SU775578A1 - Charging-distributing device of shaft furnace - Google Patents

Description

one

The invention relates to systems for loading coal lime kilns, used in the building materials industry, in the chemical, metallurgical, food, 5 paper and other industries.

The charging and distributing devices of lime kiln furnaces with a circular cross section, operating on solid fuel 10 (using the pouring method), gaseous fuel or gasification products of the fuel, and the combined method are known, when part of the fuel is supplied by a pouring method together with 15 limestone, and another in the form of gasification products - in a layer of limestone flj.

The purpose of the load-distributing devices is to ensure the furnace gasification and the distribution of the charge over the charge cross section that is most appropriate for a given fuel combustion system, which is one of the most important conditions for achieving a high furnace performance.

However, most designs of loading devices are either very complex (for example, a kubel), or have turning mechanisms

limiters (for example, rotary non-equilibrium cones, chute distributors), which have low operational reliability and are out of operation if, for whatever reason, the charge level reaches the distributor.

The closest to the invention to the technical essence and the achieved result are loading devices with fixed distribution of the charge, having a two-valve gate, as well as a distributor fixedly attached by adjustable wires to the furnace wall. The distributor can be made in the form of two truncated cones connected by large bases, and the diameter of the opening of the upper conical shell is somewhat larger than the diameter of the base of the lower cone valve 2.

However, the presence of locking valves in the form of cones does not allow liberation from initial segregation due to one-sided loading with a skip hoist. This leads to the need to rotate the upper hopper with each skip loading, which complicates the loading device. With the passage of the locking cone of the lower valve through the distributor opening, the locking cone may jam if the mixture enters the gap between it and the distributor, since there are always pieces in the charge corresponding to the gap between the base of the cone and the opening in the distributor. When the level gauge controlling the upper level of the charge goes out, the latter can reach the level of the lower bunker, get between the locking cone and the saddle of the lower bunker and remove the locking cone or its lifting mechanism (this fact is observed in practice when using loading devices with a lower valve in the form of a cone).

The nature of the distribution of the charge depends on the change in its fractional composition and the degree of contamination and clay fractions. These factors determine the speed of the charge over the surface of the locking cone and thereby affect the redistribution of the charge between the outer and inner surfaces of the distributor. Especially this phenomenon will manifest itself at high humidity of the charge,

The above disadvantages of the use of this loading device in terms of distribution; rjv; xty across the shaft section 10, reflecting on the efficiency of the furnace.

The goal of the invention is 1 - increase of operational hope} -; ..

This goal is achieved by the fact that in the load-distribution /: device of a miner furnace; containing lower and upper locking ct: apans, a conical fixed valve with baffles, hoppers, in the distributor executed windows with a total area O, .015-O, O 5 from the area of its lateral surface, the tops of the distributor and the bottom grgperator valve are located s are ocii below the intersection points of the forming hoppers at a distance of 0.05-0.15 diameter of the saddle of the hopper.

The top of the distributor can, if necessary, be offset from the axis of the loading hoppers by a distance of up to 0.1 (1, where d is the diameter of the outlet of the hopper.

FIG. 1 shows the boot-distributing device; FIG. 2 is a section A-A in FIG. one.

The loading and distributing device has a closure upper valve in the form of a bell 1, an upper beech 2, a closure lower valve bell 3 and a lower hopper 4. The top of the lower bell is located in the area of intersection of the cone-forming upper hopper. Under the hoppers

fixedly, for example, a distributor 6 is suspended on the hooks 5; Windows 7 and breaker plates 8 are made on the surface of the distributor 6. The distributor is suspended in such a way that its tip is located in the intersection area of the cones forming the lower bunker. To adjust the position of the apex of the distributor relative to the axis of the shaft, adjusting units 9 are made on the tops 5.

Works boot device as follows,

S top hopper 2 with skip hoist is fed, charge. Most of the small and medium fractions are concentrated from the side of the skip, and large ones are segregated to the opposite side. When opening the upper valve of the bell 1, the charge is poured into the lower bunker -1, while in the region of the top of the lower valve-bell 3 the charge flows intersect and intermix, which leads to a decrease in the initial segregation, Vershk; of the chipper, which evenly distributes the charge B to the volume of the lower bunker. When the bell of the bottom 1-1 of the bell pops. Iaot from the 1st vertex of the spreader 6, pumchem in the area of the intersection of the streams iii xrbi pro; .1

C :: points of view of uniform rei ..; H:; a PIA fluxes satisfactory results are obtained when the Ber1aiky of the locking bell and the distributor is located on the axis below the intersection point of the forming hoppers of distance O1, 05-0,15 d. where ci- is the hole diameter of the hopper. The part of the charge that moves along the noijSpxFocTH of the distributor 6 falls into the E 7 and from the chippers 8 to the center: the other, the other part, DBI.1a sme: the windows 7, the priest. falls into the mine field. When c; ::: C1 slopakno .. boot device .-; can be in :; M1-1KNut need for korrvkgchrskh; .; e distribution in the district Kciiipaii.neiiHK, which is performed by means of the radial displacement of the top and distributor to the distance O 1 cm by adjusting the nodes 9.

Dp of pouring furnaces, in which a uniform distribution of mAh across the mine section is required, the area of the windows is chosen so that the part of the charge, approximately equal to half of the loading quantity, passes between the windows, and the other part, falling into the dam, is distributed into the radialum from the strikers direction. The total area of the windows is about 0.05 of the total side surface area. The minimum amount of heat introduced by the pour-off method is.

In this case, 15%, respectively, of the area, of the windows will be equal to 0.015 of the lateral surface area of the distributor.

Thus, the proposed charging and distributing device of the shaft furnace allows to exclude the initial segregation and one-sided loading made by the skip hoist practically without a rotary bunker, as well as to avoid failure of the gate when the charging device level is accidentally reached. By varying the total area of the windows and the angles of inclination of the bump stops, it is possible to obtain a different distribution of the charge over the cross section, from uniform distribution to distribution with the largest fraction in the center. All this leads to a significant simplification of the design of the boot device and an increase in its operational reliability with the most appropriate for a particular combustion system distribution of the charge over the cross section.

On the basis of the described loading device, it is possible to unify a typical loading device for furnaces operating on the pouring and combined burning methods / and also only on gasification products of the fuel.

Claims (2)

1.Tabunshchikov N.P. Lime production. M., Himi, 1974, p.126-133. 2. The patent of England No. 846373, cl. 51/2 B, pub. 1960 Level Fn9. 2 /