Venturi multistage gas-liquid mixer with parallel jet nozzles

Abstract

The utility model discloses a venturi multistage gas-liquid mixer with parallel jet nozzles, which comprises a liquid inlet pipe, an air suction chamber, a venturi pipe contraction pipe section, a venturi pipe throat pipe section and a venturi pipe diffusion pipe section which are connected in sequence, and a plurality of air inlet pipes are uniformly arranged on the same circumference of the outer side wall of the air suction chamber; seven liquid inlet jet spray pipes are arranged in the air suction chamber, and inlets of the seven liquid inlet jet spray pipes are jointly connected with a liquid inlet pipe. According to the utility model, the problem that gas and liquid cannot be fully mixed into a uniform phase due to low quality of generated bubble groups in the prior art is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fluid mechanical equipment and relates to a Venturi multi-stage gas-liquid mixer with parallel jet nozzles. Background Art

[0002] As the core equipment of the oil and gas mixed transportation system, the gas-liquid mixed transportation pump is very important to improve the efficiency and operation stability of the gas-liquid mixed transportation pump in oil and gas transportation. Among the series of factors affecting the operation stability of the gas-liquid mixed transportation pump, uniform inlet conditions are particularly important. Non-uniform inlet conditions will cause violent vibration and cavitation of the mixed transportation pump, thereby greatly reducing the working efficiency of the gas-liquid mixed transportation pump.

[0003] In order to make the inlet of the gas-liquid mixed transmission pump a uniform gas-liquid two-phase transmission medium, a gas-liquid mixer must be introduced to fully mix the gas and liquid into a uniform phase.

[0004] Currently, most existing gas-liquid mixers use ejectors or venturi tubes. The principle of an ejector is that the liquid velocity increases at the nozzle, causing the gas entering through the ejector inlet to mix and collide with the jet liquid, breaking large bubbles into small bubble clusters by the high-velocity liquid. A venturi tube gas-liquid mixer, on the other hand, initially mixes and disperses the gas and liquid phases, then undergoes intense turbulent hydraulic shear at the convergence, throat, and divergence sections of the venturi tube structure to generate bubble clusters.

[0005] However, so far, the proportion of fine bubbles generated by existing instruments in the bubble group is not particularly ideal, which results in the inability to fully mix the gas and liquid into a uniform phase. Utility Model Content

[0006] The utility model aims to provide a Venturi multi-stage gas-liquid mixer with parallel jet nozzles, which solves the problem in the prior art that the quality of the generated bubble group is low, resulting in the inability of gas and liquid to be fully mixed into a uniform phase.

[0007] The technical solution adopted by the utility model is a Venturi multi-stage gas-liquid mixer with parallel jet nozzles, which includes a liquid inlet pipe, an air suction chamber, a Venturi tube contraction pipe section, a Venturi tube throat section and a Venturi tube diffusion pipe section connected in sequence, a plurality of air inlet pipes are evenly arranged on the same circumference of the outer wall of the air suction chamber, seven liquid inlet jet nozzles are arranged in the air suction chamber, and the inlets of the seven liquid inlet jet nozzles are commonly connected to the liquid inlet pipe.

[0008] The utility model is also characterized in that:

[0009] Four air inlet pipes are evenly arranged on the outer side wall of the air suction chamber.

[0010] One of the seven liquid inlet jet nozzles is a central nozzle, the axis of the central nozzle coincides with the axis of the liquid inlet pipe, and the axes of the remaining six liquid inlet jet nozzles are parallel to each other and are evenly distributed around the axis of the central nozzle at an interval of 60°. The circle with the axis of the central nozzle as the center and passing through the center of the remaining six liquid inlet jet nozzles is a concentric circle of the flow section of the liquid inlet pipe.

[0011] The outlet positions of the seven liquid inlet jet nozzles are in the same plane as the air inlet pipe.

[0012] The diameter D2 of the liquid inlet jet nozzle is 1 / 5 of the diameter D1 of the liquid inlet pipe.

[0013] The outlet diameter of the liquid inlet jet nozzle is 1 / 5 of the diameter of the liquid inlet port of the liquid inlet jet nozzle.

[0014] The length of the contraction section of the venturi tube is 1 / 2 of the length of the diffusion section of the venturi tube.

[0015] The diameter of the throat section of the Venturi tube is 1 / 8 of the outlet diameter of the diffuser section of the Venturi tube.

[0016] The diameter of the liquid inlet pipe is 40 cm, the diameter of the liquid inlet of the liquid jet nozzle 2 is 10 cm, and the length is L 21 The diameter of the liquid inlet jet nozzle is 20 cm, and the nozzle is connected to the liquid inlet jet nozzle. The nozzle outlet diameter is 2 cm and the nozzle length is 10 cm. The air inlet pipe diameter is 5 cm and the length is 20 cm. The suction chamber diameter is 40 cm and the length is 60 cm. The inlet diameter of the venturi tube contraction section is 40 cm and the length is 30 cm. The diameter of the venturi tube throat section is 5 cm and the length is 8 cm. The outlet diameter of the venturi tube diffusion section is 40 cm and the length is 60 cm.

[0017] The beneficial effects of the utility model are:

[0018] In the utility model, the continuous water phase and the continuous gas phase enter the first-level water inlet pipe section and the air inlet pipe section, the flow velocity of the liquid increases after passing through the liquid inlet jet nozzle, the jet liquid collides with the gas entering the suction chamber, and the large bubbles are sheared and impacted by the high-speed liquid and broken into dispersed bubbles. Secondly, the gas-liquid two-phase flow passes through the contraction pipe section, throat section and diffusion pipe section of the secondary venturi tube structure, and the strong turbulent hydraulic shear force further breaks up the dispersed bubbles to generate higher quality, that is, a bubble group with a higher proportion of fine bubbles, thereby achieving the uniform inflow condition required by the mixed pump, effectively suppressing the vibration of the mixed pump, reducing the cavitation wear of the mixed pump, and further improving the operating stability and efficiency of the gas-liquid mixed pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a Venturi multi-stage gas-liquid mixer with parallel jet nozzles according to the present invention;

[0020] Figure 2This is a schematic diagram of the arrangement structure of the air inlet pipe in the Venturi multi-stage gas-liquid mixer with parallel jet nozzles of the utility model;

[0021] Figure 3 The utility model is a schematic diagram of the arrangement structure of the liquid inlet jet nozzles in the Venturi multi-stage gas-liquid mixer with parallel jet nozzles.

[0022] In the figure: 1. liquid inlet pipe, 2. liquid inlet jet nozzle, 3. air inlet pipe, 4. suction chamber, 5. venturi tube contraction section, 6. venturi tube throat section, 7. venturi tube diffusion section. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and specific implementation methods.

[0024] Example 1

[0025] The utility model has a Venturi multi-stage gas-liquid mixer with parallel jet nozzles, and its structure is as follows Figure 1 As shown, it includes a liquid inlet pipe 1, an air suction chamber 4, a venturi tube contraction section 5, a venturi tube throat section 6 and a venturi tube diffusion section 7 connected in sequence. A plurality of air inlet pipes 3 are evenly arranged on the same circumference of the outer wall of the air suction chamber 4. Seven liquid inlet jet nozzles 2 are arranged in the air suction chamber 4. The inlets of the seven liquid inlet jet nozzles 2 are commonly connected to the liquid inlet pipe 1. The other end of the venturi tube diffusion section 7 is fixedly and tightly connected to the inlet of the gas-liquid mixed transfer pump for use.

[0026] Four air inlet pipes 3 are evenly arranged on the outer wall of the air intake chamber 4.

[0027] One of the seven liquid inlet jet nozzles 2 is a central nozzle, the axis of the central nozzle coincides with the axis of the liquid inlet pipe 1, and the axes of the remaining six liquid inlet jet nozzles 2 are parallel to each other and are evenly distributed around the axis of the central nozzle at an interval of 60°. The circle with the axis of the central nozzle as the center and passing through the center of the remaining six liquid inlet jet nozzles 2 is a concentric circle of the flow section of the liquid inlet pipe 1.

[0028] The outlet positions of the seven liquid inlet jet nozzles 2 and the air inlet pipe 3 are in the same plane.

[0029] The working principle of this utility model is:

[0030] During operation, the continuous water phase and the continuous gas phase first enter the first-level water inlet pipe section 1 and the air inlet pipe section 3. The liquid velocity increases after passing through the liquid inlet jet nozzle 2. At the same time, the gas passing through the air inlet pipe 3 enters the suction chamber 4. The jet liquid collides with the gas in the suction chamber 4, and the large bubbles are broken into dispersed bubbles by the shear force and impact of the high-speed liquid. Secondly, the dispersed bubbles with a certain degree of fragmentation pass through the secondary bubble fragmentation structure, namely the Venturi tube contraction section 5, the Venturi tube throat section 6, and the Venturi tube diffuser section 7. The strong turbulent hydraulic shear force further fragments the dispersed bubbles into higher-quality bubble groups (i.e., a higher proportion of fine bubbles), thereby achieving the uniform inflow conditions required by the mixed flow pump. By inputting more uniform inlet conditions, the vibration of the mixed flow pump is suppressed, the cavitation wear of the mixed flow pump is reduced, and the operating stability and efficiency of the gas-liquid mixed flow pump are further improved.

[0031] Example 2

[0032] This embodiment has a Venturi multi-stage gas-liquid mixer with parallel jet nozzles, and its structure is as follows Figure 1 As shown, it includes a liquid inlet pipe 1, an air suction chamber 4, a venturi tube contraction section 5, a venturi tube throat section 6 and a venturi tube diffusion section 7 connected in sequence. A plurality of air inlet pipes 3 are evenly arranged on the same circumference of the outer wall of the air suction chamber 4. Seven liquid inlet jet nozzles 2 are arranged in the air suction chamber 4. The inlets of the seven liquid inlet jet nozzles 2 are connected to the liquid inlet pipe 1. The other end of the venturi tube diffusion section 7 is fixedly and tightly connected to the inlet of the gas-liquid mixed transfer pump for use; as shown Figure 2 As shown, four air inlet pipes 3 are evenly arranged around the outer wall of the suction chamber 4. One of the seven liquid inlet jet nozzles 2 is a central nozzle, the axis of which coincides with the axis of the liquid inlet pipe 1. The axes of the remaining six liquid inlet jet nozzles 2 are parallel to each other and evenly distributed around the central nozzle at 60° intervals. The circles centered on the central nozzle axis and passing through the centers of the remaining six liquid inlet jet nozzles 2 are concentric circles with the flow cross-section of the liquid inlet pipe 1. The outlets of the seven liquid inlet jet nozzles 2 are coplanar with the air inlet pipe 3. The diameter D2 of the liquid inlet jet nozzles 2 is 1 / 5 of the diameter D1 of the liquid inlet pipe 1. The outlet diameter of the liquid inlet jet nozzle 2 is 1 / 5 of the diameter of the liquid inlet port of the liquid inlet jet nozzle 2. The length of the venturi converging section 5 is 1 / 2 of the length of the venturi diverging section 7. The diameter of the venturi throat section 6 is 1 / 8 of the outlet diameter of the venturi diverging section 7.

[0033] The gradually decreasing ratio of the inlet and outlet diameters at different locations can better enhance the degree of gas-liquid dispersion and mixing, the proportion of fine bubbles, and the uniformity of bubble size distribution. The Venturi diffuser section is the primary area where bubbles are sheared by the intense turbulence of the liquid. The length ratio of the Venturi tube's contracting section (5) to the Venturi tube's diffuser section (1:2) ensures a compact structure while maximizing the probability of bubble collision in the longer diffuser section, thereby mixing with the liquid and producing a higher-quality, uniform medium.

[0034] Example 3

[0035] Based on Example 2, the inlet diameter D5 of the Venturi tube contraction section 5 is 40 cm and the length L5 is 30 cm, the diameter D6 of the Venturi tube throat section 6 is 5 cm and the length L6 is 8 cm, and the outlet diameter D7 of the Venturi tube diffusion section 7 is 40 cm and the length L7 is 60 cm.

[0036] The diameter D3 of the air intake pipe is 5 cm and the length L3 is 20 cm. The diameter D4 of the air intake chamber is 40 cm and the length L4 is 60 cm.

[0037] Example 4

[0038] On the basis of Example 3, Figure 3 The figure shows the arrangement of the liquid inlet pipe 1 and seven parallel liquid inlet jet nozzles 2. The axis of one central nozzle coincides with the axis of the liquid inlet pipe 1, and the axes of the remaining six liquid inlet jet nozzles 2 are evenly distributed around the central nozzle at 60° intervals. The circle with the central nozzle axis as the center and the circle passing through the center of the remaining six liquid inlet jet nozzles 2 is a concentric circle of the liquid inlet pipe flow section, and the concentric circle diameter is 25 cm. The shaded area is a solid surface. Among them, the diameter of the liquid inlet pipe D1 is 40 cm, and the diameter of the liquid inlet of the liquid inlet jet nozzle 2 is D 21 10cm, length L 21 The liquid inlet jet nozzle 2 is connected to a nozzle with an outlet diameter D 22 2cm, nozzle length L 22 The nozzle outlet is 10 cm and the position is in the same plane as the air inlet pipe 3.

Claims

1. A Venturi multi-stage gas-liquid mixer with parallel jet nozzles, characterized in that: The invention comprises a liquid inlet pipe (1), an air suction chamber (4), a venturi tube contraction pipe section (5), a venturi tube throat section (6) and a venturi tube diffusion pipe section (7) which are connected in sequence. A plurality of air inlet pipes (3) are evenly arranged on the same circumference of the outer wall of the air suction chamber (4). Seven liquid inlet jet nozzles (2) are arranged in the air suction chamber (4). The inlets of the seven liquid inlet jet nozzles (2) are connected to the liquid inlet pipe (1) in common.

2. The Venturi multi-stage gas-liquid mixer with parallel jet nozzles according to claim 1, characterized in that: Four air inlet pipes (3) are evenly arranged on the air intake chamber (4) around its outer side wall.

3. The Venturi multi-stage gas-liquid mixer with parallel jet nozzles according to claim 1, characterized in that: One of the seven liquid inlet jet nozzles (2) is a central nozzle, the axis of the central nozzle coincides with the axis of the liquid inlet pipe (1), and the axes of the remaining six liquid inlet jet nozzles (2) are parallel to each other and are evenly distributed around the axis of the central nozzle at intervals of 60 degrees. The circle with the axis of the central nozzle as the center and passing through the center of the remaining six liquid inlet jet nozzles (2) is a concentric circle of the flow section of the liquid inlet pipe (1).

4. The Venturi multi-stage gas-liquid mixer with parallel jet nozzles according to claim 3, characterized in that: The outlet positions of the seven liquid inlet jet nozzles (2) and the position of the air inlet pipe (3) are in the same plane.

5. The Venturi multi-stage gas-liquid mixer with parallel jet nozzles according to claim 4, characterized in that: The diameter D2 of the liquid inlet jet nozzle (2) is 1 / 5 of the diameter D1 of the liquid inlet pipe (1).

6. The Venturi multi-stage gas-liquid mixer with parallel jet nozzles according to claim 5, characterized in that: The outlet diameter of the liquid inlet jet nozzle (2) is 1 / 5 of the diameter of the liquid inlet port of the liquid inlet jet nozzle (2).

7. The Venturi multi-stage gas-liquid mixer with parallel jet nozzles according to claim 1, characterized in that: The length of the venturi tube contraction section (5) is 1 / 2 of the length of the venturi tube diffusion section (7).

8. The Venturi multi-stage gas-liquid mixer with parallel jet nozzles according to claim 7, characterized in that: The diameter of the venturi tube throat section (6) is 1 / 8 of the outlet diameter of the venturi tube diffusion section (7).

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