SU1691395A1 - Air heater for blast furnace - Google Patents

Abstract

The invention relates to ferrous metallurgy, in particular, to the design of apparatus for heating air blast of blast furnaces. The purpose of the invention is to increase the temperature of the air heater blowing by eliminating overflows of the air mixture and blowing (mine the nozzle) and increasing the durability of the caisson. To achieve this goal, the caisson is located between the outer envelope of the combustion chamber and the nozzle, and also has gas-tight movable connections with the air heater casing, consisting of elements (plates, angles, etc.) attached to the casing with vertical grooves into which the side faces are embedded caisson. and sealing gaskets are installed, and these connections are made outside the installation zones of the hot-air choke fitting and the gas and air supply connections. 3 il.

Description

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The invention relates to ferrous metallurgy, in particular, to the design of apparatus for heating air blast of blast furnaces.

The purpose of the invention is to increase the temperature of the air heater blowing by eliminating overflows of the air mixture and blowing (mine the nozzle) and increasing the durability of the caisson.

FIG. Figure 1 shows the lower part of the blast furnace air heater, where the axes of the gas burner nozzles and the hot blow are conventionally combined, a longitudinal section; Fig. 2 shows the air heater at the level of the hot-blown choke;

The blast furnace air heater contains a casing 1 with a lining of radial walls 2, 3, a nozzle 4, an integrated side burning chamber 5 with an inner 6 and an outer 7 lining lambers. A caisson 8 is installed in the lower part of the apparatus, resting on the bottom 9 of the casing. A burner device 10 is installed at the bottom of the combustion chamber with gas inlet and air-12 nozzles. Above the burner 10, the combustion chamber 5 is connected to the choke 13, which is blown hot. The caisson 8 is located between the outer chamber 7 of the combustion chamber 5 and the nozzle 4 so that its side faces 14 with the heater case 1 have movable joints consisting of elements 15 attached to the shell 1, with vertical grooves 16, in which the side faces 14 are embedded 8 gaskets and 17 gaskets are installed. The movable connections are made outside the zones of installation of hot air fittings 13 and gas 11 and air nozzles 12. The outer shell 7 of the combustion chamber 5 is elliptical

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shaped and passes through the masonry breaks of the radial walls 2 and 3 to the movable joints. The inner chamber 6 of the combustion chamber 5 is made round. A layer of gunning mass 18 is applied to the inner surface of the caisson 8. The nozzle 4 of the air heater rests on the sub-grates 19 and columns 20 located in the sub-nozzle 21, to which the nozzles 22 for exhausting the cold and blowing the cold 23 are connected. with a metal caisson 8 and a casing 1 of the air heater.

The heater works as follows.

During the heating period of the apparatus, gas and air through pipes 11,12 enters the burner 10, where a gas-air mixture is formed, the fuel burns and burns in the combustion chamber 5. Combustion products through the dome space enter the channels of the nozzle 4 and, after giving their heat to the nozzle, they are cooled and discharged through the sub-nozzle 21 to the smoke pipes 22, burs, chimney and atmosphere. Metal caisson 8 prevents penetration of the gas-air mixture and products of incomplete combustion through cracks in beds 6 and 7 of the combustion chamber 5 and its bottom, directly from the lower part of the combustion chamber 5 to the subassembly device 21. Gas-tightness of the caisson 8 is provided by sealing gaskets 17 in a movable joint allows you to eliminate thermal stress arising at the junction, as well as its tight fit to the bottom 9 of the heater casing 1. The gas-tightness of the caisson 8 at the bottom 9 of the apparatus is also ensured by a tight (with the help of compensatory pads) fit to the bottom masonry. Such an embodiment of the caisson prevents the possible flows in the known structures and at the same temperatures and flue gases reduces the heating gas consumption, which increases the heat output of the air heater by increasing the combustion efficiency.

Possible flow of heating gas through the separation seam with such

the apparatus design should not lead to a decrease in the resistance of the caisson, since access from / to the caisson is significantly hampered, one more layer of refractory was added — the outer lining of the combustion chamber and the layer of gun mite retained. Outside (from the side of the nozzle) the access of the heating gas to the caisson is practically excluded; such an implementation of the caisson will ensure its increase

durability and durability.

During the blowing period, through the cold-blowing inlet pipe 23, the sub-nozzle device 21, the nozzle 4 and the combustion chamber 5, air is supplied which is heated,

the passage through the hot nozzle 4, and through the hot fitting 13, it blows through the pipeline into the blast furnace. The metal caisson 8 during this period of operation of the air heater prevents cold from flowing through the cracks in the masonry from the sub-attachment device 21 and the lower part of the nozzle 4 into the combustion chamber 5 and into the hot fitting pipe. With this design of the air heater, the temperature is hot.

the blowing is not reduced due to the flows occurring in the known structures.

The application of the invention allows to increase the resistance of the caisson, reduce the flows from the combustion chamber to the nozzle and back, which

will increase the efficiency of the air heater, the temperature of the blow, as well as the durability and durability of the device.

Claims (1)

Invention Formula Blast furnace air heater containing lined casing, nozzle, built-in side combustion chamber formed by the inner and outer lining of the lining, a caisson mounted in the lower part of the combustion chamber supported on the casing bottom, a burner with gas and air inlets and blowing fitting , characterized in that, in order to increase the temperature, blowing and the life of the air heater, the caisson is located between the outer shell of the combustion chamber and the nozzle, and is made with a movable gas-tight connection of its side faces to the air heater casing outside the installation zones of the hot air nozzle and the gas and air inlets. , 2 13 fig1 fig.Z