Novel venturi mixer for mixing waste gas

Abstract

The utility model discloses a novel venturi mixer for mixing waste gas, which comprises a venturi tube, and the venturi tube comprises a contraction tube, a throat straight tube and an expansion tube which are connected in sequence; the four-way pipe comprises a main pipe and branch pipes which are symmetrically arranged on two sides of the main pipe and are communicated with the main pipe; the air suction port end of the main pipe air channel is connected with the air inlet end of the shrinkage pipe. An injection pipe is arranged in the throat straight pipe; the outer side of the expansion pipe is sleeved with a combustion-supporting pipe; the end, close to the throat straight pipe, of the combustion-supporting pipe is in welded sealing connection with the expansion pipe, the other end of the combustion-supporting pipe is an open end, a bundling opening is formed in the end of the open end, and first rotational flow blades are evenly arranged on the circumference of the inner wall of the bundling opening at intervals; the device is compact in structure, normal-pressure or low-pressure waste gas and combustion-supporting gas can be fully mixed, the mixing effect is good, supercharging equipment does not need to be additionally purchased, and the waste gas treatment cost of enterprises can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of waste gas incineration treatment, in particular to a novel venturi mixer for waste gas mixing. Background Art

[0002] At present, the conventional method for treating waste gas is incineration. The waste gas is mixed with air and then sprayed into an incinerator for incineration treatment. However, the existing waste gas incineration burner has certain requirements for the waste gas and needs a relatively stable pressure (not less than 10 kPa). Therefore, when the waste gas enters, a booster fan needs to be configured separately to boost the waste gas to meet the requirements. Due to the characteristics of the waste gas being flammable and explosive, the configuration requirements for the booster fan are very high, and the price of the booster fan that can meet the requirements is relatively high. Therefore, the cost of enterprises for treating waste gas is relatively high.

[0003] Chinese Patent CN220750131U discloses an oxygen-enriched spray gun based on a venturi tube structure. This patent integrates the venturi tube structure into the oxygen-enriched spray gun to realize the feeding of fly ash, improve the melting efficiency of fly ash, and reduce the problem of fly ash escape. However, this patent also has certain defects. For example, the gas inlet pipe is arranged at the end outlet of the venturi tube structure for introducing gas, and the gas and the oxygen-enriched air flow are simply directly mixed, resulting in uneven and insufficient mixing. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a novel venturi mixer for waste gas mixing.

[0005] The innovation point of the utility model lies in that: the structure of this application is compact, the waste gas under normal pressure or low pressure can be fully mixed with the combustion-supporting gas, the mixing effect is good, and there is no need to purchase additional boosting equipment, which can reduce the cost of enterprises for treating waste gas.

[0006] To achieve the above-mentioned utility model purpose, the technical solution of the utility model is:

[0007] A new Venturi mixer for waste gas mixing, comprising a Venturi tube, the Venturi tube including a contraction tube, a throat straight tube and an expansion tube connected in sequence; further comprising a four-way tube, the four-way tube including a main tube and branch tubes symmetrically arranged on both sides of the main tube and communicating with the main tube, the included angle between the airway of the branch tube and the suction port end of the airway of the main tube being an obtuse angle; the suction port end of the airway of the main tube being connected to the intake end of the contraction tube; an ejector tube being arranged in the throat straight tube; a combustion-supporting tube being sleeved outside the expansion tube; one end of the combustion-supporting tube close to the throat straight tube being welded and sealed to the expansion tube, the other end being an open end, a constriction being arranged at the end of the open end, and first swirl vanes being evenly spaced around the inner circumference of the constriction; the combustion-supporting gas rotates and converges towards the center of the outlet end of the expansion tube after passing through the constriction and the first swirl vanes; a flow-expanding cone being arranged at the center of the end of the outlet end of the expansion tube, the cone part of the flow-expanding cone pointing towards the center of the throat straight tube, and second swirl vanes being evenly spaced around the circumference between the end of the outlet end of the expansion tube and the flow-expanding cone; the waste gas rotates and diffuses outwards after passing through the second swirl vanes.

[0008] Further, a flow equalizing plate is also arranged inside the expansion tube, and flow equalizing holes are evenly distributed on the flow equalizing plate.

[0009] Further, the outlet end of the ejector tube is close to the intake end of the expansion tube.

[0010] Further, the included angle between the airway of the branch tube and the suction port end of the airway of the main tube is 120°-140°.

[0011] The beneficial effects of the present utility model are as follows:

[0012] First: A four-way tube is arranged at the front end of the contraction section of the Venturi tube in this application, which can be connected to multiple waste gas pipes, and the included angle between the airway of the branch tube of the four-way tube and the suction port end of the airway of the main tube is an obtuse angle, with small wind pressure loss and flexible structure.

[0013] Second: An ejector tube is arranged in the throat straight tube of the Venturi tube. The ejector tube is connected to a high-pressure ejector gas (such as nitrogen). After introducing the high-pressure ejector gas, a negative pressure is formed to suck in the waste gas in the normal pressure or low pressure state. Therefore, there is no need to add a booster fan anymore, and high-pressure gas sources are usually available in general chemical enterprises, so there is no need to purchase additionally, reducing the cost of waste gas treatment for enterprises.

[0014] Third: A flow equalizing plate is arranged in the diffusion tube to play a role in even distribution, and a flow-expanding cone is arranged at the end of the outlet end of the expansion tube to play a guiding role, guiding the waste gas flow to the second swirl vanes. At the same time, due to the flow equalizing plate arranged at the front end, the waste gas can pass through the second swirl vanes evenly, improving the uniformity of waste gas outlet and contributing to improving the uniformity of subsequent mixing.

[0015] Fourth: A constriction is provided at the end of the open end of the combustion-supporting pipe to gather the combustion-supporting gas. At the same time, the first swirl vane rotates the combustion-supporting gas, while the exhaust gas rotates and diffuses outward after passing through the second swirl vane. The combustion-supporting gas is mixed with the exhaust gas at a certain inclination angle and rotation angle, and the mixing of the two is more uniform and the mixing effect is better. Brief Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the present utility model.

[0017] Figure 2 It is a cross-sectional view of the end of the outlet of the expansion pipe.

[0018] In the figure: 10 is a four-way pipe, 11 is a main pipe, 12 is a branch pipe, 20 is a Venturi tube, 21 is a contraction pipe, 22 is a throat straight pipe, 23 is an expansion pipe, 24 is a flow expansion cone, 25 is a second swirl vane, 26 is a flow equalizing plate, 30 is an injection pipe, 40 is a combustion-supporting pipe, 41 is a constriction, and 42 is a first swirl vane. Detailed Embodiment

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings.

[0020] A novel Venturi mixer for waste gas mixing includes a Venturi tube 20, and the Venturi tube 20 includes a contraction tube 21, a throat straight tube 22, and an expansion tube 23 connected in sequence; it further includes a four-way pipe 10, and the four-way pipe 10 includes a main pipe 11 and branch pipes 12 symmetrically arranged on both sides of the main pipe 11 and communicating with the main pipe 11. The included angle between the airway of the branch pipe 12 and the suction port end of the airway of the main pipe 11 is an obtuse angle; the suction port end of the airway of the main pipe 11 is connected to the intake end of the contraction tube 21; an injection pipe 30 is arranged in the throat straight tube 22; a combustion-supporting pipe 40 is sleeved outside the expansion tube 23; one end of the combustion-supporting pipe 40 close to the throat straight tube 22 is welded and sealed to the expansion tube 23, and the other end is an open end. A constriction 41 is provided at the end of the open end, and first swirl vanes 42 are evenly spaced around the inner wall of the constriction 41; the combustion-supporting gas rotates and gathers towards the center of the outlet end of the expansion tube 23 after passing through the constriction 41 and the first swirl vanes 42; a flow expansion cone 24 is arranged at the center of the end of the outlet of the expansion tube 23, and the conical part of the flow expansion cone 24 points to the center of the throat straight tube 22. Second swirl vanes 25 are evenly spaced around between the end of the outlet of the expansion tube 23 and the flow expansion cone 24; the exhaust gas rotates and diffuses outward after passing through the second swirl vanes 25.

[0021] Further, the first swirl vanes 42 and the second swirl vanes 25 are inclined, and their inclined directions are opposite.

[0022] Furthermore, a flow balancing plate 26 is disposed inside the expansion tube 23 , and flow balancing holes (not shown in the figure) are evenly distributed on the flow balancing plate 26 .

[0023] Furthermore, the gas outlet end of the ejector tube 30 is close to the gas inlet end of the extension tube 23 .

[0024] Furthermore, the angle α between the airway of the branch pipe 12 and the air inlet end of the airway of the main pipe 11 is 120°-140°.

[0025] How this application works:

[0026] An ejector pipe 30 is arranged in the throat straight pipe 22 of the venturi tube 20. The ejector pipe 30 is connected to a high-pressure ejector gas (such as nitrogen). After the high-pressure ejector gas is introduced, a negative pressure is formed to suck in the waste gas in a normal pressure or low pressure state. Therefore, there is no need to add a booster fan. In general, chemical companies have a high-pressure gas source on hand and do not need to purchase it separately, which reduces the cost of waste gas treatment for the company.

[0027] After the exhaust gas enters the diffuser 23, it passes through the flow equalizer 26 to form a uniform flow, and then passes through the expansion cone 24 to guide the exhaust gas flow to the second swirl blade 25, thereby improving the uniformity of the exhaust gas outlet and helping to improve the uniformity of subsequent mixing.

[0028] The combustion-supporting gas passes through the bundle port 41 and the first swirl blade 42, gathers and rotates toward the center of the gas outlet end of the diffuser 23, while the exhaust gas rotates and diffuses outward after passing through the second swirl blade 25. The combustion-supporting gas is mixed with the exhaust gas at a certain inclination angle and rotation angle, and the mixing of the two is more uniform and the mixing effect is better.

[0029] The described embodiments are only some embodiments of the utility model, not all embodiments. Based on the embodiments of 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.

Claims

1. A novel venturi mixer for exhaust gas mixing, comprising a venturi tube (20), wherein the venturi tube (20) comprises a contraction tube (21), a throat straight tube (22) and an expansion tube (23) connected in sequence; the characteristics are: The invention also comprises a four-way pipe (10), wherein the four-way pipe (10) comprises a main pipe (11) and branch pipes (12) symmetrically arranged on both sides of the main pipe (11) and connected to the main pipe (11), wherein the angle between the airway of the branch pipe (12) and the air intake port of the airway of the main pipe (11) is an obtuse angle; the air intake port of the airway of the main pipe (11) is connected to the air inlet end of the contraction pipe (21); an ejector pipe (30) is arranged inside the throat straight pipe (22); a combustion-supporting pipe (40) is sleeved on the outside of the expansion pipe (23); one end of the combustion-supporting pipe (40) close to the throat straight pipe (22) is welded and sealed to the expansion pipe (23), and the other end is an open end. The end of the opening is provided with a constriction port (41), and first swirl blades (42) are evenly spaced around the inner wall of the constriction port (41); after the combustion-supporting gas passes through the constriction port (41) and the first swirl blades (42), it rotates and gathers toward the center of the gas outlet end of the expansion tube (23); a diffusion cone (24) is provided at the center of the gas outlet end of the expansion tube (23), and the cone of the diffusion cone (24) points to the center of the throat straight tube (22); second swirl blades (25) are evenly spaced around the gas outlet end of the expansion tube (23) and the diffusion cone (24); after the exhaust gas passes through the second swirl blades (25), it rotates and diffuses outward.

2. A novel exhaust gas mixing venturi mixer according to claim 1, characterized in that: A flow balancing plate (26) is also provided inside the expansion tube (23), and flow balancing holes are evenly distributed on the flow balancing plate (26).

3. A novel exhaust gas mixing venturi mixer according to claim 1, characterized in that: The gas outlet end of the ejector tube (30) is close to the gas inlet end of the expansion tube (23).

4. A novel exhaust gas mixing venturi mixer according to claim 1, characterized in that: The angle between the airway of the branch pipe (12) and the air inlet end of the airway of the main pipe (11) is 120°-140°.

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