CN213901049U - Pulverized coal low-nitrogen burner with precombustion chamber and low-temperature flue gas circulation and pulverized coal fired boiler - Google Patents
Pulverized coal low-nitrogen burner with precombustion chamber and low-temperature flue gas circulation and pulverized coal fired boiler Download PDFInfo
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- CN213901049U CN213901049U CN202022961123.5U CN202022961123U CN213901049U CN 213901049 U CN213901049 U CN 213901049U CN 202022961123 U CN202022961123 U CN 202022961123U CN 213901049 U CN213901049 U CN 213901049U
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Abstract
The utility model provides a take low nitrogen combustor of buggy and pulverized coal boiler that low temperature flue gas circulation was adopted to antechamber, including ignition fuel pipe, central tuber pipe, a plenum, secondary plenum, central plenum, antechamber, ignition, central tuber pipe cover is established in the outside of ignition fuel pipe, the outside at central tuber pipe is established to a plenum cover, the outside at a plenum is established to a secondary plenum cover, central plenum and central tuber pipe intercommunication, the discharge gate of central tuber pipe, a plenum air outlet and ignition fuel pipe is located inside the antechamber, secondary plenum and antechamber intercommunication, ignition installs on the antechamber, be equipped with on the central plenum and let in circulation fuel pipeBranch pipes of the circulating wind. Solves the problems of long ignition time, high oil consumption, poor stable combustion, low burnout rate and NO of the prior pulverized coal burner for the industrial boilerXInitial emission, and the like, and achieves the aims of improving combustion efficiency and reducing NOXThe purpose of the initial discharge.
Description
Technical Field
The utility model belongs to the technical field of the pulverized coal burner, concretely relates to take low nitrogen burner of pulverized coal and pulverized coal boiler of precombustion chamber adoption low temperature flue gas circulation.
Background
The petroleum exploratory recoverable reserves in China only account for 2.4 percent of the world, the natural gas accounts for 1.2 percent, and the coal accounts for about 14 percent of the exploratory reserves in the world. The resource conditions of rich coal, little gas and lack of oil determine that the coal still occupies the main position of the energy structure of China for a long time.
At present, coal-fired industrial boilers in China are mainly used for industrial production and building heating, the quantity of stored boilers is about more than 50 thousands, chain boilers are taken as main boilers, and the problems of low thermal efficiency, excessive discharge and the like generally exist.
In recent years, by using and introducing foreign advanced technologies, high-efficiency pulverized coal industrial boilers are greatly developed in China, and the high-efficiency pulverized coal industrial boilers have great significance for promoting clean and high-efficiency utilization of coal and improving atmospheric environment. The prior industrial boiler pulverized coal burner in China generally has the defects of long ignition time, high oil consumption, poor stable combustion, low burnout rate to be improved and NOXInitial discharge and the like. Improving combustion technology and improving low-nitrogen performance of the combustor are effective ways to solve the problems.
SUMMERY OF THE UTILITY MODEL
The utility model provides a take precombustion chamber to adopt low temperature flue gas circulation's buggy low-nitrogen burner and pulverized coal fired boiler for solve the pulverized coal burner ignition time that is used for industrial boiler at present long, the oil consumption is high, the nature of surely firing is poor, burn-out rate is on the low side and NOXInitial emission and the like to achieve the aims of improving combustion efficiency and reducing NOXThe purpose of the initial discharge.
The utility model provides a pair of take low nitrogen burner of buggy of precombustion chamber adoption low temperature flue gas circulation, including ignition fuel pipe, central tuber pipe, a plenum, secondary plenum, central plenum, precombustion chamber, ignition, central tuber pipe cover is established in the outside of ignition fuel pipe, the outside at central tuber pipe is established to a plenum cover, the outside at a plenum is established to the secondary plenum cover, central plenum and central tuber pipe intercommunication, the discharge gate of central tuber pipe, a plenum air outlet and ignition fuel pipe is located inside the precombustion chamber, secondary plenum and precombustion chamber intercommunication, ignition installs on the precombustion chamber, be equipped with the branch pipe that lets in the circulated air on the central plenum.
Preferably, the secondary air cyclone device further comprises secondary air cyclone blades, the secondary air cyclone blades are arranged in the secondary air chamber and the pre-combustion chamber, and the angle of the secondary air cyclone blades can be adjusted.
Preferably, the discharge port of the ignition fuel pipe, the central air pipe and the air outlet of the primary air chamber are positioned inside the secondary air swirling blades.
Preferably, the branch pipe is provided with an air volume adjusting valve.
Preferably, the air inlet of the secondary air chamber is provided with an air door baffle, and the opening degree of the air door baffle is adjustable.
Preferably, a central air swirling flow blade is arranged between the air outlet of the central air pipe and the ignition fuel pipe.
Preferably, a circulating air chamber is arranged outside the pre-combustion chamber, a circulating air pipe is arranged on the circulating air chamber, a circulating air door is arranged on the circulating air pipe, and the opening degree of the circulating air door is adjustable.
The utility model also provides a pulverized coal boiler, pulverized coal boiler has adopted the utility model discloses a take prechamber to adopt low temperature flue gas circulation's buggy low-nitrogen burner.
The utility model has the advantages that:
the micro-oil ignition technology is adopted, and the pre-combustion chamber is arranged to maintain higher temperature of a combustion center at the initial stage of ignition, so that the rapid micro-oil ignition of pulverized coal jet is realized, the stable combustion performance is improved, the oil consumption is low, the ignition difficulty is reduced, the ignition cost is reduced, and the adaptability of coal types can be improved;
because the central air cyclone blade is additionally arranged in the central air pipe, the central air has the function of coal seeding and can supply oxygen to a backflow area in an initial combustion center, the central air can be properly mixed with low-temperature flue gas, the function of coal seeding is ensured, the oxygen supply is properly reduced, the combustion progress of pulverized coal is slowed down, and NO is reducedXGeneration of (1);
the opening degree of the air door baffle plate and the angle of the secondary air swirl vane are adjusted to strengthen the mixing effect of primary air powder, central air and main combustion air, low-temperature flue gas is mixed with the central air, the temperature of the precombustion chamber is controlled by circulating air, and oxygen is supplemented appropriately, so that the processes of initial-stage oxygen-poor combustion, middle-stage oxygen-poor combustion and rear-stage appropriate oxygen-supplement burnout of pulverized coal are realized, and NO is reducedXGeneration of (1);
for controlling fuel type NOXThe generation of the flame is realized by adjusting the opening degree of the damper of the air door of the main combustion air inlet, so that the low air excess coefficient of a larger area in the center of the flame is realized, and the reducing atmosphere in a longer range in the axial direction of the combustor of the precombustion chamber is ensured, thereby reducing NOXGenerating;
low temperature flue gas recirculation is introduced, the temperature of the precombustion chamber can be reduced, the burner is protected, the integral temperature of the hearth is maintained, and NO is inhibitedXIs generated.
Drawings
Fig. 1 is a schematic structural view of the pulverized coal low-nitrogen burner with a precombustion chamber adopting low-temperature flue gas circulation according to the present invention.
The attached drawings are marked as follows:
1. an ignition fuel tube; 2. a central air duct; 3. a primary air chamber; 4. a secondary air chamber; 5. a central air chamber; 6. a precombustion chamber; 7. an ignition device; 8. a branch pipe; 9. a secondary air swirl vane; 10. an air volume adjusting valve; 11. a central wind swirl vane; 12. a circulating air chamber; 13. and circulating the air pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the scope of the invention.
Examples
Referring to fig. 1, the pulverized coal low-nitrogen combustion device with a precombustion chamber and adopting low-temperature flue gas circulation of the embodiment comprises an ignition fuel pipe 1, a central air pipe 2, a primary air chamber 3, a secondary air chamber 4, a central air chamber 5, a precombustion chamber 6 and an ignition device 7, the central air pipe 2 is sleeved outside the ignition fuel pipe 1, the primary air chamber 3 is sleeved outside the central air pipe 2, the secondary air chamber 4 is sleeved outside the primary air chamber 3, the central air chamber 5 is communicated with the central air pipe 2, the central air pipe 2, the air outlet of the primary air chamber 3 and the discharge hole of the ignition fuel pipe 1 are positioned in the precombustion chamber 6, the secondary air chamber 4 is communicated with the precombustion chamber 6, the ignition device 7 is arranged on the precombustion chamber 6, the ignition device 7 of the embodiment comprises an igniter and a propeller, and the central air chamber 5 is provided with a branch pipe 8 for introducing circulating air.
The ignition fuel pipe 1 is internally provided with fuel oil which is used for ignition, the primary air chamber 3 is internally provided with primary air, the primary air is supplied along a gap between the primary air chamber 3 and the central air pipe 5, the central air chamber 5 is internally provided with central air, and the secondary air chamber 4 is internally provided with main fuel air. The primary air volume is fixed and is provided by a Roots blower, and the primary air volume carries pulverized coal to enter the combustor of the embodiment through the mixer. The central air at the inner side of the primary air is taken from the secondary air, and the air quantity can be adjusted. The main combustion air outside the primary air is also taken from the secondary air, and the air quantity can be adjusted. By strengthening the mixing effect of the primary air powder, the central air and the main combustion air, the pulverized coal is combusted in a grading way, and NO is reducedXIs generated. The circulating air is low-temperature flue gas obtained after a boiler induced draft fan, the air quantity is adjustable, the circulating air pressure is higher than the secondary air pressure in the running state, the low-temperature flue gas with low oxygen content is mixed into the central air, the oxygen content of the central air is reduced, so that pulverized coal in a combustion center is not completely combusted under the anoxic condition, the temperature of the combustion center is reduced, and the generation of nitrogen oxides is reduced.
In order to adjust the intake of the main combustion air, as a preferred embodiment of the present embodiment, the burner of the present embodiment further includes a secondary air swirling vane 9, the secondary air swirling vane 9 is disposed inside the secondary air chamber 4 and the pre-combustion chamber 6, the angle of the secondary air swirling vane 9 is adjustable, and the discharge port of the ignition fuel pipe 1, the central air pipe 2, and the air outlet of the primary air chamber 3 are located inside the secondary air swirling vane 9. The air inlet amount of the main combustion air is controlled by adjusting the air inlet angle between the secondary air swirl vanes 9 and the main combustion air.
In order to adjust the intake of the circulating air, as a preferred embodiment of this embodiment, the branch pipe 8 is provided with an air volume adjusting valve 10, and the intake of the circulating air can be controlled by adjusting the opening of the air volume adjusting valve 10, so as to control the amount of the circulating air mixed into the central air, so that the pulverized coal in the combustion center is not completely combusted under the oxygen-deficient condition, the temperature of the combustion center is reduced, and the generation of nitrogen oxides is reduced. The air volume adjusting valve 10 of the present embodiment employs a manual butterfly valve.
In order to realize low air excess coefficient (less than or equal to 1) in a larger area of the flame center, ensure reducing atmosphere in a longer range of the axial direction of a combustor of the precombustion chamber 6, and control combustion type NOXThe air inlet of the secondary air chamber 4 is provided with an air door baffle (not shown in the figure), and the opening degree of the air door baffle can be adjusted. The opening of the air door baffle and the angle of the secondary air cyclone blade 9 are adjusted to strengthen the mixing effect of primary air powder, central air and main combustion air, so that the pulverized coal is combusted in a grading way, and the generation of nitrogen oxides is reduced.
In order to realize that the central air has the function of 'coal spreading', a central air rotational flow blade 11 is arranged between the air outlet of the central air pipe 2 and the ignition fuel pipe 1, the central air rotational flow blade 11 is a fixedly welded blade, and the central air rotational flow blade 11 can supply oxygen to a central reflux area of initial combustion.
In order to reduce the temperature of the precombustion chamber 6, protect the burner, maintain the overall temperature of the hearth, inhibit the production of nitrogen oxide, the outside circulation plenum 12 that sets up of precombustion chamber 6, be provided with circulation tuber pipe 13 on the circulation plenum 12, be provided with circulation air door (not shown in the figure) on the circulation tuber pipe 13, the aperture of circulation air door is adjustable, what let in the circulation plenum 12 also is the circulated air, the circulated air is taken from low temperature flue gas behind the boiler draught fan. The air intake of the circulating air is adjusted by adjusting the opening of the circulating air door (the air intake of the circulating air can be adjusted to be about 25% of the total air volume at most), so that a pulverized coal combustion torch can be shaped, the residual oxygen in the flue gas is supplied in place, and the phenomena that the pulverized coal is burnt out, the pulverized coal is brushed, and coking is generated due to local oxygen cut-off caused by pulverized coal combustion in a hearth; meanwhile, the temperature of the precombustion chamber 6 is reduced, the burner is cooled, and the over-high temperature of the burner is prevented. In addition, an opening regulating valve can be arranged on an air channel in front of an inlet of a circulating fan (not shown in the figure) for providing circulating air, the air channel is communicated with the atmosphere and is properly opened to provide the oxygen content in the circulating air, so that the pulverized coal tends to be burnt out.
The buggy low-nitrogen burner that the area precombustion chamber adopted low temperature gas recirculation that this embodiment provided, fully considered middle-size and small-size buggy industrial boiler water-cooling degree height, the big defect of flame temperature gradient, adopt tiny-oil ignition technique, set up the precombustion chamber, the degree of difficulty of catching fire has been reduced, the regulation and the abundant reaction of burning of the air of burning out have created the condition for the later stage in the burning, through central wind, the supplementary combustion-supporting of air distribution regulation and control and circulated air of main burning wind, the fractional combustion of buggy has been realized, be applicable to buggy industrial boiler very much, therefore, this embodiment still provides a pulverized coal fired boiler, pulverized coal fired boiler has adopted the utility model discloses a take the precombustion chamber to adopt low temperature gas recirculation's buggy low-nitrogen combustor.
Claims (8)
1. The utility model provides a take precombustion chamber to adopt low temperature flue gas circulation's buggy low NOx burner which characterized in that: including ignition fuel pipe, central tuber pipe, primary plenum, secondary plenum, central plenum, antechamber, ignition, central tuber pipe cover is established in the outside of ignition fuel pipe, primary plenum cover is established in the outside of central tuber pipe, the outside of primary plenum is established to the secondary plenum cover, central plenum and central tuber pipe intercommunication, the discharge gate of central tuber pipe, primary plenum air outlet and ignition fuel pipe is located inside the antechamber, secondary plenum and antechamber intercommunication, ignition installs on the antechamber, be equipped with the branch pipe that lets in the circulated air on the central plenum.
2. The pulverized coal low-nitrogen burner with the precombustion chamber and adopting low-temperature flue gas circulation as claimed in claim 1, which is characterized in that: the secondary air swirl blades are arranged in the secondary air chamber and the pre-combustion chamber, and the angle of the secondary air swirl blades can be adjusted.
3. The pulverized coal low-nitrogen burner with the precombustion chamber and adopting low-temperature flue gas circulation as claimed in claim 2, characterized in that: and the discharge port of the ignition fuel pipe, the central air pipe and the air outlet of the primary air chamber are positioned inside the secondary air swirling blades.
4. The pulverized coal low-nitrogen burner with the precombustion chamber and adopting low-temperature flue gas circulation as claimed in claim 1, which is characterized in that: and the branch pipe is provided with an air volume regulating valve.
5. The pulverized coal low-nitrogen burner with the precombustion chamber and adopting low-temperature flue gas circulation as claimed in claim 1, which is characterized in that: and an air door baffle is arranged at the air inlet of the secondary air chamber, and the opening degree of the air door baffle is adjustable.
6. The pulverized coal low-nitrogen burner with the precombustion chamber and adopting low-temperature flue gas circulation as claimed in claim 1, which is characterized in that: and a central air swirling flow blade is arranged between the air outlet of the central air pipe and the ignition fuel pipe.
7. The pulverized coal low-nitrogen burner with the precombustion chamber and adopting low-temperature flue gas circulation as claimed in claim 1, which is characterized in that: and a circulating air chamber is arranged outside the precombustion chamber, a circulating air pipe is arranged on the circulating air chamber, a circulating air door is arranged on the circulating air pipe, and the opening degree of the circulating air door is adjustable.
8. A pulverized coal fired boiler is characterized in that: the pulverized coal low-nitrogen burner adopting low-temperature flue gas circulation by adopting the precombustion chamber of any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022961123.5U CN213901049U (en) | 2020-12-09 | 2020-12-09 | Pulverized coal low-nitrogen burner with precombustion chamber and low-temperature flue gas circulation and pulverized coal fired boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022961123.5U CN213901049U (en) | 2020-12-09 | 2020-12-09 | Pulverized coal low-nitrogen burner with precombustion chamber and low-temperature flue gas circulation and pulverized coal fired boiler |
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| Publication Number | Publication Date |
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| CN213901049U true CN213901049U (en) | 2021-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022961123.5U Active CN213901049U (en) | 2020-12-09 | 2020-12-09 | Pulverized coal low-nitrogen burner with precombustion chamber and low-temperature flue gas circulation and pulverized coal fired boiler |
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| Country | Link |
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| CN (1) | CN213901049U (en) |
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