DOCSLIB.ORG

Continuous Development of Recovery Boiler Technology – 50 Years of Cooperation in Finland

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text

Load more

SUOMEN SOODAKATTILAYHDISTYS FINNISH RECOVERY BOILER COMMITTEE CONTINUOUS DEVELOPMENT OF RECOVERY BOILER TECHNOLOGY – 50 YEARS OF COOPERATION IN FINLAND PROCEEDINGS INTERNATIONAL RECOVERY BOILER CONFERENCE Tampere Hall, Tampere, June 11, 2014 2 3 SUOMEN SOODAKATTILAYHDISTYS CONTENTS FINNISH RECOVERY BOILER COMMITTEE 50th ANNIVERSARY INTERNATIONAL Welcoming words 5 RECOVERY BOILER CONFERENCE Timo Merikallio Tampere Hall, Tampere, June 11, 2014 Recovery boiler research highlights - 10 steps forward 7 Mikko Hupa CONFERENCE CHAIRMAN Esa Vakkilainen, Lappeenranta University of Technology Recovery boilers - history and future 19 PROGRAMME COMMITTEE Esa Vakkilainen Klaus Niemelä, VTT Mikko Hupa, Åbo Akademi University Understanding of black liquor sprays 33 Keijo Salmenoja, Andritz Oy Ari Kankkunen Esa Vakkilainen, Lappeenranta University of Technology Timo-Pekka Veijonen, Stora Enso Oyj Recovery boiler sootblowers - history and technological advances 47 Markus Nieminen, Pöyry Finland Oy Päivi Lampinen, Pöyry Finland Oy Honghi Tran and Danny Tandra CONFERENCE MANAGEMENT Review of recovery boiler superheater material studies 61 Finnish Recovery Boiler Committee Martti Mäkipää and Pekka Pohjanne Markus Nieminen Päivi Lampinen Utilization of process historical data in recovery boilers 77 Song Won Park and Gustavo Matheus de Almeida Finnish Recovery Boiler Committee P.O. Box 4, Jaakonkatu 3 FI-01621 Vantaa XXL recovery boilers - how we developed them 95 FINLAND Kari Haaga Telephone + 358 10 3311 www.soodakattilayhdistys.fi High energy recovery boilers 111 Marja Heinola and Keijo Salmenoja Title: Continuous development of recovery boiler technology – 50 years of cooperation in Finland Editors: Esa Vakkilainen, Päivi Lampinen, Markus Nieminen CFD modeling of kraft recovery boilers - a retrospective 121 ISBN 978-952-93-3984-6 (hardcover) Andrew Jones ISBN 978-952-93-3985-3 (pdf) Entrained flow black liquor gasification - 127 © Copyright Finnish Recovery Boiler Committee, 2014 review of pilot scale research 2004-2014 All rights Reserved Rikard Gebart Cover photos: Scenery of pulp mill at Stora Enso Oyj, Kaukopää, Imatra Tampere Hall, Tampere 2 3 WELCOMING WORDS TIMO MERIKALLIO METSÄ FIBRE OY Recovery boiler co-operation in Finland is recovery boiler day and chief engineer day are celebrating its 50th anniversary this year. To important occasions for networking. celebrate the occasion this anniversary conference Today the FRBC has 23 members which include is arranged at the 2014 International Chemical pulp mills, recovery boiler manufacturers, a num- Recovery Conference (ICRC) in Tampere, ber of insurance companies, engineering compa- Finland. nies, research organisations and universities in Formal co-operation between Finnish recovery Finland. The FRBC publishes different guidelines, boiler users and manufacturers to solve problems recommends best practices and arranges meetings of the field was initiated in 1964 with jointly and conferences. Most of the active work is done sponsored recovery boiler corrosion study from in five subcommittees, which cover the most 1965 to 1968. A few years earlier several mills important areas around the recovery boiler. had experienced severe corrosion in furnace wall During the past ten years the FRBC has conducted tubes which had led to expensive maintenance two large publicly funded research programs. shutdowns. The first research project was partici- The Finnish Funding Agency for Technology and pated by all the Finnish sulphate pulp mills who Innovation (Tekes) was the main financier on both owned recovery boilers. This research project programs. The first program SOTU 2 (2003-2006) succeeded so well that the need to co-operate even concentrated on the possibilities to increase power more closely was recognised and other investiga- production from the recovery boilers. Second tions into various operational and constructional program SKYREC (2008-2012) developed the problems were added to the work programme. studies of SOTU and deepened the understanding Since the beginning, the Finnish Recovery Boiler needed in the design and operation of the high- Committee has been active in promoting safe, efficiency recovery boilers in the future. economic and environmentally friendly operation Today the future of pulp industry in Finland looks of recovery boilers and closely related processes. brighter than some years ago and pulp mills are The strength of recovery boiler co-operation in developed towards bioproduct mills with wider Finland has always been the open discussion on product portfolio and higher energy yield. This recovery boiler and related problems between also puts pressure on chemical recovery and people who have wide-ranging experience and recovery boilers. Therefore, the good research people with in-depth theoretical knowledge. The work on this field and co-operation between the main emphasis of the FRBC has been put on members of FRBC is just as important as it was research, although mutual exchange of experience 50 years ago. and distributing knowledge of recovery equipment and operation both at home and abroad has always It is a great pleasure to welcome you all to this an- been an important part in co-operation. Annual niversary conference. Learn, network and have fun. 4 5 RECOVERY BOILER RESEARCH HIGHLIGHts – 10 STEPS FOrwARD MIKKO HUPA ÅBO AKADEMI UNIVERSITY FINLAND Introduction Kraft recovery boiler technology has advanced The 50-year anniversary seminar of the Finnish dramatically since the first installations in the Recovery Boiler Committee at the International late 1930s. The advancement is naturally visible Chemical Recovery Conference is an excellent in a number of technological aspects but maybe event to summarize some of this great research the most exciting development has dealt with and development work. This presentation aims the furnace process. A deeper and more detailed at a not-so-serious list of top-10 past research ef- understanding of the recovery boiler furnace forts, which have had a significant influence on process has been one key to a number of major recovery boiler design or operation. The focus is improvements of the technology. on research related to liquor combustion and the furnace process. This better understanding is a result of ingenious research efforts by talented people at a number The top-10 ranking is based on a longer initial of universities, research centres and industrial list of candidate research topics defined by this laboratories around the world. Today, the ar- author. (There is no reason to hide the fact that chived scientific literature contains around 8000 the topics selected do quite much reflect the papers dealing with black liquor. Around 1100 interests of the present author.) These suggested of the papers deal more specifically with black topics were then evaluated and ranked by a panel liquor combustion. The interest in black liquor consisted of four senior recovery boiler experts. combustion research has steadily increased since The four panel experts represent boiler users, the 1980’s. During the last years around 20 new boiler manufacturers and boiler consultants, papers have been published per year (Figure 1). and their total common experience of recovery boiler technology exceeds one hundred years. Two of the panel experts come from Europe, two from North America. The panel was asked to comment the suggested research efforts and grade them on a scale from 1 to 5 according to the following: 5 = very sig- nificant/interesting/useful, 1 = only marginally interesting. The panel members did their evalua- tion independently of each other. This presentation cannot be a comprehensive Figure 1. Number of scientific publications review of the history and details of all the re- dealing with black liquor combustion. Based search topics ranked. Each topic is only briefly on the Science Finder by April 2014. 6 7 described together with some comments from consists of a great number of studies in several a) the evaluation panel. In all cases reference is research groups, especially at the University of /hr) made to a few literature sources by some of the 2 Toronto, Åbo Akademi University, Oregon State contributing research groups in the area. University and the Institute of Paper Science and Technology. Most of this advancement took The first five most significant place in the 1980s and early 1990s. research efforts This research has shown how the behaviour of Two research topics received full grades from Gain (g/m Weight the dust particles and deposits is closely con- all the four panel members. Interestingly, both nected to the melting properties of the dust. The were efforts done already several decades ago. Figure 2. Effect of Cr content on corrosion complicated phenomenon of partial melting of Maybe not so surprisingly, they are connected resistance of steels during short term tests the dust was described by four characteristic to the two long-term challenges of the recovery at 400 °C in a simulated lower furnace gas temperatures based on the share of liquid phase b) boiler technology, corrosion and fouling. (Moberg et al. 1974). at that temperature (Backman et al. 1987, Tran 1997): Effort 1 (Shared): Lower furnace wall This research paved the road to replacing of corrosion the furnace carbon steel tubes with composite • First melting temperature, T0 • Sticky temperature, T The first one was the “Research in the mecha- tubes. The composite tube consists of two alloys 15 • Flow temperature, or radical deformation nisms of lower furnace water
Recommended publications
  • Entrained-Flow Gasification of Black Liquor and Pyrolysis Oil

    Entrained-Flow Gasification of Black Liquor and Pyrolysis Oil

    LICENTIATE T H E SIS Department of Engineering Sciences and Mathematics Division of Energy Science Yawer Jafri Entrained-Flow Gasification of Black Liquor and Pyrolysis Gasification of Black Liquor and Pyrolysis Jafri Entrained-Flow Yawer ISSN 1402-1757 Entrained-Flow Gasification of ISBN 978-91-7583-761-1 (print) ISBN 978-91-7583-762-8 (pdf) Black Liquor and Pyrolysis Oil Luleå University of Technology 2016 Pilot-Scale and Equilibrium Modelling Studies of Catalytic Co-gasification Yawer Jafri Energy Engineering Licentiate Thesis Entrained-Flow Gasification of Black Liquor and Pyrolysis Oil Pilot-scale and Equilibrium Modelling Studies of Catalytic Co-gasification Yawer Jafri Energy Engineering Division of Energy Science Department of Environmental Sciences and Mathematics Luleå University of Technology a Printed by Luleå University of Technology, Graphic Production 2016 ISSN 1402-1757 ISBN 978-91-7583-761-1 (print) ISBN 978-91-7583-762-8 (pdf) Luleå 2016 www.ltu.se b Abstract The last couple of decades have seen entrained-flow gasification of black liquor (BL) undergo an incremental process of technical development as an alternative to combustion in a recovery boiler. The ability of the technology to combine chemical recovery with the production of clean syngas renders it a promising candidate for the transformation of chemical pulp mills into integrated forest biorefineries. However, techno-economic assessments have shown that blending BL with the more easily transportable pyrolysis oil (PO) can not only increase the energy efficiency of the conversion process for methanol production, but also remove a significant roadblock to commercial deployment by partially decoupling production capacity from BL availability.
  • TECHNICAL REPORT – PATENT ANALYSIS Enhancing Productivity in the Indian Paper and Pulp Sector

    TECHNICAL REPORT – PATENT ANALYSIS Enhancing Productivity in the Indian Paper and Pulp Sector

    TECHNICAL REPORT – PATENT ANALYSIS Enhancing Productivity in the Indian Paper and Pulp Sector 2018 TABLE OF contEnts ACKNOWLEDGEMENTS 10 EXECUTIVE SUMMARY 11 1 INTRODUCTION 13 2 OVERVIEW OF THE PULP AND PAPER SECTOR 15 2.1. Status of the Indian Paper Industry 15 2.2. Overview of the Pulp and Papermaking Process 20 2.3. Patenting in the Paper and Pulp Industry: A Historical Perspective 22 2.4. Environmental Impact of the Pulp and Paper Industry 25 3 METHODOLOGY 27 3.1. Search Strategy 27 4 ANALYSIS OF PATENT DOCUMENTS USING GPI 31 4.1. Papermaking; Production of Cellulose (IPC or CPC class D21) 31 4.2. Analysis of Patenting Activity in Different Technology Areas using GPI 38 5 ANALYSIS OF THE INDIAN PATENT SCENARIO WITHIN THE CONTEXT OF THIS REPORT 81 5.1. Analysis of Patents Filed in India 81 6 CONCLUDING REMARKS 91 REFERENCES 93 ANNEXURE 94 Annexure 1. Technologies related to paper manufacturing 94 Annexure 2. Sustainable/green technologies related to pulp and paper sector 119 Annexure 3. Emerging Technology Areas 127 List OF FIGURES Figure 2.1: Geographical Spread of Figure 4.11: (d) Applicant vs. Date of Indian Paper Mills .................................16 Priority Graph: Paper-Making Machines Figure 2.2: Share of Different Segments and Methods ........................................42 in Total Paper Production .......................19 Figure 4.11: (e) Applicant vs. Date of Figure 2.3: Variety Wise Production of Priority Graph: Calendars and Accessories ..43 Paper from Different Raw Materials ........19 Figure 4.11: (f) Applicant vs. Date of Figure 2.4: Different Varieties of Paper Priority Graph: Pulp or Paper Comprising Made from Various Raw Materials ..........19 Synthetic Cellulose or Non-Cellulose Fibres ..43 Figure 2.5: Diagram of a Process Block Figure 4.11: (g) Applicant vs.
  • XXL Size Recovery Boilers – Present Status and Future Prospects

    XXL Size Recovery Boilers – Present Status and Future Prospects

    Published May 24, 2017 XXL Recovery Boilers XXL size recovery boilers – present status and future prospects Executive Summary XXL size recovery boilers have operated since 2004, when the first XXL size recovery boiler started up in China. From the process point of view, those boilers have run extremely well, either reaching or exceeding all process requirements. The XXL size recovery boilers are typically designed for high dry solids content, high energy efficiency, low air emissions, and environmentally friendly process solutions. Those boilers burn Non-Condensable Gases (NCG) and other side streams coming from the other parts of the mill, and therefore the XXL size recovery boilers are very important in targeting for odorless pulp mills. However, some units have encountered mechanical problems after start-up due to the large size of certain components in the pressure part. However, all those challenges have been solved and these experiences have helped to develop boilers further toward even safer operation and higher availability. In the future, larger and larger recovery boilers will be built; therefore development work is still needed to reach even lower emissions and better availability. New recovery boilers are very typically planned to operate for at least 18 months. This creates challenges for the engineering of many process systems and components in order to meet the requirements for safety and process optimization. However, long experience with XXL size recovery boilers helps meet these new demands for longer operation periods. © Valmet Page | 1 Published May 24, 2017 XXL Recovery Boilers Introduction Large recovery boilers producing bioenergy have been built all over the world.
  • Systematic Review on Isolation Processes for Technical Lignin

    Systematic Review on Isolation Processes for Technical Lignin

    processes Review Systematic Review on Isolation Processes for Technical Lignin Marlene Kienberger *, Silvia Maitz, Thomas Pichler and Paul Demmelmayer Institute of Chemical Engineering and Environmental Technology, Graz University of Technology, Inffeldgasse 25c, A-8010 Graz, Austria; [email protected] (S.M.); [email protected] (T.P.); [email protected] (P.D.) * Correspondence: [email protected]; Tel.: +43-031-6873-7484 Abstract: Technologies for the isolation of lignin from pulping process streams are reviewed in this article. Based on published data, the WestVaco process, the LignoBoost process, the LigoForce SystemTM and the SLRP process are reviewed and discussed for the isolation of lignin from Kraft black liquor. The three new processes that have now joined the WestVaco process are compared from the perspective of product quality. Further, isolation processes of lignosulfonates from spent sulfite liquor are reviewed. The limitation for this review is that data are only available from lab scale and pilot scale experiments and not from industrial processes. Key output of this paper is a technology summary of the state of the art processes for technical lignins, showing the pros and cons of each process. Keywords: Kraft lignin; lignosulfonates; lignin isolation processes; technical lignin 1. Introduction Citation: Kienberger, M.; Maitz, S.; After cellulose, lignin is the second most abundant biopolymer worldwide. Lignins are Pichler, T.; Demmelmayer, P. non-toxic and renewable, and hence may play an essential role during the change-over from Systematic Review on Isolation a fossil-based to a bio-based economy. The value-added application of technical lignin not Processes for Technical Lignin.
  • Energy Generation and Use in the Kraft Pulp Industry

    Energy Generation and Use in the Kraft Pulp Industry

    ENERGY GENERAnON AND USE IN THE KRAFT PULP INDUSTRY Alex Orr, H.A.Simoos Ltd INTRODUCTION The pulp and paper industry is one of the largest users of energy among the process industries, but most of its requirements, both steam and electrical power, can be produced from by-product and waste material produced within the process. This paper will discuss energy utilisation and generation in kraft pulp mills, and briefly describe the basic kraft pulping process. THE KRAFT PROCESS The kraft process is the most widely used chemical pulping process for a number of reasons: it produces the strongest pulp; it can handle a wide range of furnish: softwood, hardwood, bagasse and bamboo; the cooking chemicals can be recovered economically; it is energy efficient Figure 1 shows a simplified schematic of a kraft mill. The wood furnish supplied to the mill can be in the form of logs (roundwood) or by-product chips from sawmills.. The source of the wood supply has a significant affect on the energy production.. Ifroundwood is chipped the waste wood produced per ton ofchips will be around 200 kg, but when sawmill by-product chips are used the waste wood produced in the sawmill will be in the range of 450 kg/ton chips, as most of the log goes to produce lumbero This waste wood may be available to the pulp mill at a low cost, or even negative cost, allowing the production of low cost steam and electrical power" The chips are mixed with white liquor (NaOH and N~S) and cooked, using steam, in a large pressure vessel called a digester, either in a continuous or batch process.
  • A-RECOVERY+ CHEMICAL RECOVERY SOLUTION A-Recovery+ Chemical TABLE of CONTENTS Recovery Solution: New Opportunities in Kraft Mills

    A-RECOVERY+ CHEMICAL RECOVERY SOLUTION A-Recovery+ Chemical TABLE of CONTENTS Recovery Solution: New Opportunities in Kraft Mills

    SEE THE CHEMICAL CYCLE IN A NEW LIGHT A-RECOVERY+ CHEMICAL RECOVERY SOLUTION A-Recovery+ chemical TABLE OF CONTENTS recovery solution: new opportunities in kraft mills A-RECOVERY+ CHEMICAL SULFURIC ACID With the goal of operating chemical recovery systems in a way that is as effi- RECOVERY SOLUTION PRODUCTION cient and and environmentally sound as possible, while minimizing capital and The next generation solution Production of concentrated operating expenses, A-Recovery+ chemical recovery solutions from ANDRITZ for the chemical recovery commercial-grade sulfuric cycle of pulp mills. acid in the mill can lead to offer new opportunities for kraft mills. significant savings. Over the years, chemical recovery loops have been “closed” to reduce emissions METHANOL LIGNIN RECOVERY and effluents – and to increase recov- PURIFICATION Production of high- ery efficiency. These closures some- Raw methanol is purified to a quality lignin on site can times resulted in an overabundance of merchantable bio-methanol. debottleneck a recovery certain chemicals in the chemical cycle boiler and reduce the cost and sometimes created side streams or of purchased fossil fuels or waste streams that were either disposed generate additional revenue of or ignored. by selling bioproducts. BENEFITS OF A-RECOVERY+ SOLUTIONS • Environmental and economic savings • Further closure of chemical recovery loops • Management and control of sodium/sulfur (Na/S) balance • Generation of key chemicals avoids purchasing costs • Additional opportunities for revenue generation • Removes obstacles to fossil-free operation 2 3 SEEING CHEMICAL RECOVERY IN A NEW LIGHT ANDRITZ has taken a fresh look at chemical recovery and developed technical solutions called “A-Recovery+”. This shines a new light by further closing the chemical cycle and converting side streams.
  • High Power Generation from Recovery Boilers

    High Power Generation from Recovery Boilers

    Published October 25, 2015 High Power Generation from Recovery Boilers High Power Generation from Recovery Boilers - What Are the Limits? Executive Summary Increasing power generation from recovery boilers has been an item of interest since 2000 and really became a strong driver in the last 5 to 10 years. This trend came partly from the pulp and paper (P&P) industry desire to increase efficiency and reduce cost, but also from the legislative authorities' desire to reduce Green House Gas (GHG) emissions and their role in climate change. Current European Union (EU) legislation gives strict limits on how much electrical power consumption of each member country must come from renewable sources by the year 2020. Since the P&P industry represents, especially in Nordic countries, a large portion of the energy generation and consumption, companies are trying to take full benefits of the available financial incentives for renewable electrical power generation and improve their environmental image by minimizing fossil fuel usage. Although current prices for fossil fuel are coming down*, mostly due to shale oil and gas increased production, the demand for increased energy efficiency in pulp mills is a key factor in new recovery boiler projects around the world, with the goal to minimized energy purchase and maximize in-house power generation, often with the goal to generate revenue by selling excess green energy. (* Note: This paper was written in mid-2015. The Äänekoski mill is scheduled to come online in late 2017.) © Valmet Page | 1 Published October 25, 2015 High Power Generation from Recovery Boilers Introduction So, where are we with the technology? The discussion with recovery boilers has traditionally been around the maximum achievable steam parameters (temperature and pressure).
  • Organosolv Pulping of Wheat Straw by Glycerol

    Organosolv Pulping of Wheat Straw by Glycerol

    CELLULOSE CHEMISTRY AND TECHNOLOGY ORGANOSOLV PULPING OF WHEAT STRAW BY GLYCEROL E. SABERIKHAH, J. MOHAMMADI ROVSHANDEH* and P. REZAYATI-CHARANI** Department of Chemistry, Faculty of Science, Islamic Azad University of Rasht, Gilan, Iran *Caspian Faculty of Engineering, University College of Engineering, University of Tehran, Rezvanshahr, Gilan, Iran **Department of Pulp and Paper Technology, Faculty of Forestry and Wood Technology, Gorgan University of Agriculture and Natural Resources, Gorgan, Iran Received May 6, 2010 Pulping of wheat straw was studied with an organic solvent (glycerol) and 2% NaOH as a catalyst, and without catalyst, at various cooking times (180, 90, 45 and 30 min), and at reflux temperature (195-205 °C) as cooking temperature, to investigate the properties of the obtained pulp (cooking yield, kappa number, freeness (CSF), fiber length, α-cellulose, γ-cellulose, ash) and paper (breaking length, burst index, fold endurance, tear index). The best properties of the handsheets were obtained with 2% sodium hydroxide in the cooking solvent, at 30 min as cooking time. As a result of using the processing variables over the variation ranges considered, the following optimum values of the dependent variables were obtained: 64.1% (yield), 64 (kappa number), 300 mL CSF (freeness), 11.89 km (breaking length), 60.38 (folding endurance), 9.27 mNm2g-1 (tear index) and 4.60 kNg-1 (burst index) for pulps and handsheets. The results obtained showed that, under the cooking conditions applied, either including the use of a catalyst or not, delignification increased by increasing the cooking time, although the brightness of the handsheets was reduced. These results involved a secondary reaction between the organic solvent glycerol and the micro-fragments of fibers during cooking.
  • Black Liquor Recovery Boiler Advisory Committee

    Black Liquor Recovery Boiler Advisory Committee

    BLACK LIQUOR RECOVERY BOILER ADVISORY COMMITTEE MINUTES OF MEETING Crowne Plaza Hotel/Atlanta Airport October 24, 25 & 26, 2016 OBJECTIVE BLRBAC’s objective is to promote improved safety of chemical recovery boilers and their auxiliaries through the interchange of technical knowledge, experience, and data on past and any future recovery boiler incidents. Bylaws - 2.1 OFFICERS Chairman: John Gray Tel: 912-277-1388 Rayonier Advanced Materials Cell: 912-321-7582 10 Gum Street [email protected] Fernandina Beach, FL 32035 Vice- Dave Slagel Tel: 912-966-4312 Chairman: International Paper Cell: 912-247-6295 1 Bonnybridge Road [email protected] Port Wentworth, GA 31407 Secretary: Everett Hume Tel: 781-255-4733 FM Global Cell: 413-323-6781 1151 Boston-Providence Turnpike [email protected] Norwood, MA 02062 Treasurer: Len Olavessen Cell: 901 573 8343 LENRO, Inc. [email protected] 1851 N. Virginia Avenue Bartow, FL 33830 REGULAR MEMBERSHIP Organizations operating, manufacturing, or insuring chemical recovery boilers are eligible. ASSOCIATE MEMBERSHIP Organizations having a direct interest or role in the safety of chemical recovery boilers are eligible. CORRESPONDING MEMBERSHIP A company residing outside of the United States which finds it impractical to attend meetings on a regular basis because of distance and expenses, but desires to be involved and informed of BLRBAC activities. Bylaws - 3.1 BLRBAC INTERNET ADDRESS: ---- www.blrbac.org IRS Employer ID/Tax ID (IRS E.I.N.T./T.I.N) ---- #13-366-5137 Meeting Minutes BLRBAC October 7, 2015 EXECUTIVE COMMITTEE John Gray Dave Slagel BLRBAC Chairman BLRBAC Vice-Chairman Rayonier Advanced Materials International Paper 10 Gum Street 1 Bonnybridge Road Fernandina Beach, FL 32035 Port Wentworth, GA 31407 Tel: 904-277-1388 Tel: 912-9664312 Cell: 912-321-7582 Cell: 912-247-6295 [email protected] [email protected] Everett Hume Len Olavessen BLRBAC Secretary BLRBAC Treasurer FM Global LENRO, Inc.
  • Techno Economic Evaluation of Lignin Extraction in a Dissolving Pulp Biorefinery

    Techno Economic Evaluation of Lignin Extraction in a Dissolving Pulp Biorefinery

    NWBC 2017, Stockholm, March 28-30 Techno economic evaluation of lignin extraction in a dissolving pulp biorefinery Lindgren Karin, Samuelsson Åsa, Kulander Ida RISE, Bioeconomy, Stockholm, Sweden Abstract Material and energy balances of a modern theoretical dissolving softwood kraft pulp mill, using pre-hydrolysis in water, have been established. The mill produces 1000 ADt/day and there is an energy excess in the mill that could be used to produce power. If lignin is removed with the LignoBoost process the recovery boiler is unloaded enabling an increased pulp production. With a lignin removal of 0.2 ton/ADt the pulp production could increase 8.5%. According to a sensitivity analysis the lignin price has the largest impact on the economic performance. Introduction Full mill simulation models for market kraft pulp production have been developed in different projects for European softwood, birch and eucalyptus [1]. The models have been used during a number of years both in research activities and in mill specific projects for trouble shooting and as a basis for evaluation of new process concepts. Recently, many mills have shown an interest in upgrading their process to production of dissolving pulp, which traditionally has a higher market price than the market pulp. To meet this trend a simulation model for dissolving pulp production using pre-hydrolysis kraft process was developed at Innventia. Material and energy balances have been established using the simulation program WinGEMS 5.0 and all data presented are for steady state operation. The model has been used to evaluate effects of a lignin removal combined with an increased pulp production.
  • The Next Generation Lignoboost – Tailor-Maid Lignin Production for Different Lignin Bioproduct Markets

    The Next Generation Lignoboost – Tailor-Maid Lignin Production for Different Lignin Bioproduct Markets

    Published May 26, 2017 Next Generation LignoBoost The next generation LignoBoost – tailor-maid lignin production for different lignin bioproduct markets Executive Summary The list of end products that can be made from lignin ranges from fuel applications to carbon fibers and fine chemicals. As more lignin becomes available on the market one key question that needs to be addressed is, of course; What to do with the produced lignin? This paper describes highlights and important results from collaborations aimed to develop add-on processes that will produce lignin with a tailored specification. Pilot scale trials have been carried out producing a bio based carbon black from lignin. Carbon black can be used as reinforcement filler in rubber products. It was also shown that an odor free lignin could be produced by decreasing the guaiacol content in the lignin from 1.42 mg/kg to 0.04 mg/kg. The odor free lignin concept is ready for commercialization enabling production of a completely odor free bio- composite from lignin. © Valmet Page | 1 Published May 26, 2017 Next Generation LignoBoost Introduction Kraft lignin production at large scale is commercial and purified lignin is sold globally. Known trade names for lignin are BioChoice™ (Domtar) and BioPiva™ (UPM). Several pulp and paper manufacturers, such as Stora Enso, Domtar, UPM, Metsä Fibre, Suzano and Fibria, are changing their image to a broader bioproduct scope, including a production of lignin. When producing pulp according to the traditional kraft method the overall yield going from wood to pulp is about 50%. Part of the other 50% is used to produce new cooking chemicals, electricity and heat.
  • Increasing Electricity Generating Potential from Pulp Mills

    Increasing Electricity Generating Potential from Pulp Mills

    Recovery boiler history and future Esa K. Vakkilainen, Lappeenranta University of Technology, P.O. Box. 20, FI-53581 Lappeenranta, Finland INTRODUCTION Recovery boilers are built all over the world. The roots of recovery technology are longer than the roots of recovery boilers. But it wasn’t until the invention of recovery boilers before the Second World War that the pulping technology was revolutionalized. This led to long development of essentially the same type of equipment, culminating into units that are largest biofuel boilers in the world. Early recovery technology concentrated on chemical recovery as chemicals cost money and if one could recycle these chemicals then the profitability of pulp manufacture would improve. For pulp mills the significance of electricity generation from the recovery boiler was for long secondary. The most important design criterion for the recovery boiler was a high availability. The electricity generation in recovery boiler process can be increased by elevated main steam pressure and temperature or by higher black liquor dry solids as well as improving its steam cycle. This has been done in the modern Scandinavian units. EARLY RECOVERY TECHNOLOGY Early recovery technology concentrated on chemical recovery (Deeley and Kirkby, 1967). Chemicals cost money and it was easy to discover that recycling these chemicals would improve the profitability of pulp manufacture (Vakkilainen, 2005). Recovery of pulping chemicals could be based to French chemist Nicholas LeBlanc’s process for producing soda at reducing furnace. A flame oven was hand filled with black liquor, Figure 1. Then the black liquor was dried with flue gases from burning wood.