scholarly journals Experimental and numerical studies in elaboration the multi-cyclone with filter cells to processing of flue-gases of coal-fired and incineration power plants

2019 ◽  
Vol 288 ◽  
pp. 012077
Author(s):  
G I Belyaeva ◽  
M G Ziganshin ◽  
R D Sukhov
Keyword(s):  
Power Plants ◽  
Flue Gases ◽  
Numerical Studies

scholarly journals Effect of Flue Gases’ Corrosive Components on the Degradation Process of Evaporator Tubes

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 3860
Author(s):  
Mária Hagarová ◽  
Milan Vaško ◽  
Miroslav Pástor ◽  
Gabriela Baranová ◽  
Miloš Matvija
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Gas Flow ◽  
Degradation Process ◽  
Flue Gases ◽  
Saturated Steam ◽  
Mineral Salts ◽  
Related Factors ◽  
Local Overheating ◽  
Inner Surface

Corrosion of boiler tubes remains an operational and economic limitation in municipal waste power plants. The understanding of the nature, mechanism, and related factors can help reduce the degradation process caused by corrosion. The chlorine content in the fuel has a significant effect on the production of gaseous components (e.g., HCl) and condensed phases on the chloride base. This study aimed to analyze the effects of flue gases on the outer surface and saturated steam on the inner surface of the evaporator tube. The influence of gaseous chlorides and sulfates or their deposits on the course and intensity of corrosion was observed. The salt melts reacted with the steel surface facing the flue gas flow and increased the thickness of the oxide layer up to a maximum of 30 mm. On the surface not facing the flue gas flow, they disrupted the corrosive layer, reduced its adhesion, and exposed the metal surface. Beneath the massive deposits, a local overheating of the inner surface of the evaporator tubes occurred, which resulted in the release of the protective magnetite layer from the surface. Ash deposits reduce the boiler’s thermal efficiency because they act as a thermal resistor for heat transfer between the flue gases and the working medium in the pipes. The effect of insufficient feedwater treatment was evinced in the presence of mineral salts in the corrosion layer on the inner surface of the tube.

Efficient Recovery of Carbon Dioxide from Flue Gases of Coal-Fired Power Plants by Cyclic Fixed-Bed Operations over K2CO3-on-Carbon

1998 ◽  
Vol 37 (1) ◽  
pp. 185-191 ◽  
Author(s):  
Hiromu Hayashi ◽  
Jun Taniuchi ◽  
Nobuyoshi Furuyashiki ◽  
Shigeru Sugiyama ◽  
Shinichi Hirano ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Power Plants ◽  
Fixed Bed ◽  
Flue Gases ◽  
Efficient Recovery

Integrity Assessment of Cracked Piping Components: Experimental, Analytical and Numerical Studies

2005 ◽  
Author(s):  
J. Chattopadhyay ◽  
T. V. Pavankumar ◽  
A. K. S. Tomar ◽  
B. K. Dutta ◽  
H. S. Kushwaha
Keyword(s):  
Power Plants ◽  
Research Centre ◽  
Experimental Investigations ◽  
Integrity Test ◽  
Element Analysis ◽  
Integrity Assessment ◽  
Pipe Elbow ◽  
Numerical Studies ◽  
Point Bend ◽  
Considerable Work

Integrity assessment of piping components is very essential for safe and reliable operation of power plants. Over the last several decades, considerable work has been done throughout the world to develop a methodology for integrity assessment of pipes and elbows, appropriate for the material involved. However, there is scope of further development/improvement of issues, particularly for pipe bends, that are important for accurate integrity assessment of piping. Considering this aspect, a comprehensive Component Integrity Test Program was initiated in 1998 at Bhabha Atomic Research Centre (BARC), India. In this program, both theoretical and experimental investigations were undertaken to address various issues related to the integrity assessment of pipes and elbows. Under the experimental investigations, fracture mechanics tests have been conducted on pipes and elbows of 200–400 mm nominal bore (NB) diameter with various crack configurations and sizes under different loading conditions. Tests on small tensile and three point bend specimens, machined from the tested pipes, have also been done to evaluate the actual stress-strain and fracture resistance properties of pipe/elbow material. The load-deflection curve and crack initiation loads predicted by non-linear finite element analysis matched well with the experimental results. The theoretical collapse moments of throughwall circumferentially cracked elbows, predicted by the recently developed equations, are found to be closer to the test data compared to the other existing equations. The role of stress triaxialities ahead of crack tip is also shown in the transferability of J-Resistance curve from specimen to the component.

scholarly journals Understanding of tri-reforming of methane over Ni/Mg/Al hydrotalcite-derived catalyst for CO2 utilization from flue gases from natural gas-fired power plants

2020 ◽  
Vol 42 ◽  
pp. 101317 ◽  
Author(s):  
Katarzyna Świrk ◽  
Jacek Grams ◽  
Monika Motak ◽  
Patrick Da Costa ◽  
Teresa Grzybek
Keyword(s):  
Natural Gas ◽  
Power Plants ◽  
Flue Gases ◽  
Co2 Utilization

scholarly journals Improving the efficiency of power boilers by cooling the flue gases to the lowest possible temperature under the conditions of safe operation of reinforced concrete and brick chimneys of power plants

2018 ◽  
Vol 245 ◽  
pp. 07014 ◽  
Author(s):  
Evgeny Ibragimov ◽  
Sergei Cherkasov
Keyword(s):  
Reinforced Concrete ◽  
Power Plant ◽  
Flue Gas ◽  
Power Plants ◽  
Thermal Power ◽  
Operating Mode ◽  
Flue Gases ◽  
Technical Solution ◽  
Gas Temperature ◽  
Safe Operation

The article presents data on the calculated values of improving the efficiency of fuel use at the thermal power plant as a result of the introduction of a technical solution for cooling the flue gases of boilers to the lowest possible temperature under the conditions of safe operation of reinforced concrete and brick chimneys with a constant value of the flue gas temperature, when changing the operating mode of the boiler.

Dispersion of Flue Gases from Power Plants in Brunei Darussalam

2003 ◽  
Vol 160 (1-2) ◽  
pp. 405-418
Author(s):  
P.N. Tandon ◽  
P. Ramalingam ◽  
A.Q. Malik
Keyword(s):  
Power Plants ◽  
Flue Gases ◽  
Brunei Darussalam

Mercury emission characteristics of flue gases from two coal-fired power plants in Xinjiang, China

2017 ◽  
Vol 39 (2) ◽  
pp. 240-245 ◽  
Author(s):  
Xue Wang ◽  
Ping Chen ◽  
Xinquan Jiang ◽  
Qibin Wu ◽  
Yin Liu ◽  
...  
Keyword(s):  
Power Plants ◽  
Flue Gases ◽  
Emission Characteristics ◽  
Mercury Emission

scholarly journals Rotary Adsorption: Selective Recycling of CO2 in Combined Cycle Gas Turbine Power Plants

2020 ◽  
Vol 8 ◽  
Author(s):  
Laura Herraiz ◽  
Erika Palfi ◽  
Eva Sánchez Fernández ◽  
Mathieu Lucquiaud
Keyword(s):  
Activated Carbon ◽  
Pressure Drop ◽  
Gas Turbine ◽  
Power Plants ◽  
Ambient Pressure ◽  
Ambient Air ◽  
Combined Cycle ◽  
Flue Gases ◽  
Design Assessment ◽  
Exponential Factor

A conceptual design assessment shows that the use of structured adsorbents in a regenerative adsorption wheel is technically feasible for the application of selective exhaust gas recirculation (SEGR) in combined cycle gas turbine (CCGT) power plants. As the adsorber rotates, CO2 is selectively transferred from a flue gas stream to an ambient air stream fed to the gas turbine compressor, increasing the CO2 concentration and reducing the flow rate of the fraction of the flue gases treated in a post-combustion CO2 capture system. It imposes an estimated pressure drop of 0.25 kPa, unlike a pressure drop of 10 kPa reported for selective CO2 membrane systems, preventing a significant derating of the gas turbine. An equilibrium model of a rotary adsorber with commercially available activated carbon evaluates the inventory of the adsorbent and sizes the wheel rotor. Two rotary wheels of 24 m diameter and 2 m length are required per gas turbine—heat recovery steam generator train to achieve an overall CO2 capture level of 90% in a CCGT power plant (ca. 820 MWe) with SEGR “in parallel” to the capture plant. Two to five rotary wheels are required for a configuration with SEGR “in series” to the capture plant. A reduction of 50% in the mass of the adsorbent would be possible with Zeolite 13X instead of activated carbon, yet the hydrophilicity of zeolites are detrimental to the capacity and upstream dehydration of the flue gases is required. A parametric analysis of the equilibrium properties provides guidelines for adsorbent development. It suggests the importance of balancing the affinity for CO2 to allow the regeneration of the adsorbent with air at near ambient pressure and temperature, to minimise the inventory of the adsorbent within practical limits. An adsorbent with a saturation capacity of 8 mol/kg, a heat of adsorption from 24 to 28 kJ/mol CO2 and a pre-exponential factor of the equilibrium constant from 2 × 10–6 to 9 × 10–6 kPa−1 would result in an inventory below 200 kg, i.e., approximately the limit for the use of a single rotary wheel system.

scholarly journals REVIEW OF TECHNOLOGIES FOR REDUCING OF NITROGEN OXIDES EMISSIONS ON COAL-FIRED POWER PLANTS

2019 ◽  
pp. 50-59
Author(s):  
O.M. Kolomiets
Keyword(s):  
Nitrogen Oxides ◽  
Power Plants ◽  
Gas Flow ◽  
Treatment Plant ◽  
Electrical Energy ◽  
Water Soluble ◽  
Flue Gases ◽  
Oxidation Reactions ◽  
Metal Compounds ◽  
Gas Cleaning

The paper discusses the technologies of reducing the concentration of nitrogen oxides in the exhaust flue gases during the combustion of coal in the boiler units of power plants that produce heat and electrical energy. According to the results of the analysis, the influence of the method of oxidizing gaseous nitrogen oxides on the efficiency of the treatment plant was revealed. It has been established that during the reconstruction of the gas cleaning system, the advantage is in the technology in which, at the first stage, a gaseous oxidizer is added to the gas flow to convert nitric oxide into heavier water-soluble compounds. At the second stage, an aqueous solution of alkali metal compounds or ammonia is injected into the gas mixture for chemical bonding of the products of oxidation reactions. Thus, this technology allows reducing the concentration of nitrogen oxides in flue gases by 90–95% and meeting the requirements of regulatory documents on emissions of pollutants into the environment. Bibl. 11, Fig. 4, Tab. 5.

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