Experimental Research Of Inner-Cone Supersonic Gas Separator In Low Pressure Ratio

Gas mixture separator is widely used, especially in natural gas dehydration. Supersonic gas separator (SGS for short) adopts low-temperature condensation technology. Compared with the traditional separator, it has a broader application prospect for no moving part and no expensive additive. While such kind of devices designed by all the domestic institution don’t have commercial application capability, because of unacceptable large pressure lose and lower efficiency.To solve these problems, a new type of inner-cone SGS device has designed and manufactured in this paper. In order to match its appropriate structure parameters, numerical model and experimental equipment are founded to verify and illustrate mutually, the effects of droplet enlargement technology, operation and structural parameters are studied. The conclusions are as follows.(1) The calculation model for gas mixture which contains spontaneous condensation has been established. The simulation results show that the fluid flow and condensation status in the inner-cone device tally with actual situation. Discrete phase model for particle flow state of droplet enlargement technology has been set up. The particle status reveals that injecting liquid water at2L/h to the outside wall of inner cone throat, the atomized particle can play a role of nuclear and won’t cause pollution. All above, the numerical calculation models can be used to direct structure design and analyze experimental results. Ultimately, the inner-cone SGS device sets1.228as the best area ratio, and60mm as the height of swirling generator. A proper range of structural parameters are proposed according to these values and simulation. Then the experimental inner-cone SGS equipment is designed and manufactured.(2) The experiment system is set up to study effects of droplet enlargement technology and other parameters to the performance of inner-cone SGS equipment, such as additive flow rate, pressure ratio, height of swirling generator and area ratio. Experiment results show that the droplet enlargement technology can effectively improve separation performance. Considering this technology, increasing pressure ratio and area ratio, a highest separation efficiency of this equipment can be got. Reducing additive flow rate and height of swirling generator, increasing pressure ratio and area ratio in a range, the pollution rate by using droplet enlargement technology can be brought down. Conversely, flow losses will be raised. (3) Setting pressure ratio as1.5, and the exit pressure latm, adopting droplet enlargement technology, the elimination rate can get29.1%, dew point depression be9.23℃, the pollution rate and flow losses be within an acceptable range.(4) A new kind of guiding cone supersonic gas separator (guiding-cone SGS for short) is proposed. Continuously and feasible adjusting area ratio is its greatest advantages. Simulation results show that, the temperature drop has increased33.3%and swirl acceleration double increased at the same pressure ratio of1.5, comparing with the inner-cone SGS. All the data indicates that the guiding-cone SGS possesses experimental ability.