CN105169891B - A kind of net ammonia process of urea tail gas - Google Patents
A kind of net ammonia process of urea tail gas Download PDFInfo
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- CN105169891B CN105169891B CN201510544724.7A CN201510544724A CN105169891B CN 105169891 B CN105169891 B CN 105169891B CN 201510544724 A CN201510544724 A CN 201510544724A CN 105169891 B CN105169891 B CN 105169891B
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Abstract
The invention belongs to field of urea production, specially a kind of net ammonia process of urea tail gas.The technique comprises the following steps：By ammonia condenser Lai the gas ammonia containing inert gas not being condensed enter inert gas scrubber carry out bubble absorption, cleaning solution from tail gas ammonia-cleaning tower is pumped into the bottom of inert gas scrubber by ammoniacal liquor, progressively overflow to and lazy wash device level tank, gas rises with liquid cocurrent, ammonia density progressively increases in liquid, ammonia content is gradually reduced in uprising gas, inert gas containing micro-ammonia is discharged into tail gas ammonia-cleaning tower by pressure-regulating valve, and pressure absorption section is used as absorbing liquid during the ammonia spirit of recovery is returned by potential difference.Cooled down because the application tail gas ammonia-cleaning tower is absorbed using multistage, advantageously reduce and bring system water into.And special Explosion-proof Design is used, not only ensure production safety but also ensure absorption maximum effect.Equipment will not also be damaged by occurring explosion time even if tail gas, it is ensured that equipment operation safety.
Description
Technical field
The invention belongs to field of urea production, specially a kind of net ammonia process of urea tail gas.
Background technology
Urea【CO(NH2)2】Alias is carbonyl diamide, phosphoamide, urea, and human and animal is primarily present in nature
In the urine of excretion.Its is widely used, is not only a kind of high-efficiency nitrogen fertilizer for agricultural production, and is the change commonly used in industry
Work raw material.
In production of urea with full circulation of aqueous solution, to ensure that exhaust emissions meets safe and environment-friendly requirement needs pair
Ammonia content is controlled in tail gas, and mainly the tail gas ammonia content of ammonia condensing absorption section is controlled.
Inert gas is in the gas that ammonia condenser comes out：H2、O2、N2Deng（These gases are not joined for the synthesis of urea
Plus reaction）.A source part for inert gas is to bring the H of system into raw materials ammonia and feed carbon dioxide gas2, another portion
Point it is to prevent the air added in the corrosion of synthetic tower, feed carbon dioxide gas.Because of the relation of vapor liquid equilibrium, ammonia condensing
Contain many ammonia in the inert gas of device outlet.
This part ammonia is washed after device absorbed by weak aqua ammonia through lazy, the lazy ammonia content reduction washed in device exit gas, inert gas
Content increases.Enter back into tail to inhale after tower, the ammonia in gas is absorbed using carbide ammonia solution.Inert gas content increases again,
Its component has been enter into blast interval, under certain ignition factor（Such as naked light, hit, welding, friction etc.）In the presence of the risk of blast.
On the other hand, because tail inhales tower using carbonated aqueous ammonia as absorbing liquid, it absorbs the ability of a small amount of gas ammonia in gas
It is extremely limited.Assimilation effect is poor, and operation difficulty is big, easily causes superpressure, with abnormal operating modes such as liquid, and the gas ammonia in tail gas contains
Amount is 4%（mol）Left and right, so causes consumption high, environmental pollution is caused again.
The content of the invention
The present invention is based on above technical problem, and there is provided a kind of safety, environmental protection, and the net ammonia work of easy-operating urea tail gas
Skill.
The technical scheme is that：
A kind of net ammonia process of urea tail gas, the technique comprises the following steps：
By ammonia condenser Lai the gas ammonia containing inert gas not being condensed, into inert gas scrubber carry out bubbling
Absorb, inert gas scrubber is tubulation upright radiator, tube side walks cooling water.Cleaning solution from tail gas ammonia-cleaning tower is by ammoniacal liquor
The bottom of inert gas scrubber is pumped into, is progressively overflowed on the level tank of inert gas scrubber, gas and liquid cocurrent
Rise, ammonia density progressively increases in liquid, and ammonia content is gradually reduced in uprising gas, and the inert gas containing micro-ammonia is by pressure
Regulating valve is discharged into tail gas ammonia-cleaning tower, and pressure absorption section is used as absorbing liquid during the ammonia spirit of recovery is returned by potential difference.
Described tail gas ammonia-cleaning tower includes tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and ammonia-cleaning tower C, goes out the lazy gas for washing device level tank
Tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and ammonia-cleaning tower C, steaming of the gas in tail gas ammonia-cleaning tower C after cooling down are sequentially entered after decompression
Vapour condensate liquid is washed, and cleaning solution flows through tail gas ammonia-cleaning tower C, tail gas ammonia-cleaning tower B successively and tail gas ammonia-cleaning tower A enters to gas
Row washing.
Described cleaning solution is sent to inert gas scrubber by aqua ammonia pump and is continuing with as absorbing liquid.
The gas for going out inert gas scrubber level tank sequentially enters tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and net ammonia after decompression
Tower C, steam condensate of the gas in tail gas ammonia-cleaning tower C after cooling down is washed, and goes out the gas of tail gas ammonia-cleaning tower through decompression
After discharge.
Component has reached that blast is interval after inert gas is washed through tail gas ammonia-cleaning tower.Tail gas ammonia-cleaning tower service pressure
For 0.5MPa, to ensure equipment safety, tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and ammonia-cleaning tower C, gas tail gas ammonia-cleaning tower C according to
6.3MPa pressure ratings are designed, and equipment is not easily susceptible to damage.
Compared with prior art, beneficial effects of the present invention are：
（One）, gas and liquid cocurrent rise in inert gas scrubber, absorption efficiency is high.Lazy device of washing is that tubulation is vertical
Cooler, using full liquid phase scrubbing, does not set gas-phase space.Reduce equipment volume, it is easy to arrange.
（Two）, tail gas ammonia-cleaning tower using multistage absorb cooling, advantageously reduce and bring system water into.And using special explosion-proof
Design, had not only ensured production safety but also had ensured absorption maximum effect.Equipment will not also be damaged by occurring explosion time even if tail gas.Ensure to set
Received shipment row safety.
（Three）, absorbing liquid is used as using steam condensate.Steam condensate makes to be free of titanium dioxide in ammoniacal liquor as absorbing liquid
Carbon, thoroughly prevent assimilation effect it is poor, easily block pipeline equivalent risk, production operation more safety and stability.Steam condensate is to gas
The absorption of ammonia is more thorough, it is ensured that assimilation effect, it is ensured that ammonia content qualified discharge in tail gas.
Brief description of the drawings：
Fig. 1 is the schematic flow sheet of the net ammonia process of conventional urea tail gas described in the embodiment of the present invention 2.
Fig. 2 is the schematic flow sheet of the net ammonia process of urea tail gas in the present invention.
Embodiment
In order that the content of the invention of the present invention easily facilitates understanding, below in conjunction with the drawings and specific embodiments to this hair
It is bright to be further elaborated.But the scope that this should not be interpreted as to above-mentioned theme of the invention is only limitted to following embodiments.
In this application, inert gas scrubber is also referred to as lazy washing device.
The net ammonia process of urea tail gas comprises the following steps：By ammonia condenser Lai the gas containing inert gas not being condensed
Ammonia enters inert gas scrubber and carries out bubble absorption, and inert gas scrubber is tubulation upright radiator, and tube side walks cooling water.
Cleaning solution from tail gas ammonia-cleaning tower is pumped into the bottom of inert gas scrubber by ammoniacal liquor, progressively overflows to inert gas washing
The level tank of device, gas rises with liquid cocurrent, and ammonia density progressively increases in liquid, and ammonia content is gradually reduced in uprising gas,
Inert gas containing micro-ammonia is discharged into tail gas ammonia-cleaning tower by pressure-regulating valve, and the ammonia spirit of recovery is returned by potential difference
Middle pressure absorption section is used as absorbing liquid.
Described tail gas ammonia-cleaning tower includes tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and ammonia-cleaning tower C, goes out the lazy gas for washing device level tank
Tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and ammonia-cleaning tower C, steaming of the gas in tail gas ammonia-cleaning tower C after cooling down are sequentially entered after decompression
Vapour condensate liquid is washed, and cleaning solution flows through tail gas ammonia-cleaning tower C, tail gas ammonia-cleaning tower B successively and tail gas ammonia-cleaning tower A enters to gas
Row washing.Described cleaning solution is sent to inert gas scrubber by aqua ammonia pump and is continuing with as absorbing liquid.Go out inert gas washing
The gas of device level tank sequentially enters tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and ammonia-cleaning tower C after decompression, and gas is in tail gas ammonia-cleaning tower C
In steam condensate after cooling down washed, the gas for going out tail gas ammonia-cleaning tower is discharged after decompression.
Embodiment 1：
So that a residual heat integrative for producing 300000 tons of urea per year utilizes technique as an example, the parameter that the net ammonia process of urea tail gas is used
For：Gas ammonia from ammonia condenser, into the ton hour of gas flow 3.64 of inert gas scrubber, the molar concentration of gas ammonia is
89.88%, the gas flow for going out inert gas scrubber is 1.12 ton hours, and the molar concentration of gas ammonia is 65.78%, goes out tail gas net
The gas flow of ammonia tower is 0.42 ton hour（Wherein gas ammonia≤3.7 ㎏/hour）, molar content≤1% of gas ammonia.Product urea is
41.67 ton hours.
The gas ammonia containing inert gas not being condensed from ammonia condenser enters inert gas scrubber and carries out bubbling
Absorb, operating pressure is 1.7MPa.Inert gas scrubber is tubulation upright radiator, and tube side walks cooling water.Tail gas ammonia-cleaning tower
Cleaning solution is pumped into the bottom of inert gas scrubber by ammoniacal liquor, progressively overflows to the level tank of inert gas scrubber, gas
Rise with liquid cocurrent, ammonia density progressively increases in liquid, and ammonia content is gradually reduced in uprising gas.Contain containing 65.78% mole
The inert gas for measuring ammonia is discharged into tail gas ammonia-cleaning tower by pressure-regulating valve, and the ammonia spirit of recovery is pressed in being returned by potential difference to be inhaled
Section of knocking off is used as absorbing liquid.
Go out the inert gas containing 65.78% molar content ammonia of inert gas scrubber level tank through being decompressed to
Tail gas ammonia-cleaning tower A, tail gas ammonia-cleaning tower B and tail gas ammonia-cleaning tower C are sequentially entered after 0.5MPa.Gas is in tail gas ammonia-cleaning tower C by cold
But the steam condensate after is washed, and tail gas ammonia-cleaning tower C gas outlet is provided with a vertical spray washing section, fresh steaming
Vapour condensate liquid is added, and carries out spray washing to discharge gas, it is ensured that its concentration of emission≤1%（mol%）.Cleaning solution flows back
To tail gas ammonia-cleaning tower C, tail gas ammonia-cleaning tower C, tail gas ammonia-cleaning tower B are flowed through successively and tail gas ammonia-cleaning tower A is washed to gas.
Cleaning solution is sent to inert gas scrubber by aqua ammonia pump and is continuing with as absorbing liquid, goes out the gas of tail gas ammonia-cleaning tower through depressurizing heel row
Put.
Embodiment 2：
By taking the energy-conservation technological transformation technique for producing 120000 tons of urea per year as an example, urea tail gas is carried out using traditional technique net
Ammonia, the flow chart of traditional handicraft is as shown in Fig. 2 its parameter used is：Gas ammonia from ammonia condenser, is washed into inert gas
The ton hour of gas flow 1.14 of device is washed, the molar concentration of gas ammonia is 91.84%, the gas flow for going out inert gas scrubber is 0.37
Ton hour, the molar concentration of gas ammonia is 52.44%, and the gas flow for going out tail gas ammonia-cleaning tower is 0.216 ton hour（Wherein gas ammonia 6.5
㎏/hour）, the molar content 4% or so of gas ammonia.Product urea is 16.67 ton hours.
The gas ammonia containing inert gas not being condensed from ammonia condenser enters inert gas scrubber and carries out bubbling
Absorb, operating pressure 1.7MPa.Inert gas scrubber is tubulation upright radiator, and tube side walks cooling water.Absorb cleaning solution by
Ammoniacal liquor is pumped into inert gas scrubber bottom, and gas rises with liquid cocurrent, and ammonia density progressively increases in liquid, uprising gas
Middle ammonia content is gradually reduced.Inert gas containing 52.44% ammonia is discharged into tail gas absorber by pressure-regulating valve, recovery
Pressure absorption section is used as absorbing liquid during ammonia spirit is returned by potential difference.
Go out the inert gas that inert gas scrubber contains 52.44% ammonia and tail gas suction is sequentially entered after being decompressed to normal pressure
Receive tower.Gas is washed from top to bottom in tail gas absorber by process condensate, and cleaning solution is arranged by tail gas absorption tower bottom
Enter storage tank, the gas for going out tail gas absorber gas ammonia content 4% drains into emptying house steward, and one is to cause production consumption height, and two be to ring
Border is polluted.
Carried out using the net ammonia process of urea tail gas described in the present invention：Gas ammonia from ammonia condenser, device is washed into lazy
The ton hour of gas flow 1.14, the molar concentration of gas ammonia is 91.84%, goes out the lazy gas flow for washing device for 0.37 ton hour, gas ammonia
Molar concentration be 52.44%, go out tail gas ammonia-cleaning tower gas flow be 0.213 ton hour（Wherein gas ammonia≤0.9 ㎏/hour）,
Molar content≤0.62% of gas ammonia.Product urea is 16.67 ton hours.
The gas ammonia containing inert gas not being condensed from ammonia condenser enters inert gas scrubber and carries out bubbling
Absorb, operating pressure 1.7MPa.Inert gas scrubber is tubulation upright radiator, and tube side walks cooling water.Tail gas ammonia-cleaning tower is washed
Wash liquid and inert gas scrubber bottom is pumped into by ammoniacal liquor, progressively overflow to the level tank of inert gas scrubber, gas and liquid
Body cocurrent rises, and ammonia density progressively increases in liquid, and ammonia content is gradually reduced in uprising gas.Inertia containing 52.44% ammonia
Gas is discharged into tail gas ammonia-cleaning tower by pressure-regulating valve, and pressure absorption section absorbs during the ammonia spirit of recovery is returned by potential difference
Liquid is used.
Go out the inert gas containing 52.44% ammonia of inert gas scrubber level tank after being decompressed to 0.5MPa successively
Into tail gas ammonia-cleaning tower A, tail gas ammonia-cleaning tower B and tail gas ammonia-cleaning tower C.Steam of the gas in tail gas ammonia-cleaning tower C after cooling down is cold
Lime set is washed, and tail gas ammonia-cleaning tower C gas outlet is provided with a vertical spray washing section, and fresh steam condensate is herein
Place is added, and carries out spray washing to discharge gas, it is ensured that its concentration of emission≤1%（mol%）.Cleaning solution is back to tail gas ammonia-cleaning tower
After C, tail gas ammonia-cleaning tower C, tail gas ammonia-cleaning tower B are flowed through successively and tail gas ammonia-cleaning tower A is washed to gas.Cleaning solution is by ammoniacal liquor
Pumping goes inert gas scrubber to be continuing with as absorbing liquid, goes out the gas of the gas ammonia content of tail gas ammonia-cleaning tower≤1% through depressurizing heel row
Put.
Technological transformation is later from the gas ammonia of ammonia condenser, into the ton hour of gas flow 1.14 of inert gas scrubber, gas ammonia
Molar concentration is 91.84%, and the gas flow for going out inert gas scrubber is 0.37 ton hour, and the molar concentration of gas ammonia is
52.44%, the gas flow for going out tail gas ammonia-cleaning tower is 0.213 ton hour（Wherein gas ammonia≤0.9 ㎏/hour）, gas ammonia mole contains
Amount≤0.62%.Product urea is 16.67 ton hours.
The gas ammonia containing inert gas not being condensed from ammonia condenser enters inert gas scrubber and carries out bubbling
Absorb, operating pressure 1.7MPa.Inert gas scrubber is tubulation upright radiator, and tube side walks cooling water.Tail gas ammonia-cleaning tower is washed
Wash liquid and inert gas scrubber bottom is pumped into by ammoniacal liquor, progressively overflow to the level tank of inert gas scrubber, gas and liquid
Body cocurrent rises, and ammonia density progressively increases in liquid, and ammonia content is gradually reduced in uprising gas.Inertia containing 52.44% ammonia
Gas is discharged into tail gas ammonia-cleaning tower by pressure-regulating valve, and pressure absorption section absorbs during the ammonia spirit of recovery is returned by potential difference
Liquid is used.
Go out the inert gas containing 52.44% ammonia of inert gas scrubber level tank after being decompressed to 0.5MPa successively
Into tail gas ammonia-cleaning tower A, tail gas ammonia-cleaning tower B and tail gas ammonia-cleaning tower C.Steam of the gas in tail gas ammonia-cleaning tower C after cooling down is cold
Lime set is washed, and tail gas ammonia-cleaning tower C gas outlet is provided with a vertical spray washing section, and fresh steam condensate is herein
Place is added, and carries out spray washing to discharge gas, it is ensured that its concentration of emission≤1%（mol%）.Cleaning solution is back to tail gas ammonia-cleaning tower
After C, tail gas ammonia-cleaning tower C, tail gas ammonia-cleaning tower B are flowed through successively and tail gas ammonia-cleaning tower A is washed to gas.Cleaning solution is by ammoniacal liquor
Pumping goes inert gas scrubber to be continuing with as absorbing liquid, goes out the gas of the gas ammonia content of tail gas ammonia-cleaning tower≤0.62% through decompression
After discharge.
From data above, traditional method, the molar content 4% or so of its gas ammonia, this technique after being improved,
Under identical condition, molar content≤0.62% of gas ammonia, it is ensured that ammonia content qualified discharge in tail gas, environmental pollution is dropped significantly
It is low, outstanding contributions are made to energy-conserving and environment-protective.
Claims (3)
1. a kind of net ammonia process of urea tail gas, it is characterised in that the technique comprises the following steps：
By ammonia condenser Lai the gas ammonia containing inert gas not being condensed, into inert gas scrubber carry out bubbling suction
Receive, the cleaning solution from tail gas ammonia-cleaning tower is pumped into the bottom of inert gas scrubber by ammoniacal liquor, progressively overflows to inert gas
The level tank of washer, gas rises with liquid cocurrent, and ammonia density progressively increases in liquid, and ammonia content progressively subtracts in uprising gas
Few, the inert gas containing micro-ammonia is discharged into tail gas ammonia-cleaning tower by pressure-regulating valve, and the ammonia spirit of recovery relies on potential difference
Absorption section is pressed to be used as absorbing liquid in return；
Described tail gas ammonia-cleaning tower includes tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and ammonia-cleaning tower C, goes out inert gas scrubber level tank
Gas sequentially enters tail gas ammonia-cleaning tower A, ammonia-cleaning tower B and ammonia-cleaning tower C after decompression, and gas is in tail gas ammonia-cleaning tower C after cooling down
Steam condensate washed, cleaning solution flows through tail gas ammonia-cleaning tower C, tail gas ammonia-cleaning tower B and tail gas ammonia-cleaning tower A to gas successively
Body is washed；Described cleaning solution is sent to inert gas scrubber by aqua ammonia pump and is continuing with as absorbing liquid；Described tail gas
Ammonia-cleaning tower is tubulation horizontal type cooler.
2. the net ammonia process of urea tail gas according to claim 1, it is characterised in that：Go out the gas of tail gas ammonia-cleaning tower through decompression
After discharge.
3. the net ammonia process of urea tail gas according to claim 1, it is characterised in that：Described tail gas ammonia-cleaning tower A, ammonia-cleaning tower
B and ammonia-cleaning tower C design pressure grade is 6.3MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510544724.7A CN105169891B (en) | 2015-08-31 | 2015-08-31 | A kind of net ammonia process of urea tail gas |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510544724.7A CN105169891B (en) | 2015-08-31 | 2015-08-31 | A kind of net ammonia process of urea tail gas |
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| Publication Number | Publication Date |
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| CN105169891A CN105169891A (en) | 2015-12-23 |
| CN105169891B true CN105169891B (en) | 2017-09-01 |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000084358A (en) * | 1998-09-11 | 2000-03-28 | Hitachi Plant Eng & Constr Co Ltd | Treatment of waste gas containing ammonia and device therefor |
| CN2616278Y (en) * | 2003-04-21 | 2004-05-19 | 项文裕 | Primary absorbing system towers for urea apparatus |
| EA013218B1 (en) * | 2004-12-08 | 2010-04-30 | ДСМ АйПи АССЕТС Б.В. | Process for the removal of ammonia from an ammonia-containing gas stream |
| US8404027B2 (en) * | 2008-11-04 | 2013-03-26 | Alstom Technology Ltd | Reabsorber for ammonia stripper offgas |
| CN201949777U (en) * | 2011-01-07 | 2011-08-31 | 四川金圣赛瑞化工有限责任公司 | Low-pressure absorption device for urea production |
| US8961915B1 (en) * | 2013-09-25 | 2015-02-24 | Ohio State Innovation Foundation | Wet scrubber for ammonia capture |
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2015
- 2015-08-31 CN CN201510544724.7A patent/CN105169891B/en active Active
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