Solid waste of calcium lignin replaces fossil fuel power by gasification to reduce CO2 emissions.

Biomass can partially replace fossil fuels for power to reduce CO 2 emissions and save non-renewable resources. In the pulp and paper industry, a waste biomass of calcium lignin was obtained by treating chemo-mechanical pulp (CMP) wastewater with calcium oxide. To investigate waste calcium lignin and its potential use in power generation systems in place of fossil fuels, a basic experiment on calcium lignin gasification was conducted. A model of gasification combined power generation was developed. The results showed that, the gasification temperature was 800 °C, the equivalence ratio (ER) was 0.25, the syngas yield was 78.2 wt%, the lower heating value (LHV) of the syngas was 5.15 MJ/Nm3, and the highest cold gas efficiency (CGE) was 57.84%. In the model, the generated electricity and CO 2 emissions were 1.10 kg/kWh and 0.62 kg CO 2 /kWh, respectively. The use of calcium lignin biomass reduced 35.42% of CO 2 emissions compared to a traditional coal-fired power plant. In addition, the product value-added was 1.17 RMB per kWh, and this was 82.81% higher than that of the 0.64 RMB of traditional coal-fired power plant. [Display omitted] • Production of syngas from the solid waste of calcium lignin by gasification. • Syngas was used for power generation to reduce the use of fossil fuels. • A model was established to investigate the emission reduction effect of CO 2. [ABSTRACT FROM AUTHOR]