CN114181719A - Large coke oven building and building process - Google Patents
Large coke oven building and building process Download PDFInfo
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- CN114181719A CN114181719A CN202111129998.1A CN202111129998A CN114181719A CN 114181719 A CN114181719 A CN 114181719A CN 202111129998 A CN202111129998 A CN 202111129998A CN 114181719 A CN114181719 A CN 114181719A
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- 239000000571 coke Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000008569 process Effects 0.000 title claims abstract description 23
- 239000011449 brick Substances 0.000 claims abstract description 317
- 239000010410 layer Substances 0.000 claims abstract description 145
- 238000010276 construction Methods 0.000 claims abstract description 25
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 17
- 239000011465 paving brick Substances 0.000 claims abstract description 9
- 238000009413 insulation Methods 0.000 claims abstract description 8
- 239000012791 sliding layer Substances 0.000 claims abstract description 8
- 238000005498 polishing Methods 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 claims description 42
- 238000003763 carbonization Methods 0.000 claims description 38
- 238000011049 filling Methods 0.000 claims description 26
- 239000002002 slurry Substances 0.000 claims description 19
- 239000003245 coal Substances 0.000 claims description 18
- 230000001174 ascending effect Effects 0.000 claims description 15
- 239000011468 face brick Substances 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000010426 asphalt Substances 0.000 claims description 9
- 210000003608 fece Anatomy 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 230000002441 reversible effect Effects 0.000 claims description 8
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 238000003892 spreading Methods 0.000 claims description 6
- 230000007480 spreading Effects 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 238000005259 measurement Methods 0.000 claims description 4
- 206010061274 Malocclusion Diseases 0.000 claims description 3
- 239000004927 clay Substances 0.000 claims description 3
- 230000002354 daily effect Effects 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 230000009191 jumping Effects 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 3
- 229920006327 polystyrene foam Polymers 0.000 claims description 3
- 230000001172 regenerating effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 238000003079 width control Methods 0.000 claims description 3
- 238000010009 beating Methods 0.000 claims description 2
- 238000004904 shortening Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 8
- 239000007789 gas Substances 0.000 description 8
- 238000004939 coking Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B29/00—Other details of coke ovens
- C10B29/02—Brickwork, e.g. casings, linings, walls
Abstract
The invention discloses a building and building process of a large coke oven, which comprises the following steps: s1, measuring and paying off the coke oven; s2, building a coke oven foundation top plate: s21, performing secondary leveling on the coke oven foundation top plate concrete, building a top plate and paving bricks after the secondary leveling is checked to be qualified, and measuring the top elevation of the foundation top plate to be discharged when the furnace body is built; s22, during building, placing the red brick boundary line of the top plate of the foundation on the concrete foundations at the furnace ends at two sides, building by drawing a line according to the central elevation, and placing the brick layer line of the masonry on a gas pipe along with building and checking the geometric dimension elevation and the flatness of the masonry; s23, symmetrically building walls at two ends of the coke oven, leveling gaps at the air gas pipeline by using mortar, checking the elevation and the flatness of the top surface after red bricks and heat insulation bricks are laid on the top plate of the foundation, polishing, paving a furnace bottom sliding layer after the red bricks and the heat insulation bricks are qualified, and completely paving the whole oven once according to the designed position before laying the bricks. The invention has the advantages of reducing construction cost and shortening construction period.
Description
Technical Field
The invention relates to the field of coke oven construction. More particularly, the invention relates to a building and a building process of a large coke oven.
Background
The coke is an important raw material and fuel in the industries of metallurgy, machinery, chemical industry and the like, wherein the amount of the coke consumed by blast furnace iron making in the metallurgical industry is the largest. Although the development of technologies such as oxygen-enriched coal powder injection in blast furnaces and direct reduction iron making reduces the demand of coke in metallurgical industry, a general idea is that the iron making process without coke does not widely replace the current blast furnace iron making method at least within 20 years to 30 years in the future, and the coke is still the main raw material for the future steel production.
The world coking industry has developed significantly over the last several decades. Earlier developed advanced process technologies such as a large-volume coke oven, a stamp-charging coke oven and a dry quenching coke are improved in industrialized actual production operation; the new technology developed in the last 30 years, such as the Japanese formed coke process, the German giant coking reactor, the American non-recovery coke oven, the Soviet Union vertical continuous layered coking process, and the like, accelerates the industrialization process. The coking industry in China develops rapidly in more than 20 years: the Chinese coke oven technology represented by Bao steel second-stage engineering 6m coke oven reaches the international level; tamping coke technology and device, dry quenching coke technology and blending coal coking technology are accelerating to be popularized; foundry coke and hot press coke forming plants have been constructed. It can be said that the gap from the international advanced level is gradually shrinking.
The coke oven is a continuous production thermal equipment with long service life, large volume and high manufacturing cost, is a furnace with the most complex function in various furnaces and kilns, has very strict quality requirements of coke oven engineering, high requirements on operation technical level, complex measures and certain difficulty in controlling the engineering quality. The existing coke oven masonry process has the problems of large construction waste, low material recovery rate, large equipment investment, increased construction cost, prolonged construction period and the like.
Disclosure of Invention
The invention aims to provide a building and laying process of a large coke oven, which reduces the construction cost and shortens the construction period.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a large coke oven furnace building and masonry process comprising the steps of:
s1, measuring and paying off the coke oven;
s2, building a coke oven foundation top plate:
s21, performing secondary leveling on the coke oven foundation top plate concrete, building a top plate and paving bricks after the secondary leveling is checked to be qualified, and measuring the top elevation of the foundation top plate to be discharged when the furnace body is built;
s22, during building, placing the red brick boundary line of the top plate of the foundation on the concrete foundations at the furnace ends at two sides, building by drawing a line according to the central elevation, and placing the brick layer line of the masonry on a gas pipe along with building and checking the geometric dimension elevation and the flatness of the masonry;
s23, symmetrically building walls at two ends of the coke oven, leveling gaps at the air gas pipeline by using mortar, checking the elevation and the flatness of the top surface after red bricks and heat insulation bricks are laid on the top plate of the foundation, polishing, paving a furnace bottom sliding layer after the red bricks and the heat insulation bricks are laid, and finishing the whole-oven one-time paving according to the designed position before laying the bricks when the sliding layer is laid;
s3, as shown in figure 2, horizontal flue building:
s31, masonry direction: each layer is built from the coke side to the machine side, and lining bricks and tubular bricks are built from the furnace to the two sides;
s32, the pipe brick is built by an insert building method, the height of a pipe brick layer is controlled, stay wires are built, the mortar plumpness and the expansion joint width are noticed, and the flatness of the pipe brick is ensured by checking with a guiding rule to be horizontal to the adjacent building body; when the tubular bricks are built, rubber pullers are inserted into the tubular bricks, so that mortar falling into the tubular bricks can be cleaned conveniently, after the tubular bricks are built, a steel pipe mould is used for correcting the interior of the tubular bricks to be staggered, and a measuring ruler or a sample plate is used for checking whether the spacing between the tubular bricks is correct; a cover plate with a wooden plug is covered to prevent sundries from falling into the gas pipeline;
s33, when the lining bricks are built, supporting by using battens;
s34, reserving an expansion gap: placing a polystyrene foam board with the thickness of 9mm into an expansion joint of 10mm between the lining brick and the operator brick and between the single wall and the horizontal flue partition wall during building;
s35, spreading oiled paper protection with the same width as the horizontal flue at the bottom of the horizontal flue, protecting the surface of each expansion joint by the oiled paper, spreading a layer of asphalt felt on the top of the sub-brick, and then putting a layer of springboard on the top of the sub-brick for protection;
s4, constructing the regenerator;
the main wall of the regenerator and the silica brick part of the single wall use low-temperature silica refractory slurry, and the clay lining brick and the grate brick use clay slurry; building 10-34 layers of central partition walls of the regenerative chamber, a main wall and a single wall simultaneously;
s5, building a chute;
s6, building a carbonization chamber and a combustion chamber as shown in figure 3;
s61, sequentially building wall tiles of the carbonization chamber, partition wall tiles and bottom laying bricks of the combustion chamber; when building the brick of the wall of the carbonization chamber, besides the upper surface drawing line, the brick is also built according to a wall width control line marked on the bottom surface of the carbonization chamber so as to ensure the accuracy of the lower corner position of the wall surface, and the flatness of the wall surface of the carbonization chamber is checked by using a 2m guiding rule rod;
s62, using the 10 th layer and the 11 th layer of the combustion chamber as lower circulating air passages, checking the wall surface flatness of the carbonization chamber by using a 2m guiding rule rod in the building process, building the tubular bricks simultaneously, and completely cleaning a chute and a gas passage after the building is finished; laying a wooden protection plate at the bottom of the carbonization chamber;
s63, the partition wall of the vertical flue on the 12 th layer of the combustion chamber is used as the overhead of the lower circulating flue, the squeezed slurry is timely recycled when bricks are built, the lower brick joints are strictly hooked tightly, and meanwhile, the flatness of the wall surface and the height difference of the adjacent walls are guaranteed; scattering sawdust with the thickness of 15mm at the bottom of a partition wall of the vertical flue, and then covering a fixed protection plate and a movable protection plate at the bottom of the vertical flue;
s64, after brick laying, joint pointing and cleaning of the 13 th layer wall of the combustion chamber are finished, mounting movable protection plates on brick joints between thirteen layers and twelve layers, fixing elastic screws, lifting the movable protection plates once every 5 layers of bricks are laid, and filling marks left after the elastic screws are removed with half-dry slurry before lifting;
s65, the 14 th to 47 th layers of the combustion chamber are single and even circulation layers of the combustion chamber wall, reverse slab staggering is not generated on the corresponding wall surface of the carbonization chamber during building, individual non-reverse slab staggering is not more than 1, and the flatness and the verticality of the wall surface must be strictly controlled when the furnace wall at the jumping position is built;
s66, the wall tiles on 48 layers of the combustion chamber become wider, the wall tiles are prevented from inclining into the combustion chamber during building, the movable protection plate is taken out after the building is finished and the wall tiles are cleaned;
s67, enabling the 50 th layer of the combustion chamber to be over-jacked, checking whether transverse cracks exist by capping bricks one by one when the over-jacked carbonization chamber is built, enabling the wall surface of the carbonization chamber to be composed of two layers of bricks, pulling wires for three times during building, beating joint ash, checking whether the upper surfaces of the bricks are flat or not by using a guiding ruler while building, checking the plump condition of brick joints below the fire holes by using a sight glass when one fire hole brick is built, tightly hooking by using semi-dry slurry in an uncompacted place, and putting a sponge support in the fire holes for protection;
when the 50 th to 57 th layers of the combustion chamber are built, rubber plugs are placed in the lower layer fire observation holes to recover slurry, the sponge support is lifted up once every time a layer of bricks is built, and a dust collector is used for completely sucking the slurry on the sponge support before lifting;
s7, as shown in figure 4, building the furnace roof;
s71, constructing a 58 th layer by using the top bricks of the furnace roof;
firstly, drawing wires to build the fire-seeing eye bricks according to the matching lines, and then inserting and building other bricks among the eye bricks; when the eye brick is laid, a rubber puller is placed in the eye brick; when the lining brick is built, firstly, 5mm of horse dung paper is placed on two sides of the top brick, and then the lining brick is built;
s72, building lining bricks of the 1 st to 6 th layers;
before building, placing rubber drawers in the next layer of observation holes for receiving mortar, timely recovering mortar extruded during brick building, and lifting the sponge holders in the next layer of observation holes up by one layer after pointing is finished; when the lining bricks are built, one piece of horse dung paper with one side being ashed is placed between every two observation holes; because the side surface of the lining brick is an expansion joint, a wire is pulled along the furnace width direction during building, and the straightness and the malocclusion condition are checked by a guiding rule;
s73, building a coal feeding hole and an ascending pipe;
before building, firstly, lining bricks of the fire observation hole are scribed on brick layers of the coal feeding hole and the ascending pipe, the elevation and the geometric dimension of the brick layers are controlled according to the brick layer lines during building, and the flatness of each layer is checked by using a guiding ruler;
the bricks of the coal feeding hole and the ascending pipe are all inserted bricks, and during building, an expansion joint protection rope is plugged in an expansion joint of the next layer for each layer of coal feeding hole and ascending pipe, and then an expansion joint plate is placed for building;
s74, building core filling bricks;
before building the core-filling bricks, firstly, marking brick layer lines of the core-filling bricks on the side surfaces of the lining bricks of the observation holes so as to control the elevation of each layer of the core-filling bricks. When the filling brick is built, 5mm of horse dung paper is placed in the expansion joint between the two sides of the filling brick and the lining brick of the observation hole, and the filling brick is built while being placed. During building, construction is carried out strictly according to drawings, and the positions of processed bricks cannot be changed randomly;
s75, building the paving bricks;
sequentially laying face bricks on the fire observation holes, laying face bricks on the coal adding port, the ascending pipe and the filling brick; when the fire observation hole paving face bricks are built, firstly building a datum brick at the longitudinal center position of the coke oven as a height datum, then building by pulling a wire, wherein the building is required to be smooth, staggered teeth cannot be generated between the fire observation hole paving brick holes and the lower layer fire observation holes, and after the fire observation hole paving face bricks are built, the fire observation hole iron pieces can be built in the fire observation holes by pouring concrete; when the face bricks are laid, the sleepers are put in at the same time.
Preferably, the coke oven measurement pay-off in the first step specifically includes: the central line and the elevation line of the coke oven are led to a furnace body anti-wall and a foundation top plate by taking a permanent mark pile and a datum point outside a greenhouse as references, a certain number of staples are buried, and the central line carved on the staples is used for pulling the central line of a longitudinal axis and the two parallel side elevation lines during brick laying;
after upright wire rods at the resisting walls at the two sides of the coke oven are installed in place and are checked and confirmed to be firm, elevation control lines, coke oven combustion chamber central lines and brick layer lines of all parts are released on the wire rods; the paying-off height is controlled to be 1200 +/-100 mm each time, and the center line is measured by a steel tape at one time; in daily construction, the central line of the line rod is checked every day, and masonry is started after no deviation is confirmed; checking the boundary lines of the target plate and the central lines of the two combustion chambers and the brickwork at each part, and checking a secondary stay wire control line, and building after confirming the central line and the brick layer line which are aligned with the vertical line rod.
Preferably, when the first layer of masonry is performed in step S32, the alignment lines and the tube brick layer spacing and position are checked by the alignment lines at any time during the masonry.
Preferably, the step S5 specifically includes:
s51, constructing a first layer of the inclined chute, constructing a main wall and a single wall in sequence, ensuring the accuracy of the position and the size of the opening of the inclined chute, and controlling the width of the opening of the inclined chute by using a template;
s52, laying a chute layer 2, laying a main wall and a single wall in sequence, checking the height difference between the top surfaces of the single wall and the adjacent main wall, wherein the height difference is smaller than m, ensuring the flatness of the top surface and preventing bricks on two sides of the wall from inclining downwards; the upper and lower staggered platforms of the ramp port are not more than m, and if the requirement cannot be met, the problem can be solved by adjusting brick joints or replacing bricks;
s53, constructing a 3 rd layer of inclined channel, and constructing a main wall, a single wall and an overhead brick in sequence; before the top brick is laid, a sliding paper edge is laid between the 2 nd layer main wall on the inclined edge of the top brick, the top brick is laid while being paved, an expansion plate is placed at an expansion joint on two sides during laying the brick, after the layer of brick is laid, ash in the expansion joint is removed by using a hook and compressed air, sawdust is filled in the expansion joint, and asphalt with the thickness of 20-20 mm falls from the top surface to seal the opening;
s54, constructing 4 th to 7 th layers of inclined chutes, and constructing a single wall by first stay wires, a single wall by second stay wires and a main wall in sequence; the first stay wire position of the single wall is positioned between two rows of bricks in the middle of the single wall, and the second stay wire position of the single wall is positioned between main walls at two sides; when in building, firstly, a single-wall middle brick is arranged for building a single-wall primary bracing wire position, then a single-wall side brick is arranged for building a single-wall secondary bracing wire; when the single wall is built, the width of the single wall is built to negative tolerance so as to ensure the expansion reserved width; when building a main wall, placing an expansion joint plate at an expansion position between the main wall and the single wall;
s55, laying the chute on the 8 th layer, and laying bottom bricks on the main wall and the carbonization chamber in sequence; when building bottom bricks of the carbonization chamber, firstly, paving sliding oilpaper on the top surfaces of 7 th-layer expansion joints, then placing expansion joint plates at the expansion joints on the two sides of the masonry, paving the sliding oilpaper while building, moving an expansion joint sample plate, and simultaneously using a 2m guiding rule rod to check whether the flatness of the bottom bricks and the height between the bottom bricks and a main wall are consistent;
preferably, in the step S55, the bottom-laying bricks do not have reverse staggered platforms, sawdust is filled in the expansion joints, and asphalt with the thickness of 20-20 mm falls from the top surface to seal the expansion joints;
preferably, in S7, before the tiling, the brick surface is inspected for cracks, and the tiling is not allowed to have transverse cracks;
when the over-roof brick is laid, sliding oilpaper is laid below the over-roof brick while the over-roof brick is laid, and the upper surface of the over-roof brick is narrower than the lower surface of the over-roof brick.
The invention at least comprises the following beneficial effects: the new technology for building and laying the large-scale coke oven does not use a vertical standard rod to control elevation, reduces the waste of materials, improves the recovery rate of the materials, shortens the construction period and fills a blank for the construction of the large-scale coke oven.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a control diagram of the coke oven measurement payoff of the present invention;
FIG. 2 is a horizontal flue structure and construction flow diagram of the present invention;
FIG. 3 is a schematic view of the construction of the carbonization chamber and the combustion chamber of the present invention;
fig. 4 is a view of the construction of the stove top of the present invention.
Description of reference numerals: 100 resistant walls, 200 combustion chambers, 300 carbonization chambers, 400 elastic bolts, 500 movable protective plates, 600 observation holes, 700 coal feeding holes, 800 expansion joints and 900 overhead bricks.
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that: the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
The invention is further described in detail with reference to the accompanying drawings and implementation, and the specific implementation process is as follows:
as shown in figure 1, the invention provides a building and laying process of a large coke oven, which comprises the following steps:
s1, measuring and paying off the coke oven;
s2, building a coke oven foundation top plate:
s21, performing secondary leveling on the top plate concrete of the coke oven foundation, and building top plate bricks after the top plate concrete is checked to be qualified, wherein during the construction of the top plate, the building elevation directly influences the upper building body, during the building, the elevation of the top plate of the foundation is measured and emitted by the position of the transverse center line of the oven body, and the foundation is adjusted upwards or downwards within the allowable deviation of the top plate according to the refractory condition of the horizontal flue, so that the normal building of the upper building body is facilitated, and the brick grinding amount possibly generated by the horizontal flue is reduced;
s22, during building, placing the red brick boundary line of the top plate of the foundation on the concrete foundations at the furnace ends at two sides, building by drawing a line according to the central elevation, and placing the brick layer line of the masonry on a gas pipe along with building and checking the geometric dimension elevation and the flatness of the masonry;
s23, symmetrically building walls at two ends of the coke oven, leveling gaps at the air gas pipeline by using mortar, checking the elevation and the flatness of the top surface after red bricks and heat insulation bricks are laid on the top plate of the foundation, polishing, paving a furnace bottom sliding layer after the red bricks and the heat insulation bricks are laid, and finishing the whole-oven one-time paving according to the designed position before laying the bricks when the sliding layer is laid;
s3, horizontal flue building:
s31, masonry direction: each layer is built from the coke side to the machine side, and lining bricks and tubular bricks are built from the furnace to the two sides;
s32, the pipe brick is built by an insert building method, the height of a pipe brick layer is controlled, stay wires are built, the mortar plumpness and the expansion joint width are noticed, and the flatness of the pipe brick is ensured by checking with a guiding rule to be horizontal to the adjacent building body; when the tubular bricks are built, rubber pullers are inserted into the tubular bricks, so that mortar falling into the tubular bricks can be cleaned conveniently, after the tubular bricks are built, a steel pipe mould is used for correcting the interior of the tubular bricks to be staggered, and a measuring ruler or a sample plate is used for checking whether the spacing between the tubular bricks is correct; a cover plate with a wooden plug is covered to prevent sundries from falling into the gas pipeline;
s33, when the lining bricks are built, supporting by using battens;
s34, reserving an expansion gap: placing a polystyrene foam board with the thickness of 9mm into an expansion joint of 10mm between the lining brick and the operator brick and between the single wall and the horizontal flue partition wall during building;
s35, spreading oiled paper protection with the same width as the horizontal flue at the bottom of the horizontal flue, protecting the surface of each expansion joint by the oiled paper, spreading a layer of asphalt felt on the top of the sub-brick, and then putting a layer of springboard on the top of the sub-brick for protection;
s4, constructing the regenerator;
the main wall of the regenerator and the silica brick part of the single wall use low-temperature silica refractory slurry, and the clay lining brick and the grate brick use clay slurry; building 10-34 layers of central partition walls of the regenerative chamber, a main wall and a single wall simultaneously;
s5, building a chute;
s6, building a carbonization chamber and a combustion chamber;
s61, sequentially building wall tiles of the carbonization chamber, partition wall tiles and bottom laying bricks of the combustion chamber; when building the brick of the wall of the carbonization chamber, besides the upper surface drawing line, the brick is also built according to a wall width control line marked on the bottom surface of the carbonization chamber so as to ensure the accuracy of the lower corner position of the wall surface, and the flatness of the wall surface of the carbonization chamber is checked by using a 2m guiding rule rod;
s62, using the 10 th layer and the 11 th layer of the combustion chamber as lower circulating air passages, checking the wall surface flatness of the carbonization chamber by using a 2m guiding rule rod in the building process, building the tubular bricks simultaneously, and completely cleaning a chute and a gas passage after the building is finished; laying a wooden protection plate at the bottom of the carbonization chamber;
s63, the partition wall of the vertical flue on the 12 th layer of the combustion chamber is used as the overhead of the lower circulating flue, the squeezed slurry is timely recycled when bricks are built, the lower brick joints are strictly hooked tightly, and meanwhile, the flatness of the wall surface and the height difference of the adjacent walls are guaranteed; scattering sawdust with the thickness of 15mm at the bottom of a partition wall of the vertical flue, and then covering a fixed protection plate and a movable protection plate at the bottom of the vertical flue;
s64, after brick laying, joint pointing and cleaning of the 13 th layer wall of the combustion chamber are finished, a movable protective plate is installed on the brick joints between the thirteen layers and the twelve layers, a tightening screw is fixed without being screwed too tightly so as to avoid cracking of the brick joints, the movable protective plate is lifted once every 5 layers of bricks are laid, and before lifting, traces left after the tightening screw is detached are filled with half-dry slurry;
s65, the 14 th to 47 th layers of the combustion chamber are single and even circulation layers of the combustion chamber wall, reverse slab staggering is not generated on the corresponding wall surface of the carbonization chamber during building, individual non-reverse slab staggering is not more than 1, and the flatness and the verticality of the wall surface must be strictly controlled when the furnace wall at the jumping position is built;
s66, the wall tiles on 48 layers of the combustion chamber become wider, the wall tiles are prevented from inclining into the combustion chamber during building, the movable protection plate is taken out after the building is finished and the wall tiles are cleaned;
s67, enabling the 50 th layer of the combustion chamber to be over-jacked, checking whether transverse cracks exist by capping bricks one by one when the over-jacked carbonization chamber is built, enabling the wall surface of the carbonization chamber to be composed of two layers of bricks, pulling lines for three times when the wall surface is built, and checking whether the joints are gray as the over-jacked bricks are inserted into the bricks for building, paying attention to slurry fullness during construction, checking whether the upper surfaces of the bricks are flat by using a guiding rule while building, checking the fullness of brick joints below a fire hole by using a sight glass when one fire hole brick is built, tightly hooking by using semi-dry slurry at an incompact place, and putting a sponge support into the fire hole for protection;
when the 50 th to 57 th layers of the combustion chamber are built, rubber plugs are placed in the lower layer fire observation holes to recover slurry, the sponge support is lifted up once every time a layer of bricks is built, and a dust collector is used for completely sucking the slurry on the sponge support before lifting;
s7, building a furnace roof;
s71, constructing a 58 th layer by using the top bricks of the furnace roof;
firstly, drawing wires to build the fire-seeing eye bricks according to the matching lines, and then inserting and building other bricks among the eye bricks; when the eye brick is laid, a rubber puller is placed in the eye brick to prevent mortar from falling into a combustion chamber; when the lining brick is built, firstly, 5mm of horse dung paper is placed on two sides of the top brick, and then the lining brick is built;
s72, building lining bricks of the 1 st to 6 th layers;
before building, placing rubber drawers in the next layer of observation holes for receiving mortar, timely recovering mortar extruded during brick building, and lifting the sponge holders in the next layer of observation holes up by one layer after pointing is finished; when the lining bricks are built, one piece of horse dung paper with one side being ashed is placed between every two observation holes; because the side surface of the lining brick is an expansion joint, a wire is pulled along the furnace width direction during building, and the straightness and the malocclusion condition are checked by a guiding rule;
s73, building a coal feeding hole and an ascending pipe;
before building, firstly, lining bricks of the fire observation hole are scribed on brick layers of the coal feeding hole and the ascending pipe, the elevation and the geometric dimension of the brick layers are controlled according to the brick layer lines during building, and the flatness of each layer is checked by using a guiding ruler;
the bricks of the coal feeding hole and the ascending pipe are all inserted bricks, mud at opposite seams is required to be full during building, a expansion seam protection rope is plugged in an expansion seam of the next layer when the coal feeding hole and the ascending pipe are built at each layer, and then an upper expansion seam plate is placed for building;
s74, building core filling bricks;
before building the core-filling bricks, firstly, marking brick layer lines of the core-filling bricks on the side surfaces of the lining bricks of the observation holes so as to control the elevation of each layer of the core-filling bricks. When the filling brick is built, 5mm of horse dung paper is placed in the expansion joint between the two sides of the filling brick and the lining brick of the observation hole, and the filling brick is built while being placed. During building, construction is carried out strictly according to drawings, and the positions of processed bricks cannot be changed randomly;
s75, building the paving bricks;
sequentially laying face bricks on the fire observation holes, laying face bricks on the coal adding port, the ascending pipe and the filling brick; when the fire observation hole paving face bricks are built, firstly building a datum brick at the longitudinal center position of the coke oven as a height datum, then building by pulling a wire, wherein the building is required to be smooth, staggered teeth cannot be generated between the fire observation hole paving brick holes and the lower layer fire observation holes, and after the fire observation hole paving face bricks are built, the fire observation hole iron pieces can be built in the fire observation holes by pouring concrete; when the face bricks are laid, the sleepers are put in at the same time.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: as shown in FIG. 1, the coke oven measurement pay-off in the first step specifically comprises: the central line and the elevation line of the coke oven are led to a furnace body anti-wall and a foundation top plate by taking a permanent mark pile and a datum point outside a greenhouse as references, a certain number of staples are buried, and the central line carved on the staples is used for pulling the central line of a longitudinal axis and the two parallel side elevation lines during brick laying;
after upright wire rods at the resisting walls at the two sides of the coke oven are installed in place and are checked and confirmed to be firm, elevation control lines, coke oven combustion chamber central lines and brick layer lines of all parts are released on the wire rods; the paying-off height is controlled to be 1200 +/-100 mm every time, the center line is measured by a 50m steel tape at one time, and the tension of the steel tape is controlled to be 100N so as to reduce the transmission error; in daily construction, the central line of the line rod is checked every day, and masonry is started after no deviation is confirmed; checking the boundary lines of the target plate and the central lines of the two combustion chambers and the brickwork of each part and secondary stay wire control lines, and building after confirming the central lines and the brick layer lines of the upright line poles, thereby ensuring the geometric dimension and the internal quantity of the construction part.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: in the first layer masonry in step S32, since the first layer and the alignment line are easily moved on the sliding layer, the alignment line and the tube brick layer are checked for the distance and the position by the alignment line rod at any time during the masonry.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: in step S5, the method specifically includes:
s51, constructing a first layer of the inclined chute, constructing a main wall and a single wall in sequence, ensuring the accuracy of the position and the size of the opening of the inclined chute, and controlling the width of the opening of the inclined chute by using a template;
s52, laying a chute layer 2, laying a main wall and a single wall in sequence, checking the height difference between the top surfaces of the single wall and the adjacent main wall, wherein the height difference is smaller than m, ensuring the flatness of the top surface and preventing bricks on two sides of the wall from inclining downwards; the upper and lower staggered platforms of the ramp port are not more than m, and if the requirement cannot be met, the problem can be solved by adjusting brick joints or replacing bricks;
s53, constructing a 3 rd layer of inclined channel, and constructing a main wall, a single wall and an overhead brick in sequence; before the top brick is laid, a sliding paper edge is required to be put down between the 2 nd layer of main wall on the inclined edge of the top brick for paving and laying, an expansion plate is required to be placed at the expansion joint on the two sides when the brick is laid so as to ensure the width of the expansion joint, after the layer of brick is laid, ash residues in the expansion joint are removed by using a hook and compressed air, saw dust is filled in the expansion joint after the inspection and approval, and asphalt with the thickness of 20-20 mm falls into the top surface for sealing;
s54, constructing 4 th to 7 th layers of inclined chutes, and constructing a single wall by first stay wires, a single wall by second stay wires and a main wall in sequence; the first stay wire position of the single wall is positioned between two rows of bricks in the middle of the single wall, and the second stay wire position of the single wall is positioned between main walls at two sides; when in building, firstly, a single-wall middle brick is arranged for building a single-wall primary bracing wire position, then a single-wall side brick is arranged for building a single-wall secondary bracing wire; when the single wall is built, the width of the single wall is built to negative tolerance so as to ensure the expansion reserved width; when building a main wall, placing an expansion joint plate at an expansion position between the main wall and the single wall;
s55, laying the chute on the 8 th layer, and laying bottom bricks on the main wall and the carbonization chamber in sequence; when building bottom bricks of the carbonization chamber, firstly, paving sliding oilpaper on the top surfaces of 7 th-layer expansion joints, then placing expansion joint plates at the expansion joints on the two sides of the masonry, paving the sliding oilpaper while building, moving an expansion joint sample plate, and simultaneously using a 2m guiding rule rod to check whether the flatness of the bottom bricks and the height between the bottom bricks and a main wall are consistent;
the technical scheme can also comprise the following technical details so as to better realize the technical effects: in the step S55, the bottom-laying bricks cannot be reversely staggered, sawdust is filled in the expansion joints, and asphalt with the thickness of 20-20 mm falls into the expansion joints from the top surface for sealing;
the eighth layer of the chute is a special inspection layer, the chute is cleaned completely after being built, and after the chute is inspected completely without errors according to standards, the expansion joint is protected by a sticker.
The technical scheme can also comprise the following technical details so as to better realize the technical effects: in the step S7, before the roof brick is laid, whether cracks exist on the surface of the brick needs to be checked, and transverse cracks are not allowed to exist in the roof brick;
when the over-roof brick is laid, sliding oilpaper is laid below the over-roof brick while the over-roof brick is laid, and the upper surface of the over-roof brick is narrower than the lower surface of the over-roof brick.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (6)
1. A large-scale coke oven building and building process is characterized by comprising the following steps:
s1, measuring and paying off the coke oven;
s2, building a coke oven foundation top plate:
s21, performing secondary leveling on the coke oven foundation top plate concrete, building a top plate and paving bricks after the secondary leveling is checked to be qualified, and measuring the top elevation of the foundation top plate to be discharged when the furnace body is built;
s22, during building, placing the red brick boundary line of the top plate of the foundation on the concrete foundations at the furnace ends at two sides, building by drawing a line according to the central elevation, and placing the brick layer line of the masonry on a gas pipe along with building and checking the geometric dimension elevation and the flatness of the masonry;
s23, symmetrically building walls at two ends of the coke oven, leveling gaps at the air gas pipeline by using mortar, checking the elevation and the flatness of the top surface after red bricks and heat insulation bricks are laid on the top plate of the foundation, polishing, paving a furnace bottom sliding layer after the red bricks and the heat insulation bricks are laid, and finishing the whole-oven one-time paving according to the designed position before laying the bricks when the sliding layer is laid;
s3, horizontal flue building:
s31, masonry direction: each layer is built from the coke side to the machine side, and lining bricks and tubular bricks are built from the furnace to the two sides;
s32, the pipe brick is built by an insert building method, the height of a pipe brick layer is controlled, stay wires are built, the mortar plumpness and the expansion joint width are noticed, and the flatness of the pipe brick is ensured by checking with a guiding rule to be horizontal to the adjacent building body; when the tubular bricks are built, rubber pullers are inserted into the tubular bricks, so that mortar falling into the tubular bricks can be cleaned conveniently, after the tubular bricks are built, a steel pipe mould is used for correcting the interior of the tubular bricks to be staggered, and a measuring ruler or a sample plate is used for checking whether the spacing between the tubular bricks is correct; a cover plate with a wooden plug is covered to prevent sundries from falling into the gas pipeline;
s33, when the lining bricks are built, supporting by using battens;
s34, reserving an expansion gap: placing a polystyrene foam board with the thickness of 9mm into an expansion joint of 10mm between the lining brick and the operator brick and between the single wall and the horizontal flue partition wall during building;
s35, spreading oiled paper protection with the same width as the horizontal flue at the bottom of the horizontal flue, protecting the surface of each expansion joint by the oiled paper, spreading a layer of asphalt felt on the top of the sub-brick, and then putting a layer of springboard on the top of the sub-brick for protection;
s4, constructing the regenerator;
the main wall of the regenerator and the silica brick part of the single wall use low-temperature silica refractory slurry, and the clay lining brick and the grate brick use clay slurry; building 10-34 layers of central partition walls of the regenerative chamber, a main wall and a single wall simultaneously;
s5, building a chute;
s6, building a carbonization chamber and a combustion chamber;
s61, sequentially building wall tiles of the carbonization chamber, partition wall tiles and bottom laying bricks of the combustion chamber; when building the brick of the wall of the carbonization chamber, besides the upper surface drawing line, the brick is also built according to a wall width control line marked on the bottom surface of the carbonization chamber so as to ensure the accuracy of the lower corner position of the wall surface, and the flatness of the wall surface of the carbonization chamber is checked by using a 2m guiding rule rod;
s62, using the 10 th layer and the 11 th layer of the combustion chamber as lower circulating air passages, checking the wall surface flatness of the carbonization chamber by using a 2m guiding rule rod in the building process, building the tubular bricks simultaneously, and completely cleaning a chute and a gas passage after the building is finished; laying a wooden protection plate at the bottom of the carbonization chamber;
s63, the partition wall of the vertical flue on the 12 th layer of the combustion chamber is used as the overhead of the lower circulating flue, the squeezed slurry is timely recycled when bricks are built, the lower brick joints are strictly hooked tightly, and meanwhile, the flatness of the wall surface and the height difference of the adjacent walls are guaranteed; scattering sawdust with the thickness of 15mm at the bottom of a partition wall of the vertical flue, and then covering a fixed protection plate and a movable protection plate at the bottom of the vertical flue;
s64, after brick laying, joint pointing and cleaning of the 13 th layer wall of the combustion chamber are finished, mounting movable protection plates on brick joints between thirteen layers and twelve layers, fixing elastic screws, lifting the movable protection plates once every 5 layers of bricks are laid, and filling marks left after the elastic screws are removed with half-dry slurry before lifting;
s65, the 14 th to 47 th layers of the combustion chamber are single and even circulation layers of the combustion chamber wall, reverse slab staggering is not generated on the corresponding wall surface of the carbonization chamber during building, individual non-reverse slab staggering is not more than 1, and the flatness and the verticality of the wall surface must be strictly controlled when the furnace wall at the jumping position is built;
s66, the wall tiles on 48 layers of the combustion chamber become wider, the wall tiles are prevented from inclining into the combustion chamber during building, the movable protection plate is taken out after the building is finished and the wall tiles are cleaned;
s67, enabling the 50 th layer of the combustion chamber to be over-jacked, checking whether transverse cracks exist by capping bricks one by one when the over-jacked carbonization chamber is built, enabling the wall surface of the carbonization chamber to be composed of two layers of bricks, pulling wires for three times during building, beating joint ash, checking whether the upper surfaces of the bricks are flat or not by using a guiding ruler while building, checking the plump condition of brick joints below the fire holes by using a sight glass when one fire hole brick is built, tightly hooking by using semi-dry slurry in an uncompacted place, and putting a sponge support in the fire holes for protection;
when the 50 th to 57 th layers of the combustion chamber are built, rubber plugs are placed in the lower layer fire observation holes to recover slurry, the sponge support is lifted up once every time a layer of bricks is built, and a dust collector is used for completely sucking the slurry on the sponge support before lifting;
s7, building a furnace roof;
s71, constructing a 58 th layer by using the top bricks of the furnace roof;
firstly, drawing wires to build the fire-seeing eye bricks according to the matching lines, and then inserting and building other bricks among the eye bricks; when the eye brick is laid, a rubber puller is placed in the eye brick; when the lining brick is built, firstly, 5mm of horse dung paper is placed on two sides of the top brick, and then the lining brick is built;
s72, building lining bricks of the 1 st to 6 th layers;
before building, placing rubber drawers in the next layer of observation holes for receiving mortar, timely recovering mortar extruded during brick building, and lifting the sponge holders in the next layer of observation holes up by one layer after pointing is finished; when the lining bricks are built, one piece of horse dung paper with one side being ashed is placed between every two observation holes; because the side surface of the lining brick is an expansion joint, a wire is pulled along the furnace width direction during building, and the straightness and the malocclusion condition are checked by a guiding rule;
s73, building a coal feeding hole and an ascending pipe;
before building, firstly, lining bricks of the fire observation hole are scribed on brick layers of the coal feeding hole and the ascending pipe, the elevation and the geometric dimension of the brick layers are controlled according to the brick layer lines during building, and the flatness of each layer is checked by using a guiding ruler;
the bricks of the coal feeding hole and the ascending pipe are all inserted bricks, and during building, an expansion joint protection rope is plugged in an expansion joint of the next layer for each layer of coal feeding hole and ascending pipe, and then an expansion joint plate is placed for building;
s74, building core filling bricks;
before building the core-filling bricks, firstly, marking brick layer lines of the core-filling bricks on the side surfaces of the lining bricks of the observation holes so as to control the elevation of each layer of the core-filling bricks. When the filling brick is built, 5mm of horse dung paper is placed in the expansion joint between the two sides of the filling brick and the lining brick of the observation hole, and the filling brick is built while being placed. During building, construction is carried out strictly according to drawings, and the positions of processed bricks cannot be changed randomly;
s75, building the paving bricks;
sequentially laying face bricks on the fire observation holes, laying face bricks on the coal adding port, the ascending pipe and the filling brick; when the fire observation hole paving face bricks are built, firstly building a datum brick at the longitudinal center position of the coke oven as a height datum, then building by pulling a wire, wherein the building is required to be smooth, staggered teeth cannot be generated between the fire observation hole paving brick holes and the lower layer fire observation holes, and after the fire observation hole paving face bricks are built, the fire observation hole iron pieces can be built in the fire observation holes by pouring concrete; when the face bricks are laid, the sleepers are put in at the same time.
2. The large coke oven construction and masonry process according to claim 1, wherein the coke oven measurement line in the first step specifically comprises: the central line and the elevation line of the coke oven are led to a furnace body anti-wall and a foundation top plate by taking a permanent mark pile and a datum point outside a greenhouse as references, a certain number of staples are buried, and the central line carved on the staples is used for pulling the central line of a longitudinal axis and the two parallel side elevation lines during brick laying;
after upright wire rods at the resisting walls at the two sides of the coke oven are installed in place and are checked and confirmed to be firm, elevation control lines, coke oven combustion chamber central lines and brick layer lines of all parts are released on the wire rods; the paying-off height is controlled to be 1200 +/-100 mm each time, and the center line is measured by a steel tape at one time; in daily construction, the central line of the line rod is checked every day, and masonry is started after no deviation is confirmed; checking the boundary lines of the target plate and the central lines of the two combustion chambers and the brickwork at each part, and checking a secondary stay wire control line, and building after confirming the central line and the brick layer line which are aligned with the vertical line rod.
3. A large coke oven construction and masonry process according to claim 1 or 2, wherein during the first layer of masonry in step S32, the alignment lines and the tube brick layer spacing and position are checked by the alignment lines and the tube brick layer at any time during the masonry.
4. The building and laying process of the large coke oven according to claim 1, wherein the step S5 specifically comprises the following steps:
s51, constructing a first layer of the inclined chute, constructing a main wall and a single wall in sequence, ensuring the accuracy of the position and the size of the opening of the inclined chute, and controlling the width of the opening of the inclined chute by using a template;
s52, laying a chute layer 2, laying a main wall and a single wall in sequence, checking the height difference between the top surfaces of the single wall and the adjacent main wall, wherein the height difference is smaller than m, ensuring the flatness of the top surface and preventing bricks on two sides of the wall from inclining downwards; the upper and lower staggered platforms of the ramp port are not more than m, and if the requirement cannot be met, the problem can be solved by adjusting brick joints or replacing bricks;
s53, constructing a 3 rd layer of inclined channel, and constructing a main wall, a single wall and an overhead brick in sequence; before the top brick is laid, a sliding paper edge is laid between the 2 nd layer main wall on the inclined edge of the top brick, the top brick is laid while being paved, an expansion plate is placed at an expansion joint on two sides during laying the brick, after the layer of brick is laid, ash in the expansion joint is removed by using a hook and compressed air, sawdust is filled in the expansion joint, and asphalt with the thickness of 20-20 mm falls from the top surface to seal the opening;
s54, constructing 4 th to 7 th layers of inclined chutes, and constructing a single wall by first stay wires, a single wall by second stay wires and a main wall in sequence; the first stay wire position of the single wall is positioned between two rows of bricks in the middle of the single wall, and the second stay wire position of the single wall is positioned between main walls at two sides; when in building, firstly, a single-wall middle brick is arranged for building a single-wall primary bracing wire position, then a single-wall side brick is arranged for building a single-wall secondary bracing wire; when the single wall is built, the width of the single wall is built to negative tolerance so as to ensure the expansion reserved width; when building a main wall, placing an expansion joint plate at an expansion position between the main wall and the single wall;
s55, laying the chute on the 8 th layer, and laying bottom bricks on the main wall and the carbonization chamber in sequence; when the bottom bricks of the carbonization chamber are built, firstly, sliding oilpaper is laid on the top surfaces of the 7 th expansion joints, then expansion joint plates are placed at the expansion joints on the two sides of the masonry, the sliding oilpaper is laid while building, the expansion joint sample plate is moved, and meanwhile, a 2m guiding rule rod is used for checking the flatness of the bottom bricks and whether the heights of the bottom bricks are consistent with the height of a main wall.
5. The large coke oven construction and masonry process according to claim 1, wherein in step S55, the bottom bricks must not have reverse staggering, saw dust is filled in the expansion joint, and asphalt sealing with a thickness of 20-20 mm is dropped from the top surface.
6. The process of claim 1, wherein in step S7, before the bricks are laid, the surface of the bricks is inspected for cracks, and the bricks are laid without allowing transverse cracks;
when the over-roof brick is laid, sliding oilpaper is laid below the over-roof brick while the over-roof brick is laid, and the upper surface of the over-roof brick is narrower than the lower surface of the over-roof brick.
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Cited By (3)
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| CN114958397A (en) * | 2022-05-29 | 2022-08-30 | 五冶集团上海有限公司 | Construction method for heat recovery coke oven masonry |
| CN115353896A (en) * | 2022-08-23 | 2022-11-18 | 五冶集团上海有限公司 | Method for controlling flatness of vault of heat recovery combustion chamber |
| CN115433595A (en) * | 2022-08-04 | 2022-12-06 | 中国一冶集团有限公司 | Coke oven body masonry system |
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2021
- 2021-09-26 CN CN202111129998.1A patent/CN114181719A/en active Pending
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| 中国冶金建设公司: "焦炉砌筑施工技术核心技术调查报告", 《豆丁建筑》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114958397A (en) * | 2022-05-29 | 2022-08-30 | 五冶集团上海有限公司 | Construction method for heat recovery coke oven masonry |
| CN115433595A (en) * | 2022-08-04 | 2022-12-06 | 中国一冶集团有限公司 | Coke oven body masonry system |
| CN115353896A (en) * | 2022-08-23 | 2022-11-18 | 五冶集团上海有限公司 | Method for controlling flatness of vault of heat recovery combustion chamber |
| CN115353896B (en) * | 2022-08-23 | 2024-04-05 | 五冶集团上海有限公司 | Heat recovery combustion chamber vault flatness control method |
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