Ash level of coal and coal quality evaluation criteria

In the evaluation criteria of quality and combustion of coal. The ash level of coal is one of the most important criteria. So how much ash level of coal is suitable for use? And what are the criteria for evaluating and affecting coal quality? Find out about this issue with the information below.

Indicators affecting the combustion of coal

1. Heat treatment:

The calorific value is the unit of measurement of the amount of heat generated when completely burning 1kg of solid or liquid fuel or 1m3tc of gas fuel. The calorific value is measured in kcal/kg or cal/g. In the evaluation criteria and impact on combustion as well as coal quality, calorific value is a factor of primary importance. The calorific value is divided into 2 main categories as follows:

Low calorific value (Qlvt).
High calorific value (Qlvc).

Nhiệt trị là một chỉ tiêu quan trọng đối với việc đánh giá chất lượng than

There are two ways to determine the calorific value of a fuel is calculation and experimentation.

2. Total moisture:

Each solid fuel has an amount of water inside, which is the moisture content of the fuel. Total moisture is denoted by W and is calculated in%. It is a useless ingredient in fuel. The presence of total moisture will reduce combustion components in the fuel. The combustion process takes extra heat to dry it out. For coal, if the total moisture is too large, it will adversely affect the quality and combustion of coal.

3. Moisture in:

Internal moisture is sustainable moisture that cannot be treated in dry air. Which must be treated at a temperature of 1050C, but this is not the temperature that can completely remove moisture. For some types of clear moisture in the crystalline form, the temperature at 8000C can remove the moisture from the fuel.

4. Ash level:

The Ash level of coal is an element that exists in the fuel and is denoted as A, in%. The ash is the substance in the form of minerals in the fuel when it burns to ash. The presence of ash will reduce the burning components of the fuel. In other words, the ash is the remaining substance after the fuel burns completely. It is for this reason that factories, factories, and companies always give top priority to coal with low ash when choosing. If the ash level of coal is too large, it means that factories, factories, and companies have to spend more on the treatment of ash after use.

Độ tro là những chất còn lại sau khi nhiên liệu cháy hoàn toàn

5. Loading:

Volatile matter is easily combustible gases, it is the product of thermal decomposition of fuel. Volatility is denoted by V and is calculated in%. In other words, when fuel is burned in an oxygen-free environment. The link between the organic elements is broken. That process is called thermal decomposition. Process products are usually volatile substances, including hydrogen, hydrogen carbide, carbon oxides. Volatility is also a factor affecting combustion and coal quality is not small.

How much ash level of coal is suitable for use?

According to LEC Group's coal exports. The ash level of coal will generally adversely affect the use of fuel. In addition to reducing the calorific value of coal, the ash also greatly affects the burning properties of coal such as abrasion of the pipe surface to absorb heat, fouling, reducing the coefficient of heat transfer through the pipe wall. Also, the ash level greatly affects the working process of fire equipment.

Độ tro của than nhìn chung sẽ gây ảnh hưởng không tốt đến quá trình sử dụng nhiên liệu

Therefore, when choosing coal to put into use. The interest in ash is indispensable. So how much is the ash level of coal, can it ensure that the use process is not affected too much? The answer will be between 15% and 30% if the ash level o the coal exceeds this level will greatly affect the use process.

With the information provided by LEC Group above. Hopefully, it partly clarifies and provides the amount of information related to the ash level of coal. If you are looking for a quality coal supplier with stable supply and reasonable prices. Please contact LEC Group immediately to get the best support!

LEC GROUP

Head Office: Road 4, Phu My 1 Industrial Zone, Phu My Ward, Phu My Town, Ba Ria - Vung Tau, Vietnam.

Add: No. 28 Thao Dien Street, Thao Dien ward, District 2, Ho Chi Minh City, Viet Nam.

Hotline: (+84) 938 588 136 & (+84) 909 800 136.

Email: info@lecvietnam.com & thao.nguyen@lecvietnam.com

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