CN110553257A - Novel high-efficiency low NO X burner - Google Patents
Novel high-efficiency low NO X burner Download PDFInfo
- Publication number
- CN110553257A CN110553257A CN201910896383.8A CN201910896383A CN110553257A CN 110553257 A CN110553257 A CN 110553257A CN 201910896383 A CN201910896383 A CN 201910896383A CN 110553257 A CN110553257 A CN 110553257A
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- China
- Prior art keywords
- brick
- fuel spray
- spray gun
- burner
- main fuel
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- 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
-
- 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
- F23D14/48—Nozzles
- F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
-
- 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
- F23D14/70—Baffles or like flow-disturbing devices
Abstract
a novel high-efficiency low NOx burner comprises a shell, a main fuel spray gun, an auxiliary fuel spray gun, a fire pan brick, a closing-up brick and a pilot burner, wherein an inner cylinder and a flame path brick which are both hollow inside are arranged in the shell; the side wall of the inner cylinder is provided with a plurality of air inlets and pilot lights, the interior of the closing-in brick is provided with a fire pan brick, the cavity inside the fire pan brick is communicated with a combustion air channel, the interior cavity of the fire pan brick is internally provided with a main fuel spray gun, and the bottom end of the main fuel spray gun and the bottom end of the auxiliary fuel spray gun both penetrate through the bottom of the shell and are communicated with a fuel distributor with a fuel inlet at the bottom.
Description
Technical Field
The invention relates to the field of chemical equipment, in particular to a novel efficient low-NO X burner.
Background
The burner is a key part of the heating furnace, and the quality of the performance of the burner has direct influence on the operation, energy consumption, environmental protection and the like of the heating furnace. In the past, a general type burner represented by type vi and a high-efficiency type burner represented by type GX have been used in many cases. In recent years, in order to meet the requirements of GB31570-2015 'emission Standard for Industrial Petroleum refining' and GB31571-2015 'emission Standard for Industrial Petroleum chemical' which are implemented from 7.1.2015, national emission of Petroleum refining, petrochemical, water pollutants and atmospheric pollutants must all meet new standards, otherwise, the ministry of environmental protection will make strict penalties on non-standard enterprises. Therefore, the medium petrochemical industry carries out large-scale emission reduction standard-reaching transformation on the in-transit heating furnace by taking the low NOx burner as core equipment.
After the low NOx burner has been popularized, new problems arise, such as: the flame is longer, the temperature field of the radiation chamber moves upwards, the temperature of the outlet of the combustion chamber rises, the longitudinal uneven coefficient of the combustion chamber is increased, the heat load of the radiation chamber is reduced, the fuel consumption is increased, the furnace efficiency is reduced, and the like. Therefore, when the emission of pollutants such as NOx reaches the standard, the problems that how to better match the shape and height of flame with the furnace type, make the temperature field distribution of the radiation chamber more uniform, enhance the due functions of the radiation chamber, stabilize and improve the heat efficiency of the heating furnace are urgently needed to be solved.
Disclosure of Invention
The invention aims to provide a novel high-efficiency low-NO X burner.
The invention aims to realize the following technical scheme, the novel high-efficiency low-NO X burner provided by the invention comprises a shell 1, a main fuel spray gun 4, an auxiliary fuel spray gun 5, a fire pan brick 7, a closing-up brick 8 and a Changming lamp 9, wherein an inner barrel 2 and a flame path brick 6 both of which the interiors are hollow structures are arranged in the shell 1, a plurality of auxiliary fuel spray guns 5 are uniformly distributed on the outer wall of the flame path brick 6, the closing-up brick 8 with a hollow structure is arranged inside the flame path brick 6, a combustion chamber 13 used for gas combustion is formed inside the closing-up brick 8, a plurality of air inlets 3 and the Changming lamp 9 are arranged on the side wall of the inner barrel 2, the inner cavity of the inner barrel 2 is a combustion-supporting air channel communicated with the combustion chamber 13, one end of the Changming lamp 9 is arranged at a position close to the spray nozzle of the main fuel spray gun 4, and the other end of the Changming lamp;
The inside of binding off brick 8 is equipped with inside and is hollow structure and install the brazier brick 7 at the top of inner tube 2, the inside cavity of brazier brick 7 is linked together with combustion-supporting air passageway, be equipped with main fuel spray gun 4 in the inside cavity of brazier brick 7, main fuel spray gun 4 sets up the center department at inner tube 2, the top of main fuel spray gun 4 is worn out inner tube 2 and is stretched into in the cavity of brazier brick 7, the bottom of casing 1 is all worn out to the bottom of main fuel spray gun 4, the bottom of vice fuel spray gun 5 is equipped with fuel inlet 14's fuel distributor 12 and is linked together with the bottom.
Preferably, the top end of the main fuel spray gun 4 is provided with a reverse double cyclone, the reverse double cyclone comprises a first cyclone sheet 10 and a second cyclone sheet 11, and the cyclone directions of the first cyclone sheet 10 and the second cyclone sheet 11 are opposite.
Preferably, the number of the secondary fuel lances 5 is 6.
Preferably, the closing-up brick 8 is positioned above the inner part of the shell 1, and the upper sections of the outer wall of the closing-up brick 8 and the inner wall of the closing-up brick 8 are both provided with conical surfaces inclined inwards.
Preferably, the combustion chamber 13 is made of heavy alumina bricks.
Preferably, the outlet end of the firebrick 7 is located within the combustion chamber 13.
Preferably, the center of the circle enclosed by the secondary fuel spray guns 5 coincides with the main fuel spray gun 4.
Preferably, the closing-in brick 8 is made of heavy high-alumina brick.
The novel high-efficiency low-NO X burner provided by the invention has the following advantages:
1. The invention adopts the fuel grading, air grading technology and the special design of reverse double rotational flow, realizes the complete combustion under the low excess air coefficient while effectively inhibiting the generation of NOx, and better matches the flame shape and height with the furnace type structure, so that the combustion is the heat transfer service, and the guiding idea of the heat transfer to the process service is reflected and quantized.
2. The primary combustion of the invention is carried out under the condition of large excess air coefficient, the swirler is adopted to strengthen mixing, low-temperature rapid combustion is realized, and the generation of NOx is inhibited, and the secondary combustion is carried out in oxygen-poor flue gas, because the nitrogen has great inertia, when competing with carbon monoxide, hydrogen and hydrocarbon for oxygen, the nitrogen lacks the competitive power, and the generation of NOx must be effectively inhibited.
3. the design of the flame outlet necking of the combustion chamber in the embodiment enables the flue gas generated by primary combustion to be sprayed into the hearth at a high speed, and a negative pressure field is formed due to the injection effect, so that a large amount of high-temperature flue gas in the radiation chamber flows back and is disturbed, the convection heat transfer of the radiation chamber is enhanced, the residence time of the high-temperature flue gas in the radiation chamber is prolonged, the temperature field distribution of the radiation chamber is improved, the temperature of the outlet of the hearth is reduced, the mixing of secondary fuel and the flue gas generated by primary combustion is enhanced, and the reduction of the flame height and the improvement of the temperature field distribution of the.
4. According to the invention, high-speed flame is formed by the reverse double cyclones, the flame is sprayed into the radiation chamber of the heating furnace at a high speed, a negative pressure field is formed in a certain range at a spray opening to pull the smoke gas of the radiation chamber to flow back, stronger smoke gas circulation and mechanical disturbance are formed in the radiation chamber, the temperature difference of the hearth tends to be reduced uniformly from top to bottom through the high-speed backflow of the smoke gas in the radiation chamber, the heat intensity of a low-heat-intensity area of the furnace tube is improved, the heat intensity of a high-heat-intensity area is reduced, the uniformity of the heat intensity of the furnace tube is improved by the balanced temperature field, the heat transfer to a heated process medium in the furnace tube is effectively improved, the smoke gas temperature at.
The foregoing is a summary of the present invention, and for the purpose of making the technical means of the present invention more comprehensible, embodiments thereof are described in detail below with reference to the accompanying drawings.
Drawings
Fig. 1 is a schematic diagram of an embodiment of the novel high-efficiency low-NO X burner of the invention.
Fig. 2 is a top view of an embodiment of the novel high efficiency low NO X burner of the present invention.
Fig. 3 is a cross-sectional view taken at a-a in fig. 1.
Fig. 4 is a bottom view of an embodiment of the novel high efficiency low NO X burner of the present invention.
[ reference numerals ]
1-shell, 2-inner cylinder, 3-air inlet, 4-main fuel spray gun, 5-auxiliary fuel spray gun, 6-flue brick, 7-fire pot brick, 8-closing-in brick, 9-pilot lamp, 10-first vortex sheet, 11-second vortex sheet, 12-fuel distributor, 13-combustion chamber, 14-fuel inlet, 15-air inlet pipe, 16-baffle, 17-first air regulating butterfly valve and 18-second air regulating butterfly valve.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the intended purpose, the following detailed description will be made on a novel high-efficiency low-NO X burner according to the present invention with reference to the accompanying drawings and preferred embodiments.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", and the like indicate orientations or positional relationships based on the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The utility model provides a novel high-efficient low NO X combustor, includes casing 1, main fuel spray gun 4, vice fuel spray gun 5, flame path brick 6, fire pan brick 7, binding off brick 8, changming lamp 9, be equipped with flame path brick 6 and inner tube 2 in the casing 1, the inside of inner tube 2 and flame path brick 6 is hollow structure, evenly distributed has a plurality of recesses on flame path brick 6's the outer wall, all installs vice fuel spray gun 5 in every recess, in this embodiment the quantity of vice fuel spray gun 5 is 6, flame path brick 6's upper portion is equipped with the inside binding off brick 8 that has hollow structure, binding off brick 8's inboard has formed the combustion chamber 13 that uses when the gas combustion, binding off brick 8 is located the inside top of casing 1, the upper segment of binding off brick 8 outer wall and the upper segment of binding off brick 8 inner wall all are equipped with the circular conical surface of leanin, binding off brick 8 makes the flame outlet of combustion chamber 13 form the throat, binding off brick 8 adopts heavy weight high alumina binding off, the top of binding off brick 8 is higher than the top of vice fuel spray gun 5.
The side wall of the inner cylinder 2 is provided with a plurality of air inlets 3 and pilot burner lamps 9, the inner cavity of the inner cylinder 2 is a combustion-supporting air channel, and the combustion-supporting air channel is communicated with a combustion chamber 13;
The interior of the closing-up brick 8 is provided with a brazier brick 7 with a hollow structure, a cavity inside the brazier brick 7 is communicated with a combustion air channel, the brazier brick 7 is installed at the top of the inner barrel 2, the outlet end of the brazier brick 7 is positioned in the combustion chamber 13, a main fuel spray gun 4 is arranged in the cavity inside the brazier brick 7, the main fuel spray gun 4 is arranged at the center of the inner barrel 2, the top end of the main fuel spray gun 4 penetrates out of the inner barrel 2 and extends into the cavity of the brazier brick 7, the top end of the main fuel spray gun 4 is provided with a reverse double swirler, the reverse double swirler comprises a first swirl plate 10 and a second swirl plate 11, and the swirl directions of the first swirl plate 10 and the second swirl plate 11 are opposite; one end of the pilot burner 9 is arranged close to the nozzle of the main fuel spray gun 4, and the other end is fixedly arranged at the bottom of the shell 1.
The center of a circle surrounded by the auxiliary fuel spray gun 5 coincides with the main fuel spray gun 4, the bottom end of the main fuel spray gun 4 and the bottom end of the auxiliary fuel spray gun 5 both penetrate through the bottom of the shell 1 and are communicated with a fuel distributor 12, a fuel inlet 14 is arranged at the bottom of the fuel distributor 12, and a valve used for controlling the gas flow is further arranged on a pipeline for communicating the auxiliary fuel spray gun 5 with the fuel distributor 12.
The side wall of the shell 1 is provided with an air inlet pipe 15 for the inflow of combustion-supporting air, the air inlet pipe 15 is communicated with a combustion-supporting air channel in the inner barrel 2, the air inlet pipe 15 is provided with a baffle plate 16 for controlling the flow rate of the combustion-supporting air, and a first air adjusting butterfly valve 17 and a second air adjusting butterfly valve 18 for controlling the opening degree of the baffle plate 16, and the combustion principle of the novel low NO X high-efficiency combustor is as follows:
Firstly, a combustion principle of a low NOx combustor with two-stage gas supply: the fuel gas in the present invention is supplied in two separate portions by the main fuel injection lance 4 and the sub fuel injection lance 5. The primary fuel gas is mixed with all air required by combustion and combusted, and the residual oxygen in the primary combustion and the secondary fuel gas are further combusted. In the primary combustion, the amount of air is large, and rapid combustion at a low temperature is performed, so that the generation of NOx is suppressed. Afterburning is carried out in oxygen-lean flue gases (primary combustion products) because nitrogen is very inert and, when competing with carbon monoxide, hydrogen and hydrocarbons for oxygen, nitrogen lacks the ability to compete and also effectively suppresses the production of NOx.
Secondly, the combustion principle of the two-section air supply and high-speed mixed type combustor is as follows: the fuel and the primary air are combusted in the combustion chamber 13, the secondary air flows in along the periphery of the combustion chamber to cool the flame path, and the secondary air and the primary combustion flue gas are mixed at the outlet of the combustion chamber 13 and then are sprayed into the hearth for secondary combustion. The primary combustion is oxygen-poor combustion, the combustion temperature is low, the air flow speed is high, the residence time is extremely short, so that the generation of NOx can be effectively inhibited, and after the primary flue gas is injected into the hearth at high speed, a large amount of gas in the hearth flows back, so that the secondary flame with high temperature is favorably mixed with furnace gas with lower temperature, the average flame temperature is reduced, the local high temperature is prevented, and the generation amount of NOx is reduced.
Firstly, fuel is distributed into a main fuel spray gun 4 and an auxiliary fuel spray gun 5 through a fuel distributor 12, combustion-supporting air enters a reverse double swirler through a combustion-supporting air channel, the fuel is sprayed out through the main fuel spray gun 4 and then is mixed with the combustion-supporting air passing through the reverse double swirler and is combusted, the comprehensive swirl strength and the size of a backflow zone of the swirler are influenced by the difference of air quantity distribution at the reverse double swirler, the mixing uniformity of the fuel and the air is further changed, and the emission of NOx is finally influenced; in addition, the reverse double swirler is next to the nozzle of the main fuel spray gun 4, the swirling flow generates strong shearing mixing effect on the fuel, so that the fuel and air are uniformly mixed to eliminate local high temperature, the air flow speed of the main fuel area is high, the residence time of the fuel in the high temperature area is short, and the two factors are that the NOx emission is minimum.
The reverse double swirlers can enable the mixed gas to form strong swirl mixing, and the swirl mixing state can enable the flame to be kept stable, so that the mixed gas can be rapidly combusted in a high-energy combustion chamber of the combustor. The high speed flame is ejected through the closing-up brick 8 of the combustion chamber 13, but the fuel staged combustion technology is adopted outside the high energy combustion chamber, the other part of the fuel is ejected from the secondary fuel spray gun 5 to directly irradiate the main flame, the low temperature fuel lowers the temperature of the main flame and dilutes the oxygen, so that the flame is in the oxygen-deficient state to destroy the condition of generating NOx. High-speed airflow is generated when the flame body is sprayed out of the high-energy combustion chamber, and the high-temperature flue gas in the radiation chamber is forced to flow back and circulate in a negative pressure field formed by injection, so that NOx in the flue gas is decomposed, the central temperature of flame is reduced, and the generation of NOx is inhibited.
the primary combustion in the embodiment of the invention is carried out under the condition of large excess air coefficient and the swirler is adopted to strengthen mixing, low-temperature rapid combustion is realized, the generation of NOx is inhibited, and the secondary combustion is carried out in oxygen-poor flue gas, because the nitrogen has great inertia, when competing with carbon monoxide, hydrogen and hydrocarbon for oxygen, the nitrogen lacks the competitive power, and the generation of NOx is effectively inhibited.
In addition, in the embodiment, the design of the throat of the flame outlet of the combustion chamber enables the flue gas generated by primary combustion to be sprayed into the hearth at a high speed, and a negative pressure field is formed due to the injection effect, so that a large amount of high-temperature flue gas in the radiation chamber flows back and disturbs, the convection heat transfer of the radiation chamber is enhanced, the residence time of the high-temperature flue gas in the radiation chamber is prolonged, the temperature field distribution of the radiation chamber is improved, the temperature of the outlet of the hearth is reduced, the mixing of secondary fuel and the flue gas generated by primary combustion is enhanced, and the reduction of the flame height and the improvement of the temperature.
The burner in the embodiment utilizes flame to spray into the radiation chamber of the heating furnace at a high speed, a negative pressure field is formed in a certain range at the nozzle to pull the smoke backflow of the radiation chamber, strong smoke circulation and mechanical disturbance are formed in the radiation chamber, the temperature of the hearth tends to be reduced by uniform temperature difference from top to bottom through the high-speed backflow of the smoke in the radiation chamber, the heat intensity of a low-heat-intensity area of the furnace tube is improved, the heat intensity of a high-heat-intensity area is reduced, the uniformity of the heat intensity of the furnace tube is improved through a balanced temperature field, the heat transfer to a heated process medium in the furnace tube is effectively improved, the smoke temperature at the outlet of the hearth is reduced, and the heat efficiency of.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any simple modification, equivalent change and modification made by those skilled in the art according to the technical spirit of the present invention are still within the technical scope of the present invention without departing from the technical scope of the present invention.
Claims (8)
1. a novel high-efficiency low-NO X burner is characterized by comprising a shell (1), a main fuel spray gun (4), an auxiliary fuel spray gun (5), a fire pan brick (7), a closing-up brick (8) and an incandescent lamp (9), wherein an inner barrel (2) and a flame path brick (6) are arranged in the shell (1), the inner parts of the inner barrel and the flame path brick are both hollow structures, a plurality of auxiliary fuel spray guns (5) are uniformly distributed on the outer wall of the flame path brick (6), the inner side of the flame path brick (6) is provided with the closing-up brick (8) with the hollow structure, a combustion chamber (13) used for combustion of gas is formed on the inner side of the closing-up brick (8), the side wall of the inner barrel (2) is provided with a plurality of air inlets (3) and the incandescent lamp (9), the inner cavity of the inner barrel (2) is a combustion air passage communicated with the combustion chamber (13), one end of the incandescent lamp (9) is arranged at a nozzle close to the main fuel spray gun (4), and the other end;
The inside of binding off brick (8) is equipped with inside and is hollow structure and install brazier brick (7) at the top of inner tube (2), the inside cavity of brazier brick (7) is linked together with combustion air passageway, be equipped with main fuel spray gun (4) in the inside cavity of brazier brick (7), main fuel spray gun (4) set up the center department in inner tube (2), the top of main fuel spray gun (4) is worn out inner tube (2) and is stretched into in the cavity of brazier brick (7), the bottom that casing (1) was all worn out to the bottom of main fuel spray gun (4), the bottom of vice fuel spray gun (5) is equipped with fuel distributor (12) that fuel entry (14) were equipped with in the bottom and is linked together.
2. The novel high-efficiency low-NO X burner as claimed in claim 1, wherein the top end of the main fuel spray gun (4) is provided with a reverse double swirler, the reverse double swirler comprises a first swirl plate (10) and a second swirl plate (11), and the swirl directions of the first swirl plate (10) and the second swirl plate (11) are opposite.
3. The new high efficiency low NO X burner according to claim 1, wherein the number of the secondary fuel spray guns (5) is 6.
4. The novel high-efficiency low-NO X burner as claimed in claim 1, wherein the closing-in brick (8) is located above the inside of the shell (1), and the upper section of the outer wall of the closing-in brick (8) and the upper section of the inner wall of the closing-in brick (8) are both provided with inwardly inclined conical surfaces.
5. The new high efficiency low NO X burner as claimed in claim 1, wherein the combustion chamber (13) is made of heavy high alumina bricks.
6. The new high efficiency low NO X burner according to claim 1, wherein the outlet end of the firebox brick (7) is located in the combustion chamber (13).
7. The novel high-efficiency low-NO X burner according to claim 1, wherein the center of the circle surrounded by the secondary fuel spray guns (5) is coincident with the main fuel spray gun (4).
8. The novel high-efficiency low-NO X burner as claimed in claim 1, wherein the closing-in brick (8) is made of heavy high alumina brick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910896383.8A CN110553257A (en) | 2019-09-19 | 2019-09-19 | Novel high-efficiency low NO X burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910896383.8A CN110553257A (en) | 2019-09-19 | 2019-09-19 | Novel high-efficiency low NO X burner |
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| Publication Number | Publication Date |
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| CN110553257A true CN110553257A (en) | 2019-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910896383.8A Pending CN110553257A (en) | 2019-09-19 | 2019-09-19 | Novel high-efficiency low NO X burner |
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| CN (1) | CN110553257A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113864774A (en) * | 2021-09-29 | 2021-12-31 | 洛阳乐邦石化设备有限公司 | Low-NOx low-CO high-efficiency energy-saving combustor |
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| CN113864774A (en) * | 2021-09-29 | 2021-12-31 | 洛阳乐邦石化设备有限公司 | Low-NOx low-CO high-efficiency energy-saving combustor |
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Application publication date: 20191210 |