Service Air and Limestone Conveying System

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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?

To limit dust concentration in the vented air below 30mg per cu.m (D) Signup and view all the answers

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

Limestone collection cycle continues till hopper reaches minimum level (B) Signup and view all the answers

What is the purpose of the Service Air Receiver?

To store compressed air for both ash and limestone conveying (B) Signup and view all the answers

How is bagged limestone initially handled in the plant?

It is lifted and dropped into the fine product hopper by a hoist (D) Signup and view all the answers

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

Reaching a predetermined limestone level in hopper(s) (B) Signup and view all the answers

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

To act as an intermediate storage vessel between the hopper and bunker (B) Signup and view all the answers

What conditions are checked before initiating the limestone conveying cycle?

Availability of limestone in the bunker, bag filter status, and conveying air pressure (D) Signup and view all the answers

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

Level mode (C) Signup and view all the answers

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

To isolate the transmitter vessel for maintenance purposes (A) Signup and view all the answers

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

To connect the exit line of the bulker to the limestone + air mixture line for pneumatic conveying (C) Signup and view all the answers

How is the bed material received at the plant?

In bags (D) Signup and view all the answers

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

To check the availability of bed material in the bunker before initiating the conveying cycle (C) Signup and view all the answers

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

To control the flow of bed material from the hopper to the transmitter vessel (D) Signup and view all the answers

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

Level mode (A) Signup and view all the answers

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

To check the availability of sufficient conveying air pressure before initiating the conveying cycle (D) Signup and view all the answers