Rajshree Group supplies complete Recovery Boiler systems for kraft pulp mills. The recovery boiler simultaneously burns heavy black liquor to recover inorganic chemicals (green liquor) and generate high-pressure steam for power generation.
Our 2021 project in Baroda, Gujarat included a multi-effect evaporator and recovery boiler that raised plant efficiency by 30%. Since 2003, Rajshree Group has delivered 22+ pulp and paper projects across three continents — India, Africa and the Middle East — totalling over 2,000 TPD of installed capacity.
Product Overview
It is the heart of the chemical recovery cycle, enabling mills to be self-sufficient in energy and chemicals.
Key Features
- ✓Black liquor firing system with high-capacity guns
- ✓Composite floor and lower furnace design
Applications
- Chemical recovery in kraft mills
- Steam and power generation
- Green liquor for causticising
- Reduced sulphur (RS) gas handling
- Mill energy self-sufficiency
Our Turnkey Project Process
We understand your requirements, site conditions, and budget to prepare a detailed feasibility report.
Complete process design, P&IDs, civil layout, electrical single lines, and equipment specifications.
In-house and vendor-sourced equipment manufactured, quality-inspected, and dispatched on schedule.
Our engineers supervise erection, electrical, instrumentation, and commission the plant to design parameters.
Hands-on operator training, performance guarantee trial, and ongoing technical support for the life of the plant.
Get a Free Quote
Tell us your capacity requirement and we'll send a detailed technical and commercial proposal within 48 hours.
Request a Quote →Contact Our Experts
📍 Branch Office: 1913 Gunbarrel Road, Suite 105 Chattanooga, TN 37421, USA |
📍 Branch Office: D7, Varsity Chateau, Uniport Road Aluu, Port Harcourt, Rivers State, Nigeria |
Why Choose Rajshree?
- ✅ 20+ years industry experience
- ✅ 22+ successful projects delivered
- ✅ Serving India, Africa & Middle East
- ✅ Complete turnkey — single point responsibility
- ✅ After-sales support and spare parts
- ✅ Competitive pricing and financing options
Recovery Boiler: The Heart of Kraft Mill Energy and Chemical Recycling
The kraft recovery boiler is arguably the most critical single piece of equipment in a kraft pulp mill. It serves three functions simultaneously: combusting the organic content of concentrated black liquor to generate high-pressure steam; reducing the inorganic sodium and sulphur compounds to a molten smelt for recycling to white liquor; and managing the mill's energy balance by generating the steam that powers the turbogenerator and all process heating loads. No other industrial boiler combines energy generation with chemical recovery in this way.
Rajshree Group designs and supplies recovery boilers sized from 100 to 1,500 tonnes of dry solids per day (TDS/day) — corresponding to kraft mills of 30 to 400 TPD pulp capacity. Our boiler designs use membrane wall construction, multiple air levels (primary, secondary, tertiary) for staged combustion, and combustion air optimisation systems that maximise carbon burnout while maintaining a stable reducing zone for effective sulphate reduction in the char bed.
Rajshree's recovery boilers generate steam at pressures of 40–80 bar and temperatures of 420–490°C — parameters that support efficient backpressure turbine operation for on-site power generation. Mills with Rajshree recovery boilers report average steam yields of 3.8–4.2 tonnes of steam per tonne of dry solids fired — meeting or exceeding benchmark performance for boilers in the same size class.
Rajshree's recovery boilers are designed in full compliance with BLRBAC (Black Liquor Recovery Boiler Advisory Committee) safety standards — the global gold standard for recovery boiler safety. All water-leak detection, emergency shutdown, and smelt-water explosion prevention systems are hardwired safety interlocks independent of DCS/PLC status.
Frequently Asked Questions
Countries We Serve
Rajshree Group supplies and installs our Recovery Boiler — and complete pulp & paper mill machinery — for mills across India, Africa and the Middle East, with sea-freight delivery, on-site erection, commissioning and after-sales support in every market we serve.