PULP AND PAPER INDUSTRY PDF DOWNLOAD
It produces 9 million tons of pulp each year (United States Environmental Protection Agency, a). The pulp and paper industry is the most capital intensive in. Recycled fibres have become increasingly important as raw materials in the pulp and paper industry. Full utilisation of recycled fibres can not only ease the shortage of plant fibre resource but also save energy consumption, as well as effectively reduce the pollution load caused by papermaking processes. Metsä Tissue Mänttä mill switches to LNG in tissue paper production . An international conference attended by the largest pulp and paper industry players from.
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The industry has always been interested in reducing the energy needed for pulping. Energy savings not only conserve fossil fuels, but also reduce emissions from the boilers used to generate steam or electricity.
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Despite its extensive use of self-generated energy, the industry is still the third largest industrial user of fossil fuels in the United States. Processes pulp and paper industry being developed and used that utilize low-pressure steam, which was previously vented, to evaporate water.
This steam, called blow heat, can be routed to heat liquor in blow-heat evaporators.
Pulp and paper industry - Wikipedia
Low-pressure steam can sometimes be converted economically to high-pressure steam by vapor recompression. On a paper machine, it is much less energy-intensive to remove water from a paper web by mechanical means than by evaporation.
As much water as possible pulp and paper industry squeezed out of the web in a paper machine press section, but the sheet is still 55 percent water. Extended nip pressing and impulse drying are novel mechanical dewatering methods that have emerged recently, and the future surely holds others.
The general approach to energy reduction could include improvements in overall management of the reuse of low-level energy in both pulping and papermaking.
Also in the pulping pulp and paper industry, using nonfossil fuels in the lime kiln, or eliminating the kiln by developing autocausticizing processes, would contribute additionally to the fossil-fuel independence of the kraft process. Recovered paper is also a great potential source of energy.
Paper has significant heat value, burns cleanly, and is carbon neutral. Paper that is contaminated with materials e.
Pulp and Paper Manufacturing Process in the paper industry
Because more locations are available for burning recovered paper than for reprocessing it, collection logistics can be simplified and transportation energy requirements reduced. Controlling Odor One of the ironies of the industry's attempt at environmental stewardship relates to odor control.
It seems that when odor control equipment is installed at a kraft mill, the number of complaints about bad odors increases. People become accustomed to an odor when it is always around pulp and paper industry notice it when it comes and goes.
Today, with heightened environmental consciousness, people associate the smell of an industrial operation with exposure to a hazard. Hence, there will be pulp and paper industry pressure to achieve and maintain odor control, possibly in excess of what is required by law.
Technology offering superior odor control will be at a premium. The need for low-cost backup odor control devices is also apt to grow in the industry, whether or not they are required. Cost increases, in turn, will make recycled product and process technology relatively more attractive.
They will also raise interest in improving pulping processes to conserve cellulose and increase yield through catalytic pulping with anthraquinone, by defiberizing with less delignification through solvent pulping, or using new mechanical pulping technologies.
Solvent pulping systems require more development to resolve strategies for using by-product carbon and to improve their overall economic feasibility.
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Comparisons between technologies need to be done on the total-mill concept i. Of course, all technologies designed to improve the resource and economic efficiency pulp and paper industry pulping and papermaking must pass environmental muster.
Most of the first part of this paper has described the strides that have been made already by the industry to control pollutants.
The remainder of this section describes new developments and trends that might affect the industry's environmental stewardship in the pulp and paper industry.
Minimal-Impact Philosophy The cornerstone of the minimal-impact philosophy is the effluent-closed mill. The common wisdom is that effluent closure requires eliminating chlorine from the bleach plant because of the corrosivity of aqueous chloride.
This has led to the development of closed kraft TCF bleaching, which is not a field-proven process and might cause contaminants to build up over time.