Steam mixing device and reaction kettle
By adopting a two-stage Venturi premix structure steam mixing device in chemical and metallurgical production, the water hammer phenomenon and low steam utilization caused by traditional direct steam are solved, and more efficient material heating and safer container operation are achieved.
Patent Information
- Application Number
- CN202420698477.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-07
- Publication Date
- 2025-04-29
- Estimated Expiration
- 2034-04-07
AI Technical Summary
The traditional direct steam method causes steam to directly impact the medium in chemical and metallurgical production, causing water hammer phenomenon, steam escape, container vibration and noise, and low steam utilization rate.
A steam mixing device with a two-stage Venturi pre-mixed structure is adopted. The steam is entered into the first mixing mechanism through the nozzle to form a low pressure zone, sucked in the medium to be heated for pre-mix, and then entered the second mixing mechanism for secondary pre-mix, and finally discharged through the slow-flow diffusion structure.
It effectively avoids the water hammer phenomenon caused by direct impact on the medium by steam, improves the steam heating efficiency and the stability of the material heating process, and improves the safety and steam utilization of the container.
Smart Images
Figure CN222805068U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a steam mixing device and a reaction kettle, belonging to the technical field of chemical and metallurgical equipment. Background Art
[0002] During chemical and metallurgical production processes, steam needs to be directly introduced into the media in some reactors or tanks to achieve the purpose of heating or heat preservation. The traditional direct steam method is to insert the steam pipe directly into the reactor / tank. The disadvantage of this method is that the high-speed steam directly collides with the slow-flowing heated medium, which can easily cause severe water hammer and lead to excessive steam escape, resulting in abnormal vibration and loud noise of the container, safety hazards in container operation, and low steam utilization. In recent years, some improved steam mixing devices containing single-stage premixing units have emerged. However, the premixing chamber space and length in these devices are limited, and the premixing time is short, so that the premixing effect of steam and material cannot achieve the set goal. Utility Model Content
[0003] The utility model aims to provide a steam mixing device and a reactor to solve the technical problem that high-speed steam during ventilation will directly impact the low-speed flowing medium in the large space of the reactor / tank at high speed. It can avoid the water hammer phenomenon to the greatest extent, ensure the stability of the entire material heating process, and improve the safety of the heating device and the carrying container.
[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:
[0005] A steam mixing device 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 toward the interior 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 being 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 upper edge of the feed hole being not lower than the height of the lower end of the nozzle; the second mixing mechanism comprises a feed chamber with an upper end opening and a discharge chamber arranged below the feed chamber; the discharge barrel extends to the interior of the feed chamber.
[0006] Therefore, in the present invention, the nozzle and the first mixing mechanism form a primary Venturi structure, and the discharge barrel and the second mixing mechanism form a secondary Venturi structure. High-speed steam enters the first mixing mechanism from the nozzle. After the high-speed steam enters the feed barrel, a low-pressure area will be generated in the feed barrel, resulting in a pressure difference between the inside and outside of the feed barrel. The medium to be heated outside the feed barrel will be sucked into the feed barrel from the feed hole and mixed with the steam in the feed barrel, thereby heating the medium; the heated medium enters the second mixing mechanism from the discharge barrel. At this time, the medium in the discharge barrel will be accelerated by the high-speed steam, and the medium and steam in the first mixing structure enter the second mixing mechanism together, causing a low-pressure area in the feed chamber of the second mixing structure, and the medium to be heated is sucked into the second mixing structure from the opening at the upper end of the feed chamber. The medium in the first mixing mechanism that has been heated and enters the second mixing structure is re-mixed with the newly inhaled medium, and the medium after secondary mixing is discharged from the discharge chamber of the second mixing structure, making the material heating process smooth and being able to avoid the water hammer phenomenon caused by direct impact of steam on the heating medium to the greatest extent.
[0007] According to the embodiments of the present invention, the present invention can be further optimized. The following is the technical solution formed after optimization:
[0008] In order to make the medium and steam mix more evenly in the first mixing mechanism and at the same time speed up the speed of steam entering the mixing mechanism, in a specific embodiment, the feed cylinder and the discharge cylinder are connected through a conical mixing section with a larger upper part and a smaller lower part; the nozzle includes a conical section with a larger upper part and a smaller lower part and a straight cylindrical section arranged below the conical section.
[0009] In a specific embodiment, the nozzle and the discharge barrel are coaxially arranged; the inner diameter of the discharge barrel is larger than the inner diameter of the lowermost end of the nozzle; and the upper edge of the feed hole is higher than the lowermost end of the nozzle.
[0010] In order to increase the mixing effect in the second mixing mechanism, in a specific embodiment, the feed chamber is conical in shape, larger at the top and smaller at the bottom, and the lower end of the discharge cylinder extends to the middle position of the feed chamber; a cylindrical mixing chamber is provided between the feed chamber and the discharge chamber; the discharge chamber is a conical structure whose opening gradually increases downward along the height direction of the second mixing mechanism.
[0011] The mixed medium is discharged from the discharge chamber of the second mixing mechanism. The discharge end of the discharge chamber is in an expanded shape, which allows the medium to flow slowly and diffuse, while also increasing the heating effect on the medium.
[0012] In a specific embodiment, a plurality of discharge holes distributed around the axis of the discharge chamber are opened on the side wall of the discharge chamber.
[0013] In a specific embodiment, the direction of the discharge hole forms an angle θ relative to the horizontal plane, so that the medium discharge effect is more dispersed, making the material heating process smooth.
[0014] In a specific embodiment, the discharge barrel and the feed chamber are fixedly connected via a plurality of connecting ribs.
[0015] Based on the same inventive concept, the present invention also provides a reactor, in which the steam mixing device as described above is provided.
[0016] Compared with the prior art, the beneficial effects of the present invention are: the steam mixing device and reactor of the present invention improve the steam heating efficiency, 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. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the utility model;
[0018] Figure 2 This utility model Figure 1 AA cross-sectional structure diagram.
[0019] In the figure
[0020] 1-feed flange; 2-nozzle; 21-conical part; 22-straight part; 3-first mixing mechanism; 31-feed barrel; 32-mixing part; 33-discharge barrel; 34-feed hole; 4-second mixing mechanism; 41-feed chamber; 42-mixing chamber; 43-discharge chamber; 431-discharge hole; 5-connecting rib plate. DETAILED DESCRIPTION
[0021] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. It should be noted that the embodiments and features of the embodiments of the present invention may be combined unless they conflict. For ease of description, the words "upper," "lower," "left," and "right" appear below merely to indicate the directions of upper, lower, left, and right in the accompanying drawings and do not limit the structure.
[0022] like Figure 1As shown, the steam mixing device of this embodiment includes a feed flange 1, a first mixing mechanism 3 arranged below the feed flange 1, and a second mixing mechanism 4 arranged below the first mixing mechanism 3; the feed flange 1 is provided with a nozzle 2 extending toward the interior of the first mixing mechanism 3; the steam feed flange 1 and the nozzle 2 can be connected by welding, threading, etc.; the nozzle 2 includes a tapered portion 21 with a larger upper portion and a smaller lower portion and a straight cylindrical portion 22 arranged below the tapered portion 21; the first mixing mechanism 3 includes a nozzle 2 arranged on the feed flange 1 and a second mixing mechanism 4 arranged below ...4; the first mixing mechanism 3 includes a The feed cylinder 31 below the flange 1 and the discharge cylinder 33 arranged below the feed cylinder 31, the inner diameter of the discharge cylinder 33 is smaller than the inner diameter of the feed cylinder 31; a conical mixing section 32 with a larger upper part and a smaller lower part is provided between the feed cylinder 31 and the discharge cylinder 33, and a plurality of feed holes 34 of the same height are opened on the side wall of the feed cylinder 31, and the height of the feed hole 34 is not lower than the height of the lower end of the nozzle 2; the nozzle 2 and the discharge cylinder 33 are coaxially arranged; the inner diameter of the discharge cylinder 33 is larger than the inner diameter of the lower end tube of the nozzle 2.
[0023] The nozzle 2 and the first mixing mechanism 3 form a primary Venturi structure. According to the working principle of the Venturi structure, the flow area of the high-speed steam injected into the first mixing mechanism 3 forms a low-pressure area. The medium to be heated outside the first mixing mechanism is sucked into this area through the feed hole 34 to be pre-mixed with the steam. Part of the steam condenses and causes the temperature of the heated medium to increase.
[0024] The second mixing mechanism 4 includes a feed chamber 41 with an upper opening and a discharge chamber 43 arranged below the feed chamber 41; the discharge barrel 33 extends into the interior of the feed chamber 41; the discharge barrel 33 and the feed chamber 41 are fixedly connected by a plurality of connecting ribs 5.
[0025] The feed chamber 41 is tapered, with a larger top and smaller bottom. The lower end of the discharge barrel 33 extends to the center of the feed chamber 41. A cylindrical mixing chamber 42 is disposed between the feed chamber 41 and the discharge chamber 43. The discharge chamber 43 is a tapered structure with its opening gradually increasing downward along the height of the second mixing mechanism 4. Several discharge holes 431 are formed in the sidewalls of the discharge chamber 43 along its axis. These holes 431 are oriented at an angle θ relative to the horizontal plane. The discharge holes 431 are arranged obliquely upward.
[0026] This embodiment further provides a reactor, in which the steam mixing device as described above is provided.
[0027] The steam mixing device of the present invention is connected to the steam inlet pipe flange in the corresponding container through the steam inlet flange 1 before being put into use. The installation height of the entire steam mixing device should be immersed below the liquid level of the heated medium in the container.
[0028] The present invention utilizes a two-stage Venturi premixing effect to address the low heat transfer efficiency and water hammer issues associated with direct steam heating. The steam entering the steam mixing device is continuously accelerated to a high velocity due to the reduced diameter of the inner passage of the nozzle 2, and is then ejected into the first mixing mechanism chamber 3. In the present invention, the nozzle 2 and the first mixing mechanism 3 form a primary Venturi structure. According to the principle of the Venturi structure, the flow area of the high-speed steam injected into the first mixing mechanism 3 forms a low-pressure zone. The heated medium outside the first mixing mechanism 3 is drawn into this area for a premixing with the steam, causing some of the steam to condense and raise the temperature of the heated medium. This mixture then enters the secondary Venturi structure comprised of the discharge barrel 33 and the second mixing mechanism 4, undergoing a secondary premixing with the inhaled medium outside the chamber. Finally, it slowly flows into the container through the end of the tapered discharge chamber 43 of the second mixing mechanism 4 and the discharge hole 431 on the tapered wall, further heating the material within the large container space. Due to the existence of secondary pre-mixing and outlet slow-flow diffusion structure in the steam mixing device, the steam heating efficiency is improved, the material heating process is made smooth, and the water hammer phenomenon caused by direct steam impact on the heating medium can be avoided to the greatest extent.
[0029] The contents described in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent modifications to the present invention made by those skilled in the art fall within the scope defined by the claims attached to this application.
Claims
1. A steam mixing device, characterized in that: The invention comprises a feed flange (1), a first mixing mechanism (3) arranged below the feed flange (1), and a second mixing mechanism (4) arranged below the first mixing mechanism (3); the first mixing mechanism (3) comprises a feed barrel (31) arranged below the feed flange (1) and a discharge barrel (33) arranged below the feed barrel (31), the inner diameter of the discharge barrel (33) being smaller than the inner diameter of the feed barrel (31); the feed flange (1) is provided with a nozzle (2) extending toward the inside of the feed barrel (31); a plurality of feed holes (34) of the same height are opened on the side wall of the feed barrel (31), the height of the upper edge of the feed hole (34) being not lower than the height of the lower end of the nozzle (2); the second mixing mechanism (4) comprises a feed chamber (41) with an opening at the upper end and a discharge chamber (43) arranged below the feed chamber (41); the discharge barrel (33) extends into the inside of the feed chamber (41).
2. The steam mixing device according to claim 1, characterized in that: The feed cylinder (31) and the discharge cylinder (33) are connected via a conical mixing portion (32) that is larger at the top and smaller at the bottom.
3. The steam mixing device according to claim 1, characterized in that: The nozzle (2) comprises a tapered portion (21) which is larger at the top and smaller at the bottom, and a straight cylindrical portion (22) arranged below the tapered portion (21).
4. The steam mixing device according to claim 1, characterized in that: The nozzle (2) and the discharge barrel (33) are coaxially arranged; the inner diameter of the discharge barrel (33) is larger than the inner diameter of the lowermost tube of the nozzle (2).
5. The steam mixing device according to claim 1, characterized in that: The feed chamber (41) is in the shape of a cone that is larger at the top and smaller at the bottom, and the lower end of the discharge barrel (33) extends to the middle of the feed chamber (41); a cylindrical mixing chamber (42) is provided between the feed chamber (41) and the discharge chamber (43); and the discharge chamber (43) is a cone-shaped structure whose opening gradually increases downward 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 discharge holes (431) distributed around the axis of the discharge chamber (43) are provided on the side wall of the discharge chamber (43).
7. The steam mixing device according to claim 6, characterized in that: The direction of the discharge hole (431) forms an angle θ with respect to the horizontal plane.
8. The steam mixing device according to claim 1, characterized in that: The discharge barrel (33) and the feed chamber (41) are fixedly connected via a plurality of connecting ribs (5).
9. A reaction kettle, characterized in that: The reactor is provided with a steam mixing device as described in any one of claims 1 to 6.