CN203307256U - Synthesis stripper plant for preparing urea - Google Patents
Synthesis stripper plant for preparing urea Download PDFInfo
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- CN203307256U CN203307256U CN2013204144756U CN201320414475U CN203307256U CN 203307256 U CN203307256 U CN 203307256U CN 2013204144756 U CN2013204144756 U CN 2013204144756U CN 201320414475 U CN201320414475 U CN 201320414475U CN 203307256 U CN203307256 U CN 203307256U
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- China
- Prior art keywords
- pipeline
- synthetic
- stripper
- ammonium
- high pressure
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Abstract
The utility model relates to the field of chemical engineering, and in particular relate to a synthesis stripper plant for preparing urea. The synthesis stripper plant comprises a methylamine formation reaction device, wherein a pipeline of the methylamine formation reaction device is connected with a methylamine dehydration synthesis device, a pipeline of the methylamine dehydration synthesis device is connected with a carbon dioxide stripping tower, the upper part of the carbon dioxide stripping tower is connected with the methylamine formation reaction device through a pipeline, and the lower part of the carbon dioxide stripping tower is connected with a low pressure circulating system through a pipeline. Due to the adoption of the technical scheme, compared with the prior art, the synthesis stripper plant has the benefits that synthesis and stripping of urea can be completed at high speed, melt-down of materials is fully utilized, and heat is sufficiently utilized for carrying out comprehensive operation.
Description
Technical field
The utility model relates to chemical field, relates in particular to a kind of synthetic stripper plant for preparing urea.
Background technology
In traditional urea preparation process, Btu utilization is a large problem, because chemical plant pipeline complexity, and the basic demand in the different process process and processing requirement all have larger difference, but common process equipment is difficult to realize the recycling of material and the multistage use of energy.
The utility model content
The purpose of this utility model is to provide the synthetic stripper plant for preparing urea of a kind of efficient, safety, environmental protection and energy saving.
In order to realize above purpose, the utility model adopts following technical scheme: a kind of synthetic stripper plant for preparing urea, comprise first ammonium formation reaction device, its pipeline connects first ammonium dehydration synthesizer, first ammonium dehydration synthesizer pipeline connects urea carbon dioxide stripper, urea carbon dioxide stripper top has pipeline to connect first ammonium formation reaction device, and below has pipeline connecting the low pressure recycle system.
The further technical scheme of the utility model is that the r gamma ray level meter is arranged below described urea carbon dioxide stripper.
The further technical scheme of the utility model is, by pipeline, connects high pressure scrubber above described first ammonium dehydration synthesizer.
The further technical scheme of the utility model is, accesses central circulating tube after described high pressure scrubber connection submerged condenser.
The further technical scheme of the utility model is, above described first ammonium dehydration synthesizer, blow-off valve is arranged.
The further technical scheme of the utility model is, described high pressure scrubber also pipeline connects absorption tower.
The further technical scheme of the utility model is, described urea carbon dioxide stripper is also contacting the sealing high pressure steam heating recycle system.
The further technical scheme of the utility model is, the described sealing high pressure steam heating recycle system, for the sealing pipeline, has the saturation steam bag on it, be used to collecting the phlegma after heating steam.
The further technical scheme of the utility model is, described high pressure scrubber inside comprises explosion-proof space.
Adopt as above the utility model of technical scheme, with respect to prior art, following beneficial effect is arranged: can complete at a high speed the synthetic and air lift of urea, and take full advantage of material and melt down, take full advantage of heat and comprehensively operate.
The accompanying drawing explanation
Fig. 1 is the structural representation of the utility model embodiment, wherein: 1 first ammonium formation reaction device; 2 first ammonium dehydration synthesizers; 3 urea carbon dioxide strippers; The 4r gamma ray level meter; 5 low pressure recycle systems; 6 blow-off valves; 8 high pressure scrubbers; 9 submerged condensers; 10 absorption towers; The 11 sealing high pressure steam heating recycle systems; 12 central circulating tubes.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described, embodiment does not form restriction of the present utility model.
Embodiment
As shown in Figure 1, a kind of synthetic stripper plant for preparing urea, comprise first ammonium formation reaction device 1, its pipeline connects first ammonium dehydration synthesizer 2, first ammonium dehydration synthesizer 2 pipelines connect urea carbon dioxide stripper 3, urea carbon dioxide stripper 3 tops have pipeline to connect first ammonium formation reaction device 1, and below has pipeline connecting low pressure recycle system 5.There is r gamma ray level meter 4 urea carbon dioxide stripper 3 belows.First ammonium dehydration synthesizer 2 tops connect high pressure scrubber 8 by pipeline.High pressure scrubber 8 connects the rear access central circulating tube 12 of submerged condenser 9.There is blow-off valve 6 first ammonium dehydration synthesizer 2 tops.High pressure scrubber 8 is gone back pipeline and is connected absorption tower 10.Urea carbon dioxide stripper 3 is also contacting the sealing high pressure steam heating recycle system 11.The sealing high pressure steam heating recycle system 11, for the sealing pipeline, has the saturation steam bag on it, be used to collecting the phlegma after heating steam.High pressure scrubber 8 inside comprise explosion-proof space.
The present embodiment prepares the working process of the synthetic stripper plant of urea:
First ammonium liquid and stripping gas that liquefied ammonia is come together with suction enter first ammonium formation reaction device 1.Material is dirty along pipe after sparger mixes, and the first ammonium generates rapidly and emit a large amount of reaction heat, manages outer steam condensate and removes reaction heat by-product low-pressure steam.
From first ammonium formation reaction device liquids and gases out, enter respectively the bottom of first ammonium dehydration synthesizer 2, carry out first ammonium dehydration reaction.By NH
3And CO
2For raw material reaction generates urea, it has been generally acknowledged that minute two steps carry out: the first step is the formation reaction of first ammonium:
2NH
3(l)+CO
2(g)＝＝NH
2COONH
4(l)+98.00KJ
Second step is the reaction that the dehydration of first ammonium generates urea:
NH
2COONH
4(l)＝＝CO(NH
2)
2(l)+H
2O-15.07KJ
Total reaction formula is:
2NH
3(l)+CO
2(g)＝＝CO(NH
2)
2(l)+H
2O+82.93KJ
NH
3And CO
2The total reaction that generates urea is the reaction of reversible, heat release, volume-diminished, and reaction must be carried out in high temperature, high pressure and liquid phase.Superfluous ammonia impels CO
2Conversion, so ammonia carbon ratio general control is between 3.0-3.2.
In first ammonium dehydration synthesizer 2,10 sieve plates are housed, to impel gas-liquid mixed well and to avoid back-mixing.When material left first ammonium dehydration synthesizer 2, temperature was 183 ℃, with CO
2Calculating transformation efficiency is about more than 57%.
Leave the urea soln of first ammonium dehydration synthesizer 2, flow into the liquid distributor at urea carbon dioxide stripper 3 tops and become membranaceous dirty along tube wall; Enter the CO of tower bottom
2Gas from bottom to top with the liquid film Surface Contact, make NH
3Dividing potential drop reduce rapidly, thereby impel in urine free NH
3Steam.
The decomposition of first ammonium: institute's heat requirement is supplied with by the high-pressure saturated steam that adds urea carbon dioxide stripper 3 shell-sides.Due to the CO that enters urea carbon dioxide stripper 3
2Temperature lower and the effusion of superfluous ammonia and the decomposition of first ammonium, the urine temperature after stripping is down to 160～175 ℃ and is gone out tower.The gas that leaves urea carbon dioxide stripper 3 enters first ammonium formation reaction device 2 tops.Urea carbon dioxide stripper 3 shell-side vapor pressures can be regulated, and along with the difference of load, vapor pressure is 1.6～2.0MPa.
The liquid level of urea carbon dioxide stripper 3 bottoms r gamma ray level meter 4 records.Going out urea carbon dioxide stripper 3 urine pressure is that the 0.3MPa left and right enters low pressure recycle system 5 by the 14.0MPa decompression.
On first ammonium dehydration synthesizer 2 gaseous phase outlet pipes, blow-off valve 6 is housed.First ammonium dehydration synthesizer 2 is given vent to anger through the explosion-proof space of high pressure scrubber 8, from high pressure scrubber 8 bottoms, enters the bottom of submerged condenser 9.The first ammonium liquid come from high pressure carbamate pump enters central circulating tube 12 by high pressure scrubber 8 tops, and mixes with gas down to submerged condenser 9 bottoms, then through tubulation, constantly rise, and the NH in gas
3And CO
2In this condensation and emit heat.The gas-liquid mixed separate rear part divides liquid to reenter central circulating tube 12 together with first ammonium liquid that first ammonium pump is made, and most of first ammonium liquid returns to synthesis system.Unabsorbed gases is decompressed to 0.6MPa in high pressure scrubber, delivers to first ammonium dehydration synthesizer 2 and reclaims, and nonabsorbable gas is through sound damper emptying.
Gas in high pressure scrubber 8 during condensation liberated heat by the tempered water that shell-side seals, removed, this tempered water, through recycle pump and water cooler sealing and circulating, is controlled the temperature adjustment water yield, the tempered water temperature that makes to enter high pressure scrubber 8 remains on 120 ℃ of left and right.
Claims (9)
1. synthetic stripper plant for preparing urea, it is characterized in that, comprise first ammonium formation reaction device (1), its pipeline connects first ammonium dehydration synthesizer (2), first ammonium dehydration synthesizer (2) pipeline connects urea carbon dioxide stripper (3), urea carbon dioxide stripper (3) top has pipeline to connect first ammonium formation reaction device (1), and below has pipeline connecting low pressure recycle system (5).
2. a kind of synthetic stripper plant for preparing urea according to claim 1, is characterized in that, there is r gamma ray level meter (4) described urea carbon dioxide stripper (3) below.
3. a kind of synthetic stripper plant for preparing urea according to claim 1, is characterized in that, described first ammonium dehydration synthesizer (2) top connects high pressure scrubber (8) by pipeline.
4. a kind of synthetic stripper plant for preparing urea according to claim 3, is characterized in that, described high pressure scrubber (8) accesses central circulating tube (12) after connecting submerged condenser (9).
5. a kind of synthetic stripper plant for preparing urea according to claim 1, is characterized in that, there is blow-off valve (6) described first ammonium dehydration synthesizer (2) top.
6. a kind of synthetic stripper plant for preparing urea according to claim 4, is characterized in that, described high pressure scrubber (8) is gone back pipeline and connected absorption tower (10).
7. a kind of synthetic stripper plant for preparing urea according to claim 1, is characterized in that, described urea carbon dioxide stripper (3) is also contacting the sealing high pressure steam heating recycle system (11).
8. a kind of synthetic stripper plant for preparing urea according to claim 7, is characterized in that, the described sealing high pressure steam heating recycle system (11) is the sealing pipeline, and the phlegma after the saturation steam bag is collected heating steam is arranged on it.
9. a kind of synthetic stripper plant for preparing urea according to claim 4, is characterized in that, described high pressure scrubber (8) inside comprises explosion-proof space.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204144756U CN203307256U (en) | 2013-07-11 | 2013-07-11 | Synthesis stripper plant for preparing urea |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204144756U CN203307256U (en) | 2013-07-11 | 2013-07-11 | Synthesis stripper plant for preparing urea |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203307256U true CN203307256U (en) | 2013-11-27 |
Family
ID=49613478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204144756U Expired - Fee Related CN203307256U (en) | 2013-07-11 | 2013-07-11 | Synthesis stripper plant for preparing urea |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203307256U (en) |
-
2013
- 2013-07-11 CN CN2013204144756U patent/CN203307256U/en not_active Expired - Fee Related
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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: 20131127 Termination date: 20170711 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |