An Experimental Study of the Gaseous Pollution Emissions in Petroleum-Coke-Fired Fluidized Beds

2003 ◽  
Author(s):  
Chun-Lin Zhang ◽  
Gui-Cheng Yuan ◽  
De-Chang Liu ◽  
Han-Ping Chen ◽  
Ding-Yu Liu ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Petroleum Coke ◽  
Calorific Value ◽  
Excess Oxygen ◽  
N2o Emissions ◽  
Bed Temperature ◽  
High Sulfur Content ◽  
Bubbling Fluidized Bed ◽  
Pollution Emissions ◽  
Gaseous Pollution

Petroleum cokes have high calorific value (about 37 MJkg−1), high sulfur content (2–7% wt.), and high nitrogen content (1∼3% wt.), introducing serious environmental problems when using as fuel. In this paper the effects of operating parameters (bed temperature, Ca/S mole ratio, and excess oxygen) on gaseous pollutant (SO2, NO, and N2O) emissions in a well-controlled bench scale fluidized bed reactor and an 1t/h bubbling fluidized bed for different type of petroleum cokes. Finally, the pollution emission differences between petroleum coke and coal were compared and the reasons were analyzed.

Co-Firing of Steam Coal With High Sulfur Content Lignite in a Bubbling Fluidized Bed Combustor

2005 ◽  
Author(s):  
Nevin Selc¸uk ◽  
Yusuf Gogebakan ◽  
Hakan Altindag
Keyword(s):  
Fluidized Bed ◽  
Molar Ratio ◽  
So2 Emissions ◽  
Molar Ratios ◽  
High Sulfur Content ◽  
Bubbling Fluidized Bed ◽  
On Line ◽  
Emission Behavior ◽  
Nitrogen Contents ◽  
Fluidized Bed Combustor

Combustion and emission behavior of 100 % steam coal (SET 1) and a mixture of 80 % by weight steam coal and 20 % by weight local lignite, characterized by high sulfur and ash contents, (SET 2) were investigated in the 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) Test Rig. Experiments were performed with limestone addition at various Ca/S molar ratios with fines recycle. In both sets of experiments, parameters other than Ca/S molar ratio were held as nearly constant as possible. On-line measurements of O2, CO2, CO, SO2, NOx emissions were carried out. Comparisons between the emissions show that lower NOx and SO2 emissions are obtained from combustion of steam coal/lignite mixture compared to those from steam coal only despite higher sulfur and almost equal nitrogen contents of the mixture. Calculated combustion efficiencies were found to be around 98 and 96 % for SET 1 and SET 2, respectively. As for the sulfur retention efficiencies, up to three times higher efficiencies were achieved when steam coal is co-fired with high sulfur lignite.

scholarly journals NOx EMISSIONS FROM BUBBLING FLUIDIZED BED COMBUSTION OF LIGNITE COAL

2015 ◽  
Vol 55 (4) ◽  
pp. 275 ◽  
Author(s):  
Pavel Skopec ◽  
Jan Hrdlička ◽  
Jan Opatřil ◽  
Jiří Štefanica
Keyword(s):  
Nitrogen Content ◽  
Fluidized Bed ◽  
Oxygen Concentration ◽  
Brown Coal ◽  
Conversion Factor ◽  
Nox Emissions ◽  
Fluidization Velocity ◽  
Bed Temperature ◽  
Bubbling Fluidized Bed ◽  
Air Staging

This paper presents experimental results of NO<sub>x</sub> emission measurements for combustion of two kinds of coal in a bubbling fluidized bed combustor. The tested fuels were Czech brown coal (CBC) and German young brown coal (GYC). These fuels have different nitrogen contents. The experiments were performed in the pilot scale BFB experimental unit with power output of 500 kW. The influence of several parameters on NO<sub>x</sub> formation are investigated in this paper. The parameters studied here include the effect of the nitrogen content in the fuel, the effect of the oxygen concentration in the bed, the effect of bed temperature, the effect of air staging, and the effect of fluidization velocity. Significantly different behaviour of the fuels was found. Although GYC has a lower nitrogen content than CBC, it is more reactive and produces higher NO<sub>x</sub> emissions. The biggest dependence of NO<sub>x</sub> production for CBC was found for the effects of air staging and fluidization velocity. As the fluidization velocity increases and the amount of secondary air decreases, there is an increase in NOx emissions. The oxygen concentration in the bed has the strongest effect on the NO<sub>x</sub> production of GYCs. With increasing oxygen concentration, the production of NO<sub>x</sub> also increases. On the basis of the NO<sub>x</sub> measurements, the N-NO conversion factor was calculated and the effect of the operating parameters on this conversion factor was investigated.

scholarly journals Effect of Ammonia Injection on NOx and N2O Emissions from Bubbling Fluidized Bed Combustion.

1992 ◽  
Vol 71 (1) ◽  
pp. 50-57 ◽  
Author(s):  
Tadaaki SHIMIZU ◽  
Yutaka TACHIYAMA ◽  
Ayumu KURODA ◽  
Makoto INAGA
Keyword(s):  
Fluidized Bed ◽  
N2o Emissions ◽  
Fluidized Bed Combustion ◽  
Bubbling Fluidized Bed ◽  
Ammonia Injection

Simultaneous Reduction of SO2, NOx, and N2O Emissions from a Two-Stage Bubbling Fluidized Bed Combustor

2000 ◽  
Vol 14 (4) ◽  
pp. 862-868 ◽  
Author(s):  
Tadaaki Shimizu ◽  
Masato Satoh ◽  
Tomoyasu Fujikawa ◽  
Masaru Tonsho ◽  
Makoto Inagaki
Keyword(s):  
Fluidized Bed ◽  
N2o Emissions ◽  
Two Stage ◽  
Simultaneous Reduction ◽  
Bubbling Fluidized Bed ◽  
Fluidized Bed Combustor

Effect of SO2 removal by limestone on NOx and N2O emissions from a bubbling fluidized-bed combustor

Fuel ◽  
1992 ◽  
Vol 71 (7) ◽  
pp. 841-844 ◽  
Author(s):  
Tadaaki Shimizu ◽  
Yutaka Tachiyama ◽  
Ayumu Kuroda ◽  
Makoto Inagaki
Keyword(s):  
Fluidized Bed ◽  
N2o Emissions ◽  
So2 Removal ◽  
Bubbling Fluidized Bed ◽  
Fluidized Bed Combustor

Effect of Batch Feeding of Limestone on NOxand SO2Emissions during Petroleum Coke Combustion in a Bubbling Fluidized Bed Combustor

2001 ◽  
Vol 15 (5) ◽  
pp. 1220-1224 ◽  
Author(s):  
Tadaaki Shimizu ◽  
Tomoyasu Fujikawa ◽  
Masaru Tonsho ◽  
Makoto Inagaki
Keyword(s):  
Fluidized Bed ◽  
Petroleum Coke ◽  
Bubbling Fluidized Bed ◽  
Coke Combustion ◽  
Fluidized Bed Combustor

scholarly journals On line diagnostics and self-tuning method for the fluidized bed temperature controller

2016 ◽  
Vol 37 (1) ◽  
pp. 31-46
Author(s):  
Jan Porzuczek
Keyword(s):  
Fluidized Bed ◽  
Experimental Verification ◽  
Experimental Studies ◽  
Statistical Process ◽  
Temperature Controller ◽  
Tuning Method ◽  
Bed Temperature ◽  
Bubbling Fluidized Bed ◽  
Self Tuning ◽  
On Line

Abstract The paper presents the method of on-line diagnostics of the bed temperature controller for the fluidized bed boiler. Proposed solution is based on the methods of statistical process control. Detected decrease of the bed temperature control quality is used to activate the controller self-tuning procedure. The algorithm that provides optimal tuning of the bed temperature controller is also proposed. The results of experimental verification of the presented method is attached. Experimental studies were carried out using the 2 MW bubbling fluidized bed boiler.

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