In this study, a hydrogen fuel jet-stabilized combustor is proposed, the combustion flow characteristics are numerically investigated under the conditions of three equivalence ratios (1, 0.37, and 0.22), and the effects of hydrogen flow rate assignment on the combustion flow are also analyzed. The results show that it is easier for the multijet scheme to form a full and stable vortex structure pair in the recirculation zone under lean conditions than the single-jet scheme, and it has a uniform reaction rate to form larger combustion zones, which makes it easier to achieve flame stabilization. The combustion efficiency of two fuel jet schemes is less than 65% when the equivalence ratio is 1, and complete combustion can be achieved under lean conditions; however, the outlet temperature distribution factor (OTDF) is basically the same. For the multijet scheme with an equivalence ratio of 0.22, as the flow rate assigned to the central jet decreases, a stable and full vortex pair is formed in the recirculation zone, and a high-temperature region can be formed under each working condition, but its area decreases with the central jet flow rate. The combustion efficiency in the recirculation zone increases first and then decreases as the central jet flow decreases, and the OTDF decreases with it.
In view of the powder feeding system, a multi-physical coupling model of the gas-powder-piston was established based on the Euler-Euler two-fluid model. The numerical simulation method was applied to explore the effects of dense gas-solid flow characteristics under different operating pressures. The results show that gas-solid pulsations at different operating pressures are mainly concentrated in the upper part of the powder tank. An elevated operating pressure efficiently decreases the powder layer area (εp = 0.1) fluctuation. As the operating pressure increases from 0.5 MPa to 3.0 MPa, the rising time and fluctuation rate of pressure are reduced by 71.4% and 62.3%, respectively, and the pressure in the tank has a long stabilization period. Meanwhile, the variation of the instantaneous powder flow rate is more stable and its average value is closer to the theoretical. A high-pressure environment is more conducive to the stable transportation of powder.
In evaluating the reservoir physical properties and boundary characteristics of gas wells, the well test interpretation method is mainly employed currently to obtain K, KH, S and boundary characteristics of the reservoir. This method requires a test system for gas wells and a pressure gauge to record the data of flowing bottom hole pressure (FBHP) at the middle depth of the gas reservoir, with long testing time and high cost. Therefore, productivity testing and test pressure recovery data are only performed for some gas wells, and we cannot get reservoir physical property parameters by well test interpretation. It is considered that this method can better meet the needs of practical work, and has high popularization and application value.
The minimum critical liquid carrying flow rate of gas wells is an important parameter in the process of making gas reservoir development plans. At present, Turner equation and Li Min equation in the field are mainly used to calculate the critical liquid carrying flow rate of gas wells. However, the two equations have some limitations, which do not consider the effect of interfacial tension on the critical liquid carrying flow rate. In calculation, the gas-water interfacial tension is simplified as a constant, but interfacial tension is a function of temperature and pressure. In order to calculate the minimum liquid carrying flow rate more accurately, the existing calculation equation is modified while considering the influence of temperature and pressure on interfacial tension. The equation of minimum production is obtained by deducing the minimum flow rate of liquid carrying in gas wells. The actual gas well data is used for example calculation, and the minimum production under different well depth, bottom hole temperature and pressure is analyzed. The results show that considering the interfacial tension when calculating the fluid carrying flow rate of gas wells, the calculated fluid carrying flow rate of gas wells is more realistic.
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