GTS is developing technology that can facilitate Combined Cycle electical power generation from coal.
The business objective is to create a direct fired Brayton cycle coal "turbine" product that can be retrofitted to existing coal power plants. This unit will create electrical power directly from the pulverized coal feed as it is combusted. The exhaust from the GTS coal "turbine" then exits into the combustion furnace of the boiler adding the waste heat to the steam cycle. The combined effect produces more power from the same quantity of coal. This higher efficiency produces less emissions for the power generated.
The typical coal power plant introduces the energy from coal combustion via coal burners. Each burner produces about 10MW of electrical power. Coal is delivered to the burners from pulverizers. The pulverizers grind the coal into fine powder that can ignite and burn quickly. Hot air is mixed with the coal at a burner where it ignites and exhausts into the large furnace space. The steam boiler is at the top of this furnace space where many miles of steam tubes are heated producing steam and heating steam that is used in the steam turbine system to produce power.
The GTS "turbine" product will fit between the pulverizer and the furnace space effectivly replacing the burner. Many of these units will be added to each power plant. Each unit will produce about 20MW of power and will exhaust enough heat energy into the large furnace space to produce the replaced burner amout of 10MW. The limiting factor to the number of units that can be added to a plant will relate to the electrical capacity of the plant design and the final exhaust temperature that the GTS system will produce.
There are around 30,000 burner units in the US power fleet and about 170,000 units world wide.