Old Questions Flashcards
The purpose of the hydrapulper system is to permit stock to leave the pulper tub when the correct material size has been reached
True
What are 3 major components of the hydrapulper system
Hydrapulper ragger scavenger
Steam is input to the ________
Hydrapulper
Cutting the baled OCC wire ______ the pulping time
Reduces
The hydrapulper produces _____
Pulp, and stock
Raising the temp of the stock ______ viscosity
Reduces
The pulper pump discharges the accepts stock from the pulper to the ____
Course cyclones
Course cyclones
Remove smaller, high density debris such as sand, staples, and glass
Course screens
Removes oversized, troublesome, and unwanted particles from the good fibers
What are 3 major components of the course cleaning and screening system
No. 2 course cyclones, dump chest, primary course screen
Stock enters the course cleaning and screening system from the _____
Pulper pump
The agitator on the dump chest helps prevent the fibers from combing
True
Gray water is added in the course screening stage for _____ control
Dilution and consistency
The cylinder on the course screens is also known as the basket
True
The primary course screen rejects flow to the ____
Float purger
Fine screens
Remove small contaminants from the stock based on their size and shape
Fine cyclones
Remove small contaminants from the stock based on their specific gravity
What are 3 major components of the fine cleaning and screening system
Secondary fine screen feed pump, fine cyclones, primary fine screens
Rejects from the fine cyclones go to the sand separator
True
Stock is pumped to the fine cyclones by the ______
Primary fine screen feed pump
The fine cyclones junk traps are flushed with water from they gray water HP dilution pump
True
Accepted stock passes out of the top of the fine cyclones to the inlet of the _____
No.1 primary fine screen and
No.2 primary fine screen
The forward cleaners reject heavy contaminates
True
There are _____ stand pipes in the forward cleaning system
1
There are _____ stages of forward cleaners
4
Accepts from the _____ are discharged to the disc thickner
Primary reverse cleaners
The acceptable fibers from the primary for cleaners are sent to the _____
Primary reverse cleaners
There are ___ standpipes in the reverse cleaning system
2
There are ____ stages of the reverse cleaners
3
The standpipes provide the necessary surge volume for the system
True
3 purposes of the pulper and dispersion system are
To disperse any remaining inks, waxes, and plastics in the pulp to achieve a uniform distribution of impurities in the pulp
To attain the desired consistency of the dispersed pulp and send it to the high density storage chest for use in the top and bottom ply blend chests
To bypass some pulp around the dispersion system to achieve the desire throughput to the paper machine
What are 3 major components of the thickener
Disc thickener
Disperser #1 bypass screw conveyor
Disperser #2 bypass screw conveyor
What are 3 major components of the dispersion system
Plug screw
Screw presses
Preheater
What are some outputs of the thickener and dispersion system
Medium consistency pulp to the high density chest
Cloudy filtrate to the gray water chest
Clear filtrate to the clear white water chest
What the best way to describe how the thickener works?
Pulp and water draining through the filter discs form a pulp mat that eventually blocks most of the pulp but allows water to pass through
What best describes the operation of the dispersion system
Thickened pulp is heated to soften impurities which are then distributed uniformly through out the pulp
What’s the best way to describe the medium consistency system
Dispersed pulp is mixed with water to achieve the desired consistency and then pumped to the high density chest for storage
What is the best way to describe the operation of the disperser bypass system
Thickened pulp is mixed with water to achieve the desired consistency and then pumped to the bottom ply blend chest for use in the paper machine
What equipment is used to remove the plastics, wires, cords, etc. from the pulper
Ragger
What major piece of equipment is the scavenger attached to
Hydrapulper
The coarse and fine cyclones feed their rejects to the sand separator
True
The reject sorters output rejected materials and fiber/water. Where is the fiber/water sent?
Screw presses
What is a large holding tank that separates suspended solids in the water by sedimentation and floatation
DAF process clarifier
The float purger is used to separate lighter and heavier components from the screen rejects
True
The purpose of the white water system is to
Maximize the amount of fresh water brought into the mill, and maximize the discharge of pollutants in the mill effluent
What are some ways in which the white water system achieves its purpose
By recovering fibers from the stock preparation systems
By providing dilution water from fresh water instead of using recycled water
By providing some shower water from recycled white water instead of fresh water
What are 3 types of white water
Clear white water
Cloudy white water
Gray water
What are some major components of the course screen chest
Coarse screen chest
Float purger feed pump
Secondary coarse screen feed pump
What are some major components of the gray water chest
Stock dilution pump
Tertiary fine screen feed pump
High pressure dilution pump
What are some major components of the excess paper machine white water chest
Excess paper machine white water transfer pump
Machine pulper dilution pump
High density dilution pump
Water in the gray chest overflows to
The coarse screen chest
Water in the clear white water chest over flows to
The gray water chest
Excess water in the top ply white water chest is pumped to
The excess paper machine white water chest
Describe the way the white water inventory is maintained
By pumping clear water to the mill effluent system requiring make up to the coarse chest
Heat that is transferred to the water by mill processes is dissipated in the _____
Surge pond
What are some major components of the dewatering system
Rotary screen thickener
Screw presses
The surge pond is a major component of the effluent system
True
The primary inputs to the effluent system is _____
Effluent from the mill u-drains
Water from the uhle box
Clear white water from the clear white water transfer pump
If the level of the effluent sump gets too high wastewater is recirculated to the _____
Effluent holding tank
Animal waste in the effluent system poses the hazard of carrying disease causing organisms such as hepatitis b
True
The purpose of the package boiler is to
Heat boiler feed water in order to generate steam for use in the mill steam header
What are some major components of the package boiler steam side
Continuous blowdown system
Feed water pumps
Steam drum
What are some major components of the package boiler fire side
Wind box
Burner
Forced draft fan
Dry steam leaving the steam drum enters the
Steam outlet piping
Describe the way steam is produced in the package boiler
Heat from the furnace boils water in the wall tubes while heat from the exhaust gases boil water in the boiler tube tank
Describe the operation of the economizer
Feed water supplied to the steam drum is preheated by heat transfer from the exhaust gases leaving the boiler
What’s the best way to find a propane or natural gas leak
Smelling it
What’s the best way to find the source of a steam leak
Using a brook held in front of you
