No abstract

The generation of syngas via gasification is accompanied by greenhouse gas emissions and certain impurities like tar. This is the major problem that makes the technology unattractive for commercialisation. Tar content present in the syngas limits its application as it causes damage to engines, while the CO2 that accompanies it adds to the climate issues when released to the atmosphere. In this short review, an overview of techniques used for tar abatement, CO2 capturing, and potential areas of CO2 utilisation were discussed.

In this paper, a theoretical analysis on the performance of a thermally driven twostage four-bed adsorption chiller utilizing low-grade waste heat of temperatures between 50°C and 70°C in combination with a heat sink (cooling water) of 30°C for air-conditioning applications has been described. Activated carbon (AC) of type Maxsorb III/HFC-134a pair has been examined as an adsorbent/refrigerant pair. FORTRAN simulation program is developed to analyze the influence of operating conditions (hot and cooling water temperatures and adsorption/desorption cycle times) on the cycle performance in terms of cooling capacity and COP. The main advantage of this two-stage chiller is that it can be operational with smaller regenerating temperature lifts than other heat-driven single-stage chillers. Simulation results shows that the two-stage chiller can be operated effectively with heat sources of 50°C and 70°C in combination with a coolant at 30°C.

Biomass-derived fuel is a promising candidate for future bioenergy, which will reduce CO2 emissions and reliance on fossil fuels. Physicochemical analysis, pyrolysis, and gasification processes were conducted to study the potential of coconut shell biomass. According to the findings, coconut shell biomass includes numerous important components, and the temperature affects both the characteristics of the charcoal, and the syngas composition. The lowest temperature generates the most charcoal (41.85%), whereas the highest temperature produces the most energy (32 MJ/kg). At the maximum temperature, a good gas composition was obtained (14.15% H2, 15.22% CO, 13.98% CO2, and 10.13% CH4 concentration, respectively).