Economic trends for temperature of sugarcane bagasse pyrolysis

Abstract

This work examines some aspects of sugarcane bagasse pyrolysis. Fixed bed pyrolysis was performed varying the final process temperature. Product yields and the variation of quality properties (calorific values) of bio-oil, biochar, and non-condensable gas were investigated. A mathematical model to simulate the trend of temperature that maximizes a marginal gain was developed considering the regression equations for yields and prices of products (related to market prices and calorific value of conventional fuels) and for the amount of biomass used to supply energy to the process. Two methodologies were adopted to calculate the optimum process temperature. The results showed very close temperatures (600 and 602 8C) for the best performing simulations of endogenous and fixed prices methods, with little difference between the yields of products, but with good variation between the marginal gains ($124.9/tonne and $129.8/tonne). Finally, the results of endogenous prices method for the fixed bed reactor were compared to the vacuum and fast pyrolysis reactors.

Pyrolysis of sugarcane bagasse in a fixed bed reactor: Influence of operational conditions in the distribution of products

“…The treated bagasse showed 0.09 g/g of moisture, a result that according to Lehto et al is suitable for obtaining stable and homogeneous bio‐oil. The centesimal analysis of bagasse revealed values of 0.77 g/g for the volatile fraction, 0.10 g/g for fixed carbon fraction and 0.04 g/g for the ash content . This characterizations made it possible to delimit the maximum level in the thermal degradation of the bagasse, so that it would be impossible to obtain higher yield of bio‐oil than the total volatilized material and to achieve solid waste less than the sum of the fixed carbon content and the ash content.…”

“…As described by Gonçalves et al, the sugarcane bagasse was openhearted offered by a sugarcane mill and had wetness of 0.5 g/g. The provision of bagasse occurred by drying in the sun to 0.24 g/g of moisture, and then drying in an oven with air circulation at 65 °C for 24 h to 0.09 g/g of wetness.…”

“…According to Gonçalves et al, the experimental pyrolysis unit (Figure ) is composed of a fixed bed reactor (with 34 cm available height, 4 cm internal diameter, totaling an available volume of approximately 427 cm 3 ) heated by a split tube furnace (Sanchis, power 3 kW, 220 V, maximum temperature of 1200 °C) coupled to a N1100 temperature controller, a nitrogen cylinder, a flowmeter to control the flow of inert gas, a flow meter bubbles to determine the gas flow in the module output, a thermostatic bath to feed chilled water (3.5 °C) to a condenser system (2 connected Graham model condensers with serpentine, 2 joints and 600 mm size) responsible for collecting the pyrolysis liquid, a collector flask (two‐neck round‐bottom with capacity of 50 mL) immersed in an ice bath, a pipe connected to a gas exhaust system, and pressure regulating valves.…”

Thermokinetic study of macadamia carpel pyrolysis using thermogravimetric analysis

“…[23] Through the TGA it is also possible to determine thermodynamic properties, such as enthalpy, entropy, and Gibbs free energy. [24] These data provide important information related to biomass reactivity, products favourability, and the system behaviour. [21,25] The macadamia is a subtropical tree known for its edible nuts widely used in the food industry, consumed as a snack, or used as an ingredient in many recipes and products.…”

Detailed CFD modelling of fast pyrolysis of different biomass types in fluidized bed reactors

“…Currently, energy shortages and environmental pollution problems are very serious. The use of biomass to produce fuel is a way to solve these problems, because biomass is a renewable and clean energy source . There are various techniques to convert biomass into liquid fuels, among which fast pyrolysis can produce a liquid fuel effectively.…”