Complete device for treating oil sludge based on hydrodynamic cavitation coupled Fenton-electrochemical treatment

Abstract

The utility model discloses complete equipment for treating oil sludge based on hydrodynamic cavitation coupling Fenton-electrochemical treatment, which comprises a main body unit, the main body unit comprises a homogenizing tank, a first hydrodynamic cavitation reactor, a three-phase centrifugal machine, a sludge digestion tank, a horizontal screw centrifugal machine, an electrolytic reactor, a second hydrodynamic cavitation reactor, a crude oil storage tank, a biogas residue storage tank and a medicament adding device, and a first high-pressure pump is fixedly mounted on the side wall of the homogenizing tank. By utilizing the cavitation effect of hydrodynamic cavitation, efficient demulsification of the oil sludge is realized, and the oil removal rate is increased; oH is generated through cavitation, macromolecules and toxic substances in the oil sludge are degraded, and the anaerobic digestion efficiency is improved; hydrodynamic cavitation is coupled with Fenton-electrochemistry, the generation amount of. OH is enhanced, degradation of refractory organics in the oil sludge digestion liquid is improved, and the refractory organics are returned to the front-end sludge digestion tank as small-molecular organics, so that the oil sludge digestion efficiency is further enhanced, and the oil sludge treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to oil sludge treatment technical field especially, relates to a complete set of device based on hydrodynamic cavitation coupling Fenton - electrochemical treatment oil sludge. BACKGROUND

[0002] The current social and economic development, the demand of industrial production to resources is increasing, the development and exploitation of fossil fuels such as oil are increasingly widespread, and the production of oil-containing sludge is also increasing. At present, China has more than 400 oilfields in the exploration and development state, and the annual production of oil-containing sludge reaches more than 5 million tons.

[0003] The specific resistance of oil-containing sludge is 40 times that of ordinary sludge, and it is complex in composition, also contains a large amount of oil, organic compounds, acid gases, primary minerals, secondary minerals and heavy metals and sundries. After the suspended flocculus is mixed with sundries and crude oil, it forms stable colloidal material, resulting in high water content, dehydration difficulty and large treatment difficulty. In addition, the pollutants and inorganic solids in the oil sludge are combined and fully emulsified by adding reagents in sewage treatment, which makes the composition of oil-containing sludge more complex and more difficult to treat. Anaerobic digestion is one of the most commonly used methods for treating sludge. However, the existence of sludge microbial bacteria and the complex composition of extracellular polymers limit the hydrolysis efficiency of anaerobic digestion, resulting in low gas production and long cycle. Various pretreatment methods are needed to improve the efficiency of anaerobic digestion.

[0004] Cavitation is the formation of small bubbles when the local pressure in the liquid drops, and when the bubbles collapse, a large amount of energy is released in a very small space, accompanied by physical (high temperature, strong impact force and high-speed jet, etc.) and chemical effects (mainly ·OH). Cavitation effect can destroy sludge cell wall and structure, promote sludge flocculus disintegration and reduction. Compared with ultrasonic cavitation, hydrodynamic cavitation shows similar cavitation effect and mass transfer enhancement effect, and has higher energy utilization rate, better cavitation effect and wider application range. However, whether it is to design a new type of cavitation device or to optimize the device conditions, the single treatment effect of cavitation is not ideal. Based on the current limitations of overcoming the use of hydrodynamic cavitation alone and the development trend of improving Fenton technology to oxidize oil sludge, this paper proposes a combined device of hydrodynamic cavitation coupling Fenton-electrochemical enhanced oil sludge demulsification-digestion-oxidation. SUMMARY

[0005] This section aims to summarize some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In view of the above problems of the complete device for treating sludge based on hydrodynamic cavitation coupled Fenton-electrochemical treatment, the utility model provides a complete device for treating sludge based on hydrodynamic cavitation coupled Fenton-electrochemical treatment.

[0007] Therefore, the utility model aims at providing a complete device for treating sludge based on hydrodynamic cavitation coupled Fenton-electrochemical treatment, which is used to solve the problems of "the existing cavitation effect can destroy the cell wall and structure of sludge and promote sludge floc disintegration and reduction. Compared with ultrasonic cavitation, hydrodynamic cavitation shows similar cavitation effect and mass transfer enhancement effect, and has higher energy utilization rate, better cavitation effect and wider application range. However, whether a new cavitation device is designed or the device condition is optimized, the separate treatment effect of cavitation is not ideal."

[0008] To solve the above technical problems, the utility model provides the following technical scheme: a complete device for treating sludge based on hydrodynamic cavitation coupled Fenton-electrochemical treatment, comprising:

[0009] The main unit comprises a homogenizing tank, a first hydrodynamic cavitation reactor, a three-phase centrifuge, a sludge digestion tank, a horizontal screw centrifuge, an electrolysis reactor, a second hydrodynamic cavitation reactor, a crude oil storage tank, a biogas residue storage tank and a reagent feeding device, a first high-pressure pump is fixedly installed on the side wall of the homogenizing tank, the input end of the first high-pressure pump is in communication with the inside of the homogenizing tank, the output end of the first high-pressure pump is in communication with the inside of the first hydrodynamic cavitation reactor, the output end of the first hydrodynamic cavitation reactor is in communication with the inside of the three-phase centrifuge through a No. 1 pipeline, a first outlet and a second outlet are fixedly installed on the three-phase centrifuge, the other ends of the first outlet and the second outlet are in communication with the inside of the crude oil storage tank and the sludge digestion tank through a No. 2 pipeline respectively, the sludge digestion tank is in communication with the inside of the horizontal screw centrifuge through a No. 3 pipeline, a No. 1 outlet and a No. 2 outlet are fixedly installed on the horizontal screw centrifuge, an inlet A, an inlet B and an inlet C are fixedly installed on the electrolysis reactor, the No. 1 outlet and the No. 2 outlet are in communication with the inside of the biogas residue storage tank and the inlet A through a No. 4 pipeline respectively, a second high-pressure pump is fixedly installed on the side wall of the electrolysis reactor, the output end of the second high-pressure pump is in communication with the inside of the second hydrodynamic cavitation reactor, a discharge port is arranged on the biogas residue storage tank, and the discharge port is in communication with the inside of the homogenizing tank through a No. 6 pipeline.

[0010] As a preferred scheme of the complete device for treating sludge based on hydrodynamic cavitation coupled Fenton-electrochemical treatment, a circulating pump is fixedly installed on the side wall of the electrolysis reactor, the input end of the circulating pump is in communication with the inside of the electrolysis reactor, the output end of the circulating pump is in communication with the inlet C through a reflux pipe, and a sludge outlet is arranged at the bottom of the electrolysis reactor and connected with the biogas residue storage tank.

[0011] As a kind of preferred scheme of the utility model discloses a kind of based on hydraulic cavitation coupling fenton-electrochemical treatment of oil sludge's complete device, wherein: the medicament dosing device includes medicament storage tank and dosing pump, the input end of the dosing pump is communicated with medicament storage tank inside, the output end of the dosing pump is communicated with import B by No.

[0012] As a kind of preferred scheme of the utility model discloses a kind of based on hydraulic cavitation coupling fenton-electrochemical treatment of oil sludge's complete device, wherein: multiple groups of noble metal electrodes are arranged in the electrolytic reactor, the noble metal electrodes are arranged in parallel, and the electrodes are connected to one or more parallel rectifiers.

[0013] As a kind of preferred scheme of the utility model discloses a kind of based on hydraulic cavitation coupling fenton-electrochemical treatment of oil sludge's complete device, wherein: a discharge port is fixedly installed on the second hydraulic cavitation reactor, and the discharge port is communicated with the inside of the sludge digestion tank through No.

[0014] As a kind of preferred scheme of the utility model discloses a kind of based on hydraulic cavitation coupling fenton-electrochemical treatment of oil sludge's complete device, wherein: the first hydraulic cavitation reactor is a rotary hydraulic cavitation device; and the second hydraulic cavitation reactor is a Venturi tube embedded with a perforated plate type reactor.

[0015] The utility model has the advantages of:

[0016] 1. The oil sludge is treated by hydraulic cavitation, the cavitation effect of hydraulic cavitation is utilized to realize efficient demulsification of oil sludge and improve oil removal rate; meanwhile, ·OH is generated by cavitation to degrade macromolecules and toxic substances in the oil sludge and improve anaerobic digestion efficiency.

[0017] 2. The amount of ·OH is increased by using hydraulic cavitation coupling fenton-electrochemical method, degradation of refractory organic matter in oil sludge digestion liquid is improved, and small-molecule organic matter is returned to the front sludge digestion tank, so that the oil sludge digestion efficiency is further improved, and the oil sludge treatment efficiency is improved.

[0018] 3. A large amount of ·OH is generated by catalyzing hydrogen peroxide under the action of an electric field in the electrolytic reactor to oxidize and degrade organic matter, and Fe3+ generated in the cathode is reduced to Fe2+; Fe2+ is recycled in the electrolytic reactor by a reflux pump, the addition amount of Fe2+ catalyst is saved, and the amount of Fe3+ sludge is reduced.

[0019] 4. The automatic quantitative dosing of fenton reagent is controlled by the flow meter and the regulating valve, the medicament dosing is saved, and automatic feedback control is realized.

[0020] 5. The rotating type hydraulic cavitation device is not easy to stick; the orifice plate type hydraulic cavitation reactor in the Venturi tube has the double advantages of the Venturi tube and the orifice plate, and the cavitation effect is strengthened, and macromolecular oxidation and toxic organic matter can be effectively degraded. Different types of hydraulic cavitation reactors are combined and applied, and the oil sludge has good treatment effect, realizes zero discharge harmless treatment of oil sludge, and broadens the application field. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor. Among them:

[0022] Fig. 1 It is a schematic diagram of a complete device for treating oil sludge based on hydraulic cavitation coupled Fenton-electrochemical treatment of the present application.

[0023] Fig. 2 It is a schematic diagram of a reagent feeding device in a complete device for treating oil sludge based on hydraulic cavitation coupled Fenton-electrochemical treatment of the present application.

[0024] BRIEF DESCRIPTION OF DRAWINGS: 100, main unit; 101, homogenizing tank; 102, first hydraulic cavitation reactor; 103, three-phase centrifuge; 104, sludge digestion tank; 105, horizontal screw centrifuge; 106, electrolytic reactor; 107, second hydraulic cavitation reactor; 108, crude oil storage tank; 109, biogas residue storage tank; 110, reagent feeding device; 1101, reagent storage tank; 1102, reagent feeding pump; 1103, regulating valve; 1104, flowmeter. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the drawings of the specification.

[0026] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0027] Secondly, the "one embodiment" or "embodiment" referred to herein is intended to mean a specific feature, structure, characteristic, or combination of features and characteristics described herein that is included in at least one implementation of the present application. The various appearances of "in one embodiment" or "in an embodiment" in the specification are not necessarily all referring to the same embodiment, although they can.

[0028] Thirdly, the present application is described in detail in combination with the schematic diagram. In the detailed description of the embodiments of the present application, the sectional view of the device structure is locally enlarged without the general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in the actual manufacture.

[0029] Referring to Figs. 1-2 For one embodiment of the present application, a complete set of device for treating oil sludge based on hydrodynamic cavitation coupled Fenton-electrochemical is provided, which comprises:

[0030] The main unit 100 comprises a homogenizing tank 101, a first hydrodynamic cavitation reactor 102, a three-phase centrifuge 103, a sludge digestion tank 104, a horizontal screw centrifuge 105, an electrolytic reactor 106, a second hydrodynamic cavitation reactor 107, a crude oil storage tank 108, a biogas residue storage tank 109, and a reagent feeding device 110. A first high-pressure pump is fixedly installed on the side wall of the homogenizing tank 101. The input end of the first high-pressure pump is in communication with the inside of the homogenizing tank 101. The output end of the first high-pressure pump is in communication with the inside of the first hydrodynamic cavitation reactor 102. The output end of the first hydrodynamic cavitation reactor 102 is in communication with the inside of the three-phase centrifuge 103 through a No. 1 pipeline. A first outlet and a second outlet are fixedly installed on the three-phase centrifuge 103. The other ends of the first outlet and the second outlet are respectively in communication with the inside of the crude oil storage tank 108 and the sludge digestion tank 104 through a No. 2 pipeline. The sludge digestion tank 104 is in communication with the inside of the horizontal screw centrifuge 105 through a No. 3 pipeline. A No. 1 outlet and a No. 2 outlet are fixedly installed on the horizontal screw centrifuge 105. An inlet A, an inlet B, and an inlet C are fixedly installed on the electrolytic reactor 106. The No. 1 outlet and the No. 2 outlet are respectively in communication with the inside of the biogas residue storage tank 109 and the inlet A through a No. 4 pipeline. A second high-pressure pump is fixedly installed on the side wall of the electrolytic reactor 106. The output end of the second high-pressure pump is in communication with the inside of the second hydrodynamic cavitation reactor 107. A discharge port is provided on the biogas residue storage tank 109. The discharge port is in communication with the inside of the homogenizing tank 101 through a No. 6 pipeline. A discharge outlet is fixedly installed on the second hydrodynamic cavitation reactor 107. The discharge outlet is in communication with the inside of the sludge digestion tank 104 through a No. 7 pipeline.

[0031] Adopting the technical scheme, the oil sludge is fed from the storage tank into the first hydrodynamic cavitation reactor 102 through the first high-pressure pump, and is subjected to oxidation treatment through the physical effects of high temperature, strong impact force and high-speed jet flow generated by the hydrodynamic cavitation effect and the chemical effects, so as to achieve the destruction of the emulsification structure of the oil sludge and the oxidative degradation of macromolecules and toxic substances. After separation by the three-phase centrifuge 103, the water phase and the oil sludge subjected to the oxidation treatment are mixed and fed into the sludge digestion tank 104 for anaerobic digestion treatment. The crude oil is fed into the crude oil storage tank 108. After anaerobic digestion, the sludge water is separated by the horizontal screw centrifuge 105, and the biogas slurry is fed into the electrolytic reactor 106 for further oxidation treatment. Here, the Fenton reagent is added through the reagent adding device 110, and the second hydrodynamic cavitation reactor 107 is further coupled to strengthen the amount of ·OH generated by the hydrodynamic cavitation effect, so as to further strengthen the oxidation effect and further oxidize and degrade the refractory organic matter in the biogas slurry into small molecules, which are returned to the front-end sludge digestion tank 104 to enhance the nutrition of microbial organic matter and strengthen the anaerobic digestion efficiency.

[0032] The side wall of the electrolytic reactor 106 is fixedly provided with a circulating pump, the input end of the circulating pump is in communication with the inside of the electrolytic reactor 106, the output end of the circulating pump is in communication with the inlet C through a reflux pipe, and the bottom of the electrolytic reactor 106 is provided with a sludge outlet connected to a biogas residue storage tank 109. A plurality of groups of noble metal electrodes are arranged in the electrolytic reactor 106, the noble metal electrodes are arranged in parallel, and the electrodes are connected to one or more parallel rectifiers.

[0033] Adopting the technical scheme, the ·OH is generated by catalyzing hydrogen peroxide under the action of an electric field in the electrolytic reactor 106 to oxidize and degrade organic matter, and Fe3+ generated is reduced to Fe2+ at the cathode. Fe2+ is recycled in the electrolytic reactor 106 by the reflux pump, so as to save the addition amount of Fe2+ catalyst and reduce the amount of Fe3+ sludge.

[0034] The reagent adding device 110 includes a reagent storage tank 1101 and a reagent pump 1102. The input end of the reagent pump 1102 is in communication with the inside of the reagent storage tank 1101, and the output end of the reagent pump 1102 is in communication with the inlet B through a No. 5 pipe. An adjusting valve 1103 and a flow meter 1104 are fixedly arranged on the No. 5 pipe.

[0035] Adopting the technical scheme, the Fenton reagent is automatically adjusted by the flow meter 1104 and the adjusting valve 1103 to realize quantitative reagent addition, so as to save the reagent addition and realize automatic feedback control.

[0036] The first hydrodynamic cavitation reactor 102 is a rotary hydrodynamic cavitation device, and the second hydrodynamic cavitation reactor 107 is a Venturi tube embedded with a perforated plate type reactor.

[0037] By adopting the technical scheme, the rotating type water power cavitation device adopts a high-speed rotating stator cavity to generate cavitation effect, has a good treatment effect on oil sludge, and is not easy to be blocked; the Venturi tube embedded with the orifice plate type water power cavitation reactor has the dual advantages of the Venturi tube and the orifice plate, strengthens the cavitation effect, and can effectively degrade oxidized macromolecules and toxic organic matters.

[0038] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A complete set of equipment for treating oil sludge based on hydraulic cavitation coupled with Fenton-electrochemical methods, characterized in that, include: The main unit (100) includes a homogenizing tank (101), a first hydraulic cavitation reactor (102), a three-phase centrifuge (103), a sludge digestion tank (104), a horizontal screw centrifuge (105), an electrolysis reactor (106), a second hydraulic cavitation reactor (107), a crude oil storage tank (108), a biogas residue storage tank (109), and a reagent dosing device (110). A first high-pressure pump is fixedly installed on the side wall of the homogenizing tank (101). The input end of the first high-pressure pump is connected to the inside of the homogenizing tank (101), and the output end of the first high-pressure pump is connected to the inside of the first hydraulic cavitation reactor (102). The output end of the first hydraulic cavitation reactor (102) is connected to the inside of the three-phase centrifuge (103) through a No. 1 pipe. A first outlet and a second outlet are fixedly installed on the three-phase centrifuge (103). The first and second outlets have two outlets. The other ends of the first and second outlets are connected to the crude oil storage tank (108) and the sludge digestion tank (104) through pipe No. 2, respectively. The sludge digestion tank (104) is connected to the interior of the horizontal screw centrifuge (105) through pipe No.

3. The horizontal screw centrifuge (105) has outlet No. 1 and outlet No. 2 fixedly installed. The electrolysis reactor (106) has inlet A, inlet B and inlet C fixedly installed. The first and second outlets are connected to the interior of the biogas residue storage tank (109) and inlet A through pipe No. 4, respectively. The side wall of the electrolysis reactor (106) has a second high-pressure pump fixedly installed. The output end of the second high-pressure pump is connected to the interior of the second hydraulic cavitation reactor (107). The biogas residue storage tank (109) is provided with a discharge port, which is connected to the interior of the homogenizing tank (101) through pipe No.

6.

2. The complete set of equipment for treating oil sludge based on hydraulic cavitation coupled with Fenton-electrochemical methods according to claim 1, characterized in that: A circulation pump is fixedly installed on the side wall of the electrolysis reactor (106). The input end of the circulation pump is connected to the inside of the electrolysis reactor (106), and the output end of the circulation pump is connected to the inlet C through a return pipe. A sludge outlet is provided at the bottom of the electrolysis reactor (106) to connect to the biogas residue storage tank (109).

3. The complete set of equipment for treating oil sludge based on hydraulic cavitation coupled with Fenton-electrochemical methods according to claim 1, characterized in that: The dosing device (110) includes a drug storage tank (1101) and a dosing pump (1102). The input end of the dosing pump (1102) is connected to the inside of the drug storage tank (1101), and the output end of the dosing pump (1102) is connected to inlet B through pipe No.

5. A regulating valve (1103) and a flow meter (1104) are fixedly installed on pipe No.

5.

4. The complete set of equipment for treating oil sludge based on hydraulic cavitation coupled with Fenton-electrochemical treatment according to claim 1, characterized in that: Multiple sets of precious metal electrodes are provided in the electrolysis reactor (106), the precious metal electrodes are arranged in parallel, and the electrodes are connected to one or more parallel rectifiers.

5. The complete set of equipment for treating oil sludge based on hydraulic cavitation coupled with Fenton-electrochemical methods according to claim 1, characterized in that: The second hydraulic cavitation reactor (107) is fixedly equipped with a discharge port, which is connected to the inside of the sludge digester (104) through pipe No.

7.

6. The complete set of equipment for treating oil sludge based on hydraulic cavitation coupled with Fenton-electrochemical treatment according to claim 1, characterized in that: The first hydraulic cavitation reactor (102) is a rotary hydraulic cavitation device; the second hydraulic cavitation reactor (107) is a venturi tube with nested perforated plate reactor.

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