CN211977552U - Coal powder oxygen-enriched burner of rotary cement kiln - Google Patents
Coal powder oxygen-enriched burner of rotary cement kiln Download PDFInfo
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- CN211977552U CN211977552U CN202020692616.0U CN202020692616U CN211977552U CN 211977552 U CN211977552 U CN 211977552U CN 202020692616 U CN202020692616 U CN 202020692616U CN 211977552 U CN211977552 U CN 211977552U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a rotary cement kiln pulverized coal oxygen-enriched burner, which is a sleeve type burner and comprises a central ignition channel, a rotational flow air channel, an inner axial flow air channel, a pulverized coal air channel, an outer axial flow air channel and a cooling air channel; the central ignition channel is arranged in the center of the burner, the rotational flow air channel is arranged between the central ignition channel and the inner axial flow air channel, the inner axial flow air channel is arranged on the outer ring of the rotational flow air channel, the pulverized coal air channel is arranged on the outer ring of the inner axial flow air channel, the outer axial flow air channel is arranged on the outer ring of the pulverized coal air channel, and the cooling air channel is arranged on the outer ring of the outer axial flow air channel. The coal dust air channel is preferably a zigzag channel. The utility model has the advantages of compact structure, easy operation, stable burning, high combustion efficiency, etc.
Description
Technical Field
The utility model relates to a combustor technical field, concretely relates to rotary cement kiln buggy oxygen boosting combustor.
Background
Along with the general glide-down situation of the investment acceleration of domestic fixed assets, the domestic cement productivity is excessive and obvious, and under the background of reform at the supply side and capacity removal, the newly added cement production line is reduced year by year. The development of a novel dry cement process technology, a novel low-carbon cement production technology, an advanced energy-saving and emission-reducing technology for cement production and a complete set of technology and equipment for cement kiln cooperative treatment is a great trend for the development of the cement industry.
The proportion of coal used by a rotary kiln head coal powder burner in a cement production line is 30-50%, the fuel cost is one of main costs of cement clinker, on the premise of ensuring the cement yield and not increasing the extra production cost of a cement plant, the coal used by the rotary kiln can be reduced through a reasonable combustion organization, the energy consumption of the cement plant can be greatly reduced, and the rotary kiln coal powder burner is the most critical equipment for organizing coal powder combustion, so the performance of the rotary kiln coal powder burner is an important basis for considering the rotary kiln combustion.
At present, most of rotary kiln pulverized coal burners are applied in a three-channel or four-channel arrangement mode. The main factors influencing the performance of the pulverized coal burner are primary air proportion, pulverized coal speed, outlet air speed of each channel, rotational flow strength and the like. The common rotary kiln coal powder burner can not adapt to the change of combustion characteristics caused by the change of coal types generally, the method for improving the cement yield is increased by increasing the flow of the coal powder generally, and the rotary kiln coal powder burner is not economical and is easy to cause the non-uniformity of a temperature field and the change of the quality of cement clinker.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a rotary cement kiln buggy oxygen boosting combustor to solve the not enough of prior art.
The utility model adopts the following technical scheme:
a kind of cement rotary kiln coal dust oxygen-enriched burner, the said burner is a sleeve burner, including central ignition channel, swirling flow wind channel, inner axial flow wind channel, coal dust wind channel, outer axial flow wind channel, cooling air channel;
the central ignition channel is arranged in the center of the burner, the rotational flow air channel is arranged between the central ignition channel and the inner axial flow air channel, the inner axial flow air channel is arranged on the outer ring of the rotational flow air channel, the pulverized coal air channel is arranged on the outer ring of the inner axial flow air channel, the outer axial flow air channel is arranged on the outer ring of the pulverized coal air channel, and the cooling air channel is arranged on the outer ring of the outer axial flow air channel.
Further, the pulverized coal air channel is a zigzag channel.
Furthermore, the pulverized coal air channel comprises an inner layer and an outer layer, a plurality of axial sawteeth are uniformly arranged on the outer wall of the inner layer, a plurality of axial sawteeth are uniformly arranged on the inner wall of the outer layer in a matched mode, and during installation, the axial sawteeth of the outer wall of the inner layer and the axial sawteeth of the inner wall of the outer layer are staggered to form a sawteeth channel.
Furthermore, a plurality of convex blocks are arranged on the outer wall of the inner layer and used for positioning and supporting when the inner layer and the outer layer are installed.
Furthermore, the initial angle of the cyclone air channel is set to be 45 degrees, and the cyclone angle can be adjusted according to different coal types and the change of the load of the rotary kiln.
Further, the outlets of the inner axial flow air channel are circular hole-shaped, and the number of the circular hole-shaped outlets is 4-48.
Furthermore, the outlets of the outer axial flow air channel are circular hole-shaped, and the number of the circular hole-shaped outlets is 4-48.
Further, the cooling air channel is an arc annular gap-shaped channel.
The utility model has the advantages that:
1. the utility model discloses rotary cement kiln pulverized coal burner is telescopic combustor, including central ignition passageway, whirl wind passageway, interior axial flow wind passageway, buggy wind passageway, outer axial flow wind passageway, cooling air passageway, have advantages such as compact structure, easy operation, stable, the combustion efficiency height of burning.
2. The utility model designs a two axial-flow wind passageway, interior axial-flow wind passageway and outer axial-flow wind passageway arrange the inner ring and the outer loop of buggy wind passageway in respectively. The inner axial flow air channel mainly has the functions of providing oxygen required by the initial combustion of the pulverized coal, increasing the amount of oxygen mixed with the pulverized coal air, maintaining the rigidity of flame to a certain degree and also maintaining the stability of the flame. The outer axial flow air channel mainly provides oxygen for the initial stage of pulverized coal combustion, and pulverized coal can be wrapped from the outer side, so that pulverized coal air can continuously maintain the jet flow direction to move forward to complete combustion after entering the rotary kiln, and flame is prevented from spreading outwards. And the design of the double-axial-flow air channel can reduce the scouring of the burner head of the backflow area and reduce the abrasion of the burner head. Through reasonable design of the flow of the inner axial flow wind, the inner axial flow wind promotes the mixing of the inner axial flow wind and the pulverized coal wind under the entrainment effect of the rotational flow wind, and the pulverized coal combustion efficiency is improved.
3. The utility model discloses buggy wind passageway is the zigzag passageway, compare with traditional cement kiln stove pulverized coal burner annular pulverized coal wind passageway, the zigzag passageway can increase buggy wind turbulence degree, and increased the passageway girth under the equal flow area condition, the area of contact of buggy with other passageway oxygen has been increased in other words, when buggy wind is through the zigzag ring, do benefit to the oxygen in buggy and other passageways and can better mix, strengthen the combustion strength and the burnout degree of buggy, realize the high-efficient burning of buggy.
Drawings
FIG. 1 is a sectional view of the main structure of a pulverized coal oxygen-enriched burner of a rotary cement kiln.
FIG. 2 is an axial schematic view of a pulverized coal oxygen-enriched burner head of a rotary cement kiln.
FIG. 3 is a schematic structural diagram of a head of a pulverized coal oxygen-enriched burner of a rotary cement kiln.
Fig. 4 is a schematic structural diagram of an inner layer of a pulverized coal air channel.
Fig. 5 is a schematic structural diagram of the outer layer of the pulverized coal air channel.
The device comprises a central ignition channel 1, a rotational flow air channel 2, an inner axial flow air channel 3, a pulverized coal air channel 4, an outer axial flow air channel 5 and a cooling air channel 6.
Detailed Description
The invention is further explained below with reference to examples and figures. The following examples are provided only for illustrating the present invention and are not intended to limit the scope of the present invention.
A rotary cement kiln pulverized coal oxygen-enriched combustor is shown in figures 1-3 and is a sleeve type combustor and comprises a central ignition channel 1, a rotational flow air channel 2, an inner axial flow air channel 3, a pulverized coal air channel 4, an outer axial flow air channel 5 and a cooling air channel 6.
The central ignition channel 1 is arranged in the center of the burner and is used for ignition when the rotary kiln is started.
The rotational flow air channel 2 is arranged between the central ignition channel 1 and the inner axial flow air channel 3. The cyclone air channel 2 is mainly used for sucking high-temperature secondary air in the rotary kiln, and the shape of flame expansion can be controlled according to different angles of the cyclone. The cyclone body plays a certain supporting role, the initial angle of the cyclone can be set to be 45 degrees, and the cyclone angle can be properly adjusted according to different coal types and the change of the load of the rotary kiln so as to meet the optimal cyclone entrainment strength.
The inner axial flow air channel 3 is arranged on the outer ring of the rotational flow air channel 2, the outlet of the inner axial flow air channel 3 is in a circular hole shape, and the number of the outlets in the circular hole shape is generally 4-48. The inner axial flow air channel 3 mainly has the functions of providing oxygen required by the initial combustion of the pulverized coal, increasing the oxygen mixed with the pulverized coal air, maintaining the rigidity of flame to a certain degree and also maintaining the stability of the flame.
The pulverized coal air channel 4 is arranged at the outer ring of the inner axial flow air channel 3. Preferably, the pulverized coal air passage 4 is a zigzag passage. The zigzag channel can be realized by the following structure: as shown in fig. 4 and 5, the pulverized coal air passage 4 comprises an inner layer and an outer layer, a plurality of axial sawteeth are uniformly arranged on the outer wall of the inner layer, a plurality of axial sawteeth are uniformly arranged on the inner wall of the outer layer in a matched manner, and during installation, the axial sawteeth of the outer wall of the inner layer and the axial sawteeth of the inner wall of the outer layer are staggered to form a sawteeth passage. Compared with the annular pulverized coal air channel of the conventional cement kiln pulverized coal burner, the zigzag channel can increase the turbulence degree of pulverized coal air, the perimeter of the channel is increased under the condition of the same flow area, which is equivalent to increase the contact area of pulverized coal and oxygen of other channels, and when pulverized coal air passes through the zigzag ring, the pulverized coal burner is beneficial to better mixing of the pulverized coal and oxygen in other channels, so that the efficient combustion of the pulverized coal is realized. Preferably, a plurality of projections are arranged on the outer wall of the inner layer and used for positioning and supporting when the inner layer and the outer layer are installed.
The outer axial flow air channel 5 is arranged on the outer ring of the pulverized coal air channel 4, the outlet of the outer axial flow air channel 5 is in a circular hole shape, and the number of the outlets in the circular hole shape is generally 4-48. The outer axial flow air channel 5 mainly provides oxygen for the initial stage of pulverized coal combustion, and can wrap pulverized coal from the outer side, so that pulverized coal air can continuously maintain the jet flow direction to move forward to complete combustion after entering the rotary kiln, and flame is prevented from spreading outwards.
The cooling air channel 6 is arranged at the outer ring of the outer axial flow air channel 5 and is an arc annular gap-shaped channel. The cooling air channel 6 prevents the head part of the burner from being over-heated, and ensures the safe and stable operation of the burner.
The central ignition channel 1, the rotational flow air channel 2, the inner axial flow air channel 3, the pulverized coal air channel 4 and the outer axial flow air channel 5 can be made of stainless steel or ceramic, and the cooling air channel 6 can be made of stainless steel. When the pulverized coal air passage 4 is made of stainless steel, the rear ends of the axial sawteeth on the inner outer wall of the pulverized coal air passage 4 and the rear ends of the axial sawteeth on the outer inner wall are respectively provided with matched ceramic sawteeth so as to reduce the abrasion to the pulverized coal air passage 4.
Oxygen boosting burning can improve the combustion strength and the burnout degree of buggy, but oxygen boosting burning needs the cooperation of different passageway cloth wind just can exert oxygen boosting burning's effect, the utility model discloses oxygen boosting combustor whirl wind passageway 2, interior axial flow wind passageway 3, buggy wind passageway 4, outer axial flow wind passageway 5 all can adopt the oxygen boosting air supply (used oxygen boosting temperature of each passageway, pressure are different, because of not relating to the utility model discloses the oxygen boosting combustor structure, the utility model discloses it is not specifically limited here), the oxygen boosting proportion is generally between 25% ~ 50%, according to nimble regulation such as the coal kind, rotary kiln operation operating condition. The oxygen-enriched combustion is adopted to reduce the amount of nitrogen put into the kiln and reduce thermal NOx generated by nitrogen and oxygen at high temperature, thereby achieving the purpose of reducing the concentration of NOx in the flue gas. The source treatment of NOx emission is realized, a large amount of environmental protection investment is saved, and secondary pollution and pollution in the preparation process of denitration chemical materials are avoided.
Claims (8)
1. A kind of cement rotary kiln coal dust oxygen enrichment burner, characterized by, the said burner is a sleeve burner, including central ignition channel, swirling flow wind channel, inner axial flow wind channel, coal dust wind channel, outer axial flow wind channel, cooling air channel;
the central ignition channel is arranged in the center of the burner, the rotational flow air channel is arranged between the central ignition channel and the inner axial flow air channel, the inner axial flow air channel is arranged on the outer ring of the rotational flow air channel, the pulverized coal air channel is arranged on the outer ring of the inner axial flow air channel, the outer axial flow air channel is arranged on the outer ring of the pulverized coal air channel, and the cooling air channel is arranged on the outer ring of the outer axial flow air channel.
2. The rotary cement kiln pulverized coal oxygen-enriched burner as claimed in claim 1, wherein the pulverized coal air passage is a zigzag passage.
3. The rotary cement kiln pulverized coal oxygen-enriched burner as claimed in claim 2, wherein the pulverized coal air passage comprises an inner layer and an outer layer, a plurality of axial serrations are uniformly provided on an outer wall of the inner layer, a plurality of axial serrations are uniformly provided on an inner wall of the outer layer, and when the burner is installed, the axial serrations of the outer wall of the inner layer and the axial serrations of the inner wall of the outer layer are staggered to form a serration passage.
4. The rotary cement kiln pulverized coal oxygen-enriched burner as claimed in claim 3, wherein a plurality of projections are arranged on the outer wall of the inner layer for positioning and supporting when the inner layer and the outer layer are installed.
5. The rotary cement kiln pulverized coal oxygen-enriched burner as claimed in any one of claims 1 to 4, wherein the initial angle of the cyclone air channel is set to 45 degrees, and the cyclone angle can be adjusted according to the change of different coal types and rotary kiln loads.
6. The rotary cement kiln pulverized coal oxygen-enriched combustor as claimed in any one of claims 1-4, wherein the outlets of the inner axial flow air channel are circular holes, and the number of the circular hole outlets is 4-48.
7. The rotary cement kiln pulverized coal oxygen-enriched combustor as claimed in any one of claims 1-4, wherein the outlet of the outer axial flow air channel is in a circular hole shape, and the number of the circular hole-shaped outlets is 4-48.
8. The rotary cement kiln pulverized coal oxycombustion burner as claimed in any one of claims 1 to 4, wherein the cooling air passage is an arc annular gap-shaped passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020692616.0U CN211977552U (en) | 2020-04-29 | 2020-04-29 | Coal powder oxygen-enriched burner of rotary cement kiln |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020692616.0U CN211977552U (en) | 2020-04-29 | 2020-04-29 | Coal powder oxygen-enriched burner of rotary cement kiln |
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| CN211977552U true CN211977552U (en) | 2020-11-20 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484025A (en) * | 2020-12-04 | 2021-03-12 | 鞍钢集团矿业有限公司 | Three-channel pulverized coal burner and rotary kiln with same |
| CN113464933A (en) * | 2021-07-02 | 2021-10-01 | 合肥水泥研究设计院有限公司 | Swirler with gradually changed spiral angle |
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2020
- 2020-04-29 CN CN202020692616.0U patent/CN211977552U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112484025A (en) * | 2020-12-04 | 2021-03-12 | 鞍钢集团矿业有限公司 | Three-channel pulverized coal burner and rotary kiln with same |
| CN113464933A (en) * | 2021-07-02 | 2021-10-01 | 合肥水泥研究设计院有限公司 | Swirler with gradually changed spiral angle |
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