Pre-assembly of blast furnace carbon blocks
For some important parts of blast furnaces and hot blast furnaces, whether pre-building is required can be determined based on the deviation of the external dimensions of the refractory bricks used; all combined bricks must be pre-assembled in the production plant.
Pre-assembly of carbon blocks is generally carried out layer by layer in the production plant. Before pre-assembly, the pre-assembly diagram of each layer of carbon blocks is drawn according to the design drawings and construction specifications, and the carbon blocks are numbered according to the construction sequence.
01 Fully paved furnace bottom
(1) Iron platform. The iron platform is 9m long and 1.3m wide, and its flatness deviation does not exceed 0.3mm.
(2) Length deviation of each group of carbon blocks (referring to the maximum design length): ±10mm for working end; ±20m for non-working end (the end surface in contact with the rough seam paste is called the non-working end).
If the length of a single carbon block in each row (group) is less than the specified size (within 150mm), it is allowed to be adjusted with the remaining carbon blocks in the group (row) to keep the total length of the group (row) unchanged, and each layer shall not exceed 6 rows.
The deviation in the width direction of each group (row) of carbon blocks is ±0.5mm.
(3) The gap of carbon blocks. When two carbon blocks are overlapped at an angle, the gap is not greater than 1mm when the ends of the two carbon blocks and the two sides are connected at right angles.
When two carbon blocks are overlapped at an angle, the projection length of the bevel is maintained at 100~130mm. (The angle of the bevel overlap is not controlled).
(4) Method for checking horizontal seams. Place the carbon block on the platform, and place a 1.3m long level ruler on the carbon block. Use a cold ruler to measure the gap between the platform and the carbon block and the carbon block level ruler. The lower horizontal gap is no more than 0.5mm, the upper horizontal gap is no more than 0.8mm, and the upper horizontal gap of the vertical charcoal block is no more than 1mm, and the lower horizontal gap is no more than 0.7mm. After passing the inspection, paint the center line and the connecting line between the charcoal blocks with paint.
02 Ring layer
(1) Check the horizontal and vertical gaps on the iron platform. Select a standard charcoal block as the mother block, and then place 3 adjacent charcoal blocks on both sides of it (each layer can be divided into two groups for inspection). Take away the qualified charcoal blocks from one side and add two blocks from the other side for inspection. The vertical gap between two adjacent charcoal blocks is no more than 1mm.
At any point on the top surface of the three adjacent charcoal blocks, place a 1.3m long horizontal ruler, and use a feeler gauge to measure the gap between the platform and the charcoal block and the charcoal block and the horizontal ruler. The lower horizontal gap is no more than 0.5mm, and the upper horizontal gap is no more than 0.8mm.
(2) Pre-assemble on the terrazzo platform. When laying the terrazzo platform, determine a firm center axis at the center point and draw multiple sets of mutually perpendicular cross lines on the table surface.
In the spring of each year, use a level to measure the level of the pre-assembled table.
(3) Pre-assembly diameter. Pre-assemble according to the diameter specified in the drawing. The deviation of the inner diameter of the ring after pre-assembly is ±20mm.
(4) Pre-assembly method. Place the mother block on the 0° line, and the center line of the mother block coincides with the 0° line. Then, lay qualified carbon blocks on one side (or both sides) in sequence and mark the serial numbers.
The starting method of the second layer of mother blocks is half a block width different from the previous layer, that is, the side of the mother block coincides with the 0° line. The starting method of the 3rd, 5th, 7th, etc. layers is the same as that of the 1st layer; the starting method of the 4th, 6th, 8th, etc. layers is alternate with the 2nd layer.
The inner circles of adjacent carbon blocks should not be offset from each other by more than the vertical seam distance of the upper and lower layers of carbon blocks, which should not be less than 40mm (except for the case where the number of carbon blocks in the iron mouth area or the upper and lower layers is not equal, and there is no adjustment of carbon blocks with extra-large cross-sections, and there is a double seam).
Deviation between the radial line and the side line of the carbon block: when the length of the carbon block is less than 1500mm, whether the large or small end exceeds 10mm; when the length of the carbon block is greater than or equal to 1500mm, whether the large or small end exceeds 15mm, the carbon block should be adjusted.
The positions of the upper and lower layers of the closing carbon blocks should not overlap. When the width of the closing carbon block is less than 1/4 of the standard block, the width of the left and right blocks of the closing can be used for adjustment (this block is not included in the number of adjustment blocks). The number of closing carbon blocks with the air outlet is equal to the number of air outlets.
The number of adjustment blocks in each annular layer shall not exceed 4. Adjustment blocks refer to carbon blocks whose width dimensions are not restricted by the drawing.
After every 3 to 5 layers of carbon block pre-assembly are completed, the quality inspection department of the production plant will draw a pre-assembly drawing, marking the layer number, serial number, control line, adjustment block, combined carbon block and other words.
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