scholarly journals Pemanfaatan gasifikasi batubara untuk unit pengeringan teh

2018 ◽  
Vol 5 (2) ◽  
pp. 443
Author(s):  
Ari Susandy Sanjaya ◽  
S Suhartono ◽  
Herri Susanto
Keyword(s):  
Coal Gasification ◽  
Fixed Bed ◽  
Calorific Value ◽  
Diesel Oil ◽  
Fuel Oil ◽  
Dual Fuel ◽  
Processing Unit ◽  
Producer Gas ◽  
Downdraft Gasifier ◽  
Gasification Process

Coal gasification utilization for tea drying unit. Anticipating the rise of fuel oil, the management of a tea plantation and drying plant has considered to substitute its oil consumption with producer gas (gaseous fuel obtained from gasification process). A tea drying unit normally consumes 70 L/h of industrial diesel oil and is operated 10 hours per day. The gasification unit consisted of a down draft fixed bed gasifier (designed capacity of about 100 kg/h), gas cooling and cleaning systems. The gas producer was delivered to the tea processing unit and burned to heat the drying oil: Low calorific value coal (4500 kcal/kg) and wood waste (4000 kcal/kg) have been used as fuel. The gasification unit could be operated as long as 8 hours without refueled since the coal hopper on the toppart of gasifier has a capacity of 1000 kg. Sometimes, the gasification process must be stopped before coal completely consumed due to ash melting inside the gasifier. Combustion of producer gas produced a pale-blue flame, probably due to a lower calorific value of the producer gas or too much excess air. Temperature of heating-air heated by combustion of this producer gas was only up to 96 oC. To achieve the target temperature of 102 oC, a small oil burner must he operated at a rate ofabout 15 L/h. Thus the oil replacement was about 78%.Keywords:  Fuel oil, Producer gas, Downdraft gasifier, Dual fuel, Calorific value, Burner. AbstrakKenaikan harga bahan bakar minyak untuk industri pada awal 2006 telah mendorong berbagai pemikiran dan upaya pemanfaatan bahan bakar alternatif. Sebuah unit gasifikasi telah dipasang di pabrik teh sebagai penyedia bahan bakar alternatif. Unit gasifikasi tersebut terdiri dari gasifier, pendingin, pembersih gas, dan blower. Unit gasifikasi ini ditargetkan untuk dapat menggantikan konsumsi minyak bakar 70 L/jam. Gasifier dirancang untuk kapasitas 120 kg/jam batubara, dan memiliki spesifikasi sebagai berikut: downdraft gasifier; diameter tenggorokan 40 cm, diameter zona reduksi 80 cm. Bunker di bagian atas gasifier memiliki kapasitas sekitar 1000 kg batubara agar gasifier dapat dioperasikan selama 8 jam tanpa pengisian-ulang. Bahan baku gasifikasi yang telah diuji-coba adalah batuhara kalori rendah (4500 kcal/kg) dan limbah kayu (4000 kcal/kg). Gas produser (hasil gasifikasi) dibakar pada burner untuk memanaskan udara pengering teh sampai temperatur target 102 oC. Pembakaran gas produser ternyata menghasilkan api biru pucat yang mungkin disebabkan oleh rendahnya kalor bakar gas dan tingginya udara-lebih. Temperatur udara pengering hasil pemanasan dengan api gas produser hanya mencapai 96 oC. Dan untuk mencapai temperatur udara pengering 102 oC, burner gas prod user harus dibantu dengan burner minyak 15 L/jam. Jadi operasi dual fued ini dapat memberi penghematan minyak bakar 78%.Kata kunci: Minyak bakar, Gas produser, Downdraft gasifier, Dual fuel, Kalor bakar, Burner. 

scholarly journals Application of Recycle System on a Cocoa Pod Husks Gasification in a Fixed-Bed Downdraft Gasifier to Produce Low Tar Fuel Gas

2019 ◽  
Vol 14 (2) ◽  
pp. 120-129
Author(s):  
Sunu Herwi Pranolo ◽  
Joko Waluyo ◽  
Jenni Prasetiyo ◽  
Muhammad Ibrahim Hanif
Keyword(s):  
Combustion Engine ◽  
Fixed Bed ◽  
Gravimetric Method ◽  
Producer Gas ◽  
Fuel Gas ◽  
Downdraft Gasifier ◽  
Gasification Process ◽  
Cold Gas Efficiency ◽  
Volumetric Rate ◽  
Cocoa Pod Husks

Biomass gasification is potentially generating not only producer gas but also tarry components. Practically, the gas may substitute traditional fuel in an internal combustion engine after reducing the tar. This research examined a producer gas recycle system to reduce tar component of producer gas generated with cocoa pod husks gasification using air as gasifying agent in a fixed-bed downdraft gasifier. Cocoa pod husks feed sizes were +1” sieve, -1”+ 0.5” sieve, and -0.5” sieve. The gasification process was operated at the temperature range of 491 – 940oC and at various gasifying agent volumetric rates of 62.84; 125,68; and 188.53 NL/min or at equivalent ratio range of 0.014 – 0.042. A recycle system of outlet producer gas to gasifier was set at volumetric rates of 0.139; 0.196; and 0.240 L/min. The performance of the system was evaluated with analyzing the tar component using gravimetric method of ASTM D5068-13, and the gas component of CO, H2, CO2 and CH4 compositions in producer gas were analyzed using Gas Chromatography GC-2014 Shimadzu sensor TCD-14. This recycle system succeeded in reducing tar content as much as 97.19% at 0.139 L/min of recycle volumetric rate and at biomass feed size of -1”+0.5” sieve. The producer gas contained CO, H2, CO2 and CH4 of 23.29%, 2.66%, 13.30%, and 14.18% respectively. The recycle system cold gas efficiency was observed 65.24% at gasifying agent volumetric rate of 188.53 L/min and at biomass feed size of +1” sieve.

scholarly journals Performance Small Spark Ignition Engine Using Producer Gas From Coal Gasification: Dual Fuel Operation

2021 ◽  
Vol 56 (3) ◽  
pp. 241-247
Author(s):  
Fajri Vidian ◽  
Abdul Kholis
Keyword(s):  
Coal Gasification ◽  
Spark Ignition ◽  
Constant Load ◽  
Spark Ignition Engine ◽  
Dual Fuel ◽  
Producer Gas ◽  
Effective Pressure ◽  
Shaft Power ◽  
Power Operation

This study proposed a dual fuel operation of a mix of gasoline and producer gas from coal gasification on the spark ignition engine. The experiment was carried out on a constant load with variations in speed for single fuel operation of gasoline and dual fuel operation of a mix of gasoline and producer gas to see the influence on speed, torque, power, and braking (effective pressure). The power produced was compared to power produced by the single fuel of producer gas that has been reported in the literature. The result shows an increase of speed would increase torque, power, and braking (effective pressure) for single fuel operation of gasoline and dual fuel operation of a mix of gasoline and producer gas. The power operation of dual fuel of a mix of and gasoline and producer gas will decrease by about 10.9% compared to operation of single fuel of gasoline, and the power operation of the single fuel of producer gas will decrease by about 20% compared to the operation of the single fuel of gasoline. The maximum shaft power produced by dual fuel operation is 1.49 kW at a load of 5 kg and a speed of about 3,500 rpm.

Research on Application of Waste Plastic Disposal of Marine Diesel Engines

2008 ◽  
Vol 45 (04) ◽  
pp. 191-193
Author(s):  
Wei Hai-jun ◽  
Wang Guo-you ◽  
Wang Xiao-rui
Keyword(s):  
Diesel Engines ◽  
Calorific Value ◽  
Diesel Oil ◽  
Fuel Oil ◽  
Advanced Technique ◽  
Engine Operation ◽  
Waste Plastic ◽  
Marine Diesel ◽  
Points Of View ◽  
Research On Application

The purpose of this paper is to study the applicability of thermal processed fuel oil (hereafter called waste plastic disposal, or WPD) of diesel engines using low-quality fuel oil. In the experiment, stability of engine operation and components of exhaust gas, such as NOx and COx, were inspected from basic and applicable points of view. This paper illustrates a new test and result of WPD oil applied to marine diesel engines. In recent years, efforts have to be made to develop an advanced technique for recycling waste plastics in order to use scrapped plastics as fuel for diesel engines. It is very important and necessary for us to cope with the increasing calorific value and to satisfy the growing need of environment protection. The experimental fuel oil is obtained by a mixing of diesel oil, WPD, and water.

Operation of a Circulating Fluidised Bed Biomass Gasifier

2004 ◽  
Author(s):  
Guanyi Chen ◽  
Gang Li ◽  
Michel P. Glazer ◽  
Chunlei Zhang ◽  
J. Andries
Keyword(s):  
Large Scale ◽  
Fixed Bed ◽  
Calorific Value ◽  
Producer Gas ◽  
Fluidised Bed ◽  
Fuel Gas ◽  
Promising Alternative ◽  
Tar Cracking ◽  
Shift Reaction ◽  
Circulating Fluidised Bed

Energy generation from the use of biomass is gaining an increasing attention. Gasification of biomass at present, is widely accepted as a popular technical route to produce fuel gas for the application in boilers, engine, gas/micro turbine or fuel cell. Up to now, most of researchers have focused their attentions only on fixed-bed gasification and fluidised bed gasification under air-blown conditions. In that case, the producer gas is contaminated by high tar contents and particles which could lead to the corrosion and wear of blades of turbine. Furthermore, both the technologies, particularly fixed bed gasification, are not flexible for using multiple biomass-fuel types and also not feasible economically and environmentally for large scale application up to 10∼50 MWth. An innovative circulating fluidised bed concept has been considered in our laboratory for biomass gasification thereby overcoming these challenges. The concept combines and integrates partial oxidation, fast pyrolysis (with an instantaneous drying), gasification, and tar cracking, as well as a shift reaction, with the purpose of producing a high quality of gas, in terms of low tar level and particulates carried out in the producer gas, and overall emissions reduction associated with the combustion of producer gas. This paper describes our innovative concept and presents some experimental results. The results indicate that the gas yield can be above 1.80Nm3/kg with the calorific value of 4.5–5.0MJ/Nm3, and the fluctuation of the gas yield during the period of operation is 3.3%–3.5% for the temperature of 750–800 °C. In genera, the results achieved support our concept as a promising alternative for the gasifier coupled with micro/gas turbine to generate electricity.

scholarly journals Assessment of coal gasification in a pressurized fixed bed gasifier using an ASPEN plus and Euler–Euler model

2020 ◽  
Vol 7 (3) ◽  
pp. 516-535
Author(s):  
Tamer M. Ismail ◽  
Mingliang Shi ◽  
Jianliang Xu ◽  
Xueli Chen ◽  
Fuchen Wang ◽  
...  
Keyword(s):  
Coal Gasification ◽  
Fixed Bed ◽  
Size Variation ◽  
Aspen Plus ◽  
Two Dimensional ◽  
Cfd Model ◽  
Gas Generation ◽  
Gasification Process ◽  
Promising Tool ◽  
Euler Model

Abstract With the help of Aspen Plus, a two-dimensional unsteady CFD model is developed to simulate the coal gasification process in a fixed bed gasifier. A developed and validated two dimensional CFD model for coal gasification has been used to predict and assess the viability of the syngas generation from coal gasification employing the updraft fixed bed gasifier. The process rate model and the sub-model of gas generation are determined. The particle size variation and char burning during gasification are also taken into account. In order to verify the model and increase the understanding of gasification characteristics, a set of experiments and numerical comparisons have been carried out. The simulated results in the bed are used to predict the composition of syngas and the conversion of carbon. The model proposed in this paper is a promising tool for simulating the coal gasification process in a fixed bed gasifier.

Performance, Emission Characteristics of Dual Fuel Engine Fuelled with Brown Briquette Biomass and Rice bran Oil Biodiesel

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
K.M. Nataraja ◽  
N.R. Banapurmath ◽  
V.S. Yaliwal ◽  
Nandish Mathad
Keyword(s):  
Rice Bran ◽  
Rice Bran Oil ◽  
Agricultural Waste ◽  
Dual Fuel ◽  
Producer Gas ◽  
Fuel Saving ◽  
Engine Operation ◽  
Downdraft Gasifier ◽  
Pilot Fuel ◽  
Operation Results

In this work agricultural waste-based coconut biomass and compressed agricultural waste derived from brown briquette were used for generation of gas in a downdraft gasifier. Its subsequent combustion takes place in a modified diesel engine using rice bran oil (RiOME) biodiesel injected in bi-fuel mode. For the injected pilot fuel, producer gas operation with coconut biomass derived fuel has improved liquid fuel saving. Downdraft gasifier was integrated with four stroke DI water cooled 5.2 kW CI engine at 1500 rpm speed. Experimentation results showed that for the gasifierengine system coconut biomass derived gas with diesel based dual fuel operation results in 9.05% higher BTE. RiOME producer gas (CNS) operation showed 16.1% decrease in EGT and 12.1% reduction in NOx emission compared to diesel based dual fuel operation. NOx emissions for the RiOME based engine operation were found to be lower than the diesel based operation. However, the smoke, HC and CO emissions were higher. Diesel fuel saving about 56% was achieved by diesel and producer gas (CNS) dual fuel operation and 100% biofuel utilization in RiOME -producer gas bi-fuel mode of operation was achieved. Further, heat release rates and cylinder pressure for RiOME producer gas (CNS) was marginally lesser than diesel operation.

Kinetic analysis of catalytic coal gasification process in fixed bed condition using Aspen Plus

2013 ◽  
Vol 38 (14) ◽  
pp. 6021-6026 ◽  
Author(s):  
Dong-Ha Jang ◽  
Hyung-Taek Kim ◽  
Chan Lee ◽  
Su-Hyun Kim
Keyword(s):  
Kinetic Analysis ◽  
Coal Gasification ◽  
Fixed Bed ◽  
Aspen Plus ◽  
Gasification Process

scholarly journals A Comprehensive Literature Review of Thermochemical Conversion of Biomass for Syngas Production and Associated Challenge

2019 ◽  
Vol 38 (2) ◽  
pp. 495-512
Author(s):  
Ghulamullah Maitlo ◽  
Rasool Bux Mahar ◽  
Zulfiqar Ali Bhatti ◽  
Imran Nazir
Keyword(s):  
Fossil Fuels ◽  
Fixed Bed ◽  
Biomass Gasification ◽  
Gaseous Product ◽  
Gas Production ◽  
Thermochemical Conversion ◽  
Producer Gas ◽  
Syngas Production ◽  
Gasification Process

The interest in the thermochemical conversion of biomass for producer gas production since last decade has increased because of the growing attention to the application of sustainable energy resources. Application of biomass resources is a valid alternative to fossil fuels as it is a renewable energy source. The valuable gaseous product obtained through thermochemical conversion of organic material is syngas, whereas the solid product obtained is char. This review deals with the state of the art of biomass gasification technologies and the quality of syngas gathered through the application of different gasifiers along with the effect of different operating parameters on the quality of producer gas. Main steps in gasification process including drying, oxidation, pyrolysis and reduction effects on syngas production and quality are presented in this review. An overview of various types of gasifiers used in lignocellulosic biomass gasification processes, fixed bed and fluidized bed and entrained flow gasifiers are discussed. The effects of various process parameters such as particle size, steam and biomass ratio, equivalence ratio, effects of temperature, pressure and gasifying agents are discussed. Depending on the priorities of several researchers, the optimum value of different anticipated productivities in the gasification process comprising better quality syngas production improved lower heating value, higher syngas production, improved cold gas efficiency, carbon conversion efficiency, production of char and tar have been reviewed.

scholarly journals Performance Of Four Stroke Compression Ignition Engine Operated On Dual Fuel Mode With Producer Gas And Diesel

2019 ◽  
Vol 8 (11) ◽  
pp. 83-88
Keyword(s):  
Conversion Rate ◽  
Flame Temperature ◽  
Calorific Value ◽  
Prosopis Juliflora ◽  
Heat Energy ◽  
Dual Fuel ◽  
Producer Gas ◽  
Compression Ignition ◽  
Waste Biomass ◽  
Compression Ignition Engine

We intensify our probe on waste biomass found in South India namely Prosopis Juliflora, because of its forceful growth in uncultivated agricultural landfills. To depose the Prosopis Juliflora, biomass gasification is the sufficient thermo-chemical reaction to excerpt useful energy from waste biomass. The fluidized bed gasifier (FBG) was used to gasify the waste biomass Prosopis Juliflora with a feed rate capacity from 5 to 20kg/hr and temperature is in the range of 650 - 950℃ with an equivalence ratio of 0.24 - 0.44 was maintained. When the gasifier is operated alone, the flame temperature is lower so that the conversion rate of heat energy will also be lower. If the gasifier is operated with accessories the flame temperature got increased by 40%, the conversion rate of heat energy will also be high in the compression ignition (CI) engine. The brake thermal efficiency of compression ignition engine for both (diesel) single fuel and (producer gas + diesel) dual fuel modes at four different producer gas mass flow rate has been shown and specific fuel consumption(SFC) has improved slightly due to addition of calorific value in the producer gas to the supply to the engine from the gasifier.

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