Process integration study Kraft and Magnefite pulp and paper mill

Technical Report · Fri Dec 01 04:00:00 EST 1989

DOI:https://doi.org/10.2172/5569413· OSTI ID:5569413

The James River Camas mill produces 500,000 tons/year of paper from an integrated operation comprising both Kraft and Magnefite pulping, bleaching, recovery and paper machines. In addition to liquor recovery boilers the mill burns hog fuel and gas to supplement steam requirements. Electrical power demands on the site are met by a combination of on site back pressure turbines and purchased power. The mill was studied by the pinch analysis method and revealed scope to reduce thermal energy requirements by 12% on the Nos. 15, 16 and 20 paper machines and 7% in the cross pinch heat transfer in the existing mill configuration. These savings are equivalent to approximately 73 MBtu/hr in process steam, or 6.2% of total energy use. Pinch techniques reveal additional potential to save between 11--16 MBtu/hr in steam by appropriate process change, principally to black liquor concentrator and evaporator configuration. More significantly, about 36 MBtu/hr steam savings could be achieved by vapor compression heat pumping at the expense of about 1.3 MW electrical power. This amounts to 2.5% of total energy use. To realize these savings appropriate heat recovery networks are required downstream of the modified process equipment. Further scope was identified but not quantified on the remaining paper machines both to make heat savings and to integrate gas turbine power generation. Projects were identified to save up to 38 MBtu/hr of steam by process integration (i.e. 2.7% of total energy use). With appropriate process changes to concentrator configuration this saving can be increased by 9 MBtu/hr. Alternatively, vapor compression heat pumping can achieve 16 MBtu/hr in additional steam savings (1.8% of total energy use). 30 figs., 1 tab.

• Research Organization: Linnhoff March, Inc., Leesburg, VA (United States)
• Sponsoring Organization: DOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FC07-88ID12790
• OSTI ID: 5569413
• Report Number(s): DOE/ID/12790-1; ON: DE91013558
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320303* -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Equipment & Processes
320304 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Waste Heat Recovery & Utilization
ALKALINE EARTH METAL COMPOUNDS
BLEACHING
CHALCOGENIDES
COST BENEFIT ANALYSIS
DOCUMENT TYPES
EFFICIENCY
ENERGY CONSERVATION
ENERGY EFFICIENCY
ENERGY RECOVERY
ENERGY TRANSFER
ENTHALPY
EVAPORATORS
HEAT PUMPS
HEAT RECOVERY
HEAT TRANSFER
HEAT TREATMENTS
HIGH TEMPERATURE
INDUSTRIAL WASTES
INDUSTRY
LIQUID WASTES
MACHINERY
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
OXIDES
OXYGEN COMPOUNDS
PAPER
PAPER INDUSTRY
PHYSICAL PROPERTIES
POWER GENERATION
PROGRESS REPORT
RECOVERY
RETROFITTING
SPENT LIQUORS
STEAM
STEAM TURBINES
THERMODYNAMIC PROPERTIES
TURBINES
TURBOMACHINERY
WASTES
WOOD PRODUCTS INDUSTRY