A hundred years of corrosion in the pulp and paper industry

TAPPI Journal ◽  
2018 ◽  
Vol 17 (05) ◽  
pp. 253-258
Author(s):  
Max Moskal
Keyword(s):  
Paper Industry ◽  
Production Capacity ◽  
Corrosion Damage ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Corrosion Control ◽  
Materials Engineering ◽  
The Past ◽  
The Cost ◽  
Control Management

Through the decades, the pulp and paper industry greatly expanded production capacity to meet increasing demands. Correspondingly, the cost of corrosion damage soared. The most serious corrosion control challenges were researched and met by university and governmental researchers, and by task groups within the TAPPI Engineering Division’s Corrosion and Materials Engineering Committee. Today, thanks to material and process advances, mills encounter less corrosion than in the past. This overview takes a historical look back, covering many decades, at how corrosion problems have been managed in the pulp and paper industry. Yet, corrosion keeps on going, and today mills appear less able to manage corrosion problems for which known solutions are available. This paper also addresses the significant yet underrated task of optimizing corrosion control management in the present and into the future. Discussion is provided on best practices needed to mitigate new and ongoing corrosion problems.

scholarly journals Corrosion damage and in-service inspection of retractable sootblower lances in recovery boilers

TAPPI Journal ◽  
2021 ◽  
Vol 20 (10) ◽  
pp. 655-662
Author(s):  
FLAVIO PAOLIELLO
Keyword(s):  
Paper Industry ◽  
Effective Means ◽  
Corrosion Damage ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Near Miss ◽  
Chemical Recovery ◽  
Pulp Mills ◽  
Recovery Boilers ◽  
Component Failures

Several reports of accidents involving serious mechanical failures of sootblower lances in chemical recovery boilers are known in the pulp and paper industry. These accidents mainly consisted of detachment and ejection of the lance tip, or even of the entire lance, to the inside of the furnace, towards the opposite wall. At least one of these cases known to the author resulted in a smelt-water explosion in the boiler. In other events, appreciable damage or near-miss conditions have already been experienced. The risk of catastrophic consequences of the eventual detachment of the lance tip or the complete lance of a recovery boiler soot-blower has caught the attention of manufacturers, who have adjusted their quality procedures, but this risk also needs to be carefully considered by the technical staff at pulp mills and in industry committees. This paper briefly describes the failure mechanisms that prevailed in past accidents, while recommending inspection and quality control policies to be applied in order to prevent further occurrences of these dangerous and costly component failures. Digital radiography, in conjunction with other well known inspection techniques, appears to be an effective means to ensure the integrity of sootblower lances in chemical recovery boilers used in the pulp and paper industry.

scholarly journals Ring removal in rotary kilns used by the pulp and paper industry

TAPPI Journal ◽  
2016 ◽  
Vol 15 (3) ◽  
pp. 205-213 ◽  
Author(s):  
J. Peter Gorog ◽  
W. Ray Leary
Keyword(s):  
Paper Industry ◽  
Cost Effective ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Ring Formation ◽  
Worst Case ◽  
Practical Standpoint ◽  
Soda Content ◽  
Rotary Kilns ◽  
The Cost

Ring formation occurs in the rotary kilns used by the pulp and paper industry to regenerate the lime needed to produce white liquor. The main rings are: burning zone rings, mid-kiln rings, dust rings and/or mud balls, and mud rings. While the exact mechanisms of ring formation are not completely understood, frequent changes in the production rate and the mud solids, high soda content in the mud, and high levels of dust are believed to play a major role in ring formation. The presence of rings can restrict the movement of material through the kiln. If undetected, this can result in overheating of the refractory lining. In the worst case, the presence of rings can lead to unscheduled downtime to clean out the ring and replace damaged refractory bricks. Depending on the severity, the cost of repairs and lost production can be in excess of US$3 million for a single event. Even if the root cause of ring formation is known, from a practical standpoint, it can be difficult to eliminate rings. In mills where ring formation is a recurring problem, mechanical ring removal systems should be considered. This paper describes the use of ring removal systems as a cost effective way to mitigate the problems associated with ring formation.

The Eutrophication of Pulp and Paper Wastewater Recipients

1991 ◽  
Vol 24 (3-4) ◽  
pp. 411-415 ◽  
Author(s):  
J. Wartiovaara ◽  
P. Heinonen
Keyword(s):  
Biological Treatment ◽  
Nutrient Loading ◽  
Paper Industry ◽  
Paper Mill ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Pulp And Paper Mill ◽  
Paper Wastewater ◽  
The Cost

During recent years the BOD-loading of pulp and paper mill wastewaters has decreased dramatically, due to more effective circulation of water in the processes, and the new activated sludge biological treatment plants. This traditional threat to the environment has been forgotten by the scientists who nowadays are more interested in the role of chlorine compounds discharged from bleaching processes. However, eutrophication due to nutrient loading is still present in many recipients of pulp and paper industry. The BOD-reduction has often been carried out on the cost of adding nutrients, pnosphorus and nitrogen to the purification processes. The biological treatment has also decreased the inhibitive effect of wastewater on the biological production of the recipient water body. Therefore, the eutrophication arises immediatly. The authors worry about the research of nutrients; loadings, development trends and eutrophication effects.

Factors affecting Canadian pulp and paper prices

1984 ◽  
Vol 14 (5) ◽  
pp. 683-691 ◽  
Author(s):  
B. K. Singh ◽  
J. C. Nautiyal
Keyword(s):  
Technological Progress ◽  
Economies Of Scale ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Production Costs ◽  
Factors Affecting ◽  
Costs Of Production ◽  
Using Data ◽  
The Cost

Price equations for the following product groupings of the Canadian pulp and paper industry were estimated using data from 1955 to 1981: (i) woodpulp; (ii) newsprint; (iii) "other paper and paperboard"; and (iv) "aggregate paper and paperboard," which includes (ii) and (iii). Price equations were formed on the assumption that firms markup average costs of production to set prices. These equations show the effects of factor costs, economies of scale, and technological progress on the prices of the products. They also help understand relevant aspects of production processes. Newsprint and "other paper and paperboard" production costs and prices are most responsive to the prices of material (woodpulp), labour, and energy, while woodpulp price responds more to the prices of pulpwood and energy. Substantial economies of scale are experienced by newsprint and woodpulp sectors. Such economies in the "other paper and board" sector are nonexistent. Technological progress has also contributed to reduction in the costs of production: 4.3% in woodpulp, 4.4% in "other paper and board," and 2.6% in newsprint per annum. Reduction in the cost of obtaining pulpwood to woodpulp sector is important in reducing the cost of paper and paperboard production. Substitution of existing capital with low energy and labour using capital is also required to lower the costs. Also, efforts to modernize the whole industry and the use of available economies of scale are indicated to keep the Canadian pulp and paper industry competitive in world markets.

Les caractéristiques papetières du bois attaqué par la tordeuse des bourgeons de l'épinette

1989 ◽  
Vol 19 (8) ◽  
pp. 986-991 ◽  
Author(s):  
K. Nlombi ◽  
Z. Koran
Keyword(s):  
Paper Industry ◽  
Electric Energy ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Balsam Fir ◽  
Experimental Conditions ◽  
Burst Strength ◽  
Du Bois ◽  
The Past ◽  
Breaking Length

Chemithermomechanical pulp was manufactured from a supply of budworm-killed balsam fir wood in a pilot plant at the Université du Québec. The physical properties of these pulps were evaluated according to the standard methods of the Canadian Pulp and Paper Association and compared with those of a corresponding sample of experimental pulp prepared from a supply of sound balsam fir wood under the same experimental conditions. It was found that the trees killed 3 years before they were cut produced significant reductions in tear strength (50%), breaking length (25%), burst (24%), and in its brightness (4.5%). The decreases were accompanied by a corresponding increase in the opacity of the sheet (5%) and a significant decrease in energy consumption (15%), the latter representing an important reduction in the electric energy cost of refining. Since in practice budworm-killed wood is always used in some blends with sound wood, the reductions in tear and tensile properties will be directly proportional to the proportions of each type of wood. Thus, in a 50/50 blend of chips made up of sound wood and budworm-killed wood, the burst strength is reduced only by 12%, but at the same time the decrease in the electric bill is also cut in half. Thus, if the budworm-killed forest is harvested not later than 3 years after the trees have been killed, the utilization of this wood in the pulp and paper industry is more promising than we were led to believe in the past.

Ultra- and Nano-Filtration in Advanced Effluent Treatment Schemes for Pollution Control in the Pulp and Paper Industry

1992 ◽  
Vol 25 (10) ◽  
pp. 263-276 ◽  
Author(s):  
A. Zaidi ◽  
H. Buisson ◽  
S. Sourirajan ◽  
H. Wood
Keyword(s):  
Kraft Pulp ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Reduction Factor ◽  
Pulp And Paper ◽  
Effluent Treatment ◽  
High Shear ◽  
Permeate Flux ◽  
The Cost ◽  
Low Shear

The kraft pulp and paper industry is currently faced with the challenge of substantially reducing the discharge of conventional and toxic pollutants to the receiving environment without compromising its competitiveness. Ultrafiltration (UF) and nanofiltration (NF) are among the various unit processes that are being investigated by researchers interested in developing alternative schemes for meeting this challenge. The objectives of the work presented here were: (i) to review the potential uses for UF and NF in the kraft pulp and paper industry and (ii) to evaluate the performance of eleven UF and NF membranes using a caustic extraction stage effluent from a kraft mill pulping softwood with a O D55/C45 EO H D bleaching sequence. The experimental work was conducted with two flat-sheets bench-scale units fed in parallel: a low shear and a high shear unit. The most promising UF membrane gave an average permeate flux of 9 m3m2d for a volume reduction factor (VRF) of 30, under high-shear conditions at 0.69 MPa. The associated COD rejections ranged from 85%–90% at a VRF of 1 down to 70–75% at a VRF of 30. While the results demonstrated in this study show promise, further research is needed to demonstrate the cost effectiveness of both high-shear and low-shear equipment for this application as well as options for the reuse or treatment of the diluted and concentrated streams produced by the UF/NF systems.

scholarly journals PANORAMA DA INDÚSTRIA DE CELULOSE E PAPEL NO BRASIL: 2001 a 2011

FLORESTA ◽  
2013 ◽  
Vol 43 (3) ◽  
pp. 463
Author(s):  
Maritzel Rios Fuentes Coelho ◽  
Marcio Henrique Coelho
Keyword(s):  
International Trade ◽  
Paper Industry ◽  
Production Capacity ◽  
Pulp And Paper Industry ◽  
Pulp And Paper ◽  
Primary Data ◽  
Forest Economics ◽  
Food And Agriculture ◽  
Food And Agriculture Organization ◽  
Hardwood Pulp

Este artigo visa estabelecer um panorama da indústria de celulose e papel sediada no Brasil, evidenciando o desempenho de algumas variáveis importantes para análise do setor, tais como a capacidade de produção, os tipos de produtos, as magnitudes das exportações e das importações e o destino das exportações, o nível e a capacidade de utilização e o preço médio das exportações no período de 2001 a 2011. Para tanto, foram utilizados dados do Ministério do Desenvolvimento, Indústria e Comércio Exterior (MDIC, 2012), da Associação Brasileira de Celulose e Papel (BRACELPA, 2011) e da Organização das Nações Unidas para Alimentação e Agricultura (FAO, 2011). No geral, os resultados revelam que a indústria de celulose vem ganhando espaço no âmbito do comércio internacional, diante de uma nova redistribuição espacial da produção, em função do obsoletismo das indústrias europeias, norte-americanas e canadenses e da inserção da celulose de fibra curta nos diferentes estágios de produção. No caso da indústria de papel, os indicadores apontam um cenário não tão promissor, diante do acirramento da concorrência internacional, embora o mercado interno possa vir a se constituir num grande impulso para a indústria local. AbstractOverview of the pulp and paper industry in Brazil: 2001/2011. This research aims to analyze the performance of the Brazilian pulp and paper industry, from 2001 to 2011, towards the main variables for the sector analysis, such as production capacity, sort of products, magnitude of exports, imports, destination of exports, level and capacity of utilization, and the average price of exports. In order to that, it used primary data from Ministry of Development, Industry and Foreign Trade (MDIC, 2012), Brazilian Association of Pulp and Paper (BRACELPA, 2011) and Food and Agriculture Organization of the United Nations (FAO, 2011). In general, results indicate that cellulose industry has gained importance in international trade, before a new spatial redistribution of production, according to the obsolescence of European, North American and Canadian industries, and the insertion of hardwood pulp in different stages of production. In relation to the paper industry, the results suggest a scenario not as promising as for the pulp one, even though domestic market may constitute a major boost to the industry.Keywords: Forests; forest economics; exports; international trade.

Co-cooking nonwoods with hardwoods

TAPPI Journal ◽  
2014 ◽  
Vol 13 (6) ◽  
pp. 19-24
Author(s):  
TROY RUNGE ◽  
CHUNHUI ZHANG
Keyword(s):  
High Performance Liquid Chromatography ◽  
High Performance ◽  
Paper Industry ◽  
Pulp And Paper Industry ◽  
Strength Properties ◽  
Agricultural Residues ◽  
Kraft Pulping ◽  
Pulp And Paper ◽  
Strength Increase ◽  
Xylan Content

Agricultural residues and energy crops are promising resources that can be utilized in the pulp and paper industry. This study examines the potential of co-cooking nonwood materials with hardwoods as means to incorporate nonwood material into a paper furnish. Specifically, miscanthus, switchgrass, and corn stover were substituted for poplar hardwood chips in the amounts of 10 wt %, 20 wt %, and 30 wt %, and the blends were subjected to kraft pulping experiments. The pulps were then bleached with an OD(EP)D sequence and then refined and formed into handsheets to characterize their physical properties. Surprisingly, all three co-cooked pulps showed improved strength properties (up to 35%). Sugar measurement of the pulps by high-performance liquid chromatography suggested that the strength increase correlated with enriched xylan content.

Sign in / Sign up

Export Citation Format

Share Document