Methods of Increasing the Calorific Value of Fine Coal Waste

2016 ◽  
pp. 409-414 ◽  
Author(s):  
Jan J. Hycnar ◽  
Piotr Pasiowiec ◽  
Barbara Tora
Keyword(s):  
Calorific Value ◽  
Coal Waste ◽  
Fine Coal

Production of fuels on the basis of sewage sludge through conditioning using high calorific value fractions

2008 ◽  
Vol 3 (1) ◽  
Author(s):  
Karl-Georg Schmelz ◽  
Anja Reipa ◽  
Hartmut Meyer
Keyword(s):  
Sewage Sludge ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Calorific Value ◽  
Fluidised Bed ◽  
Sludge Treatment ◽  
Heating Value ◽  
Fine Coal ◽  
Used Cars ◽  
Plastic Components

Emschergenossenschaft and Lippeverband operate 59 wastewater treatment plants which produce approx. 100,000 Mg TS of sewage sludge each year. Using sludge pressure pipelines, about 60 % of this sludge are transported to the central sludge treatment plant in Bottrop. The digested sludges are conditioned using fine coal and polymers and are dewatered using membrane filters. By adding coal, the heating value of the sludge is raised which enables autothermal combustion of the dewatered sludges in fluidised bed furnaces at the central sludge treatment plant. In order to replace coal, a fossil fuel, as conditioning agent, experiments were conducted using alternative materials with high heating values. The addition of shredder fluff agglomerates proved to be particularly successful. Shredder fluff agglomerates are a residue from the recycling of used cars and are generated in a multistage process (e.g. Volkswagen-SiCon Process) by separating the light shredder fraction (plastic components etc.) from the total shredder fluff. The fibrous material is outstandingly suitable for improving the dewaterability and for sufficiently raising the heating value of the dewatered sludge in order to enable autothermal combustion. Since first experiments showed very positive results, a full-scale long-term test-run will take place in 2007.

scholarly journals A Feasibility Study Evaluating the Efficiency of Fine Coal Washing Using Gravity Separation Methods

2019 ◽  
Vol 2 (4) ◽  
pp. 497
Author(s):  
Agnes Modiga ◽  
Ndabenhle Sosibo ◽  
Nirdesh Singh ◽  
Getrude Marape
Keyword(s):  
South Africa ◽  
Calorific Value ◽  
Ash Content ◽  
Gravity Separation ◽  
Export Market ◽  
Heavy Liquid ◽  
High Mass ◽  
Fine Coal ◽  
Classifier Performance ◽  
Uranium Industry

Coal mining and washing activities in South Africa often lead to the generation of fine and ultra-fine coal which is in most cases discarded due to high handling and transportation costs. Studies conducted revealed that a large quantity of these fines have market acceptable calorific values and lower ash contents. In order to reduce fines discarded, processes have been developed to re-mine and process the fine coal discards with the aim of improving the calorific value, adding them to coarse washed coal to increase the yield as well as pelletizing the fines so as to meet the market specifications in terms of size. The goal of this study was to evaluate the efficiency of fine coal washing using gravity separation methods and comparing the products thereof to the market specifications with regards to the calorific value and the ash content. Coal fines from the No.4 lower seam of the Witbank coalfield in South Africa resulting from a dry coal sorting plant were subjected to a double-stage spiral test work, heavy liquid separation and reflux classifier test work respectively. The reflux classifier achieved products with low ash content and an increased calorific value, at high mass yields. At higher fluidization water flowrate, the reflux classifier performance was superior to that of the spirals with products of lower ash content and higher calorific value. At low cut point densities, heavy liquid separation yielded the cleanest products with very low ash content but at much lower mass yields. As the density increased, the mass yields increased with the ash content while the calorific value decreased. Most of the products from the different processes met most of the local industries’ specifications but none of them met the export market as well as the gold and uranium industry specifications due to the high ash content.

ANALISIS PERBANDINGAN KUALITAS BATUBARA DI LOKASI PENAMBANGAN DAN STOCKPILE DI PT FIRMAN KETAUN PERKASA

2019 ◽  
Vol 4 (01) ◽  
Author(s):  
Andri Toding ◽  
Agus Triantoro ◽  
Riswan Riswan
Keyword(s):  
Calorific Value ◽  
Ash Content ◽  
Total Sulphur ◽  
Fine Coal

Batubara yang ditumpuk di stockpile berasal dari beberapa front atau lokasi penambangan yang berbeda-beda kualitas. Permasalahan yang timbul dari kualitas batubara ini adanya komplain dari pihak konsumen terhadap kualitas batubara yang menyimpang dari kesepakatan standar kualitas batubara yang telah ditentukan. Tujuan dari penelitian ini yaitu menghitung besarnya perbedaan parameter kualitas batubara, melakukan penanganan dan mencari penyebab perbedaan kualitas batubara.Metode yang digunakan dalam penelitian ini adalah dengan melakukan analisis parameter kualitas batubara pada stockpile dan membandingkan dengan hasil analisis parameter kualitas batubara di lokasi penambangan berdasarkan hasil analisis kualitas dari titik bor, serta menganalisis faktor-faktor yang dapat mempengaruhi secara langsung maupun tidak langsung terhadap perbedaan kualitas batubara pada kedua lokasi tersebut. Dilakukan secara lansung dilapangan untuk melihat aktivitas penambangan untuk mengetahui cara penanganan batubara dilokasi penambangan agar tidak terkontaminasi material lain dan cara pengolahan batubara di stock ROM dan penanganan batubara di stockpile untuk mengetahui secara langsung penyebab perbedaan kualitas batubara selama bulan Agustus Tahun 2016.Adapun perbedaan yang terjadi pada  kualitas batubara di lokasi penambangan dan di stockpile yaitu total moisture, ash content, total sulphur dan calorific value. Terjadinya  perbedaan kualitas batubara ini disebabkan oleh faktor-faktor sebagai berikut : kondisi sampling yang tidak baik, aktivitas penambangan, fine coal akibat proses penanganan, ukuran batubara yang tidak seragam dan penanganan batubara di stockpile. Perbedaan kualitas batubara pada lokasi penambangan dan stockpile  seperti TM ar (0,99% – 3,85%), Ash  adb (0,04% – 4,29%), Ash ar  (0,02% – 3,69%),  TS adb (0,01% – 1,25%),  TS ar (0,01% – 0,94%),  CV cal/gr adb (10 – 562), CV cal/gr ar (10 – 355). Kata Kunci :  Lokasi Penambangan, Stockpile, Kualitas Batubara

scholarly journals SYNGAS DERIVED FROM CATALYTIC GASIFICATION OF FINE COAL WASTE USING INDONESIAN POTENTIAL CATALYST

2021 ◽  
pp. 1-8
Author(s):  
Muhammad Faizal ◽  
Nabila Aprianti ◽  
Muhammad Said ◽  
Subriyer Nasir
Keyword(s):  
Clean Energy ◽  
Raw Material ◽  
Feed Ratio ◽  
Coal Waste ◽  
Gas Composition ◽  
Catalytic Gasification ◽  
Heating Value ◽  
Fine Coal ◽  
Gasification Process ◽  
Gasification Efficiency

Fine coal waste from the coal mining process has not been used as clean energy even though the amount is very abundant in the world. The conversion of fine coal to syngas is a new way to increase the value of fine coal. Syngas composition, gas ratio, gasification efficiency, and heating value of syngas have been determined under various conditions of temperature (550-750 °C) and bentonite catalyst ratio (0-0.25). The results indicate that fine coal is the suitable raw material for the gasification process. At the highest temperature (750 °C), the gas composition consists of 42.6 vol% H2, 19.1vol% CO, 19.5 vol% CH4, and 7.9vol% CO2. The best performance was achieved when the catalyst/feed ratio is 0.25 with the gas composition of 54.3vol% H2, 26.2vol% CO, 23.8 vol% CH4, and 3.5vol% CO2, heating value and gasification efficiency were 19.72 MJ/Nm3 and 72.27% at 750 °C.

scholarly journals Recovery of Fine Coal Grains from Post-Mining Wastes with Use of Autogenous Suspending Bed Technology

2020 ◽  
Vol 28 (4) ◽  
pp. 220-227
Author(s):  
Daniel Kowol ◽  
Haldun Kurama
Keyword(s):  
Grain Size ◽  
Ash Content ◽  
Mining Waste ◽  
Mineral Deposits ◽  
Coal Waste ◽  
Mining Wastes ◽  
Test Results ◽  
Waste Dump ◽  
Secondary Mineral ◽  
Fine Coal

AbstractIn addition to rock waste post-mining waste dump sites also contain coal grains justifying treating the dump sites as secondary mineral deposits. The article presents the results of laboratory tests aimed at determining the possibility of using suspending bed technology to separate a combustible substance from post-mining waste of a 4-0 mm grain size. The test results showed the possibility of obtaining good quality coal concentrates from coal waste of a grain size of 4-1 mm. The need for desludging and densifying the feed for the classifier with an autogenic suspending bed in the case of coal waste beneficiation in a wide 4-0 mm grain size justifies the use of a two-chamber device or two separate classifiers for narrower grain size classes. Concepts of systems for the recovery of fine coal grains providing the use of the classifier with autogenous suspending bed for the density distribution of feeds with high ash content are presented. The concepts were developed for beneficiation of the material in a 4-0 mm grain class.

Utilization of Fine Coal Waste as a Fuel Briquettes

2013 ◽  
Vol 33 (4) ◽  
pp. 194-204 ◽  
Author(s):  
Gabriel Borowski ◽  
Jan J. Hycnar
Keyword(s):  
Coal Waste ◽  
Fine Coal

scholarly journals Algal Lipids as Biocollector for Recovery of Coal from Fine Coal Waste by Froth Flotation

Minerals ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 70
Author(s):  
Kudzai G. Chiodza ◽  
Susan T. L. Harrison ◽  
Marijke A. Fagan-Endres
Keyword(s):  
Oleic Acid ◽  
South African ◽  
Fatty Acid Methyl Esters ◽  
Methyl Esters ◽  
Froth Flotation ◽  
Optimum Operating ◽  
Coal Waste ◽  
Fine Coal ◽  
Acid Methyl ◽  
Better Than

Raw algal lipids (RALs) and their derivatives (fatty acid methyl esters; FAMEs) were investigated as biocollectors for the recovery of coal from ash-rich fine coal waste by froth flotation. Testing was done on fine coal discards from two South African sites—a high ash (50%), high sulphur (5.7%) sample and a lower ash (26%), low sulphur (0.91%) sample. The yield and recovery of combustibles on using biocollectors was similar to, or better than, with oleic acid, a polar collector demonstrated as a good collector in previous research. The RALs and FAMEs reduced the ash and sulphur content of the combustible fraction of the high ash-high sulphur sample to between 23–28% and 1.9–3.3%, respectively. The chemical modification of RALs to FAMEs provided potential for improving the selectivity of the recovery of combustibles. It also resulted in a change of the optimum operating pH, with RALs yielding better results at the natural pH of the sample (pH 2.7), while FAMEs performed best at pH 7.

scholarly journals Deep processing of organic mass of finely dispersed coal waste

2021 ◽  
Vol 315 ◽  
pp. 02014
Author(s):  
Vasilii Murko ◽  
Marina Baranova ◽  
Irina Grishina
Keyword(s):  
Organic Liquid ◽  
Motor Fuel ◽  
Coal Waste ◽  
Deep Processing ◽  
Organic Mass ◽  
Organic Part ◽  
Secondary Use ◽  
Fine Coal ◽  
Liquefaction Process ◽  
Effective Use

The technological and technical possibility of deep processing of coal by its liquefaction using the methods of extreme mechanochemical and physical effects has been determined; recommendations have been developed for the applied use of the obtained materials in heat power engineering. The organic part of the solid mass of the prepared coal-oil suspension, which has turned into a relatively heavy organic liquid, can be used as a boiler or motor fuel, as well as a feedstock for the production of various hydrocarbon liquids. The resulting mixture of hydrocarbons can be subjected to rectification to obtain hydrocarbon fractions for the production of plastics, oil fractions and the entire spectrum of hydrocarbons for secondary use. The effective use of the above substances will make it possible to obtain not only economic, but also a significant environmental effect. The possibility of liquefying the organic mass of coal using decalin as a hydrogen donor is shown. It was found that the addition of 3% decalin improves the liquefaction process during cavitation treatment. Liquefaction of the organic mass of coal is accompanied by the splitting of the structures of macromolecules of organic substances of coal into aromatic fragments with a lower molecular weight. It should be noted that the developed technology will solve the problem of increasing the value of the final coal product, including by involving unused fine coal sludge into circulation.

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