CN114321885A - Ultra-low load combustion device suitable for tangential boiler - Google Patents
Ultra-low load combustion device suitable for tangential boiler Download PDFInfo
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- CN114321885A CN114321885A CN202111606354.7A CN202111606354A CN114321885A CN 114321885 A CN114321885 A CN 114321885A CN 202111606354 A CN202111606354 A CN 202111606354A CN 114321885 A CN114321885 A CN 114321885A
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Abstract
The utility model provides an ultra-low load burner who is adapted to tangent circle boiler, relates to combustion boiler technical field, specifically is an ultra-low load burner who is adapted to tangent circle boiler. The invention protects the ultra-low load combustion device: a layer of low-capacity pulverized coal burner is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; the new small-capacity coal powder feeder is communicated with low-capacity coal powder burner, and the modified structure of 5 kinds of tangent circle boilers is obtained. The ultra-low load combustion device can realize the long-term stable operation of the boiler with 15 percent of rated load and below without using any auxiliary combustion-supporting means such as oil, gas, plasma, oxygen enrichment and the like.
Description
Technical Field
The invention relates to the technical field of combustion boilers, in particular to an ultra-low load combustion device suitable for a tangential boiler.
Background
The current thermal power generating unit is used as a main peak regulation power supply in China, deep peak regulation transformation is actively carried out, the peak regulation potential of the thermal power generating unit is fully excavated, and the method has important significance for relieving the current peak regulation pressure in China, absorbing more renewable energy power and promoting the transformation of the power structure in China.
A tangential boiler in an existing thermal power coal-fired unit is provided with 4-7 layers (even more layers) of primary air burners and a plurality of secondary air burners. Even if the tangential boiler is modified, the tangential boiler can only stably operate under 40% of rated load to the maximum extent, and the load operation cannot be further reduced.
Disclosure of Invention
The invention aims to provide an ultra-low load combustion device suitable for a tangential boiler, which can realize long-term stable operation under the conditions of 15 percent of rated load and less than 15 percent of rated load without any auxiliary combustion-supporting means such as oil, gas, plasma, oxygen enrichment and the like.
The invention is suitable for the ultra-low load combustion device I of the tangential boiler:
a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; and a small-capacity coal powder giving device is added and is communicated with the low-capacity coal powder burner.
When the ultra-low load (less than or equal to 15 percent of rated load) of the boiler is carried out by the ultra-low load combustion device, only the low-capacity pulverized coal burner (and the small-capacity pulverized coal feeding device) and the additionally arranged secondary air nozzle are operated; when the boiler load is more than 15% of rated load, the low-capacity pulverized coal burner (and the small-capacity pulverized coal feeding device) and the additional secondary air nozzle (keeping ventilation and cooling) are stopped to operate, and other burners are operated normally.
The invention is suitable for the ultra-low load combustion device II of the tangential boiler:
a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; a coal mill outlet powder feeding pipeline corresponding to the primary air burner (E) at the uppermost layer is transformed into a three-way outlet; one path supplies pulverized coal to the low-capacity pulverized coal burner (F) through the pulverized coal pipeline and the cut-off baffle door, and the other path supplies pulverized coal to the primary air burner (E) on the upper layer of the original pulverized coal burner through the pulverized coal pipeline and the cut-off baffle door.
When the ultra-low load (less than or equal to 15 percent of rated load) of the boiler is in ultra-low load, only the low-capacity pulverized coal burner (and the corresponding powder feeding pipeline) and the added secondary air nozzle are operated; when the boiler load is required to be more than 15 percent of rated load, the low-capacity pulverized coal burner (and a corresponding powder feeding pipeline) is stopped to operate, the secondary air nozzle is additionally arranged, the other path of the secondary air nozzle is opened to supply pulverized coal for the primary air burner (E) at the upper layer of the original pulverized coal through the pulverized coal pipeline and the stop baffle door, and other burners are operated as usual.
The invention is suitable for the ultra-low load combustion device III of the tangential boiler:
a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; a small-capacity coal powder giving device is added and is communicated with the low-capacity coal powder burner; the original primary air burner (E) at the uppermost layer is transformed into a graded low-capacity pulverized coal burner, and the graded low-capacity pulverized coal burner is composed of an upper low-capacity pulverized coal burner and a lower low-capacity pulverized coal burner; a coal mill outlet powder feeding pipeline corresponding to the primary air burner (E) on the uppermost layer is transformed into a three-way two-way outlet; one path of the pulverized coal is supplied to one layer of low-capacity pulverized coal burners (E2 or E1) in the graded low-capacity pulverized coal burners through a pulverized coal pipeline and a cut-off baffle door, and the other path of the pulverized coal is supplied to the upper and lower layers of low-capacity pulverized coal burners (E2 and E1) simultaneously through the pulverized coal pipeline and the cut-off baffle door and a three-way pipe of the pulverized coal pipeline in front of the furnace.
When the ultra-low load combustion device is used for the ultra-low load (less than or equal to 15 percent of rated load) of the boiler, only the low-capacity pulverized coal burner (and the corresponding powder feeding pipeline) and one layer of low-capacity pulverized coal burner (E2 or E1) in the graded low-capacity pulverized coal burner and the additional secondary air nozzle are operated; when the boiler load is required to be more than 15 percent of rated load, the low-capacity pulverized coal burner (and the corresponding pulverized coal feeding pipeline) stops running, the pulverized coal feeding pipeline of the independent low-capacity pulverized coal burner in the graded low-capacity pulverized coal burner layer is additionally provided with the secondary air nozzle, the other path of the secondary air nozzle is opened, pulverized coal is simultaneously supplied to the upper and lower low-capacity pulverized coal burners E2 and E1 through the pulverized coal pipeline and the stop baffle door and the pulverized coal pipeline tee joint in front of the boiler, and other burners are operated as usual.
The invention is suitable for the ultra-low load combustion device of the tangential boiler four:
one layer of primary air burner in the original primary air burner is reformed into a graded low-capacity pulverized coal burner, and the graded low-capacity pulverized coal burner consists of an upper 2 low-capacity pulverized coal burners and a lower 2 low-capacity pulverized coal burners; a coal mill outlet powder feeding pipeline corresponding to the reformed layer primary air burner is reformed into a three-way two-way outlet; the first path supplies pulverized coal to a layer of low-capacity pulverized coal burner in the graded low-capacity pulverized coal burner through a pulverized coal pipeline and a stop baffle door, wherein the layer of low-capacity pulverized coal burner is an independent layer of low-capacity pulverized coal burner; the second path supplies pulverized coal to the upper and lower layers of low-capacity pulverized coal burners simultaneously through the pulverized coal pipeline and the cut-off baffle gate in cooperation with the three-way of the pulverized coal pipeline in front of the furnace;
and a coal mill outlet powder feeding pipeline corresponding to the primary air burner of the adjacent layer of the reconstruction layer is reconstructed into a three-way two-way outlet, the first way supplies coal powder to the non-independent layer low-capacity coal burner in the graded low-capacity coal burner through a coal powder pipeline and a stop baffle door, and the second way supplies coal powder to the primary air burner of the adjacent layer through the coal powder pipeline and the stop baffle door.
When the ultra-low load combustion device is used for the ultra-low load (less than or equal to 15 percent of rated load) of the boiler, only the first powder feeding pipeline and the first powder feeding pipeline in the modification layer are operated, namely, the upper layer low-capacity coal powder combustor and the lower layer low-capacity coal powder combustor are respectively supplied with coal powder; when the boiler load is required to be more than 15% of the rated load, stopping operating the first powder feeding pipeline and the first powder feeding pipeline in the reconstruction layer, starting the second powder feeding pipeline and the adjacent layer of the second powder feeding pipeline in the reconstruction layer, and operating other burners as usual.
The invention is suitable for the ultra-low load combustion device five of the tangential boiler:
the method comprises the following steps of modifying two adjacent layers of primary air burners in the original primary air burners into graded low-volume pulverized coal burners, wherein each graded low-volume pulverized coal burner is composed of an upper low-volume pulverized coal burner and a lower low-volume pulverized coal burner; the coal mill outlet powder feeding pipelines corresponding to the primary air burners of the reconstruction layer are reconstructed into three-way two-way outlets; the first path of each layer in the reconstruction layer passes through a pulverized coal pipeline and a stop baffle door to supply pulverized coal to a layer of low-capacity pulverized coal burner in the graded low-capacity pulverized coal burner, wherein the layer of low-capacity pulverized coal burner is an independent layer of low-capacity pulverized coal burner; the second path of each layer in the reconstruction layer passes through the pulverized coal pipeline and the stop baffle door and is matched with the three-way of the pulverized coal pipeline in front of the furnace to simultaneously supply pulverized coal for the upper and lower layers of low-capacity pulverized coal burners of the layer.
When the ultra-low load combustion device is used for the ultra-low load (less than or equal to 15 percent of rated load) of the boiler, only the first powder conveying pipeline in the two transformed layers is operated, and the coal powder is supplied to the 2 independent layers of low-capacity coal powder burners in the two transformed layers; when the boiler load is required to be more than 15 percent of the rated load, the first powder conveying pipeline in the two reconstruction layers is stopped to operate, the second powder conveying pipeline in the two reconstruction layers is opened, and other burners are operated as usual.
The low-capacity pulverized coal feeding device is provided with corresponding coal feeding and cold and hot air systems in a matching way, and the low-capacity pulverized coal burner is provided with a wind box air duct and a water-cooled wall in a matching way. Low-volume pulverized coal burner: is a nozzle and a pulverized coal burner with a smaller capacity than the burner. The small-capacity coal powder giving device comprises: the system comprises a coal mill with small output, corresponding coal supply and cold and hot air systems and a powder conveying pipeline. The powder feeding pipeline comprises a pulverized coal pipeline and a stop baffle door. The powder discharging capacity of the independent small-capacity coal powder feeding device is adjustable, and the flexible operation requirement of ultra-low load can be met. After the small-capacity pulverized coal feeding device stops running, the arranged low-capacity pulverized coal burner is subjected to air distribution forced cooling, so that the high-temperature burning loss resistance is ensured when the unit runs above 15% of rated load.
The small-capacity coal powder giving device gives fine and uniform coal powder, small particle groups in the coal powder cloud have small heat capacity, and the coal powder cloud can be quickly heated to the ignition temperature, so that the output force is adjustable, the coal powder cloud with good powder fineness and uniformity is provided, and the optimal condition is provided for the coal powder to burn out when the boiler is in ultra-low load operation.
The coal burning amount of a unit (boiler) is reduced sharply during the ultra-low load operation, the prior conventional burner nozzle is large and cannot ensure the speed, ignition temperature, rigidity and combustion stability of the burner coal dust, and the low-capacity coal dust burner has low heat capacity and less ignition heat, can ensure the speed and quick ignition of the burner coal dust, has good burnout effect and can realize the efficient and stable combustion of the coal dust.
Compared with the prior art, the invention has the following advantages:
1. the invention realizes the stable operation of the tangential boiler under the ultra-low load of 15 percent of rated load and below without any auxiliary combustion-supporting means;
2. the low-capacity pulverized coal burner has low heat capacity, can quickly catch fire, and has strong low-load stability;
3. the low-capacity pulverized coal burner is provided with an independent powder feeding pipeline and can be flexibly switched on and off according to load change;
4. the operation indexes of the boiler reformed by the invention are not lower than the operation level before reforming, and the boiler can be ensured to operate efficiently, safely, stably and environmentally for a long time.
Drawings
FIG. 1 is a schematic structural diagram of embodiments 1 and 2 of the present invention;
FIG. 2 is a schematic structural diagram of embodiments 3 and 4 of the present invention;
FIG. 3 is a schematic structural diagram of embodiment 5 of the present invention;
FIG. 4 is a schematic structural diagram of embodiment 6 of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment is suitable for the ultra-low load combustion device of the tangential boiler:
a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; and a small-capacity coal powder giving device is added and is communicated with the low-capacity coal powder burner. The front and rear pairs of the modified tangential boiler are shown in figure 1.
In the ultra-low load combustion device of the embodiment, when the boiler is under ultra-low load (less than or equal to 15 percent of rated load), only the low-capacity pulverized coal burner (and the small-capacity pulverized coal feeding device) and the added secondary air nozzle are operated; when the boiler load is more than 15% of rated load, the low-capacity pulverized coal burner (and small-capacity pulverized coal supply device) and the additional secondary air nozzle are stopped to operate, such as other burners are operated normally.
Example 2:
the embodiment is suitable for the ultra-low load combustion device of the tangential boiler:
a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; a coal mill outlet powder feeding pipeline corresponding to the primary air burner (E) at the uppermost layer is transformed into a three-way outlet; one path supplies pulverized coal to the low-capacity pulverized coal burner (F) through the pulverized coal pipeline and the cut-off baffle door, and the other path supplies pulverized coal to the primary air burner (E) on the upper layer of the original pulverized coal burner through the pulverized coal pipeline and the cut-off baffle door. The front and rear pairs of the modified tangential boiler are shown in figure 1.
In the ultra-low load combustion device of the embodiment, when the boiler is under ultra-low load (less than or equal to 15 percent of rated load), only the low-capacity pulverized coal burner (and the corresponding powder feeding pipeline) and the added secondary air nozzle are operated; when the boiler load is required to be more than 15 percent of rated load, the low-capacity pulverized coal burner (and a corresponding powder feeding pipeline) is stopped to operate, the secondary air nozzle is additionally arranged, the other path of the secondary air nozzle is opened to supply pulverized coal for the primary air burner (E) at the upper layer of the original pulverized coal through the pulverized coal pipeline and the stop baffle door, and other burners are operated as usual.
Example 3:
the embodiment is suitable for the ultra-low load combustion device of the tangential boiler:
a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; a small-capacity coal powder giving device is added and is communicated with the low-capacity coal powder burner; the original primary air burner (E) at the uppermost layer is transformed into a graded low-capacity pulverized coal burner, and the graded low-capacity pulverized coal burner is composed of an upper low-capacity pulverized coal burner and a lower low-capacity pulverized coal burner; a coal mill outlet powder feeding pipeline corresponding to the primary air burner (E) on the uppermost layer is transformed into a three-way two-way outlet; one path of the pulverized coal is supplied to one layer of low-capacity pulverized coal burner (E2) in the graded low-capacity pulverized coal burner through the pulverized coal pipeline and the cut-off baffle door, and the other path of the pulverized coal is supplied with pulverized coal for the upper and lower layers of low-capacity pulverized coal burners (E2 and E1) simultaneously through the pulverized coal pipeline and the cut-off baffle door and the three-way pipe of the pulverized coal pipeline in front of the furnace. The front and rear pairs of the modified tangential boiler are shown in fig. 2.
In the ultra-low load combustion device of the embodiment, when the boiler is under ultra-low load (less than or equal to 15 percent of rated load), only the low-capacity pulverized coal burner (and the corresponding powder feeding pipeline), one layer of low-capacity pulverized coal burner (E2) in the graded low-capacity pulverized coal burner and the additional secondary air nozzle are operated; when the boiler load is required to be more than 15 percent of rated load, the low-capacity pulverized coal burner (and the corresponding pulverized coal feeding pipeline) stops running, the pulverized coal feeding pipeline of the independent low-capacity pulverized coal burner in the graded low-capacity pulverized coal burner layer is additionally provided with the secondary air nozzle, the other path of the secondary air nozzle is opened, pulverized coal is simultaneously supplied to the upper and lower low-capacity pulverized coal burners E2 and E1 through the pulverized coal pipeline and the stop baffle door and the pulverized coal pipeline tee joint in front of the boiler, and other burners are operated as usual.
The pulverized coal pipeline tee is a pipeline tee suitable for a pulverized coal pipeline.
Example 4:
the embodiment is suitable for the ultra-low load combustion device of the tangential boiler:
a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; a small-capacity coal powder giving device is added and is communicated with the low-capacity coal powder burner; the original primary air burner (E) at the uppermost layer is transformed into a graded low-capacity pulverized coal burner, and the graded low-capacity pulverized coal burner is composed of an upper low-capacity pulverized coal burner and a lower low-capacity pulverized coal burner; a coal mill outlet powder feeding pipeline corresponding to the primary air burner (E) on the uppermost layer is transformed into a three-way two-way outlet; one path of the pulverized coal is supplied to one layer of low-capacity pulverized coal burner (E1) in the graded low-capacity pulverized coal burner through the pulverized coal pipeline and the cut-off baffle door, and the other path of the pulverized coal is supplied with pulverized coal for the upper and lower layers of low-capacity pulverized coal burners (E2 and E1) simultaneously through the pulverized coal pipeline and the cut-off baffle door and the three-way pipe of the pulverized coal pipeline in front of the furnace. The front and rear pairs of the modified tangential boiler are shown in fig. 2.
In the ultra-low load combustion device of the embodiment, when the boiler is under ultra-low load (less than or equal to 15 percent of rated load), only the low-capacity pulverized coal burner (and the corresponding powder feeding pipeline), one layer of low-capacity pulverized coal burner (E1) in the graded low-capacity pulverized coal burner and the additional secondary air nozzle are operated; when the boiler load is required to be more than 15 percent of rated load, the low-capacity pulverized coal burner (and the corresponding pulverized coal feeding pipeline) stops running, the pulverized coal feeding pipeline of the independent low-capacity pulverized coal burner in the graded low-capacity pulverized coal burner layer is additionally provided with the secondary air nozzle, the other path of the secondary air nozzle is opened, pulverized coal is simultaneously supplied to the upper and lower low-capacity pulverized coal burners E2 and E1 through the pulverized coal pipeline and the stop baffle door and the pulverized coal pipeline tee joint in front of the boiler, and other burners are operated as usual.
Example 5:
the embodiment is suitable for the ultra-low load combustion device of the tangential boiler:
one layer of primary air burner (E layer) in the original primary air burner is reformed into a graded low-capacity pulverized coal burner (E1 layer and E2 layer), and the graded low-capacity pulverized coal burner consists of an upper 2 low-capacity pulverized coal burners and a lower 2 low-capacity pulverized coal burners; a coal mill outlet powder feeding pipeline of the reformed layer primary air burner is reformed into a three-way two-way outlet; the first path supplies pulverized coal to a layer of low-capacity pulverized coal burner (E1) in the graded low-capacity pulverized coal burner through a pulverized coal pipeline and a stop baffle door, and the layer of low-capacity pulverized coal burner is an independent layer of low-capacity pulverized coal burner; the second path supplies pulverized coal for an upper layer and a lower layer of low-capacity pulverized coal burners (E1 and E2) simultaneously through a pulverized coal pipeline and a cut-off baffle gate and a boiler front pulverized coal pipeline tee joint;
a coal mill outlet powder feeding pipeline corresponding to a primary air burner (D layer) of one layer adjacent to the reconstruction layer is reconstructed into a three-way two-way outlet, a first way supplies coal powder to a non-independent layer low-capacity coal powder burner (E2) in the graded low-capacity coal powder burner through a coal powder pipeline and a stop baffle door, and a second way supplies coal powder to the primary air burner (D layer) of the adjacent layer through the coal powder pipeline and the stop baffle door. The before and after reforming pairs of the tangential boilers are shown in fig. 3.
In the ultra-low load combustion device of the embodiment, when the boiler is under ultra-low load (less than or equal to 15% of rated load), only the first powder feeding pipeline and the first powder feeding pipeline in the modification layer are operated, namely, the upper layer low-capacity coal powder combustor and the lower layer low-capacity coal powder combustor are respectively supplied with coal powder; when the boiler load is required to be more than 15% of the rated load, stopping operating the first powder feeding pipeline and the first powder feeding pipeline in the reconstruction layer, starting the second powder feeding pipeline and the adjacent layer of the second powder feeding pipeline in the reconstruction layer, and operating other burners as usual.
The modified layer of this embodiment may be any layer (A, B, C, D or E-layer).
Example 6:
the embodiment is suitable for the ultra-low load combustion device of the tangential boiler:
the method comprises the following steps of (1) transforming primary air burners of two adjacent layers (a layer D and a layer E) in the original primary air burners into graded low-capacity pulverized coal burners, wherein the graded low-capacity pulverized coal burners are composed of an upper low-capacity pulverized coal burner and a lower low-capacity pulverized coal burner (the upper low-capacity pulverized coal burners are respectively provided with a layer D1, a layer D2, a layer E1 and a layer E2); the coal mill outlet powder feeding pipelines corresponding to the primary air burners of the reconstruction layer are reconstructed into three-way two-way outlets; the first path of each layer in the reconstruction layer passes through a pulverized coal pipeline and a stop baffle door to supply pulverized coal to a layer of low-capacity pulverized coal burner (D2 and E1 respectively) in the graded low-capacity pulverized coal burner, and the layer of low-capacity pulverized coal burner is an independent layer of low-capacity pulverized coal burner; the second path of each layer in the reconstruction layer passes through a pulverized coal pipeline and a stop baffle door and is matched with a three-way pipe of the pulverized coal pipeline in front of the furnace to simultaneously supply pulverized coal for the upper and lower low-capacity pulverized coal burners (E1 and E2; D1 and D2) of the layer. The before and after reforming pairs of the tangential boilers are shown in fig. 4.
In the ultra-low load combustion device of the embodiment, when the boiler is under ultra-low load (less than or equal to 15 percent of rated load), only the first powder conveying pipeline in the two transformed layers is operated, namely, the coal powder is supplied to the low-capacity coal powder burners (D2 and E1) of the 2 independent layers in the two transformed layers; when the boiler load is required to be more than 15 percent of the rated load, the first powder conveying pipeline in the two reconstruction layers is stopped to operate, the second powder conveying pipeline in the two reconstruction layers is opened, and other burners are operated as usual.
The engineered layer of this embodiment may be any adjacent layer (a and B, B and C, C and D, D and E).
In the embodiments 1 to 6, the small-capacity pulverized coal feeding device is provided with a corresponding coal feeding system and a corresponding cold and hot air system, and the low-capacity pulverized coal burner is provided with an air duct of an air box and a water-cooled wall. Low-volume pulverized coal burner: is a nozzle and a pulverized coal burner with a smaller capacity than the burner. The small-capacity coal powder giving device comprises: the system comprises a coal mill with small output, corresponding coal supply and cold and hot air systems and a powder conveying pipeline. The powder feeding pipeline comprises a pulverized coal pipeline and a stop baffle door. The powder discharging capacity of the independent small-capacity coal powder feeding device is adjustable, and the flexible operation requirement of ultra-low load can be met. After the small-capacity pulverized coal feeding device stops running, the arranged low-capacity pulverized coal burner is subjected to air distribution forced cooling, so that the high-temperature burning loss resistance is ensured when the unit runs above 15% of rated load.
The ultra-low load combustion devices of the embodiments 1 to 6 can quickly catch fire without any auxiliary combustion-supporting means when the boiler is under ultra-low load, and realize long-term, efficient, safe and stable operation.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides an ultra-low load burner who is adapted to tangent circle boiler which characterized in that: a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; and a small-capacity coal powder giving device is added and is communicated with the low-capacity coal powder burner.
2. The utility model provides an ultra-low load burner who is adapted to tangent circle boiler which characterized in that: a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; a coal mill outlet powder feeding pipeline corresponding to the primary air burner (E) at the uppermost layer is transformed into a three-way outlet; one path supplies pulverized coal to the low-capacity pulverized coal burner (F) through the pulverized coal pipeline and the cut-off baffle door, and the other path supplies pulverized coal to the primary air burner (E) on the upper layer of the original pulverized coal burner through the pulverized coal pipeline and the cut-off baffle door.
3. The utility model provides an ultra-low load burner who is adapted to tangent circle boiler which characterized in that: a layer of low-capacity pulverized coal burner (F) is additionally arranged on the primary air burner at the uppermost layer, and a layer of secondary air nozzle is additionally arranged on the low-capacity pulverized coal burner; a small-capacity coal powder giving device is added and is communicated with the low-capacity coal powder burner; the original primary air burner (E) at the uppermost layer is transformed into a graded low-capacity pulverized coal burner, and the graded low-capacity pulverized coal burner is composed of an upper low-capacity pulverized coal burner and a lower low-capacity pulverized coal burner; a coal mill outlet powder feeding pipeline corresponding to the primary air burner (E) on the uppermost layer is transformed into a three-way two-way outlet; one path of the pulverized coal is supplied to one layer of low-capacity pulverized coal burners (E2 or E1) in the graded low-capacity pulverized coal burners through a pulverized coal pipeline and a cut-off baffle door, and the other path of the pulverized coal is supplied to the upper and lower layers of low-capacity pulverized coal burners (E2 and E1) simultaneously through the pulverized coal pipeline and the cut-off baffle door and a three-way pipe of the pulverized coal pipeline in front of the furnace.
4. The utility model provides an ultra-low load burner who is adapted to tangent circle boiler which characterized in that: one layer of primary air burner in the original primary air burner is reformed into a graded low-capacity pulverized coal burner, and the graded low-capacity pulverized coal burner consists of an upper 2 low-capacity pulverized coal burners and a lower 2 low-capacity pulverized coal burners; a coal mill outlet powder feeding pipeline corresponding to the reformed layer primary air burner is reformed into a three-way two-way outlet; the first path supplies pulverized coal to a layer of low-capacity pulverized coal burner in the graded low-capacity pulverized coal burner through a pulverized coal pipeline and a stop baffle door, wherein the layer of low-capacity pulverized coal burner is an independent layer of low-capacity pulverized coal burner; the second path supplies pulverized coal to the upper and lower layers of low-capacity pulverized coal burners simultaneously through the pulverized coal pipeline and the cut-off baffle gate in cooperation with the three-way of the pulverized coal pipeline in front of the furnace;
and a grinding outlet powder feeding pipeline corresponding to the primary air burner of the adjacent layer of the reconstruction layer is reconstructed into a three-way two-way outlet, the first way supplies pulverized coal to the non-independent layer low-capacity pulverized coal burner in the graded low-capacity pulverized coal burner through the pulverized coal pipeline and the cut-off baffle door, and the second way supplies pulverized coal to the primary air burner of the adjacent layer through the pulverized coal pipeline and the cut-off baffle door.
5. The utility model provides an ultra-low load burner who is adapted to tangent circle boiler which characterized in that: the method comprises the following steps of modifying two adjacent layers of primary air burners in the original primary air burners into graded low-volume pulverized coal burners, wherein each graded low-volume pulverized coal burner is composed of an upper low-volume pulverized coal burner and a lower low-volume pulverized coal burner; the coal mill outlet powder feeding pipelines corresponding to the primary air burners of the reconstruction layer are reconstructed into three-way two-way outlets; the first path of each layer in the reconstruction layer passes through a pulverized coal pipeline and a stop baffle door to supply pulverized coal to a layer of low-capacity pulverized coal burner in the graded low-capacity pulverized coal burner, wherein the layer of low-capacity pulverized coal burner is an independent layer of low-capacity pulverized coal burner; the second path of each layer in the reconstruction layer passes through the pulverized coal pipeline and the stop baffle door and is matched with the three-way of the pulverized coal pipeline in front of the furnace to simultaneously supply pulverized coal for the upper and lower layers of low-capacity pulverized coal burners of the layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111606354.7A CN114321885A (en) | 2021-12-26 | 2021-12-26 | Ultra-low load combustion device suitable for tangential boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111606354.7A CN114321885A (en) | 2021-12-26 | 2021-12-26 | Ultra-low load combustion device suitable for tangential boiler |
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| Publication Number | Publication Date |
|---|---|
| CN114321885A true CN114321885A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111606354.7A Pending CN114321885A (en) | 2021-12-26 | 2021-12-26 | Ultra-low load combustion device suitable for tangential boiler |
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| Country | Link |
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| CN (1) | CN114321885A (en) |
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- 2021-12-26 CN CN202111606354.7A patent/CN114321885A/en active Pending
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