In view of the large fluctuation of the gas turbine load in the distributed energy system, the current researches on Organic Rankine Cycle (ORC) pay more attention to the comparison of the thermal performance of the same heat absorption with the initial parameters, but rarely consider the impacts of decrease in both flue gas temperature and mass flow rate on system performance causing by the gas turbine load reduction. Based on the characteristic model constructed by HYSYS platform, optimization scheme of the variable working condition ORC working medium was studied using the narrow⁃point temperature difference in the heat exchanger as the constraint condition. Under the variable load condition of gas⁃fired power plants, the operating parameters of the maximum net output power of the system are optimized. The cycle performances of varies working fluids with different compositions were compared of the characteristics of heat rate, mass flow and AP. The net output of R152a system shows obvious advantages on the heat rate and mass flow rate, compared with that in the mixed working medium in the selected working condition range, while the condenser AP value and the system heat recovery rate exhibit opposite performance. This work provides a reference database for the studying of the binary non⁃azeotropic mixture of ORC system.

In the process of solid⁃state mining of deep⁃sea natural gas hydrates, when the balance of temperature and pressure is broken, the hydrate slurry in the production pipeline changes from liquid⁃solid (hydrate, seawater) two⁃phase to gas⁃liquid⁃solid (natural gas, hydrate,seawater). The three⁃phase flow of particles and seawater is the main research object in gas⁃liquid⁃solid three⁃phase flow. The Fluent simulation of the hydrate slurry flow in the vertical production pipe is performed using the CFD⁃PBM model, and the model is verified. The simulation results are in good agreement with the experimental values. The results show that the distribution of flow patterns simulated by PBM model is relatively uniform, and the size of bubbles in the flow process is mainly from small to large， the initial velocity of bubbles has a great influence on the hydraulic lifting speed of the pipeline， the turbulent kinetic energy in the slurry is 0.5 m2/s3. When the content is 0.3, bubbles will appear to be secondarily broken and broken. The bubble size distribution in the hydrate slurry system can be predicted by CFD⁃PBM to better predict the flow characteristics of the hydrate slurry after it is decomposed by natural gas.

The sulfidation and oxidation reaction of Fe ₂O ₃ and H ₂S in oil tank containing sulfur were simulated under aerobic condition. In order to evaluate the pyrophoric tendency of H ₂S corrosion product, the temperature changes were measured during the oxidation process. The effect of water on pyrophoric tendency of H ₂S corrosion product was investigated. The results showed that water had important influence on the pyrophoric tendency of H ₂S corrosion product. The pyrophoric reactivity was high in the corrosion product when  Fe ₂O ₃ sample contained some water. But the pyrophoric reactivity of H ₂S corrosion product was lower when there was no water or too much water in  Fe ₂O ₃ sample. With the same water containing, the higher the O ₂ concentration in the mixture of sulfidation gas was, the greater the pyrophoric reactivity of H ₂S corrosion product was.