CN114195409A - Trolley with heat storage layer - Google Patents
Trolley with heat storage layer Download PDFInfo
- Publication number
- CN114195409A CN114195409A CN202111391367.7A CN202111391367A CN114195409A CN 114195409 A CN114195409 A CN 114195409A CN 202111391367 A CN202111391367 A CN 202111391367A CN 114195409 A CN114195409 A CN 114195409A
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- heat storage
- storage layer
- trolley
- grate
- refractory
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- 238000005338 heat storage Methods 0.000 title claims abstract description 72
- 239000000463 material Substances 0.000 claims abstract description 37
- 230000009970 fire resistant effect Effects 0.000 claims abstract description 20
- 239000011148 porous material Substances 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims description 25
- 238000009413 insulation Methods 0.000 claims description 14
- 239000011449 brick Substances 0.000 claims description 11
- 239000011819 refractory material Substances 0.000 claims description 8
- 238000009423 ventilation Methods 0.000 claims description 5
- 239000007769 metal material Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000009825 accumulation Methods 0.000 abstract description 12
- 238000001354 calcination Methods 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 10
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 8
- 235000011941 Tilia x europaea Nutrition 0.000 description 8
- 239000003546 flue gas Substances 0.000 description 8
- 239000004571 lime Substances 0.000 description 8
- 239000008188 pellet Substances 0.000 description 5
- 239000002918 waste heat Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
Abstract
The embodiment of the invention provides a trolley with a heat storage layer, which comprises a trolley body, a grate bar supporting beam fixedly connected to the bottom of the inner side of the trolley body and grate bars laid on the grate bar supporting beam, and is characterized in that a fire-resistant heat storage layer is fixedly arranged at the upper part of each grate bar; the fireproof heat storage layer is made of fireproof materials and is provided with air-permeable pores capable of ventilating up and down. Through this technical scheme, make fixed setting up the most heat that can absorb the calcination in-process on the fire-resistant heat accumulation layer on the grate, calcination exhaust air temperature greatly reduced behind the fire-resistant heat accumulation layer has solved the platform truck grate and has received the problem that the production line rate of leaking out that high temperature damaged and lead to easily is big, and then improves the life of platform truck by a wide margin, and the fixed setting of fire-resistant heat accumulation layer need not every duty cycle and lays again.
Description
Technical Field
The invention relates to the technical field of a belt type roasting machine, in particular to a trolley with a heat storage layer.
Background
The trolley is a main operation part of various sintering machines and travelling grate-type roasting machines, as shown in fig. 6, each rectangular square frame in the figure represents a trolley, and the main function of the trolley is to form a running rotary chain (belt type) between a head star wheel 1 and a tail star wheel 2, receive materials at an upper horizontal section, return to an initial position after preheating (drying, ignition (sintering), sintering or roasting, cooling and turning over of the travelling grate-type roasting machine, and form a transmission cycle to achieve the purpose of sintering or roasting the materials.
The trolley generally comprises a trolley body, wheels, a sealing device, a grate bar and the like. The material is supported by the vehicle body, the guard plate and the grate bar at the lower part of the vehicle body, and the parts are directly contacted with the material; the operation working condition of the trolley in the high-temperature section such as the sintering or roasting section is mainly 'blast' or 'air draft', wherein the 'blast' means that air blows materials from the upper part of the materials and discharges the trolley from the gaps of grate bars at the bottom of the materials; the 'air draft' is that the fan draws air from an air box at the lower part of the trolley, and no matter the 'air blast' or the 'air draft', the trolley body and the grate bars are in contact with the material bottom layer or the bedding material of the high-temperature section, and the material temperature directly influences the grate bars and the trolley body. For this reason, no matter the sintering machine or the grate, the trolley and the grate cannot bear the high temperature of the materials, the trolley and the grate deform after being heated to increase the air leakage rate of the production line, the operation stability of the production line is affected, and the air leakage rate of the production line is determined by the temperature of the materials, so that the service life of the production line is further affected. On the belt roasting machine, the method for improving the high-temperature resistance of the trolley and the grate bars is adopted, so that the manufacturing cost of equipment is greatly improved; the sintering machine with lower integral price has high air leakage rate during operation, which is an energy consumption problem difficult to solve all the time.
In order to solve this problem, there has been developed in the prior art an improved technique for laying a bed charge and a side charge in a sintering machine and a straight grate type roaster, in which a part of clinker is laid between the bottom of the charge and the grate bar and a part of the clinker is laid inside a bogie guard plate, thereby blocking the high temperature from the charge.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
in the above-mentioned improvement technique, adopt stone equipment to lay the bed charge in head star wheel department, after the platform truck moves the afterbody star wheel, under the action of gravity, the bed charge of laying can fall along with the material together, consequently must set up professional equipment and sieve the two to the bed charge that will sieve out is retrieved, later send back and lay again to head star wheel department, therefore the process is complicated, equipment cost is higher. Therefore, how to reduce the air leakage rate and further improve the service life of the trolley on the premise of not increasing the process complexity is a problem to be solved.
Disclosure of Invention
The embodiment of the invention provides a trolley with a heat storage layer, which is used for solving the problem of complex process in the prior art.
In order to achieve the purpose, the embodiment of the invention provides a trolley with a heat storage layer, which comprises a trolley body, a grate bar supporting beam fixedly connected to the bottom of the inner side of the trolley body and grate bars laid on the grate bar supporting beam, and is characterized in that a fire-resistant heat storage layer is fixedly arranged at the upper part of each grate bar; the fireproof heat storage layer is made of fireproof materials and is provided with air-permeable pores capable of ventilating up and down.
The technical scheme has the following beneficial effects:
in the technical scheme, the fireproof heat storage layer is fixedly arranged on the grate bar, and material spreading and screening are not required to be carried out in each working cycle, so that the process is simplified, and the equipment cost is reduced. The fireproof heat storage layer has a heat storage effect, and the waste heat of the flue gas penetrating through the material is absorbed and stored by the heat storage layer, so that the exhaust gas temperature is greatly reduced, the protection effect of the fireproof heat storage layer on the grate bars of the trolley is better than that of the conventional mode of laying the bed charge, the air leakage rate of a production line can be greatly reduced, and the service life of the trolley is further prolonged;
simultaneously, this application still has following characteristics:
1. the existing lime production technology is difficult to use a trolley process mainly because of the characteristics of high temperature, easy adhesion and the like of the lime calcination process. If adopt this application technical scheme to carry out lime production, the lime that platform truck fire-resistant heat accumulation layer upper portion was calcined also is the process that the fire-resistant heat accumulation layer in lower part heaies up, consequently lime and heat accumulation layer can not appear bonding, has guaranteed the quality of output to can improve lime and calcine efficiency.
2. The exhaust gas temperature is higher in the prior art, waste of the waste heat of the exhaust gas is caused, and the energy consumption of a production line is higher. After the technical scheme of this application is adopted, because the heat absorption effect of fire-resistant heat accumulation layer to the flue gas waste heat, the volume of discharging fume reduces, the exhaust gas temperature reduces by a wide margin to the energy consumption has been reduced.
3. For the belt type roasting machine, the metal grate bars are positioned at the lower part of the refractory heat storage layer and cannot be damaged by high temperature, so that high-temperature-resistant metal materials are not required to be selected, and the equipment cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a first embodiment of a cart with a heat storage layer according to the present invention;
FIG. 2 is a schematic structural view of a second embodiment of a cart with a heat storage layer according to the present invention;
FIG. 3 is a schematic structural view of a bogie of a third embodiment of the present invention having a heat storage layer;
FIG. 4 is a schematic structural view of an upper support beam in the second and third embodiments;
FIG. 5 is a schematic view of a side insulating panel according to an embodiment of the present invention;
FIG. 6 is a schematic view of the position of the trolley in the production line;
reference numerals: 1. a head star wheel; 2. a tail star wheel; 110. a trolley body; 120. a grate bar support beam; 130. grate bars; 140. a refractory heat storage layer; 150. an upper separator plate; 160. an upper layer support beam; 170. cushion blocks; 180 of the total weight of the composition; side heat insulation guard plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a trolley with a heat storage layer, which includes a trolley body 110, a grate supporting beam 120 fixedly connected to the bottom of the inside of the trolley body 110, and a grate 130 laid on the grate supporting beam 120, and is characterized in that a refractory heat storage layer 140 is fixedly arranged on the upper portion of the grate 130; the refractory heat storage layer 140 is made of a refractory material, and the refractory heat storage layer 140 has air-permeable pores that allow ventilation up and down.
In the paving method in the prior art, generally adopted paving materials are sintered oxidized pellets, and other forms of materials are also selected, but the materials are all spherical structures, so that gaps are ensured to exist among spheres, and hot air for roasting the materials can penetrate through the gaps. In the discharge area, the trolley is turned over, and the scattered bed material falls down together with the finished material and is separated from the trolley, so that the bed material needs to be laid again in each cycle. In order to solve the problem, the method for fixing the bed charge on the grate bar 130 is adopted instead of adopting special equipment to lay the bed charge, so that the bed charge can not fall off along with the material when the bed charge is unloaded, but is continuously fixed on the grate bar 130 and runs along with the trolley. Therefore, the paving machine does not need to be paved again every time, so that the working efficiency is greatly improved, special equipment such as a paving machine and a screening machine does not need to be configured, and the overall cost is reduced.
In order to better reduce the temperature of the grate bars 130 positioned at the bottom layer of the trolley, the common sintered oxidized pellets are not selected, but the refractory heat storage layer 140 is formed by selecting materials with good heat storage capacity, so that the refractory heat storage layer 140 absorbs a large amount of residual heat in hot air after work, the smoke discharge amount is reduced, the smoke discharge temperature is reduced, and the grate bars and the trolley are protected from being damaged.
Fig. 1 to 5 are sectional structures of the trolley of the present invention, and the improvement of the present invention over the prior art is that the material-carrying part is located at the grate bar and above, so that the partial sectional structures of the bottom layers inside the trolley are mainly shown in the figures, and other parts on the trolley are not involved.
Preferably, an upper partition 150 having an air hole is further fixedly provided above the refractory heat storage layer 140.
Because general fire-resistant heat accumulation material all has great aperture, if directly lay the material on fire-resistant heat accumulation layer 140, use long time after, the trompil on fire-resistant heat accumulation layer will be stopped up to the material in small, broken bits to make fire-resistant heat accumulation layer 140 lose ventilation function, the platform truck even whole production line will be unable normal work, consequently, it is necessary to set up upper baffle 150 in the top of fire-resistant heat accumulation layer 140. The upper layer partition plate 150 is provided with ventilation grid holes which can be round holes or long-strip holes, and the pores of the upper layer partition plate 150 are small, so that the ventilation function is kept and the upper layer partition plate is not blocked by materials.
Preferably, the porosity of the upper separator 150 is smaller than that of the grate bar 130.
Due to the above-mentioned reasons for preventing the material blockage, the pore diameter of the upper layer separator 150 is small, and the porosity thereof is required to be smaller than that of the bottom grate bar 130
Preferably, the refractory heat storage layer 140 is formed by splicing refractory bricks; the upper spacer 150 is a heat insulation plate made of a refractory material.
FIG. 1 shows a first embodiment of the invention in which the refractory heat storage layer 140 is formed by a plurality of refractory bricks which are joined together. The refractory bricks are made of refractory materials, including conventional checker bricks, honeycomb bricks, etc., which have flat upper and lower surfaces and regular edges, thus being easy to construct, and have pores (straight or irregular pores) capable of ventilating up and down. They are generally used to build regenerators of hot blast stoves, due to their excellent function of absorbing and storing heat. In this embodiment, the refractory bricks are applied to the trolley, a plurality of refractory bricks are spliced to form the refractory heat storage layer 140, and the bottom plane of each refractory brick is fixed on the grate bar 130 in an adhesive manner, so that the refractory bricks move along with the trolley on the production line. The upper partition 150 is a gas-permeable heat insulation plate made of a refractory material, and the heat insulation plate may be fixed by being bonded to the upper surface of the refractory heat storage layer 140, or may be fixed by being provided with a support beam, a bracket, or other means.
Preferably, the bogie with the heat storage layer further includes an upper support beam 160 for supporting the upper partition 150; the upper-layer supporting beam 160 is arranged above the grate supporting beam 120 in parallel and is fixedly connected with the inner side of the trolley body 110; the refractory heat storage layer 140 includes a plurality of refractory heat storage balls.
Fig. 2 shows a second embodiment of the present invention, in which refractory heat storage layer 140 is formed of refractory bricks, but refractory heat storage balls having a better heat storage capacity are used. However, similar to the oxidized pellet commonly used as the bed material in the prior art, the refractory heat storage balls are difficult to fix due to the spherical structure and cannot be bonded, so the present embodiment designs a "double-layer grate bar" structure, that is, the upper partition plate 150 itself is also set to be a fixed structure, so that the original grate bar 130 becomes the "first layer grate bar layer" below, the upper partition plate 150 becomes the "second layer grate bar layer" above, and the refractory heat storage balls are injected into the upper partition plate 150 before the upper partition plate 150 is fixedly laid, so that the refractory heat storage balls are enclosed between the grate bar 130 and the "double-layer grate bar" of the upper partition plate 150, and the refractory heat storage balls do not roll randomly any more, but form a fixed state, and do not fall off even in the process of returning after the trolley is unloaded. In order to make the upper partition 150 itself a fixed structure, it is necessary to provide a support structure at the bottom, and in this application, for the sake of simplicity, the same structure as the grate support beam 120 of the prior art is used as the upper support beam 160 for supporting the upper partition 150. The upper support beam 160 is fixedly connected to the inner side of the trolley body 110, and may be designed as an integral structure of the trolley body 110, and the structure and position of the integral structure are schematically shown in fig. 4.
Preferably, the upper partition 150 is formed by splicing upper grates made of metal material.
In this embodiment, the upper layer separator 150 may be laid using a conventional grate bar. Although the grate bars at the upper layer are made of the same metal material as the grate bars 130 and are easy to deform at high temperature, the influence can be ignored because the grate bars are only used for fixing the refractory heat storage layer 140 and preventing material slag from blocking the refractory heat storage layer 140, and the grate bars 130 at the bottom of the trolley can still be effectively protected from high temperature damage, so that the air leakage rate of a production line is reduced.
Preferably, the upper partition 150 is formed by splicing heat insulation plates made of refractory materials.
When the refractory heat storage layer 140 is composed of refractory heat storage balls, the third embodiment shown in fig. 3 may also be employed. Since the metal grate bars are also deformed at high temperature and may need to be replaced periodically, it is more preferable to combine the upper partition 150 with an insulating plate made of refractory material (as in the first embodiment). At this time, the practical life of the upper separator 150 will be greatly improved.
Further, the heat insulation board will also conduct heat to the upper layer supporting beam 160, and when the temperature of the heat insulation board is high, the upper layer supporting beam 160 is also difficult to be protected from high temperature, therefore, as shown in fig. 3, a cushion block 170 with good heat insulation capability can be disposed between the top end of the upper layer supporting beam 160 and the upper layer partition board 150, so as to avoid direct contact therebetween, and reduce the damage of high temperature to the upper layer supporting beam 160.
Preferably, the diameter of the refractory heat storage balls is larger than the diameter of the holes of the grate bars 130.
When constructing the fire-resistant heat storage layer 140 with the fire-resistant heat storage ball, the isometric fire-resistant ball can be selected for use, thereby the comprehensive heat storage capacity of the fire-resistant heat storage layer 140 can also be improved by adopting the mixture of the fire-resistant balls with different diameters, no matter how the arrangement is carried out, the diameter of the fire-resistant heat storage ball is required to be ensured to be larger than the aperture of the grate bar 130, so that the reliable fixation is realized, and the sprinkling is prevented.
In addition to replacing the original method of paving the bed material with the fixed refractory heat storage layer, in order to simplify the operation, as shown in fig. 5, a method of embedding a side heat insulation protective plate 180 on a trolley protective plate can be adopted to replace the original method of paving the edge material for the trolley in a circulating mode in the working process. After the side heat insulation protective plate 180 is fixed on the inner side of the trolley, special equipment and screening equipment for laying the rim charge in the prior art are not needed. The measure mainly adopts a heat insulation mode to protect the trolley guard plate, so that the requirement on the side heat insulation guard plate 180 is lower, and only good high temperature resistance and heat insulation capability are needed.
The trolley of the present application can be used in various sintering machines or travelling grate machines for protecting the trolley grate, for example:
in a pellet sintering machine system, materials (green pellets) are laid on an upper layer partition plate 150 of a trolley, conventional bed charge laying is not needed, roasting flue gas enters a fireproof heat storage layer 140 through the upper layer partition plate 150, the waste heat of the roasting flue gas is absorbed and stored by the fireproof heat storage layer 140, and the cooled roasting flue gas is discharged out of the trolley (enters a lower air box of the sintering machine) through a grate bar 130 at the lower part of the trolley; in another example of this application, a,
in the lime preparation system adopting the belt type roasting machine, lime raw materials are laid on the upper layer partition plate 150 of the trolley, conventional bed charge laying is not needed, roasting flue gas enters the refractory heat storage layer 140 through the upper layer partition plate 150, the waste heat of the roasting flue gas is absorbed and stored by the refractory heat storage layer 140, and the cooled roasting flue gas is discharged out of the trolley (enters the lower part air box of the belt type roasting machine) through the grate bars 130 at the lower part of the trolley.
In the foregoing detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This method of disclosure is not to be interpreted as reflecting an intention that the claimed embodiments of the subject matter require more features than are expressly recited in each claim. Rather, as the following claims reflect, invention lies in less than all features of a single disclosed embodiment. Thus, the following claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. To those skilled in the art; various modifications to these embodiments will be readily apparent, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. The trolley with the heat storage layer comprises a trolley body (110), a grate bar supporting beam (120) fixedly connected to the bottom of the inner side of the trolley body (110), and grate bars (130) laid on the grate bar supporting beam (120), and is characterized in that a fire-resistant heat storage layer (140) is fixedly arranged on the upper portion of each grate bar (130); the fireproof heat storage layer (140) is made of fireproof materials, and the fireproof heat storage layer (140) is provided with air-permeable pores capable of ventilating up and down.
2. The bogie as claimed in claim 1, wherein an upper partition (150) having ventilation holes is further fixedly provided above the refractory heat storage layer (140).
3. The trolley with the heat storage layer as claimed in claim 1, wherein the porosity of the upper separator (150) is smaller than the porosity of the grid (130).
4. The bogie with the heat storage layer according to claim 2, wherein the refractory heat storage layer (140) is formed by splicing refractory bricks; the upper layer clapboard (150) is a thermal insulation board made of refractory materials.
5. The trolley with the heat storage layer according to claim 2, further comprising an upper support beam (160) for supporting the upper partition (150); the upper-layer supporting beam (160) is arranged above the grate supporting beam (120) in parallel and is fixedly connected with the inner side of the trolley body (110); the refractory heat storage layer (140) includes a plurality of refractory heat storage balls.
6. The trolley with the heat storage layer as claimed in claim 5, wherein the upper partition (150) is a heat insulating plate made of a refractory material.
7. The trolley with the heat storage layer as claimed in claim 5, wherein the upper layer partition (150) is formed by splicing grate bars of a metal material.
8. The bogie having a heat storage layer as claimed in claim 5, wherein the refractory heat storage balls have a diameter larger than the diameter of the holes of the grate bars (130).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111391367.7A CN114195409A (en) | 2021-11-23 | 2021-11-23 | Trolley with heat storage layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111391367.7A CN114195409A (en) | 2021-11-23 | 2021-11-23 | Trolley with heat storage layer |
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| CN114195409A true CN114195409A (en) | 2022-03-18 |
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| CN202111391367.7A Pending CN114195409A (en) | 2021-11-23 | 2021-11-23 | Trolley with heat storage layer |
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| 张玉才: "解决烧结机台车间漏料的几种对策", 《烧结球团》 * |
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Application publication date: 20220318 |