment pressure drop to reach the lower setpoint. The design of the sequencer is such that only a few of the many filter elements are cleaned at the same time. As a consequence, the airflow to the gas turbine is not significantly disturbed by the cleaning process. The filter elements are contained within a fabricated steel enclosure which has been specially designed for proper air flow management and weather protection. Self-cleaning filters require a source of clean air for pulse-cleaning. Compressor discharge air is used as the pulse air source for filter cleaning. It is reduced in pressure, cooled and dried. This air is already clean because it has been filtered by the gas turbine’s inlet air filter. When compressor discharge air is used to pulse the filter, cleaning is possible only when the gas turbine is running.
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Inlet Filtration 
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