CN113695279B - Medium-pressure ultraviolet sterilization system capable of automatically cleaning on line and operation process - Google Patents
Medium-pressure ultraviolet sterilization system capable of automatically cleaning on line and operation process Download PDFInfo
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- CN113695279B CN113695279B CN202111029810.6A CN202111029810A CN113695279B CN 113695279 B CN113695279 B CN 113695279B CN 202111029810 A CN202111029810 A CN 202111029810A CN 113695279 B CN113695279 B CN 113695279B
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- 238000004140 cleaning Methods 0.000 title claims abstract description 195
- 230000001954 sterilising effect Effects 0.000 title claims abstract description 87
- 238000004659 sterilization and disinfection Methods 0.000 title claims abstract description 81
- 238000000034 method Methods 0.000 title claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 71
- 238000004506 ultrasonic cleaning Methods 0.000 claims abstract description 45
- 239000000126 substance Substances 0.000 claims abstract description 30
- 238000002834 transmittance Methods 0.000 claims description 31
- 239000012459 cleaning agent Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 4
- 238000007790 scraping Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 239000010865 sewage Substances 0.000 claims description 2
- 239000003344 environmental pollutant Substances 0.000 abstract description 11
- 231100000719 pollutant Toxicity 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 4
- 239000002351 wastewater Substances 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 3
- 238000005406 washing Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 9
- 238000001223 reverse osmosis Methods 0.000 description 6
- 244000005700 microbiome Species 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000000813 microbial effect Effects 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000001464 adherent effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000006056 electrooxidation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003631 expected effect Effects 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000028327 secretion Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
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- 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
- B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
- B08B1/14—Wipes; Absorbent members, e.g. swabs or sponges
- B08B1/143—Wipes
-
- 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
- B08B1/30—Cleaning by methods involving the use of tools by movement of cleaning members over a surface
-
- 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
- B08B1/30—Cleaning by methods involving the use of tools by movement of cleaning members over a surface
- B08B1/32—Cleaning by methods involving the use of tools by movement of cleaning members over a surface using rotary cleaning members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- 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
- 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
- B08B3/12—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 by sonic or ultrasonic vibrations
-
- 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
- B08B9/023—Cleaning the external surface
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
- C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Toxicology (AREA)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Physical Water Treatments (AREA)
Abstract
The application relates to an automatic online cleaning medium-pressure ultraviolet sterilization system, which comprises: medium pressure ultraviolet sterilizing device, mechanical cleaning device, ultrasonic cleaning device and chemical cleaning system; wherein the chemical cleaning system comprises a cleaning water tank and a cleaning pump; an inlet valve is arranged on the water inlet pipeline, and the water inlet pipeline behind the inlet valve is respectively connected into the medium-pressure ultraviolet sterilization device and the water washing tank in two ways. The beneficial effects of the application are as follows: the medium-voltage ultraviolet sterilization device can be used for monitoring the attached pollutants of the ultraviolet lamp, optimizing the operation condition, reducing the labor cost and improving the sterilization efficiency. And the mechanical cleaning device and the ultrasonic cleaning device are arranged, so that the adhesion of pollutants of different types and different degrees can be effectively removed, and the device is suitable for the sterilization treatment of high-hardness high-pollution wastewater. The application has simple operation and maintenance and small occupied area, can be used for complete production of a new system, and can also be updated and reformed with low cost on the basis of an old system.
Description
Technical Field
The application belongs to the technical field of environmental protection water treatment, and particularly relates to an automatic online cleaning medium-pressure ultraviolet sterilization system and an operation process.
Background
Ultraviolet rays with the wavelength of 100-400 nm have a sterilization function, and the ultraviolet sterilization technology developed based on the principle is applied to a water works in Fabry-Perot as early as 1910. The medium-pressure ultraviolet sterilization technology utilizes a medium-pressure mercury lamp to emit ultraviolet light with the full wave band of 200-400 nm to destroy the DNA structure of microorganisms, and can permanently kill the microorganisms without reactivating reaction, thereby preventing the rapid proliferation of the microorganisms. The medium-pressure ultraviolet sterilization device has the advantages of strong ultraviolet penetrability, wide spectrum range, high sterilization capability, small occupied area and the like, and is widely used for the sterilization and disinfection treatment of large-scale industrial water.
In the running process of the medium-pressure ultraviolet sterilization device, the ultraviolet light irradiated into the solution is weakened due to the adhesion effect of suspended matters in the incoming water and the scaling effect of calcium and magnesium ions, so that the sterilization and disinfection effects are affected. Existing devices typically provide mechanical, ultrasonic, or chemical cleaning means to keep the outside of the uv lamp sleeve clean. The mechanical cleaning means that the cleaning head is utilized to scrape and remove attachments on the outer wall of the ultraviolet lamp sleeve, and the cleaning device has the advantages of low equipment cost, low running cost and simple operation, is suitable for adhering type pollutants, and has poor cleaning effect on firm pollutants such as chemical scaling and the like. Ultrasonic cleaning refers to the process of utilizing an ultrasonic device to emit ultrasonic waves, and removing pollutants through the actions of mixing, cracking, condensing, oxidizing and the like, and the method is suitable for cleaning firmer pollutants, but still cannot ensure that an ultraviolet lamp tube is completely cleaned. Chemical cleaning means that pollutants on the outer wall of an ultraviolet lamp tube are thoroughly removed by using an acid solution or other cleaning agents through a cyclic soaking cleaning method, and the cleaning method has the best effect but has a plurality of defects: during chemical cleaning, equipment must be shut down, and a large amount of cleaning agent is used to generate a certain amount of cleaning wastewater. The three cleaning methods have advantages and disadvantages and are suitable for cleaning the ultraviolet lamp sleeve under different actual pollution conditions. The existing complete set of medium-pressure ultraviolet sterilization devices are generally only provided with 1-2 cleaning modes, and can only execute certain cleaning through manual judgment, so that convenience and universality are not available in practical industrial application.
Therefore, aiming at the problem of scaling of polar plates in the existing electrochemical oxidation system, it is necessary to develop a medium-pressure ultraviolet sterilization system capable of automatically cleaning on line.
Disclosure of Invention
The application aims to overcome the defects in the prior art and provides an automatic online cleaning medium-pressure ultraviolet sterilization system and an operation process.
The medium-pressure ultraviolet sterilization system for automatic online cleaning comprises: medium pressure ultraviolet sterilizing device, mechanical cleaning device, ultrasonic cleaning device and chemical cleaning system; wherein the chemical cleaning system comprises a cleaning water tank and a cleaning pump; an inlet valve is arranged on the water inlet pipeline, and the water inlet pipeline behind the inlet valve is respectively connected into the medium-pressure ultraviolet sterilization device and the water washing tank in two ways; a cleaning valve B is arranged on a branch of a water inlet pipeline connected with the cleaning water tank, the cleaning water tank is connected with a cleaning agent water inlet pipeline, a water outlet and a cleaning liquid drain outlet are arranged on the cleaning water tank, the cleaning liquid drain outlet on the cleaning water tank is connected with a cleaning liquid drain pipeline, and a drain valve is arranged on the cleaning liquid drain pipeline; the water outlet of the cleaning water tank is connected with one end of a cleaning pump through a pipeline, the other end of the cleaning pump is connected with a water outlet pipeline of the medium-pressure ultraviolet sterilization device, and a cleaning valve A is arranged on a connecting pipeline between the cleaning pump and the water outlet pipeline of the medium-pressure ultraviolet sterilization device; an outlet valve is arranged on a pipeline of the cleaning pump behind an access point on a water outlet pipeline of the medium-pressure ultraviolet sterilization device; a medium-pressure ultraviolet lamp tube, a flowmeter, an ultraviolet light transmittance sensor, a temperature sensor, an ultraviolet intensity sensor, a mechanical cleaning device and an ultrasonic cleaning device are arranged in the medium-pressure ultraviolet sterilization device; each medium-voltage ultraviolet lamp tube is provided with a set of mechanical cleaning device and a set of ultrasonic cleaning device; the medium-voltage ultraviolet lamp tube is embedded into the protective shell of the medium-voltage ultraviolet sterilizing device and is perpendicular to the direction of the main tube of the medium-voltage ultraviolet sterilizing device; the mechanical cleaning device is arranged on the outer wall of the medium-pressure ultraviolet lamp tube, is non-fixedly sleeved on the medium-pressure ultraviolet lamp tube and can reciprocally rotate to scrub the medium-pressure ultraviolet lamp tube; the ultrasonic cleaning device is fixedly connected to the inner wall of the main pipe of the medium-pressure ultraviolet sterilization device beside the medium-pressure ultraviolet lamp tube, and the distance between the ultrasonic cleaning device and the medium-pressure ultraviolet lamp tube is smaller than a set value; the outlet valve, the cleaning valve A, the cleaning valve B, the inlet valve and the blow-down valve are all electrically connected with the control device.
Preferably, the distance between the ultrasonic cleaning device and the medium-pressure ultraviolet lamp tube is less than 10cm.
Preferably, the outlet valve, the cleaning valve A, the cleaning valve B, the inlet valve and the drain valve are all electric valves.
Preferably, the mechanical cleaning device is provided with a scraping sealing ring and other accessories.
The operation method of the medium-pressure ultraviolet sterilization system for automatic online cleaning comprises the following steps:
step 1, after a medium-voltage ultraviolet sterilization device stably runs for a set time, automatically recording initial light transmittance A0 by a control program built in a control device; during the continuous operation of the medium-pressure ultraviolet sterilization device, when the real-time light transmittance A1 monitored by the ultraviolet light transmittance sensor is smaller than the initial light transmittance A0-set warning value W, the mechanical cleaning device executes mechanical cleaning, and the control program records the real-time light transmittance A2 within a set time period after the cleaning is finished;
step 2, if the real-time light transmittance A2 recorded in the step 1 meets the condition that A2 is more than or equal to A0-W, the mechanical cleaning is effective, and the step 1 is continuously repeated; if A2 is less than A0-W, indicating that the mechanical cleaning effect does not reach the standard, controlling the ultrasonic cleaning device to execute ultrasonic cleaning by the control program, and automatically recording the real-time light transmittance A3 in a set time period after the ultrasonic cleaning is finished;
step 3, if the real-time light transmittance A3 recorded in the step 2 meets the condition that A3 is more than or equal to A0-W, the ultrasonic cleaning is effective, and the step 1 is continuously and repeatedly executed; if A3 is less than A0-W, indicating that the ultrasonic cleaning effect does not reach the standard, sending an alarm by the control program to prompt that chemical cleaning is to be performed;
and step 4, stopping water inlet and outlet of the medium-pressure ultraviolet sterilization device, and controlling a program to control the chemical cleaning step after the chemical cleaning is confirmed to be executed manually.
Preferably, the mechanical cleaning device in step 1 performs mechanical cleaning: the scraping sealing ring is moved from one end of the ultraviolet lamp tube to the other end in the single mechanical cleaning process, and then is returned from the other end to the initial position for about 3 minutes.
Preferably, the control device in the step 1 is provided with a chain protection and automatic alarm program.
Preferably, the set time length for the stable operation of the medium-pressure ultraviolet sterilization device in the step 1 is 2 hours; the warning value W was set to 5%, and the set time period after the end of the cleaning was 15 minutes.
Preferably, the ultrasonic cleaning frequency of the ultrasonic cleaning device in the step 2 is 50 to 200khz, and the duration of single cleaning of the ultrasonic cleaning device is set to a set value (for example, 1 minute, 5 minutes or 10 minutes); the set time period after the end of ultrasonic cleaning was 15 minutes.
Preferably, the chemical cleaning step in the step 4 specifically comprises:
step 4.1, closing an inlet valve and an outlet valve; a cleaning agent (such as 1% hydrochloric acid solution) enters the cleaning water tank from a cleaning agent water inlet pipeline; opening a cleaning valve A and a cleaning valve B; starting a cleaning pump, and keeping the cleaning agent circularly flowing in a closed-loop waterway formed in the medium-pressure ultraviolet sterilization device until a set time period (for example, 2 hours);
step 4.2, after chemical cleaning is finished, sequentially closing a cleaning pump, a cleaning valve A and a cleaning valve B; opening a drain valve of the medium-pressure ultraviolet sterilization device to drain residual cleaning sewage;
step 4.3, opening an inlet valve and an outlet valve, and continuously operating the medium-pressure ultraviolet sterilization device; after the medium-pressure ultraviolet sterilization device is stably operated for a set period of time (2 hours), the initial light transmittance A0 is recorded again.
The beneficial effects of the application are as follows: the medium-voltage ultraviolet sterilization device can be used for monitoring the attached pollutants of the ultraviolet lamp, optimizing the operation condition, reducing the labor cost and improving the sterilization efficiency. And the mechanical cleaning device and the ultrasonic cleaning device are arranged, so that the adhesion of pollutants of different types and different degrees can be effectively removed, and the device is suitable for the sterilization treatment of high-hardness high-pollution wastewater. The application has simple operation and maintenance and small occupied area, can be used for complete production of a new system, and can also be updated and reformed with low cost on the basis of an old system.
Drawings
FIG. 1 is a process flow diagram of a medium pressure ultraviolet sterilization system;
fig. 2 is a schematic diagram of the internal structure of the medium-pressure ultraviolet sterilization device.
Reference numerals illustrate: the device comprises a protective shell 1 of a medium-pressure ultraviolet sterilization device, a medium-pressure ultraviolet lamp tube 2, a mechanical cleaning device 3, an ultrasonic cleaning device 4, an outlet valve 5, a cleaning valve A6, a cleaning valve B7, a medium-pressure ultraviolet sterilization device 8, an inlet valve 9, a cleaning pump 10, a cleaning water tank 11 and a blow-down valve 12.
Detailed Description
The application is further described below with reference to examples. The following examples are presented only to aid in the understanding of the application. It should be noted that it will be apparent to those skilled in the art that modifications can be made to the present application without departing from the principles of the application, and such modifications and adaptations are intended to be within the scope of the application as defined in the following claims.
The medium-pressure ultraviolet sterilization system for automatic online cleaning can realize mechanical cleaning, ultrasonic cleaning and chemical cleaning simultaneously, and the matched control system automatically forms a cleaning scheme according to the ultraviolet light transmittance recovery degree and executes an online cleaning program to realize the scale-free cleaning operation of the medium-pressure ultraviolet device.
The application can clean the outer wall of the ultraviolet lamp sleeve in three different modes. In the running process of the medium-pressure ultraviolet sterilization device, the current light transmittance is fed back in real time through the built-in ultraviolet light transmittance sensor. After a control program built in the control device runs stably, when the light transmittance is increased, the mechanical cleaning device is automatically operated at first; when the mechanical cleaning cannot effectively clean the ultraviolet lamp sleeve, the ultrasonic cleaning device is automatically operated; when the ultrasonic cleaning can not effectively clean the ultraviolet lamp sleeve, an alarm is given and the chemical cleaning device is automatically operated. The ultraviolet lamp sleeve is cleaned by the method, the defect of insufficient ultraviolet dose caused by pollution can be avoided, and the sterilization and disinfection efficiency of the system is effectively improved.
Example 1
The first embodiment of the application provides a medium-pressure ultraviolet sterilization system for automatic online cleaning as shown in fig. 1:
comprising the following steps: a medium-pressure ultraviolet sterilization device 8, a mechanical cleaning device 3, an ultrasonic cleaning device 4 and a chemical cleaning system; wherein the chemical cleaning system comprises a cleaning water tank 11 and a cleaning pump 10;
an inlet valve 9 is arranged on the water inlet pipeline, and the water inlet pipeline behind the inlet valve 9 is respectively connected into the medium-pressure ultraviolet sterilization device 8 and the water washing tank 11 in two ways; a cleaning valve B7 is arranged on a water inlet pipeline branch connected with the cleaning water tank 11, the cleaning water tank 11 is connected with a cleaning agent water inlet pipeline, a water outlet and a cleaning liquid drain outlet are arranged on the cleaning water tank 11, the cleaning liquid drain outlet on the cleaning water tank 11 is connected with a cleaning liquid drain pipeline, and a drain valve 12 is arranged on the cleaning liquid drain pipeline; the water outlet of the cleaning water tank 11 is connected with one end of the cleaning pump 10 through a pipeline, the other end of the cleaning pump 10 is connected with a water outlet pipeline of the medium-pressure ultraviolet sterilization device 8, and a cleaning valve A6 is arranged on a connecting pipeline between the cleaning pump 10 and the water outlet pipeline of the medium-pressure ultraviolet sterilization device 8; the cleaning pump 10 is provided with an outlet valve 5 on a pipeline behind an access point on a water outlet pipeline of the medium-pressure ultraviolet sterilization device 8;
as shown in fig. 2, a medium-voltage ultraviolet lamp tube 2, a flowmeter, an ultraviolet light transmittance sensor, a temperature sensor, an ultraviolet light intensity sensor, a mechanical cleaning device 3 and an ultrasonic cleaning device 4 are arranged in the medium-voltage ultraviolet sterilizing device 8; each medium-voltage ultraviolet lamp tube 2 is provided with a set of mechanical cleaning device 3 and a set of ultrasonic cleaning device 4; the medium-voltage ultraviolet lamp tube 2 is embedded into the protective shell 1 of the medium-voltage ultraviolet sterilizing device and is perpendicular to the direction of the main tube of the medium-voltage ultraviolet sterilizing device; the mechanical cleaning device 3 is arranged on the outer wall of the medium-pressure ultraviolet lamp tube 2, and the mechanical cleaning device 3 is fixedly sleeved on the medium-pressure ultraviolet lamp tube 2 and can reciprocally rotate to scrub the medium-pressure ultraviolet lamp tube; the ultrasonic cleaning device 4 is fixedly connected to the inner wall of the medium-pressure ultraviolet sterilization device parent pipe beside the medium-pressure ultraviolet lamp tube 2, and the distance between the ultrasonic cleaning device 4 and the medium-pressure ultraviolet lamp tube 2 is smaller than a set value;
the outlet valve 5, the cleaning valve A6, the cleaning valve B7, the inlet valve 9 and the blowdown valve 12 are all electrically connected with the control device.
Example two
On the basis of the first embodiment, the second embodiment of the application provides an operation method of the medium-pressure ultraviolet sterilization system for automatic online cleaning in the first embodiment in a certain thermal power plant, which comprises the following steps:
surface water is taken as raw water in a certain thermal power plant, and is purified by a reverse osmosis system and then used as boiler makeup water. The colony number in the raw water is 2000-8000CFU/mL, and the reverse osmosis membrane and the security filter are easily blocked due to the fact that a large amount of microorganisms are easily proliferated in summer. The power plant adopts a medium-pressure ultraviolet sterilization device to kill microorganisms in reverse osmosis water, so that the use amount of the bactericide is reduced to the greatest extent. The medium pressure ultraviolet sterilization system used is equipped with a mechanical cleaning device and only supports on-site manual operation. Through analysis, attachments on the outer wall of the ultraviolet lamp sleeve in the continuous operation process of the system are divided into the following categories: (1) suspended matter in incoming water; (2) killed microbial debris; (3) microbial secretions; (4) scaling by multivalent cations. The mechanical cleaning device can only remove the attachments of the parts (1), (2) and (3), and has little cleaning effect on the attachments of the part (4). The mechanical cleaning frequency is about 3 days/time, and cleaning is usually performed when the deposit is already large. The system was run for 1000 hours and a layer of adherent scale had formed on the outer wall of the uv lamp sleeve that could not be removed by mechanical cleaning. The system runs for 2000 hours, the scale formation seriously affects the ultraviolet dose in water, the sterilization effect is far lower than the expected effect, and the system is shut down for pickling.
According to the embodiment, the original medium-pressure ultraviolet sterilization device is modified, each set of equipment is additionally provided with an ultrasonic cleaning device, a chemical cleaning system is arranged, and a control system is reset so that the cleaning operation can be automatically performed on line. Setting the warning value to be 5%, namely starting automatic mechanical cleaning when the light transmittance is lower than the initial light transmittance by more than 5%, starting automatic ultrasonic cleaning when the light transmittance is still lower than the initial light transmittance by more than 5% after mechanical cleaning, and prompting that chemical cleaning is needed when the light transmittance is still lower than the initial light transmittance by more than 5% after ultrasonic cleaning. After the operator agrees to perform the chemical cleaning, the reverse osmosis system is shut down and the chemical cleaning is automatically performed. The cleaning agent used in the chemical cleaning is 1% hydrochloric acid solution, and the total period of the cyclic soaking cleaning is 6 hours. The modified system was continuously operated for 6 months, and was automatically mechanically washed 127 times, automatically washed 11 times with ultrasonic waves, and automatically washed 1 time with chemical. After the medium-pressure ultraviolet lamp tube runs for 4000 hours, the dosage of the reverse osmosis water inlet ultraviolet rays is still kept at a higher level. The reverse osmosis water treatment system does not generate microbial pollution during the process, so that the operation and maintenance cost is reduced, the water production efficiency is improved, and the safety of power production is ensured.
The results show that the automatic online cleaning medium-pressure ultraviolet sterilization system and the operation process have good applicability. The medium-voltage ultraviolet sterilization device can be used for monitoring the attached pollutants of the ultraviolet lamp, so that the operation condition of a control program built in the control device is optimized, the labor cost is reduced, and the sterilization efficiency is improved. The device is provided with a mechanical cleaning device and an ultrasonic cleaning device, combines the three lamp tube cleaning modes of mechanical cleaning, ultrasonic cleaning and chemical cleaning, can automatically clean on line, ensures that the adhesion of pollutants of different types and different degrees can be effectively removed, and is suitable for the sterilization treatment of high-hardness and high-pollution wastewater. The application has simple operation and maintenance and small occupied area, can be used for complete production of a new system, and can also be updated and reformed with low cost on the basis of an old system.
Claims (6)
1. An operation method of an automatic online cleaning medium-pressure ultraviolet sterilization system, which is characterized by comprising the following steps: a medium-pressure ultraviolet sterilization device (8), a mechanical cleaning device (3), an ultrasonic cleaning device (4) and a chemical cleaning system; wherein the chemical cleaning system comprises a cleaning water tank (11) and a cleaning pump (10); an inlet valve (9) is arranged on the water inlet pipeline, and the water inlet pipeline behind the inlet valve (9) is respectively connected into the medium-pressure ultraviolet sterilization device (8) and the cleaning water tank (11) in two ways; a cleaning valve B (7) is arranged on a water inlet pipeline branch connected with the cleaning water tank (11), the cleaning water tank (11) is connected with a cleaning agent water inlet pipeline, a water outlet and a cleaning liquid drain outlet are arranged on the cleaning water tank (11), the cleaning liquid drain outlet on the cleaning water tank (11) is connected with a cleaning liquid drain pipeline, and a drain valve (12) is arranged on the cleaning liquid drain pipeline; the water outlet of the cleaning water tank (11) is connected with one end of a cleaning pump (10) through a pipeline, the other end of the cleaning pump (10) is connected with a water outlet pipeline of the medium-pressure ultraviolet sterilization device (8), and a cleaning valve A (6) is arranged on a connecting pipeline between the cleaning pump (10) and the water outlet pipeline of the medium-pressure ultraviolet sterilization device (8); an outlet valve (5) is arranged on a pipeline behind an access point on a water outlet pipeline of the medium-pressure ultraviolet sterilization device (8) of the cleaning pump (10);
a medium-pressure ultraviolet lamp tube (2), a flowmeter, an ultraviolet light transmittance sensor, a temperature sensor, an ultraviolet light intensity sensor, a mechanical cleaning device (3) and an ultrasonic cleaning device (4) are arranged in the medium-pressure ultraviolet sterilization device (8); each medium-voltage ultraviolet lamp tube (2) is provided with a set of mechanical cleaning device (3) and a set of ultrasonic cleaning device (4); the medium-voltage ultraviolet lamp tube (2) is embedded into the protective shell (1) of the medium-voltage ultraviolet sterilizing device and is perpendicular to the direction of the main tube of the medium-voltage ultraviolet sterilizing device; the mechanical cleaning device (3) is arranged on the outer wall of the medium-pressure ultraviolet lamp tube (2), and the mechanical cleaning device (3) is in non-fixed sleeving connection on the medium-pressure ultraviolet lamp tube (2); the ultrasonic cleaning device (4) is fixedly connected to the inner wall of the medium-pressure ultraviolet sterilization device parent pipe beside the medium-pressure ultraviolet lamp tube (2), and the distance between the ultrasonic cleaning device (4) and the medium-pressure ultraviolet lamp tube (2) is smaller than a set value;
the outlet valve (5), the cleaning valve A (6), the cleaning valve B (7), the inlet valve (9) and the blow-down valve (12) are all electrically connected with the control device;
the method comprises the following steps:
step 1, after a medium-voltage ultraviolet sterilization device (8) stably operates for a set time length, automatically recording initial light transmittance A0 by a control program arranged in a control device; during the continuous operation of the medium-pressure ultraviolet sterilization device (8), when the real-time light transmittance A1 monitored by the ultraviolet light transmittance sensor is smaller than the initial light transmittance A0-set warning value W, the mechanical cleaning device (3) executes mechanical cleaning, and the control program records the real-time light transmittance A2 within a set time period after the cleaning is finished;
step 2, if the real-time light transmittance A2 recorded in the step 1 meets the condition that A2 is more than or equal to A0-W, continuously repeating the step 1; if A2 is less than A0-W, the control program controls the ultrasonic cleaning device (4) to execute ultrasonic cleaning, and the real-time light transmittance A3 is automatically recorded in a set time period after the ultrasonic cleaning is finished;
step 3, if the real-time light transmittance A3 recorded in the step 2 meets the condition that A3 is more than or equal to A0-W, continuously and repeatedly executing the step 1; if A3 is less than A0-W, the control program sends out an alarm to prompt that chemical cleaning is to be performed;
and 4, stopping water entering and exiting the medium-pressure ultraviolet sterilization device (8), and controlling a program to control the chemical cleaning step after the chemical cleaning is confirmed to be executed manually.
2. The method of operating a medium pressure ultraviolet sterilization system for automatic on-line cleaning according to claim 1, wherein the mechanical cleaning device (3) in step 1 performs mechanical cleaning: the scraping sealing ring is moved from one end of the ultraviolet lamp tube to the other end in the single mechanical cleaning process, and then is returned from the other end to the initial position for 3 minutes.
3. The method of operating an automatic on-line cleaning medium pressure ultraviolet sterilization system according to claim 1, wherein: and (3) setting a chain protection and automatic alarm program on the control device in the step (1).
4. The method of operating an automatic on-line cleaning medium pressure ultraviolet sterilization system according to claim 1, wherein: in the step 1, the set time length for the stable operation of the medium-pressure ultraviolet sterilization device (8) is 2 hours; the warning value W was set to 5%, and the set time period after the end of the cleaning was 15 minutes.
5. The method of operating an automatic on-line cleaning medium pressure ultraviolet sterilization system according to claim 1, wherein: in the step 2, the ultrasonic cleaning frequency of the ultrasonic cleaning device (4) is 50-200 khz, and the duration of single cleaning of the ultrasonic cleaning device (4) is set value; the set time period after the end of ultrasonic cleaning was 15 minutes.
6. The method of claim 1, wherein the step of chemically cleaning in step 4 is specifically:
step 4.1, closing the inlet valve (9) and the outlet valve (5); the cleaning agent enters the cleaning water tank (11) from a cleaning agent water inlet pipeline; opening a cleaning valve A (6) and a cleaning valve B (7); starting a cleaning pump (10), and keeping the cleaning agent circularly flowing in a closed-loop waterway formed in the medium-pressure ultraviolet sterilization device (8) until a set time length;
step 4.2, after chemical cleaning is finished, sequentially closing a cleaning pump (10), a cleaning valve A (6) and a cleaning valve B (7); opening a blow-down valve (12) of the medium-pressure ultraviolet sterilization device (8) to empty residual cleaning sewage;
step 4.3, opening an inlet valve (9) and an outlet valve (5), and continuing to operate the medium-pressure ultraviolet sterilization device (8); and after the medium-pressure ultraviolet sterilization device (8) is stably operated for a set period of time, the initial light transmittance A0 is recorded again.
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