Research of Improving the Technique of Electrostatic Collection to High Resistivity Dust by Humidifying and Cooling through Ultrasonic Atomization

2014 ◽  
Vol 1010-1012 ◽  
pp. 789-795
Author(s):  
Li Juan Guo ◽  
Wen Ge Hao ◽  
Xiao Zhen Ren ◽  
Kuan Zhang
Keyword(s):  
Flue Gas ◽  
Electrostatic Precipitator ◽  
Specific Resistance ◽  
Dust Removal ◽  
Electrical Heating ◽  
High Resistivity ◽  
Gas Temperature ◽  
Ultrasonic Atomization ◽  
Gas Humidification ◽  
Test Result

In order to study the effect of dust removal in the electrostatic precipitator under the influence of change of temperature and air moisture of flue gas, the ultrasonic atomization and electrical heating has been adopted for simulated gas to change its air moisture and temperature. The specific resistance of fly ash of fluidized bed boiler, the V-j characteristics of the precipitator model and the efficiency of dust removal has been tested in gas working conditions. The measured results of dust specific resistance shows that: when the temperature of gas at range of 100°C to 150°C, the specific resistance of dust was lower when the air moisture is at 23.73% than at 5.21%, especially when the gas temperature is below 120°C, the specific resistance of dust reduce more,and it can reach the orders of magnitude at1010Ω·cm when the moisture of 23.73%; then keep the temperature at 150°C and make the moisture increased, the specific resistance of dust is decreased, however it is still more than 1011Ω·cm when the moisture is increased to 23.73%. The measured results of V-j characteristics of the precipitator model shows that: when the moisture keeps at 23.73% and the temperature is below 120°C, the electric field does not occur the phenomenon of anti-corona. The test result of the efficiency of dust removal indicated that: when we make the moisture increased to 23.73% and the gas temperature below 120°C, the efficiency of dust removal shows a significant increase. The results confirmed that we can improve the purification efficiency of high resistivity dust through flue gas humidification and proper temperature maintain.

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.

Influence of the electrostatic precipitator and the flue gas temperature on concentrations of organic compounds

Chemosphere ◽  
1993 ◽  
Vol 27 (4) ◽  
pp. 547-553 ◽  
Author(s):  
W. Funcke ◽  
A. Hovemann ◽  
P. Luthardt ◽  
E. Manske
Keyword(s):  
Organic Compounds ◽  
Flue Gas ◽  
Electrostatic Precipitator ◽  
Gas Temperature

Experimental Measurement of Flue Gas Temperature Versus Ash Accumulation

2016 ◽  
Author(s):  
Yuetao Shi ◽  
Xiaojuan Wang ◽  
Da Chu ◽  
Fengzhong Sun ◽  
Zhixiong Guo
Keyword(s):  
Sulfuric Acid ◽  
Experimental Measurement ◽  
Flue Gas ◽  
Collection Efficiency ◽  
Dust Removal ◽  
Gas Temperature ◽  
Particle Accumulation ◽  
Temperature And Humidity ◽  
Accumulation Mechanism

It is known that particle accumulation is beneficial for dust removal in industry. In order to understand better particle accumulation mechanism, experiments were carried out to analyze the influence of flue gas temperature and humidity on ash accumulation. It is found that the Engineering Acid Dew Temperature (EADT) of flue gas is an important parameter that determines the efficiency of particle accumulation. When the gas temperature is lower than the EADT, the sulfuric acid in the flue gas and ash humidity rise dramatically, which leads to particle accumulation. In order to improve the collection efficiency, the flue gas temperature can be controlled to trigger particle accumulation.

Research Progress of Pollution Control for Mercury in the Flue Gas from the Coal-Fired Industrial Boilers

2015 ◽  
Vol 737 ◽  
pp. 570-573
Author(s):  
Liang Guo ◽  
Feng Qian ◽  
Jie Miao ◽  
Fan Wang
Keyword(s):  
Flue Gas ◽  
Pollution Control ◽  
Electrostatic Precipitator ◽  
Dust Removal ◽  
Research Progress ◽  
Burning Process ◽  
Coal Burning ◽  
Industrial Boilers ◽  
Ontario Hydro ◽  
At Home

Mercury is one of harmful pollutants during the coal-burning process that can not be ignored. The Ontario-Hydro method, Method 30B and Method 29 are mainly used for sampling the mercury in the flue gas from the coal-fired industrial boilers. This article studied the control ability of the mercury by the electrostatic precipitator (ESP), wet flue gas device (WFGD) and the dust removal and desulfurization integration at home and abroad.

scholarly journals Modification and Application of Low and Low Temperature Economizer in Dezhou Power Plant

2021 ◽  
Vol 271 ◽  
pp. 01022
Author(s):  
Qiudong Hu
Keyword(s):  
Power Plant ◽  
Low Temperature ◽  
Flue Gas ◽  
Power Plants ◽  
Waste Heat ◽  
National Policy ◽  
Dust Removal ◽  
Gas Temperature ◽  
Coal Consumption ◽  
Waste Heat Recovery System

At present, the exhaust gas temperature of coal-fired power plants is 125-150℃, and the emission of high-temperature flue gas causes the loss of excess heat and wastes. For this kind of phenomenon, the waste heat recovery system is researched and designed, combined with the combination of a low-temperature economizer in a coal-fired power plant in Dezhou. The heater, through the low-temperature economizer combined with the heater system, reduces coal consumption for power generation, reduces flue gas emissions, while reducing dust specific resistance, improving dust removal efficiency of electric dust removal, and reducing dust emissions. This project responds to national policy guidelines.

Performance Analysis of a New Type Economizer System for Active Control of Exhaust Flue Gas Temperature in a 600 MW Power Plant

2017 ◽  
Author(s):  
Pengcheng Xiao ◽  
Jizhou Wang ◽  
Yanping Zhang
Keyword(s):  
Performance Analysis ◽  
Active Control ◽  
Flue Gas ◽  
Electrostatic Precipitator ◽  
Calculation Model ◽  
Exhaust Gas ◽  
Gas Temperature ◽  
New Type ◽  
Exhaust Gas Temperature ◽  
Gas Ratio

A new type of bypass staged economizer system is presented in this paper. The calculation model of the bypass staged economizer and ordinary LPE were established based on a 600 MW unit. The performance analysis for important operating parameters of the presented economizer system such as exhaust gas temperature and bypass flue gas ratio are carried out. Simulation results showed that, when the scheme of the bypass staged economizer was adopted, the temperature of the flue gas entering the electrostatic precipitator (ESP) can be reduced to 95°C, which can greatly improve unit efficiency, reduce standard coal equivalent (SCE) consumption by 2.8g/kWh. Compared with the traditional LPE, it can reduce SCE consumption by 1.59g/kWh. In addition, the technology can also achieve the active control of the exhaust flue gas temperature by changing the bypass flue gas ratio. The different flue gas temperatures correspond to different bypass flue gas ratios. And the optimum bypass flue gas ratio was calculated in different exhaust gas temperature conditions.

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.

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