Method for controlling combustion atmosphere in large-scale walking beam type plate blank heating furnace

A slab heating and walking beam technology is applied in the maintenance of heating chambers, heat treatment furnaces, furnace control devices, etc. It can solve the problems of not yet established heating furnace atmosphere monitoring system, etc., achieve significant environmental protection effects, increase furnace temperature, reduce Effect of Slab Burn Rate

Active Publication Date: 2009-10-21
SHOUGANG CORPORATION
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Problems solved by technology

In actual operation, the heating furnace is in a good combustion state by controlling the air-fuel ratio and adjusting the a

Method used

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  • Method for controlling combustion atmosphere in large-scale walking beam type plate blank heating furnace
  • Method for controlling combustion atmosphere in large-scale walking beam type plate blank heating furnace

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[0017] The key technology for controlling the combustion atmosphere of a large-scale walking beam slab heating furnace lies in the organic combination of the monitoring of the flue gas composition of the combustion system and the exhaust system. The secondary control controls the heating of the slab by switching the reversing valve. In a very short period of time, the actual air consumption coefficient of each section of the furnace is determined, compared with the theoretical air consumption set for each section, and the oxidation-reduction atmosphere in the furnace is determined. Adjust the air, The gas ratio is adjusted to adjust the gas and combustion air flow to achieve complete combustion, to ensure that the heat load of the heating furnace meets the heating demand of the slab, and at the same time reduce the oxidized burning loss of the slab. Taking Shougang Qinhuangdao Metal Material Co., Ltd.’s 4300mm rolling line wide and thick plate 2# heating furnace as an example, ...

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Abstract

The invention relates to a method for controlling combustion atmosphere in a large-scale walking beam type plate blank heating furnace, which belongs to the technical field of fuel combustion of industrial furnaces. A plate blank is heated through a preheating section, each heating section and a soaking section to finish the process of heating and temperature equilibrium; and in the process, a first-level computer control system and a second-level computer control system automatically generate a heating process and automatically set and control the furnace temperature in each section according to original data of the plate blank called from a database; and on the basis of an output control value of a residual oxygen analyzer, the computer control systems calculate the air consumption coefficient of each combustion area, perform dynamic track on the combustion atmosphere in the whole furnace along with the changes of thermal loads, correct the combustion atmosphere according to the actual air-fuel ratio of six combustion areas, adjust the proportion of combustion air and gas, and determine the reasonable air and gas flow to achieve the furnace temperature required by the heating process. The method has the advantages that the condition of furnace gas component changes in the furnace is quantificationally provided for a heating furnace operator in time, so that the combustion in the heating furnace reaches good state; and simultaneously, the energy-saving and environmental protection effects are remarkable.

Description

technical field [0001] The invention belongs to the technical field of industrial furnace fuel combustion, and in particular provides a method for controlling the combustion atmosphere of a large-scale walking beam type slab heating furnace, which is applied to the combustion control of a wide-thick slab heating furnace, saves a lot of energy, and simultaneously improves the heating of steel slabs. Quality, reduce billet oxidation burning loss. Background technique [0002] With the rapid development of wide and thick plate production, the upgrading of products and process equipment is also relatively fast, and the production of high value-added steel plate has higher and higher requirements for the heating process of the heating furnace. The requirements for the level of combustion control in the furnace are also constantly increasing. At present, the heating furnace combustion control system is mainly composed of control devices such as air-fuel ratio, air, and gas flow. ...

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Application Information

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IPC IPC(8): F27D7/06F27D19/00C21D9/70
Inventor 王敏胡雄光闫智平田士平董占斌张学峰张延平
Owner SHOUGANG CORPORATION
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