CN109012124A - A kind of dangerous waste incineration flue gas depth denitration purification system and method - Google Patents
A kind of dangerous waste incineration flue gas depth denitration purification system and method Download PDFInfo
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- CN109012124A CN109012124A CN201811124016.8A CN201811124016A CN109012124A CN 109012124 A CN109012124 A CN 109012124A CN 201811124016 A CN201811124016 A CN 201811124016A CN 109012124 A CN109012124 A CN 109012124A
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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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
- B01D53/8628—Processes characterised by a specific catalyst
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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
- F23G5/46—Recuperation of heat
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2067—Urea
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The present invention relates to a kind of dangerous waste incineration flue gas depth denitration purification system, including rotary kiln, incubation cavities, secondary combustion chamber, urea liquid spray gun, afterheat boiler system, flue gas quenching tower, extracting tower, deduster, Benitration reactor, activated carbon and fixed bed, air-introduced machine, tubular type GGH heat exchanger, desulfurizing tower, demister, chimney and the water-seal slag-scraping machine for collecting lime-ash；First smoke inlet of tubular type GGH heat exchanger is connected with activated carbon and fixed bed, first outlet flue of tubular type GGH heat exchanger is connected with the smoke inlet of desulfurizing tower, the outlet flue of desulfurizing tower is connected with the second smoke inlet of tubular type GGH heat exchanger, and the second outlet flue of tubular type GGH heat exchanger is connected with chimney.The present invention not only can effectively recycle rotary kiln dispersed heat, guarantee flue gas qualified discharge simultaneously, and can realize ultra-low emission of NOx, whole system is structurally reasonable, technically reliable, clean and effective, is suitble to the popularization and use of Cities with Great Population and small towns garbage as resource treatment industry.
Description
Technical field
The invention belongs to the environment protection fields of garbage disposal, are related to medical hazardous waste processing technology field, and in particular to one
Kind dangerous waste incineration flue gas depth denitration purification system and method.
Background technique
Clinical waste includes the waste of the forms such as solid-state, semisolid and liquid, because containing a large amount of bacteriums, virus, has life
Object toxicity, infectiousness, harmfulness and corrosivity.Once it is mishandling, easily resident's health and social environment are caused sternly
It endangers again, therefore becomes the object of countries in the world emphasis prevention and control, " National Hazard waste register " is also included in by China.Both at home and abroad to doctor
Treating treatment of wastes produced technology mainly has the skills such as burning disposal, disinfection with high pressure steam, plasma treatment, microwave treatment, radiation treatment
Art is influenced by factors such as technology, fund, environmental requirement, operating costs, and burning disposal minimizing and harmless treatment effect are prominent
Out, at home using more.With the raising of Environmental Protection in China emission request, the discharge index tightening of various pollutants is necessarily to become
Gesture.Under the background that power generation industry minimum discharge has generally been implemented, other corresponding Air Pollutant Emission source ratios
As Industrial Stoves will also be faced with the environmental requirement of transformation and upgrade.
With Re-search on Urbanization progress faster, Urban Medical Wastes yield is being gradually risen, especially metropolitan doctor
Treatment waste processing environmental requirement is high and usually faces addressing difficult problem.Using rotary kiln incineration clinical waste or other danger
Waste has a clear superiority, but it must be ensured that the thorough innoxious and incineration flue gas qualified discharge of waste, avoids secondary
Pollution prevents from generating contradiction with nearby residents.
" cement kiln synergic processing solid waste environmental protection technology specification (HJ 662-2013) " regulation is met certain condition
Cement kiln can be with cooperative disposal danger wastes.Cement industry mostly uses kiln.Compared to the pyrolysis for waste incineration
The advantages of gasification furnace, grate furnace and fluid bed furnace, rotary kiln is can to burn plurality of liquid and solid, can individually feed intake, also may be used
Mixed material feeding, solid waste can continuously be put into, and can also be put into batches.The disadvantage is that rotary kiln wall surface temperature is often at 250 DEG C or more, it is hot
Efficiency is lower, and flue gas NOx discharge and dust content are high.
Summary of the invention
The technical problem to be solved by the present invention is to the presence that lower for the rotary kiln thermal efficiency, NOx emission concentration is high, has
The problem of white plume, provides the more stable reliable hazardous waste flue gas energy saving of one kind and deep purifying NOx is complete
Apparatus system, it is ensured that every discharge index reaches or better than national emission standard requirement, is provided simultaneously with realization and is similar to ultralow row
Put the ability of standard requirements.
To achieve the above object, the present invention adopts the following technical scheme that:
It is an object of the present invention to provide a kind of dangerous waste incineration flue gas depth denitration purification systems comprising revolution
Kiln, the incubation cavity for being arranged in outside the rotary kiln and being connected with the rotary kiln are connected with the rotary kiln
The urea liquid spray gun in the second-time burning room is arranged in secondary combustion chamber, is connected with the secondary combustion chamber
Afterheat boiler system, the flue gas quenching tower being connected with the afterheat boiler system are connected with the flue gas quenching tower
Extracting tower, the deduster being connected with the extracting tower, the Benitration reactor being connected with the deduster is and described
The activated carbon and fixed bed that is connected of Benitration reactor, be arranged in the Benitration reactor and the activated carbon and fixed bed it
Between for pushing flue gas to enter the air-introduced machine of the activated carbon and fixed bed, there is the first smoke inlet, the second smoke inlet, first go out
The tubular type GGH heat exchanger of mouth and the second outlet flue, the desulfurizing tower with smoke inlet and outlet flue, is arranged in the desulfurizing tower
Interior demister, chimney and the water-seal slag-scraping machine for collecting lime-ash；First smoke inlet of the tubular type GGH heat exchanger with
The activated carbon and fixed bed is connected, the first outlet flue of the tubular type GGH heat exchanger and the desulfurizing tower into cigarette
Mouth is connected, and the outlet flue of the desulfurizing tower is connected with the second smoke inlet of the tubular type GGH heat exchanger, the pipe
Second outlet flue of formula GGH heat exchanger is connected with the chimney.
The present invention is arranged by the way that the flue gas after desulfurization is entered the chimney after the tubular type GGH heat exchanger heating
It puts, avoids the appearance of white plume.
Specifically, the dangerous waste incineration flue gas depth denitration purification system further includes being connected with the rotary kiln
A logical wind apparatus, high heating value waste feedstock device and low heat value waste feedstock device, is connected with the incubation cavity
Overfire air device.The present invention is sent into rotary kiln after being preheated by setting incubation cavity to the Secondary Air for auxiliary combustion and helps
Combustion, improves the thermal efficiency of rotary kiln, so as to reach energy-efficient effect.
More specifically, the dangerous waste incineration flue gas depth denitration purification system further includes waste transport storage and pre-
Handle crushing system, the described waste transport storage and pretreatment crushing system and the high heating value waste feedstock device and low
Calorific value waste feedstock device is connected.
The present invention by being arranged urea liquid spray gun, the NH that urea pyrolysis generates in the secondary combustion chamber3For restoring
NOx, to effectively control the yield of NOx in combustion process.
Specifically, the urea liquid spray gun is located at 850~1050 DEG C of the secondary combustion chamber of section.
Specifically, the urea liquid spray gun is divided into multilayer setting, and every layer has multiple urea liquid spray guns.
Preferably, secondary combustion chamber is on the basis of flow field simulation optimization and cool power field are adjusted, 850~1050
DEG C temperature range, is rationally provided with 2~4 layers of urea liquid spray gun, the production quantity of NOx is reduced using SNCR principle, as burning
First step that control NOx is generated in the process.
Preferably, the dangerous waste incineration flue gas depth denitration purification system further includes and the waste heat boiler system
It unites the drum being connected, the steam turbine generating device that is connected with the drum.
Preferably, the deduster is bag filter.
Specifically, the dangerous waste incineration flue gas depth denitration purification system further includes for anti-to the denitration
Device is answered to provide NH3Urea hydrolyser, the steam steam air heater for being heated to air, respectively with the hydrolysis of urea
The mixer that device, the steam steam air heater are connected with the Benitration reactor.
Preferably, the dangerous waste incineration flue gas depth denitration purification system further includes and the waste heat boiler system
The reducing-and-cooling plant that system is connected, the reducing-and-cooling plant are connected with the urea hydrolyser.
The present invention is avoided nowhere sharp after steam generation by the setting of steam turbine generating device or reducing-and-cooling plant
With the problem of causing energy waste.
According to a kind of embodiment, the top of the Benitration reactor has the cigarette being connected with the deduster
Road, the area of section of the Benitration reactor are 2.5~10 times of the flue cross section area, and space occupied is small, described
Benitration reactor in fine pith low form SCR catalyst is installed.
Wherein, the low form SCR catalyst refers to the SCR catalyst for being suitble to be reacted at 180~240 DEG C.Institute
The Benitration reactor entirety denitration efficiency stated significantly reduces the concentration of emission of nitrogen oxides up to 80% or more.Fine pith refers to
Pitch is 3~5mm.
According to another embodiment, the dangerous waste incineration flue gas depth denitration purification system further includes that setting exists
Smoke-heating device between the deduster and the Benitration reactor is equipped with high temperature in the Benitration reactor
Type SCR catalyst.
Wherein, the high temperature modification SCR catalyst refers to the catalyst for being suitble to be reacted at 300 DEG C -350 DEG C, therefore,
According to high temperature modification SCR catalyst, then need that flue-gas temperature is increased to 300 DEG C -350 DEG C by Smoke-heating device.
Second step of the Benitration reactor as control NOx emission, can make the NOx finally discharged in flue gas dense
Degree is lower than the 50mg/m of minimum discharge standard3。
Specifically, the nozzle for injection desulfurization agent is provided in the desulfurizing tower, the demister is located at described
Nozzle top.
System is purified using the dangerous waste incineration flue gas depth denitration it is a further object to provide a kind of
The method that system purifies hazardous waste, includes the following steps:
(1) proportion for controlling dangerous waste material, auxiliary fuel and combustion air, so that into the material in the rotary kiln
Calorific value within the set range；
(2) material is burned by the rotary kiln, controlling the temperature in the rotary kiln is 850
~1050 DEG C；
(3) flue gas that burning generates in the rotary kiln described in enters the secondary combustion chamber and burns, described in adjusting
Secondary combustion chamber burner in fuel quantity and air capacity match so that the secondary combustion chamber Outlet Gas Temperature
It is 900~1100 DEG C, controls the flue gas at residence time > 2 seconds of the secondary combustion chamber, controls described secondary
Oxygen content at combustor exit is 6~12%；
(4) flue gas in the secondary combustion chamber exit described in enters the afterheat boiler system and cools down, and controls institute
The flue-gas temperature in the afterheat boiler system exit stated is 280~400 DEG C；
(5) flue gas in the afterheat boiler system exit described in is dropped into the flue gas quenching tower from top to bottom
Temperature, the flue-gas temperature for controlling the flue gas quenching tower exit is 180~230 DEG C, controls the flue gas in the cigarette
Residence time was less than 1 second in cold tower out of breath；
(6) after the flue gas in the flue gas quenching tower exit described in is by the extracting tower deacidification, then pass through described remove
Then dirt device dedusting from top to bottom enters the Benitration reactor and removes NOx, then pushes flue gas to enter by the air-introduced machine
The activated carbon and fixed bed removes dioxin, heavy metallic oxide microparticle and part dust；
(7) flue gas in the activated carbon and fixed bed exit described in passes through the first smoke inlet of the tubular type GGH heat exchanger
Into the tubular type GGH heat exchanger, the desulfurizing tower is then entered by the first outlet flue of the tubular type GGH heat exchanger
Smoke inlet, pass through the demister and the desulfurizing agent being arranged in the desulfurizing tower carry out demisting and desulfurization process；
(8) flue gas of the outlet flue of the desulfurizing tower described in is entered by the second smoke inlet of the tubular type GGH heat exchanger
The tubular type GGH heat exchanger controls the flue-gas temperature at the second outlet flue of the tubular type GGH heat exchanger and is greater than 80 DEG C；
(9) flue gas at the second outlet flue of the tubular type GGH heat exchanger described in is discharged by the chimney；
(10) lime-ash of each section falls into the water-seal slag-scraping machine.
In the present invention, the calorific value of setting range is that system reaches stable burning and qualified discharge principle is set according to making
It sets.
Preferably, when the calorific value of the material is more than the setting range, industry is added into the material
Sludge or waste liquid.
Preferably, the sulfur elimination is the NaOH solution that mass concentration is 20~30%.
Due to the implementation of above technical scheme, the invention has the following advantages over the prior art:
The present invention not only can effectively recycle rotary kiln dispersed heat, while guarantee flue gas qualified discharge, and can realize
Ultra-low emission of NOx, whole system is structurally reasonable, technically reliable, clean and effective, is suitble to Cities with Great Population and small towns waste resources
Change the popularization and use for the treatment of industry.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of specific embodiment.
Specific embodiment
Below will by specific embodiment, the present invention is further explained, but the protection scope being not intended to restrict the invention.
Those skilled in the art can be made improvements to preparation method and using instrument within the scope of the claims, these improvement also should be regarded as
Protection scope of the present invention.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
As shown in Figure 1, a kind of dangerous waste incineration flue gas depth denitration purification system, including waste transport storage and pre- place
Crushing system, rotary kiln 03 are managed, a wind apparatus, high heating value waste feedstock device and the low heat value being connected with rotary kiln 03 are given up
Expect feeding device 01, the incubation cavity 04 that rotary kiln 03 is outer and is connected with rotary kiln 03 is set, is connected with incubation cavity 04
The urea liquid spray gun in secondary combustion chamber 05 is arranged in overfire air device, the secondary combustion chamber 05 being connected with rotary kiln 03
06, the afterheat boiler system 09 being connected with secondary combustion chamber 05, the drum 08 being connected with afterheat boiler system 09, with drum
08 steam turbine generating device 07 being connected, the flue gas quenching tower 10 being connected with afterheat boiler system 09, with flue gas quenching tower
10 extracting towers 21 being connected, the bag filter 22 being connected with extracting tower 21, the denitration reaction being connected with deduster 22
Device 24, for providing NH to Benitration reactor 243Urea hydrolyser, the steam for being heated to air (dilution wind) is warm
Wind device, the mixer being connected respectively with urea hydrolyser, steam steam air heater and Benitration reactor 24, with afterheat boiler system 09
The reducing-and-cooling plant being connected, the activated carbon and fixed bed 26 being connected with Benitration reactor 24 are arranged in Benitration reactor 24
For pushing flue gas to enter the air-introduced machine 25 of activated carbon and fixed bed 26 between activated carbon and fixed bed 26, have the first smoke inlet,
The tubular type GGH heat exchanger 27 of second smoke inlet, the first outlet flue and the second outlet flue, the desulfurizing tower with smoke inlet and outlet flue
29, the demister 28 of the top inside desulfurizing tower 29 is set, the nozzle for injection desulfurization agent is provided in desulfurizing tower 29, is removed
Day with fog 28 is located at the top of nozzle, chimney 30 and the water-seal slag-scraping machine for collecting lime-ash；The first of tubular type GGH heat exchanger 27
Smoke inlet is connected with activated carbon and fixed bed 26, the smoke inlet phase of the first outlet flue and desulfurizing tower 29 of tubular type GGH heat exchanger 27
Connection, the outlet flue of desulfurizing tower 29 is connected with the second smoke inlet of tubular type GGH heat exchanger 27, and the of tubular type GGH heat exchanger 27
Two outlet flues are connected with chimney 30, and reducing-and-cooling plant is connected with urea hydrolyser.
Mountable high temperature modification SCR catalyst 31 or low form SCR catalyst 31 in Benitration reactor 24.If installing low
Warm type SCR catalyst 31, the then cigarette that the area of section of denitration reaction 24 is connected for the top of denitration reaction 24 with deduster 22
2.5~10 times of the area of section in road are equipped with fine pith low form SCR catalyst 31 in Benitration reactor 24.If installation is high
Warm type SCR catalyst 31, then dangerous waste incineration flue gas depth denitration purification system further includes being arranged in deduster 22 and denitration
Smoke-heating device (such as electric heater or high-temperature steam heating) between reactor 24 is equipped with height in Benitration reactor 24
Warm type SCR catalyst 31.Therefore, consider for energy conservation and environmental protection, it is preferred to use low form SCR catalyst 31.
A variety of material-uploading styles are set according to feed material difference, so that system reaches stable burning and emission compliance operates to
Principle, the solid waste disposed on demand and liquid waste amount are proportionally added into, and control incinerating waste material collocation is in stable calorific value model
In enclosing, and by the amount of this calorific value setting auxiliary fuel and combustion air.When the calorific value of clinical waste is excessively high, low heat value can be mixed
Industrial sludge or waste liquid；Higher waste dispersion is measured to individual sulfur-bearings (S), chlorine (Cl) to burn, and avoids excessively entering furnace,
To exceed the margin range of downstream fume gas purification device, lead to discharge beyond standards.
Clinical waste enters rotary kiln 03, First air through high heating value waste feedstock device and low heat value waste feedstock device 01
Device provides First air into rotary kiln 03, after the Secondary Air that overfire air device provides flows through the chamber of incubation cavity 04 and is preheated
It is passed through rotary kiln 03, clinical waste is slowly mobile to kiln tail portion with 03 barrel body rotation of rotary kiln, and the rotation of kiln body makes material
It is come into full contact with during burning with combustion air, completes heating, drying, is pyrolyzed and burns process.Rotary kiln 03 keeps one
Fixed gradient and revolving speed operation, waste material will essentially become ash content when reaching discharge port and enter ash-slag disposal system.
Secondary combustion chamber 05 is on the basis of flow field simulation optimization and cool power field are adjusted, in 850~1050 DEG C of temperature
Section is rationally provided with 2~4 layers of urea liquid spray gun 06, and every layer has multiple urea liquid spray guns 06, is reduced using SNCR principle
The production quantity of NOx, as first step for controlling NOx generation in combustion process.
The flue gas that burning generates subsequently enters secondary combustion chamber 05, and the harmful substance not burnt does further burning.Just
Often when production, by adjusting the fuel quantity of 05 burner of secondary combustion chamber and the proportion of air capacity, secondary combustion chamber 05 is kept to go out
Mouth flue-gas temperature is about at 1100 DEG C or so, in residence time > 2 second of secondary burning room, the oxygen content 6~12% in exit.?
In this burning process, urea liquid is sprayed by urea liquid spray gun 06, the ammonia that urea pyrolysis generates can restore in flue gas
NOx, so that the NOx generated is controlled in 100-400mg/m3, realize that nitrogen drops in source.
1100 DEG C or so of the high-temperature flue gas that secondary combustion chamber 05 comes out, into afterheat boiler system 09, the steam of generation
It is mainly used for the power generation of steam turbine generating device 07, fraction supplies after passing through reducing-and-cooling plant decrease temperature and pressure to urea hydrolyser
Heat.Flue gas (temperature is at 280~400 DEG C) after the cooling of afterheat boiler system 09 from top to bottom enters flue gas quenching tower 10, with
The water sprayed into flue gas quenching tower 10 is quickly exchanged heat, and flue-gas temperature can be down to 200 DEG C or so in a short time.Flue gas is in urgency
Residence time in cold tower, the harmful substance that can effectively avoid in flue gas synthesized dioxin again less than 1 second.
The flue gas come out from flue gas quenching tower 10 contains dioxin, HCl, SO2, NOx, heavy metal ion etc. it is various poisonous and harmful
Substance, it is necessary to be removed by downstream fume gas purification system, avoid secondary environmental pollution.
After the flue gas come out from flue gas quenching tower 10 is deacidified by extracting tower 21, then by 22 dedusting of deduster, then by
The upper and lower Benitration reactor 24 that enters removes NOx, so that NOx is not higher than 50mg/m3, then overcome flue gas system to hinder by air-introduced machine 25
Power pushes flue gas to enter active carbon and fixes 26) removing dioxin, heavy metallic oxide microparticle and dust.
The flue gas come out from activated carbon and fixed bed 26 enters tubular type GGH by the first smoke inlet of tubular type GGH heat exchanger 27
Then heat exchanger 27 is entered the smoke inlet of desulfurizing tower 29 by the first outlet flue of tubular type GGH heat exchanger 27, in desulfurizing tower 29 into
Row desulfurization and by 28 demisting of demister, the desulfurizing agent sprayed in desulfurizing tower 29 is that the NaOH that mass fraction is 20~30% is molten
Liquid.
The flue gas come out from the outlet flue of desulfurizing tower 29 enters tubular type by the second smoke inlet of tubular type GGH heat exchanger 27
GGH heat exchanger 27 controls the flue-gas temperature at the second outlet flue of tubular type GGH heat exchanger 27 and is greater than 80 DEG C.
The flue gas come out from the second outlet flue of tubular type GGH heat exchanger 27 is discharged by chimney 30；To avoid white cigarette
The appearance of plumage.
The non-flammable inorganic matter and lime-ash of each section (such as rotary kiln 03, secondary combustion chamber 05) fall into water-seal slag-scraping
Machine, the waste residue that water-seal slag-scraping machine is sent out are collected into turnover box, and security landfill field is sent to dispose.
The system, which has thoroughly decomposed clinical waste organic principle, realizes minimizing purpose, and incineration flue gas is also realized innoxious
Processing.
The present invention can realize that the small hourly value of NOx is not higher than in the flue gas of medical wastes incineration discharge by Benitration reactor 24
50mg/m3, required reducing agent ammonia is provided by urea liquid hydrolyzer, final to discharge better than national " dangerous waste incineration atmosphere
Pollutant emission standard " 400mg/m as defined in (exposure draft, ring do letter [2014] 1386)3Standard limited value.Benefit of the invention
It is heated up with tubular type GGH heat exchanger 27 to neat stress, is effectively prevented from the generation of white plume.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (13)
1. a kind of dangerous waste incineration flue gas depth denitration purification system, it is characterised in that: it includes rotary kiln (03), and setting exists
The incubation cavity (04) that the rotary kiln (03) is connected outside and with the rotary kiln (03), with described rotary kiln (03) phase
The urea liquid spray gun (06) in the secondary combustion chamber (05) is arranged in the secondary combustion chamber (05) of connection, and described
The afterheat boiler system (09) that secondary combustion chamber (05) is connected, the flue gas being connected with the afterheat boiler system (09) are anxious
Cold tower (10), the extracting tower (21) being connected with the flue gas quenching tower (10) are connected with the extracting tower (21)
Deduster (22), the Benitration reactor (24) being connected with the deduster (22), with described Benitration reactor (24) phase
The activated carbon and fixed bed (26) of connection, is arranged between the Benitration reactor (24) and the activated carbon and fixed bed (26)
For push flue gas enter the activated carbon and fixed bed (26) air-introduced machine (25), have the first smoke inlet, the second smoke inlet,
The tubular type GGH heat exchanger (27) of first outlet flue and the second outlet flue, the desulfurizing tower (29) with smoke inlet and outlet flue, setting
Demister (28) in the desulfurizing tower (29), chimney (30) and the water-seal slag-scraping machine for collecting lime-ash；Described
First smoke inlet of tubular type GGH heat exchanger (27) is connected with the activated carbon and fixed bed (26), the tubular type GGH heat exchange
First outlet flue of device (27) is connected with the smoke inlet of the desulfurizing tower (29), the outlet flue of the desulfurizing tower (29) with
Second smoke inlet of the tubular type GGH heat exchanger (27) is connected, the second outlet flue of the tubular type GGH heat exchanger (27)
It is connected with the chimney (30).
2. dangerous waste incineration flue gas depth denitration purification system according to claim 1, it is characterised in that: the danger
Dangerous incineration of waste flue gas depth denitration purification system further includes wind apparatus, a high fever being connected with the rotary kiln (03)
It is worth waste feedstock device and low heat value waste feedstock device (01), the overfire air device being connected with the incubation cavity (04).
3. dangerous waste incineration flue gas depth denitration purification system according to claim 1, it is characterised in that: the urine
Plain solution spray gun (06) is located at 850~1050 DEG C of section of the secondary combustion chamber (05).
4. dangerous waste incineration flue gas depth denitration purification system according to claim 1 or 3, it is characterised in that: described
Urea liquid spray gun (06) be divided into multilayer setting, every layer has multiple urea liquid spray guns (06).
5. dangerous waste incineration flue gas depth denitration purification system according to claim 1, it is characterised in that: the danger
Dangerous incineration of waste flue gas depth denitration purification system further include the drum (08) being connected with the afterheat boiler system (09),
The steam turbine generating device (07) being connected with the drum (08).
6. dangerous waste incineration flue gas depth denitration purification system according to claim 1, it is characterised in that: described removes
Dirt device (22) is bag filter (22).
7. dangerous waste incineration flue gas depth denitration purification system according to claim 1, it is characterised in that: the danger
Dangerous incineration of waste flue gas depth denitration purification system further includes for providing NH to the Benitration reactor (24)3Urea water
Solve device, the steam steam air heater for being heated to air, respectively with the urea hydrolyser, the steam steam air heater and
The mixer that the Benitration reactor (24) is connected.
8. dangerous waste incineration flue gas depth denitration purification system according to claim 7, it is characterised in that: the danger
Dangerous incineration of waste flue gas depth denitration purification system further includes the pressure and temperature reducing being connected with the afterheat boiler system (09)
Device, the reducing-and-cooling plant are connected with the urea hydrolyser.
9. dangerous waste incineration flue gas depth denitration purification system according to claim 1, it is characterised in that: described is de-
The top of nitre reactor (24) has the flue being connected with the deduster (22), and the Benitration reactor (24) is cut
Face area is 2.5~10 times of the flue cross section area, is equipped with fine pith low temperature in the Benitration reactor (24)
Type SCR catalyst (31).
10. dangerous waste incineration flue gas depth denitration purification system according to claim 1, it is characterised in that: described
Dangerous waste incineration flue gas depth denitration purification system further includes that the deduster (22) and the denitration reaction is arranged in
Smoke-heating device between device (24), the Benitration reactor (24) is interior to be equipped with high temperature modification SCR catalyst (31).
11. a kind of using dangerous waste incineration flue gas depth denitration purification system pair described in any one of claims 1 to 10
The method that hazardous waste is purified, characterized by the following steps:
(1) proportion for controlling dangerous waste material, auxiliary fuel and combustion air, so that into the material in the rotary kiln (03)
Calorific value within the set range；
(2) material is burned by the rotary kiln (03), controls the temperature in the rotary kiln (03)
It is 850~1050 DEG C；
(3) flue gas that burning generates in the rotary kiln (03) described in enters the secondary combustion chamber (05) and burns, and adjusts
Fuel quantity and air capacity in the burner of the secondary combustion chamber (05) match the secondary combustion chamber (05) so that described
Outlet Gas Temperature is 900~1100 DEG C, controls the flue gas in the residence time > 2 of the secondary combustion chamber (05)
Second, the oxygen content for controlling described secondary combustion chamber (05) exit is 6~12%；
(4) flue gas in secondary combustion chamber (05) exit described in enters the afterheat boiler system (09) and cools down, and controls
The flue-gas temperature in described afterheat boiler system (09) exit of system is 280~400 DEG C；
(5) flue gas in afterheat boiler system (09) exit described in enters the flue gas quenching tower (10) progress from top to bottom
Cooling, the flue-gas temperature for controlling described flue gas quenching tower (10) exit is 180~230 DEG C, controls the flue gas in institute
Flue gas quenching tower (10) the interior residence time stated was less than 1 second；
(6) after the flue gas in flue gas quenching tower (10) exit described in is by extracting tower (21) deacidification, then by described
Deduster (22) dedusting, then from top to bottom enter the Benitration reactor (24) and remove NOx, then by the air-introduced machine
(25) it pushes flue gas to enter the activated carbon and fixed bed (26) and removes dioxin, heavy metallic oxide microparticle and part powder
Dirt；
(7) flue gas in activated carbon and fixed bed (26) exit described in by the tubular type GGH heat exchanger (27) first into
Mouth enters the tubular type GGH heat exchanger (27), is then entered by the first outlet flue of the tubular type GGH heat exchanger (27)
The smoke inlet of the desulfurizing tower (29) passes through the demister (28) and the desulfurization being arranged in the desulfurizing tower (29)
Agent carries out demisting and desulfurization process；
(8) the second smoke inlet that the flue gas of the outlet flue of the desulfurizing tower (29) described in passes through the tubular type GGH heat exchanger (27)
Into the tubular type GGH heat exchanger (27), the flue gas temperature at the second outlet flue of the tubular type GGH heat exchanger (27) is controlled
Degree is greater than 80 DEG C；
(9) flue gas at the second outlet flue of the tubular type GGH heat exchanger (27) described in is discharged by the chimney (30)；
(10) lime-ash of each section falls into the water-seal slag-scraping machine.
12. according to the method for claim 11, it is characterised in that: when the calorific value of the material is more than the setting model
When enclosing, industrial sludge or waste liquid are added into the material.
13. according to the method for claim 11, it is characterised in that: the sulfur elimination is that mass concentration is 20~30%
NaOH solution.
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