CN101928946B - Method for clearing shell side scale of shell and tube heater in monoammonium phosphate production on line - Google Patents
Method for clearing shell side scale of shell and tube heater in monoammonium phosphate production on line Download PDFInfo
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- CN101928946B CN101928946B CN2010102470802A CN201010247080A CN101928946B CN 101928946 B CN101928946 B CN 101928946B CN 2010102470802 A CN2010102470802 A CN 2010102470802A CN 201010247080 A CN201010247080 A CN 201010247080A CN 101928946 B CN101928946 B CN 101928946B
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Abstract
The invention discloses a method for clearing shell side scale of a shell and tube heater in monoammonium phosphate production on line, which comprises: (1) preparing cleaning solution consisting of 20 to 40 percent of phosphoric acid (in form of P2O5), 30 to 40 percent of nitric acid, 60 to 98 percent of sulfuric acid and 10 to 15 percent of fluosilicic acid in a mass ratio of 5:3:1:1; (2) placing a container serving as a cleaning circulating tank and a conveying pump connected with a cleaning solution outlet pipe on a mobile cart, moving the mobile cart toward the shell and tube heater of which the scale is to be cleared, connecting the conveying pump with an acid inlet at the lower part of the shell side of the heater and connecting the acid outlet on the upper part of the shell side of the heater with the container by a conduit; and (3) starting the conveying pump during the periodical stop of the device, feeding the cleaning solution the shell side of the heater to clean the shell side of the heater circularly, and introducing low-pressure steam from the bottom of the heater for heating. In the method, the online scale clearing can be realized flexibly without detaching the heater and with small investment; the equipment configuration is simple; the scale are cleared obviously; and cleaning is performed once a year. The method is applicable for monoammonium phosphate manufacturers.
Description
[technical field]
The present invention relates to production of phosphate fertilizer, furthermore, relate to the production of phosphorus ammonium, the removing method of tube still heater shell side fouling in producing in particular to the phosphorus ammonium.
[background technology]
Ammophos comprises monoammonium phosphate and diammonium phosphate, is one of main fertilizer of industry such as modern agriculture and forestry.Ammophos adopts " traditional method " or " in and slip concentrate " method production usually.Owing to contain a large amount of Ca, Mg, Al, SiO in the Rock Phosphate (72Min BPL)
2Etc. a large amount of impurity, cause phosphor ammonium slurry in enrichment process, there is the fouling of one deck different thickness on tube still heater shell side (promptly between pipe) surface, influences the well heater heat exchange efficiency.In order to remove fouling, traditional way is that well heater is dismantled off-line, taking the shell of well heater apart, manually removes.Obvious this method time and effort consuming.At present there is not well to solve the method for this difficult problem.By retrieval, there is not relevant patented technology yet.
[summary of the invention]
Purpose of the present invention just is to provide the online removing method of tube still heater shell side fouling in a kind of phosphorus ammonium production, to solve a difficult problem of removing the fouling of well heater shell side.
The online removing method that the contriver provides is to adopt chemical agent to clean the method for fouling, comprising:
(1) preparation scavenging solution
Used scavenging solution is made up of phosphoric acid, nitric acid, sulfuric acid and 4 kinds of acid of silicofluoric acid, and the massfraction and the mass ratio of 4 kinds of acid are as follows:
P
2O
520%～40% phosphoric acid, 30%～40% nitric acid
60%～98% sulfuric acid, 10%～15% silicofluoric acid
The mass ratio of phosphoric acid, nitric acid, sulfuric acid and silicofluoric acid is 5: 3: 1: 1,
It is back standby that described 4 kinds of acid are stirred in container;
(2) described container is used as the clean cycle groove, the rinse liquid outlet pipe is connected with transferpump, and with placing on the travelling car, travelling car is connected with the acid inlet of well heater shell side bottom near after needing to remove the tube still heater of fouling; The acid outlet on well heater shell side top is connected with described container with conduit;
(3) start transferpump at the regular parking period of device, scavenging solution is sent into well heater shell side internal recycle clean; Feed the low-pressure steam heating in heater base.
Container described in above-mentioned (1) step is the bucket of capacity 1t, and the amount of described scavenging solution is 1t.
The time of wash cycles is 20h/ time described in above-mentioned (3) step; The pressure of described low-pressure steam is 0.45MPa, and Heating temperature is 80 ℃～100 ℃.
Adopt method provided by the invention to carry out the cleaning of tube still heater, need not dismantle well heater, realize online removing fouling, less investment, maneuverability, equipment configuration are simply; Scale removal is comparatively obvious, only needs to clean to get final product for 1 time in 1 year.Be applicable to phosphorus ammonium manufacturing enterprise.
[description of drawings]
Accompanying drawing is the cleaning process synoptic diagram of the inventive method.1 is soda liquor container among the figure, and 2 is transferpump, and 3 is well heater, and 4 is travelling car.
[embodiment]
480,000 tons of/year powdery monoammonium phosphate devices of phosphate fertilizer plant of urn good fortune (group) company limited take chemical process regularly to carry out Hand scarf by groping for many years to MAP Plant well heater shell side, obtain good result.
Specific practice is:
Use P
2O
530% phosphoric acid, 40% nitric acid, 98% sulfuric acid and 4 kinds of acid of 15% silicofluoric acid are 5: 3: 1 according to mass ratio: 1 ratio is made into the 1t scavenging solution, packs in the 1t bucket, stirs.
The 1t bucket is used as the clean cycle groove: the rinse liquid outlet pipe is connected with transferpump, and with placing on the travelling car, travelling car is connected with the acid inlet of well heater shell side bottom near after needing to remove the tube still heater of fouling; The acid outlet on well heater shell side top is connected with bucket with conduit.
Start transferpump at the regular parking period of device, scavenging solution is sent into well heater shell side internal recycle clean 20h; Feeding pressure in heater base is the low-pressure steam of 0.45MPa, is heated to 90 ℃ and is retained to clean and finishes.
Effect comparison before and after cleaning
Above data are for working as per day low-pressure steam consumption, mean yield.
Clean the back steam consumption and reduce about 5 tons/hour, and produce load increased the 3-5 ton/hour, effect is tangible.
Claims (3)
1. the online removing method of tube still heater shell side fouling during the phosphorus ammonium is produced, this method adopts chemical agent to clean fouling, and its feature comprises:
(1) preparation scavenging solution
Used scavenging solution is made up of phosphoric acid, nitric acid, sulfuric acid and 4 kinds of acid of silicofluoric acid, and the massfraction and the mass ratio of 4 kinds of acid are as follows:
Contain P
2O
5Be 20%～40% phosphoric acid 30%～40% nitric acid
60%～98% sulfuric acid, 10%～15% silicofluoric acid
The mass ratio of phosphoric acid, nitric acid, sulfuric acid and silicofluoric acid is 5: 3: 1: 1,
It is back standby that described 4 kinds of acid are stirred in container;
(2) described container is used as the clean cycle groove, the rinse liquid outlet pipe is connected with transferpump, and with placing on the travelling car, travelling car is connected with the acid inlet of well heater shell side bottom near after needing to remove the tube still heater of fouling; The acid outlet on well heater shell side top is connected with described container with conduit;
(3) start transferpump at the regular parking period of device, scavenging solution is sent into well heater shell side internal recycle clean; Feed the low-pressure steam heating in heater base.
2. the method for claim 1 is characterized in that the container described in described (1) step is the bucket of capacity 1t, and the amount of described scavenging solution is 1t.
3. the method for claim 1 is characterized in that the time of wash cycles described in described (3) step is 20h/ time; The pressure of described low-pressure steam is 450kPa, and Heating temperature is 80 ℃～100 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102470802A CN101928946B (en) | 2010-08-06 | 2010-08-06 | Method for clearing shell side scale of shell and tube heater in monoammonium phosphate production on line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102470802A CN101928946B (en) | 2010-08-06 | 2010-08-06 | Method for clearing shell side scale of shell and tube heater in monoammonium phosphate production on line |
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| Publication Number | Publication Date |
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| CN101928946A CN101928946A (en) | 2010-12-29 |
| CN101928946B true CN101928946B (en) | 2011-10-05 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104624586B (en) * | 2014-12-31 | 2017-04-26 | 贵州瓮福蓝天氟化工股份有限公司 | Online cleaning method for off-gas pipe in fluosilicic acid concentration system |
| CN105018948B (en) * | 2015-07-22 | 2018-07-24 | 中冶南方工程技术有限公司 | A kind of 304 austenitic stainless steel acid washing method of hot rolling |
| CN105195476B (en) * | 2015-09-09 | 2018-08-14 | 瓮福达州化工有限责任公司 | A kind of split-phase tub cleaning method |
| CN108212995A (en) * | 2017-12-21 | 2018-06-29 | 甘肃瓮福化工有限责任公司 | The online sweep-out method of tubular type reaction fouling in a kind of production of ammonium phosphate |
| CN113751436A (en) * | 2021-08-31 | 2021-12-07 | 甘肃瓮福化工有限责任公司 | Online cleaning method for pipe type reactor scaling in ammonium phosphate production |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101549346B (en) * | 2009-05-12 | 2011-06-08 | 瓮福（集团）有限责任公司 | A wet phosphoric acid purifying extractor descaling method |
| CN101758048A (en) * | 2009-11-17 | 2010-06-30 | 瓮福（集团）有限责任公司 | Method for cleaning and descaling phosphoric acid storage tank |
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Address after: 550500 Guizhou Province, Qiannan Buyei and Miao Autonomous Prefecture Fuquan Racecourse town Yingbin Road No. 1 Wengfu group Patentee after: WENGFU GROUP Co.,Ltd. Address before: 23, 550002 floor, urn Fuk international, No. 57, South City Road, Guizhou, Guiyang Patentee before: WENGFU GROUP Co.,Ltd. |