CN206244451U - Urea parses hydrolysis system - Google Patents
Urea parses hydrolysis system Download PDFInfo
- Publication number
- CN206244451U CN206244451U CN201621197464.7U CN201621197464U CN206244451U CN 206244451 U CN206244451 U CN 206244451U CN 201621197464 U CN201621197464 U CN 201621197464U CN 206244451 U CN206244451 U CN 206244451U
- Authority
- CN
- China
- Prior art keywords
- tower
- hydrolysis
- ammonia
- analytic
- urea
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model discloses a kind of urea parsing hydrolysis system, including Analytic Tower (1) and hydrolysis tower (2), the low pressure steam pipe (13) is connected with air duct (14), and air mass flow automatic regulating valve (15) is provided with the air duct (14)；The outlet of the Hydrolysis Tower Feeding Pump (6) is connected by pipeline with tower top on Analytic Tower (1) simultaneously, and Hydrolysis Tower Feeding Pump (6) export the pipeline that is connected with tower top on Analytic Tower (1) and the pipeline that is connected with hydrolysis tower heat exchanger on be respectively arranged with valve.The utility model allows the surface of stainless steel equipment to form fine and close diaphragm by increasing air line, so as to play a part of to avoid equipment from being corroded by urea.By the improvement to pipeline, can cause that urea and ammonia in weak aqua ammonia are all parsed, it is to avoid cause the pollution to environment, it is to avoid safety and environmental protection accident.
Description
Technical field
The utility model is related to a kind of urea parsing hydrolysis system, belongs to urea production equipment field.
Background technology
Urea plant technical process：From the synthesis ammonia decarbonization system CO2 that is vented out by compressor compresses extremely
15MPa enters dehydrogenation reactor system, and the CO2 after dehydrogenation enters synthesis with stripping operation.The conveying of synthetic ammonia installation synthesis system comes
Liquefied ammonia be pressurized to 16MPa by high-pressure ammonia pump, subsequently into synthesis and stripping operation and CO2 reaction generation urea liquid, this
When urea liquid in the concentration of urea be 55.6% (wt), enter back into circulation industrial with stripping operation urea liquid out from synthesis
Sequence, heats by urine, and after next NH3 and CO2 is decomposited in recovery urine, the concentration of urea is concentrated into urea liquid
73.57% (wt), last urea liquid enters evaporation and granulating working procedure produces qualified urea product.From vapo(u)rization system evaporation
Weak aqua ammonia out enters parsing and hydrolysis system, and by parsing the stripping and hydrolysis of hydrolysis system, weak aqua ammonia finally becomes
Ammonification and urea content all process condensates of ＜ 10ppm, process condensate are sent to removal bitter and fishiness and are used as desalination by pipeline
Water boiler of feeding is used.
Parsing and hydrolysis system are：The weak aqua ammonia got off from vapo(u)rization system evaporative condenser returns to ammonia vessel, contains in weak aqua ammonia
There are part ammonia and urea.In ammonia vessel weak aqua ammonia enter after desorber feed pump pressurizes desorber heat exchanger with from desorber
Lower tower bottom high-temp liquid out is exchanged heat, and the weak aqua ammonia after heat exchange enters from the upper tower top of desorber, in desorber
Portion is provided with sieve plate, and liquid phase is contacted by sieve plate and carries out heat exchange.Continuous heating by low-pressure steam to weak aqua ammonia, it is dilute
Ammonia in ammoniacal liquor is resolved to become gas from upper top of tower out.From upper top of tower gas the inside main component out for water steams
Gas, simultaneously containing part gas ammonia and carbon dioxide, gas becomes liquid after out being exchanged heat into reflux condenser and recirculated water afterwards
Into level tank, the uncooled gas for getting off in part goes ordinary-pressure absorption tower further by weak aqua ammonia washing absorption.In level tank
Weak aqua ammonia by reflux pump pressurize after be transported to low pressure carbamate condenser, condensate liquid is eventually returned to urea high pressure system and is followed
Ring reacts.
Stripped by the heating of tower on desorber, the ammonia in weak aqua ammonia mostly becomes gas ammonia and gone out from tower top.Weak aqua ammonia
Flowed down along multistage sieve plate and finally accumulate in upper tower bottom, be connected with Hydrolysis Tower Feeding Pump in upper tower bottom outlet conduit, it is dilute
Ammoniacal liquor delivers into hydrolysis tower heat exchanger first after desorber feed pump pressurizes, with the high-temperature liquid from hydrolysis tower bottom out
Body is exchanged heat, and is entered from the top of hydrolysis tower after weak aqua ammonia heating.The effect of hydrolysis tower be exactly weak aqua ammonia inside urea
The heating of the middle pressure steam by being added from bottom of towe, urea is hydrolyzed change ammonification and carbon dioxide, and ammonia and carbon dioxide are with water
Steam out further participates in resolving reaction from the top of hydrolysis tower into the upper tower top of Analytic Tower together, so as to reach removal
Problem containing urea in weak aqua ammonia.
Exchanged heat by hydrolysis tower heat exchanger from hydrolysis tower bottom high-temp liquid out after lowering the temperature from the lower tower of desorber
Portion enters, and the heating medium of desorber is low-pressure steam, and low-pressure steam is entered by the Xia Ta bottoms of pipeline analytically tower, low pressure
Steam is stripped after entering tower with weak aqua ammonia counter current contacting, and the gas after stripping enters upper by the air rising hole between Shang Ta and lower tower
Tower is further stripped.Desorber heat exchanger and process condensate cooler are passed sequentially through from lower tower bottom liquid out
After heat exchange cooling, Desultwater Station is pumped into finally by process condensate.It is basic from lower tower bottom weak aqua ammonia the inside out
Urea and ammonia are not contained, as the equal ＜ 10ppm of urea and ammonia content in solution, liquid can be as process condensate to desalted water
Device is conveyed, and process condensate carries out conveying and uses eventually as desalted water to boiler.When urea and ammonia in process condensate
When content is more than 10ppm, process condensate is discharged on the spot.
The system exist problem be：
1st, the abnormal ammonia that can cause in ammonia vessel in weak aqua ammonia that is produced due to urea high pressure system or vapo(u)rization system and
Urea content raise, at this moment parse hydrolysis system may due to load it is heavier and cannot be the ammonia inside weak aqua ammonia and urea whole
Parse, the ammonia and urea content under desorber inside tower bottom process condensate out can exceed the control of 100ppm
Index, if exceeded process condensate is directly discharged on the spot can not only cause environmental pollution, while being also a kind of waste.
2nd, due to containing urea in weak aqua ammonia, there is stronger corrosiveness, even if the equipment and pipe of parsing hydrolysis system
Road is designed as stainless steel material, equipment and pipeline can also be caused than more serious corrosion in production process, this peace to production
Row for the national games causes hidden trouble.
Utility model content
In order to solve the above-mentioned technical problem, the utility model offer is a kind of avoids equipment corrosion, causes inside weak aqua ammonia
Ammonia and urea try one's best all parse urea parsing hydrolysis systems.
To achieve these goals, the technical solution of the utility model is as follows：A kind of urea parses hydrolysis system, including solution
Analysis tower and hydrolysis tower, the weak aqua ammonia from vapo(u)rization system enter ammonia vessel, and the weak aqua ammonia in the ammonia vessel is given by Analytic Tower
Material pump is exchanged heat into the high-temp liquid in Analytic Tower heat exchanger with tower bottom under Analytic Tower out, the weak aqua ammonia after heat exchange from
The top of the upper tower of Analytic Tower enters Analytic Tower, and weak aqua ammonia outlet line and the hydrolysis tower of the upper tower bottom of the Analytic Tower are fed
Pump is connected, and the bottom of the lower tower of the Analytic Tower is provided with low pressure steam pipe, and the outlet of the Hydrolysis Tower Feeding Pump passes through pipeline
Cold side import with hydrolysis tower heat exchanger is connected, and the hot side import of the hydrolysis tower heat exchanger is connected to the bottom high temperature of hydrolysis tower
Liquid outlet, the hot side outlet of the hydrolysis tower heat exchanger is connected with the weak aqua ammonia import of hydrolysis tower top, the top of the hydrolysis tower
Portion's ammonia and carbon dioxide outlet are connected with tower upper inlet on Analytic Tower, the cold side outlet port and Analytic Tower of the hydrolysis tower heat exchanger
Xia Ta tops be connected；It is characterized in that：The low pressure steam pipe is connected with air duct, sets free on the air duct
Throughput automatic regulating valve；The outlet of the Hydrolysis Tower Feeding Pump is connected by pipeline with tower top on Analytic Tower simultaneously, and
Hydrolysis Tower Feeding Pump is exported on the pipeline being connected with tower top on Analytic Tower and the pipeline being connected with hydrolysis tower heat exchanger respectively
It is provided with valve.
Using such scheme, while low-pressure steam is passed through to Analytic Tower, partial air is joined, add air
Amount valve regulation is automatically adjusted by air mass flow, the amount of addition is a few percent of low-pressure steam amount, to ensure safety.Air
As low-pressure steam enters each equipment after joining, fine and close diaphragm is produced on each stainless steel equipment surface, it is to avoid
The further corrosion of urea.The outlet of the Hydrolysis Tower Feeding Pump is connected by pipeline with tower top on Analytic Tower simultaneously, and
Hydrolysis Tower Feeding Pump is exported on the pipeline being connected with tower top on Analytic Tower and the pipeline being connected with hydrolysis tower heat exchanger respectively
Valve is provided with, so, underproof weak aqua ammonia can be allowed to return to Analytic Tower and further parsed, mitigate the solution of tower under Analytic Tower
Analysis load.
In such scheme：The cold side outlet port of the Analytic Tower heat exchanger is connected with process condensate cooler, the technique
The cold side outlet port of condensate liquid cooler is connected with the import of process condensate liquid pump, and the outlet of the process condensate liquid pump sets four
Branch pipe, one of branch pipe is connected to ammonia vessel.When the content of urea in the liquid of tower discharge under Analytic Tower is more than 100Ppm,
Liquid can be allowed to return to ammonia vessel, continue to parse, it is to avoid cause the pollution to environment, it is to avoid safety and environmental protection accident, allow weak aqua ammonia
In ammonia and urea all parse.
Beneficial effect：The utility model allows the surface of stainless steel equipment to form fine and close protection by increasing air line
Film, so as to play a part of to avoid equipment from being corroded by urea.By the improvement to pipeline, the urea and ammonia in weak aqua ammonia can be caused
All parse, it is to avoid cause the pollution to environment, it is to avoid safety and environmental protection accident.
Brief description of the drawings
Fig. 1 is process chart of the present utility model.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples：
Embodiment 1, as shown in Figure 1：Urea of the present utility model parses hydrolysis system by Analytic Tower 1, hydrolysis tower 2, ammoniacal liquor
Groove 3, Analytic Tower feed pump 4, Analytic Tower heat exchanger 5, Hydrolysis Tower Feeding Pump 6, hydrolysis tower heat exchanger 7, reflux condenser 8, liquid level
Groove 9, reflux pump 10, process condensate condenser 11, process condensate liquid pump 12, low pressure steam pipe 13, air duct 14, air stream
Amount automatic regulating valve 15, etc. part composition.
The structure of Analytic Tower 1 and hydrolysis tower 2 is prior art, will not be described here.Weak aqua ammonia from vapo(u)rization system
Into ammonia vessel 3, weak aqua ammonia in ammonia vessel 3 by Analytic Tower feed pump 4 enter in Analytic Tower heat exchanger 5 with Analytic Tower 1 under
Tower bottom high-temp liquid out is exchanged heat, the weak aqua ammonia after heat exchange analytically the upper tower of tower 1 top enter Analytic Tower 1,
In Analytic Tower 1, ammonia in weak aqua ammonia is resolved to become gas from upper top of tower out.From upper top of tower gas the inside out
Main component is vapor, and simultaneously containing part gas ammonia and carbon dioxide, gas out enters reflux condenser 8 and recirculated water afterwards
Become liquid into level tank 9 after heat exchange, the uncooled gas for getting off in part goes ordinary-pressure absorption tower further to be washed by weak aqua ammonia
Absorb.Weak aqua ammonia in level tank 9 is transported to low pressure carbamate condenser after reflux pump 10 pressurizes, and condensate liquid is eventually returned to
Urea high pressure system is circulated reaction.
The bottom of the lower tower of Analytic Tower 1 is provided with low pressure steam pipe 13, and low pressure steam pipe 13 is connected with air duct 14, empty
Air mass flow automatic regulating valve 15 is provided with feed channel 14.By adding a small amount of air, air is with low-pressure steam pipeline
13 flow to each equipment, form fine and close diaphragm on the surface of equipment, it is to avoid equipment corrosion.The upper tower bottom of Analytic Tower 1 it is dilute
Ammoniacal liquor outlet line is connected with Hydrolysis Tower Feeding Pump 6, and the outlet of Hydrolysis Tower Feeding Pump 6 is by pipeline and hydrolysis tower heat exchanger 7
Cold side import is connected, and the outlet of Hydrolysis Tower Feeding Pump 6 is connected by pipeline with tower top on Analytic Tower 1 simultaneously, and in hydrolysis tower
Feed pump 6 exports the pipeline being connected with tower top on Analytic Tower 1 and is respectively provided with the pipeline being connected with hydrolysis tower heat exchanger
There is valve.
The hot side import of hydrolysis tower heat exchanger 7 is connected to the bottom high-temp liquid outlet of hydrolysis tower 2, hydrolysis tower heat exchanger 7
Hot side outlet be connected with the top weak aqua ammonia import of hydrolysis tower 2, on the top ammonia and carbon dioxide outlet of hydrolysis tower 2 and Analytic Tower
The upper inlet of tower is connected, and the cold side outlet port of hydrolysis tower heat exchanger 7 is connected with the Xia Ta tops of Analytic Tower 1.Analytic Tower heat exchanger 5
Cold side outlet port be connected with process condensate cooler 11, the cold side outlet port of process condensate cooler 11 and process condensate liquid pump
12 import is connected, and the outlet of process condensate liquid pump 12 sets four branch pipes, and one of branch pipe is connected to ammonia vessel 3, when going out
When the content of ammonia and urea in the process condensate for coming is more than 100ppmm, ammonia vessel 3 is returned to.Four the other threes of branch pipe
Desultwater Station, meeting circulation is returned respectively to be discharged as recirculated water and on the spot.
The utility model is not limited to above-described embodiment, it will be appreciated that one of ordinary skill in the art is without creative
Work just can make many modifications and variations according to design of the present utility model.All technical staff in the art are according to this reality
Pass through the available technical side of logical analysis, reasoning, or a limited experiment on the basis of existing technology with new design
Case, all should be in the protection domain being defined in the patent claims.
Claims (2)
1. a kind of urea parses hydrolysis system, including Analytic Tower (1) and hydrolysis tower (2), and the weak aqua ammonia from vapo(u)rization system enters
Ammonia vessel (3), weak aqua ammonia in the ammonia vessel (3) by Analytic Tower feed pump (4) enter in Analytic Tower heat exchanger (5) with solution
Tower bottom high-temp liquid out is exchanged heat under analysis tower (1), and the top of the analytically upper tower of tower (1) of the weak aqua ammonia after heat exchange is entered
Enter Analytic Tower (1), the weak aqua ammonia outlet line of the upper tower bottom of the Analytic Tower (1) is connected with Hydrolysis Tower Feeding Pump (6), described
The bottom of the lower tower of Analytic Tower (1) is provided with low pressure steam pipe (13), the outlet of the Hydrolysis Tower Feeding Pump (6) by pipeline with
The cold side import of hydrolysis tower heat exchanger (7) is connected, and the hot side import of the hydrolysis tower heat exchanger (7) is connected to hydrolysis tower (2)
Bottom high-temp liquid outlet, the hot side outlet of the hydrolysis tower heat exchanger (7) is connected with hydrolysis tower (2) top weak aqua ammonia import,
The top ammonia and carbon dioxide outlet of the hydrolysis tower (2) are connected with tower upper inlet on Analytic Tower, the hydrolysis tower heat exchanger
(7) cold side outlet port is connected with the Xia Ta tops of Analytic Tower (1)；It is characterized in that：The low pressure steam pipe (13) and air hose
Road (14) is connected, and air mass flow automatic regulating valve (15) is provided with the air duct (14)；The Hydrolysis Tower Feeding Pump (6)
Outlet simultaneously be connected with tower top on Analytic Tower (1) by pipeline, and Hydrolysis Tower Feeding Pump (6) export and Analytic Tower (1)
Valve is respectively arranged with the connected pipeline in upper tower top and the pipeline being connected with hydrolysis tower heat exchanger.
2. urea parses hydrolysis system according to claim 1, it is characterised in that：The cold side of the Analytic Tower heat exchanger (5)
Outlet is connected with process condensate cooler (11), the cold side outlet port and process condensate of the process condensate cooler (11)
The import of pump (12) is connected, and the outlet of the process condensate liquid pump (12) sets four branch pipes, and one of branch pipe is connected to ammonia
Tank (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621197464.7U CN206244451U (en) | 2016-11-07 | 2016-11-07 | Urea parses hydrolysis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621197464.7U CN206244451U (en) | 2016-11-07 | 2016-11-07 | Urea parses hydrolysis system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206244451U true CN206244451U (en) | 2017-06-13 |
Family
ID=58999986
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621197464.7U Active CN206244451U (en) | 2016-11-07 | 2016-11-07 | Urea parses hydrolysis system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206244451U (en) |
-
2016
- 2016-11-07 CN CN201621197464.7U patent/CN206244451U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN207112362U (en) | Avoid the nitrogen fertilizer plant high-pressure carbon dioxide blowdown system of line clogging | |
| CN205307829U (en) | Energy -conserving urea vaporization system | |
| CN109438251A (en) | A kind of methanol vapor phase catalytic ammoniation method prepares the method and device thereof of trimethylamine | |
| CN105026365A (en) | Urea synthesis process and plant | |
| CN109319736B (en) | Ammonia tank purge gas recovery device and process thereof | |
| CN214114973U (en) | CO conversion condensate refining process system | |
| CN204661587U (en) | A kind of energy-saving carbamide production system | |
| CN206244451U (en) | Urea parses hydrolysis system | |
| CN203307083U (en) | Negative pressure ammonia distiller by using raw gas waste heat as heat source | |
| CN220070763U (en) | Device for separating high-purity hydrogen chloride from byproduct hydrogen chloride of sucralose | |
| CN217323421U (en) | Negative pressure ammonia distillation system for low-grade energy utilization of coking plant | |
| CN207108722U (en) | Synthesize ammonia Desalting Water System | |
| CN107129836B (en) | Ammonia nitrogen removal device and method based on coal gas gasification and desulfurization unit of integrated gasification combined cycle power generation technology | |
| CN216236327U (en) | Ammonia nitrogen recovery device for resin regeneration wastewater of power plant fine treatment system | |
| CN211159192U (en) | Processing apparatus of acid water is retrieved to claus sulphur | |
| CN209411795U (en) | A kind of ammonia decontamination system | |
| CN220589496U (en) | Ammonia synthesis flash steam recovery device | |
| CN108328843B (en) | Positive and negative pressure integrated high-efficiency deamination system and treatment recovery process thereof | |
| CN206706040U (en) | A kind of ammonia nitrogen removal device based on integral gasification combined circulation technology gas gasification and desulfurization unit | |
| CN207307614U (en) | A kind of coking ammonia water concentrate removal of impurities is used for equipment for denitrifying flue gas | |
| CN109957427A (en) | A kind of insulation fix bed methanation of pyrolysis gas of biomass and decarburization process for upgrading | |
| CN218853480U (en) | Urea production system for comprehensively utilizing waste heat of steam condensate | |
| CN216756375U (en) | Energy-saving or yield-increasing and consumption-reducing methanol synthesis device | |
| CN209411796U (en) | A kind of ammonia decontamination tower | |
| CN214218237U (en) | Vacuum condensate distillation processing apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |