Coal Coke

Asphalt Mixing Plant Used Coal Drying System

In recent years, coal burner in our wide field of application of asphalt mixing, re-integrated energy distribution characteristics of the industry. The context of the current international energy shortage, coal combustion-related R & D and production enterprises on the rational utilization of coal resources in China have made outstanding contributions. Fortunately, we met with coal oil “profits” must also be adequate attention to “meaning” coal requirement is the “righteousness” is absolutely not tolerate any slack. Some people mistakenly think that coal are similar, can be used to burn, or even misunderstood what pulverized coal burner that can burn the equipment! In actual fact, even if the same conditions, as long as a characteristic index change, coal combustion characteristics will be affected. Unqualified application of coal, not only for customers such as broken fire, coke, hard to clean residue, frequent maintenance, bag injury, removal efficiency decreased and so unfavorable factors, is more serious is the quality of road construction may result in decreased life expectancy reduced, resulting in serious consequences such as road renovation. The highway at one section of Yunnan two years ago, the owners asked asphalt mixing equipment prohibit the use of pulverized coal burner, is a true portrayal.

Keywords Coal ash water demands volatile sulfur coal ash fusion characteristics of the new concept of combustion

2006 Shanghai BMW Exhibition South Road Machine Introduced the asphalt mixing plant coal combustion drying system, the latest concept?? NCB series coal fuel burner. This is not just a deep understanding of the combustion characteristics, it is the rational use of energy, ecological balance and environmental protection on an active propaganda. Burner has strict requirements on the coal, the following will be used to introduce a lot of space on coal, could use better ideas industry friends.

NCB series coal fuel burner 1. Quality requirements Generated by coal age, coal rank and other factors, all kinds of coal vary.

1. The basic types of coal

Lignite – formed in the shortest, low calorific value, burning low volatile high, generally above 40%, easily catch fire. But generally higher ash content, ash melting temperature is low, easy slag, water big, big flame burning, black smoke. China’s lignite reserves are small and distribution is extremely uneven, the total coal reserves of the country only about 13%. Generally applicable to lignite gasification, liquefaction and gasoline, diesel and other chemical products deep processing.

Bituminous coal – with a decade longer than lignite, coal rank higher, moderate calorific value and burning, volatile high, generally between 14 ~ 37%, easier to fire. The most abundant bituminous coal reserves in China, accounting for China’s coal reserves total about 75%. Suitable for general industrial applications, is the main driving force for coal.

Anthracite – the longest coal rank, volatile low, typically less than 10%. Hardness, high calorific value, flash point, easy to burn, less smoke when burned, the flame is short, easy to burn. Good quality anthracite coal gasification can be used for raw materials, blast furnace and sinter iron ore, and for casting fuel, fuel, coal is one of the major thermal power generation.

Lean coal – and coal rank are formed in between between anthracite and bituminous coal, volatile matter 10% to 20%, and its performance is better than burning anthracite coal, but still a response to poor performance of coal.

Addition to the above four common coal, the range can be broken down during normal: a long flame coal, non-stick coal, weakly caking coal, gas coal, peat, fat coal, coking coal, lean coal and so on.

2. Impact of conventional indicators of coal combustion

View of the limited space, the paper introduces the concern we have coal volatile matter, moisture, ash, sulfur and ash fusion characteristics and calorific value. Which volatiles, moisture, ash, ash fusion temperature and the heat value of such indicators are seriously affecting the coal combustion.

Volatile – coal thermal decomposition of organic material produced flammable gas or vapor material, mainly to aromatic hydrocarbons and aromatic compounds. It is sort of the main indicators of coal, and was used initially to determine the nature of coal processing and utilization. If improper combustion conditions, high volatile coal combustion is easy to produce unburned carbon, commonly known as “smoke” and produce more carbon monoxide, polycyclic aromatic hydrocarbons, aldehydes and other pollutants, lower thermal efficiency. Therefore, must select the appropriate volatile coal combustion conditions and combustion equipment.

Water – usually in the water outside, within three states of water and crystal water there, all together known as the coal moisture. Generally inherent moisture of coal as coal quality assessment indicators. From coal processing and utilization of view, water is the coal in the “impurity” and more as negative elements: the storage process will be accelerated weathering, cracking, block storage bucket and pipe, and even lead to spontaneous combustion; in the transport, the increase the traffic and transportation, waste capacity; burning, to water heating, gasification and absorb a lot of heat on both hot and reduce the effective heat; in the northern winter, the moisture will enable coal to freeze, resulting in handling difficulties. Only in the briquettes and coal bricks repression, in order to have appropriate water demand shaping.

Ash – the prescribed conditions, complete combustion of coal remaining solid residues. Flammability index of coal ash has a greater influence, the same volatile bituminous, when the ash content increases, the flammability index decreased almost linearly, while the ignition temperature is linearly increased?? Ash higher , the lower the thermal efficiency.

Ash is very complex and different elements directly affect ash fusion characteristics. Low melting point ash of coal combustion, will bring the production operation: easy to slag of molten ash, in coal gasification and combustion, slagging, and so difficult to clean residue. To this end, in evaluation of coal use, coal ash must be strict and controlling the ash fusion temperature.

Sulfur – the harmful impurities in coal, although coal combustion itself is not affected, but its content is too high will cause equipment corrosion and environmental pollution, domestic general industrial requirements with the sulfur bituminous coal is less than 1%.

Addition to the above performance index, the heat value is to be considered an important indicator. Lower heating value of the theoretical combustion temperature drop means that the furnace temperature decline, which pulverized coal ignition and burnout is extremely harmful to the lower heat value of combustion loss often leads to increased deterioration of the economy of the burner. Low heat value to a certain extent, will lead to combustion instability, Fire “blasting”, do not vote can not be stable combustion fuel combustion consequences.

Fineness is thoroughly pulverized coal combustion is a key indicator, in theory, the more detailed the better stability of ignition of pulverized coal, but coal processing and comprehensive consideration of economy and the

About the Author

I am China Manufacturers writer, reports some information about commercial upright freezers , refrigerated foods.

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