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Modeling method of mass transfer regulation and control model under MIHA pure pneumatic operating conditions
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A technology of operating conditions and model modeling, applied in the direction of chemical process analysis/design, etc., can solve the problems of difficult removal of sulfur and limited desulfurization rate
Active Publication Date: 2019-06-14
NANJING UNIV
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However, since asphaltene is the macromolecule with the largest relative molecular mass, the most complex structure and the strongest polarity in residual oil, the sulfur in it is difficult to remove, resulting in limited desulfurization rate in the process of residual oil hydrodesulfurization
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Embodiment 1
[0058] S100 establishes the microbubble rising velocity model under MIHA pure aerodynamic operating conditions;
[0059] Assuming that the bubbles and the liquid in the reactor both move vertically upwards, according to the previous research of the applicant, the average rising speed of the bubbles in the reactor v 32 Calculated based on the following formula:
[0060]
[0061] where v 0 , v G and v L Respectively, the average diameter of bubble sauter is d 32 The rising velocity, superficial gas velocity and superficial liquid velocity of the bubble in the infinite stationary liquid;
[0062] for v 0 , calculated based on the following formula:
[0063]
[0064] Among them, ρ L and σ L are liquid density and interfacial tension respectively, Mo is Morton number, d e is the equivalent diameter, K b is the equation parameter, the equivalent diameter and the equation parameter are related to physical properties and determined through experiments; for the MIHA sys...
Embodiment 2
[0165] This example specifically illustrates the mass transfer regulation model constructed based on the method in Example 1.
[0166] Based on the modeling method of embodiment 1, the mass transfer control model is obtained as follows:
[0167]
[0168]
[0169]
[0170] d e = d 32 (ρ L g / σ L ) 1 / 2 (4)
[0171] K b =K b0 Mo -0.038 (5)
[0172] u G =4Q G / πD 0 2 (6)
[0173] u L =4Q L / πD 0 2 (7)
[0174]
[0175]
[0176]
[0177]
[0178]
[0179]
[0180]
[0181] d max =0.75(σ L / ρ L ) 0.6 ε mix -0.4 (40)
[0182] d min =11.4(μ L / ρ L ) 0.75 ε mix -0.25 (41)
[0186] The general calculation conditions are as follows:
[0187] Crusherdiameter D 1 =0.02m; The ratio of the diameter of the bubble breaker nozzle to the diameter of the breaker K 1 = 0.5;
[0188] Residue density ρ L =800Kg / m 3 ;
[0189] Residuum interfacial tension σ L The fitting formula is as follows:
[0190] σ L =[31.74-0.04775(T+273.15)]×10 -3 (N / m);
[0191] Kinetic viscosity of residual oil μ L The fitting formula is as follows;
[0192]
[0193] (1) The effect of operating pressure on mass transfer;
[0194] The calculation conditions are as follows:
[0195] Ventilation Q G =80L / h; operating pressure P m =10~20MPa; supply pressure difference ΔP=6MPa; gas temperature T=500℃.
[0196]...
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Abstract
The invention relates to a modeling method of a mass transfer regulation and control model under MIHA pure pneumatic operating conditions. The modeling method establishes an energy conversion model ina bubble breaker by analyzing the bubble generation process under pure aerodynamic conditions, calculates the liquid flow, obtains the energy dissipation rate and the bubble scale of a gas-liquid intense mixing zone, and finally obtains a mass transfer calculation model, on the basis of the energy conversion model and liquid circulation in the bubble breaker. The modeling method of a mass transfer regulation and control model under MIHA pure pneumatic operating conditions establishes a mass transfer regulation and control model under pure pneumatic operation conditions for MIHA, comprehensively reflects the influence of the structure of a reactor, the physical properties of the system, the operating parameters, and the input energy on mass transfer, and can realize guidance for the reactor design and the reaction system design for MIHA to guide design of the efficient reactor structures and reaction systems.
Description
technical field [0001] The invention belongs to the technical field of reactors and modeling, and in particular relates to a modeling method for a mass transfer control model under MIHA purely aerodynamic operating conditions. Background technique [0002] In consideration of global environmental protection, the sulfur content of marine fuel oil must be reduced, for example, the sulfur content of high seas marine fuel oil must be reduced to 0.5%. Therefore, it is imperative to replace high-sulfur residual fuel oil with low-sulfur distillate fuel oil. Most of the sulfur in crude oil exists in residual oil, and the sulfur in residual oil is mainly distributed in aromatic hydrocarbons, colloids and asphaltenes, and most of the sulfur exists in the form of five-membered ring thiophene and thiophene derivatives. Generally, the C-S bond of the residual oilmacromolecule is broken by hydrogenolysis reaction, and the sulfur is converted into hydrogensulfide to remove the sulfur in ...
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