CN102175038B - Rich oxygen or pure oxygen supply high-temperature air combustion system - Google Patents
Rich oxygen or pure oxygen supply high-temperature air combustion system Download PDFInfo
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- CN102175038B CN102175038B CN2011100647569A CN201110064756A CN102175038B CN 102175038 B CN102175038 B CN 102175038B CN 2011100647569 A CN2011100647569 A CN 2011100647569A CN 201110064756 A CN201110064756 A CN 201110064756A CN 102175038 B CN102175038 B CN 102175038B
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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
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Abstract
The invention discloses a rich oxygen or pure oxygen supply high-temperature air combustion system, belonging to the technical field of heating furnaces and comprising a rich oxygen or pure oxygen device, a continuous residual heat recovering device, a heating furnace and a high-temperature air combustor, wherein the oxygen enrichment or pure oxygen device is connected with the continuous residual heat recovering device through a pipeline, the continuous residual heat recovering device is positioned in a flue of the heating furnace, an outlet of the continuous residual heat recovering device is connected with a rich oxygen or pure oxygen inlet of the high-temperature air combustor, and the high-temperature air combustor is arranged on the furnace wall of the heating furnace. The invention has the advantages of realizing rich oxygen or pure oxygen supply under different heating capacities, reducing content of nitrogen in smoke, and increasing content of triatomic molecules in furnace gas, thereby reducing residual heat carried away by the smoke and improving heat exchange efficiency in the furnace.
Description
Technical field
The invention belongs to the heating furnace technical field; The High Temperature Air Combustion system of a kind of oxygen enrichment or pure oxygen air feed is provided; Can realize the High Temperature Air Combustion of oxygen enrichment or pure oxygen air feed, be applied to using gases fuel heating furnace, make the reheating furnace energy-saving consumption reduction time reduce the discharging of oxynitrides again.
Background technology
Heating furnace production all has high energy consumption, oxidization burning loss height, produces the drawback of large quantity of exhaust gas.High energy consumption makes the fuel that heating furnace consumption is a large amount of, has wasted the energy; Higher oxidization burning loss causes the waste that is heated material; Oxynitrides in the large quantity of exhaust gas that produces forms acid rain, and environment is made a very bad impression, and has aggravated Global Greenhouse Effect simultaneously.And along with the raising of various resource prices, the strict more conservation measures and the environmental protection policy of increasingly serious and government of environmental problem, heating furnace production urgent need one cover can be saved energy and reduce the cost and reduced the combustion system of oxynitrides simultaneously again.
Utilize air-breathing in the traditional combustion, about 79% nitrogen is not participated in burning in the combustion air, forms flue gas on the contrary and takes away a part of heat that burning produces, and wastes energy.And oxygen enrichment and pure oxygen burning technology use oxygen-enriched air or pure oxygen are combustion-supporting, have reduced the nitrogen in the flue gas, have fundamentally reduced the waste heat that flue gas is taken away; Improved triatomic molecule (CO in the furnace gas simultaneously
2, H
2O) ratio, because nitrogen is transparent for heat radiation, and triatomic molecule has blackness; The increase of triatomic molecule ratio makes the furnace gas blackness improve; Thereby make radiation heat transfer reinforcement in the stove, improved furnace heat transfer efficient, reduced fuel consumption; But, make oxidization burning loss increase simultaneously because flame temperature is high.During general gas fuel combustion, the oxynitrides of generation is mainly heating power type oxynitrides, because the flame temperature of oxygen enrichment or pure oxygen burning is high, causes that heating power type oxynitrides growing amount rolls up in the burning.It is introduced; For methane fuel; The oxynitride concentration that burning produces during oxygen concentration 30% is 3 times of ordinary air combustion; The oxynitride concentration that produces during oxygen concentration 80% then is 100 times of ordinary air combustion, because the nitrogen amount that infeeds reduces, the oxynitride concentration that burning produces is 8 times of ordinary air combustion when adopting pure oxygen.But as a whole, on heating furnace, adopt traditional oxygen enrichment or pure oxygen burning technology, the flame combustion temperature is high, and the oxynitrides total amount of discharging is multiplied, and also is the main cause that causes oxidization burning loss high simultaneously.
Flame combustion temperature height, furnace gas oxygen concentration height and furnace gas nitrogen content height are to cause oxidization burning loss seriously to reach the main cause that high oxynitrides generates.Participate in obtaining high temperature after the gas preheating of burning, under the oxygen deprivation concentration conditions, can realize smooth combustion, the oxysome volume concentrations that contains of combustion zone is reduced to 4% and still can keeps smooth combustion.Adopt the High Temperature Air Combustion mode; Oxygen concentration is low in the stove, and the flame volume also so at double enlarges, and has reduced the flame peak temperature significantly; Furnace temperature evenly and be lower than the generation temperature of heating power type oxynitrides has reached the effect that oxidization burning loss is low, oxynitrides is low.But traditional combustion with meagre oxygen uses air-breathing, and about 79% nitrogen increases exhaust gas volumn in the air, takes away a large amount of waste heats, reduces the thermal efficiency, and causes the burden of follow-up heat transmission equipment and environmental protection equipment.
Therefore; Invent a kind of oxygen-enriched air or pure oxygen air feed are carried out high temperature preheating after, in burner hearth, form the burning of oxygen deprivation concentration, reduce oxidization burning loss and discharge with oxynitrides; Improve simultaneously thermal efficiency of heating furnace combustion system, energy-saving and cost-reducing and environmental protection is significant to the heating furnace field.
Summary of the invention
The object of the present invention is to provide the High Temperature Air Combustion system of a kind of oxygen enrichment or pure oxygen air feed; Utilize oxygen-enriched air or pure oxygen air feed; Reduce flue gas and take away waste heat; Strengthening furnace heat transfer utilizes the high-temperature flue gas waste heat that preheating medium (oxygen-enriched air or pure oxygen) is carried out the preheating of continuous high-efficient simultaneously; Associated working through each part of system makes fuel be issued to the High Temperature Air Combustion condition in the condition of different oxygen content air feeds, and the oxidizing atmosphere of reduction in the heating furnace to be reducing the material oxidization burning loss rate that is heated significantly, thereby solves the problem of heating furnace high energy consumption, low lumber recovery and oxynitrides discharging.
The present invention includes oxygen enrichment or pure oxygen device 1, continuous waste-heat recovery device 2, heating furnace 3, High Temperature Air Combustion device 4; Oxygen enrichment or pure oxygen device 1 are connected with continuous waste-heat recovery device 2 through pipeline; Waste-heat recovery device 2 is arranged in the heating furnace flue continuously; The outlet of waste-heat recovery device 2 is connected with the oxygen enrichment or the pure oxygen inlet of High Temperature Air Combustion device 4 continuously, and High Temperature Air Combustion device 4 is installed on heating furnace 3 furnace walls.Waste-heat recovery device 2 places the flue of heating furnace 3 continuously; Pressure 6000Pa～the 7000Pa that obtains by oxygen enrichment or pure oxygen device 1; Oxygen content gets into the continuous waste-heat recovery device 2 that places flue greater than 21% oxygen-enriched air or pure oxygen, the high-temperature flue gas that produces with heating furnace 3 heat exchange in waste-heat recovery device 2 continuously; Make the exhaust gas temperature of flue gas reduce to 250～300 ℃, simultaneously oxygen-enriched air or pure oxygen are preheating to 500～550 ℃.High-temperature oxygen-enriched air or pure oxygen, combustion gas and partial fume are mixed by High Temperature Air Combustion device 4, in stove, realize smooth combustion in the oxygen-lean atmosphere, have reduced the oxidization burning loss and the oxynitrides that are heated material when improving the thermal efficiency and have generated.
The present invention is used for High Temperature Air Combustion device air feed with oxygen-enriched air or pure oxygen, thereby reduces the content of nitrogen in the flue gas, fundamentally reduces the waste heat that flue gas is taken away, and reduces the burden of follow-up heat transmission equipment and environmental protection equipment, improves triatomic molecule (CO in the furnace gas simultaneously
2, H
2O) content, 0.795 when making the furnace gas blackness by air-breathing brought up to 0.819 of pure oxygen burning, strengthens radiation heat transfer, improves the efficiency of heating surface.By oxygen enrichment or pure oxygen device 1, the whole combustion system Collaborative Control formed of waste-heat recovery device 2, heating furnace 3, High Temperature Air Combustion device 4 continuously: oxygen enrichment or pure oxygen device are controlled oxygen content, pressure, the flow of oxygen enrichment or pure oxygen; Waste-heat recovery device is controlled oxygen enrichment or pure oxygen preheat temperature continuously; The High Temperature Air Combustion device is realized High Temperature Air Combustion; Parameters such as heating furnace feedback furnace gas temperature, furnace gas oxygen content make combustion system can realize combustion with meagre oxygen and technology heating-up temperature.
The present invention has designed a kind of High Temperature Air Combustion device; This High Temperature Air Combustion device utilizes inner flue gas of the stove to reflux; Reduce the oxygen concentration of oxygen-enriched air or pure oxygen; Realize the furnace high-temperature combustion with meagre oxygen, ignition temperature is lower than the generation temperature of heating power type oxynitrides, and special structural design makes burner under the condition of different oxygen content air feeds, still can realize stable combustion with meagre oxygen simultaneously.
Each functional structure of High Temperature Air Combustion device comprises fuel gas inlet 5, epoxy import 6, oxygen enrichment nozzle inlet 7, oxygen enrichment nozzle necking down 8, flue gas recirculation passage 9, oxygen enrichment nozzle 10, middle part epoxy passage 11, blast tube 12.Fuel gas inlet 5 is connected with fuel gas pipeline; Epoxy import 6 is connected with high-temperature oxygen-enriched or pure oxygen pipeline with oxygen enrichment nozzle inlet 7; Oxygen enrichment nozzle necking down 8 is positioned at oxygen enrichment nozzle inlet rear portion; And be connected with flue gas recirculation passage 9 and oxygen enrichment nozzle 10, middle part epoxy passage 11 is positioned at blast tube 12 peripheries, and flue gas recirculation passage 9, oxygen enrichment nozzle 10, middle part epoxy passage 11, blast tube 12 are all linked in the heating furnace burner hearth.Combustion gas gets into burner through fuel gas inlet 5; Oxygen-enriched air or pure oxygen get into burner through epoxy import 6 and oxygen enrichment nozzle inlet 7; Oxygen-enriched air or pure oxygen after undergauge 8 quickens, entrainment the flue gas in the flue gas recirculation passage 9, through reducing nozzle diameter at the oxygen enrichment nozzle passage; Regulate oxygen enrichment or pure oxygen pressure in 6000～7000Pa scope, make the gaseous mixture oxygen content of entrainmenting behind the flue gas reach 4～15%.Oxygen enrichment in the middle part epoxy passage 11 or pure oxygen mix smooth combustion with combustion gas in the blast tube 12 in the exit.Combustion gas continues the oxygen deprivation concentration gaseous mixture mixed combustion of diffusion and 10 ejections of oxygen enrichment nozzle.
Advantage of the present invention and good effect:
Special feature of the present invention is to form the various piece associated working of combustion system; Oxygen enrichment or pure oxygen air feed under the different heating ability have been realized; Reduced the nitrogen content in the flue gas; Improved the content of triatomic molecule in the furnace gas simultaneously, thereby reduced the waste heat that flue gas takes away and improved heat exchange efficiency in the stove.Another feature of the present invention is that combustion system has adopted a kind of combustion with meagre oxygen device that can efficient burning can reduce the oxynitrides discharging again, and under different oxygen content air feed conditions, still can realize stable combustion with meagre oxygen.Burner through directly taking from burner hearth the backflow flue gas but not the emptying flue gas waters down air oxygen concentration; Through the optimization on structural improvement and the parameter, improved the flow velocity of oxygen-enriched air or pure oxygen, the oxygen enrichment passage has formed bigger negative pressuren zone; The backflow flue gas can need not any power set and get into the oxygen enrichment passage under suction function; The entering of high-temperature flue gas has greatly watered down the oxygen concentration of oxygen-enriched air or pure oxygen on the one hand, to high-temperature oxygen-enriched air or pure oxygen preheating once more, burning is carried out under the oxygen deprivation state on the other hand; The oxidization burning loss rate and the oxynitrides growing amount that are heated material significantly reduce; Combustion position is better, and pressure and change nozzle diameter through controlling oxygen-enriched air or pure oxygen, under the condition of different oxygen content air feeds; Still can regulate the mixed proportion of oxygen-enriched air or pure oxygen and flue gas, thereby make gaseous mixture reach required oxygen concentration.Fuel savings of the present invention, reduce oxidization burning loss, the discharging of reduction oxynitrides, economic benefit and obvious environment benefit.
Description of drawings
Fig. 1 is a total system sketch map of the present invention.Wherein, oxygen enrichment or pure oxygen device 1, continuous waste-heat recovery device 2, heating furnace 3, High Temperature Air Combustion device 4.
Fig. 2 is the structural representation of High Temperature Air Combustion device.Wherein, fuel gas inlet 5, epoxy import 6, oxygen enrichment nozzle inlet 7, oxygen enrichment nozzle necking down 8, flue gas recirculation passage 9, oxygen enrichment nozzle 10, middle part epoxy passage 11, blast tube 12.
The specific embodiment
The present invention includes oxygen enrichment or pure oxygen device 1, continuous waste-heat recovery device 2, heating furnace 3, High Temperature Air Combustion device 4; Oxygen enrichment or pure oxygen device 1 are connected with continuous waste-heat recovery device 2 through pipeline; Waste-heat recovery device 2 is arranged in the heating furnace flue continuously; The outlet of waste-heat recovery device 2 is connected with the oxygen enrichment or the pure oxygen inlet of High Temperature Air Combustion device 4 continuously, and High Temperature Air Combustion device 4 is installed on heating furnace 3 furnace walls.Waste-heat recovery device 2 places the flue of heating furnace 3 continuously; Pressure 6000Pa～the 7000Pa that obtains by oxygen enrichment or pure oxygen device 1; Oxygen content gets into the continuous waste-heat recovery device 2 that places flue greater than 21% oxygen-enriched air or pure oxygen, the high-temperature flue gas that produces with heating furnace 3 heat exchange in waste-heat recovery device 2 continuously; Make the exhaust gas temperature of flue gas reduce to 250～300 ℃, simultaneously oxygen-enriched air or pure oxygen are preheating to 500～550 ℃.High-temperature oxygen-enriched air or pure oxygen, combustion gas and partial fume are mixed by High Temperature Air Combustion device 4, in stove, realize smooth combustion in the oxygen-lean atmosphere, have reduced the oxidization burning loss and the oxynitrides that are heated material when improving the thermal efficiency and have generated.
Oxygen enrichment or pure oxygen device 1 are according to the parameters such as preheat temperature of furnace temperature, furnace gas oxygen concentration, oxygen enrichment or pure oxygen; Provide specified pressure (6000～7000Pa), the oxygen-enriched air or the pure oxygen of oxygen content (＞21%); Be sent to continuous waste-heat recovery device 2; Low temperature oxygen-enriched air or pure oxygen absorb flue gas physics heat through heat exchange element continuously, with preheating temperature to 500～550 ℃, deliver to High Temperature Air Combustion device 4 then.The high-temperature flue gas that heating furnace 3 produces is introduced into continuous waste-heat recovery device 2, passes to heat exchange element to the physics heat of flue gas, enters atmosphere through chimney.The temperature of efficient waste-heat recovery device 2 monitoring flue gas, oxygen-enriched air or pure oxygens is regulated and is imported and exported two heat transferring mediums (flue gas, oxygen-enriched air or pure oxygen) flow velocity.Oxygen-enriched air or pure oxygen get into burner through burner epoxy import 6 and oxygen enrichment nozzle inlet 7; Oxygen-enriched air or pure oxygen at the oxygen enrichment nozzle passage after undergauge 8 quickens; Entrainment the flue gas in the flue gas recirculation passage 9; Through reduce nozzle diameter and regulate oxygen-enriched air or the pressure of pure oxygen (6000～7000P), reach requisite oxygen content (4～15%).Oxygen-enriched air in the middle part epoxy passage 11 or pure oxygen mix in the exit with combustion gas in the blast tube 12, play the effect of raising flame holding.Combustion gas continues the gaseous mixture mixed combustion of the oxygen deprivation concentration of diffusion and 10 ejections of oxygen enrichment nozzle.Because the gaseous mixture oxygen concentration reduces, the flame volume obviously increases, and temperature field in furnace is even, and temperature range reduces.The associated working of whole combustion system; Make heating furnace under the different heating ability, can realize combustion with meagre oxygen, ignition temperature is lower than the generation temperature of heating power type oxynitrides, and because oxygen-enriched air or pure oxygen air feed; The minimizing of nitrogen in the flue gas has reduced the heat that flue gas is taken away.Triatomic molecule content increases, and radiation heat transfer is strengthened greatly, has improved whole heat exchange efficiency.
Facts have proved that system compares with traditional combustion, native system is energy-conservation 35～50%, and oxidization burning loss reduces about 30%, and the oxynitrides discharging reduces by 50～80%.
Claims (1)
1. the High Temperature Air Combustion system of oxygen enrichment or pure oxygen air feed; Comprise oxygen enrichment or pure oxygen device, continuous waste-heat recovery device, heating furnace, High Temperature Air Combustion device; It is characterized in that; Oxygen enrichment or pure oxygen device (1) are connected with continuous waste-heat recovery device (2) through pipeline; Waste-heat recovery device (2) is arranged in the heating furnace flue continuously, and the outlet of waste-heat recovery device (2) is connected with the oxygen enrichment or the pure oxygen inlet of High Temperature Air Combustion device (4) continuously, and High Temperature Air Combustion device (4) is installed on heating furnace (3) furnace wall; Waste-heat recovery device (2) places the flue of heating furnace (3) continuously; Pressure 6000Pa～the 7000Pa that obtains by oxygen enrichment or pure oxygen device (1); Oxygen content is greater than 21% oxygen-enriched air or pure oxygen; Entering places the continuous waste-heat recovery device (2) of flue; High-temperature flue gas heat exchange in continuous waste-heat recovery device (2) with heating furnace (3) produces makes the exhaust gas temperature of flue gas reduce to 250～300 ℃, simultaneously oxygen-enriched air or pure oxygen is preheating to 500～550 ℃; High-temperature oxygen-enriched air or pure oxygen, combustion gas and partial fume are mixed by High Temperature Air Combustion device (4), in stove, realize smooth combustion in the oxygen-lean atmosphere, have reduced the oxidization burning loss and the oxynitrides that are heated material when improving the thermal efficiency and have generated;
Described High Temperature Air Combustion device (4) comprises fuel gas inlet (5), epoxy import (6), oxygen enrichment nozzle inlet (7), oxygen enrichment nozzle necking down (8), flue gas recirculation passage (9), oxygen enrichment nozzle (10), middle part epoxy passage (11), blast tube (12); Fuel gas inlet (5) is connected with fuel gas pipeline; Epoxy import (6) is connected with high-temperature oxygen-enriched or pure oxygen pipeline with oxygen enrichment nozzle inlet (7); Oxygen enrichment nozzle necking down (8) is positioned at oxygen enrichment nozzle inlet rear portion; And be connected with flue gas recirculation passage (9) and oxygen enrichment nozzle (10), middle part epoxy passage (11) is positioned at blast tube (12) periphery, and flue gas recirculation passage (9), oxygen enrichment nozzle (10), middle part epoxy passage (11), blast tube (12) are all linked in the heating furnace burner hearth; Combustion gas gets into burner through fuel gas inlet (5); Oxygen-enriched air or pure oxygen get into burner through epoxy import (6) and oxygen enrichment nozzle inlet (7); Oxygen-enriched air or pure oxygen after undergauge (8) quickens, entrainment the flue gas in the flue gas recirculation passage (9), through reducing nozzle diameter at the oxygen enrichment nozzle passage; Regulate oxygen enrichment or pure oxygen pressure in 6000～7000Pa scope, make the gaseous mixture oxygen content of entrainmenting behind the flue gas reach 4～15%.
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| CN103984868B (en) * | 2014-05-21 | 2016-02-24 | 华中科技大学 | A kind of oxygen-enriched combustion boiler thermal performance acquisition methods |
| CN105295962A (en) * | 2014-07-28 | 2016-02-03 | 宝山钢铁股份有限公司 | Method and device for reducing emission of NOx in waste flue gas of coke oven |
| CN104876190A (en) * | 2015-04-17 | 2015-09-02 | 安徽海德石油化工有限公司 | Oxygen-enriched combustion-supporting waste acid cracking process |
| CN105039723B (en) * | 2015-08-11 | 2017-04-05 | 中国华能集团清洁能源技术研究院有限公司 | A kind of flying dust vanadium extraction after baking device and the CFB boiler system using the device |
| CN106500094B (en) * | 2016-10-19 | 2019-06-11 | 同济大学 | A medium and high temperature flue gas circulating low nitrogen staging burner and its process |
| CN111102585A (en) * | 2019-12-17 | 2020-05-05 | 武汉汇翔热工技术有限公司 | VOCs gas incinerator with low NOx emission |
| CN113787185B (en) * | 2021-08-19 | 2023-04-14 | 鞍钢股份有限公司 | Flue gas backflow low-nitrogen ladle roaster and using method |
| CN116059798A (en) * | 2021-10-30 | 2023-05-05 | 中国石油化工股份有限公司 | Air oxygen enrichment equipment, oxygen enrichment combustion gas supply system and method |
| JP2024115023A (en) * | 2023-02-14 | 2024-08-26 | 荏原環境プラント株式会社 | Waste combustion power generation device and waste combustion power generation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6685464B2 (en) * | 2001-03-28 | 2004-02-03 | L'Air Liquide - Societe Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procedes Georges Claude | High velocity injection of enriched oxygen gas having low amount of oxygen enrichment |
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Patent Citations (4)
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|---|---|---|---|---|
| EP1704366A1 (en) * | 2003-12-16 | 2006-09-27 | L'Air Liquide Société Anon. à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude | Staged combustion method using a low-oxygen gas |
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