50 Years Of Trust | Engineering The Next Energy ERA
50 Years Of Trust | Engineering The Next Energy ERA
Waste Heat Boilers | Heat Exchangers | Turning Industrial Waste Heat into Productive Energy | Waste Heat Thermal Oil Heaters
Every industrial plant exhausts enormous quantities of heat through flue gases, process exhaust, hot surfaces, cooling streams, and furnace off-gases — heat that is generated at significant fuel cost and then thrown away. ISOTEX Waste Heat Recovery Systems capture this energy and return it to your process — delivering one of the highest-ROI investments available in industrial energy management.
Certified Design
In most industrial plants, 15–40% of the total fuel energy input escapes as waste heat — primarily through boiler flue gases, furnace exhaust, process off-gases, diesel generator (DG) exhaust, kiln off-gases, and hot process streams. This heat has already been paid for through fuel expenditure. ISOTEX Waste Heat Recovery (WHR) Systems are engineered to capture this lost energy and return it to productive use — as steam, hot water, thermal oil pre-heating, combustion air pre-heating, or direct process heating — with outstanding economics and rapid payback.
ISOTEX designs, manufactures, and supplies a complete range of Waste Heat Recovery equipment — from Recovery Boilers (WHRB) for steam generation from process exhaust, to complete WHR system packages covering heat exchangers, steam drums, headers, ducting, and SMARTWIZ IoT monitoring — all engineered, fabricated, and certified to IBR and ASME standards at our Ahmedabad and Dahej manufacturing facilities.
Our WHR systems serve industries operating boilers, furnaces, kilns, diesel generators, gas turbines, incinerators, and high-temperature process equipment — wherever significant waste heat is being exhausted to atmosphere, ISOTEX can engineer a cost-effective recovery solution that reduces fuel bills, cuts CO₂ emissions, and improves overall plant energy productivity.
Every 6°C reduction in boiler flue gas exit temperature = ~1% improvement in boiler efficiency. ISOTEX WHR systems routinely achieve 30–80°C flue gas temperature reduction.
ISOTEX WHR systems are engineered for the full spectrum of industrial waste heat sources — from low-temperature cooling streams and boiler flue gases through to high-temperature kiln exhaust and DG set off-gases. Each heat source requires a different WHR technology, design configuration, and material selection — ISOTEX engineers the optimal solution for each specific heat stream.
Batch / Continuous Furnace Exhaust (400°C – 1,100°C) — Heat treatment furnaces, annealing furnaces, forging furnaces, and glass melting furnaces exhaust at 400–1,100°C — high-grade waste heat ideal for WHRB steam generation or combustion air pre-heating systems.
Rotary Kiln Off-Gas (300°C – 900°C) — Cement kilns, lime kilns, bauxite kilns, and calcination kilns produce high-volume, high-temperature off-gases — significant WHRB steam generation or ORC power generation potential.
Diesel Generator (DG Set) Exhaust (250°C – 450°C) — Industrial DG sets exhaust at 300–450°C. ISOTEX WHRB systems recover this heat to generate steam or hot water — converting a cost centre (diesel fuel + cooling) into a productive energy source. DG jacket water and lube oil cooling streams offer additional low-temperature WHR opportunity.
Reciprocating Gas Engine Exhaust (300°C – 450°C) — Biogas, natural gas, and LFG-fired reciprocating engines in captive power plants produce significant exhaust heat — recoverable via ISOTEX WHRB for steam or hot water generation alongside electricity output.
Gas Turbine Exhaust (400°C – 550°C) — Combined Heat and Power (CHP) applications: ISOTEX Heat Recovery Steam Generators (HRSG) recover gas turbine exhaust heat for steam generation — maximising overall CHP system efficiency to 80%+ from the 35–40% electrical efficiency of the turbine alone.
ISOTEX Waste Heat Recovery systems are installed across India and globally — delivering verified fuel savings, emissions reductions, and rapid payback across diverse industries and heat source types.
Waste Heat Recovery System in Polyester Industry in Gujarat
2800 KG/HR (10.54kg/cm2)
400 Deg C
60000 m3/hr
Waste Heat Recovery System in Textile Industry in CITY
1800 KG/HR (10.54kg/cm2)
400 Deg C
43000 m3/hr
Waste Heat Recovery System in Polyester Industry in City
1200 KG/HR (10.54kg/cm2)
400 Deg C
26400 m3/hr
Our engineering team responds within 24 hours. Share your capacity requirements and fuel preference. We’ll engineer the right solution.
