Drum-type sludge drying machine

Abstract

The invention relates to a drum-type sludge drying machine which comprises a rack, at least two drums and a power device, and the multiple drums are arranged up and down and communicated to form a roundabout sludge channel; the sludge drying machine further comprises a hot air drying unit. On one hand, on the basis that hot dry air keeps reverse contact with sludge, the hot dry air absorbs moisture in sludge blocks, meanwhile, the sludge blocks are conveyed based on detouring and scattering of the roller, and the hot dry air makes contact with the inner wall of the roller and the guide flow, the effective contact area of the sludge blocks and the hot dry air is greatly increased; the staying time of the sludge blocks in the roller is effectively prolonged by dispersed transmission formed by the sectional type flow deflectors, so that the drying of the sludge blocks is efficiently completed; on the other hand, hot dry air can circularly enter the sludge channel, heat of gas discharged out of the sludge channel is recycled, energy consumption of the hot air dehumidifier is reduced, the sludge block drying cost is greatly reduced, in addition, sludge odor is not prone to leakage, and the operation environment is clean and tidy.

Description

Technical Field

[0001] The invention belongs to the field of sludge processing equipment, and in particular relates to a drum type sludge drying machine. Background Art

[0002] Sludge drying is the process of removing most of the water content from the concentrated and dehydrated sludge blocks through filtration or evaporation (generally, the water content of the sludge blocks is about 75%, and the water content of the sludge blocks after drying is about 40%). This process aims to reduce the volume and weight of the sludge blocks for subsequent treatment and resource utilization. At the same time, sludge drying not only helps to improve the environmental characteristics of sludge, but also significantly improves its treatment efficiency and economic benefits.

[0003] At present, for the evaporation of sludge cakes, it is mainly heated by a drum, and then the generated hot air is recovered for energy to complete the drying of the sludge cakes in motion.

[0004] However, the above-mentioned sludge block drying has the following technical defects:

[0005] 1) During the evaporation process, due to the continuous layout of the spiral guide vanes inside the drum, the sludge blocks can stay in the drum for a short time. Therefore, in order to achieve the desired drying effect, the drum can only be lengthened, which not only increases the space occupied by the equipment, but also increases the difficulty of heating the drum itself. At the same time, the probability of the sludge blocks turning over is relatively low, resulting in a small heat exchange contact surface formed by the sludge blocks and the contact surface cannot be changed. Therefore, under the same drying quality, the required energy consumption is very large, resulting in high drying costs;

[0006] 2) The evaporated hot air cannot be discharged directly. It not only contains harmful gases and soil particles, but also the heat energy generated needs to be recovered. Therefore, a set of waste gas treatment equipment is also required, which leads to high manufacturing and use costs of the entire equipment, which is not conducive to market promotion. Summary of the invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide an improved drum-type sludge drying machine.

[0008] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0009] A drum type sludge drying machine comprises a frame, a drum with a horizontal axis, and a power device for driving the drum to rotate. In particular, there are at least two drums, and the multiple drums are arranged up and down and connected to form a circuitous sludge channel, wherein the head end and the tail end of the sludge channel respectively form a sludge inlet and a sludge outlet, and each upper and lower adjacent drums rotate towards each other, and the inner wall of each drum is provided with a segmented guide plate capable of throwing sludge blocks to the middle, and the sludge blocks formed by each upper and lower adjacent drums are transmitted in opposite directions; the power device drives any one or more of the multiple drums to rotate synchronously;

[0010] The sludge drying machine also includes a hot air drying unit, which includes a hot air inlet channel and a hot air exhaust channel connected to the sludge channel, and a hot air dehumidifier, wherein the hot air inlet channel is located at the end of the lowermost drum, and the hot air inlet channel is located at the end of the uppermost drum. The hot air formed by the hot air dehumidifier enters the hot air inlet channel and contacts the sludge block and is discharged from the hot air exhaust channel in the opposite direction to the transmission direction of the sludge block, and the exhausted gas flows back to the hot air dehumidifier to form a hot dry air circulation.

[0011] Preferably, each drum includes a drum body with segmented guide vanes formed inside, and drum seat sleeves formed at both ends of the drum body, wherein the drum seat sleeves are fixed on the frame, and the drum body is rotatably arranged relative to the drum seat sleeves. This meets the need for self-rotation installation, and at the same time, the sludge channel can be relatively closed, so that the sludge is dried with hot air in a relatively sealed space to remove moisture in the sludge, thereby achieving the required drying effect.

[0012] According to a specific implementation and preferred aspect of the present invention, each drum seat sleeve is aligned from the end of the frame in the vertical direction; each drum body is aligned up and down and arranged at equal intervals, which is not only convenient for assembly, but also convenient for synchronous transmission between the two drums.

[0013] According to another specific implementation and preferred aspect of the present invention, the sludge inlet and the sludge outlet are respectively located on the top and bottom corresponding cartridge sleeves; the hot air inlet channel and the hot air outlet channel are respectively located on the bottom and top corresponding cartridge sleeves; wherein the sludge inlet and the hot air outlet channel are located on the same cartridge sleeve; the sludge outlet and the hot air inlet channel are located on the same cartridge sleeve. The sludge direction formed is opposite to the airflow direction.

[0014] Preferably, the number of hot air inlet channels and hot air outlet channels is N, where N≥1 and is an integer. In this way, the one or more incoming air streams can contact the sludge more comprehensively and remove moisture from the sludge blocks more efficiently and with higher quality.

[0015] According to another specific implementation and preferred aspect of the present invention, an inflow comber and an inflow guide channel are further provided at the sludge inlet, wherein the inflow comber can disperse the sludge blocks into the inflow guide channel, and the inflow guide channel avoids the segmented guide plate and accelerates the unloading of the sludge blocks downward and inward. Based on the feed dispersion and accelerated unloading of the sludge blocks, not only the blockage of the inflow is reduced, but also the sludge blocks can be scattered, the feed accumulation is reduced, and the heat exchange efficiency is improved.

[0016] Preferably, the inflow comber comprises a silo with an inlet and an outlet, and a dispersing impeller rotating in a horizontal direction, wherein the dispersing impeller and the interior of the silo cooperate to form a plurality of combing chambers, and the sludge blocks entering each combing chamber in sequence are gradually unloaded through the outlet to the inflow guide channel under the self-rotation of the dispersing impeller. The clogging is reduced based on the combing, and the sludge blocks are relatively broken up based on the dispersing.

[0017] Furthermore, an outflow distributor with the same structure as the inflow comber is provided at the sludge outlet, wherein the dispersing impeller of the outflow distributor rotates to gradually discharge the sludge blocks entering each distribution chamber from the outlet, thereby avoiding blockage of the discharge.

[0018] According to another specific implementation and preferred aspect of the present invention, the frame is further provided with a supporting roller group for rolling the supporting roller. Under the rigid support provided by the supporting roller group, the stability of rolling and rotation is improved.

[0019] Preferably, the support roller group includes a plurality of support rollers tangent to each roller and distributed around the circumference of the roller; there are multiple groups of support rollers, which are spaced apart along the length direction of the roller. Based on the tangent auxiliary roller self-rotation, multiple support roller groups can also provide support and positioning more evenly.

[0020] According to another specific implementation and preferred aspect of the present invention, a gear plate is provided on the circumference of each roller, and each two adjacent rollers above and below are meshed and rotate synchronously through the gear plate. Based on the meshing transmission of the gears, opposite and synchronous rotation is achieved.

[0021] In some specific embodiments, the power device includes a power gear mounted on a frame and meshed with a gear plate, and a power motor driving the power gear to rotate.

[0022] In addition, the hot air drying unit also includes a solid-gas separator, in which the gas discharged from the hot air discharge channel is solid-gas separated, and the separated gas flows back to the hot air dehumidifier to form a hot dry air cycle, thereby preventing sludge particles from entering the hot air dehumidifier and causing machine wear.

[0023] Preferably, there are two drums, and the sludge inlet, sludge outlet, hot air inlet channel, and hot air outlet channel are located on the same side of the frame, wherein the sludge inlet and hot air outlet channel are connected to the upper drum; the sludge outlet and hot air inlet channel are connected to the lower drum. That is, double-drum sludge drying.

[0024] Alternatively, there are three drums, the sludge inlet and the hot air discharge channel are connected to the top drum, the sludge outlet and the hot air inlet channel are connected to the bottom drum, and the sludge inlet and the sludge outlet, and the hot air inlet channel and the hot air discharge channel are respectively located at the upper and lower parts of the opposite sides of the frame. That is, three-drum sludge drying. Generally, there will be no more than three drums, because the airflow formed by too many drums cannot effectively implement heat exchange flow, which will also reduce the sludge drying efficiency, and will also increase the equipment use cost and installation space.

[0025] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art:

[0026] In the existing sludge block drying, during the evaporation process, due to the continuous layout of the spiral guide plates inside the drum, the sludge blocks can stay in the drum for a short time. Therefore, in order to achieve the desired drying effect, the drum can only be lengthened, which not only increases the space occupied by the equipment, but also increases the difficulty of heating the drum itself; at the same time, the probability of the sludge blocks flipping over is relatively low, resulting in a small heat exchange contact surface formed by the sludge blocks and the contact surface cannot be changed. Therefore, under the same drying quality, the required energy consumption is very large, resulting in high drying costs; in addition, the evaporated hot air cannot be discharged directly, and not only contains harmful gases and soil particles, but also the generated heat energy needs to be recovered. Therefore, a set of waste gas treatment equipment is also required, resulting in high manufacturing and use costs of the entire equipment, which is not conducive to market promotion and other deficiencies. The present application cleverly solves the various deficiencies of the existing structure by overall design of the structure of the drum-type sludge dryer. When the drum type sludge dryer is used, the sludge blocks enter the sludge channel from the sludge inlet and are transmitted in a circuitous manner along the sludge channel from top to bottom. At the same time, the sludge blocks are scattered to the middle by the segmented guide vanes, and then hot dry air is introduced into the sludge channel, and the hot dry air contacts the scattered sludge blocks and absorbs moisture in the sludge blocks, and the airflow direction is opposite to the circuitous transmission direction of the sludge blocks, and finally discharged from the sludge channel, and the discharged gas flows back to the hot air dehumidifier again, and the sludge blocks are dried in the hot dry air circulation, and the dried sludge blocks are discharged from the sludge outlet. Therefore, on the one hand, the present invention is based on the hot dry air and the sludge maintaining reverse contact, and the hot dry air absorbs the moisture in the sludge blocks. At the same time, the sludge blocks are transmitted based on the circuitous and scattered transmission of the drum, and the contact between the hot dry air and the inner wall of the drum and the guide, which greatly increases the effective contact area between the sludge blocks and the hot air drying, and the dispersed transmission formed by the segmented guide vanes effectively prolongs the sludge blocks. The residence time in the drum is increased to efficiently complete the drying of the sludge blocks; on the other hand, the hot dry air can circulate into the sludge channel, which not only recovers the heat of the gas discharged from the sludge channel, but also reduces the energy consumption of the hot air dehumidifier, and greatly reduces the cost of drying the sludge blocks (calculated based on the treatment of one ton of sludge blocks with a moisture content of 80% to a moisture content of 40%, and its comprehensive power consumption is only about 60 degrees). In addition, the air-drying section of the equipment adopts the principle of heat pump dehumidification, uses multiple cylinders as drying carriers, and uses a closed space design and circulating transportation, which greatly improves the effective utilization rate of hot air. The sludge blocks in the cylindrical structure are scattered and segmented guide vanes, which can make the sludge blocks evenly scattered at high speed in the cylinder, greatly increasing the contact surface and contact rate between the sludge and the hot dry air, thereby achieving deep air drying and dehydration. At the same time, the entire drying system is a fully enclosed structure, the sludge odor is not easy to leak out, the implementation of sludge odor solution is simple, and the working environment is clean and tidy. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0028] Figure 1It is a front view schematic diagram of a three-drum sludge drying machine of Example 1;

[0029] Figure 2 It is a left side schematic diagram of Example 1 (partially omitted);

[0030] Figure 3 for Figure 1 A half-section diagram of

[0031] Figure 4 for Figure 3 AA section view;

[0032] Figure 5 for Figure 1 Schematic diagram of the structure of the middle drum;

[0033] Figure 6 for Figure 5 A half-section diagram of

[0034] Figure 7 It is a front view schematic diagram of a double-drum sludge drying machine of Example 2;

[0035] Figure 8 for Figure 7 Schematic diagram of the left side;

[0036] Fig. 9 for Figure 7 BB-direction cross-sectional view;

[0037] Fig.10 for Figure 7 Schematic diagram of CC section;

[0038] Among them: 1. Rack;

[0039] 2, roller; 20, drum body; 21, drum seat sleeve; s, guide plate; s1, arc-shaped sheet group; s10, arc-shaped segment body; s2, dispersed sheet group; s20, dispersed monomer; a1, base plate; b1, first folding plate; c1, second folding plate; Q, mud turning spoon area;

[0040] 3. Power device; 30. Power gear; 31. Power motor;

[0041] 4. Hot air drying unit; 4a. Hot air inlet channel; 4b. Hot air outlet channel; 4c. Hot air dehumidifier; 4d. Solid-gas separator;

[0042] 5. Gear plate;

[0043] 6. Inflow comber; 60. Silo; 61. Dispersing impeller;

[0044] 7. Inflow guide channel;

[0045] 8. Outflow distributor; 80. Unloading bin; 81. Unloading impeller;

[0046] 9. Support roller assembly; 90. Support roller. DETAILED DESCRIPTION

[0047] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0048] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the present invention, unless otherwise clearly defined and specified, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the invention, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0052] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0053] Example 1

[0054] like Figures 1 to 6 As shown, the drum-type sludge drying machine involved in this embodiment includes a frame 1, a drum 2 with a horizontal axis, a power device 3 for driving the drum 2 to rotate, and a hot air drying unit 4, wherein there are three drums 2, and the three drums 2 are arranged up and down and connected to form a circuitous sludge channel (left and right direction), wherein the head end and the tail end of the sludge channel respectively form a sludge inlet a and a sludge outlet b; the hot air drying unit 4 includes a hot air inlet channel 4a and a hot air outlet channel 4b connected to the sludge channel, a hot air dehumidifier (heat pump dehumidification) 4c, and a solid-gas separator 4d. , wherein the hot air inlet channel 4a is located at the end of the lowermost drum 2, and the hot air inlet channel 4b is located at the end of the uppermost drum 2. The hot air formed by the hot air dehumidifier 4c enters the hot air inlet channel 4a and contacts with the sludge block and is discharged from the hot air discharge channel 4b in the opposite direction of the sludge block transmission direction, and the discharged gas is subjected to solid-gas separation (i.e., enters the solid-gas separator 4d, using a conventional cyclone separator), and the separated gas flows back to the hot air dehumidifier 4c to form a hot dry air circulation. At the same time, it also prevents sludge particles from entering the hot air dehumidifier and causing machine wear.

[0055] Specifically, each drum 2 includes a drum body 20 with segmented guide vanes s formed inside, and drum seat sleeves 21 formed at both ends of the drum body 20, wherein the drum seat sleeves 21 are fixed on the frame 1, and the drum body 20 is rotatably arranged relative to the drum seat sleeves 21. This meets the need for self-rotation installation, and at the same time, the sludge channel can be relatively closed, so that the hot air drying of the sludge is implemented in a relatively sealed space to take away the moisture in the sludge, so as to achieve the required drying effect.

[0056] In some specific embodiments, each cylinder seat sleeve 21 is aligned from the end of the frame 1 in the up and down direction; each cylinder body 20 is aligned up and down and arranged at equal intervals. It is not only convenient for assembly, but also convenient for synchronous transmission between the two rollers. As for the inner diameter of each cylinder body 20, it can be the same or the inner diameter of the middle roller is large, and the inner diameters of the upper and lower rollers are small and equal. At the same time, a gear plate 5 is provided on the circumference of each roller 2, and each two adjacent rollers 2 above and below are meshed and rotated synchronously through the gear plate 5. Based on the meshing transmission of the gears, opposite and synchronous rotation is achieved. The power device 3 includes a power gear 30 installed on the frame 1 and meshed with the gear plate 5, and a power motor 31 that drives the power gear 30 to rotate.

[0057] In this example, the three rollers 2 are divided into the upper one, the middle two, and the lower three, and are all arranged horizontally. The circuitous way of the circuitous channel is as follows: the right end of the upper one is the head end, and from the head end to the left horizontally, the connecting channel enters from the left end of the middle two downwards and extends to the right, and then enters from the right end of the lower three downwards and extends to the left through the connecting channel, and the end (or tail end) of the extension is the left end of the lower three, that is, the sludge inlet a and the hot air discharge channel 4b are located on the cylinder seat sleeve 21 at the right end of the upper one, and the sludge outlet b and the hot air inlet channel 4a are located on the cylinder seat sleeve 21 at the left end of the lower three. The sludge direction formed is opposite to the airflow direction. At the same time, the number of the hot air inlet channel 4a and the hot air discharge channel 4b is N, where N≥1, and is an integer. In this example, N=2, of course, it can also be more. In short, one or more airflows can contact the sludge more comprehensively, and take away the water in the sludge block more efficiently and with high quality.

[0058] The guide piece s includes an arc-shaped piece group s1 and a dispersion piece group s2, wherein the arc-shaped piece group s1 includes a plurality of arc-shaped segments s10 intermittently distributed along the first spiral track based on the center line of the barrel body 20; the dispersion piece group s2 includes dispersion monomers s20 distributed one by one along the second spiral track based on the center line of the barrel body 20, wherein the first spiral track and the second spiral track are distributed in the same direction and staggered at intervals; the arc-shaped segments s10 and the dispersion monomers s20 cooperate to scatter the sludge blocks to the middle of the barrel body 20 and transport them forward. In this example, the first spiral track is a single spiral line; the second spiral track is a double spiral line, wherein the starting point and the end point of the single spiral line and the double spiral line are arranged in a corresponding direction, that is, the guide piece is distributed in the barrel body with three spiral intervals formed by the single spiral line and the double spiral line, and the spiral forward push is implemented under the premise of satisfying the segmented scattering, so that the sludge stays in the barrel body for a long time and the contact area formed is large, which is more conducive to the implementation of sludge drying in motion. In some specific embodiments, the plurality of arc segments s10 are divided into at least two rows, wherein each row of arc segments s10 is arranged side by side and distributed at equal intervals in the length direction of the barrel body 20. The plurality of rows of arc segments s10 are staggered at equal distances in the circumferential direction of the barrel body 20 with respect to the center line of the barrel body 20. Each dispersed monomer s20 includes a substrate a1 extending along the barrel body diameter 20 and extending from the feed end to the discharge end, a first folding plate b1 located at the end of the substrate a1 away from the barrel body 20 and bent toward the inner wall of the barrel body 20, and a second folding plate c1 located at the side of the substrate a1 close to the feed end and bent toward the discharge end, wherein a mud turning spoon area Q is formed between the substrate a1, the first folding plate b1, and the second folding plate c1; in short, the segmented mud is turned synchronously by using the turning spoon mode, thereby increasing the heat exchange contact area of ​​the mud.

[0059] At the same time, an inflow comber 6 and an inflow guide channel 7 are also provided at the sludge inlet a, wherein the inflow comber 6 can disperse the sludge blocks into the inflow guide channel 7, and the inflow guide channel 7 avoids the segmented guide plate s and accelerates the unloading of the sludge blocks downward and inward. Based on the feed dispersion and accelerated unloading of the sludge blocks, not only the blockage of the incoming mud is reduced, but also the sludge blocks can be scattered, the feed accumulation is reduced, and the heat exchange efficiency is improved. The inflow comber 6 includes a silo 60 with an inlet and an outlet, and a dispersion impeller 61 rotating around the horizontal direction, wherein the dispersion impeller 61 and the inside of the silo 60 cooperate to form a plurality of combing chambers, and the sludge blocks that enter each combing chamber in turn are gradually unloaded through the outlet to the inflow guide channel under the self-rotation of the dispersion impeller. Based on combing, the blockage is reduced, and based on dispersion, the sludge blocks are relatively broken up. At the sludge outlet b, an outflow distributor 8 having the same structure as the inflow comber 6 is provided, and includes an unloading bin 80 having an inlet and an outlet, and an unloading impeller 81 rotating in the horizontal direction, wherein the unloading impeller 81 of the outflow distributor 8 rotates to gradually discharge the sludge blocks entering each distribution chamber from the outlet, thereby avoiding material blockage at the discharge.

[0060] In addition, the frame 1 is also provided with a support roller group 9 for rolling the support roller 2. Under the rigid support provided by the support roller group 9, the stability of rolling rotation is improved. The support roller group 9 includes a plurality of support rollers 90 tangent to each roller 2 and distributed around the circumference of the roller; there are multiple groups of support roller groups 9, which are spaced apart along the length direction of the roller 2. Based on the tangent auxiliary roller rotation, the multiple support roller groups 9 can also provide support and positioning more evenly.

[0061] In summary, the implementation process of this embodiment is as follows:

[0062] The sludge blocks enter the inflow comber 6 from the sludge inlet a, and are combed and dispersed by the inflow comber 6. The sludge blocks are accelerated and unloaded into the upper drum 2 through the inflow guide channel 7. At the same time, based on the circuitous channel formed by the three drums 2, the sludge blocks are gradually transferred to the left end of the next drum 2 in a scattered and flipped manner, and the unloading impeller 81 of the outflow distributor 8 rotates to gradually discharge the sludge blocks entering each load distribution chamber from the outlet;

[0063] As for the hot dry air, it enters from the left end of the next drum 2, then keeps flowing in the opposite direction of the sludge along the circuitous channel to fully contact and take away the moisture in the sludge blocks, and is discharged from the right end of the previous drum 2. At the same time, the discharged gas is separated into solid and gas (that is, enters the solid-gas separator 4d, using a conventional cyclone separator), and the separated gas flows back to the hot air dehumidifier 4c to form a hot dry air circulation.

[0064] Therefore, the circulating hot dry air flows into the sludge channel in the opposite direction of the sludge transmission, taking away the moisture in the sludge blocks to achieve the drying of the sludge blocks. Generally, the moisture content of the sludge blocks entering the dryer is about 75%, and the moisture content of the sludge blocks after drying is about 40% to 50%. According to the calculation of drying one ton of sludge blocks with a moisture content of 80% to a moisture content of 40%, the comprehensive power consumption is only about 60 degrees. Not only is the processing cost low, the energy consumption is low, but there is no pollution, and the waste heat of the hot dry air can be recycled.

[0065] Example 2

[0066] like Figures 7 to 10 As shown, the drum type sludge dryer involved in this embodiment is similar in structure to that of Embodiment 1, except that the drum type sludge dryer in this embodiment is a double-drum type sludge dryer, that is, there are two drums 2.

[0067] Specifically, in this example, the two rollers 2 are also distributed up and down, and also form a circuitous sludge channel. However, in this application, the sludge inlet a and the hot air discharge channel 4b are located at the left end of the upper roller; the sludge outlet b and the hot air inlet channel 4a are located at the left end of the lower roller. At the same time, the inner diameters of the two rollers 2 in this example are equal, and the length of each roller 2 is significantly greater than the length of the roller in Example 1. As for the implementation process, it is also the same as Example 1, except that there is one less circuitous, but the roller 2 is lengthened.

[0068] Example 3

[0069] The drum-type sludge dryer involved in this embodiment has the same structure as that of Embodiment 1 or Embodiment 2, except that there is no hot dry air circulation in this embodiment, that is, the exhaust gas can also be collected and processed centrally, or, when it meets the emission standards, can be directly discharged.

[0070] In summary, when the drum-type sludge dryer is used, the sludge blocks enter the sludge channel from the sludge inlet and are transmitted in a circuitous manner along the sludge channel from top to bottom. At the same time, the sludge blocks are scattered to the middle by the segmented guide vanes, and then hot dry air is introduced into the sludge channel, and the hot dry air contacts the scattered sludge blocks and absorbs moisture in the sludge blocks, and the airflow direction is opposite to the circuitous transmission direction of the sludge blocks, and finally discharged from the sludge channel, and the discharged gas flows back to the hot air dehumidifier again, and the sludge blocks are dried in the hot dry air circulation, and the dried sludge blocks are discharged from the sludge outlet. Therefore, on the one hand, the present invention is based on the hot dry air and the sludge maintaining reverse contact. The hot dry air absorbs the moisture in the sludge block, and the sludge block is transmitted based on the detour and scattering of the drum. In addition, the hot dry air contacts the inner wall of the drum and the guide, which greatly increases the effective contact area between the sludge block and the hot air dryer. The dispersed transmission formed by the segmented guide vane effectively prolongs the residence time of the sludge block in the drum, so as to efficiently complete the drying of the sludge block. On the other hand, the hot dry air can circulate into the sludge channel, which not only recovers the heat of the gas discharged from the sludge channel, but also reduces the energy consumption of the hot air dehumidifier, and greatly reduces the cost of drying the sludge block (calculated based on the treatment of one ton of sludge block with a moisture content of 80% to a moisture content of 40%, Its comprehensive power consumption is only about 60 degrees). In addition, the air-drying section of the equipment adopts the principle of heat pump dehumidification, uses multiple cylinders as drying carriers, and uses a closed space design and circulating transportation, which greatly improves the effective utilization rate of hot air. The sludge blocks in the cylinder can be scattered evenly at high speed, and the contact area and contact rate between the sludge and the hot dry air can be greatly increased, thereby achieving deep air drying and dehydration. At the same time, the entire drying system is a fully enclosed structure, and the sludge odor is not easy to leak out. The implementation of the sludge odor solution is simple and the working environment is clean and tidy. The third aspect of the air-drying section adopts the principle of heat pump dehumidification. The heat pump dehumidification itself has the energy-saving characteristics of all drying equipment, and the cylindrical air dryer is different from the traditional heat pump dehumidifier in its operation mode. The recycled hot air makes the energy utilization rate higher; it runs smoothly and has low noise. The operating speed of the core parts of the equipment is only 5-10r / min, and it runs smoothly with noise within 65 decibels; fourthly, the equipment has a simple structure, few wearing parts, and low maintenance cost; in addition, it can be fully automatically controlled, from sludge dehydration to sludge drying, the entire processing link adopts fully automatic touch screen control, and the key operation links are monitored by cameras. It is easy to operate, requires fewer operators, and has high work efficiency.

[0071] The above detailed description of the present invention is intended to enable persons familiar with the art to understand the contents of the present invention and implement them. It does not limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A drum type sludge drying machine, comprising a frame, a drum with a horizontal axis, and a power device for driving the drum to rotate, characterized in that: There are at least two rollers, and the rollers are arranged up and down and connected to form a circuitous sludge channel, wherein the head end and the tail end of the sludge channel respectively form a sludge inlet and a sludge outlet, and each upper and lower adjacent two rollers rotate towards each other, and the inner wall of each roller is provided with a segmented guide plate capable of throwing the sludge blocks to the middle, and the sludge blocks formed by each upper and lower adjacent two rollers are transmitted in opposite directions; the power device drives any one or more of the multiple rollers to rotate synchronously; The sludge drying machine also includes a hot air drying unit, which includes a hot air inlet channel and a hot air outlet channel connected to the sludge channel, and a hot air dehumidifier, wherein the hot air inlet channel is located at the lowermost end of the drum, and the hot air inlet channel is located at the uppermost end of the drum. The hot air formed by the hot air dehumidifier enters the hot air inlet channel and contacts the sludge and is discharged from the hot air outlet channel in the opposite direction to the sludge block transmission direction, and the discharged gas flows back to the hot air dehumidifier to form a hot dry air circulation.

2. The drum type sludge drying machine according to claim 1, characterized in that: Each of the rollers comprises a roller body with the segmented guide vanes formed inside, and a roller seat sleeve formed at both ends of the roller body, wherein the roller seat sleeve is fixed on the frame, and the roller body is rotatably arranged relative to the roller seat sleeve.

3. The drum type sludge drying machine according to claim 2, characterized in that: Each of the cylinder seats is aligned from the end of the frame in the up-down direction; each of the cylinder bodies is aligned up-down and arranged at equal intervals.

4. The drum type sludge drying machine according to claim 3, characterized in that: The sludge inlet and the sludge outlet are respectively located on the corresponding cartridge seat sleeves at the top and bottom; The hot air inlet channel and the hot air exhaust channel are respectively located on the corresponding cylinder seat sleeves at the bottom and the top; wherein the sludge inlet and the hot air exhaust channel are located on the same cylinder seat sleeve; the sludge outlet and the hot air inlet channel are located on the same cylinder seat sleeve; and / or, the number of the hot air inlet channel and the hot air exhaust channel is N, where N≥1 and is an integer.

5. The drum type sludge drying machine according to claim 1, characterized in that: An inflow comber and an inflow guide channel are also provided at the sludge inlet, wherein the inflow comber can disperse the sludge blocks into the inflow guide channel, and the inflow guide channel avoids the segmented guide plate and accelerates the unloading of the sludge blocks downward and inward.

6. The drum type sludge drying machine according to claim 5, characterized in that: The inflow comber includes a silo with an inlet and an outlet, and a dispersion impeller rotating in a horizontal direction, wherein the dispersion impeller and the interior of the silo cooperate to form a plurality of combing chambers, and under the self-rotation of the dispersion impeller, the sludge blocks entering each combing chamber in sequence are gradually unloaded through the outlet to the inflow guide channel.

7. The drum type sludge drying machine according to claim 6, characterized in that: An outflow distributor having the same structure as the inflow comber is provided corresponding to the sludge outlet, wherein the sludge blocks entering each distribution chamber are gradually discharged from the outlet by the self-rotation of the dispersing impeller of the outflow distributor.

8. The drum type sludge drying machine according to claim 1, characterized in that: The frame is also provided with a supporting roller group for rolling and supporting the roller.

9. The drum type sludge drying machine according to claim 8, characterized in that: The supporting roller group includes a plurality of supporting rollers tangent to each roller and distributed around the circumference of the roller; and / or, the supporting roller group includes a plurality of groups and is distributed at intervals along the length direction of the roller.

10. The drum type sludge drying machine according to claim 1, characterized in that: A gear plate is provided on the circumference of each roller, and each two adjacent rollers above and below are meshed and rotate synchronously through the gear plate.

11. The drum type sludge drying machine according to claim 10, characterized in that: The power device comprises a power gear installed on the frame and meshing with the gear plate, and a power motor driving the power gear to rotate.

12. The drum type sludge drying machine according to claim 1, characterized in that: The hot air drying unit further comprises a solid-gas separator, wherein after solid-gas separation of the gas discharged from the hot air discharge channel, the separated gas flows back to the hot air dehumidifier to form a hot dry air cycle.

13. The drum type sludge drying machine according to claims 1 to 12, characterized in that: There are two drums, and the sludge inlet, sludge outlet, hot air inlet channel, and hot air exhaust channel are located on the same side of the frame, wherein the sludge inlet and the hot air exhaust channel are connected to the upper drum; the sludge outlet and the hot air inlet channel are connected to the lower drum.

14. The drum type sludge drying machine according to claims 1 to 12, characterized in that: There are three drums, the sludge inlet and the hot air exhaust channel are connected to the drum at the top, the sludge outlet and the hot air inlet channel are connected to the drum at the bottom, and the sludge inlet and the sludge outlet, and the hot air inlet channel and the hot air exhaust channel are respectively located at the upper and lower parts of the opposite sides of the frame.

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