CN114963185A - Method for filtering pollutants by coupling medical waste high-temperature pyrolysis gasification and low-nitrogen combustion with dry type electric filter - Google Patents
Method for filtering pollutants by coupling medical waste high-temperature pyrolysis gasification and low-nitrogen combustion with dry type electric filter Download PDFInfo
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Images
Classifications
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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
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
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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
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/04—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment drying
-
- 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
- F23G5/10—Incineration of waste; Incinerator constructions; Details, accessories or control therefor having supplementary heating electric
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/44—Details; Accessories
-
- 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
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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 method for filtering pollutants by medical waste through high-temperature pyrolysis gasification-low-nitrogen combustion coupling dry-type electric filtration, which comprises the steps of feeding the medical waste into a pyrolysis incinerator through a feeding machine, cracking organic matters in the medical waste into combustible mixed gas at 850-1600 ℃ without oxygen or oxygen deficiency, enabling the cracked gas to enter a secondary combustion chamber for combustion under the condition of oxygen enrichment, enabling high-temperature flue gas after combustion to enter a partition wall heating chamber of the pyrolysis incinerator through a pipeline, connecting a heat exchanger with the partition wall heating chamber of the pyrolysis incinerator, enabling high-temperature tail gas to exchange heat with blown oxygen in the heat exchanger, and enabling the heated oxygen to enter the secondary combustion chamber; the tail gas discharged from the heat exchanger enters a Venturi mixer, is mixed with alkaline nano particles, then enters a dry reactor and an electric filter reactor, and the purified gas is led to a chimney by a draught fan and is discharged into the atmosphere; the removal rate of organic matters reaches 99%, and the generation of harmful substances such as dioxin is reduced; realizing the harmless treatment of the garbage.
Description
Technical Field
The invention relates to the technical field of medical waste treatment, in particular to a method for filtering pollutants by coupling high-temperature pyrolysis gasification-low-nitrogen combustion dry-type electric filtration of medical waste.
Background
The medical waste refers to waste which is generated by medical institutions in medical treatment, prevention, health care and other related activities and has direct or indirect infectivity, toxicity and other harmfulness, and specifically comprises infectious, pathological, traumatic, medicinal and chemical waste, wherein the waste contains a large amount of bacterial viruses, and if the waste is not properly treated, the waste can cause serious pollution to the environment and can also become a source of epidemic diseases. Through the development of the recent 20 years, the incineration disposal technology taking a rotary kiln and a fixed bed as the core and the non-incineration disposal technology taking high-temperature steam, chemistry, microwave, high-temperature dry heat and the like as the core are widely applied. The medical waste is basically treated by incineration at home and abroad, the incineration method can realize harmless, quantitative reduction and resource treatment of the waste at the fastest speed, and has the advantage of occupying less land resources, but the waste gas and residue generated by the incineration process have great influence on the environment and can also generate serious dioxin, so that the environment is seriously polluted secondarily, an additional production line is required to be added to purify gas pollutants, and therefore, technical innovation is required to be carried out to solve the specific problems.
Disclosure of Invention
In order to overcome the defects that the pollution of medical waste to the environment is serious day by day and the harmless, quantitative-reducing and resource-recycling treatment of the medical waste cannot be realized in the prior art, the invention provides a medical waste treatment method, the structure and parameters of a pyrolysis incinerator are optimized to realize high cracking rate, the whole incinerator body is strictly sealed to realize anaerobic cracking and maximize gas production, as the pyrolysis temperature is high, the incineration process is complete, the volume reduction of solid particles is high, and the removal rate of organic matters reaches 99%, the subsequent treatment cost effect is greatly reduced, and the high-temperature flue gas of a secondary combustion chamber is conveyed to the pyrolysis incinerator to serve as a heat source for maintaining the temperature of the incinerator body, the use of fuel is reduced, and the cost is reduced; the incineration tail gas is subjected to dry reaction and electric filtration technology after being subjected to waste heat recovery by a heat exchanger, and is discharged after reaching standards, so that secondary pollution to the environment is avoided.
The method comprises the steps of feeding medical waste into a pyrolysis incinerator through a feeding machine, and cracking organic matters in the medical waste into combustible mixed gas at 850-1600 ℃ in the absence of oxygen or oxygen, wherein the pyrolysis incinerator comprises a pyrolysis chamber and a partition wall heating chamber surrounding the outside of the pyrolysis chamber; the cracked gas enters a secondary combustion chamber to be combusted under the condition of oxygen-enriched gas, high-temperature flue gas after combustion enters a partition wall heating chamber of the pyrolysis incinerator through a pipeline, a heat exchanger is connected with a high-temperature tail gas outlet of the partition wall heating chamber of the pyrolysis incinerator, the high-temperature tail gas exchanges heat with oxygen blown in by an air compressor in the heat exchanger, and the heated oxygen is introduced into the secondary combustion chamber; and tail gas discharged from the heat exchanger enters a Venturi mixer, is mixed with alkaline nano particles, then enters a dry reactor to remove sulfides in the tail gas and remove dust preliminarily, finally enters an electric filtration reactor to remove fine dust and pollutants remained in the tail gas, and the purified gas is introduced into the atmosphere through a draught fan.
An electromagnetic heating coil is arranged on the outer wall of the lower part of the pyrolysis chamber of the pyrolysis incinerator and used for providing energy required by pyrolysis starting, and after high-temperature reaction is started, circulating flue gas introduced into a partition wall heating chamber can continuously provide heat for the pyrolysis process; the pyrolysis chamber upper portion is opened has pyrolysis chamber exhanst gas outlet and communicates with the second combustion chamber flue gas entry of second combustion chamber, and the second combustion chamber flue gas entry of second combustion chamber is provided with electric arc lighter, and the second combustion chamber bottom is provided with fuel gas compensation mouth for supply the gas when flue gas output reduces and have sufficient temperature in order to ensure that the flue gas burning, the second combustion chamber lower part is opened and is had the air inlet of oxygen entry and oxygen entry for the tangential admission, and second combustion chamber high temperature exhanst gas outlet is opened on second combustion chamber upper portion.
The garbage in the pyrolysis incinerator moves from top to bottom by gravity, a drying layer, a pyrolysis layer and a slag layer are formed from top to bottom in the incinerator, and the medical garbage is preheated, dried, pyrolyzed and gasified in the pyrolysis incinerator to form ash; the garbage entering the pyrolysis incinerator is dried by the smoke gas generated by pyrolysis at the upper part of the pyrolysis incinerator, the moisture in the garbage volatilizes, and the garbage forms ash slag at the bottom layer in the incinerator along with the continuous rise of the temperature, so that the cracking rate of organic components in the medical garbage reaches more than 99 percent, and the reduction effect is good; simultaneously, air carried by the garbage feed and water vapor and CO generated in the cracking process by the humidity of the air 2 Reacts with the incandescent carbon layer to generate water gas, so that the gas production rate in the whole process is large.
Combustible mixed gas generated by garbage pyrolysis enters the secondary combustion chamber through the flue gas inlet of the secondary combustion chamber, the combustion temperature is controlled to be not lower than 1100 ℃, the generation of dioxin is reduced, air is uniformly introduced from the oxygen inlet in a tangential direction, the flue gas can generate strong turbulence in the secondary combustion chamber, and sufficient residence time is provided. The high-temperature flue gas is introduced into a partition wall heating chamber of the pyrolysis incinerator through a high-temperature flue gas outlet of the second combustion chamber, on one hand, heat energy is provided for the pyrolysis furnace, recycling of an additional heat value is achieved, on the other hand, unburnt and complete gas in the combustible gas is combusted again, and generation of pollutants is further reduced.
The dry reactor is a conventional commercial reactor and is used for removing sulfides in tail gas and primarily removing dust.
The electric filter reactor is used for removing fine dust remained in tail gas and various pollutants in flue gas so as to reach the specified flue gas emission standard and reduce the pollution to the environment; the reactor is a technology disclosed by the inventor, and specifically refer to patents CN201410368552.8, CN202010853319.4, CN201810351642.4, CN201910212368.7 and the like.
The electromagnetic heating device arranged on the outer wall of the pyrolysis chamber of the pyrolysis furnace is used for providing energy required by pyrolysis startingAnd after the high-temperature reaction is started, the circulating flue gas introduced into the dividing wall heating chamber can continuously provide heat for the pyrolysis section. In the whole process, combustion-supporting substances are not required to be additionally added into the pyrolysis chamber, and the waste is dried, heated and pyrolyzed in the furnace, so that the high-temperature pyrolysis can be realized and the reaction temperature is maintained at 850-1600 ℃. The pyrolysis furnace can crack macromolecular substances into combustible low-molecular substances such as hydrogen, methane, carbon monoxide and the like at high temperature under the condition of oxygen deficiency or oxygen-free, and liquid products such as tar, solvent oil and the like can greatly reduce Cr which has great harm to human bodies 2+ And NO x Gas is generated, and the content of harmful components in the gas is reduced.
The alkaline nano-particles comprise sodium bicarbonate, lime powder, calcium hydroxide and the like, and acidic substances in the smoke gas undergo a neutralization reaction when passing through the region.
The invention has the beneficial effects that:
1. according to the invention, the medical waste is treated by high-temperature pyrolysis, and organic matters in the waste are converted into combustible mixed gas, so that the medical waste is completely cracked, and the combustible gas has high conversion rate and has the characteristics of high reduction degree and small secondary pollution;
2. the high-temperature pyrolysis treatment method is used, medical garbage is pyrolyzed and gasified in an oxygen-free or oxygen-deficient environment, the content of dioxin in generated flue gas is extremely low, harmful gas is greatly reduced, and harmlessness of the flue gas is realized;
3. the medical waste is treated by using a high-temperature pyrolysis technology, and high-temperature flue gas is recycled to heat the furnace body, so that heat is provided for the pyrolysis of the medical waste, the heat utilization efficiency of the pyrolysis furnace is improved, and the energy consumption is reduced;
4. the auxiliary desulfurization tail gas purification and dry reaction and electric filtration treatment facility can ensure that no secondary pollutant is generated in the incineration treatment process of the medical waste;
the technical scheme of the invention is easy to realize, convenient to couple with an intelligent control system, low in initial investment and beneficial to market popularization.
Drawings
FIG. 1 is a schematic diagram of a process route of the present invention;
in the figure: 1-a feeding machine; 2-pyrolysis incinerator; 3-a second combustion chamber; 4-a heat exchanger; 5-a venturi mixer; 6-a dry reactor; 7-electrofiltration reactor; 8-induced draft fan; 9-a chimney; 10-an air compressor; 11-oxygen inlet; 12-fuel compensation port; 13-second combustion chamber flue gas inlet; 14-arc sparker; 15-high-temperature flue gas outlet of the second combustion chamber; 16-a partition heating chamber; 17-an electromagnetic heating coil; 18-a pyrolysis chamber; 19-a pyrolysis chamber flue gas outlet; 20-a high-temperature tail gas outlet of the partition wall heating chamber.
Detailed Description
Referring to the drawings and the embodiment, the process of the present invention will be further described in detail, as shown in fig. 1, the apparatus used in the following embodiment comprises a feeding machine 1, a pyrolysis incinerator 2, a secondary combustion chamber 3, a heat exchanger 4, a venturi mixer 5, a dry reactor 6, and an electric filter reactor 7, the feeding machine 1 is communicated with a feeding port at the top of the pyrolysis incinerator 2, the pyrolysis incinerator 2 comprises a pyrolysis chamber 18 and a partition wall heating chamber 16 surrounding the pyrolysis chamber, a pyrolysis chamber flue gas outlet 19 is opened at the upper part of the pyrolysis incinerator and is communicated with the pyrolysis chamber 18, a partition wall heating chamber high temperature tail gas outlet 20 is opened at the upper part of the pyrolysis incinerator and is communicated with the partition wall heating chamber 16, a clinker outlet is opened at the bottom of the pyrolysis incinerator 2 and is communicated with the pyrolysis chamber, an electromagnetic heating coil 17 connected with a power supply is wound on the outer wall at the lower part of the pyrolysis chamber 18, the pyrolysis chamber flue gas outlet 19 is communicated with the secondary combustion chamber flue gas inlet 13 of the secondary combustion chamber 3 through a pipeline, a dividing wall heating chamber high-temperature tail gas outlet 20 is connected with a tail gas inlet of a heat exchanger 4 through a pipeline, a tail gas outlet of the heat exchanger 4 is connected with a dry reactor 6 through a Venturi mixing device 5, an oxygen inlet of the heat exchanger 4 is connected with an air compressor 10, an oxygen outlet of the heat exchanger 4 is communicated with an oxygen inlet 11 of a secondary combustion chamber, air inlet of the oxygen inlet 11 is tangential air inlet, an electric arc igniter 14 is arranged on one side of a secondary combustion chamber flue gas inlet 13 of the secondary combustion chamber and is positioned in the secondary combustion chamber, a fuel compensation port 12 is arranged at the lower part of the secondary combustion chamber, a secondary combustion chamber high-temperature flue gas outlet 15 is formed at the upper part of the secondary combustion chamber, the secondary combustion chamber high-temperature flue gas outlet 15 is communicated with a dividing wall heating chamber 16 through a pipeline, and an electric filtration reactor 7 is communicated with a chimney 9 through an induced draft fan 8;
example 1:
in this embodiment, the above device is used for treating medical waste, the medical waste is uniformly and quantitatively fed into the pyrolysis incinerator 2 through the spiral feeding machine 1, the waste entering the pyrolysis incinerator 2 moves from top to bottom by gravity, the electromagnetic heating coil 17 is turned on to provide heat for pyrolysis starting, the temperature of the waste in the pyrolysis chamber 18 is controlled to be not lower than 1100 ℃ under the anaerobic environment or anaerobic condition, along with the rise of the temperature, organic matters in the waste are cracked to form combustible mixed flue gas, the combustible mixed gas is discharged through the flue gas outlet 19 of the pyrolysis chamber and enters the secondary combustion chamber 3 through the flue gas inlet 13 of the secondary combustion chamber to be combusted, the temperature is controlled to be not lower than 1100 ℃, the combusted high-temperature flue gas is conveyed to the partition wall heating chamber 16 through the high-temperature flue gas outlet 15 of the secondary combustion chamber to provide heat for the pyrolysis process, and the recycled high-temperature tail gas is discharged from the high-temperature tail gas outlet 20 of the partition wall heating chamber, the waste heat is recovered in a heat exchanger 4, the heated oxygen is introduced into a secondary combustion chamber 3 through an oxygen inlet 11 after the high-temperature tail gas exchanges heat with the oxygen, the tail gas enters a Venturi mixer 5 after heat exchange, sodium bicarbonate is added, then the tail gas enters a dry reactor 6, acidic substances in the flue gas and the sodium bicarbonate undergo a neutralization reaction and are subjected to primary dust removal, and then the acidic substances and the sodium bicarbonate enter an electric filtration reactor 7 to remove fine dust and various pollutants in the flue gas remained in the tail gas; the purified induced draft fan 8 leads the purified induced draft fan to a chimney 9 and discharges the purified induced draft fan into the atmosphere;
in the embodiment, the medical waste is dried, heated, pyrolyzed and gasified from top to bottom in the pyrolysis incinerator 2, the waste in the pyrolysis incinerator sequentially passes through the drying layer, the pyrolysis layer and the slag layer, namely, the entered waste is dried by the rising flue gas of the pyrolysis layer, the moisture in the waste is volatilized, then the waste is pyrolyzed and gasified, and is decomposed into combustible substances such as carbon monoxide, gaseous hydrocarbons and the like to form combustible mixed flue gas, and the waste forms ash slag at the bottom layer in the incinerator along with the continuous rising of the temperature; at the same time, the air carried by the garbage feed and the steam and CO generated in the cracking process by the humidity of the air 2 Reacts with the incandescent carbon layer to generate water gas, so that the gas production rate in the whole process is large.
In the embodiment, the oxygen inlet 11 of the secondary combustion chamber 3 supplies oxygen tangentially and uniformly, so that strong turbulence can be generated in the flue gas in the secondary combustion chamber 3, sufficient retention time is provided, and dioxin can be effectively removed; the fuel compensation port 12 supplements the fuel gas when the flue gas production decreases to ensure that the flue gas is burning at a sufficient temperature.
Through the treatment of the process, the volume of the generated waste residues is 5% of the total volume of the medical waste before reaction, and the volume reduction rate of the medical waste reaches 95%.
The high-temperature pyrolysis incinerator consists of a middle pyrolysis chamber and a partition wall heating chamber surrounding the outside, an induced draft fan is arranged at the last section of the equipment, all systems are connected through a pipeline, and the induced draft fan induces air at the rear end to enable smoke to pass through all units from front to back; heating and cracking the inner chamber by self-heating through electromagnetic heating and combustible mixed gas combustion (the heating temperature is between 850 ℃ and 1600 ℃), cracking the garbage in the heating process to generate combustible mixed gas, and introducing the combustible mixed gas into a secondary combustion chamber for high-temperature combustion (the combustion temperature is not lower than 1100 ℃); the secondary combustion chamber is internally provided with an air guide system which has uniform oxygen supplement and enough volume, so that the combustible gas is combusted in a secondary combustion chamber in a vortex manner, the retention time of the flue gas is prolonged, and the retention time is more than 2 seconds; alkaline nano-particles are added to the tail gas purification section by the Venturi mixer, the components are mixed into the reactor to react with acidic components in the flue gas, acid gas is removed at a higher temperature, the tail gas does not need to be further cooled, and the electric filtration purification of multiple pollutants ensures that secondary pollution to the environment cannot be caused.
The main component of the medical waste is organic matter, the combustible gas generated by thermal cracking of the medical waste generates combustion heat value for self-heating, so that the harmless treatment of the medical waste is realized, the cracking rate can be greatly improved due to the design of optimizing cracking and burning, and simultaneously, the air carried by the waste and the water vapor and CO generated in the cracking process by the humidity of the air and the air are simultaneously used for feeding the waste 2 The water gas is generated by the reaction with the incandescent carbon layer, so that the gas yield of the pyrolysis gasification of the medical waste is maximized. The tail gas generated by medical waste incineration is discharged after reaching standards after desulfurization, dust removal and electric filtration of multiple pollutants, and no secondary pollutant causes new pollution to the environment in the whole treatment process.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (4)
1. A method for filtering pollutants by medical waste high-temperature pyrolysis gasification-low-nitrogen combustion coupling dry-type electricity is characterized by comprising the following steps: feeding medical waste into a pyrolysis incinerator through a feeding machine, and cracking organic matters in the medical waste into combustible mixed gas at 850-1600 ℃ in the absence of oxygen or oxygen, wherein the pyrolysis incinerator comprises a pyrolysis chamber and a partition wall heating chamber surrounding the pyrolysis chamber; the cracked gas enters a secondary combustion chamber to be combusted under the oxygen-enriched condition, the combusted high-temperature flue gas enters a partition wall heating chamber of the pyrolysis incinerator through a pipeline, a heat exchanger is connected with a high-temperature tail gas outlet of the partition wall heating chamber of the pyrolysis incinerator, the high-temperature tail gas exchanges heat with oxygen blown in by an air compressor in the heat exchanger, and the heated oxygen is introduced into the secondary combustion chamber; and tail gas discharged from the heat exchanger enters a Venturi mixer, is mixed with alkaline nano particles, then enters a dry reactor to remove sulfides in the tail gas and remove dust preliminarily, finally enters an electric filtration reactor to remove fine dust and pollutants remained in the tail gas, and the purified gas is introduced into the atmosphere through a draught fan.
2. The method for filtering out multiple pollutants by medical waste high-temperature pyrolysis gasification-low-nitrogen combustion coupling dry-type electricity according to claim 1, characterized in that: be provided with electromagnetic heating device on the pyrolysis chamber lower part outer wall of pyrolysis incinerator, pyrolysis chamber upper portion is opened have pyrolysis chamber exhanst gas outlet and with the second combustion chamber flue gas entry intercommunication of second combustion chamber, the second combustion chamber flue gas entry of second combustion chamber is provided with electric arc lighter ware, second combustion chamber bottom is provided with fuel compensation mouth for supplementary fuel has sufficient temperature in order to ensure the flue gas burning when the gas output reduces, the second combustion chamber lower part is opened the admission that has oxygen entry and is admitted air for the tangential, second combustion chamber upper portion is opened there is second combustion chamber high temperature exhanst gas outlet.
3. The method for filtering out multiple pollutants by medical waste high-temperature pyrolysis gasification-low-nitrogen combustion coupling dry-type electricity according to claim 1, characterized in that: the alkaline nanoparticles comprise sodium bicarbonate, lime powder and calcium hydroxide.
4. The method for filtering out multiple pollutants by medical waste high-temperature pyrolysis gasification-low-nitrogen combustion coupling dry-type electricity according to claim 1, characterized in that: the combustion temperature in the second combustion chamber is not lower than 1100 ℃.
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