CN111473346A - System and method for removing dioxin in waste incineration fly ash in parallel connection with cement clinker production line - Google Patents
System and method for removing dioxin in waste incineration fly ash in parallel connection with cement clinker production line Download PDFInfo
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- CN111473346A CN111473346A CN202010426670.5A CN202010426670A CN111473346A CN 111473346 A CN111473346 A CN 111473346A CN 202010426670 A CN202010426670 A CN 202010426670A CN 111473346 A CN111473346 A CN 111473346A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/47—Cooling ; Waste heat management
- C04B7/475—Cooling ; Waste heat management using the waste heat, e.g. of the cooled clinker, in an other way than by simple heat exchange in the cement production line, e.g. for generating steam
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
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Abstract
The invention relates to a system and a method for removing dioxin in waste incineration fly ash in parallel connection with a cement clinker production line, wherein the system comprises the following components: an atmosphere gas taking point which is positioned at the outlet of the decomposing furnace and before the gas enters the suspension preheater, or at the outlet of the four-stage preheater, or at the position where the tertiary air pipe enters the decomposing furnace; the fly ash degradation dioxin unit is connected with an atmosphere gas taking point at the gas inlet end; the fly ash storage and discharge unit comprises a fly ash storage bin and a fly ash cooling bin; the gas inlet end of the gas conveying unit is connected with the gas outlet end of the fly ash degradation dioxin unit, and the gas outlet end of the gas conveying unit is connected with the kiln head; and (3) flue gas selected from the gas taking point of the atmosphere is sent to a fly ash dioxin degrading unit to degrade dioxin in the fly ash, and then tail gas in the fly ash dioxin degrading unit is conveyed to the kiln head for disposal. The method utilizes the special atmosphere and temperature of the cement production line to treat the dioxin in the fly ash in parallel, has no limit requirement on the content of chloride ions in the fly ash, cannot cause the equipment to be skinned and blocked, and achieves the purpose of thoroughly burning the dioxin which is probably synthesized again in the fly ash and tail gas.
Description
Technical Field
The invention belongs to the technical field of fly ash treatment, and particularly relates to a system and a method for removing dioxin in waste incineration fly ash in parallel connection with a cement clinker production line.
Background
With the rapid increase of the economy of China, the discharge amount of urban domestic garbage in China is also continuously increased, and the problem of the coming-out of urban domestic garbage becomes a major environmental protection subject facing each city in China. The waste incineration power generation is a high-efficiency treatment method which has high harmless degree and large volume reduction and can recover energy to the maximum extent. Heavy metals and dioxin in smoke generated by burning household garbage are purified, more than 98% of the heavy metals and dioxin are trapped in fly ash, and the fly ash generated by burning the garbage is regulated to hazardous waste with the serial number of HW18 in national hazardous waste records. The domestic garbage incineration mainly comprises a fluidized bed and a grate furnace, the treatment capacities of the two furnace types respectively account for 1:2 of domestic garbage in China, the flying ash amount generated by the fluidized bed incinerator is about 15-20% of the mass of garbage entering the incinerator, and the flying ash amount generated by the grate furnace is about 3-5% of the mass of garbage entering the incinerator. The total incineration amount of the garbage reaches 59.14 ten thousand tons/day by the end of 2020, and the flying ash amount generated every year is about 1000 ten thousand tons.
List of hazardous waste exemption management: the household garbage incineration fly ash meets the pollution control standard of cement kiln co-processing solid waste (GB30485-2013), the household garbage incineration fly ash enters a cement kiln for co-processing, and the cement kiln co-processing process is not managed according to hazardous waste. Although the fly ash is put into a high-temperature area of the cement kiln to effectively realize the detoxification of the fly ash, the chlorine content in the fly ash is generally as high as more than 10 percent, and when the cement kiln is directly treated cooperatively, chloride is easy to volatilize in the kiln, returns to a kiln tail smoke chamber, a decomposing furnace and other parts along with smoke gas and is gradually converted into a solid state along with the temperature reduction. Chloride is continuously and circularly reciprocated in a cement kiln system, and is continuously converted in a gas-liquid solid phase, so that the skinning blockage is easily caused. Therefore, if proper measures are not taken, not only the quality of cement cannot be ensured, but also the cement production cannot be normally operated.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a system and a method for removing dioxin in waste incineration fly ash in parallel connection with a cement clinker production line. The method comprises the steps of selecting the temperature suitable for removing dioxin in waste incineration fly ash and the flue gas of a cement kiln through analysis of available waste heat of a cement plant, achieving the purpose of degrading the dioxin by controlling reaction time and temperature, and meanwhile, re-entering tail gas into the kiln for treatment in order to avoid tail gas re-synthesis of the dioxin. The method utilizes the special atmosphere and temperature of the cement production line to treat dioxin in the fly ash in parallel, has no limit requirement on the content of chloride ions in the fly ash compared with the fly ash treated by the cooperation of the cement kiln, and cannot cause crusting and blocking in the cement production process.
The invention is realized in this way, a system for removing dioxin in waste incineration fly ash in parallel connection with a cement clinker production line comprises:
an atmosphere gas taking point of a cement clinker production line, wherein the atmosphere gas taking point of the cement clinker production line is used for selecting cement kiln flue gas suitable for treating fly ash from the cement clinker production line;
the system comprises a fly ash degradation dioxin unit, a fly ash degradation dioxin unit and a gas inlet end, wherein the fly ash degradation dioxin unit is used for removing dioxin in fly ash;
the flying ash storage and unloading unit is connected with the flying ash degradation dioxin unit and comprises a flying ash storage bin for storing and supplying flying ash of the flying ash degradation dioxin unit and a flying ash cooling bin for cooling the flying ash from which the flying ash degradation dioxin unit removes dioxin; the discharge end of the fly ash storage bin is connected with the feed end of the fly ash degradation dioxin unit, and the discharge end of the fly ash degradation dioxin unit is connected with the feed end of the fly ash cooling bin;
the gas conveying unit is used for conveying cement kiln flue gas selected from gas taking points in the cement clinker production line atmosphere to the fly ash degradation dioxin unit and conveying tail gas in the fly ash degradation dioxin unit to the cement kiln head for disposal, the gas inlet end of the gas conveying unit is connected with the gas outlet end of the fly ash degradation dioxin unit, and the gas outlet end of the gas conveying unit is connected with the cement kiln head.
In the above technical solution, preferably, the atmosphere gas taking point of the cement clinker production line is located at the outlet of the decomposing furnace and before the cement clinker enters the suspension preheater, or at the outlet of the four-stage preheater, or at the position where the tertiary air enters the decomposing furnace.
In the above technical scheme, preferably, a cyclone separator is arranged between the fly ash degradation dioxin unit and the cement clinker production line atmosphere gas taking point, an air inlet end of the cyclone separator is connected with the cement clinker production line atmosphere gas taking point, an air outlet end of the cyclone separator is connected with an air inlet end of the fly ash degradation dioxin unit, and a discharge end of the cyclone separator is connected with a decomposing furnace of the cement clinker production line.
In the above technical solution, it is further preferable that a valve for adjusting a flow rate of flue gas is installed on a pipe at a gas inlet end of the cyclone separator.
In the above technical scheme, preferably, a cyclone dust collector is arranged between the fly ash degradation dioxin unit and the gas conveying unit, an air inlet end of the cyclone dust collector is connected with an air outlet end of the fly ash degradation dioxin unit, an air outlet end of the cyclone dust collector is connected with an air inlet end of the gas conveying unit, and a discharge end of the cyclone dust collector is connected with a feed end of the fly ash degradation dioxin unit.
In the above technical scheme, preferably, the fly ash degradation dioxin unit comprises a digestion bin, an air inlet end of the fly ash degradation dioxin unit is located on one side of the bottom of the digestion bin, an air inlet end and an air outlet end of the fly ash degradation dioxin unit are both located on the top of the digestion bin, a discharge end of the fly ash degradation dioxin unit is located on the bottom of the digestion bin, and the stirrer is installed in the digestion bin.
In the above technical solution, it is further preferable that a vibration device is installed at the outer side of the bottom of the digestion bin.
In the above technical scheme, preferably, the gas conveying unit includes a fan, and the fan conveys the flue gas of the cement kiln selected from the gas taking points in the atmosphere of the cement clinker production line into the fly ash dioxin degrading unit and conveys the tail gas of the degraded dioxin in the fly ash degrading dioxin degrading unit into the kiln head of the cement kiln for disposal.
The method for removing dioxin in waste incineration fly ash by adopting the system comprises the following steps:
(1) selecting an atmosphere gas taking point, and taking cement kiln flue gas from the atmosphere gas taking point;
(2) the gas conveying unit conveys the taken cement kiln flue gas into a fly ash degradation dioxin unit, and simultaneously conveys the fly ash in the fly ash storage bin to the fly ash degradation dioxin unit;
(3) heating the fly ash to 350-450 ℃ by introducing the fly ash into the cement kiln flue gas in a fly ash degradation dioxin unit, and preserving heat for 1-3 hours;
(4) and introducing tail gas in the fly ash degradation dioxin unit into a kiln head of the cement kiln through a gas conveying unit for incineration disposal, and discharging the fly ash from which the dioxin is removed in the fly ash degradation dioxin unit to a fly ash cooling bin for cooling.
In the above technical scheme, preferably, the cement kiln flue gas taken out in the step (2) is subjected to gas-solid separation by a cyclone separator, and then the gas enters a fly ash dioxin degradation unit, and the separated solid returns to a decomposing furnace of a cement clinker production line.
The invention has the advantages and positive effects that:
1. the method utilizes the special atmosphere and temperature of the cement production line to treat dioxin in the fly ash in parallel, has no limit requirement on the content of chloride ions in the fly ash compared with the fly ash treated by the cooperation of the cement kiln, and can not cause crusting and blocking of equipment in the cement production process.
2. The aim of degrading the dioxin is achieved by selecting the temperature and the smoke suitable for degrading the dioxin in the waste incineration fly ash and controlling the reaction time and the temperature, and meanwhile, in order to avoid the tail gas from being re-synthesized into the dioxin, the tail gas is re-placed into a kiln for treatment, so that the purpose of thoroughly incinerating the dioxin in the fly ash and the dioxin which is possibly re-synthesized in the tail gas is achieved.
Drawings
FIG. 1 is a flow chart of a system for removing dioxin from fly ash from incineration of refuse connected in parallel to a cement kiln clinker production line according to an embodiment of the present invention;
fig. 2 is a flowchart of a system for removing dioxin from waste incineration fly ash connected in parallel to a cement kiln clinker production line according to a second embodiment of the present invention.
In the figure: 1. a cyclone separator; 2. a digestion bin; 21. a stirrer; 22. a vibrating device; 3. a fly ash cooling bin; 4. a cyclone dust collector; 5. a fan; 6. a decomposing furnace; 7. a kiln head of the cement kiln; 8. a conveyor; 9. and (4) a valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
referring to fig. 1, an embodiment of the present invention provides a system for removing dioxin from fly ash from waste incineration in parallel in a cement clinker production line, including:
an atmosphere gas taking point of a cement clinker production line, wherein the atmosphere gas taking point of the cement clinker production line is used for selecting cement kiln flue gas suitable for treating fly ash from the cement clinker production line; the atmosphere gas taking point of the cement clinker production line is positioned at the outlet of the decomposing furnace and before the cement clinker production line enters the suspension preheater, or at the outlet of the four-stage preheater, or at the position where the tertiary air pipe enters the decomposing furnace.
The fly ash degradation dioxin unit is used for removing dioxin in fly ash, and comprises a digestion bin, wherein a gas inlet end on one side of the bottom of the digestion bin is connected with a gas taking point in the atmosphere of a cement clinker production line, a valve capable of adjusting the flow of flue gas is mounted on a pipeline between the gas taking point in the atmosphere of the cement clinker production line and the gas inlet end of the digestion bin, the flow of the selected flue gas is adjusted in real time according to requirements, a stirrer for stirring the fly ash is arranged in the digestion bin, and the fly ash and the flue gas of a cement kiln are more fully mixed by a gas inlet and the stirrer on one side of the bottom so as to fully degrade the dioxin in the fly ash.
The fly ash storage and discharge unit comprises a fly ash storage bin for storing and supplying fly ash of the fly ash degradation dioxin unit and a fly ash cooling bin for cooling the fly ash from which dioxin is removed by the fly ash degradation dioxin unit; the discharge end of the fly ash storage bin is connected with the top feed end of the digestion bin through a conveyor, and the discharge end of the bottom of the digestion bin is connected with the feed end of the fly ash cooling bin through a conveyor. In this embodiment, clear up the bottom outside in storehouse and install vibrating device, vibrating device is more convenient for unload the flying ash of getting rid of the dioxin in clearing up the storehouse, carries to flying ash cooling bin cooling. The flying ash cooling bin is also internally provided with a stirrer, and the flying ash which is completely removed with dioxin can be cooled more quickly by arranging the stirrer.
The gas conveying unit is used for conveying the cement kiln flue gas selected from the gas taking point of the cement clinker production line atmosphere into the fly ash degradation dioxin unit and conveying the tail gas in the fly ash degradation dioxin unit into the cement kiln head for disposal; the gas conveying unit comprises a fan, cement kiln flue gas selected from a gas taking point in the cement clinker production line atmosphere is conveyed into the fly ash degradation dioxin unit through the fan to degrade fly ash, a cyclone dust collector is arranged between the fan and the digestion bin, a gas inlet end on one side of the top of the cyclone dust collector is connected with a gas outlet end on the top of the digestion bin, a gas outlet end on the top of the cyclone dust collector is connected with a gas inlet end of the fan, a discharge end on the bottom of the cyclone dust collector is connected with a feed end on the top of the digestion bin, and a gas outlet end of the fan is connected with a cement kiln head; tail gas in the fly ash dioxin degradation unit is firstly subjected to dust removal through a cyclone dust collector, so that the fly ash is prevented from being brought into a cement kiln, and then the tail gas is conveyed into a kiln head of the cement kiln through a fan and then is treated, so that the tail gas is prevented from being resynthesized into dioxin.
In the embodiment, the closed valves are arranged on the pipeline close to the gas taking point of the atmosphere of the cement clinker production line and the pipeline of the fly ash degradation dioxin unit connected with the gas conveying unit.
According to the embodiment of the invention, the cement kiln flue gas selected from the gas taking point of the cement clinker production line atmosphere is directly sent into the fly ash dioxin degrading unit without being treated, so that the equipment investment is reduced; on the other hand, the waste of heat is avoided.
Example 2:
different from the embodiment 1, please refer to fig. 1, in this embodiment, a cyclone separator is disposed between the fly ash degradation dioxin unit and the cement clinker production line atmosphere gas taking point, an air inlet end on one side of the top of the cyclone separator is connected with the cement clinker production line atmosphere gas taking point, an air outlet end on the top of the cyclone separator is connected with an air inlet end on one side of the bottom of the digestion bin, and a discharge end on the bottom of the cyclone separator is connected with a decomposition furnace of the cement clinker production line. At this time, the valve capable of adjusting the flue gas flow is positioned on the pipeline at the gas inlet end of the cyclone separator.
According to the embodiment of the invention, the flue gas at the gas taking point of the cement clinker production line is taken gas by the cyclone separator and is subjected to solid-gas separation, and then enters the fly ash degradation dioxin unit, so that on one hand, the power consumption required by gas taking and conveying of the flue gas is reduced, on the other hand, the separated solid returns to the cement kiln decomposition furnace, the reduction of the cement clinker yield and the increase of the solid in the fly ash cooling bin are avoided, and the power consumption generated by stirring and conveying in the fly ash degradation dioxin unit is reduced.
Example 3:
the method for removing dioxin from waste incineration fly ash by using the system in the embodiment 1 comprises the following steps:
(1) selecting an atmosphere gas taking point at the outlet of the cement kiln decomposing furnace before entering the suspension preheater and taking cement kiln flue gas;
(2) directly feeding the taken cement kiln flue gas into a digestion bin, and simultaneously conveying the fly ash in a fly ash storage bin into the digestion bin through a conveyor;
(3) heating the fly ash to 350 ℃ through smoke, and preserving heat for 1.5 hours;
(4) and (3) dedusting tail gas in the fly ash degradation dioxin unit by a cyclone dust collector, introducing the tail gas into a kiln head of a cement kiln by a fan for incineration disposal, discharging the fly ash in a digestion bin after removing dioxin to a fly ash cooling bin by a conveyor for cooling, and stirring while cooling to obtain a finished product.
Example 4:
the method for removing dioxin from waste incineration fly ash by using the system in the embodiment 1 comprises the following steps:
(1) selecting an atmosphere gas taking point at the outlet of a four-stage preheater of the cement kiln and taking cement kiln flue gas;
(2) directly feeding the taken cement kiln flue gas into a digestion bin, and simultaneously conveying the fly ash in a fly ash storage bin into the digestion bin through a conveyor;
(3) heating the fly ash to 400 ℃ through flue gas, and preserving heat for 2 hours;
(4) and (3) dedusting tail gas in the fly ash degradation dioxin unit by a cyclone dust collector, introducing the tail gas into a kiln head of a cement kiln by a fan for incineration disposal, discharging the fly ash in a digestion bin after removing dioxin to a fly ash cooling bin by a conveyor for cooling, and stirring while cooling to obtain a finished product.
Example 5:
the method for removing dioxin from waste incineration fly ash by using the system in the embodiment 1 comprises the following steps:
(1) selecting an atmosphere gas taking point at which a tertiary air pipe of the cement kiln enters the decomposing furnace to take cement kiln flue gas;
(2) directly feeding the taken cement kiln flue gas into a digestion bin, and simultaneously conveying the fly ash in a fly ash storage bin into the digestion bin through a conveyor;
(3) heating the fly ash to 450 ℃ through flue gas, and preserving heat for 1 hour;
(4) and (3) dedusting tail gas in the fly ash degradation dioxin unit by a cyclone dust collector, introducing the tail gas into a kiln head of a cement kiln by a fan for incineration disposal, discharging the fly ash in a digestion bin after removing dioxin to a fly ash cooling bin by a conveyor for cooling, and stirring while cooling to obtain a finished product.
Example 6:
the method for removing dioxin from waste incineration fly ash by using the system of the embodiment 2 comprises the following steps:
(1) selecting an atmosphere gas taking point at the outlet of the cement kiln decomposing furnace before entering the suspension preheater and taking cement kiln flue gas;
(2) the flue gas of the cement kiln enters a cyclone separator through a pipeline for solid-gas separation, the separated solid returns to a decomposing furnace, the gas is introduced into a digestion bin, and meanwhile, the fly ash in a fly ash storage bin is conveyed into the digestion bin through a conveyor;
(3) heating the fly ash to 350 ℃ by gas, and preserving the heat for 1.5 hours;
(4) and (3) dedusting tail gas in the fly ash degradation dioxin unit by a cyclone dust collector, introducing the tail gas into a kiln head of a cement kiln by a fan for incineration disposal, discharging the fly ash in a digestion bin after removing dioxin to a fly ash cooling bin by a conveyor for cooling, and stirring while cooling to obtain a finished product.
Example 7:
the method for removing dioxin from waste incineration fly ash by using the system of the embodiment 2 comprises the following steps:
(1) selecting an atmosphere gas taking point at the outlet of a four-stage preheater of the cement kiln and taking cement kiln flue gas;
(2) the flue gas of the cement kiln enters a cyclone separator through a pipeline for solid-gas separation, the separated solid returns to a decomposing furnace, the gas is introduced into a digestion bin, and meanwhile, the fly ash in a fly ash storage bin is conveyed into the digestion bin through a conveyor;
(3) heating the fly ash to 400 ℃ by gas, and preserving the heat for 2 hours;
(4) and (3) dedusting tail gas in the fly ash degradation dioxin unit by a cyclone dust collector, introducing the tail gas into a kiln head of a cement kiln by a fan for incineration disposal, discharging the fly ash in a digestion bin after removing dioxin to a fly ash cooling bin by a conveyor for cooling, and stirring while cooling to obtain a finished product.
Example 8:
the method for removing dioxin from waste incineration fly ash by using the system of the embodiment 2 comprises the following steps:
(1) selecting an atmosphere gas taking point at which a tertiary air pipe of the cement kiln enters the decomposing furnace to take cement kiln flue gas;
(2) the flue gas of the cement kiln enters a cyclone separator through a pipeline for solid-gas separation, the separated solid returns to a decomposing furnace, the gas is introduced into a digestion bin, and meanwhile, the fly ash in a fly ash storage bin is conveyed into the digestion bin through a conveyor;
(3) heating the fly ash to 450 ℃ by gas, and preserving the heat for 1 hour;
(4) and (3) dedusting tail gas in the fly ash degradation dioxin unit by a cyclone dust collector, introducing the tail gas into a kiln head of a cement kiln by a fan for incineration disposal, discharging the fly ash in a digestion bin after removing dioxin to a fly ash cooling bin by a conveyor for cooling, and stirring while cooling to obtain a finished product.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or some or all of the technical features may be equivalently replaced, and the modifications or the replacements may not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a system for be connected in parallel in cement clinker production line and get rid of dioxin in waste incineration fly ash which characterized in that: the method comprises the following steps:
an atmosphere gas taking point of a cement clinker production line, wherein the atmosphere gas taking point of the cement clinker production line is used for selecting cement kiln flue gas suitable for treating fly ash from the cement clinker production line;
the system comprises a fly ash degradation dioxin unit, a fly ash degradation dioxin unit and a gas inlet end, wherein the fly ash degradation dioxin unit is used for removing dioxin in fly ash;
the flying ash storage and unloading unit is connected with the flying ash degradation dioxin unit and comprises a flying ash storage bin for storing and supplying flying ash of the flying ash degradation dioxin unit and a flying ash cooling bin for cooling the flying ash from which the flying ash degradation dioxin unit removes dioxin; the discharge end of the fly ash storage bin is connected with the feed end of the fly ash degradation dioxin unit, and the discharge end of the fly ash degradation dioxin unit is connected with the feed end of the fly ash cooling bin;
the gas conveying unit is used for conveying the cement kiln flue gas selected from the gas point in the cement clinker production line atmosphere to the fly ash degradation dioxin unit and conveying the tail gas of the degraded dioxin in the fly ash degradation dioxin unit to the cement kiln head for disposal, the gas inlet end of the gas conveying unit is connected with the gas outlet end of the fly ash degradation dioxin unit, and the gas outlet end of the gas conveying unit is connected with the cement kiln head.
2. The system for removing dioxin from fly ash from incineration of waste, connected in parallel to a cement clinker production line as set forth in claim 1, wherein: the gas taking point of the atmosphere of the cement clinker production line is positioned at the outlet of the decomposing furnace and before the gas enters the suspension preheater, or at the outlet of the four-stage preheater, or at the position where the tertiary air pipe enters the decomposing furnace.
3. The system for removing dioxin from fly ash from incineration of waste, connected in parallel to a cement clinker production line as set forth in claim 1, wherein: a cyclone separator is arranged between the fly ash degradation dioxin unit and an atmosphere gas taking point of a cement clinker production line, the gas inlet end of the cyclone separator is connected with the atmosphere gas taking point of the cement clinker production line, the gas outlet end of the cyclone separator is connected with the gas inlet end of the fly ash degradation dioxin unit, and the discharge end of the cyclone separator is connected with a decomposing furnace of the cement clinker production line.
4. The system for removing dioxin from fly ash from incineration of waste connected in parallel to a cement clinker production line as set forth in claim 3, wherein: and a valve capable of adjusting the flow of flue gas is arranged on a pipeline at the gas inlet end of the cyclone separator.
5. The system for removing dioxin from fly ash from incineration of waste, connected in parallel to a cement clinker production line as set forth in claim 1, wherein: a cyclone dust collector is arranged between the fly ash degradation dioxin unit and the gas conveying unit, the gas inlet end of the cyclone dust collector is connected with the gas outlet end of the fly ash degradation dioxin unit, the gas outlet end of the cyclone dust collector is connected with the gas inlet end of the gas conveying unit, and the gas outlet end of the cyclone dust collector is connected with the gas inlet end of the fly ash degradation dioxin unit.
6. The system for removing dioxin from fly ash from incineration of waste, connected in parallel to a cement clinker production line as set forth in claim 1, wherein: the fly ash degradation dioxin unit comprises a digestion bin, the air inlet end of the fly ash degradation dioxin unit is positioned on one side of the bottom of the digestion bin, the material inlet end and the air outlet end of the fly ash degradation dioxin unit are both positioned on the top of the digestion bin, the material outlet end of the fly ash degradation dioxin unit is positioned on the bottom of the digestion bin, and the stirrer is installed in the digestion bin.
7. The system for removing dioxin from fly ash from incineration of waste connected in parallel to a cement clinker production line in accordance with claim 6, wherein: and a vibration device is arranged on the outer side of the bottom of the digestion bin.
8. The system for removing dioxin from fly ash from incineration of waste, connected in parallel to a cement clinker production line as set forth in claim 1, wherein: the gas delivery unit includes a blower.
9. A method for removing dioxins in waste incineration fly ash according to the system of claim 1, comprising the steps of:
(1) selecting an atmosphere gas taking point, and taking cement kiln flue gas from the atmosphere gas taking point;
(2) the gas conveying unit conveys the taken cement kiln flue gas into a fly ash degradation dioxin unit, and simultaneously conveys the fly ash in the fly ash storage bin to the fly ash degradation dioxin unit;
(3) heating the fly ash to 350-450 ℃ by introducing the fly ash into the cement kiln flue gas in a fly ash degradation dioxin unit, and preserving heat for 1-3 hours;
(4) and introducing tail gas in the fly ash degradation dioxin unit into a kiln head of the cement kiln through a gas conveying unit for incineration disposal, and discharging the fly ash from which the dioxin is removed in the fly ash degradation dioxin unit to a fly ash cooling bin for cooling.
10. The method for removing dioxins in fly ash from incineration of waste according to claim 9, wherein: in the step (2), the taken out cement kiln flue gas is subjected to gas-solid separation by a cyclone separator, then the gas enters a fly ash dioxin degradation unit, and the separated solid returns to a decomposing furnace of a cement clinker production line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111943623A (en) * | 2020-08-17 | 2020-11-17 | 北科蕴宏环保科技(北京)有限公司 | Method for low-temperature pyrolysis and resource utilization of household garbage incineration fly ash |
| CN114904898A (en) * | 2022-06-02 | 2022-08-16 | 天津中材工程研究中心有限公司 | System and method for self-enriching dioxin in fly ash |
| CN115010390A (en) * | 2022-06-02 | 2022-09-06 | 天津中材工程研究中心有限公司 | System and method for treating dioxin in fly ash and recycling dioxin |
| CN115488137A (en) * | 2022-09-23 | 2022-12-20 | 重庆三峰环境集团股份有限公司 | System and method for degrading dioxin in waste incineration fly ash |
| CN114877344B (en) * | 2022-06-02 | 2024-06-07 | 天津中材工程研究中心有限公司 | System and method for continuously disposing dioxin in fly ash |
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2020
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111943623A (en) * | 2020-08-17 | 2020-11-17 | 北科蕴宏环保科技(北京)有限公司 | Method for low-temperature pyrolysis and resource utilization of household garbage incineration fly ash |
| CN114904898A (en) * | 2022-06-02 | 2022-08-16 | 天津中材工程研究中心有限公司 | System and method for self-enriching dioxin in fly ash |
| CN115010390A (en) * | 2022-06-02 | 2022-09-06 | 天津中材工程研究中心有限公司 | System and method for treating dioxin in fly ash and recycling dioxin |
| CN114904898B (en) * | 2022-06-02 | 2023-07-04 | 天津中材工程研究中心有限公司 | System and method for self-enriching dioxin in fly ash |
| CN114877344B (en) * | 2022-06-02 | 2024-06-07 | 天津中材工程研究中心有限公司 | System and method for continuously disposing dioxin in fly ash |
| CN115488137A (en) * | 2022-09-23 | 2022-12-20 | 重庆三峰环境集团股份有限公司 | System and method for degrading dioxin in waste incineration fly ash |
| CN115488137B (en) * | 2022-09-23 | 2024-05-28 | 重庆三峰环境集团股份有限公司 | System and method for degrading dioxin in waste incineration fly ash |
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