CN111551043A - Combustion system of gaseous suspension roasting furnace - Google Patents
Combustion system of gaseous suspension roasting furnace Download PDFInfo
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- CN111551043A CN111551043A CN202010535012.XA CN202010535012A CN111551043A CN 111551043 A CN111551043 A CN 111551043A CN 202010535012 A CN202010535012 A CN 202010535012A CN 111551043 A CN111551043 A CN 111551043A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 77
- 239000000725 suspension Substances 0.000 title claims abstract description 55
- 239000007789 gas Substances 0.000 claims abstract description 56
- 239000003546 flue gas Substances 0.000 claims abstract description 54
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 25
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 239000007787 solid Substances 0.000 claims description 15
- 239000000779 smoke Substances 0.000 claims description 11
- 239000000428 dust Substances 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 42
- 239000001301 oxygen Substances 0.000 abstract description 9
- 229910052760 oxygen Inorganic materials 0.000 abstract description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 8
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000002737 fuel gas Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000009856 non-ferrous metallurgy Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- -1 metallurgy Substances 0.000 description 1
- 238000002156 mixing Methods 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
- 239000002245 particle Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
Abstract
The invention discloses a combustion system of a gaseous suspension roaster, which comprises a main furnace, a gas-fired boiler and a gas-fired boiler, wherein the main furnace is used for generating high-temperature flue gas to roast materials; a blanking pipe for conveying materials into the main furnace; a combustion-supporting air duct for conveying combustion-supporting air into the main furnace; a gas pipeline for delivering gas into the main furnace; the burner is used for igniting gas in the main furnace and is arranged at the delivery port of the gas pipeline; a main flue for discharging flue gas generated by the main furnace; and the recycling flue is used for conveying part of flue gas generated by the main furnace into the main furnace. According to the gas suspension roasting furnace combustion system, under the condition that the technological characteristics of the gas suspension roasting furnace are not influenced, part of flue gas is conveyed into the main furnace through the recirculation flue to be mixed with combustion-supporting air, and the temperature and the oxygen content of a main combustion area of the gas suspension roasting furnace can be effectively reduced due to the fact that the oxygen content of the flue gas generated after combustion is low, so that the purposes of reducing the generation amount of nitrogen oxides of the gas suspension roasting furnace and reducing the emission of the nitrogen oxides are achieved.
Description
Technical Field
The invention relates to the technical field of flue gas denitration of a gaseous suspension roasting furnace, in particular to a combustion system of the gaseous suspension roasting furnace.
Background
The gaseous suspension roasting furnace is widely applied to various production industries such as building materials, metallurgy, chemical industry, environmental protection and the like, and solid materials are mechanically, physically or chemically treated by using the heat released by external fuel combustion or the heat released by the combustion of the materials.
At present, the combustion air of the gaseous suspension roasting furnace mainly comes from cooling air of a material cooling section. The high-pressure blower sends cold air into a material cooling section to cool alumina materials, the cooled alumina materials are heated to become hot air, the hot air enters the main furnace through a combustion-supporting air pipeline and is combusted with gas sent by a gas pipeline to generate a large amount of flue gas, and the hot flue gas enters the Venturi dryer and the gas-solid separator in sequence under the action of the main exhaust fan and then enters the chimney through the dust remover to be discharged into the atmosphere.
As the main combustion area of the gas in the main furnace is concentrated at the lower part in the main furnace and the combustion-supporting air is also completely sent into the combustion area, the temperature of the combustion area of the gaseous suspension roaster is higher, the generation amount of nitrogen oxides is higher, and further the emission of the nitrogen oxides is more.
Disclosure of Invention
In view of the above, the present invention is directed to a combustion system for a gas suspension roaster, which is used to reduce the amount of nitrogen oxides generated in the gas suspension roaster and reduce the emission of nitrogen oxides.
In order to achieve the purpose, the invention discloses the following technical scheme:
a gaseous suspension roaster combustion system, comprising:
the main furnace is used for burning gas to generate high-temperature flue gas to roast materials;
a blanking pipe for conveying materials into the main furnace;
a combustion-supporting air duct for conveying combustion-supporting air into the main furnace;
the gas pipeline is used for conveying gas into the main furnace;
the burner is used for igniting gas in the main furnace and is arranged at a delivery port of the gas pipeline;
a main flue for discharging flue gas generated by the main furnace;
and the system also comprises a recirculation flue used for conveying part of flue gas generated by the main furnace into the main furnace.
Preferably, in the combustion system of the gas suspension roasting furnace, the combustion-supporting air duct includes:
a combustion-supporting air main pipeline communicated with a combustion-supporting air inlet at the bottom of the main furnace;
and the grading combustion-supporting air pipeline is communicated with a grading air nozzle at the middle upper part of the main furnace.
Preferably, in the combustion system of the gaseous suspension roaster, the staged combustion-supporting air duct is provided with a staged combustion-supporting air adjusting damper, and the staged combustion-supporting air adjusting damper is used for adjusting the air volume of the staged combustion-supporting air so as to control the distribution ratio of the combustion-supporting air of the staged combustion-supporting air duct to the combustion-supporting air of the combustion-supporting air main duct.
Preferably, in the combustion system of the gaseous suspension roaster, at least two staged air nozzles are arranged along the circumferential direction of the main furnace, and the staged combustion-supporting air pipeline is connected with the staged air nozzles in a one-to-one correspondence manner through at least two staged air branch pipes.
Preferably, in the combustion system of the gas suspension roaster, a main exhaust fan is arranged at one end of the main flue close to the chimney;
the smoke inlet of the recirculation flue is communicated with the inlet or the outlet of the main exhaust fan, and the smoke outlet of the recirculation flue is communicated with the main combustion air pipeline.
Preferably, in the combustion system of the gas suspension roaster, the flue gas discharged from the main furnace flows through the main flue under the action of the main exhaust fan, sequentially enters the first gas-solid separator, the second gas-solid separator, the venturi dryer and the third gas-solid separator, and then enters the chimney through the dust remover to be discharged into the atmosphere.
Preferably, in the combustion system of the gas suspension roaster, the recirculation flue is provided with a flue gas recirculation fan.
Preferably, in the combustion system of the gas suspension roaster, an inlet side of the flue gas recirculation fan is provided with a recirculation fan inlet damper, and an outlet side of the flue gas recirculation fan is provided with a recirculation fan outlet damper.
Preferably, in the combustion system of the gas suspension roaster, the burners include at least two cyclone burners arranged along the circumferential direction of the main furnace, and the gas pipes are arranged in one-to-one correspondence with the cyclone burners through at least two gas branch pipes.
Preferably, in the combustion system of the gaseous suspension roasting furnace, the main furnace is provided with at least two feed openings, and the feed pipes are correspondingly connected with the feed openings one by one through at least two feed branch pipes.
According to the technical scheme, the combustion system of the gaseous suspension roaster disclosed by the invention comprises a main furnace, a gas burner and a gas burner, wherein the main furnace is used for burning gas to generate high-temperature flue gas to roast materials; a blanking pipe for conveying materials into the main furnace; a combustion-supporting air duct for conveying combustion-supporting air into the main furnace; a gas pipeline for delivering gas into the main furnace; the burner is used for igniting gas in the main furnace and is arranged at the delivery port of the gas pipeline; a main flue for discharging flue gas generated by the main furnace; and the recycling flue is used for conveying part of flue gas generated by the main furnace into the main furnace.
When the combustion system of the gaseous suspension roaster is applied, firstly, materials are conveyed into the main furnace through the blanking pipe; then, delivering combustion-supporting air into the main furnace through a combustion-supporting air pipeline, and delivering fuel gas into the main furnace through a fuel gas pipeline; igniting gas in the main furnace through a burner, and roasting the materials by using heat generated by gas combustion; flue gas generated by combustion in the main furnace is discharged from the main flue; meanwhile, under the condition that the technological characteristics of the gaseous suspension roasting furnace are not influenced, part of flue gas is conveyed into the main furnace through the recirculation flue to be mixed with combustion-supporting air, and the temperature and the oxygen content of a main combustion area of the gaseous suspension roasting furnace can be effectively reduced due to the fact that the oxygen content of the flue gas generated after combustion is low, so that the aims of reducing the generation amount of nitrogen oxides of the gaseous suspension roasting furnace and reducing the emission of the nitrogen oxides are achieved.
In addition, the combustion system of the gaseous suspension roaster disclosed by the invention adopts an intermediate process denitration measure, so that NO in the flue gas of the roaster can be effectively reduced under the condition of not using any reducing agentXThe concentration can effectively reduce the running cost of other denitration modes at the tail of the roasting furnace, and is particularly suitable for the low-nitrogen combustion field of the gaseous suspension roasting furnace in the industries of alumina processing, nonferrous metallurgy and the like.
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 introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a combustion system of a gaseous suspension roaster according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a combustion system of a gaseous suspension roaster, which can reduce the generation amount of nitrogen oxides of the gaseous suspension roaster and reduce the emission of the nitrogen oxides.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
Referring to fig. 1, a combustion system of a gas suspension roaster disclosed in the embodiment of the present invention includes a main furnace 1 for burning gas to generate high temperature flue gas to roast materials; a blanking pipe for conveying the material into the main furnace 1; a combustion-supporting air duct for conveying combustion-supporting air into the main furnace 1; a gas pipe 101 for supplying gas into the main furnace 1; a burner for igniting the gas in the main furnace 1, the burner being arranged at the delivery port of the gas pipeline 101; a main flue 105 for discharging flue gas generated by the main furnace 1; for conveying part of the flue gases produced by the main furnace 1 to a recirculation flue 104 in the main furnace 1.
When the combustion system of the gaseous suspension roaster is applied, firstly, materials are conveyed into the main furnace 1 through the blanking pipe; then, combustion-supporting air is conveyed into the main furnace 1 through a combustion-supporting air pipeline, and fuel gas is conveyed into the main furnace 1 through a fuel gas pipeline 101; igniting gas in the main furnace 1 through a burner, and roasting the materials by using heat generated by gas combustion; flue gas generated by combustion in the main furnace 1 is discharged from the main flue 105; meanwhile, under the condition that the technological characteristics of the gaseous suspension roasting furnace are not influenced, part of flue gas is conveyed into the main furnace 1 through the recirculation flue 104 to be mixed with combustion-supporting air, and the temperature and the oxygen content of a main combustion area of the gaseous suspension roasting furnace can be effectively reduced due to the fact that the oxygen content of the flue gas generated after combustion is low, so that the purposes of reducing the generation amount of nitrogen oxides of the gaseous suspension roasting furnace and reducing the emission of the nitrogen oxides are achieved.
In addition, the combustion system of the gaseous suspension roaster disclosed by the invention adopts an intermediate process denitration measure, so that NO in the flue gas of the roaster can be effectively reduced under the condition of not using any reducing agentXThe concentration can effectively reduce the running cost of other denitration modes at the tail of the roasting furnace, and is particularly suitable for the low-nitrogen combustion field of the gaseous suspension roasting furnace in the industries of alumina processing, nonferrous metallurgy and the like.
Preferably, the combustion-supporting air pipeline comprises a combustion-supporting air main pipeline 102 communicated with a combustion-supporting air inlet at the bottom of the main furnace 1; and a staged combustion-supporting air duct 103 which is communicated with a staged air nozzle 5 at the middle upper part of the main furnace 1. According to the invention, the characteristic of high oxygen content of flue gas of the gaseous suspension roasting furnace is fully considered, on the premise of ensuring normal operation of the gaseous suspension roasting furnace, air classification is adopted, combustion-supporting air is fed into the main furnace 1 from different areas in batches, the combustion-supporting air is fed from the bottom of the main furnace 1 through the main combustion-supporting air pipeline 102, and the combustion-supporting air is fed from the classification air nozzle 5 at the middle upper part of the main furnace 1 through the classification combustion-supporting air pipeline 103, so that the combustion-supporting air quantity of the main combustion area is reduced, the excessive air coefficient of combustion in the main combustion area is reduced, the oxygen content of the main combustion area can be reduced, the temperature of the main combustion area is reduced, and the generation amount.
In addition, combustion-supporting air which is sprayed into the main furnace 1 from the grading air nozzles 5 at the middle upper part of the main furnace 1 after air grading is used as over-fire air, so that air flow can be disturbed strongly, fuel is guaranteed to be combusted fully, the retention time of material particles is prolonged, and the material roasting quality is guaranteed.
In a further technical scheme, a staged combustion-supporting air adjusting air door 4 is arranged on the staged combustion-supporting air pipeline 103, and the staged combustion-supporting air adjusting air door 4 is used for adjusting the air volume of the staged combustion-supporting air so as to control the distribution ratio of the combustion-supporting air of the staged combustion-supporting air pipeline 103 to the combustion-supporting air of the combustion-supporting air main pipeline 102.
The invention can adjust the air quantity of the staged combustion-supporting air fed from the staged air nozzles 5 at the middle upper part of the main furnace 1 through the staged combustion-supporting air adjusting damper 4, can accurately control the distribution proportion of the combustion-supporting air of the staged combustion-supporting air pipeline 103 and the combustion-supporting air of the combustion-supporting air main pipeline 102, and can realize the purpose of reducing the generation quantity of nitrogen oxides generated by combustion to the maximum extent while meeting the combustion requirement.
The number of the grading air nozzles 5 is at least two, the grading air nozzles are arranged along the circumferential direction of the main furnace 1, and the grading combustion-supporting air pipelines 103 are correspondingly connected with the grading air nozzles 5 one by one through at least two grading air branch pipes. The staged combustion air duct 103 delivers combustion air to the staged air nozzles 5 one by one through at least two staged air branch ducts. As shown in fig. 1, two staged air nozzles 5 are arranged in the middle upper region of the main furnace 1, the number of the staged air nozzles 5 is not limited to 2, and may be other numbers, the specific number may be adjusted according to the requirement, and the staged air nozzles 5 are uniformly arranged around the main furnace 1.
A main exhaust fan 7 is arranged at one end of the main flue 105 close to the chimney; the smoke inlet of the recirculation flue 104 is communicated with the inlet or the outlet of the main exhaust fan 7, and the smoke outlet of the recirculation flue 104 is communicated with the main combustion air duct 102.
The recirculated flue gas can be drawn either at the outlet of the main blower 7 or at the inlet of the main blower 7. Specifically, the smoke inlet of the recirculation flue 104 is communicated with the outlet of the main exhaust fan 7, in this embodiment, the recirculation flue 104 and the flue section of the main flue 105 on the outlet side of the main exhaust fan 7 are arranged in parallel, the smoke of the main flue 105 can enter the recirculation flue 104 by using the power of the main exhaust fan 7 and the pressure of the main combustion air duct 102, and then flows into the main combustion air duct 102 to be mixed with the combustion air and then is sent to the main furnace 1, so that the mixing uniformity of the smoke and the combustion air can be improved. Of course, the outlet of the recirculation flue 104 can also be connected separately to the recirculation flue gas inlet of the main furnace 1.
In the combustion system of the gaseous suspension roaster disclosed by the invention, flue gas discharged by a main furnace 1 flows through a main flue 105 under the action of a main exhaust fan 7, sequentially enters a first gas-solid separator 2, a second gas-solid separator 11, a venturi dryer 12 and a third gas-solid separator 13, and then enters a chimney through a dust remover to be discharged into the atmosphere. The invention utilizes the first gas-solid separator 2, the second gas-solid separator 11, the venturi drier 12, the third gas-solid separator 13 and the dust remover to carry out gas-solid separation, drying, dust removal and temperature reduction on the flue gas, thereby realizing the purpose of meeting the emission requirement of the flue gas.
After being extracted, part of the low-temperature and low-oxygen flue gas treated by the devices is connected into the main combustion air pipeline 102 through the recirculation flue 104, mixed and then sent into the main furnace 1. The recirculated flue gas is obtained from the cleaned flue gas after dust removal, SO2And the content of smoke dust is low, so that the influence of impurities in the smoke gas on the quality of a target product of the material, such as an alumina product, can be avoided.
It can be understood that the invention can also extract part of the flue gas in the flue among the above parts, and send the flue gas into the main furnace 1 after carrying out corresponding treatment such as temperature reduction and dust removal.
To further promote the flow of recirculated flue gas, a flue gas recirculation fan 8 is provided on the recirculation flue 104. The flue gas recirculation fan 8 can be additionally arranged according to the position of the extraction opening of the recirculation flue gas in the main flue 105 and the pressure of a combustion-supporting air interface of the recirculation flue 104 and the combustion-supporting air main pipeline 102.
In order to further optimize the above technical solution, the inlet side of the flue gas recirculation fan 8 is provided with a recirculation fan inlet damper 9, and the outlet side is provided with a recirculation fan outlet damper 10.
In the embodiment, the amount of the recirculated flue gas mixed into the combustion-supporting air is adjusted by the recirculation fan inlet damper 9 and the recirculation fan outlet damper 10 on the flue gas recirculation fan 8 and the recirculation flue 104, so that the adjustment precision of the amount of the recirculated flue gas can be improved, the combustion state in the main furnace 1 can be conveniently adjusted, and the generation amount of nitrogen oxides in the gas suspension roaster can be reduced to the greatest extent.
The combustor includes two at least cyclone burner 3, arranges along the circumference of main furnace 1, and gas pipeline 101 sets up through two at least gas branch pipes and cyclone burner 3 one-to-one. The invention adopts the spiral-flow type burner 3 to ignite the fuel gas in the main furnace 1, the burners are dispersedly arranged along the circumferential direction of the main furnace 1, the flame combustion temperature is reduced by adopting the dispersive combustion technology, and the nozzle of the spiral-flow type burner 3 is sprayed out to the circumferential direction of the main furnace 1, so that the fuel gas spiral flow can be formed, the flame can cover the whole combustion section of the main furnace 1 as far as possible, the local high temperature is avoided, and the NO is reducedXThe amount of production.
The number of the cyclone burners 3 is specifically 2, but not only limited to 2, but the specific number can be adjusted according to the requirement and is arranged on the main furnace 1 in a surrounding manner.
The main furnace 1 is provided with at least two feed openings 6, and the feed pipes are correspondingly connected with the feed openings 6 one by one through at least two feed branch pipes. Specifically, a plurality of feed openings 6 are distributed along the axial direction of the main furnace 1. The invention adopts multi-point feeding, changes the single-point feeding of the feeding pipe of the second gas-solid separator 11 into the main furnace 1 into two-point or multi-point feeding, installs the feeding opening 6 at the feeding point, the number of the feeding openings 6 is not limited to 2, and a plurality of feeding openings 6 can be added according to the requirement.
By multipoint feedingCan improve the uniformity of the material entering the main furnace 1, ensure that the material can be fully contacted with the heat generated by combustion, increase the reaction time of the material, reduce the local overheating phenomenon and further reduce the roasting temperature and NOXThe yield, the heat consumption is reduced, and the roasting efficiency is improved.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention 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.
Claims (10)
1. A gaseous suspension roaster combustion system, comprising:
a main furnace (1) for burning gas to generate high temperature flue gas to roast materials;
a blanking pipe for conveying materials into the main furnace (1);
a combustion-supporting air duct for conveying combustion-supporting air into the main furnace (1);
a gas pipeline (101) for conveying gas into the main furnace (1);
a burner for igniting the gas in the main furnace (1), said burner being arranged at the delivery opening of the gas duct (101);
a main flue (105) for discharging flue gases produced by the main furnace (1);
characterized in that it also comprises a recirculation flue (104) for conveying part of the flue gases produced by the main furnace (1) into the main furnace (1).
2. The gaseous suspension roasting furnace combustion system of claim 1, wherein the combustion air duct comprises:
a combustion-supporting air main pipe (102) communicated with a combustion-supporting air inlet at the bottom of the main furnace (1);
and the grading combustion-supporting air pipeline (103) is communicated with a grading air nozzle (5) at the middle upper part of the main furnace (1).
3. The combustion system of a gaseous suspension roasting furnace according to claim 2, wherein a staged combustion-supporting air damper (4) is disposed on the staged combustion-supporting air duct (103), and the staged combustion-supporting air damper (4) is used for adjusting the air volume of staged combustion-supporting air to control the distribution ratio of the combustion-supporting air of the staged combustion-supporting air duct (103) to the combustion-supporting air of the combustion-supporting air main duct (102).
4. A gaseous suspension roasting furnace combustion system according to claim 2, characterized in that the number of classifying air nozzles (5) is at least two, arranged along the circumference of the main furnace (1), and the classifying combustion air duct (103) is connected with the classifying air nozzles (5) in a one-to-one correspondence by at least two classifying air branch pipes.
5. A gaseous suspension roasting furnace combustion system according to claim 1 wherein the main flue (105) is provided with a main draft fan (7) at an end adjacent to the chimney;
the smoke inlet of the recirculation flue (104) is communicated with the inlet or the outlet of the main exhaust fan (7), and the smoke outlet of the recirculation flue (104) is communicated with the main combustion air pipeline (102).
6. The combustion system of a gas suspension roasting furnace according to claim 5, wherein flue gas discharged from the main furnace (1) flows through the main flue (105) under the action of the main exhaust fan (7), and enters the first gas-solid separator (2), the second gas-solid separator (11), the venturi dryer (12) and the third gas-solid separator (13) in sequence, and then enters the chimney through the dust remover to be discharged into the atmosphere.
7. A combustion system of a gaseous suspension roasting furnace according to claim 5, characterized in that the recirculation flue (104) is provided with a flue gas recirculation fan (8).
8. A combustion system of a gas suspension roaster according to claim 7, wherein the inlet side of the flue gas recirculation fan (8) is provided with a recirculation fan inlet damper (9) and the outlet side is provided with a recirculation fan outlet damper (10).
9. A gaseous suspension roasting furnace combustion system according to claim 1, wherein the burners comprise at least two cyclone burners (3) arranged in the circumferential direction of the main furnace (1), and the gas pipes (101) are arranged in one-to-one correspondence with the cyclone burners (3) by means of at least two gas branch pipes.
10. A combustion system of a gaseous suspension roasting furnace according to claim 1, characterized in that the main furnace (1) is provided with at least two feed openings (6), and the feed pipes are connected with the feed openings (6) in a one-to-one correspondence by means of at least two feed branch pipes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535012.XA CN111551043A (en) | 2020-06-12 | 2020-06-12 | Combustion system of gaseous suspension roasting furnace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010535012.XA CN111551043A (en) | 2020-06-12 | 2020-06-12 | Combustion system of gaseous suspension roasting furnace |
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| Publication Number | Publication Date |
|---|---|
| CN111551043A true CN111551043A (en) | 2020-08-18 |
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|---|---|---|---|
| CN202010535012.XA Pending CN111551043A (en) | 2020-06-12 | 2020-06-12 | Combustion system of gaseous suspension roasting furnace |
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2020
- 2020-06-12 CN CN202010535012.XA patent/CN111551043A/en active Pending
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