Enex Binary Plant
The Enex Binary Plant uses geothermal heat to produce clean, efficient and sustainable energy
The plant uses conventional ORC technology to generate electrical power up to 14 MWe in each unit, depending on the geothermal source and cooling options. Enex engineers, procures and constructs the binary plant under an Engineering Procurement Construction contract (EPC contract - Turnkey) or on BOO or BOT basis.
With appropriate information on the geothermal source and a feasibility study, Enex will deliver a proposal with power production potential and cost & efficiency analysis.
Benefits of an Enex Binary Plant :
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Sustainable heat and power generation for urban and rural areas
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Ecologically friendly power production minimizing the emission of greenhouse gases, such as CO2
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Tapping into underutilized energy resources from existing geothermal heat
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Tapping into waste heat energy resources from industry
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Baseload electricity generation, high reliability and availability
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Design, efficiency analysis, engineering, construction and training can all be performed by Enex
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Aesthetic design (see 3-D figure Enex Binary Plant)
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Adaptable to almost any geothermal resource
As a result :
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Areas become less dependent on polluting and increasingly expensive imported oil & fossil fuels, which are replaced with a renewable alternative as well as stable energy prices
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Clean, efficient, cost-effective, renewable energy that can benefit from government -supported programs and the respective CO2 emission savings can then be used for emissions quota trading
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Utilizing existing geothermal heat to generate electricity up to 17 MWe pr. unit
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Utilizing waste heat from industry otherwise discarded to create electricity and reduce the volatility of energy prices
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Possibility of incorporating district heating for communities (CHP)
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Minimal visual impact
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Maximized power production based on available geothermal heat
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35 years of experience ensures proven solutions
What conditions are necessary for the Enex Binary Plant?
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A steady source of heat, such as from geothermal fluids, anywhere from 110 °C and above
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A way to cool the working fluid, such as with natural cold water - or by using a cooling tower, wet or dry
ORGANIC RANKINE CYCLEThe Enex Binary Plant uses the conventional ORC (Organic Rankine Cycle) technology of alternately vaporizing and condensing a working fluid. The working fluid in a Rankine cycle is in a closed loop and is circulated and re-used constantly. The steam sometimes seen rising from such power plants is evaporating natural cooling water if a water cooling tower is used. The ORC can be designed with or without regeneration. It can also be designed to meet district heating network requirements. |
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The ORC can be divided into primary loop, secondary loop and cold end as seen on the schematic below (Figure 2). Enex utilizes proven industrial components. The Enex Binary Plant is flexible and tailored to meet customer needs.
Figure 2
PRIMARY LOOP
Within the primary loop, careful attention is paid to fluid chemistry in the choice of materials and inhibitors. Heat exchangers are normally of a shell and tube design, although a plate or hybrid design is used where pressure allows. Filters and seals for pumps and valves are chosen from experience in use under geothermal conditions. Careful consideration is taken to fluid chemistry.
SECONDARY LOOP
The Enex Binary Plant has high-speed single-stage inward radial-flow turbines. A high-speed turbine means high efficiency for a small investment. A gearbox is normally implemented to reduce the speed of the generator. In the secondary loop, as in the primary loop, the material is chosen with chemistry in mind, as well as cost efficiency. Filters, types of valves and axial seals are selected from prior experience in geothermal plants and the oil industry. The selection of material, control equipment and coating of electrical cables has been developed within the geothermal environment since 1963.
COLD END
The Enex Binary Plant can be equipped with three different types of cooling systems :
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The type of cooling solution selected depends upon the environment at the power plant site.
ENEX APPROACH
The Enex approach achieves high customer satisfaction while emphasizing environmental solutions. As geothermal and hydropower experts, Enex looks at several ways to structure its approach to each project, for example:
Lead Investor
Design, build and operate geothermal/hydropower plants or district heating systems. Enex may sell or transfer the plant at a predetermined date. These contracts can be BOOT (Build-Own-Operate-Transfer), BLT (Build-Lease-Transfer), BOT (Build-Operate-Transfer) or BOO (Build-Own-Operate).
Solution Provider
Engineering, procurement and construction of geothermal/hydropower plants on turnkey basis. Enex provides the equipment, expert technology and geothermal experience while teaming up with strong domestic contractors to build and install power plants or district heating systems.
Joint Venture
Team up with strong local partners such as developers or contractors. Form a joint operation company with our joint venture partner based on interest, ability and areas of strength.
ENEX BINARY PLANT PROPOSAL
To receive an Enex Binary Plant proposal all necessary info has to be available, such as:
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Information on source, temperature, pressure, mass flow and chemistry
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Ambient data
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Availability of cooling water
If the planned site is in the development stage and therefore not all information is available, you can contact Enex Project Development. Enex can offer all geoscientific services and consulting in connection with the Enex Solution.
After receipt of a tender, including all the necessary data, Enex will deliver a complete proposal within a period of two months. Presented in the Enex Binary Plant proposal is: the power-production potential (gross and net), efficiency analysis, sizing of main components, a binding financial offer, a detailed description of boundaries, and a contract proposal.
DESIGN
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Design is founded on decades of experience in both design and operation. Design also benefits from recent experiences, such as Enex's Binary Plant in Berlin, El Salvador and operational experience in HS Orka's binary units at the Svartsengi CHP plant. Enex uses a modular design, emphasising flexibility and mobility, taking careful consideration to environmental factors such as chemical, visual and noise pollution. |
OPERATION & MAINTENANCE AND WARRANTY
Enex offers warranty of both, the process in terms of minimal power efficiency, in addition to standard equipment warranty. The warranty period is a subject to negotiation in each case. Enex also offers Operation & Maintenance agreements, which will automatically lead to extension of the warranty period.