CN104529559A - Device and method for increasing nitrogen content of diammonium phosphate by virtue of dual-tube reverse production process by adding urea - Google Patents
Device and method for increasing nitrogen content of diammonium phosphate by virtue of dual-tube reverse production process by adding urea Download PDFInfo
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- CN104529559A CN104529559A CN201410815999.5A CN201410815999A CN104529559A CN 104529559 A CN104529559 A CN 104529559A CN 201410815999 A CN201410815999 A CN 201410815999A CN 104529559 A CN104529559 A CN 104529559A
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- urea
- diammonium phosphate
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05B—PHOSPHATIC FERTILISERS
- C05B7/00—Fertilisers based essentially on alkali or ammonium orthophosphates
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Abstract
The invention discloses a mevice and a method for increasing nitrogen content of diammonium phosphate by virtue of dual-tube reverse production process by adding urea. The device comprises a urea adding device, a concentrated phosphoric acid clarifying tank, a tubular reactor (17a), a tubular reactor (17b), a tubular reverse acid preparation tank (31), a pelletizer (1), a drying machine (2), a dried material belt (3), a dried material bucket elevator (4), large-grain sieving machines 5 (5a, 5b, 5c, 5d and 5e), grinding machines 6 (6a, 6b and 6c), a cooling fluidized bed (10), a packaging cylinder (13), a cyclone separator, a dust-collecting fan and a tail gas washing system. According to the specific method utilizing the device, a diammonium phosphate product can be prepared from phosphoric acid which is prepared concentrating normal wet process phosphoric acid, the mass fraction of nitrogen in the diammonium phosphate product reaches above 18%, and the diammonium phosphate product meets the requirements of international markets; a way for exploiting international markets for enterprises is found, and the sales market is expanded.
Description
Technical field
the present invention relates to phosphatic compound fertilizer technology, be specifically related to a kind of urea that adds and adopt two-tube anti-production technique to improve the device and method of diammonium phosphate nitrogen content
.
Background technology
There is the product problem that nitrogen content is on the low side in current industrial phosphoric acid two ammonium.The phosphoric acid being used as raw material obtained through wet-process phosphoric acid concentration is because being subject to the impact of solid content, sesquioxide etc., and in the diammonium phosphate product produced, nitrogen content does not reach more than 18%, does not meet the standard-required of foreign market.Current employing tubular reactor adds tubular reactor (being called for short two-tube anti-) production technique, and product diammonium phosphate is because of the impact by impurity, and its N content is also difficult to reach more than 18%.Requirement method does not need to process urea
Need to provide a kind of method improving nitrogen content of diammonium phosphate product for this reason, thus develop the diversification product with market competition advantage.This method mode of production as compared with the past, directly can add production system, decreases labour cost and the energy consumption of secondary treatment, effectively can reduce production cost.Solve the problem
.
Summary of the invention
Object of the present invention has invented the Apparatus and method for that a kind of interpolation urea improves diammonium phosphate nitrogen content, the phosphoric acid being used as raw material that normal wet Phosphoric Acid Concentration can be utilized to obtain, in obtained diammonium phosphate product the massfraction of nitrogen reach more than 18%, the product that meets world market needs, find a road for exploring world market.
Utilize two-tube anti-technique, the production technique of tubular reactor is added with tubular reactor, be called for short two-tube anti-production technique, by adding the device of urea production height nitrogen diammonium phosphate, this equipment configuration comprises urea adding set, strong phosphoric acid clarifying tank, tubular reactor 17a, tubular reactor 17b, manage anti-complex acid groove 31, tablets press 1, drying machine 2, dried material conveyor 3, dried material bucket elevator 4, the large grain sieve apparatus of large grain sieve apparatus 5(5 platform is respectively 5a, 5b, 5c, 5d, 5e), 3 crusher 6(3 platform crushers are respectively 6a, 6b, 6c), cooling bed 10, parcel cylinder 13, cyclonic separator, dust collecting fan, vent gas washing system.
described urea adding set comprises disk feeder, feeding belt 15, feed bucket elevator 14, and belt is connected with bucket elevator import, and feed bucket elevator 14 exit chute is connected with the import of system returning charge bucket elevator 16.
Described tubular reactor 17a, tubular reactor 17b are contained in tablets press; afterbody is provided with acid, ammonia mixing head; transport pipe and the liquefied ammonia pipeline of managing anti-complex acid groove 31 enter in vertical manner at each mixing head place respectively, and managing that anti-front end is equipped with can the spout of adjusting size.
Described tablets press 1 is rotary drum granulator; inside is provided with prilling granulator and preventing materials accumulation device; prilling granulator comprises ammonia sparger, 4 ploughshares are arranged on tablets press crossbeam according to certain angle, and jumps parallel with tablets press, is separately fixed on ploughshare by ammonia sparger liquid ammonia tube.
Described drying machine 2 is for rotating and fluidized drying machine, and product material is together with the high-temperature flue gas from hotblast stove and stream carries out drying, and dryer inner is provided with the flight of different size, material can be taken up and form material curtain, to reach drying effect better.
Described drying machine afterbody is connected with dried material belt 3 and dried material bucket elevator 4, and dried material bucket elevator 4 outlet is connected with 5 large grain sieve apparatus (large grain sieve apparatus 5a, large grain sieve apparatus 5b, large grain sieve apparatus 5c, large grain sieve apparatus 5d, large grain sieve apparatus 5e).
Described great Li sieve apparatus lower floor is connected with chute and enters product bucket elevator 8, and product bucket elevator 8 outlet is connected with 2 product sieve apparatus (9a, 9b); Large grain sieve apparatus upper materials is connected with chute and enters immediately below crusher (6a, 6b, 6c) crusher and be provided with return collecting belt 7, and collect belt and be connected with returning charge bucket elevator 16 import by chute, returning charge bucket elevator 16 exit chute is connected with tablets press.
Described product sieve apparatus lower floor material is connected with return collecting belt 7 by chute, and upper strata is connected with chute and enters cooling bed 10, is provided with cooling air blower below this fluidized-bed, and top is provided with cooling and dedusting blower fan.Guarantee that material carries out fluidisation cooling in fluidized-bed by regulating gas blower and cooling fan flow size.
Described fluidized-bed 10 exports and connects product bucket elevator 11, and bucket elevator 11 outlet is connected to two fine work sieve apparatus (12a, 12b), and fine work sieve apparatus lower floor is connected with two and collects belt, and this belt is connected with return collecting belt 7 by chute; Upper strata is connected with parcel cylinder 13 by chute.
Described parcel cylinder is connected with the oily adding set of parcel, and parcel oil enters parcel cylinder by pipeline, fully mixes, wrap up product with material, and the product wrapped is transported to loose storehouse by belt and stacks packaging.
Described cyclonic separator comprises dried tail gas dedusting cyclonic separator, cooling and dedusting cyclonic separator, system respectively gather dust a dedusting cyclonic separator, and each separator is provided with trace pipe, inside is provided with preventing materials accumulation, scab chain, and bottom is provided with air valve; Separator outlet pipeline is connected with blower fan.
Described washing system comprises reaction/tail gas generated by granulation washing device, it is characterized in that there is ammonia scrubber 18, ammonia scrubber wash pools groove 19, tail gas washing tower 20, washing tail gas wash pools groove 21, tail gas generated by granulation blower fan 28.
Described washing system comprises dried tail gas washing device, it is characterized in that there is dry washing tower 22, dry washing tower wash pools groove 23, tail gas washing tower 24, washing tail gas wash pools groove 25.
Described washing system comprises cooling and dedusting washing device, it is characterized in that there is cooling and dedusting washing tower 26, cooling/dedusting washing wash pools groove 27.
Described washing system is furnished with washing lotion transferpump, each washer, washing tower by airduct be connected, washing system tail end is chimney 30, the gas up to standard washed by chimney discharged in air.
Utilize said apparatus, adopting two-tube anti-technique by adding the production method of urea production height nitrogen diammonium phosphate, it is characterized in that comprising the following steps:
(1) Operational preparation
The strong phosphoric acid that Wet Phosphoric Acid Plant is produced is delivered to phosphoric acid storage tank for subsequent use;
The urea product of outsourcing is stacked to designated area, is convenient to add;
(2) production control
From the strong phosphoric acid (P of phosphoric acid storage tank
2o
5content 46.5%) flow 95% switch enter ammonia scrubber 18 circulation cleaning tail gas generated by granulation, enter ammonia scrubber wash pools groove 19, mix with from the washings in pond for recovering, under agitator effect, keep mixing, density domination 1.50 g/cm
3-1.60g/cm
3, by pump, mixed solution is delivered to the anti-complex acid groove (31) of pipe, holding tube anti-complex acid groove Liquid level is at 50%-65%; Another part flow 5% switches to enter manages anti-complex acid groove 31, controls tubular reactor (17a, 17b) complex acid density 1.55 g/cm
3-1.65 g/cm
3.
Start tubular reactor (17a), tubular reactor (17b) whitewashing runs; tubular reactor degree of neutralization (N/P) is set between 1.55-1.75; degree of neutralization (N/P) set(ting)value is according to divine force that created the universe material condition selecting; in tablets press, add ammonia simultaneously carry out secondary benefit ammonia, the whitewashing amount of two tubular reactors reaches 45 g/cm
3-60m
3/ h, by video monitoring and the dry wet situation of field observation tablets press 1 outlet material, dynamic adjustments secondary mends ammonia amount, to keep tablets press outlet material to be granular dispersion state, ensures that tablets press outlet material degree of neutralization is about 1.9 simultaneously.
Start urea add-on system, manually add ready urea product to feed bin, the quality Y of urea is calculated as follows:
(a×X+46%×Y)/(X+Y)=18%
Y＝(18%-a) ×X/(46%-18%)，
(wherein a is original product nitrogen content, and X is output hourly, and Y is urea add-on, and 46% is urea nitrogen content; ) master control is according to calculating gained urea quality, start disk feeder, quantitatively in system, add urea product, site operation personnel should be noted and observes and ensure that in feed bin, urea is made adequate preparation.
The urea added enters tablets press with system returning charge; as granulation masterbatch, the high temperature slip sprayed with tubular reactor, by coating, bonding, completes granulation from granulating mode; urea then enters into diammonium phosphate product inside, in order to complete the increase of nitrogen content.
Granulation material leaves tablets press 1, enters rotary dryer 2, carries out and fluidized drying with the high-temperature flue gas from hotblast stove, and drying machine is tiny structure under the effect of dried tail gas blower fan 29.
Material through super-dry passes through the conveying of dried material belt 3, dried material bucket elevator 4; under the effect of material distributing valve; be dispensed to five large grain sieve apparatus (5a, 5b, 5c, 5d, 5e) uniformly; large grain sieve apparatus upper materials enters after crusher (6a, 6b, 6c) carries out fragmentation; collected by return collecting belt 7; carry through returning charge bucket elevator 16 subsequently, enter tablets press and carry out granulation again together with the urea added.Under sieve apparatus, layered material enters into two finished product screen extension sets (9a, 9b) through bucket elevator 8 and transporting chute.
The minus mesh of finished product screen extension set then enters into return collecting belt 7, returns tablets press granulation again; Upper materials enters into cooling bed 10 as diammonium phosphate product, cool through air blast, to be promoted by product bucket elevator 11 and sub-material enters two product sieve apparatus (12a, 12b) and again carries out stricter screening, further preferred product, guarantee that product granularity is even; The product introduction parcel cylinder 13 pairs of products filtered out add parcel oil and carry out external parcel, prevent product from storage transportation, occurring the phenomenons such as caking, the moisture absorption.The product wrapped is packed to storehouse in bulk storage through Belt Conveying.
In aforesaid method, the specification of urea sees the following form:
| Nitrogen content (massfraction) % | Biuret Content/% | Iron (Fe) content/% | Basicity (in NH3)/% | Insolubles content/% in water | Moisture/% |
| ≥46 | ≤0.50 | ≤0.0005 | ≤0.015 | ≤0.01 | ≤0.5 |
In aforesaid method, the slip pipe of tubular reactor (17a, 17b) is arranged two spouts, spout outside is added with nozzle, can by regulating the size of the position control spout of nozzle.
In aforesaid method, tablets press 1 ancient piece of jade, round, flat and with a hole in its centre has ventilation breather, liner offset plate, air promotes the material on offset plate by turnover ventilation breather, prevent materials from bonding on offset plate; Also be provided with preventing materials accumulation device in tablets press inside, avoid material to pile up at tablets press inside caking, keep tablets press cleaning inside.
In aforesaid method, drying machine 2 gas inlet temperature 450 DEG C-750 DEG C, Outlet Gas Temperature 82 DEG C-100 DEG C, can ensure drying machine outlet material moisture≤2.0%.
In aforesaid method, large grain sieve apparatus (5a, 5b, 5c, 5d, 5e) for individual layer be vibratory screening apparatus, mesh size 4.2 × 4.2mm, described finished product screen (9A, 9B) screen cloth is strip-type screen, aperture 3.0 × 30mm.
In aforesaid method, described crusher is double-shaft chain hammer mill, turns to contrary.
In aforesaid method, the tail gas of all generations, under the effect of blower fan, enters washing system, and has wash pools groove collection washing lotion to carry out circulation cleaning; Washing system adopts the washings of lower concentration to carry out circulated sprinkling washing to each washing tower, add certain process water to dilute simultaneously, keep concentration and the washing effect of washings, washings is all recycled to washings and reclaims as system water supplement, and tail gas is then discharged by chimney through blower fan draw.
Accompanying drawing explanation
Fig. 1 adds urea and adopts two-tube anti-production technique to improve the device technique flow path device structural representation of diammonium phosphate nitrogen content.
In Fig. 1, wherein 1. tablets presss, 2. drying machine, 3. dried material belt, 4. dried material bucket elevator, 5. large sieve apparatus (5a, 5b, 5c, 5d, 5e), 6. tubular reactor crusher (6a, 6b, 6c), 7. return collecting belt, 8. material bucket elevator, 9. product sieve apparatus (9a, 9b), 10. cooling bed, 11. product bucket elevators, 12. fine work sieve apparatus (12a, 12b), 13. parcel cylinders, 14, (urea) feed bucket elevator, 15.(urea) feeding belt, 16. system returning charge bucket elevators, 17a. tubular reactor, 17b. tubular reactor, 18. ammonia scrubbers, 19. ammonia scrubber wash pools grooves, 20. tail gas washing towers, 21. washing tail gas receiving tanks, 22. dried tail gas washing towers, 23. dried tail gas washing wash pools grooves, 24. tail gas washing towers, 25. washing tail gas wash pools grooves, 26. cooling and dedusting tail gas washing towers, 27. cooling and dedusting washing tail gas wash pools grooves, 28. tail gas generated by granulation blower fans, 29. dried tail gas blower fans, 30. chimneys, the anti-complex acid groove of 31 pipe.
Embodiment
embodiment 1
Now the present invention will be further described by reference to the accompanying drawings: this example this only represent it is a specific embodiment, be not limitation of the scope of the invention.
certain features of DAP production device utilizes two-tube anti-technique by adding the equipment of urea production height nitrogen diammonium phosphate, this equipment comprises urea adding set, strong phosphoric acid clarifying tank, manages anti-complex acid groove 31, tubular reactor (17a, 17b), tablets press 1, drying machine 2, dried material conveyor, dried material bucket elevator, sieve apparatus, crusher 6, cooling bed 10, parcel cylinder 13, cyclonic separator, dust collecting fan, vent gas washing system.
described urea adding set comprises disk feeder, feeding belt 15, feed bucket elevator 14, and belt is connected with bucket elevator import, and feed bucket elevator 14 exit chute is connected with the import of system returning charge bucket elevator 16.
described tubular reactor (17a, 17b) is contained in tablets press; afterbody is provided with acid, ammonia mixing head; transport pipe and the liquefied ammonia pipeline of managing anti-complex acid groove 31 enter in vertical manner at each mixing head place respectively, and managing that anti-front end is equipped with can the spout of adjusting size.
described tablets press 1 is rotary drum granulator; inside is provided with prilling granulator and preventing materials accumulation device; prilling granulator comprises ammonia sparger, 4 ploughshares are arranged on tablets press crossbeam according to certain angle, and jumps parallel with tablets press, is separately fixed on ploughshare by ammonia sparger liquid ammonia tube.
described drying machine 2 is for rotating and fluidized drying machine, and product material is together with the high-temperature flue gas from hotblast stove and stream carries out drying, and dryer inner is provided with the flight of different size, material can be taken up and form material curtain, to reach drying effect better.
described drying machine afterbody is connected with dried material belt 3 and dried material bucket elevator 4, and dried material bucket elevator 4 outlet is connected with 5 large grain sieve apparatus (5a, 5b, 5c, 5d, 5e).
described great Li sieve apparatus lower floor is connected with chute and enters product bucket elevator 8, and product bucket elevator 8 outlet is connected with 2 product sieve apparatus (9a, 9b).Large grain sieve apparatus upper materials is connected with chute and enters immediately below crusher (6a, 6b, 6c) crusher and be provided with return collecting belt 7, and return collecting belt is connected with returning charge bucket elevator 16 import by chute, and returning charge bucket elevator 16 exit chute is connected with tablets press.
described product sieve apparatus lower floor material is connected with return collecting belt 7 by chute, and upper strata is connected with chute and enters cooling bed 10, is provided with cooling air blower below this fluidized-bed, and top is provided with cooling and dedusting blower fan.Guarantee that material carries out fluidisation cooling in fluidized-bed by regulating gas blower and cooling fan flow size.
described fluidized-bed 10 exports and connects product bucket elevator 11, and product bucket elevator 11 outlet is connected to two fine work sieve apparatus (12a, 12b), and fine work sieve apparatus lower floor is connected with two and collects belt, and this belt is connected with return collecting belt 7 by chute; Upper strata is connected with parcel cylinder 13 by chute.
described parcel cylinder is connected with the oily adding set of parcel, and parcel oil enters parcel cylinder by pipeline, fully mixes, wrap up product with material, and the product wrapped is transported to loose storehouse by belt and stacks packaging.
described cyclonic separator comprises dried tail gas dedusting cyclonic separator, cooling and dedusting cyclonic separator, system respectively gather dust a dedusting cyclonic separator, and each separator is provided with trace pipe, inside is provided with preventing materials accumulation, scab chain, and bottom is provided with air valve; Separator outlet pipeline is connected with blower fan.
described washing system comprises reaction/tail gas generated by granulation washing device, it is characterized in that there is ammonia scrubber 18, ammonia scrubber wash pools groove 19, tail gas washing tower 20, washing tail gas wash pools groove 21, tail gas generated by granulation blower fan 28.
described washing system comprises dried tail gas washing device, it is characterized in that there is dry washing tower 20, dry washing tower wash pools groove 21, tail gas washing tower 22, washing tail gas wash pools groove 23.
described washing system comprises cooling and dedusting washing device, it is characterized in that there is cooling and dedusting washing tower 26, cooling/dedusting washing wash pools groove 27.
described washing system is furnished with washing lotion transferpump, each washer, washing tower by airduct be connected, washing system tail end is chimney (30), the acceptable gas washed by chimney discharged in air.
utilizing two-tube anti-technique to improve the production method of nitrogen in diammonium phosphate by adding urea production, it is characterized in that comprising the following steps:
(1) Operational preparation
the strong phosphoric acid that Wet Phosphoric Acid Plant is produced is delivered to phosphoric acid storage tank for subsequent use
the urea product of outsourcing is stacked to designated area, is convenient to add
(2) production control
from the strong phosphoric acid (P of phosphoric acid storage tank
2
o
5
content 46.5%) flow 95% switch enter ammonia scrubber 18 circulation cleaning tail gas generated by granulation, enter ammonia scrubber wash pools groove 19, mix with from the washings in pond for recovering, under agitator effect, keep mixing, density domination 1.50-1.60g/cm
3
, by pump, mixed solution is delivered to the anti-complex acid groove 31 of pipe, holding tube anti-complex acid groove Liquid level is at 50%-65%; Another part flow 5% switches to enter manages anti-complex acid groove 31, controls tubular reactor complex acid density 1.55 g/cm
3
-1.65 g/cm
3
.
start tubular reactor (17a, 17b) whitewashing to run; tubular reactor degree of neutralization (N/P) is set between 1.55-1.75; degree of neutralization (N/P) set(ting)value is according to divine force that created the universe material condition selecting, and in tablets press, add secondary simultaneously mend ammonia, the whitewashing amount of two tubular reactors reaches 45 m
3
/ h-60m
3
/ h, by video monitoring and the dry wet situation of field observation tablets press (1) outlet material, dynamic adjustments secondary mends ammonia amount, to keep tablets press outlet material to be granular dispersion state, ensures that tablets press outlet material degree of neutralization is about 1.9 simultaneously.
start urea add-on system, manually add ready urea product to feed bin, the quality Y of urea is calculated as follows:
(a×X+46%×Y)/(X+Y)=18%
Y＝(18%-a)×X/(46%-18%)，
(wherein a is original product nitrogen content, and X is output hourly, and Y is urea add-on, and 46% is urea nitrogen content.) master control is according to calculating gained urea quality startup disk feeder, quantitatively in system, add urea product, site operation personnel should be noted and observes and ensure that in feed bin, urea is made adequate preparation.
the urea added enters tablets press with system returning charge; as granulation masterbatch, the high temperature slip sprayed with tubular reactor, by coating, bonding, completes granulation from granulating mode; urea then enters into diammonium phosphate product inside, in order to complete the increase of nitrogen content.
granulation material leaves tablets press 1, enters rotary dryer 2, carries out and fluidized drying with the high-temperature flue gas from hotblast stove, and drying machine is tiny structure under the effect of dried tail gas blower fan 29.
material through super-dry passes through the conveying of belt 3, bucket elevator 4; under the effect of material distributing valve; be dispensed to five large grain sieve apparatus (5a, 5b, 5c, 5d, 5e) uniformly; large grain sieve apparatus upper materials enters after crusher (6a, 6b, 6c) carries out fragmentation; collected by return collecting belt 7; carry through returning charge bucket elevator 16 subsequently, enter tablets press and carry out granulation again together with the urea added.Under sieve apparatus, layered material enters into two finished product screen extension sets (9a, 9b) through bucket elevator 8 and transporting chute.
the minus mesh of finished product screen extension set then enters into return collecting belt 7, returns tablets press granulation again; Upper materials enters into cooling bed 10 as diammonium phosphate product, cool through air blast, to be promoted by product bucket elevator 11 and sub-material enters two product sieve apparatus (12a, 12b) and again carries out stricter screening, further preferred product, guarantee that product granularity is even.The product introduction parcel cylinder 3 pairs of products filtered out add parcel oil and carry out external parcel, prevent product from storage transportation, occurring the phenomenons such as caking, the moisture absorption.The product wrapped is packed to storehouse in bulk storage through Belt Conveying.
in aforesaid method, the specification of urea sees the following form:
| Nitrogen content (massfraction) % | Biuret Content/% | Iron (Fe) content/% | Basicity (in NH3)/% | Insolubles content/% in water | Moisture/% |
| ≥46 | ≤0.50 | ≤0.0005 | ≤0.015 | ≤0.01 | ≤0.5 |
in aforesaid method, the slip pipe of tubular reactor (17a, 17b) is arranged two spouts, spout outside is added with nozzle, can by regulating the size of the position control spout of nozzle.
in aforesaid method, tablets press 1 wall has ventilation breather, liner offset plate, air promotes the material on offset plate by turnover ventilation breather, prevent materials from bonding on offset plate; Also be provided with preventing materials accumulation device in tablets press inside, avoid material to pile up at tablets press inside caking, keep tablets press cleaning inside.
aforesaid method, drying machine 2 gas inlet temperature 450 DEG C-750 DEG C, Outlet Gas Temperature 82 DEG C-100 DEG C, can ensure drying machine outlet material moisture≤2.0%.
in aforesaid method, large grain sieve apparatus (5a, 5b, 5c, 5d, 5e) for individual layer be vibratory screening apparatus, mesh size 4.2 × 4.2mm, described finished product screen (9A, 9B) screen cloth is strip-type screen, aperture 3.0 mm × 30mm.
in aforesaid method, described crusher is double-shaft chain hammer mill, turns to contrary.
aforesaid method, the tail gas of all generations, under the effect of blower fan, enters washing system, and has wash pools groove collection washing lotion to carry out circulation cleaning; Washing system adopts the washings of lower concentration to carry out circulated sprinkling washing to each washing tower, add certain process water to dilute simultaneously, keep concentration and the washing effect of washings, washings is all recycled to washings and reclaims as system water supplement, and qualified tail gas is then discharged by chimney 30 through blower fan draw.
subordinate list 1:
Claims (18)
1. one kind is added the method that urea adopts two-tube anti-production technique raising diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve this device of the method for diammonium phosphate nitrogen content for adding urea, comprise urea adding set, strong phosphoric acid clarifying tank, tubular reactor (17a), tubular reactor (17b), manage anti-complex acid groove (31), tablets press (1), drying machine (2), dried material conveyor (3), dried material bucket elevator (4), large grain sieve apparatus 5(5a, 5b, 5c, 5d, 5e), crusher 6(6a, 6b, 6c), cooling bed (10), parcel cylinder (13), cyclonic separator, dust collecting fan, vent gas washing system, implement to adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content for adding urea in this set of device.
2. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, urea adding set in this device comprises disk feeder, feeding belt (15), feed bucket elevator (14), belt is connected with bucket elevator import, and feed bucket elevator (14) exit chute is connected with system returning charge bucket elevator (16) import.
3. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content; it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea; tubular reactor (17a) in this device, tubular reactor (17b) are contained in tablets press; afterbody is provided with acid, ammonia mixing head; transport pipe and the liquefied ammonia pipeline of managing anti-complex acid groove (31) enter in vertical manner at each mixing head place respectively, and managing that anti-front end is equipped with can the spout of adjusting size.
4. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content; it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea; tablets press described in this device (1) is rotary drum granulator; inside is provided with prilling granulator and preventing materials accumulation device; prilling granulator comprises ammonia sparger, 4 ploughshares are arranged on tablets press crossbeam according to certain angle; and jump parallel with tablets press, ammonia sparger liquid ammonia tube is separately fixed on ploughshare.
5. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, drying machine described in this device (2) is for rotating and fluidized drying machine, product material is together with the high-temperature flue gas from hotblast stove and stream carries out drying, dryer inner is provided with the flight of different size, material can be taken up and form material curtain, to reach drying effect better.
6. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, drying machine afterbody described in this device is connected with dried material belt (3) and dried material bucket elevator (4), dried material bucket elevator (4) outlet is connected with 5 large grain sieve apparatus (5a, 5b, 5c, 5d, 5e).
7. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content; it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea; the lower floor of great Li sieve apparatus described in this device is connected with chute and enters product bucket elevator (8), and product bucket elevator (8) outlet is connected with 2 product sieve apparatus (9a, 9b); Large grain sieve apparatus upper materials is connected with chute and enters immediately below crusher (6a, 6b, 6c) crusher and be provided with return collecting belt (7); collect belt to be connected with returning charge bucket elevator (16) import by chute, returning charge bucket elevator (16) exit chute is connected with tablets press.
8. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, the lower floor of product sieve apparatus described in this device material is connected with return collecting belt (7) by chute, upper strata is connected with chute and enters cooling bed (10), be provided with cooling air blower below this fluidized-bed, top is provided with cooling and dedusting blower fan; Guarantee that material carries out fluidisation cooling in fluidized-bed by regulating gas blower and cooling fan flow size.
9. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, fluidized-bed described in this device (10) outlet connects product bucket elevator (11), bucket elevator (11) outlet is connected to two fine work sieve apparatus (12a, 12b), fine work sieve apparatus lower floor is connected with two and collects belt, and this belt is connected with return collecting belt (7) by chute; Upper strata is connected with parcel cylinder (13) by chute.
10. a kind of urea that adds according to claim 1 adopts two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, wrap up cylinder (13) described in this device and be connected with the oily adding set of parcel, parcel oil enters parcel cylinder by pipeline, fully mix with material, wrap up product, the product wrapped is transported to loose storehouse by belt and stacks packaging.
11. a kind of urea that add according to claim 1 adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, cyclonic separator described in this device comprises dried tail gas dedusting cyclonic separator, cooling and dedusting cyclonic separator, system respectively gather dust a dedusting cyclonic separator, each separator is provided with trace pipe, inside is provided with preventing materials accumulation, scab chain, and bottom is provided with air valve; Separator outlet pipeline is connected with blower fan.
12. a kind of urea that add according to claim 1 adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, washing system described in this device comprises reaction/tail gas generated by granulation washing device, it is characterized in that there is ammonia scrubber (18), ammonia scrubber wash pools groove (19), tail gas washing tower (20), washing tail gas wash pools groove (21), tail gas generated by granulation blower fan (28).
13. a kind of urea that add according to claim 1 adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, described in this device, washing system comprises dried tail gas washing device, it is characterized in that there is dry washing tower (22), dry washing tower wash pools groove (23), tail gas washing tower (24), washing tail gas wash pools groove (25).
14. a kind of urea that add according to claim 1 adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, described in this device, washing system comprises cooling and dedusting washing device, it is characterized in that there is cooling and dedusting washing tower (26), cooling/dedusting washing wash pools groove (27).
15. a kind of urea that add according to claim 1 adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the device of the method for diammonium phosphate nitrogen content for adding urea, described in this device, washing system is furnished with washing lotion transferpump, each washer, washing tower are connected by airduct, washing system tail end is chimney (30), the gas up to standard washed by chimney discharged in air.
16. a kind of urea that add according to claim 1 adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that adopting two-tube anti-production technique to improve the method for the device of diammonium phosphate nitrogen content with adding urea, it comprises the following steps:
(1) Operational preparation
The strong phosphoric acid that Wet Phosphoric Acid Plant is produced is delivered to phosphoric acid storage tank for subsequent use, the urea product of outsourcing is stacked to designated area, be convenient to add;
(2) production control
From the strong phosphoric acid (P of phosphoric acid storage tank
2o
5content 46.5%) flow 95% switch enter ammonia scrubber (18) circulation cleaning tail gas generated by granulation, enter ammonia scrubber wash pools groove (19), mix with from the washings in pond for recovering, under agitator effect, keep mixing, density domination 1.50 g/cm
3-1.60g/cm
3, by pump, mixed solution is delivered to the anti-complex acid groove (31) of pipe, holding tube anti-complex acid groove Liquid level is at 50%-65%; Another part flow 5% switches to enter manages anti-complex acid groove (31), controls tubular reactor complex acid density 1.55 g/cm
3-1.65 g/cm
3;
Start tubular reactor (17a, 17b) whitewashing to run; tubular reactor degree of neutralization (N/P) is set between 1.55-1.75; degree of neutralization (N/P) set(ting)value is according to divine force that created the universe material condition selecting, and in tablets press, add secondary simultaneously mend ammonia, the whitewashing amount of two tubular reactors reaches 45-60m
3/ h, by video monitoring and the dry wet situation of field observation tablets press (1) outlet material, dynamic adjustments secondary mends ammonia amount, to keep tablets press outlet material to be granular dispersion state, ensures that tablets press outlet material degree of neutralization is about 1.9 simultaneously;
Start urea add-on system, manually add ready urea product to feed bin, the quality Y of urea is calculated as follows:
(a×X+46%×Y)/(X+Y)=18%
Y＝(18%-a) ×X/(46%-18%)，
(wherein a is original product nitrogen content, and X is output hourly, and Y is urea add-on, and 46% is urea nitrogen content; )
Master control starts disk feeder according to calculating gained urea quality, and quantitatively in system, add urea product, site operation personnel should be noted and observes and ensure that in feed bin, urea is made adequate preparation;
The urea added enters tablets press with system returning charge, as granulation masterbatch, the high temperature slip sprayed with tubular reactor, by coating, bonding, completes granulation from granulating mode, urea then enters into diammonium phosphate product inside, in order to complete the increase of nitrogen content;
Granulation material leaves tablets press (1), enters rotary dryer (2), carries out and fluidized drying with the high-temperature flue gas from hotblast stove, and drying machine is tiny structure under the effect of dried tail gas blower fan (29);
Material through super-dry passes through the conveying of belt (3), bucket elevator (4), under the effect of material distributing valve, be dispensed to five large grain sieve apparatus (5a, 5b, 5c, 5d, 5e) uniformly, large grain sieve apparatus upper materials enters after crusher (6a, 6b, 6c) carries out fragmentation, collected by return collecting belt (7), subsequently through returning charge bucket elevator (16) conveying, enter tablets press and carry out granulation again together with the urea added; Under sieve apparatus, layered material enters into two finished product screen extension sets (9a, 9b) through bucket elevator (8) and transporting chute;
The minus mesh of finished product screen extension set then enters into return collecting belt (7), returns tablets press granulation again; Upper materials enters into cooling bed (10) as diammonium phosphate product, cool through air blast, to be promoted by product bucket elevator (11) and sub-material enters two product sieve apparatus (12a, 12b) and again carries out stricter screening, further preferred product, guarantee that product granularity is even; The product introduction parcel cylinder 3 pairs of products filtered out add parcel oil and carry out external parcel, add parcel oil carry out external parcel to product, prevent product from storage transportation, occurring the phenomenons such as caking, the moisture absorption; The product wrapped is packed to storehouse in bulk storage through Belt Conveying.
17. a kind of urea that add according to claim 17 adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, and in its feature aforesaid method, the specification of raw material urea is by lower numeral expression:
The processing requirement of equipment and operational condition in aforesaid method: the slip pipe of tubular reactor (17a, 17b) is arranged two spouts, spout outside is added with nozzle, can by regulating the size of the position control spout of nozzle; Tablets press (1) wall has ventilation breather, liner offset plate, air promotes the material on offset plate by turnover ventilation breather, prevent materials from bonding on offset plate; Also be provided with preventing materials accumulation device in tablets press inside, avoid material to pile up at tablets press inside caking, keep tablets press cleaning inside; Drying machine (2) gas inlet temperature 450 DEG C-750 DEG C, Outlet Gas Temperature 82 DEG C-100 DEG C, can ensure drying machine outlet material moisture≤2.0%; Large grain sieve apparatus (5a, 5b, 5c, 5d, 5e) for individual layer be vibratory screening apparatus, mesh size 4.2 × 4.2mm, described finished product screen (9A, 9B) screen cloth is strip-type screen, aperture 3.0 mm × 30mm; Described crusher is double-shaft chain hammer mill, turns to contrary.
18. a kind of urea that add according to claim 17 adopt two-tube anti-production technique to improve the method for diammonium phosphate nitrogen content, it is characterized in that in aforesaid method, the tail gas of all generations, under the effect of blower fan, enters washing system, and has wash pools groove collection washing lotion to carry out circulation cleaning; Washing system adopts the washings of lower concentration to carry out circulated sprinkling washing to each washing tower, add certain process water to dilute simultaneously, keep concentration and the washing effect of washings, washings is all recycled to washings and reclaims as system water supplement, and qualified tail gas is then discharged by chimney (30) through blower fan draw.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815999.5A CN104529559A (en) | 2014-12-25 | 2014-12-25 | Device and method for increasing nitrogen content of diammonium phosphate by virtue of dual-tube reverse production process by adding urea |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410815999.5A CN104529559A (en) | 2014-12-25 | 2014-12-25 | Device and method for increasing nitrogen content of diammonium phosphate by virtue of dual-tube reverse production process by adding urea |
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| CN104529559A true CN104529559A (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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| CN106268499A (en) * | 2015-05-29 | 2017-01-04 | 林新吉 | Automatization's granulating system and comminutor thereof |
| CN106810321A (en) * | 2017-01-21 | 2017-06-09 | 云南三环中化化肥有限公司 | A kind of molten sulfur is added to the device and method of production sulfur-bearing phosphate fertilizer in gas phase |
| CN110818475A (en) * | 2019-12-13 | 2020-02-21 | 太原柏悟化工科技有限公司 | Production method and production device of ammonium nitrate-sulfur compound fertilizer |
| CN114180994A (en) * | 2021-12-29 | 2022-03-15 | 连云港钧格环境科技有限公司 | Production process and equipment for large-particle ammonium sulfate product |
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| CN106268499A (en) * | 2015-05-29 | 2017-01-04 | 林新吉 | Automatization's granulating system and comminutor thereof |
| CN106810321A (en) * | 2017-01-21 | 2017-06-09 | 云南三环中化化肥有限公司 | A kind of molten sulfur is added to the device and method of production sulfur-bearing phosphate fertilizer in gas phase |
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| CN114180994A (en) * | 2021-12-29 | 2022-03-15 | 连云港钧格环境科技有限公司 | Production process and equipment for large-particle ammonium sulfate product |
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