A double-helix flow channel type ammonia water slag-discharging and oil-removing device

Abstract

The present invention belongs to the technical field of oil removal devices, and particularly relates to a double-helical flow channel type ammonia water slag discharging and oil removal device, which includes a housing. The slag-containing and oil-containing ammonia water inlet is communicated with a primary chamber. A solid phase outlet passing through the housing is provided at the bottom of the primary chamber. A three-phase liquid outlet communicated with a secondary chamber is provided near the top of the primary chamber. A circulating ammonia water phase outlet communicated with a tertiary chamber is provided near the middle of the secondary chamber. An underwater oil outlet passing through the housing is provided at the bottom of the secondary chamber. A residual ammonia water phase outlet is provided at the bottom of the tertiary chamber. An above-water oil outlet is provided near the top of the tertiary chamber. A double-helical flow channel is further provided in the primary chamber. The present invention realizes the on-line removal of solid phase slag, increases the oil removal rate and the stability of the oil removal effect, and solves the problems such as the difficulty of on-line slag discharging of the gas condensate of the semi-coke dry distillation furnace, the blockage of downstream devices caused by high oil content in ammonia water, and the large load of phenolic ammonia recovery treatment.

Description

Technical Field

[0001] The present invention belongs to the technical field of oil removal devices, and particularly relates to a double spiral flow channel type ammonia water slag discharging and oil removal device. Background Art

[0002] The technology of removing oil from surplus ammonia water has been relatively common in the chemical production field of metallurgical coke in coal chemical industry. The main processes are the porcelain tube separation + air flotation oil removal process or the liquid phase separator rectification process. The oil removal effect is relatively good, and the oil content can be reduced from 500 ppm to 50 ppm, and the oil removal rate is about 90%. However, the oil removal effect in the pretreatment field of semi-coke wastewater is less than satisfactory.

[0003] The reason is that the density of tar in the wastewater from the production of metallurgical coke in coal chemical industry is about 1180 kg / m3, and the density difference from water is large. Good results can be achieved by gravity sedimentation, and the tar content in the wastewater can be reduced to 500 ppm. While the density of petroleum in semi-coke wastewater is very close to that of water, the density of underwater oil is about 1020 kg / m3, and the density of oil on the water surface is about 960 kg / m3. Moreover, once pumped under pressure, it is very easy to emulsify, increasing the separation difficulty. At present, it is very difficult to achieve the expected effect by using static gravity sedimentation and liquid phase separators. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a double spiral flow channel type ammonia water slag discharging and oil removal device, which realizes the online removal of solid phase slag, increases the oil removal rate and the stability of the oil removal effect, and solves the problems such as the difficulty of online slag discharging of the condensate of semi-coke dry distillation furnace gas, the blockage of downstream devices caused by high oil content in ammonia water, and the large load of phenol-ammonia recovery treatment.

[0005] The specific technical solution adopted by the present invention is as follows:

[0006] A double spiral flow channel type ammonia water slag discharging and oil removal device includes a housing. A slag-containing and oil-containing ammonia water inlet is provided on the side wall of the housing. An inner chamber, a second chamber, and a third chamber are sequentially sleeved inside the housing from the inside to the outside. The slag-containing and oil-containing ammonia water inlet is communicated with the inner chamber. A solid phase outlet passing through the housing is provided at the bottom of the inner chamber. A three-phase liquid outlet communicating with the second chamber is provided near the top of the inner chamber. A circulating ammonia water phase outlet communicating with the third chamber is provided near the middle of the second chamber. An underwater oil outlet passing through the housing is provided at the bottom of the second chamber. A surplus ammonia water phase outlet is provided at the bottom of the third chamber. An oil-on-water outlet is provided near the top of the third chamber. A double spiral flow channel is further provided inside the inner chamber.

[0007] A hollow reflux pipe is vertically arranged at the center of the inner chamber. A diversion groove is spirally arranged from top to bottom around the axis of the reflux pipe on the periphery of the inner chamber. The open end of the diversion groove faces the reflux pipe. The diversion groove and the reflux pipe together form a double spiral flow channel.

[0008] The primary chamber has a conical structure. The solid phase outlet is located at the tip of the cone of the primary chamber. The input direction of the slag- and oil-containing ammonia water inlet is tangentially arranged with the inner wall of the primary chamber. The slag- and oil-containing ammonia water flows in a spiral manner to the bottom of the primary chamber. The solid phase of the slag- and oil-containing ammonia water is discharged along the solid phase outlet, and the liquid phase of the slag- and oil-containing ammonia water flows back to the top of the primary chamber and overflows into the secondary chamber along the three-phase liquid outlet.

[0009] In both the secondary chamber and the tertiary chamber, multiple groups of partition plates are arranged in a circular array centered on the axis. The fan-shaped chambers between adjacent partition plates in the secondary chamber form secondary static units. The tertiary chamber is formed into multiple fan-shaped tertiary static units corresponding to the secondary static units by means of the partition plates. The primary chamber, the multiple three-phase liquid outlets are connected to the secondary static units. The secondary static units are communicated with the tertiary static units through the circulating ammonia water phase outlet. An underwater oil outlet passing through the housing is arranged at the bottom of the secondary static unit. A residual ammonia water phase outlet is arranged at the bottom of the tertiary static unit. An above-water oil outlet is arranged near the top of the tertiary static unit.

[0010] A stop valve is arranged on the three-phase liquid outlet. Multiple three-phase liquid outlets are opened individually by means of the stop valve. After the three-phase liquid in the primary chamber fills the upper-level secondary static unit, the three-phase liquid is filled into the lower-level secondary static unit by means of the opening and closing of the stop valve.

[0011] A separation component is arranged in the tertiary static unit. The separation component includes multiple layers of corrugated plates stacked on top of each other. Multiple separation oil holes are arranged along the length direction of the wave crest of the corrugated plate, and multiple separation water holes are arranged along the length direction of the wave trough of the corrugated plate.

[0012] The separation oil holes of the lower-level corrugated plate are located between the separation oil holes and the separation water holes of the upper-level corrugated plate.

[0013] The circulating ammonia water phase outlet is located between the separation oil holes and the separation water holes of the lowermost corrugated plate.

[0014] A filter membrane layer is also arranged in the tertiary chamber. The filter membrane layer is located above the uppermost corrugated plate. The circulating ammonia water phase forms a filtration separation by means of the filter membrane layer.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. In the present invention, through the separation of the tertiary chamber, the solid phase slag and dissolved oil mixed in the ammonia water are separated to achieve continuous removal. The solid phase slag can be recycled back to the retort furnace as a batching material or used as boiler fuel to achieve efficient recycling of resources and energy, and at the same time avoid clogging downstream devices. The above-water oil and underwater oil separated from the liquid phase dissolved oil can be used as high-quality products, directly sold externally or used as raw materials for downstream tar deep processing.

[0017] In addition, through hierarchical separation and partitioned storage, the annular chamber improves the separation and static settlement time, and by integrating multiple-stage separation chambers, it saves the equipment floor space.

[0018] 2. The double-helix flow channel in the present invention utilizes swirl acceleration to adjust the flow state of the feed ammonia water, improves its separation performance, and promotes the solid-liquid separation effect.

[0019] 3. Through the design of innovative flow channels, device structure chambers, cone bottom inclination angles, etc., the overall device system in the present invention reduces the equipment investment by about 60% compared with the traditional ammonia water oil removal device.

[0020] 4. The present invention realizes the on-line removal of solid-phase slag, increases the oil removal rate and the stability of the oil removal effect, and achieves a breakthrough that the oil content after oil removal of the surplus ammonia water in the semi-coke industry is lower than 50 mg / L. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a structural schematic diagram of the present invention;

[0022] Figure 2 is a top view structural schematic diagram of the present invention;

[0023] Figure 3 is a structural schematic diagram of the separation component;

[0024] In the drawings, 1. housing, 2. inlet for ammonia water containing slag and oil, 3. primary chamber, 4. secondary chamber, 5. tertiary chamber, 6. solid-phase outlet, 7. three-liquid-phase outlet, 8. recycled ammonia water phase outlet, 9. underwater oil outlet, 10. surplus ammonia water phase outlet, 11. above-water oil outlet, 12. reflux pipeline, 13. partition board, 14. secondary static unit, 15. tertiary static unit, 16. stop valve, 17. corrugated plate, 18. separation oil hole, 19. separation water hole, 20. diversion groove, 21. filter membrane layer. DETAILED DESCRIPTION OF THE INVENTION

[0025] The present invention will be further described below in conjunction with the drawings and specific embodiments:

[0026] Specific embodiments, as shown in FIGS. 1-3, a double-helix flow channel type ammonia water slag-discharging and oil-removing device is provided in the present invention, including a housing 1. A slag- and oil-containing ammonia water inlet 2 is provided on the side wall of the housing 1. An inner chamber 3, a secondary chamber 4, and a tertiary chamber 5 are sequentially sleeved inside the housing 1 from the inside out. The slag- and oil-containing ammonia water inlet 2 is communicated with the inner chamber 3. A solid phase outlet 6 passing through the housing 1 is provided at the bottom of the inner chamber 3. A three-liquid phase outlet 7 communicated with the secondary chamber 4 is provided near the top of the inner chamber 3. A circulating ammonia water phase outlet 8 communicated with the tertiary chamber 5 is provided near the middle of the secondary chamber 4. An underwater oil outlet 9 passing through the housing 1 is provided at the bottom of the secondary chamber 4. A remaining ammonia water phase outlet 10 is provided at the bottom of the tertiary chamber 5. An above-water oil outlet 11 is provided near the top of the tertiary chamber 5. A double-helix flow channel is further provided in the inner chamber 3.

[0027] The density of petroleum in the semi-coke wastewater is very close to that of water. The density of underwater oil is about 1020 kg / m3, and the density of above-water oil is about 960 kg / m3. Moreover, once pressurized by a pump, it is extremely easy to emulsify, increasing the separation difficulty. Currently, it is very difficult to achieve the expected effect by using static gravity sedimentation and a liquid-phase separator.

[0028] Therefore, in the present invention, a multi-stage annular separation chamber is provided to realize the functions of primary solid-liquid separation, secondary liquid three-phase separation, and tertiary net oil slag-discharging and oil-removing. Under normal working conditions, the circulating ammonia water containing solid-phase slag and large-diameter oil droplets discharged from the ammonia water slag-discharging and oil-removing device enters the inner chamber 3 laterally from the upper part of the housing 1, and is centrifugally separated under the action of swirl along the double-helix flow channel. The solid-phase slag is deposited at the bottom of the device and discharged along the solid phase outlet 6. After the liquid phase reaches the bottom, it flows back to the top of the inner chamber 3 along the double-helix flow channel and overflows into the secondary chamber 4 along the three-liquid phase outlet 7. The three-liquid phase is statically separated into underwater oil, above-water oil, and the middle ammonia water in the secondary chamber 4. The underwater oil is discharged along the underwater oil outlet 9. The above-water oil and ammonia water enter the tertiary chamber 5 along the circulating ammonia water phase outlet 8. The above-water oil and ammonia water remove emulsified oil and dissolved oil in the tertiary chamber 5 through a membrane transition material and sufficient static time. The qualified ammonia water is discharged from the remaining ammonia water phase outlet 10 at the bottom of the tertiary chamber 5. The above-water oil and other light oils are discharged along the above-water oil outlet 11.

[0029] A hollow reflux pipe 12 is vertically arranged at the center of the inner chamber 3. A guide groove 20 is spirally arranged from top to bottom in a spiral shape around the axis of the reflux pipe 12 on the periphery of the inner chamber 3. The open end of the guide groove 20 faces the reflux pipe 12. The guide groove 20 and the reflux pipe 12 together form a double-helix flow channel. The circulating ammonia water containing solid-phase slag and large-diameter oil droplets forms a solid-liquid stratification through the double-helix flow channel. Among them, the solid phase is emptied along the bottom of the inner chamber 3, and the liquid phase flows back into the secondary chamber 4 along the hollow reflux pipe 12, avoiding secondary contact of the solid-liquid mixture in the double-helix flow channel.

[0030] The primary chamber 3 has a conical structure. The solid-phase outlet 6 is located at the tip of the cone of the primary chamber 3. The input direction of the slag- and oil-containing ammonia water inlet 2 is tangential to the inner wall of the primary chamber 3. The slag- and oil-containing ammonia water flows in a spiral to the bottom of the primary chamber 3. The solid phase of the slag- and oil-containing ammonia water is discharged through the solid-phase outlet 6, and the liquid phase of the slag- and oil-containing ammonia water flows back to the top of the primary chamber 3 and overflows into the secondary chamber 4 along the three-liquid-phase outlet 7. In the present invention, the double spiral flow channel can adjust the flow state of the feed ammonia water and improve its separation performance.

[0031] In the secondary chamber 4 and the tertiary chamber 5, a plurality of groups of partition plates 13 are arranged in a ring array centered on the axis. The fan-shaped chambers between adjacent partition plates 13 in the secondary chamber 4 form secondary static units 14. The tertiary chamber 5 is formed into a plurality of fan-shaped tertiary static units 15 corresponding to the secondary static units 14 by means of the partition plates 13. The primary chamber 3 and the plurality of three-liquid-phase outlets 7 are connected to the secondary static units 14. The secondary static units 14 are communicated with the tertiary static units 15 through the circulating ammonia water phase outlet 8. An underwater oil outlet 9 passing through the housing 1 is provided at the bottom of the secondary static unit 14. A residual ammonia water phase outlet 10 is provided at the bottom of the tertiary static unit 15. An above-water oil outlet 11 is provided near the top of the tertiary static unit 15.

[0032] A stop valve 16 is provided on the three-liquid-phase outlet 7. A plurality of three-liquid-phase outlets 7 are opened individually by means of the stop valve 16. After the three-liquid phase in the primary chamber 3 fills the upper-level secondary static unit 14, the three-liquid phase is filled into the lower-level secondary static unit 14 by opening and closing the stop valve 16.

[0033] The three-liquid phase in the secondary chamber 4 needs to be statically separated. However, in the actual production process for continuous production, during the process of discharging the new three-liquid phase into the three-liquid phase in the secondary chamber 4, it will cause disturbance to the three-liquid phase in the secondary chamber 4, thereby causing the underwater oil, above-water oil, and ammonia water that have been stratified to remix, reducing the separation rate of the three-liquid phase. Therefore, in the present invention, a plurality of secondary static units 14 and tertiary static units 15 are provided. During operation, first open one three-liquid-phase outlet 7, and the three-liquid phase in the primary chamber 3 will flow into the corresponding secondary static unit 14. After the secondary static unit 14 at this level is filled with the three-liquid phase, close this three-liquid-phase outlet 7, and then open the next three-liquid-phase outlet 7. The three-liquid phase in the primary chamber 3 will flow into the lower-level secondary static unit 14. In this way, the three-liquid phase in the upper-level secondary static unit 14 can be avoided from being disturbed, ensuring its separation effect. On the premise of ensuring the continuity of the entire oil removal process, the separation effect of the underwater oil in the three-liquid phase is improved.

[0034] A separation component is provided in the three-stage static unit 15. The separation component includes a plurality of corrugated plates 17 stacked one above the other. A plurality of separated oil holes 18 are provided along the length direction at the wave crests of the corrugated plates 17, and a plurality of separated water holes 19 are provided along the length direction at the wave troughs of the corrugated plates 17. In the present invention, in order to improve the separation effect of the oil on water and ammonia water, a separation component is additionally provided. When the circulating ammonia water phase containing the oil on water passes through the corrugated plates 17 from bottom to top, since the density of the oil on water is small, the oil on water will float upward through the separated oil holes 18 at the wave crests, while the ammonia water with a larger density will pass through the separated water holes 19 at the wave troughs and sink downward. Through the separation of the multiple corrugated plates 17, the separation effect between the oil on water and ammonia water can be improved.

[0035] The separated oil holes 18 of the corrugated plates 17 at the next stage are located between the separated oil holes 18 and the separated water holes 19 of the corrugated plates 17 at the previous stage. The arrangement of the positions of the separated water holes 19 and the separated oil holes 18 can prevent the oil on water passing through the separated oil holes 18 from entering the separated water holes 19 to cause mixing, and improve the separation effect.

[0036] The circulating ammonia water phase outlet 8 is located between the separated oil holes 18 and the separated water holes 19 of the corrugated plates 17 at the lowermost stage. With the aid of the separation component, the upper side of the separation component can be an oil-on-water layer, and the lower side of the separation component can be an ammonia water layer.

[0037] A filter membrane layer 21 is further provided in the three-stage chamber 5. The filter membrane layer 21 is located above the corrugated plates 17 at the uppermost stage, and the circulating ammonia water phase forms a filtration separation by means of the filter membrane layer 21. The filter membrane layer 21 is made of the high-molecular material polyvinylidene fluoride with good fiber-forming performance. Through the filter membrane layer 21, small oil droplets of emulsified oil can be promoted to form large oil droplets, and the micron-level oil droplets in the ammonia water can be deeply removed, thereby playing a better role in oil-water separation. The corrugated plates 17 perform a primary filtration on the circulating ammonia water, and the filter membrane layer 21 performs a secondary filtration on the circulating ammonia water, achieving a higher oil removal rate.

Claims

1. A double-helix flow channel type ammonia water slag and oil removal device, including a housing (1), wherein a slag and oil-containing ammonia water inlet (2) is arranged on the side wall of the housing (1), and it is characterized in that, Inside the said housing (1), a primary chamber (3), a secondary chamber (4), and a tertiary chamber (5) are successively sleeved from the inside out. The slag-containing and oil-containing ammonia water inlet (2) communicates with the primary chamber (3). A solid phase outlet (6) passing through the housing (1) is provided at the bottom of the primary chamber (3). A three-liquid phase outlet (7) communicating with the secondary chamber (4) is provided near the top of the primary chamber (3). A circulating ammonia water phase outlet (8) communicating with the tertiary chamber (5) is provided near the middle of the secondary chamber (4). An underwater oil outlet (9) passing through the housing (1) is provided at the bottom of the secondary chamber (4). A residual ammonia water phase outlet (10) is provided at the bottom of the tertiary chamber (5). An above-water oil outlet (11) is provided near the top of the tertiary chamber (5). A double spiral flow channel is further provided inside the primary chamber (3). A hollow reflux pipe (12) is vertically provided at the center of the primary chamber (3). Guide grooves (20) are spirally arranged from top to bottom in a circle around the primary chamber (3) with the axis of the reflux pipe (12) as the center. The open end of the guide groove (20) faces the reflux pipe (12). The guide groove (20) and the reflux pipe (12) together form a double spiral flow channel. Multiple groups of partition plates (13) are arranged in a ring array with the axis as the center inside both the secondary chamber (4) and the tertiary chamber (5). The fan-shaped chambers between adjacent partition plates (13) inside the secondary chamber (4) form secondary static units (14). The tertiary chamber (5) is formed into multiple fan-shaped tertiary static units (15) corresponding to the secondary static units (14) by means of the partition plates (13). The primary chamber (3) is connected to multiple groups of three-liquid phase outlets (7) to the secondary static units (14). The secondary static units (14) communicate with the tertiary static units (15) through the circulating ammonia water phase outlet (8). An underwater oil outlet (9) passing through the housing (1) is provided at the bottom of the secondary static unit (14). A residual ammonia water phase outlet (10) is provided at the bottom of the tertiary static unit (15). An above-water oil outlet (11) is provided near the top of the tertiary static unit (15). A stop valve (16) is provided on the three-liquid phase outlet (7). Multiple three-liquid phase outlets (7) are opened singly by means of the stop valve (16). After the three-liquid phase in the primary chamber (3) fills the upper-level secondary static unit (14), the three-liquid phase is filled into the lower-level secondary static unit (14) by opening and closing the stop valve (16).

2. The double-helix flow-channel type ammonia water slag-discharging and oil-removing device according to claim 1, characterized in that, The primary chamber (3) has a conical structure. The solid phase outlet (6) is located at the tip of the cone of the primary chamber (3). The input direction of the slag-containing and oil-containing ammonia water inlet (2) is tangentially arranged with the inner wall of the primary chamber (3). The slag-containing and oil-containing ammonia water spirally flows to the bottom of the primary chamber (3). The solid phase of the slag-containing and oil-containing ammonia water is discharged along the solid phase outlet (6). The liquid phase of the slag-containing and oil-containing ammonia water flows back to the top of the primary chamber (3) and overflows into the secondary chamber (4) along the three-liquid phase outlet (7).

3. The double-helix flow channel type ammonia water slag discharging and oil removing device according to claim 1, characterized in that, A separation component is provided in the three - stage static unit (15). The separation component includes a plurality of corrugated plates (17) arranged in a stacked manner. A plurality of separated oil holes (18) are provided along the length direction of the wave crests of the corrugated plates (17), and a plurality of separated water holes (19) are provided along the length direction of the wave troughs of the corrugated plates (17).

4. A double-helix flow channel type ammonia water slag discharging and oil removing device according to claim 3, characterized in that, The separated oil holes (18) of the next - stage corrugated plate (17) are located between the separated oil holes (18) and the separated water holes (19) of the upper - stage corrugated plate (17).

5. A double-helix flow channel type ammonia water slag discharging and oil removing device according to claim 3, characterized in that, The circulating ammonia - water phase outlet (8) is located between the separated oil holes (18) and the separated water holes (19) of the lowermost - stage corrugated plate (17).

6. The double-helix flow channel type ammonia water slag discharging and oil removing device according to claim 3, wherein A filter membrane layer (21) is further provided in the three - stage chamber (5). The filter membrane layer (21) is located above the uppermost - stage corrugated plate (17), and the circulating ammonia - water phase forms a filtration separation by means of the filter membrane layer (21).

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