CN211667812U - Thick and thin pulverized coal separated low-nitrogen combustor - Google Patents
Thick and thin pulverized coal separated low-nitrogen combustor Download PDFInfo
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- CN211667812U CN211667812U CN202020097899.4U CN202020097899U CN211667812U CN 211667812 U CN211667812 U CN 211667812U CN 202020097899 U CN202020097899 U CN 202020097899U CN 211667812 U CN211667812 U CN 211667812U
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Abstract
The utility model discloses a low NOx burner of rich and weak buggy disconnect-type, including the rich and weak separator of buggy, the buggy pipeline is installed to the positive bottom of the rich and weak separator of buggy, the exhaust air duct way is installed on the top of the rich and weak separator of buggy, the combustor body is installed in the top left side of the rich and weak separator of buggy, an air duct way is installed to the left end of combustor body. According to the thick and thin coal powder separated low-nitrogen combustor, fifty percent of primary air and ten to fifteen percent of coal powder are separated to the nozzle of the exhaust air pipeline through the coal powder thick and thin separator before the coal powder enters the combustor body, so that the fifty percent of primary air and eighty-five to ninety percent of coal powder are left in the primary air pipeline of the main combustor body area, the thick and thin of the coal powder in the primary air pipeline area are further improved, the ignition heat required by ignition of the coal powder is reduced, and the generation amount of thermal NOx is greatly reduced.
Description
The technical field is as follows:
the utility model relates to a buggy separation technical field especially relates to a low NOx burner of thick and thin buggy disconnect-type.
Background art:
with the improvement of environmental requirements and the demands of people, many domestic power plants are carrying out technical transformation work in the aspect of low-nitrogen combustion, and a low-nitrogen combustor is developed along with the improvement of the environmental requirements and the demands of people. However, the existing low-nitrogen burner does not carry out deep research on the concentration separation of the coal powder, so that a concentration coal powder separation type low-nitrogen burner is provided aiming at the functions of the concentration separation of the coal powder and a staged combustion technology in low-nitrogen combustion.
The utility model has the following contents:
an object of the utility model is to provide a low NOx burner of rich and weak buggy disconnect-type to solve prior art not enough.
The utility model discloses by following technical scheme implement: a dense-dilute coal powder separated low-nitrogen combustor comprises a coal powder dense-dilute separator, wherein a coal powder pipeline is installed at the bottom of the front side of the coal powder dense-dilute separator, an exhaust air pipeline is installed at the top end of the coal powder dense-dilute separator, a combustor body is installed on the left side of the top end of the coal powder dense-dilute separator, a primary air pipeline is installed at the left end of the combustor body, an inner air adjusting blade is arranged above the left side of the primary air pipeline and installed in an inner secondary air sleeve, an air adjusting disc is arranged on the right side of the inner secondary air sleeve and installed at the top end of the primary air pipeline, an outer secondary air sleeve is installed at the bottom end of the left side of the primary air pipeline, an outer air adjusting blade is installed inside the outer secondary air sleeve, an outer fixing blade is arranged on the right side of the outer secondary air sleeve, and the outer fixing blade is installed on the right side of the bottom end of the primary air, the right side of the outer fixed blade is provided with an air adjusting sleeve, and the air adjusting sleeve is installed on the outer side of the primary air pipeline.
The top end of the air adjusting disc is provided with an air adjusting disc driving device, the outer side of the air adjusting disc driving device is provided with an inner air adjusting blade driving device, the outer side of the inner air adjusting blade driving device is provided with an outer air adjusting blade driving device, and the other side of the outer air adjusting blade driving device is provided with an air adjusting sleeve driving device.
Preferably, the coal dust concentration separator comprises a diffusion separation device, a cyclone separation device, a separation pipeline and a branch pipe.
Preferably, the ventilation air pipeline is connected with the burner body and arranged above the burner body.
Preferably, the inner air adjusting blade driving device, the outer air adjusting blade driving device and the air adjusting sleeve driving device are all installed at the top end of the air adjusting disc, and the air adjusting disc is arranged at the inlet of the primary air pipeline.
Preferably, the outer wind adjusting blade and the outer fixed blade are arranged on the same side, and the outer wind adjusting blade and the outer fixed blade are arranged at the inlet of the primary wind pipeline.
The utility model has the advantages that: fifty percent of primary air and ten to fifteen percent of coal powder are separated to a nozzle of a ventilation air duct through a coal powder concentration separator before the coal powder enters a burner body, so that the fifty percent of primary air and eighty-five to ninety percent of coal powder left in the primary air duct of a main burner body area are further improved, the concentration of the coal powder in the primary air duct area is further improved, the ignition heat required by the ignition of the coal powder is reduced, the thermal NOx production is greatly reduced, in addition, because the ventilation air and the primary air are both combusted under the condition of deviating from the chemical equivalent ratio, the NOx is very low, the fuel and the air are mixed and combusted in a subsection mode, because the combustion deviates from the theoretical equivalent ratio, the generation of the NOx can be reduced, because the swirling action of secondary air sucks back part of combustion flue gas, enters the burner and is mixed and combusted with the air, due to the recirculation of the flue gas, the heat capacity of the combustion flue gas is large, the combustion temperature is reduced, NOx is reduced, in the environment of insufficient oxygen combustion in the main burner body area stroke, volatile matters are separated out from the fuel in a primary flame area with low oxygen deficiency and flame temperature, and the generation of NOx is reduced.
Description of the 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 described below, it is obvious that the drawings in the following description are only 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 the present invention.
Fig. 2 is a schematic diagram of the pulverized coal pipeline structure of the present invention.
Fig. 3 is a schematic view of the structure of the wind adjusting plate of the present invention.
Wherein: 1. a coal powder shade separator; 2. a pulverized coal pipeline; 3. a ventilation air duct; 4. a burner body; 5. a primary air duct; 6. an internal wind adjusting blade; 7. an inner secondary air sleeve; 8. a wind adjusting plate; 9. an outer secondary air sleeve; 10. an outer register blade; 11. an outer fixed blade; 12. a wind adjusting sleeve; 13. a damper disk drive device; 14. an internal air adjusting blade driving device; 15. an external register blade drive; 16. air adjusting sleeve drive arrangement.
The specific implementation mode is as follows:
the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, 2 and 3, a dense-dilute coal powder separating low-nitrogen burner comprises a coal powder dense-dilute separator 1, it is worth mentioning that nitrogen oxides generated in the combustion process mainly comprise nitrogen monoxide and nitrogen dioxide, the two nitrogen oxides are commonly called nitrogen oxides NOx, the coal powder dense-dilute separator 1 comprises a diffusion separating device, a cyclone separating device, a separating pipeline and a branch pipe, primary air and pulverized coal airflow from a coal mill eccentrically enters a wear-resistant elbow, most pulverized coal particles flow on the inner wall of the outer side of the wear-resistant elbow under the action of inertia and centrifugal force, and simultaneously, under the combined action of separation and guidance of a concentration section and the branch pipe, fifty percent of primary air and ten to fifteen percent of pulverized coal are separated after the pulverized coal airflow passes through the coal powder dense-dilute separator 1 and then are guided to an exhaust nozzle through a ventilation air pipeline 3 to be directly sprayed into a hearth for combustion, the rest fifty percent of primary air and eighty-five to ninety percent of coal powder are sprayed into the furnace for combustion through the primary air pipeline 5, the concentration of the coal powder at the position of the primary air pipeline 5 is improved after concentration, thereby reducing ignition heat required by ignition of the coal powder, being beneficial to ignition and stable combustion of the coal powder, and reducing NOx, the coal powder pipeline 2 is arranged at the bottom end of the front surface of the coal powder concentration-dilution separator 1, the top end of the coal powder concentration-dilution separator 1 is provided with a ventilation air pipeline 3, the left side of the top end of the coal powder concentration-dilution separator 1 is provided with a burner body 4, the ventilation air pipeline 3 is connected with the burner body 4, the burner body 4 is provided with a double-layer axial air adjusting mechanism for strengthening ignition, two secondary air branches from an air box respectively enter an inner layer air regulator and an outer layer air regulator, a rotary air flow generated by the secondary air at the inner layer can suck high-temperature smoke to ignite the coal powder, the secondary air at the, the burner is completely combusted, the rotating directions of the inner layer secondary air and the outer layer secondary air are consistent, the rotational flow strength can be changed by adjusting the setting angle of the axial blades, the high-temperature flue gas in a hearth can be sucked to a coal powder ignition area by the rotating airflow, the coal powder is ignited and stably combusted, the staged air supply mode is adopted, the ignition and stable combustion of the coal powder are facilitated, the adaptability of the burner body 4 to the change of coal quality is enhanced, the generation of NOx in flame is also facilitated to be controlled, the ventilation air duct 3 is arranged above the burner body 4, the primary air duct 5 is arranged at the left end of the burner body 4, the inner air adjusting blades 6 are arranged above the left side of the primary air duct 5, the inner air adjusting blades 6 are arranged in the inner secondary air sleeve 7, the air adjusting disc 8 is arranged on the right side of the inner secondary air sleeve 7, the inner secondary air enters the burner body 4 through an inner secondary air channel formed by the inner secondary air sleeve 7 and the coal powder duct 2, an air adjusting disc 8 is arranged at the inlet end of the passage, the position (namely opening degree) of the air adjusting disc 8 is changed to adjust the air quantity entering the inner secondary air passage, so that the air quantity ratio of the inner secondary air and the outer secondary air of a single combustor body 4 is changed, axial adjustable blades are arranged in the passage, the blades are connected with each other through a crank connecting rod and an inner air adjusting ring, and then are connected with a driving device on an outer cover plate of the combustor body 4 through a connecting pipe, when the inner air adjusting ring moves outwards through a rotary driving device, the opening degree of the axial blades is reduced, the opening degree of the axial blades is increased when the inner air adjusting ring moves inwards, the rotational flow strength of the inner secondary air can be changed by changing the angle of the axial blades, the inner secondary air forms local backflow at a nozzle along the boundary of pulverized coal jet flow, high-temperature flue gas is sucked to form a stable ignition area, the pulverized coal is ensured to be ignited in time, the outer secondary air enters the combustor body 4 through the outer secondary air, the outer secondary air adjusting mechanism comprises two groups of blades, the first group is fixed blades arranged at the front end of a channel and mainly enables air to be uniformly distributed along the circumferential direction of the outer secondary air channel, the second group is axially adjustable blades and mainly enables secondary air to generate strong rotational flow and to be uniformly mixed into flame, a transmission mechanism is the same as the inner air adjusting blades 6, an air adjusting disc 8 is arranged at the top end of a primary air pipeline 5, an outer secondary air sleeve 9 is arranged at the bottom end of the left side of the primary air pipeline 5, outer air adjusting blades 10 are arranged inside the outer secondary air sleeve 9, an inner secondary air sleeve 7 and an outer secondary air sleeve 9 are arranged at an air adjuster inlet of the combustor body 4, the position (namely the opening degree) of the air adjusting sleeve 12 is controlled to control the secondary air quantity entering a single combustor body 4, outer fixed blades 11 are arranged on the right side of the outer secondary air sleeve 9, and the outer fixed blades 11 are arranged on the right side of the bottom end of the, the right side of the outer fixed blade 11 is provided with an air adjusting sleeve 12, and the air adjusting sleeve 12 is installed on the outer side of the primary air pipeline 5.
The top end of the air adjusting disc 8 is provided with an air adjusting disc driving device 13, the outer side of the air adjusting disc driving device 13 is provided with an inner air adjusting blade driving device 14, the outer side of the inner air adjusting blade driving device 14 is provided with an outer air adjusting blade driving device 15, the other side of the outer air adjusting blade driving device 15 is provided with an air adjusting sleeve driving device 16, the inner air adjusting blade driving device 14, the outer air adjusting blade driving device 15 and the air adjusting sleeve driving device 16 are all installed at the top end of the air adjusting disc 8, and the air adjusting disc 8 is arranged at the inlet of the primary air pipeline 5.
The working principle is as follows: fifty percent of primary air and ten to fifteen percent of coal powder are separated to a nozzle of a ventilation air duct 3 by a coal powder concentration separator 1 before the coal powder enters a burner body 4, so that fifty percent of primary air and eighty-five to ninety percent of coal powder are left in a primary air duct 5 in the area of the burner body 4, the concentration of the coal powder in the area of the primary air duct 5 is further improved, ignition heat required by ignition of the coal powder is reduced, the thermal NOx production is greatly reduced, in addition, because the ventilation air and the primary air are both combusted under the condition of deviating from the chemical equivalent ratio, NOx is low, fuel and air are combusted in a sectional mixing manner, because the combustion deviates from the theoretical equivalent ratio, the generation of NOx can be reduced, because the swirling action of secondary air sucks back part of combustion flue gas to enter the burner, with air hybrid combustion, because flue gas recirculation, the thermal capacity of burning flue gas is big, and combustion temperature reduces, and NOx reduces, and in the environment of 4 regional strokes of main burner body oxygen deficient burning, the fuel is in oxygen deficient and flame temperature lower primary flame district interior volatile matter of separating out, has consequently reduced NOx's formation.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A dense-dilute coal powder separated low-nitrogen combustor comprises a coal powder dense-dilute separator (1) and is characterized in that a coal powder pipeline (2) is installed at the bottom of the front side of the coal powder dense-dilute separator (1), an exhaust air pipeline (3) is installed at the top of the coal powder dense-dilute separator (1), a combustor body (4) is installed on the left side of the top of the coal powder dense-dilute separator (1), a primary air pipeline (5) is installed at the left end of the combustor body (4), an inner air adjusting blade (6) is arranged above the left side of the primary air pipeline (5), the inner air adjusting blade (6) is installed in an inner secondary air sleeve (7), an air adjusting disc (8) is arranged on the right side of the inner secondary air sleeve (7), the air adjusting disc (8) is installed on the top of the primary air pipeline (5), an outer secondary air sleeve (9) is installed at the bottom of the left side of the primary air pipeline (5), an outer air adjusting blade (10) is arranged inside the outer secondary air sleeve (9), an outer fixed blade (11) is arranged on the right side of the outer secondary air sleeve (9), the outer fixed blade (11) is arranged on the right side of the bottom end of the primary air pipeline (5), an air adjusting sleeve (12) is arranged on the right side of the outer fixed blade (11), and the air adjusting sleeve (12) is arranged on the outer side of the primary air pipeline (5);
the top end of the air adjusting disc (8) is provided with an air adjusting disc driving device (13), the outer side of the air adjusting disc driving device (13) is provided with an inner air adjusting blade driving device (14), the outer side of the inner air adjusting blade driving device (14) is provided with an outer air adjusting blade driving device (15), and the other side of the outer air adjusting blade driving device (15) is provided with an air adjusting sleeve driving device (16).
2. A lean and rich pulverized coal separating type low-nitrogen burner as claimed in claim 1, wherein the pulverized coal lean and rich separator (1) comprises a diffusion separating device, a cyclone separating device, a separating pipe and a diverging pipe.
3. A dense-thin pulverized coal separated low-nitrogen burner as claimed in claim 1, wherein the ventilation air duct (3) is connected with the burner body (4), and the ventilation air duct (3) is disposed above the burner body (4).
4. A dense-thin pulverized coal separated low-nitrogen burner as claimed in claim 1, wherein the inner air adjusting blade driving device (14), the outer air adjusting blade driving device (15) and the air adjusting sleeve driving device (16) are all installed at the top end of the air adjusting disk (8), and the air adjusting disk (8) is arranged at the inlet of the primary air duct (5).
5. The separated low-nitrogen burner for thick and thin pulverized coal according to claim 1, wherein the outer air adjusting blades (10) and the outer fixed blades (11) are disposed on the same side, and the outer air adjusting blades (10) and the outer fixed blades (11) are disposed at the inlet of the primary air duct (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020097899.4U CN211667812U (en) | 2020-01-16 | 2020-01-16 | Thick and thin pulverized coal separated low-nitrogen combustor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020097899.4U CN211667812U (en) | 2020-01-16 | 2020-01-16 | Thick and thin pulverized coal separated low-nitrogen combustor |
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| CN211667812U true CN211667812U (en) | 2020-10-13 |
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| CN202020097899.4U Active CN211667812U (en) | 2020-01-16 | 2020-01-16 | Thick and thin pulverized coal separated low-nitrogen combustor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781036A (en) * | 2021-02-19 | 2021-05-11 | 北京巴布科克·威尔科克斯有限公司 | Concentrated type double-air-regulation rotational flow low-nitrogen combustor provided with central air |
| CN113028393A (en) * | 2021-04-16 | 2021-06-25 | 西安热工研究院有限公司 | Ultra-low load stable combustion burner suitable for deep peak regulation |
-
2020
- 2020-01-16 CN CN202020097899.4U patent/CN211667812U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112781036A (en) * | 2021-02-19 | 2021-05-11 | 北京巴布科克·威尔科克斯有限公司 | Concentrated type double-air-regulation rotational flow low-nitrogen combustor provided with central air |
| CN113028393A (en) * | 2021-04-16 | 2021-06-25 | 西安热工研究院有限公司 | Ultra-low load stable combustion burner suitable for deep peak regulation |
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