Numerical Simulation and Optimization on the Variable Oxygen of a 3000 T/H Ultra-Supercritical Boiler

2013 ◽  
Vol 291-294 ◽  
pp. 1675-1678
Author(s):  
Ling Da Zeng ◽  
Zhong Guang Fu ◽  
Han Cai Zeng
Keyword(s):  
Flue Gas ◽  
Thermal Load ◽  
Rate Increase ◽  
Research Result ◽  
Combustion Efficiency ◽  
Gas Temperature ◽  
Combustion Heat ◽  
Simulation And Optimization ◽  
Burnout Rate ◽  
Direction Information

The characteristics of flow,combustion,heat transfer and NOx emission were numerically investigated under the different load operation for a 3000 T/H ultra-supercritical boiler.The simulated results agree well with the measured values. The results show that there is significant influence when oxygen amount in flue gas is different. The results show that compared with the increase of oxygen,coal burnout rate increase,fly ash carbon content is reduced,combustion efficiency is raised,and NOx emissions is reduced greatly,the flue gas temperature is reduced greatly chamber exports,which helps reduce panel superheater hang the tendency of slag,wall maximum thermal load obvious move down to middle burner and the lower between the burner area,boiler oxygen best in between 3.0 and 3.5.The direction information can be provided for mastering the combustion characteristics of this type of boiler,adjusting and optimizing the operation by the research result.

Optimal Simulation on the Variable Load for an Ultra-Supercritical Boiler

2013 ◽  
Vol 291-294 ◽  
pp. 1679-1683
Author(s):  
Ling Da Zeng ◽  
Zhong Guang Fu ◽  
Han Cai Zeng
Keyword(s):  
Flue Gas ◽  
Thermal Load ◽  
Rate Increase ◽  
Research Result ◽  
Variable Load ◽  
Nox Emissions ◽  
Gas Temperature ◽  
Combustion Heat ◽  
Burnout Rate ◽  
Direction Information

The characteristics of flow, combustion, heat transfer and NOx emission were numerically investigated under the different load operation for an 1000MW ultra-supercritical swirling opposed coal-fired utility boiler.The simulated results agree well with the measured values. The results show that compared with 100% load all 6 mills in service, 70% load 4 mills is running, pulverized coal burnout rate increase, fly ash carbon content is reduced and NOx emissions reduced greatly, the flue gas temperature is reduced greatly chamber exports, which helps reduce panel superheater hang the tendency of slag, wall maximum thermal load obvious move down to middle burner and the lower between the burner area. The direction information can be provided for mastering the combustion characteristics of this type of boiler, adjusting and optimizing the operation by the research result.

Study on the Technology of Increasing Combustion Efficiency and Decreasing NOx Emission of Blending Coals

2012 ◽  
Vol 614-615 ◽  
pp. 41-44 ◽  
Author(s):  
Chun Zhi Wei ◽  
Yi Cong Wang
Keyword(s):  
Combustion Chamber ◽  
Flue Gas ◽  
Coal Combustion ◽  
Thermal Load ◽  
Load Distribution ◽  
Combustion Efficiency ◽  
Pollutant Emission ◽  
Gas Temperature ◽  
Emission Properties ◽  
Different Types

Study on the combustion behavior and pollutant emission properties of the different types and different ratio of blending coal have been done. The influence of the ratio of brown-blending coal on the combustion efficiency and NOx emission have been researched and concentrated ratio and method of pulverized coal have been get. The thermal-load distribution along the height of furnace and the control of the flue gas temperature at the exit of the combustion chamber have been discussed and the retrofit schema has been put forward. By reasonably blending coal, combustion efficiency increases and NOx emission goes down.

NOx process inhibition and energy efficiency improvement in new swirl modification device for steel slag based on coal combustion

2018 ◽  
Vol 16 (7) ◽  
Author(s):  
Junxiang Guo ◽  
Lingling Zhang ◽  
Daqiang Cang ◽  
Liying Qi ◽  
Wenbin Dai ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Flue Gas ◽  
Coal Combustion ◽  
Steel Slag ◽  
Coal Ash ◽  
Combustion Efficiency ◽  
Gas Temperature ◽  
Staged Combustion ◽  
Energy Efficiency Improvement ◽  
Swirl Combustion

Abstract In this study, a novel swirl combustion modified device for steel slag was designed and enhanced with the objective of achieving highly efficient and clean coal combustion and also for achieving the whole elements utilization of coal. Coal ash and steel slag were melted in the combustion chamber and subsequently entered the slag chamber. The detrimental substances solidified and formed crystals, which allowed for the comprehensive utilization of the ash and slag. Our experiments mainly aimed to mitigate the formation of NOx, while using the heat and slag simultaneously during the coal combustion without a combustion efficiency penalty. The increase in the device’s energy efficiency and reduction in the NOx emissions are important requirements for industrialization. The experiments were carried out in an optimized swirling combustion device, which had a different structure and various coal feeding conditions in comparison to previously reported devices. The fuel-staged and non-staged combustion experiments were compared under different coal ratios (bitumite:anthracite). For the fuel-staged combustion experiments, the NOx concentration in the flue gas was observed to decrease significantly when the coal ratio of 1:1, an excess air coefficient of 1.2, and a fuel-staged ratio of 15:85 were used. Under these conditions, the flue gas temperature was as high as 1,620°C, while the NOx concentration was as low as 320 mg/m3 at 6 % O2. The air-surrounding-fuel structure that formed in the furnace was very beneficial in reducing the formation of NOx. In comparison to other types of coal burners, the experimental combustion device designed in this study achieved a significant reduction of NOx emissions (approximately 80 %).

scholarly journals Reliable simple zonal method of the furnace thermal calculation

2005 ◽  
Vol 9 (2) ◽  
pp. 45-55
Author(s):  
Vladan Ivanovic
Keyword(s):  
Energy Consumption ◽  
Flue Gas ◽  
Thermal Load ◽  
Operating Conditions ◽  
Thermal Calculation ◽  
Gas Temperature ◽  
Zonal Method ◽  
One Dimensional ◽  
Furnace Performance ◽  
Steam Boilers

The calculation of the furnace in the industrial and power boilers is the most important and the most responsible part of the thermal calculation, and it has important influence on the rationalization of energy consumption. In the paper one-dimensional zonal method of the furnace thermal calculation of steam boilers is presented. It can successfully define disposition of flue gas temperature and specific thermal load of screen walls with height of the furnace in case of uneven deposits distribution which vary in size and quality. Its greatest use is for comparing furnace performance under various operating conditions.

A Theoretical Analysis of Predrying of Solid Fuels With Flue Gas

1988 ◽  
Vol 110 (2) ◽  
pp. 119-123 ◽  
Author(s):  
C. M. Kinoshita
Keyword(s):  
Moisture Content ◽  
Flue Gas ◽  
Air Entrainment ◽  
Combustion Efficiency ◽  
Solid Fuels ◽  
Fuel Moisture ◽  
Gas Temperature ◽  
Ambient Conditions ◽  
Dimensionless Parameters ◽  
Fuel Moisture Content

Combustion efficiency and flue-gas drying of solid fuels are analyzed. A simple, universal arithmetic expression for combustion efficiency is developed. This expression involves four primary dimensionless parameters which relate to (and are fixed for given) fuel and ambient conditions, and three secondary dimensionless parameters which relate to (and vary with) fuel moisture content, excess air, and flue-gas temperature. Additional expressions involving the same primary parameters are developed to calculate the decrease in fuel moisture content due to flue-gas drying with and without entrainment of air into the dryer system and the decrease in flue-gas temperature with air entrainment. Values for the four primary parameters are presented for various fuels; their values do not vary much for most biomass fuels.

Numerical Research of Inlet Temperatures Influence on Combustion Characteristics in Micro Gas Tuebine's Oxygen Enriched Combustor

2014 ◽  
Vol 494-495 ◽  
pp. 701-705
Author(s):  
Fu Zhen Wang ◽  
Shi Liu ◽  
Ji Xu Shao ◽  
Xiao Chen Ren
Keyword(s):  
Flue Gas ◽  
Combustion Efficiency ◽  
Combustion Characteristics ◽  
Outlet Temperature ◽  
Gas Temperature ◽  
Recovery Coefficient ◽  
Uniformity Coefficient ◽  
Efficiency Increase ◽  
Temperature Combustion ◽  
Numerical Research

Keeping exhaust gas temperature constant in oxygen enriched and flue gas circulating Micro Gas Turbine, Numerical Research is carried on to study inlet temperatures influence on combustion characteristics. Simulation shows that along with increase of methanes temperature, combustion efficiency increase slightly, uniformity coefficient of outlet temperature decreases, total pressure recovery coefficient decreases, content of carbon monoxide and methane in outlet gas decrease. However, when inlet methanes temperature exceed 100 °C, content of NOx increase rapidly in flue gas. The simulation result supplied reference for design of oxygen enriched and flue gas circulating combustor.

scholarly journals Low-Cost Organic Adsorbents for Elemental Mercury Removal from Lignite Flue Gas

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2174
Author(s):  
Marta Marczak-Grzesik ◽  
Stanisław Budzyń ◽  
Barbara Tora ◽  
Szymon Szufa ◽  
Krzysztof Kogut ◽  
...  
Keyword(s):  
Flue Gas ◽  
Low Cost ◽  
Elemental Mercury ◽  
Mercury Content ◽  
Flue Gases ◽  
Mercury Removal ◽  
Gas Purification ◽  
Gas Temperature ◽  
Corn Straw ◽  
Flue Gas Purification

The research presented by the authors in this paper focused on understanding the behavior of mercury during coal combustion and flue gas purification operations. The goal was to determine the flue gas temperature on the mercury emissions limits for the combustion of lignites in the energy sector. The authors examined the process of sorption of mercury from flue gases using fine-grained organic materials. The main objectives of this study were to recommend a low-cost organic adsorbent such as coke dust (CD), corn straw char (CS-400), brominated corn straw char (CS-400-Br), rubber char (RC-600) or granulated rubber char (GRC-600) to efficiently substitute expensive dust-sized activated carbon. The study covered combustion of lignite from a Polish field. The experiment was conducted at temperatures reflecting conditions inside a flue gas purification installation. One of the tested sorbents—tire-derived rubber char that was obtained by pyrolysis—exhibited good potential for Hg0 into Hg2+ oxidation, resulting in enhanced mercury removal from the flue. The char characterization increased elevated bromine content (mercury oxidizing agent) in comparison to the other selected adsorbents. This paper presents the results of laboratory tests of mercury sorption from the flue gases at temperatures of 95, 125, 155 and 185 °C. The average mercury content in Polish lignite was 465 μg·kg−1. The concentration of mercury in flue gases emitted into the atmosphere was 17.8 µg·m−3. The study analyzed five low-cost sorbents with the average achieved efficiency of mercury removal from 18.3% to 96.1% for lignite combustion depending on the flue gas temperature.

The Energy-Saving Optimization of the Organic Heat Transfer Material Heater

2012 ◽  
Vol 455-456 ◽  
pp. 284-288
Author(s):  
Wei Li Gu ◽  
Jian Xiang Liu
Keyword(s):  
Heat Transfer ◽  
Energy Saving ◽  
Flue Gas ◽  
Theoretical Basis ◽  
Operation Management ◽  
Exergy Loss ◽  
Irreversible Processes ◽  
Design Parameters ◽  
Gas Temperature

this paper studies the typical irreversible processes such as combustion and heat transfer with temperature difference based on the theory of thermodynamics, analyzes the influencing factors on exergy loss in irreversible processes, on the basis of this analysis, proposes the energy-saving optimization measures on design and operation management of the organic heat transfer material heater, and specially points out that in the design process, objective function can be constructed with the exergy loss as evaluation index to determine the outlet flue gas temperature of furnace and the flue gas temperature, and provides theoretical basis for the determination of design parameters.

Numerical simulation and field test study of desulfurization wastewater evaporation treatment through flue gas

2014 ◽  
Vol 70 (7) ◽  
pp. 1285-1291 ◽  
Author(s):  
Jia-jia Deng ◽  
Liang-ming Pan ◽  
De-qi Chen ◽  
Yu-quan Dong ◽  
Cheng-mu Wang ◽  
...  
Keyword(s):  
Field Test ◽  
Flue Gas ◽  
Cfd Simulation ◽  
Electrostatic Precipitator ◽  
Negative Impact ◽  
Positive Impact ◽  
Field Tests ◽  
Gas Temperature ◽  
Simulation Results ◽  
Desulfurization Wastewater

Aimed at cost saving and pollution reduction, a novel desulfurization wastewater evaporation treatment system (DWETS) for handling wet flue gas desulfurization (WFGD) wastewater of a coal-fired power plant was studied. The system's advantages include simple process, and less investment and space. The feasibility of this system has been proven and the appropriate position and number of nozzles, the spray droplet size and flue gas temperature limitation have been obtained by computational fluid dynamics (CFD) simulation. The simulation results show that a longer duct, smaller diameter and higher flue gas temperature could help to increase the evaporation rate. The optimal DWETS design of Shangdu plant is 100 μm droplet sprayed by two nozzles located at the long duct when the flue gas temperature is 130 °C. Field tests were carried out based on the simulation results. The effects of running DWETS on the downstream devices have been studied. The results show that DWETS has a positive impact on ash removal efficiency and does not have any negative impact on the electrostatic precipitator (ESP), flue gas heat exchanger and WFGD. The pH values of the slurry of WFGD slightly increase when the DWETS is running. The simulation and field test of the DWETS show that it is a feasible future technology for desulfurization wastewater treatment.

Study on Mechanism of Flue Gas Desulfuration by Using Liquid-Phase Biochemical Method

2011 ◽  
Vol 356-360 ◽  
pp. 1556-1560
Author(s):  
Zhi An Liu ◽  
Ying Chang ◽  
Peng Wang ◽  
Jlan Jun Jia ◽  
Qi Wang Liu
Keyword(s):  
Flue Gas ◽  
Rate Increase ◽  
The Self ◽  
Inlet Concentration ◽  
Critical Factors ◽  
Biochemical Method ◽  
Solution Ph ◽  
Flue Gas Desulfuration ◽  
Increasing Temperature ◽  
Flue Gas Desulphurization

Wet Biochemical Flue Gas Desulphurization technique (WB-FGD) is combined both catalyst of transition metal with microbial metabolize to achieve flue gas desulphurization. In the self-designed device of power plant flue gas desulphurization, study the desulphurization kinetics according to the absorption solution pH, Fe3+concentration, inlet concentration of SO2, temperature and other factors. The results show that: Concentration of Fe3+is the most critical factors in the desulphurization process, the desulphurization efficiency is decreased with the increasing of Fe3+concentration, which in the range of 0~0.01mol·L-1, and the desulphurization efficiency do not change significantly with the further increasing of the concentration of Fe3+.the desulphurization efficiency is decreased with the increasing concentration of H+when pH of the solution in the range of 1.5~3.5. The efficiency of desulphurization decrease with the increasing concentration of SO2, which in the range of 1145-3432mg·L-1. The oxidation rate increase with the increasing temperature at 20~40°C.The kinetic equation and controllable parameters of changes of Fe3+concentration are obtained according to the experimental data in WB-FGD.

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