Simultaneous prediction of steam production and reduction efficiency in recovery boilers of pulping process

Damasceno, Arthur Siqueira; Carneiro, Lucas; Andrade, Nayana; Vasconcelos, Suênia Fernandes de; Brito, Romildo Pereira; Brito, Karoline Dantas

doi:10.1016/j.jclepro.2020.124103

Cited by 10 publications

(5 citation statements)

References 15 publications

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“…7). The assembly consists of isolation valves (10,16,18,20,26), a pipe dimension reduction (9,17,27), a lter (11,21), reduction valves (12,22), safety relief valves (13,23), manometer including manometer loop with a valve (14, 24, 28), thermometer (15,25,29), T-piece (30,31) and ange connections (32,33). After the pressure reduction, the steam is then distributed to the manufacturing technology directly to the drying rollers.…”

Section: Steam Reduction Stationmentioning

confidence: 99%

“…In order to achieve good results utilizing the process to get a ber as required, it is necessary to supply a su cient amount of steam at the right temperature, pressure and ow rate (Elustondo et al, 2002, Shuvalov et al, 2017 to each machine. Fiber drying is economically (Seiler et al, 2019), energetically (Aliyon et al, 2019) and ecologically (Ishaq & Dincer, 2021) very demanding process and thus it is necessary to focus on its e ciency (Damasceno et al, 2020, Klemeš & Varbanov, 2018, van Deventer, 1997.…”

Section: Introductionmentioning

confidence: 99%

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Thermal energy savings during cord fiber spinning

Palátka

Mayer

Pexa

et al. 2023

Preprint

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The demand for high-strength grade fibers and consumption of viscose fibers shows increasing tendency and growing trends in use of this product. Regenerated cellulose-based fibers of various properties are produced in order to meet all needs using new production technologies developed especially in recent years. One of the key processes in fiber spinning is continuous drying before final winding on spools. The manufacturing methods used for viscose fibers allows production of various types, parameters and specifications of fibers. It is therefore increasingly necessary to implement and standardize a drying concept to stabilize subprocess in a continuous production manufacturing as much as possible within the desired parameters of the final product. These activities and methods embody concepts for production of the highest quality fibers suitable to both producers and users. Currently, the concept of drying viscose fibers in a continuous production process is a problem that affects its final shape and quality properties such as commercial weight, linear density and tensile properties of all products and lengths for staple fibers as well as shrinkage and twisting for yarns of fibers. Due to that, development of technology enabling maximum stabilization of the drying process to achieve long-term sustainable final fiber quality parameters was adopted as a strategic project, including incorporation of efficient solutions for the overall energy intensity of this process in order to reduce the manufacturing carbon footprint by 23.81%. The production of viscose fibers and the project also aims to achieve significant energy savings up to 24 509.9 GJ·year-1.

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Section: Steam Reduction Stationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal energy savings during cord fiber spinning

Palátka

Mayer

Pexa

et al. 2023

Preprint

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“…Significant amounts of hemicelluloses and lignin from raw materials such as wood are removed as soluble products during the process of making cellulose through pulping and bleaching [10]. Pulping reactions are those from the hydrolysis of the lignin polymer structure to monomeric degradation assisted by acid or base [10,11]. Bleaching of lignin causes the degradation of lignin to fragments by oxidation of lignin.…”

Section: Introductionmentioning

confidence: 99%

“…Chlorine dioxide, oxygen, and hydrogen peroxide are typical bleaching chemicals. The most expensive part of this chemical pulping process is the combined heat and power (electric) system in the recovery boiler which acts as a hindrance in producing cellulose from non-normal biomass [11]. Therefore, chemical pretreatment is a viable method for achieving nano fibrillation in cellulosic materials, as it reduces the energy required for the process.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Lignocellulose Nanofibril from Desilicated Rice Hull with Carboxymethylation Pretreatment

Zahra,

Lim,

Shin

2024

Polysaccharides

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Rice hulls have a high-value potential, and the lignocellulose components are underutilized compared to other biomass resources. Pretreatments such as carboxymethylation of the degree of substitutions (DS) are used to prepare lignocellulose nanofibril (LCNF) from desilicated rice hull (DSRH). High-pressure homogenization (HPH) and grinding are used to process nano fibrillation. The composition of LCNF DS of desilicated rice hull was identified using 1H NMR for polysaccharide composition and DS determination, acetone and hot water extraction to evaluate extractives, and Klason lignin for lignin content. LCNF was prepared using various DS from 0.2 until DS 0.4. The results showed that LCNF DS has a more than −30 mV zeta potential, suitable for stable nanoemulsion formulations. The particle size of LCNF DS decreases with an increasing carboxyl content in the hydrogel and an increasing number of passes through grinding and high-pressure homogenization, of which LCNF DS 0.4 had the smallest width and length. Mechanical processes further reduced the size.

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“…Subsequently, green liquor undergoes a reaction with calcium hydroxide (Ca(OH)2) to recover NaOH in the recausticizing unit. The causticization product is then directed to the white liquor clarifier to remove CaCO3 deposits, producing white liquor suitable for reuse in the digester cooking process (Damasceno et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Determination of Sodium Sulfate Requirement for Obtaining Sodium Sulfide Content in Green Liquor at the Recovery Boiler Unit in PT XYZ North Sumatra

Donda,

Paranita,

Simatupang

2023

IJARSS

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Black liquor is a residual cooking liquid containing organic chemicals utilized as fuel in the recovery boiler and inorganic chemicals that can be recovered into cooking liquid through the recovery boiler process. The recovery boiler is a specialized boiler unit used to restore black liquor by reducing sodium sulfate into sodium sulfide. The research method involved field observations, liquor content analysis, and stoichiometric calculations to determine the sodium sulfate requirement. The calculations revealed that the sodium sulfide content obtained from the recovery boiler process in green liquor was 24.428 g/l Na2O, requiring a reactive amount of 46,5225.0328 kg/day of sodium sulfate. The target sodium sulfide content in the green liquor aimed for was 18-30 g/l. The results indicated that the sodium sulfide content has met the predetermined target and can be utilized for subsequent processes.

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Simultaneous prediction of steam production and reduction efficiency in recovery boilers of pulping process

Cited by 10 publications

References 15 publications

Thermal energy savings during cord fiber spinning

Thermal energy savings during cord fiber spinning

Characterization of Lignocellulose Nanofibril from Desilicated Rice Hull with Carboxymethylation Pretreatment

Determination of Sodium Sulfate Requirement for Obtaining Sodium Sulfide Content in Green Liquor at the Recovery Boiler Unit in PT XYZ North Sumatra

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