Pressurized Oxygen Blown Entrained-Flow Gasification of Wood Powder

Abstract

In the present study, an oxygen blown pilot scale pressurized entrained-flow biomass gasification plant (PEBG, 1 MWth) was designed, constructed, and operated. This Article provides a detailed description of the pilot plant and results from gasification experiments with stem wood biomass made from pine and spruce. The focus was to evaluate the performance of the gasifier with respect to syngas quality and mass and energy balance. The gasifier was operated at an elevated pressure of 2 bar(a) and at an oxygen equivalence ratio (λ) between 0.43 and 0.50. The resulting process temperatures in the hot part of the gasifier were in the range of 1100–1300 °C during the experiments. As expected, a higher λ results in a higher process temperature. The syngas concentrations (dry and N2 free) during the experiments were 25–28 mol % for H2, 47–49 mol % for CO, 20–24 mol % for CO2, and 1–2 mol % for CH4. The dry syngas N2 content was varied between 18 and 25 mol % depending on the operating conditions of the gasifier. The syngas H2/CO ratio was 0.54–0.57. The gasifier cold gas efficiency (CGE) was approximately 70% for the experimental campaigns performed in this study. The synthesis gas produced by the PEBG has potential for further upgrading to renewable products, for example, chemicals or biofuels, because the performance of the gasifier is close to that of other relevant gasifiers.

Influence of H 2 O, CO 2 and O 2 addition on biomass gasification in entrained flow reactor conditions: Experiments and modelling

“…These studies show a high influence of gasification atmosphere both on carbon conversion and on the product gas composition. Recently, several biomass EFR pilot facilities have been built to study biomass gasification in conditions close to those of an industrial plant [12,13].…”

Synthetic Diesel Production as a Form of Renewable Energy Storage

“…Therefore, syngas pass through a water bath at the bottom of the gasifier. The water vapor content of the syngas output from the water bath (stream 4) is enough to drive water gas shift reaction to increase hydrogen percentage of syngas stream [9]. So, stream 5 directly enters the shift reactor before cooling down to near-ambient temperature and losing its water content in a water knockout tank prior entering to the Selexol unit (stream 8).…”

“…This type of gasifier has high operating temperature which allows production of high quality syngas with negligible amount of tar. They also are insensitive to input feedstock and consequently are suitable for gasification of wide range of biomass feedstocks [9][10][11]. There are several studies that consider production of synthetic diesel from biomass resources [12][13][14][15][16][17][18][19], and recent advances in catalytic application of layered double hydroxides [19] is just one of many innovations that have been brought forth recently.…”

Gasificación de madera para la obtención de un syngas útil en la producción de biocombustibles y/o productos químicos

“…En el primer trabajo seleccionado, reportado por Weiland et al en 2013 [37], los autores reportan la gasificación de madera (pino y pícea) en una planta piloto de gasificación en lecho arrastrado. Los experimentos se llevaron a cabo a una presión de 2bar, realizando variaciones de la relación equivalente, λ entre 0,43 y 0,5, usando oxígeno como agente gasificante.…”

“…Para realizar la validación, se simularon los procesos de gasificación descritos por Weiland et al en los dos trabajos seleccionados [37,38] ingresando al gasificador la biomasa de acuerdo a la composición reportada por cada uno de los autores y las respectivas condiciones de operación. Posteriormente, se compararon las variables respuesta predichas por el modelo con los datos experimentales reportados para la composición molar del gas (H 2 ,CO,CO 2 y CH 4 ), LHV, relación H 2 /CO, CGE y temperatura de torrefacción.…”