CN110131731A - Reduce the refuse burning system and method for dioxin - Google Patents
Reduce the refuse burning system and method for dioxin Download PDFInfo
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- CN110131731A CN110131731A CN201910444333.6A CN201910444333A CN110131731A CN 110131731 A CN110131731 A CN 110131731A CN 201910444333 A CN201910444333 A CN 201910444333A CN 110131731 A CN110131731 A CN 110131731A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/007—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by irradiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/32—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by electrical effects other than those provided for in group B01D61/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/869—Multiple step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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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
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The present invention discloses a kind of refuse burning system and method for reducing dioxin, and refuse burning system includes waste incinerator, high-temperature heat-exchanging, hot precipitator, nitrogen oxides and carbonaceous material decomposer, cryogenic heat exchanger and flue gas purification device；The dioxin that the dust that hot precipitator is collected does not have dioxin low temperature to synthesize, small toxicity；Exhaust gas dust concentration after high-temperature dust removal is low, and, pollution small to the abrasion of nitrogen oxides and carbonaceous material decomposer catalyst less, extends catalyst life, improves chemical reaction efficiency；Within the scope of 200 DEG C to 400 DEG C of the low temperature synthesis temperature section of dioxin, the dust concentration of flue gas is low, lack dust catalyst needed for dioxin low temperature synthesizes, the carbon particle and carbonaceous organic material concentration of flue gas are low, substance needed for lacking the synthesis of dioxin low temperature, significantly reduces the low temperature synthetic quantity of dioxin.
Description
Technical field
The present invention relates to garbage incineration technology, in particular to a kind of refuse burning system for reducing dioxin and its side
Method.
Background technique
The advantages such as incineration treatment of garbage has minimizing, innoxious, recycling is obvious, are promoted and applied rapidly.
But nitrogen oxides is not only generated during incineration treatment of garbage, also generation extremely toxic substance dioxin (Dioxins) threatens people
The living environment of class.During incineration treatment of garbage, the generating mode of dioxin includes: to generate in furnace and low temperature in back-end ductwork
Synthesis.
Pass through " 3T+E " technique, that is, control: residence time in furnace of incineration temperature, flue gas, flue gas gas-solid turbulence journey
Degree and excessive air amount, can effectively control generation of the dioxin in furnace.The low temperature composition principle of dioxin in back-end ductwork
It is in the range of 200 DEG C to 400 DEG C of back-end ductwork flue-gas temperature, certain metallic compounds in flying dust make catalyst, by rubbish
The carbon particle and carbonaceous organic material of inabundant after-flame are reacted with chlorine element generates dioxin.Due to the fire box temperature of waste incinerator
At 800 DEG C or more, and the flue gas of chimney entrance it is general at 200 DEG C hereinafter, waste incineration generate flue gas necessarily undergo two evils
The temperature region of English low temperature synthesis, necessarily occurs the low temperature synthetic reaction of dioxin.In order to avoid caused by waste incineration two
It dislikes English to enter in atmosphere with flue gas, garbage burning factory sprays into active carbon, absorption cigarette in gas cleaning processing, in back-end ductwork
Dioxin in gas, and active carbon is trapped by dust-extraction unit and is entered in the flying dust of deduster collection, finally with winged
Ash is discharged into environment, and the dioxin in flying dust causes environmental risk.
Summary of the invention
To overcome above-mentioned the deficiencies in the prior art, it is an object of the present invention to provide a kind of waste incinerations for reducing dioxin
System and method remove flying dust and nitrogen oxides in flue gas, and remove smoke middle carbon particle and carbonaceous organic material, effectively prevent rubbish
The low temperature of dioxin synthesizes, reduces the total emission volumn of dioxin in rubbish burning process.
To achieve the above object, the technical solution adopted by the present invention is that:
Reduce the refuse burning system of dioxin, including waste incinerator, high-temperature heat-exchanging, hot precipitator, nitrogen
Oxide and carbonaceous material decomposer, cryogenic heat exchanger and flue gas purification device；
The smoke outlet of the waste incinerator is connected with the high-temperature heat-exchanging, high-temperature heat-exchanging exhanst gas outlet with it is described
Hot precipitator is connected, and hot precipitator removes most of solid matter such as dust, carbon particle in flue gas, hot precipitator
Exhanst gas outlet is connected with nitrogen oxides and carbonaceous material decomposer, makes cigarette by nitrogen oxides and carbonaceous material decomposer
Nitrogen oxides in gas is transformed into nitrogen and water；Carbonaceous organic material in flue gas in remaining carbon particle and flue gas generates two
Carbonoxide and water；Nitrogen oxides and carbonaceous material decomposer exhanst gas outlet connect cryogenic heat exchanger, and cryogenic heat exchanger flue gas goes out
Mouth connection flue gas purification device, flue gas empty after flue gas purification device purifies.
Further, the nitrogen oxides and carbonaceous material decomposer are that the selective catalytic denitrification process is catalyzed combustion integrative dress
It sets, the selective catalytic denitrification process catalysis combustion integrative device includes flue and is mounted in flue along flow of flue gas direction successively
The selective catalytic reduction denitration device and catalytic combustion system of setting, in the smoke inlet of selective catalytic reduction denitration device
It is provided with reducing agent spray head.
Further, the nitrogen oxides and carbonaceous material decomposer are that the selective catalytic denitrification process plasma is integrally disguised
It sets, the selective catalytic denitrification process plasma integrated apparatus includes flue, and is mounted in flue successively along flow of flue gas
The selective catalytic reduction denitration device and plasma generator of direction setting, near selective catalytic reduction denitration device
It is provided with reducing agent spray head, the controller for controlling op plasma generator is provided with outside flue.
Further, the nitrogen oxides and carbonaceous material decomposer are that the selective catalytic denitrification process is photocatelysis oxidation integrated
Device, the photocatelysis oxidation integrated device of the selective catalytic denitrification process include flue and are mounted in flue along flow of flue gas
The selective catalytic reduction denitration device and photocatalytic oxidation device that direction is set gradually, in selective catalytic reduction denitration device
It nearby is provided with reducing agent spray head, photocatalytic oxidation device is provided with power supply.
Further, the light source of the photocatalytic oxidation device of the photocatelysis oxidation integrated device of the selective catalytic denitrification process is
Ultraviolet light.
Further, the photocatalysis of the photocatalytic oxidation device of the photocatelysis oxidation integrated device of the selective catalytic denitrification process
Agent is titanium dioxide.
Further, the denitrating catalyst of the selective catalytic reduction denitration device is with TiO2For carrier, with V2O5Based on
Active ingredient is wanted, with WO3、MoO3For anti-oxidant, antitoxinization auxiliary ingredients.
Further, the catalyst for catalytic combustion of the selective catalytic reduction denitration device is palladium catalyst, platinum catalyst
Or non-noble metal oxide catalyst.
Further, temperature sensor is set in hot precipitator exhanst gas outlet position, is monitored by temperature sensor
Flue-gas temperature.
The garbage incineration method for reducing dioxin, includes the following steps:
Step 1: by waste incinerator waste incineration generate high-temperature flue gas be passed through high-temperature heat-exchanging to high-temperature flue gas into
Row cooling, is reduced to 450 DEG C ± 50 DEG C for flue-gas temperature；
Step 2: the flue gas after cooling is passed through hot precipitator and is dusted purified treatment, and hot precipitator removes flue gas
In most of solid matter such as dust, carbon particle；
Step 3: enter nitrogen oxides and carbonaceous material decomposer, flue gas by the purified flue gas of hot precipitator
In nitrogen oxides be transformed into nitrogen and water；Carbonaceous organic material in flue gas in remaining carbon particle and flue gas generates dioxy
Change carbon and water；
Step 4: the flue gas after completing dust separation, the selective catalytic denitrification process and catalysis burning is passed through cryogenic heat exchanger, leads to
It crosses cryogenic heat exchanger and flue-gas temperature is reduced to 200 DEG C or less；
Step 5: low-temperature flue gas enters flue gas purification device, completes depickling, dedusting, removing dioxin control techniques heel row
It is empty.
The beneficial effects of the present invention are:
(1) flue gas of waste incineration discharge of the present invention temperature after high-temperature heat-exchanging cools down reaches 450 DEG C ± 50 DEG C, then
Flue gas is dusted purification through hot precipitator, this temperature range is higher than the low temperature synthesis temperature range of dioxin, will not occur
The synthesis of dioxin, the concentration of dioxin is low in flying dust, small toxicity.Therefore, dioxin contained by the flying dust that hot precipitator is collected
Content is low, is discharged into environment low by dioxin bring environmental risk.
By the purification of hot precipitator, the flying dust concentration in flue gas is greatly lowered, remaining waste incineration in flue gas
Uncombusted carbon particle is also collected by hot precipitator, and the uncombusted carbon particle concentration in corresponding flue gas also significantly drops
It is low.
(2) flue gas enters nitrogen oxides and carbonaceous material decomposer after leaving hot precipitator, in nitrogen oxides and contains
NO_x formation nitrogen and water in carbonizable substance decomposer in flue gas；Remaining carbon particle and flammable carbon containing have in flue gas
Machine object and oxygen occur catalyst combustion reaction in the catalyst surface of nitrogen oxides and carbonaceous material decomposer and generate titanium dioxide
Carbon and water；It carries in flue gas and is removed in nitrogen oxides and carbonaceous material decomposer, eliminate most of dioxin low temperature and close
At necessary uncompleted burned carbon particle and carbonaceous organic material.
(3) flue gas enters cryogenic heat exchanger after leaving nitrogen oxides and carbonaceous material decomposer, and flue-gas temperature is reduced to
Although 200 DEG C hereinafter, flue gas undergone in cryogenic heat exchanger dioxin low temperature generate 400 DEG C to 200 DEG C of temperature range,
It is that the dioxin total amount that low temperature generates is considerably less, is because of remaining most of uncompleted burned carbon particle and carbon containing in (a) flue gas
Organic matter is removed by hot precipitator and nitrogen oxides and carbonaceous material decomposer, lacks the object of dioxin low temperature generation
Matter condition；(b) flying dust in flue gas removes in hot precipitator, and flying dust is the catalyst of dioxin low temperature synthesis,
Lead to the catalysts conditions for lacking the synthesis of dioxin low temperature in cryogenic heat exchanger, lack material conditions and catalysts conditions, two dislike
English can not low temperature generate, have significant economic benefit and environmental benefit.
(4) since flue gas carbonaceous material decomposer removes, low temperature generation dioxin amount is considerably less, the dioxin in flue gas
Total amount is considerably less, and the dioxin total amount collected by flue gas purification device is considerably less, and therefore, the dioxin being discharged into environment is total
Measure considerably less, environmental risk is greatly lowered.
(5) due to the catharsis for the hot precipitator being arranged before nitrogen oxides and carbonaceous material decomposer, flue gas
Enter nitrogen oxides and carbonaceous material decomposer after leaving hot precipitator, the flying dust concentration in flue gas is greatly lowered, and drops
Low flying dust is to the erosive wear of nitrogen oxides and carbonaceous material decomposer and to nitrogen oxides and carbonaceous material decomposer
Catalyst pollution, the service life of the catalyst of nitrogen oxides and carbonaceous material decomposer and chemical reactivity obtain substantially
Degree extends, and the selective catalytic denitrification process reaction of nitrogen oxides and carbonaceous material decomposer and catalyst combustion reaction effect obtain greatly
Amplitude improves.
Detailed description of the invention
Fig. 1 is system structure diagram of the invention
Fig. 2 is that the selective catalytic denitrification process is catalyzed combustion integrative apparatus structure schematic diagram in the present invention
Fig. 3 is the selective catalytic denitrification process plasma integrated apparatus structural schematic diagram in the present invention
Fig. 4 is the photocatelysis oxidation integrated apparatus structure schematic diagram of the selective catalytic denitrification process in the present invention
In figure: 1- waste incinerator, 2- high-temperature heat-exchanging, 3- hot precipitator, 4- temperature sensor, 5- nitrogen oxides and
Carbonaceous material decomposer, 50- the selective catalytic denitrification process are catalyzed combustion integrative device, the selective-catalytic-reduction denitrified dress of 501-
It sets, 502- catalytic combustion system, 503- reducing agent spray head, 51- the selective catalytic denitrification process plasma integrated apparatus, 511- etc.
Plasma generator, 512- controller, the photocatelysis oxidation integrated device of 52- the selective catalytic denitrification process, 521- photochemical catalytic oxidation
Device, 522- power supply, 6- cryogenic heat exchanger, 7- flue gas purification device.
Specific embodiment
Present invention is further described in detail combined with specific embodiments below, but not as a limitation of the invention.
As shown in Figure 1, the present invention reduces the refuse burning system of dioxin, including the heat exchange of waste incinerator 1, high temperature
Device 2, hot precipitator 3, temperature sensor 4, nitrogen oxides and carbonaceous material decomposer 5, cryogenic heat exchanger 6, gas cleaning
Device 7.
The smoke outlet of the waste incinerator 1 is connected with the high-temperature heat-exchanging 2, by high-temperature heat-exchanging 2 to rubbish
The high-temperature flue gas that incinerator 1 is discharged cools down, and 2 exhanst gas outlet of high-temperature heat-exchanging is connected with the hot precipitator 3,
Hot precipitator removes most of solid matter such as dust, carbon particle in flue gas, 3 exhanst gas outlet of hot precipitator and nitrogen oxidation
Object and carbonaceous material decomposer 5 connect, by nitrogen oxides and carbonaceous material decomposer 5 by nitrogen oxides, remaining carbon
The removing such as particle, carbonaceous organic material is decomposed, and nitrogen oxides and 5 exhanst gas outlet of carbonaceous material decomposer connect cryogenic heat exchanger
6, flue-gas temperature is reduced to 200 DEG C hereinafter, 6 exhanst gas outlet of cryogenic heat exchanger connects gas cleaning dress by cryogenic heat exchanger 6
7 are set, further completes to purify through flue gas purification device, flue gas is discharged into atmosphere under conditions of meeting environment protection emission requirement.
Temperature sensor 4 is set in 3 exhanst gas outlet position of hot precipitator, flue-gas temperature is monitored by temperature sensor 4,
Then the burning condition for adjusting waste incinerator 1 guarantees that high-temperature flue gas is reduced to 450 DEG C ± 50 DEG C through 2 temperature of high-temperature heat-exchanging.
The dedusting material of the hot precipitator 3 can use porous metals filtering material, can also use porous ceramics
Filtering material or other porous composite filter materials.
As shown in Fig. 2, the nitrogen oxides and carbonaceous material decomposer are the selective catalytic denitrification process catalysis burning one
Makeup sets 50, the selective catalytic reduction set gradually along flow of flue gas direction for specifically including flue and being mounted in flue
Denitrification apparatus (SCR) 501 and catalytic combustion system 502, in the smoke inlet of selective catalytic reduction denitration device (SCR) 501
Side is provided with reducing agent spray head 5033, sprays reducing agent by reducing agent spray head 503, the purified flue gas of hot precipitator enters
After the selective catalytic denitrification process is catalyzed combustion integrative device (SCRCB) 50, following three types mainly occur in SCRCB device 50 and urge
Change reaction:
1, it is anti-to carry out selective catalytic reduction under the effect of the catalyst for the nitrogen oxides in flue gas and the reducing agent of penetrating
It answers, be transformed into nitrogen and water；
2, the carbonaceous organic material in carbon particle remaining in flue gas and flue gas occurs with oxygen under the effect of the catalyst
Catalyst combustion reaction generates carbon dioxide and water.
SCRCB device 50 has the function of that the selective catalytic denitrification process and catalysis combustion function, catalyst for catalytic combustion can be
Noble metal catalyst palladium or platinum, are also possible to non-precious metal catalyst, as the oxide of cadmium metal, manganese Metal oxide,
Oxide, the oxide of cobalt metal or the oxide of copper metal of ferrous metal, catalyst matrix can also be porous ceramic matrices suitable,
It is also possible to porous metal matrix, can also be porous complex matrix, the type of catalyst for catalytic combustion can be single kind and urge
Agent is also possible to the composite catalyst that multiple catalysts are combined together composition.
The denitrating catalyst of the selective catalytic denitrification process catalysis combustion integrative device 50 is with TiO2For carrier, with
V2O5For main active ingredient, with WO3、MoO3For anti-oxidant, antitoxinization auxiliary ingredients；The pattern of denitrating catalyst is board-like, bee
Socket is corrugated plate dst.
As shown in figure 3, the nitrogen oxides and carbonaceous material decomposer are the selective catalytic denitrification process plasma one
(SCRCP) 51 is set in makeup, specifically includes flue, and 501 He of selective catalytic reduction denitration device (SCR) being mounted in flue
Plasma generator 511, selective catalytic reduction denitration device (SCR) 501 and plasma generator 511 are successively along flue gas
Flow direction setting, is provided with reducing agent spray head 503 near SCR device, reducing agent is sprayed by former agent spray head 503, in cigarette
The controller 512 for controlling the work of plasma generator 511 is provided with outside road.The plasma generator 511
Plasma is Equilibrium plasma, i.e. high-temperature plasma, or is non-equilibrium plasma, i.e. low-temperature plasma
Body.
After the purified flue gas of hot precipitator enters SCRCP device 51, using the catalytic action of catalyst, mainly
Following three types reaction occurs:
1, it is anti-to carry out selective catalytic reduction under the effect of the catalyst for the nitrogen oxides in flue gas and the reducing agent of penetrating
It answers, be transformed into nitrogen and water；
2, it is anti-under plasma effect oxidation to occur for the carbonaceous organic material in carbon particle remaining in flue gas and flue gas
It answers, generates carbon dioxide and water.
The SCRCP device 51 is the selective catalytic denitrification process plasma integrated apparatus, has the selective catalytic denitrification process
The selective catalytic reduction of function, the carbon particle in corona treatment flue gas, the function of organic compound, SCRCP device is de-
The catalyst of nitre device 501 is with TiO2For carrier, with V2O5For main active ingredient, with WO3、MoO3For anti-oxidant, antitoxinization
Auxiliary ingredients, the pattern of the catalyst of selective catalytic reduction denitration device 501 are board-like, perhaps be honeycomb fashion or are wave
Card formula.
As shown in figure 4, the nitrogen oxides and carbonaceous material decomposer are the selective catalytic denitrification process photochemical catalytic oxidation one
(SCRPCO) 52 is set in body makeup, the selection set gradually along flow of flue gas direction for specifically including flue and being mounted in flue
Property catalytic reduction denitration device (SCR) 501 and photocatalytic oxidation device 521, at selective catalytic reduction denitration device (SCR)
501 are nearby provided with reducing agent spray head 503, spray reducing agent by reducing agent spray head 503, photocatalytic oxidation device 521 is arranged
After thering is power supply 522, the purified flue gas of hot precipitator to enter SCRPCO device 52, mainly occur such as in SCRPCO device 52
Lower three classes catalysis reaction:
1, it is anti-to carry out selective catalytic reduction under the effect of the catalyst for the nitrogen oxides in flue gas and the reducing agent of penetrating
It answers, be transformed into nitrogen and water；
2, the carbonaceous organic material in carbon particle remaining in flue gas and flue gas under photocatalytic oxidation with oxygen oxygen
Change reaction, generates carbon dioxide and water.
SCRPCO device 52 is the integrally makeup of selective catalyst reduction of nitrogen oxides catalyst, photocatalytic oxidation reactor
It sets, has the function of the selective catalytic denitrification process, the carbon particle in photocatalysis removing flue gas, carbonaceous organic material, the catalysis of SCRPCO device
Agent is with TiO2For carrier, with V2O5For main active ingredient, with WO3、MoO3For anti-oxidant, antitoxinization auxiliary ingredients, photocatalysis
The photochemical catalyst of oxidation unit 521 is titanium dioxide.
Based on above-mentioned refuse burning system, the present invention also provides a kind of garbage incineration method for reducing dioxin,
Include the following steps:
Step 1: being passed through high-temperature heat-exchanging for the high-temperature flue gas that waste incineration in waste incinerator 1 generates and cool down, cigarette
Temperature degree is reduced to 450 DEG C ± 50 DEG C；
Step 2: the flue gas after cooling is passed through hot precipitator and is dusted purified treatment, and hot precipitator removes flue gas
In most of solid matter such as dust, carbon particle；
Step 3: enter nitrogen oxides and carbonaceous material decomposer 5 by the purified flue gas of hot precipitator, in nitrogen
Nitrogen oxides in oxide and carbonaceous material decomposer 5 in flue gas is transformed into nitrogen and water；Remaining carbon particle in flue gas,
And the carbonaceous organic material catalysis burning in flue gas generates carbon dioxide and water；
Step 4: the flue gas after completing dust separation, the selective catalytic denitrification process and catalysis burning is passed through cryogenic heat exchanger, leads to
It crosses cryogenic heat exchanger 6 and flue-gas temperature is reduced to 200 DEG C or less；
Step 5: low-temperature flue gas enters flue gas purification device, after completing the control techniques such as depickling, dedusting, removing dioxin,
Meet and is discharged into atmosphere under conditions of environment protection emission requirement.
Finally it should be noted that: the above examples are only used to illustrate the technical scheme of the present invention rather than its limitations, to the greatest extent
Pipe is described the invention in detail referring to above-described embodiment, it should be understood by those ordinary skilled in the art that: still may be used
With modifications or equivalent substitutions are made to specific embodiments of the invention, and repaired without departing from any of spirit and scope of the invention
Change or equivalent replacement, should all cover in present claims range.
Claims (10)
1. reducing the refuse burning system of dioxin, it is characterised in that: including waste incinerator (1), high-temperature heat-exchanging
(2), hot precipitator (3), nitrogen oxides and carbonaceous material decomposer (5), cryogenic heat exchanger (6) and flue gas purification device
(7)；
The smoke outlet of the waste incinerator (1) is connected with the high-temperature heat-exchanging (2), high-temperature heat-exchanging (2) exhanst gas outlet
It is connected with the hot precipitator (3), hot precipitator removes most of solid matter such as dust, carbon particle in flue gas,
Hot precipitator (3) exhanst gas outlet is connected with nitrogen oxides and carbonaceous material decomposer (5), by nitrogen oxides and carbon containing
Decomposition device (5) makes the nitrogen oxides in flue gas be transformed into nitrogen and water；In flue gas in remaining carbon particle and flue gas
Carbonaceous organic material generate carbon dioxide and water；Nitrogen oxides and carbonaceous material decomposer (5) exhanst gas outlet connection low temperature change
Hot device (6), cryogenic heat exchanger (6) exhanst gas outlet connect flue gas purification device (7), and flue gas purifies heel row through flue gas purification device
It is empty.
2. the refuse burning system according to claim 1 for reducing dioxin, it is characterised in that: the nitrogen oxides
And carbonaceous material decomposer (5) is that the selective catalytic denitrification process is catalyzed combustion integrative device (50), the selective catalytic denitrification process is urged
Change combustion integrative device to include flue and be mounted on the selective catalysis set gradually in flue along flow of flue gas direction also
Former denitrification apparatus (501) and catalytic combustion system (502) are set in the smoke inlet of selective catalytic reduction denitration device (501)
It is equipped with reducing agent spray head (503).
3. the refuse burning system according to claim 1 for reducing dioxin, it is characterised in that: the nitrogen oxides
And carbonaceous material decomposer (5) is the selective catalytic denitrification process plasma integrated apparatus (51), the selective catalysis is de-
Nitre plasma integrated apparatus (51) includes flue, and is mounted in flue successively along the selectivity of flow of flue gas direction setting
Catalytic reduction denitration device (501) and plasma generator (511), near selective catalytic reduction denitration device (501)
Reducing agent spray head (503) are provided with, the controller for controlling plasma generator (511) work is provided with outside flue
(512)。
4. the refuse burning system according to claim 1 for reducing dioxin, it is characterised in that: the nitrogen oxides
And carbonaceous material decomposer (5) is the photocatelysis oxidation integrated device of the selective catalytic denitrification process (52), the selective catalysis
The photocatelysis oxidation integrated device of denitration (52) includes that flue and being mounted in flue is set gradually along flow of flue gas direction
Selective catalytic reduction denitration device (501) and photocatalytic oxidation device (521), in selective catalytic reduction denitration device
(501) it is nearby provided with reducing agent spray head (503), photocatalytic oxidation device (521) is provided with power supply (522).
5. the refuse burning system according to claim 4 for reducing dioxin, it is characterised in that: the selectivity is urged
The light source for changing the photocatalytic oxidation device (522) of the photocatelysis oxidation integrated device of denitration (52) is ultraviolet light.
6. the refuse burning system according to claim 4 for reducing dioxin, it is characterised in that: the selectivity is urged
The photochemical catalyst for changing the photocatalytic oxidation device (521) of the photocatelysis oxidation integrated device of denitration (52) is titanium dioxide.
7. reducing the refuse burning system of dioxin according to claim 2,3 or 4, it is characterised in that: the choosing
The denitrating catalyst of selecting property catalytic reduction denitration device (501) is with TiO2For carrier, with V2O5For main active ingredient, with
WO3、MoO3For anti-oxidant, antitoxinization auxiliary ingredients.
8. reducing the refuse burning system of dioxin according to claim 2,3 or 4, it is characterised in that: the choosing
The catalyst for catalytic combustion of selecting property catalytic reduction denitration device (501) is palladium catalyst, platinum catalyst or non-noble metal oxide
Catalyst.
9. the refuse burning system according to claim 1-6 for reducing dioxin, it is characterised in that: in institute
Hot precipitator (3) exhanst gas outlet position setting temperature sensor (4) is stated, monitors flue-gas temperature by temperature sensor (4).
10. the garbage incineration method of the reduction dioxin based on refuse burning system described in claim 1, it is characterised in that
Include the following steps:
Step 1: the high-temperature flue gas that waste incineration in waste incinerator (1) generates is passed through high-temperature heat-exchanging (2) to high-temperature flue gas
Cool down, flue-gas temperature is reduced to 450 DEG C ± 50 DEG C；
Step 2: the flue gas after cooling is passed through hot precipitator (3) and is dusted purified treatment, and hot precipitator (3) removes cigarette
The major part solid matter such as dust, carbon particle in gas；
Step 3: enter nitrogen oxides and carbonaceous material decomposer (5), cigarette by hot precipitator (3) purified flue gas
Nitrogen oxides in gas is transformed into nitrogen and water；Carbonaceous organic material in flue gas in remaining carbon particle and flue gas generates two
Carbonoxide and water；
Step 4: the flue gas after completing dust separation, the selective catalytic denitrification process and catalysis burning is passed through cryogenic heat exchanger (6), leads to
It crosses cryogenic heat exchanger (6) and flue-gas temperature is reduced to 200 DEG C or less；
Step 5: low-temperature flue gas enters flue gas purification device (7), completes depickling, dedusting, removing dioxin control techniques heel row
It is empty.
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Cited By (1)
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