CN103693823B - The treatment process that a kind of oily sludge is innoxious - Google Patents

The treatment process that a kind of oily sludge is innoxious Download PDF

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CN103693823B
CN103693823B CN201210366104.5A CN201210366104A CN103693823B CN 103693823 B CN103693823 B CN 103693823B CN 201210366104 A CN201210366104 A CN 201210366104A CN 103693823 B CN103693823 B CN 103693823B
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oily sludge
extraction
treatment
solid
mud cake
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CN201210366104.5A
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CN103693823A (en
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杨岳
刘发强
刘光利
任立鹏
贾媛媛
周霞
何琳
张媛
巫树锋
李常青
江岩
王军
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中国石油天然气股份有限公司
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/10Biofuels, e.g. bio-diesel
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00Technologies for the production of fuel of non-fossil origin
    • Y02E50/30Fuel from waste, e.g. synthetic alcohol or diesel
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00Technologies for wastewater treatment
    • Y02W10/30Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37Wastewater or sewage treatment systems using renewable energies using solar energy

Abstract

The present invention relates to a kind for the treatment of process of oily sludge, be specially adapted to the oily sludge produced in sewage from oil refinery treating processes.First oily sludge is sent into mummification room, greenhouse, natural mummification under the condition of sufficient sunlight, then mud cake is mixed with extraction agent at normal temperatures, carry out homogeneous extraction, after extraction terminates, mixture is sent into solid-liquid centrifugation separator, isolated liquid directly carries out freshening, and the solid residue after separation mixes with coal after super-dry, can use as the fuel of coal firing boiler.Treatment process oil-sludge treatment energy consumption of the present invention is low, and technical process is short, facility investment is low, can realize the harmless treatment of oily sludge.

Description

The treatment process that a kind of oily sludge is innoxious

Technical field

The present invention relates to the treatment process that a kind of oily sludge is innoxious, particularly refinery, Waste water treatment factory produce oily sludge through solar energy greenhouse mummification, extraction, the treatment process of the direct freshening of extraction product.

Background technology

Petrochemical Enterprises produces a large amount of oily sludges in refining of petroleum and wastewater treatment process, and they are mainly from oil trap, flotation cell, residual active sludge, dehydrating of crude oil tank, storage tank and slop oil tank etc.These sludge components are complicated, belong to more stable heterogeneous system, and mixing fully, and viscosity is comparatively large, and solid phase is difficult to thorough sedimentation, disposal of oily sludge difficulty.At present, in China's oil chemical industry, about produce 800,000 tons of oily sludges every year on average.Along with the continuous expansion of enterprise's production equipment scale, corresponding waste sludge discharge total amount and kind are also increasing step by step, make pollutant discharge of enterprise total amount and pollution abatement costs also present the trend of rising.In recent years, what require along with national environmental protection statutory standard improves constantly, and law enforcement for environmental protection dynamics continues to increase, and in production process, institute generates Environmental capacity and the recycling of solid waste, has become the difficult problem perplexing oil and refining of petroleum industry." the prevention and control of environmental pollution by solid wastes method " of new revision proposes stricter requirement to solid waste control.The treatment and utilization of solid waste has been listed in the important process content of building economies society.

Development along with national economy and the attention to environment protection, the research of increasing institutions conduct to disposal of oily sludge.But most technology is because processing cost is high, technical process length, complicated operation, treatment effect are undesirable or other many-sided reasons, and the treatment technology of oily sludge, is difficult to be widely applied formation suitability for industrialized production.At present, oily sludge majority adopts air storage or land-fill method process, general containing materials such as hydro carbons, benzene homologues, phenols and anthracene classes in these mud, and with stench and toxicity, if directly contact with physical environment, larger pollution can be caused to soil, water body and vegetation, also cause the waste of petroleum resources.

CN1488591A proposes a kind for the treatment of process of oily sludge, and oily sludge is carried out mechanical dehydration, then mixes with extraction agent and preheating, extraction heat-processed is carried out after mixing homogeneous, then carry out solid-liquid separation, liquid phase enters coker, and solid phase is as fuel.This technology needs to carry out preheating to material in extraction process, and preheating temperature is 50 ~ 100 DEG C, and in extraction process, service temperature is 100 ~ 150 DEG C, and energy expenditure is large; In oily sludge, moisture is too many, and extraction is not thorough, after residue also needs burn processing after mummification after extraction, just can reach innoxious effect.

CN1526797A proposes a kind of oily sludge extracting process, selects extraction agent to be light tar (under normal pressure boiling point 45 ~ 90 DEG C), sherwood oil, lightweight oil or C 5, utilize solvent to the solvency action of oil fuel in oily sludge, oily sludge Zhong Shui, oil be separated with mud.But the extractant condition of this technology is extraction temperature 45 ~ 55 DEG C, and in extraction process, energy expenditure is higher, and in this technology, oily sludge does not carry out deep dehydration to oily sludge before extraction, oily sludge oil extraction after extraction is not easily thorough.

CN1765781A proposes a kind for the treatment of process of oily sludge, adopt that extraction agent mixes with oily sludge, extracting, evaporating processed and solid-liquid separation, it is characterized in that the multistage or single-action multi-stage solvent extraction of multiple-effect steams method system, the operational condition of described multiple-effect multi-stage solvent extraction vapo(u)rization system is as follows: its first step adopts normal pressure, temperature is 95 ~ 115 DEG C, last step pressure is 0.01 ~ 0.60MPa, and temperature is 125 ~ 175 DEG C.This technology skill does not carry out deep dehydration process to oily sludge before extraction, in process, in oily sludge, moisture is too many, extract not thorough, in solid phase after separation, organic content is high, and needs to heat material in extraction process, needs multi-stage solvent extraction, technical process is long, equipment is many, and facility investment is large, and energy expenditure is large.

CN101633574A and CN101362979A proposes a kind for the treatment of process of oily sludge, mixes and uses as fuel, fail to recycle the oil in oily sludge after oily sludge being carried out modified, press filtration with coal.

CN101343137A proposes a kind for the treatment of process of oily sludge, carries out burning disposal after oily sludge is modified, dehydration, the process such as dry.In oily sludge drying process, energy consumption is high, and is easy to produce stench tail gas, produces new pollution.

Oily sludge is after general machinery (plate and frame(type)filter press, belt filter press, bag type filtering machine, horizontal helical type sludge dewatering equipment, folded spiral shell formula water extracter etc.) dehydration, wherein still containing a large amount of moisture (generally about 80%), most of moisture exists with various ways such as interstitial water, capillary water, planar water and Bound moisture, and these moisture form highly stable emulsified state with oil and solid, adopt treatment by extraction, the temperature (100 ~ 175 DEG C) that general needs are higher, and extraction is not easily carried out thoroughly; If adopt the process of mummification method to the oily sludge after mechanical dehydration, deviate from the water in mud, Gu destroy the stabilising system of wherein oil-water-formed, then extraction treatment (as CN200910237009.3 and CN200910079177.4) is adopted, such extraction is more thorough, the temperature milder (10 ~ 60 DEG C) that extraction needs.But the raw material being used as oily sludge extraction solvent at present mainly contains Industrial products or the wide boiling range combination solvents such as light tar, sherwood oil, petroleum naphtha, lightweight oil, benzene, toluene, butanone, although certain effect of extracting can be reached, but the oil length of the solid slag after extraction is still higher, simultaneously, if mud is through high temperature mummification, then need more energy expenditure (if the water ratio of oily sludge is reduced to 40% by 80%, mud per ton needs to evaporate 0.67 ton of water), generating a certain amount of tail gas in drying process also needs process up to standard.

Summary of the invention

For the deficiency that current contained Mud Treatment Technology exists, after developing a kind of greenhouse mummification dehydration of oily sludge, carry out the treatment process of normal temperature extraction freshening again.The object of the present invention is to provide a kind of oil that can fully reclaim in oily sludge, use range is wide, and disposal of oily sludge amount is large, can realize the method for oily sludge recycling and harmless treatment.In the method treating processes, energy expenditure is low, facility investment is few, technical process is short, strong with refinery process integration.

The present invention proposes a kind for the treatment of process of oily sludge, comprise the steps:

First oily sludge is sent into solar energy greenhouse mummification room, then the mud cake generated after abundant mummification and extraction agent mixing and stirring are extracted, after extraction terminates, mixture is sent into solid-liquid separator, isolated liquid directly carries out freshening, solid after separation mixes with coal after mummification, can use as the fuel of coal firing boiler, realize the harmless treatment effect of oily sludge.

Of the present invention is mixed solvent containing the extraction solvent in sludge treatment technique, by host A(85-100%(v/v)), secondary agent B(0-15%(v/v)), auxiliary agent C(0-5%(v/v)), composition, wherein host to be boiling range the be distillate of 110 ~ 135 DEG C, secondary agent B to be boiling range the be distillate of 140 ~ 150 DEG C, auxiliary agent C to be boiling range the be distillate of 80 ~ 100 DEG C.Distillate used is the distillate of petroleum products, waste oil in its composition and character and oily sludge has larger similarity, and the distillate that boiling range is 110 ~ 135 DEG C has good compatibility to the waste oil of boiling range low in oily sludge and the waste oil of high boiling range, to the solvability that the complicated oil compounds in oily sludge has had, boiling range is, the distillate of 140 ~ 150 DEG C waste oil to oily sludge more high boiling range has good solvability, and this host and secondary agent are also easy to extract and freshening.Boiling range is that the distillate of 80 ~ 100 DEG C realizes adjusting the object of main solvent as auxiliary agent.Low boiling fraction oil is volatile under extraction conditions, can produce the solution changing of the relative positions of local, make the transfer of material in extraction process more smooth and easy, and this cut is also the direct products of refining of petroleum, is easy to freshening in main solvent.

Present invention also offers a kind of concrete treatment process of oily sludge, comprise the steps:

(1) oily sludge that sewage work produces is sent into mummification room, greenhouse, nature mummification is carried out under the condition fully contacting sunlight, drying time is 6 ~ 20 days, within in drying process interval 0.5-1.5 days, with turning over mud machine, the sunny slope of mud and opaco are overturn, ensure, in drying process, aerobic reaction occurs, mummification room, greenhouse will be furnished with ventilation installation, in time the moisture of evaporation can be discharged, the water ratio generating mud cake after mummification drops to 15% ~ 40%, Gu destroy the stabilising system of oil-water in oily sludge-formed; The waste water produced in evaporative process sends into wastewater treatment equipment, discharges after process up to standard;

(2) mud cake formed after natural mummification in step (1), at 0 ~ 50 DEG C, preferably mixes with extraction agent at 25 ~ 45 DEG C, stirs 10 ~ 80min, preferably 30 ~ 50min, and the mixing quality of extraction agent and mud cake is than being (30 ~ 1): 1, preferably (15 ~ 2): 1;

(3) solidliquid mixture after extraction in step (2) is sent into solid-liquid separator, isolated liquid phase directly carries out freshening;

(4) in step (3), the isolated solid phase of solid-liquid separator enters drying plant, be 110 ~ 188 DEG C in temperature, preferably 120 ~ 150 DEG C, pressure is 20 ~ 100KPa(absolute pressure), preferably 40 ~ 80KPa(absolute pressure) under dry 5 ~ 100min, preferably obtain solid slag after 20 ~ 60min;

(5) solid residue step (4) obtained and bunker coal 1:(20 ~ 1000 in mass ratio) blending, preferred 1:(50 ~ 500), do fuel and use;

Solid-liquid separation of the present invention adopts natural subsidence to be separated or centrifugation.

Described drying plant is dividing wall type heat transfer equipment for drying, and comprise rotary kiln, various spin drier, paddle formula equipment drying machine etc., heating medium comprises high and low pressure saturated vapo(u)r, thermal oil, stack gas etc.

Oil in mud cake, after adding extraction agent, extracts by the mud cake formed after oily sludge mummification, and extraction process once can complete and also can carry out multi-stage solvent extraction and complete.

Oily sludge of the present invention comprises the oily sludge that oil field and Petrochemical Enterprises produce.

Its advantage of process for treating oil-containing sludge that the present invention adopts is: 1. directly contacted with sunlight by oily sludge, the greasy filth of black is conducive to absorbing a large amount of sun power and dehydration of generating heat, destroy the stabilising system that in oily sludge, " Gu oil-water-" is formed, be more conducive to extraction and carry out at a lower temperature; 2. oily sludge is after sun power dehydration, greatly reduce volume and the quality of oily sludge, alleviate the load of subsequent disposal, oily sludge only utilizes solar radiant energy in greenhouse drying process, greatly reduce the consumption of energy, and greenhouse drying process carries out in aerobic reaction, decrease the investment of stench vent gas treatment, achieve oil recovery and utilization in oily sludge; 3. adopt the solvent mixture being suitable for freshening, extracting power is stronger, and extraction temperature is low, decreases energy expenditure; Extraction number of times few, effect of extracting is good, process cost and facility investment low, decrease number of devices and plant construction investment; 4. the liquid phase after oily sludge extraction directly carries out freshening, decreases the equipment required for extractant regeneration and energy expenditure; 5. generate residue after extraction to mix with coal after super-dry, the fuel that can be used as coal firing boiler uses, and realizes the harmless treatment of oily sludge.

Embodiment

Following examples illustrate of the present invention, and embodiment and " % (v/v) " described in comparative example refer to volumn concentration, and all the other " % " do not marked are mass percentage.

Test the oily sludge adopted, take from Waste water treatment factory after centrifugation, water ratio is 70% ~ 90%, and oil length is 5% ~ 10%.

Horizontal helical type centrifuge: Shanghai threefold ring is protected Machinery Co., Ltd. and produced, model LW-250

Paddle formula desiccation machine: Tianhua Chemical Machinery & Automation Design Inst is produced, and model is JG-6

In oily sludge, the mensuration of water ratio is carried out according to method described in GB/T 212-2001.

In oily sludge, oil length measures, and carries out according to method described in GB/T 6504-2008.

Embodiment 1:

Solvent formula is: host selects the distillate of boiling range naphtha stream 110 ~ 125 DEG C of boiling ranges, accounts for 90%(v/v), secondary agent selects boiling range to be the distillate of 140 ~ 150 DEG C, account for 7%(v/v), auxiliary agent boiling range is the distillate of 80 ~ 100 DEG C, accounts for 3.0%(v/v), composition composite extractant.The water ratio certain company produced is 90%, oil length is the oily sludge of 5%, send into mummification room, greenhouse, place 20 days under the condition of sufficient sunlight, with turning over mud machine, greasy filth was overturn one time every 1 day, and keep mummification room well-ventilated, the water ratio finally generating mud cake is 35%, oil-containing 32%, then getting 1kg mud cake and mixed solvent is 1:8 hybrid extraction 30min in mass ratio, extraction temperature is 30 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 150 DEG C in temperature, pressure is 50KPa(absolute pressure) under evaporate 25min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:50 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 95.2%.

Comparative example 1:

Other processing condition are all identical with embodiment 1, and difference is that extraction solvent is light naphtha, boiling range 60 ~ 180 DEG C.That is: be 90% by water ratio, oil length is the oily sludge of 5%, send into mummification room, greenhouse, place 20 days under the condition of sufficient sunlight, with turning over mud machine, greasy filth was overturn one time every 1 day, and keep mummification room well-ventilated, the water ratio finally generating mud cake is 35%, oil-containing 32%, then 1kg mud cake and mixed solvent (host 90%(v/v) is got, secondary agent 7%(v/v), auxiliary agent 3%(v/v)) be 1:8 hybrid extraction 30min in mass ratio, extraction temperature is 30 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 150 DEG C in temperature, pressure is 50KPa(absolute pressure) under evaporate 25min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:50 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 78.9%.

Embodiment 2:

Solvent formula is: host selects the distillate of boiling range naphtha stream 110 ~ 125 DEG C of boiling ranges, accounts for 95%(v/v), secondary agent selects boiling range to be the distillate of 140 ~ 150 DEG C, account for 4%(v/v), auxiliary agent boiling range is the distillate of 80 ~ 100 DEG C, accounts for 1.0%(v/v), composition composite extractant.Be 85% by water ratio, oil length is the oily sludge of 7%, send into mummification room, greenhouse, place 15 days under the condition of sufficient sunlight, with turning over mud machine, greasy filth was overturn one time every 1 day, and keep mummification room well-ventilated, the water ratio finally generating mud cake is 34.2%, oil-containing 45.2%, then 1kg mud cake and mixed solvent is got, be 1:10 hybrid extraction 10min in mass ratio, temperature is 45 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 130 DEG C in temperature, pressure is 20KPa(absolute pressure) under evaporate 10min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:100 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 93.9%.

Comparative example 2:

Other processing condition are all identical with embodiment 2, difference is that employing No. 120 solvent oils are as extraction agent, that is: be 85% by water ratio, oil length is the oily sludge of 7%, send into mummification room, greenhouse, place 15 days under the condition of sufficient sunlight, with turning over mud machine, greasy filth was overturn one time every 1 day, the water ratio finally generating mud cake is 50%, oil-containing 20%, then 1kg mud cake and No. 120 solvent oils are got, be 1:10 hybrid extraction 10min in mass ratio, temperature is 45 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 130 DEG C in temperature, pressure is 20KPa(absolute pressure) under evaporate 10min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:100 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 74.6%.

Embodiment 3:

Solvent formula is: host selects the distillate of boiling range naphtha stream 110 ~ 125 DEG C of boiling ranges, accounts for 96%(v/v), secondary agent selects boiling range to be the distillate of 140 ~ 150 DEG C, account for 3%(v/v), auxiliary agent boiling range is the distillate of 80 ~ 100 DEG C, accounts for 1.0%(v/v), composition composite extractant.Be 70% by water ratio, oil length is the oily sludge of 10%, send into mummification room, greenhouse, place 20 days under the condition of sufficient sunlight, with turning over mud machine, greasy filth was overturn one time every 0.5 day, and keep mummification room well-ventilated, the water ratio finally generating mud cake is 15%, oil-containing 47%, then 1kg mud cake and mixed solvent is got, be 1:10 hybrid extraction 30min in mass ratio, temperature is 45 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 180 DEG C in temperature, pressure is 20KPa(absolute pressure) under evaporate 20min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:50 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 94.6%.

Comparative example 3:

Other processing condition are all identical with embodiment 3, and difference is the composition changing extraction agent.Host selects the distillate of boiling range naphtha stream 110 ~ 125 DEG C of boiling ranges, accounts for 95%(v/v), secondary agent selects boiling range to be the distillate of 140 ~ 150 DEG C, accounts for 5%(v/v).Be 70% by water ratio, oil length is the oily sludge of 10%, send into mummification room, greenhouse, place 20 days under the condition of sufficient sunlight, with turning over mud machine, greasy filth was overturn one time every 0.5 day, and keep mummification room well-ventilated, the water ratio finally generating mud cake is 15%, oil-containing 47%, then 1kg mud cake and mixed solvent is got, be 1:10 hybrid extraction 30min in mass ratio, temperature is 45 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 180 DEG C in temperature, pressure is 20KPa(absolute pressure) under evaporate 20min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:50 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 93.8%.

Embodiment 4:

Solvent formula is: extraction solvent host selects the distillate of boiling range naphtha stream 110 ~ 125 DEG C of boiling ranges, accounts for 85%; Secondary agent selects boiling range to be the distillate of 140 ~ 150 DEG C, accounts for 10%; Auxiliary agent boiling range is the distillate of 80 ~ 100 DEG C, accounts for 5.0%, composition composite extractant.Be 80% by water ratio, oil length is the oily sludge of 9%, send into mummification room, greenhouse, place 10 days under the condition of sufficient sunlight, with turning over mud machine, greasy filth was overturn one time every 1 day, and keep mummification room well-ventilated, the water ratio finally generating mud cake is 25%, oil-containing 32%, then 1kg mud cake and double solvents is got, be 1:8 hybrid extraction 30min in mass ratio, extraction temperature is 30 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 150 DEG C in temperature, pressure is 50KPa(absolute pressure) under evaporate 25min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:100 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 94.2%.Comparative example 4:

Other processing condition are all identical with embodiment 4, and difference changes the form of oily sludge dehydration, adopt here and directly extract.Namely solvent formula is: extraction solvent host selects the distillate of boiling range naphtha stream 110 ~ 125 DEG C of boiling ranges, accounts for 85%; Secondary agent selects boiling range to be the distillate of 140 ~ 150 DEG C, accounts for 10%; Auxiliary agent boiling range is the distillate of 80 ~ 100 DEG C, accounts for 5.0%, composition composite extractant.Be 80% by water ratio, oil length is the oily sludge of 9%, get 1kg mud cake directly and double solvents, be 1:8 hybrid extraction 30min in mass ratio, extraction temperature is 30 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 150 DEG C in temperature, pressure is 50KPa(absolute pressure) under evaporate 25min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:100 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 25.1%.

Comparative example 5:

Other processing condition are all identical with embodiment 4, and difference changes the form of oily sludge dehydration, adopt mummification dehydration here.Solvent formula is: the distillate of boiling range naphtha stream 110 ~ 125 DEG C of boiling ranges all selected by extraction solvent, accounts for 90%, and selection of auxiliary boiling range is the distillate of 80 ~ 100 DEG C, accounts for 10%, be 75% by water ratio, oil length is the oily sludge of 9%, send into paddle formula desiccation machine, it is 168 DEG C in temperature, pressure is that 75Kpa(is exhausted), the residence time is 55 minutes conditions, the water ratio finally generating mud cake is 35%, oil-containing 30%, then 1kg mud cake and double solvents is got, be 1:8 hybrid extraction 30min in mass ratio, extraction temperature is 30 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 150 DEG C in temperature, pressure is 50KPa(absolute pressure) under evaporate 25min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:100 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 95.2%.Although the rate of recovery of the petroleum substance in this process in oily sludge slightly improves, but drying process needs to consume a certain amount of saturation steam, water a large amount of in evaporation oily sludge, add equipment (desiccation machine) investment, meanwhile, in oily sludge drying process, the tail gas of also production some amount needs process further.

Comparative example 6:

Other processing condition are all identical with embodiment 4, and difference changes the form of oily sludge dehydration, adopts press dewatering here.Be 78% by water ratio, oil length is the oily sludge of 7%, send into oily sludge press dewatering equipment, it is 25 DEG C in temperature, pressure is 8Mpa, under dewatering time 20 minutes conditions, the water ratio generating mud cake is 38%, oil-containing 27%, then 1kg mud cake and double solvents is got, be 1:8 hybrid extraction 30min in mass ratio, extraction temperature is 30 DEG C, after end to be extracted, solidliquid mixture is sent into centrifuge separator, isolated liquid phase directly carries out freshening, isolated solid phase enters paddle formula desiccation machine, it is 150 DEG C in temperature, pressure is 50KPa(absolute pressure) under evaporate 25min after obtain solid slag, the fuel making coal firing boiler after this waste residue and bunker coal in mass ratio 1:100 blending is used.Petroleum substance in this process oily sludge is after extraction, and the rate of recovery is 93.9%.Press dewatering is adopted to oily sludge, adds facility investment, too increase device power consumption simultaneously.

Claims (5)

1. a treatment process for oily sludge, comprises the steps:
First oily sludge is sent into greenhouse mummification room mummification 6 ~ 20 days, then the mud cake generated after mummification is mixed with extraction agent, extraction agent is (30 ~ 1) with the mixing quality ratio of mud cake: 1, stir and extract, after extraction terminates, mixture is sent into solid-liquid separator, isolated liquid directly carries out freshening, and the solid residue after separation is direct and bunker coal blending after super-dry, makes fuel and uses;
It is characterized in that extraction agent used is made up of host A, secondary agent B and auxiliary agent C, wherein host A to be boiling range the be distillate of 110 ~ 135 DEG C, content is 85 ~ 100% (v/v); Secondary agent B to be boiling range the be distillate of 140 ~ 150 DEG C, content is 0 ~ 15% (v/v); Auxiliary agent C to be boiling range the be distillate of 80 ~ 100 DEG C, content is 0 ~ 5% (v/v).
2. treatment process as claimed in claim 1, is characterized in that extraction agent and mud cake mix at 0 ~ 50 DEG C and extracts.
3. treatment process as claimed in claim 1, is characterized in that the sunny slope of mud and opaco overturn at interval of 0.5 ~ 1.5 day by described oily sludge in drying process.
4. treatment process as claimed in claim 1, it is characterized in that the isolated solid phase of described solid-liquid separator enters drying plant, is 110 ~ 188 DEG C in temperature, and pressure is dry 5 ~ 100min under 20 ~ 100KPa.
5. the treatment process of the oily sludge as described in one of claim 1 ~ 4, comprises the steps:
(1) oily sludge is sent into mummification room, greenhouse, dewater under the radiation of sun power, drying time is 6 ~ 20 days, in drying process, the sunny slope of mud and opaco overturn by interval for 0.5 ~ 1.5 day, make mummification room keep good ventilation simultaneously, the water ratio of the mud cake generated drops to 15% ~ 40%, and the waste water produced in evaporative process sends into wastewater treatment equipment, discharges after process up to standard;
(2) mud cake formed in step (1) mixes with extraction agent at 0 ~ 50 DEG C, stirs 10 ~ 80min, and extraction agent is (30 ~ 1) with the mixing quality ratio of mud cake: 1;
(3) solidliquid mixture after extraction in step (2) is sent into solid-liquid separator, isolated liquid phase directly carries out freshening;
(4) in step (3), the isolated solid phase of solid-liquid separator enters drying plant, it is 110 ~ 188 DEG C in temperature, pressure is that the solid residue under 20 ~ 100KPa after dry 5 ~ 100min mixes with bunker coal, and blending ratio is 1 ︰ (20 ~ 1000), makes fuel and uses.
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CN105565621B (en) * 2016-01-27 2017-11-21 中国海洋石油总公司 A kind of washing oil method of viscoplasticity oily sludge
CN105621833A (en) * 2016-03-23 2016-06-01 武汉纺织大学 Method for recovering crude oil in petroleum oil sludge and comprehensively recycling residual mud and sand
CN107572751A (en) * 2016-07-05 2018-01-12 中国石油化工股份有限公司 The method for handling greasy filth
CN106915891A (en) * 2017-05-14 2017-07-04 郭舒洋 A kind of oil plant oily sludge is innoxious and processing method of resource

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