Desulphurization Process Research Articles

Investigation on the desulphurisation process by powder injection during RH refining process of non-oriented silicon steel

In the present study, the desulphurisation process by powder injection during RH (Ruhrstahl-Heraeus) refining process was studied by establishing a kinetic model. The predicted results by the model were compared with experimental data obtained from industrial trials to verify its accuracy. The effects of the desulphuriser particle diameter, desulphuriser composition and powder injection rate on the desulphurisation process were analysed and discussed. Results show that the desulphuriser particle diameter and powder injection rate considerably affected the desulphurisation process. By decreasing the desulphuriser particle diameter and increasing the powder injection rate, the reaction area between desulphuriser particles and liquid steel considerably increased. Therefore, the desulphurisation rate and ratio increased. When the desulphuriser particle diameter decreased from 3.0 to 0.1 mm, the desulphurisation ratio increased from 44.6% to 88.4%. The ratio increased from 32.8% to 62.2% for 3.0 mm desulphuriser particles when the powder injection rate increased from 100 to 250 kg min−1. Furthermore, an increase in the desulphuriser basicity and CaO/Al2O3 ratio improved the sulphur capacity and accelerated the desulphurisation process. The desulphuriser used herein had a low sulphur partition ratio, and thus it yielded a lower desulphurisation ratio than the CaO-SiO2-Al2O3 desulphuriser.

Sheet-assembled Zn-based sorbents towards highly efficient desulfurization of hot coal gas: H2S-absorption/COS-release behavior and sulfur-release inhibiting mechanism

It is still challenging to obtain high-temperature sorbents with strong abilities of absorbing H2S and suppressing COS-release during coal-gas desulphurization process. Furthermore, the related inhibiting mechanism is unclear. Herein, functional Zn-based sorbents, with HTLCs (hydrotalcite-like compounds) as the precursor, were designed and fabricated via microwave-assisted co-precipitation method. Doping of metals (Mo/Ni/Co) with function of catalyzing COS-hydrogenolysis was proposed for sorbent modification. The resultant sorbents exhibit hierarchical structure self-assembled from nanosheets. As expected, Mo-, Ni-, and Co-doping result in significant decrease (by 78 %–85 %, 83 %–90 %, and 59 %–74 %, respectively) in the amount of released COS for sorbents. Moreover, Ni-doping generally causes the smallest negative effect on H2S-uptake behavior. It is related to a decline (by about 40 %) in the length of laminas unit and more porous structure of sorbents because of Ni-doping. Especially, the sorbent with the lowest Ni-doping ratio shows high sulfur capacity (27.1 g S/100 g sorbent, desulfurization efficiency: > 99.5 %) and low COS-release amount (1.5 × 10−3 g COS/100 g sorbent). More importantly, it also maintains relatively stable performance over successive sulfidation-regeneration cycles. In addition, the analysis of COS-hydrogenation behavior over individual components in desulfurizers reveals that the doped metals greatly accelerate the COS-hydrogenolysis reaction, responsible for less COS emission of modified sorbents.

Electrochemical performance of chemically treated pyrolytic carbon black from waste car tyres

Pyrolytic carbon black (CBp) is a solid by-product of tyre pyrolysis that contains various contaminants from the tyre additives. These contaminants limit the use of CBp as a carbon source for energy storage applications such as supercapacitors. This study aims to improve the physicochemical, morphological, and electrochemical properties of CBp by applying different chemical treatments and activation methods. The chemical treatments include acid (HCl), base (NaOH), acid-base (HCl/NaOH), and desulphurization (NaOH in xylene) processes to remove impurities such as sulphur, zinc, and silicon. The treated CBp samples are then activated by KOH impregnation technique to increase the surface area and porosity. The characterizations of the treated CBp samples are performed using Scanning Electron Microscopy (SEM) with Energy Dispersive Spectroscopy (EDX), X-ray Diffraction (XRD), and Brunner Emmett Teller (BET). The electrochemical performance of the treated CBp samples are evaluated using galvanostatic charge-discharge (GCD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results show that the chemical treatments significantly reduce the impurity levels and enhance the electrochemical performance of CBp. The desulphurized CBp sample exhibits the highest specific capacitance of 218 F/g among the treated CBp samples. The findings of this study suggest that CBp can be effectively utilized as a potential carbon source for supercapacitor electrodes by applying suitable chemical treatments and activation methods. This will create a circular economy to valorize CBp.

Preparation and stability of zinc‐based mesoporous sorbent modified with aluminium for high temperature coal gas desulphurization

AbstractZinc‐based sorbents with ordered mesoporous structure were modified with aluminium and the key factors in the preparation were optimized based on the results of desulphurization tests performed in a fixed‐bed reactor with simulated coal gas. It was shown that the sorbents for hydrogen sulphide removal reached an optimum sulphur capacity of 9.14% when prepared under conditions of 10.0 crystalline pH, 30:1 Si:Al molar ratio, 0.32:1 Zn:Si molar ratio, and 1:3 Zn:TAA molar ratio. The sorbent without aluminium was synthesized synchronously as a comparison sample to investigate the effect of aluminium addition on the desulphurization properties. The surface acidity of the sorbents is enhanced by the addition of aluminium, and the sulphur capacity of the aluminium‐doped sorbent is consequently lower compared to that of aluminium‐free sorbent. Nevertheless, the aluminium‐doped sorbent shows a significant advantage in stability of performance over multiple desulphurization–regeneration cycles and reaches an 81% retention rate of sulphur capacity after five desulphurization, while the aluminium‐free sorbent is only 51% in contrast. The characterization results manifest that aluminium enters the carrier skeleton and increases the wall thickness, which alleviates the collapse of the carrier pore channels and the agglomeration of the active components during the desulphurization process. Stable pore structures and highly dispersed active components facilitate the mass transfer in the reaction process after multiple desulphurization. As a result, the aluminium‐doped sorbent exhibits better performance stability in high temperature coal gas desulphurization.

Numerical simulation of particle erosion coupled with flue gas desulphurization in the spouted bed

The addition of an axial swirl vane (ASV) and multi-jet distributor plate (MDP) to a conventional spouted bed (CSB) to form an integrated multi-jet swirling spouted bed (IMSSB) combined with internally reinforced components not only optimized its desulphurization efficiency but also exacerbated the erosion of particles on the bed and the internal components. Coupled study of the particle erosion and desulphurization reaction in the flue gas desulphurization process of an IMSSB was carried out based on the CPFD numerical simulation. The results show that: the desulfurization efficiency of IMSSB is increased by 16.6% compared with that of the CSB; in terms of wall erosion, the maximum erosion rate in IMSSB is about four times that of CSB; the erosion condition increases in the vane from the center to the edges; particle erosion is most severe in the fountain area.

Understanding the pore size distribution of Ca(OH)2 for effective desulfurization under low-to-medium temperatures

The pore size distribution plays a crucial role in the gas-solid desulfurization reaction of Ca(OH)2, yet its impact on desulfurization performance is not fully understood, especially in low-to-medium temperature range (100–400 °C). This study examined the diffusion and adsorption characteristics of SO2 in Ca(OH)2 pores with different sizes by Monte Carlo Simulation and Molecular Dynamics Methods. The reaction kinetics of desulfurization for samples with different pore structures were analyzed based on TGA data and linear regression. It is found that the adsorption of SO2 on Ca(OH)2 was mainly induced by electrostatic interaction. Pores with the size of 5–15 nm were most favorable for SO2 adsorption, with the maximum adsorption heat of 464.83 kJ/mol at 5 nm. When the pore size increased, the diffusion of SO2 was improved, but the distribution of SO2 became more scattered, resulting in an adverse effect on the desulphurization reaction. The desulphurization process can be divided into the surface reaction controlled stage and product layer diffusion controlled stage. The desulphurization ability was primarily contributed by the reaction controlled stage, in which Ca2+ migration resistance was the least. Pore structure was a crucial factor in determining the duration of the reaction controlled stage. The presence of 15–30 nm pores was of significant importance for this stage. Yet in the diffusion controlled stage, pores size of ≥30 nm was much more important than other sizes to improve the Ca2+ diffusion. This study shows that a reasonable pore size combination facilitates the diffusion of SO2 and its reaction with Ca2+.

Performance of a novel cobalt phthalocyanine sulfonamide‐based catalyst for oxidative desulphurization of gas condensate

AbstractSulphur compounds and mercaptans in gas condensate cause corrosion problems, poison catalysts in catalytic processes, and have adverse environmental impact through SOx emission upon combustion. Therefore, it is essential to remove sulphur and mercaptan from gas condensate to standard levels. In this study, the oxidative desulphurization (ODS) process in the presence of a cobalt phthalocyanine sulfonamide‐based catalyst was investigated. The homogeneous catalyst containing 23 wt.% active material was used and optimum operating conditions of temperature, volume ratio of caustic to gas condensate, caustic concentration, and solvent amount were determined to decrease sulphur content to less than 500 ppm and mercaptan to less than 200 ppm. The catalyst consumption in all experiments was kept constant at a minimum level (0.01 g/400 mL gas condensate). Results showed that this catalyst improved the reaction rate in the lower temperature and lower caustic to feed ratio and lower caustic concentration. The maximum sulphur removal was obtained at 5°C and 4 vol.% of caustic to gas condensate ratio at 16.7 wt.% of caustic concentration. Moreover, this catalyst improved sulphur removal from the gas condensate to about 5% compared to caustic sweeting without catalyst. Sulphur compounds had higher solubility in acetone rather than methanol, and sulphur removal by acetone was 96% while it was 91% for methanol. Finally, the economical and acceptable solvent for sulfoxides removal was methanol with 5% volume fraction.

CFD Simulation on The Effect of Impeller Immersion Depth and Impeller Rotational Speed on The Flow Pattern and Temperature Drop of Molten Ferronickel During Desulphurization Process

Desulphurization is the purifying process of molten ferronickel from sulphur impurity. During the desulphurization process using a ladle furnace equipped with an impeller, the fluid flow characteristics and the temperature drop of molten ferronickel are important things that must be observed. One approach that can be done to find out the fluid flow characteristics and temperature drops is through Computational Fluid Dynamics (CFD) simulation. The limitation of the simulation in the previous study did not simulate the effect of operating parameters such as impeller immersion depth and impeller rotational speed on the temperature drop of molten metal. Therefore, the simulation carried out in this study was a CFD simulation on the effect of impeller immersion depth and impeller rotational speed on the temperature drop of molten ferronickel during the desulphurization process. This study began by comparing the initial simulation results with a prototype experiment and simulation that another researcher conducted to validate the simulation model. After the selected model had been validated, the main simulations were carried out with variations in the immersion depth and impeller rotation speed. Variations in impeller immersion depth were 700 mm and 900 mm, while variations in impeller rotational speed were 30 rpm, 40 rpm, 50 rpm, and 60 rpm. The simulation began with creating a 3D design of an impeller and 2236 mm high ladle furnace using Ansys SpaceClaim. Then, the meshing and setup process was carried out using Ansys Fluent. The simulation was set by activating the Volume of the Fluid model, the Multiple Reference Frame model, the energy model, and the Renormalization Group (RNG) k-ɛ turbulent model. Based on the simulation results, the impeller immersion depth affects the size of the recirculation flow pattern and the characteristics of the molten ferronickel temperature profile. The impeller rotational speed affects molten ferronickel's vortex depth, velocity, and temperature drop. If the impeller is immersed deeper, the upper recirculation zone will be larger than the lower recirculation zone and the molten ferronickel temperature in the upper area will be hotter, while the bottom area will be colder. The faster the rotation of the impeller is the deeper the vortex, the higher the velocity of molten ferronickel, and the greater the temperature drop of molten ferronickel. The desulfurization process is influenced by a combination of mechanical operating parameters, such as the depth of immersion and impeller rotational speed, which result in ideal mixing characteristics. Impeller immersion depth of 900 mm and impeller rotational speed of 50 rpm are the ideal operational parameters for the desulfurization process in this study. A more uniform distribution of temperature profiles in the ladle's top and lower zones is produced by this parameter. There is slight difference in the size of the upper and lower recirculation flow zones when the impeller immersion depth is 900 mm. With an impeller rotating at 50 rpm, there is a temperature decrease of roughly 24 °C and a vortex depth that is almost at the top of the impeller.

Developing microfluidic purification techniques for biodiesel production from recycled grease trap waste

This study aimed to investigate the desulphurisation process of model biodiesel containing thiophene (Th) using 5 different solvents (sulfolane, ionic liquids (ILs) - [BMIM]AlCl4, [BMIM]MSA, and deep eutectic solvents (DESs)...

Quantum chemistry and kinetics of hydrogen sulphide oxidation.

A fundamental understanding of the acid gas (H2S and CO2) chemistry is key to efficiently implement the desulphurisation process and even the production of clean fuels such as hydrogen or syngas. In this work, we developed a new kinetic model for the pyrolysis and oxidation of hydrogen sulphide by merging two previously reported models with the goal of covering a wider range of conditions and including the effect of carbon dioxide. The resulting model, which consists of 75 species and 514 reactions, was used to conduct rate of production and sensitivity analysis in plug flow reactor simulations, and the results were used to determine the most prominent reactions in which hydrogen sulphide, molecular hydrogen, and sulphur monoxide are involved. The resulting list of important reactions was screened and the kinetics of three of them, i.e., SO2 + S2 → S2O + SO, S2O + S2 → S3 + SO, and SO + SH → S2 + OH, was found to warrant further investigation. With the goal of improving the accurancy of our new kinetic model, we carried out a robust quantum chemistry and Rice-Ramsperger-Kassel-Marcus master equation study to obtain, for the first time, the forward and reverse rate constants for those three reactions at temperatures and pressures of interest for combustion and atmospheric chemistry. This work is the first step of a kinetic study that is aimed at improving the understanding of the chemistry of the pyrolysis and oxidation of H2S, highlighting the importance of sulphur-sulphur interactions and providing a fundamental basis for future kinetic models of H2S not only in the field of combustion, but also in atmospheric chemistry.

Flue Gas Desulfurization Scrubbers in Heavy Diesel Combustion Plants

Through the purification technology of flue gas desulfurization, ultralow emissions of SO2 flue gas in industrial flue gas can be achieved. In this article, wet flue gas desulphurization (FGD) processes using limestone (calcium carbonate CaCO3) and caustic (sodium hydroxide NaOH) as absorption solution are introduced in terms of fluid mechanics and mass transfer phenomena as well as absorption unit processes. Also initial investment and operation costs are compared for wet flue gas desulphurization processes using limestone and and caustic.

Effect of Variable Synthesis Conditions on the Formation of Ye'elimite-Aluminate-Calcium (YAC) Cement and Its Hydration in the Presence of Portland Cement (OPC) and Several Accessory Additives.

In the presented study, ye'elimite-aluminate-calcium (YAC) cement was synthesized. Complete synthesis of crystalline phases was achieved at a temperature of 1300 °C, which is 150 °C lower than the temperature standardly used in the processes of obtaining calcium aluminate cements (CAC). The greatest amount of ye'elimite phase (Klein complex), roughly 87% by mass, was acquired utilizing a sulphur ion transporter derived from artificial dihydrate gypsum obtained in the flue gas desulphurization process (variation I). In the case of anhydrite, the amount of synthesized crystalline ye'elimite in the clinker was 67% by weight (variant II). Depending on the synthesis conditions in the clinkers, the quantity of obtained calcium aluminates (C12A7, CA, and CA2) ranged from 20 to 40% by weight. Studies on the hydration process of YAC cement samples showed that the main products are hydrated calcium aluminates and dodecahydrate calcium alumino-sulphate. In sinters of YAC and OPC, no crystalline ettringite was observed. Hydration analysis of Chinese cement revealed the presence of crystalline ettringite and dodecahydrate calcium alumino-sulphate, as well as hydrated calcium silicates of the CSH type accompanied with pseudo-crystalline Al(OH)3. The obtained clinkers from variants I and II constitute a special binder, which, due to its phase composition after hydration, can be used in the construction of reactors for biogas production in eco-energy applications.

Adsorptive desulfurization of thiophene using Cu-CNF slurry in a coiled flow inverter with recycling

This study presents an alternative to adsorptive desulphurization (ADS) process in packed beds by making use of enhanced radial mixing prevalent in coiled flow inverter (CFI). We describe the synthesis of Cu-tartrate as the precursor for Cu-carbon nanofiber (Cu-CNF) and the application thereof in ADS of liquid fuels in a CFI. Thiophene was removed from n-hexane using a slurry of Cu-CNF in the liquid. The data show the sulfur (S) - loading of 103 mg/g in Cu-CNF at 2000 ppmw-S concentration of thiophene in the liquid at 120 cc/min flowrate using five CFI units connected in series. Recycling was introduced for the first time in CFI, and three CFI units connected in series with the recycle ratio of 2 were sufficient to achieve the same removal efficiency as with five CFI without recycling. The results indicate that CFI is an efficient technology and has potential to replace packed bed adsorbers.

Stacked Spatial–Temporal Autoencoder for Quality Prediction in Industrial Processes

Nowadays, data-driven soft sensors have become a mainstream for the key performance indicators prediction, which guarantees the safety and stability of the industrial process. The typical autoencoder (AE) has been widely used to extract potential features through unsupervised pretraining and supervised fine-tuning. However, most existing studies fail to consider both the time-varying features of the process and the differences in the contributions of the hidden features to the target variable. Therefore, in this paper, a stacked spatial-temporal autoencoder (S <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> TAE) is proposed to enhance the representation learning capability for soft sensor modeling by taking the spatial-temporal correlations into consideration. Specifically, in order to effectively model the temporal dependence from nearby times, a temporal autoencoder (TAE) is proposed, in which a memory module is devised and integrated to learn valuable historical information. Moreover, a “feature recalibration” block is developed and embedded into the spatial-temporal autoencoder (STAE) to selectively capture more informative features and suppress the less useful ones in a supervised way. Then, multiple STAEs are stacked to construct the S <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> TAE network to extract more robust high-level features. Finally, the experimental results on two real-world datasets of an SDS desulphurization process and a high–low transformer demonstrate that the S <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> TAE-based soft sensor is effective and feasible.

Utilization of Welding Electrode Waste To Purify Biogas From Hydrogen Sulfide Impurities

&lt;p&gt;Abstract— The biogas desulphurization process has a crucial role in the widespread use of biogas due to the toxic and corrosive nature of the element hydrogen sulfide on equipment. This study investigated the potential use of waste welding electrodes as a biogas purification medium. Variables in the form of feed biogas flow rates of 1, 2, and 3 liters/minute were studied for their effects. As a result, the most optimum performance was obtained in the test with a feed biogas flow rate of 1 liter/minute, with an average reduction percentage of hydrogen sulfide content in the biogas of 27.12%.&lt;/p&gt;&lt;script id="stacks-wallet-provider" type="text/javascript" src="chrome-extension://ldinpeekobnhjjdofggfgjlcehhmanlj/inpage.js"&gt;&lt;/script&gt;

Oxidation of Sulphur pollutants in model and real fuels using hydrodynamic cavitation

Hydrodynamic Cavitation (HC) offers an attractive platform for intensifying oxidative desulphurization of fuels. In the first part of this work, we present new results on oxidising single ring thiophene in a model fuel over the extended range of volume fraction of organic phase from 2.5 to 80 v/v %. We also present influence of type and scale of HC device on performance of oxidative desulphurization. Further experiments revealed that oxidising radicals generated in-situ by HC alone were not able to oxidise dual ring thiophenes. External catalyst (formic acid) and oxidising agents (hydrogen peroxide, H2O2) were therefore used with HC. Based on our prior work with acoustic cavitation (AC), the volumetric ratios for H2O2 and formic acid were identified as 0.95 v/v % and 6.25 v/v % respectively. The data of oxidation of dual ring thiophenes with n-dodecane and n-hexane as model fuels and typical transport fuels (diesel, kerosene, and petrol) using these oxidant and catalyst is presented. The observed performance with HC was compared with results obtained from a stirred tank and AC set-up. The presented data indicates that HC is able to intensify oxidation of sulphur species. The presented results provide a sound basis for further developments on HC based oxidative desulphurization processes.

Optimization of the Oxidative Desulphurization of Residual Oil Using Hydrogen Peroxide

The role of fuel in global economy cannot be overemphasized, it is necessary to develop new and more efficient technologies in desulphurization processes at a low cost. This research focuses on optimization of desulphurization using oxidative method for higher yields, utilizing dual acetic/formic acid catalyst on residual oil with sulphur concentration > 0.50%wt and emphasizes the improvement of physicochemical properties primarily suitable for use in fuels where regulation is becoming more stringent. The process was conducted using H₂O₂ oxidant concentration 12.5-25.0% (w/w), CH₃COOH/HCOOH acid catalyst mixture 12.5-22.0% (w/w), and reaction temperature 40-60°C. Optimization of the desulphurization parameters was done using response surface methodology based on Box-Behnken design. The optimum yield of desulphurization (60.93%) was achieved at the oxidant 18.75% (w/w), acetic/formic mixture of 17.25% (w/w), and reaction temperature of 50°C. In general, the experimentally confirmatory figures in two solutions of 63.29 ± 0.47% and 61.04 ± 0.13% match the predicted values of 62.82% and 60.91%, respectively. The total sulphur content in residual oil was reduced from 0.67 to 0.26%wt. GC-MS of the untreated sample confirm the presence of 1,2-benzisothiazole,3-(hexahydro-1H-azepin-1-yl)-1,1-dioxide, Nickel(II)bis(N,N-dihexyldithiocarbamate and Diethyl[3-[n-octadecylmercapto]-P-n-butyl-anilino methy lene] malonate with a total percentage peak area of 11.83%. In the treated sample shows no sulphur compounds. The physicochemical analysis for both treated and untreated residual oil according to ASTM were found to be within acceptable limit except sulphur content of untreated sample. After the desulphurization, treated residual oil shows a remarkable improvement in the physicochemical parameters. Hence can be applicable in industrial process and automobiles with very low sulphur emission.

Simulation analysis of gas–solid flow characteristics and water evaporation in flue gas semi‐dry desulphurization process based on CPFD method

AbstractThe gas–solids flow in an industrial‐scale semi‐dry method desulphurization tower is simulated by the computational particle fluid dynamics (CPFD) approach. Compared with previous studies on desulphurization towers, this study focuses on analyzing particle distribution characteristics such as particle volume fraction, temperature distribution, and residence time. The simulation fully considered the particle–fluid, particle–particle, and particle–wall interactions in the desulphurization tower. Based on these considerations, the effects of flue gas inlet velocity and temperature on the gas–solid distribution characteristics of the desulphurization tower are simulated. An optimization scheme for adjusting the gas–solid flow in the desulphurization tower is proposed. The research results show that the error between the CPFD simulation data and experimental data is small and the changing trend is consistent. The particles in the bed of the desulphurization tower show a typical core–annulus flow. The distribution of gas and particles in the bed has a serious deviation with the increase of the flue gas inlet velocity and temperature. As the axial height of the desulphurization tower increases, the flue gas velocity, temperature, particle concentration, and water vapour distribution in the bed become more uniform. The relatively stable operating conditions for the gas–solid flow in the desulphurization tower is that the flue gas inlet velocity and temperature are 15 m/s and 393 K, respectively. Under these operating conditions, the pressure loss caused by the venturi accounted for 73.6% of the total pressure loss of the desulphurization tower. When the particle radius is between 0–150 μm, the particle size and the flue gas inlet velocity have the greatest influence on the particle residence time. Finally, the distribution of gas and particles before and after the adjustment of the desulphurization tower is compared, which showed that adjusting the bottom structure of the desulphurization tower could optimize the gas–solid flow.

DEVELOPMENT OF A BASIC TECHNOLOGICAL SCHEME FOR THE PROCESS OF ADSORPTION DESULPHURIZATION OF GASOLINE FRACTION USING SILICA GEL MODIFIED WITH ZINC(II) PIVALATE

The paper presents the results of a theoretical and experimental study of the effectiveness of adsorption desulfurization of hydrocarbon motor fuels using silica gel modified with zinc(II) pivalate. The expediency of using powdered silica gel in the process of removing toxic and highly corrosive hydrogen sulfide and thiols are shown. Based on the effective parameters of adsorptive desulphurization established in laboratory conditions, a schematic process flow diagram for the process of removing acidic sulfur compounds from the gasoline fraction at a temperature of 25 ℃ and a pressure close to atmospheric are proposed. The possibility of solvent regeneration of the saturated adsorbent of the desulfurization process at a temperature of 25 ℃ and a pressure close to atmospheric are shown. The most effective solvent for the regeneration process is isopropyl alcohol. To maintain the activity and stability of the adsorbent during the desulphurization process, the technological scheme provides for ultrasonic feeding of the regenerated adsorbent with a saturated solution of the modifier, followed by drying with fuel gas. The recovery of isopropyl alcohol after washing the saturated adsorbent is carried out by distillation at a temperature of 90 ℃ and a pressure close to atmospheric. Technology based on adsorption by a scavenger consisting of a carrier and a polynuclear carboxylate complex of transition metal allows the removal of sulfur-containing compounds directly in the feed stream. A reactor with a suspension adsorbent bed is proposed as the main apparatus for the process of adsorption desulphurization. The process of washing and separating the suspension of adsorbent and fuel takes place in drum vacuum filters. The concentrate of sulfur compounds obtained during the purification process can be used as a feedstock in chemical and petrochemical processes in order to obtain practically important sulfur-containing compounds. For citation: Kamyshnikova A.S., Okhlobystin A.O., Karatun O.N., Storozhenko V.N., Zorina-Tikhonova E.N., Berberova N.T. Development of a basic technological scheme for the process of adsorption desulphurization of gasoline fraction using silica gel modified with zinc(II) pivalate. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2023. V. 66. N 2. P. 92-99. DOI: 10.6060/ivkkt.20236602.6705.

Flexible Control of Wet Desulphurization Process Based on Frequency Retrofit

To assist in the absorption of renewable energy, coal-fired power plants need to operate over a wide range of loads, which exacerbates the challenge of the time delay in the wet desulphurization process. Therefore, this paper proposes a new control structure based on frequency retrofit and a corresponding model predictive controller to change the traditional idea of wet desulphurization control. This structure provides faster control actions, thus reducing time delay directly. And it makes the original discrete control variable continuous, enabling most control methods. The field application to the wet flue gas desulphurization system reveals the practical prospects of the proposed control structure and simulations have been conducted to verify the merits of the proposed control scheme based on data collected from a 1000 MW power plant.