CN111847810A - Oil field tank bottom sludge treatment equipment - Google Patents
Oil field tank bottom sludge treatment equipment Download PDFInfo
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- CN111847810A CN111847810A CN201910336799.4A CN201910336799A CN111847810A CN 111847810 A CN111847810 A CN 111847810A CN 201910336799 A CN201910336799 A CN 201910336799A CN 111847810 A CN111847810 A CN 111847810A
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- tank
- oil
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- sludge
- oxidation
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- 239000010802 sludge Substances 0.000 title claims abstract description 158
- 239000003921 oil Substances 0.000 claims abstract description 191
- 238000004140 cleaning Methods 0.000 claims abstract description 83
- 239000010779 crude oil Substances 0.000 claims abstract description 53
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 51
- 238000000926 separation method Methods 0.000 claims abstract description 19
- 230000001105 regulatory effect Effects 0.000 claims description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000002002 slurry Substances 0.000 claims description 35
- 238000005192 partition Methods 0.000 claims description 32
- 238000003756 stirring Methods 0.000 claims description 30
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- 238000012544 monitoring process Methods 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 16
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- 238000000034 method Methods 0.000 claims description 9
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- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 5
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- 229910052911 sodium silicate Inorganic materials 0.000 description 5
- 239000002270 dispersing agent Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- LCPVQAHEFVXVKT-UHFFFAOYSA-N 2-(2,4-difluorophenoxy)pyridin-3-amine Chemical compound NC1=CC=CN=C1OC1=CC=C(F)C=C1F LCPVQAHEFVXVKT-UHFFFAOYSA-N 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- VTIIJXUACCWYHX-UHFFFAOYSA-L disodium;carboxylatooxy carbonate Chemical compound [Na+].[Na+].[O-]C(=O)OOC([O-])=O VTIIJXUACCWYHX-UHFFFAOYSA-L 0.000 description 3
- 239000003814 drug Substances 0.000 description 3
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- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 description 3
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- CHQMHPLRPQMAMX-UHFFFAOYSA-L sodium persulfate Substances [Na+].[Na+].[O-]S(=O)(=O)OOS([O-])(=O)=O CHQMHPLRPQMAMX-UHFFFAOYSA-L 0.000 description 3
- MWNQXXOSWHCCOZ-UHFFFAOYSA-L sodium;oxido carbonate Chemical group [Na+].[O-]OC([O-])=O MWNQXXOSWHCCOZ-UHFFFAOYSA-L 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- 239000005708 Sodium hypochlorite Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 description 2
- BHDAXLOEFWJKTL-UHFFFAOYSA-L dipotassium;carboxylatooxy carbonate Chemical compound [K+].[K+].[O-]C(=O)OOC([O-])=O BHDAXLOEFWJKTL-UHFFFAOYSA-L 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
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- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 description 2
- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 description 1
- WBIQQQGBSDOWNP-UHFFFAOYSA-N 2-dodecylbenzenesulfonic acid Chemical compound CCCCCCCCCCCCC1=CC=CC=C1S(O)(=O)=O WBIQQQGBSDOWNP-UHFFFAOYSA-N 0.000 description 1
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000004155 Chlorine dioxide Substances 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229920001214 Polysorbate 60 Polymers 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 235000019398 chlorine dioxide Nutrition 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
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- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 229940060296 dodecylbenzenesulfonic acid Drugs 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000001804 emulsifying effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000002920 hazardous waste Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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- 229920000136 polysorbate Polymers 0.000 description 1
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- 238000010992 reflux Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- FQENQNTWSFEDLI-UHFFFAOYSA-J sodium diphosphate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]P([O-])(=O)OP([O-])([O-])=O FQENQNTWSFEDLI-UHFFFAOYSA-J 0.000 description 1
- BAZAXWOYCMUHIX-UHFFFAOYSA-M sodium perchlorate Chemical compound [Na+].[O-]Cl(=O)(=O)=O BAZAXWOYCMUHIX-UHFFFAOYSA-M 0.000 description 1
- 229910001488 sodium perchlorate Inorganic materials 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229940048086 sodium pyrophosphate Drugs 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 235000019818 tetrasodium diphosphate Nutrition 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/06—Treatment of sludge; Devices therefor by oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/127—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering by centrifugation
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G1/00—Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
-
- 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
- C02F2303/06—Sludge reduction, e.g. by lysis
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G2300/00—Aspects relating to hydrocarbon processing covered by groups C10G1/00 - C10G99/00
- C10G2300/10—Feedstock materials
- C10G2300/1003—Waste materials
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Wood Science & Technology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses oil field tank bottom oil sludge treatment equipment which is sequentially connected with a potential adjusting device, a settling tank, a cleaning device and a centrifuge through pipelines, wherein the potential adjusting device is used for adjusting and improving the oxidation-reduction potential of tank bottom oil sludge introduced into the adjusting device. The treatment equipment provided by the invention is used for adjusting the oxidation-reduction potential of the oil sludge at the tank bottom, so that the oil sludge is converted from a reduction state to an oxidation state, the oxidation-reduction potential of the oil sludge is improved, the adsorption quantity and adsorption strength of the crude oil by the soil in the oil sludge are reduced, the separation efficiency of the crude oil and sand grains in the oil sludge at the tank bottom is improved, and the recovery of the crude oil in the oil sludge at the tank bottom of an oil field and the standard treatment of the soil are realized by changing the adsorption force of oil and soil particles.
Description
Technical Field
The invention relates to treatment equipment for oil field sludge, in particular to treatment equipment for oil field tank bottom oil sludge, belongs to the technical field of environmental protection, and mainly aims at standard treatment of oil field tank bottom oil sludge (after treatment, the crude oil content in soil is less than 2%).
Background
Tank bottom oil sludge is a waste produced in the production process of oil fields, mainly comprises water, crude oil, silt and the like, and is listed in the national hazardous waste list due to huge environmental pollution risks. The main technologies for treating tank bottom oil sludge at present are as follows: 1) performing high-temperature pyrolysis, namely degrading organic matters in the oil sludge into low-molecular-weight hydrocarbon condensate and non-condensed gas under the inert environment condition of 500-1000 ℃, and pyrolyzing substances such as solid residue coke and the like; 2) incineration, in an incinerator (rotary kiln: 980 ℃ and 1200 ℃, fluidized bed: introducing excess air and auxiliary fuel into the oil sludge at 730 ℃ and 760 ℃) to completely combust and remove the organic matters in the oil sludge; 3) washing with a surfactant, namely emulsifying oil in the oil sludge into a washing liquid by using a high-concentration surfactant solution; 4) an extraction method, wherein an organic solvent is added into oil sludge according to the volume ratio to transfer crude oil from soil into the solvent, and then the solvent is separated from the soil; however, the methods have the defects that the high-temperature pyrolysis and incineration have high energy consumption and high treatment cost, valuable crude oil cannot be recovered, and especially tank bottom oil sludge with high water content is not suitable for the method; in the surfactant cleaning technology, a large amount of surfactant is required to be added, and the biodegradability of the surfactant is weak, so that the problems of treatment of a large amount of oily sewage and the like are caused; the extraction method needs to add a large amount of organic solvent, has high cost and low solvent recovery rate, and can bring the risk of environmental pollution of an operation area; therefore, the development of a treatment technology which has low treatment cost and good effect and can recycle the crude oil as resources is always a focus of close attention in oil field production.
Disclosure of Invention
The oil sludge treatment equipment adjusts the oxidation-reduction potential of the oil sludge at the tank bottom, so that the oil sludge is converted into an oxidation state or neutral from the reduction state, the oxidation-reduction potential of the oil sludge is improved, the adsorption quantity and adsorption strength of the soil in the oil sludge on the crude oil are reduced, the separation efficiency of the crude oil and sand grains in the oil sludge at the tank bottom is improved, the recovery efficiency of the crude oil in the oil sludge waste at the tank bottom is high, the crude oil is completely recovered, the treatment cost of the oil sludge at the tank bottom of the waste is reduced, and the cost of recovering the crude oil from the waste is reduced.
In order to achieve the purpose of the invention, the invention provides oil field tank bottom oil sludge treatment equipment which comprises a potential adjusting device, a settling tank, a cleaning device and a centrifuge which are sequentially connected through pipelines, wherein the potential adjusting device is used for adjusting and increasing the oxidation-reduction potential of tank bottom oil sludge introduced into the potential adjusting device.
Wherein the potential adjusting device adjusts the oxidation-reduction potential of the oil sludge at the bottom of the tank to 10-100mV, preferably 15-50 mV.
In particular, the potential adjusting device comprises a potential adjusting tank, a first mechanical stirrer, a partition plate, an ORP monitor (i.e. an oxidation-reduction potential monitor), and a first fixed beam, wherein: the partition plate and the ORP monitor are arranged in the potential regulating pool; the first fixed cross beam is arranged at the top of the potential regulating pool; and the first mechanical stirrer is fixedly connected with the first fixed cross beam and is used for stirring and treating tank bottom oil sludge, potential regulating oxidant and water introduced into the potential regulating tank.
The first stirrer is used for stirring and uniformly mixing the oil sludge, the water and the oxidant to ensure that the oxidant and the oil sludge react fully; the baffle is used for ensuring and avoiding disturbance of an oxidizing agent and tank bottom oil sludge entering the regulating reservoir to the ORP monitor; the ORP monitor is used for monitoring the oxidation-reduction potential of the oil sludge after the oil sludge and the oxidant fully react.
Wherein the depth of the cuboid regulating pool is not less than 1.5 m, and the ratio of the length to the width is 1.5-2: 1, preferably 1.5: 1.
Particularly, the partition plate is parallel to the side wall of the adjusting tank in the width direction, two sides of the partition plate are respectively fixed with the two side walls of the adjusting tank in the length direction, and the height of the partition plate is smaller than the depth of the adjusting tank.
In particular, the upper end of the baffle plate is level with the upper end of the regulating tank, and the lower end of the baffle plate is 300 mm and 800mm, preferably 500mm away from the bottom of the regulating tank.
In particular, an inlet is provided in the upper part of the side wall of the potential adjustment tank, and the inlet is connected to an inlet pipe, and tank bottom sludge, a potential adjustment oxidizing agent, and water (diluted sludge to reduce the viscosity of the sludge) are added to the adjustment tank.
The potential regulating oxidant is selected from percarbonate, persulfate, ozone or ferrate, such as sodium percarbonate, sodium persulfate, ozone, sodium ferrate, etc., and can also be nitric acid, sulfuric acid, sodium hypochlorite, etc.
Particularly, the middle upper part of the side wall of the potential regulating pool is provided with a sludge discharge port, the sludge discharge port is arranged on the side wall opposite to the introducing port, and the sludge discharge port is connected with a sludge discharge pipe to discharge oil sludge in the regulating pool out of the regulating pool.
Particularly, the opening height of the sludge discharge port is lower than that of the introducing port; the height difference between the two is 20-100cm, preferably 50 cm.
Particularly, one end of the sludge discharge pipe extends to the lower part in the regulating tank through the sludge discharge port, and the sludge inlet end of the sludge discharge pipe is 150-200mm away from the bottom of the regulating tank.
The first fixed cross beam is fixedly arranged at the top of the adjusting tank along the length direction or the width direction of the adjusting tank and is positioned on the central line of the width direction or the length direction of the adjusting tank, and the cross beam and the side wall in the width direction or the side wall in the length direction of the adjusting tank are fixedly connected and fixed at the top of the adjusting tank.
Particularly, the distance between the partition plate and the side wall of the cell in the width direction close to the partition plate is 1/4-1/2, preferably 1/4-1/3, and more preferably 1/3 of the length of the cell.
The baffle is parallel to the side wall of the adjusting tank in the width direction, the two sides of the baffle are fixed with the side wall of the adjusting tank in the length direction respectively, the top of the baffle is flush with the top of the potential adjusting tank, the height of the baffle is smaller than the depth of the adjusting tank, and a relatively independent oxidation-reduction potential monitoring area is formed between the baffle and the side wall of the adjusting tank in the width direction, close to the baffle.
Particularly, the distance from the bottom of the partition plate to the bottom of the potential regulating pool is 300-900mm, and preferably 500 mm.
Wherein the ORP monitor is arranged in an oxidation-reduction potential monitoring area between the partition plate and the side wall of the regulating tank in the width direction to which the partition plate is close, and the distance between the ORP monitor and the partition plate preparation is 100-150 mm; the probe of the ORP monitor is at a distance of 600-800mm, preferably 700mm, from the bottom of the cell.
In particular, the first mechanical agitator is disposed in a relatively independent mechanical agitation zone formed between the partition wall and the side wall on the width or length direction side of the conditioning tank remote from the partition wall, and the distance between the installation position of the first mechanical agitator and the side wall on the width direction side of the conditioning tank remote from the partition wall is 1/2-1/4, preferably 1/3-1/4, and more preferably 1/3 of the length of the conditioning tank.
Particularly, the first mechanical stirrer is arranged at the same position as the distance between two side walls in the length direction of the regulating reservoir.
The settling tank is used for carrying out precipitation treatment on the oil sludge with the oxidation-reduction potential adjusted, solid-liquid separation is carried out under the action of gravity, and crude oil after the solid-liquid separation is discharged from the upper part of the settling tank and collected; and conveying the settled slurry after solid-liquid separation to the cleaning tank through a sludge discharge pipe.
Particularly, an oil receiving port is formed in the upper part of the side wall of the settling tank and is connected with an oil receiving pipe, and the separated crude oil is discharged from the oil receiving port and is collected through the oil receiving pipe; and a sludge discharge port of the settling tank is arranged on the side wall of the middle upper part of the settling tank and is connected with a sludge discharge pipe to discharge the settled slurry in the settling tank.
Particularly, the opening height of a sludge discharge port on the settling tank is lower than that of an oil receiving port; the height difference between the two is 30-100cm, preferably 50 cm.
Particularly, one end of the sludge discharge pipe extends to the lower part in the settling tank through the sludge discharge port, and the distance from the sludge inlet end of the sludge discharge pipe to the bottom of the settling tank is 150-200 mm.
Wherein, belt cleaning device is including wasing jar, second mechanical agitator, second fixed cross beam, wherein: the second fixed cross beam is arranged at the top of the cleaning tank; and the second mechanical stirrer is fixedly connected with the second fixed cross beam, extends into the cleaning tank, and stirs the precipitated slurry and the chemical degreasing agent introduced into the cleaning tank.
In particular, the cleaning tank has a cylindrical shape, a rectangular parallelepiped shape, a square shape, and preferably a cylindrical shape.
And the second fixed cross beam is fixedly arranged at the top of the cleaning tank along the diameter direction of the cleaning tank.
In particular, the second mechanical agitator is vertically installed at a position on a center line in a height direction of the wash tank.
In particular, the stirring shaft of the second mechanical stirrer coincides with the central axis (i.e., the height-direction central line) of the washing tank.
Particularly, the distance from the bottom of the second stirrer to the bottom of the cleaning tank is 100 mm and 500mm, preferably 300 mm; the ratio of the diameter of the stirring blade of the stirrer to the diameter of the cleaning tank is 1: 2-5, preferably 1: 3.
wherein, the centrifuge is a horizontal centrifuge, preferably a horizontal spiral discharge sedimentation centrifuge.
Particularly, slurry pumps are respectively arranged on pipelines connecting the potential adjusting device, the settling tank, the cleaning device and the centrifuge and are respectively used for pumping the slurry in the potential adjusting device to the settling tank, conveying the slurry in the settling tank to the cleaning device and pumping the slurry in the cleaning device to the centrifuge.
Aiming at the characteristics of high oil content of oil sludge at the tank bottom, fine soil particles, low oxidation-reduction potential and high adsorption strength of crude oil and soil particles, the invention develops a set of technologies based on oxidation-reduction potential adjustment, gravity settling, medicament cleaning, centrifugal separation and the like to realize the separation of the crude oil and the soil particles and the recycling of the crude oil.
Compared with the prior art, the invention has the following advantages:
the treatment design structure is simple, the treatment efficiency is high, and in the process of treating the oil sludge at the bottom of the oil field tank by adopting the treatment equipment, the dosage of the oil removing agent added in the cleaning tank is small, the concentration of the oil removing agent in the cleaning tank is reduced, and the environmental pollution is reduced;
in the process of cleaning the oil sludge at the tank bottom by adopting the oil removing agent, the using amount of the oil removing agent is large, the concentration of the cleaned oil removing agent is high and is usually 3-6%, and the concentration of the oil removing agent in the cleaning tank is lower than 1%.
The treatment equipment provided by the invention is adopted to firstly adjust the oxidation potential of the tank bottom oil sludge, improve the oxidation-reduction potential of the oil sludge, reduce the adsorption capacity, adsorption force and adsorption strength of the soil in the oil sludge to crude oil, so that the crude oil in the tank bottom oil sludge is easy to separate from the soil and sand grains, most of the crude oil contained in the oil sludge is removed before the oil sludge is subjected to chemical cleaning treatment, and the separation efficiency of the crude oil and the sand grains in the tank bottom oil sludge is improved.
The oil sludge at the bottom of the oil field tank is treated by the treatment equipment, an external heating source is not needed, and the power consumption is low;
in the process of treating tank bottom oil sludge by the treatment equipment, an organic solvent is not required to be used for extracting crude oil, the addition amount of a used medicament is small, and water liquid after subsequent oil sludge centrifugal treatment can be recycled, so that the use cost of the medicament is low, the water consumption is small, the crude oil recovery process is simple, the treatment cost of the oil sludge is reduced, and the recovery cost of the crude oil is reduced;
By adopting the treatment equipment to treat the tank bottom oil sludge waste, the recovery efficiency of the crude oil in the tank bottom oil sludge is high, the crude oil is recovered thoroughly, the recovery rate reaches more than 80 percent, even 98 percent, namely the oil removal rate of the oil sludge reaches more than 80 percent, even 98 percent; and the treatment time is short, the treatment efficiency is high, the soil after centrifugal dehydration has low water content and low oil content (generally less than 2 percent), and can be directly stacked.
Drawings
FIG. 1 is a schematic diagram of an oil field tank bottom sludge treatment plant according to the present invention;
FIG. 2 is a schematic top view of a potential adjusting device of the treating apparatus of the present invention.
Description of the reference numerals
1. A potential regulating tank; 11. an introducing pipe; 12. a sludge discharge pipe; 13. a first mechanical agitator; 14. a partition plate; 15. an ORP monitor; 16. a slurry pump; 17. a first fixed cross member; 18. a potential monitoring area; 2. a settling tank; 21. collecting an oil pipe; 3. cleaning the tank; 31. a second mechanical agitator; 32. a second fixed cross member; 4. a centrifuge; 5. and (4) a valve.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
As shown in fig. 1, the oil field tank bottom sludge treatment equipment of the present invention comprises a potential adjusting device, a settling tank 2, a cleaning device and a centrifuge 4 which are connected in sequence by a connecting pipeline, wherein:
the potential adjusting device is used for improving the oxidation-reduction potential of oil sludge at the bottom of the tank and comprises a potential adjusting tank 1, a first mechanical stirrer 13 arranged in the adjusting tank, a partition plate 14, an ORP monitor 15 and a first fixed cross beam 17 arranged at the top of the potential adjusting tank.
And adding a potential regulating oxidant into the potential regulating pool to mix with the oil sludge, improving the oxidation-reduction potential of the oil sludge, and regulating the oxidation-reduction potential of the oil sludge to be between 10 and 1000mV (preferably between 15 and 50 mV). The oxidant is generally selected from percarbonate, persulfate, ozone or ferrate, such as sodium percarbonate, potassium percarbonate, sodium persulfate, ozone, sodium ferrate, etc., in the embodiments of the present invention, the oxidant is described as an example above, and other industrial oxidants that can be used in oil field are all suitable for use in the present invention, such as calcium hypochlorite, sodium perchlorate, sodium hypochlorite, nitric acid, etc.
The tank body of the potential regulating tank is cuboid, the top of the tank body is open, the periphery and the bottom of the tank body are closed, and the tank body is used for regulating the oxidation-reduction potential of oil sludge at the bottom of an oil field tank, improving the oxidation-reduction potential of the oil sludge, improving the oxidation-reduction potential to 10-1000mV, converting the oil sludge from a reduction state to an oxidation state, reducing the adsorption capacity and adsorption strength of the soil in the oil sludge to crude oil, and improving the separation efficiency of the crude oil and sand grains in the oil sludge at the bottom of the tank.
In the specific embodiment of the present invention, the length direction of the potential regulating reservoir is the left and right direction, the depth direction is the up and down direction, and the width direction is the front and back direction, that is, two side walls in the width direction of the regulating reservoir are the left and right side walls, and two side walls in the length direction are the front and back side walls; other methods are also applicable if the width direction of the adjusting tank is used as the left and right direction, and the length direction is the front and back direction, namely, the two sides of the adjusting tank in the length direction are the left and right side walls, and the two side walls in the width direction are the front and back side walls.
The depth of the potential regulating pool is not less than 1.5 m, and the ratio of the length to the width is 1.5-2: 1, preferably 1.5: 1.
An inlet (not shown) is provided in the upper part of the left side wall of the potential control tank, the inlet is connected to an inlet pipe 11, and sludge at the tank bottom and an oxidizing agent or/and water for controlling the oxidation-reduction potential are added to the control tank through the inlet pipe.
An oxidant for adjusting the oxidation-reduction potential of the oil sludge is input into a potential adjusting pool through an inlet pipe and is mixed with the oil sludge to improve the oxidation-reduction potential of the oil sludge; adjusting the oxidation-reduction potential of the oil sludge in the regulating tank to between 10mV and 100 mV; the commonly used oxidant is selected from percarbonate, persulfate, ozone or ferrate, such as sodium percarbonate, potassium percarbonate, sodium persulfate, ozone, sodium ferrate, etc.
Because the reason that partial fatlute solid content is high or viscosity is big, in order to increase the separation rate of crude oil soil, still need make up water in the fatlute in the potential regulating reservoir, water liquid is inputed into the potential regulating reservoir by the induction pipe, mixes with fatlute, and during the separation, the soil solid reaches 1 with the proportion of water in the fatlute: (4-6), the crude oil is rapidly separated from the soil surface.
And a sludge discharge port (not shown in the drawing) is formed in the middle upper part of the right side wall of the adjusting tank and the side wall of the other side opposite to the introducing port, the sludge discharge port is connected with a sludge discharge pipe 12, the sludge discharge pipe extends to the lower part in the adjusting tank through the sludge discharge port, the oil sludge with the oxidation-reduction potential adjusted is discharged out of the adjusting tank through a sludge pump 16 and conveyed into a settling tank through a sludge pump, the height of the sludge discharge port is lower than that of the introducing port, and the height difference between the sludge discharge port and the introducing port is 20-100cm, preferably 50 cm. The sludge discharge pipe extends to the lower part in the regulating reservoir through the sludge discharge port, and the sludge inlet end of the sludge discharge pipe is 150-200mm away from the bottom of the regulating reservoir.
Set up first mechanical agitator 13, baffle 14 and ORP monitor (being oxidation-reduction potential monitor) 15 in the potential control pond, the top of potential control pond sets up first fixed cross beam 17, wherein:
the first fixed cross beam is fixedly arranged at the top of the regulating reservoir along the length direction or the width direction of the regulating reservoir, is positioned on the central line of the width direction or the length direction of the regulating reservoir (namely, the distance from the first fixed cross beam to the side wall of the width direction or the length direction of the regulating reservoir is the same), and is fixedly connected (such as welding, riveting, bolt connection and the like) with the left side wall, the right side wall or the front side wall and the rear side wall of the regulating reservoir and is fixed at the top of the regulating reservoir. In the embodiment of the invention, the first fixed cross beam is fixedly connected with the left side wall and the right side wall of the adjusting tank and is positioned on the central line of the front-back direction (namely the width direction) of the adjusting tank, as shown in fig. 1 and 2.
The first mechanical stirrer and the first fixed cross beam are fixed together in a fixed connection mode, are vertically arranged in the potential regulating pool, and the stirring shaft of the first mechanical stirrer is consistent with the depth direction of the regulating pool and extends into the regulating pool to stir and mix oil sludge, oxidant and water in the regulating pool uniformly to prepare the oil sludge with improved oxidation-reduction potential. The first mechanical agitator is positioned close to the left side wall of the conditioning tank at a distance of 1/3 (typically 1/4-1/2, preferably 1/4-1/3) from the left side wall of the conditioning tank length; and is located at the middle position in the front-back direction of the regulating reservoir (i.e. the same distance between the front and back side walls of the regulating reservoir), as shown in fig. 1 and 2.
The first mechanical stirrer is selected from a propeller stirrer, a turbine stirrer, a paddle stirrer or a helical ribbon stirrer, and is preferably a paddle stirrer; the ratio of the diameter of the stirring blade of the stirrer to the length of the regulating tank is (1-3): 9, preferably 2: 9; the distance between the bottom of the stirrer and the bottom of the regulating pool is 100 mm and 300mm, preferably 300 mm. The width of the stirring blade was 50mm, and the rotation speed was 60 rpm.
In the embodiment of the present invention, the stirrer is exemplified by a paddle stirrer, and other stirrers used in the art for mixing materials are suitable for the present invention, such as a turbine type or a propeller type stirrer.
The partition plate 14 is vertically arranged in the potential regulating tank, the partition plate is parallel to the left side wall and the right side wall of the regulating tank, is close to the right side wall of the regulating tank, is spaced from the right side wall by 1/3 (usually 1/4-1/2, preferably 1/4-1/3) of the length of the regulating tank, is fixed with the front side wall and the rear side wall of the regulating tank respectively at two sides, is flush with the top of the potential regulating tank at the top, is shorter than the depth of the regulating tank, and forms a relatively independent oxidation-reduction potential monitoring area 18 with the right side wall, as shown in fig. 1 and 2; after the oil sludge, the oxidant and the water are fully and uniformly mixed, the mixture enters an oxidation-reduction potential monitoring area from the lower end of the partition plate, the oxidant is ensured to be mixed with the oil sludge at the bottom of the tank entering the regulating tank, and meanwhile, the disturbance of the newly added oxidant to the ORP monitor is avoided; the distance between the bottom of the partition board and the bottom of the potential regulating pool is 300-900mm, preferably 500 mm.
The ORP monitor is arranged in an oxidation-reduction potential monitoring area between the partition plate and the side wall on the right side of the regulating tank and is used for monitoring the oxidation-reduction potential of the mixed liquid oil sludge after the oil sludge and the oxidant fully react, as shown in figures 1 and 2.
The distance between the installation position of the ORP monitor and the right side wall of the regulating tank is 100-150 mm; the distance from the probe of the ORP detector to the bottom of the regulating reservoir is 600 mm and 800mm, preferably 700 mm. And after detecting that the oxidation-reduction potential of the oil sludge in the regulating tank reaches-50 mV by an ORP monitor, conveying the obtained regulating oil sludge into a settling tank for settling treatment.
A support is arranged on the side wall of one side, facing the oxidation epoxy potential detection area, of the partition board, the support is perpendicular to the partition board, the distance from the top end of the support to the partition board is 100-150mm, and an ORP monitor is fixedly arranged at the top end of the support. 2-3 supports are arranged on the partition plate, and the ORP detection probe is fixed. The disassembly is convenient.
The mud pipe is provided with a valve 5 which is used for matching the opening or closing of the pump.
As shown in fig. 1, the settling tank 2 is used for settling the oil-mud slurry with the oxidation-reduction potential adjusted, the oil-mud slurry conveyed into the settling tank by the mud pump is stood in the settling tank, solid-liquid separation is carried out under the action of gravity, namely fine soil particles and oil are separated, and the separated soil is settled to the lower part of the settling tank to form settled mud; while the crude oil floats on the upper part.
An oil receiving port (not shown in the figure) is formed in the side wall of the upper part of the settling tank and connected with an oil receiving pipe 21, and the separated crude oil is discharged from the oil receiving port and collected through the oil receiving pipe.
The middle upper side wall of the settling tank is provided with a settling tank mud discharging port (not shown in the attached drawing), the mud discharging port is connected with a mud discharging pipe 12, the mud discharging pipe extends to the bottom of the settling tank through the mud discharging port, the mud discharging pipe on the outer side of the settling tank is connected with a mud pump, settled mud is discharged out of the settling tank through the mud pump and conveyed into the cleaning tank 3 through the mud discharging pipe, the height of the mud discharging port of the settling tank is lower than that of the oil receiving port, and the height difference between the mud discharging port and the oil receiving port is 30-100cm, preferably 50 cm. The sludge discharge pipe extends to the lower part of the settling tank through the sludge discharge port, and the sludge inlet end of the sludge discharge pipe is 150-200mm away from the tank bottom of the settling tank.
As shown in fig. 1, the cleaning apparatus includes a cleaning tank 3, a second mechanical agitator 31, and a second fixed beam 32, wherein: the second fixed cross beam is arranged at the top of the cleaning tank; the second mechanical stirrer is fixedly connected with the second fixed cross beam, extends into the cleaning tank, and stirs the precipitated slurry and the chemical degreasing agent introduced into the cleaning tank
The cleaning tank 3 is cylindrical, the top of the cleaning tank is open, the periphery and the bottom of the cleaning tank are closed, a chemical degreasing agent is added into the cleaning tank, and under the action of the chemical degreasing agent, crude oil contained in the settled slurry after settlement treatment is further removed, so that an upper layer of crude oil and a mud-water mixture settled on a lower layer are obtained.
The cleaning tank may have any shape, for example, a rectangular parallelepiped shape, a square shape, a cylindrical shape, etc., and a cylindrical shape is exemplified in the embodiment of the present invention.
Set up second mechanical agitator 31 in the washing jar, wash the tank deck and set up second fixed cross beam 32, wherein:
the second fixed cross beam is fixedly arranged on the top of the cleaning tank along the diameter direction of the cleaning tank, and the second fixed cross beam is fixedly connected (such as welded, riveted, bolted and the like) with the side wall of the cleaning tank and fixed on the top of the cleaning tank.
If the washing tank is in other shapes, the second fixed beam is arranged on the upper part of the central plane along the height direction of the washing tank, for example, in a rectangular parallelepiped shape, and the second fixed beam is fixedly arranged on the top of the washing tank along the length direction or the width direction of the regulating reservoir and is positioned on the central line of the width direction or the length direction of the washing tank.
The second mechanical stirrer and the second fixed cross beam are fixed together in a fixed connection mode, the second mechanical stirrer and the second fixed cross beam are vertically arranged in the cleaning tank, a stirring shaft of the second mechanical stirrer is consistent with the height direction of the cleaning tank, the stirring shaft of the second mechanical stirrer is superposed with the central axis (namely the central line of the height direction) of the cleaning tank, and the distance from the bottom of the stirrer to the bottom of the cleaning tank is 500mm, preferably 300 mm; the ratio of the diameter of the stirring blade of the stirrer to the diameter of the cleaning tank is 1: 2-5, preferably 1: 3. the width of the stirring paddle is 50mm, and the rotating speed is 60 rpm;
The second mechanical stirrer is used for fully mixing the added active oil removal agent in the cleaning tank with the precipitated slurry, providing hydraulic shearing force for removing crude oil contained in the precipitated slurry and improving the separation efficiency of the crude oil;
the dosage of the chemical degreasing agent added in the cleaning tank and the weight ratio of the settled mud in the cleaning tank are less than 0.5 percent, and 0.2 to 0.5 percent is preferred.
The chemical oil remover comprises a dispersant and a surfactant, wherein the dispersant is selected from sodium silicate, sodium phosphate or sodium pyrophosphate, and is preferably sodium silicate; the surfactant is one or more selected from Sodium Dodecyl Benzene Sulfonate (SDBS), alkylphenol ethoxylates (OP), petroleum sulfonate (petroleum sulfonate), sorbitan acid ester (Span), polyoxyethylene sorbitan acid ester (Tween), etc., preferably SDBS.
The mass ratio of the dispersing agent to the surfactant in the oil removing agent is 1-3: 1, preferably 1: 1.
the embodiments of the present invention are described only by way of sodium silicate and dodecylbenzene sulfonic acid, and the degreasing agents used for chemical cleaning in the art are all applicable to the present invention.
An oil receiving port (not shown in the figure) is formed in the side wall of the upper part of the cleaning tank and connected with an oil receiving pipe 21, and crude oil cleaned from the settled slurry is discharged from the oil receiving port and collected through an oil receiving guide pipe.
The side wall of the middle upper part of the cleaning tank is provided with a cleaning tank mud discharging port (not shown in the attached drawing), the mud discharging port is connected with a mud discharging pipe 12, the mud discharging pipe extends to the bottom of the cleaning tank through the mud discharging port, the mud discharging pipe on the outer side of the cleaning tank is connected with a mud pump, the cleaned mud-water mixture is discharged out of the cleaning tank through the mud pump and conveyed into the centrifuge 4 through the mud discharging pipe, the height of the mud discharging port of the cleaning tank is lower than that of the oil receiving port, and the height difference between the mud discharging port and the oil receiving port is 30-80cm, preferably 50 cm. The mud pipe extends to the lower part in the cleaning tank through the mud outlet, and the mud inlet end of the mud pipe is 150-200mm away from the tank bottom of the cleaning tank.
The centrifuge 4 centrifugalizes the mud-water mixture at the lower layer after being processed by the cleaning tank, under the action of centrifugal force, the silt particles with higher density are separated from the water liquid, the separated water liquid is discharged from a water outlet of the centrifuge, and the centrifuged water liquid flows back to the oxidation-reduction potential regulating tank or is directly discharged through a pump and a return pipe (not shown in the attached drawing); the centrifuged sediment (silt particles) is discharged from a sludge discharge port of the centrifuge.
In the specific embodiment of the invention, the centrifuge is selected from a horizontal centrifuge (a horizontal spiral discharge sedimentary centrifuge, such as products of Jiangsu Hua centrifuge manufacturing Co., Ltd., Hengtai centrifuge manufacturing factory in Wuxi city, etc.), and other centrifuges are all suitable for the invention.
The oil content in the silt particles discharged from the centrifuge is lower than 2 percent (usually 0.2 to 1.5 percent), the oil removal rate of oil field tank bottom oil sludge reaches 80 to 99 percent, namely the recovery rate of crude oil in the tank bottom oil sludge reaches 80 to 99 percent, and usually reaches more than 90 percent.
The working principle of the oil field tank bottom oil sludge treatment equipment is as follows:
conveying oil field tank bottom oil sludge waste, oxidant and/or water into a potential regulating tank through an inlet pipe of the potential regulating tank, starting a first mechanical stirrer, uniformly stirring and mixing tank bottom oil sludge, oxidant and water, feeding the uniformly mixed oil sludge into an oxidation-reduction potential monitoring area from the lower part of a partition plate, monitoring the oxidation-reduction potential of the uniformly mixed oil sludge by using an ORP monitor until the potential of the oil sludge is regulated to-50 mV to 50mV, and discharging the oil sludge from the potential regulating tank to a settling tank through a sludge discharge pipe by using a sludge pump;
standing the oil-mud slurry in a settling tank, settling for 30-50min under the action of gravity, separating oil and sludge, floating the separated crude oil on the upper part, and discharging and collecting the crude oil through an oil collecting port on the upper part of the settling tank through an oil collecting pipe; the mud is settled to the lower part of the settling tank to form settled mud, and the settled mud is discharged from the settling tank to the cleaning tank through a mud discharge pipe under the action of a mud pump; the oil content in the settled mud is 5-65% of that of the tank bottom oil sludge, namely the recovery rate of the crude oil is 35-95%;
Starting a second mechanical stirrer, adding a chemical degreasing agent into the cleaning tank in a stirring state, uniformly mixing the settled slurry and the degreasing agent, reducing the wettability of the crude oil and the soil by the chemical degreasing agent, changing the interfacial tension of oil and water, and enabling the crude oil to fall off from the surface of the soil under the stirring disturbance; the density difference between the soil particles after the crude oil is removed and the mixed solution is increased, and the soil particles and the mixed solution are deposited to the bottom of the cleaning tank under the action of gravity to form a mud-water mixture; the fallen crude oil floats on the upper part of the cleaning tank; discharging and collecting the fallen crude oil from an oil collecting port at the upper part of the cleaning tank through an oil collecting pipe; the mud-water mixture settled at the lower part of the cleaning tank is discharged from the situation tank to the centrifuge through the mud discharge pipe under the action of the mud pump;
starting a centrifugal machine, carrying out centrifugal treatment on the mud-water mixture, and directly discharging or refluxing the centrifuged supernatant clear liquid to a potential regulating tank; the centrifugal sediment is discharged from a mud discharge port of the centrifugal machine, the oil content in the centrifugal sediment (silt) is 2-20% of that of the tank bottom oil sludge, and the crude oil recovery rate of the tank bottom oil sludge after the treatment equipment is adopted for treatment reaches 80-98%.
The treatment apparatus of the present invention can be operated intermittently or continuously:
(1) discontinuous operation
Adding oil sludge and water at the bottom of the tank into an oxidation-reduction potential regulating tank, adding a potential regulating oxidant according to an oxidation-reduction potential monitoring value, uniformly stirring, and pumping the oil sludge into a gravity settling tank; after free precipitation and separation in a gravity settling tank, pumping the settled slurry to a chemical cleaning tank, adding a chemical degreasing agent (namely a dispersing agent and a surfactant), stirring for at least 30 minutes, pumping the separated slurry and water mixture to a centrifuge, and performing centrifugal separation;
(2) continuous operation
Continuously adding tank bottom oil sludge, water and a potential regulating oxidant into an oxidation potential regulating tank; stirring, and setting the retention time of the mud-water mixture in an oxidation-reduction potential regulating tank, a gravity settling tank and a chemical cleaning tank to be 30 minutes.
The main component content of the tank bottom oil sludge separated by the oil field tank bottom oil sludge treatment equipment is as follows:
oil content of 10-60% and water content of 20-70%
Solid content of 5-60%, and solid particle diameter of 50-2000um
Oxidation-reduction potential of < -100mV
The tank bottom oil sludge treated by the treatment equipment is not limited to the components, and other oil field tank bottom oil sludge wastes in the field can be treated by the treatment equipment.
Test examples
The oil field tank bottom oil sludge treatment equipment is used for treating the bottom sludge of an oil storage tank of an oil field, and the average oil content of the tank bottom oil sludge of the oil storage tank of the oil field is 19.5 percent; the average water content was 49.5%; the average solids content was 31.0%; the particle size of the soil solid particles is less than 1000 um; the oxidation-reduction potential of the oil sludge at the tank bottom is-281.7 mV.
1. Adjustment of redox potential
Oil field tank bottom oil sludge and water are added into a potential regulating pool 1 through an inlet pipe, and the ratio of the mass of the solid of the oil sludge added into the potential regulating pool to the mass of the added water is 1: 4 (typically 1 (4-8), preferably 1 (4-6)), and then turning on the first mechanical stirrer at a stirring speed of 60rpm (typically 50-100 rpm);
adding potential additive (namely oxidant) chlorine dioxide into a potential regulation pool through an inlet by an inlet pipe, adding the oxidant while stirring, wherein the stirring speed is 60rpm (usually 50-100rpm), and monitoring the oxidation-reduction potential of the mixture (oil sludge) entering an oxidation-reduction potential monitoring area in the regulation pool by an ORP monitor until the oxidation-reduction potential is kept at 42mV (usually 10-100mV, preferably 15-50 mV); the mass ratio of the added oxidant to the solid of the tank bottom oil sludge added in the regulating reservoir is 1: 100 (usually (0.5-1.5):100), then stirring for 15-20min, starting a slurry pump 16, and conveying the mixture (oil slurry) after the potential is adjusted to the settling tank 2;
2. Sedimentation treatment
Conveying the oil-mud slurry subjected to potential adjustment treatment to a settling tank through a mud pipe under the action of a mud pump, standing for at least 30min (preferably 30-45min), performing solid-liquid separation under the action of gravity, separating fine soil particles from oil, floating the separated oil on the upper part of the settling tank, and discharging and collecting the oil from an oil receiving port on the upper part of the settling tank; fine soil particles are settled to the lower part of the settling tank, and settled settling slurry is conveyed to the cleaning tank through a slurry pump; the oil content of the soil in the settled mud is 3.6 percent, namely the recovery rate of the crude oil is 81 percent;
3. cleaning treatment
Conveying the settled slurry into a cleaning tank through a sludge discharge pipe under the action of a slurry pump, starting a second mechanical stirrer, adding chemical degreasing agent sodium silicate and SDBS into the cleaning tank under the stirring state, wherein the stirring speed is 60rpm, the ratio of the mass of the added degreasing agent to the mass of the settled slurry is 0.3:100 (usually (0.2-0.5): 100), and the mass ratio of the sodium silicate to the SDBS is 1: 1 (typically 1-3: 1);
stirring and cleaning for at least 30min, stopping stirring to obtain an upper crude oil and a mud-water mixture precipitated on a lower layer, and discharging the upper crude oil from an oil receiving port at the upper part of the cleaning tank; starting a slurry pump, and conveying the sludge-water mixture settled on the lower layer to a centrifugal machine for centrifugal treatment;
4. Centrifugal treatment
Conveying the mud-water mixture after cleaning treatment to a horizontal spiral discharge sedimentation centrifuge (Jiangsu Huada centrifuge manufacturing Co., Ltd.) through a mud discharge pipe under the action of a mud pump, and carrying out centrifugal treatment, wherein the centrifugal rate is 800-1100rpm, the oil content in the centrifuged bottom mud soil is 0.8% (the final oil content in the soil is 0.8%, the oil content is less than 2%), the total oil removal rate of oil sludge at the bottom of an oil field tank reaches 95.8%, namely the total recovery rate of crude oil is 95.8%;
the above-described embodiments of the present invention are merely exemplary and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The oil field tank bottom oil sludge treatment equipment is characterized by comprising a potential adjusting device, a settling tank, a cleaning device and a centrifugal machine which are sequentially connected through a pipeline, wherein the potential adjusting device is used for adjusting and improving the oxidation-reduction potential of tank bottom oil sludge introduced into the adjusting device.
2. The process apparatus of claim 1, wherein the potential adjusting device comprises a potential adjusting tank, a first mechanical stirrer, a baffle, an ORP monitor, and a first fixed beam, wherein: the partition plate and the ORP monitor are arranged in the potential regulating pool; the first fixed cross beam is arranged at the top of the potential regulating pool; and the first mechanical stirrer is fixedly connected with the first fixed cross beam and is used for stirring and treating tank bottom oil sludge, potential regulating oxidant and water introduced into the potential regulating tank.
3. The treatment apparatus according to claim 2, wherein the tank body of the potential regulating tank has a rectangular parallelepiped shape with an open top and closed peripheries and bottoms; the baffle plate is arranged on the side wall close to one side of the regulating reservoir in the width or length direction, a relatively independent oxidation-reduction potential monitoring area is formed between the baffle plate and the side wall close to the regulating reservoir in the width or length direction, and a relatively independent mechanical stirring area is formed between the baffle plate and the side wall far away from the regulating reservoir in the width or length direction; the ORP detector is arranged in the formed oxidation-reduction potential monitoring area and used for monitoring the oxidation-reduction potential of the oil sludge in the oxidation-reduction potential monitoring area.
4. The treatment apparatus according to claim 2 or 3, wherein the partition is spaced from the widthwise side wall of the conditioning tank adjacent to the partition by a distance of 1/2 to 1/4, preferably 1/3, of the length of the conditioning tank.
5. The treatment apparatus according to claim 2 or 3, wherein the first mechanical agitator is provided in a relatively independent mechanical agitation zone formed between the partition wall and the side wall on the side of the width or length direction of the conditioning tank remote from the partition wall, and the first mechanical agitator is spaced from the side wall on the side of the width or length direction of the conditioning tank remote from the partition wall by a distance of 1/4 to 1/2, preferably 1/3, of the length of the conditioning tank and by the same distance as the side wall on the side of the length or width direction of the conditioning tank.
6. The treatment apparatus as set forth in any one of claims 1 to 3, wherein the settling tank is adapted to perform a precipitation treatment of the oil-slurry whose oxidation-reduction potential has been adjusted, to perform solid-liquid separation under the action of gravity, and the crude oil after the solid-liquid separation is discharged from the upper portion of the settling tank and collected; and conveying the settled slurry after solid-liquid separation to the cleaning tank through a sludge discharge pipe.
7. The process apparatus of any one of claims 1 to 3, wherein the cleaning device comprises a cleaning tank, a second mechanical agitator, and a second fixed beam, wherein: the second fixed cross beam is arranged at the top of the cleaning tank; and the second mechanical stirrer is fixedly connected with the second fixed cross beam, extends into the cleaning tank, and stirs the precipitated slurry and the chemical degreasing agent introduced into the cleaning tank.
8. The processing apparatus according to claim 7, wherein said second mechanical agitator is installed vertically at a position on a center line in a height direction of said wash tank.
9. A treatment plant according to any of claims 1-3, characterized in that the centrifuge is selected from a horizontal centrifuge, preferably a horizontal screw discharge decanter centrifuge.
10. The process apparatus as claimed in any one of claims 1 to 3, wherein slurry pumps are provided in the pipes connecting the potential adjusting means, the settling tank, the cleaning means and the centrifuge, respectively, for pumping the slurry in the potential adjusting means to the settling tank, pumping the slurry in the settling tank to the cleaning means, and pumping the slurry in the cleaning means to the centrifuge, respectively.
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|---|---|---|---|---|
| CN114195224A (en) * | 2021-12-17 | 2022-03-18 | 北京华夏安盛科技有限公司 | Preparation method of sludge sewage oil removal agent |
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