scholarly journals Research on the thermal decomposition of Mongolian Baganuur lignite and Naryn sukhait bituminous coal

2016 ◽  
Vol 16 ◽  
pp. 22-29
Author(s):  
A. Ariunaa ◽  
D. Bernhardt ◽  
M. Beckmann ◽  
K. Gebauer ◽  
N. Hack ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Elemental Composition ◽  
Bituminous Coal ◽  
Fixed Bed ◽  
Low Rank ◽  
Gasification Reactivity ◽  
Ash Melting ◽  
Proximate And Ultimate Analysis ◽  
Co2 Gasification Reactivity

The technical characteristics, elemental composition of the organic and mineral matters, ash melting behaviors and carbonization and gasification reactivities of coals from Baganuur and Naryn sukhait deposits were investigated. The results of proximate and ultimate analysis confirmed that the coal from Baganuur deposit can be graded as a low rank lignite B2 mark coal and Naryn sukhait coal is a bituminous G mark one. The carbonization and gasification experiments were performed using TGA apparatus and fixed bed quartz reactor. The data obtained with two experimental reactors showed that Baganuur lignite had lower thermal stability and much higher CO2 gasification reactivity at 950°C as compared to those for Naryn sukhait bituminous coal.Mongolian Journal of Chemistry 16 (42), 2015, 22-29

scholarly journals Study on the washability by using float sink test and thermal decomposition of the Mogoin gol bituminous coal

2020 ◽  
pp. 31-37
Author(s):  
Shagjjav E ◽  
Ariunaa A ◽  
Serikjan Kh ◽  
Purevsuren B
Keyword(s):  
Thermal Decomposition ◽  
Mass Loss ◽  
Bituminous Coal ◽  
Chemical Processing ◽  
Thermal Behaviors ◽  
Ultimate Analysis ◽  
Coal Classification ◽  
Proximate And Ultimate Analysis ◽  
Coal Properties ◽  
Proximate And Ultimate Analyses

The Mogoin gol bituminous coal properties were determined by proximate and ultimate analysis and thermal behaviors performed using a HITACHI TG/DTA7300 thermogravimetry analyzer. Float sink test carried out by Russian standard GOST 4790-93. Results of the proximate and ultimate analyses showed that the coal has Vdaf=30.7%, Ad=10.6%, Cdaf=76.5% and Qdaf=7532 kcal/kg. According to the coal classification, the coal belongs to the J class of bimuminous coal. The rate of mass loss was maximum in the range 483°С. Yields and ash contents of the fraction were γб=49.9 and 5.6% respectively, when for the separation was used heavy liquid with 1.3g/cm3 density. In general, it can be concluded that the Mogoin gol coal belongs to the category of coals with very good washability. Therefore, it will be advantageous and economically viable to use coal concentrate with low-ash for further chemical processing. Могойн голын ордын нүүрсний халууны задралын болон баяжигдах шинж чанарын судалгаа Хураангуй: Дээд ангилалын чулуун нүүрс болох Могойн голын ордын нүүрсний шинж чанарыг техникийн болон элементийн шинжилгээгээр, халуун, дулаан тэсвэрлэх чанарыг термогравиметр HITACHI TG/DTA7300 маркийн багажийн тусламжтайгаар, нүүрсний баяжигдах шинж чанарыг хүнд шингэний ГОСТ 4790-93 стандарт аргаар тодорхойллоо. Нүүрсний техникийн болон элементийн шинжилгээний үр дүнгүүдээс Ж маркийн чулуун нүүрс болохыг баталж байна. Жингийн алдагдлын хурд ДТГ 483°С-ын температурын мужид хамгийн их байв. Хүнд шингэний нягтыг ихэсгэх тутам баяжмалын үнс болон гарц аажмаар ихэсгэх хандлагатай бөгөөд δ=1.3 г/см3 нягттай хүнд шингэнд нүүрсийг баяжуулбал, үнс бага Aб а=5.6%, гарц өндөртэй γб=49.9% баяжмал гарган авах боломж. Иймд бага үнстэй нүүрсний баяжмалыг цаашид гүн боловсруулалтын чиглэлээр ашиглахад давуу талтай, эдийн засгийн ач холбогдолтой байх болно. Түлхүүр үг: нүүрс, термогравиметр, жингийн алдагдал, баяжуулалт, баяжмал, хөвсөн/ живсэн фракц

Structure and CO2 Gasification Reactivity of Char Derived through Pressured Hydropyrolysis from Low-Rank Coal

2019 ◽  
Vol 33 (9) ◽  
pp. 8032-8039
Author(s):  
Weijie Guo ◽  
Yonggang Wang ◽  
Xiongchao Lin ◽  
Guanyu Wang ◽  
Panpan Zheng ◽  
...  
Keyword(s):  
Low Rank ◽  
Low Rank Coal ◽  
Co2 Gasification ◽  
Gasification Reactivity ◽  
Co2 Gasification Reactivity

Non-Isothermal Decomposition Kinetic of Polypropylene/Hydrotalcite Composite

2019 ◽  
Vol 19 (11) ◽  
pp. 7493-7501 ◽  
Author(s):  
Sheng Xu ◽  
Min Zhang ◽  
Siyu Li ◽  
Moyu Yi ◽  
Shigen Shen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Decomposition ◽  
Nitrogen Atmosphere ◽  
Heating Rates ◽  
Decomposition Reactions ◽  
Kinetic And Thermodynamic Parameters ◽  
Málek Method ◽  
Boundary Reaction ◽  
Phase Boundary Reaction ◽  
Thermal Stability Of

P3O5-10 pillared Mg/Al hydrotalcite (HTs) as a functional fire-retarding filler was successfully prepared by impregnation-reconstruction, where the HTs was used to prepare polypropylene (PP) and HTs composite (PP/HTs). Thermal decomposition was crucial for correctly identifying the thermal behavior for the PP/HTs, and studied using thermogravimetry (TG) at different heating rates. Based on single TG curves and Málek method, as well as 41 mechanism functions, the thermal decompositions of the PP/HTs composite and PP in nitrogen atmosphere were studied under non-isothermal conditions. The mechanism functions of the thermal decomposition reactions for the PP/HTs composite and PP were separately “chemical reaction F3” and “phase boundary reaction R2,” which were also in good agreement with corresponding experimental data. It was found that the addition of the HTs increased the apparent activation energy Ea of the PP/HTs comparing to the PP, which improved the thermal stability of the polypropylene. A difference in the set of kinetic and thermodynamic parameters was also observed between the PP/HTs and PP, particularly with respect to lower ΔS≠ value assigned to higher thermal stability of the PP/HTs composite.

Evaluation of CO2 Gasification Reactivity of Different Coal Rank Chars by Physicochemical Properties

2013 ◽  
Vol 27 (12) ◽  
pp. 7287-7293 ◽  
Author(s):  
Xuliang Jing ◽  
Zhiqing Wang ◽  
Qian Zhang ◽  
Zhongliang Yu ◽  
Chunyu Li ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Coal Rank ◽  
Co2 Gasification ◽  
Gasification Reactivity ◽  
Co2 Gasification Reactivity

Combustion characteristics of semicokes derived from pyrolysis of low rank bituminous coal

2012 ◽  
Vol 22 (5) ◽  
pp. 645-650 ◽  
Author(s):  
Wei Qian ◽  
Qiang Xie ◽  
Yuyi Huang ◽  
Jiatao Dang ◽  
Kaidi Sun ◽  
...  
Keyword(s):  
Bituminous Coal ◽  
Combustion Characteristics ◽  
Low Rank

Numerically Study on Combustion and NOx Emission Characteristics in Tangentially Fired Boiler Co-Firing Semi-Coke

2018 ◽  
Author(s):  
Yongbo Du ◽  
Chang'an Wang ◽  
Pengqian Wang ◽  
Qiang Lv ◽  
Defu Che
Keyword(s):  
Bituminous Coal ◽  
Combustion Efficiency ◽  
Low Rank ◽  
Operation Performance ◽  
Combustion Heat ◽  
Practical Utilization ◽  
Excess Air ◽  
Utility Boilers ◽  
Excess Air Coefficient ◽  
Char Burnout

Semi-coke is a specific solid fuel, which is mainly produced by upgrading low-rank coal. The poor reactivity of semi-coke makes a difficulty to its practical utilization in utility boilers. Previous research was mainly focused on the combustion behavior of semi-coke, while the industrial application has to be understood. In this paper, the effect of co-firing semi-coke and bituminous coal on the operation performance of pulverized boiler was numerically studied. The work was conducted on a 300 MW tangentially fired boiler, and the temperature distribution, the char burnout and NOx production were mainly examined. The results indicate that the incomplete combustion heat loss drops with the increase in semi-coke blending ratio. The NOx concentration increases from 186 mg/Nm3 for only firing the bituminous coal to 200, 214, and 255 mg/Nm3, when the blending ratio was 17%, 33% and 50%, respectively. With enhancing excess air coefficient for the co-firing condition, the combustion efficiency got improved, while NOx production increased very slightly. In general, the boiler is well adapted to co-firing semi-coke, and the semi-coke blending ratio of 1/3 with an excess air coefficient of 1.235 is recommended.

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