Home Mills & Technologies Power & Energy

Power and Energy

Mills and Technologies - Power and Energy

Is separator tank size and design critical to the proper operation of dryer cans?

Is separator tank size and design critical to the proper operation of dryer cans?

Absolutely! Undersized separator tanks generally result in high velocities of steam and condensate flow through the inlet separator nozzle, through the shell of tank, and through the outlet blow-through steam nozzle. High velocities do not provide the basis for good separation of the steam and condensate and as a result, the blow-through steam will tend to carryover some condensate. High velocities will also erode the baffles and impingement plates inside the tank much quicker, especially with 2-phase steam and condensate flow potentially causing short-circuiting between the inlet and outlet nozzles. Condensate carryover will accelerate the erosion of downstream piping and thermocompressors and increase the condensate load for the syphons to remove from the dryers. Undersized separator tanks also tend to have poor level control. Separator tanks must be sized based on achieving a low vapor velocity through the tank and adequate liquid retention time.

Read more...
 
Mills and Technologies - Power and Energy

Do high-efficiency thermocompressors save steam?

Do high-efficiency thermocompressors save steam?

High-efficiency thermocompressors do offer a higher entrainment ratio which means a lower motive steam (high-pressure) flow is required to recompress the same amount of s...

Read more...
Mills and Technologies - Power and Energy

Tracking Energy Losses From A Dryer Drainage System

Tracking Energy Losses From A Dryer Drainage System

One method to evaluate dryer section energy efficiency is to track the losses from the dryer drainage system. Any steam not condensed in the dryers to dry paper should be...

Read more...
Mills and Technologies - Power and Energy

Steam, Paper Drying, and the Bottom Line

Steam, Paper Drying, and the Bottom Line

Because energy drives the papermaking process, steam is found in many energy streams in a paper mill. Steam is used to cook fibers for improved sheet strength, heat stock...

Read more...
Mills and Technologies - Power and Energy

What is the role of monitoring in optimizing a dryer section?

What is the role of monitoring in optimizing a dryer section?

Optimizing a dryer section begins with monitoring the dryer section operation and developing a baseline for dryer section performance. The baseline can be compared to the...

Read more...
Mills and Technologies - Power and Energy

Why are dryer surface temperatures measured in a dryer study?

Why are dryer surface temperatures measured in a dryer study?

The surface temperature of a dryer is a good indicator of dryer performance. The temperature of the surface is compared to the temperature of supply steam (the "saturatio...

Read more...
Mills and Technologies - Power and Energy

Energy Optimization of Yankee Hood (continued)

Energy Optimization of Yankee Hood (continued)

Energy consumption at the Yankee Hood can be significantly lowered by raising its supply air temperature. Further savings are possible at these high temperatures with the...

Read more...
Mills and Technologies - Power and Energy

Drying tissue: Hood versus Yankee

Drying tissue:  Hood versus Yankee

The balance between drying with the Yankee Hood versus drying with the Yankee Dryer Cylinder can have an important impact on production cost as well as on sheet quality. ...

Read more...
Mills and Technologies - Power and Energy

Can dryer bars cover only a portion of the dryer and improve the moisture profile?

Can dryer bars cover only a portion of the dryer and improve the moisture profile?

In theory, yes. In practice, this can be very difficult. Dryer bars (the Kadant Johnson trademark is " Turbulator® bars ") are normally installed in paper dryers to cover t...

Read more...
  • «
  •  Start 
  •  Prev 
  •  1 
  •  2 
  •  3 
  •  Next 
  •  End 
  • »
Page 1 of 3
paptac-portal
subscription-enewsletter
access-enewsletters

PaperWeek Banner

buckman banner
Cristini Banner

PaperWeek Banner

kemira banner
BIOFOR International
fpinnovations banner
kadant banner
tecumeth banner
Paper Advance Banner