High-dryness centrifugal dewatering coupling sludge drying incineration device

Abstract

The invention relates to the technical field of sludge treatment, in particular to a high-dryness centrifugal dewatering coupling sludge drying incineration device which comprises a rotary drum, a hollow rotary shaft is rotatably arranged in the rotary drum, and two groups of spiral pushing blades matched with the rotary drum in structure are arranged on the hollow rotary shaft in the central axis direction. The interior of the rotary drum is sequentially divided into a sludge pushing area, a sludge treatment area and a purified water pushing area from the end close to the sludge spraying opening through the feeding opening by matching with two groups of spiral pushing blades; wherein the sewage treatment area is formed by alternately arranging a plurality of sewage separation areas and a plurality of sewage mixing areas, and mixing assemblies for mixing sewage and a flocculating agent are arranged in the plurality of sewage separation areas; each sewage mixing area is composed of two groups of spiral pushing blades at intervals, the spiral pushing blades on the two sides in the sewage mixing areas are provided with a plurality of water passing openings which are formed in a crossed mode, and the heights of the distances between the ends of the water passing openings among the multiple sewage mixing areas and the inner wall of the rotary drum are gradually decreased in the sludge pushing direction.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment, and specifically, to a high-dryness centrifugal dehydration coupled with sludge drying and incineration device. Background Art

[0002] With the rapid development of social economy and the acceleration of urbanization, the sludge production shows an increasing trend year by year. Sludge not only contains a large amount of harmful substances, but also may carry pathogens and heavy metals, posing a serious threat to the environment and human health. Therefore, the harmless treatment of sludge has become an urgent problem to be solved. However, the current level of harmless sludge treatment in China lags seriously behind, and the treatment rate is less than 30%, making sludge treatment an urgent and important task.

[0003] Centrifugal dehydration technology is an efficient sludge dehydration method, and its principle is mainly to accelerate the separation of solids and liquids through the action of centrifugal force. Compared with other dehydration methods, centrifugal dehydration technology has the advantages of high dehydration efficiency, small floor area, and simple operation. Through centrifugal dehydration treatment, the water in the sludge can be effectively removed, and the dryness of the sludge can be increased, creating favorable conditions for subsequent drying and incineration treatment.

[0004] The existing centrifugal sludge dehydration equipment mainly has the following technical defects during operation: First, in the solid-liquid separation link, there are key deficiencies in the structural design of the screw conveyor. Its screw blades fail to form an effective extrusion gradient at the solid phase discharge end, resulting in the premature discharge of sludge with still relatively high water content; at the same time, due to insufficient solid phase interception efficiency at the liquid phase discharge end, the separated liquid still contains excessive suspended solids, causing low solid-liquid separation efficiency. Second, in the key chemical agent mixing link, the equipment adopts a working mode of injecting flocculant synchronously through the hollow pipeline of the screw shaft. Due to the high-speed rotation of the screw conveyor, the residence time of sewage and flocculant between the blades is insufficient, affecting the flocculation effect of sewage, and further affecting the sedimentation performance and separation effect of sludge.

[0005] Based on this, the present invention discloses a high-dryness centrifugal dehydration coupled with sludge drying and incineration device. Summary of the Invention

[0006] To solve the problems in the background art that the existing centrifugal sludge dehydration equipment has insufficient solid-liquid separation caused by the lack of axial extrusion gradient of the screw conveyor and uneven dispersion of flocculant caused by insufficient circumferential mixing efficiency, which jointly restrict the sludge dehydration efficiency and the quality of the effluent, the present invention provides a high-dryness centrifugal dehydration coupled with sludge drying and incineration device, which includes a bracket, on which a drum is provided, one end of which is provided with a sludge spraying port, and the other end is provided with a water outlet pipe. A hollow rotating shaft is rotatably arranged in the drum, and a feed port is opened on the hollow rotating shaft.

[0007] Among them, two sets of spiral pushing blades with structures adapted to the rotating drum are arranged on the hollow rotating shaft along the central axis direction. Inside the rotating drum, in cooperation with the two sets of spiral pushing blades, through the feed port, it is successively divided into a sludge pushing area, a sludge treatment area, and a purified water pushing area starting from the end near the mud spraying port;

[0008] Among them, the sewage treatment area is composed of several sewage separation areas and several sewage mixing areas arranged alternately. In several sewage separation areas, mixing components for mixing sewage and flocculant are provided;

[0009] Except for the sewage separation area at the very front, the sewage mixing area is located at the front end of the sewage separation area along the sludge pushing direction;

[0010] The sewage mixing area is composed of the spacing between the two sets of spiral pushing blades. On the spiral pushing blades on both sides inside the sewage mixing area, several water passing openings arranged in a cross pattern are provided. The height of the end of the water passing openings between several sewage mixing areas from the inner wall of the rotating drum gradually decreases along the sludge pushing direction;

[0011] The mixing component is driven by the water flow of the water passing opening to rotate and stir and mix the sewage.

[0012] As a further improvement of this technical solution, the two sets of spiral pushing blades arranged on the hollow rotating shaft are composed of a first spiral pushing blade and a second spiral pushing blade with the same structure and a spacing therebetween. The first spiral pushing blade is arranged at the front end of the second spiral pushing blade along the sludge pushing direction.

[0013] As a further improvement of this technical solution, the interval of the adjacent sludge pushing area located at the rear end of the feed port along the sludge pushing direction and within the pitch of the first spiral pushing blade and the second spiral pushing blade is the first sewage separation area.

[0014] As a further improvement of this technical solution, the sewage mixing areas formed by the pitch difference between the first spiral pushing blade and the second spiral pushing blade at the rear end of the first sewage separation area are successively the first mixing area, the second mixing area, the third mixing area, and the fourth mixing area.

[0015] Preferably, on the first spiral pushing blade and the second spiral pushing blade on the front and rear sides inside the first mixing area, several first water passing openings arranged in a cross pattern are circumferentially arrayed around the central axis of the hollow rotating shaft;

[0016] On the first spiral pushing blade and the second spiral pushing blade on the front and rear sides inside the second mixing area, several second water passing openings arranged in a cross pattern are circumferentially arrayed around the central axis of the hollow rotating shaft;

[0017] On the first spiral pushing blades and the second spiral pushing blades on the front and rear sides in the third mixing area, a number of third water passing openings which are cross - arranged are circumferentially arrayed around the central axis of the hollow rotating shaft;

[0018] On the first spiral pushing blades and the second spiral pushing blades on the front and rear sides in the fourth mixing area, a number of fourth water passing openings which are cross - arranged are circumferentially arrayed around the central axis of the hollow rotating shaft.

[0019] As a further improvement of this technical solution, the heights of the first water passing opening, the second water passing opening, the third water passing opening and the fourth water passing opening increase step by step along the sludge pushing direction, and the widths of the first water passing opening, the second water passing opening, the third water passing opening and the fourth water passing opening become narrower step by step along the sludge pushing direction.

[0020] Preferably, the sewage separation area includes a second sewage separation area, a third sewage separation area, a fourth sewage separation area and a fifth sewage separation area which are respectively the overlapping intervals of the pitches of the spiral blades of the first spiral pushing blade and the second spiral pushing blade located at the rear end of the first sewage separation area in sequence.

[0021] As a further improvement of this technical solution, the mixing assembly includes a first mixing assembly, a second mixing assembly and a third mixing assembly respectively located in the second sewage separation area, the third sewage separation area and the fourth sewage separation area, and the mixing assemblies all include a rotating rod rotatably connected to the hollow rotating shaft, and a number of rotating blades are fixedly arranged around the center of the rotating rod in a circumferential array;

[0022] The heights of the rotating rods and the rotating blades of the first mixing assembly, the second mixing assembly and the third mixing assembly are respectively adapted to the heights of the corresponding water passing openings on the second spiral pushing blades at the front ends in the second sewage separation area, the third sewage separation area and the fourth sewage separation area, and the rotating blades of the first mixing assembly, the second mixing assembly and the third mixing assembly are respectively obliquely opposite to the corresponding water passing openings on the second spiral pushing blades at the front ends in the second sewage separation area, the third sewage separation area and the fourth sewage separation area.

[0023] Preferably, a first rotating shaft with a conical structure is arranged at the rear end of the hollow rotating shaft in the fifth sewage separation area. The first rotating shaft has a structure that is narrow at the front and wide at the rear along the sludge pushing direction, and the first spiral pushing blade and the second spiral pushing blade at the rear end of the fifth sewage separation area are connected to the hollow rotating shaft through the first rotating shaft.

[0024] As a further improvement of this technical solution, a number of fifth water passing openings are staggeredly arranged on the spiral blades of the first spiral pushing blade and the second spiral pushing blade near the rear end of the fifth sewage separation area. The height of the fifth water passing opening is lower than the height of the fourth water passing opening, and the width is wider than the width of the fourth water passing opening;

[0025] There is no mixing component in the sewage separation area located in the first rotating shaft interval, and water passing openings are provided in the upper parts of the first spiral pushing blade and the second spiral pushing blade at the rear end of the purified water pushing area.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. In this high-dryness centrifugal dehydration coupled with sludge drying and incineration device, a multi-stage gradient extrusion and layered screening mechanism is realized. By setting the height of the water passing openings (the heights of the first to fourth water passing openings increase) and the narrowing opening widths that gradually decrease along the sludge pushing direction, an axial extrusion gradient is formed. Specifically, it is manifested as follows: at the front end, the high-opening screens the high-moisture-content sludge for secondary treatment, and at the rear end, the low-opening accurately intercepts the low-moisture-content dry sludge. This gradient design enables dynamic stratification (low moisture content in the outer layer / high moisture content in the inner layer) to be formed inside the drum. Compared with the traditional uniform extrusion mode, the solid-phase recovery rate is increased, and the moisture content of the sludge cake is reduced.

[0028] 2. In this high-dryness centrifugal dehydration coupled with sludge drying and incineration device, through the coordinated setting of the spiral pushing blade and the water passing opening, two sets of spiral pushing blades with the same structure and a certain distance are arranged on the hollow rotating shaft, and water passing openings with gradually increasing height and gradually narrowing width along the sludge pushing direction are opened on the blades. This enables the sludge to gradually push the sludge layer with lower water content to the sludge spraying port during the pushing process, while the sludge and sewage with higher water content flow through the water passing openings into the rear interval for further flocculant mixing and sludge separation, which is conducive to realizing the gradual separation of the sludge and the effective discharge of the purified water, thereby improving the sludge dehydration efficiency and the water quality of the effluent.

[0029] 3. In this high-dryness centrifugal dehydration coupled with sludge drying and incineration device, a mixing component for mixing sewage and flocculant is arranged in the sewage separation area, including a rotating rod and rotating blades. The rotating blades of the mixing component are obliquely facing the water passing opening, and the flow rate of the sewage can be utilized to impact the rotating blades, causing the rotating rod and the rotating blades to rotate, thereby increasing the mixing degree of the sewage and the flocculant, facilitating the improvement of the mixing effect of the sewage and the flocculant, ensuring that the sludge can be fully flocculated before separation, and further improving the sludge dehydration efficiency and the clarity of the effluent.

[0030] 4. In this high-dryness centrifugal dehydration coupled with sludge drying and incineration device, a first rotating shaft with a conical structure is arranged at the rear end of the fifth sewage separation area. The conical structure of the first rotating shaft can reduce the distance between it and the inner wall of the drum, increase the water pressure in the purified water pushing area. As the outer diameter of the first rotating shaft gets larger closer to the water outlet pipe, the drainage speed of the water passing opening is accelerated, which is conducive to improving the overall sewage treatment efficiency.

[0031] 5. In the high-dryness centrifugal dehydration coupled with sludge drying and incineration device, through the alternating arrangement of the sewage separation area and the sewage mixing area, the inside of the drum, in cooperation with two groups of spiral pushing blades, is successively divided into a sludge pushing area, several sewage separation areas, and several sewage mixing areas starting from the end near the mud spraying port through the feed port. The sewage mixing area is located at the front end of the sewage separation area along the sludge pushing direction, so that the sewage has an increased residence time in the mixing area, facilitating the further reaction between the flocculant and the sewage. After passing through the sewage mixing area, it then enters the sewage separation area, which is conducive to more thorough sludge centrifugal separation of the sewage and improves the solid-liquid separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 is a schematic diagram of the structure of the spiral pushing assembly of the present invention;

[0034] Figure 3 is a front view of the structure of the spiral pushing assembly of the present invention;

[0035] Figure 4 is a side view of the structure of the first spiral pushing blade of the present invention;

[0036] Figure 5 is a schematic diagram of the structure of the sludge separation area of the spiral pushing assembly of the present invention;

[0037] Figure 6 is a schematic diagram of the structure of the hollow rotating shaft of the present invention;

[0038] Figure 7 is a schematic diagram of the structure of the mixing assembly of the present invention;

[0039] Figure 8 is a schematic diagram of the structure of the first spiral pushing blade of the present invention;

[0040] Figure 9 is a schematic diagram of the structure of the water passing port of the present invention.

[0041] The meanings of the various reference numerals in the figure are as follows:

[0042] 1. Support; 2. Rotary drum; 3. Mud spraying port; 4. Water outlet pipe; 5. Hollow rotating shaft; 6. First rotating shaft; 7. First spiral pushing blade; 8. Second spiral pushing blade; 9. Feed inlet; 10. Sludge pushing area; 11. First sewage separation area; 12. First mixing area; 13. Second sewage separation area; 14. First mixing component; 15. Second mixing area; 16. Third sewage separation area; 17. Second mixing component; 18. Third mixing area; 19. Fourth sewage separation area; 20. Third mixing component; 21. Fourth mixing area; 22. Fifth sewage separation area; 23. Purified water pushing area; 24. First water passing port; 25. Second water passing port; 26. Third water passing port; 27. Fourth water passing port; 28. Fifth water passing port.

[0043] 141. Rotating rod; 142. Rotating blade. Detailed implementation manner

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] Existing centrifugal sludge dewatering equipment has problems of insufficient solid-liquid separation caused by the lack of axial extrusion gradient of the screw conveyor and uneven dispersion of flocculants caused by insufficient circumferential mixing efficiency, which jointly restrict the sludge dewatering efficiency and the quality of the effluent.

[0046] Therefore, the present invention provides a high-dryness centrifugal dehydration coupled sludge drying and incineration device. Refer to Figure 1 - Figure 2 As shown in the figure, it includes a support 1. A rotary drum 2 is arranged on the support 1. One end is provided with a mud spraying port 3, and the other end is provided with a water outlet pipe 4. A hollow rotating shaft 5 is rotatably arranged in the rotary drum 2. A feed inlet 9 is opened on the hollow rotating shaft 5. Sewage and flocculant enter the rotary drum 2 through the feed inlet 9. Along the central axis direction on the hollow rotating shaft 5, there are two groups of spiral pushing blades whose structures are adapted to the rotary drum 2. Inside the rotary drum 2, in cooperation with the two groups of spiral pushing blades, through the feed inlet 9, it is successively divided into a sludge pushing area 10, a sludge treatment area, and a purified water pushing area 23 starting from the end near the mud spraying port 3. Among them, the sewage treatment area is composed of several sewage separation areas and several sewage mixing areas arranged alternately. And except for the sewage separation area arranged at the forefront, the sewage mixing area is located at the front end of the sewage separation area along the sludge pushing direction. In this way, after passing through the sewage mixing area and then entering the sewage separation area, it is convenient to perform centrifugal separation of sludge from the sewage.

[0047] The sewage separation area and the mixing area are alternately structured (for example, the second sewage separation area 13 is adjacent to the first mixing area 12). Through the iterative treatment process of "separation - mixing - re - separation", the residence time of each treatment unit is extended, forming a "fine treatment chain" with the treatment intensity increasing as the process progresses.

[0048] Specifically, refer to Figure 2 - Figure 3 and Figure 5 As shown, the two groups of spiral pushing blades arranged on the hollow rotating shaft 5 are composed of the first spiral pushing blade 7 and the second spiral pushing blade 8 with the same structure and a spacing. The first spiral pushing blade 7 is arranged at the front end of the second spiral pushing blade 8 along the sludge pushing direction. The interval within the pitch of the first spiral pushing blade 7 and the second spiral pushing blade 8 where the adjacent sludge pushing area 10 is located at the rear end of the feed port 9 along the sludge pushing direction is the first sewage separation area 11. The sewage mixing areas formed by the pitch difference between the first spiral pushing blade 7 and the second spiral pushing blade 8 at the rear end of the first sewage separation area 11 are successively the first mixing area 12, the second mixing area 15, the third mixing area 18, and the fourth mixing area 21.

[0049] Among them, as Figure 3 and Figure 8 - Figure 9 shown, a number of first water passing ports 24 are arranged in a circumferential array around the central axis of the hollow rotating shaft 5 on the first spiral pushing blade 7 and the second spiral pushing blade 8 on the front and rear sides in the first mixing area 12, and they are cross - arranged; a number of second water passing ports 25 are arranged in a circumferential array around the central axis of the hollow rotating shaft 5 on the first spiral pushing blade 7 and the second spiral pushing blade 8 on the front and rear sides in the second mixing area 15, and they are cross - arranged; a number of third water passing ports 26 are arranged in a circumferential array around the central axis of the hollow rotating shaft 5 on the first spiral pushing blade 7 and the second spiral pushing blade 8 on the front and rear sides in the third mixing area 18, and they are cross - arranged; a number of fourth water passing ports 27 are arranged in a circumferential array around the central axis of the hollow rotating shaft 5 on the first spiral pushing blade 7 and the second spiral pushing blade 8 on the front and rear sides in the fourth mixing area 21.

[0050] The number of cross - arranged water passing ports forms a circumferential turbulent mixing enhancement system. In the mixing area, a cross - staggered water passing port design is adopted (for example, 24 water passing ports can be arranged in a 30° cross - arrangement in the first mixing area 12), combined with a mixing component (the rotating blade 142 can be circumferentially distributed at 120°). When high - speed water flow passes through the variable - cross - section water passing port, a vortex street effect is generated to drive the rotating blade 142 to rotate, forming a three - dimensional shear flow field.

[0051] It should be noted that, as Figure 4 and Figure 9As shown, the heights of the first water passing port 24, the second water passing port 25, the third water passing port 26, and the fourth water passing port 27 increase step by step along the sludge pushing direction. That is to say, the height of the end of the water passing port between several sewage mixing zones from the inner wall of the drum 2 decreases step by step along the sludge pushing direction. The widths of the first water passing port 24, the second water passing port 25, the third water passing port 26, and the fourth water passing port 27 become narrower step by step along the sludge pushing direction. That is to say, closer to the feed port 9, the water passing ports between the sewage separation zones and the sewage mixing zones at the front end on the hollow rotating shaft 5 are higher. In this way, for the sludge exceeding the end of the water passing port, only the sludge above the end of the water passing port, that is, the sludge between the end of the water passing port and the inner wall of the drum 2, is pushed out. According to the centrifugal force, the water content of the sludge closer to the inner wall of the drum 2 is lower. Then, through such a setting, the sludge with lower water content can be pushed to the sludge spraying port 3, while the sludge with relatively higher water content flows through the water passing port into the subsequent section for further mixing of the flocculant and separation of the sludge and sewage, entering the next section. Similarly, the sludge closer to the inner side of the drum 2 is still pushed out, and the sludge exceeding the end of the water passing port continues to enter the next section for treatment, and so on.

[0052] The step-by-step change in the height and width of the water passing port, with the height of the water passing port increasing step by step and the width becoming narrower step by step along the sludge pushing direction, enables the sludge layer closer to the inner wall of the drum 2 (with lower water content) to be gradually pushed to the sludge spraying port 3, while the sludge and sewage with higher water content flow through the gradually wider and lower water passing port to the subsequent section for treatment, which is conducive to realizing the step-by-step dehydration of the sludge and improving the dehydration efficiency and quality.

[0053] Furthermore, referring to Figure 3 and Figure 5 As shown, the sewage separation zone includes the second sewage separation zone 13, the third sewage separation zone 16, the fourth sewage separation zone 19, and the fifth sewage separation zone 22, which are respectively the overlapping intervals of the pitches of the spiral blades of the first spiral pushing blade 7 and the second spiral pushing blade 8 located at the rear end of the first sewage separation zone 11 in sequence; a first rotating shaft 6 with a conical structure is arranged at the rear end of the fifth sewage separation zone 22 on the hollow rotating shaft 5. The first rotating shaft 6 has a structure that is narrower at the front and wider at the rear along the sludge pushing direction. The first spiral pushing blade 7 and the second spiral pushing blade 8 at the rear end of the fifth sewage separation zone 22 are connected to the hollow rotating shaft 5 through the first rotating shaft 6; a number of fifth water passing ports 28 are staggeredly arranged on the spiral blades of the first spiral pushing blade 7 and the second spiral pushing blade 8 near the rear end of the fifth sewage separation zone 22. The height of the fifth water passing port 28 is lower than the height of the fourth water passing port 27, and the width is wider than the width of the fourth water passing port 27.

[0054] Even further, referring to Figure 3 and Figure 5 - Figure 7As shown in the figure, a mixing component for mixing sewage and flocculant is provided in several sewage separation zones, and there is no mixing component in the sewage separation zone within the range of the first rotating shaft 6. Water passing openings are formed in the upper parts of the first spiral pushing blade 7 and the second spiral pushing blade 8 at the rear end of the purified water pushing zone 23. The mixing component includes a first mixing component 14, a second mixing component 17, and a third mixing component 20 respectively located in the second sewage separation zone 13, the third sewage separation zone 16, and the fourth sewage separation zone 19. The mixing components all include a rotating rod 141 rotatably connected to the hollow rotating shaft 5, and a plurality of rotating blades 142 are fixedly arranged on the rotating rod 141 in a circumferential array around its center. The heights of the rotating rods 141 and the rotating blades 142 of the first mixing component 14, the second mixing component 17, and the third mixing component 20 are respectively adapted to the heights of the corresponding water passing openings on the second spiral pushing blade 8 at the front end in the second sewage separation zone 13, the third sewage separation zone 16, and the fourth sewage separation zone 19, and the rotating blades 142 of the first mixing component 14, the second mixing component 17, and the third mixing component 20 are respectively obliquely opposite to the corresponding water passing openings on the second spiral pushing blade 8 at the front end in the second sewage separation zone 13, the third sewage separation zone 16, and the fourth sewage separation zone 19.

[0055] To sum up, by forming a trinity treatment system of "gradient extrusion - dynamic mixing - hydraulic strengthening", the problems that the existing centrifugal sludge dewatering equipment has insufficient solid-liquid separation caused by the lack of axial extrusion gradient of the screw conveyor and uneven dispersion of the flocculant caused by insufficient circumferential mixing efficiency, which jointly restrict the sludge dewatering efficiency and the effluent quality, are effectively solved.

[0056] Working principle:

[0057] When the device is working, the sewage to be treated and the flocculant are discharged into the hollow rotating shaft 5, and then enter the sludge pushing area 10 and the first sewage separation area 11 of the rotating drum 2 through the feed port 9 on the hollow rotating shaft 5. Then the rotating drum 2 rotates at a high speed to separate the sludge and water. Since the intervals of the sludge pushing area 10 and the first sewage separation area 11 are relatively short, the sewage that has just entered these two intervals in the traditional device will not be completely separated, that is, the sludge with a high water content will be pushed by the spiral blade in the sludge pushing area 10 to the sludge spraying port 3 for discharge; while in the present invention, water passing ports with heights gradually increasing along the sludge pushing direction are provided in the first sewage separation area 11 and the spiral blade at the rear end. In this way, the outermost sludge layer can be pushed by the spiral blade at the rear end of the first sewage separation area 11 into the sludge pushing area 10 and then sent to the sludge spraying port 3 for discharge. As we know, due to the centrifugal force, the sludge layer closer to the inner wall of the rotating drum 2 has a lower water content, and the sludge layer closer to the inner side and with a larger water contact surface has a higher water content. Therefore, due to the different settings of the heights of the water passing ports, the spiral blade near the first sewage separation area 11 can take away the innermost sludge layer, and the sludge layer with a higher water content and the sewage will flow into the second sewage separation area 13 through the first water passing port 24 at the front end of the second sewage separation area 13, that is, at the rear end of the first sewage separation area 11;

[0058] Before flowing into the second sewage separation area 13, it will first pass through the first mixing area 12. Since the first water passing ports 24 on both sides of the first mixing area 12 are staggered, the sewage will have a certain residence time in this interval, allowing the flocculant and the sewage to react further. Then it enters the second sewage separation area 13 for separation. At the same time, after entering the second sewage separation area 13, in order to prevent the uneven mixing of the flocculant or the insufficient aging effect, the first mixing component 14 in the second sewage separation area 13 is used to increase the mixing of the sewage and the flocculant. Since the sewage closer to the first sewage separation area 11 needs to process the mixing of the sewage and the flocculant more, because their residence time in the rotating drum 2 is not long enough, the first water passing port 24 has the highest height and the narrowest width. As explained above, the highest height is to make the top of the water passing port of the spiral blade at the front end of the second sewage separation area 13 closest to the inner wall of the rotating drum 2, so as to push the sludge layer closer to the inner wall of the rotating drum 2, because the sludge layer closer to the inner wall of the rotating drum 2 has a lower water content; while the first water passing port 24 is the narrowest because the sewage in the interval of the second sewage separation area 13 needs a greater stirring force to mix the sewage and the flocculant. Therefore, the first water passing port 24 is the narrowest, and the sewage flowing through the first water passing port 24 has the fastest flow rate, so as to impact the rotating blade 142 on the first mixing component 14 to make the rotating blade 142 rotate, that is, stir faster, and increase the mixing of the sewage and the flocculant in the interval of the second sewage separation area 13.

[0059] After the sewage in the second sewage separation area 13 is further mixed and separated, the second water passing port 25 on the spiral blade near the rear end of the second sewage separation area 13 starts to function. The height of the second water passing port 25 is lower than that of the first water passing port 24. Since the sludge content in the sewage after being treated in the first sewage separation area 11 begins to decrease, and at the same time, with the further improvement of the reaction effect between the flocculant and the sewage, there is more purified water in the third sewage separation area 16 than in the second sewage separation area 13. Therefore, the second water passing port 25 on the spiral blade at the rear end of the second sewage separation area 13, which is also the front end of the third sewage separation area 16, is designed to be lower than the first water passing port 24. This can further push more sludge with lower water content than in the second sewage separation area 13, while allowing the remaining sludge and sewage with higher water content to flow into the second mixing area 15 through the second water passing port 25. After entering the second mixing area 15, the residence time is increased through the second water passing ports 25 arranged alternately on both sides in the second mixing area 15 to mix the flocculant and the sewage. Then, it enters the third sewage separation area 16 and impacts the second mixing component 17 in the third sewage separation area 16. The height of the rotating rod 141 on the second mixing component 17 is adapted to the second water passing port 25, so that the impact makes it rotate, further stirring to improve the mixing degree of the sewage and the flocculant, and continuing to pave the way for the sewage to enter the next third mixing area 18 and the fourth sewage separation area 19.

[0060] Similarly, the third mixing area 18, the fourth sewage separation area 19, and the fourth mixing area 21 all separate and push the sludge and the purified water in the above process. The rear section can separate the remaining untreated sludge in the front section, and at the same time, gradually push the sludge layer with lower water content to the mud spraying port 3 end, while the purified water flows through the gradually wider and lower water passing ports to the water outlet pipe 4 for discharge through each section.

[0061] When the sludge is almost processed, it enters the section at the rear end of the fifth sewage separation area 22 mainly for water purification, that is, the section between the fifth sewage separation area 22 and the purified water pushing area 23. Since this section is mainly for purified water and may contain a small amount of impurities, there are still water inlets at both the front and rear ends of the fifth sewage separation area 22 for interception to increase the reaction time. Then, there is no first mixing component 14 for mixing because the previous treatment has generally met the requirements. At the same time, since there is a conical structure first rotating shaft 6 on the hollow rotating shaft 5 in the section between the fifth sewage separation area 22 and the purified water pushing area 23, it is not convenient to set the first mixing component 14. Setting the first rotating shaft 6 can reduce the distance between the outer periphery of the first rotating shaft 6 and the inner wall of the drum 2, increasing the pushing water pressure in the purified water pushing area 23. As the outer diameter of the first rotating shaft 6 becomes larger closer to the water outlet pipe 4, the drainage of the water inlet will be faster, which can improve the overall sewage treatment efficiency. And the spiral blades of the first spiral pushing blade 7 and the second spiral pushing blade 8 in this section do not have water inlets, which can adapt to the need to increase the water pressure.

[0062] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. A high-dryness centrifugal dehydration coupled sludge drying and incineration device, which comprises a bracket (1). A rotating drum (2) is arranged on the bracket (1). One end of the rotating drum (2) is provided with a sludge spraying port (3), and the other end is provided with a water outlet pipe (4). A hollow rotating shaft (5) is rotatably arranged in the rotating drum (2). A feed inlet (9) is formed in the hollow rotating shaft (5), and it is characterized in that: On the hollow rotating shaft (5), there are two sets of spiral pushing blades whose structures are adapted to the rotating drum (2) along the central axis direction. Inside the rotating drum (2), in cooperation with the two sets of spiral pushing blades, through the feed port (9), it is successively divided into a sludge pushing area (10), a sewage treatment area, and a purified water pushing area (23) starting from the end near the mud spraying port (3); Among them, the sewage treatment area is composed of several sewage separation areas and several sewage mixing areas arranged alternately. In several sewage separation areas, there are mixing components for mixing sewage and flocculant; Except for the sewage separation area at the very front, the sewage mixing area is located at the front end of the sewage separation area along the sludge pushing direction; The sewage mixing area is composed of the spacing between the two sets of spiral pushing blades. On the spiral pushing blades on both sides inside the sewage mixing area, there are several water passing openings arranged in a crosswise manner. The height of the end of the water passing openings between several sewage mixing areas from the inner wall of the rotating drum (2) decreases step by step along the sludge pushing direction; The mixing component is driven by the water flow of the water passing opening to rotate and stir and mix the sewage.

2. The high-dryness centrifugal dehydration coupled with sludge drying and incineration device according to claim 1, wherein: The two sets of spiral pushing blades arranged on the hollow rotating shaft (5) are composed of a first spiral pushing blade (7) and a second spiral pushing blade (8) with the same structure and a spacing. The first spiral pushing blade (7) is arranged at the front end of the second spiral pushing blade (8) along the sludge pushing direction.

3. The high-dryness centrifugal dewatering coupled with sludge drying and incineration device according to claim 2, characterized in that: The area near the sludge pushing area (10) at the rear end of the feed port (9) along the sludge pushing direction and within the pitch of the first spiral pushing blade (7) and the second spiral pushing blade (8) is the first sewage separation area (11).

4. The high-dryness centrifugal dehydration coupled with sludge drying and incineration device according to claim 3, wherein: The sewage mixing areas formed by the pitch differences between the first spiral pushing blade (7) and the second spiral pushing blade (8) at the rear end of the first sewage separation area (11) are successively the first mixing area (12), the second mixing area (15), the third mixing area (18), and the fourth mixing area (21).

5. The high-dryness centrifugal dehydration coupled with sludge drying and incineration device according to claim 4, wherein: On the first spiral pushing blade (7) and the second spiral pushing blade (8) on the front and rear sides inside the first mixing area (12), several first water passing openings (24) are arranged in a circumferential array around the central axis of the hollow rotating shaft (5) and are arranged in a crosswise manner; On the first spiral pushing blade (7) and the second spiral pushing blade (8) on the front and rear sides inside the second mixing area (15), several second water passing openings (25) are arranged in a circumferential array around the central axis of the hollow rotating shaft (5) and are arranged in a crosswise manner; On the first spiral pushing blade (7) and the second spiral pushing blade (8) on the front and rear sides inside the third mixing area (18), several third water passing openings (26) are arranged in a circumferential array around the central axis of the hollow rotating shaft (5) and are arranged in a crosswise manner; On the first spiral pushing blade (7) and the second spiral pushing blade (8) on the front and rear sides inside the fourth mixing area (21), several fourth water passing openings (27) are arranged in a circumferential array around the central axis of the hollow rotating shaft (5) and are arranged in a crosswise manner.

6. The high-dryness centrifugal dehydration coupled with sludge drying and incineration device according to claim 5, wherein: The heights of the first water passing opening (24), the second water passing opening (25), the third water passing opening (26) and the fourth water passing opening (27) increase step by step along the sludge pushing direction, and the widths of the first water passing opening (24), the second water passing opening (25), the third water passing opening (26) and the fourth water passing opening (27) become narrower step by step along the sludge pushing direction.

7. The high-dryness centrifugal dehydration coupled with sludge drying and incineration device according to claim 6, characterized in that: The sewage separation area includes a second sewage separation area (13), a third sewage separation area (16), a fourth sewage separation area (19) and a fifth sewage separation area (22) which are in turn the overlapping intervals of the pitches of the spiral blades of the first spiral pushing blade (7) and the second spiral pushing blade (8) at the rear end of the first sewage separation area (11).

8. The high-dryness centrifugal dehydration coupled with sludge drying and incineration device according to claim 7, wherein: The mixing assembly includes a first mixing assembly (14), a second mixing assembly (17) and a third mixing assembly (20) respectively located in the second sewage separation area (13), the third sewage separation area (16) and the fourth sewage separation area (19), and the mixing assemblies all include a rotating rod (141) rotatably connected to the hollow rotating shaft (5), and a plurality of rotating blades (142) are fixedly arranged on the rotating rod (141) in a circumferential array around its center; The heights of the rotating rods (141) and the rotating blades (142) of the first mixing assembly (14), the second mixing assembly (17) and the third mixing assembly (20) are respectively adapted to the heights of the corresponding water passing openings on the second spiral pushing blade (8) at the front end in the second sewage separation area (13), the third sewage separation area (16) and the fourth sewage separation area (19), and the rotating blades (142) of the first mixing assembly (14), the second mixing assembly (17) and the third mixing assembly (20) are respectively obliquely opposite to the corresponding water passing openings on the second spiral pushing blade (8) at the front end in the second sewage separation area (13), the third sewage separation area (16) and the fourth sewage separation area (19).

9. The high-dryness centrifugal dehydration coupled with sludge drying and incineration device according to claim 7, wherein: A first rotating shaft (6) with a conical structure is arranged at the rear end of the hollow rotating shaft (5) in the fifth sewage separation area (22). The first rotating shaft (6) has a structure that is narrow at the front and wide at the rear along the sludge pushing direction. The first spiral pushing blade (7) and the second spiral pushing blade (8) at the rear end of the fifth sewage separation area (22) are connected to the hollow rotating shaft (5) through the first rotating shaft (6).

10. The high-dryness centrifugal dehydration coupled with sludge drying and incineration device according to claim 9, wherein: A number of fifth water passing openings (28) are staggered on the spiral blades of the first spiral pushing blade (7) and the second spiral pushing blade (8) near the rear end of the fifth sewage separation area (22). The height of the fifth water passing opening (28) is lower than the height of the fourth water passing opening (27), and the width is wider than the width of the fourth water passing opening (27); No mixing assembly is provided in the sewage separation area in the interval of the first rotating shaft (6), and water passing openings are provided in the upper parts of the first spiral pushing blade (7) and the second spiral pushing blade (8) at the rear end of the purified water pushing area (23).

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