Electrical system of polycrystalline silicon rod reduction furnace and its starting method

Abstract

The invention discloses an electrical system of a reduction furnace with polycrystalline silicon rods and a starting method of the reduction furnace with the polycrystalline silicon rods, and particularly relates to the starting method of the reduction furnace with the twenty-four pairs of polycrystalline silicon rods. The electrical system comprises the twenty-four pairs of polycrystalline silicon rods, wherein the four pairs of polycrystalline silicon rods are distributed on an inner ring, the eight pairs of polycrystalline silicon rods are distributed on a middle ring, and the twelve pairs of polycrystalline silicon rods are distributed on an outer ring; the twenty-four pairs of polycrystalline silicon rods are all connected with a power-adjusting-cabinet power source, the eight pairs of polycrystalline silicon rods distributed on the middle ring are further connected with a high-voltage starting power source through a middle-ring isolating switch, the four pairs of polycrystalline silicon rods distributed on the inner ring are further connected with four sets of thyristor modules, and each pair of polycrystalline silicon rods on the inner ring corresponds to a set of antiparallel thyristors. According to the method, after the middle ring is broken down through a high voltage, electricity is completely supplied by a normal power source, breakdown is conducted on the inner ring in an alternating mode under the baking action of the middle ring, and the outer ring is directly started under the baking action of the inner ring and the middle ring after the inner ring is broken down.

Description

technical field [0001] The invention relates to the electrical system structure of a polysilicon reduction furnace and its start-up method, in particular to the start-up method of a 24-pair polysilicon rod reduction furnace. Background technique [0002] At present, the domestic high-voltage start-up system generally starts all the silicon cores of the reduction furnace at high voltage. The breakdown of each group of silicon cores is controlled through the isolation cabinet and the switching cabinet. Switch to another group for breakdown. [0003] This solution not only requires a large number of isolation switching cabinets, but also the high voltage for breakdown and the lower voltage for normal operation will exist in the reduction furnace at the same time. If the silicon core falls during the breakdown process, silicon cores with different voltage levels will touch together , will cause serious damage to the equipment. [0004] On the other hand, total high voltage bre...

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Problems solved by technology

[0003] This solution not only requires a large number of isolation switching cabinets, but also the high voltage for breakdown and the lower voltage for normal operation will exist in the reduction furnace at the same time. , will cause serious damage to the equipment

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