Waste heat recovery from glass annealing lehrs
Our waste heat recovery system is engineered and designed to collect waste heat from annealing lehrs in the glass industry, using the recovered heat, to heat the working area called “cold end”.
The hot exhasust from the annealing lehrs, normally dispersed in the air, are turned into a valuable energy source to reduce gas consumption and therefore CO2
emissions.
The plant allow a direct saving on energy use, savings on CO2 quotas and qualify to access in Energy Efficiency scheme (if realized in Italy).
Plant description
The plant consist in an exhaust gas suction system that recover hot air from the annealing lehrs and send it to a recovery system.
The clean air from an outside inlet is heated by the transferred energy from the exhaust gas, it’s then controlled in temperature and fl ow and distributed
to the working area.
We design and size the air distribution system to achieve maximum heat recovery and deliver the hot air where it is most needed.
The system completely displace the existing heating system or is used as heating integration.
Technology area
The most important part of the plant is gathered around the “technology area” where we install:
• The flow controlled suction and distribution ventilator fans equipped with soundproof box
• The heat exchanger plenum
• The temperature control system and the free cooling bypass valve
• The fi nned aluminum heat exchanger
• The electric control cabinet with PLC operator interface providing efficiency results reporting
Heat recovery hoods
In the cooling sections of the annealing lehrs are installed hoods equipped with heat resistant curtains designed to collect only the convection motion resulting from the glass cooling process.
The number and size of the hoods are tailor made depending on the type of production and the annealing lehrs layout.
The suction fan is installed in a soundproof box for a minimum noise impact.
It’s speed and power consumption are controlled based on the actual glass production in ton/hr to optimize the heat recovery without impacting the cooling process and the initial gas consumption.