CN114870419B - Method for improving cleaning efficiency of phosphoric acid flash chamber - Google Patents
Method for improving cleaning efficiency of phosphoric acid flash chamber Download PDFInfo
- Publication number
- CN114870419B CN114870419B CN202210584701.9A CN202210584701A CN114870419B CN 114870419 B CN114870419 B CN 114870419B CN 202210584701 A CN202210584701 A CN 202210584701A CN 114870419 B CN114870419 B CN 114870419B
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- CN
- China
- Prior art keywords
- cleaning
- flash chamber
- cleaning liquid
- phosphoric acid
- compressed air
- Prior art date
- 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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- 238000004140 cleaning Methods 0.000 title claims abstract description 115
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 66
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 239000002253 acid Substances 0.000 claims abstract description 25
- 238000000605 extraction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 230000001502 supplementing effect Effects 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012824 chemical production Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000006260 foam Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002367 phosphate rock Substances 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/06—Flash distillation
-
- 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
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention discloses a method for improving the cleaning efficiency of a phosphoric acid flash chamber, and relates to the technical field of cleaning of phosphoric acid concentration devices. A branch pipe is arranged on an acid inlet pipeline of the flash chamber, and the branch pipe is connected with a compressed air supply device through a valve; after the phosphoric acid in the flash chamber is evaporated, filling the cleaning liquid into the flash chamber from an acid inlet at the bottom of the flash chamber, starting a phosphoric acid circulating pump when the high-order acid taking port overflows, and introducing compressed air into the flash chamber; after the whole flash chamber is filled with the cleaning liquid, stopping filling the cleaning liquid, and performing circulating cleaning; cleaning and then evacuating the cleaning liquid; and filling the cleaning solution again to carry out secondary circulation cleaning. The whole flash chamber is filled with the cleaning liquid, a certain vacuum degree is maintained, meanwhile, compressed air is supplemented, circulation cleaning is carried out, in the process, the compressed air enables the cleaning liquid to be in a moving state in the flash chamber, the upper portion and the top of the flash chamber are continuously flushed, the cleaning speed of scaling substances is accelerated, the cleaning time of the flash chamber is greatly shortened, and meanwhile, the cleaning effect of the inner wall of the flash chamber is guaranteed.
Description
Technical Field
The invention relates to the technical field of phosphoric acid concentration device cleaning, in particular to a method for improving the cleaning efficiency of a phosphoric acid flash chamber.
Background
The concentration process of phosphoric acid mainly comprises the steps of heating dilute acid in a shell and tube heat exchanger by low-pressure steam, entering the shell and tube heat exchanger from the bottom of a flash chamber, maintaining a certain vacuum degree, enabling the phosphoric acid to be rapidly evaporated and concentrated in the flash chamber, enabling a part of concentrated phosphoric acid to serve as finished phosphoric acid to enter the next processing link, enabling a part of concentrated phosphoric acid to serve as circulating acid to enter the shell and tube heat exchanger again through a circulating pump, enabling gas generated in the process to enter a foam remover, and enabling tail gas after treatment to enter a fluorine absorption tower for tail gas treatment. Along with the development of the phosphorus chemical industry, the grade of the phosphorite is gradually reduced, so that the content of impurities in the phosphoric acid is continuously increased, such as impurities of iron, aluminum, magnesium and the like. During the concentration process, as the concentration of phosphoric acid increases, impurities are separated out in crystallization, scaling on the inner wall of the concentration equipment, particularly in the flash chamber. As shown in fig. 1, the bottom acid flash chamber foulants are more concentrated in the mid-upper and top positions of the plant. The scaling substances can fall into the production system to block the pipelines and equipment, so that the production efficiency is reduced, and the regular maintenance and cleaning are required.
Patent CN113458064A discloses a method for cleaning a concentration system of a phosphorus chemical production device, wherein the circulating cleaning is carried out on the whole concentration system, cleaning acid is injected into the concentration system for circulating cleaning, the temperature of the cleaning acid liquid is controlled to be 78-85 ℃, and the circulating cleaning time is controlled to be 18-26 hours. However, in practical use, it was found that since the flash chamber was acid-fed from the bottom, it was difficult to clean the top and upper portions of the flash chamber even if the flash chamber was filled with the cleaning acid solution, and the effect after cleaning for 25 hours was as shown in fig. 2. Therefore, there is a need to develop methods to improve the cleaning efficiency of phosphoric acid flash chambers.
Disclosure of Invention
The invention aims to provide a method for improving the cleaning efficiency of a phosphoric acid flash chamber, which solves the problems that the existing cleaning method is difficult to clean and has poor cleaning effect and low efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for improving the cleaning efficiency of a phosphoric acid flash chamber, which is characterized by comprising the following steps:
s1, arranging a branch pipe on an acid inlet pipeline of a flash chamber, wherein the branch pipe is connected with a compressed air supply device through a valve;
s2, after the phosphoric acid in the flash chamber is finished, filling cleaning liquid into the flash chamber from an acid inlet at the bottom of the flash chamber, starting a phosphoric acid circulating pump when the high-order acid taking port overflows, and simultaneously opening a valve to introduce compressed air into the flash chamber;
s3, stopping filling the cleaning liquid after the whole flash chamber is filled with the cleaning liquid, and ensuring that the vacuum at the top of the flash chamber is not lower than 100kPa for circular cleaning;
s4, cleaning for 4-6 hours, and then evacuating the cleaning liquid; and C, supplementing the cleaning solution again according to the step S2 to carry out secondary circulation cleaning, wherein the secondary circulation cleaning time is 11-12 hours.
The further technical proposal is that the pressure of the compressed air is 0.5Mpa, and the filling amount is 10-15 m 3 /h。
Further technical proposal is that the circulation volume of the cleaning liquid is 6000m 3 /h。
Further technical proposal is that the cleaning liquid is H 2 SO 4 The concentration is 6 to 8 percent% solution.
The further technical proposal is that the circulating cleaning temperature is 80-85 ℃.
Compared with the prior art, the invention has the beneficial effects that: the method for improving the cleaning efficiency of the phosphoric acid flash chamber is characterized in that the whole flash chamber is filled with cleaning liquid, a certain vacuum degree is maintained, compressed air is supplemented at the same time, circulation cleaning is carried out, the cleaning liquid is in a moving state in the flash chamber under the pressure of the compressed air in the process, the upper part and the top of the flash chamber are continuously flushed, the cleaning speed of scaling matters is accelerated, the cleaning time of the flash chamber is greatly shortened, and meanwhile, the cleaning effect of the inner wall of the flash chamber is also ensured.
Drawings
FIG. 1 is a diagram of internal fouling prior to cleaning of a prior art flash chamber.
FIG. 2 is a graph of fouling of the inner wall of a flash chamber after 25h of prior art cleaning.
FIG. 3 is an internal view of the flash chamber after cleaning in example 1.
FIG. 4 is an internal view of the flash chamber after cleaning in example 2.
FIG. 5 is an internal view of the flash chamber after cleaning in example 3.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
A method for improving the cleaning efficiency of a phosphoric acid flash chamber, comprising the steps of:
s1, preparing H 2 SO 4 The solution with the concentration of 6.5% is used as a cleaning solution for standby.
S2, arranging a branch pipe on an acid inlet pipeline of the flash chamber, wherein the branch pipe is connected with a compressed air supply device through a valve.
S3, after the phosphoric acid in the flash chamber is finished, filling the cleaning solution into the flash chamber from an acid inlet at the bottom of the flash chamber, and starting a phosphoric acid circulating pump when the high acid extraction port overflows, wherein the same is as thatWhen the valve is opened, compressed air is introduced into the flash chamber; the pressure of the compressed air is 0.5Mpa, and the filling amount is 10-12 m 3 /h。
S4, stopping filling the cleaning solution after the whole flash chamber is filled with the cleaning solution, ensuring that the vacuum at the top of the flash chamber is 100kPa, and performing circulating cleaning, wherein the circulating amount of the cleaning solution is 6000m 3 And/h, the circulating cleaning temperature is 80 ℃.
S5, cleaning for 5 hours, and then evacuating the cleaning liquid; and C, supplementing cleaning liquid again according to the step S3 to carry out secondary circulation cleaning, wherein the secondary circulation cleaning time is 12 hours, and the circulation cleaning temperature is 85 ℃.
The removal of the scaling substances in the flash chamber after cleaning is shown in fig. 3, and the cleaning effect is far better than that in fig. 2.
Example 2
A method for improving the cleaning efficiency of a phosphoric acid flash chamber, comprising the steps of:
s1, preparing H 2 SO 4 The 7% strength solution was used as a cleaning solution.
S2, arranging a branch pipe on an acid inlet pipeline of the flash chamber, wherein the branch pipe is connected with a compressed air supply device through a valve.
S3, after the phosphoric acid in the flash chamber is finished, filling the cleaning liquid into the flash chamber from an acid inlet at the bottom of the flash chamber, starting a phosphoric acid circulating pump when the high acid extraction port overflows, and simultaneously opening a valve to introduce compressed air into the flash chamber; the pressure of the compressed air is 0.5Mpa, and the filling amount is 12-15 m 3 /h。
S4, stopping filling the cleaning liquid after the whole flash chamber is filled with the cleaning liquid, ensuring that the vacuum at the top of the flash chamber is more than 100kPa, and performing circulating cleaning, wherein the circulating amount of the cleaning liquid is 6000m 3 And/h, the circulating cleaning temperature is 82 ℃.
S5, cleaning for 4 hours, and then evacuating the cleaning liquid; and C, supplementing cleaning liquid again according to the step S3 to carry out secondary circulation cleaning, wherein the secondary circulation cleaning time is 11 hours, and the circulation cleaning temperature is 83 ℃.
Example 3
A method for improving the cleaning efficiency of a phosphoric acid flash chamber, comprising the steps of:
s1, preparing H 2 SO 4 The solution with the concentration of 7.5% is used as a cleaning solution for standby.
S2, arranging a branch pipe on an acid inlet pipeline of the flash chamber, wherein the branch pipe is connected with a compressed air supply device through a valve.
S3, after the phosphoric acid in the flash chamber is finished, filling the cleaning liquid into the flash chamber from an acid inlet at the bottom of the flash chamber, starting a phosphoric acid circulating pump when the high acid extraction port overflows, and simultaneously opening a valve to introduce compressed air into the flash chamber; the pressure of the compressed air is 0.5Mpa, and the filling amount is 11-13 m 3 /h。
S4, stopping filling the cleaning liquid after the whole flash chamber is filled with the cleaning liquid, ensuring that the vacuum at the top of the flash chamber is more than 100kPa, and performing circulating cleaning, wherein the circulating amount of the cleaning liquid is 6000m 3 And/h, the circulating cleaning temperature is 85 ℃.
S5, cleaning for 6 hours, and then evacuating the cleaning liquid; and C, supplementing cleaning liquid again according to the step S3 to carry out secondary circulation cleaning, wherein the secondary circulation cleaning time is 10 hours, and the circulation cleaning temperature is 80 ℃.
Although the invention has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the scope and spirit of the principles of this disclosure. More specifically, various variations and modifications may be made to the component parts or arrangements of the subject combination arrangement within the scope of the disclosure, drawings and claims of this application. In addition to variations and modifications in the component parts or arrangements, other uses will be apparent to those skilled in the art.
Claims (1)
1. A method for improving the cleaning efficiency of a phosphoric acid flash chamber, which is characterized by comprising the following steps:
s1, arranging a branch pipe on an acid inlet pipeline of a flash chamber, wherein the branch pipe is connected with a compressed air supply device through a valve;
s2, after the phosphoric acid in the flash chamber is finished, filling cleaning liquid into the flash chamber from an acid inlet at the bottom of the flash chamber, starting a phosphoric acid circulating pump when the high acid extraction port overflows, and simultaneously opening a valve to introduce compressed air into the flash chamber;
s3, stopping filling the cleaning liquid after the whole flash chamber is filled with the cleaning liquid, and ensuring that the vacuum at the top of the flash chamber is not lower than 100kPa for circular cleaning;
s4, cleaning for 4-6 hours, and then evacuating the cleaning liquid; step S2, filling cleaning liquid again to carry out secondary circulation cleaning, wherein the secondary circulation cleaning time is 10-12 hours;
the pressure of the compressed air is 0.5Mpa, and the filling amount is 10-15 m 3 /h; the circulation amount of the cleaning liquid is 6000m 3 /h; the cleaning liquid is H 2 SO 4 A solution with a concentration of 6.5% -7.5%; the circulating cleaning temperature is 80-82 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210584701.9A CN114870419B (en) | 2022-05-26 | 2022-05-26 | Method for improving cleaning efficiency of phosphoric acid flash chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210584701.9A CN114870419B (en) | 2022-05-26 | 2022-05-26 | Method for improving cleaning efficiency of phosphoric acid flash chamber |
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| Publication Number | Publication Date |
|---|---|
| CN114870419A CN114870419A (en) | 2022-08-09 |
| CN114870419B true CN114870419B (en) | 2024-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210584701.9A Active CN114870419B (en) | 2022-05-26 | 2022-05-26 | Method for improving cleaning efficiency of phosphoric acid flash chamber |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61107987A (en) * | 1984-10-30 | 1986-05-26 | Mitsubishi Heavy Ind Ltd | Method for washing multi-stage flash evaporation apparatus |
| CN87203198U (en) * | 1987-04-27 | 1988-02-03 | 王念赤 | Cleaning machine |
| TW420624B (en) * | 2000-01-26 | 2001-02-01 | Shim Yeeh Co Ltd | Integrated device for vacuumed/pressurized cleaning, drying and recycling |
| JP2011183325A (en) * | 2010-03-10 | 2011-09-22 | Miura Co Ltd | Washing apparatus |
| CN107161965A (en) * | 2017-04-21 | 2017-09-15 | 宜昌东圣磷复肥有限责任公司 | A kind of wet-process phosphoric acid concentration waste gas recovering device and its technique |
| CN107413745A (en) * | 2016-05-23 | 2017-12-01 | 惠州市鼎合智能装备有限公司 | The cleaning of electrokinetic cell and the method and system of cleaning agent recovery |
| CN211100442U (en) * | 2019-10-09 | 2020-07-28 | 遵义茶溶天下生物科技有限公司 | Cleaning machine of gastrodia elata |
| CN113458064A (en) * | 2021-07-20 | 2021-10-01 | 内蒙古大地云天化工有限公司 | Cleaning method for concentration system of phosphorus chemical production device |
-
2022
- 2022-05-26 CN CN202210584701.9A patent/CN114870419B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61107987A (en) * | 1984-10-30 | 1986-05-26 | Mitsubishi Heavy Ind Ltd | Method for washing multi-stage flash evaporation apparatus |
| CN87203198U (en) * | 1987-04-27 | 1988-02-03 | 王念赤 | Cleaning machine |
| TW420624B (en) * | 2000-01-26 | 2001-02-01 | Shim Yeeh Co Ltd | Integrated device for vacuumed/pressurized cleaning, drying and recycling |
| JP2011183325A (en) * | 2010-03-10 | 2011-09-22 | Miura Co Ltd | Washing apparatus |
| CN107413745A (en) * | 2016-05-23 | 2017-12-01 | 惠州市鼎合智能装备有限公司 | The cleaning of electrokinetic cell and the method and system of cleaning agent recovery |
| CN107161965A (en) * | 2017-04-21 | 2017-09-15 | 宜昌东圣磷复肥有限责任公司 | A kind of wet-process phosphoric acid concentration waste gas recovering device and its technique |
| CN211100442U (en) * | 2019-10-09 | 2020-07-28 | 遵义茶溶天下生物科技有限公司 | Cleaning machine of gastrodia elata |
| CN113458064A (en) * | 2021-07-20 | 2021-10-01 | 内蒙古大地云天化工有限公司 | Cleaning method for concentration system of phosphorus chemical production device |
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| CN114870419A (en) | 2022-08-09 |
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