Multi-stage reduction oil sludge treatment system

Abstract

The utility model discloses a multi-stage reduction oil sludge treatment system which comprises a grating separation pretreatment unit, a heating fluidization pretreatment unit, a fine screening pretreatment unit and a tempering feeding pretreatment unit, and a first material conveying device is arranged between the grating separation pretreatment unit and the heating fluidization pretreatment unit; a second conveying device is arranged in the heating fluidization pretreatment unit, the fine screening pretreatment unit is located on the upper portion of the tempering and feeding pretreatment unit, and a third conveying device is arranged between the tempering and feeding pretreatment unit and the core treatment equipment; according to the utility model, the purposes of high-efficiency and refined pretreatment are achieved by grading and classifying pretreatment on the basis of particle sizes, physical and chemical properties and the like of oil sludge and sundries.

Description

Technical Field

[0001] The utility model relates to the field of oil sludge treatment, in particular to a multi-stage reduction oil sludge treatment system. Background Art

[0002] At present, the core technologies mainly used for oil sludge in the oil and gas field are pyrolysis desorption, hot water washing, pyrolysis carbonization, etc. The above technologies are used to pre-treat the incoming oil sludge by sorting, removing large-particle bricks, gravel, woven bags and other debris, and then pass through the core processing equipment for pyrolysis desorption, hot water washing, pyrolysis carbonization and other treatments. After the treatment, the tailings that meet the requirements can be used as industrial production raw materials or for paving oil and gas field well site roads, realizing the harmless and resource-based disposal of oil-containing sludge.

[0003] At present, the oily sludge generated during the production process of oil and gas fields has the characteristics of "large amount of oily sludge, high oil content, and complex composition". Directly adopting the above-mentioned "sorting pretreatment + core treatment" has the following disadvantages: (1) Only sorting pretreatment is performed at the front end to remove large-particle bricks, gravel, woven bags and other debris, with a low degree of reduction and a high operating load on subsequent equipment. This places higher requirements on the equipment, and the on-site operation and management are still very difficult; (2) It leads to large investment in oily sludge disposal and high environmental risks, and at the same time does not conform to environmental protection concepts such as "carbon reduction and emission reduction", "reduction", and "green sustainability"; (3) The amount of tailings after treatment is large, and the amount and cost of outsourced disposal at the back end are large. Utility Model Content

[0004] In view of the problems existing in the prior art, the utility model proposes a multi-stage reduction sludge disposal system, which is composed of a multi-stage pretreatment unit. The incoming sludge is graded and classified for pretreatment to achieve the purpose of efficient and refined pretreatment. The reduction degree is high, which can significantly reduce the operating load and tailings amount of subsequent core equipment, has low processing costs and can extend the service life of the core equipment.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model proposes a multi-stage reduced sludge disposal system, comprising a grid sorting pretreatment unit, a heating fluidization pretreatment unit, a fine screening pretreatment unit and a tempering and feeding pretreatment unit, wherein a first feeding device is arranged between the grid sorting pretreatment unit and the heating fluidization pretreatment unit, a second feeding device is arranged in the heating fluidization pretreatment unit, and the fine screening pretreatment unit is located on the upper part of the tempering and feeding pretreatment unit.

[0007] Preferably, the grid sorting pretreatment unit comprises an oil sludge pool and a grid, and the grid is arranged at the upper end of the oil sludge pool.

[0008] Preferably, the heated fluidized pretreatment unit includes a fluidized pool, and a heating device and an oil guide groove are arranged on the side wall of the fluidized pool, one end of the oil guide groove is connected to the inside of the fluidized pool, and the other end is connected to the collecting device, the first stirring device is hung on the upper part of the fluidized pool through a lifting bracket, the second feeding device is fixed to the inner wall of the fluidized pool through a lifting pump frame, the second feeding device and the lifting pump frame are connected by a guide chain, and an oil scraping device is also arranged on the upper end of the fluidized pool.

[0009] Preferably, the heating device comprises an internal heating coil, and several groups of internal heating coils are connected in parallel. The internal heating coils are attached to the inner wall of the fluidizing pool, the inlet end is connected to the steam main pipeline, and the outlet end passes through the side wall of the fluidizing pool.

[0010] Preferably, the oil scraping device includes a scraper, both ends of which are connected to chains, and the chains at both ends of the scraper are respectively set at the upper ends of two opposite side walls of the fluidizing tank through reducers, and the two opposite side walls are respectively located on both sides of the oil guide groove.

[0011] Preferably, the collecting device is a collecting box.

[0012] Preferably, the inlet end of the internal heating coil is arranged at the upper end of the internal heating coil, and the outlet end is arranged at the lower end of the internal heating coil.

[0013] Preferably, the oil guide groove is conical, and the narrow end is connected to the fluidizing tank.

[0014] Preferably, the fine screening pretreatment unit includes a vibrating screen, the tempering and feeding pretreatment unit includes a tempering and feeding tank and a second stirring device, the vibrating screen is arranged at the upper end of the tempering and feeding tank, and the second stirring device is hung on the upper part of the tempering and feeding tank through a bracket.

[0015] Preferably, the first feeding device and the second feeding device are both slurry pumps.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] (1) The oil sludge treatment system of the utility model is composed of a multi-stage pretreatment unit, which performs graded and classified pretreatment based on the particle size, physical and chemical properties of the oil sludge and debris, so as to achieve the purpose of efficient and refined pretreatment;

[0018] (2) This practical multi-stage pretreatment unit can not only achieve the reduction of sludge disposal, but also make the material in a homogeneous state, improve and enhance its fluidity, reduce the investment and load of sludge transportation and feeding facilities, and simplify the on-site treatment process;

[0019] (3) The main body of the multi-stage pretreatment and reduction system of the utility model adopts the construction method of "underground pool body and above-ground equipment", which greatly reduces the occupied area. At the same time, the equipment used is a combination and integrated optimization of conventional equipment. There is no need for high-precision equipment or equipment imported from abroad. The overall construction investment and operating costs are low. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 This is a schematic diagram of the overall structure of the oil sludge disposal system of the utility model;

[0022] Figure numerals: 1. Grid sorting pretreatment unit, 101. Oil sludge pool, 102. Grid, 2. Heating fluidization pretreatment unit, 201. Fluidization pool, 202. Oil guide trough, 203. Collecting device, 204. First stirring device, 205. Oil scraping device, 3. Connecting arm, 301. Roller, 302. Reducer motor, 4. First feeding device, 5. Second feeding device, 6. Third feeding device, 7. Core processing equipment, 8. Vibrating screen, 9. Oil sludge transport vehicle. DETAILED DESCRIPTION

[0023] The implementation scheme of the utility model will be described in detail below with reference to examples, but those skilled in the art will understand that the following examples are only used to illustrate the utility model and should not be regarded as limiting the scope of the utility model.

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0025] The following description sets forth specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0026] refer to Figure 1The present embodiment proposes a multi-stage reduced sludge disposal system, comprising a grid sorting pretreatment unit 1, a heating fluidization pretreatment unit 2, a fine screening pretreatment unit and a tempering and feeding pretreatment unit 3, wherein a first feeding device 4 is arranged between the grid sorting pretreatment unit 1 and the heating fluidization pretreatment unit 2, a second feeding device 5 is arranged at the upper end of the heating fluidization pretreatment unit 2, the fine screening pretreatment unit is located at the upper part of the tempering and feeding pretreatment unit 3, and a third feeding device 6 is arranged between the tempering and feeding pretreatment unit 3 and the core processing equipment 7.

[0027] In this embodiment, the incoming sludge needs to be strictly followed in sequence to pass through the grid sorting pretreatment unit 1, the heating fluidization pretreatment unit 2, the fine screening pretreatment unit, and the conditioning and feeding pretreatment unit 3 for multi-stage pretreatment, that is, the incoming material first enters the sorting pretreatment unit 1, and the sludge after removing large particles of impurities enters the heating fluidization unit 2 through the first feeding device 4, removes part of the dirty oil in the sludge, and improves the fluidity of the sludge. After that, it enters the fine screening unit through the second feeding device 5 to further remove small particles of impurities. The fine screening pretreatment unit is located in the conditioning and feeding pretreatment unit. At the upper part of unit 3, the sludge treated by the fine screening unit directly enters the tempering and feeding pretreatment unit 3 under the action of gravity, so that the material is completely homogenized, further improving and enhancing the fluidity of the material. The sludge treated by the tempering and feeding pretreatment unit 3 enters the core processing equipment 7 through the third transportation device 6. This embodiment performs classification and classification pretreatment on the incoming sludge through multi-stage pretreatment to achieve the purpose of efficient and refined pretreatment, with a high degree of reduction, which can significantly reduce the operating load and tailings amount of subsequent core equipment, with low processing cost and can extend the service life of the core equipment.

[0028] Preferably, the grid sorting pretreatment unit 1 includes an oil sludge pool and a grid 101, the grid 101 is arranged at the upper end of the oil sludge pool 102, the heating fluidization pretreatment unit 2 includes a fluidization pool 201, a heating device and an oil guide groove 202 are arranged on the side wall of the fluidization pool 201, one end of the oil guide groove 202 is connected to the inside of the fluidization pool 201, and the other end is connected to the collecting device 203, the first stirring device 204 is hung on the upper part of the fluidization pool 201 through a lifting bracket, and the second feeding device 5 is connected to the collecting device 203. The lifting pump frame is fixed on the inner wall of the fluidized pool 201, and the second feeding device 5 is connected by a guide chain between the lifting pump frames to facilitate inspection and maintenance. An oil scraper 205 is also provided at the upper end of the fluidized pool 201. The fine screening pretreatment unit includes a vibrating screen 8, and the tempering and feeding pretreatment unit 3 includes a tempering and feeding pool 301 and a second stirring device 302. The vibrating screen 8 is arranged on the upper side of the tempering and feeding pool 301, and the second stirring device 302 is hung on the upper part of the tempering and feeding pool 301 through a bracket.

[0029] In this embodiment, the sludge pool 101, the fluidized pool 201 and the tempering and feeding pool 301 are all designed according to the sludge processing capacity. The pool bodies are all cast with a "steel-concrete" structure. The pool body needs to be able to withstand the load generated by the upper vehicle and the sludge loading; the material of the grid 102 is preferably a galvanized steel grid plate with a steel thickness of 5 mm, a flat steel width of 25 mm, and a mesh of 20 mm × 20 mm square holes. After the sludge transport vehicle 9 enters the workshop, the material is directly unloaded onto the grid 102. Through the sorting function of the grid 102, large particles of impurities (bricks, etc.) in the sludge and sludge packaging bags, anti-seepage The film, oil-absorbing felt and other debris are intercepted on the top of the grid 102 to form the screen material, and the screen material is finally collected in the screen material storage pool. The screen material sludge falls into the sludge pool 101 by its own weight. The feed pipe of the first feeding device 4 is extended to the bottom of the sludge pool 1. The outlet of the first feeding device 4 is set at the upper end of the fluidized pool 201. The sludge in the sludge pool 101 is transported to the fluidized pool 201 through the first feeding device 4, so that the surface of the sludge in the fluidized pool 101 is slightly lower than the height of the oil guide groove 202. The heating device is turned on to heat the material in the pool to 50-6 0℃, and then the first stirring device 4 is continuously stirred to separate the oil in the material and float it on the surface, thereby reducing the load of the rear-end sludge treatment and achieving the purpose of reducing the amount of material. At the same time, the material can be in a homogeneous state and the fluidity is greatly increased. After the material in the fluidized pool 101 is stirred evenly, the stirring device is raised by the lifting bracket without affecting the oil scraping process. The oil on the surface of the material in the fluidized pool 201 is scraped to the oil guide groove 202 by the oil scraping device 205, and the oil is collected to the collection device 203 for centralized treatment through the oil guide groove 202. The feeding pipe of the second feeding device 5 extends into the fluidized pool 2 01, the outlet end of the discharge pipe is arranged at the upper end of the vibrating screen 8, and the pretreated material in the fluidizing tank 201 is transported to the vibrating screen 8 through the second feeding device 5 for screening, and the screened material falls into the tempering and feeding tank 301 in the next pretreatment unit. At this time, the particle size of the sludge in the screened material is within 5 mm, and the second stirring device 5 is turned on to stir the material in the tempering and feeding tank 301 to homogenize the sludge, further improve and enhance the fluidity of the sludge. After the stirring is completed, the material in the tempering and feeding tank 301 is sent to the core processing equipment 7 through the third feeding device 6 for back-end disposal.

[0030] Preferably, the heating device includes an internal heating coil, several groups of internal heating coils are connected in parallel, the internal heating coils are attached to the inner wall of the fluidizing pool 201, the inlet end is located at the upper end of the internal heating coil and is connected to the steam main pipeline, and the outlet end is located at the lower end of the internal heating coil and passes through the side wall of the fluidizing pool 201.

[0031] In this embodiment, the heating device adopts an internal heating coil. The heating coil adopts stainless steel 316L seamless pipe or welded pipe as raw material. The heating medium is preferably steam. To avoid water hammer or blockage, steam is introduced from the upper end and condensate is discharged from the lower end. The installation method is to use several groups of coils in parallel to solve the problem that the heating coil is too long, which will increase fluid resistance and consume too much energy. Improve the smoothness of the condensation and circulation loop; to prevent the pressure drop of the coil from being too large, the pipe diameter is in the range of DN25 to 65, and the flow rate in the pipe is limited to 0.3 to 0.8 m / s. For gas, the mass flow rate can be controlled at 3 to 10 kg / (m 2 .s); The characteristics of the internal heating coil are simple structure, low cost, easy operation and management, the tube can withstand high pressure, flexible installation, can adapt to the shape of the container, be bent into a cylindrical or flat shape, etc., can also be connected in parallel in several groups to increase the heat transfer area, and even two independent groups of coils can be used in the same equipment, and different heat carriers can be introduced to make full use of the heat.

[0032] Preferably, the oil guide groove 202 is conical, and the narrow end is connected to the fluidizing pool 201, and the oil guide groove 202 is narrow to wide during the oil guide process, so as to ensure that the oil does not overflow.

[0033] Preferably, the oil scraping device 205 includes a scraper, both ends of which are connected to chains, and the chains at both ends of the scraper are respectively set at the upper ends of two opposite side walls of the fluidizing tank through reducers, and the two opposite side walls are respectively located on both sides of the oil guide groove.

[0034] In this embodiment, both ends of the chain on each side are respectively wound around the reducer. When stirring the material in the fluidized bed, the reducer at one end of the chains on both sides is opened to move the scraper to one end of the fluidized bed without affecting the stirring process of the first stirring device. The first stirring device is then lowered by the lifting bracket. After the stirring is completed, the first stirring device is raised by the lifting bracket without affecting the scraping of the oil by the scraper. The scraper is controlled to scrape the oil by controlling the reducers at both ends of the chain.

[0035] In the above embodiments, the first feeding device 4, the second feeding device 5 and the third feeding device 6 are preferably slurry pumps, and the pump body has a stirring function. The specifications of the first feeding device 4 are preferably a flow rate of 60-80m3 / h, a power of 22kw, and a head of 20-30m. The specifications of the second feeding device 5 and the third feeding device 6 are preferably a flow rate of 30-40m3 / h, a power of 11kw, and a head of 20-30m; the first stirring device 204 and the second stirring device 302 are preferably carbon steel anti-corrosion agitators.

[0036] In the above embodiments, the oversize material on the grille 102 and the oversize material on the vibrating screen 8 can be manually removed to the oversize material storage pool, and can also be removed to the oversize material storage pool by a crane grab. The crane grab is composed of a lower foundation, guide rails, grab arms, grabs and a hydraulic system. A mature and conventional electric hydraulic three-petal grab is adopted. The lower guide rail of the crane grab radiates the entire reduced sludge disposal system area, and the guide rails move to realize one grab and multiple units sharing. In order to remove the oversize material on the vibrating screen 8 in time, the vibrating screen 8 can also be tilted so that the oversize material naturally falls into the oversize material storage pool under the action of vibration, and is assisted by manual cleaning when the vibrating screen stops working.

[0037] Although the utility model has been described in detail in this specification with general descriptions and specific implementation schemes, it is obvious to those skilled in the art that some modifications or improvements can be made to the utility model based on the utility model. Therefore, these modifications or improvements made without departing from the utility model are within the scope of protection claimed by the utility model.

Claims

1. A multi-stage reduction sludge treatment system, characterized in that: The invention comprises a grid sorting pretreatment unit (1), a heating fluidized pretreatment unit (2), a fine screening pretreatment unit and a tempering and feeding pretreatment unit (3); a first feeding device (4) is arranged between the grid sorting pretreatment unit (1) and the heating fluidized pretreatment unit (2); a second feeding device (5) is arranged in the heating fluidized pretreatment unit (2); and the fine screening pretreatment unit is located on the upper part of the tempering and feeding pretreatment unit (3).

2. A multi-stage reduction sludge treatment system according to claim 1, characterized in that: The grid sorting pretreatment unit (1) comprises an oil sludge pool (101) and a grid (102), wherein the grid (102) is arranged at the upper end of the oil sludge pool (101).

3. A multi-stage reduction sludge treatment system according to claim 1, characterized in that: The heating fluidized pretreatment unit (2) comprises a fluidized pool (201), a heating device and an oil guide groove (202) are arranged on the side wall of the fluidized pool (201), one end of the oil guide groove (202) is connected to the inside of the fluidized pool (201), and the other end is connected to the collecting device (203), a first stirring device (204) is hung on the upper part of the fluidized pool (201) through a lifting bracket, a second feeding device (5) is fixed to the inner wall of the fluidized pool (201) through a lifting pump frame, the second feeding device (5) and the lifting pump frame are connected by a guide chain, and an oil scraping device (205) is also arranged on the upper end of the fluidized pool (201).

4. A multi-stage reduction sludge treatment system according to claim 3, characterized in that: The heating device comprises an internal heating coil, wherein a plurality of groups of internal heating coils are connected in parallel, the internal heating coils are attached to the inner wall of the fluidizing pool (201), the inlet end of the internal heating coils is connected to the steam main pipeline, and the outlet end of the internal heating coils passes through the side wall of the fluidizing pool (201).

5. A multi-stage reduction sludge treatment system according to claim 3, characterized in that: The oil scraping device (205) comprises a scraper, both ends of which are connected to chains, and the chains at both ends of the scraper are respectively arranged at the upper ends of two opposite side walls of the fluidizing tank through reducers, and the two opposite side walls are respectively located on both sides of the oil guide groove (202).

6. A multi-stage reduction sludge treatment system according to claim 3, characterized in that: The collecting device (203) is a collecting box.

7. A multi-stage reduction sludge treatment system according to claim 4, characterized in that: The inlet end of the internal heating coil is arranged at the upper end of the internal heating coil, and the outlet end is arranged at the lower end of the internal heating coil.

8. The multi-stage reduction sludge treatment system according to claim 5, characterized in that: The oil guide groove (202) is conical, and the narrow end is connected to the fluidizing tank (201).

9. The multi-stage reduction sludge treatment system according to claim 1, characterized in that: The fine screening pretreatment unit comprises a vibrating screen (8), the tempering and feeding pretreatment unit (3) comprises a tempering and feeding tank (301) and a second stirring device (302), the vibrating screen (8) is arranged at the upper end of the tempering and feeding tank (301), and the second stirring device (302) is hung on the upper part of the tempering and feeding tank (301) through a bracket.

10. The multi-stage reduction sludge treatment system according to claim 1, characterized in that: The first material conveying device (4) and the second material conveying device (5) are both slurry pumps.

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