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.

scholarly journals Off-Design Dynamic Performance Analysis of a Solar Aided Coal-Fired Power Plant

Energies ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2950
Author(s):  
Vinod Kumar ◽  
Liqiang Duan
Keyword(s):  
Power Plant ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Dynamic Performance ◽  
Feed Water ◽  
Saving Rate ◽  
Coal Consumption ◽  
Dynamic Performance Analysis

Coal consumption and CO2 emissions are the major concerns of the 21st century. Solar aided (coal-fired) power generation (SAPG) is paid more and more attention globally, due to the lesser coal rate and initial cost than the original coal-fired power plant and CSP technology respectively. In this paper, the off-design dynamic performance simulation model of a solar aided coal-fired power plant is established. A 330 MW subcritical coal-fired power plant is taken as a case study. On a typical day, three various collector area solar fields are integrated into the coal-fired power plant. By introducing the solar heat, the variations of system performances are analyzed at design load, 75% load, and 50% load. Analyzed parameters with the change of DNI include the thermal oil mass flow rate, the mass flow rate of feed water heated by the solar energy, steam extraction mass flow rate, coal consumption, and the plant thermal efficiency. The research results show that, as DNI increases over a day, the coal saving rate will also increase, the maximum coal saving rate reaches up to 5%, and plant thermal efficiency reaches 40%. It is analyzed that the SAPG system gives the best performance at a lower load and a large aperture area.

A study on air-cooling waste heat recovery from molten slag of slag-tap boilers

2017 ◽  
Vol 231 (5) ◽  
pp. 371-381
Author(s):  
Lei Deng ◽  
Chunli Tang ◽  
Xiaowen Tan ◽  
Ke Sun ◽  
Song Wu ◽  
...  
Keyword(s):  
Flue Gas ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Molten Slag ◽  
Waste Heat ◽  
Ash Content ◽  
Air Cooling ◽  
Air Preheater ◽  
Hot Air ◽  
Secondary Air

For a better utilization of Zhundong coals which have high fouling and slagging tendency, the slag-tap boiler has attracted much attention. To avoid the high sensible heat loss of discharged molten slag, an air-cooling waste heat recovery system is proposed. Energy and economic analyses are conducted to investigate the effectiveness of heating the desulfurized flue gas by hot air and the influences of partially substituting the secondary air by hot air on heat transfer of air preheater and thermal efficiency of boiler. A case study is performed by referring to a typical 50 MW cyclone boiler with nine types of low fusion temperature coals. The results show that for coals with low ash content, the temperature increment of desulfurized flue gas can be over 7 ℃. While for coals with high ash content, the flue gas temperature can be heated to more than 70 ℃, and the surplus hot air can be sent to the furnace. When the hot air is introduced to partially substitute the secondary air, an instantaneous impact on the air preheater will give rise to a decrement of quantity of heat transferred and increments of temperatures of exit flue gas and hot secondary air. The variations of these thermodynamic parameters become smaller with increasing hot air temperature. After introduction of hot air, the thermal efficiency of boiler can increase, resulting in a decrease of fuel consumption rate. In addition, the heating surface area of air preheater can be reduced.

Dual Receiver Concept for Solar Towers up to 100 MW

2005 ◽  
Vol 128 (3) ◽  
pp. 293-301 ◽  
Author(s):  
M. Eck ◽  
R. Buck ◽  
M. Wittmann
Keyword(s):  
Power Plant ◽  
Power Consumption ◽  
Steam Generator ◽  
Thermal Efficiency ◽  
Heat Exchangers ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Solar Thermal Power ◽  
Hot Air ◽  
Central Receiver

The dual receiver concept presented in this paper improves the adaptation of the central receiver to the steam cycle in a solar thermal power plant. By combination of an open volumetric air heater and a tubular evaporator the dual receiver concept profits from the advantages of these two concepts while their characteristic problems are avoided. The water is evaporated directly in the tubular steam generator; preheating and superheating are done in heat exchangers by using the hot air from the volumetric receiver. This paper presents a concept study that extends previous work on the 10MWel level (Buck et al., 2004, “Dual Receiver Concept for Solar Towers,” Proc. 12th Solar PACES Int. Symposium, Oct. 6–8, Oaxaca, Mexico) to a level of 100MWel, which is the expected power range of future plants. The results confirm the benefits of the new concept, resulting from higher thermal efficiency of the receiver and lower parasitic power consumption. The annual mean efficiency is increased from 13% to 16%. Advantageous are also the reduced thermal loads in the receiver components.

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..

Analysis of Exhausting Flue Gas Temperature Abnormal Accompanied with the Boiler Load Changing

2013 ◽  
Vol 805-806 ◽  
pp. 1836-1842
Author(s):  
Qing Feng Zhang ◽  
Zhen Xin Wu ◽  
Zhen Ning Zhao
Keyword(s):  
Heat Transfer ◽  
Power Plant ◽  
Flue Gas ◽  
Gas Flow ◽  
Thermal Power ◽  
Transfer Principle ◽  
Air Leakage ◽  
Gas Temperature ◽  
Boiler Load ◽  
Hot Air

Based on the heat-transfer principle of air pre-heater, the influence mode of the changes of the air flow, the flue gas flow, the air leakage in different locations, to the temperature of the hot air and the exhausting gas was researched. The problem of a pulverized coal fired boiler, No.2, of a Thermal Power Plant, which the deviation of exhausting flue gas temperature increased to an abnormal extend when the boiler load rise up quickly was analyzed, the fault position and fault reason were located exactly, and the fault was eradicated by equipment maintenance at last. The results of this study have a certain significance to solve similar problems.

Dual Receiver Concept for Solar Towers up to 100MW

Solar Energy ◽  
2005 ◽  
Author(s):  
R. Buck ◽  
M. Eck ◽  
M. Wittmann
Keyword(s):  
Power Plant ◽  
Power Consumption ◽  
Steam Generator ◽  
Thermal Efficiency ◽  
Heat Exchangers ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Solar Thermal Power ◽  
Hot Air ◽  
Central Receiver

The Dual Receiver Concept presented in this paper improves the adaptation of the central receiver to the steam cycle in a solar thermal power plant. By combination of an open volumetric air heater and a tubular evaporator the Dual-Receiver Concept profits from the advantages of these two concepts while their characteristic problems are avoided. The water is evaporated directly in the tubular steam generator, preheating and superheating is done in heat exchangers by using the hot air from the volumetric receiver (Fig. 1). This paper presents a concept study that extends previous work on the 10 MWel level (Buck et al. 2004) to a level of 100 MWel which is the expected power range of future plants. The results confirm the benefits of the new concept, resulting from higher thermal efficiency of the receiver and lower parasitic power consumption. The annual mean efficiency is increased from 13% to 16%. Advantageous are also the reduced thermal loads in the receiver components.

Effects of Different Working Fluid by Using of Waste Heat Obtained from Coal-Fired Units in Organic Rankine Cycles

2014 ◽  
Vol 1070-1072 ◽  
pp. 1790-1793
Author(s):  
Wei Ting Jiang ◽  
Xin Zhao ◽  
Wei Guo Pan ◽  
Xiao Yong Zhang ◽  
Jian Wen Xiong ◽  
...  
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Waste Heat ◽  
Thermodynamic Cycle ◽  
Working Fluid ◽  
Power Ratio ◽  
First Law Of Thermodynamics ◽  
Working Medium ◽  
Organic Rankine Cycles

The characteristics of working medium is one of the important factors for organic Rankine cycle.The study is based on the waste heat of power plant,7 kinds working medium are selected,include R245fa, R600, R600a, R601a, R236fa, R236ea and RC318.ORC's thermodynamic cycle characteristics are calculated based on the first law of thermodynamics,then,compared the thermal efficiency,evaporating pressure and power ratio of different working medium.Results show that R245fa and R601a as the ORC system working medium have higher thermal efficiency and power ratio,and lower evaporating pressure than other five working medium,are ideal organic working medium to recycle flue gas waste heat of power plant.Secondly,R600 as system cycle working medium also has relatively good performance,can be the appropriate choice of working medium.

scholarly journals Sensitivity Analysis of Post Combustion Carbon Capture Using Monoethanolamine (MEA) as a Solvent. A Simulation Study

2020 ◽  
Vol 72 (4) ◽  
pp. 86-98
Author(s):  
Ahmad Hassan ◽  
Usman Ali
Keyword(s):  
Sensitivity Analysis ◽  
Power Plant ◽  
Natural Gas ◽  
Flue Gas ◽  
Carbon Capture ◽  
Energy Requirement ◽  
Co2 Concentration ◽  
Pilot Scale ◽  
Exhaust Gas ◽  
Wide Range

Carbon capturing and storage (CCS) is new technology to remove CO2 from the processes that involve elimination of CO2 as its effect on the environment and incessant increase in temperature of the Earth, makes it interesting as well as most dangerous issue that should be dealt timely to reduce the greenhouse gas emissions. In the present research, the data obtained from the experimental study of CO2 capture pilot plant at the Laboratory of Engineering Thermodynamic in TU Kaiserslautern, Germany, is used for the rate based model validation for different cases using monoethenolamine (MEA) as a solvent. Process simulation sensitivity analysis performed includes a wide range of CO2 concentrations for flue gas of different sources i.e. natural gas fired power plant, exhaust gas recycle and coal based power plant. Results obtained from sensitivity analysis point out the effects of lean loading, stripper pressure, MEA concentration and CO2 concentration in flue gas on energy requirement of reboiler and degree of regeneration using MEA as a solvent for a pilot-scale study. It was found that the specific reboiler duty is least for coal-fired power plant in comparison to the natural gas �fired and exhaust gas recycled power plant, keeping the flow rate of the flue gas constant.

scholarly journals Thermal Performance and Economic Analysis of 210 MWe Coal-Fired Power Plant

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Ravinder Kumar ◽  
Avdhesh Kr. Sharma ◽  
P. C. Tewari
Keyword(s):  
Power Plant ◽  
Economic Analysis ◽  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Thermal Efficiency ◽  
Consumption Rate ◽  
Net Present Value ◽  
Present Value ◽  
Coal Consumption

This paper presents the thermal and economic performance of a 210 MWe coal-fired power plant situated in North India. Analysis is used to predict coal consumption rate, overall thermal efficiency, mass flow rate of steam through boiler, and Net present value (NPV) of plant for given load. Thermodynamic analysis was carried out using mass and energy equations followed by empirical correlations. Predicted mass flow rate of steam, coal consumption rate, and thermal efficiency give fair agreement with plant operating data. The economic analysis includes operational activities such as equipment cost, fuel cost, operations and maintenance cost, revenue, and plant net present value. From economic point of view, the effect of condensate extraction pump redundancy on net present value is observed to be sensitive than boiler feed pump redundancy.

Oxygen Enriched and Oxyfuel Combustion - Promising Trends for Low Carbon Future

2011 ◽  
Vol 145 ◽  
pp. 11-15
Author(s):  
M. Tayyeb Javed ◽  
Bill Nimmo
Keyword(s):  
Flue Gas ◽  
Line Emission ◽  
Combustion Efficiency ◽  
Base Line ◽  
Exhaust Gas ◽  
Low Carbon ◽  
No Emission ◽  
Oxyfuel Combustion ◽  
Test Conditions ◽  
Secondary Air

The escalation of ambient CO2 concentration due excessive use of coal in power generation has put impetus on the development of technologies for utilization of vast and cheap resources available through out the world. Eco-scrub, Oxygen enriched and oxyfuel combustion are among the promising technologies guaranteeing the low carbon future. In our recent investigations, pulverized coal (Russian) was fired in a 20 kW down fired combustion rig under simulated exhaust gas recirculation. The effect of CO2 at burner inlet on the combustion efficiency, flue gas CO2 and NO emission was studied. The test conditions were essentially achieved by replacing the secondary air with a mixture of O2 and CO2 in different proportion. The test conditions do imitate the four key conditions for eco-scrub project. The basic theme under eco-scrub project is to use limited oxygen addition to reduce the volume of flue gas for processing, increase the efficiency of post combustion scrubbing due to higher CO2 levels and reduced the size and cost of post combustion capture. The exhaust gas CO2 was observed to increase linearly with increasing the CO2 at burner inlet. The flue gas concentration for 35% and 45% flue gas recycle was recorded to be 24% and 30% respectively. The NO emission was most of the time under the base line emission of 818 ppm. A maximum of 66% reduction was observed when the burner inlet CO2 was 45% and 21% O2. How ever an increase of 37% was seen when 80% of the secondary air was replaced with a 50%O2-50%CO2 mixture.

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