2-3T/H Straw Pellet Production Line In Thailand

Thailand energy company and BLF pellet machine work together again. The order is for the production line of straw pellet machine, including: straw pellet machine, crusher, crushing equipment, dryer, cooling machine, packaging equipment and other supporting equipment.

In order to expand production capacity and increase market share, Thailand Energy Company customized a 2-3T/H straw pellet production line. Since our biomass pellet production line is running well, the Thai customer decided to cooperate with us for the second time.

Our straw granulator equipment production line, the straw granules produced can be used as fuel, and can also be further processed as biomass fertilizer.

As a national high-tech enterprise, the straw granulator developed and produced by us has the characteristics of stable operation, low consumption and high energy, environmental protection and energy saving, and high molding rate.

Straw

Straw is the general term for the stems and leaves (ears) of mature crops. Usually refers to the remaining part of wheat, rice, corn, potato, rapeseed, cotton, sugar cane and other crops (usually coarse grains) after the seeds are harvested. More than half of the photosynthetic products of crops exist in straw, which is rich in nitrogen, phosphorus, potassium, calcium, magnesium and organic matter, etc. It is a multi-purpose renewable biological resource, and straw is also a roughage. It is characterized by high crude fiber content (30%-40%), and contains lignin and so on. Although lignocellulose cannot be utilized by pigs and chickens, it can be absorbed and utilized by ruminant cattle, sheep and other livestock.

The application of straw in the world

In the United States, there are 24 agricultural states that can collect about 45 million tons of straw every year, which are used as feed, or used to build houses, and the whole bundle of straw is squeezed with high strength to fill the walls of new houses; in addition, the United States is also actively promoting In the renewable energy business, straw is used as an emerging alternative fuel, especially biofuel.

In Europe, a new way of straw power generation has been created.

In Japan, people mainly turn the straw into the soil and return it to the field as fertilizer, and also use the straw as roughage to feed livestock.

In 2017, the total theoretical resources of straw in China reached 1.02 billion tons, an increase of nearly 400 million tons compared with the early 1990s. Among them, the amount of corn, rice, and wheat straw was 430, 240, and 180 million tons, respectively, and the three major crops accounted for 83.3% of the straw. The amount of collectable straw resources in China is 840 million tons, and the utilized amount has reached about 700 million tons. The comprehensive utilization rate of straw (the ratio of the used amount to the collected amount) exceeds 83%. The utilization rates of fuel, base material, and raw material are 47.3%, 19.4%, 12.7%, 1.9%, and 2.3% respectively, and a comprehensive utilization pattern based on fertilizer, feed, and other agricultural uses has been formed.

The main characteristics of straw:

Generally speaking, straw is composed of 80-90% cells and 10-20% lumen, and the internal material is composed of 5-10% silica and 5-15% extract, most of which are water-soluble . Molecularly, straw cell walls are like wood cell walls, consisting of cellulose, hemicellulose, and lignin. Cellulose aggregates in fibrils surrounded by molecules. Lignin is the “glue” that connects individual cells to form plant tissue and fibrils to form cell walls. Straw differs from wood in the content of cellulose, hemicellulose and lignin. Straw has low cellulose and lignin content, but high hemicellulose content.

Due to their wood-like composition, straw can be used to make straw pulp or converted into straw pellets. According to the particularity of straw, the granulation process of straw can be summarized as follows:

1. Raw material preparation stage:

Straw generally has a high dust potential, which is influenced by the method of harvesting. Therefore, the straw needs to be screened out from the pollutants, such as dust and other foreign objects that may affect the quality of the straw pellets, such as stones, metals, and those that may damage the pellet mill during the following procedures.

2. Crushing stage:

The straw biomass is a tubular material with a diameter of 4-8 mm and a wall thickness of about 0.3-0.6 mm. With the tubular/tubular structure, the straw can be easily processed and obtained to the desired particle size. Generally, the grinding of straw includes cutting and crushing of straw. 3. Drying stage: Usually, the straw is transported in the form of air-dried bags with a moisture content of about 15%, which is suitable for the production of straw granules. Therefore, the drying process of the straw pellets is omitted. But if the stalk has a high moisture content, the drying step is necessary.

3. Modulation

Straw needs special conditioning to achieve the ideal hardness. Straw conditioning involves the application of steam (and/or water) and the addition of binders or additives. Conditioning is required to achieve the necessary temperature and humidity for malleability and to melt the lignin to act as a binder. Binders are needed to enhance the hardness of the granules and reduce abrasion during granulation.

4. Granulation

During the granulation process, it is necessary to consider the influence of material moisture, density, particle size, fiber strength, natural adhesive and other factors on the granulation quality.

Common problems in the pelletizing process of straw pellets are clogged and broken pellet molds, overheating, high energy costs or poor pellet quality, and high pellet mill maintenance. In order to avoid the above problems, a high-quality granulator is required.

5. Cooling and screenin

The freshly extruded straw particles are hot and soft, and need to be cooled to obtain the ideal hardness. At the same time, the sieve on the cooling machine is used to screen out the particles whose molding effect is not up to standard.

6. Finished product packaging

The cooled granules need to be sent to the finished granule bin through a professional skirt belt conveyor, and then unloaded from the finished granule bin, and packed with a packaging scale.

Application range of straw pellets:

Straw pellets are widely used in daily life. Typically, straw pellets are used as animal bedding, animal feed, and as heating fuel for domestic and industrial use.

Now straw pellet technology is widely used and straw pellet machines are sold all over the world, which makes straw pellets popular in heat and power production.

The production process of straw pellets:

Straw solidification molding technology uses agricultural waste such as rice straw, wheat straw, and corn straw as raw materials, and is compressed into a solid biomass fuel that can be directly burned through special equipment such as straw pellet machine through crushing and compression processes.

1. Cut or pulverize the straw to be pressed with the rotary cutting and pulverizing machine, and control its length below 30mm.

2. The crushed straw is sent to the drum dryer through the conveyor, and the moisture content is controlled within the range of 10-15%.

3. The raw materials after drying are piled up and stored after unloading sacron, or stored in a silo. Silo

4. The material is sent to the feed port of the biomass pellet machine through the feeding conveyor. The machine rotates through the main shaft to drive the pressure roller to rotate, and through the rotation of the pressure roller, the material is forced to be extruded from the mold hole into a block, and from the exit The material mouth falls.

5. Then it is sent to the pellet cooler by a special conveyor.

6. After the granules are cooled, send the granules to the packaging scale or ton packing machine for bagging and packaging.

The solidified biomass pellet fuel has a large specificity and small volume, which is convenient for storage and transportation. It is a high-quality solid fuel with a calorific value of 3200-4500 kcal. It has the characteristics of flammability, less ash content, and low cost. It can replace firewood , Raw coal and other fuels are widely used in heating, domestic stoves, industrial boilers, biomass power plants, etc.

As a new commercial energy source, straw pellet fuel has been widely used in various industries. And because of its high density, high calorific value, regular shape, and good fluidity, it is very convenient to realize automatic combustion control, which can save a large amount of energy costs for enterprises.

Precautions for pellet processing:

1. Operators should carefully read the instruction manual and be familiar with the various technological processes of the equipment before using the machine.

2. During the production process, it is necessary to operate strictly in accordance with the regulations and sequence, and perform installation operations according to its requirements.

3. The host equipment needs to be installed and fixed on the horizontal concrete floor, and the screws should be tightened.

4. Smoking and open flames are strictly prohibited in the production site.

5. After each start-up, it needs to idle for a few minutes first, and confirm that the pressure roller fits the mold and rotates before feeding.

6. It is strictly forbidden to add hard debris such as stones and metals to the feeding device, and remove iron before granulation to avoid damage to the granulation chamber.

7. During the operation of the equipment, it is strictly forbidden to use hands or other tools to remove materials to avoid danger.

8. If there is abnormal noise during the production process, the power supply must be cut off immediately, and the machine can be started to continue production after checking and handling the abnormal situation.

9. Before shutting down, first stop the auxiliary feeding, and then put in the oil, and wait until the mold hole is filled with oil and the granulation chamber is empty of oil before shutting down. The purpose of feeding oil is to make it easier to discharge during the next production.

Correctly operate the pellet machine as required, and pay attention to relevant matters as required, not only can improve the output and operating performance of the equipment, but also prolong the service life of the equipment.