Scrubber System Sample Clauses

Scrubber System. The function of the Scrubber System is to remove fly ash and sulfur dioxide (SO2) from the flue gas by washing with a recycled liquor. Eight scrubber vessels are installed each at Unit 3 and 4 into which boiler combustion gases are ducted. At full load it requires that seven scrubbers operational to achieve sufficient SO2 and particulate removal to comply with environmental regulations. Since it was expected that at any given time at least one scrubber train will be down for maintenance, it was necessary to install eight scrubber trains in order to assure reliable plant operation in compliance with the law. The flue gas enters the top of each scrubber vessel in the venturi section where the gas is contacted with finely atomized scrubber slurry. The flue gas is adiabatically cooled and saturated by the evaporation of water from the scrubber slurry. In the venturi, fly ash particulates are removed by the slurry droplets during collisions caused by the sudden changes in gas velocity. The proper gas pressure drop across the venturi to achieve these changes in velocity is maintained by raising or lowering a xxxxx xxx located in the throat of the venturi. SO2 is also absorbed and removed by the slurry in the venturi. After the flue gas leaves the venturi, it passes upward through an absorption spray zone where the gas is sprayed with more scrubber slurry. These sprays remove additional SO2. Then the flue gas passes through a wash tray where it is bubbled through a stream of wash tray slurry. The main purpose of the wash tray is to remove and dilute the slurry droplets entrained in the flue gas from the venturi and absorption sprays. The wash tray also removes small amounts of fly ash and SO2. A spray keeps the wash tray from plugging and also maintains the proper water balance in the scrubber. When the flue gas bubbles through the wash tray it produces a mist of water droplets containing some dissolved and suspended solids. This mist is removed by a mist eliminator. The mist eliminator is made up of a series of zigzag parallel plates. The mist droplets strikes these plates, cling to them, and then fall back onto the wash tray. The flue gas then leaves the scrubber vessel. At this point the flue gas has been cooled to a temperature of about 120OF and is saturated as a result of water introduced in the scrubbing process. Approximately 95% of the SO2 and over 90% of the fly ash particulates are removed. Because of the action of the scrubber in cooling and saturatin...
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Related to Scrubber System

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  • Monitoring System In each case in which the Custodian has exercised delegated authority to place Assets with a Foreign Custodian, the Custodian shall establish a system, to re-assess or re-evaluate selected Foreign Custodians, at least annually in accordance with Rule 17f-5(c)(3).

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  • Hardware and Software Requirements In order to access and retain Disclosures electronically, you must satisfy the following computer hardware and software requirements: access to the Internet; an email account and related software capable of receiving email through the Internet; a web browser which is SSL-compliant and supports secure sessions, and hardware capable of running this software.

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