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composition of coal briquettes

how to make charcoal briquettescomponents and process | fote machinery

how to make charcoal briquettescomponents and process | fote machinery

Charcoal briquette is a kind of fuel made by charcoal powder. Compared with traditional fuels, charcoal briquettes can not only generate heat continuously but also produce no smoke and odor during combustion.

Therefore, it has been widely used in domestic and industrial applications in recent years and has become the most popular fuel in many countries such as Kenya, the Middle East, Uganda, India, etc.

With the increase of its economic benefits, the charcoal briquettes process has become one of the hottest processing industries. So, what are the ingredients of charcoal briquettes and how to make charcoal briquettes?

The charcoal briquette is mainly composed of two parts, the charcoal which is used to provide heat and the minor ingredients. Charcoal is the product of incomplete combustion of wood or wood raw materials or pyrolysis under the condition of air isolation.

Charcoal accounts for more than 70% of the entire charcoal briquettes. As the combustion material providing heat, the raw materials for charcoal can be various woods, such as beech, birch, hard maple, pecan and oak.

The charcoal is mainly processed by the kiln. In general, the charcoal produced and extinguished in the kiln is called black wood charcoal. It has the advantage of being easy to ignite, but it is easy to explode during burning with a short burning time and much smoke.

While the white wood charcoal can be oxidized and generate white ash after being carbonized, removed from the kiln and quenched with wet sand. Compared with black wood charcoal, it has a harder texture.

The charcoal briquette cannot fully contact with oxygen during the combustion process, so the accelerator is needed to accelerate the combustion. The most suitable accelerator is the nitrate, which can not only provide oxygen to accelerate combustion but also heat during combustion.

By observing the degree of turning white, we can judge the burning degree of the charcoal briquette. In addition, because the white ash is not combustible, it can effectively extend the burning time.

Numerous facts show that starch has the best performance as a binding material. After it's gelatinized, a thick paste can be formed so that the charcoal powder is stuck together to facilitate the later briquette.

After the end of combustion, close the air inlet, and after one to two hours of exhaust, close the exhaust hole. After a two-week cooling period, empty the kiln and crush the carbonized wood (charcoal).

Use a hammer crusher or roller crusher to crush the carbonized wood. Although different types of wood such as bark, dry wood chips, wet wood and so on should be crushed to different sizes, generally they can be crushed into pieces of charcoal to 5mm below to make high-quality charcoal briquettes.

Then a drying process is needed. If the water content exceeds the empirical upper limit, the temperature will rise and the volume will expand suddenly, which is easy to cause an explosion. If the moisture content is too low, it will be difficult to mold. Use a dryer to reduce its moisture content to the level required for briquettes formation by about half (to about 15%).

Briquetting is a key step in charcoal molding. After the raw materials enter the ball press, they will be subjected to three kinds of forces, namely the main driving force of the briquette machine, the friction force and the centripetal force of the wall.

Due to moisture, adhesives, temperature (about 105 F or 40 C) and pressure of the rollers of the briquetting machine, the charcoal briquettes can maintain their shape when they fall from the bottom of the machine.

After production, bag the charcoal briquettes immediately or stored them in silos. Following the above steps, charcoal briquettes will be produced at a production rate of 2200-20,000 pounds (1-9 metric tons) per hour.

According to the content above, it is not so difficult to process charcoal briquettes. But we need to pay attention to many details, such as component ratio, moisture, all of which will directly affect the final quality.

Therefore, the author recommends that the users need to understand and confirm every step and its details of the charcoal briquettes processing ahead. And then choose the reliable supplier for the purchase of the equipment needed in the processing, such as crusher, dryer, briquette machine, etc.

As a leading mining machinery manufacturer and exporter in China, we are always here to provide you with high quality products and better services. Welcome to contact us through one of the following ways or visit our company and factories.

Based on the high quality and complete after-sales service, our products have been exported to more than 120 countries and regions. Fote Machinery has been the choice of more than 200,000 customers.

4 main factors that will influence the coal briquette quality

4 main factors that will influence the coal briquette quality

Coal fine briquetting system is a briquette system uses the coal fine briquette machine as the core equipement to turn the coal fine to briquette. It includes two types, cold coal briquette and hot coal briquette, and most of the systems are cold briquette systems.

Under certain pressure and proper moisture, the coal fine and binder particles slide into contact with each other, forming electrostatic attraction force, solid bridge bridging force, and liquid bridging particles coupling force and van der Waals force. These forces work together to bond the coal fine particles together to a coal briquette.

Coal fine briquetting conditions include briquette pressure, briquette moisture, binder type and ratio, mixing time and mixing way, material size and composition, curing way and coal briquette drying temperature, etc.

For binder free briquette, finer coal particles are generally used, while coarser particles are suitable for coal fine with higher ash. When there is a binder briquette, particles of different sizes will produce different specific surface areas, which will seriously affect the degree of bonding with the binder particles, which may lead to the loss of the binder in some areas of the briquette.

The higher the coalification degree of coal, the larger the micelle structure of coal, with the increase of the elasticity and hardness of coal, the plasticity is reduced, which will lead to different compressible spaces of coal particles of different coal ranks when briquetting.

Under the briquette pressure, the coal particles of the high rank coal are not easily broken, which we shall be appropriately increased the particle size, while for the low rank coal, the particle size should be appropriately reduced.

The best gradation of coal fine is mainly coarse-grained grade, followed by fine-grained grade, and the middle-grained grade is the smallest. When the coal fine particle size is too concentrated to the upper or lower limit, this will reduce the briquette strength. The composition of any single particle size will reduce the strength of the briquette, so the coal fine grading distribution should be based on different sizes matching.

With the binder free way, increasing of briquette pressure is beneficial to increase the strength of the briquette. For a binder way, when the binder is different, the maximum briquette pressure of the briquette is also different.

Increasing the briquette pressure will compress the coal fine to an extreme value, continue to increase the pressure, the coal fine endurance will exceed the limit and the crushing phenomenon. When the briquette pressure is greater than the limit of the coal fine particles, there will be broken coal splitting phenomena and rebound phenomenon, it will destroy the integrity of the coal particles and cause cracks in the briquette, thereby reducing the strength of the briquette.

The strength of the briquette which first mixes the binder with the coal fine and adds moisture is much greater than the briquette strength of the binder after the first moisture is added. This is because a water film is formed on the surface of the coal particles after preferential moisture distribution, which prevents the binder particles and the coal fine particles from coming into contact with each other.

As the briquette moisture increases, the briquette strength increases first and then decreases. This is because the moisture can bring tiny particles into the infiltrated pores, reduce the porosity and make the coal particles dense and compact, while the excessive water film on the surface of the particles will cause the coal fine to swell and loosen.

For the inorganic binders, the moisture hydration reaction with the combination of the moisturization bonds the pulverized coal to each other. If the moisture is too low, the hydration reaction time will be slowed down and the briquette solidification time will be prolonged.

For organic binders, the moisture acts to lubricate the movement of its molecular groups, promoting the contact of molecular groups with the surface of the coal fine. If the moisture is too high, it will hinder the action of the molecular group, and the excess moisture will overflow during the pressing process and take away some of the binders.

For hydrophilic binders, an appropriate amount of moisturizer not only promotes the movement of coal particles, but also facilitates bonding to each other, but too much moisture will result in poor bonding effect, and suitable moisture is generally between 10% to 15%.

Due to the different binder components and properties, the binder bonding process is different, mainly chemical bonding, cohesive bonding, hydration bonding, adhesion bonding and polycondensation bonding.

Inorganic binder can significantly increase the strength of briquette, but it will increase the briquette ash and the cohesiveness is not high. The organic binder will not increase the briquette ash but the strength sensitivity is high and with poor waterproof performance. The composite binder can make up for the deficiency and shortcomings of the single binder to make the performance of the briquette optimal.

There are two ways in which the same kind of binder affects the strength of briquette: a concentration with a certain quality and a mass with a certain concentration. The optimum concentration of binder has the highest amount of briquette strength, and the influence of different concentrations of binder on briquette strength is also different.

The mixing uniformity is positively correlated with the stirring time. When the stirring time is more than 35 min, the mixing uniformity is the highest and the briquette strength stability is the best.

The influence of briquette additive components on briquette strength varies. For example quick-setting additive will enhance the compressive strength; Phosphate and Fe2O3 hinder the increase in compressive strength.

The hydrothermally treated coal fine, moisture and volatiles were significantly reduced, but the saturated alkanes increased, and the higher the hydrothermal treatment temperature, the greater the compressive strength of the briquette.

The group distribution ratio and production process of cold coal briquette are important means to improve the cold compressive strength of coal briquettes and the adsorption performance of stable coal.

Fully understand the composition, specific gravity and production process of briquette on the strength of cold coal briquette, and on this basis, optimize the production process of the outstanding simulation test briquette.

It is of great significance to make a comparative simulation of similar materials and process research with high physical and mechanical properties and adsorption properties of raw coal and to carry out large-scale outburst simulation experiments using large-size briquette in the future.

value addition of coal fines and sawdust to briquettes using molasses as a binder - sciencedirect

value addition of coal fines and sawdust to briquettes using molasses as a binder - sciencedirect

In this study, the co-briquetting of coal fines saw dust and molasses as a binder is explored as an option for value addition of the wastes generated in the various industries. The effect of the saw dust concentration and the molasses concentration was investigated through measuring the briquette's calorific value, fixed carbon, compressive strength and shatter index. Addition of Ca(OH)2 was done to effect removal of sulphur from the briquette. Measurements of the briquettes physicochemical properties such as moisture content, ash content and sulphur content were measured using the standard methods. As the saw dust and the molasses concentration increased, the calorific value, fixed carbon and compressive strength increased by 16%, 8% and 50% respectively. Whereas, the shatter index decreased by 146% as the saw dust and the molasses concentration increased in relation to the coal fines. Addition of the saw dust and the molasses are therefore critical in the production of a high quality coal-saw dust-molasses briquette which does not shatter.

the influence of composition of coal briquettes on changes in volume of the heated coal charge - sciencedirect

the influence of composition of coal briquettes on changes in volume of the heated coal charge - sciencedirect

Influence of briquettes on changes in volume of the heated coal charge was studied.Briquettes composition influences changes in volume of heated charge.Differences in texture of briquette material were observed in various blends.Composition of volatile products influences gasification of briquettes.

Two coal blends of different composition made of lower, medium, and higher rank coals (further in the text LRC, MRC, and HRC appropriately) in the ratio of 70:20:10 and 20:70:10 were carbonized in a laboratory unit for coke-making with the use of X-raying. The carbonization of the blends was carried out with the briquettes having the same composition as the blend and with the briquettes made of HRC with 2wt% of coal tar pitch (CTP), with 2wt% of low density polyethylene (LDPE), and with 2wt% of polypropylene (PP). Markers were introduced into the charges of the blends to enable measurements on X-ray pictures that are connected with volumetric changes. The same blends were pyrolyzed in thermobalance coupled with a TG/FT-IR interface.

It has been proven experimentally that the addition of briquettes to the coal charge having the same composition as the charge leads to an increase in volume of the charge near the heating wall. The introduction of the briquettes made of higher rank coal with addition of CTP, LDPE, and PP reduces the increase in volume of the two charges at the stage of coal grain swelling.

The briquettes made of the blend of HRC with LDPE are most exposed to gasification by decomposition products from blend 1; the composition of volatiles does not influence the gasification of the briquettes made of the blend of HRC with PP. The briquettes made of the blend of HRC with CTP substantially increase their thickness under the influence of a greater amount of volatile products.

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