Oilfield special oil pipe heating skin electric heat tracing device

Abstract

The invention relates to the technical field of electric heating for heavy oil pipelines in oilfields, and discloses a skin electric heat tracing device for oil pipe heating specially used in oilfields, including a power control cabinet and a skin heating tube electrically connected to the power control cabinet, wherein the modulation output circuit includes a market Electric rectification filter circuit, DC frequency conversion step-down isolation circuit, secondary DC frequency conversion modulation AC-DC hybrid output circuit and safety output control circuit, 380V power is converted into DC high-voltage power through the mains rectification and filter circuit, controlled by high-frequency switch tube, The DC frequency conversion step-down isolation circuit and isolation conversion are rectified and filtered to low-voltage DC, and the low-voltage DC is output by the secondary DC frequency conversion modulation AC-DC hybrid output circuit; the equipotential detection circuit controls the output voltage and current so that the equipotential electrical signal is added to the next heating output In the periodic waveform, the equipotential difference is largely eliminated without affecting the normal operation of the heating itself, and the electrolytic corrosion of the pipeline caused by the equipotential difference is further protected.

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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