SU1212532A1 - Static mixer - Google Patents

Description

one

The invention relates to a mixing technique and can be used to blend and homogenize highly viscous liquids, in particular, melts of synthetic resins in technological processes for the production of polyester fibers, tufts and films.

The aim of the invention is to increase the mixing efficiency.

Hasujmr. 1 depicts a kneader,. longitudinal section. j. on ig. 2 - section A-A in FIG. T4 of FIG. 3, the eshores of the flow velocities; mix the liquids; in fig. 4 is a diagram illustrating the principle of operation of the mixer J in FIG. 5 is a fragment of the relative position of the openings of two adjacent plates.

The static mixer consists of a cylindrical body 1 (Fig. 1- and 2) and a block of dispersing elements - plates 2 with openings in the form of a double truncated cone, the common base of smaller diameter 3 of which is located in the mid-plane of the cross section of plate 2, and the larger base 4s lie on opposite sides of the plate, touching the same bases of the adjacent plate openings, as shown in FIG. 2. Bore sections through the plate sectors located in the central and peripheral parts of the plate are set different, which causes movement of the mass flow in the axial and radial direction: from the center to the periphery or vice versa. At the same time at the exit of the plates receives the desired plots 5-7 flow rate (Fig. 3). In order to impart to the flow of fluid, along with the radial spiral translation in the volume of the mixer, the orifice section of the holes is also reduced or increased in successive plate sectors (Fig. 2). When installing adjacent plates of a package without an angular shift relative to the longitudinal axis, the flow of fluid passing through the mixer is crushed into a series of parallel jets 8 of variable cross section shown in FIG. 4. If there is an angular shift between adjacent plates, depending on the magnitude of the shear angle, each opening of the plate 9 (Fig. 5) can mate with two four holes

ten

115

20

25

212532

adjacent plate 10, as a result,

which forms a network of intersecting channels of variable cross-section throughout the entire volume of the mixer. Flow rate plots at the exit of the plates 10–13 (Fig. 3) indicate a complex radial and at the same time spiral translational motion of the fluid through the mixer. FIG. 3 shows the diagrams of the velocity of the inlet 14 and outlet 15 of the fluid flows.

The mixer works as follows ..

A flow of highly viscous fluid, which usually has an uneven velocity profile 14 (FIG. 3) at the mixer inlet, passes through the conical apertures of the first plate, dividing into small jets, which then merge with the jets emerging from the adjacent apertures of the plate, and mixing, are separated again upon entering the holes of the next plate. Due to the different diameter of the holes in the sectors, conditions are created for accelerated or delayed passage of fluid in the central or peripheral part of the plates. At the same time, along with the appearance of the radial component of the flow movement, an alignment of the acceleration axis 5 of the input flow rate (Fig. 3) occurs and the desired pattern of diagrams 7 and 15 speeds at the exit of the mixer (Fig. 3) is achieved. Due to the different flow cross section openings also in individual sectors of the plates, installed with angular shift, the fluid flow simultaneously with the radial translational acquires a spiral-translational direction of motion (plots 10-13, FIG. 3).

The proposed device provides the CONDITIONS for the developed turbulent flow of a highly viscous fluid, as a result of which there is an effective intermixing between the central, peripheral and diametrically opposite parts of the incoming flow. The degree of flow turbulence in such a mixer is easily controlled by adjusting the diameter of the holes, shear angles and the number of dispersing elements. Due to the high mixing efficiency and homogenization, the dimensions of the static mixer are reduced30

35

40

45

50

55

l The device is characterized by simplicity and manufacturability of manufacturing and assembly. Thus, the most complex elements - dispersing plates are of the same type of construction and are easily made by the casting method, and special tools are not required to assemble the mixer. A relatively uniform distribution of fluid flow channels between the metal elements of the plates in the volume of the mixer and a constant update of the liquid layer of the wall2125324

It causes accelerated heat transfer from the walls of the mixer to the liquid and vice versa. The ability of the mixer to hold high (on the order of 120-150 atm 5) pressures that occur during the transportation of large masses of highly viscous polymer melt makes it possible to use this mixer as a homogenizer-heat exchanger 10 directly in industrial

lines of transmission and processing of melts of high molecular weight substances.

J

: 6

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Compiled by. Skachkova Editor S. Patrusheva Tehred O. Netse

Order 671 / to Circulation 578

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, -ZH-35, Raushsk nab. 4/5

Branch P1P Patent, Uzhgorod, st. Project, 4

5

Corrector Pilipenko

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Claims (2)

1. STATIC MIXER For homogenizing highly viscous liquids at elevated temperatures and pressures, comprising a block of horizontally arranged dispersing plates with holes installed in a vertical cylinder, characterized in that, in order to increase mixing efficiency, the holes in the dispersing plates have the shape of a double truncated cone with a common the base of a smaller diameter lying in the middle plane of the cross section of the plate, and the base of a larger diameter are located on opposite planes plate and share common points of contact with adjacent holes, while adjacent plates are installed with an angular shift relative to their longitudinal axis. , 2. The mixer according to claim 1, characterized in that the openings in the sectors of the plate have different passage sections. Fig! yu sya oa N3 t adjacent plate 10, resulting in a network of intersecting