CN205619367U - Industrial boiler fractional combustion after burning wind hangs down nitrogen device - Google Patents
Industrial boiler fractional combustion after burning wind hangs down nitrogen device Download PDFInfo
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- CN205619367U CN205619367U CN201620397656.6U CN201620397656U CN205619367U CN 205619367 U CN205619367 U CN 205619367U CN 201620397656 U CN201620397656 U CN 201620397656U CN 205619367 U CN205619367 U CN 205619367U
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Abstract
The utility model provides an industrial boiler fractional combustion after burning wind hangs down nitrogen device, the technical problem that will solve is that the NOx who utilizes the theory reduction boiler of rich -lean combustion and fractional combustion discharges, belongs to reducing NOx emission technical field. Technical scheme is: the low nitrogen device of industrial boiler's fractional combustion after burning wind, including aditus laryngis, combustion chamber and oven, still include after burning wind induced duct and with the communicating distributing pipe of induced duct tube coupling, the induced duct is followed the oven axial sets up, and the distributing pipe encircles the combustion chamber and sets up with the axis mutually perpendicular of combustion chamber along the oven, and the tip of induced duct is connected with the outer air source pipe of combustor aditus laryngis air -supply line inclusive AND combustor and is communicated with each other, and reposition of redundant personnel introduction combustion air puts a plurality of spray tube spray repairs towards the combustion chamber wick that have through the medial surface of distributing pipe and fires wind. Show through the field test result, the utility model discloses when the gas, NOx effluent concentration can reduce by 15~45%, can reduce by 10%~25% during the fuel, can reduce by 10~50% when coal -fired, be bordering on zero and make CO fall to.
Description
Technical field
This utility model one Industrial Boiler fractional combustion afterburning wind low nitrogen device, relates to a kind of low nitrogen combustion apparatus arranging reduction afterburning wind at boiler furnace waist location, belongs to Industrial Boiler fall drainage technique field.
Background technology
Winter in 2015, domestic haze enters the high-incidence season, investigation report is issued according to the Chinese Academy of Social Sciences, each big city of north central heating, such as Beijing, Tianjin, Zhengzhou, Harbin etc. city and area, haze main source is urban heat supplying (particularly coal heating), city automobile exhaust emissions, and coal-fired, the NO of gas fired-boilerxDischarge.Environmental Protection Agency of Beijing and government put into effect local regulation (DB11/139-2015 emission standard of air pollutants for boilers), by newly-built gas industry boiler NOxDischarge numerical value is reduced to 30mg/Nm3.For meeting this requirement, now for reducing combustion gas NOxDischarge typically all uses low nitrogen diffusion combustion formula burner to add assisted combustion techniques.The lowest nitrogen diffusion combustion hierarchical segmented combustion method of formula burner application is by NOxDischarge is reduced to 60-100mg/Nm3, then with assisted combustion techniques " flue gas recirculation (FGR) technology ", further by NOxIt is reduced to 30mg/Nm3Below.But after using low NO to add assisted combustion techniques, it is typically necessary the effect that hypoxia just can have, so, more or less can produce a large amount of CO, have impact on the thermal efficiency of boiler and the stability of burning, and result in secondary pollution and easily cause boiler to shake.
Summary of the invention
The purpose of this utility model is: provide the fractional combustion afterburning wind low nitrogen device of a kind of Industrial Boiler, under the conditions of the efficiency of combustion not affecting boiler, uses bias combustion and the theory of fractional combustion, reaches low NOxThe effect of discharge and the generation of reduction CO.
For reaching above-mentioned purpose, the technical scheme is that a kind of Industrial Boiler fractional combustion afterburning wind low nitrogen device, including burner throat, combustor and furnace wall, it is characterized in that: also include afterburning wind induced duct and be connected, with described induced duct pipeline, the distribution pipe communicated, described induced duct is axially arranged along described furnace wall, the described distribution pipe axis along described furnace wall around described combustor and with described combustor is arranged in a mutually vertical manner, and the medial surface of described distribution pipe is equipped with multiple afterburning wind jet pipe towards described combustor combustion chamber.
The end of described induced duct is connected with burner throat blast pipe pipeline and communicates, and is shunted by the part combustion air in described aditus laryngis blast pipe and introduces in induced duct, described induced duct and be attached thereto and communicate distribution pipe and be placed in described combustor.
The outer gas source pipe of the end of described induced duct and burner is connected and communicates, described induced duct and being attached thereto communicates distribution pipe and is placed in outside described combustor, the medial surface of described distribution pipe is equipped with multiple afterburning wind jet pipe, the afterburning wind jet pipe relevant position that on described furnace wall, medial surface with described distribution pipe is equipped with is equipped with jet pipe installing hole, is placed in described installing hole by afterburning wind jet pipe.
It is flue gas flow rate that described distribution pipe is placed in described combustor 0.3v～1v(v) position, the i.e. scope of distance aditus laryngis end face (entry of combustion chamber) 0.3v ~ 1v, quantity least one set.
Main combustion zone (before aditus laryngis to afterburning wind introduces) is dense combustion zone, and excess air coefficient is 0.8 ~ 1, and afterburning wind is light combustion zone after introducing, and the afterburning wind introduced from described induced duct accounts for the 5～25% of the required total blast volume of burning.
Of the present utility modelGood effectIt is: required air capacity of will burning is divided into two-stage (main combustion wind and afterburning wind) and sends into burner hearth, in making main combustion zone, excess air coefficient is 0.8 ~ 1, fuel first burns under the conditions of fuel-rich (i.e. high temperature), burning velocity and temperature are reduced, it is delayed combustion process, the reducing substanceses such as C, H and CO of creating a large amount of reproducibility, reducing atmosphere is reacted with NO etc., create reproducibility higher intermediate product HCN, now, supplement burnout degree (afterburning wind) and further increase NOxTo N2Conversion ratio, reduce NOxGrowing amount in this region.
Through many places, site test results shows, this utility model afterburning wind low nitrogen technology when combustion gas, NOxConcentration of emission can reduce by 15～45%, can reduce by 10%～25%, can reduce by 10～50% time coal-fired during fuel oil；And make CO drop to be bordering on zero.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is this utility model induced duct and distributes pipe at combustor inner structure schematic diagram (distribution pipe one group)；
Fig. 2 is this utility model induced duct and distributes pipe at combustor inner structure schematic diagram (distribution pipe two groups)；
Fig. 3 is this utility model induced duct and distributes pipe at combustor external structure schematic diagram (distribution pipe two groups)；
Fig. 4 is I local induced duct, distribution pipe and nozzle structure schematic diagram (amplification) thereof in Fig. 3.
In figure: 1-aditus laryngis blast pipe；2-induced duct；3-afterburning wind jet pipe；4-combustor；5-furnace wall；6-distributes pipe.
Detailed description of the invention
Induced duct and distribution pipe structural representation in combustor when Fig. 1 and Fig. 2 is respectively distribution pipe one group and two groups, Fig. 3 is this utility model distribution pipe two groups, induced duct and distribution pipe structural representation outside combustor；Fig. 4 is I induced duct in Fig. 3, distribution pipe and afterburning wind jet pipe partial structurtes schematic diagram thereof.
Shown in figure, a kind of Industrial Boiler fractional combustion afterburning wind low nitrogen device, including burner throat 1, combustor 4 and furnace wall 5, it is characterized in that: also include afterburning wind induced duct 2 and be connected, with described induced duct 2 pipeline, the distribution pipe 6 communicated, described induced duct 2 is axially arranged along described furnace wall 5, the described distribution pipe 6 axis along described furnace wall 5 around described combustor 4 and with described combustor 4 is arranged in a mutually vertical manner, and the medial surface of described distribution pipe 6 is equipped with multiple afterburning wind jet pipe 3 towards described combustor combustion chamber.
In Fig. 1 and Fig. 2, described induced duct 2 and be attached thereto and communicate distribution pipe 6 and be placed in described combustor 4, now, induced duct 2 be referred to as in induced duct.The end of described interior induced duct is connected with burner throat 1 blast pipe pipeline and communicates, and is shunted by the part combustion air in described aditus laryngis 1 blast pipe and introduces in induced duct 2.When induced duct 2 is arranged in combustor 4, Fig. 1 distributes pipe 6 and is set to one group, distributes pipe 6 in Fig. 2 as a example by being set to two groups.Interior induced duct need to be made by heat-resisting material.
In Fig. 3, the outer gas source pipe of the end of described induced duct 2 and burner is connected and communicates, described induced duct 2 and be attached thereto and communicate distribution pipe 6 and be placed in outside described combustor 4, the medial surface of described distribution pipe 6 is equipped with multiple afterburning wind jet pipe 3, on described furnace wall 5, afterburning wind jet pipe 3 relevant position being equipped with the medial surface of described distribution pipe 6 is equipped with jet pipe 3 installing hole, is placed in described installing hole by afterburning wind jet pipe 3.Afterburning wind sprays afterburning wind by multiple jet pipes 3 towards described combustor 4 combustion chamber.
It is flue gas flow rate that described distribution pipe is placed in described combustor 0.3v～1v(v) position, i.e. the scope of distance aditus laryngis end face (entry of combustion chamber) 0.3v ~ 1v, quantity least one set, can arrange 1～6 group (layer).Often group (layer) described distribution pipe 6 can be provided with 3～30 afterburning waist wind jet pipes 3, is placed on same section.
Introduce the afterburning wind in described induced duct and account for the 5～25% of the required total blast volume of burning.
Fig. 4 is I local induced duct, distribution pipe and jet pipe partial structurtes schematic diagram (amplification) thereof in Fig. 3, and the most visible, between afterburning wind jet pipe 3 injection direction and flue gas flow direction, angle α is: 45≤α≤135.
Described " before the downstream fume gas direction of burner throat 1 to introducing afterburning wind " is main combustion zone (dense combustion zone), i.e. high temperature combustion zone, excess air coefficient fuel in 0.8～1 this region can produce substantial amounts of CO, H due to high temperature2, the reducing substances such as C and HCN, it is thus possible to the generation of suppression NO, or the NO generated is reduced to N2, reduce NOxGeneration.Being light combustion zone after introducing afterburning wind, the afterburning wind introduced from described induced duct 2 accounts for the 5～25% of the required total blast volume of burning.
This utility model simple in construction, whole combustor is considered as an organic part for combustion system, Researched of Air Staging Combustion Burning Pulverized Coal and the dense-dilute burner combustion technology Shi Zhu combustion centre district's reducing atmosphere that combines is strengthened, fuel increased in the high-temp combustion region time of staying, when using degree of depth Researched of Air Staging Combustion Burning Pulverized Coal, due to less than 1 at main combustion zone excess air coefficient, burning is carried out in the case of more much lower than theoretical air requirement, is conducive to suppressing NOxGeneration, but produce a large amount of imperfect combustion product.By afterburning wind technology, i.e. use bias combustion and the theory of fractional combustion, preferably can play significant role, reach low NOxThe effect of discharge and the generation of reduction CO.
Claims (4)
1. an Industrial Boiler fractional combustion afterburning wind low nitrogen device, including burner throat, combustor and furnace wall, it is characterized in that: also include afterburning wind induced duct and be connected, with described induced duct pipeline, the distribution pipe communicated, described induced duct is axially arranged along described furnace wall, the described distribution pipe axis along described furnace wall around described combustor and with described combustor is arranged in a mutually vertical manner, and the medial surface of described distribution pipe is equipped with multiple afterburning wind jet pipe towards described combustor combustion chamber.
A kind of Industrial Boiler fractional combustion afterburning wind low nitrogen device, it is characterized in that: the end of described induced duct is connected with burner throat blast pipe pipeline and communicates, part combustion air in described aditus laryngis blast pipe is shunted and introduces in induced duct, described induced duct and be attached thereto and communicate distribution pipe and be placed in described combustor.
A kind of Industrial Boiler fractional combustion afterburning wind low nitrogen device, it is characterized in that: the outer gas source pipe of the end of described induced duct and burner is connected and communicates, described induced duct and being attached thereto communicates distribution pipe and is placed in outside described combustor, the medial surface of described distribution pipe is equipped with multiple afterburning wind jet pipe, the afterburning wind jet pipe relevant position that on described furnace wall, medial surface with described distribution pipe is equipped with is equipped with jet pipe installing hole, is placed in described installing hole by afterburning wind jet pipe.
A kind of Industrial Boiler fractional combustion afterburning wind low nitrogen device, it is characterised in that: described distribution pipe is placed in described combustor 0.3v～1v position, quantity least one set.
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| CN201620397656.6U CN205619367U (en) | 2016-05-05 | 2016-05-05 | Industrial boiler fractional combustion after burning wind hangs down nitrogen device |
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| CN201620397656.6U CN205619367U (en) | 2016-05-05 | 2016-05-05 | Industrial boiler fractional combustion after burning wind hangs down nitrogen device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841184A (en) * | 2016-05-05 | 2016-08-10 | 上海华之邦科技股份有限公司 | Fractional combustion combustion-complementary air low-nitrogen device of industrial boiler |
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2016
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105841184A (en) * | 2016-05-05 | 2016-08-10 | 上海华之邦科技股份有限公司 | Fractional combustion combustion-complementary air low-nitrogen device of industrial boiler |
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