Background technology
In reverse osmosis water treating processes, the concentration of suspended particle, organism and dissolved matter constantly increases.Suspended particle and organic deposition, on film, stop up inlet conduit.Difficulty soluble salt, in the time exceeding its saturation limit, can be precipitated out from dense water, forms fouling on face, reduces the flux of reverse osmosis membrane, increases operating pressure, and causes product deteriorating water quality.That prior art conventionally adopts is softening, oxidation, acid adding, the method that adds Scale inhibitors are carried out pre-treatment to the former water entering before reverse osmosis membrane system, system complex, and medicament and energy consumption are high.
patent content
This patent has proposed to adopt active carbon filtration to add pretreatment system and the control device of electronic anti-scaling, does not need to add Scale inhibitors and complicated softening equipment is set, and can ensure reverse osmosis membrane reliability service.Simultaneously electronic anti-scaling can activated water molecule, improves reverse-osmosis treated ability.This patent can effectively reduce the running cost of investment cost and system.
Electronic anti-scaling device is to design based on alternating electromagnetic field principle, produces by signal generator the electric current that a kind of polarity, amplitude and frequency change at a high speed, and this electric current produces again fast-changing magnetic field in pipeline, to the Ca in water
2+, Mg
2+produce a kind of ion interference effect, can change electrochemical properties and the physical property of these ions, reduce Ca
2+, Mg
2+, CO
3 2-, SO
4 2-between adsorptive power, be combined into dirt thereby stop between these ions.
The input signal that participates in the control of electronic anti-scaling device comprises pH value, hardness, the flow parameter of feed water by reverse osmosis.Programmable logic controller is according to the each parameter influence coefficient setting control system under different quality operating mode.
Before electronic anti-scaling device, charcoal filter is installed, the one, can adsorb organic compound, reduce feed water by reverse osmosis COD value, avoid the pollution of organism to reverse osmosis membrane.The reduction of the 2nd, COD can improve the effect of the scale inhibition of electronic anti-scaling device.
The magnetic field induction that electronic anti-scaling device produces reduces microbial film bond strength in solid and pipeline, the smooth non-adhesive surface of its needle-shaped crystal structure, be soft cotton-shaped being suspended in medium with medium flowing, avoid to the deposition on wall and film surface, reach the object that prevents fouling, can play activated water molecule, improve the effect of seepage force simultaneously.
Electronic anti-scaling device can carry out respectively parameter setting targetedly according to different treatment media and processing condition, thereby produce the most effective the most applicable pulsed voltage and frequency of modulation pulse, the signal that control device produces can be input in multiple electronic anti-scaling device winding inductor blocks, realizes many pipeline application of a machine.Control device has liquid-crystal display monitoring flow and frequency conversion current output value and operation warning instruction.
The electronic anti-scaling device scope of application is wide, can be widely used in different pipe diameters, different flow, different media, to water (flow) direction, pipeline, system pressure are all unrestricted anyhow.
Embodiment
The embodiment of this patent: as shown in Figure 1, former water is through the organism in charcoal filter Adsorption water, water after filtration is through being arranged on the electronic anti-scaling device activation treatment on pipeline outer wall, activation treatment can prevent dissolved salts fouling, the water of activation treatment enters cartridge filter, remove fine particulates, then squeeze into reverse osmosis unit through high-pressure pump supercharging and carry out membrane separation.
Above-mentioned electronic anti-scaling reverse osmosis system and control device: comprise the charcoal filter, electronic anti-scaling device, cartridge filter, high-pressure pump, the reverse osmosis unit that are connected successively through pipeline, also comprise the PH on line analyzer, hardness on line analyzer, flow sensor, flow transmitter and the programmable logic controller that are arranged on after charcoal filter.
Electronic anti-scaling device is controlled by pH value, hardness, the flow parameter of water inlet.The programmable logic controller of control device can carry out parameter setting according to different quality operating mode.
The embodiment of this patent also comprises conventional control instruments setting and chain control.Comprising the thermometer that generally needs to install, tensimeter, specific conductivity table, chlorine residue table, redox potential table etc., place and the effect thereof of installing are described below:
(1) thermometer
Feed temperature table is for Real-Time Monitoring feed temperature.Relevant with temperature because of the water production rate of reverse osmosis, need to be controlled between 15 DEG C ~ 25 DEG C, so must monitor to obtain standard water production rate.In addition, temperature exceedes 45 DEG C can damage membrane element, therefore should establish the protection of overload alarm, overtemperature water automatic-discharging and stoppage in transit RO to former water heater system;
(2) tensimeter
Feed pressure table is for Real-Time Monitoring feed pressure.For the pressure drop of calculating each section, and then water production rate and salt transmitance are demarcated.5 μ m cartridge filters are installed into delivery gauge, (2bar) more renew cartridge in the time that pressure drop reaches certain value.Service pump inlet and outlet pressure table is used for monitoring service pump inlet and outlet pressure, and inlet and outlet pressure switch is used for low warning, termination of pumping in the time of intake pressure, (time delay, in case open the door and do not open slowly) warning, termination of pumping when top hole pressure is high;
(3) rate of flow meter
The product water rate of flow meter monitoring water production rate that is in operation, every cover should be installed separately, so that demarcate RO performance data.Product water flow has the several functions such as instantaneous instruction, accumulative total and record, and the concentrated water drainage water flowmeter monitoring water displacement that is in operation has instruction, accumulative total and writing function.Feed meter also can be used for the automatic adjusting of chemical feeding quantity;
(4) specific conductivity table
Electrical conductivity of water can be indicated, be recorded to feedwater conductivity table, product water specific conductivity table, and overload alarm can be set, from the ratio of desalinization of feedwater conductivity and the known RO of product water specific conductivity;
(5) chlorine residue table
Measure feedwater chlorine residue, there is instruction, record and overload alarm function, also can be used for the automatic adjusting of chemical feeding quantity;
(6) redox potential table
Eliminate the feedwater of chlorine residue through adding reductive agent and should install redox potential table.It has instruction, record and overload alarm function, simultaneously for the automatic adjusting of chemical feeding quantity.
Embodiment major equipment and operating parameter are as follows:
Design water temperature: 5 ~ 30 DEG C
Raw water quality: TDS668 mg/L, total hard 312 mg/L(are in CaCO3), COD13.12 mg/L
Source water hydraulic pressure: 0.30MPa
Reverse osmosis membrane model: Tao Shi BW30FR-400/34i
The reverse osmosis produced water yield: 75m
3/ h
The reverse osmosis rate of recovery: >=75%
Electronic anti-scaling device power: 800W.
This patent energy-saving and environmental protection, comprehensive save energy can reach 30%, saves chemical medicament expense use, there is no secondary pollution.