Condensing Heat Recovery
Basic Concepts
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Water in products of combustion is vaporized due to heat of combustion
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Water vapors absorb about 10% of fuel input
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Energy lost to atmosphere with exhaust gases through stack
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Heat of vaporization can be recovered if flue gases are cooled below water dew point
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When water vapor condenses, it releases heat of vaporization
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Condensing economizer recovers both heat of condensation (latent heat) and sensible heat
Typical Applications
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Industries with steam boilers, requiring large amounts of hot water such as make-up, washing, process, DHW
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Best Candidates Include:
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Textile, commercial laundries
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Food and beverage industries
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Breweries
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Non-integrated paper mills
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Chemicals
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District heating
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Large hospitals
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Green houses
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Types of Economizers
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The industry comprises two types of technology; Direct Contact and Indirect Contact Economizers. EKO Green Energy will work with your engineers to determine the appropriate technology for your facility’s needs based on the following key considerations:
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Space for installation, stacks, icing due to plume impingement, indoor outdoor installation etc.
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Cost savings, installed cost, payback
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Direct versus Indirect?
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»» Site specific, customer preference, cost, temperature requirements, application, heat sinks, etc.
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Establish how much heat is available
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»» Existing FW economizer, Flue gas temperature, excess O2, steam production, gas consumption, hours of operation
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Are there sufficient heat sinks available?
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»» Boiler make-up water, domestic hot water, process water
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Entering temperature of heat sink must be below dew point to cause condensation
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Evaluate impact on existing system including blow down, flash steam, DA, water treatment etc.
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Fuel used
A Responsible Investment In Sustainability
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Reduce Fuel consumption by up to 30%
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Reduce Green House Gas Emissions
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Reduce Maintenance, Service, and Insurance Costs​
Applications
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Domestic water heating
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Hydronic (space) heating
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Fresh air heating
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Boiler make-up water pre-heating
Technical Advantages
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Increase of up to 30% in fuel efficiency
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Reduction of greenhouse gas emissions
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Rapid return on investment (18-36 months)
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Maximum efficiencies: close between 95% and 99%
(based on HHV) -
Minimum maintenance
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No supervision required
(unit is not classes as pressure vessel) -
Rapid unit start-up (instantaneous hot water production)
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Outdoor installations possible (reduction of insurance costs)
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Entirely fabricated of high grade stainless steel