CN113751436A - Online cleaning method for pipe type reactor scaling in ammonium phosphate production - Google Patents
Online cleaning method for pipe type reactor scaling in ammonium phosphate production Download PDFInfo
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- CN113751436A CN113751436A CN202111009607.2A CN202111009607A CN113751436A CN 113751436 A CN113751436 A CN 113751436A CN 202111009607 A CN202111009607 A CN 202111009607A CN 113751436 A CN113751436 A CN 113751436A
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- Prior art keywords
- reactor
- cleaning
- tube reactor
- ammonium phosphate
- tube
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000004140 cleaning Methods 0.000 title claims abstract description 62
- MNNHAPBLZZVQHP-UHFFFAOYSA-N diammonium hydrogen phosphate Chemical compound [NH4+].[NH4+].OP([O-])([O-])=O MNNHAPBLZZVQHP-UHFFFAOYSA-N 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 20
- 239000004254 Ammonium phosphate Substances 0.000 title claims abstract description 18
- 229910000148 ammonium phosphate Inorganic materials 0.000 title claims abstract description 18
- 235000019289 ammonium phosphates Nutrition 0.000 title claims abstract description 18
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000010926 purge Methods 0.000 claims abstract description 10
- 239000002253 acid Substances 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 6
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000002360 preparation method Methods 0.000 claims abstract description 5
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 30
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 239000005696 Diammonium phosphate Substances 0.000 description 5
- 229910000388 diammonium phosphate Inorganic materials 0.000 description 5
- 235000019838 diammonium phosphate Nutrition 0.000 description 5
- 239000002002 slurry Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/0321—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing using pressurised, pulsating or purging fluid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
- B08B2209/032—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces by the mechanical action of a moving fluid
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Cleaning In General (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses an online removing method for scale of a tubular reactor in ammonium phosphate production, relates to the technical field of ammonium phosphate production, solves the technical problem of removing the scale of related pipelines in the existing ammonium phosphate production process, and comprises the following steps: s1, preparing a cleaning solution; s2, using the container in the step S1 as a cleaning tank, connecting a cleaning solution outlet pipe with an inlet of a pipe reactor conveying pump, and installing a control valve at a connecting section for adjustment; s3, when scaling occurs in the reaction, closing a valve connected with the tube reactor and the acid preparation tank of the tube reactor, then opening a valve connected with a delivery pump of the tube reactor and the cleaning tank, and heating by ammonia purging tube steam of the tube reactor; the invention has the advantages that: the pipe reactor does not need to be disassembled and disassembled, the online operation is realized, the scale is removed, the investment is low, the flexibility is realized, and the equipment configuration is simple; the descaling is obvious, and the method is suitable for enterprises adopting a tubular reactor to produce ammonium phosphate.
Description
Technical Field
The invention relates to the technical field of ammonium phosphate production, in particular to the technical field of an online cleaning method for scale formation of a tubular reactor in ammonium phosphate production.
Background
At present, the granulation production of most diammonium phosphate adopts a single-tube reaction granulation process, and the process is widely applied to the production of ammonium phosphate by the advantages of simple structure, rapid reaction, high heat utilization rate and the like. In the production of diammonium phosphate fertilizers, the "traditional" or "neutralized slurry concentration" method is generally used for production. Because the phosphate ore contains a large amount of impurities such as Ca, Mg, Al, SiO2 and the like, a layer of relatively hard scale can be formed on the inner wall of the tubular reactor in the neutralization process of the ammonium phosphate slurry in the tubular reactor, the normal operation of the tubular reactor is influenced, and even the product quality is influenced. In order to remove the scale, the conventional method is to shut down the whole system, disassemble and separate the tubular reactor, disassemble the tubular reactor, and manually knock and remove the tubular reactor. The cleaning of the tubular reactor in the device for producing diammonium phosphate by the tubular reactor for a long time always restricts the stable operation of production, and no method for well solving the problem exists, and no related patent technology exists after retrieval.
Disclosure of Invention
The invention aims to: in order to solve the technical problem, the invention provides an online cleaning method for scale formation of a tubular reactor in ammonium phosphate production.
The invention specifically adopts the following technical scheme for realizing the purpose:
an on-line removing method for scale in a tubular reactor in ammonium phosphate production comprises the following steps:
s1, preparing a cleaning solution: the cleaning solution is composed of sulfuric acid and water, and is prepared in a container according to the mass ratio of the sulfuric acid to the water of 1: 18-20 to prepare the cleaning solution for use;
s2, using the container in the step S1 as a cleaning tank, connecting a cleaning solution outlet pipe with an inlet of a pipe reactor conveying pump, and installing a control valve at a connecting section for adjustment;
s3, when scaling occurs in the reaction, closing a valve connected with the tube reactor and the acid preparation tank of the tube reactor, then opening a valve connected with the cleaning tank and the delivery pump of the tube reactor to deliver cleaning liquid into the tube reactor through the delivery pump of the tube reactor, and then heating ammonia purging tube steam of the tube reactor to accelerate cleaning and descaling of the tube reactor and related pipelines.
The sulfuric acid is 60-98% sulfuric acid.
The volume of the container in the step S1 is 4m3, and the amount of the cleaning solution is 3.5 t.
The cleaning and purging interval in the step S3 is 10-20 minutes/time, the pressure of medium-pressure steam is 1.9MPa, the temperature of the medium-pressure steam is 200-220 ℃, and the cleaning solution is heated to 140-170 ℃.
The invention has the following beneficial effects:
the method provided by the invention is adopted to clean the tubular reactor, the tubular reactor does not need to be disassembled and disassembled, the online operation is realized to remove the scale, the investment is low, the flexibility is high, and the equipment configuration is simple; the scale removal is obvious, and the cleaning is only needed for 1-3 times per day according to different acid qualities in the diammonium phosphate production. Is suitable for enterprises which adopt a tubular reactor to produce ammonium phosphate.
Drawings
FIG. 1 is a schematic view of a cleaning process of the present invention;
reference numerals: 1-cleaning tank, 2-tube reactor tank, 3-tube reactor concentrated acid delivery pump, 4-tube reactor concentrated acid delivery pump inlet valve, 5-cleaning solution pipeline control valve, 6-cleaning solution delivery valve, 7-tube reactor tank sulfuric acid regulating valve, 8-cleaning solution sulfuric acid regulating valve.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, this embodiment provides an online cleaning method for scale formation in a tubular reactor in ammonium phosphate production, which includes the following steps:
s1, preparing a cleaning solution: the cleaning solution is composed of sulfuric acid and water, and is prepared in a container according to the mass ratio of the sulfuric acid to the water of 1: 18-20 to prepare the cleaning solution for use, wherein the sulfuric acid is 60-98% sulfuric acid;
s2, using the container in the step S1 as a cleaning tank, connecting a cleaning solution outlet pipe with an inlet of a pipe reactor conveying pump, and installing a control valve at a connecting section for adjustment;
s3, when scaling occurs in the reaction, closing a valve connected with the tube reactor and the acid preparation tank of the tube reactor, then opening a valve connected with the cleaning tank and the delivery pump of the tube reactor to deliver cleaning liquid into the tube reactor through the delivery pump of the tube reactor, and then heating ammonia purging tube steam of the tube reactor to accelerate cleaning and descaling of the tube reactor and related pipelines.
The container volume in the step S1 is 4m3, and the amount of the cleaning liquid is 3.5 t; the cleaning and purging interval in the step S3 is 10-20 minutes/time, the pressure of medium-pressure steam is 1.9MPa, the temperature of the medium-pressure steam is 200-220 ℃, and the cleaning solution is heated to 140-170 ℃.
Preparing 3.5t of cleaning solution in a cleaning tank with the capacity of 4t by using 60-98% of sulfuric acid and water according to the mass ratio of 1: 18-20.
When the tube reactor needs to be purged and cleaned according to the service condition of the tube reactor, stopping spraying slurry on the tube reactor, closing a valve 4 connected with an acid preparation tank of the tube reactor and the tube reactor, then opening valves 5 and 6 connected with a cleaning tank and a delivery pump of the tube reactor, sending cleaning solution into the tube reactor through a delivery pump 3 of the tube reactor, then introducing steam through an ammonia purging tube steam pipe of the tube reactor, and heating and accelerating the tube reactor and related pipelines.
When the cleaning is carried out by blowing, the sprayed steam is medium-pressure steam with the pressure of 1.9MPa and the temperature of 200-220 ℃, the cleaning liquid can be heated to 140-170 ℃ in the cleaning process, the cleaning time is 10-20 minutes/time, and one-time cleaning can be completed in 10 minutes under the normal condition.
Comparison of Effect before and after 2020 Wash
The data are average low feeding amount and average purging frequency in the same day, the feeding amount is increased by about 1m 3/h after modification, the purging and cleaning frequency is obviously reduced, the effect is very obvious, and based on the experimental result, the cleaning method provided by the invention is fully proved to be used for cleaning the tubular reactor, the tubular reactor is not required to be disassembled and disassembled, the online operation for removing the scale is realized, the investment is low, the flexibility is high, and the equipment configuration is simple; the scale removal is obvious, and only 1-3 times per day is needed according to different acid qualities in the diammonium phosphate production; is suitable for enterprises which adopt a tubular reactor to produce ammonium phosphate.
Claims (4)
1. An online cleaning method for scale formation of a tubular reactor in ammonium phosphate production is characterized by comprising the following steps:
s1, preparing a cleaning solution: the cleaning solution is composed of sulfuric acid and water, and is prepared in a container according to the mass ratio of the sulfuric acid to the water of 1: 18-20 to prepare the cleaning solution for use;
s2, using the container in the step S1 as a cleaning tank, connecting a cleaning solution outlet pipe with an inlet of a pipe reactor conveying pump, and installing a control valve at a connecting section for adjustment;
s3, when scaling occurs in the reaction, closing a valve connected with the tube reactor and the acid preparation tank of the tube reactor, then opening a valve connected with the cleaning tank and the delivery pump of the tube reactor to deliver cleaning liquid into the tube reactor through the delivery pump of the tube reactor, and then heating ammonia purging tube steam of the tube reactor to accelerate cleaning and descaling of the tube reactor and related pipelines.
2. The method for on-line removing the scale in the tubular reactor in the ammonium phosphate production according to claim 1, wherein the sulfuric acid is 60-98% sulfuric acid.
3. The method of claim 1, wherein the vessel volume in step S1 is 4m3And the amount of the cleaning liquid is 3.5 t.
4. The method for online removing scale in the tubular reactor in ammonium phosphate production according to claim 1, wherein the cleaning and purging interval in the step S3 is 10-20 minutes/time, the pressure of the medium-pressure steam is 1.9MPa, the temperature of the medium-pressure steam is 200-220 ℃, and the cleaning solution is heated to 140-170 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111009607.2A CN113751436A (en) | 2021-08-31 | 2021-08-31 | Online cleaning method for pipe type reactor scaling in ammonium phosphate production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111009607.2A CN113751436A (en) | 2021-08-31 | 2021-08-31 | Online cleaning method for pipe type reactor scaling in ammonium phosphate production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113751436A true CN113751436A (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111009607.2A Pending CN113751436A (en) | 2021-08-31 | 2021-08-31 | Online cleaning method for pipe type reactor scaling in ammonium phosphate production |
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| Country | Link |
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| CN (1) | CN113751436A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114191833A (en) * | 2021-12-19 | 2022-03-18 | 山东清沂山石化科技有限公司 | Online steam tower salt washing system for amine liquid regeneration tower |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101928946A (en) * | 2010-08-06 | 2010-12-29 | 瓮福（集团）有限责任公司 | Method for clearing shell side scale of shell and tube heater in monoammonium phosphate production on line |
| US20110209730A1 (en) * | 2008-12-03 | 2011-09-01 | Varrin Jr Robert D | Chemical Cleaning Method and System with Steam Injection |
| CN103303889A (en) * | 2013-07-03 | 2013-09-18 | 瓮福（集团）有限责任公司 | Online cleaning method for tubular reactors |
| CN103303890A (en) * | 2013-07-04 | 2013-09-18 | 瓮福（集团）有限责任公司 | Online reflux rinsing method for tubular reactor |
| 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 |
-
2021
- 2021-08-31 CN CN202111009607.2A patent/CN113751436A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110209730A1 (en) * | 2008-12-03 | 2011-09-01 | Varrin Jr Robert D | Chemical Cleaning Method and System with Steam Injection |
| CN101928946A (en) * | 2010-08-06 | 2010-12-29 | 瓮福（集团）有限责任公司 | Method for clearing shell side scale of shell and tube heater in monoammonium phosphate production on line |
| CN103303889A (en) * | 2013-07-03 | 2013-09-18 | 瓮福（集团）有限责任公司 | Online cleaning method for tubular reactors |
| CN103303890A (en) * | 2013-07-04 | 2013-09-18 | 瓮福（集团）有限责任公司 | Online reflux rinsing method for tubular reactor |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114191833A (en) * | 2021-12-19 | 2022-03-18 | 山东清沂山石化科技有限公司 | Online steam tower salt washing system for amine liquid regeneration tower |
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Application publication date: 20211207 |