CN203613126U - Energy-saving and efficient urea low-pressure decomposition system - Google Patents
Energy-saving and efficient urea low-pressure decomposition system Download PDFInfo
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- CN203613126U CN203613126U CN201320804979.9U CN201320804979U CN203613126U CN 203613126 U CN203613126 U CN 203613126U CN 201320804979 U CN201320804979 U CN 201320804979U CN 203613126 U CN203613126 U CN 203613126U
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 239000004202 carbamide Substances 0.000 title claims abstract description 57
- 238000000354 decomposition reaction Methods 0.000 title claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 10
- 239000012530 fluid Substances 0.000 claims description 10
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 3
- 239000002351 wastewater Substances 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000003301 hydrolyzing Effects 0.000 abstract description 3
- 229910000013 Ammonium bicarbonate Inorganic materials 0.000 abstract 1
- PRKQVKDSMLBJBJ-UHFFFAOYSA-N Ammonium carbonate Chemical compound N.N.OC(O)=O PRKQVKDSMLBJBJ-UHFFFAOYSA-N 0.000 abstract 1
- 235000012538 ammonium bicarbonate Nutrition 0.000 abstract 1
- 239000001099 ammonium carbonate Substances 0.000 abstract 1
- 239000000413 hydrolysate Substances 0.000 abstract 1
- 229960000539 carbamide Drugs 0.000 description 41
- 235000013877 carbamide Nutrition 0.000 description 41
- 239000007789 gas Substances 0.000 description 12
- 238000000034 method Methods 0.000 description 11
- 238000006460 hydrolysis reaction Methods 0.000 description 10
- 239000002699 waste material Substances 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 230000002194 synthesizing Effects 0.000 description 2
- 210000000952 Spleen Anatomy 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003729 cation exchange resin Substances 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011068 load Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
Abstract
The utility model discloses an energy-saving and efficient urea low-pressure decomposition system, belongs to the technical field of urea hydrolytic decomposition, and provides the energy-saving and efficient urea low-pressure hydrolytic decomposition system which has the advantages that heat in ammonia gas is used reasonably and the high-temperature ammonia gas directly participates in urea manufacturing reaction. The technical scheme for solving the technical problem is that according to the energy-saving and efficient urea low-pressure decomposition system, a first inlet and a first outlet are respectively formed in the upper end and the lower end of a heat exchanger; a second outlet and a second inlet are respectively formed in the upper part and the lower part of the side surface of the heat exchanger; the outlet of an ammonium bicarbonate liquid tank is communicated with the second inlet; the hydrolysate outlet of a stripping column is communicated with the first inlet; the first outlet is communicated with the water inlet of a boiler; the second outlet is communicated with the steam inlet of the stripping column; the steam outlet of the stripping column is communicated with the inlet of a urea decomposition tower. The energy-saving and efficient urea low-pressure decomposition system can be widely applied to the field of urea decomposition.
Description
Technical field
The urea low pressure decomposing system of a kind of efficient energy-saving of the utility model, belongs to hydrolysis of urea technical field.
Background technology
Existing urea system low pressure hydrolysis system as described in Figure 2, process condensate and the external ammoniacal liquor of synthesis ammonia system that urea self is produced, all delivering to hydrolysis system decomposes, waste liquid after decomposing is delivered to boiler, as boiler feed water, high temperature ammonia after decomposition enters condenser and carries out coolingly, more cooling rear ammoniacal liquor is reclaimed.In ammonia condensation process, amount of heat is wasted, and the ammonia reclaiming in ammoniacal liquor taken away a large amount of nitrogen elements of manufacturing urea, has seriously restricted the production efficiency of urea.
Utility model content
The utility model has overcome the deficiency that prior art exists, and a kind of heat that can rationally utilize in hydrolysis gas is provided, and high-temperature water is vented one's spleen and participated directly in the urea low pressure decomposing system of the efficient energy-saving of producing urea reaction.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is: a kind of urea low pressure decomposing system of efficient energy-saving, comprise ammonium fluid groove, interchanger, stripping tower and urea decomposition tower, described interchanger upper, lower end arranges respectively the first entrance and the first outlet, described interchanger side upper, bottom is respectively arranged with the second outlet and the second entrance, outside surface one side of described stripping tower is provided with steam inlet, the outside surface opposite side of described stripping tower is provided with hydrolyzed solution outlet, the outlet of ammonium fluid groove is communicated with described the second entrance, the hydrolyzed solution outlet of described stripping tower is communicated with described the first entrance, the ammonium fluid that contains ammoniacal liquor is entered and in interchanger, carries out heat exchange, described the first outlet is communicated with the water-in of boiler, waste water qualified in interchanger is entered in boiler and utilized, described the second outlet is communicated with the steam inlet of stripping tower, the gas-liquid mixture outlet of described gas stripping column is communicated with the entrance of urea decomposition tower, the top of described urea decomposition tower is provided with air outlet, the bottom of described urea decomposition tower is provided with liquid outlet.
In described urea decomposition tower, be provided with gas distributor.
The beneficial effect that the utility model compared with prior art has is: the utility model is hydrolyzed gas by stripping tower and directly enters urea decomposition tower, hydrolyzed solution after hydrolysis is directly entered to urea system, not only for the reaction of producing urea provides heat, and hydrolysis gas has also obtained recycling as reaction raw materials, simplify the production technique of urea, save the energy, reduced the working cost of equipment.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is described further.
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the existing structure schematic diagram of hydrolysis of urea system.
In figure, 1 is that ammonium fluid groove, 2 is that interchanger, 3 is that stripping tower, 4 is that urea decomposition tower, 5 is gas distributor.
Embodiment
As shown in Figure 1, the urea low pressure decomposing system of a kind of efficient energy-saving of the utility model, comprise ammonium fluid groove 1, interchanger 2, stripping tower 3 and urea decomposition tower 4, described interchanger 2 upper, lower end arranges respectively the first entrance and the first outlet, described interchanger 2 sides upper, bottom is respectively arranged with the second outlet and the second entrance, outside surface one side of described stripping tower 3 is provided with steam inlet, the outside surface opposite side of described stripping tower 3 is provided with hydrolyzed solution outlet, the outlet of ammonium fluid groove 1 is communicated with described the second entrance, the hydrolyzed solution outlet of described stripping tower 3 is communicated with described the first entrance, the ammonium fluid that contains ammoniacal liquor is entered and in interchanger 2, carries out heat exchange, described the first outlet is communicated with the water-in of boiler, during being entered to boiler, waste water qualified in interchanger 2 utilizes, described the second outlet is communicated with the steam inlet of stripping tower 3, the gas-liquid mixture outlet of described gas stripping column 3 is communicated with the entrance of urea decomposition tower 4, the top of described urea decomposition tower 4 is provided with air outlet, the bottom of described urea decomposition tower 4 is provided with liquid outlet.
In described urea decomposition tower 4, be provided with gas distributor 5.
In the utility model, urea decomposition tower 4 is two points of towers of urea system.The volatilization gas of discharging from the air outlet, top of urea decomposition tower 4 enters urea low pressure recovery system, and the urea solution of discharging from the bottom liquid outlet of urea decomposition tower 4 enters vapo(u)rization system.
The utility model is energy-saving and cost-reducing, reach make flow process more succinctly, the object that more easy to operate, working cost is lower, meet condensed liquid in urea preparing process is the requirement of ammonia and carbonic acid gas by the urea decomposition in waste liquid under low pressure, high temperature, simultaneously, again can recycle-water solution vapor phase ammonia and the heat energy of carbonic acid gas, not only material recycle is thorough, and reasonable energy utilization, and comprehensive benefit is remarkable.Waste liquid is at temperature 50 C, reach 6%～8%(wt in ammonia concentration) in the situation that, after processing, ammonia and urea content are all less than 10ppm, reach discharging standards completely, after reverse osmosis or anion-cation exchange resin processing, can be used as high-grade boiler feed water, improved the utility value of waste liquid.
The utility model adopts and is different from existing technical process in the market, has strengthened the particularly comprehensive utilization of high level heat of heat energy.The heat that fully reclaims each link, not only makes flow process greatly simplify, and reduce facility investment, and reduced the steam consumption of urea production, and the recirculated water kinetic energy consumption of lowering the temperature step by step, running cost reduces greatly.
Technical characterstic of the present utility model:
1, technical process.Hydrolysis gas phase reclaims heat by ad hoc internals at low pressure decomposing system, reduce after water content, enter low pressure absorption system and carry out condensation, compare completely different from former desorption technique, do not increase condensation load, do not change operative employee's operating habit, make heat energy utilization rationally, fully, carbamide production system steam consumption effectively reduces.
2, because hydrolysis gas temperature after heat recuperation reduces, the water-content in hydrolysis gas reduces, and makes to return the discharge reduction of synthesis system, is conducive to urea synthesizer transformation efficiency and improves, and also makes urea steam consumption reduce.
3, because technical process is simplified greatly, compared with existing other low-pressure urea technology for hydrolyzing, cancel the cooling and regulation system of reflux exchanger, level tank, Warm water circulation, cancelled reflux pump and corresponding electric instrument control system, regulation system, without the required CO of air lift
2and the adding of anticorrosion air, flow process is short, and equipment is few, and pipeline is few.Simultaneously easy and simple to handle, working cost is low.
By reference to the accompanying drawings embodiment of the present utility model is explained in detail above, but the utility model is not limited to above-described embodiment, in the ken possessing those of ordinary skills, can also under the prerequisite that does not depart from the utility model aim, make various variations.
Claims (2)
1. the urea low pressure decomposing system of an efficient energy-saving, it is characterized in that: comprise ammonium fluid groove (1), interchanger (2), stripping tower (3) and urea decomposition tower (4), described interchanger (2) upper, lower end arranges respectively the first entrance and the first outlet, described interchanger (2) side upper, bottom is respectively arranged with the second outlet and the second entrance, outside surface one side of described stripping tower (3) is provided with steam inlet, the outside surface opposite side of described stripping tower (3) is provided with hydrolyzed solution outlet, the outlet of ammonium fluid groove (1) is communicated with described the second entrance, the hydrolyzed solution outlet of described stripping tower (3) is communicated with described the first entrance, the ammonium fluid that contains ammoniacal liquor is entered in interchanger (2) and carries out heat exchange, described the first outlet is communicated with the water-in of boiler, qualified waste water in interchanger (2) is utilized in entering boiler, described the second outlet is communicated with the steam inlet of stripping tower (3), the gas-liquid mixture outlet of described gas stripping column (3) is communicated with the entrance of urea decomposition tower (4), the top of described urea decomposition tower (4) is provided with air outlet, the bottom of described urea decomposition tower (4) is provided with liquid outlet.
2. the urea low pressure decomposing system of a kind of efficient energy-saving according to claim 1, is characterized in that: in described urea decomposition tower (4), be provided with gas distributor (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320804979.9U CN203613126U (en) | 2013-12-10 | 2013-12-10 | Energy-saving and efficient urea low-pressure decomposition system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320804979.9U CN203613126U (en) | 2013-12-10 | 2013-12-10 | Energy-saving and efficient urea low-pressure decomposition system |
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| Publication Number | Publication Date |
|---|---|
| CN203613126U true CN203613126U (en) | 2014-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320804979.9U Expired - Fee Related CN203613126U (en) | 2013-12-10 | 2013-12-10 | Energy-saving and efficient urea low-pressure decomposition system |
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| Country | Link |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285415A (en) * | 2017-08-15 | 2017-10-24 | 佛山市亚科恒远科技有限公司 | A kind of new Wastewater Stripping Unit |
| CN109589753A (en) * | 2018-11-25 | 2019-04-09 | 鲁西化工集团股份有限公司 | A kind for the treatment of process of the ammonium fluid in urea absorption system |
-
2013
- 2013-12-10 CN CN201320804979.9U patent/CN203613126U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107285415A (en) * | 2017-08-15 | 2017-10-24 | 佛山市亚科恒远科技有限公司 | A kind of new Wastewater Stripping Unit |
| CN109589753A (en) * | 2018-11-25 | 2019-04-09 | 鲁西化工集团股份有限公司 | A kind for the treatment of process of the ammonium fluid in urea absorption system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140528 Termination date: 20141210 |
|
| EXPY | Termination of patent right or utility model |