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

Abstract

The utility model provides a reciprocating scanning type air floatation device for oily sludge chemical thermal cleaning, the reciprocating scanning type air floatation device comprises a thermal cleaning pool, a reciprocating motion system, a gas transmission system and a control system, the reciprocating motion system comprises an air floatation trolley and a reciprocating motion device, and the air floatation trolley is provided with a foaming pipe group for generating bubbles; the air floating trolley is located in the hot washing pool, the control system controls the air conveying system to input air into the foaming pipe set, and the control system controls the air floating trolley to reciprocate in the hot washing pool through the reciprocating 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 reciprocating scanning type air floatation device for oily sludge chemical heat cleaning. BACKGROUND

[0002] Oily sludge refers to 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 and storage. Oily sludge is harmful to human body, plants and aquatic organisms. Oil gas evaporated in the air can stimulate the skin, eyes and respiratory organs, and make 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, and 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. It has 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 floatation, ultrasonic oscillation to enhance desorption and scraping of surface oil foam. The principle of air floatation 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 the oil-water suspension liquid more uniform, make the bubbles contact with the desorbed oil droplets in the oil-water suspension liquid more fully, and make the oil-water separation efficiency higher and the effect better become the technical problems to be solved. Utility model content

[0008] The utility model aims at providing a reciprocating scanning type air floatation device for oily sludge chemical heat cleaning, and mainly solves the problems of how to make the bubbles injected into the oil-water suspension liquid more uniform, make the bubbles contact with the desorbed oil droplets in the 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, which is: a reciprocating scanning type air floatation device for chemical hot cleaning of oily sludge, characterized in that: the reciprocating scanning type air floatation device comprises a hot washing pool, a reciprocating movement system, a gas conveying system and a control system, the reciprocating movement system comprises an air floatation trolley and a reciprocating movement device, the air floatation trolley is provided with a foaming pipe group for generating bubbles;

[0010] The air floatation trolley is located in the hot washing pool, the control system controls the gas conveying system to input gas into the foaming pipe group, and the control system controls the air floatation trolley to reciprocate in the hot washing pool through the reciprocating movement device.

[0011] Further, the foaming pipe group comprises foaming pipes, the foaming pipes are pipes with special-shaped sections, the upper surface of the special-shaped section is a circular arc, the lower surface of the special-shaped section is provided with a groove, and the groove bottom is provided with a gas hole.

[0012] Further, each foaming pipe is uniformly provided with a plurality of gas holes;

[0013] The foaming pipe group comprises a plurality of foaming pipes, the plurality of foaming pipes are uniformly and side by side installed on the air floatation trolley, and the installation direction of the foaming pipes is perpendicular to the reciprocating movement direction of the air floatation trolley.

[0014] Further, the air floatation trolley comprises a trolley frame, the trolley frame is provided below with a wheel for moving on the bottom of the hot washing pool, the foaming pipe group is installed on the trolley frame, and the trolley frame is further provided with a gas conveying port for inputting gas into the foaming pipes of the foaming pipe group;

[0015] One end of the trolley frame is connected with a tappet of the reciprocating movement device, and the other end is connected with the pool wall of the hot washing pool through a limiting spring.

[0016] Further, the reciprocating scanning type air floatation device further comprises an equipment shaft, the equipment shaft is arranged outside the end of the hot washing pool, the equipment shaft and the hot washing pool are communicated through a through hole, and a skeleton sealing ring for sealing and isolating the oil-water suspension in the hot washing pool is arranged in the through hole;

[0017] The reciprocating movement device is installed in the equipment shaft, and the tappet of the reciprocating movement device is connected with the trolley frame of the air floatation trolley in the hot washing pool through the through hole.

[0018] Further, the reciprocating movement device comprises a crankshaft, a tappet and a variable frequency motor, the variable frequency motor drives the crankshaft to rotate, the crankshaft is connected with one end of the tappet and drives the tappet to reciprocate, and the other end of the tappet is connected with the trolley frame of the air floatation trolley in the hot washing pool after passing through the through hole and the skeleton sealing ring.

[0019] Further, the stroke of the tappet of the reciprocating movement device is greater than the arrangement spacing of the foaming pipes in the foaming pipe group.

[0020] Further, the gas conveying system comprises a gas conveying pipeline and a gas storage tank, the gas storage tank is located outside the equipment shaft, the gas storage tank is connected with the gas conveying port through the gas conveying pipeline, the gas storage tank, the gas conveying pipeline and the foaming pipe are internally connected to form a gas conveying channel.

[0021] Further, the control system comprises a PLC logic controller, a control valve and a frequency converter, the PLC logic controller, the frequency converter and the control valve are located outside the equipment shaft, the control valve is installed on the gas conveying pipeline, the frequency converter is connected with the variable frequency motor, the PLC logic controller is in communication connection with the frequency converter, and the PLC logic controller is in communication connection with the control valve; the control valve controls the on-off of the gas conveying pipeline and the size of the gas conveying amount.

[0022] Further, the hot washing pool is a rectangular hot washing pool.

[0023] The depth of the rectangular hot washing pool is the same as the depth of the equipment shaft.

[0024] The air floatation trolley is installed at the bottom of the rectangular hot washing pool, the frame of the air floatation trolley is rectangular, and there is a gap between the air floatation trolley and the four walls of the rectangular hot washing pool.

[0025] The length of the foaming pipe is smaller than the width of the corresponding air floatation trolley frame.

[0026] In view of the above technical features, the utility model has the following beneficial effects:

[0027] 1. The reciprocating scanning air floatation device for chemical hot washing of oily sludge, by setting the reciprocating motion device, the air floatation trolley realizes reciprocating motion in the hot washing pool, the foaming pipe group simultaneously realizes foaming and reciprocating motion at the bottom of the pool, the bubbles in the injected oily sludge suspension (i.e. oil-water suspension) are more uniform, the bubbles contact the suspension (i.e. the oil droplets in the oil-water suspension) more fully, the mixture is more uniform, the oil-water separation efficiency is higher, and the effect is better. Compared with the existing fixed air floatation injection device, the reciprocating scanning air floatation device of the utility model can absorb more oil droplets by using the same bubble size and gas amount.

[0028] 2. The reciprocating scanning air floatation device for chemical hot washing of oily sludge, the foaming pipe is a foaming pipe with a built-in air hole, which can reduce or lower the blockage of the air hole of the foaming pipe caused by the settlement or collision of particles in the oil-water suspension, and the foaming air floatation effect is better. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structure diagram of a reciprocating scanning air floatation device for chemical hot washing of oily sludge in embodiment 1 Figure 1 (side view angle);

[0030] Figure 2is a structure diagram of a reciprocating scanning air floatation device for chemical and thermal cleaning of oily sludge in embodiment 1 Figure 2 (overhead angle);

[0031] Figure 3 is a structure diagram of a foaming pipe in embodiment 1 (cross section).

[0032] In the figure: 1, rectangular thermal washing pool; 11, through hole;

[0033] 2, equipment shaft;

[0034] 31, air floatation trolley; 311, trolley frame; 312, wheel; 313, foaming pipe; 314, gas inlet port; 315, groove; 316, air hole; 32, reciprocating motion device; 33, variable frequency motor; 34, limiting spring; 35, crankshaft;

[0035] 41, gas conveying pipeline; 42, gas storage tank;

[0036] 51, PLC logic controller; 52, control valve; 53, frequency converter. DETAILED DESCRIPTION

[0037] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not used to limit the scope of the present application. In addition, it should be understood that after reading the content taught by the present application, those skilled in the art can make various changes or modifications to the present application, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0038] Referring to Figures 1 to 3 , embodiment 1 provides a reciprocating scanning air floatation device for chemical and thermal cleaning of oily sludge, which comprises a thermal washing pool, a reciprocating motion system, a gas conveying system and a control system, the reciprocating motion system comprises an air floatation trolley 31 and a reciprocating motion device 32, the air floatation trolley 31 is provided with a foaming pipe group for generating bubbles. The thermal washing pool is a rectangular thermal washing pool.

[0039] The air floatation trolley 31 is located in the thermal washing pool, the control system controls the gas conveying system to input gas into the foaming pipe group, the control system controls the air floatation trolley 31 to reciprocate in the thermal washing pool through the reciprocating motion device 32, so as to realize the reciprocating motion of the foaming pipe group, when the foaming pipe group reciprocates, a bubble string group generated by the compressed gas injected into the pool through the foaming pipe group performs upward and reciprocating compound motion (similar to scanning, so it is called "reciprocating scanning air floatation device") in the oil-water suspension pool, 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 thermal washing pool) are more uniform, the bubbles contact the oil-water suspension more fully, the oil-water separation efficiency is higher, and the effect is better.

[0040] The foaming pipe group comprises foaming pipes 313, which are pipes with special-shaped cross sections, the upper surface of the special-shaped cross section is circular arc-shaped, the lower surface of the special-shaped cross section is provided with a groove 315, and the bottom of the groove 315 is provided with a gas hole 316, that is, a concealed gas hole 316. The foaming pipe 313 in this embodiment 1 is in a long strip shape, the bottom is provided with a strip-shaped groove 315, and the bottom of the groove 315 is uniformly provided with a gas hole 316 (such as a small gas-permeable hole 316), so that the cross section of the foaming pipe 313 presents a special-shaped cross section. During the reciprocating movement of the foaming pipe 313, the particles in the oil-water suspension liquid cannot block the gas hole 316 of the foaming pipe 313 due to sedimentation or stirring collision.

[0041] Each foaming pipe 313 is uniformly provided with a plurality of gas holes 316; the foaming pipe group comprises a plurality of foaming pipes 313, the plurality of foaming pipes 313 are uniformly and side by side installed on the air float trolley 31, and the installation direction of the foaming pipe 313 is perpendicular to the reciprocating movement direction of the air float trolley 31.

[0042] The air float trolley 31 comprises a frame 311, such as a rectangular steel frame structure, in order to cooperate with the rectangular hot washing tank 1, so as to ensure that the floating trolley can reciprocate in the rectangular hot washing tank 1, and can uniformly inject bubbles into each part of the rectangular hot washing tank 1.

[0043] The frame 311 is provided below with a wheel 312 for moving at the bottom of the hot washing tank, the foaming pipe group is installed on the frame 311, and the frame 311 is further provided with a gas inlet port 314 for inputting gas to the foaming pipe 313 of the foaming pipe group.

[0044] The air float trolley 31 is installed at the bottom of the rectangular hot washing tank 1, the frame 311 of the air float trolley 31 is in a rectangular shape, and there is a gap between the air float trolley 31 and the four walls of the rectangular hot washing tank 1; the length of the foaming pipe 313 is less than the width of the corresponding frame 311 of the air float trolley 31.

[0045] One end of the frame 311 is connected with a tappet of the reciprocating movement device 32, and the other end is connected with the pool wall of the rectangular hot washing tank 1 through a limiting spring 34, the limiting spring 34 is used to prevent the frame 311 and the pool wall of the rectangular hot washing tank 1 from colliding, and buffer the reciprocating inertia of the air float trolley 31.

[0046] The reciprocating scanning air float device further comprises a device shaft 2, the device shaft 2 is arranged outside the end of the hot washing tank, the device shaft 2 and the hot washing tank are communicated through a through hole 11, and the through hole 11 is provided with a skeleton sealing ring for sealing and isolating the oil-water suspension liquid in the hot washing tank. The depth of the rectangular hot washing tank 1 is the same as the depth of the device shaft 2.

[0047] The reciprocating device 32 is installed in the equipment shaft 2, and the tappet of the reciprocating device 32 is connected with the frame 311 of the air floatation trolley 31 in the hot washing pool through the through hole 11. Specifically, the reciprocating device 32 comprises a crankshaft 35, a tappet and a variable frequency motor 33, the variable frequency motor 33 drives the crankshaft 35 to rotate, the crankshaft 35 is connected with one end of the tappet and drives the tappet to reciprocate, and the other end of the tappet is connected with the frame 311 of the air floatation trolley 31 in the hot washing pool after passing through the through hole 11 and the skeleton sealing ring. The variable frequency motor 33 is installed in the equipment shaft 2 and provides power for the reciprocating device 32.

[0048] The stroke of the tappet of the reciprocating device 32 is greater than the arrangement interval of the foaming pipes 313 in the foaming pipe group, so that the bubble string generated by the foaming pipes 313 can completely scan the corresponding upper space.

[0049] The gas conveying system comprises a gas conveying pipeline 41 and a gas storage tank 42, the gas storage tank 42 is located outside the equipment shaft 2, the gas storage tank 42 is connected with the gas conveying port 314 (i.e. the gas storage tank 42 is connected with the foaming pipe 313 on the air floatation trolley 31 in the hot washing pool through the gas conveying pipeline) through the gas conveying pipeline 41, and the gas storage tank 42, the gas conveying pipeline 41 and the foaming pipe 313 are internally connected to form a gas conveying channel.

[0050] The control system comprises a PLC logic controller 51, a control valve 52 and a frequency converter 53, the PLC logic controller 51, the frequency converter 53 and the control valve 52 are all located outside the equipment shaft 2, the control valve 52 is installed on the gas conveying pipeline 41, the frequency converter 53 is connected with the variable frequency motor 33, the PLC logic controller 51 is in communication connection with the frequency converter 53, and the PLC logic controller 51 is in communication connection with the control valve 52. The control valve 52 is used for controlling the on-off and the size of the gas conveying amount of the gas conveying pipeline 41.

[0051] The PLC logic controller 51 can control the rotating speed of the variable frequency motor 33, the reciprocating scanning speed is controlled through the rotating speed of the variable frequency motor 33, the PLC logic controller 51 also controls the compressed air amount input into the foaming pipe 313 through the control valve 52, and the air floatation efficiency and effect during the hot washing of the oil-containing water suspension are adjusted through the control of the reciprocating scanning rotating speed and the air amount injected into the pool.

[0052] The operation process of the reciprocating scanning type air floatation device for chemical hot washing of oil-containing sludge:

[0053] (1) After the reciprocating scanning type air 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 51.

[0054] (2) The oil-water suspension liquid diluted and demulsified is injected into the rectangular hot washing pool 1.

[0055] (3) Start the power supply, PLC logic controller 51 sends command signals to the frequency conversion motor 33 and control valve 52, the frequency conversion motor 33 starts to operate according to the received speed command, drives the crankshaft 35 of the reciprocating device 32 to rotate, and the crankshaft 35 drives the tappet of the reciprocating device 32 to make linear reciprocating motion; the tappet drives the air float car 31 to make reciprocating motion at the bottom of the hot washing pool, and the corresponding foaming pipe group reciprocates at the bottom of the hot washing pool.

[0056] At the same time, the control valve 52 is opened according to the received command opening, the compressed gas in the gas storage tank 42 enters the foaming pipe group through the control valve 52 and the gas conveying pipeline 41, and enters the suspension pool (i.e. the rectangular hot washing pool 1) through the air holes 316 of the foaming pipes 313 of the foaming pipe group. When the foaming pipe group reciprocates, the bubble string group generated by the compressed gas injected into the pool through the foaming pipe group performs upward and reciprocating compound motion (similar to scanning) in the oil-water suspension pool, and adsorbs the oil droplets in the suspension to rise to the liquid surface.

[0057] For example, taking a rectangular concrete oil hot washing pool with a length of 4m, a width of 3m and a depth of 1.8m as an example, the following is explained: 1. A device shaft 2 with a width of 3m, a length of 1.5m and a depth of 1.8m is arranged at the end of the hot washing pool. The distance between the device shaft 2 and the hot washing pool is 50cm.

[0058] 2. The specifications of the air float car 31 are: length 3.6m, width 2.8m. The frame 311 is made of Q235 square tube with a side length of 100mm and a wall thickness of 5mm.

[0059] 3. A single-cylinder BW plunger pump is selected as the reciprocating device 32, the pump head is removed, and the tappet of the plunger pump is lengthened by 80cm. The tappet stroke is 100mm.

[0060] 4. The foaming pipe 313 is made of seamless steel pipe with a diameter of 25mm, a wall thickness of 3.0mm and a material of Q345 steel. The length of a single foaming pipe 313 is 2.8m. The arrangement interval of the foaming pipes 313 is 25mm.

[0061] 5. The motor is a 7.5kw frequency conversion motor 33, the PLC is a Siemens S7-200 type, and the frequency converter 53 is a Hui Chuan MD280 type. The communication mode is 485 communication.

[0062] 6. The gas storage tank 42 has a capacity of 10 cubic meters and a gas storage pressure of 1.6MPa. The gas conveying pipeline 41 is made of pressure-resistant rubber pipe.

[0063] 7. The reciprocating motion parameters are: 50rpm per minute.

[0064] 8. The oil-containing water suspension treated by dilution, heating stirring, adding demulsifier, etc. is injected into the square air flotation tank (i.e. rectangular hot washing tank 1). The variable frequency motor 33 is started, and the rotating speed is 50 rpm. At the same time, the control valve 52 is started, and the gas injection pressure is 0.3 MPa. During the operation, the oil droplet foam floating up is obviously increased compared with the fixed air injection flotation method. After 40 minutes of operation, the oil removal effect is better than that of the fixed air injection flotation method.

[0065] 9. After the operation is finished, the air holes 316 at the lower part of the foaming pipe 313 are checked. The air holes 316 are basically not blocked.

[0066] In the description of the present application, it should 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.

[0067] 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 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.

[0068] The above only describes the preferred embodiments of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge, characterized in that: The reciprocating scanning air flotation device includes a hot washing tank, a reciprocating motion system, an air supply system and a control system. The reciprocating motion system includes an air flotation trolley (31) and a reciprocating motion device (32). The air flotation trolley (31) is equipped with a foaming tube assembly for generating bubbles. The air flotation trolley (31) is located in the hot washing tank. The control system controls the gas supply system to input gas into the foaming tube group. The control system controls the air flotation trolley (31) to reciprocate in the hot washing tank through the reciprocating motion device (32).

2. The reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to claim 1, characterized in that: The foam tube assembly includes a foam tube (313), which is a pipe with an irregular cross-section. The upper surface of the irregular cross-section is arc-shaped, and the lower surface of the irregular cross-section is provided with a groove (315). The bottom of the groove (315) is provided with an air hole (316).

3. The reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to claim 2, characterized in that: Each foam tube (313) is evenly provided with several air holes (316); The foam tube assembly includes several foam tubes (313), which are evenly and side by side installed on the air flotation trolley (31). The installation direction of the foam tubes (313) is perpendicular to the reciprocating motion direction of the air flotation trolley (31).

4. The reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to claim 3, characterized in that: The air flotation trolley (31) includes a frame (311), wheels (312) for moving at the bottom of the hot washing tank are provided below the frame (311), the foaming tube assembly is installed on the frame (311), and the frame (311) is also provided with an air supply port (314) for inputting gas into the foaming tube (313) of the foaming tube assembly. One end of the frame (311) is connected to the pushrod of the reciprocating motion device (32), and the other end is connected to the wall of the hot washing pool through the limiting spring (34).

5. A reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to any one of claims 1 to 4, characterized in that: The reciprocating scanning air flotation device also includes an equipment shaft (2), which is located outside the end of the hot washing tank. The equipment shaft (2) and the hot washing tank are connected through a through hole (11). The through hole (11) is provided with a skeleton sealing ring for sealing and isolating the oil-water suspension in the hot washing tank. The reciprocating motion device (32) is installed in the equipment shaft (2), and the push rod of the reciprocating motion device (32) is connected to the frame (311) of the air flotation trolley (31) in the hot washing tank through the through hole (11).

6. The reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to claim 5, characterized in that: The reciprocating motion device (32) includes a crankshaft (35), a tappet, and a variable frequency motor (33). The variable frequency motor (33) drives the crankshaft (35) to rotate. The crankshaft (35) is connected to one end of the tappet and drives the tappet to reciprocate. The other end of the tappet passes through the through hole (11) and the skeleton sealing ring and is connected to the frame (311) of the air flotation trolley (31) in the hot washing tank.

7. The reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to claim 6, characterized in that: The stroke of the push rod of the reciprocating motion device (32) is greater than the spacing between the foam tubes (313) in the foam tube group.

8. A reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to claim 1, 2, 3, 4, 6, or 7, characterized in that: The gas transmission system includes a gas transmission pipeline (41) and a gas storage tank (42). The gas storage tank (42) is located outside the equipment shaft (2). The gas storage tank (42) is connected to the gas transmission port (314) through the gas transmission pipeline (41). The gas storage tank (42), the gas transmission pipeline (41) and the foaming pipe (313) are interconnected to form a gas transmission channel.

9. The reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to claim 8, characterized in that: The control system includes a PLC logic controller (51), a control valve (52), and a frequency converter (53). The PLC logic controller (51), the frequency converter (53), and the control valve (52) are all located outside the equipment shaft (2). The control valve (52) is installed on the gas pipeline (41). The frequency converter (53) is connected to the variable frequency motor (33). The PLC logic controller (51) is connected to the frequency converter (53) and the control valve (52) is connected to the control valve. The control valve (52) controls the opening and closing of the gas pipeline (41) and the amount of gas delivered.

10. The reciprocating scanning air flotation device for chemical thermal cleaning of oily sludge according to claim 9, characterized in that: The hot washing tank is a rectangular hot washing tank (1); The depth of the rectangular hot washing tank (1) is the same as the depth of the equipment shaft (2); The air flotation trolley (31) is installed at the bottom of the rectangular hot washing tank (1). The frame (311) of the air flotation trolley (31) is rectangular, and there are gaps between the air flotation trolley (31) and the four walls of the rectangular hot washing tank (1). The length of the foam tube (313) is less than the width of the corresponding air flotation trolley (31) frame (311).

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