Method for measuring flow parameter distribution in particle fluid two-phase flow reactor

Abstract

The invention provides a method for measuring flow parameter distribution in a particle fluid two-phase flow reactor. According to the method, an extreme value multi-scale structure model is combinedwith a multi-phase flow model; a nonlinear equation set in a steady state is constructed based on force balance; variables such as acceleration are not introduced, the optimal solution can be obtainedonly by using the extreme value condition once; the method is simple and convenient in calculation process, has universality of operation conditions and universality of drainage basins, has the advantage of high calculation precision, can accurately predict flow distribution in the two-phase flow reactor, masters internal rules of the reactor, and fundamentally guarantees design, operation, control and amplification.

Description

technical field [0001] The invention relates to the technical field of particle fluid two-phase flow reaction, in particular to a method for measuring flow parameter distribution in a particle fluid two-phase flow reactor. Background technique [0002] Granular-fluid two-phase flow widely exists in energy, chemical, metallurgical and environmental industries. Non-linear non-equilibrium interactions in particle-fluid two-phase flow, such as drag interaction between particles and fluid, collision and friction between particles, etc., lead to complex non-equilibrium phenomena such as bubbles and agglomerates in the two-phase flow. Uniform structure. These heterogeneous structures have obvious effects on the pressure drop distribution, particle flux, mass and heat transfer efficiency and reaction conversion rate in industrial reactors. The drag coefficient of gas-solid interaction that traditionally does not consider the heterogeneous structure is usually 1 to 3 orders of magn...

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Problems solved by technology

In this case, the calculated value without considering the influence of the structure is very different from the actual value, and the results are in different orders of magnitude. The direct consequence is the distortion of the particle concentration in the flow field and the pressure drop distribution in the reactor during design or simulation calculation.

[0004] CN101285753A discloses a method for measuring the concentration distribution of fluid phase components in a granular fluid two-phase flow reactor. By introducing a multi-scale flow structure into the measurement process of granular fluid mass transfer, the imbalance of local mass transfer is fully considered. However, the calculation of this method takes into account the influence of acceleration, and the calculation of this method is complex and has poor versatility

[0005] CN101042310A discloses a method for measuring the distribution of non-uniform structural parameters of a particle-fluid two-phase flow system. The method improves the calculation speed to a certain extent by associating the interaction of different scales, but the influence of acceleration is still considered in this method. Not only the amount of calculation is large, the versatility is poor, but there is still a big gap with the actual operation

Although this method can obtain the non-uniform drag coefficient considering the structure, the calculation method is complicated, and it can only obtain the non-uniform drag coefficient under a certain operating condition, which is not universal

At the same time, this method is only used in circulating bed flow fields, not suitable for calculations in bubbling bed flow fields, and the calculation accuracy in turbulent bed flow fields is low, and it does not have universal applicability in flow fields

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