DC electric power system used for converter accident tilting, and oxygen sublance accident lifting

Abstract

The invention relates to a DC electrical source power system which is used for tilting converter accident and promoting oxygen sublance accident. The power system adopts an AC frequency conversion speed regulating device and is connected with a rectifier to convert the alternating current into direct current by a public DC bus; a plurality of inverters are hung under the DC bus and respectively drive motors connected with the inverters. A DC electrical source is connected with the DC bus of the inverters by a high-power diode. When the electrical source is normal, the DC electrical source does not discharge towards the DC bus; when the normal electrical source is in failure, the voltage of the DC bus is reduced to be lower than the design voltage of the DC electrical source, the diode is conducted, and the DC electrical source discharges towards the DC bus; when the voltage of the DC bus is maintained to be constant, the inverters still work normally, thus tilting converter accident and promoting oxygen sublance accident. The invention adopts the DC electrical source as a power source when the accidents happen, so as to simplify the mechanical design, lower the price and reduce the maintaining workload.

Description

technical field [0001] The invention relates to a converter in the metallurgical industry, in particular to a DC power supply power system for tilting the converter in an accident and lifting an oxygen sub-lance in an accident. Background technique [0002] At present, large and medium-sized converters at home and abroad have converter accident tilting and oxygen sub-lance accident lifting systems. The power used is mainly: [0003] 1. The hydraulic system is used for the accidental tilting of the converter, and the air motor is used for the lifting of the oxygen lance and auxiliary lance. [0004] 2. Pneumatic motors are used for the accidental tilting of the converter and the accidental lifting of the oxygen lance and auxiliary lance. [0005] The main disadvantages of these two power schemes are: [0006] 1. No matter what kind of power is used, the mechanical transmission gearbox for converter tilting and oxygen sub-lance lifting must adopt non-standard design, and the...

AI Technical Summary

Problems solved by technology

[0006] 1. No matter what kind of power is used, the mechanical transmission gearbox for the tilting of the converter and the lifting of the oxygen sub-lance must adopt a non-standard design, and the design and manufacture are more complicated

[0007] 2. Due to the negative torque that may be generated by the converter and the potential energy load characteristics of the oxygen sub-lance, when designing the hydraulic and pneumatic systems, hydraulic or pneumatic components must be used to achieve the following functions: first establish the torque when starting, and then open the brake , when stopping, first close the brake and then stop the hydraulic and pneumatic motor, so the design of the air circuit or hydraulic circuit is complicated, and many components are used, which is prone to failure

[0008] 3. If there are two converters, each converter should be designed with a hydraulic and pneumatic emergency system

[0009] 4. Hydraulic pumps, air motors and hydraulic and pneumatic components are expensive

[0010] 5. The hydraulic or pneumatic system must be tested regularly to ensure that it can work normally in an accident state. In this way, the workload of daily maintenance is heavy

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