CN102745771B - Multi-phase flow assembly type sealing coalescence oil removing apparatus - Google Patents

Abstract

A multi-phase flow assembled closed coalescence degreasing device suitable for the treatment of conventional sewage and low-polymer sewage in oilfields. , mud discharge system, oil collection system, etc.; the sewage enters the water distribution section in the tank from the water inlet pipe of the multiphase flow assembly type closed coalescence degreasing device, and then enters the first, second, and third coalescence sections in sequence, each The coalescing section of the section is filled with coalescing packing; the effluent of the coalescing section enters the separation section, and the separation section is filled with inclined plates with adjustable spacing; the effluent of the separation section enters the rectification section, and then enters the water collection section, the rectification section and the water collection section The section is separated by a baffle, and the water collection section is provided with a water outlet pipe, and one end of the water outlet pipe is provided with a water collection bell mouth, and the water is discharged from the water outlet through the water collection bell mouth. The invention has high oil removal efficiency, good effluent quality, small footprint, compact structure design, and is convenient for automatic control; the internal components adopt an assembled structure, which is convenient for disassembly and maintenance.

Description

Multiphase Flow Assembly Type Sealed Coalescing Oil Removal Device

technical field

The invention relates to a purification device for oilfield conventional sewage and low-polymer sewage that integrates coalescence and inclined plate separation processes, specifically a multi-phase oil removal technology that integrates coalescence degreasing, inclined plate settling degreasing and suspended solids technology Flow-assembled closed coalescing degreasing device is suitable for the purification treatment of conventional sewage and low-polymer sewage in the process of oilfield production and development.

Background technique

The present invention is developed to solve many problems such as aeration of water out of a large tank of a sewage station, difficulty in collecting oil, poor sludge discharge effect, large tank body, long residence time, and low treatment efficiency. The purpose is to further improve the efficiency of conventional sewage. and low poly-containing sewage treatment efficiency, improve the treatment effect, and reduce the difficulty of operation and management.

Contents of the invention

The object of the present invention is to provide a multi-phase flow assembly type airtight coalescing and degreasing device, which overcomes the deficiencies in the prior art of the oil field. In order to meet the treatment requirements of aggregate-containing sewage, the efficiency of the sewage treatment process has been improved by means of internal structure innovation, material upgrade, sedimentation flow optimization, coalescence type improvement, and inclined plate spacing adjustment of the traditional oil-water separator. The application range of the device is widened. Under the conditions of no chemical addition and incoming water with oil content of 1000 mg/L, the oil content in the effluent water is within 100 mg/L, and the oil removal rate is over 90%.

Technical scheme of the present invention is realized in the following manner:

The invention is mainly composed of a tank body, a water distribution chamber, a coalescence section, a separation section, a rectification section, a water collection chamber, a mud flushing system, a mud discharge system, and an oil collection system. It is characterized in that the oval head on the left side of the tank body A water inlet pipe is set at the center, and the water inlet pipe is connected to the water supply pipeline other than the multiphase flow assembled closed coalescing oil removal device; a water outlet pipe is installed on the right side of the tank or at the center of the oval head, and the water outlet pipe is assembled with the multiphase flow It is connected to the water pipeline other than the type airtight coalescing oil removal device; a water distribution chamber is provided in the tank near the side of the water inlet pipe; behind the water distribution chamber, there are a first-stage coalescence section, a second-stage coalescence section, and a third-stage coalescence section. Stage coalescing section, separation section, rectifying section, water collecting chamber, the rectifying section and water collecting chamber are separated by a baffle, and the baffle is welded on the tank; the secondary coalescing section and the tertiary coalescing There is a set of mud flushing coils under the section and the separation section, and the mud flushing coils are connected to the mud flushing pumps outside the multiphase flow assembled closed coalescing oil removal device through the mud flushing pipes; there are four mud flushing coils at the bottom of the tank. The sludge collection hopper, the sludge collected by the sludge collection hopper is connected with the sludge system outside the multiphase flow assembled closed coalescence degreasing device through the sludge discharge pipe; there are three oil collection ports and three filling ports on the top of the tank body , The oil collection port adopts an open design, and oil and gas can be discharged at the same time. The dirty oil collected by the oil collection port is connected to the dirty oil collection system outside the multiphase flow assembled closed coalescence oil removal device through the oil collection pipe.

After the water inlet pipe goes deep into the tank body, it adopts a rotary deflection structure. The outlet of the water inlet pipe faces the side of the oval head, and the outlet water enters the water distribution chamber, which is connected to the first-stage coalescing section; the outlet pipe is connected to the water collection chamber. The end of the water outlet pipe on one side of the water cavity is provided with a water collecting bell mouth.

Each coalescing section is equipped with a horizontal wave-flow coalescing packing, and the coalescing packing adopts an assembled structure, which is convenient for disassembly and maintenance; The packing width of the joint section is the same, and the packing width of the third-stage coalescing section is wider than that of the first-stage and second-stage packing; the coalescence section ensures that most of the dispersed oil and emulsified oil in the water are coalesced to form large oil droplets, thereby accelerating the floating separation ;The stainless steel sloping plate packing in the separation section is arranged with a high slope and small spacing lateral flow structure. The sloping plate spacing can be adjusted according to the water quality characteristics. The sloping plate packing adopts an assembled structure, which is convenient for disassembly and maintenance; The tank body is sealed and integrated, and there is a mud chamber in the middle. The height of the packing in the separation section is lower than that of the coalescence section, and the width of the packing is wider than that of the coalescence section. The separation section adopts a low surface load oil-water gravity separation method to ensure oil, water and mud rapid phase separation.

The connecting structure of the coalescing section, the separating section and the sludge system ensures that the generated sludge is deposited at the bottom of the tank; the mud flushing nozzles are evenly distributed under each group of mud flushing coils, and the mud flushing is realized automatically by adding an external power source; The mud collecting hopper is a cylindrical structure, the lower end of the cylinder is an oval head, and a mud discharge port is provided at the bottom of the oval head, and the mud discharge port is connected to the mud discharge pipe through a flange, and the sludge collected by the mud collecting hopper The sludge discharge pipe is connected to the sludge system outside the multiphase flow assembled closed coalescing oil removal device; the sludge flushing system and the sludge discharge system are linked by automatic control.

The oil receiving port is a cylindrical structure, the upper end of the cylinder is an elliptical head, the bottom of the elliptical head is filled with packing, and the top of the elliptical head is provided with an oil receiving port.

The invention is developed according to theoretical researches such as collision coalescence, wetting coalescence and shallow pool separation. Based on the kinetic causes of phase contact and particle collision in multiphase flow systems, the submicroscopic mass transfer laws and dynamic causes of multiphase flow systems, the inertial effect theory of phase contact and submicroscopic mass transfer is proposed, and strengthened Coalescing effect, applying horizontal baffled flow coalescing and small-pitch counter-flow inclined plates to the device, passing small oil droplets that are difficult to coalesce in the natural state through multi-stage coalescing materials to make them coalesce to form relatively large The oil droplets increase the floating speed to cause separation. The equipment has the characteristics of fast separation speed, short residence time, high oil removal efficiency, good effluent quality, and small footprint. It adopts pressure-type airtight operation, which is stable, safe and reliable, convenient for oil collection and mud discharge, and realizes the separation of oil, water, and solid three-phase under pressure airtight conditions, which is convenient for automatic control and skid-mounting, and is conducive to ensuring the quality of equipment And shorten the construction period, reduce operating costs.

Description of drawings

Fig. 1-structural schematic diagram of the present invention

Figure 2 - Schematic diagram of mud flushing coil

In the figure A water distribution chamber B coalescence section C separation section D rectification section E water collection chamber

1-Oval head 2-Tank body 3-Manhole 4-Water inlet pipe 5-First stage coalescence section 6-Second stage coalescence section 7-Third stage coalescence section 8-Incline plate separation section 9-Mud flushing pipe 10-mud flushing coil 11-mud collecting bucket 12-oil collection port 13-filling port 14-baffle 15-water collection horn 16-outlet pipe 17-mud flushing nozzle

Detailed ways

In order to further disclose the technical solution of the present invention, the following will be described in detail through the embodiments in conjunction with the accompanying drawings:

The water inlet of the multi-phase flow assembled closed coalescing degreasing device enters the water distribution chamber A through the water inlet pipe 4. After the uniform water distribution is completed in the water distribution chamber A, the sewage enters the first-stage coalescence section 5, and passes through the horizontal wave flow coalescing filler. After the coalescence, part of the dispersed oil and emulsified oil in the water coalesce to form large oil droplets, which pass through the primary coalescence section together with the slick oil and then float up, and gather in the upper part of the tank 2. At the same time, part of the sludge It settles here and deposits in the lower part of the tank body; the water passing through the primary coalescing section 5 then enters the secondary coalescing section 6 and the tertiary coalescing section 7 in turn, and the effect on the sewage in the above two-stage coalescing section is the same as that of a first-stage coalescing section The first-stage coalescence section 5 is the same; the sewage passing through the third-stage coalescence section 7 enters the inclined plate separation section 8, and the packing of the inclined plate separation section 8 is a stainless steel inclined plate, which is arranged in a lateral structure with a high slope and small spacing, and its low surface The load oil-water gravity separation method can ensure the rapid separation of oil, water and mud. The floating oil gathers in the upper part of the tank body 2, and the sinking sludge deposits in the lower part of the tank body; the sewage passing through the inclined plate separation section 8 enters the rectification Section D and rectification section D adopt baffle plate structure to ensure stable flow state, rectification section D and water collection chamber E are separated by baffle plate 14, a small amount of oil floats up and gathers in the upper part of tank body 2; The multi-phase flow fabricated closed coalescing oil removal device is discharged through the water outlet pipe 16, and is connected with the water outlet pipeline outside the multiphase flow assembled closed coalescing oil removal device.

The multiphase flow assembly type airtight coalescing degreasing device adopts the design of automatic opening and closing oil collection structure. After the dirty oil accumulated on the upper part of the tank body 2 is collected by the oil collection port 12 and the filling port 13, it is discharged in time. The degreasing device is connected with the dirty oil collection system outside the multiphase flow assembled closed coalescing degreasing device.

The multi-phase flow assembled closed coalescing degreasing device should regularly remove the sludge accumulated at the bottom of the tank body 2 under normal operating conditions. When discharging sludge, three sets of mud flushing systems and sludge discharge systems are turned on in sequence to complete the discharge of sludge at the bottom of tank 2. When the sludge at the lower part of the secondary coalescence section 6 is to be removed, the mud flushing pipe 9 there is opened, and the mud flushing nozzle 17 of the mud flushing coil flushes the sludge deposited at the lower part of the tank body 2 into the mud collecting bucket 11, While opening the mud flushing pipe 9, open the lower valve of the mud collecting hopper 11 at this place, and now the mud discharge starts. The mud flushing pipe 9 and the mud collecting bucket 11 valve at the junction section 7, after the mud discharge at the tertiary coalescing section 7 is completed, close the mud flushing pipe 9 and the mud collecting bucket 11 valve, and open the inclined plate separation at the same time After the mud flushing pipe 9 at the section 8 and the valve of the mud collecting bucket 11 are completed, close the mud flushing pipe 9 at the inclined plate separation section 8 and the valve of the mud collecting bucket 11. After a period of time, repeat the above actions.

Claims (3)

1. A multiphase flow assembly type airtight coalescence degreasing device, which is suitable for the treatment of conventional oilfield sewage and low-polymer sewage. It is composed of mud flushing system, mud discharge system and oil collection system. It is characterized in that a water inlet pipe is set at the center of the oval head on the left side of the tank body, and the water inlet pipe is connected with the incoming water other than the multiphase flow assembled closed coalescence oil removal device. The pipeline is connected; the outlet pipe is set on the right side of the tank body or the center of the oval head, and the outlet pipe is connected to the external water delivery pipeline other than the multiphase flow assembled closed coalescing degreasing device; in the tank near the side of the water inlet pipe , with a water distribution cavity; behind the water distribution cavity, there are a first-level coalescence section, a second-level coalescence section, a third-level coalescence section, a separation section, a rectification section, and a water collection chamber. The rectification section and the water collection chamber pass through the barrier The baffle plate is separated from the tank, and the baffle is welded on the tank body; a set of mud flushing coils are respectively arranged under the secondary coalescence section, the third stage coalescence section and the separation section at the lower part of the tank body, and the mud flushing coil passes through the mud flushing pipe It is connected with the mud flushing pump outside the multi-phase flow assembled closed coalescing degreasing device; there are four mud collecting hoppers at the bottom of the tank, and the sludge collected by the mud collecting hoppers is connected with the multiphase flow assembled closed coalescing through the sludge discharge pipe. It is connected with the sludge collection system outside the oil removal device; there are three oil collection ports and three packing ports on the top of the tank body, oil and gas can be discharged at the same time, and the dirty oil collected by the oil collection port is connected with the multiphase flow through the oil collection pipe. connected to the dirty oil collection system other than the assembled closed coalescing oil removal device; After the water inlet pipe goes deep into the tank body, it adopts a rotary deflection structure. The outlet of the water inlet pipe faces the side of the oval head, and the outlet water enters the water distribution chamber, which is connected to the first-stage coalescing section; the outlet pipe is connected to the water collection chamber. The end of the outlet pipe on one side of the water chamber is provided with a water collecting horn; Each coalescing section is equipped with a horizontal wave-flow coalescing packing, and the coalescing packing adopts an assembled structure, which is convenient for disassembly and maintenance; The width of the packing in the joint section is the same, and the packing width of the third-stage coalescence section is wider than that of the first-stage and second-stage section; the coalescence section ensures that most of the dispersed oil and emulsified oil in the water are coalesced to form large oil droplets, thereby accelerating the flotation Separation: The stainless steel sloping plate packing in the separation section is arranged with a high-slope and small-pitch lateral flow structure. The spacing of the sloping plates can be adjusted according to the water quality characteristics. The sloping plate packing adopts an assembled structure, which is easy to disassemble and overhaul; It is sealed with the tank body, and there is a mud chamber in the middle. The height of the packing in the separation section is lower than that of the coalescing section, and the width of the packing is wider than that of the coalescing section. The separation section adopts a low surface load oil-water gravity separation method to ensure Three-phase rapid separation. the 2. The multiphase flow assembly type airtight coalescing and degreasing device according to claim 1, characterized in that the connecting structure of the coalescing section, the separating section and the sludge system ensures that the generated sludge is deposited at the bottom of the tank; each Mud flushing nozzles are evenly distributed under the group of mud flushing coils, and automatic mud flushing is realized by adding an external power source; the mud collecting bucket is a cylindrical structure, and the lower end of the cylinder is an elliptical head. There is a sludge discharge port, and the sludge discharge port is connected to the sludge discharge pipe through the flange, and the sludge collected by the sludge collection bucket is connected to the sludge system outside the multi-phase flow assembled closed coalescence degreasing device through the sludge discharge pipe; the sludge flushing system , The sludge discharge system realizes linkage through automatic control. 3. The multi-phase flow assembly type airtight coalescing and degreasing device according to claim 1 or 2, characterized in that the oil receiving port is a cylindrical structure, and the upper end of the cylinder is an oval head, below the oval head Filled with filter packing, there is an oil collection port on the top of the oval head. the