GAS-CLEANING TECHNOLOGY

Gas from the gasification of pellets made from renewable sources of energy or from lower-quality fuels often contains a number of pollutants. This may cause technical difficulties during the gas use in internal combustion gas engines used for energy and heat cogeneration. Therefore, an adequate system of gas cleaning must be selected. In line with such requirements, this paper focuses on the characterization and comparison of gases produced from different types of biomass during gasification. The biomass tested was wood, straw, and hay pellets. The paper gives a detailed description and evaluation of the measurements from a fix-bed gasifier for the properties of the produced gases, raw fuels, tar composition, and its particle content before and after the cleaning process. The results of elemental composition, net calorific value, moisture, and ash content show that the cleaned gases are suitable for internal combustion engine-based cogeneration systems, but unsuitable for gas turbines, where a different cleaning technology would be needed.

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New Energy Development and Energy Chemical Engineering (Topic Field) Released of Alkali Species under High Pressure Gasification of Pakistani Coal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1094.141 ◽

2015 ◽

Vol 1094 ◽

pp. 141-145

Author(s):

Gul E Rana Jaffri ◽

Syed Ali Rehan Shah Jaffri

Keyword(s):

High Pressure ◽

Power Plants ◽

Chemical Engineering ◽

Elevated Pressure ◽

Severe Problem ◽

Gas Cleaning ◽

Gasification Process ◽

Inorganic Species ◽

Cleaning Technology ◽

Hot Gas Cleaning

Inorganic species are released during pressurized gasification, can cause severe problem of hot corrosion. The direct utilization of coal is harmful for power plants. The aim of work to obtained comprehensive knowledge of release alkali species Na-,K-,Cl and S-species prior to carry out experiment. Therefore thermodynamic equilibrium calculations were performed by Fact Sage 5.2 and simulated the gasification environment at elevated pressure.Three soft Pakistani coal such as Lakhra (Vad < 41.44%), Thar (Vad < 42.02%) and Sor-range ((Vad < 21.11%) belong to Lignite and sub-bituminous coal were selected and releasing order was calculated by plotting mole fraction of each species Vs pressure (5 to 15bar ) at 1000°C.On the basis of predicted releasing order the H2S can be predicted most stable species under gasification at elevated pressure. The high released amount of SO2, H2S, NaCl, KCl and HCl was predicted for LKH and SRC at 5 and 15 bar pressure and 1000°C temperature. Comparing with high pressure the predicted released of H2S was found higher than SO2, NaCl, KCl and HCl at 15 bar pressure while the released of SO2was observed lower than H2S, NaCl, KCl and HCl at 5 bar pressure during gasification process. The above available predicted information is valuable for hot gas cleaning technology.

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Chemical Equilibrium Prediction on Release of Na,K,Cl and S-Species during Gasification of Biomass, Soft and Hard Chinese Coal at Elevated Temperature and Pressure by Fact Sage

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.634-638.723 ◽

2013 ◽

Vol 634-638 ◽

pp. 723-730 ◽

Cited By ~ 1

Author(s):

Gul E Rana Jaffri ◽

Ke Fa Cen ◽

Zhi Hua Wang

Keyword(s):

Elevated Temperature ◽

Power Plants ◽

Combustion Process ◽

Severe Problem ◽

Gas Cleaning ◽

Saw Dust ◽

Temperature And Pressure ◽

Chinese Coal ◽

Cleaning Technology ◽

Hot Gas Cleaning

The release of alkali species can cause of severe problem of hot corrosion during gasification especially at high temperature and pressure. The direct use of coal may harmful for power plants. The aim of work to obtained comprehensive knowledge prior utilization of coal. Therefore, thermodynamic equilibrium calculations were performed by Fact Sage 5.2 and simulated the gasification environment at elevated temperature and pressure. Four hard and soft Chinese coal such as Yungui (Vad<6.6%), Xiao Tun(Vad<11.1), Datong (Vad <23.18), Ping Zhuan (Vad<31.84) ,and Saw dust (Vad<68.80) and Saw dust char (Vad<3.39) belongs to anthracite, Sub-bituminous, lignite, biomass and biomass char were selected and releasing order was calculated by plotting mole fraction of each species Vs temperature (1000 to 1400°C) at 1 bar and VS pressure (5 to 15bar ) at 1000°C. On the basis of predicted releasing order the H2S species can be predicted most stable species for gasification at elevated temperature and pressure. The high released amount of SO2, H2S, NaCl, KCl and HCl was obtained for YUN, DAT,SAD and SADChar at (1400°C-1000°C) temperature and (15-5bar) pressure. Comparing with high pressure the predicted release of KCl and HCl was observed higher but SO2, H2S, and NaCl release was found lower than elevated temperature during combustion process. The above available predicted information is valuable for development of hot gas cleaning technology.

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Flue gas cleaning technology

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(02)80416-7 ◽

2002 ◽

Vol 43 (1) ◽

pp. 41

Keyword(s):

Flue Gas ◽

Gas Cleaning ◽

Cleaning Technology

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THE EFA PROCESS – STATE-OF-THE-ART SINTERPLANT OFF-GAS CLEANING TECHNOLOGY

10.5151/2594-357x-25313 ◽

2014 ◽

Author(s):

Franz Reufer ◽

Andreas Tibus ◽

Thilo Weissert

Keyword(s):

State Of The Art ◽

Gas Cleaning ◽

Cleaning Technology

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Exhaust gas cleaning technology installed at chemical plant

Filtration + Separation ◽

10.1016/s0015-1882(04)00195-8 ◽

2004 ◽

Vol 41 (4) ◽

pp. 32

Keyword(s):

Chemical Plant ◽

Exhaust Gas ◽

Gas Cleaning ◽

Exhaust Gas Cleaning ◽

Cleaning Technology

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Energy Chemical Engineering (Topic Field) Simulation for Influence of High Pressure on Release of Inorganic Species during Combustion of Pakistani Coal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1008-1009.328 ◽

2014 ◽

Vol 1008-1009 ◽

pp. 328-331 ◽

Cited By ~ 1

Author(s):

Gul E Rana Jaffri

Keyword(s):

High Pressure ◽

Chemical Engineering ◽

Combustion Process ◽

Elevated Pressure ◽

Thermal Conversion ◽

Gas Cleaning ◽

Stable Species ◽

Inorganic Species ◽

Cleaning Technology ◽

Hot Gas Cleaning

The inorganic species are highly volatile, released during thermal conversion process and especially at high pressure combustion leads to several problems of fouling, slagging and corrosion when they reach the colder part of plant. The comprehensive knowledge of release alkali species Na-,K-,Cl and S-species is required prior to carry out experiment. Therefore thermodynamic equilibrium calculations were performed by Fact Sage 5.2 and simulated the combustion environment at elevated pressure. Three soft Pakistani coal such as Lakhra (Vad < 41.44%), Thar (Vad < 42.02%) and Sor-range ((Vad < 21.11%) belong to Lignite and sub-bituminous coal were selected and releasing order was calculated by plotting mole fraction of each species VS pressure (5 to 15bar ) at 1000°C. On the basis of predicted releasing order the SO2 can be predicted most stable species under combustion at elevated pressure. The high released amount of SO2, H2S, NaCl, KCl and HCl was predicted for LKH, THC and SRC at 5 and 15 bar pressure and 1000°C temperature.Comparing with high pressure the predicted released of SO2 was found higher than H2S, NaCl, KCl and HCl at 5 bar pressure while the released of H2S was observed lower than SO2, NaCl, KCl and HCl at 15 bar pressure during combustion process. The above available predicted information is valuable for hot gas cleaning technology.

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