Sludge fluidized drying device and method

Abstract

The invention provides a sludge fluidized drying device and method, and belongs to the technical field of sludge drying treatment.The device comprises a fluidized heat exchange chamber, a fluidized air bellow and a fluidized 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 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 can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge drying treatment, and more specifically, to a sludge fluidized drying device and method. Background Art

[0002] In the process of sewage treatment, a large amount of wet sludge by-product is often produced. 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 heat source utilization such as power generation.

[0003] At present, the general method of sludge drying is to use a heat exchanger for drying, that is, placing the wet sludge on the surface of the 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. The heat exchange method of the heat exchanger limits the direct contact between the sludge and the heat source medium. The sludge drying effect depends on the area and length of the heat exchanger, which results in high energy consumption and poor heat exchange effect. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a sludge fluidized drying device and method to solve the problems of high energy consumption and poor heat exchange effect in the prior art method of using a heat exchanger to dry wet sludge.

[0005] The present invention provides a sludge fluidized drying device, comprising a fluidized heat exchange chamber, a fluidized wind box and a fluidized wind 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 wind box is horizontally arranged at the lower part of the bottom plate of the fluidizing heat exchange chamber; a fluidizing wind inlet is arranged at one end of the fluidizing wind box;

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

[0009] A plurality of air holes are evenly distributed along the circumferential direction on the fluidized air hood; the openings of the air holes are tilted downward.

[0010] In addition, a preferred solution is that a dust collector is connected to the dried sludge dust outlet.

[0011] In addition, a preferred solution is that a wet sludge spiral conveying device is connected to the wet sludge inlet.

[0012] In addition, a preferred solution is that a wind box discharge port is opened in the middle of the bottom plate of the fluidizing wind box.

[0013] In addition, a preferred solution is that a fluidizing air inlet flange is provided at the fluidizing air inlet of the fluidizing air box.

[0014] In addition, a preferred solution is that the fluidizing air guide pipe is welded and fixed on the top plate of the fluidizing air box.

[0015] In addition, a preferred solution is that the air holes are arranged in at least two layers along the vertical direction of the fluidizing air hood, and each layer is provided with at least two air holes.

[0016] In addition, a preferred solution is that, along the circumferential direction of the fluidizing air hood, the angle between adjacent air holes is 30°.

[0017] In addition, a preferred solution is that the opening of the air hole is inclined downward by 5°; and the aperture of the air hole is 5 mm.

[0018] The present invention provides a sludge fluidized drying method, which uses the sludge fluidized drying device as described above to perform fluidized drying treatment on wet sludge, comprising the following steps:

[0019] Step S1, delivering wet sludge into the interior of the fluidized heat exchange chamber through the wet sludge inlet, and allowing the wet sludge to fall on the bottom plate of the fluidized heat exchange chamber;

[0020] Step S2, allowing high-pressure fluidizing air to enter the fluidizing air box through the fluidizing air inlet, the high-pressure fluidizing air in the fluidizing air box is evenly distributed to the fluidizing air guide pipe, and the high-pressure fluidizing air in the fluidizing air guide pipe is blown toward the wet sludge on the bottom plate of the fluidizing heat exchange chamber through the air holes on the fluidizing air cap, and the wet sludge is blown up into a suspended state;

[0021] Step S3, passing the hot flue gas into the fluidized heat exchange chamber from the hot flue gas inlet, and intensely exchanging heat with the wet sludge particles in suspension in the fluidized heat exchange chamber, so that the wet sludge particles in suspension are rapidly cracked to form dried sludge dust;

[0022] Step S4: The dried sludge dust inside the fluidized heat exchange chamber is sent out from the dried sludge dust outlet under the action of the high-pressure fluidized air at the bottom to complete the fluidized drying treatment of the wet sludge.

[0023] It can be seen from the above technical scheme that the sludge fluidized drying device and method provided by the present invention, through the structural design of the fluidized heat exchange chamber, the fluidized air box and the fluidized air conveying mechanism, uses the fluidized air conveying mechanism to send the high-pressure fluidized air introduced into the fluidized air box into the fluidized heat exchange chamber, and uses a plurality of air holes evenly arranged along the circumferential direction on the fluidized air hood to blow up the wet sludge on the bottom plate inside the fluidized heat exchange chamber into a floating state, and then the hot flue gas entering from the hot flue gas inlet of the fluidized heat exchange chamber and the particles of the suspended wet sludge are intensely exchanged with each other, so that The suspended wet sludge particles are rapidly decomposed to form dried sludge dust, which is sent out from the dried sludge dust outlet of the fluidized heat exchange chamber under the action of the high-pressure fluidized air at the bottom of the fluidized heat exchange chamber. The hot flue gas is directly in contact with 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 effect is good and the energy consumption is low. The special structural design of the downward-inclined air holes on the fluidized air hood can not only fluidize the wet sludge, but also effectively avoid being blocked by the wet sludge.

[0024] In order to achieve the above and related purposes, one or more aspects of the present invention include the features that will be described in detail later. The following description and the accompanying drawings describe some exemplary aspects of the present invention in detail. However, these aspects indicate only some of the various ways in which the principles of the present invention can be used. In addition, the present invention is intended to include all these aspects and their equivalents. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more apparent and easy to understand. In the accompanying drawings:

[0026] Figure 1 It is a structural schematic diagram of a sludge fluidized drying device according to an embodiment of the present invention;

[0027] Figure 2 A top view of a fluidizing air box and a fluidizing air conveying mechanism according to an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of a fluidizing air hood according to an embodiment of the present invention;

[0029] Figure 4 for Figure 3 AA structural diagram;

[0030] Figure 5 is a schematic structural diagram of a fluidized air guide tube according to an embodiment of the present invention;

[0031] Figure 6 The figure is a flow chart of a sludge fluidized drying method according to an embodiment of the present invention.

[0032] In the attached drawings, 1- fluidized heat exchange chamber, 11- wet sludge inlet, 12- dried sludge dust outlet, 13- hot flue gas inlet, 2- fluidized bellows, 21- fluidized air inlet, 22- fluidized air inlet flue head, 23- bellows discharge port, 24- fluidized air inlet flange, 31- fluidized air guide duct, 32- fluidized air hood, 321- air hole, 3211- upper air hole, 3212- lower air hole.

[0033] The same reference numerals throughout the drawings indicate similar or corresponding features or functions. DETAILED DESCRIPTION

[0034] In the following description, for the purpose of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments. However, it is apparent that these embodiments may also be implemented without these specific details.

[0035] In view of the problems of high energy consumption and poor heat exchange effect in the above-mentioned prior art method of using a heat exchanger to dry wet sludge, a sludge fluidized drying device and method are proposed.

[0036] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] In order to illustrate the sludge fluidized drying device and method provided by the present invention, Figure 1 The structure of the sludge fluidization drying device according to an embodiment of the present invention is shown; Figure 2 The top view structure 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 hood according to an embodiment of the present invention is shown; Figure 4 Shows Figure 3 AA-oriented structure; Figure 5 The structure of the fluidized wind guide tube according to an embodiment of the present invention is shown; Figure 6 The flowchart of the sludge fluidized drying method according to an embodiment of the present invention is shown.

[0038] like Figures 1 to 5 As shown together, the sludge fluidized drying device provided by the present invention comprises a fluidized heat exchange chamber 1, a fluidized wind box 2 and a fluidized wind conveying mechanism; wherein,

[0039] 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;

[0040] The fluidizing wind box 2 is horizontally arranged at the bottom of the bottom plate of the fluidizing heat exchange chamber 1; a fluidizing wind inlet 21 is arranged at one end of the fluidizing wind box 2;

[0041] The fluidizing air conveying mechanism includes a plurality of fluidizing air guide pipes 31 evenly arranged on the top plate of the fluidizing air box 2 and a fluidizing air cap 32 arranged at the top air outlet of the fluidizing air guide pipe 31; the bottom air inlet of the fluidizing air guide pipe 31 is arranged inside the fluidizing air box 2; the top air outlet of the fluidizing air guide pipe 31 is arranged above the bottom plate of the fluidizing heat exchange chamber 1;

[0042] A plurality of air holes 321 are evenly arranged along the circumferential direction on the fluidizing air cap 32; the openings of the air holes 321 are arranged to be inclined downward.

[0043] 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 into the fluidized air box 2 is conveyed into the fluidized heat exchange chamber 1 by the fluidized air conveying mechanism, and the wet sludge on the bottom plate of the fluidized heat exchange chamber 1 is blown up into a floating state by a plurality of air holes 321 evenly arranged along the circumferential direction on the fluidized air cap 32, and then the hot flue gas entering from the hot flue gas inlet 13 of the fluidized heat exchange chamber 1 exchanges heat violently with the suspended wet sludge particles, so that the suspended wet sludge particles are rapidly cracked. , forming dried sludge dust, which is sent out from the dried sludge dust outlet 12 of the fluidized heat exchange chamber 1 under the action of the high-pressure fluidizing air at the bottom of the fluidized heat exchange chamber 1, and the hot flue gas is directly in contact with the wet sludge particles in the suspended fluidized state, so that the wet sludge is rapidly cracked into dried sludge dust after intense heat exchange, and the sludge drying effect is good with low energy consumption; the special structural design of the downward-inclined several air holes 321 on the fluidized air hood 32 can effectively avoid being blocked by the wet sludge while playing a role in fluidizing the wet sludge.

[0044] As a preferred solution of the present invention, a dust collector is connected to the dried sludge dust outlet 12 .

[0045] Specifically, by connecting a dust collector to the drying sludge dust outlet 12, the dust generated after the sludge in the fluidized heat exchange chamber 1 is dried is quickly sent out from the drying sludge dust outlet 12, and the dust in the dust collector can be further collected by a dust collection device, so that the dust can be used as fuel or auxiliary fuel in the future to realize heat collection and reuse. The preferred position of the drying sludge dust outlet 12 is the middle of the top of the fluidized heat exchange chamber 1, and in order to avoid the problem of dust accumulation on the inner wall of the fluidized heat exchange chamber 1, its inner wall can be set to a smooth curved surface.

[0046] As a preferred solution of the present invention, the wet sludge inlet 11 is connected to a wet sludge spiral conveying device.

[0047] Specifically, the wet sludge inlet 11 is delivered to the floor inside the fluidized heat exchange chamber 1 by the wet sludge spiral delivery device, so that the wet sludge is dried in the fluidized heat exchange chamber 1 .

[0048] As a preferred solution of the present invention, at least two hot flue gas inlets 13 are tangentially arranged on the inner side wall of the fluidized heat exchange chamber 1, so that the fluidized suspended wet sludge particles are fully contacted with the hot flue gas to be dried and cracked into dust. The number of the hot flue gas inlets 13 and the height of the hot flue gas inlets 13 on the side wall of the fluidized heat exchange chamber 1 can be set according to actual needs, and the present invention does not specifically limit this.

[0049] As a preferred solution of the present invention, a wind box discharge port 23 is opened in the middle of the bottom plate of the fluidizing wind box 2.

[0050] Specifically, in the actual operation process, very few dry sludge particles will return to the fluidizing bellows 2 along the wind holes 321. The purpose of providing the bellows discharge port 23 in the middle of the bottom plate of the fluidizing bellows 2 is to discharge these dusts regularly.

[0051] As a preferred embodiment of the present invention, 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 size header 22 is connected to the fluidizing air inlet 21, the small end of the fluidizing air inlet flue size header 22 is butted against the fluidizing air inlet 21, and a fluidizing air inlet flange 24 is provided at the large end of the fluidizing air inlet flue size header 22.

[0052] Specifically, by connecting the fluidizing air inlet 21 to the fluidizing air inlet flue reducer 22, high-pressure fluidizing air can be facilitated to enter the interior of 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 can smoothly enter the fluidizing air box 2.

[0053] As a preferred solution of the present invention, the small end of the fluidizing air inlet flue reducer 22 is welded to the fluidizing air inlet 21, so that the connection between the two is more firm.

[0054] As a preferred solution of the present invention, the fluidizing air guide pipe 31 is welded and fixed on the top plate of the fluidizing air box 2. The fluidizing air guide pipe 31 is fixed on the fluidizing air box 2 more firmly, which is convenient for conveying high-pressure fluidizing air.

[0055] As a preferred solution of the present invention, the air holes 321 are arranged in at least two layers along the vertical direction of the fluidizing air hood 32, and each layer is provided with at least two air holes.

[0056] Specifically, the number of layers of the air holes 321 can be set according to actual needs, and the present invention does not specifically limit this. Figure 3 and Figure 4As shown, along the vertical direction of the fluidizing air cap 32, the air holes 321 are arranged in two layers, namely, upper air holes 3211 and lower air holes 3212. There are six air holes in each layer, for a total of twelve air holes. The upper air holes 3211 and the lower air holes 3212 are evenly arranged along the circumferential direction of the fluidizing air cap 32, so that the fluidizing air from the air holes 321 has a better fluidization effect on the wet sludge on the bottom plate of the fluidized heat exchange chamber 1.

[0057] As a preferred solution of the present invention, along the circumferential direction of the fluidizing air hood 32, the angle between adjacent air holes 321 is 30°.

[0058] It should be noted that: along the circumferential direction of the fluidizing air hood 32, the angle between adjacent air holes 321 is preferably but not limited to 30°, and the angle between adjacent air holes 321 can be set according to actual needs, and the present invention does not make any special limitations on this. The number and number of layers of the air holes 321 can be determined according to actual conditions, and the present invention does not make any special limitations on this.

[0059] As a preferred solution of the present invention, the opening of the air hole 321 is inclined downward by 5°; the aperture of the air hole 321 is 5 mm.

[0060] Specifically, according to actual trial verification, when the opening of the air hole 321 is tilted downward by 5° and the aperture of the air hole 321 is 5 mm, the fluidization effect on the sludge is optimal. However, it should be noted that in the technical solution of the present invention, the downward tilt angle of the opening of the air hole 321 and the aperture of the air hole 321 can be set according to actual needs, and the present invention does not make any special limitation on this.

[0061] like Figure 6 As shown, the sludge fluidized drying method provided by the present invention uses the sludge fluidized drying device as described above to perform fluidized drying treatment on wet sludge, comprising the following steps:

[0062] Step S1, feeding wet sludge into the fluidized heat exchange chamber 1 through the wet sludge inlet 11, and making the wet sludge fall on the bottom plate of the fluidized heat exchange chamber 1;

[0063] Step S2, high-pressure fluidizing air enters the fluidizing air box 2 through the fluidizing air inlet 21, and 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 in the fluidizing air guide pipe 31 is blown toward the wet sludge on the bottom plate of the fluidizing heat exchange chamber 1 through the air holes 321 on the fluidizing air cap 32, and the wet sludge is blown up into a suspended state;

[0064] Step S3, passing the hot flue gas into the fluidized heat exchange chamber 1 through the hot flue gas inlet 13, and intensely exchanging heat with the wet sludge particles in suspension in the fluidized heat exchange chamber 1, so that the wet sludge particles in suspension are rapidly cracked to form dried sludge dust;

[0065] 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 fluidized air at the bottom to complete the fluidized drying treatment of the wet sludge.

[0066] It can be seen from the above specific embodiments that the sludge fluidized drying device and method provided by the present invention, through the structural design of the fluidized heat exchange chamber, the fluidized air box and the fluidized air conveying mechanism, uses the fluidized air conveying mechanism to convey the high-pressure fluidized air introduced into the fluidized air box into the fluidized heat exchange chamber, and uses a plurality of air holes evenly arranged along the circumferential direction on the fluidized air hood to blow up the wet sludge on the bottom plate inside the fluidized heat exchange chamber into a floating state, and then the hot flue gas entering from the hot flue gas inlet of the fluidized heat exchange chamber and the particles of the suspended wet sludge are violently exchanged with each other, thereby The suspended wet sludge particles are rapidly decomposed to form dried sludge dust. The dried sludge dust is sent out from the dried sludge dust outlet of the fluidized heat exchange chamber under the action of the high-pressure fluidized air at the bottom of the fluidized heat exchange chamber. The hot flue gas is directly in contact with 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 effect is good and the energy consumption is low. The special structural design of the downward-inclined air holes on the fluidized air hood can not only fluidize the wet sludge, but also effectively avoid being blocked by the wet sludge.

[0067] As described above, the sludge fluidized drying device and method proposed in accordance with the present invention are described by way of example with reference to the accompanying drawings. However, those skilled in the art should understand that various improvements can be made to the sludge fluidized drying device and method proposed in accordance with the present invention without departing from the content of the present invention. Therefore, the protection scope of the present invention should be determined by the content of the attached claims.

Claims

1. A sludge fluidized drying device, characterized in that: It includes a fluidized heat exchange chamber, a fluidized wind box and a fluidized wind conveying mechanism; wherein, 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 wind box is horizontally arranged at the lower part of the bottom plate of the fluidizing heat exchange chamber; a fluidizing wind inlet is arranged at one end of the fluidizing wind box; The fluidizing air conveying mechanism includes a plurality of fluidizing air guide pipes evenly arranged on the top plate of the fluidizing air box and a fluidizing air cap arranged at the top air outlet of the fluidizing air guide pipe; the bottom air inlet of the fluidizing air guide pipe is arranged inside the fluidizing air box; the top air outlet of the fluidizing air guide pipe is arranged above the bottom plate of the fluidizing heat exchange chamber; A plurality of air holes are evenly distributed along the circumferential direction on the fluidized air hood; the openings of the air holes are tilted downward.

2. The sludge fluidized bed drying device according to claim 1, characterized in that: The dried sludge dust outlet is connected with a dust collector.

3. The sludge fluidized bed drying device according to claim 1, characterized in that: The wet sludge inlet is connected with a wet sludge spiral conveying device.

4. The sludge fluidized bed drying device according to claim 1, characterized in that: A wind box discharge port is provided in the middle of the bottom plate of the fluidizing wind box.

5. The sludge fluidized bed drying device according to claim 1, characterized in that: A fluidizing air inlet flange is arranged at the fluidizing air inlet of the fluidizing air box.

6. The sludge fluidized bed drying device according to claim 1, characterized in that: The fluidizing air guide pipe is welded and fixed on the top plate of the fluidizing air box.

7. The sludge fluidized bed drying device according to claim 1, characterized in that: The air holes are arranged in at least two layers along the vertical direction of the fluidizing air hood, and each layer is provided with at least two air holes.

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

9. The sludge fluidized bed drying device according to claim 1, characterized in that: The opening of the air hole is inclined downward by 5°; The diameter of the air hole is 5 mm.

10. A sludge fluidized bed drying method, characterized in that: The sludge fluidized drying device according to any one of claims 1 to 9 is used to perform fluidized drying treatment on wet sludge, comprising the following steps: Step S1, delivering wet sludge into the interior of the fluidized heat exchange chamber through the wet sludge inlet, and allowing the wet sludge to fall on the bottom plate of the fluidized heat exchange chamber; Step S2, allowing high-pressure fluidizing air to enter the fluidizing air box through the fluidizing air inlet, the high-pressure fluidizing air in the fluidizing air box is evenly distributed to the fluidizing air guide pipe, and the high-pressure fluidizing air in the fluidizing air guide pipe is blown toward the wet sludge on the bottom plate of the fluidizing heat exchange chamber through the air holes on the fluidizing air cap, and the wet sludge is blown up into a suspended state; Step S3, passing the hot flue gas into the fluidized heat exchange chamber from the hot flue gas inlet, and intensely exchanging heat with the wet sludge particles in suspension in the fluidized heat exchange chamber, so that the wet sludge particles in suspension are rapidly cracked to form dried sludge dust; Step S4: The dried sludge dust inside the fluidized heat exchange chamber is sent out from the dried sludge dust outlet under the action of the high-pressure fluidized air at the bottom to complete the fluidized drying treatment of the wet sludge.

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