CN110465213B

CN110465213B - Gas cyclone mixer

Info

Publication number: CN110465213B
Application number: CN201810452272.3A
Authority: CN
Inventors: 薛倩; 王晓霖; 李遵照; 刘名瑞; 李雪; 赵巍
Original assignee: China Petroleum and Chemical Corp; Sinopec Dalian Research Institute of Petroleum and Petrochemicals
Current assignee: Sinopec Dalian Petrochemical Research Institute Co ltd; China Petroleum and Chemical Corp
Priority date: 2018-05-12
Filing date: 2018-05-12
Publication date: 2022-07-12
Anticipated expiration: 2038-05-12
Also published as: CN110465213A

Abstract

The invention relates to the field of gas mixing, in particular to a gas cyclone mixer. The gas cyclone mixer includes: the high-pressure gas enters tangentially at a certain speed, does high-speed spiral motion along the wall of the gas inlet cylinder and moves from top to bottom, and forms a rotary low-pressure area at the central shaft of the gas inlet cylinder in the spiral motion. The low-pressure gas is sent into the gas inlet cylinder from the bottom, the high-pressure gas in the spiral motion sucks the low-pressure gas into the gas inlet cylinder, and drives the low-pressure gas to shrink in the cylinder body of the gas inlet cylinder and flow to the center, and the low-pressure gas upwards forms a rising secondary internal vortex to enter a mixed gas through hole and further enter the mixing cylinder. The diameter of the mixing cylinder is smaller than the aperture of the mixed gas through hole, the air flow friction and collision in the high-pressure gas and the low-pressure gas at the reducing position are increased rapidly, local pressure loss is generated, and vortex turbulence is formed. By the method, the high-pressure gas is not required to be subjected to pressure reduction treatment in advance, and the high-pressure gas and the low-pressure gas are directly mixed.

Description

Gas cyclone mixer

Technical Field

The invention relates to the field of gas mixing, in particular to a gas cyclone mixer.

Background

In industrial processes or research and development experiments, gas mixers are generally used when mixing two or more gases. The existing gas mixer generally introduces two or more gases into a container at the same time, and mixes the gases by diffusion movement between the gases. The traditional gas mixing mode has the following defects: insufficient mixing uniformity, slow mixing speed, etc. The existing gas mixer only focuses on mixing radial gas, and rarely solves the problem of uneven proportion of axial gas. When different pressures are involved in mixing, the two gases must pass through a pressure reducing valve respectively, so that the two gases can be mixed after the pressures of the two gases are adjusted to be consistent. Therefore, the invention provides a novel gas mixer which can be mixed with low-pressure gas without decompressing high-pressure gas and simultaneously meets the requirement of uniformly mixing the gas in the axial direction and the radial direction of the pipeline.

Disclosure of Invention

Technical problem to be solved

It is an object of the present invention to provide a gas cyclone mixer that solves at least one of the above mentioned technical problems.

(II) technical scheme

In order to solve the above technical problems, the present invention provides a gas cyclone mixer, comprising: the air mixing device comprises an air inlet cylinder and a mixing cylinder, wherein a tangential high-pressure gas inlet is formed in the upper part of the side wall of the air inlet cylinder, and a low-pressure gas inlet is formed in the lower part of the side wall of the air inlet cylinder; the diameter of the air inlet cylinder is gradually enlarged from bottom to top, and a mixed gas through hole leading to the mixing cylinder is formed in the top of the air inlet cylinder; the cylinder diameter of the mixing cylinder is smaller than the mixed gas through hole, and a mixed gas outlet is formed in the top of the mixing cylinder.

In some embodiments, preferably, the gas cyclone mixer further comprises: and the low-pressure gas guide pipe extends into the air inlet cylinder from the low-pressure gas inlet.

In some embodiments, preferably, the inlet cylinder is a volute inlet formed by extending the side wall of the inlet cylinder outwards in a rotating manner at the high-pressure gas inlet.

In some embodiments, preferably, the intake cylinder includes: an inverted cone-shaped barrel and a volute; the upper edge of the inverted cone-shaped cylinder is connected with the bottom edge of the rotating shell of the volute in a splicing mode to form a closed cylinder.

In some embodiments, preferably, the intake cylinder further includes: the straight barrel, the back taper section of thick bamboo with pass through between the spiral case the straight barrel carries out the concatenation formula and connects to form the closed barrel.

In some embodiments, preferably, the high pressure gas inlet extends along the straight cylinder in a tangential direction thereto.

In some embodiments, preferably, the splicing connection manner includes: welding or flange connection.

In some embodiments, preferably, the mixing drum comprises: the premixing area is positioned at the lower part of the mixing cylinder and is communicated with the mixed gas through hole; the mixing area is positioned at the upper part of the mixing cylinder and is communicated with the mixed gas outlet.

In some embodiments, it is preferable that a plurality of spiral pipes are provided in the premixing zone, and the lower ends of the spiral pipes are communicated with the mixed gas through hole and the upper ends of the spiral pipes are communicated with the mixing zone.

In some embodiments, it is preferred that all of the spiral tubes have different diameters.

(III) advantageous effects

In the technical scheme provided by the invention, high-pressure gas enters tangentially at a certain speed, does high-speed spiral motion along the wall of the air inlet cylinder and moves from top to bottom, and a rotary low-pressure area at the central shaft of the air inlet cylinder is formed in the spiral motion. The low-pressure gas is sent into the gas inlet cylinder from the bottom, the high-pressure gas in the spiral motion sucks the low-pressure gas into the gas inlet cylinder, and drives the low-pressure gas to shrink in the cylinder body of the gas inlet cylinder and flow to the center, and the low-pressure gas upwards forms a rising secondary internal vortex to enter a mixed gas through hole and further enter the mixing cylinder. The diameter of the mixing cylinder is smaller than the diameter of the mixed gas through hole, the friction and collision of the high-pressure gas and the low-pressure gas at the reducing part are increased rapidly, local pressure loss is generated, and vortex turbulence is formed. In the mixing cylinder, the gas is mixed and then discharged from a mixed gas outlet. By the method, the high-pressure gas is not required to be subjected to pressure reduction treatment in advance, and the high-pressure gas and the low-pressure gas are directly mixed.

Drawings

FIG. 1 is a schematic diagram of a gas cyclone mixer according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view A-A of the gas cyclone of FIG. 1;

FIG. 3 is a top plan view of the pre-mix zone of FIG. 1;

FIG. 4 is a cross-sectional view of the pre-mix zone of FIG. 1.

Description of the labeling:

1-low-pressure gas inlet, 2-inverted cone, 3-straight cylinder, 4-high-pressure gas inlet, 5-low-pressure inlet guide pipe, 6-premixing chamber, 7-mixing chamber, 8-mixed gas outlet bent pipe, 9-mixed gas through hole, 10-spiral pipe, 11-spiral case and 12-high-pressure inlet guide spiral pipe.

Detailed Description

The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. "first", "second", "third" and "fourth" do not denote any sequence relationship, but are merely used for convenience of description. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. "Current" is the time when an action is performed, multiple occurrences of current in the text, all recorded in real time over time.

The invention provides a gas cyclone mixer based on the problems existing in the mixing of a plurality of gases.

Products, methods, and the like will be described in detail below with reference to basic designs, extended designs, and alternative designs.

The present invention provides a gas cyclone mixer, as shown in fig. 1 to 4, comprising: the air mixing device comprises an air inlet cylinder and a mixing cylinder, wherein a tangential high-pressure gas inlet 4 is formed in the upper part of the side wall of the air inlet cylinder, and a low-pressure gas inlet is formed in the lower part of the side wall of the air inlet cylinder; the cylinder diameter of the air inlet cylinder is gradually enlarged from bottom to top, and the top of the air inlet cylinder is provided with a mixed gas through hole 9 leading to the mixing cylinder; the diameter of the mixing cylinder is smaller than the aperture of the mixed gas through hole 9, and the top of the mixing cylinder is provided with a mixed gas outlet.

The high-pressure gas enters the air inlet cylinder from the tangential direction, a spiral flow curve can be formed in the air inlet cylinder, the spiral flow curve of the high-pressure gas rotates from top to bottom by means of the speed of the high-pressure gas, a state similar to tornado is formed, a low-pressure area is formed at the central shaft of the air inlet cylinder, upward driving force is formed on the low-pressure gas entering the lower portion, and the low-pressure gas is wrapped by the low-pressure gas to form second spiral force.

The cylinder diameter of the air inlet cylinder is gradually enlarged from bottom to top, after high-pressure air enters the air inlet cylinder, the air is enabled to rotate spirally along with the change of the cylinder diameter of the air inlet cylinder, and when the high-pressure air moves from top to bottom, the speed of the air is enabled to increase due to the change of the cylinder diameter, so that low-pressure air entering from the bottom is driven to mix and move upwards.

It is also mentioned here that the high-pressure gas enters the inlet barrel tangentially, and to this effect, some structural modifications may be made at the high-pressure gas inlet 4, and in some embodiments, it is suggested that the inlet barrel is designed as a volute structure at this location, the inlet of the volute 11 is the high-pressure gas inlet 4, and the housing of the volute 11 encloses the upper barrel wall of the inlet barrel. Namely, the inlet cylinder is a volute inlet (the inlet is a high-pressure inlet guide volute 12) formed by extending the side wall of the inlet cylinder outwards in a rotating way at the high-pressure gas inlet 4.

The diameter of the mixing cylinder is smaller than the diameter of the mixed gas through hole 9, so that high-pressure gas and low-pressure gas are reduced into the mixing cylinder from the mixed gas through hole 9, the friction and the collision of the gas in the reducing process can be rapidly increased, local pressure loss is generated, and vortex turbulence is formed. And the high-pressure gas and the low-pressure gas are fully mixed in the mixing cylinder and then are discharged from the mixed gas outlet. The mixed gas outlet conduit leads the mixed gas out of the mixed gas outlet in fig. 1. The mixed gas outlet conduit may employ an elbow 8.

The gas cyclone mixer further comprises: the low-pressure gas guide pipe extends into the air inlet cylinder from the low-pressure gas inlet. In order to introduce low-pressure gas into the air inlet cylinder as far as possible and convey the low-pressure gas to a preset position, the high-pressure gas adsorption belt can conveniently move upwards, and the upper end of the low-pressure gas guide pipe extends into the air inlet cylinder. The part of the low-pressure gas conduit extending into the air inlet cylinder is a straight pipe and is in the axial direction of the center of the air inlet cylinder.

Two structural forms of the air inlet cylinder are given as follows:

in a first form, an intake barrel comprising: an inverted conical barrel 2 and a volute 11; the upper edge of the inverted cone 2 is connected with the bottom edge of the rotating shell of the volute 11 in a splicing manner to form a closed cylinder. The housing of the volute 11 is coiled in a horizontal plane, i.e. the circular housing of the volute 11 constitutes the upper cylinder wall of the inlet cylinder. In order to avoid gas leakage, the upper edge of the inverted cone 2 and the lower edge of the shell of the volute 11 are spliced in a closed mode, and the joint is sealed.

Form two, the inlet section of thick bamboo includes: the device comprises an inverted cone 2, a straight cone 3 and a volute 11, wherein the inverted cone 2 and the volute 11 are connected in a splicing mode through the straight cone 3 to form a closed cylinder. Namely, the upper edge of the inverted cone 2 is in closed splicing with the lower edge of the straight cylinder 3, and the upper edge of the straight cylinder 3 is in closed splicing with the lower edge of the volute 11. The total length of the inverted cone 2 and the straight cylinder 3 should not be greater than the inherent swirl length, which is the linear distance from the lowest point of the vortex to the bottom end of the mixed gas outlet (elbow 8).

The closed splicing (namely splicing connection) in the first form and the second form can adopt welding or flange connection, and the joint of the two forms is sealed by a sealing gasket.

In the second form, the reverse tapered drum 2 and the straight drum 3 may be formed as an integral structure, or the straight drum 3 and the spiral casing 11 may be formed as an integral structure.

In the first form, the tangent of the high-pressure gas inlet 4 extends upward to the tangent of the high-pressure gas inlet 4 with the upper edge of the inverted cone 2. In the second form, the high-pressure gas inlet 4 extends upward along the straight tube 3 in a tangential direction thereto. In any case, the circumference of the upper edge of the reverse tapered barrel 2 is the same as the central axis of the cross-sectional circumference of the straight barrel 3.

Based on in above-mentioned various schemes, the mixing section of thick bamboo includes: the premixing area is positioned at the lower part of the mixing cylinder and is communicated with the mixed gas through hole 9; the mixing area is arranged at the upper part of the mixing cylinder and is communicated with the mixed gas outlet. The mixed gas through hole 9 is communicated with the premixing area, the space formed at the lower part of the mixing cylinder close to the premixing area by the mixed gas through hole 9 is a premixing chamber 6, and the diameter of the lower part of the mixing cylinder is smaller than that of the mixed gas through hole 9. And the space formed by the other end of the premixing area at the lower part of the mixing cylinder and the mixed gas outlet (elbow pipe 8) is a mixing chamber 7.

A plurality of spiral pipes 10 are arranged in the premixing chamber 6, outlets at two ends of the spiral pipes 10 are respectively positioned at two sides of the premixing chamber 6, and the outlet directions of the spiral pipes 10 are kept consistent. I.e. the lower end of the spiral tube 10 is in communication with the mixed gas through-hole 9 and the upper end is in communication with the mixing zone.

In some embodiments, the diameters of all of the volutes 10 are not equal. In the premixing area, the flow rates of the gas in the spiral pipes 10 with different pipe diameters arranged in the premixing area are different, the time for the gas flow to reach the post-mixing chamber 7 is different when the gas passes through the spiral pipes 10 with different pipe diameters, the mixing of the fluid along the axial direction of the pipeline is promoted, so that the gas can be uniformly mixed along the direction of the premixing chamber 6, and the mixed gas is discharged through the mixed gas outlet elbow pipe 8.

The working principle of the gas cyclone mixer of the invention in combination with figures 1, 2, 3 and 4 is as follows:

high-pressure gas enters the mixer through a high-pressure gas inlet 4 at a certain speed along the tangential direction of a volute 11 and performs high-speed spiral motion from top to bottom in a straight barrel 3 and an inverted cone-shaped barrel 2 of the mixer. And creates a rotating low pressure zone at the central axis of the mixer. The low-pressure gas enters the mixer from a low-pressure gas inlet 1 through a low-pressure inlet guide pipe 5, the low-pressure gas is absorbed and enters the mixer under the action of central low pressure generated by high-speed spiral in the mixer, the high-pressure gas which does spiral motion drives the low-pressure gas to contract and flow towards the center in the inverted cone-shaped cylinder 2, a rising secondary internal vortex is formed upwards and enters a mixed gas through hole 9, namely a premixing chamber, when the gas passes through a pipe diameter change part in the process of entering the premixing chamber 6 in the premixing chamber, the friction and collision of mass points of the gas are rapidly increased, local pressure loss is generated, and vortex turbulence is formed. The gas in the premixing chamber 6 passes through the spiral pipes 10 with different pipe diameters, so that the time for the gas to reach the back mixing chamber is different, and the mixing of the gas along the axial direction of the pipeline is promoted. The mixed gas is discharged through a mixed gas outlet elbow 8.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A gas cyclone mixer, comprising: the air mixing device comprises an air inlet cylinder and a mixing cylinder, wherein a tangential high-pressure gas inlet is formed in the upper part of the side wall of the air inlet cylinder, and a low-pressure gas inlet is formed in the lower part of the side wall of the air inlet cylinder; the diameter of the air inlet cylinder is gradually enlarged from bottom to top, and a mixed gas through hole leading to the mixing cylinder is formed in the top of the air inlet cylinder; the cylinder diameter of the mixing cylinder is smaller than the aperture of the mixed gas through hole, and the top of the mixing cylinder is provided with a mixed gas outlet;

the mixing drum comprises: the premixing area is positioned at the lower part of the mixing cylinder and communicated with the mixed gas through hole; the mixing area is positioned at the upper part of the mixing cylinder and is communicated with the mixed gas outlet;

a plurality of spiral pipes are arranged in the premixing area, the lower ends of the spiral pipes are communicated with the mixed gas through holes, and the upper ends of the spiral pipes are communicated with the mixing area;

the diameters of all the spiral pipes are different;

wherein the total length of the air inlet cylinder is not higher than the inherent rotational flow length which is the straight line distance from the lowest point of the vortex to the top of the mixing area.

2. The gas cyclone mixer of claim 1, further comprising: and the low-pressure gas guide pipe extends into the air inlet cylinder from the low-pressure gas inlet.

3. The gas cyclone mixer of claim 1, wherein the inlet barrel is a volute inlet formed by extending the sidewall of the inlet barrel in an outward rotating manner at the high-pressure gas inlet.

4. A gas cyclone mixer according to any of the claims 1-3, characterized in that the inlet cylinder comprises: an inverted conical barrel and a volute; the upper edge of the inverted cone-shaped cylinder is connected with the bottom edge of the rotating shell of the volute in a splicing mode to form a closed cylinder.

5. The gas cyclone mixer of claim 4, wherein the inlet barrel further comprises: the straight barrel, the back taper section of thick bamboo with pass through between the spiral case the straight barrel carries out the concatenation formula and connects to form the closed barrel.

6. The gas cyclone mixer of claim 5, wherein the high pressure gas inlet extends upward along the cylinder and is tangential to the inlet.

7. The gas cyclone mixer of claim 4, wherein the splicely connected connections comprise: welding or flange connection.