CN114602878B - On-line cleaning system of evaporative crystallization device - Google Patents
On-line cleaning system of evaporative crystallization device Download PDFInfo
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- CN114602878B CN114602878B CN202210342976.1A CN202210342976A CN114602878B CN 114602878 B CN114602878 B CN 114602878B CN 202210342976 A CN202210342976 A CN 202210342976A CN 114602878 B CN114602878 B CN 114602878B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 221
- 238000002425 crystallisation Methods 0.000 title claims abstract description 101
- 230000008025 crystallization Effects 0.000 title claims abstract description 101
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- 239000007788 liquid Substances 0.000 claims abstract description 60
- 238000001704 evaporation Methods 0.000 claims abstract description 35
- 230000008020 evaporation Effects 0.000 claims abstract description 32
- 230000009471 action Effects 0.000 claims abstract description 7
- 239000012459 cleaning agent Substances 0.000 claims description 53
- 238000000034 method Methods 0.000 claims description 27
- 230000008569 process Effects 0.000 claims description 21
- 238000005406 washing Methods 0.000 claims description 19
- 238000001514 detection method Methods 0.000 claims description 17
- 239000006096 absorbing agent Substances 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 11
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- 230000005494 condensation Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 7
- 238000013461 design Methods 0.000 description 7
- 238000009434 installation Methods 0.000 description 6
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- 238000010586 diagram Methods 0.000 description 5
- 238000010926 purge Methods 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 150000003839 salts Chemical class 0.000 description 5
- XAEFZNCEHLXOMS-UHFFFAOYSA-M potassium benzoate Chemical compound [K+].[O-]C(=O)C1=CC=CC=C1 XAEFZNCEHLXOMS-UHFFFAOYSA-M 0.000 description 4
- 159000000000 sodium salts Chemical class 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000002378 acidificating effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 description 3
- 238000011086 high cleaning Methods 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
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- 241000607479 Yersinia pestis Species 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B1/00—Cleaning by methods involving the use of tools, brushes, or analogous members
-
- B08B1/12—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
-
- 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
-
- 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
-
- 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
- B08B9/087—Cleaning containers, e.g. tanks by methods involving the use of tools, e.g. brushes, scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2209/00—Details of machines or methods for cleaning hollow articles
- B08B2209/02—Details of apparatuses or methods for cleaning pipes or tubes
- B08B2209/027—Details of apparatuses or methods for cleaning pipes or tubes for cleaning the internal surfaces
Abstract
The application discloses evaporation crystallization device online cleaning system includes: the device comprises an evaporation crystallization unit, at least one cleaning unit, a heat exchange unit and a hot water unit; the heat exchange unit is used for preheating the liquid entering the hot water unit; the hot water unit comprises a hot water tank and a hot water pump, and the hot water pump is used for conveying liquid in the hot water tank to the evaporation crystallization unit and/or the cleaning unit; the cleaning unit comprises a cleaning tank and a circulating pump, wherein the circulating pump is used for conveying liquid in the cleaning tank to the evaporation and crystallization unit and/or the heat exchange unit, the liquid conveyed to the evaporation and crystallization unit is suitable for being conveyed back to the cleaning tank after cleaning, and the liquid conveyed to the heat exchange unit is suitable for entering the hot water tank and is conveyed back to the cleaning tank under the action of the hot water pump.
Description
Technical Field
The application relates to the technical field of evaporative crystallization, in particular to an online cleaning system of an evaporative crystallization device.
Background
The evaporative crystallization device is widely applied to industries such as chemical industry, food, light industry, pharmacy, environmental protection, energy, new materials and the like at present. The evaporation crystallization device frequently forms calcium magnesium scale and salt scale in the operation process, and needs to be stopped periodically and the evaporation device is manually cleaned, so that a series of cleaning problems such as high cleaning frequency, high cleaning difficulty, incomplete cleaning and the like always plagues the whole evaporation industry. The reasons for the generation of calcium-magnesium scale and salt scale by the evaporation crystallization device are mainly as follows:
first, because of the wide variety of material conditions, the material water contains Ca 2+ 、Mg 2+ Plasma cation and SO 4 2- 、CO 3 2- Plasma anions, calcium carbonate, calcium sulfate salt and the like formed by the anions can be supersaturated due to concentration and temperature changes to crystallize and separate out, scale solids are formed on a plate heat exchanger half-plate, in a circulating pipeline, in a heat exchanger heating pipe and on the inner wall of a crystallizer or a separator in an adhering manner, the heat exchange efficiency is affected if the scale solids are light, the plate fins and the heat exchange pipe are blocked if the scale solids are heavy, and the normal operation of an evaporation crystallization device is seriously affected. Wherein the solubility of calcium sulfate is not great and is in special condition of increasing and decreasing, such as solubility of 0.1928 g/(100 g H) at 10deg.C 2 O), the solubility at 100 ℃ is reduced to 0.1619 g/(100 g H) 2 O) when the temperature is more than or equal to 40 ℃, the solubility of the calcium sulfate is reduced along with the temperature rise, and the solubility change ensures that the concentration of the calcium sulfate is easier to be saturated when the material water in the heat exchange tube of the heater is heated in the cyclic evaporation process, and calcium scale is easier to be crystallized and separated out at the wall surface.
Secondly, when the operation control in the evaporation process is improper or the instrument fails during production, false liquid level and low liquid level phenomenon occur in the crystallizer or the separator, when heating steam (steam generating steam or MVR secondary steam) is still conveyed according to the steam supply amount during normal evaporation, the static liquid level pressure at the outlet of the heating pipe is extremely easy to be insufficient, the material subjected to heat exchange by the heat exchange pipe is boiled at the liquid level above the outlet of the heating pipe, and the material is boiled in the heating pipe due to the insufficient static liquid level pressure, so that salt crystallization precipitation is necessarily caused, and salt scale and calcium magnesium scale are formed by adhesion on the inner wall of the heating pipe.
At present, conventional equipment in the industry is required to be cleaned by a special cleaning device for cleaning a certain part or device independently, equipment is required to be stopped for cooling during cleaning, the stopping time is long, the cleaning equipment or device is required to be connected with corresponding pipelines, cleaning agents are prepared, the recovery work of the cleaning equipment or device before the whole cleaning process is prepared and after the cleaning process is finished is relatively complicated and time-consuming, cleaning liquid used in the cleaning process cannot be discharged outside independently after the cleaning process is finished, and independent treatment or discharge to a corresponding sewage treatment device is required. Some online cleaning equipment in the industry mainly adopts the structure of a cleaning ball or a cleaning brush, the structural design of the equipment is complicated, an independent ball chamber or a brush chamber is required to be arranged, the design, manufacturing, installation and debugging difficulties are increased, and in the whole cleaning process, the cleaning ball and the cleaning brush are most likely to be damaged to enter the subsequent pipeline, the valve and the equipment, so that the blockage of part of the valve, the pipeline and the equipment is caused, and the safety of the belt material operation of the device is influenced.
Disclosure of Invention
An object of the present application is to provide an online cleaning system for an evaporative crystallization apparatus, which can clean the evaporative crystallization apparatus online without stopping the apparatus.
Another object of the present application is to provide an online cleaning system for an evaporative crystallization apparatus, which is capable of cleaning a plurality of working units of the evaporative crystallization apparatus online respectively.
Another object of the present application is to provide an online cleaning system for an evaporative crystallization apparatus, which can reuse cleaning agents to clean different working units, thereby being beneficial to saving water.
Another object of the present application is to provide an online cleaning system for an evaporative crystallization apparatus, which has simple cleaning process and high cleaning efficiency.
In order to achieve the above object, the present application provides an online cleaning system for an evaporative crystallization device, comprising: the device comprises an evaporation crystallization unit, at least one cleaning unit, a heat exchange unit and a hot water unit; the heat exchange unit is used for preheating the liquid entering the hot water unit; the hot water unit comprises a hot water tank and a hot water pump, and the hot water pump is used for conveying liquid in the hot water tank to the evaporative crystallization unit and/or the cleaning unit; the washing unit comprises a washing tank and a circulating pump, wherein the circulating pump is used for conveying liquid in the washing tank to the evaporation and crystallization unit and/or the heat exchange unit, the liquid conveyed to the evaporation and crystallization unit is suitable for being conveyed back to the washing tank after washing, and the liquid conveyed to the heat exchange unit is suitable for entering the hot water tank and being conveyed back to the washing tank under the action of the hot water pump.
Further, the online cleaning system of the evaporative crystallization device comprises two sets of cleaning units, wherein the two cleaning units are used for circulating different cleaning agents.
Further, the cleaning unit has a quick interface for inputting cleaning agent, which is adapted to be connected with a cleaning agent canning vehicle delivery pipe or other cleaning agent discharge tank.
Further, at least one of the cleaning units further comprises a first absorber provided on the cleaning tank for absorbing acid mist or dust.
Further, the online cleaning system of the evaporative crystallization device further comprises a buffer unit, the buffer unit comprises a buffer tank, the buffer tank is suitable for being communicated with the cleaning tank so that liquid in the cleaning tank can be conveyed to the buffer tank through the circulating pump, the buffer tank is also suitable for being communicated with the evaporative crystallization unit, and therefore cleaning agent after cleaning the evaporative crystallization unit can flow back to the buffer tank.
Further, the buffer unit further comprises a second absorber arranged on the buffer tank, and the second absorber is used for absorbing acid mist or dust in the buffer tank.
Further, the heat exchange unit comprises a heat exchanger and a filter for filtering the liquid preheated by the heat exchanger, and the heat exchanger is connected with the hot water tank, so that the liquid preheated by the heat exchanger is suitable for entering the hot water tank.
Further, the heat exchange unit further comprises a condensation tank and a condensation pump, wherein the condensation tank is used for collecting condensed water, and the condensation pump is used for conveying the condensed water in the condensation tank to the hot water tank.
Further, the shell of the hot water tank is provided with a heat preservation coil pipe, the heat preservation coil pipe is provided with a steam inlet and a condensate water outlet, and the condensate water outlet is communicated with the condensing tank.
Further, a first temperature detection device is arranged at the liquid outlet of the heat exchanger, so that the amount of steam entering the heat exchanger is regulated according to the detection result of the first temperature detection device, and a first pressure detection device and a second pressure detection device are further arranged at the water inlet end and the water outlet end of the heat exchanger respectively, so that whether the heat exchanger needs to be cleaned is judged according to the detection results of the first pressure detection device and the second pressure detection device.
Compared with the prior art, the beneficial effect of this application lies in:
(1) Most cleaning devices in the prior art can only perform local cleaning on individual components or units, and the online cleaning system of the evaporative crystallization device can perform online cleaning on the complete set of evaporative crystallization devices;
(2) In the prior art, most of the cleaning devices cannot clean the water once again, and the original cleaning liquid is discharged and then the cleaning liquid is replaced again to clean other parts or units;
(3) Most cleaning devices in the prior art can clean the device or the part after the device or the part is stopped, so that production discontinuity is caused, the production efficiency and the whole process are greatly influenced, and the online cleaning system of the evaporation crystallization device can clean the device without stopping the device or the part;
(4) In the prior art, most cleaning devices need more cleaning preparation work before cleaning and are provided with a certain machine tool, the work such as recovery installation and leak detection is also needed after cleaning, the working procedure is complicated, the duration is long, and the related preparation and recovery work before and after cleaning of the online cleaning system of the evaporative crystallization device is less, so that the labor is saved, and the cleaning preparation and recovery time is reduced;
(5) Most cleaning devices in the prior art are required to be provided with unique cleaning equipment and corresponding exclusive cleaning devices aiming at different parts and positions, so that the universality is not high, and the flow equipment of the online cleaning system of the evaporation crystallization device is simple, and the universality is high;
(6) In the prior art, a part of cleaning devices need to be unique to clean small parts such as cleaning balls, cleaning brushes and the like, an independent ball chamber or a brush chamber needs to be designed, corresponding design, manufacturing, installation and operation costs are increased, and the equipment of the online cleaning system of the evaporation crystallization device mainly comprises tanks, pumps, heat exchangers and the like, so that the installation and maintenance are simple.
Drawings
FIG. 1 is a schematic diagram of one embodiment of an evaporative crystallization apparatus online cleaning system of the present application;
FIG. 2 is a schematic diagram of one embodiment of an evaporative crystallization unit of the present application;
FIG. 3 is a schematic view of one embodiment of a first cleaning unit of the present application;
FIG. 4 is a schematic view of one embodiment of a second cleaning unit of the present application;
FIG. 5 is a schematic diagram of one embodiment of a heat exchange unit of the present application;
FIG. 6 is a schematic diagram of one embodiment of a hot water unit of the present application;
FIG. 7 is a schematic diagram of one embodiment of a cache unit of the present application;
in the figure:
100. an evaporation crystallization unit; 101. evaporating sodium salt for 1 effect; 102. 2, evaporating sodium salt; 103. the potassium salt is evaporated 1 effect; 104. 2, evaporating potassium salt to 2 effect;
200 (A/B), a cleaning unit; 201 (A/B), a wash tank; 202 (A/B), a circulation pump; 203. a first absorber;
300. a heat exchange unit; 301. a heat exchanger; 302. a filter; 303. a condensing tank; 304. a condensing pump;
400. a hot water unit; 401. a hot water tank; 402. a hot water pump; 403. a heat preservation coil;
500. a cache unit; 501. a cache tank; 502. a buffer pump; 503. a second absorber.
Detailed Description
The present application will be further described with reference to the specific embodiments, and it should be noted that, on the premise of no conflict, new embodiments may be formed by any combination of the embodiments or technical features described below.
It should be noted that the terms "first," "second," and the like in the description and in the claims of the present application are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.
The terms "comprises" and "comprising," along with any variations thereof, in the description and claims of the present application are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1-7, the present application provides an online cleaning system for an evaporative crystallization apparatus, which includes an evaporative crystallization unit 100, at least one cleaning unit 200, a heat exchange unit 300, and a hot water unit 400.
The heat exchange unit 300 is used for preheating the liquid entering the hot water unit 400; the hot water unit 400 includes a hot water tank 401 and a hot water pump 402, the hot water pump 402 being used to deliver the liquid in the hot water tank 401 to the evaporative crystallization unit 100 and/or the washing unit 200; the cleaning unit 200 comprises a cleaning tank 201 and a circulating pump 202, wherein the circulating pump 202 is used for conveying liquid in the cleaning tank 201 to the evaporative crystallization unit 100 and/or the heat exchange unit 300, the liquid conveyed to the evaporative crystallization unit 100 is suitable for being conveyed back to the cleaning tank 201 after being cleaned, and the liquid conveyed to the heat exchange unit 300 is suitable for entering a hot water tank 401 and being conveyed back to the cleaning tank 201 under the action of the hot water pump 402.
The cleaning unit 200 of the present application can clean the evaporative crystallization unit 100 alone, and at this time, the cleaning agent in the cleaning tank 201 is conveyed to the evaporative crystallization unit 100 by the circulation pump 202, and after cleaning the evaporative crystallization unit 100, the cleaning agent flows back into the cleaning tank 201, and the cleaning agent can be circulated between the evaporative crystallization unit 100 and the cleaning tank 201 continuously by the circulation pump 202. The cleaning agent can be circularly cleaned for multiple times in the whole cleaning process, which is beneficial to saving the consumption of the cleaning agent.
The cleaning unit 200 of this application can also wash heat exchange unit 300 and hot water unit 400 alone, at this moment, carry the heat exchange unit 300 with the cleaner in the cleaning tank 201 through circulating pump 202, get into hot water tank 401 after the cleaning agent washs heat exchange unit 300, then utilize hot water pump 402 to carry back the cleaning tank 201 with the cleaner in the hot water tank 401, utilize circulating pump 202 and hot water pump 402 can make the cleaner constantly circulate between heat exchange unit 300, hot water tank 401 and cleaning tank 201, when reducing the cleaner quantity, improved the cleaning effect.
The cleaning unit 200 of the present application may further simultaneously clean the evaporative crystallization unit 100, the heat exchange unit 300 and the hot water unit 400, at this time, the cleaning agent is simultaneously conveyed to the evaporative crystallization unit 100 and the heat exchange unit 300 by using the circulation pump 202, the cleaning agent after cleaning the evaporative crystallization unit 100 flows back to the cleaning tank 201, and the cleaning agent conveyed to the heat exchange unit 300 enters the hot water tank 401 and is conveyed back to the cleaning tank 201 again by the hot water pump 402.
The washing unit 200 of the present application may further wash the evaporative crystallization unit 100, the heat exchange unit 300, and the hot water unit 400 in an appropriate order. For example, the cleaning agent in the cleaning tank 201 may be first transferred to the heat exchange unit 300, then the cleaning agent enters the hot water tank 401, then the cleaning agent is transferred to the evaporative crystallization unit 100 by the hot water pump 401, and the cleaning agent flows back to the cleaning tank 201 after cleaning the evaporative crystallization unit 100.
The water heating unit 400 can be used for washing the evaporative crystallization unit 100, namely, water is input into the heat exchange unit 300, the water is heated by the water heating unit 400 and then is conveyed to the evaporative crystallization unit 100 by the water heating pump, and the washing liquid after washing can be conveyed to the washing tank 201 and then discharged, and can be conveyed to other tanks (such as a cache tank) and then discharged.
It should be noted that, when cleaning is not needed, the circulation pump 202 of the cleaning unit 200 is turned off, and the evaporative crystallization unit 100, the heat exchange unit 300, and the hot water unit 400 can perform the evaporative crystallization normally.
The online cleaning system of the evaporative crystallization device can clean the evaporative crystallization unit 100 without stopping, and can save the system on-off time.
The online cleaning system of the evaporation crystallization device can automatically control the opening and closing of various pumps and valves in the cleaning system by software, so that the whole-course automatic cleaning can be realized, the online monitoring and online fault self-diagnosis functions can be carried out on the cleaning process, the operation is simple, and professional cleaning personnel are not required to be equipped.
In a preferred embodiment, the on-line cleaning system of the evaporative crystallization apparatus includes two sets of cleaning units 200, with two sets of cleaning units 200 for circulating different cleaning agents, e.g., one set of cleaning units 200 for circulating an acidic cleaning agent and the other set of cleaning units 200 for circulating an alkaline cleaning agent.
The application can select proper cleaning liquid according to the operation systems of different materials. The cleaning fluid may be, but is not limited to: 1 to 3 percent of hydrochloric acid, 2 to 5 percent of sodium hydroxide, 3 to 5 percent of sodium carbonate and ethylenediamine tetraacetic acid (4 to 6 percent of EDTA).
Specifically, as shown in fig. 3, the first cleaning unit 200A includes a first cleaning tank 201A and a first circulation pump 202A, the first cleaning agent enters the first cleaning tank 201A through a G14 inlet or is directly conveyed to a G7 channel of the evaporative crystallization unit 100 by the first circulation pump 202A, the first cleaning agent flows back to the first cleaning tank 201A through a G9 channel after cleaning the evaporative crystallization unit 100, and the first cleaning agent in the first cleaning tank 201A is continuously conveyed to the G7 channel of the evaporative crystallization unit 100 under the action of the first circulation pump 202A. The first cleaning agent in the first cleaning tank 201A may be further conveyed to the heat exchange unit 300 by the first circulation pump 202A through the G4 channel, to clean the heat exchange unit 300 and the hot water unit 400, and the cleaned first cleaning agent may be conveyed back to the first cleaning tank 201A by the hot water pump 402.
As shown in fig. 4, the second cleaning unit 200B includes a second cleaning tank 201B and a second circulation pump 202B, the second cleaning agent enters the second cleaning tank 201B through a G15 inlet or is directly conveyed to a G8 channel of the evaporative crystallization unit 100 by the second circulation pump 202B, the second cleaning agent flows back to the second cleaning tank 201B through a G10 channel after cleaning the evaporative crystallization unit 100, and the second cleaning agent in the second cleaning tank 201B is continuously conveyed to the G8 channel of the evaporative crystallization unit 100 under the action of the second circulation pump 202B. The second cleaning agent in the second cleaning tank 201B may be further conveyed to the heat exchange unit 300 by the second circulation pump 202B through the G4 channel, to clean the heat exchange unit 300 and the hot water unit 400, and the cleaned second cleaning agent may be conveyed back to the second cleaning tank 201B by the hot water pump 402.
In some embodiments, the first cleaning unit 200A is configured to store and circulate an acidic cleaning solution, and the first cleaning unit 200A further includes a first absorber 203 disposed on the first cleaning tank 201A, the first absorber 203 being adapted to absorb a portion of the acid mist or dust in the first cleaning tank 201A when the first circulation pump 202A is operated, as shown in fig. 3.
In some embodiments, the G14 and/or G15 inlet is a fast interface that can be respectively plugged into a mobile cleaner canning delivery pipe or into a dosing purge bucket of a dosing device area in a municipal mineral recycling disposal system, thereby improving versatility.
In some embodiments, the online cleaning system of the evaporative crystallization apparatus includes a buffer unit 500, as shown in fig. 7, the buffer unit 500 includes a buffer tank 501 and a buffer pump 502; the buffer tank 501 is adapted to communicate with the wash tank 201 so that liquid in the wash tank 201 is delivered to the buffer tank 501 by the circulation pump 202; the buffer tank 501 is also adapted to communicate with the evaporative crystallization unit 100, so that the cleaning agent directly flows back to the buffer tank 501 after cleaning the evaporative crystallization unit 100; the buffer pump 502 is suitable for conveying the liquid in the buffer tank 501 to a water washing device of the urban mineral resource utilization treatment system for recycling water resources; after the PH value of the liquid in the buffer tank 501 is adjusted according to the water quality in the buffer tank 501, the liquid is conveyed to the evaporation crystallization unit by the buffer pump 502 for treatment, so that the utilization of water resources is improved, and the discharge is reduced.
In one embodiment, as shown in fig. 1 and 7, the buffer tank 501 communicates with the first purge tank 201A via a G11 channel, and the liquid in the first purge tank 201A is adapted to enter the buffer tank 501 via the G11 channel by the first circulation pump 202A. The buffer tank 501 communicates with the second purge tank 201B via a G12 channel, and the liquid in the second purge tank 201B is adapted to pass into the buffer tank 501 via G12 by the second circulation pump 202B. The buffer tank 501 is also in selective communication with the G9 channel and the G10 channel, so that the liquid in the evaporative crystallization unit 100 can be delivered from either the G9 channel or the G10 channel to the buffer tank 501.
In addition, the liquid in the hot water tank 401 may be also transferred to the buffer tank 501 by the hot water pump 402. Specifically, the liquid in the hot water tank 401 may be delivered to the G6 channel by the hot water pump 402, and the liquid in the G6 channel may be delivered to the evaporative crystallization unit 100 or may be delivered to the buffer tank 501 by adjusting the corresponding valve.
In some embodiments, the buffer unit 500 further includes a second absorber 503 disposed on the buffer tank 501, the second absorber 503 being configured to absorb a portion of the acid mist or dust in the buffer tank 501.
In some embodiments, automatic drain valves may be provided at the bottoms of the hot water tank 401, the cleaning tank 201, and the buffer tank 501, so that the liquid in the tanks may be drained to the water washing device of the municipal mineral resource utilization treatment system to recycle water resources.
In one embodiment, the liquid in the hot water tank 401 may be directly discharged through the G16 channel, the liquid in the first cleaning tank 201A may be directly discharged through the G18 channel, the liquid in the second cleaning tank 201B may be directly discharged through the G19 channel, and the liquid in the buffer tank 501 may be directly discharged through the G20 channel.
In some embodiments, the heat exchange unit 300 includes a heat exchanger 301 and a filter 302, the filter 302 for filtering the liquid entering the heat exchanger 301 to remove solid impurity particles in the liquid. The water outlet of the heat exchanger 301 is communicated with the hot water tank 401, so that the liquid preheated by the heat exchanger 301 enters the hot water tank 401 for heating.
It is worth mentioning that the heat exchanger 301 may be, but is not limited to, a plate heat exchanger, a shell-and-tube heat exchanger, a hot air heat exchanger, a waste heat recovery device, a heat pump, etc. The filter 302 may be, but is not limited to, a vertical filter, a tube filter, a ceramic membrane filter, a membrane filtration device, a pure water producing device, etc.
In some embodiments, the heat exchange unit 300 further includes a condensation tank 303 and a condensation pump 304, wherein the condensation takes place after the steam subjected to heat exchange passes through the heat exchanger 301, the condensation tank 303 is used for collecting condensed water, and the condensation pump 304 is used for delivering the condensed water to the hot water tank 401. Thus, the steam utilization rate is improved, and the water consumption is saved. Of course, the condensation tank 303 and the condensation pump 304 may be directly replaced by pipes, and the condensed water may be directly introduced into the hot water tank 401 through the pipes.
In one embodiment, as shown in fig. 5, in one aspect, a liquid (which may be water, deionized water, or a cleaning agent) enters the filter 302 through the G4 channel, then enters the heat exchanger 301, and enters the hot water tank 401 through the G5 channel after heat exchange by the heat exchanger 301; on the other hand, raw steam enters the heat exchanger 301 through the G2 channel, enters the G3 channel after heat exchange, condensed water is collected in the condensation tank 303, and the condensation pump 304 can convey liquid in the condensation tank 303 to the hot water tank 401.
Further, the liquid in the filter 302 may be directly discharged through the G22 channel, and the liquid in the condensation tank 303 may be directly discharged through the G21 channel.
Further, the water temperature of G5 may be detected by the first temperature detecting means (TT-02), and the valve of the G2 channel may be adjusted according to the data of the first temperature detecting means to adjust the amount of steam passing through the heat exchanger 301, thereby controlling the water temperature of the G5 channel. The steam intake of G2 can be counted by FT-02.
Further, a first pressure detecting device (PT-02) and a second pressure detecting device (PT-03) are respectively disposed at the water inlet end and the water outlet end of the heat exchanger 301, the heat exchange unit 300 further has a cleaning alarm device, the cleaning alarm device is electrically connected with the first pressure detecting device and the second pressure detecting device, and by comparing the pressure data of the first pressure detecting device and the second pressure detecting device, it can be determined whether the heat exchanger 301 is blocked seriously and needs cleaning, and when the cleaning is needed, the cleaning alarm device automatically alarms.
In some embodiments, the hot water unit 400 further includes a thermal coil 403 disposed outside the hot water tank 401, the thermal coil 403 being used to ensure that the liquid within the hot water tank 401 is stably maintained at a desired process temperature. The heat preservation coil 403 has steam inlet and comdenstion water export, comdenstion water export and condenser tank 303 intercommunication, so, is favorable to improving steam utilization, practices thrift the water consumption.
In one embodiment, as shown in FIG. 6, the raw steam is adapted to pass through the G1 channel to the insulation coil 403, and the condensate within the insulation coil 403 is adapted to be delivered to the condensate tank 303 through the G17 channel.
The hot water tank 401 of the present application may be manufactured using a tank body with a built-in coil or a jacket.
In some embodiments, as shown in fig. 2, evaporative crystallization unit 100 includes sodium salt evaporation 1 effect 101, sodium salt evaporation 2 effect 102, potassium salt evaporation 1 effect 103, potassium salt evaporation 2 effect 104. The working principle of each effect of the evaporative crystallization unit 100 is the prior art, and will not be described in detail in this application.
It is worth mentioning that opening of each equipment in this application all can realize automatic control through the procedure, and during the washing, only need set for the cleaning time, can accomplish whole cleaning work through the procedure.
In the present application, the cleaning tank 201 and the buffer tank 501 may be made of different materials, for example, carbon steel or stainless steel (such as 304 or 316L) is used as the outer shell, and non-metallic materials (such as PE, PTFE, glass fiber reinforced plastic, resin, PEEK, HDPE, PPS) are used as the inner liner
It is worth mentioning that the general cleaning process is alkali cleaning, acid cleaning, hot water cleaning for 1-2 times and hot water temperature of 80-95 deg. When the cleaning is actually performed, an alkaline cleaning agent is arranged in the second cleaning tank 201B, the second circulating pump 202B of the second cleaning unit 200B is controlled to start working first, the target is subjected to alkaline cleaning, the cleaning can be circularly performed for a plurality of times according to actual needs, and the cleaning agent can be returned to the cleaning tank 201B or the buffer tank 501 after the alkaline cleaning is completed; the first cleaning tank 201A is internally provided with an acidic cleaning agent, the first circulating pump 202A of the first cleaning unit 200A is controlled to start working, the target is pickled, the target can be circularly cleaned for a plurality of times according to actual needs, and the cleaning agent can be returned to the cleaning tank 201A or the buffer tank 501 after the pickling is finished; after the cleaning is completed, water or deionized water is introduced into the heat exchange unit 300, and the hot water unit 400 is controlled to start working, the water is heated by the hot water unit 400 and then is input into the evaporative crystallization unit 100 for hot water cleaning, and the cleaning solution can be conveyed to the buffer tank 501. The whole cleaning process can be controlled by a program, personnel is not required to be on duty, and the operation is simple.
In the prior art, the online cleaning equipment mainly adopts a cleaning ball or cleaning brush structure, the structural design of the equipment is complicated, an independent ball chamber or a brush chamber is required to be equipped, the design, manufacturing, installation and debugging difficulties are increased, in the whole cleaning process, the cleaning ball and the cleaning brush are most likely to be damaged to enter the subsequent pipeline, the valve and the equipment, so that the blockage of part of the valve, the pipeline and the equipment is caused, and the stable operation of the cleaned system after restarting is influenced. The equipment of the online cleaning system of the evaporation crystallization device is mainly equipment such as tanks, pumps, heat exchangers and the like, the installation and the maintenance of the equipment are simple, the maintenance cost and the operation cost are reduced, in addition, the equipment is free of corresponding small parts such as balls or brushes, the prepared corresponding solution is also a dilute solution, the equipment such as pipelines, filters, valves and heat exchangers of the evaporation crystallization device cannot be blocked, the pump impeller cannot be damaged, and the stability of the evaporation device after being started is improved.
The online cleaning system of the evaporative crystallization device can realize full-process automatic cleaning, can clean dirt and salt dirt thoroughly, has a cleaning effect of more than 95%, and can effectively improve the operation safety and stability of the evaporative crystallization device after cleaning.
The on-line cleaning system of the evaporative crystallization device can be used for configuring hot water with different temperatures to locally clean different parts or components, the cleaning process is controllable, and the cleaning coverage is wider.
According to the evaporation crystallization device online cleaning system, different types of cleaning liquid can be accessed from the G4 port for online cleaning according to the actual running state and the arrangement condition of field devices, and the operation is flexible.
The on-line cleaning system of the evaporation crystallization device can be systematically designed according to actual conditions, the skid-mounted structural design can be carried out on smaller cleaning amount, the design is relatively compact, and subsequent process equipment can be flexibly arranged and connected.
The on-line cleaning system of the evaporative crystallization device can be used for configuring corresponding water consumption according to the actual capacity of the evaporative crystallization unit, the whole water resource can be recycled, and the utilization rate of the water resource is improved.
The foregoing has outlined the basic principles, main features and advantages of the present application. It will be appreciated by persons skilled in the art that the present application is not limited to the embodiments described above, and that the embodiments and descriptions described herein are merely illustrative of the principles of the present application, and that various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of protection of the present application is defined by the appended claims and equivalents thereof.
Claims (6)
1. An on-line cleaning system for an evaporative crystallization apparatus, comprising: the device comprises an evaporation crystallization unit, a first cleaning unit, a second cleaning unit, a heat exchange unit and a hot water unit;
the hot water unit comprises a hot water tank and a hot water pump, water can be conveyed to the evaporative crystallization unit by the hot water pump after being heated by the hot water tank, and washing liquid after washing is suitable for being conveyed to the first washing unit or the second washing unit or other tank bodies;
the heat exchange unit comprises a heat exchanger, a filter, a condensing tank and a condensing pump, wherein the filter is used for filtering liquid entering the heat exchanger so as to remove solid impurity particles in the liquid, a water outlet of the heat exchanger is communicated with the hot water tank, so that the liquid preheated by the heat exchanger enters the hot water tank for heating, steam for heat exchange is condensed after passing through the heat exchanger, the condensing tank is used for collecting condensed water, the condensing pump is used for conveying the condensed water to the hot water tank,
the first cleaning unit comprises a first cleaning tank and a first circulating pump, wherein a first cleaning agent is suitable for entering the first cleaning tank or is directly conveyed to a G7 channel of the evaporative crystallization unit by the first circulating pump, the first cleaning agent flows back to the first cleaning tank through a G9 channel after cleaning the evaporative crystallization unit, the first cleaning agent in the first cleaning tank is continuously conveyed to the G7 channel of the evaporative crystallization unit under the action of the first circulating pump, the first cleaning agent in the first cleaning tank can also be conveyed to the heat exchange unit by the first circulating pump through the G4 channel, the heat exchange unit and the hot water unit are cleaned, and the cleaned first cleaning agent can be conveyed back to the first cleaning tank by the hot water pump;
the second cleaning unit comprises a second cleaning tank and a second circulating pump, a second cleaning agent is suitable for entering the second cleaning tank or is directly conveyed to a G8 channel of the evaporative crystallization unit by the second circulating pump, the second cleaning agent flows back to the second cleaning tank through a G10 channel after cleaning the evaporative crystallization unit, the second cleaning agent in the second cleaning tank is continuously conveyed to the G8 channel of the evaporative crystallization unit under the action of the second circulating pump, the second cleaning agent in the second cleaning tank can also be conveyed to the heat exchange unit by the second circulating pump through the G4 channel, the heat exchange unit and the hot water unit are cleaned, and the cleaned second cleaning agent can be conveyed back to the second cleaning tank by the hot water pump;
the hot water unit further comprises a heat preservation coil pipe arranged outside the hot water tank, the heat preservation coil pipe is used for ensuring that liquid in the hot water tank is stably maintained at a required process temperature, the heat preservation coil pipe is provided with a steam inlet and a condensate water outlet, and the condensate water outlet is communicated with the condensing tank of the heat exchange unit.
2. The evaporative crystallization apparatus online cleaning system of claim 1, wherein the first cleaning unit and the second cleaning unit each have a quick interface for inputting a cleaning agent adapted to connect with a cleaning agent tank truck delivery pipe or other cleaning agent discharge tank.
3. The evaporative crystallization apparatus online cleaning system of claim 1, wherein the first cleaning unit further comprises a first absorber disposed on the cleaning tank for absorbing acid mist or dust.
4. The online cleaning system of an evaporative crystallization apparatus according to claim 1, further comprising a buffer unit, wherein the buffer unit comprises a buffer tank, the buffer tank is adapted to be communicated with the first cleaning tank and the second cleaning tank, so that the liquid in the first cleaning tank and the second cleaning tank can be respectively conveyed to the buffer tank by the first circulating pump and the second circulating pump, and the buffer tank is further adapted to be communicated with the evaporative crystallization unit, so that the cleaning agent cleaned by the evaporative crystallization unit can flow back to the buffer tank.
5. The online cleaning system of an evaporative crystallization apparatus according to claim 4, wherein the buffer unit further comprises a second absorber disposed on the buffer tank, the second absorber being configured to absorb acid mist or dust in the buffer tank.
6. The online cleaning system of an evaporative crystallization device according to claim 1, wherein a liquid outlet of the heat exchanger is provided with a first temperature detection device, so that the amount of steam entering the heat exchanger is regulated according to the detection result of the first temperature detection device, and a water inlet end and a water outlet end of the heat exchanger are respectively provided with a first pressure detection device and a second pressure detection device, so that whether the heat exchanger needs to be cleaned is judged according to the detection results of the first pressure detection device and the second pressure detection device.
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