CN104713229A - Pulverized coal burning air heating furnace - Google Patents
Pulverized coal burning air heating furnace Download PDFInfo
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- CN104713229A CN104713229A CN201510135509.1A CN201510135509A CN104713229A CN 104713229 A CN104713229 A CN 104713229A CN 201510135509 A CN201510135509 A CN 201510135509A CN 104713229 A CN104713229 A CN 104713229A
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Abstract
The invention relates to a pulverized coal burning air heating furnace. The pulverized coal burning air heating furnace comprises a furnace body, a chimney installed on the top end of the furnace body, a heat exchange cavity, a furnace chamber and a bottom silo, wherein the heat exchange cavity, the furnace chamber and the bottom silo are arranged in the furnace body in sequence from top to bottom, and a flue gas passageway with an airflow direction from bottom to top and an air passageway with an airflow direction from top to bottom are formed in the heat exchange cavity; an upper portion opening of the flue gas passageway is communicated with the chimney, a lower portion opening of the flue gas passageway is communicated with the furnace chamber, an air blower is installed on an upper portion opening of the air passageway, a hot air outlet communicated with a lower portion opening of the air passageway is formed in the lower portion of the furnace body, the bottom of the furnace body is connected with a pulverized coal burner, a nozzle of the front end of the pulverized coal burner is communicated with an inlet of the furnace chamber, the rear portion of the pulverized coal burner is connected with a feeding hopper, and the middle portion of the pulverized coal burner is connected with two sets of air supply mechanisms, wherein one set of the air supply mechanisms is connected with an air blower, and the other set of the air supply mechanisms is communicated with the bottom of the air passageway through a return duct. The pulverized coal burning air heating furnace has the advantages of being simple in structure, convenient to control, high in burning efficiency and good in heat transfer effect.
Description
Technical field
The present invention relates to hot-blast stove field, specifically a kind of coal dust firing hot-blast stove.
Background technology
Hot-blast stove generally comprises body of heater, burner hearth, flue, chimney, heat exchanging chamber and blower fan etc., and burner hearth is located at lower portion of furnace body, and flue is communicated with burner hearth and chimney, introduces cold wind and export hot blast in heat exchanging chamber after flue heat exchange.Common hot-blast stove is fuel mainly with coal, and lump coal or particulate coal render to burner hearth combustion through coal feed point, and send into air-breathing at burner hearth bottom or sidepiece, the flue gas carrying heat carries out heat exchange with air in heat exchanging chamber.
In use there is following defect in common hot-blast stove: 1) lime-ash that produces in burner hearth combustion of lump coal or particulate coal is more and easily occur the insufficient phenomenon of burning, causes energy waste and environmental pollution; 2) heat exchange structure in heat exchanging chamber and the air-supply structure in burner hearth are reasonable not, cause heat transfer effect bad.The efficiency of combustion problem of coal and the heat exchange efficiency problem of hot-blast stove are all hot-blast stove field technical problem urgently to be resolved hurrily for a long time.
Summary of the invention
The technical problem to be solved in the present invention is to provide that a kind of structure is simple, manipulation is convenient, efficiency of combustion is high and the coal dust firing hot-blast stove of good effect of heat exchange.
For solving the problems of the technologies described above, coal dust firing hot-blast stove of the present invention comprises body of heater, is arranged on the chimney on body of heater top and is successively set on heat exchanging chamber, burner hearth and the Lower Hold in body of heater from top to bottom, is provided with airflow direction exhaust gases passes from the bottom to top and airflow direction air duct from top to bottom in heat exchanging chamber, the upper opening of exhaust gases passes is communicated with chimney, the lower openings of exhaust gases passes is communicated with burner hearth, the upper opening of air duct is provided with air blast, the bottom of body of heater offers the hot-blast outlet be communicated with the lower openings of air duct, its design feature is that the bottom of described body of heater is connected with coal burner, the nozzle of coal burner front end is communicated with burner hearth entrance, the rear portion of coal burner is connected with feed hopper, the middle part of coal burner connects two cover wind pushing mechanisms, wherein a set of wind pushing mechanism is connected with pressure fan, another set of wind pushing mechanism is communicated with the bottom of air duct by backwind tube.
Adopt said structure, using coal dust as fuel, effectively can improve coal-fired efficiency of combustion; A set of wind pushing mechanism utilizes backwind tube to introduce the high-temperature hot air after heating, another set of wind pushing mechanism utilizes pressure fan to introduce cold air, air mixing enters in coal burner combustion-supporting jointly, high-temperature hot air serves the effect of preheating, improves the efficiency of combustion of coal dust in coal burner.
The main body of described coal burner is the cylindrical shell that surrounded by inside and outside two layers of walls and the inner chamber of cylindrical shell is combustion chamber, drum outer wall and cylinder inwall interval are arranged and gap between two layers of walls forms annular wind chamber through sealing, described wind pushing mechanism is communicated with annular wind chamber, and on cylinder inwall, spacer ring is provided with multiple connection annular wind chamber and combustion chamber and can blows out the tangential blowhole of whirlwind in combustion chamber; The front opening of cylindrical shell is the nozzle of coal burner, and cylinder back-end offers coal dust import, and coal dust import is communicated with feed hopper.Wind pushing mechanism is utilized to send into air in annular wind chamber, by tangential blowhole to blow air air-flow in combustion chamber, because tangential blowhole is established multiple at cylinder inwall ring, namely multiply air-flow forms whirlwind after superposing in combustion chamber, carry coal dust in whirlwind secretly to rotate in combustion chamber, fully contact with air while coal dust rotates and burn, having increased substantially the efficiency of combustion of coal dust.In addition, as a kind of distribution form of tangential blowhole, described tangential blowhole interval on the length direction of cylindrical shell multilayer is set and every one deck all has interval is periphery multiple.This kind of structure air draught can be made to be admitted to more evenly and more have levels, make each position in combustion chamber on length direction that whirlwind all can be had to produce, more contribute to coal dust Thorough combustion.
Described wind pushing mechanism comprises the air main that extends along coal burner length direction and to be communicated with air main and along the spaced many secondary airducts of air main length direction, the other end of secondary airduct is connected with coal burner, and secondary airduct is provided with valve.Utilize the air volume adjustment in many secondary airduct adjustable annular wind chambeies, thus the air volume adjustment in adjustment coal burner, thus improve coal-fired efficiency of combustion further.
The top of described heat exchanging chamber is interval with multiple centre from top to bottom and offered the annular housing of cigarette through hole and the outer wall of annular housing and inboard wall of furnace body seal and fit, be provided with the hollow terminal pad that external diameter is less than body of heater internal diameter between two adjacent annular housings, the top of hollow terminal pad is connected with the upper ventilation duct is communicated with the annular housing above it on the position near one lateral edges, the bottom of hollow terminal pad is connected with the lower ventilation duct be communicated with the annular housing below it on the position at its another opposite side edge close; Inner chamber, the lower ventilation duct of the inner chamber of each annular housing, upper ventilation duct, hollow terminal pad gang up formation air duct successively, formation exhaust gases passes is ganged up in each gap crossed between cigarette through hole, the outer wall of gap between annular housing and hollow terminal pad and hollow terminal pad and inboard wall of furnace body successively, and backwind tube is communicated with the annular housing being positioned at the bottom.Adopt this structure, the bottom-up flowing of flue gas, except the crossing cigarette through hole and to be directly communicated with chimney of top, other is crossed cigarette through hole and is all stopped by hollow terminal pad, and flue gas needs to walk around whole hollow terminal pad, what then just can enter last layer crosses cigarette through hole, namely whole hollow terminal pad envelopes by flue gas, thus can carry out more efficient heat exchange with the air in hollow terminal pad, simultaneously, This structure increases the stroke of flue gas, further ensure heat transfer effect; Same, air duct also adopts the flow passage structure of winding type of turning back, thus also can absorb the heat of flue gas to greatest extent, improves heat transfer effect.
The present invention has that structure is simple, manipulation is convenient, efficiency of combustion is high and the advantage of good effect of heat exchange.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail:
Fig. 1 is overall structure schematic diagram of the present invention;
Fig. 2 is the longitudinal sectional structure schematic diagram of coal burner in the present invention;
Fig. 3 is the furnace interior sectional structure schematic diagram of A-A line in Fig. 1;
Fig. 4 is the furnace interior sectional structure schematic diagram of B-B line in Fig. 1.
Detailed description of the invention
With reference to accompanying drawing, coal dust firing hot-blast stove of the present invention comprises body of heater 1, is arranged on the chimney 2 on body of heater 1 top and is successively set on heat exchanging chamber 3, burner hearth 4 and the Lower Hold 5 in body of heater 1 from top to bottom, is provided with airflow direction exhaust gases passes from the bottom to top and airflow direction air duct from top to bottom in heat exchanging chamber 3.The upper opening of exhaust gases passes is communicated with chimney 2, the lower openings of exhaust gases passes is communicated with burner hearth 4, the upper opening of air duct is provided with air blast 6, the bottom of body of heater 1 offers the hot-blast outlet 7 be communicated with the lower openings of air duct, the bottom of body of heater 1 is connected with coal burner 8, the nozzle 81 of coal burner 8 front end is communicated with burner hearth entrance, the rear portion of coal burner 8 is connected with feed hopper 9, the middle part of coal burner 8 connects two cover wind pushing mechanisms, wherein a set of wind pushing mechanism is connected with pressure fan 10, another set of wind pushing mechanism is communicated with the bottom of air duct by backwind tube 11.Adopt this structure, using coal dust as fuel, effectively can improve coal-fired efficiency of combustion.A set of wind pushing mechanism utilizes backwind tube 11 to introduce the high-temperature hot air after heating, another set of wind pushing mechanism utilizes pressure fan 10 to introduce cold air, air mixing enters in coal burner combustion-supporting jointly, high-temperature hot air serves the effect of preheating, improves the efficiency of combustion of coal dust in coal burner 8.As shown in the figure, wind pushing mechanism comprises the air main 12 that extends along coal burner 8 length direction and to be communicated with air main 12 and along the spaced many secondary airducts 13 of air main 12 length direction, the other end of secondary airduct 13 is connected with coal burner, and secondary airduct 13 is provided with valve 14.
With reference to accompanying drawing, the main body of coal burner 8 is the cylindrical shell that surrounded by inside and outside two layers of walls and the inner chamber of cylindrical shell is combustion chamber 8, drum outer wall 82 and cylinder inwall 83 interval are arranged and gap between two layers of walls forms annular wind chamber 84 through sealing, wind pushing mechanism is communicated with annular wind chamber 84, and on cylinder inwall 83, spacer ring is provided with multiple connection annular wind chamber 84 and combustion chamber 80 and can blows out the tangential blowhole 85 of whirlwind in combustion chamber 80.The front opening of cylindrical shell is the nozzle 81 of coal burner 8, and cylinder back-end offers coal dust import, and coal dust import is communicated with feed hopper 9.Wind pushing mechanism is utilized to send into air in annular wind chamber 84, by tangential blowhole 85 to blow air air-flow in combustion chamber 80, because tangential blowhole 85 is established multiple at cylinder inwall 83 ring, namely multiply air-flow forms whirlwind after superposing in combustion chamber 80, carry coal dust in whirlwind secretly to rotate in combustion chamber 80, fully contact with air while coal dust rotates and burn, having increased substantially the efficiency of combustion of coal dust.For the setting of tangential blowhole 85, as shown in Figure 2, to set five tangential blowhole in same cylindrical shell cross section pressed on ring, the center line 850 of these five tangential blowhole 85 is all tangent with same virtual circle, this virtual circle is the broken circle 86 in figure, under this kind of structure, broken circle 86 in the flow direction of the air-flow blown out by tangential blowhole 85 and figure is tangent, the multiply air-flow tangent with broken circle superposes in combustion chamber 80, thus in combustion chamber 80, form the whirlwind that the center line around cylindrical shell rotates.In addition, as a kind of distribution form of tangential blowhole 85, tangential blowhole 85 interval on the length direction of cylindrical shell multilayer is set and every one deck all has interval is periphery multiple.This kind of structure air draught can be made to be admitted to more evenly and more have levels, make each position in combustion chamber 80 on length direction that whirlwind all can be had to produce, more contribute to coal dust Thorough combustion.
With reference to accompanying drawing, the top of heat exchanging chamber 3 is interval with multiple centre from top to bottom and offered the annular housing 16 of cigarette through hole 15 and the outer wall of annular housing 16 and inboard wall of furnace body seal and fit, be provided with the hollow terminal pad 17 that external diameter is less than body of heater internal diameter between two adjacent annular housings 16, the top of hollow terminal pad 17 be connected with on the position near one lateral edges is communicated with the annular housing 16 above it upper ventilation duct 18, hollow terminal pad 17 bottom on the position at its another opposite side edge close, be connected with the lower ventilation duct 19 be communicated with the annular housing 16 below it.The inner chamber of each annular housing 16, upper ventilation duct 18, the inner chamber of hollow terminal pad 17, lower ventilation duct 19 gang up formation air duct successively, formation exhaust gases passes is ganged up in each gap crossed between cigarette through hole 15, the outer wall of gap between annular housing 16 and hollow terminal pad 17 and hollow terminal pad 17 and inboard wall of furnace body successively, and backwind tube 11 is communicated with the annular housing 16 being positioned at the bottom.The bottom-up flowing of flue gas, except the crossing cigarette through hole 15 and to be directly communicated with chimney 2 of top, other is crossed cigarette through hole 15 and is all stopped by hollow terminal pad 17, flue gas needs to walk around whole hollow terminal pad 17, and what then just can enter last layer crosses cigarette through hole 15, and namely whole hollow terminal pad 17 envelopes by flue gas, thus more efficient heat exchange can be carried out with the air in hollow terminal pad 17, meanwhile, This structure increases the stroke of flue gas, further ensure heat transfer effect; Same, air duct also adopts the flow passage structure of winding type of turning back, thus also can absorb the heat of flue gas to greatest extent, improves heat transfer effect.
In sum, the invention is not restricted to above-mentioned detailed description of the invention.Those skilled in the art, under the premise without departing from the spirit and scope of the present invention, can do some changes and modification.Protection scope of the present invention should be as the criterion with claim of the present invention.
Claims (5)
1. a coal dust firing hot-blast stove, comprise body of heater (1), be arranged on the chimney (2) on body of heater (1) top and be successively set on heat exchanging chamber (3), burner hearth (4) and the Lower Hold (5) in body of heater (1) from top to bottom, in heat exchanging chamber (3), be provided with airflow direction exhaust gases passes from the bottom to top and airflow direction air duct from top to bottom, the upper opening of exhaust gases passes is communicated with chimney (2), the lower openings of exhaust gases passes is communicated with burner hearth (4), the upper opening of air duct is provided with air blast (6), the bottom of body of heater (1) offers the hot-blast outlet (7) be communicated with the lower openings of air duct, it is characterized in that the bottom of described body of heater (1) is connected with coal burner (8), the nozzle (81) of coal burner (8) front end is communicated with burner hearth entrance, the rear portion of coal burner (8) is connected with feed hopper (9), the middle part of coal burner (8) connects two cover wind pushing mechanisms, wherein a set of wind pushing mechanism is connected with pressure fan (10), another set of wind pushing mechanism is communicated with the bottom of air duct by backwind tube (11).
2. coal dust firing hot-blast stove as claimed in claim 1, it is characterized in that the main body of described coal burner (8) is the cylindrical shell that surrounded by inside and outside two layers of walls and the inner chamber of cylindrical shell is combustion chamber (8), drum outer wall (82) and cylinder inwall (83) interval are arranged and gap between two layers of walls forms annular wind chamber (84) through sealing, described wind pushing mechanism is communicated with annular wind chamber (84), and the upper spacer ring of cylinder inwall (83) is provided with multiple connection annular wind chamber (84) and combustion chamber (80) and can blows out the tangential blowhole (85) of whirlwind in combustion chamber (80); The front opening of cylindrical shell is the nozzle (81) of coal burner (8), and cylinder back-end offers coal dust import, and coal dust import is communicated with feed hopper (9).
3. coal dust firing hot-blast stove as claimed in claim 2, it is characterized in that described tangential blowhole (85) interval on the length direction of cylindrical shell arranges multilayer and every one deck all has interval is periphery multiple.
4. coal dust firing hot-blast stove as claimed in claim 1, it is characterized in that described wind pushing mechanism comprises the air main (12) that extends along coal burner (8) length direction and to be communicated with air main (12) and along the spaced many secondary airducts (13) of air main (12) length direction, the other end of secondary airduct (13) is connected with coal burner, secondary airduct (13) is provided with valve (14).
5. coal dust firing hot-blast stove as claimed in claim 1, it is characterized in that the top of described heat exchanging chamber (3) is interval with multiple centre from top to bottom and offered the annular housing (16) of cigarette through hole (15) and the outer wall of annular housing (16) and inboard wall of furnace body seal and fit, the hollow terminal pad (17) that external diameter is less than body of heater internal diameter is provided with between two adjacent annular housings (16), the top of hollow terminal pad (17) is connected with the upper ventilation duct (18) be communicated with the annular housing (16) above it on the position near one lateral edges, the bottom of hollow terminal pad (17) is connected with the lower ventilation duct (19) be communicated with the annular housing (16) below it on the position near its another opposite side edge, the inner chamber of each annular housing (16), upper ventilation duct (18), the inner chamber of hollow terminal pad (17), lower ventilation duct (19) gang up formation air duct successively, formation exhaust gases passes is ganged up in each gap crossed between cigarette through hole (15), the outer wall of gap between annular housing (16) and hollow terminal pad (17) and hollow terminal pad (17) and inboard wall of furnace body successively, and backwind tube (11) is communicated with the annular housing (16) being positioned at the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510135509.1A CN104713229A (en) | 2015-03-26 | 2015-03-26 | Pulverized coal burning air heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510135509.1A CN104713229A (en) | 2015-03-26 | 2015-03-26 | Pulverized coal burning air heating furnace |
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| Publication Number | Publication Date |
|---|---|
| CN104713229A true CN104713229A (en) | 2015-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510135509.1A Pending CN104713229A (en) | 2015-03-26 | 2015-03-26 | Pulverized coal burning air heating furnace |
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| CN (1) | CN104713229A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351027A (en) * | 2020-03-25 | 2020-06-30 | 济南黄台煤气炉有限公司 | Annular cutting feeding burner of cyclone furnace |
| CN111351029A (en) * | 2020-03-25 | 2020-06-30 | 济南黄台煤气炉有限公司 | Annular tangential feeding burner of cyclone furnace |
| CN112617629A (en) * | 2021-01-07 | 2021-04-09 | 郑颖 | Particle combustion furnace |
-
2015
- 2015-03-26 CN CN201510135509.1A patent/CN104713229A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111351027A (en) * | 2020-03-25 | 2020-06-30 | 济南黄台煤气炉有限公司 | Annular cutting feeding burner of cyclone furnace |
| CN111351029A (en) * | 2020-03-25 | 2020-06-30 | 济南黄台煤气炉有限公司 | Annular tangential feeding burner of cyclone furnace |
| CN112617629A (en) * | 2021-01-07 | 2021-04-09 | 郑颖 | Particle combustion furnace |
| CN112617629B (en) * | 2021-01-07 | 2024-04-26 | 郑颖 | Particle combustion furnace |
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Application publication date: 20150617 |