CN102912050A - Material-ramming, mud-pressing and anti-freezing method for cooling wall of blast furnace in winter overhaul - Google Patents

Abstract

The invention relates to a cooling wall anti-freezing method for overhauling a blast furnace in winter, comprising the following steps: 1) using a hot blast stove to supply air to the blast furnace for heat preservation; 2) laying an insulation layer outside the blast furnace shell and setting up a heat preservation shed Insulation; 3) Use a temperature measuring gun to measure the temperature of the tamping place in the gap of the stave, and start construction after confirming that the temperature is above zero; 4) Start baking the blast furnace; 5) Use a temperature measuring gun to fully detect the temperature of the blast furnace skin, The cooling wall grouting preparation is started when the skin temperature is above 6 degrees; 6) Determine the grouting position between the stave and the blast furnace skin; 7) First weld the short pipe for pressing the hole at the grouting position, and then use the drilling machine to open the hole ; 8) Press the refractory material between the blast furnace shell and the cooling wall through the short tube. Compared with the existing technology, the invention has the beneficial effects of prolonging the service life of the blast furnace, ensuring the quality of the blast furnace overhaul in winter construction, promoting the normal production and operation of the blast furnace after the furnace is opened, and improving the economic benefits of the enterprise.

Description

Anti-freezing method of pounding and grouting cooling wall for overhaul of blast furnace in winter

technical field

The invention relates to the field of blast furnace smelting, in particular to a cooling wall pounding and grouting anti-freezing method for overhauling a blast furnace in winter.

Background technique

Due to the design defects of the blast furnace itself, the selection of refractory materials for the hearth, and the insufficient cooling capacity of the hearth area, the temperature of each part of the blast furnace rises rapidly, and even hearth burn-through accidents occur. Measures such as increasing the amount of cooling water, adding hearth heat flow intensity detection, using vanadium-titanium ore to protect the furnace, and making corresponding adjustments according to changes in the temperature field of the hearth, but with the prolongation of the furnace working time, abnormal erosion in the hearth area gradually Aggravated, the heat flow intensity in the hearth area of the iron mouth continues to rise, exceeding the warning value, and the blast furnace is forced to take measures such as reducing the smelting intensity, stopping oxygen enrichment, blocking the tuyere operation, and closing the air to cool the furnace, barely maintaining the low-level production of the blast furnace. To completely eliminate the safety hazards in the hearth area of the blast furnace, the blast furnace must be overhauled, but the overhaul of the blast furnace is never carried out in winter. The self-flowing castables in the gaps are easy to freeze during construction in cold weather, which will cause the ramming and grouting refractory materials to freeze and deteriorate, lose the original properties of the refractory materials, and affect the normal production and operation of the blast furnace and the life of the blast furnace after the furnace is turned on. It is necessary to continue to maintain low-level production, resulting in a reduction in corporate benefits, and at the same time there are potential safety hazards.

Contents of the invention

The object of the present invention is to provide a method for preventing self-flowing castables, ramming materials at caulking places and grouting refractory materials from freezing and deteriorating during the winter overhaul of blast furnaces, thereby effectively improving the service life and production efficiency of blast furnaces.

To achieve the above object, the present invention adopts the following technical solutions:

A cooling wall pounding and grouting anti-freezing method for overhauling a blast furnace in winter, comprising the following steps:

1) Use the hot blast stove to keep the air supply in the blast furnace to meet the temperature required for pounding materials in the gap of the cooling wall, so as to ensure that the materials for pounding materials will not be frozen and deteriorated;

2) Lay an insulation layer on the outside of the blast furnace shell, and set up a heat preservation shed for insulation, so as to ensure that the cold air does not enter or less enter the blast furnace;

3) Use a temperature measuring gun to measure the temperature at the tamping place in the gap of the cooling wall, and confirm that the temperature is above zero before construction can be started. If the temperature does not reach the temperature required for tamping, stop the work immediately, and strengthen the combustion of the small hot blast stove to improve the temperature in the furnace. temperature;

4) When the masonry of the blast furnace hearth is completed, the installation of staves is completed, and the gap between staves is pounded, start to bake the blast furnace;

5) Use a temperature measuring gun to fully detect the temperature of the furnace skin of the blast furnace, and start cooling wall grouting preparations when the temperature of the furnace skin is above 6 degrees;

6) Determine the grouting position between the stave and the blast furnace skin, the grouting position should be at the center of the four cooling plates between the sixth and seventh staves of the blast furnace;

7) When the blast furnace is shut down, first weld the short pipe for the press-in hole at the grouting part, and then use a drilling machine to open the hole. The diameter of the hole is generally Φ28mm or Φ35mm;

8) Press the refractory material between the blast furnace shell and the cooling wall through the short tube.

This method is also applicable to the following situations: 1) After the flange part of the cooling plate is replaced; 2) There is a blowing air channel on the back of the cooling wall; 3) The installation of the micro cooler; 4) The installation of the tuyere; 5) Partial maintenance of the furnace lining .

Compared with prior art, the beneficial effect of the present invention is:

A cooling wall ramming anti-freezing method for winter overhaul of a blast furnace, which effectively prevents the ramming of the joints between the cooling wall and the cooling wall, the self-flowing castable in the gap between the cooling wall and the blast furnace skin, and the refractory material freezing and deterioration, and prevents the refractory The material loses its original properties, which prolongs the service life of the blast furnace, ensures the quality of the blast furnace overhaul during winter construction, promotes the normal production and operation of the blast furnace after the furnace is opened, and improves the economic benefits of the enterprise.

Detailed ways

The specific embodiment of the present invention is further described below:

The invention discloses a winter overhaul cooling wall anti-freezing method for blast furnace, which comprises the following steps:

1) Use the hot blast stove to keep the air supply in the blast furnace to meet the temperature required for pounding materials in the gap of the cooling wall, so as to ensure that the materials for pounding materials will not be frozen and deteriorated;

2) Lay an insulation layer on the outside of the blast furnace shell, and set up a heat preservation shed for insulation, so as to ensure that the cold air does not enter or less enter the blast furnace;

3) Use a temperature measuring gun to measure the temperature at the tamping place in the gap of the cooling wall, and confirm that the temperature is above zero before construction can be started. If the temperature does not reach the temperature required for tamping, stop the work immediately, and strengthen the combustion of the small hot blast stove to improve the temperature in the furnace. temperature;

4) When the masonry of the blast furnace hearth is completed, the installation of staves is completed, and the gap between staves is pounded, start to bake the blast furnace;

5) Use a temperature measuring gun to fully detect the temperature of the furnace skin of the blast furnace, and start cooling wall grouting preparations when the temperature of the furnace skin is above 6 degrees;

6) Determine the grouting position between the stave and the blast furnace skin, the grouting position should be at the center of the four cooling plates between the sixth and seventh staves of the blast furnace;

7) When the blast furnace is shut down, first weld the short pipe for the press-in hole at the grouting part, and then use a drilling machine to open the hole. The diameter of the hole is generally Φ28mm or Φ35mm;

8) Press the refractory material between the blast furnace shell and the cooling wall through the short tube.

This method also applies to the following situations:

1) After the flange part of the cooling plate is replaced: When the cooling plate of the blast furnace is replaced by air leakage from the back, there is a gap around the cooling plate of the blast furnace. At this time, it is necessary to use this method to fill the gap with specific refractory materials to improve the cooling effect of the cooling plate of the blast furnace. Since the main purpose is to fill the gap in the blast furnace lining, it is only suitable for cooling plate blast furnaces.

2) There is a blowing air channel on the back of the cooling stave: the cooling stave is installed inside the blast furnace shell, and there is a certain gap between the installed cooling stave and the furnace shell. Filling with refractory materials, if these gaps still exist after the normal production of the blast furnace, a channel of blowing air will be formed on the back of the cooling wall, causing the furnace shell to turn red. The material is filled into the gap at the back of the stave to reduce and eliminate the back channeling of the stave.

3) Installation of micro-cooler: When the cooling equipment installed on the blast furnace body is insufficiently designed, the production load is increased, or the cooling equipment is damaged, the comprehensive cooling strength of the furnace body cannot adapt to the heat load of the furnace body, and the furnace lining is corroded. Intensified, even the furnace shell is red, which directly affects the service life of the furnace body. At this time, the more effective method is to install a micro-cooler on the furnace body to supplement the cooling strength of the furnace body. The hole drilled on the furnace shell is used to press the refractory material with lining repair performance into the furnace to achieve the purpose of repairing the furnace lining.

4) Installation of tuyeres: Due to the consideration of the expansion of the furnace lining, expansion gaps are generally provided during the installation of tuyeres and filled with buffer fillers. After the blast furnace is baked and put into production, if these reserved expansion gaps are not fully absorbed, Then it may become the channel of high-temperature gas. In order to block these channels, it is necessary to use this method to press specific refractory materials into the large or middle sleeve of the tuyere to achieve the purpose of blocking the channel.

5) Partial maintenance of the furnace lining: After the blast furnace has been used for a long time, the lining of the blast furnace is continuously thinned due to the wear of the furnace charge, chemical erosion and thermal stress. In severe cases, the local furnace shell is red or even directly exposed to the furnace charge. For this kind of local maintenance, it is a better way to use this method for maintenance, that is, the so-called press-in lining. This press-in method is divided into ordinary press-in and hard press-in. It should be noted that using this There is a prerequisite for this press-in operation: that is, there is a charge in the press-in position, and the charge has not been melted.

Claims (2)

1. blast furnace overhaul in a winter cooling stave is smash material mud jacking means to prevent freezing, it is characterized in that, may further comprise the steps:

1) with hotblast stove to the insulation of blowing in the blast furnace, satisfy the cooling stave slit and smash needed temperature of when material, guarantee to smash the material material and do not endure cold rotten;

2) lay thermal insulation layer last furnace shell is outside, and set up warming canopy and be incubated, guarantee that cold gas stream does not enter or enters less in the State of Blast Furnace;

3) with temperature-measuring gun the material place is smash in the cooling stave slit and carry out thermometric, confirm to construct on the zero temperature, if temperature does not reach and smashes the needed temperature of material and stop work immediately, strengthen little Combustion of Hot Air Furnace, to improve temperature in the stove;

4) when blast furnace hearth build by laying bricks or stones complete, cooling stave installs smashes material when complete with the cooling stave slit, begins to toast blast furnace;

5) with temperature-measuring gun complete detection shell of blast furnace temperature, treat that beginning to carry out the cooling stave mud jacking more than stove skin temperature 6 degree prepares;

6) determine mud jacking position between cooling stave and the shell of blast furnace, four cooling plate central positions that the mud jacking position should be between the 6th in blast furnace and the 7th cooling stave;

7) when blast furnace staying, at first welding is pressed into the hole short tube at the mud jacking position, then adopts the drilling machine perforate, and opening diameter is Φ 28mm or Φ 35mm;

8) by short tube refractory materials is pressed between last furnace shell and the cooling stave.

2. a kind of blast furnace overhaul in winter cooling stave according to claim 1 is smash material mud jacking means to prevent freezing, it is characterized in that, present method also is applicable to following situation: after 1) the cooling plate flange portion is changed; 2) the wind passage is altered at the cooling stave back; 3) installation of micro cooler; 4) installation in air port; 5) lining of shaft is local safeguards.