Rotary scanning type air flotation device for chemical thermal cleaning of oily sludge

Abstract

The utility model provides a rotary scanning type air flotation device for chemical thermal cleaning of oily sludge, the rotary scanning type air flotation device comprises a sludge tank, a rotary system, a gas transmission system and a control system, the rotary system comprises a rotary motion device and a scanning spoke group for generating bubbles; the scanning spoke group is located in the sludge tank, the control system controls the gas transmission system to input gas to scanning spokes of the scanning spoke group, and the control system controls the scanning spoke group to rotate in the sludge tank through the rotary motion device. According to the oil-water separation device, the problems that in the prior art, bubbles injected into oil-water suspension liquid are more uniform, the bubbles make more sufficient contact with de-missible oil drops in the oil-water suspension liquid, the oil-water separation efficiency is higher, and the oil-water separation effect is better are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of oilfield oily sludge harmless treatment especially relates to a kind of rotary scanning type air floatation device for oily sludge chemical heat cleaning. BACKGROUND

[0002] Oily sludge refers to the sludge mixed with crude oil, various finished oil, residual oil and other heavy oil. It is mainly produced in the process of oilfield exploitation, petroleum refining, transportation, use, storage and other processes. Oily sludge is harmful to human body, harmful to plants and aquatic organisms, and the oil gas evaporated in the air can stimulate the skin, eyes and respiratory organs, making the land lose the function of plant growth. It is difficult to handle and repair, and is one of the main pollutants in petroleum and petrochemical industry. Oily sludge has a code of HW08 in the national hazardous waste list.

[0003] Among various harmless treatment methods of oily sludge, chemical heat cleaning method has the advantages of mature technology, simple operation, low cost, small energy consumption and resource recycling, etc. It is one of the mainstream technologies for treating oily sludge in China at present.

[0004] Oily sludge is generally a stable suspended emulsion system composed of oil-in-water (o / w), water-in-oil (w / o) and suspended solids, with poor dewatering effect, large difference in sludge composition, high treatment difficulty and large difference in oil content.

[0005] The main process of oily sludge chemical heat cleaning mainly includes: preparation of cleaning agent aqueous solution, mixing of agent solution and oily sludge, heating and mechanical stirring, air flotation, ultrasonic vibration to enhance desorption, scraping of surface oil foam, etc. The principle of air flotation process is to use the adsorption of small bubbles and oil droplets in liquid to bring out the small oil droplets in the suspension liquid by injecting small bubbles, so as to separate oil and water.

[0006] The current air floatation device technology mainly uses fixed air source device, and the uniformity of bubbles injected into oil-water suspension liquid is poor, and the corresponding oil removal effect is also poor.

[0007] Therefore, how to make the bubbles injected into oil-water suspension liquid more uniform, make the bubbles contact with the desorbed oil droplets in oil-water suspension liquid more fully, and make the oil-water separation efficiency higher and the effect better, become the technical problem to be solved. UTILITY MODEL CONTENTS

[0008] The utility model aims at providing a kind of rotary scanning type air floatation device for oily sludge chemical heat cleaning, mainly solves the problem of how to make the bubbles injected into oil-water suspension liquid more uniform, make the bubbles contact with the desorbed oil droplets in oil-water suspension liquid more fully, and make the oil-water separation efficiency higher and the effect better in the prior art.

[0009] In order to achieve the above object, the utility model adopts the technical scheme: a kind of rotary scanning type air floatation device for oily sludge chemical hot cleaning, it is characterized by: the rotary scanning type air floatation device includes sludge pool, rotating system, gas conveying system and control system, rotating system includes rotating motion device and the scanning radial group for generating bubble;

[0010] Scanning radial group is located in sludge pool, control system controls gas conveying system for the scanning radial input gas of scanning radial group, control system rotates motion device controls scanning radial group in sludge pool and rotates motion.

[0011] Further, scanning radial group contains scanning radial, scanning radial is the pipeline of special section, the upper surface of special section is circular arc, the lower surface of special section is equipped with recess, and the bottom of recess is equipped with air hole.

[0012] Further, rotating motion device further includes hollow shaft, and one end of the plurality of scanning radials of scanning radial group is connected to the hollow shaft, and the space in each scanning radial is in communication with the space in the hollow shaft.

[0013] The plurality of scanning radials of scanning radial group are uniformly and symmetrically arranged on a plane perpendicular to the hollow shaft.

[0014] Further, the air holes on each scanning radial are non-uniformly arranged, the space distance between adjacent air holes close to the outer end of the scanning radial is small, and the space distance between adjacent air holes close to the hollow shaft is large.

[0015] Further, the rotating motion device further includes a fixed support and a variable frequency motor for rotating the hollow shaft, the fixed support is installed directly above the sludge pool, the variable frequency motor is installed on the fixed support, and the variable frequency motor is connected to the hollow shaft.

[0016] Further, the gas conveying system includes a gas conveying pipeline and a gas storage tank, the gas storage tank is connected to the gas conveying port of the hollow shaft through the gas conveying pipeline, the gas storage tank, the gas conveying pipeline, the hollow shaft and the scanning radial are internally connected to form a gas passage.

[0017] Further, the control system includes a PLC logic controller, a control valve and a frequency converter, the control valve is installed on the gas conveying pipeline, the frequency converter is connected to the variable frequency motor, the PLC logic controller is communicatively connected to the frequency converter, and the PLC logic controller is communicatively connected to the control valve; the control valve is used to control the size of the gas conveying amount of the gas conveying pipeline.

[0018] Further, the sludge pool is cylindrical, and the length of the scanning radial is less than the radius of the cylindrical sludge pool.

[0019] The scanning radial group is installed at the bottom end of the hollow shaft.

[0020] Further, the scanning radial group includes 2-30 scanning radials.

[0021] In view of the above technical features, the utility model has the following beneficial effects:

[0022] 1. The rotating scanning type air floatation device for chemical and thermal cleaning of oily sludge, through the rotating motion device, the rotating scanning radiators in the sludge pool are realized, the bubble string group injected into the oil-water suspension in the pool does the rising and rotating compound motion, more paths and areas can be contacted in the suspension, compared with the fixed air floatation injection device, the bubbles and the suspension are mixed more uniformly, the same bubble size and air volume can adsorb more oil droplets.

[0023] 2. The rotating scanning type air floatation device for chemical and thermal cleaning of oily sludge, the scanning radiators with the concealed air holes can reduce or lower the air holes of the scanning radiators blocked by the particles in the oil-water suspension because of the settlement or stirring collision, and the foaming air floatation effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 It is a structure schematic view of a rotating scanning type air floatation device for chemical and thermal cleaning of oily sludge in embodiment 1.

[0025] Fig. 2 It is a structure schematic view (top view) of the scanning radiator group in embodiment 1.

[0026] Fig. 3 It is a structure schematic view (cross section) of the scanning radiator in embodiment 1.

[0027] In the figure: 1, cylindrical sludge pool;

[0028] 21, fixed support; 22, frequency conversion motor; 23, hollow shaft; 231, gas conveying port; 24, scanning radiator; 241, groove; 242, air hole;

[0029] 31, gas conveying pipeline; 32, gas storage tank;

[0030] 41, PLC logic controller; 42, control valve; 43, frequency converter. DETAILED DESCRIPTION

[0031] The utility model will be further described below in combination with the specific implementation. It should be understood that these embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, the person skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0032] Reference Figs. 1 to 3 , specific embodiment 1, the embodiment 1 provides a rotating scanning type air floatation device for oily sludge chemical heat cleaning, the rotating scanning type air floatation device includes sludge pool, rotating system, gas conveying system and control system, the rotating system includes rotating motion device and the scanning radial group for generating bubble.The sludge pool is cylindrical, also known as cylindrical sludge pool 1.

[0033] The scanning radial group is located in the sludge pool, the control system controls the gas conveying system to input the gas for the scanning radial 24 of the scanning radial group, and the control system controls the rotating motion of the scanning radial group in the sludge pool through the rotating motion device, to realize the rotating motion of the scanning radial group.When the scanning radial group rotates, the bubble string group injected into the pool by the compressed gas of the scanning radial 24 performs the rising and rotating compound motion (similar to scanning, hence the name "rotating scanning type air floatation device") in the oil-water suspension pool (i.e., cylindrical sludge pool 1), adsorbs and drives the oil droplets in the suspension to rise to the liquid surface, so that the bubbles injected into the oil-water suspension (i.e., the liquid in the sludge pool) are more uniform, the contact between the bubbles and the demulsified oil droplets in the oil-water suspension is more sufficient, and the oil-water separation efficiency is higher and the effect is better.

[0034] The scanning radial group contains the scanning radial 24, the scanning radial 24 is a pipe with a special-shaped cross section, the upper surface of the special-shaped cross section is a circular arc, and the lower surface of the special-shaped cross section is provided with a groove 241, and the bottom of the groove 241 is provided with a gas hole 242, i.e., a hidden gas hole 242.The scanning radial 24 in the embodiment 1 is in the shape of a strip, and the bottom is provided with a strip-shaped groove 241, and the bottom of the groove 241 is provided with a gas hole 242, so that the cross section of the scanning radial 24 presents a special-shaped cross section shape.During the rotating motion of the scanning radial group to which the scanning radial 24 belongs, the particles in the oil-water suspension cannot block the gas hole 242 of the scanning radial 24 due to sedimentation or collision caused by stirring.

[0035] The rotating motion device further includes a hollow shaft 23, one end of each of the plurality of scanning radials 24 of the scanning radial group is connected to the hollow shaft 23, and the space in each scanning radial 24 is in communication with the space in the hollow shaft 23; at this time, the plurality of scanning radials 24 and the hollow shaft 23 form a state of extending outward and at different angles from the center of the hollow shaft 23. Preferably, the scanning radial group is installed at the bottom end of the hollow shaft 23, so as to increase the residence time of the bubbles in the sludge pool as much as possible, so that the bubbles and the demulsified oil droplets in the oil-water suspension contact more fully, and the oil-water separation efficiency is higher and the effect is better.

[0036] The plurality of scanning radials 24 of the scanning radial group are uniformly and symmetrically arranged on a plane perpendicular to the hollow shaft 23, so as to increase the area that can be covered by the scanning radial group in the sludge pool as much as possible. For example, the scanning radial group includes 2-30 scanning radials 24, the more scanning radials 24, the more bubbles generated.

[0037] The air holes 242 on each scanning arm 24 are arranged non-uniformly, the space interval between adjacent air holes 242 near the outer end of the scanning arm 24 is small, and the space interval between adjacent air holes 242 near the hollow shaft 23 is large. This design can make the gas injected into the pool through the scanning arm 24 more evenly distributed in the pool. In addition, the length of the scanning arm 24 is less than the radius of the cylindrical sludge pool 1, which ensures that the scanning arm group can rotate in the cylindrical sludge pool 1.

[0038] The rotating motion device further comprises a fixed support 21 and a variable frequency motor 22 for driving the hollow shaft 23 to rotate, the fixed support 21 is installed directly above the sludge pool, the variable frequency motor 22 is installed on the fixed support 21, and the variable frequency motor 22 is connected with the hollow shaft 23.

[0039] The gas conveying system comprises a gas conveying pipeline 31 and a gas storage tank 32, the gas storage tank 32 is connected with the gas conveying port 231 of the hollow shaft 23 through the gas conveying pipeline 31, and the gas storage tank 32, the gas conveying pipeline 31, the hollow shaft 23 and the scanning arm 24 are internally through, forming a gas passage.

[0040] The control system comprises a PLC logic controller 41, a control valve 42 and a frequency converter 43, the control valve 42 is installed on the gas conveying pipeline 31, the frequency converter 43 is connected with the variable frequency motor 22, the PLC logic controller 41 is in communication connection with the frequency converter 43, and the PLC logic controller 41 is in communication connection with the control valve 42; the control valve 42 is used for controlling the on-off and the size of the gas conveying amount of the gas conveying pipeline 31. The PLC logic controller 41 can control the rotating speed of the variable frequency motor 22, the rotating speed of the hollow shaft 23 and the scanning arm group is controlled through the rotating speed of the variable frequency motor 22, and then the scanning speed is adjusted; the amount of compressed air input into the scanning arm 24 is also controlled through the control valve 42. By controlling the rotating speed of the scanning arm 24 and the amount of air injected into the pool, the gas floatation efficiency and effect during the hot washing of the oil-containing water suspension are adjusted.

[0041] The operation process of a rotating scanning type gas floatation device for chemical hot washing of oil-containing sludge:

[0042] (1) After the rotating scanning type gas floatation device for chemical hot washing of oil-containing sludge is installed and connected, the running logic control program is input into the PLC logic controller 41.

[0043] (2) The oil-water suspension diluted and demulsified is injected into the cylindrical sludge pool 1.

[0044] (3) Start the power supply, PLC logic controller 41 sends command signals to the frequency conversion motor 22 and control valve 42, the frequency conversion motor 22 starts to operate according to the received speed command, drives the hollow shaft 23 to rotate, and then drives the scanning radial group to rotate in the pool in a scanning mode; At the same time, the control valve 42 opens according to the received command opening, the compressed gas in the gas storage tank 32 enters the scanning radial 24 through the control valve 42, the gas pipeline 31, the hollow shaft 23, and enters the suspension pool (i.e. cylindrical sludge pool 1) through the air hole 242 on the scanning radial 24. When the scanning radial group rotates, the bubble string group produced by the compressed gas injected into the pool through the scanning radial 24 performs upward and rotational compound motion in the oil-water suspension pool, and adsorbs the oil droplets in the suspension to rise to the liquid surface.

[0045] For example, taking a cylindrical concrete oil sludge pool with a diameter of 2m and a depth of 1.8m as an example, the following is described: 1, the specification of the hollow shaft is selected as an outer diameter of φ114mm, a wall thickness of 4.0mm, and a seamless steel pipe of Q345 steel.

[0046] 2, the scanning radial 24 is selected as a seamless steel pipe of φ25mm, a wall thickness of 3.0mm, and Q345 steel. The length of a single rod is 900mm, and the scanning radial group is combined by 6 rods. The end of the scanning radial 24 is threaded and connected to the hollow shaft through a threaded joint + connecting seat.

[0047] 3, a 7.5kw frequency conversion motor 22 of Siemens S7-200 type is used, and a HuiChuan MD280 type frequency converter 43 is selected, and the communication mode is 485 communication.

[0048] 4, the gas storage tank 32 has a capacity of 10 cubic meters and a gas storage pressure of 1.6MPa. The gas pipeline 31 is a seamless steel pipe.

[0049] Operation parameters: 50rpm per minute

[0050] 5, the oil-containing water suspension liquid after dilution, heating, stirring, and adding a demulsifier is injected into the cylindrical air flotation pool (i.e. cylindrical sludge pool 1). Start the frequency conversion motor 22 at a speed of 50rpm, and start the control valve 42 at a gas supply pressure of 0.3MPa. During operation, the oil droplet foam that floats up is significantly increased compared with the fixed air injection flotation method. After 40 minutes of operation, the oil removal effect is better improved than the fixed air injection flotation method.

[0051] 6, after the operation is completed, check the air holes 242 at the lower part of the scanning radial 24, and the air holes 242 are basically not blocked.

[0052] In the description of the present application, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0053] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0054] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent process transformation using the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A rotating scanning air floatation device for chemical heat cleaning of oil-containing sludge, characterized in that: The rotating scanning air floatation device comprises a sludge pool, a rotating system, a gas conveying system and a control system, the rotating system comprises a rotating motion device and a scanning beam group for generating bubbles; The scanning beam group is located in the sludge pool, the control system controls the gas conveying system to input gas into the scanning beams (24) of the scanning beam group, and the control system controls the rotating motion device to control the rotating motion of the scanning beam group in the sludge pool.

2. The rotary scanning air floatation device for chemical heat cleaning of oily sludge according to claim 1, characterized in that: The scanning beam group comprises the scanning beams (24), the scanning beams (24) are pipes with special-shaped sections, the upper surface of the special-shaped section is a circular arc, and the lower surface of the special-shaped section is provided with a groove (241), and the bottom of the groove (241) is provided with a gas hole (242).

3. The rotary scanning air floatation device for chemical heat cleaning of oily sludge according to claim 2, characterized in that: The rotating motion device further comprises a hollow shaft (23), one end of each of the scanning beams (24) of the scanning beam group is connected to the hollow shaft (23), and the space in each scanning beam (24) is in communication with the space in the hollow shaft (23); The scanning beams (24) of the scanning beam group are uniformly and symmetrically arranged on a plane perpendicular to the hollow shaft (23).

4. The rotary scanning air floatation device for chemical heat cleaning of oily sludge according to claim 3, characterized in that: The gas holes (242) on each scanning beam (24) are non-uniformly arranged, the space interval between adjacent gas holes (242) close to the outer end of the scanning beam (24) is small, and the space interval between adjacent gas holes (242) close to the hollow shaft (23) is large.

5. The rotary scanning air flotation device for chemical heat cleaning of oil-containing sludge according to claim 1, 2, 3 or 4, characterized in that: The rotating motion device further comprises a fixed support (21) and a variable frequency motor (22) for driving the hollow shaft (23) to rotate, the fixed support (21) is installed directly above the sludge pool, the variable frequency motor (22) is installed on the fixed support (21), and the variable frequency motor (22) is connected to the hollow shaft (23).

6. The rotary scanning air floatation device for chemical heat cleaning of oily sludge according to claim 5, characterized in that: The gas conveying system comprises a gas conveying pipeline (31) and a gas storage tank (32), the gas storage tank (32) is connected to the gas conveying port (231) of the hollow shaft (23) through the gas conveying pipeline (31), and the gas storage tank (32), the gas conveying pipeline (31), the hollow shaft (23) and the scanning beams (24) are internally through, so as to form a gas passage.

7. The rotary scanning air floatation device for chemical heat cleaning of oily sludge according to claim 6, characterized in that: The control system comprises a PLC logic controller (41), a control valve (42) and a frequency converter (43), the control valve (42) is installed on the gas conveying pipeline (31), the frequency converter (43) is connected to the variable frequency motor (22), the PLC logic controller (41) is in communication connection with the frequency converter (43), and the PLC logic controller (41) is in communication connection with the control valve (42); the control valve (42) controls the on-off and the size of the gas conveying amount of the gas conveying pipeline (31).

8. The rotary scanning air floatation device for chemical heat cleaning of oily sludge according to claim 7, characterized in that: The sludge pool is cylindrical, and the length of the scanning beam (24) is less than the radius of the cylindrical sludge pool (1); The scanning beam group is installed at the bottom end of the hollow shaft (23).

9. The rotary scanning air floatation device for chemical heat cleaning of oily sludge according to claim 8, characterized in that: The scanning beam group comprises 2-30 scanning beams (24).

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