Constructal allocation of heat transfer area in Flue Gas Desulfurization equipment for coal-firing power plants

2015 ◽  
Vol 40 (4) ◽  
pp. 529-536 ◽  
Author(s):  
J. Lee ◽  
Y. Kim
Keyword(s):  
Heat Transfer ◽  
Flue Gas ◽  
Power Plants ◽  
Flue Gas Desulfurization ◽  
Heat Transfer Area

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.

Artificial Intelligence-Based Emission Reduction Strategy for Limestone Forced Oxidation Flue Gas Desulfurization System

2020 ◽  
Vol 142 (9) ◽  
Author(s):  
Ghulam Moeen Uddin ◽  
Syed Muhammad Arafat ◽  
Waqar Muhammad Ashraf ◽  
Muhammad Asim ◽  
Muhammad Mahmood Aslam Bhutta ◽  
...  
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Operating Conditions ◽  
Process Models ◽  
Flue Gas Desulfurization ◽  
Optimum Operating ◽  
Input Control ◽  
Network Process ◽  
Coal Power Plants ◽  
Forced Oxidation

Abstract The emissions from coal power plants have serious implication on the environment protection, and there is an increasing effort around the globe to control these emissions by the flue gas cleaning technologies. This research was carried out on the limestone forced oxidation (LSFO) flue gas desulfurization (FGD) system installed at the 2*660 MW supercritical coal-fired power plant. Nine input variables of the FGD system: pH, inlet sulfur dioxide (SO2), inlet temperature, inlet nitrogen oxide (NOx), inlet O2, oxidation air, absorber slurry density, inlet humidity, and inlet dust were used for the development of effective neural network process models for a comprehensive emission analysis constituting outlet SO2, outlet Hg, outlet NOx, and outlet dust emissions from the LSFO FGD system. Monte Carlo experiments were conducted on the artificial neural network process models to investigate the relationships between the input control variables and output variables. Accordingly, optimum operating ranges of all input control variables were recommended. Operating the LSFO FGD system under optimum conditions, nearly 35% and 24% reduction in SO2 emissions are possible at inlet SO2 values of 1500 mg/m3 and 1800 mg/m3, respectively, as compared to general operating conditions. Similarly, nearly 42% and 28% reduction in Hg emissions are possible at inlet SO2 values of 1500 mg/m3 and 1800 mg/m3, respectively, as compared to general operating conditions. The findings are useful for minimizing the emissions from coal power plants and the development of optimum operating strategies for the LSFO FGD system.

scholarly journals Investigation and Control Technology on Excessive Ammonia-Slipping in Coal-Fired Plants

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4249
Author(s):  
Xuan Yao ◽  
Man Zhang ◽  
Hao Kong ◽  
Junfu Lyu ◽  
Hairui Yang
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Catalytic Reduction ◽  
Flue Gas Desulfurization ◽  
Ammonia Emission ◽  
Dust Collector ◽  
Neural Network Algorithm ◽  
Injection Technology ◽  
And Control ◽  
The Relationship

After the implementation of the ultra-low emissions regulation on the coal-fired power plants in China, the problem of the excessive ammonia-slipping from selective catalytic reduction (SCR) seems to be more severe. This paper analyzes the operating statistics of the coal-fired plants including 300 MW/600 MW/1000-MW units. Statistics data show that the phenomenon of the excessive ammonia-slipping is widespread. The average excessive rate is over 110%, while in the small units the value is even higher. A field test data of nine power plants showed that excessive ammonia-slipping at the outlet of SCR decreased following the flue-gas process. After most ammonia reduced by the dust collector and the wet flue-gas desulfurization (FGD), the ammonia emission at the stack was extremely low. At same time, a method based on probability distribution is proposed in this paper to describe the relationship between the NH3/NOX distribution deviation and the De–NOX efficiency/ammonia-slipping. This paper also did some original work to solve the ammonia-slipping problem. A real-time self-feedback ammonia injection technology using neural network algorithm to predict and moderate the ammonia distribution is proposed to decrease the NH3/NOX deviation and excessive ammonia-slipping. The technology is demonstrated in a 600-MW unit and works successfully. The excessive ammonia-slipping problem is well controlled after the implementation of the technology.

A model for performance optimization of wet flue gas desulfurization systems of power plants

2008 ◽  
Vol 89 (11) ◽  
pp. 1025-1032 ◽  
Author(s):  
Yi Zhong ◽  
Xiang Gao ◽  
Wang Huo ◽  
Zhong-yang Luo ◽  
Ming-jiang Ni ◽  
...  
Keyword(s):  
Flue Gas ◽  
Performance Optimization ◽  
Power Plants ◽  
Flue Gas Desulfurization

Methods of Thermal Calculations for a Condensing Waste-Heat Exchanger

2014 ◽  
Vol 35 (4) ◽  
pp. 447-461 ◽  
Author(s):  
Paweł Rączka ◽  
Kazimierz Wójs
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Water Vapour ◽  
Flue Gas ◽  
Waste Heat ◽  
Pilot Scale ◽  
Dew Point ◽  
Steam Boiler ◽  
Heat Transfer Area ◽  
Condensing Heat Exchanger

Abstract The paper presents the algorithms for a flue gas/water waste-heat exchanger with and without condensation of water vapour contained in flue gas with experimental validation of theoretical results. The algorithms were used for calculations of the area of a heat exchanger using waste heat from a pulverised brown coal fired steam boiler operating in a power unit with a capacity of 900 MWe. In calculation of the condensing part, the calculation results obtained with two algorithms were compared (Colburn-Hobler and VDI algorithms). The VDI algorithm allowed to take into account the condensation of water vapour for flue gas temperatures above the temperature of the water dew point. Thanks to this, it was possible to calculate more accurately the required heat transfer area, which resulted in its reduction by 19 %. In addition, the influence of the mass transfer on the heat transfer area was taken into account, which contributed to a further reduction in the calculated size of the heat exchanger - in total by 28% as compared with the Colburn-Hobler algorithm. The presented VDI algorithm was used to design a 312 kW pilot-scale condensing heat exchanger installed in PGE Belchatow power plant. Obtained experimental results are in a good agreement with calculated values.

Mass Balance and Isotope Characteristics of Mercury in Two Coal-Fired Power Plants in Guizhou, China

2012 ◽  
Vol 518-523 ◽  
pp. 2576-2579 ◽  
Author(s):  
Zhong Gen Li ◽  
Xin Bin Feng ◽  
Guang Hui Li ◽  
Run Sheng Yin ◽  
Ben Yu
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Power Plants ◽  
Electrostatic Precipitator ◽  
Isotope Composition ◽  
Flue Gas Desulfurization ◽  
Guizhou Province ◽  
Mercury Removal ◽  
Stable Isotope Composition ◽  
Coal Properties

Mercury distribution and stable isotope composition in solid samples of two coal-fired power plants in Guizhou province were determined. Results shown electrostatic precipitator (ESP) has mercury removal efficiency between 29.53% to 58.41%, and wet flue gas desulfurization (WFGD) between 12.29% to 58.60%, mercury removal efficiency of ESP and WFGD mainly depends on the coal properties. Most mercury (70% to 88%) in coal was captured by the combination of ESP+WFGD. Mercury in fly ash and gypsum were much heavier in isotope composition compared to the coal, hints mercury escaped into atmosphere was enriched in lighter mercury isotopes.

scholarly journals Analiza zmian podaży gipsu w Polsce w świetle rozwoju odsiarczania spalin w elektrowniach konwencjonalnych / Analysis of the Changes in Polish Gypsum Resources in the Context of Flue Gas Desulfurization in Conventional Power Plants

2015 ◽  
Vol 31 (2) ◽  
pp. 93-107
Author(s):  
Jarosław Szlugaj ◽  
Wojciech Naworyta
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Flue Gas Desulfurization

Streszczenie Dwadzieścia lat temu w elektrowni Bełchatów uruchomiono pierwszą w Polsce instalację odsiar- czania spalin metodą mokrą, w której jako produkt uboczny otrzymuje się pełnowartościowy gips syntetyczny. W konsekwencji zobowiązań międzynarodowych odsiarczanie wdrożono stopniowo w wielu innych krajowych elektrowniach. W wyniku odsiarczania metodą mokrą wapienną na rynku surowców budowlanych pojawiły się duże ilości gipsu syntetycznego. Artykuł jest próbą oceny zmian na rynku gipsu w Polsce jakie dokonały się w wyniku tego procesu. Przedstawiono stan zasobów gipsu naturalnego oraz wydobycie w ostatnich dwóch dekadach. Poddano analizie proces wdrażania systemów odsiarczania w krajowych elektrowniach z podaniem zdolności produkcyjnej i produkcji rzeczywistej gipsów syntetycznych. Omówiono sposób zagospodarowania otrzymywanych gipsów syntetycznych. Porównano produkcję gipsów naturalnych i syntetycznych w ostatnim dwudziesto- leciu. Na podstawie oficjalnych planów rozwojowych polskiej energetyki przedstawiono prognozę podaży gipsów z odsiarczania w najbliższej dekadzie. W studium przypadku na przykładzie pro- jektowanej kopalni węgla brunatnego przedstawiono metodę prognozowania podaży gipsu z instalacji odsiarczania spalin w elektrowni opalanej węglem z tego złoża. W podsumowaniu podkreślono, że zmiany w pozyskaniu związków siarki są efektem postępu technologicznego, którego głównym motorem jest potrzeba ochrony środowiska naturalnego.

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