Resource recycling treatment method and system for oily sludge

Abstract

The invention relates to the technical field of oily sludge treatment, and particularly discloses a resource recycling treatment method and system for oily sludge. The method comprises the following steps: removing impurities from the oily sludge by adopting a multi-stage pretreatment device; the multi-stage fluidization tempering device is used for changing the fluidity of the material to obtain a pretreated material; carrying out chemical hot water washing treatment on the pretreated material twice; adding a purification agent into an oil-water separator, heating and stirring the primary oil-water mixture and the secondary oil-water mixture, and dehydrating and removing impurities to obtain an oil product; carrying out drying treatment on the solid-phase substance subjected to two times of chemical hot water washing to obtain waste gas and dry hot washing slag; the hot washing slag is added into a hot washing slag thermal desorption device to obtain oil sludge slag and tail gas, and the tail gas enters tail gas treatment equipment and a non-condensable gas treatment device to be treated. According to the method, the oil recovery rate of the oily sludge is increased, meanwhile, thorough resource utilization of the tail-end pyrolysis residues is achieved, and the treatment effect and the resource recovery efficiency of the oily sludge are improved.

Description

Technical Field

[0001] The invention relates to the technical field of oily sludge treatment, and in particular to a resource recovery and treatment system for oily sludge. Background Art

[0002] Oily sludge is one of the oily solid pollutants produced during crude oil extraction, oil refining and transportation, and sewage treatment. The amount of oily sludge produced accounts for about 3% of the total amount of crude oil and natural gas extraction. 3% of the total amount of oil refining. Because some hydrocarbon substances contained in oily sludge contain a large number of pathogens, parasites (eggs), heavy metals such as copper, zinc, chromium, mercury, salts, and PCBs, dioxins, radionuclides and other toxic and harmful substances that are difficult to degrade, oily sludge has been classified as hazardous solid waste (HW08) for management. How to make harmless and resource-based use of oily sludge is an important environmental protection issue to be solved.

[0003] At present, the following methods are usually used to recycle oily sludge: thermal chemical cleaning. However, if only thermal chemical cleaning is used, the oily sludge after cleaning still has a high residual oil content and cannot meet the standards for direct discharge or utilization. The solvent extraction method will leave some oil and solvent in the sludge, and the treatment is not thorough. In addition, the amount of extractant used is large and the cost is high, which affects the treatment effect of oily sludge and the efficiency of resource recovery. Summary of the invention

[0004] In order to overcome the deficiencies of the prior art, the object of the present invention is to provide a method and system for resource recovery of oily sludge, so as to improve the treatment effect of oily sludge and the resource recovery efficiency.

[0005] The technical solution adopted by the present invention is:

[0006] A method for recycling and treating oily sludge, comprising the following steps:

[0007] A multi-stage pre-treatment device is used to stir and crush the oily sludge and separate the oil sludge. The material with floating debris and sand and gravel removed enters the multi-stage fluidization conditioning device to fluidize and homogenize the material, change the fluidity of the material, and obtain the pre-treated material;

[0008] The pretreated material is subjected to a chemical hot water washing treatment to separate a primary oil-water mixture and a primary solid phase material, and the primary solid phase material is subjected to a secondary chemical hot water washing treatment to separate a secondary oil-water mixture and a secondary solid phase material;

[0009] Adding a purification agent into the oil-water separator to heat, stir, dehydrate and remove impurities from the primary oil-water mixture and the secondary oil-water mixture to obtain an oil product, wherein the water content of the oil product is less than 2%, the ash content is less than 1%, and the oil product recovery rate is greater than 98%;

[0010] The secondary solid phase material from the two-stage chemical hot water washing is added to the drying equipment for heating and drying to obtain waste gas and dry hot washing residue;

[0011] The dried hot washed slag is added to the hot washed slag thermal desorption device for treatment for 30-60 minutes to obtain oil sludge and tail gas, and the tail gas enters the tail gas treatment equipment and the non-condensable gas treatment device for treatment.

[0012] The present invention uses a multi-stage pretreatment device to remove large suspended particles and impurities, fine sand, filaments, etc. in the oily sludge, a multi-stage fluidized conditioning device to fluidize and homogenize the oily sludge, a multi-stage chemical hot water washing device to remove petroleum substances attached to the surface of the oily sludge, an oil purification device to remove excess water and mechanical impurities in the oil, and a hot washing residue thermal desorption device to reduce the oil content in the oily sludge residue to less than 0.3%. The obtained oily sludge residue can be used as a raw material for the downstream production of green high-strength lightweight aggregates. The tail gas treatment device removes nitrogen oxides, acidic substances, particulate matter, etc. in the tail gas, and finally meets the emission standards. The present invention improves the oil recovery rate of the oily sludge and realizes thorough resource utilization of the terminal pyrolysis residue through the use of building materials.

[0013] Optionally, the multi-stage pre-treatment device includes a first storage tank, a first overflow grid, a second storage tank, a second overflow grid and a screening and sand removal device. The oily sludge passes through the first overflow grid in the first storage tank to filter floating debris and then enters the second storage tank. It passes through the second overflow grid to remove fine filaments and then enters the feeding tank. The grid spacing of the first overflow grid is 3-5cm, and the grid spacing of the second overflow grid is 1-5mm. A heating steam coil is arranged at the bottom of the feeding tank to enhance the fluidity of the oily sludge. A lifting pump is arranged at the top of the feeding tank. The lifting pump lifts the oily sludge into the screening and sand removal device. A linear vibrating screen with a mesh size of less than 1mm is arranged at the inlet of the screening and sand removal device to remove fine filaments and sand and gravel. The screened material enters the sand removal box for solid-liquid separation. The upper layer of liquid in the sand removal box enters the first-level conditioning tank through the lifting pump for the last fluidization modulation to obtain the pretreated material.

[0014] Optionally, the pretreated material is stirred and mixed with a primary agent in a primary conditioning tank for a thermal chemical water washing, the primary conditioning tank is heated by steam at 45-70° C., and the primary agent is a mixture of one or more of a demulsifier, a viscosity reducer, a cleaning agent and a flocculant;

[0015] The mass ratio of the primary reagent to the pre-treated material is:

[0016] Demulsifier 0.01-1wt%, viscosity reducer 0.1-0.5wt%, cleaning agent 0.1-0.5wt% and flocculant 0.001-0.5wt%.

[0017] Optionally, the material obtained after the first thermochemical water washing enters a three-phase centrifuge to separate a first oil-water mixture and a first solid phase material, and the first solid phase material enters a second conditioning box through a feeding screw device and is stirred and mixed with a second reagent for a second chemical hot water washing, and the second conditioning box is heated by steam at 45-55° C., and the second reagent is a mixture of two or more of a demulsifier, a viscosity reducer, a cleaning agent and a flocculant;

[0018] The mass ratio of the secondary reagent to the pre-treated material is:

[0019] Demulsifier 0.01-0.2wt%, viscosity reducer 0.05-0.1wt%, cleaning agent 0.05-0.2wt% and flocculant 0.001-0.5wt%.

[0020] Optionally, the stirring time of the first-stage thermochemical water washing is 0.5-2 hours, and the mixture is allowed to stand for 2-6 hours after stirring; the stirring time of the second-stage thermochemical water washing is 0.5-2 hours, and the mixture is allowed to stand for 2-6 hours after stirring.

[0021] Optionally, the oil-water separator includes a primary tank and a secondary tank. The primary oil-water mixture and the secondary oil-water mixture are stirred with a purification agent in the primary tank for 0.5-1h. The upper liquid in the primary tank is buffered in the secondary tank and then enters a butterfly centrifuge for dehydration and impurity removal. The temperature in the primary tank is 45-55°C.

[0022] Optionally, the moisture content of the hot washed slag after drying is 30-35%, and the hot washed slag enters the hot washed slag thermal desorption device through a feed screw; a dividing screw is provided on the feed screw, and when the hot washed slag thermal desorption device fails, the dried hot washed slag is promptly diverted and temporarily stored; the temperature of the hot washed slag thermal desorption device is 500-600°C, the reaction time is 30-60min, and oil sludge slag with an oil content of less than 0.3% is obtained.

[0023] Optionally, after passing through the heat exchanger, the exhaust gas passes through a cooling unit, a denitrification unit and a desulfurization unit in sequence to remove nitrogen oxides, acidic substances and particulate matter in the exhaust gas.

[0024] A resource recovery and treatment system for oily sludge, comprising:

[0025] Multi-stage pre-treatment device for removing impurities from oily sludge;

[0026] Multi-stage fluidized conditioning device, used to change the fluidity of oily sludge to obtain pre-treated materials;

[0027] A multi-stage chemical hot water washing device, connected to a multi-stage pre-treatment device, is used to remove petroleum substances attached to the surface of the material to be treated and to perform solid-liquid separation on the oily sludge;

[0028] Oil purification device, which purifies the liquid phase after multi-stage chemical hot water washing to reduce the water content and ash content of the oil;

[0029] The hot-wash slag thermal desorption device is used to render the solid phase obtained after two-stage chemical hot water washing harmless and obtain oil sludge slag with an oil content of less than 0.3%;

[0030] Tail gas treatment device, including cooling unit, denitrification unit and desulfurization unit, to remove nitrogen oxides, acidic substances and particulate matter in tail gas;

[0031] The oil sludge resource utilization device is used to mix the oil sludge, granulate it, dry it, burn it, and cool it to obtain a cylinder pressure strength of 6-8MPa and a bulk density of 500-800kg / m 3 High strength lightweight aggregate.

[0032] The beneficial effects of the present invention are as follows: the present invention reduces the oil content in the oily sludge to below 0.3% through a multi-stage pretreatment device, a multi-stage fluidized conditioning device, a multi-stage chemical hot water washing device, an oil purification device and a hot washing slag thermal desorption device, and the oil recovery rate reaches more than 98%. The pyrolysis slag is used as a raw material for the downstream production of green high-strength lightweight aggregate to remove nitrogen oxides, acidic substances, particulate matter, etc. in the tail gas, and finally meets the emission standards; while improving the oil recovery rate of the oily sludge, the present invention realizes thorough resource utilization of the terminal pyrolysis slag through the use of building materials, thereby improving the treatment effect of the oily sludge and the resource recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a system flow chart of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the accompanying drawings in the embodiments of the present invention to illustrate the technical solutions in the embodiments of the present invention clearly and completely, taking the right leg as an example. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] This embodiment provides the following technical solutions:

[0036] A method for recycling and treating oily sludge, comprising the following steps:

[0037] A multi-stage pre-treatment device is used to stir and crush the oily sludge and separate the oil sludge. The material with floating debris and sand removed enters the multi-stage fluidization conditioning device to fluidize and homogenize the material, change the fluidity of the material, and obtain the pre-treated material;

[0038] The pretreated material is subjected to a chemical hot water washing treatment to separate a primary oil-water mixture and a primary solid phase material. The primary solid phase material is subjected to a secondary chemical hot water washing treatment at 45-55°C to obtain a secondary oil-water mixture and a secondary solid phase material; the wet basis oil content of the primary solid phase material is 3%-6%, and the wet basis oil content of the secondary solid phase material is less than 2%.

[0039] 0.1-0.5% of purification agent is added to the oil-water separator to heat, stir, dehydrate and remove impurities of the primary oil-water mixture and the secondary oil-water mixture to obtain an oil product with a water content of less than 2% and an ash content of less than 1%; the oil product recovery rate is greater than 98%.

[0040] The primary solid phase material and the secondary solid phase material are added to the drying equipment for heating and drying to obtain waste gas and dry hot washing residue;

[0041] The hot washed slag is added to the hot washed slag thermal desorption device for treatment for 30-60 minutes to obtain oily sludge and tail gas, and the tail gas enters the tail gas treatment equipment and the non-condensable gas treatment device for treatment.

[0042] The multi-stage pre-treatment device includes a first storage tank, a first overflow grid, a second storage tank, a second overflow grid and a screening and sand removal device. The oily sludge is divided into tank bottom sludge and high-oil-content ground sludge. The water content of the tank bottom sludge is between 60-80%. The tank bottom sludge is directly added to the first storage tank; the high-oil-content ground sludge is contained in a woven bag, and the woven bag is manually broken and the woven bag and large debris are removed by a sieve with a spacing of 3-5cm. The ground sludge is added to the first storage tank and stirred and mixed with the tank bottom sludge. The oily sludge enters the second storage tank after filtering floating debris through the first overflow grid in the first storage tank, and enters the feeding tank after removing fine filaments through the second overflow grid. The grid spacing of the first overflow grid is 3-5cm, and the grid spacing of the second overflow grid is 1-5mm.

[0043] A heating steam coil is provided at the bottom of the feeding tank to heat the material in the feeding tank to 40-50°C. The fluidity of the oily sludge is enhanced by increasing the temperature. A lifting pump is provided at the top of the feeding tank. The distance between the lifting pump inlet and the tank body of the feeding tank is 50-70cm. The lifting pump lifts the oily sludge to the screening and sand removal device to remove fine filaments and sand and gravel.

[0044] A linear vibrating screen is provided at the entrance of the screening and sand removal device, which is used to remove fine filaments and sand and gravel in the oily sludge. The mesh aperture of the linear vibrating screen is less than 1mm, and the screened material enters the sand removal box for solid-liquid separation. In this embodiment, the sand removal box is arranged in an inverted cone shape; an open overflow baffle with an aperture of 2-3mm is arranged in the sand removal box, and the open overflow plate divides the sand removal box into a first box and a second box. The screened material is deposited in the first box by gravity sedimentation to deposit sand and gravel at the bottom of the first box, and the upper layer of liquid in the first box enters the second box through the open overflow baffle to continue to settle and remove fine sand. The upper layer of liquid in the second box flows into a 50-80 mesh linear vibrating screen through a pipeline to further remove fine impurities to obtain pretreated materials, and the pretreated materials are transported into the primary conditioning tank through a pipeline and a material lifting pump.

[0045] The multi-stage fluidized conditioning device includes a spray device arranged on the linear vibrating screen and a water supply pipeline of the primary conditioning tank. The spray device on the linear vibrating screen cleans the linear vibrating screen to obtain pretreated materials and improve the fluidity of the oily sludge. The flushing frequency is 1-2 times / h, and the flushing time each time is 5-10 minutes. The water supply pipeline on the primary conditioning tank ensures the fluidization state of the material. The spray device sprays water onto the linear vibrating screen, and the water supply pipeline directly injects water into the box from the top of the primary conditioning tank.

[0046] The first-level reagent is added to the top of the first-level conditioning tank through the dosing device. The pretreated material is stirred and mixed with the first-level reagent in the first-level conditioning tank for a thermal chemical water washing to enhance the mass transfer effect. Among them, the first-level conditioning tank is heated by steam at 45-70℃ through the built-in heating coil, and the surface tension of the oil attached to the surface of the pretreated material is reduced by heating, which is convenient for oil removal.

[0047] In addition, the primary reagent is a mixture of one or more of a demulsifier, a viscosity reducer, a cleaning agent and a flocculant. The mass ratio of the primary reagent to the pretreated material is: 0.01-1wt% of demulsifier, 0.1-0.5wt% of viscosity reducer, 0.1-0.5wt% of cleaning agent and 0.001-0.5wt% of flocculant. The stirring time of the primary thermochemical water washing is 0.5-2h. After stirring, it is allowed to stand for 2-6h. The obtained material enters the three-phase centrifuge through the first delivery pump for separation to obtain a primary oil-water mixture and a primary solid phase material.

[0048] The primary solid phase material enters the secondary conditioning box through the feeding screw device and is stirred and mixed with the secondary reagent for secondary chemical hot water washing. The secondary conditioning box is heated by steam at 45-55°C. The secondary reagent is a mixture of two or more of demulsifier, viscosity reducer, cleaning agent and flocculant. The mass ratio of the secondary reagent to the pre-treated material is: demulsifier 0.01-0.2wt%, viscosity reducer 0.05-0.1wt%, cleaning agent 0.05-0.2wt% and flocculant 0.001-0.5wt%. The stirring time of the secondary thermal chemical water washing is 0.5-2h, and it is left to stand for 2-6h after stirring. The obtained material enters the three-phase centrifuge through the second delivery pump to separate into a secondary oil-water mixture and a secondary solid phase material.

[0049] The delivery pipelines of the first delivery pump and the second delivery pump are provided with flocculant pipelines for facilitating centrifugal dehydration; the dosing device comprises a plurality of dosing pipelines connected with the primary conditioning tank and the secondary conditioning tank, and each additive is provided in one-to-one correspondence with the heating pipeline; the wet-based oil content of the oily sludge after two chemical hot water washes is less than 2%, and the oil recovery rate is greater than 98%.

[0050] The oil-water separator comprises a primary box and a secondary box. A heating coil is arranged at the bottom of the primary box. The temperature inside the primary box is 45-55°C. An agitator is arranged at the top of the primary box, a purification agent pipeline is arranged at the middle and upper part, and a wastewater discharge pipeline is arranged at the lower part. The primary oil-water mixture and the secondary oil-water mixture are stirred with the purification agent in the primary box for 0.5-1h. The addition amount of the purification agent is 0.1-0.5%. The purification agent is one of a demulsifier, a reverse demulsifier or a viscosity reducer. The upper liquid in the primary box enters the secondary box for buffering and then enters the butterfly centrifuge for dehydration and impurity removal to obtain hot washed residue and oil products. The water content of the oil products is less than 2%, and the ash content is less than 1%.

[0051] The hot washed slag is transferred to the hot washed slag drying device, which consists of a loading grab, a drying device and a condensing device. The hot washed slag is moved to the material receiving port of the drying device through the loading grab and finally enters the drying device. The drying heat source of the drying device is 165℃, 0.7MPa steam. The moisture content of the hot washed slag after drying is 30-35%. The waste gas generated during the drying process enters the condensing device for treatment.

[0052] The condensing equipment condenses part of the gas in the exhaust gas and carries part of the particles into the generated wastewater through spraying water. The wastewater is regularly discharged to the wastewater treatment station for treatment and reuse; the non-condensable gas that cannot be condensed enters the two-stage demisting tank for dehydration, and then enters the hot slag thermal desorption device for use as fuel after being pressurized by the fan and three-stage demisting. The dried hot slag enters the hot slag thermal desorption device through the feeding screw assembly. The feeding screw is equipped with a dividing screw. When the hot slag thermal desorption device fails, the dried hot slag is promptly diverted and temporarily stored.

[0053] The temperature of the hot-washed slag thermal desorption device is 500-600℃. The dried hot-washed slag is heated for 30-60min to obtain oil sludge slag with an oil content of less than 0.3%. The oil sludge slag can be mixed with other compounds. After mixing, granulation, drying, sintering and cooling of the finished product, the cylinder pressure strength is 6-8MPa and the bulk density is 500-800kg / m 3 The tail gas generated during the hot slag heating process passes through the heat exchanger and then passes through the cooling unit to cool the tail gas temperature to less than 150°C, passes through the denitrification unit, and uses sodium chlorite solution to circulate and spray to absorb nitrogen oxides in the tail gas, and enters the desulfurization unit to use sodium hydroxide solution to circulate and spray to effectively remove NO2 and SO2 in the tail gas, so that the tail gas meets the emission standards.

[0054] A resource recovery and treatment system for oily sludge, comprising:

[0055] Multi-stage pre-treatment device for removing impurities from oily sludge;

[0056] Multi-stage fluidized conditioning device, used to change the fluidity of oily sludge to obtain pre-treated materials;

[0057] A multi-stage chemical hot water washing device, connected to a multi-stage pre-treatment device, is used to remove petroleum substances attached to the surface of the material to be treated and to perform solid-liquid separation on the oily sludge;

[0058] Oil purification device, which purifies the liquid phase after multi-stage chemical hot water washing to reduce the water content and ash content of the oil;

[0059] The hot-wash slag thermal desorption device is used to render the solid phase obtained after multi-stage chemical hot water washing harmless and obtain oil sludge slag with an oil content of less than 0.3%;

[0060] Tail gas treatment device, including cooling unit, denitrification unit and desulfurization unit, to remove nitrogen oxides, acidic substances and particulate matter in tail gas;

[0061] The oil sludge resource utilization device mixes and batches the oil sludge, granulates it, and then sinters it to obtain a cylinder pressure strength of 6-8MPa and a bulk density of 500-800kg / m 3 High strength lightweight aggregate.

[0062] The present invention uses a multi-stage pretreatment device to remove large suspended particles and impurities, fine sand, filaments, etc. in the oily sludge, a multi-stage fluidized conditioning device to fluidize and homogenize the oily sludge, a multi-stage chemical hot water washing device to remove petroleum substances attached to the surface of the oily sludge, an oil purification device to remove excess water and mechanical impurities in the oil, and a hot washing residue thermal desorption device to reduce the oil content in the oily sludge residue to less than 0.3%. The obtained oily sludge residue can be used as a raw material for the downstream production of green high-strength lightweight aggregates. The tail gas treatment device removes nitrogen oxides, acidic substances, particulate matter, etc. in the tail gas, and finally meets the emission standards. While improving the oil recovery rate of the oily sludge, the present invention realizes thorough resource utilization of the terminal pyrolysis residue through the use of building materials, thereby improving the treatment effect of the oily sludge and the resource recovery efficiency.

[0063] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for recycling oily sludge, characterized in that: The following steps are involved: A multi-stage pre-treatment device is used to stir and crush the oily sludge and separate the oil sludge. The material with floating debris and sand and gravel removed enters the multi-stage fluidization conditioning device to fluidize and homogenize the material, change the fluidity of the material, and obtain the pre-treated material; The pretreated material is subjected to a chemical hot water washing treatment to separate a primary oil-water mixture and a primary solid phase material, and the primary solid phase material is subjected to a secondary chemical hot water washing treatment to separate a secondary oil-water mixture and a secondary solid phase material; Adding a purification agent into the oil-water separator to heat, stir, dehydrate and remove impurities from the primary oil-water mixture and the secondary oil-water mixture to obtain an oil product, wherein the water content of the oil product is less than 2%, the ash content is less than 1%, and the oil product recovery rate is greater than 98%; The secondary solid phase material from the two-stage chemical hot water washing is added to the drying equipment for heating and drying to obtain waste gas and dry hot washing residue; The dried hot washed slag is added to a hot washed slag thermal desorption device for treatment for 30-60 minutes to obtain oily sludge and tail gas, and the tail gas enters a tail gas treatment device and a non-condensable gas treatment device for treatment.

2. A resource recovery and treatment method for oily sludge according to claim 1, wherein the multi-stage pre-treatment device comprises a first storage tank, a first overflow grid, a second storage tank, a second overflow grid and a screening and sand removal device, wherein the oily sludge passes through the first overflow grid in the first storage tank to filter floating debris and then enters the second storage tank, and passes through the second overflow grid to remove fine filaments and then enters the feeding tank, the grid spacing of the first overflow grid is 3-5cm, and the grid spacing of the second overflow grid is 1-5mm; a heating steam coil is arranged at the bottom of the feeding tank to enhance the fluidity of the oily sludge, a lifting pump is arranged at the top of the feeding tank, and the lifting pump lifts the oily sludge to the screening and sand removal device, and a linear vibrating screen with a mesh size of less than 1mm is arranged at the inlet of the screening and sand removal device to remove fine filaments and sand and gravel, and the screened material enters the sand removal box for solid-liquid separation, and the upper layer of liquid in the sand removal box enters the first-level conditioning tank through the lifting pump for the last fluidization modulation to obtain the pretreated material.

3. The method for recycling oily sludge according to claim 2, characterized in that: The pre-treated material is stirred and mixed with a primary agent in a primary conditioning tank for a thermal chemical water washing, and the primary conditioning tank is heated by steam at 45-70° C. The primary agent is a mixture of one or more of a demulsifier, a viscosity reducer, a cleaning agent and a flocculant; The mass ratio of the primary reagent to the pre-treated material is: Demulsifier 0.01-1wt%, viscosity reducer 0.1-0.5wt%, cleaning agent 0.1-0.5wt% and flocculant 0.001-0.5wt%.

4. The method for recycling oily sludge according to claim 3, characterized in that: The material obtained after the first thermochemical water washing enters a three-phase centrifuge to separate a first oil-water mixture and a first solid phase material, and the first solid phase material enters a second conditioning box through a feeding screw device and is stirred and mixed with a second reagent for a second chemical hot water washing, and the second conditioning box is heated by steam at 45-55° C., and the second reagent is a mixture of two or more of a demulsifier, a viscosity reducer, a cleaning agent and a flocculant; The mass ratio of the secondary reagent to the pre-treated material is: Demulsifier 0.01-0.2wt%, viscosity reducer 0.05-0.1wt%, cleaning agent 0.05-0.2wt% and flocculant 0.001-0.5wt%.

5. The method for recycling oily sludge according to claim 4, characterized in that: The stirring time of the first-stage thermal chemical water washing is 0.5-2 hours, and the mixture is allowed to stand for 2-6 hours after stirring. The stirring time of the second-stage thermal chemical water washing is 0.5-2 hours, and the mixture is allowed to stand for 2-6 hours after stirring.

6. The method for recycling oily sludge according to claim 4, characterized in that: The oil-water separator includes a primary tank and a secondary tank. The primary oil-water mixture and the secondary oil-water mixture are stirred with a purification agent in the primary tank for 0.5-1h. The upper liquid in the primary tank is buffered in the secondary tank and then enters a butterfly centrifuge for dehydration and impurity removal. The temperature in the primary tank is 45-55°C.

7. The method for recycling oily sludge according to claim 1, characterized in that: The moisture content of the hot washed slag after drying is 30-35%, and the hot washed slag enters the hot washed slag thermal desorption device through a feed screw; a dividing screw is arranged on the feed screw, and when the hot washed slag thermal desorption device fails, the dried hot washed slag is timely diverted and temporarily stored; the temperature of the hot washed slag thermal desorption device is 500-600°C, the reaction time is 30-60min, and an oil sludge slag with an oil content of less than 0.3% is obtained.

8. The method for recycling oily sludge according to claim 1, characterized in that: After passing through the heat exchanger, the tail gas passes through a cooling unit, a denitration unit, and a desulfurization unit in sequence to remove nitrogen oxides, acidic substances, and particulate matter in the tail gas.

9. A resource recovery treatment method system for oily sludge, using the resource recovery treatment method for oily sludge according to any of claims 1 to 8, characterized in that: include: Multi-stage pre-treatment device for removing impurities from oily sludge; Multi-stage fluidized conditioning device, used to change the fluidity of oily sludge to obtain pre-treated materials; A multi-stage chemical hot water washing device, connected to a multi-stage pre-treatment device, is used to remove petroleum substances attached to the surface of the material to be treated and to perform solid-liquid separation on the oily sludge; Oil purification device, which purifies the liquid phase after multi-stage chemical hot water washing to reduce the water content and ash content of the oil; The hot-wash slag thermal desorption device is used to render the solid phase obtained after two-stage chemical hot water washing harmless and obtain oil sludge slag with an oil content of less than 0.3%; Tail gas treatment device, including cooling unit, denitrification unit and desulfurization unit, to remove nitrogen oxides, acidic substances and particulate matter in tail gas; The oil sludge resource utilization device is used to mix the oil sludge, granulate it, dry it, burn it, and cool it to obtain a cylinder pressure strength of 6-8MPa and a bulk density of 500-800kg / m 3 High strength lightweight aggregate.

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