Drying incineration system for wet sludge
By opening air holes on the conveyor belt of the wet sludge drying system and using hot air circulation pipelines, the problem of small contact area between hot air and wet sludge in the prior art is solved, and more efficient wet sludge drying is achieved.
Patent Information
- Application Number
- CN202411892586.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-14
AI Technical Summary
In the existing wet sludge drying technology, the contact area between hot air and wet sludge is small, resulting in poor drying effect.
A dry incineration system for wet sludge was designed. By opening multiple air holes on the conveyor belt, and using hot air circulation pipelines and circulation fans, the contact area between hot air and wet sludge is increased.
It significantly improves the drying effect of wet sludge, enhances the contact area between hot air and wet sludge, and thus improves the drying efficiency.
Smart Images
Figure CN119617430A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of sludge disposal, and in particular to a wet sludge drying and incineration system. Background Art
[0002] Since wet sludge contains pathogens, parasite eggs, heavy metals and a variety of refractory organic compounds, which will harm human health and the growth of plants and animals, it is necessary to centrally treat wet sludge. Due to its high water content and low calorific value, wet sludge often requires drying pretreatment to reduce the moisture content and volume of wet sludge, kill pathogens, and then carry out subsequent treatment such as landfill, incineration, composting, and land use.
[0003] In the prior art, the drying of wet sludge is mostly carried out by contact heat transfer drying, that is, the conveyor belt conveying the wet sludge or the support plate supporting the wet sludge is heated, resulting in a smaller heating area of the wet sludge and a poor drying effect. Summary of the invention
[0004] The purpose of the present invention is to provide a wet sludge drying and incineration system, which can increase the contact area between hot air and wet sludge and improve the drying effect on wet sludge.
[0005] To achieve this object, the present invention adopts the following technical solutions:
[0006] A wet sludge drying and incineration system, comprising:
[0007] A drying device, comprising a drying bin and a transmission mechanism, wherein the drying bin is provided with an air inlet, a first air outlet, a feed inlet and a discharge outlet, and the transmission mechanism comprises a transmission belt, wherein the transmission belt is provided with a plurality of air holes, and the transmission belt is configured to transmit the wet sludge entering from the feed inlet to the discharge outlet;
[0008] A hot air circulation pipeline, wherein two ends of the hot air circulation pipeline are respectively connected to the air inlet and the first air outlet;
[0009] A circulation fan is arranged on the hot air circulation pipeline, and the circulation fan is configured to drive the gas flow in the hot air circulation pipeline.
[0010] As an optional solution for the above-mentioned wet sludge drying and incineration system, the drying device also includes a briquetting mechanism, which is arranged at the feed port, and includes two briquetting disks that rotate synchronously and counter-rotatingly, and the outer periphery of the briquetting disks is provided with a briquetting groove, and the outer peripheral surfaces of the two briquetting disks abut to make the two briquetting grooves form a briquetting channel, and the wet sludge can form sludge blocks through the briquetting channel.
[0011] As an optional solution of the above-mentioned wet sludge drying and incineration system, the agglomeration disk is provided with a plurality of cutting protrusions at intervals along the circumferential direction, and the cutting protrusions of the two agglomeration disks correspond one to one to cut the wet sludge to form the sludge blocks.
[0012] As an optional solution of the above-mentioned wet sludge drying and incineration system, the size of the air hole is smaller than the size of the sludge block to prevent the sludge block from falling from the air hole.
[0013] As an optional solution of the above-mentioned wet sludge drying and incineration system, the sludge blocks are in strip or granular form.
[0014] As an optional solution of the above-mentioned wet sludge drying and incineration system, the transmission mechanism includes a plurality of the transmission belts, the plurality of transmission belts are arranged at intervals in the vertical direction, and the wet sludge passes through the plurality of transmission belts in sequence from top to bottom.
[0015] As an optional solution for the above-mentioned wet sludge drying and incineration system, multiple conveyor belts are staggered in the vertical direction, and the conveying directions of two adjacent conveyor belts are opposite. After the wet sludge falls from one conveyor belt, it can be received and conveyed by the next conveyor belt.
[0016] As an optional solution of the above-mentioned wet sludge drying and incineration system, the drying and incineration system further includes an incineration device, and the incineration device includes:
[0017] A dry material bin, the dry material bin is connected to the discharge port to store dry sludge;
[0018] A gasifier, the gasifier is connected to the dry material bin through a conveyor, and the gasifier can gasify the dry sludge and generate combustible gas;
[0019] an incinerator, the incinerator being connected to the gasifier so that the combustible gas burns in the incinerator;
[0020] The first heat exchanger includes a first shell and a first heat exchange pipeline arranged in the shell, the first shell is connected to the incinerator, and the first heat exchange pipeline is connected to the air inlet.
[0021] As an optional solution of the above-mentioned wet sludge drying and incineration system, the drying and incineration system also includes a dehumidification device, the dehumidification device includes a dehumidification fan, the drying bin is provided with a second air outlet, and the dehumidification fan is connected to the second air outlet.
[0022] As an optional solution for the above-mentioned wet sludge drying and incineration system, the dehumidification device also includes a second heat exchanger, the second heat exchanger includes a second outer shell and a second heat exchange pipeline arranged in the outer shell, the second outer shell is connected to the dehumidification fan, and the second heat exchange pipeline is connected to the hot air circulation pipeline.
[0023] Beneficial effects of the present invention:
[0024] The present invention provides a wet sludge drying and incineration system. In the drying and incineration system, a drying bin is used to dry the wet sludge, and a circulating fan enables hot air to circulate through the drying bin through a hot air circulation pipeline, and the hot air can pass through the air holes of a conveyor belt, thereby increasing the contact area between the hot air and the wet sludge and improving the drying effect on the wet sludge. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a structural schematic diagram of the wet sludge drying and incineration system provided by the present invention;
[0026] Figure 2 It is a structural schematic diagram of the block making mechanism provided by the present invention;
[0027] Figure 3 It is a schematic diagram of the structure of the transmission belt provided by the present invention.
[0028] In the figure:
[0029] 1. Drying device; 11. Drying bin; 111. Air inlet; 112. First air outlet; 113. Feed inlet; 114. Feed outlet; 115. Second air outlet; 12. Conveyor belt;
[0030] 2. Hot air circulation pipeline;
[0031] 3. Circulation fan;
[0032] 4. Block making mechanism; 41. Block making disk; 411. Block making groove; 412. Cutting protrusion; 42. Block making channel;
[0033] 5. Incineration device; 51. Dry material bin; 52. Gasification furnace; 53. Incineration furnace; 54. First heat exchanger; 541. First shell; 542. First heat exchange pipeline;
[0034] 6. Dehumidification device; 61. Dehumidification fan; 62. Second heat exchanger; 621. Second shell; 622. Second heat exchange pipeline;
[0035] 7. First flue gas treatment device; 71. First spray tower; 72. First chimney;
[0036] 8. Second flue gas treatment device; 81. Second spray tower; 82. Second chimney. DETAILED DESCRIPTION
[0037] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0038] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.
[0039] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0040] Unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first feature being in direct contact with the second feature, or may include the first feature being in contact with the second feature through another feature between them instead of being in direct contact. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.
[0041] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.
[0042] This embodiment provides a wet sludge drying and incineration system (hereinafter referred to as the drying and incineration system), such as Figure 1As shown, the drying and incineration system includes a drying device 1 and a circulating fan 3. The drying device 1 includes a drying bin 11, which is used to dry wet sludge to form dry sludge. The drying bin 11 is provided with a feed inlet 113 for feeding wet sludge and a discharge outlet 114 for discharging dry sludge. In order to circulate the hot air, the circulating fan 3 is arranged on the hot air circulation pipeline 2, and the two ends of the hot air circulation pipeline 2 are respectively connected to the air inlet 111 and the first air outlet 112 of the drying bin 11.
[0043] In order to facilitate the movement of wet sludge in the drying bin 11 , the drying device 1 further includes a transmission mechanism, which includes a conveyor belt 12 . The conveyor belt 12 is provided with a plurality of air holes, and the conveyor belt 12 is configured to transmit the wet sludge entering from the feed port 113 to the discharge port 114 .
[0044] In the drying and incineration system, the drying bin 11 is used to dry the wet sludge, and the circulating fan 3 enables the hot air to circulate through the drying bin 11 through the hot air circulation pipeline 2. When the conveyor belt 12 drives the wet sludge from the feed port 113 to the discharge port 114, the hot air can pass through the pores of the conveyor belt 12, thereby increasing the contact area between the hot air and the wet sludge and improving the drying effect on the wet sludge.
[0045] Generally speaking, the process of converting wet sludge into dry sludge is to dry out the water in the wet sludge, but the dry sludge still contains substances such as microorganisms, parasite eggs and organic compounds. Figure 1 As shown, for further processing, the drying and incineration system also includes a dry material bin 51, a gasifier 52, an incinerator 53 and a first heat exchanger 54. The dry material bin 51 is connected to the discharge port 114 to store dry sludge; the gasifier 52 is connected to the dry material bin 51 through a conveyor, and the gasifier 52 can gasify the dry sludge and generate combustible gas; the incinerator 53 is connected to the gasifier 52 so that the combustible gas can be burned in the incinerator 53; the first heat exchanger 54 includes a first shell 541 and a first heat exchange pipeline 542 arranged in the shell, the first shell 541 is connected to the incinerator 53, and the first heat exchange pipeline 542 is connected to the air inlet 111.
[0046] The dry material bin 51 is used to store the dry sludge discharged from the discharge port 114. When the storage amount reaches a certain value, the dry sludge in the dry material bin 51 will be conveyed to the gasifier 52 by the conveyor. At this time, the dry sludge will be pyrolyzed and gasified in the gasifier 52, that is, under anaerobic or anoxic conditions, the macromolecules of the organic components in the dry sludge will break, generating combustible gas and residue.
[0047] The pyrolysis gasification technology can not only achieve the harmlessness, reduction and resource utilization of dry sludge, but also effectively overcome the dioxin pollution problem caused by incineration, wherein the residue is discharged through the slag discharge port at the bottom of the gasifier 52, and the generated combustible gas enters the incinerator 53 and then burns in the incinerator 53. The released heat can pass through the first heat exchanger 54 with the gas. After the heat is absorbed by the gas in the first heat exchange pipeline 542, the gas in the first heat exchange pipeline 542 enters the drying bin 11 through the air inlet 111, providing a heat source for the drying of the wet sludge.
[0048] Pyrolysis and gasification of dry sludge can convert low-grade heat sources into high-grade heat sources, increase the number of heat sources in the drying bin 11, improve the utilization rate of thermal energy, and greatly reduce smoke exhaust while reducing pollution to the environment.
[0049] Furthermore, the incineration device 5 also includes a gas purification furnace. The combustible gas generated by the gasification furnace 52 is preferentially subjected to multi-stage washing by the gas purification furnace. After the dust is removed and the desulfurization is completed, it enters the incineration furnace 53 for combustion, which can reduce the pollution of the flue gas finally discharged, thereby reducing the cost of flue gas treatment.
[0050] like Figure 1 As shown, the drying incineration system also includes a first flue gas treatment device 7, which is connected to the first heat exchanger 54. The delayed treatment device includes a plurality of first spray towers 71 connected in series. After the flue gas generated after the combustion of the combustible gas passes through a plurality of spray towers, the dust and toxic and harmful gases contained therein are purified, and the remaining clean gas is discharged through the first chimney 72.
[0051] It is understandable that the humidity in the drying bin 11 will increase as the amount of wet sludge being dried increases, causing the drying effect of the wet sludge to gradually deteriorate. Figure 1 As shown, to solve this problem, the drying and incineration system further includes a dehumidification device 6 , which includes a dehumidification fan 61 . The drying bin 11 is provided with a second air outlet 115 , and the dehumidification fan 61 is connected to the second air outlet 115 .
[0052] The dehumidification fan 61 can extract part of the gas in the drying bin 11 through the second air outlet 115, thereby reducing the total amount of water vapor in the gas discharged from the first air outlet 112, and can also reduce the humidity of the gas blown back into the air inlet 111 by the circulation fan 3, ensuring that the humidity in the drying bin 11 is within a suitable range, which is convenient for heating and drying the moisture in the wet sludge.
[0053] Furthermore, the dehumidification device 6 also includes a second heat exchanger 62, which includes a second shell 621 and a second heat exchange pipeline 622 arranged in the shell, the second shell 621 is connected to the dehumidification fan 61, and the second heat exchange pipeline 622 is connected to the hot air circulation pipeline 2. Among them, the temperature of the gas discharged from the second air outlet 115 is still relatively high. After being dehumidified by the dehumidification fan 61, the second heat exchanger 62 is used to recover the waste heat, which is conducive to improving the utilization rate of thermal energy and reducing energy consumption.
[0054] It is worth noting that the gas discharged from the second air outlet 115 may contain some dust, pollutant gas or microorganisms in addition to water vapor. Figure 1 As shown, in order to avoid polluting the environment, the dehumidification device 6 also includes a second flue gas treatment device 8, which is connected to the second heat exchanger 62. The second flue gas treatment device 8 includes a plurality of second spray towers 81 connected in series. After the gas passing through the second heat exchanger 62 passes through a plurality of spray towers, the dust, polluting gases or microorganisms contained therein are purified, and the remaining clean gas is discharged through the second chimney 82.
[0055] like Figure 1 and Figure 2 As shown, in order to increase the contact area between the wet sludge and the hot air, the drying device 1 also includes a block-making mechanism 4, which is arranged at the feed port 113. The block-making mechanism 4 includes two block-making disks 41 that rotate synchronously and in opposite directions. The outer periphery of the block-making disks 41 is provided with a block-making groove 411. The outer peripheral surfaces of the two block-making disks 41 abut to make the two block-making grooves 411 form a block-making channel 42, and the wet sludge can form sludge blocks through the block-making channel 42.
[0056] By the counter-rotation of the two agglomeration disks 41, when the wet sludge passes between the two agglomeration disks 41, the wet sludge will be squeezed by the agglomeration grooves 411 of the two agglomeration disks 41, and the wet sludge will be squeezed into block-shaped sludge blocks, which can greatly increase the specific surface area, that is, increase the total contact area between the wet sludge and the hot air. When the sludge blocks are transported by the conveyor belt 12, they are easy to be dried by the hot air, thereby improving the drying efficiency.
[0057] Furthermore, the agglomeration disk 41 is provided with a plurality of cutting protrusions 412 at intervals along the circumferential direction, and the cutting protrusions 412 of the two agglomeration disks 41 correspond to each other one by one to cut the wet sludge and form the wet sludge into sludge blocks. When the two agglomeration disks 41 extrude the wet sludge into shape, each time the cutting protrusions 412 of the two agglomeration disks 41 meet, the wet sludge can be cut once, so that the sludge blocks fall onto the conveyor belt 12. It is worth noting that by adjusting the number of the cutting protrusions 412 of the agglomeration disk 41, the distance between two adjacent cutting protrusions 412 can be controlled, that is, the size of the sludge blocks can be controlled.
[0058] In this embodiment, the sludge block is in strip or granular shape. When the agglomeration disk 41 has more cutting protrusions 412 , the sludge block is in granular shape, and when the agglomeration disk 41 has fewer cutting protrusions 412 , the sludge block is in strip shape.
[0059] It is worth noting that the size of the pores is smaller than the size of the sludge blocks to prevent the sludge blocks from falling from the pores. In other words, it is necessary to ensure that the sludge blocks do not fall from the pores. In this embodiment, the pores are round holes, and the sludge blocks have at least one dimension that is larger than the diameter of the pores.
[0060] like Figure 1 and Figure 3 As shown, in order to enable the wet sludge to be fully dried, the transmission mechanism includes a plurality of transmission belts 12, which are arranged at intervals in the vertical direction, and the wet sludge passes through the plurality of transmission belts 12 in sequence from top to bottom. The plurality of transmission belts 12 sequentially transmit the wet sludge, which can greatly increase the drying time of the wet sludge, thereby improving the drying effect.
[0061] Specifically, along the vertical direction, a plurality of conveyor belts 12 are arranged in an alternating manner, and the conveying directions of two adjacent conveyor belts 12 are opposite ( Figure 3 The arrow in the figure is the transmission direction of the conveyor belt 12. After the wet sludge falls from one conveyor belt 12, it can be received and transmitted by the next conveyor belt 12. That is to say, the next conveyor belt 12 will exceed the downstream end of the adjacent conveyor belt 12 above it in the transmission direction, so as to ensure that the wet sludge can fall on the next conveyor belt 12 adjacent to it at the downstream end of the transmission direction of one conveyor belt 12 and be transmitted in the opposite direction, which can not only ensure that the total transmission distance of the wet sludge is extended, but also save space.
[0062] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.
Claims
1. A wet sludge drying and incineration system, characterized in that: include: A drying device (1), comprising a drying bin (11) and a transmission mechanism, wherein the drying bin (11) is provided with an air inlet (111), a first air outlet (112), a feed port (113) and a discharge port (114), wherein the transmission mechanism comprises a transmission belt (12), wherein the transmission belt (12) is provided with a plurality of air holes, and wherein the transmission belt (12) is configured to transmit wet sludge entering through the feed port (113) to the discharge port (114); A hot air circulation pipeline (2), wherein two ends of the hot air circulation pipeline (2) are respectively connected to the air inlet (111) and the first air outlet (112); A circulation fan (3) is arranged on the hot air circulation pipeline (2), and the circulation fan (3) is configured to drive the flow of gas in the hot air circulation pipeline (2).
2. The wet sludge drying and incineration system according to claim 1, characterized in that: The drying device (1) further comprises a block-making mechanism (4), wherein the block-making mechanism (4) is arranged at the feed port (113), and the block-making mechanism (4) comprises two block-making disks (41) which rotate synchronously in opposite directions, and the outer periphery of the block-making disks (41) is provided with a block-making groove (411), and the outer peripheral surfaces of the two block-making disks (41) abut against each other so that the two block-making grooves (411) form a block-making channel (42), and the wet sludge can form sludge blocks through the block-making channel (42).
3. The wet sludge drying and incineration system according to claim 2, characterized in that: The agglomeration disk (41) is provided with a plurality of cutting protrusions (412) at intervals along the circumferential direction, and the cutting protrusions (412) of the two agglomeration disks (41) correspond one to one to cut the wet sludge to form the wet sludge into the sludge blocks.
4. The wet sludge drying and incineration system according to claim 2, characterized in that: The size of the air hole is smaller than the size of the sludge cake to prevent the sludge cake from falling from the air hole.
5. The wet sludge drying and incineration system according to claim 2, characterized in that: The sludge block is in strip or granular shape.
6. The wet sludge drying and incineration system according to claim 1, characterized in that: The transmission mechanism comprises a plurality of transmission belts (12), wherein the plurality of transmission belts (12) are arranged at intervals in the vertical direction, and the wet sludge passes through the plurality of transmission belts (12) in sequence from top to bottom.
7. The wet sludge drying and incineration system according to claim 6, characterized in that: In the vertical direction, the plurality of conveyor belts (12) are arranged in an alternating manner, and the conveying directions of two adjacent conveyor belts (12) are opposite, so that the wet sludge can be received and conveyed by the next conveyor belt (12) after falling from one conveyor belt (12).
8. The wet sludge drying and incineration system according to any one of claims 1 to 7, characterized in that: The drying and incineration system further comprises an incineration device (5), wherein the incineration device (5) comprises: A dry material bin (51), the dry material bin (51) being connected to the discharge port (114) for storing dry sludge; A gasifier (52), the gasifier (52) being connected to the dry material bin (51) via a conveyor, the gasifier (52) being capable of gasifying the dry sludge and generating combustible gas; an incinerator (53), the incinerator (53) being connected to the gasifier (52) so that the combustible gas burns in the incinerator (53); The first heat exchanger (54) comprises a first shell (541) and a first heat exchange pipeline (542) arranged in the shell, the first shell (541) is connected to the incinerator (53), and the first heat exchange pipeline (542) is connected to the air inlet (111).
9. The wet sludge drying and incineration system according to any one of claims 1 to 7, characterized in that: The drying and incineration system further comprises a dehumidification device (6), the dehumidification device (6) comprises a dehumidification fan (61), the drying bin (11) is provided with a second air outlet (115), and the dehumidification fan (61) is in communication with the second air outlet (115).
10. The wet sludge drying and incineration system according to claim 9, characterized in that: The dehumidification device (6) also includes a second heat exchanger (62), which includes a second outer shell (621) and a second heat exchange pipeline (622) arranged in the outer shell, the second outer shell (621) is connected to the dehumidification fan (61), and the second heat exchange pipeline (622) is connected to the hot air circulation pipeline (2).