CN206244451U - Urea parses hydrolysis system - Google Patents

Urea parses hydrolysis system Download PDF

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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
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tower
hydrolysis
ammonia
analytic
urea
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李炜
张�杰
冉红洋
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Sinochem Fuling Chongqing Chemical Industry Co Ltd
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Sinochem Fuling Chongqing Chemical Industry Co Ltd
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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

Urea parses hydrolysis system
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).
CN201621197464.7U 2016-11-07 2016-11-07 Urea parses hydrolysis system Active CN206244451U (en)

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Application Number Priority Date Filing Date Title
CN201621197464.7U CN206244451U (en) 2016-11-07 2016-11-07 Urea parses hydrolysis system

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Application Number Priority Date Filing Date Title
CN201621197464.7U CN206244451U (en) 2016-11-07 2016-11-07 Urea parses hydrolysis system

Publications (1)

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