CN112479540B - Sludge drying device and use method thereof - Google Patents
Sludge drying device and use method thereof Download PDFInfo
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- CN112479540B CN112479540B CN201910864478.1A CN201910864478A CN112479540B CN 112479540 B CN112479540 B CN 112479540B CN 201910864478 A CN201910864478 A CN 201910864478A CN 112479540 B CN112479540 B CN 112479540B
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- 239000010802 sludge Substances 0.000 title claims abstract description 267
- 238000001035 drying Methods 0.000 title claims abstract description 263
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000012530 fluid Substances 0.000 claims abstract description 91
- 238000004891 communication Methods 0.000 claims abstract description 12
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000009423 ventilation Methods 0.000 claims description 12
- 238000010008 shearing Methods 0.000 claims description 9
- 230000006698 induction Effects 0.000 claims description 4
- 230000001788 irregular Effects 0.000 claims description 3
- 230000002195 synergetic effect Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 238000007664 blowing Methods 0.000 description 21
- 230000000712 assembly Effects 0.000 description 20
- 238000000429 assembly Methods 0.000 description 20
- 238000012546 transfer Methods 0.000 description 17
- 238000003756 stirring Methods 0.000 description 11
- 230000001976 improved effect Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000007599 discharging Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000003213 activating effect Effects 0.000 description 2
- 238000001599 direct drying Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011295 pitch Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009969 flowable effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/13—Treatment of sludge; Devices therefor by de-watering, drying or thickening by heating
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention provides an axial air supply type sludge drying device which comprises a shell, wherein a drying chamber is formed in the shell, and the drying chamber is provided with a sludge feed inlet, a tail gas exhaust port and a sludge discharge port. A flipping unit having a flipping assembly. The axial air supply assembly comprises an air supply pipe and a screw piece, wherein the air supply pipe is provided with an axial hole and a vent hole which is in fluid communication with the axial hole and is formed on the pipe wall, and the screw piece is sleeved and fixed on the pipe wall of the air supply pipe through a shaft hole and comprises a positive screw piece or an inclined screw piece. The axial air supply assembly is arranged at the lower part of the drying chamber, the turning device is arranged above the axial air supply assembly, and a discharge hole on the end wall of the drying chamber is arranged between the turning device and the axial air supply assembly. The invention also provides a method for drying sludge by using the axial air supply type sludge drying device.
Description
Technical Field
The application relates to the field of sludge drying, in particular to an axial air supply type sludge drying device for sludge treatment and a method for drying sludge by using the axial air supply type sludge drying device.
Background
At present, common sludge treatment devices are indirect and direct drying equipment. The indirect drying apparatus is to convey steam, hot oil or hot water into a hollow shaft and a stirring blade running in a drying chamber to heat the shaft and the stirring blade, and then transfer heat to wet sludge in the drying chamber by using a heat conduction hollow shaft and the stirring blade to evaporate moisture in the sludge and gradually dry the same. However, since heat is transferred by the flow of hot oil or steam at high temperature in the hollow shaft and the stirring blade, the stirring blade is easily worn and broken, and the treated sludge has high water content and high tackiness. This results in not only a high failure rate of the sludge treatment equipment and a high energy consumption, but also a very low drying efficiency of the sludge. The direct drying apparatus directly acts hot air on sludge to evaporate moisture in the sludge, but the heat transfer efficiency is improved, but because the viscosity of the sludge is high, the ventilation holes are easily blocked, which not only affects the stability of the drying process, but also is difficult to realize sludge reduction due to uneven drying of the sludge, and the drying efficiency of the sludge is low, so that the drying of a large amount of sludge cannot be performed.
Therefore, it is necessary to provide a sludge drying device and method with low energy consumption, small volume and high drying efficiency.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides an axial air supply type sludge drying device, such as a single-body type axial air supply type sludge drying device. The axial air supply type sludge drying device comprises a shell with a drying chamber, a feeding hole, an exhaust hole and a discharging hole, wherein the feeding hole is arranged at the upper part of the drying chamber and used for drying sludge to be dried, the exhaust hole is used for discharging drying gas after drying the sludge, and the discharging hole is far away from the feeding hole and is arranged on the end wall of the drying chamber and used for drying the sludge; a flipping unit having at least one flipping assembly; and an axial air supply assembly. The axial air supply assembly is arranged at the lower part of the drying chamber in the vertical direction, the turning device is arranged above the axial air supply assembly, and the discharge hole is positioned between the turning device and the axial air supply assembly. The sludge is frequently contacted with the drying gas through the direct action of the drying gas from the axial air supply assembly on the sludge at the lower part of the drying chamber, the turning and pushing of the axial air supply assembly on the sludge and the continuous shearing, crushing and turning of the sludge by the turning assembly of the turning device, so that the problem of uneven internal and external drying degrees in the sludge drying process is solved.
The invention also provides a method for drying sludge by using the axial air supply type sludge drying device, which comprises the steps of driving a turning device positioned in a drying chamber, turning, crushing and shearing the sludge by using a turning component of the turning device. The air supply device is started to send the drying air into the air supply assembly arranged in the drying chamber and make the drying air enter the drying chamber. The induced draft device is started to enable the drying gas of the dried sludge to be discharged through the exhaust port. The air supply assembly is driven to cause the spiral piece to turn over and push the sludge. In addition, the hot drying gas can be obtained by introducing from a heat source or heating by a heating device, and the operations can be carried out sequentially, simultaneously or respectively according to the needs, so that the temperature of the drying gas is increased, the flow speed of the drying gas is increased, and the contact of the drying gas and the sludge is promoted. And then, under the synergistic effect of the turning device and the air supply assembly, the drying of the sludge is accelerated, and the dried sludge is discharged from the discharge hole. According to the axial air supply type sludge drying method, the air supply component is used for conveying the drying gas into the drying chamber, so that the drying gas directly acts on the sludge, and the sludge is continuously crushed and loosened in the operation process along with the turning, shearing and crushing of the turning component of the turning device and the turning and pushing of the air supply component, so that the area of direct contact between the drying gas and the sludge is increased, and the drying efficiency is improved.
In the axial air supply type sludge drying device, the rotation of the air supply assembly can effectively prevent sludge from adhering to the pipe wall of the air supply pipe of the air supply assembly, so that the blocking of the air vent of the air supply pipe can be prevented, the frequency of contact between the sludge and drying gas can be increased by turning and pushing the sludge by the spiral piece of the air supply assembly, so that the drying efficiency is improved, the bottom of the drying chamber is used for configuring the arc-shaped channel of the axial air supply assembly, and the position of the discharge port is beneficial to the running of the sludge along the longitudinal direction of the shell or the drying chamber, and the dried sludge is continuously turned in the continuous accumulation process, so that the drying process of the sludge is further accelerated. In the application of the invention, the axial air supply type sludge drying device can be designed into a single form, so that the sludge drying device with low energy consumption, small volume, compact structure and high drying efficiency can be obtained, and can be combined with other sludge treatment equipment. In the method for drying sludge by axial air supply, the air supply assembly is used for continuously inputting drying gas into the drying chamber and turning, shearing and crushing the sludge, so that the water in the sludge is continuously evaporated, and further, the time for drying the sludge is shortened, and the sludge reduction ratio is improved.
Specifically, the invention provides an axial air supply type sludge drying device, which comprises:
A housing in which a drying chamber is formed; a feed inlet for sludge to be dried and an exhaust outlet for drying gas after drying the sludge are provided on the upper part or the top of the drying chamber, and a discharge outlet for the dried sludge is provided on the end wall of the drying chamber away from the feed inlet; at least one flipping device, wherein the at least one flipping device has at least one flipping assembly; an axial air supply assembly, the axial air supply assembly comprising: an air supply duct for delivering a gas, the air supply duct having an axial bore and at least one vent formed in a wall of the air supply duct, wherein the at least one vent is in fluid communication with the axial bore; the spiral piece is provided with a shaft hole, is sleeved on the pipe wall of the air supply pipe through the shaft hole and is fixedly connected with the pipe wall of the air supply pipe; and the axial air supply assembly is arranged at the lower part of the drying chamber, and the at least one turning device is arranged above the axial air supply assembly, wherein a discharge hole on the end wall is arranged between the at least one turning device and the axial air supply assembly.
According to the above fluid delivery assembly, the screw member comprises a positive screw member or a tilting screw member, wherein the positive screw member is perpendicular to the axis or wall of the air supply pipe, and the tilting screw member is tilted at an angle to the wall of the pipe along the axis of the air supply pipe, and the tilting screw member comprises a right-angled screw member or a left-angled screw member.
According to the fluid delivery assembly, the spiral member comprises a plurality of spiral sections, and the plurality of spiral sections comprise a positive spiral section, a right-angled spiral section and a left-angled spiral section, wherein the positive spiral section is perpendicular to the axis or the pipe wall of the air supply pipe, the right-angled spiral section is inclined to the right by a certain angle relative to the axis or the pipe wall of the air supply pipe, and the left-angled spiral section is inclined to the left by a certain angle relative to the axis or the pipe wall of the air supply pipe.
According to the above-described fluid conveying assembly, any two of the positive spiral section, the right-angled spiral section, and the left-angled spiral section may be alternately arranged along the axial direction of the air supply duct, and each of the inclined spiral sections may have the same or different inclination angles.
According to the sludge drying device, the right-inclined spiral section and the left-inclined spiral section of the plurality of spiral sections can be arranged in pairs in the axial direction of the air supply pipe, and every two pairs of right-inclined spiral section and left-inclined spiral section are spaced apart from each other, wherein each spiral section can have the same or different inclination angles.
According to the sludge drying device, the at least one vent hole comprises a plurality of vent holes, wherein the plurality of vent holes are distributed on the pipe wall of the air supply pipe, and at least one part of the plurality of vent holes can be covered in the axial direction of the spiral piece or the spiral section.
According to the sludge drying apparatus described above, the plurality of ventilation holes may be located as much as possible below the inclined screw or the inclined screw section in a regular or irregular manner.
According to the sludge drying apparatus, the plurality of ventilation holes may be arranged such that the number of ventilation holes gradually increases from one end of the blast pipe to the other end thereof, and/or the aperture of the ventilation holes gradually increases along the length direction of the blast pipe.
According to the sludge drying device, one end of the air supply assembly can be connected with the driving device, the other end of the air supply assembly can be connected with the air supply device and is in fluid communication with the air supply device, and the driving device can drive the air supply pipe of the air supply assembly to rotate.
According to the sludge drying device, the air supply device is a blower, a fan or a gas pressurizing device.
According to the sludge drying device, the shell comprises the shell body, the bottom plate and the cover, wherein the feed inlet and the exhaust outlet can be arranged on the upper part of the shell body or on the cover.
According to the sludge drying device, the bottom plate is connected with the lower end of the side wall of the shell body, and two longitudinal side edges of the bottom plate extend obliquely inwards from the lower edge of the shell body in the transverse direction, so that the concave bottom of the drying chamber is formed.
According to the sludge drying device, the concave bottom of the drying chamber forms a longitudinal arc-shaped channel in the longitudinal direction of the shell, and the axial air supply assembly is positioned in the longitudinal arc-shaped channel.
According to the sludge drying device, the drying chamber is provided with the flat bottom, and the air supply assembly can be positioned at any position near the flat bottom.
According to the sludge drying apparatus, at least one of the turning assemblies has at least one blade or ratchet extending radially outwardly from the rotational axis for shearing, crushing and turning the sludge.
According to the sludge drying device, the at least one sludge stirring device comprises two sludge stirring devices which are arranged in parallel, and the two sludge stirring devices are positioned at the same height in the vertical direction and are symmetrically arranged relative to a vertical line passing through the axis of the axial air supply assembly.
According to the sludge drying apparatus described above, at least one of the two sludge turning devices includes a plurality of turning assemblies, each of the plurality of turning assemblies being spaced apart by a distance, wherein each turning assembly has one or more blades or ratchet teeth extending radially outwardly from the rotational axis.
The sludge drying device further comprises a heating device for heating the drying gas, wherein the heating device is positioned at the upstream or downstream of the air supply device.
The sludge drying device according to the above further comprises an induced draft device, wherein the induced draft device is connected with the exhaust port and is in fluid communication with the drying chamber.
According to the sludge drying device, the at least one turning device comprises two turning devices, wherein the rotating shaft of each turning device is parallel to the longitudinal direction of the drying chamber, and the connecting line between the axes of the rotating shafts of the two turning devices and the axis of the air supply pipe of the axial air supply assembly is in an inverted triangle shape in the transverse direction.
The invention also provides a method for drying sludge by using the axial air supply type sludge drying device, which comprises the following steps of driving a turning device arranged in a drying chamber of the sludge drying device to enable a turning component of the turning device to rotate around a rotating shaft of the turning device, so as to turn, shear and crush the sludge entering through a feed inlet of the drying chamber and positioned in the drying chamber; starting an air supply device to send the drying gas for the sludge to be dried into an air supply pipe of an air supply assembly arranged in the drying chamber and enable the drying gas to enter the drying chamber; starting an induced draft device to enable the drying gas after drying the sludge to be discharged through an exhaust port of the drying chamber; the air supply assembly is driven to rotate the air supply pipe and drive the spiral piece on the air supply pipe to push the sludge; and under the synergistic effect of the turning device and the air supply assembly, the drying of the sludge is accelerated, and the dried sludge is discharged from the discharge hole.
The method for drying sludge further comprises the step of adjusting the rotation speed and/or the rotation direction of the rotating shaft of the turning device.
The method for drying sludge further comprises the step of adjusting the rotation speed and/or the rotation direction of the air supply assembly.
The method for drying sludge according to the above further comprises the step of heating the drying gas of the sludge to be dried before entering the drying chamber by means of a heating device.
Drawings
The construction, advantages, and technical effects of the specific embodiments of the present application will be described in detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic perspective view of a fluid delivery assembly for a sludge treatment plant;
FIG. 2 is a longitudinal cross-sectional view of the fluid delivery assembly shown in FIG. 1;
FIG. 3 is a transverse cross-sectional view of the fluid delivery assembly shown in FIG. 1;
FIG. 4 is a schematic perspective view of another embodiment of a fluid delivery assembly;
FIG. 5 is a longitudinal cross-sectional view of the fluid delivery assembly of FIG. 4;
FIG. 6 is a schematic perspective view of yet another embodiment of a fluid delivery assembly;
FIG. 7 is a longitudinal cross-sectional view of the fluid delivery assembly of FIG. 6;
FIG. 8 is a longitudinal cross-sectional view of an axial air-fed sludge drying apparatus having an axial air-feeding assembly;
FIG. 9 is a cross-sectional view of the axial blowing sludge drying apparatus of FIG. 8;
FIG. 10 is a partially cut-away perspective view of the sludge drying apparatus of FIG. 8;
FIG. 11 is a partially cut-away perspective view of the housing of the sludge drying apparatus of FIG. 8; and
Fig. 12 is a flow chart of an axial blowing sludge drying method.
Detailed Description
Fig. 1 shows an embodiment of the fluid delivery assembly for a sludge treatment device of the present application in perspective view, while fig. 2 and 3 show the fluid delivery assembly of fig. 1 in longitudinal and transverse sectional views, respectively. As shown, fluid delivery assembly S includes a fluid delivery tube or feed cartridge 801 and a screw 802. The screw 802 may also be referred to as a screw or helical blade. Screw element 802 may be fitted over and fixedly attached to delivery tube 801 via its internal bore or shaft bore, or both. The fluid delivery assembly S may be generally disposed in a sludge treatment chamber or cavity of a sludge treatment apparatus, wherein both ends of the fluid delivery assembly S are rotatably supported on, for example, opposite walls of the sludge treatment chamber, and the fluid delivery assembly S may be rotated by a driving means connected to one end of the fluid delivery assembly S, and fluid may be delivered into the sludge treatment chamber through the delivery pipe 801 using a fluid supply means disposed at the other end of the fluid delivery assembly S.
The fluid transfer tube 801 may be formed from a tubular member having an inner bore or axial bore, for example, the transfer tube may be a cylindrical tube having a central bore. One or more fluid delivery apertures 804 are formed in the wall of the delivery tube 801, with the fluid delivery apertures 804 penetrating the wall in fluid communication with the internal or axial bore 803 of the delivery tube 801. Fluid may be delivered from one end of the delivery tube 801 into the bore 803 by a fluid supply, and fluid entering the bore 803 may exit the delivery tube 801 through a delivery aperture 804 in the tube wall, as indicated by the arrow in fig. 3, for example into a sludge treatment chamber.
Referring to fig. 1, the diameter of the internal or axial bore of the screw 802 may be designed to be approximately equal to or near the outer diameter of the delivery tube 801 so that the screw 802 fits over the wall of the delivery tube 801 and fixedly connects the two together by common means of connection, such as welding, bolting, riveting or bonding, or both. The screw 802 is fixedly mounted on the wall of the delivery tube 801 and forms a helically coiled radially outwardly extending fin on the wall. If the screw is turned 360 degrees along the outer circumferential surface of the transfer tube for transverse cutting, a plurality of generally truncated cones may be cut in the longitudinal direction of the screw. As can be clearly seen in the longitudinal cross-section of fig. 2, the cross-section of the spiral 802 presents a plurality of hatched strip portions distributed on the upper and lower sides of the delivery tube 801, wherein one end of each strip portion is connected to the wall of the delivery tube 801 and the other end extends radially outwards with respect to the axis of the delivery tube 801 or at an angle alpha from the wall. Each frustoconical body is generally trapezoidal in shape, although the upper and lower strap portions are slightly staggered relative to the longitudinal axis.
In fig. 2, the strip portion representing the helix or helical fin is inclined relative to the wall of the delivery tube, whereas typically the strip portion is disposed perpendicular to the longitudinal axis or wall of the delivery tube (see helix segment 802b1 in fig. 7) and assumes a generally disk shape if the revolution of 360 degrees intercepts a segment of the helix. In this context, a helix or helical fin that is substantially perpendicular to the longitudinal axis or wall of the delivery tube is referred to as a positive helix or positive helical fin, while a helix or helical fin that is at an oblique angle to the longitudinal axis or wall of the delivery tube is defined as an oblique helix or oblique helical fin. When the viewer is facing the cut-away helix, a helix inclined at an angle to the right with respect to the longitudinal axis or wall of the delivery tube is considered a right-angled helix, and a helix inclined at an angle to the left is considered a left-angled helix. That is, the screw 802 of the fluid delivery assembly S in fig. 2 is a right-angled screw. If a segment of the spiral is taken 360 degrees around the outer peripheral surface of the delivery tube, the cut segment of the spiral will take on a generally frustoconical or flared shape with the forward end of the cone abutting the wall of the delivery tube 801 and the rearward end of the cone extending obliquely rightward and radially outward along the longitudinal axis of the fluid delivery assembly S.
As described above, the fluid delivery assembly S is provided in the sludge treatment chamber generally for treating sludge in the sludge treatment chamber, wherein fluid is delivered into the sludge treatment chamber from the outside through the fluid delivery assembly S. The fluid may comprise, for example, a gas, a liquid, or other flowable substance. As described above, the conveying unit S may be provided in the sludge treatment chamber in the longitudinal direction of the sludge treatment chamber or in the width direction thereof. Alternatively, one or more transport assemblies may be provided in one sludge treatment chamber. The longitudinal blades of each conveying component S in the sludge treatment chamber can shield the sludge to be adhered to the pipe wall of the conveying pipe 801, can also generate the overturning and moving functions on the sludge, and can be independently provided with a driving device and a fluid supply device for each conveying component when a plurality of conveying components S are arranged, or can be connected with one or a plurality of driving devices or fluid supply devices through a connecting mechanism so as to realize independent or combined control on each conveying component. Of course, providing a transfer assembly along the longitudinal direction of the sludge treatment chamber helps to run the fluid entering the interior bore 803 of the fluid transfer tube 801 a longer distance along the length of the sludge treatment chamber and thus can enter the sludge treatment chamber through the fluid transfer holes 804 distributed on the walls of the transfer tube 801, thereby facilitating interaction between the fluid and the sludge. Due to the nature of the fluid or sludge or the viscosity of the fluid due to its interaction with the sludge, the transport holes 804 of the transport pipe 801 may be blocked, and thus, by tilting the screw 802 longitudinally at an angle to the right or left with respect to the pipe wall of the transport pipe 801, the transport holes 804 may be blocked, thereby reducing the chance of sludge in the sludge treatment chamber adhering to the transport pipe and, in turn, reducing the obstruction of fluid flow out of the transport holes 804 during fluid transport.
In fig. 1-3, the delivery tube 801 may be provided with one or more fluid delivery apertures 804 and the fluid delivery apertures 804 in the wall of the delivery tube 801 are obscured by a right-angled screw 802. The plurality of delivery holes 804 may be arranged or aligned in a regular or irregular manner and as much as possible below the inclined screw 802. The degree to which the inclined screw 802 obstructs the delivery aperture 804 depends on the angle α by which the screw 802 is inclined relative to the wall of the delivery tube 801, for example the angle α may have a value between 1 ° and 90 °, or between 10 ° and 70 °, or between 20 ° and 60 °. The person skilled in the art can determine the value of the inclination angle alpha based on the properties of the sludge and the fluid being transported. As described above, the fluid delivery assembly S is rotatably disposed within the sludge treatment chamber and the screw 802 is fixedly connected to the delivery tube 801 as one unit, thus both rotating together during operation of the fluid delivery assembly S. By rotating, sludge can be prevented from adhering to the walls of the transfer pipe 801 on the one hand, and fluid can be distributed more evenly to the area around the transfer pipe on the other hand. The screw 802 not only can shield the delivery hole to ensure smooth fluid flow, but also can move or run the sludge in the sludge treatment chamber along the longitudinal direction along with rotation, so that the uniformity, fluidity, viscosity, cooling and/or dryness of the sludge can be improved based on different requirements. In addition, directional distribution of fluid into the sludge treatment chamber may be achieved by providing different numbers or different pore sizes of the transfer holes 804 at different locations on the wall of the transfer tube. For example, the number of delivery holes may be gradually increased from one end of the delivery tube to the other end along the axis of the delivery tube, or the aperture of the delivery holes may be gradually increased. The fluid delivery assembly S may be rotated in different directions as desired by means of a drive device connected to one of the ends of the delivery tube 801.
Fig. 4 shows another embodiment of the fluid delivery assembly of the present application in perspective view, while fig. 5 shows the fluid delivery assembly of fig. 4 in longitudinal cross-section. As shown, fluid delivery assembly Sa includes a fluid delivery tube 801a and a screw 802a. Fluid delivery tube 801a is substantially the same structure as fluid delivery tube 801 shown in FIG. 1, but spiral piece 802a includes a plurality of spiral segments or portions 802a1-802a6, and each spiral segment may include a plurality of substantially frustoconical shapes as described above. The plurality of spiral segments 802a1-802a6 have identical bores or shaft bores, respectively, and each spiral segment is sleeved on the delivery tube 801a through its bore and fixedly connected thereto as a unit. Three spiral segments 802a1, 802a3, 802a5 of the plurality of spiral segments 802a1-802a6 are left-angled spiral segments, i.e., a first left-angled spiral fin, a second left-angled spiral fin, and a third left-angled spiral fin, respectively, and these left-angled spiral fins are left-angled with respect to the pipe wall of the pipe 801a, while the other three spiral segments 802a2, 802a4, 802a6 are right-angled spiral segments, i.e., a first right-angled spiral fin, a second right-angled spiral fin, and a third right-angled spiral fin, respectively, and these right-angled spiral fins are right-angled with respect to the pipe wall of the pipe 801, respectively. As noted above, by taking a longitudinal section along the longitudinal axis of the spiral 802a, it can be seen that if a transverse cut is made for each inclined spiral segment, once per revolution relative to the axis of the delivery tube, a plurality of generally frustoconical or flared portions can be obtained, with the small opening of the flared portion being attached to the wall of the delivery tube 801 and the large opening of the flared portion being oriented along the axis of the spiral 802a or delivery tube 801 towards the right or left end of the delivery tube. In the screw member 802a, three left-hand helical segments 802a1, 802a3, 802a5 and three right-hand helical segments 802a2, 802a4, 802a6 are alternately arranged in order at certain intervals on the wall of the conveying pipe 801a, and every two left-hand and right-hand helical segments 802a1 and 802a2, 802a3 and 802a4, 802a5 and 802a6 are arranged opposite to each other. The frustoconical tips of each pair of inclined helical segments are adjacent to each other with their bottoms facing away from each other and in opposite directions, e.g., the small openings of the flared portions of the second left-hand helical segment 802a3 and the second right-hand helical segment 802a4 face each other, while the large openings of their flared portions face the left and right ends of the delivery tube 801a, respectively, and face each other with the first right-hand helical segment 802a2 and the third left-hand helical segment 802a5, respectively, of the other pair. The spacing between the first pair of angled spiral sections 802a1, 802a2 and the second pair of angled spiral sections 802a3, 802a4, and between the second pair of angled spiral sections 802a3, 802a4 and the third pair of angled spiral sections 802a5, 802a6 may be greater than the distance between the pairs of angled spiral sections. Most of the fluid delivery holes 804a are located as much as possible below the inclined helical section so that fluid in the inner bore or axial bore 803a of the delivery tube 801a smoothly flows out of the delivery holes 804a and into the sludge treatment chamber. Although each of the inclined helical segments is shown as being inclined at the same angle α, it will be appreciated that each of the plurality of helical segments may be inclined at a different angle to the wall of the delivery tube, and may be inclined in different directions and may be combined in any desired pair. In other words, the person skilled in the art can select and arrange a plurality of inclined spiral segments, including their number, inclination direction, spiral direction, arrangement, etc., according to the needs of the processing sludge. For example, the design of the paired inclined spiral sections in this embodiment is such that when the fluid delivery pipe 801a rotates, one of the inclined spiral sections 802a1, 802a3, 802a5 and the inclined spiral section 802a2, 802a4, 802a6 pushes the sludge in one direction in the axial direction, and the other inclined spiral section retards the movement of the sludge, one of which is advantageous for the up-and-down movement of the sludge, so that the sludge can be turned or stirred, and the clogging of the delivery hole 804a by the sludge can be prevented.
Fig. 6 shows a further embodiment of the fluid delivery assembly of the present application in a perspective view, while fig. 7 is a fluid delivery assembly of fig. 6 shown in longitudinal cross-section. As shown, fluid delivery assembly Sb includes a fluid delivery tube 801b and a screw 802b. Fluid delivery tube 801b is substantially the same structure as fluid delivery tube 801 shown in FIG. 1, but spiral element 802b includes a plurality of spiral segments 802b1-802b6. The plurality of spiral segments 802b1-802b6 each have the same bore or shaft bore, and each spiral segment is sleeved on and fixedly connected to the delivery tube 801b by its bore. Three of the plurality of helical segments 802b1-802b6, 802a1, 802a3, 802a5, are positive helical segments, respectively, i.e., a first positive helical fin, a second positive helical fin, and a third positive helical fin, respectively, i.e., as previously described, the fin or strip portions of these positive helical segments are each generally perpendicular to the axis or wall of the delivery tube 801b, while the other three helical segments 802a2, 802a4, 802a6 are right-angled helical segments, respectively, i.e., a first right-angled helical fin, a second right-angled helical fin, and a third right-angled helical fin, respectively, and the fin or strip portions of these right-angled helical segments are each inclined rightward relative to the wall of the delivery tube 801b by an angle α. If each right-angled helical section is cut in one revolution transverse to the longitudinal axis of the delivery tube 801b, the bottom of the resulting generally frustoconical portion is toward the right end of the delivery tube. In the screw member 802b, three positive screw segments 802b1, 802b3, 802b5 and three right-angled screw segments 802b2, 802b4, 802b6 are alternately arranged in sequence at intervals on the wall of the delivery tube 801b along the longitudinal axis of the delivery tube. Most of the fluid delivery holes 804a are located below the right-angled helical sections 802a2, 802a4, 802a6, thereby helping to smooth fluid flow out of the delivery holes 804b and into the sludge treatment chamber in the bore or axial bore 803b of the delivery tube 801 b. In the screw member 802b, the screw directions of the positive screw segments 802b1, 802b3, 802b5 and the right-angled screw segments 802b2, 802b4, 802b6 are the same. This combined design of helical segments is desirable in that when the fluid transfer tube 801b is rotated in one direction, all helical segments will push the sludge in one direction in an axial direction, and the effect of the positive helical segment tends to move the sludge more than the effect of the positive helical segment, while the effect of the right-angled helical segment tends to promote smooth flow out of the transfer orifice 804b and partially displace the sludge. Also, although the right-angled helical sections are shown as all being angled at the same angle α, it will be appreciated that a person skilled in the art may select and arrange a plurality of angled helical sections, including their type, number, direction of inclination, helical orientation, arrangement, etc., as desired for processing sludge. Either a single screw or multiple screw segments are typically arranged in the middle of the transfer tube so that when fluid transfer assemblies such as S, sa and Sb are installed, the single screw or multiple screw segments are located within the sludge treatment chamber.
As noted above, the fluid delivery assembly of the present application may have a single positive screw, a left-angled or right-angled screw, or may have a screw comprising a plurality of differently oriented screw segments, e.g., the plurality of screw segments may comprise one or more positive screw segments, one or more left-angled screw segments, and/or one or more right-angled screw segments. It will be appreciated that the fins or strip portions of each inclined helical section of the helix may be curved or arcuate, for example, and that the angle between them and the wall of the delivery tube 801 may be determined by the angle between the straight line passing through the two points of the forward and rearward ends of the centreline of the curved strip portions in the thickness direction and the wall of the delivery tube 801. The strip portion of each inclined helical segment may for example have a different curvature or slope. When it is not necessary to block the delivery holes 804, a positive screw or multiple positive screw segments may be provided on the delivery tube in its entirety.
Fig. 8 shows an embodiment of a axially air-fed sludge drying apparatus with an air-feeding assembly in a longitudinal section, while fig. 9 shows the sludge drying apparatus shown in fig. 8 in a transverse section. As described above, the fluid delivery assemblies S, sa and Sb of the present application can deliver both liquid and gas, and thus, as an example, are used to deliver gas in the sludge drying apparatus 1, and thus, may be referred to as a blower assembly 8 or a ventilation assembly.
As shown, the axial blowing sludge drying apparatus 1 has a housing, which includes, for example, a body 2, a cover 3, and a bottom plate 4, and a space inside the housing constitutes a drying chamber 6 for drying sludge. In addition, the housing may be constructed from multiple components or in a variety of ways, for example, the body 2 may be integrally formed with the base plate 4, or the like. The upper portion of the housing is rectangular in shape, but may be square, polygonal, oval or other shape. A feed port 11 for feeding sludge to be dried or dried into the drying chamber and an exhaust port 13 for exhausting tail gas or dry gas after drying the sludge are provided on the cover 3, respectively, and a discharge port 12 for discharging the dried sludge is provided on the end wall of the body 2 at a position approximately midway away from the feed port 11. In another embodiment, the inlet 11 and the outlet 13 may be provided at desired positions on the cover 3 or the body 2, respectively, as needed, in other words, they may be located at arbitrary positions on the upper portion of the drying chamber 6, while the outlet 12 may be provided on the side wall, or near the bottom portion of the drying chamber, etc. The body 2 may be secured to the base plate 4 by a common connection such as welding, riveting or bolting.
The sludge drying apparatus 1 further comprises two turning devices 7a, 7b and a blower assembly 8 provided in the housing for turning, crushing and shearing sludge, wherein, for the sake of illustration, the fluid delivery assembly Sb of the above-mentioned fluid delivery assemblies S, sa and Sb is selected as the blower assembly 8. The air supply assembly 8 may be arranged in the drying chamber 6 in the middle or near the bottom, while the flipping means 7a, 7b are located above and parallel to the air supply assembly 8. In order to deliver as much drying gas as possible into the drying chamber 6 of the sludge drying apparatus, the air supply assembly 8 is usually arranged in the longitudinal direction of the drying chamber 6, for example substantially horizontally or parallel to the floor 4 of the drying chamber. During the drying gas entering the drying chamber through the air supply assembly 8, the spiral piece 802b can shield the vent hole 804b formed on the pipe wall of the air supply pipe 801b below the air supply assembly 8 along with the rotation of the air supply assembly 8, so as to ensure the gas to smoothly flow out of the air supply pipe, and can push the sludge to move towards one end of the drying chamber 6, for example, to make the sludge move towards the end wall with the discharge hole 12. Both ends of the blast pipe 801b of the blast assembly 8 are rotatably supported in shaft holes 5c formed at opposite end walls of the drying chamber 6, respectively. In another embodiment, the two ends of the air supply assembly 8 may extend through the respective shaft holes 5c to the outside of the opposite end walls, wherein the two ends of the air supply pipe 801b of the air supply assembly 8 are rotatably supported on the external supporting device, and further, the two ends of the air supply pipe 801b may be connected to the driving device and the air supply device 10, respectively. Since the drying gas is transported along the axial direction or the longitudinal direction of the housing of the sludge drying apparatus 1 by the inner hole or the axial hole 803b of the blast pipe 801b of the blast assembly 8, the blast assembly 8 may also be referred to as an axial blast assembly.
The bottom plate 4 of the housing is a curved plate having an arc shape, wherein the curved plate is fixedly connected with the lower end of the side wall of the rectangular body 2, and the middle of the curved plate is concave downward as seen from the transverse direction, namely, the two side edges of the body 2 are respectively inclined downward toward the middle and converged into the arc shape. In the cross section of the housing, the two longitudinal sides of the housing taper diagonally inward and transition to an arcuate bottom at the junction of the body 2 and the floor 4 generally above the air moving assembly. The bottom region of the drying chamber 6 is recessed laterally as seen from the inside of the housing, so that a longitudinal arc-shaped channel is formed in the longitudinal direction, in which the air supply assembly 8 is arranged. For example, the bottom of the drying chamber 6 may be formed in a circular arc shape, and the radius of the circular arc may be slightly larger than the radius of the screw 802b of the air blowing assembly so that a uniform interval or gap is maintained between the screw 802b and the bottom of the drying chamber. The air duct 801b of the air supply assembly 8 is provided with a power input 14c at one end, e.g. the right end, for connection to the drive means, and at its other end, e.g. the left end, is connected to and in fluid communication with the air supply means 10 via the connection means 9. The air supply device may be a blower, a fan, a gas pressurizing device, or the like. Since the air supply assembly 8 is substantially the same as the fluid delivery assembly Sb described above, the configuration of the air supply assembly 8 can be referred to the description of the fluid delivery assembly Sb, and will not be repeated here.
The air supply assembly 8 is rotatably disposed in holes 5c formed in two opposite end walls of the drying chamber respectively corresponding to the longitudinal arc-shaped passages, while the screw members 802b of the three positive screw segments 802a1, 802a3, 802a5 and the three right-angled screw segments 802b2, 802b4, 802b6 alternately disposed on the air supply duct 801b are located in the drying chamber 6, wherein each right-angled screw segment is inclined toward the power input member 14c, respectively. One end, e.g. the right end, of the air supply tube 801b extends outwardly from the aperture 5c in the right end wall of the drying chamber 6 and may be connected to the drive means by means of a power input 14c provided thereon. Likewise, the other end, e.g., the left end, of the air supply tube 801b extends outwardly from the aperture 5c in the left end wall of the drying chamber 6 and is connected to and in fluid communication with the air supply device 10 by the connecting means 9. It should be understood that whatever the connection means used, it is ensured that the drying gas is fed by the blowing device 10 into the inner bore 803b of the blowing pipe 801b and runs in the axial direction of the blowing pipe from one end to the other, for example from left to right, towards the power input 14c, so that the drying gas can flow out through the ventilation holes 804b formed in the pipe wall of the blowing pipe and into the sludge drying chamber 6, respectively.
The two flipping means 7a, 7b have a rotation shaft 701a, 701b and a plurality of flipping assemblies 702a, 702b mounted thereon, respectively. Since both have the same or similar structure or configuration, only one of the flipping means 7a will be described herein. As shown, a plurality of turning assemblies 702a for turning, crushing and shearing sludge are fixedly installed on the rotating shaft 701a at a certain interval along the axis of the rotating shaft, respectively, and each turning assembly 702a is provided with one or more blades or ratchets, for example, blades or ratchets 703a. The rotary shafts 701a are respectively provided in shaft holes 5a on two opposite end walls of the body 2 in the longitudinal direction of the housing, and a power input member 14a for connection with a driving device is provided at one end of the rotary shafts 701 a. In addition, the turning device can be made to displace sludge in the longitudinal direction of the drying chamber by the shape of the blades or ratchet teeth of the turning assembly designed to turn, break and shear the sludge.
Fig. 10 shows the sludge drying apparatus of fig. 8 in a partial perspective view. As shown, two flipping means 7a, 7b are arranged in parallel in the longitudinal direction a of the housing in the upper part of the drying chamber. Similarly, each flipping means 7a, 7b may be rotatably supported at both ends thereof in shaft holes 5a, 5b formed in opposite end walls of the drying chamber 6, respectively, and may also extend beyond the opposite end walls through the respective shaft holes 5a, 5b and be rotatably supported on external bearing means. Although the two flipping means 7a, 7b are substantially identical and arranged at the same height in the vertical direction, the person skilled in the art may have different configurations for the two flipping means 7a, 7b depending on the process requirements for drying sludge or the internal structure of the housing. For example, a plurality of flipping assemblies 702a, 702b on two flipping devices 7a, 7b are disposed on the respective rotation shafts 701a, 701b at different pitches, respectively. For example, one or several of the plurality of flip assemblies 702a, 702b have blades or ratchet teeth 703a, 703b, respectively, of different lengths. For example, a plurality of flipping assemblies 702a, 702b on two flipping devices 7a, 7b are disposed on the respective rotation shafts 701a, 701b at different pitches, respectively. For example, the plurality of flipping assemblies 702a of the flipping unit 7a and the plurality of flipping assemblies 702b of the flipping unit 7b may be disposed to cross each other. In a further embodiment, the two flipping means 7a, 7b may be arranged at different heights, respectively. In other words, the number of flipping assemblies, the spacing between adjacent flipping assemblies, the number, shape or size of the blades or ratchets, and the positions between the plurality of flipping devices may be arbitrarily arranged by those skilled in the art in accordance with the concept of the present invention.
Fig. 11 shows a housing for the sludge drying apparatus of fig. 8 in a partial perspective view. As shown in the drawing, shaft holes 5a, 5b are formed in the longitudinal direction of the housing on two opposite end walls thereof, respectively, rotating shafts 701a, 701b for providing two turning devices 7a, 7b for turning, crushing, shearing sludge, and shaft holes 5c for providing an air supply pipe 801b of the air supply assembly 8. Since the shaft holes 5a, 5b for the two flipping means 7a, 7b provided above the air blowing assembly 8 are at the same height, and the shaft hole 5c is located between and below the shaft holes 5a, 5b, i.e. at different heights, the central line of the shaft holes 5a, 5b and the shaft hole 5c forms a triangle. For example, it can be seen on the end wall provided with a discharge opening 12 for discharging dried sludge that the shaft hole 5c is located at the apex of the inverted triangle, while the shaft holes 5a, 5b are located at two points at the base of the inverted triangle, respectively. The shaft holes 5a, 5b for the two flipping means 7a, 7b are arranged symmetrically with respect to a vertical line passing through the center of the shaft hole 5c for the blower assembly 8 in the lateral direction, while the discharge opening 12 is provided near the vertical line in the middle of the inverted triangle. This design allows the dried sludge to be continuously turned or stirred and pushed under the cooperation of the two turning devices 7a, 7b located above and the air supply assembly 8 located below, while being pushed to the discharge opening 12 located between the turning device 7 and the air supply assembly 8.
In another embodiment, the bottom of the drying chamber 6 of the sludge drying apparatus 1 may be flat, i.e. the bottom plate 4 is a flat plate or a curved plate, so that the air blowing assembly 8 may be arranged in the middle of the drying chamber 6 or at any position adjacent to the bottom, so that an asymmetric inverted triangle may be formed between the shaft holes 5a, 5b for the two flipping means 7a, 7b and the central line of the shaft hole 5c for the air blowing assembly 8 in the lateral direction. In addition, one or more air blowing assemblies and one or more flipping devices may be provided in the drying chamber as needed. For example, one end of the air pipe 801b of the air blowing unit 8 may be connected to both the driving device and the air blowing device 10. In addition, in order to accelerate the flow of dried gas or off-gas out of the drying chamber, a draught device (not shown) may be connected via a pipe to the exhaust opening 13 on the cover 3 in fluid communication with the drying chamber 6. For example, if hot gas is used as the drying gas, a heating device (not shown) may be provided to heat the drying gas entering the blower assembly 8, and the heating device may be provided before or after the blower assembly 10. In another embodiment, the heating means may be removed, hot gas or steam may be directly introduced as a drying gas into the drying chamber to be in direct contact with the sludge, and the sludge may be dried.
Although only a single housing or a unitary sludge drying apparatus is shown and described herein, it will be appreciated that one skilled in the art may utilize the above described apparatus or components in a sludge drying chamber in other sludge treatment facilities and perform similar arrangements based thereon.
Fig. 12 is a flowchart showing an embodiment of the sludge drying method using the axial air blowing method according to the present application. The axial air-supply type sludge drying method of the application can utilize the axial air-supply type sludge drying device similar to that shown in fig. 8 and 9 to dry the sludge. Referring to fig. 8-11, the process of treating sludge may be performed, for example, as sludge to be dried is fed into the drying chamber through a feed port by a not-shown conveyor, for example, through the feed port 11, and in step 1, a driving means first drives a turning means, for example, a turning shaft 701a, 701b by a power input 14a to rotate a plurality of turning assemblies 702a, 702b, so that blades or ratchets 703a, 703b on each turning assembly constantly turn, break and shear the sludge. In step 2, an air supply device, such as air supply device 10, is activated to deliver drying air into an air supply duct of the air supply assembly, such as inner bore 803b of air supply duct 801, whereby the drying air flows out through air vents 804b in the duct walls of the air supply duct and into a drying chamber, such as drying chamber 6. Next, in order to accelerate the flow of the dried gas or exhaust, in step 3, the air induction means is activated so that the exhaust rapidly flows out of the drying chamber through an exhaust, for example, the exhaust 13. Typically, the air supply means may be a blower means such as a blower or fan, and the air inducing means may be an induced draft fan. Alternatively, the air pressurizing device may be used instead of the air blowing device to convey the drying air into the drying chamber at a certain pressure, thereby accelerating the flow of the drying air into the drying chamber. The pressure reducing device can be used for replacing the induced air device to accelerate the flow velocity of the tail gas, so that the sludge drying efficiency is improved. In another embodiment, the step of adjusting the turning direction and/or the rotation speed of the rotation shaft of the turning device may be added as needed after the step 1 driving device drives the turning device, for example, step 1a, and then the blower device is restarted. After the air inducing device is started, in step 4, the air supply assembly is driven, and the air supply assembly, that is, the air supply pipe, is rotated by the driving device to drive the spiral piece to turn or stir to push the sludge, for example, the air supply pipe 801b is driven by the power input piece 14c to rotate together with the spiral piece 802, wherein the spiral piece can also play a role of moving the sludge while shielding the sludge. Subsequently, in step 5, the drying of the sludge is accelerated by the cooperation of the turning assembly of the turning device and the screw of the air supply assembly, and the dried sludge is discharged out of a discharge opening, such as the discharge opening 12. In yet another aspect, after the step 4 of driving the blower assembly to rotate, a step of adjusting the direction and/or rotation speed of the blower assembly may be added as needed, for example, step 4a, so that the dried sludge is in a better drying state, and the dried sludge is discharged after the desired dried sludge is obtained. In another embodiment, if it is desired to dry the sludge with hot drying gas, the drying gas to be introduced into the drying chamber may be heated by means of a heating device provided additionally. the heating step may be arranged after driving the flipping means, e.g. step 1b. In another variant, not shown, it is possible to control the rotation of a plurality of flipping means, for example the rotation shafts 701a, 701b of the flipping means 7a, 7b or to keep the blower assembly 8 stationary, respectively. In yet another arrangement, not shown, a heat source with hot drying gas may be in fluid communication with the piping before or after the blower means to feed the hot drying gas into the blower pipes of the blower assembly. In a further solution, not shown, the heating means may be activated after activating the air supply means and the air inducing means separately or simultaneously, or after activating the air supply assembly. In a further variant, which is not shown, the turning direction and/or the rotational speed of the rotational shaft of the turning device can be adjusted after the heating device, the air supply device and/or the air induction device have been activated. In a further solution, not shown, the turning direction and/or the rotational speed of the air supply assembly may be adjusted before the heating means, the air supply means and/or the air inducing means are activated. In a further variant, not shown, the blower assembly is rotated before the drive drives the turning device, after which the heating device, the blower and/or the air-guiding device are each activated. In a further version, not shown, the turning device's axis of rotation and the blower assembly may also be adjusted such that multiple turning device's axes of rotation, such as axes of rotation 701a, 701b, may rotate in the same or opposite direction as each other, while the blower assembly and axes of rotation 701a, 701b rotate together or in the same or opposite direction as one of the two.
The sludge is continuously sheared, crushed and turned through the turning component, the air supply component is pushed, and the granularity of the sludge is gradually reduced to become particles and then is partially made into particles under the action of the drying gas entering the drying chamber, so that the drying degree of the sludge is continuously improved. For example, when the air supply assembly and the plurality of rotating shafts of the turning device rotate together in the same direction, the turning assembly of the turning device and the screw member of the air supply assembly help to accelerate the movement of the sludge toward the end wall with the discharge port, and when the rotation directions of the two are different, the movement of the sludge is slowed down. Therefore, the rotating shaft of each turning device or the rotating speed and/or the rotating direction of the air supply assembly, the feeding speed of the drying gas, the gas temperature and the like are/is adjusted timely according to the drying degree of the sludge, so that the sludge drying efficiency is improved. It should be noted that the effect of the blower assembly, i.e. the screw, is described herein with an excessive emphasis on the effect of pushing the sludge, however, the screw also has the effect of stirring or agitating the sludge, in particular with conveying assemblies having different arrangements or shapes of screws or screw section structures, such as S, sa, sb, the force of stirring or agitating the sludge being slightly different. For example, when both the positive screw section and the inclined screw section are provided in the screw member, although both the positive screw section and the inclined screw section can push the sludge to move in the longitudinal direction of the drying chamber, the strength is strong and weak, the sludge which is not pushed is turned up and down, and the inclined screw section or the inclined screw fin can also block the ventilation hole which is positioned below the positive screw section and formed on the blast pipe. As described above, the air blowing assembly is disposed in the drying chamber adjacent to the bottom, and the drying gas first acts on the sludge located in the bottom of the drying chamber, so that the sludge is continuously dried as the dried sludge is moved by the screw along the longitudinal passage toward one end of the drying chamber, and in particular, the sludge screw is pushed down to be continuously stacked, turned or agitated, moved, and gradually moved out of the discharge port by the combined action of the screw of the air blowing assembly and the turning assembly of the turning device. It is obvious to the person skilled in the art that when a turning device having a function of pushing the sludge in the axial direction is not used, the dried sludge can be discharged through a discharge port provided at a proper position of the drying chamber.
Although the axial-blowing sludge drying apparatus is shown in a single unit, the axial-blowing sludge drying apparatus of the present application may be part of other sludge treatment apparatuses. It will be appreciated that in the method of the application, the heating means may be removed when using e.g. a chemical-containing, ambient or cooled gas or a gas with a specific composition, based on the different treatment requirements of the sludge. Of course, the dry gas referred to in the present application includes, but is not limited to, a gas containing a chemical substance, a gas at normal temperature or cooled, a hot gas, or a gas having a specific composition, and the like.
In the present invention, although various embodiments are exemplified, the present invention is not limited to the description, and a person skilled in the art can completely make variations and modifications of the respective components, assemblies or devices and the axial blowing type sludge drying method in the sludge drying apparatus according to the above-described design ideas of the present invention, and such variations and modifications are within the scope of the idea of the present invention.
Claims (24)
1. An axial air-supply type sludge drying device, the sludge drying device comprising:
a housing in which a drying chamber is formed;
A feed inlet for sludge to be dried and an exhaust outlet for drying gas after drying the sludge are provided on the upper part or the top of the drying chamber, and a discharge outlet for the dried sludge is provided on the end wall of the drying chamber away from the feed inlet;
at least one flipping device, wherein the at least one flipping device has at least one flipping assembly;
An axial air supply assembly, the axial air supply assembly comprising:
an air supply tube for delivering a gas, the air supply tube having an axial bore and at least one vent formed in a tube wall thereof, wherein the at least one vent is in fluid communication with the axial bore;
The spiral piece is provided with a shaft hole, is sleeved on the pipe wall of the air supply pipe through the shaft hole and is fixedly connected with the pipe wall of the air supply pipe; and
The axial air supply assembly is arranged at the lower part of the drying chamber, the at least one turning device is arranged above the axial air supply assembly, wherein the discharge hole on the end wall is arranged between the at least one turning device and the axial air supply assembly,
The screw member includes a plurality of positive screw members and a plurality of inclined screw members alternately arranged in turn at regular intervals along a longitudinal axis of the blast pipe, wherein the positive screw members are perpendicular to an axis or a pipe wall of the blast pipe, and the inclined screw members are inclined at an angle with respect to the pipe wall along the axis of the blast pipe, and the vent hole is located below the inclined screw members, thereby helping fluid in an axial hole of the blast pipe smoothly flow out of the inclined screw members and into the drying chamber, screw directions of the positive screw members and the inclined screw members are the same, the positive screw members are configured to move sludge, and the inclined screw members are configured to promote the fluid smoothly flow out of the vent hole and partially play a role of pushing the sludge.
2. The sludge drying apparatus of claim 1 wherein the inclined screw member comprises a right-inclined screw member or a left-inclined screw member.
3. The sludge drying apparatus of claim 1 wherein the screw member comprises a plurality of screw segments and the plurality of screw segments comprises a positive screw segment, a right-angled screw segment and a left-angled screw segment, wherein the positive screw segment is perpendicular to the axis or wall of the blast pipe, the right-angled screw segment is angled to the right relative to the axis or wall of the blast pipe, and the left-angled screw segment is angled to the left relative to the axis or wall of the blast pipe.
4. A sludge drying apparatus as claimed in claim 3 wherein each inclined helical section has the same or a different inclination angle.
5. A sludge drying apparatus as claimed in claim 3, wherein the right-angled spiral section and the left-angled spiral section of the plurality of spiral sections are arranged in pairs in the axial direction of the blast pipe, and each two pairs of the right-angled spiral section and the left-angled spiral section are spaced apart from each other, wherein each spiral section has the same or different inclination angle.
6. A sludge drying apparatus as claimed in claim 3 wherein said at least one vent comprises a plurality of vents, wherein said plurality of vents are distributed on the wall of said air supply duct and said screw or said screw section axially overlies at least a portion of said plurality of vents.
7. A sludge drying apparatus as claimed in claim 3 wherein said plurality of ventilation holes are located in a regular or irregular manner beneath said inclined screw or said right-angled screw or left-angled screw section.
8. A sludge drying apparatus according to any one of claims 1-3 wherein said plurality of ventilation holes are arranged in a direction along the length of said blast pipe such that the number of ventilation holes increases gradually from one end of said blast pipe to the other end thereof, and/or the aperture of the ventilation holes increases gradually.
9. A sludge drying apparatus according to any one of claims 1 to 3 wherein said one end of said air supply assembly is connected to a drive means and the other end of said air supply assembly is connected to and in fluid communication with an air supply means, said drive means driving rotation of said air supply duct of said air supply assembly.
10. A sludge drying apparatus as claimed in any one of claims 1 to 3 wherein the air supply assembly is a blower, fan or gas pressurizing means.
11. A sludge drying apparatus according to any one of claims 1 to 3 wherein the housing comprises a housing body, a floor and a cover, wherein the inlet and the outlet are provided on an upper part or cover of the housing body.
12. The sludge drying apparatus of claim 11 wherein the bottom plate is connected to the lower end of the side wall of the housing body and both longitudinal sides of the bottom plate extend obliquely inward from the lower side of the housing body in a lateral direction, thereby forming a concave bottom of the drying chamber.
13. A sludge drying apparatus as claimed in any one of claims 1 to 3 wherein the concave bottom of the drying chamber forms a longitudinal arcuate path in the longitudinal direction of the housing and the axial air supply assembly is located within the longitudinal arcuate path.
14. A sludge drying apparatus as claimed in any one of claims 1 to 3 wherein the drying chamber has a flat bottom and the air supply assembly is located at any position adjacent the flat bottom.
15. A sludge drying apparatus as claimed in any one of claims 1 to 3 wherein the at least one flipping assembly has at least one blade or ratchet extending radially outwardly from the rotational axis for shearing, crushing and flipping the sludge.
16. A sludge drying apparatus according to any one of claims 1 to 3 wherein the at least one sludge turning device comprises two sludge turning devices arranged in parallel, the two sludge turning devices being located at the same height in the vertical direction and being symmetrically arranged with respect to a vertical line passing through the axis of the axial air supply assembly.
17. The sludge drying apparatus of claim 16 wherein at least one of the two sludge flipping means comprises a plurality of flipping means, each of the plurality of flipping means being spaced apart a distance therebetween, wherein each of the plurality of flipping means has one or more blades or ratchet teeth extending radially outwardly from the rotational axis.
18. A sludge drying apparatus as claimed in any one of claims 1 to 3 further comprising heating means for heating the drying gas, wherein the heating means is located upstream or downstream of the air supply assembly.
19. A sludge drying apparatus as claimed in any one of claims 1 to 3 further comprising air induction means, wherein the air induction means is connected to the air outlet and is in fluid communication with the drying chamber.
20. A sludge drying apparatus according to any one of claims 1 to 3 wherein the at least one turning means comprises two turning means, wherein the axis of rotation of each turning means is arranged parallel to the longitudinal direction of the drying chamber and the line between the axis of rotation of the two turning means and the axis of the blast pipe of the axial blast assembly is inverted triangular in transverse direction.
21. A method of drying sludge using a sludge drying apparatus according to any one of claims 1 to 20, the method comprising the steps of:
Driving a turning device arranged in a drying chamber of the sludge drying device to enable a turning assembly of the turning device to rotate around a rotating shaft of the turning device so as to turn, shear and crush sludge entering through a feed inlet of the drying chamber and positioned in the drying chamber;
Starting an air supply device to send dry air for sludge to be dried into an air supply pipe of an air supply assembly arranged in the drying chamber and enable the dry air to enter the drying chamber;
Starting an induced draft device to enable the drying gas after drying the sludge to be discharged through an exhaust port of the drying chamber;
The air supply assembly is driven to rotate the air supply pipe and drive the spiral piece on the air supply assembly to push sludge; and
Under the synergistic effect of the turning device and the air supply assembly, the drying of the sludge is quickened, and the dried sludge is discharged from the discharge hole.
22. A method of drying sludge as claimed in claim 21 wherein the step further comprises adjusting the rotational speed and/or direction of rotation of the rotatable shaft of the flipping means.
23. A method of drying sludge as claimed in claim 21 wherein the step further comprises adjusting the rotational speed and/or rotational direction of said air moving assembly.
24. A method of drying sludge according to any one of claims 21 to 23, further comprising the step of heating drying gas of sludge to be dried prior to entering the drying chamber with the heating means.
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| CN201910864478.1A CN112479540B (en) | 2019-09-12 | 2019-09-12 | Sludge drying device and use method thereof |
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