2T/H Biomass Wood Straw Pellet Plant in Bulgaria

Product plan

This biomass wood straw pellet plant in Bulgaria project is expected to use straw or sawdust to produce 8,000 tons of biomass pellets and 2,000 tons of biomass block products annually. The finished products made of straw can be used as both fuel and feed; the finished products made of sawdust can only be used as fuel.

According to market demand, the products are divided into pellets and blocks. The length of the pellets is 4-12mm, and the packaging specification of the finished product is 25kg/bag; the block size is 32*32mm, which is packaged according to customer needs.

Product plan and production scale of this project

Consumption of main raw and auxiliary materials

The consumption of raw and auxiliary materials for the biomass wood straw pellet plant in Bulgaria project is shown in the table below.

The raw materials of this biomass wood straw pellet plant in Bulgaria project are mainly wheat straw, corn straw and soybean straw. Before the straw is purchased, a special person will pack and bundle it in the fields. It is only necessary to send a transport vehicle to transport the straw back to the raw material warehouse in the factory for storage.

During production, a water meter is used to measure the moisture content. If the moisture content is >25%, a dryer is used for drying, otherwise it is directly used for production. In addition, since the straw is in a loose and naturally formed state, the bulk density is low and the transportation cost is relatively high, it is only suitable for local materials, thereby effectively reducing production costs.

Biomass pellet fuel performance index requirements

Feed (raw material) hygiene indicators

When straw is used as the main raw material for processing feed pellets, the following hygiene indicators must be met:

Construction content and scale

The total construction area of this biomass wood straw pellet plant in Bulgaria project is 5550m2. The existing northwest corner factory building is used as a warehouse, covering an area of 500m2; the existing three factory buildings are used as finished product warehouses, covering a total area of 2000m2; the existing office area is used as the office and living area of this project, covering an area of 200m2.

The existing factory buildings are used as maintenance workshops and hazardous waste rooms, covering a total area of 100 m2; a new crushing workshop is built with an area of 240m2; a new production workshop is built with an area of 510m2; 5 new raw material warehouses are built using the existing vacant land in the factory area, covering a total area of 5000 m2.

Purchase 1 chipper, 3 crushers, 1 drum screen, 1 straw dryer, 2 straw pellet machine, 1 briquetting machine, 1 cooler, and 1 packaging scale, and improve the water, electricity, road and hardening facilities in the factory area, and purchase environmental protection and supporting equipment to form an annual production line of 8,000 tons of biomass pellet products and 2,000 tons of biomass block products.

The project composition and main equipment list are shown in the following tables.

Maintenance workshop: Automobiles, production equipment, etc. need regular maintenance. In addition, failures are inevitable during long-term use. Therefore, the maintenance workshop is mainly used to store tools for maintenance and repair of machines, such as engine oil, screws, ring molds, and arches. A small amount of engine oil may leak on the ground during maintenance, so the workshop floor needs to be treated with anti-corrosion and anti-seepage, and the waste engine oil is temporarily stored in the hazardous waste room and regularly handed over to qualified units for treatment. List of main straw pellet processing equipment The main equipment purchased from RICHI MACHINERY for this biomass wood straw pellet plant in Bulgaria project is shown in the following table:

Capacity matching analysis

Since the equipment model and quantity are closely related to the biomass wood straw pellet plant in Bulgaria project's capacity, this environmental assessment calculates the capacity matching based on the unit capacity and production time of the enterprise's supporting production equipment.

The chipper, drum screen, and dryer are used when the raw materials do not meet the production requirements, and the use time is short, so they are not considered. See the table below for details.

It can be seen from the above table that when the crusher is running at full load, it can crush 38,400t/a of raw materials, and the pellet machine and briquetting machine can produce 31,200t/a at full load. This project is expected to produce 8,000 tons of biomass pellet products and 2,000 tons of biomass block products annually, which can meet the demand.

Project layout

According to local natural conditions, the general layout is based on reasonable processes, compact layout, land saving, and full use of existing resources in the factory area to meet fire prevention, sanitation, explosion prevention and other requirements, so that it is conducive to production and convenient management.

At the same time, attention is paid to the integrity of the overall layout of the whole biomass pellet factory, so that the building group is unified and coordinated.

This biomass wood straw pellet plant in Bulgaria project has two factory gates, located on the south and east sides of the factory area. The office and living area uses the existing office area, which is located in the southeast of the factory area, and the production workshop is located in the southwest of the factory area.

The finished product warehouse uses the existing factory building, and the raw material warehouse is newly built on the vacant land in the factory area.

Economic and technical indicators

The main economic and technical indicators of this biomass wood straw pellet plant in Bulgaria project are shown in the table below.

Biomass straw wood pellet making Process design

When straw is used as raw material for this biomass wood straw pellet plant in Bulgaria project:

1. Raw material stacking:
   Before the straw required for this project is purchased, it has been packaged and bundled in the fields by a dedicated person. The company only needs to send a transport vehicle to transport the straw back to the raw material warehouse in the factory area for stacking and storage.
   When processing is required, the straw is pulled to the feed port of the crusher. The raw material warehouse is a closed steel structure workshop, and the ground needs to be hardened.
2. Crushing:
   The raw material is sent to the crusher feed port of the crushing workshop by a forklift. The crusher is placed in a closed workshop. A gas collection hood is installed above the crusher. The dust is treated by a bag dust collector and then discharged through a 20m exhaust pipe (No. 1). The length of the crushed raw material is 5-6mm.
3. Drying:
   Before crushing, a water meter is used to detect the moisture content of the raw material. The raw material can be directly crushed for production if the moisture content is below 25%. Otherwise, the crushed raw material is conveyed to the dryer through a closed belt for drying.
   Drying principle: The hot air flow moves forward from the tail, fully contacts the material, and fully utilizes the heat transfer through heat conduction, convection, and radiation; the heat energy is directly transferred to the material, so that the moisture of the material is continuously evaporated inside the cylinder, and the draft device at the inlet draws out a large amount of water and wet air flow to prevent dust discharge and secondary pollution; the material movement is promoted through internal spiral stirring, sweeping, and lifting plates to complete the entire drying process; countercurrent conduction dehumidification avoids reducing repeated drying procedures.
4. Granulation/briquetting:
   The crushed raw materials are transported into the inlet of the biomass straw pellet machine/briquetting machine through a closed belt, and extruded into finished products. The extrusion process is a physical process, without adding any adhesive, and no chemical reaction occurs. The granulation process is fully closed.
5. Cooling and screening:
   The temperature of the pellets coming out of the biomass pellet mill machine can reach about 70°C, the structure is relatively loose, and it is easy to break. It needs to be cooled by a cooler to meet the safe storage and transportation requirements, otherwise it will become moldy. After cooling, the temperature of the pellets drops to 5-10°C.
   The pellets enter the cooling bin via a high-angle conveyor. The cooled pellets are screened by a vibrating screen under the cooler to screen out unqualified particles to ensure the quality of the pellets before leaving the factory. The screened defective products are reused in production and then crushed for re-granulation.
6. Packaging:
   The screened finished biomass pellets are packed on a packaging scale and stored for sale.

When wood blocks are used as raw materials in this biomass wood straw pellet plant in Bulgaria project:

1. Raw material stacking: The purchased waste wood blocks are stacked in the No. 4 raw material warehouse for use as raw materials. The raw material warehouse is a closed steel structure workshop with a hardened floor.
2. Chipping: The wood blocks are sent to the chipper inlet by a forklift for chipping, and then sent to the crusher by a closed belt conveyor for crushing. A gas collection hood is installed above the chipper and crusher. The dust is treated by a bag dust collector and then discharged through a 15m exhaust pipe.
3. Crushing: The raw materials are sent to the crusher inlet of the No. 4 raw material warehouse by a forklift. The crushed raw materials are 5-6mm long. The crusher is placed in a closed workshop, with an integrated hood above the crusher. The dust is treated by a bag filter and then discharged through a 15m exhaust pipe.
4. Drying, pelletizing/briquetting, cooling, screening, and packaging: The production process is the same as when corn stalks are used as raw materials.

When wood chips are used as raw materials for this biomass wood straw pellet plant in Bulgaria project:

1. Raw material stacking: The purchased wood chips are stacked in the raw material warehouse for use as raw materials. When processing is required, a forklift is used to transport the wood chips to the drum screen inlet. The raw material warehouse is a closed steel structure workshop, and the floor needs to be hardened.
2. Roller screen: The directly purchased wood chips contain impurities such as iron chips, which must first be removed by a drum screen. The screened iron chips are collected and sold outside. The drum screen is placed in a closed crushing workshop, with an integrated hood above the drum screen. The dust is treated by a bag filter and then discharged through a 20m exhaust pipe .
3. Drying, pelletizing/briquetting, cooling and screening, packaging: the same production process as when stalks are used as raw materials.

Five necessary conditions for building a biomass pellet production line in Bulgaria

With the arrival of the peak season of the biomass pellet market, many customers have begun to consult about biomass pellet equipment. The two questions they ask more frequently are: 1. What are the prerequisites for building a biomass pellet production line? 2. How much does a pellet production line cost?

Follow me and take a look at the five necessary conditions for building a biomass wood straw pellet plant in Bulgaria.

• The most important thing is to have raw materials. For example, if there is a furniture factory nearby, you can use sawdust to make pellets. If there are many fields around, you can use straw and various straws. If there are many woodlands around, you can use branches, trunks, etc. Including but not limited to these raw materials, in short, it is to use the local biomass resources.
• Factory site selection is the key! The factory site should preferably be close to the raw material production area, which can save costs. As for the question of how large the factory area and how large the capacity of the transformer are, it is determined by the specific output and auxiliary equipment required by the customer.
• Choose wood pellet machines and straw pellet machines with stable quality. High output, low failure rate, easy operation, etc. Ensure stable equipment operation while ensuring output.
• Certain funds. Equipment investment ranges from tens of thousands to millions of US dollars, which is matched according to the specific situation of raw materials. Different raw materials require different auxiliary equipment such as crushers, grinders, dryers, etc., and the investment size is also different. Therefore, it is necessary to first understand the specific situation of the raw materials before choosing the right machinery and equipment.
• The problem of pellet sales. Pellets need to be digested locally as much as possible. Long-distance transportation will increase costs. The market price of one ton of biomass pellets is between 100 and 300 US dollars. Considering the freight and raw material processing costs, the profit margin must be controlled well.

Finally, to summarize: you should first investigate the raw materials before consulting the biomass straw wood pellet mill equipment. All equipment serves the raw materials. If you are interested in building a biomass straw pellet production line in Bulgaria, feel free to contact us to customize the process plan and get a full set of equipment quotes and solutions!