Full-automatic starting system and method for sintering waste heat recycling and sintering draught fan combined unit

Abstract

The invention discloses a full-automatic starting system for a sintering waste heat recycling and sintering draught fan combined unit. The full-automatic starting system comprises a double-output-shaft sintering draught fan, a motor, a variable-speed clutch, a steam turbine, an inlet pressure transmitter, a fast closing valve, a rotating speed sensor, a rotating speed PID controller and a pressure PID controller. A full-automatic starting method includes the steps that firstly, the sintering draught fan is started; secondly, after the sintering draught fan runs normally, pressure of inlet steam of the steam turbine is detected; and thirdly, the steam turbine is started, a PLC system controls the opening degree of a main throttle valve so as to control the rotating speed of the unit till the inlet steam of the steam turbine reaches a proper condition. The full-automatic starting system and method achieve full-automatic one-button starting of the whole unit, the safety in the unit starting process is guaranteed, the starting time of the whole unit is greatly shortened and is shortened from 120 min to 90 min, and mistaken operation and possible losses in the operating process of manual unit starting are avoided. Meanwhile, conditions are provided for enterprises to save the labor cost, and generated direct and indirect economic benefits are great.

Description

technical field [0001] The invention relates to energy recovery and utilization equipment in iron and steel metallurgical processes, in particular to a fully automatic start-up system and method for a sintering waste heat recovery and sintering fan combined unit. Background technique [0002] In the ironmaking process, the energy consumption of the sintering process accounts for more than 10% of the energy consumption per ton of steel, and the heat taken away by the waste gas discharged from the cooler is about 35% of the heat consumption of the sintering system. Make full use of this Part of the heat can significantly reduce the energy consumption of the sintering process, which accounts for about 12% of the total energy consumption of metallurgy, and is the second largest energy-consuming process after ironmaking. Generally, the average temperature of the sintering flue gas in the sintering plant is ≤150°C, and the temperature of the flue gas at the tail reaches 300°C to 4...

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Problems solved by technology

Separate investment in workshops and separate design of control systems is required, resulting in high investment costs

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