Briquettes are a household and institutional fuel, made by compacting biomass waste. Read on for more about this simple technology. Applications Briquettes have a wide variety of use from household to industrial. The fuel has not been fully exploited as there has not been scarcity of fuel in the past. However, with the current fuel shortage and ever rising prices, consumers are looking for affordable alternative fuels and briquettes fill this gap for:
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Excerpted from Developing Energy Enterprises Project East Africa (DEEP EA)Briquettes Production1. Technology BasicsFuel briquettes are blocks of compressed biomass material such as farming waste, charcoal dust or waste paper. The prices of firewood and charcoal have been increasing dramatically, making it less affordable for most users. Briquettes are a proven technology that provides a low cost fuel for households that is locally made and an alternative to wood or charcoal. Fuel briquettes can also be used in institutions for large scale cooking, and in industries for productive use.
Two types of fuel briquettes exist in the market
1. Non-carbonized fuel briquettes. These are produced from waste materials that are not carbonized such as sawdust and waste paper.
2. Carbonized fuel briquettes. These are made from waste materials that have undergone carbonization such as charcoal dust, or carbonizing non-carbonized briquettes.
Benefits
Briquettes can potentially offer the following benefits over traditional biomass fuels (firewood or charcoal):
Uniformity and standardisation;
Could be tailored to the particular usage. i.e. long burning time, stove types (institutional or households), smoke and ash levels among others;
Lower overall fuel costs for users as they are made from biomass waste.
A Briquette
Briquettes are made from raw materials that are compacted into a mould. Briquette could be made of different shapes and sizes depending on the mould. The appearance, burning characteristics of briquettes depends on the type of feedstock and the level of compactness and the mould used.
The size and shape should be designed to match the market (Stove to be used). For household use, a high surface area (compared to its weight) is needed to enhance burning. This helps to make combustion uniform and complete, reducing harmful gases and smoke. This can be achieved by: a) having a hole(s) in briquettes, or b) making small briquettes commonly referred as pellets, say half the size of a mug.
Feedstock
how to made briquettes
Biomass briquettes are made by pressing loose biomass residues or waste, to produce compact solid blocks of different sizes and shapes. They are made by applying pressure, heat and binding agent to the loose material to produce the briquettes of different shapes and sizes. The size and shape ca be designed to match the market needs.
Process options
Carbonised process: In this process the feedstock is first partially burned in an environment where fresh air is controlled. The process is known as charring or carbonisation. Once carbonised, the materials are then compacted using a briquette press. The advantage with carbonised briquettes is that they are virtually smokeless ' a key consideration for household users. Carbonising kilns range from the very simple (a hole in the ground, covered by turf) to more complex and more efficient designs. For example, Figure 4 shows a carbonising kiln from Appropriate Rural Technology Institute (ARTI), India. It is a portable cylindrical structure about 150cm wide with 100 cm tall made out of sheet iron or a used drum:
A very common practice is to make briquettes from charcoal dust that has already undergone carbonisation. Non-carbonised process: This is the process of making briquettes without first carbonising them. The biomass materials are simply prepared and compacted to produce briquettes. This is simpler (and cheaper) process for a micro and small scale enterprises than carbonising ' but only suited to applications where smoke is not an issue. However, for industrial applications, it requires sophisticated machines to attain the level of compactness required.
The choice and availability of feedstock can make or break your business! A common feedstock to use is charcoal dust (particles of charcoal too fine to be sold). But other combustible material can potentially be used too, including: saw dust, bagasse, coffee husks, maize cobs, wheat/beans/barley straws and charcoal dust. For example, Figure 3 shows a mountain of saw dust in readiness for briquettes production! For one to produce quality briquettes, a number of factors need to be taken into considerations such as: moisture content, calorific value of the feedstock, smoke levels and ash content. In most cases (unless a powerful machine is used) a binding agent is added. Clay is common. There is also an added benefit to using clay: it can lower the rate of burning, so less heat is produced but for a longer period.
Briquette machine
Briquette machines range from simple manual press to a fully motorized and complex type. The main thing to consider is how many briquettes you want to produce and this will narrow down the type of briquette machines required. For start-ups, a manual briquette machines might be appropriate, as it may not require too much investment. If you want to start a briquetting business, please feel free to contact us, KMEC would provide you with professional advice and perfect service. All kinds of briquette machine are available here to meet all of your requirements.
Briquettes can be made by hand. Feedstock is mixed with water and a binder, moulded into balls and left to dry. This is an easy way to get your business off the ground and there is no excuse for not giving it a go! However, machines can potentially:1) add value to the product2) increase the amount of briquettes a single person can produce in a day.
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Kingman briquettes making machine and biomass briquette machine will bring you a lucrative biomass briquette and charcoal fuel market. Hereby we can map out the prospect of using briquettes making machine and and biomass briquette machine.
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Biomass is recognized as an efficient and an environmentally friendly alternative to fossil fuels. Densification of biomass is an important element in trading and handling biomass, as densified fuel offers logistical advantages, and becomes a commodity ensuring high energy content and homogenous quality. Within densification, pellets are best known, but briquetting offers many alternative advantages.Traditionally, briquetting technology was established for developing countries to produce briquettes of local residues, for use in household cooking stoves and restaurants. Later, as the capacities of the machines increased,
briquettes were used in industrial boilers to create heat, steam and power for industry and power plants. Within the past 20 years, briquetting has also found its way to households in industrialized countries as consumer logs for wood-burning stoves and fireplaces.
In recent years, as the focus on renewable energy has grown, the applications for briquettes have grown concurrently, as have different technologies and new applications.
Briquetting Technologies
Briquetting technologies include mechanical briquetting presses, hydraulic briquetting presses and screw presses; it is important that customers select the best technology for their applications.
Mechanical
The mechanical briquetting press is built like an eccentric press, and has a very simple design. A constantly rotating eccentric, connected to a piston, presses the raw material
through a conical die system, where the briquettes are being formed. Large flywheels secure a very quiet and balanced operation. The press operates with 270 strokes per minute. The briquettes are cooled and hardened in a cooling line, which also serves as transportation of the briquettes. The presses work fully automatic, resulting in a smooth operation with very little maintenance and service. The robust design ensures a long life span and the presses can operate up to 7,000 to 8,000 hours per year.
C.F. Nielsen has more than 70 years' experience with briquetting machines and, over the years, has developed new equipment and increased capacities, so that the range is now
from 200 kilograms per hour (kg/h) up to 5.000 kg/h per machine. The briquettes can be produced in sizes from a diameter of 50 millimeters (mm) to 120 mm, and in square
form from 55 mm by 55 mm to 100 mm by 100 mm. Other shapes can also be produced.
The main advantage of a mechanical briquetting press is that the press can be used both for consumer logs and industrial briquettes for boilers. Industrial briquettes can either be made as short pucks, at random lengths or cut to a defined length. Further advantages are high capacity, low production costs, and multiple densities.Hydraulic Presses
In a hydraulic press, the raw material is pressed into a precompression chamber by a dosing screw. In the chamber, the exact amount of material is precompressed. The main piston transfers the raw material into the die that forms the briquette into its final state and required density.
The compressionprocess of a hydraulic press is relatively slow. The compression cycle can be between six and 25 cycles per minute, depending on the amount loaded or the density of the briquettes. Hydraulic briquetting
presses were traditionally small, with capacities from 50 kg/h up to 200 kg/h. Briquettes were round, with a diameter of 50 mm to 75 mm.
However, today, hydraulic briquettes can be made in primarily rectangular forms with a capacity up to 1.5 tons per hour. The traditional size is 150 by 60 mm, but bigger briquettes can be made.
C.F. Nielsen's BPH-Quattro briquetting press, a hydraulic press has a capacity of up to 600 kg/h. The briquetting press is a self-contained unit, with a small dosing bin, PLC control panel and the briquetting press. The press can produce briquettes with a high density due to a large main motor and cylinder. The rectangular briquette is a uniformsized briquette that is easy to store. The briquettes have a lower density slightly below 1, which gives a shorter burn. The press can produce good briquettes from mixed materials of larger particles, and is very compact. The briquettes are typically used as consumer briquettes for fireplaces and wood-burning stoves.
Please note that this hydraulic briquetting machine is no longer offered by C.F. Nielsen. We refer to our new sister company RUF Briquetting Systems.
Screw presses
In an extruder briquetting press, the raw material is fed into a chamber by a feeding screw. The raw material is compressed by a compression screw into the conical die and extension die. The compression screws are conical in shape. The screw operates with approximately 800 revolutions per minute, and during the process high heat'up to 300 degrees Celsius' is being generated in a combination of friction and heating of the die system.
The BP Shimada Screw Press has capacities up to 500 kg/h. The press is a self-contained unit with a small bin, PLC control panel, smoke hood and saw. The screw press is a machine for high-quality briquettes with a very high density. The machine is a more delicate press, requiring very homogenous raw material with very fine particles (between 2 and 6 mm) and the moisture content between 6 and 8 percent. If these requirements are met, the machine will produce state-of-the-art briquettes that will burn longer than all other alternatives. The briquettes are typically used as consumer briquettes or logs for fireplaces and wood-burning stoves.
Today, briquetting is obtaining renewed attention. A briquetting machine is more simple and easier to operate, which opens new possibilities in new markets such as Africa, Asia and Latin America. Furthermore, briquetting presses can handle a larger range of raw material such larger particles, waste with higher ash content and special raw materials. Some examples of these applications include the following.
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