Combustion control method for heat accumulating type heating furnace during cold and hot mixed loading and compact heat accumulating type heating furnace

Abstract

The invention discloses a combustion control method for a heat accumulating type heating furnace during cold and hot mixed loading and a compact heat accumulating type heating furnace, and belongs to the technical field of heating furnace control. The method comprises the steps that along with reduction of the proportion of red blanks in cold and hot mixed loading and increase of the gas inlet amount of coal gas for combustion, a plurality of closed combustion units and heat accumulating chambers are opened in stages, and the closed heat accumulating chambers are prepared before opening; and the preparation method comprises the steps that a first heat accumulating chamber on the single side is firstly opened to conduct cold gas or cold air inlet operation for first time and then closed, a second heat accumulating chamber on the corresponding side of the first heat accumulating chamber is subjected to cold gas or cold air inlet operation for first time, and then the combustion units and the heat accumulating chambers are opened to conduct normal reversing combustion. Combustion control under small gas flow during cold and hot mixed loading of the heat accumulating type heating furnace is achieved, flue over-temperature flash explosion is eliminated, production is compact, production can be rapidly recovered easily under the conditions of rolling stopping and the like, heating furnace equipment is compact, the heat storage capacity is remarkably improved, and combustion control over the heating furnace is facilitated.

Description

technical field [0001] The invention belongs to the technical field of heating furnace control, in particular to a combustion control method for a regenerative heating furnace when cold and hot are mixed, and a compact regenerative heating furnace. Background technique [0002] The original design output of the heating furnace in No. 3 steel bar workshop was 130t / h. With the speed-up transformation of the rolling line, the output has been increasing day by day. The rolling line has a production capacity of 185t / h. Due to the insufficient capacity of the heating furnace, the phenomenon of waiting for temperature often occurs. In order to meet the production requirements, the heating furnace is forced to heat, but sometimes it still cannot meet the requirements of the rolling line. At the same time, the furnace pressure rises (reaching more than 80Pa at the peak), which will cause great erosion damage to the heating furnace body and equipment. In response to this situation an...

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Problems solved by technology

The increase in production capacity and the reduction in gas consumption brought about by roller table red feeding have produced huge benefits. However, because the rod three heating furnace is a regenerative heating furnace, the red billets or red billets transported on the roller table or warm billets and red billets When billet and cold billet are mixed, it also brings some new problems in combustion control

[0003]1) When steel billets are sent or mixed, the amount of gas required is small. At the same time, the high-coke mixed gas used in the No. When the flow rate is low, it is difficult to control the temperature of the flue gas discharged from the heating furnace

[0004]2) When the steel billets are sent or mixed, the rolling line breaks down, most of the regenerators will be double-closed, and the temperature of the regenerators is overheated, causing Flue overtemperature flash explosion

[0005]3) Caused by reasons such as continuous casting machine changing times, rolling line failure, rolling line changing hole and roll changing, roller table conveying rhythm inconsistent with furnace entering rhythm, etc. Difficult temperature control when hot and cold blanks are mixed

[0006]According to the above problems, combined with the characteristics of the regenerative heating furnace and the actual operation practice of the three-rod heating furnace, aiming at the mixed heating and cooling of the regenerative heating furnace Combustion control methods need to be improved urgently to eliminate the disadvantages of over-temperature flash explosion in the flue and difficulty in controlling the heating furnace under small gas flow

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