CN208703931U - Solid waste incineration flue gas processing system - Google Patents
Solid waste incineration flue gas processing system Download PDFInfo
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- CN208703931U CN208703931U CN201820443489.3U CN201820443489U CN208703931U CN 208703931 U CN208703931 U CN 208703931U CN 201820443489 U CN201820443489 U CN 201820443489U CN 208703931 U CN208703931 U CN 208703931U
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Abstract
The utility model discloses a kind of solid waste incineration flue gas processing systems, solve the problems, such as effectively to control dioxin with expectation.This system includes sequentially connected denitration process unit, dust separation unit, desulfurization unit and exhaust unit.The operating method of this system includes following operation: carrying out denitration process to solid waste incineration flue gas；400 DEG C or more progress high temperature fume dust removal purified treatments are still in the solid waste incineration flue gas after denitration process；Desulfurization is quickly cooled down to the flue gas after high temperature fume dust removal purified treatment, the flue gas is allowed to be rapidly achieved 200 DEG C or less, high temperature denitration above-mentioned in this way combines, chilling desulfurization is carried out i.e. after high temperature denitration, flue gas can not only be cooled down, while so that the chloride ion in the flue gas is entered desulfurizing agent solution and carrying out desulfurization.
Description
Technical field
The utility model relates to solid waste incineration flue gas technical fields, in particular to solid waste incineration flue gas
Cleaning treatment system.
Background technique
A large amount of solid waste incineration flue gas can be generated to the burning of solid waste at present, to avoid the secondary pollution to environment,
These solid waste incineration flue gas need to be by stringent purified treatment could discharge after sufficiently removing pollutant therein.Solid waste
Pollutant in incineration flue gas is mainly the sour gas such as dust, sulfur dioxide and dioxin.Since dioxin is endangered to human body
The great extremely toxic substance of evil, therefore, the discharge for controlling dioxin is the most important thing of solid waste incineration flue gas processing.
Currently, domestic garbage incinerating power plant is " SNCR denitration (selectivity using a kind of flue gas of refuse burning processing method
Non-catalytic reduction denitration)+semidry method/dry-process deacidification+active carbon spray de- dioxin+sack cleaner dedusting " technique, i.e., should
Technique carries out SNCR denitration first, obtains denitration flue gas, then carries out semidry method/dry-process deacidification, carries out active carbon spray again later
De- dioxin is penetrated, to adsorb dioxin, sack cleaner dedusting is finally used, dust is collected.
Utility model content
The purpose of this utility model is to provide solid waste incineration flue gas processing systems, are disliked with solving effectively control two
The problem of English discharges.
To achieve the goals above, a kind of 1. solid waste incineration flue gas processing systems are provided, including are sequentially connected
Denitration process unit, dust separation unit, desulfurization unit and exhaust unit；
Above-mentioned denitration process unit, for carrying out denitration process to solid waste incineration flue gas；
Above-mentioned dust separation unit, for being dusted purification at 400 DEG C or more into the dust separation unit flue gas
Processing；
Above-mentioned desulfurization unit makes in the flue gas for carrying out chilling desulfurization to the flue gas by above-mentioned dust separation processing
Chloride ion enters desulfurizing agent solution and the flue gas is allowed to reach 200 DEG C or less.
Further to implement, the outlet end of above-mentioned dust separation unit is provided with the dust material of connection denitration process unit
Circulation loop.
Further, above-mentioned dust material circulation loop includes pneumatic ash transmitting system；
Above-mentioned denitration process unit includes incinerator and SNCR denitration device；
Above-mentioned dust separation unit includes the hot precipitator with intermetallic compound high-temperature filter material；
Above-mentioned incinerator, SNCR denitration device, hot precipitator, pneumatic ash transmitting system are sequentially connected and form closed loop.
Further, the smoke outlet of above-mentioned hot precipitator be sequentially connected wet desulfurization system, flue gas heater,
Blower, chimney, above-mentioned wet desulfurization system, flue gas heater form above-mentioned desulfurization unit, and above-mentioned blower, chimney composition are above-mentioned
Exhaust unit.
Further, dechlorinator is provided between above-mentioned SNCR denitration device, hot precipitator, for burning to solid waste
Burning flue gas to carry out mainly removing object is that the dechlorination of hydrogen chloride is handled；Above-mentioned incinerator, SNCR denitration device, dechlorinator's composition
Above-mentioned denitration process unit, above-mentioned dust material circulation loop are set to dust outlet end and the dechlorinator of hot precipitator
Between dust inlet end.
Further, above-mentioned dechlorinator into solid waste incineration flue gas by injecting for the dechlorination with hcl reaction
The mode of agent removes hydrogen chloride.
Further, above-mentioned antichlor uses alkali metal type antichlor or alkaline-earth metal type antichlor.
Further, above-mentioned antichlor uses main component for the calcium base dechlorination of calcium carbonate, calcium hydroxide or calcium oxide
Agent.
Further, above-mentioned desulfurization unit includes sequentially connected scr reactor, waste heat boiler, takes off
Sulfur scrubber tower, reheater, above-mentioned exhaust unit include sequentially connected blower and chimney.
Further, there is above-mentioned hot precipitator the dust granules content that will be already expired in air filtration body to control in 10mg/
Nm3Filter efficiency below.
Further, the surface of the filter element of above-mentioned hot precipitator is provided with the filtering with solid waste incineration flue gas
And it is attached to the cake layer on the surface of the filter element, dust containing above-mentioned antichlor.
The purifying treatment method of this solid waste incineration flue gas processing system includes following operation: burning cigarette to solid waste
Gas carries out denitration process；It is net that 400 DEG C or more progress high temperature fume dust removals are still in the solid waste incineration flue gas after denitration process
Change processing.
If being denitration process unit by the device definition for implementing above-mentioned denitration process, implementing high temperature fume dust removal purified treatment
Equipment be dust separation unit, then establish dust material between above-mentioned denitration process unit and dust separation unit and be recycled back to
Road, so as to return to denitration process unit by the dust material that dust separation unit intercepts.
Chilling desulfurization is carried out using desulfurizing agent solution to the flue gas after high temperature fume dust removal purified treatment, is made in the flue gas
Chloride ion enters desulfurizing agent solution and the flue gas is allowed to be rapidly achieved 200 DEG C or less.Carrying out chilling desulfurization using desulfurizing agent solution can
By using spray in a manner of carry out, can also using by flue gas be passed directly in desulfurizing agent carry out chilling desulfurization, which with
Above-mentioned high temperature denitration combines, i.e., carries out chilling desulfurization after high temperature denitration, can not only cool down to flue gas, while making the cigarette
Chloride ion in gas enters desulfurizing agent solution and carries out desulfurization.
Further, if being denitration process unit by the device definition for implementing above-mentioned denitration process, implementing high-temperature flue gas
The equipment of dust separation processing is dust separation unit, then establishes powder between above-mentioned denitration process unit and dust separation unit
Dirt substance circulation loop, so as to return to denitration process unit by the dust material that dust separation unit intercepts.
Pair applicant is after the method for the current control dioxin of research, this quick and easy method of utility model, i.e.,
Dust is obtained after dust separation cell processing, denitration process unit is sent back to by dust material circulation loop and carries out pyrolysis gas again
Change.Then it carries out carrying out chilling desulfurization to flue gas using wet desulphurization, flue gas fast cooling is extremely under the action of desulfurizing agent solution
200 DEG C hereinafter, chloride ion is allowed to enter desulfurizing agent solution simultaneously, desulfurization and can prevent dioxin from generating in this way.
Further, the time used in above-mentioned chilling desulfurization is < 2s.
It is discharged further, the flue gas after desulfurization is in after 200 DEG C of > and≤11 DEG C using blower.To prevent liquid phase
There is corrosion blower, plays the role of protecting blower.
Further, it is above-mentioned to solid waste incineration flue gas carry out denitration process be flue gas be in 700~1200 DEG C it
Between carry out.
Further, above-mentioned carry out denitration process using SNCR denitration to solid waste incineration flue gas.
Further, above-mentioned high temperature fume dust removal purified treatment is used through filter element to solid solid waste incineration flue gas
In dust particles carry out physics interception hot precipitator be dusted purification；Wherein, above-mentioned hot precipitator have will
The dust granules content filtered in gas is controlled in 10mg/Nm3Filter efficiency below.
To achieve the goals above, one aspect according to the present utility model additionally provides a kind of solid waste incineration flue gas
Cleaning treatment system, including sequentially connected denitration process unit, dust separation unit, desulfurization unit and exhaust unit；It is above-mentioned
The outlet end of dust separation unit is provided with the dust material circulation loop of connection denitration process unit.
Further, above-mentioned dust material circulation loop includes pneumatic ash transmitting system；Above-mentioned denitration process unit includes
Incinerator and SNCR denitration device；Above-mentioned dust separation unit includes the high-temperature dust removal with intermetallic compound high-temperature filter material
Device；Above-mentioned incinerator, SNCR denitration device, hot precipitator, pneumatic ash transmitting system are sequentially connected and form closed loop.
Using above-mentioned closed loop, the dust weight for being collected into hot precipitator using the compressed air in pneumatic ash transmitting system
It newly sends incinerator back to and carries out high temperature incineration, a portion in dust is gasificated as flue gas, and another part is finally with burning
The clinker of furnace is discharged, to contain the generation of dioxin to greatest extent.The solid waste incineration flue gas of the utility model
The mode that processing system is different from the currently used de- dioxin of active carbon injection controls dioxin, can greatly reduce activity in this way
The effectively discharge of control dioxin simultaneously of the dosage of charcoal.
Further, the smoke outlet of above-mentioned hot precipitator be sequentially connected wet desulfurization system, flue gas heater,
Blower.
Containing the technological deficiency in dioxin generation for current technique, what the hot precipitator of the utility model used
Filtrate is intermetallic compound film, and the exit gas temperature after hot precipitator dedusting is controlled at 400 DEG C or more, is effectively held back
The generation of the dioxin in deduster is made.
The utility model is described further with reference to the accompanying drawings and detailed description.The utility model is additional
Aspect and advantage will be set forth in part in the description, and partially will become apparent from the description below.Or it is practical by this
Novel practice is recognized.
Detailed description of the invention
The attached drawing for constituting a part of the utility model is used to assist understanding to the utility model, provided in attached drawing
Content and its related explanation can be used for explaining the utility model in the present invention, but is not constituted to the utility model not
Work as restriction.In the accompanying drawings:
Fig. 1 is a kind of a kind of schematic diagram of embodiment of solid waste incineration flue gas processing system of the utility model；
Fig. 2 is a kind of signal of solid waste incineration flue gas processing system another embodiment of the utility model
Figure.
Specific embodiment
Clear, complete explanation is carried out to the utility model with reference to the accompanying drawing.Those of ordinary skill in the art are being based on
The utility model will be realized in the case where these explanations.Before being illustrated in conjunction with attached drawing to the utility model, spy is needed
It is not pointed out that:
The technical solution provided in each section including following the description and technical characteristic in the utility model,
In the case where not conflicting, these technical solutions and technical characteristic be can be combined with each other.
In addition, the embodiments of the present invention being related in following the description are generally only the reality of one branch of the utility model
Example is applied, instead of all the embodiments.Therefore, based on the embodiments of the present invention, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, the model of the utility model protection all should belong to
It encloses.
About term in the utility model and unit.The specification and claims of the utility model and related part
In term " includes " and its any deformation, it is intended that cover and non-exclusive include.Unit " mg/Nm3" mean " milligram
Every standard cubic meter ".
Fig. 1 is the schematic diagram of the solid waste incineration flue gas processing system of the utility model.As shown in Figure 1, this solid waste
Object incineration flue gas processing system includes sequentially connected denitration process unit, dust separation unit, desulfurization unit and discharge
Unit；The outlet end of above-mentioned dust separation unit is provided with the dust material circulation loop of connection denitration process unit；It is above-mentioned to remove
Dirt clean unit includes the hot precipitator 3 with intermetallic compound high-temperature filter material.Intermetallic compound high-temperature filter material passes through
The utility model of applicant, which is created, has very high filter efficiency, that is, has the dust granules content control that will be already expired in air filtration body
System is in 10mg/Nm3 filter efficiency below, and before the utility model, applicant has been obtained for changing between the metal filtrate
Close the related patents of object high-temperature filter material.
Above-mentioned dust material circulation loop includes pneumatic ash transmitting system；Above-mentioned denitration process unit includes 1 He of incinerator
SNCR denitration device 2；Above-mentioned incinerator 1, SNCR denitration device 2, hot precipitator 3, pneumatic ash transmitting system 4 are sequentially connected and shape
At closed loop.The smoke outlet of above-mentioned hot precipitator 3 is sequentially connected wet desulfurization system 5, flue gas heater 6, blower 7.
Process is that flue gas in incinerator 1 after being discharged, and into SNCR denitration device 2, the flue gas after denitration process is again
It is handled into hot precipitator 3, the dust that at this moment hot precipitator 3 intercepts passes through compressed air by pneumatic ash transmitting system 4
It sends incinerator 1 back to, passes through gas (including being sent back to the gas generated after the dust gasification of incinerator 1) warp of hot precipitator 3
It crosses wet desulfurization system 5 to wash under desulfurizing agent solution, is heated by flue gas heater 6 then pass through chimney 8 through blower 7 later
Discharge.
Above-mentioned incinerator 1 of sending back to is carried out again in the dust of pyrolytic gasification, cannot vaporized part dust finally can be with
1 clinker of incinerator is discharged at incinerator 1.
Above-mentioned incinerator 1, above-mentioned incinerator 1, SNCR denitration device 2, pneumatic ash transmitting system 4 are all using generally conventional
Exemplary apparatus.Here conventional exemplary apparatus is also not limited to a kind of single equipment, as incinerator 1 can be using stream
Change the existing solid waste burning facilities such as bed incinerator 1, module type incinerator 1 or on existing solid waste burning facility basis
Upper improved solid waste burning facility.
SNCR denitration device 2 is the denitrification apparatus using selective non-catalytic reduction method, selective non-catalytic reduction
Method is a kind of without using catalyst, and the method for NOx is restored in 850~1100 DEG C of temperature ranges.Most-often used drug is ammonia
And urea.SNCR denitration device 2 is also denitrification apparatus conventional at present.
It comprises the concrete steps that:
Step 1, from incinerator 1, (incinerator 1 here configures dual firing chamber, it can receives the combustion for the dust that recycling comes
Room) come out flue gas control at 750~1200 DEG C.
Step 2, flue gas carries out SNCR denitration at this temperature.SNCR does not have the denitration catalyst of valuableness used in SCR technology
Agent, technical advantage are that investment is few with operating cost, SO2/SO3Conversion ratio is small.
Step 3, the flue gas after denitration carry out high-temperature dust removal at 400 DEG C or more.The dust that hot precipitator 3 is collected passes through
Air dust transporting system is sent back to incinerator 1 and is carried out pyrolytic gasification again using compressed air, cannot vaporized dust finally with
1 clinker of incinerator is discharged at incinerator 1.
The filtrate used when hot precipitator dedusting at present for ceramic fibre, cause when dedusting flue-gas temperature be still in 11~
In 400 DEG C of dioxin formation range temperature, the filtrate that the hot precipitator 3 of the utility model uses is intermetallic compound film,
Exit gas temperature after 3 dedusting of hot precipitator is controlled at 400 DEG C or more, has effectively contained the dioxin in deduster
Generation.
Step 4: wet desulphurization is carried out, flue gas fast cooling is to 200 DEG C hereinafter, simultaneously under the action of desulfurizing agent solution
It allows chloride ion to enter desulfurizing agent solution, desulfurization and can prevent dioxin from generating.
Step 5: by flue gas to 200 DEG C and≤11 DEG C of >, prevent liquid phase from corrosion blower 7 occur.
Step 6: atmosphere is discharged by chimney 8 by blower 7.
Dioxin is the abbreviation of dioxin compounds, and there are mainly two types of the possible approaches of the generation of dioxin: first is that two
English is disliked just to be already present in solid waste before solid waste is burned；Second is that being synthesized by predecessor, i.e. dioxin predecessor is by urging
Change metal function occurs complicated condensation reaction and generates dioxin, and mainly there are two sources for predecessor: contained by solid waste itself
The activating substance of dioxin predecessor and the organic precursors being present in gas phase and ash surface that are generated by imperfect combustion
Reaction generates；Besides de novo formation, i.e., can generate a certain amount of flying dust in high-temp combustion, on flying dust containing macromolecular carbon,
Unburnt carbon original grain and catalytic specie (mainly filtering state metal), these substances can be with the hydrogen chloride in flue gas 11
It reacts at~400 DEG C, generates dioxin (when because burning insufficient in flue gas by gasification, chlorination and condensation reaction
Excessive not entirely so substance is generated, and meets suitable touching coal substance such as heavy metal, especially copper etc. and 400 DEG C of temperature environment,
The dioxin so decomposed in high-temp combustion will regenerate).So passing through the high-temperature dust removal in present embodiment
Device 3 can allow during collecting dust, be maintained at 400 DEG C or more of temperature, effectively prevent dioxin filtered in this way
Generation in journey.
In SNCR denitration, reaction temperature has a major impact the removal efficiency of NOx in SNCR reaction.If temperature is too low,
It is incomplete that this will lead to NH3, is formed so-called " ammonia penetrates ", and the amount for increasing NH3 evolution forms secondary pollution；With temperature liter
Height, molecular motion accelerate, evaporation and the diffusion process of ammonium hydroxide are strengthened, for SNCR, when temperature rise to 800 DEG C with
When upper, chemical reaction rate is obviously accelerated, and at 900 DEG C or so, the cut rate of NO reaches maximum；However as the continuation of temperature
It increases, after 1200 DEG C, the oxidation reaction of NH3 and O2 can aggravate, and generate N2, N2O or NO, and the NOx increased in flue gas is dense
Degree, denitrification rate decline instead.It is more closed so controlling the flue gas come out from incinerator 1 in step 1 at 800~850 DEG C
It is suitable.
Reducing agent mixes with flue gas the process and speed that degree determines reaction, and reducing agent and flue gas are in dore furnace
It is reacted in mixing, mixed effect directly determines the height of out of stock efficiency.One of the main reason for SNCR denitration low efficiency
It is exactly mixed problem, for example, the NOx concentration of part is excessively high, agent reduction cannot be reduced, cause denitration efficiency low；The NOx of part
Concentration is too low, and reduction reaction does not occur all for reducing agent, causes reducing agent utilization rate low also, increases the escaping of ammonia.Therefore, reducing agent
Mix with flue gas degree it is abundant whether, directly affect denitration achievement.The penetrating mode of reducing agent is by existing in present embodiment
Some general technology reasonable Arrangement Burners Positions adjust reducing agent straying quatity and atomizing effect at different location to improve mixing
Cheng Du improves denitration efficiency.Meanwhile the performance of denitration, flue gas can be improved in the ratio of momentum of high momentum of impinging jet and flue gas stream
The turbulent extent of air-flow is to being mixed with facilitation.
The use of reducing agent in SNCR denitration, it is various containing amino, and the object of NH3 is decomposed to give off when heating
Matter all can serve as the reducing agent of SNCR reaction, and the reducing agent of most common of them is ammonia and urea, uses these two types of reducing agents
When, the removal efficiency for the NOx that reduction mechanism difference obtains is slightly different.Scholar both domestic and external has studied ammonia, urea, bicarbonate
The denitrification process of a variety of different reducing agents such as ammonium, cyanuric acid isocyanic acid, discovery reducing agent different oxygen content and at a temperature of and also
Former characteristic is different, and the suitable reactions temperature of ammonia is minimum, the suitable reactions temperature highest of isocyanic acid, ammonia, urea, cyanuric acid three
Kind reducing agent exists respectively: 1%, denitration effect is best under 5% and 12% oxygen content.Various nitrogen reductants at different conditions
Optimum temperature window is different, and ammonia is at 850-1050 DEG C under normal circumstances, and urea is at 900-1100 DEG C.Because any reaction all needs
The time is wanted, so must assure that reducing agent there are enough residence times in flue gas, within the scope of suitable temperature to occur
Reduction reaction.Under the same conditions, the longer reducing agent residence time, denitration effect is more preferable, within this time, NH3 or urea etc.
Reducing agent mixes with flue gas, the evaporation of water, the decomposition of reducing agent and the reduction of NOx and etc. must be fully completed, it is general to require
Time is 0.5s.And the ammonia of spray pattern depends on the size of dore furnace in the residence time length of dore furnace, flue gas flows through point
The factors such as the form that the speed of solution furnace, solution atomization situation, mist field are mixed with flue gas.So ensuring that reducing agent stops in an implementation
Time reaches 0.5s or more, it is ensured that higher denitration efficiency.
There are also another embodiments other than present embodiment:
Dechlorinator 9 is provided between SNCR denitration device 2, hot precipitator 3, dechlorinator 9, burns SNCR denitration device 2
It burns furnace 1 and forms above-mentioned denitration process unit, it is anti-that the smoke outlet of hot precipitator 3 is disposed with selective catalytic reduction
Answer device 10, waste heat boiler 11, desulfurization washing tower 12, reheater 13, blower 7 and chimney 8.Incinerator 1 smoke outlet also
Waste heat boiler can be set (waste heat boiler connecting with incinerator 1 is not shown in the figure).
Wherein, above-mentioned dechlorinator 9 is (i.e. de- as the dechlorination processing unit in the solid waste incineration flue gas processing system
Nitre processing unit includes dechlorination processing unit), it is hydrogen chloride for carrying out main removing object to solid waste incineration flue gas
Dechlorination processing；Above-mentioned hot precipitator 3 is net as the high temperature fume dust removal in the solid waste incineration flue gas processing system
Change processing unit, for treated that solid waste incineration flue gas is dusted purified treatment to dechlorination.
Waste heat pot in addition to above-mentioned dechlorinator 9 and hot precipitator 3, in the solid waste incineration flue gas processing system
Furnace, desulfurization washing tower 12, reheater 13, blower 7 and chimney 8 are also that typical solid waste described in background technique is burned
The equipment equally existed in gas cleaning system.Wherein, reheater 13 is configured after desulfurization washing tower 12 is wet process of FGD
The conventional techniques of technique are no longer specifically described it in this specification.
Below with reference to above-mentioned solid waste incineration flue gas processing system, to applying at the solid waste incineration flue gas
The solid waste incineration flue gas processing method of reason system is illustrated.This method has specifically included following steps:
Step 1: the high temperature solid waste incineration flue gas that incinerator 1 is discharged imports waste heat boiler and carries out UTILIZATION OF VESIDUAL HEAT IN, waste heat
The temperature of the solid waste incineration flue gas of boiler discharge is 400 DEG C or more；
Step 2: the solid waste incineration flue gas of the above-mentioned temperature of waste heat boiler discharge is subjected to SNCR denitration, later dechlorination
Tower 9 carries out mainly removing the dechlorination processing that object is hydrogen chloride；The dechlorination that dechlorinator 9 is discharged treated solid waste is burned
Flue gas imports hot precipitator 3 and is dusted purified treatment；
After above-mentioned steps two, the temperature of solid waste incineration flue gas is still in 400 DEG C or more, that is, step 2 occurs
The temperature of solid waste incineration flue gas is still in during 400 DEG C or more；
Step 4: the solid waste incineration flue gas that hot precipitator 3 is discharged imports scr reactor 10, from
And selective-catalytic-reduction denitrified technique is used to carry out the processing of dioxin oxygenolysis to solid waste incineration flue gas；
Step 5: the solid waste incineration flue gas that scr reactor 10 is discharged is imported into waste heat boiler 11 and is carried out
Further UTILIZATION OF VESIDUAL HEAT IN, sufficiently to recycle the heat of solid waste incineration flue gas；
Step 6: the solid waste incineration flue gas that waste heat boiler 11 is discharged imports desulfurization washing tower 12 and carries out desulfurization process,
Then it after the solid waste incineration flue gas after desulfurization process being passed sequentially through reheater 13, blower 7 again, is discharged through chimney 8.
On the one hand above-mentioned solid waste incineration flue gas processing method is still in 400 in the temperature of solid waste incineration flue gas
DEG C or more when high temperature fume dust removal purified treatment just is carried out to it, due to being not easy in solid waste under 400 DEG C or more of the condition of high temperature
Catalysis forms dioxin on the dust particles of object incineration flue gas, at this point, disliking synthesis two by high temperature fume dust removal purified treatment
The hydrogen chloride and dust particles gas solid separation of English, being equivalent to makes hydrogen chloride and dust particles have not been entered into synthesis dioxin
It is just separated when preference temperature section, has thoroughly cut off these and combined in turn between isolated hydrogen chloride and dust particles
Synthesize dioxin chance；Pair on the other hand, this method has also carried out dechlorination processing before high temperature fume dust removal purified treatment, i.e.,
Hydrogen chloride for synthesizing dioxin is removed, in this way, just reducing the solid waste after high temperature fume dust removal purified treatment
Probability of the remaining dust particles in conjunction with hydrogen chloride in incineration flue gas effectively compensates for high temperature fume dust removal purified treatment gas-solid
Separative efficiency is difficult to reach 100% loophole.
In addition, in above-mentioned solid waste incineration flue gas processing method, due to applying selective catalytic reduction reaction
Device 10, therefore the nitrogen oxides in solid waste incineration flue gas can either be removed by selective-catalytic-reduction denitrified technique, meanwhile,
Selective-catalytic-reduction denitrified technique can also promote dioxin oxygenolysis, make dioxin oxygenolysis carbon dioxide, water
And hydrogen chloride, to be further reduced the discharge of dioxin.
" selective-catalytic-reduction denitrified technique " is the prior art, generally uses the oxide of titanium, vanadium, tungsten as catalysis
Agent, such as V2O5-WO3Catalyst.Typically, selective-catalytic-reduction denitrified technique is used to remove the nitrogen oxides in flue gas；
In addition, the catalytic-reduction denitrified technique of selecting property can be such that the effect of dioxin oxygenolysis is also known.For selective catalysis
Reduction denitrating technique needs the measure for first injecting the reducing agents such as ammonia into solid waste incineration flue gas no longer to illustrate.
Selective-catalytic-reduction denitrified technique is applied in above-mentioned solid waste incineration flue gas processing method, there are two special
Different advantage: first is that the solid waste incineration flue gas temperature after high temperature fume dust removal purified treatment is higher, there is no need to by adding again
Heat treatment can enter scr reactor 10 and (and typically, in order to adapt to the operating temperature of catalyst, need
Flue gas is reheated), therefore save energy consumption；It is removed second is that solid waste incineration flue gas has passed through high-temperature flue gas in advance
Dirt purified treatment, dust content has obtained effective control, therefore catalyst poisoning can be effectively prevented.
Dechlorination processing in above-mentioned solid waste incineration flue gas processing method, can be realized using various ways.But
It is general to be used for and chlorination using by being injected into solid waste incineration flue gas in order to keep the temperature of solid waste incineration flue gas as far as possible
The mode of the antichlor of hydrogen reaction removes hydrogen chloride.
The selection of antichlor is more, and generally can choose main component is potassium hydroxide, potassium carbonate, saleratus, hydrogen-oxygen
Change the alkali metal type antichlor of sodium, sodium carbonate, any one or a few substance in sodium bicarbonate, or selects main component for hydrogen
Calcium oxide, calcium oxide, calcium carbonate, magnesium hydroxide, any one or a few substance in magnesia alkaline-earth metal type antichlor.
Wherein, and to select main component as any one or a few substance in calcium carbonate, calcium hydroxide and calcium oxide
Calcium based dechlorinating agent is advisable.It may insure there is higher removal efficiency to hydrogen chloride in this way.
Dechlorinator 9 used by above-mentioned solid waste incineration flue gas processing method is a tower-like consersion unit, is used
In flue gas, (this equipment belongs to the common of chemical field and sets with the hybrid reaction for the absorbent of Cucumber in the flue gas
It is standby).Therefore, which can inject above-mentioned antichlor in the solid waste incineration flue gas for being passed through the dechlorinator 9, and make to take off
Chlorine agent is sufficiently mixed in solid waste incineration flue gas.
Certainly, above-mentioned dechlorinator 9 is only an embodiment for realizing above-mentioned dechlorination processing.There are also its other party
Formula is of course also possible that as directly sprayed into antichlor into the pipeline of transmission solid waste incineration flue gas.
In addition, the hot precipitator 3 in above-mentioned solid waste incineration flue gas processing system is to implement the utility model ten
Divide crucial equipment, it is desirable that reach efficiency of dust collection as high as possible, and can continually and steadily work.For this purpose, above-mentioned high-temperature dust removal
Device 3 carries out physics interception to the dust particles in solid waste incineration flue gas to realize that dedusting is net especially by filter element therein
Change, and there is the dust granules content that will be already expired in air filtration body to control in 10mg/Nm3Filter efficiency below.
In order to adapt to applied at elevated temperature environment and reach above-mentioned filter efficiency, it is however generally that, it can choose and filtered with metal
The hot precipitator of core or ceramic element as filter element.
And ensuring the regenerability of filter element in hot precipitator 3 (enables filter element by certain technological means
The ability of enough Reusabilities, current main technological means are reverse gas cleaning) it is then to guarantee that hot precipitator 3 continually and steadily works
Key.It is one of the problem of most fearness encounters in hot precipitator operational process that moisture condensation, which occurs, for filter element surface, once occur
Moisture condensation will lead to filter element surface and form thick tamper, and then reverse gas cleaning is caused to fail.
However, the utility model it has been found that due to introduced when dechlorination is handled antichlor (herein be specially calcium
Based dechlorinating agent), typically, can also be carried secretly in dechlorination treated solid waste incineration flue gas the dust of a part of antichlor and this
The dust of a little antichlors also will gradually be attached to the surface of filter element with the filtering of solid waste incineration flue gas, in this way, in mistake
The surface of filter component, which is formed by cake layer, also just contains a certain amount of calcium carbonate and/or calcium hydroxide and/or calcium oxide,
And these substances will play the role of similar " desiccant ", can avoid the surface sweating of filter element to a certain extent, separately
Outside, these substances can also prevent the influence that filter element surface acid condenses to filter element in hot precipitator 3.
Since the water imbibition of calcium oxide is stronger, and it can effectively prevent filter element surface acid in hot precipitator 3 and condense
Influence to filter element, therefore, the preferred main component of calcium based dechlorinating agent that the utility model uses are that the calcium base of calcium oxide is de-
Chlorine agent.
In order to more fully be utilized to the antichlor for entering hot precipitator 3, above-mentioned solid waste incineration flue gas
In processing system, dust material circulation loop is also set up between dechlorinator 9 and hot precipitator 3, so that by high-temperature dust removal
The dust material that device 3 intercepts returns to dechlorinator 9 as the component of antichlor.
Specifically, as shown in Fig. 2, the ash discharging hole of 3 bottom of hot precipitator is connect by return line with dechlorinator 9,
Gradually collected in 3 operational process of hot precipitator 3 bottom of hot precipitator dust material (including by reverse gas cleaning from
The dust material that the filter element surface of hot precipitator 3 is detached from) it is returned again by the return line as the component of antichlor
Return dechlorinator 9.
Certainly, the facilities such as valve needed for the connection between above-mentioned all parts is additionally provided with control, this is for this field
Technical staff is it will be apparent that being no longer described in detail herein.
The related content of the utility model is illustrated above.Those of ordinary skill in the art are being based on these explanations
In the case where will realize the utility model.Above content based on the utility model, those of ordinary skill in the art are not having
Every other embodiment obtained under the premise of creative work is made, the model of the utility model protection all should belong to
It encloses.
Claims (8)
1. solid waste incineration flue gas processing system, it is characterised in that: net including sequentially connected denitration process unit, dedusting
Change unit, desulfurization unit and exhaust unit；
The denitration process unit, for carrying out denitration process to solid waste incineration flue gas；
The dust separation unit, for being dusted purified treatment at 400 DEG C or more into the dust separation unit flue gas；
The desulfurization unit, for by the dust separation processing flue gas carry out chilling desulfurization make the chlorine in the flue gas from
Son enters desulfurizing agent solution and the flue gas is allowed to reach 200 DEG C or less.
2. solid waste incineration flue gas processing system as described in claim 1, it is characterised in that: the dust separation unit
Outlet end be provided with connection denitration process unit dust material circulation loop.
3. solid waste incineration flue gas processing system as claimed in claim 2, it is characterised in that:
The dust material circulation loop includes pneumatic ash transmitting system (4)；
The denitration process unit includes incinerator (1) and SNCR denitration device (2)；
The dust separation unit includes the hot precipitator (3) with intermetallic compound high-temperature filter material；
The incinerator (1), SNCR denitration device (2), hot precipitator (3), pneumatic ash transmitting system (4) are sequentially connected and are formed
Closed loop.
4. solid waste incineration flue gas processing system as claimed in claim 3, it is characterised in that: the hot precipitator
(3) smoke outlet is sequentially connected wet desulfurization system (5), flue gas heater (6), blower (7), chimney (8), the wet process
Desulphurization system (5), flue gas heater (6) the composition desulfurization unit, the discharge of the blower (7), chimney (8) composition
Unit.
5. solid waste incineration flue gas processing system as claimed in claim 3, it is characterised in that: the SNCR denitration device
(2), dechlorinator (9) are provided between hot precipitator (3), are for carrying out main removing object to solid waste incineration flue gas
The dechlorination of hydrogen chloride is handled；The incinerator (1), SNCR denitration device (2), dechlorinator (9) composition the denitration process list
Member, the dust material circulation loop are set to the dust outlet end of hot precipitator (3) and the dust inlet end of dechlorinator (9)
Between.
6. solid waste incineration flue gas processing system as claimed in claim 5, it is characterised in that: the dechlorinator (9) is logical
It crosses to inject into solid waste incineration flue gas and removes hydrogen chloride for the mode of the antichlor with hcl reaction.
7. solid waste incineration flue gas processing system as described in claim 1, it is characterised in that: the desulfurization unit includes
Sequentially connected scr reactor (10), waste heat boiler (11), desulfurization washing tower (12), reheater (13), institute
Stating exhaust unit includes sequentially connected blower (7) and chimney (8).
8. the solid waste incineration flue gas processing system as described in any one of claim 3 to 5 claim, feature
Be: the surface of the filter element of the hot precipitator is provided with the filtering of solid waste incineration flue gas and is attached to the filtering
The surface of component, dust containing antichlor cake layer.
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| CN201820443489.3U CN208703931U (en) | 2018-03-30 | 2018-03-30 | Solid waste incineration flue gas processing system |
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| CN201820443489.3U CN208703931U (en) | 2018-03-30 | 2018-03-30 | Solid waste incineration flue gas processing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108458351A (en) * | 2018-03-30 | 2018-08-28 | 成都易态科技有限公司 | Solid waste incineration flue gas processing method and its system |
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2018
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108458351A (en) * | 2018-03-30 | 2018-08-28 | 成都易态科技有限公司 | Solid waste incineration flue gas processing method and its system |
| CN108458351B (en) * | 2018-03-30 | 2024-01-05 | 成都易态科技有限公司 | Solid waste incineration flue gas purification treatment method and system thereof |
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