CN201062796Y - Apparatus for secondary pre-heating combustion air for oil gas multifuel combustion heating furnace - Google Patents
Apparatus for secondary pre-heating combustion air for oil gas multifuel combustion heating furnace Download PDFInfo
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- CN201062796Y CN201062796Y CNU2007200686685U CN200720068668U CN201062796Y CN 201062796 Y CN201062796 Y CN 201062796Y CN U2007200686685 U CNU2007200686685 U CN U2007200686685U CN 200720068668 U CN200720068668 U CN 200720068668U CN 201062796 Y CN201062796 Y CN 201062796Y
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- heat exchanger
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- heating furnace
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- combustion 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
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Abstract
The utility model discloses a combustion air secondary preheating device for an oil gas mixed combustion heating furnace, which is form by serial connection of a first-stage air heat exchanger (2) and a second-stage air heat exchanger (1); wherein, the outlet of the first-stage air heat exchanger (2) is connected with the inlet of the air heat exchanger (1) with communicating pipes, so that the first and second heat exchangers are integrated into one piece, to form a four-cycle heat exchanger to provide twice heat exchanges for combustion air. The utility model improves the safety and hot working efficiency of the system operation, reduces the temperature of the flue gas discharge, achieves energy-saving and waste reduction and protects fine environmental effect.
Description
Technical field
The utility model belongs to the plant equipment field, particularly a kind of oil-gas mixed burning heating furnace combustion air secondary pre-heating device.
Background technology
Steel rolling mill of Baosteel Group Nantong Steel ﹠ Iron Co., Ltd. is since implementing the oil-gas mixed burning transformation to heating furnace in September, 2005, system layout is unreasonable, the low influence that reaches factors such as dustiness height of blast furnace gas calorific value because of fume afterheat utilizes, cause the average heating efficiency of heating furnace to be had only about 110t/h, do not reach designing requirement, the mixing proportion of heavy oil and blast furnace gas reaches 6: 4; Furnace thermal efficiency is low, and ton steel heavy oil consumption is up to 14kg.
Present air heat exchanger, gas change heater each cover, warm-up combustion-supporting air (being preheating to about 350 ℃) and blast furnace gas (preheat temperature generally is no more than 200 ℃) respectively.But blast is on the low side behind the gas change heater, 150 ℃ of the frequent less thaies of gas preheating temperature, and thermal efficiency of heating furnace is low, and heavy oil consumption can reach 14kg/t even higher.Blowing out inspection discovery gas change heater is met the former row's heat-transfer pipes of high-temperature flue gas side heat transfer tube group middle part gross distortion.Along pipe the corrosion peeling and the fine cracks of varying length are arranged axially, be shaped as strip and circle.The outside turnup of peeling, and this place's tubing to have eroded to less than 1～2mm thick, can break off with the fingers and thumb disconnected with hand.The heat transfer group is met the flue gas direction serious dust stratification, and the part blocks, collected specimens pH value average out to 4.0.And in inspection, find the top distortion, and the serious protruding drum of following bellows, the weld bond cracking, gas change heater leaks out on a small quantity.
Tube Sheet of Heat Exchanger group Material Selection directly has influence on the effect of air secondary preheating technology.At present, domestic air heat exchanger selection is in the majority with straight carbon steel aluminising and stainless steel 1Cr18Ni9Ti person, and manufacturing process is comparative maturity also.The former is used for the main body heat exchanger more, and latter's maximum operation (service) temperature is no more than 800 ℃, is usually used in the protection tube group near the high-temperature flue gas side.Sometimes also use the material of stainless steel aluminizing pipe as high-temperature heat-exchanging protection tube group.
Summary of the invention
The purpose of this utility model provides a kind of oil-gas mixed burning heating furnace combustion air secondary pre-heating device, and this equipment can reduce heavy oil consumption, improves the reheat furnace system thermal efficiency.
A kind of oil-gas mixed burning heating furnace combustion air secondary pre-heating device (Fig. 1), comprise by main air heat exchanger 2 and secondary air heat exchanger (1) and being composed in series, the outlet of main air heat exchanger 2 connects with cross over pipe with secondary air heat exchanger 1 inlet, one, two two-stage heat exchangers are combined together, form the four-stroke heat exchanger combustion air is carried out twice heat exchange, cold air at first enters main air heat exchanger 2, is preheated to behind the low hot-air entering secondary air heat exchanger 1 and finishes the secondary preheating.
The material of described air secondary preheating heat exchanger is that preceding 4 rows are the Cr25Ni20Si seamless steel pipe; 5-15 row is 1Cr18Ni9Ti aluminising seamless steel pipe; 16-62 row is 20# aluminising seamless steel pipe.
The form of described air secondary preheating heat exchanger is a four-stroke quadrature reflux type, and suspension type is installed.
The power that the height of air preheating temperature of the present utility model carries out the fuel combustion reaction has a significant impact.For the heating furnace that acts as a fuel with heavy oil and blast furnace gas, improve combustion air temperature and seem particularly important, because the calorific value of blast furnace gas own is low, be generally less than 3000kJ/m
3If the temperature of combustion air is higher, when itself and mist of oil cross when mixing, because the flammable mixture temperature that forms is higher, its combustion velocity is very fast, just can reach completing combustion with less coefficient of excess air in the blink that mist of oil is flowed in burner hearth, flame temperature is higher and stable.The raising of flame space temperature and the stable burning velocity that can accelerate mist of oil and air conversely again form the benign cycle of fuel combustion.Long-range for this reason air secondary preheating technology.
The air secondary preheating is promptly carried out twice heat exchange by the series connection of two-stage heat exchanger with stove exit gas and combustion air, improves combustion air temperature, and then the raising ignition temperature reaches purpose energy-conservation, volume increase.Adopt the final exhaust temperature of oil-gas mixed burning heating-furnace exit gas behind the air secondary preheating technology to drop to about 250 ℃ from 350 ℃, the temperature of combustion air then can be elevated to more than 650 ℃ from 350 ℃.100 ℃ of the every raisings of air preheating temperature can make the fuel combustion temperature increase about 50 ℃, increase output about 2%.When combustion air is 650 ℃, make the ignition temperature of heating furnace increase by 150 ℃, increase output 6%.
Air secondary preheating technology of the present utility model, be to adopt two cover air heat exchangers respectively air to be carried out gradient-heated, the first echelon air heat exchanger is placed in the position of rough gas heat exchanger, the second echelon air heat exchanger still is placed in the position of former air heat exchanger, and the outlet of first heat exchanger connects with cross over pipe with the inlet of second heat exchanger.One, two two-stage heat exchangers are combined together, form the four-stroke heat exchanger, realize air secondary preheating purpose, simultaneously coal gas normal temperature is fed burner hearth.For pursuing the heat exchanger heat exchange efficiency, reduce investment, shorten payoff period, though novel jet flow heat exchanger has all advantages, its air side drag losses is excessive, therefore, the metal pipe type heat exchanger is still adopted in technological improvement this time.Parameter sees Table (1):
The heat exchanger major parameter of table 1 air secondary preheating technology
The Cr25Ni20Si that heat exchanger protection tube group adopts is a kind of have very high corrosion resistance, good heat-conductive characteristic and very little heat resisting steel of thermal coefficient of expansion, and the long-term work temperature can reach 1200 ℃, the cost performance height.
The beneficial effects of the utility model:
(1) bluster is mobile in the stove improves, and fuel combustion is abundant, and length of flame growth, and rigidity strengthens, the brightness height, and the thermal efficiency of stove is improved.
(2) coal gas directly feeds burner hearth, only air is carried out the secondary preheating, has avoided gas change heater to place high-temperature flue preferably, and easily the accident of leaking, exploding has guaranteed the heating furnace safe and highly efficient operation.
(3) fuel consumption obviously reduces.Unit consumption of heavy oil is by the not enough 2kg/t that improves after preceding 7.92kg/t is reduced to improvement, and the ton steel is saved heavy oil 6kg, has obtained favorable economic benefit.
(4) heavy oil consumption minimizing, burning condition improve.The heating furnace SO2 emissions reduce, chimney over-emitting black exhaust phenomenon obviously reduces, and have reduced the pollution to environment, have good environmental benefit.
The operational factor contrast saw Table (2) two-stage air heat exchanger and improves the back operation so far before and after the air secondary preheating technology improved, and the heating furnace operation is normal, and field observation Tube Sheet of Heat Exchanger group does not have the flexural deformation phenomenon, and each technical parameter operation is normal.
The utility model has overcome the adverse effect of the special operation condition heat exchanging device performance of this type body of heater.Improve the security and the hot working efficiency of system's operation, reduced the temperature of fume emission, obtained good result energy-saving and cost-reducing and the protection environment
Description of drawings
Fig. 1 oil-gas mixed burning heating furnace combustion air secondary pre-heating device schematic diagram.
The a-hot-air, the b-cold air
The relation of Fig. 2 air preheating temperature and saving of fuel percentage.
The relation curve of Fig. 3 air preheating temperature and theoretical temperature combustion.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the utility model is described and be not used in the restriction scope of the present utility model.Should be understood that in addition those skilled in the art can make various changes or modifications the utility model after the content of having read the utility model instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
Embodiment 1
A kind of oil-gas mixed burning heating furnace combustion air secondary pre-heating device is composed in series by main air heat exchanger 2 and secondary air heat exchanger 1, and the outlet of main air heat exchanger 2 connects with cross over pipe with secondary air heat exchanger 1 inlet.One, two two-stage heat exchangers are combined together, form the four-stroke heat exchanger combustion air is carried out twice heat exchange, cold air at first enters main air heat exchanger 2, be preheated to behind the low hot-air entering secondary air heat exchanger 1 and finish the secondary preheating, described air heat exchanger is the metal pipe type heat exchanger, and preceding 4 rows are the Cr25Ni20Si seamless steel pipe; 5～15 rows are 1Cr18Ni9Ti aluminising seamless steel pipe; 16 ~ 62 rows are 20# aluminising seamless steel pipe.
Claims (4)
1. oil-gas mixed burning heating furnace combustion air secondary pre-heating device, it is characterized in that: be composed in series by main air heat exchanger (2) and secondary air heat exchanger (1), the outlet of main air heat exchanger (2) connects with cross over pipe with secondary air heat exchanger (1) inlet.
2. a kind of oil-gas mixed burning heating furnace combustion air secondary pre-heating device according to claim 1, it is characterized in that: described air heat exchanger is that two metal pipe type heat exchangers are composed in series.
3. a kind of oil-gas mixed burning heating furnace combustion air secondary pre-heating device according to claim 2 is characterized in that: preceding 4 rows of described metal pipe type heat exchanger are the Cr25Ni20Si seamless steel pipe; 5～15 rows are 1Cr18Ni9Ti aluminising seamless steel pipe; 16-62 row is 20# aluminising seamless steel pipe.
4. according to claim 2 or 3 described a kind of oil-gas mixed burning heating furnace combustion air secondary pre-heating devices, it is characterized in that: described air secondary preheating heat exchanger suspension type is installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200686685U CN201062796Y (en) | 2007-04-05 | 2007-04-05 | Apparatus for secondary pre-heating combustion air for oil gas multifuel combustion heating furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200686685U CN201062796Y (en) | 2007-04-05 | 2007-04-05 | Apparatus for secondary pre-heating combustion air for oil gas multifuel combustion heating furnace |
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| Publication Number | Publication Date |
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| CN201062796Y true CN201062796Y (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007200686685U Expired - Fee Related CN201062796Y (en) | 2007-04-05 | 2007-04-05 | Apparatus for secondary pre-heating combustion air for oil gas multifuel combustion heating furnace |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103343977A (en) * | 2013-07-12 | 2013-10-09 | 山西太钢不锈钢股份有限公司 | Heat exchanger and manufacturing method thereof |
| CN103968696A (en) * | 2013-01-24 | 2014-08-06 | 宁波市镇海倍速达石化设备有限公司 | Tin-iron composite steel pipe |
| CN104677125A (en) * | 2015-02-12 | 2015-06-03 | 中山市迦南节能环保科技有限公司 | Heating gas aluminum melting furnace energy-saving combustion system |
| CN105021075A (en) * | 2015-05-26 | 2015-11-04 | 北京恩吉节能科技有限公司 | Dual-preheating rotation type heat-storage heat exchanger and combustion system |
-
2007
- 2007-04-05 CN CNU2007200686685U patent/CN201062796Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103968696A (en) * | 2013-01-24 | 2014-08-06 | 宁波市镇海倍速达石化设备有限公司 | Tin-iron composite steel pipe |
| CN103343977A (en) * | 2013-07-12 | 2013-10-09 | 山西太钢不锈钢股份有限公司 | Heat exchanger and manufacturing method thereof |
| CN103343977B (en) * | 2013-07-12 | 2015-09-23 | 山西太钢不锈钢股份有限公司 | Heat exchanger and preparation method thereof |
| CN104677125A (en) * | 2015-02-12 | 2015-06-03 | 中山市迦南节能环保科技有限公司 | Heating gas aluminum melting furnace energy-saving combustion system |
| CN104677125B (en) * | 2015-02-12 | 2018-04-13 | 中山市迦南节能环保科技有限公司 | Heating gas aluminium melting furnace energy-saving combustion system |
| CN105021075A (en) * | 2015-05-26 | 2015-11-04 | 北京恩吉节能科技有限公司 | Dual-preheating rotation type heat-storage heat exchanger and combustion system |
| CN105021075B (en) * | 2015-05-26 | 2018-12-07 | 北京恩吉节能科技有限公司 | It is double to preheat rotary regenerative heat exchanger and combustion system |
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| C14 | Grant of patent or utility model | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080521 Termination date: 20150405 |
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| EXPY | Termination of patent right or utility model |