Defoaming device at tail end of ozone oxidation tower

Abstract

The utility model provides a defoaming device at the tail end of an ozone oxidation tower, which integrates a gas-liquid separation technology and comprises the ozone oxidation tower, a liquid sealing device, a defoaming device and a heating medium decomposer, according to the invention, a pressure water spraying defoaming method is adopted, and a double-layer S-shaped baffle plate and a double-layer stainless steel wire mesh demister are compositely applied, so that foams generated by the ozone oxidation tower are eliminated, and the problem of safe operation of rear-end facilities caused by the foams generated in the oxidation process of the ozone oxidation tower is solved. The defoaming device is simple in structure, easy to process and good in defoaming effect.

Description

Technical Field

[0001] The invention relates to the field of industrial wastewater treatment, and in particular to a defoaming device at the end of an ozone oxidation tower. Background Art

[0002] Ozone is a strong oxidant, and its oxidizing power is second only to fluorine among natural elements. Its strong oxidizing property can be used to degrade industrial wastewater. The reaction of using ozone gas to treat organic wastewater is fast, there is no secondary pollution, and only air and electricity are needed to produce ozone, and there is no problem of raw material transportation and storage. For industrial wastewater with high pH value and low concentration, ozone oxidation treatment can be used alone. The key equipment of ozone oxidation technology is the ozone generator. Ozone is generated by high-voltage discharge in the generator and enters the oxidation tank filled with activated carbon through the anti-backflow device. The organic matter in the wastewater can directly react with ozone or react with the hydroxyl free radicals generated by the decomposition of ozone in water, which can oxidize the large molecules of pollutants into small molecules, improve the biodegradability of organic matter, and reduce the pollution concentration. Ozone is evenly distributed at the bottom of the oxidation tank through the aeration plate in the oxidation tower, and the pollutants in the wastewater are oxidized by contacting each other during the upflow of wastewater, and the oxidation time is extended by using multiple towers in series to maximize the oxidation effect.

[0003] Although the ozone oxidation process technology is perfect, the existing ozone oxidation device does not have a defoaming facility with good defoaming effect. The foam generated during the ozone oxidation process accumulates in the device and is then discharged into the terminal heat medium decomposer along with the ozone through the discharge pipe, which can easily cause the heat medium decomposer to run at low temperature, the heat medium decomposer catalyst to be blocked, and other faults. Summary of the invention

[0004] In view of the defects of the prior art, the present invention provides a defoaming device with simple structure, easy processing and good effect, which is used to solve the problem of safe operation of back-end facilities caused by foam generated during the oxidation process of the ozone oxidation tower.

[0005] The present invention specifically relates to an ozone oxidation tower terminal defoaming device, comprising an ozone oxidation tower a, a liquid sealing device b, a defoaming device c, and a heat medium decomposer d;

[0006] Among them, the ozone oxidation tower, liquid sealing device, and heat medium decomposer are all existing technologies;

[0007] The defoaming device c is composed of a support foot 10, a defoaming device body 11, a spray pipe 12, a lower grid support 13, an S-shaped baffle 14, a stainless steel wire mesh demister 15, an upper grid support 16, an upper end mirror 17, a lower end mirror 18, and an ozone inlet pipe 19;

[0008] The support legs 10 are made of angle steel, welded to the defoaming device body 11, and evenly distributed around the defoaming device body 11. The height of the support legs 10 must match the height of the spray outlet pipe 11.9 at the bottom to meet the installation height requirements of the spray outlet pipe 11.9.

[0009] The defoaming device body 11 is composed of a cylinder 11.1, an ozone outlet pipe 11.2, an upper head 11.3, a head flange 11.4, a sealing gasket 11.5, a cylinder flange 11.6, and connecting bolts 11.7; a lower head 11.8, and a spray outlet pipe 11.9;

[0010] The spray pipe 12 is composed of a spray pipe end connection flange 12.1, a straight pipe section 12.2, an internal thread elbow 12.3, and an atomizing nozzle 12.4; the atomizing nozzle has a spray angle of 90° and is selected from different specifications of DN20, DN25, and DN32 according to the diameter of the cylinder;

[0011] The spray pipe 12 is composed of a spray pipe end connection flange 12.1, a straight pipe section 12.2, an internal thread elbow 12.3, and an atomizing nozzle 12.4; one end of the internal thread elbow 12.3 is welded to the straight pipe section 12.2, and the other end is threadedly connected to the atomizing nozzle 12.4; the atomizing nozzle 12.4 uses an atomizing nozzle with a spray angle of 90°, and the processing and manufacturing must ensure that the nozzle is vertically downward, and the center line of the nozzle coincides with the center line of the cylinder 11.1; the distance between the horizontal center line of the spray pipe 12 and the horizontal center line of the ozone inlet pipe 19 is h3, which is 1 / 2h1;

[0012] The lower grid support 13 and the upper grid support 16 are both welded from 40mm stainless steel flat steel into a "+" structure, with the outer circumference being the same as the inner diameter Φ of the cylinder 11.1, and are horizontally welded inside the cylinder 11.1;

[0013] The distance h1 between the lower grid support 13 and the ozone inlet pipe 19 is equal to the inner diameter Φ of the cylinder 11.1;

[0014] The distance h2 between the upper grid support 16 and the cylinder flange 11.6 is equal to 2 / 3 of the inner diameter Φ of the cylinder 11.1.

[0015] The upper end mirror 17 can be used to observe the demisting effect, and the S-shaped baffle 14 and the stainless steel wire mesh demister 15 can be cleaned by spraying water in the disassembled state;

[0016] The lower end viewing mirror 18 can be used to observe the defoaming state, and the atomizing nozzle 12.4 can be disassembled, replaced, and cleaned in the disassembled state;

[0017] The ozone inlet pipe 19 adopts a 30° bevel to increase the outlet area, and the bevel surface is within the 90° spray angle range at 30° upward;

[0018] The cylinder 11.1, the spray pipe 12, the lower grid support 13, the upper grid support 16, the upper end mirror 17, the lower end mirror 18, the ozone air inlet pipe 19, the cylinder flange 11.6, the lower end cap 11.8, and the spray outlet pipe 11.9 are welded together; the upper end cap 11.3, the end cap flange 11.4, and the ozone outlet pipe 11.2 are welded together; after adding a sealing gasket 11.5 between the flanges of the two welded bodies, they are connected as a whole by connecting bolts 11.7;

[0019] The utility model adopts a combined method of baffles and wire mesh demister for gas-liquid separation; the baffles are double-layer S-shaped baffles 14; the wire mesh demister is a double-layer stainless steel wire mesh demister 15; the S-shaped baffles 14 ensure the removal of larger droplets, and the stainless steel wire mesh demister 15 ensures the removal of water mist;

[0020] The height of the S-shaped baffle 14 is selected to be 150 mm;

[0021] The height of the stainless steel wire mesh demister 15 is selected to be 100 mm;

[0022] The defoaming device c needs to be placed in a system consisting of a pre-placed ozone oxidation tower a, a liquid sealing device b, a defoaming device c, and a heat medium decomposer d; the defoaming device c needs to be used alone in consideration of specific usage methods and conditions.

[0023] During the use of the utility model, the ozone oxidation tower a, the liquid sealing device b, the defoaming device c, and the heat medium decomposer d are a combined whole, and the specific working process is: the foam generated by the ozone oxidation tower a is transported to the defoaming device c through the pipeline between the defoaming device c and the heat medium decomposer d to be defoamed; the ozone after defoaming is transported to the heat medium decomposer d through the pipeline between the defoaming device c and the heat medium decomposer d to be thermally decomposed and then discharged;

[0024] The defoaming process of the defoaming device is as follows: a pressure water spray defoaming method is adopted, the spray water is atomized by the atomizing nozzle 12.4 of the spray pipe 12, and a large amount of foam entering the defoaming device from the ozone air inlet pipe 19 is sprayed and eliminated, and the spray water is discharged to the ozone terminal liquid sealing device through the spray outlet pipe 11.9, and discharged from the drain port of the ozone oxidation device terminal liquid sealing device; the larger water droplets and water mist generated by defoaming are removed by two layers of S-shaped baffles 14 and two layers of stainless steel wire mesh demisters 15 and then fall back to the bottom of the defoaming device, and are discharged with the spray water through the spray outlet pipe 11.9; the residual ozone in the ozone foam mixed phase after defoaming and demisting is discharged after thermal decomposition by the heat medium decomposer;

[0025] Since the contact materials are ozone gas and colloidal foam and water mist after ozone oxidation, which are highly corrosive, all structures and parts of the defoaming device involved in the utility model are made of 304 stainless steel; Beneficial Effects

[0026] The present invention provides an ozone oxidation tower terminal defoaming device, which integrates gas-liquid separation technology, adopts a pressure water spray defoaming method, and uses a double-layer S-shaped baffle and a double-layer stainless steel wire mesh demister to eliminate the foam generated by the ozone oxidation tower, thereby solving the problem of safe operation of the back-end facilities caused by the foam generated during the oxidation process of the ozone oxidation tower. The present invention has a simple structure, is easy to process, and has a good defoaming effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is an overall diagram of a device according to an embodiment of the present invention;

[0028] Figure 2 is a structural diagram of a defoaming device according to an embodiment of the present invention;

[0029] Figure 3 This is a structural diagram of a grid support of a defoaming device according to an embodiment of the present invention;

[0030] Description of codes in the figure:

[0031] a. Ozone oxidation tower; b. Liquid sealing device; c. Defoaming device; d. Heat medium decomposer;

[0032] 10. Support feet; 11. Defoaming device body; 11.1 Cylinder; 11.2 Ozone outlet; 11.3 Upper head; 11.4 Head flange; 11.5 Sealing gasket; 11.6 Cylinder flange; 11.7 Connecting bolts; 11.8 Lower head; 11.9 Spray outlet; 12. Spray pipe; 12.1 Spray pipe end connection flange; 12.2 Straight pipe section; 12.3 Internal thread elbow; 12.4 Atomizing nozzle; 13. Lower grille bracket; 14. S-shaped baffle; 15. Stainless steel wire mesh demister; 16. Upper grille bracket; 17. Upper end mirror; 18. Lower end mirror; 19. Ozone inlet pipe DETAILED DESCRIPTION

[0033] The technical solution of the present invention is described in detail below through specific embodiments:

[0034] The present invention specifically relates to an ozone oxidation tower terminal defoaming device, comprising an ozone oxidation tower a, a liquid sealing device b, a defoaming device c, and a heat medium decomposer d;

[0035] The defoaming device c is composed of a support foot 10, a defoaming device body 11, a spray pipe 12, a lower grid support 13, an S-shaped baffle 14, a stainless steel wire mesh demister 15, an upper grid support 16, an upper end mirror 17, a lower end mirror 18, and an ozone inlet pipe 19;

[0036] The support legs 10 are made of angle steel, welded to the defoaming device body 11, and evenly distributed around the defoaming device body 11. The height of the support legs 10 must match the height of the spray outlet pipe 11.9 at the bottom to meet the installation height requirements of the spray outlet pipe 11.9.

[0037] The defoaming device body 11 is composed of a cylinder 11.1, an ozone outlet pipe 11.2, an upper head 11.3, a head flange 11.4, a sealing gasket 11.5, a cylinder flange 11.6, and connecting bolts 11.7; a lower head 11.8, and a spray outlet pipe 11.9;

[0038] The spray pipe 12 is composed of a spray pipe end connection flange 12.1, a straight pipe section 12.2, an internal thread elbow 12.3, and an atomizing nozzle 12.4; the atomizing nozzle has a spray angle of 90°, and different specifications of DN20, DN25, and DN32 are selected according to the diameter of the cylinder; in this embodiment, the cylinder diameter is selected as DN25;

[0039] The spray pipe 12 is composed of a spray pipe end connection flange 12.1, a straight pipe section 12.2, an internal thread elbow 12.3, and an atomizing nozzle 12.4; one end of the internal thread elbow 12.3 is welded to the straight pipe section 12.2, and the other end is threadedly connected to the atomizing nozzle 12.4; the atomizing nozzle 12.4 uses an atomizing nozzle with a spray angle of 90°, and the processing and manufacturing must ensure that the nozzle is vertically downward, and the center line of the nozzle coincides with the center line of the cylinder 11.1; the distance between the horizontal center line of the spray pipe 12 and the horizontal center line of the ozone inlet pipe 19 is h3, which is 1 / 2h1;

[0040] The lower grid support 13 and the upper grid support 16 are both welded from 40mm stainless steel flat steel into a "+" structure, with the outer circumference being the same as the inner diameter Φ of the cylinder 11.1, and are horizontally welded inside the cylinder 11.1;

[0041] The distance h1 between the lower grid support 13 and the ozone inlet pipe 19 is equal to the inner diameter Φ of the cylinder 11.1;

[0042] The distance h2 between the upper grid support 16 and the cylinder flange 11.6 is equal to 2 / 3 of the inner diameter Φ of the cylinder 11.1.

[0043] The upper end mirror 17 can be used to observe the demisting effect, and the S-shaped baffle 14 and the stainless steel wire mesh demister 15 can be cleaned by spraying water in the disassembled state;

[0044] The lower end viewing mirror 18 can be used to observe the defoaming state, and the atomizing nozzle 12.4 can be disassembled, replaced, and cleaned in the disassembled state;

[0045] The ozone inlet pipe 19 adopts a 30° bevel to increase the outlet area, and the bevel surface is within the 90° spray angle range at 30° upward;

[0046] The cylinder 11.1, the spray pipe 12, the lower grid support 13, the upper grid support 16, the upper end mirror 17, the lower end mirror 18, the ozone air inlet pipe 19, the cylinder flange 11.6, the lower end cap 11.8, and the spray outlet pipe 11.9 are welded together; the upper end cap 11.3, the end cap flange 11.4, and the ozone outlet pipe 11.2 are welded together; after adding a sealing gasket 11.5 between the flanges of the two welded bodies, they are connected as a whole by connecting bolts 11.7;

[0047] The utility model adopts a combined method of baffles and wire mesh demister for gas-liquid separation; the baffles are double-layer S-shaped baffles 14; the wire mesh demister is a double-layer stainless steel wire mesh demister 15; the S-shaped baffles 14 ensure the removal of larger droplets, and the stainless steel wire mesh demister 15 ensures the removal of water mist;

[0048] The height of the S-shaped baffle 14 is selected to be 150 mm;

[0049] The height of the stainless steel wire mesh demister 15 is selected to be 100 mm;

[0050] The defoaming device c needs to be placed in a system consisting of a pre-placed ozone oxidation tower a, a liquid sealing device b, a defoaming device c, and a heat medium decomposer d; the defoaming device c needs to be used alone in consideration of specific usage methods and conditions.

[0051] During the use of the utility model, the ozone oxidation tower a, the liquid sealing device b, the defoaming device c, and the heat medium decomposer d are a combined whole, and the specific working process is: the foam generated by the ozone oxidation tower a is transported to the defoaming device c through the pipeline between the defoaming device c and the heat medium decomposer d to be defoamed; the ozone after defoaming is transported to the heat medium decomposer d through the pipeline between the defoaming device c and the heat medium decomposer d to be thermally decomposed and then discharged;

[0052] The defoaming process of the defoaming device is as follows: a pressure water spray defoaming method is adopted, the spray water is atomized by the atomizing nozzle 12.4 of the spray pipe 12, and a large amount of foam entering the defoaming device from the ozone air inlet pipe 19 is sprayed and eliminated, and the spray water is discharged to the ozone terminal liquid sealing device through the spray outlet pipe 11.9, and discharged from the drain outlet of the ozone oxidation device terminal liquid sealing device; the larger water droplets and water mist generated by defoaming are removed by two layers of S-shaped baffles 14 and two layers of stainless steel wire mesh demisters 15 and then fall back to the bottom of the defoaming device, and are discharged with the spray water through the spray outlet pipe 11.9; the residual ozone in the ozone foam mixed phase after defoaming and demisting is discharged after thermal decomposition by the heat medium decomposer;

[0053] All structures and parts of the liquid sealing device involved in the utility model are made of 304 stainless steel.

Claims

1. An ozone oxidation tower terminal defoaming device, comprising an ozone oxidation tower, a liquid sealing device, a defoaming device, and a heat medium decomposer; characterized in that: The defoaming device is composed of a support leg, a defoaming device body, a spray pipe, a lower grid support, an S-shaped baffle, a stainless steel wire mesh demister, an upper grid support, an upper end mirror, a lower end mirror, and an ozone inlet pipe; The support legs are made of angle steel, welded to the defoaming device body, and evenly distributed around the defoaming device body. The height of the support legs must match the height of the spray outlet at the bottom. The defoaming device body is composed of a cylinder, an ozone outlet pipe, an upper head, a head flange, a sealing gasket, a cylinder flange, connecting bolts; a lower head, and a spray outlet pipe; The spray pipe is composed of a spray pipe end connection flange, a straight pipe section, an internal thread elbow, and an atomizing nozzle; The spray angle of the atomizing nozzle is 90°, and different specifications of DN20, DN25 and DN32 are selected according to the diameter of the cylinder; One end of the internal thread elbow is welded to the straight pipe section, and the other end is threadedly connected to the atomizing nozzle; The atomizing nozzle is selected to have a spray angle of 90°. The processing and manufacturing need to ensure that the nozzle is vertically downward, and the center line of the nozzle coincides with the center line of the cylinder; The distance between the horizontal center line of the spray pipe and the horizontal center line of the ozone inlet pipe is h3, which is 1 / 2 h1; The baffle is a double-layer S-shaped baffle; The wire mesh demister is a double-layer stainless steel wire mesh demister, which ensures the removal of water mist; The lower grid support and the upper grid support are welded from stainless steel flat steel into a "+" structure, the outer circumference is the same as the inner diameter Φ of the cylinder, and are horizontally welded inside the cylinder; The distance h1 between the lower grid support and the ozone inlet pipe is equal to the inner diameter Φ of the cylinder; The distance h2 between the upper grid support and the cylinder flange is equal to 2 / 3 of the inner diameter Φ of the cylinder; The upper end mirror can be used to observe the demisting effect, and the S-shaped baffle and the stainless steel wire mesh demisting device can be cleaned by spraying water in the disassembled state; The lower end viewing mirror can be used to observe the defoaming state, and the atomizing nozzle can be disassembled, replaced, and cleaned in the disassembled state; The ozone inlet pipe adopts a 30° bevel to increase the outlet area, and the bevel surface is within the 90° spray angle range at 30° upward; The cylinder, spray pipe, lower grille bracket, upper grille bracket, upper end mirror, lower end mirror, ozone air inlet pipe, cylinder flange, lower end cap, and spray water outlet are welded together; the upper end cap, end cap flange, and ozone outlet are welded together; after adding a sealing gasket between the flanges of the two welded bodies, they are connected as a whole by connecting bolts; The defoaming device needs to be placed in a system consisting of a front ozone oxidation tower, a liquid sealing device, a defoaming device, and a heat medium decomposer.

2. An ozone oxidation tower terminal defoaming device as claimed in claim 1, characterized in that: All structures and parts of the defoaming device are made of 304 stainless steel.

3. An ozone oxidation tower terminal defoaming device as claimed in claim 1 or 2, characterized in that: The height of the S-shaped baffle is 150 mm, the height of the stainless steel wire mesh demister is 100 mm; the width of the stainless steel flat steel is 40 mm.

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