Ignition control system of cold-rolling continuous annealing furnace

Abstract

The invention relates to an ignition control system of a cold-rolling continuous annealing furnace. An ignition station is connected with a main control programmable logic controller and an ignition observing disc respectively; the main control programmable logic controller is bi-directionally connected with a field operation box; the ignition observing disc is bi-directionally connected with a field ignition disc; after being connected in parallel with a nitrogen pipe, a gas pipe is connected with an ignition nozzle; an air pipe is connected with the ignition nozzle; a pneumatic shutoff valve and a valve station are arranged on the gas pipe; the pneumatic shutoff valve is arranged on the nitrogen pipe; the valve station is arranged on the air pipe; the main control programmable logic controller is respectively connected with and controls the pneumatic shutoff valve; the ignition observing disc is connected with and controls the valve station; the main centre of the ignition observingdisc is the ignition observing disc consisting of a flame detection unit and a programmable logic controller (PLC) control unit; and ultraviolet flame detectors are uniformly arranged on the ignitionnozzle and are connected with the ignition observing disc. The system has few solenoid valves, low engineering cost, low maintenance cost, short ignition time, low debugging workload, high safety anda relatively independent ignition system.

Description

technical field [0001] The invention relates to an ignition control system for a metallurgical furnace, in particular to an ignition control system for a cold rolling continuous annealing furnace. Background technique [0002] Compared with the electric heating continuous heating furnace commonly used in the general heat treatment industry, most iron and steel enterprises use gas-heated continuous annealing furnaces. This is to make full use of the by-products coke oven gas (COG) and converter Coal gas (LDG) and blast furnace gas (BFG). [0003] At present, there are two common burner ignition schemes for cold-rolled continuous annealing furnaces: first, the burner adopts pulse combustion control, and each pulse burner is equipped with a one-to-one intelligent combustion controller (BCU). The BCU accepts the command of the remote main PLC to complete it automatically; another solution is to configure the ignition burner with an open flame, and the main burner adopts continu...

AI Technical Summary

Problems solved by technology

[0005] (1) The number of solenoid valves is huge, the engineering cost and maintenance cost are high; the safety is poor

[0006] (2) The ignition operation is too dependent on the HMI screen of the main PLC, and the ignition time is long

[0007] (3) The composition of the ignition system does not form a relatively decentralized and independent system with the main PLC; the debugging workload is heavy, and the system security is poor

[0008] (4) The ignition system cannot be relatively independent, and cannot be developed and promoted as an independent product

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