KR101733611B1 - Ultra-low NOx burner through internal recirculation of combustion gas and multi-fuel operation - Google Patents
Ultra-low NOx burner through internal recirculation of combustion gas and multi-fuel operation Download PDFInfo
- Publication number
- KR101733611B1 KR101733611B1 KR1020150140149A KR20150140149A KR101733611B1 KR 101733611 B1 KR101733611 B1 KR 101733611B1 KR 1020150140149 A KR1020150140149 A KR 1020150140149A KR 20150140149 A KR20150140149 A KR 20150140149A KR 101733611 B1 KR101733611 B1 KR 101733611B1
- Authority
- KR
- South Korea
- Prior art keywords
- combustion
- unit
- combustion furnace
- combustion gas
- combustor
- Prior art date
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
- F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/68—Treating the combustion air or gas, e.g. by filtering, or moistening
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The present invention relates to a low nitrogen oxide combustion apparatus for effectively reducing the nitrogen oxide contained in a combustion gas by effectively recirculating a combustion gas produced by feeding and combustion of an efficient fuel multi-stage into a combustion furnace, The combustion apparatus includes a combustor having a combustor positioned so as to penetrate a predetermined distance into the combustion furnace, wherein the combustor has a primary fuel supply unit located on the inside of the combustion furnace and a combustion chamber on the side of the combustion furnace of the primary fuel supply unit A fuel supply unit having a secondary fuel supply unit positioned therein; An air injecting portion disposed to surround the fuel supply portion and having a first enlarged portion whose diameter is enlarged in a part of the combustion furnace side and a first reduced portion whose diameter is reduced from the first enlarged portion; A combustion gas suction unit having a first suction port opened toward the combustion furnace side and a second suction port located inside the combustion furnace at an outer peripheral surface; And a recirculation inducing unit disposed between the air injecting unit and the combustion gas sucking unit to communicate with the combustion gas sucking unit.
Description
The present invention relates to a combustion apparatus, and more particularly, to a low-NOx combustion apparatus for efficiently reducing the amount of nitrogen oxides contained in a combustion gas by effectively recirculating a combustion gas produced by combustion of a fuel multi- .
At present, the main energy source of mankind is hydrocarbon fossil fuel. However, environmental pollution caused by combustion products of fossil fuels is seriously raised. In addition to nitrogen oxides (NOx) and carbon dioxide (CO2), the main sources of environmental pollution include carbon monoxide (CO) and soot generated by incomplete combustion of fuel (10). In conventional combustors using fossil fuels, it is inevitable to produce nitrogen oxides (NOx) having chemical formulas of NO and NO2 by chemical reaction at the time of combustion. The low NOx combustion technology for suppressing the generation of NOx has been developed to improve the structure of the combustor such as the mixture form of the fuel and the air and the air-fuel ratio. Nitrogen oxides generated in the combustion process react with other oxygen in the atmosphere and cause environmental problems such as smog and atmospheric ozone increase. In particular, emissions from these combustion processes are harming the environment and human health, and countries are tightening regulations on an increasingly stringent level.
The types of nitrogen oxides can be classified into thermal NOx, rapid NOx, and fuel NOx depending on the cause. The thermal nitrogen oxides are produced by the reaction of nitrogen in the air with oxygen at a high temperature of 1600 ° C or higher. Rapid nitrogen oxides are generated at the initial stage of combustion in the combustion of hydrocarbon-based fuels. The fuel nitrogen oxides react with the nitrogen components contained in the fuel Lt; / RTI > Even in the countermeasures against such nitrogen oxides, it is effective to control matters related to thermal NOx and PromptNOx since gaseous fuels such as natural gas do not contain nitrogen components in the fuel.
Nitrogen oxides cause photochemical smog and acid rain and are known to have serious effects on flora and fauna. For a long time many researchers have studied various ways to reduce NOx. As a result of this, low NOx methods currently being tried include exhaust gas recirculation, water or steam injection, multi-stage combustion of air and fuel, selective non-catalytic reduction (SNCR), selective catalytic reduction (SCR) catalytic reduction). Recently, advanced countries are attempting to recycle NOx in the afterburning region, and it is known that NOx reduction efficiency and economic efficiency are high.
However, existing technologies require a number of additional devices as elements for exhaust gas recirculation, and thus, there is a problem of economical efficiency and space securing.
As a combustor for applying a combustion gas recirculation by providing a fluid dynamic structure for recirculating fuel and combustion gas flowing in a combustion device without depending on such an additional device, there is a combustor disclosed in Korean Patent No. 1512352 proposed by the present applicant There is a low nitrogen oxide burner. However, such a combustor assumes a combustion system with a large combustion furnace, which limits the miniaturization of the apparatus.
SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for effectively controlling the flow rate of a fuel and an air mixture supplied into a combustion furnace and the flow rate of a combustion gas generated during combustion, And an object of the present invention is to provide an ultra low nitrogen oxide combustion device capable of reduction and miniaturization.
In order to attain the above object, the present invention provides a combustion apparatus including a combustor positioned to penetrate a predetermined distance into a combustion furnace, wherein the combustor includes a primary fuel supply unit located inside the combustion furnace, A fuel supply unit including a secondary fuel supply unit located on the combustion furnace side of the fuel supply unit; An air injecting portion disposed to surround the fuel supply portion and having a first enlarged portion whose diameter is enlarged in a part of the combustion furnace side and a first reduced portion whose diameter is reduced from the first enlarged portion; A combustion gas suction unit having a first suction port opened toward the combustion furnace side and a second suction port located inside the combustion furnace at an outer peripheral surface; And a recirculation inducing unit disposed between the air injecting unit and the combustion gas sucking unit to communicate with the combustion gas sucking unit.
The first intake port and the second intake port may distribute the combustion gas generated in the combustion furnace to be introduced into the combustion gas intake unit.
The air supplied to the air injecting unit is passed through the enlarging unit and the reducing unit at a faster speed than when supplied, and the fuel supplied to the primary fuel supplying unit is mixed with the air having the high speed to be supplied to the combustion furnace .
Preferably, the recirculation inducing portion includes a second reducing portion having a smaller width toward the combustion furnace at a side in communication with the combustion gas sucking portion, and a second enlarging portion having a gradually increasing width from the second reducing portion.
And the width of the second narrowing portion is narrowed by the first enlarging portion.
Preferably, the recirculation inducing portion includes a plurality of induction sleeves spaced apart from each other by a predetermined distance on a side in communication with the combustion gas suction portion, and the predetermined interval is gradually narrowed toward the recirculating induction portion side.
The combustor may further include a replenishing plate disposed at one end of the air injection port side of the combustion furnace.
The diameter of the recirculation inducing portion is A, the diameter of the first enlarging portion is A ', the length of the primary fuel injecting portion is B, the total length of the first reducing portion and the first enlarging portion is B' (A, A ', A', A ', A', C ', C', C ', C', and D respectively denote the length of the combustion chamber, the length of the first reduced portion, the diameter of the combustor, the length of penetration of the combustor into the furnace, , B, B ', C, C', D, and L) are determined by a predetermined formula.
The ultra low NOx combustion apparatus according to the present invention has a problem that the performance of a low NOx combustion apparatus is significantly reduced when a conventional low NOx combustion apparatus is applied to a combustion system having a small combustion mode, By applying the suppression combustion technology such as fuel multi-stage combustion technology and combustion gas recirculation combustion technology, it is possible to maintain the flame shape suitable for the small type combustion chamber by forming the narrow type flame, and by simultaneously applying the combustion gas recirculation technology, And an additional recirculating gas intake structure on the side of the combustor for optimization of the combustion gas recirculation is provided, thereby leading to an efficient recirculation flow structure.
1 schematically shows a low NOx combustion apparatus according to an embodiment of the present invention.
FIG. 2 and FIG. 3 are schematic views of a low nitrogen oxide combustion apparatus according to an embodiment of the present invention, and show the dimensions of the respective constitutions.
Figure 4 schematically illustrates the operation of a low NOx combustion apparatus in accordance with an embodiment of the present invention.
5 is a graph comparing the nitrogen oxide concentration in the combustion gas with the conventional combustion apparatus by the low nitrogen oxide combustion apparatus according to the embodiment of the present invention.
These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, the definitions of these terms should be described based on the contents throughout this specification.
In addition, the described embodiments are provided for illustrative purposes and do not limit the technical scope of the present invention.
Each component constituting the low nitrogen oxide combustion apparatus of the present invention can be used integrally or individually as needed. In addition, some components may be omitted depending on the usage pattern.
Hereinafter, a configuration of a low NOx combustion apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS. 1 to 4 attached hereto.
As shown in FIG. 1, the low NOx combustion apparatus according to an embodiment of the present invention can be roughly composed of a
The
The combustor may include a
The
The fuel supplied from the other side (lower side as viewed in FIG. 1) of the
The secondary
The fuel thus supplied is supplied into the
The air injecting
The
The first enlarged
That is, a part of the
The combustion
The combustion
Due to the structure of the first and
The recirculating
The
The diameter of the first
The second enlarging
As a result, the air introduced into the combustion
Specifically, the difference between the low-NOx combustion apparatus according to the present invention and the conventional combustion apparatus is as follows.
First, in order to optimize the combustion gas recirculation structure, an additional intake port on the side of the burner in addition to the conventional combustion gas recirculation inlet can be provided to optimize the recirculation flow structure suitable for the
The configuration of the
2 to 3, the diameter of the
Specifically, X shown in the above equation should be adjusted according to the capacity of the combustor as an expansion coefficient. The smaller the burner capacity, the closer to 0.8, and the larger the burner capacity, the closer it is to 1.2.
Therefore, the diameter (expanded dimension, A ') of the first
The length B 'of the first
The formula for the internal penetration length L of the
Hereinafter, the operation of the low NOx combustion apparatus according to the present invention will be described with reference to FIG.
First, the fuel supplied through the
The air supplied through the air supply unit flows through the
In the combustion apparatus using the hydrodynamic structure according to the high-speed fuel and air supply, it is important to control the flow rate of the fuel and the air as described above. However, And it is also important to effectively control the recirculation thereof. As described above, the combustion gas generated by the combustion flows to the upper portion of the
The combustion gas introduced into the combustion
As shown in FIG. 5, it was confirmed that the concentration of nitrogen oxide contained in the combustion gas was greatly reduced through the combustion of the combustion gas through the high-speed fuel supply and the recirculation of the combustion gas.
As described above, according to the ultra low nitrogen oxide combustion apparatus of the present invention, in the conventional low nitrogen oxide combustion apparatus, the performance of the low nitrogen oxide combustion apparatus is significantly lowered when the combustion system is applied to a small combustion furnace type By adopting the suppression combustion technology such as air multi-stage combustion technology, fuel multi-stage combustion technology, and combustion gas recirculation combustion technology, it is possible to maintain the flame shape suitable for small type combustion chamber by forming narrow type flame and to simultaneously apply the combustion gas recirculation technology This allows effective reduction of nitrogen oxides and an efficient recirculation flow structure by providing an additional combustion gas suction structure on the side of the combustor for combustion gas recycle optimization.
Although the preferred embodiments of the present invention have been described, the present invention is not limited to the specific embodiments described above. It will be apparent to those skilled in the art that numerous modifications and variations can be made in the present invention without departing from the spirit or scope of the appended claims. And equivalents should also be considered to be within the scope of the present invention.
10: Combustion furnace
100: fuel supply unit
110: Primary fuel injection part
120: Secondary fuel injection part
200:
210: first magnifying section
220: second magnifying unit
300: recirculation induction part
310:
320:
400: Combustion gas suction part
410: first inlet
420: second inlet
Claims (8)
The combustor
(100) having a primary fuel injection portion (110) located inside the combustion furnace (10) and a secondary fuel injection portion (120) located on the combustion path side of the primary fuel injection portion );
A first enlarged portion 210 disposed to surround the fuel supply portion 100 and having a diameter enlarged by a part of the combustion furnace 10 side portion and a first enlarged portion 210 having a diameter reduced from the first enlarged portion 210, (200) having an air injection port (220);
(420) having a first suction port (410) whose tip is opened toward the combustion furnace (10) side and a part of an outer circumferential surface penetrating a predetermined length into the combustion furnace (10) (400); And
And a recirculation inducing unit 300 positioned between the air injecting unit 200 and the combustion gas intake unit 400 to communicate with the combustion gas intake unit 400,
A combustion gas generated in the combustion furnace 10 and flowing to the combustor side flows into the first intake port 410 and the second intake port 420 and flows through the recirculation induction unit 300 to the combustion furnace 10 ) ≪ / RTI >
Low nitrogen oxide combustion apparatus.
The air supplied to the air injecting unit 200 passes through the first enlarging unit 210 and the first reducing unit 220 in order,
Wherein the fuel supplied to the primary fuel supply unit (100) is mixed with the air having the high speed and supplied to the combustion furnace (10)
Low nitrogen oxide combustion apparatus.
The recirculation inducing unit 300 may include:
A second reducing part 310 which is narrowed in width from the combustion gas suction part 400 side toward the combustion furnace 10 side and a second enlarging part 310 which is gradually wider from the second reducing part 310 320,
Low nitrogen oxide combustion apparatus.
The second narrowing portion 310 is formed by the first enlarging portion 210,
Low nitrogen oxide combustion apparatus.
The recirculation inducing unit 300 may include:
And a plurality of induction sleeves (331, 332) spaced apart from each other by a predetermined distance on a side communicating with the combustion gas suction unit (400), the predetermined interval being gradually narrower toward the recirculation induction unit (300)
Low nitrogen oxide combustion apparatus.
The combustor
(10) side of the air injection part,
Low nitrogen oxide combustion apparatus.
The diameter of the recirculation inducing portion 300 is A, the diameter of the first enlarging portion 210 is A ', the length of the primary fuel injecting portion 110 is B, the length of the first reducing portion 220, The length of the first enlarged portion 210 is denoted by B ', the length of the first reduced portion 220 is denoted by C, the diameter of the first reduced portion 220 is denoted by C', the diameter of the combustor is denoted by D, (A, A ', B, B', C, C ', D, and L) is determined by the following equation when the penetration interval to the combustion furnace 10 is L and the expansion coefficient is X ,
Low nitrogen oxide combustion apparatus.
Here, X is 0.8? X? 1.2
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150140149A KR101733611B1 (en) | 2015-10-06 | 2015-10-06 | Ultra-low NOx burner through internal recirculation of combustion gas and multi-fuel operation |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020150140149A KR101733611B1 (en) | 2015-10-06 | 2015-10-06 | Ultra-low NOx burner through internal recirculation of combustion gas and multi-fuel operation |
Publications (2)
Publication Number | Publication Date |
---|---|
KR20170041299A KR20170041299A (en) | 2017-04-17 |
KR101733611B1 true KR101733611B1 (en) | 2017-05-25 |
Family
ID=58703145
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020150140149A KR101733611B1 (en) | 2015-10-06 | 2015-10-06 | Ultra-low NOx burner through internal recirculation of combustion gas and multi-fuel operation |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR101733611B1 (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102261150B1 (en) * | 2019-09-20 | 2021-06-07 | 한국생산기술연구원 | A Low-NOx combustor capable of internal recirculation of flue gas by using venturi effect through improvement of burner structure |
KR102242174B1 (en) | 2019-10-16 | 2021-04-20 | 한국에너지기술연구원 | Pollution reduction system of cfbc and its control method |
CN110822429A (en) * | 2019-12-11 | 2020-02-21 | 青岛新力通热工科技有限公司 | Adjustable circulation injection type low-nitrogen combustor |
KR102609506B1 (en) * | 2023-06-23 | 2023-12-05 | 주식회사 대열보일러 | Combustion burner and combustion boiler including the same |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008116077A (en) * | 2006-11-01 | 2008-05-22 | Takuma Co Ltd | Gas burner |
KR101203189B1 (en) * | 2012-03-29 | 2012-11-21 | 한국생산기술연구원 | Burner for generating reduced nitrogen oxide through forced internal recirculation of flue gas |
KR101443855B1 (en) * | 2012-03-20 | 2014-09-23 | 주식회사 대열보일러 | A LO-NOx burner of eco-friendly for NOx decrease |
-
2015
- 2015-10-06 KR KR1020150140149A patent/KR101733611B1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008116077A (en) * | 2006-11-01 | 2008-05-22 | Takuma Co Ltd | Gas burner |
KR101443855B1 (en) * | 2012-03-20 | 2014-09-23 | 주식회사 대열보일러 | A LO-NOx burner of eco-friendly for NOx decrease |
KR101203189B1 (en) * | 2012-03-29 | 2012-11-21 | 한국생산기술연구원 | Burner for generating reduced nitrogen oxide through forced internal recirculation of flue gas |
Also Published As
Publication number | Publication date |
---|---|
KR20170041299A (en) | 2017-04-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP6466142B2 (en) | Ultra-low nitrogen oxide combustion apparatus by internal recirculation of combustion gas and operation method thereof | |
JP6703626B2 (en) | Ultra low nitrogen oxide combustion device | |
JP6722661B2 (en) | Ducted fuel injection | |
KR101733611B1 (en) | Ultra-low NOx burner through internal recirculation of combustion gas and multi-fuel operation | |
US20070089419A1 (en) | Combustor for gas turbine engine | |
KR101583509B1 (en) | A Burner for generating reduced nitrogen oxide | |
KR101203189B1 (en) | Burner for generating reduced nitrogen oxide through forced internal recirculation of flue gas | |
KR20010039760A (en) | FUEL DILUTION METHODS AND APPARATUS FOR NOx REDUCTION | |
CN107477579B (en) | Low nitrogen oxide burner | |
KR100810033B1 (en) | A pre-mixing burner device for exhaust gas recirculation | |
CN109073225B (en) | Ultra-low emission combustor | |
KR101885413B1 (en) | A gas turbine combustor swirler | |
CN108738333B (en) | Composite low nitrogen oxide burner | |
US5681159A (en) | Process and apparatus for low NOx staged-air combustion | |
KR102068037B1 (en) | Low NOx combustion device through premixing and diffusion flame formation | |
KR101730545B1 (en) | Low NOx burner | |
KR102541210B1 (en) | Micro hydrogen combustion burner for gas turbines that can reduce nitrogen oxides | |
KR102317704B1 (en) | Low NOx Burner comprising recirculation ports | |
KR101067710B1 (en) | Premixed type pure oxygen combustor | |
US20160102857A1 (en) | Swirl jet burner | |
JPH05203123A (en) | Low nox emission burner | |
KR101822997B1 (en) | Low NOx burner | |
JP2006090602A (en) | Lobe mixer and premixer | |
JPH066952U (en) | Gas turbine combustor | |
KR100955537B1 (en) | Reburning System |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
E701 | Decision to grant or registration of patent right |