Oil pipe heating skin electric heat tracing device special for oil field

Abstract

The invention relates to the technical field of oil field thick oil conveying pipeline electric heating, and discloses an oil pipe heating skin electric tracing device special for an oil field. The device comprises a power supply control cabinet and a skin heating pipe electrically connected with the power supply control cabinet, the modulation output circuit comprises a mains supply rectification filter circuit, a direct current frequency conversion voltage reduction isolation circuit, a secondary direct current frequency conversion modulation alternating current and direct current hybrid output circuit and a safe output control circuit, and 380V power electricity is converted into direct current high voltage electricity through the mains supply rectification filter circuit, and is rectified and filtered into low-voltage direct current through high-frequency switching tube control, the direct-current variable-frequency step-down isolation circuit and isolation conversion, and the low-voltage direct current is output through the secondary direct-current variable-frequency modulation alternating-current and direct-current hybrid output circuit; and an equipotential detection circuit controls output voltage and current to enable equipotential electric signals to be added into a next heating output period waveform, so that the equipotential difference is greatly eliminated under the condition that normal work of heating is not affected, and the pipeline is further protected against electrolytic corrosion caused by the equipotential difference.

Description

technical field [0001] The invention relates to the technical field of electric heating for heavy oil pipelines in oilfields, in particular to an electric skin tracing device for oilfield special-purpose oilpipe heating. Background technique [0002] The skin heating of existing pipelines and the heating technology of heating bands are heating methods that have been used in metal pipeline heating systems in recent years. [0003] Shortcomings of the existing electric heating technology route: For example, CN206439554U discloses a device that utilizes the skin effect to realize automatic heat tracing and unblocking of ground pipelines. Low (power supply is generally commercial power, there is a risk of electric shock); skin heating is divided into two parts: low-frequency skin heating has a large volume and weight, large thermal power consumption, low efficiency, and low safety factor (non-safe voltage power supply, there is a risk of electric shock) . refer to figure 1 . ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide oilfield special oil pipe heating skin electric heating device, including power control cabinet and skin heating pipe electrically connected with the power control cabinet, which can greatly reduce the equipotential difference of the heating pipe and effectively solve the problem of equipotential The electrolytic corrosion of metal pipelines caused by electrolytic corrosion can also ensure the safety of electricity, thereby solving the problems in the background technology

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