CN112279527A - Spiral three-stage quicklime digestion device and method - Google Patents
Spiral three-stage quicklime digestion device and method Download PDFInfo
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- CN112279527A CN112279527A CN202011295316.XA CN202011295316A CN112279527A CN 112279527 A CN112279527 A CN 112279527A CN 202011295316 A CN202011295316 A CN 202011295316A CN 112279527 A CN112279527 A CN 112279527A
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- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 title claims abstract description 170
- 239000000292 calcium oxide Substances 0.000 title claims abstract description 85
- 235000012255 calcium oxide Nutrition 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000029087 digestion Effects 0.000 title claims description 44
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 36
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 33
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 33
- 235000011116 calcium hydroxide Nutrition 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 54
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 27
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 27
- 239000004571 lime Substances 0.000 claims description 27
- 238000010009 beating Methods 0.000 claims 1
- 238000006243 chemical reaction Methods 0.000 abstract description 30
- 238000006477 desulfuration reaction Methods 0.000 abstract description 10
- 230000023556 desulfurization Effects 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 238000007599 discharging Methods 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000002156 mixing Methods 0.000 description 10
- 238000005507 spraying Methods 0.000 description 5
- 238000003756 stirring Methods 0.000 description 5
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 4
- 230000002349 favourable effect Effects 0.000 description 4
- 241001536352 Fraxinus americana Species 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- -1 this Chemical compound 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/02—Lime
- C04B2/04—Slaking
- C04B2/08—Devices therefor
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The invention belongs to the technical field of ferrous metallurgy desulfurization and denitrification, and particularly relates to a spiral three-stage quicklime slaking device and a method. The invention provides a spiral three-stage quicklime slaking device and method which are beneficial to reducing the desulfurization cost, can ensure full and complete slaking reaction, keep the slaked lime at a higher temperature, slake at any time, are stable and reliable, safe, convenient and fast to maintain.
Description
Technical Field
The invention belongs to the technical field of ferrous metallurgy desulfurization and denitrification, and particularly relates to a spiral three-stage quicklime digestion device and method.
Background
The prior art and the defects are as follows:
in the sintering process, desulfurization and denitrification become necessary environmental protection items after 2019, slaked lime is used as a desulfurizer, if slaked lime is purchased directly, the price is high (the price difference is 200 yuan/ton), other types of desulfurizers such as KR desulfurizer, high phosphorus desulfurizer and the like can be selected at the same time, or the generally adopted slaking devices are a blade rotating stirring type slaking device and a rotating water spraying slaking device, the blade rotating stirring type slaking device has the following defects that the slaking control time is fixed, the adjustability is poor, the slaking reaction requires that the white ash quality needs to ensure enough activity, otherwise, the slaking complete reaction cannot be met, the quality is poor, the rotating water spraying slaking device has a low water spraying head position, the white ash has high viscosity after slaking, the white ash is easy to block, the maintenance period is short, and the overhaul rate is high; meanwhile, the water spraying is not uniform, and the mixing effect is poor.
The difficulty and significance for solving the technical problems are as follows:
therefore, based on the problems, the spiral three-level quicklime slaking device and the spiral three-level quicklime slaking method are provided, the slaking reaction speed and the slaking reaction process can be adjusted according to different qualities of quicklime, the water spraying position is the highest point, the slaking reaction is not easy to block, the maintenance period is long, atomized water is formed by air pressing, full contact and uniform mixing of water and lime are facilitated, and the optimal uniform mixing effect is achieved; the full and complete reaction of slaking can be ensured, the slaked lime keeps higher temperature, slaking is carried out at any time, and the slaked lime is stable, reliable, safe, convenient and fast to maintain; meanwhile, the price of the quicklime is about 200 yuan/ton lower than that of the slaked lime, and the system has the advantages of low investment and energy consumption and is beneficial to reducing the cost.
Disclosure of Invention
The invention aims to provide a spiral three-stage quicklime slaking device and a method which have higher regulation performance (the speed and the progress of slaking reaction can be adjusted in the slaking process according to quicklime with different mass), the slaking reaction is more sufficient (atomized water is formed by air pressurization, so that the sufficient contact and uniform mixing of water and lime are more facilitated, the optimal uniform mixing effect is achieved), the reduction of the cost of raw materials consumed by desulfurization is facilitated, and the requirements of consumption along with use and consumption are met, so that the spiral three-stage quicklime slaking device and the method are stable, reliable, safe, convenient and convenient to maintain.
The technical scheme adopted by the invention for solving the technical problems in the prior art is as follows:
a spiral three-level quicklime slaking device comprises a lime slaking pipeline, a quicklime bin, a lime discharging valve, a feeding machine, a spiral slaker, a pressurizing fan and a slaked lime bin which are sequentially connected, wherein an atomizing nozzle is installed at the top of the spiral slaker and is used for supplying air through a pressure air pipe, a pressure water pipe is used for supplying water, a spiral stirring rod is arranged in the spiral slaker and is driven by a motor;
the lime slaking device comprises a lime slaking bin, a feeding port of the lime slaking bin, a discharging port of the lime slaking bin, a feeding port of a feeding machine, a discharging valve of the discharging port of the lime slaking bin, a conveying belt of the feeding machine, a discharging port of the feeding machine, a pressurizing fan of the screw digester and a lime slaking bin.
Adding water into quick lime to generate slaked lime, and supplying the slaked lime to a device used in a desulfurization process.
The invention can also adopt the following technical scheme:
in the above-mentioned spiral tertiary quick lime slaking device, further, pressure water pipe and pressure air pipe all are equipped with controllable valve.
The proportion of water and air flow is controlled by a controllable valve to meet the digestion requirement, atomized water is formed at an atomizing nozzle, and uniform diffusion into quicklime is facilitated.
In the spiral three-stage quicklime slaking device, the number of the atomizing nozzles is five, and the five water supply pipelines respectively guarantee water supply and five compressed air pipelines supply air sources.
Atomized water vapor is generated in the nozzle device through air pressure, and solid powdered quick lime is in full contact with atomized water sprayed by the atomizing nozzle.
In the spiral three-level quicklime slaking device, the spiral slaker is further divided into three levels, and the three levels are variable frequency motors.
The current can be adjusted according to the feeding amount of the quicklime and the temperature in the primary reactor, the rotating speed is adjusted, and the complete digestion reaction is ensured.
In the spiral three-level quicklime slaking device, furthermore, the length of each level of the spiral slaker is 3-4 meters, and the rotating speed is controlled at 0-1473 r/min.
In the spiral three-stage quicklime slaking device, the three stages of spiral slakers are connected in series.
The screw axis of one-level spiral digester runs through the casing, the screw axis drives the helical blade rotation, promote the quick lime that is being fully contacted with the atomized water to the afterbody transmission, quick lime is in digestion reaction simultaneously, rotating vane makes the lime intensive mixing, reach the bottom after, fall into the second grade spiral digester, the second grade spiral digester is abundant digestion reaction chamber, helical blade counter-rotation promotes the lime that is reacting and lime hydrate transmit to the head, fall into tertiary spiral digester, the screw axis drives the helical blade rotation, promote basic complete lime hydrate of reacting to the afterbody transmission.
The three-stage digestion device is a three-layer device, so that the arrangement space is saved, and the three layers of different temperatures display, so that the digestion process can be obviously reflected. The adjustment of the rotating speed can adjust the digestion processes in the three stages, so that the three digestion processes are respectively ensured to be in the three-layer spiral digester.
In the spiral three-level quicklime slaking device, the blanking amount of the feeder is 3-6 tons/hour, and the total time from feeding to feeding of the slaked lime into the slaked lime bin is 30-40 minutes.
The feeding amount is matched according to the maximum water adding amount and the rotating speed, and the transportation time of 30-40 minutes can ensure that the full digestion reaction is completed in the digester.
In the spiral three-level quicklime slaking device, the capacity of the pressurizing fan is 25-40 KPa.
After the quicklime is digested by adding water, CaO + H2O＝Ca(OH)2And the quality is changed, the required fan capacity must be matched, and the pressure can be ensured to be enough to ensure that the slaked lime enters the slaked lime bin.
A three-level quicklime digestion method adopts any one of the spiral three-level quicklime digestion devices.
In the above three-stage quicklime slaking method, further, the three-stage quicklime slaking method comprises the steps of:
the temperature range in the primary spiral digester is 140-160 ℃, if the temperature does not meet the range requirement, the digestion is not complete, the water adding amount needs to be properly increased according to the feeding amount, and the rotating speed needs to be reduced; if the temperature exceeds the range, the rotating speed is increased to ensure that the temperature range in the secondary spiral digester reaches 150-.
The quick lime is externally collected, the calcium-containing quality is slightly different, the activity degree is slightly different, the digestion reaction process is different, and the operation adjustment of the first-level, second-level and third-level spiral digesters can aim at the calcium-containing quality and the activity degree of different quick lime so as to meet the requirement of the complete digestion reaction of the quick lime.
In conclusion, the invention has the following advantages and positive effects:
1. the invention is improved on the basis of a blade stirring type in a quicklime digestion mode, solid quicklime powder and atomized water are uniformly mixed through spiral rotation, a digestion reaction is carried out along with three-stage spiral rotation, a diffusion liquid film on the surface of a solid becomes thin, the mixing strength is increased, and the digestion process of quicklime is accelerated while the diffusion of reactants is increased inevitably. Sufficient and complete digestion reaction can be ensured, the digestion reaction can be rapidly completed, higher digestion temperature is reached, and the denitration requirement of the denitration process is met. Has the advantages that: the method is favorable for reducing the desulfurization cost, can ensure full and complete digestion reaction, keeps higher temperature of the slaked lime, is convenient to digest at any time, is stable and reliable, and is safe, convenient and convenient to maintain.
Drawings
The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and examples, but it should be understood that these drawings are designed for illustrative purposes only and thus do not limit the scope of the present invention. Furthermore, unless otherwise indicated, the drawings are intended to be illustrative of the structural configurations described herein and are not necessarily drawn to scale.
Fig. 1 is a schematic structural view of the present invention.
In the figure:
1. the system comprises a lime slaking pipeline, a slaked lime bin, a quicklime bin, a slaked lime bin, a lime discharging valve, a feeder, a atomizing nozzle, a pressure air pipe, a pressure water pipe, a screw digester, a screw compressor, a screw slaker, a screw pump, a screw.
Detailed Description
The present invention will be specifically described with reference to fig. 1.
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
the first embodiment is as follows:
a spiral three-level quicklime slaking device comprises a lime slaking pipeline, a quicklime bin, a lime discharging valve, a feeding machine, a spiral slaker, a pressurizing fan and a slaked lime bin which are sequentially connected, wherein an atomizing nozzle is installed at the top of the spiral slaker and is used for supplying air through a pressure air pipe, a pressure water pipe is used for supplying water, a spiral stirring rod is arranged in the spiral slaker and is driven by a motor;
the lime slaking device comprises a lime slaking bin, a feeding port of the lime slaking bin, a discharging port of the lime slaking bin, a feeding port of a feeding machine, a discharging valve of the discharging port of the lime slaking bin, a conveying belt of the feeding machine, a discharging port of the feeding machine, a pressurizing fan of the screw digester and a lime slaking bin.
The slaking reaction is carried out on the quicklime, and the slaked lime is generated by adding water into the quicklime, so that the desulfurization requirement is met, and the slaked lime is supplied to a device used in the desulfurization process.
The quick lime feed bin of the device guarantees even unloading (generally control at 4-5 tons) through the unloading valve, carries out even material through the batcher and carries, satisfies digestion device's ration demand. And the mixture is pressed by a fan and conveyed to a slaked lime bin for use.
Furthermore, it is also conceivable in the present invention that both the pressure water line and the pressure air line are provided with controllable valves.
The proportion of water and air flow is controlled by a controllable valve to meet the digestion requirement, atomized water is formed at an atomizing nozzle, and uniform diffusion into quicklime is facilitated.
It should be noted that the number of the atomizing nozzles is five, and five water supply pipelines respectively guarantee water supply and five compressed air pipelines supply air sources.
The device possesses 5 atomizer devices, guarantees water supply and 5 compressed air pipeline air feed sources by 5 water supply lines respectively, produces atomizing steam through atmospheric pressure in the nozzle device, and the pulverous quick lime of solid-state and atomizer spun atomized water carry out abundant contact.
Further, the invention also considers that the spiral digester is divided into three stages, and the three stages are all variable frequency motors.
The current can be adjusted according to the feeding amount of the quicklime and the temperature in the primary reactor, the rotating speed is adjusted, and the complete digestion reaction is ensured.
It is pointed out that the length of each stage of the spiral digester is 3-4 meters, and the rotating speed is controlled to be 0-1473 r/min.
It is to be noted that three stages of the spiral digesters are connected in series.
The screw axis of one-level spiral digester runs through the casing, the screw axis drives the helical blade rotation, promote the quick lime that is being fully contacted with the atomized water to the afterbody transmission, quick lime is in digestion reaction simultaneously, rotating vane makes the lime intensive mixing, reach the bottom after, fall into the second grade spiral digester, the second grade spiral digester is abundant digestion reaction chamber, helical blade counter-rotation promotes the lime that is reacting and lime hydrate transmit to the head, fall into tertiary spiral digester, the screw axis drives the helical blade rotation, promote basic complete lime hydrate of reacting to the afterbody transmission.
The quicklime and the water are fully mixed and combined in a spiral feeding mode, and are driven at a constant speed, so that digestion reaction is carried out while the driving is carried out. The whole quicklime is completely digested by a spiral three-stage quicklime slaking device, and slaked lime with the material temperature reaching about 70-90 ℃ is generated.
The three-stage digestion device is a three-layer device, so that the arrangement space is saved, and the three layers of different temperatures display, so that the digestion process can be obviously reflected. The adjustment of the rotating speed can adjust the digestion processes in the three stages, so that the three digestion processes are respectively ensured to be in the three-layer spiral digester.
Still further, it is also contemplated in the present invention that the feeding amount of the feeder is 3-6 tons/hour, and it takes 30-40 minutes from the start of feeding to the entry of the slaked lime into the slaked lime silo.
The feeding amount is matched according to the maximum water adding amount and the rotating speed, and the transportation time of 30-40 minutes can ensure that the full digestion reaction is completed in the digester.
It is noted that the booster fan capacity is 25-40 KPa.
After the quicklime is digested by adding water, CaO + H2O＝Ca(OH)2And the quality is changed, the required fan capacity must be matched, and the pressure can be ensured to be enough to ensure that the slaked lime enters the slaked lime bin.
The working process is as follows: when quick lime is squeezed into the quicklime bin through compressed air, through the even unloading of unloading valve and batcher, make quick lime evenly get into spiral tertiary quick lime slaking device, in the device, water is suppressed through compressed air, form the atomized water, be more favorable to the abundant of quick lime and water like this, even reaction, then through tertiary spiral digester, make its even reaction progressively form slaked lime, suppress through the fan and send into slaked lime bin spare with slaked lime, because slaked lime price is about 200 yuan per ton higher than quick lime price, can effectual reduction cost of raw and other materials through spiral tertiary quick lime slaking device, thereby produce higher profit.
Example two:
a three-level quicklime digestion method adopts any one of the spiral three-level quicklime digestion devices.
Still further, it is also contemplated in the present invention that the three-stage quicklime slaking method comprises the steps of:
the temperature range in the primary spiral digester is 140-160 ℃, if the temperature does not meet the range requirement, the digestion is not complete, the water adding amount needs to be properly increased according to the feeding amount, and the rotating speed needs to be reduced; if the temperature exceeds the range, the rotating speed is increased to ensure that the temperature range in the secondary spiral digester reaches 150-.
The quick lime is externally collected, the calcium-containing quality is slightly different, the activity degree is slightly different, the digestion reaction process is different, and the operation adjustment of the first-level, second-level and third-level spiral digesters can aim at the calcium-containing quality and the activity degree of different quick lime so as to meet the requirement of the complete digestion reaction of the quick lime.
In conclusion, the invention provides the spiral three-stage quicklime slaking device and the method which have higher regulation performance (the speed and the progress of the slaking reaction can be regulated in the slaking process according to the quicklime with different masses), the slaking reaction is more sufficient (atomized water is formed by air pressurization, the sufficient contact and the uniform mixing of the water and the lime are more favorable, the optimal uniform mixing effect is achieved), the reduction of the raw material cost consumed by desulfurization is favorable, and simultaneously the requirements of consumption along with use and consumption along with time are met, and the spiral three-stage quicklime slaking device and the method are stable, reliable, safe, convenient and.
The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. The utility model provides a spiral tertiary quick lime slaking device which characterized in that: spiral tertiary quick lime digestion device is including consecutive beating lime pipeline, lime storehouse, unloading valve, batcher, spiral digester, beat blower and lime hydrate storehouse, atomizing nozzle is installed at the top of spiral digester, atomizing nozzle is responsible for the air feed by pressure air pipe, and pressure water pipe is responsible for supplying water, establish the spiral puddler in the spiral digester, the spiral puddler is by motor drive.
2. The spiral three-stage quicklime slaking apparatus according to claim 1, wherein: and the pressure water pipe and the pressure air pipe are both provided with controllable valves.
3. The spiral three-stage quicklime slaking apparatus according to claim 1, wherein: the number of the atomizing nozzles is five, and the five water supply pipelines respectively guarantee water supply and five compressed air pipelines supply air sources.
4. The spiral three-stage quicklime slaking apparatus according to claim 1, wherein: the spiral digester is divided into three stages, and the three stages are all variable frequency motors.
5. The spiral three-stage quicklime slaking apparatus according to claim 4, wherein: the length of each stage of the spiral digester is 3-4 meters, and the rotating speed is controlled to be 0-1473 r/min.
6. The spiral three-stage quicklime slaking apparatus according to claim 4, wherein: the three stages of spiral digesters are connected in series.
7. The spiral three-stage quicklime slaking apparatus according to claim 1, wherein: the blanking amount of the feeder is 3-6 tons/hour, and 30-40 minutes are needed from the beginning of feeding to the moment that the slaked lime enters the slaked lime bin.
8. The spiral three-stage quicklime slaking apparatus according to claim 1, wherein: the capacity of the blower is 25-40 KPa.
9. A three-level quicklime digestion method is characterized by comprising the following steps: the three-level quicklime slaking method adopts the spiral three-level quicklime slaking device as claimed in any one of claims 1 to 8.
10. The three-stage quicklime slaking method according to claim 9, characterized in that: the three-level quicklime digestion method comprises the following steps:
the temperature range in the primary spiral digester is 140-160 ℃, if the temperature does not meet the range requirement, the digestion is not complete, the water adding amount needs to be properly increased according to the feeding amount, and the rotating speed needs to be reduced; if the temperature exceeds the range, the rotating speed is increased to ensure that the temperature range in the secondary spiral digester reaches 150-.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011295316.XA CN112279527A (en) | 2020-11-18 | 2020-11-18 | Spiral three-stage quicklime digestion device and method |
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| CN202011295316.XA CN112279527A (en) | 2020-11-18 | 2020-11-18 | Spiral three-stage quicklime digestion device and method |
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|---|---|---|---|---|
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2020
- 2020-11-18 CN CN202011295316.XA patent/CN112279527A/en active Pending
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