CN104089184B - It is a kind of to prevent the corrosion of urea feed-line and the method and apparatus for crystallizing in the production of urea ammonium nitrate solution - Google Patents
It is a kind of to prevent the corrosion of urea feed-line and the method and apparatus for crystallizing in the production of urea ammonium nitrate solution Download PDFInfo
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- CN104089184B CN104089184B CN201410292313.9A CN201410292313A CN104089184B CN 104089184 B CN104089184 B CN 104089184B CN 201410292313 A CN201410292313 A CN 201410292313A CN 104089184 B CN104089184 B CN 104089184B
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- ammonium nitrate
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- 239000004202 carbamide Substances 0.000 title claims abstract description 102
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 101
- CSGLCWIAEFNDIL-UHFFFAOYSA-O azanium;urea;nitrate Chemical compound [NH4+].NC(N)=O.[O-][N+]([O-])=O CSGLCWIAEFNDIL-UHFFFAOYSA-O 0.000 title claims abstract description 40
- 238000005260 corrosion Methods 0.000 title claims abstract description 37
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 230000007797 corrosion Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 33
- 238000003860 storage Methods 0.000 claims abstract description 32
- 238000009413 insulation Methods 0.000 claims abstract description 27
- 238000010926 purge Methods 0.000 claims abstract description 22
- 238000002425 crystallisation Methods 0.000 claims abstract description 18
- 230000008025 crystallization Effects 0.000 claims abstract description 18
- 239000000243 solution Substances 0.000 claims description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 32
- 238000002347 injection Methods 0.000 claims description 13
- 239000007924 injection Substances 0.000 claims description 13
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000003628 erosive effect Effects 0.000 claims description 2
- 210000002700 urine Anatomy 0.000 claims description 2
- 238000011084 recovery Methods 0.000 abstract description 2
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 6
- 206010037544 Purging Diseases 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 229910001220 stainless steel Inorganic materials 0.000 description 5
- 150000003863 ammonium salts Chemical class 0.000 description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 4
- 239000012266 salt solution Substances 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000010025 steaming Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- PAWQVTBBRAZDMG-UHFFFAOYSA-N 2-(3-bromo-2-fluorophenyl)acetic acid Chemical compound OC(=O)CC1=CC=CC(Br)=C1F PAWQVTBBRAZDMG-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- -1 iron ion Chemical class 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- YOWAEZWWQFSEJD-UHFFFAOYSA-N quinoxalin-2-amine Chemical compound C1=CC=CC2=NC(N)=CN=C21 YOWAEZWWQFSEJD-UHFFFAOYSA-N 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Gas Separation By Absorption (AREA)
Abstract
The present invention provides a kind of method and apparatus of the corrosion of urea feed-line and crystallization in preventing urea ammonium nitrate solution from producing, and the method includes that insulation jacket will be arranged outside feed-line preheats to feed-line；Transport urea solution again；Then purge steam and blow back in urea storage tank the urea liquid in feed-line；Anti-corrosion air is passed through again forms air conservation layer in the inwall of feed-line；Last release.The present invention solves the easy Crystallization Plugging of urea feed-line and the phenomenon corroded in the production of urea ammonium nitrate solution groove.And loss can be reduced with urea in recovery line, reduce consumption.
Description
Technical field
The present invention relates to chemical production technical field, and in particular to urea is conveyed during one kind prevents urea ammonium nitrate solution from producing
Pipeline corrosion and the method and apparatus of crystallization.
Background technology
Urea ammonium nitrate solution（Urea Ammonium Nitrate solution）, abbreviation UAN solution, typically by one
The liquid area and liquid ammonium nitrate for determining concentration are mixed to get different grades of product, and wherein urea liquid is mainly from urea life
The liquid area in device is produced, its concentration is between 70-85%.
In actual production process, UAN and urea production are two sets of production equipments, usually produce urea plant
Urea liquid remote conveying is sent to UAN productions prepares region carries out producing UAN works again the urea liquid delivery pipe, it is necessary to more long
Line；And urea liquid tool low temperature crystallization and the characteristic of pyrolytic corrosive substance, easily block or corroded pipeline.
Urea liquid it is general less than 70 DEG C can Crystallization Plugging pipeline, so feed-line needs tracing thermal-insulating or chuck to protect
Temperature so that solution temperature is maintained at 100 DEG C or so, can avoid the generation of crystallization.
And the corrosivity of urea liquid is the accessory substance aminoquinoxaline produced by pyrolytic（Abbreviation first ammonium）Material,
This material reacts with hardware or pipeline, even the stainless steel of the different size material such as 304,304L or 316L,
Different degrees of corrosion will occur.The corrosion of urea lines is that, because first ammonium reacts with the iron of metal pipe line, generation is yellow
The iron ion of color.Corrosion for a long time makes the tube wall of metal pipe line thinning, and then pipeline can occur corrosion failure, weld seam leakage etc.,
Cause greater loss.So, urea industry production equipment is producing methylamine typically from stainless steels such as 304L or 316L
Environment, when being provided simultaneously with HTHP again, its equipment and pipeline corrosion aggravate, typically can by add anticorrosion air,
Reduce temperature, pressure or the methods such as flushing that add water are solved.Air is added in stainless steel equipment or pipeline, oxide-film can be formed,
Substantially reduce corrosion rate.
The content of the invention
The present invention is in order to solve the above problems, there is provided urea feed-line corrodes during one kind prevents urea ammonium nitrate solution from producing
With the method and apparatus of crystallization, so as to solve the perishable phenomenon with Crystallization Plugging of urea feed-line in UAN productions.
The first object of the present invention is to provide the corrosion of urea feed-line and knot during one kind prevents urea ammonium nitrate solution from producing
Brilliant method, comprises the following steps：
（1）To connect between the urea storage tank and the urea ammonium nitrate solution groove of urea ammonium nitrate solution production district in urea production area
Feed-line outside be arranged insulation jacket, and feed-line is preheated to steam is passed through in insulation jacket；
（2）Open delivery pump and the urea liquid in urea storage tank is transported to urea nitre by the feed-line after preheated
In ammonium salt solution groove；
（3）After urea liquid has been conveyed, it is passed through from the root valve on the feed-line of urea ammonium nitrate solution groove one end
Purge steam, pressure is 0.6-1MPa, temperature is purged steam for 150-160 DEG C, and the urea liquid in feed-line is blown back
In urea storage tank, untill the showering guilding valve discharge steam on the feed-line positioned at urea storage tank one end；
（4）The anti-corrosion air at least 30 minutes that pressure is 0.3-0.6MPa is passed through in from root valve to feed-line, defeated
The inwall of pipeline is sent to form air conservation layer；
（5）Release is carried out to feed-line.
Further, also, when producing crystallization in feed-line or needing cleaning, led from root valve including hot water injection's step
Enter the hot water injection's feed-line not less than 100 DEG C.
Preferably, the step（1）In steam pressure for 0.2-0.4MPa, temperature be 130-145 DEG C.
Preferably, the step（1）In middle insulation jacket a steam inlet valve and one are respectively set every 50-70 meters one section
Individual condensed water outlet valve.
The first object of the present invention be to provide one kind realize it is above-mentioned prevent urea ammonium nitrate solution produce in urea feed-line
Primary transfer line between the equipment of the method for corrosion and crystallization, including connection urea storage tank and urea ammonium nitrate solution groove, it is described
The outlet at bottom end of urea storage tank is provided with delivery pump, top entry end and is connected with auxiliary feed-line；The primary transfer line difference
It is connected with delivery pump, auxiliary feed-line, insulation jacket is arranged outside the main and auxiliary feed-line, the insulation jacket is provided with
Steam inlet valve and condensed water outlet valve；Primary transfer line positioned at urea ammonium nitrate solution groove arrival end is provided with inlet valve, described
The arrival end of inlet valve is provided with root valve；The root valve is connected to the pipe that purges steam, anti-corrosion air hose and hot water injection
Pipe, the pipe that purges steam, anti-corrosion air hose and hot water injection Guan Shangjun have valve and check (non-return) valve.
Further scheme is that check valve is provided between the primary transfer line and delivery pump, primary transfer line and auxiliary conveying
Return valve is provided between pipeline.
Further scheme is that the primary transfer line is provided with thermometer and the second showering guilding valve, the import of the root valve
End is respectively equipped with the first showering guilding valve and pressure gauge.
Insulation jacket is all arranged outside feed-line of the invention, is 0.2-0.4MPa, 130-145 DEG C of steaming of temperature with pressure
Vapour is preheated to feed-line.If vapor (steam) temperature is less than 130 DEG C, steaming solution is condensed into water, is unfavorable for feed-line
Insulation；If temperature is too low, urea lines solution is easily crystallized.Other steam pressure and temperature be not easy to it is too high, it is too high easily
Cause urea to decompose pipeline corrosion to aggravate.
Set root valve in the entrance point of the inlet valve of urea ammonium nitrate solution groove, root valve respectively with pipe, the anti-corrosion of purging steam
Air hose and hot water injection's pipe are connected.Be equipped with valve and check (non-return) valve on these three pipelines, valve be for pipeline unlatching or
Close；The effect of check (non-return) valve is to prevent from concentrating the material in pipeline mutually to alter, and the pressure of three kinds of materials should be greater than in pipeline urea just
Often pressure during operation, can be pushed back in storage tank urea with guarantee.
The effect of pipe of purging steam is begun to use after feed-line transport urea terminates, by what is remained in feed-line
Urea liquid purging force feed is returned in urea storage tank, can reclaim urea in feed-line, reduces loss, reduces consumption.To continuous
The product quality for preparing production accomplishes powerful guarantee；
Anti-corrosion air hose after the effective complete urea liquid of steam blowing force feed that purges steam, be passed through a small amount of air, pipe
Air conservation layer is formed in line.It is thin that oxygen in air can generate one layer of thin oxidation in stainless steel tubing inwall, reduces conveying
The corrosion of pipeline occurs；
The effect of hot water injection's pipe is the flushing that added water when pipeline occurs slight crystallization so that urea dissolves, and is prevented completely
The possibility of blocking；Also one effect is cleaning displacement pipeline.
Thermometer on feed-line is that observation temperature is indicated, and judges whether pipeline crystallizes；Pressure gauge effect is pipeline root
Portion's valve is opened, and after being passed through a kind of material of steam or air or flushing water, pressure gauge indicates pressure reduction, illustrates that pipeline is unimpeded just
Often.
So beneficial effects of the present invention have：
1st, present invention design solves the phenomenon of the easy Crystallization Plugging of urea feed-line in the production of urea ammonium nitrate solution groove.It is defeated
Send pipeline to use pressure to be designed for 0.2-0.4MPa, 130-145 DEG C of low-pressure steam jacket heat-preservation of temperature, reduce urea and decompose band
The side reaction for coming, improve product quality.
2nd, urea liquid in feed-line is pushed back urine storage element groove using being purged steam, can be subtracted with urea in recovery line
Few loss, reduces consumption；Powerful guarantee is accomplished to the continuous product quality for preparing production.
3rd, feed-line is rinsed using hot water, urea crystals can be prevented, prevent urea long-time in-line
Accumulate and decompose, prevent corrosion of the ureaclastic methylamine to pipeline；And convenient cleaning feed-line.
4th, by the addition of air, the corrosion of feed-line is reduced.
5th, two showering guilding valves can prevent feed-line from overstocking, and prevent corruption of the methylamine to stainless steel at high temperature under high pressure
Erosion.
Brief description of the drawings
Fig. 1 is the schematic diagram of present device；
In figure：1- urea storage tanks, 2- delivery pumps, 3- primary transfer lines, the auxiliary feed-lines of 4-, 5- insulation jackets, 6- temperature
Table, 7- pressure gauges, 8- urea ammonium nitrate solution grooves, 9-1 check valves, 9-2 return valves, the showering guilding valves of 9-3 second, the showering guilding valves of 9-4 first,
9-5 steam inlet valves, 9-6 condensed water outlet valves, 9-7 inlet valves, 9-8 root valves, 9-9 valves, 9-10 check (non-return) valves；10- purgings steam
Steam pipe, 11- hot water injections pipe, 12 anti-corrosion air hoses.
Specific embodiment
Embodiment one：
A kind of method for preventing the corrosion of urea feed-line and crystallization in the production of urea ammonium nitrate solution, comprises the following steps：
（1）To connect between the urea storage tank and the urea ammonium nitrate solution groove of urea ammonium nitrate solution production district in urea production area
Feed-line outside be arranged insulation jacket, a steam inlet valve and a condensed water outlet are respectively set in insulation jacket every 70 meters
Valve, from steam inlet valve to insulation jacket in be passed through pressure for 0.2MPa, the steam that temperature is 130 DEG C feed-line is carried out it is pre-
Heat；
（2）Open delivery pump and the urea liquid in urea storage tank is transported to urea nitre by the feed-line after preheated
In ammonium salt solution groove；
（3）After urea liquid has been conveyed, it is passed through from the root valve on the feed-line of urea ammonium nitrate solution groove one end
Purge steam, pressure is 0.6MPa, temperature is 150 DEG C and purges steam, and the urea liquid in feed-line is blown back into urea storage
In tank, untill the showering guilding valve discharge steam on the feed-line positioned at urea storage tank one end；
（4）The anti-corrosion air 30 minutes that pressure is 0.3MPa is passed through in from root valve to feed-line, in feed-line
Inwall forms air conservation layer；
（5）Release is carried out to feed-line.
Embodiment two：
A kind of method for preventing the corrosion of urea feed-line and crystallization in the production of urea ammonium nitrate solution, comprises the following steps：
（1）To connect between the urea storage tank and the urea ammonium nitrate solution groove of urea ammonium nitrate solution production district in urea production area
Feed-line outside be arranged insulation jacket, a steam inlet valve and a condensed water outlet are respectively set in insulation jacket every 50 meters
Valve, from steam inlet valve to insulation jacket in be passed through pressure for 0.4MPa, the steam that temperature is 145 DEG C feed-line is carried out it is pre-
Heat；
（2）Open delivery pump and the urea liquid in urea storage tank is transported to urea nitre by the feed-line after preheated
In ammonium salt solution groove；
（3）After urea liquid has been conveyed, it is passed through from the root valve on the feed-line of urea ammonium nitrate solution groove one end
Purge steam, pressure is 1MPa, temperature is 160 DEG C and purges steam, and the urea liquid in feed-line is blown back into urea storage tank
It is interior, untill the showering guilding valve discharge steam on the feed-line positioned at urea storage tank one end；
（4）The anti-corrosion air 40 minutes that pressure is 0.6MPa is passed through in from root valve to feed-line, in feed-line
Inwall forms air conservation layer；When slight crystallization is produced in feed-line, the hot water imported not less than 100 DEG C from root valve is rushed
Wash feed-line.
（5）Release is carried out to feed-line.
Embodiment three：
A kind of method for preventing the corrosion of urea feed-line and crystallization in the production of urea ammonium nitrate solution, comprises the following steps：
（1）To connect between the urea storage tank and the urea ammonium nitrate solution groove of urea ammonium nitrate solution production district in urea production area
Feed-line outside be arranged insulation jacket, a steam inlet valve and a condensed water outlet are respectively set in insulation jacket every 60 meters
Valve, from steam inlet valve to insulation jacket in be passed through pressure for 0.3MPa, the steam that temperature is 140 DEG C feed-line is carried out it is pre-
Heat；
（2）Open delivery pump and the urea liquid in urea storage tank is transported to urea nitre by the feed-line after preheated
In ammonium salt solution groove；
（3）After urea liquid has been conveyed, it is passed through from the root valve on the feed-line of urea ammonium nitrate solution groove one end
Purge steam, pressure is 0.8MPa, temperature is 155 DEG C and purges steam, and the urea liquid in feed-line is blown back into urea storage
In tank, untill the showering guilding valve discharge steam on the feed-line positioned at urea storage tank one end；
（4）The anti-corrosion air 60 minutes that pressure is 0.45MPa is passed through in from root valve to feed-line, in feed-line
Inwall forms air conservation layer；When cleaning is needed in feed-line, from root valve, hot water injection of the importing not less than 100 DEG C is defeated
Send pipeline；
（5）Release is carried out to feed-line.
Example IV：
Primary transfer line 3 between connection urea storage tank 1 and urea ammonium nitrate solution groove 8, the bottom of the urea storage tank 1 goes out
Mouth end is provided with delivery pump 2, top entry end and is connected with auxiliary feed-line 4；The primary transfer line 3 respectively with delivery pump 2, auxiliary defeated
Send pipeline 4 to connect, be provided with check valve 9-1 between primary transfer line 3 and delivery pump 2, primary transfer line 3 and auxiliary feed-line 4 it
Between be provided with return valve 9-2.Insulation jacket 5 is arranged outside the main and auxiliary feed-line, the insulation jacket 5 is provided with steam and enters
Steam valve 9-5 and condensed water outlet valve 9-6；Primary transfer line 3 positioned at the arrival end of urea ammonium nitrate solution groove 8 is provided with inlet valve 9-7,
The arrival end of the inlet valve 9-7 is provided with root valve 9-8；It is empty that the root valve 9-8 is connected to the pipe 10, anti-corrosion that purges steam
Tracheae 12 and hot water injection's pipe 11, have valve 9-9 on the pipe 10 that purges steam, anti-corrosion air hose 12 and hot water injection's pipe 11
With check (non-return) valve 9-10.
Further scheme is that the primary transfer line 3 is provided with thermometer 6 and second showering guilding valve 9-3, the root valve 9-
8 entrance point is respectively equipped with the first showering guilding valve 9-4 and pressure gauge 7.
In order to the urea liquid ensured in feed-line will not be crystallized, a steaming is respectively set in insulation jacket 5 every 50-70 meters
A vapour inlet valve 9-5 and condensed water outlet valve 9-6.
The course of work of the equipment of the present embodiment is as follows：
（1）Before feed-line transport urea, open insulation jacket on all steam inlet valves and condensed water outlet valve, to master,
Auxiliary feed-line is preheated；
（2）It is then turned on delivery pump and the urea liquid in urea storage tank is delivered into urea ammonium nitrate solution groove through primary transfer line
In；
（3）After the completion of urea liquid conveying, return valve and root valve are opened, and open the valve purged steam on pipe, to
Steam is passed through in feed-line, the urea liquid remained in primary transfer line is blown back into urea through return valve, auxiliary feed-line stores up
In tank；After purging a period of time, the second showering guilding valve is opened, steam is discharged such as at the second showering guilding valve, then explanation purging is qualified, together
When close the second showering guilding valve with the valve purged steam on pipe；
（4）Then the valve on anti-corrosion air hose is opened, to air is passed through in feed-line, the oxygen in air is stainless
The one layer of thin oxidation of generation of steel pipeline inwall is thin, reduces feed-line and corrodes；
（5）It is passed through after air terminates, opens the first showering guilding valve and the second showering guilding valve, pressure in the main and auxiliary feed-line of removal,
Prevent from forming HTHP, produce corrosion.
（6）Observation thermometer is indicated, and judges whether feed-line crystallizes；As have in main and auxiliary feed-line slight crystallization or
When needing cleaning, then the first showering guilding valve is first opened, when hot water temperature to be discharged reaches more than 100 DEG C, opened on hot water injection's pipe
Valve, feed-line is rinsed.
Above example is not limited only to protection scope of the present invention, all to be repaiied based on basic thought of the invention
What is changed or change belongs to protection scope of the present invention.
Claims (6)
- It is 1. a kind of to prevent the corrosion of urea feed-line and the method for crystallizing in the production of urea ammonium nitrate solution, it is characterised in that：Including Following steps：（1）To connect defeated between the urea storage tank and the urea ammonium nitrate solution groove of urea ammonium nitrate solution production district in urea production area Send and insulation jacket is arranged outside pipeline, and feed-line is preheated to steam is passed through in insulation jacket；（2）Opening delivery pump, that urea liquid in urea storage tank is transported into urea ammonium nitrate by the feed-line after preheated is molten In liquid bath；（3）After urea liquid has been conveyed, pressure is passed through from the root valve on the feed-line of urea ammonium nitrate solution groove one end For 0.6-1MPa, temperature purge steam for 150-160 DEG C, the urea liquid in feed-line is blown back in urea storage tank, directly To the showering guilding valve discharge steam on the feed-line of urea storage tank one end；（4）The anti-corrosion air at least 30 minutes that pressure is 0.3-0.6MPa is passed through in from root valve to feed-line, in delivery pipe The inwall of line forms air conservation layer；（5）Compare the thermometer located at feed-line two ends by observation to judge whether feed-line crystallizes, work as feed-line When interior generation is crystallized or needs cleaning, the hot water injection's feed-line not less than 100 DEG C is imported from root valve；（6）Release is carried out to feed-line.
- 2. method according to claim 1, it is characterised in that：The step（1）In steam pressure for 0.2-0.4MPa, Temperature is 130-145 DEG C.
- 3. method according to claim 1, it is characterised in that：The step（1）Every 50-70 meters one in middle insulation jacket Section respectively sets a steam inlet valve and a condensed water outlet valve.
- 4. it is a kind of realize as described in claim any one of 1-3 prevent urea ammonium nitrate solution from producing in urea feed-line it is rotten Primary transfer line between the equipment of the method for erosion and crystallization, including connection urea storage tank and urea ammonium nitrate solution groove, the urine The outlet at bottom end of plain storage tank is provided with delivery pump, top entry end and is connected with auxiliary feed-line；The primary transfer line respectively with Delivery pump, the connection of auxiliary feed-line, it is characterised in that：Insulation jacket, the thermal insulation clamp are arranged outside the main and auxiliary feed-line Put and be provided with steam inlet valve and condensed water outlet valve；Primary transfer line positioned at urea ammonium nitrate solution groove arrival end is provided with charging Valve, the arrival end of the inlet valve is provided with root valve；The root valve is connected to the pipe that purges steam, anti-corrosion air hose and heat Water flush pipe, the pipe that purges steam, anti-corrosion air hose and hot water injection Guan Shangjun have valve and check (non-return) valve.
- 5. equipment according to claim 4, it is characterised in that：It is provided with unidirectional between the primary transfer line and delivery pump Valve, return valve is provided between primary transfer line and auxiliary feed-line.
- 6. equipment according to claim 4, it is characterised in that：The primary transfer line is provided with thermometer and second and leads pouring Valve, the entrance point of the root valve is respectively equipped with the first showering guilding valve and pressure gauge.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410292313.9A CN104089184B (en) | 2014-06-26 | 2014-06-26 | It is a kind of to prevent the corrosion of urea feed-line and the method and apparatus for crystallizing in the production of urea ammonium nitrate solution |
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|---|---|---|---|
| CN201410292313.9A CN104089184B (en) | 2014-06-26 | 2014-06-26 | It is a kind of to prevent the corrosion of urea feed-line and the method and apparatus for crystallizing in the production of urea ammonium nitrate solution |
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| CN104089184B true CN104089184B (en) | 2017-06-20 |
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| CN108278490B (en) * | 2016-12-30 | 2024-02-20 | 贵港市芭田生态有限公司 | Anti-hardening agent conveying system and method |
| CN110479721B (en) * | 2018-05-15 | 2021-07-30 | 中石化广州工程有限公司 | Sump oil collecting system and method |
| CN110328200B (en) * | 2019-07-02 | 2024-04-23 | 河南开祥精细化工有限公司 | Pipeline deoiling system and method thereof |
| CN110899260A (en) * | 2019-11-29 | 2020-03-24 | 四川金象赛瑞化工股份有限公司 | Liquid material conveying device |
| CN111720741B (en) * | 2020-06-30 | 2022-04-22 | 中国神华能源股份有限公司国华电力分公司 | Urea solution conveying equipment |
| CN114321729A (en) * | 2021-12-16 | 2022-04-12 | 河南中电投华新电力工程有限公司 | Device and method for preventing crystallization in urea solution conveying process |
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| CN1325834A (en) * | 2000-05-25 | 2001-12-12 | 河南省骏马化工集团有限公司 | Long-distance delivery method and system for urine used to prepare urea-base compound fertilizer by spraying it |
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| CN102430551A (en) * | 2011-11-28 | 2012-05-02 | 安徽六国化工股份有限公司 | Descaling method for slurry conveyance pipeline of monoammonium phosphate drying tower by steam blowing |
| CN203336126U (en) * | 2013-07-04 | 2013-12-11 | 大唐国际发电股份有限公司陡河发电厂 | Heat tracing and washing system of urea solution conveying pipeline |
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| EP2653765B1 (en) * | 2012-04-20 | 2019-02-27 | TI Automotive (Heidelberg) GmbH | Pipe for a fluid to be warmed up |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325834A (en) * | 2000-05-25 | 2001-12-12 | 河南省骏马化工集团有限公司 | Long-distance delivery method and system for urine used to prepare urea-base compound fertilizer by spraying it |
| CN102046593A (en) * | 2008-04-02 | 2011-05-04 | 斯塔米卡邦有限公司 | Process for increasing the capacity of an existing urea plant |
| CN102430551A (en) * | 2011-11-28 | 2012-05-02 | 安徽六国化工股份有限公司 | Descaling method for slurry conveyance pipeline of monoammonium phosphate drying tower by steam blowing |
| CN203336126U (en) * | 2013-07-04 | 2013-12-11 | 大唐国际发电股份有限公司陡河发电厂 | Heat tracing and washing system of urea solution conveying pipeline |
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