Briquetting of coal
ТОВ «Компания ЛТС» (Украина) является официальным представителем ТОО «ТД «Майкубен Комир» (Казахстан) и эксклюзивным дилером по реализации угля Майкубенского угольного разреза.
Our company gained professional experience, reputation of reliable partner and strong connections at many coal producers of Russia, Ukraine and Kazakhstan. Main activity of the organization is wholesale trade of coal on domestic market of Ukraine. The deliveries are made in many regions mainly for housing and communal needs. We have big and what is important positive experience of participation in different competitions and bids for coal supply. On this page there is information that can help you to define practicability for purchasing this or that type of coal as well as to get information about characteristics of the products we supply, select the coal you need. We hope sincerely that having made agreement and received the products supplied by our Company you will be satisfied with the quality of work and interested in further cooperation with PE “Lugan’topservice”. Grades of sold coal: Anthracite -AC, AM, AO, AKO;
Black coal - Д, Г, Т, ОС, СС;
Brown coal - 3Б.Types of Coal
1. Brown coals contain a lot of moisture (43%) and so have understated heating value. Besides they contain big quantity of volatile matters (up to 50%) and thanks to this ignite quickly. They are formed from fossil organic residues under pressure of load and under impact of excessive temperature on the depth around 1 km.
2. Black coals contain up to 12% of moisture (3-4% internal) so have higher heating value. They contain up to 32% of volatile matters, at the account of this they ignite rather well. They are formed from brown coal on the depth around 3 km.
3. Anthracites are almost completely (96%) consist of carbon. They have the largest heating value but ignite badly. They are formed from black coal under growth of pressure and temperature on the depth around 6 km. They are used mainly in chemical industry.To designate grades of coals aimed for using in heat power engineering the following scheme is used:
Rank of coal
The rank of coal can end with abbreviation OK (OK1, OK2) designating oxidation rate. Also depending on concentration rate the coals are divided into concentrates, industrial products and slacks. Concentrates are usually used for boiler-houses and for receiving electric power. Industrial products are usually used for the needs of steel industry. It is possible to produce briquettes from slacks and sell them to population for individual utilization.
Depending on the rate of carbonification (metamorphism) there are brown coals, black coals and anthracites. Brown coals have the lowest heating value while anthracites have the highest one. Black coals have the most favourable ratio of price and specific heat of combustion.
Coals of ranks Д, Г and anthracite as a rule are used in boiler-houses as they can burn without blast. Coals of ranks CC, OC, T are used for obtaining electric power as they have large heating value but combustion of this type of coal is connected with technological difficulties that are justified only in case of the need for large quantity of coal. Ranks Г, Ж are used in ferrous metallurgy for production of steel and cast iron.
Fraction of this rank of coal is defined based on the smallest value of the finest fraction and the largest value of the coarsest fraction indicated in the name of the rank of coal. Thus, for example, fraction of rank ДКОМ (К-50-100, O-25-50, M-13-25) is 13-100 mm. It is possible to define fraction of coal by the rank of coal.
For example, coal of grade Гр. It means that by rank composition it is gas and by grain composition it is ordinary (size of pieces 0-200…300 mm). In this case percentage content of specific classes is not regulated. It can be coal consisting of 90% of large fragments and 10% of chips and vice versa. If the coal is designated ТПК this is non-bituminous coals sorted with the size of pieces from 50 (40) to 200…300 mm. Content of fine (less than 50 mm) fragments should not exceed 15%.
For communal and housing purposes practically all ranks of coal are used with exception of coking (Г, coke, Ж, К, ОС). This coal is quite scarce raw material for chemical-recovery industry, if it is directed for heat and power supply then only in the form of cleaning rejects (industrial product, slack) or unsuitability for coking for some reasons.
Coal of different ranks possesses different properties. It is evident that during burning these differences will be revealed obligatory. And one should know them and take into account when selecting the coal and selecting the burning mode. Organic (combustible) mass of coal is volatile matters and solid (coking) residue. Volatile matters constitute from 60% and more for brown coal up to several per cents in anthracite.
In the process of burning it is possible to distinguish two stages. At the first stage volatile matters escape at the account of thermal destruction. If there is sufficient oxygen these volatile matters burn down quickly giving long flame but insufficient quantity of heat. After that non-volatile (coking) residue burns out. The activity of burning out of non-volatile residue and temperature of its ignition (reactivity) is different for coals with different degree of metamorphism. The higher the degree of metamorphism the higher is reactivity i.e. the higher ignition temperature, the lower combustion rate. Alongside with this the amount of the heat produced by the unit of fuel (heating value) grows significantly.
That’s why the coal of ranks Б, Д, Г starts burning quickly but burns out also quickly because of high emission of volatile matters and high reactivity of coking residue. Such coal often produces a lot of soot and for this in Donbass it received the name “smoky”. The coal of this rank is the most widely spread, it is suitable practically for all furnaces with fuel-bed firing. But high escape of volatile matters and high reactivity determines the need for strict observance of ratio between the volume of furnace space and the quantity of supplied air in case of artificial blow to the amount of fuel loaded at a time. For economical burning this coal should be in small portions so that quickly escaping volatile matters have time for combining with air oxygen i.e. burn down completely. Visually economical burning of coal is expressed in stramineous flame in furnace and light-grey smoke. Incomplete burning out of volatile matters is expressed in crimson flame and black or brownish-black smoke.
It is more difficult to ignite medium and highly metamorphosed coal CC, T, A . But it burns longer and produces more heat. The requirement to the volume of furnace space and to the quantity of fuel loaded at a time are not so strict as for low metamorphosed one as it “works” mainly at the account of coking residue.
But the mode for blow for this coal is particularly important. If air stream is insufficient the burning is slow, it can even stop. In case of excessive air stream the temperature in furniture can rise till critical and there will be heat losses because of its ejection. Visual air abundance is demonstrated in bright-white flame in furnace.