XProcSim: An X Window Based GUI for the Dynamic Simulation of the Chemical Recovery Cycle of a Paper Pulp Mill

1994 ◽  
pp. 307-313
Author(s):  
Fátima Pais ◽  
B. Gay ◽  
A. Portugal
Keyword(s):  
Dynamic Simulation ◽  
Pulp Mill ◽  
Chemical Recovery ◽  
Paper Pulp ◽  
Recovery Cycle ◽  
X Window

Fate of phosphorus in the recovery cycle of the kraft pulping process

TAPPI Journal ◽  
2020 ◽  
Vol 19 (3) ◽  
pp. 139-148
Author(s):  
MARYAM SADEGH MOUSAVI ◽  
NIKOLAI DEMARTINI
Keyword(s):  
Kraft Pulp ◽  
Pulp Mill ◽  
Field Studies ◽  
Kraft Pulping ◽  
Pulp Mills ◽  
Recovery Cycle ◽  
Green Liquor ◽  
Green Liquor Dregs ◽  
Kraft Pulp Mills ◽  
Negative Effect

The accumulation of nonprocess elements in the recovery cycle is a common problem for kraft pulp mills trying to reduce their water closure or to utilize biofuels in their lime kiln. Nonprocess elements such as magne-sium (Mg), manganese (Mn), silicon (Si), aluminum (Al), and phosphorus (P) enter the recovery cycle via wood, make-up chemicals, lime rock, biofuels, and process water. The main purge point for these elements is green liquor dregs and lime mud. If not purged, these elements can cause operational problems for the mill. Phosphorus reacts with calcium oxide (CaO) in the lime during slaking; as a result, part of the lime is unavailable for slaking reactions. The first part of this project, through laboratory work, identified rhenanite (NaCa(PO4)) as the form of P in the lime cycle and showed the negative effect of P on the availability of the lime. The second part of this project involved field studies and performing a mass balance for P at a Canadian kraft pulp mill.

Vermicomposting Solid Paper Pulp Mill Sludge: a Three Stages Biodegradative Process

1996 ◽  
pp. 1312-1315
Author(s):  
L. Sampedro ◽  
C. Elvira ◽  
J. Domínguez ◽  
R. Nogales ◽  
S. Mato
Keyword(s):  
Pulp Mill ◽  
Paper Pulp ◽  
Three Stages ◽  
Pulp Mill Sludge

GRAPHICAL REPRESENTATION OF CAUSE-EFFECT RELATIONSHIPS AMONG CHEMICAL PROCESS VARIABLES USING A NEURAL NETWORK APPROACH

2010 ◽  
Vol 09 (01) ◽  
pp. 69-86 ◽  
Author(s):  
GUSTAVO M. DE ALMEIDA ◽  
MARCELO CARDOSO ◽  
DANILO C. RENA ◽  
SONG W. PARK
Keyword(s):  
Visual Information ◽  
Graphical Representation ◽  
Pulp Mill ◽  
Process Variable ◽  
Chemical Recovery ◽  
Human Beings ◽  
Steam Generation ◽  
Fuel Temperature ◽  
Neural Network Approach ◽  
Operating Variables

The extraction of information from tabular data is not a natural task for human beings, which is worse when dealing with high dimensional systems. On the other hand, graphical representations make the understanding easier by exploring the human capacity of processing visual information. Such representations can be used for many purposes, e.g., complex systems structuring which contributes to a better understanding of it. This paper constructs a cause-effect map relating the influence of each input process variable on the steam generated by a boiler. The real case study is based on the operations of a chemical recovery boiler of a Kraft pulp mill in Brazil. The map is obtained by two steps, namely the identification of a neural predictive model for the steam and a study of sensitivity analysis. The numerical results are then depicted in a graphical format using a cause-effect map. This representation highlights the relative importance of the predictor variables to the steam generation. The results, in agreement with the literature, show the higher contribution of the heat released during the fuel burning, and the lower influence of both the fuel temperature and the operating variables associated with the primary level of injection of the combustion air.

Reproductive Steroid Responses in Fish Exposed to Pulp Mill Condensates: An Investigation of Cause Case Study

2010 ◽  
Vol 45 (2) ◽  
pp. 163-173 ◽  
Author(s):  
Deborah L. MacLatchy ◽  
Craig Milestone ◽  
Kevin S. Shaughnessy ◽  
Andrew M. Belknap ◽  
Monique G. Dubé ◽  
...  
Keyword(s):  
High Performance ◽  
Fundulus Heteroclitus ◽  
Solid Phase ◽  
Pulp Mill ◽  
Chemical Recovery ◽  
Plasma Testosterone ◽  
Evaluation Approach ◽  
Identification Evaluation ◽  
Active Substances

Abstract An investigation of cause (IOC) approach integrating artificial stream exposures and laboratory bioassays has been used to identify waste stream sources of contaminants at the Irving Pulp & Paper Ltd. mill, in Saint John, New Brunswick, Canada. Chemical recovery condensates have shown the greatest potential for reducing circulating steroids in mummichog (Fundulus heteroclitus), an endemic fish species. A solid phase extraction (SPE) technique was developed to isolate hormonally active substances from the condensates, and a toxicity identification evaluation approach was used to gain a better understanding of the chemical characteristics of the active substances. Extracts were fractionated by high performance liquid chromatography (HPLC) and the fractions were used in a seven-day bioassay. Dose-response experiments indicated that steroid reductions in male mummichog were observed consistently after a 4% (vol/vol) exposure. At 4% (vol/vol), however, steroid reductions were not observed in fractions of the active SPE extract generated by HPLC. Some fractions actually induced increases in plasma testosterone. Recent work has focused on understanding what methodologies must be used to handle the semivolatile condensates to ensure 100% chemical recovery and retention of biological activity. Results are summarized in the context of developing an industry-wide IOC framework.

scholarly journals Integration of dual fluidized bed steam gasification into the pulp and paper industry

2021 ◽  
Author(s):  
Matthias Kuba ◽  
Florian Benedikt ◽  
Katharina Fürsatz ◽  
Josef Fuchs ◽  
Martin Demuth ◽  
...  
Keyword(s):  
Natural Gas ◽  
Separation Efficiency ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Steam Gasification ◽  
Chemical Recovery ◽  
Recovery Cycle ◽  
Product Gas ◽  
Gas Burner

AbstractThe pulp and paper industry represents an industry sector which is characterised by its already high degree of sustainability. Biomass is a renewable input material, and typically highly developed recovery cycles minimise the loss of chemicals used in the pulping process. However, certain parts of the recovery cycle are still operated on fossil fuels. This study deals with the substitution of the fossil-based gaseous fuel with product gas from biomass gasification.Gasification experiments have shown that bark available at pulp and paper mills is suitable to produce a product gas via dual fluidised bed steam gasification as a promising substitute for natural gas. Based on the comparison of process layouts regarding the separation of non-process elements, separation efficiency is derived for different setups. To ensure operational security of the chemical recovery cycle, comprehensive gas cleaning including heat exchangers, a particle filter, and a liquid scrubber unit is advised. The gas flow of fuel gas into the gas burner is increased as the heating value of the product gas is accordingly lower in comparison to natural gas. Furthermore, adaptions of the gas burner might be necessary to address the earlier ignition of the H2-rich product gas compared to natural gas.

Improving pulp yield for integrated southern hardwood kraft mills—significance and impact on chemical recovery, steam and power generation, and bleaching

TAPPI Journal ◽  
2013 ◽  
Vol 12 (2) ◽  
pp. 41-53 ◽  
Author(s):  
JOHN D. ANDREWS ◽  
PETER W. HART
Keyword(s):  
Pulp Mill ◽  
Cost Effective ◽  
Paper Mill ◽  
Kraft Pulping ◽  
Chemical Recovery ◽  
Pulp Yield ◽  
Pulp And Paper Mill ◽  
Fully Integrated ◽  
Cost Implications ◽  
The Impact

Researchers have been attempting to improve the yield of bleachable-grade kraft pulp for several decades. Wood is typically one of the major costs associated with kraft pulping. Therefore, it is typically assumed that improving pulp yield or conversely, reducing the amount of wood required to make a specific mass of pulp, is a cost-effective, lucrative endeavor. Although this may be true, it is important to understand the impact of increasing pulp yield on the interconnected processes within an integrated pulp and paper mill and to fully evaluate the cost implications on these processes. The current work employed several sets of laboratory pulping conditions and a WinGEMS model of a pulp mill, fully integrated with chemical recovery, power, and recausticization, and pulp drying islands to determine where the largest cost impact associated with improved pulp yield may be experienced.

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