Specific energy consumption of cake dewatering with vacuum filters

Huttunen, Manu; Nygren, Lauri; Kinnarinen, Teemu; Häkkinen, Antti; Lindh, Tuomo; Ahola, Jero; Karvonen, Vesa

doi:10.1016/j.mineng.2016.10.025

Cited by 23 publications

(11 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The specific energy requirement of vacuum filtration increases exponentially as the pressure difference is increased. Similar findings were also observed by the authors of [28] in experiments conducted using a Büchner filter. For experiments with the filter cake solids content between 0.835 and 0.845, the results show nearly a tenfold increase in the specific energy consumption of vacuum filtration from 29.5 to 291 kJ/kg as a result of the increasing pumping demand for maintaining a higher pressure difference.…”

Section: Specific Energy Consumptionsupporting

confidence: 89%

Real-time monitoring of the moisture content of filter cakes in vacuum filters by a novel soft sensor

Huttunen

Nygren

Kinnarinen

et al. 2019

Separation and Purification Technology

Self Cite

View full text Add to dashboard Cite

The moisture content of filter cakes is probably the most important characteristic that should be kept at a desired level in industrial cake filtration applications to maintain consistent product quality and minimize energy consumption. Most of the currently applied methods for contactless real-time monitoring of the moisture content are based for example on x-ray or microwave techniques, and therefore, the equipment for the purpose is highly specialized. This paper introduces a novel soft sensor for filter cake moisture estimation that uses machine learning algorithms and data collected with basic process instrumentation. The method is primarily based on the cooling effect observed in the cake and air, caused by evaporation of liquid from the cake during the dewatering period, and it can be supported by other process data. The specific energy consumption of vacuum filtration and the subsequent thermal drying to zero moisture is also analyzed. The results of pilot-scale experiments with calcite slurry and a horizontal belt vacuum filter show that in order to minimize the specific energy consumption of vacuum filtration, it is crucial to find the right combination of slurry concentration, vacuum level, and mass of filter cake per unit area. The proposed method for estimating the filter cake moisture content is especially suitable for real-time monitoring and control, enabling also considerable reduction in the energy consumption of the overall process. When applying the proposed soft sensor method in a pilot-scale process, the mean absolute error of the estimated moisture content of the filter cake is ~0.4 percentage points when the temperature of air at the vacuum pump inlet and the vacuum pump air flow rate are included in the input variables.

show abstract

Section: Specific Energy Consumptionsupporting

confidence: 89%

Real-time monitoring of the moisture content of filter cakes in vacuum filters by a novel soft sensor

Huttunen

Nygren

Kinnarinen

et al. 2019

Separation and Purification Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Energy consumption of FILTER and CCD was calculated based on the isothermal compression process, which was typically suitable assumption for power evaluation of liquid-ring vacuum pumps. Isothermal power P T was calculated using eq . , where p out and p in are the outlet pressure and inlet pressure of the vacuum pump, respectively, atm. Normally, the discharge of the vacuum pump is assumed to be under atmospheric pressure; thus, p out = p std .…”

Section: Experiments and Modelingmentioning

confidence: 99%

“…Since P T described the ideal power, the actual power required by the vacuum pump P shaft can be calculated by dividing η T , as shown in eq , where η T set as 0.25 represents the isothermal efficiency of a vacuum pump …”

Section: Experiments and Modelingmentioning

confidence: 99%

Integrated Process of Monoethanolamine-Based CO₂ Absorption and CO₂ Mineralization with SFGD Slag: Process Simulation and Life-Cycle Assessment of CO₂ Emission

Yan

Wang

Yue

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Integrated CO 2 absorption and mineralization (IAM) is a promising approach to fix CO 2 in a far less energyintensive way. The semidry flue gas desulfurization (SFGD) slag containing a considerable amount of Ca(OH) 2 is potential for mineralizing CO 2 . In this work, an IAM process combining monoethanolamine (MEA)-based CO 2 absorption and mineralization with SFGD slag is proposed and investigated to provide a systematical evaluation of the net CO 2 fixation. A desorption efficiency of 68% and an entrainment efficiency of 32 wt % were experimentally determined. An entire IAM process model with a design specification of 8350 N m 3 /h flue gas feeding and a CO 2 fixation efficiency of 90% is simulated using Aspen Plus software. Net CO 2 fixation efficiency is analyzed through life-cycle assessment (LCA). A direct relationship between parameters and LCA of CO 2 emission is built based on parameter sensitivity analysis. The IAM process, achieving the goal of gaseous waste treatment with solid waste, shows significant environmental benefits in reducing CO 2 emission. MEA loss is the major contributor to CO 2 emission, and energy consumption follows. A net CO 2 fixation efficiency of 87.6% can be obtained with the optimized parameters. Reducing MEA loss would be effective to increase net CO 2 fixation efficiency of the whole process. This work provides a quantitative understanding of CO 2 fixation of the IAM process for industrial application and a guideline for further process optimization.

show abstract

“…The binary NRTL parameters are presented in Table S2. Distillation, condenser, and vacuum pump models were employed according to previous reports. , The simulations of PV were performed, and the effects of the operating parameters on PV were determined using a traditional model …”

Section: Experiments and Simulationmentioning

confidence: 99%

Heat-Integrated Pervaporation–Distillation Hybrid System for the Separation of Methyl Acetate–Methanol Azeotropes

Zong

Guo

Shen

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Pervaporation is typically considered an energy-efficient technology for the separation of azeotropic mixtures. However, the vaporization of the permeate leads to a temperature drop in the residual stream, and a supply of external energy is required to maintain a constant residual stream temperature in traditional pervaporation processes, which lowers their energy efficiency. Therefore, in this study, a heat-integrated pervaporation−distillation hybrid system was designed and investigated for the separation of an azeotropic MeAc−MeOH mixture using a low-temperature residual stream to cool the top vapor of the column. The temperature drop in the residual stream during pervaporation was studied using simulations and experiments. Pervaporation−distillation hybrid processes with and without heat integration were simulated and compared with special distillation under various operating parameters; their energy efficiencies were also compared. The results indicated that pervaporation−distillation with heat integration can lower the energy consumption by 24% compared to that via pressurized distillation with heat integration. Additionally, the energy efficiency increased by 31.7% compared to that by pressurized distillation with heat integration at a MeAc feed concentration of 50 wt %. The system proposed in this study is simple and practical for the energy-efficient design of pervaporation setups in industrial settings.

show abstract

Specific energy consumption of cake dewatering with vacuum filters

Cited by 23 publications

References 20 publications

Real-time monitoring of the moisture content of filter cakes in vacuum filters by a novel soft sensor

Real-time monitoring of the moisture content of filter cakes in vacuum filters by a novel soft sensor

Integrated Process of Monoethanolamine-Based CO₂ Absorption and CO₂ Mineralization with SFGD Slag: Process Simulation and Life-Cycle Assessment of CO₂ Emission

Heat-Integrated Pervaporation–Distillation Hybrid System for the Separation of Methyl Acetate–Methanol Azeotropes

Contact Info

Product

Resources

About

Specific energy consumption of cake dewatering with vacuum filters

Cited by 23 publications

References 20 publications

Real-time monitoring of the moisture content of filter cakes in vacuum filters by a novel soft sensor

Real-time monitoring of the moisture content of filter cakes in vacuum filters by a novel soft sensor

Integrated Process of Monoethanolamine-Based CO2 Absorption and CO2 Mineralization with SFGD Slag: Process Simulation and Life-Cycle Assessment of CO2 Emission

Heat-Integrated Pervaporation–Distillation Hybrid System for the Separation of Methyl Acetate–Methanol Azeotropes

Contact Info

Product

Resources

About

Integrated Process of Monoethanolamine-Based CO₂ Absorption and CO₂ Mineralization with SFGD Slag: Process Simulation and Life-Cycle Assessment of CO₂ Emission