Influence of bag filter ash to spectral thermal radiation in fluidized bed combustors Co-Fired with biomass

2021 ◽  
Vol 167 ◽  
pp. 107012
Author(s):  
Mehmet Soner Yasar ◽  
Nevin Selçuk ◽  
Gorkem Kulah
Keyword(s):  
Thermal Radiation ◽  
Fluidized Bed ◽  
Bag Filter

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>

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.

scholarly journals INCORPORATION OF A TWO-FLUX MODEL FOR RADIATIVE HEAT TRANSFER IN A COMPREHENSIVE FLUIDIZED BED SIMULATOR PART I: PRELIMINARY THEORETICAL INVESTIGATIONS

2003 ◽  
Vol 2 (1) ◽  
pp. 64 ◽  
Author(s):  
J. A. Rabi ◽  
M. L. De Souza Santos
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Thermal Radiation ◽  
Fluidized Bed ◽  
Radiative Heat ◽  
Radiation Heat Transfer ◽  
Basic Structure ◽  
Solid Particles ◽  
Particulate Media ◽  
Bubbling Fluidized Bed

Over the last two decades, a comprehensive mathematical model and its corresponding computational program, aimed to simulate steady-state operations of bubbling fluidized bed equipments, has been continuously improved and tested. Despite its success, the simulator has employed a simple approach for radiative heat transfers. In cases of high temperatures, thermal radiation becomes an important energy transfer mode and the original model could lead to deviations above acceptable levels. The purpose of the present work was to improve the model for thermal radiation heat transfer between all solid particles in the bed section by applying a two-flux method to a non-homogeneous polydispersed particulate media in radiative equilibrium. Gases in the emulsion and in the bubbles were assumed transparent to thermal radiation. This first part of the paper presents and discusses the basic structure of the former mathematical model and of the new one.

Thermal radiation characteristics in dilute phase region of the oxy-fuel combustion pressurized fluidized bed

2020 ◽  
Vol 179 ◽  
pp. 115659
Author(s):  
Xin Zeng ◽  
Cai Liang ◽  
Lunbo Duan ◽  
Xiaoping Chen ◽  
Daoyin Liu ◽  
...  
Keyword(s):  
Thermal Radiation ◽  
Fluidized Bed ◽  
Phase Region ◽  
Fuel Combustion ◽  
Radiation Characteristics

scholarly journals INCORPORATION OF A TWO-FLUX MODEL FOR RADIATIVE HEAT TRANSFER IN A COMPREHENSIVE FLUIDIZED BED SIMULATOR PART I: PRELIMINARY THEORETICAL INVESTIGATIONS

2003 ◽  
Vol 2 (1) ◽  
Author(s):  
J. A. Rabi ◽  
M. L. De Souza Santos
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Thermal Radiation ◽  
Fluidized Bed ◽  
Radiative Heat ◽  
Radiation Heat Transfer ◽  
Basic Structure ◽  
Solid Particles ◽  
Particulate Media ◽  
Bubbling Fluidized Bed

Over the last two decades, a comprehensive mathematical model and its corresponding computational program, aimed to simulate steady-state operations of bubbling fluidized bed equipments, has been continuously improved and tested. Despite its success, the simulator has employed a simple approach for radiative heat transfers. In cases of high temperatures, thermal radiation becomes an important energy transfer mode and the original model could lead to deviations above acceptable levels. The purpose of the present work was to improve the model for thermal radiation heat transfer between all solid particles in the bed section by applying a two-flux method to a non-homogeneous polydispersed particulate media in radiative equilibrium. Gases in the emulsion and in the bubbles were assumed transparent to thermal radiation. This first part of the paper presents and discusses the basic structure of the former mathematical model and of the new one.

scholarly journals Management of Technology Transfer in the Traditional Tempeh and Tofu Industries

2019 ◽  
Vol 20 (2) ◽  
pp. 69-78
Author(s):  
Ign. Suharto ◽  
YIP Arry Miryanti ◽  
Lita Wijaya
Keyword(s):  
Technology Transfer ◽  
Fluidized Bed ◽  
Skill Training ◽  
Fluidized Bed Reactor ◽  
Cotton Cloth ◽  
Small Scale ◽  
Bag Filter ◽  
Three Phase ◽  
Soybean Fermentation ◽  
Rhizopus Sp

The objective is to study the screening of Rhizopus sp inoculum, the utilization of this inoculum for a solid substrate soybean fermentation, to study the trial run of peeling machine and a fluidized bed reactor for the separation of soybean skin and soybean meat, to compare a manual cotton cloth bag filter and a manual rotary filter to separate soybean slurry, to run vertical technology transfer of a manual rotary filter into small scale tofu industry according to hygiene control and education skill training . The benefit of this research is to create a new business and to absorb manpower. The method used is a preparation of Rhizopus sp inoculum for fermentation. Trial run of the peeling machine and three phase fluidized bed reactor for the production of cleaned soybean. Cleaned soybeans are delivered to the production of a cake like fermented soybean , soy milk and tofu. Vertical transfer of technology of a manual rotary filter based on technometric approaches to soy milk and tofu industries. Education skill training was attended by 60 participants. The research results can be shown that the utilization of Rhizopus oligoporus and Rhizopus oryzae inoculum for soybean fermentation into a cake like fermented soybean can be accepted by the 60 panelists and local market. The trial run of peeling machine has a capacity of 30 kg per hour, the trial of three phase fluidized bed reactor can produce cleaned soybean after the total weight of soybean skin of about 35% from the total feed. Technology transfer of a manual rotary filter to the small scale of tofu industries can increase an efficiency of 66.37% for 25 minutes is better than a manual a cotton cloth bag filter with an efficiency of 62.62% for 36 minutes in tofu industry according to the hygiene control. This manual rotary filter can be scale-up into a larger scale. Education skill training was attended by 60 participants of a low income group people in rural areas in order to show how of the know how to do something better according to the hygiene control.

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.

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