The Study on the Effect of Desulfurized Gypsum CaSO4 on
The main component of this thesis is to study desulfurization gypsum CaSO4 as ash melting behavior modifier key research CaSO4 of mixing the ash fusion temperature , provide a new approach for the desulfurization gypsum resource . Two typical coal ash as a raw material , the use of a fully enclosed high-temperature tube furnace , respectively, in the weak reducing and oxidizing atmosphere
Ash Fusion Temperature an overview | ScienceDirect Topics
This temperature is an important parameter for the design and operation of gasification systems, for those that operate below the ash fusion temperature so as not to incur fusion, sintering, or clinkering of the ash, as well as those gasification systems that operate above the ash fusion temperature to promote slag production.
Coal assay Wikipedia
Ash fusion test. The behaviour of the coal's ash residue at high temperature is a critical factor in selecting coals for steam power generation. Most furnaces are designed to remove ash as a powdery residue. Coal which has ash that fuses into a hard glassy slag known as clinker is usually unsatisfactory in furnaces as it requires cleaning
Ash Fusion Temperatures
Ash fusion temperatures give an indication of the softening and melting behavior of fuel ash. These temperatures are widely cited in fuel specifications for boilers despite a relatively poor record of correlating with slagging or fouling behavior.
The effects of leaching and floatation on the ash fusion
The effects of leaching and floatation on the ash fusion temperatures of three selected lignites. Ash fusion temperature measurements were carried out by using a HR-A5 ash fusion point determination apparatus with a maximum temperature of 1500 °C. The measurements were performed following the Chinese standard procedures (GB/T219-1996). This procedure involves heating an ash cone with a
Understanding the Business of Coal Ash Fusion
24/07/2017· Coal Slags and Ash Fusion Temperatures The Ash Fusion Temperature, AFT, test became popular in the 1920’s as a way to judge clinkering
Ash fusion temperature Dissertation
The Study on the Effect of Desulfurized Gypsum CaSO 4 on Modify Behavior of Coal Ash Fusion Teusion Temperature, GaoLing/East China University of Science and Technology,1/67; Study on Effect of Coal Ash Chemical Composition on Ash Fusion Behaviors, MengYing/Anhui University of
The chemical composition of tertiary Indian coal ash and
composition of coal, and ash fusion temperatures (AFTs) which are important parameters for the coal industry. The AFT partially reﬂects the extent of ash agglomeration during coal conver-sion, e.g., combustion, gasiﬁcation, liquefaction, and ash-utilization processes. The formation of melts, sinters, and slag in combustion and gasi-
Experimental study on ash fusion characteristics of
In this study, ash fusion characteristics (AFC) of biomass red pine, corn straw, Bermuda grass and bamboo are investigated. Results of this study show that ash melting temperatures are higher when samples are ashed at 815 °C than at 600 °C, but the differences are small.
Effect of SiO2/Al2O3 on fusion behavior of coal ash at
01/04/2017· The fusion behavior of ash and slag is critical for coal selection and operation of boilers and gasifiers, and it is required to understand the ash fusion behavior of coal with different ash composition. The ash fusion behavior can be evaluated by different methods including ash fusion temperature (AFT) test and thermomechanical analysis of ash.
What is Gypsum Board? – Gypsum Association
Gypsum board is the technical product name used by manufacturers for a specific board with a gypsum core and a paper facing and may be further described as follows: Regular Gypsum Board – a gypsum board with naturally occurring fire resistance from the gypsum in the core; or
Prediction of coal ash fusion temperatures using
at temperatures below the melting point of the bulk coal ash (Seggiani and Pannocchia 2003). The coal ash fusion at a low temperature, encourages the formation of a clinker that gathers around the heat transfer pipes and thereby corrodes the furnace components. It is well-known that the ash clinkering may lead to channel burning, pressure
Resource-efficient fuel additives for reducing ash related
2% gypsum, 0.25% FeS and 3% coal fly ash minimises the high temperature corrosion risk (based on molar 2S/Cl ratio). An improved ash melting behaviour can be expected with addition of gypsum and coal fly ash (optical evaluations and TEC). The addition of 2% gypsum
Ash fusion temperature Page 1 of 3
08/04/2011· Ash fusion temperature. 1.What is the significance of solid fossil fuels ash fusion temperature on kiln burning process? 2.What is the typical value of ash fusion temperature of Indonesial and South African Bituminous coal? Reply. Know the answer to this question? Join the community and register for a free guest account to post a reply.
Analysis of Gypsum Moisture Content AZoM
The MAX ® 5000XL testing results show good agreement with conventional testing results in the case of free and bound moisture for both products, as well as ash content for the wallboard. The purity factor equation built into the MAX ® 5000XL determined the purity of the gypsum as 92.35% for the wallboard, and 97.71% for the synthetic gypsum
What is the effect of ash fusion temperature of coal in
Fusion temperatures are measured over short time periods while heating ash at a rate of 8 +/- 3 ºC (15 +/- 5 ºF) per minute whereas ash deposits typically accumulate for hours and are formed
PREDICTION OF BIOMASS ASH MELTING BEHAVIOUR –
100°C. In the case of miscanthus and beech ash the prediction was with a deviation of around 200°C less precise. Flow temperatures measured as per standard test (DIN 51730) show generally a good agreement with the TEC fusion temperatures at 70 wt% of molten fraction (T70) for straw, miscanthus and bark ash. In case of beech ash is the TEC
Ash-related issues during biomass ScienceDirect
Generally, ash fusion testing is conducted with an automatic ash fusion temperature analyzer, which mainly consists of a temperature controllable electric heating furnace and a high-precision digital read-out and photographic record camera . IDT, ST, HT, and FT are identified from the ash
Energies 2015 OPEN ACCESS energies
generally require pulverized coal with a high ash fusion temperature to prevent slagging, whereas the liquid-state slag-tap boilers require a low ash fusion temperature . Coal-fired power plants use the method of additive blending or coal blending to meet ash fusibility and other requirements, such as reducing slagging and ash deposition
Prediction of biomass ash fusion behaviour by the use of
Ash fusion temperature(AFT) testing is a widely used laboratory technique in this regard, since it gives an indication of the melting behaviour of ash with respect to temperature. While ash fusion measurements take into account visual changes such as change in shape of specimen
(PDF) Effect of SiO2/Al2O3 on fusion behavior of coal ash
The liquidus temperature (Tliq) of coal ash is above the temperature at which the last solid phase disappeared. Tliq of coal ash slag is widely used to evaluate ash fusion and flow behaviors.
Lithium based Borate Fusion of Gypsum/High Sulfate
Lithium based Borate Fusion of Gypsum/High Sulfate Samples: A New Approach. Abstract . By Donald J. Broton. Abstract. Manufacturing portland cement requires chemical analysis of raw materials, clinker, and cement. Producing gypsum calibration standards by pressed powders or glass beads using sodium tetraborate creates additional calibration curves which must be maintained by drift correction
RELATIONSHIP BETWEEN ASH FUSION TEMPERATURES
relationship between ash fusion temperatures (aft) and coal mineral matter in some turkish coal ashes Article in Asian Journal of Chemistry 21(3) · March 2009 with 528 Reads How we measure 'reads'
Coal Properties and its influence on Boiler Pankaj Ekbote
• Fusion characteristics of Ash is estimated from the Initial Deformation Temperature, Hemispherical Temperature and Fusion Temperature of the ash • Ash oxide analysis is commonly used for analysis of ash composition. • Ash analysis is used to characterize the slagging and fouling potential of
Analysis of Coal Ash
Ash fusion temperatures are determined by heating a prepared sample of molded coal in a high-temperature furnace to temperatures exceeding 1,000 oC in both reducing and oxidizing conditions. The cone or pyramid of molded ash is monitored as the temperature increases. The four critical ash softening temperatures are determined by monitoring the increasing deformation of the sample as it
Ash Fusion Analyzer-AFT Manufacturer & Supplier, Ash
Ash Fusion Analyzer-AFT Advance Ash Fusion Tester is used for checking the Fusion Temperature of Coal and Coke Ash. The behaviour of the coal's ash residue at high temperature is a critical factor in selecting coal for boilers and furnaces.
What is ash fusion temperature? Quora
28/03/2018· Ash fusion temperatures are determined by viewing a molded specimen of the coal ash through an observation window in a high-temperature furnace. The ash, in the form of a cone, pyramid or cube, is heated steadily past 1000 °C to as high a temperat...
Effect of SiO2/Al2O3 on fusion behavior of coal ash at
Full Length Article Effect of SiO 2/Al 2O 3 on fusion behavior of coal ash at high temperature Tinggui Yana,b, Jin Baia,⇑, Lingxue Konga, Zongqing Baia, Wen Lia, Jiang Xuc a State Key Laboratory
Experimental Studies on Decomposing Properties of
Ash Fusion Properties and Mineral Transformation Behavior of Gasified Semichar at High Temperature under Oxidizing Atmosphere. Energy & Fuels 2017, 31 (12) , 14228-14236. DOI: 10.1021/acs.energyfuels.7b02756. Xiaodan Yan, Liping Ma, Bin Zhu, Dalong Zheng, and Yan Lian .
Ash related Issues in Biomass Combustion
Bill Livingston provided an overview of the major ash related issues in biomass combustion. Within ThermalNet, WP2D particularly focuses on ash related issues in biomass combustion. A key deliverable is a report summarizing the issues, which is currently available in draft for comments.