Flow guide stirring device
A technology of a stirring device and a stirring tank, which can be used in mixers with rotary stirring devices, accessories of mixers, transportation and packaging, etc., and can solve problems such as inconvenience
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Embodiment 1
[0030] For the single liquid phase system, in the open stirring tank 3 with cylindrical oval bottom without baffle, the inner diameter of the stirring tank is D=300mm, the height is H=450mm, the bottom is ellipsoid, and the long and short axes are respectively a=300mm, b =240mm, the material is plexiglass with a thickness of 8mm, the liquid level height H measured from the gas-liquid interface 2 at rest 1 = 420mm. Stir with a three-blade push-down inclined blade paddle, the paddle diameter is D I =150mm, blade height D / 15, the angle between the blade and the horizontal direction is 70 degrees, the distance between the lower part of the blade and the bottom of the stirring tank is 120mm, and the inner diameter of the guide tube is D d =210mm, height H d =310mm, the installation position is based on the principle that the area of each flow channel is equal or similar.
[0031] The stirring power with or without a draft tube was measured by the on-axis torque method, and the...
Embodiment 2
[0035] For the liquid-solid two-phase system, in the stirred tank with the same structure and size as in Example 1, add silica particles, d s =63~80μm, ρ s =1970kg / m 3 , using the method of visual observation to investigate the critical rotational speed of the solid particles suspended from the bottom in the reactor with and without the draft tube when the solid content rate is 20wt%. The experimental results show that: for the reactor without a draft tube, the critical stirring speed of the suspension from the bottom is 141rpm, while the reactor with a draft tube, the speed reaches 124rpm, which satisfies the critical condition of the particle suspension from the bottom. Obviously, the flow pattern in the reactor is improved after adding the draft tube, which is more conducive to the suspension of solids.
Embodiment 3
[0037] In the stirred tank with the same structure and size as in Example 1, the liquid phase and solid are the same as in Example 2, and air is introduced through a gas distributor with a diameter of d=145mm, and the installation position is located below the stirring blade. The critical stirring speed of the solid particles in the reactor with and without the draft tube was investigated respectively, and at the same time, the dropwise addition of Na 2 SO 3 The gas-liquid volumetric mass transfer coefficient was determined by the method.
[0038] The experimental results found that:
[0039] (1) For the reactor without a draft tube, the critical suspension stirring speed is 160rpm, while for the reactor with a draft tube, the critical condition for particles to be suspended from the bottom is met when the rotation speed reaches 138rpm. Obviously, the flow pattern in the reactor is improved after adding the draft tube, which is more conducive to the suspension of solids.
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