Vertically Integrated Gasification and Combustion

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VIGC Explained

Employing a two-phase process – gasification followed by combustion, AESI’s biomass fueled energy plants fully apply the process of first converting the solid fuels to a gaseous phase followed by combustion of the syngas via a fire tube boiler heat exchanger to produce heat or steam. This process, which is the most efficient means to deliver biomass derived thermal energy is called vertically integrated gasification and combustion (VIGC).

With VIGC, gasification actually separates or elutes combustible gas from a solid in a controlled temperature, oxygen starved chamber.  This synthetic gas is then mixed with air and combusted, to produce thermal energy as the system’s output. It is a somewhat subtle, but critical difference to other biomass gasification systems that require extraction and processing of produced syngas prior to use in other equipment. VIGC eliminates the cost and complexities associated with syngas extraction and processing by going direct to energy output.

Wanting the energy but not emissions our Italian partners at Uniconfort, Sri, have perfected this conversion process of VIGC in a highly deployable, robust machine.   They have been solely focused on solid fuel technology for energy production for over 50 years in Europe.  As their OEM for the Americas, AESI dispatches this application with US fabrication and turnkey delivery.

Key Features

Vertically Connected Chambers – These units are crafted via multiple chambers, each with its design of geometry and passes which in part delivers a lower transmission velocity, alternating turbulence and complete consumption of fuel calorific content.

Sequential Supply Of Combustion Air - Control of the air to fuel ratios within these machines is precise and reliable. In the first stage, only the amount of air needed to maintain an autothermal condition in the base level is delivered. This allows continued “cooking” of the biomass, successfully driving of fuel in gaseous state, then in successive chambers more air is added and temperatures quickly rise. It is the absolute completeness of this application that delivers the highest fuel to energy conversion, best value of fuels consumed, and minimizes any emissions content.

High Mass In Construct – The AESI systems are among if not the heaviest in the market place. From the steel in the frames to the high alumina content brick refractory, these units achieve their robust construct, resistant to thermal and abrasion forces that occur in any such device.

Controlled, Water Cooled Feed and Extraction – Starting at 500 C, and finishing at 1300 C is a lot of focused energy exisiting hour after hour as these machines work. Using air in any fashion as a cooling medium is self limiting at the onset, as a high likely hood remains of altering fuel to air ratios in the unit. Instead, the AESI systems utilize low volume water flows in both the feed grates and the ash removal system. The combination of controlled thermal energy release and these water cooled features is what allows our units to operate without formation of slagging and clinkering. This is important as this feature allows use of fuels with high inorganic contents, up to 15% ash, and materials with specific make up challenges such as found with materials like rice hulls.

VIGC Process Outputs

  • Hot Air
  • Hot Water
  • Steam
  • Thermal Energy
  • Electricity

VIGC Benefits

  • Lower emissions
  • Higher calorific value extraction from fuels
  • Broader fuel type acceptance
  • Extended useful life of system
  • Better value – life cycle cost analysis
  • Lower maintenance costs
  • Improved system efficiency
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