CN206069374U - A kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system - Google Patents
A kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system Download PDFInfo
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- CN206069374U CN206069374U CN201621051645.9U CN201621051645U CN206069374U CN 206069374 U CN206069374 U CN 206069374U CN 201621051645 U CN201621051645 U CN 201621051645U CN 206069374 U CN206069374 U CN 206069374U
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Abstract
This utility model belongs to technical field of phosphorous chemical industry, and in particular to a kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system.The system includes：Material processing device, preheating, reduction and oxidation unit, dust arrester and hydrating apparatus, the material processing device are made up of the breaker, screening plant, mixing arrangement and the ball-making device that are sequentially connected；The preheating, reduction and oxidation unit include：Adjacent feed zone, drying tube preheating zone, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone successively, in the rotary hearth furnace feeding system feed bin stove, cloth is layer-by-layer distribution mode, and top layer is high coal blending amount pelletizing, and bottom is low coal blending amount pelletizing；The dust arrester includes：Containing P2O5Smoke inlet, containing P2O5Clean gas outlet and dust outlet；The hydrating apparatus include：Containing P2O5Purified gas entrance, phosphoric acid outlet.The system has adaptability to raw material wide, the advantages of without the need for drying, high low, production capacity and the high added value of product of consuming energy.
Description
Technical field
This utility model belongs to technical field of phosphorous chemical industry, and in particular to a kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system.
Background technology
The industrialized preparing process of phosphoric acid mainly has following several at present：(1) phosphoric acid by wet process：It is made of stones with sulfuric acid decomposition phosphorus ore
Phosphoric acid is taken, the method needs a large amount of high-quality rocks phosphate in powder and sulphuric acid, while producing a large amount of phosphogypsum slags.(2) thermal phosphoric acid：Electricity consumption
Oven process produces yellow phosphorus, and then burning absorbs preparing phosphoric acid, and the method needs a large amount of electric energy and middle high-grade phosphorus ore lump ore.(3) it is new
Kiln-process phosphoric acid technique：The key of Technology tackling key problem is should be by the reduction of phosphorus and oxidation reaction the two atmosphere requirements not
With effective isolation without prejudice to heat transfer each other and the mass transfer again in region.Such as Application No. CN200610018780.8 is special
Sharp document, the method for disclosing the phosphorous mine tailing preparing phosphoric acid after a kind of utilization flotation of phosphate rock byproduct building brick, by
Add Cab-O-sil, coke blacking (or colliery powder), Kaolin powder by mixing in phosphorus mine tailing, add water, it is old, with vacuum-extruder or
Brick machine production line molding, soaks glaze after drying, kiln loading vehicle enters tunnel cave, obtains phosphorous vapor and carbon monoxide after preheated, intensification,
Inhale through hydrated tower again and obtain strong phosphoric acid, fragment of brick is after heat exchange cooling as load-bearing brick product；Number of patent application is
The document of CN93111447.0 discloses one kind and rock phosphate in powder, Silicon stone, carbonaceous reducing agent adding additives is made two-layer compound pelletizing,
Control internal layer pelletizing CaO/SiO ＜ 0.6 or ＞ 6.5l, make carbon thermal reduction temperature of the pelletizing fusing point higher than phosphorus ore, outer layer pelletizing be
Carbonaceous material, to protect the carbon in internal layer pelletizing prematurely to aoxidize in flame furnace, while being supplied to maintenance fire as fuel
The energy of flame furnace temperature.But existing kiln-process phosphoric acid technique reduction is difficult to control to oxidizing atmosphere, and Phosphate ore reduction rate is low, with phosphorus ore
The increasingly depleted of resource, dilution, production cost also more and more higher, therefore, how to develop one kind and can widen raw material and utilize bar
Part, the system for preparing phosphoric acid for reducing power consumption, improving added value of product become the technical problem of this area urgent need to resolve.
Utility model content
This utility model is directed to the deficiencies in the prior art, it is proposed that a kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system.Should
System has adaptability to raw material wide, the advantages of without the need for drying, high low, production capacity and the high added value of product of consuming energy.
To solve above-mentioned technical problem, the technical solution adopted in the utility model is：
The utility model proposes a kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system.According to enforcement of the present utility model
Example, the system include：Material processing device, preheating, reduction and oxidation unit, dust arrester and hydrating apparatus, wherein：
The material processing device, by the breaker, screening plant, mixing arrangement and ball-making device group that are sequentially connected
Into；There is the material processing device ground phosphate rock entrance, reduction coal entrance, Silicon stone entrance, binding agent entrance and mixed material to go out
Mouthful, it is for by ground phosphate rock, reduction coal, Silicon stone and binding agent, Jing after broken, screening, dispensing mixes and suppress balling-up in proportion, made
Pelletizing is divided into low coal blending amount pelletizing and high coal blending amount pelletizing；The preheating, reduction and oxidation unit are improved rotary hearth furnace, are wrapped
Include：Adjacent feed zone, drying tube preheating zone, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone successively, wherein, it is described
Be provided with partition wall between drying tube preheating zone and the burner on sidewall reducing zone, the burner on sidewall reducing zone and the discharge zone it
Between be provided with barricade, the partition wall and barricade are extended downwardly by the roof of the rotary hearth furnace, and the cloth ring with the rotary hearth furnace
Shape furnace bottom keeps certain intervals；Wherein, the drying tube is arranged on the furnace wall side wall of the drying tube preheating zone, for institute
State drying tube preheating zone to be heated；The burner on sidewall reducing zone is provided with multiple burners on the inside of furnace wall, for the side wall
Burner reducing zone carries out burner mode heating；The feed zone furnace wall is provided with mixed material entrance, and the discharge zone is provided with stove
Slag is exported, and drying tube preheating zone furnace wall is provided with containing P2O5Exhanst gas outlet and pyrolysis gas outlet, the mixed material entrance with
The mixed material outlet of the material processing device is connected, for mixed material to be distributed into preheated, reduction successively in rotary hearth furnace
Reaction, after oxidation reaction to obtain containing P2O5Flue gas；The rotary hearth furnace feeding system arranges high coal blending amount pelletizing feed bin and low matches somebody with somebody
Coal amount pelletizing feed bin, the high coal blending amount pelletizing feed bin supply top layer cloth pelletizing in stove, low coal blending amount ball by feeding-distribution device
Group's feed bin supplies ply stratum pelletizing in stove by feeding-distribution device, so that cloth is layer-by-layer distribution mode in stove, top layer is
High coal blending amount pelletizing, bottom are low coal blending amount pelletizing；The dust arrester includes：Containing P2O5Smoke inlet, containing P2O5Purified gas go out
Mouth and dust outlet, it is described containing P2O5Smoke inlet is with the preheating, reduction and oxidation unit containing P2O5Exhanst gas outlet is connected,
For P will be contained2O5After flue gas dust arrester process described in, obtain containing P2O5Purified gas；The hydrating apparatus include：Containing P2O5Only
Activating QI entrance, phosphoric acid outlet, it is described containing P2O5Purified gas entrance is with the dust arrester containing P2O5Clean gas outlet is connected, and uses
In P will be contained2O5Purified gas obtain phosphoric acid Jing after aquation absorption.
Inventor has found, according to the system of this utility model embodiment, pelletizing need not be dried drying and can directly enter stove and subtract
Few equipment investment, sets up drying tube preheating zone in rotary hearth furnace, efficiently solve material and enter the stove initial stage because causing burner to block up powder more
The problem of plug；And the flow processing raw material of rotary hearth furnace is directly entered using wet bulb, technological process is shortened, equipment throwing is reduced
Money, production cost and energy consumption；This utility model realizes that Phosphate ore reduction, oxidation reaction are carried out in same stove simultaneously, aoxidizes
Institute's calorific requirement in the radiation-curable supply reduction process of heat that reaction is produced, effectively reduces extraneous supply energy consumption, reduces production energy
Consumption；Additionally, this utility model is using low grade rock phosphate and briquet replacing coke can adopt the colm of low fixed carbon, high volatile to make
For raw material, Phosphate ore reduction rate height, using the phosphorus ore of middle-low grade, widen raw material and utilize condition, while enriching product category, carry
High added value of product, and layer-by-layer distribution is adopted, material area reducing atmosphere is ensured, fabric thickness in stove is improved, can be effective
Utilization rate of equipment and installations is improved, and production capacity is greatly improved on the premise of guarantee product index is qualified, 2-4 is improved than traditional method production capacity
Times；And regenerative combustion technology is adopted, fuel cost can be reduced using inferior or low-rank fuel, can be at home and scarce
The area popularization of few natural gas and high-grade fuel.
According to embodiment of the present utility model, pyrolysis Flash Gas Compression Skid System is set up in preheating, reduction and oxidation unit preheating zone,
Pyrolysis gas clean unit that the pyrolysis Flash Gas Compression Skid System includes being sequentially connected, Oil-gas Separation unit, cooling unit, with pyrolysis
Gas entrance and coal gas, tar outlet, the pyrolysis gas outlet of the preheating zone and the pyrolysis gas entrance for being pyrolyzed Flash Gas Compression Skid System
It is connected.
According to embodiment of the present utility model, the horizontal cross-section of the preheating, reduction and oxidation unit is annular, described
Drying tube preheating zone annulus angle is 30 ° -100 °.
This utility model at least has the advantages that：
1., compared with conventional rotary hearth furnace is by the way of the heating of furnace wall burner on sidewall, increase in rotary hearth furnace of the present utility model
If drying tube preheating zone, efficiently solve the problems, such as that material enters the stove initial stage because causing powder burner to block more.
2. directly enter the flow processing raw material of rotary hearth furnace using wet bulb, shorten technological process, reduce equipment investment, life
Produce cost and energy consumption.
3. realize that Phosphate ore reduction, oxidation reaction are carried out in same stove, the radiation-curable supply of the heat that oxidation reaction is produced is also
Institute's calorific requirement during original, effectively reduces extraneous supply energy consumption, reduces energy consumption.
4. this utility model can adopt low fixed carbon, the colm of high volatile using low grade rock phosphate briquet replacing coke
Used as raw material, Phosphate ore reduction rate is high, using the phosphorus ore of middle-low grade, widens raw material and utilizes condition, while product category is enriched,
Improve added value of product.
5. this utility model adopts layer-by-layer distribution, ensures material area reducing atmosphere, improves fabric thickness in stove, effectively carry
High utilization rate of equipment and installations, on the premise of guarantee product index is qualified, production capacity is greatly improved, and improves 2-4 times than traditional method production capacity.
6. this utility model rotary hearth furnace adopts regenerative combustion technology, using inferior or low-rank fuel, reduces fuel
Cost, can be promoted with the area for lacking natural gas and high-grade fuel at home.
Description of the drawings
Fig. 1 is the schematic diagram that this utility model transforms rotary hearth furnace.
Fig. 2 prepares the method flow diagram of phosphoric acid for this utility model.
Fig. 3 prepares the system simple diagram of phosphoric acid for this utility model.
Wherein, feed zone 1, drying tube preheating zone 2, burner on sidewall reducing zone 3, discharge zone 4, flue 5, partition wall 6, barricade 7,
Drying tube 8, burner 9, material processing device S100, ground phosphate rock entrance 101, reduction coal entrance 102, Silicon stone entrance 103, binding agent
Entrance 104, mixed material outlet 105, preheating, reduction and oxidation unit S200, mixed material entrance 201, containing P2O5Exhanst gas outlet
202, coal gas, tar outlet 203, slag outlet 204, dust arrester S300, containing P2O5Smoke inlet 301, containing P2O5Purified gas go out
Mouth 302, dust outlet 303, hydrating apparatus S400, containing P2O5Purified gas entrance 401, phosphoric acid outlet 402.
Specific embodiment
In order that those skilled in the art more fully understand the technical solution of the utility model, with reference to specific embodiment
The utility model is described in further detail.The embodiments described below is exemplary, is only used for explaining that this practicality is new
Type, and it is not intended that to restriction of the present utility model.
The utility model proposes a kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system.According to enforcement of the present utility model
Example, Fig. 1 transform the schematic diagram of rotary hearth furnace for this utility model, and Fig. 3 prepares the system simple diagram of phosphoric acid for this utility model, join
According to shown in Fig. 1 and Fig. 3, the system includes：Material processing device S100, preheating, reduction and oxidation unit S200, dust arrester
S300 and hydrating apparatus S400, wherein：The material processing device has ground phosphate rock entrance 101, reduction coal entrance 102, Silicon stone
Entrance 103, binding agent entrance 104 and mixed material outlet 105, for phosphorus ore, reduction coal, Silicon stone and binding agent Jing are crushed,
After screening, dispensing is mixed in proportion, obtains mixed material；The preheating, reduction and oxidation unit include：Adjacent charging successively
Area 1, drying tube preheating zone 2, burner on sidewall reducing zone 3 and discharge zone 4, wherein, the drying tube preheating zone is burnt with the side wall
Partition wall 6 is provided between mouth reducing zone, barricade 7 between the burner on sidewall reducing zone and the discharge zone, is provided with, the partition wall and
Barricade is extended downwardly by the roof of the rotary hearth furnace, and keeps certain intervals with the cloth ring-shaped furnace bottom of the rotary hearth furnace；Its
In, the drying tube 8 is arranged on the furnace wall side wall of the drying tube preheating zone, for carrying out adding to the drying tube preheating zone
Heat；The burner on sidewall reducing zone is provided with multiple burners 9 on the inside of furnace wall, for carrying out burner side to the burner on sidewall reducing zone
Formula is heated；The feed zone furnace wall is provided with mixed material entrance 201, and the discharge zone is provided with slag outlet 204, the drying
Pipe preheating zone furnace wall is provided with containing P2O5Exhanst gas outlet 202 and pyrolysis gas outlet, the mixed material entrance and the Feedstock treating
The mixed material outlet of device is connected, for mixed material to be distributed into preheated, reduction reaction, oxidation reaction successively in rotary hearth furnace
Afterwards to obtain containing P2O5Flue gas.
Inventor has found, according to the system of this utility model embodiment, pelletizing need not be dried drying and can directly enter stove and subtract
Few equipment investment, sets up drying tube preheating zone in rotary hearth furnace, efficiently solve material and enter the stove initial stage because causing burner to block up powder more
The problem of plug；And the flow processing raw material of rotary hearth furnace is directly entered using wet bulb, technological process is shortened, equipment throwing is reduced
Money, production cost and energy consumption；This utility model realizes that Phosphate ore reduction, oxidation reaction are carried out in same stove simultaneously, aoxidizes
Institute's calorific requirement in the radiation-curable supply reduction process of heat that reaction is produced, effectively reduces extraneous supply energy consumption, reduces production energy
Consumption；Additionally, this utility model is using low grade rock phosphate and briquet replacing coke can adopt the colm of low fixed carbon, high volatile to make
For raw material, Phosphate ore reduction rate height, using the phosphorus ore of middle-low grade, widen raw material and utilize condition, while enriching product category, carry
High added value of product, and layer-by-layer distribution is adopted, material area reducing atmosphere is ensured, fabric thickness in stove is improved, can be effective
Utilization rate of equipment and installations is improved, and production capacity is greatly improved on the premise of guarantee product index is qualified, 2-4 is improved than traditional method production capacity
Times；And regenerative combustion technology is adopted, fuel cost can be reduced using inferior or low-rank fuel, can be at home and scarce
The area popularization of few natural gas and high-grade fuel.
According to embodiment of the present utility model, the material processing device, by the breaker, screening dress that are sequentially connected
Put, mixing arrangement and ball-making device are constituted.
According to embodiment of the present utility model, the concrete species of the breaker is unrestricted, if can reach by
The effect of the broken powdering of lump material, can be metal breaker, stone breaker, hogging device or modeling
Material breaker, according to some embodiments of the present utility model, this utility model is preferably metal breaker or stone is broken
Device.
According to embodiment of the present utility model, the concrete species of the screening plant and method are unrestricted, as long as can
Play a part of granule size different mixed materials is divided into various granularity level with compass screen surface with holes, can be turn
Sieve or shaking screen, independent screening, auxiliary screening or dehydration screening, according to some embodiments of the present utility model, this utility model
Preferably revolving screen or auxiliary screening.
According to embodiment of the present utility model, the concrete species of the ball-making device is unrestricted, as long as can play thing
Material makes pelletizing shape.
According to embodiment of the present utility model, the preheating, reduction and oxidation unit are improved rotary hearth furnace, wherein institute
The model for stating rotary hearth furnace is unrestricted, as long as can play including high coal blending amount pelletizing feed bin and low coal blending amount pelletizing feed bin i.e.
Can, it is preferred that according to some embodiments of the present utility model, the rotary hearth furnace feeding system arrange high coal blending amount pelletizing feed bin and
Low coal blending amount pelletizing feed bin, the high coal blending amount pelletizing feed bin supply top layer cloth pelletizing in stove, low coal blending by feeding-distribution device
Amount pelletizing feed bin supplies ply stratum pelletizing in stove by feeding-distribution device, so that cloth is layer-by-layer distribution mode in stove, pushes up
Layer is high coal blending amount pelletizing, and bottom is low coal blending amount pelletizing.
Using layer-by-layer distribution, at the reduction reaction initial stage as upper strata pelletizing carbon content is high, part oxidation of coal can eliminate material
The unnecessary oxygen in area, as carbon surplus is oxidized to reducibility gas CO, quickly realizes material area reducing atmosphere, reduces in phosphorus ore pelletizing
With carbon scaling loss, Phosphate ore reduction rate is improved, raw material is widened and is utilized condition, mid low grade phosphate rock can be used；Additionally, layer-by-layer distribution can
Fabric thickness in stove is improved, utilization rate of equipment and installations can be effectively improved, production capacity is greatly improved on the premise of guarantee product index is qualified,
2-4 times is improved than traditional method production capacity.
There is reduction reaction in material reducing zone and produce phosphorous vapor in phosphorus ore pelletizing, make the stove top be in by controlling air-fuel ratio
Weak oxide atmosphere, and the reducing atmosphere in material area is not destroyed, it is anti-to there is oxidation in furnace roof zoneofoxidation in phosphorous vapor obtained by reducing zone
Should, realize that Phosphate ore reduction, oxidation reaction are carried out in same stove, in the radiation-curable supply reduction process of the heat that oxidation reaction is produced
Institute's calorific requirement, reducing because adjusting air-fuel ratio the furnace temperature fluctuation that brings, effectively reducing extraneous supply energy consumption, reducing production energy
Consumption.
According to embodiment of the present utility model, the concrete shape of the horizontal cross-section of the preheating, reduction and oxidation unit is not
It is restricted, according to some embodiments of the present utility model, this utility model is preferably annular, drying tube preheating zone annulus
Angle is 30 ° -100 °.This utility model rotary hearth furnace drying tube preheating zone annulus angle is no less than 30 °, if annulus angle is less than
30 °, then material is too short in preheating zone remaining time, can cause phosphorus ore moisture removal not exclusively, and residual moisture is removed in reducing zone
Material area reproducibility is affected, and reduces the percent reduction of valuable metal, but senior general is crossed when rotary hearth furnace preheating zone annulus angle affecting reduction
The reduction effect of area's material, so control preheating zone annulus angle is not more than 100 °.
According to embodiment of the present utility model, with reference to shown in Fig. 3, the dust arrester includes：Containing P2O5Smoke inlet 301,
Containing P2O5Clean gas outlet 302 and dust outlet 303, it is described containing P2O5Smoke inlet and the preheating, reduction and oxidation unit
Containing P2O5Exhanst gas outlet is connected, for containing P2O5After flue gas dust arrester process described in, obtain containing P2O5Purified gas.
According to embodiment of the present utility model, with reference to shown in Fig. 3, the hydrating apparatus include：Containing P2O5Purified gas entrance
401st, phosphoric acid outlet 402, described containing P2O5Purified gas entrance is with the dust arrester containing P2O5Clean gas outlet is connected, and is used for
P will be contained2O5Purified gas obtain phosphoric acid Jing after aquation absorption.
According to embodiment of the present utility model, pyrolysis Flash Gas Compression Skid System is set up in preheating, reduction and oxidation unit preheating zone,
Pyrolysis gas clean unit that the pyrolysis Flash Gas Compression Skid System includes being sequentially connected, Oil-gas Separation unit, cooling unit, with pyrolysis
Gas entrance and coal gas, tar outlet 203, the pyrolysis gas outlet of the preheating zone are entered with the pyrolysis gas of the pyrolysis Flash Gas Compression Skid System
Mouth is connected.
According to embodiment of the present utility model, it is provided between the drying tube preheating zone and the burner on sidewall reducing zone
The concrete material of partition wall is unrestricted, as long as separation can be played a part of, can be refractory brick or fire resisting stamp mass etc.
According to some embodiments of the present utility model, this utility model is preferably refractory brick.
According to embodiment of the present utility model, the barricade being provided between the burner on sidewall reducing zone and the discharge zone
Concrete material is unrestricted, as long as stop can be played a part of, can for refractory brick or fire resisting stamp mass etc. according to
Some embodiments of utility model, this utility model are preferably refractory brick.
According to embodiment of the present utility model, the burner on sidewall reducing zone is provided with the concrete species and shape of multiple burners
It is unrestricted, as long as can be used in carrying out burner mode to the burner on sidewall reducing zone heats.
According to embodiment of the present utility model, the concrete shape of the drying tube is unrestricted, can be U-shaped, W shapes, p-shaped
Deng according to some embodiments of the present utility model, this utility model is preferably U-shaped.
In other side of the present utility model, this utility model provides one kind and prepares phosphorus using foregoing system
The method of acid.Fig. 2 prepares the method flow diagram of phosphoric acid for this utility model, and with reference to shown in Fig. 2, the method can include following
Step：
（1）Feedstock treating and ball processed:By ground phosphate rock, reduction coal and Silicon stone Jing after broken, screening dispensing in proportion, allocate into viscous
Balling-up is mixed and is suppressed after knot agent, made pelletizing is divided into low coal blending amount pelletizing and high coal blending amount pelletizing.
According to embodiment of the present utility model, the material processing device has ground phosphate rock entrance, reduction coal entrance, Silicon stone
The outlet of entrance, binding agent entrance and mixed material, for by phosphorus ore, reduction coal, Silicon stone and binding agent Jing after broken, screening by than
Example dispensing is mixed, and obtains mixed material.
According to embodiment of the present utility model, in the stove, cloth adopts layer-by-layer distribution mode, and top layer is high coal blending amount ball
Group, bottom are that feed bin is arranged in low coal blending amount pelletizing, and the rotary hearth furnace for two, and high coal blending amount pelletizing feed bin is filled by sub-material
Top layer cloth pelletizing in supply stove is put, low coal blending amount pelletizing feed bin supplies ply stratum pelletizing in stove by feeding-distribution device.
According to embodiment of the present utility model, the low coal blending amount pellet feed weight proportion is：100 weight of ground phosphate rock
Part, 20～40 weight portion of reduction coal, 20～50 weight portion of Silicon stone；The high coal blending amount pelletizing weight proportion is：100 weight of ground phosphate rock
Amount part, than the high 5-10 weight portions of low coal blending amount pelletizing, 20～50 weight portion of Silicon stone, the pelletizing particle diameter are reduction coal amount of allocating
8-16mm。
According to embodiment of the present utility model, the concrete species of the binding agent is unrestricted, according to of the present utility model
Some embodiments, this utility model be preferably bentonite, Kaolin, one or more of clay, the amount of allocating of binding agent is mixed
Close the 1-5% of material gross weight.
In raw material control allocate into suitable Silicon stone amount cause calcium monofluorophosphate. and carbon react CaO that reduction generates immediately with addition
SiO2Reaction generates calcium silicates, so as to effectively reduce the reduction temperature of calcium monofluorophosphate. so that reduction reaction is in relatively low temperature
Under can also carry out, additionally, allocating SiO into2Carbon thermal reduction temperature of the pelletizing fusing point higher than rock phosphate in powder in pelletizing can be made, so as to reduce
Energy consumption, it is ensured that production direct motion.
（2）Preheating, reduction and oxidation processes:The high coal blending amount pelletizing and low coal blending amount pelletizing are hierarchically distributed into and turn bottom
Pre- thermal reduction and oxidation processes are carried out in stove, is obtained containing P2O5Coal gas and coal tar that flue gas and pyrolysis of coal are produced.
According to embodiment of the present utility model, the preheating, reduction and oxidation unit include：Successively adjacent feed zone,
Drying tube preheating zone, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone.
According to embodiment of the present utility model, the drying tube preheating zone temperature of the preheating, reduction and oxidation unit is 450
DEG C -850 DEG C, the time is 20-40min；The reducing zone adopts burner on sidewall mode of heating, and reduction temperature is 1150 DEG C -1350
DEG C, the time is 20-50min.
Using layer-by-layer distribution, at the reduction reaction initial stage as upper strata pelletizing carbon content is high, part oxidation of coal can eliminate material
The unnecessary oxygen in area, as carbon surplus is oxidized to reducibility gas CO, quickly realizes material area reducing atmosphere, reduces in phosphorus ore pelletizing
With carbon scaling loss, Phosphate ore reduction rate is improved, raw material is widened and is utilized condition, mid low grade phosphate rock can be used；Additionally, layer-by-layer distribution can
Fabric thickness in stove is improved, utilization rate of equipment and installations can be effectively improved, production capacity is greatly improved on the premise of guarantee product index is qualified,
2-4 times is improved than traditional method production capacity.
There is reduction reaction in material reducing zone and produce phosphorous vapor in phosphorus ore pelletizing, make the stove top be in by controlling air-fuel ratio
Weak oxide atmosphere, and the reducing atmosphere in material area is not destroyed, it is anti-to there is oxidation in furnace roof zoneofoxidation in phosphorous vapor obtained by reducing zone
Should, realize that Phosphate ore reduction, oxidation reaction are carried out in same stove, in the radiation-curable supply reduction process of the heat that oxidation reaction is produced
Institute's calorific requirement, reducing because adjusting air-fuel ratio the furnace temperature fluctuation that brings, effectively reducing extraneous supply energy consumption, reducing production energy
Consumption.
（3）Dedusting and hydration process：By high temperature P2O5Gas is purified, washing process, obtains high concentration phosphorus acid product, smelting
Furnace slag can be used as cement raw material.
According to embodiment of the present utility model, the dust arrester includes：Containing P2O5Smoke inlet, containing P2O5Purified gas go out
Mouth and dust outlet, it is described containing P2O5Smoke inlet is with the preheating, reduction and oxidation unit containing P2O5Exhanst gas outlet is connected,
For P will be contained2O5After flue gas dust arrester process described in, obtain containing P2O5Purified gas.
According to embodiment of the present utility model, the hydrating apparatus include：Containing P2O5Purified gas entrance, phosphoric acid outlet, it is described
Containing P2O5Purified gas entrance is with the dust arrester containing P2O5Clean gas outlet is connected, for containing P2O5Purified gas Jing aquation is inhaled
After receipts, phosphoric acid is obtained.
Embodiment 1：
By ground phosphate rock：Reduction coal：Silicon stone：Bentonite according to proportioning is：100：20（Low coal blending）/30（High coal blending）：20：
3.4 carry out mixing is pressed into low coal blending amount pelletizing and high coal blending amount pelletizing, and made pelletizing adopts top layer for high coal blending amount pelletizing, bottom
Layer is distributed in rotary hearth furnace for low coal blending amount pelletizing layer-by-layer distribution mode, 500 DEG C of preheating zone temperature, 40 minutes time, reduction temperature
1150 DEG C, 50 minutes time, the annulus angle of preheating zone is 30 °, and rotary hearth furnace preheating zone arranges gas recovery system for oil, can be effective
Reclaim coal gas produced by pyrolysis of coal and coal tar in heating process, in stove phosphorus ore there is reduction, produced by after oxidation reaction
Containing P2O5Flue gas finally gives the phosphoric acid product of acid concentration 85% Jing after flue discharge after purified, aquation, discharge from discharge gate
High temperature furnace slag can be used as combustion air after air heat-exchanging device preheated air, and the slag after cooling can be used as cement life
Produce raw material.
Embodiment 2：
By ground phosphate rock：Reduction coal：Silicon stone：Kaolin according to proportioning is：100：30（Low coal blending）/36（High coal blending）：35：
5.8 carry out mixing is pressed into low coal blending amount pelletizing and high coal blending amount pelletizing, and made pelletizing adopts top layer for high coal blending amount pelletizing, bottom
Layer is distributed in rotary hearth furnace for low coal blending amount pelletizing layer-by-layer distribution mode, 600 DEG C of preheating zone temperature, 30 minutes time, reduction temperature
1250 DEG C, 40 minutes time, the annulus angle of preheating zone is 60 °, and rotary hearth furnace preheating zone arranges gas recovery system for oil, can be effective
Reclaim coal gas produced by pyrolysis of coal and coal tar in heating process, in stove phosphorus ore there is reduction, produced by after oxidation reaction
Containing P2O5Flue gas finally gives the phosphoric acid product of acid concentration 88% Jing after flue discharge after purified, aquation, discharge from discharge gate
High temperature furnace slag can be used as combustion air after air heat-exchanging device preheated air, and the slag after cooling can be used as cement life
Produce raw material.
Embodiment 3：
By ground phosphate rock：Reduction coal：Silicon stone：Clay according to proportioning is：100：40（Low coal blending）/44（High coal blending）：50：9.5
Carry out mixing and be pressed into low coal blending amount pelletizing and high coal blending amount pelletizing, made pelletizing adopts top layer for high coal blending amount pelletizing, bottom
It is distributed in rotary hearth furnace for low coal blending amount pelletizing layer-by-layer distribution mode, 850 DEG C of preheating zone temperature, 20 minutes time, reduction temperature
1350 DEG C, 20 minutes time, the annulus angle of preheating zone is 100 °, and rotary hearth furnace preheating zone arranges gas recovery system for oil, Ke Yiyou
Effect reclaims coal gas produced by pyrolysis of coal and coal tar in heating process, in stove phosphorus ore there is reduction, produced by after oxidation reaction
Containing P2O5Flue gas finally gives the phosphoric acid product of acid concentration 89% Jing after flue discharge after purified, aquation, discharge from discharge gate
High temperature furnace slag can use as combustion air after air heat-exchanging device preheated air, the slag after cooling can be used as cement
Raw materials for production.
Inventor has found, according to the system of this utility model embodiment, pelletizing need not be dried drying and can directly enter stove and subtract
Few equipment investment, sets up drying tube preheating zone in rotary hearth furnace, efficiently solve material and enter the stove initial stage because causing burner to block up powder more
The problem of plug；And the flow processing raw material of rotary hearth furnace is directly entered using wet bulb, technological process is shortened, equipment throwing is reduced
Money, production cost and energy consumption；This utility model realizes that Phosphate ore reduction, oxidation reaction are carried out in same stove simultaneously, aoxidizes
Institute's calorific requirement in the radiation-curable supply reduction process of heat that reaction is produced, effectively reduces extraneous supply energy consumption, reduces production energy
Consumption；Additionally, this utility model is using low grade rock phosphate and briquet replacing coke can adopt the colm of low fixed carbon, high volatile to make
For raw material, Phosphate ore reduction rate height, using the phosphorus ore of middle-low grade, widen raw material and utilize condition, while enriching product category, carry
High added value of product, and layer-by-layer distribution is adopted, material area reducing atmosphere is ensured, fabric thickness in stove is improved, can be effective
Utilization rate of equipment and installations is improved, and production capacity is greatly improved on the premise of guarantee product index is qualified, 2-4 is improved than traditional method production capacity
Times；And regenerative combustion technology is adopted, fuel cost can be reduced using inferior or low-rank fuel, can be at home and scarce
The area popularization of few natural gas and high-grade fuel.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " illustrative examples ",
The description of " example ", " specific example " or " some examples " etc. means specific features, the knot described with reference to the embodiment or example
Structure, material or feature are contained at least one embodiment of the present utility model or example.In this manual, to above-mentioned art
The schematic representation of language is not necessarily referring to identical embodiment or example.And, the specific features of description, structure, material or
Person's feature can be combined in one or more any embodiment or example in an appropriate manner.
In description of the present utility model, it is to be understood that term " first ", " second " are only used for describing purpose, and
It is not intended that indicating or implying relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define
The feature of " first ", " second " can be expressed or implicitly include one or more this feature.Of the present utility model
In description, unless otherwise stated, " multiple " are meant that two or more.
In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " peace
Dress ", " being connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integratedly
Connection；Can be mechanically connected, or put connection；Can be joined directly together, it is also possible to be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in this utility model.
Although embodiment of the present utility model has been shown and described above, it is to be understood that above-described embodiment is
Exemplary, it is impossible to it is interpreted as to restriction of the present utility model, one of ordinary skill in the art is in scope of the present utility model
It is interior above-described embodiment to be changed, be changed, being replaced and modification, simultaneously for one of ordinary skill in the art, foundation
The thought of the application, will change in specific embodiments and applications.
Claims (3)
1. a kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system, it is characterised in that including material processing device, preheating, reduce and
Oxidation unit, dust arrester and hydrating apparatus, wherein：
The material processing device, is made up of the breaker, screening plant, mixing arrangement and the ball-making device that are sequentially connected；Institute
State material processing device and there is the outlet of ground phosphate rock entrance, reduction coal entrance, Silicon stone entrance, binding agent entrance and mixed material, use
In by ground phosphate rock, reduction coal, Silicon stone and binding agent, Jing after broken, screening, dispensing mixes and suppress balling-up, made pelletizing in proportion
It is divided into low coal blending amount pelletizing and high coal blending amount pelletizing；
The preheating, reduction and oxidation unit are improved rotary hearth furnace, including：Adjacent feed zone, drying tube preheating successively
Area, burner on sidewall reducing zone, furnace roof zoneofoxidation and discharge zone, wherein, the drying tube preheating zone is reduced with the burner on sidewall
Partition wall is provided between area, barricade between the burner on sidewall reducing zone and the discharge zone, is provided with, the partition wall and barricade by
The roof of the rotary hearth furnace is extended downwardly, and keeps certain intervals with the cloth ring-shaped furnace bottom of the rotary hearth furnace；Wherein, it is described dry
Dry pipe is arranged on the furnace wall side wall of the drying tube preheating zone, for heating to the drying tube preheating zone；The side
Wall burner reducing zone is provided with multiple burners on the inside of furnace wall, for carrying out burner mode heating to the burner on sidewall reducing zone；Institute
State feed zone furnace wall and be provided with mixed material entrance, the discharge zone is provided with slag outlet, on the furnace wall of the drying tube preheating zone
It is provided with containing P2O5Exhanst gas outlet and pyrolysis gas outlet, the mixed material entrance are gone out with the mixed material of the material processing device
Mouth is connected, for being distributed into mixed material successively in rotary hearth furnace after preheated, reduction reaction, oxidation reaction to obtain containing P2O5
Flue gas；
The rotary hearth furnace feeding system arranges high coal blending amount pelletizing feed bin and low coal blending amount pelletizing feed bin, the high coal blending amount pelletizing
Feed bin supplies top layer cloth pelletizing in stove by feeding-distribution device, and low coal blending amount pelletizing feed bin supplies bottom in stove by feeding-distribution device
Cloth pelletizing, so that cloth is layer-by-layer distribution mode in stove, top layer is high coal blending amount pelletizing, and bottom is low coal blending amount ball
Group；
The dust arrester includes：Containing P2O5Smoke inlet, containing P2O5Clean gas outlet and dust outlet, it is described containing P2O5Flue gas enters
Mouth is with the preheating, reduction and oxidation unit containing P2O5Exhanst gas outlet is connected, for containing P2O5Dust arrester described in flue gas Jing
After process, obtain containing P2O5Purified gas；
The hydrating apparatus include：Containing P2O5Purified gas entrance, phosphoric acid outlet, it is described containing P2O5Purified gas entrance is filled with the dedusting
Put containing P2O5Clean gas outlet is connected, for containing P2O5Purified gas obtain phosphoric acid Jing after aquation absorption.
2. system according to claim 1, it is characterised in that set up pyrolysis in preheating, reduction and oxidation unit preheating zone
Flash Gas Compression Skid System, the pyrolysis Flash Gas Compression Skid System include the pyrolysis gas clean unit being sequentially connected, Oil-gas Separation unit, cool down list
Unit, with pyrolysis gas entrance and coal gas, tar outlet, the pyrolysis gas outlet of the preheating zone and the pyrolysis Flash Gas Compression Skid System
Pyrolysis gas entrance is connected.
3. system according to claim 1, it is characterised in that the horizontal cross-section of the preheating, reduction and oxidation unit is
Annular, the drying tube preheating zone annulus angle is 30 ° -100 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201621051645.9U CN206069374U (en) | 2016-09-13 | 2016-09-13 | A kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621051645.9U CN206069374U (en) | 2016-09-13 | 2016-09-13 | A kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106241760A (en) * | 2016-09-13 | 2016-12-21 | 江苏省冶金设计院有限公司 | A kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system and method |
| CN107904345A (en) * | 2017-11-15 | 2018-04-13 | 江苏省冶金设计院有限公司 | A kind of method for realizing the reduction of rotary hearth furnace deep bed sintering |
-
2016
- 2016-09-13 CN CN201621051645.9U patent/CN206069374U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106241760A (en) * | 2016-09-13 | 2016-12-21 | 江苏省冶金设计院有限公司 | A kind of wet bulb bilayer pyrolysis-type phosphoric acid preparation system and method |
| CN107904345A (en) * | 2017-11-15 | 2018-04-13 | 江苏省冶金设计院有限公司 | A kind of method for realizing the reduction of rotary hearth furnace deep bed sintering |
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