CN112032711A - Stable combustion burner based on temperature control of precombustion chamber and operation method thereof - Google Patents
Stable combustion burner based on temperature control of precombustion chamber and operation method thereof Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D1/00—Burners for combustion of pulverulent fuel
- F23D1/02—Vortex burners, e.g. for cyclone-type combustion apparatus
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- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
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Abstract
The invention discloses a stable combustion burner based on temperature control of a precombustion chamber and an operation method thereof. 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 invention can effectively improve the deep peak regulation capability of the coal-fired boiler and broaden the coal quality adaptability of the deep peak regulation unit.
Description
Technical Field
The invention belongs to the technical field of deep peak shaving of a coal-fired power station boiler, and particularly relates to a stable-combustion combustor based on temperature control of a precombustion chamber and an operation method thereof.
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.
The invention patent with the application number of 201810737004.6 discloses an ultralow NOX combustion system with low load and stable combustion and a combustor thereof, wherein flue gas and air are mixed and then introduced into a combustor precombustion chamber for combustion, so that the low load and stable combustion of a boiler are improved, and NO in the combustion process is reducedXAnd (4) generating.
The invention patent with application number 201810813198.3 discloses a staged ignition precombustion chamber pulverized coal burner and a burning method, which realize the purpose of improving the low-load stable burning capability of a boiler by the arrangement of a precombustion chamber and a burner bluff body and the combination of multi-stage rotational flow secondary air.
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.
Disclosure of Invention
The invention aims to provide a stable combustion combustor based on prechamber temperature control and an operation method thereof, aiming at the characteristics of low-load stable combustion, high-load nozzle coking and burning loss which are easy to occur in the operation process of a prechamber type combustor.
The invention is realized by adopting the following technical scheme:
a stable combustion burner based on precombustion chamber temperature control comprises a secondary air cyclone, a precombustion chamber temperature measuring device, a 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 a central air inlet of the central air pipeline;
the control center is used for controlling the throwing and withdrawing of the micro oil gun, the opening degree of the air baffle at the center of the combustor, the rotational flow strength of the secondary air cyclone and the increase and decrease of the fuel quantity according to the measurement result of the flue gas temperature measurement device in the pre-combustion chamber.
The invention is further improved in that the flue gas temperature measuring device in the precombustion chamber is arranged on the inner wall of the precombustion chamber in an embedded mode.
The invention is further improved in that the air-powder mixture from the coal mill passes through the coal powder pipeline and generates strong rotational flow through the primary air cyclone to enter the precombustion chamber for combustion.
The invention has the further improvement that the secondary air is divided into two parts to enter the hearth, one part enters the pre-combustion chamber to participate in combustion in a direct flow mode through the central air pipeline, and the other part directly enters the hearth from the outside of the pre-combustion chamber to participate in later combustion through the secondary air cyclone with adjustable swirl strength through the secondary air pipeline.
The invention is further improved in that the burner micro-oil gun is nested in the central air duct.
When the load of a boiler is lower than 40% of rated load, the prechamber type burner enters a low-load stable combustion mode, the central air opening of the burner is closed to be 0% in advance, and the secondary air swirl strength is adjusted to be more than 60%; when 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 coal powder 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 temperature measuring device in the precombustion chambercContinuously lower than a temperature lower limit value TdWhen the time reaches three seconds or more, the coal powder in the pre-combustion chamber is unstable in combustion and has fire extinguishing risk, the micro-oil device is immediately put into the pre-combustion chamber to support combustion and increase the fuel quantity, the opening of central air is adjusted to be more than 50%, oil is assisted to be combusted, and the stable combustion is ensured; after the fuel quantity is increased, the pulverized coal in the precombustion chamber is stably combusted, and the temperature value T measured by the temperature measuring device in the precombustion chambercContinuously above the temperature threshold TdWhen the temperature is more than 50 ℃ and reaches ten minutes or more, the micro-oil combustion-supporting device is withdrawn, and the opening degree of the central air is closed to 0 percent;
when the load of the boiler is higher than 70% of rated load, the pre-combustion chamber type combustor enters into an anti-coking burning loss mode, the central air opening of the combustor is opened to 50% in advance, and the secondary air swirling strength is adjusted to be below 40%; when 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 coal powder 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 is increased or decreased; when the temperature value T measured by the temperature measuring device in the precombustion chambercContinuously above the temperature ceiling TgWhen the time reaches 10 seconds, the risk of coking and burning loss of the combustor in the precombustion chamber is indicated, the opening degree of the central air is immediately opened to 100%, the intensity of the secondary air swirl is adjusted to 0%, the fuel quantity is reduced, and the operation safety of the combustor is ensured.
The invention has the further improvement that the flue gas temperature measuring device in the precombustion chamber is arranged on the circumferential section of one third of the axial distance from the nozzle in the precombustion chamber, 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.
The invention has the further improvement that when the pre-combustion chamber type combustor is used for a front-wall and rear-wall opposed combustion boiler, the guide expansion cone of the swirling secondary air at the nozzle of the combustor is 25 degrees;
when the precombustion chamber type burner is used for a tangential firing boiler, the diversion cone of the rotational flow secondary air at the nozzle of the burner is 0 degree and is parallel to the precombustion chamber cavity shell.
The invention is further improved in that the investment of the micro-oil device, the adjustment of the central air opening, the adjustment of the fuel quantity and the adjustment of the secondary air rotational flow are controlled according to the measured value of the flue gas temperature in the precombustion chamber, and the micro-oil device is automatically controlled in a closed loop mode or is automatically adjusted by an operator of a power plant according to a recommended instruction.
The invention is further improved in that the high limit value T of the smoke temperature in the precombustion chambergSelecting 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 allowance;
lower limit value T of smoke temperature in precombustion chamberdAnd selecting according to the ignition temperature of the coal for combustion and considering a certain safety margin.
The invention has at least the following beneficial technical effects:
according to the stable combustion burner based on the temperature control of the precombustion chamber, the primary air swirling device is arranged at the inlet of the precombustion chamber, so that an air-powder mixture generates strong swirling flow before entering the precombustion chamber for combustion, and the low-load stable combustion performance of the burner is ensured. 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 invention provides an operation method of a stable combustion burner based on temperature control of a precombustion chamber, which is characterized in that a measuring device for measuring the temperature of smoke in the precombustion chamber is arranged on the inner wall of the precombustion chamber of the burner, a micro-oil device is nested in a central cylinder, and a temperature low limit value T capable of ensuring stable combustion of pulverized coal airflow in the precombustion chamber is preset according to different characteristics of coal for combustiondAnd 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 coal powder 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 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 present invention 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-precombustion chamber temperature measuring device, 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 stable combustion burner based on prechamber temperature control provided by the invention comprises a secondary air cyclone 1, a prechamber temperature measuring device 2, a prechamber 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. 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 2 with adjustable swirl strength to participate in later combustion through the secondary air pipeline 6. 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 invention provides an operation method of a stable combustion burner based on prechamber temperature control, when the boiler load is lower than 40% of rated load, the prechamber type burner enters a low-load stable combustion mode, a central air baffle 10 of the burner is closed to be 0% in advance, and the swirl strength of a secondary air swirler 1 is adjusted to be 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 temperature measuring device 2 in the precombustion chamber 3cBelow 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 temperature measuring device 2 in the precombustion chamber 3cContinuously 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 coal in the precombustion chamber 3The powder combustion is stable, and the temperature value T measured by the temperature measuring device 2 in the precombustion chamber 3cContinuously 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 temperature measuring device 2 in the precombustion chamber 3cBelow 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 operation of increasing and decreasing the fuel quantity is continuously carried out; when the temperature value T measured by the temperature measuring device 2 in the precombustion chamber 3cContinuously 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 pre-combustionHigh limit value T of indoor smoke temperaturegThe 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.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A stable combustion burner based on precombustion chamber temperature control is characterized by comprising a secondary air cyclone (1), a precombustion chamber temperature measuring device (2), 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 pipeline (8);
the control system comprises a switching instruction of the micro oil gun (9), an opening instruction of a central air baffle (10) of the combustor, a measurement result of a flue gas temperature measurement device (2) in the pre-combustion chamber, the rotational flow strength of a secondary air cyclone (1) and fuel quantity, and is connected to a control center, wherein the control center is used for controlling switching of the micro oil gun (9), the opening of the central air baffle (10) of the combustor, the rotational flow strength of the secondary air cyclone (1) and increase and decrease of the fuel quantity according to the measurement result of the flue gas temperature measurement device (2) in the pre-combustion chamber.
2. 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).
3. 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.
4. 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 (2) with adjustable swirl strength to participate in later combustion.
5. 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).
6. A running method of a stable combustion burner based on prechamber temperature control is characterized in that when the boiler load is lower than 40% of rated load, the prechamber type burner enters a low-load stable combustion mode, the central air opening of the burner is closed to 0% in advance, and the secondary air swirl strength is adjusted to be more than 60%; when 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 in the pre-combustion chamber is stably combusted and the risk of coking and burning loss of the combustor is avoided, the stable operation is continuously maintained or the combustion is gradually reducedCarrying out material quantity peak regulation 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 time reaches three seconds or more, the coal powder in the pre-combustion chamber is unstable in combustion and has fire extinguishing risk, the micro-oil device is immediately put into the pre-combustion chamber to support combustion and increase the fuel quantity, the opening of central air is adjusted to be more than 50%, oil is assisted to be combusted, and the stable combustion is ensured; after the fuel quantity is increased, the pulverized coal in the precombustion chamber is stably combusted, and the temperature value T measured by the temperature measuring device in the precombustion chambercContinuously above the temperature threshold TdWhen the temperature is more than 50 ℃ and reaches ten minutes or more, the micro-oil combustion-supporting device is withdrawn, and the opening degree of the central air is closed to 0 percent;
when the load of the boiler is higher than 70% of rated load, the pre-combustion chamber type combustor enters into an anti-coking burning loss mode, the central air opening of the combustor is opened to 50% in advance, and the secondary air swirling strength is adjusted to be below 40%; when 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 coal powder 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 is increased or decreased; when the temperature value T measured by the temperature measuring device in the precombustion chambercContinuously above the temperature ceiling TgWhen the time reaches 10 seconds, the risk of coking and burning loss of the combustor in the precombustion chamber is indicated, the opening degree of the central air is immediately opened to 100%, the intensity of the secondary air swirl is adjusted to 0%, the fuel quantity is reduced, and the operation safety of the combustor is ensured.
7. The operation method of the stable combustion burner based on the temperature control of the precombustion chamber is characterized in that a smoke temperature measuring device in the precombustion chamber is arranged on a circumferential section of one third of the axial distance of the precombustion chamber from a nozzle, 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.
8. The operation method of the stable combustion burner based on the temperature control of the precombustion chamber is characterized in that when the precombustion chamber type burner is used for a front-wall and rear-wall opposed firing boiler, the diversion cone expansion of the swirling secondary air at the nozzle of the burner is 25 degrees;
when the precombustion chamber type burner is used for a tangential firing boiler, the diversion cone of the rotational flow secondary air at the nozzle of the burner is 0 degree and is parallel to the precombustion chamber cavity shell.
9. The operation method of the stable combustion burner based on the temperature control of the precombustion chamber is characterized in that the investment of the micro-oil device, the adjustment of the central air opening, the adjustment of the fuel quantity and the adjustment of the secondary air rotational flow are controlled according to the measured value of the flue gas temperature in the precombustion chamber, and are automatically controlled in a closed loop mode or automatically adjusted by a power plant operator according to recommended instructions.
10. The operation method of the stable-combustion burner based on the temperature control of the precombustion chamber is characterized in that the high limit value T of the flue gas temperature in the precombustion chamber is set as the TgSelecting 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 allowance;
lower limit value T of smoke temperature in precombustion chamberdAnd selecting according to the ignition temperature of the coal for combustion and considering a certain safety margin.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112163383A (en) * | 2020-10-12 | 2021-01-01 | 江苏方天电力技术有限公司 | Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction |
| CN112594680A (en) * | 2020-12-16 | 2021-04-02 | 华能海南发电股份有限公司东方电厂 | Integrated primary air pipe system for preventing burning loss of cyclone pulverized coal burner |
| CN113483334A (en) * | 2021-07-08 | 2021-10-08 | 陕西青朗万城环保科技有限公司 | Method and device for enhancing combustion of solid particles by microwaves |
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2020
- 2020-09-28 CN CN202011043520.2A patent/CN112032711A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112163383A (en) * | 2020-10-12 | 2021-01-01 | 江苏方天电力技术有限公司 | Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction |
| CN112163383B (en) * | 2020-10-12 | 2022-05-27 | 江苏方天电力技术有限公司 | Coal-fired boiler minimum deep regulation load evaluation method considering coal type and environmental parameter correction |
| CN112594680A (en) * | 2020-12-16 | 2021-04-02 | 华能海南发电股份有限公司东方电厂 | Integrated primary air pipe system for preventing burning loss of cyclone pulverized coal burner |
| CN112594680B (en) * | 2020-12-16 | 2022-12-20 | 华能海南发电股份有限公司东方电厂 | Integrated primary air pipe system for preventing burning loss of cyclone pulverized coal burner |
| CN113483334A (en) * | 2021-07-08 | 2021-10-08 | 陕西青朗万城环保科技有限公司 | Method and device for enhancing combustion of solid particles by microwaves |
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