CN202955715U - Combustion device special for wind power hybrid feeding of chained fire bed furnace - Google Patents
Combustion device special for wind power hybrid feeding of chained fire bed furnace Download PDFInfo
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- CN202955715U CN202955715U CN 201220541675 CN201220541675U CN202955715U CN 202955715 U CN202955715 U CN 202955715U CN 201220541675 CN201220541675 CN 201220541675 CN 201220541675 U CN201220541675 U CN 201220541675U CN 202955715 U CN202955715 U CN 202955715U
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Abstract
The utility model discloses a combustion device special for the wind power hybrid feeding of a chained fire bed furnace. The combustion device comprises a hearth, a chained fire grate below the hearth, a material gate on one side of the hearth, a front wall, a front arch, and a double-cavity hopper, wherein the double-cavity hopper has a double-cavity structure which is transversely partitioned by a nozzle component in the hopper; an angle-adjustable flow distribution plate is arranged on the top of the nozzle component; an air inlet of the nozzle component is formed in the side wall of the double-cavity hopper; a jet flow regulating gate is arranged in front of the air inlet; a group of flow guide arc plates is arranged in the nozzle component and positioned behind the air inlet; a part between the bottom plane of the nozzle component and the upper surface of the chained fire grate is inclined; a slit nozzle is formed at the tail end of the nozzle component; and a jet flow barrier is arranged at the rear end of the slit nozzle. The combustion device is reasonable in structural design, the problem of large fly ash quantity of the conventional front wall material spraying technology is solved, the fuel distribution of the fire grate is improved, combustion efficiency is improved, hearth agglomerating is reduced, and the abrasion of a heating surface is reduced.
Description
Technical field
The utility model relates to the feed arrangement of chain type grate stove, relates in particular to the special-purpose burner of a kind of chain type grate stove wind-force mixed feeding.
Background technology
The living beings such as stalk, cavings are reproducible clean energy resourcies, can be directly as the fuel of combustion apparatus.
The characteristics of biomass fuel are that calorific value is very low, and bulk density is extremely low.With coal, compare, the calorific value of equivalent weight biomass fuel only has 50% left and right of coal, bulk density is less than 20% of coal, reaching same burning exerts oneself, the volume of fuel consumed is more than 10 times of coal, use conventional coal combustion technology when the burning of chain type grate stove inner tissue biomass fuel, must increase thickness of bed layer: the twice of fire grate speed while being fire coal of supposition biological substance for combustion, when the thickness of bed layer of grate is at least fire coal 5 of grate thickness times.Coal seam thickness when the grate stove uses middle matter bituminous coal is in 100 millimeter, and therefore during same grate firing equipment burning-used biologic mass fuel, the thickness of bed layer of standard should be more than 500 millimeters, otherwise can not guarantee the normal output of combustion apparatus.
Adopt the mode that chain-grate speed increases thickness of bed layer simultaneously of accelerating, carry out the grate firing of tissue biological's matter fuel, can cause a series of negative consequence, be mainly manifested in three aspects: the one, chain-grate need to be born larger pulling force, such as fire grate speed be increased to twice the fire grate pulling force to increase 8(=2
3) doubly, the hidden danger of bringing the fire grate functional reliability to descend; The 2nd, when the coal gate place adopts thick bed, the security hidden danger that has hopper spontaneous combustion and fuel gas to leak; The 3rd, thick bed burning, make the interior maximum temperature of bed approach the adiabatic combustion temperature of fuel, for conventional biomass fuel, in the living beings grate layer of 500 millimeters thick, in its bed, maximum temperature is more than 1400 ℃, and most of living beings fusion point of ash is at 800～1000 ℃, therefore thick bed burning will bring the Serious Slagging of living beings grate, threaten normally carrying out of combustion process.
In order to solve the above specific question that uses biomass fuel in chain type grate stove, output many technology targetedly, its common feature is to change the coal gate charging into the wind-force charging, adopts the large feed difficult problem of volume consumption of the means solution biomass fuel of material spray.The mode of wind-force charging has two kinds of citation forms: side wall material spray and front wall material spray, and wherein side wall material spray shortcoming is more, is not discussed herein, and the front wall material spray is current mainstream technology.The front wall material spray develops and two technology schools:
The one, the high-order material spray of front wall, be arranged symmetrically with several wind-force spray material ports on the burner hearth front wall of the certain elevation of distance grate surface, form to pile up bed by bulky grain sedimentation in burner hearth, this mode is actually on the blast table spreader of conventional coal-burning boiler early mature technology.Yet be applied to the lightweight biomass fuel, will cause the significantly rising of converter fly ash share, cause a series of distinctive serious problems: material spray has caused a large amount of flying dusts, the flying dust share is up to more than 60% usually, and the sedimentation share is less than 40%.Cause two negative consequences: first fire grate front end occurs very thin without empty fire grate or the bed of the bed of material, has reduced the time of staying of fuel on grate, and the air feed of fire grate front end can not participate in burning in time; It two is particles settling difficulties, has a large amount of fuel particles to fail to drop to bed and becomes flying dust, and efficiency of combustion descends, and Boiler Furnace slagging worsens, heating surface wear aggravation while using high ash biomass fuel (as rice husk).
The 2nd, front wall low level material spray, between grate surface and front wall lower end, (being the coal gate position of coal-burning boiler) arranges the wind-force spray material port, typical patented technology is a kind of material feeding blower device that utility model 200520074650.7 proposes, location arrangements wind-force spray material port at coal gate sprays into burner hearth by biomass fuel, compared with high-order material spray, the flying dust share can be reduced to 40% left and right, has improved the fire grate grate and has distributed, improve efficiency of combustion, alleviated the Boiler Furnace slagging problem.But the fuel particle in the material spray jet, still there is very high horizontal velocity when entering burner hearth, fuel particle could part after away from front wall sedimentation, the sedimentation share is less than 60%, the fire grate front end still there will be without the empty fire grate of the bed of material or bed thick not enough, and the time of staying of fuel on grate still falls short of; Flying dust still reduces not, and efficiency of combustion is still not high enough, and the Boiler Furnace slagging problem does not thoroughly solve yet, and heating surface wear is still more serious.
The too high slagging scorification problem of bed temperature still exists simultaneously, in order further to control the grate slagging scorification, many coal-burning boiler patented technologies adopt special cooling system, such as the fire grate water-cooling system, to shift a part of grate thermal discharge (as United States Patent (USP) 4389978,4429664,6145451, US6220190B1 etc.), make the bed temperature of grate descend, alleviate the grate slagging scorification.But this method is very poor to the cooling effect of the king-sized living beings bed of thickness, improve fire grate posterior segment slagging scorification effect little.
Use front wall material spray technology on the grate stove during burning-used biologic mass fuel, reduce the flying dust share, the technology barrier faced has two: one, take necessary technical measures, organize perfect particles settling process, impel the biological particles that lip jet is carried to drop to as much as possible bed face, only have the enough beds of the thickness of formation, just can make the flying dust share descend; Its two, for the thick bed formed, take necessary technical measures, control the temperature of bed, to avoid the bed slagging scorification.
The utility model content
The purpose of this utility model is in order to make up the deficiency of prior art, provide a kind of chain type grate stove wind-force mixed feeding special-purpose burner, to solve the high problem of existing front wall material spray technology flying dust share, improved the fire grate fuel distribution simultaneously, improved efficiency of combustion, alleviated Boiler Furnace slagging and reduced heating surface wear.
The utility model is achieved through the following technical solutions:
The special-purpose burner of a kind of chain type grate stove wind-force mixed feeding, include burner hearth, the chain-grate of burner hearth below, the material gate of burner hearth one side, front wall and face arch and two-chamber hopper, it is characterized in that: described two-chamber hopper is the double cavity structure that the nozzle assembly in hopper laterally is separated into it, the top of described nozzle assembly is provided with the adjustable flow distribution plate of angle, the air inlet of described nozzle assembly is located on the sidewall of two-chamber hopper, and be provided with the jet flow adjustment doors before air inlet, be provided with one group of water conservancy diversion arc plate after being positioned at air inlet in described nozzle assembly, spacing between the baseplane of described nozzle assembly and the upper surface of chain-grate is skewed, the tail end of described nozzle assembly is provided with seam shape spout, the rear end of described seam shape spout is provided with the jet block piece.
The upper surface of described nozzle assembly baseplane and chain-grate has one 5
o～10
oThe angle that warps.
The architectural feature of described water conservancy diversion arc plate is that front end is parallel with the side incoming flow, and each distance between plates of front end is equal, and water conservancy diversion arc plate end arc transition turns a quarter bend, and each distance between plates after turning also equates.
Described seam shape width of jet direction is laterally arranged on grate surface, vertical with the chain-grate direction of motion; The height of described seam shape spout is 5～40 millimeters, and its bottom surface is apart from 50～120 millimeters of grate surfaces, and the jet direction that described seam shape spout forms is parallel to grate surface.
Described jet block piece is connected with the bottom surface case with the two sides of nozzle assembly.
Described jet block piece forms by two the heat-resisting steel sheet and plate that angle, radius of the radian be not less than 1/4 circular arc of 100 millimeters and is welded, or by two plane heat-resisting steel sheet and plates that form angle, perhaps only by a plane heat-resisting steel sheet and plate vertical welding, in the baseplane of nozzle assembly, formed, and heat-resisting steel sheet and plate is all wide with nozzle assembly.
The horizontal range of described jet block piece upper limb and face arch bottom is 100～300 millimeters.
Its principle is: designed a kind of new mixing feed pattern, by regulating the inclination angle of flow distribution plate, can change the allocation proportion in biomass fuel chamber before and after hopper.The fuel of the ante-chamber of hopper directly arrives fire grate, and along with the motion of chain-grate lays out a biomass fuel bed on fire grate, as the bottom of grate, the nozzle assembly bottom has determined the thickness of this bottom apart from the height of fire grate.When the fuel of hopper back cavity drops to the seam shape spout of nozzle assembly, under the effect of spout air-flow, form one seam shape Particle laden jet and enter burner hearth.Regulate the intake of nozzle assembly, can control the spray volume of biomass fuel.Above Particle laden jet slows down immediately and turns under the effect of jet block piece, when the horizontal component velocity of biomass fuel pellet reduces greatly, obtained velocity component vertically upward, take-off before block piece, then evenly be scattered in jet block piece back.
The utility model has the advantages that:
First, approximately there is the fuel of 20% left and right to be fallen by ante-chamber, form smooth initial bed, the fire grate front end occurred while having solved front wall low level material spray is without the shortcoming of bed material, so that fresh grate surface receives radiation of burner hearth more and avoid fire grate wind sky to put, both facilitated combustion apparatus to start, the flying dust share that can make again initial bed is zero.
The second, all the other approximately 80% fuel be injected into burner hearth in gas grain two-phase seam shape jet.Due to the horizontal component velocity of the major part of having eliminated particle, the setting condition of particle significantly improves, and can on grate, form a settled layer that thickness is very large, and the flying dust share significantly descends thereupon.
The 3rd, the burning load overwhelming majority is from the grate interior shifting to furnace cavity.As everyone knows, the essential characteristic of biomass fuel is the volatile matter content extra-high-speed, and during the calorific value of most of biomass fuel forms, the contribution more than 2/3rds is from volatile matter.The upthrow take-off process of particle, can significantly extend the front time of staying in furnace flame of particles settling, makes particle fully pyrolysis in infall process, separates out volatile matter.Combustible in grate only has remaining fixed carbon, the fire grate air quantity can significantly be cut down, the Actual combustion load reduction of grate inside more than 50%, temperature is minimized, Serious Slagging, even can not occur in the grate ash deposition propensity slowed down in thick bed yet.Due to the decline of flying dust share, the Boiler Furnace slagging tendency also can be effectively controlled simultaneously.
The accompanying drawing explanation
Fig. 1 is the utility model structural representation.
The A-A that Fig. 2 is nozzle assembly in Fig. 1 is to cutaway view.
Fig. 3 is the situation of using triangle jet block piece.
Fig. 4 is the situation of using baffle plate shape jet block piece.
The specific embodiment
Referring to accompanying drawing, the special-purpose burner of a kind of chain type grate stove wind-force mixed feeding, include burner hearth 12, the chain-grate 8 of burner hearth 12 belows, the material gate 1 of burner hearth 12 1 sides, front wall 9 and face arch 11 and two-chamber hopper 4, the double cavity structure that two-chamber hopper 4 laterally is separated into it for the nozzle assembly 6 in hopper, the top of nozzle assembly 6 is provided with the adjustable flow distribution plate of angle 3, the air inlet 5 of described nozzle assembly 6 is located on the sidewall of two-chamber hopper 4, and be provided with jet flow adjustment doors 13 before air inlet 5, be provided with one group of water conservancy diversion arc plate 14 after being positioned at air inlet 5 in nozzle assembly 6, spacing between the upper surface of the baseplane of nozzle assembly 6 and chain-grate 8 is skewed, the tail end of nozzle assembly 6 is provided with seam shape spout 7, the rear end of seam shape spout 7 is provided with jet block piece 10.
The upper surface of described nozzle assembly 6 baseplanes and chain-grate 8 has one 5
o～10
oThe angle that warps; The architectural feature of described water conservancy diversion arc plate 14 is that front end is parallel with the side incoming flow, and each distance between plates of front end is equal, and water conservancy diversion arc plate 14 end arc transition turn a quarter bend, and each distance between plates after turning also equates; Described seam shape spout 7 widths are laterally arranged on grate surface, vertical with chain-grate 8 directions of motion; The height of described seam shape spout 7 is 5～40 millimeters, and its bottom surface is apart from 50～120 millimeters of grate surfaces, and the jet direction that seam shape spout 7 forms is parallel to grate surface; Described jet block piece 10 is connected with the bottom surface case with the two sides of nozzle assembly 6; Described jet block piece 10 forms by two the heat-resisting steel sheet and plate that angle, radius of the radian be not less than 1/4 circular arc of 100 millimeters and is welded, or by two plane heat-resisting steel sheet and plates that form angle, perhaps only by a plane heat-resisting steel sheet and plate vertical welding, in the baseplane of nozzle assembly 6, formed, and heat-resisting steel sheet and plate is all wide with nozzle assembly 6; The horizontal range of described jet block piece 10 upper limbs and face arch 11 bottoms is 100～300 millimeters.
Due to same circular arc jet block piece 10 or triangle jet block piece 14 or baffle plate shape jet block piece 15 shocks, in the interior pyrolysis of burner hearth 12, separate out volatile matter after fuel particle is tossed, fully burning.Constantly free settling forms large thickness grate layer simultaneously, with chain-grate 8, shifts to the burner hearth tail end.
Claims (7)
1. the special-purpose burner of a chain type grate stove wind-force mixed feeding, include burner hearth, the chain-grate of burner hearth below, the material gate of burner hearth one side, front wall and face arch and two-chamber hopper, it is characterized in that: described two-chamber hopper is the double cavity structure that the nozzle assembly in hopper laterally is separated into it, the top of described nozzle assembly is provided with the adjustable flow distribution plate of angle, the air inlet of described nozzle assembly is located on the sidewall of two-chamber hopper, and be provided with the jet flow adjustment doors before air inlet, be provided with one group of water conservancy diversion arc plate after being positioned at air inlet in described nozzle assembly, spacing between the baseplane of described nozzle assembly and the upper surface of chain-grate is skewed, the tail end of described nozzle assembly is provided with seam shape spout, the rear end of described seam shape spout is provided with the jet block piece.
2. the special-purpose burner of chain type grate stove wind-force mixed feeding according to claim 1, it is characterized in that: the upper surface of described nozzle assembly baseplane and chain-grate has one 5
o～10
oThe angle that warps.
3. the special-purpose burner of chain type grate stove wind-force mixed feeding according to claim 1, it is characterized in that: the architectural feature of described water conservancy diversion arc plate is that front end is parallel with the side incoming flow, and each distance between plates of front end equates, water conservancy diversion arc plate end arc transition turns a quarter bend, and each distance between plates after turning also equates.
4. the special-purpose burner of chain type grate stove wind-force mixed feeding according to claim 1, it is characterized in that: described seam shape width of jet direction is laterally arranged on grate surface, vertical with the chain-grate direction of motion; The height of described seam shape spout is 5～40 millimeters, and its bottom surface is apart from 50～120 millimeters of grate surfaces, and the jet direction that described seam shape spout forms is parallel to grate surface.
5. the special-purpose burner of chain type grate stove wind-force mixed feeding according to claim 1, it is characterized in that: described jet block piece is connected with the bottom surface case with the two sides of nozzle assembly.
6. the special-purpose burner of chain type grate stove wind-force mixed feeding according to claim 5, it is characterized in that: described jet block piece forms by two the heat-resisting steel sheet and plate that angle, radius of the radian be not less than 1/4 circular arc of 100 millimeters and is welded, or by two plane heat-resisting steel sheet and plates that form angle, perhaps only by a plane heat-resisting steel sheet and plate vertical welding, in the baseplane of nozzle assembly, formed, and heat-resisting steel sheet and plate is all wide with nozzle assembly.
7. the special-purpose burner of chain type grate stove wind-force mixed feeding according to claim 6, it is characterized in that: the horizontal range of described jet block piece upper limb bottom face arch is 100～300 millimeters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220541675 CN202955715U (en) | 2012-10-22 | 2012-10-22 | Combustion device special for wind power hybrid feeding of chained fire bed furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220541675 CN202955715U (en) | 2012-10-22 | 2012-10-22 | Combustion device special for wind power hybrid feeding of chained fire bed furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202955715U true CN202955715U (en) | 2013-05-29 |
Family
ID=48461285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220541675 Expired - Fee Related CN202955715U (en) | 2012-10-22 | 2012-10-22 | Combustion device special for wind power hybrid feeding of chained fire bed furnace |
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|---|---|
| CN (1) | CN202955715U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108278593A (en) * | 2017-01-06 | 2018-07-13 | 贵州中烟工业有限责任公司 | A kind of operation method of boiler |
-
2012
- 2012-10-22 CN CN 201220541675 patent/CN202955715U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108278593A (en) * | 2017-01-06 | 2018-07-13 | 贵州中烟工业有限责任公司 | A kind of operation method of boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20151022 |
|
| EXPY | Termination of patent right or utility model |