CN101058465A - Automatic control system for treating cooling circulation water system by ozone - Google Patents
Automatic control system for treating cooling circulation water system by ozone Download PDFInfo
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- CN101058465A CN101058465A CN 200710041040 CN200710041040A CN101058465A CN 101058465 A CN101058465 A CN 101058465A CN 200710041040 CN200710041040 CN 200710041040 CN 200710041040 A CN200710041040 A CN 200710041040A CN 101058465 A CN101058465 A CN 101058465A
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Abstract
The invention discloses a self-control system of ozone disposing cooling circulating water system, which is characterized by the following: detecting the thermal resistance of foul of circulating water in the system, the etching rate and micron index; comparing the data with the preset multi-parameter database; judging whether the condition of the circulating water is etching or fouling; providing convenience to do self-operating order of the system; directing the discharge of the circulating water and pump-valve operation of the water supplementation according to the judgment of the water condition; adjusting the real-time ozone happening quantity; making the circulated water quality satisfy the standard; increasing the circulating times of disposed water.
Description
Technical field
The present invention relates to a kind of automatization water treatment system, relate in particular to a kind of automatic control system for the treatment of cooling circulation water system by ozone.
Background technology
Fouling, corrosion phenomenon are to use modal problem in the heat exchanging apparatus system of recirculated cooling water, with the operation of harm equipment.The continuous in the course of the work vaporize water of open cooling tower is taken away heat, the many materials that exist in the water are concentrated, and constantly bring in the water polluting composition, dust, microorganism etc. in the atmosphere, if can not control the water quality of recirculated cooling water well, just can make heat exchanging apparatus (all kinds of refrigerators very soon, air compressor machine etc.) task performance reduces, pipeline obstruction, energy consumption increases considerably, and also can cause equipment corrosion, reduction of service life, cause very large economy loss.Because suitable water temperature is grown a large amount of bacteriums, particularly produce pathogenic bacterium (as legionella pneumophilia) public health is caused very big threat simultaneously.
Usually adopt chemical method and physics method to alleviate the above problem of recirculated cooling water at present.Chemical-agent technique adopts many different reagent and the complexing of water intermediate ion to alleviate fouling, regulate potential of hydrogen and prevent corrosion, with the sterilant sterilization, because these medicaments are influential mutually, the fouling tendency of water and corrosion tendency are again conflicting, therefore the water that promptly tends to fouling is not inclined to corrosion usually, and vice versa, regulates fouling tendency respectively and corrosion tendency is difficult to have concurrently two kinds of regulating effects.And the composition of water coolant but is to change at any time, and it changes and constantly changing with the composition of working condition, weather, make up water.And the regular dosing that chemical-agent technique adopts, be actually through after a while (as weekly or every month once) fouling or the corrosion tendency that take place in the correction water with lagging.Moreover medical method is handled practice and is upward come the electricity of Control Circulation water coolant to lead by discharging, and electricity is led to bring up to and to a certain degree carried out discharging.Lead high the time so replenish water power, the with medicament method is very difficult.In addition, the with medicament method can not very effective sterilization, and can develop immunity to drugs and lost efficacy, and needs in time to change.That medical method uses is phosphorous in a large number, zinc, chlorine, a class material of nitrogen, even during discharging in the water concentration up to standard, but require from the overall control of polluting, becoming a ton ground medicament to discharge year in year out obviously is that environment water is constituted very important harm.
Based on the problems referred to above, it is conspicuous adopting chemical-agent technique to come the defective of cycle of treatment water.
Aspect automatic control, existing at present dosing method adopts the mode of automatic monitoring system, and its monitor mode mainly is the chemical ingredients with water, as: calcium, magnesium, total alkali, chlorine equal size and potential of hydrogen (PH) and electric conductivity value are controlled the discharging of water with additional.But these data just judge that by indirect index the fouling of water or corrosion tendency implement control, and these indexs may not necessarily accurately reflect the water quality of water comprehensively.
Physical method is mainly used in scale inhibition, and it is to use in the magnetic field penetration water, makes the ion that forms dirt be in the state that surrounded by water molecules, is separated into little crystallization, is difficult for forming dirt in equipment surface.But find in the practical application water quality is had higher requirements, the de-sludging effect has limitation, and to corrosion and microorganism to kill validity not obvious.
Ozone method cycle of treatment water coolant is to begin to be tending towards sophisticated new technology over past ten years.By to injecting dissolved ozone in the recirculated water, in water, produce the very strong radicals such as OH of oxidisability, the microorganism in they and the water, chemical molecular reacts and reaches purification, sterilisation purpose.By suitable design, under the certain processing condition of control, the ozone method can substitute medical method and handle, and realizes effects such as scale inhibition, protection against corrosion, sterilization simultaneously.
Some basic experiences and result of study have been accumulated aspect the using ozone processing water coolant abroad since the nineties.The using ozone method has been proved to be and has been safety, effective, free of contamination cleaning technique in this field.Adopt the generating capacity of ORP (redox potential) control ozone in the practice, according to the electricity of water lead, indexs such as sodium, chlorine, calcium, magnesium and total alkalinity (POSI index, practical ozone scaling index) and bacterium, discharge and replenishment cycles water with manual operation.That is to say that at present the ozonize method does not enter the automatic control stage as yet, but rely on artificial regular measurement, take all factors into consideration a plurality of parameters after, carry out artificial discharging and replenishment cycles water.
The calculation formula of above-mentioned practical ozone scaling index POSI can allow to move under higher cycle index than chemical method.The POSI expression formula is as follows:
Wherein: Ca, Mg, ALK are respectively the calcium ion that lime carbonate is represented in the make up water, magnesium ion and total alkalinity (mg/litre); Cl, Na are respectively the concentration (mg/litre) of chlorine and sodium ion in the make up water; C0 is for replenishing electrical conductivity of water, and C1 is that recirculated water allows its maximum conductance value that reaches.C1/C0 is the cycles of concentration or the cycle index of recirculated water, and the utilization ratio of the high more expression water of this value is high more, and water-saving result is had a significant impact.On the other hand,, also can cause fouling, grow microorganism, form dirt and produce bacillary corrosion when the discharge water deficiency.
Yet C1 and C0 are possible on the low side with the cycle index that electric conductivity value calculates gained in the POSI formula, therefore control the circulation of water and discharge with this index often can't reach top efficiency.The someone advises that certain constituent concentration that exists in the water replaces specific conductivity to calculate C1/C0 for this reason, for example: can reach higher cycle index with sodium, total alkali, silicon isoconcentration, but be difficult to realize automatic monitoring in the actually operating, and inconvenient.So the POSI numerical value that following formula is expressed still has uncertainty.The more important thing is, change that seasonal variation and operating mode change all can directly have influence on determining of POSI value again because replenish water quality regular meeting in practice.For example to lead the amplitude of variation own very big for the electricity of this city tap water, cause the variation of the POSI value preset, and when using other source water to make make up water, also can not guarantee to have all the time stable electricity to lead and keep the constant of other compositions, therefore in these cases, only adopt the POSI that under stable case, calculates to weigh fouling tendency with unreliable.
In view of the above problems, designing the recirculated water index in a kind of comprehensive reflection ozonize recirculating cooling water system, and utilize these indexs to realize the system of the automatic control of recirculated cooling water, is the key that the ozonize method is promoted development.
Summary of the invention
Technical problem to be solved by this invention provides a kind of automatic control system for the treatment of cooling circulation water system by ozone, it can detect various parameters in the cooling circulating water system, determine to reflect the direct indicator of water quality in view of the above, when some key index surpasses regulation, carry out ozone concn adjusting or discharging and make up water automatically.
The present invention solves the problems of the technologies described above the technical scheme that adopts to be: the automatic control system that a kind for the treatment of cooling circulation water system by ozone is provided, be used for the detection control of cooling circulating water system, this cooling circulating water system comprises water collecting basin, one provides the cooling tower of water coolant to water collecting basin, one flows to the unit cooler of cooling tower after the water collecting basin output water cooling, and one in order to inject the ozonizer of ozone, this water collecting basin bottom is provided with a bleed valve, it is characterized in that, this automatic control system comprises: the parameter acquisition device, it comprises a real time data detecting unit, this real time data detecting unit has a plurality of transmitters, in order to one group of real-time parameter of automatic collection, this real-time parameter comprises the microbiological indicator for the treatment of water at least, and can determine the fouling resistance value for the treatment of water at least; Monitoring device is connected with the parameter acquisition device, and it comprises an analytical unit, in order to calculate described fouling resistance value according to described real-time parameter; Control device is connected with monitoring device, and it comprises: a database, in order to store fouling resistance value, the preset value of microbiological indicator and the preset range of ozone concn; One ozone concn control unit according to the microbiological indicator of measuring and the comparative result of the microbiological indicator preset value in the database, is determined a reference mark and is exported described ozonizer in the preset range of described ozone concn; And a cooling circulating water exhaust unit, the fouling resistance value of comparative measurement and the fouling resistance value preset value in the database, and during greater than described preset value, export the bleed valve that a control signal is opened the water collecting basin bottom in the fouling resistance value of measuring.
In the above-mentioned automatic control system, described monitoring device also comprises: output control signal corresponding when unusual, in order to showing described real-time parameter and water-quality guideline, and take place in a certain parameter or index in a system monitoring unit; One alarm unit, according to the unitary control signal of system monitoring, the warning of output corresponding prompt.
In the above-mentioned automatic control system, described microbiological indicator comprises biological clay and/or total plate count.
In the above-mentioned automatic control system, the calculation formula of described fouling resistance value R is:
Wherein A is the heat exchanger heat transfer area of described unit cooler, and T1/T2 is the import/export temperature of thermal medium, t1/t2 be cooling circulating water advance/go out temperature, G is the cooling water flow by heat exchanger, Cp is a specific heat of water.
In the above-mentioned automatic control system, described real-time parameter also comprises the corrosion rate for the treatment of water.
In the above-mentioned automatic control system, described parameter acquisition device also comprises a data input cell, in order to receive one group of regular parameter of outside input.Wherein can determine practical ozone scaling index POSI in conjunction with described real-time parameter and regular parameter.
In the above-mentioned automatic control system, described real-time parameter also comprises second redox potential of heat exchanger of first redox potential, the unit cooler of ozone water decanting point, and described ozone concn control unit also comprises a PID setter, as feedback signal, regulate the ozone generating capacity of described ozonizer with described first redox potential and second redox potential.
In the above-mentioned automatic control system, described cooling circulating water system also comprises a strainer, a recoil pump and a recoil valve, described strainer is located on the import circulation line of described unit cooler, and described recoil pump import is connected with the water source, and the recoil pump outlet is connected with strainer through recoil valve; And described control device also comprises the recoil control unit, in order to according to the pressure difference at described strainer two ends and the comparative result of a preset value, output one controls signal to described recoil pump and recoil valve, make the water in the described water source enter into strainer, wherein dirt is washed away by recoil pump and recoil valve.
In the above-mentioned automatic control system, the preset range of ozone concn is in the described database: the ozone water decanting point is 0.5～1.5ppm, and the heat exchanger inlets place of unit cooler is 0.02～0.1ppm.
The present inventor finds through practice, is the direct indicator that is used for weighing the fouling tendency of recirculated water with fouling resistance value R, can stablize and reflect accurately the fouling tendency of recirculated water.Fouling resistance value R is combined with the corrosion rate and the microbiological indicator of water, can be comprehensively and directly reflect the water quality of recirculated water, thus be provided for the accurate foundation of control automatically.Because adopt above technical scheme, the present invention can reach following beneficial effect at least:
1. by automatic control system of the present invention, can monitor the fouling of ozonize recirculated cooling water in real time, three main directly water-quality guideline of corrosion and microorganism, keep the well balanced state of water quality under the conditions such as make up water of the operating mode of guarantee cooling circulating water earthquake, season, different sources, realize scale inhibition simultaneously, the clean conditions of protection against corrosion and low microorganism.
2. by the present invention, make ozonization cooling water circulation realize effectively Detection ﹠ Controling in real time, to improving the heat exchanger efficiency, reduce corrosion, improving service life of equipment has great important.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is the cooling circulating water system synoptic diagram that adopts automatic control system of the present invention.
Fig. 2 is the automatic control system structured flowchart of one embodiment of the invention.
Embodiment
The present invention is the automatic control system for ozone method cycle of treatment cooling water system design, be used to realize following purpose: set up with direct water quality fouling, burn into microbiological indicator and chemistry, the multiparameter database that physical index combines is set the equilibrated final condition that can guarantee water quality according to the operating mode and the water condition of different user.It mainly carries out following work: at first, mensuration by multiparameter, the recirculated water state that monitoring constantly changes, and the direct indicator of getting wherein contrasts with the database that presets, judging that the residing state of recirculated water is corrosion or fouling tendency, so that the automatic operational order of implementation system dynamically.Secondly, according to the front discharging of the judgement commander cooling circulating water of the state of water and the pump valve of make up water are operated.Moreover, to the discharging of the judgement of the state of water and water with replenish, regulate the ozone generating capacity in real time: increase when needing, reduce when not required according to the front.
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing.
Fig. 1 is the cooling circulating water system synoptic diagram that adopts automatic control system of the present invention.Fig. 2 is the automatic control system structured flowchart of one embodiment of the invention.Please consult shown in Figure 1ly earlier, the full cycle cooling water system mainly comprises cooling tower 70, water collecting basin 71 and unit cooler 72.Wherein circulating water flow is to being: flow to unit cooler 72 from water collecting basin 71, by with flow to cooling tower 70 after the hot surface of unit cooler contacts, flow back to water collecting basin 71 again through spray.Because the discharging or the evaporation of recirculated water, when causing water level in the water collecting basin 71 to be lower than certain water level, come by-pass valve control 79 by ball float level controller 78, realize that recirculated water is from replenishing the automatic water supplement at water source 80.
Be provided with many transmitters in the total system, detect data, for example: in the cooling water replenishment ingress electricity is installed and is led probe 60, be connected with conductivity meter table 40 by lead, as a supplement the electric conductivity value of water with real-time online.Refrigeration cycle current direction unit cooler 72 1 sides circulating water pipeline in a under meter 61 is installed, be connected with rate of flow meter 41 by lead, as the flux values G of cooling circulating water; A temp probe 62 is installed, is connected with thermometer 42, as cooling inflow temperature value t1 by lead; An online tensimeter 43 is installed, as the recoil inlet pressure in the inlet duct of strainer 75; An online tensimeter 44 is installed, as the recoil top hole pressure in the outlet conduit of strainer 75; Cooling circulating water flow out unit cooler 72 1 sides circulating water pipeline in a temp probe 55 is installed, be connected with thermometer 35 by lead, as cooling off leaving water temperature(LWT) value t2.Influx at the thermal medium of unit cooler 72 is installed a temp probe 53, is connected with thermometer 33 by lead, as the temperature in T1 of thermal medium; At the spout of thermal medium a temp probe 54 is installed simultaneously, is connected with thermometer 34 by lead, as the temperature out T2 of thermal medium.At the flow ipe of cooling circulating water with flow out bypass of design between the pipeline, an online corrosion rate instrument 73 is installed in this bypass, be used to test the corrosion rate of cooling circulating water to metal (for example soft steel, red copper).
Hold above-mentioned, one section pipeline of design between refrigeration cycle waterpipe that flows to unit cooler 72 and water collecting basin 71, be used for the injection of ozone, near the water collector side nozzle 76 be installed in this pipeline, the ozone that ozonizer 20 is produced injects circulating water system by nozzle 76; In the front of nozzle 76 an ORP probe 59 is installed, is connected with ORP instrument 39, be used to detect the ozone concn ORP1 of ozone decanting point by lead; A topping-up pump 77 is installed at rear at nozzle 76, is used for guaranteeing the hydraulic pressure and the flow of this pipeline.Flow into the pipeline place near recirculated water in this pipeline following measuring instrument is installed: electricity is led probe 50, is connected with conductivity meter table 30 by lead, as the electric conductivity value of cooling circulating water; PH probe 51 is connected with PH instrument 31 by lead, as the pH value of cooling circulating water; ORP probe 52 is connected with the ORP instrument by lead, as the ozone concn feedback signal ORP2 in ozone control usefulness.
In addition, a strainer 75 is installed in the inlet duct of coolant circulation pump 81, and the suspended particle of this strainer 75 in can filtration cycle water makes its deposition, and the water in the recoil water source 82 can be by recoil valve 22 and recoil pump 23, spring back in the strainer 75, the dirt deposition inside it is washed away.
Should be pointed out that above-mentioned transmitter and instrument all are to decide according to the parameter needs that desire is gathered, the position of its kind, quantity and setting all is not used in qualification the present invention.
Above-mentioned all instrument signals all are the monitoring devices 120 (please in conjunction with consulting Fig. 2) of passing to automatic control system 100 by RS485 bus communication mode, and can will need the parameter of participation system control to pass to control device 130 in the monitoring device by special-purpose communication cable, the various signals that control device 130 will receive carry out computing, control ozonizer 20 then respectively, recirculated water vent valves 21, recoil valve 22 in the recoiling device and recoil pump 23.
See also shown in Figure 2ly, this automatic control system 100 is by four most of compositions that connect successively, and promptly the parameter acquisition device 110, monitoring device 120, control device 130 and topworks 140.Parameter acquisition device 110 is responsible for the detection and the input of parameter, and monitoring device 120 is finished the storage of various data and demonstration; Control device 130 is responsible for the logic of The whole control system is judged and computing, by it and the mode that monitoring device 120 combines, becomes the core of total system, the action of commander topworks 140.Wherein, topworks promptly comprises the ozonizer 20 shown in Fig. 1, bleed valve 21, recoil valve 22 and recoil pump 23.
Hold above-mentionedly, parameter acquisition device 110 further comprises real time data detecting unit 111 and data input cell 112.Real time data detecting unit 111 promptly comprises all the sensors shown in Fig. 1, in order to the various parameters of real-time collection, passes to monitoring device 120 by the communication modes of fieldbus, and to reach real-time, accurate effect, these parameters are listed in following table 1 classification:
| The indirect index of water quality | The recirculated cooling water specific conductivity |
| The make up water specific conductivity | |
| The recirculated cooling water pH value | |
| The calculating parameter of fouling resistance value R | Cooling inflow temperature t1 |
| Cooling leaving water temperature(LWT) t2 | |
| Thermal medium temperature in T1 | |
| Thermal medium temperature out T2 | |
| Circulating cooling water flow G | |
| The horizontal index of corrosion rate | Soft steel/copper corrosion rate |
| The ozone concn parameter | The first redox potential ORP1 |
| The second redox potential ORP2 | |
| System operational parameters | Filter inlet pressure |
| Filter outlet pressure | |
| The ozonizer cooling water pressure | |
| The ozonizer cooling water flow |
Table 1
It may be noted that the transmitter that detects ozonizer cooling water pressure, these parameters of ozonizer cooling water flow is not shown among Fig. 1, yet those skilled in the art can be arranged on the appropriate location fully as required.
| The indirect index of water quality | Total alkalinity, calcium ion, sodium ion, magnesium ion, chlorion |
| Turbidity | |
| The TOC/ five-day BOD | |
| Microbiological indicator | Biological clay |
| Total plate count | |
| The ozone concn parameter | The first ozone concn DO31 |
| The second ozone concn DO32 |
Table 2
Wherein first ozone concn is the ozone concn of ozone water decanting point, and second ozone concn is the ozone concn of heat exchanger inlets, can be used for proofreading and correct the above-mentioned first redox potential ORP1 and the second redox potential ORP2.
Because the not frequent or online testing cost of these data variation is higher, thereby adopt that portable instrument is artificial to be gathered or the method for chamber test by experiment, the data that manually record are passed to monitoring device 120 through data input cell 112, cost-saved.Especially at present also can measure in real time such as microbiological indicators such as biological clay, total plate count by the on-line detector device, but because this quasi-instrument costs an arm and a leg, and that detects in real time has little significance, for saving cost, employing is by the mode of data input cell 112 inputs, yet the present invention does not limit the acquisition mode of parameter, and promptly embodiments of the invention can utilize the on-line detector device to gather microbiological indicator or difficult at present other indexs that adopt online detection mode to gather such as biological clay, total plate count.
The effect of water quality analysis unit 121 at first is described, water quality analysis unit 121 is used for the data that detected according to above-mentioned parameter gathering device 110 (mainly being real time data detecting unit 111), calculates fouling resistance value R and is transferred to system monitoring unit 122.Fouling resistance value R is the direct indicator that is used for weighing the fouling tendency of recirculated water, the foundation of discharge water as eliminating fouling tendency in the present invention, and it can draw by following formula:
Wherein R is the fouling resistance of cooling circulating water, A is the heat exchanger heat transfer area, it is predictable fixed value, T1/T2 be thermal medium advance/go out temperature, t1/t2 be cooling circulating water advance/go out temperature, G is the cooling water flow by heat exchanger, and Cp is a specific heat of water, gets 4.15kJ/kg. ℃ usually.
In addition, for the practical ozone scaling index of another one recirculated water fouling tendency index POSI, though it is not accurate enough as fouling tendency merely.But related data that can POSI as a reference, plays the effect of early warning.Therefore, the parameter that water quality analysis unit 122 is also obtained according to parameter acquisition device 110 is calculated POSI and is transferred to 122 demonstrations of system monitoring unit, and its expression formula is as follows:
Wherein: Ca, Mg, ALK are respectively the calcium ion that lime carbonate is represented in the make up water, magnesium ion and total alkalinity (mg/litre); Cl, Na are respectively the concentration (mg/litre) of chlorine and sodium ion in the make up water; C0 is for replenishing electrical conductivity of water, and C1 is that recirculated water allows its maximum conductance value that reaches.C1/C0 is the cycles of concentration or the cycle index of recirculated water.
System monitoring unit 122 is used to monitor the value of each parameter and the operation conditions of system.Comprising: the scaling index POSI of all image data, fouling resistance value, recirculated water maximum conductivity, make up water, the scaling index POSI of recirculated water, the working order of the working order of the running status of ozonizer 20, vent valves 21, recoil valve 23, target circulation ratio, national water quality reference standard etc.When certain parameter that is monitored occurs when unusual, system monitoring unit 122 will send control signal corresponding, deliver to alarm unit 124, carry out corresponding action.
Next the working process of alarm unit 124 is described.When alarm unit 124 receives the control signal of system monitoring unit 122 outputs, will produce corresponding the warning.These warnings can be divided into the warning of equipment state and the warning of water-quality guideline.Equipment state is reported to the police for instance; be low excessively when ozonizer 20 cooling water pressures, components and parts are overheated, oxygen pressure is low excessively, the ozone concentration leakage etc. that exceeds standard is arranged in the air; alarm unit 124 will be reported to the police and be cut off the electricity supply automatically; protection equipment and site safety, can resume operation after needing the user to fix a breakdown by maintenance this moment.And the indicative warning of water quality is promptly done indicative warning to the user for instance under following situation: surpass the value (cycles of concentration) of measuring and estimating according to POSI when specific conductivity; When calcium hardness surpasses 500, when chlorine ion concentration surpasses 1000 mg/litre, when total alkalinity surpasses 500 (in lime carbonate), pH value is less than 8 and individual ions such as phosphoric acid salt, the higher grade of vitriol all can be done indicative warning, cause that the user pays close attention to,, therefore can suitably intervene maybe and wouldn't handle because these indexs are not the direct indicator of reflection water quality.It may be noted that simultaneously since these indexs as just reference, so index choice, and the preset value of index all can be determined voluntarily by the user, and be not must be at above-mentioned whole indexs do indicative warning unusually.
The data that data storage cell 123 need be preserved in order to storage, the data after comprising collection, import and analyzing.In one embodiment; data storage cell 123 is as storer with SDRAM; carry out power-off protection by internal cell, and can the historical data in the SDRAM storer be shifted, make things convenient for the user to carry out data processing and carry out data archival and preserve by the USB mobile memory.
Preserve the processing parameter (for example table 1, the listed parameter of table 2) that from monitoring device 120, obtains in the database 131, and the preset value of various processing parameters, be to be used to judge whether normally foundation of each real-time parameter.The preset value of these parameters for example is: fouling resistance value: 3*10
-4m
2K/W, biological clay: 4ml/m
3, total plate count 3000CFU/ml, corrosion of carbon steel rate 0.125mm/, first ozone concn (ozone water decanting point): 0.5～1.5ppm, second ozone concn: 0.02～0.08ppm.It should be noted that these preset values and preset range only are for example, actual preset value and preset range can be according to the change of water quality of make up water, and perhaps the variation of season and operating mode is adjusted.
Ozone concn control unit 132 is used for the ozone concn of water is controlled automatically.It mainly determines ozone concn reference mark best in the recirculated water according to the preset range of the index in microbiological indicator and the database 131, when the biological clay of measuring surpasses preset value 4ml/m
3, when perhaps total plate count surpasses 3000CFU/ml, in the preset range of 0.5～1.5ppm, improve above-mentioned first ozone concn, and in 0.02～0.08ppm preset range, improve above-mentioned second ozone concn.In addition, ozone concn control unit 132 has a PID controller (figure does not show) usually, after determining good suitable ozone concn reference mark, by with pipeline in ORP probe 59, the 52 redox potential ORP1 that collect, the pairing ozone concn of ORP2 compares, give PID controller with the size and the variation speed of this comparative figure, the PID controller is given ozonizer 20 according to operation result output 4-20mA analog signals m, the ozone of corresponding amount takes place in ozonizer 20 immediately according to the analog quantity size of input, and be injected into by nozzle 76 in the pipeline of cooling circulating water, finished the PID closed-loop control of ozone concn.
The preset range of first, second ozone concn can be reduced into a point, for example in one embodiment, first ozone concn can be set at 1ppm, and second ozone concn is set at 0.02ppm.In another embodiment, first ozone concn can be set at 0.57ppm, and second ozone concn is set at 0.05ppm.Under these situations, first, second ozone concn will adjust near preset value slightly.
May there be deviation in the ozone concn of above-mentioned redox potential ORP1, ORP2 and reality, for this reason, can come redox potential ORP1, ORP2 are proofreaied and correct by the first ozone concn DO31, the second ozone concn DO32 that measures ORP1, ORP2 position, for example carry out fitting of a straight line, to improve accuracy of measurement.
Whether cooling-water drain control unit 133 is primarily aimed at the fouling tendency and the corrosion tendency decision of water coolant and discharges.In one case, the preset value of R in fouling resistance value R that cooling-water drain control unit 133 relatively calculates and the database 131 is when fouling resistance value R reaches upper limit 3*10 in the database 131
-4m
2During K/W, cooling-water drain control unit 133 output control signal p make it open the water that discharges in the water collecting basin to the bleed valve 21 of water collecting basin 71 belows.When the water level in the water collecting basin 71 was lower than certain water level, ball float level controller 78 autocontrol valves 79 realized that recirculated water is from replenishing the automatic water supplement at water source 80.After this, continue to adjust, lead second into 2000uS/ up to detected circulation water power.In another case, the soft steel corrosion rate of cooling-water drain control unit 133 comparison loop water and the preset value 0.125mm/ in the database 131, when the soft steel corrosion rate surpasses 0.125mm/, the numerical value that cooling-water drain control unit 133 needs with reference to fouling resistance value and microbiological indicator, if these two indexs are all qualified, then can not draining there be higher electricity to lead, can reduces corrosion on the contrary to keep system.
Certainly, because through after the discharging, the ozone concn in the water changes, so ozone concn control unit 132 also can be adjusted the generating capacity of ozonizer 20 according to the feedback of the first redox potential ORP1 and the second redox potential OPR2.
In system shown in Figure 1, in order to remove the suspended solids of the powder in the recirculated water, improve the degree of cleaning and the ozone efficient of water, adopt other filter technology, be provided with the recoiling device of forming by strainer 75, recoil valve 22 and recoil pump 23, and in Controlling System, designed recoil control unit 134 for this reason.Simultaneously, a tensimeter (43,44) respectively is installed on the both sides of strainer 75, and with these two pressure signals (through monitoring device 120) be sent to the recoil control unit 134, the pressure difference and the preset value of two pressure signals are compared, when this pressure difference surpasses preset value, recoil control unit 134 output control signal f open recoil valve 22 automatically, with recoil pump 23 dirt are washed away.Facts have proved that the employing recoiling device can reduce the suspended solids in the recirculated water greatly, the degree of cleaning of water are provided.Yet it may be noted that the major function realization that recoiling device does not influence system is not set.
In sum, automatic control system of the present invention is applied in the cooling-tower circulating water, various direct indicators such as comprehensive corrosion rate, online fouling resistance value and microorganism adopt Intelligentized control method to judge corrosion tendency and the fouling tendency of recirculated water under different quality and working condition.By comparing to determine suitable ozone concn value in the recirculated water, realize the closed-loop control of ozone concn in the recirculated water by the PID setter of ozone concn control unit 132 with database 131; With the vent valves 21 of timed unit 130 by the automatic Control Circulation water of each parameter such as fouling resistance value of comparison loop water, and the size of passing through the front and back pressure difference value of strainer 75, recoil pump 23 and recoil valve 22 controlled automatically; System controls in real time and keeps cooling circulating water to be in state to preventing that fouling, corrosion and microorganism are best under different operating modes.Therefore compared to existing technology, the present invention has the following advantages:
1. by multiparameter system of the present invention, can monitor the fouling of ozonize recirculated cooling water in real time, three main directly water-quality guideline of corrosion and microorganism, keep the well balanced state of water quality under the conditions such as make up water of the operating mode of guarantee cooling circulating water earthquake, season, different sources, realize scale inhibition simultaneously, the clean conditions of protection against corrosion and low microorganism.Handle the traditional method that can substitute the adding various medicaments with the ozone method.Its every index all is better than traditional medical method: can efficiently kill and cause the corrosive heterotrophic bacterium, reduce the total plate count of water significantly, kill algae and pathogenic legionella.And, because the ozone method do not make with medicament, thereby eliminated the chemical pollution that the water discharging causes from the source to environment.
By the present invention, make ozonization cooling water circulation realize effectively Detection ﹠ Controling in real time, compare the method that adopts hand control, improved the heat exchanger efficiency, reduce corrosion, and improved service life of equipment.
2, by the relevant estimation of the present invention to recirculated water fouling tendency (POSI) in the ozonize, in conjunction with other relevant processing parameters, determine the recycle number of times (or claiming cycles of concentration) of permission according to different refrigeration cycle aqueous systems, and discharging and replenishment cycles water by controlling automatically, realization improves the utilising efficiency of water to greatest extent.This kind control method has proved than medical method and can allow higher electricity to lead, meaned bigger cycles of concentration.The cycle index of conventional process is 2-3 time at present, can bring up to 5-10 time with present technique, in addition higher.The present invention can utilize different water sources to make recirculated water (for example utilizing some technology to discard water, reuse water etc.).By prior analytical calculation and control, effectively realize water saving significantly.Practice result proves that the present invention is well to the correction actual effect of POSI, the utilization ratio of water can be improved much than calculated value, and guaranteed the comprehensive conformance with standard of water quality.
3, intelligent control system can combine the discharging of water with additional and ozone generating capacity, dynamically adjusts quantity and concentration that ozone takes place at any time.By PID control the ozone generating capacity of system can be changed with working condition, for example in water because air or the organism that drops into increase, or because climate reasons when biological mud is increased, the ozone generating capacity will increase, otherwise will reduce.This design not only makes system become more effective, but also the energy consumption of reduction system itself.
Above embodiment explanation only is preferred embodiment explanation of the present invention, and those skilled in the art can make the replacement and the modification of other all equivalence according to the above embodiment of the present invention explanation.Yet these all equivalences of doing according to the embodiment of the invention are replaced and are revised, and belong to invention spirit of the present invention and reach by in the claim that claim defined.
Claims (10)
1. the automatic control system of a treating cooling circulation water system by ozone, be used for the detection control of cooling circulating water system, this cooling circulating water system comprises that water collecting basin, provides the cooling tower, of water coolant to flow to the unit cooler and of cooling tower in order to inject the ozonizer of ozone after water collecting basin output water cooling to water collecting basin, this water collecting basin bottom is provided with a bleed valve, it is characterized in that this automatic control system comprises:
The parameter acquisition device, it comprises a real time data detecting unit, and this real time data detecting unit has a plurality of transmitters, in order to one group of real-time parameter of automatic collection, this real-time parameter comprises the microbiological indicator for the treatment of water at least, and can determine the fouling resistance value for the treatment of water at least;
Monitoring device is connected with the parameter acquisition device, and it comprises an analytical unit, in order to calculate described fouling resistance value according to described real-time parameter;
Control device is connected with monitoring device, and it comprises: a database, in order to store fouling resistance value, the preset value of microbiological indicator and the preset range of ozone concn; One ozone concn control unit according to the microbiological indicator of measuring and the comparative result of the microbiological indicator preset value in the database, is determined a reference mark and is exported described ozonizer in the preset range of described ozone concn; And a cooling circulating water exhaust unit, the fouling resistance value of comparative measurement and the fouling resistance value preset value in the database, and during greater than described preset value, export the bleed valve that a control signal is opened the water collecting basin bottom in the fouling resistance value of measuring.
2. automatic control system as claimed in claim 1 is characterized in that, described monitoring device also comprises:
Output control signal corresponding when unusual in order to showing described real-time parameter and water-quality guideline, and takes place in a certain parameter or index in one system monitoring unit;
One alarm unit, according to the unitary control signal of system monitoring, the warning of output corresponding prompt.
3. automatic control system as claimed in claim 1 is characterized in that described microbiological indicator comprises biological clay and/or total plate count.
4. automatic control system as claimed in claim 1 is characterized in that, the calculation formula of described fouling resistance value R is:
Wherein A is the heat exchanger heat transfer area of described unit cooler, and T1/T2 is the import/export temperature of thermal medium, t1/t2 be cooling circulating water advance/go out temperature, G is the cooling water flow by heat exchanger, Cp is a specific heat of water.
5. automatic control system as claimed in claim 1 is characterized in that described real-time parameter also comprises the corrosion rate for the treatment of water.
6. automatic control system as claimed in claim 1 is characterized in that, described parameter acquisition device also comprises a data input cell, in order to receive one group of regular parameter of outside input.
7. automatic control system as claimed in claim 6 is characterized in that, described real-time parameter and regular parameter can be determined practical ozone scaling index POSI.
8. automatic control system as claimed in claim 2, it is characterized in that, described real-time parameter also comprises second redox potential of heat exchanger of first redox potential, the unit cooler of ozone water decanting point, and described ozone concn control unit also comprises a PID setter, as feedback signal, regulate the ozone generating capacity of described ozonizer with described first redox potential and second redox potential.
9. automatic control system as claimed in claim 1, it is characterized in that, described cooling circulating water system also comprises a strainer, a recoil pump and a recoil valve, described strainer is located on the import circulation line of described unit cooler, described recoil pump import is connected with the water source, and the recoil pump outlet is connected with strainer through recoil valve; And described control device also comprises the recoil control unit, in order to according to the pressure difference at described strainer two ends and the comparative result of a preset value, output one controls signal to described recoil pump and recoil valve, make the water in the described water source enter into strainer, wherein dirt is washed away by recoil pump and recoil valve.
10. automatic control system as claimed in claim 1 is characterized in that, the preset range of ozone concn is in the described database: the ozone water decanting point is 0.5～1.5ppm, and the heat exchanger inlets place of unit cooler is 0.02～0.1ppm.
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