Impact of variables on efficiency of flue gas desulphurisation plant in Longannet Power Station (ScottishPower)

2016 ◽  
Vol 12 (2) ◽  
pp. 162
Author(s):  
Alejandro Sanchez Lafuente ◽  
Stuart Edwardson
Keyword(s):  
Flue Gas ◽  
Power Station

Numerical Prediction of Erosion of Mild Steel Surfaces by Boiler Fly Ash Particles

Volume 1 ◽  
2004 ◽  
Author(s):  
John G. Mbabazi ◽  
Thomas J. Sheer
Keyword(s):  
Fly Ash ◽  
Mild Steel ◽  
Flue Gas ◽  
Gas Flow ◽  
Erosive Wear ◽  
Test Facility ◽  
Experimental Investigations ◽  
Power Station ◽  
Erosion Rates ◽  
Steel Surfaces

Fly ash particles entrained in the flue gas from boiler furnaces in coal-fired power stations can cause serious erosive wear on steel surfaces along the downstream flow path. This paper describes research into fly ash impingement erosion on such surfaces, with particular reference to the heat transfer plates in rotary regenerative air heaters. The effect of the ash particle impact velocity and impact angle on the erosive wear of mild steel surfaces was determined through experimental investigations, using three different power station ash types. The experimental data were used to calibrate a fundamentally-derived model for the prediction of erosion rates. This erosion model was incorporated into a particle-tracking CFD flow simulation of the ash-laden flue gas flow through the complex channels between corrugated air heater plates. The predicted erosion rates were compared with measured erosion rates obtained using a large accelerated-erosion test facility located at a power station. Good agreement was obtained, the predictions generally being within 20 percent of the measured values.

Some applications of the ultramicrobalance to power station of flue gas research

1978 ◽  
Vol 24 (2) ◽  
pp. 281-291 ◽  
Author(s):  
F.D. Evans ◽  
B.H. Targett
Keyword(s):  
Flue Gas ◽  
Power Station

Corrosion of Tail Heated Surface Tube under Flue Gas Medium in LNG Power Station HRSG

2013 ◽  
Vol 331 ◽  
pp. 74-78
Author(s):  
Zhong Bing Chen ◽  
Yu Hui Chen ◽  
Bo Yan Li ◽  
Xiao Yun Zeng ◽  
Yi Shi Lv ◽  
...  
Keyword(s):  
Stress Corrosion ◽  
Flue Gas ◽  
Heated Surface ◽  
Outer Wall ◽  
Influential Factors ◽  
Corrosion Products ◽  
Dew Point ◽  
Feed Water ◽  
Power Station ◽  
Gas Medium

Corrosion type, reasons and influential factors of the tail heated surface tube of the low carbon steel under the flue gas medium in LNG(Liquefied Natural Gas) power station HRSG(Heat Recovery Steam Generator) were researched through cracks morphology observation, corrosion products analysis, corrosion elements measurement and tube wall temperature field FEM calculation. Results showed that the crack initiated from the outer wall of the tube and propagated toward the inner wall with the arborescent morphology. Intergranular embrittlement ruptured. Rock type feature and secondary crack were observed on the fracture. Mud pattern and polygonal figure of the corrosion products were present. According to these morphology characteristics, the crack was identified as stress corrosion crack, and corrosion type was SCC(Stress Corrosion Cracking). Reasons of SCC were that low feed water or flue gas temperature during a certain period of the unit startup and shutdown for peaking operation brought about the temperature of the outer wall of tube below the flue gas dew point, and the flue gas became dew and corrosion solution emerged on the outer wall of tube. The SCC component was CO2 solution according to the corrosion products. S and Cl elements were found in the outer wall of tube, but their effects on SCC are still needed more researches.

scholarly journals Errors Associated With Excess Air Multipoint Measurement Systems

2015 ◽  
Vol 36 (4) ◽  
pp. 405-423 ◽  
Author(s):  
Charlene Ramsunkar ◽  
Chris van Tonder ◽  
Walter Schmitz
Keyword(s):  
Flue Gas ◽  
Single Point ◽  
Flow Simulation ◽  
Simulation Software ◽  
Sampling Errors ◽  
Power Station ◽  
Air Content ◽  
Power Stations ◽  
Excess Air ◽  
Duct Geometry

Abstract Boiler combustion air is generally controlled by the excess air content measured at the boiler economiser outlet using oxygen (O2) analysers. Due to duct geometry and dimensions, areas of high and low O2 concentrations in the flue gas duct occur, which poses a problem in obtaining a representative measurement of O2 in the flue gas stream. Multipoint systems as opposed to single point systems are more favourable to achieve representative readings. However, ash blockages and air leakages influence the accuracy of O2 measurement. The design of multipoint system varies across ESKOMs’ Power Stations. This research was aimed at evaluating the accuracy of the multipoint oxygen measurement system installed at Power Station A and to determine the systematic errors associated with different multipoint systems designs installed at Power Stations' A and B. Using flow simulation software, FloEFDTM and Flownex®, studies were conducted on two types of multipoint system designs This study established that significantly large errors, as high as 50%, were noted between the actual and measured flue gas O2. The design of the multipoint system extraction pipes also introduces significant errors, as high as 23%, in the O2 measured. The results indicated that the sampling errors introduced with Power Station A’s system can be significantly reduced by adopting the sampling pipe design installed at Power Station B.

Guangdong Electric Power Sustainable Development Strategy

2005 ◽  
Author(s):  
Bin Ma ◽  
Hua Yang ◽  
Hongkai Liao
Keyword(s):  
Sustainable Development ◽  
Development Strategy ◽  
Flue Gas ◽  
Nuclear Power ◽  
Large Scale ◽  
Electricity Consumption ◽  
Guangdong Province ◽  
Power Station ◽  
Existing Problems ◽  
The Social

This article introduces the current situation of Guangdong energy supply and electricity consumption, analyses the electricity structure and existing problems and points out that in order to meet the social demand for electricity and sustainable development of Guangdong province, it must expand the scale of West-East electricity transmission, build large-scale super-critical generation units, accelerate building nuclear power station, build LNG generation units in the load centers, promote the growth of wind- electricity, develop flue gas desurlphurization and denitrification technology, etc.

scholarly journals Externality costs of the coal-fuel cycle: The case of Kusile Power Station

2017 ◽  
Vol 113 (9/10) ◽  
Author(s):  
Nonophile P. Nkambule ◽  
James N. Blignaut
Keyword(s):  
South Africa ◽  
Flue Gas ◽  
Electricity Generation ◽  
Fuel Cycle ◽  
Daily Life ◽  
Renewable Energy Sources ◽  
Ecological Systems ◽  
Energy Sources ◽  
Power Station ◽  
Coal Fuel

Coal-based electricity is an integral part of daily life in South Africa and globally. However, the use of coal for electricity generation carries a heavy cost for social and ecological systems that goes far beyond the price we pay for electricity. We developed a model based on a system dynamics approach for understanding the measurable and quantifiable coal-fuel cycle burdens and externality costs, over the lifespan of a supercritical coal-fired power station that is fitted with a flue-gas desulfurisation device (i.e. Kusile Power Station). The total coal-fuel cycle externality cost on both the environment and humans over Kusile’s lifespan was estimated at ZAR1 449.9 billion to ZAR3 279 billion or 91c/kWh to 205c/kWh sent out (baseline: ZAR2 172.7 billion or 136c/kWh). Accounting for the life-cycle burdens and damages of coal-derived electricity conservatively, doubles to quadruples the price of electricity, making renewable energy sources such as wind and solar attractive alternatives.

Investigation of a Gas Turbine Process With Reheat Combustion at Flue Gas Recirculation and Oxyfuel-Conditions

2017 ◽  
Author(s):  
Florian Beenken ◽  
Franz Joos
Keyword(s):  
Gas Turbine ◽  
Flue Gas ◽  
Co2 Sequestration ◽  
Fossil Fuels ◽  
Pressure Ratio ◽  
Electrical Power ◽  
Exhaust Gas ◽  
Power Station ◽  
Flue Gas Recirculation ◽  
Gas Recirculation

In near future electrical power generation will still be supplied by fossil fuels. To reach the targets of the conference on climate change in Paris 2015 one method proposed is the CO2 sequestration and usage or alternatively storage. Compared to coal-fired power station the amount of CO2 in the exhaust gas of gas turbine power station is much less and therefore more difficult to remove. To enhance the efficiency of the CO2-sequestration process enrichment of the CO2 in the exhaust gas could be a solution. This can be achieved by exhaust gas recirculation or by burning with pure O2 instead of air avoiding a lot of N2 in the exhaust gas, called Oxyfuel process. The work concerns to investigations of a reheat gas turbine operating with flue gas recirculation as well as with Oxyfuel operation. The thermodynamic process has been modeled in detail considering the additional demand of cooling of the combustors and the turbines at Oxyfuel process. Additional combustion experiments have been carried out with flue gas recirculation as well as with Oxyfuel conditions burning Natural Gas with O2 in a CO2 environment to investigate the flame stability and extinction limit. The thermophysical properties, like specific heat capacity and sound velocity, are strongly altered by the high content of CO2 and H2O in the fluid of the turbine as well as of the compressor. For example during Oxyfuel conditions the pressure ratio is expected to decrease to about 78% of air operation. The influence of flue gas recirculation and Oxyfuel process to the gas composition as well as to the heat transfer and exit conditions are discussed.

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