CN111121006A - Horizontal pulverized coal boiler and control method thereof - Google Patents
Horizontal pulverized coal boiler and control method thereof Download PDFInfo
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- CN111121006A CN111121006A CN201811293684.3A CN201811293684A CN111121006A CN 111121006 A CN111121006 A CN 111121006A CN 201811293684 A CN201811293684 A CN 201811293684A CN 111121006 A CN111121006 A CN 111121006A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L11/00—Arrangements of valves or dampers after the fire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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Abstract
The invention relates to a horizontal pulverized coal fired boiler and a control method thereof, wherein the boiler comprises a hearth and a tail flue which are sequentially connected, wherein: the hearth is arranged in such a way that flue gas flows horizontally in the hearth; and the bottom of the hearth is provided with a bottom air distribution device. The bottom air distribution device can be introduced with tertiary air. The invention also relates to a control method of the horizontal pulverized coal boiler, which comprises the following steps: introducing primary air and secondary air into the hearth, wherein the primary air carries pulverized coal to flow through the hearth in a roughly horizontal direction; and introducing tertiary air into the hearth through a bottom air distribution device arranged at the bottom of the hearth. The tertiary air at the bottom of the furnace can act as over-fire air to reduce NOx emissions and/or as transport air to prevent fly ash buildup.
Description
Technical Field
The embodiment of the invention relates to the field of boilers, in particular to a horizontal pulverized coal boiler and a control method thereof.
Background
The horizontal boiler is one of the main forms of industrial pulverized coal boilers and is mainly applied to boilers of 20t/h grade and below. However, the horizontal pulverized coal fired boiler has major problems including: 1) the powder deposition phenomenon exists at the bottom of the hearth, part of the pulverized coal is not completely combusted, a water seal tank and a scraper conveyor are needed at the bottom of the hearth, and the combustion efficiency and the heat efficiency of the boiler are lower; 2) the primary air and the secondary air are intensively configured at the position of the burner mainly for air distribution, and the original NOx emission level of the boiler is high; 3) the boiler capacity is difficult to scale up.
Disclosure of Invention
The present invention has been made to alleviate or solve at least one of the above-mentioned problems of the horizontal pulverized coal boiler.
According to an aspect of an embodiment of the present invention, the present invention provides a horizontal pulverized coal fired boiler, including a furnace and a tail flue connected in sequence, wherein: the hearth is arranged in such a way that flue gas flows horizontally in the hearth; and the bottom of the hearth is provided with a bottom air distribution device.
Optionally, the hearth and the tail flue are arranged side by side, flue gas runners of the hearth and the tail flue are horizontally arranged and communicated with each other to form a U shape, and the flow direction of flue gas in the hearth is opposite to the flow direction of flue gas in the tail flue. Furthermore, the hearth and the tail flue share one side wall, and the hearth is communicated with the tail flue through an opening in the side wall.
Optionally, the hearth is connected in series with the tail flue, and the flow direction of the flue gas in the hearth is the same as that of the flue gas in the tail flue.
Optionally, in the flue gas flowing direction, the flow cross-sectional area of the flue gas in the hearth is gradually increased. Further, the distance between at least one part of the two side walls of the hearth is gradually increased.
Optionally, the bottom air distribution device is an air distribution plate with an air chamber and an air cap, and the bottom air distribution device is used for introducing tertiary air; the air distribution plate forms at least one part of the bottom of the hearth. Furthermore, the bottom air distribution device is arranged at the bottom of the hearth in the whole length direction. Furthermore, the bottom air distribution device is arranged on the whole cross section of the bottom of the hearth.
Optionally, the bottom air distribution device includes an air distribution pipe and an air cap arranged on the air distribution pipe, and is used for introducing tertiary air.
Optionally, the bottom air distribution device is arranged to spray tertiary air upwards perpendicularly.
Optionally, the lower part of the side wall of the furnace, which extends substantially parallel to the flow direction of the flue gas, is inclined inward toward the bottom of the furnace. Furthermore, the included angle between the lower part of the side wall and the vertical direction is greater than 30 degrees. Optionally, a side wall air distribution device is arranged at the lower part of the side wall.
Optionally, the air distribution device is provided with a plurality of air chambers sequentially arranged along the front-back direction, and the air volume of each air chamber is suitable for being independently controlled.
Optionally, the hearth has a front wall, and the front wall is provided with a primary tuyere and a secondary tuyere, and primary air from the primary tuyere carries pulverized coal to enter the hearth in a substantially horizontal direction.
According to another aspect of an embodiment of the present invention, there is provided a control method of a horizontal pulverized coal boiler, including the steps of: introducing primary air and secondary air into the hearth, wherein the primary air carries pulverized coal to the hearth in a roughly horizontal direction; and introducing tertiary air into the hearth through a bottom air distribution device arranged at the bottom of the hearth.
Optionally, a part of the tertiary air is introduced through an air distribution device arranged at the lower part of the side wall and/or the lower part of the middle wall of the hearth.
Optionally, the air distribution device includes a plurality of air chambers sequentially arranged in the front-rear direction, and the method further includes the steps of: the air volume of each air chamber is independently controlled.
Optionally, the tertiary air is provided over the entire cross-section of the bottom of the furnace.
Optionally, the air for burning the pulverized coal is divided into primary air, secondary air and tertiary air, wherein the proportion of the primary air to the air for burning is 10-30%, the proportion of the secondary air to the air for burning is 20-40%, and the proportion of the tertiary air to the air for burning is 40-60%.
Optionally, the method further comprises the steps of: the temperature range of the pulverized coal combustion in the hearth is controlled between 1000 ℃ and 1200 ℃.
According to another aspect of the embodiments of the present invention, a horizontal pulverized coal fired boiler is provided, which includes a front wall, a middle wall, a rear wall, a furnace side wall, a flue side wall and a ceiling, the boiler has a furnace and a tail flue, and the furnace and the tail flue are communicated with each other through a channel arranged on the middle wall, wherein: the lower parts of the side walls and the middle wall of the hearth are both inclined downwards towards the air distribution plate; and air distribution devices are arranged at the lower parts of the side walls and the middle wall of the hearth. Optionally, the air distribution device is used for introducing tertiary air.
Drawings
FIG. 1 is a schematic view of a horizontal pulverized coal boiler in accordance with an exemplary embodiment of the present invention;
FIG. 2 is a plan view of the lower part of the furnace of the pulverized coal fired boiler in FIG. 1;
fig. 3 is a side view of the pulverized coal boiler in fig. 1;
FIG. 4 is a schematic view of a horizontal pulverized coal boiler in accordance with another exemplary embodiment of the present invention; and
fig. 5 is a schematic top view of a lower furnace of a horizontal pulverized coal boiler in accordance with still another exemplary embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
Fig. 1 to 3 show a main body part of a horizontal pulverized coal boiler according to an exemplary embodiment of the present invention, which includes a furnace front wall 51, a furnace rear wall 52, side walls 53, a middle wall 54, side walls 55, a ceiling 56, and a grid 5 at the bottom of the furnace;
the hearth front wall 51, the rear wall 52, the side walls 53, the middle wall 54, the ceiling 56 and the air distribution plate 7 enclose the hearth 4; the front wall 41 is provided with a pulverized coal burner 41;
the middle wall 54, the side wall 55, the front wall 51, the rear wall 52 and the ceiling 56 enclose to form the tail flue 6, the middle wall 54 is provided with a dilution pipe forming a passage, and high-temperature flue gas generated by burning pulverized coal is transferred into the tail flue 6 through the dilution pipe;
the included angle between the lower part of the side wall 53 and the lower part of the middle wall 54 and the air distribution plate is larger than 90 degrees and smaller than 150 degrees, optionally smaller than 135 degrees, and in addition, optionally, the side wall 53 and the middle wall 54 are symmetrically arranged around the central line of the hearth;
the air distribution plate 7 is provided with an air cap 71, an air chamber 72 is arranged below the air distribution plate 7, in an alternative embodiment, slag discharge pipes 731, 732, 733 (shown in fig. 1) penetrating the air chamber and the air distribution plate are also arranged, but as shown in fig. 4, the slag discharge pipes are not required to be arranged;
a flag type heating surface 61 can be installed in the tail flue 6;
the burner comprises a primary air pipe 1 and a secondary air pipe 2, an air chamber 72 is connected with a tertiary air pipe 3, and tertiary air enters a hearth 4 through the air chamber 72 and an air cap 71. The tertiary air is supplied into the furnace from the whole section of the bottom of the hearth, so that gradual oxygen supply combustion is realized. In an alternative embodiment, a wind distribution pipe and a wind cap may be provided to introduce the tertiary air.
When the hearth 4 is enclosed by the front wall 51, the rear wall 52, the side walls 53, the middle wall 54, the ceiling 56 and the air distribution plate 7, a water seal tank and a scraper for discharging ash at the bottom of the horizontal boiler are not needed.
In the embodiment shown in the attached drawings, the hearth and the tail flue are arranged side by side, flue gas flow channels of the hearth and the tail flue are horizontally arranged and communicated with each other to form a U shape, and the flow direction of flue gas in the hearth is opposite to that of flue gas in the tail flue. However, optionally, the furnace and the tail flue are arranged in series, and the flow direction of the flue gas in the furnace is the same as that of the flue gas in the tail flue.
It should be noted that the flow cross-sectional area of the furnace flue gas can be gradually increased in the flow direction of the flue gas. In a further embodiment, the distance between at least a portion of the two side walls of the furnace may be gradually increased.
The following illustrates the specific operation of the boiler.
The primary air carrying the pulverized coal enters the burner 41 through the primary air pipe 1, the secondary air enters the burner 41 through the secondary air pipe 2, the tertiary air is introduced into the hearth through the tertiary air pipe 3 arranged at the bottom of the furnace, the primary air and the secondary air are sprayed out in the horizontal direction, the tertiary air is sprayed out vertically upwards, and the secondary air and the tertiary air can be air or mixed gas of air and recirculated flue gas.
After the pulverized coal is ignited by the horizontally arranged burner, the pulverized coal is sprayed out in the horizontal direction in the hearth, the pulverized coal is partially combusted after meeting with secondary air, and unburned gas and carbon particles are continuously mixed and combusted with tertiary air introduced from the whole bottom surface of the hearth in the forward spraying and flowing process until the pulverized coal is completely combusted. During the horizontal combustion process of the pulverized coal in the horizontal furnace, the fly ash generated by pulverized coal combustion moves forward along with the airflow, the tertiary air is arranged on the whole cross section of the bottom of the furnace, the area of the bottom of the furnace is smaller than or equal to the area of the upper part of the furnace, the airflow speed of the bottom of the furnace is higher than that of the upper part of the furnace, the fly ash generated by pulverized coal combustion cannot be deposited in the furnace, the fly ash flows into a tail flue along with flue gas to participate in heat exchange, and. Fly ash generated by pulverized coal combustion enters a bag-type dust collector at the tail part of the system after heat exchange and is collected, the collected fly ash is dry ash and is convenient to transport and utilize, a water seal tank and a scraper are omitted at the bottom of the furnace, wet ash is not discharged completely, the equipment structure is simplified, and the stability, safety and cleanness of the system are guaranteed.
The air for burning the coal dust is divided into primary air, secondary air and tertiary air, wherein the proportion of the primary air is 10-30%, the proportion of the secondary air is 20-40%, and the proportion of the tertiary air is 40-60%. For example, the primary air proportion is 20%, the secondary air proportion is 40%, and the tertiary air proportion is 40%; the proportion of primary air is 10 percent, the proportion of secondary air is 30 percent and the proportion of tertiary air is 60 percent; the proportion of primary air is 30 percent, the proportion of secondary air is 20 percent, and the proportion of tertiary air is 50 percent; the proportion of primary air is 15%, the proportion of secondary air is 25% and the proportion of tertiary air is 60%.
Because the tertiary air is uniformly supplied into the furnace from the whole section of the furnace bottom, the pulverized coal is changed into gradual oxygen supply combustion from the conventional concentrated air supply combustion or common staged combustion mode in the hearth, and the infinite staged combustion of the whole hearth region is realized. The coal powder reduction combustion area is large and the time is long, so that the conversion tendency of fuel N to NOx is greatly inhibited. Meanwhile, in the step-by-step reaction of the coal powder, the temperature range of the combustion of the coal powder is controlled between 1000 ℃ and 1200 ℃, which is favorable for 1000-1100 ℃, and the generation of thermal NOx can be effectively prevented or reduced. Therefore, the combustion mode can realize the ultra-low NOx emission level of pulverized coal combustion.
It should be noted that the bottom air distribution device arranged at the bottom of the hearth of the horizontal pulverized coal boiler supplies air to the interior of the hearth, so as to play a role in reducing NOx emission, and the invention is within the protection scope of the invention.
The conventional horizontal boiler mainly has the capacity of 20 tons or less, the boiler has small capacity, the main reason is that the powder is seriously deposited at the bottom of the original horizontal boiler, and if an air supply structure with an air distribution plate and an air cap at the bottom of a hearth or an air distribution device is adopted, the powder deposition phenomenon in the boiler is not present or greatly reduced, and the boiler capacity can be enlarged to the grade of 75t/h or above.
As shown in fig. 1-2, the air distribution plate 7 is provided with an air cap 71, an air chamber 72 is arranged below the air distribution plate 7, and three air distribution chambers, namely an air distribution chamber 721, an air distribution chamber 722 and an air distribution chamber 723, are arranged from left to right;
each air chamber is respectively provided with an air supply pipe, the air dividing chamber 721 is connected with the tertiary air pipe 31, the air dividing chamber 722 is connected with the tertiary air pipe 32, and the air dividing chamber 723 is connected with the tertiary air pipe 33.
The air quantity of each air chamber can be respectively controlled by an adjusting valve and measured by a flowmeter, the air quantity control principle of the tertiary air is related to the hearth temperature, if the hearth temperature at the air supply area is higher, the air quantity at the position needs to be reduced, the hearth temperature is adjusted by the air quantity control principle, the local high temperature is effectively prevented or slowed down, and the coal dust combustion adhesion and the generation of thermal NOx are avoided or reduced.
And a multi-air-chamber air supply mode is adopted, the air quantity is easy to adjust, and the combustion control of the whole hearth is realized.
It should be noted that although a plurality of plenums are used in the example, only one plenum may be provided.
Although not shown, air distribution devices may be disposed at the lower portions of the side walls and the lower portion of the middle wall of the furnace, which are both inclined downward toward the air distribution plate, to reduce NOx emission. The air distribution device can be introduced with tertiary air. The lower parts of the side walls of the hearth, the lower part of the middle wall and the bottom of the hearth can be all provided with air distribution devices. In an optional scheme, air distribution devices can be arranged on the lower portions of the side walls and the middle wall of the hearth, and a water seal tank and a scraper conveyor for discharging ash from the bottom of the hearth are arranged at the bottom of the hearth.
The following exemplifies the technical effects of the embodiments of the present invention.
Because the air distribution device is arranged at the bottom of the hearth or at the lower part of the hearth to supply air to the inside of the hearth, the phenomena of unburned coal powder and fly ash deposition in the hearth of the horizontal boiler are avoided or reduced; in addition, under the condition that tertiary air is introduced through the whole cross section of the bottom of the hearth (not only the length direction of the cross section, but also the width direction of the cross section, and an air distribution device for the tertiary air is arranged), a water seal tank, a scraper machine and the like for discharging ash at the bottom of the horizontal boiler are not required to be arranged, the structure of the boiler is simplified, meanwhile, the sensible heat of pulverized coal combustion fly ash is effectively utilized, and the heat efficiency of the horizontal boiler is improved;
because the air distribution device is arranged at the bottom of the hearth to supply air to the interior of the hearth, during the horizontal movement combustion process of the pulverized coal, part of the unburned pulverized coal cannot be deposited at the bottom of the hearth, the burnout time of the pulverized coal is prolonged, the combustion efficiency of the pulverized coal is improved, and the coal consumption is saved;
the tertiary air is introduced into the whole section of the bottom of the hearth, so that the deep staged combustion or the step-by-step combustion of the pulverized coal is realized, the reduction combustion time and area of the pulverized coal are prolonged, and the conversion tendency of fuel N to NOx is greatly inhibited; the temperature distribution of pulverized coal combustion is between 1000 ℃ and 1200 ℃, so that the generation of thermal NOx is prevented, and the original emission of NOx is greatly reduced;
under the condition that the coal powder is uniformly combusted in the whole space of the hearth and the powder does not sink at the bottom of the hearth, the boiler is easy to enlarge the capacity.
Based on the above, the invention provides a horizontal pulverized coal fired boiler, which comprises a hearth and a tail flue which are connected in sequence, wherein: the hearth is arranged in such a way that flue gas flows horizontally in the hearth; and the bottom of the hearth is provided with a bottom air distribution device.
As shown in fig. 2 or 5, the furnace chamber and the tail flue are arranged side by side, flue gas flow channels of the furnace chamber and the tail flue are horizontally arranged and communicated with each other to form a U shape, and the flow direction of flue gas in the furnace chamber is opposite to the flow direction of flue gas in the tail flue.
Although not shown, the furnace and the tail flue can also be arranged in series, and the flow direction of the flue gas in the furnace is the same as that of the flue gas in the tail flue.
The invention also provides a control method of the horizontal pulverized coal fired boiler, which comprises the following steps: introducing primary air and secondary air into the hearth, wherein the primary air carries pulverized coal to the hearth in a roughly horizontal direction; and introducing tertiary air into the hearth through a bottom air distribution device arranged at the bottom of the hearth.
In the above method, the bottom air distribution device comprises a plurality of air chambers arranged in sequence in a front-rear direction, and the method further comprises the steps of: the air volume of each air chamber is independently controlled. Optionally, the method further comprises the steps of: realize the gradual oxygen supply combustion in the furnace.
The invention also provides a horizontal pulverized coal fired boiler, which comprises a front wall, a middle wall, a rear wall, a hearth side wall, a flue side wall and a ceiling, wherein the boiler is provided with a hearth and a tail flue, and the hearth and the tail flue are communicated through a channel arranged on the middle wall, wherein: the lower parts of the side walls and the middle wall of the hearth are both inclined downwards towards the air distribution plate; and air distribution devices are arranged at the lower parts of the side walls and the middle wall of the hearth. Optionally, the air distribution device is used for introducing tertiary air.
Although embodiments of the present invention have been shown and described, it would be appreciated by those skilled in the art that changes may be made in these embodiments and combinations of elements without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.
Claims (23)
1. The utility model provides a horizontal pulverized coal fired boiler, includes consecutive furnace and afterbody flue, wherein:
the hearth is arranged in such a way that flue gas flows horizontally in the hearth; and is
The bottom of the hearth is provided with a bottom air distribution device.
2. The boiler of claim 1, wherein:
the hearth and the tail flue are arranged side by side, flue gas flow channels of the hearth and the tail flue are horizontally arranged and communicated with each other to form a U shape, and the flow direction of flue gas in the hearth is opposite to that of flue gas in the tail flue.
3. The boiler of claim 2, wherein:
the hearth and the tail flue share one side wall, and the hearth is communicated with the tail flue through an opening in the side wall.
4. The boiler of claim 1, wherein:
the hearth and the tail flue are arranged in series, and the flow direction of the flue gas in the hearth is the same as that of the flue gas in the tail flue.
5. The boiler of claim 1, wherein:
in the flow direction of the flue gas, the flow cross section area of the flue gas in the hearth is gradually increased.
6. The boiler of claim 5, wherein:
the distance between at least a portion of the two side walls of the hearth is gradually increased.
7. The boiler of claim 1, wherein:
the bottom air distribution device is an air distribution plate with an air chamber and an air cap and is used for introducing tertiary air;
the air distribution plate forms at least one part of the bottom of the hearth.
8. The boiler of claim 7, wherein:
the bottom air distribution device is arranged at the bottom of the hearth in the whole length direction.
9. The boiler of claim 8, wherein:
the bottom air distribution device is arranged on the whole cross section of the bottom of the hearth.
10. The boiler of claim 1, wherein:
the bottom air distribution device comprises an air distribution pipe and an air cap arranged on the air distribution pipe and is used for introducing tertiary air.
11. The boiler according to claim 7 or 10, wherein:
the bottom air distribution device is arranged to vertically spray tertiary air upwards.
12. The boiler of claim 1, wherein:
the lower part of the side wall of the hearth, which extends approximately parallel to the flow direction of the flue gas, is inclined inwards towards the bottom of the hearth.
13. The boiler of claim 12, wherein:
and the included angle between the lower part of the side wall and the vertical direction is more than 30 degrees.
14. The boiler of claim 12, wherein:
and a side wall air distribution device is arranged at the lower part of the side wall.
15. The boiler of claim 1, wherein:
the air distribution device is provided with a plurality of air chambers which are sequentially arranged along the front-back direction, and the air volume of each air chamber is suitable for being independently controlled.
16. The boiler according to any one of claims 1-15, wherein:
the hearth is provided with a front wall, the front wall is provided with a primary air port and a secondary air port, and primary air from the primary air port carries pulverized coal to enter the hearth in a roughly horizontal direction.
17. A control method of a horizontal pulverized coal boiler comprises the following steps:
introducing primary air and secondary air into the hearth, wherein the primary air carries pulverized coal to the hearth in a roughly horizontal direction; and
and tertiary air is introduced into the hearth through a bottom air distribution device arranged at the bottom of the hearth.
18. The method of claim 17, wherein:
the bottom air distribution device comprises a plurality of air chambers which are sequentially arranged along the front-back direction,
the method further comprises the steps of: the air volume of each air chamber is independently controlled.
19. The method of claim 17, wherein:
the tertiary air is provided over the entire cross section of the bottom of the furnace.
20. The method of any one of claims 17-19, wherein:
the air for burning the pulverized coal is divided into primary air, secondary air and tertiary air, wherein the primary air accounts for 10-30% of the air quantity for burning, the secondary air accounts for 20-40% of the air quantity for burning, and the tertiary air accounts for 40-60% of the air quantity for burning.
21. The method of claim 20, wherein:
the method further comprises the steps of: the combustion temperature of the pulverized coal in the hearth is controlled between 1000 ℃ and 1200 ℃.
22. The utility model provides a horizontal pulverized coal fired boiler, includes front wall, intermediate wall, back wall, furnace side wall, flue side wall and ceiling, the boiler has furnace and afterbody flue, and communicates through the passageway that sets up on the intermediate wall between furnace and the afterbody flue, wherein:
the lower parts of the side walls and the middle wall of the hearth are both inclined downwards towards the air distribution plate;
and air distribution devices are arranged at the lower parts of the side walls and the middle wall of the hearth.
23. The boiler according to claim 22, wherein:
the air distribution device is used for introducing tertiary air.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111911916A (en) * | 2020-08-14 | 2020-11-10 | 华能国际电力股份有限公司南通电厂 | Center wall type tertiary air system of opposed swirl combustion boiler |
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| CN201621675U (en) * | 2010-04-06 | 2010-11-03 | 山西蓝天环保设备有限公司 | Horizontal type pulverized coal boiler with bend type aftercombustion chamber |
| CN102563627A (en) * | 2012-02-29 | 2012-07-11 | 中国计量学院 | Efficient pulverized coal industrial boiler with low-pollution emission characteristic |
| CN203190629U (en) * | 2013-03-11 | 2013-09-11 | 王民发 | Horizontal-type thermal medium boiler |
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| CN111911916A (en) * | 2020-08-14 | 2020-11-10 | 华能国际电力股份有限公司南通电厂 | Center wall type tertiary air system of opposed swirl combustion boiler |
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