The palm oil industry is one of the largest agricultural industries in tropical regions. Countries such as Indonesia, Malaysia, Thailand, Nigeria and Colombia produce millions of tons of palm oil every year, generating a significant amount of biomass residues during processing.
Palm Kernel Shell (PKS) is one of the major by-products produced after palm kernel extraction. Traditionally, some PKS was treated as waste or disposed of through open storage and burning. However, with increasing energy costs and the demand for renewable energy solutions, PKS has become a valuable biomass fuel for industrial boilers.
A PKS biomass boiler uses palm kernel shell as a renewable fuel source to produce steam or thermal energy for industrial processes. For palm oil mills, this provides an opportunity to utilize their own by-products instead of purchasing large amounts of fossil fuels such as coal, diesel or natural gas.
Compared with many agricultural residues, PKS has favorable fuel characteristics. Studies have shown that PKS generally has a higher energy density than many other oil palm biomass materials because of its relatively low ash content and high carbon content. Reported calorific values of PKS commonly fall in the range of about 16–21 MJ/kg depending on moisture condition and testing method.
For palm oil mills, a palm kernel shell boiler can support several applications, including:
As industries continue to focus on sustainable energy and carbon reduction, biomass steam boilers using PKS fuel are becoming an important solution for palm oil mills and other industrial users.
Palm Kernel Shell (PKS) is the hard outer shell of palm seeds that remains after the palm kernel is separated during palm oil processing.
During palm oil production, fresh fruit bunches (FFB) go through several stages:
Palm fruit processing
↓
Palm kernel separation
↓
Kernel crushing and oil extraction
↓
Palm Kernel Shell (PKS) generation
After the kernel is removed for palm kernel oil production, the remaining shell material becomes PKS.
Because PKS is generated directly inside palm oil mills, it is available close to the point of energy consumption. This makes it different from many other biomass fuels that require long-distance transportation.
Typical fuel characteristics of PKS include:
|
Parameter |
Typical Characteristics |
|
Calorific Value |
Approximately 16–21 MJ/kg depending on moisture and test conditions |
|
Moisture Content |
Usually around 10–15% for properly stored material |
|
Ash Content |
Generally low compared with many agricultural residues |
|
Sulfur Content |
Very low |
|
Availability |
High in palm oil producing regions |
Research on PKS fuel properties has reported moisture contents around 12%, ash contents around 3%, and calorific values above 20 MJ/kg under certain test conditions. Actual values vary depending on processing conditions, storage environment and sampling methods.
The main PKS producing regions are located in:
Among these countries, Indonesia and Malaysia have particularly large palm oil industries and generate substantial amounts of palm biomass residues.
Instead of considering PKS as an agricultural waste, many palm oil producers now view it as an energy resource that can reduce operating costs and improve resource utilization.
A biomass boiler requires fuel with stable combustion characteristics, reasonable energy content and reliable availability. PKS meets many of these requirements, which is why it has become a common biomass fuel in industrial applications.
One important advantage of PKS is its relatively high heating value.
Compared with many loose agricultural residues, PKS has a dense structure and contains a higher proportion of fixed carbon. This allows it to release more energy during combustion.
A higher heating value means:
For industrial users, fuel density is important because it affects the entire system, including fuel handling equipment, storage size and boiler operating costs.
The higher energy content of PKS compared with other oil palm residues has been reported in several biomass fuel studies. PKS generally performs better than materials such as empty fruit bunches (EFB) because of its lower moisture and ash characteristics.
One of the biggest advantages of using PKS is its location.
Palm kernel shell is produced inside or near palm oil mills, meaning the fuel source is often available within the same industrial area where the boiler is installed.
This provides several benefits:
Many palm oil mills already use palm biomass, including PKS and fiber, as part of their internal energy systems. The Malaysian Palm Oil Board has documented the use of palm biomass fuel mixtures in palm oil mill operations for steam and power generation.
For a palm oil mill, converting PKS into boiler fuel creates a closed-loop energy system:
Palm fruit → Palm oil production → PKS by-product → Biomass boiler → Steam and power → Palm oil production
This circular approach reduces waste while creating additional value from existing resources.
Many industries are looking for alternatives to coal, diesel and natural gas due to fuel price fluctuations and environmental requirements.
PKS biomass fuel provides a renewable option because it comes from agricultural production rather than fossil resources.
Using a PKS biomass boiler can help industries:
For palm oil mills, this advantage is particularly important because the fuel is generated as part of the production process itself.
Instead of purchasing external fuel, mills can transform their own biomass residue into useful energy.
A PKS biomass boiler converts the chemical energy stored in palm kernel shell into heat energy through combustion.
The complete system usually includes fuel storage, feeding equipment, combustion chamber, heat transfer surfaces, steam generation equipment and emission control systems.
A typical PKS biomass boiler process is:
PKS Storage
↓
Fuel Feeding System
↓
Combustion Chamber
↓
Heat Transfer Section
↓
Steam Generation
↓
Industrial Production Process
Before entering the boiler, PKS is stored in a fuel storage area or silo.
Because PKS particles have irregular shapes and different sizes, proper storage and feeding design are important.
Common equipment includes:
Good storage management helps prevent problems caused by moisture absorption and fuel quality changes.
The feeding system delivers PKS from storage into the boiler furnace at a controlled rate.
A stable feeding system is important because uneven fuel supply may cause:
For industrial PKS boilers, automatic feeding systems are commonly used to maintain continuous operation.
Inside the furnace, PKS burns with controlled air supply.
The boiler design must consider PKS characteristics, including:
Different furnace designs, such as moving grate systems and fluidized bed systems, are selected depending on boiler capacity, fuel quality and operating requirements.
The heat released from PKS combustion is transferred through boiler heating surfaces to produce steam.
The generated steam can then be used for:
A properly designed biomass steam boiler allows industries to convert locally available PKS into reliable process energy.
Selecting the right boiler design is one of the most important decisions when using Palm Kernel Shell as fuel.
Although PKS has good combustion characteristics, its physical properties are different from traditional fuels such as coal or wood chips. PKS particles are relatively lightweight, irregular in shape and may vary in size depending on processing conditions.
Therefore, the boiler furnace, fuel feeding system and ash handling design must match the characteristics of PKS.
For industrial applications, the following biomass boiler technologies are commonly considered:
The final selection depends on factors such as:
Moving grate biomass boilers are widely used for industrial biomass combustion because of their strong fuel adaptability.
In this system, PKS is fed onto a moving grate where combustion takes place while the grate continuously moves the fuel through different combustion zones.
This design allows:
For large palm oil mills, moving grate boilers are a practical choice because they can handle different biomass mixtures, including:
A well-designed moving grate furnace can maintain stable combustion even when PKS moisture content changes slightly due to storage conditions.
For palm oil mill applications, this type of boiler is often selected when reliability and long operating hours are important.
Fluidized bed technology is another suitable option for PKS combustion, especially for projects requiring high fuel flexibility.
In a fluidized bed boiler, air is introduced from the bottom of the furnace at a controlled velocity. The air flow suspends fuel particles and bed materials, creating intensive mixing during combustion.
This combustion method provides:
Fluidized bed boilers are commonly used in larger biomass power generation projects where fuel flexibility is a major consideration.
However, the system usually requires more sophisticated operation control and a higher level of technical management compared with simpler grate systems.
Fixed grate boilers are a traditional biomass combustion technology.
They have a simpler structure and lower initial investment compared with moving grate or fluidized bed systems.
However, for large-scale PKS applications, fixed grate systems have some limitations:
They are generally more suitable for:
For large palm oil mills requiring continuous steam supply, moving grate or fluidized bed technology is usually preferred.
|
Boiler Type |
PKS Suitability |
Main Advantages |
Typical Application |
|
Moving Grate Boiler |
Excellent |
Reliable operation, good fuel adaptability, easy ash discharge |
Palm oil mills, industrial steam production |
|
Fluidized Bed Boiler |
Excellent |
High combustion flexibility, good mixing performance |
Large biomass power plants |
|
Fixed Grate Boiler |
Moderate |
Simple structure, lower investment |
Small capacity applications |
A PKS biomass boiler is not limited to palm oil mills. Due to its renewable fuel characteristics, it can also be applied in various industries that require continuous thermal energy.
The palm oil industry is the largest application area for PKS biomass boilers.
During palm oil production, large quantities of biomass residues are generated, including:
Among these materials, PKS is considered a valuable boiler fuel because of its relatively high energy content and availability.
A PKS boiler for palm oil mill is mainly used for:
Palm oil processing requires a continuous supply of steam for equipment such as sterilizers and processing units.
A biomass steam boiler using PKS can provide the required thermal energy while reducing dependence on purchased fuels.
Some palm oil mills use biomass boilers together with steam turbines to generate electricity.
This allows mills to:
Using PKS as boiler fuel transforms a by-product into an energy resource.
This helps mills reduce biomass disposal problems and improve overall resource utilization.
Many food processing factories require large amounts of steam for production processes.
Examples include:
For factories located near palm-producing regions, PKS can become a competitive biomass fuel option.
A biomass steam boiler fueled by PKS can provide:
Compared with purchasing fossil fuels, locally available biomass can provide a more stable fuel supply strategy.
The textile industry is another important steam consumer.
Processes such as:
require continuous heat energy.
In regions where PKS is available, textile factories can consider biomass boilers as an alternative energy solution.
A properly designed PKS biomass boiler can provide stable steam output for textile production while helping factories reduce their dependence on coal or oil-based fuels.
PKS is also used in biomass power plants.
Because of its relatively high energy content and availability in palm oil-producing countries, PKS has become an international biomass fuel commodity.
Large-scale biomass power projects may use PKS alone or mix it with other biomass fuels to achieve stable operation.
Applications include:
Using PKS as boiler fuel provides both economic and environmental advantages, especially for industries located close to palm oil production areas.
Fuel cost is one of the most important considerations for industrial boiler users.
Since PKS is generated as a by-product of palm oil processing, many palm oil mills already have access to this fuel source.
Compared with imported fossil fuels, locally available PKS can reduce fuel purchasing requirements.
The actual cost advantage depends on:
Large-scale agricultural industries generate significant amounts of biomass residues.
Without proper utilization, these residues may require additional handling and storage.
A PKS biomass boiler provides a practical solution by converting waste material into useful energy.
The process creates a circular energy model:
Agricultural production
→ Biomass residue
→ Boiler fuel
→ Steam and electricity
→ Industrial production
PKS is derived from palm trees, making it a renewable biomass resource.
Unlike coal and petroleum-based fuels, biomass can be continuously generated through agricultural production.
For companies with sustainability targets, PKS biomass boilers provide a way to increase renewable energy usage within industrial operations.
Fuel supply stability is important for industries operating continuous production lines.
Palm oil-producing countries have established PKS supply chains because the material is generated regularly from palm processing facilities.
This makes PKS different from some seasonal biomass fuels that may experience significant supply fluctuations.
Replacing part of fossil fuel consumption with biomass can help industries reduce their reliance on conventional energy sources.
The actual carbon reduction depends on:
For companies implementing sustainability programs, biomass boilers are often considered part of their long-term energy transition strategy.
Although PKS has many advantages, successful operation requires proper boiler design and fuel management.
Ignoring fuel characteristics may lead to problems such as unstable combustion, ash deposition and reduced boiler performance.
The moisture content of PKS can change depending on:
Higher moisture content reduces the available energy from the fuel because part of the combustion heat is used to evaporate water.
Possible impacts include:
Solutions include:
Ash behavior is an important consideration in biomass boiler operation.
PKS ash contains minerals such as potassium and silica, which may contribute to ash deposits under unsuitable combustion conditions.
Problems caused by slagging and fouling include:
To address these issues, boiler design should consider:
PKS has different physical properties compared with coal.
It is:
Therefore, the fuel handling system requires careful design.
Common equipment includes:
A reliable fuel feeding system is essential for maintaining stable boiler operation.
Palm Kernel Shell is one of the most commonly used biomass fuels in palm-producing countries, but it is not the only available option.
Depending on regional resources, industries may also use rice husk, wood chips, bagasse and other agricultural residues.
The selection of biomass fuel depends on several factors:
A boiler designed for one biomass fuel may not always perform well with another fuel. Therefore, fuel characteristics should be evaluated before selecting a biomass boiler system.
Rice husk is another widely available agricultural biomass fuel, especially in rice-producing countries.
Compared with rice husk, PKS generally has a higher energy density and lower ash content.
|
Fuel |
Advantages |
Challenges |
|
PKS |
Higher calorific value, lower ash content, good storage characteristics |
Requires proper ash and combustion control |
|
Rice Husk |
Widely available, low-cost in rice-growing regions |
Higher ash content, silica-related ash problems |
Rice husk ash typically contains a high proportion of silica. According to biomass fuel studies, rice husk ash content can be significantly higher than PKS, which may increase ash handling requirements.
For industries located near palm oil mills, PKS is often a more suitable fuel option for medium and large industrial boilers.
Wood chips are commonly used in biomass boilers because they provide stable combustion characteristics.
However, wood fuel supply and cost can vary significantly depending on local forestry resources.
|
Fuel |
Advantages |
Challenges |
|
PKS |
Available as palm processing by-product, high energy density |
Requires suitable feeding design |
|
Wood Chips |
Stable combustion, widely accepted fuel |
Higher processing and transportation costs in some regions |
For industries near palm plantations, PKS may provide a more economical alternative because the fuel source is already available locally.
Bagasse is the fibrous residue generated from sugarcane processing.
Sugar mills commonly use bagasse as an internal boiler fuel.
|
Fuel |
Advantages |
Challenges |
|
PKS |
More stable storage, higher energy density |
Needs dedicated fuel handling system |
|
Bagasse |
Available directly from sugar mills |
Seasonal availability, higher moisture content |
The choice between PKS and bagasse depends mainly on the industry location and available agricultural resources.
Selecting a biomass boiler supplier is not only about choosing boiler capacity and price.
For PKS applications, the manufacturer needs to understand fuel characteristics and provide a complete energy solution.
A suitable supplier should have experience in:
The following factors should be considered before making a decision.
Different PKS sources may have different characteristics.
Factors such as moisture content, ash composition and particle size can affect boiler performance.
A professional biomass boiler manufacturer should be able to analyze:
Based on fuel analysis, the supplier can recommend:
A boiler designed according to actual fuel conditions usually provides more stable operation than a standard design without fuel evaluation.
Industrial biomass boiler projects involve more than the boiler itself.
A complete PKS biomass boiler project may include:
Therefore, experience in EPC project execution is an important factor.
A supplier with engineering capability can help customers coordinate the complete system rather than only supplying individual equipment.
Environmental requirements are becoming increasingly important for industrial boiler projects.
Biomass combustion produces flue gas containing particulate matter and ash particles.
A PKS biomass boiler system usually requires appropriate dust removal equipment, such as:
A cyclone separator removes larger dust particles from flue gas through centrifugal force.
It is commonly used as a first-stage dust removal device.
A bag filter provides finer particulate removal and helps meet stricter emission requirements.
Proper ash collection and discharge equipment helps maintain stable boiler operation.
The emission system should be designed according to:
A biomass boiler is a long-term industrial investment.
After installation, customers may need support related to:
A reliable manufacturer should provide technical documents, operation manuals and remote assistance.
For overseas projects, international service capability is especially important because response time and technical communication can affect production continuity.
Yes. Palm Kernel Shell (PKS) can be used as biomass boiler fuel and is widely applied in palm oil-producing countries.
PKS has suitable combustion characteristics, including relatively high calorific value and low ash content compared with many agricultural residues.
It can be used for steam generation, industrial heating and biomass power generation.
PKS biomass boilers are mainly used in industries that require continuous thermal energy.
Common applications include:
Among these applications, palm oil mills are the most common because PKS is generated directly during palm kernel processing.
PKS and coal have different characteristics.
Coal generally has higher energy density and established supply chains, but it is a fossil fuel.
PKS provides advantages such as:
However, biomass boiler performance depends on proper furnace design, fuel preparation and operation management.
The best choice depends on fuel availability, energy requirements and local conditions.
Moving grate biomass boilers and fluidized bed biomass boilers are commonly used for PKS fuel.
For large industrial applications, moving grate systems are often selected because of their reliability and ability to handle variable biomass fuels.
Fluidized bed boilers are suitable for projects requiring high fuel flexibility and advanced combustion control.
The final selection should consider:
The required PKS consumption depends on several factors:
For example, a boiler producing more steam will naturally require more fuel input.
A professional boiler supplier normally calculates fuel consumption based on the customer's actual steam demand and fuel analysis rather than using a fixed value.
Yes.
PKS biomass boilers can be integrated with steam turbines to generate electricity.
This configuration is commonly used in large palm oil mills and biomass power projects.
The system can provide:
A PKS biomass boiler provides a practical solution for palm oil mills and industries to convert palm kernel shell waste into reliable renewable energy. With the right boiler design and fuel management, PKS can help reduce fossil fuel consumption and support sustainable industrial operations.
Bidragon offers customized PKS biomass boiler solutions based on fuel characteristics, steam demand and project requirements.
