SU148074A1 - Method of burning high-calorific fuel in open-hearth furnaces - Google Patents

Description

Methods are known for burning high-calorific fuel in open-hearth furnaces having one regenerator, heads with three vertical channels and a water-cooled caisson. These methods do not ensure the full use of high-calorific fuel and they do not create the necessary luminosity of the torch.

The proposed method of burning high-calorie fuel is distinguished by the fact that in order to ensure good luminosity of the torch, the gas of the CC of the caisson and the burners of the open-hearth furnace is poured into the working space of the furnace with the speed determined by the pressure of the fan air and ejected in the side walls of the furnace heads.

In addition, more than half of the fan air required for burning the fuel is fed through an additional central channel from the slags to the caisson of the head. This makes it possible to prepare the fuel before burning.

FIG. Figure 1 shows the head of an open-hearth furnace used to carry out the proposed method of squeezing high-calorific fuel when it is supplied from the end wall of the caisson; in fig. 2 - the same, when fuel is supplied through the caisson log.

The preparation of the fuel is carried out in an inclined firing channel (caisson) with a supply of more than half of all air required for combustion to the fuel (gas or fuel oil). In order to better self-stabilize fuel oil or gas, reduce the output speed of their flow to goals.

ku and reduce HP of minimum spray consumption. The rigidity of the plume is determined by a significant narrowing of the output section of the caisson, an increase in pressure in the gas caisson and an increase in the mass-average velocity of the fuel and air entering the furnace to 60-70 m / s.

There are two vertical head channels for elimination of the apparent resistances obtained in the narrowing of the output window of the caisson. The channels exit to the same slag as the central channel. They are equipped with ejector units that, during the period of fuel supply to the furnace, distribute air entering the central and lateral vertical channels. In the period of movement on the head of the combustion products, ejector units transport gases through these channels.

All fuel (see Fig. I) is fed into the end of the caisson U with the help of a burner or nozzle 2. Over half of the pressure in the fan air 4, increased by supporting compressed air of the ejecting units 5, is fed through an additional central channel 3 air required for combustion.

During the movement of the combustion products to the head, their main part enters through channels 6 by means of ejecting installations 5. Through the central channel 3 the rest of the products of combustion are fed.

When the furnace is heated with natural gas, especially coking, the fuel supply can be carried out with its oncoming movement and air in channel 3 fcM. FIG. 2).

The proposed method can successfully sulphurous fuel oils and low-viscosity liquid fuels (gas oil, saline oil, straight-run fuel oils, etc.).

Subject invention

Claims (2)

1. The method of burning high-calorific fuel in open-hearth furnaces having one regenerator, heads with three vertical channels and a water-cooled caisson, E which carry out preliminary PREPARATION of the fuel, characterized in that, in order to ensure good luminosity of the torch, gas from caissons and burners It is fed into the working space of the furnace at a rate determined by the pressure of the fan air and the ejecting devices in the side chambers of the furnace. 2. A method according to claim 1, characterized in that, in order to prepare the fuel before it is burned, more than half of the fan air required for combustion. served by an additional central cial from the slags in the caisson of the head.  BUT FIG.  2