CN215637292U - Boiler overgrate air system with pressure boost bypass - Google Patents
Boiler overgrate air system with pressure boost bypass Download PDFInfo
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- CN215637292U CN215637292U CN202121459898.0U CN202121459898U CN215637292U CN 215637292 U CN215637292 U CN 215637292U CN 202121459898 U CN202121459898 U CN 202121459898U CN 215637292 U CN215637292 U CN 215637292U
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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
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Abstract
The utility model discloses a boiler secondary air system with a supercharging bypass, which comprises a blower and an air preheater which are sequentially connected, wherein the air preheater is connected with an outlet pipeline, the outlet pipeline is connected with an adherent air inlet of a boiler, an outlet branch pipeline is arranged on the outlet pipeline, the outlet branch pipeline is connected with a supercharging fan, the supercharging fan is connected with a first branch pipeline, and the first branch pipeline is connected with an adherent air nozzle; a first cooling sleeve is sleeved on the outer diameter of the outlet branch pipeline and connected with an air compressor, and the first cooling sleeve is connected to a booster fan; the air compressor is also provided with a compressed air branch pipeline, the compressed air branch pipeline is connected to a second cooling sleeve, the second cooling sleeve is sleeved on the outlet pipeline, and the second cooling sleeve is connected with an output pipeline or a wall-mounted wind nozzle; when the second cooling jacket is connected to the close-wall wind nozzle; the jet orifice of the second cooling sleeve faces the hearth. The utility model can solve the high-temperature corrosion phenomenon of the water-cooled wall.
Description
Technical Field
The utility model belongs to the technical field of optimization of power station boilers, and particularly belongs to a boiler secondary air system with a pressurizing bypass.
Background
The opposed combustion mode is widely applied to large-capacity power station boilers, and the following problems generally exist in the operation of the opposed combustion mode: water-cooled wall side wall high temperature corrosion, in order to solve high temperature corrosion, need increase adherence wind, generally use the overgrate air as adherence wind regime, the operation practice shows: because the secondary air pressure, the air quantity and the fault rate of the whole secondary fan set are all influencing factors influencing the effect of the adherence air, how to reasonably solve the influencing factors of the adherence air is realized, thereby ensuring the anti-corrosion capability of the adherence air to the water-cooled wall and becoming the problem to be solved in the field of high-temperature corrosion of the water-cooled wall.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems in the prior art, the utility model provides a boiler secondary air system with a supercharging bypass, which solves the problem that the high-temperature corrosion of the water-cooling side wall of a boiler still exists because the wall-attached air is difficult to adjust at present,
in order to achieve the purpose, the utility model provides the following technical scheme: a boiler secondary air system with a pressurizing bypass comprises a blower and an air preheater which are sequentially connected, wherein an outlet of the air preheater is connected with an outlet pipeline, an outlet of the outlet pipeline is connected with an adherent air inlet of a boiler, an outlet branch pipeline is arranged on the outlet pipeline, an outlet of the outlet branch pipeline is connected with a pressurizing fan, an outlet of the pressurizing fan is connected with a first branch pipeline, and an outlet of the first branch pipeline is connected to an adherent air nozzle;
a first cooling sleeve is sleeved on the outer diameter of the outlet branch pipeline, an inlet of the first cooling sleeve is connected with an air compressor, and an outlet of the first cooling sleeve is connected to an inlet of a booster fan;
the outlet of the air compressor is also provided with a compressed air branch pipeline, the outlet of the compressed air branch pipeline is connected to a second cooling sleeve, the second cooling sleeve is sleeved on the outlet pipeline, and the outlet of the second cooling sleeve is connected with an output pipeline or connected to a wall-mounted air nozzle;
when the outlet of the second cooling sleeve is connected to the adherent wind nozzle; the jet orifice of the second cooling sleeve faces the hearth.
Furthermore, an adjusting door is arranged on the outlet branch pipeline and is positioned between the first cooling sleeve and an inlet of the booster fan.
Furthermore, an air quantity measuring device is arranged between the adjusting door and the booster fan.
Furthermore, the wall-adhering air nozzle is an annular nozzle.
Furthermore, an isolation door is arranged at the inlet of the outlet branch pipeline.
Furthermore, a pressure measuring point is arranged on the first branch pipeline, and a first pressure sensor is arranged on the pressure measuring point.
Furthermore, a first branch pipeline adjusting door is further arranged at the inlet of the first branch pipeline.
Furthermore, the outlet of the booster fan is also connected with a second branch pipeline, and the outlet of the second branch pipeline is connected to the over-fire air nozzle.
Furthermore, a second branch pipeline adjusting door is arranged at the inlet of the second branch pipeline.
Furthermore, the booster fan is also connected with a frequency converter.
Compared with the prior art, the utility model has at least the following beneficial effects:
the utility model provides a boiler secondary air system with a supercharging bypass, which is characterized in that an air preheater is arranged at an outlet of an air feeder to increase the temperature of air, so that the temperature of an adherent air nozzle is ensured, meanwhile, a branch is also arranged on an outlet pipeline of the air feeder, a supercharging fan is arranged on the outlet branch pipeline, part of air quantity transmitted by the air feeder is distributed to the outlet branch pipeline, secondary air of the outlet branch pipeline is supercharged by the supercharging fan, the momentum of adherent air is effectively improved, high-temperature corrosion is relieved, and the operation safety and the economic performance of an opposed combustion boiler are improved. Meanwhile, the air quantity of the wall-mounted air is increased through the air compressor, the air quantity of the wall-mounted air is ensured, the compressed air absorbs the heat of the outlet branch pipeline through the first cooling sleeve to be preheated, then the compressed air is mixed with the heated secondary air at the inlet of the booster fan, the compressed air and the heated secondary air are favorably and fully mixed, and the direct mixing of low-temperature gas of the compressed air and the heated secondary air is avoided, so that the temperature of the secondary air in the whole pipeline is uneven, the combustion effect of a hearth is finally influenced, the preheated compressed air can reduce the temperature of the heated secondary air to a certain degree, the phenomenon that the overheated secondary air enters the booster fan and burns the booster fan is avoided, the long-time normal operation of the whole unit is realized, and the service life is ensured; and the secondary air increases the outlet branch pipeline and increases the heat consumption of the secondary air, in order to ensure the air temperature of the input wall-attached air, the air temperature output by the air preheater needs to be improved, the outlet pipeline has shorter distance compared with the outlet branch pipeline, in order to ensure the normal use of the wall-attached air, a part of compressed air is introduced onto the outlet pipeline, shares the part of heat in the outlet pipeline, ensures the normal use of the outlet pipeline and the wall-attached air nozzle, simultaneously the compressed air after absorbing the heat of the secondary air in the outlet pipeline is blown to the hearth, prevents the wall-attached air nozzle from causing high temperature damage when the temperature in the hearth is extremely high, or directly recycles or processes the compressed air absorbing the heat through the outlet pipeline, the utility model enhances the air pressure of the secondary air through a booster fan, increases the air volume through an air compressor, and simultaneously utilizes a first cooling sleeve and a second cooling sleeve to add the compressed air to the whole secondary air system softly, and through the cooperation of first cooling jacket and second cooling jacket, realize the long-time safe and reliable operation of whole secondary fan group to guarantee the anticorrosive ability of adherence wall wind to the water-cooling wall, solve the high temperature corrosion phenomenon of water-cooling wall.
Furthermore, the outlet branch pipeline is provided with the adjusting door, so that the supercharging air quantity of secondary air can be flexibly adjusted and controlled, and the secondary air can be flexibly adjusted and controlled according to actual conditions, and is convenient and fast.
Furthermore, the air volume measuring device arranged between the adjusting door and the booster fan is convenient to adjust the on-off degree of the adjusting door according to the measured value of the air volume measuring device, and the air volume measuring device is simple to operate, convenient and fast.
Furthermore, the wall-attached air nozzles adopt annular nozzles, so that secondary air and pressurized secondary air can be sprayed out of the periphery of the hearth to cover the whole hearth.
Furthermore, the isolation door arranged on the outlet branch pipeline can isolate the outlet branch pipeline, and the isolation door and the dual isolation of the adjusting door can enhance the isolation capability of the outlet branch pipeline.
Furthermore, the first pressure measuring point arranged on the first branch pipeline can measure the supercharged secondary air output by the booster fan, so that the power of the booster fan is adjusted, and the requirement of inputting the supercharged secondary air into the wall-attached air nozzle is met.
Furthermore, the frequency converter connected with the booster fan can adjust the current and the voltage of the booster fan, so that the automation degree is higher, and convenience and rapidness are realized.
Furthermore, be equipped with first branch pipeline governing door on the first branch pipeline, be equipped with the second branch pipeline governing door on the second branch pipeline, can realize the pressure boost of adherence wind momentum and overfire air momentum through the nimble application of first branch pipeline governing door and second branch pipeline governing door, CO concentration in the boiler flue gas is on the high side at present, the main reason is that the overgrate air pressure head is on the low side, the direct current wind momentum of overfire air inner core is not enough, can not effectively pierce through high temperature flue gas, lead to the CO of furnace center not fully burning, form the incomplete combustion heat loss of chemistry, cause boiler economy to descend, import overfire air nozzle department with the pressurized overgrate air through the second branch pipeline, increase the ability that the overfire air efflux pierces through high temperature flue gas, alleviate high temperature corrosion and reduce the combustion loss, improve boiler operation security and the economic performance of hedging burning.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of another embodiment of the present invention;
in the drawings: the method comprises the following steps of 1-a blower, 2-an air preheater, 3-a regulating gate, 4-a booster fan, 5-an over-fire air nozzle, 6-an adherent air nozzle, 7-a second branch pipeline, 8-a first branch pipeline, 9-a pressure measuring point, 10-a first branch pipeline regulating gate, 11-a second branch pipeline regulating gate, 12-a first cooling sleeve, 13-an air compressor, 14-a first compressed air regulating gate, 15-a second compressed air regulating gate, 16-a compressed air branch pipeline, 17-a second cooling sleeve, 18-a main compressed air pipeline, 19-a first outlet regulating gate and 20-a second outlet regulating gate.
Detailed Description
The utility model is further described with reference to the following figures and detailed description.
As shown in fig. 1 and 2, the utility model provides a boiler secondary air system with a pressurized bypass, which comprises a blower 1, an air preheater 2, a booster fan 4, an over-fire air nozzle 5 and an over-fire air nozzle 6, wherein a bypass pipeline is added on an air pipe at the secondary air outlet side of the air preheater 2, the booster fan 4 is installed on the bypass pipeline, and after about 15% of the total secondary air quantity flows through the bypass and the booster fan, the air pressure is lifted by about 3Kpa and then is used as an air source of a direct flow part of over-fire air and over-fire air; and the bypass air pipe is provided with an adjusting door and an air quantity measuring device.
In this embodiment, including blower 1 and air preheater 2 that connect gradually, the exit linkage of air preheater 2 has the export pipeline, and the exit linkage of export pipeline is equipped with the export branch pipeline at the adherence wind entry of boiler on the export pipeline, the exit linkage of export branch pipeline has booster fan 4, booster fan 4's exit linkage has first minute pipeline 8, the exit linkage of first minute pipeline 8 is on adherence wind spout 6.
In the preferred embodiment of this embodiment, the outer diameter of the outlet branch pipe is sleeved with a first cooling sleeve 12, in this embodiment, the first cooling sleeve 12 is arranged near the inlet of the regulating valve, the inlet of the first cooling sleeve 12 is connected with an air compressor 13 through a main compressed air pipe 18, the main compressed air pipe 18 is provided with a first compressed air regulating valve 14, the air volume of the compressed air input into the first cooling sleeve 12 can be regulated through the first compressed air regulating valve 14, and the outlet of the first cooling sleeve 12 is connected to the inlet of the booster fan 4;
furthermore, a compressed air branch pipe 16 is arranged at the outlet of the air compressor 13, a compressed air second adjusting door 15 is arranged on the compressed air branch pipe 16, the air quantity of the compressed air input into the second cooling sleeve 17 is adjusted through the second compressed air adjusting door 15, the outlet of the compressed air branch pipeline 16 is connected to the second cooling sleeve 17, the second cooling sleeve 17 is sleeved on the outlet pipeline, in the embodiment, the second cooling sleeve 17 is arranged close to the outlet of the outlet pipeline, the outlet of the second cooling sleeve 17 is connected with an output pipeline or connected to the wall-attached wind nozzle 6, wherein the output pipeline is provided with a first outlet adjusting door which can control the opening or closing of the output pipeline, a second outlet adjusting door 20 is arranged on the pipeline between the second cooling sleeve and the wall-attached air nozzle, the compressed air which absorbs heat in the second cooling sleeve 17 is controlled to enter the boiler from the wall-attached air nozzle 6 through the second outlet adjusting door 20;
in this embodiment, when the outlet of the second cooling jacket 17 is connected to the adherent wind nozzle 6; the injection ports of the second cooling jacket 17 face the furnace.
Specifically, after the secondary air output by the air feeder 1 is heated by the air preheater 2, a part of the secondary air is directly input into the wall-adhering air nozzle 6, 15% of the secondary air quantity in the embodiment enters the booster fan 4 through the outlet branch pipeline, the booster fan 4 boosts the secondary air to increase the pressure of the secondary air, and the boosted secondary air enters the wall-adhering air nozzle 6 through the first branch pipeline 8, so that the momentum of the wall-adhering air is effectively increased, and the high-temperature corrosion is relieved; the secondary air heated by the air preheater is increased due to the addition of the outlet branch pipeline, the frequency of the air preheater is required to be increased, the air temperature of secondary air is increased, a first compressed air adjusting door and/or a second compressed air adjusting door can be selectively opened to ensure the normal operation of the booster fan and the outlet pipeline, compressed air enters the first cooling sleeve after the first compressed air adjusting door is opened, the compressed air absorbs the air temperature of the secondary air heated in the outlet branch pipeline, and the compressed air after heat absorption exits the first cooling sleeve and enters the booster fan to be flexibly combined with the heated secondary air, so that the full mixing and the uniform air temperature are ensured, and the phenomenon that the overheated secondary air enters the booster fan to damage the booster fan is avoided; meanwhile, a second compressed air adjusting door is selected to be opened, compressed air enters a second cooling sleeve, the compressed air absorbs heat of secondary air heated in an outlet pipeline, the compressed air after heat absorption enters an adherence air nozzle through the second outlet adjusting door when the second outlet adjusting door is opened, a jet orifice of the heated compressed air faces a hearth of the boiler, the heated compressed air is opposite to the hearth, the jetted heated compressed air can be blown to the hearth, when the temperature in the hearth is extremely high and high-temperature damage can be caused to the adherence air nozzle, the heated compressed air is blown to the hearth, and the heated compressed air can blow away high-temperature flame near the adherence air nozzle and can reduce the temperature influence on the hearth, so that the adherence air nozzle is in a safe working environment and is prevented from being damaged, and certainly, the hearth airflow is prevented from being disturbed by the heated compressed air, the heated compressed air can be output or recycled through the compressed air first outlet door, or the bypass of the air compressor into the compressed air branch pipeline is directly closed through the compressed air second regulating door.
Preferably, the wall-attached air nozzles 6 adopt annular nozzles, so that secondary air and pressurized secondary air can be sprayed out of the periphery of the hearth to cover the whole hearth.
In the embodiment, a second branch pipeline 7 is further arranged, the second branch pipeline 7 is also connected to an outlet of the booster fan 4, the outlet of the second branch pipeline 7 is connected to the over-fire air nozzle 5, and part of pressurized secondary air is guided to enter the over-fire air nozzle 5, so that the capability of the over-fire air jet flow penetrating through high-temperature flue gas is improved, the combustion heat loss is reduced, and the operation safety and the economic performance of an opposed combustion boiler are improved;
in this embodiment, the outlet branch pipe is provided with the adjusting door 3, the adjusting door is located between the inlets of the first cooling jacket 17 and the booster fan 4, the amount of secondary air input to the booster fan 4 is adjusted through the adjusting door 3, preferably, an air volume measuring device is arranged between the adjusting door 3 and the booster fan 4, and the opening degree of the adjusting door is controlled according to actual conditions, the pressure of over-fire air, the pressure of wall-mounted air and the air volume measuring device, and the air volume is controllable.
Preferably, the entrance of export branch pipeline is equipped with isolated door, and when the pressure of overgrate air was enough, through isolated door and the dual block of adjusting door 3, guarantee outlet pipeline's sealing performance.
As shown in fig. 2, a schematic diagram of the air compressor system is omitted, in this embodiment, the first branch duct 8 and the second branch duct 7 are respectively provided with the first branch duct adjusting door 10 and the second branch duct adjusting door 11, the flow direction of the pressurized secondary air can be flexibly adjusted through the first branch duct adjusting door 10 and the second branch duct adjusting door 11, and the secondary air can be flexibly adjusted and distributed according to actual conditions.
Preferably, still be equipped with pressure measuring point 9 on the first branch pipeline 8, be equipped with first pressure sensor on the pressure measuring point 9, can measure the pressure of the pressure boost overgrate air of booster fan 4 output through first pressure sensor, when unsatisfying the actual requirement, can adjust booster fan 4 in a flexible way, preferably, booster fan 4 is connected with the converter, changes booster fan 4's electric current and voltage through the converter to increase or reduce the pressure of the pressure boost overgrate air of booster fan 4 output, adjust convenient and fast.
In conclusion, compared with the existing secondary air system of the boiler, the newly added system has simple composition, can effectively improve the momentum of the wall-attached air and the capability of SOFA jet of the over-fired air to penetrate through high-temperature flue gas, relieves high-temperature corrosion, reduces the loss of combustion heat, and improves the operation safety and economic performance of the opposed firing boiler.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The boiler secondary air system with the supercharging bypass is characterized by comprising an air feeder (1) and an air preheater (2) which are sequentially connected, wherein an outlet of the air preheater (2) is connected with an outlet pipeline, an outlet of the outlet pipeline is connected to an adherent air inlet of a boiler, an outlet branch pipeline is arranged on the outlet pipeline, an outlet of the outlet branch pipeline is connected with a supercharging fan (4), an outlet of the supercharging fan (4) is connected with a first branch pipeline (8), and an outlet of the first branch pipeline (8) is connected to an adherent air nozzle (6);
a first cooling sleeve (12) is sleeved on the outer diameter of the outlet branch pipeline, an inlet of the first cooling sleeve (12) is connected with an air compressor (13), and an outlet of the first cooling sleeve (12) is connected to an inlet of the booster fan (4);
a compressed air branch pipeline (16) is further arranged at the outlet of the air compressor (13), the outlet of the compressed air branch pipeline (16) is connected to a second cooling sleeve (17), the second cooling sleeve (17) is sleeved on the outlet pipeline, and the outlet of the second cooling sleeve (17) is connected with an output pipeline or is connected to an adherence wind nozzle (6);
when the outlet of the second cooling jacket (17) is connected to the adherent wind nozzle (6); the jet orifice of the second cooling sleeve (17) faces the hearth.
2. The boiler overfire air system with the supercharging bypass according to claim 1, wherein said outlet branch duct is provided with an adjusting gate (3), said adjusting gate (3) being located between the first cooling jacket (17) and the inlet of the supercharging blower (4).
3. The boiler overgrate air system with the supercharging bypass according to claim 2, characterized in that an air volume measuring device is arranged between the adjusting door (3) and the supercharging blower (4).
4. The boiler overfire air system with the pressurized bypass according to claim 1, characterized in that said close-coupled air jets (6) are annular jets.
5. The boiler overfire air system with the forced air bypass according to claim 1, wherein said outlet branch duct is provided with an isolation door at its inlet.
6. The boiler overgrate air system with the supercharging bypass according to claim 1, wherein a pressure measuring point (9) is provided on the first branch pipe (8), and a first pressure sensor is provided on the pressure measuring point (9).
7. The boiler overfire air system with the pressurized bypass according to claim 1, characterized in that said first branch duct (8) is further provided at its inlet with a first branch duct adjusting gate (10).
8. The boiler overfire air system with the pressurized bypass according to claim 1, characterized in that a second branch duct (7) is further connected to the outlet of said booster fan (4), and the outlet of said second branch duct (7) is connected to the overfire air nozzle (5).
9. The boiler overfire air system with the pressurized bypass according to claim 8, characterized in that said second branch duct (7) is provided at its inlet with a second branch duct adjusting gate (11).
10. The boiler overfire air system with the supercharging bypass according to claim 1, characterized in that a frequency converter is further connected to said booster fan (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121459898.0U CN215637292U (en) | 2021-06-29 | 2021-06-29 | Boiler overgrate air system with pressure boost bypass |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121459898.0U CN215637292U (en) | 2021-06-29 | 2021-06-29 | Boiler overgrate air system with pressure boost bypass |
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| Publication Number | Publication Date |
|---|---|
| CN215637292U true CN215637292U (en) | 2022-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121459898.0U Active CN215637292U (en) | 2021-06-29 | 2021-06-29 | Boiler overgrate air system with pressure boost bypass |
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|---|---|
| CN (1) | CN215637292U (en) |
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2021
- 2021-06-29 CN CN202121459898.0U patent/CN215637292U/en active Active
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