CN112696699A - System and method for co-processing hazardous waste incineration residue and fly ash - Google Patents
System and method for co-processing hazardous waste incineration residue and fly ash Download PDFInfo
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- CN112696699A CN112696699A CN202011580889.7A CN202011580889A CN112696699A CN 112696699 A CN112696699 A CN 112696699A CN 202011580889 A CN202011580889 A CN 202011580889A CN 112696699 A CN112696699 A CN 112696699A
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- flue gas
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- slag
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- 239000010881 fly ash Substances 0.000 title claims abstract description 72
- 239000002920 hazardous waste Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004056 waste incineration Methods 0.000 title claims abstract description 26
- 239000003546 flue gas Substances 0.000 claims abstract description 95
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000002893 slag Substances 0.000 claims abstract description 87
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 56
- 238000005406 washing Methods 0.000 claims abstract description 42
- 239000002956 ash Substances 0.000 claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052742 iron Inorganic materials 0.000 claims abstract description 28
- 238000000926 separation method Methods 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 27
- 238000002347 injection Methods 0.000 claims abstract description 20
- 239000007924 injection Substances 0.000 claims abstract description 20
- 239000000779 smoke Substances 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 16
- 239000000428 dust Substances 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 239000002351 wastewater Substances 0.000 claims description 24
- 238000010791 quenching Methods 0.000 claims description 13
- 230000000171 quenching effect Effects 0.000 claims description 13
- 239000000126 substance Substances 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 10
- 239000004570 mortar (masonry) Substances 0.000 claims description 10
- 238000010409 ironing Methods 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000000746 purification Methods 0.000 claims description 5
- 238000005200 wet scrubbing Methods 0.000 claims description 3
- 239000013049 sediment Substances 0.000 claims description 2
- 235000019504 cigarettes Nutrition 0.000 claims 2
- 230000008901 benefit Effects 0.000 abstract description 10
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 150000003839 salts Chemical class 0.000 description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 7
- 229910052801 chlorine Inorganic materials 0.000 description 7
- 239000000460 chlorine Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- 238000004939 coking Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PXGOKWXKJXAPGV-UHFFFAOYSA-N Fluorine Chemical compound FF PXGOKWXKJXAPGV-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J1/00—Removing ash, clinker, or slag from combustion chambers
- F23J1/06—Mechanically-operated devices, e.g. clinker pushers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/022—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
- F23J15/025—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
- F23J15/04—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/14—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects using gases or vapours other than air or steam, e.g. inert gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/003—Ash removal means for incinerators
Abstract
The invention discloses a hazardous waste incineration residue and fly ash cooperative treatment system and a method, which comprises a combustion device, wherein the cooperative treatment system comprises a magnetic iron remover, a bottom slag crusher, an ash stirring mixer and a flue gas dryer which are sequentially connected, and an active carbon injection device, a bag-type dust remover, a wet washing tower, a secondary washing device and a centrifugal separation device which are sequentially connected, wherein the magnetic iron remover is communicated with a solid outlet of the combustion device, a smoke inlet of the flue gas dryer is communicated with a smoke outlet of the combustion device, the magnetic iron remover is communicated with the solid outlet of the combustion device, the active carbon injection device is communicated with the smoke outlet of the flue gas dryer, and the centrifugal separation device is connected with the ash stirring mixer. The invention has simple structure and low cost, can further reduce the treatment amount of the bottom slag and the fly ash of the hazardous waste incineration, provides support for the resource utilization of the hazardous waste incineration ash slag, and has good economic benefit, social benefit and environmental benefit.
Description
Technical Field
The invention belongs to the technical field of hazardous waste clean incineration disposal, and particularly relates to a system and a method for cooperatively disposing hazardous waste incineration residues and fly ash.
Background
The hazardous waste is listed in a national hazardous waste list or is identified by a national hazardous waste identification standard and identification method and has one or more hazardous characteristics of corrosivity, toxicity, flammability, reactivity, infectivity and the like, and the hazardous waste incineration disposal is a common harmless, reduced and resource disposal method; the rotary kiln is the mainstream technology of dangerous waste incineration at present, and has the advantages of wide material application, high automation degree, low pollutant discharge and the like. In the process of hazardous waste incineration treatment, the water-sealed scraper slag extractor is one of the important main components in the incinerator, generates incineration bottom slag, and is a common equipment technology at present. The fly ash is the ash generated by the sedimentation of the flue gas generated in the incineration process by the flue gas dust removal equipment, and the fly ash generated by the incineration of hazardous waste mainly comes from a bag-type dust remover.
Because most hazardous wastes contain higher chlorine, fluorine and other substances, the bottom slag after incineration has high water content and high-concentration organic substances, and the fly ash of the bag-type dust remover has the characteristic of high salt content, so that the bottom slag and the fly ash after incineration of the hazardous wastes are difficult to recycle, and the requirements that the water content of the hazardous wastes for landfill in a flexible landfill site is lower than 60 percent and the total amount of soluble salt is less than 10 percent cannot be met. Therefore, the disposal of the incineration bottom slag and fly ash of the hazardous waste with high salt content is the biggest problem of the incineration disposal of the hazardous waste.
Therefore, under the background, the method for researching, developing, popularizing and applying the high-moisture-content residue and high-salt-content fly ash incinerated by the hazardous waste with the independent property rights has important significance.
Invention container
The invention aims to solve the problems of high salt content, agglomeration and water content of fly ash in the conventional hazardous waste incineration disposal system, waste of flue gas energy and the like, and provides a system and a method for reducing and harmlessly disposing hazardous waste incineration bottom slag and fly ash.
The invention discloses a hazardous waste incineration residue and fly ash cooperative treatment system which comprises a combustion device, wherein the cooperative treatment system comprises a magnetic iron remover, a bottom slag crusher, an ash stirring mixer and a flue gas dryer which are sequentially connected, and an active carbon injection device, a bag-type dust remover, a wet washing tower, a secondary washing device and a centrifugal separation device which are sequentially connected, wherein the magnetic iron remover is communicated with a solid outlet of the combustion device, a smoke inlet of the flue gas dryer is communicated with a smoke outlet of the combustion device, the magnetic iron remover is communicated with the solid outlet of the combustion device, the active carbon injection device is communicated with a smoke outlet of the flue gas dryer, and the centrifugal separation device is connected with the ash stirring mixer.
Preferably, the smoke inlet of the smoke dryer is communicated with the smoke outlet of the combustion device through a smoke quenching device, the activated carbon injection device is connected, and the activated carbon injection device is communicated with the smoke quenching device.
Preferably, the centrifugal separation device is also connected with an ash stirring mixer.
Preferably, the magnetic iron remover is connected with a solid outlet of the second combustion chamber through a water-sealed slag extractor.
Preferably, the combustion device is a secondary combustion chamber.
Preferably, the flue gas dryer comprises a low temperature belt dryer and a drum flue gas dryer.
Preferably, the water outlet of the centrifugal separation device is also connected with a waste water system.
A method for cooperatively treating hazardous waste incineration residue and fly ash comprises the following steps:
the method comprises the following steps: the incineration residues in the combustion device are washed by water through a water-sealed slag extractor, a magnetic iron remover and a bottom slag crusher in sequence, iron-containing substances in the bottom slag are removed, and the bottom slag is crushed to obtain uniform and fine incineration bottom slag;
step two: cooling the flue gas in the combustion device through a flue gas quenching device, then feeding the cooled flue gas into a flue gas dryer, feeding the burnt bottom slag into an ash slag stirring mixer, uniformly mixing the burnt bottom slag with water-washed fly ash, and then feeding the mixture into the flue gas dryer for separation to obtain dry ash slag, wherein the temperature of the flue gas in the flue gas dryer is 160-240 ℃;
step three: after entering an activated carbon injection device for flue gas purification, the flue gas sequentially enters a bag-type dust collector and a wet washing tower to obtain fly ash and deacidification wastewater;
step four: and (2) performing secondary washing on the fly ash and the deacidified wastewater in a secondary washing device, mixing the mass volume ratio (g/ml) of solid and liquid in washing according to the proportion of 1:4-1:10, strongly stirring and washing for 30 minutes to form mortar, performing solid-liquid separation on the mortar through a centrifugal separation device to obtain a low-salt-content wastewater system and washing fly ash, and feeding the washing fly ash into an ash stirring mixer in the step two.
The invention has the beneficial effects that:
1. the magnetic iron remover, the bottom slag crusher and the ash stirring mixer with the vibration function effectively solve the problems of high water content, high iron-containing substances, large coking caking particles and the like of the water-sealed slag extractor. Meanwhile, a flue gas dryer is adopted, and the weight of incineration ash and washing fly ash is further reduced by fully utilizing the heat of low-grade waste heat flue gas.
2. The fly ash and the deacidification wastewater are subjected to twice mixed water washing, so that the weight and the salt content of the original fly ash are obviously reduced, and the deacidification wastewater is utilized instead of redundant water, so that the problems that the fly ash has high salt content and the deacidification wastewater is recycled are effectively solved, and the problems that the fly ash cannot be flexibly buried and further recycled at present are solved.
3. The fly ash and the deacidification wastewater in the invention are wastes generated by an incineration system, the system energy consumption is derived from the low-grade flue gas waste heat in the incineration system, the incineration system is not influenced, and the problems of high water content of bottom slag, high salt content of the fly ash and waste heat utilization are solved. The system runs stably and has obvious effect in actual engineering operation.
4. The invention has simple structure and low cost, can further reduce the treatment amount of the bottom slag and the fly ash of the hazardous waste incineration, provides support for the resource utilization of the hazardous waste incineration ash slag, and has good economic benefit, social benefit and environmental benefit.
Drawings
FIG. 1 is a schematic view of the structure of the present invention
In the figure: 1-a second combustion chamber; 2-water seal type slag discharging machine; 3-magnetic iron remover; 4-a bottom slag crusher; 5-ash stirring mixer; 6-flue gas dryer; 7-flue gas quenching device; 8-an activated carbon injection device; 9-bag dust collector; 10-a wet scrubbing tower; 11-a secondary water washing device; 12-a centrifugal separation device; 13-wastewater system.
Detailed Description
For further understanding of the present invention, the present invention will be described in detail with reference to examples, which are provided for illustration of the present invention but are not intended to limit the scope of the present invention.
Example 1
As shown in fig. 1, this embodiment discloses a dangerous useless incineration residue and flying ash coprocessing system, including two combustion chambers 1, coprocessing system including the magnetic type de-ironing separator 3, end sediment breaker 4, lime-ash stirring blender 5 and the flue gas desicator 6 that connect gradually, active carbon injection apparatus 8, sack cleaner 9, wet scrubbing tower 10, second grade washing unit 11 and the centrifugal separation device 12 that connect gradually, magnetic type de-ironing separator 3 and the solid outlet intercommunication of two combustion chambers 1, the smoke inlet of flue gas desicator 6 communicates with the outlet flue of two combustion chambers 1, magnetic type de-ironing separator 3 communicates with the solid outlet of two combustion chambers 1, active carbon injection apparatus 8 communicates with the outlet flue of flue gas desicator 6, centrifugal separation device 12 is connected with lime-ash stirring blender 5.
The flue gas inlet of the flue gas dryer 6 is communicated with the flue gas outlet of the secondary combustion chamber 1 through a flue gas quenching device 7, the activated carbon injection device 8 is communicated with the flue gas quenching device 7, a valve is arranged on a flue pipe between the flue gas quenching device 7 and the activated carbon injection device 8, the amount of flue gas entering the flue gas dryer 6 is controlled, the drying effect is improved, and redundant flue gas and the flue gas entering the flue gas dryer 6 for drying enter the activated carbon injection device 8 together.
The magnetic iron remover 3 is connected with a solid outlet of the secondary combustion chamber 1 through a water-sealed slag discharging machine 2, and ash in the secondary combustion chamber 1 is discharged through the water-sealed slag discharging machine 2. The flue gas dryer 6 comprises a low-temperature belt dryer and a roller flue gas dryer, and the water outlet of the centrifugal separation device 12 is connected with a waste water system 13.
The invention has simple structure and low cost, can further reduce the treatment amount of the bottom slag and the fly ash of the hazardous waste incineration, provides support for the resource utilization of the hazardous waste incineration ash slag, and has good economic benefit, social benefit and environmental benefit.
Example 2
As shown in fig. 1, the present embodiment relates to a method for co-processing hazardous waste incineration residue and fly ash, wherein the chlorine content of the fly ash is 10.7%, and the method includes the following steps:
the method comprises the following steps: the incineration residues in the combustion device are washed by water through a water-sealed slag extractor, a magnetic iron remover and a bottom slag crusher in sequence, iron-containing substances in the bottom slag are removed, and the bottom slag is crushed to obtain uniform and fine incineration bottom slag;
step two: cooling flue gas in a combustion device through a flue gas quenching device, then feeding the cooled flue gas into a flue gas dryer, feeding incineration bottom slag into an ash slag stirring mixer, uniformly mixing the incineration bottom slag with water-washed fly ash, and then feeding the mixture into the flue gas dryer for separation to obtain dry ash slag, wherein the temperature of the flue gas in the flue gas dryer is 200 ℃, and the temperature of the flue gas discharged from the flue gas dryer is 180 ℃;
step three: after entering an activated carbon injection device for flue gas purification, the flue gas sequentially enters a bag-type dust collector and a wet washing tower to obtain fly ash and deacidification wastewater;
step four: and (2) performing secondary washing on the fly ash and the deacidified wastewater in a secondary washing device, mixing the mass volume ratio (g/ml) of solid to liquid in washing according to a ratio of 1:10, strongly stirring and washing for 30 minutes to form mortar, performing solid-liquid separation on the mortar through a centrifugal separation device to obtain a low-salt-content wastewater system and washed fly ash, and feeding the washed fly ash into an ash stirring mixer in the step two, wherein the chlorine content in the fly ash is reduced to 3.5% from 10.7%, and the weight of the fly ash is reduced by 46%.
The magnetic iron remover, the bottom slag crusher and the ash and slag stirring mixer in the process well solve the problems of iron-containing substances, coking blocks and the like of the bottom slag, obtain uniform incineration bottom slag, and reduce the water content of the incineration bottom slag to 30 percent. The water content of the dry ash residue is reduced to 5% after the incineration bottom slag and the washing fly ash are dried by the flue gas of the incineration system in a flue gas dryer, and the water content is obviously reduced.
Example 3
As shown in fig. 1, the present embodiment relates to a method for co-processing hazardous waste incineration residue and fly ash, wherein the chlorine content of the fly ash is 11.5%, and the method includes the following steps:
the method comprises the following steps: the incineration residues in the combustion device are washed by water through a water-sealed slag extractor, a magnetic iron remover and a bottom slag crusher in sequence, iron-containing substances in the bottom slag are removed, and the bottom slag is crushed to obtain uniform and fine incineration bottom slag;
step two: cooling flue gas in a combustion device through a flue gas quenching device, then feeding the cooled flue gas into a flue gas dryer, feeding incineration bottom slag into an ash slag stirring mixer, uniformly mixing the incineration bottom slag with water-washed fly ash, and then feeding the mixture into the flue gas dryer for separation to obtain dry ash slag, wherein the temperature of the flue gas in the flue gas dryer is 160 ℃, and the temperature of the flue gas discharged from the flue gas dryer is 145 ℃;
step three: after entering an activated carbon injection device for flue gas purification, the flue gas sequentially enters a bag-type dust collector and a wet washing tower to obtain fly ash and deacidification wastewater;
step four: and (2) performing secondary washing on the fly ash and the deacidified wastewater in a secondary washing device, mixing the mass volume ratio (g/ml) of solid to liquid in washing according to the ratio of 1:4, strongly stirring and washing for 30 minutes to form mortar, performing solid-liquid separation on the mortar through a centrifugal separation device to obtain a low-salt-content wastewater system and washed fly ash, and allowing the washed fly ash to enter an ash stirring mixer in the step two, wherein the chlorine content in the fly ash is reduced to 5.1% from 11.5%, and the weight of the fly ash is reduced by 56%.
The magnetic iron remover, the bottom slag crusher and the ash and slag stirring mixer in the process well solve the problems of iron-containing substances, coking blocks and the like of the bottom slag, obtain uniform incineration bottom slag, and reduce the water content of the incineration bottom slag to 30 percent. The water content of the dry ash residue is reduced to 5% after the incineration bottom slag and the washing fly ash are dried by the flue gas of the incineration system in a flue gas dryer, and the water content is obviously reduced.
Example 4
As shown in fig. 1, the present embodiment relates to a method for co-processing hazardous waste incineration residue and fly ash, wherein the chlorine content of the fly ash is 9.9%, and the method includes the following steps:
the method comprises the following steps: the incineration residues in the combustion device are washed by water through a water-sealed slag extractor, a magnetic iron remover and a bottom slag crusher in sequence, iron-containing substances in the bottom slag are removed, and the bottom slag is crushed to obtain uniform and fine incineration bottom slag;
step two: cooling flue gas in a combustion device through a flue gas quenching device, then feeding the cooled flue gas into a flue gas dryer, feeding incineration bottom slag into an ash slag stirring mixer, uniformly mixing the incineration bottom slag with water-washed fly ash, and then feeding the mixture into the flue gas dryer for separation to obtain dry ash slag, wherein the temperature of the flue gas in the flue gas dryer is 240 ℃, and the temperature of the flue gas discharged from the flue gas dryer is 220 ℃;
step three: after entering an activated carbon injection device for flue gas purification, the flue gas sequentially enters a bag-type dust collector and a wet washing tower to obtain fly ash and deacidification wastewater;
step four: and (2) performing secondary washing on the fly ash and the deacidified wastewater in a secondary washing device, mixing the mass volume ratio (g/ml) of solid to liquid in washing according to the ratio of 1:6, strongly stirring and washing for 30 minutes to form mortar, performing solid-liquid separation on the mortar through a centrifugal separation device to obtain a low-salt-content wastewater system and washed fly ash, and allowing the washed fly ash to enter an ash stirring mixer in the step two, wherein the chlorine content in the fly ash is reduced to 4.7% from 9.9%, and the weight of the fly ash is reduced by 53%.
The magnetic iron remover, the bottom slag crusher and the ash and slag stirring mixer in the process well solve the problems of iron-containing substances, coking blocks and the like of the bottom slag, obtain uniform incineration bottom slag, and reduce the water content of the incineration bottom slag to 30 percent. The water content of the dry ash residue is reduced to 5% after the incineration bottom slag and the washing fly ash are dried by the flue gas of the incineration system in a flue gas dryer, and the water content is obviously reduced.
The fly ash and the deacidification wastewater are wastes generated by an incineration system, the system energy consumption is derived from the low-grade flue gas waste heat in the incineration system, the incineration system is not influenced, and the problems of high water content of bottom slag, high salt content of the fly ash and waste heat utilization are solved. The system runs stably and has obvious effect in actual engineering operation.
Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes and modifications without inventive changes may be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (7)
1. The utility model provides a danger is useless burns residue and flying ash and deals with system in coordination, includes burner, its characterized in that, the system of dealing with in coordination including the magnetic type de-ironing separator, end sediment breaker, lime-ash agitator mixer and the flue gas desicator that connect gradually, active carbon injection apparatus, sack cleaner, wet scrubbing tower, second grade washing unit and the centrifugal separation device that connect gradually, the solid export intercommunication of magnetic type de-ironing separator and burner, the mouth of cigarette that advances of flue gas desicator and burner communicates, the solid export intercommunication of magnetic type de-ironing separator and burner, the mouth of cigarette intercommunication of active carbon injection apparatus and flue gas desicator, centrifugal separation device be connected with lime-ash agitator mixer.
2. The hazardous waste incineration residue and fly ash co-disposal system according to claim 1, wherein the smoke inlet of the smoke dryer is communicated with the smoke outlet of the combustion device through a smoke quenching device, and the activated carbon injection device is communicated with the smoke quenching device.
3. The hazardous waste incineration residue and fly ash co-disposal system according to claim 1, wherein the magnetic iron remover is connected to the solid outlet of the combustion device through a water-sealed slag extractor.
4. The hazardous waste incineration residue and fly ash co-disposal system according to claim 1, wherein said combustion device is a secondary combustion chamber.
5. The hazardous waste incineration residue and fly ash co-disposal system according to claim 1, wherein the flue gas dryer comprises a low temperature belt dryer and a drum flue gas dryer.
6. The hazardous waste incineration residue and fly ash co-disposal system according to claim 1, wherein the water discharge port of the centrifugal separation device is further connected to a wastewater system.
7. A method for cooperatively treating hazardous waste incineration residue and fly ash is characterized by comprising the following steps:
the method comprises the following steps: the incineration residues in the combustion device are washed by water through a water-sealed slag extractor, a magnetic iron remover and a bottom slag crusher in sequence, iron-containing substances in the bottom slag are removed, and the bottom slag is crushed to obtain uniform and fine incineration bottom slag;
step two: cooling flue gas in a combustion device through a flue gas quenching device, then feeding the cooled flue gas into a flue gas dryer, feeding incineration bottom slag into an ash slag stirring mixer, uniformly mixing the incineration bottom slag with water-washing fly ash, and then feeding the mixture into the flue gas dryer for separation to obtain dry ash slag, wherein the temperature of the flue gas in the flue gas dryer is 160-240 ℃;
step three: after entering an activated carbon injection device for flue gas purification, the flue gas sequentially enters a bag-type dust collector and a wet washing tower to obtain fly ash and deacidification wastewater;
step four: and (2) performing secondary washing on the fly ash and the deacidified wastewater in a secondary washing device, mixing the mass volume ratio (g/ml) of solid and liquid in washing according to the proportion of 1:4-1:10, strongly stirring and washing for 30 minutes to form mortar, performing solid-liquid separation on the mortar through a centrifugal separation device to obtain a low-salt-content wastewater system and washing fly ash, and feeding the washing fly ash into an ash stirring mixer in the step two.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011580889.7A CN112696699A (en) | 2020-12-28 | 2020-12-28 | System and method for co-processing hazardous waste incineration residue and fly ash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011580889.7A CN112696699A (en) | 2020-12-28 | 2020-12-28 | System and method for co-processing hazardous waste incineration residue and fly ash |
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Application publication date: 20210423 |