CN222805068U - A steam mixing device and a reaction kettle - Google Patents

Abstract

The utility model discloses a steam mixing device and a reactor, which comprises a feed flange, a first mixing mechanism arranged below the feed flange, and a second mixing mechanism arranged below the first mixing mechanism; the feed flange is provided with a nozzle extending to the inside of the first mixing mechanism; the first mixing mechanism comprises a feed barrel arranged below the feed flange and a discharge barrel arranged below the feed barrel, the inner diameter of the discharge barrel is smaller than the inner diameter of the feed barrel; a plurality of feed holes of the same height are opened on the side wall of the feed barrel, the height of the feed holes is not lower than the height of the lower end of the nozzle; the second mixing mechanism comprises a feed chamber with an upper opening and a discharge chamber arranged below the feed chamber; the discharge barrel extends to the inside of the feed chamber. The utility model improves the steam heating efficiency, makes the material heating process stable, and can avoid the water hammer phenomenon caused by the direct impact of steam on the heating medium to the greatest extent.

Description

Steam mixing device and reaction kettle

Technical Field

The utility model relates to a steam mixing device and a reaction kettle, and belongs to the technical field of chemical industry and metallurgical equipment.

Background

In the chemical and metallurgical production process, steam needs to be directly introduced into the medium in some reaction kettles or tanks so as to achieve the purpose of heating or heat preservation. The traditional direct steam way is that a steam pipe is directly inserted into a kettle/tank, so that the defect caused by the way is that high-speed steam directly collides with a slowly flowing heated medium to easily cause serious water hammer phenomenon and cause excessive steam escape, so that the defects of abnormal vibration and large noise of a container, potential safety hazard in the operation of the container, low steam utilization rate and the like are caused. Some improved steam mixing devices comprising single stage pre-mix units have emerged in recent years. However, the premixing chamber in these devices has a limited space and length and a short premixing time, which makes the premixing of steam and material less than a set target.

Disclosure of utility model

The utility model aims to provide a steam mixing device and a reaction kettle, which are used for solving the technical problem that steam moving at a high speed can directly impact a low-speed flowing medium in a large space in the reaction kettle/a tank at a high speed during ventilation, avoiding the phenomenon of water hammer to the greatest extent, ensuring stable whole material heating process and improving the safety of a heating device and a bearing container.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

The steam mixing device comprises a feeding flange, a first mixing mechanism arranged below the feeding flange and a second mixing mechanism arranged below the first mixing mechanism, wherein a nozzle extending towards the inside of the first mixing mechanism is arranged on the feeding flange, the first mixing mechanism comprises a feeding cylinder arranged below the feeding flange and a discharging cylinder arranged below the feeding cylinder, the inner diameter of the discharging cylinder is smaller than that of the feeding cylinder, a plurality of feeding holes with the same height are formed in the side wall of the feeding cylinder, the height of the upper edge of each feeding hole is not lower than that of the lower end of the nozzle, the second mixing mechanism comprises a feeding chamber with an opening at the upper end and a discharging chamber arranged below the feeding chamber, and the discharging cylinder extends into the feeding chamber.

Therefore, the nozzle and the first mixing mechanism form a primary venturi structure, the discharging cylinder and the second mixing mechanism form a secondary venturi structure, high-speed steam enters the first mixing mechanism from the nozzle, the high-speed steam enters the feeding cylinder to generate a low-pressure area in the feeding cylinder, so that pressure difference is generated inside and outside the feeding cylinder, and a medium to be heated outside the feeding cylinder is sucked into the feeding cylinder from the feeding hole and is mixed with the steam in the feeding cylinder, thereby heating the medium; the heated medium enters the second mixing mechanism from the discharging barrel, at the moment, the medium in the discharging barrel is accelerated by the high-speed steam, the medium and the steam in the first mixing mechanism enter the second mixing mechanism together, so that a low-pressure area is generated in the feeding chamber of the second mixing mechanism, the medium to be heated is sucked into the second mixing mechanism from an opening at the upper end of the feeding chamber, the medium entering the second mixing structure in the heated first mixing mechanism is remixed with the newly sucked medium, the medium after secondary mixing is discharged from the discharging chamber of the second mixing structure, and the material heating process is stable, so that the phenomenon of water hammer caused by direct impact of the steam on the heated medium can be avoided to the greatest extent.

According to the embodiment of the utility model, the utility model can be further optimized, and the following technical scheme is formed after the optimization:

In order to make the medium and the steam mix more uniformly in the first mixing mechanism and to increase the speed of the steam entering the mixing mechanism, in a specific embodiment, the feeding cylinder and the discharging cylinder are communicated through a conical mixing part with a large upper part and a small lower part, and the nozzle comprises a conical part with a large upper part and a small lower part and a straight cylinder part arranged below the conical part.

In a specific embodiment, the nozzle and the discharging cylinder are coaxially arranged, the inner diameter of the discharging cylinder is larger than the inner diameter of the pipe at the lowest end of the nozzle, and the upper edge of the feeding hole is higher than the lowest end of the nozzle.

In order to increase the mixing effect in the second mixing mechanism, in a specific embodiment, the feeding chamber is in a conical shape with a large upper part and a small lower part, the lower end of the discharging cylinder extends to the middle position of the feeding chamber, a cylindrical mixing chamber is arranged between the feeding chamber and the discharging chamber, and the discharging chamber is in a conical structure with an opening gradually increasing downwards along the height direction of the second mixing mechanism.

The mixed medium is discharged from the discharge chamber of the second mixing mechanism, and the discharge end of the discharge chamber is in a flaring shape, so that the medium slowly flows and spreads, and the heating effect on the medium is increased.

In a specific embodiment, a plurality of rows of discharge holes distributed around the axis of the discharge chamber are formed in the side wall of the discharge chamber.

In a specific embodiment, the orientation of the discharge hole forms an angle θ with respect to the horizontal. The effect of medium discharge is more dispersed, so that the material heating process is stable.

In a specific embodiment, the discharging cylinder is fixedly connected with the feeding chamber through a plurality of connecting rib plates.

Based on the same inventive concept, the utility model also provides a reaction kettle, wherein the reaction kettle is provided with the steam mixing device.

Compared with the prior art, the steam mixing device and the reaction kettle have the beneficial effects that the steam heating efficiency is improved, the material heating process is stable, the water hammer phenomenon can be avoided to the greatest extent, and the heating effect on the material is improved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1 according to the present utility model.

In the drawings

1-Feeding flange, 2-nozzle, 21-conical part, 22-straight cylinder part, 3-first mixing mechanism, 31-feeding cylinder, 32-mixing part, 33-discharging cylinder, 34-feeding hole, 4-second mixing mechanism, 41-feeding chamber, 42-mixing chamber, 43-discharging chamber, 431-discharging hole and 5-connecting rib plate.

Detailed Description

The utility model will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. For convenience of description, the words "upper", "lower", "left" and "right" are used hereinafter to denote only the directions corresponding to the upper, lower, left, and right directions of the drawings, and do not limit the structure.

As shown in fig. 1, the steam mixing device of the embodiment comprises a feeding flange 1, a first mixing mechanism 3 arranged below the feeding flange 1 and a second mixing mechanism 4 arranged below the first mixing mechanism 3, wherein a nozzle 2 extending towards the inside of the first mixing mechanism 3 is arranged on the feeding flange 1, the feeding flange 1 and the nozzle 2 can be connected in a welding, thread and other modes, the nozzle 2 comprises a conical part 21 with a large upper part and a small lower part and a straight barrel part 22 arranged below the conical part 21, the first mixing mechanism 3 comprises a feeding barrel 31 arranged below the feeding flange 1 and a discharging barrel 33 arranged below the feeding barrel 31, the inner diameter of the discharging barrel 33 is smaller than the inner diameter of the feeding barrel 31, a conical mixing part 32 with a large upper part and a small lower part is arranged between the feeding barrel 31 and the discharging barrel 33, a plurality of feeding holes 34 with the same height are formed in the side wall of the feeding barrel 31, the height of the feeding holes 34 is not lower than the height of the nozzle 2, the inner diameter of the discharging barrel 33 is larger than the inner diameter of the nozzle 2, and the inner diameter of the discharging barrel 33 is larger than the inner diameter of the discharging barrel 33.

The nozzle 2 and the first mixing mechanism 3 form a primary venturi structure, a low-pressure area is formed in a flow area of high-speed steam sprayed into the first mixing mechanism 3 according to the action principle of the venturi structure, a medium to be heated outside the first mixing mechanism is sucked into the area from the feeding hole 34 to be premixed with steam once, and part of steam is condensed and the temperature of the heated medium is increased.

The second mixing mechanism 4 comprises a feeding chamber 41 with an opening at the upper end and a discharging chamber 43 arranged below the feeding chamber 41, the discharging barrel 33 extends into the feeding chamber 41, and the discharging barrel 33 is fixedly connected with the feeding chamber 41 through a plurality of connecting rib plates 5.

The feeding chamber 41 is in a conical shape with a large upper part and a small lower part, the lower end of the discharging barrel 33 extends to the middle part of the feeding chamber 41, a cylindrical mixing chamber 42 is arranged between the feeding chamber 41 and the discharging chamber 43, the discharging chamber 43 is in a conical structure with an opening gradually increasing downwards along the height direction of the second mixing mechanism 4, a plurality of rows of discharging holes 431 are formed in the side wall of the discharging chamber 43 along the axis of the discharging chamber 43, and the direction of the discharging holes 431 forms an included angle theta relative to the horizontal plane. The discharge hole 431 is arranged obliquely upward.

The embodiment also provides a reaction kettle, wherein the steam mixing device is arranged in the reaction kettle.

The steam mixing device is connected with a steam inlet pipe flange in a corresponding container through a steam inlet flange 1 before the steam mixing device is put into use, and the installation height of the whole steam mixing device is immersed below the liquid level of a heated medium in the container.

The utility model uses two-stage Venturi premixing effect to solve the problems of low heat transfer efficiency of the direct heating medium of steam and easy generation of water hammer sites. The steam entering the steam mixing device is continuously increased in flow rate to high-speed motion due to the shrinkage of the inner channel of the nozzle 2 and is injected into the first mixing mechanism cavity 3. According to the utility model, the nozzle 2 and the first mixing mechanism 3 form a primary venturi structure, a low-pressure area is formed in a flow area of high-speed steam sprayed into the first mixing mechanism 3 according to the action principle of the venturi structure, a heated medium outside the first mixing mechanism 3 is sucked into the area to be premixed with steam once, and partial steam is condensed and the temperature of the heated medium is increased. The mixture then enters a secondary venturi structure formed by a discharging barrel 33 and a second mixing mechanism 4, and is premixed for the second time with the sucked medium outside the cavity in the same way, and finally slowly flows into the container through the tail end of a conical discharging chamber 43 of the second mixing mechanism 4 and a discharging hole 431 on the conical wall, and further heats the material in the large space of the container. Due to the existence of the secondary premixing and outlet slow flow diffusion structure in the steam mixing device, the steam heating efficiency is improved, the material heating process is stable, and the water hammer phenomenon caused by direct impact of steam on a heating medium can be avoided to the greatest extent.

The foregoing examples are set forth in order to provide a more thorough description of the present utility model and are not intended to limit the scope of the utility model, and various modifications of the utility model, which are equivalent to those skilled in the art upon reading the present utility model, will fall within the scope of the utility model as defined in the appended claims.

Claims (9)

1. A steam mixing device is characterized by comprising a feeding flange (1), a first mixing mechanism (3) arranged below the feeding flange (1) and a second mixing mechanism (4) arranged below the first mixing mechanism (3), wherein the first mixing mechanism (3) comprises a feeding cylinder (31) arranged below the feeding flange (1) and a discharging cylinder (33) arranged below the feeding cylinder (31), the inner diameter of the discharging cylinder (33) is smaller than that of the feeding cylinder (31), a nozzle (2) extending towards the inside of the feeding cylinder (31) is arranged on the feeding flange (1), a plurality of feeding holes (34) with the same height are formed in the side wall of the feeding cylinder (31), the height of the upper edge of each feeding hole (34) is not lower than that of the lower end of each nozzle (2), the second mixing mechanism (4) comprises a feeding chamber (41) with an opening at the upper end and a discharging chamber (43) arranged below the feeding chamber (41), and the discharging chamber (43) extends to the inside of the feeding cylinder (41).

2. The steam mixing device according to claim 1, wherein the feed cylinder (31) and the discharge cylinder (33) are communicated with each other through a conical mixing part (32) with a large upper part and a small lower part.

3. The steam mixing device according to claim 1, wherein the nozzle (2) comprises a conical portion (21) with a large upper part and a small lower part and a straight cylindrical portion (22) arranged below the conical portion (21).

4. The steam mixing device according to claim 1, wherein the nozzle (2) is arranged coaxially with the discharge cylinder (33), and the inner diameter of the discharge cylinder (33) is larger than the inner diameter of the lowest pipe of the nozzle (2).

5. The steam mixing device according to claim 1, wherein the feeding chamber (41) is in a conical shape with a large upper part and a small lower part, the lower end of the discharging cylinder (33) extends to the middle position of the feeding chamber (41), a cylindrical mixing chamber (42) is arranged between the feeding chamber (41) and the discharging chamber (43), and the discharging chamber (43) is in a conical structure with an opening gradually increasing downwards along the height direction of the second mixing mechanism (4).

6. The steam mixing device according to claim 1, characterized in that a plurality of rows of discharge holes (431) distributed around the axis of the discharge chamber (43) are opened on the side wall of the discharge chamber (43).

7. The steam mixing device as claimed in claim 6, wherein the outlet opening (431) is oriented at an angle θ relative to the horizontal.

8. The steam mixing device according to claim 1, wherein the discharge cylinder (33) is fixedly connected with the feeding chamber (41) through a plurality of connecting rib plates (5).

9. A reaction kettle, wherein the steam mixing device as claimed in any one of claims 1 to 6 is arranged in the reaction kettle.