CN208058830U - A kind of gas fired-boiler Secondary Air coupled mode low NOx combustion system - Google Patents
A kind of gas fired-boiler Secondary Air coupled mode low NOx combustion system Download PDFInfo
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- CN208058830U CN208058830U CN201820298544.4U CN201820298544U CN208058830U CN 208058830 U CN208058830 U CN 208058830U CN 201820298544 U CN201820298544 U CN 201820298544U CN 208058830 U CN208058830 U CN 208058830U
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Abstract
The utility model is related to a kind of gas fired-boiler Secondary Air coupled mode low NOx combustion systems, including burner hearth, low-NOx combustor, main combustion gas spout and overfire air port, low-NOx combustor and main combustion gas spout are laid on burner hearth antetheca, overfire air port is laid on burner hearth sidewall successively in the form of ring of numbers, every number of rings, and the main flame range positioned at the middle front part center areas Shang Wenran, between the areas Wen Ran and middle front part side wall is arranged in furnace chamber and is located at the caudal burning-out zone of furnace chamber.When work, combustion gas is sent into furnace chamber by low-NOx combustor aditus laryngis and the classification of main combustion gas spout along airflow direction, a part of combustion air is sent into furnace chamber by NOx combustion device cyclone along airflow direction, remainder combustion air is sent into furnace chamber by several overfire air port stepped and radiallies on burner hearth sidewall, it is read due to changing tradition cooking, organic combination, rational deployment have been carried out to gas supply, the areas air feed pattern Ji Wenran, main flame range and burning-out zone, system is ensured with flue gas recirculation function, and meets ultralow nitrogen discharged standard requirement.
Description
Technical field
The utility model is related to boiler technical field of heating, the low NOx combustions of especially a kind of gas fired-boiler Secondary Air coupled mode
Burning system.
Background technology
A large amount of exhaust gas can be discharged in Industrial Boiler during fuel combustion, and NOx contained therein is a kind of important
Atmosphere pollution is one of the important arch-criminal for causing acid rain, haze.For this purpose, to the NOx content in waste air outside Industrial Boiler into
The stringent control of row has become an important routine work of environmental protection administration, and has put into effect successively a series of about boiler waste gas discharge
The Standard andRegulation of aspect.Wherein the NOx discharge requirement of gas industry boiler has been put into effect less than 30mg/Nm in Beijing3It is stringent
Standard, tight standard limited value is also being received in other domestic areas one after another, to 30mg/Nm3It draws close.In order to keep emission of NOx of boiler up to standard, mesh
Preceding industry generally reduces NOx's using low NO on Industrial Boiler with the use of the method for low nitrogen assisted combustion techniques
Discharge capacity.For the gas fired-boiler using high heat value gas such as natural gases as fuel, the low nitrogen auxiliary combustion that generally uses at present
Technology is flue gas recirculating technique, and the discharge capacity for reducing gas fired-boiler NOx has certain actual effect.But it gradually sends out in practice
Show some shortcomings, such as：Flue gas recirculation return will produce condensed water, flue gas recirculation when being mixed with combustion air
It will increase the flue gas flow in boiler when sending burner hearth back to, cause to shake, can not only influence the stability of burning, but also boiler can be influenced
The thermal efficiency causes boiler energy consumption to increase.So considering still to owe ideal from practicability and economy point.
Invention content
The purpose of this utility model be to overcome it is existing using flue gas recirculating technique as the low of low nitrogen assisted combustion techniques
Deficiency present in nitrogen combustion system provides a kind of overfire air port and is arranged on the burner hearth middle front part side wall of cigarette airflow direction,
In conjunction with the fuel gas injection track of burner, when not applying flue gas recirculating technique similarly gas industry boiler NOx can arrange
High-volume reach the gas fired-boiler Secondary Air coupled mode low NOx combustion system of smaller value.
The gas fired-boiler Secondary Air coupled mode low NOx combustion system of the utility model, main body includes burner hearth, low NOx combustion
Device, several main combustion gas spouts and several overfire air ports are characterized in that burner hearth includes furnace wall and furnace chamber, wherein：
The furnace wall includes antetheca and side wall；
It is arranged in the furnace chamber positioned at the middle front part center areas Shang Wenran, is located at the areas Wen Ran and middle front part side wall
Between main flame range and burning-out zone positioned at furnace chamber caudal part portion；
The low-NOx combustor includes the cyclone on cental axial position and coaxially radial direction is laid in cyclone
The aditus laryngis of periphery, and be embedded on the antetheca of furnace wall by the shell of aditus laryngis；
The main combustion gas spout is centered on burner axis, the isometrical furnace wall ring being laid on the outside of burner throat of annular
On face；
The overfire air port is laid in successively on demand along cigarette airflow direction in the form of ring of numbers, every number of rings and furnace chamber
On the interior main flame range design corresponding burner hearth middle front part side wall in position；
When work, combustion gas passes through the aditus laryngis that the low-NOx combustor is arranged on burner hearth antetheca and the main combustion gas
Spout classification is sent into furnace chamber in the same direction, cyclone, the residue 70%- of the 20%-70% of combustion air by the NOx combustion device
20% is classified by the overfire air port being arranged on burner hearth sidewall in incorgruous feeding furnace chamber；By the larynx of low-NOx combustor
The combustion gas and mixed in the middle front part central area of furnace chamber by the part in the 20%-70% combustion airs of cyclone feeding that mouth is sent into
Combination burning, constitutes that combustion air is sufficient, flow velocity is relatively low, fully burn convenient for combustion gas, heat fully discharges, the NOx amount pole that generates
It is few, and the areas Wen Ran that point is burning hot in stove are provided；The main combustion gas being axially sent by the main combustion gas spout on burner hearth antetheca with by
The remainder air that the cyclone of low-NOx combustor is sent into carries out the dense burning of depth, constitutes outside the areas Wen Ran of furnace chamber center
The dense combustion zone for enclosing the main flame range between dense combustion flame, with by the overfire air port on side wall along airflow direction by ring
The remaining 70%-20% combustion airs being radially sent into successively phase step by step between the dense combustion zone of main flame range periphery and middle front part side wall
Burning is met, the light combustion zone of the main flame range between the dense combustion zone of main flame range periphery and middle front part side wall is constituted；In main fire
In the light combustion zone in area, due to main combustion gas is very inadequate in combustion air early period but have in the follow-up environment supplied step by step by
Step carries out depth imperfect combustion, and heat is in company with gradually discharging, and peak temperature does not exceed 1500 DEG C, therefore thermal NO x will not
It is a large amount of to generate；The imperfect combustion high-temperature flue gas generated in main flame range, most of airflow direction along fuel gas injection track are joined
It burns with subordinate, has part that can be crossed into inertia in the areas Wen Ran and burn away, generate and be similar to flue gas interior circulating technology again
The effect of；Final uncombusted combustion gas enters combustion air abundance but temperature with cigarette airflow direction in the areas Wen Ran and main flame range
It is substantially zeroed that not high burning-out zone continues fully burning, the discharge of CO.
The utility model gas fired-boiler Secondary Air coupled mode low NOx combustion system based on above-mentioned design, due in tradition
On the basis of burner and Secondary Air technology, traditional air distribution and charge ratio theory are changed, increases the proportional quantity of Secondary Air,
Organic combination has been carried out to gas supply and air feed pattern, the areas Wen Ran are arranged and are fired on burner hearth middle front part center, and by low NOx
Burner is solely responsible for, reasonably feed combustion gas and combustion air, make combustion gas in the case that combustion air is sufficient, flow velocity it is lower into
Row fully release heat, the NOx amount of generation is few and provide the burning of ignition heat；Main flame range is reasonably laid in the areas Wen Ran
Periphery, and dense combustion zone and light combustion zone are divided into, bias combustion organically combines, and makes suitable by the main combustion gas spout on burner hearth antetheca
A large amount of main combustion gas that airflow direction is axially sent into, the part combustion air being sent into burner in dense combustion zone carries out depth
Imperfect combustion, in light combustion zone with the overfire air port that is laid in successively by ring along airflow direction on burner hearth middle front part side wall
The combustion air being radially sent into step by step carries out depth completely burned, effectively inhibits a large amount of generations of thermal NO x, and also firing
Have caused by gas partial combustion process and restore the NOx generated under the action of reproducibility intermediate product, therefore in master
The production quantity of NOx is few in flame range；In addition, in imperfect combustion high-temperature flue gas contained in main flame range, there is part can inertia
It is crossed into the areas Wen Ran and burns away, so that the technical solution of the utility model is had in existing low nitrogen assisted combustion techniques and adopted
The equivalent efficacy of flue gas recirculating technique.In conclusion the utility model carries out Secondary Air technology and boiler furnace
Coupling is integrated, has constructed a structure novel and advantages of simple, and interior layout science can not only effectively reduce thermal NO x
Production quantity, 30mg/Nm can be reached under the premise of without using flue gas recirculating technique by realizing boiler3It is ultralow nitrogen discharged,
And also ensure that the denitration efficiency of flue gas is up to the positive technique effect of 50%-90%, it is a big innovation in boiler combustion field,
It is applicable not only to burner hearth and is the boiler of fire-tube type, and be also applied for the fuel boiler of such as D types, ∏ type different types, hence it is evident that
There are very strong practicability and wide market application prospect.
Description of the drawings
Fig. 1 is the basic structure schematic diagram of the utility model embodiment；
Fig. 2 is the end structure illustration of the utility model embodiment.
In figure：
1. 11. furnace wall of burner hearth, 111. antetheca, 112. side wall, 12. furnace chamber
121. 2. low-NOx combustor of the areas Wen Ran 122. main flame range, 123. burning-out zone
21. 22. aditus laryngis of cyclone, 3. main 4. overfire air port of combustion gas spout.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples.
In fig. 1 and 2, the gas fired-boiler Secondary Air coupled mode low NOx combustion system of the utility model, main body includes stove
Thorax 1, low-NOx combustor 2, several main combustion gas spouts 3 and several overfire air ports 4, are characterized in that burner hearth 1 includes furnace wall
11 and furnace chamber 12, wherein：
The furnace wall 11 includes antetheca 111 and side wall 112；
Be arranged in the furnace chamber 12 positioned at the middle front part center areas Shang Wenran 121, be located at the areas Wen Ran 121 and in
Main flame range 122 between front side wall 112 and the burning-out zone 123 positioned at 12 caudal part portion of furnace chamber；
The low-NOx combustor 2 includes the cyclone 21 on cental axial position and coaxially radial direction is laid in rotation
The aditus laryngis 22 of 21 periphery of device is flowed, and is embedded on furnace wall antetheca 111 by the shell of aditus laryngis 22；
The main combustion gas spout 3 is centered on burner axis, the isometrical stove for being laid in 22 outside of burner throat of annular
On 11 anchor ring of wall；
The overfire air port 4 is laid in successively on demand along cigarette airflow direction in the form of ring of numbers, every number of rings and stove
The main flame range 122 designs on the corresponding burner hearth middle front part side wall in position 112 in chamber 12；
When work, combustion gas is by being arranged on burner hearth antetheca 111 aditus laryngis 22 of the low-NOx combustor 2 and described
Main combustion gas spout 3 is classified to be sent into furnace chamber 12 in the same direction, the cyclone that the 20%-70% of combustion air passes through the NOx combustion device 2
21, residue 70%-20% is classified by the overfire air port 4 being arranged on burner hearth sidewall 112 in incorgruous feeding furnace chamber 12；
A part in the combustion gas being sent by the aditus laryngis 22 of low-NOx combustor 2 and the 20%-70% combustion airs being sent by cyclone 21 exists
The middle front part central area of furnace chamber 12 is mixed and burned, and composition combustion air is sufficient, flow velocity is relatively low, fully burns convenient for combustion gas, heat
Amount fully discharges, the NOx amount of generation is few, and provides the areas Wen Ran 121 that point is burning hot in stove；By on burner hearth antetheca 111
The main combustion gas that main combustion gas spout 3 is axially sent into carries out deep with the remainder air being sent by the cyclone 21 of low-NOx combustor 2
Dense burning is spent, the dense combustion zone of the main flame range 122 between 121 periphery of the furnace chamber center areas Wen Ran and dense combustion flame is constituted,
With the remaining 70%-20% combustion airs being radially sent into successively by ring along airflow direction by the overfire air port 4 on side wall 112
In the peripheral burning of meeting step by step between middle front part side wall 112 in the dense combustion zone of main flame range 122, constitute between main flame range 122
The light combustion zone of main flame range 122 between dense combustion zone periphery and middle front part side wall 112；In the light combustion zone of main flame range 122,
Since main combustion gas is very inadequate in combustion air early period but has that gradually to carry out depth in the follow-up environment supplied step by step incomplete
Burning, heat is in company with gradually discharging, and peak temperature does not exceed 1500 DEG C, therefore thermal NO x will not be generated largely；Main flame range
The imperfect combustion high-temperature flue gas generated in 122, most of airflow direction along fuel gas injection track participate in subordinate's burning, have
Part can be crossed into the areas Wen Ran 121 with inertia and burn away, generate be similar to flue gas again in circulating technology the effect of；Steady
Final uncombusted combustion gas enters combustion air abundance with cigarette airflow direction in combustion area 121 and main flame range 122 but temperature is not high
Burning-out zone 123 continues fully to burn, and the discharge of CO is substantially zeroed.
Claims (1)
1. a kind of gas fired-boiler Secondary Air coupled mode low NOx combustion system, main body includes burner hearth（1）, low-NOx combustor（2）If,
Dry main combustion gas spout（3）With several overfire air ports（4）, it is characterized in that burner hearth（1）It include furnace wall（11）And furnace chamber
（12）, wherein：
The furnace wall（11）Including antetheca（111）And side wall（112）；
The furnace chamber（12）It is inside arranged with positioned at the middle front part center areas Shang Wenran（121）, be located at the areas Wen Ran（121）With
Middle front part side wall（112）Between main flame range（122）And it is located at furnace chamber（12）The burning-out zone in caudal part portion（123）；
The low-NOx combustor（2）It include the cyclone being located on cental axial position（21）It is laid in rotation with coaxial radial direction
Flow device（21）The aditus laryngis of periphery（22）, and pass through aditus laryngis（22）Shell be embedded in burner hearth antetheca（111）On；
The main combustion gas spout（3）Centered on burner axis, annular isometrical be laid in burner throat（22）The stove in outside
Wall（11）On anchor ring；
The overfire air port（4）It is laid in successively on demand along cigarette airflow direction in the form of ring of numbers, per number of rings and furnace chamber
（12）The interior main flame range（122）Design the corresponding burner hearth middle front part side wall in position（112）On.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820298544.4U CN208058830U (en) | 2018-03-05 | 2018-03-05 | A kind of gas fired-boiler Secondary Air coupled mode low NOx combustion system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820298544.4U CN208058830U (en) | 2018-03-05 | 2018-03-05 | A kind of gas fired-boiler Secondary Air coupled mode low NOx combustion system |
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| CN208058830U true CN208058830U (en) | 2018-11-06 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224420A (en) * | 2018-03-05 | 2018-06-29 | 上海华之邦科技股份有限公司 | A kind of gas fired-boiler Secondary Air coupled mode low NOx combustion system |
| CN109611847A (en) * | 2018-12-30 | 2019-04-12 | 上海华之邦科技股份有限公司 | A kind of fuel gas combustion system of suitable multitubular boiler |
| CN111911915A (en) * | 2020-07-29 | 2020-11-10 | 西安交通大学 | Ammonia gas low-nitrogen cyclone flameless combustion system and operation method thereof |
-
2018
- 2018-03-05 CN CN201820298544.4U patent/CN208058830U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108224420A (en) * | 2018-03-05 | 2018-06-29 | 上海华之邦科技股份有限公司 | A kind of gas fired-boiler Secondary Air coupled mode low NOx combustion system |
| CN108224420B (en) * | 2018-03-05 | 2024-04-26 | 上海博士高环保科技有限公司 | Secondary air coupling type low NOx combustion system of gas boiler |
| CN109611847A (en) * | 2018-12-30 | 2019-04-12 | 上海华之邦科技股份有限公司 | A kind of fuel gas combustion system of suitable multitubular boiler |
| CN111911915A (en) * | 2020-07-29 | 2020-11-10 | 西安交通大学 | Ammonia gas low-nitrogen cyclone flameless combustion system and operation method thereof |
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