CN114870419A - Method for improving cleaning efficiency of phosphoric acid flash evaporation chamber - Google Patents
Method for improving cleaning efficiency of phosphoric acid flash evaporation chamber Download PDFInfo
- Publication number
- CN114870419A CN114870419A CN202210584701.9A CN202210584701A CN114870419A CN 114870419 A CN114870419 A CN 114870419A CN 202210584701 A CN202210584701 A CN 202210584701A CN 114870419 A CN114870419 A CN 114870419A
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- China
- Prior art keywords
- cleaning
- evaporation chamber
- flash evaporation
- phosphoric acid
- flash
- 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 120
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 title claims abstract description 74
- 230000008020 evaporation Effects 0.000 title claims abstract description 49
- 238000001704 evaporation Methods 0.000 title claims abstract description 49
- 229910000147 aluminium phosphate Inorganic materials 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 27
- 239000002253 acid Substances 0.000 claims abstract description 26
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 230000001502 supplementing effect Effects 0.000 claims abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 239000000126 substance Substances 0.000 abstract description 4
- 238000009835 boiling Methods 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000002360 preparation method Methods 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
- 239000012535 impurity Substances 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
- 239000012530 fluid Substances 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 229910052731 fluorine Inorganic materials 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
Images
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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
The invention discloses a method for improving the cleaning efficiency of a phosphoric acid flash evaporation chamber, and relates to the technical field of cleaning of phosphoric acid concentration devices. A branch pipe is arranged on the acid inlet pipeline of the flash chamber and is connected with a compressed air supply device through a valve; after the flash evaporation chamber is used for boiling the phosphoric acid, cleaning liquid is replenished into the flash evaporation chamber from an acid inlet at the bottom of the flash evaporation chamber, and when overflowing from a high-position acid taking port, a phosphoric acid circulating pump is started to introduce compressed air into the flash evaporation chamber; stopping the supplement of the cleaning liquid after the whole flash chamber is filled with the cleaning liquid, and performing circulating cleaning; cleaning solution is emptied after cleaning; and supplementing the cleaning solution again for secondary circulating cleaning. The whole flash evaporation chamber is filled with cleaning liquid, a certain vacuum degree is kept, meanwhile, compressed air is supplemented, circulating cleaning is carried out, the cleaning liquid is in a motion state in the flash evaporation chamber due to the compressed air in the process, the upper part and the top of the flash evaporation chamber are continuously washed, the cleaning speed of scaling substances is accelerated, the cleaning time of the flash evaporation chamber is greatly shortened, and meanwhile, the cleaning effect of the inner wall of the flash evaporation chamber is also guaranteed.
Description
Technical Field
The invention relates to the technical field of cleaning of phosphoric acid concentration devices, in particular to a method for improving cleaning efficiency of a phosphoric acid flash evaporation chamber.
Background
The concentration process of the phosphoric acid mainly comprises the steps of heating dilute acid in a tubular heat exchanger by using low-pressure steam, then feeding the dilute acid 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, feeding part of the concentrated phosphoric acid serving as finished phosphoric acid into the next processing link, feeding part of the concentrated phosphoric acid serving as circulating acid into the tubular heat exchanger again through a circulating pump, feeding gas generated in the process into a demister, and feeding the treated tail gas into a fluorine absorption tower for tail gas treatment. With the development of the phosphorus chemical industry, the grade of phosphorite is gradually reduced, so that the content of impurities in phosphoric acid is continuously increased, such as iron, aluminum, magnesium and the like. In the concentration process, impurities are separated out in a crystallization mode along with the increase of the concentration of phosphoric acid, and scale is formed on the inner wall of concentration equipment, particularly in a flash evaporation chamber. As shown in fig. 1, the bottom acid inlet flash chamber foulant is more concentrated at the upper and middle positions of the apparatus. The scaling substance can fall off and enter the production system to block pipelines and equipment, so that the production efficiency is reduced, and the regular maintenance and cleaning are needed.
The patent CN113458064A discloses a cleaning method for a concentration system of a phosphorus chemical production device, wherein the circular cleaning is performed on the whole concentration system, cleaning acid is injected into the concentration system for circular cleaning, the temperature of the cleaning acid liquid is controlled to be 78-85 ℃, and the circular cleaning time is controlled to be 18-26 h. However, in practical use, it is found that since the flash chamber is filled with acid from the bottom, it is difficult to clean the top and the bottom of the flash chamber even if the flash chamber is filled with cleaning acid, and the effect after 25h of cleaning is shown in fig. 2. Therefore, there is a need to develop a method for improving the cleaning efficiency of the phosphoric acid flash chamber.
Disclosure of Invention
The invention aims to provide a method for improving the cleaning efficiency of a phosphoric acid flash evaporation chamber, and 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 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 flash evaporation chamber is emptied of phosphoric acid, filling cleaning liquid into the flash evaporation chamber from an acid inlet at the bottom of the flash evaporation chamber, starting a phosphoric acid circulating pump when overflowing from a high-position acid taking port, and simultaneously opening a valve to introduce compressed air into the flash evaporation chamber;
s3, stopping the filling of the cleaning liquid after the whole flash evaporation chamber is filled with the cleaning liquid, ensuring that the vacuum at the top of the flash evaporation chamber is not lower than 100kPa, and performing circulating cleaning;
s4, after cleaning for 4-6 hours, emptying the cleaning solution; and (S2) supplementing the cleaning solution again for secondary circulation cleaning, wherein the secondary circulation cleaning time is 11-12 hours.
The further technical scheme is that the pressure of the compressed air is 0.5Mpa, and the filling amount is 10-15 m 3 /h。
The further technical proposal is that the circulation volume of the cleaning fluid is 6000m 3 /h。
The further technical proposal is that the cleaning solution is H 2 SO 4 6 to 8 percent of solution.
The further technical scheme 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 evaporation chamber is characterized in that the whole flash evaporation chamber is filled with cleaning liquid, a certain vacuum degree is kept, compressed air is supplemented, circulating cleaning is carried out, the cleaning liquid is in a motion state in the flash evaporation chamber under the pressure of the compressed air in the process, the upper part and the top of the flash evaporation chamber are continuously washed, the cleaning speed of scaling substances is accelerated, the cleaning time of the flash evaporation chamber is greatly shortened, and meanwhile, the cleaning effect of the inner wall of the flash evaporation chamber is also ensured.
Drawings
FIG. 1 is a graph of internal fouling prior to cleaning of a prior art flash chamber.
FIG. 2 is a graph showing the scaling on the inner wall of the flash chamber after 25h of cleaning in the prior art.
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 described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A method for improving the cleaning efficiency of a phosphoric acid flash chamber comprises the following steps:
s1. preparation of H 2 SO 4 The solution with the concentration of 6.5 percent is used as a cleaning solution for standby.
S2, arranging a branch pipe on the 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 flash evaporation chamber is emptied of phosphoric acid, filling cleaning liquid into the flash evaporation chamber from an acid inlet at the bottom of the flash evaporation chamber, starting a phosphoric acid circulating pump when overflowing from a high-position acid taking port, and simultaneously opening a valve to introduce compressed air into the flash evaporation 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 liquid after the whole flash evaporation chamber is filled with the cleaning liquid, ensuring the vacuum at the top of the flash evaporation chamber to be 100kPa, and performing circulating cleaning, wherein the circulating amount of the cleaning liquid is 6000m 3 The circulating cleaning temperature is 80 ℃.
S5, after cleaning for 5 hours, emptying the cleaning solution; and (4) supplementing the cleaning solution again according to the step S3 to perform secondary circulation cleaning, wherein the secondary circulation cleaning time is 12 hours, and the circulation cleaning temperature is 85 ℃.
The situation of eliminating the scales in the flash chamber after cleaning is shown in figure 3, and the cleaning effect of the flash chamber after cleaning is far better than that of figure 2.
Example 2
A method for improving the cleaning efficiency of a phosphoric acid flash chamber comprises the following steps:
s1. preparation of H 2 SO 4 The solution with the concentration of 7% is used as a cleaning solution for standby.
S2, arranging a branch pipe on the 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 is boiled up in the flash evaporation chamber, the cleaning solution is fed into the acid from the bottom of the flash evaporation chamberThe port is supplemented into a flash chamber, when the high-level acid taking port overflows, a phosphoric acid circulating pump is started, meanwhile, a valve is opened, and compressed air is introduced 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 evaporation chamber is filled with the cleaning liquid, ensuring that the vacuum at the top of the flash evaporation chamber is more than 100kPa, and performing circulating cleaning, wherein the circulating amount of the cleaning liquid is 6000m 3 The circulating cleaning temperature is 82 ℃.
S5, after cleaning for 4 hours, emptying the cleaning solution; and (4) supplementing the cleaning solution again according to the step S3 to perform 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 comprises the following steps:
s1. preparation of H 2 SO 4 The solution with the concentration of 7.5 percent is used as a cleaning solution for standby.
S2, arranging a branch pipe on the 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 flash evaporation chamber is emptied of phosphoric acid, filling cleaning liquid into the flash evaporation chamber from an acid inlet at the bottom of the flash evaporation chamber, starting a phosphoric acid circulating pump when overflowing from a high-position acid taking port, and simultaneously opening a valve to introduce compressed air into the flash evaporation 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 evaporation chamber is filled with the cleaning liquid, ensuring that the vacuum at the top of the flash evaporation chamber is more than 100kPa, and performing circulating cleaning, wherein the circulating amount of the cleaning liquid is 6000m 3 The circulating cleaning temperature is 85 ℃.
S5, after cleaning for 6 hours, emptying the cleaning solution; and (5) supplementing the cleaning solution again according to the step S3 to perform 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 spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts or arrangements, other uses will also be apparent to those skilled in the art.
Claims (5)
1. A method for improving the cleaning efficiency of a phosphoric acid flash chamber 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 flash evaporation chamber is emptied of phosphoric acid, filling cleaning liquid into the flash evaporation chamber from an acid inlet at the bottom of the flash evaporation chamber, starting a phosphoric acid circulating pump when overflowing from a high-position acid taking port, and simultaneously opening a valve to introduce compressed air into the flash evaporation chamber;
s3, stopping the filling of the cleaning liquid after the whole flash evaporation chamber is filled with the cleaning liquid, ensuring that the vacuum at the top of the flash evaporation chamber is not lower than 100kPa, and performing circulating cleaning;
s4, after cleaning for 4-6 hours, emptying the cleaning solution; and (S2) supplementing the cleaning solution again for secondary circulation cleaning, wherein the secondary circulation cleaning time is 10-12 hours.
2. The method for improving the cleaning efficiency of the phosphoric acid flash chamber according to claim 1, wherein the method comprises the following steps: the compressed air pressure is 0.5Mpa, and the filling amount is 10-15 m 3 /h。
3. The method for improving the cleaning efficiency of the phosphoric acid flash chamber according to claim 1, wherein the method comprises the following steps: the circulation volume of the cleaning solution is 6000m 3 /h。
4. The method for improving the cleaning efficiency of the phosphoric acid flash chamber according to claim 1, wherein the method comprises the following steps: the cleaning solution is H 2 SO 4 6 to 8 percent of solution.
5. The method for improving the cleaning efficiency of the phosphoric acid flash chamber according to claim 1, wherein the method comprises the following steps: the circulating cleaning temperature is 80-85 ℃.
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 |
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| 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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| CN114870419A true CN114870419A (en) | 2022-08-09 |
| CN114870419B CN114870419B (en) | 2024-04-12 |
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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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| CN114870419B (en) | 2024-04-12 |
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