Circulating hot air drying type sludge drying process

Abstract

The invention relates to a circulating hot air drying type sludge drying process. The process comprises the following steps: S1, setting a path of sludge blocks; s2, setting a path of hot dry air; and S3, drying the sludge blocks. 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 technical field of sludge treatment, and in particular relates to a circulating hot air drying type sludge drying process. 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 sludge blocks is about 75%, and the water content of sludge blocks after drying is about 40%). This process aims to reduce the volume and weight of 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: 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; 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

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a new circulating hot air drying type sludge drying process.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A circulating hot air drying sludge drying process, the sludge drying machine used in the process comprises a frame, a drum with a horizontal axis, and a power device for driving the drum to rotate. There are at least two drums, and the multiple drums are arranged up and down and connected to form a circuitous sludge channel. The power device drives any one or more of the multiple drums to rotate synchronously, and each two adjacent drums rotate towards each other; the inner wall of each drum is provided with a segmented guide plate capable of throwing sludge blocks to the middle, the sludge drying machine also includes a hot dry air circulation unit, and includes the following steps: S1. Path setting of sludge block Based on the horizontal spacing layout of the multiple rollers, the circuitous sludge channel is formed to circuit along the left and right direction, and the head end of the upper part of the sludge channel is the sludge block feeding end, and the tail end of the lower part of the sludge channel is the sludge block discharging end, that is, the sludge block is moved from top to bottom along the circuitous sludge channel, and is gradually pushed toward the tail end during the turning and scattering of the segmented guide vanes that operate synchronously with the rollers; S2. Hot dry air path setting The hot dry air enters from the lower drum, passes through each of the drums in sequence from bottom to top along the circuitous sludge channel, and is discharged from the upper drum, and the transmission paths of the hot dry air and the sludge block are kept opposite, and the discharged gas enters the lower drum again based on the treatment of the hot dry air circulation unit to form a cycle; S3. Drying of sludge cake The sludge blocks enter from the head end according to the set path, and hot dry air is also provided according to the hot dry air path. The sludge blocks are flipped and scattered based on the segmented guide vanes, and the hot dry air contacts them and keeps the transmission direction of the sludge blocks opposite to the flow direction of the hot dry air to take away the moisture in the sludge blocks. The sludge blocks are discharged from the tail end along the circuitous sludge channel, and the moisture-containing gas flows back to the hot dry air circulation unit.

[0007] Preferably, in step S1, the sludge block feeding end and the sludge discharging end are respectively provided with a sludge inlet hopper and a sludge outlet hopper, wherein the sludge block is added and unloaded from the sludge inlet hopper and dispersed to the drum, and the sludge inlet hopper can prevent the leakage of gas; the dried sludge block is discharged from the corresponding drum from the sludge outlet hopper, and the sludge outlet hopper can prevent the leakage of hot dry air. The cooperation between the hopper and the impeller not only reduces the probability of inlet and outlet blockage, but also avoids the leakage of hot dry air or reflux gas caused by the inlet and outlet.

[0008] According to a specific implementation and preferred aspect of the present invention, the mud feed hopper includes a hopper body with an inlet and an outlet formed at the upper and lower ends, a dispersion impeller located inside the hopper body, and a feed guide channel connected to the outlet and extending inside the drum, wherein the sludge blocks are dispersed and transmitted to the outlet based on the rotation of the dispersion impeller, and the outlet is connected to the corresponding dispersion impeller cavity, and the sludge blocks are accelerated to be unloaded and dispersed in the middle of the drum after entering the feed guide channel downward. At this time, the sludge blocks are further broken up based on the dispersion impeller, and the feed of the sludge blocks in and out can be continuously maintained based on the alignment during rotation, and most importantly, the inlet and outlet are not connected to avoid gas leakage. In addition, the feed guide channel can transmit the sludge blocks to the middle of the roll where the guide plate is located.

[0009] Preferably, the feed guide channel includes a direct discharge pipeline extending up and down, and a dispersion pipeline extending obliquely from the lower end of the direct discharge pipeline into the drum, wherein the dispersion pipeline can accelerate and disperse the auxiliary discharge based on the inclined surface guidance. That is, based on the setting of the dispersion pipeline, the transmission direction of the sludge block is changed, and a parabolic scattering can be formed by sequential transmission.

[0010] According to another specific implementation and preferred aspect of the present invention, the sludge discharge hopper includes a hopper body with an inlet and an outlet formed at the upper and lower ends, and an unloading impeller located inside the hopper body, wherein the rotation of the unloading impeller unloads the sludge blocks into the rotating unloading chamber, and then each unloading chamber is sequentially connected to the outlet to discharge the dried sludge. Similarly, based on the rotation of the unloading impeller, continuous unloading is achieved, and the inlet and outlet of the unloading are relatively separated to prevent the leakage of hot dry air.

[0011] Preferably, in step S2, there are multiple hot dry air streams entering from the lower drum, and the multiple hot dry air streams cover the entire sludge channel based on the center line of the sludge channel. The increase in airflow power formed by the fluidity of the multiple streams is more conducive to the smooth flow of the airflow.

[0012] According to another specific implementation and preferred aspect of the present invention, in step S2, the hot dry air circulation unit used includes a hot dry air inlet pipeline, a gas exhaust pipeline, a hot air dehumidifier and a gas separator, wherein the hot air dehumidifier sends the hot dry air from the hot dry air inlet pipeline into the drum, and the gas that absorbs moisture is discharged from the gas exhaust pipeline and enters the gas separator for solid-gas separation, and the separated gas enters the hot air dehumidifier for dehumidification and heating treatment to form hot dry air to circulate and supply to the hot dry air inlet pipeline. Here, the particles in the gas are first removed by the gas separator to prevent the particles from entering the hot air dehumidifier; at the same time, the formed gas refluxes to implement waste heat recovery, reducing the energy consumption required by the hot air dehumidifier.

[0013] Furthermore, in step S2, the air inlet of the hot air dehumidifier is also connected to the external space, that is, the external airflow and the separated gas are mixed and enter the hot air dehumidifier, wherein the mixing amount of the external airflow is adjusted based on the ambient temperature setting.

[0014] According to another specific implementation and preferred aspect of the present invention, in step S3, before the sludge blocks enter, hot dry air is first introduced into the lower drum, and the inner wall and the guide vane are preheated based on the rotation of each drum and discharged from the top drum, and the discharged gas enters the lower drum after circulated treatment, and then the sludge blocks are added from the head end of the sludge channel. In short, each drum is preheated by hot dry air before treatment, and the sludge blocks are added to the drum after the circulating supply atmosphere is formed, so that the contact area formed is optimal and it is more conducive to the dehydration of the sludge blocks.

[0015] In addition, the guide vane includes an arc-shaped blade group and a dispersion blade group, wherein the arc-shaped blade group includes a plurality of arc-shaped segments which are intermittently distributed along the first spiral track based on the center line of the barrel body; the dispersion blade group includes dispersion monomers which are distributed one by one along the second spiral track based on the center line of the barrel body, wherein the first spiral track and the second spiral track are distributed in the same direction and at staggered intervals; the arc-shaped segments and the dispersion monomers cooperate to scatter the sludge toward the middle of the barrel body and gradually transmit it to the discharge end. Based on the intermittent and spiral track layout of the guide vane, not only the time for the material to exchange heat in the barrel body is extended, but also the sludge can be scattered to increase the heat exchange contact area. At the same time, the spiral guide vane layout formed can transmit the product to the discharge end to meet the needs of the drum to implement sludge drying during movement. In addition, the structure is simple, the implementation is convenient, and the length and space occupied are small, which increases the practicality of the drum.

[0016] Due to the implementation of the above technical solution, the present invention has the following advantages compared with the prior art: In the existing sludge block drying, during the evaporation process, the spiral guide vanes inside the drum are continuously arranged, which results in a short residence time of the sludge blocks in the drum. Therefore, in order to achieve the desired drying effect, the drum can only be lengthened, which not only increases the occupied space of 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. In addition, the evaporated hot air cannot be directly discharged, and not only contains harmful gases and soil particles, Moreover, the heat energy generated also 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 and other shortcomings. The present application cleverly solves the various shortcomings of the existing structure through the overall design of the circulating hot air drying sludge drying machine and process. After adopting the circulating hot air drying sludge drying process, firstly, based on the upper and lower horizontal spacing layout of multiple drums, the circuitous sludge channel formed is circuitous along the left and right directions, and the head end of the upper part of the sludge channel is the sludge block feeding end, and the tail end of the lower part of the sludge channel is the sludge block discharging end, that is, the sludge block is from top to bottom along The hot dry air enters the lower drum, passes through each of the drums from bottom to top along the circuitous sludge channel, and is gradually pushed toward the tail end during the turning and scattering of the segmented guide vanes that operate synchronously with the drum; secondly, the hot dry air enters from the lower drum, passes through each of the drums in sequence from bottom to top along the circuitous sludge channel, and is discharged from the upper drum, and the transmission paths of the hot dry air and the sludge blocks are kept opposite, and the exhausted gas enters the lower drum again based on the processing of the hot dry air circulation unit to form a cycle; finally, the sludge blocks enter from the head end according to the set path, and hot dry air is also provided according to the hot dry air path, and the sludge blocks are contacted and maintained by the hot dry air based on the turning and scattering of the segmented guide vanes. The conveying direction of the soil block is opposite to the flow direction of the hot dry air, and the moisture in the sludge block is taken away. The sludge block is discharged from the tail end along the circuitous sludge channel, and the gas containing moisture flows back to the hot dry air circulation unit. Therefore, on the one hand, the hot dry air and the sludge are in reverse contact, and the hot dry air absorbs the moisture in the sludge block. At the same time, the sludge block is conveyed 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 block and the hot air drying. In addition, 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, reduces the energy consumption of the hot air dehumidifier, and greatly reduces the cost of drying 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%, the 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 can be evenly scattered in the cylinder at high speed due to the scattering and segmented guide vanes in the cylindrical structure, which greatly increases 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

[0017] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 It is a half-section schematic diagram of the three-drum sludge drying machine of Example 1; Figure 2 for Figure 1 AA section view; Figure 3 It is a structural schematic diagram of the drum in Example 1; Figure 4 for Figure 3 A half-section diagram of Figure 5 for Figure 3 An enlarged schematic diagram of the cross section at the middle gear plate; Figure 6 This is a schematic diagram of the working principle of Example 1; Figure 7 It is a half-section schematic diagram of the double-drum sludge drying machine of Example 2; Figure 8 for Figure 7 Schematic diagram of the left side; Fig. 9 for Figure 7 BB-direction cross-sectional view; Fig.10 This is a schematic diagram of the working principle of Example 2; Among them: 1. Rack; 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; Ⅰ, short diameter group; Ⅱ, long diameter group; 3. Power device; 30. Power gear; 31. Power motor; 4. Hot air drying unit; 4a. Hot air inlet channel; 4b. Hot air outlet channel; 4c. Hot air dehumidifier; 4d. Solid-gas separator; 5. Gear plate; 6. Mud inlet hopper; 60. Hopper body; 61. Dispersing impeller; 62. Inlet guide channel; 620. Direct unloading pipeline; 621. Dispersing pipeline; 8. Mud outlet hopper; 80. Hopper body; 81. Unloading impeller; 9. Support roller assembly; 90. Support roller. DETAILED DESCRIPTION

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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. Example 1

[0024] 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 (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 cycle. At the same time, it also prevents sludge particles from entering the hot air dehumidifier and causing machine wear.

[0025] 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 sludge is dried with hot air in a relatively sealed space to remove moisture in the sludge, so as to achieve the required drying effect.

[0026] 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.

[0027] 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 hot air inlet channels 4a and hot air discharge channels 4b is N, where N≥1, and is an integer. In this example, N=2, and of course it can be more. In short, one or more airflows can contact the sludge more comprehensively, and take away the moisture in the sludge blocks more efficiently and with higher quality.

[0028] 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. In this example, the mud turning spoon area Q is formed in multiple rows in the circumferential direction of the barrel body 20, and the radial extension length of the substrate a1 of each row of the mud turning spoon area Q is different, and it is divided into a short diameter group I and a long diameter group II, wherein the short diameter group I and the long diameter group II are relatively staggered and spaced, and the short diameter group I has two rows of mud turning spoon areas, and the long diameter group II also has two rows of mud turning spoon areas, while maintaining the long and short interval distribution. (The mud turning spoon area Q is formed in multiple rows in the circumferential direction of the barrel body 20, wherein the radial extension length of the substrate a1 of each row of the mud turning spoon area Q is equal.) At the same time, the sludge block feeding end and the sludge discharging end are respectively provided with a sludge inlet hopper 6 and a sludge outlet hopper 8, wherein the sludge block is added and unloaded from the sludge inlet hopper 6 and dispersed to the drum 2, and the sludge inlet hopper 6 can prevent the leakage of gas; the dried sludge block is discharged from the corresponding drum 2 from the sludge outlet hopper 8, and the sludge outlet hopper 8 can prevent the leakage of hot dry air. The cooperation between the hopper and the impeller not only reduces the probability of material blockage at the inlet and outlet, but also avoids the leakage of hot dry air or reflux gas caused by the inlet and outlet.

[0029] In this example, the mud feed hopper 6 includes a hopper body 60 with an inlet and an outlet formed at the upper and lower ends, a dispersion impeller 61 located inside the hopper body 60, and a feed guide channel 62 connected to the outlet and extending inside the drum 2, wherein the sludge blocks are dispersed and transmitted to the outlet based on the rotation of the dispersion impeller 61, and the outlet is connected to the corresponding dispersion impeller cavity, and the sludge blocks enter the feed guide channel downward and accelerate unloading and disperse in the middle of the drum. At this time, the sludge blocks are further broken up based on the dispersion impeller, and the feed of the sludge blocks in and out can be continuously maintained based on the alignment during rotation, and most importantly, the inlet and the outlet are not connected to avoid gas leakage. In addition, the feed guide channel 62 can transfer the sludge blocks to the middle of the roll where the guide plate is located. The feed guide channel 62 includes a direct discharge pipeline 620 extending up and down, and a dispersion pipeline 621 extending obliquely from the lower end of the direct discharge pipeline 620 to the inside of the drum, wherein the dispersion pipeline 621 can accelerate and assist in dispersing the discharge based on the inclined surface guidance. That is, based on the setting of the dispersion pipeline, the transmission direction of the sludge block is changed, and it can be transmitted in sequence to form a parabolic scattering. The sludge discharge hopper 8 includes a hopper body 80 with an inlet and an outlet formed at the upper and lower ends, and an unloading impeller 81 located inside the hopper body 80, wherein the rotation of the unloading impeller 81 unloads the sludge block into the rotating unloading cavity, and then each unloading cavity is connected to the outlet in turn to discharge the dried sludge. Similarly, based on the rotation of the unloading impeller, continuous unloading is achieved, and the inlet and outlet of the unloading are relatively separated to avoid the leakage of hot dry air.

[0030] 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.

[0031] In summary, the implementation process of this embodiment is as follows: S1. Path setting of sludge block Based on the horizontal spacing layout of the multiple rollers, the circuitous sludge channel is formed to circuit along the left and right direction, and the head end of the upper part of the sludge channel is the sludge block feeding end, and the tail end of the lower part of the sludge channel is the sludge block discharging end, that is, the sludge block is moved from top to bottom along the circuitous sludge channel, and is gradually pushed toward the tail end during the turning and scattering of the segmented guide vanes that operate synchronously with the rollers; S2. Hot dry air path setting The hot dry air enters from the lower drum, passes through each of the drums in sequence from bottom to top along the circuitous sludge channel, and is discharged from the upper drum, and the transmission paths of the hot dry air and the sludge block are kept opposite, and the discharged gas enters the lower drum again based on the treatment of the hot dry air circulation unit to form a cycle; S3. Drying of sludge cake The sludge blocks enter from the head end according to the set path, and hot dry air is also provided according to the hot dry air path. The sludge blocks are flipped and scattered based on the segmented guide vanes, and the hot dry air contacts them and keeps the transmission direction of the sludge blocks opposite to the flow direction of the hot dry air to take away the moisture in the sludge blocks. The sludge blocks are discharged from the tail end along the circuitous sludge channel, and the moisture-containing gas flows back to the hot dry air circulation unit.

[0032] In step S2, there are multiple strands of hot dry air entering from the lower drum, and the multiple strands of hot dry air cover the entire sludge channel based on the center line of the sludge channel. The increase in airflow power formed by the fluidity of the multiple strands is more conducive to the smooth flow of airflow. In step S2, the hot dry air circulation unit used includes a hot dry air inlet pipeline, a gas exhaust pipeline, a hot air dehumidifier and a gas separator, wherein the hot air dehumidifier sends the hot dry air from the hot dry air inlet pipeline into the drum, and the gas that absorbs moisture is discharged from the gas exhaust pipeline and enters the gas separator for solid-gas separation, and the separated gas enters the hot air dehumidifier for dehumidification and heating treatment to form hot dry air to circulate and supply to the hot dry air inlet pipeline. Here, the particles in the gas are first removed by the gas separator to prevent the particles from entering the hot air dehumidifier; at the same time, the formed gas refluxes to implement waste heat recovery, reducing the energy consumption required for the hot air dehumidifier. In step S2, the air inlet of the hot air dehumidifier is also connected to the external space, that is, the external airflow and the separated gas are mixed and enter the hot air dehumidifier, wherein the mixing amount of the external airflow is adjusted based on the ambient temperature setting.

[0033] In step S3, before the sludge blocks enter, hot dry air is first introduced into the lower drum, and the inner wall and guide vane are preheated based on the rotation of each drum and discharged from the top drum. At the same time, the discharged gas enters the lower drum after circulated treatment, and then the sludge blocks are added from the head end of the sludge channel. In short, each drum is preheated by hot dry air before treatment, and the sludge blocks are added to the drum after the circulating supply atmosphere is formed, so that the contact area formed is optimal and it is more conducive to the dehydration of the sludge blocks.

[0034] Therefore, the circulating hot dry air flows into the sludge channel in the opposite direction of the sludge transmission to take away the moisture in the sludge block to achieve the drying of the sludge block. Generally, the moisture content of the sludge block entering the dryer is about 75%, and the moisture content of the sludge block after drying is about 40%~50%. Calculated based on the treatment of one ton of sludge block with a moisture content of 80% to a moisture content of 40%, the comprehensive power consumption is only about 60 degrees, which not only has low processing cost and energy consumption, but also is pollution-free, and the waste heat of the hot dry air can be recycled. Example 2

[0035] like Figures 7 to 9 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.

[0036] 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, combined with Fig.10 As shown, it is also the same as embodiment 1, except that there is one less detour, but the drum 2 is lengthened.

[0037] 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 blocks, and at the same time, the sludge blocks are transmitted based on the circuitous and scattered transmission of the drum, and then In addition, the contact between the hot dry air and the inner wall of the drum and the guide greatly increases the effective contact area between the sludge block and the hot air dryer, and the dispersed transmission formed by the segmented guide plate 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, 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%, the 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 has a closed space design and circulating transportation, which greatly improves the effective utilization of hot air. The sludge clods can be scattered evenly in the cylinder at high speed due to the scattering and segmented guide vanes in the cylindrical structure, which greatly increases the contact area 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, 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 is that the air drying section adopts the principle of heat pump dehumidification. The heat pump dehumidification itself has the characteristics of energy saving among all drying equipment, and the cylindrical air dryer is different from the traditional heat pump dehumidifier in operation. 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, which is stable and noisy. 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 link is monitored by a camera, which is easy to operate, requires fewer operators and has high work efficiency; fifthly, based on the intermittent and spiral trajectory layout of the guide vane, it not only prolongs the time for the material to exchange heat in the drum body, but also can scatter the sludge to increase the heat exchange contact area. At the same time, the spiral guide vane layout formed can transmit the product to the discharge end to meet the needs of the drum to implement sludge drying during movement. In addition, the structure is simple, the implementation is convenient, and the length and space occupied are small, which increases the practicality of the drum;The sixth aspect adopts a multi-spiral layout, which can push the sludge from the discharge end regardless of the scattering effect. At the same time, the guide plate is distributed in the barrel body with three spiral intervals between the single spiral line and the double spiral line. Under the premise of satisfying the segmented scattering, the spiral forward push is implemented, 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 sludge drying during movement; the seventh aspect is that multiple dispersed monomers are distributed along the double helix line in a staggered manner in the circumferential direction of the barrel body, so that the scattering effect is good, and the multiple dispersed monomers are aligned in the length direction of the barrel body and divided into multiple rows, and the multiple rows of dispersed monomers are distributed at intervals in the circumferential direction of the barrel body; the fifth aspect adopts a flip spoon The mode turns over the segmented soil synchronously, thereby increasing the heat exchange contact area of ​​the soil, and the mud turning spoon area is formed in multiple rows in the circumferential direction of the cylinder body, and the radial extension length of the substrate of each row of mud turning spoon areas is different, and it is divided into a short diameter group and a long diameter group, wherein the short diameter group and the long diameter group are relatively staggered and distributed at intervals, and the short diameter group has two rows of mud turning spoon areas, and the long diameter group also has two rows of mud turning spoon areas, while maintaining the long and short interval distribution; multiple arc segments are divided into at least two rows, wherein each row of arc segments is kept side by side and distributed at equal intervals in the length direction of the cylinder body, and multiple rows of arc segments are staggered at equal distances in the circumferential direction of the cylinder body with the center line of the cylinder body, so that the segmented effect formed is conducive to the mud turning spoon area to implement the scattering of soil. ;

[0038] 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 circulating hot air drying sludge drying process, wherein the sludge drying machine used comprises 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 drums, and the drums are arranged up and down and connected to form a circuitous sludge channel. The power device drives any one or more of the drums to rotate synchronously, and each two adjacent drums rotate towards each other; the inner wall of each drum is provided with a segmented guide plate capable of throwing the sludge blocks to the middle, and the sludge dryer also includes a hot dry air circulation unit, and includes the following steps: S1. Path setting of sludge block Based on the horizontal spacing layout of the multiple rollers, the circuitous sludge channel is formed to circuit along the left and right direction, and the head end of the upper part of the sludge channel is the sludge block feeding end, and the tail end of the lower part of the sludge channel is the sludge block discharging end, that is, the sludge block is moved from top to bottom along the circuitous sludge channel, and is gradually pushed toward the tail end during the turning and scattering of the segmented guide vanes that operate synchronously with the rollers; S2. Hot dry air path setting The hot dry air enters from the lower drum, passes through each of the drums in sequence from bottom to top along the circuitous sludge channel, and is discharged from the upper drum, and the transmission paths of the hot dry air and the sludge block are kept opposite, and the discharged gas enters the lower drum again based on the treatment of the hot dry air circulation unit to form a cycle; S3. Drying of sludge cake The sludge blocks enter from the head end according to the set path, and hot dry air is also provided according to the hot dry air path. The sludge blocks are flipped and scattered based on the segmented guide vanes, and the hot dry air contacts them and keeps the transmission direction of the sludge blocks opposite to the flow direction of the hot dry air to take away the moisture in the sludge blocks. The sludge blocks are discharged from the tail end along the circuitous sludge channel, and the moisture-containing gas flows back to the hot dry air circulation unit.

2. The circulating hot air drying sludge drying process according to claim 1 is characterized in that: In step S1, the sludge block feeding end and the sludge discharging end are respectively provided with a sludge inlet hopper and a sludge outlet hopper, wherein the sludge block is added into and unloaded from the sludge inlet hopper and dispersed into the drum, and the sludge inlet hopper can prevent the leakage of gas; the dried sludge block is discharged from the corresponding drum from the sludge outlet hopper, and the sludge outlet hopper can prevent the leakage of hot dry air.

3. The circulating hot air drying sludge drying process according to claim 2 is characterized in that: The mud feeding hopper includes a hopper body with an inlet and an outlet formed at the upper and lower ends, a dispersion impeller located inside the hopper body, and a feeding guide channel connected to the outlet and extending to the inside of the drum, wherein the sludge blocks are dispersed and transmitted to the outlet based on the rotation of the dispersion impeller, and the outlet is connected to the corresponding dispersion impeller cavity. After the sludge blocks enter the feeding guide channel downward, they are accelerated to be unloaded and dispersed in the middle of the drum.

4. The circulating hot air drying sludge drying process according to claim 3 is characterized in that: The feed guide channel includes a direct discharge pipeline extending up and down, and a dispersion pipeline extending obliquely from the lower end of the direct discharge pipeline into the drum, wherein the dispersion pipeline can accelerate and disperse the auxiliary discharge based on the inclined surface guidance.

5. The circulating hot air drying sludge drying process according to claim 2 is characterized in that: The mud discharge hopper includes a hopper body with an inlet and an outlet formed at the upper and lower ends, and an unloading impeller located inside the hopper body, wherein the rotation of the unloading impeller unloads the sludge blocks into the rotating unloading cavity, and then each unloading cavity is connected with the outlet in turn to discharge the dried sludge.

6. The circulating hot air drying sludge drying process according to claim 1, characterized in that: In step S2, multiple streams of hot dry air enter from the lower drum, and the multiple streams of hot dry air cover the entire sludge channel based on the center line of the sludge channel.

7. The circulating hot air drying sludge drying process according to claim 1, characterized in that: In step S2, the hot dry air circulation unit used includes a hot dry air inlet pipeline, a gas exhaust pipeline, a hot air dehumidifier and a gas separator, wherein the hot air dehumidifier delivers the hot dry air from the hot dry air inlet pipeline into the drum, and the gas that absorbs moisture is discharged from the gas exhaust pipeline and enters the gas separator for solid-gas separation, and the separated gas enters the hot air dehumidifier for dehumidification and heating treatment to form hot dry air that is circulated and supplied to the hot dry air inlet pipeline.

8. The circulating hot air drying sludge drying process according to claim 7, characterized in that: In step S2, the air inlet of the hot air dehumidifier is also connected to the external space, that is, the external airflow and the separated gas are mixed and enter the hot air dehumidifier, wherein the mixing amount of the external airflow is adjusted based on the ambient temperature.

9. The circulating hot air drying sludge drying process according to claim 1, characterized in that: In step S3, before the sludge blocks enter, hot dry air is first introduced into the lower drum, and the inner wall and guide vane are preheated based on the rotation of each drum and discharged from the top drum. At the same time, the discharged gas enters the lower drum after circulation treatment, and then the sludge blocks are added from the head end of the sludge channel.

10. The circulating hot air drying sludge drying process according to claim 1, characterized in that: The guide plate includes an arc-shaped plate group and a dispersion plate group, wherein the arc-shaped plate group includes a plurality of arc-shaped segments which are intermittently distributed along a first spiral track based on the center line of the barrel body; the dispersion plate group includes dispersion monomers which are distributed one by one along a second spiral track based on the center line of the barrel body, wherein the first spiral track and the second spiral track are distributed in the same direction and at staggered intervals; the arc-shaped segments and the dispersion monomers cooperate to scatter the sludge toward the middle of the barrel body and gradually transmit it to the discharge end.

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