CN216911502U - Waste incineration fly ash treatment system - Google Patents
Waste incineration fly ash treatment system Download PDFInfo
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- CN216911502U CN216911502U CN202121503494.7U CN202121503494U CN216911502U CN 216911502 U CN216911502 U CN 216911502U CN 202121503494 U CN202121503494 U CN 202121503494U CN 216911502 U CN216911502 U CN 216911502U
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- 238000004056 waste incineration Methods 0.000 title claims abstract description 33
- 238000010438 heat treatment Methods 0.000 claims abstract description 106
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 25
- 150000003839 salts Chemical class 0.000 claims abstract description 23
- 229910001385 heavy metal Inorganic materials 0.000 claims abstract description 22
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- 239000002184 metal Substances 0.000 claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 10
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- 238000001816 cooling Methods 0.000 claims description 18
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- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 1
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- 229910052757 nitrogen Inorganic materials 0.000 description 1
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- 230000003647 oxidation Effects 0.000 description 1
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Images
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Processing Of Solid Wastes (AREA)
Abstract
The utility model relates to the technical field of waste treatment and recovery, and discloses a waste incineration fly ash treatment system and method. The fly ash treatment system comprises a segmented rotary furnace and an anaerobic feeder, wherein the segmented rotary furnace comprises a first heating section, a second heating section and a third heating section which are sequentially communicated, the anaerobic feeder is communicated with the first heating section, a first reducing agent feeder is arranged at the position, close to the anaerobic feeder, of the first heating section, and a low-melting-point metal recoverer is arranged at the end part, close to the second heating section, of the first heating section; a salt recoverer is arranged at the end part of the second heating section close to the third heating section; a second reducing agent feeder is arranged at the position, close to the second heating section, of the third heating section, and a heavy metal recoverer is arranged at the end, far away from the second heating section, of the third heating section. The method can recover metal, salt and heavy metal in the fly ash, and the fly ash after being attenuated can be used as environment-friendly aggregate.
Description
Technical Field
The utility model relates to the technical field of waste treatment and recovery, in particular to a waste incineration fly ash treatment system.
Background
The waste incineration is a process of subjecting waste to oxidation at a high temperature by appropriate thermal decomposition, combustion, melting, or other reaction to reduce the volume of the waste to form a residue or a molten solid substance. In order to utilize the heat generated by burning garbage, the heat generated by burning garbage is generally used to generate electricity.
Incineration fly ash of a waste incineration power plant has more substances harmful to the environment. Researchers carry out particle size grading toxicity analysis research on incineration fly ash of a certain waste incineration power plant. Mainly researches the corrosivity and short-term leaching toxicity of the fly ash with the particle size of 35-1000 mu m, and the results show that the fly ash comprises heavy metals such as Cr, Cd, Mg, Pb, Mn, Fe, Cu, Zn, Ni and Co, and SO2 4-，Cl-，NO3N and NO2-N. Meanwhile, the material composition and mineral characteristics of the fly ash are researched, and research results show that the pH value of leachate of the fly ash with all particle sizes is 12.3-12.5, the fly ash belongs to corrosive dangerous waste, and the leaching concentrations of heavy metals Mg, Pb and Zn are 168.78, 53.94 and 86.40Mg/L respectively. The highest content of the fly ash leachate reaches 8.87g/L and the highest content of the fly ash leachate reaches 1.38g/L respectively, and a certain amount of nitrate nitrogen and nitrite nitrogen are measured in the leachate, so that the fact that the fly ash adsorbs nitrogen oxide gas generated in the waste incineration process is proved. In addition, the basic elements of fly ash are Ca, Si, Cl, K, Na, S, Al, Mg and Fe, while the heavy metals are mainly Zn, Pb, Mn, Cu, Cr, etc. The mineral phase mainly comprises compounds containing silicon and calcium and chlorides such as NaCl, KCl and the like.
Based on the above results, it is found that if fly ash can be treated to recover useful substances and reduce the toxicity thereof, valuable utilization of fly ash can be achieved and economic benefits are increased.
In view of this, the present application is specifically made.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a waste incineration fly ash treatment system which can treat the fly ash and realize resource recycling.
Embodiments of the utility model may be implemented as follows:
the utility model provides a waste incineration fly ash treatment system, which comprises a sectional rotary furnace and an anaerobic feeder,
the segmented rotary furnace comprises a first heating section, a second heating section and a third heating section which are sequentially communicated, the anaerobic feeder is communicated with the first heating section, a first reducing agent feeder is arranged at the position, close to the anaerobic feeder, of the first heating section, and a low-melting-point metal recoverer is arranged at the end part, close to the second heating section, of the first heating section; a salt recoverer is arranged at the end part of the second heating section close to the third heating section; a second reducing agent feeder is arranged at the part, close to the second heating section, of the third heating section, and a heavy metal recoverer is arranged at the end, far away from the second heating section, of the third heating section.
In an optional embodiment, the waste incineration fly ash treatment system further comprises a storage tank and a cooling system, wherein one end of the third heating section, which is far away from the second heating section, is communicated with the storage tank, and the cooling system is communicated with the lower part of the storage tank.
In an optional embodiment, the waste incineration fly ash treatment system further comprises an anaerobic discharge device, and the anaerobic discharge device is communicated with the discharge end of the cooling system.
In an alternative embodiment, the waste incineration fly ash treatment system further comprises a storage tank, and the upper part of the storage tank is communicated with the dust remover.
In an alternative embodiment, the waste incineration fly ash treatment system further comprises a gas treatment system in communication with the dust separator.
In an alternative embodiment, the gas treatment system comprises a gas water washing tower, and a gas outlet of the gas water washing tower is sequentially communicated with a gas condenser, a supersonic speed processor, a photo-oxygen processor, a plasma processor and an electrostatic processor.
In an alternative embodiment, the washing liquid outlet of the gas water washing tower is communicated with the filter, the electrolytic cell and the salt recovery system in sequence.
The beneficial effects of the embodiment of the utility model include, for example:
the waste incineration fly ash treatment system is characterized in that the segmented rotary furnace is arranged in a segmented heating mode, and the oxygen-free feeder and the specific arrangement of each recoverer are matched, so that after the treatment system sets reasonable heating temperature at each heating segment in the segmented heating furnace, metal, salt and heavy metal in fly ash can be recovered, the toxicity of the fly ash is removed or greatly weakened, and the attenuated fly ash can be used as environment-friendly aggregate. The system can realize the reuse of the waste, so that the waste generates economic value.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic structural diagram of a fly ash treatment system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a gas treatment system of the fly ash treatment system according to an embodiment of the present invention.
Icon: 100-a fly ash treatment system; 101-a fly ash closed storage box; 110-a segmented rotary furnace; 111-a first heating stage; 112-a second heating section; 113-a third heating section; 114-a first reductant doser; 115-a second reductant doser; 116-low melting point metal recoverer; 117-salt reclaimer; 118-heavy metal recoverer; 120-oxygen free feeder; 130-a storage bin; 140-a cooling system; 150-oxygen free discharge; 160-a dust remover; 170-a gas treatment system; 171-gas water washing column; 172-gas condenser; 173-a supersonic processor; 174-photo-oxygen processor; 175-a plasma processor; 176-an electrostatic processor; 177-a filter; 178-an electrolytic cell; 179-salt recovery System.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the utility model is used, it is only for convenience of describing the present invention and simplifying the description, but it is not necessary to indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation and be operated, and thus, it should not be construed as limiting the present invention.
Furthermore, the appearances of the terms "first," "second," and the like, if any, are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
It should be noted that the features of the embodiments of the present invention may be combined with each other without conflict.
Referring to fig. 1 and 2, the present embodiment provides a waste incineration fly ash treatment system 100, which includes a segment rotary kiln 110 and an oxygen-free feeder 120.
The segmented rotary furnace 110 comprises a first heating section 111, a second heating section 112 and a third heating section 113 which are sequentially communicated, an oxygen-free feeder 120 is communicated with the first heating section 111, a first reducing agent feeder 114 is arranged at the position, close to the oxygen-free feeder 120, of the first heating section 111, and a low-melting-point metal recoverer 116 is arranged at the end part, close to the second heating section 112, of the first heating section 111; a salt recoverer 117 is arranged at the end part of the second heating section 112 close to the third heating section 113; a second reducing agent feeder 115 is arranged at the position, close to the second heating section 112, of the third heating section 113, and a heavy metal recoverer 118 is arranged at the end, far away from the second heating section 112, of the third heating section 113.
Fly ash generated by a household garbage incineration power plant is stored in a fly ash sealed storage box 101 and is communicated with an anaerobic feeder 120, the fly ash is continuously fed into a sectional rotary furnace 110 under the action of the anaerobic feeder 120, the heating temperature of a first heating section 111 is controlled to be 310-330 ℃, the heating temperature of a second heating section 112 is controlled to be 850-950 ℃, the heating temperature of a third heating section 113 is controlled to be 1150-1250 ℃, low-melting-point metals in the fly ash are reduced under the action of a reducing agent added by a first reducing agent adder 114 when the fly ash enters the first heating section 111, the low-melting-point metals such as tin, lead and the like are melted into liquid, and the low-melting-point metals are recovered by a low-melting-point metal recoverer 116. Most of the salt in the fly ash begins to melt after the fly ash enters the second heating section 112, and the liquid salt is recovered through a salt recoverer 117. After the fly ash enters the third heating section 113, heavy metals are reduced under the action of heavy metal reducing agents added by the second reducing agent adding device 115, then are melted into liquid at high temperature, and finally are recovered by the heavy metal recoverer 118.
The fly ash generated by the household garbage incineration power plant is treated by the garbage incineration fly ash treatment system provided by the embodiment, the metal and salt in the fly ash are recovered, the toxicity is reduced, and the treated fly ash can be used as an environment-friendly aggregate to realize the recycling of resources.
The reductor feeders are all oxygen-free feeders 120; the low melting point metal recoverer 116, the salt recoverer 117, and the heavy metal recoverer 118 are configured to be mounted on a furnace body and to collect liquid generated during a heating process. Reducing agents such as activated carbon and the like are added to first reducing agent feeder 114 and second reducing agent feeder 115.
Further, the waste incineration fly ash treatment system further comprises a storage tank 130 and a cooling system 140, wherein one end of the third heating section 113, which is far away from the second heating section 112, is communicated with the storage tank 130, and the cooling system 140 is communicated with the lower part of the storage tank 130.
The cooling system 140 cools the treated high-temperature fly ash generated by the segmented rotary kiln 110 to normal temperature under the action of the cooling system 140.
In this embodiment, the cooling system 140 may cool the treated fly ash by water cooling, and the cooling water of the cooling system 140 serves as a cold source to lower the temperature of the fly ash and raise the temperature thereof during the process of cooling the fly ash.
Preferably, the waste incineration fly ash treatment system further comprises an anaerobic discharge device 150, and the anaerobic discharge device 150 is communicated with the discharge end of the cooling system 140.
The fly ash cooled to normal temperature is discharged by the anaerobic discharge device 150, and the oxygen entering the segmented rotary furnace 110 in the discharging process can be prevented from influencing the treatment effect by adopting the discharge of the anaerobic discharge device 150. The discharged treated fly ash is basically removed of salt and metal, and can be used as an environment-friendly aggregate to realize the recycling of resources.
Further, the waste incineration fly ash treatment system further comprises a storage tank 130, and the upper part of the storage tank 130 is communicated with the dust remover 160.
The treated fly ash is subjected to the action of the dust collector 160, wherein the gas is discharged and the solids are retained in the storage bin 130.
Further, the waste incineration fly ash disposal system further includes a gas disposal system 170 in communication with the dust collector 160.
The gas discharged from the storage tank 130 contains gases harmful to the environment, such as sulfur-containing gases and nitrogen-containing gases, and thus, needs to be treated by the gas treatment system 170 before being discharged into the atmosphere.
Preferably, the gas treatment system 170 comprises a gas water scrubber 171, and a gas outlet of the gas water scrubber 171 is sequentially communicated with a gas condenser 172, a supersonic processor 173, a photo-oxygen processor 174, a plasma processor 175 and an electrostatic processor 176.
The high-temperature gas is washed by a water scrubber to remove substances such as sulfur, nitrogen and the like in the gas; the gas after washing is rapidly cooled (to below 200 ℃ within 2 seconds) through a gas condenser 172 to prevent the decomposed dioxin from being synthesized again; the cooled gas enters a supersonic processor 173 to remove substances such as moisture, grease and the like contained in the gas; then the gas enters a photo-oxygen processor 174, and the photo-oxygen processor 174 carries out photo-oxygen catalytic treatment; then the gas enters a plasma processor 175 for plasma processing; finally, the gas enters an electrostatic processor 176 for electrostatic treatment; harmful substances in the gas after electrostatic treatment are basically removed completely, and the gas meets the emission standard.
Preferably, the washing liquid outlet of the gas water washing column 171 is communicated with a filter 177, an electrolytic cell 178 and a salt recovery system 179 in sequence.
The washing liquid in the washing tower adsorbs soluble harmful substances in the gas discharged from the rotary kiln 110, so that the gas needs to be treated before being discharged or recycled. The washing liquid is filtered by a filter 177 to remove impurities, then enters an electrolytic cell 178 to remove heavy metals possibly existing in the washing liquid by electrolysis, and the water treated by the electrolytic cell 178 enters a salt recovery system 179 to be desalted and softened. The water treated by the salt recovery system 179 meets the discharge requirements.
Preferably, the drain of the salt recovery system 179 is in communication with the condensate inlet of the cooling system 140.
The treated water reaching the standard can be used as condensed water of a cooling system 140, so that resource recycling is realized.
The embodiment of the application also provides a waste incineration fly ash treatment method, the waste incineration fly ash treatment system provided by the embodiment of the application is adopted to treat fly ash generated by a domestic waste incineration power plant, the heating temperature of the first heating section 111 is 320-330 ℃, the heating temperature of the second heating section 112 is 850-950 ℃, and the heating temperature of the third heating section 113 is 1150-1250 ℃.
Preferably, the heating temperature of the first heating section 111 is 315-325 ℃, the heating temperature of the second heating section 112 is 890-910 ℃, and the heating temperature of the third heating section 113 is 1180-1220 ℃. More specifically, the heating temperature of the first heating section 111 is generally controlled to 320 ℃, the heating temperature of the second heating section 112 is controlled to 900 ℃, and the heating temperature of the third heating section 113 is controlled to 1200 ℃.
The fly ash is continuously fed into the segmented rotary kiln 110 under the action of the oxygen-free feeder 120, when the fly ash enters the first heating section 111, the low-melting-point metals in the fly ash are reduced under the action of the reducing agent added by the first reducing agent adder 114, and the low-melting-point metals such as tin, lead and the like are melted into liquid and are recovered by the low-melting-point metal recoverer 116. Most of the salt in the fly ash begins to melt after the fly ash enters the second heating section 112, and the liquid salt is recovered by the salt reclaimer 117. After the fly ash enters the third heating section 113, heavy metals are reduced under the action of heavy metal reducing agents added by the second reducing agent adding device 115, then are melted into liquid at high temperature, and finally are recovered by the heavy metal recoverer 118.
It is further preferred that the reducing agent added in the first and second reducing agent feeders 114 and 115 comprises activated carbon for reducing the metal ions in the fly ash. The second reductant adding unit 115 is used to add heavy metal reductant to reduce heavy metal ions in the fly ash.
In summary, the waste incineration fly ash treatment system provided by the utility model has the advantages that due to the sectional heating arrangement of the sectional rotary furnace and the specific arrangement of the oxygen-free feeder and each recoverer, after the treatment system sets reasonable heating temperature at each heating section in the sectional heating furnace, metal, salt and heavy metal in the fly ash can be recovered, the toxicity of the fly ash is removed or greatly weakened, and the attenuated fly ash can be used as environment-friendly aggregate. The system can realize the reuse of the waste, so that the waste generates economic value.
The method for treating the fly ash from the waste incineration adopts the system for treating the fly ash from the waste incineration provided by the utility model, and sets the heating temperature of the first heating section to be 320-330 ℃, the heating temperature of the second heating section to be 850-950 ℃ and the heating temperature of the third heating section to be 1150-1250 ℃, so that the recovery of metal, salt and heavy metal in the fly ash can be realized, the toxicity of the fly ash can be removed or greatly weakened, and the attenuated fly ash can be used as environment-friendly aggregate to realize the reutilization of incineration ash.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. A waste incineration fly ash treatment system is characterized by comprising a sectional rotary furnace and an oxygen-free feeder,
the segmented rotary furnace comprises a first heating section, a second heating section and a third heating section which are sequentially communicated, the anaerobic feeder is communicated with the first heating section, a first reducing agent feeder is arranged at the position, close to the anaerobic feeder, of the first heating section, and a low-melting-point metal recoverer is arranged at the end part, close to the second heating section, of the first heating section; a salt recoverer is arranged at the end part of the second heating section close to the third heating section; and a second reducing agent feeder is arranged at the position, close to the second heating section, of the third heating section, and a heavy metal recoverer is arranged at the end, far away from the second heating section, of the third heating section.
2. The waste incineration fly ash treatment system of claim 1, further comprising a storage bin and a cooling system, wherein an end of the third heating section remote from the second heating section is in communication with the storage bin, and the cooling system is in communication with a lower portion of the storage bin.
3. The waste incineration fly ash treatment system of claim 2, further comprising an oxygen-free discharge device in communication with a discharge end of the cooling system.
4. The waste incineration fly ash treatment system according to any one of claims 1 to 3, further comprising a storage tank, wherein an upper portion of the storage tank is communicated with the dust collector.
5. The waste incineration fly ash treatment system according to claim 4, further comprising a gas treatment system in communication with the dust collector.
6. The waste incineration fly ash treatment system according to claim 5, wherein the gas treatment system comprises a gas washing tower, and a gas outlet of the gas washing tower is communicated with a gas condenser, a supersonic processor, a photo-oxygen processor, a plasma processor and an electrostatic processor in sequence.
7. The waste incineration fly ash treatment system according to claim 6, wherein the washing liquid outlet of the gas washing tower is sequentially communicated with a filter, an electrolytic cell and a salt recovery system.
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| CN202121503494.7U CN216911502U (en) | 2021-06-29 | 2021-06-29 | Waste incineration fly ash treatment system |
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| CN202121503494.7U CN216911502U (en) | 2021-06-29 | 2021-06-29 | Waste incineration fly ash treatment system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113245354A (en) * | 2021-06-29 | 2021-08-13 | 北京灵娲太昊环保科技研究院有限公司 | Waste incineration fly ash treatment system and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113245354A (en) * | 2021-06-29 | 2021-08-13 | 北京灵娲太昊环保科技研究院有限公司 | Waste incineration fly ash treatment system and method |
| CN113245354B (en) * | 2021-06-29 | 2025-02-28 | 北京灵娲太昊环保科技研究院有限公司 | Waste incineration fly ash treatment system and method |
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