CN110779326A - Rotary cement kiln refractory brick mechanism and construction method - Google Patents

Abstract

The invention discloses a rotary cement kiln refractory brick mechanism and a construction method, wherein a spinel brick or a silicon mullite brick is laid on the inner wall of the rotary cement kiln refractory brick mechanism, and the size of a B622 type spinel brick is as follows: the big head is 74mm thick, and the small head is 69mm thick; the size of the B322 type spinel brick is as follows: the thickness of the big head is 76.5mm, and the thickness of the small head is 66.5 mm; the dimensions of the type 622 silicon mullite brick are as follows: the big head is 103mm thick, and the small head is 95.5mm thick; the 422 type silicon mullite brick has the following dimensions: the big head is 103mm thick, and the small head is 91.5mm thick; 201 spinel bricks per ring, 145 silicon mullite bricks per ring; 1-2 steel plates are added in each ring of spinel bricks, 6-12 steel plates are added in each ring of silicon mullite bricks, and the steel plates are A3 steel plates with the thickness of 3 mm. The rotary cement kiln refractory brick mechanism can effectively prevent the phenomena of swab drawing or brick falling of the high-alumina refractory bricks.

Description

Rotary cement kiln refractory brick mechanism and construction method

Technical Field

The invention relates to rotary cement kiln refractory bricks, in particular to a rotary cement kiln refractory brick mechanism and a construction method.

Background

The existing rotary cement kiln uses refractory bricks which are generally divided into two types of brick with different design standards and sizes, the difference of the thermal expansion coefficients is large at the same temperature, the thermal expansion coefficient of the high-alumina refractory bricks is very small, and the production stop risk exists in the operation process; the specific reason is that the high-alumina refractory bricks have smaller thermal expansion than the cylinder body and are not matched with the thermal expansion of the kiln cylinder body, so that the expansion allowance of the bricks is generated; the corrosion oxidation deformation flatness of the kiln barrel body does not reach the standard, the large face and large head flatness deviation of the brick, the particle rough face and the like are influenced, so that the large head (cold face) of the brick is separated from the barrel body, the stress is unstable, a gap is generated by friction between the brick and the brick, the phenomena of drawing or brick dropping are easy to occur, and the shutdown and production stop of the kiln are possibly caused.

For the abnormity of the high-alumina refractory bricks used in the rotary kiln, the defects of small expansion coefficient, masonry and the like are mainly overcome, when the refractory bricks are built, fire clay is usually filled between brick joints to level out the large surface unevenness of the bricks and the bricks are compact, the expansion amount cannot be compensated better, and the phenomena of brick falling or label drawing cannot be effectively solved.

Disclosure of Invention

The invention aims to provide a rotary cement kiln refractory brick mechanism and a construction method, wherein the rotary cement kiln refractory brick mechanism can effectively prevent the phenomenon of swab pulling or brick falling of a high-alumina refractory brick, and meanwhile, the construction method has the advantage of convenience in construction.

In order to achieve the purpose, the invention provides a rotary cement kiln refractory brick mechanism, wherein a spinel brick or a silicon mullite brick is laid on the inner wall of the rotary cement kiln refractory brick mechanism, and the size of a B622 type spinel brick is as follows: the big head is 74mm thick, and the small head is 69mm thick; the size of the B322 type spinel brick is as follows: the thickness of the big head is 76.5mm, and the thickness of the small head is 66.5 mm; the dimensions of the type 622 silicon mullite brick are as follows: the big head is 103mm thick, and the small head is 95.5mm thick; the 422 type silicon mullite brick has the following dimensions: the big head is 103mm thick, and the small head is 91.5mm thick; the dry-masonry proportion of each ring of the B622 type spinel brick and the B322 type spinel brick is 126: 75; the dry-masonry proportion of each ring of 622 type silicon mullite bricks and 422 type silicon mullite bricks is 622: 422; 201 spinel bricks per ring, 145 silicon mullite bricks per ring; 1-2 steel plates are added in each ring of spinel bricks, 6-12 steel plates are added in each ring of silicon mullite bricks, and the steel plates are A3 steel plates with the thickness of 3 mm.

Preferably, the steel sheet satisfies the following condition: the length is 200mm, and the width is 180 mm; a gouging with a width of 20mm is provided along one side in the length direction.

Preferably, 2 steel plates are additionally arranged in each ring of spinel bricks, and 8 steel plates are additionally arranged in each ring of silicon mullite bricks;

8 steel plates in each ring of silicon mullite bricks are arranged in the upper half ring, two sealing reinforcing steel plates are arranged in the sealing area, and 3 filling steel plates are respectively distributed and filled below the sealing area and on two sides above the bottoming interface; the number of bricks between two adjacent sealing reinforcing steel plates is 8-14, the number of bricks between two adjacent filling steel plates is 8-10, and no steel plate is filled between 6-8 above the bottoming interface.

Preferably, the steel plates provided in each ring of silicon mullite bricks are symmetrically arranged about a vertical plane.

Preferably, the compensation amount per steel sheet is 1mm at a kiln internal temperature of 1200 ℃.

Preferably, the spinel brick or the siliceous mullite brick both satisfy the following conditions: the height is 220mm and the length is 198 mm.

Preferably, when the temperature in the kiln is 1200 ℃, the magnesia-alumina spinel brick meets the following conditions: the temperature of the small head (hot surface) is 1200 ℃, the expansion rate of the small head is 1.54 percent, the temperature of the big head (cold surface) is 450 ℃, and the expansion rates are respectively 0.48 percent of the big head; the silicon mullite brick meets the following conditions: the temperature of the small head (hot surface) is 1200 ℃, the expansion rate of the small head is 0.68 percent, the temperature of the big head (cold surface) is 450 ℃, and the expansion rate of the big head is 0.2 percent.

Preferably, the magnesia-alumina spinel is a spinel VDZ type, and the silica mullite brick is a silica mullite brick ISO type brick.

The invention provides a construction method of rotary cement kiln refractory bricks, wherein 1-2 steel plates are additionally arranged in each ring of spinel bricks, 6-12 steel plates are additionally arranged in each ring of silicon mullite bricks, and the steel plates are A3 steel plates with the thickness of 3 mm; wherein, the size of the B622 spinel brick is as follows: the big head is 74mm thick, and the small head is 69mm thick; the size of the B322 type spinel brick is as follows: the thickness of the big head is 76.5mm, and the thickness of the small head is 66.5 mm; the dimensions of the type 622 silicon mullite brick are as follows: the big head is 103mm thick, and the small head is 95.5mm thick; the 422 type silicon mullite brick has the following dimensions: the big head is 103mm thick, and the small head is 91.5mm thick; the dry-masonry proportion of each ring of the B622 type spinel brick and the B322 type spinel brick is 126: 75; the dry-masonry proportion of each ring of 622 type silicon mullite bricks and 422 type silicon mullite bricks is 622: 422.

in the above technical solution, the inventor knows through creative work: because the steel plate has higher elastic modulus and thermal expansion coefficient, plastic deformation occurs at 450 ℃, oxidation occurs at 800 ℃, and the expansion compensation amount is about 1/3 at 1000 ℃; the normal temperature compressive strength of the high-alumina refractory brick is more than 55MPa at 1000 ℃, and is not affected. The shape size of the high-alumina brick is ISO standard, the size difference of the 422 brick big and small ends is 11.5mm, and the 622 brick is 7.5 mm; in comparison, 622 bricks are more prone to draw lots or drop bricks. The inventor of the invention can effectively compensate the expansion amount of the refractory bricks by assuming the steel plate in the spinel brick or the silicon mullite brick, and further can effectively prevent the brick falling or the drawing phenomenon of the refractory bricks.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic structural diagram of a preferred embodiment of a rotary cement kiln firebrick mechanism provided by the present invention;

FIG. 2 is a schematic structural view of a preferred embodiment of the steel plate of FIG. 1;

FIG. 3 is a schematic structural view of a preferred embodiment of the refractory brick of FIG. 1;

FIG. 4 is a schematic view showing the distribution of refractory bricks in a production line for producing 5000t/d clinker in a bituminous coal rotary kiln per day;

FIG. 5 is a drawing of the draw of refractory bricks found during service.

Description of the reference numerals

1. A sealing reinforcing steel plate 2 and a filling steel plate.

Detailed Description

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

In the present invention, unless otherwise specified, the directional words "upper, lower" and the like included in the terms merely represent the orientation of the terms in the conventional use state or are colloquially known by those skilled in the art, and should not be construed as limiting the terms.

The invention provides a rotary cement kiln refractory brick mechanism, wherein a spinel brick or a silicon mullite brick is laid on the inner wall of the rotary cement kiln refractory brick mechanism, and the size of a B622 type spinel brick is as follows: the big head is 74mm thick, and the small head is 69mm thick; the size of the B322 type spinel brick is as follows: the thickness of the big head is 76.5mm, and the thickness of the small head is 66.5 mm; the dimensions of the type 622 silicon mullite brick are as follows: the big head is 103mm thick, and the small head is 95.5mm thick; the 422 type silicon mullite brick has the following dimensions: the big head is 103mm thick, and the small head is 91.5mm thick; the dry-masonry proportion of each ring of the B622 type spinel brick and the B322 type spinel brick is 126: 75; the dry-masonry proportion of each ring of 622 type silicon mullite bricks and 422 type silicon mullite bricks is 622: 422; 201 spinel bricks per ring, 145 silicon mullite bricks per ring; 1-2 steel plates are added in each ring of spinel bricks, 6-12 steel plates are added in each ring of silicon mullite bricks, and the steel plates are A3 steel plates with the thickness of 3 mm.

Taking a 5000t/d production line as an example, a 34 m position is a boundary position of two brick types and is also an excessive position of the thickness of the cylinder body, and the expansion of the refractory bricks and the expansion of the cylinder body are asynchronous. According to the display of an operation cylinder scanner, the external temperature of the spinel brick of the cylinder body is 340 ℃, the external temperature of the silicon mullite brick is 310 ℃, and the temperature in the kiln is 1200 ℃ for calculation:

A. the expansion amount of the cylinder body at the positions of the spinel brick and the silicon mullite brick is as follows:

the expansion of the cylinder body = pi d α l, pi is the circumferential rate, d is the diameter of the cylinder body, α l is the linear expansion coefficient of the cylinder body (the material of the cylinder body of the kiln is generally Q235 carbon steel, and the general coefficient is 1.2 multiplied by lO-5/DEG C).

1) At 350 ℃, pi d α l =4.8 × 3.1415926 × 1.2 × (lO) ^-5）×350=63.33mm

2) At 320 ℃, pi d α l =4.8 × 3.1415926 × 1.2 × (lO) ^-5）×320=57.91mm

B. Gap length of each ring of bricks:

1) when spinel VDZ type brick is dry-laid, each ring of 201 bricks have a brick joint of about 0.3-0.5mm, the average value is 0.4mm, and the brick joint amount is as follows: 201 × 0.4mm =80.4 mm.

2) When the silicon mullite ISO-type brick is wet-laid, each ring is 145 bricks, and when the brick is wet-laid, the brick gap is 0.1mm, so that the length of the silicon mullite gap is 14.5 mm.

C. Calculating the expansion amount of each ring of bricks:

however, when the temperature in the kiln is 1200 ℃, the corresponding expansion rates of the small head (hot surface) and the large head (cold surface) of the magnesia-alumina spinel brick are respectively 0.48 percent of the large head and 1.54 percent of the small head (hot surface) when the small head (hot surface) of the magnesia-alumina spinel brick is 1200 ℃. The small head (hot surface) of the silicon mullite brick is 1200 ℃, the large head (cold surface) is 450 ℃, and the corresponding expansion rates are 0.2% of the large head and 0.68% of the small head (hot surface);

the expansion amount of each ring of dry masonry of the spinel brick is as follows:

b622, big head: 74mm, small end: 69 mm; b322: big head: 76.5mm, small end: 66.5 mm; the dryout ratio is about B622: B322=126: 75.

Large head expansion: (B622 × 126+ B322 × 75) × 0.48% = (74 × 126+76.5 × 75) × 0.48% =72.30mm

Small end swelling amount: (B622 × 126+ B322 × 75) × 1.54% = (69 × 126+66.5 × 75) × 1.54% =210.7mm

The expansion measurement takes an intermediate value, namely: (72.3 + 210.7)/2 =141.5mm

The expansion amount of each ring of dry bricking of the silicon mullite brick is as follows:

622, big head: 103mm, small end: 95.5 mm; 422: big head: 103mm, small end: 91.5 mm; the dryout ratio is about 622:422=75: 71.

Large head expansion: (622 × 75+422 × 71) × 0.2% = (95.5 × 71+91.5 × 74) × 0.2% =27.1mm

Small end swelling amount: (622 × 75+422 × 71) × 0.68% = (95.5 × 71+91.5 × 74) × 0.68% =92.15mm

The expansion measurement takes an intermediate value, namely: (27.1 + 92.15)/2 =59.63mm

D. According to the thermal expansion allowance at 1200 ℃ in the kiln

The expansion allowance of the spinel brick is as follows: gap amount + barrel thermal expansion amount-brick expansion amount =80.4+63.33-141.5=2.23mm

Silicon mullite brick expansion allowance: gap amount + barrel thermal expansion amount-brick expansion amount =14.5+57.91-59.63=12.78mm

According to the calculation result, the expansion amount of the spinel brick meets the expansion of the cylinder body, the allowance is 2.23mm, and the expansion compensation amount is 2mm at 1000 ℃ in a hot state according to the calculation of adding two steel plates to each ring of brick. Just meets the requirements. And the expansion amount of the silicon mullite brick is far less than that of the cylinder body, the allowance is larger, 6-12 steel plates are required to be added in advance, and the steel plates are used for thermal expansion compensation in a hot state, so that the purposes of synchronizing the expansion of the refractory brick and the cylinder body and preventing the brick from being drawn and dropped are achieved.

In the above embodiment, the specification of the steel sheet can be selected within a wide range, but in order to further improve the expansion ratio compensation effect of the steel sheet, it is preferable that the steel sheet satisfies the following conditions: the length is 200mm, and the width is 180 mm; a gouging with a width of 20mm is provided along one side in the length direction. The arrangement of the planing port can further facilitate the laying of the steel plate.

In the present invention, the amount of compensation of the steel sheet can be selected within a wide range, but it is preferable that the amount of compensation per steel sheet is 1mm at a kiln internal temperature of 1200 ℃.

In the above embodiment, the number of steel plates and the laying position can be selected within a wide range, and preferably, 2 steel plates are added in each ring of spinel bricks, and 8 steel plates are added in each ring of silicon mullite bricks; 8 steel plates in each ring of silicon mullite bricks are arranged in the upper half ring, two sealing reinforcing steel plates 1 are arranged in a sealing area, and 3 filling steel plates 2 are respectively distributed and filled below the sealing area and on two sides above the bottoming interface; the number of bricks between two adjacent sealing reinforcing steel plates 1 is 8-14, the number of bricks between two adjacent filling steel plates 2 is 8-10, and no steel plate is filled between 6-8 above the paving bottom interface. Therefore, the expansion amount of the refractory bricks can be effectively compensated by adding 2 steel plates in each ring of spinel bricks and 8 steel plates in each ring of silicon mullite bricks; and meanwhile, the strength of the kiln can be further improved by optimizing the position of the steel plate.

In the above embodiment, in order to further stably compensate for the expansion amount, it is preferable that the steel plates provided in each ring of the silicon mullite brick are symmetrically provided with respect to the vertical plane.

In the present invention, the specification of the refractory brick can be selected within a wide range, but in order to further improve the strength and the service life of the rotary cement kiln, it is preferable that the spinel brick or the mullite brick satisfy the following conditions: the height is 220mm and the length is 198 mm.

In the present invention, the expansion performance of the refractory brick can be selected within a wide range, but in order to further improve the strength and the service life of the rotary cement kiln, it is preferable that the magnesia-alumina spinel brick satisfies the following conditions at a kiln internal temperature of 1200 ℃: the temperature of the small head (hot surface) is 1200 ℃, the expansion rate of the small head is 1.54 percent, the temperature of the big head (cold surface) is 450 ℃, and the expansion rates are respectively 0.48 percent of the big head; the silicon mullite brick meets the following conditions: the temperature of the small head (hot surface) is 1200 ℃, the expansion rate of the small head is 0.68 percent, the temperature of the big head (cold surface) is 450 ℃, and the expansion rate of the big head is 0.2 percent.

In the present invention, the material of the refractory brick can be selected from a wide range, but in order to further improve the strength and the service life of the rotary cement kiln, it is preferable that the magnesia alumina spinel is of a spinel VDZ type, and the silica brick is of a silica brick ISO type.

The invention provides a construction method of rotary cement kiln refractory bricks, wherein 1-2 steel plates are additionally arranged in each ring of spinel bricks, 6-12 steel plates are additionally arranged in each ring of silicon mullite bricks, and the steel plates are A3 steel plates with the thickness of 3 mm;

wherein, the size of the B622 spinel brick is as follows: the big head is 74mm thick, and the small head is 69mm thick; the size of the B322 type spinel brick is as follows: the thickness of the big head is 76.5mm, and the thickness of the small head is 66.5 mm; the dimensions of the type 622 silicon mullite brick are as follows: the big head is 103mm thick, and the small head is 95.5mm thick; the 422 type silicon mullite brick has the following dimensions: the big head is 103mm thick, and the small head is 91.5mm thick; the dry-masonry proportion of each ring of the B622 type spinel brick and the B322 type spinel brick is 126: 75; the dry-masonry proportion of each ring of 622 type silicon mullite bricks and 422 type silicon mullite bricks is 622: 422.

the preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (9)

1. The rotary cement kiln refractory brick mechanism is characterized in that spinel bricks or silicon mullite bricks are laid on the inner wall of the rotary cement kiln refractory brick mechanism, and the size of the B622 type spinel bricks is as follows: the big head is 74mm thick, and the small head is 69mm thick; the size of the B322 type spinel brick is as follows: the thickness of the big head is 76.5mm, and the thickness of the small head is 66.5 mm; the dimensions of the type 622 silicon mullite brick are as follows: the big head is 103mm thick, and the small head is 95.5mm thick; the 422 type silicon mullite brick has the following dimensions: the big head is 103mm thick, and the small head is 91.5mm thick; the dry-masonry proportion of each ring of the B622 type spinel brick and the B322 type spinel brick is 126: 75; the dry-masonry proportion of each ring of 622 type silicon mullite bricks and 422 type silicon mullite bricks is 622: 422; 201 spinel bricks per ring, 145 silicon mullite bricks per ring; 1-2 steel plates are added in each ring of spinel bricks, 6-12 steel plates are added in each ring of silicon mullite bricks, and the steel plates are A3 steel plates with the thickness of 3 mm.

2. The rotary cement kiln firebrick mechanism as recited in claim 1, wherein the steel plate satisfies the following conditions: the length is 200mm, and the width is 180 mm; a gouging with a width of 20mm is provided along one side in the length direction.

3. The rotary cement kiln firebrick mechanism as claimed in claim 1, wherein 2 steel plates are added to each ring of spinel bricks, and 8 steel plates are added to each ring of silicon mullite bricks;

8 steel plates in each ring of silicon mullite bricks are arranged in the upper half ring, two sealing reinforcing steel plates are arranged in the sealing area, and 3 filling steel plates are respectively distributed and filled below the sealing area and on two sides above the bottoming interface; the number of bricks between two adjacent sealing reinforcing steel plates is 8-14, the number of bricks between two adjacent filling steel plates is 8-10, and no steel plate is filled between 6-8 above the bottoming interface.

4. The rotary cement kiln brick mechanism according to claim 1, wherein the steel plates provided in each ring of silicon mullite bricks are symmetrically arranged about a vertical plane.

5. The rotary cement kiln firebrick mechanism as recited in claim 1, wherein the offset per steel plate is 1mm at a kiln internal temperature of 1200 ℃.

6. The rotary cement kiln fire brick mechanism according to claim 1, wherein the spinel brick or the silicon mullite brick meet the following conditions: the height is 220mm and the length is 198 mm.

7. The rotary cement kiln brick mechanism according to claim 1, wherein the magnesia-alumina spinel brick satisfies the following conditions at a kiln temperature of 1200 ℃: the temperature of the small head (hot surface) is 1200 ℃, the expansion rate of the small head is 1.54 percent, the temperature of the big head (cold surface) is 450 ℃, and the expansion rates are respectively 0.48 percent of the big head; the silicon mullite brick meets the following conditions: the temperature of the small head (hot surface) is 1200 ℃, the expansion rate of the small head is 0.68 percent, the temperature of the big head (cold surface) is 450 ℃, and the expansion rate of the big head is 0.2 percent.

8. The rotary cement kiln fire brick mechanism according to claim 1, wherein the magnesia alumina spinel is of spinel VDZ type and the silica mullite brick is of silica mullite brick ISO type.

9. The construction method of the rotary cement kiln refractory brick is characterized in that 1-2 steel plates are additionally arranged in each ring of spinel bricks, 6-12 steel plates are additionally arranged in each ring of silicon mullite bricks, and the steel plates are A3 steel plates with the thickness of 3 mm;

wherein, the size of the B622 spinel brick is as follows: the big head is 74mm thick, and the small head is 69mm thick; the size of the B322 type spinel brick is as follows: the thickness of the big head is 76.5mm, and the thickness of the small head is 66.5 mm; the dimensions of the type 622 silicon mullite brick are as follows: the big head is 103mm thick, and the small head is 95.5mm thick; the 422 type silicon mullite brick has the following dimensions: the big head is 103mm thick, and the small head is 91.5mm thick; the dry-masonry proportion of each ring of the B622 type spinel brick and the B322 type spinel brick is 126: 75; the dry-masonry proportion of each ring of 622 type silicon mullite bricks and 422 type silicon mullite bricks is 622: 422.

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