CN110550846A - Oily sludge harmless treatment process and equipment - Google Patents

Oily sludge harmless treatment process and equipment Download PDF

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Publication number
CN110550846A
CN110550846A CN201910882303.3A CN201910882303A CN110550846A CN 110550846 A CN110550846 A CN 110550846A CN 201910882303 A CN201910882303 A CN 201910882303A CN 110550846 A CN110550846 A CN 110550846A
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China
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oil
sludge
furnace
oily sludge
gas
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CN201910882303.3A
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吕靖芸
毕卉
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Ji Yucao
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Ji Yucao
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/13Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING 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
    • C10G1/00Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
    • CCHEMISTRY; METALLURGY
    • C10PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10GCRACKING 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
    • C10G1/00Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal
    • C10G1/002Production of liquid hydrocarbon mixtures from oil-shale, oil-sand, or non-melting solid carbonaceous or similar materials, e.g. wood, coal in combination with oil conversion- or refining processes

Abstract

The invention discloses a harmless treatment process and equipment for oily sludge, belonging to the field of oily sludge treatment. In the process of treating the oily sludge, three sections of waste heat are fully utilized: the oil sludge pool is heated by using the latent heat of steam generated by mixed gas during dehydration, the dehydration furnace is heated by using the residual heat brought out by the silt residue obtained after liquid-phase catalytic cracking, and the dehydration furnace is heated by using the residual heat of flue gas of the dehydration furnace. Meanwhile, sewage obtained after the oily sludge is treated by the equipment is purified and then is stored in a cooling tower, and cooling water in the cooling tower cools a condensing cooler and a pump in a vacuum pumping system. The invention provides a feasible and low-energy-consumption and low-cost oily sludge treatment process and equipment, which are used for performing harmless treatment on oily sludge, so that the oil content in silt residues reaches the level of 500-3000mg/kg, and the pollutant concentration index, the hygiene index and the physical and chemical index can meet the limit requirements of the national control standard of agricultural sludge pollutants.

Description

oily sludge harmless treatment process and equipment
Technical Field
The invention relates to the field of oily sludge treatment, in particular to an oily sludge harmless treatment process and equipment.
Background
Recently, petroleum is becoming one of the main energy sources in the fields of production, life, industry, agriculture, national defense and the like. Taking our country as an example, the daily consumption of crude oil in 2016 years in China reaches 100 hundred million barrels, and is increased year by year. In recent years, the increasing demand for petroleum in various countries of the world has stimulated the continuous development of the petrochemical industry. A large amount of oily sludge which has great harm to the environment is generated in the processes of petroleum exploitation, transportation, chemical engineering and oily sewage treatment, so that the oily sludge becomes a common problem which is urgently needed to be solved by various petroleum production and consumption countries.
The composition of the oily sludge is relatively complex, which mainly comprises 1 rock particles generated in the drilling process, 2 petroleum hydrocarbons (10 percent ~ 50 percent) and water (40 percent ~ 90 percent), soil and oil extraction additives, and 3 sulfides, benzene series, phenols and the like contained in the petroleum, wherein the oily sludge generated in each large oil field in China is about 10 million tons each year only by taking the petroleum exploitation in China as an example, and if the oily sludge with large quantity is not treated, the soil, underground water resources and the atmosphere are seriously polluted.
In recent 20 years, in order to effectively treat the oily sludge, researchers at home and abroad carry out a great deal of research work and develop various treatment methods aiming at the oily sludge. The conventional treatment methods are classified into biological methods and non-biological methods, and the methods are briefly described below.
The biological method comprises the following steps:
1. Biological field cultivation method
the biological field tillage method mainly landfills oily sludge and naturally degrades hydrocarbon pollutants by utilizing microorganisms in soil to convert the hydrocarbon pollutants into harmless soil components. Guangmue et al used a biological field tillage method to treat oily sludge containing 9.0% and 10.2% of oil, and the mass fraction of oily pollutants was reduced to 3.1% and 4.0% after 120 days, and the oil degradation rate reached 65.6% and 60.8% [ Guanyuming, Zhang faithful, Zhang Weimu, etc.. research on degradation of oily sludge by biological field tillage method, college and schools of petrochemical industry, 2010 ].
2. Bioaugmentation method
The biological enhancement method aims at putting microorganisms capable of efficiently decomposing petroleum hydrocarbons into oily Sludge to degrade hydrocarbon pollutants, foreign scholars, Lego and the like research the characteristics of various strains, and 4 of the strains are combined into Microbial agents which are put into the oily Sludge [ Gallego J L R, Maria Jes Garcia-Mart I nez, Juan F. Llamas, et al. biodegration of Oil Tank Bottom bed slurry Microbial consortia. biodegration, 2007, 18(3):269-81 ], the degradation efficiency of the paraffinic, naphthenic and aromatic compounds and sulfides thereof is 44%, 85% and 31% 3555%, respectively.
3. Biological flotation process
the domestic scholars are in great peace of mind and propose a biological flotation method for recycling most of oil in oily sludge by utilizing the biological flotation characteristics of gas production and surface tension change of microorganisms. Under the best experimental conditions, the degradation rate of oil-containing pollutants can reach more than 95 percent [ Li Da Ping, He Xiao hong, Tian Chong Min, etc.. biological flotation method for treating oil-containing sludge, environmental engineering, 2006, 24(1):58-60 ].
Non-biological method:
1. High temperature steam process
the principle of the technology lies in that light hydrocarbons and water in the oil-containing sludge are gasified by using ultrahigh-temperature steam at the temperature of more than 600 ℃, the heavy hydrocarbons are cracked and gasified, and then are uniformly collected and processed. The treated solid residue has a mass fraction of below 1%, and the minimum content can reach 0.08% [ in the case of red jade, Lixianhua, Duqingzhan, technology for treating oily sludge with super-hot steam, scientific and technological wind, 2011(11):10-10 ].
2. Solvent extraction process
the solvent extraction method is proposed by Zhao Rui Yu, a domestic scholar, and the organic phase is decompressed and distilled to separate the extractant and recover the crude oil after the oily sludge is extracted. The oil-containing pollutant recovery rate is 32% by adopting LPGC solvent to carry out fractionation at 200 ℃, and the recovery rate is 39% by adopting MEK solvent [ Zhao Rui Yu, Du Wen Jun, Yangyuan, and the like.
3. Tempering-centrifugal separation method
the treatment method comprises two steps, namely, firstly carrying out chemical conditioning on the oily sludge, and then centrifuging through a two-phase centrifugal separator to separate oily pollutants. The principle of the conditioning-centrifugation method is to deposit the heavier solid phase (rock particles) on the inner wall of the drum by centrifugal motion, while the lighter liquid phase (oil and moisture) is concentrated in the inner ring to separate the liquid layer.
4. wet oxidation process
The wet oxidation method utilizes an oxidant to oxidize organic matters in the oily sludge under a high-temperature and high-pressure environment to generate carbon dioxide and water, so that oil pollutants are removed. Bonity et al studied the catalytic action of soluble metal salts as catalysts on the oxidation of oil contaminants in an environment of temperature and oxygen partial pressure [ Bernardi M, Cretentt D, St. phaseDeleris, et al, Performance of soluble metallic salts in the catalytic reaction of the catalytic microorganism, 2010, 157(1-4):420-424 ].
5. Two-stage treatment method of thermal desorption and catalytic pyrolysis
liu Jian nations and the like invented a thermal desorption and catalytic pyrolysis two-stage treatment method for oily sludge, the oily sludge is subjected to thermal desorption treatment by utilizing the method to obtain oil components, and then the oil components are subjected to catalytic pyrolysis to recover oil and combustible gas, so that the recovery rate is higher [ Liu Jian nations, Xushahua, Zhang Shi, and the like ].
6. air float method
the air floatation method is also called as air floatation three-phase separation method, and refers to that the hot alkaline water washing pretreatment is carried out on the oil-containing sludge, then the air floatation method is carried out to separate the oil-containing pollutants, and the deoiling rate can reach 94.3 percent [ Li Mei Rong, Sun east, Yuan Guang, deep processing technology for recovering crude oil from the oil sludge at the bottom of a high oil-containing tank, colleges and universities in petrochemical industry, 2006, 19(2):30-33 ].
The prior treatment method for oily sludge focuses on two directions of biological method and non-biological method, and the known methods have the problem of restricting the wide application thereof. Compared with a non-biological method, the biological method has the problems that the research and development period of microbial strains is long, the research and development cost is high, a single strain is difficult to effectively treat oily sludge with various components, the environment condition required in the treatment process is harsh, the treatment process is long, the occupied area is large, the environment is still harmed in the treatment process, and the like. The non-biological method also has the defects of expensive reaction catalyst, easy poisoning, complex treatment process, high energy consumption, high cost and the like, so that the non-biological method cannot be popularized and used for solving the problem of oily sludge pollution commonly existing in the petrochemical industry.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide a feasible treatment process and equipment for oily sludge, which are used for carrying out harmless treatment on the oily sludge, so that the oil content in silt residues reaches the level of 500-3000mg/kg (namely the oil content is less than 3 per thousand), and the pollutant concentration index, the hygiene index and the physical and chemical index can meet the limit requirements of the national control standard of agricultural sludge pollutants (the control standard of agricultural sludge pollutants GB 4284-2018).
The purpose of the invention is realized by at least one of the following technical solutions.
An oily sludge innocent treatment device comprises an oily sludge pretreatment device, an oily sludge demulsification dehydration device, an oily sludge deoiling device and an oily sludge catalytic cracking device which are sequentially connected;
The device also comprises a sewage recovery, purification and cyclic utilization device, an oil recovery device and a non-condensable gas recovery, storage and utilization device; the sewage recovery, purification and cyclic utilization device is connected with the oily sludge demulsification and dehydration device, and the oil recovery device is connected with the oily sludge demulsification and dehydration device, the oily sludge deoiling device and the oily sludge catalytic cracking device; the noncondensable gas recycling, storing and utilizing device is connected with the oily sludge demulsification and dehydration device and the oily sludge catalytic cracking device;
the oily sludge pretreatment device comprises an oily sludge pool, a heating coil and an impurity removal facility, wherein the heating coil is arranged at the bottom of the oily sludge pool;
The oil-containing sludge demulsification dehydration device comprises an oil sludge feeding bin, at least one dehydration furnace connected with the oil sludge feeding bin, and an oil sludge water separator connected with one end of the dehydration furnace; the dehydration furnace is provided with an inner layer and an outer layer, and comprises an inner layer pipeline for conveying oily sludge to be dehydrated and an outer layer pipeline for conveying heat; the oil sludge feeding bin is connected with one end of the oil sludge pool through a first screw conveyor; one end of a heating coil at the bottom of the oil sludge pool is connected with the top of the oil sludge-water separator, and the other end of the heating coil is connected with an oil recovery device;
the deoiling device for the oil-containing sludge comprises a deoiling furnace, an oil-sludge gas separator arranged at one end of the deoiling furnace, a dust remover connected with the top end of the oil-sludge gas separator and a slag receiving pool positioned at the bottom of the oil-sludge gas separator; the deoiling furnace is provided with an inner layer and an outer layer and comprises an inner layer pipeline for conveying sludge to be deoiled and a heating layer for conveying heat; the oil removing furnace is connected with the bottom of the oil sludge water separator through a second screw conveyor; the slag receiving tank is connected with an outer layer pipeline of the dewatering furnace through a third screw conveyor; and the heating layer of the deoiling furnace is connected with an outer layer pipeline of the dewatering furnace.
Further, the oil recovery device comprises a primary recovery device and a secondary recovery device, wherein the primary recovery device comprises a condensation cooler connected with the heating coil at the bottom of the sludge pool, an oil-water separator connected with the condensation cooler, a light oil pump connected with the oil-water separator, a light oil storage tank connected with the light oil pump, and a fuel oil tank connected with the light oil storage tank through an oil reversing pump; the fuel oil tank is connected with an outer pipeline of the dehydration furnace and a heating layer of the deoiling furnace;
The secondary recovery device comprises a vacuumizing system connected with the top of the oily sludge catalytic cracking device, an oil storage tank connected with an oil pump inside the vacuumizing system, a heavy oil pump connected with the oil storage tank, a heavy oil tank connected with the heavy oil pump, an oil storage tank connected with the bottom of the dust remover and an oil circulating pump connected with an outlet of the oil storage tank; the oil circulating pump is connected with the upper part of the dust remover; the heavier oil tank is connected with the fuel oil tank.
in order to save the whole space of equipment, improve the treatment efficiency of oil sludge of the equipment, ensure the qualified quality of the treated silt and completely recycle petroleum hydrocarbons.
Further, the sewage recovery, purification and cyclic utilization device comprises a sewage pump connected with the bottom of the oil-water separator, a sewage treatment system connected with the sewage pump, a clean water pump connected with the sewage treatment system and a water cooling tower connected with the clean water pump; the water cooling tower is connected with a condensing cooler needing cooling and a water pipeline in the vacuum pumping system through a cooling circulation pipeline; the condensation cooler also receives cooling water from the sewage recovery, purification and circulation device; the vacuum-pumping system also receives cooling water obtained by treatment from the sewage recovery, purification and circulation device.
Further, the non-condensable gas recycling, storing and utilizing device comprises a gas storage tank and a Roots blower arranged on one side of the gas storage tank; the gas storage tank is connected with the oil-water separator and the vacuum pumping system; one side of the Roots blower is connected with the fire nozzles of the deoiling furnace and the dewatering furnace.
Further, the oil-containing sludge catalytic cracking device comprises two catalytic cracking tanks which are arranged side by side, and a gas-phase catalyst is arranged in each catalytic cracking tank; and a liquid phase catalyst is arranged in the deoiling furnace. The harmless treatment process of the oily sludge relates to two-stage catalytic cracking, wherein a first-stage catalytic cracking catalyst uses a liquid-phase catalyst and is generated in a deoiling furnace, a second-stage catalytic cracking catalyst uses a gas-phase catalyst and is generated in a catalytic cracking tank, and the two-stage catalytic cracking reaction can ensure that crude oil resources in the oily sludge can be fully recycled.
furthermore, the deoiling furnace adopts a two-section propulsion heating structure, wherein one end of the first section of propulsion heating structure is connected with the second screw conveyor, the top of the other end of the first section of propulsion heating structure is connected with the oil-gas separation section of the oil-sludge separator, and the bottom of the other end of the first section of propulsion heating structure is connected with one end of the second section of propulsion heating structure; the upper part of the other end of the second section of the propulsion heating structure is connected with an oil-gas separation section of the oil-sludge gas separator, and the bottom of the second section of the propulsion heating structure is connected with a residual oil-sand separation section of the oil-sludge gas separator; the bottom of the oil sludge separator residual oil sand separation section is connected with a slag receiving pool.
Further, pall rings are arranged at the inlets of the dehydration furnace and the deoiling furnace.
Furthermore, the spiral conveying mechanisms are arranged inside the dehydration furnace and the deoiling furnace, so that the oily sludge can be pushed to move forwards and backwards, the oily sludge is ensured not to be retained at a certain point of the heating equipment in the operation, and the problem of overheating and coking of the oily sludge in the heating furnace is effectively solved.
further, one side of the oil sludge pool conveys the pretreated oily sludge to an oil sludge feeding bin of the oily sludge demulsification and dehydration device through a first spiral conveying mechanism.
Furthermore, the dehydration furnaces comprise a first dehydration furnace taking heating furnace flue gas as a heat source and a second dehydration furnace taking sandy soil residual oil waste heat as a heat source, the two dehydration furnaces can perform dehydration treatment on oil-containing sludge and completely use the waste heat for heating so as to achieve the effect of reducing the energy consumption of the whole equipment, the heating layer of the deoiling furnace is connected with the first dehydration furnace taking the heating furnace flue gas as the heat source, and the top end of the third spiral conveying mechanism is connected with the second dehydration furnace taking high-temperature sludge sand as the heat source. Because the two heat sources provide different heat, the oil-containing sludge entering the two dehydration furnaces has different amounts, and the oil-containing sludge entering amount of the dehydration furnace supplied by the heat source with large heat is larger than that of the dehydration furnace supplied by the heat source with small heat, so as to obtain the same dehydration rate of the oil sludge; the two dehydration furnaces control the amount of the oil sludge through a rotary valve (driven by a variable frequency motor) so as to ensure that the two dehydration furnaces can completely carry out demulsification dehydration treatment on the oil-containing sludge or ensure that the dehydration rates of the oil-containing sludge after the two dehydration furnaces are treated are the same. Because the oily sludge dehydration process requires that the heating temperature of the oily sludge reaches 100-110 ℃, when the dehydration furnace can not heat the oily sludge to the temperature, the oily sludge needs to be heated by burning the fuel oil or the non-condensable gas obtained by the process, and the temperature of the oily sludge is kept between 95 and 110 ℃ to achieve the purpose of complete dehydration; after start-up, the heat should be supplied by the outsourced fuel for the first eight hours of operation.
Furthermore, the vacuum pumping system reduces the air pressure in the deoiling furnace to 600mm mercury column level, so that oil in the deoiling furnace can be conveniently analyzed and gasified, heavy oil gas and non-condensable gas mixed gas generated by secondary catalytic cracking is received, and the oil with higher liquefaction temperature is liquefied by cooling with condensed water and enters an oil storage tank.
furthermore, a pall ring is arranged at the inlet of the deoiling furnace, a screw conveying mechanism is arranged in the deoiling furnace to fully stir the oil-containing sludge, so that the dispersity of the oil-containing sludge is improved, the contact area between the oil-containing sludge and a liquid-phase catalyst is increased, and the heavy oil difficult to gasify in the oil-containing sludge is ensured to be fully cracked, thereby achieving higher deoiling rate
Furthermore, in order to ensure that the solid silt generated after the oil-containing sludge is subjected to harmless treatment meets the national set standard, the oil-containing sludge harmless treatment equipment is provided with a sampler on a light oil recovery device, a heavy oil recovery device, a sewage treatment system, a slag receiving tank and the like, so that the quality of products is tested and analyzed at any time, and once unqualified products are generated, the unqualified products are returned to a proper process section for retreatment in time except for immediately adjusting process conditions, so that the treated residues are all qualified.
furthermore, in order to reduce the micro dust carried in the gas generated in the oil-containing sludge dewatering and deoiling process and not influence the next process, a Bohr ring filler with a certain thickness and a gas filter screen are arranged at a certain distance above the oil-sludge-water separator and the oil-sludge-gas separator. When the gas passes through the filler and the filter screen, a certain amount of dust can be blocked.
The process for treating the oily sludge by using the oily sludge harmless treatment equipment comprises the following steps:
(1) Placing the oily sludge in an oily sludge pool for heating pretreatment;
(2) conveying the oil-containing sludge subjected to heating pretreatment to a dehydration furnace for heating dehydration, cooling the mixed gas obtained after heating dehydration by a condensing cooler, and separating to obtain light oil, sewage and non-condensable gas;
(3) Conveying the heated and dehydrated oily sludge to a deoiling furnace for liquid-phase catalytic cracking reaction;
(4) Dedusting mixed gas obtained by liquid-phase catalytic cracking reaction, conveying the mixed gas into a catalytic cracking tank for gas-phase catalytic cracking reaction, and cooling and separating the obtained mixed gas by a vacuum pumping system to obtain heavier oil and non-condensable gas;
In the step (1), a sludge pool is heated by using the latent heat of steam generated by mixed gas during dehydration;
In the step (2), the dehydration furnace is heated by utilizing the waste heat brought out by the silt residue obtained after liquid-phase catalytic cracking, and the dehydration furnace is heated by utilizing the flue gas waste heat of the dehydration furnace;
Purifying the sewage obtained in the step (2) and storing the sewage in a cooling tower, cooling the pump in the condensation cooler and the vacuum pumping system by cooling water in the cooling tower, and discharging the sewage when the sewage is excessive;
storing the light oil obtained in the step (2) in a light oil storage tank, and finally selling or entering a fuel oil tank for storage and serving as fuel of a dehydration furnace and a deoiling furnace;
the non-condensable gas obtained in the step (2) and the step (4) enters a gas storage tank through a corresponding pipeline and then is led to a fire nozzle of a dehydration furnace or a deoiling furnace to be used as fuel for combustion;
And (4) storing the heavier oil obtained in the step (4) in a heavier oil tank, and using the heavier oil as an adsorbent in the dust removal of the mixed gas to remove the fine dust in the mixed gas obtained by the liquid phase catalytic cracking reaction or as fuel for a heating dehydration furnace or a deoiling furnace.
Further, the demulsifier is added into the oily sludge to be treated in the step (1), so that the separation of water and oil in the oily sludge can be ensured before dehydration and deoiling, and an emulsion which is difficult to treat is formed. Meanwhile, the high temperature of the deoiling furnace can also generate the demulsification effect. Therefore, most of the oil in the oily sludge can be removed at the time of deoiling.
and (3) in the dust removal process in the step (4), a mixed gas inlet of the dust remover is positioned 8 ~ 12cm below the liquid level of heavy oil in the dust remover, mixed oil gas and carried fine dust enter the dust remover from an inlet positioned 8 ~ 12cm below the liquid level of an adsorbent and are fully contacted with the adsorbent, the fine dust in the gas phase is adsorbed by the adsorbent, so that the effects of removing gas-phase fine dust, purifying oil gas and preventing the pollution failure of the catalyst and blocking pipelines and equipment are achieved, the oil storage tank 27 is matched with the oil circulating pump 28 to control the liquid level of the adsorbent in the dust remover to be constant, namely when the liquid level of the adsorbent in the dust remover is lowered, the oil circulating pump pumps the adsorbent in the oil storage tank into the dust remover to supplement the adsorbent, when the liquid level of the adsorbent in the dust remover is too high, the adsorbent automatically flows into the oil storage tank, the liquid level of the adsorbent is lowered, the liquid level is automatically controlled by a liquid level meter, when the amount of the fine dust absorbed by the adsorbent is saturated, the adsorbent can be conveyed into an external sludge storage tank to be treated by a heat source, the catalytic cracking furnace, the sludge is treated by a second-temperature cracking furnace, and the sludge is prepared by a second heat source, and is dehydrated.
The technological process is mainly to utilize ZSM-5 molecular sieve liquid phase catalyst and molybdenum-nickel ultrastable Y-type molecular sieve gas phase catalyst to crack high molecular hydrocarbon in the oil sludge into medium and small molecular hydrocarbon so as to recover petroleum resources. For oil sludge with different properties and states, different catalysts are used, so-called gas phase cracking, which is a two-stage catalytic cracking process, can be performed on oil sludge with a low dry basis and oil content, and a liquid phase catalyst is used together with oil sludge with a high oil content. Therefore, the problem that pipelines and equipment are blocked is solved, and the recovered oil is clear and transparent.
Furthermore, high-temperature oil gas carried dust in the deoiling furnace can be adhered to the inner wall of the processing equipment, so that the operation efficiency of the equipment is directly influenced; meanwhile, in the catalytic cracking process, the silt and dust can also cause catalyst poisoning, so that the activity of the catalyst is greatly influenced. In order to solve the problem of dust carried by high-temperature oil gas, the heavier oil generated by the process is used as an adsorbent in the dust removal process, and the adsorbent can be recycled and has low price.
Further, the heating pretreatment temperature is 30 ~ 50 ℃, the heating dehydration temperature in the dehydration furnace is 95-110 ℃, and the liquid phase catalytic cracking reaction temperature is 310-390 ℃.
Furthermore, the harmless treatment process of the oily sludge can be used for treating the oily sludge containing waste plastics together, only waste engine oil accounting for 30% of the volume of the oily sludge is added when the oily sludge enters a deoiling stage, and the subsequent processes are the same.
The innocent treatment process adopts a suitable treatment process and processing equipment, and can automatically adjust process parameters or equipment according to the components and properties of the oily sludge to carry out innocent treatment on the oily sludge. For example, the process adopted for oily sludge with low oil content and high water content is a method of dewatering firstly and then removing oil, and dewatering is mainly adopted. For the oily sludge with large oil content and little water content, after rough dehydration, the oil hydrocarbon is completely removed and recycled by the next kukoff. The solidified oily sludge dug out after the stacking time is relatively long or the oily sludge is deeply buried is a treatment process, namely, the oily sludge is required to be crushed and added with water accounting for 25 percent of the mass of the oily sludge to be fully stirred in the pretreatment process, and the process is the same in other aspects. The oil sludge wrapped by plastic needs to be added with waste engine oil accounting for 30 percent of the volume of the oil sludge as a solvent when the oil sludge enters a deoiling procedure. The oily sludge with various sundries such as domestic garbage, construction garbage, weeds and the like piled on the surface layer of the oily sludge is also provided with a set of complete treatment process and equipment, namely, the oily sludge needs to be crushed and preliminarily filtered besides being heated in the pretreatment procedure.
Meanwhile, the advanced processing technology, the processing equipment with certain characteristics and the special catalyst are matched, so that the normal alkane, the isoparaffin, the olefin, the dialkene, the cycloolefin, the cycloalkane, the aromatic hydrocarbon, the cyclic aromatic hydrocarbon and the polycyclic aromatic hydrocarbon of the oily sludge can be well recovered. The mixed oil recovered from the oil sludge is clear and transparent, can be used as fuel oil of the processing device, and is a high-quality raw material of a crude oil deep processing device. After the oily sludge is processed, the liquid phase yield is high, and the oil content in the residual residue can reach less than 3 per mill.
when the device works, oily sludge in the oil sludge pool is preheated under the action of the heating coil at the bottom of the oil sludge pool, and enters an oil sludge feeding bin through a first spiral conveying mechanism after being preheated; the bottom of the oil sludge feeding bin is provided with two rotary valves controlled by variable frequency motors, and the valves are respectively connected with two first dehydration furnaces and two second dehydration furnaces; the dehydration furnace is respectively provided with heat by the flue gas of the heating furnace and the high-temperature silt, and the oily sludge is heated in the dehydration furnace to evaporate water; if the oily sludge is not heated to the complete dehydration temperature of 95-110 ℃ in the two dehydration furnaces, the oily sludge needs to be further heated by burning the fuel oil or non-combustible gas obtained by the process so as to be completely dehydrated, and then the oily sludge is conveyed to an oil-sludge-water separator by a spiral conveying mechanism in the dehydration furnaces; after the oil-containing sludge reaches the oil-sludge-water separator, the mixed gas of light oil gas, noncondensable gas and steam enters a heating coil at the bottom of an oil-sludge pool through the upper part of the oil-sludge-water separator, then enters a condensation cooler, the cooled small-molecular light oil and water are liquefied and enter an oil-water separator together with the noncondensable gas, on one hand, the noncondensable gas directly enters a gas storage tank through a pipeline at the top of the oil-water separator to be stored, and is finally blown into a fire nozzle by a Roots blower to provide heat as fuel, on the other hand, the light oil and the water are separated by natural layering, the light oil enters a fuel oil tank to be stored and sold or combusted to provide heat for equipment;
the sludge in the oil-sludge-water separator enters a deoiling furnace through a second spiral conveying mechanism, is subjected to primary catalytic cracking at the temperature of 310-plus 390 ℃ through liquid-phase catalyst catalysis, high-molecular hydrocarbon substances in the sludge are subjected to cracking reaction to generate heavier oil gas and non-condensable gas, and then enter a heavier oil-gas separation section of an oil-gas separator, on one hand, the heavier oil gas and the non-condensable gas enter a catalytic cracking tank, are further subjected to secondary catalytic cracking through gas-phase catalyst catalysis, enter a vacuumizing system to realize separation of the non-condensable gas and the heavier oil, the non-condensable gas enters a non-condensable gas recovery storage and utilization device, is purified and then used for storage or combustion heating, the heavier oil enters a recovery oil tank, and on the other hand, the deoiled high-temperature silt is conveyed to a second spiral conveying structure by a dewatering furnace taking high-temperature sandy soil as a heat source; meanwhile, the deoiling furnace takes fuel oil obtained by equipment treatment as fuel, and flue gas generated by combustion is collected and then sent to the outer layer of the first dehydrating furnace to be used as a heat source to heat and dehydrate the oily sludge.
the dust remover is internally provided with a certain amount of adsorbent, the adsorbent circulates through a circulating pipeline, heavy oil gas from a heavy oil-gas separation section of an oil-sludge gas separator and dust carried by the gas contact with the circulating adsorbent, the carried dust is adsorbed and removed by the adsorbent, the oil gas enters a cracking catalytic tank after being purified, is further cracked under the action of a gas-phase catalyst and enters a vacuum pumping system together with non-condensable gas, the heavy oil is liquefied and separated from the non-condensable gas along with the reduction of pressure intensity in the vacuum pumping system, the non-condensable gas enters a gas storage tank for storage, and is finally blown into a fire nozzle by a Roots blower to provide heat as fuel, and the heavy oil enters an oil tank for storage;
after water in the oily sludge is heated and evaporated by a dehydration furnace, the water passes through a condensing cooler and is finally separated from light oil and non-condensable gas in an oil-water separator, the water firstly enters a sewage treatment system, is subjected to purification treatment and then enters a water cooling tower to be cooled and then flows into the bottom for storage, and the water can be discharged when the water amount reaches the upper limit; and the cooling water stored at the bottom of the cooling water tower circulates through a pipeline and cools a condensation cooler and a vacuum-pumping system of the oily sludge harmless treatment equipment respectively.
Compared with the prior art, the invention has the following advantages:
1. In order to reduce the energy consumption of the oil-containing sludge treatment equipment, three sections of waste heat in the equipment are fully utilized: firstly, the waste heat of flue gas; secondly, the residual heat brought out by the silt residues; thirdly, the latent heat of steam generated during dehydration. When the crude oil resources in the oily sludge are rich, the process can utilize the crude oil resources obtained by the oily sludge treatment to carry out harmless treatment on the oily sludge without external fuel, and can also produce a certain amount of fuel oil and gas resources for sale when self-sufficiency of fuel is met, so that the energy consumption and the cost required by the oily sludge treatment are greatly reduced.
2. The invention adopts advanced processing technology, processing equipment with certain characteristics and the cooperation of a special catalyst, so that the normal alkane, the isoparaffin, the olefin, the dialkene, the cycloolefin, the cycloparaffin, the aromatic hydrocarbon, the cyclic aromatic hydrocarbon and the polycyclic aromatic hydrocarbon of the oily sludge can be well recovered. The mixed oil recovered from the oil sludge is clear and transparent, can be used as fuel oil of the processing device, and is a high-quality raw material of a crude oil deep processing device. After the oily sludge is processed, the liquid phase yield is high, and the oil content in the residual residue can reach less than 3 per mill. Other indicators are as follows: the pollutant concentration index, the hygiene index and the physicochemical index of the sludge product can meet the requirements of national standard (GB 4284-2018) and are far higher than the existing oily sludge treatment process level.
3. the sewage generated by the process for treating the oily sludge can meet the requirement of the water inlet quality standard of an oil field sewage treatment plant after being properly treated, and can be discharged after reaching the standard after being deeply treated by the sewage treatment plant, or a sewage treatment system is arranged, the treated sewage can be recycled, and the redundant part of the treated sewage can be discharged after reaching the standard. After catalytic cracking, petroleum hydrocarbons in the water-containing sludge generate a small amount of combustible noncondensable gas (about 10% of the total hydrocarbons). The non-condensable gas can be used as fuel gas of the oil sludge treatment device after being refined, and the combustion tail gas does not pollute the atmosphere.
4. The invention has a set of complete treatment process and equipment for the solidified oily sludge dug out by long stacking time or deep burying, and the oily sludge with various impurities such as domestic garbage, construction waste, weeds and the like stacked on the surface layer of the oily sludge, namely, the oily sludge is required to be crushed and primarily filtered besides being heated in the pretreatment procedure, thereby simplifying the treatment process of the oily sludge, improving the harmless treatment efficiency of the oily sludge and saving precious manpower and material resources.
5. The oily sludge treatment device has the advantages of reasonable and compact overall design, higher automatic control process and comprehensive safety precaution consideration. The device can realize long-period uninterrupted continuous production, and the whole oil sludge treatment device is of a skid-mounted structure and is convenient to move and install. The equipment can be conveyed to an oil-containing sludge production place, and the oil-containing sludge is directly treated at an oil-containing sludge source, so that the time and the cost required by transferring and conveying the oil-containing sludge are saved.
Drawings
FIG. 1 is a schematic structural view of an oil-containing sludge innocent treatment apparatus according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the examples and the drawings, but the embodiments of the present invention are not limited thereto.
The structure schematic diagram of the oily sludge harmless treatment equipment is shown in figure 1, and comprises an oily sludge pretreatment device, an oily sludge demulsification dehydration device, an oily sludge deoiling device and an oily sludge catalytic cracking device which are sequentially connected;
The device also comprises a sewage recovery, purification and cyclic utilization device, an oil recovery device and a non-condensable gas recovery, storage and utilization device; the sewage recovery, purification and cyclic utilization device is connected with the oily sludge demulsification and dehydration device, and the oil recovery device is connected with the oily sludge demulsification and dehydration device, the oily sludge deoiling device and the oily sludge catalytic cracking device; the noncondensable gas recycling, storing and utilizing device is connected with the oily sludge demulsification and dehydration device and the oily sludge catalytic cracking device;
The oily sludge pretreatment device comprises an oily sludge pool 1, a heating coil and an impurity removal facility, wherein the heating coil is arranged at the bottom of the oily sludge pool;
The oil-containing sludge demulsification dehydration device comprises an oil sludge feeding bin 3, two dehydration furnaces 4 connected with the oil sludge feeding bin 3, and an oil sludge water separator 5 connected with one end of each dehydration furnace 4; the dehydration furnace is provided with an inner layer and an outer layer, and comprises an inner layer pipeline for conveying oily sludge to be dehydrated and an outer layer pipeline for conveying heat; the oil sludge feeding bin 3 is connected with one end of the oil sludge pool 1 through a first screw conveyor 2; one end of a heating coil at the bottom of the oil sludge pool 1 is connected with the top of the oil sludge-water separator 5, and the other end of the heating coil is connected with an oil recovery device;
The deoiling device for the oil-containing sludge comprises a deoiling furnace 7, an oil-sludge gas separator arranged at one end of the deoiling furnace 7, a dust remover 9 connected with the top end of the oil-sludge gas separator, and a slag receiving pool 10 positioned at the bottom of the oil-sludge gas separator; the deoiling furnace is provided with an inner layer and an outer layer and comprises an inner layer pipeline for conveying sludge to be deoiled and a heating layer for conveying heat; the deoiling furnace is connected with the bottom of the oil sludge-water separator 5 through a second screw conveyor 6; the slag receiving tank 10 is connected with an outer layer pipeline of the dehydration furnace 4 through a third screw conveyor 11; the heating layer of the deoiling furnace 7 is connected with the outer layer pipeline of the dewatering furnace 4.
Specifically, the oil recovery device comprises a primary recovery device and a secondary recovery device, wherein the primary recovery device comprises a condensation cooler 18 connected with a heating coil at the bottom of the sludge pool 1, an oil-water separator 19 connected with the condensation cooler 18, a light oil pump 24 connected with the oil-water separator 19, a light oil storage tank 25 connected with the light oil pump 24, and a fuel oil tank connected with the light oil storage tank 25 through a dump oil pump 26; the fuel oil tank is connected with an outer layer pipeline of the dehydration furnace 4 and a heating layer of the deoiling furnace 7;
the secondary recovery device comprises a vacuumizing system 13 connected with the top of the oily sludge catalytic cracking device, an oil storage tank 14 connected with an oil pump in the vacuumizing system 13, a heavy oil pump 15 connected with the oil storage tank 14, a heavy oil tank connected with the heavy oil pump 15, an oil storage tank 27 connected with the bottom of the dust remover 9, and an oil circulating pump 28 connected with an outlet of the oil storage tank 27; the oil circulating pump 28 is connected with the upper part of the dust remover 9; the heavier oil tank is connected with the fuel oil tank.
In order to save the whole space of equipment, improve the treatment efficiency of oil sludge of the equipment, ensure the qualified quality of the treated silt and completely recycle petroleum hydrocarbons.
Specifically, the sewage recovery, purification and recycling device comprises a sewage pump 20 connected with the bottom of the oil-water separator, a sewage treatment system 21 connected with the sewage pump 20, a clean water pump 22 connected with the sewage treatment system 21, and a water cooling tower 23 connected with the clean water pump 22; the water cooling tower 23 is connected with the condensing cooler 18 to be cooled and the water pipeline in the vacuum-pumping system 13 through a cooling circulating pipeline; the condensation cooler also receives cooling water from the sewage recovery, purification and circulation device; the vacuum-pumping system also receives cooling water obtained by treatment from the sewage recovery, purification and circulation device.
specifically, the non-condensable gas recycling, storing and utilizing device comprises a gas storage tank 16 and a Roots blower 17 arranged on one side of the gas storage tank 16; the gas storage tank 16 is connected with the oil-water separator 19 and the vacuumizing system 13; one side of the Roots blower 17 is connected with the fire nozzles of the deoiling furnace 7 and the dewatering furnace 4.
specifically, the oil-containing sludge catalytic cracking device comprises two catalytic cracking tanks 12 which are arranged side by side, and gas-phase catalysts are arranged in the catalytic cracking tanks; and a liquid phase catalyst is arranged in the deoiling furnace. The harmless treatment process of the oily sludge relates to two-stage catalytic cracking, wherein a first-stage catalytic cracking catalyst uses a liquid-phase catalyst and is generated in a deoiling furnace, a second-stage catalytic cracking catalyst uses a gas-phase catalyst and is generated in a catalytic cracking tank, and the two-stage catalytic cracking reaction can ensure that crude oil resources in the oily sludge can be fully recycled.
specifically, the deoiling furnace adopts a two-section propulsion heating structure, wherein one end of the first section of propulsion heating structure is connected with the second screw conveyor 6, the top of the other end of the first section of propulsion heating structure is connected with an oil-gas separation section of the oil-sludge separator by 8-1, and the bottom of the other end of the first section of propulsion heating structure is connected with one end of the second section of propulsion heating structure; the upper part of the other end of the second section of the propulsion heating structure is connected with an oil-gas separation section of the oil-sludge gas separator, and the bottom of the second section of the propulsion heating structure is connected with a residual oil-sand separation section 8-2 of the oil-sludge gas separator; the bottom of the oil sludge separator residual oil sand separation section is connected with a slag receiving pool 10.
specifically, pall rings are arranged at the inlets of the dehydration furnace and the deoiling furnace.
Specifically, the spiral conveying mechanisms are arranged in the dehydration furnace and the deoiling furnace, so that the oily sludge can be pushed to move forwards and backwards, the oily sludge is ensured not to be retained at a certain point of the heating equipment in the operation, and the problem of overheating and coking of the oily sludge in the heating furnace is effectively solved.
Specifically, one side of the oil sludge pool conveys the pretreated oily sludge to an oil sludge feeding bin of the oily sludge demulsification and dehydration device through a first spiral conveying mechanism.
Specifically, the dehydration furnaces comprise a first dehydration furnace taking heating furnace flue gas as a heat source and a second dehydration furnace taking sandy soil residual oil waste heat as a heat source, the two dehydration furnaces can perform dehydration treatment on oil-containing sludge and completely use the waste heat for heating so as to achieve the effect of reducing the energy consumption of the whole equipment, the deoiling furnace heating layer is connected with the first dehydration furnace taking the heating furnace flue gas as the heat source, and the top end of the third spiral conveying mechanism is connected with the second dehydration furnace taking high-temperature mud and sand as the heat source. Because the two heat sources provide different heat, the oil-containing sludge entering the two dehydration furnaces has different amounts, and the oil-containing sludge entering amount of the dehydration furnace supplied by the heat source with large heat is larger than that of the dehydration furnace supplied by the heat source with small heat, so as to obtain the same dehydration rate of the oil sludge; the two dehydration furnaces control the amount of the oil sludge through a rotary valve (driven by a variable frequency motor) so as to ensure that the two dehydration furnaces can completely carry out demulsification dehydration treatment on the oil-containing sludge or ensure that the dehydration rates of the oil-containing sludge after the two dehydration furnaces are treated are the same. Because the oily sludge dehydration process requires that the heating temperature of the oily sludge reaches 100-110 ℃, when the dehydration furnace can not heat the oily sludge to the temperature, the oily sludge needs to be heated by burning the fuel oil or the non-condensable gas obtained by the process, and the temperature of the oily sludge is kept between 95 and 110 ℃ to achieve the purpose of complete dehydration; after start-up, the heat should be supplied by the outsourced fuel for the first eight hours of operation.
Specifically, the vacuum pumping system reduces the air pressure in the deoiling furnace to 600mm mercury column level, so that oil in the deoiling furnace can be conveniently analyzed and gasified, heavy oil gas and non-condensable gas mixed gas generated by secondary catalytic cracking is received, and the oil with higher liquefaction temperature is liquefied by cooling with condensed water and enters an oil storage tank.
specifically, a pall ring is arranged at the inlet of the deoiling furnace, a spiral conveying mechanism is arranged in the deoiling furnace to fully stir the oil-containing sludge, so that the dispersity of the oil-containing sludge is improved, the contact area between the oil-containing sludge and a liquid-phase catalyst is increased, the heavy oil difficult to gasify in the oil-containing sludge is ensured to be fully cracked, and the higher deoiling rate is achieved
Specifically, in order to ensure that solid silt generated after the oil-containing sludge is subjected to harmless treatment meets the national set standard, the oil-containing sludge harmless treatment equipment is provided with a sampler on a light oil recovery device, a heavy oil recovery device, a sewage treatment system, a slag receiving tank and the like, so that the quality of products is tested and analyzed at any time, and once unqualified products are generated, the unqualified products are returned to a proper process section for retreatment in time except for immediately adjusting process conditions, so that the treated residues are all qualified.
Specifically, in order to reduce the micro-dust carried in the gas generated in the oil-containing sludge dewatering and deoiling process and not influence the next process, a pall ring filler and a gas filter screen with certain thickness are arranged at a certain distance above the oil-sludge-water separator and the oil-sludge-gas separator. When the gas passes through the filler and the filter screen, a certain amount of dust can be blocked.
Example 1-Small test for harmless treatment of oily sludge in harbor cabin
A process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
454g of oily sludge (containing 45.1% of oil, 38.5% of water and 16.4% of silt) in a certain harbor cabin is taken and placed in an oil sludge pool, the oily sludge is conveyed to a first dewatering furnace and a second dewatering furnace by a first screw conveyor after the step of heating pretreatment (the heating temperature is 50 ℃ and the heating time is 30 min) for heating dewatering (the heating temperature is 95 ℃ and the heating time is 30 min), and in the heating dewatering process, the oily sludge is pushed forward by the screw conveyor in the dewatering furnaces to enter an oil sludge water separator. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 385 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, the oily sludge contacts with a liquid-phase catalyst (ZSM-5 molecular sieve catalyst, round particles and 0.5mm in size) arranged at a proper position in the deoiling furnace in the forward pushing and heating process and generates a catalytic cracking reaction, and the residual oil in the oily sludge is cracked into heavier oil gas (the heavier oil gas is distinguished from the light oil gas obtained in the dehydration process) and non-condensable gas mixed gas. The mixed oil gas moves upwards in the deoiling furnace, and enters an oil-gas separation section of the oil-sludge-gas separator through an upper outlet and a pipeline into a dust remover. Heavy oil obtained by treating oily sludge by equipment is contained in a dust remover and used as an adsorbent, mixed gas of heavy oil gas and non-condensable gas generated by deoiling and catalytic cracking enters the dust remover at an inlet which is 10cm below a heavy oil page in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and the mixed gas is purified. The purified mixed gas of the heavy oil gas and the non-condensable gas enters the two catalytic cracking tanks through pipelines, so that the secondary catalytic cracking reaction of a gas-phase catalyst is not involved in the treatment process, and the mixed gas directly enters a vacuum-pumping system through the catalytic cracking tanks. In a vacuum pumping system, the heavier oil in the mixed gas is liquefied and separated from the non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavy oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process totally obtains 173g of clean water (38.1%), total oil recovery (light oil content and heavier oil content) 197g (43.36%), residual oil sand soil 77.8g (17.14%), oil content 1.5% o and non-condensable gas 6.4g (1.4%).
Example 2 light oil Dry type oily sludge innocent treatment Medium-sized test device
A process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
350kg of oily sludge (containing 5.4% of oil, 30.5% of water and 64.1% of silt) after the reduction treatment of a certain oil field is taken and placed in an oil sludge pool, the oily sludge is conveyed to a first dewatering furnace and a second dewatering furnace by a first screw conveyor after the step of heating pretreatment (the heating temperature is 50 ℃ and the heating time is 30 min) for heating dewatering (the heating temperature is 110 ℃ and the heating time is 30 min), and in the heating dewatering process, the oily sludge is pushed forward by the screw conveyor in the dewatering furnaces to enter an oil sludge water separator. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 390 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, during the forward pushing and heating process of the oily sludge, the residual oil in the oily sludge is gasified into heavier oil gas (referred to as the heavier oil gas and is distinguished from the light oil gas obtained in the dehydration process). The heavier oil gas moves upwards in the deoiling furnace, enters an oil-gas separation section of the oil-sludge-gas separator, and enters the dust remover through an upper outlet through a pipeline. Heavy oil obtained by treating oily sludge by equipment is contained in the dust remover and used as an adsorbent, and heavy oil gas generated in the deoiling and heating process enters the dust remover at an inlet which is 8cm below the page of the heavy oil in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and mixed gas is purified. The purified heavier oil gas enters two catalytic cracking tanks through pipelines, contacts with a gas phase catalyst (MFI molecular sieve catalyst, columnar, 3mm in diameter and 10mm in length) in the catalytic cracking tanks to perform catalytic cracking reaction, generates mixed gas of heavier oil gas and non-condensable gas, and is introduced into a vacuum pumping system. In a vacuum pumping system, the heavier oil in the mixed gas is liquefied and separated from the non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavier oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process obtains 102.8kg (29.4%) of clean water, 17.2kg (4.9%) of total recovered oil (light oil and heavier oil), 230kg (65.7%) of residual oil sand soil, oil content of 1.7%, and non-condensable gas is directly combusted and not metered.
Example 3 harmless treatment test of oily sludge of heavy crude oil (thickened oil) in certain oil field
A process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
350kg of oily sludge (containing 5.4% of oil, 30.5% of water and 64.1% of silt) after the reduction treatment of a certain oil field is taken and placed in an oil sludge pool, the oily sludge is conveyed to a first dewatering furnace and a second dewatering furnace by a first screw conveyor after the step of heating pretreatment (the heating temperature is 30 ℃ and the heating time is 30 min) for heating dewatering (the heating temperature is 100 ℃ and the heating time is 30 min), and in the heating dewatering process, the oily sludge is pushed forward by the screw conveyor in the dewatering furnaces to enter an oil sludge water separator. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 345 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, during the forward pushing and heating process of the oily sludge, the residual oil in the oily sludge is gasified into heavier oil gas (referred to as the heavier oil gas and is distinguished from the light oil gas obtained in the dehydration process). The heavier oil gas moves upwards in the deoiling furnace, enters an oil-gas separation section of an oil-sludge-gas separator, and enters a dust remover through an upper outlet through a pipeline. Heavy oil obtained by treating oily sludge by equipment is contained in the dust remover and used as an adsorbent, and heavy oil gas generated in the deoiling and heating process enters the dust remover at an inlet which is 8cm below the page of the heavy oil in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and mixed gas is purified. The purified heavier oil gas enters two catalytic cracking tanks through pipelines, and contacts with a gas phase catalyst (a molybdenum-nickel ultrastable Y-shaped molecular sieve catalyst which is columnar, 3mm in diameter and 10mm in length) in the catalytic cracking tanks to perform catalytic cracking reaction, and mixed gas of the heavier oil gas and noncondensable gas is generated and introduced into a vacuum pumping system. The vacuum pumping system is responsible for forming negative pressure (600 mm mercury) in the deoiling furnace, so that the heavier oil in the oily sludge can be analyzed and gasified conveniently. In a vacuum pumping system, heavier oil in the mixed gas is cooled and liquefied and is separated from non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavier oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process totally obtains 37g (10.3%) of clean water, 50g (13.9%) of total recovered oil (light oil and heavier oil), 207g (57.5%) of residual oil sand soil, oil content of 1.3% o and non-condensable gas of 66g (18.3%).
example 4 drilling oil based mud waste innocent treatment test
A process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
246g of oil-based mud waste (8.5% of oil, 20.9% of water and 70.6% of silt) is taken, added with a demulsifier and then placed in an oil mud pool, and is conveyed to a first dewatering furnace and a second dewatering furnace by a first screw conveyor to be heated and dewatered (the heating temperature is 100 ℃ and the heating time is 30 min) after the step of heating pretreatment (the heating temperature is 40 ℃ and the heating time is 30 min), and in the heating and dewatering process, the oily mud is pushed forward by the screw conveyor in the dewatering furnaces to enter an oil-mud-water separator. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 310 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, the oily sludge contacts with a liquid phase catalyst (ZSM-5 molecular sieve catalyst, round particles and 0.5mm in size) arranged at a proper position in the deoiling furnace in the forward pushing and heating process and generates a first-stage catalytic cracking reaction, and the residual oil in the oily sludge is cracked into heavier oil gas (the heavier oil gas is distinguished from the light oil gas obtained in the dehydration process) and non-condensable gas mixed gas. The mixed oil gas moves upwards in the deoiling furnace, and enters an oil-gas separation section of the oil-sludge-gas separator through an upper outlet and a pipeline into a dust remover. Heavy oil obtained by treating oily sludge by equipment is contained in a dust remover and used as an adsorbent, mixed gas of heavy oil gas and non-condensable gas generated by deoiling and catalytic cracking enters the dust remover at an inlet which is 10cm below a heavy oil page in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and the mixed gas is purified. The purified mixed gas of heavier oil gas and non-condensable gas enters two catalytic cracking tanks through pipelines, and contacts with a gas phase catalyst (a molybdenum-nickel ultrastable Y-shaped molecular sieve catalyst which is columnar, has the diameter of 3mm and the length of 10 mm) in the catalytic cracking tanks to generate a secondary catalytic cracking reaction, and the mixed gas of heavier oil gas and more non-condensable gas components is further generated through cracking. The mixed gas directly enters a vacuum-pumping system through a catalytic cracking tank. The vacuum pumping system is responsible for forming negative pressure (600 mm mercury) in the deoiling furnace, so that the heavier oil in the oily sludge can be analyzed and gasified conveniently. In a vacuum pumping system, heavier oil in the mixed gas is cooled and liquefied and is separated from non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavier oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process totally obtains 51.1g (20.8%) of clean water, 17.7g (7.2%) of total recovered oil (light oil and heavier oil), 175.3g (71.2%) of residual oil sand soil, 2.47% o of oil content, and 1.9g (0.8%) of non-condensable gas.
Example 5 Medium-sized test device of well drilling oil base mud discarded object innocent treatment
A process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
145kg of oil-based mud waste (containing 8.5% of oil, 20.9% of water and 70.6% of silt) is taken, added with a demulsifier and then placed in an oil mud pool, and is conveyed to a first dewatering furnace and a second dewatering furnace by a first screw conveyor to be heated and dewatered (heating temperature is 110 ℃ and heating time is 30 min) after the step of heating pretreatment (heating temperature is 50 ℃ and heating time is 30 min), and in the heating and dewatering process, the oil-containing mud is pushed forward by the screw conveyor in the dewatering furnaces to enter an oil mud-water separator. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 330 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, the oily sludge contacts with a liquid phase catalyst (ZSM-5 molecular sieve catalyst, round particles and 0.5mm in size) arranged at a proper position in the deoiling furnace in the forward pushing and heating process and generates a first-stage catalytic cracking reaction, and the residual oil in the oily sludge is cracked into heavier oil gas (the heavier oil gas is distinguished from the light oil gas obtained in the dehydration process) and non-condensable gas mixed gas. The mixed oil gas moves upwards in the deoiling furnace, and enters an oil-gas separation section of the oil-sludge-gas separator through an upper outlet and a pipeline into a dust remover. Heavy oil obtained by treating oily sludge by equipment is contained in a dust remover and used as an adsorbent, mixed gas of heavy oil gas and non-condensable gas generated by deoiling and catalytic cracking enters the dust remover at an inlet which is 12cm below a heavy oil page in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and the mixed gas is purified. The purified mixed gas of heavier oil gas and non-condensable gas enters two catalytic cracking tanks through pipelines, and contacts with a gas phase catalyst (a molybdenum-nickel ultrastable Y-shaped molecular sieve catalyst which is columnar, has the diameter of 3mm and the length of 10 mm) in the catalytic cracking tanks to generate a secondary catalytic cracking reaction, and the mixed gas of heavier oil gas and more non-condensable gas components is further generated through cracking. The mixed gas directly enters a vacuum-pumping system through a catalytic cracking tank. The vacuum pumping system is responsible for forming negative pressure (600 mm mercury) in the deoiling furnace, so that the heavier oil in the oily sludge can be analyzed and gasified conveniently. In a vacuum pumping system, heavier oil in the mixed gas is cooled and liquefied and is separated from non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavier oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process totally obtains 29.3kg (20.2%) of clean water, 10.0kg (6.9%) of total recovered oil (light oil and heavier oil), 103.1g (71.1%) of residual oil sand soil, and 2.53% o of oil content, and 2.6kg (1.8%) of non-condensable gas is obtained.
Example 6 harmless treatment of oil-containing sludge mixed with crude oil and silt on the ground of a plastic bag in a well drilling site of a certain oil field
a process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
112g of oil-containing sludge and plastic, namely the total weight of the oil-containing sludge and the plastic, and 84g of the oil sludge (52.7% of oil, 6.0% of water, 41.3% of silt and sand and 28g of waste plastic) are placed in an oil sludge pool, and are conveyed to a first dewatering furnace and a second dewatering furnace by a first screw conveyor after being subjected to heating pretreatment (the heating temperature is 30 ℃ and the heating time is 30 min) for heating and dewatering (the heating temperature is 95 ℃ and the heating time is 30 min), and in the heating and dewatering process, the oil-containing sludge is pushed forward by the screw conveyor in the dewatering furnace to enter an oil sludge water separator. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor, and 30g of waste engine oil is added into the deoiling furnace as an organic solvent in the process. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 380 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, the oily sludge contacts with a liquid-phase catalyst (ZSM-5 molecular sieve catalyst, round particles and 0.5mm in size) arranged at a proper position in the deoiling furnace in the forward pushing and heating process and generates a catalytic cracking reaction, and the residual oil in the oily sludge is cracked into heavier oil gas (the heavier oil gas is distinguished from the light oil gas obtained in the dehydration process) and non-condensable gas mixed gas. The mixed oil gas moves upwards in the deoiling furnace, and enters an oil-gas separation section of the oil-sludge-gas separator through an upper outlet and a pipeline into a dust remover. Heavy oil obtained by treating oily sludge by equipment is contained in a dust remover and used as an adsorbent, mixed gas of heavy oil gas and non-condensable gas generated by deoiling and catalytic cracking enters the dust remover at an inlet which is 12cm below a heavy oil page in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and the mixed gas is purified. The purified mixed gas of the heavy oil gas and the non-condensable gas enters the two catalytic cracking tanks through pipelines, so that the secondary catalytic cracking reaction of a gas-phase catalyst is not involved in the treatment process, and the mixed gas directly enters a vacuum-pumping system through the catalytic cracking tanks. The vacuum pumping system is responsible for forming negative pressure (600 mm mercury) in the deoiling furnace, so that the heavier oil in the oily sludge can be analyzed and gasified conveniently. In a vacuum pumping system, heavier oil in the mixed gas is cooled and liquefied and is separated from non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavier oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process obtains 18.5kg (14.5%) of clean water, and 48.5kg (37.9%) of total oil (light oil and heavier oil), wherein 1.05kg of oil is produced by plastic cracking, 56.6kg (44.2%) of residual oil sand soil, the oil content is 2.3 per mill, and the non-condensable gas is produced by oil-containing sludge treatment and is combusted, and no measurement is carried out.
Example 7 harmless treatment test of solidified oily sludge in early landfill treatment of Xinjiang oil field
A process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
The method comprises the steps of crushing 382g (25.2% of oil, 5.3% of water and 69.5% of silt) of oily sludge subjected to early landfill treatment in an oil field of Xinjiang by a jaw crusher, granulating, adding 95g of water, fully stirring, adding a demulsifier, placing the mixture into an oil sludge pool, performing heating pretreatment (the heating temperature is 40 ℃ and the heating time is 30 min), conveying the mixture into a first dewatering furnace and a second dewatering furnace by a first spiral conveyor, performing heating dewatering (the heating temperature is 100 ℃ and the heating time is 30 min), and pushing the oily sludge forwards into a water separator by the spiral conveyor in the dewatering furnaces in the heating dewatering process. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 385 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, the oily sludge contacts with a liquid-phase catalyst (ZSM-5 molecular sieve catalyst, round particles and 0.5mm in size) arranged at a proper position in the deoiling furnace in the forward pushing and heating process and generates a catalytic cracking reaction, and the residual oil in the oily sludge is cracked into heavier oil gas (the heavier oil gas is distinguished from the light oil gas obtained in the dehydration process) and non-condensable gas mixed gas. The mixed oil gas moves upwards in the deoiling furnace, and enters an oil-gas separation section of the oil-sludge-gas separator through an upper outlet and a pipeline into a dust remover. Heavy oil obtained by treating oily sludge by equipment is contained in a dust remover and used as an adsorbent, mixed gas of heavy oil gas and non-condensable gas generated by deoiling and catalytic cracking enters the dust remover at an inlet which is 10cm below a heavy oil page in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and the mixed gas is purified. The purified mixed gas of the heavy oil gas and the non-condensable gas enters the two catalytic cracking tanks through pipelines, so that the secondary catalytic cracking reaction of a gas-phase catalyst is not involved in the treatment process, and the mixed gas directly enters a vacuum-pumping system through the catalytic cracking tanks. In a vacuum pumping system, the heavier oil in the mixed gas is liquefied and separated from the non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavy oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process totally obtains 113.2g (23.7%) of clean water, 110.2g (23.1%) of total recovered oil (light oil and heavier oil), 253.1g (53.1%) of residual oil sand soil, and 0.48% of oil content, and obtains 0.4g (0.1%) of non-condensable gas.
Example 8 innocent treatment test of mixture of oily sludge and construction waste in original Nanyang oil field oil extraction plant
A process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
The method comprises the steps of taking 402g of a mixture of oily sludge and construction waste of an oil production plant, wherein 70g of the construction waste sundries and 332g of the oily sludge (54.3% of oil, 24.8% of water and 20.9% of silt) are filtered to obtain 65.8g of solid sundries (mainly the construction waste sundries), adding a demulsifier, placing the mixture into an oil sludge pool, carrying out heating pretreatment (the heating temperature is 50 ℃ and the heating time is 30 min), conveying the mixture into a first dewatering furnace and a second dewatering furnace by a first spiral conveyor to carry out heating dewatering (the heating temperature is 110 ℃ and the heating time is 30 min), and in the heating dewatering process, pushing the oily sludge forwards into an oil sludge water separator by the spiral conveyor in the dewatering furnace. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 385 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, the oily sludge contacts with a liquid phase catalyst (ZSM-5 molecular sieve catalyst, round particles and 0.5mm in size) arranged at a proper position in the deoiling furnace in the forward pushing and heating process and generates a first-stage catalytic cracking reaction, and the residual oil in the oily sludge is cracked into heavier oil gas (the heavier oil gas is distinguished from the light oil gas obtained in the dehydration process) and non-condensable gas mixed gas. The mixed oil gas moves upwards in the deoiling furnace, and enters an oil-gas separation section of the oil-sludge-gas separator through an upper outlet and a pipeline into a dust remover. Heavy oil obtained by treating oily sludge by equipment is contained in a dust remover and used as an adsorbent, mixed gas of heavy oil gas and non-condensable gas generated by deoiling and catalytic cracking enters the dust remover at an inlet which is 12cm below a heavy oil page in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and the mixed gas is purified. The purified mixed gas of heavier oil gas and non-condensable gas enters two catalytic cracking tanks through pipelines, and contacts with a gas phase catalyst (a molybdenum-nickel ultrastable Y-shaped molecular sieve catalyst which is columnar, has the diameter of 3mm and the length of 10 mm) in the catalytic cracking tanks to generate a secondary catalytic cracking reaction, and the mixed gas of heavier oil gas and more non-condensable gas components is further generated through cracking. The mixed gas directly enters a vacuum-pumping system through a catalytic cracking tank. The vacuum pumping system is responsible for forming negative pressure (600 mm mercury) in the deoiling furnace, so that the heavier oil in the oily sludge can be analyzed and gasified conveniently. In a vacuum pumping system, heavier oil in the mixed gas is cooled and liquefied and is separated from non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavier oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process totally obtains 67.7g (20.1%) of clean water, 150.4g (44.7%) of total recovered oil (light oil and heavier oil), 78.2g (23.3%) of residual oil sand soil, and oil content of 1.8% o, and 40g (11.9%) of non-condensable gas is obtained.
Example 9 innocent treatment of sludge deposited in a refinery and weed-containing sludge
A process for treating oily sludge based on the oily sludge harmless treatment equipment comprises the following steps:
Taking 128kg of oily sludge (containing 42.5% of oil, 16.0% of water, 41.5% of silt and 41.5% of sand and 2kg of weed sundries), filtering the oily sludge to obtain 1.8kg of sundries (mainly containing the oily sludge accumulated and mixed with the sundries such as weeds) and then placing the sundries in an oily sludge pool, carrying out heating pretreatment (the heating temperature is 30 ℃ and the heating time is 30 min) and then conveying the oily sludge to a first dewatering furnace and a second dewatering furnace by a first spiral conveyor for heating dewatering (the heating temperature is 95 ℃ and the heating time is 30 min), wherein in the heating dewatering process, the oily sludge is pushed forward by the spiral conveyor in the dewatering furnace to enter an oily sludge-water separator. In first dewatering furnace and second dewatering furnace, oily sludge heating dehydration back, wherein light oil divides the gasification and becomes light oil gas and forms the mist with vapor and noncondensable gas and gets into the heating coil of sludge water separator top pipeline entering sludge oil pond bottom through the heating coil, preheats the oily sludge of treating in the sludge oil pond through heating coil. And then, the mixed gas enters a condensation cooler, after the mixed gas is fully cooled by circulating cooling water of equipment, water vapor and light oil gas in the mixed gas are liquefied, and the liquefied water vapor and the non-condensable gas enter an oil-water-gas separator together. In the oil-water separator, on one hand, non-condensable gas enters a gas storage tank through a corresponding pipeline through an outlet at the top of the oil-water separator, and then is led to a first dehydration furnace and a second dehydration furnace or a deoiling burner of the device to be used as fuel for combustion or combustion treatment; on the other hand, the liquefied light oil and sewage are naturally layered at the bottom of the oil-water separator, so that separation is realized. The sewage enters a sewage treatment system through a pipeline, after standing for 30min, impurities are precipitated and removed, purified clear water enters a water cooling tower through the pipeline and is stored as equipment cooling water, a condensation cooler and a pump in a vacuum pumping system are cooled, and the purified clear water can be discharged outside after surplus time. And the light oil separated by the oil-water separator enters a light oil storage tank for temporary storage, and finally enters a fuel oil tank for storage and is used as fuel for a first dehydration furnace and a second dehydration furnace of the equipment and a deoiling furnace or sold for sale. After the dewatered oily sludge is pushed into the oil-sludge-water separator by the screw conveying mechanisms in the first dewatering furnace and the second dewatering furnace, the dewatered oily sludge naturally sinks to the bottom of the oil-sludge-water separator, and is conveyed into the deoiling furnace through the second screw conveyor. The deoiling furnace consists of two sections of heating furnaces and two spiral conveying mechanisms. After the sludge enters the deoiling furnace, the dewatered oily sludge is pushed forwards and heated by a first spiral conveying mechanism in the first section of the deoiling furnace, and in order to ensure that the treated sludge and sand meet the requirements of national standards (GB 4284-2018), the oily sludge conveyed to the terminal by the first spiral conveying mechanism is conveyed into the next section of the deoiling furnace and further pushed forwards and heated by a second spiral conveying mechanism (the heating temperature is 310 ℃ in the pushing and heating process in the two sections of the deoiling furnace, and the total heating time is 30 min). In the deoiling furnace, the oily sludge contacts with a liquid-phase catalyst (ZSM-5 molecular sieve catalyst, round particles and 0.5mm in size) arranged at a proper position in the deoiling furnace in the forward pushing and heating process and generates a catalytic cracking reaction, and the residual oil in the oily sludge is cracked into heavier oil gas (the heavier oil gas is distinguished from the light oil gas obtained in the dehydration process) and non-condensable gas mixed gas. The mixed oil gas moves upwards in the deoiling furnace, and enters an oil-gas separation section of the oil-sludge-gas separator through an upper outlet and a pipeline into a dust remover. Heavy oil obtained by treating oily sludge by equipment is contained in a dust remover and used as an adsorbent, mixed gas of heavy oil gas and non-condensable gas generated by deoiling and catalytic cracking enters the dust remover at an inlet which is 10cm below a heavy oil page in the dust remover and is fully contacted with the heavy oil adsorbent, wherein micro dust is removed, and the mixed gas is purified. The purified mixed gas of the heavy oil gas and the non-condensable gas enters the two catalytic cracking tanks through pipelines, so that the secondary catalytic cracking reaction of a gas-phase catalyst is not involved in the treatment process, and the mixed gas directly enters a vacuum-pumping system through the catalytic cracking tanks. In a vacuum pumping system, the heavier oil in the mixed gas is liquefied and separated from the non-condensable gas, and the heavier oil enters an oil storage tank for temporary storage and then is sent into a heavy oil tank for storage; the non-condensable gas enters the gas storage tank together with the non-condensable gas obtained by separation in the dehydration process, and then is led to the first dehydration furnace and the second dehydration furnace of the device or the deoiling burner to be used as fuel for combustion or combustion treatment. And oil content of the oily sludge in the deoiling furnace is removed to obtain residual oil and sandy soil, the residual oil and sandy soil are pushed to a residual oil-sandy soil separation section of the oil-sludge-gas separator by a second spiral conveying mechanism, and the residual oil and sandy soil naturally settle at the bottom of the deoiling furnace and enter a slag receiving pool through a bottom outlet. After entering the slag receiving pool, the preheated residual oil and sandy soil are conveyed to a second dehydration furnace through a third screw conveyor and used as a heat source to heat the oily sludge subjected to dehydration treatment. The whole treatment process obtains 18.5kg (14.7%) of clean water, 48.5kg (38.4%) of total recovered oil (light oil and heavier oil), 56.8g (45.0%) of residual oil sand soil, oil content of 2.3 per mill, and non-condensable gas combustion treatment without metering is obtained.

Claims (10)

1. The oily sludge harmless treatment equipment is characterized by comprising an oily sludge pretreatment device, an oily sludge demulsification dehydration device, an oily sludge deoiling device and an oily sludge catalytic cracking device which are sequentially connected;
The device also comprises a sewage recovery, purification and cyclic utilization device, an oil recovery device and a non-condensable gas recovery, storage and utilization device; the sewage recovery, purification and cyclic utilization device is connected with the oily sludge demulsification and dehydration device, and the oil recovery device is connected with the oily sludge demulsification and dehydration device, the oily sludge deoiling device and the oily sludge catalytic cracking device; the noncondensable gas recycling, storing and utilizing device is connected with the oily sludge demulsification and dehydration device and the oily sludge catalytic cracking device;
The oily sludge pretreatment device comprises an oily sludge pool (1) and a heating coil arranged at the bottom of the oily sludge pool;
the oil-containing sludge demulsification dehydration device comprises an oil sludge feeding bin (3), at least one dehydration furnace (4) connected with the oil sludge feeding bin (3), and an oil sludge water separator (5) connected with one end of the dehydration furnace (4); the dehydration furnace is provided with an inner layer and an outer layer, and comprises an inner layer pipeline for conveying oily sludge to be dehydrated and an outer layer pipeline for conveying heat; the oil sludge feeding bin (3) is connected with one end of the oil sludge pool (1) through a first screw conveyor (2); one end of a heating coil at the bottom of the oil sludge pool (1) is connected with the top of the oil sludge-water separator (5), and the other end of the heating coil is connected with an oil recovery device;
the deoiling device for the oil-containing sludge comprises a deoiling furnace (7), an oil-sludge separator arranged at one end of the deoiling furnace (7), a dust remover (9) connected with the top end of the oil-sludge separator, and a slag receiving pool (10) positioned at the bottom of the oil-sludge separator; the deoiling furnace is provided with an inner layer and an outer layer and comprises an inner layer pipeline for conveying sludge to be deoiled and a heating layer for conveying heat; the deoiling furnace is connected with the bottom of the oil sludge-water separator (5) through a second screw conveyor (6); the slag receiving tank (10) is connected with an outer layer pipeline of the dehydration furnace (4) through a third screw conveyor (11); the heating layer of the deoiling furnace (7) is connected with the outer layer pipeline of the dewatering furnace (4).
2. the oily sludge harmless treatment equipment according to claim 1, wherein the oil recovery device comprises a primary recovery device and a secondary recovery device, the primary recovery device comprises a condensation cooler (18) connected with a heating coil at the bottom of the oily sludge pool (1), an oil-water separator (19) connected with the condensation cooler (18), a light oil pump (24) connected with the oil-water separator (19), a light oil storage tank (25) connected with the light oil pump (24), and a fuel oil tank connected with the light oil storage tank (25) through a dump oil pump (26); the fuel oil tank is connected with an outer layer pipeline of the dehydration furnace (4) and a heating layer of the deoiling furnace (7);
the secondary recovery device comprises a vacuum pumping system (13) connected with the top of the oily sludge catalytic cracking device, an oil storage tank (14) connected with an oil pump in the vacuum pumping system (13), a heavy oil pump (15) connected with the oil storage tank (14), a heavy oil tank connected with the heavy oil pump (15), an oil storage tank (27) connected with the bottom of the dust remover (9), and an oil circulating pump (28) connected with an outlet of the oil storage tank (27); the oil circulating pump (28) is connected with the upper part of the dust remover (9); the heavier oil tank is connected with the fuel oil tank.
3. the oily sludge harmless treatment equipment according to claim 2, wherein the sewage recovery, purification and recycling device comprises a sewage pump (20) connected with the bottom of the oil-water separator, a sewage treatment system (21) connected with the sewage pump (20), a clean water pump (22) connected with the sewage treatment system (21), and a water cooling tower (23) connected with the clean water pump (22); the water cooling tower (23) is connected with a condensing cooler (18) to be cooled and a water pipeline in the vacuum-pumping system (13) through a cooling circulating pipeline; the non-condensable gas recycling, storing and utilizing device comprises a gas storage tank (16) and a Roots blower (17) arranged on one side of the gas storage tank (16); the gas storage tank (16) is connected with the oil-water separator (19) and the vacuumizing system (13); one side of the Roots blower (17) is connected with the fire nozzles of the deoiling furnace (7) and the dewatering furnace (4).
4. The equipment for harmless treatment of oily sludge according to claim 1, wherein the oily sludge catalytic cracking device is composed of two catalytic cracking tanks (12) which are arranged side by side and are provided with gas phase catalysts; and a liquid phase catalyst is arranged in the deoiling furnace.
5. The oily sludge harmless treatment equipment according to claim 1, wherein the deoiling furnace adopts a two-section propulsion heating structure, wherein one end of the first section propulsion heating structure is connected with the second screw conveyor (6), the top of the other end of the first section propulsion heating structure is connected with an oil-gas separation section (8-1) of an oil-sludge separator, and the bottom of the other end of the first section propulsion heating structure is connected with one end of the second section propulsion heating structure; the upper part of the other end of the second section of the propulsion heating structure is connected with an oil-gas separation section of the oil-sludge gas separator, and the bottom of the second section of the propulsion heating structure is connected with a residual oil-sand separation section (8-2) of the oil-sludge gas separator; the bottom of the oil sludge separator residual oil sand separation section is connected with a slag receiving pool (10).
6. The apparatus for harmless treatment of oily sludge according to claim 1, wherein pall rings are provided at the inlets of the dehydration furnace and the deoiling furnace; and spiral conveying mechanisms are arranged in the dehydration furnace and the deoiling furnace.
7. The process for treating oily sludge by using the equipment for harmless treatment of oily sludge according to any one of claims 1 to 6, which comprises the steps of:
(1) Placing the oily sludge in an oily sludge pool for heating pretreatment;
(2) conveying the oil-containing sludge subjected to heating pretreatment to a dehydration furnace for heating dehydration, cooling the mixed gas obtained after heating dehydration by a condensing cooler, and separating to obtain light oil, sewage and non-condensable gas;
(3) conveying the heated and dehydrated oily sludge to a deoiling furnace for liquid-phase catalytic cracking reaction;
(4) dedusting mixed gas obtained by liquid-phase catalytic cracking reaction, conveying the mixed gas into a catalytic cracking tank for gas-phase catalytic cracking reaction, and cooling and separating the obtained mixed gas by a vacuum pumping system to obtain heavier oil and non-condensable gas;
in the step (1), a sludge pool is heated by using the latent heat of steam generated by mixed gas during dehydration;
In the step (2), the dehydration furnace is heated by utilizing the waste heat brought out by the silt residue obtained after liquid-phase catalytic cracking, and the dehydration furnace is heated by utilizing the flue gas waste heat of the dehydration furnace;
Purifying the sewage obtained in the step (2) and storing the sewage in a cooling tower, cooling the pump in the condensation cooler and the vacuum pumping system by cooling water in the cooling tower, and discharging the sewage when the sewage is excessive;
Storing the light oil obtained in the step (2) in a light oil storage tank, and finally selling or entering a fuel oil tank for storage and serving as fuel of a dehydration furnace and a deoiling furnace;
The non-condensable gas obtained in the step (2) and the step (4) enters a gas storage tank through a corresponding pipeline and then is led to a fire nozzle of a dehydration furnace or a deoiling furnace to be used as fuel for combustion;
And (4) storing the heavier oil obtained in the step (4) in a heavier oil tank, and using the heavier oil as an adsorbent in the dust removal of the mixed gas to remove the fine dust in the mixed gas obtained by the liquid phase catalytic cracking reaction or as fuel for a heating dehydration furnace or a deoiling furnace.
8. The process of claim 7, wherein the demulsifier is added to the oily sludge to be treated in the step (1), and the mixed gas inlet of the deduster is positioned 8 ~ 10cm below the liquid level of the heavier oil in the deduster in the dedusting process in the step (4).
9. The process as claimed in claim 7, wherein the temperature of the heating pretreatment is 30 ~ 50 ℃, the temperature of the heating dehydration in the dehydration furnace is 95-110 ℃, and the temperature of the liquid phase catalytic cracking reaction is 310-390 ℃.
10. the process according to claim 7, wherein for the oily sludge containing waste plastics, used oil is added as a solvent when the oily sludge enters the deoiling stage of step (3); for the solidified oily sludge dug out due to longer stacking time or deep burying, the oily sludge needs to be crushed and added with water for full stirring in the heating pretreatment process in the step (1) besides heating; for the oily sludge with sundries piled on the surface layer of the oil sludge, in addition to heating in the heating pretreatment process in the step (1), the oily sludge needs to be crushed and subjected to primary filtration treatment at the same time.
CN201910882303.3A 2019-09-18 2019-09-18 Oily sludge harmless treatment process and equipment Pending CN110550846A (en)

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CN111925085A (en) * 2020-08-25 2020-11-13 西安德兴环保科技有限公司 Oil sludge treatment method suitable for heavy bottom oil sludge and tank cleaning oil sludge
CN112608757A (en) * 2020-12-15 2021-04-06 深圳市环保科技集团有限公司 Anaerobic dry distillation treatment method for waste grinding slag
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CN111377584A (en) * 2020-04-24 2020-07-07 中国石油大学(华东) Oil-containing sludge vacuum catalytic microwave cracking method
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