CN111520716A - Reinforced smoke internal circulation gas burner - Google Patents
Reinforced smoke internal circulation gas burner Download PDFInfo
- Publication number
- CN111520716A CN111520716A CN202010518516.0A CN202010518516A CN111520716A CN 111520716 A CN111520716 A CN 111520716A CN 202010518516 A CN202010518516 A CN 202010518516A CN 111520716 A CN111520716 A CN 111520716A
- Authority
- CN
- China
- Prior art keywords
- fuel
- primary
- internal circulation
- flue gas
- tempering
- Prior art date
- 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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Links
- 239000000779 smoke Substances 0.000 title claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 78
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000003546 flue gas Substances 0.000 claims abstract description 47
- 238000005496 tempering Methods 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 16
- 230000003750 conditioning effect Effects 0.000 claims description 9
- 239000000567 combustion gas Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 2
- 230000000171 quenching effect Effects 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 abstract description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- 239000001301 oxygen Substances 0.000 abstract description 4
- 229910052760 oxygen Inorganic materials 0.000 abstract description 4
- 150000002500 ions Chemical class 0.000 abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 2
- 239000000203 mixture Substances 0.000 abstract 1
- 239000007921 spray Substances 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/20—Premixing fluegas with fuel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/30—Premixing fluegas with combustion air
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention provides a reinforced smoke internal circulation gas burner, which utilizes the negative pressure formed by the ejection effect of high-speed jet flow of fuel and combustion-supporting air to suck smoke in a furnace into the gas burner and respectively mix the smoke with the fuel and the combustion-supporting air. Mixing the flue gas and the fuel, tempering the fuel, and reducing the heat value of the fuel; the flue gas is mixed with the combustion air to adjust and temper the combustion air and reduce the oxygen concentration of the combustion air. The modified fuel and the modified combustion-supporting air are mixed and combusted, so that the combustion temperature is effectively reduced, the oxygen concentration is reduced, the concentration of CH ion clusters is reduced, and the aim of low nitrogen emission is fulfilled.
Description
Technical Field
The invention belongs to boiler combustion equipment, and particularly relates to a reinforced flue gas internal circulation gas burner.
Background
The NOx of the high-calorific-value gas boiler is mainly thermal NOx and rapid NOx, the main factor influencing the generation of the thermal NOx is the combustion temperature, and the main factor influencing the generation of the rapid NOx is the concentration of CH ion groups. At present, the high-calorific-value gas burner mainly reduces NOx through means of staged combustion and flue gas external circulation, equipment such as a flue gas external circulation pipeline, a flue gas flowmeter and a flue gas regulating valve need to be added by means of flue gas external circulation, and the flue gas external circulation can cause liquid water in mixed air entering a combustion fan, so that an impeller of the combustion fan is damaged, and vibration and combustion pulsation are easily caused.
Aiming at the defect of flue gas external circulation, burner manufacturers are researching and utilizing flue gas internal circulation to replace flue gas external circulation, and the flue gas internal circulation does not need to be additionally provided with equipment such as a flue gas external circulation pipeline, a flue gas flowmeter and a flue gas regulating valve. The conventional flue gas internal circulation utilizes the entrainment effect of flame to mix the flue gas in the furnace with the flame, but the amount of the flue gas entrained by the method is limited, the flue gas can not enter the flame, and the effect of reducing NOx is not as good as that of flue gas external circulation. For this reason, the amount of flue gas internal circulation and the mixing of the flue gas with the flame need to be addressed.
Disclosure of Invention
The invention aims to provide a gas burner which has good combustion stability, does not use smoke external circulation and has low NOx emission.
In order to achieve the purpose, the invention adopts the following technical scheme:
a gas burner with enhanced flue gas internal circulation comprises a primary fuel nozzle, a primary air channel, a secondary air channel and a secondary combustion gas chamber; one end of the primary air channel, the secondary air channel and one end of the secondary fuel air chamber close to the hearth are respectively provided with a primary air nozzle, a secondary air nozzle and a secondary fuel nozzle; the device also comprises a primary fuel conditioning processor, an internal circulation smoke chamber and a smoke backflow channel; the primary fuel tempering processor is arranged at the inner side of the primary air channel, the inlet of the primary fuel tempering processor is communicated with the primary fuel nozzles, and a plurality of primary tempering fuel nozzles are uniformly arranged on the side wall of one end, close to the hearth, of the primary fuel tempering processor in the circumferential direction and are communicated with the primary air nozzles; the internal circulation smoke chamber is communicated with the inlet of the primary fuel conditioning processor, and two ends of the smoke backflow channel are respectively communicated with the internal circulation smoke chamber and the hearth.
Further, the secondary tempering air nozzle is also included and can be fixed on the outer wall of the primary air nozzle through a rib plate; the secondary air nozzle is positioned at the inlet of the secondary tempering air nozzle and is smaller than the size of the inlet of the secondary tempering air nozzle, so that the flue gas can enter the secondary tempering air nozzle through a gap between the secondary tempering air nozzle and the secondary air nozzle. The amount of the entering flue gas is not more than 50 percent of the secondary air volume, and the flow speed of the flue gas in the gap is not more than 340 m/s.
Furthermore, the primary fuel quenching and tempering processor and the primary fuel nozzle are arranged on the central axis in the combustor.
Further, the primary fuel conditioning processor is of a cylindrical, Venturi or Laval structure.
Furthermore, the secondary air nozzle is in a cone shape, an arc petal shape, a triangular petal shape or a rectangular petal shape.
Further, the spray hole of the primary fuel nozzle is in a circular, kidney-shaped, square or rectangular shape.
Furthermore, the secondary fuel nozzles are uniformly distributed along the circumference, and the number of the secondary fuel nozzles is more than four.
Has the advantages that: the invention is characterized in that a flue gas backflow channel and an internal circulation smoke chamber are arranged in a combustor, the momentum of fuel and combustion-supporting air is fully utilized, and the flue gas in a furnace passes through the flue gas backflow channel and the internal circulation smoke chamber by utilizing the negative pressure region generated by the injection action of high-speed jet flow of the fuel and the combustion-supporting air and the pressure difference between a hearth and the negative pressure region, further enters a fuel conditioner and a secondary conditioning air nozzle and is respectively mixed with the fuel and the combustion-supporting air. Mixing the flue gas and the fuel, tempering the fuel, and reducing the heat value of the fuel; the flue gas is mixed with the combustion air to adjust and temper the combustion air and reduce the oxygen concentration of the combustion air. The modified fuel and the modified combustion-supporting air are mixed and combusted, so that the combustion temperature is effectively reduced, the oxygen concentration is reduced, the concentration of CH ion clusters is reduced, and the aim of low nitrogen emission is fulfilled.
Drawings
FIG. 1 is a sectional view of a burner;
fig. 2 is an end view of the burner.
Reference numbers in the figures: 1. the primary fuel nozzle, 2, the primary fuel tempering processor, 3, the internal circulation smoke chamber, 4, the primary air channel, 5, the secondary air channel, 6, the secondary fuel air chamber, 7, the secondary fuel nozzle, 8, the secondary air nozzle, 9, the secondary tempering air nozzle, 10, the primary air nozzle, 11, the primary tempering fuel nozzle and 12, the smoke backflow channel.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The invention will be further explained with reference to the drawings.
The invention relates to a reinforced smoke internal circulation gas burner, which mainly comprises: the primary fuel nozzle 1 is positioned on the central axis of the combustor, the primary fuel tempering processor 2 is positioned behind the primary fuel nozzle 1, an internal circulation smoke chamber 3 at the inlet of the primary fuel tempering processor 2, a primary air channel 4 at the periphery of the primary fuel tempering processor 2, a secondary air channel 5 at the periphery of the primary air channel 4, a secondary fuel air chamber 6 and a secondary fuel nozzle 7 at the periphery of the secondary air channel 5, a secondary air nozzle 8 at the outlet of the secondary air channel 5, a secondary tempering air nozzle 9 behind the secondary air nozzle 8, a primary air nozzle 10 at the outlet of the primary air channel 4, a primary tempering fuel nozzle 11 at the outlet of the primary fuel tempering processor 2, and a flue gas backflow channel 12 connecting the internal circulation smoke chamber 3 and the hearth.
The primary fuel nozzle 1 is positioned on the axis of the primary fuel tempering processor 2, the primary fuel tempering processor 2 is of a cylindrical, Venturi or Laval structure, and the internal circulation smoke chamber 3 is connected with the inlet of the primary fuel tempering processor 2. The primary fuel conditioner 2 shown in fig. 1 is of a venturi-type construction. The primary fuel is injected into the primary fuel conditioning processor 2 at a critical speed at a high speed, and the internal circulation smoke chamber 3 is sucked into a negative pressure area. Under the action of pressure difference, flue gas in the hearth enters the internal circulation smoke chamber 3 through the flue gas backflow channel 12, is further sucked and enters the primary fuel quality adjusting processor 2, and is fully mixed with primary fuel for quality adjusting in the primary fuel quality adjusting processor 2.
The first-grade quenched and tempered fuel is sprayed into a first-grade air nozzle 10 through a first-grade quenched and tempered fuel nozzle 11, mixed with first-grade air and then sprayed into a hearth for combustion. The spray hole form of the first-stage tempering fuel nozzle 11 can be round, kidney-shaped, square or rectangular. The spray holes of the first-stage tempering fuel nozzle 11 are uniformly distributed along the circumference. The primary air nozzle 10 can be provided with a swirler, which can enhance the mixing of the primary tempering fuel and the primary air and play a role in stabilizing fire.
And secondary air is sprayed into the secondary tempering air nozzles 9 at a high speed through the secondary air nozzles 8, the periphery of the secondary air nozzles 8 and the inlet of the secondary tempering air nozzles 9 are sucked into a negative pressure area, flue gas in the hearth enters the negative pressure area under the action of pressure difference and further enters the secondary tempering air nozzles 9, and the flue gas and the secondary air are mixed and tempered in the secondary tempering air nozzles 9. The secondary air nozzle 8 can be in a cone shape, an arc petal shape, a triangular petal shape or a rectangular petal shape, the petal shape is large in circumferential area, and the secondary air nozzle has better suction, mixing and tempering effects. The secondary stage air jets 8 shown in figure 2 are of the circular petal type.
The secondary fuel nozzles 7 are evenly distributed along the circumference, and the number of the secondary fuel nozzles is more than four. The secondary fuel is sprayed out at a critical speed through a secondary fuel nozzle 7, immediately sucks the smoke in the furnace, is mixed with the smoke in the hearth for tempering, and is then mixed with secondary tempering air for combustion.
By the measure of strengthening the internal circulation of the flue gas, the aim of well reducing the emission of NOx can be achieved, and the flue gas quantity at the outlet of the hearth and the efficiency of the boiler are not influenced.
The above examples are merely illustrative of the embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (7)
1. A gas burner with enhanced flue gas internal circulation comprises a primary fuel nozzle, a primary air channel, a secondary air channel and a secondary combustion gas chamber; one end of the primary air channel, the secondary air channel and one end of the secondary fuel air chamber close to the hearth are respectively provided with a primary air nozzle, a secondary air nozzle and a secondary fuel nozzle; the device is characterized by also comprising a primary fuel conditioning processor, an internal circulation smoke chamber and a smoke backflow channel; the primary fuel tempering processor is arranged at the inner side of the primary air channel, the inlet of the primary fuel tempering processor is communicated with the primary fuel nozzles, and a plurality of primary tempering fuel nozzles are uniformly arranged on the side wall of one end, close to the hearth, of the primary fuel tempering processor in the circumferential direction and are communicated with the primary air nozzles; the internal circulation smoke chamber is communicated with the inlet of the primary fuel conditioning processor, and two ends of the smoke backflow channel are respectively communicated with the internal circulation smoke chamber and the hearth.
2. The enhanced flue gas internal circulation gas burner as recited in claim 1, further comprising a secondary quenching and tempering air nozzle; the secondary air nozzle is positioned at the inlet of the secondary tempering air nozzle and is smaller than the size of the inlet of the secondary tempering air nozzle, so that the flue gas can enter the secondary tempering air nozzle through a gap between the secondary tempering air nozzle and the secondary air nozzle.
3. The enhanced flue gas internal circulation gas burner of claim 1, wherein the primary fuel conditioning processor and the primary fuel nozzle are disposed on a central axis inside the burner.
4. The enhanced flue gas internal circulation gas burner of claim 1, wherein said primary fuel conditioning processor is of cylindrical, Venturi or Laval configuration.
5. The enhanced flue gas internal circulation gas burner as recited in claim 1, wherein said secondary air nozzle is of a cone, arc, triangular or rectangular petal shape.
6. The enhanced flue gas internal circulation gas burner of claim 1, wherein the primary fuel nozzle has a circular, kidney-shaped, square or rectangular orifice.
7. The enhanced flue gas internal circulation gas burner of claim 1, wherein said secondary fuel nozzles are circumferentially equispaced and greater than four in number.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010518516.0A CN111520716A (en) | 2020-06-09 | 2020-06-09 | Reinforced smoke internal circulation gas burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010518516.0A CN111520716A (en) | 2020-06-09 | 2020-06-09 | Reinforced smoke internal circulation gas burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111520716A true CN111520716A (en) | 2020-08-11 |
Family
ID=71913043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010518516.0A Withdrawn CN111520716A (en) | 2020-06-09 | 2020-06-09 | Reinforced smoke internal circulation gas burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111520716A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112797406A (en) * | 2021-02-25 | 2021-05-14 | 佛山市金之鑫环保科技有限公司 | High-speed energy-saving environment-friendly gas burner and combustion method |
| CN113188121A (en) * | 2021-04-01 | 2021-07-30 | 东方电气集团东方锅炉股份有限公司 | Ultralow nitrogen combustor spout, combustor and boiler |
| CN115325537A (en) * | 2022-08-19 | 2022-11-11 | 苏州达储能源科技有限公司 | Flue gas recirculation cyclone burner for coal gas |
-
2020
- 2020-06-09 CN CN202010518516.0A patent/CN111520716A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112797406A (en) * | 2021-02-25 | 2021-05-14 | 佛山市金之鑫环保科技有限公司 | High-speed energy-saving environment-friendly gas burner and combustion method |
| CN113188121A (en) * | 2021-04-01 | 2021-07-30 | 东方电气集团东方锅炉股份有限公司 | Ultralow nitrogen combustor spout, combustor and boiler |
| CN113188121B (en) * | 2021-04-01 | 2022-11-04 | 东方电气集团东方锅炉股份有限公司 | Ultralow nitrogen combustor spout, combustor and boiler |
| CN115325537A (en) * | 2022-08-19 | 2022-11-11 | 苏州达储能源科技有限公司 | Flue gas recirculation cyclone burner for coal gas |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200811 |