CN219735379U - Primary air pipe of integrated pulverized coal burner - Google Patents
Primary air pipe of integrated pulverized coal burner Download PDFInfo
- Publication number
- CN219735379U CN219735379U CN202320715550.6U CN202320715550U CN219735379U CN 219735379 U CN219735379 U CN 219735379U CN 202320715550 U CN202320715550 U CN 202320715550U CN 219735379 U CN219735379 U CN 219735379U
- Authority
- CN
- China
- Prior art keywords
- nozzle
- primary air
- pulverized coal
- straight pipe
- air pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000003245 coal Substances 0.000 title claims abstract description 20
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 17
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 17
- 239000000919 ceramic Substances 0.000 claims abstract description 15
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 239000000571 coke Substances 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 229910001208 Crucible steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
Abstract
The utility model aims to solve the technical problem of providing an integrated pulverized coal burner primary air pipe, which consists of an outer nozzle and an inner nozzle made of silicon carbide ceramic, wherein the durability of the nozzle is improved, the primary air pipe is effectively protected from being washed, the service life of the primary air pipe is prolonged, the integrated pulverized coal burner primary air pipe comprises a square and round joint, a straight pipe section and the nozzle, and the nozzle consists of the outer nozzle sleeved inside and outside and the inner nozzle made of silicon carbide ceramic; the square and round joint is communicated with the tail end of the straight pipe section, and the front end of the nozzle is detachably connected with the head end of the straight pipe section; and silicon carbide ceramic inner liners are arranged on the inner walls of the square and round joints and the straight pipe sections.
Description
Technical Field
The utility model relates to the field of pulverized coal furnace burner equipment, in particular to a primary air pipe of an integrated pulverized coal burner.
Background
At present, a primary air pipe nozzle of a pulverized coal furnace burner mostly uses heat-resistant cast steel, cleaner fuel (blue carbon) is used according to the current energy situation, the Harbour grindability coefficient (HGI) is about 45 and lower than the grindability of most coals, the grindability index is reduced, the scouring wear index is increased, the granularity is generally between 0 and 10mm, the color is light black, the fixed carbon is more than 70%, the volatile matter is less than 8%, the ash is less than 10%, the sulfur is less than 0.3%, the moisture is less than 10%, the specific resistance is more than 3500 mu omega M, the problems of reduced grinding output of coal mill, stronger wear of a pulverizing system, the burner nozzle and the like are caused by the reduction of the Habour grindability index and the increase of the scouring wear index, the hardness of the blue carbon is obviously higher than that of the coals, and the greater the scouring wear index is, the metal wear is more serious. The licensed scour wear index can divide the abrasiveness of coal into five categories: the abrasion of Ke <1.0 is slight, ke=1.0-1.9 is not strong, ke=2.0-3.5 is strong, ke=3.6-5.0 is strong, and the semi-coke has a value of about 14 and far exceeds the value of coal.
In the overhaul process, the serious burning loss of combustion equipment such as a boiler burner nozzle and the like is found, and the primary air nozzle is caused to seriously deform a nozzle heating surface due to the long-term burning loss, high-temperature corrosion and the like, so that the edge of the nozzle is cracked and worn, and part of the nozzle is oxidized or worn and falls off; the airflow direction of the pulverized coal is changed, and the phenomena of throttling, blocking, coke hanging and the like are caused at the nozzle; the conditions of plow groove cutting, grinding through, deformation and the like are locally occurred.
Disclosure of Invention
The utility model aims to solve the technical problem of providing the primary air pipe of the integrated pulverized coal burner, which consists of an outer nozzle and an inner nozzle made of silicon carbide ceramic, so that the durability of the nozzle is improved, the primary air pipe is effectively protected from being washed, and the service life of the primary air pipe is prolonged.
The utility model is realized by the following technical scheme:
the primary air pipe of the integrated pulverized coal burner comprises a square and round joint, a straight pipe section and a nozzle, wherein the nozzle consists of an outer nozzle sleeved inside and outside and an inner nozzle made of silicon carbide ceramic;
the square and round joint is communicated with the tail end of the straight pipe section, and the front end of the nozzle is detachably connected with the head end of the straight pipe section;
and silicon carbide ceramic inner liners are arranged on the inner walls of the square and round joints and the straight pipe sections.
Furthermore, the front end of the straight pipe section is provided with an annular tongue-and-groove, the annular tongue-and-groove and the nozzle are provided with pin holes, and the annular tongue-and-groove and the nozzle are connected into a whole through the bolt matched with the pin holes.
Further, the thickness of the silicon carbide ceramic lining layer is 16-20mm.
Further, the internal dimensions of the straight tube section are 400-420mm x 350-370mm.
Compared with the prior art, the utility model has the following beneficial effects:
1. the outer nozzle and the inner nozzle made of silicon carbide ceramic material form a nozzle to replace the conventional nozzle made of heat-resistant steel, so that the service life of the nozzle is effectively prolonged, the durability of the nozzle is improved, the primary air pipe is not flushed, and the service life of the primary air pipe is integrally prolonged;
2. the inner walls of the square and round joints and the straight pipe sections are provided with silicon carbide ceramic lining layers, so that the overall durability is improved, and the service life is prolonged;
3. the annular tongue-and-groove is connected with the nozzle into a whole through the bolt matching pin hole, so that the convenience in disassembly and assembly of the nozzle and the straight pipe section is ensured, and the regular maintenance and replacement are facilitated.
Drawings
FIG. 1 is a schematic view of a primary air duct of an integrated pulverized coal burner according to the present utility model;
FIG. 2 is a schematic view of the inside of a primary air duct of the integrated pulverized coal burner according to the present utility model;
in the figure: 1. square and round joints, 2, straight pipe sections, 3, outer nozzles, 4, inner nozzles, 5, annular tongue-and-groove, 6, pin holes, 7 and silicon carbide ceramic lining layers.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the utility model, it should be understood that the terms "front," "rear," "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience in describing the utility model and simplifying the description, and do not indicate or imply that the device or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.
As shown in fig. 1-2, this embodiment discloses an integral pulverized coal burner primary air pipe, which comprises a square round joint 1, a straight pipe section 2 and a nozzle, wherein the straight pipe section 2 is provided with a square long pipe, the internal dimension of the straight pipe section 2 is 410mm multiplied by 366mm, and the nozzle consists of an outer nozzle 3 sleeved inside and outside and an inner nozzle 4 made of silicon carbide ceramic. The square and round joint 1 is communicated with the tail end of the straight pipe section 2, an annular tongue-and-groove 5 is processed at the front end of the straight pipe section 2, two pin holes 6 are formed in the annular tongue-and-groove and the nozzle, and the annular tongue-and-groove and the nozzle are connected into a whole through the bolt matched pin holes. Thereby realizing the detachable connection of the front end of the nozzle and the head end of the straight pipe section 2.
In order to improve the overall durability, silicon carbide ceramic inner liners 7 are arranged on the inner walls of the square and round joint 1 and the straight pipe section 2, and the thickness of each silicon carbide ceramic inner liner is 16mm.
According to the utility model, on the premise of not changing the design size of the original primary air pipe nozzle, the inner nozzle and the outer nozzle for manufacturing silicon carbide in the nozzle are realized, so that the primary air pipe is effectively protected from being washed, the service life of the primary air pipe is prolonged to 3 years from the original service life, the requirements of prolonging the running period of the boiler can be met, and the maintenance cost of the primary air pipe can be saved.
Claims (4)
1. The primary air pipe of the integrated pulverized coal burner is characterized by comprising a square and round joint, a straight pipe section and a nozzle, wherein the nozzle consists of an outer nozzle sleeved inside and outside and an inner nozzle made of silicon carbide ceramic;
the square and round joint is communicated with the tail end of the straight pipe section, and the front end of the nozzle is detachably connected with the head end of the straight pipe section;
and silicon carbide ceramic inner liners are arranged on the inner walls of the square and round joints and the straight pipe sections.
2. The primary air pipe of the integrated pulverized coal burner as claimed in claim 1, wherein the front end of the straight pipe section is provided with an annular tongue-and-groove, the annular tongue-and-groove and the nozzle are provided with pin holes, and the annular tongue-and-groove and the nozzle are connected into a whole through the bolt matching pin holes.
3. The primary air duct of an integrated pulverized coal burner as claimed in claim 1, wherein the thickness of the silicon carbide ceramic inner liner is 16-20mm.
4. A primary air duct of an integrated pulverized coal burner as claimed in any one of claims 1 to 3, characterized in that the internal dimensions of the straight tube sections are 400-420mm x 350-370mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320715550.6U CN219735379U (en) | 2023-04-04 | 2023-04-04 | Primary air pipe of integrated pulverized coal burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320715550.6U CN219735379U (en) | 2023-04-04 | 2023-04-04 | Primary air pipe of integrated pulverized coal burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219735379U true CN219735379U (en) | 2023-09-22 |
Family
ID=88032050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320715550.6U Active CN219735379U (en) | 2023-04-04 | 2023-04-04 | Primary air pipe of integrated pulverized coal burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219735379U (en) |
-
2023
- 2023-04-04 CN CN202320715550.6U patent/CN219735379U/en active Active
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