CN109371231A - Grate-rotary kiln pelletizing process pre-desulfurization denitration method - Google Patents
Grate-rotary kiln pelletizing process pre-desulfurization denitration method Download PDFInfo
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- CN109371231A CN109371231A CN201811567545.5A CN201811567545A CN109371231A CN 109371231 A CN109371231 A CN 109371231A CN 201811567545 A CN201811567545 A CN 201811567545A CN 109371231 A CN109371231 A CN 109371231A
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- urea
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- intercalation compound
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/216—Sintering; Agglomerating in rotary furnaces
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
Abstract
The invention discloses grate-rotary kiln pelletizing process pre-desulfurization denitration methods, belong to field of steel metallurgy.The present invention is dry using exhausting by I sections of drying of drying grate, and using III sections of cooling of gaseous mixture of I sections of preheating and ring cold machine, dry II sections of exhausting still dry using exhausting in hot wind source；Ca is added in green-ball preparation process2+Urea intercalation compound bentonite is chelated, urea blowing device is set in the preheating II section of drying grate and sprays into urea powder, significantly reduces NOx and SOx content in flue gas.The present invention is directed to the universal situation insufficient, that denitrating flue gas is temporarily not carried out of grate-kiln pelletizing flue gas desulphurization system ability under new environmental protection standard, by adding Ca in green-ball preparation process2+Urea intercalation compound bentonite is chelated, cooperation preheats two sections of penetrating urea powders in drying grate, by controlling Ca2+The additive amount and urea powder straying quatity for chelating urea intercalation compound bentonite, more can flexibly control the effect of desulfurization and denitration.
Description
Technical field
The present invention relates to technical field of ferrous metallurgy, take off in advance more specifically to grate-rotary kiln pelletizing process
The method of sulphur denitration.
Background technique
Pellet is that blast furnace process often uses one of iron-containing charge, and acidic pellet ore is current China with addition of high basicity sinter
The mainstream burden structure of key enterprise's blast furnace.Grate kiln method is the main stream approach of China's oxide pellet production, in height
There is critical role in furnace furnace charge preparation section.
SO2It is one of main atmosphere pollution, can aoxidizes generate sulfuric acid mist or sulfate aerosol in an atmosphere, be ring
The important predecessor of border acidification.Atmospheric sulfur dioxide has potential impact to human body in 0.5ppm or more；In 1~3ppm
When majority start to feel to stimulate；In 400~500ppm, people will appear ulcer and pulmonary edema until death by suffocation.Sulfur dioxide
There is synergistic effect with the flue dust in atmosphere.When atmospheric sulfur dioxide is 0.21ppm, dust concentration is greater than 0.3mg/L, can
Increase respiratory disease disease incidence, the state of an illness of chronic deteriorates rapidly.Therefore, both at home and abroad to SO in industrial tail gas2's
Concentration of emission has carried out stringent regulation, it is necessary to which control is in 200mg/m3Below.
NO based on nitric oxide and nitrogen dioxidexIt is the major reason to form photochemical fog and acid rain.Vapour
Nitrogen oxides and hydrocarbon in tail gas irradiate the react toxic smog to be formed, referred to as photochemistry cigarette through ultraviolet light
Mist.Photochemical fog has special odor, stimulates eyes, injures plant, and atmospheric visibility can be made to reduce.In addition, nitrogen oxidation
Object reacts the nitric acid generated with the water in air and nitrous acid is the ingredient of acid rain.Nitrogen oxides in atmosphere is mostly derived from fossil
The conversion of nitrogenous compound in the burning of fuel and the burning of plant and agricultural land soil and animal excrements.Meanwhile nitrogen oxygen
Compound can stimulate lung, make one the more difficult respiratory disease for resisting flu etc, the problematic personage of respiratory system such as asthma
Patient can influence compared with vulnerable to nitrogen dioxide.For children, it is impaired that nitrogen oxides is likely to result in lung's development.It burns at present
The concentration of emission limit value of balling group industry NOx is 300mg/m3。
With the increasingly raising of environmental protection standard, agglomerates of sintered pellets standard limit of smog release is dressed to power industry, to be done step-by-step
Minimum discharge, at that time SO2Concentration of emission requires to be lower than 35mg/m3, NOxConcentration of emission requires to be lower than 50mg/m3, enterprise's ring will be given
Work belt is protected greatly to challenge.From the point of view of the desulphurization system of domestic pelletizing plant, since design desulphurizing ability is insufficient, currently transport
The desulphurizing ability of capable desulphurization system and minimum discharge require still have certain gap, therefore part SO is removed in production process2, subtract
The burden of little end desulphurization system becomes particularly important；The domestic current NO of pelletizing plantxConcentration of emission usually again 60-280mg/m3,
Have no the report of pelletizing flue gas end denitration, but with the raising of environmental protection standard, the denitration of pelletizing production process must also put on day
Journey.For pelletizing flue gas NOxThe relatively low feature of concentration, is expected in certain phase by way of process control or emission reduction
Realize pelletizing flue gas NOxQualified discharge, compared to huge, the high enterprise of operating cost the end-of-pipe control technology of investment, the phase of process denitration
Closing work has very big realistic meaning.Main stream approach of the grate kiln method as domestic oxide pellet production, such as
What effectively realizes that its process denitration mode is even more imperative, significant.
Through retrieving, the denitration technology about grate kiln system has patent disclosure, such as Chinese Patent Application No.:
2018104409059, invention and created name are as follows: a kind of grate kiln denitrating system and method for denitration, the chain of this application
Comb machine rotary kiln denitrating system includes sequentially connected drying grate, rotary kiln and ring cold machine, and drying grate includes sequentially connected drum
Wind dryer section, down-draft drying zone, the first preheating section and the second preheating section, denitrating system further include Benitration reactor, the second preheating
Section has an exhanst gas outlet, and down-draft drying zone has a smoke inlet, Benitration reactor be connected to the exhanst gas outlet of the second preheating section with
Between the smoke inlet of down-draft drying zone, reducing agent spray is also connected between Benitration reactor and the exhanst gas outlet of the second preheating section
Injection device.Grate kiln method of denitration are as follows: lead to the flue gas in the second preheating section outside drying grate, then using reduction
Agent injection apparatus sprays into reducing agent to flue gas, then carries out denitration process to flue gas using Benitration reactor, later will be after denitration
Flue gas send to down-draft drying zone.This application is not necessarily to carry out heat temperature raising to flue gas, can be energy saving, improves denitration efficiency,
But it is not related to desulfurizing function, still there is the space advanced optimized.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to universal for grate-kiln pelletizing flue gas desulphurization system ability under new environmental protection standard
Situation insufficient, that denitrating flue gas is temporarily not carried out, provides grate-rotary kiln pelletizing process pre-desulfurization denitration method, leads to
It crosses and adds Ca in green-ball preparation process2+Urea intercalation compound bentonite is chelated, cooperation preheats two sections of penetrating urea powders in drying grate,
By controlling Ca2+The additive amount and urea powder straying quatity for chelating urea intercalation compound bentonite, more can flexibly control desulfurization
With the effect of denitration.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
Grate of the invention-rotary kiln pelletizing process pre-desulfurization denitration method, by the dryer section front end of drying grate
I sections of drying it is dry using exhausting, hot wind source using I section of preheating and ring cold machine III sections of cooling of gaseous mixture, after dryer section
Dry II sections of the exhausting at end still dry using exhausting；Ca is added in green-ball preparation process2+Urea intercalation compound bentonite is chelated, in chain
Urea blowing device is set in the preheating II section of comb machine and sprays into urea powder, significantly reduces NOx and SOx content in flue gas.
Further, Ca2+Chelate urea intercalation compound bentonite includes following components by mass percentage: 2.5-
The Ca (OH) of the urea of 10wt.%, 2.5-10wt.%2With the bentonite of 80-95wt.%.
Further, Ca2+Chelate urea intercalation compound bentonite be it is powdered, be less than 0.074mm grain size content >=
95wt.%.
Further, 1.0-4.0wt.%Ca is added in green-ball preparation process2+Chelate urea intercalation compound bentonite.
Further, Ca2+Chelating urea intercalation compound bentonite is prepared according to the following steps:
P1, add water to digest quick lime, be made into Ca (OH)2Saturated solution is inwardly added and Ca (OH)2Etc. quality urea,
It stirs；
P2, by mixed solution heating stirring, so that mixed solution is evaporated to reactant in molten state；
P3, bentonite and with addition of moisture is added into above-mentioned fusant, stirs evenly；
P4, it said mixture is placed at room temperature carries out microwave heating treatment after a period of time and makes its agglomeration, it then will knot
Block material be finely ground to it is powdered to obtain the final product.
Further, in step P2 by mixed solution under the conditions of 100-120 DEG C, constant temperature stirring, heating 0.5-3h.
Further, it is Ca (OH) that bentonitic quality is added in step P32With 4-19 times of urea quality sum, and match
The moisture for adding mass percent 5-8wt.%, then stirs evenly.
Further, mixture is placed into 10-14h in step P4 at room temperature, is subsequently placed in microwave oven, temperature
Degree control is 80-100 DEG C, heats 0.5-2h, then caking materials are finely ground to less than 0.074mm grain size content >=95wt.%.
Further, desulphurization denitration can control respectively, specific as follows:
When 1.0-4.0wt.%Ca is added in green-ball preparation process2+Chelating urea intercalation compound bentonite, II sections of preheating do not spray into
When urea powder, this method only realizes flue gas pre-desulfurization；
When preheating NO mole in II sections of penetrating urea powder mole≤1/2 times flue gases, it is not added in green-ball preparation process
Enter Ca2+When chelating urea intercalation compound bentonite, this method only realizes the preparatory denitration of flue gas；
When preheating NO mole in II sections of penetrating urea powder mole 1/2 times of flue gas of >, add in green-ball preparation process
Enter 1.0-4.0wt.%Ca2+Urea intercalation compound bentonite is chelated, this method realizes flue gas pre-desulfurization denitration simultaneously, and strengthens preparatory
Desulfurization effect.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, there is following remarkable result:
(1) grate of the invention-rotary kiln pelletizing process pre-desulfurization denitration method, by green-ball preparation process
Middle addition Ca2+Urea intercalation compound bentonite is chelated, the SO generated during rotary kiln pelletizing preheating and baking is made2It is being recycled to drying grate
It when dryer section, reacts, solidify into dedusting ash with the ammonia of sustained release, significantly reduce the SO in exhaust gas2Content；Secondly, urine used
Plain dry powder can preheat II sections of realization SNCR denitrations, excessive NH3Desulfidation can be played in subsequent dryer section, no the escaping of ammonia is asked
Topic, to realize process pre-desulfurization denitration.
(2) grate of the invention-rotary kiln pelletizing process pre-desulfurization denitration method, Ca2+It is swollen to chelate urea intercalation
On the one hand granularity requirements -0.074mm grain size content >=95% for moistening soil is conducive to be scattered in pelletizing to give full play to bond and make
With；Meanwhile it can make to be reduced to minimum to the adverse effect of pellet strength after wherein can decompose substance pyrolytic.
(3) grate of the invention-rotary kiln pelletizing process pre-desulfurization denitration method, Ca2+It is swollen to chelate urea intercalation
Profit soil is 20-50 DEG C high compared with common urea decomposition temperature, and thermal stability is strong, slows down NH3Release extends regional area NH3With SO2、
H2In the reaction time of O, react fully progress, achievees the purpose that improve desulfuration efficiency.
(4) it is full to preheat II sections of temperature ranges for grate of the invention-rotary kiln pelletizing process pre-desulfurization denitration method
The temperature requirement of sufficient selective non-catalytic reduction, blowing urea powder can utmostly reduce spray confrontation in-furnace temperature not
Benefit influences, and reduces the influence to original process.
(5) grate of the invention-rotary kiln pelletizing process pre-desulfurization denitration method prepares Ca2+Urea is chelated to insert
Microwave heating is used when layer bentonite, to Ca2+Chelating urea intercalation carry out there is significant facilitation, gained is compound
The urea of structure has higher decomposition temperature, and the rate that ammonia is released in certain temperature range will also slow down, to reach
To the purpose for improving desulfuration efficiency.
Detailed description of the invention
Fig. 1 is the schematic illustration of grate of the invention-rotary kiln pelletizing process pre-desulfurization denitration method.
Label declaration in schematic diagram:
100, drying grate；110, I sections dry；120, II sections dry；130, I sections are preheated；140, II sections are preheated；150, dry
Section；160, preheating section；200, rotary kiln；210, furnace zone；220, soaking zone；300, ring cold machine；310, I sections cooling；320, cold
But II sections；330, III sections cooling；340, IV sections cooling.
Specific embodiment
To further appreciate that the contents of the present invention, in conjunction with attached drawing, the present invention is described in detail.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
The present invention will be further described with reference to the examples below.
Embodiment 1
As shown in Figure 1, the grate of the present embodiment-rotary kiln pelletizing process pre-desulfurization denitration method, by drying grate
The drying I section 110 of 100 150 front end of dryer section is dry using exhausting, and hot wind source is using preheating I section 130 and ring cold machine 300
Cooling III section 330 gaseous mixture, the drying II section 120 of 150 rear end of dryer section is still dry using exhausting；And it is prepared in green-ball
Ca is added in the process2+Chelate urea intercalation compound bentonite, in the preheating II section 140 of drying grate 100 be arranged urea be milled, store,
Screw feeder and dry powder blowing device, blowing device spray into urea powder to preheating II section 140, make NOx and SOx content in flue gas
It significantly reduces.
Grate-rotary kiln pelletizing production system includes the drying grate 100 being sequentially connected, rotary kiln 200 in the present embodiment
With ring cold machine 300, wherein drying grate 100 includes the dryer section 150 of front end and the preheating section 160 of rear end, and dryer section 150 includes dry
Dry I section 110 and dry II section 120, preheating section 160 include preheating I section 130 and preheating II section 140, and rotary kiln 200 then includes roasting
Burning section 210 and soaking zone 220, ring cold machine 300 include IV sections of cooling I section 310, cooling II section 320, cooling III section 330 and cooling
340, this grate-rotary kiln pelletizing production system structure is no longer to add to repeat herein known in industry.
Dry I section 110 is adjusted to take out by the method for the process pre-desulfurization denitration of the present embodiment by traditional forced air drying
It air-dries dry, and using the gaseous mixture of preheating I section 130 and cooling III section 330 as hot wind source, while adding when prepared by green-ball
Enter the special Ca of 1.0-4.0wt.%2+The conventional bentonite of urea intercalation compound bentonite substitution is chelated, in the preheating cooperation spray of II section 140
Enter urea powder, be respectively formed desulfurization reaction zone A and denitration reaction area B, so as to effectively realize pre-desulfurization denitration.
The Ca of the present embodiment2+Chelate urea intercalation compound bentonite includes following components by mass percentage: 2.5-10wt.%
Urea, 2.5-10wt.% Ca (OH)2With the bentonite of 80-95wt.%, and Ca2+Chelating urea intercalation compound bentonite is powder
Shape is less than 0.074mm grain size content >=95wt.%, is prepared according to the following steps when preparing:
P1, add water to digest quick lime, be made into Ca (OH)2Saturated solution is inwardly added and Ca (OH)2Etc. quality urea,
It stirs；
P2, by mixed solution heating stirring, so that mixed solution is evaporated to reactant in molten state；Specifically, it will mix molten
Liquid is under the conditions of 100-120 DEG C, constant temperature stirring, heating 0.5-3h；
P3, bentonite and with addition of moisture is added into above-mentioned fusant, stirs evenly；Specifically, bentonitic matter is added
Amount is Ca (OH)2With 4-19 times of urea quality sum, and with addition of the moisture of mass percent 5-8wt.%, then stir evenly；
P4, it said mixture is placed at room temperature carries out microwave heating treatment after a period of time and makes its agglomeration, it then will knot
Block material be finely ground to it is powdered to obtain the final product, specifically, mixture is placed into 10-14h at room temperature, is subsequently placed in microwave oven
In, temperature control be 80-100 DEG C, heat 0.5-2h, then by caking materials be finely ground to less than 0.074mm grain size content >=
95wt.%.
Desulphurization denitration process in the present embodiment can also control respectively, specific as follows:
When 1.0-4.0wt.%Ca is added in green-ball preparation process2+Chelating urea intercalation compound bentonite, preheating II section 140 are not sprayed
When entering urea powder, this method only realizes flue gas pre-desulfurization；
When NO mole in the preheating penetrating urea powder mole≤1/2 times flue gas of II section 140, in green-ball preparation process not
Ca is added2+When chelating urea intercalation compound bentonite, this method only realizes the preparatory denitration of flue gas；
When preheat II section 140 penetrating 1/2 times of flue gas of excess urea powder mole > in NO mole when, no matter green-ball system
Whether Ca is added during standby2+Urea intercalation compound bentonite is chelated, this method realizes flue gas pre-desulfurization denitration simultaneously, but gives birth to simultaneously
1.0-4.0wt.%Ca is added in ball preparation process2+Urea intercalation compound bentonite is chelated, this method effectively strengthens pre-desulfurization effect.
The present embodiment in green-ball preparation process by adding a certain amount of Ca2+Urea intercalation compound bentonite is chelated, green-ball enters
When the drying I section 110 of drying grate 100 and dry II section 120, Ca2+Chelating urea intercalation compound bentonite starts slow release NH3, add
Upper a large amount of water evaporations, the SO into 100 lower part bellows of drying grate and pipeline, with hot wind2Following reaction occurs:
NH3+H2O+SO2=NH4HSO8
2NH8+H2O+SO2=(NH4)2SO8
NH3+H2O+SO3=NH4HSO4
2NH3+H2O+SO3=(NH4)2SO4
Make gaseous SO2It is converted into solid NH4HSO4、(NH4)2SO4、NH4HSO3Or (NH4)2SO3, in subsequent dedusting
Enter dust in journey, to make the SO in exhaust gas2Content significantly reduces, and realizes qualified discharge.Wherein, Ca2+Chelate urea intercalation
Bentonite is 20-50 DEG C high compared with common urea decomposition temperature, and thermal stability is strong, slows down NH3Release extends regional area NH3With SO2、
H2In the reaction time of O, react fully progress, achievees the purpose that improve desulfuration efficiency.Ca2+Chelate the grain of urea intercalation compound bentonite
Requirement -0.074mm grain size content >=95% is spent, is on the one hand conducive to be scattered in pelletizing to give full play to cementation；Meanwhile it can
Make to be reduced to minimum to the adverse effect of pellet strength after wherein can decompose substance pyrolytic.Pass through urea powder, storage spray
It blows to drying grate 100 and preheats II section 140, using selective non-catalytic reduction principle, the NH thermally decomposed with urea3For reduction
Agent, by NO in 800-950 DEG C of interval rangexIt is reduced to N2, realize the purpose of denitrating flue gas.Preheating 140 temperature range of II section is
750-1000 DEG C, it can satisfy the temperature requirement of selective non-catalytic reduction, blowing urea powder can utmostly reduce sprinkling
Substance reduces the influence to original process to the adverse effect of in-furnace temperature, by the straying quatity of control preheating 140 urea of II section and
When the ratio between mole of NOx is less than or equal to 1/2, the ammonia of decomposition is only for denitration reaction；When the straying quatity of urea and mole of NOx
When the ratio between amount is greater than 1/2, on the basis of preheating 140 denitration of II section, part is may be implemented when entering dryer section 150 in circulating air
The function of desulfurization, concrete principle and dryer section 150 add Ca2+It is identical that chelating urea intercalation compound bentonite releases ammonia desulfurization.
Ca in the present embodiment2+It chelates quality Ca (OH) such as urea additions when prepared by urea intercalation compound bentonite2That prepares is full
It is reacted with solution, forms Ca2+Chelate urea, and it is subsequent be stirred with excessive bentonite, in maintenance processes into swollen
The interlayer structure for moistening soil can make the decomposition temperature of urea improve 20-50 DEG C, to help to improve desulfuration efficiency.The present embodiment
Middle urea and saturated limewater Hybrid Heating under the conditions of 100-120 DEG C should form Ca in the process2+Chelate urea, stability compared with
Common urea significantly improves, and decomposition temperature improves, decomposition rate reduces.Meanwhile by by Ca2+It chelates urea and bentonite is mixed
It closes, carries out intercalation with addition of a certain amount of moisture, the urea molecule of solubilised state enters in bentonite interlayer structure, is formed and stablizes knot
Structure, Ca2+It can promote the formation of chelating urea intercalation compound bentonite rock-steady structure, interlayer can form two layers of stable hydrone.Match
Ground is closed, the present embodiment is different from heat radiation heating using microwave heating, has the characteristics that entirety heats, and heating efficiency is high, is conducive to
Desulfurizing agent production efficiency improves；The presence of microwave action, also can extreme influence polariton substance molecule moving situation, make molecule it
Between effective collision increase, and the increase of effective collision will necessarily accelerate chemical reaction velocity, and molecule rotational energy level transition
Frequency is placed exactly in microwave frequency range.Corresponding molecule obtains energy and is possible to that the transition of energy level occurs, with a kind of Asia
Stable state exist in microwave field, molecule under this state be it is quite active, between molecule, molecule itself and chemical bond
Deng all easily changing, it is embodied in the increase of effective collision between molecule, the fracture of old key and formation all phases of new keys
To be very easy to, to Ca2+Chelating urea intercalation have significant facilitation, the urea tool of gained composite construction
There is higher decomposition temperature, the rate that ammonia is released in certain temperature range will also slow down, and improve desulfurization effect to reach
The purpose of rate.
The method of the present embodiment is by adding Ca in green-ball preparation process2+Urea intercalation compound bentonite is chelated, rotary kiln is made
The SO generated during 200 pelletizing preheating and bakings2When being recycled to 100 dryer section 150 of drying grate, is reacted with the ammonia of sustained release, is solid
Change and enter dedusting ash, significantly reduces the SO in exhaust gas2Content；Secondly, urea dry powder used can preheat II sections of realization SNCR
Denitration, excessive NH3Desulfidation, no the escaping of ammonia problem, to realize process pre-desulfurization can be played in subsequent dryer section 150
Denitration.
Embodiment 2
The grate of the present embodiment-rotary kiln pelletizing process pre-desulfurization denitration method, substantially same above-described embodiment, institute
Unlike, Ca in the present embodiment2+Chelate urea intercalation compound bentonite includes following components by mass percentage: 2.5wt.%'s
The Ca (OH) of urea, 2.5wt.%2With the bentonite of 95wt.%, preparation when:
P2, by mixed solution under the conditions of 100 DEG C, constant temperature stirring, heating 3h；
P3, bentonitic quality is added into above-mentioned fusant as Ca (OH)2With 19 times of urea quality sum, and with addition of matter
The moisture for measuring percentage 8wt.%, then stirs evenly；
P4, mixture is placed into 10h at room temperature, is subsequently placed in microwave oven, temperature control is 80 DEG C, heating
Then caking materials are finely ground to less than 0.074mm grain size content >=95wt.% by 2h.
Work as in green-ball preparation process when use and 1.0wt.%Ca is added2+Chelate urea intercalation compound bentonite.
Embodiment 3
The grate of the present embodiment-rotary kiln pelletizing process pre-desulfurization denitration method, substantially same above-described embodiment, institute
Unlike, Ca in the present embodiment2+Chelate urea intercalation compound bentonite includes following components by mass percentage: 10wt.%'s
The Ca (OH) of urea, 10wt.%2With the bentonite of 80wt.%, preparation when:
P2, by mixed solution under the conditions of 120 DEG C, constant temperature stirring, heating 0.5h；
P3, bentonitic quality is added into above-mentioned fusant as Ca (OH)2With 4 times of urea quality sum, and with addition of matter
The moisture for measuring percentage 5wt.%, then stirs evenly；
P4, mixture is placed into 14h at room temperature, is subsequently placed in microwave oven, temperature control is 100 DEG C, heating
Then caking materials are finely ground to less than 0.074mm grain size content >=95wt.% by 0.5h.
Work as in green-ball preparation process when use and 4.0wt.%Ca is added2+Chelate urea intercalation compound bentonite.
Embodiment 4
The grate of the present embodiment-rotary kiln pelletizing process pre-desulfurization denitration method, substantially same above-described embodiment, institute
Unlike, Ca in the present embodiment2+Chelate urea intercalation compound bentonite includes following components by mass percentage: the urine of 5wt.%
The Ca (OH) of element, 5wt.%2With the bentonite of 90wt.%, preparation when:
P2, by mixed solution under the conditions of 110 DEG C, constant temperature stirring, heating 2h；
P3, bentonitic quality is added into above-mentioned fusant as Ca (OH)2With 9 times of urea quality sum, and with addition of matter
The moisture for measuring percentage 6wt.%, then stirs evenly；
P4, mixture is placed into 12h at room temperature, is subsequently placed in microwave oven, temperature control is 90 DEG C, heating
Then caking materials are finely ground to less than 0.074mm grain size content >=95wt.% by 1h.
Work as in green-ball preparation process when use and 2.5wt.%Ca is added2+Chelate urea intercalation compound bentonite.
Schematically the present invention and embodiments thereof are described above, description is not limiting, institute in attached drawing
What is shown is also one of embodiments of the present invention, and actual structure is not limited to this.So if the common skill of this field
Art personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution
Similar frame mode and embodiment, are within the scope of protection of the invention.
Claims (9)
1. grate-rotary kiln pelletizing process pre-desulfurization denitration method, it is characterised in that: by the drying of drying grate (100)
Section I the section of drying (110) of (150) front end dry using exhausting, hot wind source use preheating I sections (130) and ring cold machine (300)
The gaseous mixture of cooling III sections (330), the exhausting of dryer section (150) rear end dry II sections (120) are still dry using exhausting；In life
Ca is added in ball preparation process2+Urea intercalation compound bentonite is chelated, urea is set on II sections of preheating (140) of drying grate (100)
Blowing device simultaneously sprays into urea powder, significantly reduces NOx and SOx content in flue gas.
2. grate according to claim 1-rotary kiln pelletizing process pre-desulfurization denitration method, it is characterised in that:
Ca2+Chelate urea intercalation compound bentonite includes following components by mass percentage: urea, the 2.5-10wt.% of 2.5-10wt.%
Ca (OH)2With the bentonite of 80-95wt.%.
3. grate according to claim 1-rotary kiln pelletizing process pre-desulfurization denitration method, it is characterised in that:
Ca2+Chelate urea intercalation compound bentonite be it is powdered, be less than 0.074mm grain size content >=95wt.%.
4. grate according to claim 1-rotary kiln pelletizing process pre-desulfurization denitration method, it is characterised in that:
1.0-4.0wt.%Ca is added in green-ball preparation process2+Chelate urea intercalation compound bentonite.
5. grate according to claim 1-rotary kiln pelletizing process pre-desulfurization denitration method, it is characterised in that:
Ca2+Chelating urea intercalation compound bentonite is prepared according to the following steps:
P1, add water to digest quick lime, be made into Ca (OH)2Saturated solution is inwardly added and Ca (OH)2Etc. quality urea, sufficiently
It stirs evenly；
P2, by mixed solution heating stirring, so that mixed solution is evaporated to reactant in molten state；
P3, bentonite and with addition of moisture is added into above-mentioned fusant, stirs evenly；
P4, it said mixture is placed at room temperature carries out microwave heating treatment after a period of time and makes its agglomeration, then will agglomerate object
Material be finely ground to it is powdered to obtain the final product.
6. grate according to claim 5-rotary kiln pelletizing process pre-desulfurization denitration method, it is characterised in that:
In step P2 by mixed solution under the conditions of 100-120 DEG C, constant temperature stirring, heating 0.5-3h.
7. grate according to claim 5-rotary kiln pelletizing process pre-desulfurization denitration method, it is characterised in that:
It is Ca (OH) that bentonitic quality is added in step P32With 4-19 times of urea quality sum, and with addition of mass percent 5-
The moisture of 8wt.%, then stirs evenly.
8. grate according to claim 5-rotary kiln pelletizing process pre-desulfurization denitration method, it is characterised in that:
In step P4 mixture is placed into 10-14h at room temperature, be subsequently placed in microwave oven, temperature control is 80-100 DEG C, is added
Then caking materials are finely ground to less than 0.074mm grain size content >=95wt.% by hot 0.5-2h.
9. grate according to claim 1-8-rotary kiln pelletizing process pre-desulfurization denitration method, special
Sign is: desulphurization denitration can control respectively, specific as follows:
When 1.0-4.0wt.%Ca is added in green-ball preparation process2+Chelating urea intercalation compound bentonite, II sections of preheating (140) do not spray into
When urea powder, this method only realizes flue gas pre-desulfurization；
It is not added when in NO mole in II sections of preheating (140) penetrating urea powder mole≤1/2 times flue gas, green-ball preparation process
Enter Ca2+When chelating urea intercalation compound bentonite, this method only realizes the preparatory denitration of flue gas；
When preheating NO mole in II sections (140) penetrating 1/2 times of flue gas of urea powder mole >, add in green-ball preparation process
Enter 1.0-4.0wt.%Ca2+Urea intercalation compound bentonite is chelated, this method realizes flue gas pre-desulfurization denitration simultaneously, and strengthens preparatory
Desulfurization effect.
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| CN113916010A (en) * | 2020-07-10 | 2022-01-11 | 中冶长天国际工程有限责任公司 | Rotary kiln-chain grate machine flue gas treatment process and system for flue gas treatment |
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