Service Air and Limestone Conveying System
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Questions and Answers

What initiates the conveying of limestone to the limestone bunker in the ash handling system?

  • Closure of the inlet valve
  • Positioning of the level probes in the hopper
  • Fixed clearance of limestone in the hopper
  • Injection of conveying air into the vessel (correct)

    • What happens when limestone in the fine product hopper reaches a predetermined level in the level mode?

  • The transmitter vessel releases conveying air into the hopper.
  • The bag filter restricts the vented air flow.
  • The level probe signals the inlet dome valve to open. (correct)
  • The limestone is automatically conveyed to the limestone bunker.

    • How is limestone conveyed to the limestone bunkers in the boiler area?

  • Through gravity pipes
  • Via pneumatic conveying (correct)
  • Through bulkers with a capacity of 20 tons
  • Manually by plant operators

    • What is the purpose of venting conveying air through the bag filter mounted on the bunker?

    <p>To limit dust concentration in the vented air below 30mg per cu.m</p> Signup and view all the answers

    What action is taken once the clearance of limestone cycle is completed?

    <p>Limestone collection cycle continues till hopper reaches minimum level</p> Signup and view all the answers

    What is the purpose of the Service Air Receiver?

    <p>To store compressed air for both ash and limestone conveying</p> Signup and view all the answers

    How is bagged limestone initially handled in the plant?

    <p>It is lifted and dropped into the fine product hopper by a hoist</p> Signup and view all the answers

    What triggers the dome valve to close in the ash handling system?

    <p>Reaching a predetermined limestone level in hopper(s)</p> Signup and view all the answers

    What is the purpose of the transmitter vessel in the limestone conveying system?

    <p>To act as an intermediate storage vessel between the hopper and bunker</p> Signup and view all the answers

    What conditions are checked before initiating the limestone conveying cycle?

    <p>Availability of limestone in the bunker, bag filter status, and conveying air pressure</p> Signup and view all the answers

    What mode of operation is mentioned for the limestone conveying system?

    <p>Level mode</p> Signup and view all the answers

    What is the purpose of the manual knife gate valve in the limestone conveying system?

    <p>To isolate the transmitter vessel for maintenance purposes</p> Signup and view all the answers

    What is the purpose of the cam lock coupling mentioned in the text?

    <p>To connect the exit line of the bulker to the limestone + air mixture line for pneumatic conveying</p> Signup and view all the answers

    How is the bed material received at the plant?

    <p>In bags</p> Signup and view all the answers

    What is the purpose of the level transmitter mentioned in the text?

    <p>To check the availability of bed material in the bunker before initiating the conveying cycle</p> Signup and view all the answers

    What is the purpose of the pneumatically operated dome type inlet valve mentioned in the text?

    <p>To control the flow of bed material from the hopper to the transmitter vessel</p> Signup and view all the answers

    What is the mode of operation for conveying bed material mentioned in the text?

    <p>Level mode</p> Signup and view all the answers

    What is the purpose of the pressure transmitter on the air receiver mentioned in the text?

    <p>To check the availability of sufficient conveying air pressure before initiating the conveying cycle</p> Signup and view all the answers

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