Anti-scale ammonia distillation device for coking wastewater

Abstract

The utility model discloses an anti-scale ammonia distillation device for coking wastewater, which comprises an ammonia distillation tower and a plurality of tower plates, a clapboard is arranged at the lower part in the ammonia distillation tower, the internal space of the ammonia distillation tower is divided into an ammonia distillation cavity and a liquid inlet cavity by the clapboard, a hollow ball is arranged in the ammonia distillation cavity above each tower plate, a plurality of lower spray holes are processed on the lower hemispheroid of the ball, and a plurality of lower spray holes are processed on the lower hemispheroid of the ball. A hollow vertical shaft is arranged on the vertical center line of the ammonia distillation cavity, penetrates through the ball and is fixedly connected with the ball, a through hole is formed in the vertical shaft in the ball, the upper end of the vertical shaft extends out of the ammonia distillation cavity and then is in transmission connection with a motor, the lower end of the vertical shaft extends into the liquid inlet cavity, and the vertical shaft is movably and hermetically connected with the partition plate through a connecting piece; the bottom of the ammonia distillation cavity is communicated with an inlet of the filter through a liquid discharge pipe, an outlet of the filter is communicated with the liquid inlet cavity through a return pipe, and a pressure pump is arranged on the return pipe. In conclusion, the ammonia still has the advantages of being good in ammonia still effect, high in descaling efficiency and capable of reducing equipment maintenance frequency.

Description

Technical Field

[0001] The utility model relates to the technical field of coking wastewater treatment, in particular to an anti-scaling ammonia distillation device for coking wastewater. Background Art

[0002] Coking wastewater is industrial wastewater formed during the high-temperature dry distillation of coal, gas purification, and chemical product refining. It contains dozens of complex inorganic and organic compounds that are difficult to degrade, such as phenol, ammonia nitrogen, cyanide, benzene, pyridine, indole, and quinoline. It has complex components and is a toxic and harmful high-concentration organic wastewater, which is extremely difficult to treat. At present, when treating coking wastewater, an ammonia evaporation tower is often used for ammonia pretreatment. The ammonia evaporation tower generally uses water vapor as a heating agent to make the equilibrium vapor pressure of ammonia on the liquid surface of the coking wastewater greater than the partial pressure of ammonia in the heat carrier. The vapor and liquid phases are in countercurrent contact to carry out mass transfer and heat transfer, so that ammonia is gradually released from the coking wastewater, and a mixture of ammonia vapor and water vapor is obtained at the top of the tower, and the coking wastewater with ammonia removed is obtained at the bottom of the tower, which is convenient for subsequent biochemical treatment.

[0003] The content of total dissolved solids in coking wastewater is high, reaching 11000mg / L. In the process of ammonia evaporation, scale is inevitably precipitated and accumulated on the tower plate over time, changing the flow field of gas-liquid contact in the tower, affecting the working efficiency of mass transfer and heat transfer, and under-scale corrosion will also accelerate the scrapping of the tower plate, bringing some safety hazards. At the same time, in order to remove scale, the maintenance frequency of the equipment will be increased, which is time-consuming and labor-intensive, and reduces the working efficiency of the equipment. Although some descaling and anti-scaling structures have appeared in the market, there are often problems with poor descaling effects. The ammonia content in the discharged coking wastewater is still high, which still cannot meet people's needs for deammoniation and anti-scaling. Therefore, it is an objective need to develop an anti-scaling ammonia evaporation device for coking wastewater with good ammonia evaporation effect, high descaling efficiency, and the ability to reduce equipment maintenance frequency. Utility Model Content

[0004] The utility model aims to provide an anti-scaling ammonia distillation device for coking wastewater, which has good ammonia distillation effect, high descaling efficiency and can reduce the frequency of equipment maintenance.

[0005] The purpose of the utility model is achieved in this way, including an ammonia distillation tower and a plurality of tower plates arranged therein, a partition is arranged at the lower part of the ammonia distillation tower, the partition divides the internal space of the ammonia distillation tower into an ammonia distillation chamber and a liquid inlet chamber, a hollow sphere is arranged in the ammonia distillation chamber above each tower plate, a plurality of lower spray holes are processed on the lower hemisphere of the sphere, a hollow vertical shaft is arranged on the vertical center line of the ammonia distillation chamber, the vertical shaft penetrates the sphere and is fixedly connected to the sphere, a through hole is processed on the vertical shaft in the sphere, the upper end of the vertical shaft extends out of the ammonia distillation chamber and is transmission-connected to a motor, the lower end extends into the liquid inlet chamber, the vertical shaft and the partition are movably sealed and connected by a connecting piece, a filter is arranged on the outside of the ammonia distillation tower, the bottom of the ammonia distillation chamber is communicated with the inlet of the filter through a drain pipe, the outlet of the filter is communicated with the liquid inlet chamber through a reflux pipe, and a pressure pump is arranged on the reflux pipe.

[0006] Furthermore, the connecting piece includes a short section mounted on the vertical shaft, the outer wall of the short section is fixed on the partition, the lower end of the short section is provided with an end plate, the annular space between the short section and the vertical shaft is filled with sealing filler, and the upper end of the short section is provided with an end gland.

[0007] Furthermore, a vibrator is arranged on the outer wall of the ammonia distillation tower around each tower plate.

[0008] Furthermore, a nozzle is arranged in the lower spray hole, the nozzle is in a cone shape with a large inlet end and a small outlet end, and a spiral guide plate is arranged in the nozzle.

[0009] Furthermore, an upper spray hole is processed on the upper hemisphere of the sphere.

[0010] Furthermore, a cylinder is installed on the top of the ammonia distillation tower through a bracket, and the end of the piston rod of the cylinder is fixedly connected to the motor.

[0011] When the ammonia distillation device of the utility model needs to be descaled after running for a period of time, the motor is started, the motor drives the vertical shaft to rotate, the vertical shaft drives the sphere to rotate, the coking waste water after deammoniation treatment is discharged into the filter through the drain pipe, the coking waste water filters out dirt and other impurities in the filter, the pressure pump is started, the filtered coking waste water flows into the liquid inlet cavity through the reflux pipe, under the action of the pressure pump, the coking waste water continuously rushes into the liquid inlet cavity, generating a large water pressure, the water pressure presses the coking waste water into the internal space of the vertical shaft, and then flows into the cavity of the sphere through the through hole, and finally sprayed out from the lower spray hole under the action of the water pressure, the high-pressure water flow is sprayed onto the tower plate, and the dirt deposited on the tower plate is washed away under the impact of the water flow, so as to achieve the purpose of descaling and preventing scaling. In the above process, the dirt deposited on the tower plate is washed away by the impact of high-pressure water flow, the deposition of dirt is prevented, the flow field of gas-liquid contact in the tower is guaranteed, the working efficiency of mass transfer and heat transfer is ensured, and the descaling efficiency is good. In addition, the ball is in a rotating state, so that the position of water flow impacting on the tower plate is constantly changing, which can further improve the descaling efficiency of the tower plate. Without dirt, the problem of under-scale corrosion is avoided, the service life of the tower plate is extended, and the inspection frequency and maintenance cost of the equipment are greatly reduced. Secondly, the utility model adopts the coking wastewater after deammoniation as the descaling medium, does not introduce new medium, and does not The subsequent treatment volume of coking wastewater is increased to avoid the increase of the subsequent coking wastewater treatment load. When descaling the tower plate, there is no need to disassemble the tower plate or perform manual descaling. The descaling efficiency is high and the entire descaling process can be performed automatically, which saves time and effort. In addition, the water used for descaling in the utility model is the coking wastewater after deammoniation. While these coking wastewaters are used to flush away the dirt, they will also contact with the steam in the ammonia evaporation tower and then be deammonified again, which can further reduce the ammonia content in the treated coking wastewater, improve the deammoniation treatment effect of the device, and meet the deammoniation needs of enterprises for coking wastewater. In summary, the utility model has the advantages of good ammonia evaporation effect, high descaling efficiency, and can reduce the frequency of equipment maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0013] Figure 2 It is a schematic diagram of the structure of the ball 6 in the utility model;

[0014] Figure 3 It is a structural schematic diagram of the connecting member in the utility model;

[0015] In the figure: 1-ammonia distillation tower, 2-tower plate, 3-partition, 4-ammonia distillation chamber, 5-liquid inlet chamber, 6-ball, 7-vertical shaft, 8-motor, 9-filter, 10-reflux pipe, 11-short section, 12-sealing packing, 13-end gland, 14-vibrator, 15-nozzle, 16-spiral guide plate, 17-upper spray hole, 18-cylinder. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with the accompanying drawings, but the present invention is not limited in any way. Any changes or improvements made based on the present invention belong to the protection scope of the present invention.

[0017] like Figures 1 to 3 As shown, the utility model includes an ammonia still 1 and a plurality of tower plates 2 arranged therein. The ammonia still 1 is a prior art, and is generally provided with an ammonia outlet at the top, a coking wastewater inlet at the upper part, and a steam inlet at the lower part. The steam contacts the coking wastewater in reverse, so that the ammonia in the coking wastewater evaporates to achieve the purpose of deammoniation. A partition 3 is provided at the lower part of the ammonia still 1, and the partition 3 divides the internal space of the ammonia still 1 into an ammonia still chamber 4 and a liquid inlet chamber 5. A hollow sphere 6 is provided in the ammonia still chamber 4 above each tower plate 2, and a plurality of lower spray holes are processed on the lower hemisphere of the sphere 6. The vertical center line of the ammonia still chamber 4 is A hollow vertical shaft 7 is provided, which passes through the sphere 6 and is fixedly connected to the sphere 6. A through hole is processed on the vertical shaft 7 in the sphere 6. The upper end of the vertical shaft 7 extends out of the ammonia distillation chamber 4 and is transmission-connected to a motor 8, and the lower end extends into the liquid inlet chamber 5. The vertical shaft 7 and the partition 3 are movably and sealably connected through a connecting piece. A filter 9 is provided on the outside of the ammonia distillation tower 1. The filter 9 is an existing equipment and is used to filter out impurities such as dirt in the coking wastewater. The bottom of the ammonia distillation chamber 4 is connected to the inlet of the filter 9 through a drain pipe, and the outlet of the filter 9 is connected to the liquid inlet chamber 5 through a reflux pipe 10. A pressure pump is provided on the reflux pipe 10.

[0018] When the ammonia distillation device of the utility model needs to be descaled after running for a period of time, the motor 8 is started, the motor 8 drives the vertical shaft 7 to rotate, the vertical shaft 7 drives the ball 6 to rotate, the coking waste water after deammoniation treatment is discharged into the filter 9 through the drain pipe, the dirt and other impurities therein are filtered out of the coking waste water in the filter 9, the booster pump is started, the filtered coking waste water flows into the liquid inlet chamber 5 through the reflux pipe 10, under the action of the booster pump, the coking waste water continuously rushes into the liquid inlet chamber 5, generating a large water pressure, the water pressure presses the coking waste water into the internal space of the vertical shaft 7, and then flows into the cavity of the ball 6 through the through hole, and finally sprayed out from the lower spray hole under the action of the water pressure, the high-pressure water flow is sprayed onto the tower plate 2, and the dirt deposited on the tower plate 2 is washed away under the impact of the water flow, so as to achieve the purpose of descaling and preventing scaling. In the above process, the dirt deposited on the tower plate 2 is washed away by the impact of high-pressure water flow, the deposition of dirt is prevented, the flow field of gas-liquid contact in the tower is ensured, the working efficiency of mass transfer and heat transfer is ensured, and the descaling efficiency is good. In addition, the ball 6 is in a rotating state, so that the position of the water flow impacting the tower plate 2 is constantly changing, which can further improve the descaling efficiency of the tower plate 2. Without dirt, the problem of under-scale corrosion is avoided, the service life of the tower plate 2 is extended, and the maintenance frequency and maintenance cost of the equipment are greatly reduced. Secondly, the utility model adopts the coking wastewater after deammoniation as the descaling medium, and does not introduce new medium. It does not increase the subsequent treatment volume of coking wastewater, thus avoiding the increase of the subsequent coking wastewater treatment load. When descaling the tower plate 2, there is no need to disassemble the tower plate 2, nor is manual descaling required. The descaling efficiency is high, and the entire descaling process can be carried out automatically, which saves time and effort. In addition, the water used for descaling in the utility model is the coking wastewater after deammoniation. While these coking wastewaters are used to flush away the dirt, they will also come into contact with the steam in the ammonia evaporation tower 1, and then be deammonified again, which can further reduce the ammonia content in the treated coking wastewater, improve the deammoniation treatment effect of the device, and meet the company's deammoniation needs for coking wastewater.

[0019] Preferably, the connecting piece includes a short section 11 sleeved on the vertical shaft 7, the outer wall of the short section 11 is fixed on the partition 3, the lower end of the short section 11 is provided with an end plate, the annular space between the short section 11 and the vertical shaft 7 is filled with a sealing filler 12, and the upper end of the short section 11 is provided with an end gland 13. A movable sealing connection is formed between the sealing filler 12 and the vertical shaft 7, the vertical shaft 7 can move up and down and rotate freely, and at the same time, there is also a good sealing effect between the vertical shaft 7 and the sealing filler 12, which can prevent the coking wastewater from directly overflowing from the liquid inlet chamber 5 and flowing into the interior of the ammonia distillation chamber 4. In actual use, other forms of movable sealing structures can also be selected according to actual conditions, as long as they can meet the use requirements.

[0020] A vibrator 14 is provided on the outer wall of the ammonia still 1 around each tray 2. The vibrator 14 can generate vibration and transmit it to the tray 2, thereby driving the vibration of the dirt on the tray 2, so that the dirt is shaken off the tray 2. The vibrator 14 assists the impact of the water flow, improves the cleaning effect of the dirt, and prevents the deposition of the dirt.

[0021] A nozzle 15 is arranged in the lower spray hole. The nozzle 15 is in a cone shape with a large inlet end and a small outlet end. A spiral guide plate 16 is arranged in the nozzle 15. The nozzle 15 is in a cone shape. When the water flows from the inlet end to the outlet end, the water flow rate will increase due to the reduction of the effective flow cross-sectional area, thereby increasing the impact force of the water flow on the surface of the tower plate 2, and the dirt can be removed more thoroughly. At the same time, under the action of the spiral guide plate 16, the water flow is in a rotating state when it is sprayed out, and when it touches the tower plate 2, it has greater penetration and impact force, further improving the dirt removal effect on the tower plate 2.

[0022] An upper spray hole 17 is processed on the upper hemisphere of the sphere 6, and the upper spray hole 17 is located on the upper hemisphere of the sphere 6. Part of the coking wastewater in the sphere 6 is sprayed upward from the upper spray hole 17, and the sprayed water flow will impact the lower surface of the partition 3 above the sphere 6, which has three functions: first, the impact of the water flow can dredge the openings on the tower plate 2 to prevent the openings on the tower plate 2 from being blocked; second, it can wash away the dirt on the lower surface of the tower plate 2; third, when the water flow impacts the tower plate 2, countless irregular splashes will be formed, and the formation of these splashes can increase the contact area between the coking wastewater and the water vapor, thereby improving the deammoniation effect of the coking wastewater.

[0023] The top of the ammonia distillation tower 1 is provided with a cylinder 18 through a bracket, and the piston rod end of the cylinder 18 is fixedly connected to the motor 8. The cylinder 18 can drive the motor 8 and the vertical shaft 7 to move up and down in sequence through the piston rod, and then drive the ball 6 to move up and down. When the utility model is in operation, the coking wastewater is sprayed from the lower spray hole on the lower hemisphere of the ball 6, and the water flow direction sprayed from the lower spray hole is along the radial direction of the ball 6, so that all the sprayed water flows present a cone with a small upper port and a large lower port as a whole. When the ball 6 moves down, the distance between the ball 6 and the tower plate 2 below it is shortened, so the diameter and area of ​​the cone lower port will be reduced, but the impact force of the water flow will be increased, which can better wash away the dirt. On the contrary, when the ball 6 moves up, the distance between the ball 6 and the tower plate 2 below it is lengthened, so the diameter and area of ​​the cone lower port will be increased, which can expand the impact area of ​​the water flow. In actual use, the ball 6 can be in a rotating and up-and-down moving state at the same time, or at a fixed height, which can be determined according to actual needs as long as it can achieve a better anti-scaling and descaling effect.

Claims

1. An anti-scaling ammonia distillation device for coking wastewater, comprising an ammonia distillation tower (1) and a plurality of tower plates (2) arranged inside the tower, characterized in that A partition (3) is arranged at the lower part of the ammonia distillation tower (1), and the partition (3) divides the internal space of the ammonia distillation tower (1) into an ammonia distillation chamber (4) and a liquid inlet chamber (5). A hollow sphere (6) is arranged in the ammonia distillation chamber (4) above each tower plate (2), and a plurality of lower spray holes arranged along the radial direction of the sphere (6) are processed on the lower hemisphere of the sphere (6). A hollow vertical shaft (7) is arranged on the vertical center line of the ammonia distillation chamber (4), and the vertical shaft (7) passes through the sphere (6) and is fixedly connected to the sphere (6). The sphere (6) A through hole is machined on the vertical shaft (7) inside the ammonia distillation tower (1). The upper end of the vertical shaft (7) extends out of the ammonia distillation chamber (4) and is transmission-connected to a motor (8). The lower end of the vertical shaft (7) extends into the liquid inlet chamber (5). The vertical shaft (7) and the partition plate (3) are movably and sealably connected via a connecting piece. A filter (9) is arranged on the outside of the ammonia distillation tower (1). The bottom of the ammonia distillation chamber (4) is connected to the inlet of the filter (9) via a drain pipe. The outlet of the filter (9) is connected to the liquid inlet chamber (5) via a reflux pipe (10). A pressure pump is arranged on the reflux pipe (10).

2. The anti-scaling ammonia distillation device for coking wastewater according to claim 1, characterized in that The connecting member comprises a short section (11) sleeved on the vertical shaft (7), the outer wall of the short section (11) being fixed on the partition (3), an end plate being arranged at the lower end of the short section (11), a sealing filler (12) being filled in the annular space between the short section (11) and the vertical shaft (7), and an end gland (13) being arranged at the upper end of the short section (11).

3. The anti-scaling ammonia distillation device for coking wastewater according to claim 1, characterized in that A vibrator (14) is provided on the outer wall of the ammonia distillation tower (1) around each tower plate (2).

4. The anti-scaling ammonia distillation device for coking wastewater according to claim 1, characterized in that A nozzle (15) is arranged in the lower spray hole. The nozzle (15) is in a conical shape with a large inlet end and a small outlet end. A spiral guide plate (16) is arranged in the nozzle (15).

5. The anti-scaling ammonia distillation device for coking wastewater according to claim 1, characterized in that An upper spray hole (17) is machined on the upper hemisphere of the sphere (6).

6. The anti-scaling ammonia distillation device for coking wastewater according to claim 1, characterized in that A cylinder (18) is mounted on the top of the ammonia distillation tower (1) via a bracket, and the end of the piston rod of the cylinder (18) is fixedly connected to the motor (8).

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