CN117658495A - Heat accumulating type double-chamber D-type roasting shaft kiln connecting channel - Google Patents
Heat accumulating type double-chamber D-type roasting shaft kiln connecting channel Download PDFInfo
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- CN117658495A CN117658495A CN202311488664.2A CN202311488664A CN117658495A CN 117658495 A CN117658495 A CN 117658495A CN 202311488664 A CN202311488664 A CN 202311488664A CN 117658495 A CN117658495 A CN 117658495A
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- Prior art keywords
- channel
- double
- kiln
- arch
- shaft kiln
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- 238000001354 calcination Methods 0.000 claims abstract description 17
- 238000005192 partition Methods 0.000 claims abstract description 11
- 239000011449 brick Substances 0.000 claims description 18
- 239000000463 material Substances 0.000 claims description 15
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 14
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000000835 fiber Substances 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 4
- 239000004411 aluminium Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000004568 cement Substances 0.000 claims description 4
- 239000004927 clay Substances 0.000 claims description 4
- 229910052596 spinel Inorganic materials 0.000 claims description 3
- 239000011029 spinel Substances 0.000 claims description 3
- 239000004615 ingredient Substances 0.000 claims description 2
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 230000001172 regenerating effect Effects 0.000 claims 4
- 210000000038 chest Anatomy 0.000 claims 2
- 238000010304 firing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002245 particle Substances 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 12
- 239000002344 surface layer Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 5
- 239000003546 flue gas Substances 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000019738 Limestone Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 239000006028 limestone Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 230000035939 shock Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 1
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 1
- 235000014380 magnesium carbonate Nutrition 0.000 description 1
- 239000001095 magnesium carbonate Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to the technical field of metallurgical building material production equipment, in particular to a heat accumulating type double-hearth D-type roasting shaft kiln connecting channel, which comprises a connecting channel body, wherein the connecting channel body is arranged between double-hearth kilns, the connecting channel is divided into a channel I and a channel II by side walls at the front side and the rear side and partition walls in the middle of the side walls, a double-layer upper arch is respectively arranged between each side wall and each partition wall, and two channel door arches of prefabricated roasting parts are respectively arranged at the left side and the right side of each channel; the bottoms of the first channel and the second channel are respectively provided with an inverted V-shaped bulge. The bottom of the channel adopts the V-shaped structure, so that the interval between two kiln bores can be reduced, small particles heated by calcination in the kiln bores are prevented from accumulating on the inclined plane of the bottom of the channel, the calcination quality is improved, and the whole service life of the shaft kiln is prolonged.
Description
Technical Field
The invention relates to the technical field of metallurgical building material production equipment, in particular to a heat accumulating type double-chamber D-type roasting shaft kiln connecting channel.
Background
The heat accumulating double-chamber vertical kiln is a light burning kiln for calcining limestone, dolomite, magnesite and other ores, and is a roasting kiln which has wide application, can reduce emission and save energy. The two kiln bores are alternately calcined and stored, namely one kiln bore is calcined, the other kiln bore stores heat, the two kiln bores begin to change direction after 12-30 minutes, and the two kiln bores are alternately used. The type of the double-hearth roasting kiln is a double-C type and a double-D type except a round double-hearth kiln, the round shape of the double-hearth lime kiln in China is from a Switzerland Maerz kiln type at present, the core structure of the kiln type is designed into a ring shape and a connecting channel, the heat utilization efficiency is greatly improved, but the defect is that the channel is easy to block and needs to be jacked for cleaning, refractory bricks at the channel position are extremely easy to damage and collapse so as to block the channel, and direct influence is caused on process control, product quality, the practical service life of refractory materials in the kiln and the like, so that the connecting channel with higher structural strength is explored, and the requirements for improving the service life of the kiln and the production efficiency are very high.
In the production process of the existing D-type double-hearth kiln, as shown in fig. 1, the bottom of the connecting channel is a bulge with a trapezoid cross section, when the kiln hearth is used for a long time, a stacking is easily formed at the bottom of the channel, so that the service life of the connecting channel is easily influenced by the damage of the lining brickwork due to long-time bearing high temperature, thermal shock change of the channel part, creep deformation, extrusion, low-melting etching peeling, solid material abrasion, steam erosion of a preheating zone and the like, the channel is damaged to a certain extent, the double-hearth kiln needs to be replaced by most of lining, and when the double-hearth kiln is replaced, the kiln is required to be stopped for maintenance, the lining is wholly dismantled and re-built, and the production progress is influenced.
Disclosure of Invention
The embodiment of the invention provides a heat accumulating type double-chamber D-type roasting shaft kiln connecting channel, which has the technical effects of improving shock resistance, heat stability, corrosion resistance, integrity, wear resistance and structural strength, ensuring smooth air flow between kiln chambers, improving kiln process conditions and prolonging the overall service life of the kiln.
In one aspect of the embodiment of the invention, a connection channel of a heat accumulating type double-hearth D-type roasting shaft kiln is provided, the connection channel comprises a connection channel body, the connection channel body is arranged between the double-hearth kiln, the connection channel is divided into a first channel and a second channel by side walls on the front side and the rear side and partition walls in the middle of the side walls, a double-layer upper arch is respectively arranged between each side wall and each partition wall, and two channel door arches of prefabricated roasting parts are respectively arranged on the left side and the right side of each channel; the bottoms of the first channel and the second channel are respectively provided with an inverted V-shaped bulge.
Compared with the prior art, the invention has the beneficial effects that:
the bottom of the channel in the invention adopts an inverted V-shaped structure, so that the space between D-shaped kiln bores is reduced as much as possible, and small particles heated by calcination in the kiln bores are prevented from piling on the inclined bottom surface of the channel and flowing downwards smoothly, thereby influencing the calcination quality of the materials; the end wall and the door arch are respectively added below the double-layer upper arch and respectively correspond to the two sides of each channel, so that the strength of the channel is improved; through the design of the inverted V-shaped structure at the bottom, the channel space is optimized, the smoothness of air flow between two kiln bores can be ensured, the ignition of double D kilns is facilitated, the ignition burner is enabled to burn more stably, and the kiln temperature rising process requirement is met.
Further, the invention adopts the following preferable scheme:
an end wall is arranged between the upper part of each side wall and the upper part of the partition wall respectively, and a prefabricated roasting piece double-channel door arch is arranged below the end wall.
The protruding surface course of passageway I and passageway II's bottom adopts the magnesiA-Alumina spinel to build by laying bricks or stones, and protruding inlayer adopts high aluminium brick to build into tower structure, and lower part notes material is low cement clay matter refractory castable between protruding surface course and the protruding inlayer, and the top curved surface notes material adopts the wear-resisting notes material of reinforcing high aluminium matter steel fiber between protruding surface course and the protruding inlayer.
The double-layer upper arch comprises a double-channel light high-alumina brick arch arranged above and a prefabricated roasting piece double-channel arch arranged below, and the prefabricated roasting piece double-channel arch and the prefabricated roasting piece double-channel door arch are respectively formed by adopting reinforced high-alumina steel fiber wear-resistant castable material ingredients for roasting.
The top of the inverted V-shaped bulge is of an arc-shaped structure.
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 application, illustrate and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a schematic view of a conventional roasting shaft kiln connecting channel;
FIG. 2 is a schematic diagram of the overall structure of the present invention;
FIG. 3 is a cross-sectional view A-A of FIG. 2;
FIG. 4 is a cross-sectional view taken along line 2-2 of FIG. 3;
FIG. 5 is a cross-sectional view B-B of FIG. 1;
in the figure: a convex surface layer 1; a convex inner layer 2; a material 3 is injected at the lower part between the convex surface layer and the convex inner layer; a material 4 is injected on the top curved surface between the convex surface layer and the convex inner layer; a side wall 5; an end wall 6; a prefabricated roasting piece double-channel top arch 7; a double-channel lightweight high-alumina brick top arch 8; a prefabricated roasting piece double-channel door arch 9; an arch brick 10; channel one 11; channel two 12; a partition wall 13.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. The exemplary embodiments of the present invention and the descriptions thereof are used herein to explain the present invention, but are not intended to limit the invention.
As shown in fig. 2 to 4:
the heat accumulating type double-hearth D-shaped roasting shaft kiln connecting channel mainly comprises a connecting channel body, wherein the connecting channel body is arranged between two hearth kilns and is used for communicating the two kilns.
The connecting channel is divided into a channel I11 and a channel II 12 by side walls 5 arranged on the front side and the rear side and a partition wall 13 arranged between the two side walls 5, the top of each side wall 5 and the top of the partition wall 13 are respectively provided with a double-layer upper arch, and in the embodiment, the double-layer upper arches are respectively a double-channel light high-alumina brick arch 8 arranged above and a prefabricated roasting part double-channel arch 7 arranged below.
The left and right sides at the top of passageway one 11 and passageway two 12 are provided with end wall 6 respectively, and the below of end wall 6 is provided with prefabricated calcination piece binary channels door arch 9.
In the embodiment, the prefabricated roasting part double-channel door arch 9 and the prefabricated roasting part double-channel top arch 7 are respectively prepared from reinforced high-alumina steel fiber wear-resistant pouring materials, are roasted and formed in a special roasting kiln, are built together with channel refractory bricks according to the requirements of the vertical shaft kiln building standard after reaching the corresponding physicochemical indexes and structural strength standards, and are subjected to strict control of brick joints and expansion joints, for example, the control of the brick joints is not more than 2mm, and the span of the expansion joints is strictly controlled according to the expansion coefficients determined by different refractory Li Hua standards as references.
In the embodiment, the prefabricated roasting part double-channel door arch 9, the prefabricated roasting part double-channel top arch 7 and the double-channel light high-alumina brick top arch 8 are all reinforced high-alumina bricks.
The bottoms of the first channel 11 and the second channel 12 are respectively provided with an inverted V-shaped bulge, the bulge surface layer 1 is built by adopting magnesiA-Alumina spinel bricks, the bulge inner layer 2 is in a tower structure built by adopting high-alumina bricks, the bulge surface layer and the lower part of the bulge inner layer are filled with low-cement clay (the lower part of the bulge surface layer and the bulge inner layer is filled with low-cement clay), and the bulge surface layer and the top curved surface of the bulge inner layer are filled with reinforced high-alumina steel fiber wear-resistant refractory casting materials 4.
In this embodiment, the inclination angle of the protruding surface layers on both sides of the inverted V-shaped protrusion is α, and the inclination angle should be reduced as much as possible, that is, the distance between the D-shaped kiln bores is reduced as much as possible, so that the length of the channel is reduced accordingly, and α in this embodiment is 15.16 °. Through the arrangement of the inverted V-shaped bulges, the small particle materials heated by calcination in the kiln chamber can smoothly flow downwards without being placed on the inclined bottom surface of the channel to form a stacker, so that the calcination quality of the materials is affected.
The structure and the calcination principle of the heat accumulating type double-hearth calcination shaft kiln are as follows:
the two kiln bores are respectively a calcination bore (namely kiln bore A) and a heat storage bore (namely kiln bore B), the calcination bore and the heat storage bore are communicated through a connecting channel body, and the working states of the two kiln bores are exchanged every 12 to 15 minutes.
The double-hearth roasting shaft kiln is advanced lime roasting equipment, and has two vertical kiln hearths, wherein the middle lower part of the kiln hearths is provided with two connecting channels for communicating the two kiln hearths, and the double-hearth kiln roasting process has two main characteristics: the co-current flow and heat accumulation are that when limestone is calcined, combustion products and limestone flow downwards together, so that high-quality active lime is calcined; the heat accumulation is that when the kiln chamber A is calcined, the calcined product, namely high-temperature flue gas, enters the kiln chamber B through two connecting channels at the middle and lower parts of the kiln chamber A, and after entering the kiln chamber B, the high-temperature flue gas flows upwards to preheat the limestone in the preheating zone to a higher temperature, and the process is equivalent to accumulating the heat of the flue gas in the preheating zone of the kiln chamber B, and the flue gas passing through the kiln chamber B is discharged out of the kiln chamber after being reduced to a very low temperature. The working principle fully utilizes the waste heat of the flue gas, and ensures that the kiln has high heat efficiency. The functions of calcining and heat accumulating of the two kiln bores of the double-hearth kiln are exchanged alternately.
The connecting channel body between the double-hearth roasting shaft kilns is an essential structure for realizing the advantages of a roasting principle and energy conservation and high heat efficiency. The effect of the connecting channel in this implementation is that make lime calcining kiln bore in the gas that produces in the calcination process climb to the protruding top of connecting channel body bottom inverted V style of calligraphy from calcining the bore and get into the heat accumulation kiln, and a large amount of dust that have in the flowing gas can fall at the bottom of passageway along with gas, because the setting of the protruding structure of channel bottom inverted V style of calligraphy in this embodiment, the dust can follow the inclined plane downwardly flowing of connecting channel body bottom surface course to prevent to pile up at connecting channel body bottom surface course.
The invention adopts a refractory material roasting prefabricated member combined with a refractory brick composite masonry structure, and has better thermal shock resistance stability, corrosion resistance, integrity, wear resistance and structural strength; after optimization, the integral strength of the connecting channel body is improved, the space of the connecting channel body is also increased, the smoothness of air flow between two kiln bores is ensured, the continuous and stable combustion of the ignition burner is ensured when the kiln is started by ignition, the process condition of the shaft kiln is improved, and the integral service life of the connecting channel is prolonged.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (5)
1. The utility model provides a two thorax D calcination shaft kiln connecting channels of heat accumulation formula, includes the connecting channel body, and the connecting channel body is arranged in between the two thorax kilns, its characterized in that: the connecting channel is divided into a channel I and a channel II by side walls at the front side and the rear side and partition walls in the middle of the side walls, a double-layer upper arch is respectively arranged between each side wall and each partition wall, and two channel door arches of the prefabricated roasting part are respectively arranged at the left side and the right side of each channel; the bottoms of the first channel and the second channel are respectively provided with an inverted V-shaped bulge.
2. The regenerative double-hearth D-type firing shaft kiln connection channel according to claim 1, wherein: an end wall is arranged between the upper part of each side wall and the upper part of the partition wall respectively, and a prefabricated roasting piece double-channel door arch is arranged below the end wall.
3. The regenerative double-bore shaft kiln connection channel of claim 1, wherein: the protruding surface course of passageway I and passageway II's bottom adopts the magnesiA-Alumina spinel to build by laying bricks or stones, and protruding inlayer adopts high aluminium brick to build into tower structure, and lower part notes material is low cement clay matter refractory castable between protruding surface course and the protruding inlayer, and the top curved surface notes material adopts the wear-resisting notes material of reinforcing high aluminium matter steel fiber between protruding surface course and the protruding inlayer.
4. The regenerative double-bore shaft kiln connection channel of claim 1, wherein: the double-layer upper arch comprises a double-channel light high-alumina brick arch arranged above and a prefabricated roasting piece double-channel arch arranged below, and the prefabricated roasting piece double-channel arch and the prefabricated roasting piece double-channel door arch are respectively formed by adopting reinforced high-alumina steel fiber wear-resistant castable material ingredients for roasting.
5. The regenerative double-bore shaft kiln connection channel of claim 1, wherein: the top of the inverted V-shaped bulge is of an arc-shaped structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311488664.2A CN117658495A (en) | 2023-11-09 | 2023-11-09 | Heat accumulating type double-chamber D-type roasting shaft kiln connecting channel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311488664.2A CN117658495A (en) | 2023-11-09 | 2023-11-09 | Heat accumulating type double-chamber D-type roasting shaft kiln connecting channel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117658495A true CN117658495A (en) | 2024-03-08 |
Family
ID=90085420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311488664.2A Pending CN117658495A (en) | 2023-11-09 | 2023-11-09 | Heat accumulating type double-chamber D-type roasting shaft kiln connecting channel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117658495A (en) |
-
2023
- 2023-11-09 CN CN202311488664.2A patent/CN117658495A/en active Pending
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