scholarly journals Experimental study on production and emission characteristics of PM2.5 from industrial fluidized bed boilers

2020 ◽  
Vol 24 (5 Part A) ◽  
pp. 2665-2675
Author(s):  
Songsong Zhang ◽  
Qian Du ◽  
Guoli Qi
Keyword(s):  
Fluidized Bed ◽  
Removal Efficiency ◽  
Mass Concentration ◽  
Great Influence ◽  
Chemical Properties ◽  
Dust Removal ◽  
Dust Collector ◽  
Bag Filter ◽  
Physical And Chemical ◽  
Fluidized Bed Boilers

Particle size distributions, concentrations, morphological characteristics, and elemental compositions of eight fluidized bed boilers with different capacities and different dust collectors were determined experimentally. The PM2.5 particle concentration and mass concentration were monitored in real-time before and after the boiler dust collector by electric low pressure impactor, and the physical and chemical properties of PM2.5 were analyzed by membrane sampling. We found that the PM2.5 particle concentration produced by industrial fluidized bed boilers displayed bimodal distributions, peaking at 0.2 ?m and 0.76 ?m, the formed mechanism of these two parts particles is vaporization-condensation of mineral matter and residual ash particles and the adsorbent wear or tear. Mass concentration exhibits a single peak characteristic with a peak at 0.12 ?m. The removal efficiency for PM2.5 of dust collectors varies with different dust removal mechanisms. The electrostatic precipitator and bag filter have high dust removal efficiency, and the water film dust collector has low dust removal efficiency. The normal operation of the bag filter has a great influence on the dust removal efficiency. The physical and chemical properties of PM2.5 showed that the single-particle morphology was mainly composed of irregular particles, containing a small amount of solid spherical particles and more agglomerates. The content of Si and Al in PM2.5 elemental analysis is the highest, which decreases after a dust collector. Some fluidized bed boilers use desulfurization in the furnace, which has great influence on the mass concentration of Ca and S elements, and the lowest Hg content in trace elements, about a few ppm. <br><br><font color="red"><b> This article has been corrected. Link to the correction <u><a href="http://dx.doi.org/10.2298/TSCI200901242E">10.2298/TSCI200901242E</a><u></b></font>

scholarly journals The Efficiencies of different Dust Collectors and Characteristics of PM2.5 Water-soluble Ions in Industrial Fluidized Bed Boilers

2021 ◽  
Vol 245 ◽  
pp. 03076
Author(s):  
Lin Liang
Keyword(s):  
Fluidized Bed ◽  
Water Soluble ◽  
Dust Collector ◽  
Bag Filter ◽  
Soluble Ions ◽  
Water Soluble Ions ◽  
Before And After ◽  
Removal Efficiencies ◽  
Filter Dust ◽  
Fluidized Bed Boilers

PM2.5 were collected before and after dust collectors of five industrial fluidized bed boilers by PM2.5 sampler. The ELPI was used to monitored the number and mass concentrations of PM2.5 before and after the dust collectors, and the dust removal efficiencies of different dust collectors was analyzed. The efficiencies of electrostatic and bag filter dust collectors are high, and the efficiency of mechanical dust collector is low. NH4+, K+, Mg2+, Ca2+ cations, and F-, Cl-, NO3-, SO42-anions were analyzed by ion chromatography. It was found that the contents of Ca2+ and SO42-were higher in PM2.5 samples, and the contents of Ca2+ and SO42-were different among different boilers, The content of Mg2+ in cations is relatively low, the content of F- in anions is relatively low, and NO3-is not detected in many samples.

scholarly journals Efficiency characteristic of electrostatic dust precipitation using solar energy

2020 ◽  
Vol 24 (5 Part A) ◽  
pp. 2857-2864
Author(s):  
Lin Xu ◽  
Haoyuan Shi ◽  
Lu Wang ◽  
Wenjing Xiao ◽  
Qiong Li ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Electrostatic Precipitator ◽  
Great Influence ◽  
Dust Removal ◽  
Dust Collector ◽  
Solar Photovoltaic ◽  
Electrode Structure ◽  
Cloudy Weather ◽  
Removal Technology ◽  
Dust Precipitator

In this paper, solar photovoltaic technology and electrostatic dust removal technology are combined to design a solar electrostatic precipitator, and its operation effect and dust removal performance are studied. Starting from optimizing the structure of the dust precipitator, the electrode structure of the dust precipitator was improved, the area of dust collector per unit volume was increased, and the dust removal efficiency was improved. By changing different working conditions, different solubility, different voltage, and different dust removal efficiency. Finally, compared the dust removal efficiency of the finned tubular and snowflake dust precipitator. The results show that the snowflake dust precipitator works stably in sunny and cloudy weather, and the dust removal effect is the highest, followed by dry powder, and the cement dust removal effect is the worst. It is determined that the change of voltage within the set range has little influence on the dust removal efficiency, and the dust concentration has a great influence on the dust removal efficiency.

Study on a Photovoltaic Lunar Dust Removal System Based on the Photovoltaic Effect of PLZT

2017 ◽  
Author(s):  
Jing Jiang ◽  
Hong-Yue Zhao ◽  
Jin-Cheng Ding ◽  
Hong-Hao Yue ◽  
Xu-Yan Hou
Keyword(s):  
Ultraviolet Light ◽  
Removal Efficiency ◽  
Electrostatic Force ◽  
Photovoltaic Effect ◽  
Dust Removal ◽  
Dust Collector ◽  
Optical Elements ◽  
Lunar Dust ◽  
Protected Surface ◽  
Removal System

The deposition of lunar dust on the surface of solar panels and optical elements is one of the most important problems need to be solved in lunar exploration. This paper will propose an initiative lunar dust removal system based on the photovoltaic effect of PbLaZrTi (PLZT), which is activated by the ultraviolet light extracted from sun light at the lunar surface. When ultraviolet light with a wavelength near 365nm illuminates on polarized PLZT materials, high voltages of several kilovolt per centimeter can be generated between two electrodes of PLZT. When two electrodes of PLZT are connected to a lunar dust collector (LDC) and the ITO film of protected surface respectively, an electrostatic field forms between LDC and the protected surface. Coulomb forces over particles will overcome gravitational force and surface forces, so the particles can be absorbed to LDC and removed by LDC finally. Based on the equivalent electrical model, mathematical model of electrostatic force is derived when the lunar removal electric field is acted either by single piece PLZT or by multi-pieces PLZT which are connected in parallel. Experimental platform is set up to prove the feasibility of this lunar dust removal system. In order to improve the removal efficiency, a novel configuration design of LDC based on multi-PLZT patched is proposed and its removal efficiency is evaluated by experiments.

scholarly journals Design and Optimum of Dust Collector with Corrugated Plate for Underground Mine

2018 ◽  
Vol 2018 ◽  
pp. 1-5
Author(s):  
Ming Li ◽  
Chao Wu ◽  
Zhi-yong Zhou ◽  
Wei-chun Lian ◽  
Zhi-xiong Chen
Keyword(s):  
Removal Efficiency ◽  
Three Dimensional ◽  
Surface Characteristics ◽  
Dust Removal ◽  
Dust Collector ◽  
Dust Collection ◽  
Ansys Fluent ◽  
Metal Mine ◽  
Lead Zinc ◽  
Dimensional Simulation

A set of dust collectors was designed with corrugated plate for an underground metal mine, which has low ventilation resistance, simple maintenance, and strong environmental adaptability. A three-dimensional simulation model was built based on ANSYS-Fluent software, and it was used to analyze the influence law of key parameters on the comprehensive dust removal efficiency; the angle of corrugated plate to the horizontal plane, the surface characteristics of plate, pressure loss and dust removal efficiency were discussed. The optimal design scheme of the dust collector was determined according to the simulation results. The dust collection was carried out in the Fankou lead-zinc underground metal mine in China, and the total dust removal efficiency was more than 95%, and for respiratory dust, it was more than 85%. This dust collector can be widely used in similar underground metal mines.

Dust Removal Concepts for Pressurized Fluidized Bed Systems

1982 ◽  
Author(s):  
R. R. Boericke ◽  
W. E. Moore
Keyword(s):  
Power Generation ◽  
High Temperature ◽  
Fluidized Bed ◽  
Combined Cycle ◽  
Dust Removal ◽  
Granular Bed ◽  
Bag Filter ◽  
Development Status ◽  
Reference Plant ◽  
System Designs

Improved high-temperature (1700°F, 925°C) dust removal concepts are being developed for pressurized fluidized bed combined cycle power generation. Recent results on cyclones, electrocyclones, an acoustic agglomerator, a ceramic bag filter, and an electrostatic granular bed filter are reviewed. The development status of each device is described, and the relative merits of each concept are discussed. System designs for employing each of the dust removal concepts in a 650 MWe PFB reference plant are presented in order to illustrate the application of the devices, and approximate economic comparisons are made for this application.

Effect of Fluidization Number on the Combustion of Empty Fruit Bunch in a Fluidized Bed

2015 ◽  
Vol 1125 ◽  
pp. 301-305 ◽  
Author(s):  
Anwar Johari ◽  
Tuan Amran Tuan Abdullah ◽  
Mimi Haryani Hassim ◽  
Kamarizan Kidam ◽  
Mohd Johari Kamaruddin ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Operating Temperature ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Empty Fruit Bunch ◽  
Fluidized Bed Combustion ◽  
Bed Height ◽  
Bed Temperature ◽  
Physical And Chemical ◽  
And Chemical Properties

The effect of fluidization number on the sustainability of fluidized bed combustion of empty fruit bunch was investigated. Proximate and ultimate analyses were conducted to determine the physical and chemical properties of empty fruit bunch. Sand mean particle size was determined at 0.34 mm and the sand bed height was set at 1 Dcwhich is equivalent to the diameter of the reactor. Combustion study was carried out in a circular reactor of 0.21 m diameter and operated at stoichiometric condition (Air Factor = 1). The range of fluidization numbers under investigation was from 3 to 8 Umf. The fluidized bed operated in a bubbling mode at operating temperature at about 700°C. Results showed that the most optimum fluidization number was 5 Umfbeing the most optimum with respect to the sustainability of the bed temperature.

scholarly journals Removal of Elemental Mercury from Flue Gas using the Magnetic Attapulgite by Mn-Cu Oxides Modification

2021 ◽  
Author(s):  
Yifei Long ◽  
Zhong He ◽  
Xiaoyi Li ◽  
Yajie Yin ◽  
Yuan Wang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Active Sites ◽  
Chemical Properties ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Impregnation Method ◽  
Active Components ◽  
Co Precipitation ◽  
Physical And Chemical

Abstract Mercury pollution has become one of the most concerned environmental issues in the world because of its high toxicity, non-degradability and bioaccumulation. Attapulgite adsorbents modified by magnetic manganese-copper (MnxCuy-MATP) were fabricated by co-precipitation and ultrasonic impregnation method,aiming at removing Hg0 from coal-fired flue gas. BET, SEM, XRD, VSM and XPS were used to systematically explore the physical and chemical properties of the adsorbents, the effects of manganese and copper additions, reaction temperature and various components in the flue gas on the efficiency of Hg0 removal were investigated. Mn8Cu5-MATP exhibited the optimal properties, and excessive copper loadings led to the aggregation of the active components. The efficiency of mercury removal can be effectively improved by NO and HCl regardless of the absence and presence of O2, because the NO+, NO3, NO2 and Cl* produced during the reaction can promote the adsorption and oxidation of Hg0. SO2 and H2O inhibited the oxidation of Hg0 because of the competitive adsorption at the active sites, while a large amount of sulfite and sulfate were formed to block the pores. However, the introduction of copper caused the sample to obtain SO2 resistance, which resulted in a mercury removal efficiency of 84.3% even under 1500 ppm SO2. In addition, after 5 cycles of adsorption and regeneration, Mn8Cu5-MATP can still maintain excellent Hg0 removal ability. The fabricated adsorbent can save the actual production cost and effectively improve the mercury removal efficiency in sulfur-containing flue gas.

STUDY ON EXPERIMENTAL MODEL TO DETERMINE THE EFFICIENCY OF DUST REMOVAL EQUIPMENT FOR MECHANIC WORKSHOP

2010 ◽  
Vol 13 (3) ◽  
pp. 67-75
Author(s):  
Thang Xuan Dinh ◽  
Trung Thanh Nguyen
Keyword(s):  
Removal Efficiency ◽  
Research Result ◽  
Suitable Method ◽  
Dust Removal ◽  
Small Scale ◽  
Dust Collector ◽  
Particle Removal ◽  
Wet Scrubber ◽  
Cleaning Methods ◽  
Removal Technique

Finding suitable method for selecting the most suitable dust collector for manufacturers is a very important practise which help to reduce environmental pollution and develop a stable society. Based on available research results, the article studies the efficiency of dust removal technique for medium and small scale workshops on three equipments: wet scrubber, wet packed scrubber and centriscrub to suggest suitable dust treatment process in factories as well as the present need. The research result on three equipments suggest that the wet packed scrubber has a minimum particle removal efficiency of 92,67% while the wet scrubber achieving removal efficiency of 81,85% and the Centriscrub achieving removal efficiency up to 99,50%. The results show that the wet cleaning methods is the most suitable method for safe and efficient collection of dusts from various metal working applications such as deburring, polishing and grinding workshop in which the centriscrub achieves the highest efficiency.

Experimental Study of Lanthanum Boride Ceramic Powder Synthesis Process

2013 ◽  
Vol 457-458 ◽  
pp. 135-138
Author(s):  
Fu Jun Wang ◽  
Hui Rong Zhu ◽  
Qi Di Xiu ◽  
Jing Luo
Keyword(s):  
High Purity ◽  
Ceramic Powder ◽  
Great Influence ◽  
Chemical Properties ◽  
Synthesis Process ◽  
Physical And Chemical Properties ◽  
Powder Synthesis ◽  
Physical And Chemical ◽  
Lanthanum Boride ◽  
And Chemical Properties

In this paper, the physical and chemical properties of LaB6 Ceramics are introduced, the influence of fabrication techniques on the microstructure and properties of LaB6 Ceramics are discussed. The combustion synthesis process was considered as the proper method for fabrication of LaB6 Ceramic powder with high purity. The results showed that the control additive has a great influence on the synthesis processand the nanoLaB6 Ceramic powder with high purity can be produced made when the content of the control additive is 30%.

scholarly journals Channel formation in draining suspensions

2018 ◽  
Vol 2 ◽  
pp. 4
Author(s):  
Jeanne Bernard ◽  
Louison Thorens
Keyword(s):  
Fractal Dimension ◽  
Mass Concentration ◽  
Counting Process ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Channel Formation ◽  
Interesting Fact ◽  
Box Counting ◽  
Physical And Chemical ◽  
And Chemical Properties

We analyse how particles adhering to a wall can create tree-like structures (or flat trees) by an erosive flow. We vary the physical and chemical properties of the fluid and highlight their influences on the patterns observed. We analyse the structures created and conclude that the mass concentration in particles have a clear impact. Using the fractal dimension defined by the box-counting process, we prove that the tree-like patterns are fractal objects. An interesting fact is that this fractal dimension remains constant at a fixed height of analysis.

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