CN213513915U - High-efficient sulphur waste liquid that contains burns burning furnace - Google Patents
High-efficient sulphur waste liquid that contains burns burning furnace Download PDFInfo
- Publication number
- CN213513915U CN213513915U CN202021764559.9U CN202021764559U CN213513915U CN 213513915 U CN213513915 U CN 213513915U CN 202021764559 U CN202021764559 U CN 202021764559U CN 213513915 U CN213513915 U CN 213513915U
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- China
- Prior art keywords
- waste liquid
- sulfur
- containing waste
- barrel
- incinerator
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- 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.)
- Expired - Fee Related
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- 239000007788 liquid Substances 0.000 title claims abstract description 65
- 239000002699 waste material Substances 0.000 title claims abstract description 62
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 239000005864 Sulphur Substances 0.000 title claims abstract description 18
- 238000002156 mixing Methods 0.000 claims abstract description 20
- 239000007921 spray Substances 0.000 claims abstract description 17
- 229910052717 sulfur Inorganic materials 0.000 claims description 35
- 239000011593 sulfur Substances 0.000 claims description 35
- 239000000571 coke Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 6
- 238000010008 shearing Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 20
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 18
- 239000007789 gas Substances 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- SOIFLUNRINLCBN-UHFFFAOYSA-N ammonium thiocyanate Chemical compound [NH4+].[S-]C#N SOIFLUNRINLCBN-UHFFFAOYSA-N 0.000 description 1
- XYXNTHIYBIDHGM-UHFFFAOYSA-N ammonium thiosulfate Chemical compound [NH4+].[NH4+].[O-]S([O-])(=O)=S XYXNTHIYBIDHGM-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The utility model discloses a high-efficient sulphur waste liquid incinerator that contains, it includes the furnace body of horizontal drum type, locate sulphur waste liquid spray gun and the supplementary burner on the furnace body front end lateral wall, locate in the furnace body and along the sieve mesh wall that the fore-and-aft direction was arranged in proper order, sulphur waste liquid spray gun includes sulphur waste liquid inlet tube, the mixed flow ware, mix room and gun barrel outward, be equipped with sulphur waste liquid inlet tube on the preceding tip of mixed flow ware, be equipped with the compressed air inlet tube on the mixed flow ware global, be equipped with the combustion-supporting air inlet tube on the outer global that mixes the room, the back tip of mixed flow ware is connected with the preceding tip of mixing. This high-efficient sulphur waste liquid incinerator that contains adopts flow characteristic and atomization characteristic best and with the good outer type spray gun that mixes of supplementary combustor matching nature, rely on atomizing medium (compressed air) and the high-speed collision, the shearing of containing sulphur waste liquid, rotation as atomizing power, form the bubble through the motion, warp, accelerate until export overall process such as microexplosion reach good atomizing.
Description
Technical Field
The utility model relates to a high-efficient sulphur waste liquid that contains burns burning furnace.
Background
Numerous enterprises in the existing petrochemical, chemical, steel, coal gasification and other industries in China can produce a large amount of waste liquid rich in salts such as sulfur, ammonium thiocyanate, ammonium thiosulfate and the like in the process of producing main target products respectively, the waste liquid contains various chemical components, but the main components are salts, so that the waste liquid is strong in corrosivity, and the environment can be seriously polluted and the health of human beings can be harmed due to the fact that the waste liquid is directly discharged in a large amount for a long time. The waste liquid is treated by adopting an incineration method, furnace gas which generates sulfur dioxide by combustion is used for producing the product-grade sulfuric acid, the problem is fundamentally solved, the waste sulfuric acid resource is recycled, and the environment-friendly concept of low-carbon production and high-efficiency utilization is practically practiced. The preparation of sulfuric acid by incineration is a clean production process which meets the environmental protection requirement, and has great environmental benefit, social benefit and economic benefit.
Disclosure of Invention
The utility model aims at providing a high-efficient sulphur waste liquid incinerator that contains.
In order to achieve the above purpose, the utility model adopts the technical scheme that: the utility model provides a high-efficient sulphur waste liquid incinerator, its includes horizontal cylindrical furnace body, locates contain sulphur waste liquid spray gun and supplementary combustor on the furnace body front end lateral wall, locate in the furnace body and along the sieve mesh wall that the fore-and-aft direction was arranged in proper order, contain sulphur waste liquid spray gun including contain sulphur waste liquid inlet tube, mixed flow ware, outer mixing chamber and gun barrel, be equipped with on the front end portion of mixed flow ware and contain sulphur waste liquid inlet tube, be equipped with the compressed air inlet tube on the mixed flow ware global, be equipped with the combustion-supporting air inlet tube on the peripheral of outer mixing chamber, the rear end portion of mixed flow ware with the front end portion of outer mixing chamber is connected.
In another preferred mode, the compressed air inlet pipe comprises a pipe body and a baffle piece arranged in the pipe body, wherein the baffle piece is used for forming a whole air outlet at the front part and a dispersed air outlet at the rear part in the pipe body.
In another preferred mode, the compressed air inlet pipe is located below the mixer, the baffle is arranged on the upper end opening of the pipe body and is arranged at the rear side, a plurality of small holes are formed in the baffle, the upper end opening of the pipe body forms a main air outlet with the front part integrated into a whole, and a plurality of densely distributed auxiliary air outlets are formed in the rear part of the pipe body.
In another preferred form, the apertures have a diameter of less than 5 mm.
In another preferred mode, the baffle is arranged in the tube body and close to the rear side, dispersing holes penetrating through the baffle and the side wall of the tube body are formed in the baffle, the dispersing holes are arranged on the baffle in a dispersing mode, the lower ends of the dispersing holes are gathered, and the upper ends of the dispersing holes are distributed in a dispersing mode.
In another preferred mode, the auxiliary burner includes an introduction cylinder, an incandescent lamp gas inlet is provided at a front end of the introduction cylinder, a combustion air inlet is provided at an upper portion of a circumferential surface of the introduction cylinder, a main coke oven gas inlet is provided at a lower portion of the introduction cylinder, a rear end of the introduction cylinder is provided in the oven body, a rear end of the introduction cylinder is divided into a primary central region and a secondary combustion zone, the primary central region includes a primary combustion tube and an impeller provided at the rear end of the introduction cylinder, the impeller is rotatably connected to the rear end of the introduction cylinder, the secondary combustion zone includes a secondary combustion tube, and the secondary combustion tube is located behind the primary combustion tube.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages: the high-efficiency sulfur-containing waste liquid incinerator adopts an external mixing type sulfur-containing waste liquid spray gun which has the best flow characteristic and atomization characteristic and good matching with the auxiliary burner 2, the atomization mechanism is advanced to the current spray technology which is widely applied internationally, the high-efficiency sulfur-containing waste liquid incinerator does not rely on the high sulfur-containing waste liquid pressure as atomization power, but relies on the high-speed collision, shearing and rotation of an atomization medium (compressed air) and the sulfur-containing waste liquid as atomization power, and bubbles are formed to achieve good atomization through the whole processes of movement, deformation, acceleration, micro-explosion of an outlet and the like; the spray gun for atomized sulfur-containing waste liquid is characterized in that the sulfur-containing waste liquid is sprayed into an outer mixing chamber from a sulfur-containing waste liquid inlet pipe and a mixer, compressed air is sprayed into the outer mixing chamber through a compressed air inlet pipe and the mixer at a high speed, the compressed air is fully mixed with the sulfur-containing waste liquid in the outer mixing chamber to enable the sulfur-containing waste liquid to form a large number of waste liquid bubbles in the outer mixing chamber, and the waste liquid bubbles are broken under the action of pressure difference between the thin bubbles and combustion air at the position of a gun barrel outlet after a series of processes such as movement, deformation, acceleration and the like, so that liquid drops which are very small in liquid drop, large in size uniformity and fully and uniformly.
The auxiliary burner adopts low-nitrogen combustion technology to reduce the generation of nitrogen oxides. Particularly, a combustion air classification method is adopted, namely, fuel gas completely enters from an auxiliary burner (which is sprayed out in the burner in different directions), meanwhile, the fuel gas is combusted in a grading way, a primary central area is of a multi-gun and multi-nozzle structure, a secondary combustion area is of a multi-gun structure and is dispersed around the central area, combustion-supporting air enters from two parts, the first part enters from the primary central area, the second part enters from the middle part of the furnace body from the secondary combustion area, so that the excess air coefficient in the primary central area is reduced at the initial stage of combustion, meanwhile, the coke oven gas is sprayed at a high speed to suck the low-temperature flue gas in the incinerator at the later stage, the concentrated heat of the combustor is diluted by adopting the internal circulation of the flue gas, the temperature field is uniform, the generation of thermal nitrogen oxides is reduced, the excess air coefficient alpha of the sulfur-containing waste liquid at the front part of the incinerator body is less than 1, and the generation of fuel nitrogen oxides is inhibited.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of a sulfur-containing waste liquid spray gun;
FIG. 3 is a top view of a compressed air inlet tube according to one embodiment;
FIG. 4 is a sectional view of a compressed air inlet tube in accordance with one embodiment;
FIG. 5 is a sectional view of a compressed air inlet pipe in the second embodiment;
FIG. 6 is a schematic view of the auxiliary burner.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature. It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.
Example one
The high-efficiency sulfur-containing waste liquid incinerator comprises a horizontal cylindrical furnace body 3, a sulfur-containing waste liquid spray gun 1 and an auxiliary burner 2 which are arranged on the side wall of the front end of the furnace body 3, a sieve mesh wall 4 which is arranged in the furnace body and is sequentially arranged along the front-back direction, and an exhaust port 5 which is arranged on the side wall of the rear end of the furnace body.
The sulfur-containing waste liquid spray gun 1 comprises a mixer 11, an outer mixing chamber 12 and a gun barrel 13, wherein a sulfur-containing waste liquid inlet pipe 14 is arranged at the front end of the mixer 11, a compressed air inlet pipe 15 is arranged on the circumferential surface of the mixer 11, a combustion-supporting air inlet pipe 16 is arranged on the circumferential surface of the outer mixing chamber 12, the rear end of the mixer 11 is connected with the front end of the outer mixing chamber 12, and the front end of the gun barrel 13 is not connected with the rear end of the outer mixing chamber 12. The compressed air inlet tube 15 includes a tube 151, and a baffle 152 disposed in the tube 151 to form a front portion of the tube as an integral air outlet and a rear portion of the tube as a discrete air outlet. The compressed air inlet pipe is located below the mixer, the blocking piece is arranged on the upper end opening of the pipe body and is arranged at the rear side, a plurality of small holes 153 are formed in the blocking piece, the upper end opening of the pipe body forms a main air outlet with the front part integrated, and the rear part of the pipe body is a plurality of densely distributed auxiliary air outlets. The diameter of the small hole is less than 5 mm.
The auxiliary burner 2 comprises a guide-in cylinder 21, the front end part of the guide-in cylinder 21 is provided with an ever-burning lamp gas inlet 29, the upper part of the peripheral surface of the guide-in cylinder 21 is provided with a burning air inlet 22, the lower part of the guide-in cylinder is provided with a main coke oven gas inlet 23, the rear end part of the guide-in cylinder 21 is arranged in the furnace body 3, the rear end part of the guide-in cylinder is divided into a primary central area 24 and a secondary burning area 25, the primary central area 24 comprises a primary burning pipe 26 and an impeller 27 which are arranged on the rear end part of the guide-in cylinder, the impeller is rotationally connected to the rear end part of the guide-in cylinder, the secondary burning area 25 comprises a secondary burning pipe 28, and the secondary burning pipe.
Example two
As shown in fig. 6, the present embodiment is different from the first embodiment in that: the baffle 152 may be disposed in the tube body near the rear side, and has a dispersing hole 154 penetrating through itself and the side wall of the tube body, the dispersing hole is disposed on the baffle in a diverging manner, the lower ends of the dispersing holes are gathered, and the upper ends are distributed dispersedly.
The atomization mechanism of the sulfur-containing waste liquid spray gun is advanced to the current spray technology widely applied internationally, and the sulfur-containing waste liquid spray gun does not rely on high sulfur-containing waste liquid pressure as atomization power, but relies on high-speed collision, shearing and rotation of an atomization medium (compressed air) and the sulfur-containing waste liquid as atomization power to form bubbles to achieve good atomization through the whole processes of movement, deformation, acceleration to micro-explosion at an outlet and the like; the spray gun for atomized sulfur-containing waste liquid is characterized in that the sulfur-containing waste liquid is sprayed into an outer mixing chamber from a sulfur-containing waste liquid inlet pipe and a mixer, compressed air is sprayed into the outer mixing chamber through a compressed air inlet pipe and the mixer at a high speed, the compressed air is fully mixed with the sulfur-containing waste liquid in the outer mixing chamber to enable the sulfur-containing waste liquid to form a large number of waste liquid bubbles in the outer mixing chamber, and the waste liquid bubbles are broken under the action of pressure difference between the thin bubbles and combustion air at the position of a gun barrel outlet after a series of processes such as movement, deformation, acceleration and the like, so that liquid drops which are very small in liquid drop, large in size uniformity and fully and uniformly.
The auxiliary burner adopts low-nitrogen combustion technology to reduce the generation of nitrogen oxides. Particularly, a combustion air classification method is adopted, namely, fuel gas completely enters from an auxiliary burner (which is sprayed out in the burner in different directions), meanwhile, the fuel gas is combusted in a grading way, a primary central area is of a multi-gun and multi-nozzle structure, a secondary combustion area is of a multi-gun structure and is dispersed around the central area, combustion-supporting air enters from two parts, the first part enters from the primary central area, the second part enters from the middle part of the furnace body from the secondary combustion area, so that the excess air coefficient in the primary central area is reduced at the initial stage of combustion, meanwhile, the coke oven gas is sprayed at a high speed to suck the low-temperature flue gas in the incinerator at the later stage, the concentrated heat of the combustor is diluted by adopting the internal circulation of the flue gas, the temperature field is uniform, the generation of thermal nitrogen oxides is reduced, the excess air coefficient alpha of the sulfur-containing waste liquid at the front part of the incinerator body is less than 1, and the generation of fuel nitrogen oxides is inhibited.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (6)
1. The utility model provides a high-efficient sulphur waste liquid incinerator that contains, its furnace body that includes horizontal cylinder type locates contain sulphur waste liquid spray gun and supplementary combustor on the lateral wall of furnace body front end, locate in the furnace body and along the sieve mesh wall that the fore-and-aft direction was arranged in proper order, its characterized in that: the sulfur-containing waste liquid spray gun comprises a sulfur-containing waste liquid inlet pipe, a mixer, an outer mixing chamber and a gun barrel, wherein the sulfur-containing waste liquid inlet pipe is arranged at the front end part of the mixer, a compressed air inlet pipe is arranged on the peripheral surface of the mixer, a combustion-supporting air inlet pipe is arranged on the peripheral surface of the outer mixing chamber, and the rear end part of the mixer is connected with the front end part of the outer mixing chamber.
2. The incinerator for sulfur-containing waste liquid as claimed in claim 1, wherein: the compressed air inlet pipe comprises a pipe body and a baffle piece which is arranged in the pipe body, wherein the front portion of the baffle piece is an integral air outlet, and the rear portion of the baffle piece is a dispersed air outlet.
3. The incinerator for sulfur-containing waste liquid as claimed in claim 2, wherein: the compressed air inlet pipe is located below the mixer, the blocking piece is arranged on the upper end opening of the pipe body and is arranged at the rear side, a plurality of small holes are formed in the blocking piece, the upper end opening of the pipe body forms a main air outlet with the front part integrated, and the rear part of the pipe body is a plurality of densely distributed auxiliary air outlets.
4. The incinerator for sulfur-containing waste liquid as claimed in claim 3, wherein: the diameter of the small hole is less than 5 mm.
5. The incinerator for sulfur-containing waste liquid as claimed in claim 2, wherein: the baffle is arranged in the tube body and close to the rear side, a dispersing hole penetrating through the baffle and the side wall of the tube body is formed in the baffle, the dispersing hole is arranged on the baffle in a dispersing mode, the lower end of the dispersing hole is gathered, and the upper end of the dispersing hole is distributed in a dispersing mode.
6. The incinerator for sulfur-containing waste liquid as claimed in claim 1, wherein: the auxiliary burner comprises a guide-in barrel, the front end part of the guide-in barrel is provided with an ever-burning lamp gas inlet, the upper part of the peripheral surface of the guide-in barrel is provided with a burning air inlet, the lower part of the guide-in barrel is provided with a main coke oven gas inlet, the rear end part of the guide-in barrel is arranged in the oven body, the rear end part of the guide-in barrel is divided into a primary central area and a secondary burning area, the primary central area comprises a primary burning pipe and an impeller which are arranged on the rear end part of the guide-in barrel, the impeller is rotationally connected to the rear end part of the guide-in barrel, the secondary burning area comprises a secondary burning pipe, and the secondary burning pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021764559.9U CN213513915U (en) | 2020-08-21 | 2020-08-21 | High-efficient sulphur waste liquid that contains burns burning furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021764559.9U CN213513915U (en) | 2020-08-21 | 2020-08-21 | High-efficient sulphur waste liquid that contains burns burning furnace |
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| Publication Number | Publication Date |
|---|---|
| CN213513915U true CN213513915U (en) | 2021-06-22 |
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ID=76441263
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021764559.9U Expired - Fee Related CN213513915U (en) | 2020-08-21 | 2020-08-21 | High-efficient sulphur waste liquid that contains burns burning furnace |
Country Status (1)
| Country | Link |
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| CN (1) | CN213513915U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659124A (en) * | 2022-05-25 | 2022-06-24 | 沧州中铁装备制造材料有限公司 | Environment-friendly efficient treatment desulfurization sulfur foam generating incinerator |
-
2020
- 2020-08-21 CN CN202021764559.9U patent/CN213513915U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659124A (en) * | 2022-05-25 | 2022-06-24 | 沧州中铁装备制造材料有限公司 | Environment-friendly efficient treatment desulfurization sulfur foam generating incinerator |
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| CF01 | Termination of patent right due to non-payment of annual fee |
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