CN114618335A - Slidable rigid-flexible combined stirring paddle for strengthening deoiling of oil sludge - Google Patents
Slidable rigid-flexible combined stirring paddle for strengthening deoiling of oil sludge Download PDFInfo
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- CN114618335A CN114618335A CN202111396023.5A CN202111396023A CN114618335A CN 114618335 A CN114618335 A CN 114618335A CN 202111396023 A CN202111396023 A CN 202111396023A CN 114618335 A CN114618335 A CN 114618335A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
Abstract
The invention discloses a slidable rigid-flexible combined stirring paddle for strengthening deoiling of oil sludge. The stirring device is formed by connecting a rigid stirring paddle fixed on a stirring shaft and a connecting device capable of sliding on the stirring shaft with a flexible sheet through a circular ring. The stirring paddle is driven by the motor to rotate in the stirring tank, so that fluid mixing is enhanced, and the mass transfer behavior of the oil sludge deoiling process is enhanced. The flexible sheet can continuously shake or move in multiple bodies under the interaction of the stirring paddle and the fluid, so that the flow field regular area is disturbed, the size and the position of the regular area are continuously adjusted, the turbulence degree of the fluid in the stirring tank is increased, the energy transfer process and the contact behavior of the fluid and a solid phase are strengthened, and the oil sludge deoiling efficiency is improved.
Description
Technical Field
The invention relates to a stirring paddle of a stirring device in the treatment of oil sludge by a chemical hot washing method, in particular to a slidable rigid-flexible combined stirring paddle for strengthening oil sludge deoiling.
Background
The method for treating the oil sludge by chemical hot washing needs to use a stirring device. The stirring device is a core device for increasing the permeability and wettability of water to oil sludge and improving the separation effect of three phases of oil, water and sludge. Stirring can promote the removal of oil from the solid surface and the decomposition of the oil phase into oil droplets, thereby achieving the effect of separating and removing the oil phase from the solid phase. Most of the stirring devices for treating the oil sludge by the chemical hot washing method are two-blade rigid stirring paddles.
Research shows that the traditional rigid paddle has poor axial mixing, a chaotic mixing region and a mixed isolation region are easily formed in a flow field, and a stable flow field structure interface exists between the chaotic mixing region and the mixed isolation region, so that the effective contact area of solid and liquid phases is small. In addition, due to the symmetry of the flow field structure in the stirring tank, most of the energy of the stirring paddle is positioned at the edge of the stirring paddle and the wake vortex behind the stirring paddle.
The flexible body can form a vortex structure which is obviously different from that of the rigid paddle in the flow field, the internal and external structure interfaces of the mixed isolation region in the flow field can be damaged, the chaotic mixing behavior of the fluid is strengthened, and the fluid mixing effect is improved. Researches show that the rigid-flexible combined paddle not only has the shearing effect of a rigid paddle, but also has the multi-body movement of a flexible body, and the fluid mixing efficiency is improved through the rigid-flexible-flow coupling effect.
In order to overcome the defects of a traditional stirring device used for treating oil sludge by a chemical hot washing method, two adjacent layers of rigid paddle blades are correspondingly connected by using flexible sheets, the length and the curvature of each flexible sheet are regulated and controlled by regulating and controlling a connecting device, the contact behavior of fluid and a solid phase is strengthened, the oil sludge deoiling time is shortened, and the oil sludge deoiling efficiency is improved.
Disclosure of Invention
The invention aims to provide a slidable rigid-flexible combined stirring paddle for strengthening oil sludge deoiling, which is characterized by comprising a stirring shaft (2), at least one sliding blade group (4), a fixed blade group (40) and a plurality of flexible sheets (6);
the sliding paddle group (4) comprises a shaft sleeve I (402) and rigid paddle blades I (401) which are radially connected to the periphery of the shaft sleeve I (402);
the fixed paddle group (40) comprises a shaft sleeve II (4002) and rigid paddle blades II (4001) which are radially connected to the periphery of the shaft sleeve II (4002);
the upper end of the stirring shaft (2) is connected with a motor; a shaft sleeve I (402) of the sliding blade group (4) is sleeved on the stirring shaft (2); the lower end of the stirring shaft (2) is fixedly connected with a shaft sleeve II (4002) of the fixed paddle group (40);
the number of the flexible sheets (6) is equal to the number of the rigid paddle blades I (401);
when only one sliding paddle blade group (4) is provided, each rigid paddle blade I (401) is connected with one rigid paddle blade II (4001) through one flexible sheet (6);
when more than one sliding paddle group (4) is provided, each rigid paddle blade I (401) of the sliding paddle group (4) at the lowest layer is connected with one rigid paddle blade II (4001) through one flexible sheet (6); each rigid paddle blade I (401) of the rest sliding paddle groups (4) is connected with one rigid paddle blade I (401) of the lower sliding paddle group (4) through one flexible sheet (6).
Further, when only one sliding paddle group (4) is provided, the number of the rigid paddle blades I (401) is equal to that of the rigid paddle blades II (4001); when there is more than one sliding blade set (4), the number of rigid blades I (401) of each sliding blade set (4) is equal to the number of rigid blades II (4001) of the fixed blade set (40).
Further, the shaft sleeve I (402) slides freely on the stirring shaft (2); the shaft sleeve I (402) is provided with a device for locking the shaft sleeve I (402) to rotate; the shaft sleeve I (402) is provided with a device for locking the shaft sleeve I (402) to slide;
further, the rigid paddle blade I (401) is connected to the shaft sleeve I (402) in an inclined mode of 45-75 degrees; the rigid paddle blade II (4001) is connected to the shaft sleeve II (4002) in an inclined mode at an angle of 45-75 degrees.
Further, one end, far away from the shaft sleeve I (402), of the rigid paddle blade I (401) is in a circular arc shape; one end of the rigid paddle blade II (4001) far away from the shaft sleeve II (4002) is arc-shaped;
furthermore, two ends of each flexible sheet (6) are respectively connected with a circular ring (5); the rigid paddle blade I (401) is connected with the flexible sheet (6) through the circular ring (5); the rigid paddle blade II (4001) is connected with the flexible sheet (6) through the circular ring (5); one end of each blade of each rigid stirring paddle (4) is connected with the connecting device (7), the other end of each blade is provided with a through hole, and a circular ring (5) is connected in each through hole; two ends of the long edge of each flexible sheet (6) are respectively provided with a through hole; the ends of the rigid paddle blade I (401) and the rigid paddle blade II (4001) are provided with through holes for the circular ring (5) to pass through; the diameters of through holes at one ends of the rigid paddle blade I (401) and the rigid paddle blade II (4001) and the diameters d of through holes at two ends of the long edge of the flexible sheet (6) are 1-4 mm.
Further, the flexible sheet (6) is rectangular. The thickness T of the flexible sheet (6) is 0.8-2 mm, and the width W is 8-12 mm.
Further, the natural extension length of the flexible sheet (6) is L; the shaft sleeve I (402) is provided with a limiting device for limiting the shaft sleeve I (402) to slide downwards; the vertical distance between the sliding blade group (4) and the fixed blade group (40) is S, and S is (0.45-1.0) multiplied by L; when there is more than one sliding blade group (4), the vertical distance between adjacent sliding blade groups (4) is S, where S is (0.45-1.0) × L.
Further, the horizontal length of the rigid paddle blade I (401) and the rigid paddle blade II (4001) is Q, and W is (0.32 to 0.48) × Q; the diameter of a swept area of the sliding blade group (4) is D, and W is (0.1-0.15) multiplied by D.
Further, the diameter of the ring (5) is phi, and phi is (0.12-0.24) multiplied by Q; the height of the stirring tank (3) is h, the distance between the rigid paddle blade II (4001) and the bottom of the stirring tank (3) is d, and d is (0.1-0.2) x h.
The technical effect of the invention is undoubtedly that the invention combines a rigid stirring paddle with a cutting effect on the fluid and a flexible sheet with a disturbance effect on the fluid to form a rigid-flexible combined stirring paddle. The thickness and width of the flexible sheet are sized to ensure that whipping can occur during the mixing process but the dispersing ability is not too weak. The cross-scanning range of the paddle and the cross-sectional area of the cross-scanning fluid are maximized on the premise that the resistance and power consumption of the flexible sheet are reduced as much as possible, so that the flow effect of the fluid near the paddle area is improved, the turbulence degree of the fluid in the stirring tank is increased, the energy transfer process and the contact behavior of the fluid and a solid phase are strengthened, the oil sludge deoiling time is shortened, and the oil sludge deoiling efficiency is improved.
Drawings
FIG. 1 is a schematic view of a slidable rigid-flexible composite stirring paddle of the present invention positioned within a stirring device;
FIG. 2 is a schematic view of a slidable rigid-flexible combined stirring paddle according to the present invention.
In the figure: the stirring device comprises a motor (1), a stirring shaft (2), a sliding paddle set (4), a rigid paddle blade I (401), a shaft sleeve I (402), a fixed paddle set (40), a rigid paddle blade II (4001), a shaft sleeve II (4002), a rigid stirring paddle (4), a circular ring (5) and a flexible sheet (6).
Detailed Description
The present invention is further illustrated by the following examples, but it should not be construed that the scope of the above-described subject matter is limited to the following examples. Various substitutions and modifications can be made without departing from the technical idea of the invention and the scope of the invention according to the common technical knowledge and the conventional means in the field.
Example 1:
a slidable rigid-flexible combined stirring paddle for strengthening oil sludge deoiling is characterized by comprising a stirring shaft 2, at least one sliding blade group 4, a fixed blade group 40 and a plurality of flexible sheets 6;
the sliding blade group 4 comprises a shaft sleeve I402 and rigid blade pieces I401 radially connected to the periphery of the shaft sleeve I402;
the fixed blade group 40 comprises a shaft sleeve II4002 and rigid blade pieces II4001 radially connected to the periphery of the shaft sleeve II 4002;
the upper end of the stirring shaft 2 is connected with a motor; a shaft sleeve I402 of the sliding blade group 4 is sleeved on the stirring shaft 2; the lower end of the stirring shaft 2 is fixedly connected with a shaft sleeve II4002 of the fixed blade group 40;
the number of the flexible sheets 6 is equal to the number of the rigid paddle sheets I401;
when only one sliding paddle group 4 is arranged, each rigid paddle blade I401 is connected with one rigid paddle blade II4001 through one flexible sheet 6;
when more than one sliding blade group 4 is provided, each rigid blade I401 of the sliding blade group 4 at the lowest layer is connected with one rigid blade II4001 through one flexible sheet 6; each rigid paddle blade I401 of the other sliding paddle groups 4 is connected with one rigid paddle blade I401 of the lower sliding paddle group 4 through one flexible sheet 6.
In the embodiment, only one sliding paddle group 4 is provided, and the number of the rigid paddle blades I401 is equal to that of the rigid paddle blades II 4001;
one end of the rigid paddle blade I401, which is far away from the shaft sleeve I402, is in a circular arc shape; one end of the rigid paddle blade II4001, which is far away from the shaft sleeve II4002, is in a circular arc shape; the rigid paddle blade I401 is connected to the shaft sleeve I402 in an inclined mode of 60 degrees; the rigid paddle blade II4001 is connected to the shaft sleeve II4002 in an inclined mode of 60 degrees.
The shaft sleeve I402 can freely slide on the stirring shaft 2; a limiting device for limiting the sliding and rotating of the shaft sleeve I402 is arranged on the shaft sleeve I402; in an embodiment, a latch may be provided on the sleeve I402 for locking. Or, a radial threaded through hole may be formed in the shaft sleeve I402, and a fastening bolt is screwed into the threaded through hole, so that the shaft sleeve I402 and the stirring shaft 2 are fixed together.
Two ends of each flexible sheet 6 are respectively connected with a circular ring 5; the rigid paddle blade I401 is connected with the flexible sheet 6 through the circular ring 5; the rigid paddle blade II4001 is connected with the flexible sheet 6 through the circular ring 5;
one end of each blade of each rigid stirring paddle 4 is connected with a connecting device 7, the other end of each blade is provided with a through hole, and a circular ring 5 is connected in each through hole;
two ends of the long edge of each flexible sheet 6 are respectively provided with a through hole;
the ends of the rigid paddle piece I401 and the rigid paddle piece II4001 are provided with through holes for the circular ring 5 to pass through;
when the natural straightening length L of the flexible sheet 6 is too short, the 'transverse sweeping' range of the paddle is reduced, the shaking behavior of the spring is weakened, and the energy of the paddle is difficult to be transferred to a far place of a flow field; when the natural extension length L of the flexible sheet 6 is too long, the 'transverse scanning' range of the paddle is increased, the shaking behavior of the spring is increased, but the resistance borne by the flexible sheet is increased. Because the connecting device 7 can freely slide on the stirring shaft 2, the distance S between the lower edge of the upper layer rigid stirring paddle 4 and the upper edge of the upper layer rigid stirring paddle 4 can be adjusted according to actual needs.
Example 2:
the main structure of this embodiment is the same as that of embodiment 1, and further, the diameter of the through hole at one end of each of the rigid paddle I401 and the rigid paddle II4001 and the diameter d of the through hole at the two ends of the long side of the flexible sheet 6 are 1 mm. The flexible sheet 6 is rectangular. The flexible sheet 6 has a thickness T of 0.8mm and a width W of 8 mm.
The natural straightening length of the flexible sheet 6 is L; the shaft sleeve I402 is provided with a limiting device for limiting the shaft sleeve I402 to slide and rotate; the vertical distance between the sliding blade group 4 and the fixed blade group 40 is S, and S is 0.45L;
the length of the rigid paddle piece I401 and the rigid paddle piece II4001 in the horizontal direction is Q, and W is 0.32Q;
the diameter of the area swept by the sliding blade group 4 is D, and W is 0.1D.
The diameter of the circular ring 5 is phi, and phi is 0.12Q;
the height of the stirring tank 3 is h, the distance between the rigid paddle blade II4001 and the bottom of the stirring tank 3 is d, and d is 0.1 h.
In this embodiment, the rigid paddle blade I401 is adjusted according to the height of the test material, and the rigid paddle blade I401 is entirely submerged in the test material.
Example 3:
the main structure of this embodiment is the same as that of embodiment 1, and further, the diameter of the through hole at one end of each of the rigid paddle I401 and the rigid paddle II4001 and the diameter d of the through hole at the two ends of the long side of the flexible sheet 6 are 4 mm. The rigid paddle piece I401 inclines by 60 degrees, and the rigid paddle piece II4001 inclines by 60 degrees
The flexible sheet 6 is rectangular. The flexible sheet 6 has a thickness T of 2mm and a width W of 12 mm.
The natural straightening length of the flexible sheet 6 is L; the vertical distance between the sliding blade group 4 and the fixed blade group 40 is S, and S is L;
the present embodiment has more than one sliding blade group 4, and the vertical distance between adjacent sliding blade groups 4 is S, and S is L.
The length of the rigid paddle piece I401 and the rigid paddle piece II4001 in the horizontal direction is Q, and W is 0.48Q;
the diameter of the area swept by the sliding blade group 4 is D, and W is 0.15D.
The diameter of the circular ring 5 is phi, and phi is 0.24Q;
the height of the stirring tank 3 is h, the distance between the rigid paddle blade II4001 and the bottom of the stirring tank 3 is d, and d is 0.2 h.
Experiment:
this experiment adopts above-mentioned just gentle combination stirring rake of slidable of reinforceing fatlute deoiling, its characterized in that includes (mixing) shaft, rigid stirring rake, ring, connecting device and the flexible piece that links to each other with the motor.
6 groups of untreated oil sludge samples are collected, and the water content, the oil content and the mud content are calculated.
Water content: the weight loss rate of the oil sludge after being dried at 105 ℃.
Oil content: the ratio of the mass difference value after being calcined at 450 ℃ after being dried at 105 ℃ to the mass of the oil sludge.
The mud content: the mass ratio of the oil sludge after being calcined at 450 ℃ to the oil sludge before being calcined.
TABLE 1 Water content, oil content and sludge content of the sludge as it is
As can be seen from the data in Table 1, there is a certain difference in the oil content of the oil sludge at different sampling points. If the oil product in the oil sludge can be recovered after the hot washing, the method has certain economic value.
The following experiment was performed using the apparatus in example 1.
The specific values are as follows:
(1) the diameter of the through hole at one end of the rigid stirring paddle 4 and the diameter d of the through hole at the two ends of the long edge of the flexible sheet 6 are 2 mm.
(2) The flexible sheet 6 has a thickness T of 1mm, a width W of 10mm,
it should be noted that the thickness of the flexible sheet 6 cannot be lower than 0.5mm, and should have an upper limit value to ensure that the jitter can occur but the dispersion ability is not too weak;
when the width W of the flexible sheet 6 is too small, the cross-sectional area for the fluid to "sweep" is reduced, and the amount of fluid that can move is reduced; uniform mixing of the fluids is difficult to achieve;
when the width W of the flexible sheet 6 is too large, the cross-sectional area "swept" by the fluid increases, increasing the amount of fluid that can move, but the resistance experienced by the flexible sheet increases.
(3) In an initial state, the length of the flexible sheet 6 stretched naturally is L, L is 100mm, and in the two adjacent layers of rigid stirring paddles 4, the distance between the lower edge of the upper layer of rigid stirring paddle 4 and the upper edge of the upper layer of rigid stirring paddle 4 is S, L is (1.2-1.8) × S, and S is 60 mm.
Because the connecting device 7 can freely slide on the stirring shaft 2, the distance S between the lower edge of the upper layer rigid stirring paddle 4 and the upper edge of the upper layer rigid stirring paddle 4 can be adjusted according to actual needs.
(4) The rigid stirring paddle 4 has a paddle length of Q, W is (0.32 to 0.48) × Q, and Q is 26 mm.
(5) The diameter of the rigid stirring paddle 4 is D, W is (0.1-0.15) multiplied by D, and D is 80 mm.
Research shows that when the width W of the flexible sheet 6 is too small, the spring is beneficial to torsion or vibration, but the energy transfer capability is poor;
when the width W of the flexible sheet 6 is too large, the spring is not favorable to torsion or shake, but the energy transmission capability is strong.
(6) The diameter of the circular ring 5 is phi, the length of the paddle of the rigid stirring paddle 4 is Q, and phi is (0.12-0.24) multiplied by Q, and phi is 5 mm.
The stirring shaft is driven by a motor 1 and extends into the stirring tank 3 to rotate.
The stirring tank 3 is a cylindrical open stirring tank, the diameter of the tank is 0.12m, and the height of the tank is 0.15 m;
150g of untreated oil sludge is filled in the stirring tank 3, 600mL of cleaning solution is added into the stirring tank, and the stirring speed is 210 rpm;
the oil removal efficiency of the stirring paddle is represented by measuring the cleaning time of the oil sludge and the final oil residue rate. The results are shown in tables 2 and 3.
TABLE 2 sludge cleaning time and Final oil yield for the original single-layer rigid paddle system
TABLE 3 sludge Wash time and Final residual oil Rate for a slidable rigid-Flexible combination Agitator System according to the invention
From the experimental results in tables 2 and 3, it can be seen that under the same other experimental conditions, compared with the original single-layer rigid stirring paddle, the slidable rigid-flexible combined stirring paddle disclosed by the invention can significantly shorten the oil removal time of oil sludge debris and reduce the residual oil rate, the residual oil rate of the oil sludge is reduced by 3.51%, and the cleaning time is reduced by 66.7%.
Claims (10)
1. A slidable rigid-flexible combined stirring paddle for strengthening oil sludge deoiling is characterized by comprising a stirring shaft (2), at least one sliding blade group (4), a fixed blade group (40) and a plurality of flexible sheets (6);
the sliding paddle group (4) comprises a shaft sleeve I (402) and rigid paddle blades I (401) which are radially connected to the periphery of the shaft sleeve I (402);
the fixed paddle blade group (40) comprises a shaft sleeve II (4002) and rigid paddle blades II (4001) which are connected to the periphery of the shaft sleeve II (4002) in a radial mode;
the upper end of the stirring shaft (2) is connected with a motor; a shaft sleeve I (402) of the sliding blade group (4) is sleeved on the stirring shaft (2); the lower end of the stirring shaft (2) is fixedly connected with a shaft sleeve II (4002) of the fixed blade group (40);
the number of the flexible sheets (6) is equal to the number of the rigid paddle blades I (401);
when only one sliding paddle blade group (4) is provided, each rigid paddle blade I (401) is connected with one rigid paddle blade II (4001) through one flexible sheet (6);
when more than one sliding blade group (4) is provided, each rigid blade I (401) of the sliding blade group (4) at the lowest layer is connected with one rigid blade II (4001) through one flexible sheet (6); each rigid paddle blade I (401) of the rest sliding paddle groups (4) is connected with one rigid paddle blade I (401) of the lower sliding paddle group (4) through one flexible sheet (6).
2. The sliding rigid-flexible combined stirring paddle for strengthening oil sludge deoiling of claim 1, wherein: when only one sliding paddle group (4) is provided, the number of the rigid paddle blades I (401) is equal to that of the rigid paddle blades II (4001);
when there is more than one sliding blade set (4), the number of rigid blades I (401) of each sliding blade set (4) is equal to the number of rigid blades II (4001) of the fixed blade set (40).
3. The sliding rigid-flexible combined stirring paddle for strengthening oil sludge deoiling of claim 1, wherein:
the shaft sleeve I (402) slides freely on the stirring shaft (2);
the shaft sleeve I (402) is provided with a device for locking the shaft sleeve I (402) to rotate;
the shaft sleeve I (402) is provided with a device for locking the shaft sleeve I (402) to slide;
4. the sliding rigid-flexible combined stirring paddle for strengthening oil sludge deoiling of claim 1, wherein: the rigid paddle blade I (401) is inclined by 45-75 degrees and connected to the shaft sleeve I (402).
5. The sliding rigid-flexible combined stirring paddle for enhancing oil sludge deoiling of claim 1, wherein: one end of the rigid paddle blade I (401), which is far away from the shaft sleeve I (402), is in a circular arc shape;
one end of the rigid paddle blade II (4001) far away from the shaft sleeve II (4002) is arc-shaped;
6. the sliding rigid-flexible combined stirring paddle for strengthening oil sludge deoiling of claim 1, wherein: two ends of each flexible sheet (6) are respectively connected with a circular ring (5); the rigid paddle blade I (401) is connected with the flexible sheet (6) through the circular ring (5); the rigid paddle blade II (4001) is connected with the flexible sheet (6) through the circular ring (5);
one end of each blade of each rigid stirring paddle (4) is connected with the connecting device (7), the other end of each blade is provided with a through hole, and a circular ring (5) is connected in each through hole;
both ends of the long edge of each flexible sheet (6) are respectively provided with a through hole;
the ends of the rigid paddle blade I (401) and the rigid paddle blade II (4001) are provided with through holes for the circular ring (5) to pass through.
7. The sliding rigid-flexible combined stirring paddle for strengthening oil sludge deoiling of claim 1, wherein: the flexible sheet (6) is rectangular. The thickness T of the flexible sheet (6) is 0.8-2 mm, and the width W is 8-12 mm.
8. The sliding rigid-flexible combined stirring paddle for strengthening oil sludge deoiling of claim 1, wherein: the natural straightening length of the flexible sheet (6) is L;
and the shaft sleeve I (402) is provided with a limiting device for limiting the shaft sleeve I (402) to slide downwards.
9. A slidable rigid-flexible combined stirring paddle for strengthening oil sludge deoiling according to claim 1 or 6, characterized in that: the length of the rigid paddle blade I (401) and the rigid paddle blade II (4001) in the horizontal direction is Q, and W is (0.32 to 0.48) × Q.
10. A slidable rigid-flexible combined stirring paddle for strengthening oil sludge deoiling according to claim 1 or 6, characterized in that: the diameter of the ring (5) is phi, and phi is (0.12-0.24) multiplied by Q;
the height of the stirring tank (3) is h, the distance between the rigid paddle blade II (4001) and the bottom of the stirring tank (3) is d, and d is (0.1-0.2) x h.
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| CN202111396023.5A CN114618335A (en) | 2021-11-23 | 2021-11-23 | Slidable rigid-flexible combined stirring paddle for strengthening deoiling of oil sludge |
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Cited By (1)
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