CN212565753U - Stable combustion burner based on temperature control of precombustion chamber - Google Patents
Stable combustion burner based on temperature control of precombustion chamber Download PDFInfo
- Publication number
- CN212565753U CN212565753U CN202022172033.8U CN202022172033U CN212565753U CN 212565753 U CN212565753 U CN 212565753U CN 202022172033 U CN202022172033 U CN 202022172033U CN 212565753 U CN212565753 U CN 212565753U
- Authority
- CN
- China
- Prior art keywords
- precombustion chamber
- secondary air
- combustion
- central air
- pipeline
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a steady combustion burner based on precombustion chamber temperature control, this steady combustion burner's a wind whirl device sets up at the precombustion chamber entry, makes the wind powder mixture produce strong whirl before getting into the precombustion chamber burning, ensures the combustor low-load and surely fires the performance. The inlet of the precombustion chamber is provided with a direct-current central air duct, and the phenomena of coking, burning loss and the like of the precombustion chamber under high load can be avoided by adjusting the opening of the direct-current central air duct. The secondary air with adjustable swirl strength is arranged outside the cavity of the precombustion chamber, so that the mixing of air and powder airflow in the precombustion chamber is delayed, the generation of nitrogen oxides is reduced, and meanwhile, the low-load stable combustion performance and the anti-coking burning loss performance of the combustor can be improved in an auxiliary manner by adjusting the swirl strength of the secondary air. The utility model discloses can effectively improve coal fired boiler degree of depth peak shaving ability, widen the coal quality adaptability of degree of depth peak shaving unit.
Description
Technical Field
The utility model belongs to the technical field of coal fired power plant boiler degree of depth peak shaver, concretely relates to steady combustion burner based on precombustion chamber temperature control.
Background
With the rapid development of renewable energy power generation such as wind power, photovoltaic and the like in China and the change of power consumption characteristics of an electric energy user side, the demand of a power grid system on a flexible power supply is continuously improved, the positioning of coal power in the power grid system is gradually changed from an electric quantity type power supply to an electric quantity and power regulation type power supply, and in order to improve the consumption of renewable energy and ensure the safe and stable operation of a power grid, a coal power unit can bear more functions of peak regulation of the power grid system. With the gradual market transaction of the electric power auxiliary service in various places, units participating in deep peak shaving are subsidized, and the development of deep peak shaving by coal-fired units becomes a necessary trend for improving the profitability of power plants and the competitiveness of the units on the network.
The coal-fired unit carries out deep peak shaving, and the combustion safety and stability under the low load of the boiler are the prerequisite. At present, the lowest operation load of most domestic coal-fired unit boilers is 40-50% of rated load, and a certain distance is reserved when the lowest deep regulation load required by a power grid reaches 30-35% of rated load. The coal quality characteristic of the boiler and the stable combustion performance of the combustor are key factors influencing the low-load stable combustion capability of the boiler. On the premise of certain coal quality, how to improve the stable combustion performance of the combustor becomes the focus of attention of combustor research and development personnel. In the eighties, the stable combustion performance of the coal-fired boiler burner is researched in China, and various burners such as a rich-lean burner, a blunt body burner and a precombustion chamber type burner are also developed. The pre-combustion chamber type combustor has better stable combustion performance compared with other types of combustors because pulverized coal is ignited in the pre-combustion chamber, and is more suitable for deep peak regulation of a boiler. However, due to the complexity and variability of coal quality and the continuous improvement of requirements of power plants on the combustion economy, environmental protection characteristics, peak regulation capability and the like of boilers, burner researchers are always perfecting and innovating the precombustion chamber type burner.
Application number is 201810737004.6's utility model patent discloses an ultralow NOX combustion system and combustor that low-load surely fires introduces the combustor precombustion behind flue gas and air mixing, when improving the steady fire of boiler low-load, has reduced combustion process NOXAnd (4) generating.
The utility model discloses an application number is 201810813198.3 utility model discloses a prechamber pulverized coal burner and combustion method catch fire in grades, through the arrangement of prechamber and combustor bluff body, combines the purpose of multistage whirl overgrate air, realizes improving the steady ability of firing of boiler low-load.
At present, the improvement of the stable combustion capacity of most of precombustion chamber type combustors is realized by enhancing combustion strengthening modes such as air-powder mixing temperature enhancement and high-temperature flue gas entrainment, and the like, although the stable combustion capacity under low load is improved, the phenomena of nozzle coking, burning loss and the like caused by overlarge heat load often influence the safe operation of a boiler when the high load is carried out. And for the change of coal quality and load, an effective combustion stability guarantee measure is lacked.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a steady combustion burner based on prechamber temperature control to the characteristics that the low-load steady combustion and the high load spout coking that easily exist in the running process of prechamber formula combustor, the scaling loss is difficult to compromise.
The utility model discloses a following technical scheme realizes:
a stable combustion burner based on precombustion chamber temperature control comprises a secondary air cyclone, a smoke temperature measuring device in the precombustion chamber, a primary air cyclone, a purging device, a secondary air pipeline, a pulverized coal pipeline, a central air pipeline, a micro-oil gun, a central air baffle and a secondary air cyclone pull rod; wherein the content of the first and second substances,
the micro-oil gun, the central air pipeline, the primary air cyclone, the pulverized coal pipeline, the secondary air cyclone and the secondary air pipeline are sequentially sleeved together from inside to outside, the precombustion chamber is arranged at the end part of the combustor close to the side of the hearth, the flue gas temperature measuring device in the precombustion chamber is arranged on the inner wall of the precombustion chamber, the purging device is arranged at the bottom of the precombustion chamber, and the secondary air cyclone pull rod is connected with the secondary air cyclone; the central air baffle is arranged at the central air inlet of the central air pipeline.
The utility model discloses further improvement lies in, little oil gun throw move back the aperture instruction of instruction, combustor center wind baffle, the measuring result of flue gas temperature measuring device in the precombustion chamber, the whirl intensity of overgrate air cyclone, fuel volume access control center, control center is used for according to the measuring result of flue gas temperature measuring device in the precombustion chamber, the increase and decrease of the whirl intensity and the fuel volume of throwing of control little oil gun move back, the aperture of combustor center wind baffle, overgrate air cyclone.
The utility model discloses further improvement lies in, and flue gas temperature measuring device takes embedded mode to arrange on the inner wall of precombustion chamber in the precombustion chamber.
The utility model discloses further improvement lies in, and the wind powder mixture that comes out from the coal pulverizer produces strong whirl through a wind cyclone and gets into burning in the precombustion chamber through the buggy pipeline.
The utility model discloses further improvement lies in, and the overgrate air divides two parts to get into furnace, and partly passes through central wind pipeline to the mode of direct current gets into and participates in the burning in the precombustion chamber, and another part passes through the overgrate air pipeline, and through the burning that the outdoor direct entering furnace of swirl intensity adjustable follow precombustion chamber participated in the later stage.
The utility model discloses a further improvement lies in, the little oil gun of combustor nestification is in central wind pipeline.
The utility model discloses at least, following profitable technological effect has:
the utility model provides a pair of steady combustion burner based on precombustion chamber temperature control through setting up the once-through wind whirl device at the precombustion chamber entry, makes the wind-powder mixture produce strong whirl before getting into the precombustion chamber burning, ensures the combustor low-load and surely fires the performance. The inlet of the precombustion chamber is provided with a direct-current central air duct, and the phenomena of coking, burning loss and the like of the precombustion chamber under high load can be avoided by adjusting the opening of the direct-current central air duct. The secondary air with adjustable swirl strength is arranged outside the cavity of the precombustion chamber, so that the mixing of air and powder airflow in the precombustion chamber is delayed, the generation of nitrogen oxides is reduced, and meanwhile, the low-load stable combustion performance and the anti-coking burning loss performance of the combustor can be improved in an auxiliary manner by adjusting the swirl strength of the secondary air.
The utility model provides a pair of steady combustion combustor based on precombustion chamber temperature control, during the operation, install the measuring device who measures the flue gas temperature in the precombustion chamber at the combustor precombustion chamber inner wall, the little oil device is installed to the nestification in a central section of thick bamboo, according to the difference of burning with the coal property characteristic, predetermine one and can ensure the temperature low limit value T that the buggy air current steadily burns in the precombustion chamberdAnd a temperature ceiling T that may cause coking and burnout of the burnergWhen the temperature value T measured by the temperature measuring device in the precombustion chambercBelow a high temperature limit TgAnd above the temperature threshold TdWhen the pulverized coal is stably combusted and is not combusted in the pre-combustion chamberIf the risk of coking and burning loss of the burner exists, the burner continues to maintain stable operation or gradually reduces the fuel quantity and performs peak shaving operation; when the temperature value T measured by the temperature measuring device in the precombustion chambercContinuously lower than a temperature lower limit value TdWhen the temperature value T is measured after the fuel quantity is increased and the pulverized coal airflow in the pre-combustion chamber is stably combusted, the temperature value T is measuredcContinuously above the temperature threshold TdWhen the oil is in a certain range, the micro-oil device is withdrawn; when the temperature value T measured by the temperature measuring device in the precombustion chambercContinuously above the temperature ceiling TgWhen the secondary air is burnt, the central air opening is opened immediately, the secondary air rotational flow is reduced, and the fuel quantity is reduced; the fire extinguishing risk caused by coal quality variation or load reduction in the low-load operation process of the boiler is effectively avoided, and the risk of coking and burning loss of the combustor of the pre-combustion chamber caused by high-load operation of the boiler or high coal quality volatile and heat value is reduced. In summary, the utility model has the following advantages:
1) the problems of low-load stable combustion and high-load coking and burning loss prevention of the precombustion chamber burner are fully considered, the structural design of the precombustion chamber type burner is optimized, the stable combustion and coking and burning loss prevention functional design and the operation optimization based on the monitoring of the temperature of the flue gas in the precombustion chamber are implemented simultaneously, the load of a boiler can be reduced to be below 20 percent of rated load on the basis of ensuring the combustion safety, and the risks of coking, burning loss and the like of a burner nozzle under high load are reduced simultaneously. Specifically, a measuring device for measuring the smoke temperature in the precombustion chamber is arranged on the inner wall of the precombustion chamber of the burner, a micro-oil device is nested in the central cylinder, the on-off of a micro-oil gun, the opening degree of central air, the fuel quantity, the swirl strength of secondary air and the like can be flexibly controlled according to the smoke temperature in the precombustion chamber, the low-load stable combustion of the boiler is ensured, and the coking and burning loss of a high-load burner are avoided.
2) Aiming at the characteristic that the coal quality of the domestic coal-fired unit is complex and changeable, the coal type adaptability of the pre-combustion chamber type combustor is fully expanded, the fuel cost of the deep peak shaving unit is reduced, and the running economy of the unit is improved.
Drawings
Fig. 1 shows a schematic structural diagram of the stable combustion burner of the present invention.
Description of reference numerals:
1-secondary air cyclone, 2-flue gas temperature measuring device in the precombustion chamber, 3-combustor precombustion chamber, 4-primary air cyclone, 5-purging device, 6-secondary air pipeline, 7-pulverized coal pipeline, 8-central air pipeline, 9-micro oil gun, 10-central air baffle and 11-secondary air cyclone pull rod.
FIG. 2 is a schematic diagram of the operation of a stable combustion burner based on prechamber temperature control.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a pair of steady combustion combustor based on prechamber temperature control, including secondary air cyclone 1, the interior flue gas temperature measuring device of prechamber 2, prechamber 3, wind cyclone 4 once, sweep device 5, secondary air pipeline 6, buggy pipeline 7, central wind pipeline 8, tiny-oil gun 9, central wind baffle 10 and secondary wind whirl pull rod 11. Micro-oil gun 9, central air duct 8, primary air cyclone 4, pulverized coal duct 7, secondary air cyclone 1, secondary air duct 6 suit from inside to outside in proper order on the same axis, and precombustion chamber 3 is arranged at the tip that the combustor is close to the furnace side, and flue gas temperature measuring device 2 takes embedded mode to arrange on the inner wall of precombustion chamber 3 in the precombustion chamber, and blowing device 5 is in the bottom of precombustion chamber 3, and secondary air cyclone pull rod 11 is connected with secondary air cyclone 1. The air-powder mixture from the coal mill passes through a coal-powder pipeline 7 and generates strong rotational flow through a primary air cyclone 4 to enter the precombustion chamber 3 for combustion. The secondary air is divided into two parts to enter the hearth, one part enters the precombustion chamber 3 in a direct-flow mode through the central air pipeline 8 to participate in combustion, and the other part directly enters the hearth from the outside of the precombustion chamber 3 through the secondary air cyclone 1 with adjustable swirl strength through the secondary air pipeline 6 to participate in later combustion. The burner tiny-oil gun 9 is nested in the central air duct 8. The switching instruction of the micro oil gun 9, the opening instruction of the central air baffle 10 of the burner, the measurement result of the flue gas temperature measurement device 2 in the precombustion chamber, the swirl strength of the secondary air swirler 1, the fuel quantity and the like are directly connected to a control center (as shown in figure 2), and the control center can control the switching of the micro oil gun 9, the opening of the central air baffle 10 of the burner, the swirl strength of the secondary air swirler 1 and the increase and decrease of the fuel quantity according to the measurement result of the flue gas temperature measurement device 2 in the precombustion chamber.
The utility model provides a pair of steady combustion burner's operation method based on prechamber temperature control, when boiler load is less than 40% rated load, prechamber formula combustor gets into the steady mode of firing of low-load, closes combustor center wind baffle 10 in advance to be 0%, adjusts the swirl strength of overgrate air swirler 1 to more than 60%. Presetting a temperature low limit value T capable of ensuring stable combustion of pulverized coal airflow in the pre-combustion chamberdAnd a temperature ceiling T that may cause coking and burnout of the burnerg. When the temperature value T measured by the flue gas temperature measuring device 2 in the precombustion chambercBelow a high temperature limit TgAnd above the temperature threshold TdWhen the coal powder in the pre-combustion chamber 3 is stably combusted and the risk of coking and burning loss of a combustor is avoided, the stable operation is continuously maintained or the fuel quantity peak shaving operation is gradually reduced; when the temperature value T measured by the flue gas temperature measuring device 2 in the precombustion chambercContinuously lower than a temperature lower limit value TdAnd when the time reaches three seconds or more, the coal powder in the precombustion chamber 3 is unstable in combustion and has fire extinguishing risk, the micro-oil gun 9 is immediately thrown into the precombustion chamber to support combustion and increase the fuel quantity, the opening degree of the central air baffle 10 is adjusted to be more than 50%, oil combustion is assisted, and the stable combustion is ensured. After the fuel quantity is increased, the pulverized coal in the precombustion chamber 3 is stably combusted, and the temperature value T measured by the smoke temperature measuring device 2 in the precombustion chambercContinuously above the temperature threshold TdAnd (3) when the temperature is more than 50 ℃ for ten minutes or more, the micro oil gun 9 is withdrawn, and the opening degree of the central air baffle 10 is closed to 0 percent.
When the boiler load is higher than 70% of rated load, the pre-combustion chamber type combustor enters into an anti-coking burning loss mode, the opening degree of a central air baffle 10 of the combustor is opened to 50% in advance, and the rotational flow strength of the secondary air cyclone 1 is adjusted to be below 40%. When the temperature value T measured by the flue gas temperature measuring device 2 in the precombustion chambercBelow the upper limit of temperatureValue TgAnd above the temperature threshold TdWhen the coal powder in the pre-combustion chamber 3 is stably combusted and the risk of coking and burning loss of a combustor is avoided, the stable operation is continuously maintained or the operation of increasing and decreasing the fuel quantity is continuously carried out; when the temperature value T measured by the flue gas temperature measuring device 2 in the precombustion chambercContinuously above the temperature ceiling TgWhen the time reaches 10 seconds, which indicates that the prechamber 3 has the risk of coking and burning loss, the opening of the central air baffle 10 is immediately opened to 100 percent, the rotational flow strength of the secondary air cyclone 1 is adjusted to 0 percent, the fuel quantity is reduced, and the operation safety of the combustor is ensured.
Further, the flue gas temperature measuring device 2 in the precombustion chamber is arranged on the circumferential section of one third of the axial distance of the nozzle of the precombustion chamber 3, three temperature measuring points are uniformly arranged in the circumferential direction, and the measured value is the average value of the three temperature measuring points.
Further, when the pre-combustion chamber type combustor is used for a front-wall and rear-wall opposed combustion boiler, the flow guiding expansion cone of the swirling secondary air at the nozzle of the combustor is 25 degrees.
Further, when the pre-combustion chamber type combustor is used for a tangential firing boiler, the diversion expansion cone of the swirling secondary air at the nozzle of the combustor is 0 degree and is parallel to the shell of the pre-combustion chamber cavity.
Furthermore, the micro oil gun 9 is controlled to be thrown and retreated, the opening degree of the central air baffle 10 is controlled, the fuel quantity is controlled, the secondary air cyclone 1 is controlled and the like according to the temperature value measured by the flue gas temperature measuring device 2 in the precombustion chamber, and the micro oil gun can be automatically controlled in a closed loop mode and can also be automatically adjusted by an operator of a power plant according to a recommended instruction.
Further, a preset high limit value T of the smoke temperature in the precombustion chambergThe selection is mainly carried out according to the ash melting point temperature of the coal for combustion in the weak reducing atmosphere and the allowable temperature of the metal material of the combustor of the pre-combustion chamber and considering a certain safety margin.
Further, a preset lower limit value T of the smoke temperature in the precombustion chamberdThe method is mainly selected according to the ignition temperature of the coal for combustion and in consideration of a certain safety margin.
The above description is provided for the purpose of describing the present invention in more detail with reference to the specific preferred embodiments, and it should not be construed that the present invention is limited thereto, and it will be apparent to those skilled in the art that the present invention can be implemented in various forms without departing from the spirit and scope of the present invention.
Claims (6)
1. A stable combustion burner based on precombustion chamber temperature control is characterized by comprising a secondary air cyclone (1), a smoke temperature measuring device (2) in the precombustion chamber, a precombustion chamber (3), a primary air cyclone (4), a purging device (5), a secondary air pipeline (6), a pulverized coal pipeline (7), a central air pipeline (8), a micro-oil gun (9), a central air baffle (10) and a secondary air cyclone pull rod (11); wherein the content of the first and second substances,
the micro-oil gun (9), the central air pipeline (8), the primary air cyclone (4), the pulverized coal pipeline (7), the secondary air cyclone (1) and the secondary air pipeline (6) are sequentially sleeved together from inside to outside, the pre-combustion chamber (3) is arranged at the end part of the combustor close to the side of a hearth, the flue gas temperature measuring device (2) in the pre-combustion chamber is arranged on the inner wall of the pre-combustion chamber (3), the purging device (5) is arranged at the bottom of the pre-combustion chamber (3), and the secondary air cyclone pull rod (11) is connected with the secondary air cyclone (1); the central air baffle (10) is arranged at the central air inlet of the central air duct (8).
2. The stable combustion burner based on the precombustion chamber temperature control as claimed in claim 1, characterized in that the micro oil gun (9) is switched on and off, the burner central air baffle (10) is opened, the measurement result of the flue gas temperature measurement device (2) in the precombustion chamber, the swirl strength of the secondary air swirler (1), and the fuel quantity are switched into the control center, and the control center is used for controlling the micro oil gun (9) to be switched on and off, the burner central air baffle (10) is opened, the swirl strength of the secondary air swirler (1) and the increase and decrease of the fuel quantity according to the measurement result of the flue gas temperature measurement device (2) in the precombustion chamber.
3. A stable combustion burner based on prechamber temperature control according to claim 1, characterized in that the measuring device (2) for the flue gas temperature in the prechamber is arranged in an embedded manner on the inner wall of the prechamber (3).
4. The burner of claim 1, wherein the air-powder mixture from the coal mill passes through the pulverized coal pipe (7) and is swirled strongly by the primary air swirler (4) to enter the pre-combustion chamber (3) for combustion.
5. The stable combustion burner based on the temperature control of the precombustion chamber is characterized in that the secondary air enters the hearth in two parts, one part enters the precombustion chamber (3) in a direct flow mode through the central air pipeline (8) to participate in combustion, and the other part directly enters the hearth from the outside of the precombustion chamber (3) through the secondary air pipeline (6) through the secondary air cyclone (1) with adjustable swirl strength to participate in later combustion.
6. A stable combustion burner based on prechamber temperature control according to claim 1, characterized in that the burner oil lance (9) is nested inside the central air duct (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022172033.8U CN212565753U (en) | 2020-09-28 | 2020-09-28 | Stable combustion burner based on temperature control of precombustion chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022172033.8U CN212565753U (en) | 2020-09-28 | 2020-09-28 | Stable combustion burner based on temperature control of precombustion chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212565753U true CN212565753U (en) | 2021-02-19 |
Family
ID=74622672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022172033.8U Active CN212565753U (en) | 2020-09-28 | 2020-09-28 | Stable combustion burner based on temperature control of precombustion chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212565753U (en) |
-
2020
- 2020-09-28 CN CN202022172033.8U patent/CN212565753U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101725969B (en) | Low-NOx pulverized coal burner | |
| CN112032711A (en) | Stable combustion burner based on temperature control of precombustion chamber and operation method thereof | |
| CN201680364U (en) | Efficient low NOx pulverized coal burner for small and medium-sized industrial boilers | |
| CN203099814U (en) | Pulverized coal burner | |
| CN202660534U (en) | Low-NOX fluid slagging pulverized coal combusting device with tertiary swirl air | |
| WO2015103831A1 (en) | Fuel/gas-saving ignition and stable-combustion low-nitrogen swirling pulverized coal combustor | |
| CN111750346A (en) | Combustor system suitable for degree of depth peak regulation | |
| CN201606876U (en) | Low-NOx coal burner | |
| CN112460594A (en) | Double-fuel burner and boiler with graded ignition and graded air distribution and smoke recirculation | |
| CN105202575A (en) | Ignition method and device through high-temperature high oxygen torch generated by coal powder or crushed coal combustion | |
| CN205119048U (en) | Bitonic wind vortex burner | |
| CN212565753U (en) | Stable combustion burner based on temperature control of precombustion chamber | |
| CN208418734U (en) | A kind of low-NOx combustor for natural gas and coal dust | |
| CN215174993U (en) | Air quantity and rotational flow double-regulation burner | |
| CN206600793U (en) | A kind of coal-burning power plant's turbulent burner suitable for Blended Coal Combustion | |
| CN105402723A (en) | Coal-fired power plant turbulent burner suitable for low-order mixed coal combustion | |
| CN214840783U (en) | Concentrated type double-air-regulation rotational flow low-nitrogen combustor provided with central air | |
| CN205119049U (en) | Bitonic wind vortex burner | |
| CN214370150U (en) | Plasma ignition self-sustaining stable-combustion low-nitrogen combustion device | |
| CN201496958U (en) | W-flame cyclone separation low-oil ignition burner | |
| CN114877322A (en) | Flame regulation formula cyclone burner | |
| CN210601599U (en) | Adjustable staged ignition burner suitable for solid fuel | |
| CN211011344U (en) | Cylinder type pulverized coal burner | |
| CN210050797U (en) | Pollutant ultra-low discharge cyclone pulverized coal burner | |
| CN210601622U (en) | Adjustable staged ignition burner suitable for gas fuel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |