Method of destructing solid iron blocks

FIELD: process engineering.

SUBSTANCE: invention relates to destruction of solid iron blocks, including waste forming rolls and may be used at drop-hammer plants. Irregular thermal strains are created inside iron block. For this, high-temperature jet-piercing heat source is used to drill blast-hole in said block to be gradually advanced there inside. Required depth reached, heat source is stopped to go on feeding heat inside the block via formed blast-hole. Said high-temperature jet-piercing heat source represents a thermal oxygen lancing. Intensive heating of block inside results from combustion of oxygen lance.

EFFECT: expanded performances.

6 cl, 5 dwg

 

The invention relates to efficient methods of destruction massive cast-iron monoliths, including exhaust cast iron rolls and can be used in hoisting the shops of metallurgical plants and enterprises of the processing of scrap metal.

There is a method of destruction of large metallurgical wastes, including powerful rolls of rolling mills (RU # 2042098, IPC 6 F27D 3/15, SW 1/248, publ. 1993). This method includes forming a hole in the object of destruction, bookmark it explosives, initiation of the explosion, while the borehole is formed by a shaped jet formed during the explosion of the shaped charge, shaped charge is directed to the area of the center of mass of the destroyed object.

This method is effective because the cumulative explosion occurs the formation of a hole with a diameter of 60-100 mm and a length of 700-1400 mm However, this method requires special equipment and explosives, as well as increased security measures.

Known is the closest to the claimed invention is a method of thermal oxygen-Kopioi cutting metals (RU # 2330748, IPC WK 7/08, publ. 2006). In this method, after creating the initial focus of the liquid melt and combustion, the working part of the spear is cooled to the lowest possible speed of combustion through the submission of high-energy spear is th jet with elevated values of mass transfer of oxygen and by setting the end of the working part of the spear with a gap relative to the surface of the metal, this intensification of the process of cutting is provided by a fuller and more intense combustion of the cut metal that occurs as a result of intracavitary turbulence the high-energy Kopioi stream.

This invention is applicable only for cutting large steel arrays, since the flow of heat in the cutting zone is mainly due to the combustion of cut steel material.

The technical result of the invention - expanding Arsenal of technical means and technologies of destruction cast monoliths.

The technical result is achieved by the fact that produce drilling the borehole through thermal oxygen-Kopioi cutting with the gradual promotion of the oxygen lances inside the monolith, and upon reaching the desired depth of hole stop further advancement of the oxygen lances inside the monolith and continue continuous supply of thermal energy through the formed hole with intensive heating the inner part of the monolith without it melting before it is cracking due to the combustion of material of the oxygen lance.

As a monolith for the destruction of used exhaust cast iron mill roll, with the drilling of the hole produced in the diametrical direction to the longitudinal axis of the roll. As a COP who I heat the oxygen Kopioi use cutting tube, in the cavity which are additional rods for combustion, an additional core feature along the entire length of the tube and deliver it in the form of a twisting of the several wires of round cross-section. For drilling the borehole used oxygen lance without additional rod inside the tube, and for intensive heating the inner part of the monolith using a second oxygen lance with additional rod inside the tube. When the destruction of the exhaust cast iron roll intense heating can be carried out only in one half of the cross-section of the roll while drilling the borehole is produced so that a point burning spear in the hole was at the point of the hole, equidistant from the boundaries selected for warming up half of the cross-section roll.

Figure 1 shows a diagram of the implementation of the basic variant of the method with Central heating in cross-section monolithic mill roll; figure 2 - view a, figure 3 - design of an oxygen lance with an inner insert, the core section; figure 4 is a cross-section B-B figure 3; figure 5 - diagram of the implementation of an additional variant of the method with peripheral heating of the mill roll, the cross-section.

The method of destruction of the massive cast-iron monolith as follows (Fig.1-5).

First (1,2) by burning oxygen lance 1 thermal oxygen-Kopioi cutting in a massive cast-iron monolith (for example, cast iron mill roll 2 Sabouraud hole 3, gradually promoting burning oxygen lance 1 inside of the roll 2 (for example, in the diametrical direction 4 to the longitudinal axis 5 of the roll 2)blowing the slag formed by the excess oxygen lance 1.

Upon reaching the required hole depth 3 (for example, to the longitudinal axis 5 of the roll 2 or deeper) stop further advancement of the lance 1 inside a monolithic roll 2. This may be continued spears 1 for its intended purpose - blowing at the end of the bore-hole 3 teardrop-shaped cavity 6, the size of which is larger than the diameter of the borehole and which may be useful for further scaling up of uneven thermal stresses inside the roll 2 (i.e. with the purpose of intense heat without melting of the formed walls of the hole).

After the formation of the hole 3 (the hole 3 can be extended beyond the location of the teardrop-shaped cavity 6, for example, to improve the conditions of the heating roller 2, such an elongated hole in the drawings, figure 1,2, are not shown, but the drilling of the hole 3 to the through holes, i.e. the "output", it is undesirable because of the large heat loss through the through hole), it is necessary to intensify the process of heating all formed inside of the roll 2 of the walls and bottom of hole 3, because the faster they will reach the maximum possible is the temperature (in the optimal mode without melting of the walls and bottom), the fuller will be used the possibility of heat transfer in the depth of the material roll 2 in all directions 7, 8, 9, 10, 11 in the median plane of the roller 2 (Fig 1) and in all areas 12, 13, 14, 15, 16 sets of profile planes of the roll 2, passing through the longitudinal axis 5 of the roll 2 (figure 2), the greater will be the temperature differences in the material roll 2 and the more uneven thermal stresses will occur in the array of material roll 2 (which can lead to the destruction of the roll 2, for example, to the appearance of cracks 17 on the surface 18 roll 2).

Therefore, it is necessary to continue the continuous intensive supply of thermal energy through the formed hole 3, but without melting the material of the roll 2, as in the drilling of bore 3. In this way continue to bring the same exothermic heat energy from the combustion of iron spears 1 oxygen, but narrow flare-onestrike heat in the stream of excess oxygen Kopioi cutting convert through the elimination of unnecessary oxygen in point heat, i.e. Kopioi flame convert to bitmap burning iron spear 1 when nonredundant the supply of oxygen (for example, when the reduced oxygen pressure or at reduced pipe bore spears 1).

Nonredundant the oxygen supply into the borehole with the maintenance in encinosa burning iron possible, because, first, the entire cavity of the bore-hole 3 is constantly filled coming from spears 1 oxygen, secondly, all products of combustion are forced out a weak pressure of the incoming oxygen and time to give most of the heat to the walls of the bore-hole 3 and, thirdly, the inside of bore 3 is constantly maintained the original high temperature necessary for intensive oxidation (combustion) iron spear 1.

When the above-described stopping further advancement of the spear on the end of the formation of the hole 3, the conversion onestring burning spear point in burning spears and, especially, when occur the desirable intensity of spot burning spear - the presence in the borehole 3 teardrop-shaped cavity 6 can prevent the melting of the walls and bottom of hole 3 and slagging combustion products of the spear with the decrease of heat transfer coefficient in the material roll 2 (especially at the optimum location of the spear in the center of the teardrop-shaped cavity 6 and the dimensions of this cavity is greater than the diameter of hole 3 several times, for example, 2-3 times).

However, further enhancement of the burning spear inside cavity 6, it is desirable to increase the number of burning iron. This increase reach, for example, by introduction into the tube of the lance 1 additional material for exothermic combustion with a corresponding increase feed the oxygen for combustion of the supplemental material. It is desirable to increase the total surface area of response of the additional material with the oxygen entering the spear, 1, and, if possible, to increase the resistance to the flow of oxygen in the tube of the lance 1 (especially for fast heating extra iron for its rapid ignition and point of combustion lance for excluding the receipt of excess oxygen, for example, at the optimum pressure of the oxygen Kopioi cutting not to use intuitive control pressure of the incoming oxygen). These two goals can be easily achieved, for example, regulating the basic technical characteristics of spears 1 with the inner insertion of additional iron-containing material for each value of the oxygen pressure used in oxygen-Kopioi cutting.

For example, figure 3, 4 shows the design of the spear 19 with the inner box 20, in which the greater part of the transverse bore of the tube 21 is filled with additional material of the inner insert 20 and lower portion 22 of the transverse bore tube 21 serves oxygen optimum pressure used for oxygen-Kopioi cutting. This construction spears 19 meets both of the above purposes, as box 2 include the entire length of the tube 21 and carry it in view of the twisting of several wires 23 of circular cross section. The most accurate diameter of the insert 20 (in order to give a certain amount of oxygen at a lower part 22 of the cross-section of the tube 21 can be conveniently performed in a twisting of the 7 round wires, as shown in figure 3, 4.

However, it can be done other ways spears 19. For example, twisting of the inner insert 20 into the tube 21 may be made of a smaller or larger number of wires 23, and not necessarily of circular cross section, as, for example, rectangular cross-section. It is possible to achieve a significant increase in resistance to flow of oxygen (including, for example, by reduction of the gap 24 between the insert 20 and the tube 21, the presence of many ribbed necks 25 and ribbed extensions 26 twisted insert 20, the twisting jet of oxygen when it reaches the interior of the tube 21).

The possibilities of the proposed method of destruction massive cast-iron monoliths can be greatly extended, for example, some of the below described processing methods that can be applied in advanced technology.

For example, for convenience, can be used two different spears (to eliminate random factors), for example, for drilling the borehole 3 use oxygen lance without additional material inside the tube, and for intensive heating the inner part of the monolith and the use of the second oxygen lance with additional material inside the tube, with the above regulated characteristics, guaranteeing high quality and high efficiency.

You should specify that in figure 1, 2 shows a variant of drilling bore-holes 3 tilt down. However, the hole may be drilled in both horizontal and inclined upwards (not shown), for example, to improve the conditions of blowing teardrop-shaped cavity 6 and remove toxins.

As if there were no visible signs of destruction of the monolith, and if there are cracks after intensive heating the inner part of the monolith it can split a powerful blow, such as pile breakdown.

The larger size of the monoliths, as well as for their different physico-chemical and mechanical characteristics of the best there may be other points of drilling holes (i.e., not in the center of gravity of the monolith, as in the above described embodiment of the method of destruction in figure 1, 2).

For example, a very effective can be intense warming (figure 5) is not from the center 27 of the massive roll 28 in the directions of all peripheral portions 29, 30, 31, 32 of the roll 28 (as in the above-described basic version), but only, for example, the upper half section of the roll (shaded in figure 5). In this case, the hole 33 drilled in the roll 28 so that the center 34 teardrop-shaped cavity 35 was approximately equidistant from the boundaries of the selected area of the cross section is Alka (i.e. from the borders of the upper half section of the roll 28). When the hole 33 can be extended further teardrop-shaped cavity 35 continued section 36 of the bore-hole 33 (with the aim of improving conditions of rapid heating of the entire upper half section of the roll 28). While the total uneven thermal stress and, consequently, their total tearing efforts in the preheated upper half section of the roll 28 will have not only great value, but high leverage actions in relation to the bottom (where there's no shading on figure 5) half section of the roll 28 and particularly in relation to its peripheral area 31 left in the cold. Therefore, due to the large shoulder action efforts in the upper half section of the roll 28 relative to the lower half section of the roll 28 is most likely hidden microscopic or open cracks in the lower half-section from the center 27 of the roll 28 to its peripheral area 31. In this case, as in the above described embodiment of the method, the direction of the hole 33 can be not only inclined upward as figure 5, but in any convenient position, for example, inclined downward, vertical down, horizontal and so on (not shown).

Techno-economic advantages of the method of destruction of the massive cast-iron monolith - cost reduction and efficient use of the heat e is termicheskih reactions.

1. The method of destruction of the massive cast-iron monolith, including the establishment of the inside of the monolith uneven thermal stresses by drilling the borehole through thermal oxygen-Kopioi cutting with the gradual promotion of the oxygen lances inside of the monolith, wherein upon reaching the desired depth of hole stop further advancement of the oxygen lances inside the monolith and continue continuous supply of thermal energy through the formed hole, and carry out intense heat the inner part of the monolith without melting to his cracking due to the combustion of material of the oxygen lance.

2. The method according to claim 1, characterized in that carried out the destruction of the monolith in the form of exhaust cast iron mill roll, and the drilling of the hole produced in the diametrical direction to the longitudinal axis of the roll.

3. The method according to claim 2, characterized in that as the spear thermal oxygen-Kopioi use cutting tube in the cavity which are additional rods for burning.

4. The method according to claim 3, characterized in that the additional core feature along the entire length of the tube and deliver it in the form of a twisting of the several wires of circular cross section.

5. The method according to claim 2, characterized in that the drilling of the borehole using an oxygen lance without pfps is intellego rod inside the tube, and for intensive heating the inner part of the monolith using a second oxygen lance with additional rod inside the tube.

6. The method according to claim 1, characterized in that carried out the destruction of the monolith in the form of exhaust cast iron mill roll, as intense heating can arrange only one of the halves of the cross-section of the roll while drilling the borehole is produced so that a point burning spear in the hole was at the point of the hole, equidistant from the boundaries selected for warming up half of the cross-section of the roller.



 

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