CN1150163C - Desorption process by deep hydrolysis for condensed liquid in urea processing process - Google Patents
Desorption process by deep hydrolysis for condensed liquid in urea processing process Download PDFInfo
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- CN1150163C CN1150163C CNB001346849A CN00134684A CN1150163C CN 1150163 C CN1150163 C CN 1150163C CN B001346849 A CNB001346849 A CN B001346849A CN 00134684 A CN00134684 A CN 00134684A CN 1150163 C CN1150163 C CN 1150163C
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- hydrolysis
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Abstract
The present invention relates to a new technology for deeply hydrolyzing and desorbing urea technological condensate liquid, which is characterized in that after being hydrolyzed in a urea hydrolyzing tower, technological condensate liquid containing ammonia, urea and carbon dioxide is desorbed; then the technological condensate liquid is filled in a desorption tower of an original urea device to be further desorbed; by simple flow and operation and low investment for devices, the treated urea technological condensate liquid contains 1 to 3 ppm of ammonia and 1 to 3 ppm of urea. Thereby, the pollution of waste liquid discharged from the urea device is thoroughly eliminated, and the consumption of raw materials is reduced. After being slightly purified, the treated technological condensate liquid can be used as boiler feed water.
Description
The invention belongs to a kind of production technique of urea, relate in particular to a kind of desorption process by deep hydrolysis for condensed liquid in urea processing process.
External the most competitive urea patent technology is as the CO of Dutch Si Tamikabang
2Stripping process, Italian compass in ancient China Pu Ji carries the NH of company
3The ACES technology of stripping process and Japanese Toyo Engineering Corporation, desorption process by deep hydrolysis for condensed liquid in urea processing system all are first through desorb, remove most of NH
3And CO
2After, pressurized hydrolysis again, process condensate reduces pressure and delivers to second desorption tower after the hydrolysis.These technical process are complicated, equipment is many, operation control is also comparatively complicated.
The large, medium and small urea plant that China's the eighties is introduced later on all has depth hydrolysis's desorption system.And China's process condensate that the middle-size and small-size urea plant of about 170 covers of domestic design voluntarily produces since the sixties mostly only promptly discharges through desorb, contain ammonia and still reach 500～700ppm, contained urea 1.0～1.5% is all reclaimed without hydrolysis, not single pollutent exceed standard greatly contaminate environment and the consumption that has strengthened raw material ammonia.Under the current country situation strict day by day to environmental requirement, solving these middle-size and small-size urea plant effluent discharges should be the task of top priority to the pollution problem of environment.
The purpose of this invention is to provide a kind of desorption process by deep hydrolysis for condensed liquid in urea processing process, simplify flow process and operation, and reduce the investment of device, thoroughly eliminated the pollution of urea plant effluent discharge, reduce consumption of raw materials.
Desorption process by deep hydrolysis for condensed liquid in urea processing process of the present invention is characterized in that delivering to the further desorb of desorption tower that the crude urine white, quiet clothes are put then with containing process condensate desorb after the first hydrolysis in the hydrolysis of urea tower of ammonia, urea and carbonic acid gas.
Hydrolysis tower epimere of the present invention is a stripping stage, and hypomere is a hydrolysis section, and structure is seen Figure of description 2.Hydrolysis tower is made up of cylindrical shell 7, column plate 8, downtake 9, gas distributor 10, riser 11, downtake 12, dividing plate 13 and steam distributor 14.The bottom steam distribution is even, every all introducing live steam, imports the top stripping stage along riser then, and makes full use of steam stripping agent and the heating thermal source of the required steam of desorb as hydrolysis section, makes the hydrolysis section NH that gives vent to anger
3And CO
2Dividing potential drop extremely low, the strength of fluid gradient is big, can accelerate the hydrolysis rate of urea greatly, and process condensate is carried out depth hydrolysis's desorb in this tower.
Hydrolysis tower is given vent to anger and is delivered to the distilling period of pressing decomposing system in former, and (and abroad all technology hydrolysis towers are given vent to anger all through reducing pressure after and stripping gas is delivered to the low pressure absorption system in the lump) can obtain the effect of achieving many things at one stroke like this.One, load that can the whole urea plant of balance, along with many factories energy-saving and production-increase is transformed, when high pressure loop after energy-saving and production-increase is transformed, in press to decompose absorption system load 50% of the original design load of only having an appointment, low pressure is decomposed absorption system then becomes bottleneck with excess load.This novel process is given vent to anger the hydrolyzing and desorbing tower and is caused the middle decomposing system of pressing, with the load of reduction low pressure absorption system, thus the ability of equilibrium system.They are two years old, can reclaim the give vent to anger heat (condensation of other flow process hydrolysis gas absorbs heat and mostly removes with water coolant and be not utilized at the low pressure absorption system) of higher potential energy of hydrolysis tower, hydrolysis tower given vent to anger to be caused the distilling period elder generation's recovery part heat that press to decompose in former and reduces water-content in the gas, and venting one's spleen with one section branch then causes one section vaporization heat in the lump and utilize section further to reclaim its heat.Its three, the low pressure absorption system is easier operation, reduces because of low pressure absorbs tolerance, corresponding water amount also reduces, and helps the water balance of system.Its four, still can utilize original desorption tower, although device capability improves, this moment, former desorption tower load was very low, because of most of ammonia and carbonic acid gas are separated sucking-off at hydrolysis tower, thus still applicable, thereby reduce investment.
This depth hydrolysis's desorption system does not influence the ordinary production of original device fully in implementation process, can set up separately in that former urea technology framework is other, and floor space is little, is applicable to that fully the process condensate of domestic middle-size and small-size urea plant is handled.
Fig. 1 is a process flow sheet of the present invention.
Fig. 2 is the hydrolysis tower structure iron.
The composition of present middle-size and small-size urea plant effluent discharge and amount:
NH
3(% by weight) CO2(% by weight) Ur (% by weight) measures (kg/Tu) medium-sized urea plant 0.07 0.034 1.2-1.5-480 Small Urea Plant 0.07 0.18 1.15-320
Adopt new technology of the present invention, the condensed liquid in urea preparing process after the processing contains ammonia and each 1～3ppm of urea, thereby Thoroughly eliminate the pollution of urea plant effluent discharge, reduced consumption of raw materials, and the process condensate after processing Can do boiler feedwater after making with extra care a little. Society and factory there is obvious benefit.
New technology of the present invention is because flow process is simple, and the equipment number of units is few, and operation control is simple, and close with original device In conjunction with, utilize existing equipment as far as possible, so required investment is less, it is estimated the technology by the 880T/D urea plant About 2,600,000 yuan of condensate liquid depth hydrolysis desorption system gross investment. And annual ammonia and the urea that reclaims can increase production urine Plain 1050 ton/years, (press Small Urea Plant and discharge the liquid composition, 300 days meters of year operation) sells by urea per ton Valency is 1100 yuan of meters, then can increase by 115.5 ten thousand yuan of incomes every year, spend the investment 2 years three months can be in addition Reclaim. So adopt the process condensate of this depth hydrolysis's desorb new_type treatment urea plant, not only thoroughly disappear Except discharging the pollution of liquid to environment, has good social benefit. Factory also there is good economy itself Benefit, popularizing application prospect is wide, and market is also big.
Describe the present invention below in conjunction with embodiment:
Urea plant one, dual circulation system and airtight discharging gained contain NH
3～5%, CO
2～2% and the process condensate 1 of urea 1～1.5%, P-01 is forced into 2.45Mpa by the hydrolysis feeding pump, is preheated to the top of 180～185 ℃ of laggard hydrolysis tower R-01 of going into through the hydrolysis first preheater E-01, the second preheater E-02.Hydrolysis tower is vertical, is divided into two portions up and down, and epimere is a stripping stage, hypomere is a hydrolysis section, working pressure is 2.0～2.1MPa, and service temperature is 200～210 ℃, and the tower hypomere is every injecting 2.45MPa middle pressure steam 2 as hydrolysis of urea and ammonia, the required thermal source of carbonic acid gas desorb.Liquid flow at the bottom of the tower from top to bottom, and at high temperature with under the effect of certain residence time, the urea in the process condensate is all hydrolysis almost.And most of ammonia and carbonic acid gas also at this hydrolysis tower by desorb.Hydrolysis tower is given vent to anger and 3 is delivered to one section destructive distillation section that urea plant is pressed decomposing system in former after deriving.The hydrolysis tower fluid is delivered to former desorption tower C-01 top by Liquid level adjusting valve control after hydrolysis tower second preheater reclaims heat, the tower rising pouring is gone into 0.5～0.6MPa low-pressure steam 4 and continued to separate ammonia and carbonic acid gas remaining in the sucking-off solution.Former desorption tower is still by original design, gives vent to anger 5 to deliver to former low pressure absorption system.Must contain at the bottom of the tower ammonia and carbonic acid gas each＜processing of 3ppm after process condensate 6 after hydrolysis first preheater reclaims heat, discharge the battery limit (BL) by former liquid level variable valve control.The refining a little make up water that can do oiler feed of process condensate after this handles.
Claims (4)
1, a kind of desorption process by deep hydrolysis for condensed liquid in urea processing process, it is characterized in that: will contain process condensate first hydrolysis in the hydrolysis of urea tower of ammonia, urea and carbonic acid gas, deliver to the further desorb of desorption tower that the crude urine white, quiet clothes are put then, its technical process is: process condensate directly boosts to 2.45MPa and delivers to hydrolysis tower, hydrolysis under 2.0MPa pressure is decompressed to 0.5-0.6MPa then and further separates the residual NH of sucking-off
3And CO
2
2, technology as claimed in claim 1 is characterized in that hydrolysis tower is made up of cylindrical shell (7), column plate (8), downtake (9), gas distributor (10), riser (11), downtake (12), dividing plate (13) and steam distributor (14).
3, technology as claimed in claim 1 is characterized in that the hydrolysis tower epimere is a stripping stage, and hypomere is a hydrolysis section, and utilizes steam stripping agent and the heating thermal source of the required steam of desorb as hydrolysis section.
4, technology as claimed in claim 1 is characterized in that hydrolysis tower is given vent to anger to deliver to the distilling period of pressing decomposing system in former.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001346849A CN1150163C (en) | 2000-12-05 | 2000-12-05 | Desorption process by deep hydrolysis for condensed liquid in urea processing process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB001346849A CN1150163C (en) | 2000-12-05 | 2000-12-05 | Desorption process by deep hydrolysis for condensed liquid in urea processing process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1356313A CN1356313A (en) | 2002-07-03 |
| CN1150163C true CN1150163C (en) | 2004-05-19 |
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ID=4596364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001346849A Expired - Fee Related CN1150163C (en) | 2000-12-05 | 2000-12-05 | Desorption process by deep hydrolysis for condensed liquid in urea processing process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1150163C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101696177B (en) * | 2009-11-02 | 2012-07-04 | 河南心连心化肥有限公司 | Device for processing urea process condensate and method thereof |
| CN102167412B (en) * | 2011-04-08 | 2013-01-30 | 吉林化工学院化工分离技术开发中心 | High-efficiency composite urea waste liquid deep hydrolysis desorption tower |
| WO2013165245A1 (en) * | 2012-05-03 | 2013-11-07 | Stamicarbon B.V. | Urea production plant |
| CN105383643B (en) * | 2015-11-12 | 2018-04-24 | 沪东中华造船(集团)有限公司 | Stainless steel groove profile compartment alignment schemes |
| EP3782979A1 (en) * | 2019-08-20 | 2021-02-24 | Yara International ASA | Preparation of urea solution and facility to do so |
-
2000
- 2000-12-05 CN CNB001346849A patent/CN1150163C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1356313A (en) | 2002-07-03 |
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Granted publication date: 20040519 Termination date: 20131205 |