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The reliability of power and recovery boilers can be critical to a pulp or paper mill's profitability. The causes of boiler failure, which include fuel explosion, poor water treatment, and improper warm-up, are discussed. Preventive measures that can reduce the chance of boiler damage are listed. Operators should observe the burner flame frequently and purge the furnace before igniting a burner., In the age of advanced controls, understanding the fundamentals of power and recovery boiler operation is necessary to prevent disaster After paper machines and pulp dryers, power and recovery boilers [...]

Peracids are again being considered by pulp mills as a possible complement to hydrogen peroxide and other nonchlorine bleaching agents and as a possible complement or alternative to ozone. The peracids group consists of organic and inorganic acids that exhibit a O-O bond. Information on commercial peracids production, practical considerations for the use of peracids, and the outlook for peracids use is presented., Mill trials explore peracids as a potential complement and alternative to non-chlorine bleaching agents for kraft pulp THE DESIRE, TO DEVELOP LOW-COST TECHNOLOGIES for low-AOX and TCF bleaching has renewed [...]

Manufacturers of pulp and paper mill chemicals are listed in alphabetical order by the type of chemicals produced. The specific forms or special compounds of each group of chemicals is also indicated next to each company.

An alphabetical listing of papermaking machinery is presented ranging from absorption towels and accumulators to wrapping machines. The listing serves as a guide to the major types of equipment used in the pulp and paper industry. The guide also includes a comprehensive listing of manufacturers., ABSORPTION TOWERS Advanced Industrial Technology Corp. Airpol Inc. Alby Technologies Ltd. Ambi Inc. Beltran Associates Inc. Ceilcote Air Pollution Control Chemflow Corning Inc., Corning Process Systems Ducon Environmental Systems Inc [...]

Second-generation duplex steels are supposedly more corrosion resistant and cheaper than conventional austenistic AISI types of steel. Alloy 2205 is a second-generation steel, claimed to be cost-competitive with Types 316, 316L, 317 and 317L. Alloy 2205 is applicable to pumps and several plant components in the pulp and paper sector. The benefits of the alloy include increased part life, reduced downtime, less maintenance and less part inventories, leading to lesser overall expenditures., Strength, toughness, resistance to corrosion, pitting, and oxidation lower overall costs of maintaining pump life Last month's article introduced new, commercially available second-generation duplex steels that claim significantly better corrosion [...]

The evolution of equipment design for pulp washing has been very evident for the last 20 years. Today's mills are fortunate to have different washing systems to choose from. These innovative generation systems offer several advantages such as better washing efficiencies, lower operating and capital costs. Some of the reliable alternatives to rotary-vacuum drum washer are Ahlstrom Drum Displacer, Black Clawson Chemi-Washer, IMPCO Compaction Baffle Filter, Kamyr Pressure Diffuser and Sunds Displacement Press., Mills seeking to upgrade or install new systems can find numerous alternatives to conventional rotary-vacuum drum washer approach In the last 10 to 20 years, there have probably been more [...]

A buyers guide to chemicals used by the pulp and paper industry and the companies that prepares and manufactures them is presented. The chemicals presented include acids, compounds and detergents.

Various chemicals that are becoming available for pulp-bleaching sequences are discussed. The chemicals evaluated include activated oxygen, bromine, Caro's acid, chemical bleaching catalysts, chlorine monoxide, flourine and its compounds, nitrogen oxides, nitrosating agents, ozone, peroxyacetic and peroxyformic acids, potassium permanganate, single oxygen, sodium borohydride, sodium chlorate, sodium chlorite, sodium hydrosulfite, supercritical fluids, trichloroisocyanuric acid, uranium trichloride, white-rot fungi and xylanase., Which chemicals currently being tested in laboratories and pilot plants will further transform the bleach plant? As few as 10 years ago, bleaching sequences for chemical pulp were fairly predictable, [...]

First commercial installation, at Mead Corp.'s Chillicothe, Ohio, mill, results in overthick chip removal efficiency of 98% Uniform chips produce better-quality pulp. To this end, chip thickness screening and slicing [...]

Unit helps analyze and implement an effective program to maximize condensate system protection and minimize costs Basic requirements in current operation of boiler systems include maximizing energy efficiency and reliability [...]

PULP MILL AND BLEACH PLANT CHEMICAL PULPING. The pulping process depends on pumps to convey cooling liquors to the cooking vessel, and it consists of several different chemical methods. However, [...]

High-performance greases A 20-page brochure is available on Exxon's extensive line of premium-quality performance greases for pulp and paper applications. Presenting performance data and detailed charts, the brochure highlights the [...]

In the past, mystery often surrounded the selection of control valves in pulp and paper mills. Vendors promoting their wares have made conflicting recommendations on applications ranging from pulp stock [...]

Measurex Corp and Honeywell Inc are nearing completion of their $600 million merger. Honeywell's acquisition of Measurex will boost its presence in the pulp and paper mill integrated system market. Honeywell manufactures control systems for pulp mills and Measurex produces paper machine actuators, sensor-based paper quality control systems and also provides paper quality control services. The newly-formed company to be known as Honeywell-Measurex will be located in Cupertino, CA., Honeywell Inc. and measurex corp. have reached an agreement, announced on January 27, to merge the two companies in an all-ash transaction valued at about $600 million, or about $35 [...]

Paper mills plan to improve capacity and efficiency of old chemical recovery boilers instead of purchasing new units which are too expensive. Old chemical recovery boiler upgrades include conversions to low odor operations, economizer replacements, upgrades of two-level to three-level air delivery systems and modification of cleaning and sootblowing systems. Some mills might consider converting oil boilers to power boilers., Several years ago, the black liquor Recovery Boiler Advisory Committee (BLR-BAC) published data showing that the mean age of recovery boilers in the U.S. was more than 20 years. 'At [...]

Self-lubricating sealing compound, a packing and sealing product manufactured by Tom-Pac Inc., is conserving water and decreasing maintenance costs for pulp and paper manufacturers. The sealing compound provides zero leakage, does not damage the shaft sleeve and requires no cooling or flush water. The self-lubricating sealing compound is more economical than traditional sealing methods and does not require additional parts., THE UNCERTAINTY OF TRYING anything new in the pulp an paper industry leaves many mills somewhat reluctant pioneer new technologies, even when the new technology doesn't involve major capital equipment. [...]

A batch high-consistency pulping system is designed to produce a cleaner, product for high quality papers. This costlier system requires more power and a larger pulper feed conveyer to minimize cycle time. BE&K Engineering claims that 95% of contaminants are removed, compared to only about 65% from a conventional system. Details of the batch system's operation are included., Batch high-consistency pulping is more expensive and requires more power than conventional low-consistency pulping systems. The question then must be asked, 'Why should batch pulping even be considered for old [...]

Pellerin Milnor Corp, a maker of industrial laundry equipment, is developing a waste-paper deinking system. A full-scale pilot version of the system is now in use at the company's Kenner, LA, plant. The company claims that the system is effective at deinking old newspapers, aseptic packaging, milk carton stock and mixed office waste. The system's advantages include low power use and modular design., STANDARD WASTEPAPER DEINKING SYSTEMS HAVE long been compared with laundry washing machines. The operating variables--time, temperature, pH, chemistry, and mechanical action--are the same, as well as the needed result--removal of [...]

Alberta-Pacific Forest Industries Inc's bleached kraft paper mill near Athabasca, Alberta, uses custom alternating current (ac) motors and adjustable-speed drives. Engineering services for the 1,500-metric tpd mill, which started operating in Aug 1993, was provided by H.A. Simons and the Stanley Group. The combination of ac motors with adjustable-speed drives allows reliability and precision speed control in continuous mill operations., * Boyle, Alta.'s 1,500-metric-tpd mill installs a.c. motors and adjustable-speed drives for operating reliability and maintenance ease THE ALBERTA-PACIFIC FOREST INdustries Inc. bleached kraft market pulp mill located near Athabasca, [...]

Bowater Inc Souther Div will begin using its new 4.5-million-lb dry solids/day recovery boiler in Jan 1994. The new boiler will replace boilers one and two which can fire black liquor from a 300-tpd and 600 tpd pulping capacity, respectively. The new boiler, which is the largest Ahlstrom recovery unit in North America, will permit greater pulping capacity, better mill efficiency and improved environmental management., The $1.25-million project is the mill's first turnkey installation; will be completed with 20-month schedule Bowater Inc.'s Southern Div. in Calhoun, Tenn., will bring its new 4.5-million-lb dry solids/day recovery [...]

Weyerhaeuser Paper Co's new preventive maintenance program has significantly lessened lubricant-related problems, resulting to less downtime, maintenance and parts for its Cosmopolis, WA, specialty pulp mill. The relative success of the program is largely attributed to a new ashless paper machine oil, in conjunction with innovative fine-porosity filters. The test oil known as Clarity Paper Machine Oil, was developed by Chevron's Lubricants Div especially for the pulp and paper sector., Washington pulp mill uses new oil and filtration system as part of its preventive maintenance program to significantly reduce lube-related shutdowns Through a new preventive maintenance program, Weyerhaeuser Paper Co. [...]

Fletcher Challenge Corp upgraded the chip screening systems at its Machenzie, B.C. pulp mill. The renovation included replacing the primary and tertiary screens while rebuilding the secondary screens. The new primary screen has an even wider flat design which improves initial separation and screening, thus, eliminating problems during secondary screening. On the tertiary screen, a flexible mat is used to allow adaptation of the screen to climate changes. The upgrading has significantly improve quality of wood chips while minimizing maintenance problems., Mackenzie, B.C., pulp mill's screening configuration evolves through the years to produce higher-quality chips with fewer maintenance hassles North American pulp mills have gradually begun to take greater advantage of [...]

Alternative sources of alkali are needed to replace caustic soda in bleaching of high-yield mechanical pulps. A study of several potential replacements shows that the most viable source of alkali is sodium carbonate, or soda ash. Results show that replacement of up to 67% of caustic soda by sodium carbonate in peroxide bleaching gives off similar brightness with a 22% drop in chemical oxygen demand. However, complete replacement will result in decreased brightness., As caustic soda availability tightens, mills must look to alternative sources of alkalinity for bleaching of high-yield mechanical pulps Currently, the bulk of chlorine and caustic soda are manufactured simultaneously [...]

Modern technologies in harvesting, handling, and pulping nonwood fibers could restore former papermaking importance When considering a greater use of nonwood plant fibers in the U.S., it should be remembered [...]

Southeastern Kraft Mill Uses Online Sensor to Improve Alkali Monitoring New continuous measurement system provides mill with accurate white liquor alkali data for digester alkali charge control The alkali strength [...]

In-Woods Flail Delimber-Debarkers Contribute to Quality Chipping In the past five years, in-woods debarking/chipping has proved to be an effective method of producing quality pulpwood chips, significantly supplementing the industry's [...]

Smurfit-Stone has ordered a turpentine decanter and storage tank for its mill in Fernandina Beach, Fla. The new equipment is scheduled for installation at the mill in January [...]

Weyerhaeuser Paper of New Bern, N.C., has replaced a worn belt press with a Vincent Model VP-16 screw press. Final press cake solids were improved from the 30%'s to 45%, [...]

Fisher-Rosemount's parent company, Emerson Electric Co., has acquired Orion CEM Inc., a supplier of process automation and engineering services for the pulp and paper industry. Orion's pulp and paper process [...]

Tembec Inc., Temiscaming, Que., has placed an order with Thermo Black Clawson for upgrading the washing processes in its 600 a.d. mtpd sulfite pulping line. Tembec ordered a 6m-x-20m Type [...]

Willamette Industries, Port Hueneme, Calif., has placed an order with Voith Sulzer to replace the pulping system at its OCC plant with new machinery. The new TwinPulp III pulping and [...]

NEW RDH SYSTEM KRAFT PULP MILL TO START UP AT BOWATER SOUTHERN Stronger, more uniform pulp, less brightness reversion expected as environmental impact, energy requirements will be reduced Bowater Southern's [...]

ROTARY WASHER PROBLEMS CAN BE REDUCED BY PROCEDURE CHANGES The article 'Pulp Vacuum Washers are Efficient and Reliable When Properly Designed'--Parts I and II (P&P, Oct. 1988, p. 66 and [...]

Moore Products Co., a provider of process measurement and control solutions, and Orion CEM, a consulting firm that implements advanced control solutions, and its sister company, Orion Cybernetics, a provider [...]

New refiners in the paper and pulp industry have become key to the development of the desired fiber properties that make up the type of the paper a customer wants. Pulp manufacturers have developed larger refiners to mix larger batches that help cut production costs. One such refiner is Kvaerner Hymac's HXD refiner, which enables the firm to maintain much flexibility while doing larger loads. The machine includes two refining zones that are independent from each other., The refining stage in the mechanical pulping process and in a paper mill's stock-preparation system plays an important role in developing the properties of fiber fed to the paper machine. [...]

Pulp washing and pressing technology has improved significantly due to water reduction and fiberline effluent concerns in the pulp industry. The technology can be subdivided into three methods, dewatering, pressing and displacement and varies according to the chemicals being washed, water consumption, capital and operating costs, etc. Examples of filter, alternative filter, displacement press, pressure and displacement/press washers are discussed., Pulp washing and pressing technologies advanced significantly during the past few years, driven primarily by environmental and quality demands placed on pulp mill operations. This pressure has been particularly strong [...]

Dry-running mechanical seals, providing reduced energy and water consumption, have become more widely used in pulp and paper mills, but compression packing is still used more widely. Durametallic Corp's Timothy Suprise noted that new mechanical seals offer easier installation. Garlock Inc's Al Harrelson pointed out that compression packing makers have developed their own dry-running products., During the past several years, the dry-running mechanical seal has gained considerably on compression packing as the most environmentally acceptable and water/energy saving method for sealing rotary shaft equipment in [...]