Tri-generation, Combined Heat, Power & Cooling
Tri-generation, also known as Combined Cooling Heat and Power (CCHP), works in the same way as a cogeneration system, converting waste heat from the engine into either steam or additional electricity, but also integrates absorption chillers into the circuit.These chillers use the steam generated from thermal energy by the heat recovery system to produce chilled water, which is then used for industrial cooling or refrigeration.
Tri-generation technology is particularly effective for industries that have both a steam and cooling requirement.Tri-generation not only significantly reducing carbon emissions but also delivers up to 50% overall energy savings.
Tri-generation systems, which can be easily integrated with cogeneration systems, provide further utilisation of the wasted heat to reach 90.5%overall system efficiency.
Our plant at Nigerian Bottling Company (Coca-Cola) utilises tri-generation technology, saving over $200,000 in fuel cost alone. Manufacturers with a large heat and chilling requirement traditionally burn diesel in a furnace to generate steam.
Trigeneration integrates an absorption chiller into the circuit, providing a fourth usable output:
Cooling is ideal for both residential & business consumers requiring air conditioning. Refrigeration is ideal for facilities such as bottling companies and frozen food manufacturers who require chilling or freezing of their products.
Many such businesses have similar requirements for the cooling output.
COOLING IN THE FORM OF REFRIGERATION / CHILLING
The trigeneration system works in the same way as the cogeneration system, providing heat for steam and hot water as well as electricity for power.
However, a trigeneration system ( in addition to the three outputs from a cogeneration system) integrates an absorption chiller into the circuit, providing a fourth usable output: Cooling in the form of refrigeration/chilling
TRIGENERATION COMBINED HEAT, POWER & COOLING
The company has an installed capacity across West Africa of over 100 MW, and Power Purchase Agreements signed for another 450 MW. Its customers include factories, hotels and residential estates, with requirements ranging from 1 MW captive power installations to large 300 MW grid-connected plants.
Cummins Power Generation Nigeria has become one of the leading independent power producers in Nigeria, owning, financing and operating power plants throughout the country.
The first Cummins installation for NBC was at the company’s Port Harcourt factory. This all encompassing solution included load study, technical evaluation of the site, installation of optimal generator sets based on NBC’s power requirements and load spikes, plus sourcing a secure natural gas supply.
In addition, Cummins is now responsible for the full operation and maintenance of the power plant, and the 24/7 supply of reliable, cost-effective electricity.
The 5.5 MW solution operates off-grid in ‘island mode’.
The factory does not require 100% of its power output, so Cummins has partnered with Port Harcourt Electricity Distribution Company to operate as an Independent Power Producer. The factory now exports power to the grid, effectively reducing the electricity tariff for NBC and contributing directly to Nigeria’s energy supply.
Over the past three years, Cummins has deployed the same expertise at further NBC sites, generating a total of 120 million kWh. NBC has realised a saving of 50% per kWh compared to diesel-fired power generation.
The quality and reliability of the electricity generated has proven so high that NBC has been able to disconnect its grid supply and invest further in new bottling lines.
The factory now exports power to the grid, effectively reducing the electricity tariff for NBC and contributing directly to Nigeria’s energy supply.
Cummins Power Generation Nigeria has so far installed nine QSV91 gas generator sets for NBC across three locations. Four 1750 kW generator sets are installed at NBC Ikeja, and two each at NBC Owerri and NBC Port Harcourt. The Port Harcourt location also has a single 2000 kW unit. Cummins Power Generation Nigeria recently won the bid for a further two 1750 kW generator sets for another site, known as NBC Enugu.
With each installation Cummins has adapted its solution to the exact needs of the factory. Pipeline gas is not available at an NBC site in Owerri, so Cummins is supplying Compressed Natural Gas (CNG) via Powergas Africa’s ‘gas on wheels’ service. Natural gas is delivered through a virtual pipeline of high-pressure mobile storage ‘skids’ for decompression on site. This innovative solution has achieved 99.46% power availability for the customer. The new site at NBC Enugu will also operate on CNG.
The successful roll-out of gas based solutions at NBC factories around the country is testament to Cummins’ investment in the full energy value chain. From gas supply to power generation equipment, to maintenance and aftermarket teams located in the client’s own country, Cummins Power Generation Nigeria has proven its ability to deliver trigeneration technology and ensure 24/7 power where it’s needed.
The NBC Ikeja site employs four 1750 kW Cummins generator sets
A 5.5 MW solution has been installed at the NBC Port Harcourt site
Gas delivery Cummins gas power is first choice for bottling factories
Cummins Power Generation Nigeria is supplying steam, electricity and cooling for bottling factories across the country. In an initial three year period, Cummins has installed nine 1750 kW QSV91 gas generator sets and one 2000 kW QSV91 unit across three sites.
The sets power 10 single steam boilers with a total capacity of 23.6 tons of steam per hour and roll-out continue across further sites.
The customer for these extensive works is the Nigerian Bottling Company (NBC), one of the largest participants in the country’s beverage sector with 11 factories in operation. NBC’s portfolio of brands includes Coca-Cola, Sprite, Schweppes, 5 Alive juices, and Eva water.
Cummins Power Generation Nigeria specialises in natural-gas-fired, full responsibility energy solutions that allow customers to focus on their core business operations. As part of this capability, Cummins trigeneration installations capture waste heat for steam generation, hot water, heating and cooling whilst saving costs, reducing fuel consumption, lowering CO2 and NOx emissions, and generating surplus electricity for sale to the grid.
Nigerian Bottling Company
Ikeja, Owerri, Port Harcourt and Asejire
9 x Cummins 1750 kW QSV91 gas generator sets plus 1 x 2000 kW QSV91 unit
Off-grid natural gas powered trigeneration plant for bottling factories
Primary Choice Factors
Reliability and expertise
Significant cost savings
High level of power availability
Innovative Compressed Natural