7GMG
4-cycle gas engine 7GMG (8GChN26/26) rated 860 kW is a modification of D49 engine intended for power generation at power stations of all types.
This engine is spark-ignited and uses natural or associate gas as fuel.
Cooling system is 2-circuit system with charge air cooling. The engine can be supplied with exhaust heat recovery system.
Technical characteristics
| Parameter | Value |
| Rated power, kW | 860 |
| Engine speed, min-1/ Hz | 1000/50 |
| Voltage, kV | 6,3/10,5 |
| Gas fuel type | Natural gas according to GOST 27577 |
| Fuel consumption at rated power, max., m3/ч | 285 |
| Brake specific gas consumption at rated power, m3 / kW∙h | 0,330 |
| Burning oil consumption at rated power, kg/h | 0,75 |
| Overall dimensions (generator included) (LхBхH), mm | 5570х1950х2910 |
| Major overhaul interval, years | 18 |
| Weight (generator included), kg | 19 500 |
| Top end overhaul/major overhaul intervals, h | 20 000/80 000 |
| Turbocharger availability (model) | yes |
| Heat taken away with exhaust gas at rated power, кJ/h | 267,1х104 |
| Heat, taken away through cooling system at rated power, кJ/h | 259,3х104 |
| Rated pressure of gas fuel, MPа | 0,18-0,3 |
| Ignition system | Spark-ignited system |
| Cooling system | 2-circuit system |
| Starting system | Pneumatic system or electric starter |
| Oils used | М14V2, М14G2 |
Design features
- parts standardization up to 80%;
- reliability and wear resistance of parts and assembly units;
- modular design providing high maintainability, components being interchangeable during the whole service life;
- low cost of maintenance and oil used;
- long operation life;
- engine is easily aligned with generator by means of flange connections and plate coupling resulting in lower vibrations of the whole set;
- cylinder block of dry type (no contact with cooling water and, as a result, no corrosion).