CN210399972U - High-efficient gasification low-nitrogen combustion technology device of cement dore furnace buggy - Google Patents
High-efficient gasification low-nitrogen combustion technology device of cement dore furnace buggy Download PDFInfo
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- CN210399972U CN210399972U CN201921220983.4U CN201921220983U CN210399972U CN 210399972 U CN210399972 U CN 210399972U CN 201921220983 U CN201921220983 U CN 201921220983U CN 210399972 U CN210399972 U CN 210399972U
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- reducing gas
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- duct
- gas inlet
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 22
- 238000002309 gasification Methods 0.000 title claims abstract description 22
- 239000004568 cement Substances 0.000 title claims abstract description 15
- 238000005516 engineering process Methods 0.000 title claims abstract description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title abstract description 18
- 229910052757 nitrogen Inorganic materials 0.000 title abstract description 11
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 26
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000003245 coal Substances 0.000 claims description 40
- 238000005192 partition Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 64
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 22
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 21
- 239000000843 powder Substances 0.000 description 13
- 229910000019 calcium carbonate Inorganic materials 0.000 description 11
- 239000002994 raw material Substances 0.000 description 8
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 4
- 235000012054 meals Nutrition 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229940098458 powder spray Drugs 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Abstract
The embodiment of the utility model provides a low nitrogen combustion technology device of cement dore furnace buggy high-efficient gasification is related to, the device includes: the upper part of the side wall of the decomposition furnace is provided with at least one material inlet and at least one first reducing gas inlet; at least one second reducing gas inlet and at least one high-temperature gas inlet are formed in the lower portion of the side wall of the decomposing furnace; a reducing gas delivery duct comprising at least one first branch duct communicating to the first reducing gas inlet, and at least one second branch duct communicating to the second reducing gas inlet; and the high-temperature gas conveying pipeline comprises at least one third branch pipeline communicated to the high-temperature gas inlet.
Description
Technical Field
The embodiment of the utility model provides a relate to cement manufacture equipment technical field, especially relate to a low nitrogen combustion technology device of high-efficient gasification of cement dore furnace buggy.
Background
The novel dry cement production technology is a mature cement production technology at present, in a combustion system of a decomposing furnace, high-temperature tertiary air and heat released by pulverized coal combustion are used as heat sources for decomposing calcium carbonate, so that raw materials are converted into calcium oxide powder, then the calcium oxide powder enters a rotary kiln system to be calcined into clinker, and the clinker is separated by a grate cooler and then sent to an assembly workshop to be packed into finished products.
At present, the cement industry generally adopts a staged combustion technology to control the emission of nitrogen oxides in the combustion process of a decomposing furnace, air required by fuel combustion enters in two stages, the excess air coefficient of a main combustion area in the furnace is low, a reduction area is formed, and on the basis of inhibiting the generation of fuel type nitrogen oxides, part of thermal type nitrogen oxides in kiln tail flue gas can be reduced into nitrogen. However, since the injection port of the raw material is located at the upper portion of the decomposing furnace and the reduction zone is located at the lower portion of the decomposing furnace, i.e., the combustion reaction occurs at the lower portion of the furnace body, the furnace body is locally overheated, and there is a certain safety risk.
SUMMERY OF THE UTILITY MODEL
In view of this, for solving the dore furnace among the prior art and easily forming local overheat in the combustion decomposition process, have the defect of certain potential safety hazard, utilize the gaseous characteristic desorption of reducing most nitrogen oxide simultaneously, the embodiment of the utility model provides a low nitrogen combustion technology device of cement dore furnace pulverized coal high-efficient gasification.
In a first aspect, an embodiment of the utility model provides a low nitrogen combustion technology device of cement dore furnace pulverized coal high-efficient gasification, the device includes:
the upper part of the side wall of the decomposition furnace is provided with at least one material inlet and at least one first reducing gas inlet;
at least one second reducing gas inlet and at least one high-temperature gas inlet are formed in the lower portion of the side wall of the decomposing furnace;
a reducing gas delivery duct comprising at least one first branch duct communicating to the first reducing gas inlet, and at least one second branch duct communicating to the second reducing gas inlet;
and the high-temperature gas conveying pipeline comprises at least one third branch pipeline communicated to the high-temperature gas inlet.
In one possible embodiment, the upper part of the side wall of the decomposition furnace comprises a material inlet and two horizontally arranged first reducing gas inlets, wherein the two horizontally arranged first reducing gas inlets are symmetrically distributed on two sides of the material inlet.
In a possible embodiment, the decomposition furnace comprises an upper main body and a lower cone, comprising a second reducing gas inlet, located on the side wall of the cone near the bottom.
In one possible embodiment, the apparatus further comprises a gasification furnace in communication with the reducing gas delivery conduit.
In a possible embodiment, the high-temperature gas delivery pipeline further includes a fourth branch pipeline, one end of the fourth branch pipeline is communicated with the third branch pipeline, and the other end of the fourth branch pipeline is communicated with the gasification furnace.
In one possible embodiment, the fourth branch pipe outlet is located at the top of the gasification furnace.
In one possible embodiment, the reducing gas supplying pipe further includes a first main pipe communicating with both the first branch pipe and the second branch pipe, and the high temperature gas supplying pipe further includes a second main pipe communicating with the third branch pipe, and the first main pipe and the second main pipe are partitioned by a partition plate extending in an axial direction and disposed at the center of one pipe.
In one possible embodiment, a pulverized coal burner is connected to the end of the first main channel remote from the decomposing furnace, and the excess air ratio in the pulverized coal burner is less than 1.
In one possible embodiment, the high-temperature gas conveying pipeline comprises two horizontally arranged third branch pipelines communicated to the high-temperature gas inlet, and the third branch pipelines are symmetrically distributed on two sides of the decomposing furnace.
In one possible embodiment, the apparatus further comprises a smoke chamber located below the decomposition furnace, communicating with the bottom of the decomposition furnace.
The embodiment of the utility model provides a cement decomposition device, first branch pipeline among the reducing gas pipeline communicates to the first reducing gas entry on dore furnace upper portion, second branch pipeline communicates to the second reducing gas entry of dore furnace lower part, reducing gas not only can be in the lower part of dore furnace and the NOx reaction in the stove like this, reduce the concentration of interior NOx of stove, but also can be for the raw meal that gets into in the stove through the material import on upper portion decomposes the heat supply, make its heat of giving out absorb by the raw meal sooner, when improving the raw meal decomposition rate, guarantee endothermic homogeneity, prevent that the raw meal from just beginning to carry out the local overheat phenomenon that endothermic reaction caused after descending to the furnace body bottom, the safety of furnace body has been ensured.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be 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 described in the embodiments of the present specification, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic diagram of the overall structure of a technical device for efficiently gasifying and combusting low-nitrogen in cement decomposing furnace coal powder of the embodiment of the utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
To facilitate understanding of the embodiments of the present invention, the following description will be made in terms of specific embodiments with reference to the accompanying drawings, which are not intended to limit the embodiments of the present invention.
As shown in fig. 1, for the embodiment of the present invention provides an overall structural schematic diagram of a low-nitrogen combustion technical apparatus for high-efficiency gasification of pulverized coal in a cement decomposing furnace, in an embodiment, the apparatus may include: a decomposing furnace 1, a reducing gas conveying pipeline and a high-temperature gas conveying pipeline.
For the decomposing furnace 1, a material inlet and two horizontally arranged first reducing gas inlets are arranged at the upper part of the side wall of the decomposing furnace, wherein the two horizontally arranged first reducing gas inlets are symmetrically distributed at two sides of the material inlet. A material inlet is provided with a discharging pipe 2, and calcium carbonate to be decomposed enters a decomposing furnace 1 through the discharging pipe 2.
The decomposition furnace lateral wall lower part sets up a second reducing gas entry to and the high-temperature gas entry that two horizontal symmetries set up, the embodiment of the utility model provides a high-temperature gas is that the fuel that is used for providing in the decomposition furnace burns out required oxygen volume and thermal gas.
The decomposing furnace 1 comprises a main body arranged on the upper part and a cone arranged on the lower part, and the second reducing gas inlet is positioned on the side wall of the cone close to the bottom and is used for reducing nitrogen oxides in the furnace body.
And the reducing gas conveying pipeline comprises two first branch pipelines 3 communicated to the first reducing gas inlet and two second branch pipelines 4 communicated to the second reducing gas inlet.
The high-temperature gas conveying pipeline comprises two horizontally arranged third branch pipelines 5 which are respectively communicated to the two high-temperature gas inlets, and the two third branch pipelines 5 are symmetrically distributed on two sides of the decomposing furnace 1.
The other end of the reducing gas supply line is connected to the gasification furnace 7, the pulverized coal is supplied to the gasification furnace 7 and partially combusted to generate a reducing gas, and the reducing gas is supplied to the upper and lower parts of the decomposition furnace 1 through the first branch line 3 and the second branch line 4, respectively.
In order to ensure the heat required by the combustion of pulverized coal in the gasification furnace 7, the reducing gas conveying pipeline further comprises a fourth branch pipeline 8, one end of the fourth branch pipeline 8 is communicated with the third branch pipeline 5, the other end of the fourth branch pipeline is communicated with the gasification furnace 7, and the outlet of the fourth branch pipeline 8 is positioned at the top of the gasification furnace 7.
In order to smoothly feed the decomposed calcium oxide powder into the rotary kiln for calcination, a smoke chamber 6 communicated with the decomposition furnace 1 is further arranged at the bottom below the decomposition furnace 1, and the other end of the smoke chamber 6 is connected into the rotary kiln.
Raw coal enters a coal mill from a coal bunker, the coal mill grinds the raw coal into coal powder, and the coal powder is sprayed into the gasification furnace 7 through a coal powder spray pipe by coal conveying air. The coal dust absorbs the heat that high temperature gas pipeline's fourth branch road pipeline 8 provided in gasifier 7, carry out the partial combustion and release the heat, the coal gas that the partial combustion generated and semicoke mixture partly carry to the upper portion of dore furnace 1 through two first branch road pipelines 3 simultaneously, treat simultaneously that the calcium carbonate that decomposes gets into dore furnace 1 by unloading pipe 2 in, the heat exchange takes place after the two mixes, calcium carbonate absorbs partly heat here and carries out the partial decomposition, then fall to the bottom of dore furnace 1. The other part of the mixture of the coal gas and the semicoke generated by partial combustion is conveyed to the lower part of the decomposing furnace 1 through a second branch pipeline 4, reacts with the nitrogen oxide in the furnace and is reduced into nitrogen; meanwhile, the high-temperature gas conveying pipeline provides oxygen and heat required by the calcium carbonate in the decomposing furnace 1 to be burnt out through the third branch pipeline 5, and complete decomposition of the calcium carbonate is guaranteed. The decomposed calcium oxide powder is conveyed to the rotary kiln through a smoke chamber 6 below the decomposing furnace 1 for subsequent reaction.
In addition, the material inlet and the first reducing gas inlet can be symmetrically arranged relative to the decomposing furnace, and the quantity can be set according to requirements.
In order to reduce the cost, the reducing gas conveying pipeline further comprises a first main pipeline communicated with the first branch pipeline 3 and the second branch pipeline 4, the high-temperature gas conveying pipeline further comprises a second main pipeline communicated with the third branch pipeline 5, and the first main pipeline and the second main pipeline are separated by a partition plate which is arranged in the center of one pipeline and extends along the axial direction. Wherein, the baffle is high temperature resistant alloy material, fixes in pipeline central authorities through the welding.
In order to ensure that the pulverized coal is gasified in a sufficient distance, the pulverized coal burner is arranged at one end of the first main pipeline, which is far away from the decomposing furnace 1, and the excess air coefficient in the pulverized coal burner is less than 1, even less than 0.5, so that the pulverized coal is gasified under the condition of insufficient air to generate the pulverized coal containing CO and H2The reducing gas of (2).
Raw coal enters a coal mill from a coal bunker, the coal mill grinds the raw coal into coal powder, and the coal powder is sprayed into a coal powder burner through a coal powder spray pipe by coal conveying air. The coal powder is partially combusted in the coal powder combustor to release heat, one part of a mixture of coal gas and semicoke generated by partial combustion is simultaneously conveyed to the upper part of the decomposing furnace 1 through two first branch pipelines 3, calcium carbonate to be decomposed simultaneously enters the decomposing furnace 1 through the discharging pipe 2, heat exchange occurs after the calcium carbonate and the decomposing furnace are mixed, and the calcium carbonate absorbs one part of heat to be partially decomposed and then falls to the bottom of the decomposing furnace 1. The other part of the mixture of the coal gas and the semicoke generated by partial combustion is conveyed to the lower part of the decomposing furnace 1 through a second branch pipeline 4, reacts with the nitrogen oxide in the furnace and is reduced into nitrogen; meanwhile, the high-temperature gas conveying pipeline provides oxygen and heat required by the calcium carbonate in the decomposing furnace 1 to be burnt out through the third branch pipeline 5, and complete decomposition of the calcium carbonate is guaranteed. The decomposed calcium oxide powder is conveyed to the rotary kiln through a smoke chamber 6 below the decomposing furnace 1 for subsequent reaction.
Through the aforesaid to the utility model discloses cement decomposition device's that the embodiment provided description:
1. the first branch pipeline in the reducing gas conveying pipeline is communicated to a first reducing gas inlet at the upper part of the decomposing furnace, and the second branch pipeline is communicated to a second reducing gas inlet at the lower part of the decomposing furnace, so that the reducing gas can react with NOx in the decomposing furnace at the lower part of the decomposing furnace to reduce the concentration of the NOx in the furnace, heat can be provided for decomposing raw materials entering the furnace through a material inlet at the upper part, the heat emitted by the raw materials can be absorbed by the raw materials more quickly, the decomposition rate of the raw materials is improved, the uniformity of heat absorption is ensured, the local overheating phenomenon caused by the fact that the raw materials begin to perform heat absorption reaction after falling to the bottom of the furnace body is prevented, and the safety of the;
2. the two first reducing gas inlets are symmetrically distributed at two sides of the material inlet, so that the uniformity of heat absorption of the raw material can be ensured to the maximum extent, and the decomposition rate is improved;
3. the outlet of the fourth branch pipeline of the high-temperature gas conveying pipeline is communicated to the top of the gasification furnace, so that the high-temperature gas is conveyed into the gasification furnace from top to bottom, the pulverized coal in the gasification furnace can be better heated, the gasified mixture is conveyed to a corresponding position as soon as possible, and the waste of heat is avoided;
4. the first main pipeline of the reducing gas conveying pipeline and the second main pipeline of the high-temperature gas conveying pipeline are formed by a partition plate which is arranged in the center of one pipeline and extends along the axial direction in a separating mode; one end of the first main path pipeline, which is far away from the decomposing furnace, is connected with a pulverized coal burner, and the excess air coefficient in the pulverized coal burner is less than 1. Therefore, the supply of the reducing gas can be realized without arranging a gasification furnace, the structure of the whole device is simpler, and the cost is lower.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
The above-mentioned embodiments, further detailed description of the objects, technical solutions and advantages of the present invention, it should be understood that the above description is only the embodiments of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a low NOx combustion technology device of high-efficient gasification of cement dore buggy which characterized in that, the device includes:
the upper part of the side wall of the decomposition furnace is provided with at least one material inlet and at least one first reducing gas inlet;
at least one second reducing gas inlet and at least one high-temperature gas inlet are formed in the lower portion of the side wall of the decomposing furnace;
a reducing gas delivery duct comprising at least one first branch duct communicating to the first reducing gas inlet, and at least one second branch duct communicating to the second reducing gas inlet;
and the high-temperature gas conveying pipeline comprises at least one third branch pipeline communicated to the high-temperature gas inlet.
2. The apparatus of claim 1, wherein the upper portion of the side wall of the decomposition furnace comprises a material inlet and two horizontally arranged first reducing gas inlets, wherein the two horizontally arranged first reducing gas inlets are symmetrically distributed on both sides of the material inlet.
3. The apparatus of claim 1, wherein the decomposition furnace comprises an upper body and a lower cone, and a second reducing gas inlet is provided in the side wall of the cone near the bottom.
4. The apparatus of any one of claims 1 to 3, further comprising a gasifier in communication with the reducing gas delivery conduit.
5. The apparatus according to claim 4, wherein the high temperature gas delivery pipe further comprises a fourth branch pipe, one end of the fourth branch pipe is communicated with the third branch pipe, and the other end of the fourth branch pipe is communicated with the gasification furnace.
6. The apparatus of claim 5, wherein the fourth branch conduit outlet is located at a top of the gasifier.
7. The apparatus according to claim 1, wherein the reducing gas supplying duct further includes a first main duct communicating with both the first branch duct and the second branch duct, and the high temperature gas supplying duct further includes a second main duct communicating with the third branch duct, the first main duct and the second main duct being partitioned by a partition plate extending in an axial direction provided at a center of one duct.
8. The apparatus according to claim 7, wherein a pulverized coal burner is connected to an end of the first main path duct away from the decomposing furnace, and an excess air ratio in the pulverized coal burner is less than 1.
9. The apparatus of claim 1, wherein the hot gas supply duct comprises two third branch ducts horizontally disposed and connected to the hot gas inlet, and the third branch ducts are symmetrically distributed at both sides of the decomposition furnace.
10. The apparatus of claim 1, further comprising a flue chamber located below the decomposition furnace in communication with the bottom of the decomposition furnace.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921220983.4U CN210399972U (en) | 2019-07-31 | 2019-07-31 | High-efficient gasification low-nitrogen combustion technology device of cement dore furnace buggy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921220983.4U CN210399972U (en) | 2019-07-31 | 2019-07-31 | High-efficient gasification low-nitrogen combustion technology device of cement dore furnace buggy |
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| CN210399972U true CN210399972U (en) | 2020-04-24 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110360843A (en) * | 2019-07-31 | 2019-10-22 | 中国科学院力学研究所 | A kind of cement decomposing furnace coal dust high-efficiency gasification low-NO_x combustion technology device |
| CN110360843B (en) * | 2019-07-31 | 2024-10-22 | 中国科学院力学研究所 | High-efficient gasification low nitrogen combustion technology device of cement decomposing furnace buggy |
-
2019
- 2019-07-31 CN CN201921220983.4U patent/CN210399972U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110360843A (en) * | 2019-07-31 | 2019-10-22 | 中国科学院力学研究所 | A kind of cement decomposing furnace coal dust high-efficiency gasification low-NO_x combustion technology device |
| CN110360843B (en) * | 2019-07-31 | 2024-10-22 | 中国科学院力学研究所 | High-efficient gasification low nitrogen combustion technology device of cement decomposing furnace buggy |
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| AV01 | Patent right actively abandoned |
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