Combined Heat & Power (CHP) for biogas
What is a Combined Heat and Power ( CHP)?
Biogas Combined Heat and Power (CHP) units are advanced systems that convert organic waste into renewable energy, providing a sustainable solution for energy production and waste management. These units utilize biogas generated from the anaerobic digestion of organic materials, such as agricultural manure, food waste, household waste, green waste, offal, and sewage.
In a Combined Heat and Power (CHP) system, also known as a cogeneration system, biogas (a highly flammable gas) is supplied to a spark-ignition internal combustion engine or gas turbine to generate electricity. During operation, the engine produces waste heat from exhaust gases and cooling systems, captured and repurposed to maximize energy efficiency.
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Dual-process efficiency
One of the most significant advantages of biogas combined heat and power (CHP) units is their remarkable efficiency. These systems capture and utilise the energy produced during biogas conversion, leading to an overall energy efficiency of between 80% and 90%. This high-efficiency level stems from their ability to simultaneously generate electricity and heat, which allows for effective energy utilisation across various applications.
Electric Generation:
- The conversion of biogas to electricity typically achieves efficiencies of around 30-40%, depending on the technology used. This means that a substantial portion of the energy contained in the biogas is effectively transformed into usable electrical power.
- The electricity generated can power various facilities, including farms, wastewater treatment plants, and industrial operations. It can also be fed into the grid, providing a renewable energy source to local communities.
Heat Production:
- During the electricity generation process, the unit’s internal combustion engine produces a significant amount of heat as a byproduct. Biogas CHP units capture this heat instead of releasing it into the environment, maximising energy use.
- Heat recovery systems, which generally heat water with heat exchangers from the exhaust manifolds and coolant systems, can achieve efficiencies of 50-60%. This allows for the recovery of energy that would otherwise be wasted. This recovered heat can be used for multiple applications, significantly enhancing the system’s overall efficiency.
Below are examples of utilising this thermal energy produced can be used:
- Industrial and agricultural processes.
- Heating for buildings
- Providing heat for the AD plant when required
Biogas CHP units improve energy efficiency and contribute to a more sustainable energy landscape by effectively combining electric and heat production. This dual output reduces energy costs and lowers greenhouse gas emissions, making biogas CHP an environmentally friendly option for industries, farms, and facilities needing reliable, renewable energy and heating solutions.
Combined Heat & Power (CHP) for biogas
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How it works
Carbon Neutral
Biogas CHP units are essential for reducing greenhouse gas emissions by turning organic waste into energy and preventing the release of methane, a potent greenhouse gas, into the atmosphere. The CO₂ in biogas is approximately equal to the CO₂ absorbed by organic matter during its growth, resulting in a carbon-neutral system that includes animal-derived products in the carbon cycle. This method supports a circular economy by converting waste into a valuable, renewable resource.
Combined Heat & Power (CHP) for biogas
How it works
Versatile CHP Solutions
Biogas Combined Heat and Power (CHP) units offer great flexibility, making them suitable for a variety of applications, such as farms, food processing plants, and municipal waste treatment facilities. They can be scaled to meet the specific energy and waste stream requirements of different operations, making them a versatile option for both large and small producers.
The range of units is extensive, offering models suitable for various applications. These units are available in two primary size and capacity categories, ensuring compatibility with smaller and larger operational needs. All units generate 230/400V AC power supply at a frequency of 50Hz, with a 3-phase configuration. Additionally, they are engineered for continuous, uninterrupted performance and are fully rated for 24/7 operation, allowing for reliable, round-the-clock functionality in demanding environments.
Micro:
From 8kW:
Gas consumption 0.396m3/kw.h
Thermal output 20.4kWt
Engine displacement 2,770cc
Overall efficiency 90.9%
To 100kW:
Gas consumption 0.322m3/kw.h
Thermal output 168kWt
Engine displacement 8,300cc
Overall efficiency 84.4%
High Power:
From 120kW:
Gas consumption 0.297m3/kw.h
Thermal output 178kWt
Engine displacement 8,900cc
Overall efficiency 84.8%
To 500kW:
Gas consumption 0.298m3/kw.h
Thermal output 719kWt
Engine displacement 40,000cc
Overall efficiency 82.9%
How it works
CHP units offer two operational modes
Non-synchronous: Generate power exclusively for on-site consumption, meeting all local energy needs.
Grid-synchronous: Supply excess electricity back to the grid, boosting your facility’s reliability and efficiency and the grid’s overall stability.
Battery storage: Additionally, integrated battery storage can be part of the system to balance energy demands. This synchronous approach charges the battery store when excess power is available and are drawn from when needed.
How it works
Combined Heat & Power (CHP) for biogas.
Advantages
Economically attractive: Investing in biogas CHP technology can lead to significant cost savings. By generating their energy, businesses can turn waste streams into profit, reduce reliance on external energy sources, and shield themselves from fluctuating energy prices. Additionally, many governments offer incentives for renewable energy projects, making this an economically attractive option.
Summary: Biogas CHP units represent a powerful tool for sustainable energy generation, waste management, greenhouse gas reduction and carbon neutrality, making them vital to the transition to a more sustainable, green future.
Combined Heat & Power (CHP) pictures
