CN215372450U - Liquid slag-discharging cyclone burner with interlayer cyclone secondary air - Google Patents
Liquid slag-discharging cyclone burner with interlayer cyclone secondary air Download PDFInfo
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- CN215372450U CN215372450U CN202120312228.XU CN202120312228U CN215372450U CN 215372450 U CN215372450 U CN 215372450U CN 202120312228 U CN202120312228 U CN 202120312228U CN 215372450 U CN215372450 U CN 215372450U
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Abstract
The utility model discloses a slag tapping cyclone burner with interlayer cyclone secondary air, which is characterized by comprising a burner cylinder, wherein the inside of the burner cylinder is provided with an in-cylinder combustion space, the cylinder is provided with a main secondary air inlet channel and an interlayer secondary air annular channel, one end of the burner cylinder is connected with a cyclone burner, and the other end of the burner cylinder is connected with a tail combustion chamber; the primary secondary air inlet channel is communicated to the in-cylinder combustion space, and the interlayer secondary air annular channel is communicated to the tail combustion chamber; and the secondary air rotating directions of the main secondary air inlet channel and the interlayer secondary air annular channel are consistent.
Description
Technical Field
The utility model relates to a liquid slag-discharging cyclone burner with interlayer cyclone secondary air, belonging to the technical field of power station boiler combustion.
Background
The reserves of the Xinjiang high-alkali coal in China are huge, but the problems of serious slagging and contamination of the boiler caused by the high contents of alkali metals such as Na, K and the like and alkaline earth metals in the coal influence the long-term, safe and reliable operation of the boiler, thereby limiting the development and utilization of the high-alkali coal as power coal. The combustion technology of liquid slag-off boiler is a combustion technology with high combustion intensity, high slag-catching rate and less dust content in flue gas, it can overcome the defects of slag-bonding on the water-cooled wall of furnace cavity, serious contamination/dust deposition/slag bonding of heated surface, etc. when the easy-to-slag coal is used for solid slag-off boiler, and is especially suitable for low-volatile component, low-ash melting point coal and coal with moderate ash content. The Sinkiang high-alkali coal is combusted by adopting the combustion technology of the liquid slag-discharging boiler, so that on one hand, the slag trapping rate in the boiler can be greatly improved, and the dust concentration of the flue gas at the outlet of the hearth can be reduced; on the other hand, through high-temperature combustion of coal in the cyclone burner, Na, K, Ca and Fe low-melting minerals in the coal ash are melted and discharged from the bottom of the boiler, so that the content of the low-melting minerals in flue gas fly ash entering a heating surface at the tail part of the boiler is greatly reduced, and the method is an effective way for solving the problem that the heating surface of a hearth of the high-alkali coal fired boiler for the existing power station boiler is seriously slagging and contaminated.
In the cyclone furnace, the primary air-wrapped pulverized coal airflow forms strong rotational flow in the cyclone cylinder under the driving of tangentially introduced secondary air, so that pulverized coal particles are thrown onto a glowing slag film on the inner wall of the cylinder, the pulverized coal is ignited and combusted in the cylinder, and most high-temperature slag generated in the combustion process is thrown to the wall of the cylinder under the action of centrifugal force to form a slag film and is discharged. Because the processes of coal powder combustion, slagging and slag discharging are mainly completed in the cyclone burner, the design of the cyclone burner has great influence on the slag capturing rate and the alkali metal capturing rate. Generally, the rotation and advancing speed of pulverized coal airflow in a cyclone furnace are gradually reduced along with the development of flame stroke, a high swirl strength cannot be maintained in a tail combustion chamber, and the slag catching effect is weakened; in addition, at the same time, the high temperature in the cyclone burner is also a factor of high NOx production.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problems that the rotation and advancing speed of pulverized coal airflow in a cyclone furnace in the prior art are gradually reduced along with the development of flame stroke, a high swirl strength cannot be maintained in a tail combustion chamber, and the slag catching effect is weakened; and the high temperature in the cyclone burner results in high NOx production.
In order to solve the technical problems, the technical scheme of the utility model is to provide a slag tapping cyclone burner with interlayer cyclone secondary air, which is characterized by comprising a burner cylinder, wherein the inside of the burner cylinder is provided with an in-cylinder combustion space, the cylinder is provided with a main secondary air inlet channel and an interlayer secondary air annular channel, one end of the burner cylinder is connected with the cyclone burner, and the other end of the burner cylinder is connected with a tail combustion chamber; the primary secondary air inlet channel is communicated to the in-cylinder combustion space, and the interlayer secondary air annular channel is communicated to the tail combustion chamber; and the secondary air rotating directions of the main secondary air inlet channel and the interlayer secondary air annular channel are consistent.
Preferably, the flue gas outlet of the combustor cylinder is arranged at one end of the tail combustion chamber.
Preferably, the air inlet direction of the main secondary air inlet channel is the tangential direction of the cylinder.
Preferably, the fuel of the cyclone burner is solid fuel, and primary air containing solid fuel particles enters the in-barrel combustion space through the cyclone burner to be combusted.
Preferably, the air volume of the interlayer secondary air annular channel is 10-25% of the total air volume required by the combustion of the solid fuel.
Further, the axial speed of the interlayer secondary air at the outlet of the interlayer secondary air is not lower than 30 m/s.
Further, the ratio of the tangential velocity to the axial velocity of the interlayer secondary air at the outlet thereof is within the range of 1:2 to 2: 1.
Further, the interlayer secondary air is independently introduced or directly introduced from a main secondary air inlet channel.
Preferably, the tail combustion chamber is internally provided with a SOFA wind nozzle.
The slagging-off cyclone burner with interlayer cyclone secondary air provided by the utility model has the advantages that the annular channel of the secondary air is arranged in the interlayer of the cylinder body of the cyclone burner, part of the secondary air is introduced from the annular channel of the interlayer and rotates along the axial direction of the cylinder body, and is mixed with solid fuel particle airflow in a tail combustion chamber, so that the aims of improving the cyclone strength of the solid fuel particle airflow, improving the flow field of the solid fuel particle airflow in a furnace, strengthening the combustion stability of the fuel in the furnace, reducing the temperature of the outer surface of a heat-insulating cyclone cylinder, reducing the discharge of nitrogen oxides, reducing the manufacturing cost of the cyclone burner and the like are fulfilled.
The liquid slag-off cyclone burner with interlayer cyclone secondary air provided by the utility model adopts the technical scheme that a part of secondary air rotating along the axial direction of a cylinder is introduced into an interlayer of the cylinder, and is mixed with solid fuel particle airflow in a tail combustion chamber, so that the loss of cyclone strength caused by the movement of the solid fuel particle airflow along a cyclone cylinder can be compensated, a strong backflow area is formed in the tail combustion chamber, the flow field of the solid fuel particle airflow in a furnace is effectively improved, the stable combustion and the burnout of fuel and the wall throwing effect of liquid slag drops are enhanced, in addition, the graded combustion is formed in the cylinder of the cyclone burner due to the graded feeding of the secondary air, and the stable liquid slag film is formed on the inner wall of the cyclone burner by the fuel, and the emission of NOx is reduced.
The interlayer secondary air annular channel provided by the utility model is arranged in the interlayer of the barrel, the low-temperature interlayer secondary air can absorb part of the heat dissipation capacity of the wall of the cyclone barrel, the temperature of the outer surface of the cyclone barrel is reduced, the heat dissipation loss of the liquid-state deslagging cyclone burner is reduced, the allowable temperature of a refractory heat-insulating material of the barrel is reduced, and the weight of the liquid-state deslagging cyclone burner body is reduced. Meanwhile, the temperature of the secondary air of the interlayer is increased after the secondary air is heated, so that the quick and full combustion of fuel is more facilitated, and certain economical efficiency is achieved while the heat efficiency of the cyclone furnace is ensured.
The secondary air is divided into the main secondary air and the interlayer secondary air and is introduced into different combustion areas, so that air classification is realized. Rich fuel-oxygen-poor combustion is formed in the combustor cylinder body, and lean fuel-oxygen-rich combustion is formed in the tail combustion chamber, so that the generation amount of nitrogen oxide in the combustion process of fuel in the furnace can be effectively reduced.
Drawings
FIG. 1 is a schematic view of a slagging-off cyclone burner with an interlayer cyclone secondary air according to the present invention;
in the figure: 1-a cyclone burner; 2-primary secondary air inlet channel; 3-a combustor can; 4-interlayer secondary air annular channel; 5-an in-barrel combustion space; 6-tail combustion chamber.
Detailed Description
In order to make the utility model more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings.
Examples
The slag tapping cyclone burner with the interlayer cyclone secondary air comprises a cyclone burner 1, a main secondary air inlet channel 2, a burner barrel 3, an interlayer secondary air annular channel 4 and an in-barrel combustion space 5.
The top of the cylinder 3 is provided with a cyclone burner 1, the cyclone burner 1 burns solid fuel, and the flue gas outlet of the slagging cyclone burner is positioned at the bottom of the burner cylinder 3; primary air and solid fuel particles are introduced into the cyclone burner 1; the secondary air comprises primary secondary air and interlayer secondary air, a primary secondary air inlet channel 2 is arranged at the upper part of the cylinder 3 along the tangential direction of the cylinder, an interlayer secondary air annular channel 4 is arranged at a proper height of the cylinder 3, the interlayer secondary air keeps rotating at a high speed, the rotating direction of the interlayer secondary air is consistent with that of the primary secondary air, and an outlet of the interlayer secondary air annular channel 4 is positioned at the bottom of the combustor cylinder 3; the material of the combustor cylinder 3 has the functions of fire resistance and heat preservation; the combustor basket 3 is connected to an afterburner 6.
The mixture of primary air and solid fuel is subjected to swirl mixing and ignition through the swirl burner 1, secondary air is divided into two parts which are respectively introduced from the main secondary air inlet channel 2 and the interlayer secondary air annular channel 4 to participate in swirl sectional combustion of the fuel, the solid fuel particle airflow always keeps higher swirl strength in the combustion process, and the fuel is completely combusted in the tail combustion chamber 6.
Wherein, the air volume of the interlayer secondary air is 15% of the total air volume required by the combustion of the solid fuel; the axial speed of the interlayer secondary air at the outlet of the interlayer secondary air is 45 m/s; the ratio of the tangential speed and the axial speed of the interlayer secondary air at the outlet of the interlayer secondary air is 1: 1; interlayer secondary air is independently introduced from the main secondary air inlet channel; the tail combustion chamber is provided with SOFA wind nozzles (overfire wind nozzles).
In the slagging-off cyclone burner with the interlayer cyclone secondary air, part of secondary air rotating along the axial direction of the cylinder is introduced into the interlayer of the cylinder, the secondary air is mixed with solid fuel particle airflow in a tail combustion chamber, the loss of cyclone strength caused by the movement of the solid fuel particle airflow along the cyclone cylinder can be compensated, a strong backflow area is formed in the tail combustion chamber, the airflow field of the solid fuel particle airflow in the furnace is effectively improved, the stable combustion and the burnout of fuel and the wall throwing effect of liquid slag drops are enhanced, in addition, due to the graded feeding of the secondary air, the graded combustion is formed in the cyclone burner cylinder, and the discharge of NOx is reduced while the stable liquid slag film is formed on the inner wall of the cyclone burner by the fuel.
The annular channel of the interlayer secondary air is arranged in the interlayer of the barrel, the secondary air of the low-temperature interlayer can absorb part of heat dissipation capacity of the wall of the cyclone barrel, the temperature of the outer surface of the cyclone barrel is reduced, the heat dissipation loss of the liquid-state deslagging cyclone burner is reduced, the allowable temperature of a refractory heat-insulating material of the barrel is reduced, and the weight of the liquid-state deslagging cyclone burner body is reduced. Meanwhile, the temperature of the secondary air of the interlayer is increased after the secondary air is heated, so that the quick and full combustion of fuel is more facilitated, and certain economical efficiency is achieved while the heat efficiency of the cyclone furnace is ensured.
In the embodiment, the secondary air is divided into the main secondary air and the interlayer secondary air and is introduced into different combustion areas, so that air classification is realized, rich fuel-lean oxygen combustion is formed in the cyclone cylinder, and lean fuel-rich oxygen combustion is formed in the tail combustion chamber, and the generation amount of nitrogen oxides in the combustion process of the fuel in the furnace can be effectively reduced.
Claims (9)
1. The slagging cyclone burner with the interlayer cyclone secondary air is characterized by comprising a burner cylinder, wherein the inside of the burner cylinder is provided with an in-cylinder combustion space, the cylinder is provided with a main secondary air inlet channel and an interlayer secondary air annular channel, one end of the burner cylinder is connected with a cyclone burner, and the other end of the burner cylinder is connected with a tail combustion chamber; the primary secondary air inlet channel is communicated to the in-cylinder combustion space, and the interlayer secondary air annular channel is communicated to the tail combustion chamber; and the secondary air rotating directions of the main secondary air inlet channel and the interlayer secondary air annular channel are consistent.
2. The slagging cyclone burner with stratified swirling overfire air of claim 1, wherein said flue gas outlet of said burner barrel is provided at one end of the afterburner.
3. The slagging tap cyclone burner of claim 1, wherein the primary and secondary air inlet channel has an air inlet direction in the tangential direction of the barrel.
4. The slagging cyclone burner of stratified swirl secondary air as claimed in claim 1, wherein the fuel of said cyclone burner is solid fuel, and the primary air containing solid fuel particles is introduced into the combustion space in the barrel through the cyclone burner for combustion.
5. The slagging-off cyclone burner of the layered cyclone overfire air with the interlayer of claim 4, wherein the air volume of the interlayer overfire air of the annular passage of the interlayer overfire air is 10-25% of the total air volume required for the combustion of the solid fuel.
6. A slagging tap cyclone burner according to claim 5, wherein the axial velocity of the laminated secondary air at its outlet is not lower than 30 m/s.
7. The slagging tap cyclone burner of stratified swirl overfire air according to claim 5, wherein the ratio of tangential velocity to axial velocity of said stratified overfire air at its outlet is in the range of 1:2 to 2: 1.
8. The slagging cyclone burner of stratified swirl overfire air according to claim 5 wherein said stratified overfire air is introduced separately or directly from the primary overfire air inlet duct.
9. The slagging tap cyclone burner of stratified swirl overfire air as claimed in claim 1, wherein said afterburner chamber is provided with SOFA air ports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120312228.XU CN215372450U (en) | 2021-02-03 | 2021-02-03 | Liquid slag-discharging cyclone burner with interlayer cyclone secondary air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120312228.XU CN215372450U (en) | 2021-02-03 | 2021-02-03 | Liquid slag-discharging cyclone burner with interlayer cyclone secondary air |
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| Publication Number | Publication Date |
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| CN215372450U true CN215372450U (en) | 2021-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202120312228.XU Active CN215372450U (en) | 2021-02-03 | 2021-02-03 | Liquid slag-discharging cyclone burner with interlayer cyclone secondary air |
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| CN (1) | CN215372450U (en) |
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2021
- 2021-02-03 CN CN202120312228.XU patent/CN215372450U/en active Active
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