Normal-temperature reduction treatment system for oily sludge

Abstract

The utility model aims to provide a normal-temperature reduction treatment system for oily sludge, and belongs to the technical field of oily sludge treatment. The device comprises a fluidization cleaning tank, a conditioning tank, a high-pressure dehydrator, an oil-water separation tank and an oil-water storage tank, the fluidized cleaning tank is used for carrying out chemical thermal cleaning on the oily sludge, the separated upper-layer oil phase is recycled to an oil storage bin of the oil-water storage tank through a floating oil collector I, the lower-layer sludge is conveyed to the conditioning tank through a slurry pump for coagulation reaction, and the sludge after coagulation reaction is conveyed to the high-pressure dehydrator through the slurry pump; and the solid phase separated by the high-pressure dehydrator is subjected to subsequent thermal desorption treatment, and the separated liquid phase is conveyed to an oil-water separation tank through a slurry pump. Oily sludge is treated by the fluidization cleaning tank, the conditioning tank and the high-pressure dehydrator in sequence, so that the solid-phase moisture content of the oily sludge is reduced to below 40% in a normal-temperature environment, the requirement of subsequent thermal desorption treatment is met, and the oily sludge treatment device is simple in structure, low in cost, safe and environment-friendly.

Description

Technical Field

[0001] The utility model relates to the technical field of oily sludge treatment, and particularly relates to a normal-temperature reduction treatment system for oily sludge. Background Art

[0002] Oily sludge is a three-phase mixture of oil, water and solid generated during oilfield development, transportation and refining. It can be roughly divided into several categories: including the fallen oil sludge in oilfield development, the bottom oil sludge in crude oil storage and transportation, the refined oil sludge generated in petroleum refining, and the rinsed oily sewage, etc. Most of the oily sludge has a high water content and contains toxic and harmful substances such as sulfides, benzene series, phenols, anthracene, pyrene, etc. Moreover, some hydrocarbon substances contained in the oil have carcinogenic, teratogenic and mutagenic effects. Oily sludge has been listed as hazardous solid waste (HW08) by the state and is treated as a hazardous substance.

[0003] At present, the industry mostly adopts the treatment process of "hot washing solid-liquid separation + mud cake heat drying dehydration + dry solid heat desorption". As is well known, the water content of the solid phase after dehydration by conventional solid-liquid separation equipment for oily sludge is too high to directly enter the heat desorption treatment. Forced treatment will lead to a reduction in the treatment efficiency of heat desorption and an increase in treatment costs. Therefore, it is necessary to use heat drying technology to dry and dehydrate the solid phase with a high water content by heat treatment. Most of the commonly used heat drying and dehydration equipment at present consists of a boiler and a heat dryer. In addition to the defects of complex process, high cost and low treatment efficiency in the existing heat drying and dehydration technology, high-temperature treatment also brings safety and environmental protection problems. Content of the Utility Model

[0004] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a normal-temperature reduction treatment system for oily sludge. The oily sludge is sequentially treated by a fluidized cleaning tank, a conditioning tank and a high-pressure dehydrator, so that the water content of the solid phase of the oily sludge is reduced to less than 40% under normal temperature environment, greatly improving the treatment efficiency of subsequent heat desorption, with simple structure, low cost and safety and environmental protection.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: a normal-temperature reduction treatment system for oily sludge, comprising a fluidized cleaning tank, a conditioning tank, a high-pressure dehydrator, an oil-water separation tank and an oil-water storage tank;

[0006] The fluidized cleaning tank performs chemical heat cleaning on the oily sludge. The upper-layer oil phase after separation is recovered to the oil storage bin of the oil-water storage tank through the floating oil collector I, and the lower-layer sludge is transported to the conditioning tank by a slurry pump for coagulation reaction. The sludge after coagulation reaction is transported to the high-pressure dehydrator by a slurry pump;

[0007] The pressure of the high-pressure dehydrator is 10 MPa to 15 MPa. The solid phase separated by the high-pressure dehydrator enters the subsequent heat desorption treatment, and the separated liquid phase is transported to the oil-water separation tank by a slurry pump.

[0008] As an improvement of the present utility model, it further includes a dissolved air flotation machine. The oil phase separated by the oil-water separation tank is transported to the oil storage bin of the oil-water storage tank through the floating oil collector II, and the remaining liquid phase separated is transported to the dissolved air flotation machine through a slurry pump. The floating slag treated by the dissolved air flotation machine is transported to the conditioning tank for cyclic treatment, and the treated water is returned to the water storage bin of the oil-water storage tank for cyclic utilization.

[0009] As an improvement of the present utility model, it further includes a dosing device, and the dosing device provides medicaments for the fluidized cleaning tank, the conditioning tank and the dissolved air flotation machine.

[0010] As an improvement of the present utility model, the conditioning tank includes an upper tank and a lower tank. The upper tank is a coagulation reaction tank, and the lower tank is used for storing the sludge after the coagulation reaction in the upper tank.

[0011] The beneficial effects of the present utility model are as follows: By sequentially treating the oily sludge through the fluidized cleaning tank, the conditioning tank and the high-pressure dehydrator, since the high-pressure dehydrator works at normal temperature, the solid phase water content of the oily sludge is reduced to less than 40% under the normal temperature environment, meeting the requirements of subsequent thermal desorption treatment, realizing the reduction, harmlessness and resource utilization of the oily sludge, greatly improving the treatment efficiency of subsequent thermal desorption, with simple structure, low cost and safe environmental protection.

[0012] As is well known, the water content in the oily sludge in different regions and different places is different. For example, the water content of the oily sludge in the oil production plant combined station is 50% - 80%, the water content of the oily sludge after thermal cleaning, extraction and other treatments is 60% - 80%, the water content of the oily sludge after sewage treatment in the refinery is 70% - 90%, etc. After being treated by the present utility model, the solid phase water content of the oily sludge in all the above regions and all places can be controlled below 40%, expanding the application places of the system.

[0013] Further, it further includes a dissolved air flotation machine. The oil phase separated by the oil-water separation tank is transported to the oil storage bin of the oil-water storage tank through the floating oil collector II, and the remaining liquid phase separated is transported to the dissolved air flotation machine through a slurry pump. The floating slag treated by the dissolved air flotation machine is transported to the conditioning tank for cyclic treatment, and the treated water is returned to the water storage bin of the oil-water storage tank for cyclic utilization. Through the above-mentioned dissolved air flotation machine, it is convenient to separate the water in the remaining liquid phase in the oil-water separation tank and recycle it to the water storage bin of the oil-water storage tank, saving water resources and operation costs.

[0014] Furthermore, the conditioning tank includes an upper tank and a lower tank. The upper tank is a coagulation reaction tank, and the lower tank is used to store the sludge after the coagulation reaction in the upper tank. By designing the conditioning tank as an upper tank and a lower tank, the interruption time during the continuous treatment of oily sludge is reduced, the ability of the entire system to continuously treat oily sludge is ensured, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] In the figure, 1. Fluidized cleaning tank; 2. Oil skimmer I; 3. Conditioning tank; 4. High-pressure dehydrator; 5. Dissolved air flotation machine; 6. Oil-water separation tank; 7. Oil skimmer II; 8. Oil-water storage tank; 9. Chemical dosing device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0018] It should be noted that the orientation terms such as upper, lower, top, bottom, etc. in the embodiments of the present invention are only relative concepts to each other or are referenced based on the normal use state of the product, and should not be considered as restrictive.

[0019] As Figure 1 shown, a normal-temperature reduction treatment system for oily sludge includes a fluidized cleaning tank 1, a conditioning tank 3, a high-pressure dehydrator 4, an oil-water separation tank 6, a dissolved air flotation machine 5, an oil-water storage tank 8, and a chemical dosing device 9. Among them, the fluidized cleaning tank 1 performs chemical thermal cleaning on the oily sludge. The upper oil phase after separation is recovered to the oil storage bin of the oil-water storage tank 8 through the oil skimmer I 2, and the lower sludge is transported to the conditioning tank 3 through a slurry pump for coagulation reaction. The sludge after the coagulation reaction is transported to the high-pressure dehydrator 4 through a slurry pump; the pressure of the high-pressure dehydrator 4 is 10 MPa to 15 MPa. The solid phase separated by the high-pressure dehydrator 4 enters the subsequent thermal desorption treatment, and the separated liquid phase is transported to the oil-water separation tank 6 through a slurry pump. The oil phase separated by the oil-water separation tank 6 is transported to the oil storage bin of the oil-water storage tank 8 through the oil skimmer II 7, and the remaining liquid phase except the oil phase separated is transported to the dissolved air flotation machine 5 through a slurry pump. The floating slag treated by the dissolved air flotation machine 5 is transported to the conditioning tank 3 for cyclic treatment, and the treated water is recycled to the water storage bin of the oil-water storage tank 8. During the entire treatment process of the oily sludge, the above chemical dosing device 9 provides the required chemicals for the fluidized cleaning tank 1, the conditioning tank 3, and the dissolved air flotation machine 5.

[0020] Preferably, the conditioning tank 3 includes an upper tank and a lower tank. The upper tank is a coagulation reaction tank, and the lower tank is used to store the sludge after coagulation reaction in the upper tank. By designing the conditioning tank as an upper tank and a lower tank, the interruption time during the continuous treatment of oily sludge is reduced, the ability of the whole system to continuously treat oily sludge is ensured, and the working efficiency is improved.

[0021] Preferably, the floating oil collector I 2 is installed on the top of the fluidized cleaning tank 1, and the floating oil collector II 7 is installed on the top of the oil-water separation tank 6. Through the above design, the recovery of floating oil is conveniently realized, and the structure is simple. The oil-water separation tank 6 preferably adopts the oil-water separation device in the Chinese patent CN213895291U "A skid-mounted oil-water separation device" applied by the applicant in 2020.

[0022] It should be noted that the chemical thermal cleaning of oily sludge in the fluidized cleaning tank 1 means that in the fluidized cleaning tank 1, the oily sludge is homogenized and fluidized by adding medicine and hot water through a stirrer; the coagulation reaction in the conditioning tank 3 means that by adding a flocculant and a coagulant in the tank, the oil-containing particles and solid-phase substances are flocculated into large molecular flocs. Since the above chemical thermal cleaning and coagulation reaction are both known and mature technical means, no detailed description will be made here.

[0023] Through the treatment of the normal temperature reduction treatment system of this embodiment, the oily sludge from a certain place in Daqing with an original oil content of 14.35% and a water content of 25.09% can be treated into solid waste with an oil content of 3.15% and a water content of 11.21%; the oily sludge from a certain place in Nanyang with an original oil content of 18.35% and a water content of 38.35% can be treated into solid waste with an oil content of 7% and a water content of about 29%. The reduction index of the oily sludge meets the requirements of thermal desorption treatment.

[0024] The above is a detailed introduction to a normal temperature reduction treatment system for oily sludge provided by the present invention. Specific examples are used in this article to elaborate on the structural principle and implementation method of the present invention. The above embodiments are only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A room temperature reduction treatment system for oily sludge, characterized by: Including fluidized cleaning tanks, conditioning tanks, high-pressure dehydrators, oil-water separation tanks and oil-water storage tanks; The fluidized cleaning tank performs chemical thermal cleaning on the oily sludge, and the separated upper oil phase is recovered to the oil storage tank of the oil-water storage tank through the floating oil collector I, and the lower sludge is transported to the conditioning tank through the mud pump for coagulation reaction, and the sludge after the coagulation reaction is transported to the high-pressure dehydrator through the mud pump; The pressure of the high-pressure dehydrator is 10MPa-15MPa. The solid phase separated by the high-pressure dehydrator enters the subsequent thermal analysis treatment, and the separated liquid phase is transported to the oil-water separation tank through a mud pump.

2. A room temperature reduction treatment system for oily sludge according to claim 1, characterized in that: It also includes a dissolved air flotation machine. The oil phase separated by the oil-water separation tank is transported to the oil storage bunker of the oil-water storage tank through the floating oil collector II, and the separated remaining liquid phase is transported to the dissolved air flotation machine through a mud pump. The scum treated by the dissolved air flotation machine is transported to a conditioning tank for cyclic treatment, and the treated water is returned to the water storage bunker of the oil-water storage tank for recycling.

3. The room temperature reduction treatment system for oily sludge according to claim 1 is characterized in that: It also includes a dosing device, which provides medicines for the fluidized cleaning tank, the conditioning tank and the dissolved air flotation machine.

4. A room temperature reduction treatment system for oily sludge according to claim 1, 2 or 3, characterized in that: The conditioning tank comprises an upper tank and a lower tank, the upper tank is a coagulation reaction tank, and the lower tank is used to store sludge after the coagulation reaction in the upper tank.

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