Model-Free Adaptive Control of pH Value of Wet Desulfurization Slurry

In limestone-gypsum wet flue gas desulfurization process, the change process of pH value of slurry in absorption tower is a typical nonlinear system with time delay and various uncertainties, so ...

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Advanced Process Control for Optimizing Flue Gas …

Coal-fired power plants can significantly improve wet limestone scrubbing with advanced process control. One optimization system implemented at a Japanese facility utilized enhanced regulatory ...

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CN101190399A

The invention discloses a process applied to a magnesia slurry method desulfurization system for removing SO2 in coal flue gas and the device thereof. The system mainly comprises a flue gas system, a slurry preparation system, a desulfurization system, an exhaustion system, etc. The main equipment of the desulfurization system is a spraying tower; the prepared MgO serum …

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Recent advances in process and materials for dry desulfurization …

Currently, desulfurization technologies can be categorized into three main types: wet flue gas desulfurization (FGD) [11], [12], [13], semi-dry desulfurization [14] and dry desulfurization [15].Wet flue gas desulfurization is widely employed in large-scale desulfurization processes due to its high efficiency and low energy consumption [16].However, it poses a …

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Atomization and desulfurization characteristics of limestone slurry …

Desulfurization slurry has characteristics such as sizeable solid particle size, high particle content, and elevated liquid viscosity, all of which significantly influence the atomization and breakup dynamics crucial for enhancing desulfurization efficiency. ... Simultaneously, the visualization system recorded the EHDA process of the slurry ...

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Optimization of Limestone-gypsum Wet Flue Gas …

slurry and process water are made: the PH and densimeter are placed at the outlet of the recycled pump tube, it could make the discharged pump stop operating when gypsum are not draint. ... Desulfurization system is the fourth main system for power plants.So some

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Coal-Fired Boiler Flue Gas Desulfurization System Based on …

desulfurization system is negatively correlated with outdoor wind speed and heat dissipation area, and positively related to ambient temperature. The slurry temperature is the main factor that affects the performance of the wet flue gas desulfurization system. Finally, based on …

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Spray Dry Flue Gas Desulfurization Systems

gas desulfurization (FGD) systems for controlling SO 2 emissions. Our first coal-fired spray dryer absorber (SDA) installations now have more than 35 years of operating history. We are the exclusive North American licensee of GEA Process Engineering A/S, Denmark, for the GEA Niro SDA process. The two companies also work together worldwide on

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A novel monitoring framework for slurry deterioration detection in …

Healthy gypsum slurry is the foundation of continuous and stable operation during wet flue gas desulfurization process, but there is relatively little research on it. In the paper, a compound parameter is proposed to remove the influences from gas volume and inlet sulfur dioxide concentration to limestone slurry flow.

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Numerical investigation on distribution characteristics of oxidation

Numerical investigation on distribution characteristics of oxidation air in a lime slurry desulfurization system with rotary jet agitators. Author links open overlay panel Longhao Xiang a b, Xun Sun a b, Xuesong Wei a b, ... and the optimal desulfurization process parameters for the operation of desulfurization technology are obtained. A high ...

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Limestone-Gypsum FGD Wet Desulphurization

The limestone-gypsum wet desulfurization system includes the following systems: limestone feeding and slurry preparation system, flue gas system, absorption tower system and oxidizing air system, gypsum dehydration and wastewater system, process water system, electrical and thermal control system. Part3 3. Technological Advantages

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Analytical Investigation and Design of Flue Gas …

control systems, the terms FGD came into consideration. FGD systems are also used to reduce SO 2 emissions from process plants such as smelters, acid plants, refineries, and pulp and paper mills. FGD systems can be categorized as dry or wet. In wet FGD scrubbing systems, the scrubbing liquid contains an alkali reagent

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Experimental Study on the Erosion–Corrosion Characteristics of

During the flow and heat transfer process of desulfurization slurry, except for corrosion, the erosion effect also exists and probably presents an interaction effect with corrosion and/or other electrochemical processes. Zhang et al. 16 investigated the wear and corrosion behaviors of type 1045 and 2205 stainless steel. They indicated that the ...

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Causes and treatments of ing and overflow of calcium-based …

During the operation of the calcium-based wet desulfurization system, slurry ing and overflow are prone to occur, which is not conducive to the safe and stable operation of the desulfurization ...

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Hybrid modeling and operating optimization method of oxidation process

Wet flue gas desulfurization systems (WFGD) are the most popular method to remove the SO 2 from the flue gas in China's power plants. Most WFGD systems contain an oxidation subsystem, which is one of the most important subsystems. ... In order to modify and verify the hybrid model of oxidation process as mentioned above, the slurry in the ...

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Flue Gas Desulphuriser Explained

Flue gas desulphurisation (FGD) describes a process that removes sulphur dioxide (SO2) from a flue gas (exhaust gas) stream. Sulphur dioxide is released to the atmosphere when fossil fuels are burnt and it is a leading contributor to …

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Flue Gas Desulfurization Systems

The limestone slurry absorbs the sulfur dioxide (SO 2) contained in the flue gas reducing the emission of sulfur. The limestone reacts with the SO 2 to produce calcium sulfite. The calcium sulfite then reacts with oxygen and is then finally …

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Control-oriented dynamic modeling and GPC for single-tower …

The desulfurization system, as one of the main auxiliary facilities in coal-fired power plants, ... the DSC+GPC control strategy exhibits smaller overshoot and shorter adjustment time in the regulation process of absorber slurry pH value and AFT slurry pH value compared to GPC and PID control strategies. Given the excellent predictive ...

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Desulfurization characteristics of limestone slurry with added …

A desulfurization reaction was performed in bubbling reactor to investigate the effect of six different organic acid additives on improving desulfurization in the limestone slurry. …

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Flue Gas Desulfurization Systems

The limestone slurry absorbs the sulfur dioxide (SO 2) contained in the flue gas reducing the emission of sulfur. The limestone reacts with the SO 2 to produce calcium sulfite. The calcium sulfite then reacts with oxygen and is then finally removed as gypsum. The limestone slurry and gypsum slurry are very abrasive.

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FLUE GAS DESULFURIZATION

Once inside the absorber tower, the gas flows upwards through a dense shower of lime or limestone slurry. The slurry absorbs the Sulfur Dioxide (SO2) in the flue gas. The absorption …

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A novel monitoring framework for slurry deterioration detection in …

Actually, desulfurization system with healthy slurry works as the premise of performance analysis and optimization in WFGD system. ... In addition, the controlling process on slurry pH value and the amount of oxidized air can cause the chemical reaction to proceed in the positive direction. Download: ...

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Modeling and optimization of wet flue gas desulfurization system …

The exhaust gas comes into mass transfer and chemical reactions in countercurrent mode with the limestone slurry droplets, which are introduced through injection nozzles of three to five spray stages in the higher part of the tower. ... Simulation of the operation of an industrial wet flue gas desulfurization system. Fuel Process. Technol. 91 ...

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Experimental study on desulfurization efficiency and gas–liquid …

The desulfurization efficiency and gas–liquid mass transfer are main factors to determine the performance of WFGD system. In WFGD process, controlling process of mass transfer and chemical reactions occur in a reactor vessel simultaneously [29], [30], [31], [32].The objective of this paper is focusing on research of the complicated gas–liquid transfer process …

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Flue Gas Desulfurization: Detailed Process Overview

The flue gas desulfurization system is based on the absorption of SO2 from the flue gas into a limestone slurry. Captured SO 2 is subsequently converted to solid gypsum, a saleable byproduct, and removed from the system.

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Enhancing deep learning for the comprehensive forecast model in …

The sulfur dioxide (SO 2) emissions contribute to severe environmental pollution and respiratory problems, which make the limestone–gypsum wet flue gas desulfurization (WFGD) an increasingly important issue. The WFGD system consists of the flue gas system, the limestone slurry supply system, the oxidation air supply system, and the gypsum slurry …

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Heavy metal migration and enrichment in desulfurization …

In the wet desulfurization process, the major components of the limestone slurry, such as Ca(OH) 2 react with SO 2 in the flue gas to produce sulfites, such as CaSO 3 and MgSO 3. ... Mercury in the coal-fired flue gas was captured by a limestone slurry in the desulfurization system. Because of the complex chemical composition of the ...

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Flue Gas Desulfurization (FGD) Working | Thermal Power Plant

Flue gas desulfurization (FGD) is the removal process of sulfur dioxide (SO2) from flue gases. Sulfur dioxide in gases is produced by the combustion of fossil fuels and many industrial processes such as gasoline refining as well as cement, paper, glass, steel, iron and copper production.

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Process migration and transformation of mercury in simulated wet …

Process migration and transformation of mercury in simulated wet flue gas desulfurization slurry system. Author links open overlay panel Mingyang Sun, Zimo Lou, Guanghuan Cheng, Shams Ali ... the combination of a wet scrubber and a catalyst has attracted research attention. During this process, the catalyst converts Hg 0 to Hg 2+, then the Hg 2 ...

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Coal-Fired Boiler Flue Gas Desulfurization System Based on Slurry …

Considering the operating cost of the desulfurization process, a novel system was proposed in the present work to increase the desulfurization efficiency and utilize the waste heat of the slurry. Taking the operating characteristics of the system into account, a new mathematical model was developed and the influence of the heat and mass ...

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