The Effects of Heterogeneous Reactions on the Reduction of NO in Petroleum-Coke-Fired Fluidized Beds

2005 ◽  
Author(s):  
Chun-Lin Zhang ◽  
De-Chang Liu ◽  
Han-Ping Chen
Keyword(s):  
Fluidized Bed ◽  
Petroleum Coke ◽  
Fluidized Beds ◽  
Heterogeneous Reactions ◽  
Heating Value ◽  
Reduction Of No ◽  
High Heating Value ◽  
High Sulfur Content ◽  
High Heating

Because of high heating value, low volatile, high nitrogen content and high sulfur content, some kinds of petroleum coke are only suitable for use as fuel, especially combusted in fluidized beds. Based on experiments in a 1t/h fluidized bed, we found that lots of NO and N2O were emitted, and they reached to 780ppm and 150ppm respectively. By analyzing the contributions of char-N and volatile-N to the formation of NO and N2O, we also found it was more important to control the combustion of char to reduce the emission of NO and N2O. This paper tried to find a denitrification agent that could work as desulfuration agent in fluidized beds. We chose Fe as the denitrification agent. The influence of iron on the reduction of NO was studied on. The effects of petroleum-coke char, CO and limestone on the reaction of iron and NO were investigated in a bench scale fluidized bed. Quantitative Fe and petroleum coke char were added into a quartz sand bed respectively, the conversions of NO between these conditions were compared with. The results showed that the ability of Fe to reduce NO was much stronger than the char, and the conversion of NO almost reached to 100%. After minutes that depended on the amount of Fe, Fe was oxidized to oxide of Fe, and the conversion of NO decreased. Petroleum coke char could deoxidize the oxide of Fe. Fe that mixed with petroleum coke char could apparently increase the reaction time of Fe and NO. CO was also a reductive agent of the oxide of Fe, but the effect was not strong as char. Limestone little increased the conversion of NO. From the experiments, we suggested that iron or its oxides would be a possible denitrification agent to reduce NO in fluidized beds in situ.

Fluidized Bed Air Gasification Using Low Heating Value Sand-Bedded Dairy Manure and Sludge Pellets

2015 ◽  
Author(s):  
Hyungseok Nam ◽  
Amado Maglinao ◽  
Sergio Capareda
Keyword(s):  
Power Generation ◽  
Fluidized Bed ◽  
Synthesis Gas ◽  
Operating Temperature ◽  
Dairy Manure ◽  
Ash Content ◽  
Heating Value ◽  
High Heating Value ◽  
High Heating ◽  
Sand Bedding

Solid manure handling is a major environmental issue confronting animal facilities in the United States. One difficulty in using dairy manure as a fuel source is the presence of sand bedding used for lactating dairy cows. More than 30% of dairy farms use sand beds for a dry and clean environment that prevents bacterial growth [1]. In this study, dairy animal manure obtained directly from waste lagoons was used for the air gasification process. The manure was dried to reduce the moisture down to 5% and a sand separating system was designed to remove some sand bedding materials. Preliminary air gasification experiments showed that the direct use of dairy manure containing 75% ash content, that reflect high sand content, reduced the temperature of the reactor. The study is also aimed at handling unprocessed dairy manure and generating electric power for the on-site use. A high heating value manure is needed to run the gasifier and the produced synthesis gas (or syngas) is fed to an engine coupled with a generator. Some dairy manure gasification work were done using fresh dairy manure. The highest heating value from the dairy manure biomass was found to be 4.5MJ/kg in a fixed-bed gasifier [2]. Another gasification study using a fluidized-bed reactor could produce syngas heating value as high as 4.7MJ/m3 from dairy manure [3]. A bench-scale fluidized bed containing a 3-inch diameter reactor tube with a cyclone and a scrubber was used to gasify dairy manure using air at different temperatures. The sand separated dairy manure used in this study contained approximately 45% ash content. The maximum heating value of the synthesis gas was 3.8MJ/m3 at an operating temperature of 750°C. The syngas will need to be upgraded. To upgrade the synthesis gas heating value, sludge pellets of 18.7MJ/kg were mixed with the dairy manure in different ratios of 10% and 30%. The syngas heating values from mixed manure with sludge pellet were increased to 5MJ/m3 with 10% sludge, and 5.7MJ/m3 with 30% sludge. The sludge used has higher heating value resulting in higher gas HV. The cold gasification efficiency was achieved as high as 36±5% with dairy manure mixed with sludge pellet. At a higher operating temperature, higher efficiency was obtained with increased gas composition of hydrogen and carbon monoxide. This syngas may then be used for power generation as well as possible input gas for the Fisher Tropsch process for liquid biofuel production. The result of the experiments will be a cornerstone for the widespread application of low heating value animal waste for producing high heating value syngas that may be used for electric power generation as a result of various upgrading processes.

scholarly journals Assessment of Renewable Alternatives to Coal, Based on Their High Heating Value and Global Warming Potential

2021 ◽  
pp. 19-23
Author(s):  
V. Dhivakhar ◽  
Maju Varghese ◽  
Keerthi M. S. ◽  
S. Kaviya
Keyword(s):  
Global Warming ◽  
Global Warming Potential ◽  
Power Plants ◽  
Thermal Power ◽  
Thermal Power Plants ◽  
Major Contributor ◽  
Heating Value ◽  
High Heating Value ◽  
Green House Gas ◽  
High Heating

About 40% of the Global Electricity produced is fuelled by coal. Although Coal has various advantages like good High Heating Value, easy availability etc., it also has various disadvantages. Green House Gas Released from Coal Thermal Power Plants is the single major contributor to Global warming. Coal is also nonrenewable. Hence it is important to analyze the viability of potential alternatives and reduce the usage of coal. In this assessment, various potential replacements of coal have been analyzed based on their High heating value (HHV) and their Global Warming Potential. The Global warming Potential (GWP) of the assessed fuels have been calculated by the Respiratory Quotient (RQ) Factor method. Hence a direct comparison between Coal and other replacements based on their HHV and GWP has been performed.

scholarly journals Potensi Penerapan Energi Terbarukan Sebagai Upaya Mewujudkan Kemandirian Desa: Studi Kasus Desa Lendang Nangka Lombok Timur

2021 ◽  
Vol 13 (1) ◽  
pp. 1-10
Author(s):  
Shafwan Amrullah
Keyword(s):  
Air Flow ◽  
Heating Value ◽  
High Heating Value ◽  
High Heating

Desa saat ini didorong menjadi desa mandiri, baik dalam bidang energi maupun ekonomi dengan mengimplementasikan energi terbarukan untuk meningkatkan kemandirian energi sebagai salah satu langkah meningkatkan ekonomi masyarakat. Penelitian ini bertujuan untuk menganalisis potensi penggunaan energi terbarukan seperti Pembangkit Listrik Tenaga Bayu (PLTB), Pembangkit Listrik Tenaga Surya (PLTS), Pembangkit Listrik Tenaga Air (PLTA), dan Konversi Energi Gasifikasi di desa Lendang Nangka, Kabupaten Lombok Timur. Penelitian dilakukan dengan pengumpulan data baik dari BMKG dan pengujian secara langsung menggunakan alat Air Flow Anemometer GM8902 untuk mengetahui kecepatan angin dan DIGITAL TECHNOMETER LX-1010B untuk mengetahui intensitas cahaya matahari. Selain itu dilakukan wawancara kepada pengusaha kecil dan menengah untuk mengetahui penggunaan energi dalam menyokong proses produksinya. Hasil dari penelitian menunjukkan bahwa potensi PLTB yang dapat diemplementasikan adalah PLTB sekala kecil dengan daya sekitar 23,4-632,88 kWh/turbin. Untuk potensi PLTS menghasilkan daya sebesar 410-566 kWh per meter persegi panel surya. Untuk potensi PLTA, turbin yang cocok adalah turbin ukuran kecil dengan potensi daya sekitar 0,3024-2,2194 kWh. Sedangkan untuk potensi penggunaan converter energi jenis gasifikasi dapat dilakukan untuk mengurangi penggunaan bahan bakar tidak terbarukan sekaligus menghemat biaya porduksi. Sebab, nilai High Heating Value gas sintetik yang dihasilkan 1,7 kali lebih besar daripada pembakaran langsung dengan kayu.

scholarly journals Energy Recovery from Waste Tires Using Pyrolysis: Palestine as Case of Study

Energies ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1817 ◽  
Author(s):  
Ramez Abdallah ◽  
Adel Juaidi ◽  
Mahmoud Assad ◽  
Tareq Salameh ◽  
Francisco Manzano-Agugliaro
Keyword(s):  
Carbon Black ◽  
West Bank ◽  
The Other ◽  
Liquid Fuels ◽  
Pyrolysis Oil ◽  
Pyrolysis Gas ◽  
Heating Value ◽  
Waste Tires ◽  
High Heating Value ◽  
High Heating

The first industrial-scale pyrolysis plant for solid tire wastes has been installed in Jenin, northern of the West Bank in Palestine, to dispose of the enormous solid tire wastes in the north of West Bank. The disposable process is an environmentally friendly process and it converts tires into useful products, which could reduce the fuel crisis in Palestine. The gravimetric analysis of tire waste pyrolysis products from the pyrolysis plant working at the optimum conditions is: tire pyrolysis oil (TPO): 45%, pyrolysis carbon black (PCB): 35%, pyrolysis gas (Pyro-Gas): 10% and steel wire: 10%. These results are depending on the tire type and size. It has been found that the produced pyrolysis oil has a High Heating Value (HHV), with a range of 42 − 43   ( MJ / kg ) , which could make it useful as a replacement for conventional liquid fuels. The main disadvantage of using the TPO as fuel is its strong acrid smell and its low flash point, as compared with the other conventional liquid fuels. The produced pyrolysis carbon black also has a High Heating Value (HHV) of about 29 (MJ/kg), which could also encourage its usage as a solid fuel. Carbon black could also be used as activated carbon, printers’ ink, etc. The pyrolysis gas (Pyro-Gas) obtained from waste tires mainly consist of light hydrocarbons. The concentration of H2 has a range of 30% to 40% in volume and it has a high calorific value (approximately 31   MJ / m 3 ), which can meet the process requirement of energy. On the other hand, it is necessary to clean gas before the burning process to remove H2S from Pyro-Gas, and hence, reduce the acid rain problem. However, for the current plant, some recommendations should be followed for more comfortable operation and safer environment work conditions.

A Novel Technique for “In-Situ” Characterization of Devolatilization Rate of Solid Fuels in Fluidized Beds

2005 ◽  
Author(s):  
R. Solimene ◽  
R. Chirone ◽  
A. Marzocchella ◽  
P. Salatino
Keyword(s):  
Fluidized Bed ◽  
Fluidized Beds ◽  
Volatile Matter ◽  
Solid Fuels ◽  
In Situ Characterization ◽  
Flow Restriction ◽  
History Of ◽  
Fuel Particles

The characterization of volatile matter (VM) emission from solid fuel particles during fluidized bed combustion/gasification is relevant to reactor performance influencing the fate of VM as it results from competing phenomena of release, mixing/segregation and burn-out. The rate and the time-history of volatile matter release strongly affect axial segregation of fuel particles in the bed, favoring the establishment of the stratified combustion regime. On the other hand, the comparison between the devolatilization and radial solids mixing time scales affects the radial distribution of volatile matter across the reactor. Short devolatilization times determine VM release localized near feeding point. The knowledge of devolatilization kinetics, as determined by thermogravimetric analysis, does not take into account key process phenomena such as the effective time-temperature history of the devolatilizing particle. A novel and easy-to-use diagnostic technique for “in-situ” characterization of the devolatilization rate of fuel particles in gas fluidized beds is proposed in the present paper. It is based on the time-resolved measurement of pressure in a bench scale fluidized bed reactor equipped with a calibrated flow restriction at the exhaust. The procedure consists of the injection of a single fuel particle (or small batches of multiple particles) and continuous monitoring of the pressure in the reactor. The bed was kept at a constant temperature by external heating and fluidized with nitrogen. Gas pressure inside the reactor increases during devolatilization as a consequence of the increased flow rate, due to the emission of volatile matter, across the calibrated flow restriction at the exhaust. Experimental data are analyzed in the light of a model of the experiment based on the transient mass balance on the reactor volume referred to the fluidizing gas and to the volatile matter. The comparison between experimental pressure time series and model computations enables the characterization of the kinetic parameters of devolatilization rate for samples of different coals as well as of non-fossil solid fuels.

Producing a high heating value and weather resistant solid fuel via briquetting of blended wood residues and thermoplastics

Fuel ◽  
2021 ◽  
Vol 283 ◽  
pp. 119263
Author(s):  
Bing Song ◽  
Martin Cooke-Willis ◽  
Beatrix Theobald ◽  
Peter Hall
Keyword(s):  
Solid Fuel ◽  
Heating Value ◽  
High Heating Value ◽  
Wood Residues ◽  
High Heating

scholarly journals Fast analysis of high heating value and elemental compositions of sorghum biomass using near-infrared spectroscopy

Energy ◽  
2017 ◽  
Vol 118 ◽  
pp. 1353-1360 ◽  
Author(s):  
Ke Zhang ◽  
Ling Zhou ◽  
Michael Brady ◽  
Feng Xu ◽  
Jianming Yu ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Fast Analysis ◽  
Heating Value ◽  
Elemental Compositions ◽  
High Heating Value ◽  
High Heating

scholarly journals CARACTERIZAÇÃO DE BIOMASSAS PARA A BRIQUETAGEM

FLORESTA ◽  
2015 ◽  
Vol 45 (4) ◽  
pp. 713 ◽  
Author(s):  
Diego Aleixo Silva ◽  
Gabriela Tami Nakashima ◽  
João Lúcio Barros ◽  
Alessandra Luzia Da Roz ◽  
Fabio Minoru Yamaji
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Sugarcane Bagasse ◽  
Saccharum Officinarum ◽  
Ash Content ◽  
Heating Value ◽  
Pine Sawdust ◽  
High Heating Value ◽  
Sugarcane Straw ◽  
High Heating

O objetivo deste trabalho foi caracterizar a produção de briquetes feita a partir de quatro diferentes biomassas residuais. Foram utilizados os resíduos de serragem de Eucalyptus sp, serragem de Pinus sp, bagaço de cana-de-açúcar (Saccharum officinarum L.) e palha de cana-de-açúcar. Os resíduos foram tratados para que obtivessem 12% de umidade e uma granulometria inferior a 1,70 mm. Foram produzidos 15 briquetes para cada um dos quatro tratamentos. A pressão utilizada foi de 1250 kgf.cm-2 durante 30 segundos. Os briquetes obtiveram densidades que oscilaram 0,88 a 1,11 g.cm-3. Isto representou uma faixa de 5 a 14 vezes a menos de ocupação de volume para uma mesma quantidade de massa. O poder calorifico foi de 19.180 J.kg-1 e 20.315 J.kg-1 para as serragens de eucalipto e pinus respectivamente. Para o bagaço e palha de cana os valores foram de 18.541 J.kg-1 e 15.628 J.kg-1. A palha da cana-de-açúcar apresentou um teor de cinzas de 12%. As expansões dos tratamentos oscilaram 4 a 9% e as resistências mecânicas variaram de 1,215 MPa à 0,270 MPa. Todos os briquetes se mostraram resistentes para um empilhamento superior a 10 m de altura. O procedimento adotado pode ajudar a diminuir o espaço de estocagem e de transporte. AbstractThis research aims to characterize the production of briquettes from four different biomasses. We used residues such as Eucalyptus sp sawdust, Pinus sp sawdust , sugarcane bagasse (Saccharum officinarum L.) and sugarcane straw. The residues were treated to obtain 12% moisture content and particle size less than 1.70 mm. We produced 15 briquettes for each treatment. The pressure used was 1250 kgf.cm-2 for 30 seconds. The briquettes obtained densities ranged from 0.88 to 1.11 g.cm-3. This represented a range of 5 to 14 times less volume occupancy for the same amount of mass. The high heating value (HHV) was 19,180 J.kg-1 and 20,315 J.kg-1 for eucalyptus and pine sawdust respectively. The HHV for the bagasse was 18,541 J.kg-1 and for straw was 15,628 J.kg-1. The straw presented an ash content of 12%. The expansions of the treatments ranged 4 to 9% and mechanical resistances ranging from 1,215 MPa to 0,270 MPa. All briquettes were resistant to a higher stacking to 10 m high. The methods can help to decrease the space of storage and transport.Keywords: Waste; biofuel; energy; compression; stacking.

scholarly journals USE OF CASTOR OIL PLANT PIE FOR SOLID BIOFUEL PRODUCTION

2019 ◽  
Vol 8 (3) ◽  
Author(s):  
Paula Martucheli Amaral ◽  
Luciano Donizeti Varanda ◽  
Gabriela Tami Nakashima ◽  
Pâmela Beatriz Moreira De Oliveira ◽  
Luis Ricardo Oliveira Santos ◽  
...  
Keyword(s):  
Castor Oil ◽  
Mechanical Test ◽  
Calorific Value ◽  
Biofuel Production ◽  
Residual Oil ◽  
Heating Value ◽  
High Heating Value ◽  
Solid Biofuel ◽  
High Heating ◽  
Oil Plant

The objective of this study was the characterization, analysis and compaction of residues from castor oil plant pie extraction to verify its potential as solid biofuel. The chemical analysis, the mechanical test and the gross calorific value had satisfactory results. With the extraction of residual oil of the material there was a decrease on the high heating value. The produced briquettes presented good longitudinal expansion as well as mechanical strenght, however the presence of residual oil had influence on their strenght. In conclusion, the castor oil plant pie possesses  energetic characteristics suitable for solid biofuel production, in addition it contributes with the reduction of industrial waste amount.

scholarly journals Conversion of organic fraction of municipal solid waste into solid fuel via hydrothermal carbonization

2019 ◽  
Author(s):  
Herlian Eriska ◽  
Kania Dewi ◽  
Enri Damanhuri ◽  
Ari Darmawan Pasek
Keyword(s):  
Municipal Solid Waste ◽  
Process Condition ◽  
Hydrothermal Carbonization ◽  
Mixture Component ◽  
Process Conditions ◽  
Organic Fraction ◽  
Heating Value ◽  
High Heating Value ◽  
High Heating ◽  
Solid Load

Hydrothermal carbonization (HTC) is thermochemical process that can convert wet biomass into coal-like material. In this study, a series of HTC experiments was done. In the first stage targeted to obtain the process condition for mixture component. The process conditions comprised temperature, solid load, and holding time. Five typical components were used as representative pseudo-components of organic fraction of municipal solid waste. Each of substrates was carried out on the prototype HTC reactor. Process condition took place tempera- ture at 190, 210 and 230 oC, with a holding time (30 and 60 minutes) and feed to water ratio (0.1, 0,2, 0.3). The result from first stage showed that the optimum process condition for mixture component were temperature 215 oC, 55 minutes, and solid load 0.16. The process conditions were applied for next stage. In the second stage, mixture component comprised 15% fruit peel, 10% food waste, 10% of office paper, 30% leaves, and 35% sawdust were used as feedstock. Model to determine process condition for mixture component and also to predict high heating value have been developed. The fuel characteristics and combustion behavior of HTC-derived hydrochars were eval- uated. Hydro-thermal carbonization of waste gave high heating value (HHV) with value of 20.24 MJ/kg higher than its raw 16.42 MJ/kg.

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