CN115582405A - Method and system for thermal desorption and detoxification of household garbage incineration fly ash - Google Patents
Method and system for thermal desorption and detoxification of household garbage incineration fly ash Download PDFInfo
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- CN115582405A CN115582405A CN202211269203.1A CN202211269203A CN115582405A CN 115582405 A CN115582405 A CN 115582405A CN 202211269203 A CN202211269203 A CN 202211269203A CN 115582405 A CN115582405 A CN 115582405A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/40—Destroying solid waste or transforming solid waste into something useful or harmless involving thermal treatment, e.g. evaporation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/80—Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B2101/00—Type of solid waste
- B09B2101/30—Incineration ashes
Abstract
The invention belongs to the technical field of hazardous waste heat desorption treatment, and relates to a thermal desorption detoxification system for household garbage incineration fly ash. The inlet of the fly ash pretreatment unit is the inlet of the household garbage incineration fly ash thermal desorption detoxification system, the outlet of the fly ash pretreatment unit is connected with the inlet of the thermal desorption unit, the desorption exhaust gas outlet of the thermal desorption unit is connected with the inlet of the flue gas purification unit, the material outlet of the thermal desorption unit is connected with the inlet of the material cooling and storage unit, and the outlet of the material cooling and storage unit is the outlet of the household garbage incineration fly ash thermal desorption detoxification system. The invention also discloses a method for thermal desorption and detoxification of the household garbage incineration fly ash. The fly ash dechlorination technology, the thermal desorption technology and the flue gas detoxification technology are effectively combined, toxic and harmful substances in the fly ash are efficiently removed, the standard emission of pollutants in the flue gas is ensured, and the problem that the follow-up resource utilization is limited due to the high content of the toxic and harmful substances in the fly ash is solved.
Description
Technical Field
The invention belongs to the technical field of thermal desorption treatment of hazardous waste, relates to a method and a system for recycling incineration fly ash, and particularly relates to a method and a system for thermal desorption detoxification of household garbage incineration fly ash.
Background
The incineration technology gradually replaces sanitary landfill as the main garbage treatment mode in China, however, the domestic garbage can release toxic and harmful substances in the incineration process and is adsorbed by fly ash in smoke, so that the content of the toxic and harmful substances in the fly ash is high, particularly dioxin. Fly ash is therefore identified as hazardous waste (HW 18) and needs to be safely disposed of.
The main components of the fly ash are silicon-aluminum-calcium compounds and soluble salts, wherein the soluble salts can be extracted by washing the fly ash, and the fly ash can be used as a building material raw material for resource utilization after washing. The fly ash recycling treatment technology mainly comprises cement kiln cooperative treatment, high-temperature sintering and plasma melting technologies, and the recycling treatment technologies are high-temperature heat treatment technologies, but the high-temperature sintering, melting and cement kiln calcination treatment temperatures are high, and the energy consumption is high. Therefore, before the fly ash is recycled, it is necessary to develop a pretreatment technology and method for fly ash detoxification to separate out toxic and harmful substances in the fly ash, thereby providing guarantee for the fly ash recycling.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a thermal desorption detoxification system for fly ash generated by burning household garbage, which comprises a fly ash pretreatment unit, a thermal desorption unit, a flue gas purification unit and a material cooling and storage unit.
Firstly, the fly ash pretreatment unit reduces the content of soluble chlorine salt in the fly ash to be below 1 percent and the water content to be below 3 percent, so that the problems of secondary fly ash, overhigh chlorine content in flue gas, equipment corrosion and the like caused in the subsequent thermal desorption and resource treatment processes can be solved by fly ash dechlorination, and the fly ash pretreatment unit is an indispensable pretreatment link in the fly ash thermal desorption and resource treatment.
Secondly, the temperature of the fly ash material is raised in the thermal desorption unit, so that toxic and harmful substances in the fly ash are released, the detoxification treatment of the fly ash can be fully realized, and the requirements of the fly ash resource utilization related standards and specifications are met.
Thirdly, adopt the oxygen-insulated heating mode among the thermal desorption unit, the flue gas volume is few, handles the desorption waste gas that produces among the thermal desorption unit, alleviates follow-up exhaust-gas treatment's difficulty and treatment cost, and the desorption waste gas passes through the pollutant and the particulate matter in the flue gas purification unit can effectively desorption flue gas, can effectually guarantee the discharge to reach standard of flue gas.
Fourthly, in the flue gas purification unit, the high-temperature flue gas is cooled through flue gas recirculation, so that the removal efficiency of pollutants in the flue gas can be improved, and partial energy consumption and cost can be saved.
Fifthly, in the system for thermal desorption and detoxification of the fly ash from incineration of household garbage, a data online monitoring device is configured to monitor the treatment effect and emission index of pollutants in flue gas in real time, so that the standard emission of the flue gas is fully guaranteed. In addition, each key monitoring position in the system is provided with temperature and flow monitoring equipment so as to ensure the continuous and stable operation of the system.
The method effectively combines the fly ash water washing dechlorination technology, the thermal desorption technology and the flue gas detoxification technology, efficiently removes toxic and harmful substances in the fly ash, can ensure the standard discharge of pollutants in the flue gas, and solves the problem that the follow-up resource utilization is limited due to the high content of the toxic and harmful substances in the fly ash. The invention is used as an indispensable pretreatment link before the fly ash resource disposal, and can fully ensure the harmless, reduction and resource disposal of the fly ash.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a thermal desorption detoxification system for fly ash generated by burning household garbage comprises a fly ash pretreatment unit, a thermal desorption unit, a flue gas purification unit and a material cooling and storage unit.
The inlet of the fly ash pretreatment unit is the inlet of a household garbage incineration fly ash thermal desorption detoxification system, the outlet of the fly ash pretreatment unit is connected with the inlet of the thermal desorption unit, the desorption waste gas outlet of the thermal desorption unit is connected with the inlet of the flue gas purification unit, the material outlet of the thermal desorption unit is connected with the inlet of the material cooling and storage unit, and the outlet of the material cooling and storage unit is the outlet of the household garbage incineration fly ash thermal desorption detoxification system.
The fly ash pretreatment unit comprises an original ash storage and conveying device, a fly ash washing dechlorination device and a washing ash drying device. The raw ash storage and conveying device is an inlet of the fly ash pretreatment unit, an outlet of the raw ash storage and conveying device is connected with an inlet of the fly ash washing dechlorination device, a material outlet of the fly ash washing dechlorination device is connected with an inlet connected with the water washed ash drying device, and an outlet of the water washed ash drying device is an outlet of the fly ash pretreatment unit.
Furthermore, the flying ash washing dechlorination device can remove soluble salt in the flying ash, and the content of soluble chlorine in the flying ash after washing is less than or equal to 1 percent so as to reduce the chlorine content in the desorption waste gas and the secondary flying ash generation amount in the thermal desorption process.
Furthermore, the water content in the water washing fly ash can be reduced by the water washing ash drying device, and the water content of the dried fly ash is less than or equal to 3 percent so as to reduce the generation amount of desorption waste gas and the water vapor content in the waste gas in the thermal desorption process.
The thermal desorption unit mainly comprises a dechlorination fly ash conveying and feeding device, a thermal desorption device and a heating device. The inlet of the dechlorination fly ash conveying and feeding device is the inlet of the thermal desorption unit, the outlet of the dechlorination fly ash conveying and feeding device is connected with the inlet of the thermal desorption device, the material outlet of the thermal desorption device is connected with the inlet of the material cooling and storage unit, the desorption waste gas outlet of the thermal desorption device is connected with the inlet of the flue gas purification unit, and the outlet of the heating device is connected with the heat source inlet of the thermal desorption device.
Furthermore, the thermal desorption device adopts an oxygen-insulated heating mode, and is an indirect heating type furnace kiln and a solid heat carrier furnace kiln.
Furthermore, the thermal desorption device is divided into a preheating section, a sintering section and a cooling section according to the treatment stage of the materials, so that the toxic and harmful substances in the fly ash can be efficiently and stepwise removed.
Further, the inside gas environment of thermal desorption device is little negative pressure state to discharge smoothly of inside gas avoids desorption waste gas to reveal, the polluted environment.
Furthermore, the dechlorination fly ash conveying and feeding device adopts a pneumatic conveying and spiral feeding mode so as to better adjust and control the feeding amount.
The flue gas purification unit mainly comprises a dust removal device, a gas heat exchange device, an adsorption device and an online monitoring device. The inlet of the dust removal device is the inlet of the flue gas purification unit, the outlet of the dust removal device is connected with the inlet of the gas heat exchange device, the outlet of the gas heat exchange device is connected with the adsorption device and the inlet of the dust removal device, and the outlet of the adsorption device is the outlet of the flue gas purification unit.
Further, the dust removal device is preferably a ceramic filter cartridge dust remover or a bag-type dust remover so as to effectively remove particulate matters in the flue gas.
Furthermore, the adsorption device preferably selects an activated carbon adsorption bed layer and a selenium filter to realize the detoxification treatment of the flue gas.
Further, the on-line monitoring device is respectively arranged at the front end and the rear end of the adsorption device so as to monitor the flue gas purification efficiency.
Further, gaseous heat transfer device cools down the desorption waste gas of thermal desorption device output, later, and the flue gas returns after partly cooling to the dust remover entry, for the cooling of front end high temperature flue gas, reducible energy resource consumption, and can realize the enrichment of pollutant in the flue gas, be favorable to improving adsorption equipment's desorption efficiency.
Further, the flue gas purification unit also comprises a flue gas secondary combustion chamber and a waste heat recovery device, so that toxic and harmful substances in the flue gas are further decomposed, and the standard treatment of the flue gas is more effectively ensured. The inlet of the second flue gas combustion chamber is connected with the desorption waste gas outlet of the thermal desorption device, the outlet of the second flue gas combustion chamber is connected with the inlet of the waste heat recovery device, the flue gas outlet of the waste heat recovery device is connected with the dust removal device, the heat exchange gas outlet of the waste heat recovery device is connected with the heat source inlet of the washing ash drying device of the fly ash pretreatment unit, and a heat source is provided for the drying device so as to save the overall energy consumption of the system.
The material cooling and storing unit mainly comprises a fly ash storing device and a cooling and drying device. The inlet of the fly ash storage device is the inlet of the material cooling and storage unit, the outlet of the cooling and drying device is connected with the fly ash storage device, and the outlet of the fly ash storage device is the outlet of the material cooling and storage unit.
Furthermore, the cooling and drying device is a refrigeration dehumidifier to remove water in natural air and prevent the fly ash from hardening in the storage process.
Furthermore, a dust removal device is arranged at the top of the fly ash storage device.
The second technical scheme of the invention is a method for thermal desorption and detoxification of incineration fly ash of household garbage, which comprises the following steps:
step (1): after entering the field, the fly ash is subjected to washing dechlorination and drying treatment by a fly ash pretreatment unit, and the treated fly ash contains soluble chlorine less than or equal to 1 percent and has water content less than or equal to 3 percent.
Step (2): dechlorinated fly ash enters a thermal desorption device through a conveying and feeding device, the feeding amount is controlled by adjusting the rotating speed, and a heating device is started.
And (3): the fly ash is heated in the thermal desorption device to raise the temperature, and toxic and harmful substances in the fly ash are released into the smoke under the high-temperature condition, so that the detoxification treatment of the fly ash is realized. Wherein the heating temperature is set at 300-600 deg.C, and the heating time is 30-90min, preferably 50-70min.
And (4): and (4) discharging the material from the discharging end of the thermal desorption device in the step (3), cooling the material in a pneumatic conveying mode, and then temporarily storing the material in a fly ash storage device. Wherein the material outlet temperature is 200-550 ℃, and the material temperature after cooling is 60-70 ℃.
And (5): and (4) discharging flue gas generated in the thermal desorption device in the step (3) from a desorption waste gas outlet, allowing the flue gas to enter a flue gas purification unit for treatment, heating the desorption waste gas in a flue gas secondary combustion chamber, further decomposing toxic and harmful substances in the flue gas, allowing the flue gas to pass through a waste heat recovery device, allowing the high-temperature flue gas to enter a dust removal device after being cooled so as to remove particles in the flue gas, indirectly cooling the flue gas by using natural air, allowing the cooled flue gas to enter an adsorption device for adsorption and removal of pollutants, and allowing the desorbed waste gas to reach the standard and then be discharged. Wherein the outlet temperature of the desorption waste gas is 200-550 ℃, the temperature of the secondary flue gas combustion chamber is 850-1500 ℃, the temperature is 200-350 ℃ before entering a dust removal device comprising a ceramic filter cartridge dust remover, a cloth bag dust remover and the like, the temperature is 70-80 ℃ before entering an adsorption device, and hot air generated by a waste heat recovery device is used as a heat source of a washing ash drying device.
The technical scheme of the invention brings beneficial effects and innovation points
Compared with the prior art, the invention has the following technical effects:
(1) The method is characterized in that soluble salts in the fly ash are removed through the fly ash water washing pretreatment, and the water-washed fly ash is dried to meet the requirements of subsequent thermal desorption and resource treatment, so that the problems of secondary fly ash, high content of flue gas chlorine, equipment corrosion and the like caused in the subsequent thermal desorption and resource treatment process can be solved through fly ash dechlorination, and the method is an indispensable pretreatment link in the fly ash thermal desorption and resource treatment.
(2) The thermal desorption technology is adopted to remove toxic and harmful substances in the fly ash, and the desorption waste gas is detoxified, so that the toxic and harmful substances in the fly ash are thoroughly removed, and the technical guarantee is provided for the subsequent resource utilization of the fly ash.
(3) The heating treatment is carried out on the fly ash material by adopting an anaerobic heating mode, the material is heated by utilizing contact heat transfer and radiation heat transfer, the heat transfer efficiency is high, the generation of smoke can be reduced by adopting the anaerobic heating mode, and the difficulty of subsequent smoke treatment is reduced.
(4) The system is provided with an online pollutant monitoring device to monitor the emission concentration of pollutants in the flue gas in real time and fully ensure the standard emission of the flue gas.
Drawings
FIG. 1: example 1 flow chart of a system for thermal desorption detoxification of incineration fly ash of household garbage;
wherein: the system comprises a raw ash storage and transportation device 1, a flying ash washing dechlorination device 2, an ash washing and drying device 3, a thermal desorption device 4, a heating device 5, a flying ash storage device 6, a dust removal device 7, a gas heat exchange device 8 and an adsorption device 9.
FIG. 2: embodiment 2 flow chart of thermal desorption detoxification system for fly ash from incineration of household garbage
Wherein: 1 former ash storage device, 2 flying dust washing dechlorination devices, 3 washing ash drying device, 4 thermal desorption device, 5 heating device, 6 flying dust storage device, 7 dust collector, 8 gaseous heat transfer device, 9 adsorption equipment, 10 flue gas second combustion chamber, 11 waste heat recovery device.
FIG. 3: a process flow chart of a thermal desorption detoxification system of incineration fly ash of household garbage.
Detailed Description
The present invention will now be described more fully hereinafter with reference to the accompanying drawings.
Example 1
As shown in fig. 1 and 3, the method for thermal desorption and detoxification of fly ash from incineration of household garbage comprises the following steps:
step (1): after the fly ash enters a field, the fly ash is subjected to washing dechlorination and drying treatment by a fly ash pretreatment unit, and the treated fly ash contains soluble chlorine less than or equal to 1 percent, has a water content less than or equal to 3 percent and preferably has a water content less than or equal to 2 percent.
Step (2): dechlorination flying ash enters the thermal desorption device through the conveying and feeding device, the feeding amount is controlled by adjusting the rotating speed, and the heating device is started.
And (3): heating the fly ash in a thermal desorption device to raise the temperature, so that the temperature of the fly ash material reaches 500 ℃, setting the heating time to be 60min, and releasing toxic and harmful substances in the fly ash into desorption waste gas under the high-temperature condition to realize the detoxification treatment of the fly ash.
And (4): and (4) discharging the material from the discharge end of the thermal desorption device in the step (3), reducing the temperature of the material to 70 ℃ in a pneumatic conveying mode, and then entering a fly ash storage device for temporary storage.
And (5): and (3) discharging the desorption waste gas generated in the thermal desorption device from an outlet of the thermal desorption device, wherein the temperature of the desorption waste gas is about 500 ℃, the desorption waste gas is cooled to 300 ℃ through flue gas recirculation, and then the desorption waste gas enters the ceramic filter cylinder to remove particles in the flue gas, then the natural air is used for indirectly cooling the flue gas, the flue gas enters the adsorption device to remove pollutants in the flue gas after being cooled to 70 ℃, and then the desorption waste gas is discharged after reaching the standard.
And (6): and (4) exhausting flue gas generated by the sleeve of the thermal desorption device in the step (3) from the exhaust port in the interlayer, wherein the exhaust port is provided with a temperature monitor, the temperature of the hearth gas is about 600 ℃, then introducing part of natural air to cool the high-temperature hearth gas, performing denitration and dedusting treatment after cooling to 240 ℃, and discharging the treated hearth gas up to the standard.
Example 2
As shown in figure 2, the method for thermal desorption detoxification of the fly ash from incineration of domestic garbage comprises the following steps:
step (1): after the fly ash enters a field, the fly ash is subjected to washing dechlorination and drying treatment by a fly ash pretreatment unit, and the treated fly ash contains soluble chlorine less than or equal to 1 percent, has a water content less than or equal to 3 percent and preferably has a water content less than or equal to 2 percent.
Step (2): dechlorinated fly ash enters a thermal desorption device through a conveying and feeding device, the feeding amount is controlled by adjusting the rotating speed, and a heating device is started.
And (3): heating the fly ash in a thermal desorption device to raise the temperature, so that the temperature of the fly ash material reaches 600 ℃, setting the heating time to be 45min, and releasing toxic and harmful substances in the fly ash into smoke under the high-temperature condition to realize the detoxification treatment of the fly ash.
And (4): and (4) discharging the material from the discharge end of the thermal desorption device in the step (3), reducing the temperature of the material to 70 ℃ in a pneumatic conveying mode, and then entering a fly ash storage device for temporary storage.
And (5): and (4) discharging flue gas generated in the thermal desorption device in the step (3) from a desorption waste gas outlet, wherein the temperature of the desorption waste gas is about 600 ℃, the flue gas enters a flue gas secondary combustion chamber and is heated to 1400 ℃ so as to decompose dioxin in the flue gas, then the high-temperature flue gas is cooled to 240 ℃ through a waste heat recovery device, the flue gas enters a bag-type dust remover so as to remove particulate matters in the flue gas, then the flue gas is indirectly cooled by utilizing natural air, the flue gas enters an adsorption device after being cooled to 70 ℃ so as to be adsorbed and remove pollutants, and finally the desorption waste gas reaches the standard and is discharged.
And (6): and (4) exhausting flue gas generated by the sleeve of the thermal desorption device in the step (3) from the exhaust port in the interlayer, wherein the exhaust port is provided with a temperature monitor, the temperature of the hearth gas is about 700 ℃, then introducing part of natural air to cool the high-temperature hearth gas, performing denitration and dedusting treatment after the temperature is reduced to 240 ℃, and discharging the treated hearth gas up to the standard.
Claims (7)
1. A thermal desorption detoxification system for household garbage incineration fly ash is characterized by mainly comprising a fly ash pretreatment unit, a thermal desorption unit, a flue gas purification unit and a material cooling and storage unit;
the inlet of the fly ash pretreatment unit is the inlet of a household garbage incineration fly ash thermal desorption detoxification system, the outlet of the fly ash pretreatment unit is connected with the inlet of the thermal desorption unit, the desorption waste gas outlet of the thermal desorption unit is connected with the inlet of the flue gas purification unit, the material outlet of the thermal desorption unit is connected with the inlet of the material cooling and storage unit, and the outlet of the material cooling and storage unit is the outlet of the household garbage incineration fly ash thermal desorption detoxification system;
the fly ash pretreatment unit comprises an original ash storage and conveying device, a fly ash washing dechlorination device and a washed ash drying device, wherein the original ash storage and conveying device is an inlet of the fly ash pretreatment unit, an outlet of the original ash storage and conveying device is connected with an inlet of the fly ash washing dechlorination device, a material outlet of the fly ash washing dechlorination device is connected with an inlet connected with the washed ash drying device, and an outlet of the washed ash drying device is an outlet of the fly ash pretreatment unit;
the thermal desorption unit mainly comprises a dechlorination fly ash conveying and feeding device, a thermal desorption device and a heating device, wherein the inlet of the dechlorination fly ash conveying and feeding device is the inlet of the thermal desorption unit, the outlet of the dechlorination fly ash conveying and feeding device is connected with the inlet of the thermal desorption device, the material outlet of the thermal desorption device is connected with the inlet of the material cooling and storing unit, the desorption waste gas outlet of the thermal desorption device is connected with the inlet of the flue gas purification unit, and the outlet of the heating device is connected with the heat source inlet of the thermal desorption device;
the flue gas purification unit mainly comprises a dust removal device, a gas heat exchange device, an adsorption device and an online monitoring device, wherein an inlet of the dust removal device is an inlet of the flue gas purification unit, an outlet of the dust removal device is connected with an inlet of the gas heat exchange device, an outlet of the gas heat exchange device is connected with the adsorption device and an inlet of the dust removal device, and an outlet of the adsorption device is an outlet of the flue gas purification unit;
the material cooling and storing unit mainly comprises a fly ash storing device and a cooling and drying device, wherein the inlet of the fly ash storing device is the inlet of the material cooling and storing unit, the outlet of the cooling and drying device is connected with the fly ash storing device, and the outlet of the fly ash storing device is the outlet of the material cooling and storing unit.
2. The system for thermal desorption detoxification of incineration fly ash of domestic garbage according to claim 1, wherein the thermal desorption device in the thermal desorption unit adopts an anaerobic heating mode, and adopts an indirect heating type kiln or a solid heat carrier kiln; and is divided into a preheating section, a sintering section and a cooling section according to the treatment stage of the materials.
3. The system for thermal desorption and detoxification of fly ash from incineration of household garbage according to claim 1, wherein the dust removal device in the flue gas purification unit is a ceramic cartridge dust remover or a bag dust remover, and the adsorption device is an activated carbon adsorption bed or a selenium filter.
4. The system for thermal desorption and detoxification of fly ash from incineration of household garbage according to claim 1, wherein the gas heat exchanger in the flue gas purification unit cools the high temperature flue gas, and then a portion of the cooled flue gas returns to the inlet of the dust remover.
5. The system for thermal desorption detoxification of incineration fly ash of domestic garbage according to claim 1, wherein the cooling and drying device in the material cooling and storage unit is a freeze dehumidifier.
6. A method for thermal desorption detoxification of incineration fly ash of household garbage by using the system of any one of claims 1 to 5, which is characterized by comprising the following steps:
step (1): the fly ash is subjected to washing dechlorination and drying treatment by a fly ash pretreatment unit;
step (2): dechlorination fly ash enters a thermal desorption device through a conveying and feeding device, the feeding amount is controlled by adjusting the rotating speed, and a heating device is started;
and (3): heating the fly ash in a thermal desorption device to raise the temperature, and releasing toxic and harmful substances in the fly ash into smoke under the high-temperature condition to realize the detoxification treatment of the fly ash;
and (4): discharging the material from the discharge end of the thermal desorption device in the step (3), cooling the material in a pneumatic conveying mode, and then temporarily storing the material in a fly ash storage device;
and (5): the flue gas generated in the thermal desorption device in the step (3) is discharged from a desorption waste gas outlet, enters a flue gas purification unit for treatment, enters a dust removal device to remove particulate matters after being subjected to flue gas recirculation cooling, then indirectly cools the flue gas by using natural air, enters an adsorption device to remove pollutants in the flue gas after being cooled, and then the desorption waste gas is discharged after reaching the standard;
after the fly ash is pretreated in the step (1), the content of soluble chlorine in the fly ash is less than or equal to 1 percent, and the water content is less than or equal to 3 percent;
the heating temperature in the thermal desorption device in the step (3) is set to be 300-600 ℃, and the heating time is 30-90min;
in the step (4), the material outlet temperature is 200-550 ℃, and the material temperature after cooling is 60-70 ℃;
in the step (5), the temperature of the desorbed waste gas outlet is 200-550 ℃, the temperature before entering the ceramic filter cylinder is 200-350 ℃, and the temperature before entering the adsorption device is 70-80 ℃.
7. The method for thermal desorption detoxification of fly ash from incineration of household garbage according to claim 6, wherein the desorption exhaust gas in the step (5) enters the flue gas secondary combustion chamber, decomposes dioxin at a temperature of 850-1500 ℃, and then enters the waste heat recovery device to cool the high temperature flue gas, and the waste heat is recovered to the water washed ash drying device.
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| CN202211269203.1A CN115582405A (en) | 2022-10-17 | 2022-10-17 | Method and system for thermal desorption and detoxification of household garbage incineration fly ash |
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| CN202211269203.1A CN115582405A (en) | 2022-10-17 | 2022-10-17 | Method and system for thermal desorption and detoxification of household garbage incineration fly ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116283338A (en) * | 2023-03-14 | 2023-06-23 | 福州大学 | System and method for firing ceramsite by using waste incineration fly ash |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116283338A (en) * | 2023-03-14 | 2023-06-23 | 福州大学 | System and method for firing ceramsite by using waste incineration fly ash |
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