How is coal moisture determined?

Moisture content is an important parameter in coal analysis. The moisture value given for a proximate analysis is the moisture measured as mass lost from a sample under specified conditions after heating in a moisture oven to 104 to 110°C (ASTM method D3173-11; American Society for Testing and Materials, 2013, p.

Which method is used to determine the moisture percent in coal?

moisture but residual moisture after air dried loss is done. I. Reference Method: Test done with laboratory sample of coal, ground to pass 212-micron IS sieve. to the residual moisture as the sample is air dried.

What is total moisture content?

The moisture content in aggregate is used to determine the binder content for HMA during production of the mixture in a plant. The procedure requires that a known amount of aggregate be obtained, the aggregate heated to remove the moisture, and the percentage of moisture determined.

How is the quality of coal determined?

The most common types of coal (bituminous, lignite, and anthracite) can be differentiated by their diverse physical and chemical properties….Proximate Coal Analysis (Physical Testing)

What is the difference between total moisture and inherent moisture in coal?

Theoretically, inherent moisture is that which a coal can hold when in equilibrium with an atmosphere of 100 percent relative humidity. It is also used for estimating free or surface moisture, since total moisture is equal to the sum of the inherent moisture and the free moisture.

What is the principle of moisture content?

The principle of the thermogravimetric method of moisture content determination is defined as the weight loss of mass that occurs as the material is heated. The sample weight is taken prior to heating and again after reaching a steady-state mass subsequent to drying.

What is the temperature maintain in the determination of percent moisture in coal?

Inherent moisture content is determined by heating an air-dried coal sample at 105°–110°C (221–230°F) under specified conditions until a constant weight is obtained.

What is moisture content determination?

Moisture content is, simply, how much water is in a product. It influences the physical properties of a substance, including weight, density, viscosity, conductivity, and others. It is generally determined by weight loss upon drying.

Why is moisture content determined?

Moisture content of the food material is important to consider the food is suitable before the consumption, because moisture content affects the physical, chemical aspects of food which relates with the freshness and stability for the storage of the food for a long period of time and the moisture content determine the …

What are the classifications of coal?

Coal is classified into four main types, or ranks: anthracite, bituminous, subbituminous, and lignite.

How do you calculate calorific value of coal?

MJ/kg = (Btu/lb) X 0.002326 For example, a coal with a calorific value of 14,000 Btu/lb has a metric calorific value of 32.56 MJ/kg.

What is equilibrium moisture in coal?

The moisture content retained at equilibrium in an atmosphere over a saturated solution of potassium sulfate at 30 degrees C, and 96\% to 97\% relative humidity.

What is moisturemoisture in coal?

Moisture i n coal consists of inherent moisture (IM) and surface moisture (SM). There is no simple and reliable method of d etermining the water of hydration of mineral matter. The average value of 8 \% of the ash is used as t he value for water of hydration of mineral matter in coals in the United States.

What are the factors affecting the quality of coal samples?

This is dependent on the tightness of the sealing of sampling containers, the level of moisture content in the sample, the ambient conditions, the type of coal and the reduction and division procedures used. This is described in detail in ISO 13909-4 or ISO 18283.

How does moisture affect the efficiency of combustion?

Moisture absorbs heat, so high moisture content in coal reduces the relative efficiency of heating when a coal is combusted. This is why low-rank, high-moisture coals have lower calorific values (Btu/lb) than high-rank, low-moisture coals.

What is total moisture in ASTM?

Total moisture: All moisture (water) in and on a coal sample that can be removed through heating in an oven at 107°C according to ASTM methods D3302-12 and D2961 (American Society for Testing and Materials, 2013, p. 518–525, 485–486, respectively). It is essentially equal to the inherent moisture plus the surface moisture.