Modeling Absorbers in WFGD System and Prediction of SO2 Removal Rate Based on Size Parameters

2020 ◽  
Vol 142 (8) ◽  
Author(s):  
Halil Ibrahim Gonul ◽  
Mehmet Bilen
Keyword(s):  
Power Plants ◽  
Removal Rate ◽  
Thermal Power ◽  
Coal Ash ◽  
Chloride Ion ◽  
Vital Role ◽  
Flue Gas Desulfurization ◽  
So2 Removal ◽  
Good Agreement

Abstract In this study, research was carried out on absorber (in and exit) in the wet flue gas desulfurization (WFGD) system of a local thermal power plant. WFGD plays a vital role in terms of environment since it includes water, chloride ion, gypsum, and coal ash. In the progress of WFGD in power plants, absorber has the key role of SO2 removal. This study focuses on modeling of the absorber in the WFGD system. In the context of this study, sample from absorber in limestone slurry was analyzed based on particle size distribution (PSD) and elemental composition, and a model was proposed to predict SO2 removal rate. The model proposed employs basically the parameters previously proposed by some researchers, and in addition, the PSD, i.e., size parameters like D32 and D43. The model proposed is in good agreement with the results obtained.

scholarly journals Study on SO3 Cooperative Removal Effect of Ultra-low Emission Technology in Coal-fired Power Plants

2018 ◽  
Vol 53 ◽  
pp. 04005 ◽  
Author(s):  
Ding Yang ◽  
Yi Luo ◽  
XingLian Ye ◽  
WeiXiang Chen ◽  
Jun Guo ◽  
...  
Keyword(s):  
Low Temperature ◽  
Flue Gas ◽  
Power Plants ◽  
Electrostatic Precipitator ◽  
Removal Rate ◽  
Flue Gas Desulfurization ◽  
Paper Briefly ◽  
Low Emission ◽  
Electrostatic Precipitators

SO3 is one of the main precursors of atmospheric PM2.5, and its emission has attracted more and more attention in the industry. This paper briefly analyzes the harm of SO3 and the method of controlled condensation to test SO3. The effect of cooperative removal of SO3 by ultra-low emission technology in some coal-fired power plants has been tested by using the method of controlled condensation. The results show that the cooperative removal of SO3 by ultra-low emission technology in coal-fired power plants is effective. The removal rate of SO3 by low-low temperature electrostatic precipitators and electrostatic-fabric integrated precipitators can be exceeded 80%, while the removal rate of SO3 by wet flue gas desulfurization equipment displays lower than the above two facilities, and the wet electrostatic precipitator shows a better removal effect on SO3. With the use of ultra-low emission technology in coal-fired power plants, the SO3 emission concentration of the tail chimney reaches less than 1 mg / Nm3.

scholarly journals Influence of the Size of Coal Ash FAU Zeolites Used as Dopants on the Sensing Properties of Nb2O5 Thin Films

2020 ◽  
Vol 2 (1) ◽  
pp. 3
Author(s):  
Katerina Lazarova ◽  
Silviya Boycheva ◽  
Marina Vasileva ◽  
Denitza Zgureva ◽  
Tsvetanka Babeva
Keyword(s):  
Thin Films ◽  
Power Plants ◽  
Thermal Power ◽  
Coal Ash ◽  
Reflectance Spectra ◽  
Sensing Properties ◽  
Volatile Organic ◽  
Coating Method ◽  
Reflectance Measurements

In this study, solid waste from coal combustion in thermal power plants (TPPs) was used for the synthesis of zeolite Na-X samples. They were prepared by the long-term alkaline atmospheric conversion of coal ash collected from the electrostatic precipitators in the TPP “AES Galabovo”. When used in the form of thin films/layers, the optical detection of volatile organic compounds (VOCs) is possible due to a change in their reflectance spectra and color. In order to improve the sensing properties of synthesized zeolites, they were wet milled for 60 s and both milled and unmilled zeolites were used as dopants for the niobium oxide matrix in the form of thin films deposited by the spin-coating method on a silicon substrate. The surface morphology and structure of both zeolite powders were studied by scanning electron microscopy, while their size was determined by dynamic light scattering (DLS) spectra. Optical constants (refractive index, n, and extinction coefficient, k) and the thickness of the films were calculated from reflectance measurements. The change in the reflection coefficient ∆R of the films was determined from measured reflectance spectra prior to and after exposure to probe acetone molecules. An increase in the reaction of the films with milled zeolites to acetone, compared to the samples with unmilled zeolites, is demonstrated.

MODELING THE TECHNOGENIC IMPACT OF CHPS ON THE ENVIRONMENT AND THE DEVELOPMENT OF ENGINEERING AND ENVIRONMENTAL PROTECTION MEASURES

2019 ◽  
Vol 12 (3) ◽  
pp. 27-34
Author(s):  
Алла Звягинцева ◽  
Alla Zvyaginceva ◽  
Светлана Сазонова ◽  
Svetlana Sazonova ◽  
В. Кульнева ◽  
...  
Keyword(s):  
Power Plants ◽  
Thermal Power ◽  
Coal Ash ◽  
Combined Heat And Power ◽  
Fuel Oil ◽  
Protection Measures ◽  
Technogenic Impact ◽  
Energy Facility ◽  
Negative Environmental Impact ◽  
Fuel Source

The waste generated during the operation of the thermal electric central, an energy facility, is considered. The analysis of atmospheric pollution by emissions of the Voronezh TPP-1, which uses coal as the main fuel, is carried out. A comparison is made with a thermal power plant using gas as a fuel source. The maximum allowable emission standards for pollutants generated during the use of coal are established and the excess of the MPC value by various types of emissions is shown: dioxide and nitric oxide; fuel oil and NO2 + SO2 ash; sulphurous anhydride and carbon monoxide; soot and coal ash. The size of the Sanitary Protection Zone of TPP-1 was determined. Measures aimed at reducing the negative environmental impact of such energy facilities as combined heat and power plants are proposed

POSSIBLE USE OF FLY ASH IN CERAMIC INDUSTRIES: AN INNOVATIVE METHOD TO REDUCE ENVIRONMENTAL POLLUTION

2013 ◽  
Vol 22 ◽  
pp. 99-102 ◽  
Author(s):  
GAYATRI SHARMA ◽  
S. K. MEHLA ◽  
TARUN BHATNAGAR ◽  
ANNU BAJAJ
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Fine Particles ◽  
Thermal Power ◽  
Coal Ash ◽  
Natural Soil ◽  
Thermal Power Plants ◽  
Silica Alumina ◽  
Near Future ◽  
Land Water

The process of coal combustion results in coal ash, 80% of which is very fine in nature & is thus known as fly ash. Presently, in India, about 120 coal based thermal power plants are producing about 90-120 million tons of fly ash every year. With increase in demand of power energy, more and more thermal power plants are expected to commission in near future and it is expected that fly ash generation will be 225 million tons by 2017. Disposal of fly ash requires large quantity of land, water and energy and its fine particles, if not disposed properly, by virtue of their weightless, can become air born and adversely affect the entire Environment. These earth elements primarily consist of silica, alumina & iron etc. and its physicochemical parameters are closely resembles with volcanic ash, natural soil etc. These properties, therefore, makes it suitable for use in ceramic industries and helps in saving the environment and resources.

scholarly journals Coal Fly Ash Ceramics: Preparation, Characterization, and Use in the Hydrolysis of Sucrose

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Ricardo Pires dos Santos ◽  
Jorge Martins ◽  
Carlos Gadelha ◽  
Benildo Cavada ◽  
Alessandro Victor Albertini ◽  
...  
Keyword(s):  
Fly Ash ◽  
Surface Area ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Thermal Power ◽  
Coal Ash ◽  
Mineralogical Composition ◽  
Degree Of Hydrolysis ◽  
High Degree ◽  
Hydrolysis Of

Coal ash is a byproduct of mineral coal combustion in thermal power plants. This residue is responsible for many environmental problems because it pollutes soil, water, and air. Thus, it is important to find ways to reuse it. In this study, coal fly ash, obtained from the Presidente Médici Thermal Power Plant, was utilized in the preparation of ceramic supports for the immobilization of the enzyme invertase and subsequent hydrolysis of sucrose. Coal fly ash supports were prepared at several compaction pressures (63.66–318.30 MPa) and sintered at 1200°C for 4 h. Mineralogical composition (by X-ray diffraction) and surface area were studied. The ceramic prepared with 318.30 MPa presented the highest surface area (35 m2/g) and amount of immobilized enzyme per g of support (76.6 mg/g). In assays involving sucrose inversion, it showed a high degree of hydrolysis (around 81%) even after nine reuses and 30 days’ storage. Therefore, coal fly ash ceramics were demonstrated to be a promising biotechnological alternative as an immobilization support for the hydrolysis of sucrose.

scholarly journals CONVERSION OF COAL FLY ASH TO ZEOLITE-BASED IRON OXIDE MAGNETIC NANOCOPOSITES BY MODIFIED FUSION-HYDROTHERMAL SYNTHESIS

2020 ◽  
pp. 30-35
Author(s):  
Silviya Boycheva ◽  
Denitza Zgureva
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Fly Ash ◽  
Power Plants ◽  
Coal Fly Ash ◽  
Thermal Power ◽  
Coal Ash ◽  
Low Temperature Processing ◽  
Oxide Phases ◽  
Stage Synthesis

Coal fly ash generated in Thermal Power Plants is utilized for synthesis of zeolites due to its aluminosilicate composition. The highest degree of zeolitization of coal ash in a particular zeolite phase is achieved by double-stage synthesis involving successive alkaline melting and hydrothermal activation of the reaction mixtures, while the uniform distribution of the iron oxides transferred from the raw coal ash is ensured by ultrasonic treatment. However, the applied melting step results in the oxidation of the magnetic iron oxide phases to non-magnetic ones, which results in the loss of magnetic properties of the resulting materials. The present investigation focuses on an improved double- stage synthesis procedure by the addition of raw coal ash containing magnetite between high temperature and low temperature processing. In this way, the magnetic phase is retained in the final product and the magnetic properties of the zeolites are preserved, which is important for their application in the adsorption of pollutants from wastewater.

scholarly journals The Influence of Terminology on the Effective Solution of the Coal Ash Handling Problem

2017 ◽  
Vol 2 (2) ◽  
pp. 133
Author(s):  
V.Y. Putilov ◽  
I.V. Putilova ◽  
H-J Feuerborn
Keyword(s):  
Power Plants ◽  
Fossil Fuel ◽  
Thermal Power ◽  
Coal Ash ◽  
Thermal Power Plants ◽  
Effective Solution ◽  
Global Trends ◽  
Best Available Technologies ◽  
The Status ◽  
Definition Of

<p class="TTPTitle"><span>The paper presents the data on a structure of conventional fuels consumption, as well as a structure of fossil fuel consumption at thermal power plants (TPPs) in Russia. The issue of applying the Best Available Technologies (BAT) in Russia is touched upon. Statistics on production and utilization of coal ash in Russia and other countries is given. The paper provides information on the status and terminology of coal ash in different countries. It contains an impact of terminology on the effectiveness of solving the coal ash handling problem in Russia. The paper includes a new legislative definition of coal ash produced at thermal power plants and boiler houses of Russia which meets modern conditions and global trends, as well as requirements for coal energy sector.</span></p>

scholarly journals Recent Advances in Ammonia Combustion Technology in Thermal Power Generation System for Carbon Emission Reduction

Energies ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5604
Author(s):  
Hookyung Lee ◽  
Minjung Lee
Keyword(s):  
Power Generation ◽  
Gas Turbines ◽  
Power Plants ◽  
Thermal Power ◽  
Hydrogen Energy ◽  
Application Range ◽  
Combustion Technology ◽  
Power Generation System ◽  
Power Generation Systems

With the formation of an international carbon-neutral framework, interest in reducing greenhouse gas emissions is increasing. Ammonia is a carbon-free fuel that can be directly combusted with the role of an effective hydrogen energy carrier, and its application range is expanding. In particular, as research results applied to power generation systems such as gas turbines and coal-fired power plants have been reported, the technology to use them is gradually being advanced. In the present study, starting with a fundamental combustion research case conducted to use ammonia as a fuel, the application research case for gas turbines and coal-fired power plants was analyzed. Finally, we report the results of the ammonia-air burning flame and pulverized coal-ammonia-air co-fired research conducted at the authors’ research institute.

scholarly journals Flue Gas Desulphurization in Circulating Fluidized Beds

Energies ◽  
2019 ◽  
Vol 12 (20) ◽  
pp. 3908 ◽  
Author(s):  
Deng ◽  
Ansart ◽  
Baeyens ◽  
Zhang
Keyword(s):  
Contact Time ◽  
Power Plants ◽  
Fluidized Beds ◽  
Circulating Fluidized Bed ◽  
Heterogeneous Reaction ◽  
Removal Rate ◽  
Waste Incineration ◽  
Circulating Fluidized Beds ◽  
Dry Process ◽  
So2 Removal

Sulphur dioxide (SO2) is mostly emitted from coal-fueled power plants, from waste incineration, from sulphuric acid manufacturing, from clay brick plants and from treating nonferrous metals. The emission of SO2 needs to be abated. Both wet scrubbing (absorption) and dry or semi-dry (reaction) systems are used. In the dry process, both bubbling and circulating fluidized beds (BFB, CFB) can be used as contactor. Experimental results demonstrate a SO2-removal efficiency in excess of 94% in a CFB application. A general model of the heterogeneous reaction is proposed, combining the external diffusion of SO2 across the gas film, the internal diffusion of SO2 in the porous particles and the reaction as such (irreversible, 1st order). For the reaction of SO2 with a fine particulate reactant, the reaction rate constant and the relevant contact time are the dominant parameters. Application of the model equations reveals that the circulating fluidized bed is the most appropriate technique, where the high solid to gas ratio guarantees a high conversion in a short reaction time. For the CFB operation, the required gas contact time in a CFB at given superficial gas velocities and solids circulation rates will determine the SO2 removal rate.

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