CN1126907C - Industrial furnace with high-temperature low-oxygen air burner - Google Patents
Industrial furnace with high-temperature low-oxygen air burner Download PDFInfo
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- CN1126907C CN1126907C CN01141862A CN01141862A CN1126907C CN 1126907 C CN1126907 C CN 1126907C CN 01141862 A CN01141862 A CN 01141862A CN 01141862 A CN01141862 A CN 01141862A CN 1126907 C CN1126907 C CN 1126907C
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- combustion chamber
- air
- temperature low
- burner
- oxygen air
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The present invention relates to an industrial furnace with high temperature low oxygen air burners, which relates to high temperature low oxygen combustion techniques and devices. In view of the defects of high NOx emission, low energy utilization rate, etc. caused by the fact that low oxygen combustion techniques is not used in the industrial furnaces used at present, the industrial furnace with high temperature low oxygen air burners is provided. The present invention is characterized in that the high temperature low oxygen air burners are respectively arranged at both ends of a furnace chamber, and each burner is composed of a combustion chamber, the end cover of the combustion chamber and a cover plate arranged on the end cover, wherein the end cover of the combustion chamber is arranged at the port of the combustion chamber, the center of the end cover is provided with a circular through hole, and the end cover of the combustion chamber forms an annular channel at the end part of the combustion chamber. The burners can make high temperature air whose oxygen is diluted by return smoke gas become low oxygen air, fuel can be ignited and combusted under the condition of the low oxygen air, and the concentration of the oxygen is not more than 15%. The NOx emission is effectively reduced, and the temperature of discharged smoke is only from 150 to 200 DEG C; therefore, the loss of the discharged smoke is little, the energy utilization rate is high, and the purposes of energy saving and environmental pollution are achieved.
Description
Technical field
The invention belongs to a kind of high-temperature and low-oxygen combustion technology and equipment, particularly a kind of industrial furnace with the high-temperature low-oxygen air burner.
Background technology
The high-temperature and low-oxygen combustion technology is the direction of countries in the world industrial furnace development because it is energy-conservation all excellent with environment protecting.But in existing industrial furnace or the design in the past of China metallurgical system, the various fuel oils of making, gas-fired heater, mostly do not adopt the low oxygen combustion technology, but the air of high temperature hyperoxia concentration is directly contacted with fuel and catch fire, burn, cause NO
xThe discharge capacity height, flue gas loss is big, capacity usage ratio is low.The molten glass stove that for example uses in the prior art is exactly wherein a kind of, its structure is generally by burner hearth, fuel (water-coal-slurry or gaseous fuel) spray gun, compositions such as heat regenerator and air blast, air-introduced machine and four-way change-over valve, fuel directly catches fire, burns after spraying into burner hearth, therefore cause flue gas loss big easily, NO
xThe discharge capacity height, do not utilize energy-conservation and environmental requirement.
Summary of the invention
Purpose of the present invention and task are at the deficiencies in the prior art and defective, and a kind of industrial furnace with the high-temperature low-oxygen air burner is provided, and make it can effectively reduce NO
xDischarge capacity, and flue gas loss is little, the capacity usage ratio height, thereby reach not only energy-conservation but also environmental protection requirement.
The present invention is achieved through the following technical solutions: a kind of industrial furnace with the high-temperature low-oxygen air burner, it is mainly by burner hearth, be separately positioned on Fuel lance, the heat regenerator of the burner hearth left and right sides, and form with the four-way change-over valve that air blast, air-introduced machine and heat regenerator communicate respectively by pipeline, it is characterized in that at described burner hearth two ends one high-temperature low-oxygen air burner being set respectively, this burner is made up of combustion chamber and the cover plate that is arranged on the combustion chamber end cap of combustion chamber port and be arranged on the end cap; Described end cap is fixed on the combustion chamber wall surface, and forms a circular passage with combustion chamber wall surface, and the end cap center is provided with a central through hole.
Technique scheme forms annular jet after can making high temperature air flow into the combustion chamber from the circular passage with higher speed.Because annular jet has the very big effect of entrainmenting, thereby make and become negative pressure in the combustion chamber, at this moment a large amount of flue gas (oxygen-free) is back in the combustion chamber, entrainmented and mixing with it by high temperature air, make high temperature air be diluted into gaseous mixture, because its temperature is very high, therefore into high-temperature low-oxygen concentration, it with just catch fire, burn after fuel contacts, thereby realize the high-temperature low-oxygen air burning.
Above-mentioned circular passage also can be designed to the eddy flow passage, and swirl vane promptly is set in the circular passage.Like this, high temperature air then enters in the combustion chamber in the mode that rotatablely moves by the eddy flow passage, and it entrainments, and effect is bigger, and smoke backflow is then many more, and after high temperature air mixed, the diluted degree of air was bigger.
The present invention compared with prior art, have the following advantages and beneficial effect: the present invention is owing to be to be provided with the high-temperature low-oxygen air burner in its burner hearth rear and front end, (being in the combustion chamber) forms a recirculating zone in the confined space, the flue gas (oxygen-free) that refluxes mixes with high temperature hyperoxia concentration air, thereby the dilution that makes the oxygen of high temperature air be subjected to flue gas becomes low oxygen concentration.Because air is preheating to 800 ℃～1100 ℃, fuel can catch fire in the same old way, burn.Like this, the burning of fuel under the hypoxic air concentration conditions, its NOx discharge capacity is just lower, and its exhaust gas temperature has only 150 ℃～200 ℃, and so flue gas loss is little, the capacity usage ratio height, both energy-conservation, can reach environmental requirement again.
Description of drawings
Fig. 1 is a kind of industrial furnace structural representation with the high-temperature low-oxygen air burner.
Fig. 2 is high-temperature low-oxygen air burner structure, principle schematic.
Fig. 3 is a combustion chamber end cap schematic diagram.
Fig. 4 is the A-A cutaway view of Fig. 3.
Fig. 5 is a combustion chamber cover plate schematic diagram.
Fig. 6 is for being equipped with the eddy flow channel design schematic diagram of swirl vane in the circular passage.
The specific embodiment
Below in conjunction with accompanying drawing, describing concrete structure of the present invention, operation principle, the course of work and embodiment: Fig. 1 in detail is a kind of industrial furnace structural representation that has the high-temperature low-oxygen air burner, it is mainly by burner hearth 8, be separately positioned on the Fuel lance 6 of the burner hearth left and right sides, magnetic valve 4, poultry hot type heat exchanger 5,10, air blast 1, compositions such as air-introduced machine 3 and four-way change-over valve 2.At the two ends, the left and right sides of burner hearth 8 a high-temperature low-oxygen air burner is set respectively, this burner (Fig. 2) is made up of with the combustion chamber end cap 15 and the cover plate 16 that are arranged on the combustion chamber port combustion chamber 11-12-13-14.Combustion chamber end cap and combustion chamber wall surface form an annular inlet passageway.Fig. 3 is a kind of embodiment of the present invention, is provided with 3～5 support claws on end cap 15, can form an annular inlet passageway, and openable cover plate 16 (see figure 5)s are arranged on the end cap 15, is connected through the hinge with end cap 15.End cap 15 is fixed on the combustion chamber wall surface.High temperature air (900 ℃～1100 ℃) flows into the combustion chamber from the circular passage with the speed of 10m/s～30m/s, forms annular jet.This annular jet has the very big effect of entrainmenting in the confined space of combustion chamber, become negative pressure in the combustion chamber thereby make.At this moment a large amount of flue gas (oxygen-free) is back in the combustion chamber, is entrainmented by high temperature air and mixing with it, high temperature air is diluted into is high-temperature low-oxygen concentration gaseous mixture.Gaseous mixture depends on the distance of combustion chamber end cap 15 between combustor exit 11-14 cross section, the i.e. degree of depth of combustion chamber at the oxygen concentration of combustor exit 11-14 section.This degree of depth is big more, and then gaseous mixture is low more at the oxygen concentration of combustor exit 11-14 section; Otherwise oxygen concentration is then high more.This degree of depth can be regulated apart from the relative position in combustor exit 11-14 cross section by means of combustion chamber end cap 15.When the oil gun of homonymy was worked, cover plate 16 was closed; And when the heteropleural oil gun was worked, this cover plate leaned on the pressure of flue gas and opens, and had guaranteed that flue gas can freely enter heat regenerator (seeing Fig. 1 right side).Fuel lance 6 is installed in the center of combustion chamber, and magnetic valve 4 is housed above, and its nozzle is near 11-14 place, combustor exit cross section.
The circular passage also can be designed to eddy flow passage (see figure 5), can install swirl vane 17 in the circular passage.High temperature air enters in the combustion chamber in the mode that rotatablely moves during by eddy flow passage 18, and it entrainments, and effect is bigger, and smoke backflow is then many more, and after high temperature air mixed, the diluted degree of air was bigger.So, if will obtain the more burner of low oxygen concentration, then available the method.But generally can meet the demands with the direct current circular passage, its oxygen concentration is not higher than 15%.Direct current channel is simple with respect to the processing of eddy flow passage, manufacturing.
Its course of work is as follows: under state shown in Figure 1, cold air is supplied with by air blast 1, enter the heat regenerator 5 in figure left side through four-way change-over valve 2, in its outlet, air can be preheated to 800 ℃～1100 ℃, this high temperature air through a low oxygen concentration burner after, will catch fire, burn after meeting the fuel 7 of Fuel lance 6 ejections.Water in the parts of burner hearth 8 or the water screen tube 9 is heated, flue-gas temperature descends, but still have an appointment 900 ℃～1200 ℃, after another storage heater 10 through the figure right side, flue gas had been given heat regenerator 10 with energy, its temperature was reduced to 150 ℃～200 ℃, therefore flue gas loss is little, the capacity usage ratio height through cross valve commutation 2, is discharged by air-introduced machine 3.Behind the work certain hour, promptly when exhaust gas temperature approaches 200 ℃, switch, be about to four-way change-over valve 2 and switch to the dotted line state; Meanwhile the electromagnetic valve 4 of left side fuel is turned off, the electromagnetic valve 4 of right side fuel is opened, spray into fuel.At this moment, cold air infeeds the storage heater 10 on right side by air blast 1 through four-way change-over valve 2, and high-temperature flue gas is discharged by air-introduced machine 3 behind the storage heater 5 in left side.When the oil gun of homonymy was worked, cover plate 16 was closed; And when the heteropleural oil gun was worked, cover plate 16 leaned on the pressure of flue gas and opens, and had guaranteed that flue gas can freely enter heat regenerator (seeing Fig. 1 right side).Circulation has just realized the normal operation of high-temperature low-oxygen air burning so repeatedly.
Claims (3)
1. industrial furnace with the high-temperature low-oxygen air burner, it is mainly by burner hearth, be separately positioned on Fuel lance, the heat regenerator of the burner hearth left and right sides, and form with the four-way change-over valve that air blast, air-introduced machine and heat regenerator communicate respectively by pipeline, it is characterized in that: at described burner hearth two ends one high-temperature low-oxygen air burner is set respectively, this burner is made up of combustion chamber and the cover plate that is arranged on the combustion chamber end cap of combustion chamber port and be arranged on the end cap; Described end cap is fixed on the combustion chamber wall surface, and forms a circular passage with combustion chamber wall surface, and the end cap center is provided with a central through hole.
2. according to the described a kind of industrial furnace of claim 1, it is characterized in that being provided with swirl vane in the described circular passage with the high-temperature low-oxygen air burner.
3. according to claim 1 or 2 described a kind of industrial furnaces, it is characterized in that described combustion chamber end cap is provided with 3～5 support claws with the high-temperature low-oxygen air burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01141862A CN1126907C (en) | 2001-09-21 | 2001-09-21 | Industrial furnace with high-temperature low-oxygen air burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN01141862A CN1126907C (en) | 2001-09-21 | 2001-09-21 | Industrial furnace with high-temperature low-oxygen air burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1337547A CN1337547A (en) | 2002-02-27 |
| CN1126907C true CN1126907C (en) | 2003-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN01141862A Expired - Fee Related CN1126907C (en) | 2001-09-21 | 2001-09-21 | Industrial furnace with high-temperature low-oxygen air burner |
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| CN (1) | CN1126907C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396993C (en) * | 2005-05-27 | 2008-06-25 | 中国科学院工程热物理研究所 | Method for supplying high-temp air for direct burning pulverized-coal of pulverized-coal boiler |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6857263B2 (en) * | 2002-08-08 | 2005-02-22 | The United States Of America As Represented By The Administrator Of The Environmental Protection Agency | Low emission diesel combustion system with low charge-air oxygen concentration levels and high fuel injection pressures |
| KR101215229B1 (en) * | 2005-10-28 | 2012-12-26 | 레르 리키드 쏘시에떼 아노님 뿌르 레？드 에렉스뿔라따시옹 데 프로세데 조르즈 클로드 | - PROCESS AND APPARATUS FOR LOW-NOx COMBUSTION |
| CN102095200B (en) * | 2011-03-17 | 2012-08-08 | 北京沃克能源科技有限公司 | Double heat accumulation type high-temperature oxygen-deficient combustor with oxygen-enriched air supply |
| CN103968409B (en) * | 2014-04-08 | 2016-08-17 | 深圳市中创达热工技术有限公司 | A kind of high-temperature and low-oxygen combustion device |
| CN108087866A (en) * | 2018-01-09 | 2018-05-29 | 天津市赛洋工业炉有限公司 | A kind of ultralow NOx and high energy-saving thermal storage formula multistage burner |
-
2001
- 2001-09-21 CN CN01141862A patent/CN1126907C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100396993C (en) * | 2005-05-27 | 2008-06-25 | 中国科学院工程热物理研究所 | Method for supplying high-temp air for direct burning pulverized-coal of pulverized-coal boiler |
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| Publication number | Publication date |
|---|---|
| CN1337547A (en) | 2002-02-27 |
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