CN-122010243-A - Synergistic protection technology for corrosion and scale inhibition of metal surface

CN122010243ACN 122010243 ACN122010243 ACN 122010243ACN-122010243-A

Abstract

The invention relates to the technical field of general dirt physical prevention and removal and surface cleaning, and discloses a metal surface corrosion and dirt inhibition cooperative protection process, which comprises the following steps: the method comprises the steps of collecting a current feedback signal of an electric heating load in a power modulation period in real time, calculating an energy fluctuation value of power spectral density in the signal, determining a frequency compensation quantity of an electric energy conversion circuit according to an offset quantity of the fluctuation value relative to a reference, controlling the electric energy conversion circuit to output periodic pulse current with a preset rising edge slope to the electric heating load so as to generate an unsteady thermal gradient on the surface of the load and excite micro-turbulence shearing force, and synchronously driving a potential opposite flushing circuit to apply voltage pulses with the same polarity as scale ions in a power rising section of the pulse current to construct a directional repulsive field.

Inventors

SUN ZICUN
MAO ZHONGDONG
FENG XUEXIN
LI CONGMING

Assignees

甘肃金昌化学工业集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260310

Claims (9)

1. The cooperative protection process for corrosion and scale inhibition of the metal surface is characterized by comprising the following steps of: step S101, obtaining an instantaneous current feedback signal output to an electric heating load by an electric energy conversion circuit in real time; Step S102, discrete sampling is carried out on the instantaneous current feedback signal to calculate a broadband energy fluctuation value of the power spectrum density of the instantaneous current feedback signal, and the output frequency compensation quantity of the electric energy conversion circuit is calculated in real time based on the deviation degree of the broadband energy fluctuation value relative to a preset reference so as to form a closed-loop power supply power modulation rule; step S103, driving an electric energy conversion circuit to output periodic pulse current with a preset rising edge slope to an electric heating load according to a power supply modulation rule, and inducing an unsteady thermal gradient on the surface of the electric heating load so as to excite spontaneous buoyancy plumes with microscopic shearing force; step S104, monitoring the phase state of the periodic pulse current, and applying voltage pulse to the electric heating load by the synchronous driving potential hedging circuit in a time sequence interval corresponding to the power rising section of the periodic pulse current so as to construct a directional repulsive field for the scale precursor ions on the surface of the electric heating load, and inhibiting heterogeneous nucleation of the scale precursor ions on the surface of the electric heating load through time sequence overlapping of physical thermal expansion disturbance and coulomb repulsive force.
2. The process according to claim 1, wherein in step S103, the preset rising edge slope is defined such that the electric heating load completes the transition of the output power from the initial power to the peak power within 5ms to 15ms, the modulation frequency of the periodic pulse current is set to 10Hz to 500Hz, and in step S104, the start time of the voltage pulse lags behind the rising edge start point of the periodic pulse current by 10 μs to 50 μs.
3. The cooperative protection process for corrosion and scale inhibition on a metal surface according to claim 1, wherein in step S101, the instantaneous current feedback signal is obtained by applying a detection narrow pulse to an electric heating load in a power off gap of a periodic pulse current, collecting a feedback voltage sequence generated by the electric heating load in response to the detection narrow pulse, and calculating an equivalent damping parameter representing a thermal resistance state of an interface of the electric heating load.
4. The process according to claim 1, wherein in step S102, the output frequency of the periodic pulse current is Dynamic correction is performed following the following rules: , wherein, Is the corrected output frequency; Beta is a preset frequency adjusting operator, delta E is the real-time change amount of the broadband energy fluctuation value; is a preset standard spectral energy reference value.
5. The process according to claim 1, wherein in step S104, the peak voltage of the voltage pulse is non-linearly compensated according to the fluid flow rate of the environment where the electric heating load is located, and when the fluid flow rate is monitored to decrease, the intensity of the directional repulsive field is increased by increasing the amplitude of the voltage pulse, so as to compensate the risk of ion deposition in the dead zone of the flow channel due to the increase of diffusion resistance.
6. A process for the synergistic protection of metal surfaces against corrosion and scale inhibition according to claim 1, wherein the pulse width of the voltage pulses is defined to be 2% to 8% of the period of the periodic pulse current and the potential polarity of the voltage pulses is set to be the same as the charge polarity of the scale ions in the fluid to be treated inside the electrically heated load.
7. The process for collaborative protection against corrosion and scale inhibition on a metal surface according to claim 1, further comprising step S105, switching the electric energy conversion circuit into a polarization mode during a standby period when the electric heating load is in a non-heating state, outputting a constant current lower than a hydrogen evolution potential to the electric heating load, outputting a low-frequency maintenance potential by the potential hedging circuit during a maintenance period of the constant current, and constructing a dynamic electrochemical passivation environment on the surface of the electric heating load.
8. The process according to claim 1, wherein the electric heating load comprises a plurality of heating branches configured in parallel, and in step S103, periodic pressure pulsation is induced in the heat exchange container by adjusting a delay phase of pulse output between the plurality of heating branches, and stripping efficiency of the spontaneous buoyancy plume to the attached matter on the surface of the electric heating load is enhanced by the pressure pulsation.
9. The process according to claim 1, wherein the step S102 is performed to extract the broadband energy fluctuation value by performing fast Fourier transform on the instantaneous current feedback signal to obtain a characteristic power spectrum in a frequency range from 1kHz to 10kHz, calculating an energy integration value of the characteristic power spectrum, and determining the time-dependent variation of the energy integration value as a characteristic parameter reflecting the thickness of the interface scale layer.

Description

Synergistic protection technology for corrosion and scale inhibition of metal surface Technical Field The invention belongs to the technical field of general dirt physical prevention and removal and surface cleaning, and particularly relates to a metal surface corrosion and dirt inhibition cooperative protection process. Background In the prior art, in a surface maintenance and scale inhibition prevention system of an industrial heating system, the continuity and stability of the substance exchange of a heating interface are ensured as the basic criteria of an electric power regulation loop, a conventional scheme adopts a steady-state control logic, constant power is output to a heating component to maintain the heat exchange efficiency of a heat exchange interface, the power supply mode ensures the stable operation of the heating system, but when impurity-containing fluid is treated, the adhesion of sediment on the surface is difficult to actively inhibit, but when hypersalinity fluid is treated, a relatively static thermal boundary layer is generated between a heating wall surface and a main fluid in a physical sense, due to the lack of effective energy intervention, solute crystal nuclei quickly reach a supersaturated state in the thermal boundary layer and are anchored on the surface of a heating pipe, meanwhile, the constant potential distribution enables the heating pipe matrix to generate electrochemical polarization, local pitting is induced in a high-temperature environment, chemical agents are commonly used in the industry or the way of improving the flow rate of the fluid is interfered, but the mode can introduce environmental pollution or increase the electric energy loss of the system, in addition, the external mechanical vibration or the ultrasonic component can increase the complexity of the power distribution system, the maintenance difficulty of the system is improved, analysis is difficult to realize on the condition that the existing scheme can realize the realization of sensing the characteristic of the deposition and the self-protection state of the heating interface by utilizing the electric power of the heating loop under the premise of not changing the physical flow channel structure. The utility model discloses a direct current injection type leakage furnace alarm device, wherein a control logic is provided with a perception dead zone, for example, the utility model patent with an authorized publication number of CN207797725U discloses a leakage furnace state judging method by utilizing a buried probe matched with a voltage separation circuit, the monitoring is of a focus safety guarantee, the signal analysis dimension is single, only macroscopic abnormality of circuit topology is identified, microscopic dynamic change of interface thermal resistance can not be captured, an injected static direct current signal is easy to be interfered by system background charge, feedback guidance is difficult to provide at the initial stage of scale deposition, multi-field energy opposite flushing can not be generated by a power modulation loop in a linkage manner, the prior art mainly has the defects that 1, the power output mode is single, the physical state of a boundary layer can not be actively interfered in the electric energy transmission process, 2, the interface potential distribution is lack of dynamic regulation, electrochemical polarization corrosion in the heat exchange process is difficult to be effectively inhibited, and 3, the power regulation process lacks perception feedback for scale inhibition risks, so that energy utilization efficiency and protection energy efficiency can not be considered. Therefore, how to induce interface to generate micro turbulence by modulating the electric energy output curve and realize closed-loop adjustment of protection intensity by utilizing the electric feedback characteristic becomes the technical problem to be solved by the invention. Disclosure of Invention The invention provides a cooperative protection process for corrosion and scale inhibition of a metal surface, which comprises the following steps: step S101, obtaining an instantaneous current feedback signal output to an electric heating load by an electric energy conversion circuit in real time; Step S102, discrete sampling is carried out on the instantaneous current feedback signal to calculate a broadband energy fluctuation value of the power spectrum density of the instantaneous current feedback signal, and the output frequency compensation quantity of the electric energy conversion circuit is calculated in real time based on the deviation degree of the broadband energy fluctuation value relative to a preset reference so as to form a closed-loop power supply power modulation rule; step S103, driving an electric energy conversion circuit to output periodic pulse current with a preset rising edge slope to an electric heating load according to a power supply modulation rule, and inducing