CN219670341U - Novel waste heat utilization moving bed sludge drying device - Google Patents
Novel waste heat utilization moving bed sludge drying device Download PDFInfo
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- CN219670341U CN219670341U CN202320894806.4U CN202320894806U CN219670341U CN 219670341 U CN219670341 U CN 219670341U CN 202320894806 U CN202320894806 U CN 202320894806U CN 219670341 U CN219670341 U CN 219670341U
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- sludge
- moving bed
- flue gas
- flue
- waste heat
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- 239000010802 sludge Substances 0.000 title claims abstract description 125
- 238000001035 drying Methods 0.000 title claims abstract description 34
- 239000002918 waste heat Substances 0.000 title claims abstract description 20
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000003546 flue gas Substances 0.000 claims abstract description 41
- 239000000428 dust Substances 0.000 claims abstract description 11
- 238000007599 discharging Methods 0.000 claims description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 15
- 238000002156 mixing Methods 0.000 abstract description 5
- 238000006477 desulfuration reaction Methods 0.000 abstract description 4
- 230000023556 desulfurization Effects 0.000 abstract description 4
- 238000003763 carbonization Methods 0.000 abstract description 3
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Drying Of Solid Materials (AREA)
Abstract
The utility model relates to the technical field of chemical industry and environmental protection desulfurization, in particular to a novel waste heat utilization moving bed sludge drying device, which comprises a sludge drying system, wherein the sludge drying system comprises a moving bed, and a first flue connected with an outlet of an air preheater and a second flue connected with an outlet of a dust remover are arranged on the moving bed; and the flue I discharges hot flue gas to the moving bed by utilizing the pressure difference of the air preheater, and the flue gas subjected to countercurrent heat exchange enters the outlet of the dust remover through the flue II. According to the utility model, the municipal sludge moisture is evaporated through the temperature of the tail flue gas of the air preheater, the water content of the sludge is further reduced through the waste heat of the flue gas, and better conditions are provided for subsequent blending or carbonization. The sludge drying device fully utilizes the condition of the existing power unit flue gas system, can synchronously realize sludge drying under the condition of less energy consumption, and solves the problems of difficult treatment and high treatment cost of the existing sludge.
Description
Technical Field
The utility model relates to the technical fields of chemical industry and environmental protection desulfurization, in particular to a novel waste heat utilization moving bed sludge drying device.
Background
At present, sludge is mainly transported and disposed of after decrement dehydration in a sewage plant. The water content of the sludge from a sewage treatment plant is generally 75-85% through mechanical dehydration, and if the water content of the sludge is reduced to below 20%, the conventional sludge drying technology usually adopts an electric heating or steam heating mode, so that a large amount of energy sources are required to be consumed, and the sludge drying cost is high.
The drying and blending technology also improves the heat value of the sludge after reducing the water content of the sludge through drying, and then carries out blending treatment with garbage or a coal-fired power plant, the high temperature promotes the combustion of organic matters in the sludge to release high heat, the sludge can be used for power generation and heating, the sludge is subjected to maximum reduction and harmlessness, the produced fly ash and smoke dust particles are treated by the original treatment system of the power plant to reach the standard and discharged, and the only disadvantage is that the power plant needs to provide a large amount of energy sources to dry the sludge at present, so that the running cost of the dried sludge is higher.
The outlet flue gas of the air preheater is high-temperature flue gas, and the flue gas temperature is generally 110-140 ℃. The clean flue gas is discharged through a chimney after the flue gas generally passes through a dust removal and desulfurization system, the normal temperature of the normal desulfurization system is maintained between 90 ℃ and 100 ℃ under the general condition, and excessive heat is carried by water into the atmosphere, so that energy waste is caused. Therefore, a novel waste heat utilization moving bed sludge drying device is provided.
Disclosure of Invention
The utility model aims to provide a novel waste heat utilization moving bed sludge drying device, which can realize sludge drying synchronously under the condition of fully utilizing the smoke system of the existing power unit and consuming less energy, and solves the problems of difficult treatment and high treatment cost of the existing sludge.
In order to achieve the above purpose, the present utility model provides the following technical solutions: the novel waste heat utilization moving bed sludge drying device comprises a sludge drying system, wherein the sludge drying system comprises a moving bed, and a first flue connected with an outlet of an air preheater and a second flue connected with an outlet of a dust remover are arranged on the moving bed;
and the flue I discharges hot flue gas to the moving bed by utilizing the pressure difference of the air preheater, and the flue II is used for conveying the flue gas in the moving bed after countercurrent heat exchange to the outlet of the dust remover.
Preferably, the system also comprises a sludge feeding system, wherein the sludge feeding system comprises a sludge bin, a sludge bucket type lifter and a moving bed feeding chute;
the sludge bin is used for receiving sludge loaded and unloaded by the municipal sludge truck, and conveying the sludge into the sludge bucket type lifting machine through a discharging device of the sludge bin, wherein the sludge bucket type lifting machine is used for lifting the sludge to a moving bed feeding chute, and the moving bed feeding chute is used for continuously conveying the sludge to the moving bed.
Preferably, the system also comprises a sludge external circulation system, wherein the sludge external circulation system comprises a double-screw conveyor, a circulator and a circulation chute, and the double-screw conveyor is arranged at the bottom of the moving bed;
the double screw conveyor is used for conveying the circulated sludge to a circulator, and the circulator is used for lifting the sludge to a circulation chute.
Preferably, the double-screw conveyor realizes discharging and feeding to the circulator through forward rotation and reverse rotation of the motor, and is provided with two discharging ports, one for connecting with the circulator and the other for discharging.
Preferably, the inside mud internal circulation system that is provided with of moving bed includes annular water conservancy diversion ring, deflector and second grade direction ring from top to bottom in proper order.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, part of the flue gas at the outlet of the air preheater is extracted, the municipal sludge moisture is evaporated through the temperature of the flue gas at the tail of the air preheater, the water content of the sludge is further reduced through the waste heat of the flue gas, and better conditions are provided for subsequent blending burning or carbonization. The heat of the flue gas at the outlet of the air preheater is used for heating the sludge, the mass and energy exchange is carried out on the sludge and the hot flue gas through the moving bed gas-solid heat exchange system, the energy of the hot flue gas is utilized for evaporating the water in the sludge, the purpose of further reducing the water content of the sludge is finally achieved, and the problems of difficult treatment and high treatment cost of the existing sludge are solved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model.
In the figure: 101. a first flue; 102. moving a bed; 103. flue II; 201. a sludge bin; 202. a sludge bucket lifter; 203. moving a bed feed chute; 301. a double screw conveyor; 302. a circulator; 303. a circulation chute; 304. a discharge port; 401. a steering plate; 402. an annular guide ring; 403. a secondary guide ring.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, a novel waste heat utilization moving bed sludge drying device comprises four functional modules, namely a sludge feeding system, a sludge drying system, a sludge external circulation system and a sludge internal circulation system;
the sludge feeding system is characterized in that a municipal sludge truck loads and unloads sludge into a sludge bin 201, the sludge is conveyed into a sludge bucket elevator 202 through a discharging device of the sludge bin 201, the sludge is lifted to a moving bed feeding chute 203 through the sludge bucket elevator 202, and the sludge is continuously conveyed to a moving bed 102 through the moving bed feeding chute 203; the moving bed 102 is arranged in a countercurrent way, sludge enters from an upper chute, and waste heat flue gas is discharged from the upper part;
in the sludge drying system, a flue is independently arranged behind an outlet of the air preheater, hot flue gas is discharged to the moving bed 102 through pressure difference, and the flue gas subjected to countercurrent heat exchange enters the outlet of the dust remover through the flue. The moving bed 102, in order to prevent secondary dust generated in the sludge drying process, an annular guide ring 402 is arranged at the upper part of the chute, the annular guide ring 402 divides two media of sludge and flue gas into two sections, the center of the flue gas is provided with a ring, materials flow from the annular guide ring 402 to the turning plate 401, in order to prevent the corrosion of the equipment caused by excessive humidity of the flue gas, the annular guide ring 402 in the moving bed 102 is made of 316L stainless steel;
the sludge external circulation system is characterized in that the surface temperature of the sludge is continuously increased after the sludge is in primary contact, but the surface temperature of the sludge is increased due to the fact that the surface area of the sludge is small and the circulation times are required to be increased, so that the final water content of the sludge is reduced, a double-screw conveyor 301 is arranged at the bottom of a moving bed 102, two discharge ports 304 are formed in the double-screw conveyor 301, one discharge port enters a circulation machine 302, the other discharge port performs discharging operation, and the double-screw conveyor 301 realizes discharging and feeding of the circulation machine 302 through forward rotation and reverse rotation of a motor. The double screw conveyor 301 conveys the circulated sludge to the circulator 302, and the sludge is lifted to the circulation chute 303 by the circulator 302, thereby completing the whole sludge circulation process.
The sludge internal circulation system comprises an annular guide ring 402, a deflector 401 and a secondary guide ring 403. The sludge enters the moving bed 102 from the circulation chute 303, the sludge and the flue gas are in countercurrent directions, an annular guide ring 402 is arranged at the upper part of the chute for preventing secondary dust generated in the sludge drying process, the flue gas flows out from the center of the ring, and materials are guided into the steering plate 401 from the annular guide ring 402. After the material slipped to the steering plate 401, the angle was adjusted according to the humidity of flue gas feedback, under the condition that humidity is big, had steering plate 401 executor to adjust the angle, let the material more swift current to next level steering plate 401 on, through the effect of turning to and direction for flue gas and abundant contact and mass transfer of mud, finally reach the moisture through the inner loop with the mud further reduction.
The steering plate 401 in the moving bed 102 adopts an independent driving mode, the angle is adjusted according to the fed-back humidity, and under the condition of high humidity, the angle is adjusted by the actuator of the steering plate 401, so that the material can slide onto the following mass transfer member more quickly; a secondary guide ring 403 is arranged in the moving bed 102, and the contact time of the flue gas and the sludge is prolonged under the action of the secondary guide ring 403; the material subjected to heat exchange is conveyed to a circulator 302 through a double-screw conveyor 301, and enters a circulation chute 303 through the lifting of the circulator 302, so that the sludge is subjected to continuous circulation heat exchange, and the water content of the sludge is reduced;
the moving bed 102 controls the temperature of the outlet flue gas to be 90-120 ℃ and performs discharging operation through the set humidity of the flue gas.
When the device is used, part of flue gas at the outlet of the air preheater is extracted, the municipal sludge is vaporized by the temperature of the flue gas at the tail of the air preheater, the water content of the sludge is further reduced by the waste heat of the flue gas, and better conditions are provided for subsequent blending or carbonization. The heat of the flue gas at the outlet of the air preheater is used for heating the sludge, the mass and energy exchange is carried out on the sludge and the hot flue gas through the moving bed 102 gas-solid heat exchange system, the energy of the hot flue gas is used for evaporating the water in the sludge, and finally the purpose of further reducing the water content of the sludge is achieved.
Compared with the existing contact drying and non-contact mode, the utility model has higher heat exchange efficiency, and the sludge and the waste heat flue gas are mixed more uniformly by special runner treatment, so that the flue gas waste heat is utilized more fully. The system upgrade can be carried out according to the needs, the problem of sludge water content reduction can be easily realized through the frequency setting of the circulating machine 302, the problems of low contact type drying efficiency, high failure rate and more flexible operation mode at present are solved. The heat of the outlet of the air preheater of the boiler is utilized, the heat belongs to the energy for emptying, and the waste heat utilization of the part is used for improving the efficiency of the boiler in a broad sense, so that the purposes of energy conservation and emission reduction are achieved. The sludge drying degree and the treatment capacity can be adjusted according to the outlet temperature and the humidity, so that the problems existing in the current implementation of drying are solved. And the process flow is short, the controllable equipment is less, the occupied area is small, the field requirement is low, and the method has great advantages in field utilization.
Although embodiments of the present utility model have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a novel waste heat utilization moving bed sludge drying device which characterized in that: the system comprises a sludge drying system, wherein the sludge drying system comprises a moving bed (102), and a first flue (101) connected with an outlet of an air preheater and a second flue (103) connected with an outlet of a dust remover are arranged on the moving bed (102);
and the flue I (101) is used for discharging hot flue gas to the moving bed (102) by utilizing the pressure difference of the air preheater, and the flue II (103) is used for conveying the flue gas in the moving bed (102) after countercurrent heat exchange to the outlet of the dust remover.
2. The novel waste heat utilization moving bed sludge drying device according to claim 1, wherein: the device also comprises a sludge feeding system, wherein the sludge feeding system comprises a sludge bin (201), a sludge bucket type lifter (202) and a moving bed feeding chute (203);
the sludge bin (201) is used for receiving sludge loaded and unloaded by the municipal sludge truck and conveying the sludge into the sludge bucket type lifting machine (202) through a discharging device of the sludge bin (201), the sludge bucket type lifting machine (202) is used for lifting the sludge to the moving bed feeding chute (203), and the moving bed feeding chute (203) is used for continuously conveying the sludge to the moving bed (102).
3. The novel waste heat utilization moving bed sludge drying device according to claim 1, wherein: the device also comprises a sludge external circulation system, wherein the sludge external circulation system comprises a double-screw conveyor (301), a circulator (302) and a circulation chute (303), and the double-screw conveyor (301) is arranged at the bottom of the moving bed (102);
the double screw conveyor (301) is used for conveying circulating sludge to a circulating machine (302), and the circulating machine (302) is used for lifting the sludge to a circulating chute (303).
4. A novel waste heat utilization moving bed sludge drying apparatus as claimed in claim 3, wherein: the double-screw conveyor (301) realizes discharging and feeding to the circulator (302) through forward rotation and reverse rotation of the motor, and the double-screw conveyor (301) is provided with two discharging ports (304), one is used for connecting with the circulator (302), and the other is used for discharging.
5. The novel waste heat utilization moving bed sludge drying device according to claim 1, wherein: the inside of the moving bed (102) is provided with a sludge internal circulation system, and the inside of the moving bed sequentially comprises an annular guide ring (402), a steering plate (401) and a secondary guide ring (403) from top to bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320894806.4U CN219670341U (en) | 2023-04-20 | 2023-04-20 | Novel waste heat utilization moving bed sludge drying device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320894806.4U CN219670341U (en) | 2023-04-20 | 2023-04-20 | Novel waste heat utilization moving bed sludge drying device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219670341U true CN219670341U (en) | 2023-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320894806.4U Active CN219670341U (en) | 2023-04-20 | 2023-04-20 | Novel waste heat utilization moving bed sludge drying device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219670341U (en) |
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2023
- 2023-04-20 CN CN202320894806.4U patent/CN219670341U/en active Active
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