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.

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.

Flue-Gas Desulfurization Technology and its Equipment

2013 ◽  
Vol 788 ◽  
pp. 466-470 ◽  
Author(s):  
Hui Di Hao ◽  
Tian Zhai ◽  
Yong Fang Zhang ◽  
Jian Yong Lei ◽  
Tian Qi Cheng ◽  
...  
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Thermal Power Plant ◽  
Rapid Development ◽  
Thermal Power ◽  
Electric Energy ◽  
Flue Gases ◽  
Flue Gas Desulfurization ◽  
Control Technology ◽  
Main Component

The peak of power consumption will be brought by the rapid development of the industry. Thermal power is still the main component of electric energy at present. More and more attention has been paid on the atmospheric pollution caused by the thermal power plant in our country. The sulfur dioxide (SO2), one of the thermal power plant flue gases, is dangerous to the environment and human. Effective SO2 control technology can not only reduce the environmental pollution but also the sulfur can be recovered in order to conserve resources.

scholarly journals CFD ANALYSIS OF ECONOMIZER IN A TENGENTIAL FIRED BOILER

2013 ◽  
pp. 143-147
Author(s):  
KRUNAL P. MUDAFALE ◽  
HEMANT S. FARKADE
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Large Scale ◽  
Thermal Power ◽  
Three Dimensional ◽  
Geometrical Model ◽  
Gas Temperature ◽  
Three Dimensional Model ◽  
The Individual ◽  
Side Flow

This paper presents a simulation of the economizer zone, which allows for the condition of the shell-side flow and tube-side and tube-wall, thermal fields, and of the shell-tube heat-exchange. Selection of the economizer zone from the thermal power plant only because, it is found trends of failure that the economizer is the zone where the leakages are found more. The maximum number of cause of failure in economizer unit is due to flue gas erosion. The past failure details revels that erosion is more in U-bend areas of Economizer Unit because of increase in flue gas velocity near these bends. But it is observed that the velocity of flue gases surprisingly increases near the lower bends as compared to upper ones. The model is solved using conventional CFD techniques by STAR- CCM+ software. In which the individual tubes are treated as sub-grid features. A geometrical model is used to describe the multiplicity of heat-exchanging structures and the interconnections among them. The Computational Fluid Dynamics (CFD) approach is utilised for the creation of a three-dimensional model of the economizer coil. With equilibrium assumption applied for description of the system chemistry. The flue gas temperature, pressure and velocity field of fluid flow within an economizer tube using the actual boundary conditions have been analyzed using CFD tool. Such as the ability to quickly analyse a variety of design options without modifying the object and the availability of significantly more data to interpret the results. This study is a classic example of numerical investigation into the problem of turbulent reacting flows in large scale furnaces employed in thermal power plants for the remediation of ash deposition problems. And the experimental setup is from Chandrapur Super Thermal Power Station, Chandrapur having the unit no IV of 210 MW energy generations.

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 Exergy efficiency analysis of lignite-fired steam generator

2018 ◽  
Vol 22 (5) ◽  
pp. 2087-2101
Author(s):  
Drenusha Krasniqi-Alidema ◽  
Risto Filkoski ◽  
Marigona Krasniqi
Keyword(s):  
Steam Generator ◽  
Flue Gas ◽  
Power Plants ◽  
Thermal Power ◽  
Calorific Value ◽  
Feed Water ◽  
Low Grade ◽  
Gas Temperature ◽  
Steam Generators ◽  
Energy And Exergy

The operation of steam generators and thermal power plants is commonly evaluated on a basis of energy analysis. However, the real useful energy loss cannot be completely justified only by the First law of thermodynamics, since it does not differentiate between the quality and amount of energy. The present work aims to give a contribution towards identification of the sources and magnitude of thermodynamic inefficiencies in utility steam generators. The work deals with a parallel analysis of the energy and exergy balances of a coal-fired steam generator that belongs to a 315 MWe power generation unit. The steam generator is de-signed for operation on low grade coal - lignite with net calorific value 6280 to 9211 kJ/kg, in a cycle at 545?C/177.4 bar, with feed water temperature 251?C, combustion air preheated to 272?C and outlet flue gas temperature 160?C. Since the largest exergy dissipation in the thermal power plant cycle occurs in the steam generator, energy, and exergy balances of the furnace and heat exchanging surfaces are established in order to identify the main sources of inefficiency. On a basis of the analysis, optimization of the combustion and heat transfer processes can be achieved through a set of measures, including retrofitting option of lignite pre-drying with flue gas and air preheating with dryer exhaust gases.

The Use of Technogenic Waste to Clean the Flue Gases of Thermal Devices from Harmful Substances

2019 ◽  
Vol 23 (6) ◽  
pp. 4-7
Author(s):  
A.M. Pogodaev ◽  
A.F. Shimansky ◽  
Yu.I. Storozhev ◽  
Ya.V. Kazantsev ◽  
V.S. Zlobin
Keyword(s):  
Sulfur Dioxide ◽  
Flue Gas ◽  
Power Plants ◽  
Thermal Power ◽  
Fixed Bed ◽  
Flue Gases ◽  
Alumina Production ◽  
Laboratory Installation ◽  
Gas Cleaning ◽  
Industrial Experiments

The thermodynamics of the process of calcium sulfate decomposition is considered. An adsorbent for cleaning flue gases from sulfur dioxide in the form of sludge from alumina production is proposed. Conducted semi-industrial experiments on cleaning the flue gases of small thermal power plants and boiler houses from sulfur dioxide using a laboratory installation. Established high (more than 90%) the effectiveness of the proposed adsorbent. The unique possibility of flue gas cleaning from nitrogen oxides of thermal devices using lignite fuel is revealed. A scheme of sequential flue gas cleaning in a suspended and fixed bed of the adsorbent is proposed.

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.

Forecasting of Fouling in Air Pre-Heaters Through Deep Learning

2021 ◽  
Author(s):  
Ashit Gupta ◽  
Vishal Jadhav ◽  
Mukul Patil ◽  
Anirudh Deodhar ◽  
Venkataramana Runkana
Keyword(s):  
Deep Learning ◽  
Power Plants ◽  
Short Term Memory ◽  
Catalytic Reduction ◽  
Thermal Power ◽  
Differential Pressure ◽  
Operating Conditions ◽  
Flue Gases ◽  
Gas Temperature ◽  
Sulphur Oxides

Abstract Thermal power plants employ regenerative type air pre-heaters (APH) for recovering heat from the boiler flue gases. APH fouling occurs due to deposition of ash particles and products formed by reactions between leaked ammonia from the upstream selective catalytic reduction (SCR) unit and sulphur oxides (SOx) present in the flue gases. Fouling is strongly influenced by concentrations of ammonia and sulphur oxide as well as the flue gas temperature within APH. It increases the differential pressure across APH over time, ultimately leading to forced outages. Owing to lack of sensors within APH and the complex thermo-chemical phenomena, fouling is quite unpredictable. We present a deep learning based model for forecasting the gas differential pressure across the APH using the Long Short Term Memory (LSTM) networks. The model is trained and tested with data generated by a plant model, validated against an industrial scale APH. The model forecasts the gas differential pressure across APH within an accuracy band of 5–10% up to 3 months in advance, as a function of operating conditions. We also propose a digital twin of APH that can provide real-time insights into progression of fouling and preempt the forced outages.

scholarly journals Peculiarities of using slurry fuels in thermal power plants

2019 ◽  
Vol 23 (3 Part B) ◽  
pp. 2047-2057
Author(s):  
Sergey Shevyrev ◽  
Aleksandr Bogomolov ◽  
Ksenia Vershinina ◽  
Timur Valiullin ◽  
Geniy Kuznetsov ◽  
...  
Keyword(s):  
Power Plant ◽  
Flue Gas ◽  
Power Plants ◽  
Water Cycle ◽  
Thermal Power ◽  
Flue Gas Desulfurization ◽  
Thermodynamic Efficiency ◽  
Closed Water ◽  
Plant Efficiency ◽  
Transition Heat

The study regards the issues of increasing the thermodynamic efficiency of a typical condensing thermal power plant using coal-water and organic coal-water fuels as the main source. The attention is paid to the use of the phase transition heat of the water vapor of the flue gas. We have shown that it is possible to increase the power plant efficiency by about 3.7% (gross) relative to the base value (in the case of using pulverized coal). We propose to use the flue-gas desulfurization technology for creating fuel slurries in which a liquid incombustible base will be replaced, for example, with aqueous solutions of Ca(OH)2. This will create a closed water cycle, improve the efficiency of Sox flue gas purification and improve the performance of scrubbers.

scholarly journals Modified sludge-based purification of flue gases produced by thermal power plants

2020 ◽  
Vol 216 ◽  
pp. 01082
Author(s):  
Elvira Khusnutdinova ◽  
Larisa Nikolaeva
Keyword(s):  
Water Treatment ◽  
Power Plant ◽  
Sulfur Dioxide ◽  
Power Plants ◽  
Thermal Power ◽  
Flue Gases ◽  
Water Treatment Sludge ◽  
Kinetic Dependence ◽  
Sorption Material ◽  
Chemical Water

This paper proposes an adsorption-based method of removing sulfur dioxide from the flue gases produced by the thermal power plant. A power plant waste – chemical water treatment sludge available at Kazan CHPP-1 – was used as an adsorption material. Presented here is the chemical composition of the chemical water treatment sludge for a modified sorption material to be designed therefrom. The new sorp-tion material was trial tested for removal of sulfur dioxide from gases. This resulted in kinetic dependence and adsorption isotherm. The test results were then used to design the adsorber. The economic and envi-ronmental effect of using the chemical water treatment sludge as the sorption material was calculated.

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