SU725A1 - Flame furnace for melting or heating metals - Google Patents

Description

In order to achieve high temperatures in welding furnaces for forging forgings and melting of metals and for a more economical consumption of fuel, heating of air in regenerators and recuperators is used, and in some cases reverse flow of a part of exhaust gases to the furnace.

With fuel oil, naphtha air is usually supplied to the combustion chamber. In solid fuels, heated air is supplied as secondary air for burning carbon monoxide and other unburned parts of the gases produced from the firebox.

Furnaces of medium and small sizes work on oil without pipes, furnaces on solid fuel - coal, wood, charcoal, peat, etc., usually work with chimneys. The smaller the furnace and the shorter, the more useful its effect in terms of fuel consumption per unit of metal being heated; especially large losses are obtained with solid fuels, where the combustion of gases is slower and requires a longer period of time and path.

In view of this, it is particularly important in the case of solid and especially wood fuel and peat to use waste gases by passing them through a heat exchanger and recycling them back into the furnace working space.

The proposed flame furnace for smelting or heating metals is designed to work economically, even with wood fuel and peat, without a chimney, to achieve high temperatures and the opportunity for wood fuel to perform the same forgings that are usually carried out in blacksmith forges.

FIG. 1 shows in longitudinal vertical section a fiery furnace for smelting or heating metals, and FIG. 2-7 (recuperator) furnace modification (in Fig. 4 - sections along the X-X and 2-2 in Fig. 3, and in Fig. 5 - a section y-y in Fig. 3).

The furnace consists of three main parts: the furnace A, the working space G, and the air injector with a mixing chamber PI for returning the waste gases (Fig. 1) to the furnace; a recuperator is used to increase the efficiency of operation (Fig. 2)

FIG. Figure 1 shows a section of a furnace operating without a pipe with a reverse flow, flowing through channel 3, kg. Of measure H and outlet V, of gases into the furnace. For For example, through the channel 3 to the chamber H and pushing them further through the hole U into the tube, the air blower G or E was installed, through which the air from the fan was blown. Upon leaving the nozzle, the air mixes with the waste gases, warms up and, getting into the space D where the gases from the downstream firebox, which works at the desired rate of fuel, are absorbed, contribute to the burning of carbon monoxide and other gases that are not yet completely burnt. Excess gas escapes from the working space through the working door Yu or through special holes made in the back of the furnace.

A more beneficial effect of the furnace will be if the furnace is provided with a heat exchanger.

When working on wood or. The peat kiln has a semi-genetically rotary firebox (Figs. 3, 4: and 5), covered with a roof H, a loading hole for the firebox B or a usual hopper, 7 (Fig. 6). Grate bars / G are located at the bottom, hole C connects the space of the furnace with the outlet channel D, from where gases flow into the working space of the furnace W, covered with roof H. From the working space M, the gases go one or more downstream channels 3 down and pass one or more 1 horizontal (fig. 3) inclined or vertical (fig. 7) chimneys, / 3, between which one or several horizontal, vertical or inclined

5j, B, in which

air flows.

The air leaving the recuperator enters chamber H (Fig. 5), and the jet, acting as an injector, sucks the basics out of the channels G, A A through them out of the working spaces together out through the hole Y in |

prrh.rd D, where it is displaced with gases, from the firebox.

the air under the grates at TBepjJQM combustible is supplied with a pipe / 7 with a PADDY1K1SOY R, and the air into the recuperator with a pipe T with a valve U. Regulating the valves P and U of the amount of air entering the grate into the furnace and into the pekynepafop, it is difficult to use the furnace as a generator and ny- tm pdd.ao preheating air in passage D which, together with part of the working space W, plays the role of a combustion chamber, to achieve the development of high temperatures in the working space required for the forging and foundry industries. Excess gas from the furnace vanishes through E, but a part can be discharged through one or several small holes, located in the rear part of the working space, adjusting this release with a brick overlay.

The furnace is designed to operate on both liquid and solid fuel without a pipe, and, in connection with the above, the author indicates that gas flows from the working space and pushing them back into the furnace working space directly or through peiyr-. The perator is performed by dynamic power- air leaving the recuperator of air, which flows first into the mixing chamber H (Fig. 5). that the supply of a part of the waste gases back to the furnace makes it more economical to work, that the heating of the secondary air mixed with the combustion products coming back to the furnace makes it possible to reach high temperatures.

SUBJECT OF THE PATENT.

1. A flame furnace for smelting or heating metals, characterized by (Fig. 1), that the exhaust gases, descending at the rear end of the working space M into the vertical channel 3, move further below the furnace bottom to its front end and, entraining air blown through an air-jet device E (or T), are mixed in a vertical passage D with gases coming from the bottom of the furnace working with forced blowing, and with them

r

they are reintroduced into the working space, from where part of them is removed through the leakage of the working door or special small openings at the rear end of the furnace.

2. Modification of the furnace described in paragraph 1, characterized by

(Fig. 2-7) that the exhaust gases pass under the furnace through the channels of the heat exchangers into the chamber H at the front end of the furnace, where they are mixed with the air heated in the heat exchangers, the air blown by the fan,

and chases further, too, in D.'s passage to the patent of KF Nejmnierp No. 725,