CN110642497A - Solid waste drying device and process - Google Patents
Solid waste drying device and process Download PDFInfo
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- CN110642497A CN110642497A CN201910882695.3A CN201910882695A CN110642497A CN 110642497 A CN110642497 A CN 110642497A CN 201910882695 A CN201910882695 A CN 201910882695A CN 110642497 A CN110642497 A CN 110642497A
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- 239000002910 solid waste Substances 0.000 title claims abstract description 68
- 238000001035 drying Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims description 6
- 239000007788 liquid Substances 0.000 claims abstract description 85
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 238000001704 evaporation Methods 0.000 claims abstract description 11
- 230000008020 evaporation Effects 0.000 claims abstract description 8
- 238000010521 absorption reaction Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims description 14
- 239000010802 sludge Substances 0.000 claims description 13
- 238000003756 stirring Methods 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 8
- 239000007789 gas Substances 0.000 claims description 8
- 238000009833 condensation Methods 0.000 claims description 6
- 230000005494 condensation Effects 0.000 claims description 6
- 239000008187 granular material Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 2
- 238000011084 recovery Methods 0.000 claims description 2
- 239000002918 waste heat Substances 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 3
- 230000018044 dehydration Effects 0.000 description 7
- 238000006297 dehydration reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- 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)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses a solid waste drying device which comprises a solid waste conveying device, a drying cylinder and a steam compressor, wherein the solid waste conveying device is communicated with the drying cylinder. The drying cylinder is sequentially provided with an upper steam area, a heat exchange area, a lower steam area and a hot oil area which are communicated with each other from top to bottom, and a heat exchanger is arranged in the heat exchange area. The heat exchanger is provided with a steam inlet and a condensed water outlet, the inlet of the steam compressor is communicated with the upper steam area or the lower steam area, and the outlet is communicated with the steam inlet of the heat exchanger. The hot oil area is provided with a first liquid outlet and a second liquid outlet, the first liquid outlet is communicated with the upper steam area through an internal circulation pipeline, and the second liquid outlet is communicated with the upper steam area through an external circulation pipeline. The invention also discloses a drying process of the solid waste. The invention can recover most of energy of water evaporation, can obtain dry solid waste with the water content lower than 10 percent, and is more beneficial to combustion disposal after the solid waste is molded.
Description
Technical Field
The invention relates to the technical field of drying devices, in particular to a solid waste drying device and a process.
Background
The dehydration of wet solid waste, particularly municipal sludge, is usually performed by centrifugal dehydration, plate-and-frame filter-press dehydration, belt filter-press dehydration, or the like, and the moisture content of the wet solid waste obtained by centrifugal dehydration, plate-and-frame filter-press dehydration, or belt filter-press dehydration is high, usually 65% to 85%. In order to further reduce the weight and volume of the wet solid waste, the moisture content of the wet solid waste needs to be reduced significantly by adopting a drying mode.
The manner of drying wet solid waste is generally as follows: the hot flue gas directly dries the wet solid waste; or heating the wall to indirectly heat the air of the wet solid waste on the wall, thereby indirectly drying the wet solid waste on the wall. In either way, because the energy required by the direct evaporation of the water is about 2256 kj/kg, the energy consumption is large, most of the energy is not recovered, the unit decrement energy for treating the wet solid waste is about the same as the evaporation energy of unit water amount, and the tail gas with higher temperature is discharged to the atmosphere. The first mode also relates to the treatment of waste flue gas and the treatment of organic tail gas released by high-temperature evaporation of wet biological sludge; a second mode relates to the off-gas treatment of the heated air. The MVR principle can be used to recover most of the energy of water evaporation by making the wet solid waste in a more solid state have the property of a more liquid state.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a solid waste drying device and process with significant energy saving and wastewater recycling, which can recover most of the energy of water evaporation, obtain dry solid waste with a water content of less than 10%, and facilitate combustion disposal after solid waste is formed.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the solid waste drying device comprises a solid waste conveying device, a drying cylinder and a steam compressor, wherein the solid waste conveying device is communicated with the drying cylinder. The drying cylinder is sequentially provided with an upper steam area, a heat exchange area, a lower steam area and a hot oil area which are communicated with one another from top to bottom, and a vertical tube-in-tube heat exchanger is arranged in the heat exchange area. The heat exchanger is provided with a steam inlet and a condensed water outlet, the inlet of the steam compressor is communicated with the upper steam area or the lower steam area, and the outlet is communicated with the steam inlet of the heat exchanger. The hot oil area is provided with a first liquid outlet and a second liquid outlet, the first liquid outlet is communicated with the upper steam area through an internal circulation pipeline, and a first liquid delivery pump is arranged in the middle of the internal circulation pipeline. The second liquid outlet is communicated with the upper steam area through an external circulation pipeline, and a second liquid delivery pump is arranged in the middle of the external circulation pipeline.
Furthermore, the external circulation pipeline comprises a second liquid delivery pump, a pre-heat exchanger, a solid-liquid separation device, an oil container, a third liquid delivery pump and a plurality of pipelines. And the inlet of the second liquid delivery pump is communicated with a second liquid outlet pipeline, the outlet of the second liquid delivery pump is connected to the heat release side inlet of the pre-heat exchanger through a pipeline, and the heat release side outlet of the pre-heat exchanger is communicated with the solid waste separation device pipeline. The solid waste separation device is provided with a solid discharge port and a liquid discharge port, the liquid discharge port is communicated with an oil container pipeline, an outlet of the oil container is connected to an inlet of a third liquid delivery pump, an outlet of the third liquid delivery pump is connected to a heat absorption side inlet of the pre-heat exchanger, and a heat absorption side outlet of the pre-heat exchanger is communicated with the upper steam area through a pipeline.
Furthermore, the lower part of the hot oil area is divided into an upper layer hot oil area and a lower layer hot oil area through a filter screen, the first liquid outlet is communicated with the upper layer hot oil area, and the second liquid outlet is communicated with the lower layer hot oil area. The mesh number of the filter screens is more than or equal to 10.
The upper layer hot oil area is internally provided with a stirring paddle which is beneficial to fully mixing solid waste and hot oil, and the stirring paddle is driven by a stirring motor fixedly arranged outside the drying cylinder.
Further, a sludge outlet of the solid waste conveying device is communicated with a lower steam area of the drying cylinder.
Further, the outlet of the steam compressor is communicated with the second liquid outlet of the drying cylinder through a branch pipeline and is used for stirring up wet and solid waste deposited at the bottom.
Furthermore, the heat exchanger is also provided with a tail gas discharge port for discharging non-condensable gas.
Further, the solid waste is sludge.
Further, the boiling point of the hot oil is 250-380 ℃, and preferably 300-330 ℃.
A solid waste drying process comprises the following steps:
firstly, conveying strip-shaped wet solid wastes to a hot oil area through a solid waste conveying device, and forming granular dry solid wastes by the incoming wet solid wastes under the tearing force of stirring or evaporating water;
secondly, compressing the water vapor generated by evaporation into high-temperature and high-pressure water vapor through a vapor compressor, conveying the water vapor into a heat exchanger through a vapor inlet, releasing condensation heat due to the fact that the water vapor is condensed into condensed water by a pipe wall with lower temperature, transmitting the condensation heat to oil adhered to the inner wall of the heat exchange pipe, and discharging the condensed water through a condensed water discharge port;
thirdly, the cooled oil is conveyed to an upper steam area of the heat exchange tube through a liquid internal circulation pipeline, flows downwards from top to bottom through being attached to the inner wall of the heat exchange tube, the oil temperature is increased due to the absorption of condensation heat in the flowing-down process, and suspended matters in the oil further evaporate the water in the oil due to the absorption of heat released by high oil temperature while the oil temperature is increased, namely, the oil is further dried;
and fourthly, enabling finer and drier granular solid wastes in the hot oil area to enter the lower-layer hot oil area through a filter screen, pumping the hot oil and the solid waste granules in the lower-layer hot oil area into a pre-heat exchanger by a second liquid conveying pump, transferring heat to cold liquid subjected to solid-liquid separation, enabling the hot oil containing the solid wastes after cooling to enter a solid waste separation device for solid-liquid separation, discharging the separated solid granules from a solid discharge port, discharging the liquid into an oil container from a liquid discharge port, enabling the liquid in the oil container to pass through an inlet and an outlet of a third liquid conveying pump, and enabling an inlet and an outlet on a heat absorption side of the pre-heat exchanger to flow back to an upper steam area of the drying cylinder.
The invention has the following beneficial effects: 1. the energy is obviously saved, the wet and solid wastes are dried, and the recovery utilization rate of energy is improved; 2. only a little tail gas is discharged, and the secondary pollution to the environment is small; 3. the dry solid waste separated by the solid and oil is more beneficial to combustion disposal due to the oil; 4. the dry solid waste with the water content of less than 10 percent can be obtained.
Drawings
Fig. 1 is a schematic structural diagram of the first embodiment.
Fig. 2 is a schematic structural diagram of the second embodiment.
Fig. 3 is a schematic structural diagram of the third embodiment.
Description of the main component symbols: 1. a sludge conveying device; 2. a drying cylinder; 21. an upper steam zone; 211. a liquid inlet; 212. an air extraction opening; 22. a heat exchange zone; 221. a heat exchanger; 2211. a steam inlet; 2212. a condensed water outlet; 23. a lower vapor zone; 231. an air extraction opening; 24. a hot oil zone; 241. an upper hot oil zone; 242. a lower hot oil zone; 243. a first liquid outlet; 244. a second liquid outlet; 3. a vapor compressor; 31. a branch line; 41. a first liquid delivery pump; 42. a second liquid delivery pump; 43. a third liquid delivery pump; 5. a pre-heat exchanger; 51. a heat release side inlet; 52. a heat release side outlet; 53. a heat absorption side inlet; 54. a heat absorption side outlet; 6. a sludge separation device; 61. a solids discharge port; 62. a liquid discharge port; 7. an oil container; 8. filtering with a screen; 9. and (4) a stirring paddle.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
The first embodiment is as follows:
as shown in fig. 1, a sludge drying device comprises a sludge conveying device 1, a drying cylinder 2 and a steam compressor 3, wherein the drying cylinder 2 is provided with an upper steam area 21, a heat exchange area 22, a lower steam area 23 and a hot oil area 24 which are communicated with each other from top to bottom, a heat exchanger 221 is arranged in the heat exchange area 22, and the sludge conveying device 1 is connected with the lower steam area 23. The heat exchanger 221 is provided with a steam inlet 2211 and a condensed water outlet 2212, the upper steam area 21 is provided with a pumping hole 212, an inlet of the steam compressor 3 is connected with the pumping hole 212, and an outlet is connected with the steam inlet 2211 of the heat exchanger 221.
The hot oil area 24 is provided with a first liquid outlet 243 and a second liquid outlet 244, the lower part of the hot oil area 24 is divided into an upper layer hot oil area 241 and a lower layer hot oil area 242 through the filter screen 8, the first liquid outlet 243 is communicated with the upper layer hot oil area 241, and the second liquid outlet 244 is communicated with the lower layer hot oil area 242. The upper layer hot oil area 241 is internally provided with a stirring paddle 9. The first liquid outlet 243 is connected by piping to the inlet of the first liquid delivery pump 41, and the outlet of the first liquid delivery pump 41 is connected by piping to the liquid inlet 211 of the upper vapor zone 21.
A second liquid outlet 244 is provided at the bottom of the lower hot oil zone 242, and the second liquid outlet 244 is connected to the inlet of the second liquid delivery pump 42 through a pipe. The outlet of the second liquid delivery pump 42 is connected to the heat release side inlet 51 of the pre-heat exchanger 5 through a pipeline, and the heat release side outlet 52 of the pre-heat exchanger 5 is in pipeline communication with the sludge separation device 6. The sludge separation device 6 is provided with a solid discharge port 61 and a liquid discharge port 62, the liquid discharge port 62 is communicated with the oil container 7 through a pipeline, the outlet of the oil container 7 is connected to the inlet of the third liquid delivery pump 43, the outlet of the third liquid delivery pump 43 is connected to the heat absorption side inlet 53 of the pre-heat exchanger 5, and the heat absorption side outlet 54 of the pre-heat exchanger 5 is communicated with the upper steam area 21 through a pipeline.
Example two:
as shown in fig. 2, the present embodiment is different from the first embodiment in that: the lower steam zone 23 is provided with a suction opening 231, and the inlet of the steam compressor 3 is connected to the suction opening 231. The rest of the structure is the same as the first embodiment.
Example three:
as shown in fig. 3, the present embodiment is different from the first embodiment in that: a branch pipeline 31 is arranged on the pipeline between the outlet of the steam compressor 3 and the steam inlet 2211 of the heat exchanger 221, and the branch pipeline 31 is communicated with the second liquid outlet 244 of the hot oil area 24. The rest of the structure is the same as the first embodiment.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. The utility model provides a solid waste drying device which characterized in that: comprises a solid waste conveying device, a drying cylinder and a steam compressor, wherein the solid waste conveying device is communicated with the drying cylinder, the drying cylinder is sequentially provided with an upper steam area, a heat exchange area, a lower steam area and a hot oil area which are communicated with each other from top to bottom, a heat exchanger is arranged in the heat exchange area, the heat exchanger is provided with a steam inlet and a condensed water outlet, the inlet of the steam compressor is communicated with the upper steam area or the lower steam area, the outlet is communicated with the steam inlet of the heat exchanger, the hot oil area is provided with a first liquid outlet and a second liquid outlet, the first liquid outlet is communicated with the upper steam area through an internal circulation pipeline, the middle of the internal circulation pipeline is provided with a first liquid delivery pump, the second liquid outlet is communicated with the upper steam area through an external circulation pipeline, and the middle of the external circulation pipeline is provided with a second liquid delivery pump.
2. The solid waste drying apparatus of claim 1, wherein: the external circulation pipeline comprises a second liquid conveying pump, a pre-heat exchanger, a solid-liquid separation device, an oil container, a third liquid conveying pump and a plurality of pipelines, wherein an inlet of the second liquid conveying pump is communicated with a second liquid outlet pipeline, an outlet of the second liquid conveying pump is connected to a heat release side inlet of the pre-heat exchanger through a pipeline, a heat release side outlet of the pre-heat exchanger is communicated with a solid waste separation device pipeline, the solid waste separation device is provided with a solid discharge port and a liquid discharge port, the liquid discharge port is communicated with the oil container pipeline, an outlet of the oil container is connected to an inlet of the third liquid conveying pump, an outlet of the third liquid conveying pump is connected to a heat absorption side inlet of the pre-heat exchanger, and a heat absorption side outlet of the pre-heat exchanger is communicated with an.
3. The solid waste drying apparatus of claim 1, wherein: the lower part of the hot oil area is divided into an upper layer hot oil area and a lower layer hot oil area through a filter screen, the first liquid outlet is communicated with the upper layer hot oil area, and the second liquid outlet is communicated with the lower layer hot oil area.
4. The solid waste drying apparatus of claim 3, wherein: the upper layer hot oil area is internally provided with a stirring paddle, and the stirring paddle is driven by a stirring motor fixedly arranged outside the drying cylinder.
5. The solid waste drying apparatus of claim 1, wherein: and a sludge outlet of the solid waste conveying device is communicated with a lower steam area of the drying cylinder.
6. The solid waste drying apparatus of claim 1, wherein: the outlet of the steam compressor is communicated with the second liquid outlet of the drying cylinder through a branch pipeline.
7. The solid waste drying apparatus of claim 1, wherein: the heat exchanger is also provided with a tail gas outlet for discharging non-condensable gas.
8. The solid waste drying apparatus of claim 1, wherein: the solid waste is sludge.
9. The solid waste drying apparatus of claim 1, wherein: the boiling point of the hot oil is 250-380 ℃.
10. A solid waste drying process, characterized in that the solid waste drying device of any one of claims 1 to 9 is adopted, comprising the following steps:
s1, conveying strip-shaped wet solid wastes to a hot oil area through a solid waste conveying device, and forming granular drier solid wastes by the incoming wet solid wastes under the tearing force of stirring or evaporating water;
s2, compressing the water vapor generated by evaporation into high-temperature and high-pressure water vapor through a vapor compressor, conveying the water vapor into a heat exchanger through a vapor inlet, releasing condensation heat due to the fact that the water vapor is condensed into condensed water by a pipe wall with a lower temperature, transmitting the condensation heat to oil adhered to the inner wall of the heat exchange pipe, and discharging the condensed water through a condensed water discharge port;
s3, conveying the cooled oil liquid to an upper steam area of the heat exchange tube through a liquid internal circulation pipeline, attaching the oil liquid to the inner wall of the heat exchange tube from top to bottom, increasing the oil temperature due to the absorption of condensation heat in the process of flowing down, and further evaporating the water in the oil by the suspended matters in the oil due to the absorption of heat released by higher oil temperature while increasing the oil temperature, namely further drying;
s4, enabling finer and drier granular solid waste in the hot oil zone to enter the lower-layer hot oil zone through a filter screen, pumping hot oil and solid waste granules in the lower-layer hot oil zone into a pre-heat exchanger by a second liquid conveying pump for further waste heat recovery, then enabling the hot oil and the solid waste granules to enter a solid waste separation device for solid-liquid separation, discharging the separated solid granules from a solid discharge port, discharging liquid into an oil container from a liquid discharge port, enabling the liquid in the oil container to pass through an inlet and an outlet of a third liquid conveying pump, and enabling an inlet and an outlet on a heat absorption side of the pre-heat exchanger to flow back to an upper steam zone of a drying cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910882695.3A CN110642497A (en) | 2019-09-18 | 2019-09-18 | Solid waste drying device and process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910882695.3A CN110642497A (en) | 2019-09-18 | 2019-09-18 | Solid waste drying device and process |
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| CN110642497A true CN110642497A (en) | 2020-01-03 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009040919A1 (en) * | 2007-09-27 | 2009-04-02 | Hitachi, Ltd. | Sludge drying apparatus |
| CN102276131A (en) * | 2011-06-30 | 2011-12-14 | 杭州电子科技大学 | Secondary steam compressed drying method of sludge |
| KR101717439B1 (en) * | 2016-02-03 | 2017-03-20 | 주식회사 동성에코어 | Drying system for sludge |
| CN211170400U (en) * | 2019-09-18 | 2020-08-04 | 厦门绿邦膜技术有限公司 | Solid waste drying device |
-
2019
- 2019-09-18 CN CN201910882695.3A patent/CN110642497A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009040919A1 (en) * | 2007-09-27 | 2009-04-02 | Hitachi, Ltd. | Sludge drying apparatus |
| CN102276131A (en) * | 2011-06-30 | 2011-12-14 | 杭州电子科技大学 | Secondary steam compressed drying method of sludge |
| KR101717439B1 (en) * | 2016-02-03 | 2017-03-20 | 주식회사 동성에코어 | Drying system for sludge |
| CN211170400U (en) * | 2019-09-18 | 2020-08-04 | 厦门绿邦膜技术有限公司 | Solid waste drying device |
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