The invention provides an all-vanadium redox flow battery state-of-charge online monitoring method and system The monitoring method comprises the steps that the vanadium ion concentration value of each valence state in positive and negative electrode electrolyte in the battery charging and discharging process is acquired and open-circuit voltage is recorded; the state-of-charge of the positive and negative electrode electrolyte is calculated via the vanadium ion concentration value; a relation equation of open-circuit voltage and the corresponding state-of-charge is obtained according to the relational graph of the state-of-charge and open-circuit voltage through fitting; and the state-of-charge of the positive and negative electrode electrolyte of a battery to be measured is obtained according to the relation equation and current open-circuit voltage The relevant parameters of the positive and negative electrode electrolyte are acquired so that unnecessary error in the calculation process of the battery state-of-charge can be weakened and finally the state-of-charge of the battery electrolyte can be obtained through measurement According to the method, an existing open-circuit voltage method equation is corrected, and fitting of a negative electrode relation equation and a positive electrode relation equation is respectively performed so that the accurate state-of-charge of the positive and negative electrode electrolyte can be calculated

All-vanadium redox flow battery state-of-charge online monitoring method and system

The invention discloses a compound probe for monitoring corrosion of a down-hole string on line. The compound probe comprises a probe body, an electrical resistance probe, and an alternating current impedance probe, wherein the probe body is sleeved by a cylindrical shell; the electrical resistance probe comprises a sealing reference element and a sensitive element, which are in series connection, and materials of the sealing reference element and the sensitive element are the same as that of the down-hole string; the alternating current impedance probe comprises a reference electrode, a working electrode and an auxiliary electrode and forms an electrochemical three-electrode system. Corrosion allowance of the down-hole string is calculated by collecting terminal voltages of the reference element and the sensitive element of the electrical resistance probe; sine wave signals of different frequency points are loaded on the working electrode, and the polarization current of the auxiliary electrode and the polarization potential of the reference electrode are synchronously collected, so as to obtain the polarization resistance of the working resistance, and then the corrosion velocity can be measured. The invention further discloses a monitoring device with the probe and a monitoring method. According to the compound probe for monitoring the corrosion of the down-hole string on line, the monitoring device and the monitoring method, the quick on-line monitoring of the corrosion velocity of a down-hole oil gas sleeve or string can be realized; and the probe, the monitoring device and the monitoring method are suitable for an environment with any mixed medium of oil, water and gas in a down-hole high-temperature high-pressure environment.

Compound probe, device and method for monitoring corrosion of down-hole string on line and in real time

The invention discloses an electrochemical noise processing method for characterizing a corrosion speed. The method is used for acquisition and processing of high-frequency acquired electrochemical noise data, a three-electrode system is adopted to acquire the high-frequency electrochemical noise data, the optimal frequency is set to 78 Hz, and the problems of low selection and long consumed time of conventional frequency measurement are overcome. The stored high-frequency electrochemical noise data is processed by software according to wavelet analysis, and a wavelet noise resistance with the frequency closest to 2 Hz is selected to be compared with a noise resistance obtained from low-frequency information; a result proves that the wavelet noise resistance value obtained through wavelet decomposition of high-frequency noise information is consistent to the noise resistance value obtained from a low frequency, and shows that the wavelet noise resistance can also be used for responding electrochemical corrosion information in an atmospheric corrosion process and also has the advantages of short test time and large data size.

Electrochemical noise processing method for characterizing corrosion speed

The invention discloses an icing mold as well as a device and a method for measuring icing shear force thereby; the device comprises the icing mold, a test fixture, a lifting table, a pressure sensor, a pressure head and an electronic tension tester; the icing mold comprises a freezing mold, an icing test block, a freezing upper cover and a fastening device; the icing test block is coated with a coating layer to be measured; after the icing mold is used for injecting water and coating ice, the freezing upper cover and the fastening device are moved away, and the icing test block and the freezing mold frozen together are fixed on a measuring fixture; the pressure head is mounted on the pressure sensor; the pressure sensor is fixedly mounted on the lifting table, and is connected with the electronic tension tester for generating a pressure signal corresponding to pressure value when the freezing mold is pressed by the pressure head; the lifting table is connected with the electronic tension tester for driving the pressure head to press the freezing mold; when the freezing mold is displaced, pressure measured by the electronic tension tester is instantly decreased for stopping, and the maximal value in the variation of the measured value is recorded and displayed.

Icing mold as well as device and method for measuring icing shear force thereby

The invention discloses a test system for assessing the freeze resistance of a wind turbine blade coating The system comprises a phytotron capable of simulating icing environment and ice melting environment, a test bench is arranged in the phytotron, the test bench comprises a center rotating shaft, the center rotating shaft is fixedly connected with a plurality of connecting rods, the end portions of the connecting rods are used for installing coating test sample plates, the coating test sample plates respectively have an aerofoil profile consistent with a fan blade, and the coating test sample plates are uniformly arranged along the radial circumference with the shaft center of the center rotating shaft as a circle center; and the test system also comprises an icing sensor and a humidity sensor which are arranged on one of the coating test sample plates, and a weight sensor arranged on the center rotating shaft The invention also provides a test method for assessing the freeze resistance of the wind turbine blade coating by using the test system The system and the method have the advantages of low test investment cost, accurate and reliable test result, and comprehensive and real reflection of the performances of the freeze-resistant blade coating

Test system for assessing freeze resistance of wind turbine blade coating, and method thereof

The invention provides a method and system for detecting a corrosion state of a grounding grid. The method for detecting the corrosion state of the grounding grid comprises the steps that three-electrode system sensor is adopted to apply step currents to the detected grounding grid, and the step response signals of the detected grounding grid are collected; wavelet signal extraction is carried out on the step response signals to generate detection signals; reconstruction is carried out on the detection signals to generate smoothing response signals; whether the collected step response signals are effective or not is judged according to the reconstructed smoothing response signals; the step response signals are determined to be effective, and the neural network weight of the detected grounding grid is generated according to the detection signals and a Kohonen neural network model; the detection result of the corrosion state of the grounding grid is generated according to the neural network weight of the detected grounding grid and a pre-stored standard neural network weight. Fitting does not need to be carried out on obtained on-site detection electrochemical signals, a judgment result is directly obtained, and the method and system are suitable for a tester without checkout knowledge as well.

Method and system for detecting corrosion state of grounding grid

The utility model discloses a potential detection sensor including a graphite electrode, a reference electrode, an electrode pedestal, an electrode pedestal casing, a probe rod, a socket, a graphite electrode lead, and a reference electrode lead, wherein the electrode pedestal casing is sleeved on the electrode pedestal, one end of the graphite electrode lead is connected with the graphite electrode, the other end of the graphite electrode lead is connected to the socket through the electrode pedestal casing and the cavity in the probe rod, one end of the reference electrode lead is connected with the reference electrode, the other end of the reference electrode lead is connected to the socket through the electrode pedestal casing and the cavity in the probe rod, and the graphite electrode and the reference electrode are embedded into the electrode pedestal and are sealed by sealant to measure the electrode potential of the anode electrolyte or cathode electrolyte of an all vanadium redox flow battery(VRB). The potential detection sensor used for detecting the charged state of the electrolyte of the VRB is reasonable in design, convenient in operation, low in cost. By means of such a potential detection sensor, the SOC detection error is small and the detection is accurate; moreover, the potential detection sensor provided plays a guiding role in the maintenance and management work of the long-running vanadium pile electrolyte, thereby guaranteeing the safe and stable running of the pile.

Potential detection sensor

The embodiment of invention provides an ice coating test climate box which comprises a test box, an overlapping type refrigerating system connected with the test box, as well as a water refrigerating system, a spraying system and a wind speed regulating system, wherein the overlapping type refrigerating system is used for refrigerating for the test box; an evaporator in the water refrigerating system uses a condenser and a compressor in the overlapping type refrigerating system to generate cooling water which is conveyed to a first pipeline and a third pipeline, the cooling water in the first pipeline and the third pipeline and cold water in a cold water tank perform cooling capacity exchange, and a float valve realizes automatic water supplement to stabilize the temperature of super-cooled water during spraying; the spraying system comprises a water storage tank, the cold water tank, a water recovery tank, an air compressor, a booster pump, a water suction pump, a two-fluid nozzle and a single-fluid nozzle which are installed at the top of the test box; the wind speed regulating system which comprises a frequency conversion type centrifugal fan and a wind speed measuring instrument is arranged in a low-temperature test box, the frequency conversion type centrifugal fan is used for supplying wind force in the low-temperature test box, and the wind speed measuring instrument is used for measuring wind speed.

Ice coating test climate box

The invention discloses an SOC (State of Charge) detection method and system for a vanadium redox battery. The method comprises the following steps: measuring the positive potential of positive electrolyte and the negative potential of negative electrolyte of the vanadium redox battery; acquiring the positive potential and the negative potential, filtering and amplifying the positive potential and the negative potential, and converting the filtered and amplified positive potential and negative potential into a positive potential digital signal and a negative potential digital signal respectively; processing the positive potential digital signal and the negative potential digital signal to generate a positive SOC value and a negative SOC value respectively; displaying the positive SOC value and the negative SOC value. The SOC detection method and system for the vanadium redox battery in the embodiment of the invention are reasonable in design, are convenient in operation, are accurate in detection and are small in errors; guidance can be provided for the maintenance and management work of long-time-running vanadium electric pile electrolyte, and safe and stable running of an electric pile is ensured.

SOC (State of Charge) detection method and system for vanadium redox battery

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