JPS60227819A - Fluid mixing apparatus - Google Patents

Abstract

PURPOSE:To mix fluid uniformly and to eliminate the vibration noise by providing a nozzle to a conduit as an inner pipe of double tube structure and injecting the injection fluid into the conduit from the position wherein the tip of the nozzle is projected to the shaft core side other than the inside peripheral wall of the conduit. CONSTITUTION:The kineti energy and the thermal energy incorporated in the steam itself which is dispersed and injected from four sides into the inside of a conduit 10 from nozzles 13a-13d are allowed to collide against main fluid from the radiation directions and the mixing is accelerated with the impact energy of this moment. The mixed fluid of the stream and the main fluid is twisted along the side face of spiral elements 15-20, dispersed uniformly thereby and separated into two at each boundary region of the spiral elements 15-20 and the mixing is accelerated by repeating these division, substitution and superposition. Further, the degree of projection of the above-mentioned nozzles is preferably >=5mm..

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a fluid mixing device in which an inlet for an injection wave body is formed in a conduit for passing a main fluid. The present invention relates to a fluid mixing device for mixing fluids.

(Technical background) As a method of injecting and mixing other types of fluid into the main flow, there are 1 methods, for example, using a T-shaped pipe, a single-shaped pipe with a nozzle, or a pipe with multiple injection ports on the inlet side of the line mixer. A method is known in which a pipe equipped with an injection port is connected, and another fluid is injected into the main flow through the injection port, and the resultant synthetic stream is mixed by a subsequent line mixer.

Among these, a T-tube or a single-tube with a nozzle is used when, for example, the flow rate of steam taken in from the inlet is very small relative to the main flow, and when the amount of steam increases, there is little mixing, resulting in impact noise. There is a risk of damage to the pipes due to vibrations that occur more easily.

Therefore, it is known to adopt a nozzle or multi-nozzle system using an injector, and to increase the flow velocity of the main fluid to a certain level or higher to make the flow turbulent and mix it with the injected fluid. However, since complete mixing is not performed immediately after the exit of this device, the main fluid does not have a uniform temperature distribution. Further, when the amount of the main fluid decreases and the flow velocity becomes below a certain level, the mixing effect due to turbulence decreases, resulting in insufficient mixing with the injected fluid, which tends to cause impact sounds and vibrations.

This noise level is unacceptable under certain circumstances and has become a problem as noise pollution.

(Purpose of the Invention) This invention was made to solve the problem described in F, and is aimed at injecting an injection fluid such as steam into a conduit to mix it uniformly and suppressing the vibration noise generated at that time. purpose.

(Structure outline and operation of the invention) A first aspect of the fluid mixing device of the present invention includes a conduit through which a main fluid flows, a static mixer element disposed inside the conduit in the axial direction thereof, and a static mixer element disposed inside the conduit in the axial direction of the conduit. It consists of an outer tube that has a double-tube structure on its outer periphery and has an inlet for injection fluid, and a nozzle that penetrates the conduit inside the outer tube and projects in the axial direction from the inner circumferential wall of the conduit.

The injection fluid supplied to the conduit is guided by a plurality of nozzles protruding from the inner circumferential wall of the four-way tube toward the axis and is injected into the portion of the main fluid inside the conduit where the flow velocity is high, so that it is uniformly dispersed and mixed. Noise leaking to the outside from the injection section is significantly reduced.

As a second aspect of the present invention, in addition to the first aspect, the nozzle may be provided with an automatic valve that opens and closes based on an external signal, and this automatic valve may be opened and closed as appropriate when the device is operated. If you set the automatic valves installed on the upstream side to open in sequence when starting, and conversely to close the automatic valves installed downstream in sequence when stopped, the main fluid will flow to the nozzle when the automatic valves stop. Prevents backflow from the injection site. In addition, by opening or closing an appropriate number of nozzles during operation processing, depending on the flow rate of the main fluid, or taking noise, mixing effects, etc. into consideration, the operation can be performed in an optimal state.

(Example) Embodiments of the present invention will be described based on the drawings.

Figures 1 to 3 show the first embodiment;
0 is a conduit through which the main fluid flows from the left to the right in the figure, 11
is an inlet that takes in steam as the injection fluid from above in the figure.

The downstream side of the injection port 11 communicates with an outer tube 12 that surrounds the outer periphery of the conduit 10 and forms a double tube structure with the conduit lO. Inside this outer pipe 12, four nozzles 13 (13a-
13d) are provided with their tips facing substantially in the same axial direction, and these four nozzles 13a to 13d are arranged as one set at six locations at substantially equal intervals in the axial direction of the conduit 10.

(Note that the nozzle distribution is selected in both the circumferential direction and the axial direction based on the dispersive mixing effect and noise suppression effect according to the diameter of the conduit, etc.) A total of six spiral elements 15 to 20 are arranged, which are divided into two and twisted approximately 180 degrees around the axis, and the boundary areas of these spiral elements 15 to 20 are arranged continuously so that their shaft ends are perpendicular to each other. It will be done.

The steam dispersedly injected into the conduit 10 from all sides from the nozzles 13a to 13d causes its own kinetic energy and thermal energy to collide with the main fluid from the radial direction, and the impact energy at that time promotes mixing. These mixed fluids of steam and main fluid are mixed with spiral elements 15 to 20.
is evenly distributed by being twisted along the sides of the
Also spiral elmmen) 2 for every 15 to 20 boundary areas
These divisions, substitutions, and superimpositions are repeated to promote mixing.

The degree of protrusion of the nozzle is preferably at least 5 mm,
Depending on the diameter of the conduit, it is preferably about 1/12 to 1/4 of that (more preferably 1/8 to 1/'6'). The nozzle diameter is also appropriately selected within the range of about 5+ om - 15 mm (however, it is further variable depending on the conduit diameter).The nozzle angle can be arranged perpendicularly or obliquely to the conduit axis, and the It is also preferable from the viewpoint of the mixing effect that the flow direction is diagonal or diagonal.

FIG. 4 shows a second embodiment, which is basically the same as the configuration shown in FIG.
Automatic valves 21 (21a to 21e) that open and close are provided.

In this embodiment, a total of 20 automatic valves 21 are arranged in five rows in the axial direction of the conduit. As shown in Figure 5 (A) and (B),
These automatic valves 21a to 21e are opened and closed by an air signal as an external signal supplied to the air cylinder 22, and at the time of starting, the automatic valves 21a, 2lb,
-21e in order as shown in FIG.
5 (A) in this order.

In this way, the first. According to the second embodiment, the nozzles 13a-13d protrude somewhat in the axial direction from the inner circumferential wall 10a of the conduit lO, so that the nozzles 13a-13
d The jetting sound of steam and condensation sound are reduced,
Coupled with the double tube structure, the vibration noise leaking outside from the outer tube 12 can be considerably suppressed.

Furthermore, in a device equipped with an automatic valve 21 as in the second embodiment, the automatic valve 21 is opened or closed according to a predetermined order when starting or stopping, so that when the valve is opened, the main fluid It is possible to prevent impact noise (hammering) generated when steam suddenly comes into contact with the steam, and when the valve is closed, it is possible to reliably prevent the main fluid from flowing back to the injection port 11 side through the nozzle 13.

In this case, when the Y fluid is directly heated by steam (injected fluid) of a liquid containing solids such as pulp raw material, the main fluid is supplied to the conduit 10 at the time of startup or automatically in the above-described predetermined order after supply. By opening the valve 21 and closing the automatic valve 21, which had been open until then, at the same time as the stop or in the reverse order from the start, the main fluid passes through the nozzle 21 and flows to the injection port ll side. Prevent backflow. Therefore, it is possible to prevent the nozzle from clogging due to the solid content of the main flow of the injection port 11 and the like.

(Comparative example) In order to solve the drawbacks of the conventional injector method, as shown in Figure 6, an in-line mixer using a static mixer was used to forcibly mix the main fluid and the injection fluid. Fluid mixing devices are also conceivable.

In the figure, 1 is a conduit through which the main fluid flows from left to right in the figure, and 2 is an inlet for introducing a steam pipe. The injection port 2 communicates with an outer tube 3 provided on the outer periphery of the conduit 1 so as to have a double tube structure, and this outer tube 3 communicates with the inner conduit 1.
The conduit 1 passes through a number of nozzle holes 30 formed on the outer periphery of the
Communicate with.

Inside the conduit 1, a plurality of static mixer elements 4 having twisted surfaces in the axial direction are continuously arranged from the left end 1a to the right end 1b in the figure.

However, in such a fluid mixing device, steam is injected into the conduit 1 at a place where the main fluid is hardly flowing, so that mixing in the center of the main fluid is incomplete and the jet noise from the nozzle hole is high. is generated as noise to the outside, and is not a sufficient solution to the problem.

(Effects of the Invention) According to the present invention, the nozzle is provided in a conduit as an inner tube of a double-pipe structure, and the injected fluid is injected into the conduit from a position where the tip thereof protrudes toward the axis side from the inner circumferential wall of the conduit. Since the jet is injected internally, the leakage of the jetting and condensation noise generated at that time to the outside can be significantly suppressed, and it is also possible to prevent a large amount of injected fluid such as steam from coming into contact with the slow-flowing main fluid at high speed. Even when the impact noise (hammering) occurs at that time, it is possible to reliably prevent the impact sound (hammering) that occurs at that time.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the configuration of an embodiment of the present invention, FIG. 2 is a view taken in the X direction of FIG. 1, and 3UA is the conduit 10 of FIG. 1.
A sectional view taken along the line A-A of the part, FIG. 4 is a half sectional view showing another embodiment, and FIGS.
FIG. 6 is a configuration diagram showing the opening and closing states of the automatic valve shown in FIG. 6, and FIG. 6 is a configuration sectional view of a comparative example. 10, , , , , , , conduit. 11, , , , , , , injection port. 12, , , , , , , , outer tube. 13 (13a-13d), nozzle. 15-20. ,,,,, Static mixer element cutting. 21 (21a to 21e), automatic valve. Applicant Noritake Co., Ltd. Agent
Patent Attorney Asa Kato Do Figure 1 Figure 8 Figure 2 Figure 3

Claims (1)

[Scope of Claims] l) A conduit through which the main fluid flows, a static mixer element 1 disposed inside the conduit in the axial direction, and a double pipe structure formed on the outer periphery of the conduit, for the injection fluid to flow through the conduit. A fluid mixing device comprising an outer tube having an injection port, and a nozzle that penetrates a conduit inside the outer tube and protrudes toward the axis of the conduit from the inner circumferential wall of the conduit. 2) A conduit through which the main fluid flows, a static mixer element disposed inside the conduit in the axial direction thereof, and an outer tube forming a double pipe structure on the outer periphery of the conduit and having an inlet for the injection wave body. , a fluid mixing device provided with a nozzle that penetrates the conduit inside the outer tube and protrudes toward the axis of the conduit from the inner circumferential wall of the conduit, and an automatic valve that opens and closes this nozzle based on an external signal.