Energy-saving automatic control device of cloth-bag dust removal system and control method for blast furnace dust removal

Abstract

The invention provides an energy-saving automatic control device of a cloth-bag dust removal system and a control method for blast furnace dust removal. The energy-saving automatic control device comprises an input unit, a variable frequency drive unit, an execution unit and a PLC (programmable logic controller) control unit, wherein the input unit is composed of a fast acting fuse, a contactor and an electric reactor; the variable frequency drive unit consists of a rectification module and a capacitor, together with a braking unit, an inverter, a CPU (central processing unit) with a vector control function and a 220V power supply; the execution unit is composed of an electric reactor, a throttle rotary actuator and a throttle control device; the PLC control unit is composed of a PLC and an auxiliary circuit; the primary side of the rectification module of the variable frequency drive unit is connected with an output end of the electric reactor of the input unit and the secondary side of the rectification module is connected with the electric reactor of the execution unit through the capacitor and the inverter; the rectification module and the inverter are connected with the CPU through a bus, the CPU and the PLC are connected in a communication manner through a switching value and an analog quantity, and a throttle control end of the PLC unit is connected with the execution unit. Meanwhile, the device is used for controlling the blast furnace dust removal. By adopting the energy-saving automatic control device and the control method provided by the invention, the fan utilization can be improved, the accuracy control on the dust removal can be realized, the electric energy can be saved, heat productivity of the device can be reduced, the dust recovery rate can be improved, the cloth-bag damage rate can be reduced, and exhaust gas and dust emissions can be decreased.

Description

technical field [0001] The invention relates to a metallurgical industry automatic control technology applied in the field of environmental protection, in particular to an energy-saving automatic control device for a bag dust removal system and a control method for blast furnace dust removal. Background technique [0002] With the rapid development of our country's social economy, environmental and energy issues have become increasingly prominent, and we are currently facing a difficult task of energy conservation and emission reduction. [0003] Nowadays, there are many deficiencies in the bag dust removal system in many fields such as iron and steel, nonferrous metallurgy, chemical industry, machinery, building materials, electric power, light industry, textile, food, transportation, etc., especially the blast furnace dust removal system, which has unsatisfactory energy-saving and environmental protection effects. Only larger particles can be filtered out, and the air stil...

AI Technical Summary

Problems solved by technology

Dust also has a direct impact on equipment, shortening the service life of electrical appliances, machinery and other equipment; iron dust cannot be effectively recycled, and energy is wasted seriously

[0004] In addition, at present, most of the dust removal fans in our country operate in the state of non-regulation for many years. If the motor is operated at industrial frequency, the air volume is adjusted by adjusting the outlet baffle of the damper to meet the production process requirements, and a large amount of electric energy is wasted on the valve.

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