SU1607916A1 - Mixer of streams of fluid substances - Google Patents

Abstract

The invention relates to jet mixers and improves reliability by improving thermocyclic strength and increasing mixing efficiency. The mixer consists of a housing 1 with an axial inlet 2 and side 3 nozzles, an output axial nozzle 4 mounted coaxially inside the outer 5 and inner 6 shells with perforations, the outer sheath 5 having perforations in the area located between the axial inlet 2 and side 3 the outlet nozzles, and the inner 6 shell has perforations in the area on the side of the outlet axial nozzle 4. Between the wall of the housing 1 and the end of the outer shell 5, an annular perforated partition is installed on the side of the output axial nozzle 4 a 9. 1 z.p. f-ly, 1 ill.

Description

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Primary flow

The invention relates to slot-type jet mixers and can be used to mix water streams with different temperatures.

The purpose of the invention is to increase reliability by improving thermocyclic strength and increasing the mixing efficiency.

The drawing shows the design of the mixer.

The mixer includes a housing 1 with an axial inlet nozzle 2, a side nozzle 3 and an outlet nozzle 4, installed with a gap inside the body coaxially with the last two - the outer 5 and the inner 6 shells. One end on the side of the inlet axial nozzle of the shell 5 and 6 is connected to the housing 1, and their other ends (on the side of the output nozzle) have freedom of movement relative to the housing 1 of the mixer. The shell 5 has a perforation 7 located on the side of the outlet nozzle 4, and the shell 6 has a perforation 8 located between the inlet axial nozzle 2 and the input side nozzle 3. In the gap between the wall of the housing 1 and the end of the outer shell 5 on the side of the outlet nozzle 4 an annular a baffle 9 with holes attached to the wall of the housing 1 and / or to the end of the outer shell 5.

The mixer works as follows. In the nominal mode, the main, for example, hot stream entering the mixer through the inlet side nozzle 3 enters the gap between the housing 1 and the outer shell 5, where it is divided into two streams. One flow through the annular channel between the housing 1 and the free end of the outer shell 5 through the annular partition 9 is directed to the discharge pipe. Another flow through the gap between the housing 1 and the outer shell 5 and through the perforation holes 8 in the outer shell 5 enters the annular gap between the outer shell 5 and the inner shell 6, turns 180 ° and then through the perforations 7 is displaced with the auxiliary cold a stream that enters the mixer through the inlet axial inlet 2 and is supplied to the place of mixing of the streams through the inner shell 6. The final mixing of the streams is carried out in the discharge pipe downstream of the mixer.

The separation of the hot stream into two streams ensures the temperature control of the most complex triple-shaped zone of the mixer body 1 and the absence of thermal stresses in it. The temperature gradients and their corresponding voltages are present only in the area of housing 1 adjacent to the inlet 2 for supplying cold flow. Required cost ratio times

divided streams is provided by the appropriate selection of the annular partition 9 by calculation.

In the case of short-term shut-off of the running stream, the above-described qualitative picture of the temperature stresses in the housing at the initial moment of time remains the same, and subsequent stresses are shifted to the inlet pipe of the cold flow. When the cold flow is subsequently switched on, the original picture of the temperature stresses in the housing is gradually restored.

In the case of a short shutdown of the hot flow at the initial moment of time, the annular cavities between the housing 1 and the shell 5, as well as between the shells 5 and 6, remain filled with the medium of the hot flow and act as a heat accumulator. In addition, due to the relative

The displacement of the holes in the perforations 7 and 8 creates a shadow hydrodynamic effect, which ensures a minimum mass transfer through these holes between the cold stream and the stationary medium of the mountains r. This is the flow that fills the annular cavities between the inner and outer shells and the body shells. This increases the thermal stability of the tee-zone of the body, which is the most dangerous from the point of view of thermal cyclic strength. Thus, it is clear that

0 the proposed design of the mixer provides an increase in its thermal cyclic strength, and, consequently, increases its reliability.

Claims (2)

1. A fluid flow mixer, for example, with different and / or varying temperatures, comprising a housing with axial and lateral axial and outlet axial inlets, mounted in a housing that are coaxially outer and inner shell, one ends of which are connected to the housing and the other ends are movable relative to the housing, a portion of the surface of the inner shell is perforated, characterized in that, in order to increase reliability by improving thermal cycling strength and increasing the efficiency of the process, No, a part of the surface of the outer shell placed between the axial and lateral inlet pipes is perforated, and the apertured part of the inner shell is placed on the side of the outlet pipe. 2. A mixer according to claim 1, characterized in that it is provided with an annular perforated partition attached to the wall of the housing and / or to the end of the outer shell from the side of the outlet pipe.