Case Study 3 - Float Glass Industry

Waste Heat Recovery from hot gases exhausted by Float Glass Melting Furnace

System Description

Initial Situation

Float glass melting furnace operates on liquid or gaseous fossil fuels
The furnace exhausts huge quantities of flue gases at high temperature to atmosphere

Challenges

Recover and convert waste heat in to more usable form of energy to fulfill requirements of the process plant
Glass melting furnace operates at negative draft of -5 mm wc approx. The system is to be suitably designed without affecting the normal operation of the furnace

Solution Provided

Waste Heat Recovery boiler on hot gases exhausted by float glass melting furnace
Vertical, bare-tube, cross flow type boiler
Engineered to prevent cold-end corrosion
Lesser floor space requirement
Fully automatic pneumatically operated three way diverter valve to ensure continuous operation without affecting operating pressure of the furnace

Results

Parameter	Description
Mode of Heat Recovery	Steam generation from glass melting furnace exhaust gas
Application	Process Use
Exhaust Gas Temperature at inlet of WHRB	350°C
Net Steam Generation	1100 kg/hr
Operating Steam Pressure	10.54 kg/cm2(g)
Quality of Steam	Dry and saturated
Net Heat Recovery	730114 kcal/hr

Process Schematic

Installation Photograph