CN1219704C - Technique for recycling waste fluid containing urea - Google Patents
Technique for recycling waste fluid containing urea Download PDFInfo
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- CN1219704C CN1219704C CN 200310109628 CN200310109628A CN1219704C CN 1219704 C CN1219704 C CN 1219704C CN 200310109628 CN200310109628 CN 200310109628 CN 200310109628 A CN200310109628 A CN 200310109628A CN 1219704 C CN1219704 C CN 1219704C
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- Prior art keywords
- urea
- technology
- steam
- desorption
- wastewater
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 152
- 239000004202 carbamide Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims description 23
- 239000002699 waste material Substances 0.000 title abstract description 12
- 239000012530 fluid Substances 0.000 title 1
- 238000004064 recycling Methods 0.000 title 1
- 238000003795 desorption Methods 0.000 claims abstract description 37
- 239000002351 wastewater Substances 0.000 claims abstract description 35
- 238000005516 engineering process Methods 0.000 claims abstract description 18
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000001704 evaporation Methods 0.000 claims abstract description 12
- 230000008020 evaporation Effects 0.000 claims abstract description 9
- 238000010992 reflux Methods 0.000 claims abstract description 7
- 235000013877 carbamide Nutrition 0.000 claims description 70
- 239000007788 liquid Substances 0.000 claims description 24
- 238000009833 condensation Methods 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 14
- 230000005494 condensation Effects 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000011084 recovery Methods 0.000 claims description 8
- 239000006200 vaporizer Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 6
- 239000003344 environmental pollutant Substances 0.000 abstract 1
- 238000000605 extraction Methods 0.000 abstract 1
- 231100000719 pollutant Toxicity 0.000 abstract 1
- 230000007062 hydrolysis Effects 0.000 description 20
- 238000006460 hydrolysis reaction Methods 0.000 description 20
- 238000007599 discharging Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 235000019628 coolness Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 241000282326 Felis catus Species 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
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- Physical Water Treatments (AREA)
- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The present invention relates to a technology for recovering waste liquor containing urea. The technology is characterized in that the waste liquor containing urea is desorbed in a desorption tower (4); desorption gas is condensed by a condenser (5), part of the desorption gas is used as top reflux, and part of the desorption gas returns back to a urea production system. Urea solution which is discharged by the desorption tower (4) is evaporated and concentrated by middle-pressure steam, and the urea concentrated solution is sent back to a urea evaporation system, and delivered to an evaporator (10) to be concentrated by the middle-pressure steam. The urea concentrated solution returns back to the urea evaporation system, and the generated secondary steam is delivered to a low-pressure steam system. The technology has the advantage that under the condition of basically no decrease of the utilization valves of the middle-pressure steam, the present invention achieves the purpose of urea extraction; under the same processing capacity, the equipment investment only accounts for 1/3 of that of the hydrolyzation-desorption technology; simultaneously, the water circulation amount of the urea production system can not be enhanced; the zero discharge of the waste water containing urea is realized; the pollution of the discharged pollutants on environment is eliminated; the resource is saved; the production cost is reduced; the enterprise's economic benefit is enhanced; the technology has obvious social benefit, economic benefit and popularization prospect.
Description
Technical field
The present invention relates to the processing of waste water solution in the chemical production field, relate to contain in the urea production process the dense recovery technology of putting forward of urea wastewater specifically.
Background technology
The resulting urea wastewater that contains generally contains NH in factory that makes urea's urea evaporating concentration process
3, CO
2And 1～3% urea, because its serious contaminative, this waste liquid can not directly be discharged in the environment.NH wherein
3, CO
2Usually can propose dense recovery by desorb, and urea is because its non-volatile difficult recovery.Present treatment process generally adopts hydrolysis and desorption technology, guarantees at a certain temperature that promptly containing urea wastewater has enough residence time in hydrolysis tower, so that it is hydrolyzed to NH
3And CO
2, and then reclaimed by stripping or rectifying and to enter carbamide production system.This hydrolysis and desorption technology is divided Dan Ta and two kinds of flow processs of two towers again usually.
As shown in Figure 1, in same tower, be hydrolyzed in the prior art and desorb contain the urea wastewater purification process: contain urea wastewater self-condensation liquid bath 1 after heat exchanger 2 preheatings, enter in the hydrolysis and desorption tower 4, by steam heating, hydrolysis of urea is NH
3And CO
2And in company with the NH that exists in the former waste liquid
3And CO
2Common desorb, stripping gas is after reflux exchanger 5 condensations, and partial condensation liquid is as trim the top of column, and all the other return carbamide production system, the discharging after heat exchanger 2 and water cooler 3 coolings of the bottom liquid effluent of hydrolysis and desorption tower 4.
What Figure 2 shows that hydrolysis and desorb are carried out respectively in the prior art in two towers contains the urea wastewater purification process: contain urea wastewater self-condensation liquid bath 1 after heat exchanger 2 preheatings, enter in first desorption tower 4 NH in the waste liquid
3And CO
2Most of desorb, stripping gas is after reflux exchanger 5 condensations, and partial condensation liquid is as trim the top of column, and first desorption tower, 4 bottom liquid effluents are gone into hydrolysis tower 6 through heat exchanger 7 heating are laggard, this hydrolysis tower provides hydrolysis institute heat requirement by steam, and hydrolysis of urea is NH in the waste liquid in this tower
3And CO
2, the raffinate after the hydrolysis enters second desorption tower 8 after heat exchanger 7 heat exchange, in this tower steam with raffinate in NH
3And CO
2Desorb removes once more, liquid effluent discharging after heat exchanger 2 and water cooler 3 coolings at the bottom of the tower, and the cat head vent gas is as first desorption tower, 4 heating gas.
Find that by long-term industrial production there is following problem in said hydrolyzed-desorption technique:
1. be abundant hydrolysis, require to contain urea wastewater and in equipment, stops and reach 80～100 minutes, so required equipment be huge that investment is high, as a cover processing liquid measure 5m
3The hydrolysis device of/h need be made an investment in more than 100 ten thousand yuans.
2. for making the urea decomposition that contains in the urea wastewater, need under excessive steam, to operate, thereby must consume a large amount of high temperature and high pressure steams, and then cause high energy consumption and high process cost.
3. that reclaims contains NH
3, CO
2Moisture more in the gas, cause H in the urea after sending Urea Conversion System back to
2O/CO
2Improve, increased the energy consumption of urea synthesis.
The employing that also has in the prior art in addition is only with the NH in the waste liquid
3And CO
2Reclaim the technical process that contains the direct discharging of urea wastewater after the desorb by the desorption tower desorb.Be illustrated in figure 3 as do not have a hydrolysis contain urea wastewater desorption technique flow process: contain urea wastewater self-condensation liquid bath 1 after heat exchanger 2 preheatings, enter desorption tower 4, by steam heating, the NH in the urea wastewater
3And CO
2Desorb, stripping gas is after reflux exchanger 5 condensations, partial condensation liquid is as trim the top of column, all the other return carbamide production system, desorption tower 4 bottom liquid effluents after heat exchanger 2 cooling as discharge of wastewater.Though this technology flow process and equipment are simple, only in desorption tower, reclaimed the NH in the waste liquid by desorb
3And CO
2, and contained urea wastewater directly discharges, and this processing method has not only caused financial loss, and the waste water that exceeds standard has simultaneously caused severe contamination to environment.
Summary of the invention
Contain the above problem that exists in the urea wastewater processing technological flow at existing urea process, low-pressure steam mostly is the characteristics that the middle pressure steam decompression comes in conjunction with the factory that makes urea's low pressure steam purposes that with coal is raw material is more, the invention provides a kind of urea technique and contain the dense recovery technical process of proposing of urea wastewater, be used to solve problems such as high energy consumption, the high process cost of prior art and the discharging that exceeds standard.
The object of the present invention is achieved like this:
At first will contain urea wastewater self-condensation liquid bath 1 after heat exchanger 2 preheatings, send into desorption tower 4, make the NH that contains in the urea wastewater by the steam indirect heating
3And CO
2Desorb;
To contain NH then
3And CO
2Stripping gas through reflux exchanger 5 condensations, phlegma is divided into two-way, the one tunnel as trim the top of column, carbamide production system is returned on another road;
The urea wastewater that contains that desorption tower 4 is discharged is divided into two-way again, desorption tower 4 bottoms are returned in 9 heating of one tunnel process reboiler, vaporizer 10 middle pressure steam evaporation concentration is sent on another road, when being concentrated to urea concentration when being 20～50%, send the urea concentrated solution that obtains back to Urea Evaporation System, the secondary steam that produces in the vaporizer 10 is drawn and is delivered to steam vapour system.
Wherein said middle pressure steam is 500～3.9 * 10
3Kpa, the control evaporating pressure is 200～500Kpa during evaporation, secondary steam pressure is 200～500Kpa, to satisfy the requirement of steam vapour system.
The technical progress that the present invention obtains:
1. facility investment is few, and facility investment only is about 1/3 of a hydrolysis and desorption technology under the same processing power.
2. made full use of the useful energy of middle pressure steam, promptly be issued to the purpose of carrying dense recovery urea in the condition that does not reduce the middle pressure steam utility value substantially.
3. existing containing in the urea wastewater hydrolysis and desorption technology, urea is hydrolyzed into NH
3And CO
2Recovery is entrained with a large amount of water often and enters carbamide production system.And the present invention proposes dense recovery with waste liquid, thereby can not cause water cycle amount raising in the carbamide production system.
4. really realized containing the zero release of urea wastewater, eliminated the pollution of discharging of waste liquid environment.
5. save resource, reduced production cost, improved the business economic benefit.Contain urea wastewater hydrolysis and desorption technology with the urea technique of using always at present and compare, a factory that produces 100000 tons of urea per year can reclaim 400～1200 tons in urea every year more.
Description of drawings
Below in conjunction with drawings and the specific embodiments the present invention is further described:
Fig. 1 is the desorption technique schematic flow sheet that is hydrolyzed in the prior art in same tower.
Wherein 1 represents the condensation liquid bath, and 2 is heat exchanger, and 3 is water cooler, and 4 is the hydrolysis and desorption tower, and 5 is condenser.
Fig. 2 is for being hydrolyzed in two towers respectively in the prior art-process flow diagram of desorb.
Wherein 4 is first desorption tower, and 6 is hydrolysis tower, and 7 is heat exchanger, and 8 is second desorption tower.
Fig. 3 is a prior art desorption technique schematic flow sheet.
Fig. 4 is a process flow diagram of the present invention.
Embodiment
Embodiment 1: as shown in Figure 4, at first urea technique is contained urea, NH
3And CO
2Waste liquid self-condensation liquid bath 1 after heat exchanger 2 preheatings, send into desorption tower 4, make the NH that contains in the urea wastewater by the steam indirect heating
3And CO
2Desorb; To contain NH then
3And CO
2Stripping gas through reflux exchanger 5 condensations, phlegma is divided into two-way, the one tunnel as trim the top of column, carbamide production system is returned on another road; The urea wastewater that desorption tower 4 is discharged is divided into two-way again, desorption tower 4 bottoms are returned in 9 heating of one tunnel process reboiler, vaporizer 10 is sent on another road, be controlled at evaporation concentration under the pressure of 300Kpa with the middle pressure steam of 2000Kpa, when being concentrated to urea concentration when being 40%, send the urea concentrated solution that obtains back to Urea Evaporation System, and the secondary steams that produce in the vaporizer 10 are drawn and are delivered to steam vapour system, to satisfy the requirement of steam vapour system.
Below enumerate other embodiments of the invention, difference from Example 1 sees the following form:
| Middle pressure steam (Kpa) | Secondary steam pressure (Kpa) | Solution urea concentration (%) | |
| | 1000 | 500 | 20 |
| | 1300 | 300 | 30 |
| | 3900 | 200 | 50 |
Claims (4)
1. one kind contains urea wastewater recovery technology, and its feature may further comprise the steps:
A. will contain urea wastewater self-condensation liquid bath (1) after heat exchanger (2) preheating, send into desorption tower (4), make NH by the steam indirect heating
3And CO
2Desorb;
B. contain NH
3And CO
2Stripping gas through reflux exchanger (5) condensation, phlegma is divided into two-way, the one tunnel as trim the top of column, carbamide production system is returned on another road;
C. the urea wastewater that contains of desorption tower (4) discharge divides two-way, and desorption tower (4) bottom is returned in 9 heating of one tunnel process reboiler, and another road is sent into vaporizer (10) and used the middle pressure steam evaporation concentration, and the urea concentrated solution that obtains returns Urea Evaporation System;
D. the secondary steam of vaporizer (10) generation is drawn and is delivered to steam vapour system.
2. the urea wastewater that contains according to claim 1 reclaims technology, it is characterized in that described middle pressure steam is 500～3.9 * 10
3Kpa, evaporating pressure are 200～500Kpa.
3. the urea wastewater that contains according to claim 1 reclaims technology, it is characterized in that described urea concentrated solution concentration is 20～50%.
4. the urea wastewater that contains according to claim 1 reclaims technology, it is characterized in that described secondary steam pressure is 200～500Kpa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310109628 CN1219704C (en) | 2003-10-31 | 2003-10-31 | Technique for recycling waste fluid containing urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310109628 CN1219704C (en) | 2003-10-31 | 2003-10-31 | Technique for recycling waste fluid containing urea |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1539748A CN1539748A (en) | 2004-10-27 |
| CN1219704C true CN1219704C (en) | 2005-09-21 |
Family
ID=34335301
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200310109628 Expired - Fee Related CN1219704C (en) | 2003-10-31 | 2003-10-31 | Technique for recycling waste fluid containing urea |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1219704C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100400430C (en) * | 2006-05-18 | 2008-07-09 | 刘国胜 | Energy saving, purifying and recovering process for urea process condensate |
| CN101823984B (en) * | 2010-04-29 | 2012-11-28 | 聊城市鲁西化工工程设计有限责任公司 | Process and device for reclaiming hydrolysis desorption heat energy |
| CN103058436B (en) * | 2012-12-25 | 2014-01-08 | 中国海洋石油总公司 | Method for reducing content of ammonia nitrogen in urea process condensate |
| CN103013727B (en) * | 2012-12-28 | 2015-09-02 | 新疆盛世龟兹葡萄酒有限公司 | A kind of Novel waste discharge device |
| CN103214047B (en) * | 2013-04-23 | 2014-05-07 | 清华大学 | Method for recycling NH3-N from ammoninted waste liquid |
| CN104418396B (en) * | 2013-08-24 | 2016-07-06 | 蔡京鹏 | A kind of desalinization or effluent treatment plant |
| CN104445476B (en) * | 2014-11-25 | 2017-01-25 | 江苏和诚制药设备制造有限公司 | Ethyl alcohol biogas slurry deamination technology and equipment |
| EP3782979A1 (en) * | 2019-08-20 | 2021-02-24 | Yara International ASA | Preparation of urea solution and facility to do so |
-
2003
- 2003-10-31 CN CN 200310109628 patent/CN1219704C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1539748A (en) | 2004-10-27 |
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HEBEI ZHENGYUAN CHEMICAL GROUP CO., LTD. Free format text: FORMER NAME OR ADDRESS: LIU JINCHENG |
|
| CP03 | Change of name, title or address |
Address after: No. 6 Xiang Xiang Road, Hebei, Shijiazhuang Patentee after: Hebei Zhengyuan chemical group Limited by Share Ltd Address before: Hebei Shijiazhuang economic and Technological Development Zone (Liang Village) road 17, Shijiazhuang Seiko Chemical Equipment Co., Ltd. Patentee before: Liu Jincheng |
|
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050921 Termination date: 20111031 |