Method and device for automatically controlling coal gas recovery of converter

Abstract

The invention discloses a method and a device for automatically controlling coal gas recovery of a converter of a steelmaking enterprise. A coal gas analyzer detects CO content in a coal gas recovery pipeline; a gasholder position detection transmitter detects the position of a gasholder; a CO content signal and a gasholder position detection signal are sent into a PLC; and the PLC automatically controls the on and off of a valve of the recovery pipeline to determine whether to allow to recover the coal gas or not. Two gears of CO content values of the coal gas are preset, and then an upper gasholder position value and a lower gasholder position value are set on the gasholder. When the gasholder rises to a high gasholder position, the device recovers the coal gas according to high-gear CO content; and when the gasholder descends to a low gasholder position, the device recovers the coal gas according to low-gear CO content. The method and the device overcome the defects that the conventional converter coal gas recovery technology cannot ensure both coal gas recovery capacity and coal gas recovery heat values, recover the coal gas with a high heat value as possible, reduce energy waste, and provide stable and efficient coal gas supply for converter coal gas users.

Description

1. Technical field [0001] The invention relates to the recovery of converter gas in steelmaking plants, in particular to the control of CO content in gas recovery. 2. Background technology [0002] Nowadays, the converter gas in the steelmaking plant adopts recovery measures to solve the loss and air pollution caused by the natural discharge of the converter gas as waste. The general process of converter gas recovery is: after the flue gas produced by the converter is cooled, purified and dehydrated, the gas analyzer installed behind the fan analyzes the percentage of CO, and the CO content is used as the standard, and the recovery is started when the CO reaches a certain concentration. The three-way valve allows the filtered converter gas to enter the storage gas cabinet, and when the counter of the gas cabinet reaches a certain height, the excess gas is vented. [0003] At present, the allowable recovery value of CO content in converter gas recovered by steelmaking enterp...

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Problems solved by technology

[0005] When the allowable recovery value of CO content in recovery converter gas is set to 30% (low content), the gas recovery can be guaranteed, but the recovery heat value is reduced, especially when the steel output is high, the gas cabinet always hovers at the upper limit , each furnace of steel only collects the gas with low calorific value in the early stage of smelting into the cabinet, and when the CO content rises, the gas cabinet is full, so that the mid-term high calorific value gas is released

Gas recovery volume and gas recovery calorific value cannot be balanced

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