Palm Kernel Shell Charcoal Production

If you’ve ever walked through a palm oil plantation or visited a processing facility, you’ve likely seen piles of palm kernel shells (PKS)—the hard, woody byproduct left after extracting oil from palm kernels. For years, these shells were often discarded as waste, ending up in landfills or being burned inefficiently, contributing to pollution and resource waste. However, today, a game-changing solution is turning this “trash” into a valuable resource: producing charcoal from palm kernel shells.
Not only does this process reduce agricultural waste, but it also creates a high-quality, eco-friendly charcoal alternative that’s gaining popularity in cooking, industry, and even environmental projects. Let’s break down why palm kernel shell charcoal matters—and how it’s made.

Palm kernel shell (PKS), derived from the fruit of the palm tree – palm fruit. In the process of refining palm kernel oil, the kernel is first extracted from the pulp, and then the outer shell of the kernel is peeled off. The hard outer shell is the palm kernel shell.

Palm kernel shells are a good raw material for charcoal production, and here’s why:
•Abundant & Low-Cost: Palm oil is one of the world’s most widely produced oils, meaning PKS is generated in massive quantities (millions of tons annually) at near-zero cost for processing facilities.
•High Calorific Value: PKS has a dense, fibrous structure that burns slowly and releases high heat—perfect for charcoal. Its calorific value (energy content) rivals traditional hardwood charcoal, making it ideal for cooking or industrial heating.
•Eco-Friendly: By repurposing PKS, we divert waste from landfills (where it decomposes and releases methane, a potent greenhouse gas) and reduce the need to cut down trees for hardwood charcoal. It’s a circular economy win!

First, gather clean, dry palm kernel shells. Remove any impurities (like dirt, oil residues, or small pieces of palm fruit) to ensure high-quality charcoal. If the shells are damp, sun-dry them for 2–3 days until their moisture content drops to 10–15%—dry shells are critical for efficient pyrolysis, as excess moisture reduces charcoal yield and energy efficiency.

For smaller-scale production, whole palm kernel shells work fine. But for larger operations, crushing the shells into 1–3cm pieces helps ensure even heating during pyrolysis, leading to more consistent charcoal. This step aligns with biomass processing best practices for thermochemical conversion, as uniform particle size minimizes temperature gradients in the reactor.

Pyrolysis is a process in which the shells are transformed into charcoal. Scientific studies confirm that PKS pyrolysis occurs in three distinct stages (Drying, Carbonizing, and Cooling), with the main carbonization phase occurring between 150°C and 500°C. You can use different types of reactors, depending on your scale:

•Small-Scale: A carbonization furnace or a traditional earthen kiln. Place the dried shells inside, seal the reactor, and heat it slowly (200–400°C) using wood or biomass. The key is to limit oxygen—too much air will burn the shells to ash, not charcoal. This method is analogous to the Direct firing method of carbonization kiln used for similar biomass materials, which includes pre-drying, pre-carbonization, and calcination stages.

Heating time varies: 4–6 hours for small kilns, 8–12 hours for industrial reactors. Once the temperature peaks and gas release slows, stop heating and let the reactor cool completely (24–48 hours) before opening—hot charcoal can reignite if exposed to air too soon. Kinetic analysis reveals that PKS pyrolysis follows a three-dimensional diffusion model, justifying the need for controlled heating and cooling rates.

•Large-Scale: Industrial pyrolysis reactors or rotary kilns. These systems are more efficient and can process tons of PKS daily, plus capture byproducts like syngas (for energy) or bio-oil (for fuel)—a practice supported by green manufacturing technologies for biomass resources.

We’ve now successfully transformed palm kernel shells into charcoal with a higher calorific value. Palm kernel charcoal can be further processed into activated charcoal or into various shapes of barbecue charcoal and hookah charcoal.

Since this section overlaps with articles on the production of barbecue charcoal and hookah charcoal, readers can click on the article below for further information.