CN104089184A - Method and device for preventing urea conveying pipeline from corrosion and crystallization in production of urea ammonium nitrate solution - Google Patents
Method and device for preventing urea conveying pipeline from corrosion and crystallization in production of urea ammonium nitrate solution Download PDFInfo
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- CN104089184A CN104089184A CN201410292313.9A CN201410292313A CN104089184A CN 104089184 A CN104089184 A CN 104089184A CN 201410292313 A CN201410292313 A CN 201410292313A CN 104089184 A CN104089184 A CN 104089184A
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- urea
- transfer line
- valve
- ammonium nitrate
- nitrate solution
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- 239000004202 carbamide Substances 0.000 title claims abstract description 100
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 98
- 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 44
- 238000002425 crystallisation Methods 0.000 title claims abstract description 26
- 230000008025 crystallization Effects 0.000 title claims abstract description 26
- 238000005260 corrosion Methods 0.000 title claims abstract description 25
- 230000007797 corrosion Effects 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000000243 solution Substances 0.000 claims description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 33
- 238000003860 storage Methods 0.000 claims description 32
- 239000007788 liquid Substances 0.000 claims description 31
- 238000009413 insulation Methods 0.000 claims description 26
- 238000010926 purge Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 16
- 239000007924 injection Substances 0.000 claims description 16
- 238000010992 reflux Methods 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 4
- 235000007164 Oryza sativa Nutrition 0.000 claims description 3
- 235000009566 rice Nutrition 0.000 claims description 3
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000007664 blowing Methods 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 7
- BAVYZALUXZFZLV-UHFFFAOYSA-N Methylamine Chemical compound NC BAVYZALUXZFZLV-UHFFFAOYSA-N 0.000 description 6
- 229910001220 stainless steel Inorganic materials 0.000 description 6
- 239000010935 stainless steel Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 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 2
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 241000209094 Oryza Species 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 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
- 238000004321 preservation Methods 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 241001311547 Patina Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct 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
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- -1 iron ion Chemical class 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
- 238000011084 recovery Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
Landscapes
- Gas Separation By Absorption (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Abstract
The invention provides a method and device for preventing a urea conveying pipeline from corrosion and crystallization in production of urea ammonium nitrate solution. The method comprises the following steps: preheating the conveying pipeline through a heat preserving jacket outside the conveying pipeline; conveying the urea solution; blowing steam to blow the urea solution from the conveying pipeline back to a urea storing tank; charging anticorrosive air to form an air protecting layer on the inner wall of the conveying pipeline; then releasing pressure. With the adoption of the method and device, the phenomenon that the urea conveying pipeline is easily crystallized and blocked and corroded during producing a urea ammonium nitrate solution groove can be avoided; in addition, urea in the pipeline can be recovered, thus the loss is reduced, and the consumption is decreased.
Description
Technical field
The present invention relates to chemical production technical field, be specifically related to a kind of prevent urea ammonium nitrate solution produce in the method and apparatus of urea transfer line corrosion and crystallization.
Background technique
Urea ammonium nitrate solution (Urea Ammonium Nitrate solution), be called for short UAN solution, generally be mixed to get the product of different brackets by certain density liquid area and liquid ammonium nitrate, wherein urea liquid is mainly from the liquid area in urea plant, and its concentration is between 70-85%.
In actual production process, UAN and urea production are two cover manufacturing mechanisms, are generally the urea liquid remote conveying of urea plant generation to be delivered to UAN production preparation region produce UAN work, urea liquid transfer line that need to be longer again; And the characteristic of urea liquid tool low temperature crystallization and pyrolysis corrosive material is easily stopped up or corroded pipeline.
Urea liquid generally lower than 70 DEG C can Crystallization Plugging pipeline, so transfer line needs tracing thermal-insulating or jacket heat-preservation, make solution temperature remain on 100 DEG C of left and right, can avoid the generation of crystallization.
And the corrosivity of urea liquid is by product aminoquinoxaline (the being called for short first ammonium) material because pyrolysis produces, this material and hardware or pipeline react, even, all can there is corrosion in various degree in 304, the stainless steel of the different size such as 304L or 316L material.The corrosion of urea lines is because the iron of first ammonium and metal pipe line reacts, and generates yellow iron ion.Long-time corrosion makes the tube wall attenuation of metal pipe line, and then corrosion failure, weld seam leakage etc. can occur pipeline, causes greater loss.So, urea industry manufacturing mechanism is generally selected the stainless steel such as 304L or 316L, and at the environment that produces methylamine, while possessing High Temperature High Pressure again simultaneously, its equipment and pipeline corrosion aggravation, generally can be by adding corrosion protection air, reducing the method solutions such as temperature, pressure or the flushing that adds water.In stainless steel equipment or pipeline, add air, can form patina, greatly reduce corrosion rate.
Summary of the invention
The present invention is in order to address the above problem, provide a kind of prevent urea ammonium nitrate solution produce in the method and apparatus of the corrosion of urea transfer line and crystallization, thereby solved the phenomenon of the perishable and Crystallization Plugging of urea transfer line during UAN produces.
The first object of the present invention be to provide a kind of prevent urea ammonium nitrate solution produce in the method for urea transfer line corrosion and crystallization, comprise the following steps:
(1) by the transfer line sheathed insulation jacket outward connecting between the urea storage tank in urea production district and the urea ammonium nitrate solution tank of urea ammonium nitrate solution production area, and to passing into steam in insulation jacket, transfer line is carried out to preheating;
(2) opening transfer pump is transported to the urea liquid in urea storage tank in urea ammonium nitrate solution tank by the transfer line after preheating;
(3) after urea liquid has been carried, pass into and purge steam from being positioned at root valve the transfer line of urea ammonium nitrate solution tank one end, pressure is 0.6-1MPa, temperature is 150-160 DEG C purging steam, urea liquid in transfer line is blown back in urea storage tank, until be positioned at the showering guilding valve exhaust steam on the transfer line of urea storage tank one end;
(4) the anticorrosion air at least 30 minutes that passes into pressure in from root valve to transfer line and be 0.3-0.6MPa, forms air conservation layer at the inwall of transfer line;
(5) transfer line is carried out to release.
Further, also comprise hot water injection's step, when producing crystallization in transfer line while maybe needing to clean, import the hot water injection's transfer line that is not less than 100 DEG C from root valve.
Preferably, the vapor pressure in described step (1) is that 0.2-0.4MPa, temperature are 130-145 DEG C.
Preferably, in described step (1), in insulation jacket, respectively establish a steam steam inlet valve and a condensed water outlet valve every one section, 50-70 rice.
The first object of the present invention be to provide a kind of realize above-mentioned prevent urea ammonium nitrate solution produce in the equipment of method of urea transfer line corrosion and crystallization, comprise the primary transfer line connecting between urea storage tank and urea ammonium nitrate solution tank, the bottom outlet end of described urea storage tank is provided with transfer pump, top entry end is connected with auxiliary transfer line; Described primary transfer line is connected with transfer pump, auxiliary transfer line respectively, described main and auxiliary transfer line equal sheathed insulation jacket outward, and described insulation jacket is provided with steam steam inlet valve and condensed water outlet valve; The primary transfer line that is positioned at urea ammonium nitrate solution tank entry end is provided with feeding valve, and the entry end of described feeding valve is provided with root valve; Described root valve is connected with respectively the pipe that purges steam, anticorrosion air duct and hot water injection's pipe, described in purge steam pipe, anticorrosion air duct and hot water injection Guan Shangjun have valve and check valve.
Further scheme is, between described primary transfer line and transfer pump, is provided with one-way valve, between primary transfer line and auxiliary transfer line, is provided with reflux valve.
Further scheme is, described primary transfer line is provided with thermometer and the second showering guilding valve, and the entrance point of described root valve is respectively equipped with the first showering guilding valve and pressure gauge.
The outer whole sheathed insulation jacket of transfer line of the present invention are that 0.2-0.4MPa, temperature 130-145 DEG C steam carries out preheating to transfer line with pressure.If vapor (steam) temperature is lower than 130 DEG C, steam solution is condensed into water, is unfavorable for the insulation of transfer line; If temperature is too low, the easy crystallization of urea lines solution.Vapor pressure and temperature are also difficult for too highly in addition, too highly easily cause urea decomposition pipeline corrosion aggravation.
Entrance point at the feeding valve of urea ammonium nitrate solution tank is established root valve, and root valve is managed and is connected with the pipe that purges steam, anticorrosion air duct and hot water injection respectively.On these three pipelines, be equipped with valve and check valve, valve is for the unlatching of pipeline or closes; The effect of check valve is to prevent from concentrating the material in pipeline to alter mutually, and the pressure of three kinds of materials should be greater than in pipeline pressure when urea normally moves, and urea can be pushed back in storage tank ensureing.
The effect of pipe of purging steam is to bring into use after transfer line transport urea finishes, and urea liquid residual in transfer line is purged to force feed and return in urea storage tank, can reclaim urea in transfer line, reduces the loss, and reduces and consumes.The quality of product that continuous preparation is produced is accomplished powerful guarantee;
Anticorrosion air duct purging steam after the complete urea liquid of effective steam blowing force feed, pass into a small amount of air, in-line forms air conservation layer.It is thin that airborne oxygen can generate at stainless steel pipeline inwall the oxidation that one deck is thin, and the corrosion that reduces transfer line occurs;
The effect of hot water injection's pipe is the flushing that adds water in the time that slight crystallization occurs pipeline, urea is dissolved, the possibility of stopping to stop up completely; Also having an effect is to clean displacement pipeline.
Thermometer on transfer line is to observe temperature instruction, judges whether crystallization of pipeline; Pressure gauge effect is that pipeline root valve is opened, and passes into after a kind of material of steam or air or sparge water, and pressure gauge indicated pressure reduces, and illustrates that pipeline is unimpeded normal.
So beneficial effect of the present invention has:
1, the present invention designs the phenomenon that has solved the easy Crystallization Plugging of urea transfer line in the production of urea ammonium nitrate solution tank.It is 0.2-0.4MPa, temperature 130-145 DEG C of low pressure steam jacket heat-preservation design that transfer line adopts pressure, has reduced the side reaction that urea decomposition brings, and improves the quality of products.
2, adopt to purge steam urea liquid in transfer line pushed back to urine storage element groove, can recovery line in urea, reduce the loss, reduce and consume; The quality of product that continuous preparation is produced is accomplished powerful guarantee.
3, adopt hot water to rinse transfer line, can prevent urea crystals, prevent that the long-time in-line of urea from accumulating decomposition, prevents the corrosion of ureaclastic methylamine to pipeline; And the convenient transfer line that cleans.
4, by the adding of air, reduced the corrosion of transfer line.
5, two showering guilding valves can prevent that transfer line from overstocking, and prevents the corrosion of methylamine to stainless steel under High Temperature High Pressure.
Brief description of the drawings
Fig. 1 is the schematic diagram of present device;
In figure: 1-urea storage tank, 2-transfer pump, 3-primary transfer line, the auxiliary transfer line of 4-, 5-insulation jacket, 6-thermometer, 7-pressure gauge, 8-urea ammonium nitrate solution tank, 9-1 one-way valve, 9-2 reflux valve, 9-3 the second showering guilding valve, 9-4 the first showering guilding valve, 9-5 steam steam inlet valve, 9-6 condensed water outlet valve, 9-7 feeding valve, 9-8 root valve, 9-9 valve, 9-10 check valve; The 10-pipe that purges steam, 11-hot water injection pipe, 12 anticorrosion air ducts.
Embodiment
Embodiment one:
Prevent urea ammonium nitrate solution produce in the method for urea transfer line corrosion and crystallization, comprise the following steps:
(1) by the outer sheathed insulation jacket of transfer line connecting between the urea storage tank in urea production district and the urea ammonium nitrate solution tank of urea ammonium nitrate solution production area, in insulation jacket, respectively establish a steam steam inlet valve and a condensed water outlet valve every 70 meters, the steam that passes into pressure in from steam steam inlet valve to insulation jacket and be 0.2MPa, temperature and be 130 DEG C carries out preheating to transfer line;
(2) opening transfer pump is transported to the urea liquid in urea storage tank in urea ammonium nitrate solution tank by the transfer line after preheating;
(3) after urea liquid has been carried, pass into and purge steam from being positioned at root valve the transfer line of urea ammonium nitrate solution tank one end, pressure is 0.6MPa, temperature is 150 DEG C purging steam, urea liquid in transfer line is blown back in urea storage tank, until be positioned at the showering guilding valve exhaust steam on the transfer line of urea storage tank one end;
(4) the anticorrosion air 30 minutes that passes into pressure in from root valve to transfer line and be 0.3MPa, forms air conservation layer at the inwall of transfer line;
(5) transfer line is carried out to release.
Embodiment two:
Prevent urea ammonium nitrate solution produce in the method for urea transfer line corrosion and crystallization, comprise the following steps:
(1) by the outer sheathed insulation jacket of transfer line connecting between the urea storage tank in urea production district and the urea ammonium nitrate solution tank of urea ammonium nitrate solution production area, in insulation jacket, respectively establish a steam steam inlet valve and a condensed water outlet valve every 50 meters, the steam that passes into pressure in from steam steam inlet valve to insulation jacket and be 0.4MPa, temperature and be 145 DEG C carries out preheating to transfer line;
(2) opening transfer pump is transported to the urea liquid in urea storage tank in urea ammonium nitrate solution tank by the transfer line after preheating;
(3) after urea liquid has been carried, pass into and purge steam from being positioned at root valve the transfer line of urea ammonium nitrate solution tank one end, pressure is 1MPa, temperature is 160 DEG C purging steam, urea liquid in transfer line is blown back in urea storage tank, until be positioned at the showering guilding valve exhaust steam on the transfer line of urea storage tank one end;
(4) the anticorrosion air 40 minutes that passes into pressure in from root valve to transfer line and be 0.6MPa, forms air conservation layer at the inwall of transfer line; In the time producing slight crystallization in transfer line, import the hot water injection's transfer line that is not less than 100 DEG C from root valve.
(5) transfer line is carried out to release.
Embodiment three:
Prevent urea ammonium nitrate solution produce in the method for urea transfer line corrosion and crystallization, comprise the following steps:
(1) by the outer sheathed insulation jacket of transfer line connecting between the urea storage tank in urea production district and the urea ammonium nitrate solution tank of urea ammonium nitrate solution production area, in insulation jacket, respectively establish a steam steam inlet valve and a condensed water outlet valve every 60 meters, the steam that passes into pressure in from steam steam inlet valve to insulation jacket and be 0.3MPa, temperature and be 140 DEG C carries out preheating to transfer line;
(2) opening transfer pump is transported to the urea liquid in urea storage tank in urea ammonium nitrate solution tank by the transfer line after preheating;
(3) after urea liquid has been carried, pass into and purge steam from being positioned at root valve the transfer line of urea ammonium nitrate solution tank one end, pressure is 0.8MPa, temperature is 155 DEG C purging steam, urea liquid in transfer line is blown back in urea storage tank, until be positioned at the showering guilding valve exhaust steam on the transfer line of urea storage tank one end;
(4) the anticorrosion air 60 minutes that passes into pressure in from root valve to transfer line and be 0.45MPa, forms air conservation layer at the inwall of transfer line; In the time needing to clean in transfer line, import the hot water injection's transfer line that is not less than 100 DEG C from root valve;
(5) transfer line is carried out to release.
Embodiment four:
Connect the primary transfer line 3 between urea storage tank 1 and urea ammonium nitrate solution tank 8, the bottom outlet end of described urea storage tank 1 is provided with transfer pump 2, top entry end is connected with auxiliary transfer line 4; Described primary transfer line 3 is connected with transfer pump 2, auxiliary transfer line 4 respectively, between primary transfer line 3 and transfer pump 2, is provided with one-way valve 9-1, between primary transfer line 3 and auxiliary transfer line 4, is provided with reflux valve 9-2.Described main and auxiliary transfer line equal sheathed insulation jacket 5 outward, described insulation jacket 5 is provided with steam steam inlet valve 9-5 and condensed water outlet valve 9-6; The primary transfer line 3 that is positioned at urea ammonium nitrate solution tank 8 entry ends is provided with feeding valve 9-7, and the entry end of described feeding valve 9-7 is provided with root valve 9-8; Described root valve 9-8 is connected with respectively the pipe 10 that purges steam, anticorrosion air duct 12 and hot water injection manage 11, described in purge steam pipe 10, anticorrosion air duct 12 and hot water injection manage and on 11, all have valve 9-9 and check valve 9-10.
Further scheme is, described primary transfer line 3 is provided with thermometer 6 and the second showering guilding valve 9-3, and the entrance point of described root valve 9-8 is respectively equipped with the first showering guilding valve 9-4 and pressure gauge 7.
In order to ensure that urea liquid in transfer line can crystallization, in insulation jacket 5, respectively establish a steam steam inlet valve 9-5 and a condensed water outlet valve 9-6 every 50-70 rice.
The working procedure of the equipment of the present embodiment is as follows:
(1) before transfer line transport urea, open all steam steam inlet valves and condensed water outlet valve in insulation jacket, main and auxiliary transfer line is carried out to preheating;
(2) then opening transfer pump delivers to the urea liquid in urea storage tank in urea ammonium nitrate solution tank through primary transfer line;
(3) after urea liquid has been carried, open reflux valve and root valve, and open the valve purging steam on pipe, in transfer line, pass into steam, urea liquid residual in primary transfer line is blown back in urea storage tank through reflux valve, auxiliary transfer line; Purge after a period of time, open the second showering guilding valve, as at the second showering guilding valve place exhaust steam, illustrate that purging is qualified, close the second showering guilding valve and the valve purging steam on pipe simultaneously;
(4) then open the valve on anticorrosion air duct, in transfer line, pass into air, it is thin that airborne oxygen generates at stainless steel pipeline inwall the oxidation that one deck is thin, reduces transfer line and corrode;
(5) after passing into air and finishing, open the first showering guilding valve and the second showering guilding valve, the main and auxiliary transfer line internal pressure of removal, prevents from forming High Temperature High Pressure, produces corrosion.
(6) observe thermometer instruction, judge whether crystallization of transfer line; When having slight crystallization maybe to need to clean in main and auxiliary transfer line, first open the first showering guilding valve, wait discharging hot water temperature while reaching more than 100 DEG C, open the valve on hot water injection's pipe, transfer line is rinsed.
Above embodiment is not limited only to protection scope of the present invention, all modify based on basic thought of the present invention or change all belong to protection scope of the present invention.
Claims (7)
1. prevent urea ammonium nitrate solution produce in the method for urea transfer line corrosion and crystallization, it is characterized in that: comprise the following steps:
(1) by the transfer line sheathed insulation jacket outward connecting between the urea storage tank in urea production district and the urea ammonium nitrate solution tank of urea ammonium nitrate solution production area, and to passing into steam in insulation jacket, transfer line is carried out to preheating;
(2) opening transfer pump is transported to the urea liquid in urea storage tank in urea ammonium nitrate solution tank by the transfer line after preheating;
(3) after urea liquid has been carried, from being positioned at root valve the transfer line of urea ammonium nitrate solution tank one end, to pass into pressure be that 0.6-1MPa, temperature are 150-160 DEG C purging steam, urea liquid in transfer line is blown back in urea storage tank, until be positioned at the showering guilding valve exhaust steam on the transfer line of urea storage tank one end;
(4) the anticorrosion air at least 30 minutes that passes into pressure in from root valve to transfer line and be 0.3-0.6MPa, forms air conservation layer at the inwall of transfer line;
(5) transfer line is carried out to release.
2. method according to claim 1, is characterized in that: also comprise hot water injection's step, when producing crystallization in transfer line while maybe needing to clean, import the hot water injection's transfer line that is not less than 100 DEG C from root valve.
3. method according to claim 1, is characterized in that: the vapor pressure in described step (1) is that 0.2-0.4MPa, temperature are 130-145 DEG C.
4. method according to claim 1, is characterized in that: in described step (1), in insulation jacket, respectively establish a steam steam inlet valve and a condensed water outlet valve every one section, 50-70 rice.
A realization as described in claim 1-4 any one prevent urea ammonium nitrate solution produce in the equipment of method of the corrosion of urea transfer line and crystallization, comprise the primary transfer line connecting between urea storage tank and urea ammonium nitrate solution tank, the bottom outlet end of described urea storage tank is provided with transfer pump, top entry end is connected with auxiliary transfer line; Described primary transfer line is connected with transfer pump, auxiliary transfer line respectively, it is characterized in that: described main and auxiliary transfer line equal sheathed insulation jacket outward, and described insulation jacket is provided with steam steam inlet valve and condensed water outlet valve; The primary transfer line that is positioned at urea ammonium nitrate solution tank entry end is provided with feeding valve, and the entry end of described feeding valve is provided with root valve; Described root valve is connected with respectively the pipe that purges steam, anticorrosion air duct and hot water injection's pipe, described in purge steam pipe, anticorrosion air duct and hot water injection Guan Shangjun have valve and check valve.
6. equipment according to claim 5, is characterized in that: between described primary transfer line and transfer pump, be provided with one-way valve, between primary transfer line and auxiliary transfer line, be provided with reflux valve.
7. equipment according to claim 5, is characterized in that: described primary transfer line is provided with thermometer and the second showering guilding valve, and the entrance point of described 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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| 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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| CN104089184A true CN104089184A (en) | 2014-10-08 |
| CN104089184B CN104089184B (en) | 2017-06-20 |
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Cited By (6)
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| CN108278490A (en) * | 2016-12-30 | 2018-07-13 | 贵港市芭田生态有限公司 | Anti hardening agent transport system and method |
| CN110328200A (en) * | 2019-07-02 | 2019-10-15 | 河南开祥精细化工有限公司 | A kind of pipeline de-oiling system and method |
| CN110479721A (en) * | 2018-05-15 | 2019-11-22 | 中石化广州工程有限公司 | A kind of sump oil collection system and method |
| 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 |
| CN111720741A (en) * | 2020-06-30 | 2020-09-29 | 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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| CN108278490A (en) * | 2016-12-30 | 2018-07-13 | 贵港市芭田生态有限公司 | Anti hardening agent transport system and method |
| 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 |
| CN110479721A (en) * | 2018-05-15 | 2019-11-22 | 中石化广州工程有限公司 | A kind of sump oil collection 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 |
| CN110328200A (en) * | 2019-07-02 | 2019-10-15 | 河南开祥精细化工有限公司 | A kind of pipeline de-oiling 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 |
| CN111720741A (en) * | 2020-06-30 | 2020-09-29 | 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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