KeyTor
KeyTor is Keystone Energy’s continuous torrefaction technology — the process behind every plant on this site.
The technology
- Process
- Continuous torrefaction, 200–350 °C, low-oxygen
- Capacity
- 50 to 1,000 TPD of input, modular
- Feedstocks
- MSW, RDF, biomass, STP sludge — in any combination
- Availability
- Engineered for 6,000+ operating hours per year
- IP
- Indian patent applications 202211023704 and 202211023710
What KeyTor does
Torrefaction heats waste to between 200 and 350 °C in a controlled, low-oxygen environment. Moisture and volatile compounds leave; what remains is dry, brittle and carbon-dense. The result handles and grinds like coal, which is what allows it to move through equipment that was designed for coal.
KeyTor is the continuous version of that process. Feedstock moves through the reactor without stopping, rather than being cooked in discrete loads. Two things follow from that. Output quality is steadier, because conditions do not swing between the start and end of a batch. And the plant can be engineered to run 6,000 or more hours a year, because it is not repeatedly heating and cooling.
What goes in, and what comes out
KeyTor takes four feedstock families, in any combination. Energy content of the output depends substantially on which:
| Feedstock | Output calorific value (Kcal/kg) |
|---|---|
| Woody biomass | 3,700 – 6,000 |
| Rice straw biomass | 4,000 – 4,300 |
| Refuse Derived Fuel (RDF) | 3,800 – 4,000 |
| Municipal Solid Waste (MSW) | 3,700 – 4,000 |
| Undigested STP sludge | 3,500 – 3,800 |
Sludge sits at the bottom of that range because it arrives wet and more of the input energy goes into drying it. Woody biomass has the widest spread because species and moisture vary considerably.
Where KeyTor is running
| Capacity | Input | Client | Location | Status |
|---|---|---|---|---|
| 100 TPD | Legacy waste RDF & biomass | Keystone Greentech | Warangal, Telangana | Fully commissioned |
| 500 TPD | MSW | NTPC Ltd. (via NVVN) | Gorakhpur, Uttar Pradesh | Commissioning |
| 200 TPD | Rice straw biomass | TransPacific Engineers | Sangrur, Punjab | Commissioning |
| 50 TPD | STP sludge | Delhi Jal Board | Delhi | Pilot completed |
Questions
What is KeyTor?
KeyTor is Keystone Energy's continuous torrefaction technology. It converts municipal solid waste, refuse derived fuel, biomass and sewage treatment plant sludge into torrefied solid fuel, and is the subject of Indian patent applications 202211023704 and 202211023710.
What makes KeyTor continuous rather than batch?
Feedstock moves through the reactor without stopping, rather than being processed in discrete loads. This gives steadier output quality and allows the plant to be engineered for 6,000 or more operating hours a year.
What plant sizes does KeyTor support?
Modular configurations from 50 to 1,000 tonnes per day of input. Delivered plants range from a 50 TPD STP sludge pilot for Delhi Jal Board to a 500 TPD municipal solid waste plant for NTPC in Gorakhpur.
What feedstocks can KeyTor process?
Municipal solid waste, refuse derived fuel, woody biomass, rice straw and agricultural residue, and undigested sewage treatment plant sludge, in any combination.
What is the calorific value of KeyTor output?
It depends on the feedstock. Measured ranges are 3,700 to 6,000 Kcal/kg for woody biomass, 4,000 to 4,300 for rice straw, 3,800 to 4,000 for refuse derived fuel, 3,700 to 4,000 for municipal solid waste, and 3,500 to 3,800 for undigested STP sludge.
Phone
+91 011-69952419Copyright © 2026 Keystone Energy Systems LLP and Keystone Green Energy Pvt. Ltd. All rights reserved.