Employing a step-wise titration method under semi-slow reaction regime for evaluating the reactivity of limestone and dolomite in acidic environment

Blasio, Cataldo De; Carletti, Claudio; Lundell, Andreas; Visuri, Ville‐Valtteri; Kokkonen, Tommi; Westerlund, Tapio; Fabritius, Timo; Järvinen, Mika

doi:10.1016/j.mineng.2015.11.011

Cited by 10 publications

(7 citation statements)

References 46 publications

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“…The slurry pH is a key parameter of the wet desulfurization system, which may significantly affect the safety and desulfurization efficiency of the WFGD system 17 . Studies showed that the optimal pH of slurry in WFGD systems was in the range of 5.0–6.0 18 .…”

Section: Resultsmentioning

confidence: 99%

Operation optimization and costs analysis of the wet desulfurization system in an ultra‐supercritical coal‐fired power plants

Wang

Luo

et al. 2020

Env Prog and Sustain Energy

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With the increasingly strict requirements on energy saving and environmental protection, the economical, efficient and environment friendly operation of large coal‐fired units are being more and more critical. In light of the technical problems of massive energy consumption and high cost in the operation of the wet desulfurization system in a 1,000 MW ultra‐supercritical boiler, the effects of slurry circulation pump combination, slurry pH and absorption tower liquid level on desulfurization efficiency under different unit loads were tested, and the total operating costs were calculated. The results showed that the power consumption under different conditions could be greatly reduced by changing the combination of slurry circulation pumps. The power cost increases from 1,059.42 to 1,146.99 yuan/hr as the combination of slurry circulation pump changes from AC pump combination to BD pump combination under 1,000 MW, increased by 7.63%. Considering all factors, the combination of BC circulating pump can effectively reduce the power consumption cost and achieve the optimal economical operation under the load of 1,000 and 750 MW. The desulfurization efficiency is in direct proportion to the increase of slurry pH. The optimal pH of slurry under 1,000 MW is in the range of 5.50–5.60, 4.80–4.90 under 750 MW, and 4.50–4.60 under 500 MW. Besides, the absorption tower liquid level has a significant impact on the energy consumption of desulfurization system. With the decrease of the absorption tower liquid level, the power consumption cost of desulfurization system shows a downward trend. To avoid the frequent adjustment of liquid level which may result in safety accidents, the optimal liquid level of absorption tower is maintained at 8.00–9.00 m under different unit loads. The research results can provide significant guidance for the operation optimization and fine management of the desulfurization system of the same type.

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Section: Resultsmentioning

confidence: 99%

Operation optimization and costs analysis of the wet desulfurization system in an ultra‐supercritical coal‐fired power plants

Wang

Luo

et al. 2020

Env Prog and Sustain Energy

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“…In case the mass balance is well described by ordinary differential equations and there are parameters describing, for instance, the mass transfer coefficient and the diffusivity of the dissolving element, those parameters could be evaluated by implementing a software procedure to obtain a suitable regression coefficient, and their value could be obtained by an iterative method. One example is the Levenberg-Marquardt method [10]. However, if experimental data are available on the dissolved concentrations vs. time and diverse models are tested to find the correct value of the transport parameters, there will be a major difference in computational time if numerical methods are implemented.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Limestone Dissolution for Flue Gas Desulfurization with Novel Implications

et al. 2020

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Solid-liquid dissolution is a central step in many industrial applications such as pharmaceutical, process engineering, and pollution control. Accurate mathematical models are proposed to improve reactor design and process operations. Analytical methods are significantly beneficial in the case of iterative methods used within experimental investigations. In the present study, a detailed analytical solution for the general case of solid particles dissolving in multiphase chemical reaction systems is presented. In this model, the authors consider a formulation that considers the particles’ shape factor. The general case presented could be utilized within different problems of multiphase flows. These methods could be extended to different cases within the chemical engineering area. Examples are illustrated here in relation to limestone dissolution taking place within the Wet Flue Gas Desulfurization process, where calcium carbonate is dissolving in an acidic environment. The method is the most common used technology to abate SO2 released by fuel combustion. Limestone dissolution plays a major role in the process. Nevertheless, there is a need for improvements in the optimization of the WFGD process for scale-up purposes. The mathematical model has been tested by comparison with experimental data from several mild acidic dissolution assays of sedimentary and metamorphic limestone. We have found that R2 ⊂ 0.92 ± 0.06 from dozens of experiments. This fact verifies the model qualifications in capturing the main drivers of the system.

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“…For instance, in some regions of China, there are types of coal which could contain over 10 wt% of the mentioned compound. This kind of coal is considered to have a Superhigh-Organic Sulfur content [2].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, models were provided for limestone dissolution from a plane surface [16] or from rotating cylinders [20]. Considering that, instead, particles suspended under mechanical agitation can dissolve in acidic slurries at constant or varying pH values [2,21]. In each of these systems, approximations are necessary in order to obtain analytical or numerical solutions to the problem at hand.…”

Section: Introductionmentioning

confidence: 99%

“…An approximation in this sense is to consider a particle as "pure" or "not pure", and this will allow for considering the particle as a Bernoulli random variable. In case the amount of impurities is known, then the number of particles required to obtain the wanted confidence interval on that proportion of impure sample can be calculated by an approximated statistical method [2].…”

Section: Introductionmentioning

confidence: 99%

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Ultrasonic Power to Enhance Limestone Dissolution in the Wet Flue Gas Desulfurization Process. Modeling and Results from Stepwise Titration Experiments

et al. 2018

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The goal of this work is to assess the application of ultrasonic power to the reactive dissolution of limestone particles in an acidic environment; this would represent a novel method for improving wet Flue Gas Desulfurization industrial systems. In this study a stepwise titration method is utilized; experiments were done by using different particle size distributions with and without the application of ultrasound. The use of ultrasonic power sensibly affected the reaction rate of limestone and its dissolution; a major difference could be observed when samples from the Wolica region in Poland were studied. In this case, the overall dissolution rate was found to increase by more than 70%. The reactive dissolution of limestone does not follow the same mathematical model when sonication is in effect; in this case, an extra Ultrasonic Enhancement Constant was introduced. It was demonstrated that the dissolution is proportional to an Effective Reaction Surface and, therefore, surface interactions should also be taken into consideration. For this purpose, a study is presented here on the Z-potential and electrophoretic mobility of limestone samples measured in aqueous dispersions by means of Laser Doppler Micro-Electrophoresis.

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Employing a step-wise titration method under semi-slow reaction regime for evaluating the reactivity of limestone and dolomite in acidic environment

Cited by 10 publications

References 46 publications

Operation optimization and costs analysis of the wet desulfurization system in an ultra‐supercritical coal‐fired power plants

Operation optimization and costs analysis of the wet desulfurization system in an ultra‐supercritical coal‐fired power plants

Modeling of Limestone Dissolution for Flue Gas Desulfurization with Novel Implications

Ultrasonic Power to Enhance Limestone Dissolution in the Wet Flue Gas Desulfurization Process. Modeling and Results from Stepwise Titration Experiments

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