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A method and device for determining a non-Newtonian fluid stirring dead zone in a reactor
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A non-Newtonian fluid and stirring device technology, which is applied to measuring devices, instruments, scientific instruments, etc., can solve the problems of uneven stirring and non-Newtonian fluid, and achieve the effect of saving energy
Active Publication Date: 2019-08-20
BEIJING UNIV OF CIVIL ENG & ARCHITECTURE
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[0004] Aiming at the defects in the prior art, the present invention provides a method and device for determining the non-Newtonian fluid stirring dead zone in the reactor, which is used to solve the non-uniform stirring caused by non-Newtonian fluid under special circumstances in the prior art According to different non-Newtonian fluids, different stirring dead zones can be determined, which can provide technical support for reactor design, parameter optimization and energy saving
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Embodiment 1
[0056] In this example, the non-Newtonian fluid is fresh pig manure. A HAAKE Viscotester-550 rotational viscometer was used to conduct a rheological test on the fresh pig manure with a solid content of 24.92%, to obtain an experimental curve of viscosity and shear rate. According to the above experimental curve, the Sisko model equation was used to fit the viscosity-shear rate experimental curve, and the pig manure viscosity-shear stress equation was obtained as:
[0057] μ=0.0046+9.21·γ -0.6949 .
[0058] The viscosity of the above-mentioned fresh pig manure is μ∈[0.10,2.70], that is, the limit viscosity of pig manure is 0.10Pa·s.
[0059] like Figure 4 As shown in figure a in the middle, in the embodiment of the present invention, the viscosity range is equally divided, n=10, and the shear rate γ at the tenth point 10 =160.90s -1 , whose coordinates are (160.90, 0.2744), the shear rate γ at the ninth point 9 =59.35s -1 , whose coordinates are (59.35, 0.5441), the shea...
Embodiment 2
[0065] In this example, the non-Newtonian fluid is raw sludge, and a HAAKE Viscotester-550 rotational viscometer is used to conduct a rheological test of the raw sludge with a solid content of 6.01%.
[0066] like Figure 5 As shown in the figure a, the viscosity of raw sludge is μ∈[0.10,4.09], that is, the limiting viscosity of raw sludge is 0.10Pa·s. For the range of viscosity μ∈[0.10,4.09], n=10 equal divisions are carried out, and the shear rate γ at the tenth point 10 =177.34s -1 , whose coordinates are (177.34, 0.2778); the shear rate γ at the ninth point 9 =80.38s -1 , whose coordinates are (80.38, 0.9030); the shear rate γ at the eighth point 8 =50.60.11s -1 , whose coordinates are (50.60, 1.3025). Shear rate according to (γ i -γ i-1 ) / γ i The rule of ≥0.5, the tenth, ninth and eighth points are substituted into the calculation, and it is verified by calculation that it satisfies:
[0067]
[0068] Thus, the critical point of shear rate effect γ 0 177.34s...
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Abstract
The invention relates to a method and a device for determining a stirring dead zone of a non-Newtonian fluid in reactor. The method comprises: acquiring a relation curve between the viscosity of materials in the reactor and a shearing speed of a stirring device of the reactor; acquiring a shearing speed effect critical point of the relation curve according to a pre-set algorithm; determining the stirring dead zone when the shearing speed of the stirring device of the reactor is smaller than the shearing speed effect critical point. The device is realized based on the method. The different stirring dead zones can be determined according to different non-Newtonian fluid, so that technical supports are provided for reactor design, parameter optimization and energy consumption saving.
Description
technical field [0001] The invention relates to a method and a device for determining a non-Newtonian fluid stirring dead zone in a reactor. Background technique [0002] The materials in the reactor are divided into two categories: Newtonian fluid and non-Newtonian fluid in terms of fluid properties. The fluid characteristics of Newtonian fluid are relatively clear, but the flow law of non-Newtonian fluid is more complicated. For non-Newtonian fluid, viscosity has an influence on its flow behavior. The greater the impact, the greater the viscosity, the easier it is to stick to the wall of the reactor, and the less likely it is to flow, thereby forming a dead zone and short flow in the reactor. It is difficult to directly, accurately and comprehensively predict the flow behavior and movement characteristics of materials in the reactor, making it difficult to improve and optimize the mixing effect of materials in the reactor. The reactor often has the phenomenon of uneven ma...
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