CN111256524A - Method for cleaning dirt and polymer in triple-effect heater tube - Google Patents
Method for cleaning dirt and polymer in triple-effect heater tube Download PDFInfo
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- CN111256524A CN111256524A CN202010035540.9A CN202010035540A CN111256524A CN 111256524 A CN111256524 A CN 111256524A CN 202010035540 A CN202010035540 A CN 202010035540A CN 111256524 A CN111256524 A CN 111256524A
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- triple
- effect heater
- triethylene glycol
- cleaning
- steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
Abstract
The invention provides a method for cleaning dirt and polymer in a triple-effect heater row tube, which comprises the steps of adding triethylene glycol into the triple-effect heater, heating the triethylene glycol to a certain temperature T, keeping the temperature for cooking for N hours, dissolving the dirt and the polymer in the triple-effect heater row tube, discharging the triethylene glycol from the triple-effect heater, and collecting the triethylene glycol, wherein the method has the advantages that the environment is not polluted, and the triethylene glycol can be recycled for next cleaning or recycling; and finally, only the cleaning solution is needed to wash the tube arrays in the triple-effect heater. The method comprises the following steps: the method can effectively dissolve dirt or polymer, has cleaner cleaning, convenient operation and easy control, and can reduce the cleaning frequency and the cost because the method can dissolve the dirt or the polymer and clean each time compared with a water jet.
Description
Technical Field
The invention relates to the technical field of cleaning of triple-effect heaters, in particular to a method for cleaning dirt and polymers in a triple-effect heater tube.
Background
At present, the concentration of extraction water adopts a triple-effect evaporation natural circulation system. Extracting water with the concentration of 10% is fed from the first effect, the extracting water is evaporated and concentrated by the third effect, and then the extracting water is depolymerized in a depolymerizing tower, the model DB10A11E05 of a third effect heater provides 10bar steam for heating, natural circulation is formed by heat convection, the evaporating water is evaporated, and the concentration of the concentrated extracting water is about 85%.
The triple-effect evaporation natural circulation system has slow circulation flow rate of the concentrated solution and low heat exchange efficiency; in addition, the extracted water contains various impurities with low filter diameter, oligomers, titanium dioxide, silicon oxide, metal ions and the like, so that the scale is easy to form on the heating tube array of the three-way heater. On the other hand, since the circulation flow rate of the concentrated solution is slow, the heating temperature of 10bar steam is high, and the chronic polymerization occurs at the tube array during long-term production. The fouling substances and polymers in the tubes are mainly titanium dioxide, silicon oxide and high polymers. These scales or polymers tend to block the tubes. At present, the tube array is cleaned by a water jet every two months on average, the tube array is cleaned once in 15 days when the cleaning frequency is highest, the tube array water jet which is blocked cannot be cleaned, and the scaling and polymerization of the tube array become more serious with the subsequent production. The prior art can not completely remove the scaling substances and polymers in the tube array, the normal production and use efficiency of the whole recovery system are seriously influenced, and the subsequent more serious consequence is that the whole heater is replaced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for cleaning dirt and polymers in a triple-effect heater tube array, which can thoroughly clean the dirt and polymers in the triple-effect heater tube array, is convenient to operate and easy to control, and reduces the cleaning frequency, thereby reducing the cost.
The invention is realized by the following steps: a method of cleaning scale and polymer from within a triple effect heater array comprising:
step S1, opening a top cover of the triple-effect heater, and closing each external discharge port switch of the triple-effect heater;
step S2, pouring triethylene glycol into the triple-effect heater, and then closing the top cover;
step S3, heating triethylene glycol to the temperature T, and keeping cooking for N hours;
step S4, stopping heating the triethylene glycol, opening the top cover and each external discharge port switch of the triple-effect heater, and discharging the triethylene glycol in the triple-effect heater completely;
and step S5, cleaning the tubes of the triple-effect heater with cleaning liquid.
Further, in step S2, triethylene glycol is added to 2/3 of the triple effect heater tube.
Further, in the step S3, the temperature T is 240 ℃; and N is 10 h.
Further, the step S3 is specifically: connecting a steam heating circulating device to the triple-effect heater, adjusting the temperature of the steam heating circulating device to 200 ℃, controlling the flow at 500kg/h, opening a superheated steam hand valve of the steam heating circulating device for heating, and inputting high-temperature steam into the triple-effect heater; the temperature of the post-steam is raised to 240 ℃, and the temperature of the triethylene glycol in the triple-effect heater is kept at 240 ℃ for 10 hours.
Further, in the step S3, the pressure of the steam input into the triple-effect heater is 10 bar.
Further, in step S5, the cleaning solution is desalted water.
The invention has the following advantages: the invention relates to a method for cleaning dirt and polymer in a triple-effect heater array tube, which is characterized in that triethylene glycol is added into the triple-effect heater, the triethylene glycol is heated to a certain temperature T and then kept to be cooked for N hours, so that the dirt and the polymer in the triple-effect heater array tube are dissolved, then the triethylene glycol is discharged from the triple-effect heater, and the triethylene glycol is collected, so that the environment is not polluted, and the triethylene glycol can be recycled for next cleaning or recycling; and finally, only the cleaning solution is needed to wash the tube arrays in the triple-effect heater. The method comprises the following steps: the method can effectively dissolve dirt or polymer, has cleaner cleaning, convenient operation and easy control, and can reduce the cleaning frequency and the cost because the method can dissolve the dirt or the polymer and clean each time compared with a water jet.
Drawings
The invention will be further described with reference to the following examples with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of a triple-effect heater according to the present invention.
Fig. 2 is a flowchart of a first embodiment of the method according to the present invention.
Fig. 3 is a flowchart of a second embodiment of the method of the present invention.
Description of reference numerals:
a triple-effect heater 1, a steam heating circulating device 2 and an extraction tower 3.
Detailed Description
The general idea of the invention is as follows: adding triethylene glycol into the triple-effect heater, heating the triethylene glycol to a certain temperature T, and keeping the triple-effect heater for cooking for N hours, so that dirt and polymers in the tubes of the triple-effect heater are dissolved, then discharging the triethylene glycol from the triple-effect heater, and collecting the triethylene glycol, wherein the triethylene glycol is not polluted, and can be recycled for next cleaning or recycling; and finally, only the cleaning solution is needed to wash the tube arrays in the triple-effect heater. Compared with the existing water jet knife for cleaning, the water jet knife has the defect that dirt or polymer cannot be completely cleaned in the cleaning process, and the scale or polymer after being blocked is more difficult to clean and can be discarded and replaced only after being blocked to a certain degree; the method comprises the following steps: the method can effectively dissolve dirt or polymer, has cleaner cleaning, convenient operation and easy control, and can dissolve the dirt or the polymer by adopting a chemical dissolving mode, and the cleaning is cleaner than a water jet every time, so the cleaning frequency can be reduced, thereby the cost is reduced.
Please refer to fig. 1 to 3.
The invention discloses a method for cleaning dirt and polymers in a triple-effect heater tube, which comprises the following steps:
step S1, opening a top cover of the triple-effect heater 1, and closing each external discharge port switch of the triple-effect heater 1;
step S2, pouring triethylene glycol into the triple-effect heater 1, and then closing the top cover;
step S3, heating triethylene glycol to the temperature T, and keeping cooking for N hours;
step S4, stopping heating the triethylene glycol, opening the top cover and each external discharge port switch of the triple-effect heater 1, and discharging the triethylene glycol in the triple-effect heater 1;
and step S5, cleaning the tubes of the triple-effect heater 1 by cleaning liquid.
In the implementation, a preferred embodiment is as follows: in step S2, triethylene glycol is added to 2/3 of the tube of the triple effect heater 1.
In the step S3, the temperature T is 240 ℃; and N is 10 h.
The step S3 specifically includes: a steam heating circulating device 2 is connected to the three-effect heater 1, the temperature of the steam heating circulating device 2 is firstly adjusted to 200 ℃, the flow is controlled to be 500kg/h, a superheated steam hand valve of the steam heating circulating device 2 is opened for heating, and high-temperature steam is input into the three-effect heater 1; raising the temperature of the steam to 240 ℃, keeping the temperature of the triethylene glycol in the triple-effect heater 1 at 240 ℃ for 10 hours; the heating principle is as follows: the tube array is positioned in the inner container of the triple-effect heater, the inner container and the shell of the triple-effect heater are provided with a cavity, high-temperature steam enters the cavity to heat the inner container, so that triethylene glycol in the inner container is heated, and condensed water after heat exchange flows out of the cavity to flow back into the steam heating circulating device 2 to be circularly heated. In a specific embodiment, the steam heating cycle device 2 adopts an existing superheated steam electric heater, and the model is as follows: ROB-H-130/380.
In step S3, the pressure of the steam input into the triple-effect heater 1 is 10 bar.
In step S5, the cleaning solution is desalted water.
Examples
Firstly, testing: taking 50g of dirt and polymer on the array tube, putting the array tube into a 100mL beaker, then heating 50mL of triethylene glycol in the beaker, putting the beaker into a heating box, heating to 240 ℃, keeping the temperature at 240 ℃ for 10 hours, taking out the beaker, and directly observing the dissolution of the dirt and the polymer in the beaker by naked eyes. And (4) conclusion: the chemical reaction of triethylene glycol and dirt and polymer can dissolve the dirt and polymer, and the test is feasible.
Secondly, the method of the invention is adopted to actually clean the triethylene glycol used for the 1-column tube of the triple-effect heater:
firstly, the existing triple-effect evaporation natural circulation system comprises an extraction tower 3, a triple-effect heater 1 and a steam heating circulation device 2, hot steam is input into the triple-effect heater 1 through a pipeline in the actual production of the existing steam heating circulation device 2 to heat the triple-effect heater, and cold cooling water after heat exchange flows back into the steam heating circulation device 2 through the pipeline, so that circulating heating is formed.
Secondly, the existing triple-effect evaporation natural circulation system is modified, and because the requirements for cleaning and generating the required hot steam are different, in order to not change the hot steam pipeline for generating (if the existing hot steam pipeline for production is adopted, the parameters of components of the pipeline need to be reset after cleaning), the hot steam pipeline is connected to the steam heating circulation device 2, and then connected to the triple-effect heater in parallel.
And finally, cleaning:
step S1, opening a top cover of the triple-effect heater 1, and closing each external discharge port switch of the triple-effect heater 1;
step S2, pouring triethylene glycol into the triple-effect heater 1, adding the triethylene glycol to the position 2/3 of the tubes of the triple-effect heater 1, wherein the triethylene glycol is not fully added because the triethylene glycol expands after being heated, so that a space is reserved for the expansion of the triethylene glycol to prevent the triple-effect heater from being expanded, and then closing the top cover;
step S3, adjusting the temperature of the steam heating circulating device 2 to 200 ℃, controlling the flow at 500kg/h, opening a superheated steam hand valve of the steam heating circulating device 2 for heating, inputting high-temperature steam into the triple-effect heater 1, and controlling the pressure of the steam input into the triple-effect heater 1 to be 10 bar; raising the temperature of the steam to 240 ℃, keeping the temperature of the triethylene glycol in the triple-effect heater 1 at 240 ℃ for 10 hours;
step S4, stopping heating the triethylene glycol, opening the top cover and each external discharge port switch of the triple-effect heater 1, discharging the triethylene glycol in the triple-effect heater 1 completely, collecting the triethylene glycol by using a barrel, preventing the environment from being polluted, and recycling the triethylene glycol at the same time;
step S5, then cleaning the tubes of the triple-effect heater 1 by desalted water.
After cleaning was complete, the triple effect heater was visually observed for the absence of soil or polymer.
Although specific embodiments of the invention have been described above, it will be understood by those skilled in the art that the specific embodiments described are illustrative only and are not limiting upon the scope of the invention, and that equivalent modifications and variations can be made by those skilled in the art without departing from the spirit of the invention, which is to be limited only by the appended claims.
Claims (6)
1. A method of cleaning fouling and polymer from within a triple effect heater array tube, comprising: the method comprises the following steps:
step S1, opening a top cover of the triple-effect heater, and closing each external discharge port switch of the triple-effect heater;
step S2, pouring triethylene glycol into the triple-effect heater, and then closing the top cover;
step S3, heating triethylene glycol to the temperature T, and keeping cooking for N hours;
step S4, stopping heating the triethylene glycol, opening the top cover and each external discharge port switch of the triple-effect heater, and discharging the triethylene glycol in the triple-effect heater completely;
and step S5, cleaning the tubes of the triple-effect heater with cleaning liquid.
2. The method of claim 1, wherein the cleaning solution comprises a cleaning solution comprising: in step S2, triethylene glycol is added to the tube 2/3 of the triple effect heater.
3. A method of cleaning soil and polymers from within a triple effect heater column according to claim 2, wherein: in the step S3, the temperature T is 240 ℃; and N is 10 h.
4. A method of cleaning soil and polymers in a triple effect heater array according to claim 3, wherein: the step S3 specifically includes: connecting a steam heating circulating device to the triple-effect heater, adjusting the temperature of the steam heating circulating device to 200 ℃, controlling the flow at 500kg/h, opening a superheated steam hand valve of the steam heating circulating device for heating, and inputting high-temperature steam into the triple-effect heater; the temperature of the post-steam is raised to 240 ℃, and the temperature of the triethylene glycol in the triple-effect heater is kept at 240 ℃ for 10 hours.
5. The method of claim 4, wherein the cleaning solution comprises a cleaning solution comprising: in step S3, the pressure of the steam input into the triple effect heater is 10 bar.
6. A method of cleaning soil and polymers in a triple effect heater array tube according to any one of claims 1 to 5, wherein: in step S5, the cleaning solution is desalted water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035540.9A CN111256524A (en) | 2020-01-14 | 2020-01-14 | Method for cleaning dirt and polymer in triple-effect heater tube |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035540.9A CN111256524A (en) | 2020-01-14 | 2020-01-14 | Method for cleaning dirt and polymer in triple-effect heater tube |
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| CN111256524A true CN111256524A (en) | 2020-06-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112590053A (en) * | 2020-12-29 | 2021-04-02 | 宁波艾克姆新材料有限公司 | Pre-dispersion master batch production coloring machine based on thermal cycle utilization |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2696702Y (en) * | 2004-03-25 | 2005-05-04 | 李侃 | Three-effect concentrator |
| CN103424029A (en) * | 2012-05-22 | 2013-12-04 | 中国石油化工股份有限公司 | Direct-spinning polyester filament yarn tube-type heat exchanger on-line cleaning method |
| CN104088021A (en) * | 2014-07-29 | 2014-10-08 | 张家港锦亿化纤有限公司 | Triethylene glycol cleaning device |
| WO2019173062A1 (en) * | 2018-03-07 | 2019-09-12 | Trucapsol, Llc | Reduced permeability microcapsules |
-
2020
- 2020-01-14 CN CN202010035540.9A patent/CN111256524A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2696702Y (en) * | 2004-03-25 | 2005-05-04 | 李侃 | Three-effect concentrator |
| CN103424029A (en) * | 2012-05-22 | 2013-12-04 | 中国石油化工股份有限公司 | Direct-spinning polyester filament yarn tube-type heat exchanger on-line cleaning method |
| CN104088021A (en) * | 2014-07-29 | 2014-10-08 | 张家港锦亿化纤有限公司 | Triethylene glycol cleaning device |
| WO2019173062A1 (en) * | 2018-03-07 | 2019-09-12 | Trucapsol, Llc | Reduced permeability microcapsules |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112590053A (en) * | 2020-12-29 | 2021-04-02 | 宁波艾克姆新材料有限公司 | Pre-dispersion master batch production coloring machine based on thermal cycle utilization |
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Application publication date: 20200609 |
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