CN216550068U - Harmless recycling oily sludge treatment system - Google Patents
Harmless recycling oily sludge treatment system Download PDFInfo
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Abstract
The invention provides a system for harmless recycling treatment of oily sludge, which comprises an oxidation extraction system, an extraction solvent generation system and a sludge drying system. The oxidation extraction system is communicated with the sludge drying system, the sludge drying system is communicated with the extraction solvent generation system, and the oxidation extraction system is communicated with the extractant generation system. The invention can efficiently complete the oil removing task of various types of oily sludge and has excellent universality. In the process of completing the harmless resource treatment of the oily sludge, the used extracting agent is from the system, and the additional purchase of the extracting agent is not needed, so that the treatment cost of the oily sludge is obviously reduced. The oil content of the oily sludge purified by the system is less than 0.3 percent, the oil removal rate is more than 99 percent, the purified oily sludge can be buried or used for garden fertilizers and building materials, the recovered oil can be directly blended and electrically desalted, obvious economic benefit is generated, and the harmless recycling purpose of the oily sludge is realized.
Description
Technical Field
The invention relates to a system for harmless recycling treatment of oily sludge, in particular to a system for treating oily sludge by an oxidation-extraction combined method. The system can realize that the oily sludge meets the requirements of relevant national standards, achieves the aims of harmlessness, reduction and recycling, and belongs to the technical field of oily sludge oil removal and environmental protection.
Background
The annual output of the current oil field oil-containing sludge and refined three-sludge exceeds 300 ten thousand tons, and the current oil field oil-containing sludge and refined three-sludge are dangerous wastes. It is mainly from petroleum exploitation, transportation, refining and oily sewage treatment. The oil-containing sludge is found to be listed in the national hazardous waste list (HW-08) because the oil-containing sludge contains some toxic and harmful substances to human bodies and the like. The main methods for treating the oily sludge currently include: burial, conditioning-separation, incineration, heat treatment, coking, biological, solvent extraction, and oxidation.
The oily sludge has complex composition and different sources, but after treatment, the oil content of the oily sludge needs to meet the requirement that the oil content of the purified oily sludge is less than or equal to 0.3 percent in GB4284-2018 agricultural sludge pollutant control Standard. The burying method can only treat the oily sludge with low oil content, heavy metal element content and water content, and for most oily sludge, the burying requirement cannot be met, and secondary pollution is easy to generate; the quenching and tempering-separation method can realize the reduction target of the oily sludge, but still cannot meet the requirement that the oil content of the purified oily sludge is less than 0.3 percent; the incineration method has large treatment capacity and thorough treatment on the oily sludge, the treated residues can meet the burying requirement, but the method has large one-time investment, and the waste gas generated by treatment is easy to generate secondary waste gas pollution; the heat treatment method is a harmless treatment method, the temperature is gradually raised under the oxygen-free condition to crack organic matters in the oily sludge, gas generated by cracking is condensed and recovered, and the residual residues meet the burying requirement, but the temperature required by thermal cracking is higher (more than 500 ℃), the process condition is harsh, the investment is large, and secondary waste gas pollution is easy to generate; the coking method can promote the resource utilization of the oily sludge, but has requirements on the solid content of the oily sludge and influences the coke quality, and the oily sludge of oil field enterprises and the 'three sludge' of refining enterprises cannot adopt the method. The biological method has various modes for treating the oily sludge, has low selectivity on the oily sludge and simpler process operation, but has high requirement on the selection of biological bacteria and longer treatment period.
The solvent extraction method utilizes the principle of 'similarity and intermiscibility', is a method for dissolving and recycling the organic matters in the oily sludge by using an organic solvent, and the existing solvent extraction method has the defects of large dosage of the extracting agent, low solvent recovery rate and high cost due to complex composition and preparation process of the extracting agent and multiple extraction, thereby limiting the industrial application of the method. The oxidation method is a chemical method, and utilizes an oxidant to perform partial oxidation decomposition on macromolecules, colloidal asphaltenes and extracellular polymers of medium organic matters in the oily sludge, so that fine mud-containing particles or carbon powder are desorbed from oil, and the purpose of separating the oily sludge is achieved.
Patent CN111606531A discloses a low-temperature enhanced separation method for oily sludge, which mainly comprises four steps of flotation separation, centrifugal separation, fenton oxidation and gravity settling to purify the oily sludge. The method has a certain effect on the oily sludge at the bottom of the oil field tank, but the oil content of the purified oily sludge of the oil field tank bottom which is placed for a long time still can not reach the standard of 0.3 percent, and the recovered oil can not meet the requirement of direct blending electric desalting because the solid content (more than 2 percent) and the water content (more than 2 percent) exceed the standard.
Patent CN111718105A discloses a treatment device and method for degrading oily sludge based on the combination of ozone oxidation and hydrogen peroxide oxidation, in the method, surfactant is added to reduce the surface tension of oil-sludge-water three phases, aeration and oxidation are assisted to degrade the oily sludge, and the degraded sludge is used as a fertilizer for plants. However, the method has a long treatment period (only the aeration flow needs more than 6 hours), so that the treatment scale is not large, the oil content of the treated sludge cannot reach the national standard, the method has a certain effect on residual activated sludge with low oil content, but has no obvious effect on tank bottom oil-containing sludge with high oil content.
The patent CN103693824B discloses a deep extraction coking process for oily sludge, which comprises the steps of removing a solid phase of the oily sludge by a centrifugal method, extracting and separating an oily liquid phase from the solid phase by a solvent, and feeding the oily liquid phase into a coking device. The extracted solid phase is mixed with coal for burning. The method is more thorough in treating the oily sludge, but needs multiple times of extraction, and the extractant cannot be recycled, so that the cost is higher. The recovered oil enters a coking device instead of an electric desalting device, which causes resource waste.
Patent CN110845101A discloses an oily sludge harmless treatment system and a treatment method thereof, the method is more thorough in treating oily sludge, but the oily sludge at the bottom of an aging tank needs to be extracted for multiple times, so that the solvent loss is increased, the occupied area of equipment is larger, the treatment cost is higher, and the universality of the oily sludge is not good.
Patent CN 113003922A discloses a system for treating oily sludge by integrated high-efficiency hot washing-advanced oxidation combined treatment and an oily sludge treatment method, persulfate and ferroferric oxide are used as oxidizing agents, and a surfactant is used as a washing agent, so that the method has a certain oil removing effect on unaged falling oily sludge, but has poor effects on oily sludge at the bottom of an aged oily sludge tank and oily sludge of a sewage treatment plant, the oil content of the treated oily sludge is far less than the national standard, and the treatment period is longer (more than 48 hours), so that the method is not beneficial to large-scale treatment.
The invention provides a harmless recycling treatment method system for oily sludge, which treats the oily sludge by using an oxidation-extraction combined process, has the dual advantages of an oxidation method and an extraction method, and simultaneously has a synergistic effect. The used oxidation agent has high oxidation efficiency, the using amount of the oxidant is small, the method has universality for different types of oily sludge, the process is simple, the oily sludge treated by the oxidation agent is treated by an extraction method, the using amount of the extraction agent is small, and the extraction frequency is low. The whole process can realize large-scale treatment and high-efficiency treatment of the oily sludge, and the treatment cost is low. After treatment, the oil content in the oily sludge meets the requirements of national relevant standards (the oil content is less than 0.3 percent), and the oil removal rate is more than 99 percent. The recovered oil can be directly blended for electric desalting, thereby generating obvious economic benefit and realizing the aim of harmless resource of the oily sludge.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a system for harmless and resource treatment of oily sludge.
The utility model provides a innoxious resourceful treatment oiliness mud system, takes place system, sludge drying system including oxidation extraction system, extraction solvent, oxidation extraction system and sludge drying system are linked together, sludge drying system and extraction solvent take place the system and are linked together, oxidation extraction system and extractant take place the system and are linked together, its characterized in that: a liquid phase outlet of a three-phase separator of the oxidation extraction system is connected with an oil-water separator of the extraction solvent generation system, a solid phase outlet of a two-phase separator of the oxidation extraction system is connected with drying equipment of the sludge drying system, and a liquid phase outlet of the two-phase separator is connected with an oil-water separator of the extraction solvent regeneration system; a condenser of the sludge drying system is connected with a solid phase oil removal stirring tank of the oxidation extraction system; the light component outlet of the solvent generating tower of the extraction solvent generating system is respectively connected with the solid phase oil removing stirring tank and the heavy phase oil removing stirring tank of the oxidation extraction system.
The oxidation extraction system comprises: the oily sludge pipeline is connected with an oily sludge conditioning tank, the oily sludge conditioning tank is provided with a stirring device and an oxidizing agent inlet, and is connected with an oxidizing agent feeding pump, a mixed liquid outlet of the oily sludge conditioning tank is connected with an oily sludge conditioning tank output pump, an output pump of the oily sludge conditioning tank output pump is connected with a three-phase separator, a solid phase outlet of the three-phase separator is connected with a solid phase oil removing stirring tank, a heavy phase outlet of the three-phase separator is connected with a heavy phase oil removing stirring tank, and a liquid phase outlet of the three-phase separator is connected with an oil-water separator of an extraction solvent generation system;
a material outlet of the solid-phase oil removal stirring tank is connected with a discharge pump of the solid-phase oil removal stirring tank, and an outlet of the discharge pump of the solid-phase oil removal stirring tank is connected with the two-phase separator; the material outlet of the heavy phase oil removal stirring tank is connected with a discharge pump of the heavy phase oil removal stirring tank, the discharge pump outlet of the heavy phase oil removal stirring tank is connected with a two-phase separator, the solid phase outlet of the two-phase separator is connected with a screw conveyor, the screw conveyor is connected with drying equipment of a sludge drying system, and the liquid phase outlet of the two-phase separator is connected with an oil-water separator of an extraction solvent generation system.
The sludge drying system comprises: the solid phase screw conveyor connected with the two-phase separator of the oxidation extraction system is connected with a drying device, a gas phase outlet of the drying device is connected with a condenser, the condenser is connected with a solid phase oil removal stirring tank of the oxidation extraction system, and the drying device is provided with a solid phase outlet.
The extraction solvent generation system comprises: the water phase outlet of the oil-water separator is connected with a sewage treatment device, the oil phase outlet is connected with a crude oil tank, the crude oil tank is provided with a crude oil tank delivery pump, the outlet of the crude oil tank delivery pump is connected with a solvent generation tower, the light component outlet of the solvent generation tower is respectively connected with a solid phase oil removal stirring tank and a heavy phase oil removal stirring tank, the residual component outlet of the solvent generation tower is connected with a heat exchanger, and the product after the heat exchanger is sent to an oil refining device.
The solvent generation tower consists of an atmospheric tower and a vacuum tower.
A treatment method for harmless resource treatment of oily sludge comprises the following steps:
(1) oxidation extraction system
Introducing the oily sludge into an oily sludge conditioning tank from the outside of a boundary area, adding an oxidizing agent into the oily sludge conditioning tank by using a pump, and continuously stirring to carry out oxidation and oil removal. And (3) conveying the mixed liquid in the oily sludge preparation tank to a three-phase separator by using a pump, and performing solid-phase (large-particle bottom sludge) separation, heavy-phase (small-particle floating sludge) separation and liquid-phase separation. The solid phase separated by the three-phase separator is introduced into a solid phase oil removal stirring tank, the separated heavy phase is introduced into a heavy phase oil removal stirring tank, and the separated liquid phase is introduced into an oil-water separator.
And respectively conveying the materials in the solid-phase oil removal stirring tank and the materials in the heavy-phase oil removal stirring tank to a two-phase separator by using a pump for solid-liquid separation. The solid phase separated by the two-phase separator is introduced into a drying device, and the separated liquid phase is introduced into an oil-water separator.
(2) Sludge drying system
And conveying the solid phase separated by the two-phase separator to a drying device by using a screw conveyor, wherein the sludge dried by the drying device is used for burying, garden fertilizers or building materials. In the process of drying the sludge by the drying device, the generated steam is condensed by the condenser, and the generated liquid phase is introduced into the solid-phase oil removal stirring tank for extraction and oil removal.
(3) Extraction solvent generation system
The liquid phase separated by the three-phase separator and the liquid phase separated by the two-phase separator are respectively led into the oil-water separator, under the action of the oil-water separator, the water phase is led into the sewage treatment device, the oil phase is led into the crude oil tank, the oil in the crude oil tank is conveyed to the solvent generation tower by a pump, and the light component generated by the solvent generation tower is led into the solid phase oil removal stirring tank and the heavy phase oil removal stirring tank for extraction and oil removal. And cooling the residual components in the solvent generation tower by a heat exchanger, and introducing the residual components into an oil refining device.
The oxidizing agent in the step (1) comprises an oxidizing agent, an oxidizing auxiliary agent, a surfactant and a dispersing agent, wherein the oxidizing agent is one or two of hydrogen peroxide, concentrated sulfuric acid, potassium permanganate and concentrated nitric acid, and the addition amount of the oxidizing agent is 0.05-0.5% of the mass of the oily sludge to be treated; the oxidation promoter is a metal oxide (preferably MnO)2、Fe2O3、TiO2CuO), ferrous salts (preferably FeSO)4、FeCl2、Fe(NO3)2) The addition amount of the oxidation auxiliary agent is 0.03-0.06 percent of the addition amount of the oxidant; the surfactant is one or more of organic sulfonate (preferably dodecyl benzene sulfonate and hexadecyl benzene sulfonate), organic sulfate (preferably dodecyl sulfate and hexadecyl sulfate) and organic ammonium halide (preferably dodecyl trimethyl ammonium bromide and tetradecyl trimethyl ammonium chloride), and the addition amount of the surfactant is 0.01-0.4% of the mass of the oily sludge to be treated; the dispersant is one or two of sodium tripolyphosphate, sodium metasilicate and sodium hexametaphosphate, and the addition amount of the dispersant is 0.03-0.1 percent of the mass of the oily sludge to be treated.
The extractant in the step (2) and the step (3) is a light component generated by crude oil recovered in the oil-containing sludge purification process through a solvent generation tower 15, and the mass of the extractant is as follows: the mass of the oily sludge is 0.5-1.0: 1.
The solvent generation tower in the step (3) consists of an atmospheric tower and/or a vacuum tower.
During sludge drying, sludge separated by the two-phase separator needs to be dried at the temperature of 130-180 ℃, and gas generated in the drying process is condensed and recovered and is used as an extractant supplement in the heavy-phase oil removal tank and the solid-phase oil removal tank.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention has excellent universality to different kinds of oily sludge.
2. The extractant used in the invention is derived from light components distilled from the recovered crude oil after the oil-containing sludge is deoiled by a rectifying device, and no new extractant is purchased from the outside, so that the operation cost of the device is obviously reduced.
3. The oxidation-extraction combined process used in the invention ensures that the indexes of the treated oily sludge not only meet the national existing environmental protection standard, but also can recover the crude oil in the oily sludge, thereby generating economic benefit. The aim of resource harmless treatment of the oily sludge is fulfilled.
Drawings
FIG. 1 is a schematic view of a system for harmless resource treatment of oily sludge according to the present invention.
FIG. 1: 1-an oxidation extraction system, 2-an extraction solvent generation system, 3-a sludge drying system, 4-an oily sludge pipeline, 5-an oily sludge conditioning tank, 6-a three-phase separator, 7-an oxidation agent feeding pump, 9-a solid phase outlet of the three-phase separator, 10-a heavy phase outlet of the three-phase separator, 11-a liquid phase outlet of the three-phase separator, 12-a solid phase degreasing stirring tank, 13-a heavy phase degreasing stirring tank, 14-an oil-water separator, 15-a solvent generation tower, 16-a heat exchanger, 17-a crude oil tank, 18-a two-phase separator, 19-a condenser, 20-drying equipment, 21-a solid phase outlet of the drying equipment, 22-a sewage treatment device, 23-an oil refining device and 24-an oily sludge conditioning tank output pump, 25-solid phase oil removal stirring tank discharge pump, 26-heavy phase oil removal stirring tank discharge pump, 27-solid phase screw conveyor and 28-crude oil tank conveying pump.
Detailed Description
The present invention will be described in further detail with reference to the following data in conjunction with specific examples. The following examples are intended to illustrate the invention and are not intended to limit the scope of the invention in any way.
The oil content percentage of the oily sludge treated by the treatment method for oil removal and reduction of the oily sludge disclosed by the invention is represented by mass percentage, wherein the water content in the oily sludge and the oil content in the oily sludge are carried out by the following method.
The water content of the oily sludge is tested according to the method of GB/T212-2008.
The oil content in the oily sludge is tested according to the method of GB/T6504-2008.
The oil removal rate described in the following examples indicates the total organic matter removal rate of oily sludge after treatment by the method provided by the present invention.
Referring to fig. 1, a harmless resource treatment system for oily sludge comprises the following steps:
(1) oxidation extraction system
Oily sludge is introduced into an oily sludge conditioning tank 5 from the outside of a boundary area, and an oxidizing agent is added into the oily sludge conditioning tank 5 by a pump 7 and is continuously stirred for oxidizing and removing oil. The mixed liquid in the oily sludge preparation tank 5 is sent to a three-phase separator 6 by a pump 24, and solid phase (large-particle bottom sludge) separation, heavy phase (small-particle floating sludge) separation and liquid phase separation are performed. The solid phase separated by the three-phase separator 6 is introduced into a solid phase degreasing stirring tank 12, the separated heavy phase is introduced into a heavy phase degreasing stirring tank 13, and the separated liquid phase is introduced into an oil-water separator 14.
The materials in the solid phase degreasing agitation tank 12 and the materials in the heavy phase degreasing agitation tank 13 are respectively conveyed to the two-phase separator 18 by a pump 25 and a pump 26, and solid-liquid separation is performed. The solid phase separated by the two-phase separator 18 is introduced into a drying device 20, and the separated liquid phase is introduced into an oil-water separator 14.
(2) Sludge drying system
The solid phase separated by the two-phase separator 18 is conveyed to a drying device 20 by a screw conveyor 27, the dried sludge is used for burying, garden fertilizers or building materials, the generated steam is condensed by a condenser 19 in the sludge drying process, and the generated liquid phase is introduced into a solid phase oil removal stirring tank 12 for extraction and oil removal.
(3) Extraction solvent generation system
The liquid phase separated by the three-phase separator 6 and the liquid phase separated by the two-phase separator 18 are respectively introduced into the oil-water separator 14, under the action of the oil-water separator 14, the water phase is introduced into the sewage treatment device 22, the oil phase is introduced into the crude oil tank, the oil in the crude oil tank 17 is conveyed to the solvent generation tower 15 by a pump, and the light components generated by the solvent generation tower 15 are introduced into the solid phase oil removal stirring tank 12 and the heavy phase oil removal stirring tank 13 for extraction and oil removal. The remaining components of the solvent generation tower 15 are cooled by the heat exchanger 16 and introduced into the oil refining apparatus 23.
The oxidizing agent comprises an oxidizing agent, an oxidizing auxiliary agent, a surfactant and a dispersing agent, wherein the oxidizing agent is one or two of hydrogen peroxide, concentrated sulfuric acid, potassium permanganate and concentrated nitric acid, and the addition amount of the oxidizing agent is 0.05-0.5% of the mass of the oily sludge to be treated; the oxidation promoter is a metal oxide (preferably MnO)2、Fe2O3、TiO2CuO), ferrous salts (preferably FeSO)4、FeCl2、Fe(NO3)2) The addition amount of the oxidation auxiliary agent is 0.03-0.06 percent of the addition amount of the oxidant; the surfactant is one or more of organic sulfonate (preferably dodecyl benzene sulfonate and hexadecyl benzene sulfonate), organic sulfate (preferably dodecyl sulfate and hexadecyl sulfate) and organic ammonium halide (preferably dodecyl trimethyl ammonium bromide and tetradecyl trimethyl ammonium chloride), and the addition amount of the surfactant is 0.01-0.4% of the mass of the oily sludge to be treated; the dispersant is one or two of sodium tripolyphosphate, sodium metasilicate and sodium hexametaphosphate, and the addition amount of the dispersant is 0.03-0.1 percent of the mass of the oily sludge to be treated.
The extractant in the step (2) and the step (3) is a light component generated by crude oil recovered in the oil-containing sludge purification process through a solvent generation tower, and the mass of the extractant is as follows: the mass of the oily sludge is 0.5-1.0: 1.
The solvent generation tower in the step (3) consists of an atmospheric tower and a vacuum tower.
And drying the sludge separated by the two-phase separator at 130-180 ℃, and condensing and recovering gas generated in the drying process for use as an extractant replenisher in a heavy-phase oil removal tank and a solid-phase oil removal tank.
Example 1
The test is carried out by taking tank-cleaning oily sludge (oil content is 27.2 percent and water content is 38.3 percent) of a certain refinery company as a raw material and taking hydrogen peroxide as an oxidantThe addition amount is 0.5%; in MnO2The addition amount of the oxidation auxiliary agent is 0.03 percent, and the addition amount of the lauryl sodium sulfate is 0.01 percent; the adding amount of sodium metasilicate is 0.03%; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 0.5:1, the oil content of the oily sludge after treatment is 0.15%, and the oil removal rate is 99.44%.
Example 2
The method is characterized in that a test is carried out by taking tank-cleaning oily sludge (oil content is 27.2% and water content is 38.3%) of a certain refinery company as a raw material, potassium permanganate is taken as an oxidant, and the addition amount is 0.10%; with Fe2O3Is an oxidation assistant with the addition amount of 0.05 percent, and the sodium hexadecyl benzene sulfonate is a surfactant with the addition amount of 0.15 percent; the addition amount of the sodium tripolyphosphate is 0.05 percent; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 1.0:1, the oil content of the oily sludge after treatment is 0.19%, and the oil removal rate is 99.30%.
Example 3
The method is characterized in that a test is carried out by taking oily sludge (oil content is 41.4% and water content is 55.6%) of a dirty oil pool of a certain petrochemical company as a raw material, and concentrated sulfuric acid is taken as an oxidant, and the addition amount is 0.4%; CuO is used as an oxidation auxiliary agent, dodecyl trimethyl ammonium bromide with the addition of 0.06 percent is used as a surfactant, and the addition of 0.05 percent; the addition amount of sodium hexametaphosphate is 0.1 percent; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 0.6:1, the oil content of the oily sludge after treatment is 0.27%, and the oil removal rate is 99.34%.
Example 4
The method is characterized in that a test is carried out by taking oily sludge (oil content is 41.4% and water content is 55.6%) of a dirty oil pool of a certain petrochemical company as a raw material, and concentrated nitric acid is taken as an oxidant, and the addition amount is 0.30%; with TiO2Is an oxidation assistant with the addition of 0.05 percent, and the tetradecyl trimethyl ammonium chloride is a surfactant with the addition of 0.05 percent; the adding amount of sodium metasilicate is 0.05 percent; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 0.6:1, the oil content of the oily sludge after treatment is 0.25%, and the oil removal rate is 99.39%.
Example 5
From a certain refinery companyThe residual active oily sludge (oil content is 18.4 percent and water content is 27.4 percent) is used as a raw material for testing, hydrogen peroxide is used as an oxidant, and the addition amount is 0.2 percent; with FeSO4Is an oxidation assistant with the addition amount of 0.05 percent, and sodium hexadecyl sulfate is a surfactant with the addition amount of 0.2 percent; the adding amount of sodium metasilicate is 0.05 percent; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 1:1, the oil content of the oily sludge after treatment is 0.11%, and the oil removal rate is 99.40%.
Example 6
The test is carried out by taking residual active oily sludge (oil content is 18.4 percent and water content is 27.4 percent) of a certain refinery company as a raw material, and potassium permanganate is taken as an oxidant, and the addition amount is 0.4 percent; with FeCl2Is an oxidation assistant with the addition amount of 0.03 percent, and sodium hexadecyl sulfate is a surfactant with the addition amount of 0.2 percent; the adding amount of sodium metasilicate is 0.1%; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 0.5:1, the oil content of the oily sludge after treatment is 0.12%, and the oil removal rate is 99.34%.
Example 7
The method is characterized in that a test is carried out by taking tank-cleaning oily sludge (oil content is 27.2% and water content is 38.3%) of a certain refinery company as a raw material, and concentrated nitric acid is taken as an oxidant, and the addition amount is 0.3%; with Fe (NO)3)2Is an oxidation assistant with the addition amount of 0.03 percent, and the sodium dodecyl sulfate is a surfactant with the addition amount of 0.2 percent; the adding amount of sodium metasilicate is 0.08%; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 0.7:1, the oil content of the oily sludge after treatment is 0.22%, and the oil removal rate is 99.19%.
Example 8
A test is carried out by taking tank-cleaning oily sludge (oil content is 27.2% and water content is 38.3%) of a certain refinery company as a raw material, and taking concentrated sulfuric acid and potassium permanganate as oxidants with the addition amount of 0.5% (the addition amount of the concentrated sulfuric acid is 0.1% and the addition amount of the potassium permanganate is 0.4%); in MnO2Is an oxidation assistant with the addition amount of 0.03 percent, and the sodium dodecyl sulfate is a surfactant with the addition amount of 0.3 percent; the adding amount of sodium metasilicate is 0.03%; the mass ratio of the extracting agent to the oily sludge is 0.6:1, and the steps are carried out according to the above stepsThe oil content of the treated oily sludge is 0.17 percent, and the oil removal rate is 99.37 percent.
Example 9
The test is carried out by taking residual active oily sludge (oil content is 18.4 percent and water content is 27.4 percent) of a certain refinery company as a raw material, and taking hydrogen peroxide as an oxidant with the addition of 0.4 percent; in MnO2And TiO2Is used as an oxidation assistant and is added in an amount of 0.04% (MnO)2The addition amount is 0.02 percent and TiO2The addition amount is 0.02%), dodecyl trimethyl ammonium bromide is a surfactant, and the addition amount is 0.3%; the adding amount of sodium metasilicate is 0.07 percent; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 1:1, the oil content of the oily sludge after treatment is 0.16%, and the oil removal rate is 99.13%.
Example 10
The method is characterized in that an experiment is carried out by taking oily sludge (the oil content is 22.6 percent and the water content is 72.3 percent) at the bottom of a certain oil field tank as a raw material, potassium permanganate is taken as an oxidant, and the addition amount is 0.4 percent; with FeSO4Is an oxidation assistant, the addition amount is 0.05 percent, dodecyl trimethyl ammonium bromide and dodecyl benzene sulfonic acid sodium are surfactants, the addition amount is 0.15 percent (the addition amount of dodecyl trimethyl ammonium bromide is 0.05 percent, and the addition amount of dodecyl benzene sulfonic acid sodium is 0.1 percent); the addition amount of sodium hexametaphosphate is 0.1 percent; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 1:1, the oil content of the oily sludge after treatment is 0.19%, and the oil removal rate is 99.15%.
Example 11
The method is characterized in that a test is carried out by taking residual active oily sludge (with oil content of 18.4% and water content of 27.4%) of a certain refinery company as a raw material, hydrogen peroxide and concentrated sulfuric acid are taken as oxidants, and the addition amount of the hydrogen peroxide and the concentrated sulfuric acid is 0.5% (wherein the addition amount of the hydrogen peroxide is 0.3%, and the addition amount of the concentrated sulfuric acid is 0.2%); with FeCl2The addition amount of the oxidation auxiliary agent is 0.03 percent, and the addition amount of the sodium dodecyl sulfate is 0.15 percent; sodium metasilicate and sodium tripolyphosphate are used as dispersing agents, and the adding amount is 0.1% (the adding amount of the sodium metasilicate is 0.08%, and the adding amount of the sodium tripolyphosphate is 0.02%); the extraction agent and the oily sludge are carried out according to the steps with the mass ratio of 0.5:1, and the oily sludge oil is treatedThe content is 0.11 percent, and the oil removal rate is 99.40 percent.
Example 12
The method is characterized in that a test is carried out by taking oily sludge (oil content is 41.4% and water content is 55.6%) of a dirty oil pool of a certain petrochemical company as a raw material, and potassium permanganate and concentrated sulfuric acid are taken as oxidants, wherein the addition amount of the potassium permanganate is 0.03%, and the addition amount of the concentrated sulfuric acid is 0.01%; with FeCl2And Fe2O3The addition amount of the oxidation auxiliary agent is 0.03 percent (FeCl)2The addition amount is 0.01 percent and Fe2O3The addition amount is 0.02%), dodecyl trimethyl ammonium bromide is a surfactant, and the addition amount is 0.05%; the addition amount of the sodium tripolyphosphate is 0.1 percent; the extraction agent and the oily sludge are carried out according to the steps according to the mass ratio of 0.6:1, the oil content of the oily sludge after treatment is 0.22%, and the oil removal rate is 99.46%.
The embodiments described above are only a part of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Claims (5)
1. A harmless recycling oily sludge treatment system comprises an oxidation extraction system (1), an extraction solvent generation system (2) and a sludge drying system (3); the oxidation extraction system (1) is communicated with the sludge drying system (3), the sludge drying system (3) is communicated with the extraction solvent generation system (2), and the oxidation extraction system (1) is communicated with the extraction solvent generation system (2), which is characterized in that: a liquid phase outlet (11) of a three-phase separator of the oxidation extraction system is connected with an oil-water separator (14) of the extraction solvent generation system, a solid phase outlet of a two-phase separator (18) of the oxidation extraction system is connected with a screw conveyor (27) of the sludge drying system, the screw conveyor (27) is connected with drying equipment (20), and a liquid phase outlet of the two-phase separator (18) is connected with the oil-water separator (14) of the extraction solvent generation system; a condenser (19) of the sludge drying system is connected with a solid phase oil removal stirring tank (12) of the oxidation extraction system; the light component outlet of a solvent generating tower (15) of the extraction solvent generating system is respectively connected with a solid phase oil removing stirring tank (12) and a heavy phase oil removing stirring tank (13) of the oxidation extraction system.
2. The harmless resource treatment oil-containing sludge system according to claim 1, wherein the oxidation extraction system: an oily sludge pipeline (4) is connected with an oily sludge conditioning tank (5), the oily sludge conditioning tank (5) is provided with a stirring device and is connected with an oxidizing agent feeding pump (7), a mixed liquid outlet of the oily sludge conditioning tank (5) is connected with an oily sludge conditioning tank output pump (24), an outlet of the oily sludge conditioning tank output pump (24) is connected with a three-phase separator (6), a solid phase outlet (9) of the three-phase separator is connected with a solid phase oil removing stirring tank (12), a heavy phase outlet (10) of the three-phase separator is connected with a heavy phase oil removing stirring tank (13), and a liquid phase outlet (11) of the three-phase separator is connected with an oil-water separator (14) of an extraction solvent generation system;
a material outlet of the solid phase oil removal stirring tank (12) is connected with a discharge pump (25) of the solid phase oil removal stirring tank, and an outlet of the discharge pump (25) of the solid phase oil removal stirring tank is connected with the two-phase separator (18); the material outlet of the heavy phase oil removal stirring tank (13) is connected with a discharge pump (26) of the heavy phase oil removal stirring tank, the outlet of the discharge pump (26) of the heavy phase oil removal stirring tank is connected with a two-phase separator (18), the solid phase outlet of the two-phase separator (18) is connected with a screw conveyor (27), the screw conveyor (27) is connected with drying equipment (20) of a sludge drying system, and the liquid phase outlet of the two-phase separator (18) is connected with an oil-water separator (14) of an extraction solvent generation system.
3. The system for harmless resource treatment of oily sludge according to claim 1, which is characterized in that the sludge drying system comprises: the solid phase screw conveyor (27) connected with the two-phase separator (18) of the oxidation extraction system is connected with the drying device (20), the gas phase outlet of the drying device (20) is connected with the condenser (19), the condenser (19) is connected with the solid phase oil removing stirring tank (12) of the oxidation extraction system, and the drying device is provided with a solid phase outlet (21).
4. The harmless resource treatment oil-containing sludge system according to claim 1, characterized in that the extraction solvent generation system: the water phase outlet of the oil-water separator (14) is connected with a sewage treatment device (22), the oil phase outlet is connected with a crude oil tank (17), the crude oil tank (17) is provided with a crude oil tank delivery pump (28), the outlet of the crude oil tank delivery pump (28) is connected with a solvent generation tower (15), the light component outlet of the solvent generation tower (15) is respectively connected with a solid phase oil removal stirring tank (12) and a heavy phase oil removal stirring tank (13), and the residual component outlet of the solvent generation tower (15) is connected with a heat exchanger (16).
5. The system for harmless resource treatment of oily sludge according to claim 4, wherein the solvent generation tower (15) is composed of an atmospheric tower and/or a vacuum tower.
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Address after: 414012 Lu Kou Zhen Chang Lian Long Kou, Yunxi District, Yueyang City, Hunan Province (opposite to Chang Lian hospital) Patentee after: Hunan Changlian New Material Technology Co.,Ltd. Address before: 414000 Changlian Longkou, Lukou Town, Yunxi District, Yueyang City, Hunan Province (opposite to Changlian hospital) Patentee before: HUNAN CHANGLING PETROCHEMICAL TECHNOLOGY DEVELOPMENT Co.,Ltd. |