CN102719828A - Constant-current intermittent cathodic protection and corrosion acceleration system and implementation method thereof - Google Patents
Constant-current intermittent cathodic protection and corrosion acceleration system and implementation method thereof Download PDFInfo
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Abstract
The invention relates to a constant-current rate intermittent cathodic protection and corrosion acceleration system and an implementation method thereof in the field of impressed current cathodic protection technologies and the experimental investigation thereof. The constant-current rate intermittent cathodic protection and corrosion acceleration system performs multiway constant-current output intermittent cathodic protection and corrosion acceleration functions, and a corrosion acceleration system and a cathodic protection system are provided with a common PWM (pulse-width modulation) constant-current control module and PWM single-ended converter. The constant-current rate intermittent cathodic protection and corrosion acceleration system conducts cathodic protection in a constant-current intermittent manner, so the cathodic protection cost is reduced; and meanwhile, the constant-current rate intermittent cathodic protection and corrosion acceleration system also performs a function of conducting corrosion acceleration at a constant-current rate, so the corrosion states of steel bars can be accurately predicted; the constant-current adjustable characteristic of the constant-current rate intermittent cathodic protection and corrosion acceleration system satisfies technological requirements of RC (reinforced concrete) structures with different numbers of steel bars and a impressed current cathodic protection and a common system module is used for providing the two functions, so the cost is saved.
Description
Technical field
Patent of the present invention relates to impressed current cathodic protection technology and experimental study field thereof, is specially a kind of constant current intermittently galvanic protection and accelerated corrosion system and its implementation.
Background technology
Saturated day by day along with China's transport development in recent decades, increasing old bridge, old harbour and old house architectural structure etc. suffer corrosion damaged because of adverse environment, need badly and carry out repairing and reinforcing and anticorrosion.At present,, promptly between reinforcing bar (as anode) and auxiliary cathode (like titanium net or copper mesh etc.), apply galvanic current, make Cl for research reinforced concrete structure erosion failure mechanisms often adopts the impressed current accelerated corrosion test
-1Gather on the quick anode of hazardous medium (reinforcing bar) surface, thereby destroy the passivation mask of reinforcing bar, concrete structure rust distending takes place then split and corrode breakage; If impose reversible circulation, then can make Cl
-1Toward the supplementary anode migration, the chloride ion content that reduces rebar surface is the migration of rebar surface with stoping extraneous cl ions to negative electrode, realizes the impressed current cathodic protection function then Deng harmful ion.Yet because the corrosion development causes the variation of loaded impedance, general voltage stabilized source can not be regulated in view of the above and kept the accelerated corrosion constant rate, is difficult to accurately predict steel bar corrosion state.Simultaneously; Increase along with the reinforcement corrosion degree; Reinforcing bar reaches the required current density of polar galvanic protection also to be increased thereupon, and general impressed current cathodic protection system does not also have identification to change because of the loaded impedance that corrosion potential factor such as shuffle causes, and when not needing impressed current, still carries out galvanic protection; Waste electric energy, reduced the economy and the safety of system.Promptly present this type systematic can not satisfy the demand of impressed current cathodic protection in reinforced concrete structure accelerated corrosion test and the antiseptic project.
Summary of the invention
The object of the invention; Overcoming existing accelerated corrosion test power-supply system exactly can not carry out accelerated corrosion and satisfy the deficiency that multichannel skeleton construction test specimen carries out accelerated corrosion test and galvanic protection demand simultaneously with constant rate of speed, discloses the galvanic protection of a kind of continuous current intermittent type and accelerated corrosion system and its implementation.
In order to achieve the above object, adopt following technical scheme:
Galvanic protection of a kind of continuous current intermittent type and accelerated corrosion system; Comprise galvanic protection circuit that automatic identification loaded impedance changes and the maintenance constant current is intermittently exported and the accelerated corrosion circuit that the identification loaded impedance changes and the maintenance constant current is exported automatically; Said accelerated corrosion circuit and galvanic protection circuit are provided with shared width modulation single-ended converter and PWM constant current control module, and accelerated corrosion circuit and galvanic protection circuit switch through handover module.
Further, said width modulation single-ended converter comprises high-frequency output transformer, switch adjustable pipe, sampling feedback resistance and driving circuit; Said driving circuit drives switch adjustable pipe output high-power high-frequency electric current; The high-frequency output transformer that is connected with the switch adjustable pipe connects more than one secondary acquisition low pressure high-frequency current more than a tunnel, and said sampling feedback resistance is used to gather the low-tension current after rectification of high-frequency output transformer output and provide to PWM constant current control module.
Further; Said PWM constant current control module comprises negative-feedback amplifier, pulse width modulator and current regulator; Current regulator connects the input terminus of negative-feedback amplifier; The negative-feedback amplifier output terminal connects pulse width modulator, through the dutycycle that pulse width modulator is regulated the switch adjustable pipe of width modulation single-ended converter, exports adjustable constant current.
Further, said accelerated corrosion circuit also comprises PWM constant current control module and accelerated corrosion load blocks, and said accelerated corrosion load blocks one end connects the member that is corroded, and the other end connects the width modulation single-ended converter.
Further, said being corroded also is provided with commutation diode, high frequency filter and the three-terminal regulator block that is connected in series between member and the width modulation single-ended converter.
Further; The galvanic protection circuit that said electric current is intermittently exported also comprises galvanic protection reference electrode control of Electric potentials module; It comprises the protection potential setter that is used to set the protection potential upper limit, is used for the hysteresis positive regeeration comparer of comparison reference electrode current potential and protection potential size, is used to set the reference electrode variation range setter of protection potential lower limit and the optical coupler that is connected with hysteresis positive regeeration comparator output terminal; Said protection potential setter is connected hysteresis positive regeeration comparer with reference electrode variation range setter; Through control optical coupler conducting or end, further control PWM constant current control module; The galvanic protection load blocks, the one of which end connects anode, and an end connects the width modulation single-ended converter, is provided with the commutation diode, high frequency filter and the three-terminal regulator block that are connected in series between the two ends.
The implementation method of galvanic protection of a kind of continuous current intermittent type and accelerated corrosion system comprises that the function handover module switches to the accelerated corrosion circuit, and PWM constant current control module is regulated the dutycycle of the switch adjustable pipe of width modulation single-ended converter, exports adjustable constant current; The function handover module switches to the galvanic protection circuit, and galvanic protection reference electrode control of Electric potentials module is through current regulator control PWM constant current control module, and then control width modulation single-ended converter output intermittent current.
Further, the negative-feedback amplifier of said PWM constant current control module obtains current feedback signal to its inverting input from sampling feedback resistance; The dutycycle of the output terminal control pulse width modulator of negative-feedback amplifier, the on-off time ratio of regulating the switch adjustable pipe of width modulation single-ended converter obtains adjustable constant-flow output; The high-frequency output transformer of width modulation single-ended converter connects the accelerated corrosion load blocks and obtains the low pressure high-frequency current; The low pressure high-frequency current again through three-terminal regulator block, the high frequency filter that is connected in series successively, the member that is corroded more than, obtains dc low-voltage constant current output more than one tunnel through after the rectifies.
Further, during energized, the optical coupler conducting of galvanic protection reference electrode control of Electric potentials module, the dutycycle of pulse width modulator raises, and the constant current output of switch adjustable pipe increases, and the reference electrode current potential slowly rises; The reference electrode current potential rises and surpasses the protection potential upper limit that the protection potential setter is set, hysteresis positive regeeration comparator toggles; After the hysteresis positive regeeration comparator toggles, not conducting of optical coupler, triode is saturated, and the dutycycle of pulse width modulator is minimum, and the constant current output of switch adjustable pipe is near zero, and the reference electrode current potential slowly descends; The reference electrode current potential drops to the protection potential lower limit that reference variation range setter is set, and hysteresis positive regeeration comparer overturns once more, the state when energized is arrived in the module recovery of galvanic protection reference electrode control of Electric potentials.
Compared with prior art, beneficial effect of the present invention is:
(1) connects a plurality of secondary acquisition multichannel low pressure high-frequency currents outputs through the on-off time ratio of change switch adjustable pipe and at high-frequency output transformer; Between commutation diode and load, increase three-terminal regulator block and high frequency filter, thereby realize the adjustable Constant Direct Current output of multichannel.Can be used for reinforced concrete structure is carried out the constant rate of speed accelerated corrosion test, the steel bar corrosion of concrete structure is damaged under the simulating natural environment, and the reduction test period can be predicted steel bar corrosion state more accurately, easily.
(2) through adopting hysteresis positive regeeration voltage comparator as potentiometric controller, the switch signal of its output control PWM input terminus changes its output state, can realize the output at intermittence of galvanic protection impressed current.Be used under corrosive environment, applying extra electric field reinforced concrete structure is carried out galvanic protection, thereby the galvanic corrosion that makes electronic migration cause is inhibited, structure is avoided or weakened corrosive and take place.
(3) the best comparison point current potential of confirming by shop experiment and the width of only hysteresis positive regeeration comparer characteristic; Can make system in continuous intermittently power-on process; The variation of reference potential is all within the scope of galvanic protection; And the time sufficiently long of outage, thereby save electric energy to greatest extent than switching on continuously.Outward current is regulated on a large scale and open circuit voltage is controlled according to on-the-spot needs, this adjusting is economical for obtaining under the different field conditions, effectively galvanic protection is absolutely necessary.
Description of drawings
Fig. 1 is the system chart of continuous current intermittent type of the present invention galvanic protection and accelerated corrosion system;
Fig. 2 is the concrete module frame chart of continuous current intermittent type of the present invention galvanic protection and accelerated corrosion system;
Fig. 3 is a width modulation single-ended converter schematic circuit of the present invention;
Fig. 4 is a PWM constant current control module schematic circuit of the present invention;
Fig. 5 is a galvanic protection reference electrode control of Electric potentials module circuit diagram of the present invention.
Diagram: 1-accelerated corrosion circuit; 11-accelerated corrosion load blocks;
2-galvanic protection circuit; 21-galvanic protection reference electrode control of Electric potentials module; 22-galvanic protection load blocks;
The 3-common circuit; 31-width modulation single-ended converter; 32PWM constant current control module;
The 4-handover module.
Embodiment
As shown in Figure 1, Fig. 1 is a structural representation of the present invention.The present invention mainly comprises galvanic protection circuit 2 that automatic identification loaded impedance changes and keep constant current and intermittently export, discern loaded impedance automatically changes and keeps the accelerated corrosion circuit 1 of constant current output and the handover module 4 that two circuit switch.Wherein both are provided with common circuit 3.Common circuit 3 comprises width modulation single-ended converter 31 (invertor) and PWM constant current control module 32.
Like Fig. 1, shown in Figure 2, the automatic identification loaded impedance of present embodiment changes and keeps the accelerated corrosion circuit 1 of constant current output mainly to comprise accelerated corrosion load blocks 11, width modulation single-ended converter 31 and PWM constant current control module 32.The galvanic protection circuit 2 that electric current is intermittently exported mainly comprises width modulation single-ended converter 31, galvanic protection reference electrode control of Electric potentials module 21 circuit and galvanic protection load blocks 22.Width modulation single-ended converter 31 provides driving power for PWM constant current control module 32 and galvanic protection reference electrode control of Electric potentials module 21.Among Fig. 2, galvanic protection reference electrode control of Electric potentials module 21 is connected through handover module 4 with PWM constant current control module 32.Galvanic protection reference electrode control of Electric potentials module 21 mainly comprises follower, magnifying glass, hysteresis positive regeeration comparer and the optical coupler that connects successively, also is provided with reference electrode variation range setter and protection potential setter.Said reference electrode variation range setter, protection potential setter are connected with hysteresis positive regeeration comparer respectively.Reference electrode variation range setter is regulated the lower limit of protection potential, and the protection potential setter is regulated the upper limit of protection potential.
As shown in Figure 3, the high-frequency and high-voltage part of width modulation single-ended converter 31 is by the switch adjustable pipe, and high-frequency output transformer T2 and driving circuit are formed.Wherein the switch adjustable pipe is made up of the semiconductor power device IGBT pipe BG14, BG15, BG16, the BG17 that adopt voltage-controlled type, and driving circuit is made up of triode BG10, BG11, BG12, BG13.Driving circuit BG10, BG11, BG12, BG13 obtain input signal through input transformer T1 from pulse width modulator IC1; Driving switch adjustable pipe BG14, BG15, BG16, BG17; High-frequency output transformer T2 just obtains high-power high-frequency output; The secondary main winding output low pressure high-frequency current of high-frequency output transformer T2, after commutation diode D27, D28 rectification, main load obtains the high-power constant current of needs.High-frequency output transformer T2 can be provided with a plurality of secondary.Said secondary accelerated corrosion load blocks and the galvanic protection load blocks of comprising.The accelerated corrosion load blocks comprises concentric line (anode), and said concentric line is copper mesh or titanium net.Accelerated corrosion load blocks one end connects the member that is corroded more than, and the said member that is corroded is a reinforcing bar; The other end connects the width modulation single-ended converter.So just can obtain low-tension current output more than one tunnel.The galvanic protection load blocks comprises that by protection member (negative electrode) said is reinforcing bar by the protection member.Galvanic protection load blocks one end connects an above anode, and said anode is copper mesh or titanium net; The other end connects the width modulation single-ended converter.Commutation diode, three-terminal regulator block and the high frequency filter that is connected in series is set respectively between width modulation single-ended converter and the member that is corroded, anode.
As shown in Figure 4, negative-feedback amplifier IC2, sampling feedback resistance W8 (Fig. 3) and pulse width modulator IC1 form constant-current control circuit.Foregoing circuit is used for the high-precision high-power constant current output closed-loop reverse feedback control of accelerated corrosion circuit and galvanic protection circuit.Sampling feedback resistance W8 is located at the output terminal of high-frequency output transformer T2, gathers the low-tension current behind diode rectification of high-frequency output transformer output.Current potential of in-phase input end through given negative-feedback amplifier IC2; The inverting input of negative-feedback amplifier IC2 obtains electric current (current source loads electric current) negative-feedback signal from sampling feedback resistance W8; Negative-feedback amplifier IC2 output terminal is through the dutycycle of control pulse width modulator IC1; Load is obtained with the corresponding to steady current of the given current potential corresponding current of negative-feedback amplifier IC2 in-phase input end, thereby realize constant current output.The constant current size of output is then regulated pulse width modulator IC1 through the given current potential that changes negative-feedback amplifier IC2 in-phase input end; Thereby change the on-off time ratio (dutycycle) of switch adjustable pipe; On-off time ratio is bigger, and (ON time is big more; Turn-off time is few more), outward current is then big more; Switching time more little (ON time is more little, and the turn-off time is big more), outward current is then more little.And the given voltage of the in-phase input end of negative-feedback amplifier IC2 is to be regulated by current setting potentiometer W1; When the given voltage of in-phase input end of negative-feedback amplifier IC2 big more; Then negative-feedback amplifier IC2 output end voltage is big more, thereby makes the duty cycle square wave of pulse width modulator IC1 output big more; Otherwise the given voltage of the in-phase input end of negative-feedback amplifier IC2 is more little, and then negative-feedback amplifier IC2 output end voltage is more little, makes the duty cycle square wave of pulse width modulator IC1 output more little, thereby realizes the high-power output of constant-source with adjustable.The switch adjustable pipe adopts the semiconductor power device IGBT pipe of voltage-controlled type.IGBT pipe BG14, BG15, BG16, BG17 form switch adjustable pipe circuit, realize the constant current switch adjusting.Open circuit voltage potentiometer W2 is connected with the in-phase input end of pulse width modulator IC1; The given voltage of in-phase input end of pulse width modulator IC1 can be changed easily through regulating open circuit voltage potentiometer W2, thereby the constant current source open circuit voltage can be changed within the specific limits.Width modulation single-ended converter and PWM constant current control module be the impedance variations of identification accelerated corrosion circuit and galvanic protection circuit master load automatically; Accelerated corrosion circuit output circuit and galvanic protection circuit outward current are because the effect of feedback can both keep constant current output all the time.
As shown in Figure 5, galvanic protection reference electrode control of Electric potentials module 21 is mainly by triode BG9, bridge rectifier IC8, hysteresis positive regeeration comparer IC6A, and optical coupler IC7, reference electrode variation range setter W7 and protection potential setter W6 form.Set protection potential lower limit, the protection potential upper limit respectively through reference electrode variation range setter W7, protection potential setter W6.The protection potential upper and lower bound has constituted lagging width.Magnifying glass IC6B output terminal is connected to the reverse input end of hysteresis positive regeeration comparer IC6A through resistance R 33, and the adjustable end of protection potential setter W6 is connected to the input terminus in the same way of hysteresis positive regeeration comparer IC6A through resistance R 47.Receive the output terminal of hysteresis positive regeeration comparer IC6A behind the adjustable end of reference electrode variation range setter W7 and the end short circuit respectively through resistance R 50, resistance R 49 is connected to the input terminus in the same way of comparer IC6A.The reference potential of reference electrode is through connector J5, follower IC6C, magnifying glass IC6B, reference variation range setter W7, protection potential setter W6; Hysteresis positive regeeration comparer IC6A control optical coupler IC7; Thereby the conducting of control triode BG9 perhaps ends, and then control PWM constant current control module circuit.The switching of galvanic protection circuit and accelerated corrosion circuit mainly realizes through the triode BG9 of handover module.Through the working order of control triode BG9, and KS K as shown in Figure 5, realize the switching of two circuit.
After the energized, the reference electrode current potential slowly rises, in case rise to the protection potential upper limit of setting above the protection potential setter, hysteresis positive regeeration comparer IC6A upset.IC6A overturns when hysteresis positive regeeration comparer, not conducting of optical coupler IC7, and triode BG9 is saturated.Triode BG9 is connected with PWM constant current control module 11, makes the current setting vanishing of switch adjustable pipe.At this moment, the dutycycle of pulse width modulator IC1 is minimum, makes electric current output near zero through switch adjustable pipe BG14, BG15, BG16, BG17.Subsequently, the reference electrode current potential slowly descends, and drops at the reference electrode current potential before the protection potential lower limit of reference electrode variation range setter setting, and steel structure still receives galvanic protection, is not corroded.In case the reference electrode current potential drops to the protection potential lower limit that the back width adjustor is set, hysteresis positive regeeration comparer IC6A then overturns once more, and whole galvanic protection reference electrode control of Electric potentials module 21 circuit return to the original state that rigidly connects energize.The loaded work piece that is the galvanic protection circuit is in continuous intermittently power-on process, and the variation of reference electrode current potential is all within the bound scope of protection potential.The constant current of this galvanic protection circuit output intermittent type.Its after detecting the reference electrode current potential and dropping to the protection potential lower limit, galvanic protection circuit output constant current; The reference electrode current potential rises above after the protection potential upper limit, and the galvanic protection circuit quits work.Compare with the galvanic protection circuit that keeps constant potential, this galvanic protection circuit is more energy-conservation.
The present invention makes the electrochemical anti-corrosive technology in the civil structure have the variation of loaded impedance in automatic identification galvanic protection and the accelerated corrosion circuit, keeps the constant rate of speed of accelerated corrosion and galvanic protection.
Claims (9)
1. continuous current intermittent type galvanic protection and accelerated corrosion system; It is characterized in that: comprise galvanic protection circuit that automatic identification loaded impedance changes and the maintenance constant current is intermittently exported and the accelerated corrosion circuit that the identification loaded impedance changes and the maintenance constant current is exported automatically; Said accelerated corrosion circuit and galvanic protection circuit are provided with shared width modulation single-ended converter and PWM constant current control module, and accelerated corrosion circuit and galvanic protection circuit switch through handover module.
2. continuous current intermittent type according to claim 1 galvanic protection and accelerated corrosion system is characterized in that: said width modulation single-ended converter comprises high-frequency output transformer, switch adjustable pipe, sampling feedback resistance and driving circuit; Said driving circuit drives switch adjustable pipe output high-power high-frequency electric current; The high-frequency output transformer that is connected with the switch adjustable pipe is provided with more than one secondary acquisition low pressure high-frequency current more than a tunnel, and said sampling feedback resistance is used to gather the low-tension current after rectification of high-frequency output transformer output and feed back to PWM constant current control module.
3. continuous current intermittent type according to claim 1 galvanic protection and accelerated corrosion system; It is characterized in that: said PWM constant current control module comprises negative-feedback amplifier, pulse width modulator and current regulator; Current regulator connects the input terminus of negative-feedback amplifier; The negative-feedback amplifier output terminal connects pulse width modulator, through the dutycycle that pulse width modulator is regulated the switch adjustable pipe of width modulation single-ended converter, exports adjustable constant current.
4. continuous current intermittent type according to claim 1 galvanic protection and accelerated corrosion system; It is characterized in that: said accelerated corrosion circuit also comprises PWM constant current control module and accelerated corrosion load blocks; Said accelerated corrosion load blocks one end connects the member that is corroded, and the other end connects the width modulation single-ended converter.
5. continuous current intermittent type according to claim 4 galvanic protection and accelerated corrosion system is characterized in that: said being corroded also is provided with commutation diode, high frequency filter and the three-terminal regulator block that is connected in series between member and the width modulation single-ended converter.
6. continuous current intermittent type according to claim 1 galvanic protection and accelerated corrosion system is characterized in that the galvanic protection circuit that said electric current is intermittently exported also comprises:
Galvanic protection reference electrode control of Electric potentials module; It comprises the protection potential setter that is used to set the protection potential upper limit, is used for the hysteresis positive regeeration comparer of comparison reference electrode current potential and protection potential size, is used to set the reference electrode variation range setter of protection potential lower limit and the optical coupler that is connected with hysteresis positive regeeration comparator output terminal; Said protection potential setter is connected hysteresis positive regeeration comparer with reference electrode variation range setter; Through control optical coupler conducting or end, further control PWM constant current control module;
The galvanic protection load blocks, the one of which end connects anode, and an end connects the width modulation single-ended converter, is provided with the commutation diode, high frequency filter and the three-terminal regulator block that are connected in series between the two ends.
7. according to the implementation method of claim 1-6 arbitrary described continuous current intermittent type galvanic protection and accelerated corrosion system, it is characterized in that:
The function handover module switches to the accelerated corrosion circuit, and PWM constant current control module is regulated the dutycycle of the switch adjustable pipe of width modulation single-ended converter, exports adjustable constant current;
The function handover module switches to the galvanic protection circuit, and galvanic protection reference electrode control of Electric potentials module is through current regulator control PWM constant current control module, and then control width modulation single-ended converter output intermittent current.
8. implementation method according to claim 7 is characterized in that:
The negative-feedback amplifier of said PWM constant current control module obtains current feedback signal to its inverting input from sampling feedback resistance;
The dutycycle of the output terminal control pulse width modulator of negative-feedback amplifier, the on-off time ratio of regulating the switch adjustable pipe of width modulation single-ended converter obtains adjustable constant-flow output;
The high-frequency output transformer of width modulation single-ended converter connects the accelerated corrosion load blocks and obtains the low pressure high-frequency current;
The low pressure high-frequency current again through three-terminal regulator block, the high frequency filter that is connected in series successively, the member that is corroded more than, obtains dc low-voltage constant current output more than one tunnel through after the rectifies.
9. implementation method according to claim 7 is characterized in that:
During energized, the optical coupler conducting of galvanic protection reference electrode control of Electric potentials module, the dutycycle of pulse width modulator raises, and the constant current output of switch adjustable pipe increases, and the reference electrode current potential slowly rises;
The reference electrode current potential rises and surpasses the protection potential upper limit that the protection potential setter is set, hysteresis positive regeeration comparator toggles; After the hysteresis positive regeeration comparator toggles, not conducting of optical coupler, triode is saturated, and the dutycycle of pulse width modulator is minimum, and the constant current output of switch adjustable pipe is near zero, and the reference electrode current potential slowly descends;
The reference electrode current potential drops to the protection potential lower limit that reference variation range setter is set, and hysteresis positive regeeration comparer overturns once more, the state when energized is arrived in the module recovery of galvanic protection reference electrode control of Electric potentials.
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| CN109187325A (en) * | 2018-10-18 | 2019-01-11 | 中国水利水电科学研究院 | The speeding-up simulation experimental provision and method of PCCP pipe corrosion fracture process |
| CN109187325B (en) * | 2018-10-18 | 2020-07-28 | 中国水利水电科学研究院 | Accelerated simulation experiment device and method for corrosion fracture process of PCCP (prestressed concrete cylinder pipe) |
| CN109185537A (en) * | 2018-10-24 | 2019-01-11 | 安徽锐视光电技术有限公司 | A kind of high-speed electromagnetic valve driving protection system |
| CN113311234A (en) * | 2021-05-28 | 2021-08-27 | 哈尔滨工业大学（深圳） | Reinforcing bar corrosion sensing device |
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