Liquid dripping device

Abstract

The utility model discloses a liquid dripping device, including a reactor, a dripping tank is arranged above the reactor, a horizontal annular dripping tube is arranged in the reactor, and a plurality of small holes are evenly distributed at the lower part of the annular dripping tube; the reactor and the dripping tank are connected through a dripping assembly, the dripping assembly includes a first dripping tube and a second dripping tube connected to each other, a flow limiting orifice is arranged at the connection between the first dripping tube and the second dripping tube, the free end of the first dripping tube extends into the reactor and is connected with the annular dripping tube, and the free end of the second dripping tube is connected with the discharge port at the bottom of the dripping tank. The diameter of the first dripping tube is smaller than that of the second dripping tube, and the diameter of the annular dripping tube is smaller than that of the first dripping tube, so as to fully ensure the liquid pressure in the first dripping tube and the annular dripping tube, and achieve the effect of uniform dripping. The flow limiting orifice controls the flow rate of the liquid, so that a pressure difference is generated on both sides of the flow limiting orifice, and the liquid pressure of the first dripping tube is increased, so as to achieve the purpose of dispersed dripping.

Description

Technical Field

[0001] The utility model relates to the field of fine chemical production equipment, in particular to a liquid dripping device. Background Art

[0002] In the production process of fine chemicals, in order to control violent chemical reactions or prevent the added materials from being too concentrated in the reaction system and causing unnecessary side reactions, a uniform and dispersed dropwise addition method is usually adopted to add different liquid materials to the container. Most of these dropwise addition reactions are exothermic reactions.

[0003] The existing method of adding liquid materials dropwise is generally to add directly through the reactor dropwise port, or to install a spray ball at the reactor dropwise port for dispersed addition. When adding directly, the liquid material enters the container in a point-like manner and flows down in strands, which has poor dispersion performance and is unevenly mixed with the reaction liquid in the container, which can easily cause excessive local concentration, resulting in excessively fast local reactions and increased side reactions, seriously affecting product quality. Although the spray ball has the effect of dispersed addition, this method still has the problem of difficult control of the dropwise addition speed, which can be fast or slow, and cannot achieve the purpose of uniform and dispersed addition. It is easy to cause the added material to be locally over-concentrated in the reaction system, increasing the risk of material impact or the degree of side reactions. Utility Model Content

[0004] The utility model provides a liquid dripping device, which aims to solve the problem that when dripping liquid materials, the dripping materials cannot be dripped at a uniform speed and dispersedly, resulting in local overconcentration of the dripped materials in the reaction system and a high risk of material impact.

[0005] To achieve its purpose, the utility model adopts the following technical solutions:

[0006] A liquid dropping device comprises a reactor, a dropping tank is arranged above the reactor, a horizontal annular dropping tube is arranged in the reactor, and a plurality of small holes are evenly distributed on the lower part of the annular dropping tube; the reactor and the dropping tank are connected through a dropping assembly, the dropping assembly comprises a first dropping tube and a second dropping tube connected to each other, and the diameter of the first dropping tube is smaller than that of the second dropping tube; a flow limiting orifice is arranged at the connection between the first dropping tube and the second dropping tube, the free end of the first dropping tube extends into the reactor and is connected with the annular dropping tube, and the free end of the second dropping tube is connected with a discharge port at the bottom of the dropping tank.

[0007] Furthermore, a sight glass and a first ball valve are provided on the first dripping tube, and the first dripping tube is connected to the reaction kettle through a first flange.

[0008] Furthermore, a second ball valve is provided on the second dripping tube, and the second dripping tube and the discharge port at the bottom of the dripping tank are connected through a second flange.

[0009] Furthermore, the annular dripping pipe comprises a plurality of dripping elbows, and adjacent dripping elbows are sleeved through a first dripping pipe joint, and a first interface and a second interface of different sizes are arranged at both ends of the first dripping pipe joint.

[0010] Furthermore, the outer wall of the first drip pipe joint is fixed by a third flange and flange bolts.

[0011] Furthermore, the first dripping tube is connected to the annular dripping tube through a second dripping tube joint, and the outer wall of the second dripping tube joint is fixed by a pipe clamp hoop and a hoop bolt.

[0012] Furthermore, an arc-shaped interface is provided at the end of the first dripping tube connected to the annular dripping tube.

[0013] Furthermore, the first dripping tube extending into the reaction kettle is perpendicular to the annular dripping tube.

[0014] Furthermore, the diameter of the annular dripping tube is smaller than or equal to the diameter of the first dripping tube.

[0015] Furthermore, the top of the dropping tank is respectively connected with a vacuum tube, a feed pipe, a nitrogen tube, a vacuum pressure gauge and an exhaust gas discharge pipe; valves are provided on the vacuum tube, the feed pipe, the nitrogen tube and the exhaust gas discharge pipe, and a breathing valve is provided on the exhaust gas discharge pipe; a liquid level gauge is provided on the side wall of the dropping tank.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0017] 1. The liquid dripping device provided by the utility model has a first dripping tube with a smaller diameter than the second dripping tube, and a ring-shaped dripping tube with a diameter less than or equal to the diameter of the first dripping tube, so as to fully ensure the liquid pressure in the first dripping tube and the ring-shaped dripping tube, thereby achieving a uniform dripping effect. The flow-limiting orifice plate can control the flow rate of the liquid on the one hand, and can generate a pressure difference on both sides of the flow-limiting orifice plate on the other hand, appropriately increase the liquid pressure of the first dripping tube, and promote the liquid to flow out of the small hole at the bottom of the ring-shaped dripping tube in the kettle, thereby producing a spraying effect. In addition, a breathing valve is arranged on the dripping tank, and the constant pressure in the dripping tank is further guaranteed by adjusting the breathing valve, so that the dripping tube and the ring-shaped dripping tube in the kettle have a continuous and stable pressure, thereby achieving the purpose of controlling the uniform speed and dispersed dripping of the liquid.

[0018] 2. The liquid dripping device provided by the utility model uses a first dripping pipe joint and a second dripping pipe joint to assemble the dripping assembly, so that the device can be easily installed without opening the reactor cover. The end of the first dripping pipe connected to the annular dripping pipe is provided with an arc interface, so that the first dripping pipe and the annular dripping pipe are more tightly connected; the outer wall of the second dripping pipe joint is fixed by a pipe clamp hoop and a hoop bolt, which not only realizes the fixation of the annular dripping pipe in the reactor, but also ensures the sealing of the second dripping pipe joint. In addition, the annular dripping pipe, flange, dripping assembly and dripping pipe are all made of stainless steel or anti-corrosion and pressure-resistant materials, and have a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the liquid dripping device of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the annular dripping tube of the utility model;

[0021] Figure 3 This is a schematic diagram of the structure of the first dripping pipe joint of the utility model;

[0022] Figure 4 for Figure 3 Schematic diagram of the half-section structure;

[0023] Figure 5 This is a schematic diagram of the third flange connection structure of the utility model;

[0024] Figure 6 for Figure 5 Schematic diagram of the half-section structure;

[0025] Figure 7 This is a schematic diagram of the pipe clamp hoop structure of the utility model;

[0026] Figure 8 This is a schematic diagram of the arc interface structure of the utility model;

[0027] In the figure: 1-annular dripping pipe; 101-first dripping pipe joint; 1011-first interface; 1012-second interface; 1013-third flange; 1014-flange bolt; 102-second dripping pipe joint; 1021-clamp bolt; 1022-pipe clamp clamp; 1023-arc interface; 103-drip elbow; 2-reactor; 3-drip assembly; 301-first flange; 302-sight glass; 303-first dripping pipe; 304-flow limiting orifice; 305-second dripping pipe; 306-second ball valve; 307-first ball valve; 4-drip tank; 401-second flange; 402-liquid level gauge; 403-breathing valve; 404-vacuum tube; 405-feeding pipe; 406-nitrogen pipe; 407-vacuum pressure gauge; 408-exhaust pipe. DETAILED DESCRIPTION

[0028] The utility model is further described below in conjunction with the accompanying drawings:

[0029] like Figure 1-8 As shown, the utility model is a liquid dropping device, comprising a reactor 2, a dropping tank 4 is arranged above the reactor 2, and the top of the dropping tank 4 is respectively connected with a vacuum tube 404, a feed pipe 405, a nitrogen pipe 406, a vacuum pressure gauge 407 and a tail gas discharge pipe 408; the vacuum tube 404 is used to replace the air in the dropping tank 4 and to evacuate, the feed pipe 405 is used to transfer materials into the dropping tank 4, the nitrogen pipe 406 is used for nitrogen protection and to increase a certain pressure to the dropping tank 4 with nitrogen, and the vacuum pressure gauge 407 is used to measure the pressure and vacuum in the dropping tank 4. Among them, the vacuum tube 404, the feed pipe 405, the nitrogen pipe 406 and the exhaust gas emission pipe 408 are all provided with valves for control, and the exhaust gas emission pipe 408 is provided with a breathing valve 403, the breathing valve 403 is used to ensure a constant pressure in the dropping tank 4, and its end is connected to the exhaust gas emission system; the side wall of the dropping tank 4 is provided with a liquid level gauge 402, the liquid level gauge 402 is used to indicate the liquid level height in the dropping tank 4.

[0030] A horizontal annular dripping tube 1 is installed in the reactor 2, and a plurality of small holes are evenly distributed on the lower part of the annular dripping tube 1; the annular dripping tube 1 includes a plurality of dripping elbows 103, and adjacent dripping elbows 103 are sleeved through a first dripping pipe joint 101, and first interfaces 1011 and second interfaces 1012 of different sizes are provided at both ends of the first dripping pipe joint 101, and the outer wall of the first dripping pipe joint 101 is fixed by a third flange 1013 and flange bolts 1014.

[0031] The reactor 2 and the dripping tank 4 are connected through the dripping assembly 3, and the dripping assembly 3 includes a first dripping tube 303 and a second dripping tube 305 connected to each other, and the diameter of the first dripping tube 303 is smaller than that of the second dripping tube 305; a flow limiting orifice 304 is provided at the junction of the first dripping tube 303 and the second dripping tube 305, and the flow limiting orifice 304 is used to adjust and control the liquid dripping speed; the free end of the first dripping tube 303 extends into the reactor 2 and is vertically connected to the annular dripping tube 1 through the second dripping tube joint 102, and the end of the first dripping tube 303 connected to the annular dripping tube 1 is provided with There is an arc-shaped interface 1023, which makes the first dripping tube 303 and the annular dripping tube 1 more tightly connected. The diameter of the annular dripping tube 1 is smaller than that of the first dripping tube 303, which fully guarantees the liquid pressure in the first dripping tube 303 and the annular dripping tube 1, and achieves the effect of uniform dripping; the outer wall of the second dripping tube joint 102 is fixed by a pipe clamp clamp 1022 and a clamp bolt 1021, which not only realizes the fixation of the annular dripping tube 1 in the reactor 2, but also ensures the sealing of the second dripping tube joint 102; the free end of the second dripping tube 305 is connected to the discharge port at the bottom of the dripping tank 4.

[0032] The first dripping tube 303 is provided with a sight glass 302 and a first ball valve 307, the sight glass 302 is used to observe the flow of liquid in the dripping tube, and the first dripping tube 303 is connected to the reactor 2 through a first flange 301. The second dripping tube 305 is provided with a second ball valve 306, and the second dripping tube 305 is connected to the bottom discharge port of the dripping tank 4 through a second flange 401.

[0033] Taking the addition of sodium nitrite aqueous solution as an example, the steps of adding are as follows:

[0034] Step 1: Adjust the pressure of the breathing valve 403 to 0.22Mpa;

[0035] Step 2: Check and ensure that the valves on the second ball valve 306, the feed pipe 405 and the nitrogen pipe 406 are in a closed state;

[0036] Step 3: Open the valve on the vacuum tube 404, evacuate the vacuum, and when the vacuum degree reading of the vacuum pressure gauge 407 is -0.5Mpa, open the valve on the feed pipe 405, and start transferring the sodium nitrite aqueous solution to the dropping tank 4. After the transfer is completed, close the valves of the feed pipe 405 and the vacuum tube 404;

[0037] Step 4: Open the valve of the nitrogen pipe 406, break the vacuum with nitrogen, then pressurize with nitrogen, adjust the nitrogen pressure, and maintain the pressure reading of the vacuum pressure gauge 407 at 0.2Mpa;

[0038] Step 5: Open the second ball valve 306 and the first ball valve 307, adjust the flow limiting orifice 304, stabilize the nitrogen pressure in the dropping tank 4 at 0.2Mpa, observe the sight glass 302, drip the sodium nitrite aqueous solution at a uniform speed through the dropping tank 4 and the annular dropping tube 1, and then spray the sodium nitrite aqueous solution into the reaction system of the reactor 2 through the evenly distributed holes at the bottom of the annular dropping tube 1;

[0039] Step 6: By repeatedly adjusting the pressure of the breathing valve 403, the flow limiting orifice 304 and the nitrogen pipe 406, the sodium nitrite aqueous solution can be dripped into the reaction system of the reactor 2 at a uniform and dispersed speed.

Claims

1. A liquid dropping device, comprising a reaction kettle (2), wherein a dropping tank (4) is provided above the reaction kettle (2), characterized in that: A horizontal annular dripping tube (1) is arranged in the reactor (2), and a plurality of small holes are evenly distributed at the lower part of the annular dripping tube (1); the reactor (2) and the dripping tank (4) are connected via a dripping assembly (3); the dripping assembly (3) comprises a first dripping tube (303) and a second dripping tube (305) connected to each other, and the diameter of the first dripping tube (303) is smaller than the diameter of the second dripping tube (305); a flow limiting orifice plate (304) is arranged at the junction of the first dripping tube (303) and the second dripping tube (305); the free end of the first dripping tube (303) extends into the reactor (2) and is connected to the annular dripping tube (1), and the free end of the second dripping tube (305) is connected to a discharge port at the bottom of the dripping tank (4).

2. A liquid dripping device as claimed in claim 1, characterized in that: The first dripping tube (303) is provided with a sight glass (302) and a first ball valve (307), and the first dripping tube (303) is connected to the reaction kettle (2) via a first flange (301).

3. A liquid dripping device as claimed in claim 2, characterized in that: Said The second dripping tube (305) is provided with a second ball valve (306), and the second dripping tube (305) and the bottom discharge port of the dripping tank (4) are connected via a second flange (401).

4. A liquid dropping device as claimed in claim 3, characterized in that: The annular dripping pipe (1) comprises a plurality of dripping elbows (103), adjacent dripping elbows (103) are sleeved via a first dripping pipe joint (101), and both ends of the first dripping pipe joint (101) are provided with a first interface (1011) and a second interface (1012) of different sizes.

5. A liquid dripping device as claimed in claim 4, characterized in that: The outer wall of the first dripping pipe joint (101) is fixed by means of a third flange (1013) and flange bolts (1014).

6. A liquid dripping device as claimed in claim 5, characterized in that: The first dripping tube (303) is connected to the annular dripping tube (1) via a second dripping tube joint (102); the outer wall of the second dripping tube joint (102) is fixed via a pipe clamp hoop (1022) and a hoop bolt (1021).

7. A liquid dripping device as claimed in claim 6, characterized in that: An arc-shaped interface (1023) is provided at the end of the first dripping tube (303) connected to the annular dripping tube (1).

8. A liquid dripping device as claimed in claim 7, characterized in that: The first dripping tube (303) extending into the reaction kettle (2) is perpendicular to the annular dripping tube (1).

9. A liquid dripping device as claimed in claim 8, characterized in that: The diameter of the annular dripping tube (1) is smaller than or equal to the diameter of the first dripping tube (303).

10. A liquid dripping device according to any one of claims 1 to 9, characterized in that: The top of the dropping tank (4) is respectively connected to a vacuum tube (404), a feed tube (405), a nitrogen tube (406), a vacuum pressure gauge (407) and an exhaust gas discharge pipe (408); valves are provided on the vacuum tube (404), the feed tube (405), the nitrogen tube (406) and the exhaust gas discharge pipe (408), and a breathing valve (403) is provided on the exhaust gas discharge pipe (408); and a liquid level gauge (402) is provided on the side wall of the dropping tank (4).

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