Sludge fluidized drying device

Abstract

The utility model provides a sludge fluidization drying device, which belongs to the technical field of sludge drying treatment and comprises a fluidization heat exchange chamber, a fluidization air bellow and a fluidization air conveying mechanism. The fluidization air box is horizontally arranged at the lower part of a bottom plate of the fluidization heat exchange chamber; a fluidization air inlet is formed in one end of the fluidization air box; the fluidization air conveying mechanism comprises a plurality of fluidization air guide pipes which are uniformly distributed on a top plate of the fluidization air box and fluidization air caps which are arranged at air outlets in the top ends of the fluidization air guide pipes; an air inlet in the bottom end of the fluidization air guide pipe is formed in the fluidization air box; an air outlet in the top end of the fluidization air guide pipe is formed above a bottom plate of the fluidization heat exchange chamber; a plurality of air holes are uniformly distributed in the fluidization air cap along the circumferential direction; orifices of the air holes incline downwards. The sludge drying device can solve the problems of high energy consumption, poor heat exchange effect and the like of a method for carrying out heat exchange drying on wet sludge by adopting a heat exchanger in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of sludge drying and treatment technology, and more specifically, to a sludge fluidized bed drying device. Background Technology

[0002] In the process of sewage treatment, a large amount of wet sludge byproducts are often generated. If this wet sludge is directly dumped and buried, it will cause certain pollution hazards to the environment and soil. Therefore, it is generally necessary to dry the wet sludge for comprehensive resource utilization. The dried sludge can be used as fuel or auxiliary fuel to recover heat for power generation and other heat source utilization.

[0003] Currently, the common method for sludge drying is to use heat exchangers. This involves placing the wet sludge on the surface of a heat exchanger and using the heat exchange medium inside the heat exchanger for heat exchange. The heat exchange medium can be hot water, natural gas, electricity, etc. However, the heat exchanger method limits the direct contact between the sludge and the heat source medium. The drying effect of the sludge depends on the area and length of the heat exchanger, which results in problems such as high energy consumption and poor heat exchange effect. Utility Model Content

[0004] In view of the above problems, the purpose of this utility model is to provide a sludge fluidized drying device to solve the problems of high energy consumption and poor heat exchange effect in the existing technology of using heat exchangers to dry wet sludge.

[0005] This utility model provides a sludge fluidized bed drying device, including a fluidized heat exchange chamber, a fluidized air box, and a fluidized air conveying mechanism; wherein...

[0006] A wet sludge inlet is provided on the lower side wall of the fluidized heat exchange chamber, a dried sludge dust outlet is provided on the top of the fluidized heat exchange chamber, and a hot flue gas inlet is provided on the side wall of the fluidized heat exchange chamber.

[0007] The fluidizing air box is horizontally arranged below the bottom plate of the fluidizing heat exchange chamber; a fluidizing air inlet is provided at one end of the fluidizing air box; a fluidizing air inlet flue reducer is connected to the fluidizing air inlet, and the smaller end of the fluidizing air inlet flue reducer is connected to the fluidizing air inlet.

[0008] The fluidizing air conveying mechanism includes a plurality of fluidizing air guide pipes evenly distributed on the top plate of the fluidizing air box and a fluidizing air cap disposed at the top air outlet of the fluidizing air guide pipe; the bottom air inlet of the fluidizing air guide pipe is disposed inside the fluidizing air box; the top air outlet of the fluidizing air guide pipe is disposed above the bottom plate of the fluidizing heat exchange chamber.

[0009] A number of air holes are evenly distributed along the circumference on the fluidizing air cap; the openings of the air holes are inclined downwards.

[0010] In addition, a preferred embodiment is to connect a dust collector to the dust outlet of the dried sludge.

[0011] Furthermore, a preferred embodiment is to connect a wet sludge screw conveyor to the wet sludge inlet.

[0012] In addition, a preferred embodiment is to provide an air box discharge port in the middle of the bottom plate of the fluidizing air box.

[0013] In addition, a preferred embodiment is to provide a fluidized air inlet flange at the larger end of the fluidized air inlet flue.

[0014] Furthermore, a preferred embodiment is that the smaller end of the fluidizing air inlet flue is welded to the fluidizing air inlet.

[0015] In addition, a preferred embodiment is that the air vents are arranged in at least two layers along the vertical direction of the fluidizing air cap, with at least two air vents in each layer.

[0016] Furthermore, a preferred embodiment is that the included angle between adjacent air holes is 30° along the circumferential direction of the fluidizing air cap.

[0017] Furthermore, a preferred embodiment is that the opening of the air vent is tilted downwards at 5°; and the diameter of the air vent is 5mm.

[0018] Furthermore, in a preferred embodiment, the fluidizing air guide pipe is welded and fixed to the top plate of the fluidizing air box.

[0019] As can be seen from the above technical solution, the sludge fluidized bed dryer provided by this utility model, through the structural design of a fluidized heat exchange chamber, a fluidized air box, and a fluidized air conveying mechanism, utilizes the fluidized air conveying mechanism to send the high-pressure fluidized air introduced from the fluidized air box into the fluidized heat exchange chamber. Furthermore, several air holes evenly distributed along the circumference on the fluidized air cap blow the wet sludge on the bottom plate inside the fluidized heat exchange chamber into a floating state. Then, the hot flue gas entering through the hot flue gas inlet of the fluidized heat exchange chamber undergoes intense heat exchange with the suspended wet sludge particles, thereby causing the suspended sludge to float. The floating wet sludge particles rapidly decompose into dried sludge dust. Under the action of high-pressure fluidizing air at the bottom of the fluidized heat exchange chamber, the dried sludge dust is sent out from the dried sludge dust outlet of the fluidized heat exchange chamber. The hot flue gas directly contacts the suspended fluidized wet sludge particles, causing the wet sludge to rapidly decompose into dried sludge dust after intense heat exchange. The sludge drying treatment effect is good and the energy consumption is low. The special structural design of several downward-sloping air holes on the fluidizing air cap can effectively prevent the wet sludge from being blocked by wet sludge while fluidizing it. Attached Figure Description

[0020] Other objects and results of this invention will become more apparent and readily understood with reference to the following description taken in conjunction with the accompanying drawings, and with a more complete understanding of the invention. In the drawings:

[0021] Figure 1 This is a schematic diagram of the sludge fluidized bed drying device according to an embodiment of the present utility model;

[0022] Figure 2 This is a top view of the fluidizing air box and the fluidizing air conveying mechanism according to an embodiment of the present utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the fluidizing air cap according to an embodiment of the present utility model;

[0024] Figure 4 for Figure 3 A schematic diagram of the AA-direction structure;

[0025] Figure 5 This is a schematic diagram of the structure of the fluidizing air guide pipe according to an embodiment of the present utility model;

[0026] Figure 6 This is a flowchart illustrating the fluidized bed drying process for wet sludge using the fluidized bed drying apparatus of this utility model embodiment.

[0027] In the attached diagram, 1-fluidized heat exchange chamber, 11-wet sludge inlet, 12-dried sludge dust outlet, 13-hot flue gas inlet, 2-fluidized air box, 21-fluidized air inlet, 22-fluidized air inlet flue reducer, 23-air box outlet, 24-fluidized air inlet flange, 31-fluidized air guide pipe, 32-fluidized air cap, 321-air hole, 3211-upper air hole, 3212-lower air hole.

[0028] In all the accompanying drawings, the same reference numerals indicate similar or corresponding features or functions. Detailed Implementation

[0029] In the following description, numerous specific details are set forth for illustrative purposes and to provide a thorough understanding of one or more embodiments. However, it will be apparent that these embodiments may also be implemented without these specific details.

[0030] In view of the problems of high energy consumption and poor heat exchange effect in the existing technology of using heat exchangers to dry wet sludge, a sludge fluidized drying device is proposed.

[0031] The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0032] To illustrate the sludge fluidized bed drying device provided by this utility model Figure 1The structure of a sludge fluidized bed dryer according to an embodiment of the present invention is shown; Figure 2 The top view of the fluidizing air box and the fluidizing air conveying mechanism according to an embodiment of the present invention is shown; Figure 3 The structure of the fluidizing air cap according to an embodiment of the present invention is shown; Figure 4 It shows Figure 3 AA-shaped structure; Figure 5 The structure of the fluidizing air guide pipe according to an embodiment of the present invention is shown; Figure 6 The process of fluidizing and drying wet sludge using a sludge fluidized dryer according to an embodiment of the present invention is shown.

[0033] like Figures 1 to 5 As shown in the figure, the sludge fluidized bed drying device provided by this utility model includes a fluidized heat exchange chamber 1, a fluidized air box 2, and a fluidized air conveying mechanism; wherein,

[0034] A wet sludge inlet 11 is provided on the lower side wall of the fluidized heat exchange chamber 1, a dried sludge dust outlet 12 is provided on the top of the fluidized heat exchange chamber 1, and a hot flue gas inlet 13 is provided on the side wall of the fluidized heat exchange chamber 1.

[0035] The fluidizing air box 2 is horizontally installed below the bottom plate of the fluidizing heat exchange chamber 1; a fluidizing air inlet 21 is provided at one end of the fluidizing air box 2;

[0036] The fluidizing air conveying mechanism includes several fluidizing air guide pipes 31 evenly distributed on the top plate of the fluidizing air box 2 and a fluidizing air cap 32 set at the top air outlet of the fluidizing air guide pipe 31; the bottom air inlet of the fluidizing air guide pipe 31 is set inside the fluidizing air box 2; the top air outlet of the fluidizing air guide pipe 31 is set above the bottom plate of the fluidizing heat exchange chamber 1.

[0037] A number of air holes 321 are evenly distributed along the circumference on the fluidizing air cap 32; the openings of the air holes 321 are inclined downwards.

[0038] Through the structural design of the fluidized heat exchange chamber 1, the fluidized air box 2, and the fluidized air conveying mechanism, the high-pressure fluidized air introduced from the fluidized air box 2 is sent into the fluidized heat exchange chamber 1 by the fluidized air conveying mechanism. Several air holes 321 evenly distributed along the circumference on the fluidized air cap 32 blow the wet sludge on the bottom plate inside the fluidized heat exchange chamber 1 into a floating state. Then, the hot flue gas entering through the hot flue gas inlet 13 of the fluidized heat exchange chamber 1 undergoes intense heat exchange with the suspended wet sludge particles, thereby rapidly breaking down the suspended wet sludge particles. The dried sludge dust is formed. Under the action of high-pressure fluidizing air at the bottom of the fluidizing heat exchange chamber 1, the dried sludge dust is sent out from the dried sludge dust outlet 12 of the fluidizing heat exchange chamber 1. The hot flue gas directly contacts the wet sludge particles in the suspended fluidized state, so that the wet sludge is rapidly decomposed into dried sludge dust after intense heat exchange. The sludge drying treatment effect is good and the energy consumption is low. The special structural design of several air holes 321 on the fluidizing air cap 32 tilting downwards can effectively prevent the wet sludge from being blocked by the wet sludge while playing a fluidizing role.

[0039] As a preferred embodiment of this utility model, a dust collector is connected to the dust outlet 12 of the dried sludge.

[0040] Specifically, by connecting a dust collector to the dried sludge dust outlet 12, the dust generated after the sludge in the fluidized heat exchange chamber 1 is quickly discharged from the dried sludge dust outlet 12. The dust can then be further collected by a dust collection device, allowing it to be used as fuel or auxiliary fuel for subsequent heat energy collection and reuse. The preferred location of the dried sludge dust outlet 12 is the middle of the top of the fluidized heat exchange chamber 1, and to avoid dust accumulation on the inner wall of the fluidized heat exchange chamber 1, its inner wall can be made into a smooth curved surface.

[0041] As a preferred embodiment of this utility model, a wet sludge screw conveyor is connected to the wet sludge inlet 11.

[0042] Specifically, the wet sludge inlet 11 is fed into the floor inside the fluidized heat exchange chamber 1 through the wet sludge screw conveyor, so that the wet sludge is dried inside the fluidized heat exchange chamber 1.

[0043] As a preferred embodiment of this utility model, at least two hot flue gas inlets 13 are tangentially arranged on the inner sidewall of the fluidized heat exchange chamber 1, so that the fluidized suspended wet sludge particles can fully contact the hot flue gas to dry and decompose into dust. The number of hot flue gas inlets 13 and their height on the sidewall of the fluidized heat exchange chamber 1 can be set according to actual needs, and this utility model does not impose any particular limitation on them.

[0044] As a preferred embodiment of this utility model, a flue gas outlet 23 is provided in the middle of the bottom plate of the fluidizing box 2.

[0045] Specifically, during actual operation, a very small amount of dry sludge particles will return to the fluidizing air box 2 through the air hole 321. The purpose of setting the air box exhaust port 23 in the middle of the floor of the fluidizing air box 2 is to periodically discharge this dust.

[0046] As a preferred embodiment of this utility model, a fluidizing air inlet flange 24 is provided at the fluidizing air inlet 21 of the fluidizing air box 2. A further preferred embodiment is that a fluidizing air inlet flue reducer 22 is connected to the fluidizing air inlet 21, the smaller end of the fluidizing air inlet flue reducer 22 is connected to the fluidizing air inlet 21, and a fluidizing air inlet flange 24 is provided at the larger end of the fluidizing air inlet flue reducer 22.

[0047] Specifically, by connecting the fluidizing air inlet flue reducer 22 to the fluidizing air inlet 21, high-pressure fluidizing air can enter the fluidizing air box 2 from the fluidizing air inlet 21. The fluidizing air inlet 21 end of the fluidizing air box 2 is connected to the fluidizing air generating device through the fluidizing air inlet flange 24 to ensure that the high-pressure fluidizing air enters the fluidizing air box 2 smoothly.

[0048] As a preferred embodiment of this utility model, the smaller end of the fluidizing air inlet flue reducer 22 is welded to the fluidizing air inlet 21, making the connection between the two more secure.

[0049] As a preferred embodiment of this utility model, the fluidizing air guide pipe 31 is welded and fixed to the top plate of the fluidizing air box 2. This makes the fluidizing air guide pipe 31 more firmly fixed on the fluidizing air box 2, facilitating the delivery of high-pressure fluidizing air.

[0050] As a preferred embodiment of this utility model, the air vents 321 are arranged in at least two layers along the vertical direction of the fluidizing air cap 32, with at least two air vents in each layer.

[0051] Specifically, the number of layers of air vents 321 can be set according to actual needs, and this utility model does not impose any particular limitation on this. Taking two layers of air vents as an example, such as... Figure 3 and Figure 4 As shown, along the vertical direction of the fluidizing air cap 32, the air holes 321 are arranged in two layers: an upper layer of air holes 3211 and a lower layer of air holes 3212. Each layer has six air holes, for a total of twelve air holes. Both the upper layer air holes 3211 and the lower layer air holes 3212 are evenly arranged along the circumference of the fluidizing air cap 32, ensuring better fluidization of the wet sludge on the bottom plate of the fluidized heat exchange chamber 1 by the fluidizing air coming out of the air holes 321.

[0052] As a preferred embodiment of this utility model, the included angle between adjacent air holes 321 along the circumferential direction of the fluidizing air cap 32 is 30°.

[0053] It should be noted that: along the circumferential direction of the fluidizing air cap 32, the included angle between adjacent air holes 321 is preferably, but not limited to, 30°. The included angle between adjacent air holes 321 can be set according to actual needs. This utility model does not make any special limitation in this regard. Furthermore, the number and layers of air holes 321 can be determined according to actual conditions. This utility model does not make any special limitation in this regard either.

[0054] As a preferred embodiment of this utility model, the opening of the air hole 321 is tilted downward at 5°; the diameter of the air hole 321 is 5mm.

[0055] Specifically, according to actual trial verification, the fluidization effect of the sludge is best when the orifice of the air hole 321 is tilted downward at 5° and the orifice diameter of the air hole 321 is 5mm. However, it should be noted that the downward tilt angle of the orifice of the air hole 321 and the orifice diameter of the air hole 321 in the technical solution of this utility model can be set according to actual needs, and this utility model does not make any special limitation on this.

[0056] like Figure 6 As shown, the fluidized bed drying device of this invention, as described above, is used to perform fluidized bed drying on wet sludge, including the following steps:

[0057] Step S1: Feed wet sludge into the fluidized heat exchange chamber 1 through wet sludge inlet 11 and let the wet sludge fall onto the bottom plate of the fluidized heat exchange chamber 1.

[0058] Step S2: High-pressure fluidizing air enters the fluidizing air box 2 through the fluidizing air inlet 21. The high-pressure fluidizing air in the fluidizing air box 2 is evenly distributed to the fluidizing air guide pipe 31. The high-pressure fluidizing air inside the fluidizing air guide pipe 31 is blown onto the wet sludge on the bottom plate of the fluidizing heat exchange chamber 1 through the air hole 321 on the fluidizing air cap 32, and the wet sludge is blown up and suspended.

[0059] Step S3: Hot flue gas is introduced into the fluidized heat exchange chamber 1 through hot flue gas inlet 13, and it exchanges heat violently with the wet sludge particles that are in a suspended state in the fluidized heat exchange chamber 1, so that the wet sludge particles in a floating state are rapidly decomposed to form dried sludge dust.

[0060] Step S4: The dried sludge dust inside the fluidized heat exchange chamber 1 is sent out from the dried sludge dust outlet 12 under the action of the high-pressure fluidizing air at the bottom, so as to complete the fluidized drying treatment of the wet sludge.

[0061] As can be seen from the above specific embodiments, the sludge fluidized bed drying device provided by this utility model, through the structural design of a fluidized heat exchange chamber, a fluidized air box, and a fluidized air conveying mechanism, utilizes the fluidized air conveying mechanism to send high-pressure fluidized air introduced from the fluidized air box into the fluidized heat exchange chamber. Furthermore, several air holes evenly distributed along the circumference on the fluidized air cap blow the wet sludge on the bottom plate inside the fluidized heat exchange chamber into a floating state. Then, the hot flue gas entering through the hot flue gas inlet of the fluidized heat exchange chamber undergoes intense heat exchange with the suspended wet sludge particles, thereby... The process rapidly decomposes suspended wet sludge particles into dried sludge dust. Under the action of high-pressure fluidizing air at the bottom of the fluidized heat exchange chamber, the dried sludge dust is sent out through the dried sludge dust outlet of the fluidized heat exchange chamber. The hot flue gas directly contacts the suspended fluidized wet sludge particles, causing the wet sludge to rapidly decompose into dried sludge dust after intense heat exchange. The sludge drying treatment effect is good and the energy consumption is low. The special structural design of several downward-sloping air holes on the fluidizing air cap not only fluidizes the wet sludge but also effectively prevents it from being blocked by the wet sludge.

[0062] The sludge fluidized bed dryer according to the present invention has been described above by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various modifications can be made to the sludge fluidized bed dryer proposed in the present invention without departing from the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the contents of the appended claims.

Claims

1. A sludge fluidized bed drying device, characterized in that, It includes a fluidized heat exchange chamber, a fluidized air box, and a fluidized air delivery mechanism; among which, A wet sludge inlet is provided on the lower side wall of the fluidized heat exchange chamber, a dried sludge dust outlet is provided on the top of the fluidized heat exchange chamber, and a hot flue gas inlet is provided on the side wall of the fluidized heat exchange chamber. The fluidizing air box is horizontally arranged below the bottom plate of the fluidizing heat exchange chamber; a fluidizing air inlet is provided at one end of the fluidizing air box; a fluidizing air inlet flue reducer is connected to the fluidizing air inlet, and the smaller end of the fluidizing air inlet flue reducer is connected to the fluidizing air inlet. The fluidizing air conveying mechanism includes a plurality of fluidizing air guide pipes evenly distributed on the top plate of the fluidizing air box and a fluidizing air cap disposed at the top air outlet of the fluidizing air guide pipe; the bottom air inlet of the fluidizing air guide pipe is disposed inside the fluidizing air box; the top air outlet of the fluidizing air guide pipe is disposed above the bottom plate of the fluidizing heat exchange chamber. A number of air holes are evenly distributed along the circumference on the fluidizing air cap; the openings of the air holes are inclined downwards.

2. The sludge fluidized bed dryer according to claim 1, characterized in that, A dust collector is connected to the dust outlet of the dried sludge.

3. The sludge fluidized bed dryer according to claim 1, characterized in that, A wet sludge screw conveyor is connected to the wet sludge inlet.

4. The sludge fluidized bed dryer according to claim 1, characterized in that, An air box discharge port is provided in the middle of the bottom plate of the fluidizing air box.

5. The sludge fluidized bed dryer according to claim 1, characterized in that, A fluidized air inlet flange is provided at the larger end of the fluidized air inlet flue.

6. The sludge fluidized bed dryer according to claim 1, characterized in that, The smaller end of the fluidizing air inlet flue is welded to the fluidizing air inlet.

7. The sludge fluidized bed dryer according to claim 1, characterized in that, The air vents are arranged in at least two layers along the vertical direction of the fluidizing air cap, with at least two air vents in each layer.

8. The sludge fluidized bed dryer according to claim 7, characterized in that, Along the circumferential direction of the fluidizing air cap, the included angle between adjacent air holes is 30°.

9. The sludge fluidized bed dryer according to claim 1, characterized in that, The opening of the air vent is tilted downwards at 5°. The diameter of the air vent is 5mm.

10. The sludge fluidized bed dryer according to claim 1, characterized in that, The fluidizing air guide pipe is welded and fixed to the top plate of the fluidizing air box.

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