CN212669432U

CN212669432U - Device for treating sulfur-containing wastewater of oil and gas field

Info

Publication number: CN212669432U
Application number: CN202020767515.5U
Authority: CN
Inventors: 陆侨治; 李超
Original assignee: Shaoxing Haikun Water Treatment Technology Co ltd
Current assignee: Shaoxing Haikun Water Treatment Technology Co ltd
Priority date: 2020-05-11
Filing date: 2020-05-11
Publication date: 2021-03-09
Anticipated expiration: 2030-05-11

Abstract

The utility model provides a handle device that oil gas field contains sulphur waste water, includes filter, electric catalytic oxidation room, air supporting room and blow off pipe in proper order according to waste water flow direction, and air supporting room one side is equipped with receives the grease chamber, and electric catalytic oxidation roof portion is equipped with the draught fan, and the indoor crisscross parallel arrangement of electric catalytic oxidation has anode plate and negative plate. The utility model has the advantages of simple operation, have the effects such as air supporting, flocculation, disinfect concurrently, both can regard as the single processing unit, can combine together with other processing technology again. Such as: as the pretreatment of the wastewater, the biodegradability of the wastewater can be improved; suspended matters in water can be removed through the air floatation function.

Description

Device for treating sulfur-containing wastewater of oil and gas field

Technical Field

The utility model relates to a waste water treatment technical field, in particular to handle device that oil gas field contains sulphur waste water.

Background

The sulfur-containing wastewater in the natural gas exploitation process is mainly caused by the decomposition of sulfur-containing compounds in drilling mud, the dissolution of sulfur-containing natural gas in a stratum and the decomposition of sulfur-containing bacteria. The sulfide in the sulfur-containing wastewater is mainly S^2-、HS^-、SO₄ ^2-And a small amount ofOrganic sulfur, wherein H₂S and S^2-The existence of the (B) is the main reason of causing the waste water to have bad smell and high toxicity. Untreated sulfur-containing wastewater not only corrodes oil gas gathering pipelines and equipment, consumes dissolved oxygen and generates thiosulfate or sulfate, but also causes serious pollution to the environment, and brings problems of large treatment difficulty, potential safety hazard and the like. At present, aiming at the type, concentration and waste water amount of sulfur-containing waste water in oil and gas fields, methods such as oxidation, vacuum extraction, steam stripping, precipitation and the like are mainly adopted at home and abroad to reduce sulfide in the waste water to a specified index, and then the sulfur-containing waste water is reinjected into a stratum or is discharged or comprehensively utilized. However, S in the treated wastewater is not limited^2-And the CODcr concentration remained off-specification. Therefore, an effective method for treating sulfur-containing wastewater in oil and gas fields is urgently sought.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve prior art's problem, provide a handle device that oil gas field contains sulphur waste water, equipment operation is simple, has air supporting, flocculation, effect such as disinfect concurrently, both can regard as the independent processing unit, can combine together with other processing technology again, is particularly suitable for the processing application that contains sulphur waste water in oil gas field.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a handle device that oil gas field contains sulphur waste water, includes filter, electric catalytic oxidation room, air supporting room and blow off pipe in proper order according to waste water flow direction, and air supporting room one side is equipped with receives the grease chamber, and electric catalytic oxidation roof portion is equipped with the draught fan, and the indoor crisscross parallel arrangement of electric catalytic oxidation has anode plate and negative plate. Sulfur-containing wastewater firstly passes through a filter, and is primarily adsorbed, filtered and intercepted by sand, oil stains and the like, and then is treated by sulfide wastewater through an electrocatalytic oxidation chamber, wherein the spacing distance between an anode plate and a cathode plate in the electrocatalytic oxidation chamber can be flexibly adjusted, the cathode and the anode are parallelly inserted into a reactor, and the two electrodes are opposite. The waste water is subjected to advanced oxidation of the electrocatalytic oxidation chamber, the generated gas is discharged outside through the induced draft fan, the waste water has a flotation function, enters the steam flotation chamber, a small amount of oil in the waste water overflows into the oil receiving chamber, and the rest is discharged outside through the blow-off pipe.

Preferably, the anode plate and the cathode plate adopt titanium substrates.

Preferably, the surfaces of the anode plate and the cathode plate are fixed with a noble metal layer.

Preferably, the noble metal layer is one or more of oxides of platinum, ruthenium, iridium, rubidium and zirconium.

Preferably, the filter is an activated carbon filter, and the inside of the filter is filled with granular activated carbon with different particle sizes of 1-5 cm.

Preferably, the granular activated carbon comprises 50%, 30% and 20% of small granular coconut shell activated carbon, columnar shell activated carbon and irregular large granular lignite activated carbon respectively.

Preferably, the columnar shell activated carbon is one or more of apricot shell activated carbon, jujube shell activated carbon, walnut shell activated carbon, olive shell activated carbon and peach shell activated carbon.

Preferably, the power supply adopted by the device is a stabilized direct current power supply, the output voltage is 0-30V, and the output current is 0-300A. The output voltage is adjustable, and the method is particularly suitable for treating sulfur-containing wastewater in oil and gas fields.

The Electrochemical oxidation (electro-oxidation) method adopted by the utility model is called as the environment-friendly technology, has unique advantages compared with other oxidation technologies, and has the beneficial effects that:

(1) by changing the impressed current and voltage, the reaction conditions can be adjusted at any time, the electron transfer is only carried out between the electrode and the waste water components, and no redox agent is required to be added, so that the problem of secondary pollution caused by adding a medicament additionally is avoided.

(2) The free radicals generated by the electrochemical oxidation can directly react with pollutants in the wastewater without selection, the energy efficiency is high, the reaction condition is mild, the electrochemical process can be generally carried out at normal temperature and normal pressure, the electrochemical process can be degraded, and no secondary pollution is caused.

(3) The reactor has simple operation, has the functions of air floatation, flocculation, sterilization and the like, can be used as an independent processing unit, and can be combined with other processing technologies. If the product is used for the pretreatment of wastewater, the biodegradability of the wastewater can be improved; for example, suspended matters in water can be removed through the air floatation function.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The main elements in the figures are symbolically illustrated: 1. a filter; 2. an electrocatalytic oxidation chamber; 3. an air flotation chamber; 4. a blow-off pipe; 5. an oil receiving chamber; 6. an induced draft fan; 7. an anode plate; 8. and a cathode plate.

Detailed Description

The invention will be further explained by means of the following description and the attached drawings.

The implementation mode is as follows: as shown in figure 1, the device for treating sulfur-containing wastewater in the oil and gas field sequentially comprises a filter 1, an electrocatalytic oxidation chamber 2, an air flotation chamber 3 and a drain pipe 4 according to the flow direction of the wastewater, wherein an oil receiving chamber 5 is arranged on one side of the air flotation chamber 3, an induced draft fan 6 is arranged at the top of the electrocatalytic oxidation chamber 2, and an anode plate 7 and a cathode plate 8 are arranged in the electrocatalytic oxidation chamber 2 in a staggered and parallel manner. The anode plate 7 and the cathode plate 8 are titanium substrates with precious metal layers on the surfaces, and the precious metal layers are made of one or more of oxides of platinum, ruthenium, iridium, rubidium and zirconium.

In addition, the filter 1 is an activated carbon filter, the inside of the filter is filled with granular activated carbon with different sizes of 1-5 cm, and the granular activated carbon comprises small granular coconut shell activated carbon, columnar shell activated carbon and irregular large granular lignite activated carbon, and the proportion of the granular activated carbon is 50%, 30% and 20% respectively. Wherein the columnar shell activated carbon is one or more of apricot shell activated carbon, jujube shell activated carbon, walnut shell activated carbon, olive shell activated carbon and peach shell activated carbon.

The utility model discloses the power that the device adopted is steady voltage DC power supply, and output voltage is 0~30V adjustable, and output current is 0~ 300A. The electrochemical catalytic oxidation sulfur removal is approximately the same as the electrochemical sterilization from the action mechanism: the electrochemical sterilization is the electrolysis of Cl in water^-Generating HClO for sterilization; electrochemical sulfur removal, one is S^2-Directly discharging on the electrode to generate high-valence sulfur, and electrolyzing chlorine-containing sewageThe electrolytically generated HClO may also cause S to be^2-Oxidized to higher sulfur. When Cl is simultaneously existed in the sewage^-And S^2-Although in general S^2-Concentration ratio of (C) Cl^-Much lower ion, but S^2-Standard reduction electrode potential (-0.48V) to Cl^-The standard reduction potential of (1.36V) is much more negative and still preferentially discharges at the electrode.

The amount and size of the hydrogen and oxygen bubbles produced at the electrode depends on the current density at the electrode, and 0.0224 Nm/1F (26.8A ٠ h) will be produced according to Faraday's law of electrolysis³Hydrogen and oxygen. When the hydrogen bubbles and the oxygen bubbles rise, a velocity gradient is formed from bottom to top to generate a stirring effect, so that the opportunity of collision polymerization of dipole oil particles is greatly increased, and the oil particles reach 0.1-1 mm. These oil particles are in a sponge form due to being filled with a large amount of gas during the rising process, and have a density much lower than that of water, so that they can quickly float upward in a very short time to be separated from water. Air flotation separation function: the electrochemical method is adopted to generate hydrogen, oxygen, chlorine and the like in situ, and the traditional air floatation process is completely replaced. Electrochemical gas flotation is a unit operation for electrochemically removing harmful impurities such as crude oil and solid particles from a liquid phase. The principle of upward floating is that when oil-containing sewage passes through an electrolytic cell, 3 reactions are generated:

and (3) cathode reaction: 2H^＋ + 2e → H₂↑

And (3) anode reaction: 4OH^- - 4e → 2H₂O + O₂↑

2C1^- - 2e → Cl₂↑

The hydrogen, oxygen and chlorine gases generated by electrolyzing water carry colloidal particles in the sewage to float upwards together, thereby achieving the purposes of separation and purification. The electro-flotation method is superior to the diffusion gas flotation method and the pressurized dissolved air flotation method because the diameter of bubble particles generated by the electro-flotation method is smaller, the smaller the limiting diameter of adsorbable particles is, the better the water quality of the treated water is, for example, the hydrogen bubbles are 10-30 μm, the oxygen bubbles are 20-60 μm, and the specific surface is relatively larger, so that the relative contact area with impurities in the sewage is larger, and the adsorption capacity of the bubble particles is also stronger. The method is characterized in that: has the functions of electrocatalytic oxidation, electro-flotation, electrocoagulation, demulsification and sterilization; the equipment is compact, the operation parameters are easy to adjust, and the automation degree is high.

The above description is only the specific embodiments of the present invention, but the structural features of the present invention are not limited thereto, the present invention can be used in similar products, and any person skilled in the art is in the field of the present invention, and all the changes or modifications made are covered by the claims of the present invention.

Claims

1. The utility model provides a handle oil gas field contains device of sulphur waste water which characterized in that: the waste water treatment device sequentially comprises a filter (1), an electrocatalytic oxidation chamber (2), an air flotation chamber (3) and a sewage discharge pipe (4) according to the flow direction of waste water, wherein an oil receiving chamber (5) is arranged on one side of the air flotation chamber (3), an induced draft fan (6) is arranged at the top of the electrocatalytic oxidation chamber (2), and anode plates (7) and cathode plates (8) are arranged in the electrocatalytic oxidation chamber (2) in a staggered and parallel mode.

2. The device for treating sulfur-containing wastewater in oil and gas fields as claimed in claim 1, wherein: the anode plate (7) and the cathode plate (8) adopt titanium substrates.

3. The device for treating sulfur-containing wastewater in oil and gas fields as claimed in claim 2, wherein: and the surfaces of the anode plate (7) and the cathode plate (8) are fixedly provided with a noble metal layer.

4. The device for treating sulfur-containing wastewater in oil and gas fields as claimed in claim 3, wherein: the noble metal layer is made of one of oxides of platinum, ruthenium, iridium, rubidium and zirconium.

5. The device for treating sulfur-containing wastewater in oil and gas fields as claimed in claim 1, wherein: the filter (1) is an activated carbon filter, and the inside of the filter is filled with granular activated carbon with different particle sizes of 1-5 cm.

6. The device for treating sulfur-containing wastewater in oil and gas fields as claimed in claim 5, wherein: the granular activated carbon comprises small granular coconut shell activated carbon, columnar shell activated carbon and large granular lignite activated carbon, and the proportion of the granular activated carbon is 50%, 30% and 20% respectively.

7. The device for treating sulfur-containing wastewater in oil and gas fields as claimed in claim 6, wherein: the columnar shell activated carbon is one or more of apricot shell activated carbon, jujube shell activated carbon, walnut shell activated carbon, olive shell activated carbon and peach shell activated carbon.

8. The apparatus for treating sulfur-containing wastewater in oil and gas fields according to any one of claims 1 to 7, wherein: the power supply adopted by the device is a voltage-stabilized direct-current power supply, the output voltage is 0-30V, and the output current is 0-300A.