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Corrugated Containers Waste Management Series: DVD 3
Corrugated Containers Waste Management Series: DVD 3
Modelling and Simulation of the Electric Field and Particle Trajectories in Simultaneous Two-Sided Dry Surface Treatment of Paper, 2003 Advanced Coating Fundamentals Symposium Proceedings
Modelling and Simulation of the Electric Field and Particle Trajectories in Simultaneous Two-Sided Dry Surface Treatment of Paper, 2003 Advanced Coating Fundamentals Symposium Proceedings
Viscoelasticity in Blade Coating of Non-Newtonian Fluids, 1997 Advanced Coating Fundamentals Symposium Proceedings
Viscoelasticity in Blade Coating of Non-Newtonian Fluids, 1997 Advanced Coating Fundamentals Symposium Proceedings
Critical Review of the Use of Fireside Additives for Deposit Control in Kraft Recovery Boilers, 1997 Engineering Conference Proceedings
Critical Review of the Use of Fireside Additives for Deposit Control in Kraft Recovery Boilers, 1997 Engineering Conference Proceedings
Clean Technology Papermaking with Less Water and Energy, 1999 Environmental Conference Proceedings
Clean Technology Papermaking with Less Water and Energy, 1999 Environmental Conference Proceedings
Recirculation of Bleach Plant Waste Liquors, 1993 Environmental Conference Proceedings
Recirculation of Bleach Plant Waste Liquors, 1993 Environmental Conference Proceedings
Influence of Deinked Fiber to Winding of Newsprint Rolls, 19
Influence of Deinked Fiber to Winding of Newsprint Rolls, 1992 Finishing and Converting Conference Proceedings
Journal articles
Magazine articles
A feasibility study of using the organic Rankine cycle for power generation from the flue gases of recovery boilers, TAPPI Journal August 2022
ABSTRACT: Almost 415 tons/h of flue gases with a temperature of 160°C are released to the atmosphere from the recovery boiler of a pulp mill with capacity of 1000 air dried (a.d.) metric tons of pulp per day. This is a large waste heat stream that can be used to generate power, to decrease the operating costs of a pulp mill, and to save carbon dioxide (CO2) emissions. In this work, the feasibility of using an organic Rankine cycle (ORC) with ammonia as the working fluid to generate power from the flue gases of recovery boilers is studied. CHEMCAD and Taguchi methods are used for simulation of the process and for optimization of operating conditions, respectively. The temperature of the ammonia and flue gases at the exit of evaporator, exit pressure of the pump and turbine, and the degree of subcooling of ammonia at the exit of the condenser are five operating parameters that are manipulated to optimize the process. Three different scenarios are defined: minimizing the net power cost, maximizing the ORC efficiency, and maximizing the net profit. Different aspects of these scenarios, such as net power generation, cost, efficiency, and CO2 emission savings are discussed, and optimum operating conditions are reported.
Journal articles
Magazine articles
Causes of poor dregs settling in a green liquor clarifier, TAPPI Journal August 2022
ABSTRACT: A study was conducted to examine the most likely parameters responsible for poor dregs settling at a kraft mill over a 2.5-year period, using multivariate data analysis (MVDA) and machine learning (ML) techniques. The dregs settling behavior seems to be seasonally influenced, implying that wood quality variation can be a factor. The results from the MVDA/ML analysis show that poor dregs settling is correlated to incomplete combustion and/or low load conditions in the recovery boiler, low sulfidity in the causticizing plant, and high flow in the green liquor•weak wash cycle. Compositions of dregs and black liquor were also examined to identify correlations with impaired dregs settling. The results show that poor dregs settling strongly correlates with high silicon (Si) content in dregs and moderately correlates with high iron (Fe) and high aluminum (Al) contents, and with low bulk density in dregs. For mills that experience dregs settling or green liquor filtering issues, regular compositional analyses of dregs, green liquor, weak wash, and black liquor are recommended in order to monitor the dynamics of silicon and other constituents in the recovery cycle.
Journal articles
Magazine articles
Calender barring review with experiences, TAPPI Journal July 2022
ABSTRACT: Excessive calender vibration affects all styles of calender stacks from single to multi-nip, all hard rolls, or a combination of hard and soft rolls. Calender vibration can be forced vibration or self-excited vibration. Forced vibration occurs at the first few harmonics of the calender roll rotational speeds and is caused by imbalance, misalignment, eccentricity, etc. Self-excited vibration, the focus of this paper, occurs at higher frequencies. Feedback paths for self-excited vibration must be understood in order to ameliorate the problem. This is presented in the context of the historical development of the theory of self-excited feedback mechanisms, followed by a survey of self-excited feedback mechanisms in various types of calender stacks. Methodology to determine which feed-back path is present and techniques to control or eliminate the resulting vibration follow. To obtain a flavor of the types of problems faced and practical remedial actions, a variety of experiences with barring issues are provided.