Micro-electrolysis oxidation device

Abstract

The utility model relates to the technical field of sewage treatment, in particular to a micro-electrolysis oxidation device which comprises a box body, a micro-electrolysis reaction bin and an oxidation reaction bin are arranged in the box body, a filler support is arranged in the micro-electrolysis reaction bin, a filler separation bin is arranged above the filler support, and an overflow weir is arranged on the upper portion of the filler separation bin. The overflow weir is connected with a self-flowing pipe which is communicated with the oxidation reaction bin; and the filler separation bin consists of a plurality of small bins. According to the device, the removal rate of polymer-containing produced water is far higher than that of a traditional device, meanwhile, the oil content, the suspended solid concentration, the particle size of oil particles, the turbidity and the viscosity are reduced, the problems of passivation and blockage of electrolytic materials are solved, the common problems of hardening, channeling and attenuation of a micro-electrolysis process are thoroughly solved, filler is saved, the reaction time is shortened, and the reaction effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a micro-electrolytic oxidation device. Background Art

[0002] The production process of oil and gas fields generates a large amount of produced water. Produced water is extracted from the formation along with crude oil and undergoes primary processing, such as demulsification and separation, to form a multiphase system containing suspended solids, oil, dissolved gases, and dissolved salts. Impurities in produced water primarily include suspended solids, colloidal particles, dispersed and floating oil, emulsified oil, and dissolved substances. Discharge of this wastewater without advanced treatment will have a significant impact on the surrounding environment. After treatment, produced water can be reused in water injection production, a practice known as "produced water reinjection." Produced water reinjection effectively reduces the demand for fresh water in oil and gas field production and is crucial for conserving water resources.

[0003] Polymer flooding is a key technology for enhancing oil recovery during tertiary oil recovery (TER) in oilfields. However, while polymer flooding enhances oil recovery, it also generates significant amounts of produced water. Compared to conventional produced water, polymer flooding produced water contains higher levels of oil and suspended solids and is more difficult to treat. Direct reinjection can cause formation blockage, damage cores, increase injection pressure, and reduce recovery. Compared to water flooding produced water, polymer flooding produced water, in addition to containing conventional produced water components such as petroleum hydrocarbons, solid particles, inorganic salts, and bacteria, also exhibits the following characteristics: 1. It contains significant amounts of residual HPAM, with concentrations reaching approximately 500 mg / L at high levels. 2. It has high viscosity. 3. The initial particle size of oil droplets in the wastewater is small. 4. It exhibits enhanced emulsification. 5. The produced water quality is generally poor. Therefore, polymer flooding produced water presents greater challenges in treatment.

[0004] During the reinjection process, produced water quality must meet the requirements of SY / T5329-2012, "Water Quality Indicators and Analysis Methods for Clastic Reservoirs." Therefore, it is necessary to remove suspended solids, floating oil, and emulsified oil from the produced water. Currently, there is a lack of efficient and low-cost treatment technologies for polymer-containing produced water from oil and gas fields.

[0005] Micro-electrolysis reactors are devices for treating high-concentration wastewater. The filler inside the reactor can significantly improve the biodegradability of wastewater, removing color and heavy metals. They are currently a widely used new type of sewage treatment equipment. However, traditional micro-electrolysis reactors generally adopt a cylindrical structure, with water entering from the bottom. This often leads to uneven water distribution, causing filler passivation, compaction, blockage, and channeling. Furthermore, because the iron and carbon are in physical contact, an isolation layer easily forms between them, leading to filler passivation and the need for frequent replacement of micro-electrolysis materials, resulting in wasteful resources. Utility Model Content

[0006] The purpose of this utility model is to provide a micro-electrolytic oxidation device that, in order to address the above technical problems, achieves a far higher removal rate for polymer-containing produced water than conventional devices, while simultaneously reducing oil content, suspended solids concentration, oil particle size, turbidity, and viscosity, and addressing issues of electrolytic material passivation and clogging. This device thoroughly resolves the common problems of compaction, channeling, and attenuation in micro-electrolysis processes, conserves filler, shortens reaction time, and improves reaction efficiency.

[0007] The micro-electrolysis oxidation device described in the utility model includes a box body, in which a micro-electrolysis reaction chamber and an oxidation reaction chamber are arranged. A filler support is arranged in the micro-electrolysis reaction chamber, a filler separation chamber is arranged above the filler support, an overflow weir is arranged on the upper part of the filler separation chamber, the overflow weir is connected to a gravity pipe, and the gravity pipe is connected to the oxidation reaction chamber; the filler separation chamber is composed of multiple small chambers.

[0008] A water inlet distribution pipe is arranged at the lower part of the micro-electrolysis reaction chamber, a first aeration pipe is arranged above the water inlet distribution pipe, a filler support is arranged above the first aeration pipe, and a filler separation chamber is arranged above the filler support.

[0009] The first aeration pipe is provided with a first aeration device.

[0010] A second aeration pipe is provided at the bottom of the oxidation reaction chamber, and a second aeration device is provided on the second aeration pipe.

[0011] A cyclone coagulation reaction chamber is arranged on one side of the oxidation reaction chamber away from the micro-electrolysis reaction chamber.

[0012] A cyclone tube is provided in the cyclone coagulation reaction chamber, and a first cyclone pipe opening is provided on the cyclone tube.

[0013] A second cyclone pipe opening is provided on the cyclone pipe in the cyclone coagulation reaction chamber.

[0014] A hole is provided at the bottom of the small chamber.

[0015] A partition is provided between the micro-electrolysis reaction chamber and the oxidation reaction chamber.

[0016] A bottom plate is arranged at the bottom of the box body, and a bottom skid is arranged below the bottom plate.

[0017] The bottom plate is located below the micro-electrolysis reaction chamber and the oxidation reaction chamber.

[0018] The filler separation bin is composed of a small chamber for storing fillers. A hole is arranged at the bottom of the small chamber so that sewage flows upward from the bottom and the fillers will not fall into the chamber below.

[0019] The micro-electrolysis reaction chamber is composed of a bottom skid, a bottom plate, a filler support, a filler separation chamber, an overflow weir, a water inlet distribution pipe, a first aeration pipe, and a first aeration device.

[0020] The oxidation reaction chamber is the Fe produced by micro-electrolysis reaction2+ Under alkaline conditions, the ions react with the blown air to produce a chamber of Fe(OH)3 with a flocculation effect.

[0021] The oxidation reaction chamber is composed of a bottom skid, a bottom plate, a gravity pipe, a second aeration pipe, a second aeration device, and a cyclone coagulation reaction chamber.

[0022] The bottom skid is welded from profiles and placed at the bottom of the micro-electrolysis reaction chamber and the oxidation reaction chamber. It can reinforce the bottom plate to form a skid-mounted device and prevent the device from deformation.

[0023] The filler support is welded by profiles and supports the filler to separate the bins.

[0024] The micro-electrolysis reaction chamber is divided into an upper chamber and a lower chamber. The lower chamber is evenly distributed with water inlet distribution pipes, the first aeration pipe, and the first aeration device. The upper chamber is composed of a filler support, a filler separation chamber, and an overflow weir.

[0025] The overflow weir mainly functions to collect the aqueous phase medium that has undergone electrolysis reaction and enters the oxidation reaction chamber through the gravity pipe.

[0026] The cyclone coagulation reaction chamber is mainly used to form small virtual bodies of suspended matter in sewage under the flocculation effect of Fe(OH), which is convenient for subsequent sedimentation treatment.

[0027] The produced water enters the cyclone coagulation reaction chamber from the cyclone tube in a tangential water inlet manner.

[0028] The micro-electrolysis reaction chamber aeration system comprises a first aeration pipe and a first aeration device.

[0029] The oxidation reaction chamber air distribution system comprises a second aeration device and a second aeration pipe.

[0030] A water outlet is arranged at the bottom of the cyclone coagulation reaction chamber.

[0031] The operating principle of the utility model is as follows:

[0032] After undergoing coalescence degreasing to remove most of the oil, produced water enters the bottom of the micro-electrolysis oxidation reactor through the inlet distribution pipe. It first undergoes an electrochemical reaction in the micro-electrolysis zone, where it comes into full contact with the iron-carbon filler in the micro-electrolysis reactor. The micro-electrolysis reactor's aeration system also provides aeration and agitation to prevent clogging of the filler with electrolysis products. After the reaction, the produced water flows by gravity into the oxidation reactor, which is equipped with a water distribution system and a cyclonic aeration system for adequate aeration. The ferric and ferrous ions generated by electrolytic oxidation oxidize and polymerize under alkaline conditions to form ferric hydroxide colloids. Fe(OH)3 has efficient flocculation and adsorption properties, improving the settling performance of the produced water. The wastewater from electrolytic oxidation is then pumped into the back-end coagulation unit via a secondary lift pump.

[0033] Produced water flows upward from the tubular water distributor at the bottom of the tank, layer by layer, through the electrolytic material layers in the packing separation chamber. Simultaneously, it undergoes aeration through the first aeration tube. The electrolytic treatment of the produced water is completed with the stratified aeration and agitation. The electrolytically treated wastewater then flows through the gravity pipe into the oxidation reaction chamber for reaction.

[0034] The first aeration pipe delivers air source, which is evenly distributed through the first aeration device to provide air source for the micro-electrolysis reaction chamber. The stirring of the air source prevents the contaminants from clogging the filler. The second aeration device provides oxygen to the oxidation reaction chamber to participate in the oxidation reaction, so that the Fe produced by the electrolysis reaction in the micro-electrolysis reaction chamber is 2+ The ions are oxidized to Fe(OH)3 which has a flocculating effect.

[0035] The electrolytic material area is a multi-layered honeycomb partition, which makes the filler loose and uniform, solves the defects of filler compaction and channel formation, increases the water-passing specific surface area of the filler, and improves the reaction effect; and all the iron mud is brought out through stratified aeration and stirring.

[0036] Compared with the prior art, the beneficial effects of the present invention are:

[0037] 1) Save filler, shorten reaction time and improve reaction effect.

[0038] 2) The micro-electrolysis reaction device has a much higher removal rate for polymer-containing produced water than traditional devices, and can simultaneously reduce oil content, suspended solids concentration, oil particle size, turbidity and viscosity.

[0039] 3) Solved the problems of passivation and blockage of electrolytic materials.

[0040] 4) The utility model adopts a compartmentalized micro-electrolysis device with a layered design of micro-electrolysis reaction chambers, which consists of tens of thousands of chambers, and completely solves the common problems of compaction, channeling and attenuation of micro-electrolysis fillers.

[0041] 5) The water-permeable surface area of the filler is increased, and all the iron sludge is brought out through stratified aeration and stirring. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 Schematic diagram of the structure of this utility model;

[0043] Figure 2 Schematic diagram of the bottom structure of the small chamber;

[0044] In the figure, 1. micro-electrolysis reaction chamber; 2. oxidation reaction chamber; 3. bottom skid; 4. filler support; 5. small chamber; 6. overflow weir; 7. gravity pipe; 8. water inlet distribution pipe; 9. first aeration pipe; 10. first aeration device; 11. second aeration device; 12. cyclone coagulation reaction chamber; 13. box body; 14. second aeration pipe; 15. partition; 16. bottom plate; 17. first cyclone pipe outlet; 18. hole; 19. second cyclone pipe outlet; 20. water outlet. DETAILED DESCRIPTION

[0045] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments. Example 1

[0046] The micro-electrolysis oxidation device described in this embodiment includes a box body 13, in which a micro-electrolysis reaction chamber 1 and an oxidation reaction chamber 2 are provided. A filler support 4 is provided in the micro-electrolysis reaction chamber 1, and a filler separation chamber is provided above the filler support 4. An overflow weir 6 is provided on the upper part of the filler separation chamber, and the overflow weir 6 is connected to a gravity pipe 7, which is connected to the oxidation reaction chamber 2; the filler separation chamber is composed of multiple small chambers 5.

[0047] A water inlet distribution pipe 8 is provided at the lower part of the micro-electrolysis reaction chamber 1 , a first aeration pipe 9 is provided above the water inlet distribution pipe 8 , a filler support 4 is provided above the first aeration pipe 9 , and a filler separation chamber is provided above the filler support 4 .

[0048] The first aeration pipe 9 is provided with a first aeration device 10 .

[0049] A second aeration pipe 14 is provided at the bottom of the oxidation reaction chamber 2 , and a second aeration device 11 is provided on the second aeration pipe 14 .

[0050] A cyclone coagulation reaction chamber 12 is provided on a side of the oxidation reaction chamber 2 away from the micro-electrolysis reaction chamber 1 .

[0051] A cyclone tube is provided in the cyclone coagulation reaction chamber 12 , and a first cyclone pipe opening 17 is provided on the cyclone tube.

[0052] A second cyclone pipe opening 19 is provided on the cyclone pipe in the cyclone coagulation reaction chamber 12 .

[0053] A hole 18 is provided at the bottom of the small chamber 5 .

[0054] A partition 15 is provided between the micro-electrolysis reaction chamber 1 and the oxidation reaction chamber 2 .

[0055] A bottom plate 16 is provided at the bottom of the box body 13 , and a bottom skid 3 is provided below the bottom plate 16 .

[0056] The bottom plate 16 is located below the micro-electrolysis reaction chamber 1 and the oxidation reaction chamber 2 .

[0057] The filler separation bin is composed of a small chamber 5 for storing the filler. A hole 18 is provided at the bottom of the small chamber 5 so that sewage flows upward from the bottom and the filler does not fall into the chamber below.

[0058] The micro-electrolysis reaction chamber 1 is composed of a bottom skid 3, a bottom plate 16, a filler support 4, a filler separation chamber 5, an overflow weir 6, a water inlet distribution pipe 8, a first aeration pipe 9, and a first aeration device 10.

[0059] The oxidation reaction chamber 2 is composed of a bottom skid 3, a bottom plate 16, a gravity pipe 7, a second aeration pipe 14, a second aeration device 11, and a cyclone coagulation reaction chamber 12.

[0060] The bottom skid 3 is welded from profiles and is placed at the bottom of the micro-electrolysis reaction chamber 1 and the oxidation reaction chamber 2 .

[0061] The filler support 4 is welded by profiles and supports the filler separation compartment.

[0062] The micro-electrolysis reaction chamber 1 is divided into an upper chamber and a lower chamber. The lower chamber is evenly distributed with a water inlet distribution pipe 8, a first aeration pipe 9, and a first aeration device 10. The upper chamber is composed of a filler support 4, a filler separation chamber, and an overflow weir 6.

[0063] The overflow weir 6 is mainly used to collect the aqueous phase medium that has undergone electrolysis reaction and enter the oxidation reaction chamber 2 through the gravity pipe 7.

[0064] The produced water enters the cyclone coagulation reaction chamber 12 from the cyclone tube in a tangential water inlet manner.

[0065] The gas distribution system of the micro-electrolysis reaction chamber 1 includes a first aeration pipe 9 and a first aeration device 10 .

[0066] The air distribution system of the oxidation reaction chamber 2 is a second aeration device and a second aeration pipe.

[0067] A water outlet 20 is provided at the bottom of the cyclone coagulation reaction chamber 12 .

Claims

1. A micro-electrolytic oxidation device, characterized in that: The invention comprises a box body (13), wherein a micro-electrolysis reaction chamber (1) and an oxidation reaction chamber (2) are provided in the box body (13), a filler support (4) is provided in the micro-electrolysis reaction chamber (1), a filler separation chamber is provided above the filler support (4), an overflow weir (6) is provided on the upper part of the filler separation chamber, the overflow weir (6) is connected to a gravity pipe (7), and the gravity pipe (7) is communicated with the oxidation reaction chamber (2); the filler separation chamber is composed of a plurality of small chambers (5).

2. The micro-electrolytic oxidation device according to claim 1, characterized in that A water inlet distribution pipe (8) is provided at the lower part of the micro-electrolysis reaction chamber (1), a first aeration pipe (9) is provided above the water inlet distribution pipe (8), a filler support (4) is provided above the first aeration pipe (9), and a filler separation chamber is provided above the filler support (4).

3. The micro-electrolytic oxidation device according to claim 2, characterized in that: A first aeration device (10) is provided on the first aeration pipe (9).

4. The micro-electrolytic oxidation device according to claim 1, characterized in that A second aeration pipe (14) is provided at the bottom of the oxidation reaction chamber (2), and a second aeration device (11) is provided on the second aeration pipe (14).

5. The micro-electrolytic oxidation device according to claim 1, characterized in that: A cyclone coagulation reaction chamber (12) is provided on a side of the oxidation reaction chamber (2) away from the micro-electrolysis reaction chamber (1).

6. The micro-electrolytic oxidation device according to claim 5, characterized in that: A cyclone tube is provided in the cyclone coagulation reaction chamber (12), and a first cyclone tube opening (17) is provided on the cyclone tube.

7. The micro-electrolytic oxidation device according to claim 1, characterized in that: A hole (18) is provided at the bottom of the small chamber (5).

8. The micro-electrolytic oxidation device according to claim 1, characterized in that: A partition (15) is provided between the micro-electrolysis reaction chamber (1) and the oxidation reaction chamber (2).

9. The micro-electrolytic oxidation device according to claim 1, characterized in that: A bottom plate (16) is provided at the bottom of the box body (13), and a bottom skid (3) is provided below the bottom plate (16).

10. The micro-electrolytic oxidation device according to claim 9, characterized in that: The bottom plate (16) is located below the micro-electrolysis reaction chamber (1) and the oxidation reaction chamber (2).

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