CN114963190A - Sludge incineration system and sludge incineration method - Google Patents
Sludge incineration system and sludge incineration method Download PDFInfo
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- CN114963190A CN114963190A CN202210674803.XA CN202210674803A CN114963190A CN 114963190 A CN114963190 A CN 114963190A CN 202210674803 A CN202210674803 A CN 202210674803A CN 114963190 A CN114963190 A CN 114963190A
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- 239000010802 sludge Substances 0.000 title claims abstract description 324
- 238000000034 method Methods 0.000 title claims abstract description 21
- 239000000843 powder Substances 0.000 claims abstract description 211
- 238000001035 drying Methods 0.000 claims abstract description 109
- 238000002156 mixing Methods 0.000 claims abstract description 73
- 239000012159 carrier gas Substances 0.000 claims description 68
- 238000000926 separation method Methods 0.000 claims description 14
- 230000002457 bidirectional effect Effects 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000003139 buffering effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 abstract description 8
- 238000004200 deflagration Methods 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 5
- 230000003247 decreasing effect Effects 0.000 description 6
- 239000000779 smoke Substances 0.000 description 4
- 238000004064 recycling Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 238000009264 composting Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000010808 liquid waste Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
- F23G5/442—Waste feed arrangements
- F23G5/444—Waste feed arrangements for solid waste
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2201/00—Pretreatment
- F23G2201/10—Drying by heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2205/00—Waste feed arrangements
- F23G2205/12—Waste feed arrangements using conveyors
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
Abstract
The invention discloses a sludge incineration system and a sludge incineration method, wherein the sludge incineration system comprises a wet sludge drying module, a wet sludge incineration module and an incinerator, the wet sludge drying module dries wet sludge to be dried to obtain dry sludge, fine powder generated in the wet sludge drying process is collected through a fine powder collecting device, the collected fine powder and the wet sludge to be incinerated in a wet sludge incineration bin are mixed in a mixing and conveying device and then are conveyed to the incinerator through a first inlet on the incinerator for incineration, and the fine powder generated in the wet sludge drying process is mixed with the wet sludge to be incinerated and then are conveyed to the incinerator for incineration, so that the phenomena of deflagration and upward movement of a combustion area after entering the incinerator and instability of combustion due to small fine powder particles can be prevented.
Description
Technical Field
The invention relates to the technical field of sludge treatment and environmental protection, in particular to a sludge incineration system and a sludge incineration method.
Background
At present, the sludge disposal method mainly comprises three methods of landfill, composting agriculture and incineration. The waste of land resources is large by sludge landfill, and secondary pollution is easily caused to the environment by percolate in the transportation process and the landfill site; when sludge is composted or compound microbial fertilizer is prepared, heavy metal and harmful substances in the sludge cannot be effectively removed, and heavy metal ions are easy to accumulate in soil and plants, so that the land utilization is limited; the sludge incineration can destroy organic matters, kill pathogens and reduce the volume of the sludge to the maximum extent, the dried sludge is a fuel with low calorific value, and the incinerated ash can not cause secondary pollution. Therefore, in the field of sludge treatment, the application range of sludge drying and incineration is wide.
A fluidized bed drier and an incinerator are core devices for sludge drying and incineration, wherein the fluidized bed drier dries wet sludge with the water content of 80% to generate dry sludge with the water content of 10% or less, and the incinerator is an environment-friendly device which burns waste gas, waste liquid and solid waste at high temperature to achieve reduction, stabilization and harmlessness. The fluidized bed dryer adopts a heat source to exchange heat with sludge, and brings out moisture in wet sludge to achieve the purpose of sludge drying, the dried sludge is sent into an incinerator to be incinerated, but due to severe internal flow state of the fluidized bed dryer, fine powder generated by sludge particle friction is brought out by fluidized air, fine powder recovery is realized by carrier gas through a fine powder separation device, and due to small fine powder particles, deflagration and upward movement of a combustion area are easy to occur after the carrier gas enters the incinerator. Therefore, the control of the fine powder entering the incinerator has great significance for sludge combustion and flue gas emission control of the incinerator. At present, the dry sludge and the fine powder of the fluidized bed dryer are mixed and then injected into a furnace through a dry sludge feeding injector. The temperature of the incinerator is increased due to fine powder in dry sludge entering the incinerator, the incinerator is over-temperature, coking and smoke emission indexes (NOx and CO) are increased in a step mode, and even the risk of exceeding standards exists.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a sludge incineration system and an incineration method.
The invention solves the technical problems through the following technical scheme:
a sludge incineration system, comprising:
the system comprises a wet sludge drying module, a sludge drying module and a sludge drying module, wherein the wet sludge drying module comprises a drying device and a fine powder collecting device, and the drying device is used for drying wet sludge to be dried to obtain dry sludge; the fine powder collecting device is used for collecting fine powder generated in the wet sludge drying process;
the wet sludge incineration module comprises a wet sludge incineration bin, a mixing and conveying device and an incinerator, wherein a first inlet is formed in the incinerator, and the first inlet is connected with the mixing and conveying device;
the fine powder collected by the fine powder collecting device is mixed with wet sludge to be incinerated in the wet sludge incineration bin in the mixing and conveying device, and the mixture enters the incinerator for incineration through the first inlet. In this technical scheme, wet sludge drying module treats the mummification wet sludge mummification and obtains dry sludge, and collect the fine powder that wet sludge drying in-process produced through the farine collection device, send the fine powder that collects and the wet sludge who burns in the wet sludge feed bin to the incinerator through the first entry on the incinerator after mixing in mixing conveyor and burn, send the incinerator to burn after mixing the fine powder that wet sludge drying in-process produced and wet sludge, can prevent because the fine powder granule is little, directly get into the incinerator deflagration, the combustion area shifts up, cause the unstable phenomenon of burning to take place.
Preferably, the fine powder collecting device comprises a carrier gas fine powder separating device and a fine powder buffering bin, the upper part of the drying device is provided with an air outlet, and the carrier gas fine powder separating device is connected to the air outlet so as to separate carrier gas and fine powder from the drying device; the fine powder buffer bin is positioned at the downstream of the carrier gas fine powder separation device to collect separated fine powder; the fine powder buffer bin is provided with a material level detection device and is connected with a fine powder conveying device, and the fine powder conveying device conveys fine powder to the mixing and conveying device.
In the technical scheme, a carrier gas fine powder separation device and a fine powder buffer bin are arranged, carrier gas and fine powder are separated through the carrier gas fine powder separation device, the separated fine powder is collected in the fine powder buffer bin, the fine powder storage amount in the fine powder buffer bin is judged through a material level detection device, and the fine powder is conveyed to the mixing and conveying device through a fine powder conveying device.
Preferably, the sludge incineration system comprises a carrier gas treatment device, the lower part of the drying device is provided with an air inlet, one end of the carrier gas treatment device is connected with the carrier gas fine powder separation device, and the other end of the carrier gas treatment device is connected with the air inlet.
In the technical scheme, the carrier gas treatment device is arranged to treat the carrier gas, the treated carrier gas is sent to the drying device, the carrier gas is discharged from the drying device, the temperature of the carrier gas is high, the treated carrier gas is conveyed back to the drying device, partial heat can be recycled, the recycling of the carrier gas is realized, energy is saved, the carrier gas treated by the carrier gas treatment device enters the drying device through the air inlet formed in the lower part of the drying device, the carrier gas can flow to the upper part of the drying device from the lower part of the drying device, and the recycled heat can be fully utilized.
Preferably, the wet sludge drying module further comprises a drying wet sludge bin and a drying wet sludge conveying device, the drying wet sludge conveying device is communicated with the drying wet sludge bin and the drying device, the fine powder conveying device is a bidirectional screw conveyor, one end of the bidirectional screw conveyor is connected with the mixing conveying device, and the other end of the bidirectional screw conveyor is connected with the drying wet sludge conveying device.
In the technical scheme, the fine powder conveying device adopts a bidirectional screw conveyor, so that on one hand, fine powder can be conveyed to the mixing and conveying device to mix wet sludge in the wet sludge incineration bin, and on the other hand, fine powder can be conveyed to the wet dried sludge conveying device to mix with the wet dried sludge. Particularly, when the amount of fine powder in the subdivision and buffering bin is large, the operation mode of the bidirectional screw conveyor is controlled according to the combustion condition, and a part of fine powder is conveyed to the dried wet sludge conveying device to be mixed with the dried wet sludge.
Preferably, the fine powder conveying device and the mixing conveying device are both frequency-adjustable conveying devices, a sludge moisture content detector is arranged at an outlet of the mixing conveying device, and the fine powder conveying device and the mixing conveying device are respectively adjusted according to a measured value of the sludge moisture content detector, so that the mixing proportion of fine powder and wet sludge is adjusted.
In the technical scheme, the fine powder conveying device and the mixing and conveying device both adopt conveying devices with adjustable frequencies, the supply amounts of fine powder and incineration wet sludge are respectively adjusted through frequency adjustment of the fine powder conveying device and frequency adjustment of the mixing and conveying device, and a sludge moisture content detector is arranged at an outlet of the mixing and conveying device and used for monitoring the moisture content of a mixture of the fine powder and the wet sludge so as to control the mixing ratio of the fine powder and the incineration wet sludge and further control the moisture content of the mixture of the fine powder and the wet sludge, thereby ensuring normal operation of equipment.
Preferably, the sludge incineration system further comprises a dry sludge conveying device with an input end connected with the drying device, the incinerator is further provided with a second inlet, and the second inlet is connected with an output end of the dry sludge conveying device and used for conveying dry sludge to the incinerator for incineration.
In the technical scheme, a dry sludge conveying device is arranged, one end of the dry sludge conveying device is connected with the drying device, the other end of the dry sludge conveying device is connected with a second inlet arranged on the incinerator, the dry sludge conveying device conveys dry sludge to a second inlet of the incinerator to be burnt in the incinerator, namely, a mixture of fine powder and incinerated wet sludge enters the incinerator through the first inlet, the dry sludge enters the incinerator through the second inlet, and the dry sludge is convenient to regulate and control respectively according to the condition of the sludge, so that the incinerator is efficiently utilized.
Preferably, a dry sludge bin is further connected between the dry sludge conveying device and the second inlet.
In this technical scheme, set up dry sludge feed bin and can save unnecessary dry mud to the dry mud that does not reach the burning in the future when dry mud output is big is stored, when dry mud output is low, collect the storage with it and be convenient for follow-up unified incineration disposal that carries on.
The invention also provides a sludge incineration method, which adopts the sludge incineration system and comprises the following steps:
the method comprises the following steps: storing wet sludge in a dried wet sludge bin and a incinerated wet sludge bin respectively;
step two: drying wet sludge to be dried by a wet sludge drying module to obtain dry sludge, and collecting fine powder generated in the drying process of the wet sludge by a fine powder collecting device;
step three: and conveying the fine powder collected by the fine powder collecting device and the wet sludge in the wet sludge incineration bin to the mixing and conveying device for mixing, and conveying the mixture to an incinerator for incineration through a first inlet on the incinerator.
In the technical scheme, wet sludge is respectively stored in the dried wet sludge bin and the burned wet sludge bin, the wet sludge is dried by the wet sludge drying module to obtain dry sludge, fine powder generated in the wet sludge drying process is collected by the fine powder collecting device, the fine powder generated in the wet sludge drying process is mixed with the wet sludge and then sent to the incinerator for burning, and the phenomena of unstable burning caused by deflagration and upward movement of a burning area after the fine powder directly enters the incinerator due to small fine powder particles can be prevented.
Preferably, the fine powder collecting device comprises a fine powder buffer bin, the fine powder buffer bin is connected with a fine powder conveying device, the fine powder conveying device conveys fine powder to the mixing and conveying device, the fine powder conveying device and the mixing and conveying device are frequency-adjustable conveying devices, and a sludge moisture content detector is arranged at an outlet of the mixing and conveying device; the third step further comprises: comparing the measured value W1 of the sludge water content detector with a water content set value W0, and increasing the frequency of the fine powder conveying device or reducing the frequency of the mixing and conveying device when the measured value W1 of the sludge water content detector is greater than the set value W0; when the measured value W1 of the sludge moisture content detector is less than the set value W0, the frequency of the fine powder conveying device is reduced or the frequency of the mixing and conveying device is increased.
Preferably, the sludge incineration system further comprises a dry sludge conveying device with an input end connected with the drying device, the incinerator is further provided with a second inlet, the second inlet is connected with an output end of the dry sludge conveying device, and the second step further comprises the step of conveying dry sludge to the incinerator for incineration through the second inlet by using the dry sludge conveying device.
The positive progress effects of the invention are as follows: the wet sludge drying module dries wet sludge to be dried to obtain dry sludge, fine powder generated in the wet sludge drying process is collected through the fine powder collecting device, the collected fine powder and the wet sludge to be burned in the wet sludge burning bin are mixed in the mixing and conveying device and then are conveyed into the incinerator through the first inlet on the incinerator to be burned, the fine powder generated in the wet sludge drying process is mixed with the wet sludge and then is conveyed into the incinerator to be burned, deflagration of small-particle fine powder directly entering the incinerator can be prevented, the phenomenon that the incinerator is coked and the smoke emission index is over-limited due to the fact that the incinerator is over-heated due to the fact that a combustion area moves upwards can be prevented, and therefore the operation stability of the incinerator can be improved.
Drawings
Fig. 1 is a schematic structural view of a sludge incineration system according to an embodiment of the present invention.
FIG. 2 is a schematic flow chart of a sludge incineration method according to an embodiment of the present invention.
Description of the reference numerals
Dry and wet sludge bin 1
Drying device 2
Dried wet sludge conveying device 3
Carrier gas fine powder separator 4
Fine powder buffer storage 5
Fine powder conveying device 6
Wet sludge incineration bin 7
Mixing and conveying device 8
Sludge moisture content detector 9
Dry sludge bin 11
Dry sludge conveying device 12
Sludge pump 13
Dry sludge feed injector 14
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Please refer to fig. 1 for understanding. The embodiment of the invention provides a sludge incineration system, which comprises a wet sludge drying module and a wet sludge incineration module; the wet sludge drying module comprises a drying device 2 and a fine powder collecting device, wherein the drying device 2 is used for drying wet sludge to obtain dry sludge; the fine powder collecting device is used for collecting fine powder generated in the wet sludge drying process; the wet sludge incineration module comprises an incineration wet sludge bin 7, a mixing and conveying device 8 and an incinerator 10, wherein a first inlet 101 is formed in the incinerator, and the first inlet 101 is connected with the mixing and conveying device 8; the fine powder collected in the fine powder collecting device is mixed with the wet sludge to be incinerated in the wet sludge incineration bin 7 in the mixing and conveying device, and enters the incinerator for incineration through the first inlet 101.
Utilize wet sludge drying module to treat the mummification wet sludge mummification and obtain dry sludge, and collect the fine powder that wet sludge drying process produced through the farine collection device, send the fine powder of collecting and the wet sludge who burns in the wet sludge feed bin to the incinerator through the first entry on the incinerator 10 after mixing in mixing conveyor 8 and burn, send to the incinerator through mixing the fine powder that wet sludge drying process produced and wet sludge and then burn, can prevent that the fine powder of tiny granule from directly getting into the incinerator after very easily being stirred by burning the flue gas, cause the unstable phenomenon of burning to take place.
The drying device 2 is preferably a fluidized bed dryer, but other devices capable of drying sludge can be selected in other embodiments.
The fine powder collecting device is connected with the drying device 2 and is used for collecting fine powder generated in the wet sludge drying process. The fine powder collecting device comprises a carrier gas fine powder separating device 4 and a fine powder buffering bin 5, the upper part of the drying device 2 is provided with an air outlet, and the carrier gas fine powder separating device 4 is connected with the air outlet so as to separate carrier gas and fine powder from the air outlet of the drying device; a fine powder buffer bin 5 is positioned at the downstream of the carrier gas fine powder separating device 4 to collect the separated fine powder, and is provided with a material level detecting device (not shown in figure 1) for judging the storage amount of the fine powder in the fine powder buffer bin; the fine powder buffer bin 5 is connected with a fine powder conveying device 6, and the fine powder conveying device 6 conveys fine powder to a mixing conveying device 8.
The sludge incineration system further comprises a carrier gas treatment device (not shown in figure 1) which is arranged at a carrier gas outlet of the carrier gas fine powder separation device 4, the lower part of the drying device 2 is provided with a gas inlet, one end of the carrier gas treatment device is connected with the carrier gas outlet of the carrier gas fine powder separation device, and the other end of the carrier gas treatment device is connected with the gas inlet arranged at the lower part of the drying device 2. The carrier gas treatment device is arranged to treat the carrier gas, the treated carrier gas is sent to the drying device, the carrier gas comes out of the drying device 2, the temperature of the carrier gas is high, the treated carrier gas is conveyed back to the drying device 2 through the air inlet, the heat can be recycled, the recycling of the carrier gas is realized, the energy is saved, the air inlet is arranged at the lower part of the drying device 2, and the carrier gas can flow to the upper part of the drying device from the lower part of the drying device, so that the recycled heat can be fully utilized.
As shown in fig. 1, the wet sludge drying module further comprises a dried wet sludge bin 1 and a dried wet sludge conveying device 3, the dried wet sludge conveying device 3 is communicated with the dried wet sludge bin 1 and the drying device 2, and the dried wet sludge to be dried in the dried wet sludge bin 1 is conveyed to the drying device 2 through the dried wet sludge conveying device 3 for drying. The fine powder conveying device 6 is a bidirectional screw conveyor, one end of the bidirectional screw conveyor is connected with the mixing and conveying device 8, the other end of the bidirectional screw conveyor is connected with the dried wet sludge conveying device 12, on one hand, fine powder can be conveyed to the mixing and conveying device 8 to be mixed with wet sludge in the wet sludge incineration bin 7, and on the other hand, fine powder can be conveyed to the dried wet sludge conveying device 3 to be mixed with the dried wet sludge. Especially when the amount of the fine powder in the subdivision and buffering bin is large, the operation mode of the bidirectional screw conveyor is controlled according to the combustion condition, and if the amount of the fine powder required by the mixing and conveying device is small, a part of fine powder is conveyed to the dried wet sludge conveying device to be mixed with the dried wet sludge.
The fine powder isolating valve 15 is arranged at the fine powder access port of the dried wet sludge conveying device 3 and the mixing conveying device 8, the fine powder isolating valve 15 and the bidirectional screw conveyor are controlled in a linkage mode to realize automatic control of mixing of fine powder and wet sludge, and the amount of fine powder entering the dried wet sludge conveying device 3 and the mixing conveying device 8 is controlled.
In this embodiment, the fine powder conveying device 6 and the mixing and conveying device 8 both adopt a conveying device with adjustable frequency, frequency conversion control is realized by adopting a variable frequency motor, the frequency of the fine powder conveying device 6 and the mixing and conveying device 8 is adjusted to adjust the supply amount of fine powder and the supply amount of incineration wet sludge, a sludge moisture content detector 9 is arranged at the outlet of the mixing and conveying device 8 and used for monitoring the moisture content of the mixture of the fine powder and the wet sludge, the fine powder conveying device 6 and the mixing and conveying device 8 are respectively adjusted according to the measured value of the sludge moisture content detector 9, so that the mixing proportion adjustment of the fine powder and the wet sludge is realized, and the supply amount of the fine powder and the incineration wet sludge is controlled to control the moisture content of the mixture of the fine powder and the wet sludge, so that the normal operation of the equipment is ensured. Specifically, the set value of the water content of the mixture of the fine powder and the wet sludge is set to be W0, and when the measured value W1 of the sludge water content detector 9 is greater than the set value W0, the frequency of the fine powder conveying device 6 is increased or the frequency of the mixing and conveying device 8 is decreased, so that the supply amount of the fine powder is increased or the supply amount of the wet sludge is decreased; when the measured value W1 of the sludge water content detector 9 is less than the set value W0, the frequency of the fine powder conveyor 6 is decreased or the frequency of the mixing conveyor 8 is decreased, thereby decreasing the supply amount of fine powder or increasing the supply amount of wet sludge. As shown in fig. 1, the incinerator 10 is provided with a first inlet 101 and a second inlet 102, wherein the first inlet 101 is connected with the mixing and conveying device 8, and the mixture of the fine powder and the incinerated wet sludge in the mixing and conveying device 8 enters the incinerator 10 through the first inlet 101 for incineration; the sludge incineration system further comprises a dry sludge conveying device 12, wherein the input end of the dry sludge conveying device 12 is connected with the drying device 2, and the output end of the dry sludge conveying device 12 is connected with the second inlet 102 and used for conveying dry sludge into the incinerator 10 through the second inlet 102 for incineration. Namely, the mixture of the fine powder and the incineration wet sludge enters the incinerator through the first inlet 101, and the dry sludge enters the incinerator through the second inlet 102, so that the dry sludge can be respectively regulated and controlled according to the condition of the sludge, and the incinerator can be efficiently utilized.
In the embodiment, a dry sludge bin 11 is further connected between the dry sludge conveying device 12 and the second inlet 102, and the dry sludge bin 11 can store redundant dry sludge, so that dry sludge which is not ready for incineration in the future is stored when the dry sludge yield is high, and the dry sludge is collected and stored when the dry sludge yield is low, so that the dry sludge can be incinerated uniformly and subsequently. In the present embodiment, the dried wet sludge conveying device 3 and the dried sludge conveying device 12 are screw conveying devices, but other conveying devices may be selected in other embodiments. In this embodiment, wet sludge pumps 13 are disposed between the dry sludge conveying device 12 and the drying device 2 and between the mixing conveying device 8 and the first inlet 101, so as to smoothly feed the wet sludge pumps 13 into the drying device 2 and the incinerator 10, respectively. A dry sludge feeding injector 14 is provided between the dry sludge bin and the second inlet 102, and the dry sludge is smoothly fed into the incinerator 10 by the dry sludge feeding injector 14.
Of course, in other embodiments, the fine powder can be conveyed by a combined closed conveying mode, including a screw conveyor, a bucket elevator, a scraper conveyor, a belt conveyor and the like. The sludge incineration system can also comprise a nitrogen protection device, which keeps a closed state and inert gas protection during the fine powder conveying process, avoids cooling and moisture during the sludge conveying process and prevents potential sludge dust explosion risks.
As shown in fig. 2, an embodiment of the present invention provides a sludge incineration method, which uses the sludge incineration system in fig. 1 and includes the following steps:
the method comprises the following steps: dividing wet sludge into wet sludge to be dried and wet sludge to be incinerated;
step two: drying wet sludge to be dried by a wet sludge drying module to obtain dry sludge, and collecting fine powder generated in the drying process of the wet sludge by a fine powder collecting device;
step three: the fine powder collected by the fine powder collecting device and the wet sludge in the incineration wet sludge bin 7 are conveyed to the mixing and conveying device 8 to be mixed, and are sent to the incinerator 10 to be incinerated through the first inlet 101 on the incinerator 10.
In this embodiment, the wet sludge is divided into wet sludge to be dried and wet sludge to be incinerated; a drying wet sludge bin 1 is arranged for containing wet sludge to be dried; the wet sludge incineration bin 7 is used for containing wet sludge to be incinerated, and the wet sludge is convenient to store and take. The wet sludge drying module is used for drying wet sludge to be dried to obtain dry sludge, fine powder generated in the wet sludge drying process is collected through the fine powder collecting device, the fine powder generated in the wet sludge drying process is mixed with the wet sludge and then sent to the incinerator 10 to be incinerated, the fine powder can be prevented from being stirred by incineration smoke gas easily after directly entering the incinerator 10, the fine powder is prevented from directly entering the incinerator 10 to cause overheating of the incinerator 10, the phenomena of coking of the incinerator 10 and over-limit of smoke emission indexes are avoided, and therefore the running stability of the incinerator 10 can be improved.
In this embodiment, the fine powder collecting device comprises a fine powder buffer bin 5, the fine powder buffer bin 5 is connected with a fine powder conveying device 6, the fine powder conveying device 6 conveys fine powder to a mixing and conveying device 8, both the fine powder conveying device 6 and the mixing and conveying device 8 are frequency-adjustable conveying devices, and an outlet of the mixing and conveying device 8 is provided with a sludge moisture content detector 9; the third step also comprises: comparing the measured value W1 of the sludge moisture content detector 9 with a set value W0 of the moisture content, and increasing the frequency of the fine powder conveying device 6 or decreasing the frequency of the mixing and conveying device 8 when the measured value W1 of the sludge moisture content detector 9 is greater than the set value W0; when the measured value W1 of the sludge water content detector 9 is smaller than the set value W0, the frequency of the fine powder conveyor 6 is lowered or the frequency of the mixing conveyor 8 is raised.
In this embodiment, as shown in fig. 1, the sludge incineration system further includes a dry sludge conveying device 12 having an input end connected to the drying device 2, the incinerator 10 is further provided with a second inlet, the second inlet is connected to an output end of the dry sludge conveying device 12, and the second step further includes conveying the dry sludge to the incinerator 10 for incineration through the second inlet by using the dry sludge conveying device 12. The mixture of the fine powder and the incinerated wet sludge enters the incinerator 10 through the first inlet 101, and the dry sludge enters the incinerator 10 through the second inlet, so that the adjustment and control can be conveniently carried out according to the condition of the sludge, and the incinerator 10 is efficiently utilized.
In the embodiment, the sludge incineration system comprises a carrier gas treatment device, wherein the fine powder collection device comprises a carrier gas fine powder separation device 4 and a fine powder buffer bin 5, and the carrier gas fine powder separation device 4 is connected to an air outlet to separate carrier gas and fine powder from the drying device; a fine powder buffer bin 5 is positioned at the downstream of the carrier gas fine powder separation device 4 to collect the separated fine powder, the fine powder buffer bin 5 is provided with a material level detection device (not shown in figure 1), the fine powder buffer bin 5 is connected with a fine powder conveying device 6, the fine powder conveying device 6 conveys the fine powder to a mixing and conveying device 8, a carrier gas treatment device (not shown in figure 1) is arranged at a carrier gas outlet of the carrier gas fine powder separation device 4, the lower part of the drying device 2 is provided with an air inlet, one end of the carrier gas treatment device is connected with a carrier gas outlet of the carrier gas fine powder separation device, the other end of the carrier gas treatment device is connected with the air inlet, the second step can also comprise starting the carrier gas treatment device to treat the carrier gas, and then the treated carrier gas enters the drying device 2 through the air inlet arranged at the lower part of the drying device 2, the recycling of the carrier gas is realized, the energy is saved, and the stability of the system is improved by the carrier gas.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (10)
1. A sludge incineration system, characterized in that the sludge incineration system comprises:
the system comprises a wet sludge drying module, a sludge drying module and a sludge drying module, wherein the wet sludge drying module comprises a drying device and a fine powder collecting device, and the drying device is used for drying wet sludge to be dried to obtain dry sludge; the fine powder collecting device is used for collecting fine powder generated in the wet sludge drying process;
the wet sludge incineration module comprises a wet sludge incineration bin, a mixing and conveying device and an incinerator, wherein a first inlet is formed in the incinerator, and the first inlet is connected with the mixing and conveying device;
the fine powder collected by the fine powder collecting device is mixed with wet sludge to be incinerated in the wet sludge incineration bin in the mixing and conveying device, and the mixture enters the incinerator for incineration through the first inlet.
2. The fines collection apparatus of claim 1,
the fine powder collecting device comprises a carrier gas fine powder separating device and a fine powder buffering bin, the upper part of the drying device is provided with an air outlet, and the carrier gas fine powder separating device is connected to the air outlet so as to separate carrier gas and fine powder from the drying device; the fine powder buffer bin is positioned at the downstream of the carrier gas fine powder separation device to collect separated fine powder; the fine powder cache bin is provided with a material level detection device; the fine powder buffer bin is connected with a fine powder conveying device, and the fine powder conveying device conveys fine powder to the mixing conveying device.
3. The sludge incineration system of claim 2, wherein the sludge incineration system comprises a carrier gas treatment device, the lower part of the drying device is provided with a gas inlet, one end of the carrier gas treatment device is connected with the carrier gas fine powder separation device, and the other end of the carrier gas treatment device is connected with the gas inlet.
4. The sludge incineration system of claim 3, wherein the wet sludge drying module further comprises a dried wet sludge bin and a dried wet sludge conveying device, the dried wet sludge conveying device is communicated with the dried wet sludge bin and the drying device, the fine powder conveying device is a bidirectional screw conveyor, one end of the bidirectional screw conveyor is connected with the mixing conveying device, and the other end of the bidirectional screw conveyor is connected with the dried wet sludge conveying device.
5. The sludge incineration system of claim 2, wherein the fine powder conveying device and the mixing conveying device are frequency-adjustable conveying devices, the mixing conveying device outlet is provided with a sludge moisture content detector, and the mixing conveying device is configured to adjust the proportion of the fine powder and the wet sludge according to the measurement value of the sludge moisture content detector.
6. The sludge incineration system of claim 1, further comprising a dry sludge delivery device having an input end connected to the drying device, wherein the incinerator is further provided with a second inlet connected to an output end of the dry sludge delivery device for delivering dry sludge to the incinerator for incineration.
7. The sludge incineration system of claim 6, wherein a dry sludge bin is further connected between the dry sludge delivery device and the second inlet.
8. A sludge incineration method using the sludge incineration system according to any one of claims 1 to 7, comprising the steps of:
the method comprises the following steps: dividing wet sludge into wet sludge to be dried and wet sludge to be incinerated;
step two: drying wet sludge to be dried by a wet sludge drying module to obtain dry sludge, and collecting fine powder generated in the drying process of the wet sludge by a fine powder collecting device;
step three: and conveying the fine powder collected by the fine powder collecting device and the wet sludge to be incinerated in the wet sludge incineration bin into the mixing and conveying device for mixing, and conveying the fine powder and the wet sludge in the wet sludge incineration bin into the incinerator for incineration.
9. The sludge incineration method of claim 8, wherein the fine powder collecting device comprises a fine powder buffer bin, a fine powder conveying device is connected with the fine powder buffer bin, the fine powder conveying device conveys fine powder to the mixing and conveying device, the fine powder conveying device and the mixing and conveying device are both frequency-adjustable conveying devices, and a sludge moisture content detector is arranged at an outlet of the mixing and conveying device; the third step further comprises: comparing the measured value W1 of the sludge water content detector with a water content set value W0, and increasing the frequency of the fine powder conveying device or reducing the frequency of the mixing and conveying device when the measured value W1 of the sludge water content detector is greater than the set value W0; when the measured value W1 of the sludge moisture content detector is less than the set value W0, the frequency of the fine powder conveying device is reduced or the frequency of the mixing and conveying device is increased.
10. The sludge incineration method of claim 8, wherein the sludge incineration system further comprises a dry sludge conveying device with an input end connected with the drying device, the incinerator is further provided with a second inlet connected with an output end of the dry sludge conveying device, and the second step further comprises conveying dry sludge to the incinerator for incineration through the second inlet by using the dry sludge conveying device.
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