scholarly journals A Compound Cycle for Power Generation by Utilizing Residual Heat of Flue Gas in Electric Steelmaking Process

2020 ◽  
Vol 12 (02) ◽  
pp. 45-58
Author(s):  
Fan Zhang ◽  
Meibo Xing ◽  
Wentao Tang ◽  
Ruixiang Wang
Keyword(s):  
Power Generation ◽  
Flue Gas ◽  
Electric Steelmaking ◽  
Steelmaking Process ◽  
Residual Heat

scholarly journals Modified High Back-Pressure Heating System Integrated with Raw Coal Pre-Drying in Combined Heat and Power Unit

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2487 ◽  
Author(s):  
Heng Chen ◽  
Zhen Qi ◽  
Qiao Chen ◽  
Yunyun Wu ◽  
Gang Xu ◽  
...  
Keyword(s):  
Power Generation ◽  
Flue Gas ◽  
Waste Heat ◽  
Heating System ◽  
Combined Heat And Power ◽  
Back Pressure ◽  
Coal Consumption ◽  
Heating Capacity ◽  
Boiler Efficiency ◽  
Saving Effect

A conceptual high-back pressure (HBP) heating system cooperating raw coal pre-drying for combined heat and power (CHP) was proposed to improve the performance of the HBP-CHP unit. In the new design, besides of heating the supply-water of the heating network, a portion of the exhaust steam from the turbine is employed to desiccate the raw coal prior to the coal pulverizer, which further recovers the waste heat of the exhaust steam and contributes to raising the overall efficiency of the unit. Thermodynamic and economic analyzes were conducted based on a typical 300 MW coal-fired HBP-CHP unit with the application of the modified configuration. The results showed that the power generation thermal efficiency promotion of the unit reaches 1.7% (absolute value) owing to suggested retrofitting, and meanwhile, the power generation standard coal consumption rate is diminished by 5.8 g/kWh. Due to the raw coal pre-drying, the energy loss of the exhaust flue gas of the boiler is reduced by 19.1% and the boiler efficiency increases from 92.7% to 95.4%. The impacts of the water content of the dried coal and the unit heating capacity on the energy-saving effect of the new concept were also examined.

scholarly journals Second Round of Studies on Advanced Power Generation Based on Combined Cycle Using a Single High-Pressure Fluidized Bed Boiler and Consuming Biomass

2012 ◽  
Vol 6 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Marcio L. de Souza-Santos ◽  
Juan Villanueva Chavez
Keyword(s):  
Power Generation ◽  
Fluidized Bed ◽  
Flue Gas ◽  
Gas Turbines ◽  
Sugar Cane Bagasse ◽  
Combined Cycle ◽  
Present Stage ◽  
Added Water ◽  
Preliminary Study ◽  
Process Simulator

Following a preliminary study of power generation processes consuming sugar-cane bagasse; this second round indicates the possibility of almost doubling the current efficiency presently obtained in conventional mills. A combined cycle uses highly pressurized fluidized bed boiler to provide steam above critical temperature to drive steam-turbine cycle while the flue-gas is injected into gas turbines. The present round also shows that gains over usual BIG/GT (Biomass In-tegrated Gasification/Gas Turbine) are very likely mainly due to the practicality of feeding the biomass as slurry that can be pumped into the pressurized boiler chamber. Such would avoid the cumbersome cascade feeding of the fibrous bio-mass, usually required by other processes. The present stage assumes slurry with 50% added water. Future works will concentrate on thicker slurries, if those could be achieved. All studies apply a comprehensive simulator for boilers and gasifiers [CSFMB™ or CeSFaMB™] and a process simulator (IPES) to predict the main features of the steam and gas tur-bine branches.

scholarly journals Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods

Energies ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 998
Author(s):  
Zhiyu Zhang ◽  
Rongrong Zhai ◽  
Xinwei Wang ◽  
Yongping Yang
Keyword(s):  
Power Generation ◽  
Flue Gas ◽  
Consumption Rate ◽  
Orthogonal Design ◽  
Excess Oxygen ◽  
Operating Parameters ◽  
Generation System ◽  
Coal Consumption ◽  
Oxygen Coefficient ◽  
Power Generation System

The main purpose of this paper is to quantitatively analyze the sensitivity of operating parameters of the system to the thermodynamic performance of an oxyfuel combustion (OC) power generation system. Therefore, the thermodynamic model of a 600 MW subcritical OC power generation system with semi-dry flue gas recirculation was established. Two energy consumption indexes of the system were selected, process simulation was adopted, and orthogonal design, range analysis, and variance analysis were used for the first time on the basis of single-factor analysis to conduct a comprehensive sensitivity analysis and optimization research on the changes of four operating parameters. The results show that with increasing oxygen purity, the net standard coal consumption rate first decreases and then increases. With decreasing oxygen concentration, the recirculation rate of dry flue gas in boiler flue gas ( χ 1 ) and an increasing excess oxygen coefficient, the net standard coal consumption rate increases. The net electrical efficiency was just the opposite. The sensitivity order of two factors for four indexes is obtained: the excess oxygen coefficient was the main factor that affects the net standard coal consumption rate and the net electrical efficiency. The influence of oxygen concentration and oxygen purity was lower than that of excess oxygen coefficient, and χ 1 has almost no effect.

scholarly journals How to Construct a Combined S-CO2 Cycle for Coal Fired Power Plant?

Entropy ◽  
2018 ◽  
Vol 21 (1) ◽  
pp. 19 ◽  
Author(s):  
Enhui Sun ◽  
Han Hu ◽  
Hangning Li ◽  
Chao Liu ◽  
Jinliang Xu
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Heat Recovery ◽  
Water Cycle ◽  
Combined Cycle ◽  
Exergy Destruction ◽  
Generation Efficiency ◽  
Air Preheater ◽  
Recompression Cycle ◽  
Residual Heat

It is difficult to recover the residual heat from flue gas when supercritical carbon dioxide (S-CO2) cycle is used for a coal fired power plant, due to the higher CO2 temperature in tail flue and the limited air temperature in air preheater. The combined cycle is helpful for residual heat recovery. Thus, it is important to build an efficient bottom cycle. In this paper, we proposed a novel exergy destruction control strategy during residual heat recovery to equal and minimize the exergy destruction for different bottom cycles. Five bottom cycles are analyzed to identify their differences in thermal efficiencies (ηth,b), and the CO2 temperature entering the bottom cycle heater (T4b) etc. We show that the exergy destruction can be minimized by a suitable pinch temperature between flue gas and CO2 in the heater via adjusting T4b. Among the five bottom cycles, either the recompression cycle (RC) or the partial cooling cycle (PACC) exhibits good performance. The power generation efficiency is 47.04% when the vapor parameters of CO2 are 620/30 MPa, with the double-reheating-recompression cycle as the top cycle, and RC as the bottom cycle. Such efficiency is higher than that of the supercritical water cycle power plant.

Advanced concept of coupling solar-aided flue gas treatment and solar-aided power generation in power plants

2020 ◽  
Vol 203 ◽  
pp. 112026 ◽  
Author(s):  
Yu-Hang Yu ◽  
Shao-Peng Guo ◽  
Yong Hao ◽  
Mao-Bin Hu ◽  
Rui-Lin Wang
Keyword(s):  
Power Generation ◽  
Flue Gas ◽  
Power Plants ◽  
Gas Treatment ◽  
Flue Gas Treatment

Combined Cycle Plants With Frame 9F Gas Turbines

1991 ◽  
Vol 113 (4) ◽  
pp. 475-481 ◽  
Author(s):  
P. Lugand ◽  
C. Parietti
Keyword(s):  
Power Generation ◽  
Flue Gas ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Catalytic Reduction ◽  
Pressure Level ◽  
Combined Cycle ◽  
Size Factor ◽  
Nox Emissions ◽  
Steam Generators

The new 200 MW class MS 9001F gas turbines allow combined cycle plants to reach even higher output levels and greater efficiency ratings. Size factor and higher firing temperatures, with a three-pressure level steam reheat cycle, offer plant efficiencies in excess of 53 percent. Heat recovery steam generators have been designed to accommodate catalytic reduction elements limiting flue gas NOx emissions to as low as 10 ppm VD (15 percent O2). A range of steam turbine models covers the different possible configurations. Various arrangements based on the 350 or 650 MW power generation modules can be optimally configured to the requirements of each site.

scholarly journals Flue gas cleaning for CO2 capture from coal-fired oxyfuel combustion power generation

2011 ◽  
Vol 4 ◽  
pp. 900-907 ◽  
Author(s):  
Jinying Yan ◽  
Marie Anheden ◽  
Richard Faber ◽  
Fredrik Starfelt ◽  
Robert Preusche ◽  
...  
Keyword(s):  
Power Generation ◽  
Co2 Capture ◽  
Flue Gas ◽  
Gas Cleaning ◽  
Oxyfuel Combustion

scholarly journals Next-generation, affordable SO2 abatement for coal-fired power generation - A comparison of limestone-based wet flue gas desulphurization and Sulfacid® technologies for Medupi power station

2020 ◽  
Vol 120 (10) ◽  
Author(s):  
A. Strickroth ◽  
M. Schumacher ◽  
G.W. Hasse ◽  
I. Kgomo
Keyword(s):  
Power Generation ◽  
Sulphuric Acid ◽  
Flue Gas ◽  
Coal Ash ◽  
Poor Quality ◽  
Steam Generation ◽  
So2 Emissions ◽  
Process Technology ◽  
Power Station ◽  
Flue Gas Desulphurization

SYNOPSIS Coal is used to generate more than three-quarters of South Africa's electricity, while numerous coal-fired boilers are employed for steam generation in industrial processes. However, coal-fired power generation is responsible for the release of the largest quantities of SO2 emissions to the atmosphere and leads to detrimental health and welfare effects in communities in the proximity of coal-fired plants. The classical industrial SO2 abatement solution for the coal-fired power generation industry is wet flue gas desulphurization, which uses a limestone adsorbent and produces a gypsum by-product (WFGD L/G). In South Africa, due to the poor quality of the limestone the gypsum product is unsaleable and is co-disposed with coal ash. In comparison, the Sulfacid® process technology converts SO2 contained in industrial flue gas into saleable sulphuric acid using a catalytic process requiring only water and air. This process does not require limestone. The scale of the latest commercial applications of the Sulfacid® SO2 abatement technology in the chemical, fertilizer, and copper mining industries demonstrates the potential and readiness of this technology to be employed in the coal-fired electricity and steam production sectors. This paper provides a first-order direct comparison between the techno-economic aspects of the WFGD (L/G) and Sulfacid® technologies using the requirements specified for the 6 x 800 MWe Eskom coal-fired Medupi power station. The results indicate that affordable flue gas desulphurization technology exists that could be adopted by the South African industry to reduce SO2 emissions to legislative limits and beyond. Keywords: SO2 abatement, coal-fired power, and heat generation, sulphuric acid, wet fluidized gas desulphurization, Sulfacid®, waste-to-chemicals.

Sign in / Sign up

Export Citation Format

Share Document