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Rathi B.H.,West Coast Paper Mills Ltd. | Kekre Pradeep V.,West Coast Paper Mills Ltd.
IPPTA: Quarterly Journal of Indian Pulp and Paper Technical Association | Year: 2013

New-Gen Fiber line with ECF bleaching sequence: West Coast Paper Mills, Dandeli has recently expanded its pulp and paper capacity. The company's investment in a brand new 725 TPD Metso fiber-line, replacing the old unit with ecofriendly elemental chlorinefree (ECF) bleaching process has enabled to produce consistent quality of highbright and hi-strength pulp with improved cleanliness & with least pollution load. The high degree of bleaching has also improved the optical properties of paper. Metso has supplied state of art technology for the new 260,000 TPA (725 oven-dry tonnes per day) bleached hardwood pulp mill. The line consists of four Super Batch digesters, knotting, screening, washing by Twin Roll presses, oxygen delignification, ECF bleaching, and an oxidized white liquor plant. The mill also installed a 1,100 TPD chemical recovery plant, a high-efficiency electrostatic precipitator with a sophisticated causticizing plant, a rotary lime kiln, 11 TPD chlorine dioxide plant and the necessary effluent treatment systems. The company's prudent investment in modernizing the pulp mill and chemical recovery plants have resulted in overall operational efficiency with improvement in quality parameters at reduced operational cost. This was made possible through enhanced economies of operating scale and the reduction in consumption of utilities like water, steam & power and the process chemicals. This paper describes the journey of the best practices adopted in new generation fiber line at WCPM to reap the full benefits of the investment. It starts from the raw material end to Bleaching section. Specie wise Separate cooking, improvement in cooking cycle, increasing screening rate, reduction in screening reject, commissioning of on line Kappa analyzer and its control for controlling bleaching chemicals are the best practices implemented. Continual improvement is the vision of WCPM and it is the key to the success of all achievements done so far. It concludes with future action plan for increasing productivity and quality. Source

Aravind P.,Institute of Chemical Technology | Jagannadh R.Y.,Institute of Chemical Technology | Bhandari S.R.,West Coast Paper Mills Ltd. | Rajarao S.H.,West Coast Paper Mills Ltd. | And 2 more authors.
IPPTA: Quarterly Journal of Indian Pulp and Paper Technical Association | Year: 2013

In the present investigation, a judicious effort is done to explore the possibility to re-use pin chips for making bleach grade pulp. The most commonly used hard woods are Eucalyptus, Acacia, Casuarina and Subabul etc. In the background of this, the present work on hard wood pin chips pulping was taken to augment the present and projected raw material shortages. Pin chips are separated from chipper dust and cooked with varying dose of active alkali, followed by ECF bleaching sequence. In pulping, variation of active alkali (as Na2O), bath ratio, cooking temperature and cooking time was closely monitored. Bleaching was done with different doses of C1O2 in D HT and D1 stage and H2O2 in E P stage. In pulping experiment, kappa number target of 18 to 20 was fixed and same pulp after initial optimization in pulping was considered for bleaching. In bleaching, the target brightness of the pulp was fixed at around 89 to 90% and same could be achieved. Source

Rathi B.H.,West Coast Paper Mills Ltd. | Rao M.R.C.,West Coast Paper Mills Ltd. | Anil M.,West Coast Paper Mills Ltd. | Raju K.,West Coast Paper Mills Ltd.
IPPTA: Quarterly Journal of Indian Pulp and Paper Technical Association | Year: 2012

The four major operations done in chemical recovery operation are Evaporation of black liquor, tiring the concentrated black liquor to extract the chemical in recovery boiler, preparation of cooking white liquor and lime mud reburning in rotary lime kiln. The main objectives of the recovery process are to recover the chemical used in cooking of wood and to beneficially recover the thermal energy from combustion of the organics. The present paper describes the efficient performance of west coast paper mill recovery operation w.r.t. Environment and Economics. The latest technologically updated Multiple Effect evaporator main features viz burkeite crystallization, sweetening, condensate segregation and efficient operation of recovery boiler and Electro Static Precipitator along with trouble shooting activities are discussed. The major achievement, which owes to West Cost paper Mill is attaining of highest recovery efficiency among the integrated pulp and paper industries in India. One of the first initiations to the credit of W.C.P.M. is installation of X-filter, which produces very clear green liquor as compared to conventional clarifiers. All these new features with their operation and advantages are covered in detail. The effect of non-process elements and the chemicals used in recovery operation are highlighted. The paper describes the counter steps taken for efficient black liquor management and to improve steam generation and steam economy. The paper is supported with black liquor properties, trend charts and diagrams of unique features. The concluding part includes the future vision of recovery operation w.r.t.evaporator, causticiser and boiler ESP capacity management and at the same time to make efforts to contribute in maintaining eco friendly green environment. Source

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