CN113367373B - Cleaning control method for paper-making reconstituted tobacco leaching liquid membrane separation equipment - Google Patents
Cleaning control method for paper-making reconstituted tobacco leaching liquid membrane separation equipment Download PDFInfo
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- CN113367373B CN113367373B CN202110768954.7A CN202110768954A CN113367373B CN 113367373 B CN113367373 B CN 113367373B CN 202110768954 A CN202110768954 A CN 202110768954A CN 113367373 B CN113367373 B CN 113367373B
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- soaking
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/14—Forming reconstituted tobacco products, e.g. wrapper materials, sheets, imitation leaves, rods, cakes; Forms of such products
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
- A24B15/18—Treatment of tobacco products or tobacco substitutes
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
- A24B15/18—Treatment of tobacco products or tobacco substitutes
- A24B15/24—Treatment of tobacco products or tobacco substitutes by extraction; Tobacco extracts
Abstract
The invention discloses a cleaning control method for a paper-making reconstituted tobacco leaching liquid membrane separation device, which is characterized in that two cleaning modes which can be executed by user decision are designed to realize daily washing maintenance and deep cleaning after shutdown of the membrane separation device, and specifically the cleaning modes can be divided into a washing mode and a soaking mode, wherein the washing mode mainly executes a set clear water washing process, and is changed into a chemical washing process which is alternatively executed according to a set link after being washed by clear water for a certain number of times; the soaking mode mainly utilizes a chemical solvent to soak for a long time, and utilizes a centrifugal pump to perform chemical washing in a soaking gap.
Description
Technical Field
The invention relates to the field of tobacco processing, in particular to a cleaning control method for a paper-making reconstituted tobacco leaching liquid membrane separation device.
Background
In the production process of paper-making reconstituted tobacco, if suspended matters and macromolecular substances in the leaching solution can not be effectively removed, the suspended matters and the macromolecular substances are easy to adhere and scale on the tubes of a heat exchanger in the subsequent evaporation concentration process, so that the problems of increased heat transfer resistance, increased loss of aroma substances, shortened cleaning period of evaporation concentration equipment, increased steam consumption and the like are caused. Too much macromolecular substances and suspended matters can also cause the viscosity of concentrated solution to rise, influence the coating rate to be stable, cause the quality problems of poor product softness, easy surface adhesion, white core generation and the like, and meanwhile, macromolecular substances such as pectin, protein and the like can generate aldehydes, nitriles, nitrogen-containing heterocyclic compounds and phenolic compounds in the pyrolysis process to influence the sensory quality and the safety of reconstituted tobacco products.
The membrane separation technology is a new multidisciplinary crossed high-new technology, wherein the silicon carbide ceramic membrane separation technology is industrially applied in the production process of the reconstituted tobacco by the paper-making method, and the leaching solution after impurity removal and purification is used for accurately separating macromolecular substances such as protein, pectin, saccharides and the like through a silicon carbide ultrafiltration membrane, so that the influence of the macromolecular substances on the subsequent evaporation and concentration efficiency can be greatly reduced, and the internal quality of the reconstituted tobacco product can be effectively improved. However, the leaching solution for the reconstituted tobacco is complex in component, after the silicon carbide ceramic membrane separation equipment operates for a period of time, the surface of the membrane tube is covered by a scale layer, the membrane flux and the separation effect are greatly reduced, and the continuous and stable operation of production is seriously influenced.
At present, common cleaning methods for silicon carbide ceramic membranes mainly comprise physical methods and chemical methods, however, due to different scale layer components, the applicability of the existing cleaning methods and cleaning agents to membrane separation equipment for paper-making reconstituted tobacco is poor, the cleaning effect is difficult to guarantee, membrane tubes are more precise compared with other industrial equipment, the cleaning steps are complex, cleaning operators are required to have higher professional levels, if the manual intervention of each cleaning step is more, the probability of misoperation or improper operation is higher, and huge hidden dangers are brought to stable operation of leaching liquid membrane separation equipment and the whole line.
Disclosure of Invention
Therefore, the invention aims to provide a cleaning control method for the paper-making reconstituted tobacco leaching liquid film separation equipment, which can realize the online automatic cleaning of the leaching liquid film separation equipment, is simple and convenient to operate, can effectively ensure the cleaning effect, simultaneously converts manual operation into automatic control, avoids the problems of equipment damage, production stagnation and the like caused by manual misoperation, mistaken cleaning or untimely cleaning, and simultaneously can increase the total operation time of the membrane separation equipment by the design of a chemical soaking mode, thereby improving the effective operation rate of the equipment.
The technical scheme adopted by the invention is as follows:
a cleaning control method for a paper-making reconstituted tobacco leaching liquid membrane separation device comprises the following steps:
monitoring a cleaning mode instruction sent by a user in real time, wherein the cleaning mode instruction comprises a flushing mode instruction or a soaking mode instruction;
continuously detecting the clear liquid flow of a membrane tube of the membrane separation equipment after receiving a flushing mode instruction;
when the clear water flow of the membrane tube is lower than a preset flow threshold value, triggering the centrifugal pump to operate, pumping clear water with a first temperature value through the centrifugal pump in a pressurizing mode, and sequentially performing corresponding forward clear water washing and reverse clear water washing on the membrane tube according to first set time and second set time;
recording the number of times of rinsing with clear water as one time after one round of rinsing with clear water in the forward direction and rinsing with clear water in the reverse direction are finished;
when the number of times of rinsing with clear water is accumulated to reach the preset number, executing chemical rinsing; the chemical rinse includes: sequentially performing washing, alkali washing, acid washing, washing and flushing for five forward directions on the membrane tube A times, B times, C times, D times and E times; wherein, the alkali cleaning adopts alkaline cleaning solution with a first concentration, the acid cleaning adopts acidic cleaning solution with a second concentration, and A, B, C, D, E is respectively set times;
after the last washing link of the chemical washing is finished, filling clean water with a second temperature value inside and outside the membrane tube for soaking protection, and triggering a drain valve of the membrane separation equipment to open to discharge the clean water for soaking before the membrane separation equipment works;
after receiving a soaking mode instruction, injecting a prefabricated soaking solvent into the interior and exterior of the membrane tube, and executing soaking treatment according to preset soaking duration;
in the soaking treatment process, triggering the centrifugal pump to operate according to a preset operation period, pumping a soaking solvent through the centrifugal pump under pressure, and washing the membrane tube;
and after the soaking treatment is finished, the membrane tube is washed by clean water, the inside and the outside of the membrane tube are filled with the clean water with the second temperature value for soaking protection after the clean water is washed, and a sewage valve of the membrane separation equipment is triggered to open to discharge the clean water for soaking before the membrane separation equipment works.
In at least one possible implementation manner, the method further includes:
and in the soaking mode, monitoring the temperature and/or the pressure of the used cleaning liquid in real time, triggering a drain valve of the membrane separation equipment to open when the temperature or the pressure exceeds a preset warning limit value, and closing the drain valve after a preset opening duration is reached.
In at least one possible implementation, a ═ 2, B ═ 1, C ═ 2, D ═ 1, and E ═ 2.
In at least one possible implementation manner, the first temperature value is 40 ℃ to 50 ℃, and the second temperature value is 20 ℃ to 25 ℃.
In at least one possible implementation manner, the first set time is 3 minutes to 5 minutes, and the second set time is 4 minutes to 6 minutes.
In at least one possible implementation manner, the preformed alkaline cleaning solution with the first concentration is a NaOH solution with a concentration of 5% to 8%.
In at least one possible implementation manner, the preformed acidic cleaning solution with the second concentration is a sulfamic acid solution with a concentration of 5% to 8%.
In at least one possible implementation manner, the prepared soaking solvent is a NaOH solution with a concentration of 8% to 10%.
In at least one possible implementation, the soaking time is 20 hours to 24 hours. In at least one possible implementation, the operation period is that the centrifugal pump is started every 4 hours, and the single operation time of the centrifugal pump is 1 hour.
The design concept of the invention is that two cleaning modes which can be executed by user decision are designed to realize daily washing maintenance and deep cleaning after shutdown of the membrane separation equipment, and specifically the cleaning modes can be divided into a washing mode and a soaking mode, wherein the washing mode mainly executes a set daily washing process, and is changed into a chemical washing process which is alternately executed according to a set link after being washed by clear water for a certain number of times; the soaking mode is mainly characterized in that a chemical solvent is used for soaking for a long time during the period of equipment outage, and a centrifugal pump is used for chemical washing in a soaking gap.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a cleaning control method of a paper-making reconstituted tobacco leaching liquid membrane separation device provided by the embodiment of the invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The invention provides an embodiment of a cleaning control method for a paper-making reconstituted tobacco leaching liquid membrane separation device, which is shown in a combined figure 1 and can comprise the following steps:
and step S0, monitoring a cleaning mode instruction sent by a user in real time, wherein the cleaning mode instruction comprises a flushing mode instruction or a soaking mode instruction.
After receiving the flushing mode command (which may be in daily production generally), step S10 is executed to continuously detect the membrane tube clear liquid flow rate of the membrane separation device.
Step S11, when the flow rate of the membrane tube clear liquid is lower than a preset flow rate threshold value (such as 0.8-1.0 m)3When the temperature of the membrane tube is higher than the preset temperature, triggering the centrifugal pump to operate, pumping clean water (tap water can be used in practical operation) with a first temperature value (such as 40-50 ℃) through the centrifugal pump in a pressurizing mode, and sequentially performing corresponding forward clean water flushing and reverse clean water flushing on the membrane tube according to first set time and second set time respectively; the first set time is 3 minutes to 5 minutes, and the second set time is 4 minutes to 6 minutes.
And step S12, recording the times of the clear water washing as one time after the round of the forward clear water washing and the backward clear water washing is finished.
Step S13, when the number of times of rinsing with clear water reaches the preset number (such as 3 times), executing chemical rinsing; the chemical rinse includes: sequentially performing washing for the membrane tube A times, washing for the alkali B times, washing for the water C times, washing for the acid D times, washing for the water E times, and five forward flushing links (namely, reverse flushing can not be performed); the alkaline cleaning solution (NaOH solution with concentration of 5-8%) is prepared with alkaline cleaning solution with first concentration, the acid cleaning solution (sulfamic acid solution with concentration of 5-8%) is prepared with acidic cleaning solution with second concentration, and A, B, C, D, E are respectively determined for a predetermined number of times, preferably, a is 2, B is 1, C is 2, D is 1, E is 2, that is, washing with water is 2 times, alkaline cleaning is 1 time, washing with water is 2 times, acid cleaning is 1 time, and washing with water is 2 times. It should also be noted that in other embodiments, it is contemplated that the third setting time may be designed for the chemical flushing process, for example, the chemical flushing single-run time is 90 minutes to 110 minutes, and it is understood that the aforementioned setting of A, B, C, D, E and the setting of the third setting time are considered in combination.
Step S14, after the last washing step of chemical washing is completed, the inside and outside of the membrane tube are filled with clean water with a second temperature value (such as 20-25 ℃) for soaking protection, and before the membrane separation equipment works, a drain valve of the membrane separation equipment is triggered to open to discharge the clean water for soaking.
After receiving the soaking mode instruction (usually, when the product is switched or the production line is stopped), step S20 is executed to inject a pre-prepared soaking solvent (e.g., NaOH solution with a concentration of 8% -10%) into and out of the membrane tube, and perform the soaking process according to a preset soaking time (e.g., 20-24 hours).
And step S21, in the soaking treatment process, triggering the centrifugal pump to operate according to a preset operation period, pumping the soaking solvent through the centrifugal pump under pressure, and washing the membrane tube (for example, starting the centrifugal pump every 4 hours, and the single operation time of the centrifugal pump is 1 hour).
And step S22, after the soaking treatment is finished (and the soaking solvent is drained), washing the membrane tube with clean water, filling the membrane tube with clean water with a second temperature value (such as 20-25 ℃) for soaking protection after the clean water is washed, and triggering a drain valve of the membrane separation equipment to open to drain the clean water for soaking before the membrane separation equipment works.
On the basis of the above embodiments, the present invention further combines real scenario problems, for example, the temperature and pressure of the used cleaning solution may be changed due to various factors such as environment during the cleaning stage, and the equipment may be damaged. Thus, in some preferred embodiments, it is proposed to monitor in real time the temperature and/or pressure of the cleaning liquid used in the soaking mode (a temperature sensor and a pressure sensor may be provided in the line between the centrifugal pump and the inlet of the membrane separation device, detecting the temperature and pressure of the soaking solvent in the line), to trigger the opening of the blowdown valve of the membrane separation device when said temperature or said pressure exceeds a preset alarm limit (e.g. an upper temperature limit of 70 ℃ and an upper pressure limit of 0.28MPa), and to close said blowdown valve after a preset opening duration (e.g. 5 seconds) has been reached. The protection mechanism effectively ensures the safety of the membrane tube when a system fault or other abnormal emergency occurs in the cleaning process.
In summary, the design concept of the present invention is to design two cleaning modes that can be executed by a user's decision to implement daily washing maintenance and deep cleaning after shutdown of a membrane separation device, specifically, the cleaning modes can be divided into a washing mode and a soaking mode, wherein the washing mode mainly executes a predetermined daily washing process, and is changed into a chemical washing process alternately executed according to a predetermined link after a certain number of times of washing with clean water; the soaking mode is mainly characterized in that a chemical solvent is used for soaking for a long time during the period of equipment outage, and a centrifugal pump is used for chemical washing in a soaking gap.
In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, and all the modifications and equivalent embodiments that can be made according to the idea of the invention are within the scope of the invention as long as they are not beyond the spirit of the description and the drawings.
Claims (10)
1. A cleaning control method for a paper-making reconstituted tobacco leaching liquid membrane separation device is characterized by comprising the following steps:
monitoring a cleaning mode instruction sent by a user in real time, wherein the cleaning mode instruction comprises a flushing mode instruction or a soaking mode instruction;
continuously detecting the clear liquid flow of a membrane tube of the membrane separation equipment after receiving a flushing mode instruction;
when the clear water flow of the membrane tube is lower than a preset flow threshold value, triggering the centrifugal pump to operate, pumping clear water with a first temperature value through the centrifugal pump in a pressurizing mode, and sequentially performing corresponding forward clear water washing and reverse clear water washing on the membrane tube according to first set time and second set time;
recording the number of times of rinsing with clear water as one time after one round of rinsing with clear water in the forward direction and rinsing with clear water in the reverse direction are finished;
when the number of times of rinsing with clear water is accumulated to reach the preset number, executing chemical rinsing; the chemical rinse includes: sequentially performing washing, alkali washing, acid washing, washing and flushing for five forward directions on the membrane tube A times, B times, C times, D times and E times; wherein, the alkali cleaning adopts alkaline cleaning solution with a first concentration, the acid cleaning adopts acidic cleaning solution with a second concentration, and A, B, C, D, E is respectively set times;
after the last washing link of the chemical washing is finished, filling clean water with a second temperature value inside and outside the membrane tube for soaking protection, and triggering a drain valve of the membrane separation equipment to open to discharge the clean water for soaking before the membrane separation equipment works;
after receiving a soaking mode instruction, injecting a prefabricated soaking solvent into the interior and exterior of the membrane tube, and executing soaking treatment according to preset soaking duration;
in the soaking treatment process, triggering the centrifugal pump to operate according to a preset operation period, pumping a soaking solvent through the centrifugal pump under pressure, and washing the membrane tube;
and after the soaking treatment is finished, the membrane tube is washed by clean water, the inside and the outside of the membrane tube are filled with the clean water with the second temperature value for soaking protection after the clean water is washed, and a sewage valve of the membrane separation equipment is triggered to open to discharge the clean water for soaking before the membrane separation equipment works.
2. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation equipment according to claim 1, characterized by further comprising the following steps:
and in the soaking mode, monitoring the temperature and/or the pressure of the used cleaning liquid in real time, triggering a drain valve of the membrane separation equipment to open when the temperature or the pressure exceeds a preset warning limit value, and closing the drain valve after a preset opening duration is reached.
3. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation equipment according to claim 1, wherein A-2, B-1, C-2, D-1 and E-2.
4. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation equipment according to claim 1, wherein the first temperature value is 40-50 ℃, and the second temperature value is 20-25 ℃.
5. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation equipment according to claim 1, characterized in that the first set time is 3-5 minutes, and the second set time is 4-6 minutes.
6. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation equipment according to claim 1, wherein the prefabricated first-concentration alkaline cleaning solution is a NaOH solution with the concentration of 5% -8%.
7. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation device according to claim 1, wherein the pre-prepared acidic cleaning solution with the second concentration is an aminosulfonic acid solution with the concentration of 5% -8%.
8. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation equipment according to claim 1, wherein the prefabricated soaking solvent is a NaOH solution with the concentration of 8-10%.
9. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation equipment according to claim 1, wherein the soaking time is 20-24 hours.
10. The cleaning control method for the paper-making reconstituted tobacco leaching liquid membrane separation equipment according to claim 1, characterized in that the operation period is that the centrifugal pump is started every 4 hours, and the single operation time of the centrifugal pump is 1 hour.
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| US20100229899A1 (en) * | 2009-03-13 | 2010-09-16 | Andersen Torben M | Method and apparatus for cleaning processing equipment |
| CN102049198B (en) * | 2009-10-30 | 2013-06-05 | 中国石油化工股份有限公司 | Method for flushing reverse osmosis membrane |
| US8430112B2 (en) * | 2010-07-13 | 2013-04-30 | Siemens Industry, Inc. | Slurry feed system and method |
| CN102145257B (en) * | 2011-04-28 | 2013-02-27 | 上海交通大学 | Method for cleaning filtering membrane modules |
| CN102688694B (en) * | 2012-06-01 | 2014-07-23 | 河南方周瓷业有限公司 | On-line back washing process system of porous ceramic film |
| CN106268342A (en) * | 2016-08-30 | 2017-01-04 | 宜宾丝丽雅股份有限公司 | A kind of NF membrane cleaning method |
| CN206735866U (en) * | 2017-04-27 | 2017-12-12 | 武汉工程大学 | One kind automation silicon carbide ceramics film water purifier backwashing system |
| CN209205056U (en) * | 2018-11-02 | 2019-08-06 | 北京市环境保护科学研究院 | A kind of ceramic membrane online backflushing cleaning device |
| CN109224869A (en) * | 2018-11-19 | 2019-01-18 | 湖南军信环保股份有限公司 | A kind of cleaning method of NF film, RO film |
| CN110314548A (en) * | 2019-07-17 | 2019-10-11 | 安徽科博瑞环境科技有限公司 | Reconstituted tobacco extracts liquid film separation purification concentration systems and its treatment process |
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