SU825646A1 - Packing of blast furnace air heaters - Google Patents

Description

one

The invention relates to worm metallurgy, in particular to the construction of air heaters for blast furnaces, and can be applied in other branches of the national economy for the high-temperature heating of air and gases.

Nozzles of air heaters of blast furnaces, made in the form of vertical channels, during operation due to variable thermal effects can be destroyed, about the blockage of the tube in the channels, as a result of which heat dissipation and storage capacity of the air heater are reduced. Traffic congestion in the channels may also be generated due to clogging with construction debris that is trapped in the reflow dust.

Known nozzle, made of packed brick brand NK-1 with depressions on the small lateral edges. A brickwork of such a brick has, in addition to vertical, also horizontal channels, which allow for the blocking of individual vertical channels to organize the flow of gases and blow around the traffic jams fl and 2.

However, this nozzle has a small area and branching of the horizontal channels, which does not allow t to achieve effective redistribution of the blow and gas. . The purpose of the invention is to increase the storage capacity and heat transfer of the air heater by increasing the heating surface of the nozzle and organizing an intensive horizontal redistribution of the blow.

The goal is achieved. The fact that the Novice brick is equipped with two rows of horizontal holes, the axes of which are symmetrical to the vertical axis of the brick at a distance t), 8-1.1 of its thickness, and the sukolarnaya tschaschad holes has 8t12% of the area of the larger edge of the encapsulating brick .

FIG. 1 isobreusena. Chasadka, general view; fig 2 is the same horizontal section; on fig.Z - nozzle brick, a general view; Fig.4 section aa on Fir.3.

The air heater attachment consists of packed bricks 1, which form vertical ducts 2 during the laying process. Bricks 1 are equipped with two rows of horizontal holes 3,

Claims (2)

The axes of the coils are symmetrical to the vertical axis of the brick at a distance of 0.8–1.1 of the thickness of the latter, forming a horizontal network of channels in each row of the brick. The total area of the holes 3 is 8-12% of the area of the larger face of the packed brick 1. During heating / passage through the vertical 2 and horizontal channels formed by the holes 3, hot gases heat the packed bricks 1. At the same time, a branched network of horizontal channels a large area allows to reduce the temperature drop across the nozzle section, which at the present time can reach even more. During the period, a network of horizontal channels is blown, which allows effective flow of cold air between vertical channels 2 with different heating of their walls, and also maintains the stability of patksTB of all horizontal channels when blocking some of them. the heating surface increases by 1.3 times, the conditions for heat and mass transfer are improved, the temperature is increased by blowing 5-10. Invention formula The nozzle of blast furnace stoves consisting of packed bricks in The form of rectangular parallelepipeds that form vertical channels, characterized in that, in order to increase the storage capacity and heat transfer of air heaters by intensifying heat transfer due to horizontal redistribution of gases and blowing in the nozzle, in a packed brick two rows of horizontal holes are made, the axes of which are symmetrically arranged the vertical axis of the brick at a distance of 0.8-1.1 of its thickness, with the total area of the holes being equal to 812% of the value of the area of the large face of the packed brick. Sources of information taken into account during the examination 1. Heat and mass transfer in the layer and channels, heat engineering of blast furnaces and heat exchangers. Collection of scientific papers VNIIMT, №20. M., Metallurgists, 1970, pp.171-183; 2. Heat transfer and aerodynamics in metallurgical aggregates. Collection of scientific papers VNIIMT, 13, M., Metallurgists, 1967, p.5-21. ABOUT about o Ci Ci oh oh oh oh oh oh oh oh g- Y /////. U ////