CN107606605B - A kind of W flame boiler using flue gas recycled - Google Patents
A kind of W flame boiler using flue gas recycled Download PDFInfo
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- CN107606605B CN107606605B CN201710817716.4A CN201710817716A CN107606605B CN 107606605 B CN107606605 B CN 107606605B CN 201710817716 A CN201710817716 A CN 201710817716A CN 107606605 B CN107606605 B CN 107606605B
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Abstract
A kind of W flame boiler using flue gas recycled, it is related to a kind of W flame boiler.The present invention solves burnout degree is added using the W flame boiler of vortex burner after, the problem of unburned combustible in fly ash significantly increases.A clearance type flue gas recycled spout vortex burner ipsilateral with it is arranged in a one-to-one correspondence on every group of arch, flue gas recycled bellows, which are located at, on arch encircles upper clearance type flue gas recycled nozzle, air-introduced machine outlet is connected to flue gas recycled general pipeline, one end of flue gas recycled wind box branch pipe is connected to classification wind flue gas recycled branch pipe on arch, the other end of flue gas recycled wind box branch pipe is connected to upper flue gas recycled bellows are encircleed on arch, the connection corresponding with outer second air entrance in vortex burner of the other end of outer second air flue gas recycled branch pipe and inner second air flue gas recycled branch pipe, the other end of classification wind flue gas recycled branch pipe is connected to corresponding classification air hose.The invention belongs to W flame boiler energy-saving emission-reduction technical fields.
Description
Technical field
The present invention relates to a kind of coal-fired flame boilers, and in particular to a kind of W flame boiler using flue gas recycled belongs to
W flame boiler energy-saving emission-reduction technical field.
Background technique
It verifies in coal reserves China is existing, anthracite portion 11.5% is that a small number of smokeless coal reserves are rich in the world
Rich one of country.Anthracite has the characteristics that degree of coalification height and volatile matter content are low, its own is made to be difficult to kindling and after-flame
Performance is poor.W flame boiler is because its lower hearth space is big, temperature is high, flame travel is long and first downlink is returned on then and is conducive to
Fire becomes and uses the preferable type of furnace of anthracite.However, W flame boiler is in actual operation, NOxDischarge amount is higher, wherein rotation
Flow burner W flame boiler NOxOriginal emission is up to 1400mg/m3(6%O2)。
NOxIt is to form one of main matter of acid rain, and form the important substance of photochemical fog and destruction in atmosphere
One key factor of atmospheric ozone layer, meanwhile, NOxSubtle nitrate granules will be formed by being further oxided in an atmosphere,
It is an important factor for causing haze weather.For this purpose, being directed to coal-burning power plant, country, which has put into effect, " implements in full the ultralow row in coal-burning power plant
Put and reducing energy consumption programme of work ", the year two thousand twenty is arrived, coal-burning power plant realizes minimum discharge, wherein NOxConcentration of emission is 50mg/m3
(6%O2).If W flame boiler does not take Mitigation options, it is difficult to meet increasingly harsh environmental requirement.Burnout degree technology conduct
A kind of simple, inexpensive, efficient technology, is widely used in the low NO of W flame boilerxIn transformation.Wherein, spiral-flow powdered coal burning
After device W flame boiler adds burnout degree, boiler NOxDischarge can be greatly lowered, however, since after-flame air quantity accounts for total blast volume
20% or so, after boiler adds burnout degree, so that the classification air quantity of the inside and outside secondary air flow of vortex burner and lower hearth
It reduces, causes the inside and outside Secondary Air of vortex burner and lower hearth to be classified wind undershoot momentum and be greatly lowered, not can guarantee
The undershoot depth of breeze airflow, coal dust are reduced in the lower hearth residence time, and when using anthracite, unburned combustible in fly ash is substantially
Degree increases, and can reach 10% or more.
Currently, flue gas recirculating technique is mainly used for controlling NO in furnacexIt generates, for industrial coal powder furnace: Chinese invention is special
Sharp " a kind of industrial coal powder boiler flue gas recirculation low nitrogen burning method and system " (applying date is July 29, application number in 2016
It is on December 21st, 2016 for 201610614713.6, publication date, calls " file one " in the following text) and a kind of Chinese invention patent " flue gas
Recycle low nitrogen stove " (applying date is on April 1st, 2016, is in August, 2016 application No. is 201620270786.3, publication date
24, call " file two " in the following text), for chain furnace: Chinese invention patent " flue gas recirculation chain furnace and its flue gas recirculation multilayer
Cloth air control preparation method " (applying date is on January 23rd, 2017, is May 17 in 2017 application No. is 201710050149.4, publication date
Day, call " file three " in the following text) and Chinese invention patent " a kind of independent partitions layer burning fume circulating combustion system and its application method "
(applying date is on December 19th, 2016, is on April 26th, 2017 application No. is 201611181583.8, publication date, calls " text in the following text
Part four "), for circulating fluidized bed boiler: (applying date is 2016 years to Chinese invention patent " fluidized-bed combustion boiler low nitrogen combustion apparatus "
December 18, application No. is 201611173000.7, publication date be on May 10th, 2017, call " file five " in the following text), Chinese invention
The patent circulating fluidized bed boiler systems of low-nitrogen oxide discharging " realize " (applying date be on May 27th, 2016, application No. is
201610360176.7, publication date is on July 27th, 2016, calls " file six " in the following text), the above patent of invention is by boiler
Tail portion is extracted a part of low-temperature flue gas and is sent into furnace, and oxygen concentration and ignition temperature in furnace are reduced, and main purpose is drop
NO in low furnacexIt generates, is not directed to reduce unburned combustible in fly ash by flue gas recycled, improve boiler efficiency.Currently,
Patent of invention using the W flame boiler of flue gas recirculation is considerably less, wherein a kind of Chinese invention patent " micro- oxygen-enriched combusting W fire
Flame boiler and CO2Emission-reducing system " (applying date, which is on 2 18th, 2013, application No. is 201310052677.5, publication date is
On May 15th, 2013, call " file seven " in the following text) and Chinese invention patent " a kind of oxygen-enriched combusting W flame boiler system and its burner
Skill " (applying date is on December 11st, 2012, application No. is 201210531793.0, publication date is on April 3rd, 2013, is called in the following text
" file eight ") it discloses a kind of air into furnace and is substituted for reducing CO by flue gas recycled blending pure oxygen2The side of discharge
Method is also not directed to reduce unburned combustible in fly ash by flue gas recycled, improves boiler efficiency.
" file one " non-W flame boiler into " file six ", but other type of furnaces (such as: industrial coal powder furnace, chain furnace and
Circulating fluidized bed boiler) lignite and bituminous coal mainly are used, compared with anthracite, lignite and bituminous coal carbonizing degree are low, and volatile matter contains
Amount is high, and after-flame degree is high, so, other type of furnaces are for reducing NO in furnace using flue gas recycled main purposexIt generates,
It is not directed to boiler efficiency be improved, so the flue gas recycled system of other type of furnaces can not for reducing unburned combustible in fly ash
Applied to W flame boiler.
Studies have shown that the undershoot depth of breeze airflow is affected to W flame boiler coal-ash after-flame degree.Under breeze airflow
Scouring depth degree is bigger, and pulverized coal particle is longer in the residence time of lower hearth, and lower hearth pulverized coal flame degree of filling and coal dust burnout rate are equal
It improves.In addition, breeze airflow undershoot depth is bigger, recirculating zone is bigger under encircleing, and is back to the high-temperature flue gas of arch burner region
Amount is more, is more advantageous to First air breeze airflow and catches fire in time, is conducive to coal dust after-flame.
Summary of the invention
The present invention is unburned combustible in fly ash after solving to add burnout degree using the W flame boiler of vortex burner
The problem of significantly increasing, and then a kind of W flame boiler using flue gas recycled is provided.
The technical solution adopted by the present invention to solve the above technical problem is:
W flame boiler using flue gas recycled of the invention, the W flame boiler include lower hearth 1, upper furnace 2, furnace
Arch 3 and multiple vortex burners 4, multiple vortex burners 4 are distributed along furnace chamber width in "-" type, and multiple
Vortex burner 4 is symmetrically arranged in the two sides of chimney arch 3, and the lower end of vortex burner 4 is successively set from inside to outside
It is equipped with a wind snout 5, inner second air spout 6 and outer second air spout 7, the W flame boiler further includes multiple lack of gas air hoses
8, multiple classification air hoses 9 and multiple fire air nozzles 10, lack of gas air hose 8 and classification air hose 9 are symmetricly set on the front and back side of chimney arch 3
On wall, lack of gas air hose 8 and classification air hose 9 vortex burner about 4 ipsilateral with it are arranged in a one-to-one correspondence, fire air nozzle
10 are located at the intersection of lower hearth 1 and upper furnace 2；The W flame boiler further includes flue gas recycled system, flue gas recycled system
System includes clearance type flue gas recycled spout 11 on multiple arches, flue gas recycled bellows 12 on arch, flue gas recycled general pipeline 14, outside
Flue gas recycled wind box branch pipe 19 on Secondary Air flue gas recycled branch pipe 17 and inner second air flue gas recycled branch pipe 18, arch, point
Grade wind flue gas recycled branch pipe 20, air-introduced machine 13, flowmeter 15 and valve 16；Clearance type flue gas recycled spout 11 is vertical on arch
The two sides of chimney arch 3 and front wall 21 and the arrangement of rear wall 22 close to boiler are set, and every 12 encircle upper clearance type flue gas recycled
Spout 11 is one group, and clearance type flue gas recycled spout 11 vortex burner 4 ipsilateral with it be one by one on every group of arch
It is correspondingly arranged, flue gas recycled bellows 12, which are located at, on arch encircles at upper clearance type flue gas recycled spout 11, and air-introduced machine 13 is from boiler
Tail portion introduce flue gas recycled, air-introduced machine 13 outlet be connected to flue gas recycled general pipeline 14, flue gas recycled general pipeline 14 respectively with
Outer second air flue gas recycled branch pipe 17, inner second air flue gas recycled branch pipe 18 and be classified wind flue gas recycled branch pipe 20 one
End is connected to, and one end of flue gas recycled wind box branch pipe 19 is connected to classification wind flue gas recycled branch pipe 20 on arch, is recycled on arch
The other end of flue gas wind box branch pipe 19 is connected to upper flue gas recycled bellows 12 are encircleed, outer second air flue gas recycled branch pipe 17 and interior
The connection corresponding with outer second air entrance in vortex burner 4 of the other end of Secondary Air flue gas recycled branch pipe 18, is classified wind
The other end of flue gas recycled branch pipe 20 is connected to corresponding classification air hose 9.
Further, lack of gas wind snout 8 and classification wind snout 9 have a down dip arrangement.
Further, fire air nozzle 10 has a down dip arrangement.
Further, outer second air flue gas recycled branch pipe 17, inner second air flue gas recycled branch pipe 18, arch on recycle
Flowmeter 15 and valve 16 are provided on flue gas wind box branch pipe 19 and classification wind flue gas recycled branch pipe 20.
Further, the flue gas recycled wind speed of clearance type flue gas recycled spout 11 is 40~45m/s on arch.
Further, outer second air flue gas recycled branch pipe 17, inner second air flue gas recycled branch pipe 18 and classification wind again
The top of circulating flue gas branch pipe 20 is vertically arranged, outer second air flue gas recycled branch pipe 17, inner second air flue gas recycled branch
Flowmeter 15 on pipe 18 and classification wind flue gas recycled branch pipe 20 is located at the top of corresponding valve 16, each branch pipe flow meter
15 be five times of branch pipe diameter at a distance from valve 16.
Further, flue gas recycled wind box branch pipe 19 is horizontally disposed on arch.
The beneficial effects of the present invention are:
After the inside and outside Secondary Air of vortex burner of the present invention and classification wind blending flue gas recycled, so that rotational flow coal dust
The undershoot momentum of the inside and outside Secondary Air of burner and classification wind increases considerably, and the inside and outside Secondary Air of burner and classification wind carry coal
Powder down washing depth increases, and pulverized coal particle is elongated in the lower hearth residence time, is conducive to after-flame；Flue gas recycled also passes through increasing
If arch on clearance type spout spray into furnace in, muzzle velocity within the scope of 40~45m/s, static pressure difference effect under, the combustion of low speed
Burner breeze airflow carries downlink by encircleing the further injection of high speed flue gas recycled that upper clearance type spout sprays, to make coal dust
Depth increase is penetrated under particle, further improves coal dust after-flame；The flue gas recycled sprayed into furnace by encircleing upper clearance type spout
Pulverized coal particle can also effectively be obstructed to be thrown on forward and backward wall water-cooling wall, effectively prevent forward and backward wall water-cooling wall slagging and high temperature rotten
Erosion；It is disposed with the turbulent burner W flame boiler of burnout degree after applying the present invention, breeze airflow undershoot depth increases considerably,
Encircle lower recirculating zone to increase, the high-temperature flue gas amount for being back to arch burner region increases, and it is timely to be conducive to First air breeze airflow
Kindling, is conducive to coal dust after-flame.
For the present invention under the premise of guaranteeing coal dust after-flame, burnout degree not only increases furnace air hierarchical level, reduces
NOx is generated in furnace, meanwhile, flue gas recycled can reduce in-furnace temperature to a certain extent, and NOx generation further decreases in furnace,
Finally emission of NOx of boiler is greatly lowered, while flue gas recycled can effectively prevent forward and backward wall water-cooling wall slagging and height
Temperature corrosion.
Detailed description of the invention
Fig. 1 is the W flame boiler combustion system arrangement schematic diagram of the invention using flue gas recycled；
The A direction view of Fig. 2 Fig. 1.
Specific embodiment
Specific embodiment 1: as shown in Fig. 1~2, present embodiment includes using the W flame boiler of flue gas recycled
Lower hearth 1, upper furnace 2, chimney arch 3 and multiple vortex burners 4, multiple vortex burners 4 are along furnace chamber width
It is distributed in "-" type, and multiple vortex burners 4 are symmetrically arranged in the two sides of chimney arch 3, vortex burner 4
Lower end is disposed with a wind snout 5, inner second air spout 6 and outer second air spout 7, the W flame boiler from inside to outside
It further include multiple lack of gas air hoses 8, multiple classification air hoses 9 and multiple fire air nozzles 10, lack of gas air hose 8 and classification air hose 9 are symmetrical
It is arranged on the front-rear side walls of chimney arch 3, lack of gas air hose 8 and classification air hose 9 vortex burner about 4 ipsilateral with it are one by one
It is correspondingly arranged, fire air nozzle 10 is located at the intersection of lower hearth 1 and upper furnace 2；The W flame boiler further includes recycling cigarette
Gas system, flue gas recycled system include clearance type flue gas recycled spout 11 on multiple arches, flue gas recycled bellows 12 on arch,
It is followed again on flue gas recycled general pipeline 14, outer second air flue gas recycled branch pipe 17 and inner second air flue gas recycled branch pipe 18, arch
Ring flue gas wind box branch pipe 19, classification wind flue gas recycled branch pipe 20, air-introduced machine 13, flowmeter 15 and valve 16；Clearance type on arch
Flue gas recycled spout 11 is vertically set on the front wall 21 of the two sides of chimney arch 3 and close boiler and rear wall 22 is arranged, and every 12
Clearance type flue gas recycled spout 11 is one group on arch, clearance type flue gas recycled spout 11 is ipsilateral with it on every group of arch one
Vortex burner 4 is arranged in a one-to-one correspondence, and flue gas recycled bellows 12, which are located at, on arch encircles upper clearance type flue gas recycled spout
At 11, air-introduced machine 13 introduces flue gas recycled from boiler tail, and the outlet of air-introduced machine 13 is connected to flue gas recycled general pipeline 14, then is followed
Ring flue gas general pipeline 14 respectively with outer second air flue gas recycled branch pipe 17, inner second air flue gas recycled branch pipe 18 and classification wind again
One end of circulating flue gas branch pipe 20 is connected to, one end of flue gas recycled wind box branch pipe 19 and classification wind flue gas recycled branch pipe on arch
20 are connected to, and the other end of flue gas recycled wind box branch pipe 19 is connected to upper flue gas recycled bellows 12 are encircleed on arch, and outer second air is again
The other end of circulating flue gas branch pipe 17 and inner second air flue gas recycled branch pipe 18 enters with outer second air in vortex burner 4
The corresponding connection of mouth, the other end of classification wind flue gas recycled branch pipe 20 are connected to corresponding classification air hose 9.
Specific embodiment 2: the cloth as shown in Figure 1, present embodiment lack of gas wind snout 8 and classification wind snout 9 have a down dip
It sets.So set, adjusting furnace flame center and thermo parameters method for changing the incident angle of wind.It is other composition and
Connection relationship is same as the specific embodiment one.
Specific embodiment 3: the arrangement as shown in Figure 1, present embodiment fire air nozzle 10 has a down dip.So set, with
In the incident angle for changing wind, furnace flame center and thermo parameters method are adjusted.Other compositions and connection relationship and specific
Embodiment one or two is identical.
Specific embodiment 4: as shown in Figure 1, present embodiment outer second air flue gas recycled branch pipe 17, inner second air
Stream is provided on flue gas recycled wind box branch pipe 19 and classification wind flue gas recycled branch pipe 20 on flue gas recycled branch pipe 18, arch
Meter 15 and valve 16.It is designed in this way, passes through following again for each flue gas recycled branch pipe of the aperture reasonable distribution of control valve 16
Ring exhaust gas volumn, flowmeter 15 are used to measure the flue gas flow of each flue gas recycled branch pipe.Other compositions and connection relationship and tool
Body embodiment three is identical.
Specific embodiment 5: as shown in Figure 1, present embodiment encircles the recycling of upper clearance type flue gas recycled spout 11
Flue gas wind speed is 40~45m/s.It is designed in this way, under static pressure difference effect, the burner breeze airflow of low speed is by encircleing upper clearance type
The further injection of the high speed flue gas recycled that spout sprays carries downlink, to penetrate depth increase under making pulverized coal particle, further
Improve coal dust after-flame.Other compositions and connection relationship are the same as the specific implementation mode 1,2 or 4.
Specific embodiment 6: as shown in Figure 1, present embodiment outer second air flue gas recycled branch pipe 17, inner second air
The top of flue gas recycled branch pipe 18 and classification wind flue gas recycled branch pipe 20 is vertically arranged, outer second air flue gas recycled branch
Flowmeter 15 on pipe 17, inner second air flue gas recycled branch pipe 18 and classification wind flue gas recycled branch pipe 20 is located at corresponding valve
16 top, each branch pipe flow meter 15 are five times of branch pipe diameter at a distance from valve 16.Other compositions and connection relationship
It is identical as specific embodiment four.
Specific embodiment 7: as shown in Figure 1, the upper flue gas recycled wind box branch pipe 19 of present embodiment arch is horizontally disposed.
Other compositions and connection relationship are identical as specific embodiment four or six.
Claims (7)
1. a kind of W flame boiler using flue gas recycled, the W flame boiler includes lower hearth (1), upper furnace (2), chimney arch
(3) it is distributed along furnace chamber width in "-" type with multiple vortex burners (4), multiple vortex burners (4), and
Multiple vortex burners (4) are symmetrically arranged in the two sides of chimney arch (3), and the lower end of vortex burner (4) is by interior
It is disposed with a wind snout (5), inner second air spout (6) and outer second air spout (7) outward, the W flame boiler is also
Including multiple lack of gas air hoses (8), multiple classification air hoses (9) and multiple fire air nozzles (10), lack of gas air hose (8) and classification air hose
(9) it is symmetricly set on the front-rear side walls of chimney arch (3), lack of gas air hose (8) and classification air hose (9) rotational flow coal dust ipsilateral with it fire
Burner (4) is arranged in a one-to-one correspondence up and down, and fire air nozzle (10) is located at the intersection of lower hearth (1) and upper furnace (2)；Its feature
Be: the W flame boiler further includes flue gas recycled system, and flue gas recycled system includes clearance type recycling on multiple arches
Flue gas recycled bellows (12), flue gas recycled general pipeline (14), outer second air flue gas recycled branch pipe on flue gas spout (11), arch
(17) flue gas recycled wind box branch pipe (19), classification wind flue gas recycled and on inner second air flue gas recycled branch pipe (18), arch
Branch pipe (20), air-introduced machine (13), flowmeter (15) and valve (16)；Clearance type flue gas recycled spout (11) is vertically arranged on arch
Two sides in chimney arch (3) and the front wall (21) close to boiler and rear wall (22) arrangement, every 12 encircle upper clearance type and recycle cigarette
Gas blowout mouth (11) is one group, clearance type flue gas recycled spout (11) vortex burner ipsilateral with it on every group of arch
(4) it is arranged in a one-to-one correspondence, flue gas recycled bellows (12), which are located at, on arch encircles at upper clearance type flue gas recycled spout (11), air inducing
Machine (13) introduces flue gas recycled from boiler tail, and air-introduced machine (13) outlet is connected to flue gas recycled general pipeline (14), recycles
Flue gas general pipeline (14) respectively with outer second air flue gas recycled branch pipe (17), inner second air flue gas recycled branch pipe (18) and classification
One end of wind flue gas recycled branch pipe (20) is connected to, one end of flue gas recycled wind box branch pipe (19) and classification wind recycling on arch
Flue gas branch pipe (20) is connected to, and the other end of flue gas recycled wind box branch pipe (19) and arch upper flue gas recycled bellows (12) connect on arch
Logical, the other end and rotational flow coal dust of outer second air flue gas recycled branch pipe (17) and inner second air flue gas recycled branch pipe (18) fire
The corresponding connection of the interior outer second air entrance of burner (4) is classified the other end of wind flue gas recycled branch pipe (20) and corresponding classification wind
Manage (9) connection.
2. the W flame boiler according to claim 1 using flue gas recycled, it is characterised in that: lack of gas wind snout and point
Grade wind snout has a down dip arrangement.
3. the W flame boiler according to claim 1 or 2 using flue gas recycled, it is characterised in that: fire air nozzle
(10) have a down dip arrangement.
4. the W flame boiler according to claim 3 using flue gas recycled, it is characterised in that: outer second air recycling
Flue gas branch pipe (17), inner second air flue gas recycled branch pipe (18), flue gas recycled wind box branch pipe (19) and classification wind is again on arch
Flowmeter (15) and valve (16) are provided on circulating flue gas branch pipe (20).
5. the W flame boiler according to claim 1,2 or 4 using flue gas recycled, it is characterised in that: clearance type on arch
The flue gas recycled wind speed of flue gas recycled spout (11) is 40~45m/s.
6. the W flame boiler according to claim 4 using flue gas recycled, it is characterised in that: outer second air recycling
The top of flue gas branch pipe (17), inner second air flue gas recycled branch pipe (18) and classification wind flue gas recycled branch pipe (20) is vertical
Setting, outer second air flue gas recycled branch pipe (17), inner second air flue gas recycled branch pipe (18) and classification wind flue gas recycled
Flowmeter (15) on branch pipe (20) is located at the top of corresponding valve (16), each branch pipe flow meter (15) and valve (16)
Distance is five times of branch pipe diameter.
7. using the W flame boiler of flue gas recycled according to claim 4 or 6, it is characterised in that: recycle cigarette on arch
Gas wind box branch pipe (19) is horizontally disposed.
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| CN201710817716.4A CN107606605B (en) | 2017-09-12 | 2017-09-12 | A kind of W flame boiler using flue gas recycled |
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| CN107606605B true CN107606605B (en) | 2019-04-09 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109945164B (en) * | 2019-03-11 | 2019-11-05 | 哈尔滨工业大学 | A kind of W flame boiler preventing fluid field in furnace deflection using flue gas recycled |
| CN111207386A (en) * | 2020-01-16 | 2020-05-29 | 吉林宏日新能源股份有限公司 | Low-nitrogen biomass combustion method and biomass hot blast stove |
| CN111457360B (en) * | 2020-03-16 | 2021-05-04 | 哈尔滨工业大学 | W flame boiler with anti-slagging air |
| CN113531520A (en) * | 2021-08-02 | 2021-10-22 | 国能南京电力试验研究有限公司 | W flame boiler suitable for difficult-to-burn coal and easy-to-burn coal and adjusting method thereof |
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| JPH01127807A (en) * | 1987-11-13 | 1989-05-19 | Babcock Hitachi Kk | Solid fuel combustion equipment |
| CN203517848U (en) * | 2013-09-30 | 2014-04-02 | 烟台龙源电力技术股份有限公司 | Boiler tail gas recirculator, flue gas system and boiler |
| CN106247322A (en) * | 2016-07-28 | 2016-12-21 | 哈尔滨工业大学 | The W flame boiler that a kind of weary gas windage yaw is put |
| CN106524137A (en) * | 2016-10-26 | 2017-03-22 | 哈尔滨工业大学 | Multi-injection staged W flame boiler using swirl pulverized coal burner |
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