scholarly journals A Pulverized Coal-Fired Boiler Optimized for Oxyfuel Combustion Technology

10.14311/1588 ◽  
2012 ◽  
Vol 52 (4) ◽  
Author(s):  
Tomáš Dlouhý ◽  
Tomáš Dupal ◽  
Jan Dlouhý
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Gas Flow ◽  
Operating Mode ◽  
Pulverized Coal ◽  
Steam Boiler ◽  
Combustion Technology ◽  
Coal Drying ◽  
Boiler Design ◽  
Gas Recycling

This paper presents the results of a study on modifying a pulverized coal-fired steam boiler in a 250 MWe power plant for oxygen combustion conditions. The entry point of the study is a boiler that was designed for standard air combustion. It has been proven that simply substituting air by oxygen as an oxidizer is not sufficient for maintaining a satisfactory operating mode, not even with flue gas recycling. Boiler design optimization aggregating modifications to the boiler’s dimensions, heating surfaces and recycled flue gas flow rate, and specification of a flue gas recycling extraction point is therefore necessary in order to achieve suitable conditions for oxygen combustion. Attention is given to reducing boiler leakage, to which external pre-combustion coal drying makes a major contribution. The optimization is carried out with regard to an overall power plant conception for which a decrease in efficiency due to CO2 separation is formulated.

High Flue Gas Flow Rate Tests for Removal and Recovery of Carbon Dioxide under Power Plant Effluent Gas Conditions

2004 ◽  
Vol 30 (6) ◽  
pp. 758-761
Author(s):  
Tomio MIMURA ◽  
Yasuyuki YAGI ◽  
Masaki IIJIMA ◽  
Ryuji YOSIYAMA ◽  
Takahito YONEKAWA
Keyword(s):  
Carbon Dioxide ◽  
Power Plant ◽  
Flow Rate ◽  
Flue Gas ◽  
Gas Flow ◽  
Gas Flow Rate ◽  
Power Plant Effluent ◽  
Removal And Recovery

Performance Prediction of High-Temperature CO2 Capture System Utilizing Lithium Silicate for Pulverized Coal-Fired Power Plant

2005 ◽  
Author(s):  
Takao Nakgaki ◽  
Katsuya Yamashita ◽  
Masahiro Kato ◽  
Kenji Essaki ◽  
Takayuki Iwahashi ◽  
...  
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Flue Gas ◽  
Reaction Rate ◽  
Exothermic Reaction ◽  
Significant Loss ◽  
Pulverized Coal ◽  
Lithium Silicate ◽  
Reactor Performance ◽  
Co2 Sorbent

Lithium silicate is a solid CO2-sorbent that can be used repeatedly, and uniquely features absorption of CO2 at temperatures between 500°C and 600°C with an exothermic reaction and regeneration at temperatures above 700°C with an endothermic reaction. This paper introduces the conceptual model and feasibility study of the CO2 capture system utilizing the lithium silicate applicable to a pulverized coal-fired power plant. In this system, assuming a moving bed, the sorbent reactor is installed in a 500MW boiler and absorbs CO2 in the flue gas, and after the absorption process, recirculation of CO2 transports the heat for regeneration. To design the system, unsteady state numerical analysis was used to predict the reactor performance in a 60-minute cycle for absorption and regeneration, which includes the reaction rate based on experimental data. The analysis result indicates that about 20% of CO2 can be captured from flue gas without significant loss in the power generation efficiency.

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.

scholarly journals Enhancement of Technical and Economic Indicators of Power-Generating Units of Thermal Power Plants by Eliminating Flue Gas Recirculation

2021 ◽  
Vol 7 (1) ◽  
pp. 26-31
Author(s):  
Taras Kravets ◽  
◽  
Yevhen Miroshnychenko ◽  
Andrii Kapustianskyi ◽  
◽  
...  
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Gas Flow ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Boiler Furnace ◽  
Short Run ◽  
Boiler Units ◽  
Coal Drying ◽  
Efficiency Indicators

Boiler units at Ukrainian thermal power plants need to be modernized or replaced in the short run, as this is important for the national energy security. The authors determined one of possible ways to improve the efficiency indicators of coal-fired boiler units and power generating units as a whole up to the values exceeding the design ones. This variant of improvement consists in abandoning the technology of using flue gas as drying agent in pulverized coal systems and replacing it with direct discharge of the gas flow into the boiler furnace. Numerous computations were carried out to study the change of efficiency indicators and manoeuvrability of power generating units due to the replacement of the ball mill pulverizing system using flue gases for coal drying with the scheme including ball-and-race mills that use hot air as drying agent.

scholarly journals Efficiency of Installation of an Additional Gas-Air Heat Exchanger When Operating a Steam Boiler on Gas and Liquid Fuel

2021 ◽  
Vol 2096 (1) ◽  
pp. 012011
Author(s):  
F Bakirov ◽  
E Ibragimov
Keyword(s):  
Flue Gas ◽  
Heat Exchangers ◽  
Liquid Fuel ◽  
Fuel Efficiency ◽  
Operating Mode ◽  
Payback Period ◽  
Fuel Oil ◽  
Technical Solution ◽  
Steam Boiler ◽  
Gas Temperature

Abstract The article presents the results of calculating the efficiency of reconstruction of the gas and air paths of a steam boiler when working on gas and liquid fuel due to the installation of additional gas-air heat exchangers. Due to the utilization of the thermal energy of the flue gases in the newly installed heat exchangers, the air is heated in front of the boiler air heaters and the fuel efficiency is increased by increasing the boiler efficiency. The increase in the efficiency of the "gross" boiler during the operation of the considered TGM-84 boiler on fuel oil with an average annual operating mode was 2.81 %. The flue gas temperature after the boiler air heaters was 178 °C, and the air temperature at the inlet to the air heaters was 99 °C at the average annual load of the boiler, which ensures an almost corrosion-free operation of the air heater packing. It is revealed that when the liquid fuel boilers, installation of new heat exchangers and their strapping on the side of the air and flue gas has a shorter payback period than the boiler gas fired. The simple payback period of the considered technical solution was 6,82 years when working on gas fuel and 1,35 years when working on liquid fuel.

scholarly journals Lab-scale investigation of Middle-Bosnia coals to achieve high-efficient and clean combustion technology

2014 ◽  
Vol 18 (3) ◽  
pp. 875-888 ◽  
Author(s):  
Izet Smajevic ◽  
Nihad Hodzic ◽  
Anes Kazagic
Keyword(s):  
Power Plant ◽  
Fluidized Bed ◽  
Environmental Indicators ◽  
Low Grade ◽  
Plant Design ◽  
Fluidized Bed Combustion ◽  
High Efficient ◽  
Combustion Technology ◽  
Boiler Design ◽  
Clean Combustion

This paper describes full lab-scale investigation of Middle-Bosnia coals launched to support selection an appropriate combustion technology and to support optimization of the boiler design. Tested mix of Middle-Bosnia brown coals is projected coal for new co-generation power plant Kakanj Unit 8 (300-450 MWe), EP B&H electricity utility. The basic coal blend consisting of the coals Kakanj: Breza: Zenica at approximate mass ratio of 70:20:10 is low grade brown coal with very high percentage of ash - over 40%. Testing that coal in circulated fluidized bed combustion technique, performed at Ruhr-University Bohum and Doosan Lentjes GmbH, has shown its inconveniency for fluidized bed combustion technology, primarily due to the agglomeration problems. Tests of these coals in PFC (pulverized fuel combustion) technology have been performed in referent laboratory at Faculty of Mechanical Engineering of Sarajevo University, on a lab-scale PFC furnace, to provide reliable data for further analysis. The PFC tests results are fitted well with previously obtained results of the burning similar Bosnian coal blends in the PFC dry bottom furnace technique. Combination of the coals shares, the process temperature and the air combustion distribution for the lowest NOx and SO2 emissions was found in this work, provided that combustion efficiency and CO emissions are within very strict criteria, considering specific settlement of lab-scale furnace. Sustainability assessment based on calculation economic and environmental indicators, in combination with Low Cost Planning method, is used for optimization the power plant design. The results of the full lab-scale investigation will help in selection optimal Boiler design, to achieve sustainable energy system with high-efficient and clean combustion technology applied for given coals.

Numerical Simulation of O2/CO2 Pulverized Coal in 300MW Boiler

2013 ◽  
Vol 732-733 ◽  
pp. 133-137
Author(s):  
Li Li Li ◽  
Chao Qu
Keyword(s):  
Numerical Simulation ◽  
Flue Gas ◽  
Volume Fraction ◽  
Simulation Software ◽  
Pulverized Coal ◽  
Central Position ◽  
Pulverized Coal Boiler ◽  
Combustion Technology ◽  
Secondary Air ◽  
Coal Boiler

O2/CO2combustion technology is an effective method to capture and store coal-fired boiler flue gas CO2. With a 300MW subcritical pulverized coal boiler as the research subject investigated, Fluent numerical simulation software is used to simulate the process of pulverized coal combustion both in air and O2/CO2conditions. The comparative analyses are made both in the former conditions, such as the combustion characteristics of pulverized coal, the influence of oxygen volume fraction, the effect of the secondary air temperature on the temperature field in the furnace of pulverized coal boiler. As for the following results of the pulverized coal combusted in the O2/CO2condition, compared with the results in the air condition, its time of ignition is delayed, and the combustion temperature is low and the central position of flame rises. With the increasing percentage of the oxygen volume and the rising temperature of secondary air, the time of ignition speeds up, which improves the overall furnace temperature level and transferring capability of the radiation heat.

The Discharge Status and Technical Analysis of NOX of Thermal Power Plant Boiler

2014 ◽  
Vol 535 ◽  
pp. 131-134 ◽  
Author(s):  
Dong Yang ◽  
Qing Wen Chen
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Thermal Power Plant ◽  
Catalytic Reduction ◽  
Thermal Power ◽  
Combustion Technology ◽  
Discharge Status ◽  
Low Nox Combustion ◽  
Plant Boiler ◽  
Flue Gas Denitrification

NOXis one of the pollutants which will be key governanced by Government in Twelfth Five, and thermal power plant boiler is the main source of NOXin the atmospheric. Overview of the discharge status of NOXand the state-controlled status of the power plant NOXdischarge regulations with the latest standards, analysis of the current two thermal power plant NOXcontrol technology: low-NOx combustion technology and flue gas denitrification technology. Low NOx combustion technology introduces low excess air combustion technology, air staged combustion technology, flue gas recirculation technology, flue gas denitrification technology introduced four methods which is selective catalytic reduction, selective non-catalytic reduction, hybrid SNCR-SCR catalyst reduction combined metgod and wet NOXabsorption system, principle of denitration and their advantages and disadvantages of different methods are discussed. Finally a brief introduction of the difficulties of governance NOXand some necessary issues when select zhe control methods.

Mercury speciation and its emissions from a 220 MW pulverized coal-fired boiler power plant in flue gas

2007 ◽  
Vol 24 (4) ◽  
pp. 711-715 ◽  
Author(s):  
Xianghua Yang ◽  
Yuqun Zhuo ◽  
Yufeng Duan ◽  
Lei Chen ◽  
Liguo Yang ◽  
...  
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Pulverized Coal ◽  
Mercury Speciation
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