CN216106589U - Device for drying sludge by using shunting ash return external bed - Google Patents
Device for drying sludge by using shunting ash return external bed Download PDFInfo
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- CN216106589U CN216106589U CN202122937132.5U CN202122937132U CN216106589U CN 216106589 U CN216106589 U CN 216106589U CN 202122937132 U CN202122937132 U CN 202122937132U CN 216106589 U CN216106589 U CN 216106589U
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Abstract
A device for drying sludge by using an external ash diversion and return bed. When the flue gas is used for drying, if the flue gas is generated by the waste heat of the kiln, the drying efficiency is lower, and because the pressure of the flue gas at the tail part is lower, equipment such as flue gas pressurization or a draught fan needs to be added. The utility model comprises the following components: the device comprises a hearth (1), a separator (2), a material returning device (3), a dust remover (8) and a chimney (9), wherein an ash outlet at the bottom of the separator is respectively communicated to the material returning device and a separated ash returning external bed (5) through a circulating ash flow valve (4), a sludge pipe (512) of the separated ash returning external bed is communicated with an outlet of a sludge bin (10), a waste gas pipe (54) of the separated ash returning external bed is communicated with a condenser (11), and a waste gas outlet of the condenser is led to a dense phase zone at the lower part of the hearth; and after the shunting ash return external bed is dried, the mixture returns to the hearth from the low-temperature ash outlet pipe (53). The utility model is used for drying sludge by using the shunting return ash external bed.
Description
Technical Field
The utility model relates to the technical field of fluidized bed boilers, in particular to a device for drying sludge by using a shunting return ash external bed.
Background
In recent years, the sewage sludge drying technology is developed rapidly. Sewage treatment plants are built in large scale in China, but sludge treatment and disposal are ignored all the time. The sludge of the sewage treatment plant mainly comprises primary sedimentation tank (sand basin) and oil separation tank bottom mud, floating slag of an air flotation machine, residual activated sludge and chemical sludge of other process units. Sludge is a solid waste, and is a hazardous waste if one of the characteristics of acute toxicity, flammability, reactivity, corrosiveness, leaching toxicity, and disease infectivity. In the 80 s of the last century, due to the gradual prominence of various limiting conditions and adverse factors of sludge in agriculture, landfill and sea throwing, the sludge drying technology is more and more emphasized by the developing national environmental engineering community. The biggest bottleneck of sludge disposal is drying reduction, and high cost is always a difficult problem which troubles the industry. At present, aiming at sludge drying, a plurality of technologies have been developed in the industry, and the drying mode mainly includes two types: direct drying and indirect drying.
The direct drying means that the sludge is directly dried by utilizing heat. 1. An electric energy sludge drying method is to convert electric energy into energy in the forms of heat energy or microwaves and the like, heat wet sludge to evaporate water, and dry the sludge, and usually adopts an electric heating furnace to indirectly dry the sludge. Because the energy consumption is high and precious secondary energy is utilized, the method is not suitable for sewage treatment plants with short electricity consumption and large sludge production. 2. The solar sludge drying method is a sludge treatment technology for drying and stabilizing sludge in a sewage treatment plant by using solar energy as a main energy source. The technology utilizes solar energy, and has the advantages of low-temperature drying, low operation cost, simple operation, safe and stable operation and the like by means of the traditional greenhouse drying process. But has significant disadvantages: 1) the influence of weather, season, weather and the like is great; 2) because the solar energy absorption mode is adopted, the drying efficiency is obviously lower than that of other technologies; 3, the floor area for drying is large, and the generated odor is not easy to collect and concentrate for treatment. 3. The natural gas (coal gas) drying method is to use natural gas (coal gas) as a heat source for fuel and dry sludge in a drying device. However, the technology has the risk of combustion and explosion, and a series of security measures such as nitrogen protection, oxygen concentration linkage, temperature linkage, sludge backmixing and the like are generally required to prevent the combustion and explosion so as to improve the safety of equipment operation, and the technology has less practical application in China.
The indirect drying is to use hot water, flue gas or steam as a drying medium to exchange heat with sludge in various heat exchangers to evaporate water in the sludge so as to dry the sludge. The technology needs to increase heat exchange equipment, and the requirement on the material of the heat exchanger is high, so the initial investment is high. In addition, there are corresponding disadvantages for different drying media: such as hot water and steam, as the drying medium, valuable steam and hot water energy is consumed; when the flue gas is used for drying, if the kiln waste heat flue gas (120-200 ℃) is used, the drying efficiency is low, and because the tail flue gas pressure is low, equipment such as flue gas pressurization or an induced draft fan and the like needs to be added; if high-temperature flue gas is used, the actual operation difficulty is high, and the safety factor is low.
In conclusion, various drying technologies have certain disadvantages, and corresponding drying equipment is required to be added, so that the initial investment is high.
Disclosure of Invention
The utility model aims to solve the problems and provide a device for drying sludge by using a shunting return ash external bed.
The above purpose is realized by the following technical scheme:
the utility model provides an use device of reposition of redundant personnel ash returning external bed dry sludge, its constitution includes: the device comprises a hearth, a separator, a return feeder, a dust remover and a chimney, wherein an ash outlet at the bottom of the separator is respectively communicated to the return feeder and a split-flow ash return external bed through a circulating ash flow valve, a sludge pipe of the split-flow ash return external bed is communicated with an outlet of a sludge bin, an exhaust gas pipe of the split-flow ash return external bed is communicated with a condenser, and an exhaust gas outlet of the condenser is led to a dense-phase zone at the lower part of the hearth;
and after the shunting ash return external bed is dried, the mixture returns to the hearth from the low-temperature ash outlet pipe.
The device for drying the sludge by using the ash shunting and returning external bed comprises a box body, wherein an air chamber and a working area are arranged in the box body, the working area is divided into an ash discharging distribution area, a high-temperature ash returning area, a sludge drying area and a low-temperature ash returning area by a partition plate, and the air chamber is divided into a high-temperature air chamber, a drying air chamber and a low-temperature air chamber by the partition plate;
the outlet of the high-pressure fluidization fan is respectively connected with the high-temperature air chamber, the drying air chamber and the inlet of the low-temperature air chamber;
the outlet of the air chamber is communicated with the lower parts of the ash distribution area and the high-temperature ash return area, the outlet of the drying air chamber is communicated with the lower part of the sludge drying area, and the outlet of the low-temperature air chamber is communicated with the lower part of the low-temperature ash return area.
The use reposition of redundant personnel returns device of ash external bed dry sludge, box side high temperature ash returning charge district department high temperature ash play ash pipe has, box side low temperature ash returning charge district department low temperature ash play ash pipe has, box top ash distribution district department have into ash pipe, box top sludge drying district department sludge pipe has, box top low temperature ash returning charge district department waste gas pipe has.
The device for drying sludge by using the ash diversion return external bed is characterized in that a steam-water heating surface and an air preheater are arranged in a tail flue between the separator and the dust remover.
Has the advantages that:
1. when the sludge is dried, the drying heat comes from the high-temperature circulating ash of the boiler, so that precious secondary energy and hot water steam resources are not consumed;
2. the utility model utilizes the circulating ash to dry the sludge, and the heat source quality is high, so the system has higher drying efficiency;
3. the final outlets of the drying devices are all connected with a boiler hearth, and sludge and dry exhaust gas are all finally treated in the boiler without releasing harmful substances;
4. the utility model utilizes the external bed to dry the sludge, does not need to add new equipment, and has less initial investment and low reconstruction cost.
5. According to the utility model, the distribution valve is arranged at the lower part of the boiler separator to distribute the circulating ash, part of the circulating ash obtained by distributing the circulating ash enters the external bed to dry the sludge by using the heat of the ash, the dried sludge is directly fed into the furnace for incineration, and the exhaust gas generated by drying is condensed to remove the moisture and then fed into the furnace for treatment.
Description of the drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of the split ash return external bed;
FIG. 3 is a side view of the split ash return bed;
FIG. 4 is a top view of the split ash return external bed;
in the figure: 1. a hearth; 2. a separator; 3. a material returning device; 4. a circulating ash stream valve; 5. shunting and returning to an ash external bed; 6. steam-water heating surface; 7. an air preheater; 8. a dust remover; 9. a chimney; 10. a sludge bin; 11. a condenser; 12. a high pressure fluidization air blower; 51. an ash inlet pipe; 52. a high-temperature ash discharging pipe; 53. a low-temperature ash discharging pipe; 54. an exhaust gas pipe; 55. an ash distribution area; 56. a high temperature ash return zone; 57. a sludge drying zone; 58. a low temperature ash return zone; 59. a high temperature plenum; 510. a drying air chamber; 511. a low temperature plenum; 512. a sludge pipe.
The specific implementation mode is as follows:
example 1:
the utility model provides an use device of reposition of redundant personnel ash returning external bed dry sludge, its constitution includes: the device comprises a hearth 1, a separator 2, a material returning device 3, a dust remover 8 and a chimney 9, wherein an ash outlet at the bottom of the separator is respectively communicated to the material returning device and an ash shunting and returning external bed 5 through a circulating ash flow valve 4, a sludge pipe 512 of the ash shunting and returning external bed is communicated with an outlet of a sludge bin 10, an exhaust gas pipe 54 of the ash shunting and returning external bed is communicated with a condenser 11, and a waste gas outlet of the condenser is led to a dense-phase zone at the lower part of the hearth;
after the shunting ash return external bed is dried, the mixture returns to the hearth from the low-temperature ash discharge pipe 53.
Example 2:
the device for drying sludge by using the ash diversion and return external bed according to embodiment 1, the ash diversion and return external bed comprises a box body, an air chamber and a working area are arranged in the box body, the working area is divided into an ash discharge distribution area 55, a high-temperature ash return area 56, a sludge drying area 57 and a low-temperature ash return area 58 by partition plates, and the air chamber is divided into a high-temperature air chamber 59, a drying air chamber 510 and a low-temperature air chamber 511 by partition plates;
the outlet of the high-pressure fluidization fan 12 is respectively connected with the high-temperature air chamber, the drying air chamber and the inlet of the low-temperature air chamber;
the outlet of the air chamber is communicated with the lower parts of the ash distribution area and the high-temperature ash return area, the outlet of the drying air chamber is communicated with the lower part of the sludge drying area, and the outlet of the low-temperature air chamber is communicated with the lower part of the low-temperature ash return area.
Example 3:
according to embodiment 1 or 2 the device of dry sludge of external bed of ash is returned in use reposition of redundant personnel ash, box side high temperature ash returning charge district department have high temperature ash pipe 52, box side low temperature ash returning charge district department have low temperature ash pipe 53, box top ash distribution district department have into ash pipe 51, box top sludge drying district department have a sludge pipe, box top low temperature ash returning charge district department have an exhaust gas pipe.
Example 4:
according to the device for drying sludge by using the ash diversion and return external bed in the embodiment 1, 2 or 3, a steam-water heating surface 6 and an air preheater 7 are arranged in a tail flue between the separator and the dust remover.
The working principle is as follows: the flue gas outlet of the hearth is connected with the inlet of the separator, the flue gas generated by combustion of the hearth enters the separator and then separates the circulating ash with larger particles in the flue gas by using inertia, the flue gas after large particle circulation is separated enters the tail flue from the flue gas outlet of the separator, and the separated circulating ash is discharged from the ash outlet at the bottom of the separator. A circulating ash flow valve is arranged at an ash outlet at the bottom of the separator, and the circulating ash outlet is respectively connected with an inlet of the material returning device and an ash inlet of the shunting ash return external bed;
the operation method of the shunting and ash returning external bed comprises the following steps: circulating ash discharged from an ash outlet of the self-separator is distributed through a circulating ash flow valve, one part of circulating ash enters an ash distribution area through an ash inlet pipe, is further divided under the action of fluidized air from a high-temperature air chamber, one part of circulating ash enters a high-temperature ash returning area, the other part of circulating ash enters a sludge drying area, an outlet of a sludge bin is connected to the sludge drying area through a sludge pipe, and sludge and circulating ash are mixed at the position to perform heat exchange, so that the drying of the sludge is realized. After drying, the mixture enters a low-temperature ash returning area under the action of fluidizing air of a drying air chamber, returns to a hearth from a low-temperature ash discharge pipe under the action of fluidizing air of a low-temperature air chamber, and an ash returning opening is arranged in a dense-phase area at the lower part of the hearth.
The dry exhaust gas (the odor and water vapor separated out by the fluidized air mixed sludge) is discharged from an exhaust gas pipe, the exhaust gas pipe is connected with a condenser and is used for separating the moisture in the exhaust gas, the treatment in the furnace is convenient, the heat efficiency of the boiler is not reduced, and an exhaust gas outlet of the condenser is led to a dense-phase area at the lower part of a hearth, namely the exhaust gas enters the furnace for harmless treatment.
The outlet of the high-pressure fluidization fan is respectively connected with the inlets of the high-temperature air chamber, the drying air chamber and the low-temperature air chamber, the outlet of the air chamber is communicated with the lower parts of the ash distribution area and the high-temperature ash return area, the outlet of the drying air chamber is communicated with the lower part of the sludge drying area, and the outlet of the low-temperature air chamber is communicated with the lower part of the low-temperature ash return area and is used for providing fluidization air for the materials shunted to each area of the ash return external bed.
The other part of the circulating ash distributed by the circulating ash flow valve enters a material returning device, an outlet of the material returning device is connected to a dense-phase area at the lower part of the hearth, and the circulating ash entering the material returning device is returned to the hearth; and a steam-water heating surface and an air preheater are arranged in the tail flue and are respectively used for transferring the heat of the flue gas to a steam-water system and cold air. The tail flue is sequentially provided with a dust remover and a chimney, and the flue gas after heat transfer enters the dust remover, then small particle fly ash carried in the flue gas is further removed, and then the flue gas enters the chimney to be discharged.
Claims (4)
1. The utility model provides an use device of reposition of redundant personnel ash returning external bed dry sludge, its constitution includes: furnace, separator, returning charge ware, dust remover and chimney, characterized by: the bottom ash outlet of the separator is respectively communicated to the material returning device and the split-flow ash returning external bed through a circulating ash flow valve, a sludge pipe of the split-flow ash returning external bed is communicated with a sludge bin outlet, an exhaust gas pipe of the split-flow ash returning external bed is communicated with a condenser, and a dead gas outlet of the condenser is led to a dense-phase zone at the lower part of the hearth;
and after the shunting ash return external bed is dried, the mixture returns to the hearth from the low-temperature ash outlet pipe.
2. The apparatus of claim 1 for drying sludge using a split ash return external bed, wherein: the split-flow ash-returning external bed comprises a box body, wherein an air chamber and a working area are arranged in the box body, the working area is divided into an ash discharging distribution area, a high-temperature ash returning area, a sludge drying area and a low-temperature ash returning area by a partition plate, and the air chamber is divided into a high-temperature air chamber, a drying air chamber and a low-temperature air chamber by the partition plate;
the outlet of the high-pressure fluidization fan is respectively connected with the high-temperature air chamber, the drying air chamber and the inlet of the low-temperature air chamber;
the outlet of the air chamber is communicated with the lower parts of the ash distribution area and the high-temperature ash return area, the outlet of the drying air chamber is communicated with the lower part of the sludge drying area, and the outlet of the low-temperature air chamber is communicated with the lower part of the low-temperature ash return area.
3. The apparatus of claim 2 for drying sludge using the ash diversion return external bed, wherein: the box side high temperature ash returns material district department and has a high temperature ash pipe, box side low temperature ash returns material district department and has a low temperature ash pipe, box top ash distribution district department have into the ash pipe, box top sludge drying district department sludge pipe has, box top low temperature ash returns material district department and has the exhaust gas pipe.
4. The apparatus of claim 3 for drying sludge using the ash diversion return external bed, wherein: and a steam-water heating surface and an air preheater are arranged in a tail flue between the separator and the dust remover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122937132.5U CN216106589U (en) | 2021-11-27 | 2021-11-27 | Device for drying sludge by using shunting ash return external bed |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122937132.5U CN216106589U (en) | 2021-11-27 | 2021-11-27 | Device for drying sludge by using shunting ash return external bed |
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| CN216106589U true CN216106589U (en) | 2022-03-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105439A (en) * | 2021-11-27 | 2022-03-01 | 华能国际电力江苏能源开发有限公司南京电厂 | Device for drying sludge by using shunting ash return external bed |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114105439A (en) * | 2021-11-27 | 2022-03-01 | 华能国际电力江苏能源开发有限公司南京电厂 | Device for drying sludge by using shunting ash return external bed |
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