High-dry centrifugal dewatering coupled with sludge drying and incineration device

Abstract

The present application relates to sludge treatment technical field, specifically, it is a kind of high dryness centrifugal dewatering coupling sludge drying incineration device, it includes rotary drum, hollow rotating shaft is rotationally arranged in rotary drum, two groups of helical pushing blades with rotary drum are adapted are arranged on hollow rotating shaft along the direction of central axis, rotary drum is sequentially divided into sludge pushing area, sludge treatment area and clean water pushing area by two groups of helical pushing blades through feed inlet from the end of adjacent mud spraying port;Wherein sludge treatment area is alternately arranged by several sewage separation zones and several sewage mixing zones, and the mixing assembly for mixing sewage and flocculating agent is arranged in several sewage separation zones;Sewage mixing zone is composed of the distance between two groups of helical pushing blades, and several cross-set water inlets are opened on the helical pushing blades on both sides in sewage mixing zone, and the height of the end of water inlet between several sewage mixing zones and the distance from the inner wall of rotary drum gradually decreases along the sludge pushing direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sludge treatment, in particular to a high-dryness centrifugal dewatering coupled sludge drying and incineration device. BACKGROUND

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

[0003] Centrifugal dewatering technology is a high-efficiency sludge dewatering method, whose principle is mainly to accelerate the separation of solid and liquid through the action of centrifugal force. Compared with other dewatering methods, centrifugal dewatering technology has the advantages of high dewatering efficiency, small occupied area and simple operation. Through centrifugal dewatering treatment, the water in the sludge can be effectively removed, and the dryness of the sludge can be improved, creating favorable conditions for subsequent drying and incineration treatment.

[0004] The existing centrifugal sludge dewatering equipment mainly has the following technical defects in the running process: first, in the solid-liquid separation link, the structure design of the screw conveyor has a key deficiency. The spiral blade at the solid phase discharge end fails to form an effective extrusion gradient, resulting in that the sludge with still high water content is discharged too early; at the same time, the liquid phase discharge end fails to retain enough solid phase, resulting in that the separated liquid still contains excessive suspended solids, causing low solid-liquid separation efficiency. Secondly, in the key reagent mixing link, the equipment adopts the working mode of synchronously injecting flocculants through the hollow pipe of the screw shaft. Due to the high-speed rotation of the screw conveyor, the residence time of sewage and flocculants between the blades is insufficient, which affects the flocculation effect of sewage, and further affects the settling performance and separation effect of sludge.

[0005] Based on this, the present application discloses a high-dryness centrifugal dewatering coupled sludge drying and incineration device. SUMMARY

[0006] In order to solve the 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 of the existing centrifugal sludge dewatering equipment, which jointly restrict the sludge dewatering efficiency and water quality, the present application provides a high-dryness centrifugal dewatering coupled sludge drying and incineration device, which comprises a support, a rotating drum is arranged on the support, one end of the rotating drum is provided with a sludge injection port, and the other end of the rotating drum is provided with a water outlet pipe, a hollow rotating shaft is rotatably arranged in the rotating drum, and a feeding port is formed in the hollow rotating shaft;

[0007] The two groups of spiral pushing blades are arranged on the hollow rotating shaft along the central axis direction and are matched with the rotating drum.

[0008] The sewage treatment area is composed of a plurality of sewage separation areas and a plurality of sewage mixing areas arranged alternately, and the plurality of sewage separation areas are provided with a mixing assembly for mixing sewage and flocculants.

[0009] Except for the sewage separation area arranged at the most front end, 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 distance between the two groups of spiral pushing blades, and a plurality of cross-arranged water inlets are arranged on the two sides of the spiral pushing blades in the sewage mixing area, and the height of the end of the water inlets between the plurality of sewage mixing areas and the inner wall of the rotating drum decreases gradually along the sludge pushing direction.

[0011] The mixing assembly is driven to rotate and mix the sewage by the water flow of the water inlet.

[0012] As a further improvement of the technical solution, the two groups of spiral pushing blades arranged on the hollow rotating shaft are composed of first spiral pushing blades and second spiral pushing blades which have the same structure and a distance, and the first spiral pushing blades are arranged at the front end of the second spiral pushing blades along the sludge pushing direction.

[0013] As a further improvement of the technical solution, the interval between the first spiral pushing blades and the second spiral pushing blades in the interval of the pitch of the first spiral pushing blades and the second spiral pushing blades at the rear end of the feeding port along the sludge pushing direction is the first sewage separation area.

[0014] As a further improvement of the technical solution, the sewage mixing area composed of the difference in pitch of the first spiral pushing blades and the second spiral pushing blades at the rear end of the first sewage separation area is sequentially the first mixing area, the second mixing area, the third mixing area and the fourth mixing area.

[0015] Preferably, a plurality of first water inlets are arranged in a circular array around the central axis of the hollow rotating shaft on the first spiral pushing blades and the second spiral pushing blades on the front and rear sides of the first mixing area.

[0016] A plurality of second water inlets are arranged in a circular array around the central axis of the hollow rotating shaft on the first spiral pushing blades and the second spiral pushing blades on the front and rear sides of the second mixing area.

[0017] A plurality of third water passages are arranged in a cross manner and are formed in a circumferential array around the central axis of the hollow rotating shaft on the first and second spiral pushing blades on the front and back sides in the third mixing area.

[0018] A plurality of fourth water passages are arranged in a cross manner and are formed in a circumferential array around the central axis of the hollow rotating shaft on the first and second spiral pushing blades on the front and back sides in the fourth mixing area.

[0019] As a further improvement of the technical solution, the heights of the first, second, third and fourth water passages gradually increase along the sludge pushing direction, and the widths of the first, second, third and fourth water passages gradually decrease along the sludge pushing direction.

[0020] Preferably, the sewage separation area comprises a second, third, fourth and fifth sewage separation area in the order of the pitch overlap area of the first and second spiral pushing blades at the rear end of the first sewage separation area.

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

[0022] The heights of the rotating rods and rotating blades of the first, second and third mixing assemblies are respectively matched with the heights of the corresponding water passages on the second spiral pushing blades at the front end of the second, third and fourth sewage separation area, and the rotating blades of the first, second and third mixing assemblies are respectively inclined to the corresponding water passages on the second spiral pushing blades at the front end of the second, third and fourth sewage separation area.

[0023] Preferably, a first rotating shaft in a conical structure is arranged at the rear end of the fifth sewage separation area on the hollow rotating shaft, the first rotating shaft has a structure of being narrow in front and wide in back along the sludge pushing direction, and the first and second spiral pushing blades 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 the technical solution, a plurality of fifth water passages are arranged in a staggered manner on the spiral blades of the first and second spiral pushing blades near the rear end of the fifth sewage separation area, the height of the fifth water passage is lower than that of the fourth water passage, and the width of the fifth water passage is wider than that of the fourth water passage.

[0025] The sewage separation zone located in the first rotation shaft interval is not provided with a mixing component, and the upper portions of the first spiral pushing blade and the second spiral pushing blade located at the rear end of the clean water pushing zone are provided with water outlets.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] 1. In the high-dryness centrifugal dewatering and sludge drying and incineration device, a multi-stage gradient extrusion and layered screening mechanism is realized, the height of the water outlet (the height of the first to fourth water outlets increases) and the width of the opening gradually decrease along the sludge pushing direction, and an axial extrusion gradient is formed. Specifically, the high opening at the front end screens the sludge with high water content for secondary treatment, and the low opening at the rear end accurately traps the dry sludge with low water content. The gradient design forms a dynamic layering (outer layer with low water content / inner layer with high water content) in the rotating drum, and compared with the traditional uniform extrusion mode, the solid phase recovery rate is improved, and the water content of the sludge cake is reduced.

[0028] 2. In the high-dryness centrifugal dewatering and sludge drying and incineration device, two groups of spiral pushing blades with the same structure and a spacing are arranged on the hollow rotating shaft, and the water outlets with gradually increasing height and gradually narrowing width along the sludge pushing direction are arranged on the blades. During the pushing process, the sludge layer with lower water content is gradually pushed to the sludge injection port, and the sludge with higher water content and sewage flow into the rear interval through the water outlet for further flocculant mixing and sludge separation, which is beneficial to realize the step-by-step separation of sludge and the effective discharge of clean water, thereby improving the sludge dewatering efficiency and water quality.

[0029] 3. In the high-dryness centrifugal dewatering and sludge drying and incineration device, a mixing component for mixing sewage and flocculants is arranged in the sewage separation zone, including a rotating rod and a rotating blade. The rotating blade of the mixing component is inclined to the water outlet, which can use the flow velocity of the sewage to impact the rotating blade, so that the rotating rod and the rotating blade rotate, thereby increasing the mixing degree of the sewage and the flocculants, facilitating the improvement of the mixing effect of the sewage and the flocculants, ensuring that the sludge can be fully flocculated before separation, and further improving the sludge dewatering efficiency and the clarity of the water.

[0030] 4. In the high-dryness centrifugal dewatering and sludge drying and incineration device, a first rotating shaft with a conical structure is arranged at the rear end of the fifth sewage separation zone. The conical structure of the first rotating shaft can reduce the distance between the first rotating shaft and the inner wall of the rotating drum, increase the water pressure of the clean water pushing zone, and the outer diameter of the first rotating shaft increases as it gets closer to the water outlet, thereby increasing the drainage speed of the water outlet and improving the overall sewage treatment efficiency.

[0031] 5. In the high-dryness centrifugal dehydration coupled sludge drying and incineration device, through the alternating arrangement of sewage separation zones and sewage mixing zones, the drum is equipped with two sets of spiral pushing blades through the feed port and is divided into a sludge pushing zone, several sewage separation zones and several sewage mixing zones in sequence starting from the end near the mud spraying port. The sewage mixing zone is located at the front end of the sewage separation zone along the sludge pushing direction, so that the sewage increases its residence time in the mixing zone, which is convenient for further reaction between the flocculant and the sewage. After passing through the sewage mixing zone, it enters the sewage separation zone, which is conducive to more complete sludge centrifugal separation of the sewage and improves the solid-liquid separation effect. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0036] Figure 5 It is a structural schematic diagram of the sludge separation zone of the spiral pushing assembly of the present invention;

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

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

[0039] Figure 8 This is a schematic structural diagram of the first spiral pusher blade of the present invention;

[0040] Figure 9 It is a structural schematic diagram of the water outlet of the present invention.

[0041] The meaning of each number in the figure is:

[0042] 1, support; 2, rotating drum; 3, sludge injection port; 4, water outlet pipe; 5, hollow rotating shaft; 6, first rotating shaft; 7, first spiral pushing blade; 8, second spiral pushing blade; 9, feeding port; 10, sludge pushing area; 11, first sewage separation area; 12, first mixing area; 13, second sewage separation area; 14, first mixing assembly; 15, second mixing area; 16, third sewage separation area; 17, second mixing assembly; 18, third mixing area; 19, fourth sewage separation area; 20, third mixing assembly; 21, fourth mixing area; 22, fifth sewage separation area; 23, clean 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 DESCRIPTION

[0044] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

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

[0046] Therefore, the present application provides a high-dryness centrifugal dewatering coupled sludge drying and incineration device, as shown in Figures 1-2 The device comprises a support 1, the support 1 is provided with a rotating drum 2, one end of the rotating drum 2 is provided with a sludge injection port 3, and the other end of the rotating drum 2 is provided with a water outlet pipe 4. A hollow rotating shaft 5 is rotatably arranged in the rotating drum 2. A feeding port 9 is formed in the hollow rotating shaft 5. Sewage and flocculants enter the rotating drum 2 through the feeding port 9. Two groups of spiral pushing blades adapted to the rotating drum 2 are arranged on the hollow rotating shaft 5 along the central axis direction. The rotating drum 2 is divided into a sludge pushing area 10, a sludge treatment area and a clean water pushing area 23 in sequence from the end close to the sludge injection port 3 through the feeding port 9 in cooperation with the two groups of spiral pushing blades. The sludge treatment area is composed of a plurality of sewage separation areas and a plurality of sewage mixing areas arranged alternately. Except for the sewage separation area arranged at the most front end, the sewage mixing area is located at the front end of the sewage separation area along the sludge pushing direction. In this way, the sewage is subjected to centrifugal separation of sludge after passing through the sewage mixing area and then entering the sewage separation area.

[0047] The sewage separation zone and the mixing zone are arranged in an alternating structure (for example, the second sewage separation zone 13 is adjacent to the first mixing zone 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" in which the treatment intensity increases with the process.

[0048] For details, see Figures 2-3 and Figure 5 As shown, the two groups 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 therebetween. The first spiral pushing blade 7 is arranged at the front end of the second spiral pushing blade 8 along the sludge pushing direction, and the interval between the sludge pushing zone 10 and 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 zone 11. The sewage mixing zones formed by the pitch difference of the first spiral pushing blade 7 and the second spiral pushing blade 8 at the rear end of the first sewage separation zone 11 are the first mixing zone 12, the second mixing zone 15, the third mixing zone 18 and the fourth mixing zone 21, respectively.

[0049] Among them, such as Figure 3 and Figures 8-9 As shown, a plurality of first water outlets 24 are cross-arranged in a circular array around the central axis of the hollow rotating shaft 5 on the first spiral push blades 7 and the second spiral push blades 8 on the front and rear sides of the first mixing zone 12; a plurality of second water outlets 25 are cross-arranged in a circular array around the central axis of the hollow rotating shaft 5 on the first spiral push blades 7 and the second spiral push blades 8 on the front and rear sides of the second mixing zone 15; a plurality of third water outlets 26 are cross-arranged in a circular array around the central axis of the hollow rotating shaft 5 on the first spiral push blades 7 and the second spiral push blades 8 on the front and rear sides of the third mixing zone 18; a plurality of fourth water outlets 27 are cross-arranged in a circular array around the central axis of the hollow rotating shaft 5 on the first spiral push blades 7 and the second spiral push blades 8 on the front and rear sides of the fourth mixing zone 21.

[0050] These intersecting water inlets form a circumferential turbulent mixing enhancement system. The mixing zone utilizes a staggered water inlet design (for example, the first mixing zone 12 can have 24 water inlets arranged in a 30-degree cross pattern). Combined with a mixing assembly (rotating blades 142 can be distributed 120 degrees around the circumference), high-speed water flows through the variable-section water inlets, generating a vortex street effect that drives the rotating blades 142 to rotate, creating a three-dimensional shear flow field.

[0051] It should be noted that if Figure 4 and Figure 9As shown, the heights of the first water pass 24, the second water pass 25, the third water pass 26 and the fourth water pass 27 gradually increase along the sludge pushing direction, that is, the height of the end of the water pass between the several sewage mixing zones gradually decreases along the distance between the sludge pushing direction and the inner wall of the rotating drum 2, the width of the first water pass 24, the second water pass 25, the third water pass 26 and the fourth water pass 27 gradually narrows along the sludge pushing direction, that is, the water pass of each sewage separation zone and sewage mixing zone on the front end of the hollow rotating shaft 5 near the feed inlet 9 is higher, so that the sludge exceeding the end of the water pass is only the sludge above the end of the water pass, that is, between the end of the water pass and the inner wall of the rotating drum 2, is pushed out, and it is known by centrifugal force that the sludge closer to the inner wall of the rotating drum 2 has lower water content, so that the sludge with lower water content is pushed to the sludge nozzle 3 by such arrangement, and the sludge with relatively high water content flows into the rear end zone for further mixing of flocculating agent and separation of sludge and sewage, enters the next zone, and the sludge closer to the inner wall of the rotating drum 2 is also pushed out, the sludge exceeding the end of the water pass continues to enter the next zone for treatment, and so on.

[0052] The gradual change of the height and width of the water pass, the gradual increase of the height of the water pass along the sludge pushing direction and the gradual narrowing of the width, enables the sludge layer (with lower water content) closer to the inner wall of the rotating drum 2 to be gradually pushed to the sludge nozzle 3, and the sludge with higher water content and sewage to flow to the rear end zone through the gradually widened and lowered water pass for treatment, which is beneficial to realize the gradual dehydration of the sludge and improve the dehydration efficiency and quality.

[0053] Further, 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 of each pitch overlap zone of the helical blades of the first helical pushing blade 7 and the second helical pushing blade 8 located at the rear end of the first sewage separation zone 11; the first rotating shaft 6 in 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 of being narrow in front and wide in back along the sludge pushing direction, the first helical pushing blade 7 and the second helical pushing blade 8 at the rear end of the fifth sewage separation zone 22 are connected with the hollow rotating shaft 5 through the first rotating shaft 6; a plurality of fifth water passes 28 are staggered and arranged on the helical blades of the first helical pushing blade 7 and the second helical pushing blade 8 near the rear end of the fifth sewage separation zone 22, the height of the fifth water pass 28 is lower than the height of the fourth water pass 27, and the width of the fifth water pass 28 is wider than the width of the fourth water pass 27.

[0054] Further, referring to Figure 3 and Figures 5-7As shown, the several sewage separation zones are provided with mixing assemblies for mixing sewage and flocculants, and the sewage separation zones located in the interval of the first rotating shaft 6 are not provided with mixing assemblies, and the first spiral pushing blade 7 and the second spiral pushing blade 8 located at the rear end of the clean water pushing area 23 are provided with water outlets at the upper portions; wherein the mixing assemblies include the first mixing assembly 14, the second mixing assembly 17 and the third mixing assembly 20 located in the second sewage separation zone 13, the third sewage separation zone 16 and the fourth sewage separation zone 19 respectively, and the mixing assemblies all include rotating rods 141 rotatingly connected to the hollow rotating shaft 5, and the rotating rods 141 are circumferentially and arrayed provided with a plurality of rotating blades 142 around the center of the rotating rods 141; 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 matched with the heights of the corresponding water outlets of the second spiral pushing blade 8 at the front end of 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 assembly 14, the second mixing assembly 17 and the third mixing assembly 20 are respectively inclined to the corresponding water outlets of the second spiral pushing blade 8 at the front end of the second sewage separation zone 13, the third sewage separation zone 16 and the fourth sewage separation zone 19.

[0055] In summary, by forming the "gradient extrusion-dynamic mixing-hydraulic strengthening" trinity processing system, the problems of insufficient solid-liquid separation caused by the lack of axial extrusion gradient of the spiral conveyor and the uneven dispersion of flocculants caused by the insufficient circumferential mixing efficiency of the existing centrifugal sludge dewatering equipment are effectively solved, which jointly restrict the sludge dewatering efficiency and the water quality.

[0056] Working principle:

[0057] The device in working, the sewage to be handled and flocculants are discharged into the hollow shaft 5, 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 shaft 5, then the rotating drum 2 rotates at high speed, the sludge and water are separated, because the interval of the sludge pushing area 10 and the first sewage separation area 11 is short, so the sewage entering the two intervals in the traditional device is not completely separated, that is, the sludge with high water content is pushed into the mud injection port 3 by the spiral blade in the sludge pushing area 10 and discharged; and the present application is provided with the water overflow port with the height gradually increasing along the sludge pushing direction in the first sewage separation area 11 and the spiral blade at the rear end, so that the outermost sludge layer is pushed into the sludge pushing area 10 by the spiral blade at the rear end of the first sewage separation area 11 and then sent to the mud injection port 3 for discharge, and we know that due to the centrifugal force, the sludge layer close to the inner wall of the rotating drum 2 has low water content, and the sludge layer close to the inner side and having large water contact surface has high water content, so due to the different height of the water overflow port, the spiral blade near the first sewage separation area 11 can take away the innermost sludge layer, and the sludge layer with high water content and sewage flow into the second sewage separation area 13 through the first water overflow port 24 at the front end of the second sewage separation area 13, that is, the rear end of the first sewage separation area 11;

[0058] Before flowing into the second sewage separation area 13, the sewage will first pass through the first mixing area 12, because the first water overflow ports 24 on both sides of the first mixing area 12 are staggered, so that the sewage increases the residence time in this interval, and the flocculants and the sewage further react, and then enter the second sewage separation area 13 for separation, and at the same time, in order to prevent uneven mixing of flocculants or insufficient aging, the first mixing assembly 14 in the second sewage separation area 13 is used to increase the mixing of sewage and flocculants, because the sewage close to the first sewage separation area 11 needs to be treated, the mixing of sewage and flocculants, because they do not stay in the rotating drum 2 for long enough, so the first water overflow port 24 is the highest in height and the narrowest in width, as explained above, the highest height is to make the top end of the water overflow 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 that the sludge layer close to the inner wall of the rotating drum 2 can be pushed, because the sludge layer close to the inner wall of the rotating drum 2 has lower water content; and the first water overflow port 24 is the narrowest, because the sewage in the second sewage separation area 13 needs more stirring force to mix the sewage and flocculants, so the first water overflow port 24 is the narrowest, the flow rate of the sewage passing through the first water overflow port 24 is the fastest, so that the rotating blade 142 on the first mixing assembly 14 is impacted and rotated, that is, stirred faster, increasing the mixing of sewage and flocculants in the second sewage separation area 13.

[0059] And when the sewage in the second sewage separation zone 13 is further mixed and separated, the second water outlet 25 on the spiral blade near the rear end of the second sewage separation zone 13 begins to play a role, the height of the second water outlet 25 is lower than that of the first water outlet 24, then because the content of sludge in the sewage treated by the first sewage separation zone 11 begins to decrease, and the reaction effect of the flocculating agent and the sewage is further improved, the clean water in the third sewage separation zone 16 will be more than that in the second sewage separation zone 13, then the second water outlet 25 on the spiral blade at the rear end of the second sewage separation zone 13, that is, the front end of the third sewage separation zone 16, is designed to be lower than the first water outlet 24, so that more sludge with lower water content than the second sewage separation zone 13 is pushed, and the remaining sludge with more water content and sewage flow into the second mixing zone 15 through the second water outlet 25, enter the second mixing zone 15, increase the residence time through the second water outlet 25 staggered on both sides of the second mixing zone 15, mix the flocculating agent and the sewage, then enter the third sewage separation zone 16 and impact the second mixing assembly 17 in the third sewage separation zone 16, the height of the rotating rod 141 on the second mixing assembly 17 is matched with the second water outlet 25, so that it is impacted and rotated, further stirring to improve the mixing degree of the sewage and the flocculating agent, and continue to lay the foundation for the sewage entering the next third mixing zone 18 and fourth sewage separation zone 19.

[0060] Similarly, the third mixing zone 18 and the fourth sewage separation zone 19 and the fourth mixing zone 21 are the above-mentioned process of separating and pushing the sludge and clean water, the rear end interval can separate the remaining untreated sludge in the front end interval, and the sludge layer with lower water content is gradually pushed to the mud outlet 3, and the clean water flows through the gradually widened and lowered water outlet to the water outlet pipe 4.

[0061] When the sludge is almost processed, it enters the area at the rear end of the fifth sewage separation zone 22, which is mainly for water purification, that is, the area between the fifth sewage separation zone 22 and the clean water push zone 23. Since this area is mainly for water purification, it may contain a small amount of impurities. Therefore, there are still water outlets at the front and back ends of the fifth sewage separation zone 22 to intercept and increase the reaction time. Then there is no first mixing component 14 for mixing because the previous treatment has roughly met the requirements. At the same time, since the hollow shaft 5 located between the fifth sewage separation zone 22 and the clean water push zone 23 has a first rotating shaft 6 with a conical structure, it is not convenient to set the first mixing component 14. The setting of 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, and increase the pushing water pressure in the clean water push zone 23. As the outer diameter of the first rotating shaft 6 increases closer to the outlet pipe 4, the drainage of the water outlet will be faster, which can improve the overall sewage treatment efficiency. The lack of water outlets on the spiral blades of the first spiral push blade 7 and the second spiral push blade 8 in this area can adapt to the demand for increased 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 to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-dryness centrifugal dehydration coupled sludge drying and incineration device, comprising a bracket (1), a drum (2) provided on the bracket (1), a mud spraying port (3) provided at one end of the drum (2), and a water outlet pipe (4) provided at the other end thereof, a hollow rotating shaft (5) rotatably provided in the drum (2), a feed port (9) provided on the hollow rotating shaft (5), and characterized in that: Two sets of spiral push blades are provided on the hollow rotating shaft (5) along the central axis thereof, and the rotating drum (2) is matched with the two sets of spiral push blades. The rotating drum (2) is divided into a sludge pushing area (10), a sludge treatment area and a clean water pushing area (23) in sequence from the end adjacent to the mud spraying port (3) through the feed port (9). The sewage treatment area is composed of several sewage separation areas and several sewage mixing areas arranged alternately, and several sewage separation areas are provided with mixing components for mixing sewage and flocculants; In addition to the sewage separation zone located at the front end, the sewage mixing zone is located at the front end of the sewage separation zone along the sludge pushing direction; The sewage mixing zone is composed of the spacing between two groups of spiral pushing blades, and the spiral pushing blades on both sides of the sewage mixing zone are provided with a plurality of cross-arranged water outlets, and the height of the distance between the ends of the water outlets between the plurality of sewage mixing zones and the inner wall of the drum (2) decreases step by step along the sludge pushing direction; The mixing assembly is driven by the water flow from the water outlet to rotate, stir and mix the sewage.

2. The high-dryness centrifugal dehydration coupled sludge drying and incineration device according to claim 1 is characterized by: The two groups 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) having the same structure and a spacing therebetween. 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 dehydration coupled sludge drying and incineration device according to claim 2 is characterized by: The first sewage separation zone (11) is located adjacent to the sludge pushing zone (10) and 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).

4. The high-dryness centrifugal dehydration coupled sludge drying and incineration device according to claim 3 is characterized by: The sewage mixing zones formed by the pitch difference between the first spiral push blade (7) and the second spiral push blade (8) at the rear end of the first sewage separation zone (11) are the first mixing zone (12), the second mixing zone (15), the third mixing zone (18) and the fourth mixing zone (21).

5. The high-dryness centrifugal dehydration coupled sludge drying and incineration device according to claim 4 is characterized in that: A plurality of first water outlets (24) are cross-arranged on the first spiral push blade (7) and the second spiral push blade (8) on the front and rear sides of the first mixing zone (12) in a circular array around the central axis of the hollow rotating shaft (5); A plurality of second water outlets (25) are cross-arranged on the first spiral push blade (7) and the second spiral push blade (8) on the front and rear sides of the second mixing zone (15) in a circular array around the central axis of the hollow rotating shaft (5); A plurality of third water outlets (26) are cross-arranged on the first spiral push blade (7) and the second spiral push blade (8) on the front and rear sides of the third mixing zone (18) in a circular array around the central axis of the hollow rotating shaft (5); A plurality of fourth water outlets (27) are cross-arranged in a circular array around the central axis of the hollow rotating shaft (5) on the first spiral push blade (7) and the second spiral push blade (8) on the front and rear sides of the fourth mixing zone (21).

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

7. The high-dryness centrifugal dehydration coupled sludge drying and incineration device according to claim 6 is characterized by: The sewage separation zone comprises a second sewage separation zone (13), a third sewage separation zone (16), a fourth sewage separation zone (19) and a fifth sewage separation zone (22), which are respectively located at the rear end of the first sewage separation zone (11) and the respective pitch overlap intervals of the spiral blades of the second spiral pusher blade (8).

8. The high-dryness centrifugal dehydration coupled sludge drying and incineration device according to claim 7 is characterized by: The mixing assembly comprises a first mixing assembly (14), a second mixing assembly (17) and a third mixing assembly (20) respectively located in the second sewage separation zone (13), the third sewage separation zone (16) and the fourth sewage separation zone (19), and each of the mixing assemblies comprises a rotating rod (141) rotatably connected to the hollow rotating shaft (5), and a plurality of rotating blades (142) are fixedly provided on the rotating rod (141) in a circular array around the center of the circle; 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 outlets on the second spiral push blades (8) at the front ends of 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 assembly (14), the second mixing assembly (17) and the third mixing assembly (20) are respectively obliquely aligned with the corresponding water outlets on the second spiral push blades (8) at the front ends of the second sewage separation zone (13), the third sewage separation zone (16) and the fourth sewage separation zone (19).

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

10. The high-dryness centrifugal dehydration coupled sludge drying and incineration device according to claim 9, characterized in that: A plurality of fifth water outlets (28) are staggeredly provided on the spiral blades of the first spiral push blade (7) and the second spiral push blade (8) adjacent to the rear end of the fifth sewage separation zone (22), wherein the height of the fifth water outlet (28) is lower than the height of the fourth water outlet (27) and the width is wider than the width of the fourth water outlet (27); The sewage separation zone located in the first rotating shaft (6) section is not provided with a mixing component, and a water outlet is provided on the upper parts of the first spiral push blade (7) and the second spiral push blade (8) located at the rear end of the clean water push zone (23).

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