Pencairan Batubara Peringkat Rendah Papua Menggunakan Katalis Bijih Besi

Low rank coal utilization often adversely affects the equipment used. Distinct with coal liquefaction technology that prioritizes the use of low rank coal. This condition encourages this research, with the aim of observing the liquid potential of low rank Papuan coal by using iron ore catalysts. Papua low rank coal is liquefied on the autoclave 5 liter with iron ore catalyst and antrasen as solvent. Operating conditions consist of temperature of 400ºC and holding time of 60 minutes. The result of conversion of the three samples without catalyst is only in the range of 65.72-66,45 %, whereas the conversion with iron ore catalysts ranged from 88.63-89.94 % and oil yield between 62.11-63,34%. This result also shows the contribution of iron ore catalyst to increase the conversions that averaged 23.04 %.

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CFD Study on Vermiculite Injection System Optimization in a Cyclone-Fired Boiler

ASME 2008 Power Conference ◽

10.1115/power2008-60055 ◽

2008 ◽

Author(s):

Guanghui Yu ◽

Larry Swanson ◽

Wei Zhou ◽

David Moyeda ◽

Joshua Rossow

Keyword(s):

Softening Temperature ◽

System Optimization ◽

Operating Conditions ◽

Low Rank ◽

Injection System ◽

Combustion Model ◽

Rotational Flow ◽

Low Rank Coal ◽

Boiler Furnace ◽

Areas Of Interest

Boilers firing low-rank coal generally experience high levels of slagging and fouling. To help manage convective pass fouling, various additives or conditioners can be injected into the boiler furnace high temperature region as physical disruptors of slag deposits, exhibiting a varying density or gas evolution, which physically breaks up slag or as chemical modifiers of the ash to increase its softening temperature. Vermiculite is one additive that has been applied with success; however, it is important to ensure that the injected material is placed in the most heavily slagged and fouled areas. The purpose of this study was to evaluate the effectiveness of a vermiculite injection system installed on a large cyclone-fired boiler and to identify improvements in the injection system that would permit more effective treatment of the areas of interest. During the study, a million-cell full boiler combustion model was developed. Typical features of the furnace flow and temperature field were obtained. Considering the particular operating conditions and features of the upper furnace flow field (biased gas velocities and rotational flow), optimized injection schemes were proposed. This study shows the usefulness of applying CFD to solve slagging and fouling issues for coal-fired boilers.

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Experimental Study on Low-Temperature Carbonization of Low Rank Coal

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.805-806.1311 ◽

2013 ◽

Vol 805-806 ◽

pp. 1311-1316

Author(s):

Li Qun Wang ◽

Zhong Xiang Wei ◽

Zhong Bo Yi

Keyword(s):

Experimental Study ◽

Ash Content ◽

Carbonization Temperature ◽

Holding Time ◽

Low Rank ◽

Volatile Content ◽

Low Rank Coal ◽

Fixed Carbon ◽

Dry Distillation ◽

Increasing Trend

In this paper,a research was carried out on the regularities of carbonization temperature,holding time and mass on weightlessness of low rank coal. The experiment showed experiments in a certern range (450°C~700°C,<60min),weightlessness of coal in an increasing trend,the remained volatile content of semi-coke was measured reduce tending to value,ash content increased,fixed carbon gradually increased in the temperature range with the improvement of the carbonization temperature and holding time,also hydrogen and oxygen content of the char decreased,a significant increased in the carbon content,nitrogen and sulfur content was essentially the same. Reactivity of CO2 and semi-coke obtained in different carbonization conditions were better,the response rates are 100% when the temperature exceeded 1000°C. Best condition of dry distillation: carbonization temperature was 500°C~650°C,mass of low rank coal was less than 30g,holding time was between 30 minutes to 40 minutes.

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