SU1491897A1 - Method of heating regenerative soaking pits - Google Patents

Abstract

The invention relates to methods for heating regenerative heating wells and can be used in the metallurgical and other industrial sectors. The goal is to increase productivity, reduce fuel consumption and metal burn. The method includes the supply of low-heat and high-heat gases. When the desired temperature is reached, the heat output is reduced at a rate (8-10) ^. 10 ⁶ kJ / h for a 0.135–0.20 period of languor at a constant flow rate of high-heat gas during this period, after which its supply is stopped. The implementation of the heating method allows to reduce the specific fuel consumption by 1.5 kg / t and increase the productivity of the well by 10.8%. 3 il.

Description

The invention relates to methods for heating regenerative heating wells and can be used in the metallurgical and other industries.

The aim of the invention is to increase productivity, reduce fuel consumption and metal loss.

The method is carried out as follows.

The ingots planted in the heating well cell are heated at a constant flow rate of high-soldering (coke or natural) and low-dissolving (blast-furnace) gases, providing 1 taggglovy power required to raise the size of the working space and the metal at maximum speed.

When the temperature of the cell reaches a predetermined temperature by heating technology for 0.135–0.20, the duration of the period of languor is reduced by thermal power at a rate of (8–10) × 10 kJ / h. At the same time, the consumption of coke oven gas remains unchanged, equal to its consumption during the period of temperature rise.

The increase in the time of supply of high thermal gas by more than 0.2 periods of languor and a decrease in

 ;about

00

with

In this way, the heat reduction rate of less than 810 kJ / h leads to the melting of ingots and the deterioration of the quality of metal heating.

Reducing the time of supply of highly thermal gas by less than 0.135 languor and increasing the rate of decrease by more than 10 k10 kJ / h do not provide the heat fluxes required under heat exchange conditions, which leads to a decrease in productivity and an increase in specific fuel consumption and metal carbon.

Reduction of heat output with the indicated speed (8-10). 10 kJ / h is provided by reducing the consumption of blast furnace gas. Until the end of the tom1L1I period, the set cell temperature is ensured by varying the flow rate of the blast furnace gas.

FIG. 1 shows a temperature diagram of the process of heating the metal; in fig. 2 - heat diagram; in fig. 3 is a diagram of the variation in the blast-furnace and high-heat consumption (coke or natural gas in the process of heating the metal.

PRI me R. In a regenerative heating well with a cell size of 5600x2870x3230 mm, 8 ingots of steel are heated. 5pps weighing 9.575 tons each with a surface temperature at 750 ° C.

During the period when the temperature rises for 2 hours and 5 minutes, 250 m / h of high heat-slug (coke) gas and 3,600 m / h of low heat-slug (blast-furnace) gas are supplied to the working space.

When a predetermined temperature reaches 1340 ° C in the well, the consumption of coke-oven gas of 250 m / h is maintained for 15 minutes;

ten

)

91897

reduce at a rate of 10 o 10 kJ / h by reducing the consumption of blast furnace gas from 3,600 to 2,650.

1 15 minutes after the beginning of the period of languor (i.e. after 0.15 duration of languor, which is 1 h 40 min), the coke-oven gas is turned off, the consumption of blast-furnace gas is increased to 3,600 m / h and in order to maintain the temperature of the cell at a given constant level For 1 h 25 min the consumption of blast furnace gas is reduced to 1500 m / h. 3 hours and 45 minutes after the landing, the ingots are given into rolling.

When ingots are heated by the proposed method, the total heating time is reduced by 20 minutes, the specific fuel consumption is 1.5 kg / t, the well productivity increases by 10.8%, the ingots are heated uniformly throughout the volume, and the scale formation does not increase.

15

20

Claims (1)

25 claims A method of heating regenerative heating wells, comprising a continuous low-flow gas supply during the languid period and a periodic high-heat gas flow, characterized in that, with the aim of increasing productivity and reducing fuel consumption and metal fading, the left power is reduced at a rate of (8–10) .10 kJ / h for a period of 0.20 of languor due to a decrease in the flow of low-heat gas at a constant flow of high-heat gas during this period, after which the supply of high heat gas is stopped. & Fi & .g Phage.1 time 1 V domain TGKoksoviyi (Nature ny) Fiz.Z Time T