Dandan Zhao

Effect of Adsorbent Diameter on the Performance of Adsorption Refrigeration

Adsorbents are important components in adsorption refrigeration. The diameter of an adsorbent can affect the heat and mass transfer of an adsorber. The effect of particle diameter on effective thermal conductivity was investigated. The heat transfer coefficient of the refrigerant and the void rate of the adsorbent layer can also affect the effective thermal conductivity of adsorbents. The performance of mass transfer in the adsorber is better when pressure drop decreases. Pressure drop decreases with increasing permeability. The permeability of the adsorbent layer can be improved with increasing adsorbent diameter. The effect of adsorbent diameter on refrigeration output power was experimentally studied. Output power initially increases and then decreases with increasing diameter under different cycle time conditions. Output power increases with decreasing cycle time under similar diameters.

Influence of Oxygen Concentration and Equivalence Ratio on MSW Oxygen-Enriched Gasification Syngas Compositions

Oxygen-enriched gasification for the treatment of municipal solid waste (MSW) is proposed in this chapter; mechanism analysis and thermodynamic calculations results show the advantages of lower heat loss than air gasification. The effects of oxygen concentration and equivalence ratio (ER) on gas products compositions were investigated. It was found that, during the ER range of 0.23–0.29, CO, H2, and CO2 content in combustible gas continuously increased, and CH4 content continuously decreased with the oxygen concentration in the gasification agent rising from 20 % to 100 %. Furthermore, when the oxygen concentration was 20 % or 40 %, the CO2 content in combustible gas grew constantly, and the CH4 content gradually decreased within the ER span of 0.23–0.29, however, CO and H2 contents increased then decreased when ER exceeded 0.27. In addition, when the oxygen concentration was 80 % or 100 %, the CO2 content grew, CO and CH4 content decreased gradually, and H2 content decreased when ER exceeded 0.25 and 0.27, respectively. Therefore, gas product quality could be improved through increasing oxygen concentration within a certain ER range.