Abstract:

In order to explore the influence of jet structure parameters on the mixing effect of carbonization reactor，based on CFD（computational fluid dynamics） numerical simulation method，ANSYS simulation software was used to compare and study the influence law of a new type jet carbonization reactor for preparing basic magnesium carbonate at different jet positions in the reactor.A two-dimensional transient simulation was conducted on the jet reactor of CO₂ and magnesium hydroxide slurry with a flow rate of 2 m/s at room temperature.The velocity and concentration distribution of CO₂ and magnesium hydroxide slurry and the flow field distribution in the reactor cavity under different jet positions were compared.The simulation results showed that the jet velocity was the maximum in the mixing chamber，and the gas-liquid mixing was intense.After the material was shot out of the diffusion chamber，it was uniformly mixed in the reactor at a speed lower than 20 m/s.In the range of 1/2H to 1/5H of the jet position，the minimum velocity loss was 1.2% by dropping the jet position，the jet effect was more stable，and the slurry and gas were more fully mixed.In addition，the jet position had a significant impact on the slurry concentration in the cavity.When the jet position was 1/2H，the ratio of slurry and gas concentration was close to 1:1，and the material mixing effect was better.The simulation optimization results could provide a theoretical basis for the optimal design of the basic magnesium carbonate jet carbonization reactor.

Key words: jet position, carbonization reactor, mixed effect, numerical simulation