CN107556094A - A kind of production technology of synergistic urea - Google Patents
A kind of production technology of synergistic urea Download PDFInfo
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- CN107556094A CN107556094A CN201710662779.7A CN201710662779A CN107556094A CN 107556094 A CN107556094 A CN 107556094A CN 201710662779 A CN201710662779 A CN 201710662779A CN 107556094 A CN107556094 A CN 107556094A
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Abstract
The present invention relates to a kind of production technology of synergistic urea, including：By one section evaporation after mass concentration be 95% urine Trunk Line or dual circulation after mass concentration be that one branch's urine step is drawn in the Trunk Line of 99.5% urine；Branch's urine and synergist and defoamer mixed dissolution are uniformly obtained into synergy liquid step；Synergy liquid is sent back in the Trunk Line between evaporator and granulating system, into granulating system granulation step.The present invention has the advantage that：(1) from common urea to synergistic urea change the line of production when it is more flexibly rapid；(2) transitional product caused by during changing the line of production is few；(3) normal operation of common urea master device is had little to no effect after changing the line of production；(4) it is 1 from the mass ratio of branch's amount of urine that main line takes out and main line amount of urine：(5~50), synergistic urea product Biuret Content is influenceed smaller.
Description
Technical field
The present invention relates to a kind of production technology of synergistic urea, belongs to technical field of fertilizer production.
Background technology
Urea has the advantages that nitrogen content height, stable performance, is easy to storage, is Fertilizers main at present, urea can
It is widely used in the top dressing of field crop, fruit trees and vegetables, such as wheat, corn, cotton, rice, fruit tree are spread fertilizer over the fields, rush and apply；Should
With conveniently and extensively.According to open source information, about 41,500,000 tons of the agricultural urea requirement in China in 2016, industrial urea requirement is about
16500000 tons, about 9,000,000 tons of the urea requirement in outlet.However, according to open source information, common urea utilization rate in China's only has at present
30% or so, hence it is evident that less than the level of developed country 50~60%.The urea nitrogenous fertilizer of China's agricultural consumption is close to 20,000,000 tons/year
(purity nitrogen), volatilized, eluted and urea nitrogenous fertilizer that the approach such as runoff loses reaches 10,000,000 tons by gaseous state, convert into urea 2100
More ten thousand tons, 45,000,000,000 yuan of direct economic loss not only causes the huge waste of the energy and resource, and very big prestige is caused to environment
The side of body.Urea can slowly be converted into ammonium nitrogen after being administered to soil, then be then converted to nitrate nitrogen, thing absorption is made for, in this process
In be frequently accompanied by ammonia nitrogen, NO volatilization, the loss of nitrate nitrogen, not only aggravated greenhouse effects, polluted underground water and earth's surface
Water, eutrophication, underground water and the crop nitrate nitrogen content for also creating rivers and lakes are exceeded.This part remained in soil
Chemical fertilizer, soil texture will be caused to be deteriorated, the soil texture is degenerated.Therefore, in order to improve the utilization rate of urea, reduce loss, reduce
Environmental risk etc., urea is improved to obtain synergistic urea, turns into one of effective way to solve the above problems at present.
At present, the production technology of synergistic urea is broadly divided into following a few classes：
(1) added in the evaporator before granulation tower, uniformly mixed with the urea of melting, then in the form of the synergist aqueous solution
Implement to be granulated.Such as Chinese patent document CN103524197A discloses " boracic synergistic urea and its preparation method and application ",
By poly-aspartic-acid chelating potassium and the aqueous solution of organic boronic amine salt, with melting in the evaporator before squeezing into granulation tower with constant displacement pump
The urea melted uniformly mixes, and then implements granulation and obtains the preparation method of boracic synergistic urea.
(2) added in the form of synergist solution in the urine storage tank before evaporator.Such as Chinese patent document
CN1736958A, " a kind of slow release long-acting urea and its preparation and application " is disclosed, formaldehyde and dicyanamide are added by formula rate
Enter in the urine storage tank to before evaporator, be well mixed, then evaporation prilling, obtains the preparation side of slow release long-acting urea product
Method.
(3) added in the form of solid, powdery synergist in the urine storage tank before evaporator, mix and make with molten urea
Grain.Such as Chinese patent document CN1736958A, " a kind of slow release long-acting urea and its preparation and application " is disclosed, by solid powder
Last shape formaldehyde and dicyanamide are added directly into the urine storage tank before evaporator, are well mixed, then evaporation prilling, is sustained
The preparation method of long-acting carbamide product.
(4) it is added in the form of the synergist aqueous solution between one section of evaporation and dual circulation, is mixed simultaneously with molten urea
It is granulated.Such as Chinese patent document CN102515945A, " a kind of Algae synergistic urea and its production method and purposes " is disclosed,
Obtained fermentation seaweed extracted liquor urea is added to using measuring pump between one section of evaporation of urea prilling tower and dual circulation to melt
Melt in liquid, be well mixed, be then granulated and obtain the preparation method of Algae synergistic urea.
The production technology mentioned in the prior art enumerated above, has the following disadvantages in actual applications：
(1) synergist is added in molten state urea as an aqueous solution, due to introducing substantial amounts of water, steaming can be increased
The produce load of device and comminutor is sent out, energy consumption is added, improves production cost.
(2) synergist is added directly into the form of powdery solid in the urine storage tank before evaporator or by synergist with water
Solution form is added between one section of evaporation and dual circulation, due to containing builder ingredient in evaporator condensation liquid, is returned former
After system, original system can be polluted, so as to add system time swap, generates substantial amounts of transitional product；In addition, return to original
The condensate liquid of system can increase material viscosity, material fluidity easily be influenceed, so as to add due to containing builder ingredient
SR；Due to containing builder ingredient in system externally discharged waste water, discharging standards can be exceeded, increase environmental protection pressure.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of production technology of synergistic urea, to solve above-mentioned existing skill
Technical problem present in art.
Term explanation：
Urine：Urine of the present invention is the abbreviation of urea melting liquid.
Trunk Line：Refer to pipeline of the urine after one section of evaporation or after dual circulation during arrival granulating system.
Technical scheme is as follows：
A kind of production technology of synergistic urea, including：
By one section evaporation after mass concentration be 95% urine Trunk Line or dual circulation after mass concentration be
One branch's urine step is drawn in the Trunk Line of 99.5% urine；
Branch's urine and synergist and defoamer mixed dissolution are uniformly obtained into synergy liquid step；
Synergy liquid is sent back in the Trunk Line between evaporator and granulating system, into granulating system granulation step.
, according to the invention it is preferred to, the mass flow of urine in the mass flow and Trunk Line of described branch's urine
Ratio is 1:(5~50)；
Preferably, the mass flow ratio of urine is (1~100) in the mass flow of described synergist and Trunk Line:
1000；
Preferably, the mass flow ratio of urine is (0.1~2) in the mass flow of described defoamer and Trunk Line:
1000。
, according to the invention it is preferred to, described synergist is solid synergist, and described defoamer is liquid antifoam agent；
Made it is further preferred that branch's urine enters with caused tail gas in solid synergist and liquid antifoam agent mixed dissolution step
Grain system.
According to the present invention, a kind of preferred embodiment is as follows：
A kind of production technology of synergistic urea, comprises the following steps：
(1) mixing channel is set to be used for the branch's urine dissolving synergist and defoamer separated from Trunk Line, by mixing channel
Preheating temperature be 125~135 DEG C；
(2) the synergist burden balance with loading hopper, defoamer delivery pump and defoamer dashpot are set, and respectively by synergy
Agent burden balance and defoamer delivery pump are connected with mixing channel, defoamer delivery pump are connected with defoamer dashpot, from Trunk Line
Draw branch's urine pipeline to be connected with mixing channel, draw synergy liquid feed-line from mixing channel is connected with Trunk Line；
Synergist is added to the hopper of synergist burden balance, defoamer is added to defoamer dashpot；
(3) branch's urine that temperature is 135 DEG C~140 DEG C is added to mixing channel by branch's urine pipeline, passed through simultaneously
Defoamer delivery pump adds defoamer into mixing channel, is then added and increased to mixing channel by the synergist burden balance with loading hopper
Imitate agent；
(4) it is transported to after being well mixed the urine in mixing channel, synergist and defoamer by synergy liquid feed-line
In Trunk Line, granulating system is delivered to Trunk Line urine, granulation obtains synergistic urea.
According to the present invention preferred scheme, it is further preferred that in hopper from step (2) to synergist burden balance charging
Half for bucket capacity is measured to 2/3rds, the buffering groove height reached to defoamer dashpot feeding quantity two/
2/1 to three；
The ratio of the mass flow of branch's urine and the mass flow of Trunk Line urine is 1 in step (3):(5~50), disappear
The ratio of the mass flow of infusion and the mass flow of Trunk Line urine is (0.1~2):1000, the mass flow of synergist with
The mass flow ratio of Trunk Line urine is (1~100):1000；
It is further preferred that in step (4) urine, synergist and defoamer mixed process residence time≤10 minute.
According to the present invention, described synergist is fertilizer field routine synergist, preferably humic acid and its salt, poly- asparagus fern
Propylhomoserin, urease inhibitor, nitrification inhibitor, trace element, plant growth regulator, biostimulant or and agent of loosening the soil.
According to the present invention, described defoamer is fertilizer field conventional antifoam, and preferably organic silicon modified by polyether defoams
Agent (2354), Organosiliconcopolymere defoamer (1060), silicon polyether antifoam agent (DF-1108), defoamer Span 80.
The feed postition of synergist of the present invention is that synergist directly is added into molten state with solid pulverulent form
In urea (urine).Described urine is dense for one quality drawn from one section of urine Trunk Line between evaporator and comminutor
Spend and be for 95% branch's urine or one mass concentration of the urine Trunk Line extraction between flash evaporator and comminutor
99.5% branch's urine, the former is applied to fluidized bed prilling mode, and the latter is applied to drum granulating mode and tower granulation side
Formula.
Urine, synergist and the mixed synergy liquid of defoamer of the present invention, the position for returning to original system are above-mentioned one section
The urine main line between main line or above-mentioned flash evaporator and comminutor between evaporator and comminutor, the former is applied to
Fluidized bed prilling mode, the latter are applied to drum granulating mode and tower granulation mode.
The innovative point of the present invention is the feed postition of synergist and the mixed slurry of above-mentioned synergist returning to original
Reasonably combined the position of system.Avoid moisture being introduced into evaporator and increase energy consumption and cost, avoid drawing synergist
Enter caused pollution problem in original system, avoid producing substantial amounts of transitional product.
According to synergistic urea made from the above-mentioned production technology of the present invention, it is granulated and is formed by synergist, defoamer and urine, institute
The synergist and the mass ratio of urine stated are (1~100):1000；Described defoamer and the mass ratio of urine are (0.1~2):
1000。
The urine of the production technology of synergistic urea of the present invention can be obtained by various synthesis technique steps, example
Such as formed by ammonia with carbon dioxide through high-temperature high-voltage reaction.
The production technology of synergistic urea of the present invention be applied to tower granulation, drum granulating, fluidized bed prilling, it is big or middle,
Small particle can produce.
Synergist is mainly added in urine by the synergistic urea of the present invention, its production technology, is urinated so as to which synergy be made
Element.This synergistic urea has the advantage that：(1) plant growth, enhancing crop resistance are promoted；(2) improved soil, activating soil
Nutrient, culture fertility；(3) strengthen micro- validity, improve crop quality；(4) effect of fertilizer is improved, produce are made in increase
Amount.
Compared with existing production technology, the present invention has the advantage that：
1st, directly by one section evaporation after mass concentration be 95% urine or dual circulation after mass concentration be 99.5%
One branch's urine is drawn in urine Trunk Line with dissolved solid powdery synergist, the synergy liquid after being well mixed sends evaporator back to
The Trunk Line between comminutor, because mixed synergy liquid requires no evaporator, and unnecessary water is not introduced into, so that will not
Increase the produce load of evaporator, energy consumption will not be increased, production cost will not be increased；In addition, do not contained in evaporator condensation liquid
Builder ingredient, return original system after, original system will not be polluted, from synergistic urea to common urea change the line of production when, produce
Transitional product it is few, and the normal operation of common urea master device is had little to no effect after changing the line of production.
2nd, the condensate liquid for returning to original system is free of builder ingredient, will not increase SR.
3rd, system externally discharged waste water is free of builder ingredient, not over discharging standards.
4th, it is 1 from the mass ratio of branch's amount of urine that Trunk Line is drawn and main line amount of urine：(5~50), to synergistic urea
Product Biuret Content influences smaller.
Brief description of the drawings
Fig. 1 is the flow chart of production technology of the present invention.
Embodiment
In order that those skilled in the art more fully understands technical scheme, with reference to embodiment
The present invention is described in further detail.
Embodiment 1
A kind of production technology of synergistic urea, comprises the following steps：
(1) mass flow that urine is melted to pump discharge Trunk Line urine is set as 20t/h, and pump discharge master is melted from urine
Pipeline draws branch's urine that one temperature is 135 DEG C~140 DEG C and is set as 2t/h to mixing channel, and by its mass flow, opens
Defoamer delivery pump is opened, defoamer (silicon polyether antifoam agent (DF-1108)) is added into mixing channel, defoamer mass flow is set
It is set to 4kg/h, is then turned on synergist burden balance, synergist (containing potassium fulvate, zinc, boron) is added into mixing channel, by synergy
Agent mass flow is set as 200kg/h.Mixing channel agitator, cutter are opened, slurry is well mixed.
(2) mixed slurry as obtained by slurry delivery pump by step (1) sends urine melting pump discharge Trunk Line back to, with master
Pipeline urine enters granulating system together, obtains synergistic urea.
Embodiment 2
A kind of production technology of synergistic urea, comprises the following steps：
(1) mass flow that urine is melted to pump discharge Trunk Line urine is set as 28t/h, and pump discharge master is melted from urine
Pipeline draws branch's urine that one temperature is 135 DEG C~140 DEG C and is set as 3t/h to mixing channel, and by its mass flow, opens
Defoamer delivery pump is opened, defoamer (Organosiliconcopolymere defoamer (1060)) is added into mixing channel, by defoamer quality stream
Amount is set as 5.6kg/h, is then turned on synergist burden balance, and synergist (poly-aspartate, zinc, boron) is added into mixing channel,
Synergist mass flow is set as 280kg/h.Mixing channel agitator, cutter are opened, slurry is well mixed.
(2) mixed slurry as obtained by slurry delivery pump by step (1) sends urine melting pump discharge Trunk Line back to, with master
Pipeline urine enters granulating system together, obtains synergistic urea.
Embodiment 3
A kind of production technology of synergistic urea, comprises the following steps：
(1) mass flow that urine is melted to pump discharge Trunk Line urine is set as 72t/h, and pump discharge master is melted from urine
Pipeline draws branch's urine that one temperature is 135 DEG C~140 DEG C and is set as 7t/h to mixing channel, and by its mass flow, opens
Defoamer delivery pump is opened, defoamer (Polyether Modified Polysiloxanes Defoaming Agent (2354)) is added into mixing channel, by defoamer quality
Flow set is 14kg/h, is then turned on synergist burden balance, and synergist is added into mixing channel (containing potassium fulvate, poly- asparagus fern
Propylhomoserin, zinc, boron), synergist mass flow is set as 125kg/h.Mixing channel agitator, cutter are opened, slurry is mixed
Uniformly.
(2) mixed slurry as obtained by slurry delivery pump by step (1) sends urine melting pump discharge Trunk Line back to, with master
Pipeline urine enters granulating system together, obtains synergistic urea.
Comparative example 1
Added in the evaporator before granulation tower, uniformly mixed with the urea of melting, Ran Houshi in the form of the synergist aqueous solution
Apply granulation.
Material proportion, mass flow are the same as embodiment 1.
Comparative example 2
Added in the form of synergist solution in the urine storage tank before evaporator.
Material proportion, mass flow are the same as embodiment 1.
Comparative example 3
Added in the form of solid, powdery synergist in the urine storage tank before evaporator, mix and be granulated with molten urea.
Material proportion, mass flow are the same as embodiment 1.
Comparative example 4
It is added in the form of the synergist aqueous solution between one section of evaporation and dual circulation, mixes and make with molten urea
Grain.
Material proportion, mass flow are the same as embodiment 1.
Test example
Synergy agent content in the condensate liquid of testing example 1-3 original systems, synergistic urea product Biuret Content situation, knot
Fruit is as shown in table 1.
Table 1
| Numbering index | Synergy agent content (ppm) in the condensate liquid of original system | Synergistic urea product Biuret Content (%) |
| Embodiment 1 | 0 | 0.5 |
| Embodiment 2 | 0 | 0.55 |
| Embodiment 3 | 0 | 0.52 |
| Comparative example 1 | 7.34 | 0.78 |
| Comparative example 2 | 7.78 | 0.84 |
| Comparative example 3 | 7.86 | 0.86 |
| Comparative example 4 | 7.66 | 0.6 |
As shown in Table 1, using the inventive method, return to and builder ingredient, Bu Huizeng are free of in the condensate liquid of original system
Adding system resistance.Biuret Content significantly reduces compared with prior art in synergistic urea product.
It the above is only the preferred embodiment of the present invention, it is noted that above-mentioned preferred embodiment is not construed as pair
The limitation of the present invention, protection scope of the present invention should be defined by claim limited range.For the art
For those of ordinary skill, without departing from the spirit and scope of the present invention, some improvements and modifications can also be made, these change
Enter and retouching is also considered as protection scope of the present invention.
Claims (9)
1. a kind of production technology of synergistic urea, including：
By one section evaporation after mass concentration be 95% urine Trunk Line or dual circulation after mass concentration be 99.5% urine
One branch's urine step is drawn in the Trunk Line of liquid；
Branch's urine and synergist and defoamer mixed dissolution are uniformly obtained into synergy liquid step；
Synergy liquid is sent back in the Trunk Line between evaporator and granulating system, into granulating system granulation step.
2. the production technology of synergistic urea according to claim 1, it is characterised in that the quality stream of described branch's urine
The ratio of amount and the mass flow of urine in Trunk Line is 1:(5~50).
3. the production technology of synergistic urea according to claim 1, it is characterised in that the mass flow of described synergist
Mass flow ratio with urine in Trunk Line is (1~100):1000.
4. the production technology of synergistic urea according to claim 1, it is characterised in that the mass flow of described defoamer
Mass flow ratio with urine in Trunk Line is (0.1~2):1000.
5. the production technology of synergistic urea according to claim 1, it is characterised in that described synergist is solid synergy
Agent, described defoamer are liquid antifoam agent.
6. the production technology of synergistic urea according to claim 1, comprises the following steps：
(1) mixing channel is set to be used for the branch's urine dissolving synergist and defoamer separated from Trunk Line, by the temperature of mixing channel
Degree preheating is 125~135 DEG C；
(2) the synergist burden balance with loading hopper, defoamer delivery pump and defoamer dashpot are set, and respectively matched somebody with somebody synergist
Material scale and defoamer delivery pump are connected with mixing channel, and defoamer delivery pump is connected with defoamer dashpot, are drawn from Trunk Line
Branch's urine pipeline is connected with mixing channel, and draw synergy liquid feed-line from mixing channel is connected with Trunk Line；
Synergist is added to the hopper of synergist burden balance, defoamer is added to defoamer dashpot；
(3) temperature is added to mixing channel by branch's urine pipeline and is 135 DEG C~140 DEG C of branch's urine, while pass through defoaming
Agent delivery pump adds defoamer into mixing channel, then adds synergy to mixing channel by the synergist burden balance with loading hopper
Agent；
(4) supervisor is transported to by synergy liquid feed-line after being well mixed the urine in mixing channel, synergist and defoamer
In line, granulating system is delivered to Trunk Line urine, granulation obtains synergistic urea.
7. the production technology of synergistic urea according to claim 6, it is characterised in that to synergist dispensing in step (2)
The feeding quantity of the hopper of scale for bucket capacity half to 2/3rds, the buffering reached to defoamer dashpot feeding quantity
The half of groove height is to 2/3rds.
8. the production technology of synergistic urea according to claim 6, it is characterised in that the matter of branch's urine in step (3)
The ratio for measuring flow and the mass flow of Trunk Line urine is 1:(5~50), mass flow and the Trunk Line urine of defoamer
The ratio of mass flow is (0.1~2):1000, the mass flow of synergist is (1 with the mass flow ratio of Trunk Line urine
~100):1000.
9. the production technology of synergistic urea according to claim 6, it is characterised in that urine in step (4), synergist and
Residence time≤10 minute of defoamer mixed process.
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