قائمة طعام
The Preiser Scientific Ash Fusion System is designed to determine ash cone deformation temperatures in coal and coke ash per ASTM Standard D-1857 and ISO Standard 540 (CO/CO2 reducing atmosphere option). The Model PAF 2014 is comprised of a .
Slagging and Fouling Indices Index Formula Slagging or Fouling Propensity Low Mediu m High Severe Ash Fusion Sphere (softening) temperature under reducing conditions >1350 <1350 Base - Acid Ratio <0.4 or > 0.7 0.4 to 0.7 Slagging Factor for bituminous ash (Fe 23 O > CaO + MgO <0.6 0.6 to 2.0 2.0 to 2.6 >2.6 T 250 Temperature EC w here >1400 ...
[PDF]
The amount and nature of the ash and its behaviour at high temperatures affect the design and type of ash-handling system employed in coal-utilization plants. At high temperatures, coal ash becomes sticky (i.e., sinters) and eventually forms molten slag. The slag then becomes a hard, crystalline material upon cooling and resolidification.
The ash fusion temperatures (AFTs) of coal mineral matter at high temperature are important parameters for all gasifiers. Experiments have been conducted in which mixtures of selected coal ashes and SiO2, Al2O3, CaO, Fe2O3, and MgO were subjected to the standard test for ash fusibility. The computer software package FactSage has been used to calculate the liquidus temperatures of coal ash ...
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 temperature as possible, preferably 1,600 °C (2,910 °F). The following temperatures are recorded;
Jan 14, 2019 · Bituminous coal can be categorized further by the level of volatile matter it contains high-volatile A, B, and C, medium-volatile, and low-volatile. Volatile matter includes any material that is liberated from the coal at high temperature. In the case of coal.
Ash fusion, also called fusibility, is a test to determine how the ash residue remaining from combustion of a coal will react in a furnace or boiler. In this test, coal ash is put into conical molds as specified in ASTM method D1857-04 guidelines and procedures (American Society .
[PDF]
Sep 09, 2014 · In the present investigation, few Indonesian coal samples have been selected to find out the direct effect of ash chemical composition and ash fusion temperatures. Experimental: The composition of several coal ashes were determine by ASTM D6349-09 method using Perkin Elmers Optima 700 DV, ICP-OES. The sample digestion was carried out in a ...
The extent of coal ash slag penetration and refractory brick dissolution depends on the slag viscosity, the gasification temperature, and the composition of slag and bricks. We measured the viscosity of several synthetic coal ash slags with a high-temperature rotary viscometer and their ash fusion temperatures through optical image analysis.
Fuels with lower ash fusion temperatures require more precise combustion tuning and increased sootblowing to mitigate slag deposits. Let's take a look at the coal ash fusion D1857 analysis shown ...
The elevated temperatures of the gas leaving the furnace often results in ash entering the convection passes that is above its fusion temperature. Thus this ash will deposit on the superheat and reheat surfaces and further reduce the ability of the furnace to make steam conditions.
Good quality coal having more gross calorific value, less ash content, less mineral content in the coal, and ash fusion temperature above 1500 C must be used to avoid clinker formation. Regular watch must be done on poking. Precautions may avoid clinker formation and its deposition in boilers. Precaution is the best solution.
[PDF]
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 [1]. 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.
Apr 08, 2011 · Re: Ash fusion temperature. Dear Mr.Ted, As per my understanding the higher the ash fusion temperatures better will be its performance in terms of fouling and slagging in power plant boiler tubes. High alkali containing fly ashes generally do have low ash fusion temperatures.Indonesian coal which is largely used in power plants.
Ash fusion temperature is a concern for some operators. Where ash fusion temperature is low there is a risk of lance blockage caused by the formation of slag deposits near the tip of the injection lance. Residual coal moisture after drying affects the transport characteristics and coke replacement ratio of pulverised coal.
Sep 19, 2018 · 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 drop, and an unstable gasifier operation (Van Dyk et al. 2001).
[PDF]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 drop, and an unstable gasifier operation (Van Dyk et al.
Apr 06, 2017 · 5E-AF4115 Ash Fusion Determinator is used to determine ash cone deformation temperatures in coal ash, coke ash and mold powders automatically, which are critical to the boiler functioning properly ...
CORRELATING THE SLAGGING OF A UTILITY BOILER WITH COAL CHARACTERISTICS Rod Hatt Coal Combustion, Inc. Versailles, KY 859-873-0188 ABSTRACT This paper will describe how a utility was able to correlate intermittent slagging problems a boiler was experiencing with coal ash chemistry. The coal ash fusion temperatures alone were not sufficient to be
May 08, 2011 · re Re: Ash fusion temperature. Dear sir, Pl send me formula for calculation on ( [email protected]) Can we used for calculation for pet coke ash fusion temp . Any relation of high sulphur coal have low fusion temp. With regards. gks. Reply
[PDF]
Al, Fe, and Si did not change with temperature relative to Ca which was assumed to be constant. Sintering of the ash occurred, but fusion of the ash did not occur. hr the 600°C ash CaCO 3 and K 2Ca(CO 3) 2 were identified, whereas in 1300OC ash CaO and MgO were the main compounds. The implications for ash
The Ash Fusion Temperature used to analyze coal ash is suitable for the furnace in which it or will become fluid at some temperature. This test performs the actual Melting / Fusion of the Ash Cone under controlled conditions and checks the corresponding Deformation Temperature of the sample Coal Ash.
[PDF]
Al, Fe, and Si did not change with temperature relative to Ca which was assumed to be constant. Sintering of the ash occurred, but fusion of the ash did not occur. hr the 600°C ash CaCO 3 and K 2Ca(CO 3) 2 were identified, whereas in 1300OC ash CaO and MgO were the main compounds. The implications for ash
Apr 08, 2011 · Re: Ash fusion temperature. Dear Mr.Ted, As per my understanding the higher the ash fusion temperatures better will be its performance in terms of fouling and slagging in power plant boiler tubes. High alkali containing fly ashes generally do have low ash fusion temperatures.Indonesian coal which is largely used in power plants.
• 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 coal .
relationship to coal ash chemistry, melting & slagging properties, and fusion temperature. There are not distinct melting points for coal ash like with ice or other pure compounds, s o when melting is mentioned it is used to represent a decrease in viscosity, rather than a melting point. When coal ash melts it occurs on both a large scale and a
[PDF]
The ash fusion temperatures (AFTs) of coal mineral matter at high temperature are important parameters for all gasifiers. Experiments have been conducted in which mixtures of selected coal ashes and SiO2, Al2O3, CaO, Fe2O3, and MgO were subjected to the standard test for ash fusibility. The computer software package FactSage has been used to calculate the liquidus temperatures of coal ash ...
[PDF]
The ash fusion temperatures (AFTs) of coal mineral matter at high temperature are important parameters for all gasifiers. Experiments have been conducted in which mixtures of selected coal .
The fusion temperature tests have been used to evaluate the melting and slagging behavior of coal ash for years. However, the coal ash fusion temperature alone is not sufficient to be able to ...
The ash fusion temperatures (AFTs) of coal mineral matter at high temperature are important parameters for all gasifiers. Experiments have been conducted in which mixtures of selected coal ashes and SiO2, Al2O3, CaO, Fe2O3, and MgO were subjected to the standard test for ash fusibility. The computer software package FactSage has been used to calculate the liquidus temperatures of coal ash ...
