SU806766A1 - Method of reconsructing casing of preferably blast furnace - Google Patents

Description

The invention relates to the construction, namely the installation of sheet shells such as casings of blast furnaces.

There is a method of reconstruction of a mine shaft of a blast furnace, in which a complete replacement of a casing that has become unusable is carried out. Moreover, the technological scheme of reconstruction work, which provides for the complete elimination of the old casing and the construction of a new casing in its place, leads to the fact that, along with the replacement of the destroyed casing, it is also necessary to completely replace the refractory lining and cooling equipment, despite the fact that the latter can remain in satisfactory condition and can be used during further operation 11].

However, this method is very uneconomical, as it is associated with excessive costs of materials and the time required to carry out the entire complex of reconstruction work.

Also known is a Method of reconstruction of a furnace casing by erecting an additional casing with the removal of pipe fittings 12],

However, this method has several disadvantages. So, for example, if it is used, when cooling equipment is installed inside the casing close to it, such as in the cooled area of a blast furnace, it is necessary to remove and replace the cooling pipe fittings or all cooling equipment or to reconstruct the casing only partially, which leads to its unevenness , while significantly reducing the reliability of both the casing itself and the lining masonry. In addition, the reconstruction by indentation of the cut-out part into the body can lead to the destruction of the refractory layer adjacent to the casing.

The purpose of the invention is to reduce the cost of reconstruction and reduce its terms, as well as providing the possibility of using preserved structural elements.

This goal is achieved by the fact that in the method of reconstructing the casing of a predominantly blast furnace by erecting an additional casing with removal of pipe fittings, before erecting an additional casing, the pipe fittings are removed and fixing elements are installed on the repaired part of the casing, and the construction of the additional casing is performed by element-wise assembly from the bottom up a gap to the reconstructed casing, with simultaneous laying in the gap of thermal insulation and connection as e cut formed in the additional casing of the pipe fittings, after which the upper parts of both casings are connected to each other and seal the sections at the junction of the pipe fittings.

In FIG. 1 is a cross-sectional view of a repaired blast furnace; in FIG. 2 - node J in FIG. 1.

The method is as follows.

In places of the worn part of the old reconstructed casing 1, the pipes 2 of the cooling pipe fittings are removed, which discharge and supply water to the refrigeration equipment 3 installed on the inside of the casing. On the worn part of the casing with the lining 4 preserved, support elements 5 are installed, which are necessary for mounting metal sheets forming the second additional casing 6. Supporting elements allow a certain gap to be created between the worn and new metal casings, as well as to ensure high-quality fitting and welding of the installed sheets forming additional casing.

Installation of metal sheets is carried out from the bottom up. As the construction of an additional casing through the holes cut into it, the previously cut pipes of the pipe fittings are connected. From the outside, 7 pipes are sealed by electric welding. The gap 'between the worn part of the casing and the new casing is filled with a heat-insulating layer 8 of refractory material, for example chamotte-cement mass. Then, in the upper part of the casing to be preserved, fixing elements similar to the lower ones are installed, black $. which an additional metal casing is rigidly attached to the stored casing.

The proposed method allows you to maintain a satisfactory condition of the cooling equipment and refractory lining, which are fixed on the parts of the worn casing of the blast furnace to be replaced, which, in turn, allows to reduce the time it stops and get significant savings in material and labor costs. In addition, the installed additional casing can subsequently be used as the main casing for fixing cooling equipment on it and lining the blast furnace with an increase in its volume to 8%.

Claims (2)

The housing casing removes piping fittings and installs fixing elements on the repaired part of the casing, and erecting the additional casing is performed by element-by-element assembly from the bottom upwards with a gap to the reconstructed casing, simultaneously with thermal insulation in the gap and connected as they are erected through holes formed in the additional casing. pipe fittings, after which the tops of both housings are interconnected and seal the sections where the pipes adjoin it wire reinforcement. FIG. 1 shows the repaired domain furnace cross section in FIG. 2 — node) in FIG. 1. The process is carried out in the following manner. In the places of the worn-out part of the old reconstructed housing 1, the branch pipes 2 of the cooling pipeline fittings are removed, which discharge and supply water to the refrigeration equipment 3 installed on the inner side of the housing. On the worn-out part of the casing with the retained lining 4, the supporting elements 5 are installed, which are necessary for mounting the metal sheets forming the second additional casing 6. Pouring vlh sheets forming an additional housing. Installation of metal sheets is made from bottom to top. As the additional casing is erected, the previously cut off pipe fittings are connected through the versts cut into it. On the outer side, 7 nozzles are sealed by electric welding. The gap between the worn part of the casing and the new casing is filled with a heat insulating layer 8 of refractory material, such as chamotte-cement mass, s. Then, in the upper part of the preserved casing, similar lower fixing elements are installed, 4epj83 .. which an additional metal casing is rigidly attached to the retained casing. The proposed method allows to maintain satisfactory cooling equipment and refractory lining, which are fixed in the areas of the worn-out blast furnace casing to be replaced, which, in turn, reduces its stopping time and results in significant cost and material savings. In addition, the installed additional casing can subsequently be used as the main one for fixing cooling equipment on it and lining the blast furnace with an increase in its volume up to 8%. Claims The method of reconstruction of the casing of a predominantly blast furnace by the construction of an additional casing with the removal of pipeline valves, characterized in that, in order to reduce the cost of reconstruction and reduce its time, as well as to ensure the use of the remaining structural elements, before the construction of the additional casing, the valves are removed and installation of fixing elements on the repaired part of the casing, and the construction of an additional casing produces t by the element-by-element assembly from bottom to top with a gap to the 1st housing being reconstructed, with the thermal insulation being placed in the gap and connected as it is erected through the holes in the pipeline fittings formed in the additional housing, after which the upper parts of both covers are interconnected and the sections are sealed in place adjoining it to pipeline fittings. Sources of information taken into account in the examination, 1. USSR author's certificate No. 581146, cl. From 21 to 9/00, 1975. 2. Japanese Patent 48-18683, cl. 10 A 52, 1973.