CN213840917U - Multichannel air distribution adjusting rotary kiln humidifying low-nitrogen combustor - Google Patents
Multichannel air distribution adjusting rotary kiln humidifying low-nitrogen combustor Download PDFInfo
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- CN213840917U CN213840917U CN202022644380.6U CN202022644380U CN213840917U CN 213840917 U CN213840917 U CN 213840917U CN 202022644380 U CN202022644380 U CN 202022644380U CN 213840917 U CN213840917 U CN 213840917U
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Abstract
The invention provides a multi-channel air distribution adjusting rotary kiln humidifying low-nitrogen burner which comprises an ignition gun channel, a central air channel, an inner air channel, a fuel channel, an outer air channel and a heat insulation layer which are coaxially arranged from inside to outside, wherein an inlet is arranged at the upstream of each channel, the inlets of the channels are sequentially arranged from top to bottom, and an air inlet of the central air channel, an air inlet of the inner air channel and an air inlet of the outer air channel are communicated with an air inlet pipe; a central air adjusting valve is arranged in an air inlet of the central air channel, an inner air adjusting valve is arranged in the air inlet of the inner air channel, an outer air adjusting valve is arranged in the air inlet of the outer air channel, and a humidifying system is further arranged in the air inlet of the inner air channel. The invention has simple structure, convenient operation, wide adjusting range and good combustion stability, can adjust the peak temperature, length and position of flame according to different product process temperature requirements, fundamentally controls the concentration of NOx and reduces the pollution to the environment.
Description
Technical Field
The invention belongs to the technical field of rotary kilns, and particularly relates to a multi-channel air distribution adjusting rotary kiln humidifying low-nitrogen burner.
Background
The rotary kiln is a high energy consumption device in the fields of chemical industry, metallurgical industry and the like. The rotary kiln has a high-temperature flue gas environment, which is very beneficial to the generation of NOx in thermal type (gas fuel), rapid type (gas fuel) and fuel type (pulverized coal fuel), and particularly in the production process of rotary kilns such as alumina, cement, pellets and the like, a plurality of process intervals such as a drying zone, a preheating zone, a decomposition zone, a burning zone, a cooling zone and the like generally exist in the rotary kiln, the process intervals usually result in the length of the rotary kiln being in the order of tens of meters, wherein the burning zone interval with the flue gas temperature higher than 1500 ℃ is also in the order of tens of meters. Therefore, the residence time of the high temperature flue gas in the rotary kiln is sufficient to generate a large amount of NOx.
Although the flue gas denitration device arranged at the downstream of the rotary kiln can reduce the concentration of NOx in the flue gas, the generation of NOx is not effectively inhibited from the source, and the energy consumption and the production cost are increased. Meanwhile, the rotary kiln burner cannot well adjust the peak temperature, length and position of flame under the condition of meeting different production process temperature requirements, so that the yield is reduced, and the production cost is increased.
Disclosure of Invention
In view of the above, the invention aims to provide a multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner which is simple in structure, convenient to operate, wide in adjusting range and good in combustion stability, and can adjust the peak temperature, length and position of flame according to different product process temperature requirements, so that the concentration of NOx is controlled fundamentally, and the pollution to the environment is reduced.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a multi-channel air distribution adjusting rotary kiln humidifying low-nitrogen burner comprises an ignition gun channel, a central air channel, an inner air channel, a fuel channel, an outer air channel and a heat insulation layer which are coaxially arranged from inside to outside, wherein an inlet is formed in the upstream of each channel, the inlets of the channels are sequentially arranged from top to bottom, an air inlet of the central air channel, an air inlet of the inner air channel and an air inlet of the outer air channel are communicated with an air inlet pipe, and the heat insulation layer is arranged at the tail end of the outer air channel;
a central air regulating valve is arranged in an air inlet of the central air channel, an inner air regulating valve is arranged in the air inlet of the inner air channel, an outer air regulating valve is arranged in the air inlet of the outer air channel, a humidifying system is also arranged in the air inlet of the inner air channel, a nozzle of the humidifying system is arranged at the downstream of the inner air regulating valve, and a plurality of drain holes are formed in the lower wall of the inner air channel at the downstream of the humidifying system;
a plurality of central wind channel outlet nozzles are uniformly arranged at the tail end of the central wind channel, the outlet of the inner wind channel is an annular outlet, a plurality of axial swirl vanes are uniformly arranged at the annular outlet, and an expansion section is arranged at the position, close to the outlet, of the annular outlet; and a plurality of fuel channel outlet nozzles are uniformly arranged at the tail end of the fuel channel, and a plurality of outer wind channel outlet nozzles are uniformly arranged at the tail end of the outer wind channel.
Further, 16-20 axial swirl blades are arranged, and the axial swirl blades are uniformly arranged at an inclination angle of 20-25 degrees.
Further, the divergent angle of the divergent section is 15-17 °.
Further, the spray angle of the nozzles of the humidifying system is 30-35 °.
Furthermore, the central air channel outlet nozzle and the outer air channel outlet nozzle are both circular nozzles, and the fuel channel outlet nozzle is a rectangular nozzle.
Furthermore, 16-20 fuel channel outlet nozzles are arranged, 18-20 outer air channel outlet nozzles are arranged, 16-20 central air channel outlet nozzles are arranged, and 5-7 drain holes are arranged.
Further, the humidifying system is a humidifier.
Further, the thickness of the heat insulation layer is 100-150 mm.
Furthermore, the air inlet of the inner air channel and the air inlet of the outer air channel are obliquely arranged.
Further, the ignition gun channel is in threaded connection with the ignition gun.
Compared with the prior art, the multi-channel air distribution adjusting rotary kiln humidifying low-nitrogen combustor has the following advantages:
when the burner is used for actual production, the peak temperature, the length and the position of flame can be changed according to different requirements of product process temperature, the generation amount of NOx is controlled, and the waste gas treatment cost and the pollution to the environment are reduced.
The utility model provides an ignition gun passageway, central wind passageway, interior wind passageway, fuel passageway, outer wind passageway and insulating layer adopt coaxial arrangement mode, still have rational in infrastructure, make the simple advantage of installation. Through the central air channel, the inner air channel and the outer air channel, air is distributed into three paths to enter the combustor, fine grading control of the air in the radial direction is achieved, and the mixing and combustion effects of each path of air are more definite. The heat insulation layer is arranged on the outermost layer of the combustor, and the channel of the ignition gun is arranged in the center of the combustor, so that the ablation damage of the combustor structure by high-temperature smoke can be effectively reduced.
The internal wind and the high-speed fuel jet flow are mixed, so that the fuel generates chemical reaction in the backflow generated under the combined action of the internal wind weak rotation and the high-speed central wind jet flow entrainment.
The speed difference of the external air and the high-temperature secondary air of the rotary kiln can generate a rolling suction effect, so that the high-temperature secondary air moves towards the center of the rotary kiln, the whole energy utilization rate of the rotary kiln is effectively improved, and the fuel cost is reduced.
The utility model provides an outer wind, interior wind and central wind all can adjust the flow alone, increase interior wind flow, dwindle outer wind and central wind flow simultaneously, and wind whirl intensity in the reinforcing can effective control flame peak value temperature, length and position.
The humidification system can further reduce the generation amount of NOx and the flame peak temperature under the condition that the proportion of the external wind, the internal wind and the central wind is fixed. When the humidifying system is arranged in the inner air channel to operate, the generation amount of NOx is greatly reduced.
In this application, the nozzle of humidification system arranges in the leeward of wind governing valve, and this is favorable to the water droplet of tiny granule fully to mix with interior wind, avoids the water droplet to adhere to parts such as valve and produces the corruption.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:
fig. 1 is a schematic structural diagram of a multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner according to the inventive embodiment of the present invention;
FIG. 2 is a schematic end view of a humidifying low-nitrogen burner of a multi-channel air distribution adjusting rotary kiln according to the embodiment of the invention;
FIG. 3 is a schematic partial enlarged end structure of a multi-channel air distribution adjusting rotary kiln humidifying low-nitrogen burner according to the inventive embodiment of the present invention;
fig. 4 is a schematic structural diagram of a drain hole of a multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner according to the inventive embodiment of the invention.
Description of reference numerals:
1-passage of ignition gun; 2-central wind channel; 3-an internal air channel; 4-a fuel channel; 5-an external air channel; 6-a heat insulation layer; 7-central wind channel outlet spout; 8-central wind regulating valve; 9-an annular outlet; 10-axial swirl vanes; 11-an expansion section; 12-inner air regulating valve; 13-fuel channel outlet nozzle; 14-outer wind channel outlet nozzle; 15-external air regulating valve; 16-a nozzle; 17-a drain hole, 18-an air inlet pipe and 19-a humidifying system.
Detailed Description
It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.
As shown in fig. 1-4, a multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner comprises an ignition gun channel 1, a central air channel 2, an inner air channel 3, a fuel channel 4, an outer air channel 5 and a heat insulation layer 6 which are coaxially arranged from inside to outside, wherein an inlet is arranged at the upstream of each channel, the inlets of the channels are sequentially arranged from top to bottom, an air inlet of the central air channel 2, an air inlet of the inner air channel 3 and an air inlet of the outer air channel 5 are communicated with an air inlet pipe 18, and the heat insulation layer 6 is arranged at the tail end of the outer air channel 5;
a central air regulating valve 8 is arranged in an air inlet of the central air channel 2, an inner air regulating valve 12 is arranged in the air inlet of the inner air channel 3, an outer air regulating valve 15 is arranged in the air inlet of the outer air channel 5, a humidifying system 19 is also arranged in the air inlet of the inner air channel 3, a nozzle 16 of the humidifying system 19 is arranged at the downstream of the inner air regulating valve 12, and a plurality of drain holes 17 are formed in the lower wall of the inner air channel 3 at the downstream of the humidifying system 19;
evenly be equipped with a plurality of central wind passageway export spout 7 at central wind passageway 2's end, interior wind passageway 3's export is annular export 9, at annular export 9 evenly installed a plurality of axial whirl blades 10 of department, specifically do: the axial swirl vanes 10 are fixed at the outlet of the tail end of the inner wall of the inner air channel 3, and an expansion section 11 is arranged at the position, close to the outlet, of the annular outlet; and a plurality of fuel channel outlet nozzles 13 are uniformly arranged at the tail end of the fuel channel 4, and a plurality of outer wind channel outlet nozzles 14 are uniformly arranged at the tail end of the outer wind channel 5.
16-20 axial swirl blades 10 are arranged, and the axial swirl blades 10 are uniformly arranged at an inclination angle of 20-25 degrees, so that the wind in the central wind channel can be guided to form swirl, and the full combustion is facilitated.
The divergence angle of the divergent section 11 is 15-17 °. The divergence angle of 15-17 degrees can make the inner wind effectively mixed with the fuel jet. The angle is too large, the internal wind is mixed with the fuel earlier, and the flame is too close to the outlet of the combustor; the angle is too small, and the internal wind is mixed with the fuel later, so that the flame length is prolonged, and the control of NOx is not facilitated.
The spray angle of the nozzle of the humidifying system 19 is 30-35 degrees, which is the optimal angle for preventing the water mist from spraying to the inner wall of the inner air pipeline under the condition of the sufficient mixing distance of the water mist and the inner air.
The central air channel outlet nozzle 7 and the outer air channel outlet nozzle 14 are both circular nozzles; the fuel channel outlet nozzle 13 is a rectangular nozzle.
16-20 fuel channel outlet nozzles 13 are arranged to form high-speed fuel jet flow to accelerate mixing with internal wind; 18-20 outlet nozzles 14 of the external air channel are arranged to form high-speed air jet flow to suck the high-temperature secondary air of the rotary kiln; 16-20 central air channel outlet nozzles 7 are arranged to form high-speed air jet flow, so that a backflow stabilizing area is formed; the number of the drain holes 17 is 5-7, and the drain holes are used for draining the sprayed water vapor of the humidifying system 19.
The humidification system 19 is a humidifier. The heat insulation layer 6 is a castable heat insulation layer with the thickness of 100-150 mm.
The air inlet of the inner air channel 3 and the air inlet of the outer air channel 5 are obliquely arranged, so that the local resistance loss of the channels is reduced, and the energy consumption of the fan is reduced.
The ignition gun channel 1 is in threaded connection with the ignition gun, and the ignition gun is installed, moved and positioned.
The central air regulating valve 8, the inner air regulating valve 12 and the outer air regulating valve 15 are all electric regulating valves, the electric regulating valves are connected with a controller, regulation is carried out according to operation requirements through control of the controller, the controller and the electric regulating valves are all common parts in the field, connection relations and working principles all belong to common knowledge, and details are omitted here.
In this application, the water spray amount of the humidification system 19 should be matched with the flow amount of the internal wind, and the maximum water spray amount of the humidification system should be equal to the minimum value of the adjustable mass flow amount of the internal wind in consideration of the carrying kinetic energy of the internal wind.
The NOx generated by the combustor is mainly thermal NOx, and the thermal NOx generation mechanism, namely a Zellermultidimensional mechanism, is known to be influenced by the temperature of flue gas when gas fuel is input into a fuel channel. When the humidifying system is put into operation, the water content of the internal air is increased, the specific heat is increased, the injection speed is increased, the increase of the rotational flow strength of the internal air is facilitated, the mixing of the internal air and fuel is more uniform, the local high-temperature area of the flue gas is reduced, and the reduction of the generation amount of NOx is realized while the peak temperature of the flue gas is reduced.
On the other hand, when the fuel gas and the air are combusted under the condition of being mixed with the water vapor, the chemical reaction path of the generation of the NOx is changed, and the generation rate of the NOx is inhibited to a certain extent.
A specific structural dimension of the present application is given below:
the diameter of the section of the ignition gun channel 1 is 50mm, and the ignition energy of the ignition gun is 20J; the diameter of the excircle of the section of the central air channel 2 is 100mm, and the diameter of the inner circle is 60 mm; the outlet of the central air channel consists of 16 circular nozzles with the diameter of 5 mm; the diameter of the excircle of the section of the inner air channel 3 is 136mm, and the diameter of the inner circle is 108 mm; the outlet of the inner air channel consists of 1 annular outlet and 16 axial swirl blades; the inner wind annular outlet is provided with 1 expansion section 11 with an expansion angle of 15 degrees; the installation angle of the axial swirl blades at the outlet of the inner air channel is 20 degrees; the fuel input into the fuel channel is natural gas; the diameter of the outer circle of the section of the fuel channel is 199mm, and the diameter of the inner circle of the section of the fuel channel is 159 mm; the outlet of the fuel channel consists of 16 nozzles with the diameter of 15mm multiplied by 10 mm; the diameter of the outer circle of the section of the outer air channel is 276mm, and the diameter of the inner circle is 219 mm; the outlet of the external air channel consists of 18 circular nozzles with the diameter of 12.5 mm; the diameter of the outer wall of the heat insulation layer is 500mm, and the thickness of the outer wall of the heat insulation layer is 100 mm.
The flow of the external wind is regulated to 303Nm through regulating the external wind regulating valve 15, the internal wind regulating valve 12 and the central wind regulating valve 83The/h is reduced to 190Nm3The internal wind flow is 174Nm3Increase of/h to 292Nm3H, the central air flow is 16Nm3The/h is reduced to 10Nm3When the temperature is in the/h range, the peak temperature of the flame of the rotary kiln is reduced from 1819 ℃ to 1736 ℃, the axial length of the high-temperature flue gas higher than 1500 ℃ is reduced from 18.2m to 14.1m, the axial length is moved from 4.1m to 4.6m away from a burner, and NOx in the flue gas at the tail of the rotary kiln is reduced from 8295mg/m3Reduced to 1734mg/m3The oxygen content is increased from 3.1% to 4.3%.
Under the condition that the above conditions are not changed, the humidifying system 19 adopts an ultrasonic atomization mode, and the pressure of compressed air is 0.5 MPa; the spray angle of the nozzle is 30 degrees; downstream of the nozzle 16 of the humidification system 19, the lower wall of the inner air channel 3 is arranged with 5 drainage holes 17; the amount of water supplied to humidification system 19 was 0.2Nm3Under the setting condition of/h, the peak temperature of the flame of the rotary kiln is reduced from 1736 ℃ to 1516 ℃ in cooperation with the adjustment of the air volume of each channel, the axial length of the high-temperature flue gas higher than 1500 ℃ is about zero, and the NOx in the flue gas at the tail of the rotary kiln is 1734mg/m3Reduced to 317mg/m3The oxygen content is increased from 4.3% to 6.0%.
Therefore, the multichannel air distribution adjustment is matched with the rotary kiln combustor for humidifying and reducing nitrogen, so that the adjustment of the flame peak temperature, the flame peak range and the flame peak position in a large range is realized, the generation of NOx can be effectively controlled from the source, the unit control of the waste gas treatment cost is facilitated, and the pollution of the rotary kiln to the atmospheric environment is reduced; and may be directed to different alumina crystal requirements.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are 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 rotary kiln humidification low NOx burner is adjusted in multichannel air distribution which characterized in that: the ignition device comprises ignition gun channels (1), a central air channel (2), an inner air channel (3), a fuel channel (4), an outer air channel (5) and a heat insulation layer (6) which are coaxially arranged from inside to outside, wherein an inlet is arranged at the upstream of each channel, the inlets of the channels are sequentially arranged from top to bottom, an air inlet of the central air channel (2), an air inlet of the inner air channel (3) and an air inlet of the outer air channel (5) are communicated with an air inlet pipe (18), and the heat insulation layer (6) is arranged at the tail end of the outer air channel (5);
a central air regulating valve (8) is arranged in an air inlet of the central air channel (2), an inner air regulating valve (12) is arranged in an air inlet of the inner air channel (3), an outer air regulating valve (15) is arranged in an air inlet of the outer air channel (5), a humidifying system (19) is also arranged in the air inlet of the inner air channel (3), a nozzle (16) of the humidifying system (19) is arranged at the downstream of the inner air regulating valve (12), and a plurality of drain holes (17) are formed in the lower wall of the inner air channel (3) at the downstream of the humidifying system (19);
a plurality of central wind channel outlet nozzles (7) are uniformly arranged at the tail end of the central wind channel (2), the outlet of the inner wind channel (3) is an annular outlet (9), a plurality of axial swirl vanes (10) are uniformly arranged at the annular outlet, and an expansion section (11) is arranged at the position, close to the outlet, of the annular outlet; and a plurality of fuel channel outlet nozzles (13) are uniformly arranged at the tail end of the fuel channel (4), and a plurality of outer wind channel outlet nozzles (14) are uniformly arranged at the tail end of the outer wind channel (5).
2. The multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in claim 1, wherein: 16-20 axial swirl blades (10) are arranged, and the axial swirl blades (10) are uniformly arranged at an inclination angle of 20-25 degrees.
3. The multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in claim 1, wherein: the divergence angle of the divergent section (11) is 15-17 degrees.
4. The multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in claim 1, wherein: the spray angle of the nozzle (16) of the humidifying system (19) is 30-35 degrees.
5. The multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in claim 1, wherein: the central air channel outlet nozzle (7) and the outer air channel outlet nozzle (14) are both circular nozzles; the fuel channel outlet nozzle (13) is a rectangular nozzle.
6. The multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in claim 1, wherein: 16-20 fuel channel outlet nozzles (13), 18-20 outer wind channel outlet nozzles (14), 16-20 central wind channel outlet nozzles (7) and 5-7 drain holes (17).
7. The multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in claim 1, wherein: the humidifying system (19) is a humidifier.
8. The multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in claim 1, wherein: the thickness of the heat insulation layer (6) is 100-150 mm.
9. The multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in claim 1, wherein: and the air inlet of the inner air channel (3) and the air inlet of the outer air channel (5) are obliquely arranged.
10. A multichannel air distribution adjusting rotary kiln humidifying low-nitrogen burner as claimed in any one of claims 1-9, characterized in that: the ignition gun channel (1) is in threaded connection with the ignition gun.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112283708A (en) * | 2020-11-16 | 2021-01-29 | 哈尔滨工业大学 | Multichannel air distribution adjusting rotary kiln humidifying low-nitrogen combustor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112283708A (en) * | 2020-11-16 | 2021-01-29 | 哈尔滨工业大学 | Multichannel air distribution adjusting rotary kiln humidifying low-nitrogen combustor |
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