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Case Study:

Prevent Live Steam Loss


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Customer Details
Paper Machine #3 of a Kraft Paper Company in Ho Chi Minh City, Vietnam.
Problems
Heavy steam loss.

High SSC of ~ 2 T/T.

Manual steam pressure control.

Paper overheating and breakage.

Low condensate recovery factor.
Objective
To prevent live steam loss and properly utilize flash steam.

To optimise paper machine speed and capacity.

To maximise condensate recovery factor.

To reduce SSC to 1.9 T/T.

Solution
Forbes Marshall carried out a detailed study of the plant, determined areas of concern and redesigned the entire steam system. Following changes were implemented in the new design :
- SteaMon vortex flowmeter for steam flow monitoring incorporated.
- The 26 MF dryers were divided into 06 thermal groups, with 06 individual pressure control stations and PID-based control valves.
- Steam header for thermal groups equipped with compact module thermodynamic trap, air vent, pressure gauge and piston valve.
- Each of the MF dryers equipped with a complete single orifice float trap based steam trapping solution.
- Separate flash vessels to optimize flash steam recovery at pre-section and post-section.
- Multivalve steam operated condensate pump MV55 to pump hot condensate.
Benefits
Significant reduction in SSC - committed was 1.9 T/T; actual SSC after implementation is 1.3-1.4 T/T.

Accurate steam metering.

Improved paper quality.

Increase in daily and monthly paper yield.

Flexible operation.

Safer and cleaner site.

90% condensate recovery factor, with no additional electricity costs.
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