CN102430551B - Descaling method for slurry conveyance pipeline of monoammonium phosphate drying tower by steam blowing - Google Patents
Descaling method for slurry conveyance pipeline of monoammonium phosphate drying tower by steam blowing Download PDFInfo
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- CN102430551B CN102430551B CN201110385414.7A CN201110385414A CN102430551B CN 102430551 B CN102430551 B CN 102430551B CN 201110385414 A CN201110385414 A CN 201110385414A CN 102430551 B CN102430551 B CN 102430551B
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Abstract
The invention relates to a descaling method for a slurry conveyance pipeline of a monoammonium phosphate drying tower by steam blowing, comprising the following step of continuously feeding steam into the slurry conveyance pipeline, wherein the steam is fed in the slurry conveyance pipeline through the outlet end of the slurry conveyance pipeline, and fed out through the inlet end of the slurry conveyance pipeline. According to the descaling method provided by the invention, each blowing descaling time is shortened to more than a half, the steam consumption amount is largely reduced, the steam use amount can be reduced by 2200 m3 each year, and the production efficiency is further improved; and the slurry carried in the blowing tail gas can be recycled, so that the nutrient utilization can be improved, and the environmental pollution is decreased.
Description
Technical field
The present invention relates to a kind of steam blowing descaling method of MAP drying tower slurry conveying pipeline.
Background technology
Adopt slurry concentrated process to produce MAP, need the MAP slip after ammonification neutralization, two-effect evaporation being concentrated to be piped in spray drying tower and carry out drying and dehydrating.Because the MAP pulp density after two effects are concentrated is up to 1.5g/ml, viscosity is comparatively large, and slip is easy fouling in conveyance conduit, blocking pipe, required periodic cleaning pipeline.Usually aborning, adopt temperature about 150 DEG C, the water vapour of pressure about 0.2Mpa is by entrance import pipe, and purging of ventilating continuously, water vapour takes pipeline by after softening for the slip be attached on tube wall, dilution out of with air-flow, and the tail gas carrying slip is discharged by emptying pipe.Because each scale removal time is longer, about 7 minutes each scale removal time just can complete clean-up task, comparatively large for water vapour amount needed for each scale removal of this Purge methods, to produce the production line of 120kt MAP per year, within 1 year, steam consumption quantity reaches 50t, needs to consume a large amount of heat energy.
Summary of the invention
The object of this invention is to provide a kind of steam blowing descaling method of MAP drying tower slurry conveying pipeline, the consumption of scale removal water vapour used can be reduced, with economize energy.
The present invention is achieved in that and is imported in slurry conveying pipeline continuously by the port of export of water vapour by slurry conveying pipeline, and is derived by the entrance point of slurry conveying pipeline.
The present inventor finds in long-term production practices, water vapour by slurry pipeline transport direction to the main cause that blowing pipeline scale removal consumes quantity of steam large is: the layer of scale thickness on inner-walls of duct has directionality, namely entrance point is thin, and the port of export is thick, the not only fine and close and smooth surface of entrance point layer of scale.Its origin cause of formation has two, and first pipe head discharge pressure is large; It two is that slurry conveying pipeline has larger difference in height, and the port of export exceeds more than 20m than entrance point, and slip exacerbates the directionality tendency of this fouling under the effect of deadweight.When steam along entrance point enter pipeline carry out forward purge time, smooth and the layer of scale of densification of entrance point to the temperature of steam and pressure consumption comparatively large, and soften, dilute after slip need steam upwards to overcome its gravity blow pipe also to cause its temperature and pressure consumption.And the present invention adopts the reverse blowing method of steam, the soft layer of scale in pipeline upper end first contacts with high temperature and high pressure steam, degrades downwards layer by layer, and the pulp flow under with steam flush is when lower end of duct inwall, fouling top layer is washed away, destroys its surface, so that degrade; And the process that slip is discharged not only less consumes steam energy, slip deadweight is also conducive to downward accelerated motion, increase the trend destroying lower end of duct fouling top layer, wet-hot steam is made to be easy to infiltrate its inside, accelerate it softening loosening, thus can shorten each time purging scale removal, reduce steam consumption, the driving time of drying device can also be extended simultaneously, enhance productivity.
A preferred version of the present invention is: purge tail gas and refluxed through the emptying of slip feeder by evacuated tube.Purge tail gas and directly do not drain into the external world, the slip carried in tail gas can be recycled, and can improve plant recovery of nutrient, reduces environmental pollution.
As shown from the above technical solution, although steam blowing direction just changes by the present invention, but unexpected effect is played, the time that each scale removal imports water vapour can shorten to about 3 minutes by original 7 minutes, purge scale removal time shorten over half, not only greatly reduce steam consumption, steam use amount 2200m can be reduced every year
3, can also enhance productivity; Purge the slip carried in tail gas can be recycled, can plant recovery of nutrient be improved, reduce environmental pollution.
Accompanying drawing explanation
Fig. 1 is present invention process schematic diagram.
Detailed description of the invention
As shown in Figure 1, the MAP after concentrated from two effects is entered by slurry conveying pipeline 3 bottom inlet end through valve 2 by high-pressure slurry pump 1, then sends into the dehydration of drying tower 5 inner drying through upper outlet end through valve 4.
When needing scale removal, valve-off 4, by temperature about 150 DEG C, the pressure water vapour that is about 0.20MPa imports in slurry conveying pipeline 3 by slurry conveying pipeline 3 port of export by pipeline 6 through valve 7 continuously, and derived through valve 2 by the entrance point of slurry conveying pipeline 3, purging tail gas is back in slip feeder 9 by evacuated tube 8, the slip that purging tail gas carries is deposited on slip feeder 9, purges tail gas emptying.When flowing out without slip in purging tail gas, stopping air feed, purging and terminating.
To produce the production line of 120kt MAP per year, each purge time only needs about 3 minutes, and the slip carried in tail gas is deposited on slip feeder, can be recycled, reduce environmental pollution simultaneously.
Claims (2)
1. the steam blowing descaling method of MAP drying tower slurry conveying pipeline, water vapour is passed into continuously in slurry conveying pipeline (3), it is characterized in that: described water vapour is imported in slurry conveying pipeline (3) by the port of export of slurry conveying pipeline (3), and is derived by the entrance point of slurry conveying pipeline (3).
2. the steam blowing descaling method of MAP drying tower slurry conveying pipeline according to claim 1, is characterized in that: purge tail gas and refluxed through slip feeder (9) emptying by evacuated tube (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110385414.7A CN102430551B (en) | 2011-11-28 | 2011-11-28 | Descaling method for slurry conveyance pipeline of monoammonium phosphate drying tower by steam blowing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110385414.7A CN102430551B (en) | 2011-11-28 | 2011-11-28 | Descaling method for slurry conveyance pipeline of monoammonium phosphate drying tower by steam blowing |
Publications (2)
| Publication Number | Publication Date |
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| CN102430551A CN102430551A (en) | 2012-05-02 |
| CN102430551B true CN102430551B (en) | 2014-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110385414.7A Active CN102430551B (en) | 2011-11-28 | 2011-11-28 | Descaling method for slurry conveyance pipeline of monoammonium phosphate drying tower by steam blowing |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089184B (en) * | 2014-06-26 | 2017-06-20 | 安徽淮化股份有限公司 | 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 |
| CN104624577A (en) * | 2014-12-31 | 2015-05-20 | 瓮福达州化工有限责任公司 | Cleaning method for wet process phosphoric acid production equipment |
| CN109663788B (en) * | 2019-01-09 | 2021-07-02 | 长乐力恒锦纶科技有限公司 | Method for cleaning caprolactam pipeline |
| 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 |
Citations (3)
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|---|---|---|---|---|
| CN2247658Y (en) * | 1995-01-10 | 1997-02-19 | 四川联合大学 | Apparatus for producing ammonium phosphate by slurry concentration |
| US20070240739A1 (en) * | 2006-04-13 | 2007-10-18 | Great Southern Independent, L.L.C. | System and method for on-line cleaning of black oil heater tubes and delayed coker heater tubes |
| CN101637768A (en) * | 2009-08-26 | 2010-02-03 | 中冶集团华冶资源开发有限责任公司 | Pipeline cleaning method |
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2011
- 2011-11-28 CN CN201110385414.7A patent/CN102430551B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2247658Y (en) * | 1995-01-10 | 1997-02-19 | 四川联合大学 | Apparatus for producing ammonium phosphate by slurry concentration |
| US20070240739A1 (en) * | 2006-04-13 | 2007-10-18 | Great Southern Independent, L.L.C. | System and method for on-line cleaning of black oil heater tubes and delayed coker heater tubes |
| CN101637768A (en) * | 2009-08-26 | 2010-02-03 | 中冶集团华冶资源开发有限责任公司 | Pipeline cleaning method |
Non-Patent Citations (2)
| Title |
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| 尿素熔融喷浆造粒制复混肥;李兴田;《硫磷设计与粉体工程》;20040430(第4期);第21-23页 * |
| 重油掺水乳化燃烧技术的试验与研究;徐强;《硫酸工业》;19970531(第5期);第15页第三栏倒数第2段，及图1 * |
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| CN102430551A (en) | 2012-05-02 |
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