CN112762459A - Device and method for eliminating dioxin in fly ash - Google Patents

Device and method for eliminating dioxin in fly ash Download PDF

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Publication number
CN112762459A
CN112762459A CN202011530112.XA CN202011530112A CN112762459A CN 112762459 A CN112762459 A CN 112762459A CN 202011530112 A CN202011530112 A CN 202011530112A CN 112762459 A CN112762459 A CN 112762459A
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combustion chamber
oxygen
gas
fly ash
outlet
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CN112762459B (en
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韩江霖
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Wuxi Yangtai Environmental Technology Co ltd
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Wuxi Yangtai Environmental Technology Co ltd
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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
    • F23G5/08—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating
    • F23G5/14—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion
    • F23G5/16—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating including secondary combustion in a separate combustion chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
    • F23G5/44—Details; Accessories
    • F23G5/46—Recuperation of heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2202/00—Combustion
    • F23G2202/10—Combustion in two or more stages
    • F23G2202/103—Combustion in two or more stages in separate chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2206/00—Waste heat recuperation
    • F23G2206/20—Waste heat recuperation using the heat in association with another installation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
    • F23G2209/00—Specific waste
    • F23G2209/30—Solid combustion residues, e.g. bottom or flyash
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The invention discloses a device and a method for eliminating dioxin in fly ash, and belongs to the field of resource science and technology. The device comprises an oxygen-enriched smelting furnace, a secondary combustion chamber and a heat exchanger, wherein the oxygen-enriched smelting furnace provides an oxygen-enriched environment; the oxygen boosting smelting pot is equipped with first entry and first export, and the second combustion chamber is equipped with second entry and second export, is connected through closed passage between first export and the first entry, and heat exchanger connects in the second exit, and dioxin carries out the schizolysis under the heating condition in the fly ash and generates carbon monoxide and carbon dioxide, and the second combustion chamber is used for carbon monoxide to carry out the oxidation and generates carbon dioxide, and heat exchanger is used for carrying out the heat exchange to gas in the second combustion chamber, and the second export is used for carrying out discharge to reach standard to gas after the heat exchange. The invention creates an oxidizing atmosphere for carbon and carbon substances in flue gas after cracking dioxin in the fly ash in an oxygen-rich environment, thoroughly oxidizes the carbon dioxide to form carbon dioxide, does not need quenching to realize harmlessness, saves investment and operation cost, and utilizes waste heat of the discharged tail gas and discharges the tail gas after reaching the standard.

Description

Device and method for eliminating dioxin in fly ash
Technical Field
The invention relates to the field of resource science and technology, in particular to a device and a method for eliminating dioxin in fly ash.
Background
In the process of burning the household garbage, because a large amount of chlorine-containing organic matters participate, dangerous wastes such as fly ash containing dioxin and heavy metals can not be generated in the burning environment of the burning furnace.
As for the treatment method of the fly ash, in the related art, the landfill and the cement kiln are mainly adopted for cooperative treatment, and the high-temperature melting of the plasma is adopted. In the treatment method, the cooperation treatment of the cement kiln and the high-temperature melting method of the plasma are used for treating the dioxin, the dioxin is cracked at high temperature, and the dioxin is prevented from being synthesized again in the tail gas treatment by a quenching method, so that the aim of removing the dioxin is fulfilled.
Therefore, the method for eliminating the dioxin in the related technology has higher cost, most of the quenching methods are spraying by water, and the quenching treatment cost is higher.
Disclosure of Invention
The invention provides a device and a method for eliminating dioxin in fly ash, which can solve the problems that the dioxin treatment mode is single and the treated waste is still harmful substances in the related technology. The technical scheme is as follows:
in one aspect, there is provided an apparatus for eliminating dioxin in fly ash, the apparatus including: the system comprises an oxygen-enriched smelting furnace, a secondary combustion chamber and a heat exchanger, wherein the oxygen-enriched smelting furnace provides an oxygen-enriched environment, and the content of oxygen enriched in the oxygen-enriched environment is more than or equal to 40%;
the oxygen-enriched smelting furnace is provided with a first inlet and a first outlet, the second combustion chamber is provided with a second inlet and a second outlet, the first outlet is connected with the first inlet through a closed channel, the heat exchanger is connected with the second outlet, the oxygen-enriched smelting furnace is used for heating fly ash input by the first inlet, dioxin in the fly ash is cracked under the heating condition to generate carbon monoxide and carbon dioxide, the second combustion chamber is used for oxidizing the carbon monoxide to generate the carbon dioxide, the heat exchanger is used for carrying out heat exchange on gas in the second combustion chamber, and the second outlet is used for discharging the gas after heat exchange after reaching the standard;
the height of the second combustion chamber is obtained according to the gas flow of the first outlet, the discharge area and the preset reaction time, wherein the preset reaction time is the gas reaction time in the second combustion chamber, and the discharge area is the cross-sectional area of the second inlet.
Optionally, the first outlet is provided with a flow meter, and the flow meter is used for monitoring the gas flow rate of the first outlet.
Optionally, the second combustion chamber is of a folding design and is provided with a height adjusting device, and the height adjusting device is configured to obtain the gas flow monitored by the flow meter at preset intervals, and determine the height adjusting amount of the second combustion chamber according to the gas flow, the discharge area and the preset reaction time.
Optionally, the inner wall of the second combustion chamber is made of refractory materials;
the bottom of the second combustion chamber is provided with at least 2 rows of grooves, the 2 rows of grooves are designed in a spiral rising mode, and the 2 rows of grooves are used for promoting the gas flow in the second combustion chamber.
On the other hand, a method for eliminating dioxin in fly ash is also provided, and the method for eliminating dioxin in fly ash is suitable for the device for eliminating dioxin in fly ash, and the method comprises the following steps:
feeding the fly ash into the oxygen-enriched smelting furnace through the first inlet for primary combustion, wherein the temperature range of the primary combustion is 1350-1500 ℃;
in response to completion of cracking of dioxins in the fly ash, post-cracking gas is subjected to post-combustion, the post-cracking gas including carbon species, wherein the carbon species are incompletely combusted at the post-combustion to form carbon monoxide and carbon dioxide;
delivering the carbon monoxide and the carbon dioxide from the first outlet to the second inlet through the closed passage into the secondary combustion chamber, wherein the secondary combustion chamber is provided with the oxygen-enriched environment;
and responding to the sufficient oxidation of the carbon monoxide in the oxygen-enriched environment of the secondary combustion chamber to form carbon dioxide, and performing standard emission on the gas in the secondary combustion chamber through the second outlet.
Optionally, the oxygen-rich content in the oxygen-rich furnace simultaneously satisfies the oxygen demand for heating the fly ash and the oxygen demand for cracking the dioxin.
Optionally, the delivering the carbon monoxide and the carbon dioxide to the secondary combustion chamber through the closed channel includes:
discharging the carbon monoxide and the carbon dioxide from the first outlet;
delivering the carbon monoxide and the carbon dioxide to the second inlet through the closed channel.
Optionally, after discharging the carbon monoxide and the carbon dioxide from the first outlet, the method further comprises:
the gas flow monitored by the flowmeter is obtained in the preset interval through the height adjusting device, and the height adjusting quantity of the secondary combustion chamber is determined according to the gas flow, the discharge area and the preset reaction time, wherein the height adjusting device is arranged at the secondary combustion chamber, the flowmeter is arranged at the first outlet, the preset reaction time is the gas reaction time in the secondary combustion chamber, and the discharge area is the cross sectional area of the second inlet.
Optionally, chlorine species are also generated after the dioxin is cracked;
after the post-combustion of the cracked gas, the method further comprises:
the chlorine substance generated by cracking the dioxin is retained in the oxygen-enriched melting furnace to be heated continuously, wherein the chlorine substance reacts with the residual calcium oxide in the fly ash to form calcium chloride;
and filtering and recovering the calcium chloride.
Optionally, before the gas in the second combustion chamber is discharged through the second outlet after reaching the standard, the method further comprises:
and starting the heat exchanger to perform the heat exchange on the gas in the secondary combustion chamber.
The invention can bring the following beneficial effects:
the device for eliminating the dioxin in the fly ash has a simple structure, creates an oxidizing atmosphere for carbon and carbon substances in flue gas after the dioxin in the fly ash is cracked by realizing an oxygen-enriched environment in an oxygen-enriched smelting furnace and a secondary combustion chamber, thoroughly oxidizes the carbon and carbon substances to form carbon dioxide, does not need quenching to realize harmlessness, saves investment and operation cost, and utilizes waste heat of discharged tail gas and discharges the tail gas up to the standard.
Drawings
Fig. 1 is a schematic structural view illustrating an apparatus for removing dioxin from fly ash according to an exemplary embodiment of the present application;
fig. 2 is a schematic structural view of an apparatus for eliminating dioxin in fly ash according to an exemplary embodiment of the present application;
fig. 3 is a flowchart illustrating a method of removing dioxin from fly ash according to an exemplary embodiment of the present application;
fig. 4 shows a flowchart of a method for removing dioxin from fly ash according to another exemplary embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Reference herein to "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
Example 1
Referring to fig. 1, a schematic structural diagram of an apparatus for eliminating dioxin in fly ash according to an exemplary embodiment of the present application is shown.
As shown in FIG. 1, the abatement apparatus includes an oxygen-rich furnace 110, a secondary combustion chamber 120, and a heat exchanger 130, wherein the oxygen-rich furnace 110 provides an oxygen-rich environment in which the oxygen-rich content is greater than or equal to 40%.
The oxygen-enriched smelting furnace 110 is provided with a first inlet 111 and a first outlet 112, the second combustion chamber 120 is provided with a second inlet 121 and a second outlet 122, the first outlet 112 is connected with the first inlet 111 through a closed channel 140, and the heat exchanger 130 is connected with the second outlet 122, wherein the oxygen-enriched smelting furnace 110 is used for heating the fly ash input by the first inlet 111, dioxin in the fly ash is cracked under heating conditions to generate carbon monoxide and carbon dioxide, the second combustion chamber 120 is used for oxidizing the carbon monoxide to generate carbon dioxide, the heat exchanger 130 is used for exchanging heat of gas in the second combustion chamber 120, and the second outlet 122 is used for discharging the gas after heat exchange after reaching standards.
Optionally, the second outlet 122 may be connected to a flue gas purification system, and the flue gas purification system purifies and discharges the heat-exchanged gas.
The height of the second combustion chamber 120 is obtained according to the gas flow rate of the first outlet 112, the discharge area and the preset reaction time, wherein the preset reaction time is the gas reaction time in the second combustion chamber 120, and the discharge area is the cross-sectional area of the second inlet.
Optionally, the preset reaction time is not less than 2 seconds.
In conclusion, the device for eliminating the dioxin in the fly ash has a simple structure, and can create an oxidizing atmosphere for carbon and carbon substances in flue gas after the dioxin in the fly ash is cracked by realizing an oxygen-enriched environment in the oxygen-enriched smelting furnace and the secondary combustion chamber, so that carbon dioxide is completely oxidized to form carbon dioxide, the device does not need to be quenched to realize harmlessness, saves investment and operation cost, and utilizes waste heat of the discharged tail gas and discharges the tail gas after reaching the standard.
Example 2
Referring to fig. 2, a schematic structural diagram of an apparatus for eliminating dioxin in fly ash according to another exemplary embodiment of the present application is shown. The device shown in fig. 1 is further illustrated by the device shown in fig. 2 on the basis of fig. 1.
As shown in fig. 2, the first outlet 112 is provided with a flow meter 113, and the flow meter 113 is used for monitoring the gas flow rate of the first outlet 112.
Optionally, the second combustion chamber 120 is of a folding design and is provided with a height adjusting device, and the height adjusting device is used for acquiring the gas flow monitored by the flow meter at preset intervals and determining the height adjusting amount of the second combustion chamber 120 according to the gas flow, the discharge area and the preset reaction time.
The height adjusting device is a circuit structure, which is not shown in fig. 2.
Optionally, the inner wall of the second combustion chamber 120 is made of refractory material to accommodate the inflow of high-temperature gas.
Optionally, as shown in fig. 2, at least 2 rows of grooves 123 are provided at the bottom of the second combustion chamber 120, at least 2 rows of grooves 123 are designed in a spiral ascending manner, and at least 2 rows of grooves 123 are used for promoting the gas flow in the second combustion chamber 120.
In the embodiment of the application, the flow of the first outlet airflow is accurately monitored through the flow meter, and the adjusting accuracy of the height adjusting device is further improved.
In the embodiment of the application, the intelligent adjustment of the height of the second combustion chamber is realized by arranging the height adjusting device, the manpower monitoring cost is saved, and the operation accuracy is also improved.
In the embodiment of the application, through the inner wall that adopts refractory material to set up, improved the life of second combustion chamber, further ensured the abundant possibility of reacting of carbon monoxide.
In this application embodiment, set up 2 at least rows of recesses through second combustion chamber bottom, realize gaseous indoor flow, further shorten reaction time, improve the operating efficiency.
Example 3
Referring to fig. 3, a flowchart illustrating a method for removing dioxin from fly ash according to an exemplary embodiment of the present application is shown. The present embodiment is described by taking the method as an example for the device for eliminating dioxin in fly ash provided in the above embodiment, and the method includes:
and 301, sending the fly ash into the oxygen-enriched smelting furnace through the first inlet for primary combustion.
Wherein the temperature range of the primary combustion is 1350-1500 ℃, and the temperature range of the primary combustion is set according to the cracking temperature of dioxin in the fly ash.
Wherein the temperature range of the primary combustion makes the fly ash fully melted.
In one example, the cracking temperature of dioxin is 1400 ℃, and the primary combustion temperature range in the embodiment of the present application satisfies the condition.
And 302, in response to the dioxin in the fly ash being cracked, performing secondary combustion on the cracked gas, wherein the cracked gas comprises carbon substances, and the carbon substances are incompletely combusted during the secondary combustion to form carbon monoxide and carbon dioxide.
Step 303, delivering carbon monoxide and carbon dioxide from the first outlet to the second inlet through the closed channel, and entering the second combustion chamber.
The secondary combustion chamber is provided with an oxygen-enriched environment, and can further oxidize carbon monoxide, so that the regeneration condition of dioxin is eliminated through primary combustion and secondary combustion, and the aim of eliminating the dioxin is fulfilled.
In one possible embodiment, oxygen is supplied to the second combustion chamber to ensure an oxygen-rich environment in the second combustion chamber.
And 304, responding to the sufficient oxidation of the carbon monoxide in the oxygen-enriched environment of the secondary combustion chamber to form carbon dioxide, and discharging the gas in the secondary combustion chamber after reaching the standard through a second outlet.
Furthermore, after the carbon substances are fully combusted into carbon dioxide, the gas in the second combustion chamber can be discharged up to the standard through the second outlet.
In summary, the present application provides a method for eliminating dioxin in fly ash, which has simple steps, and by implementing an oxygen-rich environment in an oxygen-rich furnace and a combustion chamber, sufficient oxygen can be provided for the chemical reaction of dioxin in fly ash, and a reducing atmosphere is created for carbon substances after cracking of dioxin, so that the carbon substances are sufficient and then carbon monoxide and carbon dioxide are generated, and the remaining carbon monoxide is continuously oxidized by the oxygen-rich combustion chamber, so that harmless gas is finally obtained, and finally the harmless gas is discharged after reaching standards.
Example 4
Referring to fig. 4, a flow chart of a method for eliminating dioxin in fly ash according to another exemplary embodiment of the present application is shown. The present embodiment is described by taking the method as an example for the device for eliminating dioxin in fly ash provided in the above embodiment, and the method includes:
step 401, feeding the fly ash into an oxygen-enriched furnace through a first inlet for primary combustion.
Optionally, please refer to step 301 for the content of this step, which is not described herein again in this embodiment of the present application.
And 402, in response to the dioxin in the fly ash is cracked, performing secondary combustion on the cracked gas, wherein the cracked gas comprises carbon substances, and the carbon substances are incompletely combusted during the secondary combustion to form carbon monoxide and carbon dioxide.
Wherein, the oxygen-enriched content in the oxygen-enriched melting furnace simultaneously meets the oxygen demand for heating the fly ash and the oxygen demand for cracking the dioxin.
And 403, staying chlorine substances generated by cracking dioxin in the oxygen-enriched melting furnace for continuous heating, wherein the chlorine substances react with the residual calcium oxide in the fly ash to form calcium chloride.
Because chlorine substances are generated after cracking of dioxin is completed, the chlorine substances generated by cracking of dioxin are retained in the oxygen-enriched melting furnace to be continuously heated, and the toxic chlorine substances are subjected to harmless treatment.
Step 404, filtering and recovering the calcium chloride.
Further, calcium chloride obtained through innocent treatment is filtered and recycled.
Carbon monoxide and carbon dioxide are discharged from the first outlet, step 405.
And 406, acquiring the gas flow monitored by the flowmeter at preset intervals through the height adjusting device, and determining the height adjusting quantity of the secondary combustion chamber according to the gas flow, the discharge area and the preset reaction time.
The height adjusting device is arranged at the second combustion chamber, the flowmeter is arranged at the first outlet, the preset reaction time is the gas reaction time in the second combustion chamber, and the discharge area is the cross-sectional area of the second inlet.
In one possible embodiment, the second combustion chamber height is:
the second combustion chamber height (gas flow/discharge area in the preset interval) is the gas reaction time.
Carbon monoxide and carbon dioxide are delivered to the second inlet via the closed channel, step 407.
And step 408, starting the heat exchanger to exchange heat with the gas in the second combustion chamber.
In one possible embodiment, the high-temperature gas in the second combustion chamber is subjected to waste heat utilization, such as heat exchange with water, to obtain hot water.
And 409, responding to the fact that the carbon monoxide is fully oxidized to form carbon dioxide in the oxygen-enriched environment of the secondary combustion chamber, and discharging the gas in the secondary combustion chamber after reaching the standard through a second outlet.
Optionally, please refer to step 304 for the content of this step, which is not described herein again in this embodiment of the present application.
In the embodiment of the application, the flow of the first outlet airflow is accurately monitored through the flow meter, and the adjusting accuracy of the height adjusting device is further improved.
In the embodiment of the application, the intelligent adjustment of the height of the second combustion chamber is realized by arranging the height adjusting device, the manpower monitoring cost is saved, and the operation accuracy is also improved.
In the embodiment of the application, the method also comprises harmless treatment and recovery of chlorine substances, so that the recovery rate of the fly ash is further improved.
In the embodiment of the application, the heat exchange of the high-temperature gas in the second combustion chamber is further carried out, so that the utilization rate of reactants is further improved.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (10)

1. An apparatus for eliminating dioxin in fly ash, comprising: the system comprises an oxygen-enriched smelting furnace, a secondary combustion chamber and a heat exchanger, wherein the oxygen-enriched smelting furnace provides an oxygen-enriched environment, and the content of oxygen enriched in the oxygen-enriched environment is more than or equal to 40%;
the oxygen-enriched smelting furnace is provided with a first inlet and a first outlet, the second combustion chamber is provided with a second inlet and a second outlet, the first outlet is connected with the first inlet through a closed channel, the heat exchanger is connected with the second outlet, the oxygen-enriched smelting furnace is used for heating fly ash input by the first inlet, dioxin in the fly ash is cracked under the heating condition to generate carbon monoxide and carbon dioxide, the second combustion chamber is used for oxidizing the carbon monoxide to generate the carbon dioxide, the heat exchanger is used for carrying out heat exchange on gas in the second combustion chamber, and the second outlet is used for discharging the gas after heat exchange after reaching the standard;
the height of the second combustion chamber is obtained according to the gas flow of the first outlet, the discharge area and the preset reaction time, wherein the preset reaction time is the gas reaction time in the second combustion chamber, and the discharge area is the cross-sectional area of the second inlet.
2. The abatement device of claim 1, wherein the first outlet is provided with a flow meter for monitoring a gas flow rate of the first outlet.
3. The abatement device of claim 2, wherein the secondary combustion chamber is of a collapsible design and is provided with a height adjustment device for taking the gas flow monitored by the flow meter at preset intervals and determining a height adjustment for the secondary combustion chamber based on the gas flow, the discharge area and the preset reaction time.
4. An abatement device according to any one of claims 1 to 3, wherein the inner wall of said secondary combustion chamber is of refractory material;
the bottom of the second combustion chamber is provided with at least 2 rows of grooves, the 2 rows of grooves are designed in a spiral rising mode, and the 2 rows of grooves are used for promoting the gas flow in the second combustion chamber.
5. A method for removing dioxins in fly ash, which is applied to the device for removing dioxins in fly ash according to any one of claims 1 to 4, comprising:
feeding the fly ash into the oxygen-enriched smelting furnace through the first inlet for primary combustion, wherein the temperature range of the primary combustion is 1350-1500 ℃;
in response to completion of cracking of dioxins in the fly ash, post-cracking gas is subjected to post-combustion, the post-cracking gas including carbon species, wherein the carbon species are incompletely combusted at the post-combustion to form carbon monoxide and carbon dioxide;
delivering the carbon monoxide and the carbon dioxide from the first outlet to the second inlet through the closed passage into the secondary combustion chamber, wherein the secondary combustion chamber is provided with the oxygen-enriched environment;
and responding to the sufficient oxidation of the carbon monoxide in the oxygen-enriched environment of the secondary combustion chamber to form carbon dioxide, and performing standard emission on the gas in the secondary combustion chamber through the second outlet.
6. The method of claim 5, wherein the oxygen-rich content in the oxygen-rich furnace is such that the oxygen demand for fly ash heating and the oxygen demand for dioxin cracking are both satisfied.
7. The method of claim 5, wherein said delivering said carbon monoxide and said carbon dioxide to said secondary combustion chamber through said closed channel comprises:
discharging the carbon monoxide and the carbon dioxide from the first outlet;
delivering the carbon monoxide and the carbon dioxide to the second inlet through the closed channel.
8. The method of claim 7, wherein after discharging the carbon monoxide and the carbon dioxide from the first outlet, the method further comprises:
the gas flow monitored by the flowmeter is obtained in the preset interval through the height adjusting device, and the height adjusting quantity of the secondary combustion chamber is determined according to the gas flow, the discharge area and the preset reaction time, wherein the height adjusting device is arranged at the secondary combustion chamber, the flowmeter is arranged at the first outlet, the preset reaction time is the gas reaction time in the secondary combustion chamber, and the discharge area is the cross sectional area of the second inlet.
9. The method according to any one of claims 5 to 8, wherein chlorine species are also generated after completion of the decomposition of dioxin;
after the post-combustion of the cracked gas, the method further comprises:
the chlorine substance generated by cracking the dioxin is retained in the oxygen-enriched melting furnace to be heated continuously, wherein the chlorine substance reacts with the residual calcium oxide in the fly ash to form calcium chloride;
and filtering and recovering the calcium chloride.
10. The method of any one of claims 5 to 8, wherein prior to discharging the gas from the secondary combustion chamber through the second outlet, the method further comprises:
and starting the heat exchanger to perform the heat exchange on the gas in the secondary combustion chamber.
CN202011530112.XA 2020-12-22 2020-12-22 Device and method for eliminating dioxin in fly ash Active CN112762459B (en)

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