High yield from green mass
In the tropics and subtropics, Napier grass is widespread. The other names are King grass, royal grass, Sudanese grass, perennial elephant grass. The feature of Napier grass is high yield 40-80 tonnes per cut and 3-4 cuts per year. This grass is also a forage crop. The best biogas yield is demonstrated by the grass 120-130 days cut and 33% dry matter. This yields a biogas output of 220 m³ per ton. To provide 10 tonnes of clean biomethane per day 122 tons of Napier grass per day are needed.
The construction of decentralized biogas plants for generating power on islands or compressed biomethane in cyllinders in remote areas is especially feasible.
In the case of Napier grass unlike in the case of maize silage, one doesn’t need to build a silage storage for 1 year. 45 days of storage is sufficient. Silaging Napier grass is recommended for several reasons.
1st, during silaging starts the process of acidation. Milking acid bacteria works and biogas yield is as high as 680 litter/kg organic dry matter. 2nd, when it rains it's impossible to harvest Napier grass. 3rd, fresh Napier grass has a lot of air and may abruptly come afloat in a reactor. And during silaging the grass is pressed and air is removed. These are not the requirements of our technology. The reccomendations are general and applicable for all kinds of biogas technologies.
High-load reactor technology (HLR) is a game-changer, the only of its kind. HLR reactor is very robust, but twice cheaper than the old mass market CSTR. With the cheap feedstock and cheap technology, biogas projects are extremely attractive.
Feasibility and construction features
Zorg Biogas implemented the world's largest projects with the high-load reactor technology (HLR) 10.5 MW electric power at Teofipol-2 and 6 MW at Teofipol-3. Equivalent of 45 and 25 tonnes of clean methane per day. These projects use maize and amaranth silage.
Zorg Biogas performed multiple laboratory studies and batch tests of Napier grass of different ages and we are 100% confident in what we offer. You can visit our HLR biogas planrts 20 tonnes methane per day using maize. The same technology is absolutely suitable for Napier grass.
Proposal for a plant 10 tonnes BioCNG per day using Napier grass
Proposal for a plant 30 tonnes BioCNG per day using Napier grass