Minimum motive steam consumption on full cycle optimization with cumulative fouling consideration for MED-TVC desalination system

Our previous investigation [1] re-analyzed the data from Basta and co-workers (1992 TAPPI Pulping Conference) to demonstrate how oxidative alkaline extraction can be augmented and how these changes affect chlorine dioxide consumption with elemental chlorine-free (ECF) sequences. The current study manipulates extraction delignification variables to curtail bleaching costs with a conventional U.S. Southern softwood kraft pulp. The economic advantages of ~0.35% to 0.65% H2O2 peroxide reinforcement in a 70°C (EOP)-stage versus 90°C (EO)-stage are predisposed to the brightness targets, to short or long bleach sequences, and to mill energy costs. Minimized bleaching costs are generally realized when a 90°C (EO) is employed in D0(EO)D1 bleaching, whereas a 70°C (EOP) is economically advantageous for D0(EOP)D1E2D2 bleaching. The findings we disclose here help to clarify previous ECF optimization studies of conventional softwood kraft pulps.

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PAPER PHYSICS. The web structure in relation to the furnish composition and shoe press pulse profiles during wet pressing

Nordic Pulp & Paper Research Journal ◽

10.3183/npprj-2012-27-04-p798-805 ◽

2012 ◽

Vol 27 (4) ◽

pp. 798-805 ◽

Cited By ~ 3

Author(s):

Collin Hii ◽

Øyvind W. Gregersen ◽

Gary Chinga-Carrasco ◽

Øyvind Eriksen ◽

Kai Toven

Keyword(s):

Porous Structure ◽

Peak Pressure ◽

Pulse Length ◽

Pressure Profile ◽

Steam Consumption ◽

Web Structure ◽

Wet Pressing ◽

Solids Content ◽

In The Beginning ◽

The Web

Abstract This study shows that wet-pressing TMP and DIP with a shoe press pulse may yield similar afterpress solids, provided that an adequate shoe pulse length with similar pressure profile is applied. A wet web with more porous structure in the sheet dewatering (felt) layer seems to contribute to the increased dewatering during wet pressing. In addition, a shoe press pulse with high peak pressure at the end yields higher solids content after wet-pressing and higher bulk compared to a pulse with a peak pressure in the beginning. The increased dewatering during wet-pressing implies a reduction of steam consumption in the dryer.

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Computational simulation applied to improve fuel bioethanol distillation

Sugar Industry ◽

10.36961/si14538 ◽

2013 ◽

pp. 645-650

Author(s):

Fabio R.M. Batista ◽

Antonio J.A. Meirelles

Keyword(s):

Experimental Validation ◽

Computational Simulation ◽

Industrial Plant ◽

Careful Study ◽

Optimal Conditions ◽

Liquid Equilibrium ◽

Steam Consumption ◽

Wine Composition ◽

Standard Solution ◽

Central Composite

Experimental validation of the process simulation a typical industrial bioethanol unit was conducted, comparing the obtained results with the information collected in an industrial plant. A standard solution containing water, ethanol and 17 congeners was chosen to represent the fermented must, whose composition was selected according to analyses of samples of industrial wines. A careful study of the vapour-liquid equilibrium of the wine components was performed. An attempt to optimise the industrial plant was conducted considering two optimising approaches: the central composite design (CCD) and the Sequential Quadratic Programming (SQP). The process was investigated in terms of bioethanol alcoholic graduation, ethanol recovery, energy consumption and ethanol loss. The results showed that the simulation approach was capable of correctly reproducing a real plant of bioethanol distillation and that the optimal conditions are slightly different from those used at the industrial plant investigated. Substantial fluctuations in wine composition were easily controlled for the two loop controls preventing an off-specification product. The optimised conditions indicate a distillation process able to produce bioethanol according to the legislation requirements and with appropriate steam consumption and loss of ethanol. However, for the production of alcohols with superior qualities, substantial changes in the production system may be required.

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Machine Learning-Based Energy System Model for Tissue Paper Machines

Processes ◽

10.3390/pr9040655 ◽

2021 ◽

Vol 9 (4) ◽

pp. 655

Author(s):

Huanhuan Zhang ◽

Jigeng Li ◽

Mengna Hong

Keyword(s):

Neural Network ◽

Energy Consumption ◽

Gradient Boosting ◽

Paper Machine ◽

Steam Consumption ◽

Tissue Paper ◽

Paper Machines ◽

Energy Consumption Model ◽

Extreme Gradient Boosting ◽

Consumption Model

With the global energy crisis and environmental pollution intensifying, tissue papermaking enterprises urgently need to save energy. The energy consumption model is essential for the energy saving of tissue paper machines. The energy consumption of tissue paper machine is very complicated, and the workload and difficulty of using the mechanism model to establish the energy consumption model of tissue paper machine are very large. Therefore, this article aims to build an empirical energy consumption model for tissue paper machines. The energy consumption of this model includes electricity consumption and steam consumption. Since the process parameters have a great influence on the energy consumption of the tissue paper machines, this study uses three methods: linear regression, artificial neural network and extreme gradient boosting tree to establish the relationship between process parameters and power consumption, and process parameters and steam consumption. Then, the best power consumption model and the best steam consumption model are selected from the models established by linear regression, artificial neural network and the extreme gradient boosting tree. Further, they are combined into the energy consumption model of the tissue paper machine. Finally, the models established by the three methods are evaluated. The experimental results show that using the empirical model for tissue paper machine energy consumption modeling is feasible. The result also indicates that the power consumption model and steam consumption model established by the extreme gradient boosting tree are better than the models established by linear regression and artificial neural network. The experimental results show that the power consumption model and steam consumption model established by the extreme gradient boosting tree are better than the models established by linear regression and artificial neural network. The mean absolute percentage error of the electricity consumption model and the steam consumption model built by the extreme gradient boosting tree is approximately 2.72 and 1.87, respectively. The root mean square errors of these two models are about 4.74 and 0.03, respectively. The result also indicates that using the empirical model for tissue paper machine energy consumption modeling is feasible, and the extreme gradient boosting tree is an efficient method for modeling energy consumption of tissue paper machines.

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Innovation in a Continuous System of Distillation by Steam to Obtain Essential Oil from Persian Lime Juice (Citrus latifolia Tanaka)

Molecules ◽

10.3390/molecules26144172 ◽

2021 ◽

Vol 26 (14) ◽

pp. 4172

Author(s):

José Daniel Padilla-de la Rosa ◽

Magaly Dyanira Manzano-Alfaro ◽

Jaime Rosalío Gómez-Huerta ◽

Enrique Arriola-Guevara ◽

Guadalupe Guatemala-Morales ◽

...

Keyword(s):

Essential Oil ◽

Oil Recovery ◽

Steam Distillation ◽

Optical Rotation ◽

Process Time ◽

Chemical Compositions ◽

Distillation Process ◽

Steam Consumption ◽

Lime Juice ◽

Oil Fractions

The citrus industry is one of the most important economic areas within the global agricultural sector. Persian lime is commonly used to produce lime juice and essential oil, which are usually obtained by batch distillation. The aim of this work was to validate a patented continuous steam distillation process and to both physically and chemically characterize the volatile fractions of essential Persian lime oil. Prior to distillation, lime juice was obtained by pressing the lime fruit. Afterwards, the juice was subjected to a continuous steam distillation process by varying the ratio of distillate flow to feed flow (0.2, 0.4, and 0.6). The distillate oil fractions were characterized by measuring their density, optical rotation, and refractive index. Gas chromatography GC-FID was used to analyze the chemical compositions of the oil fractions. The process of continuous steam distillation presented high oil recovery efficiencies (up to 90%) and lower steam consumption compared to traditional batch process distillation since steam consumption ranged from 32 to 60% for different steam levels. Moreover, a reduction in process time was observed (from 8 to 4 h). The oil fractions obtained via continuous steam distillation differed significantly in their composition from the parent compounds and the fractions.

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Measurement of Steam Consumption in Stema Sterilizers and Effectiveness of Steam Filters

JAPANES JOURNAL OF MEDICAL INSTRUMENTATION ◽

10.4286/ikakikaigaku.56.1_15 ◽

1986 ◽

Vol 56 (1) ◽

pp. 15-22

Author(s):

Masayoshi Furuhashi

Keyword(s):

Steam Consumption

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Analysis of Thermal Properties on Backward Feed Multieffect Distillation Dealing with High-Salinity Wastewater

Journal of Nanotechnology ◽

10.1155/2015/518015 ◽

2015 ◽

Vol 2015 ◽

pp. 1-7 ◽

Cited By ~ 2

Author(s):

Jianliang Xue ◽

Qinqin Cui ◽

Jie Ming ◽

Yu Bai ◽

Lin Li

Keyword(s):

Heat Transfer ◽

Thermal Properties ◽

Total Heat ◽

Total Heat Transfer ◽

Steam Consumption ◽

Capital Costs ◽

Evaporation Temperature ◽

Theoretical Investigations ◽

Output Ratio ◽

Salinity Wastewater

Theoretical investigations on thermal properties of multieffect distillation (MED) are presented to approach lower capital costs and more distillated products. A mathematical model, based on the energy and mass balance, is developed to (i) evaluate the influences of variations in key parameters (effect numbers, evaporation temperature in last effect, and feed salinity) on steam consumption, gained output ratio (GOR), and total heat transfer areas of MED and (ii) compare two operation modes (backward feed (BF) and forward feed (FF) systems). The result in the first part indicated that GOR and total heat transfer areas increased with the effect numbers. Also, higher effect numbers result in the fact that the evaporation temperature in last effect has slight influence on GOR, while it influences the total heat transfer areas remarkably. In addition, an increase of feed salinity promotes the total heat transfer areas but reduces GOR. The analyses in the second part indicate that GOR and total heat transfer areas of BF system are higher than those in FF system. One thing to be aware of is that the changes of steam consumption can be omitted, considering that it shows an opposite trend to GOR.

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Low-cost steam consumption control system for batch pulp cooking

Control Engineering Practice ◽

10.1016/0967-0661(95)00007-h ◽

1995 ◽

Vol 3 (3) ◽

pp. 357-363 ◽

Cited By ~ 3

Author(s):

J. Petrovčič ◽

N. Hvala ◽

A. Bitenc ◽

S. Strmčnik

Keyword(s):

Control System ◽

Low Cost ◽

Steam Consumption ◽

Consumption Control

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Study of Three-Kettle Coagulating Process in Production of Cis-1,4-Polybutadiene Rubber

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.608-609.1030 ◽

2014 ◽

Vol 608-609 ◽

pp. 1030-1034

Author(s):

Jing Xu

Keyword(s):

Economic Development ◽

Process Optimization ◽

Condensation Process ◽

Residual Liquid ◽

Bottom Temperature ◽

Steam Consumption ◽

Polybutadiene Rubber ◽

Before And After ◽

Solvent Residue

with the economic development, the three-kettle condensation process is more and more widely applied. This paper introduces three-kettle condensation and its features and advantages. Comparing the changes of steam consumption and solvent residue in rubber before and after the modification of the cis-1,4-polybutadiene rubber condensation system, the obtained result shows that compared with the two-kettle condensation, the three-kettle condensation system can steam by 25%, and also can reduce 50% of the solvent residual liquid in rubber. The results after the process optimization on three-kettle condensation system show that the bottom temperature of No.1 kettle is 85 °C, and the top pressure is 48 kPa; the bottom temperature of No. 2 kettle is 102 °C, and the top pressure is 90 kPa; and the top pressure of No. 3 kettle is 10 kPa. In addition, here points out the differences in optimization, and gives suggestions to the optimization.

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Investigation of Flashing Flow in a Siphon to Extract Condensate in Paper Dryer Application

Volume 8: Heat Transfer and Thermal Engineering ◽

10.1115/imece2019-10318 ◽

2019 ◽

Author(s):

Hamed Abdul Majeed ◽

Ting Wang

Keyword(s):

Cfd Simulation ◽

Paper Industry ◽

Volume Ratio ◽

Piping System ◽

Drying Process ◽

Local Pressure ◽

Steam Consumption ◽

Paper Drying ◽

Computational Fluid Dynamics Cfd ◽

State Case

Abstract The paper industry uses steam to dry paper web through cylinder dryers. As steam condenses inside the cylinder dryer, the condensate is removed by means of either a stationary or a rotary siphon. However, during the siphoning process for transporting the condensate, flashing of the condensate occurs, which could cause backflow or discontinuity in the siphoning process. To resolve this flashing issue, two approaches have been employed: (a) increasing the amount of steam supplied to the cylinder to “blow-through” the stalled condensate-steam mixture and (b) reducing the back pressure by inducing “suction” through a thermocompressor from downstream. This practice of employing push from the upstream and suction from the downstream requires excessively large amounts of high-grade steam, resulting in an estimated 10 to 15 %, 15 to 25%, and 40 to 90 % of blow-through steam for stationary siphons, rotary siphons, and Yankee dryers respectively. The objective of this study is to investigate and improve understanding of the flashing phenomena during condensate transport through the siphon and piping system in order to develop means to reduce this excessive steam consumption during the paper drying process. A computational fluid dynamics (CFD) simulation is performed that uses the Eulerian-Eulerian multiphase method. The steady-state case is first solved to obtain the flow field without flashing. Then the transient method is initiated by employing flashing and condensation models. The results show that reduction of local pressure triggers flashing, however, flashing in turn reduces local temperature, and subsequently induces condensation, resulting in an alternating flashing and condensation behavior. To maintain continuity of the siphon flow, the inlet pressure fluctuates corresponding to the variation of total vapor volume ratio inside the siphon. The results will be used to modify the current siphon system design and operating practices to reduce steam consumption.

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