scholarly journals COMPARISON OF POTENTIAL MATERIALS FOR PRODUCER GAS WET SCRUBBING IN PILOT-SCALE GASIFICATION UNIT

2019 ◽  
Author(s):  
JAKUB ČESPIVA ◽  
JAN SKŘÍNSKÝ ◽  
JÁN VEREŠ
Keyword(s):  
Pilot Scale ◽  
Producer Gas ◽  
Wet Scrubbing

scholarly journals Pilot-scale studies on NOx removal from flue gas via NO ozonation and absorption into NaOH solution

2012 ◽  
Vol 33 (3) ◽  
pp. 345-358 ◽  
Author(s):  
Maciej P. Jakubiak ◽  
Keyword(s):  
Flue Gas ◽  
Experimental Studies ◽  
Pilot Scale ◽  
No Oxidation ◽  
Molar Ratio ◽  
Nox Removal ◽  
Gas Channel ◽  
Wet Scrubbing ◽  
Naoh Solution ◽  
Gas Ratio

Abstract The paper presents results of experimental studies on removal of NOx from flue gas via NO ozonation and wet scrubbing of products of NO oxidation in NaOH solutions. The experiment was conducted in a pilot plant installation supplied with flue gas from a coal-fired boiler at the flow rate 200 m3/h. The initial mole fraction of NOx,ref in flue gas was approx. 220 ppm, the molar ratio X = O3/NOref varied between 0 and 2.5. Ozone (O3 content 1÷5% in oxygen) was injected into the flue gas channel before the wet scrubber. The effect of the mole ratio X, the NaOH concentration in the absorbent, the liquid-to-gas ratio (L/G) and the initial NOx concentration on the efficiency of NOx removal was examined. Two domains of the molar ratio X were distinguished in which denitrification was governed by different mechanisms: for X ≤ 1.0 oxidation of NO to NO2 predominates with slow absorption of NO2, for X >> 1.0 NO2 undergoes further oxidation to higher oxides being efficiently absorbed in the scrubber. At the stoichiometric conditions (X = 1) the effectiveness of NO oxidation was better than 90%. However, the effectiveness of NOx removal reached only 25%. When ozonation was intensified (X ≥ 2.25) about 95% of NOx was removed from flue gas. The concentration of sodium hydroxide in the aqueous solution and the liquid-to-gas ratio in the absorber had little effect on the effectiveness of NOx removal for X > 2.

Simulation of High Temperature Air – Steam Biomass Gasification in a Downdraft Gasifier Using ASPEN PLUS

2012 ◽  
Vol 267 ◽  
pp. 57-63
Author(s):  
Worapot Ngamchompoo ◽  
Kittichai Triratanasirichai
Keyword(s):  
High Temperature ◽  
Process Model ◽  
Waste Heat ◽  
Aspen Plus ◽  
Biomass Gasification ◽  
Pilot Scale ◽  
Producer Gas ◽  
Downdraft Gasifier ◽  
High Heating Value ◽  
Cold Gas Efficiency

A comprehensive process model is developed for high temperature air – steam biomass gasification in a downdraft gasifier using the ASPEN PLUS simulator. The simulation results are compared with the experimental data obtained through pilot scale downdraft gasifier. In this study, the model is used to investigate the effects of gasifying agent preheating, equivalence ratio (ER), and steam/biomass (S/B) on producer gas composition, high heating value (HHV), and cold gas efficiency (CGE). Results indicate that H2 and CO contents have increased when gasifying agent preheating is used, while gasifying agent preheating has no effect with H2 and CO at high ER. At high level of S/B, the concentrations of H2 and CO are related with water-gas shift reaction in significant. HHV and CGE depend on the concentrations of H2 and CO in producer gas, which can increase by preheated gasifying agent. However, gasifying agent preheating should apply with waste heat from the process because there is no additional cost of energy price.

The Potential Application of Soil Washing to the Treatment of Radioactively Contaminated Soils, Rubble and Rocks From UKAEA’s Sites

2001 ◽  
Author(s):  
Mike Pearl
Keyword(s):  
Contaminated Soil ◽  
Contaminated Soils ◽  
Potential Application ◽  
Soil Washing ◽  
Pilot Scale ◽  
Surface Contamination ◽  
Radioactive Material ◽  
Wet Scrubbing ◽  
Tumbling Mill

Abstract Laboratory and pilot scale tests have been carried out to assess the potential application of soil washing to the treatment of radioactively contaminated soil, rubble and rocks from its sites. With radioactively contaminated soils it was difficult to clean to a free release level (<0.4 Bq/g), although it was possible to clean to a risk based target, or to a waste categorised as Very Low Radioactive Material. With radioactively contaminated rubble and rocks, wet scrubbing in a tumbling mill was very effective at removing surface contamination so that the products could be disposed as free release material or Very Low Radioactive Material.

Lab-scale and pilot-scale two-stage gasification of biomass using active carbon for production of hydrogen-rich and low-tar producer gas

2020 ◽  
Vol 198 ◽  
pp. 106240 ◽  
Author(s):  
Yong-Seong Jeong ◽  
Young-Kon Choi ◽  
Bo-Sung Kang ◽  
Jae-Hong Ryu ◽  
Hyo-Sik Kim ◽  
...  
Keyword(s):  
Active Carbon ◽  
Pilot Scale ◽  
Producer Gas ◽  
Two Stage ◽  
Production Of Hydrogen

Superheated steam injection as primary measure to improve producer gas quality from biomass air gasification in an autothermal pilot-scale gasifier

2022 ◽  
Vol 181 ◽  
pp. 1223-1236
Author(s):  
D.T. Pio ◽  
H.G.M.F. Gomes ◽  
L.A.C. Tarelho ◽  
A.C.M. Vilas-Boas ◽  
M.A.A. Matos ◽  
...  
Keyword(s):  
Superheated Steam ◽  
Steam Injection ◽  
Pilot Scale ◽  
Producer Gas ◽  
Primary Measure

scholarly journals Ilmenite as low-cost catalyst for producer gas quality improvement from a biomass pilot-scale gasifier

2020 ◽  
Vol 6 ◽  
pp. 325-330
Author(s):  
D.T. Pio ◽  
H.G.M.F. Gomes ◽  
L.A.C. Tarelho ◽  
L.C.M. Ruivo ◽  
M.A.A. Matos ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Low Cost ◽  
Pilot Scale ◽  
Producer Gas

Biomass Gasification in a Pilot-Scale Gasifier

2014 ◽  
Author(s):  
Yunye Shi ◽  
Tejasvi Sharma ◽  
Guiyan Zang ◽  
Albert Ratner
Keyword(s):  
Gas Chromatography ◽  
Mass Balance ◽  
Biomass Gasification ◽  
Pilot Scale ◽  
Producer Gas ◽  
Gas Composition ◽  
Operational Parameters ◽  
Gas Generation ◽  
Gas Concentration ◽  
Corn Kernels

A study of the gasification of corn kernels has been performed on an experimental, pilot-scale (50–100 lbs/hour) gasification unit. Analysis was made on the performance of the gasifier in terms of producer gas generation and composition, char production and process mass balance. In these experiments corn kernels was used so that the shapes and sized of the materials did not influence the results. Experiments were conducted with varying temperature of fuel bed. For each experimental condition, the permanent gas composition was measured continuously by gas chromatography (GC). Tar was collected according to CEN Standard. Bio-char were weighted for mass balance. The results from the study indicate that there were differences between various operational parameters in terms of producer gas concentration and char percentage.

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