CN210891768U - Atmospheric hot water stove with staged combustion - Google Patents
Atmospheric hot water stove with staged combustion Download PDFInfo
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- CN210891768U CN210891768U CN201921855272.4U CN201921855272U CN210891768U CN 210891768 U CN210891768 U CN 210891768U CN 201921855272 U CN201921855272 U CN 201921855272U CN 210891768 U CN210891768 U CN 210891768U
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 250
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000003245 coal Substances 0.000 claims abstract description 131
- 239000003546 flue gas Substances 0.000 claims abstract description 86
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 84
- 239000004484 Briquette Substances 0.000 claims abstract description 10
- 238000000197 pyrolysis Methods 0.000 claims description 37
- 238000002309 gasification Methods 0.000 claims description 32
- 229910052760 oxygen Inorganic materials 0.000 claims description 28
- 239000001301 oxygen Substances 0.000 claims description 28
- 239000000779 smoke Substances 0.000 claims description 26
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 23
- 238000005192 partition Methods 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 abstract description 10
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052717 sulfur Inorganic materials 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 7
- 239000006229 carbon black Substances 0.000 abstract description 5
- 239000004744 fabric Substances 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 239000002802 bituminous coal Substances 0.000 description 7
- 238000000926 separation method Methods 0.000 description 6
- 238000010411 cooking Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 5
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000000571 coke Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 206010021143 Hypoxia Diseases 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003344 environmental pollutant Substances 0.000 description 3
- 230000009970 fire resistant effect Effects 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004939 coking Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 1
- 239000010883 coal ash Substances 0.000 description 1
- 239000011280 coal tar Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- 208000018875 hypoxemia Diseases 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229910052815 sulfur oxide Inorganic materials 0.000 description 1
- 239000011269 tar Substances 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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Abstract
The utility model provides a normal pressure hot water stove with staged combustion, which comprises a hearth, wherein the hearth is divided into a main combustion area and a heat exchange area which are communicated, coal is combusted in the main combustion area after entering the hearth, and the flue gas generated by combustion carries out heat exchange in the heat exchange area; the bottom of the main combustion area is provided with an air distribution plate which is tightAt least two independent wind chambers are arranged below the cloth pasting wind plate, air is supplied to the main combustion area through the wind chambers to assist the combustion of coal, independent wind shields are arranged at air inlets of the wind chambers, and the air inlet ratio of the corresponding wind chambers is controlled by adjusting the opening of the wind shields, so that the combustion atmosphere of different zones in the main combustion area is adjusted. The utility model discloses an improve the cloth wind method, further optimize the fractional combustion, reach the control through burning atmosphere and reduce NOxImproving the sulfur fixation rate of the briquette and reducing the discharge of carbon black.
Description
Technical Field
The utility model belongs to the technical field of combustion apparatus, a ordinary pressure hot water stove is related to, especially relate to a ordinary pressure hot water stove of hierarchical burning.
Background
The civil coal-fired stove mainly refers to a household small-sized coal-fired stove which takes bulk coal as fuel (including bituminous coal and anthracite) and takes cooking or heating as the purpose; the civil coal-fired stove also comprises a stove using honeycomb briquette and coal balls as fuel.
Currently, there are two main types of civil stoves on the market:
the direct-fired stove is the simplest and most common direct-fired mode of tradition, and flame spreads along with hot flue gas natural flow direction during solid fuel burning, and combustion strength is high, and the firepower is flourishing, can satisfy user's cooking demand. The normal combustion furnace is suitable for fuels with low volatile components such as anthracite and the like. Although the forward combustion furnace has good cooking capability, when bituminous coal or molded coal prepared by using bituminous coal as a raw material is used, the temperature is raised by heating after the bituminous coal is added, volatile matters are analyzed and immediately discharged along with flue gas, and the volatile matters are difficult to burn out, so that a large amount of black smoke (tar, CO, VOC, oxides of sulfur and nitrogen and the like) is emitted, and the environment is seriously polluted. In addition, when the normal combustion furnace is used for heating, frequent coal feeding is needed, the combustion intensity and pollutant discharge are greatly changed during coal feeding, and the normal combustion furnace has strong instability and periodicity.
The back-burning furnace is a combustion mode that flame is spread against the natural flow direction of hot flue gas when solid fuel is combusted, has the characteristics of capability of delaying the extraction speed of volatilization analysis, high furnace temperature, full combustion, capability of basically eliminating black smoke and low emission concentration of particulate matters, is suitable for fuels with high volatile components such as bituminous coal and the like, and is suitable for heating. However, the intensity of the back-fire combustion is high and the temperature of the combustion zone is high, resulting in high concentrations of SO2 and NOx emissions. In order to effectively eliminate smoke, the reverse combustion furnace mostly adopts a multi-return flue, so that the cooking firepower is weak, the reverse combustion furnace is not suitable for cooking, only can be used for heating, and is difficult to be accepted by most common people.
A large number of experimental researches show that the civil stoves on the market all have the defects of strong stove combustion periodicity, difficult load adjustment, short fire banking time, large coal consumption and the like. Whether the furnace is a normal combustion furnace or a reverse combustion furnace, the temperature can be rapidly increased after coal is added, volatile components are rapidly separated out, and a large amount of sulfur and nitrogen oxides are rapidly separated out and discharged.
The stove is not matched with the raw material coal, so that the combustion temperature and the excess air coefficient of a hearth are overhigh, the hearth coking frequently occurs to influence the normal use, and NO is addedxThe emission concentration is increased and is not beneficial to the self-sulfur-fixing of coal ash or the sulfur-fixing of added sulfur-fixing agent in the combustion process in the furnace. Bituminous coal with high volatile content (Vdaf is more than 15 percent) is combusted in a traditional normal combustion furnace, and a large amount of black smoke is emitted; burning in the back-burning furnace can make in furnace and the afterbody flue have a large amount of coal tar to adhere to, causes the flue to block up when influencing the heat transfer effect, influences the ventilation, is difficult to wash.
CN109578976A discloses a grate-fired boiler, which comprises a first cavity and a second cavity communicated with each other at the bottom in the boiler body; a coal feeding port is arranged at the top of the first cavity, a pre-combustion air port is formed in the middle furnace wall of the first cavity, and/or a pre-combustion air pipe is arranged in the middle of the first cavity, the area above the pre-combustion air port and/or the pre-combustion air pipe in the first cavity is a dry distillation pyrolysis area, and the area below the pre-combustion air port and/or the pre-combustion air pipe is a semicoke reduction pre-combustion area; a first chain grate is arranged at the lower parts of the first cavity and the second cavity, and a space for material circulation is reserved between the first cavity and the first chain grate and between the second cavity and the first chain grate; a steam pocket is arranged at the top of the second cavity, a rear arch is arranged below the steam pocket on the furnace wall of the second cavity, a flue gas circulation area is formed at the upper part of the first chain grate, and a burnout air port is arranged at the upper part of the flue gas circulation area; at least 2 air chambers are arranged below the first traveling grate, and a gap is reserved between the first traveling grate and the furnace wall of the second cavity.
CN205065702U discloses an over-fire air device for tangential boiler air staged combustion vertical and horizontal combined arrangement, which comprises a hearth, a hot air box, a pulverized coal pipeline, a primary air nozzle, a secondary air nozzle, a compact over-fire air nozzle, a corner separation over-fire air nozzle and a wall type separation over-fire air nozzle; the hearth is sequentially divided into a main burning area, a reduction area and a burnout area from bottom to top, a primary air nozzle, a secondary air nozzle and a compact burnout air nozzle are all arranged on the furnace wall of the main burning area of the hearth, corner separation burnout air nozzles are arranged at the corners of the burnout area of the hearth, and wall separation burnout air nozzles are arranged on the furnace wall of the burnout area of the hearth; the outlet of the hot air box is divided into multiple paths, wherein the first path is connected with the inlet of a secondary air nozzle of the main combustion area, the second path is connected with the inlet of a compact over-fire air nozzle, the third path is connected with the inlet of a corner separation over-fire air nozzle, and the fourth path is connected with the inlet of a wall separation over-fire air nozzle; the outlet of the coal powder pipeline is connected with the coal powder inlet of the primary air nozzle.
CN107238111A discloses a coal-fired heating stove, wherein a coal feeding port is arranged on one side of the top of a main body of the coal-fired heating stove, and a chimney is arranged on one side of the top of the main body of the coal-fired heating stove, which is opposite to the coal feeding port; the upper part in the coal-fired heating stove main body is vertically provided with a water jacket clapboard with the upper part in the coal-fired heating stove main body being a dry distillation pyrolysis zone connected with a coal feeding port and a flue gas burnout heat exchange zone connected with a chimney; the lower area of the water jacket clapboard in the coal-fired heating furnace main body is a semicoke combustion area; the lower part of the semicoke combustion area is obliquely provided with a grate, and a primary air port is arranged below the grate; a secondary air port is arranged at the joint of the semicoke combustion area and the flue gas burnout heat exchange area; and a heating water heat exchange pipe is arranged in the flue gas burnout heat exchange area.
However, staged burners have been designed primarily for burning loose coal. Because the size of the loose coal is not uniform and the gaps between coal particles/blocks are small, the height of the furnace body is low, the heat intensity of a semicoke combustion area is high, the combustion temperature is up to more than 1300 ℃, although smoke abatement and coke burnout are facilitated, the trend of generating nitrogen oxides by semicoke nitrogen is increased to a certain extent, and the NO is counteracted by staged combustionxThe emission reduction function of the composition.
If the molded coal is used as fuel in the staged combustion furnace, the molded coal has regular shape and large void ratio, the pyrolysis gasification area is easy to overheat, and the coal layer on the coal feeding side is completely combusted (burnt through) to lose the difference between the pyrolysis gasification area and the combustion area, so that the function of staged combustion for removing nitrogen oxides cannot be realized, and instability (or periodicity) of combustion and pollutant discharge caused by operations such as coal feeding, slag discharging and the like of the furnace is also caused. In addition, in order to improve the burn-out rate, the combustion intensity of the combustion zone is high, the temperature is high, and when low-melting-point bituminous coal is used, the coking is easy to occur, so that the normal use of the furnace is influenced. Because the combustion temperature of the combustion area is high, when the high-sulfur coal with the sulfur fixing agent is used as the raw material of the molded coal, the sulfur fixing effect of the molded coal is poor, and the purpose of low sulfur emission during the combustion of the high-sulfur coal is difficult to achieve. It can be seen that the existing staged combustion furnace has little effect on reducing pollutant emission, and because pyrolysis gas easily affects the combustion atmosphere of the combustion zone when passing through the combustion zone, the combustion zone is easily coked, and the combustion cannot be continuously and stably carried out.
SUMMERY OF THE UTILITY MODEL
Not enough to prior art exists, the utility model aims to provide a normal pressure hot water stove of fractional combustion, the utility model discloses an improve the cloth wind method, further optimize the fractional combustion, reach through the control of burning atmosphere and reduce NOxImproved typeThe sulfur fixation rate of coal and the reduction of carbon black emission.
To achieve the purpose, the utility model adopts the following technical proposal:
in a first aspect, the normal pressure hot water stove comprises a hearth, the hearth is divided into a main combustion area and a heat exchange area which are communicated, coal is combusted in the main combustion area after entering the hearth, and heat exchange is carried out on flue gas generated by combustion in the heat exchange area.
The air distribution plate is arranged at the bottom of the main combustion area, the at least two air chambers which are mutually independent are arranged under the air distribution plate in a close fit manner, air is supplied to the main combustion area through the air chambers to assist the combustion of coal, the independent air baffles are arranged at the air inlets of the air chambers, and the air inlet ratio of the corresponding air chambers is controlled by adjusting the opening of the air baffles, so that the share distribution and the thermal environment of different partitions in the main combustion area are adjusted.
The utility model discloses an improve the cloth wind method, further optimize the fractional combustion, reach the control through burning atmosphere and reduce NOxImproving the sulfur fixation rate of the briquette and reducing the discharge of carbon black.
As an optimal technical scheme of the utility model, main combustion area divide into pyrolysis gasification district, low temperature combustion district, high temperature combustion district and oxygen boosting burn-out district along moulded coal direction of delivery.
The briquette firstly enters a pyrolysis gasification zone, is dried and pyrolyzed under the condition of oxygen deficiency, part of the briquette is separated out and volatile components are changed into coke, then the coke enters a low-temperature combustion zone, under the condition of low temperature and oxygen deficiency and in a reducing atmosphere, part of nitrogen in the volatile components is converted into nitrogen, and the other part of nitrogen is converted into NH3The HCN form is released. The coke after pyrolysis gasification moves to a high-temperature combustion area to be burnt out under external mechanical force. The reducing flue gas generated by pyrolysis gasification and the semicoke layer of a combustion zone (comprising a low-temperature combustion zone and a high-temperature combustion zone) enable NO to be generatedxReduction to harmless N2、CO2And H2And O. In the oxygen-enriched reburning area, the over-fire air is used for burning off CO and soot.
As an optimized technical scheme of the utility model, hug closely the air distribution plate below and be provided with two mutually independent plenums, through the plenum helps the coal burning to main combustion area air supply.
The two air chambers are respectively marked as a primary air chamber and a secondary air chamber along the conveying direction of the molded coal, primary air is conveyed into the corresponding main combustion area through the primary air chamber, and secondary air is conveyed into the corresponding main combustion area through the secondary air chamber.
The corresponding part of the air distribution plate above the primary air chamber is a primary air distribution plate, one part of the primary air distribution plate is positioned in the pyrolysis gasification area, the other part of the primary air distribution plate is positioned in the low-temperature combustion area, air holes are not formed in the part of the primary air distribution plate positioned in the pyrolysis gasification area, and air holes are formed in the part of the primary air distribution plate positioned in the low-temperature combustion area.
The corresponding part of the air distribution plate above the secondary air chamber is a secondary air distribution plate, the secondary air distribution plate is provided with air holes, one part of the secondary air distribution plate is positioned in a high-temperature combustion area, the other part of the secondary air distribution plate is positioned in an oxygen-enriched burnout area, and a burnout air pipe is arranged above the part of the secondary air distribution plate positioned in the oxygen-enriched burnout area.
As an optimized technical scheme, the air intake of primary plenum be provided with the primary air baffle that can open and shut, the air intake of secondary plenum be provided with the overgrate air baffle that can open and shut, the intake ratio of the aperture control primary air and overgrate air through adjusting primary air baffle and overgrate air baffle.
Aiming at the existing normal-pressure hot water stove, a traditional air chamber is optionally divided into two independent small air chambers, the proportion of primary air and secondary air is adjusted by adjusting the opening degrees of a primary air baffle and a secondary air baffle, and the share distribution, the thermal environment and the combustion atmosphere of a low-temperature combustion area and a high-temperature combustion area are controlled, so that the NO is reducedxThe purpose of (1).
As an optimized technical scheme of the utility model, hug closely the air distribution plate below and set up mutually independent three plenum, through the plenum helps the burning of coal to main combustion area air supply.
The three air chambers are respectively marked as a primary air chamber, a secondary air chamber and a tertiary air chamber along the conveying direction of the molded coal, primary air is conveyed to the corresponding main combustion area through the primary air chamber, secondary air is conveyed to the corresponding main combustion area through the secondary air chamber, and tertiary air is conveyed to the corresponding main combustion area through the tertiary air chamber.
The corresponding part of the air distribution plate above the primary air chamber is a primary air distribution plate, one part of the primary air distribution plate is positioned in the pyrolysis gasification area, the other part of the primary air distribution plate is positioned in the low-temperature combustion area, air holes are not formed in the part of the primary air distribution plate positioned in the pyrolysis gasification area, and air holes are formed in the part of the primary air distribution plate positioned in the low-temperature combustion area.
The corresponding part of the air distribution plate above the secondary air chamber is a secondary air distribution plate, the corresponding main combustion area of the secondary air distribution plate is a high-temperature combustion area, and the secondary air distribution plate is provided with air holes.
The air distribution plate corresponding to the upper part of the tertiary air chamber is a tertiary air distribution plate, the main combustion area corresponding to the tertiary air distribution plate is an oxygen-enriched combustion area, air holes are formed in the tertiary air distribution plate, and a combustion air pipe is arranged above the tertiary air distribution plate.
As an optimized technical scheme, the air intake of primary plenum be provided with the primary air baffle that can open and shut, the air intake of secondary plenum be provided with the overgrate air baffle that can open and shut, the air intake of tertiary plenum be provided with the tertiary air baffle that can open and shut, the air inlet volume proportion of aperture control primary air, overgrate air and tertiary air through adjusting primary air baffle, overgrate air baffle and tertiary air baffle.
Aiming at the existing normal-pressure hot water stove, a traditional air chamber is optionally divided into three independent small air chambers, the proportion of primary air and secondary air is adjusted by adjusting the opening degrees of a primary air baffle and a secondary air baffle, and the share distribution, the thermal environment and the combustion atmosphere of a low-temperature combustion area and a high-temperature combustion area are controlled, so that the NO is reducedxThe purpose of (1). By controlling the opening of the tertiary air baffle, an oxygen-enriched high-temperature combustion environment is created, and the molded coal is burnt out on the tertiary air distribution plate. By controlling the share distribution, the thermal environment and the combustion atmosphere of the low-temperature combustion area and the high-temperature combustion area, the combustion temperature of the low-temperature combustion area and the high-temperature combustion area is reduced and the combustion temperature of the molded coal is improved under the condition of ensuring the complete combustion of the molded coalSulfur fixation rate to reduce SO2The purpose of discharging.
As an optimal technical scheme, main burning zone and heat transfer district pass through flue gas burnout passageway intercommunication, the flue gas passes the flue gas after burning out passageway and enters the heat transfer district through main burning zone.
The flue gas inlet of the flue gas burnout channel is of a necking structure.
And a flue gas inlet of the flue gas burnout channel is provided with a burnout air pipe.
And a refractory layer is paved on the inner wall of the flue gas burnout channel.
Under the condition that primary air and secondary air are fully distributed in a grading manner, the flue gas burnout channel is designed to be of a throat structure, air is supplemented from two sides of the throat, the air speed of the burnout air is increased, the uniform mixing degree of heat flow flue gas and air is improved, a fire-resistant layer is laid on the inner wall of the flue gas burnout channel to form a partial heat insulation area, the temperature of the burnout air area is guaranteed to be above 650 ℃, and the purposes of further eliminating smoke and removing carbon black are achieved.
As an optimized technical scheme of the utility model, the heat transfer district top set up the exhanst gas outlet, exhanst gas outlet connect primary plenum or secondary plenum.
As an optimal technical scheme of the utility model, the heat transfer district in vertically set up the flue gas baffling board, the flue gas baffling board be located the heat transfer district top, the flue gas baffling board divide the heat transfer into return stroke passageway and exhaust fume channel, the flue gas is discharged by the exhanst gas outlet after return stroke passageway and exhaust fume channel in proper order.
The top of the return passage is provided with a flue gas circulation port, and the flue gas circulation port is connected with the primary air chamber or the secondary air chamber through a flue gas circulation pipeline.
The utility model discloses in, introduce one wind chamber with 120-. In addition, the tail low-oxygen flue gas can be introduced into a secondary air chamber, so that the combustion intensity of a high-temperature combustion area is reduced, and the combustion time of the briquette on an air distribution plate is prolonged.
As an optimized technical proposal of the utility model, the normal pressure hot water stove also comprises a coal bunker and a coal feeding device.
The coal bunker is internally stored with molded coal, the coal feeding device is connected with a coal outlet of the coal bunker and a coal inlet of the hearth, and the coal feeding device is used for pushing the molded coal stored in the coal bunker into the hearth.
The utility model provides a use method of normal pressure hot water stove includes:
the briquette falls into an air distribution plate after entering a hearth, the air chambers supply air to a main combustion area for supporting combustion, the air inlet ratio of the corresponding air chambers is controlled by adjusting the opening degrees of air baffles at air inlets of different air chambers, so that the share distribution and the thermal environment of different partitions in the main combustion area are adjusted, and the briquette is burnt out to form smoke through the combustion atmosphere of different partitions in the main combustion area in sequence and is discharged by heat exchange of a heat exchange area.
Specifically, when two mutually independent air chambers are arranged below the air distribution plate, the molded coal falls into the air distribution plate after entering the hearth, the air is supplied for combustion support to the main combustion area through the primary air chamber and the secondary air chamber, the molded coal is discharged by heat exchange of the heat exchange area after sequentially passing through the pyrolysis gasification area, the low-temperature combustion area, the high-temperature combustion area and the oxygen-enriched burnout area, and in the combustion process, the opening degrees of the primary air baffle and the secondary air baffle are adjusted to control the air intake ratio of the primary air and the secondary air, so that the share distribution and the thermal environment in the low-temperature combustion area and the high-temperature combustion area are adjusted. The low-oxygen smoke discharged by the normal-pressure hot water stove or the smoke in the return channel is introduced into the primary air chamber.
In addition, when three mutually independent air chambers are arranged below the air distribution plate, the molded coal falls into the air distribution plate after entering the hearth, and supplies air to the main combustion area for combustion supporting through the primary air chamber, the secondary air chamber and the tertiary air chamber, the molded coal is discharged by heat exchange of the heat exchange area after sequentially passing through the pyrolysis gasification area, the low-temperature combustion area, the high-temperature combustion area and the oxygen-enriched burnout area, during the combustion process, the opening degrees of the primary air baffle, the secondary air baffle and the tertiary air baffle are adjusted to control the air intake ratio of the primary air, the secondary air and the tertiary air, further the distribution of the furnace in the low-temperature combustion area, the high-temperature combustion area and the oxygen-enriched burnout area and the thermal environment are adjusted, and the low-oxygen flue gas.
The numerical range of the present invention includes not only the point values listed above, but also any point values between the above numerical ranges not listed, which is limited to space and for the sake of brevity, the present invention does not exhaust the specific point values included in the range.
The system refers to an equipment system, or a production equipment.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses an improve the cloth wind method, further optimize the staged combustion, reach the purpose that reduces NOx, improves the moulded coal solid sulphur rate and reduce the carbon black emission through the control of burning atmosphere.
(2) The utility model discloses in, introduce a plenum with 120 ~ 200 ℃'s afterbody hypoxemia flue gas, or introduce a plenum with return passage top 600 ~ 650 ℃ flue gas, can strengthen the reducing atmosphere in low temperature combustion area to a great extent, provide the thermal environment who utilizes lean oxygen burning more, control the share distribution, thermal environment and the combustion atmosphere in low temperature combustion area and high temperature combustion area, reach and reduce NOxThe purpose is. In addition, the tail low-oxygen flue gas can be introduced into a secondary air chamber, so that the combustion intensity of a high-temperature combustion area is reduced, and the combustion time of the briquette on an air distribution plate is prolonged.
Drawings
Fig. 1 is a schematic structural view of a step-combustion atmospheric hot water boiler according to embodiment 1;
fig. 2 is a schematic structural view of a step-combustion atmospheric hot water boiler according to embodiment 2;
fig. 3 is a schematic structural view of the atmospheric hot water furnace for staged combustion provided in embodiment 3;
wherein, 1-coal bunker; 2-a coal pushing device; 3-primary air baffle; 4-secondary air baffle; 5-a primary air chamber; 6-a secondary air chamber; 7-primary air distribution plate; 8-secondary air distribution plate; 9-an over-fire air duct; 10-a pyrolysis gasification zone; 11-a low temperature combustion zone; 12-a high temperature combustion zone; 13-oxygen-enriched burnout zone; 14-flue gas heat exchange zone; 15-flue gas outlet; 16-tertiary air baffle; 17-a tertiary air chamber; 18-tertiary air distribution plate; 19-refractory layer.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
In a specific embodiment, the utility model provides a normal pressure hot water stove of hierarchical burning, normal pressure hot water stove as shown in fig. 1, fig. 2 and fig. 3, including furnace, furnace divide into the main combustion area and the heat transfer district 14 of intercommunication, fire coal gets into and burns at main combustion area behind the furnace, and the flue gas that the burning produced carries out heat exchange in heat transfer district 14. The main combustion area is divided into a pyrolysis gasification area 10, a low-temperature combustion area 11, a high-temperature combustion area 12 and an oxygen-enriched burnout area 13 along the conveying direction of the molded coal.
The bottom of the main combustion area is provided with an air distribution plate, at least two air chambers which are mutually independent are arranged close to the lower part of the air distribution plate, air is supplied to the main combustion area through the air chambers to assist the combustion of the coal, independent air baffles are arranged at air inlets of the air chambers, and the air inlet ratio of the corresponding air chambers is controlled by adjusting the opening of the air baffles, so that the combustion atmosphere of different zones in the main combustion area is adjusted.
Optionally, as shown in fig. 1, two air chambers independent from each other are disposed under the air distribution plate, and the two air chambers are respectively marked as a primary air chamber 5 and a secondary air chamber 6 along the conveying direction of the molded coal, and convey primary air into the corresponding main combustion area through the primary air chamber 5 and convey secondary air into the corresponding main combustion area through the secondary air chamber 6.
An air inlet of the primary air chamber 5 is provided with a primary air baffle 3 which can be opened and closed, an air inlet of the secondary air chamber 6 is provided with a secondary air baffle 4 which can be opened and closed, and the air inlet ratio of the primary air and the secondary air is controlled by adjusting the opening degrees of the primary air baffle 3 and the secondary air baffle 4.
The part air distribution plate corresponding to the upper part of the primary air chamber 5 is a primary air distribution plate 7, one part of the primary air distribution plate 7 is positioned in the pyrolysis gasification area 10, the other part of the primary air distribution plate is positioned in the low-temperature combustion area 11, air holes are not arranged on the part primary air distribution plate 7 positioned in the pyrolysis gasification area 10, and air holes are arranged on the part primary air distribution plate 7 positioned in the low-temperature combustion area 11. The corresponding part of the secondary air distribution plate above the secondary air chamber 6 is a secondary air distribution plate 8, air holes are formed in the secondary air distribution plate 8, one part of the secondary air distribution plate is located in a high-temperature combustion area 12, the other part of the secondary air distribution plate is located in an oxygen-enriched burnout area 13, and a burnout air pipe 9 is arranged above the part of the secondary air distribution plate 8 located in the oxygen-enriched burnout area 13.
Optionally, three air chambers which are independent from each other are arranged under the air distribution plate, the three air chambers are respectively marked as a primary air chamber 5, a secondary air chamber 6 and a tertiary air chamber 17 along the conveying direction of the molded coal, primary air is conveyed to the corresponding main combustion area through the primary air chamber 5, secondary air is conveyed to the corresponding main combustion area through the secondary air chamber 6, and tertiary air is conveyed to the corresponding main combustion area through the tertiary air chamber 17.
An openable primary air baffle 3 is arranged at an air inlet of the primary air chamber 5, an openable secondary air baffle 4 is arranged at an air inlet of the secondary air chamber 6, an openable tertiary air baffle 16 is arranged at an air inlet of the tertiary air chamber 17, and the intake ratio of the primary air, the secondary air and the tertiary air is controlled by adjusting the opening degrees of the primary air baffle 3, the secondary air baffle 4 and the tertiary air baffle 16.
The part air distribution plate corresponding to the upper part of the primary air chamber 5 is a primary air distribution plate 7, one part of the primary air distribution plate 7 is positioned in the pyrolysis gasification area 10, the other part of the primary air distribution plate is positioned in the low-temperature combustion area 11, air holes are not arranged on the part primary air distribution plate 7 positioned in the pyrolysis gasification area 10, and air holes are arranged on the part primary air distribution plate 7 positioned in the low-temperature combustion area 11. The corresponding part of the air distribution plate above the secondary air chamber 6 is a secondary air distribution plate 8, the main combustion area corresponding to the secondary air distribution plate 8 is a high-temperature combustion area 12, and air holes are formed in the secondary air distribution plate 8. The part of the air distribution plate corresponding to the upper part of the tertiary air chamber 17 is a tertiary air distribution plate 18, the main combustion area corresponding to the tertiary air distribution plate 18 is an oxygen-enriched combustion area 13, air holes are formed in the tertiary air distribution plate 18, and a combustion air pipe 9 is arranged above the tertiary air distribution plate 18.
The main combustion area is communicated with the heat exchange area 14 through a flue gas burnout channel, and the flue gas passes through the flue gas burnout channel after being burnt out in the main combustion area and enters the heat exchange area 14. The flue gas inlet of the flue gas burnout channel is of a necking structure, the flue gas inlet of the flue gas burnout channel is provided with a burnout air duct 9, and the inner wall of the flue gas burnout channel is paved with a fire-resistant layer 19.
The top of the heat exchange area 14 is provided with a flue gas outlet 15, and the flue gas outlet 15 is connected with the primary air chamber 5 or the secondary air chamber 6. A smoke baffle plate is longitudinally arranged in the heat exchange area 14, the smoke baffle plate is positioned at the top of the heat exchange area 14, the heat exchange area 14 is divided into a return channel and a smoke exhaust channel, smoke is exhausted from a smoke outlet 15 after sequentially passing through the return channel and the smoke exhaust channel, a smoke circulating opening is arranged at the top of the return channel, and the smoke circulating opening is connected with the primary air chamber 5 or the secondary air chamber 6.
The normal pressure hot water stove further comprises a coal bunker 1 and a coal feeding device 2, wherein molded coal is stored in the coal bunker 1, and the coal feeding device 2 is connected with a coal outlet of the coal bunker 1 and a coal inlet of the hearth and used for pushing the molded coal stored in the coal bunker 1 into the hearth.
In another embodiment, the present invention provides a staged combustion atmospheric hot water boiler and a method for using the same, wherein the method comprises:
after entering the hearth, the molded coal falls into the air distribution plate, the air chambers supply air to the main combustion area for combustion supporting, the air inlet ratio of the corresponding air chambers is controlled by adjusting the opening degrees of the air baffles at the air inlets of different air chambers, so that the share distribution and the thermal environment of different zones in the main combustion area are adjusted, the molded coal is burned out to form flue gas through the combustion atmosphere of different zones in the main combustion area in sequence, and the flue gas is subjected to heat exchange and is discharged from the heat exchange area 14.
Example 1
The embodiment provides a normal pressure hot water stove of stage combustion, normal pressure hot water stove as shown in fig. 1, including furnace, furnace divide into main combustion area and the heat transfer district 14 of intercommunication, and the burning coal gets into furnace and burns in main combustion area, and the flue gas that the burning produced carries out heat exchange in heat transfer district 14. The main combustion area is divided into a pyrolysis gasification area 10, a low-temperature combustion area 11, a high-temperature combustion area 12 and an oxygen-enriched burnout area 13 along the conveying direction of the molded coal.
The bottom of the main combustion area is provided with an air distribution plate, two air chambers which are mutually independent are arranged under the air distribution plate in a clinging manner, the two air chambers are respectively marked as a primary air chamber 5 and a secondary air chamber 6 along the conveying direction of the molded coal, primary air is conveyed into the corresponding main combustion area through the primary air chamber 5, and secondary air is conveyed into the corresponding main combustion area through the secondary air chamber 6.
An openable primary air baffle 3 is arranged at an air inlet of the primary air chamber 5, an openable secondary air baffle 4 is arranged at an air inlet of the secondary air chamber 6, and the air inlet ratio of primary air and secondary air is controlled by adjusting the opening degrees of the primary air baffle 3 and the secondary air baffle 4.
The corresponding part of the air distribution plate above the primary air chamber 5 is a primary air distribution plate 7, one part of the primary air distribution plate 7 is positioned in the pyrolysis gasification area 10, the other part of the primary air distribution plate is positioned in the low-temperature combustion area 11, air holes are not arranged on the part of the primary air distribution plate 7 positioned in the pyrolysis gasification area 10, and air holes are arranged on the part of the primary air distribution plate 7 positioned in the low-temperature combustion area 11. The corresponding part of the secondary air distribution plate above the secondary air chamber 6 is a secondary air distribution plate 8, the secondary air distribution plate 8 is provided with air holes, one part of the secondary air distribution plate is positioned in a high-temperature combustion area 12, the other part of the secondary air distribution plate is positioned in an oxygen-enriched burnout area 13, and a burnout air pipe 9 is arranged above the part of the secondary air distribution plate 8 positioned in the oxygen-enriched burnout area 13.
The top of the heat exchange area 14 is provided with a flue gas outlet 15, a flue gas baffle plate is longitudinally arranged in the heat exchange area 14 and is positioned at the top of the heat exchange area 14, the flue gas baffle plate divides the heat exchange area 14 into a return passage and a smoke exhaust passage, and flue gas passes through the return passage and the smoke exhaust passage in sequence and then is discharged from the flue gas outlet 15.
The normal pressure hot water stove further comprises a coal bunker 1 and a coal feeding device 2, wherein molded coal is stored in the coal bunker 1, and the coal feeding device 2 is connected with a coal outlet of the coal bunker 1 and a coal inlet of the hearth and used for pushing the molded coal stored in the coal bunker 1 into the hearth.
Example 2
The embodiment provides a normal pressure hot water stove of stage combustion, normal pressure hot water stove as shown in fig. 2, including furnace, furnace divide into main combustion area and the heat transfer district 14 of intercommunication, fire coal gets into furnace and burns in main combustion area, and the flue gas that the burning produced carries out heat exchange in heat transfer district 14. The main combustion area is divided into a pyrolysis gasification area 10, a low-temperature combustion area 11, a high-temperature combustion area 12 and an oxygen-enriched burnout area 13 along the conveying direction of the molded coal.
The bottom of the main combustion area is provided with an air distribution plate, three air chambers which are mutually independent are arranged close to the lower part of the air distribution plate, the three air chambers are respectively marked as a primary air chamber 5, a secondary air chamber 6 and a tertiary air chamber 17 along the conveying direction of the molded coal, primary air is conveyed to the corresponding main combustion area through the primary air chamber 5, secondary air is conveyed to the corresponding main combustion area through the secondary air chamber 6, and tertiary air is conveyed to the corresponding main combustion area through the tertiary air chamber 17.
An openable primary air baffle 3 is arranged at an air inlet of the primary air chamber 5, an openable secondary air baffle 4 is arranged at an air inlet of the secondary air chamber 6, an openable tertiary air baffle 16 is arranged at an air inlet of the tertiary air chamber 17, and the intake ratio of the primary air, the secondary air and the tertiary air is controlled by adjusting the opening degrees of the primary air baffle 3, the secondary air baffle 4 and the tertiary air baffle 16.
The part air distribution plate corresponding to the upper part of the primary air chamber 5 is a primary air distribution plate 7, one part of the primary air distribution plate 7 is positioned in the pyrolysis gasification area 10, the other part of the primary air distribution plate is positioned in the low-temperature combustion area 11, air holes are not arranged on the part primary air distribution plate 7 positioned in the pyrolysis gasification area 10, and air holes are arranged on the part primary air distribution plate 7 positioned in the low-temperature combustion area 11. The corresponding part of the air distribution plate above the secondary air chamber 6 is a secondary air distribution plate 8, the main combustion area corresponding to the secondary air distribution plate 8 is a high-temperature combustion area 12, and air holes are formed in the secondary air distribution plate 8. The part of the air distribution plate corresponding to the upper part of the tertiary air chamber 17 is a tertiary air distribution plate 18, the main combustion area corresponding to the tertiary air distribution plate 18 is an oxygen-enriched combustion area 13, air holes are formed in the tertiary air distribution plate 18, and a combustion air pipe 9 is arranged above the tertiary air distribution plate 18.
The top of the heat exchange area 14 is provided with a flue gas outlet 15, a flue gas baffle plate is longitudinally arranged in the heat exchange area 14 and is positioned at the top of the heat exchange area 14, the flue gas baffle plate divides the heat exchange area 14 into a return passage and a smoke exhaust passage, and flue gas passes through the return passage and the smoke exhaust passage in sequence and then is discharged from the flue gas outlet 15.
The normal pressure hot water stove further comprises a coal bunker 1 and a coal feeding device 2, wherein molded coal is stored in the coal bunker 1, and the coal feeding device 2 is connected with a coal outlet of the coal bunker 1 and a coal inlet of the hearth and used for pushing the molded coal stored in the coal bunker 1 into the hearth.
Example 3
The embodiment provides a normal pressure hot water stove of stage combustion, normal pressure hot water stove as shown in fig. 3, including furnace, furnace divide into main combustion area and the heat transfer district 14 of intercommunication, fire coal gets into furnace and burns in main combustion area, and the flue gas that the burning produced carries out heat exchange in heat transfer district 14. The main combustion area is divided into a pyrolysis gasification area 10, a low-temperature combustion area 11 and a high-temperature combustion area 12 along the conveying direction of the molded coal.
The bottom of the main combustion area is provided with an air distribution plate, two air chambers which are mutually independent are arranged under the air distribution plate in a clinging manner, the two air chambers are respectively marked as a primary air chamber 5 and a secondary air chamber 6 along the conveying direction of the molded coal, primary air is conveyed into the corresponding main combustion area through the primary air chamber 5, and secondary air is conveyed into the corresponding main combustion area through the secondary air chamber 6.
An openable primary air baffle 3 is arranged at an air inlet of the primary air chamber 5, an openable secondary air baffle 4 is arranged at an air inlet of the secondary air chamber 6, and the air inlet ratio of primary air and secondary air is controlled by adjusting the opening degrees of the primary air baffle 3 and the secondary air baffle 4.
The corresponding part of the air distribution plate above the primary air chamber 5 is a primary air distribution plate 7, one part of the primary air distribution plate 7 is positioned in the pyrolysis gasification area 10, the other part of the primary air distribution plate is positioned in the low-temperature combustion area 11, air holes are not arranged on the part of the primary air distribution plate 7 positioned in the pyrolysis gasification area 10, and air holes are arranged on the part of the primary air distribution plate 7 positioned in the low-temperature combustion area 11. The corresponding part of the air distribution plate above the secondary air chamber 6 is a secondary air distribution plate 8, the secondary air distribution plate 8 is provided with air holes, and the secondary air distribution plate is positioned in the high-temperature combustion area 12.
The main combustion area is communicated with the heat exchange area 14 through a flue gas burnout channel, flue gas passes through the flue gas burnout channel from the main combustion area, and enters the heat exchange area 14 for heat exchange after the flue gas burnout channel is burnt out. The flue gas inlet of the flue gas burnout channel is of a necking structure, a burnout air duct 9 is arranged at the flue gas inlet, and a fire-resistant layer 19 is laid on the inner wall of the flue gas burnout channel.
The normal pressure hot water stove further comprises a coal bunker 1 and a coal feeding device 2, wherein molded coal is stored in the coal bunker 1, and the coal feeding device 2 is connected with a coal outlet of the coal bunker 1 and a coal inlet of the hearth and used for pushing the molded coal stored in the coal bunker 1 into the hearth.
The applicant states that the above description is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and those skilled in the art should understand that any changes or substitutions easily conceivable by those skilled in the art within the technical scope of the present invention are within the protection scope and the disclosure scope of the present invention.
Claims (10)
1. The normal-pressure hot water stove capable of burning in a grading manner is characterized by comprising a hearth, wherein the hearth is divided into a main burning area and a heat exchange area which are communicated, fire coal enters the hearth and then burns in the main burning area, and smoke generated by burning exchanges heat in the heat exchange area;
the air distribution plate is arranged at the bottom of the main combustion area, the at least two air chambers which are mutually independent are arranged under the air distribution plate in a close fit manner, air is supplied to the main combustion area through the air chambers to assist the combustion of coal, the independent air baffles are arranged at the air inlets of the air chambers, and the air inlet ratio of the corresponding air chambers is controlled by adjusting the opening of the air baffles, so that the share distribution and the thermal environment of different partitions in the main combustion area are adjusted.
2. The atmospheric hot water furnace as defined in claim 1, wherein the main combustion zone is divided into a pyrolysis gasification zone, a low temperature combustion zone, a high temperature combustion zone and an oxygen-rich burnout zone along a briquette coal conveying direction.
3. The atmospheric hot water stove of claim 2, wherein two air chambers independent from each other are disposed under the air distribution plate, and the air chambers supply air to the main combustion area to assist coal combustion;
the two air chambers are respectively marked as a primary air chamber and a secondary air chamber along the conveying direction of the molded coal, primary air is conveyed into the corresponding main combustion area through the primary air chamber, and secondary air is conveyed into the corresponding main combustion area through the secondary air chamber;
the corresponding part of the air distribution plate above the primary air chamber is a primary air distribution plate, one part of the primary air distribution plate is positioned in the pyrolysis gasification area, the other part of the primary air distribution plate is positioned in the low-temperature combustion area, air holes are not arranged on the part of the primary air distribution plate positioned in the pyrolysis gasification area, and air holes are arranged on the part of the primary air distribution plate positioned in the low-temperature combustion area;
the corresponding part of the air distribution plate above the secondary air chamber is a secondary air distribution plate, the secondary air distribution plate is provided with air holes, one part of the secondary air distribution plate is positioned in a high-temperature combustion area, the other part of the secondary air distribution plate is positioned in an oxygen-enriched burnout area, and a burnout air pipe is arranged above the part of the secondary air distribution plate positioned in the oxygen-enriched burnout area.
4. The atmospheric hot water stove as claimed in claim 3, wherein the primary air chamber has an air inlet with a primary air baffle plate that can be opened and closed, and the secondary air chamber has an air inlet with a secondary air baffle plate that can be opened and closed, and the ratio of the air intake of the primary air to the air intake of the secondary air is controlled by adjusting the opening of the primary air baffle plate and the opening of the secondary air baffle plate.
5. The atmospheric hot water stove of claim 2, wherein three independent air chambers are arranged closely under the air distribution plate, and the air chambers supply air to the main combustion area to assist coal combustion;
the three air chambers are respectively marked as a primary air chamber, a secondary air chamber and a tertiary air chamber along the conveying direction of the molded coal, primary air is conveyed to the corresponding main combustion area through the primary air chamber, secondary air is conveyed to the corresponding main combustion area through the secondary air chamber, and tertiary air is conveyed to the corresponding main combustion area through the tertiary air chamber;
the corresponding part of the air distribution plate above the primary air chamber is a primary air distribution plate, one part of the primary air distribution plate is positioned in the pyrolysis gasification area, the other part of the primary air distribution plate is positioned in the low-temperature combustion area, air holes are not arranged on the part of the primary air distribution plate positioned in the pyrolysis gasification area, and air holes are arranged on the part of the primary air distribution plate positioned in the low-temperature combustion area;
the corresponding part of the air distribution plate above the secondary air chamber is a secondary air distribution plate, the corresponding main combustion area of the secondary air distribution plate is a high-temperature combustion area, and the secondary air distribution plate is provided with air holes;
the air distribution plate corresponding to the upper part of the tertiary air chamber is a tertiary air distribution plate, the main combustion area corresponding to the tertiary air distribution plate is an oxygen-enriched combustion area, air holes are formed in the tertiary air distribution plate, and a combustion air pipe is arranged above the tertiary air distribution plate.
6. The atmospheric hot water stove as claimed in claim 5, wherein the primary air chamber has an air inlet with a primary air baffle plate, the secondary air chamber has an air inlet with a secondary air baffle plate, the tertiary air chamber has a tertiary air baffle plate, and the ratio of the amounts of the primary air, the secondary air and the tertiary air is controlled by adjusting the openings of the primary air baffle plate, the secondary air baffle plate and the tertiary air baffle plate.
7. The atmospheric hot water stove of claim 1, wherein the main combustion zone is communicated with the heat exchange zone through a flue gas burnout channel, and the flue gas passes through the flue gas burnout channel after being burnout in the main combustion zone and enters the heat exchange zone;
the smoke inlet of the smoke burnout channel is of a necking structure;
an over-fire air duct is arranged at the flue gas inlet of the flue gas over-fire channel;
and a refractory layer is paved on the inner wall of the flue gas burnout channel.
8. The atmospheric hot water stove as defined in any one of claims 3 to 6, wherein a flue gas outlet is provided at a top of the heat exchange zone, and the flue gas outlet is connected to the primary air chamber or the secondary air chamber.
9. The atmospheric hot water stove as defined in any one of claims 3 to 6, wherein a flue gas baffle plate is longitudinally arranged in the heat exchange zone, the flue gas baffle plate is positioned at the top of the heat exchange zone, the flue gas baffle plate divides the heat exchange zone into a return channel and a smoke exhaust channel, and the flue gas passes through the return channel and the smoke exhaust channel in sequence and then is discharged from the flue gas outlet;
the top of the return passage is provided with a flue gas circulation port, and the flue gas circulation port is connected with the primary air chamber or the secondary air chamber through a flue gas circulation pipeline.
10. The atmospheric hot water stove according to claim 1, further comprising a coal bunker and a coal feeder;
the coal bunker is internally stored with molded coal, the coal feeding device is connected with a coal outlet of the coal bunker and a coal inlet of the hearth, and the coal feeding device is used for pushing the molded coal stored in the coal bunker into the hearth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921855272.4U CN210891768U (en) | 2019-10-31 | 2019-10-31 | Atmospheric hot water stove with staged combustion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921855272.4U CN210891768U (en) | 2019-10-31 | 2019-10-31 | Atmospheric hot water stove with staged combustion |
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| CN210891768U true CN210891768U (en) | 2020-06-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110686276A (en) * | 2019-10-31 | 2020-01-14 | 兖矿集团有限公司 | Graded combustion normal-pressure hot water stove and using method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110686276A (en) * | 2019-10-31 | 2020-01-14 | 兖矿集团有限公司 | Graded combustion normal-pressure hot water stove and using method thereof |
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