CN201237236Y - Composite secondary air apparatus for chain boiler combustion - Google Patents
Composite secondary air apparatus for chain boiler combustion Download PDFInfo
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- CN201237236Y CN201237236Y CNU2008200598528U CN200820059852U CN201237236Y CN 201237236 Y CN201237236 Y CN 201237236Y CN U2008200598528 U CNU2008200598528 U CN U2008200598528U CN 200820059852 U CN200820059852 U CN 200820059852U CN 201237236 Y CN201237236 Y CN 201237236Y
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- chain
- air
- grate boiler
- wind
- jet pipe
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Abstract
The utility model relates to a chain grate boiler combustion composite secondary air device which comprises a chain grate boiler and a blower, wherein, two main air pipes are respectively arranged at the throat parts formed by a front furnace arch and a back furnace arch; each main air pipe is provided with a branch air pipe leading to a hearth; air spray pipes are arranged on the furnace arch and the side wall above the throat; and the air spray pipe on the furnace arch is as high as the air spray pipe on the side wall. Compared with the prior art, the utility model comprises the flow characteristic of a fluid and the heat transmission characteristic of the hearth of a chain furnace, to enable the smoke gases inside the hearth to be mixed, reduce the emission of burnable gas and carbon black, reduce unburned carbon in flue dust, reduce the emission of nitrogen oxide, and achieve the effects of energy conservation and environmental protection.
Description
Technical field
The utility model relates to fields such as the energy and thermal power engineering, particularly the chain-grate boiler compound overfire air device that burns.
Background technology
Existing chain-grate boiler is a kind of grate firing mode of using always, it is characterized in that lump coal falls on the fire grate from coal bunker; The air compartment of air under the fire grate upwards flows out, with volatile matter to separate out direction identical, PARALLEL FLOW; The effect of preceding chimney arch is to promote igniting of new coal, and the effect of back chimney arch is the after-flame that promotes coal; The coal seam on traveling-grate stoker from left to right successively through moisture separate out, volatile matter is separated out, the burning of volatile combustion, coke and after-flame plurality of processes.The content height of fuel gas and carbon black in the burner hearth flue gas, unburned carbon in flue dust height, nitrous oxides concentration height; Tracing it to its cause, it is limited that mainly to be volatile matter mix with a fetch degree from air compartment, limited the after-flame of combustible; Simultaneously, airborne nitrogen and fuel bound nitrogen and oxygen reaction form nitrogen oxide under high temperature and excess oxygen.In order to address the above problem, compound secondary wind scheme is proposed on the basis of existing technology, be a kind of upgrading of conventional secondary wind; Conventional secondary wind is to mix from strengthening flue gas merely, and it is unreasonable that spout is set, and effect is undesirable.
Summary of the invention
The purpose of this utility model is exactly that a kind of chain-grate boiler of the energy-conserving and environment-protective compound overfire air device that burns is provided in order to overcome the defective that above-mentioned prior art exists.
The purpose of this utility model can be achieved through the following technical solutions: the chain-grate boiler compound overfire air device that burns, comprise chain-grate boiler, blower fan, it is characterized in that, the aditus laryngis place that forms at preceding chimney arch and back chimney arch is provided with an air main respectively, described two air mains are respectively equipped with branch wind pipe, this arm leads to burner hearth, and chimney arch above aditus laryngis and side wall place are equipped with the wind jet pipe, and wind jet pipe and the wind jet pipe on the sidewall on the described chimney arch are contour.
Described branch wind pipe is provided with three.
Described wind jet pipe is provided with two.
Described wind jet pipe is miter angle and leads to burner hearth.
Described air main, wind jet pipe all are connected with blower fan.
Compared with prior art, the utility model promotes that in conjunction with the flow behavior of fluid and the heat-transfer character in the grate-fired furnace flue gas body in the burner hearth mixes, reduce the discharging of fuel gas and carbon black, reduce unburned carbon in flue dust, reduce the discharging of nitrogen oxide, reach effect in energy saving and environmental protection.
Description of drawings
Fig. 1 is the burn structural representation of compound overfire air device of the utility model chain-grate boiler;
Fig. 2 is the burn generalized section of compound overfire air device of the utility model chain-grate boiler.
The specific embodiment
As shown in Figure 1, the utility model chain-grate boiler compound overfire air device that burns, the aditus laryngis place that forms at preceding chimney arch and back chimney arch is provided with an air main 7 respectively, at each air main 7 place three arms 9 are set respectively, liquidate in twos, promote the mixing of flue gas, help the after-flame of combustible; On the chimney arch of aditus laryngis upper position and side wall, wind jet pipe 5, wind jet pipe 6 are set respectively, are 45 degree and arrange, in burner hearth, forms the circle of an illusion, rationally cooperate the discharging of minimizing nitrogen oxide with a wind air quantity from this wind jet pipe 5 and the 6 secondary wind that penetrate.The utility model promotes that in conjunction with the flow behavior of fluid and the heat-transfer character in the grate-fired furnace flue gas body in the burner hearth mixes, and reduces the discharging of fuel gas and carbon black, reduces unburned carbon in flue dust, reduces the discharging of nitrogen oxide, reaches effect in energy saving and environmental protection.
The chain-grate boiler compound overfire air device that burns is provided with secondary wind at face arch 4 and rear arch 8 places.Coal seam 3 on traveling-grate stoker 2 from left to right successively through moisture separate out, volatile matter is separated out, the burning of volatile combustion, coke and after-flame plurality of processes.The aditus laryngis place that forms at the front and back chimney arch is provided with an air main 7 respectively, at each air main place three arms 9 is set, and liquidates in twos; On the chimney arch of aditus laryngis upper position and side wall, two wind jet pipes are set respectively, are 45 degree and arrange.
The utility model is in conjunction with the flow behavior of fluid and the heat-transfer character in the burner hearth, use for reference the installation method of chimney arch design principle and conventional secondary wind, two-layer overfire air jet is installed respectively on the chimney arch of front and back, one deck overfire air jet is installed on side wall, identical with upper strata nozzle absolute altitude on the chimney arch.
Near the aditus laryngis that the front and back chimney arch is formed, on the chimney arch of front and back, the bottom lance system of secondary wind is set respectively, this system is made up of the person in charge and arm.Air from blower fan enters in the chimney arch of front and back from the person in charge of bottom secondary wind respectively from left and right sides side wall, in chimney arch, carry out assignment of traffic, be assigned in three groups of arms, air is ejected in the burner hearth from arm, secondary wind along the arm ejection liquidates in twos, changed should the zone the flow field, flue gas mixability is vertically upward strengthened, help this regional flue gas and mix.
Upper strata secondary wind jet pipe is set on chimney arch, identical with the secondary wind jet pipe absolute altitude on the side wall of the left and right sides, 45 degree deflections along normal direction enter burner hearth respectively, in burner hearth, form an imaginary circle, the air main purpose that this position sprays into is and wind proportioning in proportion, destroy the formation condition of nitrogen oxide, reduce the generation and the discharging of nitrogen oxide.
Like this, from a wind of air compartment pass fire grate, the coal seam enters in the burner hearth, and is parallel with the volatile matter of separating out from the coal seam, the effect of chimney arch mixes before and after relying on, and promotes the after-flame with coal lighted of new coal; Local oxygen-rich area and fuel-rich regions are still arranged, and mixability is limited, and the bottom secondary wind that is provided with at chimney arch aditus laryngis place liquidates in twos, and it is vertical with the direction of flow of flue gas, strengthen the mixing of flue gas effectively, reduced the discharging of fuel gas and carbon black, reduced unburned carbon in flue dust.
The setting of chimney arch upper strata secondary wind, purpose are the dischargings that reduces nitrogen oxide.It is imagined substantially and wishes to avoid the too high and excess air coefficient of temperature and generate the situation that the zone all is in higher level at nitrogen oxide, thereby reduces the growing amount of nitrogen oxide.Top in the primary zone is provided with overfire air port, makes part secondary wind spray in the burner hearth by this spout.Know-why is to send in two stages for the air of the usefulness of will burning, at first with total air by a certain percentage the air compartment under the fire grate of primary zone send into burner hearth, make burning be in anaerobic condition, thereby reduce ignition temperature in the primary zone, generate carbon monoxide; And the volatile matter nitrogen in the fuel decompose to generate a large amount of HN, HCN, NH3 and NH2 etc., they or mutual compound generation N2 or with the nitrogen oxide generation reduction reaction that has generated, thereby suppressed the generation of nitrogen oxide.Then, part secondary wind is sent into so that fuel enters the air excess zone and after-flame from the top overfire air port, lower in this zone owing to flame temperature, thus can not generate a large amount of nitrogen oxide yet, thereby total formation of nitrogen oxides and discharge capacity decline.
Claims (5)
1. the chain-grate boiler compound overfire air device that burns, comprise chain-grate boiler, blower fan, it is characterized in that, the aditus laryngis place that forms at preceding chimney arch and back chimney arch is provided with an air main respectively, described two air mains are respectively equipped with branch wind pipe, this arm leads to burner hearth, and chimney arch above aditus laryngis and side wall place are equipped with the wind jet pipe, and wind jet pipe and the wind jet pipe on the sidewall on the described chimney arch are contour.
2. the chain-grate boiler according to claim 1 compound overfire air device that burns is characterized in that described branch wind pipe is provided with three.
3. the chain-grate boiler according to claim 1 compound overfire air device that burns is characterized in that described wind jet pipe is provided with two.
4. the chain-grate boiler according to claim 3 compound overfire air device that burns is characterized in that described wind jet pipe is miter angle and leads to burner hearth.
5. the chain-grate boiler according to claim 3 compound overfire air device that burns is characterized in that described air main, wind jet pipe all are connected with blower fan.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200598528U CN201237236Y (en) | 2008-06-17 | 2008-06-17 | Composite secondary air apparatus for chain boiler combustion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200598528U CN201237236Y (en) | 2008-06-17 | 2008-06-17 | Composite secondary air apparatus for chain boiler combustion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201237236Y true CN201237236Y (en) | 2009-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2008200598528U Expired - Fee Related CN201237236Y (en) | 2008-06-17 | 2008-06-17 | Composite secondary air apparatus for chain boiler combustion |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261668A (en) * | 2011-05-13 | 2011-11-30 | 广州迪森热能技术股份有限公司 | Secondary air distribution system of biomass steam boiler |
| CN102330993A (en) * | 2011-10-08 | 2012-01-25 | 张家港市威孚热能科技有限公司 | Composite structure for high-temperature spiral secondary air and arch in biomass fuel chain boiler |
| CN102679390A (en) * | 2012-04-28 | 2012-09-19 | 西安交通大学 | Compound furnace arch and compound secondary air structure for cooperatively controlling generation of nitrogen oxide (NOX) |
| CN103411206A (en) * | 2013-08-12 | 2013-11-27 | 上海应用技术学院 | Chain grate boiler with two staggering secondary air spray pipe layers and limestone spray pipe system |
| CN104654265A (en) * | 2015-02-12 | 2015-05-27 | 广州迪森热能设备有限公司 | Ultralow-emission nitrogen oxide biomass chain boiler |
-
2008
- 2008-06-17 CN CNU2008200598528U patent/CN201237236Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102261668A (en) * | 2011-05-13 | 2011-11-30 | 广州迪森热能技术股份有限公司 | Secondary air distribution system of biomass steam boiler |
| CN102330993A (en) * | 2011-10-08 | 2012-01-25 | 张家港市威孚热能科技有限公司 | Composite structure for high-temperature spiral secondary air and arch in biomass fuel chain boiler |
| CN102330993B (en) * | 2011-10-08 | 2013-07-10 | 张家港市威孚热能科技有限公司 | Composite structure for high-temperature spiral secondary air and arch in biomass fuel chain boiler |
| CN102679390A (en) * | 2012-04-28 | 2012-09-19 | 西安交通大学 | Compound furnace arch and compound secondary air structure for cooperatively controlling generation of nitrogen oxide (NOX) |
| CN102679390B (en) * | 2012-04-28 | 2014-07-23 | 西安交通大学 | Compound furnace arch and compound secondary air structure for cooperatively controlling generation of nitrogen oxide (NOX) |
| CN103411206A (en) * | 2013-08-12 | 2013-11-27 | 上海应用技术学院 | Chain grate boiler with two staggering secondary air spray pipe layers and limestone spray pipe system |
| CN103411206B (en) * | 2013-08-12 | 2015-07-22 | 上海应用技术学院 | Chain grate boiler with two staggering secondary air spray pipe layers and limestone spray pipe system |
| CN104654265A (en) * | 2015-02-12 | 2015-05-27 | 广州迪森热能设备有限公司 | Ultralow-emission nitrogen oxide biomass chain boiler |
| CN104654265B (en) * | 2015-02-12 | 2017-01-04 | 广州迪森热能设备有限公司 | Ultralow-emission nitrogen oxide biomass chain boiler |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090513 Termination date: 20100617 |