SHRT unit frequency converter and steam turbine rotating speed synchronous automatic adjusting control method

Abstract

The invention discloses an SHRT unit frequency converter and steam turbine rotating speed synchronous automatic adjusting control method. The method comprises the steps that firstly, the rotating speed adjusting rate A is set in a frequency converter; secondly, the working condition is detected in real time, if a unit needs to be subjected to rotating speed rising running, the third step is executed, and if the unit needs to be subjected to rotating speed reduction running, the fourth step is executed; thirdly, the unit rotating speed decreasing running control is carried out, the frequency converter sends out a speed reduction preparing instruction to a DEH, a steam turbine is switched to the rotating speed adjusting mode from the power adjusting mode, after switching is finished, an instrument control system judges whether the unit meets the speed reduction condition, if the unit meets the speed reduction condition, the DEH feeds back the speed reduction allowing signal to the frequency converter, and after the frequency converter receives the allowing signal, the unit speed reduction adjusting is executed; fourthly, unit rotating speed increasing running control is carried out.According to the method, manual intervene is not needed, the problem that in the speed adjusting process, due to current fluctuation of an electric motor, the frequency converter fails and is shut down is solved, and meanwhile, the frequency converting adjusting SHRT unit generates the giant economic benefits for an enterprise.

Description

technical field [0001] The invention belongs to the technical field of waste heat power generation and is applied to energy recovery and utilization equipment in iron and steel metallurgical processes, in particular to a synchronous automatic adjustment control method for the frequency converter of an SHRT unit and the speed of a steam turbine. Background technique [0002] The energy consumption of my country's iron and steel industry accounts for 16.3% of the country's total energy consumption, and its energy consumption is mainly from the two sections of sintering and ironmaking, of which the sintering section accounts for 10-20%, second only to 70% of the ironmaking section, so optimizing sintering Process and power equipment systems are particularly important to achieve energy saving and emission reduction. The sintering main exhaust fan is a necessary active device in the sintering process, which is driven by a motor to supply air to the sintering system. The recovered...

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Problems solved by technology

[0004] At present, when the SHRT unit is in use, in the process of the motor 4 being adjusted by the frequency converter 7, take the speed reduction as an example to illustrate: During the speed reduction process, the motor 4 will bear a large reverse torque due to the work done by the steam turbine 1, resulting in The current of the motor 4 keeps decreasing, so that the motor 4 enters the power generation state (because the motor 4 stator speed is smaller than the rotor speed), the motor 4 reversely inputs electric energy to the grid through the frequency converter 7, and the ordinary two-quadrant frequency converter does not have reverse input In this case, the DC bus voltage of the inverter 7 continues to rise, and finally the fault trip of the inverter 7 causes the interlocking shutdown of the unit

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