Venturi injector

Abstract

The utility model relates to chemical experiment and chemical production field especially is concerned with gas -liquid material mixing equipment field, concretely relates to a venturi injector, solves the problem of gas -liquid mixing efficiency, realizes gas material and liquid material mixing through the effect of nozzle and spray pipe, improves gas -liquid mixing efficiency, including the shell, the shell is equipped with the nozzle of vertical distribution inside, the lower extreme of nozzle is equipped with the nozzle mouth of inverted cone, the top of shell is equipped with the first material inlet pipe of intercommunication nozzle upper end, the side wall between nozzle and shell forms first interlayer cavity, the side wall of shell is equipped with the second material inlet pipe of intercommunication interlayer cavity, the lower extreme of shell is connected with the spray pipe of vertical distribution, the spray pipe is venturi pipe, the spray pipe is from top to bottom in proper order contraction pipe section, throat pipe section and expansion pipe section, the nozzle mouth of nozzle extends to the contraction pipe section of spray pipe, forms second interlayer cavity between the outer wall of nozzle mouth and the contraction pipe section of spray pipe.

Description

Technical Field

[0001] This utility model relates to the fields of chemical experiments and chemical production, and in particular to the field of gas-liquid material mixing equipment, specifically to a Venturi injector. Background Technology

[0002] In chemical processes or chemical production, it is often necessary to mix two chemical materials before a reaction. Material mixing can include liquid-liquid mixing, gas-gas mixing, and gas-liquid mixing. Gas-liquid mixing, which involves mixing gaseous and liquid materials, is particularly challenging due to their different states. To achieve this mixing, a gas-liquid mixer is typically installed at the reactor inlet to combine the gas and liquid.

[0003] Among them, the most common is the Venturi mixer, which uses the negative pressure generated when the liquid material passes through the throat section of the Venturi tube to draw in the gas material, and then mixes it before entering the expansion section to achieve mixing. However, in actual use, the gas-liquid mixing effect is poor. Utility Model Content

[0004] This invention provides a Venturi injector that solves the problem of gas-liquid mixing efficiency. It achieves mixing of gaseous and liquid materials through the action of nozzles and spray pipes, thereby improving gas-liquid mixing efficiency.

[0005] This utility model is achieved through the following technical solution: A Venturi injector includes a housing, wherein vertically distributed nozzles are provided inside the housing, the lower end of each nozzle is provided with an inverted conical nozzle orifice, and the top of the housing is provided with a first material inlet pipe communicating with the upper end of the nozzles; A first interlayer cavity is formed between the sidewall of the nozzle and the outer shell, and the sidewall of the outer shell is provided with a second material inlet pipe communicating with the interlayer cavity; The lower end of the outer shell is connected to vertically distributed nozzles, which are venturi tubes, and the nozzles are arranged from top to bottom as a constriction section, a throat section and an expansion section. The nozzle orifice extends into the constriction section of the nozzle pipe, and a second interlayer cavity is formed between the outer wall of the nozzle orifice and the constriction section of the nozzle pipe.

[0006] Furthermore, the first material inlet pipe is used to introduce liquid materials, and the second material inlet pipe is used to introduce gaseous materials.

[0007] Furthermore, both the nozzle and the spray pipe are made of silicon carbide.

[0008] Furthermore, the outer shell is a cylindrical structure, and connecting flanges are provided on the outer circumference of both the upper and lower ends of the outer shell. The outer surface of the connecting flange is provided with coaxially distributed grooves. The upper outer circumference of both the nozzle and the nozzle pipe is fixed with a positioning ring plate. The positioning ring plate of the nozzle is assembled in the groove at the upper end of the outer shell, and the positioning ring plate of the nozzle pipe is assembled in the groove at the lower end of the outer shell. The outer sides of the connecting flanges are all detachably fixed with clamping flanges.

[0009] Furthermore, the thickness of the positioning ring plate is less than the height of the sink, and PTFE gaskets are installed on both the upper and lower sides of the positioning ring plate inside the sink.

[0010] Furthermore, the outer shell is made of 304 stainless steel, and the inner side of the outer shell is coated with polytetrafluoroethylene.

[0011] Furthermore, the length of the nozzle is 110~300mm; the length of the spray pipe is 120~500mm.

[0012] The beneficial effects achieved by this utility model compared with the prior art are as follows: 1. The Venturi injector of this utility model includes a housing, a nozzle, and a nozzle pipe. A first interlayer cavity is formed between the side wall of the nozzle and the housing. A second material inlet pipe communicating with the interlayer cavity is provided on the side wall of the housing. The nozzle orifice extends into the converging section of the nozzle pipe. A second interlayer cavity is formed between the outer wall of the nozzle orifice and the converging section of the nozzle pipe. This invention is applicable to gas-liquid reactions. The gaseous material enters the first jacketed cavity through the second material inlet pipe, while the liquid material enters the nozzle through the first material inlet pipe. The liquid is then ejected from the nozzle orifice in a jet pattern into the bottom spray pipe. Because the nozzle orifice is inverted conical, the liquid flow velocity gradually increases, creating a negative pressure in the space between the spray pipe and the nozzle. This negative pressure attracts the gaseous material from the first jacketed cavity, causing the gas and liquid to mix in the throat section of the spray pipe. Finally, after passing through the throat section, the mixture diffuses in the expansion section, where it also mixes further. This invention achieves thorough mixing of gaseous and liquid materials through the nozzle and spray pipe, improving gas-liquid mixing efficiency and subsequent reaction efficiency within the reaction vessel. 2. Both the nozzle and the spray pipe are made of silicon carbide, which can adapt to most corrosive chemical materials, thereby improving the overall corrosion resistance; 3. Connecting flanges are provided on the outer circumference of both the upper and lower ends of the outer casing. The outer surfaces of the connecting flanges have coaxially distributed grooves. The nozzle's positioning ring plate is fitted into the groove at the upper end of the outer casing, and the nozzle's positioning ring plate is fitted into the groove at the lower end of the outer casing. The outer surfaces of the connecting flanges are detachably fixed with clamping flanges. This design facilitates the installation of the nozzle and nozzle, and also facilitates subsequent disassembly and replacement. 4. The thickness of the positioning ring plate is less than the height of the settling tank. PTFE gaskets are installed on both the upper and lower sides of the positioning ring plate inside the settling tank. These gaskets not only provide sealing and corrosion protection, but more importantly, they prevent the positioning ring plate from directly contacting the connecting flange and the clamping flange, thus preventing damage to the positioning ring plate. Attached Figure Description

[0013] Figure 1 This is a three-dimensional schematic diagram of the Venturi injector described in this utility model; Figure 2 This is a schematic diagram of the interior of the Venturi injector described in this utility model; Figure 3 This is a schematic diagram showing the fit between the positioning ring plate, the clamping flange, and the connecting flange of the Venturi injector described in this utility model; In the diagram: 1. Outer shell, 2. Nozzle, 3. Nozzle opening, 4. First material inlet pipe, 5. First interlayer cavity, 6. Second material inlet pipe, 7. Spray pipe, 8. Second interlayer cavity, 9. Connecting flange, 10. Positioning ring plate, 11. Compression flange, 12. PTFE flat gasket. Detailed Implementation

[0014] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0015] In the description of the utility model, it should be understood that the terms "front", "rear", "up", "down", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the utility model.

[0016] Example 1 like Figure 1-3 As shown, this embodiment discloses a Venturi injector, which mainly includes a housing 1, a nozzle 2, a nozzle pipe 7, and two clamping flanges 11. The housing 1 is a cylindrical structure made of 304 stainless steel, and has a polytetrafluoroethylene (PTFE) coating on its inner side. PTFE has good corrosion resistance. Connecting flanges 9 are machined on the outer circumference of both the upper and lower ends of the housing 1, and coaxially distributed grooves are machined on the outer surface of the connecting flanges 9.

[0017] To withstand most corrosive chemicals, such as concentrated sulfuric acid and concentrated nitric acid, both nozzle 2 and nozzle pipe 7 are made of silicon carbide, a high-temperature and corrosion-resistant ceramic material. The nozzles 2 are coaxially and vertically distributed within the cavity of the outer shell 1. In this embodiment, the overall length of nozzle 2 is 195mm. The upper section of nozzle 2 is a straight pipe section, and the lower end of nozzle 2 is an inverted conical nozzle orifice 3. To facilitate assembly of nozzle 2 and outer shell 1, a positioning ring plate 10 is provided on the outer circumference of the upper end of nozzle 2. The positioning ring plate 10 of nozzle 2 is assembled into the groove at the upper end of outer shell 1, and a clamping flange 11 is fixedly connected to the connecting flange 9 using bolt assemblies, thereby fixing nozzle 2 inside outer shell 1. A first material inlet pipe 4 is machined on the clamping flange 11, which connects to the upper end of nozzle 2. A first interlayer cavity 5 is formed between the sidewall of nozzle 2 and the outer shell 1. A second material inlet pipe 6 is machined on the sidewall of the outer shell 1, and the second material inlet pipe 6 is used to connect to the first interlayer cavity 5. The first material inlet pipe 4 is used to introduce liquid material, and the second material inlet pipe 6 is used to introduce gaseous material.

[0018] The nozzle 7 is vertically distributed at the lower end of the outer casing 1. The nozzle 7 is a venturi tube with an overall length of 395mm. From top to bottom, the nozzle 7 consists of a converging section, a throat section, and a dilator section. To facilitate fixing the nozzle 7 to the lower end of the outer casing 1, a positioning ring plate 10 is machined on the outer circumference of the upper end of the nozzle 7. The positioning ring plate 10 of the nozzle 7 is assembled into a groove at the lower end of the outer casing 1. Another clamping flange 11 is fixedly connected to the outside of the connecting flange 9 by bolt assembly, thereby fixing the nozzle 7 to the lower end of the outer casing 1. The nozzle orifice 3 of the nozzle 2 extends into the converging section of the nozzle 7. A second interlayer cavity 8 is formed between the outer wall of the nozzle orifice 3 and the converging section of the nozzle 7. The second interlayer cavity 8 is interconnected with the first interlayer cavity 5.

[0019] Taking the gas-liquid addition chlorination of propylene to prepare 1,2-dichloropropane as an example, it is necessary to mix the liquid propylene and gaseous chlorine before feeding them into the gas-liquid reactor for reaction. To improve the gas-liquid mixing efficiency, the Venturi injector described in this embodiment is used. The specific working principle is as follows: Chlorine gas enters the first jacketed cavity through the second material inlet pipe, while propylene liquid enters the nozzle through the first material inlet pipe. The liquid is then ejected in a jet pattern from the nozzle orifice into the bottom nozzle. Due to the inverted cone shape of the nozzle orifice, the liquid flow velocity gradually increases, creating a negative pressure in the space between the nozzle and the nozzle. This negative pressure attracts the gaseous material from the first jacketed cavity, causing the gas and liquid to mix in the constriction section of the nozzle. Further mixing occurs in the throat section of the nozzle, and finally, after passing through the throat section, the gas diffuses into the expansion section, where it also mixes. The nozzle and nozzle work together to ensure thorough mixing of the gaseous and liquid materials, improving gas-liquid mixing efficiency and ultimately increasing the reaction efficiency within the reaction vessel.

[0020] Example 2 Based on Example 1, we know that a positioning ring plate 10 is fixed to the upper outer circumference of both the nozzle 2 and the nozzle 7. Both the nozzle 2 and the nozzle 7 are made of silicon carbide. For ease of processing, the nozzle 2 and nozzle 7 are integrally manufactured with the positioning ring plate 10. The positioning ring plate 10 is also made of silicon carbide. As is well known, silicon carbide is a ceramic material. To prevent damage to the positioning ring plate 10 during the tightening process of the clamping flange 11 with the connecting flange 9, such as... Figure 3 As shown, this embodiment provides a Venturi injector. Based on embodiment 1, the thickness of the positioning ring plate 10 is less than the height of the groove of the connecting flange 9. PTFE gaskets 12 are installed on both the upper and lower sides of the positioning ring plate 10 inside the groove. The PTFE gasket 12 is a gasket made of polytetrafluoroethylene material, which not only provides sealing and corrosion resistance, but more importantly, prevents the positioning ring plate from directly contacting the connecting flange and the clamping flange, thus preventing damage to the positioning ring plate.

Claims

1. A Venturi injector, characterized in that, Includes a housing (1), inside which are vertically distributed nozzles (2), the lower end of the nozzles (2) is provided with an inverted conical nozzle opening (3), and the top of the housing (1) is provided with a first material inlet pipe (4) that connects to the upper end of the nozzles (2). A first interlayer cavity (5) is formed between the side wall of the nozzle (2) and the outer shell (1), and the side wall of the outer shell (1) is provided with a second material inlet pipe (6) that communicates with the first interlayer cavity. The lower end of the outer shell (1) is connected to a vertically distributed nozzle (7), the nozzle (7) is a venturi tube, and the nozzle (7) consists of a constriction section, a throat section and an expansion section from top to bottom; The nozzle orifice (3) of the nozzle (2) extends into the constriction section of the nozzle pipe (7), and a second interlayer cavity (8) is formed between the outer wall of the nozzle orifice (3) and the constriction section of the nozzle pipe (7).

2. The Venturi injector according to claim 1, characterized in that, The first material inlet pipe (4) is used to introduce liquid materials, and the second material inlet pipe (6) is used to introduce gaseous materials.

3. The Venturi injector according to claim 2, characterized in that, Both the nozzle (2) and the spray pipe (7) are made of silicon carbide.

4. The Venturi injector according to claim 3, characterized in that, The outer shell (1) is a cylindrical structure. The outer circumference of the upper and lower ends of the outer shell (1) is provided with connecting flanges (9). The outer surface of the connecting flanges (9) is provided with coaxially distributed grooves. The upper outer circumference of the nozzle (2) and the nozzle pipe (7) are both fixed with positioning ring plates (10). The positioning ring plate (10) of the nozzle (2) is assembled in the groove at the upper end of the outer shell (1), and the positioning ring plate (10) of the nozzle pipe (7) is assembled in the groove at the lower end of the outer shell (1). The outer side of the connecting flange (9) is detachably fixed with a clamping flange (11).

5. The Venturi injector according to claim 4, characterized in that, The thickness of the positioning ring plate (10) is less than the height of the sink, and PTFE flat gaskets (12) are installed on both the upper and lower sides of the positioning ring plate (10) in the sink.

6. The Venturi injector according to any one of claims 1-5, characterized in that, The outer shell (1) is made of 304 stainless steel and the inner side of the outer shell (1) is coated with polytetrafluoroethylene.

7. The Venturi injector according to any one of claims 1-5, characterized in that, The length of the nozzle (2) is 110~300mm; the length of the spray pipe (7) is 120~500mm.

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