CN110614256A - Anti-crystallization device for liquid caustic soda head tank pipeline and application thereof - Google Patents
Anti-crystallization device for liquid caustic soda head tank pipeline and application thereof Download PDFInfo
- Publication number
- CN110614256A CN110614256A CN201810629537.2A CN201810629537A CN110614256A CN 110614256 A CN110614256 A CN 110614256A CN 201810629537 A CN201810629537 A CN 201810629537A CN 110614256 A CN110614256 A CN 110614256A
- Authority
- CN
- China
- Prior art keywords
- caustic soda
- liquid
- pipeline
- purging
- liquid caustic
- 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.)
- Pending
Links
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 title claims abstract description 169
- 239000007788 liquid Substances 0.000 title claims abstract description 93
- 235000011121 sodium hydroxide Nutrition 0.000 title claims abstract description 56
- 238000002425 crystallisation Methods 0.000 title claims abstract description 31
- 238000010926 purge Methods 0.000 claims abstract description 50
- 230000001105 regulatory effect Effects 0.000 claims description 19
- 230000008025 crystallization Effects 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 12
- 238000004140 cleaning Methods 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims description 3
- 230000003111 delayed effect Effects 0.000 claims description 2
- 239000003518 caustics Substances 0.000 claims 4
- 239000003513 alkali Substances 0.000 abstract description 18
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000001556 precipitation Methods 0.000 abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 2
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/001—Feed or outlet devices as such, e.g. feeding tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J4/00—Feed or outlet devices; Feed or outlet control devices
- B01J4/02—Feed or outlet devices; Feed or outlet control devices for feeding measured, i.e. prescribed quantities of reagents
-
- 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
- B08B2230/00—Other cleaning aspects applicable to all B08B range
- B08B2230/01—Cleaning with steam
Abstract
The invention relates to an anti-crystallization device for a liquid caustic soda head tank pipeline and application thereof. The anti-crystallization device comprises a steam purging unit and a metering unit; the steam purging unit comprises a steam purging branch pipe, a purging cut-off valve positioned on the steam purging branch pipe, and a liquid discharge cut-off valve positioned at a liquid outlet of the liquid caustic soda elevated tank. By adopting the anti-crystallization device, a small amount of steam can be used for quickly removing the residual liquid caustic soda in the pipeline, so that the pipeline blockage caused by the precipitation of the liquid caustic soda at a low temperature is avoided, and the pipeline blockage caused by the precipitation of the caustic soda due to the loss of water in the residual liquid caustic soda after the equipment is stopped for a long time is also avoided. Meanwhile, the anti-crystallization device can convey all the predicted liquid caustic soda into the next reaction system, thereby avoiding the residual liquid caustic soda in the pipeline, improving the utilization rate of raw materials and ensuring the accurate metering of alkali addition.
Description
Technical Field
The invention relates to an anti-crystallization device for a liquid caustic soda elevated tank pipeline and application thereof, belonging to the technical field of pipeline equipment.
Background
The elevated tank is widely applied to the field of fine chemical reaction synthesis, and is particularly used for storing and providing liquid caustic soda with the mass concentration of more than 30% for the synthesis reaction. The liquid caustic soda is added into the reaction kettle in the elevated tank through an automatic cut-off valve, a flowmeter and a regulating valve.
Due to the characteristics of the liquid caustic soda, when the weather is low temperature, the liquid caustic soda can be gradually condensed and block the pipeline, so that the pipeline is gradually blocked, the caustic soda adding precision is influenced, and even the pipeline is blocked and the caustic soda can not be added under severe conditions. In addition, the head tank is usually used intermittently, and after a certain residence time, the liquid caustic soda in the caustic soda adding pipeline gradually precipitates, resulting in pipeline blockage. When a pipeline is blocked, the existing method usually adopts a manual disassembly mode to dredge the pipeline, but has the problems of long time, easy personal injury and the like.
CN205393121U discloses an automatic crystallization device that prevents of liquid caustic soda elevated tank tapping pipeline, the device adopts pure water to carry out self-cleaning. However, the pure water cleaning effect is poor, the cost is high, the amount of waste water generated after cleaning is large, and a large amount of high-alkalinity waste water brings a problem to waste water treatment.
Disclosure of Invention
The invention provides a novel liquid discharge anti-crystallization device for an elevated tank, aiming at solving the technical problems of the existing elevated tank liquid discharge alkali pipeline. The crystallization prevention device has the advantages of low operation cost, high washing speed, less generated wastewater, no residue of alkali liquor and the like, thereby avoiding the condition of downstream concentration fluctuation caused by introducing impurities into a reaction system in the prior art and reducing equipment corrosion; meanwhile, by matching with the weighing equipment and the reasonable application of the instrument valve, the accurate metering of liquid adding is ensured, and multiple effects are achieved.
The technical scheme of the invention is as follows.
An anti-crystallization device for a liquid caustic soda head tank pipeline comprises: a steam purging unit and a metering unit; wherein, the steam sweeps the unit and sweeps the trip valve including steam sweeps the branch pipe, is located steam and sweeps on the branch pipe to and be located the tapping trip valve of liquid caustic soda elevated tank liquid outlet department.
The metering unit comprises a weighing module and a liquid discharge regulating valve connected with the weighing module; the weighing module is connected with the liquid caustic soda elevated tank, and the liquid discharge regulating valve is positioned on the liquid caustic soda conveying pipeline. The invention adopts a weighing module to measure the flow, namely the flow of the added alkali is obtained by the weight loss principle and the data processing after the weighing; compared with other existing metering modes, the metering method can avoid some special structures in the pipeline as much as possible, maximize the smoothness degree of the pipeline, further ensure the flow rate of the alkali, and completely avoid the damage of actions of purging and flushing to the instrument.
The steam purging branch pipe is a branch of a pipeline between the liquid discharge stop valve and the liquid discharge regulating valve.
The invention also provides application of the crystallization prevention device in crystallization prevention of liquid caustic soda elevated tank pipelines.
Wherein, the application specifically comprises: when the alkali is added, the crystallization-preventing device is used for cleaning the pipeline liquid alkali (namely, the liquid alkali crystallization is prevented); or, in the alkali adding process, when the liquid alkali cannot flow normally due to an abnormal state and the liquid alkali crystals block the pipeline, the crystallization prevention device is used for cleaning the pipeline liquid alkali (namely, the liquid alkali crystals are eliminated).
The invention also provides a method for preventing the liquid caustic soda elevated tank pipeline from crystallizing, and the anti-crystallizing device is used for carrying out steam purging on the liquid caustic soda elevated tank pipeline.
The method for preventing the liquid caustic soda elevated tank pipeline from crystallizing comprises the following steps:
(1) closing the liquid discharge stop valve, opening the liquid discharge regulating valve, opening the purging stop valve, allowing steam to enter the steam purging branch pipe, and performing steam purging on the liquid caustic soda elevated tank pipeline;
(2) and after the purging is finished, closing the purging cut-off valve and closing the liquid discharge regulating valve in a delayed manner.
The invention has the following beneficial effects:
(1) by adopting the anti-crystallization device, residual liquid caustic soda in the pipeline can be removed in time through steam purging, so that pipeline blockage caused by precipitation of the liquid caustic soda at low temperature is avoided; meanwhile, the problem that the pipeline is blocked due to alkali precipitation caused by water loss in residual liquid alkali after the equipment is stopped for a long time can be avoided. The steam purge advantages are shown in table 1.
TABLE 1
(2) By utilizing the anti-crystallization device, the predicted liquid caustic soda can be completely conveyed to the next reaction system, the liquid caustic soda residue in a pipeline is avoided, the utilization rate of raw materials is improved, and the accurate metering of alkali addition is also ensured.
(3) The anti-crystallization device provided by the invention is used for steam purging of the liquid caustic soda pipeline, and can replace a long-time high-temperature heat tracing mode used by the conventional liquid caustic soda pipeline, so that the pipeline corrosion caused by high-temperature liquid caustic soda is avoided. The effect ratio of the heat tracing mode and the steam purging mode on the corrosion of the pipeline is shown in table 2.
TABLE 2
Note: 1. the testing time is once a half year; 2. the thickness is in millimeters.
Drawings
Fig. 1 is a schematic structural diagram of an anti-crystallization device according to the present invention.
In fig. 1: 1. a liquid caustic soda elevated tank; 2. a weighing module; 3. steam purging the branch pipe; 4. a purging cut-off valve; 5. a liquid discharge cut-off valve; 6. liquid discharging regulating valve.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Embodiment 1 a crystallization preventing device for liquid caustic soda elevated tank pipeline
The embodiment provides a crystallization-preventing device for a liquid caustic soda head tank pipeline, which is shown in fig. 1 and comprises: a steam purging unit and a metering unit;
the steam purging unit comprises a steam purging branch pipe 3, a purging cut-off valve 4 positioned on the steam purging branch pipe 3 and a liquid discharging cut-off valve 5 positioned at a liquid outlet of the liquid caustic soda elevated tank 1.
The metering unit comprises a weighing module 2 and a liquid discharge regulating valve 6 connected with the weighing module; the weighing module 2 is connected with the liquid caustic soda overhead tank 1, and the liquid discharge regulating valve 6 is positioned on a liquid caustic soda conveying pipeline;
the steam purging branch pipe 3 is a branch of a pipeline between the liquid discharge stop valve 5 and the liquid discharge regulating valve 6.
Embodiment 2 a method for preventing liquid caustic soda elevated tank pipeline from crystallizing by using the crystallization preventing device
The present embodiment provides a method for preventing crystallization of a pipe of a liquid caustic soda head tank (cleaning of the pipe after adding caustic soda) by using the crystallization prevention device, including:
(1) after the alkali is added, closing the liquid discharge stop valve, opening the valve opening of the liquid discharge regulating valve to 100%, opening the purging stop valve, allowing steam to enter the steam purging branch pipe, and performing steam purging on the liquid alkali elevated tank pipeline;
(2) and after purging is finished, closing the purging stop valve, delaying for a certain time to set the opening of the liquid discharge regulating valve to be 0, and finishing the whole purging step.
Embodiment 3 a method for preventing liquid caustic soda elevated tank pipeline from crystallizing by using the crystallization preventing device
The present embodiment provides a method for preventing crystallization of a conduit of a liquid caustic soda head tank (conduit blockage caused by abnormal conditions during the process of adding caustic soda) by using the crystallization-preventing device, comprising:
(1) when the liquid is added abnormally, the liquid discharge cut-off valve is closed, the valve opening of the liquid discharge regulating valve is opened to 100%, the purging cut-off valve is opened, steam enters the steam purging branch pipe, and steam purging is carried out on the liquid caustic soda elevated tank pipeline;
(2) and after purging is finished, closing the purging stop valve, delaying for a certain time to set the opening of the liquid discharge regulating valve to be 0, and finishing the whole purging step.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (7)
1. The utility model provides a prevent crystallization device for liquid caustic soda elevated tank pipeline which characterized in that includes: a steam purging unit and a metering unit;
the steam purging unit comprises a steam purging branch pipe, a purging cut-off valve positioned on the steam purging branch pipe, and a liquid discharge cut-off valve positioned at a liquid outlet of the liquid caustic soda elevated tank.
2. The anti-crystallization device according to claim 1, wherein the metering unit comprises a weighing module and a tapping regulating valve connected with the weighing module; the weighing module is connected with the liquid caustic soda elevated tank, and the liquid discharge regulating valve is positioned on the liquid caustic soda conveying pipeline.
3. The anti-crystallization device according to claim 1 or 2, wherein the steam purge branch is a branch of a pipeline between the tapping shut-off valve and a tapping regulating valve of the metering unit.
4. Use of the crystallization prevention device according to any one of claims 1 to 3 in the crystallization prevention of liquid caustic soda head tank pipelines.
5. The use of claim 4, wherein the use comprises cleaning of the pipe caustic after the addition of caustic is complete, cleaning of the pipe caustic when an abnormal condition occurs during the addition of caustic.
6. A method for preventing the crystallization of a liquid caustic soda elevated tank pipeline, which is characterized in that the liquid caustic soda elevated tank pipeline is subjected to steam purging by using the crystallization-preventing device of any one of claims 1 to 3.
7. The method of claim 6, comprising:
(1) closing the liquid discharge stop valve, opening the liquid discharge regulating valve, opening the purging stop valve, allowing steam to enter the steam purging branch pipe, and performing steam purging on the liquid caustic soda elevated tank pipeline;
(2) and after the purging is finished, closing the purging cut-off valve and closing the liquid discharge regulating valve in a delayed manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810629537.2A CN110614256A (en) | 2018-06-19 | 2018-06-19 | Anti-crystallization device for liquid caustic soda head tank pipeline and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810629537.2A CN110614256A (en) | 2018-06-19 | 2018-06-19 | Anti-crystallization device for liquid caustic soda head tank pipeline and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110614256A true CN110614256A (en) | 2019-12-27 |
Family
ID=68920049
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810629537.2A Pending CN110614256A (en) | 2018-06-19 | 2018-06-19 | Anti-crystallization device for liquid caustic soda head tank pipeline and application thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110614256A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112024540A (en) * | 2020-08-20 | 2020-12-04 | 天伟化工有限公司 | One-key blowing automatic control method for molten alkali pipeline in caustic soda production |
| CN112058825A (en) * | 2020-08-20 | 2020-12-11 | 天伟化工有限公司 | Automatic control method for pipeline purging in caustic soda production |
| CN113911580A (en) * | 2021-10-19 | 2022-01-11 | 唐山三友化工股份有限公司 | Anti-crystallization water sealing device applied to ammonia-containing medium storage barrel and medium recovery method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201723976U (en) * | 2010-06-10 | 2011-01-26 | 中国铝业股份有限公司 | Dredging device of high-concentration caustic soda liquid delivering pipeline |
| CN205308286U (en) * | 2016-01-12 | 2016-06-15 | 长乐力恒锦纶科技有限公司 | Sodium hydroxide solution measurement system prevents crystallization device |
| CN205576040U (en) * | 2016-04-08 | 2016-09-14 | 云南煤业能源股份有限公司 | Coking liquid caustic soda is storage feedway for desulfurization |
-
2018
- 2018-06-19 CN CN201810629537.2A patent/CN110614256A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201723976U (en) * | 2010-06-10 | 2011-01-26 | 中国铝业股份有限公司 | Dredging device of high-concentration caustic soda liquid delivering pipeline |
| CN205308286U (en) * | 2016-01-12 | 2016-06-15 | 长乐力恒锦纶科技有限公司 | Sodium hydroxide solution measurement system prevents crystallization device |
| CN205576040U (en) * | 2016-04-08 | 2016-09-14 | 云南煤业能源股份有限公司 | Coking liquid caustic soda is storage feedway for desulfurization |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112024540A (en) * | 2020-08-20 | 2020-12-04 | 天伟化工有限公司 | One-key blowing automatic control method for molten alkali pipeline in caustic soda production |
| CN112058825A (en) * | 2020-08-20 | 2020-12-11 | 天伟化工有限公司 | Automatic control method for pipeline purging in caustic soda production |
| CN113911580A (en) * | 2021-10-19 | 2022-01-11 | 唐山三友化工股份有限公司 | Anti-crystallization water sealing device applied to ammonia-containing medium storage barrel and medium recovery method |
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