Energy Analysis of a Lignite-Fueled Power Plant With a Two-Stage Predrying System

2017 ◽  
Author(s):  
Xin Zhu ◽  
Chang’an Wang ◽  
Chunli Tang ◽  
Defu Che
Keyword(s):  
Power Plant ◽  
Heat Source ◽  
Flue Gas ◽  
Power Plants ◽  
Energy Analysis ◽  
Exhaust Gas ◽  
Two Stage ◽  
Second Stage ◽  
Drying System ◽  
Steam Drying

Performance of lignite-fueled power plants can be improved by predrying the lignite and it is influenced by the characteristics of drying heat source. Heat source for lignite predrying in power plants can be high-temperature flue gas, boiler exhaust gas and extraction steam. Nevertheless, balance point among drying safety, lignite drying degree and drying thermal economy cannot be located using single drying heat source. In this study, a lignite-fueled power plant with a two-stage drying system was proposed. The drying system mainly contains two fluidized bed dryers — the first stage dryer and the second stage dryer. Boiler exhaust gas and extraction steam supply the heat, respectively. The proposed power plant can attain higher lignite drying degree than the power plant in which only boiler exhaust was employed. The new power plant also features higher overall efficiency for the same lignite drying degree compared with extraction steam drying power plant..

scholarly journals Benchmarking Engineering, Procurement and Construction (EPC) Power Plant Projects by Means of Series Two-Stage DEA

Electricity ◽  
2020 ◽  
Vol 1 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Ioannis E. Tsolas
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Combined Cycle ◽  
Operating Efficiency ◽  
Data Envelopment ◽  
Power Sector ◽  
Two Stage ◽  
Second Stage ◽  
Ex Ante ◽  
Open Cycle

A lot of companies in the power sector use Engineering, Procurement, and Construction (EPC) contracts for complex infrastructure projects such as power plants. This paper presents a series two-stage data envelopment analysis (DEA) approach for the ex ante benchmarking of EPC power plant projects. The current study aims to improve over single-stage DEA and evaluate the efficiency of a group of twelve domestic (located in Greece) and international natural gas-fired power plant projects of different technologies (combined cycle power plant (CCPP) projects with single and multi-shaft configuration, and open cycle power plant (OCPP) projects) by employing a series two-stage DEA model. In the first stage, performance of the EPC mode is evaluated, whereas in the second stage the plant annual operational efficiency is assessed. In the light of the results, there is a lower level of performance in the EPC mode than in operating efficiency. The OCPP projects have the best operating efficiency, whereas they are ranked in-between the CCPP projects with single and multi-shaft configuration in EPC mode performance.

A novel lignite pre-drying system integrated with flue gas waste heat recovery at lignite-fired power plants

2019 ◽  
Vol 150 ◽  
pp. 200-209 ◽  
Author(s):  
Min Yan ◽  
Chunyuan Ma ◽  
Qiuwan Shen ◽  
Zhanlong Song ◽  
Jingcai Chang
Keyword(s):  
Flue Gas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Power Plants ◽  
Waste Heat ◽  
Drying System

Thermo-Economic Assessment Under Electrical Market Uncertainties of a Combined Cycle Gas Turbine Integrated With a Flue Gas-Condensing Heat Pump

2020 ◽  
Author(s):  
Alberto Vannoni ◽  
Andrea Giugno ◽  
Alessandro Sorce
Keyword(s):  
Power Plant ◽  
Power Systems ◽  
Gas Turbine ◽  
Heat Pump ◽  
Flue Gas ◽  
Power Plants ◽  
Greenhouse Gas Emission ◽  
Capital Expenditure ◽  
Combined Cycle ◽  
Gas Turbine Power Plant

Abstract Renewable energy penetration is growing, due to the target of greenhouse-gas-emission reduction, even though fossil fuel-based technologies are still necessary in the current energy market scenario to provide reliable back-up power to stabilize the grid. Nevertheless, currently, an investment in such a kind of power plant might not be profitable enough, since some energy policies have led to a general decrease of both the average price of electricity and its variability; moreover, in several countries negative prices are reached on some sunny or windy days. Within this context, Combined Heat and Power systems appear not just as a fuel-efficient way to fulfill local thermal demand, but also as a sustainable way to maintain installed capacity able to support electricity grid reliability. Innovative solutions to increase both the efficiency and flexibility of those power plants, as well as careful evaluations of the economic context, are essential to ensure the sustainability of the economic investment in a fast-paced changing energy field. This study aims to evaluate the economic viability and environmental impact of an integrated solution of a cogenerative combined cycle gas turbine power plant with a flue gas condensing heat pump. Considering capital expenditure, heat demand, electricity price and its fluctuations during the whole system life, the sustainability of the investment is evaluated taking into account the uncertainties of economic scenarios and benchmarked against the integration of a cogenerative combined cycle gas turbine power plant with a Heat-Only Boiler.

scholarly journals Thermal and Economic Analysis of Multi-Effect Concentration System by Utilizing Waste Heat of Flue Gas for Magnesium Desulfurization Wastewater

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5384 ◽  
Author(s):  
Mingwei Yan ◽  
Yuetao Shi
Keyword(s):  
Wastewater Treatment ◽  
Power Plant ◽  
Economic Analysis ◽  
Magnesium Sulfate ◽  
Flue Gas ◽  
Power Plants ◽  
Waste Heat ◽  
Optimization System ◽  
Benchmark System ◽  
Better Than

Compared with limestone-based wet flue gas desulfurization (WFGD), magnesia-based WFGD has many advantages, but it is not popular in China, due to the lack of good wastewater treatment schemes. This paper proposes the wastewater treatment scheme of selling magnesium sulfate concentrate, and makes thermal and economic analysis for different concentration systems in the scheme. Comparisons of different concentration systems for 300 MW power plant were made to determine which system is the best. The results show that the parallel-feed benchmark system is better than the forward-feed benchmark system, and the parallel-feed optimization system with the 7-process is better than other parallel-feed optimization systems. Analyses of the parallel-feed optimization system with 7-process were made in 300, 600, and 1000 MW power plants. The results show that the annual profit of concentration system for a 300, 600, and 1000 MW power plant is about 2.58 million, 5.35 million, and 7.89 million Chinese Yuan (CNY), respectively. In different concentration systems of the scheme for selling magnesium sulfate concentrate, the parallel-feed optimization system with the 7-process has the best performance. The scheme can make a good profit in 300, 600, and 1000 MW power plants, and it is very helpful for promoting magnesia-based WFGD in China.

Analysis on Distribution Law of Damaged Filters for Bag Dedusters in Coal-Fired Power Plants

2013 ◽  
Vol 690-693 ◽  
pp. 1069-1073
Author(s):  
Ying Shuai Zhang ◽  
Ming Feng Xu ◽  
Hui Shen ◽  
Yun Yi Tao
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Power Plants ◽  
Nonuniform Distribution ◽  
Distribution Law ◽  
Operation Optimization ◽  
Improvement Measure

Operating for 1.5 years, part of filtering bags for bag dedusters in a coal-fired power plant had severely decreased intensity and were generally broken. These disabled bags were mainly at the middle and tail of dedusters. By analysis, the reason of the ineffectual filtering bags is oxidation corrosion and more flue gas passing through, owing to the nonuniform distribution of gas. As an improvement measure, such methods are needed as operation optimization, installing de-nitrification system and adding gas uniform plate in dedusters.

Status of and experience with NOx reduction in coal-fired power plants

1997 ◽  
Vol 211 (1) ◽  
pp. 27-41 ◽  
Author(s):  
M Stöhr ◽  
H Schütz ◽  
H Krüger
Keyword(s):  
Air Quality ◽  
Power Plant ◽  
Environmental Impact ◽  
Flue Gas ◽  
Power Plants ◽  
Nox Reduction ◽  
Small Power

Power plant operators in Germany, Europe and other countries are reducing flue gas NOx emissions of large and small power plants to meet air quality regulations for the population and the environment. Beginning with the environmental impact, the use of different techniques for NOx reduction and experience with these techniques is given.

Development Prospects of Non-Thermal Plasma Technology Used in the Thermal Power Plants in China

2009 ◽  
Author(s):  
Bao-Ming Sun ◽  
Shui-e Yin ◽  
Xu-Dong Gao
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Thermal Plasma ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Plasma Technology ◽  
Integration Technology ◽  
Non Thermal Plasma ◽  
Thermal Plasma Technology

This paper mainly seeks to explore and answer some questions for desulfurization and denitration in thermal power plants in China. Firstly, the desulfurization and denitration technology applicated in the power plant in China at present were analyzed. It is considered that taken combination of the existed technique for purified the pollutants from the thermal power plants, not only lead to the wastage of huge amount of investment, increasing of operating costs, decreasing of the economic benefits, but also add an additional area. It is necessary to develop the integration technology of desulfurization and denitration simultaneously. Secondly the integration technology of desulfurization and denitration at present in China was briefly reviewed such as activated carbon adsorption, SNRB, etc. and most of those at a research stage include the plasma technology. In the third of the paper, the non-thermal plasma technology i.e electron-beam technique, corona discharge and dielectric barrier discharge were discussed. Finally, combined with the actual situation in China, the application prospects of the desulfurization and denitration technology using plasma discharge in the flue gas was bring up. The article also pointed out the barriers need to be overcome if the technology will be applied in power plant, as well as the development direction of desulfurization and denitration technology from flue gas in power plant in China.

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.

An integrated lignite pre-drying system using steam bleeds and exhaust flue gas in a 600MW power plant

2016 ◽  
Vol 107 ◽  
pp. 1145-1157 ◽  
Author(s):  
Gang Xu ◽  
Wei Dong ◽  
Cheng Xu ◽  
Qi Liu ◽  
Yongping Yang
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Drying System

Discussion and Analysis on Effect of Hot Secondary Air Governance Gypsum Rain on the Power Plant Unit

2013 ◽  
Vol 864-867 ◽  
pp. 1798-1803 ◽  
Author(s):  
Kun Lu ◽  
Da Wei Chen ◽  
Zhuang Li
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Exhaust Gas ◽  
Coal Consumption ◽  
Hot Air ◽  
Secondary Air

For gypsum rain phenomenon in limestone-gypsum wet desulfurization system. This article made programme that has used unit existing equipment allowance. Extracted hot secondary air to heat purified flue gas to eliminate "gypsum rain". This programme is implemented which makes temperature of purified flue gas rising to 70 °C. That almost eliminate "gypsum rain" phenomenon. While temperature of boiler exhaust gas declined, and temperature of hot air reduced, and boiler thermal efficiency declined, unit of power coal consumption rosed. Comparing to other programmes, this programme has a larger advantage in technology, economic, and security aspects.

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