CN205995253U - A kind of cement kiln flue gas desulphurization system - Google Patents
A kind of cement kiln flue gas desulphurization system Download PDFInfo
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- CN205995253U CN205995253U CN201620776182.6U CN201620776182U CN205995253U CN 205995253 U CN205995253 U CN 205995253U CN 201620776182 U CN201620776182 U CN 201620776182U CN 205995253 U CN205995253 U CN 205995253U
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Abstract
A kind of cement kiln flue gas desulphurization system, including tank used for storing ammonia, delivery pump, ejecting gun, cement decomposing furnace, cement kiln precalcining system and automatic control system, cement kiln precalcining system includes multistage preheater, the tank used for storing ammonia is connected with ejecting gun by delivery pump, and the spray site of ejecting gun is located at the exit of second level preheater windspout barrel.Using the method for the system desulfurization, including the ammoniacal liquor of one, configuration 15% 25%；2nd, real-time detection SO2Concentration, according to SO in flue gas2Concentration, calculates, adjusts the emitted dose of ammoniacal liquor by automatic control system；3rd, according to the ammonia water spray amount calculated in step 2, ammoniacal liquor is injected in cement kiln precalcining system after injecting jet rifle after delivery pump supercharging, is sprayed positioned at the exit of cement kiln second level preheater windspout barrel., up to more than 95%, desulfuration efficiency is high for the utility model desulfuration efficiency, and ratio of ammonia-sulfur is 2～2.5, and operating cost is low.
Description
Technical field：
The utility model belongs to cement kiln cigarette technical field of desulfurization, and in particular to a kind of by the use of ammoniacal liquor as desulfurizing agent
Cement kiln flue gas desulphurization system.
Background technology
Substantial amounts of sulfur dioxide can be produced in the coal-fired utility production process such as thermal power plant, steel mill, Industrial Boiler, cement plant,
Sulfur dioxide can be oxidized to sulfuric acid mist or sulfate aerosol in an atmosphere, and it is the important predecessor for causing acid rain.Thermal power plant,
Steel mill, Industrial Boiler etc. are mostly supporting to have desulfurization equipment, the sulphur major part meeting that cement plant is produced in process of production due to which
Oxidized calcium uptake, so sulfur dioxide emissioning concentration is not high, most of production line can meet standard requirement.But some plant areas
Sulfur content of raw material is too high, and the concentration of emission of sulfur dioxide is also higher, in 200～2000mg/m3?.Country is to environmental protection in recent years
Requirement more and more stricter, according to newest cement production enterprise exhaust emission standard《Cement industry atmosphere pollutants emission standardses》
(GB4915-2013) regulation in, cement kiln sulfur dioxide maximal emission are less than 200mg/m3, key area is less than
100mg/m3.Therefore, for the enterprise that sulfur dioxide is exceeded, in the urgent need to a set of ripe cement kiln desulphurization system.
Sulphur in quality coal in cement kiln systems is brought into by raw material and fuel：1), sulfate present in raw material is in pre-heating system
It is generally do not form SO2Gas, generally can all enter kiln system.A portion sulfate can occur to divide in height temperate zone in kiln
Solution, the SO of generation2Gas is moved to kiln tail with kiln gas, when minimum two-stage preheater equitemperature lower region is reached, is condensate in
On the relatively low raw material of temperature, and enter in kiln with the heavy collection of raw material, the circulatory system between preheater and kiln formed,
And undecomposed sulfate then can leave kiln system with grog.The sulphur for existing in raw material otherwise is (mainly with sulfide
Form is present), then can be in 300～600 DEG C of oxidized generation SO2Gas, occurs mainly in the second level of five (four) level preheaters
The third level cyclone cylinder of cyclone cylinder or six grades of preheaters.2), in precalciner system, fuel is fed by kiln hood and dore furnace
Enter.The SO that dore furnace fuel combustion is generated2A large amount of activity CaO that the stove that can be decomposed is present absorb, the CaSO of generation4With material warp
Lowermost level cyclone cylinder is entered in kiln by kiln tail smoke-box.The SO that the fuel of kiln hood feeding is produced2Gas can be high in kiln with sulfate
The SO for producing is decomposed in temperate zone2The similar course of gas experience.
The SO that sulphur oxidation in raw material is produced2Can be partially absorbed when by higher level's cyclone cylinder, remaining is then with waste gas one
Road is discharged from preheater.If waste gas is used for drying material, SO2Absorbed in raw material mill further.600 are less than in temperature
In the case of DEG C, CaCO3To SO2Absorption efficiency to be far below CaO.CaCO in two-stage preheater above3Resolution ratio is extremely low, and
Only a small amount of CaO is got on from high-temperature part band by flue gas, and therefore absorption efficiency is very low.Along with the now relatively low and discharge of humidity
The front time of staying is shorter, SO2Concentration of emission may be very high.If there is organic sulfur compound, its oxidation behavior is connect with troilite
Closely.
Conventional desulfurization technique main at present is divided into dry desulfurization, semi-dry desulphurization and three class of wet desulphurization.Dry desulfurization
Technique includes reactant insufflation, hot raw material insufflation etc., and semi-dry desulphurization is mainly spray dry desulfurization method, wet desulphurization bag
Include the sulfur removal technologies such as the ammonia process of desulfurization, double alkali method desulfurizing, limestone-gypsum method.
Dry method and semi-dry desulfurizing process operating cost height, desulfuration efficiency are low, and being applied to cement kiln has very big restriction.
Dual alkali, lime stone-gypsum method are widely used in the industries such as thermal power plant, steel mill, Industrial Boiler, and desulfuration efficiency is high, but the type desulfurization
Technique once invests larger, operating cost height, overweight for ordinary cement business burden, does not also apply to.
Cement producing line has the features such as exhaust gas volumn is big, material multi is preheated, gas residence time is long, in addition in kiln system
The cyclical effect of also peculiar sulphur so that conventional sulfur removal technology is not particularly suited for cement kiln.Therefore, a kind of cement of exploitation is needed badly
Special inexpensive, the efficient sulfur removal technology of kiln.
Content of the invention
The purpose of this utility model is to provide a kind of cement kiln flue gas desulphurization system by the use of ammoniacal liquor as desulfurizing agent,
Solve the low technical problem of cement kiln desulfuration efficiency in prior art.
In order to solve the technical problem, the utility model is adopted the following technical scheme that：
A kind of cement kiln flue gas desulphurization system, including tank used for storing ammonia, delivery pump, ejecting gun, cement decomposing furnace, cement kiln
Precalcining system and automatic control system, cement kiln precalcining system include multistage preheater, and the tank used for storing ammonia is by conveying
Pump is connected with ejecting gun, and the spray site of ejecting gun is located at the exit of second level preheater windspout barrel, the ejecting gun at least
?；Pneumatic control valve is provided with pipeline between the port of export of the delivery pump and ejecting gun, in cement kiln precalcining system
Detection means is provided with, is electrically connected between detection means and pneumatic control valve and automatic control system.
Improve further, also include return duct, one end of the return duct is connected with the port of export of ammonium hydroxide delivery pump, another
End is connected with tank used for storing ammonia, is provided with return valve and ammoniacal liquor discharge pressure table on return duct.By adjusting backflow valve regulation backflow
Measure to control ammoniacal liquor discharge pressure, the pressure gauge on return duct shows ammoniacal liquor delivery pressure force value.
Improve further, the delivery pump is two, and is arranged in parallel, and is provided with system between delivery pump and tank used for storing ammonia
Main valve.Two delivery pumps are used alternatingly, and extend its service life, and when one of damage, another unlatching, it is ensured that
Desulphurization system normally can be run.
Improve further, on the pipeline between the port of export of the delivery pump and ejecting gun, be provided with needle-valve, Electromagnetic Flow
Meter, pressure switch, ammonia leak detector and ammoniacal liquor endless tube；Wherein, pneumatic control valve is arranged in parallel with needle-valve, and ammoniacal liquor enters ammoniacal liquor
Each ammonia water spray rifle is evenly distributed to after endless tube.Needle-valve is maintenance bypass valve, in addition, when pneumatic control valve is fully open
Shi Liuliang cannot still meet requirement and can suitably supplement flow by needle-valve.The flow monitoring of ammoniacal liquor is detected by electromagnetic flowmeter.
The pressure of ammoniacal liquor in pressure switch detection whole system, shutdown system of reporting to the police when hypertonia, ammonia leak detector are detected
Whether whole induction system has ammoniacal liquor to reveal, it is ensured that the safety of whole system.
Improve further, also include compressed air conveying device, including pressure-reducing valve, pressure gauge, check-valves and compressed air
Each ejecting gun distributed to by endless tube, the compressed air endless tube of compressed air, and ejecting gun is double-current spray gun body.Compressed air pressure
Position 0.3Mpa or so, ensures compressed air pressure by pressure-reducing valve, and pressure gauge shows the compressed air pressure after decompression.Non-return
Valve purpose is to prevent ammoniacal liquor from flowing backward in compressed air piping.Compressed air after decompression enters compressed air endless tube, by ring
Pipe is evenly distributed to every ejecting gun.Using double-current spray gun body, ammonia atomization is become droplet to spray in flue by compressed air,
Increase the contact area with sulfur dioxide, improve reaction efficiency.
Ammoniacal liquor is transferred to groove tank in-car ammoniacal liquor in tank used for storing ammonia by unloading ammonia pump, can have SNCR denitration in cement plant
System, is provided with as the denitrating system of reducing agent using ammoniacal liquor and unloads ammonia pump and tank used for storing ammonia, so the utility model is without the need for separately setting
Ammonia pump and tank used for storing ammonia are unloaded to reduce investment outlay, the utility model cement kiln flue gas desulphurization system can utilize SNCR denitration system
Equipment, most equipment can be shared with denitrating system, reduce by a cost of investment, and operational management is convenient.
Improve further, the ejecting gun is branched, and spray site is uniformly arranged on the inwall of second level preheater windspout barrel
On, the spray angle of ejecting gun is 20-40 degree, and ejecting gun is lateral spray type spray gun, and the side spray yawing moment phase of all ejecting guns
With deflection angle is 0-30 degree.By ejecting gun is set to lateral spray type, ammonia spraying is made to form ring eddy flow stream in flue
, fully ensure that area coverage.Because direct injection spray gun has larger blind area near the walling of flue of ring-shaped flue, and center
Domain lap is more, so can reduce blind area and overlapping region using lateral spray type spray gun, increases area coverage.
A kind of method for carrying out desulfurization using cement kiln flue gas desulphurization system, comprises the steps：
Step one, the ammoniacal liquor of configuration 15%-25%, and be transported in tank used for storing ammonia；
Step 2, SO is set by automatic control system2Concentration preset value, detection means real-time detection cement kiln divide in advance
SO in solution system flue gas2Concentration, and measured value is sent to automatic control system, automatic control system is according to preset value and actual measurement
The deviation of value calculates, adjusts the emitted dose of ammoniacal liquor in real time；
Step 3, according to the ammonia water spray amount calculated in step 2, by ammoniacal liquor after delivery pump supercharging injecting jet
It is injected in after rifle in cement kiln precalcining system, sprays positioned at the exit of cement kiln second level preheater windspout barrel, second
The temperature in level preheater exit is 350～500 DEG C；The ammoniacal liquor of penetrating and SO in flue gas2Generation desulphurization reaction：
SO2Absorption process：2NH3+H2O+SO2→(NH4)2SO3(1-1)；
Oxidizing process：(NH4)2SO3+O2→(NH4)2SO4(1-2)；
Decomposition reaction：3(NH4)2SO4→4NH3+N2+3SO2+6H2O (1-3)；
Resorption process：2SO2+2CaO+O2→2CaSO4(1-4)；
Wherein, SO2Absorption process and (NH4)2SO3Oxidizing process occurs in the preheater of the second level, and being rich in flue gas has
10% or so oxygen.Ammoniacal liquor and SO in the cyclone cylinder of the second level2React generation ammonium sulfite, sulfurous under excess oxygen
Sour ammonium can be oxidized to ammonium sulfate, and ammonium sulfate is attached on raw material with material to whereabouts, and now temperature can be raised, and ammonium sulfate exists
280 DEG C start to decompose, and have higher resolution ratio, decompose more than 513 DEG C completely more than 500 DEG C, produce NH after decomposition3、
N2、SO2And H2O, the SO of generation2A part is absorbed by CaO in raw material and generates CaSO4Enter dore furnace, part CaSO4Pyrolytic
Participate in the sulfur cycle process of quality coal in cement kiln systems, undecomposed CaSO4It is discharged kiln system；The SO that another part rises with flue gas2Enter
Enter in the preheater of the second level to continue and ammoniacal liquor reaction generates ammonium sulfate, circulation is formed, until most SO2All rows of being cured
Go out.
The main influence factor of desulfuration efficiency is to spray the position of reaction zone, and main consideration is chosen in the position of ammonia water spray point
Following factor：
1) spray site should be located at kiln system SO2After producing position, according to quality coal in cement kiln systems SO2Mechanism of production, in raw material
Sulfide in 300～600 DEG C of oxidized generation SO2Gas, occurs mainly in the second level cyclone cylinder of five (four) level preheaters
Or the third level cyclone cylinder of six grades of preheaters.
2) desulfurization reaction zone will avoid temperature too high, because desulfurization product ammonium sulfate high temperature can decompose moment, cause desulfurization
Efficiency reduces.Desulfurizing agent absorbs SO2Ammonium sulfate, ammonium sulfite are mainly produced afterwards, and ammonium sulfite can be oxidized to ammonium sulfate, sulfuric acid
Ammonium starts to decompose at 280 DEG C, has higher resolution ratio, decompose more than 513 DEG C completely more than 500 DEG C.Cement kiln
Two grades of cyclone cylinder outlet temperatures are generally 350～500 DEG C, and third level cyclone cylinder outlet temperature is 550～650 DEG C.
3) spray site is chosen in cement kiln precalcining system, can bring desulphurization reaction product into next stage with raw material
Cyclone cylinder in, participate in the sulfur cycle of kiln system, or even directly with somehow be expelled directly out, whole system investment and operating cost meeting
It is greatly decreased.
Therefore, the utility model is arranged on second level preheater cyclone mouth exit by ammonia position is sprayed, and can meet simultaneously
Three above requires, reaches and improve desulfuration efficiency, the purpose of reduction desulphurization cost.
Sulfur removal technology involved by the utility model start spray ammoniacal liquor after, SO2Concentration is down to emission limit by initial value
100mg/m320～30min is below needed, and the ammonium sulfate for being primarily due to desulphurization reaction generation enters the rotation of higher level with material
Can produce to decompose after in air duct at high operating temperatures and produce N2、NH3、SO2, decompose meeting after the SO2 for producing is moved upwards with flue gas
By ammonia absorption, a SO is formed again2Circulation.Part SO2Absorbed by the CaO in kiln system and production calcium sulfate is aoxidized, enter
Enter the sulfur cycle that kiln system participates in kiln system itself, final solidification is discharged.Therefore, start to spray SO after ammoniacal liquor2Will not reduce moment,
Meeting minimizing slowly, actual Engineering Projects are also demonstrated that so.
In addition, CaCO3Itself is to SO2Absorption efficiency very low, but spray into ammoniacal liquor in contain moisture, water and SO2Reaction
Generate sulfurous acid, sulfurous acid and with raw material in CaCO3React generation CO2And CaSO3, the presence of water can promote CaCO3Right
SO2Assimilation effect, CaSO3In O2In the presence of can be oxidized to CaSO4, CaSO4Kiln system is entered with material, participate in kiln
The sulfur cycle of system is discharged.As cement kiln flue-gas temperature is typically all higher, water and SO2Reaction time is short,
Therefore the amount that the partial reaction occurs is less.
Compared with prior art, the utility model has the advantages that：
1st, according to the mechanism of production of cement kiln sulfur dioxide, the sulfide in raw material starts near third level cyclone cylinder
Sulfur dioxide is generated, after desulfurizing agent inlet zone will be located at sulfur dioxide generation position, to ensure desulfurized effect, while will avoid
Inlet zone temperature is too high, directly by Decomposition of ammonium sulfate.Therefore inlet zone is normally at the second level outlet of five-stage whirlwind cylinder, improves
Desulfurized effect., up to more than 95%, desulfuration efficiency is high for the utility model desulfuration efficiency；By automatic control system, detection means
Calculate, adjust the emitted dose of ammoniacal liquor, SO in real time2With NH3 mol ratio 1 in ammoniacal liquor:2-1:2.5, operating cost is low.
2nd, the sulfur removal technology involved by the utility model can be real according to sulfur dioxide emissioning concentration real-time adjustment ammoniacal liquor flow
Existing Automated condtrol, it is ensured that desulfuration efficiency, while precise control ammoniacal liquor flow, it is to avoid the escaping of ammonia is too high to cause equipment corrosion.
3rd, desulfurizing agent supply unit of the present utility model is conveyed using centrifugal multistage pump multiple centrifugal pump, and metering distribution system is using pneumatic
Governor valve control flow.Conveying and metering distribution system are integrated into a set of equipment, and modularized design, floor space are little, work of constructing
Phase is short, and control system is incorporated into original denitrating system, or a set of new system of independent design, and operational management is convenient.
4th, the utility model is sprayed into desulfurizing agent in flue by the way of ring eddy flow using double-current spray gun body, it is ensured that
Area coverage and the time of staying are to reach optimal desulfuration efficiency.
5th, the utility model is run under the high temperature conditions using ammoniacal liquor as desulfurizing agent, and cost of investment is low, stable,
Impact to kiln system is less.
Description of the drawings
Fig. 1 is the utility model cement kiln flue gas desulphurization system schematic diagram.
Fig. 2 is the utility model cement decomposing furnace, cement kiln precalcining system schematic diagram.
Fig. 3 is lateral spray type Flow Field Distribution schematic diagram in embodiment one.
Fig. 4 is direct injection Flow Field Distribution schematic diagram in comparative example one.
Specific embodiment
For making the purpose of this utility model and technical scheme clearer, below in conjunction with the utility model embodiment to this
The technical scheme of utility model is clearly and completely described.
Embodiment one：
As shown in figure 1, a kind of cement kiln flue gas desulphurization system, the in-car ammoniacal liquor of groove tank is turned by ammoniacal liquor by unloading ammonia pump 1
Move in tank used for storing ammonia 2, SNCR denitration system in cement plant, can be had, can be provided with using denitrating system of the ammoniacal liquor as reducing agent
Ammonia pump and tank used for storing ammonia is unloaded, so the utility model does not typically separately set ammonia pump 1 and tank used for storing ammonia 2 is unloaded to reduce investment outlay.In ammoniacal liquor
Outlet is provided with out/stops the main valve 3 of desulphurization system ammoniacal liquor supply and drives/stop the second main valve 4 of denitrating system ammoniacal liquor supply, with
Just the ammoniacal liquor of switching different system is supplied at any time.
In the present embodiment, desulphurization system conveys ammoniacal liquor using two centrifugation delivery pumps 5, and the using and the reserved, by adjusting back
Stream valve 6 adjusts capacity of returns to control the discharge pressure of ammoniacal liquor, and the ammoniacal liquor discharge pressure table 7 on return duct shows ammoniacal liquor delivery pressure
Power.The flow of ammoniacal liquor is controlled by the valve opening of regulation pneumatic control valve 8, can be examined according to kiln tail on-line measuring device in real time
Survey SO2Concentration carry out controlling opening of valve, reach the purpose for automatically controlling.Needle-valve 9 is maintenance bypass valve；In addition, when pneumatic
When the conveying of 8 ammoniacal liquor of regulating valve is fully open, the flow of ammoniacal liquor still cannot meet requirement, can suitably supplement ammonia aqua stream by needle-valve 9
Amount.The flow monitoring of ammoniacal liquor is detected by electromagnetic flowmeter 10.Pressure switch 11 detects the pressure of whole system, during hypertonia
Can report to the police shutdown system, ammonia leak detector 12 detects whether whole induction system has ammoniacal liquor to reveal, it is ensured that the peace of whole system
Entirely.
Ammoniacal liquor is evenly distributed to each ejecting gun 18 after entering ammoniacal liquor endless tube 17.Ejecting gun 18 adopts double-current spray gun body,
Ammoniacal liquor is sprayed in flue using compressed air.Compressed air pressure position 0.3Mpa or so, ensures compression by pressure-reducing valve 13
Air pressure, pressure gauge 14 show the compressed air pressure after decompression.15 purpose of check-valves is to prevent ammoniacal liquor from flowing backward to compression sky
In feed channel.Compressed air after decompression enters compressed air endless tube, is evenly distributed to every spray gun by endless tube.
When ammoniacal liquor enters inlet zone, according to high temperature ammonia process reaction mechanism and cement kiln SO2Mechanism of production, inlet zone temperature
Can not be too high, Decomposition of ammonium sulfate is prevented, also needs the SO for ensureing to produce in all of stove2All through conversion zone, most suitable position
Setting on two grades of cyclone cylinder exhaust pass, as shown in Figure 2.
As shown in figure 3, setting six ejecting guns, a diameter of 6m of second level preheater windspout barrel, ejecting gun atomization distance are equal
3.5m is taken, spray angle is 30 °, using lateral spray type ejecting gun, deflection angle α is 19 °, then the flue cross section ammonia of six direct-injection rifles
Water spray coverage rate is 44.66%.
The selection mode of side spray rifle spray angle α is：Flue diameter is divided into by n spray site according to spray gun quantity n, even
Adjacent ejected dots AB is met, the center line C of AB is taken, the line of the midpoint D and spray site A that connect OC, OC is spray centerline, AD and OA
Angle be jet angle α, through calculating, the area coverage of the jet angle had a distinct increment compared with the area coverage of direct injection spray gun,
So as to raising reaction efficiency is reached, reduce the purpose of ammoniacal liquor consumption.
Comparative example one：
As shown in figure 4, setting six ejecting guns, arranged using direct injection, i.e. a diameter of 6m of second level preheater windspout barrel,
Ejecting gun atomization distance all takes 3.5m, and spray angle is 30 °, and other are identical with embodiment one.It is computed, six direct-injection rifles
Flue cross section ammonia spraying coverage rate is 34.95%.
Embodiment one and comparative example one compare：
By contrast, arrange with direct injection using lateral spray type ejecting gun is relative, coverage rate is increased than direct injection spray gun
9.71%, desulphurization reaction efficiency is improved so as to reach, reduce the purpose of ammoniacal liquor consumption.
Embodiment two：
A kind of method for carrying out desulfurization using cement kiln flue gas desulphurization system, comprises the steps：
Step one, the ammoniacal liquor of configuration 15%-25%, and be transported in tank used for storing ammonia；
Step 2, SO is set by automatic control system2Concentration preset value, detection means real-time detection cement kiln predecomposition
SO in system flue gas2Concentration, and measured value is sent to automatic control system, automatic control system is according to preset value and measured value
Deviation calculate, adjust the emitted dose of ammoniacal liquor in real time；
Step 3, according to the ammonia water spray amount calculated in step 2, by ammoniacal liquor after delivery pump supercharging injecting jet
It is injected in after rifle in cement kiln precalcining system, sprays positioned at the exit of cement kiln second level preheater windspout barrel, second
The temperature in level preheater exit is 350～500 DEG C；The ammoniacal liquor of penetrating and SO in flue gas2Generation desulphurization reaction：
SO2Absorption process：2NH3+H2O+SO2→(NH4)2SO3(1-1)；
Oxidizing process：(NH4)2SO3+O2→(NH4)2SO4(1-2)；
Decomposition reaction：3(NH4)2SO4→4NH3+N2+3SO2+6H2O (1-3)；
Resorption process：2SO2+2CaO+O2→2CaSO4(1-4)；
Wherein, SO2Absorption process and (NH4)2SO3Oxidizing process occurs in the preheater of the second level, and being rich in flue gas has
10% or so oxygen.Ammoniacal liquor and SO in the cyclone cylinder of the second level2React generation ammonium sulfite, sulfurous under excess oxygen
Sour ammonium can be oxidized to ammonium sulfate, and ammonium sulfate is attached on raw material with material to whereabouts, and now temperature can be raised, and ammonium sulfate exists
280 DEG C start to decompose, and have higher resolution ratio, decompose more than 513 DEG C completely more than 500 DEG C, produce NH after decomposition3、
N2、SO2And H2O, the SO of generation2A part is absorbed by CaO in raw material and generates CaSO4Enter dore furnace, part CaSO4Pyrolytic
Participate in the sulfur cycle process of quality coal in cement kiln systems, undecomposed CaSO4It is discharged kiln system；The SO that another part rises with flue gas2Enter
Enter in the preheater of the second level to continue and ammoniacal liquor reaction generates ammonium sulfate, circulation is formed, until most SO2All rows of being cured
Go out.
The main influence factor of desulfuration efficiency is to spray the position of reaction zone, and main consideration is chosen in the position of ammonia water spray point
Following factor：
1) spray site should be located at kiln system SO2After producing position, according to quality coal in cement kiln systems SO2Mechanism of production, in raw material
Sulfide in 300～600 DEG C of oxidized generation SO2Gas, occurs mainly in the second level cyclone cylinder of five (four) level preheaters
Or the third level cyclone cylinder of six grades of preheaters.
2) desulfurization reaction zone will avoid temperature too high, because desulfurization product ammonium sulfate high temperature can decompose moment, cause desulfurization
Efficiency reduces.Desulfurizing agent absorbs SO2Ammonium sulfate, ammonium sulfite are mainly produced afterwards, and ammonium sulfite can be oxidized to ammonium sulfate, sulfuric acid
Ammonium starts to decompose at 280 DEG C, has higher resolution ratio, decompose more than 513 DEG C completely more than 500 DEG C.Cement kiln
Two grades of cyclone cylinder outlet temperatures are generally 350～500 DEG C, and third level cyclone cylinder outlet temperature is 550～650 DEG C.
3) spray site is chosen in cement kiln precalcining system, can bring desulphurization reaction product into next stage with raw material
Cyclone cylinder in, participate in the sulfur cycle of kiln system, or even directly with somehow be expelled directly out, whole system investment and operating cost
Can be greatly decreased.
Therefore, the utility model is arranged on second level preheater cyclone mouth exit by ammonia position is sprayed, and can meet simultaneously
Three above requires, reaches and improve desulfuration efficiency, the purpose of reduction desulphurization cost.
Sulfur removal technology involved by the utility model start spray ammoniacal liquor after, SO2Concentration is down to emission limit by initial value
100mg/m320～30min is below needed, and the ammonium sulfate for being primarily due to desulphurization reaction generation enters the rotation of higher level with material
Can produce to decompose after in air duct at high operating temperatures and produce N2、NH3、SO2, decompose meeting after the SO2 for producing is moved upwards with flue gas
By ammonia absorption, a SO is formed again2Circulation.Part SO2Absorbed by the CaO in kiln system and production calcium sulfate is aoxidized, enter
Enter the sulfur cycle that kiln system participates in kiln system itself, final solidification is discharged.Therefore, start to spray SO after ammoniacal liquor2Will not reduce moment,
Meeting minimizing slowly, actual Engineering Projects are also demonstrated that so.
In addition, CaCO3Itself is to SO2Absorption efficiency very low, but spray into ammoniacal liquor in contain moisture, water and SO2Reaction
Generate sulfurous acid, sulfurous acid and with raw material in CaCO3React generation CO2And CaSO3, the presence of water can promote CaCO3Right
SO2Assimilation effect, CaSO3In O2In the presence of can be oxidized to CaSO4, CaSO4Kiln system is entered with material, participate in kiln
The sulfur cycle of system is discharged.As cement kiln flue-gas temperature is typically all higher, water and SO2Reaction time is short,
Therefore the amount that the partial reaction occurs is less.
Do not do in the utility model illustrate be prior art or can achieve by prior art, Er Qieben
Case is embodied as described in utility model and is only preferable case study on implementation of the present utility model, be not used for limiting this practicality
New practical range.Equivalence changes and modification that i.e. all contents according to the utility model claim are made, should all make
For technology category of the present utility model.
Claims (6)
1. a kind of cement kiln flue gas desulphurization system, it is characterised in that decompose including tank used for storing ammonia, delivery pump, ejecting gun, cement
Stove, cement kiln precalcining system and automatic control system, cement kiln precalcining system include multistage preheater, the tank used for storing ammonia
Connected with ejecting gun by delivery pump, the spray site of ejecting gun is located at the exit of second level preheater windspout barrel, and ejecting gun is extremely
Few one；Pneumatic control valve, cement kiln predecomposition system is provided with pipeline between the port of export of the delivery pump and ejecting gun
Detection means is provided with system, is electrically connected between detection means and pneumatic control valve and automatic control system.
2. cement kiln flue gas desulphurization system according to claim 1, it is characterised in that also include return duct, described time
One end of flow tube is connected with the port of export of ammonium hydroxide delivery pump, and the other end is connected with tank used for storing ammonia, is provided with return valve on return duct
With ammoniacal liquor discharge pressure table.
3. cement kiln flue gas desulphurization system according to claim 1 and 2, it is characterised in that the delivery pump is two,
And be arranged in parallel, system main valve is provided between delivery pump and tank used for storing ammonia.
4. cement kiln flue gas desulphurization system according to claim 3, it is characterised in that the port of export of the delivery pump with
Needle-valve, electromagnetic flowmeter, pressure switch, ammonia leak detector and ammoniacal liquor endless tube is provided with pipeline between ejecting gun；Wherein,
Pneumatic control valve is arranged in parallel with needle-valve, and ammoniacal liquor is evenly distributed to each ammonia water spray rifle after entering ammoniacal liquor endless tube.
5. cement kiln flue gas desulphurization system according to claim 4, it is characterised in that also include compressed air conveying dress
Put, including pressure-reducing valve, pressure gauge, check-valves and compressed air endless tube, the compressed air endless tube of compressed air distributes to each
Ejecting gun, ejecting gun are double-current spray gun body.
6. cement kiln flue gas desulphurization system according to claim 1, it is characterised in that the ejecting gun is branched, spray
On the inwall of second level preheater windspout barrel, the spray angle of ejecting gun is 20-40 degree to exit point even distribution, and ejecting gun is side
Spray formula spray gun, and the side spray yawing moment of all ejecting guns is identical, deflection angle is 0-30 degree.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106166437A (en) * | 2016-07-21 | 2016-11-30 | 南京西普环保科技有限公司 | A kind of cement kiln flue gas desulphurization system and method |
| CN107930376A (en) * | 2017-11-27 | 2018-04-20 | 浙江工业大学 | The cement kiln desulfurizer and technique of a kind of dry-and-wet combined |
| CN111450692A (en) * | 2020-05-26 | 2020-07-28 | 张亚莉 | Cement rotary kiln tail gas sulfur dioxide ultralow emission treatment device and process |
| CN114432860A (en) * | 2021-12-14 | 2022-05-06 | 武汉龙净环保工程有限公司 | Synergistic removal method for sulfur, nitrate and dust in cement flue gas |
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2016
- 2016-07-21 CN CN201620776182.6U patent/CN205995253U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106166437A (en) * | 2016-07-21 | 2016-11-30 | 南京西普环保科技有限公司 | A kind of cement kiln flue gas desulphurization system and method |
| CN106166437B (en) * | 2016-07-21 | 2019-02-12 | 南京西普环保科技有限公司 | A kind of cement kiln flue gas desulphurization system and method |
| CN107930376A (en) * | 2017-11-27 | 2018-04-20 | 浙江工业大学 | The cement kiln desulfurizer and technique of a kind of dry-and-wet combined |
| CN111450692A (en) * | 2020-05-26 | 2020-07-28 | 张亚莉 | Cement rotary kiln tail gas sulfur dioxide ultralow emission treatment device and process |
| CN114432860A (en) * | 2021-12-14 | 2022-05-06 | 武汉龙净环保工程有限公司 | Synergistic removal method for sulfur, nitrate and dust in cement flue gas |
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