New Strategy of Fuel-Slurry Integrated Gasifier/Gas Turbine (FSIG/GT) Alternative for Power Generation Applied to Biomass

Abstract

The new strategy of the fuel-slurry integrated gasifier/gas turbine (FSIG/GT) concept for thermoelectric power generation is applied to the case of sugar cane bagasse (SCB). The FSIG/GT process allows fuel feeding to a power unit based on gasification using commercially available slurry pumps, thus avoiding the usual sequential lock-hoppers, also known as cascade feeding systems. It also dispenses with the need of pure oxygensometimes combined with hydrocarbonsto promote ignition of particles in the injected slurry. The fuel slurry is prepared to high dry-solid content and pumped into a dryer, from which the solid particles are fed into the gasifier. Because both units operate under similar pressures, simple rotary valves and Archimedes' screws might carry the secondary feeding. The gas is cleaned to bring the particle content and size as well alkaline concentration within the acceptable limits for injections into standard gas turbines. The work shows that no steam is needed as gasification agent, thus simplifying the process and decreasing the capital costs. Moreover, the strategy leads to higher efficiency when compared with power generation based on high-pressure steam turbines, BIG/GT process consuming SCB, and combined cycles using pressurized-chamber boilers.

Theoretical Study on the Effect of Glycerol Fraction in Slurries with Biomass Consumed by a Power-Generation Process

“…The gasification optimization was possible through the application of comprehensive simulator of fluidized and moving bed equipment (CeSFaMB, ), which has been validated − and applied ,− to gasifiers and other equipment consuming a wide variety of fuels. Detailed description of its mathematical structure can be found elsewhere .…”

“…Optimizations of every one of those situations were performed using the Industrial Process and Equipment Simulator (IPES) software. That program has been applied in previous works. − , It performs mass and energy balances around each equipment to satisfy the first and second laws of thermodynamics. The simulations provide the temperature, pressure, and composition as well other properties of every process stream.…”

“…Additionally, it is important to stress that pumping slurries largely simplifies feeding solid particles into vessels. This method has been applied for a long time and explored in several previous studies. − …”

Theoretical Models for Rates of Heterogeneous Reactions During Combustion and Gasification of Liquid Fuels in Fluidized Beds

“…An existing simulation program (www.csfmb.com) has been validated (de Souza-Santos, 1987, 1989, 1994a, 1994b, 2007, 2008, 2009Rabi and de Souza-Santos, 2003, 2004, 2008Krzywanski et al, 2016;Englebrecht et al, 2011) and used in studies involving various possibilities and consuming many fuels, including low-quality ones (Muskala et al, 2011;de Souza-Santos, 1989, 1994a, 1994b, 2007, 2008, 2009, 2015Rabi and de Souza-Santos, 2003, 2004, 2008Krzywanski et al, 2016;Englebrecht et al, 2011;de Souza-Santos and Chaves, 2012a, 2012b, 2012cCeribeli, 2012, 2013;de Souza-Santos and Beninca, 2014;de Souza-Santos and Lima, 2015;.…”

Can biomass be satisfactorily gasified under pressure using an aqueous slurry feed? Examination by simulation

“…A major flaw in all the processes is the venting direct to the atmosphere of large quantities of wet gas from the driers at high pressures e.g. 83 kg s À1 at 0.9 MPa [12], 70 kg s À1 at 2.2 MPa [11]. This is inconceivable.…”