Water floating and sinking integrated complete equipment for ethylene process

Abstract

The utility model provides ethylene process water floating and sinking integrated complete equipment which is characterized in that the front end of a floating and sinking integrated coalescence separator is connected with the input of an ethylene process water pipeline through a first water inlet pipe, the top of an internal corrugated coalescence inclined plate is connected with the output of a light oil pipeline, and the bottom is connected with the output of a heavy oil pipeline; the top of the first settling separation area is in output connection with a light oil pipeline, and the rear-end bottom is in input connection with a filter through a first water outlet pipe; the filter is provided with a back-flushing filter element; a second water inlet pipe connected with the output of the filter is arranged at the front end of the precise coalescer, a coalescence filter element and a second settling separation area are arranged in the precise coalescer, the top of the second settling separation area is connected with the output of the light oil pipeline, the middle bottom is connected with the output of the heavy oil pipeline, and the rear end bottom is connected with the output of the ethylene process water pipeline through a second water outlet pipe; the ethylene process water treatment capacity is improved, the working condition that the ethylene process water discharge capacity is greatly changed is borne, and long-term stable operation of the system is maintained.

Description

Technical Field

[0001] The utility model relates to the field of chemical oil-water separation, and in particular provides an ethylene process water floating and sinking integrated complete set of equipment. Background Art

[0002] In the chemical production process, the ethylene quench water tower is a garbage recycling station for the ethylene quench system. A large amount of reflux with various pollutants flows back into the quench water tower, which is an important part of the water balance and steam balance of the factory. The quench water is divided into two parts after leaving the quench water tower. Most of it returns to the quench water tower after heat exchange, and a small part is treated as process water and enters the process water stripping tower and then enters the dilution steam generating tower to generate low-pressure steam, which is then returned to the cracking furnace after heating. Therefore, the water in the quench water tower is recycled.

[0003] Poor process water treatment will seriously affect the operation of the dilution steam generator, and then affect the normal operation of the cracking furnace system, reducing the yield of ethylene. The traditional process water treatment process is a filter + coalescer with a filter element structure. The quenching system of ethylene contains very high levels of colloids, colloids, and solid particles in both the quenching oil and the quenching water. The high-precision pre-filter will soon be blocked. Once the colloid and coke penetrate the filter, the internal parts of the coalescer will be blocked and the coalescing effect will be lost. A large amount of oil containing solid cores will adhere to the packing of the process water stripping tower, shortening the maintenance cycle, and the oil will also enter the dilution steam generator, which will also affect the normal operation of the dilution steam generator. Utility Model Content

[0004] To this end, the utility model provides an integrated set of ethylene process water floating and sinking equipment to improve the treatment capacity of ethylene process water, capable of bearing working conditions with large changes in ethylene process water discharge volume, and maintaining long-term stable operation of the system.

[0005] In order to achieve the above-mentioned purpose, the utility model provides an integrated floating and sinking equipment for ethylene process water, including an integrated floating and sinking coalescing separator, a filter and a precision coalescing separator, wherein the front end of the integrated floating and sinking coalescing separator is connected to the input of the ethylene process water pipeline through a first water inlet pipe, and a corrugated coalescing inclined plate, a filter demulsification plate and a first sedimentation separation zone are sequentially arranged inside along the flow direction, the top of the corrugated coalescing inclined plate is connected to the output of the light oil pipeline, the bottom between the corrugated coalescing inclined plate and the filter demulsification plate is connected to the output of the heavy oil pipeline, the top of the first sedimentation separation zone is connected to the output of the light oil pipeline, and the bottom of the rear end is connected to the input of the filter through a first water outlet pipe; the filter is provided with a back-blowing filter element; the front end of the precision coalescing separator is provided with a second water inlet pipe connected to the output of the filter, and a coalescing filter element and a second sedimentation separation zone are sequentially arranged inside along the flow direction, the top of the second sedimentation separation zone is connected to the output of the light oil pipeline, the middle bottom is connected to the output of the heavy oil pipeline, and the bottom of the rear end is connected to the output of the ethylene process water pipeline through a second water outlet pipe.

[0006] Furthermore, a first lower liquid bag connected to the heavy oil pipeline is arranged at the bottom of the floating and sinking integrated coalescing separator between the corrugated coalescing inclined plate and the filtering and demulsifying plate, a first upper liquid bag connected to the light oil pipeline is arranged at the top of the corrugated coalescing inclined plate, and a second upper liquid bag connected to the light oil pipeline is arranged at the top of the first sedimentation separation zone.

[0007] Furthermore, an upper pneumatic regulating valve is respectively arranged between the first upper liquid bag, the second upper liquid bag and the light oil pipeline, and the first upper liquid bag and the second upper liquid bag are respectively connected to a field interface meter and a remote interface transmitter, and the field interface meter is interlocked with the upper pneumatic regulating valve to automatically control the light oil discharge;

[0008] The first lower liquid bag is connected to the bottom of the cylinder, and is provided with a field interface meter and a flow meter. The flow meter is interlocked with a lower pneumatic regulating valve to control the quantitative discharge of heavy oil.

[0009] Furthermore, the filter comprises two units and is arranged in parallel to the floating and sinking integrated coalescing separator and the precision coalescer, and each filter is independently controlled to select one of them to be in a filtering working state and the other to be in a standby state.

[0010] Furthermore, the top of the second sedimentation separation zone of the precision coalescer is connected to a third upper liquid bag connected to the light oil pipeline, and the bottom is provided with a second lower liquid bag connected to the heavy oil pipeline near the coalescing filter element.

[0011] Furthermore, the third upper liquid bag is connected to the top of the cylinder, and the third upper liquid bag is provided with a field interface meter and a remote interface transmitter, and the field interface meter is interlocked with a pneumatic regulating valve to discharge light oil according to the liquid level;

[0012] The second lower liquid bag is connected to the bottom of the cylinder, and the second lower liquid bag is provided with an on-site liquid level meter to discharge heavy oil regularly.

[0013] The beneficial effects of the provided ethylene process water floating and sinking integrated equipment are as follows:

[0014] 1. The corrugated coalescing inclined plate of the floating and sinking integrated coalescing separator is in a baffle shape, which is conducive to the collision of oil droplets during the flow process, improves the coalescence degree of oil droplets, thereby accelerating the floating of oil droplets and the sedimentation of solid impurities, effectively improving the oil-water separation effect;

[0015] 2. The two filters are arranged in parallel and controlled separately, realizing a one-in-use and one-in-standby working system. During the standby period, the backflushable filter element can be backwashed online, which reduces the replacement frequency and the workload on site;

[0016] 3. The coalescing filter element of the precision coalescer integrates multiple functions such as filtration, demulsification, coalescence and separation, which can completely separate the untreated oil droplets in the previous stage and effectively reduce the oil content in the ethylene process water;

[0017] 4. The complete set of equipment provided can carry ethylene process water with large displacement changes, recover the oil content in ethylene process water under normal production and accident conditions to the maximum extent, and maintain long-term stable operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an ethylene process water floating and sinking integrated equipment set provided according to an embodiment of the utility model;

[0019] Figure 2 It is a schematic diagram of the structure of the floating and sinking integrated coalescing separator and its connection provided according to an embodiment of the utility model;

[0020] Figure 3 A schematic diagram of the structure of the filter and the connection provided according to an embodiment of the utility model;

[0021] Figure 4 It is a structural schematic diagram of a precision coalescer and its connection provided according to an embodiment of the utility model.

[0022] Description of the accompanying drawings:

[0023] 1-floating and sinking integrated coalescing separator, 11-first water inlet pipe, 12-corrugated coalescing inclined plate, 13-filter demulsifier, 14-first sedimentation separation zone, 15-first water outlet pipe, 16-first upper liquid bag, 17-second upper liquid bag, 18-first lower liquid bag;

[0024] 2-filter, 21-back-blowing filter element;

[0025] 3-precision coalescer, 31-second water inlet pipe, 32-coalescing filter element, 33-second sedimentation separation zone, 34-second water outlet pipe, 35-third upper liquid bag, 36-second lower liquid bag;

[0026] 4-Process water pipeline;

[0027] 5- Heavy oil pipeline;

[0028] 6-Light oil pipeline;

[0029] 7-Industrial air ducts. DETAILED DESCRIPTION

[0030] The exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to be any limitation on the present disclosure and its application or use. The present disclosure can be implemented in many different forms and is not limited to the embodiments described herein.

[0031] like Figure 1 As shown, in the embodiment of the process water floating and sinking integrated equipment provided by the utility model, the equipment includes a floating and sinking integrated coalescing separator 1, two filters 2 and a precision coalescer 3. The structure of each part and the connection relationship between them are as follows:

[0032] Floating and sinking integrated coalescing separator:

[0033] like Figure 1 and Figure 2 As shown, the front end of the floating and sinking integrated coalescing separator 1 is connected to the input of the ethylene process water pipeline 4 through the first water inlet pipe 11, and the inside of the separator is provided with a corrugated coalescing inclined plate 12, a filtering and demulsifying plate 13 and a first sedimentation separation zone 14 in sequence along the flow direction, the top of the corrugated coalescing inclined plate 12 is connected to the output of the light oil pipeline 6, the bottom between the corrugated coalescing inclined plate 12 and the filtering and demulsifying plate 13 is connected to the output of the heavy oil pipeline 5, the top of the first sedimentation separation zone 14 is connected to the output of the light oil pipeline 6, and the bottom of the rear end is connected to the input of the filter 2 through the first water outlet pipe 15.

[0034] In some embodiments, a first partition and a second partition are arranged between the front end top of the cylinder of the floating and sinking integrated coalescing separator 1, the corrugated coalescing inclined plate 12 is installed between the first partition and the second partition, and the corrugated coalescing inclined plate 12 is arranged at intervals from the top of the cylinder, and the light oil pipeline 6 is connected to the top between the first partition and the second partition.

[0035] The corrugated coalescing inclined plate 12 is in a baffle shape and is arranged in multiple pieces at intervals along the flow direction. The first sedimentation and separation zone 14 is located in front of the outlet pipe and is provided with a third partition. In the specific implementation, the base material of the corrugated coalescing inclined plate 12 is made of stainless steel or aluminum alloy, and the surface is treated with double-repellent treatment. A high-temperature melting polymer silicone double-repellent surfactant material is used to make the corrugated coalescing inclined plate 12 neither oleophilic nor hydrophilic. The plate spacing is 30 mm, and it has a baffle shape to increase the surface area. During the flow of materials between the baffles, particles and floccules with a density greater than that of water collide and aggregate with each other, grow into large particles, and then settle to the bottom of the equipment under the action of gravity. In this process, solid particles such as coke, colloids, catalyst powders, etc. that are too heavy and heavy oil sink into the lower liquid bag and are continuously discharged.

[0036] At the same time, the small oil droplets in the process water also grow into large oil droplets in the collision and coalescence, the volume becomes larger and the buoyancy increases, the oil phases are similar and compatible, the oil group becomes larger and larger, the floating speed becomes faster and faster, and the light oil is finally separated from the upper oil bag. The corrugated coalescing inclined plate 12 can resist the impact of accidents, and recover the oil in normal production and accident conditions to the maximum extent. It has the function of inclined plate sedimentation, can remove solid particles, realize the separation of oil, water and solid phases, eliminate the impact on the filter demulsifier behind, and ensure that the filter demulsifier behind can operate for a long period of time.

[0037] The process water after the initial coagulation and separation enters the rear-stage filter demulsifier 13. The main purpose of the filter demulsifier 13 is to demulsify the small amount of oil remaining after the separation of the front-stage corrugated coagulation inclined plate 12, and then separate it. The filter demulsifier 13 consists of three sections. The functions of the first section are: filtering and demulsification, the second section: capturing and coagulating, and the third section: phase separation. Furthermore, the surfactants grafted on the filter demulsifier 12 are all oleophobic and hydrophobic, and have super oleophobic and super hydrophobic properties. The tiny oil droplets in the process water are further coagulated and separated in this area, and then pass through a longer first separation and sedimentation zone 14, where the light oil floats up and is discharged, and the water taken in the middle section is sent to the subsequent filter 2.

[0038] The bottom of the floating and sinking integrated coalescing separator 1 between the corrugated coalescing inclined plate 12 and the filtering and demulsifying plate 13 is provided with a first lower liquid bag 18 connected to the heavy oil pipeline 5, the top of the corrugated coalescing inclined plate 12 is provided with a first upper liquid bag 16 connected to the light oil pipeline 6, and the top of the first sedimentation separation zone 14 is provided with a second upper liquid bag 17 connected to the light oil pipeline 6.

[0039] The process water enters the front section of the floating and sinking integrated coalescing separator 1, and then enters the corrugated coalescing inclined plate 12 to start coalescing and separating. The corrugated coalescing inclined plate 12 is divided into countercurrent and downstream. The process water flows according to the set flow channel, and the dispersed phase oil droplets and solid particles are coalesced and separated. The separated heavy oil and large particle impurities are continuously discharged from the first lower liquid bag 18; the light oil and small particle impurities are discharged from the first upper liquid bag 16. Specifically, the first upper liquid bag 16 is connected to the top of the cylinder. The first upper liquid bag 16 is equipped with a field interface meter LG0001 and a remote interface transmitter. The field interface meter LT00001 interlocks the pneumatic control valve LV0001 to automatically adjust the discharge, 90% high liquid level alarm, 60% normal liquid level, 20% low liquid level alarm, and discharge to the light oil pipeline 6. The second upper liquid bag 17 is connected to the top of the cylinder. The second upper liquid bag is provided with a field interface meter LG0002 and a remote interface transmitter. The field interface meter LT00002 interlocks the pneumatic control valve LV0002 to automatically adjust the discharge. 90% is a high liquid level alarm, 60% is a normal liquid level, and 20% is a low liquid level alarm, and the discharge is to the light oil pipeline 6.

[0040] The process water after coalescence separation passes through the filter demulsifier plate 13, and the oil droplets remaining in the water are demulsified and discharged from the second upper liquid bag 17. Specifically, the first lower liquid bag 18 is connected to the bottom of the cylinder, and the first lower liquid bag is provided with a field interface meter LG0003, which is connected to a flow meter. According to the calculated values ​​of the process water flow rate and the solid content, the flow meter flow interlock pneumatic regulating valve FV0001 is set to perform continuous quantitative discharge, and the discharge is discharged to the heavy oil pipeline 5.

[0041] In the floating and sinking integrated coalescing separator 1, through the above-mentioned process flow, various suspended matter and solid particles as well as light and heavy hydrocarbons under abnormal production conditions can be effectively removed, and the removal rate of suspended particles can reach more than 90%, and the removal rate of free oil can reach more than 95%.

[0042] Filters:

[0043] like Figure 1 and Figure 3 As shown, the filter 2 is arranged between the sedimentation integrated condensation separator 1 and the precision condenser 3, and is used to remove some impurities such as solid particles, colloids, coke and oil clumps remaining in the process water. Because most of the solid impurities and light and heavy hydrocarbons have been removed from the process water after pretreatment in the sedimentation integrated condensation separator 1, the operating load of the filter 2 is relatively low. The replacement cycle will be relatively extended, and on-site maintenance and operation will be more convenient and easy. The process water enters the equipment from the lower end of the filter, and a back-blowing filter element is installed inside the equipment. The process water passes through the filter element from the outside to the inside, is discharged from the upper outlet of the equipment, and enters the precision condenser.

[0044] The filter 2 comprises two units and is arranged in parallel to the floating-sinking integrated coalescing separator 1 and the precision coalescing device 3. Each filter 2 is independently controlled to select one of them to be in a filtering working state and the other one to be in a standby state.

[0045] The back-blowing filter element 21 is installed in the middle of the cylinder through the filter element tube plate, and the input end of the filter 2 is arranged at the lower end of the cylinder, and the output end is arranged at the upper end of the cylinder. The back-blowing filter element 21 is a stainless steel wire mesh folded filter element with a filtration accuracy of 10μm, specifically a back-blowing stainless steel wire mesh folded filter element, and double-repellent treatment is performed, and it can be back-blown online with industrial wind and reused.

[0046] Each of the filters 2 is connected to an industrial air duct, the input end of the industrial air duct (7) is connected above the back-blowing filter element 21, and the output end is connected below the back-blowing filter element 21, so as to back-blow and clean the back-blowing filter element 21 online during standby. The filter 2 is operated with a full tank, and the inlet and outlet of the equipment are provided with a pressure transmitter to monitor the pressure difference before and after the equipment. When the pressure difference is greater than 0.15MPa, the filter 2 needs to be switched. After the filter 2 with a high pressure difference is drained, it is back-blown online by pulse using industrial air, and can be reused.

[0047] Precision coalescer:

[0048] like Figure 1 and Figure 4 As shown, the front end of the precision coalescer 3 is provided with a second water inlet pipe 31 connected to the output of the filter 2, and a coalescing filter element 32 and a second sedimentation separation zone 33 are sequentially arranged inside along the flow direction. The top of the second sedimentation separation zone 33 is connected to the output of the light oil pipeline 6, the middle bottom is connected to the output of the heavy oil pipeline 5, and the rear end bottom is connected to the output of the ethylene process water pipeline 4 through a second water outlet pipe 34.

[0049] The coalescing filter element 32 is supported in the cylinder by a filter element tube sheet. The coalescing filter element 32 is grafted with an oleophobic and hydrophobic surfactant. The process water enters the device from the second water inlet pipe 31, coalesces the filter element 32 from the inside to the outside, and is finally discharged from the upper outlet of the device through the second water outlet pipe 34 and sent to the rear process water stripping tower for treatment. A coalescing filter element is set in the front section of the interior of the precision coalescer 3 and is grafted with a high molecular weight silicone surfactant. When the process water flows through the coalescing filter element from the inside to the outside, the small amount of residual oil droplets are filtered, adsorbed, coalesced, and phase transformed. When the volume is large enough, they are desorbed from the surface of the filter element, and then enter the longer sedimentation and separation area in the rear section, and are discharged from the upper oil accumulation bag, thereby achieving the effect of oil-water separation. It is a terminal protection device.

[0050] The top of the second sedimentation separation zone 33 of the precision coalescer 3 is connected to a third upper liquid bag 35 connected to the light oil pipeline 6, and the bottom is provided with a second lower liquid bag connected to the heavy oil pipeline 5 near the coalescing filter element 32. The third upper liquid bag 35 is connected to the top of the cylinder, and the third upper liquid bag 35 is provided with a field interface meter LG0004 and a remote interface transmitter. LT00004 interlocks with a pneumatic regulating valve LV0004 to automatically adjust the discharge, 90% high liquid level alarm, 60% normal liquid level, 20% low liquid level alarm, and discharge to the light oil pipeline 6. The second lower liquid bag is connected to the bottom of the cylinder, and the lower liquid bag is provided with a field liquid level meter LG0005. When the operator inspects, the valve can be opened to discharge muddy sewage (with very little mud) according to the on-site situation, and it can be discharged regularly according to the situation.

[0051] Although the present invention has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An integrated floating and sinking equipment for ethylene process water, characterized by: It comprises a floating and sinking integrated coalescing separator (1), a filter (2) and a precision coalescer (3); The front end of the floating-sinking integrated coalescing separator (1) is connected to the input of the ethylene process water pipeline (4) through a first water inlet pipe (11), and a corrugated coalescing inclined plate (12), a filter demulsifier (13) and a first sedimentation separation zone (14) are sequentially arranged inside along the flow direction. The top of the corrugated coalescing inclined plate (12) is connected to the output of the light oil pipeline (6), and the bottom between the corrugated coalescing inclined plate (12) and the filter demulsifier (13) is connected to the output of the heavy oil pipeline (5). The top of the first sedimentation separation zone (14) is connected to the output of the light oil pipeline (6), and the bottom of the rear end is connected to the input of the filter (2) through a first water outlet pipe (15); The filter (2) is provided with a back-blowing filter element (21); The front end of the precision coalescer (3) is provided with a second water inlet pipe (31) connected to the output of the filter (2), and a coalescing filter element (32) and a second sedimentation separation zone (33) are sequentially provided inside along the flow direction. The top of the second sedimentation separation zone (33) is connected to the output of the light oil pipeline (6), the middle bottom is connected to the output of the heavy oil pipeline (5), and the rear end bottom is connected to the output of the ethylene process water pipeline (4) through a second water outlet pipe (34).

2. The ethylene process water floating and sinking integrated equipment according to claim 1, characterized in that: The floating and sinking integrated coalescing separator (1) is provided with a first lower liquid bag (18) connected to the heavy oil pipeline (5) at the bottom between the corrugated coalescing inclined plate (12) and the filtering demulsifier (13), a first upper liquid bag (16) connected to the light oil pipeline (6) is provided on the top of the corrugated coalescing inclined plate (12), and a second upper liquid bag (17) connected to the light oil pipeline (6) is provided on the top of the first sedimentation separation zone (14).

3. The ethylene process water floating and sinking integrated equipment according to claim 2, characterized in that: Upper pneumatic regulating valves are respectively provided between the first upper liquid bag (16), the second upper liquid bag (17) and the light oil pipeline (6); the first upper liquid bag (16) and the second upper liquid bag (17) are respectively connected to a field interface meter and a remote interface transmitter; the field interface meter interlocks the upper pneumatic regulating valve; The first lower liquid bag (18) is connected to the bottom of the cylinder. The first lower liquid bag (18) is provided with a field interface meter and a flow meter. The flow meter is interlocked with a lower pneumatic regulating valve.

4. The ethylene process water floating and sinking integrated equipment according to claim 1, characterized in that: The corrugated coalescing inclined plate (12) is installed between the first partition plate and the second partition plate. The corrugated coalescing inclined plate (12) is in a baffle shape and is arranged in plurality at intervals along the flow direction.

5. The ethylene process water floating and sinking integrated equipment according to any one of claims 1 to 4, characterized in that: The filters (2) include two units and are arranged in parallel on the floating and sinking integrated coalescing separator (1) and the precision coalescer (3), and each filter (2) is independently controlled.

6. The ethylene process water floating and sinking integrated equipment according to claim 1, characterized in that: The input end of the filter (2) is arranged at the lower end of the cylinder, and the output end is arranged at the upper end of the cylinder. The back-blowing filter element (21) is installed in the middle of the cylinder through a filter element tube plate.

7. The ethylene process water floating and sinking integrated equipment according to claim 1, characterized in that: Each filter (2) is connected to an industrial air pipeline (7), wherein the input end of the industrial air pipeline (7) is connected above the back-blowing filter element (21), and the output end is connected below the back-blowing filter element (21).

8. The ethylene process water floating and sinking integrated equipment according to claim 1 or 7, characterized in that: The top of the second sedimentation separation zone (33) of the precision coalescer (3) is connected to a third upper liquid bag (35) connected to a light oil pipeline (6), and the bottom is provided with a second lower liquid bag connected to a heavy oil pipeline (5) near the coalescing filter element (32).

9. The ethylene process water floating and sinking integrated equipment according to claim 8, characterized in that: The third upper liquid bag (35) is connected to the top of the cylinder, and the third upper liquid bag (35) is provided with a field interface meter and a remote interface transmitter, and the field interface meter is interlocked with a pneumatic regulating valve; The second lower liquid bag is connected to the bottom of the cylinder, and the second lower liquid bag is provided with an on-site liquid level meter.

10. The ethylene process water floating and sinking integrated equipment according to claim 1, characterized in that: The coalescing filter element (32) is supported in the cylinder through a filter element tube plate, and the coalescing filter element (32) is grafted with an oleophobic and hydrophobic surfactant.

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