Laval nozzle type mixing device

Abstract

The utility model discloses a Laval nozzle type mixing device, which belongs to the technical field of gas mixing devices and comprises a steam inlet pipe, an oxygen inlet pipe, a mixing pipe and an outer cylinder. One end of the oxygen inlet pipe is communicated with one end of the steam inlet pipe, the steam inlet pipe is used for introducing high-pressure steam, the other end of the oxygen inlet pipe is communicated with one end of the mixing pipe, the oxygen inlet pipe is sleeved with the outer cylinder, an oxygen inlet is formed in the outer cylinder, a plurality of through holes are formed in the oxygen inlet pipe, and the through holes are communicated with the mixing pipe. The multiple through holes are arranged in an array mode in the circumferential direction of the outer surface of the oxygen inlet pipe. The gas mixing device has the advantages that gas mixing is more thorough, secondary mixing can be achieved, and a pressure reducing valve does not need to be installed.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas mixing devices, and more specifically relates to a Laval nozzle type mixing device. Background Art

[0002] In the gasification process involving oxygen steam as a gasifier, the mixture of oxygen and steam allows the gasifier to enter the gasifier through only one flow channel. At the same time, oxygen and steam can be mixed well, increasing the temperature of oxygen and the gas flow rate entering the gasifier, and the coal powder particles are quickly gasified. In this chemical process, the mixing degree of the mixed gas in this seemingly simple gas mixing equipment directly affects the gasification efficiency, and is sometimes the core issue and key technology, which ultimately affects the performance of the entire equipment.

[0003] Traditional oxygen steam mixers generally use stationary "turbulators" installed in pipelines or equipment to disrupt and divide the airflow multiple times to achieve the mixing effect, or use mechanical stirring to participate in the mixing.

[0004] Although the above structure is simple, the overall mixing effect is poor, which sometimes increases the system resistance, affects the gasification effect, and affects the safe and stable operation of the system.

[0005] Therefore, how to provide a Laval nozzle mixing device is a problem that those skilled in the art need to solve urgently. Utility Model Content

[0006] In view of this, the utility model provides a Laval nozzle type mixing device, which has the advantages of more thorough gas mixing, capable of achieving secondary mixing, and no need to install a pressure reducing valve.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] A Laval nozzle type mixing device comprises: a steam inlet pipe, an oxygen inlet pipe, a mixing pipe and an outer tube; one end of the oxygen inlet pipe is connected with one end of the steam inlet pipe, the steam inlet pipe is used to introduce high-pressure steam, the other end of the oxygen inlet pipe is connected with one end of the mixing pipe, the outer tube is sleeved on the outside of the oxygen inlet pipe, the outer tube is provided with an oxygen inlet port, the oxygen inlet pipe is provided with a plurality of through holes, and the plurality of through holes are arranged in an array along the circumferential direction of the outer surface of the oxygen inlet pipe.

[0009] Furthermore, the steam inlet pipe and the mixing pipe are both tapered pipes, and the end of the steam inlet pipe connected to the oxygen inlet pipe and the end of the mixing pipe connected to the oxygen inlet pipe are both ends with the smallest radius.

[0010] Furthermore, a baffle is installed inside the mixing tube, and the baffle is in an arc shape.

[0011] Furthermore, a drain port is provided on one side of the outer cylinder, and a sealing bolt is threadedly connected to the drain port.

[0012] The beneficial effects of the utility model are:

[0013] 1. The utility model adopts the negative pressure adsorption principle of Laval nozzle. Oxygen is sucked in by negative pressure at the oxygen inlet pipe, and the relative speed is used to make the steam and oxygen collide, so that the mixing is more ideal and thorough.

[0014] 2. Two unequal pressure gases can be evenly mixed without installing a pressure reducing valve. After the high-pressure steam enters the oxygen inlet pipe, the flow rate increases, forming an instantaneous vacuum. There is no need to install a pressure reducing valve, and the low-pressure oxygen can be inhaled by negative pressure.

[0015] 3. The baffle spoiler technology is used to make the mixing more ideal. The arc baffle is installed inside the mixing tube to achieve secondary mixing and make the gas mixing more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0017] Figure 1 It is a structural schematic diagram of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the cross section of the oxygen intake pipe of the utility model.

[0019] Among them, in the figure:

[0020] 1-steam inlet pipe; 2-oxygen inlet pipe; 3-mixing tube; 4-outer cylinder; 5-oxygen inlet port; 6-through hole; 7-baffle; 8-sealing bolt. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] Please see attached Figure 1-2 The utility model provides a Laval nozzle mixing device, comprising: a steam intake pipe 1, an oxygen intake pipe 2, a mixing pipe 3 and an outer tube 4; one end of the oxygen intake pipe 2 is connected with one end of the steam intake pipe 1, the steam intake pipe 1 is used to introduce high-pressure steam, the other end of the oxygen intake pipe 2 is connected with one end of the mixing pipe 3, the outer tube 4 is sleeved on the outside of the oxygen intake pipe 2, the outer tube 4 is provided with an oxygen intake port 5, the oxygen intake pipe 2 is provided with a plurality of through holes 6, and the plurality of through holes 6 are arranged in an array along the circumferential direction of the outer surface of the oxygen intake pipe 2.

[0023] The steam inlet pipe 1 and the mixing pipe 3 are both tapered pipes, and the end of the steam inlet pipe 1 connected to the oxygen inlet pipe 2 and the end of the mixing pipe 3 connected to the oxygen inlet pipe 2 are both the ends with the smallest radius. High-pressure steam enters from the side with a larger diameter of the steam inlet pipe 1. As the diameter of the steam inlet pipe 1 gradually decreases, the steam flow rate increases and reaches a maximum value after passing through the oxygen inlet pipe 2.

[0024] The mixing tube 3 is provided with a baffle 7, and the baffle 7 is in an arc shape. The baffle 7 can extend the flow distance of the mixed gas in the mixing tube 3, and the arc-shaped baffle 7 can make the mixed gas form a vortex, further improving the gas mixing effect.

[0025] A drain port is provided on one side of the outer cylinder 4, and a sealing bolt 8 is threadedly connected to the drain port. After the utility model device is used for a period of time, the sealing bolt 8 can be removed and the accumulated water at the bottom of the outer cylinder 4 can be discharged through the drain port.

[0026] The utility model has a simple structure and is easy to use. Water vapor with a certain pressure enters through the side with a larger diameter of the steam intake pipe 1, and can reach the speed of sound when flowing to the oxygen intake pipe 2. When it reaches the diffusion part of the oxygen intake pipe 2, the static pressure is converted into kinetic energy, reaching supersonic speed. At the same time, a vacuum is formed at the oxygen intake pipe 2, and oxygen enters at this position. Under the action of the pressure difference, the oxygen is sucked into the oxygen intake pipe 2 by the negative pressure and mixed with the supersonic steam while entering the mixing pipe 3 (there is a relative speed and collision mixing with the steam), completing the first mixing. The mixed gas has sufficient penetrating power to form a mixed layer. In the mixing pipe 3, the mixed gas is fully mixed by entraining and entraining the surrounding gas to complete the second mixing, and then it is ejected from one end of the mixing pipe 3 at a subsonic speed. At the same time, the speed of the mixed gas is reduced and the pressure is increased; thereby, the utility model has the advantages of more thorough gas mixing, secondary mixing can be achieved, and there is no need to install a pressure reducing valve.

[0027] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0028] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A Laval nozzle mixing device, characterized in that: include: A steam intake pipe (1), an oxygen intake pipe (2), a mixing pipe (3) and an outer tube (4); one end of the oxygen intake pipe (2) is connected to one end of the steam intake pipe (1), the steam intake pipe (1) is used to introduce high-pressure steam, the other end of the oxygen intake pipe (2) is connected to one end of the mixing pipe (3), the outer tube (4) is sleeved on the outside of the oxygen intake pipe (2), the outer tube (4) is provided with an oxygen intake port (5), the oxygen intake pipe (2) is provided with a plurality of through holes (6), and the plurality of through holes (6) are arranged in an array along the circumferential direction of the outer surface of the oxygen intake pipe (2).

2. A Laval nozzle type mixing device according to claim 1, characterized in that: The steam inlet pipe (1) and the mixing pipe (3) are both tapered pipes, and the end of the steam inlet pipe (1) connected to the oxygen inlet pipe (2) and the end of the mixing pipe (3) connected to the oxygen inlet pipe (2) are both ends with the smallest radius.

3. A Laval nozzle type mixing device according to claim 1, characterized in that: A baffle (7) is installed inside the mixing tube (3), and the baffle (7) is in an arc shape.

4. A Laval nozzle type mixing device according to claim 1, characterized in that: A drain port is provided on one side of the outer cylinder (4), and a sealing bolt (8) is threadedly connected to the drain port.

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