CN114524482A - Integrated device and method for oil removal and solid removal of process water of ethyl propane dehydrogenation device - Google Patents
Integrated device and method for oil removal and solid removal of process water of ethyl propane dehydrogenation device Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
- C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/24—Separation of coarse particles, e.g. by using sieves or screens
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention provides a process water oil removal and solid removal integrated device and method for an ethyl propane dehydrogenation device, and the method comprises the following steps: the filter comprises one or more series-connected heterogeneous medium filter modules, a plurality of filter modules and a plurality of filter medium filtering modules, wherein each heterogeneous medium filter module comprises a vertical tank body, and a water distribution disc, a boiling-stopping baffle, a heterogeneous medium filter material layer and a water filtering cap assembly which are sequentially arranged in the vertical tank body from top to bottom; the compact combined integrated equipment comprises a self-adaptive rotational flow module, a woven fiber module and a reinforced gravity settling module, wherein a sewage outlet of the heterogeneous medium filtering module is connected to the compact combined integrated equipment; and the gas dissolving water backwashing system is used for backwashing and regenerating the heterogeneous medium filtering module. The integrated device has excellent effect on the coalescence removal of solid phase suspended particles, floating oil, dispersed and emulsified oil phases in incoming sewage and has strong material fluctuation resistance.
Description
Technical Field
The invention belongs to the field of chemical engineering environmental protection, and particularly relates to an integrated device and a method for removing oil and solid from process water of an ethylene propylene alkane dehydrogenation device, which are used for realizing efficient deep treatment of oily sewage.
Background
The ethyl-propyl alkane dehydrogenation device comprises units for raw material pretreatment, cracking, separation and the like, and products such as ethylene, propylene, carbon tetraolefin, carbon pentaolefin, cracking aromatic hydrocarbon, ethylene tar, hydrogen and the like are obtained by decomposing the raw materials through steam cracking, quenching and compression separation. The quenching system is an important component of an ethylene device, is directly connected with a cracking unit and a compression unit, has important influence on the performance of the ethylene device due to the good and bad operation, and is the key point of reconstruction and extension of the ethylene device. The production process of the quenching water system can produce quenching water and process water, generally adopts an ethylene device of a cracking furnace steam cracking process, dilute steam in cracking gas is condensed into water in a quenching water tower, the prior process of the quenching water tower is a gasoline fractionating tower, so that steam condensate water and heavy gasoline are obtained by washing and cooling the quenching water tower, partial materials on tower bottom liquid are sent to an oil-water separation settling tank through a baffle plate to separate and remove the heavy gasoline to obtain the process water, and the process water belongs to a typical w/o emulsion, and is relatively stable in system and cannot be separated by a simple mechanical means because the particle size is relatively small (0.1-10 mu m).
In order to achieve demulsification and separation of emulsified oily sewage, chemical agents are added to perform demulsification and external energy fields (such as electricity, heat, magnetic fields, electric fields and the like) are applied to accelerate the destabilization demulsification degree of the oily sewage, so that the oil phase is promoted to coalesce and grow to complete separation. The method has the problems of large dosage consumption, poor oil phase recoverability, secondary pollution and the like, and the selection of the medicament is changed according to the water quality, so the application range of the medicament is smaller; generally, the device for applying the external energy field is complex, low in efficiency, high in energy consumption, high in daily maintenance cost and difficult to popularize. By utilizing the wettability of the coalescence medium to the oil phase, the liquid film between two phases of the oil phase and the water phase can be broken, the demulsification is accelerated, and the oil phase is promoted to coalesce and grow up to complete the separation. Such a technique has a problem that the separation depth is insufficient due to the restriction of viscous streaming of the aqueous fluid.
Patent CN202022444045.1 discloses a high-efficiency integrated oily sewage treatment system, which can realize the treatment of oily sewage through the arrangement of components such as a cyclone oil remover, a plasma sewage purifier and a metal film purifier. When passing through a plasma sewage purifier, the oil is removed by means of chemical degradation through high-temperature pyrolysis of organic molecules or advanced oxidation under the action of free radicals, and the process has high energy consumption and high treatment cost, and does not meet the economic requirement.
Patent CN202010447513.2 discloses a coalescent degreaser for oil field sewage treatment, which increases the cross-sectional area of water flow channel between adjacent corrugated plates by thinning the thickness of the corrugated plates in the prior art, thereby greatly improving the sewage treatment capability; and under the prerequisite that sewage treatment efficiency does not reduce, under the condition that rivers passageway cross section keeps unchangeable promptly, the quantity greatly increased that lays of buckled plate to the area of contact of increase buckled plate and sewage has improved and has gathered oily efficiency and effect. The excessive single coalescence medium of the device easily causes the pressure drop to rise, the treatment efficiency is low, and the requirement of high-efficiency production is not met.
Therefore, the method and the device which can realize deep demulsification and high-efficiency oil-water separation of emulsified oily sewage and ensure low operation pressure drop and maintenance cost are urgently needed to be developed in the field.
Disclosure of Invention
Aiming at the problems of poor demulsification effect, low treatment efficiency and short operation period of a single physical method, the invention provides a method and a device for integrating oil removal and solid removal of process water of an ethylene-propylene-alkane dehydrogenation device.
The technical scheme of the invention is as follows: an oil and solid removing integrated device for process water of an ethylene propylene alkane dehydrogenation device comprises: one or more series-connected foreign medium filter modules comprise a vertical tank body, a first oil discharge port and a first sewage discharge port which are respectively arranged at the top and the bottom of the vertical tank body, and a water distribution disc, a boiling stop baffle, a foreign medium filter material layer and a water filter cap assembly which are sequentially arranged in the vertical tank body from top to bottom, wherein the water distribution disc is externally connected with a process water feed inlet, and the particle size and the density of a filter material of the foreign medium filter material layer are sequentially increased from top to bottom;
the compact combined integrated equipment comprises an adaptive cyclone module, a woven fiber module and a reinforced gravity settling module, wherein a first drain outlet of the heterogeneous medium filtering module is connected to the compact combined integrated equipment;
the gas dissolving water backwashing system is used for backwashing and regenerating the foreign medium filtering module and comprises a gas dissolving pump, a gas dissolving water buffer tank, a circulating pump and a fractal bubble generator, wherein the circulating pump is arranged between the gas dissolving water buffer tank and the fractal bubble generator.
Furthermore, the filter material layer of the anisotropic medium comprises three layers of filter materials, wherein the upper layer of filter material is a high molecular particle material or a soft filler with a lighter material, the particle size of the filter material is 0.3-1.5 mm, and the density is 1.2-2.0 g/cm2The thickness of the bed layer is 0.2-0.3 m; the material of the middle layer filter material is inorganic granular material, the size of the filter material granules is 1.5-2.4 mm, and the medium density is 1.8-3.1 g/cm2The thickness of the bed layer is 0.2-0.3 m; the material of the lower layer filter material is heavy large-size particles, the size of the filter material particles is 3-5 mm, and the medium density is 2.6-5.2 g/cm2And the thickness of the bed layer is 0.2-0.3 m.
Further, the diameter of the water distribution disc is 0.5-0.75 times of the diameter of the vertical tank body, and the distance between the water distribution disc and the tangent line of the upper part of the vertical tank body is 0.1-0.2 m; the distance between the boiling-stopping baffle and the foreign-shape medium filter material layer is 0.2-0.25 times of the height of the foreign-shape medium filter material layer.
The boiling stopping baffle plate can be a sieve mesh disc plate, a grating plate and the like, the sieve mesh disc plate can be composed of a pair of sieve mesh semi-circular plates, the outer side end of each sieve mesh semi-circular plate is respectively and rotatably connected to the side wall of the vertical tank body, and a horizontal baffle is horizontally arranged on the inner side wall of the vertical tank body to limit the rotation angle of the sieve mesh semi-circular plates to be less than or equal to 90 degrees.
Further, compact module combination integration equipment includes the horizontal tank body, locates the water inlet and the oil extraction package at horizontal tank body top both ends, the side of oil extraction package is equipped with the level gauge, locates the second oil drain at oil extraction package top, it is relative the oil extraction package is located the second drain of horizontal tank body bottom, self-adaptation whirl module, weave fibre module and reinforce gravity and subside the module and set gradually along the liquid flow direction in the horizontal tank is internal, the water inlet of the horizontal tank body with first drain is connected, the technology sewage warp after compact combination integration equipment handles the second drain is discharged.
Furthermore, the self-adaptive cyclone module comprises 2-3 self-adaptive cyclone multiphase separation devices connected in parallel, the reinforced gravity settling module comprises at least two corrugated plates, and the corrugated plates are tightly attached to the outer side end of the woven fiber module; the water inlet of the self-adaptive cyclone multi-phase separation equipment is connected with the water inlet of the horizontal tank body, the water phase separated by the self-adaptive cyclone multi-phase separation equipment enters the woven fiber module, and the oil phase enters the oil discharge bag.
The self-adaptive cyclone multiphase separation equipment comprises a main separation pipe, an auxiliary separation pipe and a main and auxiliary pipeline communicating pipe communicated with the main separation pipe and the auxiliary separation pipe, wherein 2-4 auxiliary centrifuge pipes are uniformly distributed around 1 main centrifuge pipe; the bottom of the main centrifugal tube is provided with a rotation-making blade, the top of the main centrifugal tube is provided with a light-phase diversion cone and an anti-impact cap, the side wall of the main centrifugal tube is provided with at least two tangential liquid outlets, and the rotation-making blade can change the flowing state of liquid flowing through the rotation-making blade from axial motion to rotary motion; the bottom of the auxiliary separation pipe is provided with a heavy phase separation cone, the top of the auxiliary separation pipe is provided with a light phase separation cone and an anti-impact cap, and the light phase drainage cones of the main separation pipe and the auxiliary separation pipe are communicated with the oil pocket.
Furthermore, the self-adaptive cyclone module is set to have the inner diameter ratio of the auxiliary separation cavity to the main separation cavity of 0.3-0.8 and the height ratio of 0.1-0.4, the length of the main and auxiliary pipeline communicating pipe is 0.3-0.6 times of the inner diameter of the inner cavity of the main separation pipe, and the inclined included angle of the light-phase diversion cone is 15-60 degrees; the ratio of the centrifugal acceleration of the liquid in the auxiliary centrifugal tube to the centrifugal acceleration of the liquid in the main centrifugal tube is (6-80): 1.
furthermore, the woven fiber module comprises at least two fiber coalescence bed layers, each fiber coalescence bed layer comprises a cylindrical seat and mixed woven fibers coated on the cylindrical seat, the outer diameter of the cylindrical seat is 0.85-0.95 times of the inner diameter of the horizontal tank body, and the length of the cylindrical seat is 0.2-0.25 times of the length of the horizontal tank body;
the mixed woven fiber is formed by mixing and weaving hydrophilic oleophobic fiber and oleophylic hydrophobic stainless steel wire, the diameter of the hydrophilic oleophobic fiber is 10-25 mu m, the diameter of the oleophylic hydrophobic stainless steel wire is 220-250 mu m, and the volume of the stainless steel wire in the whole bed layer is 8-10%.
Furthermore, the top of the gas-dissolved water buffer tank is provided with a backwashing gas-liquid inlet, and the side wall of the gas-dissolved water buffer tank is provided with a gas inlet, a backwashing water inlet and a gas-dissolved water outlet; the air dissolving pump is communicated with the backwashing water inlet and the air inlet, the parting bubble generator is arranged below the water filtering cap component in the vertical tank body, the bottom and the top of the vertical tank body are respectively provided with an air dissolving water inlet, the air dissolving water outlet is communicated with the air dissolving water inlet through the circulating pump, and air dissolving water enters the vertical tank body and then generates bubbles with uniform shapes through the parting bubble generator; and a backwashing gas-liquid outlet communicated with the backwashing gas-liquid inlet is formed in the top of the vertical tank body, and a material leakage prevention module is arranged at the top of the vertical tank body below the backwashing gas-liquid outlet.
The invention also provides a method for integrating oil removal and solid removal of the process water of the ethylene propylene alkane dehydrogenation device, which adopts the oil removal and solid removal integrated device and comprises the following steps:
(1) incoming material sewage enters the foreign medium filtering module through a process water inlet, enters the foreign medium filtering material layer after being rectified by the water distribution disc, is captured and coalesced by oil drops in the foreign medium filtering material layer, and realizes primary treatment on the oil drops and suspended matters after the suspended matters are intercepted and separated;
(2) the sewage after the treatment of preliminary deoiling of process opposite sex medium filter module gets into through first drain outlet compact module combination integration equipment realizes that the degree of depth that drips gets rid of under the effect of self-adaptation whirl module, woven fiber module and intensive gravity subsides the module in proper order.
Further, after the incoming sewage is subjected to oil removal and solid removal processes, the air-dissolved water backwashing system is used for backwashing and regenerating the heterogeneous medium filter material layer, and the method comprises the following steps:
(1) and injecting nitrogen into the heterogeneous medium filtering module, wherein the nitrogen uniformly distributes the water filtering cap components to expand the heterogeneous medium filtering material layer.
(2) Opening a backwashing water inlet, sucking backwashing clear water and nitrogen into a gas-dissolving water buffer tank under the negative pressure action of a gas-dissolving pump, and removing bubbles which are difficult to dissolve in water through the sedimentation action of the gas-dissolving water buffer tank;
(3) injecting the gas-dissolving water in the step (2) into the bottom of the vertical tank body, generating fractal bubbles with different sizes and uniform shapes by the gas-dissolving water through the fractal bubble generator, distributing the fractal bubbles through the water filtering cap component, and then carrying out preliminary backwashing on the filtering material layer of the heterogeneous medium;
(4) and stopping injecting nitrogen, only injecting backwashing clear water, stabilizing the bed of the heterogeneous medium filter material layer, and recovering the normal working state of the equipment.
Further, Q is a normal operation flow, the backflushing air quantity of the puffing bed layer in the step (1) in the backflushing process is 1Q-6Q, and the air inlet puffing time is 20-30 min; the flow rate of backwashing clear water in the step (2) is 1Q-5Q, the flow rate of backwashing nitrogen is 1Q-6Q, and the time of air-water combined backwashing is 20-60 min; the water inlet flow rate of the stable bed is 0.5-2Q, and the time for stable bed is 15-25 min.
The invention has the following beneficial results:
(1) the equipment provided by the invention is a large-size channel without a flowing dead zone, so that the accumulation of incoming suspended matters is prevented, the operating parameters can be flexibly adjusted and optimized according to the actual conditions of incoming materials, the coagulation and removal of solid suspended matter particles, floating oil, dispersed oil phase and emulsified oil phase in incoming material sewage are extremely good by using the heterogeneous medium filtering module and the compact combined integrated equipment in a matched manner, the material fluctuation resistance is strong, the operation elasticity is large, the continuous operation period is long, and the defects of an oil removal and solid removal integrated treatment technology of an industrial device are overcome.
(2) Compared with the prior art which depends on single physical methods such as chemical demulsification and air flotation and rotational flow, the invention has the advantages of compact structure, small occupied area, no chemical agent, little environmental pollution, integrated recovery of dirty oil resources and important significance in improving the carbon neutralization level in the oil refining chemical industry.
Drawings
FIG. 1 is a flow chart of an integrated oil and solid removal device and method for process water of an ethylene propylene alkane dehydrogenation device.
FIG. 2 is a schematic structural view of a heterogeneous media filtration module.
Fig. 3 is a schematic structural diagram of the compact module combination integrated equipment.
FIG. 4 is a schematic structural diagram of an adaptive cyclone multiphase separation device.
FIG. 5 is a schematic diagram of an integrated process flow in an embodiment in which the heterogeneous media filtration module primarily shows a media filter layer.
Wherein: 1. the special-shaped medium filter comprises 1-1 parts of a special-shaped medium filter module, 1-2 parts of a vertical tank body, 1-3 parts of a first oil discharge port, 1-4 parts of a water distribution disc, 1-5 parts of a special-shaped medium filter material layer, 1-6 parts of a water filter cap assembly, 1-7 parts of a boiling stop baffle, 1-8 parts of a dissolved air water inlet, 1-9 parts of a backwashing air-liquid outlet, 1-10 parts of a material leakage prevention module, 1-11 parts of a sight glass, 1-12 parts of a material inlet and a material outlet;
2. the device comprises compact combined integrated equipment, 2-1 parts of a horizontal tank body, 2-2 parts of a water inlet, 2-3 parts of an oil discharge bag, 2-4 parts of a second oil discharge port, 2-5 parts of a second sewage discharge port, 2-6 parts of a self-adaptive cyclone module, 2-6-1 parts of a main separation pipe, 2-6-2 parts of an auxiliary separation pipe, 2-6-3 parts of a main pipeline and auxiliary pipeline communicating pipe, 2-7 parts of a woven fiber module, 2-8 parts of a reinforced gravity settling module;
3. the device comprises a dissolved gas water backwashing system, 3-1 parts of a dissolved gas pump, 3-2 parts of a dissolved gas water buffer tank, 3-3 parts of a circulating pump, 3-4 parts of a parting bubble generator, 3-5 parts of a backwashing gas liquid inlet, 3-6 parts of a gas inlet, 3-7 parts of a backwashing water inlet, 3-8 parts of a dissolved gas water outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and fig. 2, the present embodiment provides an integrated apparatus for removing oil and solid in process water of an ethyl propane dehydrogenation apparatus, including:
the special-shaped medium filtering device comprises one or more serially connected special-shaped medium filtering modules 1, a water separating disc 1-4, a boiling stopping baffle 1-7, a special-shaped medium filter material layer 1-5 and a water filtering cap component 1-6, wherein the special-shaped medium filtering modules 1 are used for removing clear oil, emulsified oil drops with the particle size larger than 10 mu m and suspended matters to realize pretreatment of process water incoming materials; the water distribution disc 1-4 is externally connected with a process water feed inlet, the foreign medium filter material layer 1-5 is a single layer or a plurality of layers of filter materials made of different materials, and the particle size and the density of the filter materials are sequentially increased from top to bottom;
the compact type combined integrated equipment 2 is used for further treating sewage treated by the heterogeneous medium filtering module 1 to remove oil drops with the particle size of 3-10 mu m and comprises a horizontal tank body 2-1, a water inlet 2-2 and an oil discharge bag 2-3 which are arranged at two ends of the top of the horizontal tank body 2-1, a liquid level meter (not shown in the figure) for detecting the oil-water interface level is arranged at the side edge of the oil discharge bag 2-3, a second oil discharge port 2-4 is arranged at the top of the oil discharge bag 2-3, a second sewage discharge port 2-5 is arranged at the bottom of the horizontal tank body 2-1 relative to the oil discharge bag 2-3, and an adaptive cyclone module 2-6, a woven fiber module 2-7 and an enhanced gravity settling module 2-8 which are sequentially arranged in the horizontal tank body 2-1 along the liquid flowing direction, the water inlet 2-2 of the horizontal tank body 2-1 is connected with the first sewage outlet 1-3 of the vertical tank body 1-1, and the process water treated by the compact combined integrated equipment 2 is discharged through the second sewage outlet 2-5 of the horizontal tank body 2-1.
And the gas-dissolved water backwashing system 3 is used for backwashing and regenerating the heterogeneous medium filter material layers 1-5 of the heterogeneous medium filter module 1.
According to the invention, the gas-dissolved water backwashing system 3 comprises a gas-dissolved pump 3-1, a gas-dissolved water buffer tank 3-2, a circulating pump 3-3 and a parting bubble generator 3-4, wherein the top of the gas-dissolved water buffer tank 3-2 is provided with a backwashing gas-liquid inlet 3-5, the side wall is provided with a gas inlet 3-6, a backwashing water inlet 3-7 and a gas-dissolved water outlet 3-8, wherein:
the dissolved air pump 3-1 is communicated with a backwashing water inlet 3-7 and an air inlet 3-6 of the dissolved air water buffer tank 3-2, the parting bubble generator 3-4 is arranged below the water filtering cap component 1-6 in the vertical tank body 1-1, the bottom of the vertical tank body 1-1 is provided with a dissolved air water inlet 1-8, the dissolved air water outlet 3-8 is communicated with the dissolved air water inlet 1-8 through the circulating pump 3-3, and the dissolved air water enters the vertical tank body 1-1 and then generates bubbles with uniform shapes through the parting bubble generator 3-4;
the top of the vertical tank body 1-1 is provided with a backwash gas-liquid outlet 1-9 communicated with a backwash gas-liquid inlet 3-5, and the top of the vertical tank body 1-1 below the backwash gas-liquid outlet 1-9 is also provided with a material leakage prevention module 1-10 to prevent small-particle media from flowing out of the vertical tank body 1-1 along with backwash liquid. The backwashing gas-liquid outlet 1-9 is communicated with the backwashing gas-liquid inlet 3-5 to realize circular backwashing; the gas-dissolving water buffer tank 3-2 ensures that the backwashing water entering the foreign medium filtering module 1 has stable flow and uniform gas content so as to obtain better backwashing effect.
Further, the anisotropic medium filter material layers 1-5 comprise three layers of filter materials, wherein the upper layer of filter material comprises high polymer particle materials such as polytetrafluoroethylene and the like or soft filler with lighter materials such as anthracite and the like, the size of the filter material particles is 0.3-1.5 mm, and the medium density is 1.2-2.0 g/cm2The thickness of the bed layer is 0.2-0.3 m, and the functions of oil drop coalescence and separation and suspended matter filtration are mainly used; the material of the middle layer filter material comprises walnut shells, quartz sand, coal-based activated carbon and other inorganic granular materials, and the size of the filter material granules is 1.5-2.4mm, medium density of 1.8-3.1 g/cm2The thickness of the bed layer is 0.2-0.3 m, and the layer mainly takes deep adsorption and interception of suspended particles as a main part; the material of the lower layer filter material comprises heavy large-size particles such as serpentine and cobblestone, the size of the filter material particles is 3-5 mm, and the density of the medium is 2.6-5.2 g/cm2The thickness of the bed layer is 0.2-0.3 m, and the bed layer mainly plays a role in supporting the upper filter material layer.
Further, the diameter of the water distribution disc 1-4 is 1/2-3/4 d, wherein d is the diameter of the vertical tank body 1-1, and the cross-sectional flow velocity of the foreign media filled in the d correspondingly is 0.001-0.02 m/s; the distance between the water distribution disc 1-4 and the tangent line of the upper part of the vertical tank body 1-1 is 0.1-0.2 m. In the embodiment, the water distribution disc 1-4 is made of polyvinyl chloride and can be in a sieve pore disc spraying type, and the water distribution disc 1-4 enables incoming sewage to be uniformly distributed in the radial position in the vertical tank body 1-1.
Further, the distance between the boiling-stopping baffle 1-7 and the foreign-medium filter material layer 1-5 is 0.2-0.25 times of the height of the foreign-medium filter material layer 1-5, and the boiling-stopping baffle 1-7 is used for limiting the movement position of the filter material during a backwashing procedure.
Further, the boiling-stopping baffle plates 1-7 can be sieve pore round plates or sieve pore round plates consisting of a pair of sieve pore semi-circular plates. When the boiling-stopping baffle is a sieve pore disc, two ends of the sieve pore disc are fixed on the side wall of the vertical tank body 1-1 through fixing pieces; when the boiling stopping baffle is a sieve pore circular plate consisting of a pair of sieve pore semi-circular plates, the outer side end of each sieve pore semi-circular plate is respectively and rotatably connected to the side wall of the vertical tank body, and a horizontal stopper is horizontally arranged on the inner side wall of the vertical tank body so as to limit the rotation angle of the sieve pore semi-circular plates to be less than or equal to 90 degrees. Under the normal condition, the sieve mesh semicircle board is flagging vertically to be located naturally vertical in the vertical jar is internal, when the opposite sex medium filtering material layer is popped, under the pressure of the opposite sex medium filtering material layer, the medial extremity level of sieve mesh semicircle board upwards is the horizontality to the motion position of restriction filter material.
Furthermore, the water filtering cap assembly 1-6 comprises 5-8 water filtering caps which are uniformly distributed below the foreign-body medium filtering material layer 1-5, and the water filtering caps are used for filtering impurities in sewage and preventing foreign-body media in the tank from escaping. The material of the water filtering cap is 304 stainless steel, and the shape of the water filtering cap comprises a tower point shape, a cylindrical laminated type and a quincunx shape.
3-5 sight glasses 1-11 are arranged on the outer side wall of the vertical tank body 1-1 from top to bottom and used for observing the upper oil-water boundary position so as to discharge oil in time; the middle part of the vertical tank body 1-1 is provided with a material inlet and a material outlet 1-12 which are used for replacing the filler in the tank after the treatment capacity is reduced after long-time operation.
In the embodiment, as shown in fig. 3 and 4, the adaptive cyclone modules 2-6 comprise 2 parallel adaptive cyclone multiphase separation devices, which rapidly degas and deoil dispersed oil drops by using centrifugal force. The self-adaptive multi-phase cyclone separation equipment can adopt related structural design in a self-adaptive multi-phase integrated separation device and method disclosed by Chinese patent CN112387013A, the self-adaptive multi-phase cyclone separation equipment comprises a main separation pipe 2-6-1, an auxiliary separation pipe 2-6-2 and a main and auxiliary pipeline communicating pipe 2-6-3 communicated with the main separation pipe and the auxiliary separation pipe, 2-4 auxiliary separation pipes 2-6-2 are uniformly distributed around 1 main separation pipe 2-6-1, a heavy phase separation cone is arranged at the bottom of the auxiliary separation pipe 2-6-2, and a light phase separation cone and an anti-impact cap are arranged at the top of the auxiliary separation pipe. The water inlet of the self-adaptive cyclone multiphase separation equipment is connected with the water inlet 2-2 of the horizontal tank body 2-1, the light phase drainage cones of the main separation pipe 2-6-2 and the auxiliary separation pipe 2-3 are communicated with the oil discharge bag 2-3, the water phase separated by the self-adaptive cyclone multiphase separation equipment enters the woven fiber module 2-7, and the oil phase is discharged through the oil discharge bag 2-3.
Further, the weaving fiber module 2-7 comprises at least two fiber coalescence bed layers, each fiber coalescence bed layer comprises a cylindrical seat and mixed weaving fibers coated on the cylindrical seat, the outer diameter of the cylindrical seat is 0.85-0.95 times of the inner diameter of the horizontal tank body 2-1, and the length of the cylindrical seat is 0.2-0.25 times of the length of the horizontal tank body 2-1; the mixed woven fiber is formed by mixing and weaving hydrophilic oleophobic fiber and oleophylic hydrophobic stainless steel wire, the diameter of the hydrophilic oleophobic fiber is 10-25 mu m, the diameter of the oleophylic hydrophobic stainless steel wire is 220-250 mu m, and the volume of the stainless steel wire in the integral fiber coalescence bed layer is 8-10%.
Furthermore, the reinforced gravity settling module 2-8 comprises 2 or more corrugated plates, and the corrugated plates are tightly attached to the outer side ends of the woven fiber modules 2-7. In the embodiment, the corrugated plate is composed of 60% of polytetrafluoroethylene and 40% of monel, and small holes with the radius of 4mm are uniformly distributed on the surface of the corrugated plate; the reinforced gravity settling module 2-8 is used for accelerating settling separation of larger oil drops released by the woven fiber module 2-7 so as to reduce settling space of the equipment.
It should be noted that the oil discharge mode of the oil discharge port of each device in the invention can be intermittent discharge type or continuous discharge type, and when the oil discharge port is continuous discharge type, the oil phase flow of the oil discharge port is 0.3% -0.5% of the treatment capacity of the tank body in which the oil phase flow is located.
The invention also provides a method for integrating oil removal and solid removal of process water of the ethylene propylene alkane dehydrogenation device by using the device, which comprises the following steps:
(1) incoming material sewage enters the foreign medium filtering module 1 through a process water inlet, enters the foreign medium filtering material layer 1-5 after being rectified by the water distribution disc 1-4, is captured and coalesced by oil drops in the foreign medium filtering material layer 1-5, and realizes the primary treatment of the oil drops and suspended matters after the suspended matters are intercepted and separated;
(2) the sewage after the initial oil removal and solid removal treatment of the foreign medium filtering module 1 enters the compact module combination integrated equipment 2 through the first sewage discharge port 1-3, and the deep removal of oil drops is realized under the effects of the self-adaptive cyclone module 2-6, the woven fiber module 2-7 and the reinforced gravity settling module 2-8 in sequence.
After the oil removal and solid removal integrated device is used for treatment, the oil content in the water discharged from the second sewage discharge outlet 2-5 is not higher than 30ppm, and the content of suspended matters is not higher than 10 ppm.
In order to realize the reuse of the heterogeneous medium filter material layers 1-5, after the oil removal and solidification removal process of incoming sewage is finished, the gas-dissolving water backwashing system 3 is used for backwashing and regenerating the heterogeneous medium filter material layers 1-5, and the method comprises the following steps:
(1) opening a nitrogen inlet, injecting nitrogen into the anisotropic medium filter module 1 through a dissolved gas water inlet 1-8, and uniformly distributing the nitrogen through the water filtering cap components 1-6 to puff the anisotropic medium filter material layer 1-5;
(2) opening a backwashing water inlet 3-7, sucking backwashing clear water and nitrogen into a buffer tank under the negative pressure action of a dissolved air pump 3-1, and removing bubbles which are difficult to dissolve in water through the natural sedimentation action of the buffer tank;
(3) injecting gas-dissolving water for removing large bubbles into the bottom of the vertical tank body 1-1 through a gas-dissolving water inlet 1-8, generating fractal bubbles with different sizes and uniform shapes by the gas-dissolving water through the fractal bubble generator 3-4, and performing preliminary backwashing on the foreign medium filter material layer 1-5 after the fractal bubbles are distributed through the water filtering cap;
(4) and stopping backwashing nitrogen, only injecting backwashing clear water, stabilizing the bed of the foreign medium filter material layers 1-5, and recovering the normal working state of the equipment.
Further, Q is a normal operation flow, the backflushing air quantity of the puffing bed layer in the step 1 of the backflushing regeneration flow is 1Q-6Q, and the air inlet puffing time is 20-30 min; the flow rate of backwashing clear water in the step 2 is 1Q-5Q, the flow rate of backwashing nitrogen is 1Q-6Q, and the time of air-water combined backwashing is 20-60 min; the water inlet flow of the stable bed is 0.5Q-2Q, and the time for stable bed is 15-25 min.
Ningbo company adopts the oil removal and solid removal integrated device to treat sewage, and the specific conditions are as follows: the quenching water system in the ethylene production device of the company can generate quenching water and process water in the production process, the emulsification of the process water can cause difficulty in oil-water separation, and even the device can be stopped in severe cases. The oil content in the process water is high and the fluctuation is large, and the oil content is often as high as more than 1500 mg/L; the appearance is milky turbid, and the turbidity exceeds the measuring range. Through detection, the oil contained in the process water is mainly petroleum, and alkane, cyclane and aromatic hydrocarbon account for 95 percent of the total amount, and in order to reduce the adverse effect caused by sewage, the oil content of the discharged sewage is generally required to be less than 100 mg/L.
The device adopted by the process water treatment is shown in figure 5, three-level treatment is adopted, the first level and the second level are both the heterogeneous medium filtering module 1, and the structural parameters are as follows: the height of the vertical tank body 1-1 is 2.4m, the diameter is 0.8m, the thickness of the heterosexual medium filter layer 1-5 is 0.75m, polytetrafluoroethylene particle materials, quartz sand particle materials and goose warmer stone particles are sequentially selected from top to bottom, and the thickness of each medium layer is set to be 0.25 m. The three-level compact combined integrated equipment 2 is adopted, and the structural parameters are as follows: the internal diameter of horizontal jar of body 2-1 is 0.6m, length is 2m, self-adaptation whirl module 2-6 adopts two parallelly connected self-adaptation whirl heterogeneous splitter, reinforce gravity and subside module 2-8 and hug closely in weaving fibre module 2-7 rear, and it includes 4 layers of buckled plate, the buckled plate comprises 60% polytetrafluoroethylene and 40% monel, and the buckled plate surface equipartition is the aperture that the radius is 4mm, and the oil drips the come-up after the coalescence of being convenient for passes through.
The diluted steam in the ethylene production device of the company is condensed into water from the cooling effect of the upper-stage quenching water tower, the heavy gasoline is removed by an oil-water separation tank to generate process water, the process water is delivered to the device, and the flow of incoming materials is adjusted to be 1.2m by an inlet valve and a water outlet valve3And h, sequentially treating the process water by two series-connected heterogeneous medium filtering modules 1 and compact module combined integrated equipment 2, and recording the oil content of the water samples at a primary outlet, a secondary outlet and a tertiary outlet. The oil content of the first-level outlet sample is 324.26mg/L, the oil content of the inlet sample is 698.75mg/L as a reference, and the separation efficiency is 53.59%; the oil content of the secondary outlet is 195.34mg/L, the oil content of the primary outlet is taken as a reference, and the separation efficiency is 39.75 percent; the separation efficiency is 72.04% by taking the imported oil content as a reference; the oil content of the third outlet is 77.68mg/L, the oil content of the first outlet is used as a reference, and the separation efficiency is 76.04%; the separation efficiency was 88.89% with the oil content at the inlet as reference. Meanwhile, the change of turbidity of the water sample at the outlet of each stage of equipment is recorded, the inlet water sample is highly emulsified, the turbidity exceeds the measuring range, the turbidity of the sample at the first outlet is 35NTU, the turbidity at the second outlet is 25NTU, the turbidity at the first outlet is used as the reference, the reduction rate is 28.57%, the oil content at the third outlet is 8.63NTU, the turbidity at the first outlet is used as the reference, the separation efficiency is 75.34%, the turbidity at the second outlet is used as the reference, and the separation efficiency is 65.48%.
The device can remove the floating oil, emulsified oil and scum in the imported process water, the oil content of the treated sewage can be as low as 77.68mg/L, the turbidity is reduced to 8.63NTU, the treated water sample is in a transparent state, and the water sample is contrasted with the water sample at the process water inlet clearly, thereby achieving the expected target.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (11)
1. An oil and solid removing integrated device for process water of an ethylene propylene alkane dehydrogenation device is characterized by comprising the following components:
one or more series-connected foreign medium filter modules comprise a vertical tank body, a first oil discharge port and a first sewage discharge port which are respectively arranged at the top and the bottom of the vertical tank body, and a water distribution disc, a boiling stop baffle, a foreign medium filter material layer and a water filter cap assembly which are sequentially arranged in the vertical tank body from top to bottom, wherein the water distribution disc is externally connected with a process water feed inlet, and the particle size and the density of a filter material of the foreign medium filter material layer are sequentially increased from top to bottom;
the compact combined integrated equipment comprises an adaptive cyclone module, a woven fiber module and a reinforced gravity settling module, wherein a first drain outlet of the heterogeneous medium filtering module is connected to the compact combined integrated equipment;
the gas dissolving water backwashing system is used for backwashing and regenerating the foreign medium filtering module and comprises a gas dissolving pump, a gas dissolving water buffer tank, a circulating pump and a fractal bubble generator, wherein the circulating pump is arranged between the gas dissolving water buffer tank and the fractal bubble generator.
2. The integrated oil and solid removal device for process water of an ethylene propylene alkane dehydrogenation device according to claim 1, wherein the heterogeneous medium filter material layer comprises three layers of filter materials, wherein the upper layer of filter material is a high polymer particle material or a soft filler with a lighter material, the particle size of the filter material is 0.3-1.5 mm, and the density is 1.2-2.0 g/cm2The thickness of the bed layer is 0.2-0.3 m; the material of the middle layer filter material is nonThe particle material of the machine filter material has the particle size of 1.5-2.4 mm and the medium density of 1.8-3.1 g/cm2The thickness of the bed layer is 0.2-0.3 m; the material of the lower layer filter material is heavy large-size particles, the size of the filter material particles is 3-5 mm, and the medium density is 2.6-5.2 g/cm2And the thickness of the bed layer is 0.2-0.3 m.
3. The integrated oil and solid removal device for the process water of the ethylene propylene alkane dehydrogenation device according to claim 1, wherein the diameter of the water distribution disc is 0.5-0.75 times of the diameter of the vertical tank body, and the distance between the water distribution disc and the tangent line of the upper part of the vertical tank body is 0.1-0.2 m; the distance between the boiling-stopping baffle and the foreign-shape medium filter material layer is 0.2-0.25 times of the height of the foreign-shape medium filter material layer.
4. The oil and solid removal integrated device for the process water of the ethyl-propylene alkane dehydrogenation device according to claim 1, wherein the compact module combination integrated equipment comprises a horizontal tank body, a water inlet and an oil discharge bag which are arranged at two ends of the top of the horizontal tank body, a liquid level meter is arranged at the side edge of the oil discharge bag, a second oil outlet is arranged at the top of the oil discharge bag, and a second drain outlet is arranged at the bottom of the horizontal tank body opposite to the oil discharge bag; the self-adaptive cyclone module, the woven fiber module and the reinforced gravity settling module are sequentially arranged in the horizontal tank body along the liquid flowing direction, the water inlet of the horizontal tank body is connected with the first sewage discharge port, and process sewage treated by the compact combined integrated equipment is discharged through the second sewage discharge port.
5. The integrated oil and solid removal device for process water of the ethyl propane dehydrogenation device according to claim 4, wherein the adaptive cyclone module comprises 2-3 parallel adaptive cyclone multiphase separation devices, the enhanced gravity settling module comprises at least two corrugated plates, and the corrugated plates are tightly attached to the outer ends of the woven fiber modules; the water inlet of the self-adaptive cyclone multi-phase separation equipment is connected with the water inlet of the horizontal tank body, the water phase separated by the self-adaptive cyclone multi-phase separation equipment enters the woven fiber module, and the oil phase enters the oil discharge bag.
6. The integrated oil and solid removal device for the process water of the ethyl-propylene alkane dehydrogenation device according to claim 4, wherein the woven fiber module comprises at least two fiber coalescence beds, each fiber coalescence bed comprises a cylindrical seat and mixed woven fibers coated on the cylindrical seat, the outer diameter of the cylindrical seat is 0.85-0.95 times of the inner diameter of the horizontal tank body, and the length of the cylindrical seat is 0.2-0.25 times of the length of the horizontal tank body.
7. The integrated oil and solid removal device for the process water of the ethylene propylene alkane dehydrogenation device according to claim 6, wherein the mixed woven fiber is formed by mixing and weaving hydrophilic oleophobic fiber and oleophilic hydrophobic stainless steel wire, the diameter of the hydrophilic oleophobic fiber is 10-25 μm, the diameter of the oleophilic hydrophobic stainless steel wire is 220-250 μm, and the stainless steel wire occupies 8-10% of the whole bed layer.
8. The integrated oil and solid removal device for process water of the ethylene propylene alkane dehydrogenation device according to claim 1, wherein the top of the dissolved gas water buffer tank is provided with a backwash gas-liquid inlet, and the side wall of the dissolved gas water buffer tank is provided with a gas inlet, a backwash water inlet and a dissolved gas water outlet; the air dissolving pump is communicated with the backwashing water inlet and the air inlet, the parting bubble generator is arranged below the water filtering cap component in the vertical tank body, the bottom and the top of the vertical tank body are respectively provided with an air dissolving water inlet, the air dissolving water outlet is communicated with the air dissolving water inlet through the circulating pump, and air dissolving water enters the vertical tank body and then generates bubbles with uniform shapes through the parting bubble generator; the top of the vertical tank body is provided with a backwashing gas-liquid outlet communicated with the backwashing gas-liquid inlet, and the top of the vertical tank body below the backwashing gas-liquid outlet is provided with a material leakage prevention module.
9. A method for integrating oil removal and solid removal of process water of an ethylene propylene dehydrogenation device by adopting the oil removal and solid removal integrated device of any one of claims 1 to 8, which is characterized by comprising the following steps:
(1) incoming material sewage enters the foreign medium filtering module through a process water inlet, enters the foreign medium filtering material layer after being rectified by the water distribution disc, is captured and coalesced by oil drops in the foreign medium filtering material layer, and realizes primary treatment on the oil drops and suspended matters after the suspended matters are intercepted and separated;
(2) the sewage after the treatment of preliminary deoiling of process opposite sex medium filter module gets into through first drain outlet compact module combination integration equipment realizes that the degree of depth that drips gets rid of under the effect of self-adaptation whirl module, woven fiber module and intensive gravity subsides the module in proper order.
10. The method of claim 9, wherein after the incoming sewage is subjected to an oil and solid removal process, the air-dissolved water backwashing system is used for backwashing and regenerating the heterogeneous medium filter layer, and the method comprises the following steps:
(1) injecting nitrogen into the heterogeneous medium filtering module, wherein the nitrogen uniformly distributes through the water filtering cap component and then bulks the heterogeneous medium filtering material layer;
(2) opening a backwashing water inlet, sucking backwashing clear water and nitrogen into a gas-dissolving water buffer tank under the negative pressure action of a gas-dissolving pump, and removing bubbles which are difficult to dissolve in water through the sedimentation action of the gas-dissolving water buffer tank;
(3) injecting the gas-dissolving water in the step (2) into the bottom of the vertical tank body, generating fractal bubbles with different sizes and uniform shapes by the gas-dissolving water through the fractal bubble generator, distributing the fractal bubbles through the water filtering cap component, and then carrying out preliminary backwashing on the filtering material layer of the heterogeneous medium;
(4) and stopping injecting nitrogen, only injecting backwashing clear water, stabilizing the bed of the heterogeneous medium filter material layer, and recovering the normal working state of the equipment.
11. The method according to claim 10, wherein Q is a normal operation flow, the backflushing gas amount of the expanded bed layer in the step (1) in the backwashing process is 1Q-6Q, and the air inlet expanding time is 20-30 min; the flow rate of backwashing clear water in the step (2) is 1Q-5Q, the flow rate of backwashing nitrogen is 1Q-6Q, and the time of air-water combined backwashing is 20-60 min; the water inlet flow rate of the stable bed is 0.5-2Q, and the time for stable bed is 15-25 min.
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